CN116079865A - A rigid-flexible concrete prefabricated pile mold - Google Patents

Abstract

The invention provides a rigid-flexible connection type concrete precast pile mould, which comprises an upper mould and a lower mould which are used for mutually buckling to form an internal columnar cavity, wherein longitudinal tongue-and-groove rib plates are arranged at the mould clamping positions of the upper mould and the lower mould, the upper mould and the lower mould respectively comprise an outer mould and an inner mould which are mutually nested, the outer mould is a rigid mould, the inner mould is a flexible mould, more than two equally-spaced inner moulds are coaxially arranged in the outer mould, both ends of the inner mould are respectively provided with an outward-expanding inclined end face, the outer edges of the inclined end faces are attached to the inner side walls of the outer mould, the inclined end faces of the adjacent inner moulds and the inner side walls between the adjacent inner moulds form a semi-annular groove, the inner mould and the outer mould are fixedly connected through a semi-annular supporting structure, the semi-annular supporting structure and the inner mould are in clearance connection, when a pile body is compressed in the pile body after concrete hardening, the inner mould can follow the compression deformation of the pile body to generate trace elastic deformation, and the trace deformation is absorbed by a clearance part between the inner mould and the inner cavity, in particular a clearance between the matched semi-annular supporting structure and the inner mould.

Description

A rigid-flexible concrete prefabricated pile mold

technical field

The invention relates to the technical field of engineering construction, in particular to mold equipment technology, and also relates to a mold for rigid-flexible concrete prefabricated piles.

Background technique

In the field of concrete prefabricated pile construction, pretensioned prestressed concrete piles can withstand various external forces such as hammering and static pressure during the pile sinking process due to the high strength of the pile body concrete and certain precompression stress. Keep the pile intact. This type of pile is widely used all over the country because of its high single pile bearing capacity, high driving resistance, strong penetrating power, reliable quality, and relatively low cost per unit bearing capacity.

The main process of applying prestress in the manufacturing process of centrifugally formed pretensioned prestressed concrete piles is: weave prestressed steel bars into reinforcement cages and put them into steel molds, then put concrete into steel molds, and use steel molds as counter force devices Use hydraulic jacks to stretch the prestressed steel bars, and the applied tension is borne by the steel mold through the anchor plates fixed on both ends of the steel mold: after the shape of the pile is formed by centrifugal forming, steam curing is carried out to speed up the strength development of the concrete The prestressed steel bar and the concrete are combined into one body, and after the concrete strength reaches a certain requirement, the tension is carried out, and all the tension is transferred to the concrete of the pile body to bear.

Taking the pile length of 15 meters as an example during this stretching process, the length of the pile body will be compressed by about 1.5-4 mm according to the size of the concrete precompression stress of the pile body. Since the centrifugally formed pretensioned prestressed concrete non-special-shaped piles (such as pipe piles, square piles) have no special-shaped protrusions on the periphery, and the inner wall of the steel mold is in a smooth state, the pile body is separated from the inner wall of the steel mold after being compressed during tension. It will be evenly distributed in the pile body, and there will be no cracks in the pile body. But the smooth steel mold of this inner wall can't produce special-shaped pile, and the steel mold used during the production of centrifugally formed pretensioned prestressed concrete pile of the prior art is national building material industry standard JC/T605-2005 " pretensioned method prestressed concrete pipe The single-layer wall composition shown in Pile Steel Formwork. When this type of steel mold is used to produce prestressed concrete special-shaped piles, the protrusions on the pile body must form a concave shape on the inner wall of the steel mold to form. When the pile body is compressed during the stretching process, the pile body cannot follow the compression deformation of the pile body because the pile body is fixed on the concave part of the inner wall of the steel mold, and cracks will occur at the joint part of the pile body and the pile body protrusion, and even in serious cases. A raised drop occurs. Moreover, the pile body and the steel mold cannot be separated, which makes it difficult to demould the product.

If the rigidity of the steel mold is greatly reduced, the steel mold has greater deformation capacity, and the structure of the corresponding raised surface in the steel mold is adjusted accordingly, and the angle of the raised protrusion is increased to reduce the height of the raised protrusion, which can reduce the occurrence of cracks possibility. However, such a steel mold is difficult to bear the prestressed tension as a reaction force device because the rigidity is too low. Moreover, the steel mold is easily deformed in the manufacturing process of hoisting, centrifugation, maintenance and the like, which is difficult to meet the requirements of industrialized production. In addition, the raised part of the manufactured prestressed concrete special-shaped pile is too small, which limits the application range of the product.

In the prior art, there is also a design proposed for this situation, such as a combination of a core mold and an external upper and lower mold. In addition to setting a circumferential groove inside the upper and lower molds, a longitudinal groove must also be provided to prevent the pile body from collapsing. Requirements for cracks to be formed in the joint with the protrusion of the pile. Setting the longitudinal raised part on the pile body not only increases the difficulty of making the steel formwork and increases the cost, but also under some geological conditions, this part hinders the movement of soil void water, which is not conducive to improving the bearing capacity.

For example, the nesting solution of molds made of elastic materials and rigid materials is used to solve the inherent defects of special-shaped pile molds, but new problems will still be introduced, such as the complex structure of the inner mold, high cost of use, and the connection structure between the inner and outer molds. The technical requirements are high, and it is especially difficult to simultaneously support the concrete pile body and release the concrete through the elastic inner mold. It can be seen that within the scope of the prior art, it is difficult to solve the problem that the raised structure on the pile body is not firm, easy to fall off and easy to be damaged by optimizing the mold design.

To sum up, the molds used in the existing concrete pre-shaped piles have the technical problem that the processed prefabricated pile body is prone to cracks, especially the pile body is easily damaged due to the protrusion.

Contents of the invention

The technical problem to be solved by the present invention is that the molds used in the existing concrete pre-shaped piles are prone to cracks in the processed prefabricated pile body, especially the problem that the pile body is easily damaged due to the protrusion.

In order to solve the above problems, the present invention provides a rigid-flexible concrete prefabricated pile mold, including an upper mold and a lower mold for interlocking to form an inner columnar cavity, and a longitudinal The grooved rib plate, the upper mold and the lower mold both include an outer mold and an inner mold nested with each other, the outer mold is a rigid mold, the inner mold is a flexible mold, and the outer mold is coaxially provided with two More than two inner molds, adjacent to the inner mold are arranged at equal intervals in the axial direction, and both ends of the inner mold are provided with an outwardly expanded inclined end surface, and the outer edge of the inclined end surface is attached to the inner side wall of the outer mold, The inclined end surface of the adjacent inner mold and the inner wall of the outer mold between them form a semi-annular groove, and the inner mold and the outer mold are connected and fixed by a semi-annular support structure, and the semi-annular support The gap connection between the structure and the inner mold is used to reserve a deformation allowance for the inner mold and the concrete pile body during the forming process of the concrete special-shaped pile.

This kind of prestressed concrete special-shaped pile is combined with internal and external molds, and a rigid-elastic double-walled prefabricated pile mold is used. The outer mold has a larger rigidity, and the inner mold has a smaller rigidity and flexibility. The steel mold formed by the inner mold and the outer mold. The inner surface is compatible with the outer surface of the prestressed concrete special-shaped pile. The semi-annular groove formed by the interval between the inner mold and the outer mold is used to form the protrusion of the special-shaped pile. The gap between the semi-annular support structure and the inner mold is at When the prestressed concrete special-shaped pile is placed in tension, the inner mold follows the compression deformation of the pile body to ensure that the protrusion of the pile body is complete and free of cracks. Before the concrete is hardened during the molding process of the special-shaped pile body, the prestressed tension and tension applied are mainly from the outer mold. Due to the small rigidity of the inner mold, when the pile body is compressed during the relaxation process after the concrete is hardened, the inner mold can follow the compression deformation of the pile body and produce a small amount of elastic deformation. The gap between the cavities, especially the gap between the semi-annular support structure and the inner mold is absorbed, so as to ensure that the raised joint between the pile body and the pile body is not prone to cracks, and the pile body and the mold can be separated smoothly. The semi-annular groove on the mold corresponding to the protrusion of the pile body has a side wall formed by the inclined end surface of the inner mold, so the protrusion position can also adapt to the deformation of the pile body when it is stretched, avoiding the protrusion structure and the pile. The body is uneven and the connection position is easy to break. In addition, the elastic deformation of the inner mold of the mold during the concrete forming process is restored after the pile body is separated from the mold, and the mold can be used repeatedly.

Since the inner mold adopts a split structure, that is, multiple coaxial inner molds are connected, the mold part corresponding to the convex structure of the special-shaped pile body is a semi-circular concave formed by the inclined end surface of the adjacent inner mold and the inner surface of the outer mold. Groove, to avoid processing a complete groove structure on the same inner mold wall, or to form multiple groove structures on the same inner mold wall multiple times, and complete the raised part of the special-shaped pile body through the docking position of the inner mold This design is equivalent to optimizing the production and processing technology of the inner mold. The inner mold is composed of components with relatively short length and relatively simple structure. The molded components can be obtained by punching both ends of each inner mold. The inner mold forms a support connection with the outer mold through the semi-ring support structure, which constitutes the whole mold, and the processing is relatively easy, which reduces the production cost of the mold.

As a preferred solution, the semi-annular support structure is a rigid semi-annular liner, the semi-annular outer edge of the semi-annular liner is fixedly connected to the inner side wall of the outer mold, and the inner side of the semi-annular liner Both ends of the rim are fixedly connected to the outer sidewall of the inner mold, and a preset distance is maintained between the middle area of the inner edge of the semi-annular liner and the outer sidewall of the inner mold. Optimize the design and connection method of the semi-ring support structure, strengthen the connection between the outer mold and the inner mold, and improve the support of the outer mold to the inner mold.

As a preferred solution, the semi-annular liner is connected to the outer mold by welding or bolts, the two ends of the semi-annular liner are welded to the inner mold, and the inner mold of the semi-annular liner The distance between the central region of the rim and the outer side wall of the inner mold is in the range of 0.3mm-1.5mm. Adaptively adjust the gap between the semi-annular liner and the inner mold according to the deformation of the concrete pile forming process, and further optimize the fixed connection between the semi-annular liner and the inner and outer molds to enhance the implementability of the mold .

As a preferred solution, the inclined end surface of the inner mold is welded to the inner side of the outer mold, and the position of the welding seam connects the inclined end surface and the inner side wall of the outer mold through an inclined plane transition, and the two welds in the same semi-annular groove The spacing between the seams ranges from 40mm to 120mm. It is easy to securely connect the inner mold and the outer mold structure by welding, and the inclined transition surface is formed by using the welding seam structure, so that the surface of the groove structure is smoother.

As a preferred solution, the outer wall of the outer mold is provided with more than two axial ribs parallel to its axial direction, and the axial ribs are arranged at intervals along the radial direction of the outer mold, and the axial ribs Used to increase the rigidity of the outer mold. This design improves the rigidity of the outer mold and prevents the outer mold from being deformed under stress when the concrete pile is formed, especially during the lifting and centrifuging process.

As a preferred solution, anchoring plates are fixedly connected to the end surfaces at both ends of the outer mold, and reinforcing ribs are uniformly arranged between the anchoring plate and the outer wall of the outer mold. This structure ensures that before the concrete is hardened, the applied prestressed tensile force is mainly borne by the outer mold.

As a preferred solution, the outer mold includes more than two semi-cylindrical shells connected end to end, and the outer sidewalls of the semi-cylindrical shells are all fixedly connected with the axial ribs. By optimizing the design of the outer mold with this structure, the connecting components of the multiple semi-cylindrical shells are easy to form, connected and fixed by axial ribs, easy to process and sufficiently firm after connection.

As a preferred solution, the outer wall of the outer mold is provided with more than two semi-annular ribs along its radial direction, and the semi-annular ribs are all arranged at intervals along the axial direction of the outer mold. The strength of the outer mold in the circumferential direction is strengthened by the structure of the semi-ring rib plate, and the circumferential deformation of the mold during the molding process is avoided.

As a preferred solution, the angle formed between the inclined end surface of the inner mold and the side wall of the inner mold is greater than or equal to 110°, and the groove depth of the semi-circular groove ranges from 45mm to 150mm. The structural size limitation of the semi-annular groove ensures that the pile body is relatively easy to separate from the mold after forming, and the size and structure meet the technical requirements of special-shaped piles.

As a preferred solution, the thickness of the side wall of the inner mold ranges from 4 mm to 8 mm, the thickness of the side wall of the outer mold is greater than or equal to 7 mm, and the thickness of the axial rib is not more than 8 mm. Through this design, the elasticity and rigidity of the inner mold are relatively balanced, and the applicability of the mold is good. The wall thickness of the outer mold is limited to a minimum thickness to ensure sufficient rigidity, and the thickness of the axial ribs meets the process requirements.

Description of drawings

Fig. 1 is the side semi-sectional structure schematic diagram of a kind of rigid-flexible joint type concrete prefabricated pile mold provided by the present invention;

Fig. 2 is the local structure schematic diagram of the semi-annular groove position of the rigid-flexible concrete prefabricated pile mold in Fig. 1;

Fig. 3 is the schematic diagram of the cross-sectional structure of the rigid-flexible concrete prefabricated pile mold in Fig. 1;

Fig. 4 is the structural representation of the inner mold of the rigid-flexible concrete prefabricated pile mold in Fig. 1;

Fig. 5 is a structural schematic diagram of the inner mold of another rigid-flexible concrete prefabricated pile mold provided by the present invention.

Among them, in Figure 1-Figure 5:

1. Anchor plate; 2. Inclined end face; 3. Semi-circular groove; 4. Outer mold; 5. Inner mold; 6. Semi-circular liner; 9. Semi-ring ribs; 10. Upper die; 11. Lower die.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below, and obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

With reference to Fig. 1-Fig. 3, Fig. 1 is the side semi-sectional structure schematic diagram of a kind of rigid-flexible joint type concrete prefabricated pile mold provided by the present invention; Schematic diagram of the local structure of the groove position; Figure 3 is a schematic diagram of the cross-sectional structure of the rigid-flexible concrete prefabricated pile mold in Figure 1.

The rigid-flexible concrete prefabricated pile mold provided by the embodiment of the present invention includes an upper mold 10 and a lower mold 11 for interlocking to form an inner columnar cavity. The tongue and groove rib plate 7, the upper mold 10 and the lower mold 11 all include an outer mold 4 and an inner mold 5 nested with each other, the outer mold 4 is a rigid mold, the inner mold 5 is a flexible mold, and the outer mold 4 is coaxially provided with two More than two internal molds 5, the adjacent internal molds 5 are arranged at equal intervals along the axial direction, and the two ends of the internal mold 5 are all provided with outwardly expanded inclined end faces 2, and the outer edges of the inclined end faces 2 are attached to the inner side wall of the outer mold 4, adjacent to each other. The inclined end face 2 of the inner mold 5 and the inner side wall of the outer mold 4 between the two form a semi-annular groove 3, and the inner mold 5 and the outer mold 4 are connected and fixed by a semi-annular support structure, and the semi-annular support structure is connected with the outer mold 4. The gap connection between the inner molds 5 is used to reserve a deformation margin for the inner mold 5 and the concrete pile body to be stretched during the forming process of the concrete special-shaped pile.

The prestressed concrete special-shaped pile in this embodiment is combined with an inner and outer formwork, and a rigid-elastic double-wall prefabricated pile form is used. The outer formwork is relatively rigid, and the inner formwork is less rigid and has flexibility and elasticity. The inner formwork and the outer formwork are jointly formed. The inner surface of the steel mold is compatible with the outer surface of the prestressed concrete special-shaped pile. The semi-annular groove formed by the interval between the inner mold and the outer mold is used to form the protrusion of the special-shaped pile. The semi-annular support structure and the inner mold When the prestressed concrete special-shaped pile is stretched, the internal mold follows the pile body to compress and deform to ensure that the protrusion of the pile body is complete and free of cracks. Before the concrete is hardened during the forming process of the special-shaped pile body, the applied prestressed tensile force is mainly composed of Due to the small rigidity of the inner mold, when the pile body is compressed during the relaxation process after the concrete is hardened, the inner mold can follow the compression deformation of the pile body and produce a small amount of elastic deformation. The gap between the inner cavity of the outer mold, especially the gap between the semi-annular support structure and the inner mold is absorbed, so as to ensure that the raised joint between the pile body and the pile body is not prone to cracks, and the pile body and the mold can be smoothly Separation, because the semi-annular groove on the mold corresponding to the protrusion of the pile body has a side wall formed by the inclined end surface of the inner mold, so the raised position can also be adaptively deformed with the pile body when it is stretched, avoiding the protrusion The structure and the pile body are uneven, and the connection position is easy to break. In addition, the elastic deformation of the inner mold of the mold during the concrete forming process is restored after the pile body is separated from the mold, and the mold can be used repeatedly.

With reference to Fig. 4, Fig. 5, Fig. 4 is the structural representation of the inner mold of the rigid-flexible concrete prefabricated pile mold in Fig. 1; Fig. 5 is the inner mold of another kind of rigid-flexible concrete prefabricated pile mold provided by the present invention Schematic.

Adaptively adjust the structure of the inner mold and outer mold according to the structure of the concrete special-shaped pile that needs to be formed. When the pile body is required to be a cylinder, the inner mold also adopts a semi-cylindrical hollow structure. Correspondingly, when the pile body to be formed is a polygonal cylinder, The inner mold has a semi-polygonal cylindrical structure. For example, when forming a quadrangular prism pile, the inner molds in the upper and lower molds that are connected to each other can be split along the rectangular diagonal of the pile cross-section.

Since the inner mold adopts a split structure, that is, multiple coaxial inner molds are connected, the mold part corresponding to the convex structure of the special-shaped pile body is a semi-circular concave formed by the inclined end surface of the adjacent inner mold and the inner surface of the outer mold. Groove, to avoid processing a complete groove structure on the same inner mold wall, or to form multiple groove structures on the same inner mold wall multiple times, and complete the raised part of the special-shaped pile body through the docking position of the inner mold This design is equivalent to optimizing the production and processing technology of the inner mold. The inner mold is composed of components with a relatively short length and a relatively simple structure. The molded components can be obtained by punching both ends of each inner mold, and the assembly line operation Standardized production, and a plurality of inner molds form a supporting connection between the semi-ring support structure and the outer mold to form a whole mold, and the processing is relatively easy, which greatly improves the production and processing efficiency of the mold and reduces the production cost of the mold.

On the basis of the above embodiments, in order to further optimize the semi-annular support structure and its connection with the inner and outer molds: the semi-annular support structure is a rigid semi-annular liner 6, and the semi-annular outer edge of the semi-annular liner 6 The inner side wall of the fit outer mold 4 is fixedly connected, the two ends of the inner edge of the semi-annular liner 6 are fixedly connected with the outer side wall of the inner mold 5, and the middle area of the inner edge of the semi-annular liner 6 is connected with the outer side wall of the inner mold 5. maintain a preset distance between them.

In the technical solution provided in this embodiment, the semi-annular support structure specifically adopts a rigid plate structure, which has a good installation and fixing effect, and strengthens the connection between the inner mold and the outer mold, and can effectively transfer the stress in the forming of the pile body to the outer mold , the bearing is realized through the rigidity of the outer mold, and the circumferential rigidity of the outer mold can be further improved. The two ends of the semi-annular liner are fixed with the inner mold to ensure the connection and fixation of the structure. At the same time, a certain gap is reserved in the middle area. When the pile body is deformed during the concrete forming process, the inner mold can deform along with the adaptability of the concrete surface, which can absorb the stress on the raised part due to the shrinkage of the concrete prefabricated pile when it is stretched, and avoid cracking due to uneven stress between the raised part and the pile body The phenomenon.

On the basis of the above embodiments, further optimize the fixed connection mode between the semi-annular liner and the inner and outer molds, and the specific reserved gap range: the semi-annular liner 6 and the outer mold 4 are connected by welding or bolts, the semi-annular Both ends of the liner 6 are welded to the inner mold 5, and the distance between the middle area of the inner edge of the semi-annular liner 6 and the outer sidewall of the inner mold 5 is 0.3mm-1.5mm.

In this embodiment, according to the deformation of the concrete pile forming process, the gap between the semi-annular liner and the inner mold is adaptively adjusted to 0.3mm-1.5mm, which can resist the excessive deformation of the inner mold and prevent the prefabricated pile from being damaged. body size deviation; and further optimize the fixed connection between the semi-annular liner and the inner and outer molds. The welding and threaded connections are easy to implement, and the fixing effect is good, which enhances the implementability of the mold.

In the technical solution provided in this embodiment, the inclined end surface 2 of the inner mold 5 is welded to the inner surface of the outer mold 4, and the position of the weld seam is connected to the inclined end surface 2 and the inner side wall of the outer mold 4 through an inclined plane transition, and the same semi-circular groove The distance between the two welds in 3 ranges from 40mm to 120mm. It is easy to connect the structure of the inner mold and the outer mold by welding, and the inclined transition surface is formed by using the weld structure, so that the surface of the groove structure is smoother; by adjusting the distance between the welds in the same semi-circular groove The scope is limited, and the width of the raised structure on the formed concrete pile is controlled to meet the requirements of the construction standard.

In the technical solution provided in this embodiment, the outer wall of the outer mold 4 is provided with more than two axial ribs 8 parallel to its axial direction, and the axial ribs 8 are arranged at intervals along the radial direction of the outer mold 4. The ribs 8 are used to improve the rigidity of the outer mold 4 . This design improves the rigidity of the outer formwork so as to resist the load under complex working conditions such as centrifugal and hoisting of the outer formwork during pile forming, and improves the concentricity of the special-shaped concrete prefabricated piles.

The technical solution provided in this embodiment is mainly to optimize the connection between the moulds. The end faces of the two ends of the outer mold 4 are fixedly connected with anchor plates 1 , and reinforcing ribs are uniformly arranged between the anchor plate 1 and the outer wall of the outer mold 4 . This structure ensures that before the concrete is hardened, the applied prestressed tensile force is mainly borne by the outer mold.

On the basis of the above embodiments, the outer mold also adopts a split splicing structure: the outer mold 4 includes more than two semi-cylindrical shells connected end to end, and the outer sidewalls of the semi-cylindrical shells are fixedly connected with the axial ribs 8 . By optimizing the design of the outer mold with this structure, it is easy to form the connecting members of the multiple semi-cylindrical shells, and the multiple semi-cylindrical shells are connected end-to-end and fixed through the axial rib connection, which is easy to process and sufficiently firm after connection.

Similar to the principle of setting axial ribs in the above-mentioned embodiments, this embodiment sets semi-annular ribs: the outer wall of the outer mold 4 is provided with more than two semi-annular ribs 9 along its radial direction, and the semi-annular ribs The plates 9 are arranged at intervals along the axial direction of the outer mold 4 . The strength of the outer mold in the circumferential direction is strengthened by the structure of the semi-circular rib plate, which avoids the circumferential deformation of the mold during the forming process, and can also improve the coaxiality of the pile itself after forming.

The technical solution provided by this embodiment further optimizes the structure of the semi-annular groove. The angle formed between the inclined end surface 2 of the inner mold 5 and the side wall of the inner mold 5 is greater than or equal to 110°, and the semi-annular groove 3 The groove depth range is 45mm-150mm.

When the angle between the inclined end surface of the inner mold and the side wall of the inner mold is less than 110°, stress concentration is likely to occur at the joint between the pile body and the pile body protrusion during the tensioning process, and the raised part of the pile body is easily damaged after forming, and there is no guarantee The pile body is separated from the mold smoothly. When the maximum depth of the semi-annular groove is less than 45mm, the centrifugally formed pretensioned prestressed concrete special-shaped pile loses its engineering application significance. When the maximum depth of the semi-annular groove is greater than 150mm, excessive deformation occurs due to the oblique end surface of the inner mold following the compression deformation of the pile body, exceeding the elastic deformation range of the mold steel, making it difficult to recover the deformation, and the steel mold cannot be guaranteed of repeated use. The structural size limitation of the semi-annular groove ensures that the pile body is relatively easy to separate from the mold after forming, and the size and structure meet the technical requirements of special-shaped piles.

The technical scheme in this embodiment optimizes the thickness range of each part in the mould. The side wall thickness range of the inner mold 5 is 4mm-8mm, the side wall thickness of the outer mold 4 is greater than or equal to 7mm, and the thickness of the axial rib 8 is no more than 8mm.

The thickness of the wall body of the inner mold is not more than 10mm, and the optimum thickness of the further inner mold based on this embodiment is 5mm to 6mm. When the thickness is greater than 8mm, the rigidity of the inner mold is too large, and it is difficult to produce a small amount of elastic deformation, and the raised part of the pile body cannot be separated from the side wall of the inner mold, and cracks will appear at the joint between the formed pile body and the raised pile body. And the thickness is too thick will cause material waste. However, when the thickness of the inner mold is too thin and less than 4mm, the mold is easily deformed during the lifting, centrifuging and other product manufacturing processes, resulting in deformation of the formed pile body and cracks in the pile body. During the stretching process, due to the large deformation of the inner mold, it is easy to generate stress concentration at the joint between the pile body and the pile body protrusion, which makes it difficult to separate the pile body from the mold. Similarly, the thickness range of the outer mold and axial ribs is mainly to ensure the rigidity of the mold structure and prevent abnormal deformation.

Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims (10)

1. The utility model provides a just, gentle even formula concrete precast pile mould, includes last mould (10) and lower mould (11) that are used for mutual lock to form inside columnar cavity, its characterized in that, go up mould (10) and lower mould (11) compound die department and be provided with vertical tongue-and-groove gusset (7), go up mould (10) and lower mould (11) all including external mould (4) and centre form (5) nested each other, external mould (4) are the rigid mould, centre form (5) are the flexible mould, be provided with more than two centre forms (5) in mould (4) on the same axle, adjacent centre form (5) are along axial equidistant setting, the both ends of centre form (5) all set up oblique terminal surface (2) that expand outward, oblique terminal surface (2) outer fringe laminating outside mould (4) the inside wall, adjacent oblique terminal surface (2) of centre form half annular groove (3) with external mould (4) inside wall between the two, be connected fixedly through half annular bearing structure between centre form (5) and the external mould (4), centre form bearing structure and the clearance is used for the special-shaped pile deformation in the pile shaping process along with the concrete pile.

2. The rigid-flexible concrete precast pile mold according to claim 1, wherein the semi-annular supporting structure is a rigid semi-annular lining plate (6), the semi-annular outer edge of the semi-annular lining plate (6) is attached to the inner side wall of the outer mold (4) and fixedly connected, two ends of the inner edge of the semi-annular lining plate (6) are fixedly connected with the outer side wall of the inner mold (5), and a preset distance is kept between the middle area of the inner edge of the semi-annular lining plate (6) and the outer side wall of the inner mold (5).

3. The rigid-flexible concrete precast pile die according to claim 2, wherein the semi-annular lining plate (6) is connected with the outer die (4) through welding or bolts, two ends of the semi-annular lining plate (6) are connected with the inner die (5) through welding, and the interval range between the middle area of the inner edge of the semi-annular lining plate (6) and the outer side wall of the inner die (5) is 0.3mm-1.5mm.

4. A rigid-flexible concrete precast pile mould as claimed in claim 3, wherein the inclined end face (2) of the inner mould (5) is welded with the inner side face of the outer mould (4), the welding seam position is connected with the inclined end face (2) and the inner side wall of the outer mould (4) through inclined transition, and the distance between two welding seams in the same semi-annular groove (3) is 40mm-120mm.

5. A rigid-flexible concrete precast pile mould as claimed in any one of claims 1 to 4, wherein the outer side wall of the outer mould (4) is provided with more than two axial rib plates (8) parallel to the axial direction of the outer mould, the axial rib plates (8) are all arranged at intervals along the radial direction of the outer mould (4), and the axial rib plates (8) are used for improving the rigidity of the outer mould (4).

6. The rigid-flexible concrete precast pile mold according to claim 5, wherein end surfaces at two ends of the outer mold (4) are fixedly connected with anchor plates (1), and reinforcing ribs are uniformly arranged between the anchor plates (1) and the outer side walls of the outer mold (4).

7. The rigid-flexible concrete precast pile die as claimed in claim 5, wherein the outer die (4) comprises more than two half cylinder shells connected end to end, and the outer side walls of the half cylinder shells are fixedly connected with the axial rib plates (8).

8. The rigid-flexible concrete precast pile mold as claimed in claim 5, wherein the outer side wall of the outer mold (4) is radially provided with more than two semi-annular rib plates (9), and the semi-annular rib plates (9) are axially arranged at intervals along the outer mold (4).

9. The rigid-flexible concrete precast pile die as claimed in claim 5, wherein an included angle formed between the inclined end face (2) of the inner die (5) and the side wall of the inner die (5) is greater than or equal to 110 degrees, and the depth range of the semi-annular groove (3) is 45mm-150mm.

10. The rigid-flexible concrete precast pile mold as recited in claim 5, wherein the thickness of the side wall of the inner mold (5) ranges from 4mm to 8mm, the thickness of the side wall of the outer mold (4) is greater than or equal to 7mm, and the thickness of the axial rib plate (8) is not more than 8mm.

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