CN116146262A - A grouting type constant resistance - Google Patents

Abstract

The invention belongs to the technical field of anchoring support of geotechnical engineering, and particularly relates to a grouting type constant-resistance device. The constant resistor includes: the constant-resistance sleeve is used for being fixed at the hole position of the drilling hole and used as a mounting base of the constant-resistance device; the constant-resistance base is assembled in the constant-resistance sleeve in a sliding way with constant resistance, and a through hole is formed in the constant-resistance base and is used for the anchor rod or the anchor cable to pass through; the grouting pipe is communicated with the through hole on the constant-resistance base, and the anchor rod or the anchor cable penetrates through the grouting pipe to extend into the drill hole after penetrating through the through hole on the constant-resistance base; grouting liquid is injected into the drilled hole from a gap between the grouting pipe and the anchor rod or the anchor cable. The grouting type constant-resistance device is matched with the constant-resistance sleeve through the constant-resistance base capable of realizing the grouting function and the constant-resistance sliding function, so that the deformation of the grouting type constant-resistance device can increase the deformation of an anchor rod (rope), and the technical problem that the existing anchor rod (rope) is low in elongation rate and difficult to adapt to the large deformation of surrounding rock is solved, and the grouting type constant-resistance device is popularized and used.

Description

A grouting type constant resistance

technical field

The invention belongs to the technical field of anchoring and supporting in geotechnical engineering, and in particular relates to a grouting type constant resistance device.

Background technique

At present, the existing problems in coal mines are the blasting and drilling construction of coal mine roadways, coal mine roadway support and roof protection in coal mine roadway excavation. These three points are the most likely to cause safety production accidents in coal mine roadway excavation, and they are also the main causes of unsafe production. factor.

Common roof supports in the coal mining process include bolt support, mine support steel and scalable support. Generally, the bearing capacity of metal is mainly manifested in two aspects, one is the ultimate bearing capacity, and the other is actual carrying capacity. There are also many safety issues of the roof during coal mine excavation. The first is the geological structure and its influence. If the stability of the surrounding rock is extremely poor, large deformations will occur during the construction of the coal mine, which will cause the support to remain intact after repeated repairs. Not up to the standard it should be.

Secondly, the top layer lacks a reasonable fixed structure. If the roadway encounters water, it may cause deformation of the surrounding rock, and even separation of the surrounding rock, which increases the difficulty of roof support. At present, in the process of coal mining in my country, drilling and blasting are mainly used for construction. However, in the actual construction process, there are still many problems in the use of conventional bolt support. For some relatively dense underground places, when the roadway is excavated, the balance of the rock mass will be destroyed, which will cause large-scale collapse. .

Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies in the prior art.

Contents of the invention

The object of the present invention is to provide a grouting type varistor to at least solve the above-mentioned problems in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

A grouting type constant resistance device, said constant resistance device comprising:

A constant resistance casing, the constant resistance casing is used to be fixed at the hole position of the borehole, as the installation basis of the constant resistance device;

A constant resistance base, the constant resistance base is slidably assembled in the constant resistance casing with constant resistance, and a through hole is provided in the constant resistance base, and the through hole is used for the anchor rod or the anchor cable to pass through;

Grouting pipe, the grouting pipe communicates with the through hole on the constant resistance base, after the anchor rod or anchor cable passes through the through hole on the constant resistance base, it passes through the grouting pipe and extends into the borehole; The liquid is injected into the borehole from the gap between the grouting pipe and the anchor rod or anchor cable.

For the above-mentioned grouting type constant resistance device, preferably, the outer peripheral surface of the constant resistance base is provided with a grouting hole, the grouting hole communicates with the through hole, and the grouting hole is used to connect with the grouting device , the grouting fluid enters the borehole from the grouting hole.

In the above-mentioned grouting type constant resistance device, preferably, the grouting hole is perpendicular to the through hole; when the constant resistance base is installed on the constant resistance casing, the grouting hole on the constant resistance base is located at the constant resistance casing outside.

In the above-mentioned grouting type constant resistance device, preferably, the constant resistance base is a hollow truncated cone structure, and the diameter of the constant resistance base gradually increases from one end inserted into the constant resistance sleeve to the other end.

As for the above-mentioned grouting type constant resistance device, preferably, the grouting pipe is transitionally connected with the small end of the constant resistance base.

As for the above-mentioned grouting type constant resistance device, preferably, the said constant resistance device also includes a sealing limit ring, and the sealing limit is also arranged inside the constant resistance casing, and when the grouting pipe is inserted into the constant resistance casing , the grouting pipe passes through the sealing limiting ring so that the sealing limiting ring is at the periphery of the grouting pipe.

As for the above-mentioned grouting type constant resistance device, preferably, the grouting pipe is covered with a grout stop sleeve, and when the grouting pipe is inserted into the sealing stop ring, the grout stop sleeve and the seal stop ring stop contact with each other .

As for the grouting type varistor mentioned above, preferably, a limiting member is fixed on the outer wall of the grouting pipe, and the limiting member is located upstream of the grout stop sleeve; The slurry sleeve is pressed tightly on the sealing limit ring.

For the above-mentioned grouting type constant resistance device, preferably, the said constant resistance device further includes a lock and a sealing ring, and the sealing ring is arranged between the lock device and the constant resistance base;

After the anchor rod or anchor cable is inserted into the constant resistance device, the lock is locked on the end of the anchor rod or anchor cable, and the lock will press the sealing ring on the constant resistance base to realize the constant resistance base and the anchor rod or anchor cable. seal between.

As for the above-mentioned grouting type constant resistance device, preferably, the said constant resistance device further includes a tray alignment seat and an alignment seat steel plate sheathed on the periphery of the constant resistance casing;

Any cross-section of the tray centering seat is conical, and the end of the tray centering seat with a larger taper abuts against the steel plate of the tray centering seat.

Beneficial effect:

The grouting type constant resistance device is an effective anchoring support method for roadway bolts (cables). Due to the strengthening effect on the strength of the surrounding rock of the roadway, it can significantly improve the stability of the surrounding rock, fast anchoring speed of the roadway, and improve The utilization rate of the roadway section, the simplification of the maintenance process at the end of the mining face, and the obvious improvement of the working environment and safety production conditions can improve the economic benefits of the mine, so it has become a main anchor (anchor cable) grouting anchorage in the mine roadway of coal mining enterprises. Support forms, mainly in tunnel support, surrounding rock surface anchoring, slope surface anchoring, coal mine roadway, semi-coal roadway support and various underground engineering support, deep foundation pit anchorage, and other roadway support technologies The main direction of development. It can get very good support effect for the recovery roadway of soft rock with large deformation and large plastic roadway.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. in:

Fig. 1 is a schematic structural diagram of a grouting type constant resistance device of the present invention.

In the figure: 1. Constant resistance casing; 2. Sealing limit ring; 3. Grout stopper; 4. Limiting piece; 5. Grouting pipe; 6. Tray centering seat; , Constant resistance base; 9, sealing ring; 10, slurry inlet hole; 11, lock.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientations or positional relationships indicated by "top", "bottom", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, so they cannot be understood as Limitations on the Invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, for example, it can be fixedly connected or detachably connected; it can be directly connected or indirectly connected through intermediate parts, for ordinary A skilled person can understand the specific meanings of the above terms according to specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

According to a specific embodiment of the present invention, as shown in Figure 1, the present invention provides a grouting type constant resistance device, the constant resistance device includes:

The constant resistance casing 1, the constant resistance casing 1 is used to be fixed at the hole position of the drill hole, as the installation basis of the constant resistance device; in this embodiment, the constant resistance casing 1 is made of corrugated steel pipe, and the corrugated steel pipe The corrugated structure serves as a constant resistance structure matched with the constant resistance base 8 .

The constant resistance base 8 is slidably assembled in the constant resistance sleeve 1 with constant resistance, and a through hole is provided in the constant resistance base 8 for the anchor rod or anchor cable to pass through.

Grouting pipe 5, the grouting pipe 5 communicates with the through hole on the constant resistance base 8, after the anchor rod or anchor cable passes through the through hole on the constant resistance base 8, it passes through the grouting pipe 5 and extends into the borehole ; The grouting fluid is injected into the borehole from the gap between the grouting pipe 5 and the anchor rod or the anchor cable.

In the constant resistance device, the grouting pipe 5 connected with the through hole of the constant resistance base 8 is set to realize the function of grouting in the borehole of the constant resistance anchor rod or anchor cable, so that the anchor rod or anchor cable can play a role The role of full-length grouting and anchoring, and through grouting, the broken and cracked surrounding rock mass can be formed into a new stable overall surrounding rock, so that the entire support surface forms an integral structure, which greatly improves the support of anchor rods or anchor cables. Effectiveness; at the same time, the grouting fluid enters the borehole through the gap between the grouting pipe 5 and the anchor rod or anchor cable, which makes the grouting fluid not affect the constant resistance assembly of the constant resistance base 8 and the constant resistance casing 1, It ensures that the anchor rod or anchor cable can slide with constant resistance in the constant resistance casing 1 through the constant resistance base 8, thereby increasing the deformation of the anchor rod or anchor cable, so that the anchor rod or anchor cable can more perfectly adapt to the surrounding rock In the case of large deformation, the supporting capacity of the anchor rod or anchor cable is improved.

A grouting hole 10 is arranged on the outer peripheral surface of the constant resistance base 8, and the grouting hole 10 communicates with the through hole. The grout inlet hole 10 is arranged on the constant resistance base 8, which facilitates the grouting operation and makes the structure of the constant resistance device more compact.

The slurry inlet hole 10 is perpendicular to the through hole; when the constant resistance base 8 is installed on the constant resistance casing 1 , the slurry inlet 10 on the constant resistance base 8 is located outside the constant resistance casing 1 . The grouting liquid enters the grouting hole 10 on the outer peripheral surface of the constant resistance base 8 and enters the port, and enters the through hole of the constant resistance base 8 after a 90-degree turn. In this process, the grouting liquid is further stirred, which also Make the grouting liquid be stirred more evenly.

The constant resistance base 8 is a hollow truncated cone structure, and the diameter of the constant resistance base 8 gradually increases from one end inserted into the constant resistance sleeve 1 to the other end. In this embodiment, the constant resistance base 8 is a truncated conical structure; under the action of the surrounding rock deformation, the constant resistance base 8 gradually enters the constant resistance casing 1 along with the anchor rod or anchor cable, which also makes the constant resistance base 8 The resistance between them and the constant resistance bushing 1 gradually increases, and when the constant resistance base 8 completely enters the constant resistance bushing 1, the two reach the maximum constant resistance.

The grouting pipe 5 is transitionally connected with the small end of the constant resistance base 8 . In this embodiment, the grouting pipe 5 and the constant resistance base 8 are of an integrated structure to ensure that the grouting pipe 5 and the constant resistance base 8 have better connection strength and structural strength; in other embodiments, the grouting pipe 5 and the The constant resistance base 8 is a split structure, and the grouting pipe 5 is threadedly connected to the constant resistance base 8, which is convenient for the disassembly and assembly of the constant resistance device and the replacement of parts.

The constant resistance device also includes a sealing limit ring 2, and the sealing limit is also arranged inside the constant resistance casing 1. When the grouting pipe 5 is inserted into the constant resistance casing 1, the grouting pipe 5 passes through the sealing limit ring 2, So that the sealing limit ring 2 is on the periphery of the grouting pipe 5 . The sealing limit ring 2 is set to play two functions. First, the sealing limit ring 2 seals the gap between the grouting pipe 5 and the constant resistance casing 1 to prevent the grouting liquid from entering the constant resistance In the bushing 1, so as to ensure the effectiveness of the constant resistance structure in the constant resistance bushing 1; second, the sealing limit ring 2 is set at a position far away from the inlet end of the constant resistance bushing 1, when the constant resistance base 8 slides to the constant resistance When the resistance sleeve 1 is away from the inlet end, the sealing limit ring 2 limits the constant resistance base 8 to prevent the constant resistance base 8 from breaking out of the constant resistance sleeve 1, thereby ensuring the effectiveness of the entire anchor rod or anchor cable support.

The grouting pipe 5 is covered with a grout stopper 3, and when the grouting pipe 5 is inserted into the sealing stop ring 2, the grout stopper 3 and the seal stopper ring 2 stop and contact each other. The grout stopper 3 abuts against and cooperates with the sealing limit ring 2, so as to play the role of double sealing.

A limiting member 4 is fixed on the outer wall of the grouting pipe 5 , and the limiting member 4 is located upstream of the grout stop sleeve 3 ; When the anchor rod or anchor cable drives the constant resistance base 8 to perform constant resistance movement in the constant resistance casing 1, the connection between the stopper 4 and the grouting pipe 5 is destroyed by a huge external force, ensuring that the constant resistance base 8 and the The constant-resistance sleeve 1 can stably perform constant-resistance relative motion. In this embodiment, the limiting member 4 is ring-shaped, and the annular section of the limiting member 4 is larger than the annular section of the grout stop sleeve 3. Such setting can make the grout stop sleeve 3 be more uniformly compressed, thereby achieving a better anti-spray effect. The sealing effect between the slurry pipe 5 and the constant resistance casing 1. In other embodiments, the limiting member 4 may be a stopper arranged in the axial direction of the grouting pipe 5, which is convenient for making and obtaining materials.

The constant resistance device also includes a lock 11 and a sealing ring 9, and the sealing ring 9 is arranged between the lock device 11 and the constant resistance base 8; after the anchor rod or the anchor cable is inserted into the constant resistance device, the lock device 11 is locked on the anchor rod or the anchor cable. end, and the lock 11 presses the sealing ring 9 on the constant resistance base 8 to realize the sealing between the constant resistance base 8 and the anchor rod or anchor cable.

In this embodiment, any cross-section of the sealing ring 9 is a tapered structure, so that it is more convenient to be used in the annular gap between the anchor rod or anchor cable and the constant resistance base 8, and the sealing ring 9 of the tapered structure is in the Under the compression effect of the lockset 11, the larger the compression, the better the sealing effect.

The constant resistance device also includes a tray alignment seat 6 and an alignment seat steel plate 7 set on the periphery of the constant resistance casing 1; any cross section of the tray alignment seat 6 is conical, and the tray alignment seat 6 has a larger cone shape. One end leans against the steel plate 7 of the centering seat. The tray centering seat 6 is set in a tapered structure, so that the constant resistance bushing 1 can be adaptively installed in the drilled hole, ensuring that the constant resistance bushing 1 is more evenly stressed.

The usage principle of the grouting type constant resistance device of the present application is that the grouting type constant resistance device and the anchor rod (cable) are matched for roadway support, and the grouting type constant resistance device and the anchor rod (cable) together form a complete The supporting body, the supporting body can be stretched and deformed under the condition of constant resistance, which can fully meet the requirements of the large deformation of the surrounding rock on the extension of the supporting rod body, and solve the problem that the traditional anchor (cable) support technology cannot adapt to the surrounding rock The problem of support failure caused by nonlinear large deformation failure characteristics.

In order to adapt to the large deformation of the surrounding rock and maintain a constant working resistance by stretching its length. In static state, the constant resistance device is tightly fitted on the aligning grouting device. When the axial tension on the anchor rod (anchor cable) is less than the static friction between the constant resistance casing 1 and the constant resistance base 8, the constant resistance The resistance sleeve 1 and the constant resistance base 8 are in a relatively static state; when the axial tension on the anchor rod (anchor cable) is greater than the static friction between the constant resistance sleeve 1 and the constant resistance base 8, the constant resistance sleeve 1 There will be a relative displacement between the constant resistance base 8, and at the same time, the constant resistance sleeve 1 undergoes a small elastic deformation in the form of radial expansion to facilitate the relative displacement. During the relative displacement, the constant resistance sleeve 1 and the The constant resistance base 8 still maintains a constant working resistance. After the energy is released, the surrounding rock tends to be new and stable, and the external force of the support gradually decreases. When the external axial tension decreases to the constant resistance value, the two will The relative displacement no longer occurs and the static state is reached again.

The constant resistance sleeve 1 returns to its original state from slight elastic deformation and is tightly fitted on the constant resistance base 8 again. After the surrounding rock undergoes large deformation, its energy is released. When the deformation energy of the surrounding rock is less than the constant resistance set by the constant resistance large deformation bolt, when the constant resistance casing 1 returns to its original shape and is tightly fitted on the rod body, the roadway The surrounding rock will become stable again, eliminating safety hazards such as roof fall and landslides.

When using this constant resistance:

Insert the constant resistance casing 1 into the borehole, then insert the connected constant resistance base 8 and the grouting pipe 5 into the constant resistance casing 1, the grouting pipe 5 is covered with a grout stopper 3, and pass The stopper 4 presses the grout stopper 3 onto the seal stop ring 2 inside the constant resistance casing 1 to prevent the grouting liquid from entering the grouting casing. When the constant resistance base 8 is installed, the The slurry inlet 10 stays outside the constant resistance casing 1 . Then the anchor rod or anchor cable passes through the through hole in the constant resistance base 8 and the grouting pipe 5, and stretches into the inside of the borehole; then fasten the anchor rod or anchor cable end with the lock 11, and the lock 11 will seal 9 is pressed on the constant resistance base 8, and the lock 11 fastens the anchor rod or anchor cable to the required torque, and at the same time ensures that the grouting hole 10 on the constant resistance base 8 remains outside the constant resistance casing 1; the grouting pump The grouting nozzle is communicated with the grouting hole 10 on the constant resistance base 8 for grouting until the grouting reaches a certain pressure before stopping the grouting. Play a full-length grouting anchor to meet the anchoring requirements of the design. Moreover, it can make the entire supporting surface form an integral structure; it is convenient for fully-mechanized mining operation, conducive to production safety, and improves production efficiency.

In summary, in the technical solution of the grouting type constant resistance device provided by the present invention, the grouting type constant resistance device is mainly used for roadway support, and is used in conjunction with the anchor rod (anchor cable). The constant-resistance base with constant-resistance sliding function cooperates with the constant-resistance casing, so that its own deformation can increase the deformation of the anchor (anchor cable), which solves the problem that the existing anchor (anchor cable) has a low elongation rate and is difficult to adapt to the surrounding environment. The technical problem of large deformation of rock has been widely used.

In addition, the use of grouting constant resistance can form a bolt (anchor cable) support system, which can not only release the concentrated stress in geotechnical engineering through the large deformation of the grouting constant resistance, but also make the bolt reinforced by grouting at the right time. The (anchor cable) support system has a stable anchoring base point and forms a new stable overall surrounding rock mass from the broken and cracked surrounding rock mass, which is better used in coal mine underground roadway support, semi-coal rock roadway support, rock burst mines, and tunnels Support, dam body support, culvert support or slope anchor support, various underground engineering support, deep foundation pit anchorage, and other geotechnical engineering support.

It can be understood that, the above description is only exemplary, and this embodiment of the present application does not limit it.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of the pending rights of the present invention. within the scope of protection.

Claims (10)

1. A grouting type constant resistance device, characterized in that, said constant resistance device comprises: A constant resistance casing, the constant resistance casing is used to be fixed at the hole position of the borehole, as the installation basis of the constant resistance device; A constant resistance base, the constant resistance base is slidably assembled in the constant resistance casing with constant resistance, and a through hole is provided in the constant resistance base, and the through hole is used for the anchor rod or the anchor cable to pass through; Grouting pipe, the grouting pipe communicates with the through hole on the constant resistance base, after the anchor rod or anchor cable passes through the through hole on the constant resistance base, it passes through the grouting pipe and extends into the borehole; The liquid is injected into the borehole from the gap between the grouting pipe and the anchor rod or anchor cable. 2. The grouting type constant resistance device according to claim 1, characterized in that, the outer peripheral surface of the constant resistance base is provided with a grouting hole, and the grouting hole communicates with the through hole, and the grouting hole is used for In connection with the grouting device, the grouting fluid enters the borehole from the grouting hole. 3. The grouting type constant resistance device according to claim 2, characterized in that, the grout inlet hole is perpendicular to the through hole; when the constant resistance base is installed on the constant resistance casing, the The slurry inlet is located outside the constant resistance casing. 4. The grouting type constant resistance device according to claim 1, characterized in that, the constant resistance base is a hollow truncated conical structure, and the diameter of the constant resistance base gradually changes from one end inserted into the constant resistance casing to the other end. big. 5. The grouting type constant resistance device according to claim 4, characterized in that the grouting pipe is transitionally connected to the small end of the constant resistance base. 6. The grouting type resistance constant according to claim 1, characterized in that, the resistance constant also includes a sealing limit ring, and the sealing limit is also arranged inside the constant resistance casing, and the grouting pipe When inserted into the constant resistance casing, the grouting pipe passes through the sealing limiting ring, so that the sealing limiting ring is at the periphery of the grouting pipe. 7. The grouting type constant resistance device according to claim 6, characterized in that, the grouting pipe is covered with a grout stopper, and when the grouting pipe is inserted into the sealing limit ring, the grout stopper and the sealing limiter The bit rings block contact with each other. 8. The grouting type constant resistance device according to claim 7, characterized in that, a limiting member is fixed on the outer wall of the grouting pipe, and the limiting member is located upstream of the grout stop sleeve; The position piece is used to press the grout stop sleeve tightly on the sealing limit ring. 9. The grouting type constant resistance device according to any one of claims 1-8, characterized in that, the said constant resistance device further comprises a lock and a sealing ring, and the sealing ring is arranged between the lock and the constant resistance base; After the anchor rod or anchor cable is inserted into the constant resistance device, the lock is locked on the end of the anchor rod or anchor cable, and the lock will press the sealing ring on the constant resistance base to realize the constant resistance base and the anchor rod or anchor cable. seal between. 10. The grouting type constant resistance device according to any one of claims 1-8, characterized in that the resistance constant device also includes a tray centering seat and a centering seat steel plate sheathed on the periphery of the constant resistance casing; Any cross-section of the tray centering seat is conical, and the end of the tray centering seat with a larger taper abuts against the steel plate of the tray centering seat.

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