WO2012003744A1 - Tubular product with outer corrugated type plastic winding structural walls reinforced with internal ribs and the manufaturing method thereof - Google Patents

Abstract

A tubular product with outer corrugated type plastic winding structural walls reinforced with internal-ribs and the manufacturing method thereof are disclosed. The tubular product comprises a tubular product body made of spirally winded and fusion-molded profiled strips, and the tubular product body comprises a column- surface tube wall, hollow reinforcing ribs spirally looped on the outer side of the body and reinforcing internal-ribs fixed in the reinforcing ribs and perpendicular to the tube wall. The internal-rib divides the hollow reinforcing rib into two parallel hollow cavities, and the fusion-molded interface locates at the reinforcing internal-rib. The tubular product is formed by the plastic profiled strip with tubular bulges on two lateral sides spirally winded and molted by the molten gel, thus the tubular product has good ring stiffness and interaction of pipe with ambient soils, also has good intensity, and the reinforcing internal-ribs improve the stability of the hollow reinforcing ribs effectively.

Description

 Inner rib reinforced outer corrugated plastic wound structure wall pipe and manufacturing method thereof

Technical field

The present invention relates to an inner rib reinforced outer corrugated plastic wound structural wall pipe, and to a method of manufacturing such a pipe.

Background technique

The outer corrugated plastic wound structural wall pipe with hollow reinforcing ribs is widely used in the construction of municipal sewage pipes due to its good joint effect of soil and soil and ring stiffness.

At present, there are generally two methods for manufacturing an outer corrugated plastic wound structural wall pipe having a hollow reinforcing rib.

Referring to Figure 1, the first manufacturing process of the above pipe. The molten strip-shaped plastic sheet 1 is first extruded by a first extruder, and then the sheet is continuously and spirally wound side by side on a circular forming cylinder equipped with a plurality of actively rotating small rollers. At the same time, the trapezoidal tubular reinforcing rib 2 is extruded by another extrusion mechanism, and after being shaped by water-cooling vacuum, the lap joint of the adjacent edges of the strips of plastic sheets on the pipe wall is struck by the same spiral winding method, trapezoidal tubular The bottom surface of the reinforcing rib 2 is appropriately heated, and at the same time, since the plastic sheet 1 is in a semi-molten state, after being pressed by the pressing wheel, the tubular reinforcing rib 2 and the two mutually overlapping strip-shaped plastic sheets 1 are fused together to form An outer corrugated plastic wound structural wall pipe having a hollow reinforcing rib. However, this process has the following defects: (1), since the rib 2 is entangled after being cooled and shaped, it is determined that the height thereof cannot be too large, so the moment of inertia of the tube wall after molding is small; (2) the rib 2 and the tube wall The bonding is difficult to control. If the temperature of the strip plastic sheet 1 is too low, the bonding is poor; if the temperature is too high, the strip plastic sheet 1 will fall from the forming roller and it is difficult to control the molding; (3) at completion After bonding, the side of the reinforcing rib 2 always has a slit 3, which causes stress concentration. When the ambient temperature alternates, the welded surface is gradually cracked by the slit 3, which easily causes the tube wall and the reinforcing rib 2 to separate and collapse.

Referring to Fig. 2, another manufacturing process of an outer corrugated plastic wound structural wall pipe having a hollow reinforcing rib. The process is first extruded by the first extruder into a profiled rectangular tube 4 having a suitably shaped fin for each other for welding on both sides of the bottom surface. The profiled rectangular tube 4 is spirally wound and formed on the forming drum after being vacuum cooled. Then, the second extruder continuously squirts the molten melt 5 to the adjacent fin connecting portions of the spirally wound shaped rectangular tubes 4, and is welded together by the pressing wheel. This process has the following disadvantages: the welding position is at the weakest part of the pipe, and the welding surface is small and the amount of melted material is small, thereby reducing the overall bending strength of the pipe.

Accordingly, it would be desirable to provide a novel strip of outer corrugated plastic wound structural wall tubing having hollow stiffeners to overcome the various disadvantages of the above-described processes and structures.

Summary of the invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an outer corrugated plastic wound structural wall pipe having a hollow reinforcing rib, which has a good ring stiffness and a joint effect of pipe and soil. It also has a high strength.

Another technical problem to be solved by the present invention is to provide a method of manufacturing the above pipe.

The technical solution adopted by the present invention to solve the technical problem thereof is:

An inner rib reinforced corrugated plastic wound structural wall pipe comprising a pipe body formed by spirally welding a profiled strip, the pipe body comprising a cylindrical pipe wall, a hollow reinforcing rib spirally wound thereon, and a hollow reinforcing rib An inner rib that is perpendicular to the wall of the tube, the reinforced inner rib separating the hollow rib into two juxtaposed hollow cavities, the weld-formed joint surface being located at the reinforcing inner rib.

The method for manufacturing the above pipe provided by the present invention is:

The invention relates to a method for manufacturing an inner rib reinforced corrugated plastic wound structure wall pipe, which is formed by spirally winding a plastic profiled strip having tubular protrusions containing hollow cavities on both sides and being melted by fusion glue. The two hollow cavities which are adjacent to each other between the wound adjacent plastic profiled strips are fused to form a hollow reinforcing rib, and an erected reinforcing rib is formed at a fusion portion in the middle of the hollow reinforcing rib.

The method of the present invention can also be improved as follows:

As an improvement of the above technical solution, the method specifically includes the following steps:

a): extruding a continuous plastic profiled strip having tubular projections containing hollow cavities on both sides by a first extruder;

b): the profiled strips obtained in step a) are spirally wound side by side on a continuously rotating forming drum such that a gap is formed between two tubular projections of adjacent plastic profiled strips that are adjacent to each other;

c): continuously extruding the molten plastic melt into the voids described in step b) with a second extruder;

d): applying opposite pressures to two adjacent tubular projections adjacent to the gap in which the melt is squeezed in step c), such that the two tubular projections are tightly integrated into one body, and the two tubular projections are welded to form the outer wall of the tube. The hollow reinforcing ribs, the side fusion portions of the two tubular projections form reinforcing inner ribs.

As a further improvement of the above technical solution, in step d), the two tubular protrusions corresponding to the two sides of the welding gap of the adjacent plastic profiled strip are carried out by a pressure roller provided with a corresponding groove structure at a corresponding portion of the outer circumference of the forming drum. Rolling, applying opposing pressure to two adjacent tubular projections adjacent to the gap that has been squeezed into the melt.

As a further improvement of the above technical solution, in step c), a composite head is disposed on the second extruder, and the steel strip formed by rolling the forming roller and conforming to the diameter of the pipe to be prepared is subjected to the curvature transformation. The second extruder extrudes the molten melt into the composite head. In the composite head, the molten melt envelops around the steel strip, and the steel strip wrapped with the melt is sandwiched in step b) In the gap, the sides of the two tubular projections and the steel strip wrapped with the melt are fused to form a reinforcing inner rib.

Since the joint surface of the pipe fusion forming of the present invention is located at the reinforcing inner rib, the welded surface between the adjacent profiled strips is far larger than all other types of wound structural wall bellows, and the welding effect is all the wound corrugations. The tube is the best so that the product obtained by the process of the invention has a higher strength. Moreover, due to the action of fusion, the middle portion of the hollow reinforcing rib of the pipe wall formed by the method of the invention forms an upright reinforcing inner rib, and the reinforced inner rib structure can effectively improve the stability of the hollow reinforcing rib, and the winding bellows of the invention The stability is superior to other wound bellows and double wall corrugated pipes.

According to the above structure of the present invention, it has high strength while ensuring good ring rigidity and good joint action of pipe and soil.

In addition, the pipe manufacturing method of the present invention can be produced by using a common winding structure wall pipe production equipment with a suitable die, a shaping sleeve and an auxiliary pressure wheel, and the equipment investment is small.

The concept, the specific structure and the technical effects of the present invention will be further described in conjunction with the accompanying drawings in order to fully understand the objects, features and advantages of the invention.

DRAWINGS

1 is a schematic structural view of an outer corrugated plastic wound structural wall pipe having a hollow reinforcing rib in the prior art;

2 is a schematic structural view of another outer corrugated plastic wound structural wall pipe having a hollow reinforcing rib in the prior art;

Figure 3 is a schematic cross-sectional structural view of the pipe of the present invention;

Figure 4 is a schematic view showing the structure of a plastic heterogeneous strip according to the present invention;

Figure 5 is a plan view of the apparatus when the pipe is manufactured using the method of the present invention;

Figure 6 is a schematic view showing the rolling of two tubular projections using a roller compaction in the method of the present invention;

Figure 7 is a cross-sectional view showing the structure of a coated steel strip in the method of the present invention.

detailed description

Referring to Fig. 3, an inner rib reinforced corrugated plastic wound structural wall pipe provided by the present invention comprises a pipe body spirally wound and welded by the profiled strip 10 shown in Fig. 4, the pipe body comprising a cylindrical pipe wall 11 a hollow reinforcing rib 12 spirally wound thereon and a reinforcing inner rib 13 in the hollow reinforcing rib 12 perpendicular to the pipe wall, the reinforcing inner rib 13 dividing the hollow reinforcing rib 12 into two juxtaposed hollow cavities 14, The welded joint surface is located at the reinforcing inner rib 13. Since the joint surface of the pipe fusion forming of the present invention is located at the reinforcing inner rib, the welded surface between the adjacent profiled strips is far larger than all other types of wound structural wall bellows, and the welding effect is all the wound corrugations. The tube is the best so that the product obtained by the process of the invention has a higher strength. Moreover, due to the action of fusion, the middle portion of the hollow reinforcing rib of the pipe wall formed by the method of the invention forms an upright reinforcing inner rib, and the reinforced inner rib structure can effectively improve the stability of the hollow reinforcing rib, and the winding bellows of the invention The stability is superior to other wound bellows and double wall corrugated pipes.

According to the above structure of the present invention, it has high strength while ensuring good ring rigidity and good joint action of pipe and soil.

The basic idea of the method for manufacturing the above-mentioned pipe provided by the present invention is that it is spirally wound by a plastic profiled strip 10 having tubular projections 100 containing hollow cavities on both sides, and is formed by spiral fusion. The two hollow cavities adjacent to each other between the adjacent plastic profiled strips 10 are fused to form a hollow bead 12, and an upstanding reinforcing inner rib 13 is formed at a fusion portion in the middle of the hollow bead 12.

Referring to FIG. 5, the method specifically includes the following steps:

a): using a first extruder 15 to extrude a continuous plastic profiled strip 10 having tubular projections 100 containing hollow cavities on both sides;

b): the profiled strips 10 obtained in the step a) are spirally wound side by side on the continuously rotating forming drum 16, such that a gap is formed between the two tubular projections 100 adjacent to each other by the adjacent plastic profiled strips 10;

c): continuously extruding the molten plastic melt into the gap described in step b) by the second extruder 17;

d): Applying opposing pressure to two adjacent tubular protrusions 100 adjacent to the gap in which the melt is squeezed in step c), such that the two tubular protrusions 100 are tightly integrated into one body, and the two tubular protrusions 100 are welded to form the outer wall of the tube. The hollow reinforcing ribs 12, the side fusion portions of the two tubular projections 100 form the reinforcing inner ribs 13.

Thus, as the forming drum 16 is continuously rotated by the sprocket-driven rotating roller, the pipe of the present invention is continuously produced.

Referring to FIG. 6, in step d), as a preferred embodiment, the pressure roller 18 provided with the corresponding groove structure at the corresponding portion of the outer circumference of the forming drum 16 corresponds to both sides of the welding gap of the adjacent plastic profiled strip 10. The two tubular protrusions 100 are crushed, applying opposing pressures to the two adjacent tubular protrusions 100 adjacent to the gap that has been squeezed into the melt, especially for the grooves, preferably having an inner narrow outer width such that the pressure is decomposed into A pressing force that sufficiently bonds the two tubular projections 100. Preferably, the pressure rollers provided at the corresponding portions on the outer circumference of the molding drum 16 may be two or more as needed.

Referring to FIG. 7, in step c), as a preferred embodiment, a composite head is disposed on the second extruder, and the steel strip formed by rolling the forming roller and the diameter of the pipe to be prepared is adapted to the curvature of the steel strip. Through the composite head, the second extruder squeezes molten melt into the composite head. In the composite head, the molten melt coats the periphery of the steel strip 19, and the steel strip wrapped with the melt is sandwiched. b) In the gap, the sides of the two tubular projections and the steel strip 19 wrapped with the melt are fused to form the reinforcing inner ribs 13 to enhance the strength of the reinforcing inner ribs 13.

The above method can be produced by using a common winding structure wall pipe production equipment with a suitable die, a shaping sleeve and an auxiliary pressure wheel, and the equipment investment is small, and can be widely applied.

The invention is of course not limited to the embodiments described above, and equivalent variations or substitutions may be made by those skilled in the art without departing from the spirit of the invention, and such equivalents or alternatives are included in the claims of the present application. Within the limits.

Claims (5)

An inner rib reinforced corrugated plastic wound structural wall pipe comprising a pipe body formed by spirally welding a profiled strip, the pipe body comprising a cylindrical pipe wall, a hollow reinforcing rib spirally wound thereon, and a hollow reinforcing rib a reinforcing inner rib perpendicular to the wall of the tube, the reinforced inner rib dividing the hollow rib into two juxtaposed cavities, It is characterized in that the fusion-molded joint surface is located at the reinforcing inner rib. The invention relates to a method for manufacturing an inner rib reinforced corrugated plastic wound structure wall pipe, which is characterized in that: the pipe is spirally wound by a plastic profiled strip having tubular protrusions containing hollow cavities on both sides and is melted and melted to form The two hollow cavities which are adjacent to each other in the spirally wound adjacent plastic profiled strips are fused to form a hollow reinforcing rib, and an erected reinforcing rib is formed at a fusion portion in the middle of the hollow reinforcing rib. The method for manufacturing an inner rib reinforced corrugated plastic wound structure wall pipe according to claim 2, comprising the steps of: a): extruding a continuous plastic profiled strip having tubular projections containing hollow cavities on both sides by a first extruder; b): the profiled strips obtained in step a) are spirally wound side by side on a continuously rotating forming drum such that a gap is formed between two tubular projections of adjacent plastic profiled strips that are adjacent to each other; c): continuously extruding the molten plastic melt into the voids described in step b) with a second extruder; d): Applying opposing pressures to two adjacent tubular projections adjacent to the gap in which the melt has been squeezed in step c), such that the two tubular projections are tightly integrated into one body, and the two tubular projections are welded to form a hollow reinforcing rib of the outer wall of the tube. The side fusion portions of the two tubular projections form reinforcing inner ribs. The method for manufacturing an inner rib reinforced corrugated plastic wound structural wall pipe according to claim 3, wherein in step d), the phase of the pressure roller provided with the corresponding groove structure at the corresponding portion of the outer circumference of the forming drum Two tubular protrusions corresponding to the two sides of the adjacent plastic strip-shaped welding gap are pressed, and opposite pressures are applied to two adjacent tubular protrusions adjacent to the gap that has been squeezed into the melt. The method for manufacturing an inner rib reinforced corrugated plastic wound structure wall pipe according to claim 3 or 4, wherein in the step c), a composite head is disposed on the second extruder, and the roller is rolled by the forming roller. The steel strip formed by the pressure and the diameter of the pipe to be prepared adapted to the curvature of the pipe passes through the composite head, and the second extruder extrudes the molten melt into the composite head, and in the composite head, the molten melt will be The steel strip is wrapped around the strip, and the rubber strip wrapped with the melt is sandwiched into the gap described in step b), and the sides of the two tubular projections are fused with the steel strip wrapped with the melt to form reinforcing ribs.

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