A repairing structure and method for a concrete pipe in pipe jacking construction

Abstract

This invention relates to a repair structure and method for concrete pipes used in pipe jacking construction. This invention applies to the field of pipe jacking construction technology. The technical problem this invention aims to solve is to provide a repair structure and method for concrete pipes used in pipe jacking construction. The technical solution adopted by this invention is: a repair structure for concrete pipes used in pipe jacking construction, used to repair broken concrete pipes during pipe jacking construction, characterized in that: an inner steel lining pipe is inserted inside the broken concrete pipe, the inner steel lining pipe is connected to the inner wall of the broken concrete pipe, and stress-bearing rings are respectively provided at the front and rear ends of the broken concrete pipe, the stress-bearing rings being connected to the inner steel lining pipe inside the broken concrete pipe.

Description

Technical Field

[0001] This invention relates to a repair structure and method for concrete pipes used in pipe jacking construction. It is applicable to the field of pipe jacking construction technology. Background Technology

[0002] Pipe jacking, also known as trenchless construction, is a pipeline installation technique that involves little or no excavation. In pipe jacking, the jacking force generated by jacking equipment in the working shaft overcomes the friction between the pipe and the surrounding soil, pushing the pipe into the ground at the designed slope and removing the excavated soil. After one section of pipe is completely driven into the soil, the second section is driven in, and the process continues. The principle is that a tunneling machine is positioned in front of the pipeline to cut through the soil and transport the material outwards via a sludge removal pipe. Behind, the thrust of the main jacking cylinder and intermediate jacking equipment pushes the pipe and tunneling machine from the working shaft through the soil to the receiving shaft. The tunneling machine is then cut and lifted, and finally, the pipe is buried between the two shafts.

[0003] As one of the main protective pipelines in pipe jacking construction, concrete pipes often serve as protective pipes for buried pipelines. Even if various human factors are effectively controlled during pipe jacking construction, unpredictable underground factors may still cause an increase in the required jacking force, leading to concrete pipe cracking. Traditional solutions include pipe breaking, lining, partial repair, and excavation. Pipe breaking is suitable for small-diameter, shallow-buried pipelines, lining and partial repair are suitable for pipelines without subsequent jacking requirements, and excavation is suitable for pipelines with convenient excavation conditions.

[0004] Nowadays, the pipe diameter and burial depth required for pipe jacking construction are increasing, and the burial sites are becoming more and more complex. Under such circumstances, the conditions required by traditional excavation or pipe breaking methods are extremely harsh. When pipe jacking construction involves large-diameter pipes, deep buried working wells, and complex ground conditions, traditional concrete pipe repair methods are no longer effective or are extremely labor-intensive and resource-intensive. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a repair structure and repair method for concrete pipes in pipe jacking construction, in view of the above-mentioned problems.

[0006] The technical solution adopted in this invention is: a repair structure for concrete pipes in pipe jacking construction, used to repair broken concrete pipes in pipe jacking construction, characterized in that: an inner steel lining pipe is inserted into the broken concrete pipe, the inner steel lining pipe is connected to the inner wall of the broken concrete pipe, and a force-bearing ring is provided at the front and rear ends of the broken concrete pipe, the force-bearing ring being connected to the inner steel lining pipe inside the broken concrete pipe.

[0007] The inner steel pipe has several holes evenly spaced, and studs are inserted into the holes. One end of the stud is fixed to the inner wall of the broken concrete pipe, and the other end of the stud passes through the hole and is connected to a nut.

[0008] Several holes are formed on the inner wall of the broken concrete pipe, and the studs are inserted into the holes. The studs are fixed in the holes by high-penetration epoxy resin liquid.

[0009] High-penetration epoxy resin liquid is injected into the gap between the inner steel pipe and the broken concrete pipe.

[0010] An annular water-stop rubber is provided between the stress ring and the corresponding end face of the cracked concrete pipe.

[0011] The force-bearing ring is composed of several force-bearing arc components spliced ​​together.

[0012] A method for repairing concrete pipes during pipe jacking construction, characterized in that:

[0013] Repair cracks in broken concrete pipes;

[0014] A hydraulic push mechanism is used to create a gap between the cracked concrete pipe and the concrete pipes before and after it.

[0015] The inner steel pipe is pushed into the cracked concrete pipe and connected to the inner wall of the cracked concrete pipe.

[0016] A stress-bearing ring corresponding to the front and rear ends of the cracked concrete pipe is installed in the gap before and after the cracked concrete pipe. The stress-bearing ring is connected to the inner lining steel pipe inside the cracked concrete pipe.

[0017] The connection between the inner steel lining pipe and the inner wall of the cracked concrete pipe includes:

[0018] A borehole is formed by drilling into the inner wall of the cracked concrete pipe through holes in the inner steel pipe.

[0019] Insert studs through holes in the inner steel pipe into the borehole, and inject high-penetration epoxy resin liquid into the borehole.

[0020] Inject high-penetration epoxy resin liquid into the gap between the inner steel pipe and the inner wall of the broken concrete pipe.

[0021] Connect a nut to the end of the stud to fix the stud to the inner steel pipe.

[0022] Before installing the stress ring, install annular water-stop rubber on the front and rear end faces of the cracked concrete pipe.

[0023] The method for repairing cracks in ruptured concrete pipes involves using a mixture of high-penetration epoxy resin and cement grout.

[0024] The beneficial effects of this invention are: the invention uses an inner steel pipe as a support, which enhances the structural stability of the concrete pipe; during the subsequent pipe jacking construction process, the repaired concrete pipe does not directly contact the jacking force, but is driven by the movement of the inner steel pipe, and the force-bearing area of ​​the concrete pipe changes from the annular surface to the entire inner surface. The increase in the force-bearing area greatly reduces the possibility of the concrete pipe being damaged again.

[0025] This invention uses studs and highly permeable epoxy resin to stably fix the relative position of the inner steel pipe and the concrete pipe, preventing lateral displacement. Even if the jacking force is too great and lateral displacement occurs, the annular water-stop rubber pad can buffer part of the jacking force.

[0026] This invention is safe and environmentally friendly, simple to operate, and uses inexpensive and readily available materials and equipment. The repaired pipe does not affect subsequent use and is suitable for complex concrete pipe rupture situations. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the repair structure in the embodiment.

[0028] Figure 2 This is a schematic diagram of the inner steel pipe in the embodiment.

[0029] Figure 3 This is a schematic diagram of the hydraulic actuation mechanism in the embodiment.

[0030] Figure 4 This is a schematic diagram of the structure with a track inside the concrete pipe in the embodiment.

[0031] Figure 5 This is a structural schematic diagram of the stressed arc component in the embodiment.

[0032] 1. Inner steel pipe; 11. Reserved hole; 2. Jack receiving and applying force device; 21. Force-bearing base; 22. Force-applying base; 3. Track; 4. Force-bearing ring; 41. Force-bearing arc component; 411. Arc support plate; 412. Connecting pipe segment; 413. Lifting ring; 5. Annular water-stop rubber pad; 6. Stud. Detailed Implementation

[0033] like Figure 1 As shown, this embodiment is a repair structure for concrete pipes in pipe jacking construction, used to repair broken concrete pipes during pipe jacking construction. An inner steel pipe is coaxially inserted inside the broken concrete pipe, and there is a uniform gap between the inner steel pipe and the inner wall of the broken concrete pipe. Force-bearing rings are respectively provided at the front and rear ends of the broken concrete pipe, and the force-bearing rings are connected to the inner steel pipe inside the broken concrete pipe.

[0034] In this example, several holes are evenly spaced on the inner steel pipe (see...). Figure 2A stud is inserted into the hole of the inner steel pipe. One end of the stud is fixed to the inner wall of the broken concrete pipe, and the other end of the stud passes through the hole and is connected to a nut. Thus, the inner steel pipe and the inner wall of the broken concrete pipe are fixedly connected by the stud and the nut.

[0035] In this embodiment, several holes are drilled into the inner wall of the broken concrete pipe, and studs are inserted into the holes. The studs penetrate the concrete pipe to a depth of 1 / 3 of the wall thickness. The studs are fixed in the holes on the inner wall of the broken concrete pipe by high-penetration epoxy resin liquid.

[0036] In this embodiment, a high-penetration epoxy resin liquid is injected into the gap between the inner steel pipe and the inner wall of the broken concrete pipe to connect the inner steel pipe and the broken concrete pipe together.

[0037] In this example, the stress ring is a ring structure spliced ​​together from several arc-shaped stress arc components. Each stress arc component has an arc support plate that is adapted to the end face of the broken concrete pipe, and a connecting segment adapted to the inner steel lining pipe is provided corresponding to the inner diameter of the arc support plate.

[0038] The method for repairing concrete pipes during pipe jacking construction, as described in this embodiment, specifically includes the following steps:

[0039] S1. Use high-penetration epoxy resin liquid and cement grout to repair cracks on broken concrete pipes during pipe jacking construction.

[0040] S2. Use a hydraulic push mechanism to create a gap sufficient for installing the stress ring and annular water-stop rubber pad between the cracked concrete pipe and the concrete pipes before and after it.

[0041] like Figure 3 As shown, in this example, the hydraulic push mechanism includes a force-bearing base fixed to the inner wall of the concrete pipe and a force-applying base fixed to the inner wall of another adjacent concrete pipe. A jack arranged parallel to the axis of the concrete pipe is provided between the force-bearing base and the force-applying base, and a gap is formed between the two adjacent concrete pipes by means of the jack.

[0042] When excessive friction on the outer wall of a concrete pipe makes it difficult to push the joints open, multiple load-bearing bases and force-applying bases can be installed on the inner wall of the concrete pipe, and the concrete pipe can be pushed open section by section.

[0043] S3. Using the gap between the pipes formed in step S2, install annular water-stop rubber pads that match the shape and size of the end faces on the front and rear ends of the broken concrete pipe. Since the annular water-stop rubber pads are not easy to slip off under the force, they can be simply glued to the front and rear ends of the concrete pipe using an adhesive such as a high-penetration epoxy resin liquid.

[0044] S4. Install rails inside the cracked concrete pipe (see...) Figure 4This ensures that there is a uniform gap between the inner steel lining pipe subsequently inserted into the cracked concrete pipe and the inner wall of the concrete pipe.

[0045] S5. Use the main hydraulic jack and the top ring steel pipe with wax coating on the outer surface to push the inner steel pipe to the set position inside the cracked concrete pipe.

[0046] In some projects, concrete pipes are used as protective pipes, with steel pipes wrapped inside. In this case, the inner steel pipe and the inner steel pipe are of different sizes. To improve the connection performance, a reducer can be installed at the interface of the steel pipe that is directly connected to the inner steel pipe.

[0047] S6. At the location of the hole left in the inner steel pipe, use an electric drill to drill a hole on the inner surface of the concrete pipe with a diameter slightly larger than the stud. The size of the hole on the inner surface of the concrete pipe and the hole reserved on the surface of the inner steel pipe depend on whether the high-penetration epoxy resin liquid can be injected into the hole on the inner surface of the concrete pipe and the gap between the inner steel pipe and the concrete pipe.

[0048] In this example, a stud is inserted into the borehole through a hole in the inner steel pipe, and a high-penetration epoxy resin is injected into the borehole; a high-penetration epoxy resin is injected into the gap between the inner steel pipe and the inner wall of the broken concrete pipe; a nut is connected to the end of the stud to fix the stud to the inner steel pipe.

[0049] In this embodiment, the length of the stud meets the following two conditions: the stud penetrates into the concrete pipe by 1 / 3 of the concrete pipe wall thickness; and the length of the stud protruding from the inner steel pipe is 15cm.

[0050] In this example, the length of the studs connecting the concrete pipe and the steel pipe does not significantly help the shear resistance after the connection, but the number of studs has a significant impact on the shear resistance. The jacking force during the pipe jacking construction process is equivalent to the shear force, so it is understandable that the number of reserved holes in the steel pipe can be adjusted appropriately according to the required jacking force.

[0051] S7. Make a stress ring according to the size of the inner steel pipe, and install the stress arc component to the front and rear ends of the inner steel pipe in sequence.

[0052] The method for installing the stressed arc component in this embodiment is as follows:

[0053] Two pulleys are welded to the top of the inner steel pipe on the side where the load-bearing arc component needs to be installed;

[0054] Thread the two ropes through the lifting rings on the inner wall of the stressed arc-shaped component (see...). Figure 5 And pass through the pulley;

[0055] The stressed arc component is lifted with a rope, and its posture is adjusted in the air. A winch can be used for lifting.

[0056] Move the stressed arc-shaped component to the welding position;

[0057] The welder welds the connecting segments of the stressed arc-shaped component to the inner steel liner. In this example, V-shaped weld joints are pre-drilled on the front and rear ends of the inner steel liner and on the end faces of the connecting segments on the stressed arc-shaped component. Welding is required between different stressed arc-shaped components, and a certain distance must be maintained between the stressed ring and the annular water-stop rubber gasket.

[0058] S8. Using the concrete pipe with the added inner steel pipe as the boundary, push the inner steel pipe in on both sides.

[0059] In the subsequent jacking of concrete pipes, wax can be sprayed on the surface of the concrete pipe to reduce resistance. To ensure that the water flow inside the pipe is not affected, the part of the stud that extends beyond the inner steel lining pipe can be cut off after the jacking construction is completed.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A repair structure for concrete pipes used in pipe jacking construction, for repairing broken concrete pipes during pipe jacking construction, characterized in that: An inner steel lining is inserted into the broken concrete pipe. The inner steel lining is connected to the inner wall of the broken concrete pipe. Force-bearing rings are provided at the front and rear ends of the broken concrete pipe, and the force-bearing rings are connected to the inner steel lining inside the broken concrete pipe. The inner steel pipe is evenly provided with several holes, and studs are inserted into the holes. One end of the stud is fixed to the inner wall of the broken concrete pipe, and the other end of the stud passes through the hole and is connected to a nut. Several drill holes are formed on the inner wall of the broken concrete pipe, and the studs are inserted into the drill holes. The studs are fixed in the drill holes by high-penetration epoxy resin liquid. High-penetration epoxy resin liquid is injected into the gap between the inner steel pipe and the broken concrete pipe.

2. The repair structure according to claim 1, characterized in that: An annular water-stop rubber is provided between the stress ring and the corresponding end face of the cracked concrete pipe.

3. The repair structure according to claim 1, characterized in that: The force-bearing ring is composed of several force-bearing arc components spliced ​​together.

4. A method for repairing concrete pipes during pipe jacking construction, characterized in that: Repair cracks in broken concrete pipes; A hydraulic push mechanism is used to create a gap between the cracked concrete pipe and the concrete pipes before and after it. The inner steel pipe is pushed into the cracked concrete pipe and connected to the inner wall of the cracked concrete pipe. A stress-bearing ring corresponding to the front and rear ends of the fractured concrete pipe is installed in the gap before and after the fractured concrete pipe. The stress-bearing ring is connected to the inner lining steel pipe inside the fractured concrete pipe. The connection between the inner steel lining pipe and the inner wall of the cracked concrete pipe includes: A borehole is formed by drilling into the inner wall of the cracked concrete pipe through holes in the inner steel pipe. Insert studs through holes in the inner steel pipe into the borehole, and inject high-penetration epoxy resin liquid into the borehole. Inject high-penetration epoxy resin liquid into the gap between the inner steel pipe and the inner wall of the broken concrete pipe. Connect a nut to the end of the stud to fix the stud to the inner steel pipe.

5. The repair method according to claim 4, characterized in that: Before installing the stress ring, install annular water-stop rubber on the front and rear end faces of the cracked concrete pipe.

6. The repair method according to claim 4, characterized in that, The cracks in the repaired concrete pipe were treated with a mixture of high-penetration epoxy resin and cement grout.

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