Flexible joint, support structure and construction method for a curtain of pipes with a profiled cross-section

Abstract

The application discloses a flexible joint, a supporting structure and a construction method for a pipe roof with a special-shaped section, and the flexible joint comprises a first joint and a second joint; the tail end of the first joint is a hinged part, the front end of the first joint is provided with a first clamping claw and a second clamping claw, and the first clamping claw and the second clamping claw form a semi-closed claw structure; the first joint and the second joint are completely same in structure; the first joint and the second joint are engaged with each other; the tail end of the second joint is a hinged part; the first joint and the second joint are connected with supporting steel pipes through the hinged parts, so that the transverse connection of the pipe roof with the special-shaped section is realized, and meanwhile, the corresponding construction method is provided, and the problem that the pipe roof supporting construction is difficult to implement in various underground structures with special-shaped sections and high water pressure composite strata is solved.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking and pipe curtain engineering technology, specifically to a flexible joint, support structure, and construction method for irregular cross-section pipe curtains. Background Technology

[0002] Currently, urban clusters in my country are experiencing a peak period of underground infrastructure construction. During the construction of underground projects with irregular cross-sections such as subway stations and tunnels, shallow-buried composite strata are often encountered, and pipe jacking is commonly used for support structure construction. Currently, ordinary pipe jacking systems mostly use interlocking connections, with adjacent support pipes rigidly connected. In composite strata, the jacking pipe axis is prone to deviation, leading to jamming of adjacent support pipes. Alternatively, a pipe jacking freezing method is used where adjacent support pipes are not connected; however, the freezing method is limited in its application due to high cost and difficulty in deformation control.

[0003] To address the aforementioned issues, the applicant employs a flexible structure to connect adjacent support pipes in the pipe curtain. While ensuring the connection strength of the pipe curtain, it reduces the accuracy requirements of the pipe curtain, making it suitable for the support construction of various irregular underground structures. Water stoppage between pipe curtains is achieved by using joint sealing grease in conjunction with stratum grouting. Its application potential far exceeds that of the pipe curtain freezing method, and it has broad application prospects in soft soil underground engineering. Summary of the Invention

[0004] The purpose of this invention is to provide a flexible joint, support structure and construction method for irregular cross-section pipe jacking, so as to solve the problem of the difficulty in implementing pipe jacking support construction in various irregular cross-section underground structures and high water pressure composite strata mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a flexible joint for irregular cross-section pipe curtain, comprising: a first joint and a second joint; the tail end of the first joint is a hinged portion, and the front end of the first joint is provided with a first locking claw and a second locking claw, the first locking claw and the second locking claw forming a semi-closed ratchet-like structure; the structures of the first joint and the second joint are completely identical; the first joint and the second joint interlock with each other; the tail end of the second joint is a hinged portion, and both the first joint and the second joint are connected to the support steel pipe through the junction portion, thereby realizing the lateral connection of the irregular cross-section pipe curtain.

[0006] As a preferred technical solution, the contact surfaces of the meshing portions of the first and second locking jaws are provided with lubricant.

[0007] As a preferred technical solution, the lubricant is a sealing grease.

[0008] As a preferred technical solution, the hinged part includes a male hinge joint and a female hinge joint. The male hinge joint is disposed at the tail end of the first joint and the second joint, and the female hinge joint is fixed to the support steel pipe. The male hinge joint and the female hinge joint are hinged to each other.

[0009] A support structure for irregular cross-section pipe jacking uses any of the flexible joints for irregular cross-section pipe jacking as described above, comprising multiple support units, each support unit comprising a cylindrical support steel pipe filled with self-compacting concrete, the multiple support units being arranged around the outer periphery of the irregular cross-section, and the multiple support units being interconnected through the flexible joints for irregular cross-section pipe jacking.

[0010] A construction method for pipe curtain support structures with irregular cross-sections includes the following steps:

[0011] S1. Design the pipe curtain support system according to the project requirements, determine the irregular cross-sectional shape, the spacing between adjacent pipes, the size and location of the joints, and process the joint components in the factory.

[0012] S2. Excavate a vertical shaft at the construction site, set up a back wall, and build a construction platform;

[0013] S3. Install the pipe curtain support structure as described in claim 5 in sequence: support steel pipe, handshake joint, and sealing grease, so that the joint device and the pipe section can be flexibly connected.

[0014] S4. The steel pipes are jacked in sequentially along the design trajectory line of the pipe jacking frame. During the process, attention should be paid to the jacking sequence so that adjacent joints can be effectively and smoothly engaged. Grouting is carried out to reduce drag while the pipe jacking is being constructed.

[0015] S5. After the pipe jacking system is completed, grout is injected into the stratum through the support steel pipes to enhance the water-stopping effect between the pipe jacks. Then, self-compacting concrete is injected into the pipe. After it reaches the design strength, the tunnel inside the pipe jacking is excavated and the bottom support is installed. Then, the floor concrete is poured and other work is carried out.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) The horizontal joint connection of the pipe curtain is flexible and adjustable, which can effectively meet the diverse needs of the joint connection angle of the irregular cross section pipe curtain, and allow the adjacent support pipes to undergo a certain displacement, thus reducing the accuracy requirements of the pipe curtain.

[0018] (2) After the joint is installed, the construction process is simple and safe, the connection accuracy of adjacent pipes is higher and the connection is tighter, the construction period can be shortened, the economy is strong, and the amount of materials used can be effectively reduced.

[0019] (3) The joint is filled with sealing grease, which has a certain ability to stop geological water.

[0020] (4) The concrete injected into the pipe section in the later stage seeps into the joint device, and the pipe section joint assembly can effectively enhance the structural bending bearing capacity.

[0021] (4) Under composite strata, full-section or segmented joints can be used for connection according to the span of underground structures, structural bearing requirements, ground settlement control requirements and economic principles. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a flexible joint for irregular cross-section pipe curtain according to the present invention.

[0023] Figure 2 This is a schematic diagram of the structure of a flexible joint for irregular cross-section pipe curtain according to the present invention from another perspective.

[0024] Figure 3 This is a schematic diagram of a support structure for irregular cross-section pipe curtain according to the present invention;

[0025] Figure 4 A schematic diagram of the cross-sectional structure of a horseshoe-shaped tube curtain;

[0026] Figure 5 This is a structural schematic diagram of a support unit.

[0027] In the diagram: 1. Support steel pipe; 2. Pipe curtain lining; 3. Improved joint device; 4. Engagement part; 5. Male hinge joint; 6. Female hinge joint; 7. Sealing grease; 8. Self-compacting concrete; 9. Water nozzle; 10. Piston block II; 11. Cylinder; 12. Expansion body. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 2-3 This invention provides a technical solution: a flexible joint for irregular cross-section pipe curtains, comprising: a first joint and a second joint; the tail end of the first joint is a hinged portion, and the front end of the first joint is provided with a first locking claw and a second locking claw, the first locking claw and the second locking claw forming a semi-enclosed ratchet-like structure; the structures of the first joint and the second joint are completely identical; the first joint and the second joint interlock with each other; the contact surfaces of the interlocking portions of the first locking claw and the second locking claw are provided with sealing grease, and the tail end of the second joint is a hinged portion.

[0030] Please see Figure 1 The hinged part includes a male hinge joint and a female hinge joint. The male hinge joint is located at the tail end of the first joint and the second joint. The female hinge joint is fixed to the support steel pipe. The male hinge joint and the female hinge joint are hinged to each other. The first joint and the second joint are both connected to the support steel pipe through the junction, thereby realizing the lateral connection of the irregular cross-section pipe curtain.

[0031] Please see Figure 1 and Figure 4 This solution also provides a support structure for irregular cross-section pipe curtains using the aforementioned flexible joints, enabling support for pipe curtains with irregular cross-sections. Figure 3 The support structure for the horseshoe-shaped pipe curtain section shown includes multiple support units, each consisting of a cylindrical support steel pipe filled with self-compacting concrete. The multiple support units are arranged around the outer periphery of the irregular cross-section and are interconnected through the flexible joints used for the irregular cross-section pipe curtain.

[0032] Meanwhile, this solution also provides a structural construction method for irregular cross-section pipe jacking proposed in this invention. The pipe jacking support structure has good structural strength and waterproof performance, and is particularly suitable for various irregular cross-section underground structures and high water pressure composite strata, including the following steps:

[0033] S1. Design the pipe curtain support system according to the project requirements, determine the irregular cross-sectional shape, the spacing between adjacent pipes, the size and location of the joints, and process the joint components in the factory.

[0034] S2. Excavate a vertical shaft at the construction site, set up a back wall, and build a construction platform;

[0035] S3. Install the pipe curtain support steel pipe, the handshake joint, and the sealing grease in sequence to achieve a flexible connection between the joint device and the pipe section.

[0036] S4. The steel pipes are jacked in sequentially along the design trajectory line of the pipe jacking frame. During the process, attention should be paid to the jacking sequence so that adjacent joints can be effectively and smoothly engaged. Grouting is carried out to reduce drag while the pipe jacking is being constructed.

[0037] S5. After the pipe jacking system is completed, grout is injected into the stratum through the support steel pipes to enhance the water-stopping effect between the pipe jacks. Then, self-compacting concrete is injected into the pipe. After it reaches the design strength, the tunnel inside the pipe jacking is excavated and the bottom support is installed. Then, the floor concrete is poured and other work is carried out.

[0038] Specifically, such as Figure 4The diagram shows a horseshoe-shaped pipe curtain cross-section structure, a common type of irregular cross-section pipe curtain structure. Pipe sections 1 are interconnected via an improved joint device 3, forming a frame inside which is the pipe curtain lining 2, serving as a pre-support structure for subsequent construction. The front end of the handshake joint 4 has an arc-shaped cavity, ensuring a certain degree of deflection flexibility even when the two joints are engaged. The rear end of joint 4 is a male hinge joint 5.

[0039] like Figure 1 The diagram shows the structure of the pipe curtain support pipe with the female hinge joint 6 installed. It achieves a flexible connection with the handshake joint 4 through a connection method. The inner arc surface of the female hinge joint 6 can be fitted with sealing grease to enhance the sealing performance of this part. The position of the hinge joint can be set according to the specific shape of the pipe curtain.

[0040] like Figure 4 As shown Figure 1 The enlarged view shows a portion of the improved joint device 3 during engagement. The handshake joint 4 is flexibly connected to the pipe jacking support pipe via a hinge. Adjacent handshake joints 4 form a cavity at their connection points, allowing for flexible connection between adjacent pipe jacking support pipes. Simultaneously, the cavity of the handshake joint is filled with sealing grease 7 for waterproofing. When there is a construction deviation in the position of adjacent pipe jacking support pipes, both flexible joints deflect, automatically adjusting the position of the support pipes to prevent jamming during pipe section jacking while maintaining a reliable connection between adjacent support pipes. After the pipe jacking construction is completed, grouting can be injected into the soil between the pipes to reinforce the pipe jacking and improve its water-stopping performance. Simultaneously, self-compacting concrete 8 is injected into the pipe jacking support pipes to enhance the structural rigidity of the pipe jacking, completing the pipe jacking support system.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A support structure for irregular cross-section pipe curtains, characterized in that, It includes multiple support units, each of which includes a cylindrical support steel pipe filled with self-compacting concrete. The multiple support units are arranged around the outer periphery of the irregular cross-section and are interconnected by flexible joints. The flexible joint includes: a first joint and a second joint; the tail end of the first joint is a hinged part, and the front end of the first joint is provided with a first locking claw and a second locking claw, which form a semi-closed ratchet-like structure; the first joint and the second joint have the same structure; the first joint and the second joint interlock with each other; the tail end of the second joint is a hinged part, and both the first joint and the second joint are connected to the support steel pipe through the junction, thereby realizing the lateral connection of the irregular cross-section pipe curtain; the hinged part includes a male hinge joint and a female hinge joint, the male hinge joint is set at the tail end of the first joint and the second joint, the female hinge joint is fixed to the support steel pipe, and the male hinge joint and the female hinge joint are hinged to each other.

2. A construction method for a pipe curtain support structure with irregular cross-section, characterized in that, Includes the following steps: S1. Design the pipe curtain support system according to the project requirements, determine the irregular cross-sectional shape, the spacing between adjacent pipes, the size and location of the joints, and process the joint components in the factory. S2. Excavate a vertical shaft at the construction site, set up a back wall, and build a construction platform; S3. Install the pipe curtain support structure as described in claim 1 in sequence: support steel pipe, handshake joint, and sealing grease, so that the joint device and the pipe section can be flexibly connected. S4. The steel pipes are jacked in sequentially along the design trajectory line of the pipe jacking frame. During the process, attention should be paid to the jacking sequence so that adjacent joints can be effectively and smoothly engaged. Grouting is carried out to reduce drag while the pipe jacking is being constructed. S5. After the pipe jacking system is completed, grout is injected into the stratum through the support steel pipes to enhance the water-stopping effect between the pipe jacks. Then, self-compacting concrete is injected into the pipe. After it reaches the design strength, the tunnel inside the pipe jacking is excavated and the bottom support is installed. Then, the floor concrete is poured and other work is carried out.

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