Pipe joint structure for tunnel portal construction in pipe-jacking tunnel
By pre-embedding steel boxes and longitudinal and transverse ribs in the concrete pipe section structure during pipe jacking tunnel construction, the problems of time-consuming, labor-intensive, and safety hazards associated with traditional opening methods have been solved, enabling rapid and safe portal construction and ensuring the integrity and connection quality of the concrete pipe sections.
Patent Information
- Application Number
- CN202520424899.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-11
AI Technical Summary
In traditional pipe jacking tunnel construction, opening the tunnel is time-consuming and labor-intensive, poses safety hazards, and it is difficult to install reinforcement bars on existing concrete pipe sections, affecting the integrity and quality.
The concrete pipe section structure adopts a pre-embedded steel box. The steel box is equipped with longitudinal and transverse ribs and an isolation layer. After removal, it forms a transverse passage portal and is connected to the concrete through upper and lower hooks. It is suitable for rapid opening of small cross-section tunnels.
It saves construction time, reduces costs, ensures construction safety, minimizes the impact on tunnel quality, and ensures the integrity and connection quality of concrete pipe sections.
Smart Images
Figure CN223794161U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe jacking construction technology, specifically a pipe section structure used for the construction of the portal inside a pipe jacking tunnel. Background Technology
[0002] Pipe jacking is a construction technique that uses a jacking device to advance pipes section by section underground, suitable for the development of urban underground spaces. In recent years, with the acceleration of urbanization, pipe jacking technology has been widely used, especially in applications involving complex geological conditions and existing structures. As the development of underground space continues, construction has gradually evolved from initial development to expansion and renovation. New pipe jacking tunnels often need to connect with existing tunnels, sites, etc., or construct cross passages, all of which require "opening" within the pipe jacking tunnel. Traditionally, after the pipe jacking tunnel is completed, temporary supports are installed, and excavators with hydraulic breakers, rock drills, or wire saws are used to break through the passage. However, for small-section tunnels, large machinery cannot be used, and manual labor and some handheld rock-breaking equipment are required for opening, which is time-consuming, labor-intensive, and poses significant safety hazards. After opening, upper and lower crossbeams need to be installed to connect the joints of the pipe jacking to form a whole and to bear the pressure of the upper soil. Reinforcing bars need to be installed at the crossbeam locations. However, the concrete used in the pipe sections is of a higher grade, with greater strength and thinner wall thickness, making it difficult to achieve the standard rebar installation depth. This also damages the integrity of the original jacking pipe sections and affects their quality. Utility Model Content
[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a pipe section structure for the construction of the inner portal of a pipe jacking tunnel that can save construction time, effectively save costs, and ensure the overall quality of the concrete pipe section.
[0004] This utility model is achieved through the following technical solution: a pipe section structure for the construction of an internal portal in a pipe jacking tunnel, comprising a concrete pipe section, a steel box, and temporary supports. The concrete pipe section is composed of a top plate, a bottom plate, and a side plate, and has a U-shaped structure. The steel box is pre-embedded between the top plate and the bottom plate, and the steel box and the side plate are parallel to each other. After the steel box is removed, a transverse passage portal is formed. The temporary supports are set between the top plate and the bottom plate and are located on the side away from the side plate.
[0005] Furthermore: the steel box has a hexahedral structure, the steel box includes a steel shell, an upper steel plate, and a lower steel plate, the upper steel plate is disposed on the top of the steel shell, the upper steel plate is connected to the top wall of the transverse passage door, the lower steel plate is disposed on the bottom of the steel shell, and the lower steel plate is connected to the bottom wall of the transverse passage door.
[0006] Furthermore: the steel shell is provided with longitudinal and transverse ribs, the steel shell is filled with concrete, and the longitudinal and transverse ribs divide the concrete filled into the steel shell into multiple pieces.
[0007] Furthermore: the upper steel plate is provided with an upper pull hook, and the lower steel plate is provided with a lower pull hook. The upper steel plate is pre-embedded in the top wall of the transverse passageway through the upper pull hook, and the lower steel plate is pre-embedded in the bottom wall of the transverse passageway through the lower pull hook.
[0008] Furthermore, isolation layers are provided between the inner wall of the steel shell and the concrete, between the longitudinal and transverse ribs and the concrete, between the upper steel plate and the concrete, and between the lower steel plate and the concrete.
[0009] Furthermore, the isolation layer is a silicone oil isolation layer or a polytetrafluoroethylene isolation layer.
[0010] Furthermore, the temporary support is a steel support.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] 1. This utility model pre-embeds steel boxes during the prefabrication stage of concrete pipe sections and quickly removes the steel boxes and concrete blocks after the tunnel is completed. This can save construction time and eliminate the need to chisel away the concrete in the tunnel portal area. The steel plates used in this process can be reused later, effectively saving costs. Moreover, the steel boxes are easy to break, reducing manual labor input, ensuring construction safety, and are suitable for opening up small-section tunnels that cannot be accessed by machinery.
[0013] 2. Isolation layers are set between the inner wall of the steel shell and the concrete, between the longitudinal and transverse ribs and the concrete, between the upper steel plate and the concrete, and between the lower steel plate and the concrete. This can minimize the difficulty of the later portal construction and allow the use of small machinery to break the portal concrete, thus minimizing the impact of excavating the pipe section concrete on the completed tunnel and ensuring quality.
[0014] 3. The upper steel plate is equipped with an upper hook, and the lower steel plate is equipped with a lower hook. The upper and lower hooks can ensure the effective connection between the steel shell and the concrete pipe section. At the same time, they can also serve as the connection surface for the upper and lower beam reinforcement cages in the later stage, effectively ensuring the connection quality between the ring beam and the concrete pipe section and ensuring its integrity. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;
[0016] Figure 2 This is a schematic diagram of the structure of the present invention for removing the steel box;
[0017] Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ;
[0018] Figure 4 This is a schematic diagram of the structure of the steel box of this utility model;
[0019] Figure 5 This is a schematic diagram of the upper pull hook structure of this utility model. Figure 1 ;
[0020] Figure 6 This is a schematic diagram of the upper pull hook structure of this utility model. Figure 2 ;
[0021] Figure 7 This is a schematic diagram of the structure of the pull-down hook of this utility model;
[0022] Figure 8 This is a top view of the steel box of this utility model.
[0023] Explanation of reference numerals in the attached drawings: 1-Concrete pipe section, 2-Steel box, 3-Temporary support, 4-Top plate, 5-Bottom plate, 6-Side plate, 7-Transverse passageway, 8-Steel shell, 9-Upper steel plate, 10-Lower steel plate, 11-Longitudinal and transverse ribs, 12-Upper hook, 13-Lower hook, 14-Isolation layer, 15-Concrete. Detailed Implementation
[0024] Figures 1 to 8 This utility model provides a schematic diagram of a pipe section structure for the construction of an internal portal in a pipe jacking tunnel. It includes a concrete pipe section 1, a steel box 2, and a temporary support 3. The concrete pipe section 1 is composed of a top plate 4, a bottom plate 5, and a side plate 6, and has a U-shaped structure. The steel box 2 is embedded between the top plate 4 and the bottom plate 5, and the steel box 2 and the side plate 6 are parallel to each other. After the steel box 2 is removed, a transverse passage portal 7 is formed. The temporary support 3 is set between the top plate 4 and the bottom plate 5 and is located on the side away from the side plate 6.
[0025] The steel box 2 has a hexahedral structure and includes a steel shell 8, an upper steel plate 9, and a lower steel plate 10. The upper steel plate 9 is located on the top of the steel shell 8 and is connected to the top wall of the transverse passage door 7. The lower steel plate 10 is located at the bottom of the steel shell 8 and is connected to the bottom wall of the transverse passage door 7.
[0026] The steel shell 8 is provided with longitudinal and transverse ribs 11, and the steel shell 8 is filled with concrete 15. The longitudinal and transverse ribs 11 divide the concrete 15 filled into the steel shell 8 into multiple pieces.
[0027] The upper steel plate 9 is equipped with an upper hook 12, and the lower steel plate 10 is equipped with a lower hook 13. The upper steel plate 9 is embedded in the top wall of the transverse passageway 7 through the upper hook 12, and the lower steel plate 10 is embedded in the bottom wall of the transverse passageway 7 through the lower hook 13.
[0028] An isolation layer 14 is provided between the inner wall of the steel shell 8 and the concrete 15, between the longitudinal and transverse ribs 11 and the concrete 15, between the upper steel plate 9 and the concrete 15, and between the lower steel plate 10 and the concrete 15.
[0029] The isolation layer 14 is a silicone oil isolation layer 14 or a polytetrafluoroethylene isolation layer 14.
[0030] Temporary support 3 is a steel support.
[0031] The dimensions of the steel box 2 in this invention are determined based on the cross-sectional dimensions of the pipe jacking tunnel, the dimensions of the pipe sections, and the dimensions of the tunnel portal. The steel box 2 is pre-embedded during the pipe section prefabrication stage. Longitudinal and transverse ribs 11 are installed inside the steel box 2, and concrete 15 is filled inside the steel box 2. The concrete 15 is poured simultaneously with the concrete pipe section 1. The upper hook 12 of the upper steel plate 9 at the top of the steel box 2 and the lower hook 13 of the lower steel plate 10 at the bottom of the steel box 2 are embedded in the concrete pipe section 1.
[0032] After the prefabrication of the pipe sections is completed, the pipe jacking and pushing construction is carried out. After the tunnel is completed, temporary support 3 is set at the opening and the steel box 2 is removed. When removing the steel box 2, the inner steel plate of the concrete pipe section 1 is cut off to expose the filled concrete 15. Since the inner wall of the steel shell 8 and the concrete 15, the longitudinal and transverse ribs 11 and the concrete 15, the upper steel plate 9 and the concrete 15, and the lower steel plate 10 and the concrete 15 are all separated by isolation layers 14, the filling slack concrete and the steel plate are basically unbonded. In addition, the longitudinal and transverse ribs 11 divide the filled concrete 15 into multiple pieces. The concrete 15 filled in the steel box 2 can be removed or pried off piece by piece. Continue to cut the longitudinal and transverse ribs 11 until all the concrete 15 inside the steel box 2 of a single concrete pipe section 1 is removed. Then, all the longitudinal and transverse ribs 11 and the steel shell 8 are removed, leaving the upper steel plate 9 and the lower steel plate 10, finally forming the transverse passage portal 7.
[0033] The above detailed description is a specific description of a feasible embodiment of the present utility model. This embodiment is not intended to limit the patent scope of the present utility model. All equivalent implementations or modifications that do not depart from the present utility model should be included in the patent scope of this case.
Claims
1. A pipe segment structure for portal construction inside a pipe jacking tunnel, characterized in that: The system includes concrete pipe sections, steel boxes, and temporary supports. The concrete pipe sections are composed of a top plate, a bottom plate, and side plates, and are in a U-shaped structure. The steel boxes are embedded between the top plate and the bottom plate, and the steel boxes and the side plates are parallel to each other. After the steel boxes are removed, a transverse passageway is formed. The temporary supports are set between the top plate and the bottom plate and are located on the side away from the side plates.
2. The pipe segment structure for portal construction inside a pipe jacking tunnel according to claim 1, characterized in that: The steel box has a hexahedral structure and includes a steel shell, an upper steel plate, and a lower steel plate. The upper steel plate is located on the top of the steel shell and is connected to the top wall of the transverse passage door. The lower steel plate is located at the bottom of the steel shell and is connected to the bottom wall of the transverse passage door.
3. The pipe segment structure for portal construction inside a pipe jacking tunnel according to claim 2, characterized in that: The steel shell is provided with longitudinal and transverse ribs, and the steel shell is filled with concrete. The longitudinal and transverse ribs divide the concrete filled into the steel shell into multiple pieces.
4. The pipe segment structure for portal construction inside a pipe jacking tunnel according to claim 3, characterized in that: The upper steel plate is equipped with an upper pull hook, and the lower steel plate is equipped with a lower pull hook. The upper steel plate is pre-embedded in the top wall of the transverse passageway through the upper pull hook, and the lower steel plate is pre-embedded in the bottom wall of the transverse passageway through the lower pull hook.
5. A pipe segment structure for portal construction inside a pipe jacking tunnel according to claim 3, characterized in that: An isolation layer is provided between the inner wall of the steel shell and the concrete, between the longitudinal and transverse ribs and the concrete, between the upper steel plate and the concrete, and between the lower steel plate and the concrete.
6. A pipe segment structure for portal construction inside a pipe jacking tunnel according to claim 5, characterized in that: The isolation layer is a silicone oil isolation layer or a polytetrafluoroethylene isolation layer.
7. A pipe segment structure for portal construction inside a pipe jacking tunnel according to claim 6, characterized in that: The temporary support is a steel support.