Assembling type rear backrest wall structure of electric power tunnel jacking pipe
By adopting a combined structure of assembled steel sections and steel plates in the construction of power tunnels, the problem of rear back wall arrangement when the receiving shaft is changed to the starting shaft is solved, the uniform transmission of jacking force and rapid construction are achieved, and stability and safety are improved.
Patent Information
- Application Number
- CN202422456003.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-10-11
AI Technical Summary
During the construction of a power tunnel, when the receiving shaft is changed to the starting shaft, the difficulty in arranging the rear back wall causes the jacking construction to stagnate. In addition, the existing technology cannot effectively transmit the jacking thrust of the jacking, which damages the already penetrated pipe sections.
An assembled steel and steel plate combination structure is designed, including left and right vertical frames, a horizontal frame and a rear backrest. By installing vertical and horizontal steel sections on both sides of the reserved pipe section that has been penetrated and covered with steel plates, a support reaction force is formed to evenly transmit the top thrust.
The jacking force is evenly transmitted to the structural walls on both sides of the penetrated pipe section, avoiding damage, making the materials easy to turnover and utilize, and the construction is fast with good stability and safety.
Smart Images
Figure CN223329883U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to pipe jacking construction, in particular to the field of pipe jacking construction of underground concealed power tunnels. Background Art
[0002] With the acceleration of urbanization, the trend of the times is to change power lines from traditional overhead to underground (from above to below), so power tunnels have been widely built. However, in urban environments, power tunnels are often built using existing ground road green belts and cross crossroads, rivers, etc. Road traffic is generally busy, underground pipelines are densely distributed, and the surrounding environment is complex. Therefore, power tunnels are mostly constructed using the jacking method. A key operation in the jacking method is the construction of the working shaft, including the starting shaft and the receiving shaft. The production of the back wall of the starting shaft is one of the important links in the jacking construction, and its quality is directly related to the stability of the jacking and the construction effect. Therefore, the back wall of the starting shaft is specially designed in advance, and the embedded parts are embedded in time during the construction of the working shaft.
[0003] However, the relatively large size and depth of the working well often hinders construction due to the narrow construction conditions on site. If the launch well cannot be successfully commenced, pipe jacking construction will stall. Therefore, to ensure overall project progress, pipe jacking is often shifted from the receiving well to the launching well. In this case, the back wall constructed in the receiving well is located directly above the reserved position for the already penetrated pipe section on the opposite side, directly posing the challenge of constructing the back wall required for the receiving well to function as the launching well. Utility Model Content
[0004] In view of the fact that a receiving well that has been constructed by the jacking method is changed to a starting well, the utility model designs a steel-assembled jacking pipe back-rest wall structure, which can better and evenly transmit the jacking thrust reaction force to the structural walls on both sides of the reserved pipe section that has been penetrated, avoiding damage to the penetrated pipe section. In addition, the steel and steel plate back-rest structure materials are easy to obtain and convenient for turnover and utilization, the construction process is simple and mature, the construction is fast, and the stability and safety of the back-rest wall are good.
[0005] The utility model provides an assembled rear back wall structure for a power tunnel jacking pipe. The back wall structure is installed on the outer side of the receiving well wall of the reserved pipe section that has been penetrated. The back wall structure includes:
[0006] A left vertical frame and a right vertical frame, wherein the left vertical frame and the right vertical frame are respectively installed on the left well wall and the right well wall of the reserved pipe section, and the left vertical frame and the right vertical frame each comprise a plurality of vertical steel plates arranged in parallel, and the steel plates are welded to the left well wall and the right well wall;
[0007] A transverse frame, which is laid above the reserved pipe section, and has its left and right ends welded to the left vertical frame and the right vertical frame respectively. The transverse frame includes a plurality of parallel transverse steel plates, which are welded and fixed to the vertical steel plates.
[0008] A rear backrest, the rear backrest covering the top of the transverse frame and being welded and fixed to the transverse frame;
[0009] At least two jacking pipe jacks are suitable for being vertically arranged on the rear backrest.
[0010] In some embodiments, the length of the reserved pipe section that has penetrated and is reserved outside the well wall is maintained at 300 mm to 400 mm.
[0011] In some embodiments, the length of the vertical steel plate is the outer diameter of the top pipe segment + 1500 mm.
[0012] In some embodiments, both left and right ends of the transverse steel plate are 80 mm wider than the outermost vertical steel plate.
[0013] In some embodiments, the backrest is a steel plate with a thickness of 20 mm.
[0014] In some embodiments, the vertical steel plates and the transverse steel plates are both H-shaped steels.
[0015] The utility model provides a support reaction force for the pipe jacking jack by vertically installing full-length steel sections on both sides of the reserved pipe section that has been penetrated, then horizontally welding steel sections along the hole section (the reserved pipe opening has been completed) and covering them with thick steel plates. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 and Figure 2 This is a schematic diagram of the assembled rear backrest elevation (the large frame drawn outside the reference figure represents the receiving shaft wall)
[0017] Figure 3 This is a top view of an example application of a assembled rear backrest;
[0018] Figure 4 and Figure 5 Schematic diagram of the assembled rear back wall structure
[0019] Among them, 1-receiving well wall; 2-reserved pipe section that has been penetrated; 3-receiving well lining structural wall; 4-receiving well underground continuous wall; 5-vertical steel plate; 6-horizontal steel plate; 7-rear backrest; 8-jack; 9-vertical welding fixing point; 10-horizontal steel welding point; 11-covering steel plate and horizontal steel welding point. DETAILED DESCRIPTION
[0020] See also Figure 3、 Figure 4 and Figure 5 The utility model provides an assembled rear back wall structure for a power tunnel jacking pipe, the back wall structure is installed on the outer side of the receiving shaft wall 1 of the reserved pipe section 2 that has been penetrated, the back wall structure includes a left vertical frame and a right vertical frame, a horizontal frame, a rear back 7 and a jack 8; the left vertical frame and the right vertical frame are respectively installed on the left and right shaft walls of the reserved pipe section, the left vertical frame and the right vertical frame each include a plurality of parallel vertical steel plates 5, the steel plates 5 are welded to the left and right shaft walls; the horizontal frame is laid above the reserved pipe section, and its left and right ends are respectively welded to the left vertical frame and the right vertical frame, the horizontal frame includes a plurality of parallel horizontal steel plates 6, the horizontal steel plates are welded and fixed to the vertical steel plates; the rear back 7 covers the top of the horizontal frame and is welded and fixed to the horizontal frame; the two jacking pipe jacks 8 are suitable for being vertically arranged on the rear back 7. After vertically installing full-length steel sections on both sides of the reserved pipe section that has been penetrated, the steel sections are horizontally welded along the opening section (the reserved pipe opening has been completed) and covered with thick steel plates as a backrest to provide support reaction force for the jacking pipe jack.
[0021] Aiming at the problem of rear backrest arrangement of jacks when the receiving well is changed to the starting well during the construction of power tunnel jacking method, the present invention proposes an assembled steel and steel plate combined structure, which can better and evenly transmit the thrust reaction force of the jacking pipe to the structural walls on both sides of the reserved pipe section that has been penetrated, avoiding damage to the penetrated pipe section. In addition, the steel and steel plate rear backrest structure materials are easy to obtain and convenient for turnover and utilization, the construction process is simple and mature, the construction is fast, and the stability and safety of the rear backrest wall are good.
[0022] Illustratively, this embodiment provides a construction method for an assembled rear back wall structure, the method comprising the following steps:
[0023] The length of the reserved pipe section 2 on the receiving well side of the proposed back wall of the jacking pipe should be kept at 300mm to 400mm. When designing the assembled back wall structure, the size, depth and stability of the jacking pipe and the overall force calculation of the longitudinal and transverse steel sections of the back wall should be considered. The technical solution is as follows: Step 1, please refer to Figure 1 First, install four 400×400×13×21H-shaped steels (vertical steel plates 5) vertically on both sides of the reserved pipe segment. The length is the outer diameter of the top pipe segment + 1500mm. They are tightly attached to the well wall structure and fixed by welding. Figure 2, along the reserved pipe section, 400×400×13×21H steel (transverse steel plate 6) is fully laid perpendicular to the vertical steel sections on both sides. The outer wing plate connections are welded and fixed. Each end is 80mm wider than the outermost vertical steel sections on both sides. The third step is to cover the entire track with a 20mm thick steel plate (rear backrest 7) after the transverse steel sections are installed. Both the steel plate and the steel section are made of Q235 material and are effectively welded and fixed. When installing the rear backrest, maintain a certain slope so that the facade is at a vertical angle to the jack bracket. That is, the longitudinal slope of the jack bracket should be consistent with the track installation slope (designed pipeline slope).
[0024] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. An assembled rear back wall structure for a power tunnel jacking pipe, characterized in that: The back wall structure is installed on the outside of the receiving well wall of the reserved pipe section that has been penetrated. The back wall structure includes: A left vertical frame and a right vertical frame, wherein the left vertical frame and the right vertical frame are respectively installed on the left well wall and the right well wall of the reserved pipe section, and the left vertical frame and the right vertical frame each comprise a plurality of vertical steel plates arranged in parallel, and the steel plates are welded to the left well wall and the right well wall; A transverse frame, which is laid above the reserved pipe section, and has its left and right ends welded to the left vertical frame and the right vertical frame respectively. The transverse frame includes a plurality of parallel transverse steel plates, which are welded and fixed to the vertical steel plates. A rear backrest, the rear backrest covering the top of the transverse frame and being welded and fixed to the transverse frame; At least two jacking pipe jacks are suitable for being vertically arranged on the rear backrest.
2. The assembled rear back wall structure of the power tunnel jacking pipe according to claim 1, characterized in that: The length of the reserved pipe section that has been passed through and reserved outside the well wall is maintained at 300mm to 400mm.
3. The assembled rear back wall structure of the power tunnel jacking pipe according to claim 1, characterized in that: The length of the vertical steel plate is the outer diameter of the top pipe segment + 1500mm.
4. The assembled rear back wall structure of the power tunnel jacking pipe according to claim 1, characterized in that: The left and right ends of the transverse steel plate are both 80 mm wider than the outermost vertical steel plate.
5. The assembled rear back wall structure of the power tunnel jacking pipe according to claim 1, characterized in that: The backrest is a steel plate with a thickness of 20 mm.
6. The assembled rear back wall structure of the power tunnel jacking pipe according to claim 1, characterized in that: The backrest has a slope.
7. The assembled rear back wall structure of the power tunnel jacking pipe according to claim 1, characterized in that: The vertical steel plates and the horizontal steel plates are both H-shaped steels.