Underground rectangular box culvert jacking pre-reinforcing structure
By setting up a pipe curtain structure and a full-section horizontal grouting structure in the rectangular box culvert, an M-shaped reinforced section structure is formed, which solves the problem of road surface settlement during the ejection process, significantly reduces ground settlement and improves construction stability, while isolating groundwater.
Patent Information
- Application Number
- CN202421361616.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-14
AI Technical Summary
When the thickness of the top pipe cover does not meet the requirements, the risk of road surface settlement is prone to occur during the roll-in process of the rectangular box culvert, resulting in disturbance and deformation of the roadbed and collapse of underground pipelines, which may cause ground traffic interruption and safety accidents.
An underground rectangular box culvert suction pre-reinforced structure is adopted, including a pipe curtain structure and a full-section horizontal grouting structure. The pipe curtain structure is composed of multiple pipe curtain steel pipes, forming a structure with an M-shaped cross-section and fixedly connected by channel steel buckles; the full-section horizontal grouting structure is arranged in each rectangular box concave.
Through this pre-reinforced structure, the ground settlement is significantly reduced during the subsequent ejection of the rectangular box culvert, and the stability of the excavation surface is greatly increased during construction. At the same time, the pipe curtain structure has the function of isolating groundwater, avoiding the need to lower groundwater levels and simplifying the construction process.
Smart Images
Figure CN222862111U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technology in the field of engineering construction, in particular to an underground rectangular box culvert jacking pre-reinforcement structure. Background Art
[0002] With economic development, population growth, and the continuous expansion of cities, traffic has become increasingly congested. In order to alleviate the increasing traffic pressure, more and more interchange structures appear in cities. Underpasses are a common form of interchanges, and most of the tunnels are large-section rectangular box culverts.
[0003] In order not to affect the surrounding environment and existing traffic, pipe jacking construction technology is often required. Generally speaking, the construction of jacking requires that the thickness of the soil layer on the top of the box culvert should be greater than 1.5 times the height of the box culvert. However, when the soil covering the pipe is relatively shallow, the risk of road subsidence during the jacking of the box culvert is very high, which can easily cause roadbed disturbance deformation and underground pipeline collapse, thereby causing ground traffic interruption and safety accidents. When the thickness of the soil covering the pipe does not meet the requirements, the reinforcement structure before jacking is a factor that needs to be considered in the pipe jacking project. At present, there is no effective solution to avoid the risk of road subsidence, so it is necessary to study a solution to solve the above problems. Utility Model Content
[0004] In view of this, the utility model aims to solve the deficiencies in the prior art, and its main purpose is to provide an underground rectangular box culvert jacking pre-reinforcement structure, which can effectively solve the problem of road surface settlement risk that may occur when the thickness of the jacking pipe cover does not meet the requirements.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] An underground rectangular box culvert jacking pre-reinforcement structure is arranged between two adjacent rectangular box culverts, and includes a pipe curtain structure and a full-section horizontal grouting structure; the pipe curtain structure includes a plurality of pipe curtain steel pipes, and the plurality of pipe curtain steel pipes are distributed on the left and right sides and the upper side of each rectangular box culvert, each pipe curtain steel pipe extends along the length direction of the rectangular box culvert, and two adjacent pipe curtain steel pipes are fixedly connected, and the plurality of pipe curtain steel pipes form a structure with an M-shaped cross section; the full-section horizontal grouting structure is arranged in each rectangular box culvert.
[0007] Preferably, the two adjacent pipe-roof steel pipes are fixedly connected by two pairs of channel steel lock buckles, and each channel steel is welded and fixed on the pipe-roof steel pipe.
[0008] Preferably, the channel steel is 8# channel steel.
[0009] Preferably, the outer diameter of the pipe-curtain steel pipe is 300 mm, and the thickness of the pipe-curtain steel pipe is 12 mm.
[0010] Preferably, a grouting pipe is welded to the outer side of the pipe-roof steel pipe.
[0011] Preferably, the outer diameter of the grouting pipe is 32 mm, and the grouting pipe is a seamless steel pipe.
[0012] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:
[0013] By setting up a pipe curtain structure, using multiple pipe curtain steel pipes of the pipe curtain structure to form an M-shaped cross-section structure, and coordinating with a full-section horizontal grouting structure to form an M-shaped reinforced cross-section structure, the ground settlement in the subsequent jacking of the rectangular box culvert can be significantly reduced, and the stability of the excavation surface during construction is also greatly increased. At the same time, since the pipe curtain structure has the function of isolating groundwater, there is no need to lower the groundwater level during construction, which brings convenience to the construction work. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a longitudinal cross-sectional view of a preferred embodiment of the utility model;
[0015] Figure 2 It is a transverse cross-sectional view of a preferred embodiment of the utility model;
[0016] Figure 3 yes Figure 2 Enlarged schematic diagram of position A in the middle.
[0017] Description of the accompanying drawings:
[0018] 10. Rectangular box culvert 20. Pipe curtain structure
[0019] 21. Pipe curtain steel pipe 22. Channel steel
[0020] 23. Grouting pipe 30. Full-section horizontal grouting structure
[0021] 41. Retaining wall 42. Gate structure
[0022] 43. Rebar implantation DETAILED DESCRIPTION
[0023] Please refer to Figures 1 to 3 As shown, it shows the specific structure of a preferred embodiment of the utility model, which is arranged between two adjacent rectangular box culverts 10 and includes a pipe curtain structure 20 and a full-section horizontal grouting structure 30.
[0024] The pipe curtain structure 20 includes a plurality of pipe curtain steel pipes 21, which are distributed on the left and right sides and the upper side of each rectangular box culvert 10. Each pipe curtain steel pipe 21 extends along the length direction of the rectangular box culvert 10. Two adjacent pipe curtain steel pipes 21 are fixedly connected, and a plurality of pipe curtain steel pipes 21 form a structure with an M-shaped cross section. In this embodiment, the two adjacent pipe curtain steel pipes 21 are fixedly connected by two pairs of channel steels 22, and each channel steel 22 is welded and fixed on the pipe curtain steel pipe 21. The channel steel 22 is 8# channel steel. The outer diameter of the pipe curtain steel pipe 21 is 300mm, and the thickness of the pipe curtain steel pipe 21 is 12mm. A grouting pipe 23 is welded on the outside of the pipe curtain steel pipe 21. The outer diameter of the grouting pipe 23 is 32mm, and the grouting pipe 23 is a seamless steel pipe.
[0025] The full-section horizontal grouting structure 30 is disposed in each rectangular box culvert 10 .
[0026] The construction process of this embodiment is described in detail as follows:
[0027] First, the soil is subjected to full-section horizontal grouting to form a full-section horizontal grouting structure 30. The full-section horizontal grouting uses a single-liquid cement slurry with a water-cement ratio of 1:0.85 to 1:1.25, and the grouting pressure is controlled between 0.5 and 1.0 MPa. After the construction of the pipe curtain working well is completed, the center line of the pipe curtain is marked on the retaining wall 41, and the retaining wall 41 at the pipe curtain construction position is cored and removed by a water drill; then the horizontal spiral drill is used to construct the pipe curtain, and the first pipe curtain steel pipe 21 is driven by a laser guidance system. After the single pipe curtain steel pipe 21 is driven, the horizontal spiral drill is moved, and the channel steel 22 is welded on the pipe curtain steel pipe 21, and the pipe curtain steel pipe 21 is driven in along the previous one until the pipe curtain structure 20 is completed; then self-compacting concrete is poured into the pipe curtain steel pipe 21 and grouting is performed in the grouting pipe 23; finally, the portal structure 42 is constructed and connected to the existing retaining wall 41 as a whole through the embedded reinforcement 43; finally, an M-shaped reinforced section structure is formed. After this reinforcement mechanism is used, the ground settlement can be significantly reduced during the subsequent jacking of the rectangular box culvert 10, and the stability of the excavation surface during construction is also greatly increased. At the same time, since the pipe curtain structure 20 has the function of isolating groundwater, there is no need to lower the groundwater level during construction.
[0028] The design focus of the utility model is: by setting up a pipe curtain structure, using multiple pipe curtain steel pipes of the pipe curtain structure to form a structure with an M-shaped cross section, and coordinating with a full-section horizontal grouting structure to form an M-shaped reinforced cross-section structure, the ground settlement in the subsequent jacking of the rectangular box culvert can be significantly reduced, and the stability of the excavation surface during construction is also greatly increased. At the same time, since the pipe curtain structure has the function of isolating groundwater, there is no need to lower the groundwater level during construction, which brings convenience to the construction work.
[0029] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.
Claims
1. An underground rectangular box culvert jacking pre-reinforcement structure, characterized in that: It is arranged between two adjacent rectangular box culverts, and includes a pipe curtain structure and a full-section horizontal grouting structure; the pipe curtain structure includes a plurality of pipe curtain steel pipes, which are distributed on the left and right sides and the upper side of each rectangular box culvert, and each pipe curtain steel pipe extends along the length direction of the rectangular box culvert, and the adjacent two pipe curtain steel pipes are fixedly connected, and the plurality of pipe curtain steel pipes constitute a structure with an M-shaped cross section; the full-section horizontal grouting structure is arranged in each rectangular box culvert.
2. The underground rectangular box culvert jacking pre-reinforcement structure according to claim 1, characterized in that: The two adjacent pipe-curtain steel pipes are fixedly connected by two pairs of channel steel lock buckles, and each channel steel is welded and fixed on the pipe-curtain steel pipe.
3. The underground rectangular box culvert jacking pre-reinforcement structure according to claim 2, characterized in that: The channel steel is 8# channel steel.
4. The underground rectangular box culvert jacking pre-reinforcement structure according to claim 1, characterized in that: The outer diameter of the pipe-curtain steel pipe is 300 mm, and the thickness of the pipe-curtain steel pipe is 12 mm.
5. The underground rectangular box culvert jacking pre-reinforcement structure according to claim 1, characterized in that: A grouting pipe is welded to the outer side of the pipe-roof steel pipe.
6. The underground rectangular box culvert jacking pre-reinforcement structure according to claim 5, characterized in that: The outer diameter of the grouting pipe is 32 mm, and the grouting pipe is a seamless steel pipe.