Plugging structure for reserved hole of open caisson

Abstract

A plugging structure for a reserved hole of an open caisson relates to the technical field of municipal engineering construction and comprises the open caisson, a reserved side wall is arranged at the position of the reserved hole of the open caisson in a plugging mode, and the reserved side wall comprises vertically-built building blocks and concrete walls symmetrically built on the two sides of the building blocks. A sandwich structure is formed between the concrete walls and the building blocks, and two-way reinforcing meshes are embedded in the two layers of concrete walls and the side wall of the original open caisson. According to the utility model, the requirement of the reserved hole for resisting water and soil pressure can be met, the requirement of construction convenience can be met, the structural stability can be improved, the construction risk can be reduced, the construction period can be shortened, and the construction cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of municipal engineering construction, in particular to a caisson reserved hole blocking structure. Background Art

[0002] Pipe jacking construction technology is a trenchless underground pipeline laying technology. Its construction principle is to use the jacking force generated by the jack and the pipe relay in the working well to overcome the friction between the pipeline and the surrounding soil layer and the pressure of the jacking surface, and push the pipe jacking machine from the working well into the receiving well. At the same time, the prefabricated pipe segments are pushed in and laid together. Pipe jacking construction technology can cross roads, rivers, bridges, tunnels, other ground buildings and various underground pipelines, which can effectively reduce the amount of demolition, does not affect people's normal life and production, has little interference with the surrounding environment, and the construction is not affected by weather and environment.

[0003] The commonly used methods for reserving the entrance and exit of the jacking pipe include pouring low-grade concrete, laying ordinary bricks, and plugging with external steel sheet piles. However, these methods have many disadvantages. First, if the pouring amount of low-grade concrete is not well controlled, it is easy for low-grade concrete to invade high-grade concrete, resulting in insufficient strength of the side wall of the caisson. In addition, the thickness of the side wall concrete is generally between 1.0 and 1.5m, and it is time-consuming and labor-intensive to open the hole after construction. Although ordinary brick masonry is easy to dismantle, the strength of bricks is much lower than that of concrete, and the integrity is poor. It cannot withstand deep water and soil pressure and is easily damaged by water seepage. Externally inserted steel sheet piles have poor tightness, and it is difficult to install steel sheet piles for areas with good geological conditions and reinforced entrances.

[0004] Therefore, when choosing a suitable method for sealing the hole, on the one hand, we must fully consider factors such as construction progress, cost, and safety; on the other hand, taking protective measures will not cause additional difficulties in subsequent pipe jacking operations. Utility Model Content

[0005] The utility model proposes a plugging structure for a reserved opening of a caisson to solve the problem of plugging the reserved opening of the caisson, and seeks a protection method that is both economical and convenient and fast to construct while meeting the requirements of caisson strength and anti-seepage.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A caisson reserved hole blocking structure comprises a caisson, wherein the reserved hole position of the caisson is blocked with a reserved side wall, the reserved side wall comprises vertically built additional blocks and concrete walls symmetrically built on both sides of the additional blocks, a sandwich structure is formed between the concrete wall and the additional blocks, and bidirectional steel meshes are embedded in the two layers of the concrete wall and the original caisson side wall.

[0008] Furthermore, the bidirectional steel mesh includes transverse steel bars and vertical steel bars. The bidirectional steel mesh is made of grade 3 steel with a diameter of 25 mm, and the spacing between adjacent steel bars is 100 mm.

[0009] Furthermore, the bidirectional steel mesh located on the reserved side wall cuts off some steel bars at intervals, the spacing between adjacent steel bars is 300 mm, and the uncut steel bars are arranged continuously.

[0010] Furthermore, the thickness of the concrete wall is 200 mm, and the concrete grade of the concrete wall is the same as the concrete grade of the caisson side wall.

[0011] Furthermore, three rows of mixing piles with a diameter of 700 mm are vertically arranged on the outer side of the side wall of the caisson to reinforce the side wall of the caisson.

[0012] Furthermore, seven rows of mixing piles with a diameter of 700 mm are vertically arranged outside the reserved hole of the caisson to reinforce the reserved hole.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model proposes a plugging structure for a reserved opening of a caisson, which includes a caisson, a reserved side wall, a concrete wall, additional blocks, and a bidirectional steel mesh. After the caisson is in place, only the inner and outer 200mm concrete walls need to be broken, and the concrete and blocks are easy to break. Therefore, the structure has high breaking efficiency, and the concrete and steel bars between the side wall and the reserved opening have consistent strength and are arranged continuously, thereby ensuring the integrity and anti-seepage effect of the caisson opening. The utility model meets the requirement of the reserved opening to resist water and soil pressure, meets the requirement of construction convenience, improves structural stability, reduces construction risks, shortens construction period, and reduces project costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 This is a schematic diagram of the reserved hole reinforcement structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the reinforcement for the reserved opening of the utility model;

[0018] Figure 3 This is a schematic diagram of the reserved hole blocking of the utility model.

[0019] In the figure: 1. Caisson, 2. Reserved side wall, 3. First mixing pile, 4. Second mixing pile, 5. Bidirectional steel mesh, 6. Concrete wall, 7. Additional blocks. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] like Figure 1-3As shown, a caisson reserved hole plugging structure includes a caisson 1, the reserved hole position of the caisson 1 is blocked with a reserved side wall 2, the reserved side wall 2 includes a vertically built additional block 7, and a concrete wall 6 symmetrically built on both sides of the additional block 7, a sandwich structure is formed between the concrete wall 6 and the additional block 7, and a bidirectional steel mesh 5 is pre-embedded in the two layers of the concrete wall 6 and the original caisson side wall. The thickness of the concrete wall 6 is 200 mm, and the concrete grade of the concrete wall 6 is the same as that of the caisson side wall.

[0025] The utility model proposes a plugging structure for a reserved opening of a caisson, which comprises a caisson 1, a reserved side wall 2, a concrete wall 6, an additional block 7, and a bidirectional steel mesh 5. After the caisson is in place, only the inner and outer 200 mm concrete walls 6 need to be broken, and the concrete additional blocks 7 are easy to break. Therefore, the structure has high breaking efficiency, and the concrete and steel bars between the side wall and the reserved opening have consistent strength and are arranged continuously, thereby ensuring the integrity and anti-seepage effect of the caisson opening. The utility model meets the requirement of the reserved opening to resist water and soil pressure, meets the requirement of construction convenience, improves structural stability, reduces construction risks, shortens construction period, and reduces project costs.

[0026] Specifically, as shown in the figure, the bidirectional steel mesh 5 includes transverse steel bars and vertical steel bars. The bidirectional steel mesh 5 is made of grade 3 steel with a diameter of 25 mm, and the spacing between adjacent steel bars is 100 mm. The bidirectional steel mesh 5 located on the reserved side wall 2 cuts off some steel bars at intervals, and the spacing between adjacent steel bars is 300 mm. The uncut steel bars are arranged continuously. The above arrangement maintains the consistency of the strength of the concrete and steel bars between the side wall and the reserved opening, and the continuous arrangement. The reserved side wall of the reserved opening is easy to remove, and the structure is simple, compact and highly practical.

[0027] Specifically, as shown in the figure, three rows of first mixing piles 3 with a diameter of 700 mm are vertically arranged on the outside of the side wall of the caisson 1 to reinforce the side wall of the caisson 1. Seven rows of second mixing piles 4 with a diameter of 700 mm are vertically arranged on the outside of the reserved hole position of the caisson 1 to reinforce the reserved hole. The first mixing piles 3 and the second mixing piles 4 are used to reinforce the hole on the one hand to resist part of the water and soil pressure; on the other hand, they serve as reinforcement bodies for the back wall to increase the recoil force.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A caisson reserved hole plugging structure, comprising a caisson (1), characterized in that: The reserved opening position of the caisson (1) is sealed with a reserved side wall (2), the reserved side wall (2) comprises a vertically built additional block (7) and a concrete wall (6) symmetrically built on both sides of the additional block (7), a sandwich structure is formed between the concrete wall (6) and the additional block (7), and a bidirectional steel mesh (5) is pre-embedded in the two layers of the concrete wall (6) and the original caisson side wall.

2. The caisson reserved hole blocking structure according to claim 1 is characterized in that: The bidirectional steel mesh (5) comprises transverse steel bars and vertical steel bars. The bidirectional steel mesh (5) is made of grade 3 steel with a diameter of 25 mm, and the spacing between adjacent steel bars is 100 mm.

3. The caisson reserved hole blocking structure according to claim 2 is characterized in that: The bidirectional steel mesh (5) located at the reserved side wall (2) cuts off some steel bars at intervals, the spacing between adjacent steel bars is 300 mm, and the uncut steel bars are arranged continuously.

4. The caisson reserved hole blocking structure according to claim 3 is characterized in that: The thickness of the concrete wall (6) is 200 mm, and the concrete grade of the concrete wall (6) is the same as the concrete grade of the caisson side wall.

5. The caisson reserved hole blocking structure according to claim 4 is characterized in that: Three rows of first stirring piles (3) with a diameter of 700 mm are vertically arranged on the outer side of the side wall of the caisson (1) to reinforce the side wall of the caisson (1).

6. The caisson reserved hole plugging structure according to claim 5, characterized in that: Seven rows of second mixing piles (4) with a diameter of 700 mm are vertically arranged outside the reserved hole position of the caisson (1) to reinforce the reserved hole.

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