An underground box-type composite wall structure and a method of implementing the same

Abstract

The application discloses an underground box-type combined wall structure and an implementation method thereof, and comprises a structural inner wall, an underground continuous wall, a horizontal beam, a reverse construction vertical column and a waterproof roll. The outer side of the structural inner wall is provided with the underground continuous wall, the inner side wall of the underground continuous wall is circumferentially provided with the horizontal beam, the reverse construction vertical column is vertically arranged between the underground continuous wall and the structural inner wall, and the outer side of the structural inner wall is paved with the waterproof roll. The underground box-type combined wall structure and the implementation method thereof rigidly connect the structural inner wall and the underground continuous wall by the reverse construction vertical column, form a box-type structural wall body composed of the underground continuous wall, the structural inner wall and the reverse construction vertical column, and have large overall structural lateral stiffness and high bearing capacity. Compared with a traditional 'off-wall outer wall', the underground continuous wall is used as a permanent structure in the technology, the structural cost is reduced, and the waterproof effect is better than that of a traditional 'composite' or'superimposed' outer wall.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to an underground box-type composite wall structure and its implementation method. Background Technology

[0002] Cylindrical underground shaft structures without a central slab have vertically arranged cylindrical structural walls. Except for the bottom slab, there are no other internal slabs, resulting in a large internal space. This type of structure is widely used in deep-buried tunnel working shafts, large petrochemical storage tanks, and other fields. In soft soil areas, when the underground shaft is deep, a circular diaphragm wall 2 is generally used as the foundation pit support structure. In existing technologies, the arrangement relationship between the main structural walls of the basement and the foundation pit support diaphragm wall 2 mainly includes three types: "detached exterior wall," "composite wall," and "overlapping wall."

[0003] (1) In the "detached exterior wall" type, there is a groove between the main structural wall and the underground diaphragm wall 2, allowing waterproofing material to be laid on the water-facing side of the main structural wall, resulting in good waterproofing. However, the underground diaphragm wall 2 in the "detached exterior wall" type is only used as a temporary support structure and does not share the load during the permanent use phase, while the load during the permanent use phase is entirely borne by the main structural wall. For cylindrical underground shaft structures without a middle slab, due to the lack of a middle floor slab, the main structural wall is in a cantilever state above the bottom slab, and the wall thickness is generally large. If the underground diaphragm wall 2 is not used as a permanent structure, the construction cost of the main structural wall will increase significantly. Therefore, the construction cost of the "detached exterior wall" type is also the highest.

[0004] (2) The diaphragm wall 2 of the "composite wall" and "overlapping wall" can bear part of the load during the permanent use phase. However, because the main structural wall is arranged in close proximity to the diaphragm wall 2, it is impossible to apply the flexible waterproofing material to the water-facing side of the main structural wall (i.e., waterproofing cannot be done directly). During construction, the flexible waterproofing material can only be applied to the back side of the diaphragm wall 2 (i.e., waterproofing can only be done in reverse), which greatly weakens the effectiveness of the waterproofing material. In addition, during the curing period, the main structural wall of the "composite wall" and "overlapping wall" cannot freely shrink due to the constraint of the diaphragm wall 2, and structural wall cracks often appear. Therefore, the waterproofing effect of the "composite wall" and "overlapping wall" is generally worse than that of the "detached wall".

[0005] In summary, the waterproofing quality of "detached exterior walls" is relatively reliable but the construction cost is high, while "composite walls" and "overlapping walls" have lower construction costs but poor waterproofing performance. Therefore, this invention provides an underground box-type composite wall structure suitable for cylindrical underground structures without a central slab. This structure can utilize the underground wall as a permanent structure to save costs, enhance the waterproofing effect of the structural wall, and improve the horizontal seismic performance of the wall. Summary of the Invention

[0006] The purpose of this invention is to provide an underground box-type composite wall structure and its implementation method, so as to solve the problem in the background art that the waterproof quality of "detached exterior wall" is more reliable but the construction cost is high, while "composite wall" and "overlapping wall" have lower construction costs but poor waterproof effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an underground box-type composite wall structure and its implementation method, comprising: an inner structural wall, a diaphragm wall, a horizontal beam, reverse-construction vertical columns, and a waterproof membrane. The outer side of the inner structural wall is provided with a diaphragm wall, the inner sidewall of the diaphragm wall is provided with a horizontal beam circumferentially, and a reverse-construction vertical column is arranged vertically between the diaphragm wall and the inner structural wall. The outer side of the inner structural wall is covered with a waterproof membrane.

[0008] Preferably, the diaphragm wall is arranged along the edge of the circular foundation pit and is composed of multiple sections, with a diaphragm wall section partition opened between each adjacent diaphragm wall.

[0009] Preferably, the diaphragm wall and the reverse-construction vertical column are connected by a first steel bar connector, the diaphragm wall and the horizontal beam are connected by a second steel bar connector, the structural inner wall and the reverse-construction vertical column are connected by a third steel bar connector, and water-stop grooves are provided on both sides of the reverse-construction vertical column.

[0010] Preferably, the waterproof membrane is arranged on the outside of the inner wall of the structure, and both ends of the waterproof membrane extend into the water-stop groove of the reverse vertical column and are sealed with sealant.

[0011] Preferably, a gap is provided between the inner wall of the structure and the underground continuous wall, and the net distance between the inner wall of the structure and the underground continuous wall is not less than 2m. The gap is filled with a flexible gap backfill material.

[0012] Preferably, the flexible filler for the gap backfill can be plastic foam, rubber blocks, or inflatable cushions.

[0013] Preferably, the bottom of the inner wall and the reverse vertical column of the structure is fixedly connected to a structural base plate.

[0014] Preferably, an underground box-type composite wall structure and its implementation method include the following steps:

[0015] S1. Construct a diaphragm wall along the edge of the circular foundation pit;

[0016] S2. Excavate the foundation pit, and construct the vertical columns and horizontal beams in reverse order during excavation. The vertical columns and horizontal beams are connected to the diaphragm wall via steel connectors;

[0017] S3. Excavate to the bottom of the pit and construct the structural base slab;

[0018] S4. Construct the structural interior wall inside the foundation pit, and connect the structural interior wall to the reverse-construction vertical column through a steel bar connector;

[0019] S5. Lay waterproof membrane on the outside of the interior wall of the structure, with the ends of the waterproof membrane set at the water-stop grooves on both sides of the reverse vertical column, and apply sealant to the ends of the waterproof membrane.

[0020] S6. Backfill the gap between the diaphragm wall and the structural interior wall with flexible filler material.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This underground box-type composite wall structure and its implementation method utilize reverse-construction vertical columns to rigidly connect the structural interior walls with the underground diaphragm wall, forming a box-type structural wall composed of the underground diaphragm wall, structural interior walls, and reverse-construction vertical columns. The overall structure has high lateral stiffness and high load-bearing capacity. Compared with the traditional "detached exterior wall," this technology utilizes the underground diaphragm wall as a permanent structure, reducing structural costs.

[0023] 2. The underground box-type composite wall structure and its implementation method involve installing waterproof membrane on the outside of the inner wall and setting water-stop grooves on the vertical columns, which enhances the overall waterproof performance of the structural wall. Compared with traditional "composite wall" and "overlapping wall" technologies, the waterproof effect is better.

[0024] 3. This underground box-type composite wall structure and its implementation method involve filling the gap between the underground continuous wall and the structural interior wall with flexible infill material. Under horizontal seismic loads, the flexible infill material can absorb horizontal seismic energy and reduce seismic damage response. Therefore, this technology can improve the horizontal seismic performance of the wall. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the planar structure of the box-type wall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the box-type wall structure of the present invention;

[0027] Figure 3 This is a partially enlarged structural schematic diagram of the present invention;

[0028] Figure 4 This is a top-view enlarged structural schematic diagram of the present invention;

[0029] Figure 5 This is a schematic diagram of the enlarged AA structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the enlarged BB structure of the present invention.

[0031] In the diagram: 1. Structural interior wall; 2. Diaphragm wall; 22. Diaphragm wall section; 31. Horizontal beam; 32. Reverse vertical column; 4. Gap; 5. Waterproof membrane; 51. Sealant; 61. First rebar connector; 62. Second rebar connector; 63. Third rebar connector; 7. Structural base plate. Detailed Implementation

[0032] 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.

[0033] Please see Figure 1-6 The present invention provides a technical solution: an underground box-type composite wall structure and its implementation method, comprising: an inner structural wall 1, an underground continuous wall 2, a horizontal beam 31, a reverse-construction vertical column 32, and a waterproof membrane 5. The outer side of the inner structural wall 1 is provided with an underground continuous wall 2, the inner side wall of the underground continuous wall 2 is circumferentially provided with a horizontal beam 31, and a reverse-construction vertical column 32 is vertically arranged between the underground continuous wall 2 and the inner structural wall 1. The outer side of the inner structural wall 1 is covered with a waterproof membrane 5.

[0034] The underground diaphragm wall 2 is arranged along the edge of the circular foundation pit and is composed of multiple sections. Each adjacent underground diaphragm wall 2 is separated by an underground diaphragm wall section 22. The segmented diaphragm walls can be spliced ​​together to form an integral underground diaphragm wall 2.

[0035] The diaphragm wall 2 and the reverse vertical column 32 are connected by a first steel bar connector 61, the diaphragm wall 2 and the horizontal beam 31 are connected by a second steel bar connector 62, and the structural inner wall 1 and the reverse vertical column 32 are connected by a third steel bar connector 63. Water-stop grooves are provided on both sides of the reverse vertical column 32.

[0036] Waterproof membrane 5 is placed on the outside of the inner wall of the structure. Both ends of the waterproof membrane 5 extend into the water-stop groove of the reverse vertical column and are sealed with sealant 51.

[0037] A gap 4 is provided between the structural interior wall 1 and the underground continuous wall 2. The net distance of the gap 4 between the structural interior wall 1 and the underground continuous wall 2 is not less than 2m. The gap 4 is filled with a flexible backfill material. The flexible backfill material can increase the horizontal seismic resistance of the structural interior wall 1.

[0038] Flexible fillers for void backfilling can include plastic foam, rubber blocks, and inflatable cushions.

[0039] The bottom of the structural inner wall 1 and the reverse vertical column 32 are fixedly connected to the structural base plate 7. The structural base plate 7 can be used as a sealing structure and is set at the bottom of the structural inner wall 1 and the reverse vertical column 32.

[0040] An underground box-type composite wall structure and its implementation method include the following construction steps:

[0041] S1. Construct the underground continuous wall 2 along the edge of the circular foundation pit;

[0042] S2. Excavate the foundation pit, and construct the vertical columns 32 and horizontal beams 31 in reverse order during excavation. The vertical columns 32 and horizontal beams 31 are connected to the underground continuous wall 2 via steel reinforcement connectors;

[0043] S3. Excavate to the bottom of the pit and construct the structural base slab 7;

[0044] S4. Construct structural inner wall 1 inside the foundation pit. Structural inner wall 1 is connected to the reverse vertical column 32 through a steel bar connector.

[0045] S5. A waterproof membrane 5 is laid on the outside of the inner wall 1 of the structure. The ends of the waterproof membrane 5 are set at the water-stop grooves on both sides of the reverse vertical column 32. A sealant 51 is applied to the ends of the waterproof membrane 5.

[0046] S6. Backfill the gap 4 between the underground continuous wall 2 and the structural inner wall 1 with flexible filler material.

[0047] 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. An underground box-type composite wall structure, comprising: The structure includes an inner wall (1), a diaphragm wall (2), a horizontal beam (31), a reverse-construction column (32), and a waterproof membrane (5). The structure is characterized in that: a diaphragm wall (2) is provided on the outer side of the inner wall (1), a horizontal beam (31) is provided circumferentially on the inner side wall of the diaphragm wall (2), and a reverse-construction column (32) is arranged vertically between the diaphragm wall (2) and the inner wall (1). A waterproof membrane (5) is laid on the outer side of the inner wall (1). The underground continuous wall (2) and the reverse vertical column (32) are connected by a first steel bar connector (61), the underground continuous wall (2) and the horizontal beam (31) are connected by a second steel bar connector (62), the structural inner wall (1) and the reverse vertical column (32) are connected by a third steel bar connector (63), and the reverse vertical column (32) is provided with water-stop grooves on both sides.

2. The underground box-type composite wall structure according to claim 1, characterized in that: The underground continuous wall (2) is arranged along the edge of the circular foundation pit and is composed of multiple trench sections. Each adjacent underground continuous wall (2) is provided with an underground continuous wall trench section (22).

3. The underground box-type composite wall structure according to claim 1, characterized in that: The waterproof membrane (5) is arranged on the outside of the inner wall of the structure, and the two ends of the waterproof membrane (5) extend into the water-stop groove of the reverse vertical column and are sealed with sealant (51).

4. The underground box-type composite wall structure according to claim 1, characterized in that: A gap (4) is provided between the inner wall (1) of the structure and the underground continuous wall (2). The net distance between the gap (4) between the inner wall (1) of the structure and the underground continuous wall (2) is not less than 2m. The gap (4) is filled with a flexible backfill material.

5. The underground box-type composite wall structure according to claim 4, characterized in that: The flexible filler material for the void backfill can be plastic foam, rubber blocks, or inflatable cushions.

6. The underground box-type composite wall structure according to claim 1, characterized in that: The bottom of the structural inner wall (1) and the reverse vertical column (32) are fixedly connected to the structural base plate (7).

7. A method for implementing an underground box-type composite wall structure, characterized in that: Using any one of the underground box-type composite wall structures described in claims 1-6 includes the following steps: S1. Construct a diaphragm wall along the edge of the circular foundation pit (2); S2. Excavate the foundation pit, and construct vertical columns (32) and horizontal beams (31) in reverse as the excavation progresses. The vertical columns (32) and horizontal beams (31) are connected to the underground continuous wall (2) through steel connectors. S3. Excavate to the bottom of the pit and construct the structural base plate (7). S4. Construct the structural inner wall (1) inside the foundation pit. The structural inner wall (1) is connected to the reverse vertical column (32) through the first steel bar connector (61). S5. A waterproof membrane (5) is laid on the outside of the inner wall (1) of the structure. The ends of the waterproof membrane (5) are set at the water-stop grooves on both sides of the reverse vertical column (32). A sealant (51) is set at the ends of the waterproof membrane (5). S6. Backfill the gap (4) between the underground continuous wall (2) and the structural inner wall (1) with flexible filler.

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