A deep foundation pit enclosure support structure

Abstract

The utility model discloses a kind of deep foundation pit enclosure support structure system, including concrete support grid (1), steel lattice column (2), soil slope (3), steel trestle (4), concrete crown beam (5), concrete bored pile (6), cement soil mixing pile (7), stand column (8) and pit bottom (9).The utility model is provided with large opening concrete support grid (1), controls deep foundation pit deformation, ensures deep foundation pit construction safety, simultaneously make deep foundation pit middle part have large-area earthwork excavation construction surface, along pit edge setting steel trestle (4), and setting soil slope (3), form the transportation channel of earthwork excavation, can smoothly bidirectional traffic earth-moving vehicle (10), significantly improve the earthwork engineering's earth speed, shorten construction period;And the stiffness of the enclosure structure of the steel trestle side that detained soil slope significantly enhances, reduces foundation pit deformation, further ensures construction safety, produces good comprehensive benefit.

Description

Technical Field

[0001] This utility model relates to the field of underground structure construction technology in building engineering, and in particular to a deep foundation pit retaining support structure system. Background Technology

[0002] With the rapid development of the modern construction industry, developers are increasingly emphasizing the utilization of underground space. To obtain the largest possible basement area, the basement's exterior walls are often positioned close to the land parcel boundary, resulting in the deep foundation pit retaining structure being tightly attached to the boundary. This type of underground engineering design restricts the construction of underground structures to the conditions of the surrounding adjacent land parcels, ensuring that underground pipelines outside the land parcel boundary are not damaged by deformation of the deep foundation pit. When using concrete internal support structures for retaining the foundation, and with few (or even only one) excavation openings, the excavation speed of underground earthwork becomes extremely slow, severely impacting the construction schedule.

[0003] Therefore, it is urgent for those skilled in the art to research and develop deep foundation pit retaining support structure systems that are conducive to optimizing earthwork transportation routes, significantly improving the excavation speed of underground structure earthwork projects, and ensuring reasonable stress distribution and construction safety of the retaining structure. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the existing technology and provide a deep foundation pit retaining support structure system.

[0005] The technical solution provided by this utility model is as follows: A deep foundation pit retaining support structure includes a concrete support grid, steel lattice columns, an earth slope, a steel trestle bridge, a concrete capping beam, concrete cast-in-place piles, cement-soil mixing piles, column piles, and a pit bottom. The concrete cast-in-place piles are arranged around the perimeter of the deep foundation pit, and their tops are integrally cast with the concrete capping beam. The cement-soil mixing piles are arranged outside the concrete cast-in-place piles and connected to them via cement-soil. The concrete support grid is integrally cast with the concrete capping beam. The steel trestle bridge is arranged on the upper part of the concrete support grid along the side of the deep foundation pit entrance. The earth slope is arranged at the opening of the concrete support grid, with its upper end connected to the steel trestle bridge and its lower end connected to the pit bottom. The upper part of the steel lattice columns is integrally connected with the concrete support grid, and its lower part is integrally cast with the column piles. The column piles are cast in the earthwork at the bottom of the deep foundation pit.

[0006] Preferably, the concrete support grid is arranged in multiple rows along the vertical direction of the deep foundation pit; the concrete support grid is constructed from main support beams and secondary support beams into a system of several triangular grid units.

[0007] Preferably, the steel lattice column is welded from steel sections and steel gusset plates, and the steel trestle section is also provided with steel support plates; the steel lattice column is arranged along the intersection of the main supporting beam and the secondary supporting beam.

[0008] Preferably, the slope of the earthen slope is controlled at 1:10-1:11, and the slope width is 6-6.5m.

[0009] Preferably, the steel trestle is constructed by welding or bolting together the main beam, secondary beam, and patterned steel plate; the thickness of the patterned steel plate is 10-12mm.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) The structure of this utility model is optimized and novel. It sets up a concrete support grid with a large opening, utilizes the corner effect of the foundation pit, and forms stable triangular units from the corner of the foundation pit to extend to the middle of the foundation pit edge line, controls the deformation of the deep foundation pit, ensures the safety of the deep foundation pit construction, and leaves a large area of ​​earthwork excavation construction surface in the middle of the deep foundation pit. A steel trestle bridge is set along the edge of the foundation pit, and an earth slope is set to form a transportation channel for earthwork excavation, which can smoothly allow two-way passage of earth transport vehicles, significantly improve the earthwork excavation speed and shorten the construction period.

[0011] (2) The earth slope left by this utility model is not only a transportation channel, but also significantly enhances the rigidity of the retaining structure on one side of the steel trestle bridge and reduces the deformation of the foundation pit.

[0012] (3) This utility model allows the use of a grab bucket excavator to dig soil on the steel trestle and load it into a dump truck, enabling simultaneous soil transportation from the bottom of the pit and the steel trestle, which greatly improves the excavation speed of earthwork projects and further shortens the construction period. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the plan layout of the deep foundation pit retaining support structure system of this utility model.

[0014] Figure 2 This is a cross-sectional schematic diagram of the deep foundation pit retaining support structure system of this utility model.

[0015] Figure 3 This is a schematic diagram of the plan layout of the concrete support grid structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the plan layout of the steel lattice column of this utility model.

[0017] Figure 5 This is a schematic diagram of the arrangement of concrete cast-in-place piles and cement-soil mixing piles according to this utility model.

[0018] Figure 6This is a detailed schematic diagram of the steel lattice column of this utility model (stairway area).

[0019] Figure 7 This is a schematic diagram of the steel lattice column of this utility model (excluding the trestle bridge area).

[0020] Figure 8 This is a schematic diagram of the steel trestle bridge of this utility model.

[0021] In the diagram: 1-Concrete support grid, 101-Main support beam, 102-Secondary support beam, 2-Steel lattice column, 201-Steel section, 202-Steel gusset plate, 203-Steel support plate, 3-Soil slope, 4-Steel trestle, 401-Trestle main beam, 402-Trestle secondary beam, 403-Patterned steel plate, 5-Concrete cap beam, 6-Concrete cast-in-place pile, 7-Cement-soil mixing pile, 8-Column pile, 9-Pit bottom, 10-Soil transport vehicle, 11-Backhoe excavator, 12-Grab bucket excavator. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1-8 The present utility model patent will be further explained and illustrated by the embodiments.

[0023] Example 1 A deep foundation pit retaining support structure includes a concrete support grid 1, steel lattice columns 2, an earth slope 3, a steel trestle bridge 4, a concrete capping beam 5, concrete cast-in-place piles 6, cement-soil mixing piles 7, column piles 8, and the pit bottom 9. Concrete piles 6 are arranged around the perimeter of the deep foundation pit, and their tops are integrally cast with the concrete capping beam 5. Cement-soil mixing piles 7 are arranged outside the concrete piles 6 and connected to the concrete piles 6 by cement-soil mixture to form a sealed water-stop curtain. The concrete support grid 1 is integrally cast with the concrete capping beam 5. The steel trestle bridge 4 is arranged on the upper part of the concrete support grid 1 along the side of the deep foundation pit entrance and is fixed with anchor bolts. The earth slope 3 is arranged at the opening of the concrete support grid 1, with its upper end connected to the steel trestle bridge 4 and its lower end connected to the pit bottom 9, forming a smooth transportation route. The upper part of the steel lattice column 2 is integrally connected with the concrete support grid 1, and its lower part is integrally cast with the column pile 8. The column pile 8 is cast in the soil at the bottom 9 of the deep foundation pit. A backhoe excavator 11 is also installed at the bottom 9 of the pit. A grab excavator 12 can be used on the steel trestle bridge 4 to dig soil and load it into a dump truck 10, so that the soil transportation at the bottom 9 of the pit and the soil transportation on the steel trestle bridge 4 can be carried out simultaneously.

[0024] Example 2 The rest is consistent with the scheme of Example 1. The concrete support grid 1 can be set as one, two, three or more grids along the vertical direction of the deep foundation pit. The concrete support grid 1 is a system of several triangular grid units constructed by the main support beam 101 and the secondary support beam 102.

[0025] Example 3 The rest is consistent with the scheme of Embodiment 1 or 2. The steel lattice column 2 is welded from the steel section 201 and the steel gusset plate 202. The steel trestle bridge 4 is also equipped with a steel support plate 203. The steel lattice column 2 is arranged along the intersection of the supporting main beam 101 and the supporting secondary beam 102. The steel lattice column 2 can be densely arranged directly under the steel trestle bridge 4 for transporting soil. The dense arrangement of the steel lattice column 2 under the steel trestle bridge 4 for transporting soil further improves the bearing capacity performance of the retaining support structure system, making the stress of the deep foundation pit retaining support structure system very reasonable, thereby ensuring construction safety.

[0026] Example 4 The rest is consistent with any of the schemes in Examples 1-3. The slope of the earth slope 3 is controlled at 1:10-1:11, and the slope width ranges from 6 to 6.5m, allowing the earth transport vehicle 10 to travel in both directions.

[0027] Example 5 The rest is consistent with any of the schemes in Examples 1-4. The steel trestle 4 is made up of the main beam 401, the secondary beam 402 and the patterned steel plate 403, which are fixed together by welding or bolting. The thickness of the patterned steel plate 403 is 10-12mm.

[0028] The above content is an example and description of this utility model patent, but it does not mean that the advantages that this utility model patent can obtain are limited thereto. Any simple changes to the structure and / or one or more advantages that may be achieved in some implementation methods during the practice of this utility model patent are within the scope of protection of this application.

Claims

1. A deep foundation pit retaining support structure, characterized in that, The foundation includes a concrete support grid (1), steel lattice columns (2), a soil slope (3), a steel trestle bridge (4), a concrete capping beam (5), concrete cast-in-place piles (6), cement-soil mixing piles (7), column piles (8), and a pit bottom (9). The concrete cast-in-place piles (6) are arranged around the perimeter of the deep foundation pit, and their tops are cast integrally with the concrete capping beam (5). The cement-soil mixing piles (7) are arranged on the outside of the concrete cast-in-place piles (6). The concrete support grid (1) and the concrete capping beam (5) are cast integrally. The steel trestle (4) is arranged on the upper part of the concrete support grid (1) along the side of the entrance and exit of the deep foundation pit; the earth slope (3) is arranged at the opening of the concrete support grid (1), the upper end of the earth slope (3) is connected to the steel trestle (4), and its lower end is connected to the bottom of the pit (9); the upper part of the steel lattice column (2) is connected to the concrete support grid (1) as a whole, and its lower part is cast as a whole with the column pile (8); the column pile (8) is cast in the soil at the bottom (9) of the deep foundation pit.

2. The deep foundation pit retaining support structure according to claim 1, characterized in that: The concrete support grid (1) is set up in multiple rows along the vertical direction of the deep foundation pit; the concrete support grid (1) is a system of several triangular grid units constructed by the main support beam (101) and the secondary support beam (102).

3. The deep foundation pit retaining support structure according to claim 2, characterized in that: The steel lattice column (2) is welded from steel section (201) and steel gusset plate (202), and the steel trestle (4) is also provided with steel support plate (203); the steel lattice column (2) is arranged along the intersection of the main supporting beam (101) and the secondary supporting beam (102).

4. The deep foundation pit retaining support structure according to claim 1, characterized in that: The slope of the earthen slope (3) is controlled at 1:10-1:11, and the slope width ranges from 6 to 6.5m.

5. The deep foundation pit retaining support structure according to claim 1, characterized in that: The steel trestle (4) is formed by welding or bolting together the main beam (401), the secondary beam (402) and the patterned steel plate (403); the thickness of the patterned steel plate (403) is 10-12mm.

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