Novel cross brace structure at top of foundation pit

Abstract

The utility model discloses a novel cross brace structure at the top of a foundation pit in the technical field of foundation pit construction, which comprises two foundation pit pile foundations and top beams, the top beams are arranged at the tops of the two foundation pit pile foundations, and a supporting steel pipe is arranged between the two top beams; the supporting steel pipe comprises a steel pipe body and two first side steel plates, the two first side steel plates are welded to the left side and the right side of the steel pipe body correspondingly, the supporting steel pipe body and the rigid supporting frame are arranged, and the transverse support higher than the top of the foundation pit top beam is arranged, so that it is possible that operation in a foundation pit and traffic entering the pit are not affected, and installation and recycling are easy; a vertical supporting formwork of a temporary transverse support does not need to be arranged during installation, and the structure has a good supporting effect on a foundation pit with the high requirement for the clear height.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit construction, in particular to a novel cross bracing structure on the top of a foundation pit. Background Art

[0002] When excavating the foundation pit, due to the limitations of the excavation site, it is necessary to adopt a vertical excavation method for the foundation pit to reduce the impact on surrounding buildings. The vertical side walls generally use vertical pile foundations and pile top crown beams. Rigid cross braces are needed at the crown beam position to support the crown beams on the left and right sides of the foundation pit. For the cross braces on the top of the foundation pit of hydraulic structures, such as the water inlet buried in the bottom of the reservoir, it is also necessary to consider not affecting the entry of large transport vehicles into the cave and meeting the height requirements of the concrete or steel structure construction at the foundation pit location.

[0003] At present, the cross braces of foundation pits in China are generally set on the side walls of the crown beam at the top of the foundation pit, while the cross brace system in this structure is higher than the crown beam, which can reduce the impact on the construction work of the structure in the foundation pit. To this end, we propose a new cross brace structure at the top of the foundation pit to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] Therefore, the purpose of the utility model is to provide a new type of cross bracing structure on the top of the foundation pit, which can solve the problem that the cross braces of the foundation pit in China are generally set on the side walls of the crown beam at the top of the foundation pit, while the cross bracing system in this structure is higher than the crown beam, which can reduce the impact on the construction work of the structure in the foundation pit.

[0006] In order to solve the above technical problems, the utility model provides a new type of cross bracing structure on the top of the foundation pit, which adopts the following technical solution: comprising a foundation pit pile foundation and a crown beam, wherein there are two foundation pit pile foundations, and the tops of the two foundation pit pile foundations are both provided with crown beams, and a supporting steel pipe is provided between the two crown beams;

[0007] The supporting steel pipe comprises a steel pipe and two first side steel plates, and the two first side steel plates are respectively welded to the left and right sides of the steel pipe.

[0008] Optionally, a rigid support frame is provided on the top of the two crown beams;

[0009] The rigid support frame includes a second side steel plate, three first polygonal plates and a bottom plate. The three first polygonal plates are horizontally and equidistantly distributed on one side of the surface of the second side steel plate, and the three first polygonal plates are welded to the surface of the second side steel plate. The second side steel plate and the bottoms of the three first polygonal plates are welded to the top of the bottom plate.

[0010] By adopting the above technical scheme, this scheme provides a rigid support frame above the crown beam, and the rigid support frame is assembled by the second side steel plate, three first polygonal plates and the bottom plate, and two groups of rigid support frames are distributed on the left and right sides of the supporting steel pipe to form a door-type support, thereby improving the supporting capacity of the supporting steel pipe.

[0011] Optionally, the bottoms of the two base plates are fixedly connected to the top plate by bolts, and a vertical steel plate is provided at the ends of the two top plates that are close to each other. The two vertical steel plates are perpendicular to and welded to the bottoms of the top plates at corresponding positions, and three second polygonal plates are equidistantly provided between the vertical steel plates and the top plates, and the three second polygonal plates are welded to the vertical steel plates and the top plate.

[0012] By adopting the above technical solution, this solution provides a top plate at the bottom of the bottom plate, and three second polygonal plates and vertical steel plates are welded to the bottom of the top plate, so that the bottom plate of the rigid support frame sits on the top of the crown beam, and the vertical steel plate contacts the outer side of the crown beam as much as possible.

[0013] Optionally, the top plate and the bottom plate at an adjacent position are fixedly connected by bolts.

[0014] By adopting the above technical solution, the present solution connects the bottoms of the two rigid support frames with the two top plates by fixing the top plate and the bottom plate with bolts.

[0015] Optionally, the first side steel plate and the second side steel plate are fixedly connected by bolts, and the first side steel plate and the second side steel plate are fitted together by inserting a thin steel plate.

[0016] By adopting the above technical solution, this solution assembles the first side steel plate and the second side steel plate with each other by using bolts, while ensuring that the vertical steel plate is in close contact with the outer side of the crown beam. If there is still a gap between the first side steel plate and the second side steel plate, a thin steel plate is inserted to ensure that the cross bracing structure is closely connected to the crown beam.

[0017] Optionally, the bottom of the base plate is located at the top of the crown beam at a corresponding position, the base plate is fixedly connected to the crown beam by bolts, and the crown beam is filled with a chemical coagulant.

[0018] By adopting the above technical solution, this solution completes the foundation pit cross bracing system by drilling holes at the corresponding positions of the contact area between the foundation pit crown beam and the bottom plate, anchoring bolts after drilling and fixing them with chemical adhesives, and after the chemical adhesive hardens, locking bolts to fix the bottom plate and the crown beam.

[0019] In summary, the utility model includes at least one of the following beneficial effects: 1. By setting supporting steel pipes and rigid support frames, and through lateral supports that are higher than the top of the foundation pit crown beam, it is possible not to affect operations in the foundation pit and traffic into the cave, and it is easy to install and recycle, and there is no need to set up temporary vertical support templates with temporary horizontal braces during installation. This structure has a good supporting effect on foundation pits with high requirements for clear height.

[0020] 2. Tighten the bolts between the first side steel plate and the second side steel plate to ensure that the vertical steel plate is in close contact with the outer side of the crown beam. If there is still a gap between the first side steel plate and the second side steel plate, insert a thin steel plate to make the cross bracing structure closely connected to the crown beam. Connect it to the bottom crown beam through the bottom plate. The bolts need to pass through the crown beam and anchor to a certain depth. Use chemicals to fix the buried crown beam part firmly. Then fix the nut to the upper part of the bottom plate. Lock the nut after the chemical in the crown beam solidifies, thereby improving the connection sealing between the rigid support frame and the crown beam, thereby improving the stability of the overall cross bracing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are 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 creative work.

[0022] Figure 1 It is a cross-sectional view of the overall structure of the utility model;

[0023] Figure 2 It is the overall structural plan of the utility model;

[0024] Figure 3 This is a schematic diagram of the side structure of the crown beam of the utility model;

[0025] Figure 4 This is a vertical view of the rigid support frame of the utility model;

[0026] Figure 5 This is a top view of the rigid support frame of the utility model;

[0027] Figure 6 It is a schematic diagram of the surface structure of the crown beam of the utility model.

[0028] Explanation of the accompanying reference numerals: 1. foundation pit pile foundation; 2. crown beam; 3. steel pipe; 4. first side steel plate; 5. second side steel plate; 6. first polygonal plate; 7. bottom plate; 8. top plate; 9. vertical steel plate; 10. second polygonal plate; 11. thin steel plate. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-6 The utility model is described in further detail.

[0030] Embodiment 1, refer to Figure 1-6 In this embodiment, in order to solve the problem that the current domestic foundation pit cross braces are generally set on the side walls of the top beam of the foundation pit, while the cross brace system in this structure is higher than the top beam, which can reduce the impact on the construction work of the structure in the foundation pit, the utility model discloses a new cross brace structure on the top of the foundation pit.

[0031] It includes a foundation pit pile foundation 1 and a crown beam 2. There are two foundation pit pile foundations 1, and the tops of the two foundation pit pile foundations 1 are both provided with a crown beam 2, and a supporting steel pipe 3 is provided between the two crown beams 2;

[0032] The supporting steel pipe 3 comprises a steel pipe 3 and two first side steel plates 4 , and the two first side steel plates 4 are welded to the left and right sides of the steel pipe 3 respectively.

[0033] Rigid support frames are provided on the tops of the two crown beams 2;

[0034] The rigid support frame includes a second side steel plate 5, three first polygonal plates 6 and a bottom plate 7. The three first polygonal plates 6 are horizontally and equidistantly distributed on one side of the surface of the second side steel plate 5, and the three first polygonal plates 6 are welded to the surface of the second side steel plate 5. The second side steel plate 5 and the bottoms of the three first polygonal plates 6 are welded to the top of the bottom plate 7.

[0035] The bottoms of the two bottom plates 7 are fixedly connected to the top plates 8 by bolts, and a vertical steel plate 9 is provided at the ends close to the bottoms of the two top plates 8. The two vertical steel plates 9 are perpendicular to and welded to the bottoms of the top plates 8 at corresponding positions, and three second polygonal plates 10 are equidistantly provided between the vertical steel plates 9 and the top plates 8, and the three second polygonal plates 10 are welded to the vertical steel plates 9 and the top plates 8.

[0036] The top plate 8 is fixedly connected to the bottom plate 7 at an adjacent position by means of bolts.

[0037] The specific working principle is: by welding the support steel pipe 3 sections to the first side steel plates 4 on both sides, and then bolting the two rigid support frames to the first side steel plates 4 through the second side steel plates 5, the entire support steel pipe 3 and the two sets of rigid support frames are installed on the crown beam 2 as a cross-bracing structure.

[0038] Example 2, refer to Figure 1-6 In this embodiment, in order to solve the problem that the existing cross bracing structure and the crown beam 2 are still unstable after being fixed by bolts, based on the same concept as the above-mentioned embodiment 1, the new cross bracing structure on the top of the foundation pit also includes:

[0039] The first side steel plate 4 and the second side steel plate 5 are fixedly connected by bolts, and the first side steel plate 4 and the second side steel plate 5 are bonded to each other by inserting a thin steel plate 11 therebetween.

[0040] The bottom of the bottom plate 7 is located at the top of the crown beam 2 at a corresponding position. The bottom plate 7 is fixedly connected to the crown beam 2 by bolts, and the crown beam 2 is filled with a chemical coagulant.

[0041] The specific working principle is: by tightening the bolts between the first side steel plate 4 and the second side steel plate 5, it is ensured that the vertical steel plate 9 is in close contact with the outer side of the crown beam 2. If there is still a gap between the first side steel plate 4 and the second side steel plate 5, a thin steel plate 11 is inserted to make the cross bracing structure closely connected with the crown beam 2, and connected with the bottom crown beam 2 through the bottom plate 7. The bolts need to pass through the crown beam 2 and anchor to a certain depth, and a chemical agent is used to fix the part buried in the crown beam 2 firmly, and then the nut is fixed to the upper part of the bottom plate 7, and the nut is locked after the chemical agent in the crown beam 2 solidifies, thereby improving the connection sealing between the rigid support frame and the crown beam 2, thereby improving the stability of the overall cross bracing structure. Figure 5 The small round holes in the shaded area are where the surface of the crown beam 2 is drilled and filled with chemicals, and the small round holes in the non-shaded area are through-bolts.

[0042] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A novel cross bracing structure at the top of a foundation pit, comprising a foundation pit pile foundation (1) and a crown beam (2), characterized in that: There are two foundation pit pile foundations (1), and a crown beam (2) is provided on the top of each of the two foundation pit pile foundations (1), and a supporting steel pipe is provided between the two crown beams (2); The supporting steel pipe comprises a steel pipe (3) and two first side steel plates (4), wherein the two first side steel plates (4) are respectively welded to the left and right sides of the steel pipe (3); A rigid support frame is provided at the top of each of the two crown beams (2); the rigid support frame comprises a second side steel plate (5), three first polygonal plates (6) and a bottom plate (7); the three first polygonal plates (6) are horizontally and equidistantly distributed on one side of the surface of the second side steel plate (5); the three first polygonal plates (6) are welded to the surface of the second side steel plate (5); the bottoms of the second side steel plate (5) and the three first polygonal plates (6) are welded to the top of the bottom plate (7); The first side steel plate (4) and the second side steel plate (5) are fixedly connected by bolts, and the first side steel plate (4) and the second side steel plate (5) are fitted together by inserting a thin steel plate (11) therebetween.

2. A novel horizontal bracing structure at the top of a foundation pit according to claim 1, characterized in that: The bottoms of the two bottom plates (7) are fixedly connected to the top plate (8) by bolts, and the ends of the bottoms of the two top plates (8) that are close to each other are each provided with a vertical steel plate (9). The two vertical steel plates (9) are mutually perpendicular to and welded to the bottoms of the top plates (8) at corresponding positions, and three second polygonal plates (10) are equidistantly provided between the vertical steel plates (9) and the top plate (8), and the three second polygonal plates (10) are mutually welded to the vertical steel plates (9) and the top plate (8).

3. A novel horizontal bracing structure at the top of a foundation pit according to claim 2, characterized in that: The top plate (8) and the bottom plate (7) at an adjacent position are fixedly connected by bolts.

4. A novel horizontal bracing structure at the top of a foundation pit according to claim 3, characterized in that: The bottom of the bottom plate (7) is located at the top of the crown beam (2) at a corresponding position, the bottom plate (7) is fixedly connected to the crown beam (2) by bolts, and the crown beam (2) is filled with a chemical coagulant.

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