Supporting system in foundation pit

Abstract

The utility model relates to the field of buildings, in particular to a support system in a foundation pit, which is characterized in that crown beams are arranged around the inner ring of the foundation pit, upright posts are arranged in the foundation pit along the vertical direction, two groups of crown beams which are oppositely arranged are fixedly connected through a support frame, and a joist is horizontally fixed on the upright posts and is fixedly connected with the support frame through a fastener. Therefore, the support frame is supported from bottom to top. According to the utility model, the supporting structure in the foundation pit can be quickly mounted, and the supporting structure can be recycled, so that the construction cost of a project is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of construction, in particular to a support system in a foundation pit. Background Art

[0002] The foundation pit is a soil pit excavated at the foundation design location according to the base elevation and foundation plane dimensions. After the excavation is completed, its inner wall needs to be supported to prevent the foundation pit from collapsing. Existing foundation pit support methods include: internal support, pile support, retaining wall support, soil nail wall support and underground continuous wall support, etc., and multiple support methods can also be used in combination.

[0003] At present, the most commonly used internal support method is reinforced concrete internal support as described in the publication number "CN117926825A". After excavation, a support structure is first set up on the soil surface of the corresponding foundation pit, and then concrete protection is sprayed on the support structure. Rock nails are constructed in the soil layer on the concrete protection. After the rock nail construction is completed, mesh sprayed concrete is constructed on the surface of the concrete protection. The construction process requires formwork, maintenance, and demolding processes, and there are problems such as long construction period and large cross-sectional size. At the same time, after the project is completed, the reinforced concrete needs to remove the reinforced concrete internal support, which forms construction waste and causes waste of resources, so it is urgent to solve it. Summary of the invention

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a support system in a foundation pit. The utility model can realize the rapid installation of the support structure in the foundation pit, and the support structure can be recycled, which greatly reduces the construction cost of the project.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A support system in a foundation pit, wherein crown beams are arranged around the inner circle of the foundation pit, columns are arranged in the foundation pit along the vertical direction, two sets of crown beams arranged opposite to each other are connected and fixed by support frames, support beams are horizontally fixed on the columns, and the support beams are connected and fixed to the support frames by fasteners, thereby supporting the support frames from bottom to top.

[0007] As a further solution of the utility model: the fasteners include two groups of upper angle steels arranged in parallel and two groups of lower angle steels arranged in parallel, the upper angle steels and the lower angle steels are perpendicular to each other, the plate surface of the upper angle steels abuts against the top surface of the support frame, and the plate surface of the lower angle steels abuts against the bottom surface of the supporting beam, any upper angle steel is connected and fixed to the two lower angle steels in sequence through two groups of through bolts, and any lower angle steel is connected and fixed to the two upper angle steels in sequence through two groups of through bolts, the upper angle steels, the lower angle steels and the through bolts cooperate with each other to form a cubic frame structure, thereby clamping and fixing the supporting frame and the supporting beam.

[0008] As a further solution of the utility model: the columns, support frames and support beams are all PEC components.

[0009] As a further solution of the utility model: the support frame includes at least two groups of longitudinal beams arranged in parallel and at least two groups of cross beams arranged perpendicular to the longitudinal beams, each cross beam is used to connect two adjacent groups of longitudinal beams, the two ends of each longitudinal beam are respectively connected and fixed to the two groups of crown beams, the supporting beams are arranged below the longitudinal beams and arranged perpendicular to the longitudinal beams, each longitudinal beam is connected and fixed to the supporting beams by fasteners, and the columns are located at the center of the two adjacent groups of longitudinal beams.

[0010] As a further solution of the utility model: a surrounding purlin beam support is installed on the crown beam, the surrounding purlin is arranged along the length direction of the crown beam, and is welded and fixed to the crown beam by the surrounding purlin beam support, and the surrounding purlin is fixed to each longitudinal beam by bolts.

[0011] As a further solution of the utility model: there is a gap between the surrounding purlin and the crown beam for filling with concrete.

[0012] As a further solution of the utility model: a column beam support for supporting the joist is arranged on the column, and the column beam support is welded and fixed to the joist and the column.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model installs columns vertically in the foundation pit, supports the joist through one or more groups of columns, and under the supporting action of the joist, the support frame connects the two groups of crown beams arranged oppositely, so as to form an internal support for the foundation pit. Since the columns, support frames and joists are all PEC components, they have the advantages of high bearing capacity, good ductility and good earthquake resistance. Compared with reinforced concrete components, the cross-sectional size of the components and the deadweight of the components are greatly reduced. At the same time, the steel section of the PEC components is exposed, and the steel structure connection method can be adopted to achieve recycling, reduce the amount of steel used and the project cost, and the overall structure is easy to disassemble and assemble, and can be recycled.

[0015] 2. The utility model forms fasteners through two groups of upper angle steels, two groups of lower angle steels and four groups of through bolts, and uses a cubic frame structure to limit the relative displacement between the support frame and the joist, thereby clamping the support frame and the joist. During the installation process, the four groups of through bolts are loosened to allow the joist and the longitudinal beam to slide, thereby achieving fine-tuning of the position.

[0016] 3. The support frame of the utility model is composed of longitudinal beams and transverse beams, thus forming a ladder structure, supporting two sets of opposing crown beams, and forming a stable support for the crown beams; the crown beams and the longitudinal beams are connected and fixed by surrounding purlins, and the surrounding purlins and each longitudinal beam are connected by bolts, so as to facilitate disassembly, and a gap is left between the surrounding purlins and the crown beams for filling with concrete to improve the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0019] Figure 3 It is a side view of the utility model.

[0020] In the figure:

[0021] 1. Column; 11. Column beam support;

[0022] 2. Joist; 3. Support frame; 31. Longitudinal beam; 32. Cross beam;

[0023] 4. Fasteners; 41. Upper angle steel; 42. Lower angle steel; 43. Through bolts;

[0024] 5. Crown beam; 6. Surrounding purlin; 61. Surrounding purlin beam support. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figures 1 to 3 In the embodiment of the utility model, a support system in a foundation pit is provided, and a crown beam 5 is arranged around the inner circle of the foundation pit. Taking the foundation pit as a square foundation pit as an example, the crown beam 5 is in a square shape. Two sets of parallel longitudinal beams 31 and a cross beam 32 located between the longitudinal beams 31 and arranged perpendicular to the longitudinal beams 31 constitute a set of support frames 3. At least one set of support frames 3 is arranged in the foundation pit, and the support frames 3 are preferably evenly spaced along the length direction of the foundation pit.

[0027] The number of the cross beams 32 is not limited, and they are evenly spaced between the longitudinal beams 31 . The two longitudinal beams 31 and the cross beams 32 form a ladder-like structure, and the longitudinal beams 31 and the cross beams 32 are connected by stiffening plates and round cap bolts.

[0028] A surrounding purlin 6 is installed in the crown beam 5, and the surrounding purlin 6 is welded and fixed to the crown beam 5 through a surrounding purlin beam support 61. There is a certain gap between the surrounding purlin beam support 61 and the crown beam 5, which is used for pouring C30 concrete.

[0029] The surrounding purlin beam support 61 is connected and fixed to each longitudinal beam 31. Preferably, a partition is installed between the surrounding purlin beam support 61 and the longitudinal beam 31 and fixed by bolt connection.

[0030] In order to improve the support firmness, a group of columns 1 are fixed between the two longitudinal beams 31 of each support frame 3 in the vertical direction, and the column 1 is located at the center of the support frame 3. A column beam support 11 for supporting the joist beam 2 is fixed on the column 1, and the joist beam 2 is welded and fixed to the column 1 through the column beam support 11.

[0031] The joist 2 is arranged in a direction parallel to the cross beam 32, and supports the support frame 3 from bottom to top. The joist 2, the longitudinal beam 31, the cross beam 32 and the column 1 are all PEC components. The PEC components can reduce the cross-sectional size of the components and reduce the deadweight of the components. At the same time, the steel of the PEC components is exposed, and the steel structure connection method can be adopted to achieve recycling. Compared with steel structures, PEC components can reduce the cross-sectional size, reduce the amount of steel used and the project cost.

[0032] The cross-sections of the joist 2, the longitudinal beam 31, the cross beam 32 and the column 1 are all rectangular, and each longitudinal beam 31 is connected and fixed to the joist 2 by a fastener 4. The fastener 4 includes two sets of upper angle steels 41 arranged in parallel and two sets of lower angle steels 42 arranged in parallel, the upper angle steels 41 are arranged perpendicular to the longitudinal beam 31, and the lower angle steels 42 are arranged perpendicular to the cross beam 32. The projections of any set of upper angle steels 41 and the two sets of lower angle steels 42 in the vertical direction intersect, and the projections of any set of lower angle steels 42 and the two sets of upper angle steels 41 in the vertical direction intersect.

[0033] The two sets of upper angle steels 41 and the two lower angle steels 42 are connected and fixed by four sets of through bolts 43, thereby forming a cubic frame structure, clamping and fixing the longitudinal beam 31 and the joist beam 2. The upper angle steel 41 and the lower angle steel 42 are used to limit the vertical shaking between the longitudinal beam 31 and the joist beam 2, and the four sets of through bolts 43 are used to limit the horizontal shaking between the longitudinal beam 31 and the joist beam 2.

[0034] By loosening the four sets of through bolts 43, sliding can be generated between the joist beam 2 and the longitudinal beam 31, thereby achieving fine adjustment of the position.

[0035] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0036] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0037] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A support system in a foundation pit, characterized in that: A crown beam (5) is arranged around the inner circle of the foundation pit, and the columns (1) are arranged in the foundation pit along the vertical direction. Two groups of crown beams (5) arranged opposite to each other are connected and fixed by a support frame (3). A support beam (2) is horizontally fixed on the column (1), and the support beam (2) is connected and fixed to the support frame (3) by a fastener (4), thereby supporting the support frame (3) from bottom to top.

2. A foundation pit support system according to claim 1, characterized in that: The fastener (4) comprises two groups of upper angle steels (41) arranged in parallel and two groups of lower angle steels (42) arranged in parallel. The upper angle steels (41) and the lower angle steels (42) are perpendicular to each other. The plate surface of the upper angle steels (41) abuts against the top surface of the support frame (3), and the plate surface of the lower angle steels (42) abuts against the bottom surface of the support beam (2). Any upper angle steel (41) is connected and fixed to the two lower angle steels (42) in sequence through two groups of through bolts (43), and any lower angle steel (42) is connected and fixed to the two upper angle steels (41) in sequence through two groups of through bolts (43). The upper angle steels (41), the lower angle steels (42) and the through bolts (43) cooperate with each other to form a cubic frame structure, thereby clamping and fixing the support frame (3) and the support beam (2).

3. A foundation pit support system according to claim 2, characterized in that: The columns (1), support frames (3) and support beams (2) are all PEC components.

4. A foundation pit support system according to any one of claims 1 to 3, characterized in that: The support frame (3) comprises at least two groups of longitudinal beams (31) arranged in parallel and at least two groups of transverse beams (32) arranged perpendicular to the longitudinal beams (31); each transverse beam (32) is used to connect two adjacent groups of longitudinal beams (31); two ends of each longitudinal beam (31) are respectively connected and fixed to two groups of crown beams (5); a joist (2) is arranged below the longitudinal beam (31) and perpendicular to the longitudinal beam (31); each longitudinal beam (31) is connected and fixed to the joist (2) via a fastener (4); and a column (1) is located at the center of two adjacent groups of longitudinal beams (31).

5. A foundation pit support system according to claim 4, characterized in that: The crown beam (5) is provided with a surrounding purlin beam support (61), the surrounding purlin (6) is arranged along the length direction of the crown beam (5), and is fixed to the crown beam (5) by welding the surrounding purlin beam support (61), and the surrounding purlin (6) is fixed to each longitudinal beam (31) by bolts.

6. A foundation pit support system according to claim 5, characterized in that: There is a gap between the surrounding purlin (6) and the crown beam (5) for filling with concrete.

7. A foundation pit support system according to any one of claims 1 to 3, characterized in that: The column (1) is provided with a column beam support (11) for supporting the supporting beam (2), and the column beam support (11) is welded and fixed to the supporting beam (2) and the column (1).

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