A foundation pit support structure

Abstract

The present application relates to the technical field of building foundation pit, especially refers to a kind of foundation pit supporting structure, including waist beam assembly, fish belly beam assembly, counter support assembly, angle support assembly and column assembly connected by various connecting pieces assembly connection;The waist beam assembly includes a plurality of prefabricated steel waist beam units for splicing into a waist beam whole, the connecting place of adjacent two steel waist beam units is provided with a bracket assembly, the lower part of the bracket assembly is connected with the column assembly, an auxiliary support column is arranged in the middle section of each steel waist beam unit, and the bracket assembly is tightly connected with the foundation pit crown beam.The present application uses prestress to resist the deformation of foundation pit enclosure, greatly reduces the number of support rods, expands the construction space, and is convenient to disassemble and recycle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building foundation pit, in particular to a foundation pit supporting structure. BACKGROUND

[0002] In the traditional foundation pit engineering, the common foundation pit retaining structure usually adopts longitudinal and transverse interlaced concrete or steel structure inner support, which has small space for earth excavation construction, and is time-consuming and laborious to install and disassemble. Moreover, in the large-span joint pit supporting, how to ensure the stability of the supporting structure is also a problem to be solved. Therefore, it is necessary to provide a supporting structure which is suitable for large-span foundation pit, simple in structure, convenient for construction and good in stability to solve the above problems. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a foundation pit supporting structure which uses prestress to resist the deformation of the foundation pit retaining, greatly reduces the number of supporting rods, expands the construction space, and is convenient to disassemble and recycle.

[0004] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0005] A foundation pit supporting structure, comprising a waist beam assembly arranged on the inner wall of a foundation pit, a fish belly beam assembly fixedly installed on the inner side of the waist beam assembly, a plurality of buttress assemblies arranged between the symmetrical edges of the waist beam assembly, an angle brace assembly arranged at the corner of the waist beam assembly, and a column assembly arranged below the waist beam assembly and the buttress assembly for vertical support; the waist beam assembly comprises a plurality of prefabricated steel waist beam units connected to form a ring-shaped waist beam whole, a bracket assembly arranged at the connection between two adjacent steel waist beam units, the bracket assembly being connected and installed below the column assembly, an auxiliary support column arranged at the middle segment of each steel waist beam unit, and the bracket assembly being tightly connected with a crown beam of the foundation pit.

[0006] Further, the cross section of each steel waist beam unit is a right trapezoidal surface, an oblique insertion channel is arranged on the end of the steel waist beam unit and parallel to one side of the non-right angle side of the steel waist beam unit; the bracket assembly comprises an L-shaped right-angle bracket plate, a locking bolt and a triangular angle brace, the L-shaped right-angle bracket plate comprises an integrally formed horizontal bracket plate and a vertical baffle plate, two insertion pieces are arranged at the end of the horizontal bracket plate, an inclined first bolt hole is arranged on the vertical baffle plate, and an inclined second bolt hole is arranged on each of the two insertion pieces, the first bolt hole, the oblique insertion channel and the second bolt hole are located on the same straight line during assembly, and the locking bolt penetrates the first bolt hole, the oblique insertion channel and the second bolt hole in sequence; during assembly, the locking bolt and the cross section of the horizontal bracket plate and the vertical baffle plate form a triangle.

[0007] Further, the top of the vertical baffle is provided with a connecting plate, a plurality of connecting through grooves are formed in the connecting plate, and during assembly, steel strands are used to pass through the connecting through grooves and are fixedly connected with the foundation pit crown beam.

[0008] Further, a plurality of threaded holes are formed in the vertical baffle corresponding to the two spliced steel waist beam units, and the vertical baffle and the two spliced steel waist beam units are fixedly connected through bolts.

[0009] Further, a clamping groove is formed in the upper surface of the end of the steel waist beam unit, and a "door" shaped lock is arranged corresponding to the clamping grooves of the two adjacent steel waist beam units.

[0010] Further, the fish belly beam assembly comprises a plurality of straight web members, a plurality of inclined web members and steel strands fixedly connected with the steel waist beam unit, one end of the inclined web member is fixedly installed on the inner side of the steel waist beam unit, the other end of the straight web member is provided with a bridge, one end of the inclined web member is fixedly installed on the inner side of the steel waist beam unit, the other end of the inclined web member is fixedly connected with the straight web member and the steel waist beam unit to form a right triangle, the fish belly beam assembly further comprises a fixed connecting member fixedly installed on the steel waist beam unit, and the steel strands pass through both ends of each bridge and are fixedly connected with the fixed connecting member.

[0011] Further, the bracing assembly comprises an H-shaped steel bracing composed of a plurality of splicable H-shaped steel bracing units, the H-shaped steel bracing is composed of a plurality of spliced H-shaped steel bracing units, both ends of the H-shaped steel bracing are fixedly connected with the inner side of the waist beam assembly, the end of the H-shaped steel bracing is provided with a pressure beam perpendicular to the supporting direction and a force maintaining box, the connecting part of the two adjacent H-shaped steel bracing units is provided with a cover plate for fixed connection, and the H-shaped steel bracing is further provided with a tie rod; the structure of the corner bracing assembly is the same as that of the bracing assembly.

[0012] Further, the column assembly comprises a square steel pipe concrete column, and the square steel pipe concrete column is provided with a support seat for supporting the bracket assembly.

[0013] The beneficial effects of the present application are as follows:

[0014] In actual construction, the entire steel support system utilizes prestress to resist the stress deformation of the foundation pit retaining wall. Pre-tension is applied to the bracing and corner bracing components using jacks, while the fish-belly beam components resist the lateral tension of the foundation pit retaining wall using steel strands. The column components support the weight of the entire steel support system. All components are connected and installed using corresponding connectors. To handle large-span foundation pits, the waist beam components consist of several steel waist beam units connected by bracket components to form a stable and robust waist beam assembly. The bracket components are located at the connection points of two adjacent steel waist beam units, serving both a supporting function and connecting the two units to prevent them from falling off. This invention uses a steel support system, and all components can be standard parts. Unlike traditional concrete supports, this structure has fewer supporting components, a simpler structure, more construction space, and can be disassembled, recycled, and reused. Attached Figure Description

[0015] Figure 1 This is a top view of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the bottom structure of the fish-belly beam of the present invention from below;

[0017] Figure 3 This is a schematic diagram of the waist beam assembly structure of the present invention;

[0018] Figure 4 This is a schematic diagram of the bracket assembly structure of the present invention;

[0019] Figure 5 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0021] like Figures 1-5 As shown, a foundation pit support structure includes a waist beam assembly 1 surrounding the inner wall of the foundation pit. A fish-belly beam assembly 2 is fixedly installed on the inner side of the waist beam assembly 1. Multiple bracing assemblies 3 are provided between the symmetrical sides of the waist beam assembly 1. An angle bracing assembly 4 is provided at the corner of the waist beam assembly 1. A column assembly 5 for vertical support is provided below the waist beam assembly 1 and the bracing assemblies 3. The waist beam assembly 1 includes multiple prefabricated steel waist beam units 11 for splicing into a ring-shaped waist beam. A bracket assembly 12 is provided at the connection between two adjacent steel waist beam units 11. The lower part of the bracket assembly 12 is connected and installed on the column assembly 5. An auxiliary support column is provided in the middle section of each steel waist beam unit 11. The bracket assembly 12 is fastened to the foundation pit cap beam.

[0022] In the actual construction process, the entire steel support system in this embodiment uses prestress to resist the stress deformation of the foundation pit enclosure. The support assembly 3 and the corner support assembly 4 are prestressed by a jack or the like. The fish-belly beam assembly 2 is prestressed by steel strands to resist the lateral tension of the foundation pit enclosure. The column assembly 5 is used to support the self-weight of the entire steel support system. The above assemblies are connected and installed by corresponding connecting pieces. The waist beam assembly 1 is used to cope with large-span foundation pits. A plurality of steel waist beam units 11 are connected by bracket assemblies 12 to form a stable and firm waist beam whole. The bracket assembly 12 is arranged at the connection between the two adjacent spliced steel waist beam units 11. It plays a supporting role while connecting the two steel waist beam units 11 to prevent them from falling off. When multiple layers of construction are needed, only the above assembly process needs to be repeated. The support structure adopts a steel support system. All the fittings can be standard fittings. Unlike traditional concrete support, the structure has fewer support pieces, a simple structure, a large construction space, and can be disassembled and recycled for secondary use.

[0023] As Figure 3 , 4As shown, the cross section of each steel waist beam unit 11 is a right trapezoidal surface, and a slanting insertion channel 111 is formed on the end of the steel waist beam unit 11 parallel to one side of the non-right angle side thereof; the bracket assembly 12 comprises an L-shaped right-angle bracket, a locking bolt 121 and a triangular angle brace, the L-shaped right-angle bracket comprises an integral horizontal bracket 122 and an upright baffle 123, the end of the horizontal bracket 122 is provided with two insertion pieces 124, the upright baffle 123 is provided with an inclined first bolt hole 129, and the two insertion pieces 124 are respectively provided with inclined second bolt holes 125, the first bolt hole 129, the slanting insertion channel 111 and the second bolt holes 125 are located on the same straight line during assembly, and the locking bolt 121 penetrates the first bolt hole 129, the slanting insertion channel 111 and the second bolt holes 125 in sequence; during assembly, the locking bolt 121 and the cross section of the horizontal bracket 122 and the upright baffle 123 form a triangular shape; in this embodiment, the cross section of each steel waist beam unit 11 is a right trapezoidal surface, but in order to reduce the weight of the system itself, a groove is formed on one side of the steel waist beam unit 11 as shown, this structure is suitable for non-stone wall type foundation pits, the installation points are measured, and the L-shaped right-angle bracket is installed on the inner wall of the foundation pit by punching or directly inserting a nail and the like, the two insertion pieces 124 at the end of the horizontal bracket 122 are immersed in the inner wall of the foundation pit, the end of the insertion piece 124 is designed as a sharp tip, the horizontal bracket 122 is supported by a vertical column below, the triangular angle brace is locked, then the steel waist beam units 11 are spliced, the slanting insertion channel 111 of one steel waist beam unit 11 is aligned with a group of first bolt holes 129 and second bolt holes 125, then the locking bolt 121 is inserted into the first bolt hole 129, the slanting insertion channel 111 and the second bolt holes 125 in sequence, the locking bolt and the cross section of the horizontal bracket 122 and the upright baffle 123 form a triangular stable locking structure, which prevents the steel waist beam unit 11 and the L-shaped right-angle bracket from being separated, and also prevents the entire installation structure from being separated from the foundation pit wall.

[0024] As shown in the drawings, Figure 4 As shown, the top of the upright baffle 123 is provided with a connecting plate 126, a plurality of connecting through grooves 127 are formed in the connecting plate 126, and a steel wire is used to pass through the connecting through grooves 127 and be fixedly connected with the foundation pit crown beam during assembly; in this embodiment, the steel wire is additionally arranged between the bracket assembly 12 and the traditional crown beam structure, which can prevent the support from being loosened and plays an auxiliary fastening role.

[0025] As shown in the drawings, Figure 4As shown, the upright baffle 123 is provided with threaded holes 128 corresponding to two spliced steel waist beam units 11 respectively, and the upright baffle 123 is connected with the two spliced steel waist beam units 11 by bolt fastening; in the embodiment, the upright baffle 123 is still connected with the two spliced steel waist beam units 11 by conventional bolt fastening, which is more conducive to the first bolt hole 129, the inclined insertion channel 111 and the second bolt hole 125 being located on the same straight line, and facilitates the insertion of the locking bolt 121.

[0026] As shown in Figure 3 As shown, the upper surface of the end of the steel waist beam unit 11 is provided with a clamping groove 112, and the clamping groove 112 corresponding to the adjacent two steel waist beam units 11 is provided with a "door" shaped lock 113; in the embodiment, the adjacent two steel waist beam units 11 are clamped and locked by the "door" shaped lock 113.

[0027] As shown in Figure 2 As shown, the fish belly beam assembly 2 includes a plurality of straight web members 21, a plurality of inclined web members 22 and steel wire 23 fixedly connected and installed with the steel waist beam unit 11, one end of the inclined web member 22 is fixedly installed on the inner side of the steel waist beam unit 11, the other end of the straight web member 21 is provided with a bridge 24, one end of the inclined web member 22 is fixedly installed on the inner side of the steel waist beam unit 11, the other end of the inclined web member 22 is fixedly connected and installed on the straight web member 21 and forms a right triangle with the straight web member 21 and the steel waist beam unit 11, the fish belly beam assembly 2 further includes a fixed connecting piece 25 fixedly installed on the steel waist beam unit 11, and the steel wire 23 passes through both ends of each bridge 24 and is fixedly bound with the fixed connecting piece 25; in the embodiment, the straight web member 21 and the inclined web member 22 constitute a truss structure for transferring the force between the steel wire 23 and the waist beam assembly 1.

[0028] As shown in Figure 1As shown, the bracing assembly 3 comprises H-shaped steel bracing 41 composed of multiple assemblable H-shaped steel bracing units, the H-shaped steel bracing 41 is spliced by multiple H-shaped steel bracing units, two ends of the H-shaped steel bracing 41 are fixedly connected and installed with the inner side of the waist beam assembly 1, the end of the H-shaped steel bracing 41 is provided with a pressurizing cross beam 42 and a force maintaining box 43 perpendicular to the supporting direction, the connecting position of two adjacent H-shaped steel bracing units is provided with a cover plate 44 for fixed connection, the H-shaped steel bracing 41 is further provided with a tie rod 45; the structure of the corner bracing assembly 4 is the same as that of the bracing assembly 3; in the embodiment, the bracing assembly 3 and the corner bracing assembly 4 are used for axial support prestress, the pressurizing cross beam 42 is perpendicular to the supporting direction, the cross beams are pressurized by the jacks, the force maintaining box 43 is inserted into the pressurizing cross beam 42 after the jacks are pressurized, the axial prestress is maintained, the cover plate 44 strengthens the weak position of the bracing at the splicing joint to form a stable whole, the tie rod 45 is arranged between the adjacent cover plates 44 to provide lateral constraint and improve the overall stability.

[0029] As shown in the figure, Figure 2 As shown, the column assembly 5 comprises a square steel pipe concrete column 51, the square steel pipe concrete column 51 is provided with a support seat 52 for supporting the bracket assembly 12; in the embodiment, the support seat 52 combines the bracket assembly 12 to transmit the weight of the bracing assembly 3 and the corner bracing assembly 4 to the square steel pipe concrete column 51.

[0030] All the technical features in the embodiment can be modified in appearance according to actual needs.

[0031] The above embodiment is a preferred implementation scheme of the present application, in addition to this, the present application can be realized in other ways, without departing from the technical scheme concept, any obvious replacement is within the protection scope of the present application.

Claims

1. A foundation pit support structure, characterized in that: The structure includes a waist beam assembly (1) enclosing the inner wall of the foundation pit. A fish belly beam assembly (2) is fixedly installed on the inner side of the waist beam assembly (1). Multiple supporting assemblies (3) are provided between the symmetrical sides of the waist beam assembly (1). An angle bracing assembly (4) is provided at the corner of the waist beam assembly (1). A column assembly (5) for vertical support is provided below the waist beam assembly (1) and the supporting assemblies (3). The waist beam assembly (1) includes multiple prefabricated steel waist beam units (11) for splicing into a ring waist beam as a whole. A bracket assembly (12) is provided at the connection between two adjacent steel waist beam units (11). The bracket assembly (12) is connected and installed on the column assembly (5) below. An auxiliary support column is provided in the middle section of each steel waist beam unit (11). The bracket assembly (12) is fastened to the foundation pit cap beam. Each of the steel waist beam units (11) has a cross-section that is a right-angled trapezoidal surface, and an oblique insertion channel (111) is provided on one side of the steel waist beam unit (11) that is parallel to its non-right-angled side. The bracket assembly (12) includes an L-shaped right-angle bracket, a locking pin (121), and a triangular corner brace. The L-shaped right-angle bracket includes an integrally formed horizontal bracket (122) and a vertical baffle (123). The end of the horizontal bracket (122) is provided with two inserts (124). The vertical baffle (123) is provided with an inclined first pin hole (129). The two inserts (124) are respectively provided with inclined second pin holes (125). During assembly, the first pin hole (129), the inclined insertion channel (111), and the second pin hole (125) are located on the same straight line. The locking pin (121) passes through the first pin hole (129), the inclined insertion channel (111), and the second pin hole (125) in sequence. During assembly, the locking pin (121) forms a triangle with the cross-section of the horizontal bracket (122) and the vertical baffle (123). The fish-belly beam assembly (2) includes multiple straight web members (21), multiple diagonal web members (22), and steel strands (23) that are fixedly connected to the steel waist beam unit (11). One end of the diagonal web member (22) is vertically fixedly installed on the inner side of the steel waist beam unit (11), and the other end of the straight web member (21) is provided with a bridge (24). One end of the diagonal web member (22) is fixedly installed on the inner side of the steel waist beam unit (11), and the other end of the diagonal web member (22) is fixedly connected to the straight web member (21) and forms a right triangle with the straight web member (21) and the steel waist beam unit (11). The fish-belly beam assembly (2) also includes a fixed connector (25) fixedly installed on the steel waist beam unit (11). The steel strands (23) pass through each bridge (24) and are fixedly bound to the fixed connector (25) at both ends. The bracing assembly (3) includes an H-beam bracing (41) composed of multiple assembleable H-beam bracing units. The H-beam bracing (41) is spliced ​​together from multiple H-beam bracing units. The two ends of the H-beam bracing (41) are fixedly connected to the inner side of the waist beam assembly (1). The end of the H-beam bracing (41) is provided with a pressure beam (42) perpendicular to the support direction and a force-holding box (43). The connection between two adjacent H-beam bracing units is provided with a cover plate (44) for connection and fixation. The H-beam bracing (41) is also provided with a tie rod (45). The structure of the gusset assembly (4) is the same as that of the counter-bracing assembly (3).

2. The foundation pit support structure according to claim 1, characterized in that: The top of the upright baffle (123) is provided with a connecting plate (126), and the connecting plate (126) is provided with several connecting slots (127). During assembly, steel strands are passed through the connecting slots (127) and fixedly bound to the foundation pit cap beam.

3. The foundation pit support structure according to claim 1, characterized in that: The upright baffle (123) is provided with multiple threaded holes (128) corresponding to the two spliced ​​steel waist beam units (11), and the upright baffle (123) and the two spliced ​​steel waist beam units (11) are fastened together by bolts.

4. The foundation pit support structure according to claim 1, characterized in that: The upper surface of the end of the steel waist beam unit (11) is provided with a slot (112), and the slots (112) of the two adjacent steel waist beam units (11) are provided with a "door" shaped latch (113).

5. The foundation pit support structure according to claim 1, characterized in that: The column assembly (5) includes a square steel tube concrete column (51), and the square steel tube concrete column (51) is provided with a support (52) for supporting the bracket assembly (12).

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