Flexible hinged supporting structure of composite frame anchoring system

Abstract

The utility model relates to a flexible hinge supporting structure of a composite frame anchoring system, and belongs to the technical field of slope supporting design and construction. Comprising breast boards, cross beams, stand columns, fabricated soil nails, pre-stressed anchor rods, anchor rod supports and free hinges, the flexible hinged supporting structure of the composite frame anchoring system is in a grid shape, the pre-stressed anchor rods serve as nodes of a grid and are arranged in the anchor rod supports in a sleeved mode, the anchor rod supports are connected with the cross beams and the stand columns through the free hinges, and the cross beams and the stand columns are connected through the free hinges. The four edges of the soil retaining plate are connected with the cross beams and the stand columns, and the assembled soil nails penetrate through the center of the soil retaining plate to be inserted into the foundation pit slope. The composite anchoring system has the advantages that the composite anchoring system combines the assembled soil nails and the frame pre-stressed anchor rods, and a flexible hinged supporting structure of the composite frame anchoring system is established. The requirements for environmental protection and carbon neutralization in building development are met, the frame connecting form is optimized, and the anchoring force of a support and the stability of a foundation pit are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of slope support design and construction, specifically to a flexible hinged support structure of composite frame anchoring system. BACKGROUND

[0002] In recent years, on the basis of modern support principle, frame prestressed anchor rod support structure is proposed in the research of slope protection. The structure of this new type of foundation pit support is mostly composed of soil retaining plate and numerous small tonnage prestressed anchor rods. The prestress of anchor rod is transmitted to the soil retaining panel, which actively supports the slope surface. The anchoring force is transmitted to the embedded stratum through the anchoring section, thereby realizing the support form combining active protection and passive protection, effectively controlling the displacement of foundation pit and improving the stability of slope.

[0003] For some soft slope with low shear strength and high water content, the traditional anchoring technology cannot provide sufficient anchoring force under the influence of underground water. Moreover, the frame part of the traditional frame anchoring system is integrally poured and rigidly connected, which is easy to cause damage and failure of the support itself under the load of earthquake and rainfall. CONTENT OF THE UTILITY MODEL

[0004] In view of the above problems in the prior art, the utility model provides a flexible hinged support structure of composite frame anchoring system, which solves the problems of insufficient anchoring force of traditional frame anchoring structure and possible landslide and structural failure caused by damage of frame member itself under the load of earthquake and rainfall.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a flexible hinged support structure of composite frame anchoring system, characterized by comprising a soil retaining plate, a cross beam, a stand, an assembled soil nail, a prestressed anchor rod, an anchor rod support and a free hinge.

[0006] The flexible hinged support structure of composite frame anchoring system is in a grid shape, and the prestressed anchor rod is the node of the grid. The prestressed anchor rod is sleeved in the anchor rod support. The anchor rod support is connected with the cross beam and the stand through the free hinge. The four edges of the soil retaining plate are connected with the cross beam and the stand. The assembled soil nail is inserted into the inside of the foundation pit slope through the center of the soil retaining plate.

[0007] The part of the assembled soil nail exposed outside the soil body is anchored in the soil retaining plate by the end fixing member. The thickened nut is installed on the sleeve wire of the round steel beyond the end fixing member. The soil nail rod body is inserted into the metal pipe at one end in the soil body. The chemical structural adhesive is injected between the metal pipe and the soil nail rod body. The metal pipe is anchored to the pressure plate by the anchor. The sleeve wire of the round steel at one end is screwed into the end cap nut. The pressure plate and the end cap nut are welded and fixed.

[0008] The earth-retaining plate transmits the earth pressure to the cross beams and the columns, and then to the anchoring section of the prestressed anchor rod through the anchor rod support and the free hinge.

[0009] Preferably, the earth-retaining plate is a plate-shaped component made of a prefabricated concrete plate, which is installed in the grid formed by the cross beams and the columns to form an earth-retaining unit.

[0010] Preferably, a layer of PVC pipe is sleeved on the round steel rod body of the soil nail rod.

[0011] Preferably, the end fixing member is composed of an anchoring plate, a square ring and a rib plate, the anchoring plate is a ribbed hexagonal steel plate, the square ring is arranged at the center, and the rib plate is fixed to the side surface of the anchoring plate in a welded manner. Advantages

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The addition of the soil nail support in the frame prestressed anchor rod support structure forms a composite frame anchoring system, which not only makes up for the defects of low bonding strength and poor anti-pulling bearing capacity of the existing anchor rod technology and soft soil, reduces the displacement of the foundation pit soil, but also transmits the earth pressure on the slope surface to the stable soil layer through the frame structure, strengthens the connection between the structure and the stable soil layer, effectively ensures the stability and safety of the whole, and becomes a new type of support structure combining active reinforcement and passive support.

[0014] The traditional soil nail support structure provides the anti-pulling force by the interfacial cohesion or friction between the grouting anchoring body and the soil. When the main underground structure construction is completed, the traditional soil nail wall is buried in the soil by the backfilling soil, the original soil nail rod body not only becomes an obstacle for the development of adjacent underground engineering, but also pollutes the geological environment. Based on the concept of green environmental protection and sustainable development, the assembly type soil nail support technology is selected, which is convenient for assembly and disassembly, can realize factory manufacturing and construction assembly, achieves no pollution in the construction process, green environmental protection, and can greatly shorten the construction period.

[0015] At present, the research on the frame anchoring support structure focuses on the optimization of the support effect, and the design and optimization of the frame member are relatively less. The rigid design of the traditional frame is easy to be damaged and fail under the action of the earthquake. According to the optimization of the force transmission mechanism, the removal of the degree of freedom and the design principle of the energy dissipation of the slope, the rigid connection between the anchor rod support and the frame structure is changed into a hinge connection, and a flexible hinge frame anchoring system is established. The flexible support can allow the overall deformation of the slope and the support system, and then produce energy dissipation of the slope, slow down the damage speed of the slope surface and enhance the stability of the slope. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1The utility model discloses a whole structure schematic diagram;

[0017] Figure 2 The utility model discloses Figure 1 The utility model discloses a cross section schematic diagram of 1-1;

[0018] Figure 3 The utility model discloses Figure 1 The utility model discloses a partial enlarged schematic diagram of A place;

[0019] Figure 4 The utility model discloses a whole structure schematic diagram of assembled soil nail;

[0020] Figure 5 The utility model discloses Figure 4 The utility model discloses a schematic diagram of the structure of the soil nail rod body;

[0021] Figure 6 The utility model discloses Figure 4 The utility model discloses an end part fixing piece structure schematic diagram.

[0022] Symbol explanation in drawing

[0023] 1, retaining plate, 2, crossbeam, 3, stand, 4, assembled soil nail, 5, prestressed anchor rod, 6, anchor rod support, 7, anchoring section, 8, free hinge, 9, soil nail rod body, 10, metal pipe, 11, anchorage device, 12, pressure plate, 13, end cap nut, 14, end part fixing piece, 15, thickened nut, 16, round steel, 17, PVC pipe, 18, threading, 19, anchoring plate, 20, square ring, 21, ribbed plate. Specific implementation

[0024] The technical scheme in the embodiments of the utility model will be apparently and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0025] As Figures 1-6 Illustrate the flexible hinge support structure of a composite frame anchoring system of the embodiment as shown,

[0026] The flexible hinge support structure of a composite frame anchoring system includes retaining plate 1, crossbeam 2, stand 3, assembled soil nail 4, prestressed anchor rod 5, anchor rod support 6, free hinge 8;

[0027] The flexible hinge support structure of a composite frame anchoring system is in grid shape, and prestressed anchor rod 5 is the node of the grid, prestressed anchor rod 5 is sleeved into anchor rod support 6, anchor rod support 6 is connected with crossbeam 2 and stand 3 through free hinge 8, the four sides of retaining plate 1 are connected with crossbeam 2 and stand 3, and assembled soil nail 4 is inserted into the inside of foundation pit slope through the center of retaining plate 1;

[0028] The portion of the prefabricated soil nail 4 protruding from the soil is anchored to the retaining plate 1 by the end fixing member 14. A thickened nut 15 is installed on the threaded 18 of the round steel 16 extending beyond the end fixing member 14. One end of the soil nail rod 9 is inserted into the metal pipe 10 inside the soil. A chemical structural adhesive is injected between the metal pipe 10 and the soil nail rod 9. The metal pipe 10 is anchored to the bearing plate 12 by the anchor 11. The threaded 18 at one end of the round steel 16 is screwed into the end cap nut 13. The bearing plate 12 and the end cap nut 13 are welded and fixed.

[0029] The specific construction method for the prefabricated soil nailing in this plan is as follows:

[0030] Based on the anchoring depth, prefabricated soil nails 4 are fabricated in advance. Hole positions are determined at the geometric center of the grid unit formed by the frame structure. The prefabricated soil nails 4 are inserted into the holes as close as possible to the center of the borehole. The threaded end of the soil nail rod 9, inserted into the slope of the foundation pit, is tightened with the end cap nut 13. A auger drill is used to drive the prefabricated soil nails 4 into the soil to the designed depth. The portion of the prefabricated soil nail 4 protruding from the soil is anchored to the retaining plate 1 by the end fixing member 14. Finally, the thickened nut 15 is rotated to achieve the anchoring of the prefabricated soil nail 4.

[0031] The retaining plate 1 transmits the earth pressure to the crossbeam 2 and the column 3, and then through the anchor support 6 and the free hinge 8 to the anchoring section 7 of the prestressed anchor 5.

[0032] In composite frame anchoring support, the frame serves as a medium connecting the slope and the anchor rods. It can not only effectively disperse the high stress state of the anchor rod prestress at the intersection of the frame beam and column, so that the slope is reasonably stressed and prevents local plastic failure, but also adjust the stress state between the anchor rods, giving full play to the role of each anchor rod in the support process.

[0033] By connecting the frames with hinges, the anchoring force can be transferred to the frame through the hinges, which will generate a certain stress adjustment in the soil of the slope and limit the sliding of the slope; it will also release the rotational freedom of the anchor rods, reduce the stress concentration at the contact points between the anchor rods and the frame, and thus avoid the failure of the support itself; this hinged flexible support allows for moderate deformation of the slope as a whole and the support system, thereby generating slope energy dissipation, slowing down the slope failure rate and enhancing slope stability.

[0034] The retaining plate 1 is a plate-shaped component made of precast concrete slabs, which is installed within the grid formed by the crossbeams 2 and the columns 3 to form a retaining unit.

[0035] A layer of PVC pipe 17 is fitted onto the round steel 16 of the soil nail rod 9.

[0036] The end fixing member 14 is composed of an anchor plate 19, a square ring 20 and a rib plate 21, the anchor plate 19 is a ribbed hexagonal steel plate, the square ring 20 is arranged in the center, and the rib plate 21 is fixed to the side of the anchor plate 19 by welding. The round steel 16 passes through the square ring 20 in the middle of the anchor plate 19, and the anchor plate 19 and the soil nailing rod body 9 are fixed by the thickened nut 15.

[0037] In the framework prestressed anchor rod support, the assembled soil nailing is added, various components of the soil nailing are assembled into an organic whole, the soil body pressure and other external forces are borne together, the shear strength of the soil body is improved, various components can be prefabricated in a factory, only simple assembling and installation work needs to be carried out on site, the time and workload of on-site construction are reduced, the construction efficiency is improved, the dust pollution and building waste on the construction site are reduced, meanwhile, the dismounting and recycling characteristics of the assembled soil nailing also meet the requirements of environmental protection and sustainable development.

[0038] The above describes the embodiments of the utility model. It should be understood that the utility model is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in the ordinary way in the art; any person skilled in the art can make possible changes and modifications to the technical scheme of the utility model or modify it into equivalent embodiments using the disclosed methods and technical contents without departing from the scope of the technical scheme of the utility model, which does not affect the essential content of the utility model.

Claims

1. A flexible hinged support structure of a composite framed anchorage system, characterised in that: It comprises a retaining board (1), a cross beam (2), a stand column (3), an assembled soil nail (4), a prestressed anchor rod (5), an anchor rod support (6), and a free hinge (8). The flexible hinge supporting structure of the composite frame anchoring system is in a grid shape, with the prestressed anchor rod (5) as the node of the grid, the prestressed anchor rod (5) being sleeved into the anchor rod support (6), the anchor rod support (6) being connected with the cross beam (2) and the stand column (3) through the free hinge (8), the retaining board (1) being connected with the cross beam (2) and the stand column (3) at four edges, and the assembled soil nail (4) being inserted into the interior of a foundation pit slope through the center of the retaining board (1). The part of the assembled soil nail (4) exposed outside the soil body is anchored to the retaining board (1) by an end fixing member (14), a thickened nut (15) is installed on a thread sleeve (18) of a round steel (16) exceeding the end fixing member (14), a soil nail rod body (9) is inserted into a metal pipe (10) at one end inside the soil body, a chemical structural adhesive is injected between the metal pipe (10) and the soil nail rod body (9), the metal pipe (10) is anchored to a pressure bearing plate (12) by an anchor (11), the thread sleeve (18) of the round steel (16) is screwed into an end cap nut (13), and the pressure bearing plate (12) and the end cap nut (13) are welded and fixed. The retaining board (1) transmits the earth pressure to the cross beam (2) and the stand column (3), and then transmits the earth pressure to the anchoring section (7) of the prestressed anchor rod (5) through the anchor rod support (6) and the free hinge (8).

2. A flexible hinged support structure of a composite framed anchorage system according to claim 1, characterised in that: The retaining board (1) is a plate-shaped member made of a prefabricated concrete plate, which is installed in the grid formed by the cross beam (2) and the stand column (3) to form a retaining unit.

3. A flexible hinged support structure of a composite frame anchoring system according to claim 1, characterized in that: The round steel (16) of the soil nail rod body (9) is sleeved with a layer of PVC pipe (17) on the rod body.

4. A flexible hinged support structure of a composite frame anchoring system according to claim 1, characterized in that: The end fixing member (14) is composed of an anchoring plate (19), a square ring (20), and a rib plate (21), the anchoring plate (19) is a ribbed hexagonal steel plate, the square ring (20) is arranged at the center, and the rib plate (21) is fixed to the side surface of the anchoring plate (19) by welding; the round steel (16) passes through the square ring (20) in the middle of the anchoring plate (19), and the anchoring plate (19) and the soil nail rod body (9) are fixed by the thickened nut (15).

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