A kind of building deep foundation pit slope support structure

Abstract

The utility model discloses a building deep foundation pit slope support structure, including a polymer composite slope protection board, on which a plurality of anchor rods are vertically inserted, and one end of the plurality of anchor rods exposed outside the slope body is bundled together with the anchor rods by fine steel wires to form a cross-shaped grid structure. The fine steel wires are wound around the ends of the anchor rods to form a spiral steel wire bundle, and are locked by fasteners on the outside of the spiral steel wire bundle. The utility model uses anchor rods and polymer composite slope protection boards for joint reinforcement, and the anchor rods are locked and bundled by fine steel wires to form a lattice structure, and are locked by fasteners to increase the tensile strength between each other, increase the structural strength and the tightness of the connection, improve the protection effect, ensure the stability of the slope, and form an overall slope system that can bear the load. The anchor rods can be fixed with a small amount of concrete during the support process, or even without concrete, thereby greatly saving the amount of concrete, saving construction time, and reducing pollution to the air, water and soil.

Description

Technical Field

[0001] The utility model relates to the technical field of slope management, in particular to a building deep foundation pit slope supporting structure. Background Art

[0002] In the construction foundation pit slope support project, foundation pit slope support refers to the support, reinforcement and protection measures for the side walls of the foundation pit and the surrounding environment in order to ensure the safety of the surrounding environment of the foundation pit and reduce soil erosion. When the foundation pit project adopts the slope method or soil nail wall support form, a protective surface layer must be set up on the temporary slope. At present, the foundation pit slope protection surface layer mainly adopts a frame structure such as a steel mesh laid on the slope, and then sprayed concrete to form a support surface layer. However, this support surface layer is not in stable contact with the slope, and is easily damaged by factors such as settlement. The protection effect is poor, the stability is poor, and it is easy to crack, which leads to the loss of the retaining wall effect. In addition, during the construction process, sprayed concrete will also generate a lot of dust, causing air and water pollution, as well as waste of resources. Utility Model Content

[0003] In order to solve the technical problems mentioned in the background technology, the utility model provides a building deep foundation pit slope support structure.

[0004] The utility model adopts the following technical scheme: a building deep foundation pit slope support structure, comprising a polymer composite slope protection board laid on a slope body; a plurality of anchor rods are vertically inserted on the polymer composite slope protection board, and a plurality of the anchor rods are inserted into the slope; the plurality of the anchor rods are arranged in an array as a whole; one end of the plurality of the anchor rods exposed outside the slope body is bundled together with the anchor rods by fine steel wires to form a grid structure; the fine steel wires are wound around the ends of the anchor rods to form a spiral steel wire bundle, and the outside of the spiral steel wire bundle is locked by a fastener.

[0005] Furthermore, the anchor rod is inserted into the slope body to a depth within a range of 0.6-1 m, and concrete mortar is injected into the inserted hole for fixation, so as to enhance the connection strength between the anchor rod and the slope body.

[0006] Furthermore, the polymer composite slope protection board is in the shape of a long strip as a whole, including a base membrane surface layer, a waterproof surface layer, a protective surface layer and a load surface layer stacked and laid in sequence from the inside to the outside; the thickness of the base membrane surface layer is 1-3mm; the thickness of the waterproof surface layer, the protective surface layer and the load surface layer is 3-4mm.

[0007] Furthermore, the load surface layer is a geogrid.

[0008] Furthermore, the fastener includes a first arc-shaped clamping member and a second arc-shaped clamping member; both ends of the first arc-shaped clamping member and the second arc-shaped clamping member are tightened and enclosed on the outside of the spiral wire bundle by fastening bolts.

[0009] Compared with the prior art, the utility model has the following advantages: the building deep foundation pit slope support structure designed by the utility model is reinforced by anchor rods and polymer composite slope protection plates. The anchor rods are locked and tied by fine steel wires to form a frame structure, and locked by fasteners to increase the tensile strength between each other, increase the structural strength and the tightness of the connection, improve the protection effect, ensure the stability of the slope, and form an overall slope system that can bear the load. The anchor rods can be fixed with a small amount of concrete during the support process, or even without concrete, which can greatly save the amount of concrete, save construction time, make the construction site green and environmentally friendly, reduce pollution to the air, water and soil, and avoid waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model building deep foundation pit slope support structure;

[0011] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model building deep foundation pit slope support structure;

[0012] Figure 3 It is a cross-sectional view of the polymer composite slope protection board of the utility model;

[0013] Figure 4 It is a schematic diagram of the overall structure of the fastener of the utility model.

[0014] in:

[0015] 1-polymer composite slope protection board, 2-anchor rod, 3-thin steel wire, 4-fastener,

[0016] 11-base membrane surface layer, 12-waterproof surface layer, 13-protective surface layer, 14-load surface layer,

[0017] 41 - first arc-shaped clamping piece, 42 - second arc-shaped clamping piece, 43 - fastening bolt. DETAILED DESCRIPTION

[0018] In order to facilitate those skilled in the art to understand the technical solution of the utility model, further description is now made with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the utility model.

[0019] In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, it is apparent that one or more embodiments may be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0020] like Figure 1-2 As shown, it is a schematic diagram of the overall structure of the deep foundation pit slope support structure of the utility model, including a polymer composite slope protection board 1 laid on the slope body. When it is implemented, a plurality of drainage holes for drainage are set on the polymer composite slope protection board 1. A plurality of anchor rods 2 are vertically inserted on the polymer composite slope protection board 1, and a plurality of anchor rods 2 are inserted into the slope body, and a plurality of anchor rods 2 are arranged in an array as a whole. When it is implemented, the depth range of the anchor rod 2 inserted into the slope body is controlled between 0.6-1m, and part of the concrete mortar can be injected into the inserted hole according to the soil conditions for fixing, which is used to enhance the connection strength between the anchor rod 2 and the slope body. At the same time, it can also ensure that the polymer composite slope protection board 1 and the slope body have better stability. One end of the plurality of anchor rods 2 exposed outside the slope body is tied together with the anchor rod 2 by a thin steel wire 3 to form a grid structure. The thin steel wire 3 is wound around the end of the anchor rod 2 to form a spiral steel wire bundle, and the outside of the spiral steel wire bundle is locked by a fastener 4.

[0021] In this embodiment, the polymer composite slope protection board 1 is in the shape of a long strip, which is used to prevent surface water or rainwater from eroding the soil, causing soil collapse and affecting the foundation pit support. The polymer composite slope protection board is a laminated structure with waterproof, protective and reinforcement functions, which can better ensure the stability of the foundation pit slope, thereby ensuring the smooth construction of the foundation pit project. Figure 3 The figure shows a cross-sectional view of the polymer composite slope protection board of the utility model. In specific implementation, it includes a base membrane surface layer 11, a waterproof surface layer 12, a protective surface layer 13 and a load surface layer 14 which are sequentially stacked and laid from the inside to the outside. The base membrane surface layer 11 has a thickness of 1-3 mm. The waterproof surface layer 12, the protective surface layer 13 and the load surface layer 14 have a thickness of 3-4 mm.

[0022] Among them, the base membrane surface layer 11 can be made of plastic cloth or plastic film so that the main body of the surface layer can be rolled up or unfolded. The waterproof surface layer can be made of waterproof membrane, waterproof board or other flexible waterproof materials. The number can be one layer or multiple layers, which can be selected according to the construction environment and construction conditions. The protective surface layer is made of puncture-proof geotextile or other materials with puncture-proof function. The number can also be one layer or multiple layers. This application does not limit this. The load surface layer is a geogrid, which can specifically be a plastic geogrid or other mesh geogrid with bidirectional force-bearing capacity. The plastic geogrid is made of high-strength fiber as a whole, and is specially treated with polyethylene PE or polypropylene PP, and other additives are added. It is extruded to make it a composite high-strength tensile strip, which has the advantages of high strength, small creep, adaptability to various environmental soils, and can effectively improve the interlocking and biting effect of the bearing surface, greatly enhance the bearing capacity of the foundation, effectively restrain the lateral displacement of the soil, and enhance the stability of the foundation. The bidirectional geogrid is made of high molecular polymer through extrusion, plate forming, punching and then longitudinal and transverse stretching. It has great tensile strength in both longitudinal and transverse directions and can greatly increase the bearing capacity of the slope. Therefore, it can be selected according to the specific construction conditions.

[0023] like Figure 4 As shown, it is a schematic diagram of the overall structure of the fastener of the utility model, the fastener 4 includes a first arc-shaped clamping member 41 and a second arc-shaped clamping member 42; the first arc-shaped clamping member 41 and the second arc-shaped clamping member 42 are tightened and enclosed at both ends by fastening bolts 43 and arranged on the outside of the spiral steel wire bundle, which has the effect of clamping the thin steel wire 3 and pressing the polymer composite slope protection board.

[0024] The overall construction process of the deep foundation pit slope support structure provided in this embodiment is as follows:

[0025] Step S1: prefabricate the polymer composite slope protection board in the factory and transport it to the construction site;

[0026] Step S2: excavate the foundation pit in layers and sections and complete the slope trimming. Specifically, before excavating the foundation pit, the surrounding environment should be checked to ensure that there are no safety hazards. During construction, attention should be paid to closely observe the unsafe factors in the construction environment and take safety protection measures seriously. Ensure the flatness and slope of the slope, ensure that the foundation pit can be trimmed in time after excavation, and avoid the stability of the foundation pit slope being damaged due to long-term exposure to the open air or rain.

[0027] Step S3: paving the polymer composite slope protection board on the slope, and installing anchor nails in a grid pattern on the surface of the polymer composite slope protection board for fixing.

[0028] In the specific implementation process, since the foundation pit is excavated in a layered and segmented manner, the polymer composite slope protection board can be laid from top to bottom, and the polymer composite slope protection board is unfolded and laid on the slope along the length direction of the slope, and anchor nails are driven into the surface of the polymer composite slope protection board in a grid shape for fixing. Of course, if the depth of the foundation pit is shallow, the polymer composite slope protection board can also be unfolded and laid on the slope along the width direction of the slope after it is excavated at one time. This application does not impose any restrictions on the laying direction.

[0029] Step S4: Install a metal connector at the other end of the anchor to form a grid-like uniform stress-bearing surface on the polymer composite slope protection board.

[0030] Step S5: Install a fastener on the metal connector at the other end of the anchor, so that the metal connector presses the polymer composite slope protection board to make it close to the surface of the foundation pit slope. At the same time, the anchor, the metal connector and the fastener together form a complete slope surface that can bear the load.

[0031] In summary, the deep foundation pit slope support structure designed by the utility model is reinforced by anchor rods and polymer composite slope protection plates. The anchor rods are locked and tied by fine steel wires to form a frame structure, and locked by fasteners to increase the tensile strength between each other, increase the structural strength and the tightness of the connection, improve the protection effect, ensure the stability of the slope, and form an overall slope system that can bear the load. The anchor rods can be fixed with a small amount of concrete during the support process, or even without concrete, which can greatly save the amount of concrete, save construction time, make the construction site green and environmentally friendly, reduce pollution to the air, water and soil, and avoid waste of resources.

[0032] The above embodiments are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A building deep foundation pit slope support structure, characterized in that: The invention comprises a polymer composite slope protection board (1) laid on a slope body; a plurality of anchor rods (2) are vertically inserted on the polymer composite slope protection board (1), and the plurality of anchor rods (2) are inserted into the slope body; the plurality of anchor rods (2) are arranged in an array as a whole; the ends of the plurality of anchor rods (2) exposed outside the slope body are bundled together with the anchor rods (2) by means of fine steel wires (3) to form a grid structure; the fine steel wires (3) are wound around the ends of the anchor rods (2) to form a spiral steel wire bundle, and the outer side of the spiral steel wire bundle is locked by means of a fastener (4).

2. The building deep foundation pit slope support structure according to claim 1 is characterized in that: The anchor rod (2) is inserted into the slope body to a depth within a range of 0.6-1 m, and concrete mortar is injected into the inserted hole for fixation, so as to enhance the connection strength between the anchor rod (2) and the slope body.

3. The building deep foundation pit slope support structure according to claim 2 is characterized in that: The polymer composite slope protection board (1) is in the shape of a long strip as a whole, and comprises a base membrane surface layer (11), a waterproof surface layer (12), a protective surface layer (13) and a load surface layer (14) which are stacked and laid in sequence from the inside to the outside; the base membrane surface layer (11) has a thickness of 1-3 mm; the waterproof surface layer (12), the protective surface layer (13) and the load surface layer (14) have a thickness of 3-4 mm.

4. The building deep foundation pit slope support structure according to claim 3 is characterized in that: The load surface layer (14) is a geogrid.

5. The building deep foundation pit slope support structure according to claim 4 is characterized in that: The fastener (4) comprises a first arc-shaped clamping piece (41) and a second arc-shaped clamping piece (42); the first arc-shaped clamping piece (41) and the second arc-shaped clamping piece (42) are tightened and enclosed at both ends by fastening bolts (43) and arranged outside the spiral steel wire bundle.

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