Soil nailing wall supporting structure for sloping, net hanging and guniting

Abstract

The utility model provides a sloping hanging net guniting soil nailing wall supporting structure which comprises pre-stressed anchor rods, soil nails, a hanging net, a safety fence and channel steel, the soil nails and the pre-stressed anchor rods are arranged on the slope surface of a deep foundation pit in a penetrating mode, a plurality of rows of soil nails are arranged at intervals in a penetrating mode, a plurality of pre-stressed anchor rods are arranged at intervals in a penetrating mode, and the hanging net is laid on the slope surface of the deep foundation pit. The soil nails and the pre-stressed anchor rods penetrate through the hanging net, a concrete layer is sprayed on the surface of the hanging net and wraps the hanging net, the soil nails and the pre-stressed anchor rods, a safety fence is arranged on the upper portion of the slope of the deep foundation pit, the pre-stressed anchor rods are formed by connecting two steel channels in parallel to serve as a waist beam, and the sloping ratio of the slope of the deep foundation pit is 1: 0.5; the slurry strength of cement slurry adopted by the concrete layer is M25, and the spraying thickness is 80 mm. The soil nailing wall supporting structure for slope setting, net hanging and guniting is high in overall supporting structure strength and capable of effectively resisting tensile stress and lateral pressure of a soil body.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of building engineering, especially relates to a soil nailing wall supporting structure of slope placing net spraying. BACKGROUND

[0002] The soil nailing wall supporting structure is a commonly used foundation pit supporting method, and is particularly suitable for medium-depth foundation pits (usually 5-15 meters). The soil nailing wall is formed by driving soil nails (usually steel bars or steel pipes) into the soil body and combining with the sprayed concrete surface layer, so as to form an integrated supporting structure, thereby improving the stability and safety of the foundation pit slope.

[0003] At present, during construction, the deep foundation pit often encounters the condition that the soil body softens due to high underground water level and much precipitation, the internal friction angle and cohesion of the soil body are reduced, the stability of the soil body is affected, the instability of the foundation pit slope construction is increased, and the supporting difficulty is increased. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model aims at providing a soil nailing wall supporting structure of slope placing net spraying, so as to solve the problem that the soil body softens due to high underground water level and much precipitation during construction, the internal friction angle and cohesion of the soil body are reduced, the stability of the soil body is affected, the instability of the foundation pit slope construction is increased, and the supporting difficulty is increased.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a soil nailing wall supporting structure of slope placing net spraying, including, prestressed anchor rod, soil nail, net, safety fence, channel steel, the soil nail and the prestressed anchor rod are arranged in the deep foundation pit slope, the soil nail is arranged in several rows at intervals, the prestressed anchor rod is arranged in several rows at intervals, the net is laid on the deep foundation pit slope, the soil nail and the prestressed anchor rod are arranged in the net, the surface of the net is sprayed with a concrete layer, the concrete layer covers the net, soil nail and prestressed anchor rod, the safety fence is arranged on the upper portion of the deep foundation pit slope, the prestressed anchor rod is parallel to two channel steels as waist beam, the slope ratio of the deep foundation pit slope is 1:0.5, the slurry strength M25 of cement slurry is used for the concrete layer, and the spraying thickness is 80mm.

[0007] Further, the inclination angle of any soil nail is 10 DEG, the horizontal spacing of the soil nail is 1.5m, and the soil nail is arranged in a plum blossom shape.

[0008] Further, the diameter of the soil nail is 18mm, and the length of the soil nail from top to bottom is 7m, 12m, 10m, 8m and 6m in sequence.

[0009] Further, the horizontal interval of the prestressed anchor rod is 1.5 m, the anchor rod diameter is 150 mm, and the inclination angle of any prestressed anchor rod is 10°.

[0010] Further, the anchor cable main reinforcement of the prestressed anchor rod adopts 2 bundles of 1860-grade prestressed steel strands.

[0011] Further, the hanging net adopts a steel mesh with a diameter of 6, the interval is 250*250 mm, and one transverse reinforcement with a diameter of 14 mm is arranged at each soil nail of the hanging net, and the transverse reinforcement and the soil nail anchor head are connected by double "L" hook welding.

[0012] Compared with the prior art, the soil nailing wall supporting structure of the benching hanging net shotcreting has the following advantages:

[0013] In the soil nailing wall supporting structure of the benching hanging net shotcreting, the cement slurry strength is M25, which can provide better supporting structure strength, ensure the stability and durability of the sprayed concrete surface layer, and at the same time, the tensile strength is also high, which can effectively resist the tensile stress of the soil body and prevent the surface layer of the soil nailing wall from cracking. Two channel steels are arranged in parallel to form an integral waist beam, which can significantly improve the stiffness of the waist beam and reduce the deformation under the action of load. The increased stiffness of the waist beam can better resist the lateral pressure of the soil body and improve the stability of the entire supporting structure. BRIEF DESCRIPTION OF DRAWINGS

[0014] The drawings forming part of this application provide further understanding of the present application, and the illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0015] In the drawings:

[0016] Fig. 1 The soil nailing wall supporting structure of the benching hanging net shotcreting is shown in the schematic view of the embodiment of the present application.

[0017] Fig. 2 The enlarged schematic view of position A in the soil nailing wall supporting structure of the benching hanging net shotcreting is shown in the embodiment of the present application.

[0018] Fig. 3 The cross-sectional view of the soil nailing and the hanging net in the soil nailing wall supporting structure of the benching hanging net shotcreting is shown in the embodiment of the present application.

[0019] Explanation of reference signs:

[0020] 1, prestressed anchor rod; 2, soil nailing; 3, hanging net; 4, concrete layer; 5, safety fence; 6, channel steel; 7, transverse reinforcement. DETAILED DESCRIPTION

[0021] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0022] In the description of the utility model, it needs to be understood that the orientation or position relation indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0023] In the description of the utility model, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between the two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0025] Referring to Figs. 1-3 As shown in the drawings, the embodiment provides a soil nailing wall supporting structure for slope hanging net spraying, prestressed anchor rod 1, soil nailing 2, hanging net 3, safety fence 5, channel steel 6, soil nailing 2 and prestressed anchor rod 1 are arranged on the deep foundation pit slope, soil nailing 2 is arranged in several rows at intervals, prestressed anchor rod 1 is arranged in several rows at intervals, hanging net 3 is laid on the deep foundation pit slope, soil nailing 2 and prestressed anchor rod 1 are arranged in the hanging net 3, the surface of the hanging net 3 is sprayed with a concrete layer 4, the concrete layer 4 covers the hanging net 3, soil nailing 2 and prestressed anchor rod 1, a safety fence 5 is arranged on the upper part of the deep foundation pit slope, the prestressed anchor rod 1 is connected in parallel with two channel steels 6 as a waist beam, the slope ratio of the deep foundation pit is 1:0.5, the slurry strength M25 of the cement slurry is used for the concrete layer 4, and the spraying thickness is 80mm.

[0026] Specifically, in the embodiment, the inclination angle of any soil nailing 2 is 10°, the horizontal spacing of the soil nailing is 1.5m and is arranged in a plum blossom shape.

[0027] Specifically, in this embodiment, the soil nail 2 has a diameter of 18 mm, and the soil nail length from top to bottom is 7 m, 12 m, 10 m, 8 m, and 6 m, respectively.

[0028] Specifically, in this embodiment, the prestressed anchor rod 1 has a horizontal spacing of 1.5 m, and the anchor rod has a diameter of 150 mm. The inclination angle of any prestressed anchor rod 1 is 10°.

[0029] Specifically, in this embodiment, the anchor cable main reinforcement of the prestressed anchor rod 1 uses two bundles of 1860-grade prestressed steel strands.

[0030] Specifically, in this embodiment, the hanging net 3 uses a φ6 steel mesh with a spacing of 250×250 mm. A transverse reinforcement 7 with a diameter of 14 mm is arranged at each soil nail 2 outside the hanging net 3. The transverse reinforcement 7 and the soil nail anchor head are connected by double "L" hook welding.

[0031] In this embodiment, the concrete layer 4 uses cement paste with a water-cement ratio of 0.5-0.55, and the paste strength is M25. The spraying thickness is 80 mm.

[0032] In this embodiment, the soil nails are all made of 1E18 threaded steel, and the soil nails are arranged in a plum blossom type. The soil nail diameter is 100 mm, and the inclination angle is 10°. The normal pressure is filled with cement paste with a water-cement ratio of 0.5. The soil nail wall panel uses a d6@250 mm×250 mm steel mesh. The steel mesh outside each soil nail is connected with a 1E14 transverse reinforcement by double "L" hook welding. The soil nail wall surface is sprayed with 80 mm thick C20 concrete with a flange width of 800 mm. The horizontal spacing between the soil nails is 1.5 m. d represents HPB300-grade round steel, and E represents HRB400-grade threaded steel.

[0033] The transverse reinforcement structure enhances the connection between the soil nails and the steel mesh, and improves the stability and bearing capacity of the entire supporting structure.

[0034] When the height of the foundation pit slope is 10.51 m, the soil nailing wall supporting structure with the above-mentioned slope hanging net spraying is adopted, the actual effective supporting height is 10.51 m, 5 rows of soil nails are arranged, 2 courses of prestressed anchor rods are arranged, and the slope ratio is 1:0.5. The soil nailing wall supporting structure adopts slope surface reinforcing bars, the diameter of the soil nails is 18 mm, the length is 7 m, 12 m, 10 m, 8 m and 6 m, and the inclination angle is 10°. The prestressed anchor rods are all arranged with 2 20b channel steels in parallel as waist beams, the horizontal spacing is 1.5 m, the anchor rod diameter is 150 mm, the inclination angle is 10°, and 2 bundles of 1860-grade prestressed steel wires are selected as the anchor cable main reinforcement. The cement slurry with a water-cement ratio of 0.5-0.55 is adopted for grouting, the slurry strength is M25. The steel mesh is made of φ6 three-grade steel, the spacing is 250*250 mm, the steel waist beam should be welded firmly during processing, and the size is accurate. In the soil nailing wall supporting structure, the soil nails and anchor cables for supporting are sequentially arranged from top to bottom as follows: the soil nail support with a length of 7 m (including a hook), the first layer of prestressed anchor rod support, the soil nail support with a length of 12 m (including a hook), the second layer of prestressed anchor rod support, the soil nail support with a length of 10 m (including a hook), the soil nail support with a length of 8 m (including a hook), the soil nail support with a length of 6 m (including a hook), and the length of the first layer of prestressed anchor rod support is 5 m of a free end and 12 m of an anchoring section, and the length of the second layer of prestressed anchor rod support is 5 m of a free end and 14 m of an anchoring section.

[0035] Construction deviation control: (1) the allowable deviation of the soil nailing wall hole depth: +100 m; (2) the allowable deviation of the hole diameter: +20 mm to -5 mm; (3) the allowable deviation of the soil nail length: +30 mm; (4) the allowable deviation of the soil nail position (horizontal and vertical): ±100 mm; (5) the allowable deviation of the hole inclination: ±1°; (6) the allowable deviation of the grouting amount: >1; (7) the allowable deviation of the soil nailing wall surface layer thickness: ±10 mm; and (8) the allowable deviation of the steel mesh protective layer thickness: ≥20 mm.

[0036] The soil nailing wall supporting structure with the slope hanging net spraying adopts the cement slurry with a slurry strength of M25, which can provide better supporting structure strength, ensure the stability and durability of the sprayed concrete surface layer, and has higher tensile strength, which can effectively resist the tensile stress of the soil and prevent the soil nailing wall surface layer from cracking. Two channel steels are arranged in parallel to form a whole waist beam, which can significantly improve the stiffness of the waist beam and reduce the deformation under the load. The increased stiffness of the waist beam can better resist the lateral pressure of the soil and improve the stability of the whole supporting structure.

[0037] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A soil nailing wall support structure with slope protection, wire mesh installation, and shotcrete application, characterized in that, It includes prestressed anchor rod (1), soil nail (2), hanging net (3), safety fence (5), channel steel (6), the soil nail (2) and the prestressed anchor rod (1) are arranged in deep foundation pit slope, the soil nail (2) is arranged in several rows at intervals, the prestressed anchor rod (1) is arranged in several rows at intervals, the deep foundation pit slope is laid the hanging net (3), the soil nail (2) and the prestressed anchor rod (1) are arranged in the hanging net (3), the surface of the hanging net (3) is sprayed concrete layer (4), the concrete layer (4) covers the hanging net (3), soil nail (2) and prestressed anchor rod (1), the upper portion of the deep foundation pit slope is provided with the safety fence (5), the prestressed anchor rod (1) is parallel to two channel steel (6) as waist beam, the deep foundation pit slope is 1:0.5, the slurry strength M25 of concrete layer (4) is used cement slurry, and the spraying thickness is 80mm.

2. The soil nailing wall structure of the sloping shotcrete as claimed in claim 1, wherein, Any soil nail (2) is 10 °, and the horizontal spacing of soil nail is 1.5m and is arranged in the form of plum blossom.

3. The soil nailing wall support structure of claim 2, wherein, The diameter of soil nail (2) is 18mm, and the length of soil nail from top to bottom is 7m, 12m, 10m, 8m and 6m.

4. The soil nailing wall support structure of claim 1, wherein, The horizontal spacing of prestressed anchor rod (1) is 1.5m, the anchor rod aperture is 150mm, and the inclination of any prestressed anchor rod (1) is 10 °.

5. The soil nailing wall structure of the sloping shotcrete according to claim 4, characterized in that, The anchor cable main reinforcement of prestressed anchor rod (1) uses 2 bundles of 1860 grade prestressed steel wire.

6. The soil nailing wall structure of the sloping diaphragm shotcrete according to claim 1, wherein, The hanging net (3) uses φ6 steel mesh, and the spacing is 250x250mm, one transverse reinforcement (7) with a diameter of 14mm is arranged at each soil nail (2) outside the hanging net (3), and the transverse reinforcement (7) and the soil nail anchor head are connected by double "L" hook welding.

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