Supporting structure of foundation pit slope

Abstract

The utility model discloses a supporting structure of a foundation pit slope, which comprises a nailing wall laid on the slope surface, the nailing wall comprises a soil nail with a hollow anchor pipe as a main body, the soil nail comprises a base end and a tip end which are opposite to each other, and a plurality of grout overflow holes are uniformly distributed on a pipe body of the soil nail close to the direction of the tip end. Barbs are uniformly distributed on the soil nail pipe body between the slurry overflow hole and the tip end; the tip ends of the soil nails are inserted into reserved drill holes evenly distributed in the slope surface, after grouting and solidification are conducted in the drill holes through the soil nail anchor pipes, the base ends of the soil nails are welded to a first reinforcing mesh laid on the slope surface, and concrete is sprayed and covered on the surface of the first reinforcing mesh to form a concrete surface layer. The soil nail supporting structure is simple in structure, stable and reliable in supporting, convenient to mount and dismount, and low in manufacturing cost.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the construction technical field of foundation pit side slope especially relates to a supporting structure of foundation pit side slope. BACKGROUND

[0002] The foundation pit is the soil pit excavated according to the foundation design position, base elevation and foundation plane size, and the foundation pit support is usually needed to be set to ensure the safety of underground structure construction and the surrounding environment of the foundation pit, the foundation pit support is the supporting, reinforcing and protecting measures for the side wall and surrounding environment of the foundation pit, and the foundation pit support is subjected to the earth pressure from both sides of the foundation pit.

[0003] The foundation pit support in the prior art usually adopts the form of baffle plus stake, which is usually first excavated into the foundation pit, then sets the baffle, then punches the stake, and finally sets the steel frame between the stakes, and the steel frame is generally connected by welding, since no prestress is applied during construction, the effect of resisting earth pressure is general, and the steel frame needs to be welded into shape, so the installation and disassembly are troublesome and can easily delay the construction period.

[0004] In summary, the prior art has the technical problems of troublesome installation and disassembly, general effect of resisting earth pressure and no prestress. UTILITY MODEL CONTENTS

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the purpose of the utility model is to provide a supporting structure of foundation pit side slope.

[0006] The utility model is realized in this way, a supporting structure of foundation pit side slope, the supporting structure includes the nail wall that is laid on the slope face, the nail wall includes the soil nail with the hollow anchor pipe as the main body, the soil nail includes two opposite base ends and pointed ends, the soil nail pipe body in the pointed end direction is uniformly distributed with a plurality of overflow holes, and the soil nail pipe body between the overflow hole and the pointed end is uniformly distributed with barbs, wherein the soil nail pointed end is inserted into the uniformly distributed reserved drill hole on the slope face, after grouting and solidification in the drill hole through the soil nail anchor pipe, the soil nail base end is welded on the first steel mesh laid on the slope face, the first steel mesh surface is sprayed and covered with concrete to form a concrete surface layer.

[0007] Preferably, the soil nail further includes the L-shaped nail head bar that is symmetrically welded on the two opposite sides of the anchor pipe base end, and the nail head bar is welded on the first steel mesh in cooperation with the reinforcing bar.

[0008] Preferably, the barb is the reinforcing bar welded on the soil nail pipe body and inclined towards the soil nail base end direction.

[0009] Preferably, the soil nail is arranged on the first steel mesh in the plum blossom shape.

[0010] Preferably, the supporting structure further comprises an anchoring base arranged on the slope top, the anchoring base comprising a second steel mesh laid on the slope top and a concrete layer cast on the second steel mesh, the first steel mesh being integrally connected with the second steel mesh at the joint.

[0011] Preferably, the anchoring base further comprises ground anchors inserted into the ground of the slope top at the ends, the base ends of the ground anchors being welded on the second steel mesh.

[0012] Compared with the defects and deficiencies of the prior art, the utility model has the following beneficial effects: the utility model has the advantages of simple structure, stable and reliable support, convenient installation and disassembly, low cost of soil nailing and supporting structure. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a side structure schematic view of the supporting structure of the utility model;

[0014] Figure 2 is a partial enlarged structure schematic view of Figure 1 ; is a side structure schematic view of the supporting structure of the utility model;

[0015] Figure 3 is a distribution schematic view of the soil nailing of the supporting structure of the utility model under the front view angle;

[0016] Figure 4 is a layout view of the steel mesh and the soil nailing of the supporting structure of the utility model under the perspective view;

[0017] Figure 5 is a partial enlarged structure schematic view of the soil nailing of the utility model after being welded on the first steel mesh with the nail head rib;

[0018] Figure 6 is a pipe body structure schematic view of the soil nailing of the utility model arranging the slurry overflow hole section;

[0019] Figure 7 is a pipe body structure schematic view of the soil nailing of the utility model arranging the barb section. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model is further described in detail below by combining with the drawings and examples.

[0021] As shown in Figures 1-7 , wherein, Figure 1 is a side structure schematic view of the supporting structure of the utility model; Figure 2 is a partial enlarged structure schematic view of Figure 1 ; is a side structure schematic view of the supporting structure of the utility model; Figure 3It is the distribution diagram of the soil nail of the supporting structure under the front view angle of the utility model; Figure 4 It is the layout diagram of the reinforcing mesh and the soil nail under the three-dimensional view angle of the supporting structure of the utility model; Figure 5 It is the local enlarged structure diagram of the soil nail after the nail head reinforcing bar is welded on the first reinforcing mesh in the utility model; Figure 6 It is the pipe body structure diagram of the soil nail arranged with the slurry overflow hole section in the utility model; Figure 7 It is the pipe body structure diagram of the soil nail arranged with the barb section in the utility model.

[0022] The utility model discloses a supporting structure of foundation pit slope, the supporting structure includes the nail wall that is laid on the slope face, the nail wall includes the soil nail 1 that the main body is hollow anchor pipe, the soil nail 1 includes two opposite base end and tip, the soil nail 1 pipe body in the tip direction close to is evenly distributed with several slurry overflow holes 2, and the soil nail 1 pipe body between slurry overflow hole 2 with the tip is evenly distributed with barb 3, wherein, the soil nail 1 tip inserts the evenly distributed reserved drill hole on the slope face, through the grouting of soil nail 1 anchor pipe into the drill hole and solidification, the base end of soil nail 1 is welded on the first reinforcing mesh 4 that is laid on the slope face, and the first reinforcing mesh 4 surface sprays and covers concrete to form concrete surface layer 5.

[0023] In the utility model embodiment, the anchor pipe of soil nail 1 adopts steel flower pipe (processes with φ48mm*3mm steel pipe), and the length of soil nail 1 is correspondingly adjusted by splicing welding according to the drill hole depth.

[0024] In the utility model embodiment, slurry overflow hole 2 is used to overflow the grouting in anchor pipe into the drill hole, and in actual application, slurry overflow hole 2 (aperture is 10mm) is oppositely arranged, and the distance between slurry overflow hole 2 is 300mm.

[0025] In the utility model embodiment, barb 3 is used to ensure the stable connection of soil nail 1 and the solidified grouting in the drill hole, and the barb 3 is reinforcing bar welded on the soil nail 1 pipe body and inclined to the base end of soil nail 1, can be arranged at the position close to end 1.5~2.0m, and the reinforcing bar selects φ16 reinforcing bar.

[0026] In the utility model embodiment, to make the overall structure of nail wall more stable, soil nail 1 is arranged on the first reinforcing mesh 4 in the shape of plum blossom.

[0027] In the utility model embodiment, the general incidence angle of soil nail 1 on the slope face is 15 °, and the soil nail 1 is knocked into the drill hole in the slope face by using mechanical knock-in type construction technology, therefore, the tip of soil nail 1 can be welded into a sharp head by steel reinforcing bar.

[0028] In the embodiment of the utility model, the grouting pump is connected with the base end of the exposed anchor pipe directly through the grouting pipe, and the slurry flows out from the slurry overflow hole 2 near the tip of the anchor pipe under the pressure, and gradually fills the inner and outer space of the anchor pipe from inside to outside to the orifice, the grouting pump is closed, and the slurry is supplemented once after standing for 30 min; the cement for grouting adopts the ordinary portland cement of 42.5 grade, and the cement slurry is prepared according to the water-cement ratio of 0.45-0.55, and the slurry filling coefficient is greater than or equal to 1. Before the grouting body is finally set, the soil nail 1 pipe body should not be hammered and collided. When unknown obstacles or underground pipelines are encountered during drilling, the position of the soil nail 1 and the hole forming angle can be adjusted to avoid forcibly penetrating the unknown obstacles or underground pipelines.

[0029] After grouting and solidification, the main reinforcement of the first reinforcement mesh 4 is laid on the slope, and the main reinforcement is directly welded on the base end of the soil nail 1 for positioning during the laying process, and other reinforcement is overlapped to form the first reinforcement mesh 4 laid on the slope, and in actual application, the first reinforcement mesh 4 adopts the specification of φ6.0@200*200mm. Finally, according to the actual operation requirement, the concrete is sprayed on the first reinforcement mesh 4 to form the concrete surface layer 5, and after the concrete surface layer 5 is solidified, the concrete surface layer 5, the first reinforcement mesh 4 and the soil nail 1 form an integral and stable nail wall, which plays a good supporting role on the foundation pit slope.

[0030] In the further implementation process, to ensure the stable connection of the soil nail 1 and the first reinforcement mesh 4, in the embodiment of the utility model, preferably, the soil nail 1 further comprises L-shaped nail head reinforcement 6 symmetrically welded on the two opposite sides of the base end of the anchor pipe, and the nail head reinforcement 6 is welded on the first reinforcement mesh 4 in cooperation with the reinforcing rib. Specifically, in the embodiment of the utility model, the L-shaped nail head reinforcement 6 is welded on the base end of the soil nail 1, and is welded with the two adjacent horizontal reinforcing ribs, and then is welded with the first reinforcement mesh 4 to form a stable whole.

[0031] In the further implementation process, to further strengthen the stability of the supporting structure, in the embodiment of the utility model, preferably, the supporting structure further comprises an anchoring foundation arranged on the slope top, the anchoring foundation comprises a second reinforcement mesh 7 laid on the slope top and a concrete layer 8 poured on the second reinforcement mesh 7, and the first reinforcement mesh 4 is integrally connected at the abutting place of the second reinforcement mesh 7.

[0032] In the further implementation process, to further strengthen the stability of the anchoring foundation, in the embodiment of the utility model, preferably, the anchoring foundation further comprises a ground anchor 9 stably inserted into the ground of the slope top, and the base end of the ground anchor is welded on the second reinforcement mesh 7.

[0033] In actual application constitution, the construction process of the utility model is: excavating working face, trimming side slope → measuring and laying out hole → slope top ground anchor 9 construction → slope surface drilling, hole cleaning, soil nail 1 installation, grouting → laying, fixing first steel bar net 4, second steel bar net 7 → pouring concrete layer 8, spraying concrete surface layer 5, curing → excavating next layer working face, repeating the above work until completion.

[0034] The utility model has the advantages of simple structure, stable and reliable support, convenient installation and dismounting, low cost of soil nail 1 and overall support structure.

[0035] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement etc. in the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A support structure for a foundation pit slope, characterized by, The supporting structure comprises a nail wall laid on the slope surface, the nail wall comprises soil nails with hollow anchor pipes as the main body, the soil nails comprise two opposite base ends and pointed ends, a plurality of grout overflow holes are uniformly distributed on the soil nail pipe body in the direction close to the pointed end, and barbs are uniformly distributed on the soil nail pipe body between the grout overflow holes and the pointed end; wherein the soil nail pointed ends are inserted into the uniformly distributed pre-drilled holes on the slope surface, after grouting and solidification of the soil nail anchor pipes into the holes, the soil nail base ends are welded on the first steel mesh laid on the slope surface, the first steel mesh surface is sprayed and covered with concrete to form a concrete surface layer.

2. The support structure of claim 1, wherein, The soil nail further comprises L-shaped nail head reinforcement symmetrically welded on the two opposite sides of the anchor pipe base end, and the nail head reinforcement is welded on the first steel mesh in cooperation with the reinforcing bars.

3. The support structure of claim 1, wherein, The barb is a reinforcing bar welded on the soil nail pipe body and inclined towards the soil nail base end.

4. The support structure of claim 1, wherein, The soil nails are arranged in a plum blossom shape on the first steel mesh.

5. The support structure of claim 1, wherein The supporting structure further comprises an anchoring foundation arranged on the slope top, the anchoring foundation comprises a second steel mesh laid on the slope top and a concrete layer poured on the second steel mesh, and the first steel mesh and the second steel mesh are integrally connected at the joint.

6. The support structure of claim 5, wherein, The anchoring foundation further comprises earth anchors stably inserted into the ground of the slope top at the end, and the base ends of the earth anchors are welded on the second steel mesh.

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