Anchor rod and reinforced soil retaining wall connection structure

Abstract

The utility model discloses a connection structure of an anchor rod and a reinforced earth retaining wall, comprising an anchor rod, a connection assembly and a main reinforcement belt, wherein the connection assembly is arranged along the length direction of the slope; one end of the anchor rod is anchored in the slope, and the other end is arranged outside the slope; the outer end of the anchor rod is bent inward to form a U-shaped structure, and the connection assembly is arranged in the U-shaped structure and abuts against the end of the U-shaped structure; one end of the main reinforcement belt is fixedly connected to the connection assembly, and the other end extends in a direction away from the slope and is fixedly connected to the fill foundation outside the slope. The connection structure of the utility model greatly shortens the layout of the main reinforcement belt, thereby solving the technical problem that a large amount of original earthwork needs to be excavated when setting up a reinforced earth retaining wall under limited space conditions.

Description

Technical Field

[0001] The utility model belongs to the technical field of slope engineering, and in particular relates to a connection structure of an anchor rod and a reinforced earth retaining wall. Background Art

[0002] With the continuous advancement of infrastructure construction and urbanization, urban land is becoming increasingly scarce, and roadbed projects in limited spaces are becoming more and more important. In the construction of roads, bridges, municipal projects, etc., it is often necessary to carry out roadbed construction in a limited space, such as high filling and deep excavation, filling embankments, etc. If the construction is improper, it is easy to cause safety accidents such as landslides and collapses. At the same time, the noise and dust during construction will also affect the lives of surrounding residents. Therefore, these construction projects need to minimize the impact on the surrounding environment and residents while ensuring quality.

[0003] Reinforced earth retaining wall is a new type of retaining wall structure developed in recent years. It is a retaining structure that adds geosynthetics (i.e. "reinforcements") to the soil to enhance the strength of the soil. Reinforced earth retaining wall has the advantages of simple construction, low cost, and land saving. It can adapt to uneven deformation of the foundation, improve the strength and stability of the geotechnical structure, and limit the displacement of the soil. It can be used for permanent projects. The reinforced earth retaining wall consists of three parts: fill, high-strength main reinforcement belt made of geosynthetics arranged in the fill, and the outer side wall unit structure. There are interacting internal forces such as wall soil pressure, tension of the main reinforcement belt, and friction between the fill and the main reinforcement belt. These forces are balanced with each other, thus ensuring the stability of this complex. Reinforced earth retaining walls have more advantages than traditional retaining structures due to their large reinforced fill height, integrity, ecology and economy. They are increasingly used in related high fill retaining reinforcement projects and have been successfully applied in the protection of roads, railways, airports, water conservancy, embankment projects, etc., and have better realized the organic combination of engineering structure and ecological environment. However, the traditional reinforced earth retaining wall protection structure only considers protection from the mechanical perspective of the plane stress of the structure itself, and does not consider the impact of spatial distribution on structural design. For example, Figure 1 The available space distance shown is shorter than the limited space engineering condition of 0.5 times the fill slope height. This engineering condition cannot meet the main reinforcement belt layout space of the reinforced earth structure, which will cause the main reinforcement belt anchorage force and pull-out resistance to be insufficient, thus affecting the stability of the reinforced earth retaining wall. Figure 2 As shown, a large amount of stable soil outside the limited space needs to be excavated before the main reinforcement belt structure can be arranged in a suitable space. However, this will lead to increased construction costs, increased construction difficulty and extended construction period. Utility Model Content

[0004] In response to the current technical problems, the utility model aims to provide a connection structure between an anchor rod and a reinforced earth retaining wall, which can greatly shorten the layout of the main reinforcement belt, thereby solving the technical problem that a large amount of original earth excavation is required to set up a reinforced earth retaining wall under limited space conditions.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A connection structure of an anchor rod and a reinforced earth retaining wall, comprising an anchor rod and a main reinforcement belt; one end of the anchor rod is anchored in a slope, and the other end is arranged on the outside of the slope; its structural characteristics are: it also includes a connection component, which is arranged along the length direction of the slope; the outer end of the anchor rod is bent inward to form a U-shaped structure, the connection component is arranged in the U-shaped structure, and abuts against the end of the U-shaped structure; one end of the main reinforcement belt is fixedly connected to the connection component, and the other end extends in a direction away from the slope and is fixedly connected to the fill foundation on the outside of the slope.

[0007] The traditional soil nail anchor rod is combined with the main reinforcement belt of geosynthetics. By setting a connection component, the rigid structure of the anchor rod inside the original slope and the flexible force of the main reinforcement belt of the reinforced soil structure are transitioned, so that the single-point force of the anchor rod is transformed into the linear force distribution of the main reinforcement belt of the reinforced soil structure. At the same time, the reinforced soil retaining wall structure has a certain function of automatically adjusting deformation and coordinated force during operation, thus forming a stable composite retaining wall structure. The anchor rod and reinforced soil retaining wall connection structure of the utility model greatly shortens the layout of the main reinforcement belt by combining the main reinforcement belt with the anchor rod, and can also meet the theoretical technical requirements of the reinforced soil structure for the tensile strength and pull-out stability of the main reinforcement belt, thereby maintaining the technical advantages of the reinforced soil retaining wall under limited space working conditions and avoiding the disadvantage that the layout of the main reinforcement belt requires a large amount of excavation of the original soil.

[0008] Preferably, the connection assembly comprises a sleeve, a connection rod and a filling layer; the connection rod is arranged in the sleeve, the filling layer is arranged between the connection rod and the inner wall of the sleeve, and the outer wall of the sleeve abuts against the end of the U-shaped structure.

[0009] Preferably, the connecting rod is a connecting steel bar, and the filling layer is an expansive cement slurry. According to the stress characteristics of the reinforced earth retaining wall structure, connecting steel bars of different sizes and stiffness are used, and the expansive cement slurry is filled around the connecting steel bars to prevent corrosion of the steel bars, thereby improving the durability of the connecting assembly.

[0010] Preferably, the end of the main reinforcement belt of the reinforced soil is wrapped around the outer wall of the casing and folded back in a direction away from the slope.

[0011] Preferably, the folding length of the main reinforcement belt of the reinforced soil is greater than or equal to 2m.

[0012] Specifically, a plurality of the connection components are arranged at intervals along the height direction of the slope, and each connection component is connected to a plurality of anchor rods and main reinforcement belts along the length direction.

[0013] Specifically, the main reinforcement belt is a strip structure, a mesh structure or a grid structure.

[0014] Specifically, a wall unit is arranged outside the main reinforcement belt.

[0015] Preferably, the length of the anchor rod arranged on the outside of the slope is less than or equal to 15 cm.

[0016] Preferably, the anchor rod is a full-length bonded anchor rod, and the anchor rod is arranged obliquely.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The anchor rod and reinforced earth retaining wall connection structure of the utility model greatly shortens the layout of the main reinforcement belt by combining the main reinforcement belt with the anchor rod, and at the same time can meet the theoretical technical requirements of the reinforced earth structure for the tensile strength and pull-out stability of the main reinforcement belt, thereby maintaining the technical advantages of the reinforced earth retaining wall under limited space working conditions and avoiding the disadvantage that the layout of the main reinforcement belt requires a large amount of excavation of original earth.

[0019] 2. The anchor rod and reinforced earth retaining wall connection structure of the utility model can protect the steel bars from corrosion by filling expansive cement slurry around the connection steel bars, thereby improving the durability of the connection assembly.

[0020] 3. The anchor rod and reinforced earth retaining wall connection structure of the utility model has a simple structure, a short construction time, and good ecological and economic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the slope structure under the existing limited space engineering conditions;

[0022] Figure 2 For Figure 1 Schematic diagram of the structure of the reinforced earth retaining wall after excavation and backfilling of the slope;

[0023] Figure 3 For Figure 1 A schematic diagram of the connection structure of the anchor rod and the reinforced earth retaining wall of the utility model is arranged on a slope;

[0024] Figure 4 for Figure 3 Schematic diagram of the connection structure between the middle anchor rod and the main reinforcement belt;

[0025] Figure 5 for Figure 4 Schematic diagram of the elevation structure;

[0026] Figure 6 for Figure 4 A schematic cross-sectional structure diagram of ;

[0027] Figure 7 for Figure 6 Structural details of the connecting components;

[0028] Figure 8 for Figure 3 Structural details of .

[0029] In the figure:

[0030] 1-slope, 2-anchor, 21-U-shaped structure, 3-connection assembly, 31-casing, 32-connection rod, 33-filling layer, 4-main reinforcement belt, 5-wall unit. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0032] like Figure 3 and Figure 4 As shown, this embodiment provides a connection structure between an anchor rod and a reinforced earth retaining wall, including an anchor rod 2, a connection assembly 3 and a main reinforcement belt 4. The connection assembly 3 is arranged along the length direction of the slope 1. Figure 6 As shown, the anchor rod 2 is a full-length bonded anchor rod and is set obliquely. One end of the anchor rod 2 is anchored in the slope 1, and the other end is set on the outside of the slope 1. The outer end of the anchor rod 2 is bent inward to form a U-shaped structure 21, and the connecting component 3 is set in the U-shaped structure 21 and abuts against the end of the U-shaped structure 21. One end of the main reinforcement belt 4 is wrapped around the outer wall of the connecting component 3 and folded back in the direction away from the slope 1, and the other end extends in the direction away from the slope 1 and is fixedly connected to the fill foundation outside the slope 1. Figure 7 As shown, the connection assembly 3 includes a sleeve 31, a connecting rod 32 and a filling layer 33. The sleeve 31 is a PVC sleeve, the connecting rod 32 is a connecting steel bar, and the filling layer 33 is an expansive cement slurry. The connecting rod 32 is arranged in the sleeve 31, and the filling layer 33 is arranged between the connecting rod 32 and the inner wall of the sleeve 31. Figure 5 and Figure 8 As shown, a plurality of connection components 3 are arranged at intervals along the height direction of the slope 1 , and each connection component 3 is connected to a plurality of anchor rods 2 and main reinforcement belts 4 along the length direction, and a wall unit 5 is arranged outside the main reinforcement belts 4 .

[0033] The anchor rod and reinforced earth retaining wall connection structure provided in this embodiment has the following specific construction steps:

[0034] Step 1: Prepare relevant materials and equipment in advance, including the main reinforcement belt 4 of reinforced soil, the full-length bonded anchor rod 2 with hot-dip galvanized anti-corrosion treatment at the end, expansive cement slurry with expansion agent, drilling and grouting related machinery and equipment, PVC casing, connecting steel bars, grouting pipes, etc.

[0035] Step 2: On the original soil slope 1, a plurality of boreholes are constructed using appropriate drilling machinery and equipment according to certain spacing requirements;

[0036] Step 3: In the drilled hole, a soil nail anchor rod 2 whose exposed end is bent into a U-shaped structure 21 in advance is implanted, and grouting is performed. The cement slurry poured in the drilled hole is an expansive cement slurry containing an expansive agent, and the exposed length of the anchor rod 2 is ≤15 cm;

[0037] Step 4: Put the prepared PVC sleeve into the U-shaped structure 21 at the exposed end of the anchor rod 2, put the connecting steel bar into the PVC sleeve, and both are fixed in the U-shaped structure 21 of the anchor rod 2;

[0038] Step 5: injecting expansive cement slurry containing an expansive agent into the PVC casing to form a connection component 3 having certain strength, corrosion resistance and connection function;

[0039] Step 6: Pass the main reinforcement belt 4 through the connection component 3 and fold it back, and the folding length is greater than or equal to 2 meters;

[0040] Step 7: Use U-shaped nails to fix the main reinforcement belt 4 on the leveled fill foundation;

[0041] Step 8: Complete other processes of the reinforced soil structure of this layer, such as the wall unit 5 outside the fill foundation;

[0042] Step 9: Repeat the above steps 1 to 8 until the designed height and number of layers are reached to complete the reinforced soil structure.

[0043] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. A connection structure of an anchor rod and a reinforced earth retaining wall, comprising an anchor rod (2) and a main reinforcement belt (4); one end of the anchor rod (2) is anchored in a slope (1), and the other end is arranged outside the slope (1); characterized in that: It also includes a connection component (3), which is arranged along the length direction of the slope (1); The outer end of the anchor rod (2) is bent inward to form a U-shaped structure (21), and the connecting assembly (3) is arranged in the U-shaped structure (21) and abuts against the end of the U-shaped structure (21); One end of the main reinforcement belt (4) is fixedly connected to the connection assembly (3), and the other end extends in a direction away from the slope (1) and is fixedly connected to the fill foundation outside the slope (1).

2. The connection structure of anchor rod and reinforced earth retaining wall according to claim 1, characterized in that: The connection assembly (3) comprises a sleeve (31), a connection rod (32) and a filling layer (33); the connection rod (32) is arranged in the sleeve (31), the filling layer (33) is arranged between the connection rod (32) and the inner wall of the sleeve (31), and the outer wall of the sleeve (31) is in contact with the end of the U-shaped structure (21).

3. The connection structure of anchor rod and reinforced earth retaining wall according to claim 2, characterized in that: The connecting rod (32) is a connecting steel bar, and the filling layer (33) is expansive cement slurry.

4. The anchor rod and reinforced earth retaining wall connection structure according to claim 2, characterized in that: The end of the main reinforced soil belt (4) is wrapped around the outer wall of the casing (31) and folded back in a direction away from the slope (1).

5. The connection structure of anchor rod and reinforced earth retaining wall according to claim 4, characterized in that: The folded length of the reinforced soil main reinforcement belt (4) is greater than or equal to 2m.

6. The connection structure of anchor rod and reinforced earth retaining wall according to claim 1, characterized in that: A plurality of connection components (3) are arranged at intervals along the height direction of the slope (1), and each connection component (3) is connected to a plurality of anchor rods (2) and a main reinforcement belt (4) along the length direction.

7. The connection structure of anchor rod and reinforced earth retaining wall according to claim 6, characterized in that: The main reinforcement belt (4) is a strip-type structure, a mesh-type structure, or a grid-type structure.

8. The anchor rod and reinforced earth retaining wall connection structure according to claim 6, characterized in that: A wall unit (5) is arranged outside the main reinforcement belt (4).

9. The connection structure of anchor rod and reinforced earth retaining wall according to claim 1, characterized in that: The length of the anchor rod (2) arranged outside the slope (1) is less than or equal to 15 cm.

10. The connection structure of anchor rod and reinforced earth retaining wall according to claim 1, characterized in that: The anchor rod (2) is a full-length bonding anchor rod, and the anchor rod (2) is arranged obliquely.

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