Grouting retaining wall anchoring, grouting and spraying composite reinforcing structure and construction method

Abstract

The anchoring, grouting and spraying composite reinforcing structure comprises a soil filling area and a retaining wall arranged on the outer surface of the soil filling area, a soil filling reinforcing area connected with the retaining wall is poured in the soil filling area, a reinforcing layer is arranged on the retaining wall, and the soil filling reinforcing area and the reinforcing layer are located on the inner side and the outer side of the retaining wall respectively; a plurality of anchor rods used for improving the strength of the retaining wall are arranged in the retaining wall, the anchor rods are of hollow structures, cement paste is poured in the anchor rods, and the anchor rods penetrate through the retaining wall and extend into the filling reinforcement area; compared with the prior art, by arranging the soil filling reinforcing area between the soil filling area and the retaining wall and arranging the reinforcing layer on the retaining wall, deformation of the retaining wall is restrained, the stress condition of a retaining wall body is improved, the strength of the wall body is improved, meanwhile, the multiple hollow anchor rods are arranged in the retaining wall, and cement paste is poured into the anchor rods; the anchor rods play a reinforcing role in the retaining wall body, the structural strength in the retaining wall is improved, the service life of the retaining wall is prolonged, and then the retaining wall is reinforced and repaired.

Description

Technical Field

[0001] The invention relates to the technical field of retaining wall repair and reinforcement, and in particular to a mortar-laid retaining wall anchor-grouting composite reinforcement structure and a construction method. Background Art

[0002] The mortar-bonded retaining wall is built by grouting with stone sheets, blocks, rough stones, and rubble stones, using the grouting method or the squeezed grouting method to support the structure of roadbed fill and hillside soil to prevent the fill or soil from deforming and becoming unstable. Its advantages are simple construction technology and low cost. Most mortar-bonded retaining walls were built at the end of the last century. Due to internal factors such as the incomplete filling of grout during the construction of the retaining wall and the loose internal structure of the retaining wall, and the influence of external factors such as masonry weathering, water accumulation on the back of the wall, and vehicle loads, the mortar-bonded retaining wall is prone to cracking, dislocation, bulging, overturning, and voids.

[0003] To solve the above problems, a Chinese patent with application number 202411037691.2 discloses a grouting reinforcement and repair method for a mortar-laid rubble retaining wall. The above disclosed grouting reinforcement and repair method for a retaining wall first detects the internal structure of the retaining wall to determine the severity of damage to the retaining wall and the distribution of high-risk instability areas, and then formulates a grouting hole location layout plan; by constructing a frame beam on the outside of the retaining wall, the retaining wall can be reinforced first, and grouting holes for inclined small guide tubes and inclined steel flower pipes are reserved on the frame beam according to the grouting hole location layout plan, avoiding the need to drill holes on the frame beam in the later stage; the frame beam is set to provide stable conditions for small guide tube drilling and grouting, and then the small guide tube grouting provides stable conditions for inclined steel flower pipe drilling and grouting, and the inclined steel flower pipe grouting is used to form a stable reinforcement system for the inclined steel flower pipe anchoring frame beam. Chinese patent application number 202310330888.4 discloses a complete set of counterweight-type embankment retaining wall reinforcement structure and reinforcement method. The above-disclosed reinforcement structure mainly consists of three parts: a wall back rock and soil reinforcement structure, a wall body reinforcement and repair structure, and an external protective wall structure.

[0004] In the above-disclosed prior art, small tubes and steel tubes are driven into the wall and grouting is performed in the small tubes and steel tubes. This method can increase the stability of the wall. However, the small tubes and steel tubes can only increase the strength inside the wall, while the structural strength of the outside and surface of the wall cannot be reinforced, which can easily cause cracks and bulges on the wall surface, and easily lead to the risk of the wall falling off, thereby reducing the safety of the wall. Summary of the invention

[0005] The present invention aims to overcome the defects in the above-mentioned prior art and provide a mortar-laid retaining wall anchor grouting composite reinforcement structure and construction method that can improve the structural strength of the retaining wall, avoid the retaining wall from falling off due to cracks and other problems, and realize the repair and reinforcement of the retaining wall.

[0006] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical solutions: a mortar-laid retaining wall anchor-grouting composite reinforcement structure, comprising a fill area and a retaining wall arranged on the outer surface of the fill area, a fill reinforcement area connected to the retaining wall is cast in the fill area, a reinforcement layer is provided on the retaining wall, and the fill reinforcement area and the reinforcement layer are respectively located on the inner and outer sides of the retaining wall; a plurality of anchor rods for increasing the strength of the retaining wall are provided in the retaining wall, the anchor rods are hollow structures, cement slurry is cast in the anchor rods, and the anchor rods extend through the retaining wall to the fill reinforcement area.

[0007] As a preferred solution of the present invention, the reinforcement layer includes a steel mesh layer arranged on the surface of the retaining wall and a concrete protective layer cast on the steel mesh layer.

[0008] As a preferred solution of the present invention, a prism is provided on the top of the reinforcement layer to facilitate observation of the retaining wall.

[0009] As a preferred solution of the present invention, a plurality of anchor rods are arranged in a plum blossom shape along the surface of the retaining wall.

[0010] As a preferred solution of the present invention, the length of the anchor rod is greater than the thickness of the retaining wall.

[0011] As a preferred solution of the present invention, the anchor rod is arranged to be inclined upward from the inside to the outside, and an anchor head is provided at the outer end of the anchor rod.

[0012] As a preferred solution of the present invention, a plurality of drainage channels are provided in the retaining wall, and the drainage channels extend outward through the reinforcement layer.

[0013] As a preferred solution of the present invention, a plurality of drainage channels are arranged to be inclined downward.

[0014] As a preferred solution of the present invention, the end of the drainage channel is located at the connection between the retaining wall and the fill reinforcement area.

[0015] A construction method for a mortar-laid retaining wall anchor-grouting composite reinforcement structure comprises the following steps: S1: Check the internal technical condition of the retaining wall and clean the vegetation, loose soil, loose stones, etc. on the wall; S2: Lofting to determine the anchor hole position; S3: Clear the drainage channel of the retaining wall and extend it with PVC pipe; S4: Laying out the steel mesh layer; S5: After reserving anchor holes, pouring a concrete protective layer on the retaining wall surface; S6: Anchor rods are laid, and the length of the anchor rods is greater than the thickness of the retaining wall; S7: Inject cement slurry from the end of the anchor rod to anchor and seal the anchor.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting a fill reinforcement area between the fill area and the retaining wall and setting a reinforcement layer on the retaining wall, the deformation of the retaining wall is restricted, the stress condition of the retaining wall is improved, and the strength of the wall is increased. At the same time, a number of hollow anchor rods are set in the retaining wall, and cement slurry is poured in the anchor rods. The anchor rods play a reinforcement role in the retaining wall body, which increases the structural strength of the retaining wall and the service life of the retaining wall, thereby realizing the reinforcement and repair of the retaining wall; 2. Furthermore, by providing a reinforcement layer including a concrete protective layer and a steel mesh layer, and the steel mesh layer being arranged in the concrete protective layer, the structural strength of the entire reinforcement layer is improved, thereby increasing the reinforcement effect of the retaining wall. In addition, a prism is arranged on the top of the reinforcement layer for detecting the retaining wall, thereby ensuring monitoring of the status of the retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the present invention Figure numerals: retaining wall 1, reinforcement layer 2, concrete protective layer 201, steel mesh layer 202, drainage channel 3, anchor rod 4, anchor head 401, cement slurry 402, prism 5, fill reinforcement area 6, fill area 7, ground line 8. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] like Figure 1-Figure 2 As shown, a mortar-laid retaining wall anchor-grouting composite reinforcement structure comprises a fill area 7 and a retaining wall 1 arranged on the outer surface of the fill area 7, characterized in that a fill reinforcement area 6 connected to the retaining wall 1 is cast in the fill area 7, a reinforcement layer 2 is provided on the retaining wall 1, and the fill reinforcement area 6 and the reinforcement layer 2 are respectively located on the inner and outer sides of the retaining wall 1; a plurality of anchor rods 4 for increasing the strength of the retaining wall 1 are provided in the retaining wall 1, the anchor rods 4 are hollow structures, cement slurry 402 is cast in the anchor rods 4, and the anchor rods 4 extend through the retaining wall 1 to the fill reinforcement area 6.

[0020] Furthermore, a fill reinforcement area 6 is provided between the retaining wall 1 and the fill area 7, and a reinforcement layer 2 is provided on the retaining wall 1. Under the action of the reinforcement layer 2 and the fill reinforcement area 6, the deformation of the retaining wall 1 is constrained, thereby reducing the deformation degree of the retaining wall 1, improving the stress conditions of the wall, and thereby improving the strength of the wall body.

[0021] Specifically, the loose soil on the surface of the filling area 7 is formed into a stone body with a certain strength after grouting, and the stone body forms the filling reinforcement area 6.

[0022] In addition, a plurality of anchor rods 4 are arranged in the retaining wall 1, and the plurality of anchor rods 4 are arranged along the thickness direction of the retaining wall 1, and the plurality of anchor rods 4 are hollow structures, and cement slurry 402 is poured in the hollow structure. At the same time, the anchor rods 4 penetrate into the retaining wall 1 and extend into the fill reinforcement area 6, so the cement slurry 402 in the anchor rods 4 also extends into the fill reinforcement area 6, and after the cement slurry 402 solidifies, it is tightly connected with the concrete of the fill reinforcement area 6 to form an integrated structure.

[0023] The reinforcement layer 2 includes a steel mesh layer 202 arranged on the surface of the retaining wall 1 and a concrete protective layer 201 cast on the steel mesh layer 202. Further, the concrete protective layer 201 is cast on the surface of the retaining wall 1. However, before casting the concrete protective layer 201, the prefabricated steel mesh layer 202 is first laid on the surface of the retaining wall 1, and then concrete is cast on the steel mesh layer 202. After the cast concrete solidifies, the concrete protective layer 201 is formed. In addition, the top of the solidified concrete protective layer 201 is flush with the top of the retaining wall 1. The bottom end of the protective layer 201 extends to the ground line 8; the surface of the retaining wall 1 is reinforced by the setting of the concrete protective layer 201, and at the same time, the retaining wall 1 is constrained under the action of the concrete protective layer 201 and the fill reinforcement area 6, thereby reducing the deformation degree of the retaining wall 1, improving the structural quality of the retaining wall 1, and increasing the life of the retaining wall 1. In addition, by setting the steel mesh layer 202 in the concrete protective layer 201, the structural strength of the concrete protective layer 201 is strengthened, thereby improving the reinforcement effect of the concrete protective layer 201 on the surface of the retaining wall 1.

[0024] A prism 5 is provided at the top of the reinforcement layer 2 for facilitating observation of the retaining wall 1. Furthermore, the prism 5 is arranged at the top of the concrete protective layer 201. The observation of the retaining wall 1 is achieved through the cooperation of the prism 5 and the total station, thereby ensuring real-time monitoring of the status of the retaining wall 1 and improving the quality monitoring of the retaining wall 1 after reinforcement.

[0025] A plurality of anchor rods 4 are arranged in a plum blossom shape along the wall surface of the retaining wall 1. Furthermore, a plurality of anchor rods 4 are distributed in a plum blossom shape on the wall surface of the retaining wall 1. Specifically, the installation of the anchor rods 4 needs to be carried out after the concrete protective layer 201 is poured and solidified. Therefore, when pouring the concrete protective layer 201, anchor holes for inserting the anchor rods 4 need to be left in advance. The plurality of anchor rods 4 are arranged along the thickness direction of the retaining wall 1, and the plurality of anchor rods 4 pass through the concrete protective layer 201 into the retaining wall 1, and the end of the anchor rod 4 is flush with the end face of the concrete protective layer 201.

[0026] In addition, the length of the anchor rod 4 is greater than the thickness of the retaining wall 1. Furthermore, the length of the anchor rod 4 is greater than the thickness of the retaining wall 1 plus the thickness of the concrete protective layer 201. When the anchor rod 4 is inserted into the retaining wall 1, the end of the anchor rod 4 must penetrate into the fill protection area 6. Therefore, the anchor rod 4 adopts a hollow self-advancing anchor rod.

[0027] Specifically, the self-feeding anchor is an anchoring technology based on the properties of concrete itself. The main principle is to gradually enter each section of the anchor barrel while drilling a hole in the cave wall, forming a certain length of steel bars in the pre-buried sleeve; when the concrete hardens, the steel bars and concrete form an integrated structure, thereby achieving a solid support effect. The self-feeding anchor is mainly composed of steel bars, self-feeding barrels, wear-resistant plugs, etc. Among them, the steel bars are the main part that bears the support function, and the self-feeding barrels and wear-resistant plugs are auxiliary components that play a fixing and protective role. In addition, it is also said that the structure of the self-feeding anchor includes a hollow steel pipe, an anchor terminal and a spiral drill bit. During the drilling process, the drill rod and the drill bit rotate at the same time, and a grouting pipe can be installed inside the drill rod. The self-propelled anchor rod integrates multiple functions such as drilling, grouting, and anchoring into one, which simplifies the construction steps; the self-propelled anchor rod can provide reliable anchoring effect in complex strata such as broken rock strata, loose soil strata, and strata that require casing wall drilling; at the same time, the self-propelled anchor rod is easy to operate, which can reduce the labor intensity of workers and improve work efficiency. The self-propelled anchor rod has the advantages of stable support, safety and reliability, and can effectively prevent the occurrence of accidents such as stratum collapse and fault slip. Therefore, the self-propelled anchor rod is used in this embodiment.

[0028] In addition, the anchor rod 4 is inclined upward from the inside to the outside, and an anchor head 401 is provided at the outer end of the anchor rod 4. Furthermore, the anchor rod 4 is in an inclined state when inserted into the retaining wall 1. Specifically, the anchor rod 4 is inclined downward along the thickness direction of the retaining wall 1, that is, the height of one end of the anchor rod 4 located in the concrete protective layer 201 is higher than the height of the tail end of the anchor rod 4 in the retaining wall 1. When pouring cement slurry 402 into the hollow structure of the anchor rod 4, the inclined anchor rod 4 allows the cement slurry 402 to flow to the tail end of the anchor rod 4 under the action of gravity, thereby facilitating the cement slurry 402 to fill the anchor rod 4, thereby improving the pouring efficiency of the cement slurry 402, and also avoiding the blockage of the cement slurry 402, thereby ensuring the pouring effect of the cement slurry 402.

[0029] A plurality of drainage channels 3 are provided in the retaining wall 1, and the drainage channels 3 extend outward through the reinforcement layer 2. Furthermore, the plurality of drainage channels 3 are evenly distributed in the retaining wall 1, and the plurality of drainage channels 3 are arranged along the thickness direction of the retaining wall 1. At the same time, when the concrete protective layer 201 of the reinforcement layer 2 is poured, drainage holes connected to the drainage channels 3 in the retaining wall 1 are left in advance, so that the drainage channels 3 can extend through the reinforcement layer 2 to the outside of the reinforcement layer 2, thereby ensuring that the accumulated water in the retaining wall 1 can be drained out smoothly.

[0030] A plurality of drainage channels 3 are arranged to be tilted downward. Furthermore, the drainage channels 3 are arranged to be tilted downward so that the accumulated water can be discharged to the outside under the action of gravity, thereby improving the efficiency of draining the accumulated water and ensuring that the accumulated water in the retaining wall 1 will not remain.

[0031] The end of the drainage channel 3 is located at the connection between the retaining wall 1 and the fill reinforcement area 6. Furthermore, by setting the end of the drainage channel 3 at the connection between the retaining wall 1 and the fill reinforcement area 6, it is ensured that the accumulated water in the entire retaining wall 1 can be discharged through the drainage channel 3, ensuring that the accumulated water will not remain in the retaining wall 1, thereby improving the effect of draining the accumulated water in the retaining wall 1.

[0032] A construction method for a mortar-laid retaining wall anchor-grouting composite reinforcement structure comprises the following steps: S1: Check the internal technical condition of the retaining wall 1, clean the vegetation, loose soil, loose stones, etc. on the wall, so as to ensure that the surface of the retaining wall 1 is clean and tidy, and then facilitate the subsequent pouring of the concrete protective layer 201; S2: Lofting and determining anchor hole positions, where a number of anchor hole positions are distributed on the wall surface of the retaining wall 1 in a plum blossom structure; S3: Clear the drainage channel 3 of the retaining wall 1 and extend it with a PVC pipe; S4: Laying out the steel mesh layer 202, and fixing the steel mesh layer 202 on the wall surface of the retaining wall 1 to ensure that the steel mesh layer 202 does not move during subsequent concrete pouring; S5: After reserving 4 anchor bolt holes, pour a concrete protective layer 201 on the surface of the retaining wall 1; S6: laying anchor rods 4, wherein the length of the anchor rods 4 is greater than the thickness of the retaining wall 1, and the anchor rods 4 pass through the concrete protective layer 201 and the retaining wall 1 and penetrate into the fill protection area 6; S7: Inject cement slurry 402 from the end of the anchor rod 4 to anchor and seal the anchor.

[0033] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0034] Although the following terms are used more frequently in this paper: retaining wall 1, reinforcement layer 2, concrete protective layer 201, steel mesh layer 202, drainage channel 3, anchor rod 4, anchor head 401, cement slurry 402, prism 5, fill reinforcement area 6, fill area 7, ground line 8, etc., the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A mortar-laid retaining wall anchor-grouting composite reinforcement structure, comprising a fill area (7) and a retaining wall (1) arranged on the outer surface of the fill area (7), characterized in that: A fill reinforcement area (6) connected to the retaining wall (1) is cast in the fill area (7); a reinforcement layer (2) is provided on the retaining wall (1); the fill reinforcement area (6) and the reinforcement layer (2) are respectively located on the inner and outer sides of the retaining wall (1); a plurality of anchor rods (4) for increasing the strength of the retaining wall (1) are provided in the retaining wall (1); the anchor rods (4) are hollow structures; cement slurry (402) is cast in the anchor rods (4); and the anchor rods (4) pass through the retaining wall (1) and extend into the fill reinforcement area (6).

2. A mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 1, characterized in that: The reinforcement layer (2) comprises a steel mesh layer (202) arranged on the surface of the retaining wall (1) and a concrete protective layer (201) cast on the steel mesh layer (202).

3. A mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 2, characterized in that: A prism (5) is provided at the top of the reinforcement layer (2) for facilitating observation of the retaining wall (1).

4. The mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 1 is characterized in that: A plurality of anchor rods (4) are arranged in a plum blossom shape along the surface of the retaining wall (1).

5. The mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 1 is characterized in that: The length of the anchor rod (4) is greater than the thickness of the retaining wall (1).

6. The mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 1 is characterized in that: The anchor rod (4) is arranged to be inclined upward from the inside to the outside, and an anchor head (401) is provided at the outer end of the anchor rod (4).

7. The mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 1 is characterized in that: A plurality of drainage channels (3) are provided in the retaining wall (1), and the drainage channels (3) extend outward through the reinforcement layer (2).

8. The mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 7 is characterized in that: The plurality of drainage channels (3) are arranged to be inclined downward.

9. The mortar-laid retaining wall anchor-spraying composite reinforcement structure according to claim 7 is characterized in that: The end of the drainage channel (3) is located at the connection between the retaining wall (1) and the fill reinforcement area (6).

10. A construction method for a mortar-laid retaining wall anchor-grouting composite reinforcement structure, characterized in that: The method is applicable to the mortar-laid retaining wall anchor spraying composite reinforcement structure as claimed in any one of claims 1 to 9, comprising the following steps: S1: Check the internal technical condition of the retaining wall (1) and clean the wall surface of vegetation, loose soil, loose stones, etc. S2: Lofting to determine the anchor hole position; S3: Clear the drainage channel (3) of the retaining wall (1) and extend it with a PVC pipe; S4: Laying out a steel mesh layer (202); S5: After reserving the hole position of the anchor rod (4), pouring a concrete protective layer (201) on the surface of the retaining wall (1); S6: laying anchor rods (4), wherein the length of the anchor rods (4) is greater than the thickness of the retaining wall (1); S7: Inject cement slurry (402) from the end of the anchor rod (4) to anchor and seal the anchor.

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