KR20190096751A - Methods for top-down constructing panel type retaining wall structure - Google Patents

Abstract

Disclosed is a top-down panel type retaining wall construction method. The method includes: a step (a) of cutting a position in which a first retaining wall block is expected to be installed; a step (b) of installing a first foundation block having a fixed width on a floor adjacent to the cut slope; a step (c) of placing the first retaining wall block on the first foundation block obliquely in a direction to the cut slope; a step (d) of fixing the first retaining wall block to the ground of the cut slope; a step (e) of cutting a position, in which a second retaining wall block is expected to be installed, by excavating a width outer floor surface of the first foundation block; a step (f) of installing a second foundation block having a fixed width on a floor adjacent to the cut slope; a step (g) of placing the second retaining wall block on the second foundation block obliquely in a direction to the cut slope; a step (h) of fixing the second retaining wall block to the ground of the cut slope; a step (i) of cutting a position, in which a third retaining wall block is expected to be installed, by excavating a width outer floor surface of the second foundation block; and a step (j) of constructing n-number of retaining wall blocks as stairs by repeating processes, which are practically the same as the steps from (f) to (i), on the third to n-number of retaining wall blocks. Therefore, the method is capable of increasing working efficiency by preventing interference between excavating machines.

Description

Method for top-down constructing panel type retaining wall structure}

The present invention relates to a panel retaining wall construction method, and more particularly to a panel retaining wall construction method for reinforcing the ground by installing a precast panel on the slope.

In general, the retaining wall is a structure that supports the soil so that it does not collapse by resisting earth pressure. Recently, the retaining wall is made by stacking a large number of laminated members such as blocks.The retaining wall can minimize the incision of the slope compared to the reinforced concrete retaining wall, can produce a beautiful front wall, and is easier and easier to manufacture than the reinforced concrete retaining wall. It is widely used because it has the advantage of easy transportation to the site.

Among several retaining wall methods using a laminated member, there is a pressurized grouting method using a reinforcing material. This method is a method of reinforcing the ground by fixing the reinforcement on the ground and then connecting the reinforcement by installing a precast panel (hereinafter referred to as a 'retaining wall block') perpendicular to the ground on the earthwork surface. Here, as the reinforcing material, various kinds such as steel pipes, deformed reinforcing bars, and anchors may be employed.

In the case of shearing slopes or natural slopes, a slope retaining wall method for reinforcing the ground by installing retaining wall blocks on the slope is required. The retaining wall block used in the slope reinforcing retaining wall method is generally disposed on the slope by a construction inclined backward while being mounted on a predetermined base member. In addition, the step of retaining wall construction is achieved by repeatedly connecting the other retaining wall block on the top of any one retaining wall block chain.

The pressure grouting process forms a reinforcement structure substantially integrated with the ground by applying pressure grouting through the reinforcement to inject the reinforcement grout material and fix the reinforcement member.

In the gap between the back surface of the precast panel and the slope of the ground, earth or back filling grout or concrete is used to back fill the construction. As a result, the backfill surface is filled with the backfill material.

As described above, the conventional slope-reinforced retaining wall structure is assembled by lifting the retaining wall block with a crane, etc., and stacking the chain in a stacked manner. Usually, the retaining wall block is formed by concrete and has a huge weight, so that the stacking work is not easy. The disadvantage is that it takes a long time.

In addition, there is a vulnerability that can cause a safety accident due to slip occurs in the contact surface between the adjacent precast panels in the stacking process is required to improve this.

The present invention was conceived in view of the above problems, and the object of the present invention is to provide a top-down panel retaining wall construction method capable of constructing a step retaining wall structure while digging a point where the retaining wall block is to be installed. have.

It is another object of the present invention to provide a panel retaining wall construction method capable of top-down, which can improve work efficiency by preventing interference between pre-installed retaining wall blocks and excavation equipment during cutting work for a point where the retaining wall blocks are to be installed. .

Still another object of the present invention is to provide a top-down panel retaining wall construction method having a mounting structure capable of distributing load for each retaining wall block.

In order to achieve the above object, the present invention comprises the steps of (a) cutting the point where the first retaining wall block is to be installed; (b) installing a first foundation block having a predetermined width at a floor adjacent to the cut slope; (c) arranging a first retaining wall block at an angle to said cut slope obliquely over said first foundation block; (d) fixing the first retaining wall block to the ground of the cut slope; (e) cutting the point where the second retaining wall block is to be installed by excavating the outer bottom surface of the first foundation block; (f) installing a second foundation block having a predetermined width at a floor adjacent to the cut slope; (g) arranging a second retaining wall block at an angle to said cut slope obliquely over said second foundation block; (h) securing the second retaining wall block to the ground of the cut slope; (i) cutting an outer bottom surface of the second foundation block to cut a point where a third retaining wall block is to be installed; (j) including a series of steps for constructing the n retaining wall blocks stepwise by repeating the steps substantially the same as the above steps (f) to (i) for the third retaining wall block to the nth retaining wall block. It provides a top-down panel retaining wall construction method characterized in that.

The first retaining wall block to the n-th retaining wall block have a first taper portion inclined from the front surface of the retaining wall block to the rear surface at a front surface adjacent to a lower end thereof, and when cutting the point where the second to n-th retaining wall blocks are to be installed. It is preferable to ensure the ease of excavation by carrying out cutting using the inclined surface of the 1 taper part.

The method may further include installing a finishing block on the inclined surface of the first taper part after the excavation and retaining wall block fixing is completed.

On the rear surface adjacent to the upper end of the first retaining wall block to the n-th retaining wall block, a second taper portion inclined toward the front surface from the rear surface of the retaining wall block is formed, and between the second tapered portion of the first retaining wall block and the cut slope The process may further include installing a finishing block.

After forming the slope by cutting the point where the retaining wall block is to be installed, reinforcing the ground by inserting a reinforcement into the ground of the cut slope before placing the retaining wall block on the cut slope, and the exposed portion of the reinforcement is formed on the retaining wall block. It is preferable to insert the retaining wall block on the cut slope by inserting it into the hole.

After each retaining wall block is disposed on the cut slope, the process may further include filling the space between the retaining wall block and the cut slope with earth and / or backfill.

Panel-type retaining wall construction method capable of top-down according to the present invention has the following effects.

First, since the process proceeds in a top-down manner to construct a stepped retaining wall structure while digging the point where the retaining wall block is to be installed, it is convenient to work and ensure stability during construction.

Second, since the excavation is made to the point where the next retaining wall block will be installed by securing a working space using a taper portion located at the bottom of the retaining wall block, the work efficiency can be improved by preventing interference between the retaining wall block and the excavating equipment.

Third, each retaining wall block is supported by a mounting block placed on a horizontal bottom surface, thereby effectively distributing the load.

Fourth, the retaining wall structure is gently constructed in a staircase shape, which makes the exterior beautiful and visually stable and has an excellent view.

Fifth, it is possible to form the filling material injection hole of the upper and lower narrow shape using the taper portion located on the top of the retaining wall block can improve the workability of the back filling process.

Sixth, since the foundation block and the finishing block are interposed between the vertically adjacent retaining wall blocks, slip does not occur between the retaining wall blocks and the assembly structure of the retaining wall can be stably maintained.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
1 is a flowchart illustrating a process of performing a top-down panel retaining wall construction method according to a preferred embodiment of the present invention.
2 is a cross-sectional view showing a configuration in which the first retaining wall block is cut and the first grout steel pipe is inserted.
3 is a cross-sectional view illustrating a configuration in which the first retaining wall block is provided in FIG. 2.
FIG. 4 is a cross-sectional view illustrating a structure in which the second retaining wall block is cut in FIG. 3.
5 is a cross-sectional view illustrating a configuration in which a second grout steel pipe is inserted in FIG. 4.
FIG. 6 is a cross-sectional view illustrating a structure in which a second retaining wall block is provided in FIG. 5.
7 is a cross-sectional view showing a configuration in which the finishing block is installed in FIG.
8 is a cross-sectional view showing a construction example in which the first to fourth retaining wall blocks are provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a flowchart illustrating a process of performing a top-down panel retaining wall construction method according to a preferred embodiment of the present invention, Figures 2 to 8 are cross-sectional views sequentially showing the installation process of the cut and retaining wall block. .

1 to 8, a top-down panel retaining wall construction method according to a preferred embodiment of the present invention includes a first cutting process for forming a first cut slope 2a and a first retaining wall block 30. Mounting process, the 2nd cutting process of forming the 2nd cut slope 2b with a step below the 1st cut slope 2a, and the mounting process of the 2nd retaining wall block 31, and the 2nd cut slope 2b And a third cutting process for forming a third cut slope 2c having a step below, and a mounting process for the third retaining wall block 32. In addition, the construction of the top-down method of excavating downward and mounting the retaining wall blocks on the respective cut slopes is repeatedly performed for the fourth to n-th retaining wall blocks.

First, as shown in FIG. 1 and FIG. 2, a first cutting process of forming a first cut slope 2a at the start point of installing the retaining wall is performed (step S100). The inclination angle of the first cut slope 2a substantially coincides with the placement angle of the first retaining wall block 30 to be inclined obliquely thereon.

In the insertion process of the first grout steel pipe 10, the first grout steel pipe 10 is inserted as a reinforcing material for reinforcing the ground after forming a drilling hole in the ground 1 of the first cut slope 2a. (Step S101). An end portion of the first grout steel pipe 10 is exposed to the outside of the first cut slope 2a by a length determined to penetrate the first retaining wall block 30. In the present invention, the reinforcing material is not limited to a grout steel pipe, and various kinds of reinforcing bars or anchors may be employed. Hereinafter, the configuration of the present invention will be described based on the embodiment of reinforcing the ground using a grout steel pipe.

Next, the length (horizontal dimension viewed from the front of the foundation block) and the width (vertical dimension viewed from the front of the foundation block) and the height of the horizontal bottom surface 3a adjacent to the cut first cut surface 2a A first foundation block 20 having a structure is installed (step S102). The first foundation block 20 is disposed so as to contact a point where the first cut surface 2a and the horizontal bottom surface 3a meet or at a predetermined distance from the point. It is preferable that the first foundation block 20 is firmly fixed to the ground by a predetermined pin.

As shown in FIG. 3, the first retaining wall block 30 is mounted on the first foundation block 20 so as to be inclined obliquely in the direction of the first cut slope 2a cut (step S103). Although the first retaining wall block 30 is made of a precast panel, it is preferable that the first taper portion A is formed on the front surface adjacent to the lower end to ensure ease of excavation during the subsequent cutting process. The first taper portion A is formed to have a surface gradually inclined backward from the front surface of the first retaining wall block 30 while gradually decreasing in thickness while going toward the lower end of the first retaining wall block 30.

After the arrangement of the first retaining wall block 30 is completed, the grout material is injected into the first grout steel pipe 10 exposed to the outside of the first retaining wall block 30 to cut the first retaining wall block 30 first. It is firmly fixed to the ground 1 of the slope 2a (step S104). The fixing process of the first grout steel pipe 10 through the injection of grout material may be performed before mounting the first retaining wall block 30.

After step S104, a back filling grout or concrete is injected into the gap between the rear surface of the first retaining wall block 30 and the first cut slope 2a to form the first back filling portion 40 (step S105). Alternatively, a process of injecting soil, gravel or the like into the gap between the rear surface of the first retaining wall block 30 and the first cut surface 2a may be performed.

The second taper portion B is formed on the rear surface adjacent to the upper end of the first retaining wall block 30 to ensure the ease of the backfilling process. The second taper portion B is formed such that the thickness of the retaining wall gradually decreases in the upper direction of the first retaining wall block 30, but has an obliquely inclined surface on the rear surface of the first retaining wall block 30. By the second taper B, a back filling injection hole having a substantially upper and lower narrowing shape may be formed between the rear surface adjacent to the upper end of the first retaining wall block 30 and the first cut surface 2a.

After completing the backfilling process by injecting the backfilling material through the backfilling inlet, the finishing work is completed by inserting the first finishing block 50 between the second taper portion B and the first cut surface 2a. (Step S106).

As shown in FIG. 4, the second cut is performed at the point where the second retaining wall block 31 is to be installed by carrying out excavation work downward from the widthwise outer bottom surface (see 3a of FIG. 3) of the first foundation block 20. A second cut process for forming the slope 2b is performed (step S107). Accordingly, the second cut slope 2b is formed in a stepped structure spaced apart from the first cut slope 2a by at least the longitudinal width (d of FIG. 4) of the first foundation block 20. The inclination angle of the second cut slope 2b substantially coincides with the placement angle of the second retaining wall block 31 to be inclined obliquely thereon. The structure in which different cut slopes adjacent to each other in the vertical direction are spaced apart by at least d in the horizontal direction enables top-down retaining wall construction, and the surface of the retaining wall structure becomes stepped to provide visual stability and a beautiful view. do.

Subsequently, as shown in FIG. 5, after the insertion process of the second grout steel pipe 11 is performed, a perforation hole is formed in the ground 1 of the cut second cut slope 2b, and then the second grout steel pipe 11 is formed. Is inserted (step S108). An end portion of the second grout steel pipe 11 is exposed to the outside of the second cut slope 2b by a length determined to penetrate the first retaining wall block 30.

The second foundation block 21 is installed on the horizontal bottom 3b adjacent to the cut second cut slope 2b (step S109). The second foundation block 21 is disposed so as to contact a point where the second cut slope 2b and the horizontal bottom surface 3b meet or at a predetermined distance from the point. It is preferable that the second foundation block 21 is firmly fixed to the ground by a predetermined pin.

As shown in FIG. 6, the second retaining wall block 31 is mounted on the second foundation block 21 so as to be inclined obliquely in the direction of the second cut slope 2b cut (step S110). The second retaining wall block 31 is made of a precast panel in the same manner as the first retaining wall block 30, but the first tapered portion A is formed on the front surface adjacent to the lower end to ensure easy excavation during the cutting process. desirable. The first taper portion A is formed such that the thickness of the retaining wall gradually decreases in the direction toward the lower end of the second retaining wall block 31, but has an inclined surface obliquely rearward from the front surface of the second retaining wall block 31.

After the arrangement of the second retaining wall block 31 is completed, the grout material is injected into the second grout steel pipe 11 exposed to the outside of the second retaining wall block 31 to cut the second retaining wall block 31 into the second cut. It is firmly fixed to the ground 1 of the slope 2b (step S111). The fixing process of the second grout steel pipe 11 through the injection of grout material may be performed before mounting the second retaining wall block 31.

A back filling grout or concrete is injected into the gap between the back surface of the second retaining wall block 31 and the second cut slope 2b to form a second back filling portion 41 (step S112). Alternatively, a process of injecting soil, gravel, or the like into the gap between the rear surface of the second retaining wall block 31 and the second cut slope 2b may be performed.

A second taper portion B is formed on the back surface adjacent to the upper end of the second retaining wall block 31 to ensure the ease of the backfilling process. The second taper portion B is formed such that the thickness of the retaining wall gradually decreases in the direction toward the upper end of the second retaining wall block 31, but has an obliquely inclined surface on the rear surface of the second retaining wall block 31. By the second taper portion B, a backfilling inlet having a substantially upper and lower narrow shape may be formed between the rear surface of the second retaining wall block 31 and the first foundation block 20. The back filling process is preferably performed until the back filling inlet is completely filled with a back filling material. In this case, the first taper portion A of the first retaining wall block 30 positioned above the second taper may also serve as a guide for inducing a backfill material into the backfill inlet.

After forming the second backfill portion, as shown in FIG. 7, the second finishing block is fitted between the first tapered portion A of the first retaining wall block 30 and the top surface of the second retaining wall block 31. Install 60 to finish the work (step S113).

Subsequently, for the third retaining wall block 32 to the n-th retaining wall block, a series of steps substantially the same as those of the previous cutting and mounting steps are performed downward, and the n retaining wall blocks are stepped.

In FIG. 8, the first retaining wall block 30, the second retaining wall block 31, the third retaining wall block 32, and the fourth retaining wall are repeatedly formed by repeatedly cutting and mounting processes from the upper surface to the lower surface of the ground 1. A retaining wall structure is shown in which block 33 is constructed stepwise. In such a retaining wall structure, the first to fourth foundation blocks 20, 21, 22, and 23 are disposed in a one-to-one correspondence below the first to fourth retaining wall blocks 30, 31, 32, and 33. The fourth retaining wall blocks 30, 31, 32, and 33 have a stepped shape in which the adjacent blocks are spaced apart from each other in the horizontal direction by the vertical width d of the first to fourth foundation blocks 20, 21, 22, and 23. It is constructed.

In addition, the retaining wall structure has a first to fourth backfill filled between the rear surfaces of the first to fourth retaining wall blocks 30, 31, 32, and 33 and the first to fourth cut slopes 2a, 2b, 2c, and 2d. The parts 40, 41, 42, and 43 are provided.

As described above, the top-down panel retaining wall construction method according to the present invention implements a top-down process of cutting and mounting processes for installing the retaining wall block from the top of the ground 1 to the bottom, while proceeding stepwise. Stability can be secured visually and structurally, and the load can be distributed for each retaining wall block.

In addition, the work space is secured by using the first tapered portion A formed at the bottom of the retaining wall block, which is installed at the bottom of the retaining wall block, so that excavation is performed at the point where the next retaining wall block is to be installed. There is an advantage that can easily inject the back-filling material by using the inlet of the upper and lower narrow shape formed by the second tapered portion (B) formed on the top.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

A: 1st taper part B: 2nd taper part
1: Soil 2a: First Cut Slope
2b: second cut slope 2c: third cut slope
2d: fourth cut slope 3a, 3b: bottom surface
10: first grout steel pipe 11: second grout steel pipe
12: third grout steel pipe 13: fourth grout steel pipe
20: first basic block 21: second basic block
22: third basic block 23: fourth basic block
30: first retaining wall block 31: second retaining wall block
32: third retaining wall block 33: fourth retaining wall block
40: first filling portion 41: second filling portion
42: third filler 43: fourth filler
50: first finishing block 60, 61, 62: second finishing block

Claims (6)

(a) cutting the point where the first retaining wall block is to be installed;
(b) installing a first foundation block having a predetermined width at a floor adjacent to the cut slope;
(c) arranging a first retaining wall block at an angle to said cut slope obliquely over said first foundation block;
(d) fixing the first retaining wall block to the ground of the cut slope;
(e) cutting the point at which the second retaining wall block is to be installed by excavating a widthwise outer bottom surface of the first foundation block;
(f) installing a second foundation block having a predetermined width at a floor adjacent to the cut slope;
(g) arranging a second retaining wall block at an angle to said cut slope obliquely over said second foundation block;
(h) securing the second retaining wall block to the ground of the cut slope;
(i) cutting the point where the third retaining wall block is to be installed by excavating a widthwise outer bottom surface of the second foundation block; And
(j) including a series of steps for constructing the n retaining wall blocks stepwise by repeating the steps substantially the same as the above steps (f) to (i) for the third retaining wall block to the nth retaining wall block. Panel-type retaining wall construction method capable of top-down, characterized in that. The method of claim 1,
The first retaining wall block to the n-th retaining wall block have a first tapered portion inclined from the front surface of the retaining wall block to the rear surface at a front surface adjacent to a lower end thereof,
When cutting the point where the second to n-th retaining wall block is to be installed, the top-down panel retaining wall construction method, characterized in that the ease of excavation by securing the cutting using the inclined surface of the first tapered portion. The method of claim 2,
And a step of installing the finishing block on the inclined surface of the first tapered part after the excavation and retaining wall block fixing is completed. The method of claim 3,
On the rear surface adjacent to the upper end of the first retaining wall block to the n-th retaining wall block, a second taper portion inclined toward the front surface from the rear surface of the retaining wall block is formed,
And a step of installing a finishing block between the second tapered portion of the first retaining wall block and the cut slopes. The method of claim 1,
After forming the slope by cutting the point where the retaining wall block is to be installed, reinforcing the ground by inserting a reinforcement into the ground of the cut slope before placing the retaining wall block on the cut slope, and the exposed portion of the reinforcement is formed on the retaining wall block. A panel-type retaining wall construction method capable of top-down, wherein the retaining wall block is inserted into a hole and disposed on the cut slope. The method of claim 1,
And placing each retaining wall block on the cut slope, and then filling the space between the retaining wall block and the cut slope with earth and / or backfill to further backfill the panel retaining wall. Construction method.

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