KR101233095B1 - Impoved retaining wall structure and construction method thereof - Google Patents

Abstract

PURPOSE: An advanced retaining wall structure and a construction method thereof are provided to easily secure the quality and to reduce the construction period and construction costs by the unitification of each layer formed by a geogrid. CONSTITUTION: An advanced retaining wall structure includes a drain board(200), a wire mesh(600), a geogrid(300), and a filler. The drain board is divided into a vertical drain board(220) adhering to a retaining wall body and a horizontal drain board(240). The wire mesh adheres to the outside of the drain board and is divided into a vertical mesh(620) and a horizontal mesh(640). The geogrid includes a lower part geogrid(320) adhering to the horizontal mesh and an upper end geogrid(340) facing a cut plane or an inclined surface from the upper end of the vertical drain board. The filler is filled on the upper part of the geogrid including the lower part and the upper end geogrid.

Description

Improved Retaining Wall Structure And Construction Method Thereof}

The present invention is a retaining wall construction method of the improved reinforced earth retaining wall, which combines the conventional geogrid rolling method and the wall construction method using sprinkled concrete, and has a temporary structure to maintain the front shape during grid rolling in the field. Unlike the existing methods required, the drainage plate structure is used as a front wall, eliminating the installation and dismantling process of the temporary structure, thereby improving the constructability. By separating the reinforcement soil compaction and the wall construction process, the wall deformation that can be generated by compaction pressure is eliminated. Improved construction and economic efficiency, excellent air shortening effect and quality, and improved retaining wall structure and its construction method by constructing walls using sprayed concrete (shotcrete) with improved durability, away from existing construction methods using formwork. It is about.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram depicted in the FHWA Design Manual (MECHANICALLY STABILIZED EARTH WALLS AND REINFORCED SOIL SLOPES DESIGN & CONSTRUCTION GUIDELINES).

As shown in FIG. 1, the conventional geogrid rolling method temporarily catches and fixes the shape of the geogrid (GEOSYNTHETIC) using FALSEWORK prior to rolling the geogrid (GEOSYNTHETIC), and then fills the PARTIAL BACKFILL. Partially laid out and rolled up the GEOSYNTHETIC.

Subsequently, a backing material is laid to form one layer and repeated to complete a plurality of layers.

In order to maintain the drainage performance of reinforcement soils when rolling the grid, the existing construction method is used in which a crushed stone is rolled on the front and the grid is rolled up to separate the work process from the backfill layer using general soil. After construction, care should be taken to cover the nonwoven fabric in order to prevent the inflow of sediment from the groundwater.

Thus, the conventional geogrid rolling method is made by hand using a construction (FALSEWORK) at the construction site, there is a disadvantage that it is difficult to secure the quality according to the skill of the skilled workers, because the installation and disassembly of the construction (FALSEWORK) is repeated It is difficult to shorten and economical disadvantages.

Therefore, there is an urgent need to develop a method for uniting each layer formed by the geogrid to easily secure the quality, shorten the air, and reduce the cost.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the related art. The purpose is as follows.

First, to provide an improved retaining wall structure and its construction method that can shorten the air and reduce the cost because it maintains the front shape by using the drainage plate that is permanently installed instead of the existing temporary installation that was repeatedly installed and dismantled. do.

Second, the construction of the combination of the pre-fabricated drainage plate and dried geogrid and geogrid support in a layer to provide an improved retaining wall structure and its construction method that is easy to secure a certain quality and quality control.

Third, the present invention provides an improved retaining wall structure and a construction method thereof for constructing a retaining wall with a formwork because it uses high durability shotcrete for concrete structures that can be used as a permanent structure with improved durability.

In order to solve the above technical problem, the present invention is a retaining wall structure that is constructed as a geogrid rolling,

Foundation concrete (BC) is spaced apart from the incision surface or inclined surface construction; Retaining wall reinforcement 110 is reinforced therein and the highly durable shot concrete (SC) for the concrete structure is installed retaining wall 100 is installed on the base concrete; A drain plate 200 that is bent and divided into a vertical drainage plate 220 and a horizontal drainage plate 240 and the vertical drainage plate 220 is installed in close contact with the retaining wall 100; The other end is attached to the inside of the drainage plate 200 in a winding form, the other end of which is in contact with the incision surface or the inclined surface and one end thereof is in contact with the horizontal drainage plate 240 and the vertical drainage plate 220. A geogrid 300 comprising an upper geogrid 340 facing the incision or slope; A geogrid supporter 400 for tightly fixing the geogrid 300 to the drainage plate 200; And a filling material 500 disposed between the lower geogrid 320 and the upper geogrid 340, including the upper geogrid 300.

The combination of the drainage plate 200 and the geogrid 300 and the geogrid support 400 is prefabricated in one unit to form one layer,

It provides an improved retaining wall structure and its construction method characterized in that a plurality of layers are sequentially stacked from the bottom to the top between the cut surface or the inclined surface and the retaining wall 100.

According to the present invention, the following effects are expected.

First, it provides an improved retaining wall structure and its construction method that can shorten the air and reduce the cost because it maintains the front shape by using the drainage plate that is permanently installed instead of the existing temporary installation that was repeatedly installed and dismantled. .

Second, since the combination of the pre-fabricated drainage plate and the dried shape geogrid and geogrid support in a layer to provide an advanced retaining wall structure and its construction method is easy to secure a certain quality and quality control.

Thirdly, the present invention provides an improved retaining wall structure and a construction method thereof for constructing a retaining wall with a formwork because it uses high durability shotcrete for concrete structures that can be used as a permanent structure with improved durability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram depicted in the FHWA Design Manual (MECHANICALLY STABILIZED EARTH WALLS AND REINFORCED SOIL SLOPES DESIGN & CONSTRUCTION GUIDELINES).
2 is a cross-sectional view and a partial detailed view of the improved retaining wall structure of the present invention.
3 is a perspective view of a combination of a drain plate and a geogrid and a geogrid support used in the improved retaining wall structure of the present invention, and a cross-sectional view of a layer of the combination.
4 is a perspective view of a combination of a drain plate 200 and a wire mesh and a geogrid used in another embodiment of the improved retaining wall structure of the present invention, and a cross-sectional view of a layer of the combination.
Figure 5 shows each step of the construction method of the improved retaining wall structure of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1. Improved retaining wall structure

2 is a cross-sectional view and a partial detailed view of the improved retaining wall structure of the present invention, Figure 3 is a perspective view of a combination of the drain plate and the geogrid and geogrid support used in the improved retaining wall structure of the present invention and a cross-sectional view of the layer formed of the combination. to be.

The first embodiment of the improved retaining wall structure of the present invention, as shown in Figures 1 and 2, in the retaining wall structure constructed with a geogrid rolling,

Foundation concrete (BC) is spaced apart from the incision surface or inclined surface construction; Retaining wall reinforcement 110 is reinforced therein and the highly durable shot concrete (SC) for the concrete structure is installed retaining wall 100 is installed on the base concrete; A drain plate 200 that is bent and divided into a vertical drainage plate 220 and a horizontal drainage plate 240 and the vertical drainage plate 220 is installed in close contact with the retaining wall 100; The other end is attached to the inside of the drainage plate 200 in a winding form, the other end of which is in contact with the incision surface or the inclined surface and one end thereof is in contact with the horizontal drainage plate 240 and the vertical drainage plate 220. A geogrid 300 comprising an upper geogrid 340 facing the incision or slope; A geogrid supporter 400 for tightly fixing the geogrid 300 to the drainage plate 200; And a filling material 500 disposed between the lower geogrid 320 and the upper geogrid 340, including the upper geogrid 300.

The combination of the drain plate 200 and the geogrid 300 and the geogrid support 400 is prefabricated into one unit to form one layer, and the incision surface or the inclined surface and the retaining wall 100 A plurality of layers are sequentially stacked from bottom to top between the layers.

As shown in Figure 1 and below, the conventional geogrid rolling method is the front reinforcement of the formwork, such as formwork at the construction site is preceded and made by hand using a temporary (FALSEWORK), there is a disadvantage that it is difficult to secure the quality according to the skill of the skilled workers Because of the repeated installation and dismantling of the temporary work (FALSEWORK), it was difficult to shorten the air and had the disadvantage of low economic efficiency.

However, in the present invention, since the combination of the drain plate 200 and the geogrid 300 and the geogrid support 400 maintains its shape, each layer is united to secure quality and shorten air and reduce azeotropy. There are features that can be saved.

And the drainage plate 200 may be attached to the non-woven fabric and the water sheet on the front and rear, respectively, as shown in Figure 3 (b) water flowing in the upper drain plate (200, 201) in the upper and lower layers (layer) The lower drainage plates 200 and 202 naturally flow out. In addition, the lower portion of the drainage plate lower hole pipe 700 is installed.

The geogrid support 400 is a lower support 420 for tightly fixing the lower geogrid 320 to the horizontal drainage plate 240, as shown in Figure 3 (a); Corner supporter 440 for tightly fixing one end of the lower geogrid 320 to the bent portion of the vertical drainage plate 220 and the horizontal drainage plate 240; And an upper support 460 for tightly fixing one end of the upper geogrid 340 to the stop of the vertical drainage plate 220.
The lower support 420, the corner support 440 and the upper support 460 is characterized in that coupled to each other using a brace 480, by installing a plurality of braces 480 as necessary I can reinforce it.

4 is a perspective view of a combination of a drain plate 200 and a wire mesh and a geogrid used in another embodiment of the improved retaining wall structure according to the present invention, and a cross-sectional view of a layer of the combination.

According to a second embodiment of the improved retaining wall structure of the present invention, as shown in FIG. 4, in a retaining wall structure constructed with a geogrid rolling,

Foundation concrete (BC) is spaced apart from the incision surface or inclined surface construction; Retaining wall reinforcement 110 is reinforced therein and the highly durable shot concrete (SC) for the concrete structure is installed retaining wall 100 is installed on the base concrete; A drain plate 200 that is bent and divided into a vertical drainage plate 220 and a horizontal drainage plate 240 and the vertical drainage plate 220 is installed in close contact with the retaining wall 100; A wire mesh 600 which is attached in close contact with the outside of the drainage plate 200 and is bent to be divided into a vertical mesh 620 and a horizontal mesh 640; The other end is attached to the outside of the wire mesh 600 in the form of a winding so that the other end is directed to the incision surface or the inclined surface and one end is in close contact with the horizontal mesh 640 and the upper end of the vertical mesh 620. A geogrid (300) comprising an upper geogrid (340) facing the incision or inclined surface; And a filling material 500 disposed between the lower geogrid 320 and the upper geogrid 340, and the upper portion of the geogrid 300.

The combination of the drainage plate 200, the wire mesh 600, and the geogrid 300 is prefabricated into one unit to form one layer, and the cut surface or the inclined surface and the retaining wall 100 A plurality of layers are sequentially stacked from bottom to top between the layers.

2. Construction method of improved retaining wall structure

Figure 5 shows each step of the construction method of the improved retaining wall structure of the present invention.

The first embodiment of the improved retaining wall structure construction method of the present invention is for the first embodiment of the improved retaining wall structure of the present invention described above,

(1) ground clearance step of arranging the ground, such as incision surface or inclined surface where the retaining wall is to be installed; (2) laying the foundation reinforcement on the ground spaced apart from the incision surface or inclined surface and constructing the foundation concrete (BC); (3) A combination of the drain plate 200 and the geogrid 300 and the geogrid support 400 which is prefabricated in one unit is provided in one layer between the incision surface or the inclined surface and the retaining wall 100. a first layer assembly construction step of constructing a layer); (4) a first layer laying step including a filling material 500 on the top of the geogrid 300, including between the bottom geogrid 320 and the top geogrid 340; (5) a layer repetition step of laminating a plurality of layers in order by repeating steps (3) and (4) from bottom to top between the incision surface or the inclined surface and the retaining wall 100; And, (6) retaining wall reinforcement 110 on the outside of the vertical drainage plate 220, and install a highly durable shot concrete (SC) for a concrete structure, and retaining wall construction step of constructing the retaining wall 100 on the foundation concrete. It characterized by comprising;

Existing reinforcement soil retaining wall is applying PC (precast) concrete block / panel on the front surface, and recently GRS integrated bridge (Geosynthetic-reinforced soil integral bridge) constructs reinforced concrete structure by pouring in the front in Japan. , Tatsuoka, 2010). The following table compares the differences with existing technologies.

As shown in the above table, the present invention has shown that the installation and dismantling process of the scaffold or temporary installation is reduced, and the formwork and dismantling process is omitted, so that the air saving effect is high.

The second embodiment of the construction method of the improved retaining wall structure of the present invention is for constructing the second embodiment of the improved retaining wall structure of the present invention described above,

(1) ground clearance step of arranging the ground, such as incision surface or inclined surface where the retaining wall is to be installed; (2) laying the foundation reinforcement on the ground spaced apart from the incision surface or inclined surface and constructing the foundation concrete (BC); (3) A combination of the drainage plate 200, the wire mesh 600, and the geogrid 300, which is prefabricated in one unit, is provided between the cut-out surface or the inclined surface and the retaining wall 100. a first layer assembly construction step of constructing a layer); (4) a first layer laying step including a filling material 500 on the top of the geogrid 300, including between the bottom geogrid 320 and the top geogrid 340; (5) a layer repetition step of laminating a plurality of layers in order by repeating steps (3) and (4) from bottom to top between the incision surface or the inclined surface and the retaining wall 100; And, (6) retaining wall reinforcing bars 110 outside the vertical mesh 620 and installing a highly durable shotcrete (SC) for concrete structures, and retaining wall construction step of constructing the retaining wall 100 on the foundation concrete. It characterized by comprising;

In addition, both the first and second embodiments may further include a surface finishing step of finishing the retaining wall 100 after the (6) retaining wall construction step.

The construction method of the improved retaining wall structure according to the present invention is as shown in FIG. 5.

3. High durability for concrete structures Shotcrete

The high durability shotcrete (SC) for concrete structures used in the present invention is to improve the composition and compounding ratio to escape the limitations of the shotcrete used only for temporary reinforcement,

Cement, water, fine aggregate and coarse aggregate; Admixture of 30 to 40% by weight of the weight of the cement with a slag of powder of 4000 or more; Powdered cement mineral or liquid aluminate, 5-10% by weight of the cement quickener; And, 0.5 ~ 1.2% by weight of the fluidized fire; the cement comprising; water cement ratio (W / C) is 40 to 50% and fine aggregate ratio (S / a) is 60 to 65% and coarse aggregate maximum The dimension Gmax is characterized in that 13 mm.

The table below shows the results of the experiment conducted by the Korea Society for Structural Diagnostics and Maintenance Engineering, showing the setting time of each settlement.

Looking at the condensation time according to the present invention of the present invention, cement mineralized fasteners showed faster initialization and termination than the aluminate based fasteners. In the case of cement mineral quickeners and aluminate quickeners, the KCI SC-102 (Qualified Concrete Grade KFT SC-102) quality standard for fasteners was less than 5 minutes and 15 minutes of termination.

The following table shows the results of the experiment conducted by Korea Structural Diagnostics Maintenance Engineering Association.

The optimum formulation of shotcrete that can be used for structural purposes, which is the object of the present invention, was aimed at 24MPa exceeding the design standard strength of 21MPa, and considering the construction error in actual construction, the result of considering the formulation exceeding 28MPa, the powder Figures aimed at mechanical performance in the case of blending a sintering material of 5 to 10% by weight of the cement weight with a mixture of 30 to 40% by weight of the cement weight in the slag of more than 4000, powdered cement mineral or liquid aluminate Appeared to satisfy all.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Therefore, the claims of the present invention include modifications and variations that fall within the true scope of the invention.

BC: Foundation Concrete
SC: High Durability Shotcrete for Concrete Structures
100: retaining wall
110: retaining wall
200, 201, 202: drain plate
220: vertical drain plate
240: horizontal drain plate
300: geogrid
320: lower geogrid
340: Upper Geogrid
400: Geogrid Support
420: lower support
440: corner support
460: upper support
480: brace
500: Filler
600: wire mesh
620: vertical mesh
640: horizontal mesh
700: merit pipe

Claims (7)

In retaining walls constructed with geogrid rolling,
Foundation concrete (BC) is spaced apart from the incision surface or inclined surface construction;
Retaining wall reinforcement 110 is reinforced therein and the highly durable shot concrete (SC) for the concrete structure is installed retaining wall 100 is installed on the base concrete;
A drain plate 200 that is bent and divided into a vertical drainage plate 220 and a horizontal drainage plate 240 and the vertical drainage plate 220 is installed in close contact with the retaining wall 100;
The other end is attached to the inside of the drainage plate 200 in a winding form, the other end of which is in contact with the incision surface or the inclined surface and one end thereof is in contact with the horizontal drainage plate 240 and the vertical drainage plate 220. A geogrid 300 comprising an upper geogrid 340 facing the incision or slope;
A geogrid supporter 400 for tightly fixing the geogrid 300 to the drainage plate 200; And
A filling material 500 disposed between the lower geogrid 320 and the upper geogrid 340 and disposed above the geogrid 300;
, ≪ / RTI >
The combination of the drainage plate 200 and the geogrid 300 and the geogrid support 400 is prefabricated in one unit to form one layer,
Improved retaining wall structure, characterized in that a plurality of layers are sequentially stacked from bottom to top between the incision surface or the inclined surface and the retaining wall (100).
In claim 1,
The geogrid support 400,
A lower supporter 420 for tightly fixing the lower geogrid 320 to the horizontal drainage plate 240;
Corner supporter 440 for tightly fixing one end of the lower geogrid 320 to the bent portion of the vertical drainage plate 220 and the horizontal drainage plate 240; And
An upper support 460 for tightly fixing one end of the upper geogrid 340 to the interruption of the vertical drainage plate 220;
, ≪ / RTI >
The lower support 420, the corner support 440 and the upper support 460 is an improved retaining wall structure, characterized in that coupled to each other using a brace 480.
In retaining walls constructed with geogrid rolling,
Foundation concrete (BC) is spaced apart from the incision surface or inclined surface construction;
Retaining wall reinforcement 110 is reinforced therein and the highly durable shot concrete (SC) for the concrete structure is installed retaining wall 100 is installed on the base concrete;
A drain plate 200 that is bent and divided into a vertical drainage plate 220 and a horizontal drainage plate 240 and the vertical drainage plate 220 is installed in close contact with the retaining wall 100;
A wire mesh 600 which is attached in close contact with the outside of the drainage plate 200 and is bent to be divided into a vertical mesh 620 and a horizontal mesh 640;
The other end is attached to the outside of the wire mesh 600 in the form of a winding so that the other end is directed to the incision surface or the inclined surface and one end is in close contact with the horizontal mesh 640 and the upper end of the vertical mesh 620. A geogrid (300) comprising an upper geogrid (340) facing the incision or inclined surface;
A filling material 500 disposed between the lower geogrid 320 and the upper geogrid 340 and disposed above the geogrid 300;
, ≪ / RTI >
The combination of the drainage plate 200, the wire mesh 600 and the geogrid 300 is prefabricated in one unit to form one layer,
Improved retaining wall structure, characterized in that a plurality of layers are sequentially stacked from bottom to top between the incision surface or the inclined surface and the retaining wall (100).
A method for constructing the improved retaining wall structure of claim 1 or 2,
(1) ground clearance step of arranging the ground, such as incision surface or inclined surface where the retaining wall is to be installed;
(2) laying the foundation reinforcement on the ground spaced apart from the incision surface or inclined surface and constructing the foundation concrete (BC);
(3) A combination of the drain plate 200 and the geogrid 300 and the geogrid support 400 which is prefabricated in one unit is provided in one layer between the incision surface or the inclined surface and the retaining wall 100. a first layer assembly construction step of constructing a layer);
(4) a first layer laying step including a filling material 500 on the top of the geogrid 300, including between the bottom geogrid 320 and the top geogrid 340;
(5) a layer repetition step of laminating a plurality of layers in order by repeating steps (3) and (4) from bottom to top between the incision surface or the inclined surface and the retaining wall 100; And
(6) the retaining wall construction step of constructing the retaining wall 100 on the foundation concrete by placing the retaining wall reinforcement 110 outside the vertical drainage plate 220 and installing high durability shotcrete (SC) for the concrete structure;
Construction method of the improved retaining wall structure characterized in that it comprises a.
5. The method of claim 4,
After the (6) retaining wall construction step,
(7) a surface finishing step of finishing the design on the retaining wall 100; construction method of the improved retaining wall structure further comprises.
As a method for constructing the improved retaining wall structure of claim 3,
(1) ground clearance step of arranging the ground, such as incision surface or inclined surface where the retaining wall is to be installed;
(2) laying the foundation reinforcement on the ground spaced apart from the incision surface or inclined surface and constructing the foundation concrete (BC);
(3) A combination of the drainage plate 200, the wire mesh 600, and the geogrid 300, which is prefabricated in one unit, is provided between the cut-out surface or the inclined surface and the retaining wall 100. a first layer assembly construction step of constructing a layer);
(4) a first layer laying step including a filling material 500 on the top of the geogrid 300, including between the bottom geogrid 320 and the top geogrid 340;
(5) a layer repetition step of laminating a plurality of layers in order by repeating steps (3) and (4) from bottom to top between the incision surface or the inclined surface and the retaining wall 100; And
(6) the retaining wall construction step of constructing the retaining wall 100 on the foundation concrete by placing the retaining wall reinforcement 110 outside the vertical mesh 620 and installing high durability shotcrete (SC) for the concrete structure;
Construction method of the improved retaining wall structure characterized in that it comprises a.
The method of claim 6,
After the (6) retaining wall construction step,
(7) a surface finishing step of finishing the design on the retaining wall 100; construction method of the improved retaining wall structure further comprises.

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