KR101864173B1

KR101864173B1 - Ground attachment type retaining wall and Construction method of it

Info

Publication number: KR101864173B1
Application number: KR1020170174543A
Authority: KR
Inventors: 민경남; 이재원; 권용규; 표강수; 최동찬; 이대성; 이종윤; 김영건; 연제문
Original assignee: ㈜세종이엔씨; (주)다우컨설턴트; 금호산업(주)
Priority date: 2017-12-18
Filing date: 2017-12-18
Publication date: 2018-06-04

Abstract

The present invention relates to a ground attachment type natural bedrock retaining wall, and a construction method thereof. The construction method comprises: a panel preparation step of preparing an upper panel (10a) and a lower panel (10b); an upper panel construction step of constructing the upper panel (10a); a lower reinforcing material construction step; a connection rod installation step; a sheet attachment step of attaching a temporary sheet (400) to protrude to a front side of the upper panel (10a); a temporary assembly step; a connection step; and a lower panel construction step of constructing the lower panel (10b). According to the present invention, a top-down precast panel type retaining wall structure can be conveniently constructed in comparison to the prior art.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a natural rock type retaining wall structure and a method of constructing the same,

The present invention relates to a retaining wall structure for attaching a precast panel to a cut surface for building a retaining wall, and more particularly, And a method of constructing a retaining wall structure.

Ground anchor, Rock bolt, Soil nail, etc. have been used for retaining wall and slope reinforcement to secure slope stability. This type of ground reinforcement is fixed between the structure and the ground, so that the stability of the structure is secured by applying the constraint force or the forward load in the lateral direction or the vertical direction to the structure through the frictional resistance or the pullout resistance with the ground, I will.

Therefore, the ground reinforcement is advantageous when constructing the retaining wall and the temporary earth retaining wall. Especially, it is very useful as the stabilization method of the slope and the reinforcement method of the retaining wall, Trend.

BACKGROUND ART Conventionally, a method of constructing a retaining wall using such a ground reinforcement has been known in which a plurality of ground reinforcements are vertically disposed on a sloped surface of a cut slope, The precast concrete blocks placed on the foundation where the stratified precast concrete blocks are vertically stacked on top of the foundation concrete are installed on the foundation concrete, The pre-cast concrete block is laminated to the top of the cut, while the pre-cast concrete block is fastened with a nut and fixed, and then backfill is performed between the back surface of the precast concrete block and the sloped surface with a back- After completion of the retaining wall construction, the step is moved to the lower part of the first step A construction method of constructing a retaining wall structure inclined in a step shape around the slope has been applied.

The conventional retaining wall constructed in this way enhances the shear strength of the ground by using the ground reinforcement and forms a separate gravity body by fastening the precast concrete block and the ground reinforcement to resist the horizontal earth pressure, And there is no need for large-scale concrete installation work such as precast concrete retaining wall, and it is advantageous that construction period is relatively short because it is constructed by assembling type.

However, in the method of constructing the retaining wall as described above, there is a risk of collapse during the cutting operation due to the inclined cutting operation in which the cut-off surface is highly exposed, and the construction cost is increased due to an increase in the amount of excavated soil.

Particularly, since the retaining wall is constructed with a slope in the form of a staircase, the slope height and the height of the retaining wall are unnecessarily high, so that the construction cost is excessively increased and the construction paper can not be secured.

In addition, since the backfill material is made of soil, loss of backfill may occur due to an effect such as rainwater or underground water after construction. In this case, the adhesion between the ground and the concrete block is loosened and the stability of the slope is lowered.

As a technique for solving the problem of such a stepped-wall block building, a "pre-tensioned soil nail method by top-down method" (Korean Patent Registration No. 10-0842372, Patent Document 1) A method is disclosed in which a pre-tensioned soil nail is inserted by inserting a concrete grid plate into a perforated hole, and a pre-cast concrete panel is closely contacted. have.

However, when the slope is cut vertically at one time, there is a problem that the soil is collapsed due to the earth pressure before the ground reinforcement is installed. Therefore, when the incised slope is composed of the slope, it is practically difficult to apply the method.

In addition, since cement is sprayed in a wet manner at the construction site, there are problems that the air is delayed and the construction cost is increased due to a large number of variables depending on the nature of the site and the weather.

As a technique for solving such a problem, a method of cutting a cut slope on which a retaining wall is to be constructed is described in "Method for Landfill Nailing Reinforced Slope Connection Top-Down Block Type Reinforced Earth Retaining Wall Construction ", Korean Patent Laid-Open No. 10-2014-0013497 The upper and lower ends are formed as vertical surfaces, the upper end is cut off, the retaining wall is vertically installed, and the lower end is cut vertically and the retaining wall is vertically installed.

However, in the case of Patent Document 2, as a whole, it becomes a retaining wall of a staircase type, and as described above, there still exists a problem that the construction cost is insufficient and the business paper is not secured.

In addition, Patent Document 2 also forms a retaining wall by wet concrete pouring, which causes problems such as construction delay and construction cost increase as in Patent Document 1.

On the other hand, as a technique for solving the problems of the wet top-down method such as Patent Documents 1 and 2, there has been proposed a method of "a retaining wall structure with a curved surface capable of processing a curved surface" filed by the applicant of the present invention -1590057, and Patent Document 3).

Patent Document 3 discloses that a curved portion can be processed by connecting a precast panel in an upper layer and a precast panel in a lower layer through connection pins, and a top-down type can be constructed.

However, in the construction of such a structure, the connecting pin is inserted into the precast panel at a sufficiently deep depth to be firmly connected and supported. When the precast panel of the upper layer is installed, the lower layer is cut vertically and the ground reinforcement It is difficult to assemble the precast panel because the length of the connecting pin is long because the center of the precast panel is inserted into the ground reinforcement and the precast panel of the upper layer and the connection pin I can not help but notice.

Specifically, the precast panel and the connecting pin should be connected to each other so that the upper layer pre-cast panel and the connecting pin are connected to each other by inserting the ground reinforcement fixed to the cut-away surface in the center hole of the precast panel. Therefore, It is difficult to fix the precast panel when the allowable diameter of the holes for penetrating the ground reinforcement is increased to an infinite value. I can not help but notice.

KR 10-0842372 (June 24, 2008) KR 10-2014-0013497 (2014.02.05) KR 10-1590057 (2016.01.25)

The method for constructing a natural-rock type retaining wall structure according to the present invention is for solving the above-described problems in the prior art, and it is an object of the present invention to provide a method of constructing an upper panel and a lower panel To make it easier.

More specifically, when producing a panel, the precast panel is manufactured in a state of being inserted into the upper and lower portions of the precast panel, and the connecting rod, which is fitted to the lower and upper tubes, The connecting rod is inserted into the lower pipe so as to be coincident with or slightly protruded from the panel with a length of about 0 to 10 mm from the pipe length, and then the connecting rod, which is inserted into the lower pipe, The connecting sheet can be sufficiently inserted into the upper pipe of the lower panel by pulling out the temporary sheet in a state of being straight or slightly inserted and assembled, so that the operation of fitting the precast panel to the ground reinforcement and the operation of connecting to the upper panel can be performed simultaneously So as to improve the workability.

In addition, the upper tube is formed with a guide portion having a trumpet-shaped upper end, so that the connection of the connecting rod can be facilitated.

Further, it is possible to improve the accuracy of the horizontal alignment of the foundation with ease by using the support device which can adjust the length when constructing the foundation to the lower side of the lower bottom panel.

In order to achieve the above object, the present invention provides a natural-rock type retaining wall structure for a floorboard, wherein a front face (11) is formed in a natural stone shape, and a reinforcing material through hole (12) penetrating the center of the rear face from the center The upper tube 100 and the lower tube 200 are integrally inserted into the upper and lower ends of the upper tube 100 and the upper tube 100, respectively, A panel preparation step of preparing the upper panel 10a and the lower panel 10b with a longer precast panel 10; The head portion of the ground reinforcement member 20 is passed through the reinforcing material through hole 12 of the precast panel 10 through the through hole 12 of the precast panel 10, An upper panel constructing step for constructing the upper panel 10a by injecting a filling mortar into the space between the back surface of the precast panel 10 and the cut surface, and curing the upper panel 10a; A lower ground reinforcement material construction step of vertically cutting the upper panel 10a from the upper part to the lower part and then fixing the ground reinforcement 20 to the cut-off surface by inserting it; The connecting rod 300 is inserted into the lower tube 200 of the upper panel 10a so that the lower end of the connecting rod 300 is aligned with or coincident with the upper panel 100, A connecting rod protruding from the lower end of the pipe 200; A flexible temporary sheet 400 is installed at the lower end of the upper panel 10a so as to prevent the connecting rod 300 from escaping from the lower pipe 200 after the provisional sheet is prepared, So as to protrude from the front portion of the sheet member; The lower portion of the connecting rod 300 protruded to the lower portion of the upper panel 10a while the lower panel 10b is installed such that the head portion of the ground reinforcement 20 fixed on the cut- (100) of the upper tube (100), or to be in a straight line; The connection sheet 300 is pulled down to remove the temporary sheet 400 protruding from the front surface of the upper panel 10a so that the connecting rod 300 moves downward and the lower end of the connecting rod 300 contacts the lower end of the upper tube 100 of the lower panel 10b And the upper portion of the connecting rod 300 is fitted to the lower portion of the lower tube 200 while being spaced apart from the upper portion of the lower tube 200 of the upper panel 10a; And a lower panel construction step of injecting curing mortar between the back surface of the lower panel 10b and the lower cut surface to construct the lower panel 10b.

In the above-described configuration, in the panel preparing step, the upper pipe 100 of the precast panel 10 is formed with a tapered guiding portion having upper and lower ends in an upper portion. In the gluing and bonding step, And is assembled so as to fit into the guide portion on the upper tube of the panel 10b.

A support reinstalling step of excavating the natural slope to the lower part of the lower panel 10b installed in the lower panel construction step and installing the support member on the excavated floor so as to be spaced apart from the lower panel 10b; A support device mounting step of installing a support device 500 having an upper portion fitted in a lower tube 200 of the lower panel 10b and a lower end supported on the support member; And a base applying step of forming a foundation by injecting concrete into the excavated space.

In addition, the supporting device 500 includes a fitting pipe 510 fitted in the lower pipe 200 and having a thread formed on the inner peripheral surface thereof; And an upper portion of which is screwed to the inside of the fitting pipe 510 so as to be protruded downward from the fitting pipe and the lower portion of which is seated on the supporting member.

According to the present invention, assembly of the upper panel and the lower panel, which is problematic in the construction of the top-down retaining wall using the conventional precast panel, can be simplified.

More specifically, the pre-cast panel is prepared with inserts in the upper and lower portions of the pre-cast panel, wherein the lower portion of the tube is longer than the upper portion of the tube, The connecting rod is inserted into the lower tube so as to protrude slightly from 0 to 10 mm, and then the connecting rod inserted into the lower tube is prevented from being separated from the lower tube by the provisional sheet. Then, the upper tube of the lower panel is inserted into the connecting rod The lower portion of the connecting rod is sufficiently inserted into the upper pipe of the lower panel by pulling out the temporary sheet in the assembled state so that the operation of fitting the precast panel to the ground reinforcement and the operation of connecting to the upper panel can be performed simultaneously, .

In addition, since the upper portion of the upper tube is formed with a guide portion extending in a trumpet shape, it is possible to easily assemble the connecting rod.

Further, in the construction of the foundation to the lower side of the bottom panel at the lowermost stage, it is possible to easily perform the foundation work and improve the accuracy of the horizontal alignment of the foundation by using a support device capable of adjusting the length.

1 is a partially cut exploded perspective view showing a state in which an upper panel and a lower panel are assembled using a connecting rod in the present invention.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a method of constructing a natural rock-
3 is a cross-sectional view showing a state where bases are installed under the lowermost panel in the present invention.
4 is a cross-sectional view illustrating a method of constructing a natural rock-type retaining wall structure of the present invention;
(A) is a sectional view showing a state in which the upper panel is installed.
(B) is a sectional view showing a state in which the cut soil and the anchor are fixed for the lower panel construction.
(C) is a cross-sectional view showing a state in which a connecting rod is fitted to an upper panel and a ground reinforcement is fitted to a lower panel in a state where a temporary seat is attached.
(D) is a sectional view showing a state in which the lower panel is assembled.
(E) is a sectional view showing a state in which the temporary sheet is removed in a state where it is assembled.
(F) is a sectional view showing the moving state of the connecting rod in accordance with the removal of the temporary seat.
(G) is a sectional view showing a state in which the ground reinforcement and the lower panel are fixed to the back surface of the lower panel after the mortar injection.

In the present invention, the natural rock type retaining wall structure of the present invention is characterized in that a ground reinforcement material is inserted into a ground sheet in a state of being cut vertically or nearly perpendicularly in such a manner as reinforcing steel, stranded wire, grouting, Cast panel, and the construction is for a backboard-type retaining wall structure to which a top-down type is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of constructing a natural rock type retaining wall structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1. Panel preparation steps

The precast panel 10 in which the front surface 11 takes the shape of a natural stone is prepared.

The precast panel 10 is divided into an upper panel 10a and a lower panel 10b, which are located on the upper side and the lower side, respectively, in the relationship between the upper and lower adjacent panels in the subsequent construction process Explain.

As shown in Fig. 1, the precast panel 10 is formed with a reinforcing material through hole 12 passing through the center of the rear face from the center of the front face 11.

The reinforcing material through-hole 12 is preferably formed to have a stepped portion as shown in the figure.

In addition, in the structure of the present invention, a plurality of precast panels 10 are disposed adjacent to each other in the up, down, left, and right directions, and protrusions 15 and grooves 16 for interconnecting are formed on both sides.

It is preferable that the projections 15 and the grooves 16 are formed in a rounded shape so as to facilitate the processing of the curved surface portion as in Patent Document 3.

The precast panel 10 used in the present invention has a weight in excess of several hundreds of kilograms to one ton in terms of its weight, and it is difficult to lift or assemble the precast panel 10 with manpower, so that equipment such as a crane or a forklift is utilized Should be.

To this end, an unillustrated traction ring may be formed on the backside.

The precast panel 10 is manufactured by curing while pouring concrete into a mold frame. The upper pipe 100 and the lower pipe 200 are integrally inserted into upper and lower ends of the precast panel 10, Is longer than the length of the upper tube (100).

The length of the lower tube 200 and that of the upper tube 100 are different so that the connecting rod 300 to be described later protrudes only a small length from the lower tube 200, So as to be deeply inserted into both sides of the upper tube 100 and the lower tube 200.

The upper tube 100 of the precast panel 10 may have the same cylindrical shape as the upper and lower inner diameters. However, as shown in the third drawing from the upper side of FIG. 2, the upper tube 100 may have a tapered shape, A portion 110 may be formed.

When the guide part 110 is formed, it is guided to fit the upper pipe of the connecting rod 300 and the lower panel 10b in a later-described cooperating step, thereby facilitating assembly.

2. Top panel construction step

As shown in the upper part of FIG. 2 and the upper part of FIG. 4 (A), the ground slope is vertically cut to the lower part from the upper part of the natural slope, After the head portion of the ground reinforcement 20 is passed through the reinforcing material through hole 12, the filling mortar is injected into the space between the back surface of the precast panel 10 and the cut surface to cure the upper panel 10a, do.

In the drawing, reference numeral 50 denotes a grouting layer 50 formed by inserting and curing a grouting solution around a ground reinforcement 20 in a perforation hole. In FIG. 4, reference numeral 21 denotes a reinforcing material through hole 12 Shaped fastener 21 in which an anchor body 20 protruding out of the precast panel 10 is fixed through a through-hole (not shown).

At this time, the precast panel 10 is formed such that the front surface of the anchor body through-hole 12 is formed in a stepped manner so that the fastener 21 is not exposed to the outside in the state where the fastener 21 is installed, An unshown cover of the same texture can be fastened and closed.

The ground reinforcement 20 may be composed of a rock bolt, an earth anchor, a rebar, a steel pipe, or the like.

In addition, reference numeral 60 denotes an in-filled mallet layer 60 filled in the space between the back surface of the precast panel 10 and the cut-off surface.

3. Construction step of lower ground stiffener

4 (B), the upper panel 10a is vertically cut from the upper part to the lower part of the lower panel 10a, and then the ground reinforcement 20 is inserted into the cut- do.

More specifically, the grooved reinforcement 20 is inserted into the perforated hole after the grooved surface (a) is punched horizontally or obliquely, and the grouting solution is injected into the periphery of the hole to cure the grouting layer 50.

At this time, as shown in the figure, it is apparent that the ground reinforcement 20 is provided to protrude to the outside of the cut-off surface a.

4. Connecting rod installation steps

The connecting rod 300 having the same length as that of the lower tube 200 is prepared as shown in the second and upper portions of FIG. 2 and FIG. 4C, And the lower end of the connecting rod 300 is fitted to the lower end of the lower pipe 200 with the connecting rod 300 interposed therebetween.

At this time, the length of the connection rod 300 protruding to the lower end of the lower tube 200 can be from 0 mm to 10 mm.

However, it is more preferable that the length is less than 0 mm and longer than 5 mm.

This is because the distance between the cut surface (a) and the precast panel 10, the distance between the inner diameter of the reinforcing material through hole 12 and the outer diameter of the ground reinforcement 20, The ground reinforcement 20 penetrates through the reinforcing material through hole 12 of the lower panel 10b when the lower panel 10b is installed and the angle at which the lower panel 10b can rotate according to the inner / The actual lower panel 10b may be attached to the ground reinforcement 20 by examining the length of the connecting rod 300 projected to the lower end of the upper panel 10a and the like so that the upper edge of the upper panel 10a is not caught by the lower edge of the upper panel 10a, And the degree of smoothness of the fitting and the joining of the connecting rod 300 is smooth.

If the length of the lower panel 10b is less than the minimum length, the guide of the connecting rod 300 may be unreliable and difficulty in aiming for the downward movement of the connecting rod 300 occurs. On the other hand, It is difficult to adjust the distance.

At this time, although the connecting rod 300 may be formed in the form of a steel pipe, it is preferable that the connecting rod 300 is in the form of a steel rod because the load in the connected state is smoothly supported and prevented from being deformed.

5. Attach the sheet

A soft temporary sheet is prepared as shown in the second and upper diagrams of FIG. 2 and FIG. 4C. Then, the connecting rod 300 is attached to the lower end of the upper panel 10a so as to prevent the connecting rod 300 from coming out of the lower tube 200 A flexible temporary sheet 400 is provided.

At this time, it is preferable that the temporary sheet 400 is attached so as to protrude from the front portion of the upper panel 10a so that the operator can easily pull the temporary sheet 400 in the connection step described later.

As a preferred embodiment of the temporary sheet 400, an adhesive having an adhesive strength enough to prevent the connecting rod 300 from being pulled out is temporarily applied to the bottom surface concrete material of the upper panel 10a on the upper surface thereof, It is preferable that the material is such that it is temporarily adhered like a post-itt and can be separated from the adhesive surface by the force of pulling by the user.

However, since the connecting rod 300 may not be dropped when the upper panel 10a and the lower panel 10b are torn when they are removed in a state in which the upper panel 10a and the lower panel 10b are in close contact with each other, It is preferable to be made of a material which is tough enough to be able to escape to the outside without being torn by the pulling force.

On the other hand, the temporary sheet 400 may be composed of a material which is decomposed by an acid or a basic solution or burned by a flame, and may be composed of a material which can be removed by chemical reaction, combustion or the like, In this case, in the case of chemical treatment or combustion treatment, it is preferable that the flexible sheet is temporarily adhered as if it is a bandage, an adhesive tape, or the like as described above because it is not environmentally friendly such as contamination and fire of a panel.

6. Steps of assembling

The lower panel 10b is installed so that the head portion of the ground reinforcement 20 fixed on the cut surface of the lower portion of the upper panel 10a passes through as shown in the third and fourth figures of FIG. The lower portion of the connecting rod 300 protrudes to the lower portion of the lower panel 10b.

2, the connecting rod 300 is guided by the guiding part 110 in a connecting step, which will be described later, so that the connecting rod 300 is guided by the guide part 110 of the lower panel 10b, (Not shown).

In this case, the protruding length of the connecting rod 300 can be minimized in the above-mentioned range.

4, in which the guide portion 110 is not formed, the protruded portion of the connecting rod 300 is installed so as to be easily inserted into the upper tube 100 of the lower panel 10b.

7. Connection step

The temporary sheet 400 protruding from the front surface of the upper panel 10a is pulled out as shown in the third and upper part of FIG.

In this case, as shown in FIG. 4 (F), the connecting rod 300 moves downward and the lower end of the connecting rod 300 is fitted to the lower end of the upper tube 100 of the lower panel 10b.

The upper part of the connecting rod 300 is separated from the upper part of the lower tube 200 of the upper panel 10a by the difference in length between the upper tube 100 and the lower tube 200 and the length of the connecting rod 300, And is fitted in the lower portion of the lower tube 200.

It is preferable that the length of the upper tube 100 is about 2/5 to 3/5 of the length of the lower tube 200 so that the lengths of the upper tube 100 can be made as uniform as possible.

This state is inserted into the upper tube 100 and the lower tube 200 of the connecting rod 300 at a substantially uniform depth as shown in FIG. 4 (F).

It is preferable that the length of the connection rod 300 projecting to the lower portion of the lower tube 200 is 1/10 or less of the length of the lower tube 200 or the connection rod 300 when the ratio is measured.

As shown in the figure, the upper portion of the lower tube 200 is in an empty state in which the connecting rod 300 is not inserted. The lower portion of the upper panel 10a is connected to the lower panel 10b, Will have no effect on support.

Further, when a direct impact is generated in the ground, the upper panel 10a provides a space for the upper side to be moved by the margin, thereby helping to prevent the collapse of the structure from a disaster such as an earthquake.

5, a draw-out guide groove 13 extending from the upper tube 100 to the upper front edge of the lower panel 10b is formed on the upper surface of the lower panel 10b, When the temporary sheet 400 is pulled out, the one side of the temporary sheet 400 is pulled out from the bottom surface of the upper panel 10a and the upper surface of the lower panel 10b in an uncompressed state so as to be smoothly taken out .

In this case, when the temporary sheet 400 is pulled out, one side of the temporary sheet 400 is pressed between the upper panel 10a and the lower panel 10b, and a downward movement and fitting of the connecting rod 300 is interrupted The connecting rod 300 can be moved downward and assembled through the connecting rod 300 without any problem.

8. Lower panel construction step

As shown in the lower part of FIG. 2 and FIG. 4 (G), the tightening tool 21 is provided on the ground reinforcement 20 protruding into the reinforcing material through hole 12 of the lower panel 10b to form the ground reinforcement 20 The lower panel 10b is fixed to the upper panel 10b and the lower panel 10b is filled with the inner filling mortar between the back surface of the lower panel 10b and the lower cut surface to finish the construction of the lower panel 10b.

In the figure, an example in which two precast panels 10 are installed in upper and lower portions for convenience of understanding is shown. In the same manner as the lower panel 10b in the drawing, This can be done.

At this time, after the completion of the construction of the lowermost precast panel 10, a base for supporting the retaining wall must be constructed.

Fig. 3 shows the steps for constructing the foundation.

The process for constructing the foundation may comprise a support reinstallation step, a support device installation step, and a foundation construction step.

As shown in the upper part of FIG. 3, the supporting part is installed in a lower part of the lower panel 10b in the lower panel construction step, and a supporting member 600, such as a structural neck, (10b).

The supporting device 500 is installed on the lower tube 200 of the lower panel 10b and the lower end of the supporting device 500 is supported on the supporting member 600. [

This configuration can utilize the lower tube 200 formed on the lower panel 10b at the lowest stage and prevent the detachment of the structure. It is possible to maintain the support state and not to be separated.

In the basic construction step, the concrete is injected into the remaining excavated space and cured to construct the foundation 700.

In this case, however, the bottom surface of the lower panel 10b is not parallel to the ground surface. In this case, In the present invention, it is preferable that the length of the supporting device 500 is adjustable.

To this end, the supporting device 500 includes a fitting tube 510 fitted in the lower tube 200 and having a thread on the inner peripheral surface thereof; The upper portion may be a screw that is screwed into the fitting pipe 510 so that the protruding length of the fitting pipe 510 is adjusted downward and the lower portion of the adjusting rod 520 is seated on the supporting member 600.

In addition, since the horizontal portion 521 formed in the horizontal direction as shown in the lower part is integrally formed as the lower portion of the control rod 520, the contact area is increased to stably support the load and to prevent the structural neck from being damaged due to the concentrated load desirable.

When the foundation is installed through the support device 500 having such a length, it is possible to horizontally adjust the entire structure even though the lower panels 10b are horizontally installed, irrespective of the construction state of the structure and horizontal inconsistency of the structural members If the foundation is installed in this state, the steel support device 500 is built in, and a solid foundation can be formed.

Although it has been shown and described in the drawings of the present invention described above that the connecting rod 300 is installed only in the center of each precast panel 10, it is obvious that a plurality of connecting rods 300 may be provided.

However, as described in Patent Document 3, in consideration of the easiness of the curved surface construction, it is preferable to be installed at the center as described above so as to be able to fit to the curved surface portion.

The natural-rock-type retaining wall structure of the present invention and the construction method thereof are preferred when the cut-off surface is formed vertically or at an inclination angle close to the vertical direction. In addition, , It will be effective when applied to a curved surface portion.

10: precast panel 10a: upper panel
10b: lower panel 11: front
12: Reinforcing material through hole 13: Drawing guide groove
15: projection 16: home
20: Ground reinforcement 21: Tightening means
50: grouting layer 60: fillet mortar layer
100: upper tube 110: guide portion
200: lower tube 300: connecting rod
400: temporary sheet 500: support device
510: insert tube 520: adjustable rod
521: horizontal part 600: supporting member
700: Foundation a: Cutting surface

Claims

The front surface 11 is formed in a natural stone shape and has a reinforcing material through hole 12 penetrating through the center of the rear surface from the center of the front surface 11. The reinforcing material through hole 12 is formed by curing the concrete with the concrete poured therein, The upper panel 10a and the lower panel 10b are integrally formed with the upper panel 100 and the lower panel 200. The lower panel 200 is longer than the upper panel 100, Preparing a panel;
The head portion of the ground reinforcement member 20 is passed through the reinforcing material through hole 12 of the precast panel 10 through the through hole 12 of the precast panel 10, An upper panel constructing step for constructing the upper panel 10a by injecting a filling mortar into the space between the back surface of the precast panel 10 and the cut surface, and curing the upper panel 10a;
A lower stiffener constructing step of vertically cutting the lower panel of the upper panel 10a from the upper part to the lower part and then fixing the ground reinforcement 20 to the cut-off surface by inserting it;
The lower end of the connection pipe 300 is connected to the lower pipe 200 of the upper panel 10a by inserting the connecting rod 300 having the same length as the length of the lower pipe 200, A connecting rod mounting step of fitting or protruding to the lower end;
A flexible temporary sheet 400 is installed at the lower end of the upper panel 10a so as to prevent the connecting rod 300 from escaping from the lower pipe 200 after the provisional sheet is prepared, So as to protrude from the front portion of the sheet member;
The lower portion of the connecting rod 300 protruded to the lower portion of the upper panel 10a while the lower panel 10b is installed such that the head portion of the ground reinforcement 20 fixed on the cut- (100) of the upper tube (100), or to be in a straight line;
The connection sheet 300 is pulled down to remove the temporary sheet 400 protruding from the front surface of the upper panel 10a so that the connecting rod 300 moves downward and the lower end of the connecting rod 300 contacts the lower end of the upper tube 100 of the lower panel 10b And the upper portion of the connecting rod 300 is fitted to the lower portion of the lower tube 200 while being spaced apart from the upper portion of the lower tube 200 of the upper panel 10a;
And a lower panel (10b), wherein the lower panel (10b) is formed by injecting and curing an inner filling mortar between a back surface of the lower panel (10b)
Construction method of natural rock type retaining wall structure attached with paperboard.

The method according to claim 1,
In the panel preparation step, the upper tube 100 of the precast panel 10 is formed with a guide portion having a tapered shape,
The connecting rod 300 is assembled to the upper tube of the lower panel 10b so as to be fitted into the guide portion.
Construction method of natural rock type retaining wall structure attached with paperboard.

The method according to claim 1,
A supporting part reinstalling step of excavating the natural slope to the lower part of the lower panel 10b installed in the lower panel construction step and disposing the support member 600 on the excavated floor surface so as to be spaced apart from the lower panel 10b;
A support device installing step of installing a support device 500 having an upper portion fitted in a lower tube 200 of the lower panel 10b and a lower end supported on the support member 600;
And a foundation construction step of forming a foundation (700) by injecting and curing concrete into the excavated space.
Construction method of natural rock type retaining wall structure attached with paperboard.

The method of claim 3,
The support device comprises:
A fitting tube 510 fitted in the lower tube 200 and formed with a thread on an inner peripheral surface thereof;
And the upper part is configured to be screwed to the inside of the fitting pipe 510 to adjust the length protruding downward from the fitting pipe 510 and the lower part to be fixed to the supporting member 600 As a result,
Construction method of natural rock type retaining wall structure attached with paperboard.

In a natural rock-type retaining wall structure attached to a paperboard,
A construction method according to any one of claims 1 to 4,
Natural rock type retaining wall structure attached with paperboard.