JP2013092011A - Earth retaining jig for repaired portion of reinforced soil wall, earth retaining method using the earth retaining jig, and repair method for reinforced soil wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair method for a reinforced soil wall capable of shortening a construction period and reducing construction cost as compared with a conventional method, an earth retaining method used for the repair method, and an earth retaining jig used for the earth retaining method.SOLUTION: An earth retaining jig includes at least: a pressure receiving part arranged on an exposed surface of a banking; and a connection part for fixing a reinforcement material exposed from the banking. An earth retaining method arranges the earth retaining jig on a banking surface while removing a wall surface material to be repaired so as to easily carry out earth retaining. A repair method for a reinforced soil wall constructs a new wall surface material after the earth retaining method. At that time, the earth retaining jig may be removed or may be left buried.

Description

  The present invention relates to a earth retaining jig used for repairing a place where a wall surface material has fallen off due to deformation of a reinforcing earth wall, a technique for retaining earth using the earth retaining jig, and a method for repairing a reinforcing earth wall. is there.

The reinforcing earth wall is a soil retaining structure that includes at least a wall material, a fill provided on the back surface of the wall material, and a reinforcing material connected to the wall material and arranged inside the bank. .
The reinforced earth wall can exert a soil retaining effect by maintaining a balance with the pulling resistance force of the reinforcing material against the earth pressure acting on the wall surface material.

When the reinforced earth wall is deformed due to various factors such as an earthquake and the wall material constituting the reinforced earth wall is dropped, a large-scale repair is required.
A conventional method when a large-scale repair of a reinforced earth wall is required will be described with reference to FIG.

(1) Mountain fastener (Fig. 5 (a))
First, a mountain fixing work is applied to the back surface of the falling part of the wall surface material a.
A known method using a mountain retaining material d such as a steel sheet pile or a main pile transverse sheet pile can be employed for the mountain fastening.
The placing work of the mountain retaining material d is performed with a placing apparatus carried into the top end of the reinforced earth wall.
(2) Excavator (Fig. 5 (b) (c))
While excavating the embankment b on the front side of the mountain retaining wall d constructed by the mountain retaining work, the wall material a at the corresponding location is removed to construct the excavation space f.
The excavation work of the embankment b is generally performed with a heavy machine e (such as a long arm backhoe) carried into the top end of the reinforced earth wall.
(3) Reconstruction of wall surface (Fig. 5 (d))
In the excavation space f, a new embankment i is performed while arranging a new wall material g and a reinforcing material h in order from the bottom, and a new reinforced earth wall is constructed.

However, according to the conventional repair method described above, at least one of the following problems may occur.
(1) Problems related to mountain retaining work There is a limit to the saving of materials because the mountain retaining work requires a mountain retaining material to reach the wall material to be repaired. In addition, it is necessary to arrange a transport vehicle, a driving device, and the like up to the top of the reinforced earth wall for transporting and placing these materials.
(2) Problems related to excavation To excavate the embankment in front of the retaining wall, it is necessary to arrange heavy machinery such as long arm backhoes to the top of the reinforced earth wall.

  As described above, according to the conventional construction method, when the work site is a steep place such as a mountainous area, a lot of labor is required for transporting materials, arranging heavy machinery, placing, and excavation work. -There was a limit to the cost savings.

  Therefore, the present invention has an object to provide a method for repairing a reinforced earth wall capable of reducing the construction period and cost compared to the conventional method, a soil retaining method used in the repair method, and a soil retaining jig used in the soil retaining method. To do.

  A first invention of the present application is a reinforced soil wall including at least a wall surface material, a fill provided on a back surface of the wall surface material, and a reinforcing material connected to the wall surface material and disposed inside the fill material. A earth retaining jig for retaining earth exposed due to breakage or falling off, and at least a pressure receiving part placed in contact with the exposed surface of the bank and a connecting part for fixing a reinforcing material exposed from the bank An earth retaining jig is provided.

  Further, the second invention of the present application is a method of retaining the earth of the reinforced earth wall using the earth retaining jig according to the first invention, wherein (a) while removing the wall material to be repaired, A part of the embankment on the back side of the wall material is excavated to form an installation space for the earth retaining jig, (b) the earth retaining jig is installed on the exposed surface of the earth embankment, and (c) connection of the earth retaining jig. The reinforcing material exposed from the embankment is fixed by the part, and (d) the steps (a) to (c) are sequentially performed for each wall material to be repaired to construct the earth retaining surface. And provide a method of retaining soil at the repair site of the reinforced earth wall.

  A third invention of the present application is a method for repairing a reinforced earth wall using the earth retaining method according to the second invention, wherein after the earth retaining surface is constructed by the step (d), (e1) The present invention provides a repair method for a reinforced earth wall, characterized in that a new wall surface material is constructed while removing the earth retaining jig constituting the earth retaining surface in order from the bottom.

  The fourth invention of the present application is a method for repairing a reinforcing earth wall using the earth retaining method according to the second invention, wherein after the earth retaining surface is constructed by the step (d), (e2) The present invention provides a repair method for a reinforced earth wall, characterized in that a new wall surface material is constructed in front of the earth retaining surface while maintaining the earth retaining surface.

According to the present invention, at least one of the effects described below can be obtained.
(1) According to the earth retaining jig of the present invention, it is not necessary to arrange a long pile retaining material such as a steel sheet pile, a main pile, a lateral sheet pile, etc. at the time of mountain fastening. There is no need to secure a temporary yard. In addition, it is not necessary to secure, transport, or install materials, which can contribute to a significant reduction in work period and cost.
(2) According to the earth retaining method of the present invention, since it is not necessary to arrange heavy machinery at the time of mountain mounting, it is possible to work even in rugged sites such as mountainous areas. It is also possible to retain earth while keeping the amount of excavation of the embankment to a minimum. Therefore, it can contribute to a significant reduction in the construction period and cost.
(3) According to the repairing method of the present invention, the earth retaining jig can be reused, which can contribute to shortening the construction cost. The entire work only needs to be a wall material installation work and a minimum embankment work, which can contribute to shortening the construction period.
(4) According to the repair method of the present invention, a state in which a simple retaining wall constructed by a retaining jig exists on the back side of the wall surface material can be maintained, so that a reinforced soil wall having a higher retaining effect can be provided. I can expect.

The top view and front view of the earth retaining jig which concern on this invention. The schematic front view which shows the earth retaining method which concerns on this invention. The schematic front view which shows an example of the repair method which concerns on this invention. The schematic front view which shows the other example of the repair method which concerns on this invention. The schematic front view which shows the repair method of the conventional reinforced earth wall.

Embodiments of the present invention will be described below with reference to the drawings.
In addition, the reinforcing earth wall A which this invention presupposes is the reinforcement which arrange | positions the wall surface material 2, the embankment 3 provided in the back surface of this wall surface material 2, and the said wall surface material 2, and distribute | arranges to the inside of the said embankment 3 The earth retaining structure including at least the material 4.
The reinforced earth wall A is not limited to a straight wall, and may be provided with a gradient.

First, the earth retaining jig used for the repair method of the reinforced earth wall will be described.
<1> Overall Configuration FIG. 1A is a plan view of an earth retaining jig according to the present invention, and FIG. 1B is a front view of the earth retaining jig according to the present invention.
The earth retaining jig 1 according to the present invention includes at least a pressure receiving portion 11 placed in contact with the exposed surface of the embankment 3 and a connecting portion 12 that fixes the reinforcing material 4 exposed from the embankment 3.

<2> Pressure receiving part The pressure receiving part 11 is a member for receiving the earth pressure from the embankment 3.
The pressure-receiving part 11 can be comprised with the flat plate member which has the earthing | grounding surface 111 to embankment in the front.
In addition, the shape of the pressure receiving part 11 may be any shape as long as it can receive the earth pressure from the embankment.
The pressure receiving portion 11 is provided with a through hole 112 for inserting the exposed reinforcing material 4.

<3> Connecting part The connecting part 12 is a member for connecting and fixing the reinforcing material 4.
The connection part 12 can be comprised by the cylindrical member which has the insertion space 121 for inserting the exposed reinforcement material 4. As shown in FIG. The cross-sectional shape of the insertion space 121 may be any shape such as a circle, an ellipse, or a polygon.
The connecting portion 12 is attached to the back side of the pressure receiving portion 11 so that the insertion space 121 communicates with the through hole 112 of the pressure receiving portion 11.
The connecting portion 12 is appropriately provided with a connecting hole 122, and the reinforcing member 4 inserted into the insertion space 121 is configured to be freely fixed by a well-known fixing means (not shown) such as a bolt.

<4> Usage Method The earth retaining jig 1 is inserted through the reinforcing material 4 exposed from the embankment in the order of the through-hole 112 of the pressure-receiving portion 11 and the inside of the connecting portion 12, and the pressure-receiving portion 11 is exposed on the embankment. 31 to be grounded.
And after tensioning the reinforcing material 4 appropriately, it bolts and fixes the earth retaining jig 1 to the embankment surface.
By the above usage method, the earth retaining function can be exhibited in the entire earth retaining jig 1.

According to this embodiment, it is not necessary to arrange long piles such as steel sheet piles, main piles, and horizontal sheet piles at the time of pile mounting, so it is necessary to secure a large temporary yard for stocking those materials. There are advantages to not.
In addition, since it is not necessary to secure, transport, and install long materials, it can contribute to a significant reduction in construction period and cost.

Next, of the repair method of the reinforced earth wall using the earth retaining jig 1, the procedure up to the earth retaining stage will be described with reference to FIG.
<1> Initial state (FIG. 2 (a))
FIG. 2A is a diagram showing a case where some of the reinforcing materials 2 are dropped out of the wall surface materials 2 constituting the reinforcing earth wall A. FIG.

<2> Excavation and installation of earth retaining jigs (FIGS. 2B and 2C)
As shown in FIG. 2B, a part of the reinforcing material 4 exposed from the embankment 3 is connected to the earth retaining jig 1 while sequentially removing the wall material 2 from the top end side of the reinforcing earth wall A. Go.
At this time, removal of the wall surface material 2 and installation work of the earth retaining jig 1 can be performed from a scaffold (not shown) provided on the front side of the reinforced earth wall A.
The place where the earth retaining jig 1 is installed is simply mountain-capped.
By proceeding downward in this order and installing the earth retaining jigs (1a, 1b,..., 1e) in succession, it can be piled up to the point where the wall material needs to be repaired as shown in FIG. We will secure the state. The temporary mountain retaining surface 5 is formed by the plurality of earth retaining jigs.

  According to the present embodiment, since it is not necessary to arrange heavy machinery when mounting on the mountain, it is possible to work even in a rugged site such as a mountainous area. In addition, the amount of excavation of the embankment can be kept to a minimum. Therefore, it can contribute to a significant reduction in the construction period and cost.

Next, an example of a procedure from the earth retaining stage to the repairing stage in the repair method of the reinforced earth wall using the earth retaining jig 1 will be described with reference to FIG.
<1> Removal of retaining jig / Installation of wall surface material In this example, the lower retaining jig 1e is removed from a state where the retaining jigs 1a to 1e are simply piled, and a new wall surface material 2a is constructed. This is a method of re-filling and repeating them in order.
The new wall material 2 may be precast, or may be constructed on site with a formwork.
The end portion of the reinforcing material 4 removed from the earth retaining jig 1 is integrated with the new wall material 2 again.
As a method for integrating the reinforcing material 4 and the new wall surface material 2, a known method can be adopted.
In addition, when the length of the reinforcing material 4 is insufficient, the length may be appropriately supplemented to ensure integration with the wall surface material 2.

  According to the present embodiment, the earth retaining jig can be reused, which can contribute to shortening the construction cost. Moreover, since the whole work only needs to install the wall surface material and the minimum embankment work, it can contribute to shortening the construction period.

Next, another example of the procedure from the earth retaining stage to the repair stage in the repair method of the reinforced earth wall using the earth retaining jig will be described with reference to FIG.
This example is a method of constructing and refilling a new wall material 2 in a state where the earth retaining jig 1 is buried as it is.
The new wall material 2 may be precast or on-site.
When the new wall surface material 2 is precast, the earth retaining jig 1 and the wall surface material 2 are connected and integrated by a known method.
When the new wall material 2 is on-site, the internal reinforcing bars of the wall material 2 and the earth retaining jig 1 may be connected and integrated by a known method, or a part of the earth retaining jig 1 may be You may forcibly integrate with the wall material 2 by burying it together with mortar hit on the spot.

  According to the present embodiment, it is possible to maintain a state in which the simple retaining wall constructed by the earth retaining jig exists on the back side of the wall surface material, and therefore it is possible to provide a reinforced soil wall having a higher retaining effect.

  In addition, in the above-described repair method, various function addition operations used in repair of a known reinforced earth wall, such as the arrangement of a new drainage material, may be performed as necessary.

DESCRIPTION OF SYMBOLS 1 Earth retaining jig 11 Pressure receiving part 111 Ground surface 112 Through-hole 12 Connection part 121 Insertion space 122 Connection hole 2 Wall material 3 Embankment 31 Exposed surface 4 Reinforcement material 5 Temporary mountain retaining surface A Reinforcement soil wall

Claims (4)

In a reinforced soil wall including at least a wall surface material, a fill provided on a back surface of the wall surface material, and a reinforcing material connected to the wall surface material and disposed inside the embankment, the wall surface material is exposed due to damage or dropping off. A retaining jig for retaining the embankment
A pressure receiving portion placed on the exposed surface of the embankment;
A connecting portion for fixing the reinforcing material exposed from the embankment;
A earth retaining jig comprising at least A method of retaining the reinforced soil wall using the retaining jig according to claim 1,
(A) While removing the wall material to be repaired, excavating a part of the embankment on the back side of the wall material to form an installation space for the earth retaining jig,
(B) installing the earth retaining jig on the exposed surface of the embankment;
(C) fixing the reinforcing material exposed from the embankment with the connecting portion of the earth retaining jig;
(D) The above steps (a) to (c) are sequentially performed for each wall material to be repaired, and a retaining surface is constructed.
An earth retaining method for repairing a reinforced earth wall. A method for repairing a reinforced earth wall using the earth retaining method according to claim 2,
After building the retaining surface by the step (d),
(E1) A method of repairing a reinforced earth wall, wherein a new wall surface material is constructed while removing the earth retaining jig constituting the earth retaining surface in order from the bottom. A method for repairing a reinforced earth wall using the earth retaining method according to claim 2,
After building the retaining surface by the step (d),
(E2) A method for repairing a reinforced earth wall, wherein a new wall surface material is constructed in front of the earth retaining surface while maintaining the earth retaining surface.

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