JP2013217043A - Earth retaining structure of reinforcement soil wall and repair method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth retaining structure of a reinforcement soil wall, capable of reducing a construction period and a construction cost lower than the conventional method, and a repair method for the same.SOLUTION: A reinforcement soil wall includes at least a wall surface material, a banking provided on the back face of the wall surface material, and a reinforcement material connecting with the wall surface material and arranged in the inside of the banking. An earth retaining structure retains the banking exposed to a space formed by excavating a part of the banking on the back face side of the wall surface material, which is a repair object, while leaving the reinforcement material. The earth retaining structure comprises at least an earth retaining fixture installed on a surface of the exposed banking, an attitude retainer which is installed behind the earth retaining fixture and through which the reinforcement material is inserted, and a fastener installed behind the attitude retainer and positioning the reinforcement material.

Description

  The present invention relates to a soil retaining structure for retaining a place where a wall material has fallen off due to deformation of a reinforcing soil wall, and a technique related to a repair method for the reinforcing soil wall.

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 fastening (Figure 3 (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. 3 (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. 3 (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.
(3) Problem of construction cost Although the cost of construction can be reduced if existing reinforcements can be used as they are, it is possible to reconstruct new reinforcements in the excavation space for large-scale repairs. It is considered essential, and no technology has been proposed for utilizing existing reinforcing materials as they are.

  Therefore, an object of this invention is to provide the earth retaining structure and repair method of the reinforced earth wall which can reduce a construction period and a construction cost rather than a conventional construction method.

  The 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. A soil retaining structure for excavating a part of the embankment on the back side of the wall material while leaving a reinforcing material, and retaining the embankment exposed in the excavated space, and installed on the surface of the exposed embankment A jig, a posture holder that is installed behind the earth retaining jig, and the reinforcing material is inserted into the jig, and a fixture that is installed behind the posture holder and positions the reinforcing material. Provided is a reinforced earth wall retaining structure characterized by comprising at least.

  Further, the second invention of the present application is a method for repairing a reinforced soil wall including at least a wall surface material, embankment 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. And (a) excavating a portion of the embankment on the back side of the wall surface material while removing the wall material to be repaired while leaving the reinforcing material to form an excavation space; (b) the excavation The embankment surface exposed in the space is earthed, (c) the remaining reinforcing material is positioned so as to maintain the state laid in a substantially horizontal direction, and (d) the steps (a) to (c) are repaired. Go to the target wall material one by one to construct a temporary mountain retaining surface. (E) While removing the earth retaining jig, the posture holder and the wall surface connector in order from the bottom, construct a new wall material and embankment. A method for repairing a reinforced earth wall is provided.

According to the present invention, at least one of the effects described below can be obtained.
(1) Since retaining the soil step by step, it is not necessary to arrange long piles such as steel sheet piles, main piles, and horizontal sheet piles at the time of mountain fastening, and a large-scale temporary construction for stocking those materials There is no need to secure a 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) Since it is not necessary to arrange heavy machinery during mountain mounting, it is possible to work even in rugged sites such as mountainous areas.
(3) Since existing reinforcing materials can be used as they are, there is no need to re-install new reinforcing materials, which contributes to a reduction in construction period and cost.
(4) Since the state in which the reinforcing material is laid substantially horizontally in the excavation space can be maintained, the connection work with the refilling and a new wall surface material does not become complicated.
(5) Since the repair work requires only the construction work of a new wall material and the minimum embankment work, it contributes to shortening the construction period.
(6) Since the state where the simple retaining wall constructed by the retaining jig exists on the back side of the wall material can be maintained, provision of a reinforced soil wall having a higher retaining effect can be expected.

Schematic of the earth retaining structure concerning this invention. The figure which shows the repair method of the reinforced earth wall which concerns on this invention. The figure 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.

[Presupposed reinforced earth wall]
The reinforced soil wall presupposed by the present invention includes a wall surface material A, a bank B provided on the back surface of the wall surface material A, a reinforcing material C connected to the wall surface material C and disposed inside the bank B. , At least a retaining structure.
The reinforced earth wall is not limited to a straight wall, and may be provided with a slope.

<1> Overall Configuration FIG. 1 is a diagram illustrating a soil retaining structure of a reinforced soil wall according to the present invention.
The earth retaining structure of the reinforced earth wall according to the present invention is provided in a space (hereinafter, “excavation space D”) where a part of the embankment B on the back side of the wall surface material A to be repaired is excavated.
The earth retaining structure of the reinforced earth wall according to the present invention includes an earth retaining jig 1, an attitude holder 2 disposed behind the earth retaining jig 1, a wall surface connector 3 disposed behind the attitude holder 2, At least.
Hereinafter, each member will be described.

<2> Earth retaining jig The earth retaining jig 1 is a member for retaining the exposed bank B in the excavation space D.
The earth retaining jig 1 according to the present invention includes at least a pressure receiving portion 11 placed in contact with an exposed surface of the embankment and a connecting portion 12 that fixes the reinforcing material C exposed from the embankment B.

<2.1> 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 C.

<2.2> Connecting part The connecting part 12 is a member for connecting and fixing the reinforcing material C.
The connecting portion 12 can be a cylindrical member having an insertion space 121 for inserting the exposed reinforcing material C. 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, and the reinforcing member 4 inserted into the insertion space 121 is configured to be freely fixed by known fixing means such as a bolt.

<3> Posture Holder The posture holder 2 is a member for maintaining the state where the reinforcing material C is laid in the horizontal direction on the excavation space D.
The posture holder 2 can be a tubular member through which the reinforcing material C can be inserted.
The posture holder 2 can also be provided with a slit in the longitudinal direction. In this case, even if the fixture 3 and the reinforcing material C are fixed, the posture holder 2 can be detached from the reinforcing material C through the slit.

<4> Fixing tool The fixing tool 3 is a member for connecting the reinforcing material C and the new wall surface material A.
The fixture 3 can be a pair of upper and lower angle members. The angle member is provided with bolt holes 31 penetrating vertically.
The fixture 3 is arranged so that the reinforcing material C exposed from the posture holder 2 is sandwiched between the angle members from above and below, and fastened with bolts to position the reinforcing material C.
At this time, when the reinforcing member C is fixed to the fixture 3, the connection hole C <b> 1 provided in advance for connection with the wall surface material A can also be used as a bolt fastening hole.
The fixing tool 3 passes through the posture holding tool 2 and the earth retaining jig 1 by the pulling resistance of the existing reinforcing material C against the earth pressure acting on the surface (temporary mountain retaining face) retained by the earth retaining jig 1. It also has the effect of complementing the earth retaining effect.

<5> Repair method of reinforced earth wall Next, the repair method of the reinforced earth wall which employ | adopted the said earth retaining structure is demonstrated.

(1) Initial state The reinforced soil wall shown in FIG. 2 (a) is a state in which a part of the reinforcing material A is dropped out of the wall surface material A constituting the reinforced soil wall. Repair work is started from this state.

(2) Construction of temporary earth retaining surface (2.1) Excavation process (Fig. 2 (b))
First, while removing the wall surface material 2 from the top end side of the reinforced soil wall, the embankment existing on the back surface of the removed wall surface material is excavated. At this time, the reinforcing material C in the embankment B is left.

(2.2) Arrangement of earth retaining jig (Fig. 2 (b))
Next, the earth retaining jig 1 is passed through the reinforcing material C exposed from the embankment B and disposed on the surface of the embankment B. Then, the earth retaining jig 1 and the reinforcing material C are fixed by a known method.
At this point, the place where the earth retaining jig 1 is installed is simply mountain-capped.

(2.3) Arrangement of posture holder (FIG. 2 (b))
Next, the posture holder 2 is prepared behind the earth retaining jig 1, and the reinforcing material C exposed from the earth retaining jig 1 is passed through the posture holder 2.
At this time, the reinforcing material C is maintained in a state of being laid substantially horizontally in the excavation space D by the posture holder 2.

(2.4) Arrangement of fixtures (FIG. 2 (b))
Finally, a fixture 3 is prepared behind the posture holder 2, and the reinforcing material C exposed from the posture holder 2 is fixed and positioned.

(2.5) Formation of temporary mountain surface (FIG. 2 (c))
By proceeding the steps (2.1) to (2.4) in order downward, the state where the wall material is fixed to a place where repair of the wall surface material is required and the reinforcing material C floats as if in the excavation space D. To maintain the laid state. The temporary mountain retaining surface E is formed by the plurality of earth retaining jigs.

(3) Construction of a new reinforced earth wall (Fig. 2 (d))
Remove the fixture 3, posture retainer 2 and earthing jig 1 in order while repairing the reinforced earth wall while installing a new wall material and embankment from a state where the earthing jig is simply piled up. Go.
As described above, the reinforcing material C is in the shape of the excavation space D and maintains the state where the embankment remains so that the embankment remains, so that the embedding work and the connection work with the new wall surface material A do not become complicated.

[Other Examples]
In the present invention, a new reinforced earth wall may be constructed with at least one of the fixture 3, the posture holder 2 and the retaining jig 1 remaining.
For example, in the case where a new wall material is formed from cast-in-place concrete, the fixture can be formed so as to be integrated with the new wall material.
Further, if the earth retaining jig 1 remains, the state where the simple retaining wall constructed by the earth retaining jig 1 can be maintained, so that a reinforced earth wall having a higher retaining effect can be expected.
Moreover, you may install a water permeable layer separately at the time of installation of new wall material, and embankment.

DESCRIPTION OF SYMBOLS 1 Earth retaining jig 11 Pressure receiving part 12 Connection part 2 Posture holder 3 Fixing tool A Wall surface material B Embankment C Reinforcement material D Excavation space E Temporary mountain surface

Claims (2)

In the reinforced soil wall including at least a wall surface material, a fill provided on a back surface of the wall material, and a reinforcing material connected to the wall material and disposed inside the fill material, the back side of the wall material to be repaired A retaining structure for excavating a part of the material while leaving the reinforcing material, and retaining the embankment exposed in the excavated space,
An earth retaining jig installed on the exposed surface of the embankment;
A posture holder that is installed behind the earth retaining jig and inserts the reinforcing material therein,
A fixture that is positioned behind the posture retainer and positions the reinforcement;
The earth retaining structure of the reinforced earth wall characterized by comprising at least. A method for repairing a reinforced soil wall comprising 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,
(A) While removing the wall material to be repaired, excavating a part of the embankment on the back side of the wall material while leaving the reinforcing material, forming a drilling space;
(B) retaining the embankment surface exposed in the excavation space;
(C) positioning to maintain the state in which the remaining reinforcing material is laid in a substantially horizontal direction;
(D) The steps (a) to (c) are sequentially performed for each wall material to be repaired to construct a temporary mountain surface,
(E) While removing the earth retaining jig, the posture holder and the wall surface connector in order from the bottom, constructing and embedding a new wall surface material,
A method for repairing a reinforced earth wall.

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