JP4573964B2 - Retaining wall construction method using blocks - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a retaining wall on a slope by arranging concrete blocks (hereinafter abbreviated as blocks) from the upper side to the lower side, which is the reverse of the normal stacking method.
[0002]
[Prior art]
When building a retaining wall on the slope, a construction method in which blocks are stacked on the foundation has been common. However, in the case of the usual retaining wall construction method in which blocks are piled up in order from the bottom, it is necessary to excavate a large amount of ground, and there is a problem that a scaffold is necessary during construction and overdrilling problems. Yes. In addition, there is a risk of a sediment collapse accident during construction.
[0003]
As a conventional example of a method for constructing a retaining wall using blocks from the upper side to the lower side of the slope, as shown in FIG. 11, when the precast plate 2 is arranged to reinforce the cut slope 1, the upper precast plate is used. Is fixed with a reinforcing material (steel bar, long bolt, etc.) 3 driven into the natural ground, and then the lower part is excavated (a), and the lower precast plate is placed in the excavated part (b), There is a method of constructing a retaining wall from the upper side to the lower side by a series of steps of fixing the lower precast plate with the reinforcing material 3 driven into the natural ground (for example, JP-A-7-34464). Since this construction method does not require extra cutting or backfilling, the amount of earthwork can be reduced, and the amount of excavated soil can be greatly reduced, so that it is possible to maintain the forest and protect the natural environment without damaging the ground. There are features such as.
[0004]
However, in this conventional construction method, it is necessary to fix the upper precast plate to the effective portion of the natural ground with the long reinforcing material 3 prior to the lower excavation after the upper precast plate is arranged. As is obvious from FIGS. 11 (a) to (f), this work is difficult and dangerous. In addition, as shown in FIG. 11 (e), a complicated work of fixing the head of the reinforcing material 3 with a torque wrench or the like and then attaching a cap that hides the head of the reinforcing material 3 is required. For this reason, the overall construction cost is higher than that of the general construction method, which hinders the spread of the construction method.
[0005]
[Problems to be solved by the invention]
Therefore, when building a retaining wall, we examined a retaining wall construction method using blocks that can protect the natural ground and do not require the construction of a scaffold, and can be constructed efficiently.
[0006]
[Means for Solving the Problems]
As a result of examining the above problems, when building a retaining wall on the slope, the excavation slope is formed in steps so that the excavation slope and the unexcavated ground are alternated from the upper part of the slope to the lateral direction of the slope , The lower part of the part where the block is located on the excavation slope in the upper stage is an unexcavated ground, and the upper wall of this unexcavated ground is connected to the retaining wall from above while supporting the retaining wall load during construction. A retaining wall construction method using characteristic blocks was developed.
[0007]
Specifically, when constructing a retaining wall to slope, first, (a) at the top end slopes to form a drilling slopes laterally, the Tentan concrete and block the excavation slopes is below ground Placed to be supported by a mountain, then (b) a drilling slope and an unexcavated method excavated as much as the vertical size of the block laterally with respect to the lower side of the block placed in (a) forming a surface alternately engage the block to the excavation slopes portion blocks arranged block top in said (a) with downwardly arranged to be supported in the natural ground, (c) the ( The unexcavated ground pile left intermittently in b) is excavated to a depth of more than double the longitudinal width of the block, and the lower part of the block is supported by the natural ground on this excavation slope portion. the block upper with placing engaged with blocks arranged in the (b), until the base of this series of steps Each other repeatedly, in the bottom and required width drilling non excavating natural ground to the base to place the bottom block, and a retaining wall construction method using a block, characterized in that the base is provided therebelow.
[0008]
Depending on the mode of use, the block is provided with a reinforcing hole or a crushed stone filling hole that communicates in the longitudinal direction. Furthermore, joints between adjacent blocks on the top, bottom, left and right of the block are provided. Thereby, external pressures such as earth pressure and upper load can be dispersed.
[0009]
Furthermore, by making the vertical or horizontal size of the back of the block smaller than the vertical or horizontal size of the block front, it is possible to cope with a curve in the vertical or horizontal direction.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings. FIGS. 1-6 is a front view of the process of constructing by the retaining wall construction method of the present invention, FIG. 7 is a front view at the time of completion, and FIG. 8 is a central longitudinal sectional view at the time of completion. FIG. 9 is a perspective view of a block used for this construction, and FIG. 10 is a perspective view of another structural example block.
[0011]
As shown in FIG. 1, when constructing the retaining wall, first, a excavation slope is formed in the lateral direction at the top slope, and the block C ₁ group is supported by the natural ground below the excavation slope. The top end concrete (or a top end block) TC is placed on the slope so that the upper part rests on the slope. Since the natural ground B supports from below the block C ₁ group, the block C ₁ and the top concrete do not fall below the slope.
[0012]
In the next step by drilling non excavating natural ground B ₁ as much as the vertical size of the block C ₁ and excavation slopes. A block C ₂ group is placed on the excavated slope (FIG. 2). Since the natural ground is supported from below the block C ₂ group, the block C ₂ does not fall down the slope. Further, the joint 11a vertically and horizontally in block C to be used as seen in FIG. 9, 11b, 12a, generally by these engagement because it has a 12b come together, natural ground is supported from below of the block C ₂ group since it is, and the block C ₁ group be drilled portion of the subsequent step excavation target area B ₂ of the lower block C ₁ group is stable.
[0013]
As shown in FIG. 2, when excavating the area B ₂ to be excavated in the next process, the unexcavated ground that has been left intermittently is excavated more than double the vertical width of the block, To do. Similarly, the next process excavation target area B ₃ to the next process excavation target area B ₅ are sequentially repeated.
The lower part of the area where the block is placed on the excavation slope in the upper stage is an unexcavated ground in the lower stage, and the retaining wall can be constructed from above to below while supporting the retaining wall load during construction on the unexcavated ground. It can be done (FIGS. 3 to 5).
[0014]
In retaining wall construction method using this block are alternately repeated series of steps up to the base D, and the bottom block by drilling the non-drilling natural ground B ₆ only required widths up base in the bottom of FIG. 6 The base D is finally formed below it.
[0015]
In the block of each block C, a bar arrangement hole 15 is provided in the vertical direction so as to communicate between the upper and lower blocks. A reinforcing bar 14 is laid from a reinforcing bar 13 provided in the upper top concrete (or a top block) and fixed to the base D. In addition, an L-shaped top end block in which the top end concrete and the block C ₁ are integrated may be used for the uppermost stage, and the reinforcing bars are arranged downward from the reinforcing bar provided in the upper part and sheared. It is possible to enhance the resistance.
[0016]
Further, a crushed stone filling hole 16 is provided in the block C of each block C. The crushed stone filling hole 16 is also provided in communication between the upper and lower blocks. For this reason, the backside crushed stone is not required on the back of the retaining wall.
[0017]
In the example shown in FIG. 9 (a), in addition to the joints 11a and 11b having an upward projecting shape and a recessed groove on the lower side, joints 12a and 12a projecting to the left and right are provided. Therefore, in order to obtain a structure in which the entire surface is connected, as shown in FIG. 9 (b), in addition to the joints 11a and 11b having a protruding top and a concave groove on the bottom, It is necessary to use a block having a structure having concave groove (groove) joints 12b, 12b on the left and right.
[0018]
In the example of FIG. 10, the joints (protruded joints) 11a and 12b protrude from the upper and right sides of the drawing, and the concave and concave joints (recessed groove) joints 11b and 12a are provided at the lower and left joints. In addition, since these are provided a little from the front surface (icicle), the appearance after construction is good because only the joints can be seen. In particular, when a pattern such as a pseudo stone pattern is formed on the front surface, the environment is considered. Moreover, construction is possible with one type of block.
[0019]
Although not shown in the figure, the horizontal (or vertical) curved surface is made smaller by making the horizontal (or vertical) size of the back of the block smaller than the horizontal (or vertical) size of the front of the block. Construction is now possible.
[0020]
【The invention's effect】
The present invention is a retaining wall construction method as detailed above, and has the following features.
(1) Excessive excavation of the slope can be minimized.
(2) Integration and prevention of slippage are possible by arranging steel bars and mortar in the girder direction.
(3) The external pressure can be dispersed by connecting the top, bottom, left and right of the block.
(4) Since it can be constructed in parallel with the cut, safe construction is possible.
(5) Since the block contains crushed stone for drainage, no back crushed crushed stone is required.
(6) Good construction is possible even for curved surfaces (curves).
[Brief description of the drawings]
FIG. 1 is a front view of a process in which a retaining wall construction method according to the present invention is applied.
FIG. 2 is a front view of the construction process.
FIG. 3 is a front view of the construction process.
FIG. 4 is a front view of the construction process.
FIG. 5 is a front view of the construction process.
FIG. 6 is a front view of the construction process.
FIG. 7 is a front view of the retaining wall when completed.
FIG. 8 is a central longitudinal cross-sectional side view of the retaining wall when completed.
FIGS. 9A and 9B are perspective views of blocks used for construction.
FIG. 10 is a perspective view of another structural example block;
FIGS. 11A to 11F are side views of a conventional example in which a retaining wall is constructed using blocks from the upper side to the lower side of the slope.
[Explanation of symbols]
1 Cut slope 2 Precast plate 3 Reinforcement material (steel bar, long bolt, etc.)
11a, 11b fitting
12a, 12b fitting
13 Reinforcing bar
14 Rebar
15 Reinforcing bar
16 Crushed stone filling hole B Unexcavated ground C Block D Foundation
TC top concrete

Claims (4)

When constructing the retaining wall on the slope, first, (a) the excavation slope is formed in the lateral direction on the top slope, and the top concrete and block are supported by the natural ground below the excavation slope. Next, (b) alternately formed excavation slopes and unexcavation slopes excavated as much as the vertical size of the blocks in the lateral direction with respect to the lower side of the blocks arranged in (a) Then, the block is placed on the slope of the excavation so that the lower part is supported by the natural ground, and the upper part of the block is engaged with the block arranged in (a), and (c) intermittent in (b). The remaining unexcavated ground is excavated more than double the longitudinal width of the block to form a drilling slope, and the block is placed on this drilling slope so that the lower part is supported by the ground and the upper part of the block Is engaged with the block arranged in (b) above, and this series of steps is repeated alternately up to the base. In the bottom with necessary width drilling non excavating natural ground to the base to place the bottom block, retaining wall construction method using a block, characterized in that the base is provided therebelow. Retaining wall construction method using the reinforcement holes or blocks according to claim 1, wherein providing the crushed stone fill hole communicating longitudinally ahead of the block. The retaining wall construction method using a block according to claim 1 or 2 , wherein joints are provided on the top, bottom, left and right of the block. The method for constructing a retaining wall using a block according to any one of claims 1 to 3 , wherein the vertical or horizontal size of the block back surface is smaller than the vertical or horizontal size of the block front surface.

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