JPH0718687A - Retaining wall construction method - Google Patents

Abstract

PURPOSE:To dispense with cast-in-place concrete other than foundation concrete and easily and safely perform the field work by preparing a plurality of box type retaining blocks different in depth size at a factory or the like in advance. CONSTITUTION:Foundation concrete 7 is cast in place at a position where a building lot or a debris dam is to be constructed, for example. Box type retaining blocks 1 are vertically stacked into a stairway shape on the outside so that those with a large depth are located below and those with a small depth are located above, and they are connected in parallel in the horizontal direction. Hereupon, cranes are used, for example. The box type retaining wall blocks 1 have partition plates 4, however they have no ceiling and no bottom section and are hollow, thus reinforcing bars are vertically inserted into them. Concrete is filled in the box type retaining wall blocks 1 to bury the reinforcing bars.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a retaining wall for river bank construction, residential land construction, water storage dam, weir construction of erosion control dam, and the like.

[0002]

2. Description of the Related Art Conventionally, there is no need to assemble a scaffold for work for assembling a formwork, and a concrete block is piled up on the rear side of a rectangular base body which eliminates the danger to the operator. A front wall and a rear wall are formed by stacking a large number of legged blocks formed by projecting two legs in a zigzag manner and stacking them so that the legs of the upper and lower legged blocks overlap each other. At the same time, the front wall and the rear wall are connected by a suitable number of intermediate vertical walls formed by joining a number of stacked tubular blocks with concrete, while the remaining space between the front wall and the rear wall is There is known a method of constructing a dam-like structure in which a filling material made of poorly mixed concrete or crushed stone is filled in the space (see Japanese Patent Publication No. 56-11812).

[0003]

However, in the above-mentioned prior art, since the dam-shaped structure is constructed by the legged block and the tubular block, the legged block and the tubular block must be joined with concrete. In addition, there is a problem that it is necessary to have a complicated shape leg block, such as making a step on the front and rear of the base of the leg block, forming a flat surface and a tapered surface in order to easily stack it. There was a problem that became. In view of these circumstances, the present invention eliminates the above-mentioned drawbacks of the prior art, and with a simple configuration, it is not necessary to prepare two types of blocks, a legged block and a tubular block, and join them with concrete. Using a box type retaining wall block, the longitudinal direction was connected by reinforcing bars, and the depth was gradually reduced as going up to form a staircase, but the inner side (mountain side) was vertically installed so that it was stacked directly. It is an object of the present invention to provide a method for constructing a retaining wall that is stacked so that the amount of backfilling can be reduced by forming a staircase on the outside.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and in the method of constructing a retaining wall, a box type retaining wall block having no ceiling or bottom is used to partition both side walls and an intermediate part A hollow part surrounded by a wall is provided, an intermediate partition plate is provided in a direction perpendicular to the side wall and the intermediate partition wall, and a plurality of types of this box type retaining wall block with different depth dimensions are prepared. The type retaining wall blocks are stacked so that the one with the larger depth is at the bottom and the one with the smaller depth is stacked vertically so that the inner side is vertical and the outer side is stepwise. ceiling,
We adopted the technical means of inserting the rebar using the part without the bottom, connecting the vertical direction of the box type retaining wall block with the rebar, and filling with concrete to fill these vertical rebars. .

[0005]

As a result of adopting the above technical means, the present invention has a simple structure, does not require on-site casting with a formwork, can be manufactured in a factory, can be loaded on a crane at the site, and has a longitudinal reinforcing bar. It can be connected and integrated by using. Also, as the earth pressure decreases toward the top, the retaining wall concrete block can be made smaller, so the cost can be reduced, and the one with a smaller weight can be used as the height increases, so the work is easier. Become. Therefore, the work can be safely and easily proceeded without danger. Further, since the outer side is stepped, it is possible to directly judge the opening width, and when the excavation amount is the same, the backfill amount can be reduced and the construction cost can be reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a plan view of a box type retaining wall block according to the first embodiment of the present invention. Reference numeral 1 is a box-type retaining wall block composed of a front wall, a rear wall, and left and right side walls, and a middle partition wall 2 is formed in the middle portion. Then, in order to prevent concrete from entering the planting side, an engaging groove 8 is provided in a substantially middle portion so as to intersect with the middle partition wall 2 and the left and right side walls 3, and the middle partition plate 4 is provided in the engaging groove 8. There is. Further, positioning concave and convex portions 5 are formed on the upper and lower sides of the middle partition wall 2 and the left and right side walls 3 toward the front. Needless to say, a drainage hole and a suspender for suspending the box-type retaining wall block 1 with a crane or the like are provided. Reference numeral 6 is a hollow portion partitioned by the partition wall 2. The box type retaining wall block 1 is prepared in several types having different depth dimensions. This is a similar shape except that the dimensions of the concave and convex portions of the middle partition wall 2, the left and right side walls 3, and the dimensions of the hollow portion 6 are determined in accordance with the depth dimension due to the different depth dimensions.

Next, the method of the present invention for constructing a retaining wall such as a dam using the box type retaining wall block 1 shown in FIG. 1 will be described in detail with reference to FIG. First,
First, after excavating the ground to an appropriate depth at the place where the dam should be constructed, the foundation concrete 7 is cast in situ. Then, the required height and length are stacked on the basic concrete 7. In this, the box-type retaining wall blocks 1 having the largest depth dimension are stacked vertically and horizontally by an appropriate number of steps (three steps in this embodiment) corresponding to the required height and length. By utilizing the hollow portions 6 of the box-type retaining wall blocks 1 which are stacked and arranged in parallel, vertical reinforcing bars are planted so as to be integrated from the basic concrete 7 for vertical connection and fixation. Next, the box type retaining wall blocks 1 having a medium depth dimension are stacked in an appropriate number of steps, and the vertical reinforcing bars are similarly planted and connected and fixed. Further, the box type retaining wall block 1 having the smallest depth dimension is similarly piled up in an appropriate number of steps, and the vertical reinforcing bars are planted side by side and connected and fixed to construct the retaining wall of the dam. When stacking this
The inner side (mountain side) will be installed vertically so that it is vertically stacked. Therefore, the outside is stepped.

By constructing in this way, when the amount of excavation is the same, the backfill amount is smaller and the construction cost is lower than the conventional one in which the inner side (mountain side) is stepped. is there. For this reason, as shown in the figure, it is stepped from the lower side to the upper side. Therefore, since the work can be performed firmly and using the stepped portion,
The work can be performed extremely safely, and since the concrete block for the retaining wall having a smaller depth toward the upper part can be used, the overall cost can be reduced.
Further, by providing a plurality of middle partition walls 2 as another embodiment, it is possible to increase the number of hollow portions 6 and at the same time reduce the thickness of the middle partition wall 2. As an effect of this, it is possible to appropriately fill the earth and sand without filling the entire hollow portion 6 with concrete. Furthermore, since the exterior is constructed so as to be stepped, it is possible to plant using the open space on the front. In addition, an appropriate means for partitioning the partition plate 4 so as to partition the partition wall 2 and the left and right side walls 3 at right angles,
For example, by providing the engaging groove 8 in the middle partition wall 2 and the left and right side walls 3, and by providing the middle partition plate 4 through the engaging groove 8, it is possible to prevent concrete from entering the planting side, and yet to prevent the entire concrete from entering. Will also serve as a reinforcement.

[0009]

As a result of adopting the above configuration, the present invention provides
The following effects can be obtained. (1) Except for foundation concrete, it is not necessary to cast in-situ, box type retaining wall block can be produced in the factory, and
Crane loading is possible. (2) Since the outer side is stepped, it is possible to plant by utilizing the opening width of the front side, and the backfill amount is small for the same excavation amount. (3) The depth dimension becomes smaller as it goes up in the vertical direction, so that a stepped portion is formed as a result, and the work can be safely carried out using this stepped portion. . (4) As the load of earth pressure is reduced, the depth of the upper concrete block for the retaining wall is made smaller, so that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing a box type retaining wall block according to a first embodiment of the present invention.

FIG. 2 is a schematic side view showing a state in which the box type retaining wall blocks in the above embodiment are stacked to form a retaining wall.

[Explanation of symbols]

 1 ... Box type retaining wall block 2 ... Middle partition wall 3 ... Side wall 4 ... Middle partition plate 5 ... Positioning uneven part 6 ... Hollow part 7 ... Basic concrete 8 ... Engaging groove

Claims (1)

[Claims] 1. A box-type retaining wall block having no ceiling or bottom, wherein a hollow portion surrounded by both side walls and an intermediate partition wall is provided, and an intermediate partition plate is formed at a right angle to the side wall and the intermediate partition wall. We have prepared several types of box type retaining wall blocks with different depth dimensions, and make these box type retaining wall blocks the one with the large depth at the bottom,
The smaller depths are stacked vertically so that the inner side is vertical and the outer side is stepped, and at the same time, they are connected in parallel in the horizontal direction, and the reinforcing bars are inserted vertically using the ceiling and the bottomless part. A method of constructing a retaining wall, characterized in that the box-type retaining wall blocks are connected in the vertical direction with reinforcing bars, and are filled with concrete to fill these vertical reinforcing bars.