JP2724734B2 - Concrete block and retaining wall construction method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a concrete block suitable for use in retaining wall construction and the like, and a retaining wall construction method using the concrete block.

(Conventional technology) Conventionally, retaining wall construction and earth retaining work according to a predetermined slope are performed by pouring ready-mixed concrete between formwork,
A method is known in which after carrying out concrete foundation work or rock laminating work, concrete blocks having protrusions on the back surface are sequentially stacked, and a backing material such as glue stone and ready-mixed concrete are poured on the back surface, and the like is performed. .

(Problems to be Solved by the Invention) However, such a conventional method requires a large amount of labor and days, and requires a considerable amount of ready-mixed concrete, and thus has a problem that the construction cost is relatively high. . In addition, according to the conventional concrete wall, if the rainwater or the like falls a lot, the soil on the land will contain a lot of water and will be easily damaged by the collapse of sediment. There was also a problem that it had to be done.

The present invention has been made to solve such problems.

(Means for Solving the Problems) A concrete block according to the present invention includes a concrete frame having an opening in the center and formed in a square shape,
A ready-mixed concrete injection groove provided in the center of the outer peripheral edge of the concrete frame, a tapered notch provided on the surface and back surface near the four corners of the outer peripheral surface of the concrete frame,
A reinforcing bar extending diagonally from the opening of the concrete frame so as to face the injection groove, and a synthetic resin fixed to a buried side of the reinforcing bar inserted through the opening of the concrete frame. And a net.

Further, in the retaining wall construction method using a concrete block according to the present invention, concrete blocks are sequentially stacked so that the concrete block net according to claim 1 is arranged on a buried side, and the adjacent concrete blocks are injected. A concrete pouring hole is formed with the grooves facing each other, and the reinforcing bars of adjacent concrete blocks are welded and fixed integrally, and then the pouring hole is filled with ready-mixed concrete.

(Operation) In this manner, a reinforcing bar is extended diagonally from the opening of the rectangular concrete frame body having the opening formed in the center and is combined with the embankment side of the reinforcing bar inserted through the opening. The net made of resin is fixed to reduce the weight of the entire concrete block, and drainage of rainwater or the like on the buried side from the net. Further, the rebar and the net receive the earth pressure from the buried side.

In addition, when concrete blocks are stacked, the reinforcing bars that extend diagonally from the opening of the concrete frame and face the fresh concrete injection groove, and the reinforcing bars between adjacent concrete frames are fixed by welding. Are fixed together.

Further, the ready-mixed concrete pouring holes formed in the center of the outer peripheral edge of the laminated concrete block with the ready-mixed concrete pouring grooves facing each other are filled with ready-mixed concrete. Then, tapered cutout grooves for inserting a positioning lever or the like at the time of laminating work are provided on the surface and the back surface near the four corners of the outer peripheral surface of the concrete frame.

In addition, by stacking concrete blocks that can be mass-produced as described above and welding the adjacent reinforcing bars, filling the injection holes with fresh concrete makes it possible to obtain a concrete retaining wall with strong reinforcing bars in a short period of time. It becomes possible.

(Example) Hereinafter, one example of a concrete block according to the present invention will be described with reference to the drawings. FIG. 1 is a front view of a concrete block as viewed from a buried side, and FIG. 2 is a sectional view taken along the line II-II in FIG.

1 and 2, reference numeral 1 denotes a concrete block according to the present invention, in which a concrete frame 3 having an opening 2 in the center is formed in a square shape. It is preferable that the external dimensions of the concrete frame 3 be standard dimensions such as (1000 × 1000 mm). Opening 2
Is formed in a tapered shape inward from both sides of the concrete block 1 as shown in FIG. 2, and the opening edge on the surface (right side in FIG. 2) of the concrete block 1 is formed in a curved line shape. .

The entire outer circumference (four circumferences) of the concrete frame 3 is a flat portion 3a.
Then, a ready-mixed concrete injection groove 3b is formed at the center. When the concrete blocks 1 are sequentially stacked, the injection groove 3b is formed by an injection groove of each adjacent concrete block.
3b, 3b are opposed to each other to form a ready-mixed concrete pouring hole 4 for connecting concrete blocks. Reference numerals 5 and 5 denote notched grooves formed in the vicinity of the four corners of the outer peripheral surface of the concrete block 1, which are provided on the front surface and the back surface of the concrete block 1, respectively. The notch groove 5 is used for performing fine positioning by inserting a metal iron, a wedge, or the like when the concrete block 1 is laminated. Reference numerals 6 and 6 denote rebars located at the center of the concrete frame 3 and extending diagonally from the opening 2 and facing the injection groove 3b. The reinforcing bars 6 extend slightly longer than the diagonal dimension of the concrete frame 3 so that when the concrete blocks 1 are sequentially stacked, the reinforcing bars of the adjacent concrete blocks 1 can be welded. Then, the adjacent concrete blocks are integrally fixed by welding the reinforcing bars 6.

The buried side (left side in FIG. 2) of the reinforcing bar 6 inserted through the opening 2 of the concrete frame 3 is made of a synthetic resin for avoiding the generation of rust and the like even in soil with much moisture. The net 7 is fixed by appropriate means. This net 7
It has appropriate strength and durability.

Next, a concrete block used for a corner portion or the like when the concrete blocks according to the present invention are laminated will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a front view of a concrete block (hereinafter referred to as a “triangular block”) having a right-angled isosceles triangle shape, and FIG. 4 is a right side view of FIG.

3 and 4, reference numeral 8 denotes a triangular block. Its external shape is the concrete block 1 according to the present invention.
Is divided into two in the diagonal direction to form a right-angled isosceles triangle. A flat portion 8a and a fresh concrete pouring groove 8b provided at the center thereof are formed on the outer peripheral surface of the isosceles which is the short side of the triangular block 8, and the long side is a flat portion 8c.

Reference numeral 9 denotes a reinforcing bar buried in the center of the triangular block 8, one end of which faces the injection groove 8b at the top, and the other end slightly protrudes from the long-side flat portion 8c. In addition, it is preferable that both ends of the reinforcing steel bar 9 be a suspension ring portion 9a so as to be easily slung by a crane.

A method for constructing a concrete retaining wall using the concrete block 1 and the triangular block 8 thus formed will be described with reference to FIG. 5 to FIG. 5 to 9 are explanatory views for explaining the progress of the retaining wall construction, FIG. 10 is an arrow view as viewed from the direction of line XX in FIG. 6, and FIG. 11 is a portion C in FIG. FIG.

First, in FIG. 5, the foundation portion for performing the retaining wall construction is leveled, and a leveled foundation A is constructed with discarded concrete or the like. Next, the concrete block 1a is suspended on a slinging tool 11 attached to a hook 10 such as a crane so that the net 7 of the concrete block according to the present invention is disposed on the buried side (ground side). At a predetermined position (No. 5)
See figure).

Next, the next concrete block 1b is placed on the foundation A adjacent to the concrete block 1a. At this time, the respective injection grooves 3b, 3b formed on the outer peripheral side surfaces of the concrete blocks 1a, 1b are inserted. A vertical pouring hole 4a for pouring ready-mixed concrete is formed between the concrete blocks so as to face each other. At this time, a slight bending process is performed so that the reinforcing bars 6a and 6b provided in the diagonal direction of the concrete block 1 do not interfere with each other (see FIGS. 6 to 10).

Next, in the same way, concrete blocks 1, 1 ...
The first concrete blocks are sequentially placed on the foundation A in the horizontal direction while forming the vertical injection holes 4a, 4a,. And the foundation A is adjacent to the concrete block 1c at the end.
The triangular block 8 is placed on the upper part. At this time, the same vertical injection hole 4a is formed by making the injection groove 3b of the concrete block 1c and the injection groove 8b of the triangular block 8 face each other (see FIG. 7).

Subsequently, the second-stage concrete block is placed on the first-stage concrete block. At this time, the injection grooves 3b, 3b formed on the upper and lower outer peripheral surfaces of the first-stage and second-stage concrete blocks are provided. Are opposed to each other to form a horizontal injection hole 4b for injecting ready-mixed concrete between the concrete blocks. At this time, the fine positioning of the second stage concrete block is performed by inserting a lever or the like into the tapered notch groove 5 provided in the concrete block (see FIG. 7).

In this state, the reinforcing bars 6a, 6b of the first-stage concrete blocks 1a, 1b adjacent to each other and the reinforcing bars 6d of the second-stage concrete block 1d are welded, and the concrete blocks are integrally and firmly fixed. (See FIG. 11).

In the same manner, the stacking work is performed up to the final step while sequentially fixing the second concrete block on the first concrete block (see FIG. 8).

Then, the ready-mixed concrete 12 is injected from the vertical injection holes 4a between the concrete blocks in the final stage. At this time, the horizontal injection holes 4b, 4b,.
Fresh concrete 12 is filled. If necessary, insert reinforcing steel into the vertical injection holes 4a and the horizontal injection holes 4b to
Of course.

Lastly, buried B is applied to the back of the concrete retaining wall and the foundation, and unnecessary reinforcing bars are removed to complete the retaining wall construction (No. 9
See figure).

Next, another laminating method will be described with reference to FIGS. FIG. 12 to FIG. 14 are explanatory views illustrating the progress of the retaining wall construction. The description of the same elements as those in FIGS. 5 to 9 will be omitted.

At the predetermined position of the foundation A, the long side flat portion 8c of the triangular block 8
With the triangle facing down, the first horizontal triangle block 8,
8 are placed (see Fig. 12).

Next, the concrete block 1 according to the present invention is placed between the triangular blocks 8,8. At this time, the injection groove 8b formed in the triangular block 8 and the concrete block 1
An injection hole 4 for injecting ready-mixed concrete is formed between the triangular block 8 and the concrete block 1 with the injection groove 3b formed on the outer peripheral side of the concrete block opposing.

Then, the reinforcing bar 9 of the adjacent triangular block 8 and the reinforcing bars 6, 6 of the concrete block 1 are welded.

After the stacking work is performed to the required number in the same manner, the final stage work is performed with the long side flat portion 8c of the triangular block 8 facing upward (see FIG. 13).

Then, the ready-mixed concrete 12 from the injection holes 4, 4 ... of the last stage
Inject.

Finally, bury soil B on the back and the foundation of the concrete retaining wall, remove unnecessary reinforcing bars, etc., and complete the retaining wall construction (No. 14
See figure).

(Effects of the Invention) Since the present invention is configured as described above in detail, it has the following effects.

The concrete block itself can be mass-produced at the factory, and the on-site work will be significantly reduced compared to the past, and the concrete retaining wall with steel bars can be done without a formwork, thus significantly shortening the construction period. Can be done.

The backing material on the back side of the concrete block is not required, and there is no waste in the injection amount of the ready-mixed concrete after the final block is stacked, so that the construction cost can be reduced. In addition, since the opening is provided at the center of the concrete frame and the net made of synthetic resin is fixed to the opening, the weight of the entire concrete block can be reduced.

Furthermore, since a tapered notch groove is provided on the surface and the back surface in the vicinity of the four corners of the outer peripheral surface of the concrete frame body, by inserting a metal lever, a wedge, or the like into this notch groove, a minute amount when performing laminating work is provided. Positioning can be performed easily,
Enforceability is improved.

Since the synthetic resin net is fixed to the opening of the concrete frame, it is possible to avoid the occurrence of rust and the like even in soil with much moisture, and it is possible to sufficiently secure the required strength and durability. At the same time, rapid natural drainage of rainwater and the like becomes possible, and it is possible to prevent occurrence of disasters due to collapse of earth and sand.

[Brief description of the drawings]

FIG. 1 is a front view of a concrete block viewed from a buried side, FIG. 2 is a sectional view taken along the line II-II in FIG.
Fig. 4 is a front view of the triangular block, Fig. 4 is a right side view of Fig. 3, Figs. 5 to 9 are explanatory views for explaining the progress of retaining wall construction, and Fig. 10 is X in Fig. 6. 11 is an X-ray arrow view, FIG. 11 is a detailed view of a portion C in FIG. 7, and FIGS. 12 to 14 are explanatory views for explaining the progress of another retaining wall construction. 1 ... concrete block 3 ... concrete frame 3b ... fresh concrete injection groove 4 ... fresh concrete injection hole 6 ... rebar 7 ... net

Claims (2)

(57) [Claims] 1. A concrete frame having a square shape with an opening at the center, a ready-mixed concrete injection groove provided at the center of the outer peripheral edge of the concrete frame, and four corners of the outer peripheral surface of the concrete frame. A tapered notch groove provided on the surface and the back surface of the vicinity portion, a reinforcing bar extending diagonally from the opening of the concrete frame and facing the injection groove, and the reinforcing bar of the concrete frame. A concrete block, comprising: a synthetic resin net fixed to a buried side of a reinforcing bar passing through an opening. 2. The concrete block net according to claim 1, wherein the concrete blocks are sequentially laminated so as to be arranged on a buried side, and concrete injection holes are formed by opposing injection grooves of adjacent concrete blocks. A method of retaining wall construction using a concrete block, characterized in that the reinforcing bars of adjacent concrete blocks are welded and fixed together, and then the injection hole is filled with fresh concrete.