JPH0611980B2 - Construction method of revetment using natural stone - Google Patents

Description

[Detailed Description of the Invention] << Industrial application field >> The present invention relates to an improvement in a construction method of a revetment in which natural stones are laid on a slope of a revetment.

《Conventional technology》 As a construction method of hydrophilic revetment using natural stone, after performing basic work including placing concrete on the slope of the revetment, it has been relatively common to use cobbles, crushed stones, and half cobblestones. Large natural stones are laid side by side and then concrete is poured to complete the construction of the slope with a part of the top of the natural stone exposed.

However, this method has the following problems.

<Problems to be solved by the invention> In other words, since this method involves laying natural stones on slopes, in a place where the slope is relatively steep, stone lifting work using a crane to concrete placing work During this period, the sitting of the natural stone was unstable, and there was a problem in ensuring the safety of workers.

In addition, it is necessary to pay particular attention to the visual appearance effect of hydrophilic revetments, which have been in increasing demand in recent years, but as mentioned above, natural stones are not uniform in size and shape. If they are laid side by side, the appearance of the finished product will deteriorate. On the contrary, if the size and shape are to be arranged while being arranged, the work period tends to be delayed due to the skill and feeling of the site workers throughout the work.

Furthermore, in rivers, the water level differs in the rainy season and the dry season, and construction work must be concentrated during periods when the water level is low. I could not do it.

By the way, as an alternative to the method of laying natural stones of this kind, there is also a method of laying tile blocks made of precast concrete of appropriate size.

With this method, it is only necessary to lay out standardized flat tile blocks, so it does not require the skill of the worker, the construction period can be shortened, the finish is uniform, and the seating during installation work is also good. Therefore, it is preferable from the viewpoint of ensuring the safety of workers.

However, the weight per unit volume of this tile block is lighter than that when natural stone is used, and the effect of suppressing the slope is small, and when trying to secure the weight as natural stone, the volume per tile block is extremely large. In addition to being obliged to use it, it hinders transportation, etc., and it was more expensive in terms of production cost than using natural stone.

This invention solves the above problems, and its purpose is to improve the low workability, which was a drawback, while taking advantage of the large weight per volume of natural stone. It provides a method of constructing a revetment using stone.

<< Means for Solving Problems >> In order to achieve the above-mentioned object, the present invention is directed to a seawall in which natural stones are fixed by concrete after laying natural stones on the slope at the waterside of a river or the like. In the construction method, the primary concrete is placed in advance in the lower part of the plurality of natural stones in advance to form a concrete block in which the upper side of each of the natural stones is exposed, and the blocks are laid on the slope. The gist is that a plurality of blocks are integrated by placing secondary concrete on the blocks with part of the tops of the natural stones exposed.

<< Operation >> The laying and laying method is almost the same as that of the conventional tile block, and the laying and laying can be performed in a stable state even on an inclined surface.

Further, by aligning the sizes of the natural stones when forming the blocks, no extreme irregularity occurs between the arranged stones.

<< Embodiment >> An embodiment of the present invention will be described in detail below with reference to the drawings.

1 (a) to 1 (c) show a method of constructing a seawall according to the present invention.

In the figure, a waste concrete 1 is cast on a slope E1 of a ground E constituting a hydrophilic revetment wall formed in a predetermined gradient, and a cobblestone block 2 is laid on the surface, and then a secondary concrete 3 is cast. The secondary concrete 3 is flattened with a part of the top of the cobblestone block 2 exposed to complete the construction.

Each of the cobblestone blocks 2 is manufactured in advance in a factory or the like, and in this embodiment, the bottoms of two natural cobblestones 4 having similar sizes are made of a reinforced concrete tile block 5 having a constant thickness and outer dimensions. It is integrated with.

As a manufacturing method thereof, as shown in FIGS. 2 (a) and 2 (b), a plurality of reinforcing bars 7 are arranged in parallel in a fixed mold 6 and reinforcing reinforcing bars 8 are crossed in an X shape. With the
Install the pair of cobblestones 4 in parallel on the upper part of the reinforcing bar 7,
Next, by pouring the primary concrete into the mold 6 and solidifying it and then removing it from the mold 6, a cobblestone block 2 in which two cobblestones 4 are integrated in parallel on the block 5 having a certain size is completed.

In addition, both ends of the reinforcing bar 8 are bent in a U shape in the upper part to form a handle part 8a projecting to the upper left and right parts of the tile block 5 so as to simplify the lifting work by a crane.

Therefore, the work of laying and arranging the cobblestone blocks 2 unitized in this way is exactly the same as the conventional laying work of the concrete tile blocks, and the cobblestone blocks 2 are installed from the accumulation place by using a crane or the like. For example, as shown in FIG. 3 (a), by installing the cells while sequentially moving to a place, the rows can be arranged closely by arranging the seams with no gaps, or by arranging them densely in a grid pattern. Complete. And since this work only arranges the flat block 2, the slope E
1 is stably arranged, no skill is required for the operator, and the working time can be extremely shortened.

After that, the secondary concrete 3 is cast on the surface of the cobblestone 2 and the top of the tile block 5 is flattened so that a part of the top of the cobblestone 4 is exposed as shown in FIG. 3 (b). Construction is complete.

In this case, the handle portion 8a of the reinforcing bar 8 is embedded in the secondary concrete 3 and is interposed between the primary and secondary concrete 3 to reinforce the joint strength between them.

If the secondary concrete 3 is entangled with the handle portion 8a and vertical and horizontal reinforcement is applied before the concrete is placed, the joint strength is further increased.

In the completed construction state, the appearance is exactly the same as that of a conventional revetment in which boulders are arranged, and the compression effect according to the weight of the boulders 4 is also completely the same.

Furthermore, since the exposed surface of the cobblestone 4 is made uniform in size during the processing for forming the block, it has a substantially constant shape, and the appearance in the array state is also good.

In addition, although the two cobblestones 4 are made into blocks in the above-mentioned examples, it is a matter of course that one or three or more may be collectively made into blocks, and the formability at the time of making blocks and the work at the time of laying them out The number will be determined by considering the sex. Further, it goes without saying that other natural stones such as crushed stone and half-broken stone other than cobblestone can be applied.

<< Effects >> As described in detail with reference to the above examples, according to the method of the present invention, the laying and arranging method is almost the same as that of the concrete block, and the lining and laying can be performed in a stable state even on an inclined surface, and The construction speed is also significantly improved compared to the conventional case of laying natural stones, and in the completed state, the appearance and the effect of suppressing the slopes by natural stones are exactly the same as the conventional construction method.

Further, according to the method of the present invention, by arranging the sizes of the natural stones at the time of forming the block, an extreme unevenness is not caused between the arranged stones, and it does not depend on an expert's hand as in the past. Both look good.

Therefore, according to the method of the present invention, it is particularly suitable for a construction site where the appearance must be considered, such as a water revetment of a river, and the construction period is only during the dry season.

[Brief description of drawings]

FIGS. 1 (a), (b), and (c) are cross-sectional explanatory views showing the construction sequence of the method of the present invention, and FIGS. 2 (a) and (b) are explanatory diagrams showing the construction sequence of the cobblestone block. Drawing (a) and (b) is explanatory drawing of the laid state of a cobblestone block, and a secondary concrete pouring state. 1 …… Abandoned concrete, 2 …… Boulder block 3 …… Secondary concrete, 4 …… Boulder (natural stone) 5 …… Tile block

Claims (1)

[Claims] 1. A method of constructing a revetment in which natural stones are laid on the slopes at the waterside of a river or the like and then fixed between the natural stones by concrete, in which primary concrete is preliminarily placed under the plurality of natural stones. Place it,
A concrete block is formed in a state where the upper part of each of the natural stones is exposed, and the blocks are laid on the slope, and then secondary concrete is placed on the block with a part of the top of the natural stone exposed. A method of constructing a revetment using natural stone, which is characterized by placing a block and integrating a plurality of blocks.