JP4067192B2 - How to prevent rocks such as sloping levee or rubble mound - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention prevents the stone of a core layer or a rubble mound from coming out between the covering blocks in an inclined bank or a rubble mound whose surface of a stone core layer is covered with a covering block made of a large diameter stone or a deformed block. The present invention relates to a method for preventing a rock such as an inclined bank or a rubble mound from coming out.
[0002]
[Prior art]
Conventionally, in the sloped levee and rubble mound loaded with stones in a trapezoidal shape, a relatively small-diameter stone is formed as a core layer and then covered with a large-diameter stone or deformed block that is stable against waves. It is common practice to keep the stones in the core layer from slipping out by waves.
Moreover, in the rubble mound as the foundation of the caisson, the surface of the rubble mound is often covered with a rectangular block, but a deformed block may be used.
[0003]
However, under severe wave conditions, the deformed block to be covered becomes large, so that the core layer and rubble mound stones do not escape from between the blocks, and the covering is between the core layer and rubble mound stones and the covering block. Often, a filter layer of stone or block having a weight about one tenth of the block is provided.
[0004]
For example, in the manual of the US Army Corps of Engineers, the standard cross-sectional shape of an inclined bank is as follows: a core layer 12 made of small stones under wave breaking conditions and about one-tenth of the covering block 3 as shown in FIG. It is recommended to form a three-layer type composite sloped bank with a filter layer 2 made of stone or a block having a weight of 3 mm and a covering block 3.
In FIG. W. L is the high tide level. W. L indicates the low tide water level, and W indicates the top width.
[0005]
By the way, in Japan, it is difficult to procure large-sized stones, so that the filter layer 2 is often not a stone but a deformed block.
However, in the case of an inclined levee in which a conventional stone is stacked in a trapezoidal shape as described above, it takes a long time for the construction, which is a four-step process of putting stones, leveling the surface, installing a filter block and installing a covering block.
In particular, it takes a lot of time to install the block, and the filter block affects the installation accuracy of the upper covering block, so that it needs to be installed in an orderly manner.
[0006]
In addition, there is a problem that the construction cost increases because each block is likely to be damaged by high waves during the construction process, and an expensive block is used. These problems are common to the rubble mound.
The purpose of the filter layer 2 is to prevent the stone from coming out of the core layer 12, so that the deformed block that has been conventionally used as the filter layer 2 is replaced with a material that is more economical and capable of fully functioning. The present invention was reached as a result of various examinations and experiments, focusing on the possibility of this.
[0007]
[Problems to be solved by the invention]
In order to prevent the rock of the core layer of the slope bank or the stone of the rubble mound from coming out, the present invention provides a chain formed in the form of a mesh instead of the deformed block conventionally used as a filter layer, or the core layer of the slope bank or Providing a method to prevent the rock from the sloped levee or rubble mound from falling out by using a rope or band formed in a mesh shape made of natural or synthetic fiber that closely follows the surface of the rubble mound, reducing the construction work time and reducing the construction cost. To do.
[0008]
[Means for Solving the Problems]
The present invention relates to a roll of a chain formed in a mesh shape that does not allow stones to pass through the surface of a core layer or rubble mound made of stone , or a natural fiber or synthetic material that follows the surface of the core layer or rubble mound of the inclined levee It consists of a rope or belt roll formed in a mesh shape made of fiber or the like, and then laid out, and then a method of preventing rocks from falling off such as an inclined bank or a rubble mound on which a covering block is installed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a method for preventing a stone of an inclined bank or a rubble mound according to the present invention will be described with reference to the drawings. In this embodiment, after forming a rubble mound 1 made of stone as a basis of a caisson 4, a caisson is formed. 4 illustrates the procedure for preventing the stone from being removed from the rubble mound 1 after the installation of 4.
[0010]
First, in FIG. 1, on the surface of the rubble mound 1, for example, a roll of a mesh-like chain 7 as shown in the enlarged plan view of the main part of FIG. Is fixed to the lower end of the caisson 4 by a diver.
FIG. 5 shows an enlarged perspective view of the essential part of FIG. 1, and the installation trolley 8 is moored via a winch 11 by a mooring line 10 and a caisson 4 and an anchor (not shown).
[0011]
Next, as shown in FIG. 2, the installation carriage 8 is moved in the direction of arrow F, and the roll of the chain 7 is unwound to move from the state shown in FIGS. 3 to 4 to be laid on the surface of the rubble mound 1. FIG. Then, the mesh-like chain 7 is cut by a diver with a predetermined length, and the cut end portion is fixed to the sinker 12.
[0012]
When the installation of the chain 7 is completed on the entire surface of the rubble mound by repeating the steps from Fig. 1 to Fig. 4 in the width direction, all the installation is completed by installing a covering block such as a large stone on it. To do.
The mesh size of the mesh-like chain 7 is about 80% of the minimum particle size of the stone of the rubble mound 1, but the surface of the rubble mound 1 is used instead of the chain 7 of the above embodiment. A following rope or band made of natural fiber or synthetic fiber may be used.
[0013]
In addition, since said chain 7, natural fiber, etc. change with time, it is preferable to use the rope or strip | belt made from a synthetic fiber for the permanent structure etc. which are used for a long period of time.
【The invention's effect】
According to the above-described method of preventing the rock from the sloped bank or the rubble mound according to the present invention, a chain or a rope or belt made of natural or synthetic fiber is used instead of a conventionally used deformed block. By using it, the laying work can be completed in a short time, so that it is possible to prevent a disaster during construction and improve the safety of the work.
[0014]
Moreover, compared with the case where a deformed block is used for the filter layer used conventionally, a construction cost and a construction period can be reduced and it is economical.
[Brief description of the drawings]
FIG. 1 is a side view illustrating a construction procedure according to an embodiment of a method for preventing an outflow of an inclined bank or a rubble mound according to the present invention, with a chain end fixed to a caisson.
FIG. 2 is a side view of the state at the start of chain unwinding following FIG. 1;
FIG. 3 is a side view showing a state in which the chain is being laid on the upper surface of the core layer of the rubble mound, following FIG. 2;
FIG. 4 is a side view of the state after the chain is laid on the upper surface of the core layer of the rubble mound, following FIG. 3;
5 is an enlarged perspective view of a main part in the state of FIG. 1. FIG.
6 is a plan view of an enlarged main part of the chain of FIG. 1. FIG.
FIG. 7 is a diagram showing the formation of a three-layered type composite slope bank under non-breaking conditions used by US Army Corps of Engineers.
[Explanation of symbols]
1 Rubble mound 7 Chain

Claims (1)

Rolls of chains formed in a mesh shape that do not allow stones to pass through the surface of the core layer or rubble mound made of stone , or made of natural fibers or synthetic fibers that follow the surface of the core layer or rubble mound of the inclined levee A method of preventing the escape of stones such as sloping levee or rubble mound, where a roll of rope or belt formed in a mesh shape is unwound and laid, and then a covering block is installed thereon.

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