JP2884251B2 - Scour prevention construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a scouring prevention method for foundation works such as rubble.

<Conventional technology> As a method of preventing scouring of basic rubble, a method is known in which rubble heavier than rubble is laid on the surface of rubble and the weight of the rubble counters the scouring power of tidal currents. .

More specifically, divers are rubbing stones one by one from the sea.

<Problems to be Solved by the Present Invention> The conventional scouring prevention technology described above has the following problems.

<a> Because we depend on diver for leveling work of coarse stone,
Not only is the work inefficient, but the construction period tends to be longer.

<B> Because long-term diving work is required, there are concerns about the effects on the health of divers.

<C> Skill leveling requires skill, but it is becoming difficult to secure such skilled divers.

<Object of the present invention> The present invention has been made to solve the above problems, the purpose of which is to reduce the labor load of divers and significantly shorten the construction period and improve construction efficiency, An object of the present invention is to provide a scouring prevention method.

<Means for Solving the Problems> That is, the present invention relates to a scouring prevention method for laying rubble for preventing scouring on the surface of a base rubble. The stone is connected with a rope material so as to be able to follow the irregularities on the surface of the basic rubble, and the aggregate of the coarse stone is manufactured in advance, and the plurality of aggregates of the coarse stone are sequentially laid on the surface of the basic rubble. It is a scouring prevention method.

<Description of the Present Invention> Hereinafter, the present invention will be described with reference to the drawings.

 First, the rubble used in the present method will be described.

<A> Coarse stone Conventionally, a large number of cobble stones were laid one by one, but in the present invention, as shown in FIG. 1, an aggregate of a group of a plurality of cobble stones arranged vertically and horizontally on the same plane. A is laid as a laying unit.

The crushed stone 1 is made of a heavy material such as natural stone, metal or concrete, and its shape is preferably a prism that can suppress generation of a gap between the laid crushed stones 1.

In addition, a hanging tool 2 is provided at the center of the upper surface of the rubble 1 in consideration of the handleability of the rubble 1.

The hanger 2 has sufficient strength to withstand the hanging load of the rubble 1, and is particularly connected to the rubble 1 in a state in which the rubble 1 does not separate. In FIG. 2, the hanging member 2 provided with a ring on one side of the rod-shaped body is attached to an adhesive 3
Although the case where the rubble 1 is penetrated and fixed by using (for example, an epoxy resin) is shown, it is a matter of course that other known suspension structures can be adopted.

<B> Coarse Stone Group Connection Structure FIG. 3 is a plan view showing a case where a plurality of coarse stone groups are connected using the rope material 4.

As the rope material 4, a wire rope subjected to a rust-proof treatment, a high-strength resin rope excellent in corrosion resistance, or the like is used.

Then, using the lower part of the neck of the hanging tool 2 of each rubble 1 arranged in the vertical and horizontal directions, both ends of the rope material 4 are fixed between the outermost rubbles 1 with a rope clip or the like. For the rubble 1, the rope material 4 is wound around the neck of the hanging tool 2, and finally the rope material 4 is stretched in a grid shape to provide continuity between the adjacent rubbles 1.

The reason that the crossing portion of the rope material 4 stretched in the vertical and horizontal directions is wound without fixing is to make each of the adjacent rough stones 1 follow the unevenness of the laying surface.

<Operation> Next, the construction method will be described.

<A> Towing (FIG. 4) As shown in FIG. 3, a plurality of aggregates A in which a plurality of coarse stones 1 are tied together by a rope material 4 are produced, and these are mounted on a barge 5 and towed to the site.

The aggregate A of the rubble 1 is manufactured by loading the shore made on the berth 5 or by arranging and connecting the rubble 1 group on the berth 5.

<B> Laying (Figs. 1, 5 and 6) Upon arrival at the laying site, the aggregate A of the coarse stones 1 is lifted by the clean ship 6 or the like, and is sequentially installed on the basic rubble B on the sea floor.

When the aggregate A of the rubble 1 is lifted, as shown in FIG.
By using the above, the assembly A can be safely suspended in a well-balanced manner.

At this time, the diver only needs to assist the installation of the aggregate A.

Each rubble 1 constituting the aggregate A is wrapped with a rope material 4 at the intersection, and is allowed to move freely, albeit slightly, so that the rubble 1 follows the irregularities on the surface of the basic rubble B as shown in FIG. Is good.

<C> Finishing work (Fig. 7) Finally, each rubble 1 is leveled by a diver.

If necessary, the gap generated between the adjacent rubbles 1 is thinned 9.

In this manner, scouring is prevented by covering the surface of the basic rubble B with the rough stones 1 for preventing scouring.

<Effects of the Present Invention> The present invention is as described above, and the following effects can be obtained.

<A> The work efficiency can be remarkably improved because the work of laying stones can be done in units of coarse stones.

Therefore, the construction period can be significantly reduced as compared with the related art.

<B> Not only can the diver's work load be reduced, but the diving time can be shortened.

Therefore, the working environment and safety of the diver can be improved.

<C> The number of divers can be reduced.

<D> As the laying area increases, the construction and economic advantages become more remarkable.

<E> Since the adjacent rubble stones are connected by rope material, the scouring prevention effect is high.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a scouring prevention method according to the present invention, and is a perspective view when a rubble aggregate is laid. FIG. 2: A partial cross-sectional view of a rubble provided with a hanger FIG. Fig. 4: Illustration when towing Fig. 5: Overall view when laying aggregate of rubble Fig. 6: Enlarged view for explaining laying of rubble Fig. 7 : Enlarged view for explaining the finished state of rubble

──────────────────────────────────────────────────続 き Continuation of front page (58) Investigated field (Int.Cl. ⁶ , DB name) E02B 3/14 301 E02D 15/10

Claims (1)

(57) [Claims] A scouring prevention method for laying rubble for preventing scouring on the surface of a basic rubble, wherein each rubble follows irregularities on the surface of the base rubble. A method for preventing scouring, characterized in that an aggregate of rubble is preliminarily manufactured by being connected with a rope material, and the plurality of aggregates of rubble are sequentially laid on the surface of a basic rubble.