JPH03267411A - Wave absorbing caisson - Google Patents

Abstract

PURPOSE:To promote fixation between a concrete structure and a wave absorbing pipe to prevent the slippage at the boundary therebetween by providing a protruding member on a wave absorbing pipe so that it protrudes into the concrete of a concrete structure. CONSTITUTION:An annular throttling section 16 of concrete having an angular cross section is provided on the inner periphery of wave absorbing pipes 11 in a front wall 8 of a main body 4 of a concrete caisson to form a narrow passage 21 for absorbing waves. In the tapered section 16, reinforcing bars 17 are placed so as to be connected to the pipes 11. Protruding bars 18 are fixed to the reinforcing bars 17. And the bars 18 are extended into the concrete of the wall 8, passing radially through the pipes 11. A protruding ring 19 with a rectangular cross section is welded to the outer periphery of the pipes 11 in a rear wall 9 so that the ring 19 is positioned in the concrete of the wall 9.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wave-dissipating caisson for absorbing waves.
There are some known examples such as No. 957.

This conventional wave-dissipating caisson has a plurality of wave-dissipating pipes arranged inside a concrete caisson having a front wall and a rear wall and extending between the front wall and the rear wall. A wave-dissipating pipe is made of a cast iron pipe or the like, and when waves pass through the pipe, waves are dissipated by the action of narrow passages provided in the pipe.

Problems to be Solved by the Invention However, in such conventional wave-dissipating caissons, the pipe and concrete are often fixed by simply attaching the concrete to the surface of the pipe.

Therefore, there is a problem that the adhesion force is not necessarily sufficient, and peeling or misalignment easily occurs between the two.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a wave-dissipating caisson with improved adhesion between concrete and the pipe body.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a concrete structure and this concrete structure! ! 4. A wave-dissipating caisson having a wave-dissipating pipe body integrated with the wave-dissipating pipe body, which is provided with a protruding member that protrudes from the wave-dissipating pipe body into the concrete of the concrete structure. .

Effect: According to such a structure, concrete adheres not only to the surface of the tube but also to the protruding member, and furthermore, the protruding member enters into the concrete of the concrete structure. Therefore, the adhesion between the concrete structure and the pipe body is the same as above, and displacement of the two on the adhesion surface is effectively prevented.

Embodiment FIG. 3 is a sectional view of a wave-dissipating caisson according to an embodiment of the present invention, and FIG. 4 is a view simultaneously showing the front and back sides thereof.

In Figures 3 and 4, l is a concrete caisson, which is a plate-shaped foundation 3 installed on the seabed 2, etc.
and a box-shaped main body part 4 constructed on this foundation part 3,
The upper surface of the main body part 4 is covered with an upper mounting part 4a. In FIG. 3, 5 is the open sea side, and 6 is the inland sea side, and the bottom of the main body 4 is formed with (I number of) water permeable holes 7 that penetrate from the open sea @S toward the inland sea side 6. The main body part 4 is
It has a front wall 8 facing the open sea side 5, a rear wall 9 facing the inland sea side 6, and a pair of side walls 10 closing both sides of the main body 4.

The main body portion 4 is provided with a plurality of wave-dissipating tubes 11 that can form wave-dissipating holes penetrating from the front wall 8 to the rear wall 9.

FIG. 1 shows the detailed structure around the wave-dissipating tube 11.

That is, in FIG. 1, the wave-dissipating pipe 11 is made of ductile cast iron, and has a socket 12 at one end and a socket 12 at the other end. There are 13 total iTI ports. And socket 1
2 is embedded in the front wall 8 and supported by the front wall 8, and the socket 13 is embedded in the rear wall 9 and supported by the rear wall 9, so that both ends of is supported by the main body part 4. Although the insertion port 13 reaches the surface of the rear wall 9, the tip of the socket 12 is cut off and is placed so as to be embedded at a distance from the surface of the front wall 8. Cement material IvNIL4 is formed on the inner surface of the wave-dissipating tube 11, and the outer surface of the wave-dissipating tube 11 is coated with polyethylene nucleop 15.
is covered.

On the inner periphery of the wave-dissipating pipe 11 in the front wall 8, a concrete grade part 16 with an annular chevron-shaped cross section is provided, and this constricted part 16 forms a narrow passage part 21 for dissipating waves. There is. The thickness of the narrow passage portion 21 (jJ row dimension) is made to be equal to the thickness of the front wall 8.

Reinforcing bars 17 are arranged within the concrete of the constricted portion I6. This reinforcing bar 17 has a protruding rod portion 18, and is configured to penetrate the protruding rod portion 18Vi and the wave-dissipating pipe 11 in the radial direction and enter into the concrete of the front wall 8.

A protruding ring 19 having a rectangular cross section is welded to the outer periphery of the insertion port 13 of the wave-dissipating tube 11.
It has penetrated into the concrete.

When manufacturing a wave-dissipating caisson with such a configuration, the first
As shown in the figure, a plurality of wave dissipating tubes 11 with reinforcing bars 17 and protruding rings 19 set therein are temporarily fixed in a pouring frame, and concrete is poured into the pouring frame and hardened. Therefore, it is sufficient to form the caisson 1. At this time, the aperture portion 16 may also be formed at the same time.

The completed wave-dissipating caisson is installed at an appropriate location, for example, at a distance from the coast, but has the wave propagated from the open sea side 5? 8! Most of the waves are guided into the wave dissipating tube 11.

And narrow v! The waves are dissipated by passing through the r section 21 or by being subjected to frictional force from the inner surface of the tube. Since the wave-dissipating Wll is also open on the inland sea side 6 and water permeable holes 7 are formed in the caisson 1, the inflow and outflow of water between the open sea side 5 and the inland sea side 6 is ensured.

As shown in FIG.
9, the adhesion between the wave dissipating tube 11 and the front wall 8 and rear wall 9 is strengthened, and these are reliably integrated. Furthermore, displacement on the adhesion surface is effectively prevented. A reinforcing bar 17 is disposed inside the constricted part 16, and this reinforcing bar 17 is connected to the wave-dissipating tube 11, so that the strength of the constricted part 16 itself and the constricted p part 16 and the wave-dissipating tube 11 are reduced.
Improved adhesion with both is achieved.

In addition, cement mortar is installed on the inner surface of the cast & manufactured wave dissipating pipe 11.
Since a layer is formed and the outer surface is coated and covered with the polyethylene sleeve 15, corrosion protection of the wave-dissipating tube 11 is ensured.

FIG. 2 shows the detailed structure around the wave-dissipating pipe 11 in a wave-dissipating caisson according to another embodiment of the present invention. Here, wave dissipating tube 1
1 does not have a receiving structure as shown in FIG. 1, but is composed of a tube whose inner and outer diameters are constant over its entire length, and protruding rings 19 are welded to the outer periphery near both ends of the tube.

In the wave absorber Xl of FIG. 2, the configuration of the aperture section 16 is also different from that of FIG. 1. In other words, numeral 20 denotes a constriction section main body, which is made of ring-shaped ductile cast iron with a hollow chevron-shaped cross section, and is welded to one end of the wave-dissipating tube 11. A thick wall portion 22 for forming a narrow passage portion 21 is formed on the inner peripheral portion of the throttle body 20 . In the space between the diaphragm main body 20 and the wave-dissipating tube 11,
Conc'J-)27 is filled. Further, on the surface of the aperture section main body 20, in addition to a sink rich coating film 23, a pure epoxy coating film 24 is also formed.

In the wave-dissipating caisson having such a configuration, as in the case shown in FIG. In addition to achieving this, the occurrence of misalignment on the adhesion surface is prevented.

FIG. 5 shows another example of caisson l. Figures 3 and 4
In the caisson I shown in the figure, the side wall 10 has a closed structure, but in the caisson I shown in FIG. 5, it has an open structure. That is, an opening 25 communicating with the water permeation hole 7 and an opening 26 communicating with the space between the front wall 8 and the rear wall 9 are formed in the side wall lO of the caisson I.

According to such a configuration, the weight of the caisson I can be reduced. In addition, by the N port 25, the adjacent water permeable hole 7
They communicate with each other, and water flows in multiple directions within the water permeable holes 7, resulting in effective water inflow and outflow 9.

Effects of the Invention As described above, according to the present invention, since a protruding member that protrudes toward the inside of the concrete of the wave-dissipating pipe empty concrete structure is provided, the adhesion between the concrete structure and the wave-dissipating pipe is improved. This makes it possible to reliably integrate the two, and to prevent misalignment between the two.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a wave-dissipating caisson according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of a wave-dissipating caisson according to another embodiment of the present invention, and FIG. FIG. 4 is a view showing the front and back sides of the wave-dissipating caisson at the same time, and FIG. 5 is a perspective view of another example of the caisson. l...Caisson, 8...#J wall, 9...Rear wall, 1
DESCRIPTION OF SYMBOLS 1...Wave dissipating tube, 18...Protruding contact part, 19...Protruding ring. 6 f Figure 2

Claims (1)

[Claims] 1. A wave-dissipating caisson having a concrete structure and a wave-dissipating pipe integrated with the concrete structure, which projects from the wave-dissipating pipe into the concrete of the concrete structure. A wave-dissipating caisson characterized by being provided with a protruding member.