JPH0771041A - Anchor of caisson rubber, and caisson rubber - Google Patents

Abstract

PURPOSE:To provide a caisson rubber capable of being easily mounted to a rubber mat and having high fixed force to a caisson in the case an anchor mechanism of the caisson rubber provided to the bottom of a concrete caisson. CONSTITUTION:A caisson rubber is constituted of a shallow-bottomed cylindrical head section 2 and an anchor section 3 extended from the bottom, and the head section has a flange 4 on its edge. The anchor section is such that an anchor having a projection 5 and a swelling sections 6 is inserted in such a position having a through-hole in a rubber mat and, at the same time, spot- facing an opening in the undersurface. The projection is fixed by extending it up to the rear side of the rubber mat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a caisson rubber to be laid under a caisson, particularly to an anchor structure for fixing the caisson to concrete.
Here, the term "caisson" has a general meaning of hydraulic gravity structures.

[0002]

2. Description of the Related Art When constructing breakwaters such as breakwaters, quays, and seawalls using caisson, in order to increase the sliding resistance between the mound made of rubble on the ground and the caisson placed on it, Used an asphalt mat.

However, since the asphalt mat is limited in its laying due to weather and marine conditions and the anti-slip effect is not sufficiently satisfied, it has been attempted in recent years to use a rubber mat in place of it.

This mat called "caisson rubber" had a difficulty in that the cost was high, but as a result of research with co-workers, the inventor found that rubber powder recovered from used rubber products such as waste tires. It has already been disclosed that the molded product obtained by heating and pressurizing with a cross-linking agent can be advantageously used, and that the cost can be reduced thereby (Japanese Patent Laid-Open No. 62-50525).

The caisson rubber is usually attached to the bottom of the concrete caisson at the same time when it is manufactured,
And it is also advantageous in construction.

The inventor who studied how to attach the caisson rubber invented and proposed various mechanisms as described below.

1) A through hole is provided in a rubber mat and a lower surface is countersunk, a nut member having a bottom covered with a rubber stopper is inserted therein, and an anchor member is screwed to the nut member from the upper surface to fix the anchor. Providing (Actual Kaisho 6
2-200741).

2) A through hole is formed in the rubber mat, the opening portion of the lower surface thereof is countersunk, and the head of a bolt having a flat and large diameter head is formed into a shape corresponding to the above counterbore with a head cover made of a rubber material. The enveloped dowel is inserted into the through hole, and the washer is sandwiched from the upper surface and fastened with a nut to fix it (actual flat opening 3-2044).

3) A metal dowel cap is interposed between the spot facing and the bolt head in the above 2) so that it can withstand a large stress (actual opening flat 5-22535).

The third anchor is used by inserting a dowel into a through hole of a rubber mat via a dowel cap, and pressing a bush nut or the like to fix it with a stopper.

[0011]

SUMMARY OF THE INVENTION The main object of the present invention is to improve the anchor of the third type so that it can be attached to a caisson rubber in one step, and the labor during caisson construction is significantly reduced. In addition, it is still another object of the present invention to provide a caisson rubber anchor structure that can secure the fixation of the caisson rubber even if a large shear stress is applied between the caisson body and the caisson rubber.

[0012] A secondary object of the present invention is to provide an anchor for the above caisson rubber, which can be manufactured with a particularly small number of processing steps.

[0013]

SUMMARY OF THE INVENTION The main object of the above is to provide a shallow bottomed cylindrical head portion (2) as shown in FIGS. 1 to 3 according to the present invention and to extend outward from the bottom of the head portion. An anchor portion (3) extending along, the head portion having a flange (4) at the edge, the anchor portion having a protrusion (5) for locking the anchor to the rubber mat (1),
And a caisson rubber anchor characterized in that it has at least one bulge (6) for fixing the anchor in concrete.

The secondary object is achieved by the above-formed anchor manufactured by sequentially forming the head portion and the anchor portion by stamping and forging a steel bar.

A caisson rubber using such an anchor is naturally included in the present invention. That is,
As shown in FIG. 4, the rubber mat (1) has a through hole (1
1) is provided and the lower surface opening is countersunk to form a counterbore portion (12), the above anchor is inserted from the lower surface into the through hole, and the protrusion (5) is formed as shown in FIG. ) Is the caisson rubber made by attaching the anchor to the rubber mat by reaching the upper surface of the rubber mat.

Advantageously, the rubber mat (1) is made mainly of recycled rubber, as proposed by the inventor consistently in the inventions and inventions up to now. It is preferable to provide a plurality of grooves or lattice-shaped depressions on the lower surface to enhance sliding resistance with the mound. The through hole (11) and the counterbore (12) of the lower surface opening thereof can be easily provided by molding using a mold having a corresponding shape. Of course, it may be formed by cutting the plate-shaped body.

[0017]

[Operation] Through hole (11) of anchor rubber mat (1)
, And the protrusion (5) reaches the upper surface of the rubber mat, it has a retaining effect in the opposite direction.
The anchor is fixed to the rubber mat (1) and comes into close contact with the through hole and the spot facing portion. The anchoring of the anchor to the concrete is obtained by the bulge (6). In the example shown, the relatively recessed part created in forming the bulge also serves for fixation.

The caisson rubber thus obtained is used on the bottom surface to form a mold, and concrete is cast to form a caisson in which the caisson rubber is integrally fixed.

[0019]

EXAMPLE An anchor having the dimensions shown in FIG. 1 was produced by cold die forging of carbon steel. On the other hand, a rubber mat having a thickness of 30 mm prepared by adding a cross-linking agent to the powder of recovered rubber and having a thickness of 30 mm was prepared having a through hole through which an anchor portion was inserted and a counterbore portion matching the shape of the head portion. The above anchor was inserted through this, and the protrusion (5) was fixed by making it reach the upper surface from the rubber mat.

By fixing both sides of this rubber mat to the base,
When a tensile test was performed to pull the anchor upward,
By the time the rubber mat is destroyed and the anchor comes out,
A tensile force of 1850 kg was required. At this time, the flange of the head portion of the anchor that had come off was crushed.

In order to investigate the resistance to shear stress,
Separately, one end of the rubber mat was fixed, two nuts were welded to the anchor portion, a wire was hung between them, the hook was connected to the front hook of the truck, the gear was put in the back, and the truck was run. Axel 3-4 times, then rubber mat 2
It stretched about 0% and the anchor finally came out. Also in this case, the head portion was largely deformed.

[0022]

The anchor of the present invention can be easily attached by inserting the anchor portion into the through hole of the rubber mat and inserting it until the protrusion is exposed to the back side.

The caisson rubber using the anchor of the present invention is kept substantially watertight between the head portion of the anchor and the spot facing portion of the rubber mat, and between the anchor portion and the through hole of the rubber mat so that the anchor portion Since seawater does not invade people, corrosion can be prevented by ensuring corrosion protection of the head part.

Since the anchor in the caisson rubber is a durable steel material, even if a strong shearing stress is applied between the caisson body and the caisson rubber, it is rarely bent or bent, and it is a shallow dish type flange. The head part that has is closely attached to the spot facing part of the rubber mat and keeps the caisson rubber securely fixed to the caisson body. Due to such properties, the caisson rubber of the present invention is particularly useful when the construction conditions are bad or when the caisson is installed in a place where it is subjected to strong waves.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing the shape and dimensions of a typical example of a caisson rubber anchor of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

3 is a sectional view taken along line BB of FIG.

FIG. 4 is a cross-sectional view showing the shapes of a through hole and a spot facing portion of a rubber mat.

FIG. 5 is a cross-sectional view showing a state where a caisson rubber is assembled by inserting the anchor of FIG. 1 into a rubber mat.

[Explanation of symbols]

 1 Rubber Mat 11 Through Hole 12 Counterbore Part 2 Head Part 3 Anchor Part 4 Flange 5 Protrusion 6 Swelling Part

Claims (4)

[Claims] 1. A shallow bottomed cylindrical head portion (2),
An anchor portion (3) extending outward from the bottom of the head portion, the head portion having a flange (4) at the edge, the anchor portion having a protrusion () for locking the anchor to the rubber mat (1). 5) and at least one bulge (6) for fixing the anchor in concrete
Caisson rubber anchor characterized by having. 2. A head part and an anchor part are successively formed by stamping and forging a steel bar.
Anchor. 3. An anchor according to claim 1, wherein the rubber mat (1) is provided with a through hole (11) and a lower surface opening thereof is countersunk to form a counterbore portion (12), and the through hole is formed from the lower surface thereof. The caisson rubber is characterized in that an anchor is attached to the rubber mat by inserting the above into the upper surface of the rubber mat and inserting the projection (5) to the upper surface of the rubber mat. 4. The rubber mat (1) is formed by heating and pressing a rubber powder recovered from used rubber products to which a cross-linking agent has been added, and has a plurality of grooves or lattice-shaped recesses on the lower surface. The caisson rubber according to claim 3, which comprises: