JPS5935643Y2 - Friction members in gravity structures - Google Patents

Description

[Detailed description of the invention] This invention relates to the bottom shape of friction members such as rubber blocks that are attached to concrete structures, and is particularly applicable to caissons, concrete blocks, L-shaped blocks, etc. used for breakwaters, quays, reclaimed sea walls, etc. This invention relates to the bottom shape of a friction member attached to the bottom of a so-called gravity type structure for the purpose of increasing the coefficient of friction between the gravity type structure and the foundation surface.

Utility Model Application No. 54-89886 describes a structure in which rubber blocks that increase the coefficient of friction are attached to gravity-type structures such as caissons used in the construction of breakwaters, quays, etc. to prevent them from sliding due to external forces such as wave forces. 54-129611
It was proposed in No.

However, the following problems may occur with the rubber blocks already proposed.

For example, to explain a caisson manufactured using a floating dock, the deck of the floating dock itself is used as a surface plate, and rubber blocks are placed on it as appropriate, rubber block mounting brackets are attached, and ready-mixed concrete is poured. A rubber block is attached to the bottom of the caisson at the same time as the caisson is manufactured.
be.

However, even if water is poured into the water tank of the floating dock to float the caisson obtained by the above manufacturing method and the floating dock is lowered to a predetermined depth, the rubber blocks are pressed against the deck of the floating dock by the weight of the concrete and do not stick tightly. , it is difficult for water to circulate between the surface of the rubber block and the deck, making it impossible to obtain the buoyancy as designed.

. When placing the rubber blocks, a release agent is applied to the deck of the floating dock, or asphalt felt is laid down, but the rubber blocks and the deck are in close contact with each other, or the rubber blocks act as suction cups, causing the caisson to obstructs the levitation of

When it floats up, it floats up suddenly, and parts that are difficult to peel off occur locally and float up at an angle, which can cause it to collide with the side walls of the floating dock and cause damage, putting workers at risk. There's a problem.

Furthermore, even when building gravity-type structures using a method other than floating docks, the rubber blocks are pressed against the bottom plate of the formwork by the weight of the concrete, making it difficult to release the mold, making it difficult to install the gravity-type structures in the right place. There is a problem with not being able to move to.

This invention aims to solve the above-mentioned problems and provide a friction member that facilitates floating or mold release of a gravity-type structure even when attached to the bottom of the gravity-type structure.

FIG. 1 shows an example of a caisson 10 used for breakwaters, sea walls, and quay walls. A large number of unit friction members 15 made of rubber are arranged on the lower surface of the concrete frame 11, and the bottom surface of the unit friction members 15 is It protrudes and is buried in the concrete frame 11.

Furthermore, to explain the shape of the bottom surface 16 that contacts the base surface of the unit friction member 15 with reference to FIGS. 2 and 3, a large number of cylindrical protrusions 17 are formed on the bottom surface 16.
This protrusion 17 acts as a supporting leg, and thus fills a gap between the deck of the floating dock or the bottom plate of the formwork and the bottom surface 16 of the unit friction member 15 when the unit friction member is attached to the concrete frame.

Note that the shape of the projections 17 is not limited to a cylinder, but may be other shapes such as a square prism, and the arrangement thereof is not limited to the same row arrangement, but may be a staggered arrangement.

In order to attach the unit friction member with the bottom of the tank as described above to the concrete frame, the foundation bolts 22 are screwed and fixed to the mounting member 21, which is buried integrally with the reinforcing member 20 when the unit friction member 15 is formed, and these unit friction members are fixed. A large number of members are arranged at appropriate intervals.

Next, the reinforcing bars 23 are arranged and concrete I is poured.

When the concrete hardens, the unit friction member becomes completely integrated with the concrete body via the foundation bolts 22.

As is clear from the detailed explanation above, this invention forms a protrusion on the bottom of the unit friction member, so even if the unit friction member is pressed by the weight of concrete, the protrusion acts as a support leg on the bottom of the unit friction member. can maintain a gap.

Therefore, water can be introduced or vented between the bottom surface of the unit friction member and the deck of the floating dock or the bottom plate of the formwork, and uniform levitation of the gravity type structure can be obtained, so that the gravity type structure can be vertically maintained without tilting. It can be floated safely and smoothly in a stable state.

Because the gravity type structure floats reliably, it will not collide with the side wall of the floating dock, damaging the floating dock and the gravity type structure, or endangering the workers.

Furthermore, since it is easy to release the mold from the bottom plate of the formwork, the crane will not be damaged even when the gravity type structure is lifted and floated by a crane.

Furthermore, since it is not necessary to apply a mold release agent to the deck of the floating dock or the bottom plate of the formwork or to spread asphalt felt, it is possible to improve work efficiency.

[Brief explanation of drawings]

Figure 1 is a sectional view showing an example of a friction member according to this invention arranged in a caisson, Figure 2 is a bottom view of a unit friction member, and Figure 3 is a bottom view of a unit friction member.
The figure is a front view showing a cross section of the mounting portion of the unit friction member. 15...Unit friction member, 16...Bottom surface of friction member, 17...Protrusion.

Claims (1)

[Scope of utility model registration request] A friction member for a gravity-type structure, characterized in that a protrusion is formed on the bottom surface of a unit friction member that is buried in a concrete frame with the bottom surface exposed.