JPH0326733B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a weight used to consolidate and level underwater rubble foundations to be constructed for installing and fixing structures such as caisson when constructing breakwaters, etc. Regarding.

[Conventional technology]

Conventionally, as this type of weight, a vibrating pile driver is fixed to the head of a hollow casing made of reinforced concrete or steel, and a vibrating compaction device ("TPAHCΠOPTHOE" published by the Ministry of Transport and Construction of the Soviet Union) is constructed by rigidly connecting a reinforced concrete shoe to the lower end. CTPOИTEΛЬ
CTBO (December 1973 issue), or a bell-shaped weight for compacting by free falling (Shukyosha Co., Ltd., November 15, 1952 issue, "Minato Jiron") are known.

[Problem that the invention seeks to solve]

The above-mentioned vibratory compaction equipment generates buoyancy in the hollow casing and cannot sufficiently transmit the excitation force of the vibrating pile driver to the underwater rubble foundation.Also, the foot at the lower end of the hollow casing is made of reinforced concrete and is fragile. The compaction capacity is not always sufficient, and cracks can develop in the shoe itself, especially after repeated use over a long period of time.This also applies to hollow casings, as long as they are made of reinforced concrete. I can say that.

In addition, the above-mentioned bell-shaped weight is inconvenient to measure and set its free fall distance (height), and
It cannot be used to directly understand the unevenness and inclination of the top surface of the underwater rubble foundation at the location of the fall.
The present invention seeks to solve these problems.

[Means for solving problems]

The underwater rubble foundation consolidation and leveling weight of the present invention is an underwater rubble foundation consolidation weight that is equipped with a weight plate at the lower end of a supporting frame having a required height corresponding to a structure such as a caisson installed on the underwater rubble foundation. In the leveling weight,
The above-mentioned support frame is assembled into a tower shape with a plurality of steel supports, beams, and braces, and the weight plate is made of extra-thick steel plate, and a plurality of steel protrusions for tamping and a plurality of steel protrusions are attached to the weight plate. It is equipped with drainage holes.

[Effect]

According to the underwater rubble foundation consolidation and leveling weight of the present invention,
This is a device that can consolidate and level the top of the underwater rubble foundation by repeating free falls by monitoring the protrusion of the support frame above the water and its inclination and adjusting the falling distance and position as appropriate. Because it is assembled in a tower shape with braces and has a sinker-shaped drainage hole, there is no buoyancy that would hinder free fall into the water, and the tamping protrusions provide the necessary tamping. Therefore, the desired consolidation and leveling can be carried out effectively.

〔Example〕

The consolidation and leveling weight of the present invention is designed to suit the leveling width of the top of the underwater rubble foundation, the shape or dimensions of the caisson or other structure to be installed, the water depth, the capacity of the crane ship, etc. It is manufactured in advance at a caisson yard or the like using thick steel plates or the like.

This consolidation leveling weight a has a weight plate 2 fixed to the lower end of a support frame 1, and a scale 3 that runs in the height direction of the support frame 1 at a desired location. The support frame 1 is made up of four supports 4, beams 5 and braces 6 arranged at appropriate intervals, and assembled with shaped steel into a prismatic tower shape, and a weight plate 2 is fixed to the lower end of the support frame 1.

The weight plate 2 is formed into a rectangular shape from an extra-thick steel plate,
Steel protrusions 7 for tamping are arranged in a row at required intervals on the lower surface, and drain holes 8 penetrating from the lower surface to the upper surface are arranged in a row between the protrusions 7 to reduce resistance during hanging. This reduces the amount of debris and prevents small rubble from being blown away by the water pressure.

The scale 3 is manufactured separately from the support frame 1 and has a scale of 1 cm starting from the bottom of the weight plate 2, and when it is lowered to the top of the underwater rubble foundation, at least the upper It is attached to the outer surface of each of the pillars 4 so as to protrude from the water surface.

9 is a hanging tool attached to the four corners of the upper end of the support frame 1;
It is used to hang a wire rope for hanging by a crane.

Consolidation and leveling of the underwater rubble foundation using the weight a having the above configuration is carried out as follows.

First, by adding the required amount of rubble, we will form an underwater rubble foundation with the top slightly higher than the planned height. After that, the positions on both sides of the top are displayed with a flagpole 10 with a little extra margin than the planned width, and while performing necessary inspections, the excess or deficiency of rubble is adjusted to confirm that the top is a little higher than the planned height.

Then, a weight a suspended by a wire from a crane on a crane ship is lowered onto the underwater rubble foundation. ) and the direction of the unevenness, hoisting the weight a to a required height and letting it fall freely is repeated the required number of times, and rough leveling is performed to the extent that the weight a does not wobble excessively when raised.

Next, the surveyor 13 uses a surveying instrument 12 installed at a fixed point, for example, an existing caisson 11, to read the scale scale 3 displayed on the support 4 of the plumb a, which is suspended and erected above the crown. Measure the height and notify the crane ship operator of the exact value to be filled using a transceiver.

Based on the value, the operator adjusts the lifting height of the weight a, that is, the free fall distance, lifts the weight a and moves it up and down, that is, moves it up and down the required number of times to tamp down the top, and then adjust the height according to the degree. Further, the above-mentioned free fall distance is adjusted by measuring the top height using the above-mentioned surveying instrument 12 and scale scale 3, and based on the result, tamping is performed again by the free fall of the weight a. By appropriately repeating the tamping work and measurement work, the underwater rubble foundation can be consolidated and leveled to the planned height.

In this embodiment, the support frame 1 and the weight plate 2 are square in plan, but are not limited to this.
For example, it is obvious that it may be circular in plan.

〔Effect of the invention〕

The consolidation and leveling weight of the present invention has the following effects.

Since the support frame has a height corresponding to the structure such as a caisson installed on the underwater rubble foundation, the amount of pressure to be compressed and the unevenness of the top will depend on the degree of protrusion above the water and the degree of inclination when erected on the foundation. The direction can be detected, and the height of the top can be easily measured as needed by using the scale scale provided at the required part of this support frame with the bottom of the weight plate as the starting point. The free fall distance can be adjusted accordingly.

Since the support frame is made of assembled steel and the weight plate has a drainage hole, there is no buoyancy that would interfere with free fall even in water. It can prevent small rubble stones from flying away, and its weight plate is made of extra-thick steel plate, so the center of gravity is low and stability is high, so consolidation work by free fall can be carried out effectively.

As mentioned above, the weight plate is made of extremely thick steel plate, so it is highly durable, and is not as brittle as those made of reinforced concrete, so it is suitable for repeated use over a long period of time and is easy to manufacture.

[Brief explanation of the drawing]

Figures 1 and 2 are a perspective view and a front view of a weight for consolidation and leveling according to the present invention, and Figure 3 is an explanatory view of the state of implementation of consolidation and leveling using the weight. 11... Caisson, 1... Support frame, 2... Weight plate,
4... Support, 5... Beam, 6... Bracing, 7... Projection, 8... Drain hole.

Claims (1)

[Claims] 1. In a weight for consolidation and leveling of underwater rubble foundations, which is equipped with a weight plate at the lower end of a support frame having the required height corresponding to a structure such as a caisson installed on the underwater rubble foundation, the above-mentioned support frames are It is assembled into a turret-like structure with steel supports, beams, and braces, and the weight plate is made of extra-thick steel plate and is equipped with multiple steel protrusions for tamping and multiple drainage holes. A weight for compacting and leveling underwater rubble foundations.