JPH0326734B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a weight used for consolidating and leveling underwater rubble foundations to be constructed for installing and fixing structures such as caissons when constructing breakwaters and the like. Regarding.

[Conventional technology]

As this type of weight, a vibratory compaction device is conventionally known, in which a vibrating pile driver is fixed to the head of a hollow casing made of reinforced concrete or steel, and a reinforced concrete shoe is rigidly connected to the lower end (Soviet Transport Published by the Ministry of Construction “TPAHCΠOPTHOE”
``CTPOИTEΛЬCTBO'' December 1973 issue).

[Problem that the invention seeks to solve]

The vibration compaction device mentioned above does not necessarily have sufficient vibration compaction capacity because the shoe at the lower end of the hollow casing is made of reinforced concrete and is weaker than a steel plate.
This causes cracks in the shoe itself, which means that
The same applies to hollow casings, as long as they are made of reinforced concrete.

[Means for solving problems]

The weight for consolidation and leveling of underwater rubble foundations according to the present invention has a supporting frame having a required height corresponding to a structure such as a caisson installed on the underwater rubble foundation, and a plurality of steel supports, beams, and braces. The weight plate at the lower end of the support frame is made of extra-thick steel plate and has multiple steel protrusions for tamping and multiple drainage holes, and the lower end is located in the center of the upper surface of the weight plate. A vibrator is mounted on the upper end of the steel pipe that has been established by fixing it, facing the upper opening of the support frame, and a ventilation hole is provided at the upper end of the steel pipe and a water passage hole is opened at the lower end of the steel pipe. A weight for compacting and leveling underwater rubble foundations.

[Effect]

According to the underwater rubble foundation consolidation and leveling weight of the present invention,
This is erected on the underwater rubble foundation, and the amount of pressure to be compressed and the direction of unevenness at the top end are detected based on the degree of protrusion above the water and the degree of inclination of the support frame, and after the required rough leveling by free fall, the vibration In this case, the support frame is made of assembled steel and has a weight plate made of extra-thick steel plate at the bottom, so the center of gravity is low and stability is high. The above-mentioned compaction pressure performed by standing up can be facilitated and the compaction work can be carried out effectively.

In addition, the support frame is made of assembled steel as described above, has a drainage hole in the weight plate, and has a ventilation hole at the upper end of the steel pipe and a water passage hole at the lower end. In addition, the tamping protrusions perform the necessary tamping without creating buoyancy that would interfere with free fall in water, making it possible to effectively carry out the desired consolidation leveling.

〔Example〕

The weight for consolidation leveling 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 structure such as a caisson 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.

That is, in the consolidation leveling weight a of the present invention, a support frame 1 provided with a scale 3 in the height direction is connected to four supports 4.
Beams 5 and braces 6 are arranged at appropriate intervals and assembled into a prismatic turret shape using shaped steel, and a weight plate 2 is attached to the lower end of the turret shape.
is fixed.

The weight plate 2 is formed into a rectangular shape from an extra-thick steel plate,
Steel protrusions 7 for tamping are arranged in rows at required intervals on the lower surface, and drain holes 8 that penetrate vertically are arranged in a row between the protrusions 7 to reduce resistance during lifting and lowering. , and to prevent small rubble from being blown away by water pressure.

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

9 is a steel pipe whose lower end is fixed to the center of the upper surface of the weight plate 2, and a pair of hanging tools 11, 11 provided on the top plate 10 at the upper end face the upper opening of the support frame 1; A ventilation hole 13 is provided at the upper end and a water passage hole 14 is provided at the lower end to prevent the steel pipe 9 from generating buoyancy.

Reference numerals 15 and 15 denote a pair of electric vibrators, each equipped with a hydraulic chuck 16, 16, which grips the hanging tools 11, 11, and the vibrators 15, 15 By hanging the connected wire rope 17 on the hook 18 of the crane, this consolidation weight a can be lifted or lowered, and the vibration machines 15 and 15 give vibration to the weight plate 2 via the steel pipe 9. It is something that can be done.

19 is the power cable and chuck 1 for the vibrator
This is an oil pipe for 6 and 16.

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 crown are displayed with a little margin from the planned width using the flagpole 20, and while making necessary inspections, the excess or deficiency of rubble is adjusted to confirm that the crown is slightly higher than the planned height.

Moreover, the crane hook 18 of the crane ship
A weight a suspended by a wire rope 17 is lowered onto the underwater rubble foundation, and depending on the degree of protrusion above the water and the degree of inclination of the supporting frame 1, the amount of pressure to be compressed at the top (higher than the planned height) and unevenness are determined. Detect the direction and use the weight a
The material is moved up and down, that is, hoisted to a required height and allowed to fall freely, as many times as required, and then roughly leveled to the extent that the weight a does not wobble excessively when the material is erected.

Next, the surveyor 23 uses a surveying instrument 22 installed at a fixed point, for example, an existing caisson 21, 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 numerical value, the operator applies vibration to the hanging weight plate 2 while adjusting the lifting height of the weight a to make the top end pressurized, and then measures the top pressured height again and makes a plan. By further compressing and compacting until the height is reached, and continuing to perform the above operations thereafter, the top surface of the underwater rubble foundation can be consolidated and leveled to the planned height.

In addition, in this example, the support frame is prismatic,
Although the case where the weight plate is formed into a rectangular shape is shown, the supporting frame and the weight plate are not limited to the above-mentioned shapes, and for example, the supporting frame may be formed into a cylindrical shape and the weight plate may be formed into a circular shape.

Further, the scale scale may not be separate from the support frame, but the scale may be directly displayed on a required portion of the support.

〔Effect of the invention〕

According to the consolidation and leveling weight of the present invention, since the support frame has a height corresponding to a structure such as a caisson installed on the underwater rubble foundation, the degree of protrusion above the water and the inclination when erected on the foundation are This makes it possible to detect the amount of pressure to be compressed at the top and the direction of unevenness.Furthermore, the support frame is made of assembled steel and has a weight plate made of extra-thick steel plate fixed to the lower end, so the center of gravity is low and stability is high. Because it is high, it is possible to perform compaction by standing on the top of the tower and to effectively carry out the compaction work.

In particular, as mentioned above, the weight plate is made of extra-thick steel plate, so it is highly durable, and it 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. It is.

In addition, the support frame is made of assembled steel as described above, and the weight plate has a drainage hole, and the steel pipe has a ventilation hole at the upper end and a water passage hole at the lower end, so these The tamping protrusions perform the necessary tamping without producing any buoyancy that would impede free fall in water during leveling, so that the desired consolidation leveling can be carried out effectively.

Furthermore, the water drain hole can prevent small rubble from flying away due to water pressure, especially when the weight plate lands on the ground during free fall of the device.

[Brief explanation of the drawing]

Figures 1 and 2 are a perspective view and a front view of the consolidation and leveling weight of the present invention, Figure 1 shows the vibrator removed, and Figure 2 shows only the weight plate cut away. FIG. 3 is an explanatory diagram of the implementation status of consolidation leveling using the above-mentioned weight. 21... Caisson, 1... Support frame, 2... Weight plate,
4... Support column, 5... Beam, 6... Bracing, 7... Projection, 8... Water drain hole, 9... Steel pipe, 15... Vibrator, 13... Ventilation hole, 14... Water hole.

Claims (1)

[Claims] 1 A support frame having the required height corresponding to a structure such as a caisson to be installed on the underwater rubble foundation is assembled into a tower shape by multiple steel supports, beams, and braces, and the support frame The weight plate at the lower end is made of extra-thick steel plate and has multiple steel protrusions for tamping and multiple drainage holes, and the upper end of the steel pipe was established by fixing the lower end to the center of the top surface of the weight plate. An underwater rubble foundation consolidation leveling device, characterized in that a vibrator is mounted on the upper opening of the support frame, and a ventilation hole is provided at the upper end of the steel pipe and a water passage hole is opened at the lower end of the steel pipe. Useful weight.