JPS6210329A - Method and apparatus for tamping and leveling underwater rubble mound by hammer striking method - Google Patents

Abstract

PURPOSE:To enhance the efficiency and safety of tamping and leveling work for underwater rubble-mound by a method in which the top end of underwater rubble-mound is graded to a level higher than a design height and struck by a tamping and leveling machine having a striker, e.g., hammer, etc. CONSTITUTION:A tamping and leveling machine consisting of a support frame 1 and a tamping plate 2 is attached through a guide 7 to the leader of a pile driving ship 10. The machine is set on the top end of an underwater rubble- mound graded to a level higher than a design height. The top end is the rubble mound is compacted and leveled by a Diesel hammer or an oil-pressure hammer 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for leveling underwater rubble foundations using hammer percussion type compaction, which performs underwater top leveling and compaction of basic rubble stones such as caissons or blocks for breakwaters and seawalls. and related to rolling pressure leveling equipment.

Conventionally, leveling the top of underwater rubble foundations relied on manual work by divers, but this was inefficient and unsafe, and did not require compaction.
Depending on the ground conditions, the caissons or blocks had the disadvantage of sinking after completion.

In the present invention, the top surface of the underwater rubble foundation is compacted and leveled using the impact energy of a diesel hammer, drop hammer, hydraulic hammer, etc., and the construction height of the top surface is adjusted to the level above the water. The leveling rod of the rolling compaction leveling device is read from the level installed on the existing structure, etc. and finishes to a predetermined height, and can be expected to be efficient, safe, uniform in finishing, and effective in compaction.

Next, the rolling leveling device of the hammer impact type rolling leveling method of the present invention will be explained.

As shown in Figures 1 and 2, this device consists of a supporting frame ■ and a rolling plate ■.
It consists of

The support frame ■ has a height that reaches the top surface of the underwater rubble foundation from above the water, and also serves as a guide for the drop hammer when the drop hammer shown in Figure 1 is used, and it also serves as a guide for the drop hammer as shown in Figure 3. When using (2), the impact energy of the hammer is transmitted to the rolling plate (2).

By setting the guide fitting ■ to the leader of a commonly used pile driver, it is possible to prevent the device from tipping over and easily solve conditions where it is difficult to set it in the rolling and leveling position due to tidal currents, etc. be.

The main unit lifting fitting (■) is used to lift the main unit when setting the device in a predetermined position.

The shape of the compaction plate ■ is determined according to the construction conditions, such as the top of an underwater rubble foundation, and it is made of extremely thick steel plate that will not deform even when hit by a hammer.

The reinforcing plate ■ is a reinforcing plate for preventing deformation of the rolling plate ■.

Next, the construction method of the present invention, which is carried out using the rolling pressure leveling device having the above configuration, will be explained.

As shown in Fig. 3, the rolling pressure leveling device of the present invention
The installation method is to install a rolling leveling device on the top surface of the underwater rubble foundation, which is shaped higher than the planned construction height of the underwater rubble foundation, using a guide ■ to the leader, and to perform rolling leveling to the planned height by hitting with a hammer. be.

Depending on the execution conditions at the work site, it is decided whether to use a diesel hammer or a hydraulic hammer.Also, when using the drop hammer shown in Figure 1, the drop hammer ■
It is lifted from a predetermined height using a crane hook via a lifting wire and dropped from a predetermined height, and the impact energy is used to flatten the surface. Rolling and leveling is performed until then.

As described above, according to the present invention, all work can be done on the water, and the rolling leveling can be done mechanically.Also, since the impact energy of the hammer is used, the rolling leveling device can be used. Due to the reduced weight, construction can be carried out even by a piling ship with a small capacity, which can also be expected to shorten the construction period and reduce construction costs.

[Brief explanation of drawings]

FIG. 1 is a front view of the rolling and leveling device according to the present invention when equipped with a drop hammer. FIG. 2 is a plan view of the same as above. FIG. 3 shows an embodiment of the method of the present invention when equipped with a diesel hammer or a hydraulic hammer. 1... Support frame 2... Rolling plate 3... Reinforcement plate 4... Drop hammer 5... Drop hammer lifting wire 6...
... Crane hook 7 ... Guide fitting 8 ... Lifting tool for lifting the main body 9 ... Diesel hammer or hydraulic hammer 1
0...Pile driving boat

Claims (2)

[Claims] (1) The top surface of the underwater rubble foundation, which has been shaped to be higher than the planned height, is struck with a compaction leveling device equipped with a striking device such as a diesel hammer, drop hammer, or hydraulic hammer, and the impact energy of the hammer is used to Underwater rubble foundation leveling method characterized by compaction and leveling of the top. (2) It is characterized by consisting of a support frame having a height that reaches the top surface of the underwater rubble foundation from above the water, a compaction plate fixed to the lower end of the support frame, and a striking device that applies a blow to the compaction plate. Rolling pressure leveling device