JPS599696B2 - Ten-leveling method for underwater rubble mounds - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a warm pressure leveling method for submerged rubble mounds in which caisson or blocks are installed, and its purpose is to level the mound by moving up and down with a weight suspended from a crane. To easily and accurately level out the weight of the mound while checking the unevenness of the top of the mound and measuring the height of the top, and to make a solid underwater rubble mound.

Therefore, in order to achieve the above object, the present invention forms a mound with a crown slightly higher than the planned height by inserting rubble, and then creates the required structure corresponding to a structure such as a caisson to be installed on top of the mound. The above-mentioned mound warm-pressure work is carried out by moving a weight body, which has a weight plate made of extra-thick steel plate at the lower end of a tall steel assembly support, up and down while suspended from a crane, and The above-mentioned weight body is suspended and stood upright, and the direction of unevenness of the top of the mound is detected by its inclination, and the height of the top of the mound is measured using a surveying instrument installed at a fixed point such as an existing caisson. The measurement work was repeated as appropriate to finish the top end at the planned height, and an example will be specifically described below.

First, the weight a has a required height that corresponds to the structure such as a caisson that is to be installed, and more specifically, the required height that corresponds to the size and shape of the structure, as well as the water depth at the top of the mound. It consists of a steel assembly support frame B with a height of , and a weight plate C made of extra-thick steel plate fixed to the lower end of the frame B.

The above-mentioned steel assembly support frame b has four steel supports 1 arranged at related positions corresponding to each corner of a square plane, and a plurality of steel beams 2 and steel braces 3 as appropriate between each of the steel supports 1. It is assembled by tensioning, and the outer surface of each steel support column 1 is marked with a scale 4 graduated in units of 1cIfL starting from the bottom surface of the weight plate C, and a weight body a is placed at the top of the mound. When erected, at least the upper portion of the scale 4 is positioned above the water surface.

In addition, the weight plate C has a plurality of steel protrusions 5 arranged at required intervals on the lower surface of a square-shaped extra-thick steel plate, and a plurality of steel protrusions 5 penetrating the upper and lower surfaces between the protrusions 5. A water drain hole 6 is provided.

By inserting the required rubble, a mound e is formed with its top a little higher than the planned height, and the positions on both sides of the top are displayed with a flagpole 7 with a little more margin than the planned width. After making the necessary measurements and adjusting the excess and deficiency of rubble to confirm that the top was slightly higher than the planned height, the weight a suspended from the crane of the crane ship with a wire 8 was placed on top of the mound e. The amount of pressure to be applied at the top (higher than the planned height) and the direction of the unevenness are detected based on the degree of protrusion above the water and the degree of inclination of the steel assembly support frame b, and the weight body a is slightly moved up and down. Roughly level the surface to the extent that the weight a does not wobble.

After that, the surveyor 9 checks the fixed point, for example, the existing caisson d.
Measure the height of the crown by reading the scale 4 displayed on the steel support 1 of the weight a suspended above the crown using a measuring instrument 10 installed at Inform the crane ship operator of the numerical value using a transceiver, etc.

Based on this value, the operator adjusts the lifting height of the weight a, that is, the free fall distance, and then lifts the weight a and performs the free fall, that is, vertical movement the required number of times to apply yoke pressure to the top. Depending on the degree of yoke pressure, the above-mentioned free fall distance is further adjusted by measuring the top height with the above-mentioned surveying instrument 10 and scale scale 4, and based on the result, the vertical movement of the weight body a is again adjusted. By repeating the plate pressure work and inspection work as appropriate, the top of the mound e can be finished horizontally to the planned height.

In this embodiment, the steel assembly support frame b of the weight body a and the steel plate weight plate C have a square planar shape, but are not limited to this, but may have a circular planar shape, for example.

As is clear from the above description, according to the present invention, the weight body that moves up and down while suspended from a crane to level the net pressure of the mound is attached to a structure such as a caisson that is to be installed on the mound. Since it has a steel assembly support frame with a required height corresponding to the body, when the weight body is suspended and erected on the mound, the height of the top pocket is determined by the degree of protrusion above water and the degree of inclination of the steel assembly support frame. Detect and confirm the amount of pressure to be applied and the direction of unevenness,
In addition, while measuring the height of the crown with a surveying instrument on a fixed point,
It is possible to easily and accurately level the net pressure until it reaches the planned height.

In addition, since the above-mentioned weight body is made of a weight plate made of extra-thick steel plate at the lower end of the steel assembly support, the center of gravity is low and stability is improved, so vertical movement when suspended is smooth. Moreover, it is extremely effective because the pressure is applied directly by the impact of the weight plate.

Moreover, according to the present invention, the work of forming a mound at the top slightly higher than the planned height by introducing rubble, the work of applying pressure using the above-mentioned weight suspended from a crane, and the surveying instrument installed at a fixed point are performed. Measuring the height of the crown using a mechanical process that can be operated on water makes it easy to construct an underwater rubble mound with a horizontal and solid top that is necessary for installing structures such as caissons. At least with regard to each of the above tasks, the advantage of not requiring manual labor by divers is remarkable in that it is not affected by water pollution, waves, water depth, etc. Therefore, it is useful for shortening the construction period and reducing construction costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory view of the construction situation, and FIGS. 2 and 3 are a side view and a perspective view of the weight body. e...mound, d...caisson, b...steel assembly support frame, C...weight plate, 10...surveying instrument.

Claims (1)

[Claims] 1 A mound at the top slightly higher than the planned height is formed by inserting rubble, and an extra-thick steel plate is placed at the lower end of the steel assembly support with the required height to correspond to the structure such as a caisson to be installed on top of the mound. The above-mentioned mound marking work is carried out by moving a weight body provided with a weight plate made of aluminum up and down while suspended from a crane, and the above-mentioned weight body is suspended and erected on the mound. In addition to detecting the unevenness direction of the top of the mound based on the degree of inclination, the height of the top of the mound is repeatedly measured using a surveying instrument installed at a fixed point such as an existing caisson. A high-pressure leveling construction method for underwater rubble mounds that is characterized by finishing the top to the planned height.