JPS6053125B2 - Sheet for stabilizing the base of underwater structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an underwater structure that is installed at the base of an underwater structure such as a caisson, and that prevents the underwater structure from sinking or tilting due to scour of the underwater ground by water currents, waves, etc. Regarding the improvement of the base stabilization sheet for underwater structures, a steel pipe is attached to the free end of the flexible sheet laid at the base of the underwater structure, and a perforated pipe is attached to the free end of the flexible sheet laid at the base of the underwater structure. It is characterized by being made by connecting the following, and its purpose is to
An improved underwater structure that has a simple configuration and prevents the scouring of the lower part of the free end of the sheet, which is caused by waves and shaking caused by water current, of the free end projecting from the periphery of the base of the underwater structure. The purpose of this invention is to provide a sheet for stabilizing the base of an object.

As described above, the stabilizing sheet according to the present invention is attached to perforated pipes such as perforated steel pipes and perforated concrete pipes through cables inserted through steel pipes attached to the ends of the flexible sheet main body. Since the sheets of the present invention are connected so as to be swingable, when the sheet of the present invention is laid at the base of an underwater structure, earth and sand are first poured from the bottom into the hollow part of the perforated tube at the end of the sheet that protrudes from the periphery of the base. As the water enters and accumulates, its weight increases and it sinks into the underwater ground. As this sedimentation progresses, surrounding earth and sand and drifting sand enter from above, and the perforated pipe is buried in the underwater ground along with the sand. By communicating the earth and sand in the ground with the earth and sand in the perforated pipe, an anchor part is formed in which the underwater ground and the perforated pipe are integrated, and thus the perforated pipe is firmly anchored to the underwater ground. be done. As a result, the free end of the sheet is held stable on the underwater ground. Therefore, the free end of the sheet protruding from the periphery of the base of the underwater structure is prevented from swinging due to water currents and waves, and the ground beneath the free end of the sheet is prevented from being scoured due to this swinging, thereby reducing the bearing capacity of the ground. Uneven subsidence of underwater structures due to uneven settling is prevented. When a heavy object is attached to the end of the sheet as an anchor, it is impossible for the anchor to be deeply buried in the soil of the underwater ground due to scour, and the intended purpose of the anchor cannot be fully achieved. However, in the present invention, the perforated pipe serving as the anchor is connected to the steel pipe at the free end of the seat body via a flexible rope, so the perforated pipe can be easily inserted into the earth and sand at the bottom of the water. It can be deeply buried and create an anchor effect. In addition, at this time, since the connecting cables of the perforated pipes are inserted and connected to the end steel pipes of the seat body, when tension is applied to the cables due to the burial of the perforated pipes, the seat body is free to move. The present invention has many advantages, including the fact that the ends are not sheared. The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a sheet body made of a vinyl chloride sheet or the like for stabilizing the base of an underwater structure. Steel pipes 2 arranged at a required interval are wound around the ends of the sheet body, and the wound ends 1a are wound around the ends of the sheets. A steel pipe 2 is attached to the free end of the seat body 1 by welding to the seat body 1. 3 is a large number of through holes 3
This is a perforated steel pipe having a diameter of 1.a, and is connected to the steel pipe 2 via a cable 4 made of polypropylene or the like that is inserted through the steel pipe 2.

The sheet for stabilizing the base of an underwater structure constructed as described above is laid at the base of an underwater structure A such as a caisson, and the sheet main body 1 protrudes from the periphery of the base of the structure A. The steel pipe 3 first enters the perforated steel pipe 3 connected to the steel pipe 2 at the free end via the cable 4 from the lower part through the through hole 3a and accumulates inside the perforated steel pipe 3.
will settle naturally, and with this settling, surrounding earth and sand and alluvial sand will enter from above, and the perforated steel pipe 3 will sink to the water bottom ground B along with the sand.
The anchor part is constructed by integrating the underwater ground B and the perforated steel pipe 3 by embedding the earth and sand in the ground B and the earth and sand in the perforated steel pipe 3, and the sheet body 1 is held in a stable state on the underwater ground B.

As a result, the free end of the sheet body 1 is prevented from swinging due to waves and water currents, and the inclination of the underwater structure A due to uneven settlement due to scouring of the earth and sand of the underwater ground B below the free end is prevented.
This is to prevent subsidence.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an embodiment of the sheet for stabilizing the base of an underwater structure according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a longitudinal cross-sectional view showing its usage state, and Fig. 4 is a partially enlarged view. 1... Seat body, 2... Steel pipe, 3.
...Perforated steel pipe, 3a...Through hole, 4...
... cable.

Claims (1)

[Claims] 1 A steel pipe is attached to the free end of a flexible sheet body laid at the base of an underwater structure, and a perforated pipe is connected via a cable inserted into the steel pipe. Sheet for stabilizing the base of underwater structures.