JPS6053124B2 - 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 a sheet for stabilizing the base of an underwater structure, a perforated tube is fitted into an annular part having a large number of through holes wound around the free end of a flexible sheet laid at the base of an underwater structure, It is characterized by communicating the through hole of the pipe with the through hole of the annular part, and its purpose is to be easy to manufacture and to protrude from the periphery of the base of the underwater structure in the sheet. An object of the present invention is to provide an improved sheet for stabilizing the base of an underwater structure, which prevents earth and sand from scouring the free end of the free end due to waves and shaking due to water flow.

As described above, the stabilizing sheet according to the present invention has an annular portion having a large number of through holes formed at the end of the flexible sheet body, and a perforated steel pipe or a perforated concrete pipe or the like in the annular portion. Since the pipe is fitted and the through hole of the perforated pipe and the through hole of the annular part are communicated with each other, when the sheet of the present invention is laid at the base of an underwater structure, the sheet protrudes from the periphery of the base. Sediment initially enters the perforated pipe at the end of the sheet from the lower part through the through hole and the through hole of the annular part in which the perforated pipe is fitted, and accumulates in the hollow part of the perforated pipe. As a result, the perforated pipe sinks naturally, and as this sedimentation progresses, the surrounding earth and sand enters from above, and the perforated pipe is buried in the water bottom ground along with the sand. The communication between the earth and sand in the perforated pipe forms an anchor part in which the water bottom ground and the perforated pipe are integrated, and as a result, the free end of the sheet remains stable on the water bottom ground. Retained. 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. Conventionally, when manufacturing this type of sheet, a pipe is inserted from the side into the annular part that is bent around the free edge of the sheet on-site, and then the sheet annular part with the pipe fitted is attached to a support assembled on-site. Concrete was put into the pipe by leaning it against the frame, but when the finished product was lifted it was 9th at 500 per TrL, and the self-weight of the normally used 6TrL width sheet was 3 to 3.
4 and the work was difficult.

However, according to the present invention, it is only necessary to fit a perforated steel pipe into the annular portion having a large number of through holes wound around the end of the sheet body, which simplifies the field work. The present invention has many advantages, such as being a locking part for ropes and laying fittings, allowing diving workers to easily carry out laying work. The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a sheet main body for stabilizing the base of an underwater structure made of a vinyl chloride sheet or the like, which has an annular portion 2 having a large number of through holes 2a at its edge, which is wound around an end piece 2b of the annular portion.
is welded to the seat body 1.

A perforated steel pipe 3 is fitted into the annular portion 2, and the through hole 3 of the steel pipe 3 is inserted into the annular portion 2.
A and the through hole 2a are overlapped to form a sheet for stabilizing the base of an underwater structure.

The sheet constructed as described above is laid at the base of an underwater structure A such as a caisson, and the free ends of the sheet body 1 protruding from the periphery of the base of the underwater structure A are Sediment 4 first enters the perforated steel pipe 3 from the lower part through the holes 2a and 3a and accumulates inside the perforated steel pipe 3, causing the steel pipe 3 to settle naturally, and as this sedimentation progresses, As a result, surrounding earth and sand and drifting sand enter from above, and the perforated steel pipe 3 is buried in the water bottom ground B together with the sand, and the earth and sand in the ground B and the earth and sand in the perforated steel pipe 3 communicate with each other, so that the perforated steel pipe 3 is buried in the water bottom ground B. An anchor part is formed that is integrated with the ground B, and the end of the sheet body 1 is firmly anchored to the underwater ground B. As a result, the end of the sheet main body 1 is held stably on the underwater ground A. be done.

In this way, the free end of the sheet body 1 is prevented from shaking due to waves and water currents, and the inclination and subsidence of the underwater structure A due to uneven settlement due to scouring of earth and sand in the underwater ground B below the free end are prevented. It is something that will be done.

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 perspective view showing an embodiment of the sheet for stabilizing the base of an underwater structure according to the present invention, Fig. 2 is a longitudinal cross-sectional side view thereof, and Figs. 3 and 4 are longitudinal cross-sectional views showing its usage state. FIG. 1... Woot body, 2... Annular part, 2a
...Through hole, 3...Perforated steel pipe, 3a...
...Through hole.

Claims (1)

[Claims] 1. Fit a perforated pipe into an annular part having a large number of through holes, which is bent at the free end of a flexible sheet laid at the base of an underwater structure, and connect the through holes of the pipe with the annular part. A sheet for stabilizing the base of an underwater structure, characterized by being formed by communicating through holes.