JPS624487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wide-scale sunken structure installed on soft ground such as the seabed and used as the base of a port structure or the like.

Modern port structures are often planned to be constructed on soft ground, and construction methods are used to improve the soft ground, such as silt clay, prior to construction.

Conventional improvement methods include a sand drain, in which a sand pillar is driven into soft ground, a load is applied from above, water is drained from the soil through the sand pillar, and the ground is consolidated and strengthened; The method used was to dig the floor and replace the area with sand, etc., to strengthen the ground.

However, since conventional methods involve large-scale ground improvement, the improvement method itself requires a long period of time. Furthermore, construction using these methods requires a large amount of high-quality sand. In view of the recent situation where it has become difficult to obtain high-quality sand, etc., there has been a need to reduce the amount of these materials used.

The present invention solves the above problems and provides a wide-scale sunken bed structure that can be installed on soft ground without extensive ground improvement, has a sufficient function as the base of a port structure, etc., and is easy to construct. The purpose is to provide something.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 3, reference numeral 1 denotes a sunken structure constructed by connecting a plurality of blocks 2 each having a truss structure on the top.

As shown in Fig. 3, the block 2 is made of concrete, has a trapezoidal cross-section, has a truss frame 3 forming a truss structure at the top, and has a plurality of communicating holes along the longitudinal direction of the block 2. 4 is drilled. A rigid wire 5 such as a wire is inserted through each communication hole 4, and a plurality of blocks 2 are connected along the longitudinal direction to form a series of blocks.

It goes without saying that the truss structure of the block 2 is not limited to the illustrated example and can have various shapes. Moreover, the shape and size of the block 2 can of course be changed depending on the purpose and location of use.

The blocks 2 constructed in this manner are manufactured individually, and at the site of use, a plurality of blocks are arranged in parallel in a predetermined length in the longitudinal direction, and the wires 5 are inserted through the communication holes 4 of each block 2 to form a predetermined length. A series of block rows are formed by connecting the blocks so as to have a truss length. The predetermined length of the transformer may be a length that does not cause large arcuate sliding on the soft ground A.

Next, as shown in FIG. 3, a series of block rows are sequentially arranged in strips at appropriate intervals on the soft ground A, and the superstructure 6 to be constructed is constructed in the upper direction of the block row. The blocks are installed along the line 6a so that the axis of the block row is perpendicular to the normal line 6a. As a result, a sunken bed structure 1 is formed.

After that, rubble sections 7, 7' made of rubble or filler sand, etc. and a cut-out section 8 are buried in the upper part of the sunken bed structure 1, and an upper structure 6 such as a caisson or block is installed on top of these sections to form a port. A construct will be formed.

By using the sunken bed structure according to the present invention, the following functions and effects can be obtained.

Since the sunken bed structure according to the present invention has a wide scale, it can prevent large arcuate slips on soft ground, and also support the port structure itself against local subsidence of soft ground with the sunken bed structure over a wide range. This can prevent local subsidence of port structures.

In addition, sunken bed structures are formed by assembling blocks pre-formed from concrete or the like at the site of use, so they can be constructed extremely quickly and easily on soft ground.
Compared to conventional soft ground improvement methods of similar scale, construction costs can be significantly reduced.

As described above, the sunken bed structure according to the present invention has great practicality.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a port structure using an embodiment of the sunken bed structure of the present invention. FIG. 2 is a perspective view of blocks forming the sunken bed structure. FIG. 3 is a sectional view taken along the line -- in FIG. DESCRIPTION OF SYMBOLS 1...Sunk bed structure, 2...Block, 4...Communication hole, 5...Striation, 6...Superstructure, 6a...
Normal, A...Soft ground.

Claims (1)

[Claims] 1 A plurality of blocks having a truss structure on the upper part and having a plurality of communication holes bored along the longitudinal direction are arranged at a predetermined length in the longitudinal direction, and the plurality of communication holes of each block are arranged at a predetermined length in the longitudinal direction. Rigid wires are passed through the holes and connected to form a series of block rows, which are directed along the normal of the superstructure to be constructed in the upper direction of the block rows and along the A sunken bed structure characterized by being installed in strips at appropriate intervals so that the axis of the rows is perpendicular to the normal line.