JPH0342105Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to point structures in underwater structures.

``Conventional technology'' In underwater structures such as sea berths and dolphins, underwater welding was initially used to construct underwater structures, but a. Welders with special skills were required.

b. Highly reliable strength cannot be obtained.

c Construction takes a long time.

Due to the following reasons, bolts were used to connect the bolts, but they often loosen due to the repeated force of waves.

b There is a risk of fracture due to crevice corrosion unless special anti-corrosion treatment is applied.

For these reasons, it is difficult to adopt each of them, and as a different point structure that does not have the above-mentioned difficulties, an extrapolated short pipe is fixed to the underwater part of a support (for example, a steel pipe pile) cast in the water using cement mortar. For example, the special public works of Sho
It has been proposed in Japanese Patent Publication No. 56-34692, Japanese Patent Publication No. 60-3572, Japanese Patent Publication No. 60-20528, etc.

In this structure, the short outer tube is suspended with a wire rope and held at a predetermined position in the middle of the column, and in this state, the upper and lower ends of the gap between the column and the short tube are After sealing is achieved by supplying pressurized air or explosively expanding the diameter of a rubber tube or explosive welding tube that has been set in advance on the inner periphery, the gap is injected and filled with cement mortar, resulting in a strong structure. It is excellent in that it can form points reliably.

``Problems that the invention seeks to solve'' However, with the method described above, it is extremely troublesome to hold the short extrapolation tube in a predetermined position in the middle of the column with a wire rope, and the sealing process is unnecessarily difficult. Considering these circumstances, there are difficulties in terms of cost and workability.

``Means for solving problems'' and ``effects'' This was done in view of the serious circumstances of the case, and its gist is to install half-split annular supports at appropriate locations on pillars cast in water. Temporarily fix it, place the short outer tube on top of it, fill the gap created by the placing part with cloth, sand, gravel, etc. In this state, close the gap between the support and the short outer tube. The short outer tube is fixed to the support by filling it with cement mortar, and the positioning and holding of the short outer tube as well as the sealing are greatly simplified and the workability is improved.

"Example" This will be explained in detail below based on the drawings.

FIG. 1 is an overall view of an underwater structure in which a fixed point is formed according to the present invention, and in the figure, 1 is a column, 2 is a brace material, 3 is a support, and 5 is an extrapolated short pipe.

In this case, first, the support 3 is temporarily fixed to a predetermined location of the support 1 that has been cast in the water in advance, but the support 3 is formed into a half ring shape so that it can be easily attached to the support 1. ing.

That is, FIG. 2 is a plan view of the support 3,
Further, in FIG. 3, the support body 3 is viewed from the front, and the support body 3 has half plates 7, 7 having radial ribs 6 protruding from the back surface, and one side of which is joined by a hinge 8, and the other side is connected by a hinge 8. Although it is designed to be fastened with bolt 9, the other side may be fastened by clamping it with a drive-in metal fitting instead of being fastened with a bolt, or one side may not be hinged and fastened with a bolt, etc. in the same way as the other side. I don't mind.

Temporary fixing of the support 3 can be ensured by tightening and fixing the support 3 having an inner diameter slightly smaller than the outside diameter of the support 1 to the outer periphery of the support 1, but this is not limited to this. In the case of a pile, the support 3 having an inner diameter slightly larger than the outside diameter of the pile is extrapolated onto the pile and lowered, and the support 3 is tilted at a predetermined position so that its rib 6 frictionally engages with the outer periphery of the pile and stops. You can also do this.

In the case of the above-mentioned tightening and fixing, a diver will be used, but since the time required for temporary fixing is short, the cost will not be very high.

After the support 3 is temporarily fixed to the outer periphery of the support 1, the short outer tube 5 is placed thereon as shown in FIG.

As a result, the support body 3 acts as a stopper, and the external intubation tube 5 is positioned and held relative to the support column 1.

In FIG. 3, figure a shows the case where the external tube 5 is a straight body tube, and figure b shows the case where the outer tube 5 is a tube with upper and lower flanges.

As shown in the figure, in the present invention, the upper end of the outer tube 5 is left open, and cement mortar is allowed to overflow from the upper end of the outer tube 5.

This is because so-called expandable mortar mixed with an expansion material is used as the cement mortar for filling, so the desired fixing effect is sufficiently achieved, and the seal at the upper end can be omitted.

However, the situation is different regarding the seal at the lower end, so sealing measures will be taken.

That is, the packing layer 4 is formed at the bottom of the mounting tube 5 by adding rags, sand, gravel, etc.

Taking this layer height into consideration in advance, it is recommended that the external intubation tube 5 be made approximately 10 cm longer.

Thus, the lower end of the short outer tube 5 is sealed, and in this state, expandable cement mortar 10 is injected and filled into the gap between the column 1 and the short outer tube 5, and the short outer tube 5 is connected to the column 1. Fixed to.

``Effect of the invention'' In the above-mentioned case structure of the present invention, the positioning and holding of the external intubation tube 5 and the sealing measures are extremely simplified, so the construction is much simpler than the conventional one, and the construction work is much easier. Costs can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is an overall front view of an underwater structure in which case points are formed according to the present invention, FIG. 2 is a plan view of a support, and FIGS. 3 a and 3 b are longitudinal sectional views of the case point structure of the present invention. DESCRIPTION OF SYMBOLS 1... Strut, 2... Brace material, 3... Support body, 4... Filling layer, 5... Outer short tube, 6... Rib, 7... Half plate, 8... Hinge, 9 …
...Bolt, 10...Expansible cement mortar.

Claims (1)

[Scope of utility model registration request] Temporarily fix a half-split annular support at the appropriate location of the support that has been cast in the water, place the short outer pipe on top of it, and pour rags, sand, gravel, etc. into the gap created in the place where it is placed. A point structure in an underwater structure characterized in that the space between the column and the short outer tube is filled with cement mortar, and the short outer tube is fixed to the column.