JPH063023B2 - Construction method of deep water dike - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is for use in a large water depth where a levee body such as a revetment or a breakwater can be constructed in a place with a large water depth in a stable state against wave forces such as waves. It is related to the construction method of the bank body.

[Conventional technology]

Conventionally, in places where the water depth is not great, caisson and sheet pile are used to construct seawalls and breakwaters such as breakwaters.
When the water depth increases, when using a caisson, the caisson itself becomes enormous, and its construction is difficult and economically problematic.

When using sheet piles for deep water, the sheet piles directly receive the wave force such as waves while placing multiple rows of sheet piles and then inserting the filling sand between them. On the other hand, there was a problem that it became unstable and the construction was difficult.

[Problems to be Solved by the Invention]

The present invention has been made in order to solve the above-mentioned conventional problems, and of a deepwater dike body that can be constructed in a stable state against wave force during construction of a dike body at a deep water depth. The problem to be solved is to provide a construction method.

[Means for Solving the Problems]

As a means for solving the above problems, the method for constructing a deepwater dike body of the present invention is such that a plurality of steel pipe sheet piles of a predetermined length and short straight sheet piles of a predetermined length are alternately provided on the lid portion. A row-fixed caisson with a lid is manufactured in advance on land or in a floating dock, and the caisson with a lid is towed to a predetermined installation location by a tow boat, and the caisson is installed by pouring water from a steel pipe sheet pile into After injecting slurry-like filling sand consisting of sand from the steel pipe sheet pile into the caisson,
Insert the filling sand to a little lower than the upper end of the straight sheet pile between the plurality of rows of straight sheet piles, and then add and match the straight sheet piles that match the next filling height of the filling pile on the straight sheet pile. It is characterized in that the work of throwing in the filling sand is repeated up to a predetermined height, and during the construction of the dam body, waves pass through the upper part of the straight sheet pile where the filling sand is thrown, and the waves applied to the steel pipe sheet pile. The force will be reduced and stable construction will be performed.

〔Example〕

A procedure in one embodiment of constructing a deepwater levee body by applying the construction method of the present invention will be described below with reference to the drawings.

First, as shown in FIG. 1, a plurality of rows of lower end portions of a steel pipe sheet pile 2 having a predetermined length and a straight sheet pile 3 having a short length are alternately arranged on a lid portion of a caisson 1 with a lid, for example, in this embodiment. Like 2
The caisson with lid 1 fixed by embedding in rows is manufactured in advance on land or in a floating dock. These straight sheet piles 3 are made of steel or concrete, and if necessary, steel pipe sheet pile 2 Comrades and steel pipes Sheet pile 2 and caisson with lid 1
A reinforcing member 4 is rigidly connected to the upper surface of the.

Next, since air is contained in the caisson 1 with the lid, buoyancy is imparted, and the caisson 1 can be towed to a predetermined installation place.

Therefore, after positioning the caisson with lid 1 on the rubble mound 5 laid at a predetermined installation location as shown in FIG. 2, water is injected from the upper end of the steel pipe sheet pile 2 by the pump 6 into the caisson with lid 1 through the pipe, The attached caisson 1 is installed, and as shown in FIG. 3, the slurry-like filling sand 7 composed of water W and sand is
The slurry pump 8 injects from the upper end of the steel pipe sheet pile 2 into the inside of the capped caisson 1 through the inside of the pipe. At this time, the water W in the capped caisson 1 is pumped by the pump 6 into the slurry-like filling sand 7. Used as water mixed in.

Next, as shown in the side sectional view of FIG. 4-A, the front view of FIG. 4-B and the plan view of FIG. 4-C, slightly below the upper end of the straight sheet pile 3 between the two rows of straight sheet piles 3. After throwing in the filling sand 9 up to, as shown in FIG. 5, according to the feeding height of the next filling sand 9, the additional straight sheet pile 3A is inserted by butting.
At the first butting portion of the straight sheet pile 3A to the upper end of the straight sheet pile 3, packing is provided so that the filling sand 9 does not flow out.

Then, the filling sand 9 is thrown in to slightly below the upper end of the straight sheet pile 3A as shown in FIG. 6-A and its front view, FIG. 6-B.

Next, as shown in FIG. 7, an additional straight sheet pile 3B is added and abutted, and then the work of inserting the filling sand 9 of FIGS. 8-A and 8-B up to a predetermined height. Repeat,
As shown in Fig. 9-A and Fig. 9-B, the upper concrete 10 is finally constructed to complete the revetment.

Here, between the caisson with lid 1 and the caisson with lid 1 of each block, packed concrete 11 is placed to fill the landfill 1
2 does not flow out during this period.

Next, another embodiment in which the construction method of the present invention is applied to a breakwater is shown in FIGS. 10-A and 10-B,
In this case, in order to arrange the wave-dissipating block 13 on the traveling direction side of the wave indicated by the arrow F, three rows of the steel pipe sheet piles 2 and the straight-line sheet piles 3 are alternately provided, and the port where the wave-dissipating block 13 is arranged. Outside is the straight line sheet pile 3 only to the lower end of the wave-dissipating block 13.
And the filling sand 9 is not provided.

If you want to increase durability and strength, steel pipe sheet pile 2
The rebar cage can be inserted into the inner space of the container and filled with concrete, and the straight sheet pile 3 can have a hybrid structure of steel and concrete.

〔The invention's effect〕

According to the method for constructing a deep-water levee body of the present invention described above, at the time of towing and installation of the caisson, there is no straight sheet pile in the upper portion that receives the wave force, so the wave is a straight sheet pile between the steel pipe sheet piles. There is an effect that it can pass through the upper part of the ship, is less affected by wave force, and can be stably towed and installed.

Moreover, since the straight line sheet piles are sequentially butted and added according to the construction speed of the filling sand, the construction in a stable state can be performed.

Furthermore, since the steel pipe sheet pile is used in the present invention, the buoyancy of the steel pipe sheet pile can be utilized when the caisson is towed,
There is also an advantage that the steel pipe sheet pile can be used as a conduit for water injection into the caisson and injection of slurry-like filling sand.

[Brief description of drawings]

FIGS. 1 to 9-B are a series of explanatory views of a procedure in one embodiment in which the construction method of the present invention is applied to construct a revetment as a levee body for deep water, and FIG. 1 is a towed caisson. Fig. 2 is a side view of the caisson at the time of water injection installation, Fig. 3 is a side view of the caisson at the time of pouring the sand in the sand, and Fig. 4
-Figure A is a side cross-sectional view at the time of filling with the filling sand, and Figure 4-B is the side cross-sectional view.
-A front view of Fig. A, Fig. 4-C is a plan view of Fig. 4-A, Fig. 5 is a side sectional view at the time of butting of additional straight sheet piles, Fig. 6-
FIG. A is a side sectional view of the next filling of the filling sand, FIG. 6-B is a front view of FIG. 6-A, and FIG. 7 is a side sectional view of the final additional straight sheet pile butted. Fig. 8-A is a side sectional view when the final filling sand is added, Fig. 8-B is a front view of Fig. 8-A, and Fig. 9-A.
The figure is a side sectional view after completion of the seawall, Fig. 9-B is a plane sectional view in the direction AA of Fig. 9-A, and Fig. 10-A is another embodiment in which a breakwater is constructed by the method of the present invention. Sectional side view,
FIG. 10B is a horizontal sectional view taken along the line BB of FIG. 10-A. 1 ... Caisson with lid, 2 ... Steel pipe sheet pile, 3, 3A, 3B ... Straight sheet pile, 7 ... Slurry-shaped filling sand, 9 ... Filling sand.

Claims (1)

[Claims] 1. A caisson with a lid, in which lower ends of a steel pipe sheet pile having a predetermined length and a straight sheet pile having a short length are alternately fixed to a plurality of rows on a lid portion, is towed to a predetermined installation location and the inside of the caisson is cut from the steel pipe sheet pile. Installed by pouring water into the caisson from the steel pipe sheet pile into the caisson, then insert the filling sand slightly below the upper end of the straight sheet pile between the multiple rows of straight sheet piles, and then the straight sheet pile. A method for constructing a deep-water levee body in which a straight sheet pile corresponding to the next filling height of the filling sand is butt-mounted and the filling sand is repeatedly fed to a predetermined height.