JPH0434646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a technique for constructing a covered drain pile in underwater ground, that is, a drain pile made of sand or a similar material covered with a water-permeable covering. It is something.

(Problem to be solved by the invention and its features) When constructing covered drain piles in underwater ground,
A hollow tube that is longer than the sum of the pile length and water depth is used, and the cover is suspended from above inside this hollow tube, and drainage material such as sand is poured into the lower part of the hollow tube (pile length It is customary to form a covered drain pile in the corresponding part of the waterbed, and to leave this covered drain pile in the ground when the hollow pipe is pulled up after penetrating the waterbed to a specified depth. , the formation of the covered drain pile in this case is intermittent.

The present invention aims to improve work efficiency by continuously inserting covered drain pile bodies into a hollow pipe and performing construction work with the covered drain pile bodies always existing within the hollow pipe over its entire length. The structural features thereof are as described in the claims.

In addition, in order to insert the covered drain pile body in the present invention, a bag-shaped cover body filled with drain material such as sand in advance is inserted from above the hollow pipe, or a prepared pile body is inserted into the pile body from above the hollow pipe. The covering body is filled with drain material above the hollow tube while being put into the hollow pipe, or the covering body is formed from a sheet-like covering material above the hollow tube and drain material is filled. You can either insert it into the hollow tube while doing so.

(Explanation with drawings) In FIG. 1 showing an embodiment of the present invention, 1 is a hollow pipe that is longer than the sum of the water depth H at the construction site and the length L of the covered drain pile to be constructed. , penetrate the underwater ground G to a predetermined depth in the order of a to d, and during this time, the hollow pipe 1 is inserted from above.
The covered drain pile body 2 in a continuous state is inserted into the container.

From the state of d, in the order of e and f, the hollow pipe 1 is left with the lower part of the covered drain pile body 2 remaining in the underwater ground G.
When the lower end of the hollow pipe 1 reaches a position slightly above the surface of the underwater ground G, the lifting of the hollow pipe is stopped, and the covered drain pile is installed near the lower end of the hollow pipe 1 by appropriate means. The body 2 is cut to create a covered drain pile 3 of a predetermined length as indicated by h in the underwater ground G.

During this time, as the hollow tube 1 rises and the lower part of the covered drain pile body 2 comes out from the lower end of the hollow tube 1, a new covered drain pile body 2 is inserted into the hollow tube 1 from above. A covered drain pile body 2 is always present within the hollow tube 1 over its entire length.

Therefore, move this hollow tube 1 to another creation point to bring it to state i, and then perform the creation work at that point in the order of j (same as b), c to h, and repeat this at multiple locations. .

Next, FIG. 2 shows an embodiment in which a hollow tube 1' consisting of an inner and outer double tube that expands and contracts in a telescopic manner is used, and a' to j' are a to a in FIG.
Each corresponds to j.

The inner pipe 4 is fixed to a work boat (not shown) and is immovable, and the outer pipe 5 reciprocates between the raised position where it overlaps the inner pipe 4 shown at a' and b' to the final penetration position shown at d'. It's summery.

The covered drain pile body 2' of this embodiment is constructed by connecting units of improved length with closed lower ends with strings, etc., and the cutting of the covered drain pile body 2' at g' is done at this connecting part. I'm getting older, but
Of course, the same covered drain pile body 2 as shown in FIG. 1 may be used.

In addition, in the embodiment shown in FIG. 2, the upper end of the inner pipe 4, that is, the upper end of the hollow pipe 1' is always in a fixed position, so it is easier to insert the covered drain pile than in the case shown in FIG. .

The above is an overview of the embodiments of the present invention, and next, supplementary explanations will be given for each detail.

When making a covered drain pile in advance, it is convenient to handle it by tying both ends of the specified pile length L with string, as shown in Figure 3. You may tie something in the middle, or you may connect units with both ends tied.

When constructing a covered drain pile by filling a pre-prepared covering with drain material above the hollow pipe, install the covering in a contracted state above the hollow pipe and fill the drain material from the hopper. When this covering is fully extended, the next covering may be similarly shortened and installed connected to the previous covering, or alternatively, as shown in Figure 4, a pile may be installed. A covering with cuts 6 made at intervals of the pile length L (in the case of A) or arbitrarily equally spaced intervals of the pile length L (in the case of B) is wound around a drum, and as the covering is paid out, drain at the cuts 6. It may be filled with material.

When constructing a covered drain pile above a hollow pipe by forming a covering body from a sheet-like covering material and filling it with drain material, glue or engage both edges of the covering material by appropriate means. While shaping it into a cylinder, fill it with drain material.

Cutting of the covered drain pile can be carried out, for example, by providing an appropriate cutter means at the lower end of the hollow pipe, but it is also possible to cut the covered drain pile body by lowering it to the water bottom ground level at the bottom of the leader that guides the raising and lowering of the hollow pipe. A guide may be provided and the cutter means may be provided on this guide.

The embodiment shown in FIG. 2 can be implemented using, for example, an apparatus as shown in FIG.

In FIG. 5, reference numerals 7 and 7 are frames fixed at fixed positions on a work boat (not shown);
The upper ends of the inner tubes 4, 4 are attached to 7. The upper ends of the outer tubes 5, 5 are connected by a connecting member 8, and a rod 10 extending downward from a penetrating machine 9 is connected to the connecting member 8.
The tip is fixed.

The penetrating machine 9 is suspended via a wire 11, and the outer tubes 5, 5 are penetrated into the underwater ground G by loosening the wire 11 while operating the penetrating machine 9, and wind up the wire 11. It is pulled out by this.

The covering bodies 12, 12 are wound around a drum (not shown) in a flat state, and are sequentially fed out into the inner tubes 4, 4, so that the upper end opening of the unit body is located at the position of the hoppers 13, 13 installed in the frames 7, 7. Drain material will be filled when it arrives.

(Effects of the Invention) The present invention is as described above, and a continuous coated drain pile body is inserted from above into a hollow pipe that is longer than the sum of the pile length and water depth, and the pipe is always hollow. Since work is carried out with the covered drain pile always existing within the pipe over its entire length, when the covered drain pile is cut near the lower end of the hollow pipe after construction at a certain point, the inside of the hollow pipe is Water will not flow back into the hollow pipe because it is blocked by the covered drain pile, and the hollow pipe can be immediately moved to the next location and the next construction work can be started. It is only necessary to form it into a continuous state and introduce it into a hollow tube, and in these respects, it is expected that work efficiency will be improved.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of one embodiment of the present invention, Fig. 2 is a schematic explanatory diagram of another embodiment, Fig. 3 is an example of a covered drain pile body, and Fig. 4 is a cut in the covering body. FIG. 5 is an illustration of an example of an apparatus used in carrying out the present invention. In the figure, 1, 1...hollow pipe, 2, 2'...coated drain pile body,...

Claims (1)

[Claims] 1. Insert a continuous coated drain pile from above into a hollow pipe that is longer than the sum of the pile length and water depth, while ensuring that the covered drain pile always exists within the hollow pipe throughout its entire length. , an operation in which the hollow pipe is penetrated to a predetermined depth in the underwater ground at a certain point, an operation in which the hollow pipe is pulled up while leaving the lower part of the covered drain pile in the ground, and an operation in which the lower end of the hollow pipe is lower than the surface of the underwater ground. An underwater ground covered drain characterized in that the operation of cutting the covered drain pile body near the lower end of the hollow pipe when it reaches a somewhat upper position and the operation of moving the hollow pipe to the next point are sequentially performed. Pile construction method.