JP2756838B2 - Underwater construction method for steel sheet piles and Jatco for steel sheet piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a case where a foundation such as a pier is laid underwater when a structure such as a pier is constructed at a relatively deep place in a sea, a lake, a river, or the like. In addition, when performing flood control works in rivers, etc., the work of embedding steel pipe sheet piles, straight steel sheet piles, etc. (hereinafter referred to as steel sheet piles at the ends) in the bottom of the water can be performed from the water, and the steel sheet piles can be connected to each other. The present invention relates to an underwater construction method of a steel sheet pile which can be accurately driven into engagement with a predetermined depth of a joint, and a yatoko for a steel sheet pile suitable for carrying out this method.

[Conventional technology]

When constructing foundations for underwater structures such as piers to construct structures such as piers in relatively deep water areas such as seas, lakes, rivers, etc. An installation operation is performed in which the joints are engaged and driven sequentially.

For example, when laying the foundation for the structure, a steel pipe sheet pile is erected around the part where the foundation for the structure is laid to form a well foundation. The steel sheet piles such as linear and U-shaped are continuously erected. Conventionally, the following method has been used to lay a steel sheet pile in a relatively deep place such that its upper end is located in the water.

Even if the lower end of the steel sheet pile is driven into the underwater ground to a predetermined depth, a steel sheet pile having a length equal to or more than the required length such that the upper end is still located on the water surface is prepared, and the steel sheet pile is driven into the underwater ground, A method in which a joint of the next steel sheet pile is engaged with the joint of the driven steel sheet pile and driven sequentially, and then the steel sheet pile is melted at a required length in water by a diver.

A steel sheet pile having a required length and a jack having a hydraulically operated chuck at the lower end capable of gripping the upper end of the steel sheet pile are prepared.The upper end of the steel sheet pile is gripped by the lower end chuck of the steel sheet pile, and the steel sheet pile is gripped through the ratchet. Hammering the steel sheet pile into the underwater ground. The submersible diver confirms in the water that the joint of the next steel sheet pile is engaged with the joint of the preceding steel sheet pile that was previously driven, and then sequentially works to drive the steel sheet pile into the underwater ground through a yatoco. How to do.

However, the above-mentioned method is not only dangerous in any case because it requires the work of handling a steel sheet pile by a diver underwater, and has the drawback that the working efficiency is very low, and the former method has a required length. After driving the steel sheet pile having the above-mentioned length, an unnecessary long steel sheet pile must be prepared in order to melt unnecessary parts, so that there is also a disadvantage that the material cost is high and the method is not economical.

[Problems to be solved by the invention]

The present invention solves the above-mentioned drawbacks of the prior art, and works by driving a steel sheet pile having a required length to a precise depth and accurately engaging joints of adjacent steel sheet piles by working from the water surface. An object of the present invention is to provide an underwater construction method of a steel sheet pile that can be performed and a yatoko for a steel sheet pile suitable for performing the method.

[Means for solving the problem]

The present inventors have conducted various studies in order to solve such problems, and as a result, the latter method is superior to the former method in that it does not require an unnecessarily long steel sheet pile, so the latter method is used. In order to eliminate the disadvantages of this latter method, the vertical joint of the steel sheet pile to be driven next to the vertical joint of the preceding steel sheet pile previously driven into the underwater ground should be used from above the water surface. Therefore, the steel sheet pile should be able to be securely engaged and be able to be erected at a precise depth in the water. For that purpose, a steel sheet pile jaw gripping the upper end of the steel sheet pile with the lower end chuck is opposed to the steel sheet pile. A vertical guide with the same shape and cross section as the vertical joints on both sides of the steel sheet pile is provided at the side of the steel sheet pile, and the upper end is exposed above the water surface when the steel sheet pile is driven into the underground. Length and the leading steel arrow The guide of the steel sheet pile jaw and the joint of the preceding steel sheet pile that are gripped by the chuck at the lower end thereof are aligned with each other, and the steel sheet pile to be driven next is guided by the lower end. The guide is also aligned with the joint of the steel sheet pile in a straight line, and is exposed on the water surface of a steel sheet pile jackcourt in a state where the preceding steel sheet pile previously driven is still gripped by the lower end chuck. If the joint of the steel sheet pile is driven into the guiding guide, the joint of the steel sheet pile can be driven into the undersea ground with the engagement of the joint of the preceding steel sheet pile accurately. No work by a diver in the water is necessary, and no material is wasted.The driving depth of the steel sheet pile is set at the upper end of the steel sheet pile jaw that holds the steel sheet pile to be driven with the lower end chuck. Because it accurately determined from the water surface and completed the present invention by investigating that can be implanted safely and reliably the steel sheet pile.

Hereinafter, an underwater construction method for steel sheet piles according to the present invention and a yatco for steel sheet piles according to the present invention suitable for carrying out the present invention will be described in detail.

FIG. 1 is an explanatory view showing a state in which a steel sheet pile underwater erection method according to the present invention is carried out, and FIG. 2 is a view A in FIG.
FIG. 3 is an enlarged cross-sectional view taken along the line A, FIG. 3 is a transverse cross-sectional view showing another example of the stepped shape of the vertical joint of the steel sheet pile, and FIG. 4 is an embodiment of the steel sheet pile jawko according to the present invention. B in FIG.
FIG. 5 is a plan view of the same.

In order to carry out the method of the present invention, first, vertical joints formed on both sides of the steel sheet pile 1 driven into the underwater ground 5 are used.
The guide sheet 2a has the same shape as the vertical light hand 1a whose position coincides with that of 1a and whose cross section is formed on the steel sheet pile 1. At this time, there are prepared at least two steel sheet pile jacks 2 having a length whose upper end is exposed above the water surface and a lower end having a chuck 2b operated by hydraulic pressure or the like for gripping the upper end of the steel sheet pile 1. That is, at least two steel sheet pile jaws 2 are prepared, the steel sheet pile jaws 2 gripping the steel sheet pile 1 to be driven next and the steel sheet pile jaws 2 gripping the preceding steel sheet pile 1. Then, first, the upper end of the preceding steel sheet pile 1 is gripped by the chuck 2b at the lower end of the one steel sheet pile jack 2 and is driven into the underwater ground 5, and at this time, the vertical joint 1a of the preceding steel sheet pile 1 and this leading It is necessary that the steel sheet pile 1 is held by the chuck 2b at the lower end so that the vertical guides 2a formed on the opposite side surfaces of the steel sheet pile jack 2 are aligned with each other in a straight line. Next, on the water surface, the steel sheet pile 1
Guide formed on the side opposite to the joint 1a
The steel sheet pile 1 is gripped by the chuck 2b at the lower end of the other steel sheet pile jack 2 so that the steel sheet pile 2a and the steel sheet pile 1 are aligned in a straight line.
The upper end of the preceding steel sheet pile 1 into which the joint 1a of the steel sheet pile 1 has already been driven is engaged with the guide 2a of the steel sheet pile jaw 2 which is gripped by the chuck 2b, and the lower end of the steel sheet pile 1 is set. A striking force is applied to the steel sheet pile jaw 2 gripped by the chuck 2b by a driving means 3 such as a vibration hammer or a diesel hammer to apply the impact force to the steel sheet pile 1.
Is driven into the underwater ground 5 to a predetermined depth. This operation is repeated as many times as the number of the steel sheet pile jaws 2 to be used. Thereafter, the grip 2b of the steel sheet pile jaws 2 gripping the upper end of the preceding steel sheet pile 1 is released to release the steel sheet piles. Jatco 2 for steel sheet piles holding the upper end of steel sheet pile 1 which is pulled up onto water surface and newly driven in
And the above operation is repeated.

In such work, the suspension of the steel sheet pile jaw 2 provided with a driving means 3 such as a vibration hammer or a diesel hammer at the upper end is a place remote from the land such as the sea and difficult to work from the land. In this case, the work boat 4 for pile driving may be used, and when it is close to the land, a crane truck (not shown) installed on land may be used.

(Operation)

When the construction method of the present invention is carried out, the ratchet 2 for steel sheet pile according to the present invention is provided with a chuck 2b at the lower end for gripping the upper end of the steel sheet pile 1, and the upper end is gripped by the chuck 2b and is driven into the underwater ground 5. A vertical guide 1a, which is aligned with the vertical joints 1a formed on both sides of the steel sheet pile 1 to be formed and has a cross section of the same shape as that of the steel sheet pile 1, is provided at the position of the opposite side face. Since it has a length such that the upper end thereof is exposed above the water surface when it is driven into the underwater ground 5, the steel sheet pile 1 is guided by the guide 2a of the steel sheet pile jaw 2 which is gripped by the lower end chuck 2b. Since the joint 1a of the steel sheet pile 1 to be driven can be engaged on the water surface, the engagement can be reliably performed. The joint 1a of the steel sheet pile 1 is initially connected to the preceding steel sheet pile 1 by the lower end chuck.
2b is engaged with the guide 2a of the steel sheet pile jaw 2 which is gripped by 2b, and then driven into engagement with the vertical joint 1a of the preceding steel sheet pile 1, so that it is engaged with the vertical joint 1a of the preceding steel sheet pile 1. It will not be driven in the wrong state. Also, in the process of driving the steel sheet pile 1 into place, the guide 2a of the steel sheet pile jack 2 holding the steel sheet pile 1 with the lower end chuck 2b holds the preceding steel sheet pile 1 with the lower end chuck 2b. The above-mentioned effect is more reliably achieved because the engagement with the guide 2a of the steel sheet pile jaw saw 2 is achieved.

〔The invention's effect〕

As described in detail above, the steel sheet pile embedding method according to the present invention engages a joint between adjacent steel sheet piles by using a special ratchet for a steel sheet pile driven into a state where the upper end is immersed in water. It can be built reliably in the state where it was made. That is, since the upper end of the steel sheet pile jaw is exposed above the water surface, it is necessary to check from above the water surface how the guide of the steel sheet pile jaw is engaged with the joint of the steel sheet pile to be driven next. The engagement of the joint between the steel sheet pile and the joint of the steel sheet pile is guaranteed by confirming the engagement between the guide of the steel sheet pile and the joint of the steel sheet pile. Further, since the operation of driving the steel sheet pile into the underwater ground is performed from above the water surface by the driving means, the position of the driving means or the upper end of the steel sheet pile jaw holding the steel sheet pile with the lower end chuck is positioned above the water surface. Since the depth of the steel sheet pile can be accurately determined by confirming from the above, the steel sheet pile is guided to a position adjacent to the preceding steel sheet pile and driven into the underwater ground to perform a series of work underwater by a diver. It is unnecessary and excellent in safety, and it is economical because it only has to use a steel sheet pile of the required length. The industrial value of the present invention having such various advantages is very large.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which an underwater construction method of steel sheet pile according to the present invention is carried out, and FIG.
FIG. 3 is an enlarged cross-sectional view taken along the line A, FIG. 3 is a cross-sectional view showing another example of the cross-sectional shape of the vertical joint of the steel sheet pile, and FIG. 4 is a cross-sectional view showing one embodiment of the steel sheet pile jawco according to the present invention. FIG. 1 is an enlarged explanatory view of a portion B in FIG. 1 and FIG. 5 is a plan view of the same. In the drawings: 1 ... steel sheet piles 1a ... vertical joints 2 ... steel sheet pile jacks 2a ... vertical guides 2b ... chucks 3 ... driving means 4 ... work boat 5 ... submarine ground

Continuing on the front page (72) Inventor Nobuyuki Nagano 2-23-18 Shimomeguro, Meguro-ku, Tokyo Wakatsuki Construction Co., Ltd. (72) Inventor Kaoru Oyama 2-23-18 Shimomeguro, Meguro-ku, Tokyo Wakatsuki Inside Construction Co., Ltd. (72) Inventor Kunio Funada 2-23-18 Shimomeguro, Meguro-ku, Tokyo Wakatsuki Construction Co., Ltd. (56) References JP-A-2-2363111 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) E02D 7/02 E02D 13/00

Claims (2)

(57) [Claims] 1. A vertical guide (2a) having the same shape as a vertical joint (1a) formed on both sides of a steel sheet pile (1a) and having the same cross section at opposite sides. At least two jaws (2) for steel sheet piles having a chuck (2b) at the lower end for gripping the upper end of the steel sheet pile (1) are prepared.
First, the preceding steel sheet pile (1) is gripped with the chuck (2b) at the lower end of one steel sheet pile dolly (2) so that the joint (1a) and the guide (2a) are aligned in a straight line. A striking force is applied to the steel sheet pile jaw (2) by the driving means (3) to drive the steel sheet pile (2) into the underwater ground (5), and then to the next on the water surface, the joint (1a) of the steel sheet pile (1) and the guide. With the chuck (2b) at the lower end of the next steel sheet pile (2), the steel sheet pile (1) is aligned so that (2a) is aligned with the straight line.
And a guide (2) for a steel sheet pile jaw (2) gripping the upper end of the preceding steel sheet pile (1) into which the joint (1a) of the steel sheet pile (1) has already been driven by the chuck (2b). Two
After engaging with (a) to bring the steel sheet pile (1) into a state of being in a straight line, a striking force is applied by a driving means (3) to the steel sheet pile jaw (2) holding the lower end of the steel sheet pile (1). The steel sheet pile (1) is driven into the underwater ground (5) to a predetermined depth,
This operation is repeated as many times as the number of the steel sheet pile jaws (2) to be used. Thereafter, the end of the chuck (2b) of the steel sheet pile jaw (2) holding the upper end of the preceding steel sheet pile (1) is opened. The above work is repeated by pulling up the steel sheet pile jaw (2) above the water surface and using it as a steel sheet pile jaw (2) for holding the upper grip of a steel sheet pile (1) to be newly driven. Underwater construction method. A chuck (2b) is provided at the lower end for gripping the upper end of the steel sheet pile (1), and the upper end of the steel sheet pile (1b) is gripped by the chuck (2b) and is driven into the underwater ground (5). ), A vertical guide (2a) having the same shape as that of the vertical joint (1a) formed on both sides of the steel sheet pile (1) is provided at the position of the opposite side surface. ) Having a length such that the upper end thereof is exposed above the water surface when the rubber sheet is driven into the underwater ground (5).