JPS5833143Y2 - steel pipe sheet piles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steel pipe sheet pile, and particularly to a steel pipe sheet pile having a pair of pipe-shaped joints.

Conventionally, steel pipe sheet piles are often used, in which a pair of pipe-shaped joints are fixed to the outer peripheral surface of the main sheet pile along the pipe axis direction, and a slit is provided in the pipe-like joints along the entire length along the pipe axis direction. .

However, in such conventional steel pipe sheet piles, the widths of the slits provided in each of the pair of pipe-shaped joints were equal to each other.

Therefore, as shown in Figure 1A, the steel pipe sheet pile 1 that has already been placed
One of the pipe-shaped joints 3 of the pair of pipe-shaped joints fixed to the outer peripheral surface of the sheet pile main pipe 2a of a, and one of the pipe-shaped joints of the pair of pipe-shaped joints fixed to the outer peripheral surface of the sheet pile main pipe 2b of the steel pipe sheet pile 1b. Even if the steel pipe sheet pile 1b is started to be driven with the other pipe-shaped joint 4 properly engaged, if the steel pipe sheet pile 1b rotates in the direction of arrow A during the driving, the situation shown in FIG. One end face 6 of the circumferential end faces 6, 7 of the pipe-like joint 4 forming the slit 5 collides with the inner circumferential face of the pipe-like joint 3, and a warp occurs, and the slit 8
One end face 9 of the circumferential end faces 9, 10 of the pipe-like joint 3 that forms the pipe-like joint 3 collides with the inner circumferential surface of the pipe-like joint 4, and a warp occurs.

Further, if the steel pipe sheet pile 1b rotates in the direction of arrow B, the other end surface 7 in the circumferential direction of the pipe-shaped joint 4 as shown in FIG. 1C.
The outer peripheral surface of the pipe-shaped joint 3 collides with the outer circumferential surface of the pipe-shaped joint 3 to generate a warp, and the other end surface 10 of the pipe-shaped joint 3 in the circumferential direction collides with the outer peripheral surface of the pipe-shaped joint 4 to generate a warp.

As described above, in conventional steel pipe sheet piles, shear occurs at two locations due to the rotation of the steel pipe sheet piles during driving, which increases driving resistance and reduces driving efficiency.

Also, in extreme cases, pouring becomes impossible.

In view of the above points, the present invention aims to provide a steel pipe sheet pile that can reduce the increase in driving resistance due to warping that occurs when the steel pipe sheet pile rotates during driving. will be explained based on the drawings.

In FIG. 2, reference numeral 11 indicates a main sheet pile made of steel pipes, and a pair of pipe-shaped joints 12 and 13 made of steel pipes are provided on the outer peripheral surface of the main pipe 11 at positions approximately one circumference apart from each other in the axial direction of the pipe. These sheet pile main pipes 11 and pipe-shaped joints 12 and 13 constitute a steel pipe sheet pile 14.

The pair of pipe-shaped joints 12.13 have the same diameter and have a slit 15.1 extending along the entire length along the pipe axis direction.
6 are formed respectively.

Further, as shown in FIG. 3, the one pipe-shaped joint 12
The width S1 of the slit 15 formed in the other pipe-shaped joint 13 is narrower than the width S2 of the slit 16 formed in the other pipe-shaped joint 13, and the straight line 11 passing through the axes of both pipe-shaped joints 12 and 13 and the one Axis center of pipe-shaped joint 12 and slit 15
The angle α4 between the straight line 11 and the straight line 12 passing through the circumferential center of equal.

This angle .alpha. 12 and the sheet pile main pipe 11, the length in the circumferential direction of the pipe-shaped joint 12 reaches the contact part 19 between the pipe-shaped joint 12 and the sheet pile main pipe 11.
8 to the contact portion 19, and which forms the slit 16 of the other pipe-like joint 13. From one end face 20 of the circumferential end faces 20, 21 (FIG. 2) to the pipe-like joint 13. The length in the circumferential direction of the pipe-shaped joint 13 reaching the contact portion 22 between the pipe 13 and the sheet pile main pipe 11 is longer than the length from the other end surface 21 to the contact portion 22.

Now, as shown in FIG. 4A, the sheet pile main pipe 11a of the steel pipe sheet pile 14a having the above-mentioned configuration that has already been cast is fixed to the outer peripheral surface.
a pipe-shaped joint 13a having a wide sleeve H6a;
A pipe-shaped joint 12b having a narrow slit 15b fixed to the outer circumferential surface of the sheet pile main pipe 11b of another steel pipe sheet pile 14b having the above-mentioned configuration is connected to both pipe-shaped joints 13a.
, 12b are mutually ribs H5b.

When the steel pipe sheet pile 14b is engaged so as to pass through the circumferential center of the steel pipe sheet piles 16a and the driving of the steel pipe sheet pile 14b is started, the steel pipe sheet pile 14b
is rotated in the direction of arrow C, one end surface 17b of the pipe-shaped joint 12b and the pipe-shaped joint 1 are rotated as shown in FIG. 4B.
3a collides with the inner circumferential surface of the pipe-shaped joint 12b to generate a warp, but at this time, one end surface 20a of the pipe-shaped joint 13a and the inner circumferential surface of the pipe-shaped joint 12b are not in contact with each other.

Moreover, when the steel pipe sheet pile 14b rotates in the direction of the arrow,
As shown in FIG. 4C, the other end surface 18b of the pipe-like joint 12b collides with the outer peripheral surface of the pipe-like joint 13a, causing a warp, but at this time, the other end surface 21a of the pipe-like joint 13a and the outer peripheral surface of the pipe-shaped joint 12b are not in contact with each other.

In this way, the shear that occurs due to the rotation of the steel pipe sheet pile 14 during the driving of the steel pipe sheet pile 14 always occurs in only one place, so compared to the conventional case where the shear occurs in two places, it is possible to Increase in driving resistance can be significantly reduced.

By the way, as shown in FIG. 4B, one end surface 17b of the pipe-like joint 12b collides with the inner peripheral surface of the pipe-like joint 13a, causing a warp, and as shown in FIG. The other end surface 18b of 12b and the pipe-shaped joint 13a
Regarding the case of collision with the outer circumferential surface of the
Comparing the increase in driving resistance, from one end surface 17b of the pipe-like joint 12b to the pipe-like joint 12b and the sheet pile main pipe 11.
The length of the pipe-shaped joint 12b in the circumferential direction from the other end surface 18b to the contact portion 19b with the contact portion 19b is
4B, the pipe-shaped joint 12b in FIG. 4B is easier to deform, and the increase in driving resistance is smaller.

On the other hand, a spiral steel pipe is usually used as the main sheet pile 11; in such a steel pipe sheet pile 14, the direction of rotation during driving is determined by the direction of the spiral weld bead formed on the outer peripheral surface of the main sheet pile 11.

Therefore, in the steel pipe sheet pile 14 using spiral steel pipes as the main sheet pile 11, the steel pipe sheet pile 14 as shown in FIG.
The pipe-shaped joint 12 is attached to the outer surface of the sheet pile main pipe 11 so that one end surface 17b of the pipe-shaped joint 12b collides with the inner circumferential surface of the pipe-shaped joint 13a due to rotation during the pouring of the pipe-shaped joint 13b.
．． It is preferable to decide how to attach 13.

As explained above, according to the steel pipe sheet pile according to the present invention, slits of different widths are provided in each of the pair of pipe-shaped joints, so that the problem occurs when the steel pipe sheet pile rotates during pouring. The increase in driving resistance due to the edge can be significantly reduced.

[Brief explanation of the drawing]

Figures 1A to 1C show conventional joint meshing parts of steel pipe sheet piles. Figure A is a plan view of the normal meshing state, Figures B and C are plan views of one of the steel pipe sheet piles rotated, and the second 4 to 4 show an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a schematic plan view for explaining the width and position of the slit, and FIGS. Figure A is a plan view of a normal meshed state, and Figures B and C are plan views of one of the steel pipe sheet piles rotated. 11.11 a, 11 b---Sheet pile main, 12
, 12 b, 13, 13 a...pipe joint, 14, 14 a, 14 b... steel pipe sheet pile, 15.15 b, 16, 16 a---- slit.

Claims (1)

[Scope of utility model registration request] A pair of pipe-like joints are provided on the outer circumferential surface of the main sheet pile pipe along the pipe axis direction, and each of the pair of pipe-like joints is provided with slits having different widths over the entire length in the pipe axis direction. Steel pipe sheet piles.