JPS5842328B2 - steel pipe sheet piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel pipe sheet pile that prevents earth and sand from entering into a joint during construction.

When driving steel pipe sheet piles, especially in steel pipe sheet piles having pipe-shaped joints, earth and sand enter the joints, and the construction speed decreases due to friction between the inner surface of the joint and the earth and sand.

In addition, when filling the interlocking part of the joint with water-stop material such as mortar to create a watertight structure after completion of pouring, it is necessary to discharge the earth and sand inside the joint with a water jet, etc., but the length of driving into the ground is If it is long or has hard strata, it is difficult to drain the soil.

Therefore, it has been proposed to prevent dirt from entering by installing a blind plate at the tip of the joint, but the blind plate is installed on both joints that engage with each other. In order to prevent them from interfering with each other, they are formed according to the shape of the end face of the joint, so manufacturing is complicated.

The present invention can prevent earth and sand from entering into the joint, and
The purpose of this invention is to provide a steel pipe sheet pile that is easy to manufacture and can prevent interference between the tips of mutually meshing joints, and one embodiment thereof will be described below with reference to the drawings.

A is a steel pipe sheet pile according to the present invention, and a pair of pipe-shaped joints 2 are located on both sides in the diametrical direction of a main sheet pile 1 made of steel pipes.
, 3 are provided along the axial direction.

The joints 2 and 3 have meshing slits 4 over the entire length in the axial direction.
5, and the end positions of the joints 2 and 3 on the sheet pile main pipe one end 1a side are different from each other in the axial direction of the sheet pile main pipe 1, and the end positions of the joint 2 on the sheet pile main pipe one end 1a side are different from each other in the axial direction of the sheet pile main pipe 1. Sheet pile main end 1
The distance from joint a is shorter than that of joint 3 by length t.

A closing member 6 made of a half-oval plate is provided at the end of the joint 2 on the one end 1a side of the sheet pile main pipe.

The closing member 6 may be provided diagonally with respect to the side surface of the main sheet pile pipe 1 as shown in FIG. You may.

The shape can be rectangular, semicircular, circular, etc. as shown in Figure 8.
It may be trapezoidal or the like, and other shapes may also be used.

As shown in FIG. 3, the closing member 6 covers substantially the entire surface of the end face of the joint 2 on the sheet pile main end 1a side and protrudes further in the radial direction of the sheet pile main pipe 10 than the joint 2. In a state where the steel pipe sheet pile A and the joint 3 of the adjacent steel pipe sheet pile A are engaged, one end 1 of the sheet pile main pipe of the engaged joint 3
Substantially the entire surface of the end face on the a side is covered by the closing member 6 at the extended position.

Note that the protrusion length of the closing member 6 is preferably such that a distance α slightly larger than the wall thickness of the joint 3 is formed between the outer surface of the sheet pile main pipe 1 of the adjacent steel pipe sheet pile A.

Next, the work of constructing a sheet pile wall will be explained with reference to FIGS. 4 and 5.

First, a steel pipe sheet pile B having joints 2 on both sides of the sheet pile main pipe 1 in the diametrical direction, the end face of which is closed by a closing member 6 on the side of one end 1a of the sheet pile main pipe, is driven. Drive the joint 2 of the steel pipe sheet pile A so that the joint 3 of the steel pipe sheet pile A meshes with each other.

Next, the steel pipe sheet piles A are driven so that the joints 2 of the existing steel pipe sheet piles A and the joints 3 of the steel pipe sheet piles A mesh with each other, and a predetermined number of steel pipe sheet piles A are driven in the same manner.

In addition, when constructing a well-shaped sheet pile wall, a steel pipe sheet pile C having joints 3 at both diametrical ends of the sheet pile main pipe 1 whose end face on the one end 1a side of the sheet pile main pipe is not closed with a closing member 6 is used as a steel pipe sheet pile wall. The joint 2 of A and the joint 3 of one of the steel pipe sheet piles C are driven so that the joint 2 of the first steel pipe sheet pile B and the other joint 3 of the steel pipe sheet pile C are engaged with each other.

After all the steel pipe sheet piles A, B, and C have been driven in this manner, each of the steel pipe sheet piles A, B, and C is driven again to a predetermined driving depth.

By the way, when the first steel pipe sheet pile B is driven, the closing member 6 preceding the joint 2 pushes away the earth and sand to form an air column 8,
The joint 2 passes through the air column 8.

Therefore, earth and sand will not enter into the joint 2.

Next, when the steel pipe sheet pile A is driven, the joint 3 of the steel pipe sheet pile A passes through the air column 8 formed by the steel pipe sheet pile B that has already been driven, so that too much earth and sand enters into the joint 3. There's nothing to do.

In this way, each steel pipe sheet pile A, B. Since the joints 2 and 3 of C pass through the air column 8 formed by the closing member 6, it is almost impossible for dirt to enter inside.

Therefore, when filling the joints 2 and 3 with water stop material after building the sheet pile wall, the work of discharging the earth and sand within the joints 2 and 3 using a water jet or the like can be done in a short time.

Furthermore, since there is no frictional resistance between the joints 2 and 3 and earth and sand, the driving time is shortened.

In addition, since the end positions of the joints 2 and 3 of the steel pipe sheet pile A on the one end 1a side of the sheet pile main pipe were made different by a length t in the axial direction of the sheet pile main pipe 1, at the time of driving the steel pipe sheet pile A, Even if the steel pipe sheet pile A driven later is driven deeper than the steel pipe sheet pile A driven first, if the difference is shorter than the length t, the closing member of the steel pipe sheet pile A driven earlier. 6 and the joint 3 of the steel pipe sheet pile A driven later will not interfere and damage the closing member 6 and the joint 3.

Also, when driving to a specified depth after completing the driving,
As long as the length t is within the range, the closing member 6 and the joint 3 will not interfere, no matter which steel pipe sheet piles A are used.

When driving steel pipe sheet piles A, if there is an error in straightness during manufacturing or an inclination during construction in any of the adjacent steel pipe sheet piles A, the end of the main sheet pile 1 of steel pipe sheet pile A and the closure. Although interference with the member 6 is a problem, the protrusion length of the closing member 6 is set such that the distance α is formed between the closing member 6 and the main sheet pile 1 when the joints 2 and 3 are engaged. By increasing the length, the interference can be prevented.

In the above embodiments, the joints 2 and 3 are pipe-shaped, but the present invention can be applied to joints 2 and 3 that are box-shaped and various other cross-sectional shapes. .

In addition, in the embodiment, one end 1a of the main sheet pile pipe of the joint 2
Although the closing member 6 is provided at the side end, the closing member 6 may be provided at the end extension position of the joint 2.

By providing the closing member 6 at a position away from the end of the joint 2 on the one end 1a side of the sheet pile main pipe in this way, when there is an obstacle in the soil, the reaction force due to the collision between the obstacle and the closing member 6 can be reduced. does not act on the joint 2, and therefore buckling of the end of the joint 2 can be prevented.

As explained above, according to the steel pipe sheet pile of the present invention, it is possible to prevent earth and sand from entering into the joint.

Further, the driving resistance is thereby reduced, and it is sufficient to provide only one closing member for each pair of joints that are connected to each other.

Furthermore, the closing member is easy to manufacture, unlike a blind plate formed in a conventional joint according to the shape of the end face of the joint.

Furthermore, interference between the joint and the closing member at the ends of the joints that mesh with each other can also be prevented to a certain extent.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partial vertical cross-sectional view of a steel pipe sheet pile, Fig. 2 is a cross-sectional view thereof, Fig. 3 is a cross-sectional view showing a joint meshing part of the steel pipe sheet pile, and Fig. 4. 5 is an explanatory diagram of the construction of the sheet pile wall, FIG. 5 is an explanatory diagram of the action of the steel pipe sheet pile, FIGS. 6 to 7 are side views showing modified examples of the mounting state of the closing plate, and FIGS. 8 a to d are illustrations of the closing plate. FIG. 7 is a schematic cross-sectional view showing a modified example of the shape. A-C...Steel pipe sheet pile, 1...Sheet pile main, 2, 3...
・Joint, 6... Closing member.

Claims (1)

[Claims] 1 A pair of joints are provided along the axial direction on the outer surface of the main sheet pile pipe,
The end positions of both joints on the one end side of the sheet pile main pipe are different from each other in the axial direction of the sheet pile main pipe, and the joint is connected at the end or end extension position of the joint with a shorter distance from the one end of the sheet pile main pipe. A steel pipe sheet pile, characterized in that a closing member is provided that covers substantially the entire end face of the steel pipe sheet pile and projects further outward in the radial direction of the sheet pile main pipe than the joint.