JPH10252055A - Easy-to-drive sheet pile structure and driving edge jig therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet pile structure, which is easy to drive and can reduce operating time, and a driving edge jig. SOLUTION: This sheet pile structure forms, at the end of a sheet pile 1, an edge part in the form of an isosceles triangle contained within the same plane as both the front and back faces of the sheet pile 1, e.g. with its lower end being the apex angle, and auxiliary edges converged at lower ends are provided on both sides of the edge part. Also, an edge jig 4 can be freely attached to and removed from the lower end of a normal sheet pile and includes, e.g. an isosceles-triangle-shaped edge head 4a and support pieces 4b, 4c projecting upward from both sides of the edge head 4a to direct both sides of the sheet pile 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to revetment work and civil engineering
BACKGROUND OF THE INVENTION The present invention relates to a sheet pile driven into the ground for earth retaining work at a construction site, and more particularly to a sheet pile structure having a cutting edge or a jig at a lower end of the sheet pile to facilitate driving.

[0002]

2. Description of the Related Art Sheet piles constructed in civil engineering and construction work sites are suspended, for example, by vibratory hammers arranged on the ground side, and are driven down into the ground by vibrating the vibratory hammers. Then, the adjacent sheet piles are closely aligned and arranged to form a protective wall.

As a method for constructing such a sheet pile, there is, for example, a method described in JP-A-59-150821. This is to excavate the ground at the site in advance with an earth auger and drive the excavation hole into the excavated shaft by passing a drilling jig into it, with the aim of facilitating the construction of sheet piles. This is a construction method in which a sheet pile is finally driven after shaping.

FIG. 8 is a schematic view showing a state of driving a sheet pile described in this publication. The lower end of an H-shaped steel excavating jig 52 suspended by a vibratory hammer 51 is previously excavated by an earth auger. A plurality of crushing plates 53 each having a shape that bites into the rock rock on the inner periphery of the shaft which has been set are integrally attached by welding. By providing such a crush plate 53, it is possible to increase the thrust at the time of driving and excavating in the shaft, and to complete the subsequent driving operation of the sheet pile in a short time.

[0005] As described above, in order to facilitate the driving of the sheet pile, it has been conventionally performed to efficiently drive the sheet pile by using the excavating jig 52 before removing the obstacle due to the bedrock or the like. is there.

[0006]

However, according to the above-mentioned publication, a shaft is excavated in advance, and a crush plate 53 is made to penetrate a rock at an inner peripheral portion thereof. This is substantially different from the construction in which the excavating jig 52 is directly driven into the ground. That is, as clearly shown in FIGS. 6 and 7 of the drawings of the publication, the crushing plate 53
The fins are arranged like fins protruding outside the side, and the lower end is formed to extend below the excavation jig 52.

Therefore, when the object having such a crush plate 53 is directly driven into the ground, the excavating jig 5
The crushing plate 53 merely pushes outside the area occupied by the cross section of itself 2 so as to cut the rock. For this reason, the excavating jig 52 not only has its own casting resistance but also the crush plate 53.
Will also be added, and as a result, the driving resistance may increase.

An excavating jig 52 with such a crushing plate 53
It is fully conceivable to improve the excavation efficiency by providing the configuration in the sheet pile itself. However, even if such a configuration of the crushing plate 53 is applied to the lower end portion of the sheet pile as it is, as described above, the increase in the driving resistance received by the crushing plate 53 rather decreases the working efficiency, and the driving efficiency is lowered. At present, efficiency cannot always be improved.

An object of the present invention is to provide a sheet pile structure and a cutting edge jig which can always be easily driven and work time can be reduced even when a sheet pile is directly driven into the ground without excavating a shaft. Aim.

[0010]

According to the sheet pile structure of the present invention, a lower end of a sheet pile made of steel or the like is provided with a cutting edge portion that bites into the ground in advance of other portions in the same plane as the front and back surfaces of the sheet pile. Instead, they are integrally formed.

The driving blade tip jig of the present invention is a driving jig to be mounted on the lower end of a sheet pile made of steel or the like. An equilateral triangular cutting edge head, and a pair of supporting pieces extending upward from both surfaces of the cutting edge head over the upper end thereof. The lower end of the sheet pile is extrapolated between these supporting pieces and the upper end face of the cutting edge head. Abuts against the lower end surface of the sheet pile to be detachably connected.

In the sheet pile structure of the present invention, the cutting edge is formed in an isosceles triangular shape having a vertex at the lower end, and at least one of the front surface and the rear surface of the cutting edge has a cutting surface above the tip of the cutting edge. May be provided with an auxiliary cutting edge that converges.

Further, in the driving blade tip jig according to the present invention, the supporting piece has a thickness substantially the same as that of the blade head, and the lower end thereof is on a bisector passing through the vertex of the blade head. The surface of the support piece facing away from the blade head may be a tapered blade surface whose lower end is tapered.

[0014]

FIG. 1 is a perspective view showing a lower end portion of a sheet pile according to an embodiment of the present invention, and FIG.
1 is a bottom view and FIG. 2B is a front view of a main part.

In the figure, as shown in the conventional example, the sheet pile 1 is suspended at its upper end by a vibratory hammer such as a vibro hammer and driven into the ground by vibrating in the vertical direction while applying vibration. Things. And
In the illustrated example, a so-called “U-shaped” sheet pile having a generally U-shaped cross section is shown.

The U-shaped sheet pile 1 comprises a flange 1a for constructing a protective wall and webs 1b bent from both left and right ends thereof.
1c, these flanges 1a and webs 1b, 1
Each of the lower ends of c is provided integrally with a blade edge portion 2a, 2b, 2c whose tip is tapered in a triangular shape. That is, these cutting edges 2a to 2c are obtained by rolling the sheet pile 1 and then cutting the lower end as shown, and the center cutting edge 2a is formed by the flange 1
a, and the left and right edge portions 2b, 2c are also included in the same plane as the respective webs 1b, 1c.

By forming the cutting edges 2a to 2c integrally with the sheet pile 1 as described above, the respective tapered cut surfaces of the cutting edges 2a to 2c are sharply cut into rock or the like when being driven into the ground. It will be crushed. Since all of the cutting edges 2a to 2c are included in the same plane as the flange 1a and the webs 1b and 1c, there is no member protruding out of the sheet pile as described in the conventional example, and therefore, at the time of driving, The resistance from the ground does not increase. Therefore, the thrust at the time of driving into the ground is sufficiently maintained, and the driving operation can be completed in a short time by setting the sheet pile in the vertical position.

FIG. 3 is a perspective view of a main part showing another example of the sheet pile structure, FIG. 4 (a) is a bottom view thereof, and FIG. 4 (b) is a front view of the main part.

In this example, an auxiliary cutting edge which intersects with the cutting edge portions 2a to 2b is formed in the structure of the example of FIGS. 1 and 2, and the same members as those in the previous example are designated by common reference numerals. I have.

A triangular auxiliary cutting edge 3a, which is integrally formed on the lower end of the flange 1a and has a triangular front shape, is joined to the front and back surfaces thereof by welding a right triangular auxiliary cutting edge 3a. The auxiliary cutting edge 3a is arranged so that the hypotenuse of the right triangle is directed downward, and is located on a line that divides the cutting edge 2a symmetrically as viewed from the front. These auxiliary cutting edges 3a are smaller than half the size of the triangular cutting edges 2a, and as shown in FIG. 4 (a), the amount of protrusion from the flange 1a is small.

The cutting edges 2b, 2c of the webs 1b, 1c
The auxiliary cutting edges 3b and 3c are integrally joined to each other by welding in the same configuration as in FIG.

By providing such auxiliary cutting edges 3a to 3b, as shown in FIG. 4, the cutting edge portions 2a to 2c and the auxiliary cutting edges are formed at the lower end of the sheet pile 1 at three positions in a cross shape as viewed from the bottom. 3a to 3c are arranged. Therefore, in the examples of FIGS. 1 and 3, only the load of the shearing or crushing force on the flat ground by the cutting edge portions 2 a to 2 c, but to the front and back surfaces of the sheet pile 1 by the auxiliary cutting edges 3 a to 3 c. Shear and crushing forces can be propagated. For this reason, a stronger impact can be applied to a rock or the like in the ground, thereby enabling more efficient driving. Further, since the edge portions 2a to 2c are equilateral triangles having a vertex at the lower end, the two inclined surfaces forming the vertex have a line-symmetric inclined surface to the left and right, so that the traveling direction at the time of driving is vertical. Direction can be maintained, and the sheet pile 1 is not driven obliquely.

Here, even if the auxiliary cutting edges 3a to 3c protrude toward the front side and the back side of the sheet pile 1, the cutting edges 2a to 2c
The lower end of the crusher crushes the ground in advance, so that the resistance at the time of driving unlike the conventional crushing plate does not increase.

That is, as is clear from FIGS. 3 and 4B, the blade tips of the blade portions 2a to 2c are lower than the lower ends of the auxiliary blades 3a to 3c. The parts 2a to 2c first strike against earth and sand or rock in the ground. Therefore, in the case of the casting method in which the lowering is performed while slightly vibrating up and down, the auxiliary cutting edges 3a to 3c hit the rock crushed to some extent after the impact of the cutting edges 2a to 2c. The load on 3c can be small, and as a result, the resistance during driving does not increase.

FIG. 5 is a perspective view showing the driving blade edge jig of the present invention and the lower end of the sheet pile. The sheet pile 1 has a flange 1a and its left and right webs 1 in the same manner as shown in the previous example.
b (, 1c) is formed, and one or a plurality of cutting edge jigs 4 are attached to appropriate positions of the flange 1a and the web 1b (, 1c).

The cutting edge jig 4 has the same thickness as the sheet pile 1 and has a triangular cutting edge head 4a having a tapered lower end side, and a pair of support pieces 4b integrally joined to both surfaces of the cutting edge head 4a by welding. , 4c. As shown in the front view of FIG. 6A, the support pieces 4b and 4c are arranged so as to protrude upward from the center of the blade head 4a, and face each other as shown in FIG. The surfaces to be formed are straight fitting surfaces 4d and 4e that are parallel to each other and fit tightly to the flange 1a, and the opposite sides are tapered surface surfaces 4f and 4g whose lower ends are reduced.

The blade jig 4 is attached so that the lower end of the sheet pile 1 is sandwiched between the support pieces 4b and 4c, as indicated by the dashed line arrow in FIG. That is, the distance between the fitting surfaces 4d, 4e of the support pieces 4b, 4c is
If the thickness is slightly larger than the thickness of the sheet pile 1, by hitting the blade jig 4 with a hammer in the direction of the sheet pile 1,
It can be easily attached so as to be in the state shown in FIG.

Note that, even when the distance between the fitting surfaces 4d and 4e is slightly large and the sheet pile 1 is loosely fitted, the upper end of the blade tip head 4a is positioned at the upper end of the sheet pile 1 as shown in FIG.
The blade jig 4 is pushed toward the sheet pile 1 when it is driven into the ground as long as it is held so as to abut against the lower end surface of the sheet.
The posture of the cutting edge jig 4 does not change or the position does not shift. Therefore, there is no need to strictly control the processing accuracy of the support pieces 4b and 4c, and the cutting edge jig 4 can be manufactured at low cost.

The mounting position of the cutting edge jig 4 on the sheet pile 1 can be, for example, one for each of the flange 1a and the left and right webs 1b and 1c as shown in FIG.
Of course, if the width of the sheet pile 1 or the webs 1b and 1c are longer than the size of the cutting edge jig 4, it may be increased accordingly. For example, the cutting edge jig 4 may be provided at the center of the illustrated flange 1a. May be arranged on the left and right in addition to arranging one. In the case of a small sheet pile 1, the cutting edge jig 4 may be attached to only the flange 1a.

Even with such a blade jig 4,
Similar to the cutting edge portions 2a to 2b and the auxiliary cutting edges 3a to 3b integrated with the sheet pile 1 shown in the previous example, the sheet pile 1 can be quickly driven.

That is, the blade head 4a has a triangular shape similarly to the blade portions 2a to 2b of the previous example, and the impact crushing of the rock or the like is promoted by this. Becomes Further, since the blade surfaces 4g, 4f of the support pieces 4b, 4c function as shearing surfaces similarly to the auxiliary blade edges 3a to 3b of the previous example, a strong impact can be applied to a rock or the like in the ground.

Further, since members such as bolts are not required for connecting the cutting edge jig 4 to the sheet pile 1, it is only necessary to attach it to the sheet pile 1 on site if necessary. For this reason, when it is known from a geological survey or the like that the ground is relatively soft without any intervening rock or the like, the ordinary sheet pile 1 may be driven without using the cutting edge jig 4. Therefore, it is preferable in terms of cost and versatility is improved as compared with the case where the cutting edge portion is integrally formed with the sheet pile 1 as a dedicated material.

Further, each of the support pieces 4b and 4c may be formed such that one of the support pieces 4b and 4c is cut so as to have a vertical posture instead of having the tapered blade surfaces 4g and 4f. This simplifies the formation of the support pieces 4b and 4c, and also facilitates the handling when the sheet pile 1 is pulled out of the ground. The support pieces 4b and 4c, whether tapered or vertical straight, serve to relieve the rock load on the jet pipe inserted into the ground when the sheet pile 1 is driven. Can also be performed, which also allows for protection of the jet tube.

In each of the above examples, a U-shaped sheet pile has been described. However, it is needless to say that another type of sheet pile may be used, and the present invention can be applied to a pile sheet or the like.

[0035]

According to the sheet pile structure of the present invention, the crushing force on the rock or the like at the time of driving can be enhanced by the cutting edge portion integrally formed at the lower end of the sheet pile, and the sheet pile having the straight lower end is directly driven. As compared with the installation, the working time can be shortened and the load on the pile driver can be reduced, and the installation work can be facilitated. Further, with the auxiliary cutting edge, the crushing force is enhanced, so that a more efficient driving operation can be performed.

Further, in the driving blade edge jig of the present invention, it is possible to easily attach the supporting piece to the ordinary sheet pile only by externally fitting the supporting piece as necessary, so that the sheet pile does not need to have the blade edge portion formed in advance. We can respond immediately on site. For this reason, it is only necessary to determine whether or not to use the cutting edge jig according to the situation at the site, and since a normal sheet pile can be used as it is, the equipment cost is also reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a sheet pile structure of the present invention.

FIGS. 2A and 2B are details of the sheet pile of FIG. 1, wherein FIG. 2A is a bottom view and FIG.

FIG. 3 is a perspective view showing a main part of a sheet pile structure provided with an auxiliary cutting edge.

4A and 4B are details of the sheet pile of FIG. 3, wherein FIG. 4A is a bottom view and FIG.

FIG. 5 is a perspective view showing a driving blade edge jig and a lower end portion of a sheet pile.

6A and 6B are details of a mounting structure of a cutting edge jig to a sheet pile, wherein FIG. 6A is a front view of a main part and FIG. 6B is a side view.

FIGS. 7A and 7B are details of a mounting position of a cutting edge shaft with respect to a sheet pile, wherein FIG. 7A is a bottom view and FIG.

FIG. 8 is a schematic view showing a conventional sheet pile driving.

[Explanation of symbols]

 Reference Signs List 1 sheet pile 1a flange 1b, 1c web 2a, 2b, 2c cutting edge 3a, 3b, 3c auxiliary cutting edge 4 cutting edge jig 4a cutting edge head 4b, 4c support piece 4d, 4e fitting surface 4g, 4f cutting surface

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tadayoshi Hashimura 9-39-1 Hatae-dori, Nakamura-ku, Nagoya 203 Grand-Nights Nishimura 203 (72) Inventor Hiroshi Nakazawa 2407-1 Yamakita, Kagami-cho, Kami-gun, Kochi Prefecture

Claims (4)

[Claims] 1. An easy-to-punch configuration in which a lower end of a sheet pile made of steel or the like is formed integrally with a cutting edge portion that cuts into the ground in advance of other portions in the same plane as the front and rear surfaces of the sheet pile. Sheet pile structure. 2. An auxiliary cutting edge having an isosceles triangular shape having a vertex at a lower end thereof, and having at least one of a front surface and a rear surface of the cutting edge converging the cutting surface above the tip of the cutting edge. 2. The sheet pile structure according to claim 1, further comprising: 3. A driving jig to be mounted on the lower end of a sheet pile made of steel or the like, comprising a cutting edge head having an approximately isosceles triangular shape having substantially the same thickness as the sheet pile and having a lower end having an apex angle. A pair of support pieces extending upward from the both sides of the blade head over the upper end thereof.The lower end of the sheet pile is extrapolated between these support pieces and the upper end face of the blade head is brought into contact with the lower end face of the sheet pile. A driving blade tip jig for sheet piles that can be detachably connected. 4. The supporting piece has a thickness substantially equal to that of the cutting edge head, and is positioned on a bisector passing through a vertex of the cutting edge head, and a lower end thereof is positioned above the tip of the cutting edge head, 4. The driving blade cutting jig for a sheet pile according to claim 3, wherein the support piece has a tapered blade surface whose lower end is tapered at the surface facing the side opposite to the blade head.