JP2000104251A - Jig for driving steel sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly drive a steel sheet pile by applying a driving load to a gravity center axis position of the steel sheet pile by a vibrohammer. SOLUTION: This jig 2 for driving a steel sheet pile having a holding part by a chuck 14 of a vibrohammer is constituted of a steel sheet jig body 3 which is positioned inside surrounded by a web 10 and both flanges 5 and formed as the holding part and jig flanges 4 which are fixed to the steel sheet jib body 3, arranged along the both flanges 5 of the steel sheet pile 1, and frictionally joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel sheet pile driving jig used for forming a wall in soil or underwater, for example, on an embankment, river revetment, quay of a harbor or landfill.

[0002]

2. Description of the Related Art When a U-shaped steel sheet pile is driven by using a vibratory hammer, vibration is usually applied to the steel sheet pile by directly gripping a web (the bottom part of the U-shaped sheet pile) with a chuck. Cast into the ground.

[0003]

In the above-mentioned casting method,
Since the web is located off the center of gravity of the U-shaped steel sheet pile, the chuck of the vibratory hammer applies an eccentric load at a position away from the center of gravity of the cross section of the steel sheet pile. The vibration blur of the steel sheet pile becomes large, the energy transmitted to the sheet pile tip loses, and the penetration efficiency of the steel sheet pile into the ground decreases. Also,
Noise due to vibration blur also increases.

[0004] Since a steel sheet pile is driven into the ground while applying an eccentric load, the driving load applied to each part of the sheet pile is uneven, so that the deformation of the sheet pile after driving is large, and the deformation due to repeated driving is large. The accumulation of is large.

At this stage, vibro-hammer chucks having almost the same shape have been established on the market, and capital investment is required to change the structure of the chuck in order to improve the above-mentioned disadvantages, resulting in a large economic burden. Therefore, it is actually difficult to change the current structural specification of the chuck.

The present invention has been proposed in view of the above points, and removes an eccentric load at the time of driving a steel sheet pile using a current vibratory hammer, whereby vibration of the vibratory hammer is efficiently transmitted to the tip of the sheet pile. It is an object of the present invention to provide a jig for driving a steel sheet pile.

[0007]

In order to achieve the above object,
The steel sheet pile driving jig of the present invention is a steel sheet pile driving jig provided with a grip portion by a chuck of a vibratory hammer, and when the driving jig is attached to the steel sheet pile, The present invention is characterized in that the grip portion is configured to be located at the center of gravity axis of the steel sheet pile. In the present invention, the driving jig is located inside a web of steel sheet pile and surrounded by both flanges, and is fixed to the steel plate jig main body in which the grip portion is formed, And a jig flange arranged along both flanges of the steel sheet pile. In the present invention, the casting jig is formed in a substantially H-shaped plane by the steel sheet jig body and the jig flange,
The jig flange is detachably provided on the steel sheet pile with a bolt penetrating therethrough and the steel sheet pile flange, and a supporting plate engaging with a flange upper end of the steel sheet pile is fixed to the steel sheet jig body. It is characterized by the following. In the present invention, the grip portion of the steel plate jig body by the chuck is provided so as to be located above the upper end of the steel sheet pile when the driving jig is fixed to the steel sheet pile.

According to the present invention, when the chucking position of the driving jig fixed to the steel sheet pile is gripped by the vibrohammer, the gripping position coincides with the position of the center of gravity of the steel sheet pile. Is transmitted uniformly to each part of the steel sheet pile, so that there is no vibration, the energy loss is reduced, the steel sheet pile can be efficiently penetrated into the ground, and the shape change generated in the sheet pile during driving is small.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, as shown in each figure, a driving jig 2 capable of gripping a position of a steel sheet pile 1 on a center of gravity axis O by a chuck of a vibro hammer is used. 1 is mounted on the upper end portion of the steel sheet pile 1 to temporarily receive the load from the vibratory hammer with the driving jig 2 and then propagate to the steel sheet pile 1 via the driving jig 2.

The casting jig 2 is formed by welding jig flanges 4 to both side edges of a steel plate jig main body 3 formed as a grip portion of a chuck 14 of a vibro-hammer, so that the cross-sectional shape is substantially viewed from above. The jig flange 4 having the H shape is arranged along the flange 5 of the steel sheet pile 1 and the two members are friction-joined with the high-strength bolt 6, and the vibration from the vibro hammer is generated by the friction force. It is transmitted to the steel sheet pile 1.

An attachment plate 7 is also provided on the outside of the flange 5 of the steel sheet pile 1, and the jig flange 4 of the H-shaped driving jig 2 and the attachment plate 7
When the high-strength bolt 6 is used to clamp the sheet pile flange 5, the frictional force between the driving jig 2 and the steel sheet pile 1 can be increased, which is more effective. Steel plate jig body 3 of casting jig 2 gripped by chuck 14 of vibro hammer
Is a plate thickness that does not yield due to the impact load from the vibro-hammer and the weight.

A support plate 8 is integrally provided on the upper end of the jig flange 4 of the H-shaped casting jig 2, and a predetermined distance from the jig flange 4 is provided on the lower surface of the support plate 8. A horizontal movement restricting plate 9 is provided in parallel with the jig flange 4 of the H-shaped driving jig 2 on the upper end of the sheet pile flange 5 of the steel sheet pile 1.
With this structure, the load from the vibratory hammer can be smoothly transmitted to the steel sheet pile 1 even by the support force via the support plate 8. In this case, the supporting plate 8 also has a thickness that does not yield due to the supporting pressure.

Further, if an interposition such as a spacer (or a support rod) is interposed between the steel sheet jig body 3 and the web 10 of the steel sheet pile 1, the driving jig 2 becomes a center axis of the steel sheet pile 1. This is effective in preventing deviation from O (however, illustration is omitted).

[0014]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the casting jig 2, and FIG. 2 is a cross-sectional view of the steel sheet pile with the casting jig 2 installed at the position of the center of gravity of the steel sheet pile, viewed from the upper end of the sheet pile. FIG. 3 is a vertical sectional front view of the casting jig, and FIG. 4 is a side view of FIG.

As shown in the drawings, holes 11 for bolts are made in the upper flange 5 of the steel sheet pile 1, and the chuck of the driving jig 2 is located at an inner position surrounded by the sheet pile flange 5 and the web 10 on both sides. A high-strength bolt 6 in which a steel plate jig main body 3 which is gripped by a jig is installed, and an attachment plate 7 arranged outside both sheet pile flanges 5 and a jig flange 4 arranged inside is passed through holes 12 and 13 for each bolt. Tighten with.

When the depth of the chuck of the vibro-hammer is too large to fit between the driving jig 2 and the web 10 of the steel sheet pile 1, as shown in FIGS. By extending the length of the jig main body 3 upward and projecting from the upper end of the steel sheet pile 1, the chuck can grip the steel jig main body 3.

The present inventor uses steel sheet piles of the same shape,
The casting jig of the present invention is attached to the steel sheet pile barycentric shaft, and the steel sheet jig body 3 is gripped and driven with the chuck 14 of the vibro hammer. When grabbing the web and driving it in,
A casting experiment was performed on the same ground for each. FIG. 5 shows the test results, and FIG. 6 shows the measurement results of the shape of the sheet pile.

FIG. 5 shows that the support layer has a depth of GL-10 m.
The time required for casting to the vicinity is 3 in the conventional method.
In contrast to the conventional method, it took about 2 minutes, and the casting speed was about 30% faster than the conventional method. Further, as shown in FIG. 6, after driving, the steel sheet pile was pulled out, the shape of the entire width of the sheet pile was measured, and the amount of shape change from before the driving was found to be about 3% in the conventional method. However, in the method in which the casting jig of the present invention was attached, the variation was less than 1%, which was smaller than the conventional method. As described above, in the actual steel sheet pile driving test, by mounting the casting jig of the present invention at the position of the center of gravity, the driving speed was increased, and the change in the shape of the steel sheet pile due to the driving was reduced. Has a remarkable effect.

[0019]

By using the sheet pile driving jig of the present invention, the chuck of the vibratory hammer can grip and drive the sheet pile at the center of gravity of the sheet pile. Vibration blur can be suppressed, energy loss is reduced, and the energy of vibration is efficiently transmitted to the tip of the sheet pile, so that the driving speed of the sheet pile can be increased. This leads to a reduction in the construction time and a reduction in the load on a heavy loader such as a vibro hammer.

In addition, since vibration during the sheet pile driving can be suppressed and noise during construction can be reduced, construction can be performed in consideration of the surrounding environment.

Further, since no eccentric load is applied to the sheet pile at the time of driving, the shape change of the sheet pile after driving is small, which is advantageous when the sheet pile is repeatedly used like a leased material.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of a casting jig according to the present invention.

FIG. 2 is a cross-sectional plan view showing a state where the casting jig of FIG. 1 is attached to a steel sheet pile.

FIG. 3 is a vertical sectional front view of FIG. 2;

FIG. 4 is a side view of FIG. 2;

FIG. 5 is a graph showing the results of a casting test.

FIG. 6 is a graph showing the results of measuring the entire width of a sheet pile before and after a casting test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel sheet pile 2 Casting jig 3 Steel plate jig main body 4 Jig flange 5 Sheet pile flange 6 High-strength bolt 7 Side plate 8 Support plate 9 Lateral movement control plate 10 Web 11 hole 12 hole 13 hole 14 Cheak

Claims (4)

[Claims] 1. A jig for driving a steel sheet pile provided with a grip portion by a chuck of a vibrohammer, wherein the grip portion is attached to the steel sheet pile when the driving jig is attached to the steel sheet pile. A jig for driving steel sheet pile, wherein the jig is configured to be positioned at the center of gravity axis. 2. The jig for casting is located inside a web of steel sheet pile and surrounded by both flanges, and has a steel plate jig main body in which the grip portion is formed, and is fixed to the steel plate jig main body. The jig for placing a steel sheet pile according to claim 1, further comprising: a jig flange arranged along both flanges of the steel sheet pile. 3. A casting jig is formed in a substantially H-shaped plane by the steel plate jig main body and a jig flange, and the jig flange is a bolt penetrating therethrough and a steel sheet pile flange. The steel sheet pile driving jig according to claim 1, wherein a support plate is detachably provided on the sheet pile, and a support plate engaged with a flange upper end of the steel sheet pile is fixed to the steel sheet jig body. 4. The steel sheet jig body according to claim 1, wherein a gripping portion of the main body of the steel sheet jig is provided at a position above an upper end of the steel sheet pile when the driving jig is fixed to the steel sheet pile. The jig for driving a steel sheet pile according to any one of claims 1 to 3.