JP2013241818A - Construction method for punching steel pipe sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a vibrational pile punching technology to be improved and applied to a steel pipe sheet pile.SOLUTION: Two compression lines C1 and C2, which are orthogonal to a center line o of a steel pipe sheet pile 4y and which cross each other at an acute angle α, are assumed. Compression mechanisms 61, 71, 62 and 72 are disposed at four locations in which the two compression lines cross a pile wall of the steel pipe sheet pile, and attached to chuck bases 81 and 82. The two chuck bases are integrally and continuously provided. The four compression mechanisms are loosened and fitted to the pile wall, and a joint J of the steel pipe sheet pile is positioned right near the chuck bases.

Description

  The present invention relates to a technique for driving a steel pipe sheet pile into the ground or pulling it out from the ground, and more particularly to a technique for gripping a steel pipe sheet pile by a chuck device attached to a vibration exciter for a vibration pile punching operation.

Background technology

FIG. 2 is a horizontal cross-sectional view schematically showing a main part of a conventional chuck device for gripping a steel pipe pile 4 in order to grip the steel pipe pile 4 and drive it into the ground or pull it out from the ground.
The point o shows the center line of the steel pipe pile 4, and in this figure, the center line is perpendicular to the paper surface.
A straight line C1 orthogonal to the center line o is set, and this is named a pinching line. Clamping mechanisms 2 and 3 are provided at two locations where the pinching line intersects the pipe wall of the steel pipe pile.
The pinching mechanism 2 is constituted by a fixed clamping member 2a and a movable clamping member 2b, and the clamping mechanism 3 is constituted by a fixed clamping member 3a and a movable clamping member 3b.

The fixed clamping member 2a and the fixed clamping member 3a are fixed to a base member (not shown) of the chuck device,
The movable clamping member 2b and the movable clamping member 3b are supported so as to be movable with respect to the base member, and are provided with a power drive means, and can be advanced as indicated by an arrow f or retracted as indicated by an arrow r. Or
When it advances in the direction of arrow f, it approaches the fixed clamping member (2a, 3a) via the tube wall of the steel pipe pile 4 to clamp and grip the tube wall, and when it moves backward in the direction of arrow r, the clamping pressure is released.
Since the pair of fixed clamping members 2a and 3a are fixed to the base member, the length dimension L between the pair of surfaces where each member faces the tube wall is constant.
When the steel pipe pile 4 is gripped by the chuck device, the pair of fixed clamping members 2a and 3a are placed in the steel pipe pile 4 with the movable clamping members 2b and 3b retracted in the direction of the arrow r as shown in the figure. Insert into. For this reason, the gap | interval dimension g of illustration is required at least 3-4 mm.

When the steel pipe pile is clamped and gripped by the conventional chuck device shown in FIG. 2 above, the movable clamping members 2b and 3b advanced in the direction of the arrow f press the pipe wall of the steel pipe pile inward, and the gap described above The dimension g disappears and the tube wall is clamped.
By this action, the steel pipe pile is distorted by the dimension g. The details will be described next with reference to FIG.
The concentric circle F shown with the virtual line in FIG. 3 represents the free shape of the steel pipe pile. The free-form steel pipe pile F has a gap g with respect to the fixed clamping member 2a and 3a.
When the movable clamping members 2b and 2b are pressed in the direction of the arrow P, the free-form steel pipe pile F is distorted into an elliptical shape and clamped and gripped as shown by the symbol D in the drawing.
Since deformation of the gripped steel pipe pile causes various problems, the following “Technology for holding and gripping the steel pipe pile without distortion” was created with reference to FIG. 4. Hereinafter, this technique is referred to as an unknown prior art.

FIG. 4 is a horizontal sectional view schematically showing a chuck device according to an unknown prior art, and corresponds to FIG. 2 showing a horizontal section of a conventional example.
Also in FIG. 4, as in the conventional example (FIG. 2), a pinching line C1 is set in the direction in which the pipe wall of the steel pipe pile 4 is pinched, and the pinching line is sandwiched between each of two places where the pipe wall intersects. A pressure mechanism is provided. However, since the configuration is different from that of the conventional clamping mechanism, the reference numerals are attached to the clamping mechanism 6 and the clamping mechanism 7.

When comparing FIG. 4 (prior art) with FIG. 2 (prior art),
Compared to the pinching mechanism 2 in FIG. 2 comprising a fixed pinching member 2a located inside the tube wall and a movable pinching member 2b located outside the tube wall,
4 is composed of a fixed clamping member 6a located on the inside of the tube wall and a movable clamping member 6b located on the outside of the tube wall.

  4 (prior art) is composed of a fixed clamping member 7a positioned outside the tube wall and a movable clamping member 7b positioned inside the tube wall. ), The arrangement of fixed / movable to inside / outside of the tube is reversed.

  According to the unknown prior art shown in FIG. 4, the two movable clamping members 6 b and 7 b are placed in a state where the two fixed clamping members 6 a and 7 a are in contact with the pipe wall of the steel pipe pile 4. When the steel pipe pile 4 is advanced in the direction of arrow f, the steel pipe pile 4 is clamped and gripped without any distortion (specifically, the action of distorting the pipe into an elliptical shape (FIG. 3) is reduced to a negligible level). be able to.

  Japanese Unexamined Patent Publication No. 7-158067

According to the unknown prior art described with reference to FIG. 4, an excellent practical effect is obtained that the steel pipe pile can be gripped without being distorted. However, this unknown prior art is applied to the steel pipe pile, Trouble occurs when gripping a sheet pile. The problem will be described below.
(Refer to FIG. 5 (A)) When the steel pipe piles 4 are arranged, the steel pipe piles are often connected by a joint J in order to increase the earth retaining strength or improve the water stop performance.
There are various types of joints, three of which are shown in FIGS. 5 (B), (C), and (D).
The steel pipe pile to which the joint is fixed (generally welded) is called a steel pipe sheet pile.

The unillustrated prior art shown in FIG. 4 schematically shows the main members of the operating portion of the chuck device. However, in the actual chuck device, the base member (chuck) on which the fixed clamping member and the movable clamping member are mounted. Base) and a vibrator is installed above the base member.
The base member is a thick steel plate frame and is a large and heavy member.
The member of the code | symbol 4 shown in FIG. 4 is a steel pipe pile, and does not have a joint. If a joint is fixed to this steel pipe pile to form a steel pipe sheet pile, the chuck base and the joint described above interfere with each other, making it difficult to fit the chuck device to the steel pipe sheet pile, or the side of the chuck device as viewed from the operator. The problem that only can be seen occurs.

In view of the above-mentioned circumstances, the present invention adds further improvements to the above-mentioned unknown prior art without damaging the effect of the unknown prior art that there is no risk of distorting the steel pipe into an elliptical shape,
Force can be transmitted evenly in the circumferential direction of the steel pipe forming the steel pipe sheet pile,
An object of the present invention is to provide a technique capable of obtaining a large gripping force capable of transmitting large vibration energy.

The invention according to claim 1 created in order to achieve the above-mentioned object, in the case of gripping the steel pipe sheet pile with a chuck device in order to drive or pull out the steel pipe sheet pile,
Two clamping lines, one clamping line orthogonal to the center line of the steel pipe sheet pile and another clamping line perpendicular to the center line and intersecting the one clamping line at an acute angle, Set,
For each one of the two pinching lines, a pinching mechanism for pinching the pipe wall in the pinching line direction is arranged at each of the two points that intersect the pipe wall of the steel pipe sheet pile. Place the clamping mechanism one by one,
A fixed clamping member located inside the tube wall and a movable clamping member located outside the tube wall are provided in one of the two clamping mechanisms arranged on one clamping line. The other clamping mechanism is provided with a fixed clamping member located outside the tube wall and a movable clamping member located inside the tube wall,
A chuck base for mounting these two sets of clamping mechanisms is disposed above the two sets of clamping mechanisms arranged on each one clamping line,
Two chuck bases, each equipped with two sets of clamping mechanisms, are connected together, and a vibrator is installed above them.
In a state where the movable clamping member provided in each of the four clamping mechanisms is moved in a direction away from the fixed clamping member to form a clamping interval,
Guide the pipe wall of the steel pipe sheet pile into each of the four clamping intervals,
The steel pipe sheet pile joint is positioned in the immediate vicinity of the chuck base.

  The invention according to claim 2 is characterized in that, in addition to the constituent elements of claim 1, each of the pinching mechanisms is mounted on the chuck base so as to be movable in the pinching line direction.

  According to a third aspect of the present invention, in addition to the constituent elements of the second aspect, each of the clamping mechanisms can be rotated about an axis parallel to the center line of the steel pipe sheet pile with respect to the chuck base. It is characterized by being attached.

When the invention of claim 1 is applied, the four ends of the upper end portion of the steel pipe are rotationally symmetric without impairing the effect of the unknown prior art that “the steel pipe forming the steel pipe sheet pile is not distorted elliptically”. Can be gripped to transmit equal force,
The four portions of the upper end portion of the steel pipe sheet pile can be firmly clamped and held without causing interference between the joint provided on the steel pipe sheet pile and the chuck device.

According to invention of Claim 2, it can adapt to a steel pipe sheet pile of a large diameter and a small diameter steel pipe sheet pile,
According to invention of Claim 3, even if the normal line which arranges a some steel pipe sheet pile is bent, it can adapt.

  It is a typical top view showing one example of the present invention.   It is a typical top view for demonstrating the chuck | zipper of a prior art example.   It is explanatory drawing of the effect | action by which a steel pipe is distorted by the chuck apparatus of a prior art example.   It is a typical top view of a chuck concerning an unknown prior art.   It is a typical top view for demonstrating a steel pipe sheet pile and a coupling.   Embodiment different from the above is shown, (A) is an external perspective view, (B) is a bottom view.

FIG. 1 is a schematic plan view showing an embodiment of the present invention, and depicts a state in which a steel pipe sheet pile is about to be driven along a normal line PL.
The steel pipe sheet pile 4y is one steel pipe sheet pile to be driven, and is positioned on the normal line PL. 4Yn drawn in phantom lines is an existing steel pipe sheet pile adjacent to the steel pipe sheet pile 4y, and is located on the normal line PL, and is connected by engaging a joint J with the existing steel pipe sheet pile. ing.
The main components of the chuck device that is to hold the steel pipe sheet pile 4y are arranged in the following procedure. However, the order can be rearranged and is not limited to this order.

The center line o of the steel pipe sheet pile 4y is perpendicular to the paper surface. A pinching line C1 orthogonal to the center line o is assumed.
Assume another clamping line C2 that is orthogonal to the center line o and intersects the clamping line C1 at an acute angle α.
Two places where the pinching line C1 intersects the pipe wall of the steel pipe sheet pile 4y are arranged at two places where the pinching mechanism 61 and the same 71 sandwich the pipe wall, and two places where the pinching line C2 intersects the pipe wall A total of four sets of clamping mechanisms are arranged by arranging the clamping mechanisms 62 and 72 in each of the two.
Each of the four pairs of clamping mechanisms includes a fixed clamping member fixedly attached to the base member of the chuck device, and a driving means supported to be movable in the clamping line direction with respect to the base member. And a movable clamping member. These fixed clamping members and movable clamping members are well-known members commonly called “fixed claws and movable claws”.

The clamping mechanism 61 provided along one of the two clamping lines includes a fixed clamping member 2a disposed inside the tube wall and a movable member disposed outside the tube wall. And a sandwiching member 2b.
A clamping mechanism 71 disposed in rotational symmetry (two phases) with the clamping mechanism 61 along the same clamping line C1 includes a movable clamping member 2b positioned inside the tube wall and an outer side of the tube wall. It has the fixed clamping member 2a located.
The fixed clamping member 2a and the movable clamping member 2b are the same or similar to the fixed clamping member 2a and the movable clamping member 2b in FIG. 4 (unknown prior art) described above, and within the tube wall, The aspect arrange | positioned outside is the same as that in FIG.

The clamping mechanism 62 provided along the other clamping line C2 of the two clamping lines, like the clamping mechanism 61, includes a fixed clamping member 2a located inside the tube wall, A movable clamping member 2b located outside the tube wall,
A clamping mechanism 72 arranged in two-phase rotational symmetry with the clamping mechanism 62 along the same clamping line C2 is a movable clamping member located inside the tube wall, like the clamping mechanism 71. 2b and a fixed clamping member 2a located outside the tube wall.
As a result of the arrangement of the constituent members as described above, the pinching line C1 in which the pinching mechanism 61 and the pinching mechanism 71 are arranged in FIG. 1 is centered clockwise (clockwise) in the drawing. When it is rotated by an acute angle α around o,
The pinching line C1 overlaps the same C2,
The clamping mechanism 61 overlaps with the clamping mechanism 62 including its constituent members,
The pinching mechanism 71 overlaps with the pinching mechanism 72 including its constituent members.

What has been described above with reference to FIG. 1 is the arrangement of the members that directly contact the steel pipe sheet pile 4y. Next, support of these members will be described.
A chuck base 81 is configured to mount and support a clamping mechanism 61 and a clamping mechanism 71 arranged along the clamping line C1. The base of the chuck is generally a frame made of a thick steel plate.
Since the clamping mechanisms 61 and 71 are mounted, the chuck base 81 is positioned above the clamping mechanism and has an elongated shape in the direction of the clamping line C1. In FIG. 1, the outline planar shape is represented by the rectangle long in the pinching line direction.
Similarly, a chuck base 82 to which the clamping mechanisms 62 and 72 are attached is configured.
Two chuck bases 81 and 82 are integrally connected, and a vibrator (not shown) is mounted thereon.

The planar shape of the integrally formed chuck base (81 + 82) is a thick X shape, and has a shape in which two elongated rectangles intersect at an acute angle α.
To grip the steel pipe sheet pile 4y by the chuck device configured as described above,
In advance, a total of four movable clamping members 2b provided in each of the four sets of clamping mechanisms (61, 71, 62, 72) are retracted in a direction away from the fixed clamping member 2a to increase the clamping interval. It forms and guides so that the pipe wall of the steel pipe sheet pile 4y may be fitted in these four pinching intervals.
At this time, the steel pipe sheet pile 4y to be placed has its center line o positioned on the normal line PL and is held with two joints J aligned in the normal PL direction.

When the pipe wall is fitted into the four sandwiching intervals, the position of the chuck device is almost determined, and the rotation around the center point o is allowed.
At this time, the rotational angle position of the chuck device is determined so that the joint J of the steel pipe sheet pile 4y is positioned in the immediate vicinity of the contour of the chuck base connecting body (81 + 82) described above.
If you operate as above,
a. Since it has the structure of the above-mentioned unknown prior art, there is no fear of distorting the steel pipe sheet pile into an ellipse,
b. Since there are four clamping points on the tube wall, a gripping force twice that of the conventional technology that grips two points can be obtained.
c. The four gripping and gripping locations are arranged rotationally symmetrically with respect to the center of the steel pipe sheet pile, so there is no risk of exerting a biased force on the steel pipe sheet pile, and accurate punching is possible.
d. The worker can obtain a field of view in which the operator can easily recognize the work situation without receiving a feeling of intense pressure. This is due to the fact that the joint J is positioned in the immediate vicinity of the chuck base continuous body (81 + 82). This is described in detail in the next paragraph.

“Nearest” is described as “close, close, closest” according to Kojien.
Positioning closest in the present invention means that the driver is positioned as close as possible with normal attention in the operation of positioning the chuck device with respect to the steel sheet pile, and may be in contact with each other. There may be a gap.
Since the steel pipe sheet piles 4y are arranged along the normal line PL, work heavy machinery and workers are located away from the normal line. The line of sight from the operator passes through the center o of the steel pipe sheet pile and is perpendicular to the normal line PL, or in a direction similar to the arrow Eye, as indicated by the arrow Eye in the figure.
For this reason, it is possible to overlook the entire work situation without causing a problem that the pinching mechanism 72 is hidden behind the shadow of the pinching mechanism 62 and cannot be seen.
In addition, there is no risk that the operator may experience a problem that the pinching mechanism 62 is immediately approached and receives a feeling of pressure.

Next, an application example (corresponding to claim 2) of the present invention will be described.
A clamping mechanism 61 composed of a fixed clamping member 2a and a movable clamping member 2b is mounted on the slider 9, and the slider 9 is mounted on the chuck base 1 so as to be movable in the clamping line C1 direction.
Similarly, the pinching mechanisms 71, 62 and 72 are also attached to the chuck base via the slider 9 so as to be movable in the pinching line direction.
If it does in this way, it can adapt to a large diameter steel pipe sheet pile and a small diameter steel pipe sheet pile.

Next, a further application example (corresponding to claim 3) will be described.
The slider 9 is attached to the chuck base so as to be movable in the pinching line direction and rotatable about an axis parallel to the center line of the steel pipe sheet pile 4y.
If it does in this way, it is easy to adapt when the normal line PL is bent or when a deformed steel pipe sheet pile is handled.

FIG. 6 shows an embodiment different from FIG. 1 described above, (A) is an image drawing drawn as an external perspective view, and (B) is a bottom view drawn schematically.
As shown in Figure (B) depicting the bottom view,
A. Two clamping lines C1, C2 intersecting at an acute angle α are set,
B. Clamping mechanisms 61, 62, 71, 72 are provided at locations where the two squeezing lines intersect the tube wall,
C. Each clamping mechanism has a fixed clamping member 2a and a movable clamping member 2b as in FIG. 1 described above.
The vibration exciter 10 is mounted on the constituent members arranged as in the above (i) to (c).
Since the three-dimensional outline of the vibrator is generally a rectangular parallelepiped as seen in FIG. 6A, the planar projection figure appearing in the bottom view of FIG.

In the embodiment shown in FIG. 1 described above, four sets of the clamping mechanisms 61, 71, 62, 72 are mounted on the chuck base connecting body (81 + 82). In this example (FIG. 6), The thick plate-like member (symbol 10p) made of steel having a planar shape similar to the chuck base continuous body is mounted, and this thick plate-like member also serves as the bottom plate of the vibrator 10.
If comprised in this way, the number of components will reduce and the whole apparatus will be reduced in weight.
In addition to reducing material costs due to weight reduction, processing costs are also reduced, handling becomes easier, and energy loss is reduced during vibration pile punching work, thus meeting the social demand for energy saving. Become.

2 ... clamping mechanism 2a ... fixed clamping member 2b ... movable clamping member 3 ... clamping mechanism 4 ... steel pipe pile 4y ... steel pipe sheet pile 4Yn ... adjacent existing steel pipe sheet pile 9 ... slider 10 ... vibrator 10p ... exciter bottom plate 61 , 62, 71, 72... Clamping mechanism C1, C2 .. Clamping line Eye ... An arrow representing the operator's line of sight J ... Joint o ... Center line of steel pipe sheet pile PL ... Normal α ... Acute angle

Claims (3)

When gripping the steel pipe sheet pile with a chuck device in order to drive or pull out the steel pipe sheet pile,
Two clamping lines, one clamping line orthogonal to the center line of the steel pipe sheet pile and another clamping line perpendicular to the center line and intersecting the one clamping line at an acute angle, Set,
For each one of the two pinching lines, a pinching mechanism for pinching the pipe wall in the pinching line direction is arranged at each of the two points that intersect the pipe wall of the steel pipe sheet pile. Place the clamping mechanism one by one,
A fixed clamping member located inside the tube wall and a movable clamping member located outside the tube wall are provided in one of the two clamping mechanisms arranged on one clamping line. The other clamping mechanism is provided with a fixed clamping member located outside the tube wall and a movable clamping member located inside the tube wall,
A chuck base for mounting these two sets of clamping mechanisms is disposed above the two sets of clamping mechanisms arranged on each one clamping line,
Two chuck bases, each equipped with two sets of clamping mechanisms, are connected together, and a vibrator is installed above them.
In a state where the movable clamping member provided in each of the four clamping mechanisms is moved in a direction away from the fixed clamping member to form a clamping interval,
Guide the pipe wall of the steel pipe sheet pile into each of the four clamping intervals,
A steel pipe sheet pile punching method, characterized in that a steel pipe sheet pile joint is positioned closest to the chuck base.   2. The steel pipe sheet pile punching method according to claim 1, wherein each of the pinching mechanisms is attached to the chuck base so as to be movable in the pinching line direction.   3. The steel pipe according to claim 1, wherein each of the clamping mechanisms is attached to the chuck base so as to be rotatable around an axis parallel to a center line of a steel pipe sheet pile. Punching method of sheet pile.

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