JP2015117505A - Joining method of steel sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a joining method of a steel sheet pile capable of suitably vertically connecting the steel sheet pile, when executing press-in construction of the steel sheet pile, by using a pile press-in machine of combinedly using an auger device.SOLUTION: The present invention adopts a method comprising a process of joining a backing strip 1 to the surface side for arranging an auger casing K of the auger device 20 in an upper end part of one steel sheet pile P, and a process of welding its opposed place in a groove on an opposite surface of the surface side for arranging the auger casing K by opposing the lower end of the other steel sheet pile P to the upper end of the one steel sheet pile P, when vertically connecting the steel sheet pile P in a process of pressing the steel sheet pile P in the ground by using the pile press-in machine 10 of combinedly using the auger device 20.

Description

  The present invention relates to a method for joining steel sheet piles, and more particularly, to a joining method for longitudinally joining steel sheet piles when performing a steel sheet pile press-in operation using a pile presser combined with an auger device.

2. Description of the Related Art Conventionally, a pile press-in machine that presses a pile into the ground by taking a reaction force from an existing pile is known as a device for driving a pile into the ground and burying it.
The pile press-in machine is provided at the lower part of the machine main body and clamps the existing pile, and the chuck device provided at the front end of the machine main body and holding the pile pressed into a position adjacent to the existing pile, It has. This pile press-fitting machine grabs the upper end of the existing pile with the clamp device, and with the reaction force taken from the existing pile, lowers the chuck device that holds the pile to press the pile into the ground It has become.
And when performing the press-in construction of a pile (for example, steel sheet pile) with respect to hard ground using a pile press-in machine, an auger apparatus may be used together (for example, refer patent documents 1, 2, and 3).

In addition, piles such as steel sheet piles are manufactured to the specified dimensions for manufacturing and transportation reasons. After the steel sheet piles are brought into the site, they are joined to the desired length during construction at the site. Is generally done.
For example, as a joining method in which the upper end surface of one steel sheet pile and the lower end surface of the other steel sheet pile are made to face each other and the steel sheet piles are cascaded, the back side gouging is performed after the front side welding of the opposed portions is performed. There are known a method in which the back side is welded and a method in which a back wave welding is performed on the facing part.

Japanese Patent Laid-Open No. 10-195872 JP 2000-64284 A JP-A-11-350482

However, when the steel sheet pile is press-fitted using a pile press-in machine combined with an auger device as in the above-described conventional technology, the auger casing of the auger device is disposed close to the back side of the steel sheet pile. There arises a problem that gouging and welding cannot be performed on the back side of the portion where the steel sheet piles are opposed to each other.
In addition, there is no work space behind the steel sheet pile for back wave welding, but back wave welding is a work that requires skill, and the quality of the welded part depends on the skill of the welding operator, so it is stable. This causes a problem that it is difficult to ensure the bonding strength.

  The objective of this invention is providing the joining method of the steel sheet pile which can connect a steel sheet pile suitably longitudinally, when performing the press-fitting construction of the steel sheet pile using the pile press machine which used the auger apparatus together.

In order to solve the above problems, the invention described in claim 1
In the process of press-fitting a steel sheet pile into the ground using a pile presser combined with an auger device,
A step of joining a backing metal to the surface side where the auger casing of the auger device is arranged at the upper end of one steel sheet pile;
A step of facing the lower end of the other steel sheet pile to the upper end of the one steel sheet pile, a surface opposite to the surface side on which the auger casing is disposed, and groove welding the facing portion;
It is characterized by providing.

Invention of Claim 2 is the joining method of the steel sheet pile of Claim 1,
After groove-welding the one steel sheet pile and the other steel sheet pile, a step of joining an attachment plate to the face-welded surface side of the one steel sheet pile and the other steel sheet pile is provided. And

  According to the present invention, even in the process of press-fitting a steel sheet pile into the ground using a pile press-in machine combined with an auger device, the steel sheet pile can be suitably cascaded.

It is the schematic which shows the pile press-fit machine of this embodiment by side view. It is explanatory drawing regarding the process of joining a backing metal to the upper end part of one steel sheet pile, (a) which looked at the steel sheet pile in plane, and (b) which looked at the side. It is the top view (a) which shows the backing metal used for joining of a steel sheet pile, and a side view (b). It is explanatory drawing regarding the process of groove-welding the location which made the upper end of one steel sheet pile face the lower end of the other steel sheet pile, and is sectional drawing (a) in the AA line of FIG.4 (b), and a steel sheet pile Is a side view (b). It is explanatory drawing regarding the process of joining an attachment board to the surface side which carried out the groove welding of one steel sheet pile and the other steel sheet pile, (a) which planarly viewed the steel sheet pile, and (b) which looked at the side is there.

  Hereinafter, an embodiment of a steel sheet pile joining method according to the present invention will be described in detail with reference to the drawings.

First, a pile press-in machine 10 used when press-in a pile such as a steel sheet pile P into the ground will be described.
As shown in FIG. 1, the pile press-in machine 10 is a machine that grips a steel sheet pile P with a chuck device 15 and press-fits it into the ground, and is an existing steel sheet pile P (existing pile P) already embedded in the ground. A saddle 12 provided with a plurality of clamping devices 11 that hold and support the upper end side, a slide base 13 that can move back and forth with respect to the saddle 12, a leader mast 14 that can pivot left and right on the slide base 13, and a leader A chuck device 15 attached to the front surface of the mast 14 so as to be movable up and down, and a main hydraulic cylinder 16 that drives the chuck device 15 up and down relative to the leader mast 14 are provided.

This pile press-in machine 10 can be used together with the auger device 20 when press-fitting the steel sheet pile P into the hard ground. In this embodiment, the auger device 20 is inserted into the chuck device 15 so that the pile press-in machine 10 performs the pile press-in construction by the auger combined use method. That is, the pile press-in machine 10 functions as a press-in device that press-fits the steel sheet pile P and the auger device 20 into the ground.
The auger device 20 includes an auger screw S provided at the tip of the auger head H so that the auger head H can be replaced, a substantially cylindrical auger casing K that covers the periphery of the auger screw S, a drive motor M that rotates the auger screw S, and the like. (See FIG. 1). The configuration and operation of the auger device 20 are the same as those conventionally known and will not be described in detail here.

The clamp device 11 is provided on the lower surface of the saddle 12. For example, the clamping device 11 can grip and grip the upper end portion of the steel sheet pile P by driving a hydraulic cylinder (not shown) in a state where the upper end side of the existing steel sheet pile P press-fitted is sandwiched. That is, the clamp device 11 functions as a fixing means for fixing the pile press-fitting machine 10 to the upper end portion of the existing pile P by grasping the existing pile P.
In particular, the clamping device 11 takes the reaction force from the existing steel sheet pile P that is held and supported, and the pile presser 10 newly presses the steel sheet pile P or pulls out the embedded steel sheet pile P. The pile presser 10 is fixed to the upper end of the existing pile P and installed.
In addition, since the structure of the clamp claw which consists of the fixed clamp claw with which the clamp apparatus 11 is equipped, and a movable clamp claw, the hydraulic cylinder which drives a movable clamp claw, and the operation | movement in which a clamp claw grasps the steel sheet pile P are known here. Not detailed.

  The slide base 13 moves forward with respect to the saddle 12 and moves the chuck device 15 together with the leader mast 14 to the front side, thereby supporting the leading clamp device 11 without moving the saddle 12. Two new steel sheet piles can be arranged in the front-rear direction and sequentially press-fitted in front of the existing steel sheet pile P.

The leader mast 14 moves back and forth integrally with the slide base 13.
Further, the leader mast 14 turns right and left with respect to the slide base 13 and changes the direction of the chuck device 15 to bend the direction of the row of piles that are sequentially press-fitted in a right angle or bend in a curved manner. It is possible.

The chuck device 15 is in a state in which the back side thereof is fitted to the front side of the leader mast 14 so as to be movable up and down, and is driven up and down by a main hydraulic cylinder 16 connected to the leader mast 14 and the chuck device 15. ing.
In addition, a pile chuck portion (not shown) for holding the steel sheet pile P and a casing chuck portion (not shown) for holding the auger casing K of the auger device 20 are provided inside the chuck device 15. The steel sheet pile P and the auger casing K inserted through the chuck device 15 can be held and held by a pile chuck portion or a casing chuck portion that is operated by driving a hydraulic cylinder (not shown). In addition, since the structure and operation | movement of each chuck | zipper part with which the chuck | zipper apparatus 15 is provided, and the hydraulic cylinder which drives each chuck | zipper part are known, it does not elaborate here.

  When the steel sheet pile P or auger casing K (auger apparatus) gripped by the chuck device 15 is press-fitted into the ground, the lifting range of the chuck device 15 is limited. The lowering of the chuck device 15 and the lifting of the chuck device 15 by separating the steel sheet pile P and the auger casing K are repeated. Thus, the steel sheet pile P and the auger casing K are repeatedly press-fitted for each stroke in which the chuck device 15 moves up and down, and the steel sheet pile P and the auger casing K are pressed into the ground deeper than the lifting range of the chuck device 15. Is possible.

The above-described pile press-in machine 10 is configured to press-fit a new steel sheet pile P with the chuck device 15 before the existing pile P (existing steel sheet pile P), and to clamp and release the upper end of the existing pile P by the clamp device 11. And the movement of the slide base 13 back and forth with respect to the saddle 12 can be combined to move on the pile row composed of the existing piles P.
In addition, since the operation | movement which the pile press-fit machine 10 self-propels on a pile row is known, it does not elaborate here.

  Next, in the process of press-fitting the steel sheet pile P into the ground using the pile press-fitting machine 10 combined with the auger device 20, a method for joining steel sheet piles that longitudinally join the steel sheet pile P will be described.

Since the steel sheet pile P is manufactured to a predetermined dimension for manufacturing and transportation reasons, the steel sheet pile P is joined to a required length at the time of construction on site.
And when connecting steel sheet pile P longitudinally in the process of press-fitting steel sheet pile P into the ground using pile press-in machine 10 combined with auger apparatus 20, first, one steel sheet pile P is press-fitted to a predetermined depth.
Next, as shown in FIGS. 2 (a) and 2 (b), the backing metal 1 is fillet welded to the surface side where the auger casing K of the auger device 20 is disposed at the upper end of one steel sheet pile P. Join. At this time, the auger casing K is arranged close to the back surface side of the steel sheet pile P. For example, the pile chuck portion that holds the auger casing K while holding the auger casing K by the casing chuck portion of the chuck device 15. By shifting the position in the horizontal direction, a gap in which the backing metal 1 can be inserted between the auger casing K and the steel sheet pile P can be created.

The backing metal 1 is a joining member formed by matching a flat steel plate with the shape of the steel sheet pile P, and has a shape along the back surface of the steel sheet pile P.
As shown in FIGS. 3 (a) and 3 (b), the backing metal 1 includes a flat portion 1a along the web portion of the steel sheet pile P, and a bend along the flange portion of the steel sheet pile P on both sides of the flat portion 1a. The parts 1b and 1b are provided.
For example, the backing metal 1 is a U-shaped steel sheet pile II type, III type, IV type, VL type, VIL type, IIw type, IIIw type, IVw type, hat type steel sheet pile 900 (10H, 25H), Various types of hat-shaped steel sheet piles corresponding to 600 mm width (earth retaining steel NS-SP-J for close construction) are prepared.

Next, as shown in FIGS. 4A and 4B, in order to join the other steel sheet pile P, which is a new steel sheet pile, to the one steel sheet pile P being press-fitted, the other steel sheet pile P is joined to the upper end of one steel sheet pile P. The lower end of the steel sheet pile P is arranged to face each other.
Then, gouging is performed on the surface of the steel sheet pile P opposite to the back side where the auger casing K is disposed, with one steel sheet pile P and the other steel sheet pile P facing each other, and groove welding is performed. . The weld bead 2 is formed between the steel sheet piles P by this groove welding, and one steel sheet pile P and the other steel sheet pile P are joined (see FIG. 4A). The groove angle θ is preferably 45 ± 5 [°].
Moreover, it is preferable to join the other steel sheet pile P and the backing metal 1 by fillet welding after groove welding.

Next, as shown in FIGS. 5 (a) and 5 (b), the joining plates 4 and 5 are joined by fillet welding to the surface side where the groove welding of one steel sheet pile P and the other steel sheet pile P is performed. .
The splicing plates 4 and 5 are steel plates that are welded across one steel sheet pile P and the other steel sheet pile P to join the one steel sheet pile P and the other steel sheet pile P together.
Here, a relatively large diamond-shaped attachment plate 4 is joined to the web portion of the steel sheet pile P, and a relatively small substantially rectangular attachment plate 5 is joined to the flange portion of the steel sheet pile P. ing.
The welded plates 4 and 5 are straddled across one steel sheet pile P and the other steel sheet pile P, and the welded portion can be reinforced by welding along the surface.

Thus, after joining one steel sheet pile P and the other steel sheet pile P in cascade, the press-fitting construction of the steel sheet pile P is continued.
And until the steel sheet pile P reaches a predetermined depth, in other words, until the steel sheet pile P cascaded has a required length, the joining of the steel sheet piles P is repeated.

Thus, according to the joining method of the steel sheet pile of this embodiment, since the auger casing K is obstructed and the backside of the steel sheet pile P cannot be gouged or welded as in the conventional technique, Does not require welding.
And steel sheet pile P can be joined by comparatively simple techniques, such as fillet welding of backing metal 1, groove welding to the surface of steel sheet pile P, and fillet welding of attachment plates 4 and 5. Therefore, regardless of the skill of the welding operator, it is possible to form a sound bead without defects, and it is possible to improve the quality of the welded part and the construction efficiency.

As mentioned above, according to the joining method of the steel sheet pile of this embodiment, even in the process of press-fitting the steel sheet pile P into the ground using the pile presser 10 combined with the auger device 20, the auger casing K and By using the backing metal 1 that can be inserted into the gap with the steel sheet pile P, one steel sheet pile P and the other steel sheet pile P can be suitably longitudinally connected.
In particular, by using the backing metal 1 matched to the shape of the steel sheet pile P, the backing metal 1 can be arranged so as to be in close contact with the back surface of the steel sheet pile P, and the groove to the surface of the steel sheet pile P can be arranged. When welding is performed, it is possible to prevent the molten metal from falling to the back side of the steel sheet pile P.
And the quality of a welding part can be improved by preventing the fall of the molten metal to the back side of the steel sheet pile P at the time of groove welding using the backing metal 1, and the steel sheet piles P with good joint strength. Can be joined.

  The application of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Backing metal 2 Welding bead 3 Attachment plate 4 Attachment plate 10 Pile press-fit apparatus 15 Chuck apparatus 20 Auger apparatus K Auger casing P Steel sheet pile (existing pile)

Claims (2)

In the process of press-fitting a steel sheet pile into the ground using a pile presser combined with an auger device,
A step of joining a backing metal to the surface side where the auger casing of the auger device is arranged at the upper end of one steel sheet pile;
A step of facing the lower end of the other steel sheet pile to the upper end of the one steel sheet pile, a surface opposite to the surface side on which the auger casing is disposed, and groove welding the facing portion;
A method for joining steel sheet piles. After groove-welding the one steel sheet pile and the other steel sheet pile, a step of joining an attachment plate to the face-welded surface side of the one steel sheet pile and the other steel sheet pile is provided. The method for joining steel sheet piles according to claim 1.

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