JPH0320340Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention is based on the lower PC suspended in an excavated underground hole.
This invention relates to a PC pile joining jig that is used when welding the lower face material of the upper PC pile to the upper face material of the pile.

[Conventional technology] Conventionally, PC piles are connected by attaching the lower surface of the upper PC pile that is suspended and supported by a pile driver to the upper surface material of the lower PC pile that is suspended in an excavated underground hole. This was done by welding the face plates of both piles in contact with each other in this state. When there is a protruding deformation of the corner of the facing material due to the slope of the facing material) or contact with other objects, it is difficult to connect the upper and lower PC piles concentrically.

This kind of inconvenience, for example,
As proposed by Publication No. 61387,
A cylindrical positioning piece that covers the welded joints of the upper and lower PC piles and can be opened and closed, and is configured to hold the butted ends of the upper and lower PC piles and weld through the window formed in the positioning piece. This can be resolved by

However, in this case, it is not possible to weld larger than the window formed in the positioning piece.
After temporarily welding a part of the circumferential direction and removing the positioning piece, the entire circumference must be welded, resulting in a two-step welding process.Moreover, the positioning piece, which is quite heavy, must be manually welded. Then, it had to be lifted into position and attached to and detached from the butt ends of the upper and lower PC piles, resulting in low work efficiency and safety issues.

In addition, as in Japanese Patent Publication No. 57-5934, a tower is installed at the edge of the opening of an excavated underground hole, and an upper holding device for holding the upper end of the pile is attached to the top of the tower via a center hole jack. A similar lower holding device is provided at the lower part of the tower in a fixed position, and with the upper end of the first pile body held by the upper holding device, the first pile body is moved together with the upper holding device. When the first pile body is lowered and held by the lower holding device, the upper holding device is raised to hold the upper end of the other second pile body, and in this state, the second pile body is held by the lower holding device.
A device is also known in which the pile body and the upper holding device are lowered, and the lower end of the second pile body is butted against the upper end of the first pile body and welded.

However, in this case, the upper holding device requires a lifting stroke that is approximately equal to the length of the pile body, so when dealing with a long pile body such as a general PC pile, it is difficult to use it as a tower. Something significantly higher is required. Moreover, in order to hold a long pile such as a PC pile in the upper holding device of a tall tower, the pile must be lifted from the tower to a position higher than the length of the long pile. . For this reason, the equipment is very large-scale, and when performing this kind of work with a pile driver, two of the towers are required.
There is a problem that a pile driver with a lifting stroke more than double that is required.

[Problems to be Solved by the Invention] The purpose of the invention is to provide a PC pile joining jig that can solve the problems of the conventional example described above.

[Means for Solving the Problems] In order to achieve the above object, the technical means taken by the present invention are as follows. That is, the PC pile joining jig according to the present invention is a PC pile joining jig used when welding the lower face material of the upper PC pile to the upper face material of the lower PC pile suspended in an excavated underground hole. A first pile that can be opened and closed around an axis parallel to the pile axis that holds the vicinity of the lower end of the upper PC pile on a base that can be raised and lowered along a rail installed on the leader of the pile driver. The retainer and the second pile retainer, which can be opened and closed around an axis parallel to the pile axis that holds the vicinity of the upper end of the lower PC pile, are arranged in a concentric manner with a gap for welding work in the vertical direction. It is characterized by being attached to.

[Function] According to the above configuration, by holding the upper and lower PC piles with the first pile holder and the second pile holder, the upper and lower PC piles are concentric regardless of the slope of the facing material, etc. It is kept in the same condition.

The first pile holder and the second pile holder are provided with a gap for welding in the vertical direction, so the first pile holder holds the vicinity of the lower end of the upper PC pile,
While the second pile retainer holds the upper end portion of the lower PC pile, the face materials of the upper and lower PC piles can be welded all around.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

In the figure, 1 is a pile driver, and the front part of it is
A jig 2 for connecting PC piles is equipped. The PC pile coupling jig 2 is inserted into a pre-formed excavated underground hole 3, and is connected to a lower PC pile 6 in a hanging state that is suspended and supported by a frame 5 via a rope 4, and the pile driver. The upper PC pile 7, which is suspended and supported by the PC pile 1, is held concentrically by the pile retainer 8, which has an approximately cylindrical shape as a whole. It is used to weld and connect the face members 10 and 11 of the piles 6 and 7. 1
5 is a leader installed at the front of pile driver 1, 1
6 is a pair of rails attached to the leader 15;
A base 7 is movable up and down along the rail 16.

As shown in FIGS. 2 and 3, the PC pile coupling jig 2 is attached to the base 17 and opens and closes around a shaft 26 parallel to the pile axis that holds the vicinity of the lower end of the upper PC pile 7. A first pile holder 8A consisting of possible semi-cylindrical members 8a and 8a', and a semi-cylindrical member that can be opened and closed around an axis 26 parallel to the pile axis that holds the vicinity of the upper end of the lower PC pile 6. Second pile retainer 8 consisting of 8b, 8b'
B are attached concentrically in the vertical direction with a gap 9 for welding work in between. 19...
is a fixing mechanism that fixes the first pile holder 8A and the second pile holder 8B in a closed state.

In addition, a first pile holder 8A that can be opened and closed is mounted on a base 17 that can be raised and lowered along the rail 16 of the leader 15.
Since the second pile holder 8B is attached, it is sufficient for the leader 15 to be slightly longer than the length of one PC pile 7.

[Effects of the invention] Since the present invention has the above-described configuration, it can achieve the following effects.

Since the first pile holder and the second pile holder are vertically separated by a gap for welding work, the first pile holder holds the vicinity of the lower end of the upper PC pile, and the second pile holder holds the lower end of the upper PC pile. While holding the upper end of the lower PC pile with the two-pile retainer, without temporary welding,
The face materials of the upper and lower PC piles can be welded all around, and the first and second pile retainers can be moved up and down by raising and lowering the base, so manual lifting is not required. This can improve work efficiency and is also advantageous in terms of safety.

Since the first pile holder and the second pile holder can be opened and closed and are attached to a base that can be raised and lowered, a relatively short lifting stroke is sufficient as a pile driver, and it can also be used for towers that are longer than the pile length. Not necessary.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a pile driver, Fig. 2 is a side view of a PC pile coupling jig, and Fig. 3 is a schematic plan view of the main parts. 3...Drilled underground hole, 6...Lower side PC pile, 7...
...Upper PC pile, 8A...First pile retainer, 8B...
...Second pile holder, 9...Gap for welding work, 1
0,11...Face material, 15...Leader, 16...
Rail, 17...Base.

Claims (1)

[Scope of utility model registration request] This is a PC pile joining jig used for welding and joining the lower side material of the upper PC pile 7 to the upper side material of the lower side PC pile 6 suspended in an excavated underground hole, and is a leader 15 of a pile driver. A first pile holder 8A that can be opened and closed around an axis parallel to the pile axis that holds the vicinity of the lower end of the upper PC pile 7 is mounted on a base 17 that can be freely raised and lowered along a rail 16 provided on the lower side. A second pile retainer 8B that can be opened and closed around an axis parallel to the pile axis that holds the vicinity of the upper end of the PC pile 6 is attached concentrically with a gap for welding work in the vertical direction. PC pile joining jig 8 characterized by the following.