JPH0227021A - Pile center setting method for casing driver and positioning steel plate used therefor - Google Patents

Abstract

PURPOSE:To facilitate centering and transferring when a digging work is conducted by using one plate of a set of two pile centering steel plates, conducting beforehand the next pile centering with the other steel plate, and enabling the next digging right after the completion of the preceding digging. CONSTITUTION:A casing driver for the pressing in and pulling out of a large diameter steel pipe pile, when it grasps a casing and conducts pressing in/pulling out, is needed to be set to a pile center. Therefore, pile centering is set by using two positioning steel plates 20 through the positioning of the other steel plate at the next pile position, while the casing driver is fixed by being suspended with a crane, on one steel plate already positioned, and a digging work is being conducted. And the casing driver is set on the other steel plate at the time of the completion of the preceding pile digging, and at the same time, one steel plate is again set at the next pile position. As a result, easy centering and transferring can be done.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a casing driver with one pile core for press-fitting and pulling out large-diameter steel pipe piles or steel pipes used in construction and civil engineering foundation work. This article describes how to set it up and the equipment used for it.

[Conventional technology]

An example of a working state diagram for press-fitting and pulling out steel pipes using the casing driver 1 is shown in FIG. 31. That is, the rotating reaction force absorbing stand 1 is connected to the casing driver 2, and the excavator 4 for digging into the casing 3 is placed on the stand 1 to carry out the work. Here, to briefly explain the casing driver 2, the casing driver 2 includes a base frame 2a which is held horizontally by four jacks 2el, and a thrust cylinder 2b1 which can be raised and lowered along the base frame 2al. It is composed of a ring-shaped four-descent frame 2c attached thereto, and a casing holding device #2d with a band attached to the elevating frame 2cl and rotated by a motor or the like.

First, the casing 3 is chucked by the band of the casing holding device 2d, the casing holding device 2d is rotated or swung by a motor, etc., and the casing 3 is press-fitted into the ground without contracting the thrust cylinder 2b. The earth and sand in the casing 3 is excavated and removed by a bucket 5 of an earth drill shown as an excavator 4 or by a hammer grab packet or the like (not shown).

Here, a conventional method for setting a pile core in a casing driver will be explained with reference to FIGS. 4 and 5.

Figure 4 is a plan view showing the dowel rod for aligning the pile cores;
FIG. 5 is a side view of the casing driver for explaining the pile core setting method. First, 10 dowel rods made of reinforcing bar etc.
Align the fork point of the cross with the center of the stake and place it on the ground.

Then, as shown in FIG. 5, the casing driver 2 is hoisted up by a single crane 11, and the IC worker 12 gets on top of it and visually checks the cylindrical part of the casing holding device 2d and the circular part 10a of the dowel rod 10 from above. While aligning them, lower the pin and set it.

[Problem to be solved by the invention]

In the conventional setting method described above, it is difficult to align the positions, so this operation has to be repeated several times, which is inefficient. Also, if the worker
I had to ride on top of the car, which was extremely dangerous.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a casing driver that can easily and safely align the center of piles, and that can perform relocation work efficiently. To provide a pile core setting method and a positioning iron plate used therein.1.

[Means to solve the problem]

In order to achieve this object, the method of setting a pile core for a casing driver according to claim 1 involves preparing two positioning iron plates, and placing the positioning iron plate at the next pile position during excavation work. After the laying and excavation work is completed, hang the casing driver with a crane and set it to the positioning iron plate that was set at the pile position 1, and use the positioning iron plate that was used during the previous excavation work. This involves repeatedly setting the iron plate to the next pile position. Further, the positioning iron plate according to claim 2 is an iron plate having a size on which the casing driver can be mounted, and has a hole penetrating the casing in the center of the iron plate, and a float for the jack of the casing driver on the upper surface. It is equipped with a guide plate to prevent it from moving at least one inch in the left and right directions, and a hanging device for hanging it with a crane.

[Effect]

Since I prepared two iron plates for positioning, I am currently doing excavation work using a casing driver.

Next pile hole position I You can set the unused positioning iron plate here, so it is necessary to remove the positioning iron plate placed under the casing driver each time you move the r-sing driver. It is efficient and has no problems. In addition, a steel plate for positioning is laid at one pile hole position, and the casing driver can be set along one guide plate provided on the iron plate for positioning, making it easy and safe to set the pile core of the casing driver. You can do it.

Furthermore, by installing the casing driver via the positioning iron plate, it can be set in a stable state even on soft ground.

[Implementation Ga]

Hereinafter, one embodiment of the present invention will be explained using FIGS. 1 and 2.
Let me explain in detail. FIG. 1 is a plan view showing a positioning iron plate, and FIG. 2 is a side view thereof. The positioning iron plate 20 has a size that allows the casing driver 2& to be mounted thereon, and has a hole in its center that passes through the casing. In addition, on the top surface, there are attached guide plates 20b for positioning the floats 2e and 2e' of the four jacks 2e to which the casing driver 21 is attached. A hanging device 20C is provided.

First, place the positioning iron tool 20 on the ground at the appropriate place.
The sling attached to c is used to lift the positioning iron plate 20 with a crane via a rope 21. Then, the intersection point of the cross section of the dowel rod 10 is lowered so that it is aligned with one pile core, and a positioning iron plate is set at the position of the pile. After removing the sling rope 21 and dowel rod 10, the casing driver 2 is lifted up by the crane 11, and the float 2e of the jack 2e of the casing driver 2 is aligned with the position of the guide plate 20b and lowered. This completes the setting of the casing driver 2 to the pile core position. As a result,
Ground] Since the casing driver 2 is installed via the iron plate for positioning, it is possible to support the casing driver in a wide installation area, and even when the ground is soft, it can be set in a stable state. can.

In addition, in this embodiment, the pile core position was set using the dowel rod 101, but the positioning iron plate 2 was set without using the dowel rod.
It is also possible to draw a circle on the ground that is the same as the hole 20a of ゜ and match it to that circle.

Prepare two iron plates 20 for positioning, set the iron plate 2o for positioning at the next pile hole position while excavating with the casing driver 2 IC, and after completing the excavation work, remove the casing driver 2 with a crane. If it is lifted up and moved, there is no need to remove the positioning iron plate 20 placed under the casing driver 2 each time, which is efficient.

Also, in one case, the guide play) 20bl is 4
The position of the jack 2e was fixed once, but in cases where it is not necessary to fix the jack 2e, it is recommended to
-) It is possible to set the casing driver 2 for one pile core by providing a cylindrical guide plate whose radius is the outermost diameter part of the pile core 2e and fitting the guide plate into the guide plate.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

According to the construction method of claim 1, since two iron plates for positioning are prepared, the relocation work can be carried out efficiently.

Furthermore, since the casing driver is installed via the iron plate for positioning, the machine can be set in a stable state even on soft ground.

Moreover, according to the positioning iron plate 1 according to the second aspect of the present invention, the positioning of the casing driver with respect to the pile core can be easily and safely performed.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the iron plate for positioning of the present invention;
The figure is a side view, the third factor is a side view showing the state of excavation work by the casing driver according to the present invention, Fig. 4 is a plan view showing the dowel rod used in the present invention, and Fig. 5 is a conventional casing. It is a side view explaining the setting method of a driver to a pile core. 2... Casing driver, 2e... Jacket,
2e: Float, 20- Iron plate for self-positioning * 20 a: Biting hole. 20b...Guide plate, 20c...Hanging tool O Fig.

Claims (1)

[Claims] 1. Prepare two iron plates for positioning, and while excavating work, lay the iron plate for positioning at the next pile position, and after completing the excavation work, hang the casing driver with a crane. At the same time as setting the positioning iron plate on top of the positioning iron plate set at the pile position, repeating the process of setting the positioning iron plate used during the previous excavation work at the next pile position. Features a pile core setting method for casing drivers. 2. An iron plate large enough to mount the casing driver, with a hole in the center of the iron plate that passes through the casing, and a hole on the top surface to prevent the casing driver jack float from moving at least left and right and front and back. A positioning iron plate characterized by having a guide plate for fixing and a hanging device for hanging with a crane.