JPS635529B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pile press-in device, and more specifically, it is used for underpinning work performed in a narrow work area at the bottom of a structure, that is, for adding piles to a construction foundation. This invention relates to a pile press-in device that uses the gravity of a suitable structure as a reaction force.

As is well known, during construction work, uneven settlement of buildings can occur when the existing foundation piles do not reach the supporting layer sufficiently, or when the piles are affected by negative friction after construction. . In this case, underpinning to reinforce the existing foundation,
In other words, it is necessary to carry out pile increase work. As shown in Figure 3, this pile increase work involves digging beneath the structure and press-fitting separate piles to the required depth at the bottom of the footing near the existing piles A. It is formed by joining unit steel pipes of 1 m in diameter and 30 to 50 cm in diameter. A jack is inserted between the bottom surface of the structure's foundation, the movement of the structure is used as a reaction force, and the unit steel pipes are successively pressed into the ground using this jack. Each unit steel pipe is successively added by welding to reach the required depth. However, with such conventional construction methods, it is necessary to remove the jack every time the pile is press-fitted to the required depth, and to reinstall the jack at the upper position where the next unit steel pipe is to be press-fitted between the bottom surface of the foundation and the foundation. This, combined with the narrow working area, resulted in poor work efficiency and the disadvantage that the installation of the jacks, which weighed a considerable amount of weight (approximately 100 kg), was done manually, making accidents more likely.

In consideration of the above points, the present invention is designed to allow the jack to be placed extremely easily on the underside of the building foundation and mechanically at a predetermined location.

An example of the implementation of the present invention is shown below in Figures 1 and 2.
The diagram will be explained. A telescoping column 5 consisting of a hydraulic cylinder 3 and a plunger 4 is erected on an underframe 2 having a traveling mechanism (crawler) 1 by a hydraulic motor, and the telescoping column 5 is supported cantilevered on the upper end of the plunger 4 to rotate horizontally. A telescoping arm rod 9 consisting of a hydraulic cylinder 7 and a plunger 8 is horizontally mounted on a block 6 which is provided in a horizontal manner. There is. In addition, 12 is a rotary handle for adjusting the telescoping degree of the telescopic arm rod 9, 13 is a tightening ring for preventing the rotation of the plunger 4 of the telescoping column 5, and 1
4 and 14 are the pressure oil hose installation ports of Jatuki 10,
15 is a driver's seat and is equipped with an engine 16 directly connected to a hydraulic pump.

The pile body press-in device according to the present invention has the above-mentioned configuration, and when using it, the jack 10 is connected to the lower surface of the structure foundation and the required number of piles to be increased, as in the case of the conventional jack shown in FIG. The pile body a is positioned between the pile body a and the top of the pile body a, and by lowering the plunger of the jack 10, the pile body a is pressed into the ground using the weight of the structure as a reaction force.The operation is as follows. done in the same order.

(1) The entire device is moved to a desired location by the traveling mechanism 1 and stopped; (2) The telescoping column 5 is lowered in advance, and the telescoping arm 9 is manually rotated around the plunger 4 in a horizontal plane, and Position the jack 10 at a desired location on the bottom surface of the building foundation by expanding and contracting it with the hydraulic cylinder 7; (3) Adjust the degree of protrusion of the telescopic arm rod 9 using the rotary handle 12 to position the top surface of the jack 10 at the desired location on the bottom surface of the building foundation. and then the telescopic column 5
is raised by the hydraulic cylinder 3 until the upper surface of the jack 10 contacts the lower surface of the foundation. In this case, since the jack 10 is suspended by the springs 11, 11, the jack 10 and the lifting device will not be damaged even if the jack is raised a little too high.

(4) With the plunger of the jack 10 in the raised position, position the required pile body a (unit steel pipe) between the jack and the ground, then lower the plunger of the jack a little and position it on the top surface of the pile body a. After that, activate the jack 10 and press the pile body a into the ground using the weight of the structure as a reaction force; (5) Press the pile body a until the top remains slightly on the ground surface, and then press the jack 10. Raise the plunger, place the next pile body (unit steel pipe) on top of the above pile body, weld the periphery of the mounted part and connect it to the press-fitted steel pipe pile, and then
Activate the plunger 0 and press-fit the next pile body; (6) After repeating the steps (4) and (5) above in order to press-fit a large number of connected pile bodies to the required depth, move the traveling mechanism 1. The entire equipment is removed, fixed materials such as steel plates and concrete blocks are placed between the bottom of the structure's foundation and the top of the pile, and the excavated area is backfilled to complete the construction work.

As explained above, in the pile body press-fitting device of the present invention, the movement and positioning of the jack 10 is extremely easy due to the traveling mechanism 1, the telescoping column 5, and the rotatable telescoping arm 9, and the jack 10 is mounted on the left and right suspension springs. 11, 11 so that it can be freely and tilted in the vertical direction, it can be positioned to follow the slope of the lower surface of the structure's foundation, and when activated, the upper surface of the jack 10 is evenly pressed against the lower surface of the structure's foundation. can be retained. Furthermore, Jyatsuki 10
Since the operation of feeding the material to the lower surface of the construction foundation is performed mechanically by the extension and contraction and horizontal rotation of the telescopic arm rod 9, there are many advantages such as operational safety.

[Brief explanation of the drawing]

FIG. 1 is a side view of a pile body press-in device according to the present invention;
Fig. 2 is a front view, and Fig. 3 is an explanatory diagram of pile increase work using the conventional construction method. Codes in the figure: 1 is a traveling mechanism, 2 is an underframe, 5 is a telescopic support, 9 is a telescopic arm, 10 is a jack, 11 is a suspension spring, and a is a pile body.

Claims (1)

[Claims] 1 A telescopic support is provided on the underframe with a traveling mechanism,
A telescoping arm that can be extended and rotated is provided at the top of the telescoping column, and a jack is provided at the tip of the telescoping arm to bring one end into contact with the lower surface of the structure foundation and the other end into pressure contact with the top surface of the pile body. A pile body press-in device characterized in that it can be installed.