JPH01304217A - Jack method of pile and jack device thereof - Google Patents

Abstract

PURPOSE:To prevent non-uniform settlement of a foundation by enabling the bending of the upper part of a guide frame against the lower part thereof, providing a jack to the upper part and a structure foundation engagement board to the lower part, inserting a pile into the frame and force fitting the pile into the ground, provided the foundation is reaction force. CONSTITUTION:A pile jack device (A) is basically constituted of a lower guide frame 2 and an upper guide frame 1 pivoted by the upper end of the lower guide frame 2 so that it is capable of bending. The upper guide frame 1 is such that guide boards 3 are arranged in opposite directions and that a pile (m) is inserted between both guide boards 3. A jack 5 is provided to the upper part of the upper guide frame 1, and the pile (m) is pushed downward. The lower guide frame 2 has a stopping board 7 interlocking with a foundation of a structure on a lower back side, but at the same time, it is so formed that the pile (m) can be passed through. According to the constitution, the pile can be force fitted from a hole excavated in the vicinity of the structure, provided the foundation is reaction force.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is intended to solve the problem of structural subsidence that occurs over the years after construction in relatively heavy buildings such as reinforced concrete structures. Or, in order to cope with the uneven settlement of various structures due to ground subsidence, which has been occurring frequently recently, to reinforce the structure, and to correct the uneven settlement, to stop the subsidence itself, or to prevent the occurrence of subsidence, the foundation is installed. The present invention relates to a method and a press-in device for press-fitting a pile directly under a pile.

(Prior art) In relatively heavy buildings such as those made of reinforced concrete, the so-called subsidence phenomenon occurs in which the building sinks unevenly due to soft ground, hill construction, etc. after several years have passed since construction. This phenomenon of subsidence can cause inconveniences such as lowering the first floor of a building below the ground level of roads, etc., and in cases of uneven subsidence, etc. This results in distortion of the building itself, making it difficult to erect fittings, etc.

Therefore, in order to maintain the complete and safe use of such buildings, if subsidence has already occurred, it is necessary to stop the progress of subsidence and to reinforce the structure or correct the subsidence. Even if subsidence has not yet occurred, if there is a concern that subsidence may occur in the future, it is preferable to take measures to prevent subsidence in advance.

Conventionally, as shown in Fig. 10, as a method for reinforcing such buildings, preventing settlement, and correcting settlement, a pile m' is driven directly under the foundation n' and the core grain m' directly receives the foundation n'. There is a particle method.

This is done by digging a pile hole H' as a work space directly under the foundation n' part, and installing a hydraulic jack 5' in reverse on the lower surface of the foundation n' exposed by the pile hole H'. Using the weight of the building, install the hydraulic jack 5' in reverse, and using the weight of the building, use the hydraulic jack 5' to install a pile m' with a length of approximately 1 m.
The steel pipes are press-fitted into the ground, and steel pipes are welded using electric welding to connect them one after another to create a pellet with the desired length and yield strength.

(Problem to be solved by the invention) However, this method requires a working space of about 2 m in terms of the length of the pile and the length of the jack. In addition to requiring labor, a temporary cradle is required to support the structure, and installing the temporary cradle requires time and expense, and it also requires a person to enter the narrow pile interior and operate the high-pressure hydraulic shirt A. Pile welding involves press-fitting fine particles, which poses many problems in terms of safety, workability, economy, etc.

The present invention was made in view of the above problems, and
The purpose of this is to allow construction work to be carried out by excavating relatively small pile holes that do not require workers to enter, and because the amount of excavation is not very large, there is no need to set up temporary supports, and the work can be done by operating high-pressure jacks and welding the piles. It is an object of the present invention to provide a method for press-fitting piles that does not require press-fitting fine grains into pile holes, and is excellent in safety, economy, workability, etc., and an apparatus therefor.

(Means for Achieving the Object) The means of the present invention for achieving the above-mentioned object is, firstly, by excavating and forming a pile hole of an appropriate size in the ground at the lower side of the foundation of a building; A press-fitting device is formed such that an upper guide frame with a jack in the hole and a lower guide frame with a foundation locking plate protruding therefrom can be bent at the connecting portion, and the foundation locking plate locks onto the lower surface of the foundation. The upper guide frame is fixed upright along the side of the building so that it is fixed, and a pile is installed in the press-in device and pressed into the ground by the jack, and with the head of the core grain located in the connection part. A method for press-fitting a pile, characterized in that the pile is supported by the foundation by bending the core and connecting another pile to the head of the core, and partially restoring the guide frame and press-fitting the core again. and secondly, an upper guide frame formed by disposing guide plates facing each other on a lower guide frame having a foundation locking plate protruding from the lower rear side is provided in a bendable manner; The pile press-fitting device is characterized in that an inverted jack is provided on the upper guide frame so as to be movable up and down.

(Function) According to the above configuration, the lower end of the press-fitting device is inserted into the pile hole drilled and formed at the lower side of the foundation of the building, and the foundation locking plate is locked to the bottom of the side of the foundation. Place the press-fitting device so that it fits.

When the head of the pile built in the upper guide frame is pressed by the jack, the foundation locking plate is pressed against the bottom of the foundation, and the reaction force presses the pile into the ground, causing the head of the pile to be pressed into the ground. - When the L part guide frame is located at the top of the lower guide frame, the L section guide frame is lowered forward and another pile is welded and connected to the head of the core grain, and the upper guide frame returns and the core grain is is forced into the ground again by jacks.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows a pile press-in device A of the present invention,
It is composed of an upper guide frame 1 and a lower guide frame 2.

The upper guide frame 1 has a gate-shaped structure in which elongated steel guide plates 3 are connected oppositely to each other by a top plate 4 at the upper end. installed in condition.

The jacks 5 are hydraulic, pneumatic, etc., and the adjustment fittings 3 are installed in mounting holes 3a provided above and below the guide plate 3.
It is attached so that it can be moved up and down with b.

The mounting height is adjusted by the adjustment fitting 3b.

At the lower part of the upper guide frame 1, mounting pins 6,6' are provided inside the lower guide frame 2 or the guide plate 3.

The mounting pins 6 and 6' are provided at the front and rear of the double force plate 3, and the rear mounting pin 6' is removably provided, so that the upper guide frame 1 can be moved forward with the front mounting pin 6 as the center. It rotates and falls down.

The lower guide frame 2 has a U-shaped plan view and has a foundation locking plate 7 protruding from the lower part of the back surface.

The foundation locking plate 7 is locked to the bottom of the foundation to support the pile press-in device A in an upright manner, and includes a reinforcing plate 7a protruding parallel to both sides of the back surface of the guide plate 3 and the reinforcing plate 7a. It is formed by a base plate 7b attached over the upper surface of the base plate 7b.

Next, a method for constructing a press-in pile m using the core grain press-in device A will be explained.

First, a pile hole H of an appropriate size is drilled at the pile installation location under the building B.

This pile hole 1 only needs to be large enough and deep enough for the tip of the press-fitting device A of the pile m to be inserted therein, and that the foundation locking plate 7 can be locked to the bottom of the foundation, and should be close enough to press-fit the pile m. Excavate from the ground surface to expose the bottom of the foundation n, and excavate a horizontal hole in the shape of a +/- tunnel to the extent that the foundation locking plate 7 can be inserted therein.

Then, the lower guide frame 2 is inserted into the pile hole I4, and the foundation locking plate 7 is locked to the bottom surface of the foundation n, so that the pile press-in device A stands up along the foundation n of the building. attachment,
The press-fitting device A is supported and fixed by support members fixed to the ground and the wall of the building.

Next, the steel pipe pile m is inserted into the press-fitting device A, and the jack 5 is operated to press the head of the steel pipe pile m downward.

The foundation locking plate 7 is pressed against the bottom surface of the foundation by the pressing force of the jack 5, and the steel pipe pile m is press-fitted into the ground by the reaction force. When the core grain m is press-fitted into the ground and its head is located near the upper end of the lower guide frame 2, the rear mounting pin 6' is removed and the upper guide frame 1 is rotated forward around the front mounting pin 6. The steel pipe pile M is moved and laid down, and another steel pipe pile M is placed on top of the head of the steel pipe pile M and connected by electric welding. This steel pipe pile m
After connecting the parts, the upper part 1 to the frame 1 are rotated rearward to stand up, and fixed with rear mounting pins 6'.

Then, the steel pipe pile m is again press-fitted into the ground by the jack 5, and by repeating this series of operations, it is press-fitted to a specified depth and a predetermined supporting force is maintained.

Next, a bracket m1 is attached to the pile head of the steel pipe pile m, and a correction jack 5a is installed on the flake J-m2, and a specified load is applied to it to correct the horizontal position.

After this horizontal correction, the correction jack 5a is removed and the main pedestal is installed to receive the building.

Next, a temporary frame is created by arranging and reinforcing reinforcing bars on the pile head, and filling concrete is poured into the frame to fix it, and the pile hole H
The land will be leveled by backfilling with earth and sand.

(Effects of the Invention) The present invention has the following effects by having the above configuration.

■ It is formed by an upper guide frame equipped with a jack that is an inverted version of the pile press-in device, and a lower guide frame equipped with a foundation locking plate, and the upper guide frame is rotated forward by the upper part of the lower guide frame. By moving and forming the foundation so that it can rise and fall freely, piles can be press-fitted without having to dig deep under the foundation of the building, which reduces labor and shortens the construction period. It is possible to improve both gender and economic efficiency.

■ A pile hole of an appropriate size is excavated in the ground at the bottom of the side of the foundation of a building, and an upper guide frame with jacks and a foundation locking plate are protruded into the pile hole to form a lower frame. A press-fitting device formed to be bendable at the connecting portion is fixed upright along the side of the building so as to be locked to the foundation locking plate or the lower surface of the foundation, and a pile is erected in the press-fitting device. The piles are connected by pressing into the ground with the jack, bending the upper guide frame while the head of the core grain is located at the connecting part, and connecting another pile to the head of the core grain. Since it can be carried out above ground, it is possible to eliminate the harmful effects associated with conventional welding work inside pile holes, and it is possible to improve safety.

[Brief explanation of the drawing]

Fig. 1 is a front view showing how the pile press-in device of the present invention is used, Fig. 2 is a side view of the same, Fig. 3 is a perspective view, and Figs. 4 to 7 show piles using the pile press-in device. Operation diagram of the horizontal construction method, No. 8
The figure is a sectional view showing a conventional example. A: Pile press-in device B: Building H: Pile hole m: Pile n, foundation 1: Upper guide frame 2, lower guide frame 3, Guide plate 5: Shackle 7, Foundation locking plate procedure amendment book 1988 September 6th

Claims (2)

[Claims] (1) A pile hole of an appropriate size is excavated in the ground at the lower side of the foundation of a building, and an upper guide frame with a jack and a lower guide frame with a foundation locking plate protruding into the pile hole. A press-fitting device, which is formed to be bendable at the connecting portion, is fixed upright along the side of the building so that the foundation locking plate is locked to the lower surface of the foundation, and a pile is erected in the press-fitting device. Press the pile into the ground with the jack, bend the upper guide frame with the head of the pile located at the connecting part, connect another pile to the head of the pile, and return the upper guide frame. A method for press-fitting piles, characterized in that the foundation is supported by press-fitting the piles again. (2) A lower guide frame with a foundation locking plate protruding from the lower back side is provided with an upper guide frame formed by opposing guide plates, and the upper guide frame is provided with a bendable upper guide frame. A pile press-fitting device characterized in that a jack in an upside down state is provided so as to be movable up and down.