JP2012197657A - Pile press-in device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which enables a bearing pile to be newly installed in a quick and easy manner.SOLUTION: The device comprises a carriage 1 with wheels 13, a jack frame 2 installed in the uppermost part of the carriage 1, a press-in jack 21 installed in the jack frame 2 and expanded and contracted in the vertical direction, a frame lifting screw 15 for moving the jack frame 2 in the vertical direction, and a fixing screw 16 for fixing the position of the carriage 1.

Description

  The present invention relates to a pile press-fitting device.

  Various methods are used to underpeen existing buildings, repair settlements, or build support piles. An example is shown in FIG.

JP 2006-328716 A JP 2009-203672 A Japanese Patent Laid-Open No. 7-3784

The conventional pile press-in device described above has the following problems.
<1> Both methods employ a method of excavating a vertical hole deeper than the foundation, attaching a jack to the foundation inside the hole, and press-fitting the steel pipe into the ground with the jack as a reaction force.
<2> Therefore, it is necessary to perform jack installation work and jack removal work after press-fitting in each vertical hole, which requires a lot of time and labor.
<3> In addition, a dangerous work is required to lift a heavy jack and attach it to the foundation from below.
<4> For each position where it is press-fitted with a jack, it is necessary to assemble a scaffold to the lower surface of the foundation and disassemble and transport the scaffold after press-fitting.

  The pile press-fitting device of the present invention that solves the above-described problems includes a wheeled carriage, a jack stand installed at the top of the carriage, a press-fit jack that is installed on the jack stand, and expands and contracts in the vertical direction, and a jack. It is characterized by comprising a gantry vertical movement screw that moves the gantry in the vertical direction and a fixed screw that fixes the position of the trolley.

The present invention improves the conventional problems as described above, and can achieve the following effects.
<1> It is easy to install and remove a jack that takes a reaction force from the lower surface of the foundation, and a large number of steel pipes can be press-fitted continuously and efficiently.
<2> Since a heavy jack can be carried on a pedestal and mounted on the lower surface of the foundation as it is, dangerous work by workers is unnecessary.
<3> As in the prior art, it is not necessary to assemble a scaffold for each press-fitting position, dismantle the scaffold after press-fitting, and transport it to the next press-fitting place, and work can be performed very quickly.

Explanatory drawing of the Example of the press-fit apparatus of the pile of this invention Illustration of the construction status of the underground work space Explanatory drawing during movement of press-fitting device Explanatory drawing with the device fixed Explanatory drawing of the state to take in the new steel pipe Explanatory drawing of the state where the new steel pipe is press-fitted Explanatory drawing of conventional press-fitting method

  Hereinafter, preferred embodiments of a press-fitting device of the present invention will be described in detail with reference to the drawings.

<1> Cart with Wheels The press-fitting device A according to the present invention is based on a carriage 1 assembled between a steel column 11 erected in four directions with ceiling beams 12 and assembled into a rectangle, and a jack base 2 mounted on the carriage 1. Constitute.
Wheels 13 are attached to the lower part of the carriage 1 so as to be movable.
If a part of the dolly 1 floor beam 14 is cut, the steel pipe P to be press-fitted can be suspended from the cut portion.
It is sufficient for the cart 1 to be strong enough to carry the jack mount 2, and no external force is applied to the cart 1 itself when the steel pipe P is pressed by the jack 21.
Therefore, the cart 1 does not need to have a particularly strong structure, can be assembled with a simple steel material, is lightweight, and can be moved by human power.

<2> Jack mount 2 A jack mount 2 is mounted on the top of the carriage 1.
The jack mount 2 is configured such that a jack mounting plate 22 and a lifting plate 23, which are two plates, are arranged in parallel, and are connected by a vertical bolt 24.
And it installs in the state which pinches | interposes the ceiling beam 12 of the upper part of the support | pillar 11 of the trolley | bogie 1 with both boards.
The jack mounting plate 22 is a plate for holding the jack 21 in a posture in which the jack 21 can extend and contract in the vertical direction, and only the cylinder 21 a of the jack 21 enters and exits from a through hole opened in the mounting plate 22.
One or more jacks 21 may be provided.
The lifting plate 23 positioned parallel to the mounting plate 22 across the ceiling beam 12 is a horizontal plate positioned at the upper end of the jack 21.
Since there is a margin in the fixing position of the vertical bolt 24, it can be raised toward the lower surface of the foundation slab C of the building or the underground beam B as the jack 21 extends.
An elastic mat 23a such as a rubber plate is attached to the upper surface of the elevating plate 23 so that some unevenness on the lower surface of the underground beam B can be absorbed.
Since the jack mount 2 is attached to the uppermost ceiling beam 12 of the carriage 1, if the ceiling beam 12 is raised and lowered, the entire jack mount 2 can be raised and lowered, and the lower plate 23 and the lower surface of the underground beam B The distance can be adjusted.
For this purpose, an elevating screw 15 is attached to the upper end of each column 11, the ceiling beam 12 is supported by the screw 15, and the ceiling beam 12 is raised and lowered by its rotation.

<3> Fixed screw A fixed screw 16 that can be expanded and contracted in the vertical direction is attached on the ceiling beam 12, and a support plate 17 is attached to the upper end thereof.
If the support plate 17 is pressed against the lower surface of the foundation slab C or the underground beam B by the extension of the fixing screw 16, the position of the entire carriage 1 can be fixed.

<4> Usage Method Next, a usage method of the press-fitting device A of the present invention will be described.

<5> Construction of underground space (Figure 2)
The underground beam B of the existing large building is supported by the foundation pile E that has already been placed in the ground.
The press-fitting device A of the present invention is a device used when reinforcing a foundation pile E by press-fitting a new pile P around the foundation pile E when there is a problem with the strength of such foundation pile E. is there.
For this purpose, the base slab C of the building and the lower surface of the underground beam B are excavated widely to construct an underground space D, which is used as a work area for reinforcement work.
Therefore, the underground space D is a wide space in which only the plurality of foundation piles E are forested between the ceiling surface and the floor surface of the excavated space, with the lower surface of the foundation slab C and the underground beam B as the ceiling surface. It becomes a space like a gymnasium.

<6> Movement of press-fitting device (FIG. 3)
The operator presses the press-fitting device A of the present invention or pulls it with a simple device to move the work floor and position the new pile P at the press-fitting position.
As described above, since the press-fitting device A itself is not a structure that takes the reaction force when the pile P is press-fitted, it can be configured with a simple skeleton and can be moved by human power because it is lightweight.
At the time of movement, the jack 21 is shortened and the elevating plate 23 is lowered to make a certain distance from the lower surface of the foundation slab C and the underground beam B.

<7> Positioning of the device (Fig. 4)
When arriving at the press-fit position of the new pile P, the fixing screw 16 that expands and contracts in the vertical direction is extended at the top of the support pillar 11, and the support plate 17 at the tip thereof is grounded from the ground beam B and the foundation slab C. Press against the lower surface of the intermediate beam B.
Then, the wheel 13 and the support plate 17 prevent the carriage 1 from freely moving.

<8> Push-up of lifting plate Next, the lifting screw 15 is extended to push up the entire jack rack 2, and the upper surface of the lifting plate 23 is pressed against the lower surface of the underground beam B.
Since the elastic mat 23a is positioned on the upper surface of the elevating plate 23, even if there is some unevenness on the lower surface of the underground beam B, it can be absorbed.
When pushing up, it is not necessary to push up in a pressurized state, and it is sufficient that the elastic mat 23a is simply in contact with the lower surface of the underground beam B.

<9> Incorporation of newly installed steel pipe (Fig. 5)
The steel pipe which comprises the newly installed pile P is taken in into the inside of the trolley | bogie 1, ie, just under the jack 21. FIG.
This uptake can be performed by human power or by a method of attaching a simple gripping tool to the tip of the forklift.
If a part of the floor beam 14 on the lower side of the carriage 1 is cut, it is easy to take in from the interval.
The steel pipe that is the new pile P to be taken in has a length slightly shorter than the interval between the work floor surfaces from the cylinder lower surface of the jack 21 in a shortened state.

<10> Press fitting of steel pipe (Fig. 6)
In this state, the press-fit jack 21 is extended.
Then, the cylinder 21 a portion of the press-fit jack 21 is exposed downward from the through hole of the jack mounting plate 22 of the jack mount 2.
By extension of the jack 21, the steel pipe as the new pile P can be gradually pressed into the ground.
At that time, since the upper surface of the lifting plate 23 located on the jack mount 2 is in contact with the underground beam B, the reaction force of the newly installed pile P press-in can be taken from the underground beam B, There is no force for press-fitting.

<11> Connection of steel pipes Since the extension length of the jack 21 is shorter than the length of one steel pipe P, a plurality of, for example, single cylindrical spacers are interposed between the upper part of the steel pipe P and the cylinder lower surface of the jack 21. And pressurize the spacers in sequence.
When the length of one steel pipe P is press-fitted, the spacer is removed, the lower end of the next steel pipe P is welded to the upper end of the press-fitted steel pipe P, and the same operation as described above is repeated.
Such a method of press-fitting with a spacer interposed is known.

<12> Movement of device When the press-fitting at a predetermined position is finished, the jack 21 is shortened, the lifting plate 23 is moved away from the lower surface of the underground beam B, and the carriage 1 is moved to the next press-fitting position.
In this way, there is no need to install or dismantle the scaffolding or attach or remove the jack 21 at the start or end of the work at one place, so that the work can be continued very efficiently. it can.

A: Press-fit device B: Underground beam C: Foundation pile D: Underground space P: Newly built pile (steel pipe)
1: Cart 11: Post 12: Ceiling beam 13: Floor beam 2: Jack stand 21: Press-fit jack 22: Jack mounting plate 23: Lift plate

Claims (2)

A wheeled carriage,
A jack stand installed at the top of the carriage,
A press-fit jack that is installed on the jack stand and expands and contracts in the vertical direction; a stand vertical movement screw that moves the jack stand up and down;
It is composed of a fixed screw that fixes the position of the carriage,
Pile press-fitting device. The jack mount is
While sandwiching the ceiling beam at the top of the support pillar,
A jack mounting plate located above the ceiling beam;
It consists of a lift plate located under the ceiling beam,
Connected with vertical bolts,
The jack mounting plate is a plate body in which only the cylinder of the jack goes in and out from the through hole opened in the mounting plate.
The pile press-fitting device according to claim 1.

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