JPH11323931A - Pile hanging-in jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sink a pile without using a special material by obviating arranging work of chemical supply piping at building-up work time of a ready-made pile. SOLUTION: A pile hanging-in jig is composed of a pile cap main body 2 freely connected by being fitted to the upper end of a ready-made pile P and a holder 3 arranged in this pile cap main body so as to be freely slidable in the vertical direction and capable of being liquid-tightly press-fitted to the upper end surface of the ready-made pile. The pile cap main body 2 has a connecting rod 4 connectable to the auger driving part on the upper end and having a liquid supply passage in the shaft direction, and a holder 3 has a vertical passage communicating with the liquid supply passage of the connecting rod, and has a distributing passage 14 containing a circumferentially long hole communicating with a flowing passage 15 vertically arranged in the ready-made pile P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for suspending a pile used in a method of laying a pile.

[0002]

2. Description of the Related Art As a conventional technique of a method of building a ready-made pile in the ground, there is an inflatable bag at a lower end in a pit previously dug into the ground by an earth auger, and cement milk is added to a thick portion of the above bag. A hollow pile having a flow passage for supplying a chemical solution such as a pile is built so that a pile head is buried at a predetermined depth from the surface of the ground, and then a chemical solution such as cement milk is supplied to the bag body to expand the ground. Some are designed to create enlarged bulbs.

[0003]

However, in the above prior art, a pipe for supplying a chemical solution is installed at the head of the pile, and the chemical solution is supplied from the ground to the inflatable bag at the lower end of the pile. Not only is the installation work on site troublesome, but also
When the pile is settled to an appropriate depth from the ground surface, the pipe is in the way and cannot be settled using a pile hanging jig commonly called `` Yatko '', and using unrecoverable wires etc. I had no choice but to work.

[0004]

SUMMARY OF THE INVENTION The present invention eliminates the necessity of installing a chemical supply pipe at the time of building a ready-made pile, and enables the pile to be laid without using any special material. The task was to make

[0005] As means for solving the above problems, the present invention provides:
A pile cap body which is fitted to and connected to the upper end of the ready-made stake at the upper end of the ready-made stake, and which is provided slidably in the vertical direction within the pile cap body and can be liquid-tightly crimped to the upper end surface of the ready-made stake The pile cap body has a connecting rod at the upper end thereof, which can be connected to an auger driving unit and has a liquid supply path in the axial direction, and the holder has a vertical passage communicating with the liquid supply path of the connecting rod. And a distribution path including a circumferentially long hole communicating with the flow path vertically provided on the ready-made pile.

In general, hollow piles are often used as the ready-made piles, and in this case, the flow passage is formed in a thick portion of the hollow pile.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a front view of an embodiment of a pile hanging jig according to the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a longitudinal section of FIG. 1, and FIG. A considerable cross section is shown.

The above-mentioned pile suspending jig 1 has a cylindrical pile cap body 2 having a downwardly U-shaped cross section which can be fitted and connected to the upper end of a ready-made pile P, and is provided inside the pile cap body 2. The holder 3 is provided so as to be slidable up and down and can be press-bonded to the upper end of the ready-made pile P in a liquid-tight manner.

At the center of the upper surface 2a of the pile cap body 2, there is provided a connecting section having a polygonal cross section for connecting to an auger driving section 25 of an excavator shown in FIG. A rod 4 is protruded, and a liquid supply path 5 is formed at the axis of the connecting rod 4 so as to communicate with a liquid supply path from a liquid supply source such as cement milk through the drive unit and the rod. At the same time, concave grooves 6, 6 for connection with the rod 26 are formed in the outer peripheral portion.

At the inner end position of the connecting rod 4, a cylindrical guide tube 7 is fixedly suspended. Further, a required number of window holes 8 for removing mud are formed in the peripheral wall portion 2b of the pile cap body 2 at a position corresponding to the lower end position of the guide cylinder 7.

A cut-out 9 whose lower end is open and whose upper end is bent in the horizontal direction is formed at least at two places on the diameter line at the lower end of the peripheral wall portion 2b of the pile cap body 2, and is bent in the horizontal direction. A protruding portion 9b is protruded from the entrance end of the lower edge of the bent portion 9a.

On the other hand, on the outer periphery near the upper end of the ready-made pile P, a latch 10 is provided so as to correspond to the notch 9.
The latch 10 can pass through the notch 9, and a vertical deep end 9 c of a bent portion 9 a of the notch 9 and the protrusion 9
b. In addition, the notch 9 and the latch 10 may be provided at three or four equiangular positions according to the diameter of the ready-made pile P.

The holder 3 has a hollow disk shape, and has a cylindrical slide which is slidably fitted to the outer periphery of the guide cylinder 7 of the pile cap body 2 via a sealing material 11 at the center of the upper surface. The moving part 12 is vertically projected, and forms a vertical passage inside each of the guide cylinder 7 and the sliding part 12, and the lower end thereof is communicated with the distribution path 14 inside the holder 3 through the through hole 13.

On the lower plate 3a of the holder 3, a ready-made pile P
A plurality of elongate holes 16 which are long in the circumferential direction and are communicated with the flow passages 15 which are vertically provided in the thick portion of the vehicle. This long hole 16
4 constitutes a part of the distribution path 14, and the distribution path 14 and the flow path 15 communicate with each other even if the pile cap main body 2 is fitted at an arbitrary position without positioning the pile cap body 2 with the ready-made pile P. As shown in FIG.

A plurality of (three in the figure) mud removal pipes 17, 17, 17 penetrating up and down the holder 3 are attached by reinforcing ribs 18, 18, 18, and are connected to the hollow portion of the prefabricated pile P. The mud discharge holes 8, 8 of the pile cap body 2 communicate with each other.

At the upper part of the holder 3 at a position corresponding to the mud discharge holes 8, 8,..., Stoppers 19 are provided so as to reach the inside of the mud discharge holes 8, 8,.
Abuts on the upper end or lower end of the mud discharge hole 8, whereby the vertical stroke of the holder 3 is regulated.

A coil spring 20 is fitted between the upper surface of the holder 3 and the lower surface of the upper surface portion 2a of the pile cap body 2 so as to fit over the outer periphery of the guide tube 12. The holder 3 is always urged downward by the force, and the packing material 21 made of an elastic material such as an annular rubber attached to the lower surface of the holder 3 is constantly liquid-tightly pressed against the upper end surface of the pre-made pile P. It is configured to be closed. The packing material 21 is also provided with a long hole 22 that matches the long hole 16 on the lower surface of the holder 3. In FIG. 3, reference numeral 23 denotes a ring-shaped protection member for pressing the inner periphery of the packing material 21.

An inflatable bag 24 (shown in FIG. 5) is provided at the lower end of the ready-made stake P as in the prior art, and the inside of the bag 24 and the lower end of the flow passage 15 are in communication with each other.

Next, the operation of the above embodiment will be described with reference to FIGS.
This will be described with reference to FIG. Note that in FIG.
Denotes an auger drive unit of the excavator, 26 denotes the above-mentioned rod connected to an output shaft of the drive unit 25, and 27 denotes a chemical liquid supply pipe such as cement milk. Reference numeral 28 denotes a pit excavated in the ground, and reference numeral 29 denotes a large-diameter bulb forming portion which has been dug in advance at the lower end of the pit 28.

First, a pit 2 excavated by an earth auger
8, a hollow ready-made stake P is suspended and inserted by a wire or the like, and is protruded above the ground by a height which facilitates the work (FIG. 5).
(A)). At this time, the lower end of the ready-made pile P has not reached the bulb forming part 29 at the lower end of the vertical hole 28.

In this state, the connecting rod 4 of the pile cap body 2 is connected to the lower end of the rod 26 connected to the drive unit 25 of the excavator, and the center of the pile cap body 2 and the center of the ready-made pile P are substantially equal. Position so that they match (Fig. 5
(B)).

Next, the drive unit 25 is lowered, and the pile cap body 2 is put on the upper end of the ready-made pile P. At this time, the driving unit 25 is slightly driven so that the notch 9 of the pile cap body 2 and the locking metal fitting 10 coincide with each other, and the positioning is performed.

After that, the drive unit 25 is lowered, and when the notch portion 9 is fitted to the lock member 10, the drive unit 25 is further rotated slightly so that the lock member 10 enters the bent portion 9 a of the notch portion 9. When the pile cap body 2 is slightly pulled up in such a manner, the locking fitting 10 engages with the projection 9b (FIG. 5).
(C)).

In this state, the wire suspending the ready-made stake P is removed, and the weight of the ready-made stake P is deposited in the pile suspending jig 1.

At the same time, the packing 21 on the lower surface of the holder 3 in the pile cap body 2 is
And the liquid-tight state between them is maintained.

In this way, the drive unit 25 is lowered (FIG. 5
(D)), the ready-made pile P is lowered to a predetermined depth (FIG. 5).
(E)).

Next, when a chemical supply pump (not shown) is started, the chemical is supplied from an external chemical supply source through a chemical supply pipe 27 to the drive unit 25, the rod 26, the connecting rod 4, the guide cylinder 7, and the sliding unit 12. Through the distribution path 14 of the holder 3
Into the inflatable bag 24 through the flow path 15 of the ready-made stake P through the slots 16 and 21.
4 gradually expands (FIG. 5 (F)), and the bag 24
As shown in (G), the injection of the drug solution is stopped when it has completely expanded.

When the injection of the chemical solution is completed, the driving portion 25 is slightly lowered to remove the projection 9b from the locking metal fitting 10, and then, is rotated slightly in the opposite direction to the above, so that the locking metal fitting 10 is cut out.
Then, the drive unit 25 is lifted up, and the pile hanging jig 1 is pulled upward and collected (FIG. 5 (H)).

[0029]

As described above, according to the present invention, even a prefabricated pile having an inflatable bag at the lower end can be reliably lowered (set) to a predetermined depth in a vertical hole, and at the same time, an inflatable bag can be formed. The liquid can be supplied to the body to expand it. The same applies to the case of a ready-made pile having no inflatable bag.

Further, the jig according to the present invention can be easily recovered after a predetermined operation is completed, so that the jig can be used repeatedly, which is very economical. Further, since separate piping work for the chemical liquid supply pipe is not required, workability is good, and since there is no external piping, when the pile cannot be settled, it is possible to rotate and settle.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a pile hanging jig according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a longitudinal sectional view of FIG.

FIG. 4 is a sectional view corresponding to AA in FIG. 3;

FIGS. 5A to 5H are explanatory views showing examples of working steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Jig for pile suspension 2 Pile cap main body 3 Holder 4 Connecting rod 7 Guide cylinder 8 Mud elimination window hole 9 Notch 10 Lock metal 12 Sliding part 14 Distribution path 15 Flow path 16 Long hole 17 Mud removal pipe Reference Signs List 18 rib 19 stopper 20 spring 21 packing material 22 long hole 24 bag 25 drive unit 26 rod

Claims (1)

[Claims] 1. A pile cap body which is fitted to and connected to the upper end of a ready-made stake, and is vertically slidable in the pile cap body and can be liquid-tightly crimped to the upper end face of the ready-made stake. The pile cap body has a connecting rod at an upper end thereof that can be connected to an auger driving unit and has a liquid supply path in an axial direction, and the holder has a vertical passage communicating with the liquid supply path of the connection rod. And a distribution passage including a circumferentially long hole communicating with a flow passage vertically provided in the ready-made pile.