JPS62137318A - Covered sand pile driving work - Google Patents

Abstract

PURPOSE:To exactly control the length of sand piles driven by a method in which sand is supplied into the cylinder of a cassette to form covered sand piles in order, a given length of covered and piles are packed into a casing, and a next cassette is installed. CONSTITUTION:The penetration of a casing 5 into the ground is started, and at an adequate stage during the penetration process, a slide valve 10 is opened to send sand in a sand hopper 2 to the tip of a covering material 13 through the cylinder 12 of a cassette 11. The covering material 13 in the shrunk state is then expanded in order and lowered in the casing 5 while forming a covered sand pile P. At the stage of ending the penetration of the casing 5, the slide valve 10 is closed and the covering material 13 is cut off for exchanging work can thus be greatly raised and the safety of workers can be secured. The applicable length of the covering material can also be exactly matched with a given length of pile.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a construction method for driving covered sand piles (sand piles covered with a water-permeable and strong covering) into the ground.

- (Problems to be solved by the invention and its features) As a conventional example of the covered sand pile driving method, a long bag-shaped bag for many piles is installed on the outside of the cylindrical part at the outlet of the sand hopper located above the casing of the driving machine. The cassette is inserted into the ground in a contracted state and can be freely pulled out downward, and the casing is inserted into the ground with the cassette removably attached, and during this penetration process, sand is supplied to the cylindrical part of the cassette. In this method, the covered sand pile is filled into the casing while being formed sequentially.
It is known (see Japanese Patent Publication No. 58-59972).

This conventional example is superior in that it requires less manual work and has good construction efficiency compared to other conventional examples that use a coating wrapped in a roll (see Japanese Patent Publication No. 52-608). However, it has the following advantages: There is a problem. In other words, in this conventional example, a cassette with coverings for many piles is used, which inevitably requires a long cassette, which increases the height of the driving machine. In order to drive a coated sand pile of a predetermined length, the lower end of the sheath must reach the bottom of the casing and the sheath of the predetermined length should be pulled out from the cassette and stop moving downward. It is assumed that sand has entered the casing, and it is confirmed through the viewing window provided at the top of the casing that the sand has been filled to a predetermined depth (below the damper) within the casing, and at this point the sand supply is stopped. Although we have no choice but to cut the covering,
The descending of the covering does not necessarily stop only when the lower end of the covering reaches the bottom of the casing, and the descending of the covering may stop due to resistance in the middle of the casing, but this conventional example does not Since it is impossible to determine whether the sand pile length is as specified or not, there is uncertainty as to whether or not the sand pile length is as specified.

The present invention uses a cassette to which a covering for one pile is attached, and replaces it with a new cassette after each pile driving, thereby taking advantage of the advantages of the conventional example and solving its problems. The structural features are as described in the claims.

In terms of length, the length of one pile of the covering body in the present invention is the predetermined length α (α≧0) of the driven pile, and the length α is the predetermined length α of the cassette with the entire covering body stretched. When the sheathing is cut, the sheathing of a predetermined length will enter the casing by itself, and if a part of the sheathing remains in a contracted state and stops moving, a covered sand pile of the predetermined length can be driven. Since it is immediately clear what is not being done, the length of the sand pile to be driven can be managed reliably.

(Detailed Description of the Invention with Drawings) First, the covered sand pile driving machine for carrying out the present invention illustrated in FIGS. 1 to 3 will be explained. 1 is a penetrating machine, 2 is a sand hopper, and 3 is a cassette It is attached to the frame of the section, 4 is a box with a built-in air valve, and 5 is a casing, all of which are suspended by wires 6 to the main body of the construction machine (not shown) so as to be able to rise and fall freely.

At the outlet of the sand hopper 2, there is a slide valve 1 equipped with a valve plate 8 operated by a cylinder device 7 and a groove 9 for mounting a cassette.
0, and the cassette 11 is installed by fitting the flange at the upper end of the cylindrical portion [2 into the groove 9.

A cylindrical covering 13 for one pile is inserted into the outside of the cylindrical portion 12 of an unused cassette 11 in a contracted state. fixed, and the lower end of the covering 13 is closed by means such as binding, and
It can be pulled out downwards.

The length of the covering body 13 is approximately equal to the length of the driven pile.
When the covering 13 attached to the cassette 11, which is longer than the length tl by α (α≧O), is cut at a length α from the fixed point in the fully extended state, the covering 13 with the length tl is cut. It is designed to enter inside the casing 5.

A cover retainer 16 consisting of a fixed part 14 and a rotating part 15 is attached to the top of the box 4. It is attached by a spring 21 tensioned between the fixed pin 18 which is supported via the rotation shaft and located above the rotation axis, and the tip pin 20 of the arm piece 19 which rotates integrally with the rotation part 15. When pressed, it can be switched between a closed state that provides resistance to the covering 13 passing through the gap between the covering retainer 16 and the cylindrical portion 12, and an open state when replacing the cassette 11. .

The air valve 22 in the box 4 is equipped with a balance weight 23 (always biased in the closed direction), and the box 4
A pressurized air supply/discharge port 24 is provided in the casing 5.
The lower end portion 25 is formed to be thin over a considerable length, so that the covered sand pile body filled in the casing 5 can be smoothly removed. A valve 26 is provided.

Next, an embodiment of the present invention using the above-mentioned coated sand pile driving machine will be explained with reference to FIG. At an appropriate stage of the process, open the slide valve lO to feed the sand in the sand hopper 2 through the cylindrical portion 12i of 11 toward the tip of the covering 13, and sequentially expand the contracted covering 13 to form a covered sand pile. The inside of the casing 5 is lowered while forming a body P (
condition of the mouth).

At this time, considering the penetration of the casing 5 and the tamping of the growth of the covered sand pile body P, when the penetration of the casing 5 is completed, the covering body 13 is almost fully extended and the planned cutting position (leaving a length α It is preferable that the coated sand pile body P grows up to the position (position). At this point, the slide valve 10 is closed and the coated body 13 is cut, so that a predetermined length (kit) of coated sand is deposited in the casing 5. After filling the pile body P', the used cassette 11 is replaced with a new cassette 11' to be used in the next driving operation, and at the same time, the box 4 and casing 5 are Start supplying pressurized air inside (state C).

Next, while continuing to supply pressurized air, the casing 5 was started to be pulled out (state 2), and the casing 5 was completely pulled out to the ground while leaving the covered sand pile body P' in the ground (state E), and the casing 5 was pulled out once. Complete the pouring work.

(Effect of the invention) The present invention is as described above, and the only work at hand during construction is replacing the cassette and cutting the covering (this cutting of the covering is also done by setting the above-mentioned α to 0 and cutting the upper part of the covering. (can be omitted by temporarily fixing with tape, etc.)
It is expected that construction efficiency will be significantly improved and worker safety will be ensured.Furthermore, since a cassette with one pile's worth of sheathing installed is used, the usage length of the sheathing can be reliably adjusted to the specified pile length. Since it is possible to drive coated sand piles without any concerns in terms of quality control, it is possible to save the length of the cassette and, by extension, the length of the entire driving machine. Secondary effects can also be expected.

[Brief explanation of drawings]

Figure 1 is an overall view of the coated sand pile driving machine for implementing the present invention, Figure 2
The figure is an enlarged perspective view of the slide valve, FIG. 3 is an enlarged plan view of the cover retainer with a partially omitted part, and FIG. 4 is a process diagram for explaining the present invention. In the figure, 2... sand hopper, 5... casing, 11...
...Cassette, 13...Covering body, ...

Claims (1)

[Claims] At the outlet of the sand hopper located above the casing of the pouring machine, a cassette with a bag-shaped covering for one pile inserted into the outside of the cylindrical part in a contracted state and can be freely pulled out downwards is attached and detached. In the installed state, the casing is penetrated into the ground, and during this penetration process, sand is supplied to the cylindrical part of the cassette, and it is lowered while sequentially forming a covering sand pile body, and a predetermined length of covering is deposited inside the casing. A covered sand pile driving method characterized by filling a sand pile body and attaching a cassette to be used in the next driving process before pulling out the casing that has penetrated to a predetermined depth.