JPH0639778B2 - Grout method and its equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grouting method and an apparatus therefor, and more particularly to a grouting method and an apparatus for improving grouting accuracy and work efficiency.

[Background of the Invention]

The grout method is used to inject a grout of cement paste or the like into cracks in dams or foundation grounds, and to block the cracks to improve the ground. In the conventional grout method, first, a digging pipe was used to dig up to the part where water blocking measures were required, then the digging pipe was pulled out, and after pulling out, a packer was inserted from the ground and the bulging part at the tip of the packer was bulged Grout such as cement is press-fitted from the rear ground, and the cracks are grouting to prevent water impermeable and improve the ground. However, in such a grout method, the digging pipe has to be temporarily pulled up to the ground every time the grout work is performed, the grout work efficiency is significantly lowered, and the work is remarkably difficult in the water-blocking measure in the deep part. There is a problem that makes it difficult.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and proposes a grout method and an apparatus thereof that can improve the work efficiency of grout, and can easily and accurately perform measures to prevent water impermeable and ground improvement in deep parts. Has an aim.

[Outline of Invention]

In the grout method according to the present invention, a drill pipe provided with a bit at the tip is rotated to excavate a cracked portion where water blocking measures are required, and then the drill pipe is pulled up by a predetermined amount to form a drill hole below the drill pipe. The core sampling pipe built into the drill pipe is taken out from the drill pipe, the packer device is inserted into the drill pipe in the state where the drill pipe is pulled up by a predetermined amount, and the bulging part of the packer device is inserted into the drill pipe tip. Fixed to the packer device by supplying a fluid to the bulging part, bulging the bulging part and closely contacting the hole wall of the excavation hole over the entire circumference, and at the grout outlet part of the packer device. It is characterized in that grout is supplied and grout is injected from the grout outlet to the crack.

Further, the grout device according to the present invention is provided with a bit at a tip portion thereof, a drill pipe into which a core sampling pipe can be inserted and mounted, a fluid passage and a grout passage which are inserted into the drill pipe, The portion is provided with a bulging portion that is bulged by the fluid supplied from the fluid passage and is in close contact with the hole wall, and an outlet portion of the grout supplied from the grout passage is formed below the bulging portion. And a packed packer device.

Example of Invention

Hereinafter, preferred embodiments of the grout method and the apparatus therefor according to the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 to 4, 6 and 7 show the work sequence of the grout method according to the present invention, and FIG. 5 shows the detailed structure of the packer device used in the grout method according to the present invention. Is shown. First, as shown in FIG. 1, a frame 10 erected on the ground holds a digging pipe 14 via a chuck 12 and a holder 13. The rotational force of the rotary drive source 16 is transmitted to the excavation pipe 14 so that the excavation pipe 14 is rotated. A bit 18 is formed at the lower end of the drill pipe 14, and a core sampling pipe 20 is built in the tip portion 14A of the drill pipe 14. The digging pipe 14 is formed to have a constant length, and is used as an extension as the digging pipe 14 is excavated.

A shoulder portion 22 for preventing the core sampling pipe from coming off is formed in the tip portion 14A of the drill pipe 14, and this shoulder portion 22 is the core sampling pipe 20.
The core sampling pipe 20 is locked in the tip portion 14A of the digging pipe 14 via the latch mechanism (not shown). When the drill pipe 14 is rotated and the supply pressure is applied in such a state, the rock core excavated by the bit 18 becomes the core sampling pipe 20.
Will be collected in.

After excavating a predetermined length by the excavation pipe 14, as shown in FIG. 2, the pulling-up tool 26 suspended by the wire 24 is engaged with the upper portion of the core sampling pipe 20. When the lifting device 26 engages within the core sampling tube 20, the shoulder 22 within the core sampling tube 20
The latch (not shown) that has been engaged with contracts, and contracts to release the engagement relationship with the shoulder portion 22. When the wire 24 is pulled up in such a state, the core sampling pipe 20 pulls up the core 20 to the ground side and collects it while the core is filled inside. When this operation is repeated to excavate up to the crack portion 27 that requires measures for water shielding and ground improvement, the excavation pipe 14 is slightly pulled up as shown in FIG. After the digging pipe 14 is slightly pulled up, as shown in FIG. 4, the packer device 28 is inserted into the digging pipe 14 and lowered until it comes into contact with the shoulder portion 22.

The detailed structure of the packer device 28 is shown in FIG. The packer device 28 is lowered into the digging pipe 14 from the ground side through a hose 30 containing a steel wire and the like. As shown in FIG. 5, a fluid passage 32 such as nitrogen gas is formed in the hose 30, and the passage 32 is a passage 32 in the packer device 28.
It is connected to A, 32B, and the pressure chamber 32C. Pressure chamber 3
A bulge 34 made of rubber or the like is provided around 2C. Therefore, when high-pressure fluid is supplied into the pressure chamber 32,
The bulge 34 can bulge to seal the inside of the hole wall as shown by the chain double-dashed line in FIG.

On the other hand, an inlet 36 for the grout passage is formed in the packer device 28, and the inlet 36 passes through the passages 32A, 32B, 36C formed in the central portion of the packer device 28 and exits the outlet 3.
It will be sent to 8. Check valve 40 at outlet 38
Is provided to prevent the injected grout from flowing backward. FIG. 8 shows the outlet 38 without the check valve.

Further, the packer device 28 is provided with a slide cylinder 42 below the entrance 36. A spring 44 urges the slide cylinder 42 downward. Therefore, when the slide cylinder 42 comes into contact with the shoulder portion 22 of the drill pipe 14, the passage 46 is blocked as shown in FIG. 5, and the grout is sent to the outlet 38 through the inlet 36, the passages 36A, 36B and 36C. When the bulge 34 is contracted and the hose 30 is moved upward, that is, in the upward direction in FIG.
Since the contact state with 2 is released, it is moved downward in FIG. 5 by the urging force of the spring 44 to open the passage 46. As a result, the grout or the like remaining in the digging pipe 14 can be flushed downward, and the packer device 28 can be easily pulled up. Further, the packer device can be quickly moved up and down by a hose reel or the like.

As shown in FIG. 5, a grout inlet 48 is provided in the upper portion of the drill pipe 14, and a seal member 50 is provided between the hose 30 and the drill pipe 14.

The grout work is performed as follows using the packer device configured as described above. That is, first, high-pressure nitrogen gas or the like is supplied from the fluid passage 32 in the hose 30, and the bulging body 34 is bulged and brought into close contact with the hole wall as shown in FIG. In this state, grout is injected from the grout injection port 48 into the digging pipe 14. The injected grout passes through the drill pipe 14,
It is injected from the inlet 36 through the passage 36A, the passage 36B, and the passage 36C to the bottom of the drill hole from the outlet 38. As a result of this, measures will be taken to protect the cracks from water and ground improvement.
After the grouting work is completed, the swelling body 34 of the packer device 28 is reduced and the hose 30 is slightly pulled up.
Moves downward due to the action of the spring 44, and the passage 4
Open 6. As a result, the grout remaining in the digging pipe 14 descends downward, and the packer device 28 can be easily pulled up. Further, by supplying water to the packer device 28 through the grout injection port 48, the inside can be washed.

FIG. 9 shows a state when lateral digging is performed using the grout device according to the present invention. In the lateral direction, the packer device 28 is connected by a hose and cannot be inserted by its own weight like vertical excavation. Therefore, the following measures are taken. A rubber ring 60 is provided on the outer circumference of the packer device 28 at the upper part, and seals between the digging pipe 14 and the packer device 28. The ninth state shows such a state.
This is the packer device 28 indicated by the chain double-dashed line in the figure. If water is supplied in this state as indicated by the arrow, the packer device 28 will be sent to the left in FIG. The digging pipe 14 has a diametrically expanded portion 62 at a predetermined position in advance.
And the rubber ring 60 of the packer device 28 is formed.
When the water reaches the expanded diameter portion 62 of the digging pipe 14, the pressure-feeding water escapes through the expanded diameter portion 62, and the feeding of the packer device 28 is stopped. At this position, the grout work is performed as in the embodiment of FIG.

〔The invention's effect〕

As described above, according to the grout method and the apparatus therefor according to the present invention, the packer device in the hole can be completely brought into close contact with the hole wall by supplying the fluid, so that highly accurate grouting is possible and the wire line method is also available. Since it is possible to carry out the grouting work, it is not necessary to pull out the drill pipe every time the grouting work is carried out, and the efficiency of the grouting work is improved. Further, since the drill pipe is always arranged in the drill hole, the hole wall of the drill hole does not collapse.

[Brief description of drawings]

1 to 3 are explanatory views showing a wireline type core collecting and excavating work, FIG. 4 is an explanatory view showing a state in which a packer device is inserted, and FIG. 5 is a sectional view showing the structure of the packer device. 6 and 7 are explanatory views showing the grout injection work, FIG. 8 is a cross-sectional view showing a modified example of the tip end part of the packer device, and FIG. 9 is a cross-sectional view showing the state of horizontal excavation using this embodiment. It is a figure. 14 ... Drilling pipe, 16 ... Driving source, 18 ... Bit, 20 ... Core collecting pipe, 22 ... Shoulder part, 28 ... Packer device, 30 ... Hose, 32, 32A, 32B ... Fluid passage, 32C ... Pressure chamber, 34 ... Bulging member, 36, 36A, 36C, 38 ... Grout passage, 48 ... Grout inlet.

(72) Inventor Hideki Nakao 2-35-11 Nakadai, Itabashi-ku, Tokyo (72) Shinji Matsutani 26-183, Minami 1-jo Nishi, Chuo-ku, Sapporo-shi, Hokkaido 183-153 Maruyama Broad Heights 407 ( 56) References JP-A-48-60406 (JP, A)

Claims (2)

[Claims] 1. A drill pipe provided with a bit at its tip is rotated to excavate a cracked portion where water blocking measures are required, and then the drill pipe is pulled up by a predetermined amount to form a drill hole below the drill pipe. At the same time, take out the core sampling pipe built into the drill pipe from the drill pipe, insert the packer device into the drill pipe in the state where the drill pipe is pulled up by a predetermined amount, and project the protruding portion of the packer device from the drill pipe tip. Then, the fluid is supplied to the bulging portion, and the bulging portion is bulged to be in close contact with the hole wall of the excavation hole over the entire circumference to fix the packer device and supply the grout to the grout outlet of the packer device. Then, the grout method is characterized in that grout is injected into the crack portion from the grout outlet portion. 2. A drilling pipe having a bit provided at a tip end thereof, into which a core sampling pipe can be inserted and mounted, and a fluid passage and a grout passageway inserted into the drilling pipe, the tip end portion being provided with the fluid. A packer device in which a bulging portion that bulges by a fluid supplied from a passage and is in close contact with a hole wall is provided, and an outlet portion of grout supplied from the grout passage is formed below the bulging portion, A grout device comprising: