JPS598821A - Grout injection rod for improving ground - Google Patents

Abstract

PURPOSE:To simplify the operations till the injection of grout by a method in which a fluid passage is provided in a pressure fluid-supplying aperture between a protective sleeve tube and a liquid tube to be touched by the sleeve tube in such a way as to enable the communication between the aperture and the passage to be interrupted or allowed. CONSTITUTION:A fluid passage 14 is provided in a pressure fluid-supplying aperture 15 between a protective sleeve tube 7 and a liquid-passing tube 9 in contact with the tube 7 in such a way as to enable the communication between the aperture 15 and the passage 14 to be interrputed when a group injection part 5 is pulled into the sleeve tube 7 but to be allowed when the injection part 5 is exposed. When a pressure fluid is sent into the aperture 15, the tube 9 and the injection part 5 are pushed downwards, and when the sleeve tube 7 is pulled up, the injection part 5 and a rubber sleeve 12 above the part 5 are exposed. At the same time, the passage 14 is led to the aperture 15 and the pressure fluid is flowed into the aperture 15 to expand the sleeve 12.

Description

[Detailed Description of the Invention] In particular, it has a liquid guide pipe that feeds the chemical liquid to the lower end of the chemical liquid injection part (τ), and a protective sleeve pipe is fitted on the outside of this liquid guide pipe, and during polling, The present invention relates to a chemical liquid injection lot in which the chemical liquid injection part is drawn into a protective sleeve pipe, and the chemical liquid injection chamber 0/packer is exposed from the protective sleeve pipe during chemical injection.

Conventionally, when performing ground improvement by injecting chemicals, first the target ground is polled using a drilling lot, then the drilling lot is pulled out and replaced with a mechanical backer, strainer type chemical injection part, etc. The chemical liquid was injected by inserting a chemical liquid injection rod attached to the lower end. However, using two lots like this,
It was disadvantageous in terms of cost, it was labor-intensive, and there were other problems such as the hole wall collapsing when pulling out the hole drilling lot and interfering with the insertion IC of the chemical injection river mouth throat. A method has been proposed in which the rod is also used as a hole drilling lot, and after polling, the rod can be directly used for chemical injection without having to pull it out. However, on the other hand, this method prevents the bunker three 7 made by Com, which has a lot circumference of 1" lJ i'c F&, from being damaged due to friction with earth and sand during polling and being destroyed early. In addition, there are problems such as mud or slime entering the strainer of the chemical injection part and obstructing the injection of the chemical liquid.Therefore, as shown in @, a protective sleeve is installed on the outside of the liquid injection lot. A method has been proposed in which the tube is opened and the drug solution injector is pulled into the protective sleeve tube during boring, and the drug solution injector is exposed from the protection sleeve tube when the drug is injected.

The present invention, in such a lot for press-injecting a chemical liquid, allows the mechanical packer to be inflated immediately after the packer and the chemical injection part are exposed after making Bolinog confectionery, thereby simplifying the series of operations up to the injection of the chemical liquid. Moreover, the purpose is to ensure that the bunker effect is not lost.

In order to achieve such an object, the present invention provides a liquid injection lot of the above-mentioned type, in which a rubber sleeve is attached to the liquid guide pipe inscribed in the protective sleeve tube at a position above the liquid injection part, so that the upper and lower ends thereof are - an opening L1 on the inside of this rubber sleeve on one side, and an H provided between the protective sleeve pipe and the liquid guide pipe inscribed thereon on the other hand.
A fluid passageway opening into the E force fluid feeding gap is provided, further preventing communication between the fluid feeding gap and the fluid passageway when the drug solution injector is being drawn into the protective sleeve tube, and on the other hand,
A means is provided for allowing communication between the liquid injection part and the liquid injection part when the part is exposed.

In the chemical liquid injection rod according to the present invention, after the poling operation, pressure fluid is fed into the pressure fluid feeding gap provided between the sleeve tube and the liquid conduit tube inscribed therein, whereby the liquid conduit tube and the liquid conduit tube are The protective switch IJ-)W is pulled up while pressing the connected chemical injection part downward, or the entire lot is pulled up slightly after polling, and then a pressure sounding body is sent into the pressure fluid feeding gap. As a result, the drug solution injection part and the packer are pushed out, and the fluid passage that opens inside the comb sleeve is completely opened when the drug solution injection part and the comb sleeve provided above are completely exposed. It communicates with the feeding gap and brings the ff force fluid to the inside of the rubber sleeve, causing it to swell. Therefore, according to the present invention, the work flow from after drilling to the completion of preparation for chemical injection can be streamlined and smoothed. This is done quickly, and during the bow link, damage to the rubber sleeve and clogging of the strainer in the chemical injection part are completely avoided, resulting in a reliable bunker effect and reliable jetting of the chemical liquid. be.

The present invention will be further explained in detail below with reference to the accompanying drawings.

FIGS. 1 and 2 schematically show the state of the lot for medical solution injection according to the present invention immediately after polling and the state at the time of injection of the drug solution, respectively. In the figures, 1 indicates the lot for drug solution injection;
2 is a polling machine, 3 is a lot lifting device that constitutes a part of the polling machine, and 4 is a swivel installed at the upper end of the lot for introducing pressure fluid and chemical liquid into the lot. After polling, as shown in FIG. 2, only the protective sleeve tube or casing 7 is pulled up to expose the chemical liquid injection part 5 and the packer 6, or after the whole lot is slightly pulled up, the chemical liquid injection part 5 is lifted up. The packer 6 is pushed out from the protective sleeve pipe, and then the packer 6 is inflated, and then the chemical liquid is sent through the swivel 4 and the chemical liquid injection part 5 is also ejected as shown by the arrow and injected into the target ground.

Figures 3 to 5 show an example of a liquid injection lot according to the present invention, and Figures 3 and 4 show the line III-IV, and Figures 4 and 5 show the line IV-V. It is continuous in the part.

In this embodiment, the liquid guiding pipe for feeding the chemical liquid to the chemical liquid injection part 5 at the lower end is made up of a 2M pipe consisting of an inner tube 8 and an outer tube W9. Parts 8a and 8b (Fig. 3) and connecting part 8c (Fig. 4)
(Fig. 5), while the outer tube 9 extends from the My Bell 4 to the expansion/contraction adjustment parts 9a, 9b.
(Figure 3) and connector 9c (Figures 4 and 5)
It extends further below the inner tube 8 via the inner tube 8 (FIG. 5). On the outside of these liquid guide pipes 8゜9 and the chemical liquid injector 5 connected thereto, a protective sleeve pipe 7 is provided with a gap between it and the liquid guide pipe (outer pipe) 9 that is inscribed therein, and the side j
It is fitted in such a way that sliding movement in the linear direction is possible. A metal crown 11 that connects to the excavation blade 10 is screw-coupled to the lower end of the protective sleeve pipe 7 of C.

As shown in FIG. 4, a reduced warp portion 9d is formed over a certain length range on the outer periphery of the outer tube 9 (above the drug solution injection portion 5), and a bunker is provided in this reduced warp portion. A comb sleeve 12 is fitted for effect, the upper end of which is fastened by a clamp 13 and thereby sealed against the outer tube 9.

In order to bulge out the comb sleeve 12, the rubber sleeve 12 is passed through the central part of the reduced warp section 9d.
A fluid passage 14 that opens inside the outer tube 9 extends in the -F direction, and its upper end connects the protective sleeve tube 7 and the liquid guide tube (i.e., the outer tube 9) inscribed therein. It opens into a pressure fluid feed gap 15 provided therebetween (FIG. 3). An O-ring 16 is fitted on the outer tube 9 above this upper opening, so that the fluid passage 14 and the pressure fluid feed gap 15 are also blocked off when the bow 977 occurs. however,
For example, when the protective sleeve tube 7 is pulled up and reaches the upper end position 1 (FIG. 6, 9, the annular recess 17 provided on the inner peripheral surface of the sleeve tube 7 is connected to the gap 15 and the passage 1) prior to the injection of the chemical solution.
Brings communication with 4. In this case, in order to prevent the pressure fluid from escaping downward, another O-ring 18 is fitted in the outer tube 9 below the upper opening of the fluid passage 14.

As shown in FIGS. 3 and 6, a step 9e is formed in the outer tube 9 above the O-ring 16, and the pressure fluid supplied to the gap 15 acts on this step. This generates a force that pushes the outer tube 9 downward, and in this state, the protective sleeve tube 7 is pulled up. In some cases, the entire lot may be pulled up a necessary distance, and then pressure fluid is applied to push out and expose the chemical injection part and packer.

The detailed structure of the chemical liquid injector 5 shown in FIGS. 5 and 7 is not a subject of the present invention, so a detailed explanation thereof will be omitted.
Its operation will become clear from the following description of its operation.

First, at the time of polling, the lot for chemical injection is in the states shown in numbers 3 to 5. In this state, the lot is rotated and gradually pushed into the ground, and at the same time the inner tube 8
Excavation water is pumped to. The drilling water reaches the chemical injection part 5,
From there, the lower f11 of the piston 7 opening 19] opening 19b
and check valve mounting part] The valve ball 21 passes through the passage 20a of A20.
Press down and it will be ejected downward. After polling has been carried out to a predetermined depth, the excavation water is supplied and
・The rotation of should be stopped.

Then, for example, 7
'flcr! This pressure fluid acts on the stepped portion 9e' of the outer tube 90 and presses the outer tube 9 and the liquid medicine injector 5 connected thereto downward. In this state, the protective sleeve tube 7 is pulled back, and the chemical liquid injection part 5 and the rubber sleeve 12 are exposed to the drilled hole. When the purulent storage sleeve tube 7 is pulled up, the upper halves of the inner tube 8 and the outer tube 9 are adjusted by expansion/contraction adjustment parts 8a, 81) and 9a, gb.
By following the movement of the sleeve tube 7, the mutual position of the upper end of each tube with respect to the swivel 4 is avoided.

As soon as the protective sleeve tube 7 is pulled up and reaches its upper end position (FIG. 6), the pressure fluid in the pressure fluid feed gap 15 flows into the fluid channel 14 through the annular recess 17 and the rubber sleeve 12 Get to the back side and bulge it out. After the rubber packer is inflated in this manner, one of the two types of chemical liquids constituting the instant-setting gelling agent is fed to the outer tube 9, and this chemical liquid reaches the chemical liquid injection part 5. (FIG. 5), the piston member 19 is pushed down to the lower position shown in FIG.

As a result, the child side opening 22a of the cylinder member 22 opens into the medicinal liquid passage 23, making it possible to communicate the passage with the closed space 25 inside the elastic sleeve 24, and at the same time, the piston part is opened on one side. 19 lower side passage 19F
) is closed, and on the other hand, the upper side passage 19a of the same member coincides with the lower side 1] 22b of the cylinder part t11'22, thereby communicating the inner pipe 8 with the closed space 25 described above. It's possible. In this state, the other of the two types of chemical solutions is fed to the inner W8, and thus the outer tube 9 and the inner tube 8
The two types of chemical solutions from the backflow prevention members 26 & and 26
b - C from the openings 22a and 22b to the closed space 2
5, where they merge and mix with each other. When the closed space 25 is filled with the mixed chemical and the pressure increases, the chemical liquid pushes open the slit formed in the elastic sleeve 24 and is discharged from the chemical liquid discharge port 9a provided in the outer tube 9, and is discharged from the wire rod 2.
It is ejected uniformly from the slits between the windings or coils and permeates into the target ground. When the chemical solution passes through the slits in the elastic sleeve 24 and through the narrow gaps between the windings, it is further mixed by a complete instant-setting gelling agent (with a Kel time of 20
(less than a few seconds) and is injected into the ground.

Next, the liquid feeding to the inner tube 8 is stopped for one time, or (.) the liquid feeding to the inner tube 8 is changed to a long-term gelling agent (gelling time is about 1 to 90 minutes) similar to the outer tube 9. In other words, the area where the wire rod 270 is wrapped (in other words, the strainer forming part) has a circular 0-shaped area with a thickness equivalent to V. is completely improved.

As described above, in the chemical liquid injection lot according to the present invention, after polling, the chemical liquid injection part and the rubber sleeve for the packer are exposed from the protective sleeve pipe, and the packer is automatically expanded, so that the chemical liquid injection can be performed. It shortens the working time and enables quick drug injection, and at that time,
Of course, the mechanical packer completely prevents the chemical from escaping, and also completely protects the packer and the chemical injection part from friction and clogging.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the state of the lot for drug injection according to the present invention immediately after polling, FIG. Figure 4 is a vertical cross-sectional view showing the vicinity of the packer, Figure 5 is a vertical cross-sectional view showing the vicinity of the chemical solution dwelling area, and Figure 6 is a lot not shown in Figures 3 to 5. FIG. 7 is a vertical cross-sectional view of the vicinity of the packer 4, illustrating the flow path of the pressure fluid when the packer is inflated. FIG. 1 Lot L for drug injection, 5...Medicine# injection part, 7...Protective sleeve tube, 8, 9 Liquid guide tube (8...Inner tube, 9...
・・Liquid guide pipe inscribed in the outer pipe or protective sleeve pipe) 12
Comb sleeve, 14...Fluid passage, Work 5...Pressure Jt body feeding gap. Patent applicant: Toa Grout Industries Co., Ltd. Representative Patent Attorney
Mokuji Tashiro

Claims (1)

[Claims] It has a liquid conduit pipe for feeding the chemical liquid to the chemical liquid injection part at the lower end, and a protective sleeve pipe is fitted on the outside of this liquid conduit pipe, and during polling, the chemical liquid injection part is fitted with a protective sleeve. In a type of chemical injection lot where the drug e, injection part, and packer are exposed from the protective sleeve pipe when the liquid is injected into the pipe, the liquid injection part is attached to the liquid conduit pipe inscribed in the reinforcing sleeve pipe. At the upper part, a comb sleeve is fitted with the upper and lower ends rounded, and one side opens inside the comb sleeve, and the other side connects the protective sleeve pipe and the liquid guide pipe inscribed therein. A fluid passage is provided that opens into the pressure fluid feeding gap provided in between, and furthermore, when the chemical liquid injector is drawn into the protective sleeve pipe, communication between the fluid feeding gap and the fluid passage is prevented. On the other hand, a chemical liquid injection lot for ground improvement characterized by being provided with means for allowing communication between the chemical liquid injection part when the chemical liquid injection part is exposed.