JPS58199922A - Grout injection device - Google Patents

Abstract

PURPOSE:To uniformly inject a grout in a thick circular form over a height range into the ground by a method in which coiled wires constituting a strainer are positioned regularly by a spiral trench so as to keep the interval of the coiled wires constant. CONSTITUTION:During boring period, a piston 11 is positioned upwards by the action of a spring 12, and boring water is jetted from a metal crown 2 through the lower side opening 11b of the piston 11 and a pathway 5a. During the grout injection period, one group liquid enters a grout pathway 10 to push down the piston 11, flows into a closed space 14 through the upper side opening 8a of the cylinder 8 and a back flow-preventing part 18a, further flows into a space 14 through the upper side opening 11a of the piston 11, and then mixed in the space 14 with another grout liquid coming from the inside of an inner cylinder 7, the upper side opening 11a of the piston 11, the lower side opening 8b of the cylinder 8, and the back flow-preventing part 18b. The mixed grout liquid is permeated into the ground through the apertures 6 of coiled wires 6 positionally regulated by a spiral trench 4b.

Description

[Detailed description of the invention] The present invention polls the target ground to a desired depth.

This invention relates to a chemical injection device that is connected to the lower end of a double pipe for chemical liquid supply when injecting chemical liquid into the ground to improve the ground strength, water stoppage, etc.

As a method of improving the ground by injecting a chemical solution, first, after polling, an instant-setting gelling agent with a so-called gel time of 20 seconds or less is injected into the target ground at a predetermined depth. A so-called chemical backer is formed using an instant-setting gelling agent to prevent it from escaping upward through the gap between the polling hole and the double tube for feeding the chemical solution, and the gelling time is approximately 1 minute. Inject long-acting gelling agent for ~90 minutes.

There is a method of completely improving the ground by filling in the unimproved areas that have not been covered by the hard-binding gel filler.

The chemical injection device used when carrying out this method is
During poling, drilling water is ejected downward in the axial direction, and during chemical injection, the chemical liquid is ejected outward in the radial direction.For this purpose, two liquid guide paths are generally provided. One of them is used only for feeding the chemical liquid, while the other liquid guiding path is first allowed to pass water during polling, and then becomes a feeding path for the chemical liquid during the chemical liquid corporation.

Since the excavation water spout and the chemical fluid jet port are thus different from each other, the liquid guide path must be switched to them when transitioning from polling to chemical injection. From the standpoint of work efficiency, this switching is done without lifting the chemical injection device to the ground, leaving it at a predetermined depth underground.However, in the case of conventional chemical injection devices, It is difficult to check on the ground whether the switching has been completed or not, and even if it could be done, the complicated structure makes it difficult to manufacture and expensive.

The present invention eliminates such drawbacks and enables the above-described chemical injection method to be effectively carried out. The object of the present invention is to provide a liquid medicine injector that can be formed uniformly into a disk shape, and in order to achieve this object, it is made connectable according to the present invention, and further comprises the following constituent members. It is something.

External cylindrical body: A wire rod is wound around the outer peripheral surface with a narrow gap between each winding, and the wire rod winding has a large number of chemical liquid discharge holes in the part.

Internal cylindrical body: Disposed concentrically within the external cylindrical body with a gap therebetween, and connected to the inner tube of the double pipe.

Cylinder member...Disposed between the above-mentioned external cylinder and internal cylinder, forms a medicinal solution passageway communicating with the external pipe of the double pipe between the internal cylinder and the upper and lower It has a lateral distance of [1].

Piston member: Fitted into the above-mentioned cylinder member so as to be able to slide up and down, and the upper surface forms the bottom surface of the above-mentioned chemical liquid passage.

It is further spring biased upward. It also has upper and lower side passages that communicate with the internal cylinder shown in J-.

The piston member is pushed by the spring force. When in the raised one L position.

Close the upper side passage and lower Connect the side passage to the metal crown.

Also, the piston member feeds the chemical liquid passage. The chemical solution applied resists the spring bias. when in the pressed down position.

Place the upper side passage under the cylinder member. Between the lateral side [1 and the medicine Connect the liquid passage to the upper side of the cylinder member. communicate with the opening.

Backflow prevention member: attached to the upper and lower side openings of a cylinder member.

Hereinafter, the present invention will be explained in more detail based on the illustrated embodiments.

In FIG. 1, 1 generally indicates a chemical liquid injection device according to the present invention, and the upper end of this chemical liquid injection device is connected to a double pipe (not shown) for supplying drilling water and chemical liquid. , the lower end can be connected to the metal crown 2 with a bit. The drawing shows a connecting pipe 3 with a double pipe at its upper end.

The chemical liquid injector 1 has an external cylindrical body 4, which is screw-coupled to the connecting pipe 3 in a double manner, and a check valve mounting member 5 is screw-coupled to the lower end. . External cylinder body 4
has a diameter-reduced step 4a on its outer peripheral surface, and the wire 6 is wound around the diameter-reduced step 6 in a spiral shape. Preferably, this wire 6 is as shown in the third and 41A,
1ξ1. formed on the diameter-reduced step portion 4a. (If the winding is f=J along the l rotation tilj+b, then

A strainer gap 1Q6ad for spraying the chemical solution is formed between each wire winding or coil, and at this time, earth and sand do not enter through the strainer gap 6a7.

The dimensions of the wire rod 6 and the spiral groove 4b are also determined. By doing so, even if the wire is subjected to force that causes frictional contact with the surrounding L sand etc. during poling and causes deviation or deformation of the phase tf of each winding, the winding hole gap can be resisted. can be maintained constant.

In addition, the double diameter-reducing stepped portion 4aK is included with the aneurysm/circle A'Gab.

As shown in FIG. 3, a large number of chemical liquid discharge holes 4c are provided. In the illustrated example, this chemical liquid discharge hole has a long hole shape and a zigzag arrangement V.
Of course, other shapes and arrangements may be used. For example, the shape of the discharge hole 4c is as follows.

They may be round, oval, rectangular, or slit-shaped, and their arrangement may be staggered or vertically and horizontally arranged.

] Inside the double external f12i body 4, internal cylinders 7 are arranged concentrically at appropriate intervals, one end of which communicates with the inner pipe of the two city pipes described in 1111, and the lower end of which has a reduced diameter. Midway through the step 11. , has reached around 'I'.

A cylinder member 8 is disposed between the outer cylinder 4 and the inner cylinder 7 described in -1-, and this cylinder member extends further downward from the lower end of the inner cylinder 7. The lower end is threadedly connected to the upper part of the check valve mounting member 5 described in 1) 1f. The upper end of the cylinder member 8 is screwed onto an inner head 9 fitted into the outer body 4. Between the inner head 9, the cylinder member 8, and the inner cylindrical body 7, there is provided a passageway 10 through which the outside of the double pipe t1·K passes. Further, the cylinder member 8 is provided with an upper side gap (18a) at a location slightly above the lower end of the internal cylinder body 7, and a lower side gap (18a) is provided at a position below the bottom ☆lij of the internal cylinder body 7. Opening 8bX>ζ provided.Each 41t1
In the case of the embodiment shown in FIG. 1, a backflow prevention member is provided on the H for one side and one for one.

This backflow prevention member is made up of rubber sleeves 18a and 18b that are fitted into step portions 8c and 8d, respectively, of the sleeves 1 provided on the outer periphery of the cylinder member 8.

A piston member 11 is located inside the cylinder member 8 shown in 1-.
is inserted into the if function that slides up and down, and its "-3.1
The lower end of the internal cylinder 7 is inserted into the ``1'' section.

Further, one end surface constitutes the bottom surface of the chemical liquid passage 10 between the internal cylinder body 7 and the cylinder member 8. Piston 1"
The 11S material 11 is biased in the negative direction by a compression spring 12 inserted between its lower end and the check valve member 5, and its two-way movement is caused by the internal cylindrical body 7. It is regulated by appropriate stopping means provided between the

The piston member 11 is arranged in two stages, upper and lower)
'A side passage 11a and a lower side passage 11b are provided.

As is clear from the figure, these are all inside the double pipe.
i'. The piston member 11 is the first
When in the I] position shown in the figure, the upper side passage 11
1 is closed by the inner wall of the cylinder member 8, but the lower side passage 11b communicates with a passage 5a provided in the check valve mounting member 5. On the other hand, as shown in FIG. 2, when the piston member 1] is pushed down against the action of the compression spring 12 by the chemical liquid sent to the outer tube and reaches the lower position, the upper side passage 11a is communicated with the lower side opening 8b of the cylinder member, and the lower side passage 11
b is configured such that the lower end of the piston member fits into the fitting hole 5bi formed in the upper part of the check valve mounting member 5, thereby cutting off communication with the passage 5a of the check valve mounting member 50. Note that when the piston member 11 is in the lower position.

Chemical liquid passage 1 between internal 11i body 7 and cylinder member 8
0 communicates with one side opening 8a of the cylinder member.

An elastic sleeve 13 made of rubber or the like is in contact with the inner circumferential surface of the outer cylinder 4 corresponding to the strainer forming portion, and the upper and lower ends of this elastic sleeve have an annular mounting surface that protrudes radially inward. It is fixed to the cylinder part 8 by fitting it into a corresponding annular groove provided on the outer circumferential surface of the cylinder part 8, thereby creating a closed space 14 inside thereof. A large number of slits (not shown) are formed in the elastic sleeve 13 over almost its entire length.

A check valve case 1 is installed at the bottom of the above-mentioned Toichi valve handle f and J member 5.
5 are screwed together, and a steel ball 16 is held inside the check valve case to be pressed against a conical valve seat 5C formed at the lower end of the passage 5 of the check valve mounting member. . The steel pole 16 is pressed against the valve seat 5 by the compression spring 17.
C, thereby closing the passage 5a.

Therefore, as can be easily understood, when drilling water is forced into the passage 5a, the ball 16 is pushed down by the drilling water and allows it to flow down, but when the chemical liquid is injected, the chemical liquid flows back from the direction of the metal crown 2. If so, the entry into the passage 5a is prevented.

1. The night injection device a according to the present invention described in 1. operates as follows.

First, at the time of polling, the piston member 11 bounces off the spring 12.
It is in one position -I shown in FIG. 1 under the action of .

Therefore, the chemical injection device supplies the drilling water supplied to the inner pipe of the double pipe to the inner cylinder 7. Between the lower sides of the piston member Ll 111
) and from the metal crown 2 through the passage 5a of the check valve mounting member, and at the same time, the entire rod consisting of the double pipe and the chemical injection device is rotated to perform polling to a predetermined depth.

Next, when injecting the drug, one of the two types of mWl constituting the v4 gelling agent (preferably a long-lasting gelling agent alone) is fed into the outer tube, and this The chemical liquid enters the chemical liquid passage 10 between the inner cylinder body 7 and the cylinder member 8, and pushes the piston member down to the lower blade position shown in FIG. the result.

Upper side opening D8al of the cylinder member 8=opening to the above-mentioned chemical liquid passage lO and opening the same passage to the elastic sleeve 13
The inner side of the piston member 11 is closed, and the flow path from the lower side passage 11b of the piston member 11 is closed on the one hand, and the upper side passage 1 tsubo of the piston member 11 is connected to the cylinder member on the other hand. The inner pipe is aligned with the lower side opening 8b to allow communication with the closed space 14. In this state, the other of the two types of chemical solutions is fed into the inner tube. In this way, the two kinds of chemical solutions from the outer tube and the inner tube push aside the M flow prevention members 18a and 18b and open [l18
A and 8b flow into the closed space 14, where they merge and mix into a siliceous phase -rI. When the closed space 14 is filled with the mixed chemical solution and the pressure increases, the chemical solution pushes open the slit of the elastic sleeve 13 and is discharged from the chemical solution outlet 4c provided in the external sieve body 4. When passing through the wire net, When passing through the slits between the windings, the mixture undergoes a mixing action and becomes a completely bound gelling agent, which is injected into the ground. At this time, accompanying chemical/
<'7 cars are formed.

By blowing, liquid feeding to the inner tube is stopped, or liquid feeding to the inner tube is switched to a long-lasting gelling agent similar to that used in the outer tube. , i'I region is improved. If this is done, the disc-shaped range having a thickness corresponding to the winding range of the wire rod (ie, the strainer forming part) will be completely improved.

Hereinafter, 1. As stated above, according to the present invention, -
i-ll! To confirm whether the flow path to the liquid has been completely switched, check that the piston member has moved to the lower position.

In other words, since the chemical solution can be continuously supplied from the outer tube, it can be confirmed from the ground, and at the same time, the position of the wire that makes up the strainer section is regulated by the spiral groove, making it possible to resist the effects of various forces received from the surroundings during polling. Nevertheless, the 9-turn interval can be maintained constant, and therefore, the liquid drug injection device of the present invention makes it possible to carry out the above-mentioned method of injecting liquid into the calyx very effectively and completely.

[Brief explanation of drawings]

FIG. 1 is a central vertical cross-sectional view of the liquid drug injection device according to the present invention during polling. FIG. 2 is a central vertical cross-sectional view of the same device during cutaneous injection. FIG. 3 is a perspective view of an external cylinder that is a component of the device. FIG. 4 is a longitudinal cross-sectional view of a part of the outer cylindrical body on which the wire rod is troughed. Note that the correspondence relationship between the main parts shown in the figures and the symbols is as follows. l... Chemical injection device, 2... Metal crown with bit, 4... External cylinder, 4b.
...Spiral groove, 4c...Two-storey liquid discharge 1.6...Wire rod, 7...Inner cylinder, 8
...Cylinder member, 8a...5L side distance [1°8b...-F', /J side distance [Tl, 10... Mulberry liquid passage, 11...Piston member, 11a...''One side passage, 11b
...... Side passage on the side, 18a, 18b
...Backflow prevention member. Patent applicant Toa Grout: Dodo Co., Ltd.
Patent attorney representing Tonan Kaihatsu Kogyo Co., Ltd. 1) Osamu Shimizu/'-\ Figure 4

Claims (1)

[Claims] f/) whose upper end is connected to a double pipe for feeding drilling water and a certain amount of water,
A chemical liquid injection device whose lower end can be connected to a metal crown with a bit. A wire rod (6) with a V-shaped outer circumferential surface is wound with a narrow gap between each winding.
) and an external cylindrical body (4). They are arranged concentrically within this outer cylinder with a gap between them. and an inner cylindrical body (7) connected to the inner pipe of the double-double pipe. ” is arranged between the double outer cylinder (4) and the inner cylinder (7), and forms a chemical liquid passageway (lO) communicating with the outer pipe of the double pipe with the inner cylinder (7). and a cylinder part (8) having side openings (aa, ab) on the upper and lower sides
)and. Inside this cylinder member, the upper surface is connected to the above chemical liquid passage (10).
In the K'7M state, the inner cylinder (7) is slidable up and down and is fitted with a spring bias in the -1 direction.
It has upper and lower lateral passages (IIIL. 11b) communicating with the upper and lower lateral passages (IIIL. A passageway (llb) communicates with the metal crown (2), and also communicates with the medicinal solution passageway (llb).
The upper side passageway (11a) is pushed down against the spring bias by the chemical solution fed into the upper side passageway (11a).
d: Lower side opening (8b) of the above cylinder member (8)
), and a piston member (11) that communicates the chemical liquid passage (10) with the one side opening (8a). ” - L between the upper and lower sides of the cylinder member (8)
j (8a, 8b) attached to the backflow prevention member (
lea. 18b) A foot Ffkf injection device comprising: (2. In the chemical liquid injector according to claim 1, a spiral groove (4b) is formed on the outer circumferential surface of the external cylinder (4), and the wire (6) is wound along the spiral groove. equipment.