JPH0819668B2 - Hose type chemical liquid injector and injection method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement chemical injection device, and more particularly to a hose type chemical injection device and method in a one-shot injection system.

[0002]

2. Description of the Related Art As is well known, a chemical injection method is widely adopted for ground improvement. Among them, the one-shot injection method is one in which the main agent (liquid A) and the curing agent (liquid B) are mixed in advance at a predetermined mixing ratio and then pressure-fed and injected in the state of one liquid (A + B). It is applied to slow-moving injectables with a time of several tens of minutes. In recent years, there is a tendency that the injection depth becomes deeper as the construction scale becomes larger, and there is an increasing demand for a long injection device (for example, 20 m or more) capable of coping with this.

The structure of a conventional one-shot injection hose type chemical liquid injector is such that two packers (double packers) are provided above and below a cylindrical tip (monitor) and a discharge port is provided between both packers. And a flexible double-tube hose is connected to it (see, for example, JP-B-63-43235 and JP-B-63-44893). In these,
By inflating the double packer, which is in a contracted state when the injection device is inserted and removed, when it injects the chemical liquid, and intimately contacting it with the outer tube (Manchette tube) built in advance
It is possible to prevent the chemical solution from flowing out to the tip and base (ground) sides, and to effectively eject the chemical solution into the ground. The expansion / contraction of the double packer is controlled by pumping and releasing a pressure fluid such as water at the base. Therefore, one flow path of the double tube hose is used for the chemical liquid, and the other flow path is used for the pressure fluid for expanding the packer.

In addition, when the monitor is inserted or removed, the double-tube hose is pushed in and pulled up, and the position of the monitor is controlled by detecting the moving distance of the double-tube hose. The double pipe hose is continuous or connected through a joint or the like. Further, in order to give flexibility to the tip portion, there is also one in which both packers are connected with a flexible material.

[0005]

In the chemical solution injection method, the chemical solution discharged from the inserted monitor is sprayed into the ground through the rubber slit of the Manchette tube. However, the chemical solution remaining in a slight gap between the monitor and the manchette tube may adhere and cure, so that the monitor may be captured by the manchette tube. As a result, it becomes difficult to pull up the monitor to move to the next injection position, and further, a situation in which pulling up becomes impossible, so-called jamming occurs.

A conventional double packer monitor connected with a double tube hose has a structure in which the entire monitor is integrated,
In addition, the monitor and the hose are firmly connected or integrated by screwing or the like. Therefore, if the above-described germing occurs, if the pulling force is forcibly attempted, the soft hose portion will be broken, that is, torn. In the case of a connection type hose, the joint part often breaks. As a result, the monitor cannot be recovered, and the hose cannot be reused.

Next, the positioning of the monitor at the location where the chemical solution is ejected is conventionally performed by detecting the moving distance of the hose. When the monitor is pulled up by the hose, the load of the entire injecting device, friction with the manchette tube during movement, resistance due to deposits, etc. are all applied to the hose. Especially when the length is long, the burden becomes large. However, since the hose is flexible, for example, made of rubber, when it is pulled up by such a strong force, the hose stretches. This elongation causes a deviation in the originally specified dimensions. If the hose size changes, the monitor position determined accordingly also shifts.
This deviation increases as the injection process is repeated. Eventually, the injection agent will be injected toward the part without the injection port on the Manchette tube, and not only will it not be injected into the ground, but the overpressure will cause the chemical solution to flow out toward the base and the tip. , Between the monitor and the Manchette tube will fill up and cause jamming.

Further, the double pipe has a complicated structure of a connecting portion such as a base and a hose, a hose and a monitor, or a hose,
There is a problem with durability and reliability. In addition, the efficiency of work such as connection, cleaning, and repair is not good. In addition, in the case where the both packers are connected to each other by a flexible material at the tip portion, the portion hanging easily at the time of pulling is also likely to be damaged from this portion.

An object of the present invention is to solve various problems in the above double pipe hose type injection device. That is, (a) prevent the hose from being damaged during germing and enable reuse of the hose, and (b) allow the monitor to be smoothly inserted into and removed from the manchette tube,
Moreover, it is possible to avoid the deformation of the hose due to insertion and removal and to accurately determine the monitor position, and c) realize a simple structure that is durable and reliable, and has good workability.

[0010]

In order to achieve the above object, a hose type chemical liquid injector according to the present invention has a cylindrical first, packer shaft having two flow paths in the axial direction.
The packer part, the discharge part, and the second packer part are sequentially fitted and annularly mounted, and further, the above-mentioned parts are fixed by attaching a tip cap to the tip of the packer shaft, and both packer parts are each made of an elastic body. The discharger has a packer that expands and contracts by a pressure fluid, and the discharge unit has a support pipe and a discharge port for a chemical liquid that penetrates a wall of the support pipe. One of the two flow paths is provided to both packers. A double packer monitor having a branch that communicates with the other and a branch that communicates with the discharge port; a hose that communicates with the two flow paths of the monitor and that is connected to the head of the monitor; And at least one wire rope connected to the head of the monitor.

Further, in the hose type chemical liquid injector, the tip cap is attached to the tip of the packer shaft by a shear pin. Further, in the hose type chemical liquid injector, the hose is composed of two single-tube hoses.

According to the method for injecting a chemical liquid according to the present invention,
A cylindrical first packer part, a discharge part, and a second packer part are sequentially fitted and annularly fitted to a packer shaft having two flow paths in the axial direction, and a tip cap is attached to the tip of the packer shaft. By fixing each of the above parts, a packer made of an elastic body is provided on each of the packer parts, the packer is expanded and contracted by the pressure fluid, and the discharge part is discharged with the chemical liquid penetrating the support pipe and the pipe wall of the support pipe. An outlet is provided, and a branch provided in one of the two flow paths communicates with both packers, and a branch provided in the other one communicates with the discharge port to form a double packer monitor. A hose connected to each of the two flow paths of the monitor is connected to the head, at least one wire rope is further connected to the head of the monitor, and the wire rope is pushed in and pulled up to insert and remove the monitor. Performs work, controlling the monitor position by measuring the moving distance of the wire rope.

Further, in the above method for injecting a chemical liquid, when the tip cap is attached to the tip of the packer shaft by a shear pin and the monitor cannot be pulled up by a normal pulling operation at the time of germing, the wire rope is further pulled. The shear pin is sheared by raising, the fixing of the tip cap and the packer shaft is released, and the wire rope, the packer shaft, and the hose are pulled up and collected.

[0014]

According to the present invention, the monitor has a packer shaft, and the first packer portion, the discharge portion, and the second packer portion each having a cylindrical shape are sequentially fitted to the packer shaft, and are annularly provided. Furthermore, by attaching a tip cap to the tip of the packer shaft, the above-mentioned parts are fixed, and both packer parts and the discharge part are prevented from falling off. Particularly, in the case of a long length where the above-mentioned germming is likely to occur, it is effective to attach the tip cap with a shear pin. When jamming occurs in a long hole, pulling the wire rope causes a very strong shearing force to be applied to the shear pin that attaches the tip cap to the packer shaft, and as a result of the pin breaking, the packer shaft, both packer parts and the discharge The fixing of the packer part is released, and both the packer part and the discharge part can come off from the packer shaft. Therefore, it is possible to collect the packer shaft together with the two hoses, while leaving both the packer section and the discharge section, which are captured by the adhered matter between the manchette tube and the manchette tube, in the ground. The hose thus recovered can be reused without any damage.

Further, according to the present invention, an inserting / removing operation can be realized in which no force is applied to the hose. In the present invention, the wire rope is connected to the monitor, the wire rope is pushed in,
The entire injection device is inserted and removed by pulling up. The wire rope has not only sufficient strength to perform a normal insertion / removal operation, but also sufficient strength to break the shear pin of the tip cap by pulling it up during germing. Moreover, in a normal insertion / removal operation, since the rigidity and appropriate elasticity for transmitting the pushing force are provided, the monitor can be smoothly inserted into the Manchette tube. As described above, since the force is not applied to the hose during the insertion / removal operation, the hose is not deformed (elongated) or damaged.

Further, in the present invention, the control of the monitor position is performed by
The moving distance of the wire rope is measured by detecting means such as an optical sensor. Unlike the hose, the wire rope does not stretch even when it is pulled up strongly, so very accurate position control of the monitor can be realized. Moreover, there is no problem even if the injection process is repeated. Further, according to the present invention, the monitor and the hose can be easily separated, and the monitor can be disassembled into independent parts of the packer shaft, the packer part, and the discharge part only by removing the tip cap. Therefore, the respective parts can be easily replaced and cleaned, and can be easily reassembled.

According to the present invention, it is also preferable to use two single-tube hoses connected to the monitor. In this case, since the structure of the connecting portion is simple, it is difficult to damage and the connecting work is easy.

[0018]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a vertical cross-sectional view showing one embodiment of a one-shot hose type liquid injector according to the present invention. Injection device 1
Reference numeral 0 is composed of a monitor 11, and two hoses 12 a and 12 b with caps connected to the monitor 11 and a wire rope 13. The monitor 11 is the packer shaft 1.
4 and a cylindrical first packer portion 15, a discharge portion 16, and a second packer portion 17 which are provided in a ring shape. The monitor 11 includes a packer shaft 14 made of stainless steel or the like that passes through the two flow paths 18a and 18b, and the first packer unit 1
5, the discharge unit 16, and the second packer unit 17 are sequentially inserted from the front end direction so as to be freely inserted and removed, and are annularly provided. Packer shaft 1
The front ends of the two flow paths 18a and 18b of No. 4 are O
Plug 20 with packing for rings 19a, 19b
It is sealed by a and 20b. First packer unit 1
5, the discharge portion 16 and the second packer 17 have their proximal ends abutting on the stepped portion formed on the packer shaft 14, and the tip cap 21 is attached to the tip so as not to slip off from the shaft. It is sandwiched between and fixed. FIG. 1 shows an embodiment in which the tip cap 21 is attached by a shear pin 22. As will be described later, the structure in which the tip cap 21 is attached by the shear pin 22 has an injection device 1 at the time of germing.
It plays an important role in protecting and recovering the zero hoses 12a and 12b. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 and shows the tip cap attached by the shear pin 22.

The first packer unit 15, the discharge unit 16, and the second packer unit 17 are independent, substantially cylindrical components. The first packer unit 15 includes a tubular packer 31 made of an elastic material such as synthetic rubber, fixing tools 32a and 32b for fixing both ends of the packer, and O-rings 33a and 33b for sealing. The discharge part includes a support pipe 41, several discharge ports 42 provided so as to penetrate the pipe wall around the central step part thereof, and a check rubber 43 with a band-shaped slit wound around the step part (natural rubber). Etc.) and O-rings 44a and 44b. Second packer unit 16
Has the same structure as the first packer unit 15, and the packer 3
6, and includes fixing members 37a and 37b and O-rings 38a and 38b.

Two flow paths 18a, 1 of the packer shaft 14
Of 8b, one has two branches 26 and 27 communicating with the respective packers of the first and second packer sections 15 and 17, and the other has a branch 28 communicating with the discharge port of the discharge section. The former is the flow path 18a for the packer pressure fluid, and the latter is the flow path 18b for the chemical liquid. For example, water is used as the pressure fluid. The O- ring used is universal.

Screw holes 51a and 51b for connecting a hose are provided in the monitor head 50 on the base side of the monitor 11. Mounting bolts 52a and 52b at the tip of the hose are connected to the screw holes 51a and 51b. The two connected hoses 12a and 12b are the packer hose 1 respectively.
2a communicates with the packer flow path 18a of the shaft, and the chemical solution hose 12b communicates with the chemical solution flow path 18b of the shaft.

In addition to the screw hole 51 for connecting the hose, a rope socket 53 for connecting the wire rope 13 is installed in the monitor head 50, and the wire rope 13 made of stainless steel, for example, is connected thereto.

FIG. 3 is a top view of the monitor 11 of FIG. Hose 12a, 12 centered on the wire rope 13
b are arranged on both sides and are connected in a well-balanced manner. Then, for example, using the wire rope 13 as a core wire, the hose 1
2a and 12b are wound around Z or S, and are wound around.

In the embodiment of FIG. 1, the monitor has a diameter of 36 m with respect to a Manchette tube having a diameter of 40 mm.
m, length 640 mm, packer length 230 mm, wire rope diameter 4 mm, maximum tensile load 900 k
gf. The total length of the injection device is generally 20 m or more, which is generally long, and 50 m if it is particularly long.
It also becomes. However, these numerical values are, of course, arbitrarily set according to the needs of construction.

With reference to FIG. 4, a method of coping with germination in the injection apparatus of FIG. 1 will be described. When I tried to pull up the wire rope 13 to move the injection point,
It is assumed that the monitor 11 cannot be pulled up due to the occurrence of germing. At this time, if the wire rope 13 is pulled more strongly, a very strong shearing force is applied to the shear pin 22,
It will break at last. When the shear pin 22 is broken, it is shown in FIG.
As shown in FIG. 5, only the packer shaft 14 of the monitor 11 is removed, and both the packers 15 and 17 and the discharge part 16 that are trapped by the manchette tube and do not move are left and collected together with the two hoses 12a and 12b. The strength of the sheer pin 22 can be selected to be sufficiently weaker than the tensile strength and the connection strength of the wire rope 13 and sufficiently strong to withstand a normal insertion / removal operation.

A method for injecting a chemical liquid using the injection device according to the present invention will be described with reference to FIG. At both bases of the hose and the wire rope of the injection device, a device for chemical liquid injection control, packer pressure control, monitor position control and the like are installed together with a winding device such as a reel.

First, it is assumed that the Manchette tube is previously built by the conventional method. The injection device 10 according to the present invention is inserted therein. When moving the injection device 10, pressure is not applied to both packers 31, 36, that is, in a contracted state. The injection device 10 is moved by pushing in and pulling up the wire rope 13. After being inserted to a predetermined position in the manchette tube, the pressurized water 61 is poured into the packer hose 12a. As a result, as shown in FIG. 5, both packers 31, 36 are
It is inflated due to the pressure applied to it and comes into close contact with the Manchette tube. Then, the chemical solution 62 is added to the chemical solution hose 12b.
When is injected, the slit of the check rubber 43 is pushed open from the discharge port 42, and the chemical liquid is discharged to the outside of the monitor. The space between the monitor 11 and the Manchette tube is both packers 3.
Since the tip and the base are shielded by Nos. 1 and 36, the chemical solution is jetted into the ground through the jet port of the Manchette tube. When the injection at this position is completed, the wire rope 13 is pulled up and the monitor 11 is set at the next injection point. The movement distance at this time is controlled based on the movement distance of the wire rope 13 detected by an optical sensor or the like on the ground. In the embodiment, the distance between the injection points is 333 mm, but it can be controlled with an accuracy of 1 mm.

The present invention can be implemented by a structure in which two hoses are symmetrically arranged with respect to one wire.
It is preferable because it has a well-balanced and stable feeling. However, it is also possible to configure with one double pipe hose and one wire. Also, a plurality of wires may be arranged.

[0029]

Since the present invention is constructed as described above, it has the following effects.

First, when the tip cap is attached to the packer shaft by the shear pin, the pin is broken by pulling the wire rope strongly when the jamming occurs. As a result, the packer shaft is not fixed to both the packer section and the discharge section. The packer shaft can be collected together with the two hoses while leaving both the packer section and the discharge section in the ground. The packer shaft and the hose thus collected are not damaged and can be reused. Therefore, the consumption of these parts is reduced,
The cost can be reduced. Further, since it is possible to immediately deal with germing by a simple method, time loss can be reduced.

Next, by connecting a wire rope to the monitor, pushing in and pulling up with this wire rope,
Allows smooth insertion / removal of the monitor into / from the manchette tube.

Further, by using the wire rope, since the force is not applied to the hose during the insertion / removal operation, there is no fear of deformation (stretching etc.) or damage of the hose, and the consumption of the hose can be markedly reduced. it can.

Further, by controlling the monitor position based on the moving distance of the wire rope, very accurate control of the monitor position can be realized without causing an error due to extension in the case of the hose.

Further, the monitor and the hose can be easily separated, and the monitor can also be disassembled into independent parts of the packer shaft, the packer part, and the discharge part simply by removing the tip cap. It is also easy to reassemble. Therefore, unlike the case where the entire monitor is integrated, only the defective portion can be replaced and cleaning is easy.

In addition, without using a double tube hose,
When a book hose is used, the structure of the connecting portion is simplified, so that it is less likely to be damaged and the connecting work is easy. Therefore, superior durability and reliability can be obtained as compared with the double pipe.

As described above, according to the present invention, an excellent hose type chemical liquid injector is provided in the ground improvement by the one-shot injection method.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a one-shot injection type hose type liquid injector according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the tip cap portion of FIG.

FIG. 3 is a top view of the monitor of FIG.

4 is a diagram showing a coping method at the time of germing by the injection device of FIG.

5 is a vertical cross-sectional view of the injection device of FIG. 1 during packer operation.

[Description of sign]

 10 Injection Device 11 Monitor 12a Hose (for Packer) 12b Hose (for Chemical Solution) 13 Wire Rope 14 Packer Shaft 15 First Packer Part 16 Discharge Part 17 Second Packer Part 18a Flow Path (for Packer) 18b Flow Path (for Chemical Solution) 21 Tip Cap 22 Shear Pin 26 Branch (For 1st Packer) 27 Branch (For 2nd Packer) 28 Branch (For Chemical Solution) 31 1st Packer 36 2nd Packer 42 Discharge Port 43 Check Rubber 50 Monitor Head 51 Hose Mounting Screw Hole 53 Rope socket 61 Pressurized water 62 Chemical liquid

Claims (5)

[Claims] 1. A cylindrical first packer portion, a discharge portion, and a second packer portion are sequentially fitted into a packer shaft having two flow paths in the axial direction to form a ring, and a tip cap is further provided on the packer shaft. By attaching to the tip of the shaft, the above-mentioned respective parts are fixed, the both packer parts each have a packer that expands and contracts by a pressure fluid made of an elastic body, and the discharge part has a support pipe and a pipe wall of the support pipe. And a double packer monitor having a branch communicating with both packers and one of the two flow paths having a branch communicating with the discharge port, A hose-type chemical injection device comprising a hose connected to the head of the monitor and connected to two flow paths of the monitor, and at least one wire rope connected to the head of the monitor. 2. The hose-type chemical injection device according to claim 1, wherein the tip cap is attached to the tip of the packer shaft by a shear pin. 3. The hose-type chemical liquid injector according to claim 1, wherein the hose comprises two single-tube hoses. 4. A first packer portion, a discharge portion, and a second packer portion each having a tubular shape are sequentially fitted into a packer shaft having two flow paths in an axial direction, and are annularly provided. Further, a tip cap is provided on the packer shaft. The above-mentioned respective parts are fixed by being attached to the tip of the shaft, and a packer made of an elastic body is provided in both packer parts to expand and contract the packer with a pressure fluid, and the support part and the pipe wall of the support pipe are attached to the discharge part. A double packer monitor is constructed by providing a penetrating chemical liquid discharge port, and connecting a branch provided on one of the two flow paths to both packers and a branch provided on the other one to the discharge port. By connecting a hose communicating with each of the two flow paths of the monitor to the head of the monitor, further connecting at least one wire rope to the head of the monitor, and pushing in and pulling up the wire rope. Perform insertion and removal operation of the monitor, liquid injection method characterized by controlling the monitor position by measuring the moving distance of the wire rope. 5. When the tip cap is attached to the tip of the packer shaft by a sheer pin, and the monitor cannot be pulled up by a normal pulling operation during germing, the sheer pin is further pulled up by pulling up the wire rope. 5. The method for injecting a chemical liquid according to claim 4, wherein the tip cap and the packer shaft are unfixed, and the wire rope, the packer shaft, and the hose are pulled up and collected.