JPS6255314A - Confluence tube - Google Patents

Abstract

PURPOSE:To prevent the breakage of a confluence tube due to vibration of excavation work by a method in which a confluence inner tube is inserted into a confluence outer tube having connecting screw on its both ends and held by a buffer material to form a confluence tube for injecting chemical grout. CONSTITUTION:A confluence inner tube 28 is inserted into a confluence outer tube 23 having connecting screws 23a and 23b for a composite tube and a bit and held by a rubber valve seat 24 having a liquid-passing hole 24b and an annular valve 26 to form a confluence tube 11 for injecting chemical grout. The tube 11 is connected to the lower part of a composite tube with the screw 23a. While the ground is excavated by a bit connected with the screw 23b, the tube 11 is penetrated to a given depth into soft ground. While the composite tube is pulled out, chemial grout is sent through the outer and inner liquid passages, mixed in the tube 11, and injected into the ground. Since the inner tube 28 is held by the valve seat 24 having buffer action, the breakage of the inner tube 28 due to the vibration to be occurred in excavation can be prevented.

Description

[Detailed description of the invention] The present invention relates to a confluence pipe in a perforating chemical injection device.

Chemical injection method is known as one method of ground improvement.
Many of the overnight injection methods involve drilling a hole in the ground and injecting a co-liquid type chemical solution to harden it. The above construction method has been successfully applied! r3-
/323g No. 1 Publication and Jitsukaisho S Ku'3 / 9.5
``A technique for injecting chemical liquid using a single-rotation drilling tool has been disclosed for the command axis.However, drilling with a rotating drilling tool has a slow drilling speed, and it is extremely difficult to drill into a gravel layer.
In chemical injection construction, the time required to drill holes accounts for a large portion of the construction time, which hinders the progress of construction. On the other hand, for the purpose of shortening the construction period and reducing construction costs, drilling tools have the disadvantages of being unaffected by the condition of the ground.
Percussive rotary drilling tools have come into use because of their dramatically improved drilling efficiency compared to rotary drilling tools. However, the technology for a drilling tool that can transmit impact force and safely and reliably inject chemicals has not been established, and currently drilling and injection of chemicals are performed using separate tools. The reality is that the effectiveness of the work is halved.

This invention can perform drilling and chemical injection in a short time.
Moreover, it is an object of the present invention to provide a confluence tube in a perforated chemical liquid injector that is simple in structure and highly reliable. , an annular valve seat for both buffering and fluid passage having a valve hole inserted tightly into the outer confluence pipe, an annular valve body provided in close contact with the valve seat, and an annular valve seat held by the valve seat and arranged within the outer confluence pipe. A liquid sealing material is provided around the outer circumference of the opening side on one side, a circumferential hole is provided on the outer circumference of the closed side of the other side, and a sleeve is fitted over the circumferential hole to form a check valve. It is characterized by having the following.

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

Fig. 1 shows the drilling or chemical injection state by the drilling device 1, 2 is a hydraulic power unit that generates pressure oil as a power source, and the poom 4 supporting the guide cell 3 is rotatably attached to the hydraulic power unit 2 at one end. However, the other end is rotatably attached to the guide cell 3, so that the guide cell 3 can be directed in any direction by means of a hydraulic sill provided on the boom 4. In addition, a percussion rotary drill 5 is disposed in the guide cell 3 so as to be movable along the guide cell 3, and a percussion rotary drill 5 is provided with a percussion liquid injection drill rod (hereinafter simply referred to as a drill rod) that uses the percussion force and rotational force of the percussion rotary drill 5. ) 6, one end of which can be moved a fixed length only in the axial direction to the percussion rotary drill 5.
It is loosely inserted in this state, and a swivel 8 is connected to the other end. The drill port/socket 6 is a composite pipe for drilling chemical injection (
(hereinafter simply referred to as composite pipe) 9 and a connector 1 for connecting this
0, and a bit 12 is attached to the tip of the drill rod 6 via a confluence pipe 11.

FIG. 1 shows a swivel 8, a composite pipe 9 connected to it, and a merging pipe 11 connected to the other side of the composite pipe 9 via a connector 10.
and a bit 12 attached to its tip, which transmits the striking force and rotational force transmitted to the shank rod 7 to the drill rod 6 composed of a composite pipe 9 and a connecting tool 10. The swivel 8 has an adapter 13 provided with a screw hole 13a for screwing the shank rod 7 on the l side, and an external screw part 13b for connecting the composite pipe 9 on the other side.
and a sleeve 14 fitted onto an adapter 13, and the sleeve 14 has an adapter 1 provided so as to communicate with an internal fluid passage 15 of a composite pipe 9, which will be described later.
The supply port 14a communicates with the internal liquid passage hole 13c of the adapter 13, and the supply port 14a communicates with the external liquid passage hole 13d of the adapter 13, which is provided to communicate with the external liquid passage 16 of the composite tube 9.
4b is provided. 17 is a liquid sealing material provided at the contact area between the adapter 13 and the sleeve 14; 18 is a plurality of stoppers for preventing the sleeve 14 from falling off the adapter 13; and 18 is a groove provided along the outer periphery of the adapter 13. The sleeve 14 is disposed so as to be engaged with the sleeve 14, and is fixed to the sleeve 14 with a fastener such as a bolt.

As shown in FIG. 3 and FIG.
an outer tube 19 with an inner tube, a buffer/liquid-passing separator inserted tightly into the outer tube 19, and an inner tube inserted into the holding hole 20a of the separator 20 and held within the outer tube 19. 21, the inner tube 21 is shorter than the outer tube 19, and a liquid sealing material 22 is provided around both ends thereof. Further, the inner tube 21 itself forms an internal liquid passage 15 , and an external liquid passage 16 is formed between the inner tube 21 and the outer tube 19 . The separator 20 has a holding hole 20a as shown in the figure.
Although a passage α port 20b is provided on the outside of the separator, the separator may also be provided with a holding hole 20'a and a liquid passage groove 20'b like 20'. Swivel 8 the above composite pipe 9
To connect the inner tube 21 to the internal liquid passage hole 13C, the connecting screw portion on one side of the outer tube 19 is engaged with the screw portion 13b provided on the adapter 13 of the swivel 8. 13
The internal liquid passage hole 13C of the adab 1-13 can be connected by inserting it into the internal liquid passage 1 of the composite pipe 9.
5, and the external liquid passage hole 13d of the adapter 13 communicates with the external liquid passage 16 of the composite tube 9.

To connect the merging pipe 11 to the other side of the composite pipe 9, the fifth
The connector 10 shown in FIGS. and 6 is used. The connector 10 has a communicating internal liquid passage 10a communicating with the internal liquid passage 15 of the composite pipe 9 and a communicating external liquid passage 10b communicating with the external liquid passage 16, and is fitted into the inner tube 21. Fitting hole 1
The threaded part 1 (ld) is provided on both sides, and the threaded part 10d on one side is threaded into the connecting threaded part 19a provided on the outer pipe 19 of the composite pipe 9. - When the fitting hole 10C is fitted and connected to the inner tube 21, the internal liquid passage 1
The internal liquid passage 10a communicates with the external liquid passage 16, and the external liquid passage 10b communicates with the external liquid passage 16.

FIG. 7 shows the merging pipe 11, the merging pipe 11 is provided with a threaded part 23a on one side to be threaded into the threaded part IQd of the connector 10,
A confluence outer tube 23 with a threaded part 23b for screwing and attaching the bit 12 on the other side, and a separator 20 that is tightly inserted into the confluence outer v23, and a buffer liquid-conducting annular shape with a holding hole 24a and a valve hole 24b similar to the separator 20. The annular washer 2 is engaged with the valve seat 24 and the engagement portion 23C formed by partially reducing the inner diameter of the outer confluence pipe 23.
5, an annular valve body 26 made of a thin elastic material such as rubber, which is sandwiched between the valve seat 24 and the washer 25, and an annular valve body 26 which is inserted into the holding hole 24a of the valve seat 24 and into the confluence outer pipe 23. arranged,
A liquid sealing material 2T is provided around a groove provided on the outer periphery of the opening side on one side, a circumferential hole 28a is provided on the outer periphery of the closed side on the other side, and a sleeve 29 made of an elastic material such as rubber covers the circumferential hole 28a. The inside of the merging inner tube 28 becomes an internal liquid passage 30, and on the left side of the valve seat 24, an external liquid passage 31 is formed between the merging outer tube 23 and the merging inner tube 28. Also, a merging chamber 32 is formed on the right side. Therefore, screw the threaded part 23a into the threaded part 10d of the connector 10, and insert the merging inner pipe 28 into the fitting hole 10C of the connector 10 to connect. Then, the external liquid passage 31 communicates with the external liquid passage 10b, and the internal liquid passage 30
communicates with the internal liquid passage 1Qa.

Connect the seven composite pipes 9 to the swivel 8 as described above, and
We have described the case where the merging pipe 11 is connected through the merging pipe 11 and the bit 12 is attached to its tip, but if the connector 10 is used, it is possible to connect the composite pipe 9 instead of the merging pipe 11, and it is possible to connect multiple pipes. It goes without saying that it is possible to connect two composite pipes using a connector 10, connect a merging pipe 11 to the tip thereof via the connector 10, and then attach a bit 12.

Next, drilling and chemical injection using the drilling device 1 will be explained.

After installing the guide cell 3 in a predetermined direction in FIG. 12 is pressed against the ground and the pressure oil generated by the hydraulic power uni-soto 2 is supplied to the percussion rotary drill 5, a percussion force and rotational force are generated, and drilling is started. The holes are drilled while supplying water from either or both of the supply ports 14a and 14b provided in the sleeve 14 of the sharpening swivel 8. The impact force and rotational force generated by the impact rotary drill 5 are transferred from the shank rod 7 to the adapter 13 of the swivel 8.
Furthermore, the outer pipe 19 of the composite pipe 9, the connector 10, and the merging pipe 11
It is transmitted to the bit 12 via the merging outer pipe 23 and drills into the ground. When the percussion rotary drill 5 reaches the tip of the guide cell 3 during drilling, remove the connection between the swivel 8 and the composite pipe 9, move the percussion rotary drill 5 backward, and insert the lower part between the swivel 8 and the composite pipe 9. Another composite pipe 9 with a fitting 10 connected to
Connect and start drilling again. After repeating the above operations and completing the drilling of the predetermined length, the supply port 14a of the swivel 8
, 14b separately feeds 2fL, the supply port 14a
The chemical solution supplied from the internal liquid passage hole 13 of the adapter 13
Pass through the internal liquid passage 15 of the C1 composite pipe 9, the communicating internal liquid passage 10a of the connector 10, and the internal liquid passage 30 of the merging pipe 11, and push it up against the sleeve 29 from the peripheral hole 28a of the merging inner f2B. The chemical liquid is discharged into the confluence chamber 32 and supplied from the supply port 14b through the external liquid passage hole 13d of the adapter 13, the external liquid passage 16 of the composite tube 9, the communicating external liquid passage 10b of the connector 10, and the confluence pipe 11. The valve seat 24 passes through the external liquid passage 31.
The water is discharged from the valve hole 24b into the merging chamber 32 against the valve body 26, and is then merged and injected into the ground from the discharge hole 33 provided in the bit 12. When injecting the liquid, there are cases in which a predetermined amount is injected while rotating the bit 12 while the position is fixed, and then the bit 12 of a certain length is pulled up and injected again, and cases in which the liquid is injected while rotating and pulling up the bit 12. There is. In addition, it is common to drill holes while supplying water.
In some cases, the drug solution may be injected while drilling the hole. In addition, when injecting the chemical solution while pulling up Bi-Soto 12.

The chemical solution is injected while moving the percussion rotary drill 5 backward along the guide cell 3. When the percussion rotary drill 5 reaches the end of the guide cell 3, the compound pipe 9 connected to the S・F bell 8 is injected.
The connecting tool 10 connected to this is removed, the swivel 8 is moved forward and connected to the lower composite pipe 9, and the drug is injected while pulling up the bit. By repeating the above operations, the prescribed injection is performed.

As described above, drilling and chemical injection using the drilling device 1 have been described, but if the outlet of the discharge hole 33 is arranged in the same direction as the bit 12, the friction with the ground due to the rotation of the bit 12 when the liquid is discharged The liquids are mixed. If it is desired to mix the liquids even better, a line mixer 34 connected to the merging chamber 32 can be installed and removed in the outer merging pipe 23' as shown in Fig. g, instead of the merging pipe 11 shown in Fig. 7. The length of the merging pipe 11' is longer than that of the merging outer pipe 23 (the length of the merging pipe 11' is longer than that of the merging outer pipe 23, except where the line mixer 34 is installed). Since it has the same structure as the tube 11, its explanation will be omitted.Also, the outer tube 1 of the composite tube 9
9 The inner diameters may all be the same, but the intermediate portion may be made smaller in diameter to serve as a locking portion when the separator is closely inserted.

The confluence pipe of the present invention is constructed as described above, and a check valve is provided in each of the co-liquid discharge parts, so that when one liquid is transported due to back pressure due to underground water or a malfunction, the liquid will flow backwards and harden inside the pipe. (The inner confluence pipe is disposed inside the outer confluence pipe via the annular valve seat that also serves as a buffer and liquid passage, and is connected to the connector via the liquid sealing material, so vibrations caused by impact force It does not cause damage due to direct propagation, has a simple structure and is highly reliable, and can be used for percussion rotation drilling, which does not depend too much on the ground condition (drilling and chemical injection can be done in a short time). O has the effect of reducing construction costs and achieving high quality construction.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the state of drilling and drug injection by a perforation device, Fig. 2 is a sectional view of a perforating drug injector/example, Fig. 3 is a sectional view of a composite pipe/reli, and Fig. 3 is an example of two separator FIG. 5 is a cross-sectional view of one example of the connector, FIG. 6 is a cross-sectional view taken along the line A--A, and FIGS. 7 and g are cross-sectional views of two examples of the merging pipe. 10--・Connection tool, 10a-°゛Communicating internal liquid passage, 10
b゛.

Claims (1)

[Claims] A merging outer pipe with threaded portions on both sides, an annular valve seat for both buffering and fluid passage having a valve hole tightly inserted into the merging outer pipe, an annular valve body provided in close contact with the valve seat, and the valve seat. is held in the merging outer pipe, and a liquid sealing material is provided around the outer periphery of one opening side.
1. A confluence tube for perforating chemical liquid injection, comprising a circumferential hole on the outer periphery of the other closed side, and a confluence inner tube having a sleeve fitted over the circumferential hole to form a check valve.