JP2002285541A - Packer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packer which facilitates setting thereof, can be manufactured at low cost, and dispenses with a special jig for setting the same. SOLUTION: The packer 1 is mounted on a tube body arranged in a long hole drilled in the natural ground, and comprises a porous cylindrical main body 2 obtained by boring a number of through holes in a peripheral wall thereof, a caulking compound injecting tube 3 spirally wound about a peripheral portion of the porous cylindrical main body 2, a number of caulking compound injecting holes 3a bored in the caulking compound injection tube 3, and a caulking compound absorbing material 4 wound about a peripheral portion of the caulking compound injecting tube 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packer for sealing between a long hole drilled in the ground and a steel pipe and preventing the steel pipe from dropping in a tunnel drilling work or the like.

[0002]

2. Description of the Related Art Conventionally, in the construction of a tunnel in a soft ground, in order to improve the soft ground to a solid ground, various types of solidification using a liquid chemical for consolidation are used. The construction method is adopted. For example, a method of connecting a steel pipe or the like to the ground using a hydraulic jumbo and driving it in, and injecting a consolidation chemical solution from inside the steel pipe or the like, to reinforce the ground in front of the tunnel is performed. I have. In such a construction method or the like, since it is necessary to prevent the chemical liquid for consolidation from leaking from the gap between the cast steel pipe or the like and the sprayed concrete of the tunnel or the ground, a waste and a caulking agent are filled in the gap. I try to pack and coke.

In this method, however, it is necessary to adhere a caulking agent to the entire surface of the gap between the steel pipe or the like and the sprayed concrete or ground. However, depending on how the caulking agent is filled, a gap is generated, and a reliable caulking effect is obtained. Not been. Further, since the waste, the caulking agent, and the waste are sequentially packed using a jig, much time is required for caulking. Further, since the caulking agent and the waste are mixed, it is difficult for the caulking agent to fill the gap between the drilled hole and the steel pipe or the like. Therefore, the present inventor has proposed a method in which a packer is set in a terminal pipe such as a steel pipe using a dedicated jig, and a caulking agent is injected into the packer to caulk the gap (Japanese Patent Application No. 2000-217868). ).

That is, in this method, a packer 32 as shown in FIG. 6 is used, and the packer 32 is set in a terminal pipe 31 such as a steel pipe cast in a ground (not shown). The packer 32 is provided with a passage 3 for caulking agent injection.
4 and a nut 35 disposed on the outer peripheral portion of the cylindrical member 33 in order from one end thereof (the nut 35 is a screw formed on the outer peripheral surface of the cylindrical member 33). Part 3
3a), slide ring 3
6, a first rubber annular body 37a, a cylindrical spacer 38 having a through hole 38a formed therein, and a second rubber annular body 37
The protrusion 33 b is provided on the outer peripheral surface of the other end of the cylindrical body 33. Further, the flow path 34 is
One end of the opening is opened at one end of the cylindrical body 33, and the other end is opened at the outer peripheral surface of the cylindrical body 33 corresponding to the through hole 38 a of the cylindrical spacer 38. In the drawing, reference numeral 31a denotes a number of through holes formed in the terminal tube 31, and reference numeral 39 denotes a joint attached to one end opening of the flow path.

[0005] As shown in FIG. 7, the exclusive jig 41 is constituted by a double pipe composed of a small-diameter cylinder 42 and a large-diameter cylinder 43. An engagement portion 44 is formed at the distal end to engage with the projection 33c (see FIG. 6) of the tubular body 33 to prevent rotation of the tubular body 33 and movement of the terminal tube 31 in the longitudinal direction. I have. The large-diameter cylindrical body 43 has an engaging portion 45 formed at the distal end thereof for engaging the concave portion 35a of the nut 35 (see FIG. 6) to rotate the nut 35. In the figure, reference numeral 46 denotes a pair of handle bars for rotating the small-diameter cylinder 42, and reference numeral 47 denotes a pair of handle bars for rotating the large-diameter cylinder 43.

In the above construction, the ridge 33 of the cylindrical body 33 is provided.
The packer 32 is disposed at the mouth of the terminal tube 31 such that the position “b” is located on the back side of the terminal tube 31. Next, using the dedicated jig 41, the handlebars 46 and 47 are flipped to tighten the nut 35 while preventing the rotation of the tubular body 33 and the movement of the terminal tube 31 in the longitudinal direction. As a result, both rubber annular members 37 disposed on the outer peripheral portion of the cylindrical body 33 are formed.
The a and 37b are pressed against the cylindrical spacer 38 and the ridge 33b and are projected and deformed outward, and come into close contact with the inner peripheral surface of the terminal tube 31 (see FIG. 8), and are set in the terminal tube 31. Next, a caulking agent is injected from a caulking agent injector (not shown) into the joint 39 by a tube 48 (see FIG. 6).
Inject through. By this injection, the caulking agent
After being discharged to the outer peripheral portion of the cylindrical spacer 38 through the flow path 34 of the cylindrical body 33 and the through hole 38a of the cylindrical spacer 38, it is discharged from the many through holes 31a of the terminal pipe 31, and It fills the gaps between the mountains and hardens.
Due to this curing, the gap between the terminal tube 31 and the ground is coked, and the terminal tube 31 is prevented from falling.

[0007]

However, in the above method, the exclusive jig 41 is made of steel and weighs 10 kg.
/ There is also a stand, the length is as long as 1 m or more, and there is an insert pipe etc. for injecting a consolidation chemical etc. for ground improvement into the terminal pipe 31 when the packer 32 is inserted, so the packer at a predetermined position Setting 32 is difficult. Moreover, after the caulking agent is discharged from the packer 32 set in the terminal tube 31, a large number of through holes 31 formed in the terminal tube 31 are formed.
a, and fills the gap between the terminal pipe 31 and the ground.
It is necessary to drill 1a, which increases the cost. Moreover,
The dedicated jig 41 needs to have a length that reaches the position where the large number of through holes 31a are formed.
It is necessary to strongly rotate the nut 35 while fixing the cylindrical body 33, so that a predetermined length, a non-buffering shape and strength are required.

The present invention has been made in view of such circumstances, and provides a packer which is easy to set, can reduce the cost, and does not require a special jig for setting the packer. With that purpose.

[0009]

In order to achieve the above object, a packer according to the present invention is a packer which is mounted outside a pipe disposed in a long hole of a ground, and has a plurality of penetrating holes formed in a peripheral wall. A cylindrical main body having a hole formed therein, a chemical liquid injection tube spirally wound around the outer peripheral portion of the cylindrical main body, a large number of chemical liquid discharge ports formed in the chemical liquid injection tube, A chemical liquid absorbing material wound around the outer periphery of the chemical liquid injection tube is provided.

[0010] That is, the packer of the present invention is a packer which is mounted outside a pipe provided in a long hole of the ground,
A cylindrical main body having a large number of through holes formed in a peripheral wall thereof, a chemical liquid injection tube spirally wound around the outer periphery of the cylindrical main body, and a large number of chemical liquids drilled in the chemical liquid injection tube; It has a discharge port, and a chemical absorbing member wound around the outer periphery of the chemical injection tube. Such a packer of the present invention can be set outside a tubular body such as a terminal tube as follows, for example. First, a chemical supply hose or the like is connected to a chemical injection tube spirally wound around the outer periphery of the tubular main body of the packer. Next, the packer is manually operated and inserted into the tubular body so as to be fitted into the tubular body, and set at a predetermined position of the elongated hole (for example, a hole provided in a shot concrete of a tunnel). Next, a chemical solution such as a caulking agent is supplied from a chemical solution supply device to a chemical solution injection tube via a chemical solution supply hose or the like, and is discharged from a number of chemical solution discharge ports provided in the chemical solution injection tube to form a chemical solution absorbing material. Soak and cure. Due to this curing, a gap between the predetermined position of the long hole and the packer is coked. Further, the chemical solution discharged from the chemical solution discharge port is passed through a number of through holes of the cylindrical main body to the inside of the packer (that is, the gap between the tube and the packer).
And allowed to cure. By this hardening, the gap between the tube and the packer is coked, and the hardening prevents the tube from falling. In the present invention, "a long hole in the ground" means, when providing a long hole in the ground,
When a hole is provided in the shotcrete of the tunnel, it means that the hole is included.

As described above, the packer of the present invention does not use the special jig 41 which is very heavy and long as in the conventional example, and the packer is mounted outside the pipe. The packer can be easily set in the position. In addition, since the packer is mounted outside the tube, it is not necessary to form a large number of through holes in the process of manufacturing the tube, so that the cost can be reduced. Moreover, as described above, since the dedicated jig 41 is not used, it is not necessary to manufacture it.

In the present invention, when the tubular main body is mounted on an outer peripheral portion of a portion of the tubular body corresponding to the concrete to be sprayed in the tunnel, a packer is provided by utilizing a hole provided in the concrete to be sprayed in the tunnel. Can be set, and the packer can be easily set simply by stretching the fingers.

Next, the present invention will be described in detail.

The packer of the present invention comprises a cylindrical main body, a tube for injecting a drug solution having a plurality of drug solution outlets, and a drug absorber.

The material of the cylindrical body is not particularly limited, and various materials such as metal, resin, and paper can be used.

The material of the tube for injecting a drug solution is not particularly limited, but is preferably made of resin.

The material of the chemical solution absorbent is not particularly limited, but various materials such as chemical fiber, animal fiber, pulp fiber and the like are used. Also, a nonwoven fabric, a raised cloth, or the like formed in a sheet shape can be used. Further, as the raised cloth, a double-sided raised cloth or the like is suitable, and in the case of a woven cloth, the strength is increased. Further, when a urethane foam-based chemical is used as the chemical, it is preferable to use a polyester-based material that is well compatible with this.

[0018] A protective cover formed in a sheet shape may be wound around the outer periphery of the chemical solution absorbent. The material of this protective cover is not particularly restricted,
It may be a bag shaped enough to allow water and chemicals to pass through. In addition, fixing of the chemical solution absorbent material and the protective cover wound around the cylindrical main body,
It is sufficient that both sides are fixed with tape or the like.

As the chemical supplied to the tube for injecting a chemical, a two-component mixed urethane foamed chemical, an inorganic / organic mixed foamed type chemical, and the like are preferably used. A chemical solution is used. In this case, since the foam is absorbed by the chemical liquid absorbent and then foamed, it is easy to caulk the gap between the ground (for example, the sprayed concrete of the tunnel) and the packer and the gap between the packer and the pipe.

The gap between the shot concrete and the packer in the tunnel is usually about 5 to 20 mm. Also,
The gap between the packer and the tube (for example, terminal tube) is 1 to 1
It is set to about 0 mm, and preferably set to about 2 to 5 mm. When it is 10 mm or more, the chemical liquid easily leaks from the gap, and when it is 1 mm or less, the chemical liquid hardly flows into the gap. Further, in order to prevent or prevent the chemical solution from leaking from the gap, both ends of the cylindrical main body are formed by bending inward, the cylindrical main body is formed into a drum shape, and both ends of the cylindrical main body are formed. A tape or the like may be attached to the portion to close the gap. Moreover, you may stick the said chemical | medical solution absorber on the inner peripheral part of the said cylindrical main body.

[0021]

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show one embodiment of the packer of the present invention. In these figures, reference numeral 1 denotes a packer (total length of about 10 to 30 cm), which is a resin-made porous cylindrical main body 2 formed in a cylindrical shape (see FIGS. 3 and 4).
And a caulking agent injection tube (tube for chemical solution injection) 3 spirally wound around the outer peripheral surface of the porous cylindrical main body 2.
And a sheet-like caulking agent absorbent (chemical solution absorbent) 4 wound around the outer periphery of the caulking agent injection tube 3 wound spirally, and a sheet-like wound around the outer periphery of the caulking agent absorber 4 The protective cover 5 includes a pair of tapes or other fixing means 6 for fixing the protective cover 5 by wrapping the protective cover 5 on both sides.

As shown in FIG. 3, the porous cylindrical main body 2 has a large number of through holes 2a (only six are shown in FIG. 3) in the peripheral wall. The inner diameter of 2 is formed slightly larger than the outer diameter of the terminal tube 12 (see FIG. 5). As shown in FIG. 1, the caulking agent injection tube 3 has a large number of caulking agent discharge holes 3a (only 16 are shown in FIG. 1).
Further, in the caulking agent injection tube 3, a stationary mixer 7 for stirring the caulking agent is built in a portion not wound around the porous cylindrical main body 2 (see FIG. 2). Further, the caulking agent absorbent 4 is formed of a sheet-like nonwoven fabric, and the protective cover 5 is formed of a tubular gauze.

Such a packer 1 is set between a hole 11a (see FIG. 5) formed in the shotcrete 11 of the tunnel and an outer peripheral portion of a mouth portion of the terminal pipe 12. The terminal tube 12 is used for an injection-type long precedent receiving method called an AFG method, and is usually 4 inches in size.

Using the above-mentioned packer 1, the ground can be consolidated as follows. That is, first, ground mountain 1
At 0 (see FIG. 5), a pipe body such as a steel pipe (only the terminal pipe 12 is shown in FIG. 5) is connected and placed using a hydraulic jumbo (not shown). At this time, a long hole 10 drilled in the ground 10 is formed in the sprayed concrete 11 of the tunnel.
A hole 11a having a diameter slightly larger than a is formed. Then, with the caulking agent injection tube 3 facing the near side, the packer 1 is inserted into the terminal tube 12 so as to fit over the terminal tube 12, pushed into the terminal tube 12 with the fingers, and set in the hole 11 a of the sprayed concrete 11. . Next, a caulking agent injection hose or the like (not shown) is connected to the caulking agent injection tube 3 of the porous tubular main body 2 of the packer 1. Further, into the terminal pipe 12, an insert pipe 13 to which a chemical liquid injection tube or the like (not shown) for solidification for ground improvement is attached is also fed.

Next, the caulking agent injection machine is driven,
A caulking agent is supplied to the caulking agent injection tube 3 via a caulking agent injection hose or the like. (Specifically, the two-component mixed type urethane foam liquids A and B separately fed by the caulking agent injection machine are coked. Are joined by the agent injection tube 3). As a result of this injection, the caulking agent (two-component mixed type urethane chemical solution) passes through the static mixer 7 of the caulking agent injection tube 3 and is then discharged from the caulking agent discharge hole 3 a of the caulking agent injection tube 3, and is discharged to the caulking agent absorber 4. Soaks, where it foams and hardens. Due to this curing, a gap between the hole 11a of the sprayed concrete 11 and the packer 1 is caulked. The caulking agent discharged from the caulking agent discharge hole 3a flows into the gap between the packer 1 and the terminal tube 12 through the through hole 2a of the porous tubular main body 2, where it foams and hardens. Due to this curing, the gap between the packer 1 and the terminal tube 12 is coked, and the both ends of the curing prevent the terminal tube 12 from falling.

As described above, in this embodiment, the work of setting the packer 1 is very simple, and the packer 1 can be set quickly. Further, unlike the conventional example, there is no need to form a large number of through holes in the terminal tube 12 or to manufacture the dedicated jig 41.

[0028]

As described above, according to the packer of the present invention, a very heavy and long dedicated jig as in the conventional example is not used, and the packer is mounted outside the pipe. The packer can be easily set at a predetermined position. Also, since the packer is attached outside the tube,
There is no need to drill a large number of through holes in the manufacturing process of the tube,
Costs can be kept low. Moreover, as described above, since no dedicated jig is used, there is no need to manufacture it.

In the present invention, when the tubular main body is mounted on the outer peripheral portion of the portion of the pipe corresponding to the concrete to be sprayed in the tunnel, the packer is provided by utilizing the holes provided in the concrete to be sprayed in the tunnel. Can be set, and the packer can be easily set simply by stretching the fingers.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a packer according to the present invention.

FIG. 2 is a sectional view of the packer.

FIG. 3 is a sectional view of a perforated cylindrical main body.

FIG. 4 is a side view of the perforated tubular main body.

FIG. 5 is an explanatory diagram showing a use state of the packer.

FIG. 6 is a sectional view showing a conventional packer.

FIG. 7 is a perspective view showing a dedicated jig.

FIG. 8 is a sectional view showing the operation of a conventional packer.

[Description of Signs] 1 Packer 2 Porous cylindrical main body 3 Caulking agent injection tube 3a Caulking agent discharge hole 4 Caulking agent absorbing material

Claims (2)

[Claims] 1. A packer mounted outside a pipe disposed in a long hole of a ground, comprising: a tubular body having a plurality of through holes formed in a peripheral wall; and an outer peripheral portion of the tubular body. A liquid medicine injection tube spirally wound around, a number of liquid medicine discharge ports formed in the liquid medicine injection tube, and a liquid medicine absorbing material wound around an outer peripheral portion of the liquid medicine injection tube. A packer characterized by being. 2. The packer according to claim 1, wherein said tubular main body is mounted on an outer peripheral portion of a portion of said tube corresponding to a shot concrete of a tunnel.