JP2992534B2 - Crack 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 method for injecting cracks into a structure in which cracks are efficiently injected.

[0002]

2. Description of the Related Art Underground structures, such as road tunnels, subway tunnels, and underground passages, are usually constructed below the groundwater level, so that leakage from cracks generated in concrete poses a problem in maintenance and management. First, the present inventors, as one of the repair method for this type of crack,
Japanese Patent Application Nos. 2-102745 and 2-238486 have proposed a two-shot method in which a two-part curable liquid material is injected into a crack portion using a double injection tube.

In the two-shot method, a main agent and a hardening agent pumped by a high-pressure pump such as a plunger pump are made to penetrate into a crack portion of a concrete structure through an injection pipe inserted and fixed into the crack portion. As a device, a set of an injection device is constituted by a pressure feeding unit, an injection tube, and a hose connecting the both. In addition, according to the crack properties,
By adjusting the mixing ratio between the main agent and the curing agent, the gel time is adjusted to various gel times from loose setting to instantaneous setting.

[0004]

As for cracks generated in a structure, the number of cracks to be injected is rarely one, and crack injection is usually performed at a plurality of locations. In this case, if the injection is performed using a plurality of pumping units and a corresponding number of injection pipes, the equipment cost increases and it is not economical. In addition, if one crack injection point was completed using one set of injection devices, and the work proceeded for each crack injection sequentially, such as the next injection point, the injection agent hardened at each point. The pressurized state must be maintained at least for at least the gel time until the operation is completed. During that time, a wait time is required, and the work efficiency is deteriorated.

Therefore, a main object of the present invention is to provide a crack injection method capable of improving the work efficiency when working on a plurality of crack injection locations.

[0006]

According to the present invention, which solves the above-mentioned problems, in a crack injection method for a plurality of crack injection points, a pressure feeding unit for feeding a crack injection agent and a crack injection unit are mounted. An injection pipe, a hose for detachably connecting the injection pipe and the pipe, an on-off valve for opening and closing the injection path of the crack injection agent provided in the injection pipe, and a crack injection agent provided at the injection pipe side end of the hose. Using an injection device equipped with an on-off valve for opening and closing the injection path, preparing a plurality of injection pipes in advance, mounting the injection pipes at the corresponding crack injection sites, and passing the crack injection from the pumping unit through the injection pipes. After injection into the injection site, the on-off valve of the injection pipe and the on-off valve of the hose are closed, and the injection pipe is left at the crack injection site. Remove the hose from the pipe, and then,
This hose is connected to another injection pipe previously attached to another crack injection site, and the on-off valve of the hose is opened to inject the crack injection from the pumping unit into the corresponding injection site through the other injection pipe. This is a crack injection method.

[0007]

In the present invention, an opening / closing valve for opening and closing the injection path of the crack injection agent in the injection pipe is provided, an opening / closing valve is also provided for the hose, and the injection pipe and the hose are detachably configured.

In actual injection work, a plurality of injection pipes are previously mounted on the crack injection site in advance,
For example, using a single pumping unit and a hose, after performing injection by connecting to a certain injection pipe, the two on-off valves are closed, the hose is detached with the injection pipe remaining, and then another injection pipe is used. And hose are connected and injection is performed sequentially.

Therefore, the injection operation can be performed continuously without waiting for the hardening of the injection agent, so that the operation is made more efficient. Since the on-off valve is closed with respect to the injection tube left after the injection is completed at the injection site, the injection tube is maintained at a constant pressurized state without leakage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. An injection device used for crack injection mainly includes a double injection pipe shown in FIG. 1 and a pressure pump shown in FIGS. In FIG. 1, a double injection tube 30 is composed of a concentric outer tube 35 and an inner tube 36, and a sleeve packer 37 made of a flexible material, for example, reinforced rubber is wrapped around the distal end of the outer tube 35. Is being worn. A pusher tube 3 is provided at the base end thereof with a sleeve packer presser 38 interposed therebetween.
9 is loosely fitted. Reference numeral 40 denotes an operating nut screwed to the thread of the outer tube 35 at the base end of the push tube 39;
The sleeve packer is pressed through the push tube 39 or the like by the screwing by rotation. Inside the inner tube 36,
The gap between the inner tube 36 and the outer tube 35 is formed as a passage for the main agent A, and a passage for the curing agent B is formed. Room S
And then discharged from the front end discharge hole.

At the base end of the double injection tube 30, couplers 41 and 42 communicating with the flow paths of the curing agent B and the main agent A are attached, and first stop valves 41a and 42a are provided at an intermediate portion thereof. ing. A second stop valve 44 is provided on the upstream side of the flow path communicating with the coupler 41, and a check valve 45 is provided on the further upstream side of the second stop valve 44. The check valve 45 prevents a backflow from the high-pressure side flow path to the low-pressure side flow path due to the pressure difference when there is a trouble in the liquid supply path and the pressure of the supply liquid is relatively different. . Note that a stop valve and a check valve are similarly provided for the flow path of the liquid A (not shown).

In the double injection pipe 30 constructed as described above, first, at the time of injection, an injection hole h is inserted into the concrete W by a drilling machine at or near the crack C generation site so as to communicate with the crack C. Form. When the double injection pipe 30 is inserted into the injection hole h, the operating nut 4
0 is rotated and screwed in the circumferential direction, the push tube 39 is pushed forward, the sleeve packer 37 is expanded in the circumferential direction via the sleeve packer presser 38, and the expanded outer surface is filled with the injection hole h.
In close contact with the inner surface. Then, if necessary, the auxiliary nut 43
To prevent the operating nut 40 from retreating. As the operating means of the sleeve packer 37, in addition to the above-mentioned screw operation type, a triple pipe is used instead of the double pipe, and the outermost flow path is used as the operating flow path of the packer. It can also be inflated. When installing the double injection pipe 30, a plurality of double injection pipes 30
Are prepared, and the double injection pipes 30,... Are respectively installed at a plurality of locations. The number of the double injection pipes 30 to be prepared does not need to be the same as the number of crack injection target locations, but it is desirable to prepare at least a number that does not hinder the injection work performed sequentially and continuously.

When the work of mounting the double injection pipe 30 is completed by the above procedure, the main agent A and the curing agent B are supplied from the respective flow paths, and mixed in the mixing chamber S at the tip of the outer pipe 35. After that, it is made to penetrate into cracks according to the injection pressure, and is cured to stop water. In the present embodiment, the mixing chamber S is formed inside the outer tube 35. However, the injection hole h is used by using a double injection tube 30 in which each flow path of the injection agent is formed independently up to its tip.
At the time of attachment to the injection hole h, the injection hole h can be attached in a state of being retracted from the bottom, and injection can be performed using the deep portion of the injection hole h as a mixing portion. When the injection in one double injection pipe 30 is completed, the first stop valves 41a and 42a
And a second stop valve 4 corresponding to each of these.
After closing 4, ..., the hose side is disconnected from the couplers 41 and 42 while this double injection pipe 30 is mounted on the injection hole h, and connected to another double injection pipe 30, so that the injection operation is sequentially performed. Done. Then, the double injection pipe 30 is pulled out in order from the injection point where the injection agent has been hardened, and the injection hole h is filled with an appropriate filler.

Next, a pressure feed pump for feeding the main agent A and the hardener B to the double injection pipe 30 will be described in detail with reference to FIGS. FIG. 2 shows a side view of the plunger pump, and FIG. 3 shows a plan view thereof. FIG. 4 is a detailed sectional view of a plunger portion. Reference numeral 1 denotes a push button switch, and 2 denotes a power supply plug. The rotation of the electric motor 6 is transmitted to the reduction gear 8 via the first pulley 6a and the second pulley 8b, and the rotation of the rotation shaft 8a of the reduction gear 8 is further controlled. It is transmitted to the rotating shaft 9a via the belt 7 or the chain. The plungers 17, 17 reciprocate due to the circular motion of the eccentric rotor 9 connected to the rotating shaft 9a, and the infusate sucked from the respective suction couplers 5 of the two plunger pumps P1, P2 is discharged. The ink is discharged from the coupler 4.

As shown in FIG. 5, the first pulley 6a of the electric motor 6 and the second pulley 8b of the speed reducer 8 have three-step grooves, and the belt 79 spans between the pulleys. By changing the groove position, the discharge amount of the plunger pumps P1 and P2 can be changed. As shown in FIG. 6, the pedestal plate 72 on which the electric motor 6 is fixed is supported by support columns 76 and 77. , And is supported by an eye bolt 71 attached to a support column 76 and rotatable about a shaft 75 as a rotation axis. Therefore, the nuts 73 and 7 screwed to the eye bolts
4 is rotated to move forward and backward, thereby tilting the pedestal plate 72 and adjusting the separation distance between the first pulley 6a and the second pulley 8b, so that the belt 79 can be easily replaced and adjusted. You can do it. It is optional to employ an automatic continuously variable transmission in place of the manual transmission.However, when an automatic continuously variable transmission is employed, it becomes heavy in weight and it is difficult to carry in the equipment. May be.

In this embodiment, as shown in FIG. 3, the mounting of the connecting rods 10 of the first plunger pump P1 and the second plunger pump P2 to the eccentric rotor 9 is the same, so Are configured to be the same. Therefore, this 2
The liquids of the main agent A and the curing agent B supplied from the continuous plunger pumps P1 and P2 are simultaneously supplied to the double injection pipe 3.
0 is supplied.

Here, "simultaneously" means that, as described above, the discharge amount of the liquid discharged from the plunger pump fluctuates like a sine curve when viewed over time. as shown in 10, which means that one of the discharge amount Q ₂ of the discharge amount Q _1, the other liquid of the solution, has over time always constant ratio. Therefore, when the stroke of the plunger is the same and the cross-sectional area is set to, for example, a ratio of 3: 1,
Always discharge amount Q _1, discharge amount Q ₂ is over time 3: means in the 1 ratio. Note that the pumping operation of the infusion pump for each liquid may be substantially synchronized, and is not necessarily strictly synchronized. Actually, the phase shift of the pumping operation is within ± 10%, more preferably ± 5%.
If it is within, it is confirmed that there is no problem.

As the two-liquid curing type injection agent, various conventional crack injection agents can be used. Examples thereof include two-component epoxy resins, urethane resins, acrylamide resins, and reactive water glass materials. Further, in order to surely mix and mix the two solutions, the effect is remarkably exhibited when the gel time of the injection is within 60 seconds, preferably within 30 seconds, more preferably within 10 seconds.

As shown in detail in FIG. 4, the plunger portions of the plunger pumps P1 and P2 are connected by a connecting rod 10 and a connecting pin 15 in accordance with the circular motion of the eccentric rotor 9. The plunger 17 reciprocates in the cylinder 21. In addition, 1
Reference numeral 6 denotes a needle bearing for smooth rotation of the connecting portion. An oil cup (or grease cup) 11 is provided on the guide bush 18 on the base end side of the cylinder 21 and the V packing 20 at an intermediate portion thereof in order to forcibly supply a lubricant. The oil cup (or grease cup) 11 is also provided on the connecting pin 15 and the eccentric rotor 9.

In the valve chamber 12 at the tip of the plunger 17, as the plunger 17 retreats, the liquid agent passes through the check valve 25 from the suction coupler 5 at the lower end and the cylinder 21.
When the plunger 17 advances, the inflow-side flow path is closed by the check valve 25, so that the liquid agent is pushed out to the discharge-side flow path, passes through the check valve 24, and flows through the discharge coupler 4. It is fed to the double injection tube 30. As shown in FIG. 7, the attachment and detachment of the suction coupler 5 and the discharge coupler 4 are facilitated in the distal end valve chambers 12, 12 of the two plunger pumps P1, P2 arranged in parallel. A fixing jig 3 is provided. The fixing jig 3 includes an upper flange 27 shown in FIG.
The lower flange 28 shown in FIG. 9 is provided at the lower end, and a long connecting bolt 29 inserted through the through hole of the lower flange 28 is locked to the upper flange 27. , The tightening nut 23 is screwed into the end of the connecting bolt 29, and the grip 29 a is gripped and rotated to screw the tightening nut 23 into the upper and lower flanges 27, 2.
The suction coupler 5 and the discharge coupler 4 are fixed by pressing 8 on the valve chamber 12 side. Upon disassembly, the fastening nut 23 is loosened, the fixing jig 3 is removed, and the suction coupler 5 and the discharge coupler 4 are removed, so that the inside can be easily cleaned. When cleaning the plunger 17, the bolts 19 of the base plate are removed, and the cylinder 21 and the valve chamber 12 are removed.
Can be removed for cleaning.

The injection pump can be applied not only to the plunger pump described above but also to a piston pump. Also, in the plunger or piston, the discharge amount can be made different from each other by changing the length of the stroke, changing the cross-sectional area, or changing both of them.

Next, a concrete example of a portable and mobile crack injecting apparatus to cope with crack repair work in a subway tunnel will be described. FIG. 11 is a side view of the crack injection device, and FIG. 12 is a plan view thereof. In the case of a subway tunnel or the like, the running rail 49
It is preferable from the viewpoint of construction to use a portable moving type, and the first moving vehicle 50 and the second moving vehicle 6 traveling on the traveling rail 49 are used.
0, the third moving vehicle 70 is used. In the first moving vehicle 50,
In addition to the storage tank 51 for the main agent A liquid, the storage tank 52 for the curing agent B liquid, and the water tank 53, a double-tuned plunger pump 5 for simultaneously supplying these liquids A and B to the double injection pipe 30
4, a flow dividing device 55 and a flow meter 56 are mounted. The second moving vehicle 60 is equipped with an A liquid stirring tank 62, a B liquid stirring tank 63, and a water tank 61.
Is equipped with a water tank 71 and the like. These first to third
The mobile vehicles 50, 60, and 70 all move to the crack injection target site and perform crack injection.

[0023]

As described above, according to the present invention, it is possible to improve the work efficiency in performing the work of injecting a plurality of cracks at the injection site.

[Brief description of the drawings]

FIG. 1 is a sectional view of a double injection tube according to the present invention.

FIG. 2 is a side view of a plunger type infusion pump.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a detailed view of a plunger portion of the infusion pump.

FIG. 5 is a view taken along line VV of FIG. 3;

FIG. 6 is a view taken along line VI-VI in FIG. 3;

FIG. 7 is a view taken along line VII-VII of FIG. 2;

FIG. 8 is a plan view of an upper flange.

FIG. 9 is a plan view of a lower flange.

FIG. 10 is a graph showing an example of the change over time of the discharge amount by a plunger.

FIG. 11 is a side view of a portable movable crack injection device.

FIG. 12 is a plan view of FIG.

[Explanation of symbols]

3. Fixing jig, 4. Discharge coupler, 5. Suction coupler,
6 ... Electric motor, 8 ... Reducer, 9 ... Eccentric rotor, 10 ...
Connecting rod, 11 Oil cup, 12 Valve chamber, 13 Crank chamber, 15 Connection pin, 16 Needle bearing, 17 Plunger, 18 Guide bush, 20 V packing, 21 Cylinder, 24
25: check valve, 35: outer tube, 36: inner tube, 37: sleeve packer, 39: push tube, 40: operating nut, 41
42: Coupler, 41a / 42a, 44: Stop valve,
45: check valve, P1: first plunger pump, P2 ...
2nd plunger pump

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Shoichi Kashima 1-10-3 Hiroo, Shibuya-ku, Tokyo Examiner Seiji Koyama (56) References JP-A-4-118467 (JP, A) JP-A-61-277775 (JP, A) JP-A 62-187149 (JP, U) JP-B 5-65672 (JP, B2) JP-B 4-4121 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶⁾ , DB name) E04G 23/02

Claims (1)

(57) [Claims] In a crack injection method for a plurality of crack injection points, a pumping unit for pumping a crack injection agent, an injection pipe attached to the crack site, and a hose for detachably connecting the injection pipe and the pipe. An injection valve provided with an on-off valve for opening and closing a crack injection agent injection path provided in the injection pipe, and an on-off valve for opening and closing a crack injection agent injection path provided at an injection pipe side end of the hose; Using a plurality of injection pipes in advance, mounting the injection pipe at the corresponding crack injection site, and injecting the crack injection from the pumping unit into the injection site through the injection pipe,
The on-off valve of the injection pipe and the on-off valve of the hose are closed, and the hose is detached from the injection pipe while the injection pipe is left at the crack injection site. A crack injecting agent from the pumping unit is injected into the corresponding injection site through the other injection pipe by connecting to another injection pipe attached to the injection pipe and opening an on-off valve of a hose.