JP3030323B2 - 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 crack injection method for injecting a two-part curable material by using an injection pump whose discharge flow rate changes with time for repairing water leakage from a structural crack. About.

[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,
In Japanese Patent Application Nos. 2-102745 and 2-238486, a two-shot method in which a two-part curable liquid material is injected into a crack portion using a double injection tube was developed.

[0003] In this case, for example, it is general that each liquid of the main agent and the curing agent is pumped into the double injection pipe by a plunger pump, a piston pump or the like.

[0004] By the way, some actual cracks at the site are leaking and some are not. When pouring into a leaking crack, the water cannot be stopped unless the gel time is short (flash type). For cracks that have not leaked, those with relatively long gel times (slow and long type) are more suitable. To respond to this in the field, use two or three types of materials (for example,
(Slow connection type, long connection type).

However, if the gel time can be changed by adjusting the mixing ratio of the base material and the hardening material with one material, workability and economic efficiency are improved. Therefore, in order to adjust the gel time by adjusting the mixing ratio of the base material and the hardening material with one material, an injection pump whose discharge flow rate changes with time is required.

In addition, in the case of injection work on site, crack widths are various, and the injection amount of the injection agent to be injected into these must always be changed on site. For example, only a small amount of an injectant can be injected into a small crack having a small crack width.
The trick to safe and perfect injection is to inject a little more at the beginning of the injection and a little more at the end of the injection while watching the surroundings. Such an operation cannot be dealt with unless an infusion pump can change the discharge flow rate over time.

[0007] Incidentally, the mixing ratio is the main agent: curing agent = 1:
In the case of 1, if the cross-sectional area of the piston is changed to 1: 1 for the main agent and the hardener, and the pumping operation of the main agent and the hardener is synchronized, and the stroke length of the piston is changed with time, the mixing ratio becomes the main agent: the hardener. The injection can be performed by changing the injection amount of the injection agent of agent = 1: 1 with time. Furthermore, the mixing ratio is based on: main agent: curing agent =
In the case of 2: 1, the cross-sectional area of the piston is calculated as follows: main agent: hardener = 2:
By changing the stroke length of the piston over time by synchronizing the pumping operation of the main agent and the hardener to 1 and changing the injection amount of the injection agent with the mixing ratio of the main agent: hardener = 2: 1 over time Let it be injected.

[0008]

In such a two-shot injection method, by adjusting the mixing ratio of the base material and the curing agent, it is possible to obtain a curing liquid having various gel times from loosening to instantaneous setting. In particular, an injection having a short gel time can be used for stopping water, which is extremely useful.

However, in the conventional two-liquid pumping method,
Although the main agent (Solution A) and the curing agent (Solution B) are simultaneously supplied macroscopically, in practice, AB
-AB ... are supplied to the merging / mixing section. That is, in the process of discharging the main agent, the hardener is sucked into the plunger chamber, and then, in the process of sucking the main agent into the plunger chamber, the hardener is discharged. It is an alternating injection,
Actually, according to an on-site experiment, a low-strength portion was observed in the obtained consolidated body, where the injection liquid did not seem to have partially reacted. This is considered to be due to the fact that the main agent was injected without reacting with the curing agent.

Therefore, conventionally, pulsation has been devised to reduce the pulsation as much as possible by adopting a multiple system and shifting the phase of the discharge operation. However, pulsation still exists.
It was not a fundamental solution.

[0011] Accordingly, a main object of the present invention is to reliably carry out a combined mixing reaction of two liquids without causing unreaction when cracks are injected using a two-liquid curable material.

[0012]

The object of the present invention is to form an injection hole by drilling a hole from the front surface without penetrating a member at a crack generating portion of a structure, and then comprising an inner tube and an outer tube. With the crack injection pipe inserted into the injection hole, each liquid of the main agent and the curing agent is pumped by an injection pump whose discharge flow rate changes with time, and a mixing section or the injection hole formed inside the crack injection pipe is provided. In the mixing part formed by the injection pipe tip and crack in the deep part, the two liquids are mixed,
The problem can be solved by injecting into the cracks, substantially synchronizing the pumping operation of the infusion pump with respect to each of the liquids, and maintaining a substantially constant flow rate ratio of each of the liquids flowing into the mixing section with time.

[0013] The pumping operation can be performed by a plunger or piston corresponding to each liquid, and in this case, it can be achieved by substantially synchronizing the discharge operation of each plunger or piston. Further, when the cross-sectional area of at least one set of plungers or pistons is different, the effect of the present invention is remarkably exhibited. In the crack injection in the method of the present invention, when the gel time of the injection is 60 seconds or less, the effect of the present invention is remarkably exhibited.

[0014]

In the present invention, the respective liquids are surely merged and mixed, and are not injected in an unreacted state. According to the present invention, the pumping operation of each liquid of the infusion pump is synchronized, and the liquid is caused to flow into the junction while maintaining the instantaneous discharge amount of each liquid at a constant ratio. There is no excess or shortage of the main ingredient. As a result, a change in gel time can be suppressed, and the strength and strength of the consolidated body can be stabilized and improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. The crack injection device according to the method of the present invention mainly comprises a double injection tube shown in FIG. 1 and a pumping device 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. At the base end thereof, a push tube 39 is inserted with a sleeve packer presser 38 interposed therebetween.
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 pipe 30, couplers 41 and 42 communicating with the flow path 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 configured as described above, first, at the time of injection, an injection hole h is formed in 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. According to the above procedure, when the mounting work of the double injection pipe 30 is completed, the main agent A and the curing agent B are supplied from the respective flow paths,
After mixing in the mixing chamber S at the front end in the outer tube 35, the mixture is permeated into cracks according to the injection pressure, hardened, and water is stopped.
In the present embodiment, the mixing chamber S is formed inside the outer tube 35. However, when the injection chamber h is attached to the injection hole h, the double injection pipe 30 in which each flow path of the injection agent is independently formed up to the tip thereof is used. Is mounted in a state of being retracted from the bottom of the injection hole h,
The injection may be performed using the deep portion of the injection hole h as a mixing portion. When the injection operation is completed, double injection tube 3
0 is drawn out, and the injection hole h is filled with an appropriate filler.

As the operating means of the sleeve packer 37, in addition to the above-mentioned screw-operated type, a triple pipe is used in place of the double pipe, and the outermost flow path is used as the working flow path of the packer. The packer 37 can also be inflated. 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. In addition, in the method of the present invention, 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, in order to surely mix and mix the two liquids.

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. 1 is a push button type switch, 2 is a power supply insertion, the rotation of the electric motor 6 is transmitted to the speed reducer 8 via the first pulley 6a and the second pulley 8b, and further the rotation of the rotation shaft 8a of the speed reducer 8 It is transmitted to the rotating shaft 9a via the belt 7 or the chain. The plungers 17, 17 reciprocate by the circular motion of the eccentric rotor 9 connected to the rotating shaft 9a, and the respective inlets 5 of the two plunger pumps P1, P2.
The injection liquid sucked from the outlet is discharged from the discharge port 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. 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 via an eyebolt 71 attached to a support column 76 and rotatable about a shaft 75 as a rotation axis. Therefore, the nut 7 screwed into the eye bolt 71
The pedestal plate 72 is tilted by rotating the 3, 74 to move forward and backward, thereby adjusting the separation distance between the first pulley 6a and the second pulley 8b. This allows the belt 79 to be easily replaced and adjusted. 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 the present invention, 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 that the forward / reverse timing is adjusted. It is 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 the discharge amount of the liquid discharged from the plunger pump fluctuates like a sine curve over time, as described above. 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. In the present invention, the pumping operation of the infusion pump for each liquid may be substantially synchronized,
It is not always necessary to tune exactly. Actually, it has been confirmed that there is no problem if the phase shift of the pumping operation is within ± 10%, more preferably within ± 5%.

As shown in detail in FIG. 4, the plunger portions of the plunger pumps P1 and P2 are connected to a connecting rod 10 and a connecting pin 15 with the circular movement 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. The guide bush 18 on the base end side of the cylinder 21 and the V-packing 20 at an intermediate portion thereof are provided with an oil bath 11 for constantly forcibly supplying lubricating grease. The oil bath 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, the liquid agent flows from the suction flange 26 at the lower end through the check valve 25 into the cylinder 21 as the plunger 17 retreats, and the plunger 17 advances. While the inflow-side flow path is closed by the check valve 25, the liquid agent is pushed out to the discharge-side flow path, passes through the check valve 24 and the discharge flange 22, and is supplied to the double injection pipe 30. . The tip end valve chambers 12 of the two series of plunger pumps P1, P2 arranged in parallel,
As shown in FIG. 7, 12 is connected and fixed by a fixing jig 3 which can be removed for disassembly and cleaning. The upper flange 27 shown in FIG. 8 is provided at the upper end of the valve chamber 12, and the lower flange 28 shown in FIG. 9 is provided at the lower end, and the lower flange 28 is inserted through the through hole. The long connecting bolt 29 is locked to the upper flange 27, and the tightening nut 23 is screwed by grasping and rotating the grip at the tip of the connecting bolt, and the valve chambers 12, 12 are moved by the two flanges 27, 28. It is fixed so as to be clamped. Upon disassembly, the tightening nut 23 is loosened, the bolts 12a, 12a of the base plate at the base end of the valve chamber are removed, and the valve chamber 12 is removed for cleaning.

The injection pump of the present invention can be applied to a piston pump, a squeeze pump, and the like in addition to the plunger pump whose discharge flow rate changes with time. 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 will be described in order to cope with crack repair work in a subway tunnel. 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 movable type, for example, as shown in FIG. 9, a first movable vehicle 50, a second movable vehicle 60, and a third movable vehicle 70 traveling on the traveling rail 49.
Use The first moving vehicle 50 has a storage tank 5 for the main agent A liquid.
1. In addition to the storage tank 52 and the water tank 53 for the curing agent B liquid, a double tuned plunger pump 54, a flow dividing device 55 for simultaneously supplying these liquids A and B to the double injection pipe 30, and A flow meter 56 is mounted. The second mobile vehicle 6
0, the A liquid stirring tank 62, the B liquid stirring tank 63 and the water tank 6
The third mobile vehicle 70 is provided with a water tank 71 and the like. These first to third moving vehicles 50, 60, 70
Move together to the crack injection target site and perform crack injection.

[Example] Leakage point of road tunnel (water leakage amount: 5 to 10 liters /
min), cracks were injected under the conditions shown in Table 1. The test was conducted by changing the concentration of the liquid B while maintaining the amount of the liquid A + liquid B at 2 liters / min, in the case of alternate operation in which the discharge operation of the plunger is different, and in the case of synchronizing the discharge operation according to the present invention. , The gel time and water stoppage were investigated. The gel time was measured 5 times for 20 ml / time of the injection.

[0027]

[Table 1]

From Table 1, it can be seen that in the case of Comparative Examples (ratio -2 to 4), unless the injection of the chemical solution is synchronized, the dispersion of the gel time is large and the water stoppage is not good. On the other hand, in the case of the method of the present invention (July-1 to 3), the dispersion of the gel time is small, and the water stoppage is good. Furthermore, when the gel time of the chemical solution exceeds 60 seconds, the dispersion of the gel time tends to increase, and it is found that the gel time is preferably set to 60 seconds or less.

[0029]

As described above, according to the present invention, when injecting a crack into a two-component curable material, the two components can be surely mixed and mixed and cured without causing unreacted components.

[Brief description of the drawings]

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

FIG. 2 is a side view of a plunger type infusion pump according to the method of the present invention.

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]

DESCRIPTION OF SYMBOLS 3 ... Fixing jig, 4 ... Discharge port, 5 ... Suction port, 6 ... Electric motor, 8 ... Reduction gear, 9 ... Eccentric rotor, 10 ... Connecting rod, 11 ... Oil bath, 12 ... Valve chamber, 13 ...
Crank chamber, 15 connecting 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 ... Press tube, 40 ... Working nut, 41a / 42a.
44 stop valve, 45 check valve, P1 first plunger pump, P2 second plunger pump

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoichi Kashima 1-10-3 Hiroo, Shibuya-ku, Tokyo Examiner Tadao Yamada (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 23/02

Claims (4)

(57) [Claims] 1. A crack injection pipe comprising an inner pipe and an outer pipe is formed in a crack occurrence portion of a structure by drilling from the front surface without penetrating a member, and then a crack injection pipe formed of an inner pipe and an outer pipe is inserted into the injection hole. In the inserted state, each liquid of the main agent and the curing agent is pumped by an injection pump in which the discharge flow rate changes with time, and the mixing pipe formed inside the crack injection pipe or the injection pipe tip and the crack at the injection hole deep portion are formed. In the mixing section formed by mixing the two liquids, and injected into the crack,
A crack injection method, wherein the pumping operation of each liquid of the injection pump is substantially synchronized, and a flow ratio of each liquid flowing into the mixing section is maintained substantially constant over time. 2. The crack injection method according to claim 1, wherein the pumping operation is performed by a plunger or piston corresponding to each liquid, and the discharge operation of each plunger or piston is substantially synchronized. 3. The crack injection method according to claim 2, wherein the cross-sectional areas of at least one set of plungers or pistons are different. 4. The crack injection method according to claim 1, wherein the gel time of the two-part curable injection material is 60 seconds or less.