JP2520649Y2 - Grout injection controller - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a grout injection control device which realizes injection accuracy improvement at a low flow rate, unitization of injection control unit and reduction in size and weight in grout injection for ground improvement. .

[0002]

2. Description of the Related Art For grout injection in dams and urban civil engineering, a single-pass system as shown in FIG. 1 and a hole-mouth circulation system as shown in FIG. 2 are generally adopted depending on the piping method of the injection pipe. In a more special case, a hole circulation system is adopted, which is not shown. In the single-pass system shown in FIG. 1, the grout whose concentration is adjusted by the mixer 1 is pressure-fed by the constant-quantity discharge pump 2 and is pressure-fed into the ground by the injection pipe 5 of the boring machine 4 through the supply pipe 3 formed of a rubber hose. It 42 is a packer 43 is a grout hole. At this time, the flow rate and pressure of the grout sent from the constant quantity discharge pump 2 are detected by the flow rate detector 6 and the injection pressure detector 7, and converted into electric signals by the respective converters, and the output thereof is recorded by the recorder 8. Is recorded in the flow rate and is compared with the signal set by the pressure regulator 9, and the opening degree of the control valve 10 is controlled by this comparison signal to return the excess grout, and the pipe 11 returns it to the mixer 1. , It was designed to control the flow rate and pressure of grout to be injected.

[0003]

However, in such a single-path system, the longer the supply pipe 3 made of the rubber hose connecting the control valve 10 and the injection pipe 5, the longer the cement in the supply pipe 3. Settles and adheres. Not so much when the concentration of cement milk is low and the amount of injection from the supply pipe 3 to the ground is large, but when the process of gradually injecting cement milk with a high concentration as the grout injection proceeds, the amount of return from the return pipe 11 is returned. The amount of injection from the supply pipe 3 to the ground gradually decreases, and finally, the flow velocity in the supply pipe 3 almost disappears, and the adhesion in the control valve 10 and the supply pipe 3 increases. Therefore, the injection flow rate and pressure in the ground cannot be accurately controlled, and therefore the pressure exceeding the injection pressure limit causes an abnormal displacement in the ground to raise or tilt structures such as dams and rubber hoses. There were drawbacks such as the troublesome maintenance of the device for cleaning due to internal clogging.

On the other hand, in the hole mouth circulation system, as shown in FIG. 2, from the hole mouth 12 at the tip of the injection pipe 5 to the return pipe 1.
1 is connected, and the control valve 10 is interposed in the middle of the return pipe 11. According to this method, since the grout constantly circulates through the supply pipe 3 and the return pipe 11 even when the injection amount decreases, sedimentation and adhesion of the grout in the pipeline can be prevented.

However, since the flow rate detector 6 and the injection pressure detector 7 are attached to the supply pipe 3, the actual injection amount and injection pressure in the injection pipe 5 cannot be accurately detected, and the control valve 10 is opened. There was a problem that the degree control was also inaccurate.

It is an object of the present invention to improve the injection accuracy at a low flow rate of grout, to realize a unitized injection control unit and to reduce its size and weight.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a plurality of tanks for accommodating grouts composed of liquids A and B, which are hardened when mixed, are separately stored, and the plurality of tanks are independently connected to the holes. Supply pipes, pumps interlocking with each other for sending the A liquid and the B liquid from these supply pipes toward the hole mouths, and the injections that are connected to the hole mouths and discharge the A liquid and the B liquid respectively from the tips. a tube, the the injection pressure detecting section and the injection quantity sensing section unitized provided with an injection control unit that Zaisa through between the injection tube and the hole opening, is discharged from the injection tube when injected into ground , The liquid A and the liquid B are mixed and cured, which is a grout injection control device.

[0008]

In this structure, if the A liquid (A) forming the grout is, for example, water glass, the B liquid (B) is a mixture of a curing agent and an accelerator. Usually, A liquid: B liquid. = 1: 1 mixed. Therefore, the injection amount detection unit 6 detects the flow rate of either the injection pipe 5a or 5b. Then, the total injection amount is displayed and recorded by doubling the detected value. The injection pressure detection unit 7 also detects from the injection pipe 5a or 5b.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals. In FIG. 3, an injection control unit 14 in which the injection pressure detection unit 7 and the injection amount detection unit 6 are unitized is provided so as to face the holes 12 of the injection pipes 5a and 5b. Therefore, in this example, the hole-circulation system is adopted. More specifically, the liquid A (A) and the liquid B (B) that form grout are stored in separate tanks 1a and 1b. Between the tanks 1a, 1b and the hole mouth 12, supply pipes 3a, 3 independent from each other like a double pipe are provided.
b is connected. These supply pipes 3a, 3b are provided with two pumps 2a, 2b for independently pumping the liquid A (A) and the liquid B (B). The supply pipe 3
When the liquid A (A) and liquid B (B) are discharged from the tip of the independent injection pipes 5a and 5b like the double pipes at the positions of the holes 12 in a and 3b and are injected into the ground, It is a method of mixing and curing. In this case, the hole opening 12 and injection tube 5a, between 5b, the injection pressure detecting unit 7 and 6 injection amount detector 6 and the injection control unit 14 unitized is eclipsed set.

In this structure, if the liquid A (A) forming the grout is water glass, the liquid B (B) is used.
Is a mixture of a curing agent and an accelerator.
Solution B is mixed at a ratio of 1: 1. Therefore, the injection amount detection unit 6 detects the flow rate of either the injection pipe 5a or 5b. Then, the total injection amount is displayed and recorded by doubling the detected value. The injection pressure detector 7 also has an injection pipe 5a.
Alternatively, it is detected from either 5b.

When the ratio of the liquid A (A) and the liquid B (B) is other than 1: 1, the ratio can be known in advance from the supply amount of the interlocking pumps 2a and 2b. The total injection amount can be obtained by a simple calculation only by measuring the injection amount of either the liquid or the B liquid. Similarly, pressure may be detected from both injection tubes 5a, 5b and displayed and recorded separately. Further, when the liquid B (B) is composed of two or more kinds and they are separately injected,
The injection pipe made of a heavy pipe is a multiple pipe having three or more pipes.

[0012]

Since the present invention is constructed as described above, it has the following effects. (1) Since the liquid A and the liquid B are separately supplied, the grout is not concentrated and the pipe is not clogged even if the injection amount becomes low and the pipe is not clogged. Therefore, the injection accuracy is improved. (2) Since the pressure and the flow rate are detected between the injection pipe and the hole mouth, the injection pressure and the injection amount are extremely accurate. (3) Since the injection control unit including the injection pressure detection unit and the injection amount detection unit is unitized, the grout injection control device can be divided and carried, and the entire device can be made small and lightweight.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional single-path grout injection control device.

FIG. 2 is an explanatory diagram of a hole-mouth circulation system.

FIG. 3 is an explanatory view showing an embodiment of a grout injection control device according to the present invention.

[Explanation of symbols]

1 ... Mixer, 2 ... Pump, 3 ... Supply pipe, 4 ... Boring machine, 5 ... Injection pipe, 6 ... Injection amount detection part, 7 ...
Injection pressure detector, 8 ... Flow pressure recorder, 9 ... Flow pressure regulator, 10 ... Control valve, 11 ... Return pipe, 12 ... Hole opening,
14 ... Injection control unit.

Claims (2)

(57) [Scope of utility model registration request] 1. A plurality of tanks, each of which contains a grout consisting of liquid A and liquid B which cure when mixed,
Supply pipes independently connected from these plurality of tanks to the hole mouth, and interlocking pumps for respectively sending liquid A and liquid B from these supply pipes to the hole mouth,
Coupled to the bore hole, an injection pipe for ejecting the liquids A and B from the tip, the the injection pressure detecting section and the injection quantity sensing section unitized implantation is Zaisa through between the injection tube and the bore hole A grout injection control device comprising a control unit, and when the liquid is discharged from an injection pipe and injected into the ground, the liquid A and the liquid B are mixed and cured. 2. The grout injection control device according to claim 1, wherein the injection pipe is composed of a multiple pipe, and the liquid A and the liquid B are independently supplied to the multiple pipe.