JPS58218511A - Control method and apparatus for grout injection pipe - Google Patents

Abstract

PURPOSE:To inject a grout into the ground according to grouting conditions by a method in which a sucked liquid switching means is provided between a storage tank and a grout pump, and the switching means is operated a centralized operation unit near the injection pipe. CONSTITUTION:A grout storage tank G and a water storage tank W are connected through hoses h1 and h2 to a switch valve V to be operated by a centralized operation unit OS and then connected to a grout pump P. When water is supplied, the centralized operation unit OS is actuated to supply water W to an injection pipe R through the switch valve V by the grout pump P. When a grout is supplied, the centralized operation unit OS is actuated and water W is switched to a grout G which is in turn sent to the injection pipe R.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a chemical injection management method, more specifically, a suction source switching means is arranged on the inlet side of a grout pump, and the suction source switching means is operated near the injection pipe to control the suction liquid. The present invention relates to a chemical liquid injection management method and device for selecting and switching a feeding liquid.

This type of chemical injection method includes a method in which an injection tube is inserted into a pre-drilled poling hole to inject the chemical, and a drilling rod injection method in which drilling and chemical injection are performed using the same injection tube. Isun's method also employs a system in which liquid from a storage tank is pumped into an injection pipe using a grout pump.

Note that the term "chemical injection" used in the present invention refers to a method of injecting an improving material solution to strengthen and improve the ground, and the injection pipe may be attached to an auger, for example, or a system. Therefore, liquid drug injection is used in a broad sense. As a result, it also includes chemical injection in high-pressure injection method and anchor method.

By the way, when injecting chemical liquids, various liquids are selected in the order of the process. That is, (
1) In the high-pressure injection injection method, drilling water, injection test water,
(2) In the cement grout injection method, water for permeability test, cement grout, roud, and washing water are used in sequence, (3) In the 1 shot method, water for injection test, grout liquid, Using washing water sequentially, (
4) The 1.5-shot or 2-shot injection method uses drilling water, discharge test water, grouting liquid, and cleaning water. (5) The recently developed so-called double-pipe composite injection method, which uses a special packer Composite injection method using pipes,
Alternatively, in the injection method using a double flow pipe with multiple injection ports, drilling water, discharge test water, grout A1 grout B,
Washing water is used selectively.

Since it is necessary to select and switch between various liquids for each injection cycle, it has conventionally been common practice to have at least one person monitoring and operating the injection pipe installation site and the grout pump, especially the storage tank area. The latter monitoring worker redirects the suction hose from one storage tank to another each time while standing, communicating with words or signals, or by phone if remote, when changing fluid selections. It was something. The switching may also be performed by operating a manual switching valve handle.

However, in this case, □ is caused by, firstly, insufficient communication, which can lead to errors in liquid delivery selection, which is particularly dangerous in recent years with complex construction methods, and secondly, it requires at least two workers, which is not reasonable. Thirdly, replacing the suction hose not only pollutes the area around the storage tank, but also causes the liquid attached to the hose to mix with the liquid in other storage tanks, changing the quality of the liquid. Sometimes it happens.

Originally, instead of replacing the suction hose for each storage tank, we placed a dedicated grout pump for each liquid system and removed the suction hose from the grout pump. If switching valves are provided at the location, as in, for example, Japanese Patent Application Laid-Open No. 56-28992, and the liquid is not fed, it is ideal to return it to the storage tank from the return hose via the relief pulp.

However, the distance from the reservoir to the injection pipe is usually at least 20
m, and in extreme cases it can reach up to 500 m. As a result, the number of pumps increases, and additional hoses and relief pulp are required, which is not economical.

On the other hand, there are cases in which the entire injection plant is automated and all its control systems are centralized in the control room, and injection management is performed in the container-style control room, but only in the control room where injection tubes are installed. It is impossible to obtain all the information, and the meaning remains that the monitoring panels are concentrated in the monitoring room. In other words, although essentially accurate injection status and information to be dealt with afterwards are obtained at the injection site, that is, at the injection pipe installation site, they are managed in a monitoring room far away from here. It's impossible.

The present inventors fundamentally reviewed the conventional management method and its problems, and worked diligently to develop a rational and economical method, and as a result, the present invention was completed.

That is, in the first invention, when liquid from a plurality of storage tanks is pumped by a grout pump and fed to an injection pipe, a blocking liquid switching means is provided between the storage tank and the grout pump, and this suction liquid switching means is provided. A suction flow path is communicated from the means to a plurality of corresponding storage tanks, and a central operation unit is provided between the grout pump and the injection pipe and near the installed injection pipe, and the suction flow is controlled by the operation of the central operation unit. The present invention is characterized in that the suction liquid is automatically selected and switched by operating the liquid switching means.

Further, a second aspect of the invention is a device capable of force-feeding liquid from a plurality of storage tanks to an injection pipe using a grout pump, and capable of feeding a separately prepared fluid from the vicinity of the injection pipe to the injection pipe instead of the liquid. The suction source switching means disposed between the storage tank and the grout pump, the suction flow path communicating with the plurality of storage tanks corresponding to the suction source switching means, and the grout pump and the injection pipe. a central operation unit installed near the injection pipe and for operating the suction source switching means to select and switch the suction liquid; and a separate fluid delivery unit installed in or near the central operation unit. a supply source, and a sub-switching means for switching to supply fluid from another fluid supply source to the injection pipe instead of the liquid guided to the central operation unit section by operation by the central operation unit. According to the present invention, there is provided a chemical liquid injection management method and apparatus thereof that are economical, have good workability, and are highly reliable.

Next, first, a specific example of the outline of the present invention will be explained with reference to FIGS. 1 to 4. FIG. 1 shows an example of application to a one-shot construction method, such as a high-pressure injection method. A branch suction hose h1 + hz is placed in advance in the grout storage tank G and water storage tank W.N1 A three-sided electromagnetic switching valve V is arranged as an example of a suction liquid switching means. Connected with main suction hose SH.

A feed hose FH is connected to the grout pump P to the central operation unit O8, and from there a liquid feed hose FH is connected to the swivel SW to supply liquid to the injection pipe R.

Here, the centralized operation unit (O8) includes a work operation button and a display that shows the current work, a flowmeter and its current flow rate display, a display for the total amount of injection to date, an injection time per step, the number of steps, and Each step length display, an operation switch for selecting droplet feeding (liquid feeding), and a telephone for calling the central control room when necessary are provided. In addition, as shown in FIG. 1, in the central control room X, each storage tank G,
In addition to W, a switching valve V, and a grout pump P, various other equipment is provided. The selection changeover operation switch of the central operation unit) O8 is electrically connected to the changeover valve ① and the grout pump P.

In such chemical liquid injection equipment, when injecting a chemical liquid, the injection pipe R is installed in the target ground according to a conventional method. At that time or after that, if water W is needed, the operator operates the water supply knobs on the central operation unit O8 as shown in Fig. 1, and the water W is sent to the grout pump via the switching valve V. It is fed to the injection pipe R by P. Also, when you want to feed grout (chemical solution) G, operate the corresponding knobs,
Switch from water W to glau) G. By such operation,
The switching valve ■ electrically switches the flow path.

Figure 2 shows an example of the 1.5 shot construction method, with chemical solution GA,
Using GB, there are two switching valves V, , V corresponding to this
This is an example in which the liquid is sent using a dual-port cylindrical plunger grout pump P or the like.

Figure 3 shows an example of the two-shot construction method, which is basically the same as the case in Figure 2.

Fig. 4 shows a flowchart using three types of grouts GA, CB, and Qc, four switching valves Vl-V4 for water W, and two grout pumps Pl+P2, for example, three-channel pipes. This is an example of sending it to the sexual immigration bureau R.

In this case, the liquids from the liquid feed hose FH1 and the liquid feed hose FH2 are combined, and then the combined liquid (slow-setting chemical liquid)
is fed through the fluid feed hose FH'. Three channels are formed in the injection tube R, one of which communicates with the discharge port at the tip of the injection tube R, and the other two channels are independently guided closer to the injection port on the base side. The two liquids from each channel n1 are injected from the injection port while being brought together, contacted and mixed. Further, an instant-setting drug solution is injected from the injection port on the base side, and a slow-setting drug solution is injected from the discharge port at the tip, either at the same time or at intervals, ie, so-called composite injection.

Incidentally, cleaning with water is normally performed when adding or removing unit injection pipes, but if this water is led from a distant water tank W to the injection pipe R, it is necessary to remove the water from the water tank W to the central operation unit O8. This is especially time-consuming when the distance to the destination is long. Therefore, another fluid supply source W'' consisting of an ice cutting tank, its supply means, etc. is provided in or near the central operation unit O8, and a supply hose FH2 to the injection pipe R is provided.

FHa, FH4 are provided with sub-switching means Ql, Q2. Q3 For example, the liquid sending hose FH' is equipped with a switching valve.

When cleaning each flow path in FH3, FH4 and injection pipe R, sub-switching means Q! , Q2-O3 is activated to supply water from another fluid supply source W'' to each channel in the injection pipe R instead of the liquid flowing through each hose for re-cleaning. In the case of injection, it is sufficient to operate the sub-switching means Q1-O2 and O3 to flow the original liquid.In this case, the sub-switching means Q1-
It is desirable to provide a check valve before O2 and O3. Furthermore, when providing another fluid supply source W', an air source A is provided when a method of supplying water using air pressure is adopted. Furthermore, if it is desired to empty each flow path of the injection pipe R, the air source A is switched between the aforementioned switching means Ql and O2-Qa.
Each channel can be easily emptied by connecting it to another switching means (not shown) provided in the same manner as shown in Fig. 5, and supplying air instead of the supplied liquid. uses four types of grouts, G'A, GB, Qc, and Qn, using four switching valves Vl-V4k,
In addition, two grout pumps P and P are used to feed the grout to the four-channel injection pipe, and from the tip of the pipe and the injection port (not shown) on the base side of the grout, simultaneously or at mutually spaced intervals. In the examples shown in Figures 2 to 5, which are injection examples, the operational management aspects are almost the same as those in Figure 1, so we will not discuss them in detail. As an example of pipes, if a plurality of injection pipes are installed in a certain target ground, equipment such as operation management devices and pumps may be added accordingly.

In the above example, the operation management device is separate from the injection tube installation machine, but it is also within the scope of the present invention to integrate them.

As described above, the present invention provides a suction liquid switching means between the storage tank and the grout pump, and a centralized operation unit between the grout pump and the injection pipe and near the installed injection pipe. Since the suction liquid (feeding liquid) 7) is automatically switched by pulling, there is no need for a worker near the suction hose once the -H is set, and the injection work can be done virtually by one person, making it economical. In addition, it is possible to reliably prevent communication errors as in the past and achieve highly reliable construction.In addition, switching can be done quickly and accurately, and the vicinity of the storage tank will not be contaminated. Furthermore, compared to the conventional return method,
It is extremely economical in terms of equipment costs, etc. Particularly noteworthy in the present invention is that the switching operation is performed near the actually installed injection tube, and by this, it is possible to check the installation status of the current injection tube, the status of the injection hole, etc. Since it is possible to grasp the situation such as how the pipe is being drilled, whether slime is being discharged from the injection hole, or sudden changes, it is possible to achieve detailed chemical injection management for the target ground. 0 In this respect, the limitations and problems of management from the centralized management side that have been seen in some conventional systems can be solved at once.

On the other hand, in the second invention, in addition to the above-mentioned effects, since another fluid supply source and a sub-switching means are provided, the fluid can be quickly replaced when cleaning the flow path, etc.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet showing the arrangement of injection equipment for carrying out the method of the present invention, and FIGS. 2 to 4 are flow sheets of different arrangement examples. G, GA-GD... Grout (storage tank) W... Water (storage tank) V, V, ~v4... Switching valve P...
Grout pump O8... Central operation unit R... Injection pipe

Claims (2)

[Claims] (1) When liquid from a plurality of storage tanks is pumped by a grout pump and sent to an injection pipe, a suction source switching means is provided between the storage tank and the grout pump, and the suction source switching means handles the problem. A suction channel is communicated with a plurality of storage tanks, and a centralized operation unit is provided between the grout pump and the injection pipe and near the installed injection pipe, and the suction liquid switching and switching means are operated by the centralized operation unit. A chemical liquid injection management method 0 characterized by operating the system and automatically switching the suction liquid selection. (2) A device capable of force-feeding liquid from a plurality of storage tanks to an injection pipe using a grout pump, and capable of feeding a separately prepared fluid to the injection pipe from near the injection pipe in place of the liquid; lt'L'fc suction liquid switching means disposed between the grout pump, a suction flow path communicating with the plurality of storage tanks corresponding to the suction source switching means, and between the grout pump and the injection pipe. A central operation unit provided near the installed injection pipe and for operating the suction source switching means to select and switch the suction liquid, and another fluid delivery system provided within or near the central operation unit. A supply source, and a sub-switching means for switching to feed fluid from another fluid supply source to the injection pipe instead of the liquid guided to the central operation unit section by operation by the central operation unit. Characteristic chemical injection management device.