JPS6329049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a strainer injection device for soil stabilizing chemicals, and more specifically, a system for injecting a soil stabilizing chemical into a strainer without changing the setup after boring soil using an injection pipe configured as a double pipe rod. The present invention relates to a device for individually pressurizing ground stabilizing chemical liquids from above the injection pipe, mixing the two liquids at the time of injection from a nozzle outside the strainer valve, and injecting the mixture into the target ground.

Conventionally, in the strainer injection method of the above type, a number of holes are bored in the peripheral side wall of the injection pipe, the lower end of which is closed in the shape of a cone or with any suitable closing means, and these holes are used to drain the ground stabilization. This method sprays a chemical solution into the target ground, but since the effective cross-sectional area for spraying the chemical solution from the injection pipe is much larger than that of the rod injection method, the chemical solution is spread over a wide area and the ground surface is affected by a sudden rise in pressure. This method is suitable for injecting chemical liquid over a relatively wide range because the possibility of chemical liquid ejecting into the area is reduced.

However, in this strainer injection method, the soil is previously bored to a predetermined depth using a boring machine, and then the strainer injection pipe is buried in the excavated hole, or depending on the soil, the strainer injection pipe is hammered with a pile hammer. The disadvantage is that the workability is poor because of the need to set up the strainer, and additional work steps are required because it is necessary to prevent the strainer from clogging or dirt from entering the pipe. On the other hand, the strainer injection pipe set in the soil as described above is filled with sand to prevent the chemical solution from descending or leaking outside of the intended area. After washing out the sand from the step, a prescribed chemical solution is injected, and this operation is repeated to stabilize the ground of the strainer side wall while stepping up, so the operation is repetitive.
Therefore, there is a drawback that the construction period is inevitably longer and the construction cost is higher as a result.

Furthermore, when injecting chemicals using a boring rod with a double structure, a metal crown and a bit are attached to the tip of the rod having a strainer, and after boring to a predetermined depth while rotating the rod, the tip of the rod is closed. Ground improvement is carried out by injecting a chemical solution into the soil through a strainer, but in this construction method, water flows out from the strainer to pass into the rod during boring work. There is a drawback that the soil around the strainer is disturbed, and even if a chemical solution is injected into this area, the desired ground improvement or reinforcement cannot be achieved.

The present invention eliminates the deficiencies of the prior art described above, and its purpose is to completely separate the liquid passage through the inner and outer tubes by means of a double tube sleeve, and to The water is maintained at a constant pressure by the action of a check valve, and water is constantly ejected from the spout through the inner pipe to prevent soil and mud from flowing into the pipe from the nozzle and clogging, and two-component ground stabilization is performed during injection. It is an object of the present invention to provide a strainer injection device that individually pumps chemical solutions, mixes them in respective nozzle ports, and injects the mixture into target ground. The present invention will be described in detail below with reference to the drawings.

The present invention allows multistage injection. Figure 1A,
B is a schematic diagram for explaining the configuration and function of one embodiment of the device of the present invention, and FIGS. 2, 3, and 4 are respectively shown in FIG.
―'Shows a cross section. FIG. 1A shows the configuration of a double-pipe injection device connected to a double-pipe rod during drilling, and FIG. 1B shows the configuration during injection. Figure 1A,
In B, the same parts are given the same reference numerals and explained, and the detailed structure is omitted and the outline of the main part is shown. This is done by connecting a metal crown (not shown) to the strainer injection pipe 21 connected to the double pipe rod, setting it on the boring machine, driving the boring machine, and injecting the strainer from the double swivel (not shown). Supply cooling or circulating water to the pipes.

In the figure, 21 is a strainer injection pipe (as described above), 22 and 23 are an inner pipe and an outer pipe, respectively.
24 is a piston portion, which is always pushed upward by a coil spring 25 and is in the position shown in FIG. 1A during drilling. The outside of the strainer injection pipe includes a nipple 26 connected to the outer pipe of the double pipe rod, a strainer 27 and a nipple 28, and a spool valve 2.
9 and chemical liquid passages 30 and 33, the inside of which is provided with a passage 22 connected to the inner tube of the double tube rod. As described above, the piston portion 24 is disposed between the inner tube and the outer tube of the strainer injection tube 21, and is pushed upward by the coil spring 25 during drilling (FIG. 1A). During injection (Figure 1B)
When liquid A is injected into the outer tube at a pressure of 3 to 8 kg/cm ² , the piston is pushed downward against the force of the coil spring 25 to the position shown in FIG. 1B. That is, as shown in the figure, it is pushed down by a distance l.

Next, a description will be given of the water supply channel and chemical liquid passage during drilling and injection. On the outside of the strainer injection pipe,
A plurality of ejection ports 34 are arranged, and passages 30, 33 communicating with these are provided on the outer side wall. Holes 31 and 32 are bored in the inner tube, and when the holes are bored, they communicate with the water supply passage hole 35 of the piston portion 24 and are connected to the passage 33. The lower part of the outer tube is connected to a crown with a bit (not shown). Piston part 24
A check valve consisting of a steel ball 37 and a coil spring 38 is disposed below, so that the protrusion of the side wall 40 is always closed by the steel ball 37. coil spring 3
The pressure of No. 8 is approximately 2 Kg/cm ² . The supply pressure of cooling or circulating water injected into the inner pipe during drilling is approximately 3 to 8
Kg/cm ² , the cooling water flows through holes 31 and 32 of the inner tube.
At the same time as the water supply valve connecting the hole 31, hole 32, water supply passage hole 35, passage 33 and spout 34 is opened, a check valve is opened at the lower part of the inner pipe, and the water coming out of the hole 32 flows into the steel ball. 37, holes 31-hole 32-hole 39-
The passages on the crown side are connected so that the crown side is also injected, so that during drilling, the work can proceed with more injected than on the spout side. Next, after the prescribed work is completed, it is switched to drug injection, and A
Inject liquid (aqueous solution containing sodium silicate, etc. as the main ingredient) and B liquid (aqueous solution containing sodium bicarbonate, sodium hydrogen sulfate, etc. as auxiliaries) from the inner tube. The injection pressure is 3 to 8 kg/cm ² as described above. At this time, the piston portion 24 is pushed down in the same manner as described above, and the water supply valve below the inner tube is closed. On the outer tube side, the piston portion 24 is pushed down against the force of the coil spring 25, and the spool valve 29 is opened. Then, a chemical liquid (liquid A) passage leading to the hole 43 - passage 44 - chemical liquid passage 30 - spout 34 is formed, and at the same time, from the inner tube side, it is also formed from the hole 31 - hole 32 - chemical liquid passage hole 36 - passage 33 -. Chemical solution (B) reaching the spout 34
liquid) passage is configured. In addition, since a protrusion 41 is provided in the connecting portion of the passages 30 and 33 facing the spout 34, the above-mentioned liquids A and B are mixed and stirred outside the spout 34, and the target Injected into the ground.

As described above, the present invention has a structure in which water is always ejected from the spout 34 during drilling, so there is no intrusion of muddy water at all. In addition, the lower end of the inner tube is
A water supply valve connected to the lower end of the piston is opened, and the steel ball 37 is pushed down to move from the dotted line position to the solid line position and inject into the crown side, thereby preventing muddy water from entering. Therefore, malfunction of the strainer valve does not occur. Also,
The device of the present invention is a multi-stage injection system in which the A liquid and B liquid passages are completely separated and the ejection ports can be provided in multiple stages, so that the work efficiency can be improved.

Furthermore, since the mixing of liquid A and liquid B is carried out outside the strainer valve, there is no fear that the chemical liquid will solidify inside the strainer valve, and there will be no malfunction, and it can also be used for instant bonding work. can.

[Brief explanation of the drawing]

FIGS. 1A and 1B show the configuration of an embodiment of the present invention, with FIG. 1A being an explanatory view of the configuration and functions during drilling, and FIG. 1B being an explanatory view of the configuration and functions during injection of a chemical solution. 2, 3 and 4 show cross-sectional views -', -' and -' of FIG. 1A, respectively. In FIGS. 1A and 1B, 22 is an inner tube, 23 is an outer tube, 24 is a piston portion, 25 is a coil spring, 37 is a steel ball, 38 is a coil spring, and 34 is an ejection port.

Claims (1)

[Scope of Claims] 1. An inner tube with a plurality of holes bored in the longitudinal direction of the outer circumferential wall, and a plurality of ejection ports arranged in the longitudinal direction of the outer circumferential wall and a passage for a chemical liquid inside the inner tube, which is piped outside the inner tube. A movable piston part forming a perforated outer pipe and provided with passage holes for water supply and chemical solution communicating between the hole in the inner pipe and the spout port in the outer pipe is slid into the gap between the inner pipe and the outer pipe. In addition, a coil spring is configured above the movable piston section to always urge the movable piston upward, and a check valve is configured below the movable piston section, so that when drilling, the movable piston section is located above;
and the water supply passage hole of the movable piston part communicates with the hole of the inner tube and the spout of the outer tube, and the check valve is opened by water supply from the hole of the inner tube, and water is supplied from the spout and the tip of the device; When injecting a chemical solution, the movable piston part slides downward due to the hydraulic pressure, the check valve is closed, and the chemical liquid passage hole in the movable piston part, the hole in the inner tube, and the spout port in the outer tube coincide, and one of the chemical liquids is injected. An injection passage is formed between the outer tube and the movable piston, and a medicinal liquid passage formed between the outer tube and the movable piston by the downward movement of the movable piston communicates with the spout through the passage inside the outer tube. A strainer injection device for soil stabilization chemicals.