JPH033630Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a double tube rod compound injection device.

Prior art and its problems In recent years, as a ground improvement method, the so-called composite injection method, in which a primary injection of an instant-setting chemical solution is first performed, and then a secondary injection of a slow-setting chemical solution, has become popular. In the equipment applied to the construction method, it is necessary to switch the discharge of chemical solutions from different positions at the same time using one monitor (advanced equipment). Conventionally, methods for switching the discharge have been proposed, such as using the flow velocity and pressure of the injected chemical itself to move valves and pistons, or inserting a ball-shaped object into the liquid delivery pipe. .

However, the method that uses the flow rate and pressure of the chemical solution is
Not only is it unreliable, it requires a complicated device to be installed in a narrow tube, which inevitably leads to frequent failures.Also, in the case of a system that uses a ball, the liquid supply must be stopped once and the ball must be placed inside the tube. However, there were drawbacks such as not only being time consuming but also the inability to open the discharge port again.

The present invention was made with the aim of eliminating these conventional problems.

Means for Solving the Problems The present invention provides two types of instant-setting and slow-setting liquids fed from a double-tube rod into upper and lower tubes provided in the tip device section at the bottom of the outer tube of the rod. In a double-tube rod compound injection device that discharges by switching appropriately from the outlet of each stage, the inner tube of the double-tube rod is free with respect to the outer tube, and the lower end has liquid passage holes in two stages, upper and lower. have,
A drive device is installed on the ground for appropriately moving the inner tube up and down within the outer tube and the tip device section below the outer tube,
Inside the tip device section, a seal ring section having an internal gap communicating with the discharge port is provided for each stage of the discharge port.
The seal ring part, which is fixed to close the circumferential gap between the inner tube and the upper discharge port, is attached to the upper liquid passage hole when the lower liquid passage hole of the inner tube is located within the internal gap. The seal ring part is configured to open into the circumferential gap above the ring part, and the seal ring part assigned to the lower discharge port has one of the upper and lower liquid passage holes of the inner tube located in the internal gap. The present invention relates to a double-tube rod compound injection device, characterized in that the other side is configured to be closed by the ring portion.

Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.

FIG. 1 is an overall view schematically showing the device of the present invention, in which 1 is an outer tube of a double tube rod, 2 is an inner tube 3 inserted into the outer tube 1 so as to be movable up and down, and the inner tube 2 is connected to the inner tube 2. A cylinder serving as a driving device installed on the ground for vertical movement operation, 4a and 4b are discharge ports formed in two stages, upper and lower, in the tip device section 4 at the bottom of the outer tube 1, 5 and 6 are inner and outer tubes 1 , 2 is the liquid inlet.

FIGS. 2A, 2B and 2C are enlarged sectional views showing the tip device section 4 of the double tube rod in each operating condition.

As is clear from FIG. 2, the inner tube 2 has two upper and lower liquid passage holes 7a and 7b at its lower end.

Further, inside the tip device section 4, there are discharge ports 4a at each stage,
Seal ring parts 9 and 10 that close the circumferential gap 13 between the inner pipe 2 and the inner pipe 2 are fixedly provided for each of the inner pipes 4b.

The seal ring portion 9 corresponding to the upper discharge port 4a is composed of a pair of upper and lower seal rings 9a and 9b, and a gap 11 between the rings 9a and 9b communicates with the upper discharge port 4a. Upper seal ring 9a
The wall thickness of is smaller than the vertical interval between the upper and lower liquid passage holes 7a and 7b of the inner tube 2. Therefore, when the lower liquid passage hole 7b is located within the gap 11, the upper liquid passage hole 7a is closed to the upper seal. It is configured to open into the circumferential gap 13 above the ring 9a (see FIG. 2B).

On the other hand, the seal ring part 10 corresponding to the lower stage discharge port 4b includes a pair of upper and lower seal ring parts 10a, 10.
The gap 12 between the rings 10a and 10b communicates with the lower discharge port 4b. The wall thickness of the upper seal ring 10a is larger than the vertical interval between the upper and lower liquid passage holes 7a and 7b of the inner tube 2, so that when the lower liquid passage hole 7b is located within the gap 12, the upper liquid passage hole 7a closes to the upper seal. It is configured to be closed by the inner circumferential wall of the ring 10a (see FIG. 2C).

FIG. 2A shows the situation during the drilling operation. During this operation, the piston rod 3a of the cylinder 3 is in the advanced position as shown in FIG. The liquid passage holes 7a and 7b, which are in a moving position and are formed in two upper and lower stages at the lower end of the inner tube 2,
The lowest seal ring section 8 provided in the outer tube 1
It is now located further down. By supplying water through the inner pipe 2 in this state, the water can be spouted into the ground from the liquid passage holes 7a, 7b at the lower end of the inner pipe 2 through the lower end opening 1a of the outer pipe 1.
It can contribute to drilling as usual.

FIG. 2(b) shows the situation during the primary injection, that is, the injection operation of the instantaneous drug solution. During this operation,
The piston rod 3a of the cylinder 3 is withdrawn from the advanced position shown in FIG. It communicates with the upper discharge port 4a of the tip device section 4 through the gap 11 between the pair of upper and lower seal rings 9a and 9b provided in the upper stage. It communicates with the circumferential gap 13 between the inner and outer tubes 1 and 2. In this state, as usual, the outer tube 1
When liquid A is fed through the inner tube 2 and liquid B is fed through the inner tube 2, the liquid A in the outer tube 1 enters the inner tube through the upper liquid passage hole 7a of the inner tube 2 before the discharge port 4a.
While being mixed with the liquid, it is injected into the ground from the upper discharge port 4a through the lower liquid passage hole 7b and the gap 11.

FIG. 2C shows the situation during secondary injection, that is, injection of a slowly setting chemical solution. During this operation, the cylinder 3 is operated so that the lower liquid passage hole 7b of the inner tube 2 is aligned with the lower discharge port 4b. The inner tube 2 is moved down to the position where it is.
Of the middle pair of upper and lower seal rings 10a and 10b provided in the tip device section 4 of the outer tube 1, the upper seal ring 10a has a thick wall and seals the upper liquid passage hole 7a of the inner tube 2. are doing. Therefore, only the lower liquid passage hole 7b communicates with the lower discharge port 4b through the gap 12 between the seal rings 10a and 10b.
It is sufficient that at least one of the upper and lower liquid passage holes 7a, 7b communicates with the discharge port 4b through the gap 12. In this state, the purpose of secondary injection can be achieved by supplying into the inner tube 2 a slow-setting liquid drug consisting of liquids A and B mixed in advance in the usual manner.

Effects In the present invention, the discharge port of the tip device is configured to be switched using the inner pipe of the double pipe rod driven by the drive device installed on the ground. Switching and opening/closing can be performed stably and reliably with each operation, and even if the chemical solution solidifies in the tube, it can be forcibly switched, and there is no need to provide a switching device inside the tip device. It has the advantage of being structurally simple and less likely to break down, and since the switching of advanced equipment can be confirmed on the ground, it can increase the reliability of work.It is possible to simplify the structure of this type of equipment and improve its performance at the same time. obtain.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram schematically showing the entire device, and FIGS. 2A to 2C are enlarged sectional views showing the tip device section in each operating state. In the figure, 1 is an outer tube, 2 is an inner tube, 3 is a cylinder, 4 is a tip device section, 4a, 4b are discharge ports, 5 and 6 are liquid inlets, 7a, 7b are liquid holes, 8, 9 and 10 are seal ring parts, 11 and 12 are gaps, 1
3 is the circumferential gap.

Claims (1)

[Scope of utility model registration request] This type of liquid agent is of a type in which two types of instant-setting and slow-setting liquids are fed from a double-pipe rod and are selectively discharged from upper and lower two stages of discharge ports provided in the tip device section at the bottom of the outer tube of the rod. In the double tube rod compound injection device, the inner tube of the double tube rod is free from the outer tube and has two upper and lower liquid passage holes at the lower end, and the inner tube is connected to the outer tube and its lower part. A drive device is installed on the ground to move the tip device up and down appropriately within the tip device section, and in the tip device section, for each discharge port of each stage, a seal ring portion having an internal gap communicating with the discharge port is connected to the inner pipe. The seal ring part is fixedly installed to close the circumferential gap between the inner tube and the upper discharge port. The seal ring part, which is configured to open into the above-mentioned circumferential gap above the ring part and which is assigned to the lower discharge port, is configured to open into the above-mentioned circumferential gap when one of the upper and lower liquid passage holes of the inner tube is located within the internal gap. , the other of which is configured to be closed by the ring portion.