JPS6239132Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology is a double-pipe chemical injection pipe used for chemical injection work used for ground improvement, etc., which has an inner pipe for spouting water from the borehole at the tip of the inner pipe. This invention relates to a chemical liquid injection tube structure that has an outer nozzle and an inner nozzle that face the inner tube and communicate with the inner tube lumen and the inner and outer tube lumen from the side, and has a sleeve valve that controls opening and closing of both nozzles. A state in which a sleeve valve slidably provided in the lumen in the inner tube is actuated in response to stress by a throw-in ball valve that is set when injecting a chemical solution, and hydraulic pressure acts on the inner pipe into which the ball valve is inserted. This invention relates to a drug solution injection tube structure in which the inner nozzle communicating with the inner tube is opened only at this point to eject the drug solution, and the drug solution is mixed and injected together with the drug solution from the outer nozzle communicating with the outer tube.

<Prior art> As is well known, chemical injection is carried out during various types of civil engineering works such as ground improvement work, but in the construction of seed chemical injection, not only drilling water is injected, but gel time adjustment is also required. In order to prevent groundwater contamination, the so-called double pipe injection method is used.

However, conventional chemical injection tubes have the disadvantage that they are easily clogged because they have a common jetting section for drilling water and chemical liquid from the tip of the tube.

To deal with this, we have proposed an improved chemical injection pipe in which a side injection nozzle is attached to the double pipe in communication so that the two chemicals are mixed just before the ejection, or the two chemicals are mixed in the ground. However, the structure of the pressure-responsive valve for water supply to the borehole and water supply to the slime up is extremely complicated, and it is difficult to completely avoid clogging during operation.

<Purpose of the invention> The purpose of this invention is to solve the problems of the chemical injection tube based on the prior art described above, and to create two nozzles, an inner nozzle and an outer nozzle, which face toward the side of the tube. The inner nozzle that communicates with the conduit is provided with a slidable sleeve valve that inserts a ball valve that is set later, and the design is simple and rational, making it an excellent product that will benefit the field of soil improvement technology application in the construction industry. The present invention aims to provide a drug solution injection tube structure.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of this device, which is based on the above-mentioned claims for utility model registration, is based on the above-mentioned purpose. The supplied drilling water is ejected from the outer nozzle to the pipe side through the ducts of the outer pipe and inner pipe, and is supplied to the slime up to reduce the friction of the pipe drilling. By blocking the nozzle, the drilling water is fed to the crown bit at the tip of the pipe to promote drilling, and when injecting the chemical, the water supply is stopped and the ball of the ball valve is moved from the ground. When the chemical liquid is fed into the inner tube and locked by the sleeve valve, one of the chemical liquids is ejected from the outer nozzle to the side from the conduit between the inner and outer tubes, and the other chemical liquid fed from the inner tube closes the ball valve. The sleeve valve is pushed forward by the pressure, the supply to the crown bit side is stopped, and the chemicals are ejected from the inner nozzle. Technical measures have been taken to prevent the mixture from gelling in the nozzle and tube.

<Embodiment - Configuration> Next, one embodiment of this invention will be described below based on the drawings.

Reference numeral 1 denotes a chemical liquid injection tube which forms the center of the gist of this invention, and its base is screwed into the female threaded portion 3 of the outer tube 2, and fitted into the sleeve 5 of the inner tube 4 by sealing via an O-ring 6. An appropriate double pipe rod joint (not shown) is connected and extended.

On the other hand, the extension part 7 of the inner tube 4 is formed in such a way that a seat 9 seats and seals a ball 10 as a check valve in an internal conduit 8, and a spring seat 11 at the tip thereof.
An elastic spring 12 is interposed between the ball 10 and the ball 10, and a well-known crown bit 14 for drilling holes is attached to the tip of the ejection cavity 13 beyond the elastic spring 12.

Three nozzle holes 15, 15, 15 are bored at a predetermined portion of the outer tube 2 at equal intervals in the circumferential direction, and the inner surface is formed so that ring-shaped ejection holes converge in the ejection direction. Outer nozzles 16 each having a tapered shape are screwed into the outer tube 2 through threaded portions 17 such that the depth can be freely adjusted.
It is adapted to be connected to a ring-shaped lumen 18 formed between.

Reference numeral 19 denotes an inner nozzle, which is appropriately fixed to the outer surface of the inner tube 4 via a packing 20, and is installed concentrically with a nozzle gap 21 connected to the outer nozzle 16 and the conduit 18 formed around it. At the same time, the inner nozzle 19 is communicated with the lumen 8 within the inner tube 4.

In the conduit 8 of the inner tube 4, there is a sleeve valve 24 as a control mechanism, which has a hemispherical ring-shaped seat 22 on the outer surface and a tapered stepped seat 23 on the inner surface. 4 is freely slidable in the axial direction via an O-ring 25, and is provided in the cavity 26 of the inner tube 4 opposite to the sleeve valve 24 via an elastic spring 27. A stopper ball 30 is loosely fitted between the tapered part of the ring sleeve 28 and a seat 29 formed in the cavity 26, so that the stopper ball 30 can be freely fitted into and removed from the hemispherical ring-shaped seat 22, and the sleeve valve 24 is locked. I try to do that.

In addition, 31 is a ball as a ball valve, which is inserted from the ground into the rod joint when injecting medicine, passes through the inner pipe 4, and is set on the step seat 23 of the sleeve valve 24, and 32 is a stopper. The stroke of the sleeve valve 24 is regulated.

<Embodiment - Effect> In the above-described configuration, when drilling a hole, as shown in FIG. When the inner nozzle 19 is closed, the stopper ball 30 is fitted into the hemispherical ring-shaped seat 22 by the pressing action of the inner taper part of the upper end of the ring sleeve 28 by the elastic spring 27, and the sleeve valve 24 is closed. is inner nozzle 19
With the rod joint connected, the chemical injection tube 1 is rotated in a predetermined manner and excavates the ground (not shown) through the crown bit 14, while also opening the conduit 18 between the inner and outer tubes 4 and 2. , drilling water is supplied to the conduit 8 in the inner tube 4.

The drilling water that is conducted through the conduit 8 in the inner pipe 4 passes through the sleeve valve 24, and the water pressure causes the check valve ball 10 to move against the elastic spring 12. The water is opened and ejected into the ground from the spout cavity 13 to promote drilling, while the drilling water passing through the conduit cavity 18 flows through the outer nozzle 16 and the inner nozzle 19.
It is ejected laterally in a ring shape from the gap 21, reduces the drilling friction of the tubular body while preventing both nozzles from clogging, and is used for slime up, and drilling is performed.

When drilling to a predetermined depth is completed in this way,
At the same time as stopping the supply of drilling water, as shown in FIG. make it stop

Therefore, the two pipes were connected via a double pipe rod joint.
When the seed chemical solution is supplied, one of the chemical solutions, which is pumped through the conduit 18 between the outer tube 2 and the inner tube 4, becomes a ring-shaped jet from the gap 21 of the outer nozzle 16 and is ejected laterally in a convergent manner. In addition, the lumen 8 of the inner tube 4
The other chemical liquid that was fed is forced to move the sleeve valve 24 through the ball 31 by the elastic spring 2 due to the feeding pressure.
As a result, the hemispherical ring-shaped seat 22 displaces the stopper ball 30 to the side, and the stopper ball 30 is moved forward and stopped by being locked by the stopper 32.

Thus, the rear end of the sleeve valve 24 opens the inner nozzle 19, thereby opening the lumen 8 of the inner tube 4.
The other chemical solution fed to the inner nozzle 19 is blocked by the ball 31 and the sleeve valve 24 and is ejected to the side from the inner nozzle 19 without being fed to the ejection cavity 13.

Therefore, the other chemical liquid from the inner nozzle 19 and the other chemical liquid are surrounded by the outer nozzle 16.
One of the chemical solutions ejected from the nozzle crosses the other and mixes outside the nozzle due to the convergent jetting of the one of the chemical solutions, and is injected into the ground (not shown).

In this case, since the outer nozzle 16 is screwed onto the outer tube 2, the cross-mixing position of the two liquids can be adjusted in advance by adjusting the screwing depth of the outer nozzle 16 with respect to the outer tube 2. It can be adjusted to the area directly next to the body, inside the nozzle hole 15, inside a drilling hole, and inside the ground, making it possible to control the gel time.

In this case, a chemical solution with a short gel time is extremely effective.

In this way, rotate while pulling up the tube body,
Alternatively, by non-rotating it, a predetermined chemical injection process can be performed.

It should be noted that the embodiment of this invention is of course not limited to the above-mentioned embodiment, and various embodiments are possible.For example, the sleeve valve 24 can be fixed and slid open using a sear pin type. Of course, the ball 10 as a valve and the return spring 12 may be omitted, and the number of nozzles is not limited to three.

<Effects of the invention> As described above, according to this invention, in a double-tube chemical injection tube structure, a nozzle is provided on the tube side with the nozzle oriented outward, and the outer nozzle is communicated with the lumen of the outer tube. The inner nozzle is connected to the lumen of the inner tube, and the sleeve valve, which is set by inserting a throw-in type ball valve into the lumen of the inner tube, can freely open and close the inner nozzle. Because of this design, there is no mechanism for mixing the medicinal liquid within the tube, compared to a method in which the medicinal liquid is basically ejected from the tip of the tube, and the nozzle tip is connected to another conduit, which prevents clogging. Therefore, the effect that medicine can be injected according to the settings can be achieved.

In addition, the sleeve valve automatically closes the inner nozzle until the injection-type ball valve is inserted, so that during drilling, drilling water is sent to the inner and outer pipes and the crown bit and Another advantage is that water can be automatically supplied to the outside of the side wall to smoothly facilitate drilling.

Furthermore, when injecting chemicals, simply by turning on the injection type ball valve, the sleeve valve is displaced in response to pressure and opens the inner nozzle, thereby making it possible to automatically control the injection of chemical liquids.

Furthermore, by adjusting the relative depth of the outer nozzle to the outer pipe, the location where the two liquids are mixed can be adjusted to the nozzle hole, the pipe side, or in the ground, which simply prevents clogging in the pipe. Not only is it possible to do this, but it also makes it possible to adjust the gel time, which is an excellent effect.

[Brief explanation of the drawing]

The drawing shows one embodiment of this invention,
FIG. 1 is a cross-sectional view of the drilling water supply state, FIG. 2 is a cross-sectional view during chemical injection, and FIG. 3 is a cross-sectional view of the nozzle portion. 4... Inner tube, 2... Outer tube, 16, 19... Nozzle, 24, 31... Control mechanism, 1... Injection tube, 3
1...Ball valve, 24...Sleeve valve, 19
... Inner nozzle, 18 ... Guide lumen, 16 ... Outer nozzle.

Claims (1)

[Scope of utility model registration request] An inner tube for feeding a chemical solution and an outer tube sheathed to the inner tube via a conduit for feeding a drug solution each have an outer nozzle and an inner nozzle concentrically with respect to the side of the tube. In a drug liquid injection tube structure in which the inner tube faces the tip of the tube and a sleeve valve having an elastic spring is provided so as to be openable and closable with respect to the inner nozzle, the inner tube is later set into a throw-in type ball. The sleeve valve, which has a seat for the valve, is closed to the inner nozzle that communicates with the inner pipe when the ball valve is not closed, and opens when hydraulic pressure is applied to the inner pipe when the ball valve is closed. An outer nozzle is provided inside the inner nozzle so as to be openable and closable, and an outer nozzle, which communicates with the medicinal fluid channels of the outer tube and the inner tube and whose inner surface is tapered outward, is attached to the inner nozzle and is attached to the outer tube so that the depth can be adjusted freely. A chemical liquid injection pipe structure characterized by being threaded.