JPH0519376Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology belongs to the field of structural technology for solidifying agent injection pipes for improvement work on soft ground in reclaimed land such as coasts and rivers.

<Summary> This invention has a bit made of industrial diamond or the like at the tip of the tube, and an injection nozzle is installed horizontally on the upper side wall and connected to the liquid passage inside the tube. This invention relates to a grout injection pipe structure in which a pressure-responsive valve is interposed between an injection nozzle and a liquid passage in the pipe. A slider that slides on the inner wall surface of the tube to change the injection nozzle from a closed state to an open state, and a slider provided in the slider that opens the liquid passageway of the slider and the liquid passageway inside the tube by changing pressure in the liquid passageway inside the tube. It consists of a valve body that changes the state from the closed state to the closed state, and the flexible pin is placed horizontally in the liquid passage in the pipe and applied a pressing force by a push plug inserted from the top, at the top of the injection nozzle. This invention relates to a grout injection pipe structure in which a valve body is suspended and connected via a rod.

<Prior art> As is well known, effective use of land is an extremely important issue in Japan, which has a small area, and therefore, effective use of land by reclaiming coasts, rivers, lakes, etc. is extremely beneficial in terms of national land construction. Various studies have been conducted on such soft ground improvement techniques and have been put into practical use.

Therefore, various types of construction work on the ground include not only the above-mentioned ground improvement work, but also various construction works such as building water-stop walls in the ground, and these works require techniques to inject improvement agents such as water glass into the ground. is widely used, and generally a grout is injected by drilling a hole into the ground and injecting the grout.During the drilling, drilling water is injected to reduce the drilling resistance. Grout is injected after drilling to a predetermined depth, but compared to injecting grout axially from the tip of the injection tube, grout is injected laterally from the injection nozzle installed on the side of the injection tube. An efficient construction method is widely used in which the injection pipe is rotated and raised while mixing with the soil in the ground and causing a consolidation reaction.

During drilling, drilling water is injected from the tip bit, and grout is injected laterally from the injection nozzle, so it is necessary to switch between the drilling water and grout in the liquid passage inside the injection pipe. There is a need to do.

<Problems that the invention aims to solve> And, in conventional grout injection pipes, two liquid passages, one for supplying drilling water and the other for pumping grout, are connected to the tip. The disadvantage is that the structure becomes complicated by adopting a double-tube structure, or by providing a switching valve for each of these passages, and the injection tube becomes large in diameter, increasing the weight of the entire device and reducing power consumption. There is a disadvantage that it requires a large amount of
In addition, the switching valve for the injection nozzle when switching and injecting drilling water and grout for one fluid passage is a pressure-responsive valve, and the pressure-responsive valve is activated by inserting a ball or the like to cut the sear pin when switching. The shear pins must be replaced when the injection tube is used repeatedly, which is extremely cumbersome, and the number of shear pins is large, resulting in high costs and poor work efficiency. There was an inconvenience that it was bad.

<Purpose of the invention> The purpose of this invention is to solve the problems of grout injection pipes used for soft ground improvement work based on the above-mentioned conventional technology as a technical problem to be solved, and to ensure that all equipment parts can be repeated as they are for each construction. It can be used to reduce running costs, and when drilling, it is possible to smoothly feed drilling water, and it is possible to inject horizontally from a predetermined depth through the grout injection nozzle. It is an object of the present invention to provide an excellent grout injection pipe structure that can reliably perform switching injection of grout, thereby benefiting the field of ground improvement technology application in the construction industry.

<Means/effects for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem. When drilling a hole to a predetermined depth while connecting the pipe through a unit joint, the drilling water fed into the liquid passage inside the pipe flows through the flexible pin and rod part, and connects with the valve body of the pressure-responsive valve. The liquid passes between the sliders that block the injection nozzle, passes through the liquid passage of the slider, and is ejected from the tip of the bit to smoothly drill the hole. When the predetermined depth is reached, the push plug is inserted from the ground into the inner pipe of the double pipe section. The inserted push plug comes into contact with the flexible pin of the fluid passage in the pipe and is under pressure, bending the flexible pin and lifting the rod suspending the valve body. As the grout is lowered, the valve body closes the liquid passage in the slider, and the slider and the valve body are integrated into a pressurized state.Therefore, when the grout is continuously fed, it flows through the liquid passage in the pipe. The grout presses the pressure-responsive valve integrated with the valve body and slider to open the injection nozzle and close the liquid passage in the pipe communicating with the bit part, so that the grout is fed into the liquid passage in the pipe. The grout is injected into the ground on the side from an injection nozzle at a predetermined pressure, and is mixed with the soil in the ground by a rotating and rising injection pipe to solidify it.

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

Although they are integrally connected at the cut-off hatched part of the tube end in FIGS. 1 and 2, for convenience of illustration, the tube will be explained as being divided into two parts.

Also, although the tube body is actually in the vertical direction,
For convenience of illustration, it is shown horizontally.

As shown in the figure, the grout injection pipe 1, which forms the center of the gist of this invention, has multiple stages of threaded joints 2,
A check ball 5 is urged to close to a seat 6 via an elastic spring 4 just above the bit 3 at the tip. A seat 7 is provided to form a cylinder portion 8, and a liquid passage 9 in the pipe is communicated and extended to the upper part.

A set number of horizontal injection nozzles 10, 10, .

A spindle type slider 11 is provided inside the cylinder part 8 so as to be able to slide freely to open and close the injection nozzle 10, and inside there is a liquid passage 12 communicating with the liquid passage 9 in the tube and its upper part. A tapered liquid passageway 13 is formed.

In addition, 14 is an O-ring, which aims at sealing the slider 11 and the inner wall of the cylinder portion 8.

Inside the tapered liquid passage 13, a valve body 15 with the tapered liquid passage 13 as its seat is movable up and down in the slider 11 via a rod 16, and in the open state, the valve body 15 is seated in the tapered liquid passage 13. As shown in FIG. 2, the liquid passages 9 in the upper and lower pipes are communicated via the tapered liquid passage 13 and the liquid passage 12, and the valve body 15 is connected to the tapered liquid passage 13. In the lowered state of contact, the liquid passage 12 is closed and the liquid passages 9, 9 in the upper and lower tubes are cut off.

The slider 11 and the valve body 15 constitute a pressure-responsive valve 17.

Moreover, the liquid passages 9, 9 in the pipe at the upper part of the cylinder part 8
A chiyoke portion 18 is formed between them.

In the upper part of the yoke part 18, a liquid passage 9 in an upper pipe is formed in a mixing part 19, and is connected to an ejector part 20 in the upper part.

Note that the single pipe section 21 is below the ejector section 20.
The upper part is a double pipe part 22, and directly above the ejector part 20, a liquid passage 9 in the inner pipe and a liquid passage 9' in the outer pipe are formed. A unit double pipe (not shown) is connected through the joint 2'.

Then, the sleeve 2 at the upper part of the ejector part 20
3 is the upper sleeve 2 via the joint part 2'.
As shown in FIG. 3, a notch 25 is disposed horizontally between the two, and a flexible pin 26 made of spring steel and having a square cross section is inserted and engaged. 27 is fitted and connected to the valve body 15 of the pressure-responsive valve 17 via a rod 28, thereby suspending the valve body 15.

Therefore, the flexible pin 26 can be installed and reassembled by disassociating and coupling the sleeves 23 and 24, and the flexible pin 26 is bent downward by the set pressing force and inserted into the pipe inside the sleeve 23. It is designed so that it can slide down into the liquid passageway 19 of.

When a push plug 30, which is inserted from above into a liquid passageway in a pipe of a unit double pipe (not shown) connected to the upper part of the sleeve 24, is inserted into a liquid passageway 9 in a pipe in the sleeve 24, a pressure is applied. condition appears and presses the flexible pin 26, and the pressing force causes the flexible pin 26 to bend downward and release the sleeve 2.
3, the valve body 15 of the pressure-responsive valve 17 is seated on the tapered liquid passage 13 in the slider 11 via the rod 28, and the pressure-responsive The cylinder part 8 is slid down with the valve 17 in a pressurized state, and is seated on the seat 7 to put the inside of the cylinder part 8 in a pressurized state, and grout is poured from the injection nozzles 10, 10, . . . which are opened by sliding the slider 11 down. is injected into the ground.

Incidentally, predetermined different kinds of grouts are fed to the liquid passages 9, 9 in the inner and outer pipes of the unit double pipe connected to the upper part of the sleeve 24.

<Embodiment - Effect> When carrying out a prescribed ground improvement work in the above-described configuration, in order to use the injection pipe 1 to penetrate the ground and drill a hole to a predetermined depth, it is necessary to insert a double pipe into the single pipe part 21. Unit double pipes (not shown) are successively screwed into the part 22 via the joint 2' and holes are drilled while making a predetermined length. On the other hand, when drilling water is supplied,
Since the push plug 30 is not inserted, the drilling water flows through the liquid passages 9, 9, . The tapered liquid passage 13 between the valve body 15 and the slider 11 is not bent when no pressure is applied, and therefore the rod 28 and the valve body 15 are suspended without being lowered. The open state is maintained, so the pressure-responsive valve 17 does not go down, and all the liquid passages 9, 9... in the pipe from the top to the bit 3 are in communication, so the drilling water flows straight. The pressure pushes down the check ball 5 against the elastic spring 4,
It is ejected from the bit 3 to assist drilling by the bit 3 and smoothly drill the hole to a predetermined depth.

Of course, as mentioned above, during this time, the pressure-responsive valve 17 is in the cylinder section 8, and the injection nozzle 10,
10... is blocked, the injection nozzle 1
From 0, 10..., drilling water does not spout to the side.

Then, when a predetermined depth is reached, the drilling is stopped, and when starting the injection of grout into the ground, when the push plug 30 is introduced from the ground into the liquid passage 9 in the inner pipe of the unit double pipe, the push plug 30 is continuously lowered to lower the sleeve 24 of the injection tube 1.
The flexible pin 26 is brought into contact with the liquid passageway 9 in the tube of the sleeve 24, and the liquid passageway 9 in the tube of the sleeve 24 is temporarily closed.

Therefore, when grout (not shown) is fed from the ground, the grout pressure in the liquid passage 9 in the pipe of the sleeve 24 increases, and the push plug 30 moves from the flexible pin 26.
By pressing the flexible pin 26, the flexible pin 26 is bent into a substantially U-shape due to the elasticity of the spring steel, moves within the liquid passage 9 in the pipe inside the sleeve 23, and descends. Then, the valve body 15 of the pressure-responsive valve 17 also descends, and finally sits on the tapered liquid passage 13 of the slider 11.

During that time, the push plug 30 in the sleeve 24 is moved by the pressure of the grout into the liquid passage 9 in the pipe.
Flexible pin 2 that descends inside and then bends and descends
6 and descends in the liquid passage 9 in the pipe inside the sleeve 23, and because the liquid passage 9 in the pipe in the sleeve 23 has a larger diameter than the liquid passage 9 in the pipe in the sleeve 24, The grout in the liquid passage 9 is ejected into the ejector part 20, and together with the ejector of other grout in the outer tube, it is ejected from the ejector part 21 into the mixing part 19 and diffused, and the grout is rapidly stirred and mixed. The liquid passes through the tube and is squeezed by the cheese yoke 18, and is further diffused into the liquid passageway 9 in the pipe at the bottom to be mixed more uniformly.
5 is integrated with the slider 11 and closes the tapered liquid passage 13, so the liquid passage 12 and the liquid passage 9 in the pipe are blocked, and the pressure-responsive valve 17 is closed to the grout. As a result, the cylinder part 8 is brought into a pressurized state, and the cylinder part 8 is slid down to sit on the seat 7.

In this process, in order for the slider 11 to change the injection nozzles 10, 10, .
It is injected horizontally into the ground from 0, 10, and is uniformly stirred and mixed with the soil in the ground by the injection pipe 1 that rotates upward.

Then, the injection tube 1 is rotated upward while sequentially disassociating the unit double tubes at the upper part, and the continuously supplied grout is poured into the liquid passages 9 inside and outside the double tube.
The mixture is uniformly mixed and stirred repeatedly in the ejector section 20, mixing section 19, and chiyork 18 to reach a homogeneous state, and is then poured into the ground and mixed with the soil, solidifying the ground over time.

In this way, predetermined ground improvement and water-stop walls are formed.

Then, when the ground improvement in a predetermined area is performed, each joint 2, 2 in the injection pipe 1 that has been pulled out is
When the injection tube 1 is disassembled by dissociation, the flexible pin 26 is again placed across the notch 25 between the sleeves 23 and 24, reset to the initial position, and used again for the next ground improvement.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted, such as interposing an elastic spring between the lower seat of the pressure-responsive valve and the like. .

Further, as a design change, the cross section of the flexible pin can be made circular or bar-shaped.

In addition, it goes without saying that it is possible to feed grout only to the inner pipe section of the double pipe section during use. In grout injection pipes used for ground improvement work, etc., the grout is spouted from the injection nozzle formed horizontally on the side wall at the top of the bit, which has the effect of improving improvement efficiency. By switching the pressure-responsive valve, drilling water can be injected from the bit part during drilling, and grout can be injected sideways from the injection nozzle when the injection pipe is raised.

Since the pressure-responsive valve is formed with a slider that opens and closes the injection nozzle and a valve body that moves up and down to freely open and close the liquid passage that communicates with the liquid passage in the upper and lower pipes, the valve body is attached to the slider. In the open state, the slider closes the injection nozzle and the drilling water supplied to the liquid passage inside the pipe can be spouted from the bit, and the valve body is installed horizontally in the liquid passage inside the upper pipe. Since it is connected to the flexible pin via a rod, drilling water can be supplied smoothly unless a push plug is inserted into the flexible pin from above and it becomes pressurized by grout. During the improvement, the push plug is inserted from the ground, pressed against the flexible pin, brought under pressure, bends the flexible pin, and descends with the rod, thereby integrating the valve body into the slider as described above. The effect is that the pressure-responsive valve moves down to open the injection nozzle and allow grout to be injected laterally.

Also, unlike sear pins, flexible pins bend and descend, so after improvement they can be reset for the next improvement work, which reduces running costs and improves work efficiency. It is carried out smoothly and has the excellent effect of shortening the construction period and reducing costs.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of one embodiment of this invention, in which Fig. 1 is a partial cross-sectional view of the injection tube, Fig. 2 is a partial cross-sectional view of the same, and Fig. 3 is a cutaway perspective view of the connecting part of the flexible pin. It is a diagram. 3...Bit, 10...Injection nozzle, 9...Liquid passage in the pipe, 17...Pressure responsive valve, 1...Injection pipe, 11...Slider, 12, 13...Liquid passage, 15... Valve body, 30... push plug, 26... flexible pin, 28... rod.

Claims (1)

[Scope of utility model registration request] In a grout injection pipe structure in which a pressure-responsive valve is interposed between an injection nozzle provided on the upper side wall of the injection nozzle and a liquid passage in the pipe, the pressure-responsive valve opens and closes the injection nozzle. and a valve body that opens and closes the liquid passage of the slider connected to the liquid passage in the pipe, and a flexible pin that is placed horizontally in the liquid passage in the upper pipe and is pressed by a push plug. A grout injection pipe structure characterized in that the valve bodies are connected via a rod.