JPH0247417A - Check valve device for casing - Google Patents

Abstract

PURPOSE:To prevent a sleeve from being positionally shifted and being damaged by setting the rubber sleeve in a space formed between a casing and a coupling which are spirally fitted to each other. CONSTITUTION:In a check valve device consisting of a casing 1 and a coupling 2, in the innermost sections of thinner sections 12 formed at the respective end sections of the casing 1, a female screw is formed, and on the peripheral surfaces of the respective thinner sections 12, a plurality of injection slots 11 are opened to be arranged. The coupling 2 consists of a large diameter section 22 with the outer diameter equal to that of the casing 1, small diameter sections 23 positioned at both the ends of the large diameter section 22, and injection slots 21 opened on the peripheral surfaces of the small diameter sections 23. On the outer peripheries of the small diameter sections 23, male screws to be spirally fitted on the casings 1 are opened to be arranged, and in spaces 3 formed between the casings 1 and the coupling 2 which are spirally fitted on each other, rubber sleeves 4 are positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to check valve devices for casings, rock bolts, and sleeve pipes used in pipe roof construction methods, rock bolt construction methods, chemical injection construction methods, and the like.

<Prior art> A construction method in which a steel pipe, etc. is inserted into a hole drilled in the ground for the purpose of reinforcing or improving another mountain, and mortar or chemical solution is injected.
The by roof construction method, the rock bolt construction method, and the chemical injection construction method are known.

We will briefly explain the mortar and chemical injection methods used in each construction method.

[Vibe roof construction method] After penetrating a zero-perforation pipe into the ground, a cap is attached to the mouth of the pipe, and a consolidating material is injected into the pipe, and cement milk is discharged from the tip of the pipe to coat the inside and outside of the pipe. How to inject into.

[Rock bolt construction method] A method in which a zero-boring rock bolt is penetrated into the ground, and then the fixing material is injected from the tip of the bolt, or from the mouth.

[Chemical injection method 1 (Fig. 9) A pipe C is used which has an injection hole a on its circumferential surface and a rubber sleeve b attached around the injection hole a.

Then, a packer (not shown) is inserted into the pipe C to block the inner space of the pipe C, and a chemical solution is injected at high pressure into this limited space, thereby partially injecting the chemical solution into the ground.

<Problems to be Solved by the Present Invention> Each of the injection methods described above has the following problems.

(a) In the bi-roof construction method, since the cement is injected only from the tip of the pipe, it is difficult to uniformly infiltrate the solidifying material over the entire length of the pipe.

Furthermore, it is impossible to inject the consolidation material into the hole from the middle of the pipe.

In the case of the <mouth> rock bolt construction method, the fixing material is injected only from the tip or mouth of the rock bolt, so there is a problem that the penetration range of the fixing material is narrow.

The disadvantage is that it is easy to receive.

This inconvenience is also common to the rock bolt construction method, which uses rock bolts covered with sleeves.

<Object of the present invention> The present invention has been made in view of the above points, and an object of the present invention is to provide the following casing check valve device.

<A> Casing check valve device that protects the sleeve.

<mouth> A highly versatile casing check valve device that can be applied to various construction methods.

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, a case where the method is applied to a pie roof construction method will be explained as an example.

<A> Check valve device An example of a check valve device is shown in Fig. 1.2.

The check valve device according to the present invention has a rubber sleeve 4 located in a space 3 formed between the threaded portion of the casing 1 and the coupling 2, and opened on the circumferential surfaces of the casing 1 and the coupling 2. It is configured so that a chemical solution can be discharged from the injection hole 11.21.

Each part will be explained in detail below.

<Exposure> Casing The casing 1 is a cylindrical body with both ends open, and a female thread is carved deep into the thin walled portion 12 formed at each end, and a plurality of threads are formed on the circumferential surface of each thin walled portion 12. The injection hole 11 has now been opened.

Also, when actually using the casing 1, the injection hole 11
In order to prevent water and dirt from entering, the injection hole 11 is filled with elastic resin such as sponge, clay, etc.

<C> Coupling The coupling 2 is a cylindrical body that connects the casings 1, and includes a large diameter portion 22 having an outer diameter equal to that of the casing 1, a small diameter portion 23 located at both ends of the large diameter portion 22, and a small diameter portion 23 located at both ends of the large diameter portion 22. It consists of an injection hole 21 opened on the circumferential surface of a portion 23.

A male thread for screwing into the casing 1 is carved on the outer periphery of the small diameter portion 23.

The male thread is carved in the entire area excluding a section that is approximately equal to the width of the sleeve 4 from the position closest to the large diameter portion 22.

A plurality of injection holes 21 are provided on the circumferential surface of the small diameter portion 23 which is not threaded.

When the small diameter portion 23 of the coupling 2 is screwed onto the casing 1, an annular space 3 is formed outside the injection hole 21.

The space 3 only needs to have an area that is at least large enough to allow elastic deformation of the sleeve 4.

Note that 24 is a water-stop sealing material attached to the outer periphery of the end of the small diameter portion 23.

<2> Sleeve The sleeve 4 is made of a ring-shaped elastic material, and is given appropriate elasticity so that it does not undergo elastic deformation due to the water supply pressure during drilling, but is elastically deformed due to the injection pressure during injection of the chemical solution.

<E> About the opening position of the injection hole When the casing 1 and the coupling 2 are screwed together as shown in the enlarged view in Fig. 2, if the center of the bipolar injection hole 11.21 is slightly shifted in the axial direction, The chemical solution can be discharged smoothly.

In some cases, the centers of the bisexual holes 11 and 21 are formed to coincide with each other.

<Operation><A> During drilling (Fig. 2) When using the internal space of casing 1 as a water supply channel,
The water supply pressure passes through the injection hole 21 of the coupling 2 to the sleeve 4.
It acts on the inner surface of the body.

Since the sleeve 4 has elasticity that does not undergo elastic deformation due to water supply pressure, it closes the outside of the injection hole 21 without being elastically deformed, thereby preventing water leakage.

<Port> When injecting a chemical solution (Fig. 3) When inserting the inner tube 6 covered with the packer 5.5 into the casing 1 and injecting the drug solution, the backer 5 is inserted from the discharge hole 51 of the inner tube 6. The chemical liquid is discharged at high pressure into the space partitioned by .5.

Thereafter, the chemical liquid flows into the space 3 through the injection hole 21 of the coupling 2 by elastically deforming the sleeve 4, and is discharged from the injection hole 11 of the casing 1 to the other side.

(2) When no pressure is applied When no pressure is applied within the casing 1, the sleeve 4 closes the injection hole 21 of the coupling 2 to reliably prevent groundwater and earth from entering.

<Other Embodiment 1> (FIG. 4) The injection hole 11 of the casing 1 may be formed into a notch or an elongated hole cut out to the end of the casing 1.

<Other Embodiment 2> (Fig. 5) The check valve device may be formed directly at the threaded portion of the casing 1.1 without intervening a coupling.

That is, a female thread is cut deep into a thin wall portion formed at one end of the casing l, and a plurality of injection holes 11 are formed on the circumferential surface of each thin wall wall.

Then, a thread is carved on the outer periphery of the other end of the casing 1, and an injection hole 1 is carved on the part of the peripheral surface where the male thread is not carved.
1 is opened, and an elastic sleeve 4 is wrapped around the injection hole 11.

When the male and female threads of the casing 1.1 are screwed together, an annular space 3 can be formed between the screwed parts.

According to this embodiment, the same function as in the previous embodiment can be achieved without using the coupling 2.

Note that the injection holes 11.11 of both casings 1.1 are formed with their centers shifted from each other, as in the previous embodiment.

<Other implementations V1413> (Fig. 6) Also, when connecting the tubes 7 and 7 with screws at their ends and screwing the sockets 8 to these ends, these screws can be used. It is also possible to form a check valve device at the joint.

That is, the outer periphery of the end of one tube body 7 is recessed with approximately the same width as the sleeve 4, and the injection hole 71 is opened in this recess, and the sleeve 4 is covered.

On the other hand, an injection hole 81 is opened in the center of the socket 8.

When the tubular bodies 7.7 are screwed onto both ends of the socket 8, an annular space 3 can be formed between the screwed parts.

When this embodiment is applied to the rock bolt construction method, it not only becomes possible to inject the fixing material from the middle of the rock bolt, but also has the advantage of expanding the injection range of the fixing material.

<Other Embodiment 4> (Fig. 7.8) In the above embodiment, the case where a check valve device is formed at the joint by screwing two pipe bodies is explained.
．． It is also conceivable to form a check valve device between the joint parts when the parts 7 are joined by welding.

In this embodiment, since the tubular bodies 7.7 are joined by welding, it is not suitable for applications in which impact force in the axial direction is applied, but it is suitable for applications in which only rotation is applied for insertion.

<Effects of the Present Invention> Since the present invention is as explained above, the following effects can be obtained.

(a) Since the sleeve is housed inside the casing, it is possible to prevent the sleeve from shifting or being damaged during use.

Therefore, perforations can be made in the casing at the end of the sleeve.

<mouth> When applied to the vibrator roof method, consolidation material can be injected from the middle of the vibrator toward other peaks.

Therefore, the consolidation material can be evenly injected into the holes.

<C> When applied to the rock bolt construction method, the fixing material can be injected into the ground from the middle of the rock bolt.

Therefore, compared to the conventional method, the penetration range of the fixing material can be expanded.

[Brief explanation of the drawing]

Figure 1: An exploded perspective view of the check valve device. Figure 2: An enlarged cross-sectional view of a part of the assembled part. Figure 3: A partial cross-sectional view of the upper half of the check valve device when injecting a chemical solution. Figure 4: View of the casing. Partially enlarged cross-sectional view of another example of opening an injection hole Fig. 5: Explanatory diagram of another embodiment in which a check valve device is formed between the threaded parts between the casings Fig. 6: Check valve device formed between the threaded parts between the casings Explanatory diagram of another embodiment of forming a valve device Figure 7.8: Explanatory diagram of another embodiment of forming a check valve device between the welded parts of the pipe body Figure 9: Illustration of a conventional check valve device Explanatory diagram

Claims (3)

[Claims] (1) A casing in which a female thread is carved deep into a thin wall formed at the end of a cylindrical body with both ends open, and multiple injection holes are opened on the circumferential surface of each thin wall, which is equivalent to a casing. A small diameter part with a thread carved on both ends of the large diameter part of the outer diameter is located, and an injection hole is opened on the circumferential surface of the small diameter part with no male thread carved. A casing check valve device consisting of a coupling surrounded by an elastic sleeve, with an annular space formed around the sleeve between the threaded part of the casing and the coupling. (2) A female thread is carved into the depths of the thin walled portion formed at one end of the casing with both ends open, and a plurality of injection holes are formed on the circumferential surface of each thin walled portion, and the outer periphery of the other end of the casing. At the same time, an injection hole is formed in a part of the peripheral surface where the male thread is not formed, and the injection hole is surrounded by an elastic sleeve, and the threaded part of the casing is A casing check valve device with an annular space formed around a sleeve between the two. (3) An annular space is formed between the joint parts of both pipe bodies, between the joint parts where the ends of the pair of pipe bodies are fitted and the outer peripheries of these pipe bodies are welded, and the space is A non-return check for a casing, in which an injection hole is formed on the peripheral surface of a pair of tubes facing the inner tube, and an elastic sleeve is wrapped around the injection hole in the inner tube to allow elastic deformation. Valve device.