JP2889311B2 - Check valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a check valve for preventing backflow of a backfill material such as a segment or a propulsion pipe.

[Prior Art] There are a segment method, a propulsion pipe method, and the like as construction methods used for construction work of sewers, tunnels, and the like.

In these construction methods, in order to stabilize the segments, propulsion pipelines, etc. at the time of construction, a backfill material injection port provided in advance in the segments, propulsion pipes, etc. is used to fill the gaps between the segments, etc. and the ground side with backfill materials Fill with. At this time, a check valve is used to prevent the filled backfill material from flowing back into the segment.

A conventional backfill check check valve will be described with reference to FIGS. 6 and 7. FIG.

FIG. 6 is a diagram showing a section of a segment when buried underground.

Usually, an injection tube 60 having a female screw portion 62 is embedded in the segment 64 in advance. The backfill material 68 is injected at the inlet 70
The tip of an injecting agent press-fitting hose (not shown) is set and press-fitted. If the tip of the hose is removed from the inlet 70 after the press-fitting is completed, the backfill material that has been press-fitted up to now will flow backward and discharge into the pipe, not only losing the backfilling effect but also hindering work in the pipe. Therefore, the check valve 10 has been used.

FIG. 7 shows a conventional check valve. 2A is a plan view of the check valve, FIG. 2B is a sectional view taken along line LL, and FIG.
It is -K sectional drawing.

The conventional check valve 10 has a cylindrical main body 20 having a male screw portion 22 that is screwed with a female screw portion 62 of the injection tube 60 for fixing inside the injection tube 60, and a valve body fixed inside the cylindrical main body 20. Consists of 30.

The inner peripheral surface of the tubular main body 20 is formed such that the inner diameter on the backfill material delivery side is longer than the inner diameter on the backfill material supply side, and a closing step 21 is provided therebetween.

Two fitting receiving portions 23 are provided on the bottom surface of the tubular main body 20 (the backing material feeding side) and opposed in the diametrical direction of the tubular main body 20. The fitting receiving portion 23 has a concave cross-sectional shape and is open toward the backfill material delivery side, and a screw for fixing the fitting convex portion 30 of the valve body 30 to the fitting groove on the concave bottom surface. A hole 40 is provided.

The valve body 30 is integrally formed of an elastic material, and has a fitting protrusion 33 fitted inside the tubular main body 20, and the back surface of the fitting protrusion 33 centered on the fitting protrusion 33 via valve hinge portions 31 on both sides thereof. And a valve plate 32 that opens to the filling material delivery side.

The valve body 30 is arranged in the cylindrical main body 20 from the backing material delivery side of the cylindrical main body 20.
20 is inserted in the axial direction, and is fitted into the fitting receiving portion 23.
Is fixed to the tubular main body 20 by fitting the end of the cylindrical body with a screw hole 40 of the fitting receiving portion 23.

The valve plate 32 is attached so that its peripheral end is in close contact with the closing step 21 on the inner peripheral surface of the tubular main body 20.

A method of using the check valve 10 will be described. Inlet 70
The check valve 10 is screwed inside, the injection hose is set in the injection port 70, and the backfill material 68 is injected. In this case, the check valve 10 set inside the inlet 70 is elastically bent as shown by a broken line in FIG. Open on the mountain side). By this operation, the backfill material 68 is filled in the gap on the ground side between the closing step 21 on the inner peripheral surface of the cylindrical body 20 and the valve plate 32. When the injection of the backfill material 68 is completed, the pressure from the inside (injection side) becomes zero.
However, pressure from the opposite outside is applied to the valve plate 32. Valve plate
32 automatically closes due to the pressure, returns to the position of the closing step 21, and closes the flow path of the backing material 68, so that backflow of the backing material 68 into the segment pipe is prevented.

After the backfill material is injected, the porosity of the injection port is filled with mortar, and the check valve 10 is directly buried.

[Problem to be Solved by the Invention] The valve hinge portion 31 of the valve body 30 has a thin cross-sectional shape so as to have a function of elastically opening and closing. Therefore, if high pressure is applied from the outside (ground side),
The valve hinge 31 bulges inward (inside the segment) and breaks when the material strength of the valve hinge 31 reaches its limit.

Recent sewerage works and tunnel construction works are being performed in low places underground year by year. Along with this, the pressure received by the valve body 30 of the conventionally used check valve 10 also increases, and the valve hinge portion 31 is broken when the strength reaches the limit due to the pressure, and the function of the check valve 10 is lost. It is an accident at the same time.

An object of the present invention is to provide a check valve in which a valve hinge portion is not easily broken even when a high pressure is applied from the ground side.

[Means for Solving the Problems] The object of the present invention is to fix an injection pipe such as a propulsion pipe or the like, and to make the inside diameter of the backfill material delivery side part larger than the inside diameter of the backfill material delivery side part so that the closing step is formed. A tubular body having a fitting receiving portion formed and having a fitting groove provided on the inner surface of the backing material feeding side portion, and a fitting formed integrally with an elastic material and fitted inside the tubular body. And a valve plate that opens to the backing material delivery side via a valve hinge portion on both sides of the fitting convex portion, and the fitting convex portion is formed in the fitting groove of the fitting receiving portion. A valve body fixed to the tubular body by screwing the end of the tubular body, and a check valve for preventing backflow of a backfill material such as a propulsion pipe, wherein the tubular body is fitted. The receiving part has a concave cross-sectional shape including a screwed part, and the entire fitting protrusion of the valve body is fitted. The backing material delivery side upper surface which is passed in the diameter direction of the tubular main body is a valve hinge portion support surface which supports the entire backing material delivery side lower surface of the valve hinge portion. Achieved by a stop valve.

The above-mentioned object is achieved by fixing a fitting to an injection pipe such as a propulsion pipe, forming an inner diameter of the backfill material delivery side portion larger than an inner diameter of the backfill material delivery side portion to form a closing step, and having a fitting groove. A tubular main body having a receiving portion provided on an inner surface of the backing material feeding side portion, a fitting convex portion formed integrally with an elastic material and fitted inside the cylindrical main body, and the fitting convex portion; A valve plate that opens to the backing material delivery side via a valve hinge portion on both sides of the portion, wherein an end of the fitting convex portion is fitted into the fitting groove of the fitting receiving portion, and is screwed. A check valve for preventing backflow of a backfill material such as a propulsion pipe, wherein the fitting receiving portion includes:
A screw hole is provided on the bottom surface, and a screw stop portion having a concave cross section is provided at two locations in a diametrical direction of a center portion of an inner peripheral surface of the cylindrical body, and a concave cross section of the screw stop portion is provided. The two side walls of the □□ -shaped cross section excluding the bottom part project toward the center of the cylindrical main body, constitute the fitting receiving part integrally with the screw stopper part, and form the valve hinge part. This is achieved by a check valve characterized in that it is a valve hinge portion supporting surface that supports the lower surface of the backing material insertion side.

[Function] According to the present invention, the lower surface of the valve hinge portion on the backing material feeding side is supported by the valve hinge portion supporting surface on the backing material sending side upper surface of the fitting receiving portion of the tubular main body. The valve hinge of the check valve can be prevented from being broken even when a high pressure is applied to the check valve.

Embodiment A check valve according to a first embodiment of the present invention is shown in FIGS.
This will be described with reference to the drawings.

FIG. 1 is a view showing a cylindrical main body of a check valve according to a first embodiment of the present invention. FIG. 1A is a plan view of the tubular main body, FIG. 1B is a sectional view taken along line BB, FIG.
FIG. 4D is a bottom view.

A fitting receiving portion 24 is provided on the bottom surface of the tubular main body 20 (on the backfill material feeding side) and in the entire diametrical direction of the tubular main body 20. The fitting receiving portion 24 has a concave cross section and opens toward the backfill material delivery side. Screw holes 40 for fixing the fitting projections 33 of the valve body 30 are provided at both ends on the bottom surface of the fitting receiving portion 24.

FIG. 2 is a view showing a valve body of a check valve according to a first embodiment of the present invention. FIG. 2A is a plan view of the valve element as viewed from the backfill material feeding side, FIG. 2B is a sectional view taken along line DD, FIG. 2C is a sectional view taken along line CC, and FIG. Is a bottom view.

The valve body 30 is formed integrally by injection molding or the like with an elastic material such as nylon and polyester, which is flexible and rich in elasticity, and has a fitting convex portion 33, and a valve hinge portion 31 on both sides of the fitting convex portion 33 as a center. And a valve plate 32 that opens to the backfill material delivery side via the valve.

FIG. 3 is a view showing the check valve in a state where the tubular main body shown in FIG. 1 and the valve body shown in FIG. 2 are assembled. FIG.
Is a plan view of the check valve as viewed from the backfill material feeding side, FIG. 4B is a sectional view taken along line FF, FIG. 4C is a sectional view taken along line EE, and FIG. It is a cross-sectional view of a receiving part.

The valve body 30 is arranged in the cylindrical main body 20 from the backing material delivery side of the cylindrical main body 20.
20 is inserted in the axial direction, and is fitted into the fitting receiving portion 24.
Is fixed to the cylindrical main body 20 by fitting the entire bottom surface and both side surfaces of the cylindrical body 20 with screws in the screw holes 40 of the fitting receiving portion 24.

The upper surface of the fitting receiving portion 24 on the backing material delivery side is a valve hinge portion.
The valve hinge portion 31 is in contact with the entire lower surface of the backing material feeding side, and is supported by the upper surfaces (valve hinge portion support surfaces) of both side walls 24a and 24b of the fitting receiving portion 24. Therefore, even if a large pressure is applied from the outside (the backfill material delivery side), the valve hinge
31 does not bend and break. Further, since the fitting projection 33 is held by the fitting groove bottom surface 24c of the fitting receiving portion 24, after the check valve is attached, the fitting receiving portion 24 and the fitting projection are formed.
33 is integrated with the screw to provide the effect as a rib for reinforcing the check valve, so it is excellent in strength.

The fitting receiving portion 24 is also used as a handle for screwing the check valve 10 in the work of attaching the check valve 10 to the injection pipe 60.

According to this embodiment, since the valve hinge is supported by the valve hinge supporting surface of the fitting receiving portion as described above, the valve hinge is not damaged even when a large pressure is applied from the backfill material delivery side. Can be prevented. Therefore, it is possible to provide a check valve in which the valve hinge portion is not damaged even under high pressure received in a deep place underground.

The method of attaching the check valve to the injection port, the method of injecting the backfill material, and the opening and closing operation of the valve plate after the injection are the same as those of the conventional method shown in FIG. In addition, a check valve that does not impair the elastic opening / closing function of the valve hinge portion can be provided while maintaining a structure that does not hinder backfilling material injection work.

A check valve according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2A is a plan view of the check valve as viewed from the backfill material feeding side, FIG. 2B is an HH sectional view, FIG. 1C is a GG sectional view, and FIG. d) is a cross-sectional view of the overhang.

On the bottom surface of the cylindrical body 20 (the backfill material feeding side), the fitting receiving portion 25 is opposed to the center of the inner peripheral surface of the cylindrical body 20 in the diametrical direction.
Is provided. The fitting receiving portion 25 has a concave cross-sectional shape, and has a screw hole 40 on the bottom surface.

In the fitting receiving portion (screw fixing portion) 25, side walls 25 a and 25 b having a concave cross section provided opposite to the inner peripheral surface of the cylindrical main body 20.
However, each extends toward the center of the tubular main body 20 to a position near the center of the tubular main body 20 to form an overhang portion 26. The cross section of the side walls 26a, 26b of the overhang portion 26 is formed in a □□ shape. The upper surfaces of the side walls 26a and 26b of the overhang portion 26 on the backing material sending side and the upper surfaces of the side wall 25a and 25b of the fitting receiving portion 25 on the backing material sending side are in contact with the lower surface of the backing material sending side of the valve hinge portion 31. I have.

The valve body 30 is integrally formed of an elastic material, and has a fitting projection 33 fitted inside the tubular main body 20, and the fitting projection 33 as a center, on both sides via a valve hinge part 31, And a valve plate 32 that opens to the filling material delivery side.

The valve body 30 is arranged in the cylindrical main body 20 from the backing material delivery side of the cylindrical main body 20.
20 is inserted in the axial direction, and is fitted into the fitting receiving portion 25.
Are fixed to the tubular main body 20 by screwing in the screw holes 40 of the insertion receiving portion 25.

The upper surface of the backfill material delivery side of the side walls 26a, 26b of the overhang portion 26 and the upper surface of the backfill material delivery side of the side walls 25a, 25b of the fitting receiving portion 25,
The valve hinge portion 31 is supported as a valve hinge portion support surface that is in contact with the lower surface of the valve hinge portion 31 on the backfill material feeding side. Therefore, even when a large pressure is applied from the outside (the backfill material delivery side), the valve hinge portion 31 does not bend and break.

The overhang portion 26 is also used as a handle for screwing the check valve 10 in the work of attaching the check valve 10 to the injection pipe 60.

According to the present embodiment, since the two projecting portions 26 are separated from each other at the center, unnecessary stress is not generated even when the cylindrical main body 20 is integrally molded, so that the cylindrical main body 20 may be distorted. Absent.

A check valve according to a third embodiment of the present invention will be described with reference to FIG. FIG. 2A is a plan view of the check valve as viewed from the backfill material feeding side, FIG. 2B is a JJ cross-sectional view, FIG. 1C is a II cross-sectional view, and FIG. d) is a cross-sectional view of the overhang.

The present embodiment is characterized in that the projecting portion 26 projecting from the opposite fitting receiving portion 25 extends over the entire length in the diameter direction of the cylindrical main body 20, and has a cross section formed in a □□ shape.

By doing so, the fitting receiving portion (screw fixing portion) 25
The upper surface of the backing material sending side (part hinge portion supporting surface) of the overhanging portion 26 contacts the entire lower surface of the backing material sending side of the valve hinge portion 31 and supports the valve hinge portion 31. However, the valve hinge portion 31 is not damaged.

The present invention is not limited to the above embodiment, and various modifications are possible.

For example, the cross-sectional shape of the fitting receiving portion may be not only a concave shape but also a V shape, a U shape, or a semicircular shape.

Further, the fitting receiving portion in this embodiment has the fitting groove formed in the closing step, but the groove may not be formed in the closing step as in the conventional example.

[Effects of the Invention] As described above, according to the present invention, the lower surface of the backing material feeding side of the valve hinge portion is supported by the valve hinge portion support surface of the upper surface of the backing material sending side of the fitting receiving portion of the tubular main body. The support can prevent the valve hinge of the check valve from being broken even when receiving a high pressure from the ground side.

[Brief description of the drawings]

FIG. 1 is a view showing a tubular main body of a check valve according to a first embodiment of the present invention, FIG. 2 is a view showing a valve body of a check valve according to a first embodiment of the present invention, FIG. Is a view showing a check valve according to a first embodiment of the present invention, FIG. 4 is a view showing a check valve according to a second embodiment of the present invention, and FIG. 5 is a view according to a third embodiment of the present invention. FIG. 6 shows a check valve, FIG. 6 is a cross-sectional view of a use state of a check valve attached to an injection pipe in a segment, and FIG. 7 is a view showing a conventional check valve. In the drawing, 10 ... check valve 20 ... cylindrical body 21 ... closing step 22 ... male screw part 23 ... fitting receiving part 24 ... fitting receiving part 24a, 24b ... fitting receiving part side wall 24c ... fitting groove bottom surface 25: Fitting receiving part (screw fixing part) 25a, 25b: Fitting receiving part side wall 26 ... Projection part 26a, 26b ... Projection part side wall 30 ... Valve element 31 ... Valve hinge part 32 ... Valve plate 33 ... Fitting convex part 40 ... screw hole 60 ... injection pipe 62 ... female screw part 64 ... segment 66 ... ground 68 ... backfill material 70 ... injection port

Claims (2)

(57) [Claims] 1. A closing step is formed by fixing an inner diameter of a backfill material delivery side portion larger than an inner diameter of a backfill material delivery side portion, which is fixed to an injection pipe such as a propulsion tube, and has a fitting groove. A tubular main body having a fitting receiving portion provided on the inner surface of the backing material feeding side portion; a fitting convex portion formed integrally with an elastic material and fitted inside the tubular main body; A valve plate that opens to the backing material delivery side via a valve hinge portion on both sides of the convex portion; an end of the fitting convex portion is fitted into the fitting groove of the fitting receiving portion; A check valve for preventing backflow of a backfill material such as a propulsion pipe, wherein the fitting receiving portion of the tubular body has a screw stop portion. The full length transverse section including the concave shape is a concave shape, the entire fitting convex portion of the valve body is fitted, and in the diametric direction of the cylindrical main body. Is, back-filling material delivery side upper surface, a check valve, wherein the valve is a valve hinge portion support surface for supporting the back-filling material feeding inlet side the entire lower surface of the hinge portion. 2. A backing member fixed to an injection pipe such as a propulsion pipe and having an inner diameter of a backfill material sending side portion larger than an inner diameter of a backfill material sending side portion, a closing step is formed, and a fitting groove is provided. A tubular main body having a fitting receiving portion provided on the inner surface of the backing material feeding side portion; a fitting convex portion formed integrally with an elastic material and fitted inside the tubular main body; A valve plate that opens to the backing material delivery side via a valve hinge portion on both sides of the convex portion; an end of the fitting convex portion is fitted into the fitting groove of the fitting receiving portion; A check valve for preventing backflow of a backfill material such as a propulsion pipe, wherein a screw hole is provided in a bottom surface of the fitting receiving portion. A screw stop having a concave cross section is provided at two locations in the center of the inner peripheral surface of the cylindrical main body in the diametrical direction. Except for the bottom of the concave cross-section of the screw stopper, the both side walls of the □□ -shaped cross-section project toward the center of the cylindrical main body, and are integrally formed with the screw stopper in the fitting receptacle. A check valve comprising a valve hinge portion supporting surface for supporting a lower surface of the valve hinge portion on the back material insertion side.