JP6873835B2 - Check valve - Google Patents

Description

The present invention relates to a check valve, and more particularly to a check valve mounted in a grout material injection hole provided through a pipe wall of an embedded pipe.

In propulsion work in underground tunnel construction, after the completion of propulsion, in order to prevent subsidence due to loosening of the ground in the overcut part during excavation, a backing material, which is a grout material, is used between the propulsion pipe and the ground. Make an injection. Then, in such propulsion work, it is necessary to confirm whether or not the backing material is properly filled in the tail void between the propulsion pipe and the ground after the backing material is injected.

Currently, as this confirmation method, it is determined that the filling is properly completed when the injection pressure of the backing material reaches a predetermined value, or that the filling is properly completed when the injection amount reaches a predetermined amount. Deciding.

However, in reality, even if the injection pressure of the backing material reaches a predetermined value, it may disperse into the soil and not be sufficiently filled in the tail void, or even if a predetermined amount is injected, water (water) may be applied to the outer circumference of the buried pipe. If there is a streak-like space called Michi), it may not be properly filled in the tail void on the outer circumference of the buried pipe through the water supply. And it is very difficult to confirm because the situation is outside the buried pipe.

Further, in propulsion work and caisson work, in order to reduce friction between the propulsion pipe or caisson and the ground, a lubricant, which is a grout material, is injected into the tail void. The same phenomenon as in the case of injection may occur, and it is difficult to confirm whether or not the lubricant is properly filled.

Also, in the shield construction of underground tunnel construction, backfill injection is performed in the tail void between the segment and the ground in order to prevent subsidence due to loosening of the ground in the overcut part during excavation. As in the case of propulsion work, it is difficult to confirm whether or not the backing material is filled in the tail void.

In this way, when grout materials such as backing material and lubricant are injected or placed in the ground, it is determined whether or not the various grout materials that have been applied are properly filled in the target location of the tail void. The current situation is that it is difficult to do.

Various proposals have been made so far for the above situation. For example, in Patent Document 1, an elastic check valve having a stretchable insertion hole in the center is provided on a plug having a guide hole in the center from the inside of the measurement hole provided through the pipe wall of the buried pipe. We are proposing a method of investigating the size and condition of the tail voids on the outer periphery of the buried pipe by inserting a probe rod or sampling pipe out of the pipe and performing sampling.

Further, in Patent Document 2 of another proposal, the inner cylinder is rotatably inserted into the outer cylinder into the through hole of the buried pipe, and the sleeve that can be twisted and squeezed by the flexible pipe from the tip of the outer cylinder to the tip of the inner cylinder is used. We have proposed a device that connects to form a valve body that opens and closes by rotating the inner cylinder, and inserts the detection rod from the inside of the buried pipe to the outside of the buried pipe.

In Patent Document 3 of another proposal, a ball valve capable of inserting a rod material in the valve open state is attached inside the injection hole of the buried pipe, and a research rod material is inserted inside the valve in the valve closed state. Connect a packing jig with a possible through hole and a packing material that can stop water around the outer circumference of the survey rod, insert the tip of the survey rod to the front of the valve in the valve closed state, and stop with the packing jig. The valve is opened with water, and the inside of the valve is penetrated and inserted into the ground side to check the amount of excess digging and soil quality.

Japanese Unexamined Patent Publication No. 11-31108 JP-A-2005-113388 JP-A-2009-138489

However, according to the proposal described in Patent Document 1, although the state of the outer peripheral portion of the tail void can be investigated, a grout material such as a backing material or a lubricant is used in a place where an elastic check valve is used. There was a problem that it could not be injected.

Further, in the proposal described in Patent Document 2, although it is possible to investigate the tail void portion, there is a concern that the apparatus becomes large-scale and the cost increases. Further, even in this proposal, there is a problem that grout materials such as backing material and lubricant cannot be injected in the place where the device is used.

Further, also in the proposal described in Patent Document 3, although the state of the outer peripheral portion of the tail void can be confirmed, there is a problem that a grout material such as a backing material or a lubricant cannot be injected at a place where the device is used.

The present invention has been made in view of the above circumstances, and is attached to a grout material injection hole provided through a pipe wall of a buried pipe in a propulsion method, a shield method, or the like to inject a grout material. At the same time, a rod-shaped member equipped with a sensor can be inserted from the buried pipe to the ground side to check the filling state of the grout material in the tail void, and the backflow of liquid material such as the grout material from the ground side. The challenge is to provide a check valve that can prevent this.

The check valve of the present invention has been made to solve the above technical problems, and is characterized by the following.

First, it is a check valve that is attached to the grout material injection hole provided by penetrating the pipe wall of the buried pipe from the inner wall surface side to the ground side, and is a check valve having a circular tubular frame portion and the frame portion. The check valve portion for the grout material for injecting the grout material provided on the inside and the elastic check valve portion for inserting and removing the rod-shaped member provided on the inside of the frame body portion are provided, and the elastic check valve portion is provided. The valve stop portion is provided with an elastic body and an insertion hole that penetrates the elastic body from the inner wall surface side to the ground side, and when the rod-shaped member is inserted or removed from the insertion hole, the elastic restoring force of the elastic body causes the elastic body. It is a check valve characterized by having a water blocking function to prevent backflow of liquid matter.

Secondly, in the check valve of the first invention, two check valve portions for the grout material are provided inside the frame body portion, and the elastic check valve portion is for two grout materials. It is preferable that it is provided between the check valve portions.

Third, in the check valve of the first invention, the check valve portion for the grout material is provided in the inner semicircular portion of the frame body portion, and the elastic check valve portion is provided in the other semicircular portion. Is preferably provided.

Fourth, in the check valve of the first invention, the check valve member for injection provided with the check valve portion for the grout material and the elastic check valve member provided with the elastic check valve portion. The check valve member for injection is mounted on the inner wall surface side of the buried pipe of the check valve member for injection in a state where the check valve member for injection is mounted on the grout material injection hole. When the rod-shaped member is inserted into the elastic check valve portion of the elastic check valve member, the tip portion of the rod-shaped member is the check valve portion for the grout material of the injection check valve member. It is preferable that it is provided at a position where it can pass through.

Fifth, in the check valve of the first to fourth inventions, it is preferable that the elastic body of the elastic check valve portion is laminated in a plurality of layers in the direction perpendicular to the insertion hole.

Sixth, in the check valve of the first to fifth inventions, the diameter of the elastic body of the elastic check valve portion is formed to be larger on the inner wall surface side of the pipe than on the ground side or larger on the ground side than the inner wall surface side of the pipe. It is preferable that it is.

Seventh, in the check valve of the first to sixth inventions, the elastic body of the elastic check valve portion has a retaining portion formed at at least one end on the inner wall surface side or the ground side of the pipe. It is preferable that it is.

Eighth, in the check valve of the first to seventh inventions, it is preferable that the elastic body of the elastic check valve portion is rubber or a thermoplastic elastomer.

Ninth, in the check valve of the first to eighth inventions, it is preferable that a lid member is detachably provided on the inner wall surface side of the elastic check valve portion.

According to the check valve of the present invention, in the propulsion method, the shield method, etc., the grout material can be injected by mounting the grout material in the grout material injection hole provided through the pipe wall of the buried pipe, and the sensor is provided. It is possible to check the filling state of the grout material into the tail void by inserting the rod-shaped member from the buried pipe to the ground side, and to prevent the backflow of liquid substances such as the grout material from the ground side. Become.

(A1) to (a3) are schematic views showing one embodiment of the check valve of the present invention. (B1) to (b3) are schematic explanatory sectional views showing a usage state of the check valve shown in FIG. (A1) is a single layer, and (a2) and (a3) are schematic cross-sectional views of an elastic check valve portion laminated in multiple layers. (A1) is a single-layer elastic check valve portion formed in a tapered shape and provided with a retaining portion, and (a2) and (a3) are formed in a tapered shape and provided with a retaining portion and laminated in multiple layers. It is the schematic sectional drawing of the elastic check valve part. (A1), (a2), (b1) to (b3) show schematic views of an embodiment in which a lid member is provided on the elastic check valve portion of the check valve shown in FIG. 1, and (c1) to (c3). ) Is a schematic view of the lid member. (A1) to (a3) are schematic explanatory cross-sectional views showing a usage state of the check valve shown in FIG. (A1) to (a4) are schematic views showing another embodiment of the check valve of the present invention, and (b) is a schematic cross-sectional view showing a state of use. It is a schematic diagram which shows the check valve of embodiment which provided the check valve part for grout material in the semicircular part inside the frame body part, and provided the elastic check valve part in the other semicircular part. In (a1) to (a3), the check valve of the embodiment is provided with an elastic check valve portion in a semicircular portion inside the frame body portion, and the other semicircular portion is a transparent member made of transparent resin or glass. It is a schematic diagram which shows, and (b1)-(b3) are schematic explanatory sectional views which show the use state. (A1) to (a3) are schematic views showing the check valve of the embodiment in which the part other than the circular elastic check valve portion inside the frame body portion is a transparent member made of transparent resin or glass. .. (A1) to (a4) are schematic views of an embodiment in which a lid member is provided on the elastic check valve portion of the check valve shown in FIG. (A1) to (a4) are schematic views showing another embodiment of the elastic check valve portion of FIG. 10, and (b1) and (b2) are schematic explanatory sectional views showing a state of use.

The check valve of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic view showing an embodiment of a check valve of the present invention, (a1) is a schematic cross-sectional view, (a2) is a schematic front view seen from the ground side, and (a3) is from the inner wall surface side of the pipe. It is a schematic rear view as seen. Further, (b1) to (b3) of FIG. 2 are schematic explanatory cross-sectional views showing each stage of the use state of the check valve shown in FIG.

The check valve 1 of the present invention is attached to the grout material injection hole 6 provided through the pipe wall 51 of the buried pipe 5. The check valve 1 includes a grout material check valve portion 2 for injecting the grout material 81, and an elastic check valve portion 3 into which a rod-shaped member 7 can be inserted and removed. The elastic check valve portion 3 is provided with an elastic body 31 and an insertion hole 32 penetrating the elastic body 31, and when the rod-shaped member 7 is inserted and removed from the insertion hole 32, the elastic body 31 is elastically restored. It has a water stopping function by force.

Examples of the buried pipe 5 to which the check valve 1 of the present embodiment can be applied include a propulsion pipe installed in propulsion work, a segment installed in shield work, and the like. Normally, the buried pipe 5 such as the propulsion pipe in the propulsion work and the segment in the shield work has a grout material injection hole 6 for injecting or placing the grout material 81 through the pipe wall 51 from the inner wall surface to the ground side. The check valve 1 of the present invention is provided and is used by being mounted on the grout material injection hole 6.

Further, the check valve 1 of the present invention has a function of inserting a rod-shaped member 7 from the inner wall surface side of the pipe toward the ground side, and at that time, preventing groundwater and the grout material 81 from flowing back into the pipe from the ground side. doing.

In the check valve 1 of the embodiment shown in FIG. 1, a base portion 12 is provided inside the circular tubular frame portion 11, and two check valve portions 2 for grout materials on the left and right sandwiching the base portion 12 are provided. It is provided. Further, an elastic check valve portion 3 is provided at the center of the base portion 12 so as to be sandwiched between the check valve portions 2 for grout materials on the left and right sides 2.

The circular tubular frame body portion 11 is formed in a size that can be mounted on the socket portion 61 of the grout material injection hole 6, and has a structure that does not easily come off in the mounted state. Specifically, for example, the female screw formed inside the socket portion 61 of the grout material injection hole 6 can be attached by screwing the male screw formed on the outside of the circular tubular frame portion 11. The height of the circular tubular frame portion 11, that is, the thickness of the check valve 1, is about the same as that of a general check valve mounted in the grout material injection hole 6, and is usually about 10 to 30 mm high. Is taken into account.

The check valve portion 2 for grout material provided inside the frame body portion 11 is formed in a so-called swing check valve shape, and is attached to the base portion 12 so that the disc portion 21 opens only on the ground side. .. That is, the check valve portion 2 for the grout material can inject the grout material 81 from the inner wall surface side of the pipe, and can prevent the backflow of the injected grout material 81.

Further, the elastic check valve portion 3 includes an elastic body 31 arranged from the inner wall surface side of the pipe to the ground side, and the elastic body 31 has an insertion hole 32 penetrating from the inner wall surface side of the pipe to the ground side. It is provided. The shape of the elastic body 31 is not particularly limited, and may be, for example, a rectangular parallelepiped or a columnar shape shown in FIG.

Further, as shown in FIGS. 3 (a2) and 3 (a3), the elastic body 31 can be provided by laminating a plurality of layers in the direction perpendicular to the insertion hole 32. The number of layers is not particularly limited, and for example, it may be two layers as shown in FIG. 3 (a2) or three layers as shown in FIG. 3 (a3). In addition, the thickness of each layer can be appropriately determined. By providing the elastic body 31 in a plurality of layers, when the rod-shaped member 7 is inserted and removed, each layer acts as a check valve, so that backflow can be reliably prevented.

The insertion hole 32 formed in the elastic body 31 is provided to insert the rod-shaped member 7 from the inner wall surface side of the pipe to the ground side. The insertion hole 32 is closed, and the check valve is such that the injected liquid material such as the grout material 81 does not flow back. The shape of the insertion hole 32 is not particularly limited as long as the liquid material does not flow back, and examples thereof include a point shape, a linear slit shape, and a cross slit shape.

The material of the elastic body 31 is not particularly limited as long as the liquid material can be prevented from flowing back when the rod-shaped member 7 is not inserted and when the rod-shaped member 7 is inserted, but usually an elastomer can be used, and in particular, rubber or thermoplastic. Elastomers can be preferably used.

As the rod-shaped member 7 to be inserted into the insertion hole 32 of the elastic check valve portion 3, a rod-shaped sensor member used for inspecting or investigating the injection state of the grout material 81 into the tail void 62 in propulsion work, shield work, etc. Specifically, for example, as shown in FIGS. 2 (b3) and 9 (b3), a rod-shaped or tubular shape composed of electrodes arranged so as to sandwich an insulator at regular intervals. A rod-shaped sensor 71 having a shape can be exemplified. These rod-shaped sensors 71 can measure conductivity, electrical resistance value, PH value, temperature, etc. according to the purpose, and are used by connecting to a measuring device capable of processing, displaying, and analyzing the measured values.

Further, the shape of the elastic body 31 can be formed so that the diameter on the inner wall surface side of the pipe is larger than that on the ground side, or the diameter on the ground side is larger than that on the inner wall surface side of the pipe. Specifically, a tapered shape in which the diameter gradually increases from the inner wall surface side of the pipe to the ground side as shown in FIGS. 4 (a1) and 4 (a2), or the side of the inner wall surface of the pipe from the ground side as shown in FIG. 4 (a3). It is possible to exemplify a tapered shape in which the diameter gradually increases. Further, in addition to the tapered shape, a step portion may be provided to increase the diameter, or a groove may be provided in the base portion in order to increase the adhesive force between the elastic body and the base portion.

By forming the diameter of the elastic body 31 larger on the inner wall surface side of the pipe than on the ground side, it is possible to prevent the elastic body 31 from falling off to the ground side when the rod-shaped member 7 is inserted, and it is possible to prevent the elastic body 31 from falling off on the inner wall surface side of the pipe. By forming the ground side larger than the ground side, it is possible to prevent the elastic body 31 from falling off to the inner wall surface side of the pipe when the rod-shaped member 7 is pulled out.

Further, it is preferable that the elastic body 31 is formed with a retaining portion 33 at at least one end on the inner wall surface side or the ground side of the pipe. Specifically, for example, as shown in FIGS. 4 (a1) to 4 (a3), a retaining portion 33 is formed on both the inner wall surface side and the ground side of the pipe. By forming the retaining portion 33 at at least one end on the inner wall surface side of the pipe or the ground side of the elastic body 31, it is possible to more reliably prevent the elastic body 31 from coming off.

Further, in the check valve 1 of the present embodiment, the lid member 4 can be detachably provided on the inner wall surface side of the elastic check valve portion 3. 5 (a1), (a2), (b1) to (b3) show an embodiment in which the lid member 4 is provided on the elastic check valve portion 3 of the check valve 1 shown in FIG. In the check valve 1 shown in FIG. 5, a lid mounting portion 34 is formed on the inner wall surface side of the elastic check valve portion 3, and the lid member 4 is formed in a cap shape that can be fitted to the lid mounting portion 34. There is.

The fit of the lid member 4 to the lid mounting portion 34 is not particularly limited as long as it can be prevented from being easily removed, but for example, as shown in FIG. 5 (a1), a screw thread 35 is formed on the outer periphery of the lid mounting portion 34. A thread 43 is formed on the inner side wall surface of the lid member 4 as shown in FIG. 5 (c1), and the lid member 4 is screwed into the lid mounting portion 34 to attach / detach the lid member 4. Can be ensured and facilitated. Further, by disposing the rubber-like packing 41 inside the lid member 4 as shown in FIGS. 5 (c1) and 5 (c3), the water stopping property can be improved. Further, by forming a non-slip knurl on the outer wall surface of the lid member 4 or providing a knob 42 on the outer surface as shown in FIGS. 5 (b3), (c1) and (c2), it is easy to fit the lid member 4. You can also do it.

By providing the lid member 4 on the inner wall surface side of the elastic check valve portion 3, the grout material 81 can be prevented from coming into contact with the elastic check valve portion 3 when the grout material 81 is injected, and the opening of the insertion hole 32. It is possible to prevent clogging and the like.

As a specific method of using the check valve 1 of the present embodiment, in the propulsion work for installing the propulsion pipe or the shield work for installing the segment, for example, as shown in FIG. 2 (b1), first, the grout material is used. A check valve 1 is attached to the grout material injection hole 6 of the predetermined buried pipe 5 or the socket portion 61 of the observation hole before the 81 is injected or placed, and as shown in FIG. 2 (b2), the grout material injection hole is provided. The grout injection pipe 8 is inserted into No. 6, and the grout material 81 is injected into the tail void 62 from the check valve portion 2 for the grout material of the check valve 1. At this time, the grout material 81 is injected into the tail void 62 by opening the disc portion 21 of the check valve portion 2 for the grout material toward the ground side. After the injection is completed, the disc portion 21 is closed by the pressure of the grout material 81 to prevent liquid substances such as groundwater and grout material 81 from flowing back into the pipe from the ground side.

Next, as shown in FIG. 2 (b3), the rod-shaped member 7 is inserted into the insertion hole 32 of the elastic check valve portion 3 of the check valve 1. Examples of the rod-shaped member 7 include a rod-shaped sensor 71 for measuring conductivity, resistance value, PH value, temperature, and the like with a measuring instrument. In the embodiment of FIG. 2 (b3), a state in which a rod-shaped sensor 71 for measuring conductivity is inserted is shown, and a conductivity meter connected to the rod-shaped sensor 71 is used to cover a lubricant or a backing material in the tail void 62. By measuring the values before and after the injection, it is possible to detect whether or not the grout material 81 is properly injected into the tail void 62. The rod-shaped member 7 can be smoothly inserted into the insertion hole 32 by applying a lubricant such as grease to the surface of the rod-shaped member 7 in advance.

Further, FIGS. 6 (a1) to 6 (a3) show a method of using the check valve 1 in which the lid member 4 is provided on the inner wall surface side of the elastic check valve portion 3.

In the method using the check valve 1 to which the lid member 4 can be attached and detached, as shown in FIG. 6 (a1), the buried pipe 5 is fitted with the lid member 4 on the inner wall surface side of the elastic check valve portion 3. The check valve 1 is attached to the socket portion 61 of the grout material injection hole 6 of the above. Next, as shown in FIG. 6A2, the grout injection pipe 8 is inserted into the grout material injection hole 6, and the grout material 81 is injected into the tail void 62 from the check valve portion 2 for the grout material of the check valve 1. To do. After the injection of the grout material 81 is completed, the lid member 4 of the elastic check valve portion 3 is removed as shown in FIG. 6 (a3), and the rod-shaped member 7 for inspecting the injection state of the grout material 81 is inserted into the insertion hole 32. insert. In the embodiment of FIG. 6A3, the sampling pipe 72 is inserted as the rod-shaped member 7.

Then, after the inspection is completed, the rod-shaped member 7 is removed, the lid member 4 is fitted, and the work is completed. As a result, inspection can be performed through the insertion hole 32 of the elastic body 31, and backflow of liquid matter such as groundwater and grout material 81 from the ground side can be prevented.

In the check valve 1 of the present invention, the shape of the elastic body 31 of the elastic check valve portion 3 and the number of insertion holes 32 can be appropriately determined according to the shape and function of the rod-shaped member 7 into which the check valve is inserted. For example, in the embodiment shown in FIG. 7, two elastic check valve portions 3 are provided between the two check valve portions 2 for grout materials. This makes it possible to use a sensor member having two sensor portions or to use two rod-shaped members 7 at the same time.

In the used state shown in FIG. 7B, two electrode portions 73 for measuring the electric resistance value are inserted as the rod-shaped member 7. By inserting the rod-shaped member 7 from two places in this way, the electric resistance value before and after the injection of the grout material 81 such as the lubricant and the backing material is measured using the two electrodes, and the change in the measured value. It is possible to detect whether or not the grout material has been injected. Further, two conductivity meters can be inserted as the other rod-shaped member 7, and the average value of the two measured values can be used as the measured value.

Further, in the check valve 1 of the present invention, as another embodiment, as shown in FIG. 8, a check valve portion 2 for grout material is provided in a semicircular portion inside the frame body portion 11, and the other semicircular portion is provided. It is also possible to provide an elastic check valve portion 3 on the surface.

Further, in the check valve 1 of the present invention, in addition to the check valve 1 having a structure in which a check valve portion 2 for a grout material and an elastic check valve portion 3 are provided in a circular tubular frame portion 11 and integrated. , A check valve member 20 for injection provided with a check valve portion 2 for grout materials and an elastic check valve provided with an elastic check valve portion 3 as shown in FIGS. 9 (b1) to 9 (b3). The check valve 1 may have a structure in which the member 30 is provided separately.

As shown in FIG. 9 (b1), the check valve 1 of this embodiment is first used as a grout material injection hole 6 or an observation hole in a predetermined buried pipe 5 before the grout material 81 is injected or placed. Only the check valve member 20 for injection is attached to the socket portion 61 of the above, and the grout material 81 is injected into the tail void 62 from the check valve portion 2 for the grout material of the check valve 1 through the grout injection pipe 8. At this time, the grout material 81 is injected into the tail void 62 by opening the disc portion 21 of the check valve portion 2 for the grout material toward the ground side. After the injection is completed, the disc portion 21 is closed by the pressure of the grout material 81 to prevent liquid substances such as groundwater and grout material 81 from flowing back into the pipe from the ground side.

Next, as shown in FIG. 9B2, with the injection check valve member 20 mounted on the ground side of the grout material injection hole 6, the inner wall surface side of the buried pipe 5 of the injection check valve member 20. The elastic check valve member 30 is attached to the. The elastic check valve member 30 is provided with an elastic check valve portion 3 in a semicircular portion of a circular tubular frame portion 11. Further, it is preferable that the portion other than the elastic check valve portion 3 is a transparent member 13 made of transparent resin or glass. In the embodiment of FIGS. 9 (a1) to 9 (a3), the elastic check valve portion 3 is provided in the semicircular portion of the circular tubular frame portion 11, and the other semicircular portion is formed of the transparent member 13. Further, in the embodiment shown in FIG. 10, a portion other than the elastic check valve portion 3 having a circular cross section provided in a part thereof is formed of the transparent member 13.

When mounting the injection check valve member 20, the insertion hole 32 of the elastic body 31 is mounted so as to be located below the disc portion 21 of the injection check valve member 20. Here, by making the portion of the elastic check valve member 30 other than the elastic check valve portion 3 a transparent member 13 as described above, the check valve member 20 for injection on the ground side can be seen through, so that the check valve member 20 for injection can be seen through. It is possible to easily align the insertion hole 32 of the elastic body 31 with respect to the disc portion 21 of the check valve member 20.

Then, in this state, as shown in FIG. 9 (b3), the rod-shaped member 7 (rod-shaped sensor 71) is inserted into the insertion hole 32 of the elastic check valve portion 3. The tip of the inserted rod-shaped member 7 pushes the disc portion 21 of the injection check valve member 20 from the inner wall surface side of the pipe, passes through the check valve portion 2 for grout material, and reaches the tail void 62. Then, by measuring the values before and after the injection of the lubricant and the backing material in the tail void 62 with the conductivity meter connected to the rod-shaped sensor 71, it is determined whether or not the grout material 81 is properly injected into the tail void 62. Can be inspected. In the check valve 1 of the present embodiment, an existing general check valve can also be used as the injection check valve member 20. Further, also in the present embodiment, as shown in FIG. 11, a lid member 4 is provided on the inner wall surface side of the elastic check valve portion 3, and as shown in FIG. 12, the elastic body 31 of the elastic check valve portion 3 is provided. The shape and the number of insertion holes 32 can be appropriately determined.

1 Check valve 11 Frame body 2 Check valve for grout material 20 Check valve member for injection 3 Elastic check valve member 30 Elastic check valve member 31 Elastic body 32 Insertion hole 33 Retaining part 4 Lid member 5 Buried Tube 51 Tube wall 6 Grout material injection hole 7 Rod-shaped member 81 Grout material

Claims (8)

A check valve that is attached to the grout material injection hole provided by penetrating the pipe wall of the buried pipe from the inner wall surface side to the ground side.
With a circular tubular frame
Two check valve portions for grout material for injecting grout material provided inside the frame body portion, and
Inside the frame body portion, an elastic check valve portion for inserting and removing a rod-shaped member provided between the two check valve portions for grout material is provided.
The elastic check valve portion is provided with an elastic body and an insertion hole through which the elastic body penetrates from the inner wall surface side of the pipe to the ground side.
A check valve having a water-stop function that prevents backflow of a liquid substance due to the elastic restoring force of the elastic body when the rod-shaped member is inserted into and removed from the insertion hole. A check valve that is attached to the grout material injection hole provided by penetrating the pipe wall of the buried pipe from the inner wall surface side to the ground side.
With a circular tubular frame
A check valve portion for the grout material for injecting the grout material provided in the semicircular portion inside the frame body portion, and a check valve portion for the grout material.
An elastic check valve portion for inserting and removing a rod-shaped member provided in another semicircular portion inside the frame body portion is provided.
The elastic check valve portion is provided with an elastic body and an insertion hole through which the elastic body penetrates from the inner wall surface side of the pipe to the ground side.
A check valve having a water-stop function that prevents backflow of a liquid substance due to the elastic restoring force of the elastic body when the rod-shaped member is inserted into and removed from the insertion hole. A check valve that is attached to the grout material injection hole provided by penetrating the pipe wall of the buried pipe from the inner wall surface side to the ground side.
With a circular tubular frame
An injection check valve member having a grout material check valve portion for injecting the grout material, which is provided inside the frame body portion.
An elastic check valve member having an elastic check valve portion to which a rod-shaped member can be inserted and removed, which is provided inside the frame body portion, is provided separately.
The elastic check valve portion is provided with an elastic body and an insertion hole through which the elastic body penetrates from the inner wall surface side of the pipe to the ground side.
When the rod-shaped member is inserted into or removed from the insertion hole, it has a water-stopping function to prevent backflow of liquid matter due to the elastic restoring force of the elastic body.
With the injection check valve member mounted in the grout material injection hole, the elastic check valve member can be mounted on the inner wall surface side of the buried pipe of the injection check valve member.
When the rod-shaped member is inserted into the elastic check valve portion of the elastic check valve member, the tip portion of the rod-shaped member can pass through the check valve portion for grout material of the injection check valve member. A check valve characterized by being installed at various positions. The check valve according to any one of claims 1 to 3, wherein the elastic body of the elastic check valve portion is laminated in a plurality of layers in a direction perpendicular to the insertion hole. The invention according to any one of claims 1 to 4, wherein the diameter of the elastic body of the elastic check valve portion is formed to be larger on the inner wall surface side of the pipe than on the ground side or on the ground side than on the inner wall surface side of the pipe. Check valve. The invention according to any one of claims 1 to 5, wherein the elastic body of the elastic check valve portion is formed with a retaining portion at at least one end on the inner wall surface side or the ground side of the pipe. Check valve. The check valve according to any one of claims 1 to 6, wherein the elastic body of the elastic check valve portion is a rubber or a thermoplastic elastomer. The check valve according to any one of claims 1 to 7 , wherein a lid member is detachably provided on the inner wall surface side of the elastic check valve portion.

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