JP2011132992A - Water stop packer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light weight water stop packer easy to handle, and further coping with pipes of different diameters. <P>SOLUTION: This water stop packer 1 for cutting off water of a sewer conduit P comprises a different-diametric cylindrical woven fabric having a large-diametric part 2a and two small-diametric parts 2b, and has an expansion body 2 expandable radial-directionally when air is injected into the cylindrical woven fabric, and an outer cylinder 3 coated onto the expansion body 2, and having an inside diameter smaller than the maximum outside diameter of the expansion body 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water stop packer used when water is stopped in a pipe, and a water stop method for a pipe using the water stop packer.

  When filling a pipe used as a drain pipe or sewer pipe with water to test for leaks or repairing a deteriorated existing pipe, it is necessary to stop a part of the pipe. . As such a water-stopping method for piping, there is known a method of closing a piping by inserting a packer (blocking tool) in the piping.

  Patent Documents 1 and 2 disclose a water-stopping packer having a hollow structure formed of a flexible material such as rubber or rubber-woven fabric. When water is stopped in the pipe, after the packer is installed at a predetermined position in the pipe, the packer is expanded (expanded diameter) by injecting air into the pipe, and the packer Adhere to the inner surface.

  Patent Document 3 includes a cylindrical metal plug main body, an outer seal made of a bag provided on the outer peripheral surface of the plug main body, and a bag provided on the inner peripheral surface of the plug main body. A water stop packer (water stop plug) having an inner seal is disclosed. In this waterproof packer, the outer seal expands by injecting air into the inside thereof to close the gap between the outer peripheral surface of the plug body and the inner surface of the pipe, while the inner seal expands by injecting air into the inside. The inside of the pipe is closed by closing the inner space of the cylindrical plug body.

Japanese Utility Model Publication No. 7-38891 Japanese Patent Laid-Open No. 5-148885 JP 2001-82673 A

  By the way, although the portion that is in close contact with the inner surface of the pipe line by the internal pressure applied to the packer is held by the pipe line, there is nothing to hold the end part of the packer. The packer itself needs strength. Therefore, in the conventional water-stopping packer formed of a flexible material such as rubber as described in Patent Documents 1 and 2, the thickness of the packer must be increased.

  In particular, when water is shut off from a large-diameter pipe, a packer with a larger diameter will be used, but the larger the packer diameter, the greater the wall thickness needs to be increased. There is. However, when the thickness of the rubber water-stopping packer is increased, the weight is considerably increased. Such a heavy packer requires a large amount of equipment for handling and makes installation work difficult. For example, when installing a water-stopping packer with a weight of several hundred kilograms in an underground pipe, it is necessary to lower the packer with a tow from a manhole and pull the packer with a winch from another manhole. . In this case, a large-sized equipment such as a tow truck or a winch is required, and an area occupied on the ground at the time of work increases, which impedes the passage of ordinary vehicles and pedestrians.

  Further, the water-stopping packer described in Patent Document 3 has a cylindrical main body portion (plug main body) that is a metal rigid body and has high strength, and inflates a bag body provided on the outer periphery of the main body portion. However, one type of packer cannot be used for pipes with different diameters, and a packer of a size corresponding to the diameter of the pipe to be water-stopped is prepared each time. There is a need.

  An object of the present invention is to provide a water-stopping packer that is light and easy to handle, and that can handle pipes having different diameters.

Means for Solving the Problems and Effects of the Invention

  The water-stop packer according to the first aspect of the present invention is a water-stop packer that is installed in a pipe and stops the pipe. The water-stop packer is made of a tubular fabric and has a diameter when a fluid is injected into the tubular fabric. It is characterized by having an inflatable body that can expand in the direction and an elastic body that is covered with the expandable body and that has an inner cylinder whose inner diameter is smaller than the maximum outer diameter of the expandable body.

  In the water-stopping packer of the present invention, when a fluid is injected into the expansion body made of a cylindrical fabric, the expansion body expands in the radial direction by the pressure of the fluid. Here, since the inner diameter of the outer cylinder covered with the expansion body is smaller than the maximum outer diameter of the expansion body, the outer cylinder made of an elastic body is pushed and expanded in the radial direction as the expansion body expands. The outer cylinder is pressed against the inner surface of the pipe over the entire circumference. Thereby, the water stop in piping is attained.

  Here, the expanded body made of a tubular woven fabric is light and its tensile strength is considerably higher than that of a tubular body made of a flexible material such as rubber. Therefore, the expansion body can bear the pressure resistance strength, and the outer cylinder is not required to have such a large strength. Therefore, the outer cylinder can be made thin and lightweight. Therefore, the weight of the whole packer is reduced, and handling at the time of transportation to the site and installation of the packer in the piping becomes easy. In addition, by inflating the expansion body by injecting fluid, the outer cylinder is expanded and brought into close contact with the inner surface of the pipe. It becomes possible. Furthermore, because of the two-layer structure of the outer cylinder that is in close contact with the inner surface of the pipe and the expansion body inside the pipe, when the surface of the outer cylinder that is in close contact with the inner surface of the pipe is damaged, only this outer cylinder is replaced, The expanded body can be used continuously. In addition, when the water-stop packer is composed only of the expansion body, the expansion body has wrinkles as shown in FIG. 4 (b) of the embodiment, and water leaks from this wrinkle portion. In the invention, water leakage can be prevented by providing the outer cylinder on the outer side of the inflatable body.

  The water-stop packer according to a second aspect of the present invention is the seam packer according to the first aspect, wherein the expansion body is composed of a plurality of warps and a weft continuously woven in a spiral shape with respect to the plurality of warps. It is characterized by being made of no cylindrical fabric.

  Thus, if the tubular woven fabric constituting the expanded body is a seamless tubular woven fabric in which wefts are continuously woven in a spiral shape with respect to a plurality of warps, the tensile strength of the expanded body is further increased. The pressure resistance is improved.

  The water-stop packer according to a third aspect of the present invention is the first or second aspect of the present invention, wherein the expansion body is provided at a large-diameter portion and at both ends of the large-diameter portion in the cylinder axis direction, than the large-diameter portion It consists of a different diameter cylindrical fabric which has two small diameter parts with a small diameter.

  According to this configuration, the expansion body can be easily sealed at the two small diameter portions provided at both ends. Furthermore, since the force acts uniformly on the warp at the end of the expanded body that requires pressure resistance, it can be suitably used for water stoppage in a large-diameter pipe.

  The water-stop packer according to a fourth aspect is characterized in that, in the third aspect, the inner diameter of the outer cylinder is substantially equal to the outer diameter of the small-diameter portion of the expansion body.

  According to this configuration, the diameter of the outer cylinder can be increased in the range from the small diameter portion to the large diameter portion of the expansion body, so that one type of outer cylinder can cope with a wide range of pipe diameters.

  A water-stopping packer according to a fifth invention is characterized in that, in any one of the first to fourth inventions, the outer cylinder is made of a rubber material.

  In this way, when the outer cylinder is formed of a rubber material rich in elasticity, when the expanding body arranged on the inner side expands in the radial direction, the outer cylinder easily expands following the expansion. It can be firmly attached to the inner surface of the pipe. Therefore, even if the diameters of the pipes are slightly different, the difference in diameter can be absorbed by the expansion amount of the outer cylinder, so that one type of outer cylinder can cope with a wide range of pipe diameters. .

  A water-stopping packer according to a sixth invention is characterized in that, in any one of the first to fifth inventions, the expansion body is made of a high-strength polyethylene fiber.

  By forming the expanded body with high-strength polyethylene fibers, the strength of the expanded body is further increased. In addition, since the high strength polyethylene fiber has good slipperiness, when the expansion body expands, the outer surface of the expansion body and the inner surface of the outer cylinder are not easily caught, the outer cylinder is smooth, and the diameter is increased evenly in the circumferential direction. To do. Further, since the friction generated between the expansion body and the outer cylinder is small, wear is suppressed.

  In the water-stopping packer of the seventh invention, in any one of the first to sixth inventions, a plurality of annular protrusions are provided on the outer peripheral surface of the outer cylinder at intervals in the cylinder axis direction. It is a feature.

  According to this configuration, since the outer peripheral surface of the outer cylinder is in line contact with the inner surface of the pipe at the tip of the annular protrusion, a large force acts locally on the tip of the annular protrusion, so that the annular protrusion is reliably attached to the inner surface of the pipe. In close contact. Therefore, the sealing performance between the inner surface of the pipe and the outer cylinder is improved.

  The water-stopping packer according to an eighth aspect of the present invention is the valve member according to any one of the first to seventh aspects, wherein the tubular member inserted into the inflatable body and having a shape retaining property and the internal passage of the tubular member can be opened and closed. And both ends of the expansion body and the outer cylinder in the cylinder axial direction are fixed to the pipe member.

  When there is no need for water stoppage, the fluid in the expansion body is discharged and the expansion body is contracted, so that the water that has been blocked on one side of the water stop packer may be discharged to the other side. In this case, since the dammed water flows at once, it is necessary to take care such as slowly contracting the expansion body. On the other hand, in the present invention, the pipe member inserted into the expansion body discharges the water blocked on one side in the cylinder axis direction (pipe longitudinal direction) of the water stop packer to the other side in the cylinder axis direction. Function as. Therefore, by opening the internal passage of the pipe member by the valve, the water that has been blocked can be gradually discharged from the pipe member. In addition, since the pipe member has a shape retaining property, the pipe member is not crushed by the pressure of the fluid injected into the expanded body, and the internal flow path is not blocked, and the fluid is injected into the expanded body. The water that has been blocked can be discharged from the pipe member.

  The water-stopping packer according to a ninth aspect of the invention is characterized in that, in the eighth aspect of the invention, it has a pipe joint for connecting the ends of the two pipe members.

  In order to reliably stop the water inside the pipe, it is necessary to close a certain length or more with the water stop packer, but if the total length of the water stop packer is long, it becomes difficult to carry it into the pipe, etc. Installation work of the still water packer becomes difficult. However, in the present invention, since the pipe members of two water-stopping packers can be used by connecting them with pipe joints, a plurality of water-stopping packers are connected in series while shortening the overall length of one water-stopping packer. A predetermined blockage length can be secured by connecting and using.

  The water-stop packer according to a tenth aspect of the invention is characterized in that, in the eighth or ninth aspect, at least a part of the pipe member has flexibility in the length direction.

  According to this configuration, the water-stopping packer can be inserted into the pipe while the pipe member is bent, so that the water-stopping packer can be easily installed even in a small work space.

  Here, the tubular member may be a tubular woven fabric whose inner and outer surfaces are coated with a resin (11th invention).

  The water-stop packer according to a twelfth aspect of the present invention is characterized in that, in any of the first to eleventh aspects, a length of the outer cylinder in the cylinder axis direction is longer than that of the expansion body.

  According to this configuration, since the expansion body is completely covered by the outer cylinder, it is possible to reliably prevent water from entering between the expansion body and the outer cylinder by sealing the end of the outer cylinder.

  According to a thirteenth aspect of the present invention, there is provided a water stoppage method for a pipe, the step of installing the waterstop packer according to the first aspect of the present invention in the pipe, and injecting a fluid into the expansion body to expand the expansion body in the radial direction. And an expansion step for bringing the outer cylinder into close contact with the inner surface of the pipe.

  According to the present invention, the lightweight inflatable body made of the tubular woven fabric bears pressure resistance, so that the outer cylinder is not required to have such a great strength, so the outer cylinder is made thin and lightweight. be able to. Therefore, the weight of the entire packer is reduced, and handling at the time of transportation to the site and installation of the packer in the piping becomes easy. In addition, by inflating the expansion body by injecting a fluid, the outer cylinder is expanded in diameter and brought into close contact with the inner surface of the pipe. It becomes possible. Furthermore, when the surface of the outer cylinder that is in close contact with the inner surface of the pipe is damaged, only the outer cylinder can be replaced and the expanded body can continue to be used.

According to a fourteenth aspect of the present invention, in the thirteenth aspect of the invention, the water stop packer includes a pipe member inserted into the expansion body, and a valve capable of opening and closing an internal passage of the pipe member. And both ends of the expansion body and the outer cylinder in the cylinder axis direction are fixed to the pipe member,
After the expansion step, a drainage step is provided in which an internal passage of the pipe member is opened by the valve, and water in the pipe that has been stopped is discharged from the internal passage. is there.

  In the present invention, the pipe member inserted into the expansion body functions as a discharge pipe that discharges the water blocked on one side in the cylinder axis direction of the water stop packer to the other side in the cylinder axis direction. In other words, when it is no longer necessary to stop the piping, the water that has been blocked can be gradually discharged from the pipe member simply by opening the internal passage of the pipe member with the valve. In addition, even during the work, the blocked water can be discharged as necessary.

It is sectional drawing in the plane containing a pipe axis of the sewer pipe concerning this embodiment. It is sectional drawing of a water stop packer. It is an enlarged view which shows another form of the edge part of a water stop packer. It is sectional drawing in the plane orthogonal to a pipe axis of the sewer pipe in which the water stop packer of the expansion | swelling state was installed, (a) shows the sewer pipe of a large diameter, and (b) shows the sewer pipe of a small diameter, respectively. It is the schematic of the expansion body of an Example. It is the schematic of the outer cylinder of an Example. It is sectional drawing of the water stop packer of the modification 1. It is sectional drawing of the water stop packer of the modification 2. It is sectional drawing in the plane containing a pipe axis of the sewer pipe concerning the modification 2. It is sectional drawing of the water stop packer of the modification 3. It is sectional drawing of the air injection part shown by FIG. It is sectional drawing of the water stop packer of the modification 4.

  Next, an embodiment of the present invention will be described. This embodiment is an example using the water-stop packer of the present invention when water-stopping a sewer pipe. FIG. 1 is a cross-sectional view of a sewer pipe in a stopped state in a plane including a pipe axis.

  As shown in FIG. 1, the sewer pipe P is buried in the ground, and a plurality of manholes H are connected to the sewer pipe P. In such a sewer pipe P, when stopping the sewer pipe P, such as when repairing the sewer pipe P, etc., the water stop packer 1 is carried into the sewer pipe P from the manhole H. The sewer pipe P is closed by installing and inflating by injecting air into the water-stop packer 1.

  Next, the water stop packer 1 that stops the sewer pipe P will be described in detail. FIG. 2 is a cross-sectional view of the water-stop packer 1. As shown in FIG. 2, the water-stop packer 1 is made of a tubular woven fabric having airtightness, and expands in a radial direction when air is injected therein, and is covered with the expandable body 2. And an outer cylinder 3.

  The expansion body 2 is made of a cylindrical woven fabric woven with high-strength polyethylene fibers (for example, Dyneema (manufactured by Toyobo Co., Ltd.)). The tubular fabric includes a large-diameter portion 2a located at a central portion in the cylinder axis direction, and two small-diameter portions provided at both ends of the large-diameter portion 2a in the cylinder axis direction and having a smaller diameter than the large-diameter portion 2a. 2b, a different diameter cylindrical woven fabric. The large diameter portion 2a and the small diameter portion 2b are connected by a tapered connection portion 2c. Further, when the tubular woven fabric constituting the expanded body 2 is a seamless tubular woven fabric composed of a plurality of warps and wefts woven continuously in a spiral shape with respect to the plurality of warps, the expanded body 2 has a high tensile strength, and the pressure resistance is improved. Moreover, since the expansion body 2 is a different-diameter cylindrical woven fabric having a large-diameter portion 2a and a small-diameter portion 2b, a force acts uniformly on the warp at the end, and the pressure resistance is further improved. It can be suitably used for a pipe having a diameter.

  Furthermore, the inner surface of this different-diameter cylindrical fabric is coated with a resin, and as a result, the expansion body 2 has airtightness. The expanded body 2 is in a deflated state due to the contraction force of the outer cylinder when no pressurized air is injected therein, but air is injected into the inside from one small diameter portion 2b (right side in FIG. 2). When done, it expands in the radial direction. In addition, tubular fabrics woven with high-strength polyethylene fibers have a higher tensile strength than ordinary polyester fiber tubular fabrics, so the amount of yarn can be reduced and the weight can be reduced accordingly. Become.

  Examples of the method of coating the inner surface of the cylindrical fabric with resin include a method of applying a liquid resin to the inner surface of the cylindrical fabric and a method of using a resin tube. In addition, when covering the inner surface of the tubular fabric with a resin tube, the resin tube is drawn into the tubular fabric, or the inner and outer surfaces of the tubular fabric are reversed after the resin tube is put on the surface of the tubular fabric. A known technique such as a method for causing the above to be used can be employed. Furthermore, the resin tube may be bonded to the cylindrical fabric, or may be merely inserted into the cylindrical fabric without being bonded. In the case of bonding, it is not necessary to bond the resin tube to the tubular woven fabric over the entire outer surface, and the resin tube may be spot-bonded only in part. In this case, it is possible to prevent the resin tube from shifting with respect to the tubular fabric, and the expanded body 2 is flexible because the adhesive area is smaller than when the entire surface is bonded, and the expanded body 2 is easily folded. be able to.

  The outer cylinder 3 is a stretchable tube formed of a rubber material which is a kind of elastic body, such as natural rubber, synthetic rubber such as chloroprene rubber and SBR. In addition, closed-cell foamed rubber may be used. In this case, the outer cylinder 3 becomes softer and has excellent adhesion to the inner surface of the sewer pipe P. As shown in FIG. 2, the outer cylinder 3 includes a large-diameter portion 3 a and two small-diameter portions that are respectively covered by the large-diameter portion 2 a and the two small-diameter portions 2 b of the different-diameter tubular fabric that constitutes the expansion body 2. 3b. The outer cylinder 3 is only put on the expansion body 2 and is not fixedly bonded to the expansion body 2, and can be attached to and detached from the expansion body 2.

  Furthermore, the inner diameter of the large diameter portion 3a of the outer cylinder 3 is smaller than the maximum outer diameter of the large diameter portion 2a of the expansion body 2 (the outer diameter when the expansion body 2 is fully expanded). Therefore, when air is injected into the expansion body 2 and the expansion body 2 expands in the radial direction, the internal pressure (expansion force of the expansion body 2) acts on the outer cylinder 3 to push the outer cylinder 3 outward in the radial direction. Thus, the diameter is increased and the inner surface of the sewer pipe P is brought into close contact. In addition, the maximum outer diameter of the expansion body 2 is larger than the inner diameter of the sewer pipe P. Further, if the inner diameter of the large diameter portion 3 a of the outer cylinder 3 and the outer diameter of the small diameter portion 2 b of the expansion body 2 are made substantially equal, the large diameter portion 3 a of the outer cylinder 3 is changed to the small diameter portion 2 b of the expansion body 2. Since the diameter can be increased in the range of the large diameter portion 2a, one type of outer cylinder 3 can cope with a wide range of pipe diameters. In the drawing, the outer cylinder 3 having a different diameter having a large diameter portion 3a and a small diameter portion 3b is shown. However, the diameter of the outer cylinder 3 is constant at a diameter equal to that of the small diameter portion 3b in the drawing. A straight outer cylinder may be used.

  A sealing metal fitting 4 for sealing the small diameter portion 2b is inserted into one small diameter portion 2b of the expansion body 2, and the small diameter portion 2b of the expansion body 2 and the small diameter of the outer cylinder 3 covering the small diameter portion 2b. The portion 3 b is fastened with a band 6 and fixed to the sealing metal fitting 4. A cylindrical connecting fitting 5 is inserted into the other small-diameter portion 2b, and the small-diameter portion 2b of the expansion body 2 and the small-diameter portion 3b of the outer cylinder 3 placed thereon are fastened by a band 6 and connected. It is fixed to the metal fitting 5. Thus, when the expansion body 2 is a different-diameter cylindrical woven fabric having two small-diameter portions 2b located on both sides of the large-diameter portion 2a, the end of the expansion body 2 can be easily sealed.

  As shown in FIG. 2, if the end surface of the small diameter portion 2 b of the expansion body 2 is exposed, water may enter between the expansion body 2 and the outer cylinder 3 from this end surface. It is preferable to prevent intrusion of water from the small diameter portion 2b by applying a resin to 2b or impregnating the resin with the resin. Alternatively, as shown in FIG. 3, the length of the outer cylinder 3 in the cylinder axis direction is longer than that of the inflatable body 2, and the small diameter portion 2 b of the inflatable body 2 is completely covered by the rubber outer cylinder 3. Above, the edge part of the outer cylinder 3 may be directly fixed to the metal fittings 4 and 5 by the band 6. In this case, since the small diameter portion 2b of the expansion body 2 is not exposed, there is no problem of water intrusion.

  As shown in FIG. 1, a tube 7 is connected to the connection fitting 5, and this tube 7 is further connected to an air pump 8. Accordingly, pressurized air supplied from the air pump 8 is injected into the inflatable body 2 whose one end is sealed by the sealing metal fitting 4 via the tube 7 and the connection metal fitting 5.

  Next, the water stop method of the sewer pipe P using the water stop packer 1 mentioned above is demonstrated. As shown in FIG. 1, first, the still water packer 1 is carried from the manhole H and installed in the sewer pipe P. In this state, air is not injected into the expansion body 2 of the water blocking packer 1, the expansion body 2 is in a deflated state, and the outer cylinder 3 is not expanded. Moreover, as the water stop packer 1, the outer diameter of the outer cylinder 3 in a state where the diameter is not expanded is smaller than the inner diameter of the sewer pipe P which is a water stop target.

  Next, after connecting the tube 7 connected to the expansion body 2 to the air pump 8, air is injected from the air pump 8 into the expansion body 2 through the tube 7 at a predetermined pressure (for example, about 0.2 MPa) to expand the tube. The body 2 is expanded in the radial direction. Here, since the inner diameter of the large diameter part 3a of the outer cylinder 3 is smaller than the maximum outer diameter of the large diameter part 2a of the expansion body 2, the expansion force of the expansion body 2 acts on the outer cylinder 3 from the inside, The outer cylinder 3 is expanded in diameter and is in close contact with the inner surface of the sewer pipe P over the entire circumference.

  Here, the expansion body 2 made of a cylindrical fabric woven with high-strength polyethylene fibers is light, and its tensile strength is considerably higher than that of a cylinder made of a flexible material such as rubber. Accordingly, the expansion body 2 can bear the strength of the end surface portion against the air injection pressure (pressure resistance strength), and the outer cylinder 3 is not required to have a great strength. It can be. Thereby, the weight of the whole packer becomes small, and the handling at the time of the installation to the sewer pipe P of the water stoppage packer 1 and the water stop packer 1 becomes easy.

  Moreover, since the water-stop packer 1 has a two-layer structure of the outer cylinder 3 that is in close contact with the inner surface of the sewer pipe P and the expansion body 2 inside thereof, the surface of the outer cylinder 3 that is in close contact with the inner surface of the sewer pipe P is When it is damaged, only the outer cylinder 3 is replaced, and the expansion body 2 can be used continuously.

  Further, by inflating the expansion body 2 by injecting air, the diameter of the outer cylinder 3 is expanded and brought into close contact with the inner surface of the sewer pipe P. Therefore, one kind of water-stop packer 1 is connected to the sewer pipe P having a different diameter. Can be used. FIG. 4 is a cross-sectional view of the sewer pipe P on which the expanded water-stopping packer 1 is installed on a plane perpendicular to the pipe axis. As shown in FIG. 4A, when used for a sewer pipe P1 having a large diameter, the expansion body 2 is completely expanded to the maximum outer diameter, and the outer cylinder 3 is pressed against the inner surface of the sewer pipe P. . On the other hand, as shown in FIG. 4 (b), when used for a sewer pipe P2 having a smaller diameter than that of (a), the outer cylinder 3 is connected to the sewer pipe before the expansion body 2 expands to the maximum outer diameter. Pressed against the inner surface of P. That is, a part of the heel 2e remains in the expansion body 2.

  Here, when the outer cylinder 3 is formed of a rubber material rich in elasticity as in the present embodiment, the expansion body 2 disposed on the inner side follows the expansion in the radial direction. Thus, the outer cylinder 3 easily expands in diameter, and securely adheres to the inner surface of the sewer pipe P. Therefore, since the difference in diameter can be absorbed by the diameter expansion amount of the outer cylinder 3 with respect to the sewer pipes P having different diameters, it is possible to cope with a wide diameter range with one type of outer cylinder 3. it can.

  Furthermore, when the expansion body 2 is a cylindrical woven fabric woven with high-strength polyethylene fibers, not only the strength of the expansion body 2 is increased, but also the slipperiness of the surface of the expansion body 2 is improved. Therefore, when the expansion body 2 expands, the outer surface of the expansion body 2 is not easily caught with the inner surface of the outer cylinder 3, and the effect that the outer cylinder 3 expands smoothly and uniformly in the circumferential direction is obtained. Further, since the friction generated between the expansion body 2 and the outer cylinder 3 is small, wear is suppressed.

  Thereafter, when the work such as the repair of the sewer pipe P is completed and there is no need for water stop, when the tube 7 is opened, the expansion body 2 contracts due to the diameter reducing force of the outer cylinder 3 and the air is discharged. Since the cylinder 3 is reduced in diameter and separated from the inner surface of the sewer pipe P, the water blocked by the water stop packer 1 flows out.

  Next, specific examples of the water stop packer 1 will be described. The water-stop packer 1 of the following example can respond to the sewer pipe P having an inner diameter in the range of 200 to 400 mm. FIG. 5 is a diagram schematically showing the expansion body 2 of this embodiment, and FIG. 6 is a diagram schematically showing the outer cylinder 3. In addition, the unit of the dimension of FIG. 5, FIG. 6 is mm.

(Expandable body specification)
As shown in FIG. 5, the maximum diameter (420 mm) of the large diameter portion 2 a of the expansion body 2 is slightly larger than the maximum diameter (400 mm) of the sewer pipe P. And the diameter of the small diameter part 2b was 76 mm. Moreover, the specification of the warp and the weft of the different diameter cylindrical fabric which comprises an expansion body is as follows.
Warp: Dyneema 1320T / 4 Large diameter part density 5.3 / cm, Small diameter part density 29.5 / cm
Weft: Dyneema 1320T / 5 Density 7.0 / cm

(External cylinder specification)
The outer cylinder 3 is an elastic tube made of SBR rubber and has a thickness of 6 mm. Moreover, as shown in FIG. 6, the diameter (180 mm) of the large diameter portion 3 a of the outer cylinder 3 in a state where no internal pressure is applied is smaller than the maximum diameter (420 mm) of the large diameter portion 2 a of the expansion body 2. ing. And the outer cylinder 3 expand | extends to radial direction according to expansion | swelling of the expansion body 2, and can closely_contact | adhere to the sewer pipe P in the range whose internal diameter is 200-400 mm.

  Next, modified embodiments in which various modifications are made to the embodiment will be described. However, components having the same configuration as in the above embodiment are given the same reference numerals and description thereof is omitted as appropriate.

(Modification 1)
As shown in FIG. 7, a plurality of annular protrusions 3 e are provided on the outer peripheral surface of the outer cylinder 3 at intervals in the length direction of the outer cylinder 3 (the cylinder axis direction and the pipe axis direction of the sewer pipe P). Also good. In this case, since the outer peripheral surface of the outer cylinder 3 is in line contact with the inner surface of the sewer pipe P at the tip of the annular projection 3e, a large force acts locally on the tip of the annular projection 3e. 3e adheres firmly to the inner surface of the sewer pipe P. Therefore, compared with the case where the outer peripheral surface of the outer cylinder 3 is in surface contact with the inner surface of the sewer pipe P, the sealing performance between the inner surface of the sewer pipe P and the outer cylinder 3 is improved.

(Modification 2)
In the above-described embodiment (see FIG. 1), when there is no need for water stoppage, the fluid in the expansion body 2 is discharged, and the expansion body 2 is contracted to be dammed to one side of the water stop packer 1. Water is discharged to the other side. However, in this case, since the dammed water flows out at a time, it is necessary to contract the expansion body 2 slowly.

  Therefore, it is preferable that the water-stop packer 1 includes a discharge pipe that can discharge water without squeezing the expansion body 2. As shown in FIG. 8, the water-stop packer 1 according to the modified embodiment 2 includes a tubular member 13 having a shape retaining property that is inserted through the expansion body 2, and a valve 14 that can open and close the internal passage 13 a of the tubular member 13. ing.

  The pipe member 13 only needs to have a shape retaining property that does not collapse even when the pressure of the air in the expansion body 2 (for example, about 0.2 MPa) is applied, such as a metal material or a hard synthetic resin material. Can be used. Further, all or at least a part of the tube member 13 may have flexibility in the length direction. Examples of the flexible tube member 13 include a tubular woven fabric that is woven with polyester fibers and has shape retention, and its inner and outer surfaces are covered with a resin so as to be airtight. Can do. In addition, a flexible pipe made of stainless steel can be used. When all or part of the pipe member 13 has flexibility in the length direction, the water-stopping packer 1 can be inserted into the sewer pipe P while bending the pipe member 13 from the manhole H. Installation of the water packer 1 is easy.

An example of the flexible tube member 13 is shown below.
Diameter: 60mm
Warp: Polyester fiber with a thickness of 8350T (1670T, 5 strands), density 8 / cm
Weft: SUS wire with a thickness of 1.8mm, density 3 / cm
The inner and outer surfaces of the tubular woven fabric obtained by weaving the warp and weft in an annular shape were covered with a urethane resin to obtain an airtight flexible hose.

  The valve 14 is, for example, a ball valve, and is provided at one end of the pipe member 13 so that the internal passage 13a of the pipe member 13 can be opened and closed. Further, both end portions of the expansion body 2 and the outer cylinder 3 are respectively fixed to the pipe member 13 by the band 6. In addition, since the pipe member 13 is inserted through the expansion body 2 and the end opposite to the valve 14 is open, the water blocked by the pipe member 13 enters the pipe member 13 when the water stops (see FIG. 9). Therefore, the internal passage 13a of the pipe member 13 cannot be used as a passage for injecting air into the expansion body 2, and a configuration for that purpose is required separately. Here, a through hole 13b is formed at the end of the tube member 13, and a through hole 13c is also formed at a position closer to the center than the through hole 13b. Further, the tube 7 from the air pump 8 is connected to the through hole 13 b on the end side, and the two through holes 13 b and 13 c are internally connected by a tube 15 disposed in the internal passage 13 a of the pipe member 13. . Thereby, the air from the air pump 8 is injected into the expansion body 2 through the tube 7, the through hole 13 b, the tube 15, and the through hole 13 c.

  FIG. 9 is a cross-sectional view of the sewer pipe P that is water-stopped by the water-stop packer 1 of FIG. As shown in FIG. 9, in the water stop state in which the expansion body 2 expands and the outer cylinder 3 is in close contact with the inner surface of the sewer pipe P, water is blocked on one side (right side in the figure) of the water stop packer 1. Yes. Further, the internal passage 13a of the pipe member 13 inserted into the expansion body 2 is closed by the valve 14 and water has entered from the right side in the drawing to the position of the valve 14.

  From this state, when the internal passage 13a of the pipe member 13 is opened by the valve 14, the water blocked on one side (right side in the figure) of the water stop packer 1 passes through the pipe member 13 on the other side (in the figure). To the left). Thus, by opening the internal passage 13 a of the pipe member 13 by the valve 14, the water that has been dammed can be gradually discharged from the pipe member 13. In addition, even during the work, the blocked water can be discharged as necessary. In particular, when the valve 14 is a ball valve, the amount of drainage can be easily adjusted. Moreover, since the pipe member 13 has shape retention, the pipe member 13 is not crushed by the pressure of the air injected into the expansion body 2 and the internal passage 13a is not blocked. The water that has been dammed can be discharged from the pipe member 13 while the air is being injected.

(Modification 3)
In the modified embodiment 2 (FIGS. 8 and 9), the pipe member 13 is provided with a configuration for injecting air into the expansion body 2, but the outer cylinder 3 may be directly provided with an air injection portion. Good. Specifically, as shown in FIG. 10, an air injection part 11 for injecting air into the expansion body 2 is provided, and this air injection part 11 is connected to a pump (not shown) for supplying air with a tube 12. Is done. And air is inject | poured into the expansion body 2 from the air injection part 11 using a pump. As shown in FIG. 10, it is preferable that the air injection part 11 is provided in the taper part 3c which connects the large diameter part 3a and the small diameter part 3b of the outer cylinder 3. As shown in FIG.

  Further, the air injection unit 11 will be specifically described with an example. However, the air injection part 11 is not restricted to the structure demonstrated below. FIG. 11 is a cross-sectional view of the air injection part 11. As shown in FIG. 11, the air injection part 11 is attached to the injection holes 2f and 3f formed in the expansion body 2 and the outer cylinder 3, and includes a flange member 20 having a flange part 20a and an injection pipe 20b. , A holding member 21, a plurality of bolts 22, and a bolt support member 23.

  The flange portion 20 a of the flange member 20 has a disk shape and is disposed inside the inflatable body 2. The injection tube 20b has a cylindrical shape, and protrudes outward from the flange portion 20a through the outer tube 3 in the injection hole 3f. An air supply tube 12 (see FIG. 10) is connected to the injection tube 20b. A screw portion 20c is formed on the outer peripheral surface of the injection tube 20b. The pressing member 21 is a disk-shaped member having a hole 21a through which the injection tube 20b is inserted in the central portion thereof. The pressing member 21 is disposed outside the outer cylinder 3 with the injection tube 20 b inserted therethrough, and sandwiches the expansion body 2 and the outer cylinder 3 together with the flange portion 20 a of the flange member 20.

  The bolt support member 23 is a disk-shaped member having a screw hole that is screwed into the screw portion 20c on the outer surface of the injection tube 20b at the center thereof, and is attached to a predetermined position in the length direction of the injection tube 20b. Further, a plurality of bolt holes 23 a into which the plurality of bolts 22 are screwed are formed in the vicinity of the outer periphery of the bolt support member 23. When the plurality of bolts 22 are screwed into the plurality of bolt holes 23a toward the holding member 21, respectively, the plurality of bolts 22 press the holding member 21 toward the outer cylinder 3, and the periphery of the injection holes 2f and 3f Is sandwiched between the flange portion 20a and the pressing member 21.

  According to this structure, since the expansion body 2 and the outer cylinder 3 can be firmly sandwiched between the pressing member 21 and the flange portion 20a of the flange member 20, the injection tube 20b for injecting air is provided. The flange member 20 can be securely attached to the expansion body 2 and the outer cylinder 3. In addition, since the portion around the injection hole 3f of the outer cylinder 3 is not twisted when sandwiched between the pressing member 21 and the flange portion 20a, the air injected into the expansion body 2 is injected into the injection tube 20b. Difficult to leak from the surroundings to the outside.

(Modification 4)
The water stop packer 1 of the modified embodiment 2 (FIG. 8) may further include a pipe joint for connecting the ends of the pipe member 13 to another water stop packer 1. As shown in FIG. 12, a valve 14 is provided at one end of the pipe member 13 of one water-stop packer 1 located on the left side in the drawing, and a pipe joint 16a is provided at the other end. Further, a pipe joint 16b is also provided at one end of the pipe member 13 of another water-stopping packer 1 located on the right side in the figure, and the end of the pipe member 13 is connected by the pipe joints 16a and 16b of the two water-stopping packers 1. It is possible to connect the parts and communicate the internal passages 13a (drainage channels) between the two parts.

  In order to surely stop the water in the sewer pipe P, it is necessary to block a certain length or more with the water stop packer 1, but if the total length of the water stop packer 1 is long, the sewer pipe P from the manhole H Installation work of the water stop packer 1 becomes difficult, for example, it becomes difficult to carry in the inside. However, according to this modified embodiment 5, a predetermined blocking length is secured by using a plurality of water-stop packers 1 connected in series while shortening the overall length of one water-stop packer 1. Can do.

  In addition, as shown in FIG. 12, the internal spaces of the expansion bodies 2 of the plurality of water-stop packers 1 may be connected in series by a tube 15. In this case, air can be sequentially injected from one air pump 8 into the plurality of expansion bodies 2.

(Modification 5)
In the embodiment and the modification thereof, air is injected into the expansion body 2. However, the expansion body 2 may be expanded by injecting a fluid other than air (for example, water or slurry).

(Modification 6)
The inflatable body 2 does not necessarily need to be a different diameter tubular woven fabric having a large diameter portion and a small diameter portion, and may be a straight tubular woven fabric whose diameter does not change over the entire length.

  As described above, as an embodiment of the present invention, the case where the water stop packer of the present invention is used for water stoppage of a sewer pipe has been described as an example, but the water stop target of the water stop packer of the present invention is limited to the sewer pipe. It can be used not only for water stoppage but also for other pipes.

DESCRIPTION OF SYMBOLS 1 Water stop packer 2 Expansion body 2a Large diameter part 2b Small diameter part 3 Outer cylinder 3e Annular projection 13 Pipe member 13a Internal passage 14 Valves 16a, 16b Pipe joint P Sewer pipe

Claims (14)

A water stop packer installed in the pipe to stop the pipe,
An inflatable body comprising a tubular woven fabric and capable of expanding in a radial direction when fluid is injected into the tubular woven fabric;
An outer cylinder made of an elastic body, covered with the expansion body, and having an inner diameter smaller than the maximum outer diameter of the expansion body;
A water-stopping packer characterized by comprising:   The said expansion body consists of a seamless woven fabric consisting of a plurality of warps and a weft woven continuously in a spiral shape with respect to these plurality of warps. Still water packer.   The inflatable body is composed of a cylindrical fabric having a different diameter, which has a large diameter portion and two small diameter portions which are provided at both ends of the large diameter portion in the cylinder axis direction and have a smaller diameter than the large diameter portion. The water-stopping packer according to claim 1 or 2, characterized in that   The waterstop packer according to claim 3, wherein an inner diameter of the outer cylinder is substantially equal to an outer diameter of a small diameter portion of the expanding body.   The waterproof cylinder according to any one of claims 1 to 4, wherein the outer cylinder is made of a rubber material.   The waterproofing packer according to any one of claims 1 to 5, wherein the expansion body is made of a high-strength polyethylene fiber.   The water-stop packer according to any one of claims 1 to 6, wherein a plurality of annular protrusions are provided on the outer peripheral surface of the outer cylinder at intervals in the cylinder axis direction. A tubular member having shape retention inserted through the inflatable body, and a valve capable of opening and closing an internal passage of the tubular member,
The waterproofing packer according to any one of claims 1 to 7, wherein both ends of the expansion body and the outer cylinder in the cylinder axial direction are fixed to the pipe member.   The water-stop packer according to claim 8, further comprising a pipe joint for connecting the ends of the two pipe members.   The water-stop packer according to claim 8 or 9, wherein at least a part of the pipe member has flexibility in a length direction.   The water-stop packer according to claim 10, wherein the pipe member is a tubular woven fabric whose inner and outer surfaces are coated with a resin.   The water stoppage packer according to any one of claims 1 to 11, wherein a length of the outer cylinder in a cylinder axial direction is longer than that of the expansion body. An installation step of installing the water-stopping packer according to claim 1 in the pipe;
An expansion step of injecting a fluid into the expansion body to expand the expansion body in a radial direction, and closely attaching the outer cylinder to the inner surface of the pipe;
A piping water-stopping method characterized by comprising: The water-stop packer has a pipe member inserted into the expansion body, a valve capable of opening and closing an internal passage of the pipe member, and both ends of the expansion body and the outer cylinder in the axial direction of the cylinder It is fixed to the pipe member,
2. The method according to claim 1, further comprising a drainage step of opening the internal passage of the pipe member by the valve and discharging the water in the pipe that has been stopped from the internal passage after the expansion step. The water stopping method for piping according to 13.

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