JP3091005U - Flexible joint for branch for sewer pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible joint for sewage pipe branching for a sewer pipe, which has a simpler structure, quicker construction, and improved durability and water stoppage. SOLUTION: A rubber joint body 11 having a skirt portion 14 in close contact with the wall surface of a main pipe 1 and a cylindrical portion 15 in close contact with the wall surface of a branch pipe 2, and a tightening band 1 for tightening the skirt portion 14 to the main pipe 1
2 and a flexible joint 10 comprising a tightening band 13 for tightening the tubular portion 15 to the branch pipe 2. The cylindrical portion 15 forms an enlarged diameter portion 17 in the attachment portion 3 with the main pipe 1 to increase strength, and forms a bellows-like portion 16 on an outer surface near the attachment portion 3 to increase flexibility, and further,
An iron plate 21 is incorporated in the skirt portion 14 on the surface in close contact with the wall surface of the main pipe 1 to enhance durability. In addition, the skirt portion 14 and the cylindrical portion 15 are provided with convex and concave portions 22 on the contact surface between the main tube 1 wall surface and the branch tube 2 wall surface,
Further improves the water stoppage.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention is for branching used when branching a branch pipe by drilling an insertion hole in the main sewer pipe. The present invention relates to a flexible joint.

[0002]

[Prior art]

  Since the sewer pipe sends the sewage in the pipe by gravity flow, wasteful head loss to the treatment plant is avoided. The pipes are arranged and buried to reduce the number of pipes, but the pipe diameter, the change point of the gradient, and the pipe The branch pipe may branch to the sewer main at the confluence. Usually a sewer main Is drilled on the wall surface, and a flexible joint for branching is inserted in this insertion hole to branch the branch pipe. I am letting you. However, since the sewer pipe is buried in the ground, the seismic shaking and Due to earth pressure such as subsidence, bending may be applied near the attachment part between the main pipe and the branch pipe. . If the mounting part loses this bending, the axis of the pipe at the mounting part will come off and , Damage, etc. may occur, and further, intrusion water and water leakage may occur at the mounting part. Therefore, it is not preferable. For this reason, the sewer main is subject to earth pressure applied near the attachment to the branch pipe. With respect to bending due to bending, etc., a flexible joint for branching is used to provide waterproofness and flexibility. I try not to lose the power of.

[0003]   In the conventional known technology, the flexible joint is made of an elastic member such as rubber and is When an external force is applied to the part connecting the pipes, it is flexible so as to absorb this external force ( Elasticity). At this time, the thickness of the tubular part of the flexible joint inserted in the insertion hole should be adjusted appropriately. By selecting it properly, the tubular part is partially compressed when the axis of the pipe comes off, and mounting The force applied to the part may be absorbed. In addition, the flexible joint blocks the surface that contacts the pipe. Chilled to improve corrosion resistance, acid resistance, weather resistance, and reduce fluid permeability In some cases, the adhesion may be further improved. Also, a flexible joint connects two pipes At that time, usually, using a stainless steel tightening band, tighten the joint body and the pipe, Prevents slipping out. At this time, attach it to the groove formed on the inner wall of the tubular part of the flexible joint. The expansion band tightens the inner surface of the flexible joint and presses the tubular portion against the inner wall of the insertion hole. It may come into contact with the surface to increase the waterproofness.   Thus, conventionally, when connecting two pipes using a flexible joint, Various improvements have been made to improve the adhesion of flexible joints in. Only However, while improving the adhesion of the flexible joint, this structure and construction work are complicated. When doing so, there are advantages and disadvantages that the installation work takes time.

[0004]   Related to the branch flexible joint for sewer pipe, when connecting the sewer pipe to the manhole As a prior art relating to a flexible joint for manhole to be used, for example, Japanese Patent Laid-Open No. 2000- The invention disclosed in Japanese Patent No. 220161 can be mentioned.   The flexible joint for manholes disclosed in Japanese Patent Laid-Open No. 2000-220161 is a The cylindrical hole that is inserted when connecting the main pipe to the insertion hole formed on the wall surface of the main body. A flexible joint, which is flexible according to the arc shape of the wall surface of the manhole body. An annular curved groove is formed on the outer peripheral surface of the joint, and an elastic bag is installed in the curved groove. Urethane synthetic resin is press-fitted and filled. This allows the manhole body to be inserted Uniform pressure is applied to the inner wall surface of the hole to improve adhesion. Also, press-fit and fill Construction is facilitated by using low pressure.

[0005]

[Problems to be solved by the device]

  The flexible joint for manholes disclosed in Japanese Patent Laid-Open No. 2000-220161 is a It has an excellent effect of improving the adhesion when connecting the main pipe to the hole. However, however, an elastic bag is installed in the curved groove and urethane synthetic resin is placed in this. Since the work of press-fitting and filling is required, the structure is always simple and construction is required. Could not be done quickly. For this reason, the structure is further simplified in the past. At the same time, there has been a demand for a flexible joint that can be quickly constructed.

[0006]   The present invention has been made in view of the above points, and an object of the present invention is to improve the structure. It is easy and quick to install, and has improved durability and water resistance. It is an object to provide a flexible joint for branching for a water pipe. In addition, if necessary An object is to provide a flexible joint for branching for sewer pipes that can be easily removed. .

[0007]

[Means for Solving the Problems]

  In order to achieve the above object, a flexible branch for sewer pipe according to claim 1 The joint is for branching to install a branch pipe by inserting it into an insertion hole drilled in the wall of the sewer main. A flexible joint, wherein the skirt portion that comes into close contact with the wall surface of the main pipe and the wall surface of the branch pipe A rubber joint body having a cylindrical portion that closely adheres, and the skirt portion on the wall surface of the main pipe. A tightening band for tightening and a tightening band for tightening the tubular portion on the branch pipe. The cylindrical portion expands the diameter of the mounting portion to the main pipe, and the cylindrical portion is A bellows-like portion is formed on the outer surface near the attachment portion, and the skirt portion is formed on the main pipe. It is characterized in that a steel plate is built in the surface closely attached to the wall.   With this configuration, it is possible to use the Construction of a flexible joint for branching for water pipes and this removal work are speeded up, and the joint book The body is made of rubber, and the expanded diameter part and the bellows part are provided near the attachment part of the tubular part. By forming it, even if external force is applied near the attachment part, the bellows-like part Partly compressed to absorb the force applied to the mounting part and less affected by earth pressure, , A steel plate is built inside the joint body to improve durability.

[0008]   The invention according to claim 2 is the device according to claim 1, wherein the scar The outer peripheral surface of the main portion is formed with a convex and concave portion in the circumferential direction, which is in close contact with the main pipe. It   With this configuration, the convex and concave portions formed on the inner surface side of the skirt portion are Since the mesh with the outer wall of the pipe is good, the skirt part using the tightening band and the main pipe Improving the waterproofness of the contact surface of the, it is less susceptible to rainwater and groundwater To do.

[0009]   Further, the invention according to claim 3 is the same as the invention according to claim 1 or 2, The cylindrical portion is characterized in that a ring-shaped convex / concave portion is formed on the inner surface side in close contact with the branch pipe. And   With this configuration, the projections and recesses formed on the inner surface of the tubular portion can prevent the outside of the branch pipe. Since the engagement with the wall is good, the contact surface between the tubular part and the branch pipe using the tightening band Improve the water stoppage in the area and make it less susceptible to rainwater and groundwater.

[0010]   The flexible joint for branching of the sewer pipe according to the present invention is basically constructed as described above. However, preferably, this flexible joint is made of PVC pipe, fume pipe, super sleeve pipe, ceramic The branch pipe is branched by being inserted into an insertion hole formed in the sewer pipe of the pipe. At this time, flexible If you want to improve durability by incorporating an iron plate as a reinforcing member in the joint, You may use the metal member of. Also, when incorporating a reinforcing member, waterproof this surface. You may give me work. Furthermore, the method of incorporating the reinforcing member in the rubber joint body is optional. For example, a rubber member is attached to an iron plate by injection molding to form a joint book. It may form a body. However, in another embodiment according to the present invention, the skirt portion is Instead of incorporating the iron plate, place the iron plate outside the skirt and tighten the tightening band. By tightening with, the skirt part is brought into close contact with the outer wall of the main pipe, and the flexible joint The durability of may be reinforced.

[0011]

[Embodiment of device]

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.   However, in the present specification, the term “main pipe” is defined as referring to a sewer pipe in a broad sense. The term “branch” is defined as a broad sense of the tube connected to the side wall of the main.

[0012]   FIG. 1 is a perspective view showing a branch flexible joint 10 for a sewer pipe according to an embodiment of the present invention. It is a perspective view and is inserted in an insertion hole (not shown) formed in the wall surface of the sewer main 1, The state which attaches the branch pipe 2 to an insertion hole is shown. However, the branch pipe 2 is within the sewer main pipe 1. The mounting end (not shown) is cut along the wall.   As shown in the figure, a flexible joint 10 according to an embodiment of the present invention includes a joint main body 11, The main pipe 1 is composed of a main band tightening band 12 and a branch line tightening band 13. On the other hand, the branch pipe 2 is branched. At this time, the flexible joint 10 has waterproofness and flexibility, Installation of sewer main 1 that is buried underground due to earth pressure such as shaking of the earthquake or uneven settlement Even when bending is applied to the portion 3, the axis of the branch pipe 2 is dislocated from the mounting portion 3. The flexible joint 10 absorbs the action to prevent the pipe from being flattened or broken. In addition to the prevention, the mounting portion 3 is prevented from invading water and leaking water.

[0013]   FIG. 2 is a partial cross-sectional view taken along line II-II of the branch flexible joint 10 shown in FIG. The left half shows a sectional view of the flexible joint 10, and the right half shows a side view thereof. However 2 does not show the tightening bands 12 and 13 shown in FIG.   Here, referring to FIG. 1 and FIG. 2, the flexible joint 10 according to the embodiment of the present invention will be described. The usage method will be briefly described. First, for the insertion hole drilled in the main pipe 1 , The extension portion 19 of the joint body 11 is fitted, and the skirt portion of the joint body 11 (main pipe mounting Scratch part 14 is brought into close contact with the outer wall of the main pipe 1, and the tightening band 12 for the main pipe is used for scarring. The tongue portion 14 is fixed to the outer wall of the main pipe 1. Next, the tubular portion of the joint body 11 (branch pipe Abutment part 15 to bring branch pipe 2 into contact with stop surface (stopper) 20 of joint body 11. Insert the tube up to the outer wall of the branch pipe 2 using the tightening band 13 for the branch pipe. Fix it. With this construction, the present invention branches the branch pipe 2 into the sewer main pipe 1.   Hereinafter, the flexible joint 10 according to the embodiment of the present invention will be described in more detail.

[0014]   First, the external shape of the flexible joint 10 will be described with reference to FIGS. 1 and 2. The flexible joint 10 has a cross section such that one side of the main body 11 can be brought into close contact with the outer wall of the main pipe 1. A skirt portion (flange portion) 14 formed in a substantially arc shape is provided. Furthermore, the main body 11 On the other hand, a cylindrical portion (branch pipe) formed in a substantially cylindrical shape so as to be able to closely contact the outer wall of the branch pipe 2. (Mounting part) 15. At this time, it is preferable that the skirt portion 14 and the cylindrical portion 15 be To extend in a substantially vertical direction. Also, preferably, the circumferential length of the skirt portion 14 is The main tube 1 is configured to be wound around a half circumference.

[0015]   In the embodiment of the present invention, the body 11 of the flexible joint 10 is made of an elastic body such as a rubber member. To manufacture. At this time, the flexible joint 10 is butyl-treated on the surface in contact with the pipe and It is more difficult to vulcanize than using materials, and it is more resistant to corrosion, acid, and weather. The adhesion may be improved by improving the fluid permeability and reducing the fluid permeability. Furthermore In addition, as shown in FIG. 1, in the vicinity of the attachment portion 3 on the outer surface of the tubular portion 15, the cross section has an arc shape. Several convex parts (small mountain parts) are continuously formed on the bellows part 16 to enhance flexibility and mount. When an external force is applied to the case portion 3, the tubular portion 15 is partially compressed by the bellows-like portion 16 ( (Not shown) absorbs the force applied to the mounting portion 3.   Further, as shown by reference numeral 17 in FIG. 2, the thickness of the mounting portion 3 of the tubular portion 15 is increased. Thus, the strength of the mounting portion 3 of the main body 11 of the flexible joint 10 is partially improved. In the illustrated embodiment, the tubular portion 15 is adjacent to the expanded diameter portion 17 and has three Although the bellows-like portions 16 composed of the convex portions are juxtaposed, the number of the convex portions and the enlarged diameter portion 17 The axial length of is properly selected according to the embodiment. For example, the attached FIG. It is a figure which shows other embodiment which concerns on this invention, and as shown in FIG. The length may be appropriately extended to further increase the strength in the vicinity of the mounting portion 3.

[0016]   Further, as can be understood from FIG. 2, in the embodiment according to the present invention, the diameter expansion is performed. An extension 19 extending toward the inner wall of the main pipe 1 is formed at the end of the portion 17. Joint body 1 1 is inserted from this extension 19 into an insertion hole to be drilled on the side wall of the main pipe 1. , The side surface of the extension portion 19 is in close contact with the end portion (not shown) of the insertion hole, Position main tube 1 in place. Also, this extension portion 19 is substantially opposite to the longitudinal direction. A stop surface (stopper) 20 is formed in the direction, and the branch pipe 2 is installed toward this stop surface 20. wear.   Thus, the extension portion 19 of the flexible joint 10 that fits into the insertion hole of the main pipe 1 is The inner surface of the skirt portion 14 and the tubular portion 15 are located inside the outer wall and outside the main pipe 1. The enlarged diameter portion 17 is aligned with the outer peripheral surface of the main pipe 1, and further covers the branch pipe 2 from the enlarged diameter portion 17. The tubular portion 15 that extends is formed.   However, the skirt portion 14 and the tubular portion 15 may be integrally formed, or The joint body 11 may be formed as a separate body from each other and attached appropriately.

[0017]   Further, as described above, the main body tightening band 12 and the branch pipe are provided separately from the main body 11. Using the tightening band 13, the main body 11 is tightened to the main pipe 1 and the branch pipe 2. . Specifically, as shown in FIG. A band groove (concave portion) 18a is provided to position the band 12 at a fixed position. It However, it is preferable that the two groove portions 18a be provided near the left and right ends of the skirt portion 14, respectively. Form it so that the joint 10 is closely attached to the main pipe 1 from the left and right of the skirt portion 14. The main tightening band 12 is wound around the groove 18a. Similarly, FIG. As shown in FIG. 3, the substantially cylindrical shape 15 of the joint 10 has the branch pipe tightening band 13 at a fixed position. For positioning, a band groove portion (concave portion) 18b is provided near the insertion port of the branch pipe 2. Set up. At this time, the two branch pipe tightening bands 13 are juxtaposed to each other so that they are wound in a groove. The portions 18b may be formed side by side to increase the tightening force of the tightening band 13. .   The tightening bands 12 and 13 are preferably made of stainless steel, and It is known in the art. Also, concrete tightening of the tightening bands 12 and 13 The means is not limited.

[0018]   1 to 3, a flexible joint 10 according to an embodiment of the present invention is provided. The new features will be described.   As shown in FIG. 2, in the embodiment according to the present invention, the skirt portion 14 made of rubber is An iron plate 21 is built in as a reinforcing member on the contact surface with the main pipe 1. In addition, the thickness of the iron plate 21 It is thin and has a diameter that allows close contact with the outer wall of the main tube 1. Also, the joint body 11 The method of incorporating the iron plate 21 in the inside is arbitrary.   Therefore, in the past, most flexible joints have been provided with a flange on a rubber body, The fitting part was inserted inside the insertion hole, and the fitting body was assembled to the main pipe. Then, in the embodiment according to the present invention, the contact surface of the skirt portion (main pipe mounting portion) is subordinated. It is larger than the conventional flange and has a built-in reinforcing member 21, which allows it to be attached to the outer wall of the main pipe. By mounting it against, the durability is enhanced.

[0019]   In addition, as shown in FIG. 2, the joint body 11 has a skirt portion 1 in contact with the outer wall of the main pipe 1. For the main pipe, a plurality of circumferentially extending convex-concave lines (concave-concave portions) 22 are formed on the inner surface side of When tightening the skirt portion 14 to the main pipe 1 using the tightening band 12, Improve the tightening effect. That is, by forming the uneven line 22 When the outer wall of the pipe 1 and the inner surface of the skirt portion 14 come into close contact with each other, the roughness of the surface of the outer wall of the main pipe 1 (shown in the figure) By engaging the uneven line 22 with each other, the adhesion effect between both is enhanced. However, The size and the number of the groove portions forming the uneven line 22 are appropriately determined according to the embodiment. Can be In addition, by incorporating the iron plate 21 in the skirt portion 14, By increasing the weight of 14, the close contact effect between the skirt portion 14 and the outer wall of the main pipe 1 Is even higher.   Further, as shown in FIG. 3, the joint body 11 has a tubular portion 15 that contacts the outer wall of the branch pipe 2. A plurality of ring-shaped (circumferential) extending convex-concave lines (concave-concave) 23 are formed on the inner surface side of And when tightening the tubular portion 15 to the branch pipe 2 using the branch pipe tightening band 13. In addition, this tightening effect is improved. That is, by forming the uneven line 23, When the outer wall of the branch pipe 2 and the inner surface of the tubular portion 15 come into close contact with each other, the roughness of the surface of the outer wall of the branch pipe 1 (Fig. (Not shown) meshes with the convex-concave line 22 to enhance the adhesion effect between the two. However The size and the number of the groove portion forming the uneven line 23 are appropriately set according to the embodiment. Determined.   Therefore, the uneven lines 22 and 23 provide good meshing between the main pipe 1 and the outer wall of the branch pipe 2. , Tighten the joint body 10, main pipe 1 and branch pipe 2 using the tightening bands 12 and 13. It can be made stronger and less susceptible to rainwater and groundwater.   In addition, in another embodiment according to the present invention, the uneven lines (concave / concave) 22 and 23 are not always used. It is not necessary to form a straight line in the circumferential direction, but to form a tooth shape or a wavy shape (not shown) You may. Furthermore, instead of forming the uneven lines (projecting and recessing) 22 and 23, Random uneven surfaces (not shown) may be formed.

[0020]   As described above with reference to the attached drawings, for branching according to the embodiment of the present invention. The flexible joint 10 configures the joint main body 11 simply, and also includes the reinforcing member (iron plate). ) 21 and convex-concave lines (concave-concave) 22 and 23 are newly provided, thereby simplifying the structure. Providing a flexible joint that improves durability and water resistance while enabling quick construction To serve.

[0021]   In the test conducted by the applicant of the present invention, the flexible joint 10 is attached to the sewer main. When the branch pipe is diverged by mounting the pipe, the branch pipe undergoes a bending displacement of 20 ° and the external water pressure is 0. Even when a load of 1 MPa is applied, the flexible joint 10 according to the embodiment of the present invention leaks water. Not allowed to do.   Furthermore, when the flexible joint 10 is attached to the sewer main and the branch pipe is branched, The outer diameter of the branch pipe made of a pipe was flattened by 5%, and the water pressure was 0.1 MPa. Even in this case, it is recognized that the flexible joint 10 according to the embodiment of the present invention does not leak water. It was   Therefore, these tests show that the flexible joint 10 according to the embodiment of the present invention is sufficient. It was recognized that it has sufficient practicality.

[0022]   The branch flexible joint 10 according to the embodiment of the present invention is configured as described above. Furthermore, when branching a branch into the sewer main, the number of products lined up for each application is set to about 5 types. By limiting the price, it becomes possible to further reduce the price, and it has further practicality. It was recognized that

[0023]

[Effect of device]

  As described above, according to the invention described in claim 1, the tightening band is wound. Just attach it to quickly install and remove the flexible joint for branching for sewer pipes. In addition, the joint body is made of rubber and expanded near the attachment part of the tubular part. By forming the diametrical part and the bellows part, when external force is applied near the mounting part Also, the bellows part is partially compressed to absorb the force applied to the mounting part, and it is affected by earth pressure. It can be made harder and a steel plate can be built inside the joint body to improve durability.

[0024]   Further, according to the invention described in claim 2, in addition to the above effects, the inner surface side of the skirt portion The concavo-convex shape formed on the top allows for good meshing with the outer wall of the main pipe. Improving the waterproofness at the contact surface between the used skirt and the main pipe to prevent rainwater or groundwater It can be less affected by the above.

[0025]   Further, according to the invention described in claim 3, in addition to the above effects, the inner surface side of the tubular portion is Use the tightening band because the formed concavities and convexities make good engagement with the outer wall of the branch pipe. It improves the waterproofness of the contact surface between the tubular part and the branch pipe, and protects against shadows from rainwater and groundwater. You can make it harder to receive the sound.

[Brief description of drawings]

FIG. 1 is a perspective view showing a flexible joint for branching according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a sectional view showing a flexible joint for branching according to another embodiment of the present invention.

[Explanation of symbols]

1 main (sewer pipe) 2 branch pipes 10 Flexible joint 11 Joint body Tightening band for 12 mains 13 Tightening band for branch pipe 14 Skirt part (main pipe mounting part) 15 Cylindrical part (branch pipe mounting part) 16 Bellows 17 Expanded part 18a, 18b Groove (concave) 19 Extension 20 Stopping surface (stopper) 21 Iron plate (reinforcing member) 22, 23 Concavo-convex line (concave-concave)

Claims (3)

[Scope of utility model registration request] 1. A flexible joint for branching, which is inserted into an insertion hole formed in a wall surface of a sewer main pipe to mount a branch pipe, and a skirt portion closely contacting the wall surface of the main pipe and a wall surface of the branch pipe. And a tightening band for tightening the skirt portion on the wall surface of the main pipe, and a tightening band for tightening the cylindrical portion on the branch pipe, the tubular portion being the main pipe. While expanding the diameter of the mounting portion of the and, the tubular portion forms a bellows-shaped portion on the outer surface near the mounting portion, and further, the skirt portion has a built-in iron plate on the contact surface with the main wall surface. A flexible joint for branching. 2. The flexible joint for branching according to claim 1, wherein the skirt portion has a convex-concave portion in the circumferential direction formed on the inner surface side in close contact with the main pipe. 3. The branching flexible joint according to claim 1, wherein the tubular portion has a ring-shaped convex-concave portion formed on the inner surface side that is in close contact with the branch pipe.