JP6147970B2 - Branch connection method - Google Patents

Description

  The present invention relates to a branch pipe connection method for connecting a branch pipe to a main pipe such as a drain pipe or a sewer pipe.

  FIG. 7 is a longitudinal sectional view showing a conventional branch pipe connection structure. The branch pipe connection structure shown in the figure includes a main pipe 50, a branch pipe 51 connected to the main pipe 50 in a T shape, and an attachment pipe 52 connected to the branch pipe 51.

  The main pipe 50 is made of synthetic resin, and an inner pipe 50b having a flat inner face 50a, and an outer pipe 50c in which angular waves (may be round waves) are spirally laminated on the outer face of the inner pipe 50b. It consists of and. In the figure, reference numeral 50d denotes an opening hole formed in the main pipe 50 in a circular shape. The mounting tube 52 is usually made of a synthetic resin tube with a spiral wave.

  As shown in the enlarged view of FIG. 8, the branch pipe 51 is made of a rubber material or an elastomer. As shown in an enlarged view of FIG. And a socket 51c formed at the rear end of the cylindrical main body 51a for connecting the mounting tube 52.

  A spiral groove 51d that can be screwed with the spiral wave portion of the mounting tube 52 is formed on the inner surface of the socket portion 51c.

  In order to form the above branch pipe connection structure, first, an opening hole 50d is formed in the main pipe 50 with a hole saw, and the cylindrical main body 51a is inserted into the main pipe 50 from the opening hole 50d while elastically deforming the elastic flange 51b. Then, the elastic collar portion 51b that has passed through the opening hole 50d is restored to its original umbrella shape. As a result, the outer peripheral edge 51 e of the elastic flange 51 b and the inner surface 50 a of the main pipe 50 are in close contact with each other, and the branch pipe 51 is connected to the main pipe 50. A sealing agent S such as a water expansion agent is injected into a gap (see FIG. 7) formed between the back surface 51f of the elastic flange portion 51b and the inner surface 50a of the main pipe 50, and the water is actively added after the connection is completed. The sealability is enhanced by injecting or inflating rainwater, groundwater or the like.

  Further, if an adhesive is applied to the outer peripheral edge portion 51e of the elastic flange portion 51b or the peripheral edge portion of the opening hole 50d, the sealing performance can be further improved (for example, see Patent Document 1).

JP 2009-52646 A

  However, in the conventional branch pipe connection structure, the connection of the branch pipe becomes insufficient depending on the ease of elastic deformation of the collar portion and the restoring ability, which causes a problem in the connection of the mounting pipe. Therefore, there is a problem that the hardness of the elastic flange portion 51b in the branch pipe 51 has to be adjusted without excess or deficiency and is difficult to manufacture.

  Specifically, if the hardness is too high, it becomes difficult to insert the main pipe 50 into the opening hole 50d and the workability is lowered. Conversely, if the hardness is too low, the insertion is easy, but after the insertion When the branch pipe 51 is pulled back in the direction opposite to the insertion direction in order to ensure the adhesion between the part 51b and the main pipe inner surface 50a by the sealing agent, the elastic flange part 51b comes out of the opening hole 50d. In addition, there is a problem that skill is required to apply the sealant or adhesive in place.

  The present invention has been made in consideration of the problems in the conventional branch pipe connection structure as described above, and it is necessary to specifically adjust the hardness so as to have both the hardness necessary for preventing the disconnection and the flexibility to adhere to the main pipe. The present invention provides a branch pipe connection method that can easily and reliably connect to the main pipe.

In the present invention, when connecting a branch pipe to a synthetic resin main pipe, an opening hole is formed in the branch pipe connection position in the synthetic resin main pipe,
Using a branch pipe provided with a collar part that can be elastically deformed at the tip part, and through the opening hole while elastically deforming the collar part,
The back surface of the collar portion whose shape has been restored by passing through the opening hole is closely attached to the peripheral edge portion of the opening hole,
This is a branch pipe connection method in which the outer surface of the collar portion is heated by a heating means, whereby the collar portion and the peripheral edge portion of the opening hole are thermally fused, and the synthetic resin main tube and the branch tube are connected.

  The branch pipe in the present invention means a pipe that is interposed between both pipes and functions as a joint when, for example, an attachment pipe is connected to the main pipe.

  In the present invention, the synthetic resin main pipe is a rehabilitation pipe inserted into the existing drain pipe for the purpose of rehabilitating the existing drain pipe buried in the ground.

  In the present invention, a mounting pipe can be further connected to the rear end portion of the branch pipe.

  The said attachment pipe means the pipe | tube which connects the main pipes, such as a drainage installation in a site, and a sewer pipe.

  In the present invention, d ′ / d is preferably in the range of 0.5 to 0.9, where d is the outer diameter of the flange and d ′ is the diameter of the opening hole.

  In the present invention, when the mounting pipe is made of a synthetic resin pipe with a spiral wave and has a socket part for connecting the mounting pipe to the rear end part of the branch pipe, the spiral groove formed on the inner surface of the socket part The branch pipe and the attachment pipe can be connected by screwing together the helical wave portion of the attachment pipe.

  In the present invention, it is desirable that the Shore A hardness of the heel portion is 30 to 90 Hs.

  In the present invention, the difference in melting point between the collar and the synthetic resin main tube is preferably 10 to 40 ° C.

  In the present invention, a cylindrical body that is in close contact with the inner wall of the mounting pipe is provided on the inner side of the socket portion, and the rear end portion of the cylindrical body projects from a connection side end portion of the mounting pipe in the socket portion. It is desirable to use

  According to the branch pipe connection method of the present invention, there is no need to adjust the hardness specially so as to have both the hardness necessary for preventing disconnection and the flexibility to adhere to the main pipe, and the branch pipe can be easily and reliably attached to the main pipe. It has the advantage that it can be connected.

  In addition, if the diameter of the main pipe opening hole / outer diameter of the flange portion is in the range of 0.5 to 0.9, the connection side end of the branch pipe does not bulge into the main pipe, so the cross section of the branch pipe connection portion is circular. In addition, the thickness of the ridge is reduced by heat fusion, and the ridge portion is substantially flush with the inner surface of the main pipe. Thereby, even if it connects a branch pipe, the effect that the flow volume fall of a main pipe | tube does not generate | occur | produce is acquired.

It is a longitudinal section showing a branch pipe connection structure concerning the present invention. It is a principal part enlarged view which shows the structure of the main pipe | tube shown in FIG. It is an enlarged view which has a partial cross section which shows the structure of the branch pipe of FIG. It is a decomposition | disassembly longitudinal cross-sectional view for demonstrating the branch pipe connection method of this invention. It is a perspective view which shows the structure of the branch pipe in other embodiment. It is explanatory drawing which showed the structure of the branch pipe of FIG. 5 in the partial cross section. It is a longitudinal cross-sectional view which shows the conventional branch pipe connection structure. It is an enlarged view which shows the structure of the branch pipe shown in FIG.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 is a longitudinal sectional view showing a branch pipe connection structure formed by the branch pipe connection method of the present invention. In the figure, a branch pipe connection structure 1 includes a branch pipe 3 connected in a T-shape to a body portion of a synthetic resin main pipe (hereinafter abbreviated as a main pipe) 2 with a spiral wave. Is connected to a synthetic resin attachment tube (hereinafter abbreviated as attachment tube) 4 with a spiral wave. Although details will be described later, in the present invention, when connecting the branch pipe 3 to the main pipe 2, after inserting an elastic flange 3b (FIG. 3 described later) of the branch pipe 3 into the main pipe 2, The heating means is pressed and thermally fused to the inner wall of the main pipe 2. Since the thickness of the elastic flange portion 3b is reduced by the fusion and becomes substantially flush with the inner wall of the main pipe 2, the elastic flange portion 3b is not shown in FIG.

1. Main pipe The main pipe 2 has an inner pipe 2b having a flat inner surface 2a and an outer pipe 2c laminated on the outer surface of the inner pipe 2b, as shown in the enlarged view of the main part of FIG. A reinforcing ridge 2d is wound spirally around the outer surface of the outer tube 2c.

1-1. Inner pipe In FIG. 2, the inner pipe 2b can be made of a thermoplastic resin excellent in chemical resistance, such as a vinyl chloride resin, a polyolefin resin, or an olefin-based or styrene-based thermoplastic elastomer.

1-2. Outer tube The outer tube 2c is molded from a thermoplastic resin that has good adhesiveness and chemical resistance to the inner tube 2b, such as styrene, olefin, nylon, polyester, polyamide, and polystyrene. can do.

1-3. The protruding ridge 2d is made of a material having the same or similar properties as the outer tube 2c, and is formed into a cylindrical shape in the manufacturing process of the main tube 2 and spirally wound around the outer surface of the outer tube 2c. At this time, the outer tube 2c is heat-sealed to be integrated.

1-4. Core material Core material 2e is extruded in the shape of a rod PE (polyethylene), PP (polypropylene), PPE (polyphenylene ether), PPS (polyphenylene sulfide), PEI (polyetherimide), PAR (polyarylate), PES (polyethersulfur) Hong), PEEK (polyetheretherketone), PTFE (polytetrafluoroethylene), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PA (polyamide), POM (polyacetal), saturated polyester and polymer blends thereof Any one of these is preferable, and the protrusion 2d is wound into the cylinder in the course of being formed into a cylinder.

  In FIG. 1, a circular opening 2f is formed in a portion of the main pipe 2 where the branch pipe 3 is connected.

2. Branch pipe The branch pipe 3 is made of a thermoplastic resin (for example, a composite material such as olefin-based elastomer, styrene-based elastomer, low-density polyethylene, EVA, etc.), and is formed of a cylindrical main body 3a inserted through the opening hole 2f of the main pipe 2. As shown in the enlarged view of FIG. 3, an elastic collar portion 3b formed in an umbrella shape is formed at the insertion-side distal end portion, and at the rear end portion (upper end portion in the drawing) of the cylindrical main body portion 3a. A socket portion 3c for connecting the mounting tube 4 is formed. In FIG. 3, the right half shows an appearance and the left half shows a longitudinal section with the central axis A of the branch pipe 3 as a boundary.

  The elastic flange 3b is formed so as to expand in a substantially horizontal direction from the lower end opening edge of the cylindrical main body 3a when the insertion direction is downward. Further, the elastic flange portion 3b is formed in an umbrella shape by curving in an arc shape toward the opposite side to the insertion direction, and is formed so that the thickness becomes thinner toward the outer peripheral side. Thereby, it can insert smoothly with respect to the opening hole 2f, and after passing through the opening hole 2f, it becomes easy to follow along the inner surface 2a of the main pipe 2.

  Further, when the outer diameter of the elastic flange 3b is d and the diameter of the opening hole 2f is d '(see FIG. 1), if d' / d is in the range of 0.5 to 0.9, the branch pipe Since the connection side end of the main pipe does not swell into the main pipe, the cross section of the branch pipe connecting portion on the main pipe inner wall can be maintained in a circular shape.

  When d ′ / d is less than 0.5, resistance increases when the branch tube 3 is inserted through the opening hole 2f, and workability decreases. On the other hand, if d ′ / d exceeds 0.9, the connecting side end of the branch pipe 3 slightly swells into the main pipe 2, which may reduce the flow rate of the main pipe 2.

  Further, a spiral groove 3d that can be screwed with the spiral wave portion of the mounting tube 4 is formed on the inner surface of the socket portion 3c formed at the rear end portion of the cylindrical main body portion 3a.

3. Attachment Tube In FIG. 1, the attachment tube 4 has an inner tube 4a having a flat inner surface, and an angular wave portion 4b is formed on the outer surface in a spiral shape in the tube axis direction. In addition, the attachment pipe whose inner surface is not flat is also included in the present invention.

  When the angular wave part (spiral wave part) at the connection side end of the attachment pipe 4 is screwed into the spiral groove 3d formed in the socket part 3c of the branch pipe 3, the attachment pipe 4 and the branch pipe 3 are connected to each other. The inner wall of the pipe 4 and the inner wall of the branch pipe 3 are flush with each other. In addition, when connecting the branch pipe 3 to the main pipe 2, the attachment pipe 4 is connected to the branch pipe 3 in advance.

4). Branch Pipe Connection Method Next, the branch pipe connection method of the present invention will be described with reference to FIG.

  In the following description, the main pipe 2 to be connected to the branch pipe is a so-called rehabilitation pipe that is inserted into an existing concrete sewer pipe (hereinafter referred to as a sewer pipe) 5 and used as a new sewer pipe. Although the case where a branch pipe is connected will be described as an example, the branch pipe connection method of the present invention can be applied not only to such a rehabilitation pipe but also to a case where a branch pipe is connected to a new underground pipe. In the figure, reference numeral 6 denotes a sewer branch pipe branched from the sewer pipe 5.

  First, an opening hole 2f is drilled in the branch pipe connecting portion of the main pipe 2 by a robot. Next, the connection side end of the branch pipe 3 to which the attachment pipe 4 is connected is inserted into the sewer branch pipe 6 and guided in the direction of arrow B to the opening hole 2f.

  When the connection side end of the branch pipe 3 reaches the opening hole 2f and the elastic flange 3b contacts the edge of the opening hole 2f, the elastic flange 3b is elastically deformed in the direction of arrow C. The elastically deformed elastic flange 3b returns to the original state (opened in an umbrella shape) when passing through the opening hole 2f.

  In order to perform such connection work, it is desirable that the elastic flange 3b has a lower hardness than the branch pipe 3 and the main pipe 2. Specifically, the elastic flange portion 3b, the main pipe 2 and the cylindrical main body portion 3a are preferably 30 to 90, more preferably 50 to 70, as Shore A hardness (Hs).

  Next, when the branch tube 3 is slightly pulled back in the direction opposite to the insertion direction (arrow B direction), the annular back surface 3e (see FIG. 3) of the elastic flange portion 3b comes into contact with the peripheral portion of the opening hole 2f.

  The elastic flange 3b only needs to be in contact with the peripheral edge of the opening hole 2f, and does not require a large pull-back force as in the case of connection using an adhesive. Therefore, since it is not necessary to consider the dropout of the branch pipe 3, it is not necessary to adjust the strict hardness when manufacturing the branch pipe, and the manufacture of the branch pipe is simplified. Further, since the elastic flange portion of the branch pipe is slightly deformed by heat fusion and connected to the main pipe, there is an advantage that the degree of freedom of dimensional accuracy is increased. In this state, the heating means is pressed against the annular outer surface 3f of the elastic flange portion 3b to heat it.

  The heated elastic flange 3b is heat-sealed with the inner surface 2a of the main pipe 2, and as a result, the branch pipe 3 and the main pipe 2 are connected. In addition, the thickness of the ridge is reduced by heat fusion, and the ridge portion is substantially flush with the main pipe inner surface.

  In the present invention, since the above-described heat fusion method is performed, as a preferable condition, a material can be selected and examined in consideration of the thermal behavior of each component, specifically, the melting point. More specifically, the melting point of the elastic flange 3b is lower by about 10 to 40 ° C. than the melting points of the cylindrical main body 3a and the main pipe 2.

  As a material of the inner pipe 2b and the branch pipe 3 of the main pipe 2, for example, when polyethylene is used, a preferable heating temperature is 100 to 150 ° C. and a heating time is 15 to 50 minutes. It should be determined appropriately in consideration of the difference in melting point. In addition, the said heating means can be comprised with the heater mounted in the robot which can move the inside of the main pipe 2 by winding of a wire, for example, The heater is cyclic | annular in the elastic collar part 3b with a raising / lowering apparatus. It can heat by making it contact with the outer surface 3f and supplying with electricity.

  In the above embodiment, the case where the branch pipe 3 is connected in a T shape to the main pipe 2 has been described as an example. Needless to say, the branch pipe connection of the present invention is also applicable when the branch pipe 3 is connected obliquely to the main pipe 2. Included in the method.

5). Other Embodiments FIG. 5 is a perspective view showing a configuration of the branch pipe 3 in another embodiment, and FIG. 6 is an explanatory view showing a part of the configuration of the branch pipe 3 in FIG.

  In FIG. 5, the cylindrical body 3g can be provided concentrically inside the socket portion 3c. A mounting tube 4 (FIG. 4) can be inserted and connected between the outer wall of the cylindrical body 3g and the inner wall of the socket portion 3c. As the material of the cylindrical body 3g, polyethylene or a thermoplastic resin (for example, a composite material such as olefin elastomer, styrene elastomer, low density polyethylene, EVA, etc.) can be used.

  The rear end portion of the cylindrical body 3g can protrude from the connection side end portion (upper end portion in the drawing) of the socket portion 3c. The height of the protruding portion of the cylindrical body 3g can be set to 10 to 20 mm, for example.

  By providing the cylindrical body 3g, the inner wall of the mounting pipe 4 (FIG. 4) and the outer wall of the cylindrical body 3g can be brought into close contact with each other, the adhesion between the branch pipe 3 and the mounting pipe 4 can be further improved, and the branch pipe The water stoppage between 3 and the attachment tube 4 can be improved. In order to further increase the water-stopping property, a water-stopping agent 30 can be filled between the inner wall of the socket portion 3c and the outer wall of the cylindrical body 3g in FIG.

  1 is not provided with the cylindrical body 3g, the area where the inner wall of the mounting pipe 4 is restrained by the branch pipe 3 can be reduced, and the flexibility (flexibility) of the mounting pipe 4 can be improved. Can do. Accordingly, when the sewer branch pipe 6 (FIG. 4) into which the attachment pipe 4 is to be inserted is not linear but has a meandering shape, the attachment pipe 4 can be easily advanced forward.

  On the other hand, when the cylindrical body 3g is provided, the binding force of the mounting pipe 4 by the cylindrical body 3g can be increased as compared with the connection structure of the branch pipe 3 in FIG. For this reason, the wave | undulation of the attachment pipe 4 decreases, and when the sewer branch pipe 6 is linear shape, there exists an advantage which becomes easy to advance the attachment pipe 4 forward.

DESCRIPTION OF SYMBOLS 1 Branch pipe connection structure 2 Main pipe 2a Inner surface 2b Inner pipe 2c Outer pipe 2d Rib 2e Core material 2f Opening hole 3 Branch pipe 3a Cylindrical main-body part 3b Elastic hook part 3c Socket part 3d Spiral groove 3e Annular back surface 3f Annular outer surface 3g Cylindrical body 4 Mounting pipe 4a Inner pipe 4b Square wave part 5 Sewer pipe 6 Sewer branch pipe

Claims (7)

When connecting a branch pipe to a synthetic resin main pipe, an opening hole is drilled at the branch pipe connection position in the synthetic resin main pipe,
An eaves portion that can be elastically deformed, has an umbrella-like shape that is curved in an arc shape toward the opposite side of the insertion direction and is thinner toward the outer peripheral side, and has an outer diameter of the eaves portion. d, where the diameter of the opening hole is d ′, a branch pipe having a flange portion at the tip portion where d ′ / d is in the range of 0.5 to 0.9 is used, and the flange portion is elastically deformed. While passing through the opening hole,
The back surface of the collar portion whose shape has been restored by passing through the opening hole is closely attached to the peripheral edge portion of the opening hole,
By heating the outer surface of the collar with a heating means, the collar and the peripheral edge of the opening hole are heat- sealed, and the collar is deformed from an umbrella-like shape by heat-sealing. And connecting the synthetic resin main pipe and the branch pipe by reducing the thickness of the branch pipe.   The branch pipe connection method according to claim 1, wherein the synthetic resin main pipe is a renovated pipe inserted into the existing drain pipe for the purpose of rehabilitating the existing drain pipe buried in the ground.   The branch pipe connection method according to claim 1 or 2, wherein an attachment pipe is further connected to a rear end portion of the branch pipe.   The mounting pipe is made of a synthetic resin pipe with a spiral wave, and has a socket part for connecting the mounting pipe to the rear end part of the branch pipe, and the mounting pipe is formed in a spiral groove formed on the inner surface of the socket part. The branch pipe connection method according to claim 3, wherein the branch pipe and the attachment pipe are connected by screwing together the helical wave portions.   A cylindrical body that is in close contact with the inner wall of the mounting pipe is provided inside the socket section, and the branch pipe in which a rear end portion of the cylindrical body projects from a connection side end section of the mounting pipe in the socket section is used. 4. The branch pipe connection method according to 4. The branch pipe connection method according to any one of claims 1 to 5 , wherein a difference in melting point between the flange and the synthetic resin main pipe is 10 to 40 ° C. The branch pipe connection method according to any one of claims 1 to 6, wherein d '/ d is within a range of 0.5 to 0.9 (excluding 0.5).

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