JP5486910B2 - Pipe connection device - Google Patents

Description

  The present invention provides a watertight seal for a covering portion for covering a fluid pipe, an opening portion having an opening edge along the opening edge of the branch opening formed in the fluid pipe, and a perforator or a branch pipe for forming the branch opening. The present invention relates to a pipe connection device that includes a connection part that is openably connectable to the fluid pipe, and an on-off valve part that can communicate the opening and the connection part.

  A conventional pipe connection device includes a connection portion provided on an inner peripheral surface for engaging with a branch pipe when the branch pipe is connected, and a perforator is connected to the connection portion to provide a branch port for the fluid pipe. Perforated (see, for example, Patent Document 1).

Japanese Patent No. 4162063 (page 5, FIG. 5)

  However, in Patent Document 1, chips generated when a branching hole is drilled in a fluid pipe by a punching machine enters an engaging part that engages with a branching pipe provided in a connecting part. There is a problem that the chips remaining in the engaging portion are interposed between the branch pipe and the watertightness cannot be maintained.

  The present invention has been made paying attention to such a problem, and the engaging portion engages with the branch pipe without causing trouble due to the ingress of chips, and the pipe that can connect the branch pipe to the connecting portion in a watertight manner. An object is to provide a connection device.

In order to solve the above-mentioned problem, the pipe connection device of the present invention includes:
A watertight connection can be made between a covering portion for covering a fluid pipe, an opening portion having an opening edge along the opening edge of the branch opening formed in the fluid pipe, and a drilling machine or a branch pipe for making the branch opening. A connection part that is connected to the fluid pipe in a watertight manner, and a connection part that is open to the fluid, and an on-off valve part that can communicate the opening part and the connection part.
An engagement portion that engages with the branch pipe when the branch pipe is connected is provided on the inner peripheral surface of the connection section, and prevents chips from entering the engagement section when the drilling machine is connected. cylindrical body to have, is interposed between said punches and said engaging portion, so that the tip end circumferential face of the cylindrical body, in close contact with the reduced diameter inner surface of said opening and closing valve side of the connecting portion It is characterized by being composed .
According to this feature, the tubular body is interposed between the perforator and the inner peripheral surface of the connection portion , and the tip peripheral surface thereof is in close contact with the reduced diameter inner surface of the connection portion on the on-off valve side. By being configured, it is possible to easily prevent chips from entering the engaging portion when the branch port is drilled by the drilling machine, so that the engaging portion enters the chip after the branch port is drilled. Therefore, it is possible to engage the branch pipe without causing a problem and to connect the branch pipe to the connecting portion while maintaining watertightness.

The pipe connecting device of the present invention is
The cylindrical body is characterized in that a close contact member is provided on a distal end peripheral surface of the connecting portion that contacts the opening / closing valve portion side with respect to the engaging portion.
According to this feature, just by pushing the cylindrical body toward the opening / closing valve portion side of the connecting portion, the contact member provided on the peripheral surface of the tip closely contacts the opening / closing valve portion side with respect to the engaging portion, and the chips enter. Can be easily prevented.

The pipe connecting device of the present invention is
The cylindrical body includes a flange portion that contacts the outer end of the connection portion when the cylindrical body is interposed, and a screw that can be screwed toward the outer end of the connection portion is provided on the flange portion. It is characterized by having.
According to this feature, after the cylindrical body is interposed and the branch port is drilled by a punching machine, the screw provided on the collar portion of the cylindrical body is simply screwed toward the outer end of the connecting portion. The cylindrical body can be removed from the connecting portion using the outer end as a reaction force.

The pipe connecting device of the present invention is
A water stop lid that is an accessory of the drilling machine is attached to the outer end of the connection portion, and a communication path that can communicate with the outside of the connection portion is formed in the water stop lid. .
According to this feature, when the branch port is drilled by the punching machine, the generated chips can be discharged to the outside of the connecting portion through the communication path by opening the communication path formed in the water blocking lid. .

The pipe connecting device of the present invention is
The water stop lid is fixed to a flange member that is externally fitted to the connection portion.
According to this feature, since the water stop lid can be fixed using the flange member fitted on the connection portion, the connection portion does not need to have a structure for fixing the water stop lid in advance, and versatility is enhanced.

The pipe connecting device of the present invention is
The cylindrical body includes a first flange that can be connected to a flange portion of the connection portion, and a second flange that can be connected to a water stop lid that is an accessory of the drilling machine. It is said.
According to this feature, the first flange of the cylindrical body is connected to the flange portion of the connection portion, and the second flange is connected to the water stop lid so that the connection between the connection portion and the water stop lid is a cylinder. This can be done via the body, and a separate interposition member for connecting the connecting portion and the water stop lid can be dispensed with.

The pipe connection device according to the present invention is characterized in that a communication passage that can communicate with the outside of the connection portion is formed in the water stop lid.
According to this feature, when the branch port is drilled by the punching machine, the generated chips can be discharged to the outside of the connecting portion through the communication path by opening the communication path formed in the water blocking lid. .

It is a sectional side view which shows the pipe connection apparatus in Example 1. FIG. It is a sectional side view which shows the state which has pierced the fluid pipe | tube in Example 1. FIG. It is a sectional side view which shows the state which removes the cylindrical body in Example 1. FIG. (A) is a partial sectional side view of the cylindrical body in Example 1, (b) is a rear view similar to (a). It is a sectional side view which shows the state which connected the branch pipe in Example 1. FIG. It is a sectional side view showing the state where the fluid pipe and pipe connecting device in Example 1 moved relatively. (A) is a front view which shows the flange member in Example 1, (b) is a side view like (a). It is a sectional side view which shows the pipe connection apparatus in Example 2. It is a sectional side view which shows the state which has pierced the fluid pipe | tube in Example 2. FIG. It is a partial sectional side view of the cylindrical body in Example 2.

  EMBODIMENT OF THE INVENTION The form for implementing the pipe | tube connection apparatus which concerns on this invention is demonstrated below based on an Example. 1 to 3, 4 (a), 5, 7 (b), and 8 to 10, the illustrated left side is the front (front) side, and the illustrated right side is the rear (back) side. .

  First, the pipe connecting device according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the pipe connection device 10 maintains water tightness on the outer peripheral surface of an existing fluid pipe 1 made of ductile cast iron or the like embedded in the ground, and a predetermined limit with the fluid pipe 1. It is mounted in a state that allows relative movement of the amount. The pipe connection device 10 includes a casing 12 that can be divided into two in the radial direction and a separate covering portion 11. The pipe connection device 10 is not limited to two divisions, and may be divided into a plurality of divisions such as three divisions. In the present embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe 1 is not necessarily limited to clean water, and may be, for example, industrial water, or a gas or gas-liquid mixed state. It may be a fluid pipe through which the fluid flows.

  The housing 12 is formed by integrally forming an opening portion 13, an on-off valve portion 14, and a connecting portion 15 in order from the fluid tube 1 side, facing outward at substantially right angles to the tube axis. Note that at least one of the opening 13, the on-off valve 14, and the connection 15 may be provided separately from the others. The opening portion 13 and the connection portion 15 can communicate with each other by the on-off valve portion 14 and have an inner space structure that extends in the axial direction of the branch port 1 a formed in the fluid pipe 1. The opening part 13 has an opening edge 13a that opens toward the covering part 11, and the opening area of the opening edge 13a is continuous with the opening area on the on-off valve part 14 side. The casing 12 constituting the opening 13, the on-off valve 14, and the connecting portion 15, and the covering portion 11 are connected to each other by bolts and nuts 30 through water-stop members 31 and 32 disposed between the opposing surfaces. The fluid pipes 1 are assembled with each other.

  In this manner, the casing 12 and the covering portion that constitute the opening 13 in a state where the opening edge 13a of the opening 13 and the opening edge of the branch port formed in the fluid pipe 1 as described later are easily aligned. 11 can be connected to the fluid pipe simply by assembling.

  The on-off valve portion 14 can be opened and closed between the opening portion 13 and the connection portion 15 by a valve body 14a that moves up and down by a turning operation of the valve shaft 14b.

  The inner circumferential surface of the connecting portion 15 is more than the annular groove 15a and the annular groove 15a in which the lock ring 22 is installed as the engaging portion of the present invention that engages with the branch pipe 40 connected to the connecting portion 15. An enlarged diameter portion 15b is formed near the outer end 15c of the connecting portion 15 and accommodates the water stop packing 23. In addition, as the engaging portion of the present invention, only the annular groove 15a in which the lock ring 22 is installed may be formed, or only the enlarged diameter portion 15b in which the water stop packing 23 is accommodated may be formed. On the outer peripheral surface of the connecting portion 15, a concave groove 15 e into which the flange member 20 having a divided structure is fitted is formed. Further, in the vicinity of the outer end 15c, adjustment screws 24 are respectively screwed into screw holes 15d that are formed in a plurality in the circumferential direction and extending in the radial direction. Further, an anti-bending ring 35 is provided in advance at the tip of the adjustment screw 24 along the inner peripheral surface of the connecting portion 15 for preventing the bending of the branch pipe described later. Although not particularly shown, the bend preventing ring 35 includes a plurality of arc members adjacent in the circumferential direction and a fixing member interposed between the arc members.

  Next, drilling of the branch port 1a in the fluid pipe 1 using the pipe connecting device 10 will be described.

  As shown in FIGS. 1 and 2, the structure at the time of drilling the branch port 1 a will be described first. A substantially cylindrical tubular body 17 is inserted into the connection portion 15. As shown in FIGS. 4 (a) and 4 (b), the cylindrical body 17 is provided with a close contact member 26 made of an elastic material such as rubber on the front peripheral surface of a body cylinder made of a metal material such as ductile cast iron. Further, a flange portion 17a protruding in the outer diameter direction is formed at the rear end. The above-described main body cylinder of the cylindrical body 17 includes a reduced diameter cylindrical portion 17d on the distal end peripheral surface side and an enlarged diameter cylindrical portion 17e on the flange portion 17a side. It has an outer diameter slightly smaller than that of the tube.

  The cylindrical body 17 fitted in the connecting portion 15 has the contact member 26 abuts on the reduced diameter inner surface 15f of the connecting portion 15 near the on-off valve portion 14 and the flange portion 17a contacts the outer end 15c of the connecting portion 15. By contacting, an annular groove 15a and an enlarged diameter portion 15b as an engaging portion are interposed between a punching machine 16 described later. The cylindrical body 17 is configured so that the axial center of the cylindrical body 17 can be aligned by inserting the adjusting screw 24 as appropriate after being fitted into the connecting portion 15. The cylindrical body 17 is in watertight contact with the water stop packing 23 accommodated in the enlarged diameter portion 15b. As shown in FIG. 1, the cylindrical body 17 includes a lock ring 22, a water-stop packing 23, an adjustment screw 24, and an anti-bending ring 35 that are used for connection to the branch pipe in advance on the inner peripheral surface of the connection portion 15. In this state, it is inserted into the connecting portion 15. Further, according to the cylindrical body 17 having the above-described shape, the inside of the connection portion 15 can be easily fitted by the reduced diameter cylindrical portion 17d, and the enlarged diameter cylindrical portion 17e can be easily brought into watertight contact with the water blocking packing 23.

  Further, a borer head 18 as a water-stopping lid, which is an accessory part of the punching machine 16, is attached to the back side of the flange portion 17 a of the cylindrical body 17. The borer head 18 is fixed to the flange member 20 externally fitted in the concave groove 15e of the connecting portion 15 by a long bolt / nut 25 and presses and holds the packing 27 disposed on the back surface of the flange portion 17a, thereby connecting the connecting portion. 15 is kept watertight. In the borer head 18, the projecting portion 17 c that protrudes rearward on the back surface of the flange portion 17 a is fitted in a central recess 18 b formed on the front surface of the borer head 18, so that the axial center of the drilling machine 16 is aligned. It is attached.

  In detail, as shown in FIGS. 7A and 7B, the flange member 20 is divided into flange members 20a and 20a each having a substantially semicircular arc shape and having insertion holes 20c and 20c, and connection bolts. The flange member 20 includes the nuts 20d and 20d, and the flange member 20 is recessed by fastening the connection bolts and nuts 20d and 20d in a state in which the divided flange members 20a and 20a are fitted along the concave groove 15e of the connection portion 15. Fixedly connected in the groove 15e.

  Thus, since the borer head 18 can be fixed using the flange member 20 externally fitted to the connection part 15, the connection part 15 does not need to have a structure for fixing the borer head 18 in advance, and versatility is improved. .

  The borer head 18 is formed with a communication passage 18a that extends in the outer diameter direction and communicates the inside and outside of the borer head 18, and is further provided with a discharge valve 19 that opens and closes the communication passage 18a.

  Next, as shown in FIG. 2, the step of drilling the branch port 1 a will be described. The valve body 14 a of the on-off valve portion 14 is raised, the discharge valve 19 is opened, and the substantially cylindrical shape constituting the drilling machine 16 is formed. The cutter 21 is sent out to the fluid pipe 1 side to perform perforation. Between this drilling machine 16 and the annular groove 15a and the enlarged diameter part 15b as the engaging part, a cylindrical body 17 that prevents entry of chips into the annular groove 15a and the enlarged diameter part 15b is interposed. As a result, the chips generated from the tube wall along with the fluid flowing out of the fluid pipe 1 circulates inside the cylindrical body 17 without entering the annular groove 15a and the enlarged diameter portion 15b. It can discharge | emit outside the connection part 15 via the communicating path 18a. By this perforation, a substantially circular branch port 1a is formed in a direction orthogonal to the tube axis.

  Further, just by pushing the cylindrical body 17 toward the opening / closing valve portion 14 side of the connecting portion 15, the contact member 26 provided on the peripheral surface of the distal end causes the opening / closing valve to be more than the annular groove 15a as the engaging portion and the enlarged diameter portion 15b. It closely adheres to the reduced-diameter inner surface 15f on the part 14 side and can easily prevent chips from entering. In addition, the cylindrical body does not necessarily need to be equipped with the contact | adherence member 26 in the front-end | tip peripheral surface, and may consist only of a single cylinder member. Furthermore, the cylindrical body is not necessarily limited to the one having water-tightness, and may be formed of a mesh body having such a fineness as to prevent, for example, entry of chips.

  After drilling the branch port 1a, the cutter 21 of the punching machine 16 is pulled back to the connection part 15 side, the valve body 14a of the on-off valve part 14 is lowered, and the borer head 18, the punching machine 16, and further the flange member 20 from the connection part 15. Remove.

  As shown in FIG. 3, just by screwing the screw 28 toward the outer end 15c side of the connecting portion 15 into the female screw hole 17b formed in the flange portion 17a, the outer end 15c is used as a reaction force. Thus, the cylindrical body 17 can be removed from the connecting portion 15.

  As shown in FIG. 5, after removing the cylindrical body 17, the branch pipe 40 having the bulging portion 40 a having the bulging tip in the outer diameter direction is inserted inside the connecting portion 15. The branch pipe 40 inserted into the connecting portion 15 is prevented from being pulled out when the bulging portion 40 a is engaged with the lock ring 22, and the watertightness is maintained because the outer peripheral surface abuts against the water blocking packing 23. . Further, the adjustment pipe 24 is screwed in appropriately, and the bending prevention ring 35 is brought into contact with the outer peripheral surface of the branch pipe 40, thereby preventing the branch pipe 40 from being bent after connection. Next, by raising the valve body 14a again, the fluid pipe 1 and the branch pipe 40 communicate with each other through the branch port 1a.

  In this way, the chips when the perforating machine 16 perforates the branch port 1a by the tubular body 17 interposed between the perforating machine 16 and the annular groove 15a and the enlarged diameter part 15b as the engaging parts. Can be prevented from entering the engaging portion. After the branch port 1a is formed, the annular groove 15a and the enlarged diameter portion 15b are engaged with the branch pipe 40 without causing trouble due to the ingress of chips, and the branch pipe. Can be connected to the connecting portion while maintaining watertightness. Further, in the state in which the cylindrical body 17 is assembled in advance with the lock ring 22, the water stop packing 23, the adjustment screw 24 and the bending prevention ring 35 used for connection with the branch pipe on the inner peripheral surface of the connection portion 15. 15 can be inserted into the branch pipe 40 immediately after removing the cylindrical body 17 without requiring another assembling step.

  Next, the relative movement between the fluid pipe 1 and the pipe connecting device 10 after the perforation of the branch port 1a and the installation of the branch pipe 40 will be described.

  The opening edge 13a of the opening 13 is formed in a substantially circular shape that is sufficiently larger than the opening edge 1b of the branch port 1a. As shown in FIG. 5, immediately after the perforation of the branch port 1a and the installation of the branch pipe 40, the opening edge 13a of the opening 13 is substantially coaxial with the substantially circular opening edge 1b of the branch port 1a and is larger. It is formed in a substantially circular shape with a caliber.

  As shown in FIG. 6, even when the fluid pipe 1 and the pipe connecting device 10 move relative to each other by a predetermined limit amount in the direction around the pipe axis, the opening edge 1 b of the branch port 1 a is the opening edge of the opening portion 13. The open area is maintained without being covered with 13a.

  As described above, the pipe connection device 10 connected to the fluid pipe 1 in a watertight manner has the opening edge 13a of the sufficiently large opening area even if the pipe connection apparatus 10 moves relative to the fluid pipe to a predetermined limit amount due to an unexpected external force or the like. Since the opening region of the branch port 1a of the fluid pipe 1 is maintained by the opening 13, the flow rate from the fluid pipe 1 to the branch pipe 40 connected to the connecting portion 15 through the branch port 1a is always maintained. Will be. Even if the pipe connecting device 10 moves relative to the fluid pipe 1 to a predetermined limit amount, the opening and closing valve 13 is opened and closed by the opening 13 having the open region S between the opening and closing valve portion 14 and opened and closed. A flow path toward the valve portion 14 is secured, and the flow rate to the branch pipe 40 connected to the connecting portion 15 communicating with the valve portion 14 is reliably maintained.

  In addition, although not particularly illustrated, the fluid pipe 1 and the pipe connecting device 10 are not necessarily limited to those that move relative to each other in the direction around the pipe axis of the fluid pipe 1. For example, the fluid pipe 1 and the pipe connecting device 10 are fluids. Even if it moves relative to the pipe axis direction of the pipe 1 or the direction around the pipe axis of the fluid pipe 1 and the pipe axis direction up to a predetermined limit, it has an opening edge 13a of a sufficiently large opening area. The opening region of the branch port 1a of the fluid pipe 1 is maintained by the opened portion 13. As described above, the opening edge 13a of the opening 13 is formed substantially coaxially with the opening edge 1b of the branch port 1a, so that the range of relative movement of the pipe connecting device 10 relative to the fluid pipe 1 can be expanded in multiple directions. it can.

  In addition, the predetermined limit amount of relative movement allowed for the fluid pipe 1 and the pipe connecting device 10 of the present embodiment is a total of approximately 15 degrees positive and negative around the pipe axis of the fluid pipe 1 with reference to the initial connection. It is 30 degrees and the total diameter is approximately the total length of the radial lengths of the front and rear branch ports 1a in the pipe axis direction of the fluid pipe 1. For example, the fluid pipe 1 and the pipe connecting device 10 are relatively moved. It may be connected in a manner that does not allow.

  Next, the pipe connecting device according to the second embodiment will be described with reference to FIGS. In addition, the same structure as the said Example and the overlapping structure are abbreviate | omitted.

  As shown in FIG. 8, on the inner peripheral surface of the connecting portion 15 ′, a lock ring 22 as an engaging portion of the present invention that engages with a branch pipe (not shown) connected to the connecting portion 15 ′. An annular groove 15a in which the water stop member (not shown) is accommodated is formed closer to the outer end 15c of the connecting portion 15 ′ than the annular groove 15a. Outside the outer end 15c of the connecting portion 15 ', a flange portion 15h in which a predetermined number of insertion holes 15j are formed is formed integrally with the connecting portion 15'.

  As shown in FIGS. 8 and 10, a substantially cylindrical tubular body 37 is fitted inside the connecting portion 15 ′. The cylindrical body 37 is provided with an adhesion member 26 made of an elastic material such as rubber on the peripheral surface of the main body made of a metal material such as ductile cast iron. The above-described main body cylinder of the cylindrical body 37 includes a diameter-reduced cylinder part 37d on the tip peripheral surface side and a diameter-enlarged cylinder part 37e on the rear side. Further, the cylindrical body 37 is formed with a first flange 37a projecting in the outer diameter direction on the rear side, and further, a rear end portion spaced apart from the first flange 37a in the axial direction via a cylindrical portion 37f having a predetermined length. And a second flange 37g.

  The first flange 37a is provided with an insertion hole 37b substantially coaxial with the insertion hole 15j of the connecting portion 15 ', and the second flange 37g is a borer as a water stop lid that is an accessory part of the drilling machine 16. An insertion hole formed in the head 18 and a substantially coaxial insertion hole 37h are formed. The cylindrical body 37 is fastened to the connecting portion 15 ′ by a bolt / nut 33 inserted into the insertion hole 15j and the insertion hole 37b, and the bolt / nut 36 inserted into the insertion hole and the insertion hole 37h of the borer head 18. Is fastened to the borer head 18.

  The cylindrical body 37 inserted into the connecting portion 15 ′ is interposed between the annular groove 15 a and the enlarged diameter portion 15 g as the engaging portion and a punching machine 16 described later. The cylindrical body 37 inserted into the connection portion 15 ′ is sealed between the flange portion 15h of the connection portion 15 ′ by the annular packing 39 provided on the front side surface of the first flange 37a. A space between the borer head 18 is sealed by an annular packing 38 provided on the rear side surface of the flange 37g. In addition, instead of or in addition to the annular packing 39, the space between the tubular body 37 and the connecting portion 15 ′ may be sealed by a packing (not shown) provided in the enlarged diameter portion 15g of the connecting portion 15 ′. I do not care.

  The borer head 18 is formed with a communication passage 18a that extends in the outer diameter direction and communicates the inside and outside of the borer head 18, and is further provided with a discharge valve 19 that opens and closes the communication passage 18a.

  Next, as shown in FIG. 9, the step of drilling the branch port 1 a will be described. The valve body 14 a of the on-off valve portion 14 is raised, the discharge valve 19 is opened, and the substantially cylindrical shape constituting the drilling machine 16 is formed. The cutter 21 is sent out to the fluid pipe 1 side to perform perforation. Between this drilling machine 16 and the annular groove 15a and the enlarged diameter part 15g as the engaging part, a cylindrical body 37 that prevents entry of chips into the annular groove 15a and the enlarged diameter part 15g is interposed. As a result, the chips generated from the tube wall along with the fluid flowing out of the fluid pipe 1 circulates inside the cylindrical body 37 without entering the annular groove 15a and the enlarged diameter portion 15g. It can be discharged to the outside of the connecting portion 15 ′ via the communication path 18a. By this perforation, a substantially circular branch port 1a is formed in a direction orthogonal to the tube axis.

  Further, just by pushing the cylindrical body 37 toward the opening / closing valve portion 14 side of the connecting portion 15 ′, the close contact member 26 provided on the peripheral surface of the tip opens and closes the annular groove 15a as the engaging portion and the enlarged diameter portion 15g. Close contact with the reduced diameter inner surface 15f on the valve portion 14 side makes it possible to easily prevent chips from entering.

  In this way, the chips when the perforating machine 16 perforates the branch port 1a by the cylindrical body 37 interposed between the perforating machine 16 and the annular groove 15a as the engaging portion and the enlarged diameter portion 15g. Can be prevented from entering the engaging portion, and after the branch port 1a is drilled, the annular groove 15a and the enlarged diameter portion 15g are engaged with a branch pipe (not shown) without causing trouble due to the ingress of chips. The tube can be connected to the connecting portion 15 ′ while maintaining watertightness. Further, the cylindrical body 37 can be fitted and inserted into the connecting portion 15 ′ in a state where the lock ring 22 used for connection with the branch pipe and the water stop packing are assembled in advance on the inner peripheral surface of the connecting portion 15 ′. After removing the state body 37, the branch pipe can be inserted immediately without requiring a separate assembling step.

  The first flange 37a of the cylindrical body 37 is connected to the flange portion 15c of the connection portion 15 ′, and the second flange 37g is connected to the borer head 18 as a water stop lid, thereby connecting the connection portion 15 ′ and the borer. The connection with the head 18 can be made through the cylindrical body 37, and a separate member for connecting the connecting portion 15 ′ and the borer head 18 can be dispensed with.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the first embodiment, the opening 13 has a sufficiently large opening edge 13a, and the flow rate to the branch pipe 40 via the branch port 1a is maintained even if the fluid pipe 1 and the pipe connecting device 10 move relative to each other. However, for example, the opening edge of the opening may be an opening edge slightly larger than the opening edge of the branch opening of the fluid pipe.

  Further, for example, in the first embodiment, the cylindrical body 17 is provided with the contact member 26 made of an elastic material on the tip peripheral surface of the main body cylinder. For example, the entire cylindrical body is made of an elastic material. It may be a thing. Further, the cylindrical body 17 of the above embodiment is configured to be removed from the connection portion 15 by screwing a screw 28 provided on the flange portion 17a. For example, the cylindrical body is separately provided. It may be removed by a provided unillustrated removing means or the like.

  Further, for example, in the first embodiment, by opening the communication path 18a of the borer head 18 attached to the outer end 15c of the connection portion 15, the chips are discharged to the outside of the connection portion 15 through the communication path 18a. Although the branch port 1a is drilled while being made, for example, a communication path for discharging the chips to the outside may be formed in the cylindrical body, or for temporarily collecting the chips when drilling An accumulation location may be provided separately.

  Further, for example, in the first embodiment, the borer head 18 is fixed to the flange member 20 that is externally fitted to the connection portion 15. For example, a flange portion is integrally provided at the outer end of the connection portion, It may be fixed to the flange portion.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 1a Branching port 1b Opening edge 10 Pipe connection apparatus 11 Covering part 12 Housing | casing 13 Opening part 13a Opening edge 14 On-off valve part 14a Valve body 15, 15 'Connection part 15a Annular groove (engagement part)
15b Diameter expansion part (engagement part)
15c Outer end 15e Groove 15h Flange part 16 Punching machine 17 Cylindrical body 18 Borer head (waterproof lid)
18a Communication path 19 Discharge valve 20 Flange member 21 Cutter 22 Lock ring 23 Water stop packing 26 Water stop member 28 Screw 29 Core 29a Projection port 37 Tubular body 37a First flange 37g Second flange 40 Branch pipe

Claims (7)

A watertight connection can be made between a covering portion for covering a fluid pipe, an opening portion having an opening edge along the opening edge of the branch opening formed in the fluid pipe, and a drilling machine or a branch pipe for making the branch opening. A connection part that is connected to the fluid pipe in a watertight manner, and a connection part that is open to the fluid, and an on-off valve part that can communicate the opening part and the connection part.
An engagement portion that engages with the branch pipe when the branch pipe is connected is provided on the inner peripheral surface of the connection section, and prevents chips from entering the engagement section when the drilling machine is connected. cylindrical body to have, is interposed between said punches and said engaging portion, so that the tip end circumferential face of the cylindrical body, in close contact with the reduced diameter inner surface of said opening and closing valve side of the connecting portion A pipe connecting device characterized in that it is configured . Said tubular body, a tube connecting device according to claim 1, wherein said distal end peripheral surface abuts the opening and closing valve unit side than the engaging portion of the connecting portion, characterized in that it comprises a contact member .   The cylindrical body includes a flange portion that contacts the outer end of the connection portion when the cylindrical body is interposed, and a screw that can be screwed toward the outer end of the connection portion is provided on the flange portion. The pipe connection device according to claim 1, wherein the pipe connection device is provided.   A water stop lid, which is an accessory part of the drilling machine, is attached to the outer end of the connection portion, and a communication path that can communicate with the outside of the connection portion is formed in the water stop lid. The pipe connection device according to any one of claims 1 to 3.   The pipe connection device according to claim 4, wherein the water blocking lid is fixed to a flange member that is externally fitted to the connection portion.   The cylindrical body includes a first flange that can be connected to a flange portion of the connection portion, and a second flange that can be connected to a water stop lid that is an accessory of the drilling machine. The pipe connection device according to claim 1 or 2.   The pipe connection device according to claim 6, wherein a communication path that can communicate with the outside of the connection portion is formed in the water stop lid.

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