JPH0143594Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pipe detachment prevention device with a bridge at a pipe connection.

Conventionally, pipe detachment prevention devices with a piece at the pipe connection part were
For example, in a pipe connection part where a pipe insertion part and a pipe socket part are fitted through packing, a flange fitting connected to the flange part of the pipe socket part by a linking means is fitted to the pipe insertion part. However, since the special wedge piece for storage is only interposed between the flange metal fitting and the pipe insertion part, the wedge piece must be assembled to the flange metal fitting in advance before installation on the pipe insertion part. Therefore, the construction work for the pipe connection part was time-consuming, and the wedge piece was easily lost. Furthermore, even if the wedge pieces are pre-assembled to the flange metal fitting, the structure is complicated and the housing position of the wedge piece is restricted in the circumferential direction of the flange metal fitting, so the number of wedge pieces installed must be increased in proportion to the pipe holding force. It was difficult.

Therefore, the present invention allows the pipe holding wedge piece to be assembled in advance to the flange metal fitting, which facilitates installation on the pipe connection part, and prevents the wedge piece from being lost.
To provide a pipe detachment prevention device at a pipe connection part in which a wedge piece can be easily attached to a flange metal fitting and the number of wedge pieces attached can be easily increased in proportion to the tube holding force.

In other words, the tube detachment prevention device of the present invention uses a flange fitting composed of a plurality of split flanges that can be separated at a tube connection section where a tube insertion section and a tube socket section are fitted together via packing. An annular piece accommodating part is formed on the inner circumferential surface of the flange fitting, which fits into the pipe insertion part and is connected to the flange part of the pipe socket, and has a tapered bottom part. A plurality of wedge pieces are interposed between the outer periphery of the tube insertion part at appropriate intervals in the circumferential direction, and each of the wedge pieces is attached to an elastic holder having a rod-shaped protrusion having a flange protruding from the upper left and right sides. , and the side circumference of the wedge piece including the moving range L of the wedge piece is covered with the holder, and the rod-shaped protrusion of the holder is inserted into the support holes provided through the flange fitting to form a rod-like shape. The flange of the protrusion is engaged with the outer edge of the support hole, the claw provided on the bottom surface of the wedge piece is brought into contact with the outer periphery of the pipe insertion part, and the inclined surface of the wedge piece is fitted into the piece-accommodating part of the flange fitting. It is characterized by a sliding contact.

With this device, the wedge piece can be assembled in advance at a desired position on the flange fitting using the holder, and in this assembly, the rod-shaped protrusion of the holder is used to support the flange fitting. This is easy because the pieces are inserted into the hole and automatically engaged by the elasticity of the flange of the holder. Also, since the piece accommodating part is annular with a tapered bottom, it does not need to be wedged. Since the housing position of the piece is not restricted in the circumferential direction of the piece housing part and the attachment of the holder to the flange metal fitting is done through the support hole of the flange metal fitting, it is possible to increase the number of these support holes and create a wedge. It is easy to increase the number of pieces to be attached in accordance with the tube holding force, and since the piece housing part is annular, it has the same shape all around the circumference, making it easy to manufacture by mechanical processing. Since the side circumference of the wedge piece including the moving range of the wedge piece is covered with a holder, it is possible to prevent earth and sand from flowing into the operating range of the wedge piece, and the operation of the wedge piece can be ensured. Since it is composed of multiple split flanges, it can be retrofitted after the pipe joint is joined, and has good workability. Furthermore, in the utility model registration claim 2, the holder can be easily assembled to the flange fitting by pulling the rod-shaped protrusion with fingers or a bench, and the utility model is In the device described in claim 3, it is possible to use the wedge piece and the holder in common for flange fittings having large and small curvatures corresponding to large and small pipes.

Next, an illustrated embodiment of the present invention will be described. In this example, in a pipe connection section 4, a tube insertion section 3 is inserted into a tube socket section 1 through a packing 2. A two-split flange fitting 6 consisting of a pair of semicircular split flanges 5, 5 is fitted onto the pipe holder, and a key-shaped engaging portion 7 protruding from the outer peripheral edge of the flange fitting 6 at an appropriate interval in the circumferential direction is fitted into the pipe holder. An annular piece accommodating part 10 facing the rear of the flange part 8 of the mouth part 1 and having a tapered bottom part 9 on the inner peripheral surface of the flange metal fitting 6.
A wedge piece 13 is provided with a claw 11 on the front and rear of the bottom surface, and the upper surface is a sloped surface 12 that slopes forward and downward. 12 of the wedge pieces.
along the bottom 9 of the piece storage section, and attach the flange fitting 6.
A projecting portion 14 is provided on the outside of the split end of the pair of split flanges 5, 5, and a bolt 15 is inserted into the opposing projecting portion 14.14 of the split flanges 5, 5.
Screw the nut 16, tighten the split flanges 5, 5, and bite the tip of the claw 11 of the wedge piece into the tube insertion part 11.
The wedge pieces 13 are each held by a holder 17 to be described later,
A holder 17 is attached to the flange fitting 6.

The holder 17 is integrally formed of an elastic material such as rubber or elastic synthetic resin, and is mainly formed along the inclined surface 12 of the upper surface of the wedge piece, as shown in FIGS. 4 and 5. A rod-like protrusion 21 having a cavity 19 in the center of the inclined upper surface 18 and tapered flanges 20 on the left and right sides of the upper surface 18.
is provided protrudingly, and a drawer rod part 2 is further provided at the tip of the collar part 20.
2, and recesses 2 are provided on the left and right inner surfaces of the cavity 19.
3, and a notch 24 for pulling out a claw is provided at the front and rear of the bottom wall of the cavity 19, while the wedge piece 13 mainly has protrusions on the left and right sides as shown in FIGS. 6 and 7. 25, and a recess 26 is provided vertically in the center of the inclined surface 12 in the left-right direction.

In this example, the wedge piece 13 is housed in the hollow part 19 of the holder 17 so that the claw 11 of the wedge piece faces the notch 24, and the rod-shaped protrusion 21 is placed in the bottom part 9 of the piece housing part of the flange fitting 6. The flange portion 20 of the protruding portion is inserted into the support holes 27 that are provided in a large number transparently and engaged with the outer edge of the support hole 27, and the wedge piece is inserted between the front end of the wedge piece 13 and the front end of the piece housing portion 10. A moving range L is provided, and an allowance G is provided between the flange portion 8 of the tube socket portion and the engaging portion 7 when the flange fitting 6 and the pipe socket portion 1 are in contact with each other.

In the device of this embodiment, when the pipe socket part 1 and the pipe insertion part 3 of the pipe connection part try to be pulled out relative to each other due to the internal pressure of the pipe, the engaging part 7 of the flange fitting The inclined surface 12 of the wedge piece 13 which is engaged with the flange part 8 of the socket part, and then the tapered bottom part 9 of the flange fitting 6 is engaged with the pipe insertion part 3 by the claw 11.
Due to the wedge action caused by this slippage, the wedge piece 13 increases the biting force on the pipe insertion port 3 in accordance with the extraction force of the pipe connection part 4, and the extraction of the pipe connection part 4 is prevented. Prevented. At this time, since the holder 17 has elasticity, it bends in response to the sliding movement of the wedge piece 13 and does not inhibit the sliding movement of the wedge piece 13.

In addition, in order to achieve this construction state, first align the protrusion 25 of the wedge piece with the recess 23 of the holder and house the wedge piece 13 in the cavity 17 of the holder, and then insert the holder into which this wedge piece 13 is housed. The rod-shaped protrusion 21 of the fitting 17 is inserted into the support hole 2 of the split flange 5 of the split flange fitting.
7 from the inside as shown by the imaginary line 28 in FIG. The resilient collar 20 is passed through the hole 27 while reducing its diameter, and the wedge piece 13 is placed in the piece accommodating portion 10 of the flange fitting as described above. In this state, the collar 20 is inserted into the hole 27. The holder 17 is held by the flange fitting 6 by engaging with the outer edge of the wedge piece 13.
is held by a holder 17 to maintain a predetermined position relative to the flange fitting 6. Next, the split flange 5 of the flange fitting to which the wedge piece 13 has been assembled is fitted into the pipe insertion part 3 of the pipe connection part 4 using the holder 17, and tightened with the bolts 15 and nuts 16. do.

In addition, in this example, in the construction state, the holder 17
covers the side periphery including the moving range L of the wedge piece 13, so that it prevents earth and sand from flowing into the side periphery of the wedge piece 13, and ensures reliable operation of the wedge piece 13 when the pipe extraction force is applied. I take it as a thing.

In addition, the flange fitting 6 holds the holder 17 through the hole 2.
7, by increasing the number of holes 27 as shown by the imaginary line 29 in FIG.
3 can be easily increased in number. In addition, in this example, since the wedge piece has a recess 26 on the inclined surface 12, the bottom part 9 of the piece accommodating part of the flange fitting that abuts against the inclined surface 12 has curved surfaces C, D, E, the wedge piece 13 and holder 17 can be used in common for pipes of various nominal diameters, and the engagement part 7 of the flange fitting has a margin G with respect to the flange part 8 of the pipe socket part. Therefore, construction can be performed even if the pipe insertion part 3 and the pipe socket part 1 of the pipe connection part are slightly bent due to construction reasons.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is an enlarged sectional view taken along line A-A in FIG. 1, and FIG. 3 is a view taken along B-B in FIG. FIGS. 4 and 5 are an enlarged plan view and right side view of the holder, respectively. FIGS. 6 and 7 are an enlarged front view and right side view of the wedge piece, respectively. It is a diagram. 1... Pipe socket, 2... Packing, 3... Pipe inlet, 4... Pipe connection, 5... Split flange, 6
...Flange metal fitting, 7...Engaging part, 8...Flange part, 9...Bottom part, 10... Piece accommodating part, 11...
...Claw, 12...Slope, 13...Wedge piece, 14...
Overhang, 15...Bolt, 16...Nut, 17
...Holder, 18...Top surface, 19...Cavity part, 2
0... Flange, 21... Rod-like protrusion, 22... Rod, 23... Recess, 24... Notch, 25... Protrusion, 26... Recess, 27... Hole, 28, 29 ……
Virtual line, C, D, E...curved surface, G...margin, L...
...Movement range.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. At a pipe connection part where a pipe inlet part and a pipe socket part are fitted together via packing, a flange fitting composed of a plurality of split flanges that can be divided is An annular piece-accommodating part is formed on the inner circumferential surface of the flange fitting, which fits into the insertion part and is linked to the flange part of the pipe socket, and has a tapered bottom part, and the piece-accommodating part and the pipe are connected to each other. A plurality of wedge pieces are interposed at appropriate intervals in the circumferential direction between the outer periphery of the insertion opening, and the wedge pieces are attached to elastic holders that have rod-shaped protrusions with flanges projecting from the left and right upper parts. The side periphery of the wedge piece that is held and includes the moving range L of the wedge piece is covered with the holder, and the rod-shaped protrusion of the holder is inserted into a number of supporting holes provided through the flange metal fitting to make the rod-shaped protrusion. The flange of the wedge piece is engaged with the outer edge of the support hole, the claw provided on the bottom surface of the wedge piece is brought into contact with the outer periphery of the pipe insertion part, and the inclined surface of the wedge piece is slid into the piece housing part of the flange fitting. A device for preventing pipe separation at a pipe connection portion, characterized in that the pipes are in contact with each other. 2. A pipe detachment prevention device in a pipe connection section according to claim 1, wherein the flange of the rod-shaped protrusion is provided with a drawer rod at the tip. 3. A pipe detachment prevention device in a pipe connection section according to claim 1, wherein the wedge piece has a concave portion formed in the middle of the upper surface in the left-right direction.