JP6002990B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint, and more particularly to a pipe joint suitable as a joint for a water pipe such as a steel pipe used for a well for taking ground water or a steel pipe for collecting water.

  As a method of connecting a plurality of pipes used as a water supply steel pipe or the like, there is a method of welding and connecting adjacent end portions of two pipes to be connected as the simplest method. However, the welding method can connect pipes straight when welding at the factory, but it is difficult to connect straightly at construction sites such as catchment burials and tends to vary, resulting in poor finish accuracy. There are difficulties.

  There is also a method of connecting both pipes by providing a screw at one end of two pipes to be connected, a female thread at the other end, and screwing one end into the other end. However, this method can be used to connect sideways tubes when the tube diameter is small, but when the tube diameter is large, it becomes difficult to rotate and screw the tube many times manually. There is a drawback that it takes.

  In addition, a flange having a plurality of bolt holes in the circumferential direction is attached to the connection ends of the two pipes to be connected, and the flanges of the pipes to be connected are combined and connected by fastening bolts to the bolt holes with nuts. There is a way. This flange is smooth by grinding the joint surface by machining, so the sealing performance when connecting the pipes is good, but the flange is expensive, the construction cost increases, and the pipe is placed horizontally and connected In some cases, it is extremely difficult to insert a bolt into the bolt hole on the lower side of the flange and fasten the bolt.

  The present invention has been considered in view of the above-mentioned problems of conventional pipe joints that interconnect a plurality of pipes used as water pipes for water supply in groundwater intake wells, catchment burials, etc. It is an object of the present invention to provide a novel pipe joint having improved workability while having a necessary and sufficient function as a pipe joint such as a steel pipe.

  As a result of intensive studies and experiments in order to achieve the above object of the present invention, the present inventor has paid attention to the fact that water tightness is not particularly required in the joint portion when connecting a pipe used as a water feeding steel pipe or the like. The present inventors have found that it is possible to provide a pipe joint that can exhibit a necessary and sufficient function as a pipe joint while having a simple structure.

That is, in order to solve the above-described problems of the present invention, in the first configuration of the present invention, the pipes are fitted and fixed to at least a part of the outer peripheral surface of each connection end of the two pipes to be connected. A pair of flange fixing bands and one or more connection holes for fastening members insertion that are extended in parallel with the pipe axis and are fixed to the outside of the flange fixing band at two locations facing the pipe in the radial direction. comprises of a plate-like flange, and the flange fixing band has its tube axis direction outer portion is secured to the tube so as to protrude by a predetermined distance from the edge of the tube, said flange, said flange fixing One of a pair of two pipes to be connected, formed by bending both ends of the band for bending outward in the radial direction of the pipe, or by attaching plate-like flange parts to both ends of the flange fixing band A plate-like hooking claw extending in the radial direction of the pipe is fixed to the inner end edge in the pipe axial direction of the flange on one side of the flange, and the one side of the pair of flanges of the other pipe A pipe joint is provided in which a plate-like hooking claw extending in the radial direction of the pipe is fixed to the outer end edge in the pipe axial direction of the flange on the opposite side .

In the second configuration of the present invention, a flange fixing band formed in a short cylindrical shape that is fitted over the entire outer peripheral surface of each connection end of the two pipes to be connected, and in parallel with the pipe axis And a pair of plate-like flanges that are fixed to the outside of the flange fixing band at two locations facing the radial direction of the pipe and that have one or more connection holes for inserting fastening members, The flange fixing band of one of the two pipes to be connected is fixed to the pipe in a state where the outer portion in the pipe axial direction is retracted from the end edge of the pipe by a predetermined distance toward the inside. The other flange fixing band of the pipe is fixed to the pipe in a state where an outer portion in the pipe axial direction protrudes a predetermined distance from the edge of the pipe, and the pipe axial direction of the pair of flanges of the other pipe Each outer edge has a plate shape that extends in the radial direction of the tube. Pipe fitting latching pawls is fixed is provided.

In the third configuration of the present invention, in addition to the second configuration, the one flange fixing band further includes a pair of flanges having the same configuration as the flange in the middle of the pair of flanges in the pipe circumferential direction. And the other flange fixing band is provided with a pipe joint in which a pair of flanges having the same configuration as that of the flange is further fixed in the middle of the pipe circumferential direction of the pair of flanges. .

According to the first configuration of the present invention, the pipe joint is fitted to and fixed to at least a part of the outer peripheral surface of each connection end of the two pipes to be connected, and the pipe A pair of plate-like flanges that extend in parallel with the shaft and are fixed to the outside of the flange fixing band at two locations facing the radial direction of the pipe and having one or more connection holes for inserting fastening members The flange fixing band is fixed to the pipe in a state where an outer portion in the pipe axial direction protrudes from the end edge of the pipe by a predetermined distance, and the flange attaches both ends of the flange fixing band to the pipe. It is formed by bending outward in the radial direction, or formed by attaching plate-like flange parts to both ends of the flange fixing band, and is connected to one side of one pair of flanges of two pipes to be connected. Flange pipe A plate-like hooking claw extending in the radial direction of the pipe is fixed to the inner edge in the direction of the pipe, and the outer edge in the pipe axis direction of the flange opposite to the one side of the pair of flanges of the other pipe Since a plate-like hooking claw that extends in the radial direction of the pipe is fixed , the flange of one pipe to be connected and the flange of the other pipe are overlapped with each other, and a bolt is inserted into the connection hole with a nut. Two pipes can be easily connected by a simple operation of fastening. Therefore, it is possible to connect the pipes straightly by a simple and short-time operation as compared with the pipe connecting method by the conventional welding work. Further, even when the pipe diameter is larger than that of a conventional screw-in type pipe joint, there is no work of rotating the pipe many times, so that the work is facilitated and the workability is improved. In addition, the manufacturing cost is significantly lower than conventional flange-type pipe fittings that require the fastening operation over the entire circumference of the flange by grinding the joint surface of the flange, and the construction is much easier without the difficulty in fastening work under the flange. It is.
The flange is formed by bending both ends of the flange fixing band outward in the radial direction of the pipe, and the flange fixing band is in a state where the outer portion in the pipe axial direction protrudes from the end edge of the pipe by a predetermined distance. Since it is fixed to the pipe, a pair of flanges can be formed simply by bending both ends of the flange fixing band, and the manufacturing is easy and the manufacturing cost is low. In addition, the flange fixing band is fixed to the pipe with its outer portion in the pipe axial direction protruding a predetermined distance from the end edge of the pipe, so when connecting two pipes, the two pipes are adjacent to each other. By joining the edges together, the flange of one tube and the flange of the other tube can be overlapped, making the operation easier.
In addition, a plate-like hooking claw extending in the radial direction of the pipe is fixed to the inner end edge in the pipe axial direction of the flange on one side of the pair of flanges of one of the two pipes to be connected. A plate-like hooking claw extending in the radial direction of the pipe is fixed to the outer end edge in the pipe axial direction of the flange on the opposite side to the one side of the pair of flanges of the other pipe. When the upper and lower pipes are connected vertically, the upper pipe is suspended at the position where the upper pipe flange and the lower pipe flange are spaced apart from each other until the lower edge of the upper pipe is aligned with the upper edge of the lower pipe. By moving the upper pipe and overlapping the flanges of both pipes, the flanges of both pipes are mutually regulated by the two hooking claws, and there is no possibility that the flanges will overlap with each other. Work easily and stably It is possible.

According to the 2nd structure of this invention, the band for flange fixation formed in the short cylinder shape fitted over the whole outer peripheral surface of each connection end part of two pipes connected, and a pipe axis is parallel. And a pair of plate-like flanges that are fixed to the outside of the flange fixing band at two locations facing the radial direction of the pipe and that have one or more connection holes for inserting fastening members. , one flange fixing band of two pipes to be connected is fixed to the tube while the tube axially outer portion thereof is retracted by a predetermined distance inwardly from the end edge of the tube, two of which are connected The other flange fixing band of the pipe is fixed to the pipe in a state where an outer portion in the pipe axial direction protrudes from the end edge of the pipe by a predetermined distance, and the outer side in the pipe axial direction of the pair of flanges of the other pipe. A plate-like hook that extends in the radial direction of the pipe at each end edge When connecting a plurality of pipes in the vertical direction, the one pipe is set as the upper pipe and the other pipe is set as the lower pipe, and the flange of the upper pipe and the lower pipe are arranged. At the position where the flanges of the pipes are separated from each other, suspend the upper pipe until the lower edge of the flange fixing band is aligned with the upper edge of the lower flange fixing band of the pipe, and then rotate the upper pipe to rotate both By overlapping the flanges of the pipes, the flanges of both pipes are mutually regulated by the two hooking claws, and there is no possibility that the flanges will overlap, making it easy and stable to fasten the flanges. Can be done.

According to a third aspect of the present invention, in addition to the second configuration, a pair of further said flange having the same configuration in circumferential direction of the tube of the pair of flange intermediate the one flange fixing band the flange is fixed, since a pair of flanges further said flange having the same configuration in the pipe circumferential direction intermediate a pair of flanges to the other flange fixing band is fixed, the joint total 4 Two pipes are connected by a pair of flanges, and the connection is further strengthened, which is effective when a large number of pipes or large-diameter pipes are suspended.

It is a perspective view showing one basic embodiment of the pipe joint of the present invention. It is a perspective view which shows the example of a change of embodiment shown in FIG. It is a perspective view showing an embodiment of a pipe joint suitable for connecting a pipe suspended in the up-and-down direction. It is a perspective view which shows other embodiment of a suitable pipe joint in order to connect the pipe | tube hung up and down. It is a perspective view which shows the example of a change of embodiment shown in FIG. It is a perspective view which shows one Embodiment of a flexible pipe coupling, and is a figure which shows the manufacturing process. It is sectional drawing which shows the detail of the band for flange fixation of the flexible pipe joint shown in FIG. 6, and the tack welding part of a pipe | tube. It is a perspective view which shows the connection method of the flexible pipe joint in a construction site. It is explanatory drawing for demonstrating typically the function of the flexible pipe joint in the normal connection state at the time of pipe | laying installation. It is explanatory drawing for demonstrating typically the function of a flexible pipe joint when it enters into a flexible connection state by ground fluctuation.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a basic embodiment of the pipe joint of the present invention, (a) is a view showing a state before connecting the joint, and (b) is a view showing a state where the joint is connected. is there.

This embodiment is a preferred embodiment when used to connect while transversely a plurality of tubes in construction sites, such as culverts buried catchment.

  Although this embodiment and each embodiment described thereafter are described as pipe joints that connect screen pipes, the pipes to be connected are not limited to screen pipes, and are ordinary cylindrical steel pipes or resin pipes. Also good. In addition, the pipe joint used in this embodiment and each of the embodiments described later is described as a steel joint, but the joint is not limited to steel but may be a metal or resin joint such as an alloy iron. May be.

  The pipe joint 1 is composed of two joint parts 2, 2, each joint part 2, 2 being slightly smaller than the outer diameter of each connection end 4, 4 of the two cylindrical pipes 3, 3 to be connected. The flange fixing bands 5 and 5 having a shape in which a short cylinder having a large inner diameter is divided into two in the radial direction, and the pipes 3 and 3 are extended in parallel with the pipe axis, and are opposed to the pipes 3 and 3 in two radial directions. A pair of plate-like flanges 6 and 6 which are fixed to the outside of the flange fixing bands 5 and 5 and which are long in the tube axis direction are provided. These flanges 6, 6 are formed by bending both ends of the flange fixing bands 5, 5 outward in the radial direction of the tubes 3, 3, or by a welding structure. Each flange 6 is provided with one connection hole 7 for inserting a fastening member at the center thereof.

  The flange fixing band 5 of the pipe 3 on the front side in the middle of FIG. 1 (a) of the two pipes 3 and 3 to be connected is in a state where the outer portion in the pipe axis direction protrudes from the end edge of the pipe 3 by a predetermined distance. The pipe 3 flange fixing band 5 on the back side in FIG. 1A is welded to the upper outer peripheral surface of the connection end 4 of the pipe 3, and the pipe axially outer portion thereof extends from the edge of the pipe 3. The tube 3 is fitted and welded to the lower outer peripheral surface of the connection end 4 of the tube 3 in a state protruding by a predetermined distance. When the flange fixing band 5 is made of resin, it may be bonded to the connection end 4 using an adhesive.

  The pipe joint 1 of the present embodiment is in the state shown in FIG. 1A at the time of manufacture and shipment at the factory. When connecting pipes at construction sites such as water collecting burieds, FIG. As shown in FIG. 3, the flanges 6 and 6 of the joint portion 2 on the near side are overlapped with the flanges 6 and 6 of the joint portion 2 on the back side, thereby connecting the connection holes 7 and 7 of the flange on the near side and the flange on the back side. The connection of the pipes 3 and 3 by the pipe joint 1 is completed by aligning the 6 and 6 connection holes 7 and 7 and inserting bolts into the upper and lower connection holes 7 and 7 in the direction indicated by the arrows and fastening with the nuts. To do.

  FIG. 2 is an embodiment showing a modification of the embodiment of FIG. 2 and the following embodiments, members or parts having the same functions as those in the embodiment of FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and detailed descriptions thereof are omitted.

FIG. 2A is a diagram showing a state before connecting the joint, and FIG. 2B is a diagram showing a state where the joint is connected. This embodiment differs from the embodiment of FIG. 1 in that there is one connection hole 7 for inserting a fastening member in the embodiment of FIG. 1, whereas in the embodiment of FIG. Is two in the longitudinal direction of one flange. This strengthens the fastening of the flange and strengthens the connection of the pipe joint. Note that the number of connection holes is not limited to two and may be three or more.

FIG. 3 shows another embodiment of the pipe joint of the present invention, which is a preferred embodiment for connecting pipes suspended in the vertical direction . FIG. 3A is a view showing a state before connecting the joint, and FIG. 3B is a view showing a state where the joint is connected.

  In this embodiment, the flange 6 on one side (the front side in the figure) of the pair of flanges 6 and 6 of the pipes 3 in the upper middle of the two pipes 3 and 3 connected in FIG. A plate-like hooking claw 8 extending in the radial direction of the pipe is fixed to the inner edge in the pipe axis direction of the pipe, and is opposite to the one side of the pair of flanges 6 and 6 of the lower pipe 3 ( A plate-like hooking claw 8 extending in the radial direction of the pipe is fixed to the outer end edge in the pipe axis direction of the flange 6 on the rear side in the drawing.

  According to this embodiment, when connecting a plurality of tubes in the vertical direction, the axis of the upper tube 3 and the axis of the lower tube are separated from each other, and the flange 6 of the upper tube 3 and the lower In a position where the flanges 6 of the pipe 3 are separated from each other (displaced positions), the upper pipe 3 is suspended until its lower end edge is aligned with the upper end edge of the lower pipe 3, and then the upper pipe 3 is moved laterally in the figure. The flanges 6 and 6 of both the pipes 3 and 3 are overlapped with each other by moving in the direction of the arrow, so that the flanges 6 and 6 of both pipes are mutually regulated by the two hooking claws 8 and 8. There is no possibility that the flanges 6 and 6 are overlapped with each other, and the fastening operation of the flanges can be performed easily and stably.

FIG. 4 shows another embodiment of the pipe joint of the present invention, which is a preferred embodiment for connecting pipes suspended in the vertical direction . FIG. 4A is a diagram showing a state before connecting the joint, and FIG. 4B is a diagram showing a state where the joint is connected.

  In this embodiment, the flange fixing band 5 is a short cylindrical member that is fitted and welded over the entire outer peripheral surface of the connection end 4 of the pipe 3, and the pipe 3 above the two pipes to be connected. The flange fixing band 5 is fixed to the pipe 3 in a state where the outer portion in the pipe axial direction is retracted from the lower end edge of the pipe inward by a predetermined distance, and the flange of the pipe 3 below the two pipes to be connected. The fixing band 5 is fixed to the tube 3 in a state where an outer portion in the tube axis direction protrudes from the upper end edge of the tube by a predetermined distance. The pair of flanges 6 and 6 of each pipe is formed by welding and fixing a member different from the flange fixing band 5 to the flange fixing band 5, and the pair of flanges 6 and 6 of the lower pipe 3. The plate-like hooking claws 8, 8 extending in the radial direction of the pipe 3 are fixed to the outer edges of the pipe axis direction.

  According to the embodiment of FIG. 4, when connecting a plurality of pipes in the vertical direction, the upper pipe is located at a position where the flanges 6, 6 of the upper pipe 3 and the flanges 6, 6 of the lower pipe are separated from each other. 3 is suspended until the lower end edge of the flange fixing band 5 is aligned with the upper end edge of the flange fixing band 5 of the lower pipe 3, and then the upper pipe 3 is rotated counterclockwise in FIG. 4 (a). By overlapping the flanges 6 and 6 of both pipes, the flanges 6 and 6 of both pipes are supported by the two hooking claws 8 and 8, and there is no possibility that the flanges overlap. The fastening operation of the flange can be performed easily and stably.

FIG. 5 shows another embodiment of the pipe joint of the present invention, which is a preferred embodiment for connecting pipes suspended in the vertical direction as in the embodiment of FIG . (A) of FIG. 5 is a diagram showing a state before connecting the joint, (b) is a diagram showing a state of connecting the joints.

  In this embodiment, the flange fixing band 5 of the upper pipe 3 has a pair of flanges 6 and a pair of additional flanges 6-2 having the same configuration as that of the flange in the middle of the pipe circumferential direction. 6-2 is fixed by welding, and a pair of flanges 6-2, 6-6 having the same configuration as that of the flanges 6, 6 are arranged in the middle of the pipe circumferential direction of the pair of flanges 6, 6 in the lower flange fixing band 5. 2 is fixed by welding. The other structure is the same as the embodiment of FIG.

  According to this embodiment, this joint connects two pipes by a total of four pairs of flanges, and the connection is further strengthened, which is effective when hanging a large number of pipes or pipes having a large diameter and heavy weight. It is.

6-10 is a figure which shows other embodiment of the pipe joint of this invention. This embodiment is a preferred embodiment when used to connect while transversely a plurality of tubes in construction sites, such as culverts buried catchment.

  FIG. 6 is a view showing the manufacturing process of the joint, FIG. 7 is a sectional view showing details of the flange fixing band of the flexible pipe joint and the tack welded portion of the pipe, and FIG. 8 is a flexible view at the construction site. FIG. 9 is a diagram illustrating a connection method of pipe joints, FIG. 9 is an explanatory diagram for schematically explaining the function of the flexible pipe joint in a normal connection state at the beginning of pipe laying, and FIG. It is explanatory drawing for demonstrating typically the function of a flexible pipe joint when it enters into a connection state.

  In this embodiment, two pipes 3 arranged side by side with a predetermined interval (d in FIG. 7) between the adjacent ends 4 and 4 of the two pipes 3 and 3 to be connected, As shown in an enlarged view in FIG. 7, ring-shaped tip projections 9 are formed on the outer peripheral surface of the tip of each connection end 4 of FIG. On the outer peripheral surface on the inner side in the tube axis direction, a ring-shaped inner protrusion 10 is formed so as to protrude radially outward from the tip protrusion 9 at a predetermined interval (f in FIG. 7). The tip protrusion 9 has a higher protrusion height radially outward than the inner protrusion 10, and the protrusion has a larger width in the tube axis direction.

  The flange fixing band 6 of each bearing portion 2 has a shape in which a cylinder is divided into two in the radial direction, and projecting portions projecting so as to extend inward in the radial direction of the cylinder at both ends of the outer peripheral surface in the axial direction 5a is formed. One of the projections 5a of the flange fixing band 5 is temporarily welded to a predetermined portion 11 between the tip projection 9 and the inner projection 10 of the tube 3, and the other of the projections 5a is the connection end of the tube. 4 protrudes. In this tack welding, as shown in FIG. 7, when the joint is in a flexible state, the end edges of the protrusions 5a are arranged on the outer surface of the pipe 3 so that the pipes 3 and 3 can move as much as possible in the space inside the joint. Are welded in a state of being lifted by a predetermined dimension. At both ends in the circumferential direction of the flange fixing band 5, plate-like flanges 6, 6 extending in parallel with the axial direction and fixed to the outside of the flange fixing band 5 are provided. The flanges 6 and 6 are formed by bending the outer end of the flange fixing band 5 outward in the radial direction of the pipe. Each of the flanges 6 and 6 has two connection holes 7 and 7 for inserting fastening members.

  This flexible joint is tack welded to the upper side of one pipe 3 to which the joint part 2 shown on the left side in FIG. 6A is connected, and the lower part to which the joint part 2 shown on the right side in FIG. 6B is connected. It is tack welded to the lower side of the tube 3 and is shipped from the factory as shown in FIG. Then, as shown in FIG. 8 (a), the flanges 6 and 6 of the left joint portion 2 and the flanges 6 and 6 of the right joint portion 2 are vertically overlapped as shown in FIG. ), Bolts are inserted into the connection holes 7 and 7 in the direction of the arrow and fastened with nuts to complete the connection of the tubes 3 and 3.

  In the normal connection state at the beginning of laying of the pipe, the pipe joint is in a state in which one protrusion 5a of the flange fixing band 5 is temporarily welded to the outer peripheral surface of the pipe 3 as shown in FIG. 3 is fixed in the space formed by the flange fixing bands 5 and 5 of the pipe joint 3 with a predetermined distance d (FIG. 7) between them, but is connected by ground fluctuation such as an earthquake. When the two pipes 3 and 3 that are present cannot maintain a straight state and are bent to each other, as shown in FIG. The two pipes that are broken and connected to each other at a distance are connected to each other in the inner space of a pair of flange fixing bands that are fastened and fixed to each other by flanges, and the tip projections 9 of each pipe. Constant between the inner protrusion 10 and the inner protrusion 10 It is possible to move freely in a range and flexible within an angle. Therefore, this pipe joint can function as a flexible joint without causing breakage or damage to either the pipe 3 or the pipe joint 1 even when ground fluctuation occurs.

1 Pipe Fitting 2 Joint Part 3 Pipe 4 Connection End 5 Flange Fixing Band 6 Flange 7 Connection Hole 8 Hook Claw 9 Tip Projection 10 Inner Projection

Claims (3)

A flange fixing band that is fitted and fixed to at least a part of the outer peripheral surface of each connection end of the two pipes to be connected, and extends in parallel with the pipe axis, and faces 2 in the radial direction of the pipe. and a pair of plate-like flange 1 or more connecting holes for fixed fastening member inserted into the outer was established in the flange fixing band at the point,
The flange fixing band is fixed to the pipe in a state where the outer portion in the pipe axial direction protrudes from the end edge of the pipe by a predetermined distance,
The flange is formed by bending both ends of the flange fixing band outward in the radial direction of the pipe, or by attaching plate-like flange parts to both ends of the flange fixing band,
A plate-like hooking claw extending in the radial direction of the pipe is fixed to the inner end edge in the pipe axial direction of the flange on one side of the pair of flanges of one of the two pipes to be connected. A pipe-shaped hooking claw extending in the radial direction of the pipe is fixed to the outer end edge in the pipe axial direction of the flange on the opposite side to the one side of the pair of flanges of the pipe. . A flange fixing band formed in a short cylindrical shape that is fitted over the entire outer peripheral surface of each connection end of the two pipes to be connected, and extends in parallel with the pipe axis and faces the pipe in the radial direction. A pair of plate-like flanges fixed at the outside of the flange fixing band at two locations and having one or more connection holes for inserting fastening members;
The flange fixing band of one of the two pipes to be connected is fixed to the pipe in a state where the outer portion in the pipe axial direction is retracted from the end edge of the pipe by a predetermined distance toward the inside. The other flange fixing band of the pipe is fixed to the pipe in a state where an outer portion in the pipe axial direction protrudes a predetermined distance from the edge of the pipe, and the pipe axial direction of the pair of flanges of the other pipe pipe joint characterized in that the plate-like latching pawls on the outer edges extending in a radial direction of the respective tube is fixed. A pair of flanges having the same configuration as that of the flange is further fixed to the flange fixing band in the middle of the pipe circumferential direction of the pair of flanges. 3. The pipe joint according to claim 2, wherein a pair of flanges having the same configuration as that of the flange is further fixed at an intermediate position in the pipe circumferential direction of the pair of flanges.

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