JP4659558B2 - Curved pipe and pipe branching structure using the same - Google Patents

Description

  The present invention relates to a main pipe embedded mainly in a common groove or the like, and relates to a bent pipe used for avoiding an obstacle or the like, and a pipe branching structure using the bent pipe.

  Conventionally, it is known to use a bent pipe 20 as shown in FIG. 4 when performing a bent pipe for avoiding an obstacle.

  The bent tube 20 has a connection opening 21 having a large inner diameter at one end, and an insertion opening 22 having an outer diameter that is the same inner diameter as the intermediate portion and can be inserted and connected into the connection opening 21 at the other end. A tube body 23 is provided.

  And this pipe | tube main body 23 is curving by the predetermined | prescribed magnitude | size of curvature radius R1 (for example, 5m, 10m etc.) between the connection opening part 21 and the insertion opening part 22. FIG.

  On the other hand, in order to branch the pipe from the bent pipe 20 provided with the curved pipe body 23 in this way, a branch pipe joint (not shown) in which a saddle portion attached to the pipe body 23 is formed by a flexible member. ) Is known (see, for example, Patent Document 1).

In order to attach such a branch pipe joint, a branch through hole (not shown) is first formed in the pipe body 23. Next, the saddle portion is bent so as to be in a watertight state with the peripheral edge portion of the branch through hole, and the saddle portion is bent and fixed to the pipe body 23.
JP 2005-192329 A

  By the way, forming a branch through-hole in the curved pipe body 23 has many problems in construction, and it has been very difficult to carry out realistically.

  In particular, when the tube main body 23 is a protective tube for a communication cable or the like, the cable inserted into the tube main body 23 may be biased. Therefore, when the branch through hole is formed after the cable is inserted, it is very difficult to open the hole without damaging the cable inside the tube main body 23, and it is almost impossible to realize it.

  Therefore, in reality, a branch through-hole cannot be formed unless it is a straight so-called straight pipe, and there has been a problem that the pipe cannot be easily branched from the bent pipe 20.

  Furthermore, since the pipe cannot be easily branched from the bent pipe 20, it may be necessary to attach a branch pipe joint at a position away from the part to be originally branched and to perform a long-distance drawing work or the like.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bent pipe capable of branching a pipe by easily forming a branch through hole at the same time as a bent pipe, and a pipe branch structure using the bent pipe.

In order to solve the above-mentioned problem, a bent tube according to the invention described in claim 1 is a bent tube through which a communication cable is inserted, a curved portion formed in an intermediate portion, and a straight portion continuous from the curved portion. , have a, includes a tube body to 1000mm effective length, the straight portion sets a branch through hole connecting at least the branch pipe joint formable length to the tube body, from the curved portion The angle between the central axis passing through one end of the bending portion and the central axis passing through the other end of the bending portion is an obtuse angle, so that the branch in the state where the communication cable is inserted It is characterized in that a through hole can be formed.

  According to a second aspect of the present invention, in the bent pipe according to the first aspect, the curved portion is located near one end of the tube main body, and the straight portion continues to the other end of the tube main body. It is characterized by that.

  According to a third aspect of the present invention, in the bent pipe according to the first or second aspect, the pipe body has a connection opening having a large inner diameter at one end and the same inner diameter as the intermediate part at the other end. And an insertion opening having an outer diameter that can be inserted and connected into the connection opening.

  A pipe branching structure according to the invention described in claim 4 comprises the bent pipe according to any one of claims 1 to 3 and a branch pipe joint attached to the bent pipe. A branch through hole is formed in the straight part, and the branch pipe joint has a saddle part attached to a peripheral part of the branch through hole and a branch pipe part extending from the saddle part. It is a feature.

  According to the invention of claim 1 of the present application, since the pipe main body having the straight portion continuous from the curved portion is provided, the branch through hole can be easily formed in the straight portion, and the pipe line is connected to the straight portion. Can be branched.

  Even when the communication cable is inserted into the tube main body, the internal communication cable is not easily biased in the straight portion, and the branch through hole can be easily formed.

  On the other hand, since the pipe body has a curved portion, it is possible to perform bending piping in a desired direction by combining a plurality of pipe bodies.

  In this way, bent piping can be performed, and at the same time, a branch through hole can be easily formed to branch the pipeline.

  According to the invention of claim 2 of the present application, in addition to the effect of claim 1, since the curved portion is located in the vicinity of one end of the tube body, a long straight portion is secured even if the effective length of the tube body is relatively short. can do.

  According to the invention of claim 3 of the present application, in addition to the effect of claim 1 or 2, the pipe body has the connection opening at one end and the insertion opening at the other end. By inserting and connecting the insertion opening of the bent pipe adjacent to the opening, the plurality of pipe bodies can be reliably and easily connected. Thereby, bending piping to a desired direction can be performed easily.

  According to the invention of claim 4 of the present application, since the pipe can be branched using the bent pipe according to any one of claims 1 to 3, the pipe is bent in a desired direction, and at the same time, It is possible to branch the pipeline even while the pipeline is bent.

  Thereby, efficient piping can be performed and it becomes possible to aim at cost reduction.

  Next, a bent pipe and a pipe branching structure using the same according to the best mode for carrying out the present invention will be described with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes a bent pipe according to the present invention, which includes a pipe body 2 into which a communication cable (not shown) such as an optical fiber embedded in the ground is inserted.

  The tube body 2 is mainly made of a hard vinyl chloride resin material, and has a curved portion 3 formed at an intermediate portion and a linear straight portion 4 continuous from the curved portion 3. . The effective length L is 1000 mm (1 m) so that it can be easily replaced with a conventional bent pipe in construction.

  The “effective length” is a length of a portion where an adjacent bent tube is not inserted inside when a plurality of bent tubes 1 are connected.

  Here, the bending portion 3 is formed by bending the central axis O of the tube body 2 with a curvature radius R of 450 mm. The length L1 of the curved portion 3 is 230 mm here.

  The radius of curvature R and the length L1 of the curved portion 3 are used to form the effective length L of the bent tube 1, the length L2 of the straight portion 4, the length L3 of the connection opening 5 described later, and the connection opening 5. It is determined in consideration of the required dimensions, the deflection angle of the connection opening 5 with the conventional bent pipe, and the like.

  The curvature radius R and the length L2 of the bending portion 3 are determined so as to correspond to a conventional bent pipe having an effective length of 1 m and a curvature radius of 5 m.

  Further, the curved portion 3 is continuous from the connection opening 5 formed at one end of the tube main body 2 and is located in the vicinity of the connection opening 5.

  The straight line portion 4 continues from the bending portion 3 to an insertion opening 6 described later formed at the other end of the tube body 2. The straight line portion 4 only needs to have a length at which at least a branch through-hole 7 to be described later can be formed. Here, the length L2 is 770 mm. The length L2 of the straight portion 4 is preferably 500 mm or more in consideration of the opening operation of the branch through hole 7.

  A branch through hole 7 is formed in the straight portion 4. The branch through hole 7 has a substantially elliptical shape in plan view, and has a size capable of drawing (drawing) a communication cable (not shown) inserted into the tube main body 2.

  The connection opening 5 is formed so that the inner diameter is slightly larger than the outer diameter of the insertion opening 6 formed at the other end, and an annular convex groove 5 a is provided in the vicinity of the opening of the tube body 2. ing. A rubber packing B is fitted in the convex groove 5a.

  The length L3 of the connection opening 5 is determined in consideration of the length for inserting the insertion opening 6 and the contraction length during an earthquake.

  The insertion opening 6 is formed to have the same inner diameter as that of the intermediate part of the tube main body 2 and an outer diameter that can be inserted and connected into the connection opening 5. It is tapered.

  Here, “insertion connection” means that the insertion opening 6 of one bent pipe 1 is inserted into the connection opening 5 of another adjacent bent pipe 1 as shown in FIG. In other words, the outer surface and the inner surface of the connection opening 5 are brought into close contact with each other in a substantially watertight state, and the adjacent bent tubes 1 are connected to each other.

  The branch pipe joint 10 is mainly made of a hard vinyl chloride resin material, and includes a saddle portion 11 attached to a peripheral portion of the branch through hole 7 and a branch pipe portion 12 extending from the saddle portion 11. Have.

  The saddle portion 11 is a plate body having a semicircular arc-shaped cross section that is substantially the same as the outer peripheral surface shape of the straight portion 4 of the tube body 2, and an insertion hole 11 a is formed at substantially the center.

  The branch pipe part 12 is integrated with the peripheral part of the insertion hole 11 a formed in the saddle part 11, and extends in a direction that bends at an acute angle with respect to the central axis O of the pipe body 2. In addition, 12a is a connecting pipe attached to the tip of the branch pipe part 12.

  Next, the operation of the bent pipe 1 of the present invention and the pipe branching structure using the same will be described.

  In order to lay a communication cable (not shown) while avoiding the sewage manhole M (see FIG. 2) buried in the ground, a bent pipe 1 is used to bend the communication cable, and then the communication cable is installed in the bent pipe 1. This is done by inserting it.

  In order to perform bent piping with the bent pipe 1, as shown in FIG. 2, many bent pipes 1 are connected and piped in a desired direction. Here, in each bent tube 1, since the bending portion 3 is bent with a predetermined radius of curvature R, the central axis O passing through the center of the bent tube 1 is bent. Therefore, by connecting the bent pipe 1, it can be easily piped in a desired direction.

  At this time, the tube body 2 of each bent tube 1 has a connection opening 5 at one end and an insertion opening 6 at the other end. Therefore, the insertion opening 6 of the adjacent bent tube 1 can be inserted into the connection opening 5 of the bent tube 1 and can be connected by connection, and the adjacent bent tubes 1 can be easily connected to each other.

  Further, in the region A (shown in FIG. 2) A in which the bent pipe 1 is used for bending piping, in order to branch the pipe, first, the straight line of the bent pipe 1 located closest to the position where the branch is desired to be branched. A branch through hole 7 is formed in the portion 4. In addition, since the method of forming the branch through-hole 7 is well-known, detailed description is abbreviate | omitted.

  Here, since this linear part 4 has the length which can form the branch through-hole 7 at least, it is possible to form the branch through-hole 7 reliably.

  Moreover, since the pipe body 2 is not curved at the straight portion 4 that forms the branch through hole 7, the branch through hole 7 can be easily formed.

  In particular, as shown in FIG. 3, the inserted communication cable K is not easily biased inside the straight portion 4, and the branch through hole 7 can be formed without damaging the communication cable K.

  That is, when the communication cable K is inserted, it is desirable to insert the communication cable K as linearly as possible. Therefore, in the bending part 3 of the pipe body 2, the communication cable K is inserted in a state of being biased near the inner surface of the inside of the pipe body 2 (see FIG. 3).

  On the other hand, since the pipe body 2 itself is straight in the straight portion 4, the communication cable K is also inserted in a substantially straight state without being biased.

  Therefore, in the straight line portion 4, the position of the internal communication cable K can be easily estimated, and the opening work for forming the branch through hole 7 can be easily performed.

  In this case, the branch through hole 7 cannot be formed in the straight portion 4 of the bent pipe 1 located immediately below the sewage manhole M because the sewage manhole M becomes an obstacle.

  Further, in the above-described bent tube 1, the bending portion 3 is located in the vicinity of one end of the tube body 1, and the straight portion 4 continues from the bending portion 3 to the other end, so that the effective length of the tube body 2 is increased. Even if it is a comparatively short case, the linear part 4 can be ensured long.

  Moreover, since the above-mentioned bending part 3 is located in the vicinity of the connection opening part 5 formed in the pipe | tube main body 2, in order to change the effective length L of the pipe | tube main body 2, the insertion opening part 6 side is cut | disconnected. However, the bending portion 3 is not lost.

  Therefore, the length of the pipe body 2 can be finely adjusted at the construction site and the like, and the usability of the bent pipe 1 can be improved.

  Then, the formed branch through hole 7 is opposed to the insertion hole 11 a formed in the saddle portion 11 of the branch pipe joint 10, and the saddle portion 11 is fixed to the straight portion 4 of the pipe body 2. At this time, an adhesive is applied between the saddle portion 11 and the tube body 2 and fixed with a stainless steel band or the like.

  In this way, a bent pipe that avoids obstacles such as the sewage manhole M is provided, and at the same time, a branch through hole 7 is easily formed in the pipe body 2 even in the area A where the bent pipe is provided. 10 can be attached to branch the pipe.

  As described above, the bent tube 1 of the present invention includes the tube main body 2 having the curved portion 3 formed in the intermediate portion and the straight portion 4 continuous from the curved portion 3, and the straight portion 4 includes at least The length is such that the branch through-hole 7 formed in the tube body 2 can be formed.

  As a result, the branch through hole 7 can be easily formed in the straight portion 4 continuous from the curved portion 3, and the pipe line can be branched from the straight portion 7.

  Even when the communication cable K is inserted into the pipe body 2, the internal communication cable K is not easily biased in the straight portion 4, and the position of the communication cable K can be easily estimated. 7 can be formed.

  On the other hand, since the pipe body 2 has the curved portion 3, it is possible to perform bending piping in a desired direction by combining a plurality of the bent pipes 1.

  In this way, bent piping can be performed, and at the same time, the branch through hole 7 can be easily formed to branch the pipe.

  Further, the bending portion 3 is located near one end of the tube main body 2, and the straight portion 4 continues to reach the other end of the tube main body 2.

  Thereby, even if the effective length of the pipe main body 2 is comparatively short, the linear part 4 can be ensured long.

  Further, the tube body 2 has a connection opening 5 having a large inner diameter at one end, and an insertion opening 6 having an outer diameter that is the same inner diameter as the intermediate portion and can be inserted and connected into the connection opening 5 at the other end. have.

  Thereby, the insertion opening 6 of the bent tube 1 adjacent to the connection opening 5 of the bent tube 1 can be inserted to enable insertion connection, and the plurality of tube main bodies 2 can be reliably and easily connected. And the bending piping to a desired direction can be performed easily.

  Further, the pipe branching structure of the present invention includes the bent pipe 1 and a branch pipe joint 10 attached to the bent pipe 1. The bent pipe 1 has a branch through hole 7 formed in the straight portion 4, and is branched. The pipe joint 10 includes a saddle portion 11 attached to the peripheral edge portion of the branch through hole 7 and a branch pipe portion 12 extending from the saddle portion 11.

  As a result, by connecting a large number of bent pipes 1, it is possible to perform a bent pipe that bends the pipe line in a desired direction, and at the same time, within the region A where the bent pipe is provided, the straight line of the bent pipe 1. The pipe line can be branched from the portion 4.

  Therefore, efficient piping can be performed, and it is not necessary to perform a long-distance pull-in construction, thereby enabling cost reduction.

  Although one embodiment according to the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to the above-described embodiment. Design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the above-described embodiment, the connection opening 5 is formed at one end of the tube main body 1 and the insertion opening 6 is formed at the other end. There may be no so-called connection part.

  In the above-described embodiment, the bending portion 3 is located in the vicinity of the connection opening 5, but may be formed in the vicinity of the insertion opening 6.

It is the side view which fractured | ruptured a part which shows the bending pipe and branch pipe joint which concern on this invention. It is explanatory drawing which shows the bending piping which uses the bending pipe of this invention. It is explanatory drawing which shows the state which penetrated the communication cable in the bending pipe | tube of this invention. It is the side view which fractured | ruptured a part which shows the conventional bending pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Curved pipe 2 Pipe body 3 Bending part 4 Straight part 7 Branching through-hole

Claims (4)

In a bent pipe that passes through a communication cable,
With an intermediate portion curved portion formed in, it possesses a straight portion continuous from the curved portion, and the pipe main body to 1000mm effective length,
The straight portion has at least a branch through hole for connecting the branch pipe joint set to a length that can be formed in the pipe body, is longer than the curved portion, and passes through one end of the curved portion. When the angle formed between the central axis through the other end of the bending portion by an obtuse angle, bent pipe, characterized in that to allow formation of the branch holes while inserting the communication cable.   2. The bent pipe according to claim 1, wherein the curved portion is located in the vicinity of one end of the tube main body, and the straight portion continues to the other end of the tube main body.   The tube body has a connection opening having a large inner diameter at one end and an insertion opening having an outer diameter that is the same inner diameter as that of the intermediate portion and can be inserted and connected into the connection opening at the other end. The bent pipe according to claim 1 or 2, wherein the bent pipe is provided. A bent pipe according to any one of claims 1 to 3, and a branch pipe joint attached to the bent pipe, wherein the bent pipe has a branch through hole formed in the straight portion, and the branch pipe The joint has a saddle portion attached to a peripheral edge portion of the branch through-hole and a branch pipe portion extending from the saddle portion.

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