JP3075394U - Mandrel for communication pipeline - Google Patents

Abstract

(57) [Problem] It is difficult for a conventional mandrel to pass through a main body of a communication pipe at a point where the curve of the communication pipe is sharp, and the like. If another cable is present, it is difficult to insert it into the communication conduit. SOLUTION: A communication pipe 12 arranged between manholes.
A mandrel for testing the passage performance of a cylinder body 2 having a slightly smaller diameter than the communication conduit 12 and having both ends closed by a first cap 3 and a second cap 4. , A weight 5 is movably stored, a wire 6 penetrating the first cap 3 is connected to one of the weights 5, and a push rod 7 penetrating the second cap 4 is connected to the other of the weights 5. The body 2 is divided into a plurality so as to be freely joined.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the present invention pertains] The present invention relates to a mandrel for investigating the passage performance of a communication line prior to embedding a cable in the communication line arranged between manholes. It is.

[0002]

2. Description of the Related Art Generally, a communication cable is provided in a communication pipe buried between underground manholes. However, when a cable is passed through the communication pipe, a mandrel is provided before the cable. A passing performance test is conducted.

[0003] Conventionally, the mandrel used for the passing performance test is formed by processing the main body portion of wood and molding the same, passing a wire rod through the center thereof, and connecting a tow rope or the like to the mandrel. I have.

[0004] However, in the conventional mandrel, if the main body of the mandrel cannot pass at a point where the curve of the communication pipe is steep during the passage performance test, the manhole on the opposite side is not used. , But the drawing operation has been a difficult and time-consuming operation.

Further, in the conventional mandrel, since the main body portion is a long single body, at a portion where the cable in the manhole is congested, an entrance portion of a communication pipe to be subjected to a passage performance test is provided. Often blocked by other cables, it was difficult to insert and remove the mandrel in the communication conduit.

[0006]

[Problem to be solved by the invention] The problem to be solved is that the conventional mandrel is difficult to pass through the main body at a point where the communication pipeline has a sharp curve, etc. If another cable exists at the entrance of the communication line, it is difficult to insert and remove the cable in the communication line.

[0007]

A description will be given with reference to FIGS. 1 to 6. The first invention is a mandrel for testing the passage performance of the communication line 12 provided between the manholes 13, and the first end of the cylindrical body 2 having a slightly smaller diameter than the communication line 12 is first. A weight 5 is movably housed in the main body 1 closed by the cap 3 and the second cap 4, and one of the weights 5 is connected to a wire 6 passing through the first cap 3, while the other is connected to the other. And a push rod 7 penetrating through the second cap 4.

The second device is a mandrel for testing the passage performance of the communication line 12 disposed between the manholes 13, and is provided at both ends of the cylindrical body 2 having a slightly smaller diameter than the communication line 12. The weight 5 is movably accommodated in the main body 1 having its part closed by the first cap 3 and the second cap 4, and a wire 6 penetrating the first cap 3 is connected to one of the weights 5. At the same time, a push rod 7 penetrating the second cap 4 is connected to the other end, and the main body 1 is divided into a plurality of parts so as to be freely joined.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a communication pipe mandrel according to the first invention are shown in FIGS. This mandrel is for testing the passage performance of a communication pipe 12 having an inner diameter of about 80 mm, which is disposed between manholes 13 provided at intervals of 50 to 100 meters. In the mandrel, the right end of the cylindrical body 2 having an outer diameter of 73 mm, which is slightly smaller than the inner diameter of the communication conduit 12, is closed by the first cap 3 and the left end is closed by the second cap 4. The main body 1 is constituted. The length of the main body 1 is 600 mm.

A weight 5 is slidably housed in the main body 1, and a wire 6 passing through the through hole 3 a of the first cap 3 is connected to the right half of the weight 5, A push rod 7 penetrating through the through hole 4a of the second cap 4 is connected to one half. The wire 6 and the right half of the weight 5 are fixed with screws 11, and the push rod 7 and the left half of the weight 5 are engaged with the enlarged portion 7 a of the push rod 7 in the locking recess 5 a of the weight 5. By assembling.

[0011] Assembling of the cylindrical body 2, the first cap 3 and the second cap 4 is achieved by screwing. The weight 5 is divided into two parts, a left half and a right half, so that the two parts can be freely assembled. An eye nut 8 is screwed and assembled to the tip of the push rod 7. The eye nut 8 can be removed and screwed with the extension rod 10 via a connection jig 9.

The operation of the mandrel will be described. When performing the passage performance test of the communication conduit 12 using the mandrel, if the main body 1 of the mandrel cannot pass through a sharp curve or the like, the wire 6 is strongly pulled. As a result, the weight 5 hits the first cap 3 and the main body 1 can be pulled back by the impact force. Similarly, the weight 5 can be pressed against the first cap 3 or the second cap 4 by strongly pulling or pushing the push rod 7 at a sharp curve or the like, and the impact force can be pulled out.

Further, since the mandrel is provided with the push rod 7, the push rod 7 can be pushed and passed through in addition to being pulled by the wire 6 and passed through the communication conduit 12. The mandrel having such a structure is convenient because it can be used for a test of the passage performance of the communication pipe 12 having one side closed.

An embodiment of a communication channel mandrel according to the second invention is shown in FIGS. 1, 5 and 6. The feature of this mandrel is that, in addition to the feature of the mandrel according to the first invention, the main body 1 is divided into three parts, and is constituted by a first cylindrical part 1a, a second cylindrical part 1b and a third cylindrical part 1c. . By doing so, the long main body 1 can be divided into three short parts.

Therefore, even if the cable is congested in the manhole 13 and the entrance portion of the target communication conduit 12 is covered with a plurality of other cables, and there is not a sufficient space in the front portion of the entrance, Then, the main body 1 of the mandrel is divided and made into a short shape. First, the first cylindrical portion 1a is inserted, and then the second cylindrical portion 1b is assembled and inserted into the first cylindrical portion 1a. By assembling and inserting the third cylindrical portion 1c into the second cylindrical portion 1b, the long main body portion 1 can be easily inserted as a whole, and can be removed by disassembly.

The first tubular portion 1a, the second tubular portion 1b, and the third tubular portion 1c are assembled in a fitting manner in consideration of ease of assembly. It should be noted that it is also possible to use a screwing type in consideration of a strong assembling property.

[0017]

[Effects of the Invention] In the mandrel for a communication circuit according to the first invention, since the weight 5 is movably stored in the main body 1, the weight 5 is obtained by abutting the weight 5 against the first cap 3 or the second cap 4. The impact force allows the main body 1 to smoothly pass through the communication pipe 12. Therefore, workability can be improved.

Since the push rod 7 is connected to the weight 5, the push rod 7 is pushed or pulled to push the weight 5 against the first cap 3 or the second cap 4, so that the passage of the main body 1 is prevented. It can be performed smoothly. Further, by pushing the push rod 7, the push rod 7 can be used for a passing performance test of the communication pipe 12 having one side closed, which is convenient.

The mandrel for a communication circuit according to the second invention has the effect of the mandrel according to the first invention, and also has a long main body 1 divided into a plurality of parts, each of which is made short. If necessary, it can be inserted into the communication pipe 12 in a divided state sequentially, which facilitates the insertion work. Thereby, workability is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a communication circuit provided between manholes.

FIG. 2 is a front sectional view showing a communication circuit mandrel according to the first invention.

FIG. 3 is an exploded view of the mandrel shown in FIG. 2;

FIG. 4 is a front sectional view showing a state where the mandrel shown in FIG. 2 is in a communication conduit.

FIG. 5 is a front view showing a communication circuit mandrel according to the second invention.

FIG. 6 is a front view showing a state in which a main body of the mandrel shown in FIG. 5 is disassembled.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 1a 1st cylinder part 1b 2nd cylinder part 1c 3rd cylinder part 2 cylinder 3 First cap 3a Through hole 4 Second cap 4a Through hole 5 Weight 5a Locking concave part 6 Wire 7 Push rod 7a Enlarged part 8 Eye nut 9 Connection jig 10 Extension rod 11 Screw 12 Communication line 13 Manhole

Claims (2)

[Utility model registration claims] A mandrel for testing the passage performance of a communication pipe (12) disposed between manholes (13), wherein the cylindrical body (2) has a slightly smaller diameter than the communication pipe (12). ) Is movably housed in a main body (1) having both ends closed by a first cap (3) and a second cap (4), and one of the weights (5) is accommodated. And a push rod (7) penetrating the second cap (4) and a push rod (7) penetrating the second cap (4). 2. A mandrel for testing the passage performance of a communication pipe (12) disposed between manholes (13), wherein the cylindrical body (2) has a slightly smaller diameter than the communication pipe (12). ) Is movably housed in a main body (1) having both ends closed by a first cap (3) and a second cap (4), and one of the weights (5) is accommodated. A wire (6) penetrating the first cap (3) is connected to the other end, and a push rod (7) penetrating the second cap (4) is connected to the other end. The communication pipe mandrel is divided into multiple parts.