JP2887573B2 - Connection structure of joint groove for underground cable installation and rotary tool used for the connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a common groove used when cables for electric power and communication are installed underground, and a rotary tool used for the connection.

[0002]

2. Description of the Related Art In recent years, laying various cables in a common channel built underground has been widely used because urban landscape and information security are improved.
Power and electronic information are often interrupted unexpectedly due to damage to cables that occur in conduits, which is a major problem.

[0003]

This is because the deterioration of the cable is often caused by the water entering from the connecting portion due to the displacement or looseness of the connecting portion of each prefabricated pipe forming the conduit. Therefore, conventionally, a plurality of packings have been used or the structure of the connecting portion has been improved to ensure watertightness.However, a large-scale machine is used to connect the prefabricated pipes in a watertight state. Otherwise, it is difficult to install it in a place where the burial place is narrow, and it is inefficient when a large number of humans are connected, and there is a problem that the operation involves danger.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is intended to easily and securely connect a plurality of common grooves of a prefab. The gist of the invention is to provide a funnel-shaped bolt insertion hole and a cable insertion hole in which one end opening is formed by continuously connecting a large-diameter opening and a small-diameter opening on an inclined peripheral surface. A joint groove formed respectively, a male screw portion at the tip, and a dish-shaped enlarged head continuous at the other end with a tapered peripheral surface having a cross section substantially the same shape as the opening at the one end are provided. A connecting rod inserted into the bolt insertion hole formed with a female screw portion screwed with the male screw portion in the enlarged head, and a connecting rod inserted into the bolt insertion hole of the joint groove to be connected. In the enlarged head of the connecting rod which fastens the male screw part in the existing common groove The joint groove for underground cable installation, characterized in that the tapered peripheral surface of the enlarged head presses the inclined peripheral surface of the opening and sequentially connects the inclined peripheral surface of the opening by screwing by screw connection with the internal thread portion. In the connection structure.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. 1 to 7. In the drawings, reference numeral 1 denotes a common groove formed of concrete having a rectangular cross section. The bolt insertion hole 2 penetrates in the longitudinal direction, and the one end opening 3 of the bolt insertion hole 2 has a large-diameter opening having substantially the same shape in cross section as the outer shape of the enlarged head 10 of the connecting rod 8 described later. The small-diameter opening has a funnel-shaped hole shape continuously provided on the inclined peripheral surface 3A.

Reference numeral 4 denotes a plurality of cable insertion holes formed around the bolt insertion hole 2. Each cable insertion hole 4 extends in parallel with the bolt insertion hole 2 and penetrates through the common groove 1 respectively. In addition, pipes 5 made of vinyl chloride are embedded in the plurality of cable insertion holes 4. This is to reduce the frictional resistance when inserting the cable into the cable insertion hole 4 so that the cable can be inserted relatively easily.

Reference numeral 6 denotes a metal collar joint. As shown in FIGS. 5 and 6, one end opening 6A is fitted to the outer periphery of one end of the common groove 1 via a buried packing 7, and the other. The end opening 6B extends outward from the end face 1A of the common groove 1. Reference numeral 8 denotes a connecting rod inserted into the bolt insertion hole 2, and as shown in FIG. 3, a male screw portion 9 is formed at the distal end thereof, and a dish-shaped continuous tapered peripheral surface 10A is formed at the other end. An enlarged head 10 is provided, and a female screw portion 12 screwed with the male screw portion 9 is formed in a center hole 11 of the enlarged head 10. In the figure, reference numeral 13 denotes an engaging groove formed on the outer periphery of the enlarged head 10.

Reference numeral 14 denotes a rotary tool for rotating the connecting rod 8, as shown in FIG.
Handle member 16 fitted to one end 15A of the other end 5 and the other end 1
5B and four arms 18 which are radially bent from the tip of the other end 15B and open outwardly at the same time. Each arm 18 has a claw 18A at the tip thereof for engaging with the engaging groove 13.

Next, a method of sequentially connecting the common grooves 1 underground using the rotary tool 14 will be described. As shown in FIGS. 5 and 6, first, the common grooves 1 to be connected are connected. When the other end 1B of the common groove 1-1 is brought close to one end of the joint groove 1 to which the collar joint 6 has already been connected, the other end 1B of the joint groove 1-1 is brought close to the other end.
The other end 1B of the common groove 1-1 is loosely fitted into the other end opening 6B of the second groove. At this time, packing P is fitted in the outer periphery of the other end 1B of the common groove 1-1 in advance.

Then, a connecting rod 8 is inserted into the bolt insertion hole 2 of the joint groove 1-1 to be connected from the opening 3 from the distal end thereof, and the male screw portion 9 formed at the distal end of the connecting rod 8 is inserted. The connection rod 8 fastened into the bolt insertion hole 2 of the existing common groove 1 is inserted into the center hole 11 of the enlarged head 10 of the connection rod 8 and is inserted into the female screw portion 12 formed in the center hole 11. The male screw part 9 of the rod 8 is screwed.

In this state, each arm 18 of the rotary tool 14 is
As shown in FIG. 4, the enlarged head 1 of the inserted connecting rod 8.
0, the claw portion 18A provided at the tip of each arm 18 is engaged with the concave groove 13 for engagement, and the support member 17 is supported with one hand while the handle 15 is
Is turned, the connecting rod 8 is screwed in the direction of the common groove 1 by screwing the male screw part 9 and the female screw part 12 thereof, and the enlarged head 10
10A abuts against the inclined peripheral surface 3A in the opening 3 of the common groove 1-1.

When the handle 15 is further turned to screw the connecting rod 8 into the bolt insertion hole 2, the enlarged head 10
10A presses the inclined peripheral surface 3A of the common groove 1-1 in the common groove 1 direction. In this case, the enlarged head 10 and the opening 3 of the common groove 1-1 are formed by a tapered peripheral surface 10A and an inclined peripheral surface 3A.
Since the contact is at A, the connecting rod 8 is easily moved in the direction of the common groove 1 by the rotation of the enlarged head 10 by a relatively small force. Thus, the other end 1B of the common groove 1-1 is fitted into the collar joint 6 while crushing the packing P fitted on the outer periphery,
As shown in FIG. 5, the common groove 1-1 and the existing common groove 1 are integrally connected by a connecting rod 8.

Similarly, as shown in FIG. 6, the next common groove 1-2 is connected to the connected common groove 1-1, and by repeating this operation, the desired length is obtained as shown in FIG. Since the common channel A is formed, cables are inserted into the respective cable insertion holes 4 communicating with the common channel A, and cables for electric power, communication, etc. are installed underground.

FIGS. 8 to 10 show another embodiment. The difference from the above embodiment is the structure of the common groove and the connecting rod. That is, while the common groove 1 of the above embodiment is a straight box-like body, this common groove 21
As shown in FIG. 5, both side surfaces 21A, 21A have a structure formed by a curved surface which is curved in one direction, and the connecting rod 8 in the above embodiment is a straight rod-shaped body.
As shown in FIG. 9, the connecting rods 28 each have a universal joint structure 20 in the middle, and are different from each other in structure.

[0015] As shown in FIG.
It is used when constructing a common groove that is curved in an arc shape, or when constructing a meandering common groove A1 by connecting the common grooves 21 in the left and right directions every predetermined number. In this case, Since the bolt insertion hole 22 in each common groove 21 is an arc-shaped through hole in plan view, the common grooves 21 and 21 are formed.
The connecting rod 28 for connecting the members has a universal joint structure 20 in the middle as shown in FIG. As a result, the connecting rod 28 is connected to the pivots 2 orthogonal to each other.
The enlarged head 10 bends around the center of rotation 9 and 30.
Can be transmitted to the male screw portion 9 at the distal end.

[0016]

As described above, the connection structure of the common groove for installing underground cables according to the present invention has a large-diameter port and a small-diameter port having an opening at one end connected to the inclined peripheral surface as described above. A common groove formed with a hole and a cable insertion hole, a male screw portion at the tip, and a dish-shaped enlarged head continuous at the other end with a tapered peripheral surface having a cross section substantially the same shape as the opening at the one end. And a connecting rod inserted into the bolt insertion hole formed with a female screw portion screwed with the male screw portion in the enlarged head, and the bolt insertion hole of the joint groove to be connected is provided. The male thread portion of the connecting rod inserted into the existing joint groove is screwed into the existing joint groove by screw connection with the female screw portion in the enlarged head of the connecting rod. The structure is such that the inclined peripheral surface of the opening is pressed and connected sequentially, so a simple rotation The common groove can be easily and quickly connected by hand only by using the common groove, and the common groove path is connected by a unified connecting rod group of each connecting rod connecting each common groove. Therefore, the common channel has an integral structure, and has various effects such as a large structural strength of the connecting portion.

[Brief description of the drawings]

FIG. 1 is a front view in which a part of a common groove is omitted.

FIG. 2 is a left side view of FIG.

FIG. 3 is a partially omitted perspective view in which a part of a connecting rod is cut away.

FIG. 4 is an explanatory diagram of an operation of a rotary tool used in the present invention.

FIG. 5 is a longitudinal sectional view of a connecting portion.

FIG. 6 is a partially omitted side view in which a part of a common channel is cut away.

FIG. 7 is a side view of a common channel.

FIG. 8 is a plan view of a common groove according to another embodiment.

FIG. 9 is a partially omitted perspective view of another embodiment of the connecting rod.

FIG. 10 is a plan view of a meandering common channel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint groove 1A End surface 1B Other end 2 Bolt insertion hole 3 Opening 3A Inclined peripheral surface 4 Cable insertion hole 4A Cable insertion hole 5 Pipe made of vinyl chloride 6 Collar joint 6A One end opening 6B Other end opening 7 Embedded packing P Packing 8 Connecting rod 9 Male thread 10 Enlarged head 10A Tapered peripheral surface 11 Center hole 12 Female thread 13 Groove 14 Rotary tool 15 Handle 15A One end 15B Other end 16 Handle member 17 Support member 18 Arm 18A Claw 20 Universal joint Structure 21 common groove 21A side surface 22 insertion hole 28 connecting rod A common groove A1 meandering common groove

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsutomu Abe 1-4-14 Nodacho, Fukushima City, Fukushima Prefecture Maeda Seisakusho Co., Ltd. Address Takashu Co., Ltd. (72) Inventor Setsuko Kumahara 760 Oshinuma, Ichihara-shi, Chiba 11-404 Chimiledai Family Heights (56) References JP-A-8-298717 (JP, A) JP-A-9-4386 (JP, A) JP-A-49-124835 (JP, A) JP-A 57-105342 (JP, U) JP-A 52-69135 (JP, U) JP-A 62-19032 (JP, U) JP-A 50- 69690 (JP, U) Hikaru 2-18989 (JP, U) Jiko 4-48103 (JP, Y2) Jiko 8-1496 (JP, Y1) Jiko 28-5372 (JP, Y1) Jiko 35-20559 (JP, Y1) Japanese Utility Model Showa 45-3221 (JP, Y1) Japanese Utility Model Showa 26-9746 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) H02G 9/00-9/12

Claims (3)

(57) [Claims] A joint groove having a funnel-shaped bolt insertion hole and a cable insertion hole each having a large-diameter port and a small-diameter port connected to each other on an inclined peripheral surface, and a male screw portion at a tip end. ,
The other end is provided with a dish-shaped enlarged head that is continuous with a tapered peripheral surface having substantially the same cross section as the one end opening,
A connecting rod inserted into the bolt insertion hole formed with a female screw portion screwed with the male screw portion in the enlarged head; and a connecting rod inserted into the bolt insertion hole of the joint groove to be connected. By the screwing of the connecting rod, in which the male screw portion is fastened in the existing common groove, by screw connection with the female screw portion in the enlarged head, the inclined peripheral surface of the opening is tapered by the tapered peripheral surface of the enlarged head. A connecting structure for a common groove for installing underground cables, wherein the connecting groove is configured to be pressed and sequentially connected. 2. The connection structure for a common groove for installing underground cables according to claim 1, wherein the connecting rod has one or more universal joint structures. 3. A handle member fitted to one end of a crank-shaped handle, a support member fitted to the other end, and an opening outwardly extending radially from the tip of the other end. And a plurality of arms bent into a funnel shape as a whole, and each arm is provided with a claw portion for engaging with a concave groove for engagement formed on an enlarged head at a tip end thereof. A rotary tool for use in the connection of claim 1.