JP2000154508A - Intermediate part clamp structure of covered cable and intermediate part clamp metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the treatment in a crossing section of cables in a covered cable used in a main rope for anticorrosion as a structural member for support by utilizing an intermediate part clamp structure and an intermediate part clamp metal fitting suitable for the structure without impairing the anticorrosion effect and provide compact formation of a device. SOLUTION: A bare wire core part 2 is formed by peeling a covering at a position of an intermediate part of a covered cable 1, which consists of a metallic cylindrical pipe which can be fitted in the covered cable 1 and has a length corresponding to the bare wire core part 2 and covered terminal parts 3 in contact with both sides thereof. An inside diameter of both end parts 4a which become parts surrounding both covered terminal parts 3 is smaller than an inside diameter of an intermediate part 4b which becomes a part surrounding the bare wire core part 2. An outer covered pipe 4 in which an inner face of the intermediate part 4b is formed into a projecting and recessed face 5 is fitted in peripheries of the bare wire core part 2 and both covered terminal parts 3. A spacer 6 which is formed by a material having lower hardness than that of the outer covered pipe 4 and consists of a vertically split pipe is inserted and provided in a cavity between the outer covered pipe 4 and the bare wire core part 2, and then the outer covered pipe 4 is fixed on the bare wire core part 2 and both covered terminal parts 3 by pressing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a suspension cable or a wind resistant cable is connected to an intermediate portion of a covered cable used for a main cable as a supporting structural member in a suspension structure, a membrane structure building, a suspension bridge, and the like. The present invention relates to an intermediate portion clamp structure of a covered cable which is preferably used, and an intermediate portion clamp fitting such as a cross fitting and a connecting fitting used in combination with the intermediate clamp structure.

[0002]

2. Description of the Related Art In recent years, a cable used for a main rope as a supporting structural member in a suspension structure, a membrane structure building, a suspension bridge, and the like has been coated with a cable for corrosion protection. A coated cable using a resin coating material such as that described above has been widely used.

In a suspension structure, a membrane structure building, a suspension bridge, and the like, there are many intersections between cables, and a large sliding force acts on these intersections. This sliding force has been dealt with by frictional joining by bolting. However,
For insulated cables, it is difficult to secure long-term safety due to the creep phenomenon of the resin coating material, and the coefficient of friction is lower than that of metal. Conventionally, if the crossing metal is smaller than the metal and the sliding force is large, it can only be handled by a huge crossing bracket, so the crossing bracket and cable band are peeled off and the crossing bracket and cable band are connected to the cable. I had to take the method of attaching to the surface.

[0004] However, in the above method, moisture such as rainwater penetrates from the joint of the crossing bracket and the cable band, and also penetrates between the covering material and the cable core, which is a weak point in anticorrosion. I was In addition, the frictional joining of the cable and the bracket due to the axial force of the bolt prevents slippage of the bracket and damage to the cable, and it is necessary and sufficient to consider the amount of decrease in bolt axial force that occurs over time. It is necessary to tighten the bolts with great force, and there is a problem that the working efficiency is poor.

Further, a method is used in which a cylindrical tube made of steel or the like is fitted to a cable, fixed by a press or the like, and a clamp plate is clamped thereto (see Japanese Patent Application Laid-Open No. 7-247513). Some have tried to do this,
As illustrated in FIG. 4 (A), a hollow cylindrical tube 26 is fitted to the intermediate portion of the covered cable 1 and fixed by a press or the like, but is directly fixed on the covered cable 1. In this case, of course, the coating material becomes an obstacle, so that reliable fixing cannot be performed.

On the other hand, as shown in FIG. 4B, if the sheath of the coated cable 1 is peeled off and the coating is performed in the same manner as in the example of FIG. 1
The hollow portion needs to be larger than the outer diameter of the sheathed cable 1 so that it can be fitted between the cylindrical tube 26 and the sheathed cable 1 when brought to the portion to be fixed. A gap is inevitable, and as a result, there is a problem that the cylindrical tube 26 cannot be securely fixed to the coated cable 1 even when pressed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a cable-to-cable communication system, particularly for a coated cable used for corrosion protection. By using a new intermediate clamp structure and an intermediate clamp fitting suitable for the intersection in the processing of the intersection, it is possible to reduce the size without compromising the anticorrosion effect, and to improve the efficiency of the mounting work. It is to make.

[0008]

The present invention has the following configuration to achieve the above object. That is, the invention of claim 1 according to the present invention forms the bare wire core portion 2 by stripping the coating at the position of the intermediate portion of the covered cable 1, while being capable of being fitted to the covered cable 1 and the bare wire core portion. 2 and a covering end 3 which is in contact with both sides thereof. The covering 2 comprises a metal cylindrical tube having a length corresponding to the length of the covering end 3. The inside diameter of both ends 4a surrounding the covering end 3 surrounds the bare core 2. A jacket tube 4 having a smaller diameter than the inner diameter of the intermediate portion 4b, which is a portion, and having the inner surface of the intermediate portion 4b formed on the uneven surface 5, is provided around the bare wire core 2 and the both coated end portions 3. At the same time, the space between the jacket tube 4 and the bare wire core 2 is
After inserting a spacer 6 made of a vertically split tube having a lower hardness than the outer tube 4, the outer tube 4 is fixed to the bare core portion 2 and both coated end portions 3 by pressing. A clamp structure for an intermediate portion of a covered cable characterized by the following.

According to a second aspect of the present invention, there is provided a cross metal fitting 7 provided so as to surround a portion where two of the intermediate portion clamp structures of the coated cable have the structure described in the first aspect. A stepped semi-circular groove 12a having a smaller diameter than the intermediate portion at both ends for inserting the semi-peripheral portion of the jacketed cable 4 and the sheathed cable 1 in contact with both sides in the intermediate portion clamp structure. A first saddle member 9 provided on one side of the intermediate clamp structure, and a stepped semi-circular groove 12a having the same shape as that of the first saddle member 9 on one side; A stepped semi-circular groove 12b is formed on the opposite side of the tube 4 and a semi-peripheral portion of the sheathed cable 1 in contact with both sides thereof. For the intermediate clamp structure A second saddle member 10 interposed therebetween and attached thereto, and a third saddle member 11 provided with a stepped semi-circular groove 12b having the same shape as that on the opposite surface side of the second saddle member 10 and attached to the other intermediate clamp structure. And the joined first
A plurality of connecting bolts 13 which penetrate through the third saddle members 9, 10, 11 to fasten the saddle members integrally;
And a clamp for an intermediate portion of the coated cable.

According to a third aspect of the present invention, there is provided a connecting metal fitting 8 provided so as to be surrounded by an intermediate clamp structure of a covered cable according to the first aspect of the present invention. The intermediate portion clamp structure includes a stepped semi-circular groove 12c having both ends for inserting the semi-peripheral portion of the covered cable 1 and the semi-peripheral portion of the covering cable in contact with both sides thereof with a smaller diameter than the intermediate portion. A pair of band members 16, 1 formed in a symmetrical shape capable of sandwiching the
6, a plurality of joining bolts 17 for penetrating the joined pair of band members 16 and 16 to fasten the two band members 16 and 16 integrally, and a pair of bands for branching and connecting another cable. And a cable connecting means (18) provided between the members (16, 16).

According to the present invention, when the intermediate cable clamp structure is processed on the coated cable 1, the coating material at this portion is peeled off to form the bare core 2, and the jacket tube 4 is connected to the cable end. At this time, a gap corresponding to the thickness of the exfoliated coating material is formed between the jacket tube 4 and the bare wire core 2. This gap becomes unnecessary when the jacket tube 4 is pressed. Therefore, in order to fill the gap and firmly press the jacket tube 4 and the bare wire core 2 with a press, an uneven surface 5 is first formed on the inner wall of the intermediate portion 4b of the jacket tube 4, A spacer 6 made of a vertically split tube made of a material having a thickness similar to that of the material and having a lower hardness than the outer tube 4 and preferably having a lower hardness than the cable core is inserted into the gap. .

When press working is performed under these conditions, the inner portion of the interposed spacer 6 cuts into a concave groove formed between the cable cores, and the uneven surface 5 cuts into the outer portion of the spacer 6, resulting in an outer portion. The tube 4 and the bare wire core 2 are securely and firmly crimped. The crimping efficiency in this case is determined by the length of the jacket tube 4 in the longitudinal direction of the covered cable 1 and the length of the spacer 6.

Further, at the time of crimping, both end portions 4a of the jacket tube 4 are formed.
Of the inner wall side of the inner wall side of the cover tube 3 also penetrates into the covering end portion 3 with an appropriate crimping force, so that a sealing effect between the metal (sheath tube 4) and the synthetic resin (cable covering) works, and the inside of the sheath tube 4 and outside air Is airtightly shut off to prevent intrusion of moisture and the like.
With respect to this sealing effect, an actual effect can be obtained by setting the length of both end portions 4a of the jacket tube 4 in the longitudinal direction of the covered cable 1 to an appropriate value.

The intermediate metal clamp structure thus formed is sandwiched and joined by the cross metal fittings 7 including the first to third saddle members 9, 10, 11 so that the sliding power at the intersection is reduced. The crimping forces between the intermediate clamp structures oppose each other, and the intersections between the covered cables 1 can be firmly fastened. The same can be said for the metal fitting 8 including the pair of band members 16.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1A shows an embodiment of a clamped structure of an intermediate portion of a coated cable according to a first embodiment of the present invention.
Is a longitudinal sectional view of a state before processing, and (B) is a perspective view of a state after processing. In FIG. 1, reference numeral 1 denotes a covered cable, which has a structure in which the periphery of a wire core is covered with a covering material made of a synthetic resin such as nylon or polyethylene. The sheath at the intermediate portion of the sheathed cable 1 is stripped off for an appropriate length to form the bare core 2.

In FIG. 1, reference numeral 4 denotes an outer tube, which is a cylindrical tube made of metal such as steel, stainless steel, or aluminum alloy. The outer tube 4 is fitted from the end of the sheathed cable 1. It is formed into a tube having a possible inner diameter, and is formed of a bare wire core 2 and a coated end portion 3 having a length substantially equal to or slightly shorter than the outer diameter of the cable 1 at a coating portion contacting on both sides thereof. It has a tube length corresponding to the total length, and has a smaller diameter than the inner diameter of the intermediate portion 4b which surrounds the bare wire core 2 and has an inner diameter of both end portions 4a which surround the both coated end portions 3. And the inner surface of the intermediate portion 4b is formed as an uneven surface 5. On the other hand, reference numeral 6 denotes a short tubular spacer made of a vertically split pipe, for example, a half split pipe, which is inserted into a gap existing between the bare wire core 2 and the intermediate portion 4b of the jacket pipe 4 around the core.

When the intermediate cable clamp structure is processed on the coated cable 1, a bare core 2 is formed in this processed portion, and the sheath tube 4 is fitted from the end of the cable to form the bare core. In this case, a gap corresponding to the thickness of the peeled coating material is formed between the jacket tube 4 and the bare core 2 at that time. Needless to say, this gap corresponds to an unnecessary portion when the jacket tube 4 is compressed by a press. In order to fill the gap and firmly press the jacket tube 4 against the surface of the bare wire core 2, a spacer having a thickness adapted to the gap around the bare wire core 2 before the crimping process. 6 is attached.

Since the spacer 6 is formed by a vertically split pipe such as a half split pipe, it is not necessary to fit the spacer 6 from the end of the cable. That is, from the end of the sheath tube 4 fitted around the bare wire core portion 2 and both sheathed terminal portions 3, the sheath tube 4 is inserted into the sheath tube 4 by using a gap formed around the sheathed cable 1. It can be easily set by inserting it. Under these conditions,
When the press processing of the jacket tube 4 is performed, the inserted spacer 6
The inner peripheral surface of the sheath bites into the surface groove of the bare wire core portion 2, and at the same time, the uneven surface 5 of the outer sheath tube 4 bites into the outer peripheral surface of the spacer 6, so that the outer sheath tube 4 and the bare wire core portion 2 are mechanically connected. Press firmly on.

Also, at the time of crimping, the inner wall projections of both end portions 4a of the jacket tube 4 bite into the coating terminal portion 3 appropriately, so that the metal-resin sealing effect works properly and the inside of the jacket tube 4 And the outside air around the insulated cable 1 is airtightly shut off to prevent intrusion of moisture and the like. The outer tube 4
It is necessary to use a spacer 6 of a material whose hardness is lower than that of the jacket tube 4 to be used in order to make the outer peripheral surface of the spacer 6 bite.

The thickness of the spacer 6 is preferably approximately the same as the thickness of the covering material of the coated cable 1. On the other hand, the irregular shape of the irregular surface 5 formed on the jacket tube 4 is approximately the same as the thickness of the spacer 6. It is preferable to use a screw shape having a height of 0.5 mm.

FIG. 2A is a plan view of a crossing metal fitting 7 as an intermediate clamping metal fitting of a coated cable according to a second embodiment of the present invention, and FIG. Also, each of them is shown in a separate vertical sectional view in FIG. In FIG. 2, reference numeral 1 denotes a covered cable, which has the same structure as the covered cable of the same reference numeral in the first embodiment. In the case of the second embodiment, two covered cables 1 are orthogonal. It is stretched over. Two intermediate clamp structures having the same structure as that of the first embodiment shown in FIG. 1 are provided orthogonally to each other at the orthogonally interposed cable intermediate portions. A cross fitting 7 is provided.

The cross bracket 7 is formed of three members, a first saddle member 9, a second saddle member 10, and a third saddle member 11, which are made of metal such as steel, stainless steel, and aluminum alloy. Each of the saddle members 9 to 11 is in the form of a rectangular plate, and the first saddle member 9 is one intermediate clamp provided on the sheathed cable 1 extending in the left-right direction in FIG. A member for attaching to the structure, wherein both end portions for inserting the semi-peripheral portions of the jacket tube 4 and the sheathed cable 1 in contact with both sides thereof in the one intermediate portion clamp structure are smaller in diameter than the intermediate portion. A stepped semi-circular groove 12a is formed on one side.

The second saddle member 10 is connected to the two intermediate clamp structures at a point where the two intermediate clamp structures provided on the two covered cables 1 extending in the left-right direction and the vertical direction in FIG. On the other hand, a stepped semi-circular groove 12a having the same shape as that of the first saddle member 9 is recessed on one side, and is a member for interposing and attaching therebetween. A stepped semi-circular groove 12b formed by forming both ends of the tube 4 and the semi-peripheral portion of the sheathed cable 1 in contact with both sides thereof with a smaller diameter than the intermediate portion is provided with respect to the stepped semi-circular groove 12a. It is recessed on the opposite surface side at right angles.

The third saddle member 11 is a member to be attached to the other intermediate clamp structure provided on the covered cable 1 extending in the vertical direction in FIG. 2, and is opposite to the second saddle member 10. A stepped semi-round groove 12b having the same shape as that provided on the side is concavely formed on one side.

First to third saddle members 9, 10, 11
2C, as shown in FIG. 2 (C), is joined in a three-layer state to the intersection of the two intermediate part clamp structures. In this joined state, bolts are inserted into a plurality of, for example, four, locations corresponding to each other. Through holes 14 are respectively drilled, and after inserting four joining bolts 13 into each through hole 14,
By tightening with the nut 15, the respective saddle members 9, 10, 11 are fastened together so that the two intersecting intermediate clamp structures can be watertightly surrounded.

As described above, when the intersection between the intermediate clamp structures is fastened by the cross bracket 7, the crimping force between the intermediate clamp structure and the sheathed cable 1 antagonizes the sliding force generated at the intersection, The fastening of the intersection can be held until either the intermediate clamp structure slides against the insulated cable 1 or the cross bracket 7 is pressed against the intermediate clamp structure and breaks. For this reason, the bolt tightening force required in the bolted friction joining method is unnecessary, and only the tightening force for the purpose of joining the crossing brackets is sufficient.The management of the axial force of the bolt is reduced, and the mounting work efficiency is reduced. To rise. Similarly, the size of the cross fitting required in the friction welding method can be reduced by employing the cross fitting 7 according to the present embodiment.

FIGS. 3A and 3B are a front view and a side view, respectively, of a connection fitting 8 as an intermediate clamp of a coated cable according to a third embodiment of the present invention. Each of them is shown, and is also shown in plan view in FIG. The connection fitting 8 is a metal fitting made of steel, stainless steel, aluminum alloy, or the like, and is formed in a symmetrical shape that can clamp the intermediate clamp structure of the covered cable 1 from both sides and join them in a palm-shape manner. Pair of band members 16, 1
It consists of six.

At each of the band members 16, 16 where the intermediate clamp structure is sandwiched, both ends for inserting the jacket tube 4 in the intermediate clamp structure and the semi-peripheral portions of the coated cable 1 in contact with both sides thereof are provided. A stepped semi-circular groove 12c formed to have a smaller diameter than that of the intermediate portion is formed in a recess, and further, through holes for inserting bolts at a plurality of, for example, four, positions corresponding to each other in a joined state. Each of the band members 16 and 16 is integrally fastened by inserting four joining bolts 17 into the respective through holes 18 and then tightening the nuts 19 to thereby form an intermediate portion. The clamp structure can be held in a watertight manner.

The connection fitting 8 is further provided with a cable connection means 20 for branching and connecting another cable. The cable connecting means 20 includes, for example, the two band members 1 opposed to each other with a space portion interposed therebetween.
A pair of band members formed by a through hole 23 coaxially drilled at each end of each of the pins 6 and 16, a pin 21 inserted through both the through holes 23, and a nut 22 screwed to the pin 21. 16 and 16 are provided.

In such a connection metal fitting 8, both band members 16, 16 are integrally fastened by joining bolts 17 and nuts 19 to be clamped by an intermediate clamp structure, and a cable eye 25 is provided at an end. By inserting the cable eye portion 25 of the cable 24 into the space and connecting the cable eye portion 25 with the pin 21 and the nut 22, the connection between the intermediate portion of the covered cable 1 and another cable 24 can be completed. . The effect of the connection metal fitting 8 is the same as that described for the cross metal fitting 7, so that the description is omitted.

[0032]

The present invention is embodied in the form described above and has the following effects.

That is, according to the present invention, it is possible to simply and surely form an intermediate clamp structure having anticorrosion properties for a covering cable used for a supporting structural member in a suspension structure, a membrane structure building, a suspension bridge, and the like. In addition, it is possible to simplify and reduce the size of the cross-fittings and connecting fittings for the insulated cable, and to improve the installation workability and fastening performance on the insulated cable installation site, and to install the insulated cable. The reliability and economy of the construction can be significantly improved.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view showing a state before processing of an intermediate clamp structure of a covered cable according to a first embodiment of the present invention, and FIG. 1B is a perspective view showing the same state after processing.

FIG. 2 (A) is a plan view of an intermediate clamp of a coated cable according to a second embodiment of the present invention, FIG. 2 (B) is a front view thereof, and FIG. .

FIG. 3A is a front view of an intermediate clamp of a coated cable according to a third embodiment of the present invention, FIG. 3B is a side view thereof, and FIG. 3C is a plan view thereof.

FIG. 4A is a longitudinal sectional view of a first example of a conventional intermediate portion clamp structure of a coated cable, and FIG. 4B is a longitudinal sectional view of a second example of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insulated cable 2 ... Bare wire core part 3 ...
Coated end portion 4 ... Coated tube 4a ... End portions 4b ...
Middle part 5: Uneven surface 6: Spacer 7:
Crossing bracket 8 Connection bracket 9 First saddle member 10
Second saddle member 11: third saddle member 12a: stepped semi-circular groove 12b
... Stepped semi-round groove 12c ... Stepped semi-round groove 13 ... Joint bolt 1
4 ... Through-hole 15 ... Nut 16 ... Band member 17
... joining bolts 18 ... through holes 19 ... nuts 20
... Cable connecting means 21 ... Pin 22 ... Nut 23
... through-hole 24 ... cable 25 ... cable eye 26
… Cylindrical tube

Claims (3)

[Claims] 1. A bare wire core is formed by peeling a sheath at an intermediate portion of a sheathed cable, and the bare wire core is fittable to the sheathed cable and corresponds to the bare wire core and a sheathed terminal portion which is in contact with both sides thereof. It is made of a metal cylindrical tube of a given length, and the inner diameter of both ends, which are portions surrounding both coated end portions, is smaller than the inner diameter of an intermediate portion, which is a portion surrounding the bare wire core, and The outer tube formed by forming the inner surface of the intermediate portion on the uneven surface is fitted around the bare wire core portion and both coated terminal portions, and in the gap existing between the outer tube and the bare wire core portion, Coated cable characterized in that after inserting a spacer consisting of a vertically split tube of a material having a lower hardness than the sheath tube, the jacket tube is fixed to the bare core and both sheathed ends by pressing. Intermediate clamp structure. 2. A cross metal fitting which is provided so as to surround a portion where two intermediate clamp structures of a coated cable having the structure according to claim 1 intersect, and a jacket tube and a sheath tube in one intermediate clamp structure. A first saddle having a stepped semi-circular groove formed with a smaller diameter at both ends for inserting a semi-peripheral portion of the coated cable contacting both sides as compared with the intermediate portion, and attached to the one intermediate portion clamp structure; A member and the stepped semi-circular groove having the same shape as that of the first saddle member are provided on one side, and the semi-peripheral portion of the jacketed cable in the other intermediate clamp structure and the coated cable in contact with both sides thereof is inserted. A second saddle member, which is provided on the opposite surface side with a stepped semi-circular groove formed by forming both end portions to have a smaller diameter than the intermediate portion, and interposed between and attached to both intermediate portion clamp structures; Opposite side of 2 saddle member A third semi-circular groove having the same shape as that of the second intermediate portion and attached to the other intermediate clamp structure;
An intermediate clamp metal fitting for a covered cable, comprising: a saddle member; and a plurality of joining bolts that penetrate the joined first to third saddle members and integrally fasten the saddle members. 3. A connecting metal fitting provided around the intermediate clamp structure of the coated cable having the configuration according to claim 1, wherein the semi-periphery of the jacketed cable and the coated cable in contact with both sides thereof in the intermediate clamp structure. It has a stepped semi-circular groove formed with a smaller diameter than the intermediate part at both end parts for inserting the part, and is formed into a symmetrical shape that can sandwich the intermediate part clamp structure and join in a palm-shape manner. A pair of band members,
A plurality of joining bolts are inserted through the joined pair of band members to fasten the two band members together, and are provided between the pair of band members to branch and connect another cable. And a cable connecting means.