JP3481475B2 - Intermediate part clamp structure of coated cable and intermediate part clamp fitting - Google Patents

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 coated cable used as a main rope as a supporting structural member in a suspension structure, a membrane structure building, a suspension bridge or the like. The present invention relates to an intermediate clamp structure of a sheathed cable which is preferably used, and an intermediate clamp metal member such as a cross metal fitting and a connecting metal fitting used in combination with the intermediate clamp structure.

[0002]

2. Description of the Related Art In recent years, coated cables have been adopted for the purpose of anticorrosion as cables used for main ropes as supporting structural members in suspension structures, membrane structures, suspension bridges, etc., especially nylon and polyethylene. Coated cables using resin coating materials such as the above have been widely used.

In suspension structures, membrane structures, suspension bridges, etc., there are many intersections between cables, and a large sliding force acts on these intersections. We have dealt with this sliding force by friction welding with bolts. However,
For coated cables, it is difficult to ensure long-term safety due to the creep phenomenon of the resin coating material by friction welding by crossing metal fittings or bolting between the cable band and the cable surface. When the sliding power is smaller than between metals and the sliding force is large, it can be handled only with a huge cross fitting, so conventionally the cross fitting and the cable band are stripped of the coating to remove the cross fitting and the cable band from the cable. I had no choice but to adopt the method of mounting on the surface.

However, in the above method, moisture such as rainwater penetrates through the joints of the cross fittings and the cable band, and further penetrates between the covering material and the cable core, which is a weak point in corrosion protection. Was there. Since the cable and metal fittings are frictionally joined to each other by the axial force of the bolt, it is necessary and sufficient to prevent slipping of the metal fittings and damage to the cable, and to consider the amount of decrease in bolt axial force that occurs over time. Since it is necessary to tighten the bolts with various forces, there is a problem that work efficiency is poor.

Also, a method is used in which a cylindrical tube made of steel or the like is fitted on a cable, fixed by a press or the like, and a clamp plate is sandwiched between them (see Japanese Patent Laid-Open No. 7-247513). There are some things I tried to do, but this is
As shown in FIG. 4 (A), a hollow cylindrical tube 26 is fitted in the middle portion of the coated cable 1 and fixed by a press or the like. As a matter of course, the covering material hinders the secure fixation as a matter of course.

On the other hand, as shown in FIG. 4 (B), if the coating of the jacketed cable 1 is stripped and the same procedure as in the example of FIG. 1
Since the hollow portion is fitted from the end of the cable, the hollow portion must have a size larger than the outer diameter of the coated cable 1. Therefore, when the hollow portion is brought to the portion to be fixed, the hollow portion between the cylindrical tube 26 and the coated cable 1 is required. There is an unavoidable occurrence of a gap, and as a result, there is a problem that the cylindrical tube 26 cannot be securely fixed to the covered cable 1 even by pressing.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a cable mutual protection method for a coated cable used particularly for corrosion protection. By using a new intermediate clamp structure and an intermediate clamp fitting suitable for it at the processing of the intersection, it is possible to achieve compactness without impairing the anticorrosion effect and to improve the efficiency of installation workability. Is to

[0008]

The present invention has the following constitution in order to achieve the above object. That is, according to the invention of claim 1 of the present invention, the bare wire core portion 2 is formed by peeling off the coating at the position of the intermediate portion of the coated cable 1, and the bare cable core portion can be fitted into the covered cable 1 and 2 and a coated end portion 3 in contact with both sides thereof, which is composed of a metal cylindrical tube having a length corresponding to both ends 4a, which surrounds both coated end portions 3, surrounds the bare wire core portion 2 with an inner diameter. A jacket tube 4 having a smaller diameter than the inner diameter of the intermediate portion 4b, which is a part of the intermediate portion 4b, and an inner surface of the intermediate portion 4b formed on the uneven surface 5 is provided around the bare wire core portion 2 and both coated end portions 3. While being fitted, in the space existing between the jacket tube 4 and the bare wire core portion 2,
After inserting a spacer 6 made of a vertical split tube made of a material having a hardness lower than that of the jacket tube 4, the jacket tube 4 is fixed to the bare wire core portion 2 and both coating end portions 3 by pressing. Is a middle clamp structure of a covered cable.

Further, the invention of claim 2 according to the present invention is a cross fitting 7 which is provided so as to be surrounded by a portion where two of the intermediate clamp structures of the coated cable having the structure of claim 1 intersect. A stepped semi-circular groove 12a is formed by forming both ends of the jacket tube 4 and the half outer circumference of the jacketed cable 1 in contact with both sides of the middle part clamp structure with a smaller diameter than the middle part. A first saddle member 9 attached to one of the intermediate clamp structures and a stepped semi-circular groove 12a having the same shape as that of the first saddle member 9 are provided on one side, and the outer cover of the other intermediate clamp structure is provided. A stepped semi-circular groove 12b is formed on the opposite surface side so that both end portions for inserting the pipe 4 and the semi-outer peripheral portion of the covered cable 1 in contact with both sides thereof are formed to have a smaller diameter than the intermediate portion. For the middle clamp structure, A second saddle member 10 interposed between and attached to the second saddle member 10 and a third saddle member 11 provided with a stepped semicircular groove 12b having the same shape as that of the opposite side of the second saddle member 10 to be attached to the other intermediate clamp structure. And the first joined
To a plurality of joining bolts 13 for inserting the third saddle members 9, 10 and 11 and fastening the saddle members together
It is an intermediate part clamp metal fitting of a coated cable characterized by including and.

Further, the invention of claim 3 according to the present invention is a connecting fitting 8 which is provided so as to be surrounded by the intermediate clamp structure of the coated cable having the structure of claim 1, and which is provided outside the intermediate clamp structure. The stepped semi-circular groove 12c is formed in which both end portions for inserting the semi-outer peripheral portion of the covered cable 4 and the covered cable 1 contacting both sides thereof are formed to have a smaller diameter than the intermediate portion, and the intermediate portion clamp structure is provided. A pair of band members 16 and 1 that are formed in a symmetrical shape so that they can be sandwiched and joined in a palm shape.
6, a plurality of joint bolts 17 for inserting the jointed band members 16 and 16 and fastening both the band members 16 and 16 together, and a pair of bands for branching and connecting another cable. It is a middle clamp metal fitting of a coated cable characterized by including a cable connecting means 18 provided between the members 16 and 16.

According to the present invention as described above, when the intermediate portion clamp structure is processed on the coated cable 1, the coating material at this portion is peeled off to form the bare wire core portion 2, and the jacket pipe 4 is connected to the cable end. Although it is fitted from the portion and brought to the position of the bare wire core portion 2, at that time, a gap corresponding to the thickness of the peeled coating material is formed between the jacket pipe 4 and the bare wire core portion 2. This gap becomes unnecessary when the jacket tube 4 is pressed. Therefore, in order to fill this gap and firmly press-bond the jacket tube 4 and the bare wire core portion 2 with a press, the uneven surface 5 is first formed on the inner wall of the intermediate portion 4b of the jacket tube 4, while the coating is performed. A spacer 6 made of a material having a thickness similar to that of the material and having a hardness lower than that of the jacket tube 4, preferably a hardness lower than that of the cable core is formed in the void portion. .

When the press working is performed under these conditions, the inner part of the inserted spacer 6 bites into the groove formed between the wire cores of the cable, and the uneven surface 5 bites into the outer part of the spacer 6, thereby The pipe 4 and the bare wire core portion 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 coated cable 1 and the length of the spacer 6.

When crimping, both end portions 4a of the jacket tube 4 are
The inner wall-side convex portion of the inside of the sheath bites into the covering end portion 3 with an appropriate pressure bonding force, so that the sealing effect between the metal (coating tube 4) and the synthetic resin (cable coating) works, and the inside of the jacket tube 4 and the outside air The airtightness of the and is blocked, and the infiltration of water and the like can be prevented.
Regarding this sealing effect, an actual effect can be obtained by setting the lengths of both end portions 4a of the jacket tube 4 in the longitudinal direction of the coated cable 1 to appropriate values.

With respect to the sliding force at the intersection, by sandwiching and joining the cross fitting 7 composed of the first to third saddle members 9, 10, 11 to the intermediate clamp structure thus formed. The crimping forces of the intermediate clamp structures oppose each other, and the intersections of the coated cables 1 can be firmly fastened. The same thing can be said for the connecting metal fitting 8 formed of the pair of band members 16, 16.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 shows an aspect of a middle portion clamp structure of a coated cable according to a first embodiment of the present invention (A).
1B is a longitudinal sectional view of a state before processing, and FIG. 7B 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 wire core is covered with a covering material made of a synthetic resin such as nylon or polyethylene. The bare wire core portion 2 is formed by stripping the coating in the middle portion of the coated cable 1 for an appropriate length.

In FIG. 1, reference numeral 4 denotes an outer jacket tube, which is a cylindrical tube made of metal such as steel, stainless steel or aluminum alloy. The outer jacket tube 4 is fitted from the end portion of the coated cable 1. A bare wire core portion 2 and a covering end portion 3 which is in contact with both sides of the bare wire core portion 2 and has a length substantially equal to or slightly shorter than the outer diameter of the cable 1; It has a pipe length corresponding to the total length, and the inner diameter of both end portions 4a, which are the portions surrounding both coated end portions 3, is smaller than the inner diameter of the intermediate portion 4b, which is the portion surrounding the bare wire core portion 2. And the inner surface of the intermediate portion 4b is formed into the uneven surface 5. On the other hand, 6 is a short tubular spacer composed of a vertically split tube, for example, a split tube, which is inserted into a space existing between the bare wire core portion 2 and the intermediate portion 4b of the outer sheath tube 4 around the bare wire core portion 2.

When processing the intermediate portion clamp structure on the coated cable 1, the bare wire core portion 2 is formed in this working portion, and the jacket pipe 4 is fitted from the cable end portion to the bare wire core portion. Although it is brought to the position 2, a gap corresponding to the thickness of the peeled coating material is formed between the jacket pipe 4 and the bare wire core portion 2 at that time. It goes without saying that this gap corresponds to an unnecessary portion when the jacket tube 4 is compressed by a press. In order to fill this void and to firmly crimp the jacket tube 4 to the surface of the bare wire core portion 2, a spacer having a thickness suitable for the void around the bare wire core portion 2 before the crimping process. 6 is attached.

Since the spacer 6 is formed of a vertically split tube such as a half-split tube, it is not necessary to fit the spacer 6 from the end of the cable. That is, from the end portion of the jacket pipe 4 fitted around the bare wire core portion 2 and both the coated terminal portions 3 into the jacket pipe 4 by utilizing the gap formed around the coated cable 1. It can be easily set by inserting it. Under this condition,
When the outer tube 4 is pressed, the inserted spacer 6
The inner peripheral surface of the above-mentioned bites into the surface groove of the bare wire core portion 2 and, at the same time, the uneven surface 5 of the outer jacket tube 4 bites into the outer peripheral surface of the spacer 6, so that the outer jacket tube 4 and the bare wire core portion 2 mechanically. Firmly crimp to.

Further, at the time of crimping, the inner wall convex portions of both end portions 4a of the outer jacket pipe 4 bite into the covering terminal portion 3 appropriately, so that the metal-resin sealing effect works properly and the inside of the outer jacket pipe 4 And the outside air around the covered cable 1 are airtightly blocked, so that infiltration of moisture or the like can be prevented. The jacket tube 4
In order to bite into the outer peripheral surface of the spacer 6, it is necessary to use the spacer 6 made of a material having a hardness lower than that of the jacket pipe 4 to be used.

The thickness of the spacer 6 is preferably set to be approximately the same as the thickness of the coating material of the coated cable 1, while the uneven shape of the uneven surface 5 formed on the jacket tube 4 is approximately the same as the thickness of the spacer 6. It is preferable to have a screw shape having a height of.

FIG. 2 is a plan view in (A) and a front view in (B) of a cross fitting 7 as an intermediate clamp fitting of a coated cable according to a second embodiment of the present invention. Further, similarly, in (C), each is shown in a separate vertical sectional view. 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, and in the case of the second embodiment, two covered cables 1 are orthogonal to each other. It is stretched across. Two intermediate clamp structures, which have the same structure as those of the first embodiment shown in FIG. 1, are provided in the intermediate portions of the cables that are orthogonal to each other so as to be orthogonal to each other. The cross fitting 7 is provided.

The cross fitting 7 is formed of three members, that is, 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 forms a rectangular plate-shaped plate body, and the first saddle member 9 among them is one intermediate portion clamp provided on the covered cable 1 extending in the left-right direction in FIG. A member for attaching to the structure, and both end portions for inserting the jacket pipe 4 and the semi-outer peripheral portions of the covered cable 1 in contact with both sides of the one outer clamp structure have a smaller diameter than the intermediate portion. The stepped semi-circular groove 12a formed in the above is recessed on one side.

The second saddle member 10 has two intermediate clamp structures provided at both covered cables 1 extending in the left-right direction and the up-down 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, which is a member interposed and attached between the two, is recessed on one side, and further, the outer cover in the middle clamp structure of the other side. The stepped semi-circular groove 12b formed by forming both ends of the pipe 4 and the semi-outer peripheral portion of the covered cable 1 contacting both sides of the tube 4 with a smaller diameter than the intermediate portion is different from the stepped semi-circular groove 12a. They are orthogonally arranged and are recessed on the opposite side.

The third saddle member 11 is a member for attaching to the other intermediate clamp structure provided on the covered cable 1 extending in the vertical direction in FIG. 2, and is on the opposite surface of the second saddle member 10. A stepped semicircular groove 12b having the same shape as that provided on the side is recessed on one side.

First to third saddle members 9, 10, 11
As shown in FIG. 2 (C), the bolts are inserted into the intersections of the two intermediate clamp structures in a triple-layered state. Through holes 14 for each of the holes are formed, and after the four joining bolts 13 are inserted into the through holes 14,
By tightening with the nut 15, the saddle members 9, 10, 11 are fastened together, so that two intersecting intermediate clamp structures can be surrounded in a watertight manner.

In this way, when the intersections of the intermediate clamp structures are fastened by the cross fittings 7, the crimping force between the intermediate clamp structure and the coated cable 1 antagonizes the sliding force generated at the intersections. It becomes possible to maintain the fastening of the intersection until either the intermediate clamp structure slides with respect to the coated cable 1 or the cross fitting 7 is pressed against the intermediate clamp structure and ruptures. For this reason, the tightening force of the bolt required for the friction welding method by tightening the bolt is not necessary, and the tightening force only for joining the cross fittings is sufficient. The axial force control of the bolt is reduced and the installation work efficiency is improved. To rise. Similarly, the size of the cross fitting required for the friction joining method can be reduced by adopting the cross fitting 7 according to the present embodiment.

FIG. 3 is a front view in (A) and a side view in (B) of a connecting metal fitting 8 as an intermediate clamp metal fitting of a coated cable according to a third embodiment of the present invention. Each is shown and is also shown in plan view in (C). The connecting fitting 8 is a metal fitting made of steel, stainless steel, aluminum alloy, or the like, and is formed in a symmetrical shape so that the intermediate clamp structure of the coated cable 1 can be clamped from both sides and joined in a palm shape. A pair of band members 16 and 1
It consists of 6.

At both ends 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-outer peripheral parts of the covered cable 1 contacting both sides thereof. A stepped semi-circular groove 12c formed by forming a portion having a smaller diameter than that of an intermediate portion is provided as a recess, and further, through holes for inserting bolts at a plurality of locations corresponding to each other in a joined state, for example, four locations. Each of the band members 16 and 16 is fastened together by inserting four connecting bolts 17 into each through hole 18 and then tightening the nuts 19 with each other to thereby integrally fasten the band members 16 and 16. The clamp structure can be clamped in a watertight manner.

The connecting fitting 8 is further provided with a cable connecting means 20 for branching and connecting another cable. The cable connecting means 20 is, for example, both band members 1 which face each other with a space interposed.
A pair of band members is formed by a through hole 23 formed coaxially at each end of 6 and 16, a pin 21 inserted through both through holes 23, and a nut 22 screwed into the pin 21. It is provided so as to extend between 16 and 16.

In such a connecting fitting 8, both band members 16 and 16 are integrally fastened with a joining bolt 17 and a nut 19 so as to be sandwiched by an intermediate clamp structure, and a cable eye portion 25 is provided at an end portion. By inserting the cable eye portion 25 of the formed cable 24 into the space portion 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 connecting fitting 8 is the same as that described for the cross fitting 7, and therefore the description thereof is omitted.

[0032]

The present invention is carried out in the form as described above, and has the following effects.

That is, according to the present invention, it is possible to easily and reliably form an intermediate clamp structure having an anticorrosion property for a coated cable used as a supporting structural member in a suspension structure, a membrane structure building, a suspension bridge or the like. In addition, it is possible to simplify and downsize the cross fittings and connecting fittings for the coated cable, which can improve the installation workability and fastening property at the site of the coated cable installation, as well as the covered cable installation. The reliability and economic efficiency of the construction can be significantly improved.

[Brief description of drawings]

FIG. 1A is a vertical cross-sectional view of an intermediate clamp structure of a coated cable according to a first embodiment of the present invention before processing, and FIG. 1B is a perspective view of the same after processing.

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

3A is a front view of a middle clamp metal fitting of a coated cable according to a third embodiment of the present invention, FIG. 3B is a side view of the same, and FIG. 3C is a plan view of the same.

FIG. 4A is a vertical cross-sectional view of a first example of a conventional intermediate portion clamp structure for a coated cable, and FIG. 4B is a vertical cross-sectional view of the second example.

[Explanation of symbols]

1 ... Coated cable 2 ... Bare wire core 3 ...
Coated end portion 4 ... Jacket tube 4a ... Both end portions 4b ...
Intermediate part 5 ... Uneven surface 6 ... Spacer 7 ...
Cross metal fitting 8 ... Metal fitting 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 bolt 18… Through hole 19… Nut 20
... cable connecting means 21 ... pin 22 ... nut 23
… Through hole 24… Cable 25… Cable eye part 26
... Cylindrical tube

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) E01D 19/16 F16G 11/00 F16G 11/06

Claims (3)

(57) [Claims] 1. A bare wire core portion is formed by stripping a coating at a position of an intermediate portion of the covered cable, and the bare cable core portion is fittable to the covered cable and corresponds to the coated end portions in contact with both sides thereof. Consisting of a metal cylindrical tube of the above length, the inner diameters of both end portions which are the portions surrounding both coated end portions are smaller than the inner diameter of the intermediate portion which is the portion surrounding the bare wire core portion, and While fitting the jacket pipe formed by forming the inner surface of the intermediate portion into the uneven surface around the bare wire core portion and both coated terminal portions, in the gap existing between this jacket tube and the bare wire core portion, A coated cable characterized in that after a spacer made of a vertical split tube made of a material having a hardness lower than that of the jacket pipe is inserted, the jacket pipe is fixed to the bare wire core portion and both coated end portions by a press. The middle clamp structure. 2. A cross fitting provided in such a manner that two of the intermediate clamp structures of the covered cable having the structure according to claim 1 are surrounded by each other, and a jacket pipe in one of the intermediate clamp structures and a jacket pipe thereof. A first saddle provided with stepped semi-circular grooves formed so that both end portions for inserting a semi-outer peripheral portion of a covered cable in contact with both sides have a smaller diameter than an 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 on one side, and for inserting the outer tube of the other middle clamp structure and the semi-outer peripheral part of the covered cable in contact with both sides thereof A stepped semi-circular groove formed on both sides of each of the two end portions of the intermediate portion with a diameter smaller than that of the intermediate portion, and a second saddle member interposed between and attached to both intermediate portion clamp structures; 2 Opposite side of saddle member A stepped semi-circular groove of the same shape as the one on the side to attach to the other middle clamp structure
An intermediate portion clamp metal fitting for a covered cable, comprising: a saddle member and a plurality of joining bolts that are inserted through the joined first to third saddle members and fasten the saddle members together. 3. A connecting metal fitting, which is provided so as to be surrounded by an intermediate clamp structure of a covered cable having a structure according to claim 1, and which has a jacket tube in the intermediate clamp structure and a semi-outer circumference of the covered cable in contact with both sides thereof. A stepped semi-circular groove is formed in which both end portions for inserting the portion are formed with a diameter smaller than that of the intermediate portion, and the stepped half-round groove is formed symmetrically so as to sandwich the intermediate portion clamp structure and join in a palm-like shape. A pair of band members,
A plurality of joining bolts that are inserted into the pair of joined band members to fasten both band members together and a plurality of joining bolts for branching and connecting another cable are provided between the pair of band members. An intermediate clamp metal fitting for a covered cable, comprising: a cable connecting means.