JP3747163B2 - Rope clamp bracket for suspended structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rope clamp fitting for a suspended structure, and more particularly to a bracket for fixing a suspended rope in a suspended structure using a cable as a supporting member to the cable.
[0002]
[Prior art]
A suspension structure constructed by suspending other objects via a suspension rope (hanger rope) on a hollow main rope (cable). For example, in a suspension bridge, both ends of anchor ropes are fixed to anchorage. Is mounted on the main tower and fixed so that the suspension rope does not slide at predetermined intervals of the main rope, and the dead load of the bridge body (stiffening girder) and the activity loaded on the stiffening girder by these suspension ropes The load is transmitted to the main rope.
[0003]
As a means for fixing the suspension rope as described above to the main rope, clamp fittings are widely used. Conventional clamp fittings generally have a deformed rectangular shape when viewed from the front as shown in FIGS. The two plates 100 and 100 were combined with a rope end fitting 101 in which the end of the suspension rope 2 was fixed and a ring portion (eye) 102 was provided on the head.
[0004]
The plates 100, 100 have a fitting groove 103 corresponding to the main rope 1. Each of the upper and lower portions of the fitting groove 103 has several bolt insertion holes, and is located in a lower side area than the bolt insertion holes. Has extension plate portions 100 ', 100'. The extension plate portions 100 ′ and 100 ′ are provided with expanded bent portions for obtaining a free space 104 for receiving the ring portion 102 of the cable end fitting 101, and arc-shaped elongated holes in the expanded bent portions. 105 and 105 were provided.
[0005]
In this prior art clamping work, the main rope 1 is sandwiched from the left and right by the two plates 100, 100, the bolts 107 passed through the respective bolt insertion holes are tightened with the nuts 108, and the rope end fitting 101 inserted into the free space is clamped. A pin bolt 106 that passes through the arc-shaped elongated holes 105, 105 is passed through the ring portion 102, and a nut 109 is screwed together and is also loosened with a split pin 110.
[0006]
[Problems to be solved by the invention]
However, although this prior art makes it possible to change the suspension angle with the arc-shaped long holes 105 and 105 so that the suspension cable 2 can correspond to the main cable 1, the ring portion 102 of the cable end fitting 101 is large. Therefore, the arc-shaped long hole 105 is provided at a position separated from the main cord core by about 130 mm. For this reason, it becomes a large and heavy clamp fitting as a whole, and this specification is almost the same even if the main rope thickness is relatively small, so the clamp fitting becomes unnecessarily large for small suspension bridges, etc. The balance was unbalanced and the landscape could be damaged. In addition, since the weight of the clamp fittings fixed to the main ropes becomes heavy, there is a problem that the weight reduction of the suspension bridge is hindered.
[0007]
Further, since the pin bolt 106, the nut 109, the split pin 110, and the like are used as the connecting elements of the cable end fitting 101 to the plates 100, 100, the number of parts as a whole increases. You have to carry to the main rope position mounted at a high place and perform operations such as tightening a large number of bolts and expanding the split pins. For this reason, it takes time and effort for fixing, and since this is accumulated in a large number of construction sites, work efficiency and workability are lowered, and there is anxiety in terms of safety.
In addition, since the plates 100 and 100 are large and a large number of parts such as pin bolts, nuts, and split pins are required, there is a problem of high cost.
[0008]
The present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is to be lightweight and compact when used while having the ability to displace the end fitting according to the angle of the main rope. A highly practical rope clamp fitting for suspended structures that can make the appearance of the machine smarter, can be clamped easily, quickly, and reliably, and can reduce the number of parts and cost. It is to provide.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the rope clamp fitting for a suspended structure according to the present invention is a rope clamp fitting in a suspended structure constructed by suspending another object via a suspended rope on a main rope mounted in a hollow space. In the above, a metal fitting body consisting of a split part body having a fitting groove with respect to the main rope and having bolt insertion holes in the vicinity thereof, and a circular shape extending perpendicularly to the axis at the top of the cylinder part fixing the suspension rope end It consists of a combination with a T-bar-shaped end fitting having a cross-section shaft portion, and the two split parts are arranged on the alignment surface between the left and right bolt insertion holes. A support hole having a circular cross-section for fitting the upper end and a guide groove for permitting the displacement of the cable end fitting with the upper end leading to the support hole, and the guide groove is formed with a T-bar when the two split parts are combined. It has a depth to accommodate the cylindrical part of the cable end fitting, and the width expands in a fan shape to divide into two parts It is characterized in that it reaches the lower edge.
[0010]
Preferably, the support hole into which the shaft portion of the T-bar cable end fitting is fitted is a bag hole located in the vicinity of the fitting groove.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 (a) and 1 (b) show an example of use of a suspension bridge rope clamp fitting according to the present invention, wherein 1 is a main rope, 2 is a rope clamp fitting according to the present invention, and comprises a bracket body 4 and a suspension rope 5. The main rope 1 is attached at predetermined intervals. A bridge body 3 is connected to the suspension cable 5. In addition, the main rope 1 is not necessarily limited to one, but may be a plurality.
[0012]
2 to 7 show an embodiment of the rope clamp fitting according to the present invention.
First, the suspension cable 5 is made of a rope having a required diameter, and a T-bar cable end fitting 6 is fixed to the upper end.
The T-bar-shaped end fitting 6 integrally has relatively short shaft portions 61 and 61 extending in a direction perpendicular to the tube portion axial direction at the top of the tube portion 60 into which the suspended rope end portion 50 is inserted and fixed. . The shaft portions 61 and 61 have a circular cross section perpendicular to the axis so that they can function as hinges.
In addition, the fixing method with respect to the cylinder part 60 of the suspension rope end part 50 is arbitrary, and although compression from the radial direction by a forge type is simple, it is not restricted to this.
[0013]
The metal fitting body 4 is composed of a pair of two split parts 4a and 4a in the form of a horizontally long block. The inner surface of the two split parts 4a and 4a has a central portion in the width direction as shown in FIG. A fitting groove 40 for holding the main rope 1 is formed, and when the two split parts 4a, 4a are opposed to each other and are fastened with bolts 7 and nuts 8, the fitting grooves 40, 40 is in close contact with the main rope 1.
[0014]
Two left and right bolt insertion holes 41, 41 'are provided in the upper and lower portions across the fitting groove 40, and the bolt heads are formed on the outer surface portions corresponding to these bolt insertion holes 41, 41'. And seated recesses 42 and 42 'for mounting nuts, and the side surfaces of the split parts 4a and 4a including the seated recesses 42 and 42' are flat for light weight and easy handling. Surfaces 45, 45 are formed.
[0015]
Further, in the middle part of the lower bolt insertion holes 41 ′ and 41 ′, that is, in the longitudinal central portion of each of the two split parts 4 a and 4 a, the split part body thickness is located at a position close to the fitting groove 40. Support holes 43 extending in the vertical direction are respectively formed.
The support holes 43 and 43 are for rotatably supporting the shaft portions 61 and 61 of the T-bar cable end fitting 6 and have a circular cross section perpendicular to the axial direction.
[0016]
Further, a guide groove 44 is formed on the inlet side of the support hole 43, that is, on the inner surface of the split part body 4a. The guide groove 44 opens at the lower edge of the split part body 4a. The guide grooves 44 and 44 have a depth h sufficient to form a hole for receiving the cylindrical portion 60 of the T-bar cable end fitting 6 when the two split portions 4a and 4a are combined. Moreover, as shown in FIGS. 4 and 6, the guide grooves 44 and 44 have side walls 440 and 440 that expand in a fan shape or a taper shape toward the lower edge of the split part body 4a when viewed from the front. is doing.
[0017]
What is shown is an example of the present invention, and various modes can be adopted.
Although the two split parts 4a and 4a of the metal fitting body 4 may be made by cutting, they may be made by casting. Usually, it is made of an iron-based material, but in some cases, it may be made of FRP or the like.
The shape of the two split parts 4a, 4a is arbitrary, and the cross section perpendicular to the longitudinal direction is split as shown in FIG. 8, and is oval or oval when viewed from the front. It may have a ball-like appearance.
[0018]
The support holes 43 and 43 are preferably bag holes, but at least one of the support holes 43 and 43 may be open to the outer surface of the split portion 4a, so that a rust preventive agent such as grease can be easily provided during maintenance. Can be injected.
The fitting grooves 40, 40 may be fitted with a half-bush if necessary so as to correspond to the non-slip and several types of main ropes.
Although the suspension rope 5 is basically a wire rope, it may be made of a highly elastic high strength fiber.
[0019]
[Effect of the embodiment]
The usage and operation of the suspension clamp fitting according to the present invention will be described. As necessary members, the suspension rope 5 and the four bolts fixed with the split parts 4a and 4a and the T-bar rope end fitting 6 shown in FIG. It is only necessary to prepare as many nuts 8 as seven. For example, when the main rope diameter and suspension rope diameter are compared with the conventional ones of FIGS. 11 and 12 under the same conditions, the size (area) of the metal fitting body 4 is 50% or less and the total weight including necessary parts is 70%. % Or less. Since four types and seven parts are sufficient, it is easy to carry to the main rope 1 mounted at a high place.
[0020]
When connecting the suspension cable 5 to the main cable 1, the bolts 7, 7 are inserted into the bolt insertion holes 41, 41 on the upper side of the two split parts 4a, 4a as shown in FIG. 8 is lightly screwed and connected so that the two split parts 4a and 4a are not separated. In this state, the metal fitting main body 4 is straddled on the suspension rope attachment planned site marked on the main rope 1.
[0021]
Next, as shown in FIG. 9 (a), the T-bar cable end fitting 6 is inserted into the guide grooves 44, 44 of the two split parts 4a, 4a in a state where the split parts 4a, 4a are expanded. insert. In this way, the shaft portions 61, 61 at the upper end of the T-bar-shaped end piece 6 enter along the side walls 440, 440 of the guide grooves 44, 44, and as shown in FIG. Fits in 43.
After that, the bolt assembly temporarily fixed in the upper bolt insertion holes 41, 41 is finally tightened, the bolts 7, 7 are inserted into the lower bolt insertion holes 41 ', 41', and the nuts 8, 8 are inserted. Can be screwed and tightened to complete the operation.
[0022]
The present invention does not require any parts such as pin bolts, nuts, and split pins for connecting the suspension cable 5 to the metal fitting body 4, and accordingly, the ring portion of the cable end metal fitting is inserted between the pair of plates, and the arcuate hole There is no need for complicated operations such as the operation of penetrating the pin bolt through the ring hole of the cable end fitting, the operation of screwing the nut into the pin bolt, the insertion of the split pin near the tip of the pin bolt, and the expansion of the tip.
That is, the T bar-shaped cable end fitting 6 is simply supported by the metal fitting body 4 simply by inserting it from the bottom of the two split parts 4a, 4a and fitting the shaft parts 61, 61 into the support holes 43, 43. Therefore, the operation can be performed very simply and quickly, and a large number of metal fittings 4 can be connected efficiently.
[0023]
In the suspension bridge completed as described above, the metal fitting body 4 is compact and slender horizontally long as shown in FIGS. 1B, 2 and 3, and bolts, nuts and the like do not protrude from the outer surface. Moreover, the connecting portion of the suspension cable 5 does not appear on the surface of the metal fitting body 4, and there are no pins or nuts for supporting this. Therefore, it is very smart and beautiful in appearance, and can be made to have an excellent landscape as a suspension bridge in sightseeing spots.
[0024]
Even in use, since the T-bar rope end fitting 6 is supported at a position very close to the main rope 1, an unreasonable bending moment does not act, and the shaft portions 61, 61 and the support holes 43, 43 are not affected. Thus, the suspension cable 5 can be reliably suspended and the load from the bridge body 3 can be stably transmitted to the main cable 1.
[0025]
Further, since the guide grooves 44 and 44 fitted with the cylindrical portion 60 of the T-bar-shaped end fitting 6 are gradually expanded in a fan shape, the shaft portions 61 and 61 of the T-bar-shaped end fitting 6 are provided with support holes. 43, 43 can be rotated in the left-right direction (in the direction of the rope axis). Accordingly, by setting the taper angle of the guide grooves 44, 44 to an arbitrary angle (for example, 21 ° 48 ′), the cylindrical portion 60 of the T-bar-shaped end fitting 6 is connected to the side surfaces 440, 440 of the guide groove as shown in FIG. The entire suspension cable can be tilted as long as it comes into contact with the support cable 43, and the support holes 43 and 43 function as pivots. For this reason, as shown in FIG. 10, the suspension cable 5 can be automatically kept vertical according to the angle of the main cable 1, and the suspension cable 5 and the metal fitting body 4 are made vertical by applying an offset load to the bridge body 3. Even when the balance is not balanced, the suspension cable 5 can always be kept vertical.
[0026]
【The invention's effect】
According to the first aspect of the present invention described above, the cable end metal fitting is capable of being displaced according to the angle of the main rope 1 while being lightweight, compact and smart, and moreover, the suspension rope 5 with respect to the metal fitting body 4. An excellent effect is obtained that the connecting operation can be performed simply, quickly and surely, and the number of parts is small and the cost can be reduced.
[0027]
According to the second aspect, since the connecting portion of the cable end metal fitting to the metal fitting main body 4 does not appear outside, and there are no bolts and nuts for connection at all, an excellent effect of good appearance and smartness can be obtained.
[Brief description of the drawings]
1A is a partial perspective view of a suspension bridge to which a cable clamp fitting according to the present invention is applied, and FIG. 1B is a partially enlarged view thereof.
FIG. 2 is a front view of a cable clamp fitting according to the present invention.
FIG. 3 is a side view of a cable clamp fitting according to the present invention.
4 is a cross-sectional view taken along line XX of FIG.
5 is a cross-sectional view taken along line YY in FIG.
FIG. 6 is an exploded view of a cable clamp fitting according to the present invention.
7 is a cross-sectional view taken along line ZZ in FIG.
8A and 8B are cross-sectional views showing other embodiments of the rope clamp fitting of the present invention, respectively.
FIGS. 9A, 9B, and 9C are cross-sectional views showing step by step the operation of attaching the suspension cable of the cable clamp fitting according to the present invention.
FIG. 10 is a cross-sectional view showing an automatic angle adjustment state of the rope clamp fitting according to the present invention.
FIG. 11 is a front view of a conventional cable clamp for a suspension bridge.
FIG. 12 is a partially cutaway side view of a conventional suspension bridge rope clamp fitting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main rope 2 Cable clamp metal fitting 4 Metal fitting body 4a, 4a Split part body 43, 43 Support hole 44, 44 Guide groove 5 Suspension rope 6 T bar-shaped rope end metal fitting 60 Tube part 61, 61 Shaft part

Claims (2)

In a rope clamp fitting used in a suspended structure constructed by suspending another object via a suspension cable on a hollow main cable, it has a fitting groove 40 for the main cable 1 and its vicinity. Circular body shape that extends perpendicularly to the axis at the top of the metal fitting body 4 composed of two split parts 4a, 4a having bolt insertion holes 41, 41, 41 ', 41' on the upper and lower sides, and the cylindrical part 60 to which the suspension rope ends are fixed. It consists of a combination with a T-bar-shaped end fitting 6 having shaft sections 61, 61 in the cross section, and the split part bodies 4a, 4a are aligned surfaces between the left and right bolt insertion holes 41 ', 41'. Further, support holes 43 and 43 having a circular cross section for fitting the shaft portions 61 and 61 of the T-bar cable end fitting 6, and guide groove 44 and 44 for permitting the displacement of the cable end fitting with the upper end communicating with the support hole 43. The guide grooves 44, 44 are formed by combining the two split bodies 4a, 4a. The cylindrical portion 60 of the T-bar shaped ropes end fitting 6 has a depth of contents entry when it is, suspended structures, characterized in that the width has reached the two split portions body lower edge expanded in a fan shape Cable clamp bracket for use. The suspension structure rope clamp fitting according to claim 1, wherein the support hole 43 into which the shaft portion 61 of the T-bar rope end fitting 6 is fitted is a bag hole located in the vicinity of the fitting groove 40.

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