JP3059850U - Saddle for anchoring bridge girder reinforcement cable - Google Patents

Abstract

(57) [Summary] [Problem] Easy to manufacture and have high productivity, excellent in strength, rigidity, heat resistance, cold resistance, acid resistance and dimensional stability, realizing further weight reduction, construction work Provided is a saddle for fixing a bridge girder reinforced cable with improved performance. A semicircular guide groove (9) for holding an out cable with a stopper (10) is formed on the bottom surface of a saddle body (8) formed of a hexahedral phenolic resin laminate, and intersects with the main bridge girder on the upper surface of the saddle body (8). A mounting plate 11 for fixing to a crossbridge girder was fixed via a base plate 12.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a saddle for anchoring a bridge girder reinforcement cable of a viaduct.

[0002]

[Prior art]

 As shown in FIG. 5, a concrete viaduct for a highway or the like generally has a road surface 4 (paving board) on a concrete or steel main bridge girder 2 supported between piers 1 and a horizontal bridge girder 3 intersecting with the main bridge girder 2. ) Is formed.

[0003] When the main bridge girder 2 is made of steel, strength is maintained by its own rigidity. In the case of concrete, a piano wire is buried in concrete and tension is applied to the piano wire (inner cable). Prestressed concrete (PC concrete), which is strengthened by applying a force and applying a pre-compression stress, is used.

[0004] Each of the steel and PC concrete main bridge girders 2 maintains the required strength, but the design load of the bottom slab was changed from TL-20 to TL-25 in 1994, and the safety of aging change As shown in Fig. 5, an out cable 5 is stretched along the length of the main bridge girder 2 on the side of the main bridge girder 2 as shown in Fig. 5 and one end is anchored to the block 7 and the other end is deflected to the block 7. A reinforcing method is adopted in which a device (tensile device) is provided, and the out-cable 5 is tensioned to apply a pre-compression stress to the main bridge girder 2 of steel or PC concrete by a tensile force.

When the out cable 5 is stretched, a saddle 6 for guiding and holding the out cable 5 is fixed to the cross beam 3 so that the out cable 5 is pulled up between the piers 1.

The conventional saddle is a casting or an iron lump, and a guide groove for holding the outer cable 5 is molded or machined in the casting or the iron lump. Therefore, the conventional saddle weighs 40 to 50 kg, and there is a problem that the work of fixing the saddle to the crossbridge at a high place is not only heavy labor but also involves danger.

In order to solve the above-mentioned problem, the applicant of the present application has proposed a structure in which a reinforcing bar is provided in a metal box and a mortar is filled in the metal box. No. registered.

[0008]

[Problems to be solved by the invention]

 However, the saddle body disclosed in Utility Model Registration No. 3043915 requires the production of a metal box, the setting of reinforcing bars in the metal box, and the filling of mortar in the metal box. There are many difficulties in productivity, and the mortar filled in the metal box requires time to solidify and cannot be used immediately after manufacturing and processing.In addition, the structure of the metal box, reinforcing bars and mortar Although it is lighter than castings, it still has a considerable weight and is difficult to work.Therefore, it has been an issue to improve it, and as a result of trial and error, these problems Is completely eliminated.

[0009] The purpose of the present invention is to facilitate the manufacturing process, have a high productivity, and have excellent strength, rigidity, heat resistance, cold resistance, acid resistance and dimensional stability. An object of the present invention is to provide a saddle for fixing a bridge girder reinforcing cable with improved characteristics.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a saddle for anchoring a bridge girder reinforcing cable in which a concrete or steel main bridge girder supported between piers is tensioned with an out-cable to reinforce the bridge girder. A semicircular guide groove for holding the out-cable by a fastener is formed on the bottom surface of the saddle body composed of a hexahedron of a laminated plate, and is fixed to a cross bridge girder crossing the main bridge girder on the upper surface of the saddle body. A mounting plate is provided.

[0011]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to the drawings. 1 to 4, reference numeral 6 denotes a saddle according to the present invention. The saddle body 8 constituting the saddle 6 is formed of a hexahedron of a phenol resin laminate. The phenolic resin laminate is a plate (trade name: Bakelite) obtained by impregnating a cloth with a phenolic resin, stacking a required number of them, compressing and integrating them into a hexahedral block.

An out cable 5 is guided on the bottom surface of the saddle body 8, and a guide groove 9 to be held by a stopper 10 is formed. On the upper surface, an attachment for fixing the cross bridge girder 3 is provided. A plate 11 is provided.

The mounting plate 11 faces the base plate 12 fixed to the upper surface of the saddle body 8 with the countersunk bolts 13 at a predetermined interval corresponding to the width B of the horizontal bridge girder 3. An auxiliary bolt hole 14b is formed at a position separated from the main bolt hole 14a. The saddle 6 is firmly fixed to the cross beam 3 by the main bolt hole 14a and the sub bolt hole 14b.

The saddle 6 shown in FIGS. 1 to 4 has a structure for guiding and holding the horizontal portion of the out cable 5. That is, the guide groove 9 of the out cable 5 formed on the bottom surface of the saddle body 8 is formed in a horizontal straight line. The extension of the out cable 5 is not necessarily horizontal, and there are curved portions depending on the extension portion. In order to deal with such a portion, as shown in FIG. 4, the basic configuration is the same as that of FIGS. 1 to 4, but the bottom surface of the saddle body 8 formed of a hexahedron of a phenol resin laminate. The guide groove 9a of the out cable 5 having a curved line following the curved line is formed. Since the saddle 6a for the curved portion has a longer length in the longitudinal direction than the saddle 6 for the horizontal straight line, the base plate 12 fixed to the upper surface of the saddle body 8 becomes longer. It is desirable to use 13 and the hexagon bolt 13a together to secure the fixing strength.

In order to reduce frictional resistance when the out cable 5 is tightened, as shown in FIG. 3, a bottom resin processing 15b such as fluororesin is formed in the guide groove 9 (guide groove 9a in FIG. 4). Then, a resin tube 15a made of fluororesin or the like is held around the outer periphery of the out cable 5 and is held by the stopper 10 in the guide groove 9 (in FIG. 4, the guide groove 9a). The resin tube 15a (anti-friction resistance material) having a shape obtained by dividing the circumference into two parts is easy to handle when the outer circumference of the out cable 5 is held. The bottom resin processing 15b and the resin tube 15a of the guide groove 9 (in FIG. 4, the guide groove 9a) may be made of a slippery resin other than fluororesin.

In the present invention, as described above, the saddle body 8 constituting the saddle 6 is made of a hexahedron of a phenolic resin laminate, so that it is easy to manufacture and has high productivity, and has strength, rigidity, heat resistance, It is excellent in cold resistance, acid resistance and dimensional stability, realizes further weight reduction, facilitates the work of fixing the saddle 6 to the high cross bridge girder, and improves the workability of ensuring safety. This solves the problem of the saddle of a metal box filled with mortar with conventional reinforcing bars inside.

Further, the guide groove 9 (the guide groove 9a in FIG. 4) is formed by a bottom resin processing 15b made of fluororesin or the like and a resin tube 15a made of fluororesin or the like held on the outer periphery of the out cable 5. When the cable 5 is tensioned, the out-cable 5 held in the guide groove 9 (the guide groove 9a in FIG. 4) of the saddle body 8 has a reduced frictional resistance and a good slip can be obtained. Tensile force can be reliably applied.

It is to be noted that the saddle according to the present invention can be applied not only to a concrete viaduct on a highway but also to a concrete viaduct of a railway and other general concrete bridges.

[0019]

[Effect of the invention]

 As described above, according to the saddle for fixing the bridge girder reinforcing cable of the saddle body composed of the hexahedron of the phenolic resin laminate of the present invention, compared to the conventional metal box saddle in which reinforcing bars are provided and mortar is filled. It is easy to manufacture, has high productivity, and is excellent in strength, rigidity, heat resistance, cold resistance, acid resistance and dimensional stability. There is an advantage that the workability of the work is easy and safety is secured.

[Brief description of the drawings]

FIG. 1 is a side view of the present invention.

FIG. 2 is a bottom view of the present invention.

FIG. 3 is a front view of the present invention.

FIG. 4 is a side view showing a modification of the present invention.

FIG. 5 is a side view showing an implementation state of a saddle for fixing a bridge girder reinforcing cable.

[Description of Signs] 1 Bridge pier 2 Main bridge girder 3 Cross bridge girder 4 Road surface (paving board) 5 Out cable 6 Saddle 7 Block 8 Saddle body 9 Guide groove (horizontal) 9a Guide groove (curve) 10 Stopper 11 Mounting plate 12 Base plate 13 Main bolt hole 13a Secondary bolt hole 14a Resin tube 14b Bottom resin processing

Claims (1)

[Utility model registration claims] 1. A saddle for fixing a bridge girder reinforcement cable for reinforcing a concrete or steel main bridge girder supported between piers by applying tension with an out-cable, and comprising a hexahedron of a phenolic resin laminate. A semicircular guide groove for holding the out cable by a fastener is formed on a bottom surface of the saddle body, and an attaching plate for fixing the cross cable to the main bridge girder crossing the main bridge girder is provided on the upper surface of the saddle body. Characteristic saddle for fixing bridge girder reinforcement cable.