KR20020005817A - Guide structure used as elastic prop - Google Patents

Abstract

PURPOSE: Structure of a guide for an elastic strut is provided to produce a precise and compact product by removing a welding process. CONSTITUTION: A guide for an elastic strut comprises a lower plate(32) supported on anchor bolts(33) buried in the upper end of a pier(2) and constituted of protruded guides(34); an upper plate(31) supported on anchor bolts(33) buried in the lower end of an upper plate(1) and constituted of guides(34) face-to-face contacting with the guides of the lower plate; and pads(4) inserted in between the guides of the upper and lower plates. The guides are attached by bolts(35). When the bolts are connected, a rupture recessed groove is formed in the position where the upper and lower plates are in face-to-face contact with the guides. Therefore, interference between components is removed.

Description

Guide structure used as elastic prop}

The present invention relates to an elastic bearing installed on an upper portion of a pier supporting the upper plate of a bridge to receive loads and deformations of the upper plate, and more particularly, to improve the ability to cope with sudden displacement such as an earthquake by improving the conventional elastic bearing. It relates to a guide structure for elastic support.

Bridges that connect both eyes across the sea, as well as rivers and rivers, generally have a structure that raises a deck on a pier (the "shift" installed on both sides of the sea or river is also a type of "pier". Even if the cable-stayed bridge (suspension bridge) is installed without a pier, the structure supporting the upper plate (including both the pier or the pillar) is installed in the center or both sides, so basically it does not deviate from the structure of the upper plate and the pier. The heavy load of heavy bridges and trailers is increased, and the dynamic load changes every time.In particular, the bigger the bridge, the longer the top plate. Should be able to be changed to have sufficient load bearing capacity as a bridge Therefore able, in general, and to install, while the elastic support on the top of the pier corresponding to the displacement of the top board, supporting the top plate, so as to reduce the impact force on the upper plate.

Such an elastic bearing includes a port bearing using a bearing or an elastic bearing made of an oilless bearing type and a steel plate. The present invention is an improvement of the latter. Patent No. 206637 of "A bridge device for bridge (the bridge device is a collective name of the structure that functions between the top plate and the bridge, the elastic support of the present invention is one aspect of such a bridge device)", which is disassembled in FIG. As shown in the state and as shown in the cross-sectional view in Figure 6, the anchor bolt 33 embedded in the upper end of the pier (2) supports the four sides and one side of the upper surface of the bracket 34 ("Guide") protruding a certain height And a lower plate 32 formed by attaching a stopper 34 (which functions as a "guide") inserted into and fixed to the inside of the bracket 34, and embedded in the lower side of the upper plate 1). The anchor bolt 33 is supported and the upper plate 31 which is symmetrical with the lower plate 32, and the rubber 41 and the iron plate 42 is alternately stacked in a rectangular shape of the upper and lower plates 31, 32 In the elastic support composed of the pad 4 inserted between the bracket 34 and the stopper 35, the rubber 41 of the pad 4 is an elastic rubber 41 'having a 2.5 to 3.5 times strength of acupressure. And a plurality of lubrication grooves 44 in which fluorine resins (PTFE, 43) are laminated on the upper and lower surfaces or one surface of the pads 4 and grease 45 is injected to the surface thereof, and the fluorine resins 43 and The lubricating plate 36 of stainless steel is planted and constructed in the upper and lower plates 31 and 32 which face each other by the magnitude | size larger than the specification of the said pad 4 more than displacement.

In the conventional invention configured as described above the upper plate 31 is moved integrally with the upper plate 1 by the anchor bolt 33, the lower plate 32 is fixed integrally with the piers (2), the upper plate (1) The displacement of the upper plate 1 by the stretching and contraction while transferring the load of the upper plate 1 to the piers 2 through the pad 4 is limited to the movement between the bracket 34 and the stopper 34 and the guide 34 and the stopper 35. Or by guiding, and in particular, the fluororesin 43 and the lubrication plate 36 in contact with the fluororesin 43 and the fluorine resin 43 in contact with the fluororesin 43 are smoothly moved. Therefore, since the conventional invention has no shear deformation, there is no peeling phenomenon of the pad 4 laminated with the rubber 41 and the iron plate 42, and the entire elastic support can be reduced as the pad 4 becomes smaller. In addition to improving economics due to material savings, the pad 4 can be easily taken out. There are also replacement and maintenance convenience.

However, in the related art, the guide (bracket) is attached to the upper and lower plates so that the movement in a predetermined direction is limited and only the movement in the required direction is possible. Since the welding beads are inevitably formed because they are attached by welding, they have a predetermined distance between the upper and lower guides so that they can be moved and accommodate the torsion between the guides by interference with the beads or thermal deformation during welding. In this way, the spacing to be placed between the guides is not only economical by making the size of the elastic bearing larger than necessary, but also causes problems such as inadequate guidance between modified guides.

The present invention has been researched and developed in order to solve the above problems, the present invention provides a structure that can be made easily and precisely the production of the elastic bearing to provide a good quality product, so that welding is unnecessary during manufacturing By providing a structure to solve the problem of the interference between accessories due to heat deformation or welding bead to provide a precise and compact product, which is a conventional elastic support, the guide portion is gathered by bolts It consists of a structure, which will be described in more detail according to the drawings as follows.

1 is a configuration diagram of the elastic support of the present invention,

2 is an enlarged cross-sectional view taken along the line A-A of FIG.

3 is an enlarged action state of the excerpt B of Figure 2,

4 is a cross-sectional view of the installation state of the present invention;

5 is an exploded state diagram of a conventional invention;

6 is a cross-sectional view of an installation state of the related art.

* Explanation of symbols for main parts of the drawings

1 --- tops

2 --- Pier

3 --- elastic support

31 --- Top plate 311 --- Bolted

32 --- Bottom plate 33 --- Anchor bolt

34 --- Guide 341 --- Threaders

34 '--- weld 35 --- bolt

351 --- Breaking groove 36 --- Lubrication plate

4 --- pad

41 --- Rubber 41 '--- Elastic Rubber

42 --- Iron plate 43 --- Fluororesin

44 --- Lubrication groove 45 --- Grease

Figure 1 is a configuration diagram of the elastic support of the present invention, Figure 2 is an enlarged cross-sectional view taken along the line A-A of Figure 1, Figure 3 is an enlarged view to show the action state by extracting only the portion B of FIG.

In the present invention, as shown in the drawings, the anchor bolt 33 embedded in the upper end of the pier (2) supports the four sides and the lower plate 32 is formed by attaching the guide 34 protruding a certain height on both sides of the upper surface And, the anchor bolt 33 is buried in the upper plate (1) is supported and the guide 34 to be interviewed with the guide 34 attached to the lower plate 32 facing the lower plate 32 is attached The upper plate 31 to be formed, and the rubber 41 and the iron plate 42 are laminated alternately and consists of a pad (4) inserted between the guides (34, 34) of the upper and lower plates (31, 32) In the elastic bearing, guides 34 attached to the upper and lower plates 31 and 32 are attached by bolts 35, and when the bolts 35 are fastened, the guides 34 and 32 are attached to the upper and lower plates 31 and 32, respectively. Under a displacement with an acceleration of a = 0.079 to 0.15 g at the position interviewed between the guides 34 and 34 It characterized in that the rupture groove 351 is formed to be two.

4 is a configuration diagram of the present invention, the operation of each part with reference to this.

In the present invention configured as described above, the action between the upper and lower plates 31 and 32 and the pad is the same as the conventional invention, as shown in FIG. 3, and the upper plate 31 is formed by the anchor bolt 33. The lower plate 32 is integrally fixed to the pier 2 so that the lower plate 32 is integrally fixed to the pier 2 so as to transfer the load of the upper plate 1 to the pier 2 side through the pad 4. The displacement due to shrinkage is received by the pad 4. The pad 4 used here is made of rubber 41 or elastic rubber 41 'or a lubrication structure (as in the pre-registered invention of its own) (the fluorine resin 43 is laminated on the upper and lower surfaces of the pad 4). Lubricating groove 44 in which grease 45 is injected is formed on the surface, and any one of the structures in which the lubricating plate 36 is formed on the facing plates 31 and 32 may be adopted. Since it is inserted into the inner space formed by the guides 34 and 34 of the 31 and 32, it can be comprised not only rectangular but also any shape, such as a circle, a triangle, and a pentagon, depending on these shapes.

The guides 34 attached to both sides of the upper plate 31 and the guides 34 attached to both sides of the lower plate 32 are to be interviewed with each other, for example, a guide attached to the left side of the upper plate 31. If the 34 is on the outer side of the guide 34 attached to the left side of the lower plate 32, the opposite side should be the same on the right side to exert an excessive force on the side of the pad 4 located between the plates 31 and 32. It won't let you.

In addition, the present invention particularly specifies that the guides 34 respectively attached to the upper and lower plates 31 and 32 are attached by the bolts 35. In this way, the bolts 35 are fastened by the conventional welding method. In order to obtain better quality, the gap between the guide 34 and the guide 34 should be 5 mm or more in order to prevent the twist caused by the welding bead 34 'and the heat deformation, which is the guide 34 and the pad 4. The same is true for the liver, so, for example, in the case of the elastic support supporting the 135 Ton load, the conventional invention was 550mm × 580mm × 38mm (L × W × H), but the elastic support of the present invention was 550mm × 482mm × 38mm. 98mm shortening effect could be obtained.

In addition, when the bolt 35 is fastened, the breaking groove is broken under a displacement having an acceleration of a = 0.079 to 0.15 g at the position interviewed between the upper and lower plates 31 and 32 and the guides 34 and 34. 351 is formed, which is that when an earthquake occurs, the increased load due to the earthquake acts mainly as a horizontal load (in the direction of arrow P in FIG. 3), which is a sudden displacement, for example, the guide 34 in which the direction is installed. In the case of acting in a direction perpendicular to the same (similar in the same direction) in the conventional guide 34 is so firmly attached that the guide 34 acts as a total resistance to the horizontal displacement is subjected to vibration as it is, pier (2 The sudden vibration is transmitted to the c) side as it is, and the pier 2 is exerted by the high frequency. However, even in this case, since the elastic support of the present invention has a contact surface between the plates 31 and 32 and the guide 34 at the fracture recess 351 side, the shear deformation force is intensively acted upon and fractured at this {FIG. When the force in the direction of the arrow P is applied, a resistance force in the direction of the arrow R is generated, so that the bolt 5 is broken} The pad 4 functions, which causes the frequency to be reduced by the shear deformation of the pad 4. 2) You can alleviate the group that can affect.

In addition, the bolt 35 is limited to break only under a predetermined acceleration. For example, it is preferable to break at a = 0.07g (g is gravitational acceleration) in a class 2 bridge and a = 0.15g in a class 1 bridge. Ie the horizontal load H is

Equation 1] H = Cc × W (Cc is the seismic response coefficient, W is the dead weight of the bridge)

Where Cc is

Equation 2] Cc = 1.2AS / T ^2/3 (A is the acceleration coefficient, S is the ground coefficient, T is the natural period)

Therefore, the horizontal load H is proportional to Cc, and Cc is proportional to A again. Therefore, if the horizontal load due to the earthquake is proportional to A and inversely proportional to T and destroyed at a specified acceleration, then the vibration period T of the bridge

Equation 3] T = 1 / f (f is the frequency, which is the number of reciprocations)

Therefore, when the bolt 35 is broken, the period is lengthened by the pad 4 of the elastic support, which allows a small momentum to be applied to protect each part of the bridge.

And, as shown in the present invention, the guides (34, 34) attached to the plates (31, 32) with bolts (35), and the interference with other components after the attachment (because there is no bead by welding) In order to provide a structure to exclude, each of the upper and lower plates 31 and 32 is bored with a bolt hole 311 having a long diameter and a short diameter from the outside to the pad 4 side, the bolt hole ( It is a natural configuration that the screw hole 341 formed with a spiral is formed in a portion that is in contact with the 311, and the bolt 35 is fastened from the bolt hole 311 to the screw hole 341. Accordingly, the bolt 35 is inserted into the bolt hole 311 having a long diameter and a short diameter, and the short diameter is slightly larger than the outer circumference of the bolt 35 so as not to interfere with the rotation of the bolt 35 for fastening. The long diameter portion is inserted into the head of the bolt (35) is a standard that is rotated with a tool such as a box, etc. Of course, if the hexagonal grooves, etc. are formed in the bolt (35) head to be fastened as a hex wrench The size of the diameter can be further reduced, and the depth of the long diameter must be at least deeper than the length of the head of the bolt 35 so that the head of the bolt 35 does not protrude above the plates 31 and 32 to prevent interference with other parts. Of course, the screw hole 341 formed in the guide 34 should be of a standard that is screwed with the spiral of the bolt (35).

As described above, the present invention has a structure that can be made easily and precisely the production of the elastic support, and because the structure does not require welding at the time of manufacturing, the problem of interference between accessories due to heat deformation or welding bead source It is an effective and useful invention because it can solve the problem and provide a precise and compact product.

Claims (1)

Anchor bolts 33 embedded in the upper ends of the piers 2 support the four sides, and lower plates 32 formed by attaching guides 34 protruding a predetermined height are attached to both sides of the upper surface, and embedded in the lower end of the upper plate 1. An upper plate 31 supported by an anchor bolt 33 and facing the lower plate 32 is attached to a guide 34 attached to the lower plate 32 and interviewed with a guide 34. In the elastic support composed of a pad (4) and the iron plate 42 is alternately stacked and inserted between the guides (34, 34) of the upper and lower plates (31, 32), Guides 34 attached to the upper and lower plates 31 and 32 are attached by bolts 35 and the upper and lower plates 31 and 32 and guides 34 and 34 when the bolts 35 are fastened. ) A guide structure for elastic support, characterized in that the fracture recess groove 351 is formed to be broken under a displacement having an acceleration of a = 0.079 to 0.15g at positions interviewed between.