JP2007270471A - Bridge fall preventing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bridge fall preventing structure showing high absorbing capacity to tensile force caused by the dislocation of a bridge girder in case of a big earthquake by largely increasing the amount of elongation to tensile force in the bridge fall preventing structure connecting a bridge pier and the end of the bridge girder by the connecting member to prevent the fall of a bridge. <P>SOLUTION: In the bridge fall preventing structure connecting the bridge pier 1 and the end of the bridge girder 2 by the connecting member to prevent the fall of the bridge, the connecting member is formed of a braided strip material 9 with extensibility imparted by braiding fiber. The braided strip material 9 is formed in a composite structure having both extensibility by its braided structure and compressive elasticity of a core material or granular material. Both the extensibility and the compressive elasticity act in association with each other to induce the proper extension of the material to the initial tension so that the absorbing capacity can be developed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fall-off prevention structure, and more particularly to a fall-off prevention structure in which a bridge pier and a bridge girder end are connected by a connecting material to prevent a fall bridge.

  As shown in FIG. 1, the bridge pier (including the abutment) 1 and the end of the bridge girder 2 are connected by a connecting chain 3 so that the bridge girder 2 is dropped from the pier 1 due to an earthquake or the like so as to prevent the so-called falling bridge. The falling bridge prevention structure is widely used.

  One end of the connecting chain 3 is connected to the upper part of the bridge pier 1 via a bracket 5 attached with an anchor bolt 4, and the other end is similarly attached to the end of a bridge girder 2 supported by the bridge pier 1 with an anchor bolt 4. Are connected via the bracket 5 and further provided with play 8 between the chain rings 6 constituting the connecting chain 3 so as to be relaxed in part length, and the relaxed part is molded 7 with a rubber material, that is, inside the rubber material. The buffer coupling chain 3 is used in which the slack portion of the chain 3 is embedded to provide elongation with respect to the tensile force and absorb the tensile force.

  However, the connecting chain 3 basically has a rigid structure with respect to a tensile force. When a strong initial tensile force is applied due to an earthquake, the anchor bolt 4 used in the connecting portion jumps or the chain ring 6 opens. It has the problem of breaking and losing its function.

  Further, the amount of relaxation, that is, the amount of elongation of the chain ring 6 in the molding 7 provided to compensate for this, is extremely limited, and the fear of tearing has not been eliminated.

  Further, there is a problem in that the elongation of the chain ring 6 at the relaxed portion causes a separation at the bonding interface with the molding 7, or the molding 7 is deteriorated with age and cracks and elasticity are reduced.

  In addition, the buffer connection chain 3 used to prevent the falling bridge is very expensive at present, and a large number of connection chains 3 must be used for one bridge 2, so that the whole construction cost increases. Have.

  The first invention eliminates the connecting chain used as a connecting material for connecting the bridge pier and the bridge girder end, and connects the bridge pier and the bridge girder end with a connecting material to prevent the falling bridge. In the fallen bridge prevention structure, a structure in which the connecting material is formed of a braided strip that is braided with fibers to give stretchability, the braided strip is formed into a tubular structure, and a core material having compression elasticity is inserted into the lumen. In addition, the cooperation of the braided structure of the braided strip and the core material having compression elasticity ensures a sufficient amount of elongation that is difficult to obtain with conventional connecting chains, and provides a bridge-preventing structure that exhibits a high absorption capacity for tensile force. To do.

  According to a second aspect of the present invention, the connecting material is formed of a braided strip that is braided with fibers to give stretchability, the braided strip is formed into a tubular structure, and a large number of granular materials having compression elasticity in the lumen are formed. With the inserted structure and the cooperation of the braided structure of the braided strip and a large number of granular materials having compression elasticity, a sufficient amount of elongation that is difficult to obtain with a conventional connecting chain is secured, and a high absorption capacity for tensile force is exhibited. It provides a structure to prevent a falling bridge.

  According to a third aspect of the present invention, the connecting material is formed of a braided strip material that has been braided with fibers to impart stretchability, and has a structure in which a large number of granular materials having compression elasticity are knitted into the braided strip material, By collaborating with the braided structure of the braided strip material and a large number of granular materials having compression elasticity, a sufficient amount of elongation that is difficult to obtain with a conventional connecting chain is secured, and a fall-off prevention structure that exhibits a high absorption capacity for tensile force is provided. Is.

  According to a fourth aspect of the present invention, the connecting material is formed of a braided strip material that is formed by braiding a chemical fiber or a natural fiber and a fiber having compression elasticity to give stretchability. By cooperating with the fibers possessed, the present invention provides a structure for preventing a falling bridge that secures a sufficient amount of elongation that is difficult to obtain with a conventional connecting chain and exhibits a high absorption capacity for tensile force.

  A protective tube can be extrapolated to each braided strip.

  According to the present invention, in the falling bridge prevention structure in which the bridge pier and the bridge girder end are connected by the connecting material to prevent the falling bridge, the amount of elongation with respect to the tensile force is greatly increased by making the connecting material a braided structure. In addition, the braided strip material is compressed when a tensile force is applied when it is pulled, and stores the repulsive force. The rubber particles having compression elasticity and the concentric material cooperate with each other, resulting from a shift in the bridge girder during a large earthquake. It is possible to provide a structure for preventing a falling bridge that exhibits a high absorption capacity with respect to a tensile force.

  Innumerable fiber bundling, that is, a braided structure, can significantly increase the tensile strength of the connecting material, as well as prevent deterioration over time as much as possible, and maintain a healthy function of preventing a falling bridge.

  In addition, the above braiding strip material can be obtained at low cost by applying a braiding technique commonly used in the textile industry, and the overall labor cost in the construction work for preventing the falling bridge can be significantly reduced.

  The best mode for carrying out the present invention will be described with reference to FIGS.

  The present invention eliminates the conventional connecting chain 3 that is frequently used as a connecting material for connecting the bridge pier (including abutment) 1 and the two ends of the bridge girder, and makes the connecting material a braided structure. It is formed by a braided strip material 9 which is braided and imparted with elasticity, and by the cooperation of the braided structure of the braided strip material 9 and the core material, the same grain material, and the same fiber having the compression elasticity used in combination therewith, It is intended to provide an anti-falling bridge prevention structure that secures an amount of elongation that is difficult to obtain with the connecting chain 3 and exhibits a high absorption capacity for the tensile force.

  Hereinafter, a specific example of a composite structure of the braided strip material 9 and each material having compression elasticity will be described with reference to FIGS.

  As a first example, as shown in FIGS. 4, 5A, and B, a braided fiber is formed to form a braided strip material 9 having a tubular structure, and a synthetic rubber or natural material is formed in the lumen 11 of the tubular structured braided material 9. A core material 12 having compression elasticity represented by rubber is inserted, and the composite strip material of the braided strip material 9 and the core material 12 is used as a connecting material for connecting between the pier 1 and the bridge girder 2 ends.

  As shown in FIG. 5B, the composite strip material of the tubular structure braid material 9 and the core material 12 having compression elasticity is accompanied by the extension of the braid material 9 so as to reduce the diameter of the lumen 11 with respect to the tensile force T. However, while the core material 12 is compressed and stretched, the absorption capacity and the tensile strength are exhibited, and as shown in FIG. 5A, when the tensile force is removed, the core material 12 is quickly restored.

  As a second example, as shown in FIG. 6, a braided fiber is formed to form a braided strip material 9 having a tubular structure, and a synthetic rubber or natural rubber is represented in the lumen 11 of the tubular structured braided strip 9. The granular material 16 having compression elasticity is inserted, and the composite strip material of the braided strip material 9 and the granular material 16 is used as a connecting material for connecting between the ends of the bridge pier 1 and the bridge girder 2.

  As in the case of inserting the core material 12 in FIG. 5B, the composite material of the tubular structure braided material 9 and the granular material 16 having compression elasticity is the braided material 9 so that the diameter of the lumen 11 is reduced with respect to the tensile force. In the same manner as in the case of inserting the core material 12 shown in FIG. 5A, the granule material 16 is compressed while being stretched, and is quickly restored when the tensile force is removed.

  As a third example, as shown in FIG. 10, the connecting material is formed of a braided strip material 9 formed by braiding fibers and imparting stretchability, and a large number of granules 16 having compression elasticity in the braided strip material 9. The composite strip material of the braided strip material 9 and the grain material 16 is used as a connecting material for connecting the bridge pier 1 and the bridge girder 2 ends.

  As in the case of inserting the core material 12 in FIG. 5B, the composite strip material of the tubular structure braid material 9 and the compression elastic particle material 16 is composed of the granular material 16 with the extension of the braided material 9 against the tensile force. While causing compression and exhibiting tensile strength, it restores quickly when the tensile force is removed, as in the case of inserting the core material 12 shown in FIG. 5A.

  As shown in FIG. 11, the granular material 16 shown in the second and third examples is formed of a spherical granular material having compression elasticity, a short and small cylindrical granular material, for example, a rubber granular material.

  Moreover, as the granular material 16 used in the second example, for example, granular materials having various particle diameters of about 1 to 40 mm can be used, and as the granular material 16 used in the third example, for example, 1 A suitable example is a granule having a relatively small particle diameter of about 5 mm.

  As a fourth example, as shown in FIGS. 12 and 7 to 9, the connecting material is braided by mixing chemical fibers or natural fibers 9a and fibers 9b having high compression elasticity and stretchability to form a braided structure and elastic fibers. 9b is formed of a braided strip material 9 which has improved overall stretchability, and a composite strip composed of the chemical fiber or natural fiber 9a and the elastic fiber 9b is connected to the end of the bridge pier 1 and the bridge girder 2 Used as a connecting material for connecting the two.

  As in the case of insertion of the core material 12 in FIG. 5B, the composite strip material causes compression and elongation of fibers having compression elasticity while being stretched by the braided structure itself of the braided strip material 9 with respect to the tensile force, thereby providing tensile strength. As well as exerting the same effect as in the case of inserting the core material 12 shown in FIG. 5A, it is quickly restored when the tensile force is removed.

  The braided strip material 9 of the fourth example will be further described in detail. As shown in FIGS. 7 and 12, a braided braid 9 having a solid structure is formed by using a combination of a chemical fiber or a natural fiber 9a and a fiber 9b having a compression elasticity and a stretch elasticity to form a braided material 9, and this is formed into a bridge pier. Used as a connecting material for connecting between 1 and the two ends of the bridge girder.

  The braided strip 9 having a solid structure knitted by the braid causes active elongation with respect to the tensile force by the braided structure itself and the elastic fiber 9b.

  FIG. 8 shows a braided strip material 9 having the solid structure shown in FIG. 7, and a plurality of braided strip materials 9 are twisted (ropped) to form a connecting material. This shows a case where the bridge pier 1 and the bridge girder 2 end are connected.

  FIG. 9 shows a solid braided strip material 9 shown in FIG. 7, and a plurality of braided strip members 9 are braided to form a connecting material having a sufficient thickness. The case where 1 and the bridge girder 2 edge part are connected is shown.

  As described above, the connecting material composed of the braided strip material 9 shown in each of the above examples forms one connecting material by one, or forms one connecting material by a plurality of the connecting materials, and it is determined by the selection of the number. Strength can be imparted.

  As a specific example, the braiding strip 9 shown in FIGS. 7 to 9 is braided using a combination of chemical fiber or natural fiber 9a and synthetic rubber or natural rubber fiber 9b.

  Even when the core material 12 and the same particle material 16 having the compression elasticity are used, the chemical fiber or the natural fiber 9a and the braid 9b having the compression elasticity exemplified by the synthetic rubber or the natural rubber are used in combination. The core material 12 or the grain material 16 can be inserted or knitted while using the braided strip material 9.

  As shown in FIGS. 13 and 14, at both ends of the braided strip material 9 forming the coupling material shown in the first to fourth examples, a coupling joint 10 braided in a ring shape integrally with the braided strip material 9 is provided. The braided strip 9 and the connecting joint 10 are made into an integral braided structure to increase the resistance to tensile force.

  The present invention does not exclude the formation of the metal joint 10 in addition to forming the braided structure as the joint 10.

  Natural fibers, synthetic fibers, metal fibers, various carbon fibers, and the like can be applied as the fiber material of the braided strip material 9 shown in the first to fourth examples.

  Preferably, Dyneema (trademark) manufactured by Toyobo Co., Ltd. is used as the synthetic fiber. This Dyneema is made of ultra-high molecular weight polyethylene, has ultra-high strength and high elastic modulus, light weight, excellent fatigue resistance, impact resistance, light resistance, etc., and the braiding strip 9 (connecting material) It is a suitable material as a fiber material constituting the material.

  A suitable material is aramid fiber.

  The same Zylon (trademark) manufactured by Toyobo Co., Ltd. can be used as an appropriate material. The xylon is a rigid and extremely linear fiber with a highly linear molecular structure. It has excellent tensile strength, impact resistance, light resistance, etc., and is a suitable material for the above-mentioned braided strip material 9 (connecting material). is there.

  Of course, the above-mentioned dyneema, xylon, aramid fiber, etc. can be used in combination with fibers of other materials.

  The fiber in each of the above examples means a monofilament and includes both multifilaments. When this single fiber has a multifilament structure, a part thereof can be formed of a fiber having compression elasticity.

  As shown in FIGS. 14 and 15, the ring-shaped braided joint 10 shown in FIG. 13 can be provided with a jacket 14 that forms a reinforcing material. As an example, the inner peripheral surface of the ring-shaped braided joint 10 is covered with a U-shaped jacket 14 made of a metal plate or the like.

  As shown in FIGS. 2 and 3, a connecting material composed of a composite material of the braided strip material 9, a core material 12 having compression elasticity, and the same grain material 16, or a chemical fiber or a natural fiber forming the braided strip material 9. 9a and a connecting material composed of a composite material of fibers 9b having compression elasticity, one end is connected to the upper part of the pier 1 via a bracket 5 attached by an anchor bolt 4, and the other end is similarly supported by the pier 1. The bridge girder 2 is connected to the end of the bridge girder 2 via a bracket 5 attached with an anchor bolt 4.

  For example, the braided joint 10 and the bracket 5 are connected to each other via the connecting ring 15.

  FIG. 2 shows a case where the entire length of the connecting material is formed by the above-mentioned braided strip material 9 and one end and the other end thereof are connected to the end of the bridge girder 2 and the pier 1 respectively. FIG. The case where the braided strip material 9 having the above composite structure is used as the partial length is shown.

  For example, as shown in FIG. 3, an example in which a connecting material composed of the above-described braided strip material 9 is used for the partial length of the connecting material and a known metal connecting chain 3 ′ is used for the other partial length. Show. The braided strip 9 and the connecting chain 3 'are formed by connecting a braided joint 10 formed at one end of the braided strip 9 to one end of an end ring constituting the chain 3' to form a single connecting member. The other end of the braided strip 9 is connected to the end of the bridge pier 1 or bridge girder 2 via a bracket 5 or the like.

  As shown in FIG. 2, the connecting material made of the braided strip material 9 is loosely fitted with a protective tube 13 made of synthetic resin, metal, or the like to provide weather resistance. That is, the protective tube 13 is not rigidly connected to the braided strip 9, or is weakly joined or press-fitted to provide extra weather resistance.

  The protective tube 13 can be extrapolated so as to cover both the connecting chain 3 'and the connecting braid 9 shown in FIG.

Sectional drawing which shows the principal part which shows the falling-bridge prevention structure using the conventional connection chain. The principal part sectional drawing which shows the fallen bridge prevention structure using the braiding strip material which consists of a composite structure which concerns on this invention. The principal part sectional drawing which shows the other example of the fallen bridge prevention structure using the braided strip material which consists of a composite structure which concerns on this invention. The principal part perspective view which shows the connection material which has the composite structure which made the said braided strip material the pipe structure, and inserted the core material which has compression elasticity. A is principal part sectional drawing of the said braided strip material, B is principal part sectional drawing which shows the expansion | extension state. The principal part sectional drawing which shows the connection material which has the composite structure which made the said braided strip material the pipe structure, and inserted the granular material which has compression elasticity. The principal part perspective view which shows the 1st example of the knitting structure of the braided strip material which knits the granular material which has compression elasticity. The principal part perspective view which shows the 2nd example of the knitting structure of the braided strip material which knits the granular material which has compression elasticity. The principal part perspective view which shows the 3rd example of the knitting structure of the braided strip material which knits the granular material which has compression elasticity. The principal part side view which shows the state which knitted the granular material which has the said compression elasticity in the said braided strip material. The perspective view which illustrates the granular material which has the said compression elasticity. The side view of the chemical fiber or natural fiber which forms the said braiding strip, and the fiber which has compression elasticity. The side view of the connection material which shows the case where the ring-shaped connection coupling integrally braided to the said braiding strip material is formed. The side view which shows the case where the reinforcement coating | cover is formed in the connection coupling of the said braided strip material. AA line sectional view of Drawing 14.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bridge pier, 2 ... Bridge girder, 3 '... Connection chain, 4 ... Anchor bolt, 5 ... Bracket, 9 ... Braiding strip material, 9a ... Chemical fiber or natural fiber, 9b ... Fiber which has compression elasticity, 10 ... Connection joint, DESCRIPTION OF SYMBOLS 11 ... Lumen, 12 ... Core material, 13 ... Protection tube, 14 ... Outer casing, 15 ... Connection ring, 16 ... Granule material which has compression elasticity, T ... Tensile force.

Claims (5)

In the anti-falling bridge structure in which the bridge piers and the bridge girder ends are connected with a connecting material to prevent the falling bridge, the connecting material is formed of a braided strip material that is braided with fibers to give stretchability, and the braiding strip A structure for preventing a falling bridge, characterized in that the material is formed into a tube structure and a core material having compression elasticity is inserted into the lumen. In the anti-falling bridge structure in which the bridge piers and the bridge girder ends are connected with a connecting material to prevent the falling bridge, the connecting material is formed of a braided strip material that is braided with fibers to give stretchability, and the braiding strip A structure for preventing a falling bridge, characterized in that the material is formed into a tube structure and a large number of granular materials having compression elasticity are inserted into the lumen. In the anti-falling bridge structure in which the bridge piers and the bridge girder ends are connected with a connecting material to prevent the falling bridge, the connecting material is formed of a braided strip material that is braided with fibers to give stretchability, and the braiding strip A fall-bridge prevention structure characterized by having a structure in which a large number of granular materials having compression elasticity are knitted in the material. In the anti-falling bridge structure in which the bridge pier and the end of the bridge girder are connected by a connecting material to prevent the falling bridge, the connecting material is provided with elasticity by braiding the chemical fiber or the natural fiber and the fiber having compression elasticity. A fall-bridge prevention structure characterized by being formed of braided strip material. 5. A falling bridge prevention structure according to claim 1, wherein a protective tube is extrapolated to the braided strip material.

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