JP5873303B2 - Telescopic device for bridge and its construction method - Google Patents

Description

  The present invention relates to a bridge expansion and contraction device that absorbs expansion and contraction due to temperature changes and deflection of bridge girders such as road bridges and viaducts, and a construction method thereof.

  2. Description of the Related Art Conventionally, a steel expansion / contraction device having a comb-shaped steel joint member on the upper surface side is known as a bridge expansion / contraction device (see, for example, Patent Document 1).

  As another form of expansion device for bridges, a rubber expansion device having a rubber joint on the upper surface side is also known (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 2005-9312 JP 2008-25324 A

  In the conventional case, the upper surface side of the expansion / contraction apparatus is made of steel or rubber, and a concrete layer is formed using concrete in a portion for fixing the expansion / contraction apparatus main body. On the upper surface side of the expansion and contraction device, two surface portions having different materials, that is, the surface of the steel portion or the rubber portion and the surface of the concrete layer were generated. For this reason, when a joint of different materials is generated on the surface of the expansion / contraction device and the vehicle travels through the expansion / contraction device, noise and vibration are generated at the connection. Also, if the surface of the telescopic device is made of steel, the tires of the passing vehicle tend to slip when it rains, and if the antifreeze material is sprayed on the surface of the steel part, the steel material on the surface is particularly at the end in the width direction. There was a problem of being easily corroded. Further, when the surface of the expansion / contraction device is made of rubber, there has been a problem that the surface rubber is deteriorated at an early stage due to repeated traffic vehicles or the influence of ultraviolet rays.

  Accordingly, an object of the present invention is to provide a bridge expansion and contraction device having a steel-concrete composite structure that has a slip-preventing function for a passing vehicle and that does not easily corrode steel materials, and a construction method therefor.

In order to advantageously solve the above-described problem, the bridge expansion and contraction device according to the first aspect of the present invention is an expansion and contraction device for a joint portion of a bridge, in a steel material having a substantially L-shaped cross section provided with a web and a flange integrated therewith. A joint in which the flange is horizontally disposed, and at least the flange is embedded and embedded integrally so as to be embedded by a high-strength fiber cement-based reinforcing layer having a predetermined thickness, and the upper surface of the high-strength fiber cement-based reinforcing layer is the road surface. A metal fitting is provided, and an anchor material is fixed to the web of the metal fitting to form a metal fitting with an anchor material, and a pair of metal fittings with an anchor material are arranged so as to face each other at intervals in the road longitudinal direction. It is provided , The concrete layer hardened in the state with which concrete was filled in the back side of the joint metal fitting with the anchor material is formed, It is characterized by the above-mentioned.

  According to a second invention, in the bridge expansion and contraction device according to the first invention, the upper portions of the flange and the web are embedded by the high-strength fiber cement reinforcing layer.

In the third invention, in the bridge expansion and contraction device of the first invention or the second invention, the joint metal fitting with anchor material is arranged so as to be in direct contact with and adjacent to the high-strength fiber cement-based reinforcing layer in the joint metal fitting with anchor material. A hardened concrete layer is formed in a state in which concrete is filled on the back side.

  In the fourth invention, in the bridge expansion and contraction device according to the first to third inventions, the high-strength fiber cement-based reinforcing layer is a high-strength fiber cement-based reinforcing layer made of high-strength fiber concrete or high-strength fiber mortar. It is characterized by.

  According to a fifth invention, in the bridge expansion and contraction device according to the first to fourth inventions, the substantially L-shaped steel material is a steel material obtained by cutting an angle steel with a predetermined length.

  In the construction method of the bridge expansion and contraction device according to the sixth aspect of the invention, the high-strength fiber cement-based reinforcing layer of the joint metal fitting with the pair of anchor members in the bridge expansion and contraction device according to any of the first to fifth aspects of the invention is the road longitudinal direction. After mounting fitting hardware with each anchor material on the floor slabs facing each other or with the floor slab and the parapet notched stepped, facing each other with a gap between them, the joint with the anchor material The concrete layer is formed by placing concrete in the notched step portion so as to embed the back side of the hardware and up to the upper surface position of the high-strength fiber cement reinforcing layer.

According to the present invention, the following effects can be obtained.
(1) The surface layer material in the joint is a high-strength fiber cement system such as high-strength fiber concrete or high-strength fiber mortar, which is the same cement-based material as the concrete layer on the back side, and the skin separation between cement-based members Since it is difficult to wake up, it is difficult for noise caused by gaps due to skin separation. In the case of steel joints and concrete as in the past, there is a gap and noise is caused by the gap when the vehicle is passing. However, in the present invention, noise is caused by the gap due to skin separation as described above. Hard to do.
(2) The surface layer material at the joint is a cement-based material such as high-strength fiber concrete or high-strength fiber mortar, and the friction coefficient with the rubber tire is higher than that of steel, so the passing vehicle slips. Hard to do.
(3) Since the steel material is reinforced and integrated with a high-strength cement-based material such as high-strength fiber concrete or high-strength fiber mortar and is protected and integrated, the steel material is resistant to corrosion and only the steel material Rigidity is higher than In particular, in areas where anti-freezing materials are sprayed, there is no steel material on the surface, so the steel material will not corrode immediately (especially the width direction steel material edge).
(4) The surface layer material in the joint is high-strength fiber concrete or high-strength fiber mortar, which is more durable than conventional rubber joints.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially longitudinal front view showing a bridge telescopic device according to an embodiment of the present invention. It is a top view of the expansion-contraction apparatus for bridges shown in FIG. It is explanatory drawing when a wheel load acts on the front-end | tip part. It is a longitudinal front view which takes out and shows one coupling in the expansion-contraction apparatus used for FIG. FIG. 5 is a plan view of a part of one joint shown in FIG. 4. It is a partial side view which shows a part of one coupling shown in FIG. It is a vertical front view which shows the 1st process of a construction procedure. It is a vertical front view which shows the state which installed the coupling apparatus. It is a top view of the state shown in FIG. It is a bottom view which abbreviate | omits and shows the anchor material etc. in the apparatus shown in FIG. Sectional drawing which shows the form which provided the vertical through-hole in the flange in order to raise the integration with the flange in the high strength fiber cement system reinforcement layer which consists of high-strength fiber concrete or high-strength fiber mortar, and the section in the section L-shaped steel It is. It is sectional drawing which shows the form which heightened integration by attaching | subjecting a bolt and a nut to the part of the vertical through-hole of each flange, and embedding it in a reinforcement fiber mixing concrete type coating layer. A cross section showing a form in which a rough surface by unevenness by application of an adhesive or a rough surface by unevenness by blasting such as shot blasting is provided on the flange and the web, and a reinforcing fiber-mixed concrete coating layer is provided so as to embed the rough surface FIG. It is sectional drawing which shows the form which does not coat | cover the flange of a steel material with a substantially L-shaped cross section, and the upper part of a web with a reinforcing fiber mixing concrete type coating layer.

    Next, the present invention will be described in detail based on the illustrated embodiment.

  First, a joint metal 2 and a joint metal 3 with an anchor material used in the bridge expansion and contraction device 1 (see FIGS. 1 to 3) of the present invention will be described with reference to FIGS.

  The joint hardware 2 and the joint metal 3 with an anchor material are provided with a flange 5 having an L-shaped steel material or an angle steel, and arc-shaped irregularities 4a are alternately formed at the projecting tip. A steel material 7 having a substantially L-shaped cross section is integrally provided with a web 6 integrally provided. The steel material 7 having an approximately L-shaped cross section is made of angle steel or the like, and one side thereof is horizontally arranged as a flange 5 and the other side is arranged vertically as a web 6. In the illustrated steel material 7 having a substantially L-shaped cross section, one side of the angle steel is cut to a predetermined length, a flange 5 is formed, and the length in the longitudinal direction of the member is cut to a predetermined length. Is formed.

  The projecting front end edge of the flange 5 is formed as a front end edge that is formed by alternately forming concave and convex portions in the longitudinal direction of the member and curved in a waveform, and is formed in parallel with the finger portion 4 described later. Alternatively, the projecting tip edge of the flange 5 is a straight projecting tip in plan view as shown by a two-dot chain line 4a in FIG. At least the upper surface and the back surface of the flange 5 are embedded by a high-strength fiber cement-based reinforcing layer 9 made of a high-strength fiber cement-based material, preferably high-strength fiber concrete or high-strength fiber mortar, and are reinforced and reinforced to be integrated. It has become. In the illustrated form, the upper and back surfaces of the flange 5 and the upper portion of the web 6 are embedded and integrated with a high-strength fiber cement reinforcing layer 9 made of high-strength fiber concrete or high-strength fiber mortar.

  On the upper surface of the high-strength fiber cement-based reinforcing layer 9, there are a number of obtuse V-shaped slip prevention grooves spaced apart in the member width direction and spaced in the member longitudinal direction (in the road width direction). 10 is formed. Since the upper surface of the high-strength fiber cement-based reinforcing layer 9 is made of concrete, the friction coefficient with the rubber tire (rubber) is higher than that of the steel plate, thereby preventing slipping of the vehicle and the above-mentioned many It is set as the form which can aim at slip prevention further by providing the V-shaped groove | channel 10 of this.

  The front edge of the high-strength fiber cement-based reinforcing layer 9 covering the front edge of the flange 5 in the width direction is a finger portion 4 in the form of a curved waveform in which concave portions and convex portions are alternately formed in the longitudinal direction of the member. Yes. The back surface of the high-strength fiber cement-based reinforcing layer 9 is provided with an inclined back surface 11 that is gradually inclined toward the web 6 from the lower part toward the upper part.

  As the cement-based material forming the high-strength fiber cement-based reinforcing layer 9, it is preferable to use reinforcing fiber mixed concrete, reinforcing fiber mixed non-shrink mortar, polymer cement mortar, reinforcing fiber mixed mortar, or the like. As the reinforcing fibers mixed in these materials, for example, high-strength reinforcing fibers such as steel fibers (steel, stainless steel), vinylon fibers, PP (polypropylene) fibers, carbon fibers, and aramid fibers can be used. As the reinforcing fiber, either one or both of short fibers and long fibers may be used. Moreover, it is good also as a high intensity | strength cementitious material (concrete or mortar) which put FRP (fiber reinforced plastic) in the cementitious material.

  The thickness dimension of the high-strength fiber cement reinforcing layer 9 is set by design. In order to enhance the adhesion and integration of the high-strength fiber cement reinforcing layer 9 and the flange 5, the front surface and the back surface of the flange 5 may be roughened. A through-hole penetrating from the front surface to the back surface may be provided to enhance integration with the high-strength fiber cement reinforcing layer 9.

  When providing each through-hole in each of the flanges 5, for example, as shown in FIG. 11, one or a plurality is provided in the width direction of each flange 5 and a plurality is provided in the longitudinal direction of the member. The high-strength fiber cement reinforcing layers 9 on the upper surface side and the lower surface side of each flange 5 may be connected and integrated at the longitudinal through-hole 20 portion.

  Further, as shown in FIG. 12, the shaft portion of the bolt 21 is inserted into the vertical through hole 20 of each flange 5 and a nut 22 is attached, and the bolt 21 and the nut 22 are reinforced with high-strength fiber cement. By being provided so as to be embedded in the layer 9, it may be provided as a displacement preventing member and as a member that enhances the adhesion effect.

  Further, as shown in FIG. 13, an adhesive is applied to the top surface and back surface of the flange 5, the side surface of the flange tip, and the top surface, back surface, or both front and back surfaces of the web 6. ) To provide a rough surface 23 of unevenness or a rough surface 23 of unevenness by blasting such as shot blasting, and by providing the high-strength fiber cement-based reinforcing layer 9 so as to embed the rough surface 23, so as to enhance integration Good.

  On the back side of the web 6, an anchor material 12 made of steel anchor bolts is provided so as to protrude horizontally, and its base end is fixed to the web 6 with welding in the longitudinal direction of the member. As a result, a joint fitting 3 with an anchor material is formed.

  Next, when constructing using the joint metal fitting 3 with the anchor material as described above, as shown in FIG. 1 to FIG. However, the notch step portion 15 at the end of the floor slab 14 facing at an interval is omitted so as to oppose the joint metal fitting 3 with an anchor material in a form shifted by a half pitch at an interval, or illustration is omitted. , And the notch step 15 formed at the end of the floor slab and the notch step formed on the parapet.

  When installing the joint metal fitting 3 with the anchor material, the joint metal fitting 3 with the anchor material is attached to the U-shaped reinforcing bar or the vertical anchor 13 erected so that the base end side is embedded and fixed to the bottom of the notch step portion 15. An anchor member 12 made of steel anchor bolts is fixed by welding or the like together with the reinforcing horizontal reinforcing bars 16. The upper end level of the inclined back surface 11 is embedded so as to embed the U-shaped rebar or vertical anchor 13, the steel anchor material 12 and the reinforcing horizontal rebar 16, and so as to embed the back side of the high-strength fiber cement reinforcing layer 9. Until then, concrete is cast to form a concrete layer 17 and integrated with the high-strength fiber cement-based reinforcing layer 9.

  A backup material 18 such as a resin or rubber sponge is provided between the webs 6 facing each other at an interval, and an elastic water-proof sealing material 19 such as a polybutadiene resin is provided for a bridge. A telescopic device 1 is constructed.

  As shown in FIG. 3, when a vertical force P due to a wheel load is applied to the joint portion in the bridge expansion and contraction device 1 configured as described above, the high-strength fiber cement-based reinforcing layer 9 passes through the flange 5. The vertical force P <b> 1 acting on the web 6 is transmitted from the horizontal anchor material 12 to the concrete layer 17 through transmission of shearing force between the web 6 and the horizontal anchor material 12. Further, the vertical force P <b> 2 is transmitted from the bottom of the high strength fiber cement reinforcing layer 9 to the concrete layer 17.

  Since the back surface of the high-strength fiber cement-based reinforcing layer 9 is the inclined back surface 11 with respect to the bending moment when the vertical force P is applied, the inclined back surface 11 of the high-strength fiber cement-based reinforcing layer 9 is used. The concrete layer 17 covering the substrate resists.

  On the other hand, as shown in FIG. 14, the upper surface of the flange 5 and the upper surface of the concrete layer 17 in the steel material 7 having a substantially L-shaped cross section are formed in the same plane without providing the high-strength fiber cement reinforcing layer 9. However, when the wheel load P is applied, a bending moment is applied to the flange 5, so that the upper end of the flange 5 and the web 6 and the end of the concrete layer 17 are separated.

  As in the embodiment, the surface layer is made of concrete like the high-strength fiber cement reinforcing layer 9 in the joint portion, and the same concrete material as the concrete layer 17 that integrates the expansion and contraction device is used. As in steel and steel, joints of dissimilar materials that easily break apart do not occur, and noise and vibration are suppressed.

  In the joint, the surface layer is the high-strength fiber cement-based reinforcing layer 9 and the web 6 embedded thereby, and the high-strength fiber cement-based reinforcing layer 9 supports the wheel load. It can be set as the structure supported by the anchor material 12 attached to the web 6 and being embedded and fixed to the concrete layer 17.

  Further, since the high-strength fiber cement-based reinforcing layer 9 has a surface layer made of concrete, it is easy to prevent slipping, such as forming a rough surface or a groove 10. Moreover, the effect that the said high-strength fiber cement type reinforcement layer 9 can be used as the joint metal fitting 2 made from precast or the anchor material 3 formed in the factory etc. previously is acquired.

  With the high-strength fiber cement-based reinforcing layer 9, the precast joint metal 2 or the joint metal 3 with an anchor material does not expose the antifreeze material on the steel material because the steel material is not exposed. Even if the anti-freezing material is sprayed, the steel material is not exposed, so that the steel material does not corrode early. Since the surface layer is made of cement by the high-strength fiber cement-based reinforcing layer 9, effects such as superior durability can be obtained as compared with a conventional rubber expansion / contraction device.

  As mentioned above, in the said embodiment, it is set as the road bridge expansion-contraction apparatus made into the steel concrete composite structure which is hard to receive the noise by the influence of a passing vehicle, has a slip prevention function of a passing vehicle, and a steel material does not corrode easily.

  When practicing the present invention, the anti-slip groove provided on the surface of the high-strength fiber cement-based reinforcing layer 9 may be an appropriate arc-shaped anti-slip groove such as a double arc-shaped groove. When carrying out the present invention, either or both of the front surface and the back surface of the flange 5 may be roughened to enhance adhesion and integration with the high-strength fiber cement reinforcing layer 9.

  You may use together so that a reinforcing fiber sheet may be embedded in the surface layer part of the high-strength fiber cement type reinforcement layer 9. FIG. A carbon fiber sheet or the like may be used as the fiber sheet.

DESCRIPTION OF SYMBOLS 1 Bridge expansion / contraction apparatus 2 Joint metal 3 Joint metal with anchor material 4 Finger part 4a Arc-shaped unevenness 5 Flange 6 Web 7 Steel material with a substantially L-shaped cross section 9 High-strength fiber cement-based reinforcing layer 10 Groove 11 Inclined back surface 12 Anchor bolt (Anchor material)
13 Vertical anchor 14 Floor slab 15 Notch step 16 Reinforcement horizontal reinforcing bar 17 Concrete layer 18 Backup material 19 Water seal material 20 Vertical through hole 21 Bolt 22 Nut 23 Rough surface

Claims (6)

A telescopic device for a joint portion of a bridge, wherein the flange in a substantially L-shaped steel material having a web and a flange integrated with the web is horizontally arranged, and at least the flange is a high-strength fiber cement system having a predetermined thickness Embedding and embedding so as to be embedded by a reinforcing layer, and having a joint metal with the upper surface of the high-strength fiber cement-based reinforcing layer as a road surface, and fixing the anchor material to the web in the joint metal In a state in which a pair of joint fittings with an anchoring material are arranged so as to face each other with a distance in the longitudinal direction of the road, and the back side of the jointing fitting with an anchoring material is filled with concrete. A bridge expansion and contraction device, characterized in that a hardened concrete layer is formed.   The expansion / contraction device for a bridge according to claim 1, wherein upper portions of the flange and the web are embedded by the high-strength fiber cement reinforcing layer. A hardened concrete layer is formed in the state where the concrete is filled on the back side of the joint hardware with anchor material so as to be in direct contact with and adjacent to the high-strength fiber cement reinforcing layer in the joint hardware with anchor material. The expansion / contraction device for bridges according to claim 1 or 2 characterized by things.   The bridge structure according to any one of claims 1 to 3, wherein the high-strength fiber cement-based reinforcing layer is a high-strength fiber cement-based reinforcing layer made of high-strength fiber concrete or high-strength fiber mortar. Telescopic device.   The expansion / contraction device for a bridge according to any one of claims 1 to 4, wherein the substantially L-shaped steel material is a steel material obtained by cutting an angle steel with a predetermined length.   The high-strength fiber cement-based reinforcing layer of the pair of joint metal fittings with the anchor material in the bridge expansion and contraction device according to any one of claims 1 to 5, and facing the space in the longitudinal direction of the road. After the fitting metal fittings with each anchor material are installed in the notch steps of the floor slabs facing each other or between the floor slab and the parapet, the back side of the fitting metal fittings with the anchor material is embedded, and the height A construction method of a bridge expansion and contraction device, wherein concrete is formed by placing concrete in the notched step portion to the upper surface position of a strength fiber cement reinforcing layer.

Images