JP2013036205A - Construction method for joining wall balustrade of bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for joining a wall balustrade of a bridge, which enables the replacement of the wall balustrade to be efficiently, easily and firmly performed for the new construction and repair reinforcement of the wall balustrade of the road bridge.SOLUTION: A plurality of reinforcements 3 are formed by exposing reinforcements 13a arranged in a floor slab section 1. A plurality of L-shaped or C-channel reinforcements 4 are arranged in the state of being joined to the reinforcements 3. A precast wall balustrade 2 is installed. A plurality of longitudinal reinforcing bars 8 continuing in the bridge axis direction of the floor slab section 1 are arranged between the precast wall balustrade 2 and the floor slab section 1. Shrinkage-compensating mortar 9 is placed. Closure reinforcements 7 forming a plurality of rectangles are arranged at the lower end of the precast wall balustrade 2. The L-shaped or C-channel reinforcements 4 are arranged in such a manner as to form a pseudo closure joint.

Description

  The present invention aims at shortening the construction period of the bridge construction, and with regard to the construction of the wall rail, it is efficient and easy to replace the newly installed wall rail and the existing wall rail mainly installed on the floor slab part of the road bridge. Moreover, it can be performed firmly.

  At the end of the width of the floor slab of the road bridge, a concrete wall rail is installed mainly for the purpose of guiding the line of sight of the automobile or for preventing the motor vehicle from deviating outside the bridge surface.

  This type of wall railing is generally constructed with cast-in-place concrete, and replacement due to deterioration of the wall rail has been carried out with cast-in-place concrete so far, but recently, stable quality, strength, improved durability, In consideration of labor saving, shortening of construction period, improvement of construction environment (decrease in noise), etc., there are an increasing number of cases carried out by precast concrete wall rails (hereinafter referred to as precast wall rails) manufactured at JIS factories.

  In recent years, a plurality of precast wall rails have been installed adjacent to each other in the bridge axis direction of the floor slab as a new wall rail, and the connection between the floor slab and the precast wall rail is between the floor slab and the precast wall rail. A non-shrinkable mortar is placed on the surface, and after curing, both are connected by a vertical connecting bolt.

  In addition, the precast wall rails adjacent to each other in the bridge axis direction are joined to each precast wall rail by providing a duct in the bridge axis direction, inserting a PC steel material therein, and tensioning them together.

JP 2002-88716 A JP 2010-121360 A Japanese Patent Laid-Open No. 2007-148677

  However, in the construction of the new precast wall rails described above, it is necessary to connect the floor slab and the precast wall rails with vertical bolts, and the precast wall rails adjacent to the bridge axis direction are connected with PC steel. Need to be integrated. For this reason, workability | operativity is bad and it cannot be said that economical efficiency is also favorable.

  Especially in the case of replacement of wall rails, it is necessary to open several bolt holes in the vertical direction for passing the connecting bolts through the floor slab part in the conventional precast wall rail construction, and much time is required for drilling the bolt holes. Cost.

  In addition, it is necessary to perform the arrangement and fixing work of the connecting bolts in an upward posture from the bottom side of the floor slab part. Durability is also a concern due to rusting of the connecting bolts.

  In addition, since a large stress (mainly bending tensile stress) is generated in the wall height of the road bridge due to the collision load when a traffic vehicle collides, it is desirable to have a structure that can sufficiently withstand the load at the time of the collision. It is.

  The present invention has been made to solve the above-mentioned problems, and it is possible to efficiently and easily perform the replacement of the wall rails for the purpose of newly installing or repairing the wall rails of the road bridge efficiently and easily. The purpose is to provide a method of joining bridge railings that can be made.

  The method of joining bridge wall rails according to claim 1 is a method of joining bridge wall rails in which a precast wall rail for a bridge is joined to a concrete floor slab, and a mechanical joint reinforcing bar arranged at the upper end of the floor slab and the lower end of the precast wall rail A process of superimposing rectangular closed reinforcing bars arranged in the bar, arranging a plurality of longitudinal reinforcing bars continuous in the bridge axis direction in the closed reinforcing bars, and placing a non-shrinkable mortar. It is characterized by.

  Therefore, with regard to the repair of the wall rails, the existing wall rails installed on the bridge slab are removed, and then the existing wall rails are installed in the bridge wall rail joint method in which precast wall rails are installed as new wall rails. The step of removing the handrail, the step of exposing the existing reinforcing bars arranged in the cross-sectional portion from which the existing wall railing is removed, and arranging a plurality of L-type or C-channel type reinforcing bars joined to the reinforcing bars A process, a step of installing a precast wall rail at a position where an existing wall rail has been removed, and a plurality of longitudinal reinforcing bars arranged in the bridge axis direction of the floor slab between the precast wall rail and the floor slab. And a step of placing a non-shrinkable mortar.

  On the other hand, in the case of new construction, the reinforcing bar processing arranged in the floor slab part, the process of installing the precast wall railing, and the bridge axis direction of the floor slab part between the precast wall railing and floor slab part It comprises a step of arranging a plurality of continuous vertical reinforcing bars and placing non-shrinkable mortar.

  In the present invention, a precast wall rail is installed on a concrete floor slab as a new wall rail, and a vertical bolt hole that affects the durability of the floor slab is formed by joining the precast wall rail and the floor slab part. The existing wall rails can be repaired and strengthened extremely efficiently, easily and firmly by wet bonding using vertical reinforcing bars and the like, which are not provided, but are arranged on the floor slab.

  In conventional joining with bolts or the like, it is necessary to provide bolt holes for fastening bolts in the floor slab (existing bridge), and it is difficult to adjust the height of the wall rails. By connecting the precast wall rail to the floor slab using the rectangular closed reinforcing bar arranged at the lower end of the wall rail and the existing reinforcing bar arranged in the floor slab, a bolt hole is formed in the floor slab. The height of the wall rails can be easily adjusted, and the joint between the floor slab and the precast wall rail can be made as narrow as possible, and compared to bolted joints on both the strength and durability sides. Therefore, it has the same or better performance.

  In this case, the size of the precast wall rail is preferably about 3 m and 5 m in consideration of transportation and erection performance at the time of construction on the site, and further considering the structural plane alignment.

  The mortar to be cast at the joint between the precast wall rail and the floor slab is preferably a highly durable mortar based on a blast furnace cement system which is crack-resistant and resistant to salt damage and can also contribute to reducing environmental impact.

  The method for joining bridge wall rails according to claim 2 is a method of joining bridge wall rails according to claim 1, in which a rectangular closed rebar is arranged at the lower end of the precast wall rail, and at the upper end of the floor slab, The reinforcing bar is characterized in that an L-type or C-channel type reinforcing bar is mechanically connected to the reinforcing bar exposed at the upper end of the floor slab so as to form a pseudo rectangular reinforcing bar.

  In the case of newly installed reinforcing bars at the upper end of the floor slab, the arranged reinforcing bars are used. In the case of repair, the reinforcing bar exposed at the upper end of the floor slab is L-shaped or C-channel type. May be arranged so as to form a quasi-rectangular reinforcing bar by mechanical coupling.

  By using the newly-developed special reinforcing bar joint as described above for the joint between the precast wall rail and the floor slab, the joint can be made compact and have a small cross section, and rapid construction shortens the construction period. Is possible.

  In the newly developed special reinforcing steel joints in this case, all the bars are arranged so that the joint surface is formed in the vertical plane perpendicular to the bridge axis of the floor slab part, and alternately located in the bridge axis direction. Arrangement should be done.

  The method for joining the bridge wall rails according to claim 3 is the method for joining the bridge wall rails according to claim 1 or 2, wherein the steel bars are used for the reinforcing bars exposed at the upper end of the slab and the L-type or C-channel type reinforcing bars. The rebar exposed at the upper end of the floor slab and the L- or C-channel rebar are joined by a mechanical joint using a steel sleeve (OS grip method). , The reliability of the joint can be increased.

  The method for joining bridge wall rails according to claim 4 is the method for joining bridge wall rails according to any one of claims 1 to 3, wherein the lower end surface of the precast wall rail is formed obliquely. It is what.

  The present invention avoids the accumulation of air, breathing water, latency, etc. in the joint when placing mortar or concrete in the joint, and prevents a decrease in strength of the joint due to poor placement of mortar or concrete. It is what you do.

  According to the present invention, since the lower end surface of the precast wall rail is formed obliquely, air, breathing water, and latency of the joint portion are placed along the inclined surface (taper) at the same time that mortar or concrete is placed. Since it is discharged out of the part, air, breathing water or the like does not accumulate in the joint part, and mortar or concrete can be placed densely without gaps in the whole joint part.

  In addition, the inclined surface (taper) in this case should just be formed in the up-slope on the floor slab part side of a bridge axis perpendicular direction.

  In the present invention, a precast wall rail is installed as a new wall rail at a position where a newly installed floor slab or an existing wall rail is removed, and the connection between the precast wall rail and the floor slab is durable to the floor slab. By using special rebar joints without bolt holes affecting the wall, it is extremely efficient, easy, and robust to replace wall rails for the purpose of newly installing wall rails or repairing and reinforcing them. be able to.

  In addition, since no connecting bolt is required, there is no need to open a bolt hole for passing the connecting bolt through the floor slab part. For this reason, the strength of the floor slab part is reduced by drilling the bolt hole, and rusting of the connecting bolt due to water leakage. There is no risk of lowering durability.

It is a partial perspective view which shows the wall rail of the repaired bridge. It is a partial perspective view of a precast wall rail. The reinforcing bar protruding from the floor slab part and the L-type or C-channel type reinforcing bar joined to the reinforcing bar are shown, (a) is a partial front view thereof, and (b) is shown in FIG. FIG. The joint part of the precast wall rail adjacent to the bridge axis direction of a floor slab part is shown, (a) is the partially exploded perspective view, (b) is the B section cross-sectional view in FIG. 1, (c) is in FIG. It is a B section partial longitudinal cross-sectional view. It is a partial perspective view which shows the existing bridge wall height rail. It is a partial perspective view of a floor slab part showing a reinforcing bar protruding from the floor slab part. It is a partial perspective view of a floor slab part showing a state where a plurality of L-type or C-channel type reinforcing bars are arranged by joining to each reinforcing bar. It is a partial perspective view of a floor slab part showing a state in which a precast wall rail is installed on the floor slab part, a vertical reinforcing bar is arranged, and an outer mold frame and an inner mold frame are installed. It is a partial perspective view of the wall rail which shows the state which repair was completed.

  1 to 4 show wall height rails of a repaired road bridge. In the drawings, a plurality of precast wall height rails 2 are bridges of the floor slab portion 1 at both width ends of the floor slab portion 1 made of PC structure or RC structure. It is installed adjacent to each other in the axial direction. Each precast wall rail 2 is joined on the floor slab portion 1 and is joined together in the bridge axis direction of the floor slab portion 1.

  In the joint A between the floor slab portion 1 and each precast wall rail 2, a plurality of reinforcing bars 3 projecting vertically on the floor slab portion 1 are arranged at regular intervals in the bridge axis direction of the floor slab portion 1 and in the direction perpendicular to the bridge axis. Every other bar is arranged. In addition, a plurality of L-type or C-channel type reinforcing bars 4 are arranged in connection with each reinforcing bar 3.

  The L-type or C-channel type rebar 4 is mechanically joined to the end of the rebar 3 via an elliptical steel sleeve 5 and is a vertical plane in the direction perpendicular to the bridge axis of the floor slab 1 on the floor slab 1. The reinforcing bars are arranged so as to form a reinforcing bar joint surface.

  In this case, the ends of the reinforcing bar 3 and the L-type or C-channel type reinforcing bar 4 are respectively inserted into the steel sleeve 5 from above and below, and from the wedge holes provided in the steel sleeve 5, the reinforcing bar 3 and the L-type are inserted. Alternatively, the wedge 6 is press-fitted into the lap portion with the C channel type reinforcing bar 4 so as to be integrally joined.

  On the other hand, a plurality of closed reinforcing bars 7 forming a rectangle in a vertical plane perpendicular to the bridge axis of the floor slab part 1 are arranged at regular intervals in the bridge axis direction of the floor slab part 1 at the lower end of the precast wall height column 2. Further, the reinforcing bars 7 and the L-type or C-channel type reinforcing bars 4 by the mechanical joint are arranged so as to be alternately positioned in the bridge axis direction of the floor slab portion 1.

  A plurality of vertical reinforcing bars 8 are continuously arranged in the bridge axis direction of the floor slab portion 1 through a closed reinforcing bar 7 that forms a rectangle with the L-type or C-channel type reinforcing bar 4. In addition, a non-shrinkable mortar 9 is placed over the entire joint A of the floor slab 1 and each precast wall rail 2.

  As shown in FIGS. 1 and 2, the closed reinforcing bars 7 forming a rectangle are arranged in a substantially rectangular shape with the lower end portion being horizontal in the direction perpendicular to the bridge axis.

  Since the closed rebar 7 forming the rectangle is arranged in such a shape, the gap of the joint A can be made smaller than that of a general rebar joint, and thus the joint A can be compactly constructed. Can do.

  Moreover, the taper 2a which inclines in the orthogonal | vertical direction of a bridge axis is formed in the lower end part of the precast wall height column 2 in order to improve the placing property when placing a non-shrinkable mortar.

  By forming the taper 2a at the lower end of the precast wall height column 2, air or the like of the joint (joint part) A is discharged from the joint A along the taper 2a at the same time as the non-shrink mortar is placed. As a result, air or the like is not trapped in the joint portion A, and the non-shrink mortar can be densely placed on the entire joint portion A without a gap.

  With the above configuration, each precast wall rail 2 is integrally joined on the width end of the floor slab 1.

  Moreover, in the junction part B of each precast wall rail 2 adjacent to the bridge axis direction of the floor slab 1, a concave groove 10 is formed on the joint end surface of one precast wall rail 2, and the other precast wall rail 2 is joined. A T-shaped joint 11 projects from the end surface.

  The web portion 11 a of the joint 11 is inserted into the concave groove 10, and a non-shrinkable mortar 12 is placed around the web portion 11 a in the concave groove 10.

  With the above configuration, the precast wall rails 2 adjacent to each other in the bridge axis direction are integrally joined.

  In particular, as shown in the drawing, the concave groove 10 is formed in a trapezoidal dovetail shape in plan view, a striped steel plate 10a is attached to the inner peripheral surface, and the web portion 11a of the joint 11 is made of PBL (perforated steel plate). ), The adhesion force and the pulling force of the non-shrinkable mortar 12 are remarkably enhanced, and the proof stress of the joint B can be remarkably improved. Further, the joint portion B can be minimized, and the wall rails can be joined in a compact manner within the cross-sectional dimensions of the wall rails. The web 11a of the joint 11 may be doubled (Twin-PBL).

  Next, the procedure of the repair method for the bridge wall rail according to the present invention will be described with reference to FIGS.

  (1) First, the existing wall rail 13 is removed. The existing wall height column 13 is removed by cutting slightly above the pavement surface 1a of the floor slab 1 (see FIG. 5). Then, by partially removing the concrete in the cut portion by a water jet method or the like, the existing reinforcing bars arranged in the cut portion are exposed to form the reinforcing bars 3 (see FIG. 6). In this case, as the reinforcing bar 3, an existing reinforcing bar 13 a that is raised from the floor slab portion 1 and arranged in the existing wall height column 13 can be used.

  (2) Next, a plurality of L-type or C-channel type reinforcing bars 4 are connected to each reinforcing bar 3. The L-type or C-channel type rebar 4 is joined to the end of each rebar 3 via a steel sleeve 5 and is simulated on the floor slab 1 in a vertical plane perpendicular to the bridge axis of the slab 1. The rebars that are closed together are placed (see FIG. 7).

(3) Next, the precast wall height column 2 is installed as a new wall height column at the position where the existing wall height column 13 is removed (see FIG. 8). The precast wall rail 2 has a closed slab 7 that forms a rectangle projecting at the lower end thereof, and a specially laid L-type or C-channel type rebar 4 newly developed on the floor slab 1. Installed alternately in the direction of the bridge axis.
Moreover, the web part 11a of the joint 11 is inserted into the dovetail groove 10 of the precast wall height column 2 adjacent to the bridge axis direction of the floor slab part 1 (see FIG. 4). Then, a plurality of vertical reinforcing bars 8 are continuously arranged in the bridge axis direction of the floor slab portion 1 through the closed reinforcing bars 7 forming the rectangle and the L-type or C-channel type reinforcing bars 4 (see FIG. 8).

  (4) Next, the molds 13 and 13 are installed on both sides of the joint A between the floor slab 1 and each precast wall rail 2 (see FIG. 8). Then, non-shrinkable mortar 9 is placed between the molds 13 and 13. Further, a non-shrinkable mortar 12 is placed in the dovetail groove 10 at the joint B between the precast wall rails 2 adjacent to each other in the bridge axis direction.

  INDUSTRIAL APPLICABILITY The present invention can efficiently, easily and firmly replace a wall rail for the purpose of newly installing a wall rail of a road bridge or repairing and reinforcing it.

DESCRIPTION OF SYMBOLS 1 Floor slab part 2 Precast wall rail 3 Reinforcement 4 L type | mold or C channel type reinforcement 5 Steel sleeve 6 Wedge 7 Closed reinforcement which forms a rectangle 8 Vertical reinforcement reinforcement 9 Non-shrinkable mortar 10 Concave groove 11 Joint 11a Web part 12 No Shrinkable mortar 13 Existing wall rail 13a Existing rebar

Claims (4)

  Reinforcing bars and precast walls with L-type or C-channel type reinforcing bars mechanically connected to multiple reinforcing bars exposed at the upper end of the floor slab in the method of joining bridge wall rails for joining bridge rails to concrete floor slabs A non-shrinkable mortar that overlays closed reinforcing bars that form a plurality of rectangular bars that are exposed at the bottom of the railing, and that a plurality of longitudinal reinforcing bars that continue in the direction of the bridge axis are placed in these joints. A method for joining bridge wall railings comprising the process of placing the   2. The method of joining bridge wall rails according to claim 1, wherein a closed rebar that forms a rectangle is arranged at the lower end of the precast wall rail, and an L-type or C-channel type rebar is machined on the reinforcing bar exposed at the upper end of the floor slab. A method for joining bridge railings, characterized in that the bars are laid together to form a rebar joint in a rectangular shape.   3. A bridge wall rail according to claim 1 or 2, wherein a reinforcing bar formed by mechanically coupling a closed reinforcing bar and an L-type or C-channel type reinforcing bar forming a rectangular shape is joined via a steel sleeve. Joining method.   The method for joining bridge wall rails according to any one of claims 1 to 3, wherein a lower end surface of the precast wall rail is formed obliquely.

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