JP7221775B2 - Joining structure and joining method of precast wall balustrade - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a joint structure and a joint method for precast balustrades that are joined to a deck slab of a bridge.

Bridges are generally provided with wall balustrades at both ends of the floor slab in the width direction (direction parallel to the bridge surface and perpendicular to the bridge axis). In recent years, for the purpose of shortening the construction period, etc., a construction method has been adopted in which the wall balustrade is made of precast concrete in advance, and after the precast floor slab is erected, the precast wall balustrade is placed on the floor slab and joined to the floor slab. there is As such a joint structure between precast floor slabs and precast wall balustrades, loop-shaped reinforcing bars are provided at the joints, and after adjusting the height of the wall balustrades, non-shrinking mortar is filled and integrated (DAK method wall balustrade) are known. In addition, there is a joint structure (trunc-head construction method wall balustrade) that uses non-shrinking mortar to fix the rebar tip to a truncated cone shape by forging at the joint between the ground guard and the adjacent wall balustrade. It is publicly known (see Patent Document 1).

In addition, in order to increase the joint strength of the wall balustrade, epoxy resin or resin mortar is filled as an adhesive resin between the fixing part of the anchor reinforcing bar, the fixing part of the continuous fiber reinforcing material, and the joint surface of the precast member (patented Documents 2, 3) are known.

JP 2018-141341 A Japanese Unexamined Patent Application Publication No. 2018-112009 JP 2018-193709 A

In the construction method that uses non-shrinkage mortar for joints, it is necessary to cure the mortar until it develops a certain strength, and the traffic regulation period is long. In addition, deterioration factors such as chlorides may enter from the non-shrinking mortar portion, which is a weak point in terms of durability. On the other hand, by using epoxy resin or resin mortar for joints, curing can be completed in a few hours, so it is possible to shorten the period of traffic restrictions and improve durability.

However, when the handrail is placed and fixed on the floor slab after the precast floor slab is erected, much of the work must be done on the precast floor slab that has been erected at a predetermined position, and it takes time from erection of the precast floor slab to opening to traffic. time cannot be shortened. It is possible to shorten the time from erection of precast floor slabs to traffic opening by joining precast wall balustrades to precast floor slabs before erecting precast floor slabs. Unable to align balustrades after erection.

In view of such a background, an object of the present invention is to provide a joining structure and a joining method of precast wall balustrades that can align wall balustrades and shorten the period of traffic regulation.

In order to solve such problems, an embodiment of the present invention provides a joint structure for precast wall balustrades, which comprises: a floor slab (2) or a guard (4) provided on the floor slab; A precast wall balustrade (1) having a precast floor slab (3) formed with a receiving hole (16) directed toward a concrete portion (6) and a longitudinal anchoring bar (9) protruding downward from the lower end of said concrete portion. ), and a state in which the vertical anchoring bar protrudes into the receiving hole and a gap (G) is formed between the concrete portion and the floor slab or the lining. and a support device (20) for supporting the precast wall balustrade member, the support device having a position adjustment mechanism (25) capable of adjusting the position of the precast wall balustrade member with respect to the precast floor slab.

According to this configuration, the precast wall balustrade member can be temporarily fixed to the precast floor slab by the supporting device before the precast floor slab is erected at the predetermined position. This reduces the amount of work to be done on the precast floor slab erected at a predetermined position, so that the time required from erection of the precast floor slab to opening to traffic can be shortened. Further, after the precast floor slabs are erected at a predetermined position, the position of the precast wall balustrade members can be aligned by the position adjusting mechanism.

In the above configuration, the position adjustment mechanism (25) adjusts the position of the precast wall balustrade member (1) in the bridge width direction, the inclination of the precast wall balustrade member around an axis parallel to the bridge axis, and the precast wall balustrade member. at least one of the streets along the bridge axis of the bridge can be adjusted.

According to this configuration, after the precast floor slabs are erected at a predetermined position, the precast wall balustrade member can be adjusted to an appropriate position (position in the width direction of the bridge, falling or alignment).

In the above configuration, the joint structure of the precast wall balustrade includes heating means (8B, 34, 41). The term "resin material" as used herein includes resin mortar obtained by mixing aggregate, fiber reinforcing material, and the like into resin.

According to this configuration, the uncured thermosetting resin material can be placed in the receiving holes and the gaps before the precast floor slab is erected, and the work to be done on the erected precast floor slab is further reduced. Therefore, it is possible to further shorten the time required from erection of the precast floor slabs to opening to traffic. Even if the resin material is placed before the precast floor slab is erected, it is possible to adjust the position of the precast wall balustrade member after the precast floor slab is erected, as long as the resin material is uncured. In addition, since the resin material does not harden until it is heated, it is possible to construct a wide area at once. Furthermore, since the resin material can be hardened by heating the resin material with a heating means, curing can be completed in a short time compared to the case of using a cement-based binding material, and the traffic regulation period can be further shortened. be.

In the above configuration, the heating means includes a reinforcing bar (8B) that contacts the vertical anchoring bar, and a power supply (34) that causes the reinforcing bar and the vertical anchoring bar to generate heat by applying an electric current to the reinforcing bar. good.

According to this configuration, since the resin material can be heated using the reinforcing bars, the configuration of the heating means is simple.

In the above configuration, the heating means includes a heating wire (41) arranged along the vertical fixing bar (9) and the gap (G), and the heating wire is heated by applying an electric current to the heating wire. and a power source (34) for generating heat.

According to this configuration, the resin material arranged in the receiving hole and the gap can be reliably heated by the heating wire.

In order to solve the above problems, an embodiment of the present invention is a method for joining precast wall balustrades, comprising a concrete part (6) and a vertical fixing bar (9) projecting downward from the lower end of the concrete part. ), and a precast receiving hole (16) extending downward from the upper surface of the floor slab (2) or the lining (4) provided on the floor slab. providing a floor slab (3); and placing said precast wall balustrade member on said floor slab or said ground covering with a gap (G) therebetween such that said longitudinal anchor bars project into said receiving holes. a temporary fixing step of temporarily fixing the precast wall balustrade member on the precast floor slab using a support device (20) attached to the floor slab or the ground guard; a floor slab erecting step of erecting a precast floor slab at a predetermined position; and operating a position adjusting mechanism (25) provided in the support device at the predetermined position to precast the precast wall balustrade member temporarily fixed. A position adjustment step of adjusting a position with respect to the floor slab, and a final fixing step of fixing the position-adjusted precast wall balustrade member to the precast floor slab.

According to this configuration, since the precast wall balustrade member is temporarily fixed on the precast floor slab before the precast floor slab is erected at the predetermined position, the work to be done on the precast floor slab erected at the predetermined position is reduced. As a result, the time required from erection of the precast floor slabs to opening to traffic can be shortened. Further, after the precast floor slabs are erected at a predetermined position, the position of the precast wall balustrade members can be aligned by the position adjustment mechanism.

In the above configuration, in the position adjusting step, the position of the precast wall balustrade member (1) in the bridge width direction, the inclination of the precast wall balustrade member around an axis parallel to the bridge axis, and the bridge axis of the precast wall balustrade member should adjust at least one of the streets along

According to this configuration, after the precast floor slab to which the precast wall balustrade member is temporarily fixed is erected at a predetermined position, the precast wall balustrade member can be adjusted to an appropriate position (position in the bridge width direction, collapse or alignment). .

In the above configuration, the method of joining the precast wall balustrade is such that the receiving hole (16) is filled and the upper surface of the floor slab (2) or the guard (4) is in contact with the concrete portion (6). It further comprises a resin placing step of placing an uncured thermosetting resin material (17) in the balustrade joint portion, and in the final fixing step, the resin material is heated by heating means (8B, 34, 41) to By curing the resin material, the position-adjusted precast wall balustrade member (1) is fixed to the precast floor slab (3), and the resin placement step is preferably performed before the floor slab erection step. .

According to this configuration, before the precast floor slab is erected, the uncured thermosetting resin material is placed on the balustrade joint on the upper surface of the floor slab or the ground covering, so that the precast floor slab erected at a predetermined position less work to do in As a result, it is possible to further shorten the time required from erection of the precast floor slabs to opening to traffic. In addition, since the uncured thermosetting resin material is placed in the receiving holes and gaps, even if the resin material is placed before the precast floor slabs are erected, the precast wall balustrade members will not be positioned after the precast floor slabs are erected. can be adjusted. In addition, since the resin material does not harden until it is heated, it is possible to construct a wide area at once. Furthermore, since the resin material can be hardened by heating the resin material with a heating means, curing can be completed in a short time compared to the case of using a cement-based binding material, and the traffic regulation period can be further shortened. be.

In the above configuration, in the main fixing step, it is preferable to cause the reinforcing bar and the vertical fixing bar to generate heat by applying an electric current to the reinforcing bar (8B) in contact with the vertical fixing bar (9).

According to this configuration, since the resin material can be heated using the reinforcing bar, there is no need to provide a dedicated member for heating the resin material, and the preparatory work for heating the resin material is simple. .

In the above configuration, in the main fixing step, a current is passed through the heating wire (41) arranged along the vertical fixing bar (9) and the gap (G), thereby causing the heating wire to generate heat. Good.

According to this configuration, the resin material arranged in the receiving hole and the gap can be reliably heated by the heating wire.

As described above, according to the present invention, it is possible to provide a joining structure and a joining method of precast wall balustrades that can align wall balustrades and shorten the period of traffic regulation.

Cross-sectional view of the joint structure of the precast wall balustrade according to the first embodiment View from arrow II in Fig. 1 Sectional drawing which shows the joining method of the precast wall balustrade which concerns on 1st Embodiment Sectional drawing which shows the joining method of the precast wall balustrade which concerns on 1st Embodiment Cross-sectional view of the joint structure of the precast wall balustrade according to the second embodiment

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<<First embodiment>>
First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. FIG. 1 is a cross-sectional view of a joint structure of precast wall balustrades according to the first embodiment. As shown in Fig. 1, a precast wall balustrade member 1 in a bridge is perpendicular to the axis of the floor slab 2 and parallel to the bridge surface (hereinafter referred to as the width direction). 4 are joined.

The floor slab 2 is constructed by laying a plurality of precast floor slabs 3 made of precast concrete members side by side in the bridge axis direction and joining them together. Each precast floor slab 3 has a length of about 2 to 3 m in the direction of the bridge axis, and is manufactured in advance at a precast factory and brought to the site. The covering 4 is preferably a factory secondary product. The cover 4 is formed by pouring concrete so as to bury the exposed portions of the joint reinforcing bars 5 embedded in the precast floor slab 3 . The covering 4 is formed to protrude upward from the side edge of the precast floor slab 3 . In other embodiments, the covering 4 may be integrally formed at the same time as the precast floor slab 3 .

Hereinafter, the precast floor slab 3 and the ground guard 4 integrated together will be referred to as the precast floor slab 3 . In addition, the precast floor slab 3 may be manufactured in the yard of the construction site. Also, the precast floor slab 3 may be prestressed concrete or reinforced concrete.

The precast wall balustrade member 1 has substantially the same length in the bridge axis direction as the precast floor slab 3 . The precast wall balustrade member 1 is arranged above the ground covering 4 with a gap G therebetween, and joined to the ground covering 4 and other precast wall balustrade members 1 adjacent in the bridge axis direction. The precast wall balustrade member 1 includes a concrete portion 6, a plurality of longitudinal rebars 7 extending in a direction orthogonal to the bridge axis, and a plurality of lateral rebars 8 (8A, 8B) extending in the bridge axis direction. have.

The plurality of longitudinal reinforcing bars 7 includes longitudinal anchor bars 9 (9A, 9B) projecting downward from the bottom edge of the concrete portion 6. As shown in FIG. The plurality of vertical anchoring bars 9 protrude downward from the plurality of first vertical anchoring bars 9A arranged on the outside in the width direction and the concrete portion 6 on the inner side in the width direction of the first vertical anchoring bars 9A. and a plurality of second longitudinal anchor bars 9B. It is preferable that the first vertical anchoring bar 9A and the second vertical anchoring bar 9B are alternately arranged at positions shifted along the bridge axis direction.

Each first vertical fixing bar 9A has a linear shape extending along the vertical direction over the entire length. Each second vertical anchoring bar 9B is curved at the top, and is arranged to surround the first vertical anchoring bar 9A along the outer side surface, top surface, and inner side surface of the portion embedded in the concrete portion 6. It is It is preferable to provide a U-shaped reinforcing bar 10 opening upward at the lower portion of the concrete portion 6 of the precast wall balustrade member 1 . The reinforcing bar 10 is arranged so as to connect the lower side of the inner portion and the outer portion in the width direction of the second vertical anchoring bar 9B, and is installed inside the concrete portion 6 in cooperation with the second vertical anchoring bar 9B. Form a loop-shaped rebar.

A fixing member 11 for mechanical fixing is provided at the lower end of the fixing bar 9 in the vertical direction. The fixture 11 for mechanical fixing is provided at the end of the reinforcing bar in order to transmit the tensile force acting on the reinforcing bar to the concrete in mechanical fixing. It means a large plate-like or hump-like thing of The fixing member 11 preferably has a hump shape, and more preferably has a truncated cone shape with the tip side narrower than the rear end side as shown in the figure. The fixing member 11 has a shape in which the cross-sectional area of the rear end side is larger than the cross-sectional area of the intermediate portion of the reinforcing bar in a cross section orthogonal to the extending direction of the reinforcing bar, and a shoulder that expands in a circular shape at the rear end. forms a surface.

Each transverse reinforcing bar 8 is arranged along the longitudinal reinforcing bars 7 so as to extend in the direction of the bridge axis. The plurality of lateral reinforcing bars 8 are composed of a plurality of first lateral reinforcing bars 8A wholly embedded in the concrete portion 6 of the precast wall balustrade member 1 and second lateral reinforcing bars 8B at least partially exposed from the concrete portion 6. contains. In this embodiment, two second horizontal reinforcing bars 8B that are entirely exposed from the concrete portion 6 are placed above the portions of the first vertical anchoring bar 9A and the second vertical anchoring bar 9B that are exposed from the concrete portion 6. are placed along. Each second transverse reinforcing bar 8B contacts a corresponding plurality of first longitudinal anchor bars 9A or a plurality of second longitudinal anchor bars 9B. Each second lateral reinforcing bar 8B may be arranged at the time of production of the precast wall balustrade member 1, or may be arranged after production.

In other embodiments, the second transverse reinforcing bars 8B may be embedded in the concrete portion 6 and have exposed ends. In this case, the second transverse reinforcing bars 8B contact a corresponding plurality of first longitudinal anchor bars 9A or a plurality of second longitudinal anchor bars 9B inside the concrete portion 6 . When one second horizontal reinforcing bar 8B is provided, both ends of the second horizontal reinforcing bar 8B are arranged so as to be exposed from the concrete portion 6 . If a plurality of second horizontal reinforcing bars 8B can be received, the ends of at least one second horizontal reinforcing bar 8B may be exposed from both end surfaces of the concrete portion 6 in the bridge axis direction.

Moreover, the plurality of lateral reinforcing bars 8 may include a plurality of lateral anchoring bars protruding from one end face of the concrete portion 6 in the bridge axis direction. A plurality of lateral anchor bars are utilized for joining with other adjacent precast wall balustrade members 1 . The plurality of lateral anchoring muscles are arranged, for example, along the first vertical anchoring muscles 9A. If the precast wall balustrade member 1 is provided with a plurality of transverse anchor bars, the other end face of the concrete portion 6 of the precast wall balustrade member 1 is provided with holes or vertical grooves for receiving the transverse anchor bars. A fixing member 11 similar to the vertical fixing bar 9 may be provided at the protruding end of each horizontal fixing bar.

A plurality of receiving holes 16 opened upward are formed in the upper surface of the ground cover 4 to receive a plurality of vertical anchoring bars 9 . Each receiving hole 16 is a bottomed hole that extends vertically and extends downward from the upper surface of the ground cover 4 . The lower end of each vertical anchoring bar 9 is inserted into a corresponding receiving hole 16 filled with an uncured thermosetting resin material 17, and the resin material 17 is cured by heating, and is pushed through the receiving hole 16. It is anchored on the cover 4. The receiving hole 16 is preferably formed as a box-cut hole, the inner surface of which is preferably helically threaded to enhance adhesion of the resin material 17 . In addition, although it is preferable that one receiving hole 16 receives the lower end of one vertical fixing bar 9 , the receiving hole 16 is an elongated hole, and a plurality of vertical fixing bars 9 can be accommodated in one receiving hole 16 . A lower end may be received.

The resin material 17 may consist of only a thermosetting resin, or may be a resin mortar obtained by mixing an aggregate, a fiber reinforcing material, or the like into a thermosetting resin. As the thermosetting resin, for example, epoxy resin, phenol resin, melamine resin, unsaturated polyester resin (vinyl ester resin), composite materials thereof, and the like can be used.

A thermosetting resin material 17 is also arranged between the upper surface of the ground cover 4 and the lower surface of the concrete portion 6 . The resin material 17 is laid (arranged) generally flat on the upper surface of the ground cover 4 , that is, on the balustrade joint portion of the precast floor slab 3 using a trowel so as to fill the receiving hole 16 . At this time, a formwork for the resin material 17 may be provided along the periphery of the top surface of the ground cover 4 . In this state, the precast wall balustrade member 1 lifted by a crane descends, so that the plurality of vertical anchoring bars 9 enter corresponding receiving holes 16, and the lower surface of the concrete part 6 contacts the resin material 17.例文帳に追加Alternatively, after the precast wall balustrade member 1 is lowered and arranged at a predetermined position, the resin material 17 may be filled in the gap G between the ground cover 4 and the concrete portion 6 by injection.

In this state, the precast wall balustrade member 1 is not fixed, and when a load is applied to the resin material 17, the resin material 17 is pushed out sideways from the upper surface of the ground covering 4.例文帳に追加Therefore, a support device 20 is attached to the precast floor slab 3 to support the precast wall balustrade member 1 while maintaining the gap G between the concrete portion 6 and the ground covering 4 .

Two pairs of supporting devices 20 are provided on one side (hereinafter referred to as the front side) and the other side (hereinafter referred to as the rear side) in the extending direction (bridge axis direction) of the precast wall balustrade member 1 . Each support device 20 is composed of an outer support unit 21 provided outside the precast wall balustrade member 1 in the width direction and an inner support unit 22 provided inside the precast wall balustrade member 1 in the width direction. The outer support unit 21 and the inner support unit 22 are different in that they are shaped to match the shape of the ground covering 4 and the concrete portion 6, and are common in other respects. Therefore, the common parts of both are given common reference numerals, and below, the outer support unit 21 will be described in detail as a representative of both.

FIG. 2 is a view in the direction of arrow II in FIG. As shown in FIGS. 1 and 2, the outer support unit 21 comprises a first support member 23 attached to the deck covering 4, a second support member 24 attached to the precast wall balustrade member 1, and a first support member 23. and a position adjustment mechanism 25 provided between the second support member 24 and the second support member 24 . The first support member 23 is fixed by a bolt to an insert nut 26 provided on the ground covering 4 . The second support member 24 is fixed by a bolt to an insert nut 26 provided on the precast wall balustrade member 1 . The first support member 23 has an upper flange 28 parallel to the horizontal or bridge plane and the second support member 24 has a lower flange 29 parallel to the horizontal or bridge plane.

The position adjustment mechanism 25 includes a slider 30 slidably provided on the upper flange 28, a horizontal adjustment bolt 31 attached to the upper flange 28 so as to be horizontally movable in the width direction, and a lower flange vertically movable. 29 and a vertical adjustment bolt 32 attached thereto. The tip of the horizontal adjustment bolt 31 and the tip of the vertical adjustment bolt 32 are connected to the slider 30 so as to be rotatable about the bolt axis. The position adjusting mechanism 25 also includes fixing bolts 33 that pass through the upper flange 28 and the lower flange 29 and vertically sandwich the upper flange 28 and the lower flange 29 in cooperation with nuts.

By advancing and retreating the horizontal adjustment bolts 31 of the outer support unit 21 and the inner support unit 22 in the same direction to one of the left and right sides, the precast wall balustrade member 1 is displaced in the width direction with respect to the ground covering 4 . By moving the vertical adjustment bolts 32 of the outer support unit 21 and the inner support unit 22 forward and backward in the same direction, the precast wall balustrade member 1 is vertically displaced with respect to the ground covering 4 . In addition, by moving the vertical adjustment bolts 32 of the outer support unit 21 and the inner support unit 22 in opposite directions, the inclination of the precast wall balustrade member 1 around the axis parallel to the bridge axis is changed. On the other hand, the outer and inner horizontal adjustment bolts 31 of the front support device 20 are advanced and retracted in the same direction to one of the left and right sides, and the outer and inner horizontal adjustment bolts 31 of the rear support device 20 are moved in the same direction to the other of the left and right sides. By advancing and retreating, the path of the precast wall balustrade member 1 along the bridge axis changes.

The precast wall balustrade member 1 is placed on the ground by the support device 20 constructed in this way, with the vertical anchoring bars 9 protruding into the receiving holes 16 and the concrete portion 6 forming a gap G between the concrete portion 6 and the ground covering 4 . It is supported (temporarily fixed) on the cover 4 so that its position can be adjusted.

Therefore, it is possible to temporarily fix the precast wall balustrade member 1 to the precast floor slab 3 by the support device 20 before the precast floor slab 3 is erected at a predetermined position. As a result, the work to be done on the precast floor slab 3 erected at a predetermined position is reduced, and the time required from erection of the precast floor slab 3 to opening to traffic is shortened. Further, since the support device 20 has the position adjustment mechanism 25, the precast wall balustrade member 1 can be aligned by the position adjustment mechanism 25 after the precast floor slab 3 is erected at a predetermined position.

The position adjustment mechanism 25 of the present embodiment adjusts the position of the precast wall balustrade member 1 in the bridge width direction, the inclination of the precast wall balustrade member 1 around the axis parallel to the bridge axis, and the alignment of the precast wall balustrade member 1 along the bridge axis. The position is adjustable. However, the position adjustment mechanism 25 only needs to be able to adjust at least one of them. With this configuration, after the precast floor slabs 3 are erected at a predetermined position, the precast wall balustrade member 1 can be adjusted to an appropriate position (position in the bridge width direction, tilt or alignment) in a state where the resin material 17 is arranged. .

An uncured thermosetting resin material 17 is placed in the receiving hole 16 and the gap G, and the resin material 17 is heated by a heating means. In this embodiment, the heating means is provided by a second horizontal reinforcing bar 8B in contact with the vertical anchoring bar 9 and a power source 34 (FIG. 4) for applying current to a cable connected to both ends of the second horizontal reinforcing bar 8B by connectors. is configured. When the power supply 34 supplies an electric current to the second lateral reinforcing bars 8B, the second lateral reinforcing bars 8B generate heat due to electrical resistance. Further, the vertical fixing streaks 9 generate heat by electric resistance or are heated by heat conduction. Thereby, the resin material 17 is heated and cured.

Therefore, the uncured thermosetting resin material 17 can be arranged in the receiving hole 16 and the gap G before the precast floor slab 3 is erected. As a result, the work to be done on the precast floor slab 3 erected at a predetermined position is reduced, so that the time required from erection of the precast floor slab 3 to opening to traffic can be further shortened. In addition, since the uncured thermosetting resin material 17 is arranged in the receiving hole 16 and the gap G, even if the resin material 17 is arranged before the precast floor slab 3 is erected, It is possible to adjust the position of the precast wall balustrade member 1 . In addition, since the resin material 17 does not harden until it is heated, it is possible to construct a wide area at once. Furthermore, since the resin material 17 can be hardened by heating the resin material 17 with the heating means, curing can be completed in a short time compared to the case of using a cement-based binding material, and the traffic regulation period can be shortened. be.

Further, in the present embodiment, since the resin material 17 can be heated using the second lateral reinforcing bars 8B, the configuration of the heating means is simple.

Next, with reference to FIG.3 and FIG.4, the construction procedure of the joint structure of the precast wall balustrade which concerns on 1st Embodiment is demonstrated. 3 and 4 show the construction procedure in a cross-sectional view orthogonal to the bridge axis.

First, as shown in FIG. 3A, a precast floor slab 3 and a precast wall balustrade member 1 are manufactured (prepared) as precast members. The covering 4 is integrally formed to be joined to the precast floor slab 3 as a factory secondary product. The precast floor slabs 3 and the precast balustrade members 1 are transported to the construction site.

Next, a resin disposing step and a temporary fixing step shown in FIG. 3(B) are performed. That is, as shown in FIG. 3(B), the precast wall balustrade member 1 is temporarily fixed to a predetermined position on the precast floor slab 3 in the vicinity of the erection position at the construction site, and the state shown in FIG. 1 is obtained. Specifically, in the resin placement step, uncured thermosetting resin is applied to the balustrade joints on the upper surface of the undercover 4 so as to fill the receiving holes 16 formed downward from the upper surface of the undercover 4 . A resin material 17 is arranged. At this time, a formwork for the resin material 17 may be provided along the peripheral edge of the top surface of the ground covering 4 . In the temporary fixing step, the precast wall balustrade member 1 is placed on and attached to the covering 4 such that the longitudinal anchoring bars 9 protrude into the receiving holes 16 and the concrete portion 6 contacts the resin material 17. The precast wall balustrade member 1 is temporarily fixed using the supporting device 20. Either the resin placing step or the temporary fixing step may be performed first.

Next, the floor slab construction step shown in FIG. 3(C) is performed. Specifically, the precast floor slab 3 to which the precast wall balustrade member 1 is temporarily fixed is lifted by a crane and erected at a predetermined construction position (hereinafter simply referred to as a predetermined position) on the bridge girder.

Next, the position adjustment step shown in FIG. 4(D) is performed. In the position adjustment step, the position adjustment mechanism 25 provided in the support device 20 is operated at a predetermined position to adjust the position of the temporarily fixed precast wall balustrade member 1 with respect to the precast floor slab 3 . Specifically, at least one of the position of the precast wall balustrade member 1 in the bridge width direction, the inclination of the precast wall balustrade member 1 around the axis parallel to the bridge axis, and the street along the bridge axis of the precast wall balustrade member 1 adjust.

As a result, even if the position of the precast wall balustrade member 1 is deviated from the proper position when the precast floor slab 3 is erected at a predetermined position, the precast wall balustrade member 1 can be placed at the proper position (position in the bridge width direction, collapse or street). That is, the position of the precast wall balustrade member 1 can be adjusted in a state where the resin material 17 is arranged after the precast floor slab 3 is erected at a predetermined position.

Next, the main fixing step shown in FIG. 4(E) is performed. In this fixing step, the resin material 17 is heated by the heating means to harden the resin material 17 , and the precast wall balustrade member 1 whose position has been adjusted is fixed to the precast floor slab 3 . Specifically, a cable connected to a power supply 34 prepared on the floor slab 2 is connected to both ends of the second horizontal reinforcing bar 8B by a connector, and the power supply 34 is operated to contact the vertical fixing bar 9. An electric current is applied to the second lateral reinforcing bar 8B. As a result, the second horizontal reinforcing bars 8B and the vertical fixing bars 9 generate heat to heat the resin material 17 . The precast floor slabs 3 and the precast wall balustrade members 1 adjacent to each other along the bridge axis direction are joined to each other by a known appropriate method.

In the present embodiment, since the second horizontal reinforcing bar 8B and the vertical fixing bar 9 are caused to generate heat by applying a current to the second horizontal reinforcing bar 8B that contacts the vertical fixing bar 9, the resin material 17 is heated. There is no need to provide a dedicated member, and the preparatory work for heating the resin material 17 is simple.

Finally, the support device removal step shown in FIG. 4(F) is performed. In the support device removal step, the support device 20 is removed after the precast wall balustrade member 1 is fixed to the precast floor slab 3 by curing the resin material 17 . Thereby, the joining work of the precast wall balustrade member 1 is completed.

Since the temporary fixing step shown in FIG. 3(B) is performed before the floor slab erection step shown in FIG. 3(C), the work ( The work after FIG. 4(D)) is reduced. As a result, the time required from erection of the precast floor slabs 3 to opening to traffic is shortened. Further, after the precast floor slabs 3 are erected at a predetermined position, the precast wall balustrade member 1 can be aligned by the position adjustment mechanism 25 in the position adjustment step shown in FIG. 4(D).

Further, in this embodiment, before the floor slab erection step of FIG. Alternatively, an uncured thermosetting resin material 17 is arranged on the balustrade joint portion on the upper surface of the ground covering 4 . Therefore, the work (work after FIG. 4(D)) to be performed on the precast floor slab 3 erected at a predetermined position is further reduced. As a result, the time required from erection of the precast floor slabs 3 to opening to traffic can be further shortened. In addition, since the uncured thermosetting resin material 17 is arranged in the receiving hole 16 and the gap G, even if the resin material 17 is arranged before the precast floor slab 3 is erected, it will not be as shown in FIG. 4(D). It is possible to adjust the position of the precast balustrade member 1 in a position adjustment step. Moreover, since the resin material 17 does not harden until it is heated, it may be applied over a wide range (a plurality of spans) at once. Furthermore, since the resin material 17 can be hardened by heating the resin material 17 with the heating means, curing can be completed in a short time compared to the case of using a cement-based binding material, and the traffic regulation period can be shortened. be.

<<Second embodiment>>
Next, a second embodiment of the present invention will be described with reference to FIG. In addition, since the support device 20 is the same as that of the first embodiment, illustration and description thereof are omitted. Also, members identical or similar to those of the first embodiment are denoted by the same reference numerals, and overlapping descriptions are omitted. As for the joining method of the precast wall balustrade member 1, only points different from the first embodiment will be described.

FIG. 5 is a cross-sectional view of the joint structure of the precast wall balustrade member 1 according to the second embodiment. As shown in FIG. 5, this embodiment differs from the first embodiment in heating means for heating the resin material 17 . A specific description will be given below. In this embodiment, instead of providing the second horizontal reinforcing bar 8B, an electric wire is provided around the gap G between the ground cover 4 and the concrete portion 6 and the exposed lower portion of the vertical anchoring bar 9 (inside the receiving hole 16). A heating wire 41 is provided. The heating wire 41 is a heating wire that generates heat by Joule heat due to electrical resistance, and is composed of, for example, a nickel-chromium wire (nichrome wire) or an iron-chromium wire.

The heating wire 41 is arranged along the vertical fixing bar 9 and the gap G, and both ends thereof are drawn out. One heating wire 41 is preferably provided for one precast wall balustrade member 1, but a plurality of heating wires 41 may be provided. A heating means is constituted by the heating wire 41 and a power supply 34 (FIG. 4) for supplying a current to the heating wire 41 . In the main fixing step of FIG. 4(E) , the power supply 34 causes the heating wire 41 to flow current, so that the heating wire 41 generates heat due to electrical resistance. Further, the vertical fixing streaks 9 generate heat by electric resistance or are heated by heat conduction. Thereby, the resin material 17 is heated and cured. In this embodiment, the resin material 17 arranged in the receiving hole 16 and the gap G can be reliably heated by the heating wire 41 .

Although the specific embodiments have been described above, the present invention is not limited to the above embodiments and can be widely modified. For example, in the above-described embodiment, the second horizontal reinforcing bars 8B and the heating wire 41 that generate heat when energized from the power supply 34 are used as the heating means. heat may be applied to the resin material 17 by . In addition, the specific configuration, arrangement, quantity, material, work procedure, etc. of each member and part can be changed as appropriate within the scope of the present invention. Also, the above embodiments can be combined as appropriate. On the other hand, not all of the components shown in the above embodiments are essential, and can be selected as appropriate.

1 precast wall balustrade member 2 floor slab 3 precast floor slab 4 ground cover 6 concrete portion 7 longitudinal reinforcing bar 8 horizontal reinforcing bar 8A first horizontal reinforcing bar 8B second horizontal reinforcing bar (heating means)
9 longitudinal anchoring bar 9A first longitudinal anchoring bar 9B second longitudinal anchoring bar 11 anchor 16 receiving hole 17 resin material 20 support device 21 outer support unit 22 inner support unit 23 first support member 24 second support member 25 Position adjustment mechanism 34 Power supply (heating means)
41 heating wire (heating means)
G Gap

Claims (8)

A joint structure of precast wall balustrades,
a floor slab or a precast floor slab formed with receiving holes extending downward from the upper surface of a covering provided on the floor slab;
a precast wall balustrade member having a concrete section and a longitudinal anchor bar projecting downwardly from the lower edge of the concrete section;
The precast wall balustrade member is attached to the floor slab or the lining, with the longitudinal anchoring bar projecting into the receiving hole and the concrete portion forming a gap with the floor slab or the lining. a support device for supporting the precast floor slab,
The support device has a position adjustment mechanism capable of adjusting the position of the precast wall balustrade member with respect to the precast floor slab ,
Precast, wherein the position adjustment mechanism is configured to be able to adjust at least one of the position of the precast wall balustrade member in the bridge width direction and the alignment of the precast wall balustrade member along the bridge axis. Joint structure of wall balustrade. The joint structure of precast wall balustrades according to claim 1, further comprising heating means for heating the uncured thermosetting resin material arranged in the receiving hole and the gap. 3. The heating means according to claim 2 , wherein the heating means includes a reinforcing bar that contacts the vertical anchoring bar, and a power source that causes the reinforcing bar and the vertical anchoring bar to generate heat by applying an electric current to the reinforcing bar. Joint structure of precast wall balustrade. 3. The heating means includes a heating wire arranged along the vertical fixing streak and the gap, and a power source for causing the heating wire to generate heat by applying an electric current to the heating wire. 2. The joint structure of the precast wall balustrade according to 2 . A method for joining precast wall balustrades, comprising:
providing a precast wall balustrade member having a concrete section and longitudinal anchor bars projecting downwardly from the lower edge of the concrete section;
preparing a floor slab or a precast floor slab formed with a receiving hole extending downward from the upper surface of a covering provided on the floor slab;
A support device in which the precast wall balustrade member is arranged with a gap on the floor slab or the ground covering so that the vertical anchoring bar protrudes into the receiving hole, and is attached to the floor slab or the ground covering. a temporary fixing step of temporarily fixing the precast wall balustrade member on the precast floor slab,
a floor slab erecting step of erecting the precast floor slab to which the precast wall balustrade member is temporarily fixed, at a predetermined position;
a position adjustment step of adjusting the position of the temporarily fixed precast wall balustrade member with respect to the precast floor slab by operating a position adjustment mechanism provided in the support device at the predetermined position;
a final fixing step of fixing the position-adjusted precast wall balustrade member to the precast floor slab ,
A method for joining precast wall balustrades, wherein in the position adjusting step, at least one of a position of the precast wall balustrade member in the bridge width direction and a line along the bridge axis of the precast wall balustrade member is adjusted. . Further comprising a resin placing step of placing an uncured thermosetting resin material on the balustrade joint portion of the upper surface of the floor slab or the ground guard so that the receiving hole is filled and the concrete portion is in contact,
In the final fixing step, the resin material is heated by a heating means to harden the resin material, thereby fixing the position-adjusted precast wall balustrade member to the precast floor slab,
6. The method for joining precast wall balustrades according to claim 5 , wherein the resin placing step is performed before the floor slab erecting step. 7. The method for joining precast wall balustrades according to claim 6 , wherein in the final fixing step, a current is passed through a reinforcing bar in contact with the vertical fixing bar to generate heat in the reinforcing bar and the vertical fixing bar. 7. The precast wall according to claim 6 , wherein in the final fixing step, a current is passed through a heating wire arranged along the vertical fixing bars and the gap to generate heat in the heating wire. How to join balustrades.

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