JP4054857B2 - Bridge cover method and cover form for use in the method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method for ground cover formed on a side end portion in the width direction of a bridge configured by laying a plurality of main girders in parallel, and a ground form frame used therefor.
[0002]
[Prior art]
The ground cover of the bridge separates the traffic of vehicles or pedestrians, and the outer edges of the bridge slab (or roadbed) in the width direction of the bridge (hereinafter referred to as “width direction”) to improve the safety of traffic for pedestrians, etc. In addition, it is an accessory structure installed along the bridge length direction (hereinafter referred to as “bridge length direction”).
[0003]
For example, in the case of the bridge B in which the platen girder is the main girder Mg, the above-mentioned ground cover is disposed on both outer sides of the main girder Mg in the bridge width direction as shown in FIG. As shown in FIG. 4B, the ground cover K is constructed by installing a square bar J1 on the lower surface of the main girder Mg using a suspension bolt J2, a pier J3, a single pipe J4, a form tie J5, a separator J6, After forming the formwork J for laying concrete by combining the plywood J7, the insert Mg1 of the main girder Mg, etc., the concrete J8 is placed, and the formwork J is dismantled after waiting for curing and curing. A cover was being formed.
[0004]
[Problems to be solved by the invention]
However, the conventional ground cover construction method has a problem that it takes a lot of work to assemble and dismantle the formwork, and the construction period becomes long.
[0005]
In addition, when the formwork is dismantled after the concrete has been placed and hardened, the ground cover has a protruding shape, so the exposed area of the outside air per unit volume of the concrete becomes relatively large and cracks are caused by drying shrinkage of the concrete. There was a problem that it was easy to occur.
[0006]
【the purpose】
Accordingly, the present invention has been made in view of the above-mentioned problems, and is intended to shorten the construction period of ground cover construction and to prevent cracking due to drying shrinkage of concrete, and the ground cover mold used for this. I will provide a.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, the bridge ground cover construction method according to the present invention is constructed as follows.
That is, the embedded reinforcement (90) embedded and supported at the outer end of the main girder (9) in the bridge width direction and exposed to the outside is arranged in advance in the bridge bridge length direction. 90), and a precast concrete panel (3 ) on the side face in the bridge width direction of a predetermined section including the embedded reinforcement (90) and the underground reinforcement (5). 4) are arranged facing each other to form the mold (2), and after the mold (2) is connected and fixed to the main beam (9) , the concrete (8) is placed in the mold (2). The ground cover (1) is formed by being cast and integrated with the mold (2).
[0008]
Moreover, the ground cover formwork used for said ground cover construction method is comprised as follows.
That is, the embedded reinforcement (90) embedded in the outer end of the main girder (9) in the bridge width direction and exposed to the outside and disposed in the bridge bridge length direction, and the embedded reinforcement (90) The main girder (9) is arranged so as to be opposed to the side face in the bridge width direction of a predetermined section including the ground reinforcement (5) connected and arranged, and the embedded reinforcement (90) and the ground reinforcement (5). ) And a precast concrete panel (3, 4) connected and fixed to the side end.
[0009]
Note that the reference numerals in parentheses described in the claims and the means for solving the problems are added with reference numerals for reference in order to facilitate understanding of the configuration of the invention. Of course, it is not limited to this form.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Below, the concrete embodiment example of the bridge ground cover construction method and ground cover formwork used therefor according to the present invention will be described in detail with reference to the drawings.
[0011]
FIG. 1 is a partially cutaway perspective view showing a bridge according to this embodiment, FIG. 2 is a cross-sectional view showing the ground cover of the bridge according to this embodiment, and FIG. 3 shows the ground of the bridge according to this embodiment. It is AA sectional view taken on the line.
[0012]
The type of the bridge B of this embodiment shown in FIG. 1 relates to a preten girder bridge manufactured in advance by pre-stressing a PC steel wire at a factory. The bridge pier is closely parallel with the preten girder as a main girder 9. A floor slab F is formed by laying on the top. And the ground cover 1 is formed in the upper surface and the side surface with respect to the main girder 9 of the outer side edge part of the width direction.
[0013]
The construction method of the ground cover 1 mainly includes a step of constructing the mold 2 by being connected and fixed to the main girder 9, and a concrete 8 is placed on the constructed mold 2 so as to be integrated with the mold 2. It consists of the process of hardening.
[0014]
The formwork 2 has a predetermined section including an embedded muscle 90 that is embedded and supported in advance by a main girder 9 disposed at an outer end portion in the width direction and exposed to the upper outside, and a ground cover muscle 5 connected thereto. The inner panel 3 and the outer panel 4, which are precast concrete panels (hereinafter abbreviated as “panels”) prepared in advance by factory production or the like, are combined and fixed to the main beam 9. Is building.
[0015]
The contact portion between the joint between the panels and the concrete 8 to be placed is filled with a sealing material 6 to prevent rainwater from entering.
[0016]
From the construction method described above, the ground cover 1 according to this embodiment includes the embedded reinforcement 90 and the ground reinforcement 5, the inner panel 3 that is connected and fixed to the main girder 9, the mold 2 that includes the outer panel 4, and the hammering The concrete 8 to be installed is a constituent element.
[0017]
The above-mentioned embedded reinforcement 90 is a reinforcing bar embedded and supported in advance in the main girder 9 so as to be exposed to the outside upward and disposed in the bridge length direction. The ground cover 1 is reinforced by these embedded bars 90 and the ground cover 5.
[0018]
Next, the inner panel 3 is a panel material arranged on the inner upper side with respect to the main girder 9, and a plurality of ridge-shaped ribs 30 with increased thickness are formed in the bridge length direction (example of this embodiment). in conjunction with two) to, and disposed muscle through a bridge length direction in the rib 30 (shown Ministry shown). Further, embedded bolts 31 are arranged on the rib 30 at a predetermined interval.
[0019]
Said outer panel 4 is a panel material arrange | positioned on the outer side surface with respect to the main girder 9, and the rib 40 similar to the inner panel 3 is formed in the upper end side at predetermined intervals in the bridge length direction ( with in the present embodiment this 3 including the position facing the rib 30 of the inner panel) to, and arranged muscle (not Ministry shown) through a bridge length direction of the ribs 40, arranged stud 41 at predetermined intervals is doing. Further, a substantially L-shaped draining portion 42 that is horizontally bent in the direction of the main girder 9 is formed on the lower end side of the outer panel 4. Further, as shown in FIG. 2, a bottom plate 43 is disposed between the draining portion 42 and the side end face of the main girder 9 so as to close the gap. The bottom plate 43 is mounted after being mounted so as to be bridged between the upper surface on the front end side of the draining portion 42 and a shoulder portion 92 having a downward slope surface formed at the lower side end surface of the main girder 9. It is fixed by an adhesive means.
The reason why the bottom plate 43 is formed separately from the outer panel 4 and attached is to absorb the attachment error of the outer panel 4 with respect to the main girder 9 and rain water flowing down through the outer panel 4. This is because the water drainage effect is prevented from being transmitted to the main girder 9.
In addition, the sealing material 6 is filled in the abutting surfaces (joints) of the bottom plates 43 which are in contact with each other and are continuous in the longitudinal direction, similarly to the joints between the panels described above.
[0020]
Finally, the inner and outer panels 3 and 4 constituting the mold 2 are connected and fixed by a connecting rod 7 that is stretched over embedded bolts 31 and 41 between the opposed panels and fixed by welding or screwing. . In addition, the above-mentioned formwork 2 itself is connected and fixed to the end portion on the main girder side by welding the insert 91 previously arranged on the side end surface of the main girder 9 and the embedded bolt 41 arranged on the outer panel 4. The connecting rod 7 is connected and fixed by The bottom plate 43 is arranged so as to be inserted from an obliquely lower side of the outer panel 4 after the inner and outer panels 3 and 4 are fixed to the main girder 9 and fixed or the like.
[0021]
【effect】
Since the bridge ground cover construction method of the present invention and the ground cover mold used for this are configured as described above, the following effects can be obtained.
[0022]
That is, since the conventional complicated formwork construction and dismantling is omitted, the construction period is shortened and the cost is reduced.
[0023]
In addition, since there is no dismantling of the formwork, dry cracking of concrete that has conventionally occurred is eliminated, and the appearance and strength are improved.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view showing a bridge according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a bridge cover of the embodiment.
FIG. 3 is a cross-sectional view taken along line AA of the bridge cover of the embodiment.
FIG. 4 is a cross-sectional view showing a conventional ground cover and a ground cover construction state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ground cover 2 Form frame 3 Inner panel 30 Rib 31 Embedded bolt 4 Outer panel 40 Rib 41 Embedded bolt 42 Drainage part 43 Bottom plate 5 Ground cover 6 Sealing material 7 Connecting rod 8 Concrete 9 Main girder 90 Embedded reinforcement 91 Insert 92 Shoulder Part B Bridge F Floor slab K Ground cover (conventional example)
Mg main girder (conventional example)
Mg1 Insert J Form J1 Square J2 Suspension bolt J3 Crosspiece J4 Single pipe J5 Form tie J6 Separator J7 Plywood J8 Concrete

Claims (2)

An embedded reinforcement (90) embedded in the outer end of the main girder (9) in the bridge width direction and exposed to the outside is disposed in advance in the bridge bridge length direction,
The ground reinforcement (5) connected to the embedded reinforcement (90) is arranged and precast on the side face in the bridge width direction of a predetermined section including the implantation reinforcement (90) and the ground reinforcement (5). The concrete panels (3, 4) are placed facing each other to form the formwork (2),
After connecting and fixing the formwork (2) to the main girder (9),
A bridge ground covering method characterized in that concrete (8) is cast in the formwork (2) and integrated with the formwork (2) to form a ground cover (1). Embedded bars (90) embedded in the outer end of the main girder (9) in the bridge width direction and exposed to the outside and disposed in the bridge bridge length direction;
A ground cover (5) connected to the embedded muscle (90),
A precast concrete panel ( positioned opposite to the side face in the bridge width direction of a predetermined section including the embedded reinforcement (90) and the ground reinforcement (5) and connected and fixed to the side end of the main girder (9) ( 3, 4)
A ground formwork used for a ground cover construction method for a bridge, characterized by comprising:

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