JPH06193014A - Execution method of bridge concrete by arched or the like formwork support - Google Patents

Abstract

PURPOSE:To strengthen aseismic property of a support at execution of a bridge concrete using a formwork support constituted of truss frame bodies. CONSTITUTION:A formwork support A constituted by combining together arched or like shaped truss frame bodies (a) is constructed, and concrete B to be placed on the formwork 4 is jointingly laced following to set divisions (b1), (b2), (b3) from both end parts to the center part. Horizontal reinforcing devices C for combining with concrete of respective lacing divisions (b1)-(b3) are provided on the support A, a connector 13 detachably fitted to each horizontal reinforcing device C is buried in concrete at placing the concrete on every placing division, and the execution is put forward while combining together the placed concrete and the support A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing bridge concrete such as arch bridge by using arch-shaped form support.

[0002]

2. Description of the Related Art In the construction of bridge concrete (arch concrete) for arch bridges, etc., in recent years, a form support method (for example, Japanese Patent Publication No.
Construction (see the official gazette) has become popular. As shown in FIGS. 1 and 2, the outline of this formwork support work is a frame structure A formed in an arch shape or the like on the leg structures 1, 1 such as abutments and piers.
Both lower ends of which are connected by pins 3 and are arranged in a row in the depth direction at a required interval. The connecting members 7 and 7 and the diagonal members 8 and 8 are connected to each other.
The structure is bound by.

Bridge concrete is formed by placing the formwork 4 on the upper surface of the formwork support A and placing the concrete, but this concrete is the entire span of the formwork except for a small one. Can't be placed at once,
For example, see Fig. 1 for the area where concrete can be placed at once.
The settings are made as b ₁ −b ₂ −b ₃ so that they are placed in sequence.

[0004]

As described above, in the construction of bridge concrete, the concrete placing for each section is repeated, so that it takes time and labor to install and remove the partition formwork each time, and the concrete placing The period will be long. In addition, recently, it is required to increase the span of bridges, and the period of concrete pouring tends to become longer and longer. In such cases, in Japan, where there are many earthquakes, it is expected that the formwork supports will be significantly deformed or broken if an earthquake occurs during construction.

It has been known that the seismic load which causes the support A as described above is a horizontal load in the width direction of the support A (direction perpendicular to the bridge axis). The horizontal load due to the earthquake is a value obtained by multiplying the weight of the object by the seismic coefficient, and if the span of the support work A becomes long, the horizontal load due to the earthquake becomes extremely large. In addition, if the span of support work A becomes longer,
Since it is a long and narrow frame, it is necessary to consider that the counterforce against horizontal load will be small and that not only horizontal load due to an earthquake but also strong crosswind may cause deformation and breakage of the support structure A. If reinforcement such as supporting work is to be carried out so as to withstand such a horizontal load, the construction cost of supporting work becomes very expensive.

The present invention has been made in view of the above circumstances, and the horizontal load in the width direction due to an earthquake or the like is not received only by the support work, but by the hardened concrete being supported by the support work. The present invention intends to provide a construction method in which the burden of horizontal load of the construction is reduced and the economical efficiency of construction is not impaired.

[0007]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments.
A plurality of truss structures a spanning the space are arranged in the width direction of the bridge concrete B to be constructed and joined to form and erection the formwork support A, and the support A is set with the bridge concrete B set. The horizontal reinforcing devices C and C provided with the connectors 13 and 13 embedded in the concrete of each of the construction sections b _{1 to} b ₃ are attached, and the concrete B and the support A that are placed in each section are connected to the connectors 13 and 13. And horizontal reinforcement device C,
It is characterized by passing over concrete.

[0008]

Since the present invention is constructed as described above, when constructing bridge concrete B by splicing it from the end to the center according to the set sections, the concrete cast in each section is , The support A and the horizontal reinforcing device C are connected. Since these concretes are integrally joined to the leg structure 1, they have a strong resistance to horizontal force due to an earthquake, etc., so that the support A depends on the resistance of the concrete. Therefore, there is no fear of deformation or destruction even in the event of an earthquake or strong wind, and construction can proceed safely and reliably.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which arch concrete is constructed by using arch-shaped frame support (hereinafter referred to as support), and FIG. 2 is a plan view showing the support. The supporting work A is installed on the leg structures 1, 1 facing each other such as bridge abutments with the lower ends of both ends pin-coupled 3, 3 via the mounting bases 2, 2.
The formwork 4 is installed on the upper surface of the supporting work A, and the arch concrete (bridge concrete) B is formed on it.

The support A is an arch-shaped truss frame structure a in which two half arch trusses 5 and 5 each having an arc shape having a length obtained by roughly dividing the span of the arch concrete B are pin-coupled 6 at their top ends. Of the arch concrete B to be constructed are arranged at intervals in the width direction (depth direction), and are connected to the leg structures 1 and 1 by pin couplings 3 and 3, respectively, and are connected to each other by connecting members 7 and 7 and diagonals. Formed by connecting the members 8 and 8, the formwork 4 is installed on the upper surface of the support A through the support members 9 and 9.

Form 4 of supporting work A installed as described above
Although the concrete B of the bridge is placed on the top, the span of the formwork cannot be placed at one time, so the range of placing concrete at one time is from the both ends of the formwork 4 to the top. , For example, as shown in FIG. 1, b ₁ , b ₁ · b ₂ , b ₂ ·
Set the droplet設区minutes to _{b 3, b 1, b 2} , so that in the order of b ₃ go on pouring. Therefore, prior to this concrete casting, the widthwise end of the concrete near each tip of the concrete placed in the other sections b ₁ and b ₂ except the section b ₃ to be finally cast On the support A at the corresponding position, the connectors 13 and 13 embedded in the concrete and the horizontal reinforcing devices C and C for detachably connecting the concrete and the support A through the connector are installed.

As shown in FIGS. 5 to 7, the horizontal reinforcing device C has one end attached to the upper chord member 20 of the arch-shaped truss frame structure a located on both outer sides of the support A by welding or the like. A mounting plate 12 that is flush with the formwork 4 set at the concrete pouring position via a pedestal 11 on a reinforcing material 10 extending in the width direction of A.
Is provided and mounting bolts 14, 14 for detachably fixing the connectors 13, 13 embedded in the concrete B to be placed on the mounting plate 12 are detachably screwed to the connector 13. ing. Further, on the mold frame 4, a hole 15 for exposing the mounting plate 12 on the mold frame 4 is provided at a position corresponding to the mounting plate 12.

The concrete B of the bridge is first cast into sections b ₁ and b ₁ corresponding to both ends of the form 4, as shown in FIG. 3, while the connectors 13 and 13 are placed in the cast concrete. Buried. Therefore, the support work A is b ₁ , b ₁ placed on both side ends thereof via the horizontal reinforcing devices C, C installed.
Will be combined with the concrete B of the section. After the concrete B is hardened, it becomes an integrated structure due to the mutual connection between the leg structure 1 and the buried reinforcing bars (not shown) and the bonding force of the concrete itself, so even if a large horizontal force due to an earthquake or the like acts, For this purpose, the concrete B combined with the supporting structure A exerts a resistance force, so that the supporting structure A can be prevented from being deformed or broken.

When the concrete placed in the sections b ₁ and b ₁ is hardened, concrete is placed in the next sections b ₂ and b ₂ as shown in FIG. Concrete B in this category
Also, in the same manner as above, the connectors 13 and 13 are buried,
The concrete B and the support A are joined by the horizontal reinforcing device, and the resistance to the horizontal force is exerted similarly to the above. After hardening of the concrete placed in sections b ₂ and b ₂ ,
Concrete is poured into the top section b ₃ located between them to form the bridge concrete B over the entire span as shown in FIG. 1.

After the construction of the bridge concrete B, the formwork 4 is peeled off from the concrete and the support A is removed. Formwork 4
Is removed from the concrete B as shown in FIG. 7 when the support tools 9 and 9 are removed and the support 9 is lowered.
Also, turn the mounting bolts 14, 14 of the horizontal reinforcing device C to remove them from the connectors 13, 13 to remove the connectors 13, 13 and the mounting plate.
Release the bond with 12. Then, the supporting work A is disassembled, or the supporting work A is moved by using an elevating device and a moving device (not shown).
Is slightly lowered and pulled out to the outside in the width direction of the bridge concrete B.

Also, in the construction by arch-shaped frame support work, for example, when the span of arch concrete becomes very large, as shown in FIG.
A pillar that connects most of 6 and 16 and stands in the ground at each intermediate position 1
The support A supported by 7 and 17 is used, but in this case also, as in the above-mentioned embodiment, the placing sections of the concrete B are set, and the concrete of these sections and the horizontal reinforcing device C are used. Then, the construction can be proceeded while the concrete B and the supporting work A are connected. Further, the shape of the bridge concrete is not limited to the arch shape, and the bridge concrete can be similarly applied.

Further, in the concrete pouring of arch concrete B, due to the large moment generated after the hardening of the concrete at both end portions b ₁ and b ₁ , it joins with the leg structure 1 as shown in FIG. required Category b _4, but b ₄ of the concrete and finally to a method of pouring is also taken, in such a case, the first pouring to segment b ₁ concrete, pre projecting leg structure 1 The construction method of the present invention can be applied by connecting the seismic-resistant structure 18 and driving it.

[0018]

As described above, according to the present invention, when bridge concrete is spliced by the set placing section, the supporting concrete and each section are struck through the horizontal reinforcement device attached to the supporting section. Since it is connected to the concrete of the installation, even if a large horizontal force due to an earthquake etc. acts during the splicing of concrete, the support work will not be deformed or deformed due to the connection with the concrete part integrated with the leg structure. You can proceed with the construction safely and securely without destroying it.
Further, it is not necessary to provide a special horizontal force resistance means in addition to the horizontal reinforcing device for the support work, and there is no fear that the construction cost for the support work will increase.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention.

FIG. 2 is a plan view of a support work according to the present invention.

FIG. 3 is a front view showing one state during construction of the present invention.

FIG. 4 is a front view showing another state.

FIG. 5 is a front view showing a mounting portion of a horizontal reinforcing device.

FIG. 6 is a side view of the same.

FIG. 7 is a front view showing a state at the same point when the mold is peeled off.

FIG. 8 is a schematic front view showing another embodiment of the present invention.

FIG. 9 is a schematic front view showing still another embodiment.

[Explanation of symbols]

 A Form supporting work B Bridge concrete C Horizontal reinforcement device 1 Leg structure a Arch truss frame structure 4 Formwork 7 Connecting material 9 Supporting tool 10 Reinforcing material 11 Pedestal 12 Mounting plate 13 Connector 14 Mounting bolt 15 Hole

Claims (1)

[Claims] A plurality of truss structures that span the leg structures of the bridge are arranged in the width direction of the bridge concrete to be constructed and joined to form and erection the formwork support, and the bridge concrete was set for the support. Attach a horizontal reinforcement device with a connector embedded in each concrete of the placement section, and connect the concrete and the support work placed in each section by the connector and the horizontal reinforcement device and connect the concrete. A feature of this method is the construction of bridge concrete by arch-shaped form support.