JP3759101B2 - Formwork support structure and concrete construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a formwork support structure and a concrete construction method used when a steel girder subjected to vibration, such as a bridge girder in a currently used bridge, is covered with concrete.
[0002]
[Prior art]
As a conventional support structure of a formwork, for example, a support for supporting a formwork for covering a steel member as a main girder of a bridge with concrete, which is supported by the ground or the like is disclosed (for example, Non-Patent Document 1).
The support structure for this formwork has become the main girder of the bridge currently in use as the construction work has become more complex and sophisticated in recent years and the need to consider the impact on the surrounding environment has increased. It is also used when covering with concrete.
[0003]
[Non-Patent Document 1]
Civil Engineering Handbook I, 4th edition, Gihodo Publishing, November 20, 1993, p. 1246
[0004]
[Problems to be solved by the invention]
However, in the conventional support structure of the formwork, the main girder to be covered with concrete is subject to traffic vibration etc., whereas the formwork for covering the steel member receiving the vibration with concrete is Because it is supported by a fixed point such as the ground, the difference in vibration between the steel member and the formwork becomes large, and a composite structure in which the steel member and concrete that receive vibration are integrated cannot be obtained reliably and sufficiently. There is a problem.
That is, in the conventional support structure of the formwork, the formwork hardly vibrates and only the steel member vibrates, and even if concrete is driven into the formwork under such a situation, the steel member As a result, voids are generated in the vicinity of the steel sheet, and the necessary adhesion strength cannot be ensured between the steel member subjected to vibration and the concrete.
[0005]
Therefore, an object of the present invention is to provide a mold frame support structure capable of reducing a vibration difference between a steel girder and a formwork so that a composite structure in which a steel girder subjected to vibration and concrete are integrated is obtained reliably and sufficiently. It is to provide a concrete construction method.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a support structure for a formwork according to the present invention includes a formwork for supporting a formwork for covering a steel girder that is vibrated by running of a vehicle with concrete in a currently used bridge. The support structure is characterized in that the formwork is fixed to a vibrating steel girder by rigid joining and supported only by the steel girder .
[0007]
Further, another formwork support structure according to the present invention is a formwork support structure for supporting a formwork for covering a steel girder that is vibrated by running a vehicle with concrete in a bridge currently in use. The molds are separated at predetermined intervals in the traveling direction of the vehicle, and are composed of each mold piece supported only by the steel girder in the vicinity of the separated position , and the adjacent formwork pieces expand and contract. It is characterized by being connected by a joint.
[0008]
According to the support structure of these formwork, the formwork for covering the steel girder that receives vibration with concrete is fixed to the steel girder that receives vibration by rigid joining, and is supported only from this steel girder . As with the steel girder , the mold is also subjected to vibration, and the vibration difference between the steel girder and the mold can be reduced.
[0009]
Therefore, according to this, when driving a concrete into the mold, will be transmission of vibration to the concrete is ensured from with steel girder with the progress of condensation, resulting, and the steel girder and concrete receiving vibrations It will adhere sufficiently, and a composite structure in which the steel girder subjected to vibration and concrete are integrated can be obtained reliably and sufficiently.
[0010]
On the other hand, in the concrete construction method according to the present invention, a steel girder that vibrates when the vehicle travels in a bridge currently in use is fixed with a rigid steel girder to cover the steel girder that is vibrated with concrete. It is characterized by driving concrete into a formwork that is only supported.
[0011]
According to this concrete construction method, it was fixed by rigid joining to a steel girder subjected to vibration, and the concrete was driven into a formwork supported only from this steel girder , and this was cured, so as the setting progressed The transmission of vibration from the steel girder to the concrete is surely performed. As a result, the steel girder subjected to vibration and the concrete adhere sufficiently, and the composite structure in which the steel girder subjected to vibration and the concrete are integrated. Is reliably and sufficiently obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
In addition, although the case where the steel girder which is a vibrating member in the temporary bridge of the railway 4 is used as a concrete girder in the permanent bridge by being covered with concrete is described here, the application point is a railway structure. The present invention is effective not only when the vibrating member is covered with concrete. For example, the following explanation is valid even when a steel girder, which is a vibrating member in a main bridge of a road, is used as a concrete girder in a main bridge by being covered with concrete.
[0014]
[Support structure of formwork]
FIG. 1 is a cross-sectional view showing an overall configuration of a support structure for a mold according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a schematic configuration of the support structure for the mold.
[0015]
In the present embodiment, as shown in FIG. 1, the formwork support structure includes a steel member 1 composed of a main girder 1a and a sleeper support girder 1b which are vibrating members in a temporary bridge of a railway 4 currently in service. It is used for the purpose of supporting the mold 2 for covering with concrete 3 (see FIG. 3C, the same applies hereinafter).
[0016]
Hereinafter, the main girder 1a, the sleeper receiving girder 1b, the mold 2 and the support structure of the mold will be described in more detail.
[0017]
(1) Main digit 1a
In the temporary bridge, as shown in FIG. 1, vibration energy generated when a railway vehicle (not shown) travels on the rail 41 is mainly transmitted from the rail 41 through the sleeper 42, the sleeper receiving beam 1 b and the beam receiving bracket 51. It is transmitted to the digit 1a.
[0018]
That is, the main beam 1a is configured as a vibrating member.
[0019]
In addition, the reinforcement girder 12, which will be described later, of the main girder 1a is configured to play a role of compensating for the weak point of the concrete 3 which is strong in compressive force but weak in tensile force in the concrete girder. .
[0020]
That is, when the main girder 1a is covered with the concrete 3, the concrete girder in the main bridge which is a composite structure integrated by the adhesive force between the two is constructed.
[0021]
Specifically, as shown in the figure, the main girder 1a is composed of a work girder 11 substantially made of I-shaped steel, and an I-shaped steel in which the width of the lower flange is larger than the width of the upper flange, The reinforcement girder 12 is configured to be bolted to the lower side of the work girder 11.
[0022]
(2) Sleeper girder 1b
In the temporary bridge, as shown in FIG. 1, the vibration energy generated when the railway 4 vehicle travels on the rail 41 is transmitted from the rail 41 through the sleeper 42 to the sleeper beam 1b.
[0023]
That is, the sleeper girder 1b is configured as a vibrating member.
[0024]
In addition, the sleeper girder 1b is configured to play a role of compensating for the weak point of the concrete 3 which is strong in compressive force but weak in tensile force in the concrete slab.
[0025]
That is, when the sleeper girder 1b is covered with the concrete 3, the concrete slab in the main bridge which is a composite structure integrated by the adhesive force between the two is constructed.
[0026]
(3) Form 2
As shown in FIG. 1, the formwork 2 is used for covering the steel member 1 composed of the main girder 1a and the sleeper girder 1b with concrete 3, and is composed of the concrete girder and concrete slab in the main bridge. It is configured to be arranged so that the position, shape and dimensions of the concrete structure can be ensured accurately.
[0027]
That is, according to such a mold 2, the concrete member 3 is driven to cover the steel member 1 composed of the main beam 1 a and the sleeper receiving beam 1 b with the concrete 3. A concrete structure in a permanent bridge with a toll is to be made.
[0028]
Specifically, as shown in the figure, the mold 2 includes a girder mold 21, a slab mold 22, and a gradient mold 23. The girder mold 21 is composed of an upper mold 21a arranged corresponding to the upper part of the main girder 1a and a lower mold 21b arranged corresponding to the lower part of the main girder 1a.
Here, as shown in FIG. 2, the girder form 21 is separated for each part of the main girder 1a that vibrates differently, and each form piece 2a supported only by each part, and each form piece 2a. A support structure for a mold, comprising an expansion joint 24 for connecting the two together.
[0029]
On the other hand, the slab form 22 is configured to be supported by the sleeper girder 1b.
[0030]
(4) Formwork support structure In the present embodiment, the formwork support structure serves to support the formwork 2 for covering the steel member 1 composed of the main beam 1a and the sleeper support beam 1b with the concrete 3. It is configured to fulfill.
[0031]
In this formwork support structure, the formwork 2 is configured to be supported in a fixed state only by the steel member 1. In other words, in this formwork support structure, the formwork 2 is configured not to be supported in a fixed state by members other than the steel member 1.
[0032]
That is, on the other hand, the girder form 21 is supported only by the main girder 1a.
[0033]
On the other hand, the slab form 22 is supported only by the sleeper girder 1b.
[0034]
Here, each formwork piece 2a of the formwork 21 for girders is supported in a fixed state only by each part of the main girder 1a that vibrates differently. In other words, in this mold frame support structure, each mold piece 2a is not supported in a fixed state by a portion other than each portion of the main beam 1a that vibrates differently.
[0035]
That is, the mold 2 is restricted in movement and rotation with respect to the steel member 1, and thereby vibration energy transmitted to the steel member 1 during traveling of the railway 4 vehicle is also transmitted to the mold 2. It is supposed to be.
[0036]
Specifically, the support structure of this formwork is to support the construction girder support means for supporting the upper formwork 21a only by the construction girder 11 and the slab formwork 22 only by the sleeper support girder 1b. The slab support means and the reinforcement girder support means for supporting the lower mold 21b only by the reinforcement girder 12 are provided.
[0037]
The work girder support means is provided on the upper flange of the work girder 11 and is extended to the work girder 11 side from the upper mould 21a and the work girder support arm 61 for supporting the upper mould 21a. 11 is supported by a work girder for supporting a work girder 11, a support arm 62 for a reinforcing girder projecting from the work girder 11 toward the upper mold frame 21a and supporting the upper mold frame 21a, and an upper mold frame The arm 21 includes a support arm 72 for a reinforcing girder that is projected from 21 a toward the construction girder 11 and is supported by the construction girder 11.
[0038]
The slab support means is provided on the lower flange of the sleeper support 1b. The slab support arm 81 for supporting the slab form 22 and the slab support 22 on the sleeper support 1b side. It consists of a slab supported arm 91 that is overhanged and supported by the sleeper girder 1b.
[0039]
Further, the reinforcing girder support means projects from the reinforcing girder 12 to the lower mold frame 21b side, supports a reinforcing girder support arm 62 for supporting the lower mould 21b, and extends from the lower mold frame 21b to the reinforcing girder 12 side. It consists of a reinforcing girder supported arm 72 that is extended and supported by the reinforcing girder 12.
[0040]
That is, according to the support means for reinforcing girders, the upper mold frame 21a and the lower mold frame 21b can be placed on the reinforcing girders 12, thereby reinforcing the upper mold frame 21a and the lower mold frame 21b. The construction difficulty to be supported only by the girder 12 is substantially eliminated, and as a result, a quick and inexpensive construction is secured.
[0041]
As described above, according to such a support structure of the formwork, the formwork 2 for covering the steel member 1 subject to vibration with the concrete 3 is supported only from the steel member 1 subject to the vibration. The mold 2 is also subjected to vibration in the same manner as the steel member 1, and as a result, the difference in vibration between the steel member 1 and the mold 2 can be considerably reduced.
[0042]
Therefore, according to this, when the concrete 3 is driven into the mold 2, the vibration is surely transmitted from the steel member 1 to the concrete 3 as the setting progresses, and as a result, the steel member 1 and the concrete are transmitted. 3 is sufficiently adhered, and a composite structure in which the steel member 1 and the concrete 3 subjected to vibration are integrated is reliably and sufficiently obtained.
[0043]
[Concrete construction method]
FIG. 3 is a construction procedure diagram for explaining a concrete construction method according to an embodiment of the present invention.
[0044]
In the present embodiment, the concrete construction method is performed using the above-described support structure of the formwork, and the main girder 1a in the temporary bridge of the railway 4 currently used is covered with the concrete 3. It is configured as.
[0045]
And this concrete construction method includes each of the reinforcing girder joining step shown in FIG. 3 (a), the mold 2 assembling step shown in FIG. 3 (b), and the concrete placing step shown in FIG. 3 (c). It is comprised by the process. Hereinafter, each step will be described with reference to FIG.
[0046]
(1) Reinforcement girder joining process This is a process of attaching the reinforcement girder 12 to the lower side of the construction girder 11 by bolt joining.
[0047]
(2) Formwork assembling step This is a step of assembling the formwork 2 for covering the vibrating steel member 1 with the concrete 3.
[0048]
Specifically, the construction beam supported arm 71 is mounted on the upper flange of the construction girder 11 by hooking the hook of the reinforcement girder supported arm 72 on a bolt fixed to the reinforcement girder support arm 62 in advance. As a result, the girder form 21 is placed on the main girder 1a, whereby the girder form 21 is positioned with respect to the main girder 1a.
[0049]
Subsequently, the work girder supported arm 71 is rigidly joined to the work girder support arm 61 with a bolt, whereby the positioned girder form 21 is supported in a fixed state by the main girder 1a.
[0050]
At this time, in a state where the girder form 21 is positioned with respect to the main girder 1a, it is possible to fix the girder form 21 to the main girder 1a by rigid joining, thereby The difficulty of construction for supporting the formwork 21 only on the vibrating main girder 1a is substantially eliminated.
[0051]
On the other hand, by rigidly joining the slab supported arm 91 to the slab support arm 81 with a bolt, the slab form 22 is suspended by the sleeper support 1b and supported in a fixed state.
[0052]
(3) Concrete placing step This is a step of placing concrete 3 into the mold 2 supported only by the vibrating steel member 1.
[0053]
Specifically, the concrete 3 is driven into the corners of the mold 2 while being filled, so that material separation of the concrete 3 is prevented, whereby the concrete 3 having high durability and water tightness can be obtained.
In the present embodiment, since there is a constructional constraint condition that careful compaction work is difficult, as the concrete 3, high-fluidity concrete that hardly requires compaction or self-filled concrete that does not require compaction at all is used. Used.
[0054]
Here, the concrete placing step is configured to include a step of hardening the placed concrete 3.
[0055]
Specifically, the concrete 3 that has been laid is surely transmitted with vibrations from the steel member 1 to the concrete 3 as the setting progresses. Adhere to.
[0056]
By such a concrete construction method, a composite structure in which the steel member 1 subjected to vibration and the concrete 3 are integrated is obtained.
[0057]
【The invention's effect】
According to the present invention, the steel girder subjected to vibration and the concrete sufficiently adhere to each other, and a composite structure in which the steel girder subjected to vibration and the concrete are integrated is surely and sufficiently obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the overall structure of a mold frame support structure according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a schematic configuration of a support structure for a mold according to an embodiment of the present invention.
FIG. 3 is a construction procedure diagram illustrating a concrete construction method according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel member 1a Main girder 1b Sleeper girder 2 Formwork 2a Formwork piece 3 Concrete 4 Railway 11 Construction girder 12 Reinforcement girder 21 Girder form 21a Upper form 21b Lower form 22 Slab form 23 Gradient form 24 Expansion joint 41 Rail 42 Sleeper 51 Girder support bracket 61 Construction girder support arm 62 Reinforcement girder support arm 71 Construction girder supported arm 72 Reinforced girder supported arm 81 Slab support arm 91 Slab supported arm

Claims (3)

A formwork support structure for supporting a formwork for covering a steel girder that is vibrated by running of a vehicle with concrete in a bridge currently being used,
The formwork support structure, wherein the formwork is fixed to the steel beam by rigid joining and is supported only by the steel beam . A formwork support structure for supporting a formwork for covering a steel girder that is vibrated by running of a vehicle with concrete in a bridge currently being used,
The mold is separated at predetermined intervals in the traveling direction of the vehicle, and includes each mold piece supported only by the steel girders in the vicinity of the separated position.
A support structure for a formwork, wherein the adjacent formwork pieces are connected by an expansion joint. The steel girder which vibrate by the vehicle travels is fixed by rigidly joined to the steel girder for coating concrete in bridges which are currently in service, characterized by implanting concrete mold frame was supported only by the steel girder The concrete construction method.

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