JP3814286B2 - Formwork support structure - Google Patents

Description

  The present invention relates to a formwork support structure and a concrete construction method used when a member subjected to vibration, such as a bridge girder in a currently used bridge, is covered with concrete.

  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.
Civil Engineering Handbook I, 4th edition, Gihodo Publishing, November 20, 1993, p. 1246

  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.

  Accordingly, the present inventors have developed a formwork support structure in which a formwork for covering a steel member subject to vibration with concrete is supported only from the steel member subject to the vibration. That is, according to such a support structure of the formwork, the difference in vibration between the steel member and the formwork is reduced, and as a result, a composite structure in which the steel member subjected to vibration and the concrete are integrated is obtained reliably and sufficiently. It is possible to be

  By the way, as described above, this formwork support structure is suitable for use in construction in which steel members to be covered with concrete are continuously subjected to traffic vibration.

  Here, as such a construction, for example, a construction intended to be used as a concrete girder in a main bridge by covering a steel girder, which is a vibrating steel member in a temporary bridge of a railway, with concrete, or a permanent bridge on a road There is a construction to use as a concrete girder in a permanent bridge by covering a steel girder, which is a vibrating steel member, with concrete.

However, in these constructions, it is usually necessary to construct without interrupting the traffic currently in service, such as trains and automobiles, and rapid construction is required.
Therefore, it is desired that the conventional support structure for the formwork sufficiently satisfy the requirement for rapid construction.

  Then, the subject of this invention is providing the support structure of the formwork which can aim at the simplification and speeding-up of field work so that the request | requirement of rapid construction may fully be satisfy | filled.

In order to solve the above-mentioned problem, the formwork support structure according to the first invention is such that a formwork for covering a member that vibrates when a vehicle travels in a currently used bridge with concrete is supported only by the member. And the vibrating member is a girder member having an I-shaped cross section or an H-shaped cross section, and the side end portion of the lower flange of the member projects outward from the side end portion of the upper flange. The lower end of the mold frame arranged on the side is joined to the protruding portion of the lower flange , the mold frame is an embedded mold frame, and a predetermined interval in the traveling direction of the vehicle Is a mold formed of each mold frame piece that is only supported by the member at the separated position, and for a portion that does not bear a compressive force among joints formed between the mold frame pieces. Is a joint material that does not transmit stress Are filled, joint compound for transmitting the compressive force to the portion to be borne a compressive force is characterized by being filled.

  According to the support structure for a formwork according to the first invention, when the vibrating member is a girder member having an I-shaped cross section or an H-shaped cross section, the lower end portion of the formwork disposed on the side portion is the lower flange. Since it is joined to the overhanging part, the lower flange of the beam, which is a vibrating member, can function as a bottom mold until the concrete hardens. Simplification and speed-up will be achieved, and the demand for rapid construction will be sufficiently satisfied.

Moreover, when it consists of each formwork piece supported only by the said member in the cut | disconnected position, a site worker should bear the joint which does not bear compression force among joints of each formwork piece, and compression force It is only necessary to fill joint materials that match the joints, and until the concrete hardens, special work to prevent stress from being transferred between the mold pieces, and after the concrete is hardened, the embedded formwork As a part of the structure, no special work is required to transmit the compressive force, and the work volume can be reduced and the on-site work can be simplified and speeded up. It will be.

  According to the support structure for a formwork according to the present invention, the on-site work can be simplified and speeded up, and the requirement for rapid construction is sufficiently satisfied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Here, a case where a steel girder, which is a vibrating member in a temporary bridge of a railway, is used as a concrete girder in a main bridge by being covered with concrete, but is not limited thereto. The following explanation is valid even when the steel girder, which is a vibrating member in the road's main bridge, is used as a concrete girder in the main bridge by being covered with concrete.

  FIG. 1 is a cross-sectional view showing the overall structure of a formwork support structure according to an embodiment of the present invention, FIG. 3 is a perspective view showing a partial structure of the formwork support structure, and FIG. It is a perspective view which shows schematic structure.

  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).

  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.

(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.

  That is, the main beam 1a is configured as a vibrating member.

  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. .

  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.

  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.

(2) Sleeper girder 1b
In the temporary bridge, as shown in FIG. 1, vibration energy generated when the railway vehicle travels on the rail 41 is transmitted from the rail 41 through the sleeper 42 to the sleeper support beam 1 b.

  That is, the sleeper girder 1b is configured as a vibrating member.

  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.

  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.

(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.

  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.

  Here, the mold 2 is configured as an embedded mold 2 that is a plate material made of concrete or mortar.

  That is, according to such a mold 2, after the concrete is hardened, the embedded mold 2 can be handled as a part of a composite structure in which the main girder 1a and the concrete are integrated. The work of disassembling the frame 2 is not required, and the work amount can be simplified and speeded up by reducing the work amount.

  Specifically, the mold 2 is composed of a girder mold 21, a slab mold 22, and a gradient mold 3, as shown in FIG. 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. 3, the girder form 21 is separated for each part of the main girder 1a that vibrates differently, and each form piece 2a supported by each part, and each form piece It consists of joint material 24 filled with respect to the joint formed between.

  The joint material 24 includes a stress non-transmission joint material 24a filled in a joint that does not bear compressive force, and a stress transmission joint material 24b filled in a joint that should bear compressive force. ing.

  The stress non-transmitting joint material 24a is used for the purpose of absorbing displacement caused by different vibrations until the concrete is hardened, and is made of, for example, rubber. On the other hand, the stress transmission joint material 24b is used for the purpose of transmitting a compressive force after the concrete is hardened, and is configured of, for example, an epoxy resin.

  That is, according to such a girder form 21, since it has the stress non-transmitting joint material 24a, even when the main girder 1a vibrates differently depending on the location until the concrete is hardened. Thus, displacement due to vibration is ensured freely, so that stress is not transmitted between the mold frame pieces 2a. On the other hand, since the stress transmission joint material 24b is provided, the compressive force is transmitted between the mold frame pieces 2a after the concrete is hardened, and the embedded mold frame 2 is connected to the main girder 1a and the concrete. The function as a part of the integrated composite structure can be exhibited.

  On the other hand, the slab form 22 is configured to be supported by a sleeper girder 1b as shown in FIG.

(4) Formwork Support Structure In the present embodiment, the formwork support structure is a mold for covering the steel member 1 composed of the main beam 1a and the sleeper support beam 1b with concrete 3 as shown in FIG. It is configured to play a role of supporting the frame 2.

  In this formwork supporting structure, the formwork 2 is configured to be supported only by the steel member 1.

  That is, on the other hand, the upper mold 21a of the girder mold 21 is supported in a fixed state only by the construction girder 11 as shown in FIG. Further, as shown in the figure, the lower mold 21b is supported in a substantially fixed state only by the reinforcing beam 12.

  On the other hand, the slab form 22 is supported in a fixed state only by the sleeper girder 1b as shown in FIG.

  That is, the mold 2 is restricted in movement and rotation with respect to the steel member 1, whereby vibration energy transmitted to the steel member 1 during traveling of the railway vehicle is also transmitted to the mold 2. It has become.

  Specifically, the support structure for this formwork is a construction girder support means for supporting the upper mold form 21a only by the work girder 11 and a support structure for supporting the slab form 22 only by the sleeper 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.

  As shown in the figure, the work girder support means is provided on the upper flange of the work girder 11, and supports the work girder support arm 61 for supporting the upper mold 21a, and the upper girder 21a from the work girder 11 side. Supported by the work girder 11 and supported by the work girder 11 and a support for the reinforcing girder projecting from the work girder 11 toward the upper mold frame 21a and supporting the upper mould 21a The arm 62 includes a support arm 72 for a reinforcing beam that protrudes from the upper mold 21 a toward the construction beam 11 and is supported by the work beam 11.

  Further, the slab support means is provided on the lower flange of the sleeper support 1b, and a slab support arm 81 for supporting the slab form 22 and a slab support 22 extending from the slab form 22 toward the sleeper support 1b. And a slab supported arm 91 for being supported by the sleeper support 1b.

  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.

  Here, as shown in FIGS. 1 and 2, on the one hand, the reinforcing girder support arm 62 has a rod-like convex part 62a protruding in the length direction of the main girder 1a, and on the other hand, the reinforcing girder The supported arm 72 has a U-shaped recess 72a that opens downward.

  The support structure of the lower mold 21b is supported by fitting the U-shaped concave portion 72a of the reinforcing girder supported arm 72 to the rod-shaped convex portion 62a of the supporting arm, as shown in these drawings. It is.

  In other words, according to such a support structure for the lower mold 21b, the field worker simply fits the U-shaped recess 72a of the supported arm into the rod-shaped protrusion 62a of the support arm, and attaches the lower mold 21b to the reinforcing girder. 12 can only be supported.

  Therefore, according to such a formwork support structure, it is possible to simplify and speed up on-site work, thereby sufficiently satisfying the requirement for rapid construction. ing.

  Even if the U-shaped recess 72a of the single support arm 72 for the reinforcing girder fits into the rod-shaped protrusion 62a of the single support arm 62 for the reinforcing girder, the supported arm 72 for the reinforcing girder is used for the reinforcing girder. The U-shaped concave portion 72a and the bar-shaped convex portion 62a are arranged as a set in the vertical direction, but are not locked to the support arm 62. The reinforced girder supported arm 72 is locked to the reinforcing girder support arm 62 simply by fitting the letter-shaped concave part 72 a into the rod-shaped convex part 62 a of the pair of reinforcing girder support arms 62.

  By the way, as shown in FIG. 2, the U-shaped concave portion 72a of the reinforcing girder supported arm 72 in the support structure of the lower mold 21b is opened obliquely outward and downward.

  In other words, in the support structure of the lower mold 21b, as shown in the figure, the U-shaped recess 72a of the reinforcing girder supported arm 72 is opened to the lower side, and the lower mold 21b is used as the reinforcing girder 12b. The U-shaped concave portion 72a having such a shape is configured such that the movement in the upward direction is free and the movement and rotation in the horizontal direction and the downward direction are restricted. Since the weight of the concrete is effectively applied to the lower mold 21b until the concrete hardens, the movement and rotation of the lower mold 21b with respect to the reinforcing girder 12 are substantially restricted, and as a result, The vibration difference between the reinforcing beam 12 and the lower mold 21b can be further reduced.

  Here, as shown in FIG. 1, the support structure of the lower mold 21b is such that the side end of the lower flange of the main girder 1a projects outward from the side end of the upper flange. The lower end of 21 is joined to the upper surface of the overhanging lower flange.

  That is, according to such a support structure of the lower mold 21b, the lower flange of the main girder 1a can function as the mold 2 to be arranged at the bottom until the concrete is hardened. It has become.

  Therefore, according to such a support structure of the formwork, it is possible to simplify and speed up the field work through the reduction of the amount of the formwork 2, thereby satisfying the demand for rapid construction. It is possible to fully satisfy.

  Further, as shown in FIG. 3, the support structure of the mold is composed of each mold piece 2a in which the girder mold 21 is supported in a substantially fixed state only by each part of the main girder 1a that vibrates differently. It is structured as a thing.

  And as shown in the same figure, the stress non-transmitting joint material 24a for absorbing the displacement caused by the different vibrations is applied to the joint formed between the mold pieces without bearing the compressive force. Filled portions are filled with a stress transmission joint material 24b for transmitting the compressive force to the portion that should bear the compressive force.

  That is, according to such a formwork support structure, the formwork 2 is the embedded formwork 2 and is separated for each part of the member that vibrates differently, and is supported only by the respective parts. In the case of the formwork piece 2a, the field worker simply fills joints 24 that do not bear compressive force and joints that should bear the compressive force among joints between the formwork pieces. Well, until the concrete hardens, special work to absorb the displacement generated between the mold pieces due to different vibrations, or after the concrete hardens, the embedded formwork 2 is used as a part of the structure. No special work is required to transmit the compressive force.

  Therefore, according to such a support structure of the formwork, it is possible to simplify and speed up on-site work through reducing the amount of work, thereby sufficiently satisfying the demand for rapid construction. It is possible to satisfy.

It is sectional drawing which shows the whole structure of the support structure of the formwork which concerns on one embodiment of this invention. It is a perspective view which shows the partial structure of the support structure of the formwork which concerns on one embodiment of this invention. It is a perspective view which shows schematic structure of the support structure of the formwork which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel member 1a Main girder 1b Sleeper girder 2 Formwork 2a Each 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 Joint material 24a Stress-non-transmitting joint material 24b Stress-transmitting joint material 41 Rail 42 Sleeper 51 Girder support bracket 61 Supporting girder support arm 62 Reinforcement girder support arm 62a Rod-shaped convex portion 71 Construction girder supported arm 72 Reinforcing girder Supported arm 72a U-shaped recess 81 Support arm for slab 91 Supported arm for slab

Claims (1)

A formwork support structure in which a formwork for covering a member that vibrates by running a vehicle with concrete in a bridge currently in service is supported only by the member,
The vibrating member is a girder member having an I-shaped cross section or an H-shaped cross section,
The side end of the lower flange of the member projects outward from the side end of the upper flange,
The lower end of the formwork arranged on the side is joined to the protruding portion of the lower flange ,
The mold is an embedded mold, and is a mold formed of each mold piece that is separated at a predetermined interval in the traveling direction of the vehicle and supported only by the member at the separated position;
Of the joints formed between the mold pieces, joints that do not transmit stress are filled in the joints that do not bear compressive force, and compressive forces are applied to the parts that should bear the compressive force. A support structure for a formwork, which is filled with a joint material for transmitting heat .

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