JP2005163350A - Rail bearer in bridge work execution - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rail bearer very easily attached and detached without damaging coating of a bridge girder. <P>SOLUTION: This rail bearer 10 is constituted by supporting a support base part 12 provided with a fixing mechanism 20, by a leg part 11, and fixed onto the bridge girder 1 by the engagement of the fixing mechanism 20 with a large diameter head 31 of a stud dowel 30 erected on an upper flange 1A of the bridge girder 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rail cradle that supports a rail for moving and guiding a formwork on which a floor slab is formed of cast-in-place concrete during bridge construction on a bridge girder.

Recently, as a method of constructing bridges for small main girder PC floor slabs, the formwork of the floor slab is moved along the rails provided on the bridge girder (steel main girder), and concrete is cast in order to make PC floor slabs. The construction method to build is known. (See Patent Document 1)
In such a construction method, as shown in FIG. 5 (A), for example, a rail 52 on which a floor slab form carriage 51 travels is supported by a rail pedestal 60 fixed to a bridge girder 53. Is laid on the top surface.

  The support beam 54 is formed, for example, by connecting H-shaped steels so as to continue along the rail arrangement area, and is intermittently arranged at predetermined intervals on the bridge girder 53 (on the upper flange 53A of the steel main girder). It is supported by the rail cradle 60.

  As shown in FIG. 5B, which is an enlarged view of a portion B of FIG. 5A, and FIG. 5C, which is a cross-sectional view taken along the line CC of FIG. The lower surface plate 61 and the upper surface plate 62 that support the support beam 54 are joined and integrated by vertical members 63 (vertical ribs 63A, horizontal ribs 63B) to be formed at a predetermined height, and are connected to the bridge girder 53 on both sides. A fastening mechanism 64 is provided.

  The fastening mechanism 64 has an L-shape and a fastening bracket 64A having a fastening screw 64B penetratingly attached to the tip of the short side thereof, in the vicinity of the joint portion of the lateral rib 63B with the lower surface plate 61 at the base end portion of the long side. Between the fixed position where the fastening screw 64B is below the lower surface plate 61 and the retracted position outside the lower surface plate 61 as indicated by the phantom line in FIG. 5C. The lower plate 62 and the upper flange 53A can be swung by tightening the fastening screw 64B with the upper fitting 53A of the bridge girder 53 sandwiched between the lower plate 61 and the fastening screw 64B with the fastening bracket 64A as a fixed position. And come to conclude.

  The rail cradle 60 configured as described above is placed on the upper flange 53A of the bridge girder 53, and fixed to the upper flange 53A of the bridge girder 53 by the right and left fastening mechanisms 64 on both sides thereof.

Further, the rail cradle 60 and the support beam 54 are fastened and fixed by a vise 55 called a so-called bullman in which the upper surface plate 62 of the rail cradle 60 and the lower flange of the support beam 54 are arranged on both the left and right sides. The
JP 2000-248512 A

  By the way, during the construction work of the bridge as described above, as shown by an imaginary line in FIG. 5C, a support member 56 such as a pipe protrudes laterally on the bridge girder 53, and is attached to the support member 56. A work scaffold 57 is constructed adjacent to the side of the bridge girder 53 while being supported.

  Here, the rail cradle 60 needs to be detached when the rail 52 is lifted when assembling a reinforcing bar or PC steel wire or when placing concrete. However, in the above-described conventional rail cradle 60, the above-mentioned work scaffolding is required. 57 interferes with the swinging region of the fastening bracket 64A of the fastening mechanism 64, which requires work such as removing the work scaffold 57 each time it is attached / detached, which is troublesome and extremely troublesome.

  In addition, there is a problem that the bridge girder 53 is damaged by the fastening screws 64B of the fastening mechanism 64 and repair is required.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rail cradle that can be attached and detached very easily and that does not damage the coating of the bridge girder.

  The rail cradle for the bridge construction of the invention according to claim 1 that achieves the above object is the rail cradle for supporting the rail for moving and guiding the formwork in which the floor slab is formed of the cast-in-place concrete on the bridge girder. A stud gibber which is a base and has a leg portion mounted on the upper flange of the bridge girder and a support top plate for supporting the rail, and is formed at a predetermined height, and is erected on the upper flange of the bridge girder And a fixing mechanism that is engaged and fixed.

  The rail cradle of this configuration is placed on the upper flange of the bridge girder at the leg, and the fixing mechanism is fixed by engaging with the stud gibber erected on the upper flange of the bridge girder, and the rail is supported by the support top plate. To do.

  According to a second aspect of the present invention, the fixing mechanism according to the first aspect further includes an engagement fitting that is formed with a threaded portion at least at the tip and that engages with the large-diameter head of the stud gibel at the other end. The support shaft member passes through the support top plate from the lower side to the upper side with the tip facing upward, and is supported by the nut member engaged with the screw portion on the upper side of the support top plate so as to be suspended. The engagement metal fitting is configured to move up and down by screwing.

  In this configuration, the fixing mechanism is such that the engaging bracket engages with the large-diameter head of the stud gibber, and the supporting top plate, that is, the rail cradle is attached to the upper flange of the bridge girder by pulling up the engaging bracket by screwing of the nut member. Press to fix.

  According to a third aspect of the present invention, the engagement fitting according to the second aspect includes an engagement plate portion that is substantially orthogonal to the support shaft member, and the shaft portion of the stud dowel is loosely fitted to the engagement plate portion. It is characterized in that the joint notch is formed so as to open to one side.

  In this configuration, the engagement fitting engages with the head portion of the stud dibel in the pulling-up direction by causing the shaft portion of the stud dowel to be inserted into the engagement notch portion of the engagement plate portion via the opening portion.

  Furthermore, in the invention according to claim 4, the engagement metal fitting according to claim 3 is formed by extending the engagement plate portion at a substantially right angle at a lower edge of the attachment plate portion, and the support shaft is formed by the attachment plate portion. The engaging notch is fixed to the member, and the engagement notch is open to the side of the engagement plate, and the engagement plate has a shape corresponding to the outer shape of the head through which the head of the stud gibber can pass. The passage hole is formed continuously with the engagement notch.

  In this configuration, the engagement metal fitting passes the head portion of the stud dowel from the mounting plate portion side through the passage hole, and the shaft portion of the stud dowel is inserted into the engagement notch portion of the engagement plate portion. As a result, the engaging plate portion, that is, the engaging bracket engages with the stud gibber head in the pulling direction, and when the vertical position of the passage hole with respect to the head changes, the head cannot pass through the passage hole and cannot be detached. Become.

  According to the rail cradle at the time of the bridge construction of the invention according to claim 1, the leg is placed on the upper flange of the bridge girder, and the fixing mechanism is engaged with the stud gibber erected on the upper flange of the bridge girder. Fixed. Since the fixing mechanism is engaged with the stud gibber, it does not interfere with the work scaffold constructed adjacent to the side of the bridge girder. Therefore, the work scaffold is removed when the track cradle is attached or detached. This work is unnecessary, can be easily attached and detached, and does not damage the bridge girder.

  According to the invention of claim 2, the fixing mechanism is such that the engaging bracket engages with the large-diameter head of the stud gibber, and the rail mount is lifted by pulling up the engaging bracket by screwing of the nut member. Since it is pressed and fixed to the upper flange of the bridge girder, it is easy to attach and detach, and does not damage the paint on the bridge girder.

  According to the invention of claim 3, the engagement fitting is configured such that the stud gibber shaft portion is fitted and inserted into the engagement notch portion of the engagement plate portion via the opening portion. Since it is engaged in the pulling direction, engagement and disengagement can be performed very easily, and attachment / detachment work is facilitated.

  According to the invention of claim 4, the engaging metal fitting passes the head portion of the stud dowel from the mounting plate portion side through the passage hole, and the shaft portion becomes the engaging notch portion of the engaging plate portion. By engaging with the head position of the stud dowel in the pulling-up position, and the vertical position of the passage hole with respect to the head is shifted, the head cannot pass through the passage hole and cannot be detached. On the other hand, the engagement and disengagement can be easily performed, but the safety is extremely high without inadvertent separation.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional perspective view of a rail facility to which one configuration example of a rail pedestal at the time of bridge construction according to the present invention is applied, and shows a use state of the rail cradle.

  In the illustrated rail installation, a plurality of rail holders 10 are fixed on the upper flange 1A of the bridge girder 1 which is an I-shaped steel girder at a predetermined interval in the extending direction of the bridge girder 1 (bridge axis direction). 10, the rail 3 as a rail is supported via the support beam 2 made of H-shaped steel continuous in the bridge axis direction.

  On the upper flange 1 </ b> A of the bridge girder 1, a large number of stud gibels 30 are erected in a predetermined arrangement for combining the bridge girder 1 and the concrete of the floor slab with strength synthesis. The stud dowel 30 includes a large-diameter head 31 at the tip of a shaft portion 32.

  As shown in the front view in FIG. 2A, the plan view in FIG. 2B, and the side view in FIG. 2C, the rail cradle 10 supports the support base portion 12 including the fixing mechanism 20 by the leg portions 11. The fixing mechanism 20 is configured to engage with a stud gibber 30 erected on the bridge girder 1 so as to be fixed on the bridge girder 1.

  The leg portion 11 is composed of a pair of channel steels 11A having a predetermined length, and is fastened and fixed with bolts and nuts to the left and right ends of the lower surface of the support base 12 on the upper side with the open side facing each other in a sideways state. .

  The support base portion 12 is used with the H-shaped steel laid sideways, and the leg portions 11 are fastened to the left and right ends of the flange (lower surface plate 12L) on the lower side. The front shape is an inverted trapezoid in which the side edge of the upper flange (upper surface plate 12U as a support top plate portion) protrudes to the side by a predetermined amount from the side edge of the lower surface plate 12L. Fixing mechanisms 20 are respectively provided at portions protruding laterally from the bottom plate 12L. The arrangement position of the fixing mechanism 20 is set so as to correspond to the stud gibel 30 erected on the upper flange 1A of the bridge girder 1, and the side edge of the lower surface plate 12L of the support base 12 is the upper edge of the upper surface plate 12U. The reason for retracting from the side edge is to avoid interference of the fixing mechanism 20 with an engagement fitting 22 described later. A fastening hole 12a for fastening the support beam 2 is formed in the upper surface plate 12U. The fastening hole 12a is a long hole in the bridge axis direction, and can be easily fastened according to the fastening position with the support beam 2.

  The fixing mechanism 20 is configured to include an engagement fitting 22 at the lower end of a support rod 21 having a predetermined length with a screw formed at the upper end, and the upper end of the support rod 21 is formed on the upper surface plate 12U of the support base 12. The through hole is passed through from the lower side to the upper side, and is fixed to the upper surface plate 12U of the support base 12 by a nut 23 as a nut member screwed to the tip thereof.

  As shown in FIG. 3A, a front view is shown in FIG. 3A, a plan view is shown in FIG. 3B, and a side view is shown in FIG. It has an L-shaped cross section extending at a right angle, and is welded and fixed to the lower end of the support rod 21 at the tip of the mounting plate 22A. As shown in FIG. 3 (B), the engagement plate portion 22B is formed with a slit 22C as an engagement notch portion having a width that allows the shaft portion 32 of the stud gibber 30 to be loosely fitted from the center toward the mounting plate portion 22A. As shown in FIG. 3A, the mounting plate portion 22A is formed with a passage hole 22D having a similar shape that is slightly larger than the outer shape of the head 31 of the stud gibber 30 and is continuous with the slit 22C. That is, the slit 22C is open to the mounting plate 22A side through the passage hole 22D. As a result, the stud 31 is made parallel to the mounting plate portion 22A, and the head portion 31 is caused to pass through the back surface side of the mounting plate portion 22A corresponding to the passage hole 22D as indicated by an imaginary line in FIG. Thus, as shown by an imaginary line in FIG. 3 (A), the shaft portion 32 of the stud dowel 30 can move into the slit 22C and the head portion 31 can be in an engaged state positioned above the engagement plate portion 22B. It is something like that.

  In the fixing mechanism 20 having the above-described configuration, when the nut 23 that is screwed to the tip of the support rod 21 (the support rod 21 is locked to the upper surface plate 12U of the support base 12) is screwed, the support rod 21 moves upward. To be raised. For this reason, the engaging bracket 22 is engaged with the stud gibber 30 and the nut 23 is screwed, so that the pulling force of the stud gibble 30 is reversed and the support base 12 (that is, the rail base 10) is It presses on the upper flange 1A and acts to fix it on the upper flange 1A (bridge girder 1).

  Thus, the rail cradle 10 configured as described above is placed at a predetermined position on the bridge girder 1 by the leg portion 11, and the engagement fittings 22 of the left and right fixing mechanisms 20 are respectively engaged with the stud gibber 30. Then, the nut 23 is screwed and pressed onto the bridge girder 1 to be fixed. Engagement of the engagement bracket 22 of the fixing mechanism 20 to the stud gibber 30 can be easily performed in the manner of hooking, and the head 31 of the stud gibble 30 is vertically moved with respect to the passage hole 22D of the engagement bracket 22. It becomes impossible to drop off by shifting. As a result, the mounting on the bridge girder 1 can be performed very easily, and the fixing mechanism 20 does not interfere with the scaffold disposed adjacent to the bridge girder 1, so that the attaching and detaching work is facilitated. The coating of the bridge girder 1 is not damaged because it is fixed through the door.

  The support rod 21 of the fixing mechanism 20 is allowed to swing by a gap (margin) with the through hole of the upper surface plate 12U of the support base portion 12 through which the support rod 21 passes, and the posture of the engagement fitting 22 is illustrated in FIG. As shown in Fig. 1, any one of the posture in which the engaging plate portion 22B protrudes to the side, the posture in the front-rear direction (bridge axis direction) as shown in Fig. 2B, or an intermediate posture between them is adopted. Therefore, high accuracy is not required for the relative positions of the rail holder 10 and the stud gibber 30.

  Fixing by the fixing mechanism 20 is performed by pressing the rail cradle 10 onto the bridge girder 1 with a reaction force that pulls up the stud gibel 30, and thus a force in the pulling direction acts on the stud gibel 30, but fixing is required. The force is extremely small with respect to the pull-out resistance (10t or more per one) of the stud gibber 30, and the live load of the movable frame carriage that runs on the rail 3 does not act in the direction of pulling out the stud diver 30. It is extremely safe.

  Note that the present invention is not limited to the above configuration example, and can be changed as appropriate. For example, the engagement structure of the engagement plate portion 22B of the fixing mechanism 20 with the stud gibber 30 may be formed so that the slit 22C is opened not on the mounting plate portion 22A side but on the distal end side or side of the engagement plate portion 22B. Furthermore, as shown in the perspective view of FIG. 4, the raised plate 22E is provided at the front end of the engaging plate 22B where the slit 22C is opened, thereby preventing the stud gibber 30 from falling off from the engaged state. An engagement state similar to that of the configuration can be obtained.

It is a fragmentary sectional perspective view of the rail installation to which one structural example of the rail stand at the time of bridge construction concerning the present invention is applied. A rail cradle is shown, (A) is a front view, (B) is a plan view, and (C) is a side view. The engagement metal fitting is shown, (A) is a front view, (B) is a plan view, and (C) is a side view. It is a perspective view which shows the other structural example of an engagement metal fitting. A prior art example is shown, (A) is a conceptual diagram of a rail installation, (B) is an enlarged view of a portion B of (A), and (C) is a C arrow view of (B).

Explanation of symbols

1 Bridge girder 1A Upper flange 3 Rail (rail)
10 rail cradle 11 leg 12 support base 12U top plate (support top plate)
20 Fixing mechanism 21 Support rod (support shaft member)
22 engagement metal fitting 22A mounting plate part 22B engagement plate part 22C slit (engagement notch part)
22D passage hole 23 nut (nut member)
30 Stud Gyvel 31 Head 32 Shaft

Claims (4)

At the time of bridge construction, it is a rail cradle that supports a rail that moves and guides a formwork formed of cast-in-place concrete on the bridge girder,
A leg portion mounted on the upper flange of the bridge girder and a support top plate portion for supporting the rail are formed at a predetermined height, and engaged with a stud gibber erected on the upper flange of the bridge girder. A rail pedestal during construction of a bridge, characterized by comprising a fixing mechanism for fixing.   In the fixing mechanism, a support shaft member having a threaded portion formed at least at the tip and having an engagement metal fitting at the other end engaged with the large-diameter head of the stud gibber has the tip facing upward. And is supported by the nut member that is screwed into the screw portion above the support top plate, and is supported by the nut member, and the engagement metal fitting is moved up and down by the screwing of the nut member. The rail cradle at the time of bridge construction according to claim 1, wherein   The engagement fitting includes an engagement plate portion that is substantially orthogonal to the support shaft member, and an engagement notch portion in which the shaft portion of the stud gibber is loosely fitted to the engagement plate portion is opened to one side. It is comprised, The rail stand at the time of bridge construction of Claim 2 characterized by the above-mentioned. The engagement metal fitting is formed by extending the engagement plate portion at a substantially right angle at a lower edge of the attachment plate portion, and is fixed to the support shaft member by the attachment plate portion, and the engagement notch portion is While opening to the side of the engaging plate portion, the engaging plate portion has a passage hole having a shape corresponding to the outer shape of the head portion through which the head portion of the stud gibber can pass continuously to the engaging notch portion. It is formed, The rail cradle at the time of bridge construction of Claim 3 characterized by the above-mentioned.

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