JP2005090109A - Erection method of bridge, and upper work unit for bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an erection method of a bridge and an upper work unit for the bridge for erecting the bridge in a place where a sufficient working yard cannot be secured around, like a bridge laid over a road, a track or a river. <P>SOLUTION: The whole length of a steel floor slab girder 1 is constructured by gradually stretching the steel floor slab girder 1 in an erected direction while constructing it. The steel floor slab girder 1 is constructed of a central floor slab part 1A and side floor slab parts 1B, 1B located on both sides, in an orthogonal direction to the erected direction. The side floor slab parts 1B, 1B are connected to both side parts of the central floor slab part 1A so that they can be rotated respectively in the orthogonal direction to the erected direction and bent onto the upper side of the central floor slab part 1A. The steel floor slab girder 1 is stretched in a state of the side floor slab parts 1B, 1B being bent to the upper side of the central floor slab part 1A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bridge construction method and a bridge superstructure unit for constructing a bridge in a place where a sufficient work yard cannot be secured around, such as a bridge over a road, a railroad, or a river. It is.

  For example, when a viaduct is bridged over a road, there is a traffic of pedestrians and vehicles in the underarm space, and a sufficient work space cannot be secured in the underarm space.

  As a construction method of the bridge girder in such a case, a feeding construction method is generally known in which the bridge girder is constructed in a block shape on one side or both sides of the road and is gradually fed onto the road to construct the full length of the bridge girder.

  This construction method has the merits of restricting the traffic of pedestrians and vehicles and not having to limit the construction to midnight with few pedestrians and vehicles.

In addition, as an erection method of a bridge that is erected on a river or the like, an emergency bridge that is constructed so that the upper part of the bridge is folded in a direction orthogonal to the erection direction is known (Patent Document 1).
Japanese Patent Laid-Open No. 7-259015

  However, the delivery method has problems such as the need to secure a fairly large space as a construction yard for the installation and removal of hand-rollers, temporary equipment such as carts, and the placement of cranes for grounding. .

  Also, since the superstructure constructed in blocks is sent out sequentially onto the road to construct the full length of the superstructure, it is necessary to alternately construct and send the superstructure, which only complicates the construction. However, there were problems such as troublesome construction management.

  The emergency bridge described in Patent Document 1 is constructed so that the superstructure can be automatically and safely expanded and folded at the same time as the superstructure is lifted and suspended, and can be applied to the feeding method. is not.

  The bridge erection method according to claim 1 is a bridge erection method in which a bridge superstructure is constructed by constructing a bridge superstructure and gradually sending it out in the erection direction to construct the entire length of the superstructure. It is characterized by being bent in a direction and sent out.

  In the present invention, in particular, it is not possible to secure a sufficient work yard around the bridge by bending the superstructure of the bridge in a direction perpendicular to the installation direction (bending the widthwise end of the superstructure) and sending it out in the installation direction. Even in places, bridges can be erected in a very short period of time without adversely affecting the surrounding environment.

  In this case, as the superstructure, for example, a steel floor slab girder constructed by laying a floor steel plate on a frame consisting of a plurality of main girders made of H-shaped steel or the like and a cross beam is light and constructed. Although it is excellent in performance, a reinforced concrete girder may be used depending on the material used, and a truss girder may be used depending on the structure if it is possible in terms of construction.

  The bridge superstructure unit according to claim 2 is a bridge superstructure unit used for a bridge in which the overall length of the superstructure is constructed by gradually sending out in the erection direction while constructing the bridge superstructure, It is composed of a central floor slab portion and side floor slab portions located on both sides thereof in a direction orthogonal to the bridge erection direction, and the side floor slab portion is perpendicular to the erection direction on the side of the central floor slab portion. It is connected to be able to be bent.

  In the case of the present invention, for example, the side floor slab portion can be bent in a direction orthogonal to the installation direction by connecting the side floor slab portion to both sides of the central floor slab portion in a direction orthogonal to the installation direction. It can be a structure.

  The bridge erection method according to claim 1 is a bridge erection method in which the entire length of the superstructure is constructed by gradually feeding it in the erection direction while constructing the superstructure of the bridge. In particular, the superstructure is orthogonal to the erection direction. By bending it in the direction to be sent out, the space required as a work yard can be reduced as much as possible, and a bridge can be erected in a very short period of time without adversely affecting the surrounding environment. . In addition, the support material such as a vent that temporarily supports the superstructure can be reduced in size and labor can be saved.

  The superstructure unit of a bridge according to claim 2 is a superstructure unit of a bridge used for a bridge in which the full length of the superstructure is constructed by gradually sending out in the construction direction while constructing the superstructure of the bridge, It is composed of a central floor slab portion and side floor slab portions located on both sides thereof in a direction orthogonal to the bridge erection direction, and the side floor slab portion is perpendicular to the erection direction on the side of the central floor slab portion. Since they are connected in a foldable manner and unitized, operations such as unloading, assembling and delivery can be performed very efficiently.

  1 and 2 show an example of the present invention. In FIGS. 1 (a) and 1 (b), reference numeral 1 denotes a steel deck slab constructed as a superstructure of a bridge, and 2 supports a steel deck slab 1. It is a pier constructed as a substructure.

  The steel slab girder 1 is light in weight and excellent in workability, and a floor steel plate 1c is laid on a frame made up of a plurality of main girders 1a and cross beams 1b made of H-shaped steel, etc. It is constructed by projecting the reinforcing rib 1d, and is unitized into a block of a certain length. In addition, asphalt pavement 1e is given on the floor steel plate 1c.

  The steel floor slab girder 1 is constructed from a central floor slab portion 1A and side floor slab portions 1B, 1B located on both sides thereof in a direction orthogonal to the erection direction. The side floor slab portions 1B, 1B are central floor slabs. It is connected to both side portions of the portion 1A so as to be able to be bent to the upper side of the central floor slab portion 1A by rotating in the direction orthogonal to the installation direction.

  Further, the central floor slab part 1A and the side floor slab parts 1B and 1B are separately carried into the site and then temporarily assembled at the site, and when installed, as shown in FIG. After the plate portions 1B and 1B are bent to the upper side of the central floor plate portion 1A and further bridged between the piers 2 and 2, the side floor plate portions 1B and 1B on both sides as shown in FIG. It is structured to be lowered horizontally on both sides of the central floor slab portion 1A.

  In this case, the central floor slab portion 1A is constructed by laying a floor steel plate 1c on two main girders 1a, 1a arranged in parallel, and the side floor slab portions 1B, 1B are one main slab portion. It is constructed by laying a floor steel plate 1c on the girder 1a, and in each case, a plurality of reinforcing ribs 1e are projected from the lower surface of the floor steel plate 1c.

  2 (a) to 2 (c) show a construction method of a steel deck spar, and the construction method will be described with reference to the drawings.

(1) First, the central floor slab part 1A and the side floor slab parts 1B, 1B are separately carried into the site by the trailer 3, respectively.

(2) Next, the steel slab girder 4 constructed in advance construction is used as a work yard, and the central slab part 1A and the side slab parts 1B and 1B are respectively placed on the steel slab girder 4. Unload by crane 5. When unloading, a part of the under-sparing space is occupied as a work yard. However, when the under-sparing space is a road or the like, as shown in FIG. As a result, the occupied portion is made to be about the width of the median strip of the road to minimize the occupied portion.

  Further, the outrigger (not shown) that supports the crane 5 protrudes on the road, but the crane 5 is made to be on the road for a short time as much as possible so as not to prevent the traffic of pedestrians and vehicles.

(3) Next, the central floor slab part 1A and the side floor slab part 1B on the cart 6 previously arranged on the steel floor slab girder 4
, 1B are temporarily assembled to construct one block of the steel deck girder 1. In this case, the side floor slab portions 1B and 1B on both sides are bent on the central floor slab portion 1A as shown in FIG. 2 (c), and the central floor slab portion 1A and the side floor slabs on both sides are folded. The connecting portions with the plate portions 1B and 1B are temporarily tightened, and the other portions are permanently tightened.

(4) Next, the blocks of the steel deck spar 1 temporarily assembled in this way are connected to each other in the erection direction, and the steel slab girder 1 is sent out little by little in the erection direction by the delivery device 7. In this case, only the steel slab girder 1 is sent out, and the hand-roller is not used because it requires a wide construction yard. For this reason, the fed steel deck spar 1 supports the vents 8 by arranging them at predetermined intervals in the installation direction. In this case, a jack 9 is interposed between each vent 8 and the steel deck spar 1.

(5) When the steel deck slab 1 sent out in this way reaches a predetermined position, the jack 9 installed on each bend 8 is jacked down and the steel deck slab 1 is installed at a predetermined position. Further, the side floor slab parts 1B and 1B folded on the central floor slab part 1A are lowered horizontally on both sides of the central floor slab part 1A.

  In this case, the side floor slab portions 1B and 1B are lowered horizontally on both sides of the central floor slab portion 1A while being supported by a winch (not shown) or pushed by a horizontal jack (not shown). Then, final fastening of the connecting portion between the central floor slab portion 1A and the side steel floor slab portions 1B and 1B and coating of the central floor slab portion 1A and the side steel floor slab portion 1B are performed.

  The invention of the present application is a place where a sufficient work yard cannot be secured around, such as a bridge over a road, a railroad, or a river, for example, and it is extremely short and efficient without adversely affecting the surrounding environment. A bridge can be erected.

An example of a steel deck slab is shown, (a) is a sectional view showing a developed state, (b) is a sectional view showing a folded state. An example of the construction method of a bridge is shown, (a) is a side view, (b) is a plan view, and (c) is a sectional view of a bent steel deck slab.

Explanation of symbols

1 Steel deck girder (superstructure)
1A Central floor slab part 1B Side floor slab part 1a Main girder 1b Cross beam 1c Floor steel plate 1d Reinforcement rib 1e Asphalt pavement 2 Pier (under construction)
3 Trailer 4 Existing steel slab girder 5 Crane 6 Carriage 7 Delivery device 8 Vent 9 Jack

Claims (2)

  A bridge erection method in which the entire length of the superstructure is constructed by gradually sending it out in the construction direction while constructing the superstructure of the bridge, wherein the superstructure is bent and sent out in a direction perpendicular to the construction direction. Erection method. A bridge superstructure unit used for a bridge in which the overall length of the superstructure is constructed by gradually sending it out in the construction direction while constructing the superstructure of the bridge, and a central floor slab in a direction perpendicular to the construction direction of the bridge And a side floor slab portion located on both sides thereof, and the side floor slab portion is connected to a side portion of the central floor slab portion so as to be bendable in a direction perpendicular to the installation direction. Bridge superstructure unit.

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