JPS5944407A - Prestressed concrete bridge constructing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for constructing the superstructure of a prestressed concrete bridge section by section between piers that have been constructed in advance.

The equipment traditionally used in the prestressed concrete bridge construction method is one in which the front and rear formwork devices are suspended from the feed girder installed on the bridge superstructure via hanging frames. The main bridges to be built are box girder bridges with a single-room superstructure, and the width that can be constructed is limited to 15 meters at the most.

However, recently, there has been an increase in the construction of road bridges with large widths, such as double box girder bridges with one room or double box girder bridges with one room and two rooms, and it has become difficult to construct these bridges all at once. The need is increasing.

In view of the above-mentioned circumstances, the present invention aims to provide a prestressed concrete bridge construction device that is capable of constructing large-scale bridges all at once.

Next, the configuration of the present invention will be described with reference to an embodiment shown in the drawings.

In the drawings (Figures 1 to 5), 1 is the part of the prestressed concrete bridge that has been completed, 2 is the pier of that part, and 3 is the pier of the part where the bridge will be constructed next. is constructed in advance prior to the construction of the bridge, and prestressed concrete bridges 4 are sequentially constructed for each section, centering on the piers 3, toward the front and rear of the piers. Bridge 1 and bridge 4 constitute a fixed double box girder bridge. 5 is a pair of feed girders, and this pair of feed girders 5 is supported by three mounts 6 in the front and rear on the superstructure of the bridge 1 where the construction has been completed and the bridge 4 which is partially under construction. The pair of feed girders 5 are arranged side by side at a constant interval. Each frame 6 is composed of a support beam 7, a sliding beam, a required number of hydraulic jacks 8, etc., and the frame 6 moves and supports the feed girder 5 in the direction of the bridge axis, the direction perpendicular to the bridge axis, and the vertical direction, respectively. Changes in web spacing can be easily accommodated by inserting pillow material. Reference numeral 9 denotes a hanging frame, and this hanging frame 9 is formed by attaching an arch-shaped frame 11 to the upper part of a base frame 10. The base frame 10 is supported by a plurality of movable carts 12 equipped with hydraulic jacks and rollers.
It is supported by a pair of feed girders 5 via the support so that it can be moved and fixed freely. Both end portions of the hanging frame 9 extend on both sides of the pair of feed girders 5, and a formwork device 14 is suspended from the both side projecting portions of the hanging frame 9 by means of eight eyepers 13 at four locations. The formwork device 14 includes an inner formwork 1
5 and an outer formwork 16. Inner formwork 1
5 is a general formwork support, which is assembled and dismantled each time a bridge is constructed for each section. The outer formwork 16 is a framework in which main girders 17 on both sides and the center are connected by a plurality of longitudinal girders 18, and a bottom formwork 19 and side formworks 20 are provided. The main girder 17 of the outer formwork 16 is divided into four parts, each of which is joined by a bin 21 to form a single body, which is split into left and right sides at the center, and furthermore, each part can be folded into two. A plurality of winches 22 installed within the hanging frame 9 are used for folding operations. Outer formwork 1
The bottom formwork 19 of No. 6 has a flat floor shape, and the side formwork 20
can be mounted by freely moving on the bottom formwork 19. Reference numeral 23 denotes a plurality of hanging steel rods, which connect the bottom formwork 19 of the outer formwork 16 to the hanging frame 9 during concrete pouring.
It is a reinforcing material that is hung on.

Note that trolley hoist rails 24 and 25 are provided on the feed girder 5 and the hanging frame 7, and necessary trolley hoists are installed on each of them. One formwork device 14 is provided at the front and back.

To construct a prestressed concrete bridge using the device configured as shown in the paper, a pair of feed girders 5 are moved from the superstructure of the bridge 1 that has been completed onto the piers 3 on which the bridge will be constructed next, and the pair of feed girders 5 are Using the front and rear formwork devices 14 suspended from the girder 5 via the suspension frame 9, a superstructure of a beam 4 of Km in the bridge axis direction is constructed by overhanging the front and rear sections, centering on the pier 3. Thereafter, the same steps as described above are repeated to sequentially extend and construct the superstructure of the bridge 4 for each section, thereby completing the closing section at the tip of the existing bridge 1 and the corresponding cantilever section.

By the way, a pair of feed girders 5 are arranged side by side at a constant interval on the bridge superstructure, and a formwork device 14 is attached to the pair of feed girders 5 via hanging frames 9 extending on both sides thereof. IN!
! Since the formwork device 14 is vertically mounted, it can be kept in a stable and safe position even if the formwork device 14 is to construct, for example, a two-chamber box girder bridge or a one-chamber and two-chamber double box girder bridge. Formwork device 1 that can hold up to 40 meters in the direction perpendicular to the bridge axis
4 can be equipped with suspension. Therefore, it is possible to construct bridge superstructures up to a maximum width of about 38 meters at once.

Further, in the formwork [14], since the bottom formwork 19 of the outer formwork 16° has a flat floor shape, the mounting position of the side formworks 20 can be changed freely. For this reason,
Even if the width of the bridge superstructure varies greatly and the web position changes suddenly, such as the ramp section of a road bridge,
Construction can be done accordingly. The fact that the bottom formwork 19 is shaped like a flat bed allows the remaining part of the formwork to be used as a work floor.

The outer formwork 16 is structured so that it can be folded from the center to the left and right sides, so even if it is a large pier such as a rigid-frame pier that is wide in the direction perpendicular to the bridge axis, the formwork device 14 can be passed through as is, greatly improving the workability of bridge construction.

Furthermore, in addition to the pair of feed girders 5, the hanging frame 9 is also provided with trolley hoist rails 25, and by equipping the trolley hoist, various operations can be performed more easily and efficiency can be improved.

In summary, the present invention is an apparatus for constructing a prestressed concrete bridge section by section between piers that have been constructed in advance, and which includes a pair of feed girders that are installed in parallel at regular intervals on the bridge superstructure. A suspension frame is installed on the pair of feed girders, and a suspension frame that is orthogonal thereto and can be freely moved and fixed in the bridge axis direction, and formwork devices are equipped on both side overhangs of the suspension frame. Therefore, even if the formwork equipment is large in size, it can be safely suspended in a stable posture from a pair of feed girders via a hanging frame. It is possible to construct large bridges at once, such as double box girder bridges or double box girder bridges with one room and two units, and it is possible to improve workability and efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the prestressed concrete bridge construction apparatus according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is a partial sectional view, and Fig. 3 is a side view of the same.
FIG. 4 is a cross-sectional view showing a state in which the outer formwork of the formwork device is folded on both left and right sides, and FIG. 5 is a side view of the same. 1... Bridge, 2.3... Pier, 4... Bridge, 5.
5... Pair of feed girders, 6... Frame, 9... Hanging frame, 13... Eye bar, 14... Formwork device, 15...
・Inner formwork, 16... Outer formwork, 19... Bottom formwork, 20
・−・Side formwork patent applicant Shimizu Corporation

Claims (2)

[Claims] (1) A device for constructing the superstructure of prestressed concrete bridges (P and C bridges) section by section between piers that have been constructed in advance, and is installed in parallel at regular intervals on the bridge superstructure. A pair of feed girders is provided, and on the pair of feed girders, a hanging frame that is perpendicular to the feed girders and that can be freely moved and fixed in the bridge axis direction is installed, and a formwork device is suspended from the overhangs on both sides of the hanging frame. Prestressed concrete bridge construction equipment characterized by: (2) Prestressed concrete bridge construction according to claim 1, wherein the formwork device is composed of an inner formwork and an outer formwork, and the bottom formwork of the outer formwork has a flat floor shape. Device. 1-