JPS649403B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing bridges, elevated buildings, and other elevated structures supported by girders using a prestressing method.

In order to construct, for example, a long bridge using this construction method, a movable scaffold called a "Falbauwagen", that is, a main truss (frame) is usually used, and the long bridge is constructed by sequentially pouring concrete.

The main truss can be moved on rails installed on the deck of the existing bridge body, and once the concrete has been poured and hardened using the main truss, the rails can be moved onto the deck of the newly added bridge body. The main truss is moved forward along the rail, and the main truss is used to install formwork, pour concrete,
We will proceed with work such as introducing pre-stress.

By the way, the main truss suspends and supports heavy objects such as work scaffolding, and a considerable load is applied to the bridge body that supports it. Therefore, rails are usually laid on the floorboard where the bridge girder is located, and the main truss is directly supported by the bridge girder.

In this case, if the long bridge is a straight one, it is possible to construct a long bridge by laying rails on the floorboards along the bridge girders, moving the main truss as the work progresses, and pouring concrete in sequence. In the case of a long bridge that is curved, or in the case of a long bridge that changes in width, the position of the bridge girder also changes accordingly, and the curvature or width of the bridge changes accordingly, and conventional construction methods cannot appropriately deal with this. The main truss had to be supported on a different floorboard, or the main truss had to be repaired each time.

The present invention was made to solve the drawbacks of conventional construction methods, and even if it is a long bridge with a curve or a long bridge with varying width, the main truss is always supported on the bridge girder, and the formwork is properly supported. Installation, concrete pouring,
The present invention aims to provide a construction method for bridges, viaducts, buildings, and other elevated structures supported by girders using the prestressing method, which allows work such as introducing prestressing to proceed.

Therefore, in the present invention, slippers are installed and fixed on the floorboard on which the girder is located, a horizontal beam is stretched and fixed between the slippers, and the rails of the main truss are laid on the horizontal beam. As a result, if the width of a structure to be constructed horizontally, such as a long bridge, changes and the distance between the bridge girders changes, for example, if the bridge becomes wider, the load of the main truss will always be supported on the bridge girders using long horizontal beams.

Embodiments of the present invention will be described below with reference to the drawings, taking as an example a case where a long bridge is constructed by the construction method of the present invention.

In the figure, 1 is the existing bridge part, and the illustrated example shows the case of building a bridge that is gradually wider than the standard bridge width. It's changing. Slippers 4, 4 are installed and fixed on the existing floorboards 3a, 3a where the bridge girder 2 is located, and a horizontal beam 5 is installed between the slippers 4, 4.
Strap and fix a and 5a. Also slippers 4,4
A lateral beam 5b is directly installed and fixed on the existing floorboard 3 between the lateral beams 5a, 5a spanned between them. On the transverse beams 5a, 5a, 5b thus provided, rails 6, 6, on which a main truss, generally designated 8, runs are laid. Rails 6, 6 are horizontal beams 5
a, 5a, 5b, and is removably fixed to
Behind it, it is fixed to the existing floorboard 3 using a rail fixing member 7.

The main truss 8 has a nearly diamond-shaped framework when viewed from the side, and in the middle of the main truss 8 is a rail 6,
6, and a main jack 1 that raises the main truss 8 and lifts the wheels 10, 10 from the rails 6, 6 when moving the rails 6, 6 forward.
1, and a propulsion jack 12 for moving the main truss 8 forward along the newly laid rail. A wire rope 16a is attached to the cross beam 9.
Alternatively, a work scaffold 17 is suspended by a rod 16b, and an anchor jack 15 is provided at the rear end of the main truss 8 to cope with the load, and a PC is tightly connected to the bridge girder 2 via the rear transverse beam 5c. The rear end of the main truss 8 is pushed down by a steel rod. Other main truss 8 has each jack 11,
Hydraulic pump unit 1 that operates 12 and 15
3. Rear wheel 1 clamping the flange of rail 6
4 etc.

During work, the wheels 10, 10 are
is lifted from the rails 6, 6 by a jack (not shown), and the rear end of the main truss 8 is pressed downward by the anchor jack 15 via the rear transverse beam 5c.

In this state, the work scaffold 17 suspended from the cross beam 9 provided on the main truss 8 is used to perform work such as formwork installation, concrete pouring, and prestress introduction. Once the concrete has hardened, a separately prepared slipper 4 is installed and fixed at the position where the bridge girder 2 of the newly added floor plate 3 is located, and the horizontal beams 5a, 5a are stretched over it and fixed.

Next, the rail fixing member 7 that fixes the rails 6, 6 is removed, and the floorboard 3 with the rails 6, 6 added.
The horizontal beam 5a newly installed by moving in the direction of
Place and fix on 5a. When the movement of the rails 6, 6 is completed, the main truss 8, which has been raised until now, is lowered by the main jack 11, and the wheels 10 are brought into contact with the rails 6, 6. Also, the main truss 8 is raised by the jack 15, and the rear wheel 14 is brought into contact with the flange of the rail 6. Next, the propulsion jack 12 is operated, the main truss 8 is moved to a predetermined distance, and the wagon is set.

Then, as described above, new floorboards 3 are added by installing formwork, pouring concrete, introducing prestressing, etc.

In addition, the horizontal beam on which the rail is placed can be of a sliding type, and the horizontal beam can be expanded and contracted according to the girder spacing, and there is no need to prepare a special structure for the main truss, and a conventionally known one can be used. can be used as is.

As explained above, according to the construction method of the present invention, even if the width of a structure supported by girders, such as a long bridge, changes, the main truss and the load applied to it are always supported by the girder. Work safety can be ensured, and the structure will not be adversely affected.

Furthermore, the conventional main truss can be used as is, and the cost will not be high at all, as the equipment can be provided with a transverse beam and a slipper.

[Brief explanation of the drawing]

The drawings show an example in which the construction method of the present invention was implemented for constructing a long bridge. Figure 1 is a plan view, Figure 2 is a side view, and the left half of Figure 3 is a line taken along the line A-A in Figure 2. The right half of the view is a view taken along the line B--B in FIG. 2. 1... Existing bridge part, 2... Girder, 3... Floor plate, 3
a...Floor plate part where the girder is located, 4...Slippers,
5...Horizontal beam, 6...Rail, 7...Rail fixing member, 8...Main truss, 9...Horizontal beam, 10
... Wheels, 11 ... Main jack, 12 ... Propulsion jack, 13 ... Hydraulic pump unit, 14
... Rear wheel, 15 ... Anchor jack, 16a
...Wire rope, 16b...Bar material, 17...Work scaffolding.

[Claims]

1. In the method of constructing an elevated structure using the prestressing method, the central part of the floor plate supported by girders is cast by a main truss that is movable in the longitudinal direction and has a work scaffold on the side in the direction of movement, and the floor plate is The side parts following the central part of the concrete are poured by means of a main truss for side pouring which is smaller than that used for central part pouring and which is movable in the longitudinal direction and has a working platform on the side perpendicular to the direction of progress. A method for constructing elevated structures using the prestressing method, which is characterized by constructing the structure using prestressing methods.