JPH0726366B2 - How to build a PC bridge girder on an inclined surface - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC bridge girder erection method on a slope for constructing a bridge for attaching a track such as a sidewalk or a cable car to a steep slope such as a hillside.

[0002]

2. Description of the Related Art Generally, a precast PC is used as a method for constructing a PC bridge girder between bridge piers such as a bridge or an elevated road.
A method of hoisting the girder with a crane and hanging it between the piers,
A method of sliding in the longitudinal direction from one pier side to the other pier side, extending the cantilever from both piers sequentially with cast-in-place concrete or precast blocks,
A common method was to join both cantilever beams at the center of the pier.

[0003]

However, the inclination angle is 2
To lay a PC girder along an inclined surface of 0 to 30 degrees, the working conditions do not match any of the above-mentioned conventional methods,
It cannot be used. So, in the past, we built a foundation on an inclined surface,
It was inevitable to cast girders and decks on it with cast-in-place concrete. However, in this method, since it is a sloping ground, a large amount of labor is required for the supporting work of the formwork assembly, and a large-scale device is also required for carrying in concrete,
There was a problem that the cost was remarkably high and the construction period was long at the same time.

In view of such conventional problems, the present invention has an object to provide a method of erection of a PC girder on an inclined surface, which can be easily constructed by using an inclination and can be carried out in a small amount of on-site work.

[0005]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are to provide a prestressed space between abutments constructed at intervals above and below an inclined surface. When a concrete bridge girder (hereinafter referred to as a PC bridge girder) is bridged, a large number of girder blocks having a shape obtained by cutting the PC bridge girder in a direction orthogonal to its longitudinal direction are formed in advance, and the girder is formed along the inclined surface. Laying a rail for block downhill, loading each girder block on the rail from the slope above ground and sliding down sequentially, after sequentially joining each girder block from the abutment on the lower side via an adhesive, A method of constructing a PC bridge girder on an inclined surface is characterized by tensioning and integrating PC girder blocks between the girder blocks.

[0006]

According to the PC girder erection method of the present invention, a foundation is laid on a predetermined portion of the sloping ground by a method similar to the conventional method, and a bridge abutment is constructed on it. After that, a rail is attached so as to be supported on the abutment and the inclined surface, but this rail may be any one as long as it can support the weight of the PC bridge girder installed as a whole.

The girder block is preliminarily formed into a shape in which the PC bridge girder is cut in the width direction, and a PC steel wire insertion hole for continuously penetrating each PC bridge girder is formed through the PC steel wire insertion hole. Slide down with the inserted. Then, the PC steel wire is tensioned in a state where the girder blocks are joined to a certain girder length, and prestress is applied in the girder length direction. As a result, the girder blocks are integrated into a rigid structure. In this way, the PC steel girder is tensioned by the required length to form a PC bridge girder with an integral length.

The tension of the PC steel material may be performed at one time over the entire length, or the PC steel material may be penetrated after the respective girder blocks are joined.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

In the figure, 10 is an inclined surface, and 11 is an abutment integrally formed on a foundation constructed in the inclined surface 10. The foundation and the abutment 11 are molded by using cast-in-place concrete as in the conventional case.

After constructing a required number of abutments 11 at predetermined intervals, steel beams 12, 12 for laying rails are bridged in parallel between the abutments 11, 11 ... And between the lower surface and the inclined surface 10. The required number of columns 13 are stood upright and held. Sleepers 14, 14 ... are fixed to the steel beams 12, 12, and two rails 15, 15 are mounted on the sleepers 14, 14.
1, 11 ... Lay continuously on top.

The girder block 16 is loaded on the rails 15, 15 laid along the inclined surface in this way, and is slid down from the upper ends of the rails 15, 15. Digit block 16
Is a bridge girder 17 that is bridged over each abutment 11, 11, ..., Cut in a direction orthogonal to the longitudinal direction, that is, preliminarily formed into a ring shape. As an example, as shown in FIG. , 16a Floor slab 16b and wall balustrade 16
Bridge girder 17 that has c and 16 integrally and has an overall width of about 8 m
Is cut into a length of about 2 m.

The digit block 16 includes digit portions 16a, 1
6a has a plurality of PC steel material insertion holes 18, 18 ... Opened therethrough in the girder length direction, and at the bottom thereof, a trough 19 is fixed at two positions corresponding to the rails 15, 15 as shown in FIG. There is. In order to fix the sinker 19, a required number of anchor nuts 20 are embedded at the time of molding the girder block, and bolts 21 are screwed into and fixed to the anchor nuts 20. A shoe 22 is fixed to the lower surface of the shoe 19, and an antifriction material is applied to the surface of the shoe 22 to make it slip well.

When the girder block 16 slides down, a towing carriage 23 is loaded on the rails 15 and 15, and the carriage 2
3 is made to be able to move up and down with a winch 24 via a towing rope 25.
The girder block 16 is loaded on 15 and is connected to the carriage 23 with the connecting rope 26.

In this state, the winch 24 is operated to lower the carriage 23 to slide down the girder block 16. At this time, the PC steel material 27 is inserted into the PC steel material insertion hole 18.
The girder block 16 is slid down while sliding through the insertion hole 18.

In this way, each digit block 16, 16 ...
Are successively slid down and the lowermost girder block 16 is brought into contact with the lowermost abutment 12a to be sequentially joined. This bond is
Both are carried out with the rails 15 and 15 loaded.
Cement milk or resin adhesive is applied between the girder blocks 16, 16 ... to integrate them. When the bridge girders 17 formed by the girder blocks 16, 16 ... Have reached the length over the abutments 11, 11 adjacent to each other, the PC steel material 27 is tensioned by the jack at the uppermost end thereof, and the press toss are introduced and fixed. Digit block 1 in the same way
6 are successively slid down, the PC steel material 27 is tensioned at a constant length, and the bridge girder is extended to the uppermost end to form a PC bridge girder 17 in which prestress is introduced by the PC steel material 27 over the entire length. After that, the PC bridge girder is supported on the abutments 11, 11 ... From the rails 15 and 15, and the rails 15 and 15, the sleepers 14, the steel beams 12 and the columns 13 are removed.

The introduction of the prestress may be performed simultaneously over the entire length of the bridge girder 17 after all the girder block joining is completed.

[0018]

As described above, in the present invention, a large number of girder blocks each having a shape obtained by cutting a bridge girder into a circular slice are preformed, and the girder blocks are slid down on rails installed between abutments and sequentially joined. , By passing through the PC steel material and tensioning it, and introducing prestress over the entire length so that the entire length becomes an integrated PC bridge girder,
The girder block is the largest heavy object that needs to be lifted, and even if the girder block is large, it can be several tons. Furthermore, transportation on an inclined surface slides down on the rail by its own weight. Because
The work is significantly simplified compared to the conventional handling of precast girders, it can be installed safely and efficiently with less work, and it can be constructed at low cost in a short period of time.

[Brief description of drawings]

FIG. 1 is a side view showing a construction state of an embodiment of a method of the present invention.

FIG. 2 is an enlarged sectional view of the above.

FIG. 3 is a side view of the same.

FIG. 4 is an enlarged cross-sectional view of a portion on the rail of the girder block of the above.

FIG. 5 is a side view of the bridge girder installation completed state.

[Explanation of symbols]

 10 inclined surface 11 abutment 12 steel beam 13 pillar 14 sleeper 15 rail 16 girder block 16a girder part 16b floor slab part 16c wall balustrade part 17 bridge girder 18 through hole 19 sinker 20 anchor nut 21 bolt 22 shoe 23 cart 24 winch 25 tow rope 26 Connection Rope 27 PC Steel

Claims (1)

[Claims] 1. When a bridge girder made of prestressed concrete (hereinafter referred to as a PC bridge girder) is bridged between abutments constructed at intervals above and below an inclined surface, the PC bridge girder is oriented in a direction orthogonal to its longitudinal direction. A large number of cut girder blocks are formed in advance, a rail for girder block sliding down is laid along the inclined surface, and each girder block is loaded on the rail from the inclined ground portion and sequentially slid down. A method of erection of a PC bridge girder on an inclined surface, which comprises sequentially joining the girder blocks from above on the abutment on the lower side with an adhesive and then tensioning and integrating the girder blocks with PC steel material.