JPH0364004B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a method of constructing a bridge, and in particular a box girder structure that has a large span, has piers and abutments, and is mainly made of steel. Alternatively, the present invention relates to a method of constructing a bridge having an I-girder structure bridge body.

(Prior art) For example, a bridge as shown in FIG. 12 has piers 2, 2 between abutments 1, 1, and shoes 3, 3, etc. In the construction of a bridge in which the girder structure bridge body 4 is erected, conventional cable erection methods and overhang methods are generally adopted.

Among them, the overhang construction method, as shown in Fig. 12, involves erecting four parts of the bridge body using construction supports 5, 5, etc., and then sequentially moving from section A to section B while fixing the four sections of the bridge body. The structure is made to extend out.

In addition, as an alternative method of overhang construction, as shown in Fig. 13, after assembling the girder of the bridge body 4 at the work site behind the abutment 1, a hand rolling machine 6 is installed at the tip, and the girder is installed at the work site. Installed rail 7 or pier 2
Some are designed to be sequentially pulled out and installed in a predetermined position via rollers 8 or a sliding device provided on the top (see publication, Railway Bridge Construction Handbook, published by Japan Road Association).

(Problems to be Solved by the Invention) However, the conventional overhang construction method described above has a major problem in that it requires a large amount of construction materials and equipment including shoring.

The reason for adopting the above construction method is that abutment 1 and pier 2
The bridge body 4 is supported by shoes 3, 3, etc., which can be rotated or rotated and horizontally moved on the upper part of the bridge, and the side that should serve as a counter is adopted due to the structure in which this load is transmitted to the abutments 1 and piers 2 of the substructure. This is because the overhang method cannot be used without a bridge body for the span.

Furthermore, when the construction of the entire bridge is completed, it is necessary to raise and lower the shoes 3 on the piers 2 in order to release the initial stress introduced during construction, but since the bridge body 4 is huge, the above work is not necessary. This is extremely dangerous and extremely difficult work.

Especially during the erection of the bridge body in the above-mentioned overhanging work,
Since the work will proceed with the bridge body temporarily fixed,
There were various problems such as the fact that they were often placed in extremely dangerous conditions under the load of abnormal events such as earthquakes and typhoons.

[Structure of the invention]

(Means for solving the problem) In order to solve the above problem, the bridge body is made of a girder structure made of members mainly made of steel, and the piers are made of concrete, etc., in the middle of the girder structure. The fulcrum part is rigidly connected to the top or left and right sides of the pier as a containment part, and the unit members of the bridge body are connected to the connecting part rigidly connected to the pier, and the unit members of the bridge body are sequentially stretched out and the bridge body is rigidly connected and integrated with the pier. It is characterized by:

(Embodiments) The present invention will be described below with reference to embodiments shown in FIGS. 1 to 11, using the same reference numerals to the same members as in FIGS. 12 to 13.

FIGS. 1 and 2 show the entirety of a bridge constructed using the construction method according to the present invention. The bridge shown in FIG. 1 is a case in which the bridge body is rigidly connected to the upper part of the piers.
Figure 2 shows a case in which the bridge bodies are rigidly connected to the left and right sides of the piers.

In the present invention, the fulcrum upper member, which is a member constituting the intermediate fulcrum part of the girder structure bridge body 4, is attached to the connecting part 10, on the bridge pier 2 mainly constructed of concrete.
They are rigidly connected as 11,11.

3 to 5 show examples of the installation structure of the above-mentioned connecting parts 10 and 11.

In the case shown in the third figure, the anchor bolt 12 is buried in a predetermined position during construction of the pier 2, and the connecting part 10 is rigidly connected to the upper surface of the pier 2 by connecting the fulcrum member to the anchor bolt 12. It is said to be a pier structure in the form of

In the case of Fig. 4, the PC steel rod 13 is installed at a predetermined position during construction of the pier 2, and this PC steel rod 13
The bridge pier structure is such that connecting parts 11, 11 of the bridge bodies 4, 4 are protruded from both sides of the bridge pier 2 by connecting a fulcrum upper member to the bridge pier 2.

In the case shown in Figure 5, anchor bolts 12 and PC steel bars 13 are installed at predetermined positions during construction of the pier 2, and by connecting the support members to these, the bridge body is attached to both sides of the pier 2. The bridge pier structure is such that the connecting portions 11, 11 of No. 4 are protruded.

The procedure for constructing the bridge body 4 is to connect the next main girder members 15, 15 to the connecting parts 10, 11 integrally formed on the bridge pier 2, as shown in FIGS. 6 to 8.

In this way, the main girder members 15 are successively connected, and the bridge bodies 4 are extended to the left and right of the piers 2, and finally, the bridge bodies 4 are extended from both piers 2, 2 at the center of the span O in Fig. 1. The bridge bodies 4, 4 are connected to complete the construction between the piers 2, 2.

In addition, the bridge body 4 extended on the opposite side of the piers 2, 2,
4 is connected on the abutment 1,1 to complete the construction between the abutment 2,2 and the abutment 1,1.

Note that, as shown in FIGS. 9 to 11, the lower flange portion 15A of the main girder member rigidly connected to the joints 10 and 11 of the pier 2 can be reinforced with reinforced concrete 16. By doing this, the lower flange of the main girder near the pier will have a composite structure with concrete, making it possible to maintain sufficient strength at the part that receives the largest compressive load.

〔Effect of the invention〕

As explained above, the present invention has a girder structure in which the bridge body is made of members mainly made of steel, and the bridge piers are made mainly of concrete, etc., in which the members constituting the intermediate fulcrum part of the girder structure are assembled. The bridge is constructed by rigidly connecting the bridge body to the top or left and right sides of the bridge piers, connecting the unit members of the bridge body to the joints rigidly connected to the piers, and sequentially extending them, and then rigidly connecting the bridge body to the piers and integrating them. As a result, it is possible to significantly reduce the amount of construction materials and equipment that are indispensable when constructing a bridge using the conventional overhang method, and the economic effects obtained are extremely large.

In particular, when constructing the bridge body by extending it from the piers, it is not temporarily fixed as in conventional construction methods, but is rigidly tied, so it is extremely safe even under abnormal loading conditions such as earthquakes or typhoons during the construction period. There is.

In addition, since this is a construction method in which the bridge body is integrated with the piers, it is possible to partially make the compression side structural members of the girder bridge a composite structure of steel and concrete, making it more economical when designing components. design.

Further, according to the method of the present invention, there is no need to use expensive shoes, so construction costs can be reduced, and various superior effects can be obtained compared to the conventional overhang construction method.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a bridge constructed by the method of the present invention, Fig. 2 is a front view showing another example of the same, and Figs. 3 to 5 are structural examples of bridge pier joints according to the present invention. FIGS. 6 to 11 are explanatory views showing the construction order in each of the above examples, and FIGS.
Figures 1 and 13 are explanatory diagrams showing the conventional overhang construction method. 1... Bridge abutment, 2... Pier, 4... Bridge body, 10, 11
...Joint part, 15...Main girder member.

Claims (1)

[Claims] 1 The bridge body is a girder structure made of members mainly made of steel, and the piers are made of concrete, etc. In the construction of a bridge, the members that make up the intermediate support part of the girder structure are rigidly connected to the top of the piers or to the left and right as connecting parts. A method of constructing a bridge, characterized in that the unit members of the bridge body are connected to joints rigidly connected to the piers, and the unit members of the bridge body are successively stretched out, and the bridge body is rigidly connected and integrated with the piers.