JPS5819804B2 - Construction method of concrete truss - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing concrete truss beams constituting railway bridges, etc., and its purpose is to provide a method that can easily and reliably construct large truss beams.

Currently, the development of concrete truss bridges is being researched to address the noise and economic issues associated with steel railway bridges.

By the way, the beam height of this concrete truss bridge is 4~5rr.
Because it is large, with a span of 40 to 60 m, there are various problems with the construction method.

Particularly during manufacturing, it is difficult to pour concrete all at once, and it is necessary to assemble unit members.

This invention has been developed to meet the above-mentioned needs.

An embodiment of the present invention will be described with reference to the drawings. In FIG. Small protrusions 5, 5 are formed at the joints of the unit trusses at the ends of the upper and lower horizontal members of the member 4.

In this invention, first, a form (not shown) is assembled so that the unit truss 1 is formed horizontally, reinforcing bars are placed in the form, and then concrete is poured into the form.
The concrete is cured and hardened to form a unit truss, and then, after or during demolding, the unit truss is erected vertically as shown in Figure 2, and a plurality of these unit trusses 1 are installed at the upper and lower vertical joints 7. A truss of a predetermined length is bonded by bonding with mortar, synthetic resin adhesive, etc.
For example, it is assembled and erected to a length corresponding to the span of a bridge.

FIG. 3 shows another embodiment of the unit truss, which is composed of horizontal members and diagonal members, and is constructed by connecting a plurality of triangular lattices.

This invention has the above-mentioned configuration, and since the unit truss with the triangular lattice structure is formed horizontally, construction is relatively easy, and after erecting each unit truss, vertical joints Since it is joined, erection work is easy,
Furthermore, since the unit trusses erected at a site where erection is easy are assembled into spans, the erection work can be carried out easily and quickly.

[Brief explanation of the drawing]

The drawings are detailed explanatory views of the invention, and FIG. 1 is a front view;
FIG. 2 is a side view, and FIG. 3 is a front view of another embodiment. 1...Unit truss, 2...Horizontal member, 3
...Diagonal member, 4...Vertical member, 5...
...Small protrusion, 6... Joint concrete, T...
・・・Vertical joint.

Claims (1)

[Claims] 1 Assemble the formwork so that each unit truss, which has a triangular lattice grid of precast reinforced concrete structure and has connecting protrusions formed at the upper and lower chord positions, is molded horizontally,
A concrete truss characterized in that the concrete is then poured into a formwork, the concrete is cured and hardened, the unit truss is erected vertically, and joint mortar is poured into the vertical joints between the vertically opposing joint protrusions to assemble the concrete truss. construction method.