JPS5812892Y2 - concrete bridge - Google Patents

Description

[Detailed description of the invention] This invention relates to a concrete bridge using precast concrete members.

Conventionally known concrete bridges are those in which formwork is constructed on the piers, a reinforcing frame is placed inside the formwork, and then concrete is poured, or concrete slabs are connected with reinforced metal girders. It is known that these are fixed in parallel at right angles to the main girder, and the main girder, concrete deck slab, and L-shaped metal girder are connected to each other with bolts, but the former is not only complicated to work with, but also requires molding. The construction period is especially long in places where it takes a lot of time and effort to construct and remove the frame, and where concrete has to be built in stages after it has hardened, and the latter requires a large amount of work to reinforce the concrete slab. There were problems such as the need for reinforcing hardware, and the connection had to be done on-site.

However, this idea places the girder members on the foundation, erects the precast 1-concrete members in parallel on top of it, and provides the pavement on top of it, which not only significantly reduces the number of formworks, but also reduces the need for formwork support. Since there is almost no need to wait for the concrete to harden before proceeding with the work, the construction period can be significantly shortened.

Furthermore, since the precast concrete member is formed into a hollow body by centrifugal casting, the required strength can be obtained with a relatively small amount of material.

Therefore, it not only saves materials, but also makes the whole lighter.
The burden of holding each part's own weight can be reduced accordingly.

That is, to explain this invention with reference to an embodiment, ■-shaped steels 2, 2 are placed parallel to each other at regular intervals on a pier 1, and a hollow precast I/concrete member is placed on these ■-shaped steels 2, 2 at right angles thereto. 4, 4 are installed closely in parallel.

Reinforcing bars 3, 3 are protruded from both end faces of the precast concrete member 4, and a large number of sink reinforcements 5, 5 are protruded from one end face of the concrete member 4 to the precast 1. A large number of reinforcing bars 6 for pavement are installed in the reinforcing bars 3, 3 and the whiskers 5, 5 in parallel with the I-shaped steels 2, 2.
, 6 are hung to form a reinforcing bar net.

A paving material 7 is placed on both sides and the top surface of the precast concrete members 4, 4 configured as shown in E, and the whiskers 5, the tips of the reinforcing bars 3, and the paving reinforcing bars 6, 6 are buried in the paving material 7. The concrete bridge of the present invention is constructed as follows.

In the above embodiments, the precast concrete member is hollow and centrifugally cast, and if necessary,
Stress can be introduced by inserting a steel wire.

In the embodiment shown in FIG. 3, steel plates 8 are fixed to both ends of a precast concrete member and bolts 9 are used to fix them to type 1 steel 2, 2.

In each of the above embodiments, one precast concrete member is arranged closely in parallel in the width direction, but when the width of the bridge is wide, two or more precast concrete members can be arranged in series in the width direction.

In such a case, if the precast member is brought into contact with the surgical member and the precast concrete member and the girder are connected metallically, for example, as shown in Figure 3, the precast concrete will remain intact even if an unexpected external force is applied. There is no risk that the member will come off the girder member.

That is, according to this invention, the upper girder members of the pier 1 are placed in parallel at predetermined intervals, the hollow precast concrete members are erected in parallel on the upper girder members at right angles thereto, and the paving material is cast on top of these members. Since the bridge was constructed by integrating precast concrete members, on-site work was broadly divided into placing girder members, erection of precast concrete members, and pouring of paving materials. The work of placing concrete and dismantling formwork is significantly reduced, and there is no need to wait for the concrete to harden before restarting work, so the construction period can be significantly shortened, and precast concrete parts can be mass-produced at a factory, making it possible to Since high-quality, high-strength members can be prepared in the required quantity and at the required time, it is possible to construct a bridge that is relatively lightweight and has high strength and reliability in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of this invention, FIG. 2 is an enlarged perspective view of the construction in the middle, and FIG. 3 is an enlarged perspective view of another embodiment. 1... Pier, 2... ■Shape steel, 3...
...Reinforcing bars, 4...Precast concrete members, 5...Beard bars, 6...Reinforcing bars for pavement, 7...Paving materials, 8... ...Steel plate, 9.
·····bolt.

Claims (1)

[Scope of utility model registration request] Girder members are installed in parallel on the piers at predetermined intervals, and hollow precast concrete members are installed on the bridge piers parallel to each other at right angles to the girder members. Paving reinforcing bars are hooked to the ends of the reinforcing bars exposed on the surface, and the steel plates fixed to both ends of the precast concrete member are fixed to the girder members with bolts, and the sink bars and the ends of the reinforcing bars on both end faces and the steel plates are fixed. and a concrete bridge characterized by having reinforcing bars for pavement buried within the paving material.