SU109748A1 - Heavy-duty precast concrete supports for the temporary restoration of bridges - Google Patents

Description

BACKGROUND OF THE INVENTION The invention relates to prefabricated reinforced concrete supports of a spherical type for the temporary restoration of bridges.

Known such supports, assembled from individual reinforced concrete blocks-frames installed in horizontal or vertical planes, have low spatial rigidity and a large proper weight.

In the described supports these disadvantages are largely eliminated. This is achieved by the implementation of the main element of the support in the form of an H-shaped reinforced concrete block.

This type of block allows better support of the spatial rigidity of the support and ease its weight.

FIG. 1 shows the main element of the support; in fig. 2 - support; in fig. 3 and 4 — approximate execution of a support on a massive foundation in two projections; in fig. 5 - support on the pile foundation; in fig. 6 - detail of fastening the support to the pile foundation.

According to the invention, the main support element is a block / H-shaped, consisting of two legs connected by a spacer.

The strut at the point of attachment to the posts has bends. For connecting the racks to each other, flanges 2 of sheet steel are fixed to their ends. Block 3, which consists of a rectangular beam with prestressed reinforcement, is designed to design the top of the support, lean on the piles or the laying of the foundation, as well as to change the interval of the height of the support.

Blocks 3 are also fitted with flanges for fastening.

The assembly of the support is carried out mainly by the connection along the height of the posts of the elements /, which in the plan form a square 4.

By adding to the square of the adjacent squares connected to it 5 of the same elements, one can create an extension of the support to increase its longitudinal or transverse stability. Base under

precast supports can serve as a surviving masonry foundation 6 or pile 7.

When building a support on the masonry of the surviving foundation 6, first two blocks 5 are laid on the cement mortar.

When the masonry surface is even, the mortar may be replaced with dry cement.

The metal flanges on the side of the foundation at block 3 are cut. The unit / is mounted on unit 5 so that the flap 2 of its stand fits tightly between the flanges of unit 3 to ensure stability in one direction. In the perpendicular direction, stability is ensured by placing bolts in the holes of the flanges of the blocks 5.

Bearing the support on the pile foundation with a pressure on the pile up to 13 tons is carried out by direct laying on top of the piles of blocks 3 (Fig. 6). With more pressure on the pile, the nozzle is reinforced by adding an additional padding row 8 from the blocks 3. Laying the blocks 5 directly onto the pile face eliminates the process of seeing the tree across the fibers. The blocks 3 are fixed on the heels with help; and the earrings 9 attached to the heels by bolts.

The advantages of the proposed construction are: uniformity of elements; Malge consumption of materials and, accordingly, the low weight of the supports; ease of providing spatial rigidity to the structure; ease of drying, enlarged assembly; simplicity and speed of installation.

The low weight of the elements makes it possible to dry the installation of the supports by means of small-scale mechanization.

Subject invention

Combined reinforced concrete supports of the same type for temporary restoration of bridges are distinguished by the fact that, in order to ensure the spatial rigidity of the supports and facilitate their weight, the main element of the supports is made in the form of a U-shaped reinforced concrete block.

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