RU217096U1 - MODULAR BLOCK OF NON-REMOVABLE FORMWORK OF PRECAST-MONOLITH REINFORCED CONCRETE POST OF BRIDGE STRUCTURES SUPPORTS - Google Patents

Abstract

The utility model relates to the field of construction, in particular bridge building, and can be used in the construction of bridge supports, overpasses, overpasses, columns of public buildings and other vertical structures made of prefabricated reinforced concrete. The utility model is aimed at increasing the strength and crack resistance of a reinforced concrete block by reinforcing the outer concrete layer of the wall on the inside of the block with a mesh of composite vertical and spiral reinforcement. The reinforced concrete wall of the block is made thin-walled, reinforced with meshes of composite reinforcement located in the median plane and in the outer layer of concrete of the wall on the inside of the block.

Description

The utility model relates to the field of construction, in particular to bridge building, and can be used in the construction of bridge supports, overpasses, overpasses, columns of public buildings and other composite structures made of prefabricated monolithic reinforced concrete.

A well-known design of a prefabricated-monolithic support of a bridge of a cross-sectional support of variable height, where composite reinforced concrete blocks in the form of panels are used as a non-removable formwork, interconnected and with monolithic concrete filling the rack of a wall structure, working together to perceive loads (see [2] , Patent for the invention "Precast-monolithic bridge support" RU No. 2107125 C1, IPC E01D 19/02).

The disadvantage of this formwork design, consisting of a set of vertically installed reinforced concrete panels, is its high labor intensity of installation, the presence of a large number of blocks and vertical joints around the perimeter of the support, and the need for constant monitoring of the state of the vertical joints between the formwork wall blocks. It should also be noted the low architectural expressiveness of the pillars and the need to heat the concrete during the winter concreting of the pillar.

A well-known design is a prefabricated-monolithic bridge support, where as a formwork, a non-removable formwork of a closed cross section is used, consisting of sections of reinforced concrete pile-shells with flanged joints, stacked on top of each other through a layer of binder solution ([3] Prefabricated monolithic supports. poznayka. org/s97704t1.html, / 12/06/2020 - p. 4, Fig. 2).

The disadvantage of this block design is that after the erection of a prefabricated monolithic support, sections of reinforced concrete pile-shells and horizontal seams between them require additional finishing work and the application of protective layers on the surface of the blocks in the conditions of the construction site. It should also be noted the low architectural expressiveness of the pillars of the supports and the need to heat the concrete during the winter concreting of the support. Such supports are used for significant loads on large bridges.

As a prototype, the construction of a non-removable formwork, of a closed cross section, consisting of reinforced concrete modular blocks with a protective paint and varnish decorative coating is considered ([3] Utility model patent RU No. 207719 IPC E01D 19/00, 19/02, 19/14. formwork of a precast-monolithic reinforced concrete pillar of bridge structures / Ivanov G.P., Trofimov D.D. / Application No. 2021100286 dated January 11, 2021 /

The utility model is aimed at increasing the strength and crack resistance of the block due to the double reinforced block wall with grids of vertical and spiral reinforcement made of composite material located in the median plane along the wall thickness and in the outer concrete layer of the wall on the inside of the block. On the upper plane of the block, a channel for the key connection of the blocks is made, and the vertical reinforcement of the grid is made with outlets beyond the lower plane of the block by a value of 3/4 of the radius of the key groove. The conjugation of the vertical and horizontal planes of the wall is made with a bevel at an angle of 45°.

The inner diameter of the block is determined by the diameter of the monolithic reinforced concrete pillar of the support and is selected from the assortment of steel pipes with diameters from 530 to 10220-1420 mm. The outer contours of the block can be round or polygonal. The height of the modular block is determined by the height of the rack from the edge of the grillage to the mark of the bottom of the support crossbar. The blocks are laid on a layer of polymer cement glue up to 3-4 mm thick. On the sections of the junction of the rack with the grillage and the crossbar of the support, the blocks are made of a smaller height and a different color of the coating. Thin-walled blocks are reinforced with a three-dimensional frame made of composite reinforcement, consisting of two meshes of the type of indirect reinforcement with spiral reinforcement with a coil spacing of no more than 100 mm. The inner mesh is located in the median plane of the block wall. The outer mesh is located on the inner surface of the block wall and is designed to absorb transverse deformations of the monolithic concrete of the body of the prefabricated-monolithic support post. On the outer edges of the walls, they are made with triangular chamfers with a leg of 3-5 mm. For the period of laying in-situ concrete and curing of in-situ concrete, butt joints of blocks can be temporarily fixed with an annular bandage made of strip steel on tie bolts.

The essence of the technical solution of the block is illustrated by drawings.

In FIG. 1 - the design of a reinforced concrete modular block of a non-removable formwork of a prefabricated monolithic support of a bridge, an overpass, an overpass is presented, indicating the parameters of the block (vertical section).

In FIG. 2 - a fragment of a horizontal junction of blocks.

In FIG. 1 and FIG. 2 shows the following parameters of the block: D - outer diameter of the block; d ₁ - inner diameter of the block along the bottom (calculated diameter of the supporting support made of monolithic reinforced concrete); d ₂ - inner diameter of the block on top (outer diameter of the metal pipe: d ₂ \u003d d ₁ + 20 mm); h - block height; t ₁ - wall thickness along the bottom of the block; t ₂ - wall thickness at the top of the block; t ₃ - the thickness of the outer mesh; t ₄ - the size of the leg of the chamfer on the outside of the junction of blocks; t ₅ - thickness of the glue line; S is the step of the helical reinforcement of the reinforcement of the block with grids C-1 and C-2; S ₁ - step of the vertical reinforcement of the block; S ₂ - the length of the outlets of the vertical bars of the grid of composite reinforcement; R - radius of the circular key on the top of the block.

The design of a modular block of reinforced concrete is as follows.

Wall 1 of the block is reinforced with a spatial frame in the form of double reinforcement with ring meshes: C-1, located in the median plane of the wall and C-2, located in the outer layer of concrete on the inside of the block wall. Reinforcement of the wall with mesh C-1 is made of composite wire reinforcement with annular spiral working reinforcement 2 with a turn step S along the height of the block. At the junction of the blocks, two rows of annular reinforcement 3 are laid and further along the height of the block in a spiral. The vertical reinforcement 4 of the annular mesh is installed in increments of S ₁ along the perimeter of the block. On the lower face of the wall, the vertical 4 reinforcement of the mesh is made with outlets S ₂ by a value of 3/4 of the radius of the key groove R for anchoring the upper block relative to the lower block in the glue joint 7. The reinforcement of the wall with the C-2 mesh is made of composite vertical reinforcement 5 and high-strength wire reinforcement 6. The outer surface of the wall of the block in the conditions of the factory technology after its stripping, puttying, grinding and priming has layers of crack-resistant paint and varnish coating, a layer (layers) of a decorative 8 paint coating and a layer of protective film material.

Concreting of blocks is performed in a vertical position with a vibration load to create an annular groove with a width equal to 1/3 of the wall thickness t ₁ .

The modular block of non-removable formwork of the prefabricated-monolithic pillar of the support of bridge structures has the advantage, in comparison with the prototype: increased strength and crack resistance of the wall of the blocks to the perception of transverse deformations of the concrete of the pillars of the precast-monolithic reinforced concrete supports of bridge structures.

An increase in the strength and crack resistance of the block wall is achieved due to the fact that the outer layer of concrete of the wall on the inside of the block has a transverse working reinforcement of high-strength reinforcement

Patent Search Literature

1. Balyuchik E.A., Shulman S.A., Shmidt V.I. Tkachenko S.S. Patent for invention: RU: No. 2107125 C1, IPC E01D 19/02. Application: No. 9611760203 dated September 3, 1996, publ. 03/20/1998.

2. Prefabricated monolithic supports. poznayka.org/s97704t1.html.

3. Patent for utility model No. 207719. Modular block of non-removable formwork of precast-monolithic reinforced concrete pillars of bridge structures / Ivanov G.P., Trofimov D.D. / Application No. 2021100286 dated January 11, 2021

Claims (1)

A modular block of non-removable formwork of a prefabricated monolithic reinforced concrete pillar of a support for bridge structures of a closed cross section, the wall of which in its middle plane is reinforced with a mesh of composite vertical and spiral reinforcement, while the outer surface of the wall has a protective paint and varnish and decorative coating, characterized in that the layer of concrete of the wall on the inside of the block it is reinforced with a mesh of composite vertical and spiral reinforcement.

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