SU1756489A1 - Butt joint of sectional reinforced-concrete members - Google Patents

Abstract

The invention relates to the construction, in particular to the structures of the joints of reinforced concrete piles, columns, arches and other structures with non-stressed reinforcement. Essence a butt joint of precast concrete elements 1 and 2 contains embedded parts in the form of boxes 4 and 5, to which reinforcing bars 3 are welded in pairs and removed from the contact surface of the joined elements by the size of the base layer of reinforced concrete and joined together by means of a bolt b, nuts and lock nuts . 3 il.

Description

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The invention relates to the construction, in particular to the structures of the joints of precast concrete elements of piles, columns and other structures of buildings and structures with non-reinforced reinforcement.

A butt joint of precast reinforced concrete elements with longitudinal reinforcing bars is known, which includes attachments attached to the ends of the latter in the form of boxes, open in the direction of outwardly external elements, having a bottom with an opening in the direction of the joint for fasteners. The weakening of the concrete section of the joining elements and a large number of embedded parts.

The purpose of the invention is to increase the bearing capacity of the joint by providing equal strength of reinforced concrete elements and the joint.

Docking of various precast concrete elements along the full concrete surface, minus only the bolt holes, ensures full use of the bearing capacity of the structure and reduction of the metal intensity of the joint

The goal is achieved by the fact that the reinforcing bars are attached to the embedded parts in pairs, and the embedded parts are placed from the end of the abutting elements by an amount equal to the size of the base layer of the reinforced concrete element. FIG. 1 shows a butt joint of precast reinforced concrete elements, FIG. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The butt joint of precast concrete elements 1 and 2, reinforced with longitudinal non-stressed reinforcing bars 3, includes inserts 4 and 5 and a fastening element connecting them, for example in the form of a bolt 6 with washers 7, a nut 8 and a lock nut 9

The longitudinal reinforcement bars 3 are pairwise attached, for example, by welding to the side edges of embedded parts 4 and 5 in the form of boxes open to the outer surface 10 of precast concrete elements 1 and 2. The form of embedded parts 4 and 5 may be semicircular 11, triangular 12, rectangular 13, trapezoidal 14, and so on. The bottom 15 of the inserts 4 and 5, facing the joint, has an opening 16, the diameter of which is larger than the diameter of the bolt 6. The second bottom 17 of the inserts 4 and 5 is blank between the joined surfaces 18 prefabricated reinforced concrete members 1 and 2 and mortgage

Parts 4 and 5 contain supporting layers of reinforced concrete 19 reinforced with transverse reinforcement 20, through which concrete channels (holes) 21 are conducted, the diameter of which is equal to the diameter of hole 16 in the bottom

of embedded parts 4 and 5 The length of embedded parts 4 on one side of the joint is not less than the length of the bolt 6, and the length of the embedded part 5 on the other side of the joint is not less than the thickness of the nut 8 with the lock nut 9.

Precast concrete elements 1 and 2 are made separately in formwork with rigid ends, the holes in which correspond to the location of the holes in the embedded parts 4 and 5 Embedded parts 4

and 5 with the reinforcing rods 3 welded to them in advance, are fed into the formwork and bolted with a channel former for the face shields, the internal cavity of the fixtures 4 and 5 is closed from ingress of the solution, for example, with rubber inserts, after which the element is concreted

On mounting abutting surfaces of precast concrete elements 1 and 2

covered with glue or mortar, align the holes 16 and 21, insert the bolt 6 into the hole 16 of the embedded part 4 and into the hole 21, tighten the nut 8 and the lock nut 9 with the necessary force, and the cavities

embedded parts 4 and 5 are filled with mortar or bitumen.

Claims (1)

Claims of the Invention Joint connection of precast concrete elements with longitudinal reinforcing bars, including attached to the ends of the backfill their embedded parts in the form of boxes, open toward the outer surface of the joined elements having a bottom with a hole directed towards the joint for fasteners, characterized in that, in order to increase the bearing capacity of the joint by ensuring equal strength reinforced concrete elements and the joint, reinforcing bars are attached to the embedded parts in pairs, and embedded parts are placed from the end of the joined elements by an amount equal to the size of the base layer reinforced concrete element Aa FIG. 2 Compiled by Y. Borisov Tehred M. Morgental Figz Proofreader A.Dolinich Editor O. Golovach Order 3069 Circulation: Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, U. Gagarin, 101 Figz Proofreader A.Dolinich