Temperature-shrinkage, seam

 

The invention relates to the field of construction and can be used during the construction of building structures made of reinforced concrete. Temperature-shrinkage seam of the concrete element contains the longitudinal and transverse reinforcement in the form of a partition, installed the full width of the cross-section of the element. What's new is that the longitudinal reinforcement in the zone of the weld cross-section of the element is left continuous, and the partition is made in the form placed between the longitudinal reinforcement perpendicular to it sheet attached to it with one hand anchors. The technical result of the invention is to improve the quality and durability of constructed monolithic structures by increasing their fracture toughness. 2 C.p. f-crystals, 1 Il.

The invention relates to the field of construction and can be used during the construction of building structures made of reinforced concrete.

Known temperature-shrinkage seam made in the form of a cut in the cross section of the entire width of the element (B. S. Lukyanov, I. I. Denisov. "Protection of concrete bridge piers from thermal cracking". Transgenderist, M., 1959, S. 72).

The disadvantage of this seam - he cudnosti and the result achieved by the claimed is temperature-shrinkage seam, made in the form of a mortgage item, consisting of partitions for all thickness and width of the cross-section of the element (VP kamenetses, L. B. Moyzhes. Modern methods of concrete work in the construction of bridges. Transportation, M, 1972, S. 126).

This temperature and expansion joint has two drawbacks. First, it is designed for concrete elements. In reinforced concrete elements, the presence of reinforcement makes it almost impossible to install. Second, temperature-shrinkage crack may partially be formed with one hand laying element, and partly on the other, which considerably complicates its subsequent injectione.

The technical result of the invention is to improve the quality and durability of constructed monolithic structures by increasing their fracture toughness.

The essence of the invention lies in the fact that in the temperature-shrinkage joints of the concrete element containing the longitudinal and transverse reinforcement, made in the form of a partition, installed the full width of the cross-section of the element, the longitudinal reinforcement in the zone of the weld cross-section of the element is made continuous, and the partition is made in the form placed between prodelin regarde can be made in the form of profiled steel sheet attached to one side of the anchor. And in the area of the protective layer of the element can be installed partition, made in the form of slats of elastic material, such as plywood or rubber.

The invention is illustrated in the drawing, which presents a cross section of the concrete element with temperature-shrinkage seam.

Temperature and expansion joint in the concrete element 1 is made in the form of a partition 2, is installed on the entire width of the cross-section of the element 1. Partition 2 is a sheet attached to it with one hand anchors 3. The partition is placed between the longitudinal reinforcement 4 and installed perpendicular to it, without breaking its continuity.

In addition, the partition wall 2 can be made in the form of profiled steel sheet attached to it with one hand anchors 3. And within the protective layer of the element 1 with visible during the operation surface can be installed wall 6 made in the form of slats of elastic material, such as plywood or rubber. It is opposite walls 2 and is a continuation of it, but it is not connected.

Also within the protective layer 8 with invisible during operation the surface of the element 1 can be installed PE is ICA 6, set opposite the partition 2. The rail 6 is provided with handles 9 for subsequent removal after hardening of the concrete element 1.

Temperature-shrinkage seam corresponding to the present invention, operates as follows.

When the manifestation of shrinkage in concrete or cooling in the structure elements in the absence of the possibility of free movement occur tensile stress. If the voltage value reaches a large value, it can develop cracks. Before the formation of cracks in concrete occur microfractures, which reduces the durability of concrete. Cracks are formed in separate places, and microfractures in much larger areas. In this connection it is expedient to arrange the work element to microfractures and then a crack was formed in smaller areas. With this purpose, the elements create temperature and expansion joints.

These seams allow to localize microfractures, focusing all of deformation temperature and expansion joints. Thus the rest of the concrete is protected from micro destructions and cracks, while maintaining strength and durability of structures in General. This is the positive role of IP is bedstvie shrinkage of the concrete in this concrete element 1 tensile stresses arise. If the magnitude of these stresses reaches a critical value, the weakest section of the element 1 is formed crack. In this case the weakest (artificially low) cross-section is weld section dividers.

The presence on one side of the partition 2 attached to the anchors 3 prevents the propagation of cracks from this side. Therefore, the emerging crack will specifically localized and spread along the contour of the seam-partitions only on the side opposite that at which the fixed anchor.

In the future, after hardening of the concrete rail 6 can be extracted using the handles 9 and, if necessary, are injectiona cracks.

Claims

1. Temperature-shrinkage seam of the concrete element containing the longitudinal and transverse reinforcement, made in the form of a partition, installed the full width of the cross-section of the element, characterized in that the longitudinal reinforcement in the zone of the weld cross-section of the element is made continuous, and the partition is made in the form placed between the longitudinal reinforcement perpendicular to it sheet attached to it with one hand anchors.

is in p. 1, characterized in that in the area of the protective layer of the element is set to the partition, made in the form of slats of elastic material, such as plywood.

 

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SUBSTANCE: method involves filling gap between beams above sealing padding with cold mastic comprising at least two liquid dence oil products, namely products of propane oil residue deasphalting, bitumen, tar, mazut, gas-oil, lube fraction and naphtheno-aromatic hydrocarbons taken in amount of 48.0 - 80.0 % by weight, colloidal solution of acrylic acid ester copolymer with butadiene, styrene, acrylonitrile and/or vinylpyridine copolymer with butadiene and styrene and/or vinyl- and vinylidene chloride copolymer with butadiene and/or polyisoprene and/or butyl rubber and/or poly isobutylene and/or styrene and/or butadiene nitrile and/or polyvinylchloride and/or polyacrylamide and/or ethylenpropylene chlorosulphuretted polyethylene and/or carboxylated polymer and/or urethane polymer taken in amount of 10.0 - 26.0 % by weight, remainder - mineral component; hardening cold mastic; filling upper space between beams with hot mastic. Expansion joint includes sealing padding and cold mastic formed of material including at least two liquid dense oil products, namely products of propane oil residue deasphalting, bitumen, tar, mazut, gas-oil, lube fraction and naphtheno-aromatic hydrocarbons taken in amount of 48.0 - 80.0 % by weight, colloidal solution of acrylic acid ester copolymer with butadiene, styrene, acrylonitrile and/or vinylpyridine copolymer with butadiene and styrene and/or vinyl- and vinylidene chloride copolymer with butadiene and/or polyisoprene and/or butyl rubber and/or poly isobutylene and/or styrene and/or butadiene nitrile and/or polyvinylchloride and/or polyacrylamide and/or ethylenpropylene chlorosulphuretted polyethylene and/or carboxylated polymer and/or urethane polymer taken in amount of 10.0 - 26.0 % by weight remainder - mineral component.

EFFECT: increased service life of bridge passing.

3 cl, 4 dwg

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