SU1442600A1 - Method of erecting a concrete dam - Google Patents

Abstract

The invention relates to the field of hydraulic engineering. The purpose of the invention is to reduce the construction time and increase the reliability of the dam erected from low-cement concretes. The dam consists of a non-pressure unit 1 and a pressure unit 2. In summer, the base is prepared and concrete is laid over the entire width of the dam. In winter, low-cement concrete is laid in a non-pressure block 1 in layers, with or without compaction, with freezing of each layer. In the summer, low-cement concrete is placed in the pressure unit 2 in layers with compaction. In subsequent years, the operation is repeated. Putting the dam under pressure, begin to freeze block 1, the concrete of which will gradually gain strength. 1 hp f-ly, 1 ill. (WITH

Description

4 ;: 4 GO

but

This invention relates to the erection of concrete dams erected primarily in the northern building-climate zone.

The purpose of the invention is to reduce the construction time and increase the reliability of the dam, which can be made of low-cement concrete.

The drawing shows a dam, cross section.

The dam consists of a non-pressure unit 1 and a pressure unit 2.

The method is carried out as follows.

In the summer, the base is prepared by known methods, a layer of concrete is laid over the entire width of the dam in order to create high-quality mating of the dam body with a base; in winter, low-cement concrete is laid in a non-pressure block 1 in layers with or without compaction with freezing of each layer (like a primer). In the summer of low-cement concrete is placed in the pressure unit 2 in layers with a seal. In the second winter, low-cement concrete is placed in a non-pressure unit 1 with freezing, and in the summer in a pressure unit 2. In the third year, the operations are repeated. In this way, a dam is erected, in which the non-pressure concrete block 1 will be a frozen block of concrete mix, in which the ice serves as an ice mate. So, the frozen dam was built, it was put under pressure.

During operation, the frozen concrete mixture of the non-pressure unit 1 thaws from the upstream side due to conductive heat transfer from the reservoir through the pressure unit 2, as well as through convective heat transfer from the leaked water. Thawing concrete mix leads to the process of cement hydration, which causes the growth of concrete strength. At the same time, in the process of cement hydration, heat is released, which contributes to further advance of the thawing front into the frozen-in frozen concrete mass. Sledova5

By controlling the heat input from the reservoir, it is possible to control the process of defrosting the frozen concrete mix and its hardening.

The control of the temperature state of the dam in the automatic mode can be ensured, for example, by arranging zones of waterproof concrete in the pressure unit 2, and the intensity of filling the reservoir. Dam reliability also

provide by lining non-flank face of the dam, for example, with prefabricated concrete blocks with installation of anchors to a depth exceeding the depth of seasonal thawing of the concrete mix.

The contact of the pressure block 2 with the strength determined by the strength of the cement stone with the non-pressure block 1 of the frozen concrete mix is essentially ground. If this joint is structurally formed in the form of a soil layer and an ice-ground curtain is installed in it, prerequisites arise for the manual control of the defrosting process of the non-pressure block 1. Turning off the freezing system in the design mode, ensure the design speed of concrete hardening with close connection with the processes of self-compacting the concrete .

Claims (2)

Invention Formula . A method of erecting a concrete dam, which includes layering the concrete and making longitudinal grooves, characterized in that, in order to reduce construction time and increase the reliability of the dam erected from low-cement concrete, in the summer period, the foundation is concrete, then the non-pressure part of the dam, separated by a longitudinal expansion joint, the pressure part of the dam being erected in the summer, and the non-pressure part in the winter time with the freezing of each layer, with 0 the seam filled with plastic scarlet. 2. A method according to Claim 1, characterized in that after the construction of the dam, the frozen out non-pressure part of the dam is thawed. five