Steam curing device for concrete inner and outer well walls of frozen shaft

Abstract

The invention discloses a steam curing device for concrete inner and outer well walls of a frozen shaft. The steam curing device for the concrete inner and outer well walls of the frozen shaft comprises a steam curing cylinder and a steam generator, wherein an airtight curing space is formed between the steam curing cylinder and the well walls, a steam conveyance pipe is mounted at a steam outlet of the steam generator, and the steam conveyance pipe is conducted with fluid in the airtight curing space through a seam airway. By adoption of the steam generator to generate steam, heat curing and humidification curing can be conducted to the concrete inner and outer well walls of the frozen shaft, and the temperature and the humidity of the concrete inner and outer well wall of the frozen shaft can be guaranteed; by adoption of an inflatable ring made of rubber, the airtightness between the curing device and the shaft well walls can be guaranteed; by arranging an inflatable nozzle connected with a compressed air piping line in the shaft on the inflatable ring, an inflatable pipe is not needed to be particularly connected so that resources can be saved; and by arranging a temperature and humidity sensor in the curing space, the temperature and the humidity in the curing space can be detected timely.

Description

technical field [0001] The invention relates to the technical field of mine underground engineering construction; more specifically, it relates to a device for steam curing the inner and outer walls of frozen shaft concrete. Background technique [0002] At present, no maintenance is done on the outer wall of the frozen shaft. Because the air temperature in the shaft is low during the excavation of the frozen shaft, the outer wall is directly exposed to the lower ambient temperature after demoulding, and the hydration heat loss of the shaft wall is relatively small. Fast, a large temperature gradient is easily formed inside the outer wall concrete, and under the action of temperature stress and gravity, the outer wall concrete is easy to develop and form circumferential cracks; the inner wall of the frozen shaft is relatively thick, especially the inner wall of the lower part of the large-diameter vertical shaft , with high strength grade and large thickness, it is a mass co...

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Problems solved by technology

[0002] At present, no maintenance is done on the outer wall of the frozen shaft. Because the air temperature in the shaft is low during the excavation of the frozen shaft, the outer wall is directly exposed to the lower ambient temperature after demoulding, and the hydration heat loss of the shaft wall is relatively small. Fast, a large temperature gradient is easily formed inside the outer wall concrete, and under the action of temperature stress and gravity, the outer wall concrete is easy to develop and form circumferential cracks; the inner wall of the frozen shaft is relatively thick, especially the inner wall of the lower part of the large-diameter vertical shaft , with high strength grade and large thickness, it is a mass concrete. After the inner wall concrete is poured, the heat of hydration is released in a large amount in a short time. Although many mines have adopted warm water for the maintenance of the inner wall, due to the large amount of spray water consumption, there are certain difficulties in the continuous supply of warm water, and it is quite difficult to control the water temperature, so that the phenomenon of direct flushing of the well wall with cold water often occurs. The artificially large temperature difference between the inner area and the surface of the inner wall concrete leads to many small temperature cracks on the inner wall surface, which affects the quality of the well wall; at present, the inner wall surface of the wellbore is cured with foam: the patent number is "2015103528875", and the patent name is "Frozen Shaft Concrete Inner Well Wall Foam Curing Device" can solve the problem of artificially forming a large temperature difference between the inner wall concrete area and the surface caused by direct flushing of the well wall with cold water, resulting in many small temperature cracks on the inner wall surface, but using The disadvantage of foam curing is that the curing device will move up and down in the shaft during the adjustment of the position of the demoulding plate. The bonding effect between the wire brush and the well wall is not good, and the sealing performance is not good, so that the foam liquid is consumed too much; and the foam needs to be finely configured to achieve a good maintenance effect, resulting in increased manpower and material costs.

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