CN107675813A - A kind of construction method of winter masonry project - Google Patents

Abstract

The present invention relates to a kind of construction method of winter masonry project, comprise the following steps：S1, the dirt for removing building material surface, reject the fragment of brick freezed by immersion；If S2, lime paste freeze, melt lime paste；S3, mix well sand and it is not contained diameter and freeze block and ice cube more than 10mm；S4, in advance heating sand are to 20~35 DEG C, and for heating water to 40~70 DEG C, environment temperature is not less than 5 DEG C of mixing mortars, and mixing time increases by 0.5~1 times than normal temperature situation；S5, build masonry by laying bricks or stones, vertical mortar seam is filled up before daily knock off, does not spread mortar above, masonry upper surface is covered with insulation material.Compared with prior art, the present invention is in mortar by adding proper proportion antifreezing agent, modified foaming agent, improves the performances such as the freeze-proof of mortar, workability, durability, and the effective measure for ensureing masonry quality is proposed in work progress.

Description

A construction method of masonry works in winter

technical field

The invention relates to a masonry construction method, in particular to a winter masonry construction method.

Background technique

In winter in northern my country and cold regions, due to long-term continuous low temperature, large temperature difference, strong wind, snowfall and freezing, the climate conditions are poor. When the average outdoor temperature is expected to be lower than 5°C for 10 consecutive days, or outside the winter construction period, when the daily temperature is lower than 3°C, the masonry work shall be carried out in accordance with winter construction requirements.

The most significant effect in winter is that the mortar is frozen by the low temperature. The frozen mortar will stop hardening, lose its cementation and strength, significantly reduce the plasticity, weaken the density of mortar joints, and produce uneven settlement under the upper load after the mortar is thawed. Therefore, the winter construction of masonry works needs to take corresponding measures from various aspects.

Contents of the invention

Purpose of the present invention is exactly to provide a kind of construction method of winter masonry project in order to overcome the defective that above-mentioned prior art exists.

The purpose of the present invention can be achieved through the following technical solutions:

A construction method for masonry works in winter, comprising the following steps:

S1. Remove the dirt on the surface of the masonry material and remove the bricks frozen due to water immersion;

S2, if the lime paste freezes, then melt the lime paste;

S3, mix the sand thoroughly so that it does not contain frozen blocks and ice cubes with a diameter greater than 10mm;

S4. Preheat the sand to 20-35°C, heat the water to 40-70°C, and mix the mortar at an ambient temperature not lower than 5°C. The mixing time is 0.5-1 times longer than that at normal temperature;

S5. To build masonry, fill up the vertical mortar joints before the daily work ends, do not spread mortar on the top, and cover the upper surface of the masonry with thermal insulation materials.

The mortar includes sand, water, cement, lime paste and antifreeze.

The proportion of the antifreeze in the mortar is 6-7%.

The mortar also includes a modified microfoam agent, and its proportion in the mortar is 0.1-0.3%.

The mortar has a consistency of 90-120mm when used in porous brick masonry, and 45-60mm when used in rubble masonry.

The mortar is directly transported after mixing, without accumulation for secondary transportation, and the storage time of the mortar does not exceed 15 minutes.

The temperature of the mortar is above 5°C when laying masonry.

Compared with the prior art, appropriate antifreeze agent is added to the mortar of the present invention to prevent the mortar from hardening, and an appropriate amount of modified microfoam is added, thereby improving the workability, freeze-thaw cycle resistance and durability of the mortar, and saving The amount of cement; the water and sand are preheated, and the mixing time is 0.5 to 1 times longer than that at normal temperature, which is conducive to the uniformity of the mortar. The water temperature is 40 to 70 ° C and will not cause false coagulation due to excessive temperature; construction Do a good job of insulating the masonry at the end of each day to ensure that the masonry will not suffer from low-temperature freezing and cracking.

Description of drawings

Fig. 1 is the construction method of winter masonry project of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

As shown in Figure 1, a construction method for masonry works in winter includes the following steps:

S1. Remove dirt, ice and snow on the surface of masonry materials, and remove bricks frozen due to water immersion;

S2, if the lime paste freezes, then melt the lime paste;

S3. Mix the sand thoroughly so that it does not contain frozen blocks and ice blocks with a diameter greater than 10mm, so as to ensure the quality of the mortar;

S4. Pre-heat the sand to 20-35°C, heat the water to 40-70°C, and mix the mortar at an ambient temperature of not lower than 5°C. The mixer can be used to set up a scaffolding and a stove to keep it warm. The mixing time is 0.5-1 times longer than that at normal temperature. The sand field is covered with tents, and when the temperature is low, a greenhouse is used to keep the sand from freezing, but the sand must not burn on the steel plate;

S5. To build masonry, fill up the vertical mortar joints before closing the work every day, do not spread mortar on the top, and cover the upper surface of the masonry with thermal insulation materials. The snow can be swept away before the masonry can continue.

The mortar includes sand, water, cement, lime paste and antifreeze, wherein the proportion of antifreeze in the mortar is 6-7%. The mortar also includes a modified microfoam agent, whose proportion in the mortar is 0.1-0.3%, which can improve the workability, freeze-thaw cycle resistance and durability of the mortar, and can save the amount of cement.

The consistency of mortar is 90-120mm when it is used in porous brick masonry, and the consistency is 45-60mm when it is used in rubble masonry.

The mortar is directly transported after mixing, without accumulation for secondary transportation, and the storage time of the mortar shall not exceed 15 minutes.

After the mortar has been stirred and transported, the temperature of the masonry is above 5°C. Do not use frozen mortar, do not mix hot water into the frozen mortar for re-stirring, and do not add water to the mortar during masonry. Under the condition of negative temperature, do not spray water and wet when laying bricks.

Claims (7)

1. A construction method for masonry works in winter, characterized in that it may further comprise the steps: S1. Remove the dirt on the surface of the masonry material and remove the bricks frozen due to water immersion; S2, if the lime paste freezes, then melt the lime paste; S3, mix the sand thoroughly so that it does not contain frozen blocks and ice cubes with a diameter greater than 10mm; S4. Preheat the sand to 20-35°C, heat the water to 40-70°C, and mix the mortar at an ambient temperature not lower than 5°C. The mixing time is 0.5-1 times longer than that at normal temperature; S5. To build masonry, fill up the vertical mortar joints before the daily work ends, do not spread mortar on the top, and cover the upper surface of the masonry with thermal insulation materials. 2. The construction method of a kind of masonry project in winter according to claim 1, wherein the mortar comprises sand, water, cement, lime paste and antifreeze. 3. The construction method of a kind of winter masonry project according to claim 2, characterized in that, the ratio of the antifreeze agent in the mortar is 6-7%. 4 . The construction method of a masonry project in winter according to claim 2 , wherein the mortar further comprises a modified microfoam agent, and its proportion in the mortar is 0.1-0.3%. 5. The construction method of a kind of masonry project in winter according to claim 1, wherein the mortar has a consistency of 90-120mm when used in porous brick masonry, and a consistency of 90mm when used in rubble masonry. In 45 ~ 60mm. 6. The construction method of a kind of masonry project in winter according to claim 1, characterized in that, the mortar is directly transported after mixing without being stored for secondary transportation, and the storage time of the mortar is no more than 15 minutes. 7. The construction method of a masonry project in winter according to claim 1, characterized in that the temperature of the mortar is above 5°C when the masonry is being built.