Construction method for spraying polymer mortar aiming at structural strengthening

Abstract

The invention discloses a construction method for spraying polymer mortar aiming at structural strengthening. The construction method comprises the following steps: 1. cleaning the surface needing structural strengthening, and constructing steel wire meshes or steel bar meshes; 2. spraying interfacial agent onto the base surface needing structural strengthening by a bomb-spraying gun; 3. connecting a mortar sprayer with an air compressor, and spraying the polymer mortar onto the base surface by the compressed air; 4. spraying the polymer mortar layer by layer, wherein, the steel wire meshes or the steel bar meshes need to be substantially covered in a first layer, and the following layer is to be sprayed until the polymer mortar in the first layer is initially set; and carrying out the sub-region line production at the interval of the initial setting time; and 5. leveling the surface of the mortar layer by using a ruler until the sprayed mortar reaches the design thickness, and further floating and finishing by a trowel dipped in water. The invention has the advantages that the thickness of the mortar layer reaches 10cm, the formation is dense, and the polymer mortar is securely bonded with the base layer, the steel wires and the steel bars; and the invention avoids the problems easily caused by manual operations, concerning the quality of the mortar layer, such as, hollowness, layering, segregation, dropping off, non-uniform thickness and the like.

Description

technical field [0001] The invention discloses a building construction method, which is especially suitable for the construction of a polymer mortar layer in a structure enlarged section method. Background technique [0002] In the reinforcement technology of enlarged section method, the construction method of formwork grouting was usually used in the past. The formwork grouting method needs to build a formwork construction link, which has a long construction period and high formwork cost; the enlarged surface layer is usually relatively thin and the steel bars are dense, which requires high construction performance of the grouting material, so the material price is also high, and the forming quality is not easy to control. The use of steel strand mesh (reinforced mesh)-polymer mortar reinforcement technology does not require support formwork, the construction speed is fast, and the construction performance requirements of materials are not high. It is a new type of reinforc...

AI Technical Summary

Problems solved by technology

There are many defects in manual plastering: when the thickness of the reinforced mortar layer is required to be more than 6cm, it is difficult to achieve compaction by manual plastering; artificial factors can easily lead to fluctuations in construction quality, and the thickness of the mortar layer is uneven; the plastering force is not easy to control, too large It is easy to cause segregation on the surface of the mortar, and if the force is too small, it is easy to separate; manual plastering is also easy to cause workers to mix materials on the working surface, which not only causes random changes in material ratios, but also easily causes ground pollution and waste of materials; The existence of wire mesh and steel mesh also brings difficulties to manual operation, and it is easy to form hollows behind the steel bars

The polymer mortar used for the structure is different from ordinary cement mortar or putty. It has the characteristics of high consistency, high viscosity, high wet density, high sand content, and large sand particles. difficult to apply