阅读说明：本技术 一种钢结构表面硬化水泥浆及混凝土残留物清除方法 (Steel structure surface hardening cement paste and concrete residue removing method ) 是由 陈勇敢 单银木 尹卫泽 李鹏 胡立黎 应瑛 于 2019-09-05 设计创作，主要内容包括：本发明属于施工方法技术领域,公开了一种钢结构表面硬化水泥浆及混凝土残留物清除方法,包括以下步骤：将高压清洗机的水枪头以第一入射角度、第一间隔距离以及第一出水压力对所述钢结构表面进行冲洗,并清除所述硬化水泥浆区域；所述水枪头以第二入射角度、第二间隔距离以及第二出水压力对所述钢结构表面的残留物进行冲洗,并清除所述硬化混凝土区域。本发明的有益效果：不仅能确保钢结构表面防腐漆的完整性,节省后续补漆的耗费,而且相比于人工处理方式,其效率更高、效果更好,极大的节省了人工成本,显著地提升了后续钢结构界面层或防火层的施工质量,为装配式钢结构建筑的推广提供了有力支持。(The invention belongs to the technical field of construction methods, and discloses a method for removing hardened cement paste and concrete residues on the surface of a steel structure, which comprises the following steps: washing the surface of the steel structure by using a water gun head of a high-pressure cleaning machine at a first incident angle, a first interval distance and a first water outlet pressure, and removing the hardened cement paste area; and the water gun head washes residues on the surface of the steel structure at a second incident angle, a second spacing distance and a second water outlet pressure, and removes the hardened concrete area. The invention has the beneficial effects that: the integrity of the anticorrosive paint on the surface of the steel structure can be ensured, the consumption of subsequent paint repair is saved, the efficiency is higher and the effect is better compared with a manual treatment mode, the labor cost is greatly saved, the construction quality of a subsequent steel structure interface layer or a fire-proof layer is remarkably improved, and powerful support is provided for the popularization of the fabricated steel structure building.)

1. A steel structure surface hardened cement paste and a concrete residue removing method are provided, the steel structure surface is provided with an anti-corrosion paint, and a hardened cement paste area and a hardened concrete area are formed on the surface of the anti-corrosion paint, and the method is characterized by comprising the following steps:

Washing the surface of the steel structure by using a water gun head of a high-pressure cleaning machine at a first incident angle, a first interval distance and a first water outlet pressure, and removing the hardened cement paste area;

And the water gun head washes residues on the surface of the steel structure at a second incident angle, a second spacing distance and a second water outlet pressure, and removes the hardened concrete area.

2. The steel structure surface hardening cement paste and the concrete residue removing method according to claim 1, wherein the anti-corrosion paint comprises one or more of epoxy zinc-rich paint as a primer and epoxy micaceous iron paint, epoxy iron red paint, epoxy acrylic paint and polyurethane paint as an intermediate paint.

3. The steel structure case hardening cement slurry and the concrete residue removing method according to claim 2, wherein the first incident angle is in a range of 30 ° to 90 °.

4. The steel structure case hardening cement slurry and the concrete residue removing method according to claim 3, wherein the first distance is in a range of 100mm to 300 mm.

5. The steel structure case hardening cement slurry and the concrete residue removing method according to claim 4, wherein the first effluent pressure is in a range of 30MPa to 60 MPa.

6. The steel structure case hardening cement slurry and the concrete residue removing method according to claim 1, wherein the second incident angle range is between 70 ° and 80 °.

7. The steel structure case hardening cement slurry and the concrete residue removing method according to claim 6, wherein the second distance is in a range of 50mm to 100 mm.

8. The steel structure case hardening cement slurry and the concrete residue removing method according to claim 7, wherein the second effluent pressure is in a range of 50MPa to 60 MPa.

9. the method for removing hardened cement paste and concrete residues on the surface of a steel structure according to claim 8, wherein the relative movement speed of the water gun head of the high-pressure cleaning machine and the concrete residues during washing is 10-50 mm/s.

10. The method for removing hardened cement paste and concrete residues on the surface of a steel structure according to claim 1, wherein the water gun head is used for discharging water by rotating a single hole and washing the water in one or two modes of an S-shaped track from bottom to top or an M-shaped track from left to right.

Technical Field

The invention relates to the technical field of construction methods, in particular to a method for removing hardened cement paste and concrete residues on a steel structure surface.

Background

In the construction process of the fabricated steel structure building, the use of cement-based materials such as common concrete, self-compacting concrete and the like is also indispensable. When the concrete is poured or poured by pumping, the steel structure surface is more or less adhered with some splashed or overflowed cement paste or concrete residues. The adhesive force of the hardened cement paste and the surface of the steel structure with the anti-corrosion paint is low, the strength of hardened concrete residues is high, and the adhesive force of the hardened cement paste is higher than that of the surface of the steel structure with the anti-corrosion paint, if the hardened substances are left alone, the adhesive force of a subsequent interface layer or a fire-proof layer is reduced, and the hollow cracking is easily caused. However, the manual cleaning efficiency of the hardened cement paste or concrete residues on the surface of the steel structure is extremely low, and only 4m2 of wall surfaces can be cleaned by a single person per hour, so that the steel structure anti-corrosion paint is easily damaged, and the ideal cleaning effect cannot be achieved. Therefore, how to improve the removal efficiency of the hardened cement paste or concrete residues on the basis of not damaging the anticorrosive paint on the surface of the steel structure becomes an important problem influencing the construction efficiency of the steel structure assembly type building.

Disclosure of Invention

The invention aims to provide a steel structure surface hardening cement paste and a concrete residue removing method, which are used for solving the problems of low cleaning efficiency and poor effect of the existing steel structure surface hardening cement paste and concrete residue, ensuring the integrity of the steel structure surface anti-corrosion paint, greatly saving working hours and meeting the basic requirements of subsequent construction.

In order to achieve the purpose, the invention adopts the following technical scheme:

A steel structure surface hardened cement paste and a concrete residue removing method are provided, the steel structure surface is provided with an anti-corrosion paint, and a hardened cement paste area and a hardened concrete area are formed on the surface of the anti-corrosion paint, and the method comprises the following steps:

Washing the surface of the steel structure by using a water gun head of a high-pressure cleaning machine at a first incident angle, a first interval distance and a first water outlet pressure, and removing the hardened cement paste area;

And the water gun head washes residues on the surface of the steel structure at a second incident angle, a second spacing distance and a second water outlet pressure, and removes the hardened concrete area.

As a preferable scheme of the method for removing the hardened cement paste and the concrete residues on the surface of the steel structure, the anti-corrosion paint comprises epoxy zinc-rich paint serving as a primer and one or more of epoxy micaceous iron paint, epoxy iron red paint, epoxy acrylic paint and polyurethane paint serving as intermediate paint.

As a preferable embodiment of the above-mentioned method for removing hardened cement paste and concrete residues from the surface of a steel structure, the first incident angle is in a range of 30 ° to 90 °.

As a preferable mode of the method for removing hardened cement paste and concrete residues on the surface of the steel structure, the first spacing distance ranges from 100mm to 300 mm.

in a preferable embodiment of the method for removing hardened cement slurry and concrete residues from a surface of a steel structure, the first effluent pressure is in a range of 30MPa to 60 MPa.

As a preferable scheme of the method for removing the hardened cement paste and the concrete residues on the surface of the steel structure, the second incident angle range is between 70 and 80 degrees.

As a preferable mode of the method for removing the hardened cement paste and the concrete residues on the surface of the steel structure, the second spacing distance ranges from 50mm to 100 mm.

As a preferable mode of the method for removing the hardened cement paste and the concrete residues on the surface of the steel structure, the second effluent pressure is in a range of 50MPa to 60 MPa.

As a preferable scheme of the steel structure surface hardening cement paste and the concrete residue removing method, the relative moving speed of the water gun head and the concrete residue during flushing is 10-50 mm/s.

As a preferable scheme of the method for removing the hardened cement paste and the concrete residues on the surface of the steel structure, the water gun head adopts a single-hole rotating water outlet mode and washes the water in one or two modes of an S-shaped track from bottom to top or an M-shaped track from left to right.

The invention has the beneficial effects that: the integrity of the anticorrosive paint on the surface of the steel structure can be ensured, the consumption of subsequent paint repair is saved, the efficiency is higher and the effect is better compared with a manual treatment mode, the labor cost is greatly saved, the construction quality of a subsequent steel structure interface layer or a fire-proof layer is remarkably improved, and powerful support is provided for the popularization of the fabricated steel structure building.

Drawings

FIG. 1 is a steel structural composite according to an embodiment of the present invention;

Fig. 2 is a flow chart of the method for removing hardened cement paste and concrete residues from the surface of a steel structure according to the embodiment of the invention.

In the figure:

100-steel structure; 200-an anticorrosive paint layer; 300-mixed layer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

as in fig. 1, the bonding of cement paste and concrete in a steel structure is simulated: preparing a steel structure 100, spraying a plurality of anticorrosive paints on the first surface of the steel structure 100 in sequence after mechanical shot blasting and rust removal to form an anticorrosive paint layer 200, standing for at least one day, completely drying the former anticorrosive paint before spraying the latter anticorrosive paint, and then coating cement paste and concrete on the surface of the anticorrosive paint layer 200 to form a mixed layer 300, wherein the mixed layer 300 comprises a hardened cement paste area and a hardened concrete area.

in the present embodiment, the steel structure 100 has a planar structure, so that the anticorrosive paint layer 200 of uniform thickness is easily formed on the surface of the steel structure 100.

In the present embodiment, the thickness of the anti-corrosive paint layer 200 is not more than 200 μm.

The anticorrosion paint comprises epoxy zinc-rich paint as a primer, and two layers of epoxy mica iron paint as an intermediate paint are sprayed on the epoxy zinc-rich primer. It should be noted that the intermediate paint is not limited to one or more of epoxy iron oxide red paint, epoxy acrylic paint, and polyurethane paint.

Further, the thickness of the mixed layer 300 is not more than 1 mm.

it should be noted that the hardened cement paste area and the hardened concrete area have clear boundaries, no blending exists, and the coverage rate of the mixed layer 300 on the anti-corrosion paint layer 200 is more than 80%.

The following description will be made with reference to a flow chart of the steel structure case hardening cement paste and the concrete residue removing method shown in fig. 2.