CN114472116B - Winter welding and coating construction method for steel truss girder and multi-type support - Google Patents
Winter welding and coating construction method for steel truss girder and multi-type support Download PDFInfo
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- CN114472116B CN114472116B CN202111551265.7A CN202111551265A CN114472116B CN 114472116 B CN114472116 B CN 114472116B CN 202111551265 A CN202111551265 A CN 202111551265A CN 114472116 B CN114472116 B CN 114472116B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2504/00—Epoxy polymers
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Abstract
The invention relates to a winter welding and coating construction method for a steel truss girder and a multi-type support, which comprises the steps of firstly welding the steel truss girder and a support short column, then welding the support short column and a fixed hinged support, and then welding the support short column and a unidirectional sliding hinged support; after the welding is finished, the epoxy diluent is added into the oily paint to prepare the welding seam paint, and the construction of the welding seam paint is carried out at the welding seam. The method of the invention processes the construction process, and has simple symmetrical welding operation, strong applicability and good welding effect. The welding seam paint is reasonably prepared, the mixing ratio of the epoxy diluent in the welding seam paint is adjusted according to the ambient temperature, the construction performance of the welding seam paint can be greatly adjusted, the same brushing performance of the welding seam paint used in different environments is ensured, and the construction quality is ensured.
Description
Technical Field
The invention belongs to the technical field of building construction, in particular relates to welding construction of a steel truss girder and a support in winter construction, and particularly relates to a winter welding and coating construction method of the steel truss girder and a multi-support.
Background
The steel has the characteristics of high strength, light dead weight, good overall rigidity and strong deformability, and is particularly suitable for constructing large-span and ultra-high and ultra-heavy buildings; the material has good homogeneity and isotropy, belongs to an ideal elastomer, and is most in line with the basic assumption of general engineering mechanics; the material has good plasticity and toughness, can deform greatly, and can bear dynamic load well; short construction period, high industrialization degree and high mechanization degree of specialized production.
As a green environment-friendly product, the steel structure has the advantages of light dead weight, high strength, good earthquake resistance and the like compared with the traditional concrete structure. The method is suitable for structures with small total load proportion of live load points, and is more suitable for large-span space structures, high-rise structures and construction on soft soil foundations. The method also accords with national policies of environmental protection, saving and intensive utilization of resources, and the comprehensive economic benefit is more and more accepted by investors of all parties, and objectively promotes designers and developers to select steel structures.
In winter construction, because of low field environmental temperature, higher requirements are placed on welding between the steel truss girder and the polytype support. In the welding construction process of the steel truss girder and the multi-type support, high-altitude welding operation is more, truss splicing welding lines are more concentrated, the welding lines are more, the welding lines are thick, and in addition, the temperature is low in winter, the temperature difference is large, so that uneven deformation of the welding lines is easily caused. Therefore, for the special condition that the temperature is low in winter, new welding technology and coating materials are urgently needed to solve the problems.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a winter welding and coating construction method for a steel truss girder and a multi-type support.
The invention is realized by the following technical scheme:
a winter welding and coating construction method for a steel truss girder and a multi-type support comprises the following steps:
1) Welding of steel truss girder and support
(1) Welding steel truss girder and support short column
The steel truss girder is transported to a construction site, welding is firstly carried out on the steel truss girder and the support short column, and hoisting operation is carried out after the welding is completed;
Firstly welding and fixing a first welding line and a second welding line which are in a vertical direction with the main structure at the hinged support, wherein the welding direction is outwards welded from the end of the main structure, two persons simultaneously weld in multiple layers and multiple channels at two sides, the welding directions of the welding lines at each channel are the same, and the welding lines at two sides simultaneously start and simultaneously end;
after the two welding seams are finished, the rest third welding seam and the fourth welding seam are welded, if the welding seams are outside beams, the welding seams are welded from outside to inside, and the welding seams at the two sides are simultaneously started and ended; if the welding line is an inner side beam (steel beams are arranged on two sides), the welding line does not need to be in a specified direction, the two sides are welded in the same direction, and welding lines on the two sides start and end simultaneously;
(3) welding the support short column and the unidirectional sliding hinge support
After the fixed hinged support is welded, starting to weld the unidirectional sliding hinged support; firstly welding a fifth welding line and a sixth welding line which are in a vertical direction with the main structure at the position of the unidirectional sliding hinged support, wherein the welding direction is outwards welded from the end of the main structure, two persons simultaneously weld in multiple layers and multiple channels at two sides, the welding directions of the welding lines at each channel are the same, and the welding lines at two sides simultaneously start and simultaneously end;
after the two welding seams are finished, welding the rest seventh welding seam and the eighth welding seam, if the welding seams are outside beams, welding the welding seams from outside to inside, and performing multi-layer multi-pass welding, wherein the welding seams at the two sides start and finish simultaneously; if the welding line is an inner side beam (steel beams are arranged on two sides), the welding line does not need to be in a specified direction, the two sides are welded in the same direction, and welding lines on the two sides start and end simultaneously;
2) Coating construction at weld joint
(1) Configuration of epoxy diluents
The epoxy diluent is prepared from petroleum xylene: cyclohexanone: butanol=7: 1:2 (mass ratio) preparing, namely adding an epoxy diluent into the oily paint to prepare a welding seam paint;
(2) cleaning up the weld joint part before brushing;
(3) polishing and sand blasting, wherein the base material exposes the surface of the original steel material, has no greasy dirt, rust or oxide layer;
(4) the welding seam paint is fully stirred, the color and luster are kept uniform, and the working viscosity and consistency of the welding seam paint ensure that the paint does not flow down and brush lines are not displayed during the coating process;
(5) when the first layer of welding seam paint is painted, the painting direction is painted along the welding seam from top to bottom, and the painting direction is connected with the original paint surface for 100mm in width, and the painting is neat;
(6) and after the first-time welding seam coating is dried, brushing a second-time welding seam coating, wherein the brushing direction of the second-time welding seam coating is perpendicular to the brushing direction of the first-time welding seam coating, and brushing is sequentially carried out, so that the thickness of a paint film is uniform and consistent.
Further, in step (1) of step 2), when the ambient temperature is higher than 0 ℃, the mass ratio of the epoxy diluent in the weld coating is 20%; when the ambient temperature is lower than 0 ℃ and higher than-5 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 25%; when the ambient temperature is lower than-5 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 30%.
Further, after the step 2), the surface of the steel structure is cleaned before the coating, and the steel structure is covered in the presence of strong wind or rain and snow weather within 4 hours after the coating, so that dust and moisture are prevented from adhering to the steel structure, the adhesive force of the coating is affected, the coating color after the coating is consistent, and no wrinkled skin or pimple is generated.
Compared with the prior art, the invention has the following beneficial effects:
the method of the invention processes the construction process, ensures that the temperature difference is overlarge due to low ambient temperature when the support is welded, and the deformation is different, so that the structural stability of the steel structure is damaged, the symmetrical welding operation is simple, the applicability is strong, and the welding effect is good. The welding seam paint is reasonably prepared, the mixing ratio of the epoxy diluent in the welding seam paint is adjusted according to the ambient temperature, the construction performance of the welding seam paint can be greatly adjusted, the same brushing performance of the welding seam paint used in different environments is ensured, and the construction quality is ensured. The method can ensure the welding quality of the steel structure, improve the brushing performance of the paint, greatly accelerate the construction progress, and is safe, reliable, economical and reasonable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic diagram of the connection of a steel truss girder to a polytype support.
Fig. 2 is a top view of fig. 1.
In the figure: 1-steel truss girder, 2-support short column, 3-fixed hinged support, 4-unidirectional sliding hinged support, 5-main structure, 6-first weld, 7-second weld, 8-third weld, 9-fourth weld, 10-fifth weld, 11-sixth weld, 12-seventh weld and 13-eighth weld.
Detailed Description
For a better understanding of the present invention, reference will be made to the following description of the invention taken in conjunction with the accompanying drawings and examples. In addition, features in the embodiments and examples of the present application may be combined with each other without conflict.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
A winter welding and coating construction method for a steel truss girder and a multi-type support comprises the following steps:
1) Welding of steel truss girder 1 and support
(1) Welding the steel truss girder 1 and the support short column 2
The steel truss girder 1 is transported to a construction site, welding is firstly carried out on the steel truss girder 1 and the support short column 2, and hoisting operation is carried out after the welding is completed;
As shown in fig. 1 and 2, a first welding seam 6 and a second welding seam 7 which are in a vertical direction with a main body structure 5 at the hinged support 3 are welded and fixed, the welding direction is outwards welded from the end of the main body structure 5, two people weld at two sides in multiple layers, the welding direction of each welding seam is the same, and the welding seams at two sides start and finish simultaneously;
after the two welding seams are finished, the left third welding seam 8 and the left fourth welding seam 9 are welded, if the welding seams are outside beams, the welding seams are welded from outside to inside, and the multi-layer multi-channel welding is performed, and the welding seams at the two sides start and end simultaneously; if the welding line is an inner side beam (steel beams are arranged on two sides), the welding line does not need to be in a specified direction, the two sides are welded in the same direction, and welding lines on the two sides start and end simultaneously;
(3) welding the support short column 2 and the unidirectional sliding hinge support 4
As shown in fig. 1 and 2, the fixed hinge support 3 is welded, and the welding of the unidirectional sliding hinge support 4 is started; firstly, welding a fifth welding line 10 and a sixth welding line 11 which are in a vertical direction with the main body structure 5 at the position of the unidirectional sliding hinged support 4, wherein the welding direction outwards welds from the end of the main body structure 5, two people simultaneously weld in multiple layers at two sides, the welding directions of all the welding lines are the same, and the welding lines at two sides simultaneously start and end;
after the two welding seams are finished, the rest seventh welding seam 12 and the eighth welding seam 13 are welded, if the welding seams are outside beams, the welding seams are welded from outside to inside, and the multi-layer multi-channel welding is performed, and the welding seams at the two sides are simultaneously started and simultaneously ended; if the welding line is an inner side beam (steel beams are arranged on two sides), the welding line does not need to be in a specified direction, the two sides are welded in the same direction, and welding lines on the two sides start and end simultaneously;
2) Coating construction at weld joint
(1) Configuration of epoxy diluents
The epoxy diluent is prepared from petroleum xylene: cyclohexanone: butanol=7: 1:2 (mass ratio) preparing, namely adding an epoxy diluent into the oily paint to prepare a welding seam paint;
when the ambient temperature is higher than 0 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 20%; when the ambient temperature is lower than 0 ℃ and higher than-5 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 25%; when the ambient temperature is lower than-5 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 30%;
(2) cleaning up the weld joint part before brushing;
(3) polishing and sand blasting, wherein the base material exposes the surface of the original steel material, has no greasy dirt, rust or oxide layer;
(4) the welding seam paint is fully stirred, the color and luster are kept uniform, and the working viscosity and consistency of the welding seam paint ensure that the paint does not flow down and brush lines are not displayed during the coating process;
(5) when the first layer of welding seam paint is painted, the painting direction is painted along the welding seam from top to bottom, and the painting direction is connected with the original paint surface for 100mm in width, and the painting is neat;
(6) and after the first-time welding seam coating is dried, brushing a second-time welding seam coating, wherein the brushing direction of the second-time welding seam coating is perpendicular to the brushing direction of the first-time welding seam coating, and brushing is sequentially carried out, so that the thickness of a paint film is uniform and consistent.
3) Fireproof coating
Cleaning the surface of the steel structure before coating, and covering the steel structure after coating in the presence of strong wind or rain and snow weather within 4 hours to prevent dust and moisture from adhering and affecting the adhesive force of the coating, wherein the coated steel structure has consistent coating color and no crinkles and pimples.
The scope of the present invention is not limited to the above embodiments, but various modifications and alterations of the present invention will become apparent to those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (2)
1. A winter welding and coating construction method for a steel truss girder and a multi-type support is characterized in that:
1) Welding of steel truss girder and support
(1) Welding steel truss girder and support short column
The steel truss girder is transported to a construction site, welding is firstly carried out on the steel truss girder and the support short column, and hoisting operation is carried out after the welding is completed;
(2) welding the short column of the support and the fixed hinge support
Firstly welding and fixing a first welding line and a second welding line which are in a vertical direction with the main structure at the hinged support, wherein the welding direction is outwards welded from the end of the main structure, two persons simultaneously weld in multiple layers and multiple channels at two sides, the welding directions of the welding lines at each channel are the same, and the welding lines at two sides simultaneously start and simultaneously end;
after the two welding seams are finished, the rest third welding seam and the fourth welding seam are welded, if the welding seams are outside beams, the welding seams are welded from outside to inside, and the welding seams at the two sides are simultaneously started and ended; if the welding head is an inner side beam, the welding head does not need to be in a specified direction, two sides are welded in the same direction, and welding seams at two sides start and end simultaneously;
(3) welding the support short column and the unidirectional sliding hinge support
After the fixed hinged support is welded, starting to weld the unidirectional sliding hinged support; firstly welding a fifth welding line and a sixth welding line which are in a vertical direction with the main structure at the position of the unidirectional sliding hinged support, wherein the welding direction is outwards welded from the end of the main structure, two persons simultaneously weld in multiple layers and multiple channels at two sides, the welding directions of the welding lines at each channel are the same, and the welding lines at two sides simultaneously start and simultaneously end;
after the two welding seams are finished, welding the rest seventh welding seam and the eighth welding seam, if the welding seams are outside beams, welding the welding seams from outside to inside, and performing multi-layer multi-pass welding, wherein the welding seams at the two sides start and finish simultaneously; if the welding head is an inner side beam, the welding head does not need to be in a specified direction, two sides are welded in the same direction, and welding seams at two sides start and end simultaneously;
2) Coating construction at weld joint
(1) Configuration of epoxy diluents
The epoxy diluent is petroleum xylene according to the mass ratio: cyclohexanone: butanol=7: 1:2, adding an epoxy diluent into the oily paint to prepare a welding seam paint; when the ambient temperature is higher than 0 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 20%; when the ambient temperature is lower than 0 ℃ and higher than-5 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 25%; when the ambient temperature is lower than-5 ℃, the mass ratio of the epoxy diluent in the welding seam coating is 30%;
(2) cleaning up the weld joint part before brushing;
(3) polishing and sand blasting, wherein the base material exposes the surface of the original steel material, has no greasy dirt, rust or oxide layer;
(4) the welding seam paint is fully stirred, the color and luster are kept uniform, and the working viscosity and consistency of the welding seam paint ensure that the paint does not flow down and brush lines are not displayed during the coating process;
(5) when the first layer of welding seam paint is painted, the painting direction is painted along the welding seam from top to bottom, and the painting direction is connected with the original paint surface for 100mm in width, and the painting is neat;
(6) and after the first-time welding seam coating is dried, brushing a second-time welding seam coating, wherein the brushing direction of the second-time welding seam coating is perpendicular to the brushing direction of the first-time welding seam coating, and brushing is sequentially carried out, so that the thickness of a paint film is uniform and consistent.
2. The winter welding and coating construction method for the steel truss girder and the polytype support according to claim 1, wherein the method comprises the following steps: after the step 2), fireproof coating is carried out, the surface of the steel structure is cleaned before coating, and after coating, the steel structure is covered when strong wind or rain and snow weather is met within 4 hours, so that dust and moisture are prevented from being adhered and dyed, the adhesive force of a coating is affected, the coating color after coating is consistent, and no wrinkled skin and pimple are generated.
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| CN105904063A (en) * | 2016-05-25 | 2016-08-31 | 中建钢构武汉有限公司 | Forged steel piece welding method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105904063A (en) * | 2016-05-25 | 2016-08-31 | 中建钢构武汉有限公司 | Forged steel piece welding method |
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