Steel structural member pre-positioning connection method based on heat treatment

Abstract

The invention relates to a steel structure component pre-positioning connection method based on heat treatment. The method comprises the following steps that S10, components are designed; s20, carrying out inner wall shielding treatment; s30, preheating treatment is conducted; s40, formal heating treatment is carried out; s50, carrying out heat preservation treatment; s60, hoisting and inserting; s70, welding treatment is conducted; s80, slow cooling is conducted; by adopting the principle of thermal expansion and cold contraction, after the inner diameter of the groove of the socket end is expanded through heating, the protrusion of the insertion end is inserted into the groove, finally, the inner diameter of the groove is reduced after cooling is completed, the groove and the protrusion are in close fit, and compared with a traditional connecting plate bolt connecting mode, the connecting precision and strength of a steel structure component are remarkably improved; compared with a traditional connecting plate welding mode, cutting-off work does not need to be carried out in the later period of construction, damage to a steel structure component is avoided, and the problems of thermal stress and deformation caused by temperature difference can be effectively solved through preheating treatment and slow cooling.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure installation, and in particular relates to a method for pre-positioning and connecting steel structure components based on heat treatment. Background Art

[0002] During the aerial splicing of steel structure components, pre-positioning connection is required before the formal welding connection. At present, the pre-positioning connection of steel structures usually adopts the method of connecting plate bolt connection or connecting plate welding. The connecting plate bolt connection method is easy to loosen, the connection of steel structure components is not tight enough, and the connection accuracy and strength are low. The connecting plate welding method also requires the connecting plate to be cut off in the later stage of construction. In the process of cutting off the connecting plate, it is inevitable that the steel structure components will be damaged. In order to avoid the above problems, a new pre-positioning connection method for steel structure components needs to be designed. Summary of the invention

[0003] The main purpose of the present invention is to propose a method for pre-positioning and connecting steel structural members based on heat treatment, which can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A method for pre-positioning and connecting steel structural members based on heat treatment, comprising the following steps:

[0006] S10. Component design: redesign the two steel structure components to be connected, one end of one steel structure component has a groove, which serves as a socket end, and one end of the other steel structure component has a protrusion, which serves as an insertion end;

[0007] S20, inner wall shielding treatment: shielding treatment is performed on the inner wall of the groove;

[0008] S30, preheating treatment: using heating equipment to uniformly preheat the socket end;

[0009] S40, formal heating treatment: after the preheating treatment is completed, the heating equipment starts formal heating treatment on the socket end, and the inner diameter of the groove of the socket end expands after heating;

[0010] S50, heat preservation treatment: after reaching the required heating temperature, the heating device automatically performs heat preservation treatment;

[0011] S60, hoisting and inserting: hoist another steel structure member to the designated position, and insert its protrusion into the groove after heat expansion;

[0012] S70, welding process: welding operation is performed at the joint of two components, and the temperature after heating and heat preservation in step S40 and step S50 is used as preheating treatment before welding;

[0013] S80, slow cooling: slowly cool the socket end and weld, and control the cooling speed;

[0014] Preferably, in step S10, the groove matches the protrusion, and both the groove and the protrusion are circular.

[0015] Preferably, in step S20, the inner wall shielding treatment is performed by coating the inner wall of the socket end with a foam agent having fast dissipation and heat insulation effects.

[0016] Preferably, in step S30, the preheating treatment uses an electric heating device to uniformly preheat the socket end, and the preheating temperature is controlled at 150° C. for 30 minutes.

[0017] Preferably, in step S40, when the socket end is subjected to formal heating treatment using a heating device, the heating temperature is controlled at 450°C and the duration is 20 minutes.

[0018] Preferably, in step S50, the insulation treatment temperature is maintained at 450° C. for a duration of 10 minutes.

[0019] Preferably, between step S10 and step S20, the method further includes:

[0020] S11. Surface cleaning: remove impurities such as oil, rust and oxide scale on the surface of components to ensure a clean surface.

[0021] Preferably, after step S80, the method further includes:

[0022] S90, tempering treatment: after cooling is completed, the component is tempered.

[0023] Preferably, after step S90, the method further includes:

[0024] S100, Dimension inspection: Check the dimensions of the components to ensure that the dimensions of the connected components meet the design requirements;

[0025] S110, Appearance inspection: Carry out appearance inspection on components to ensure that there are no defects such as cracks and deformation on the surface;

[0026] S120, Mechanical properties test: Conduct mechanical properties test on components to ensure that the connected components have sufficient strength and toughness;

[0027] S130, Quality Records: Record the entire construction process to ensure that each step has detailed quality records to facilitate subsequent traceability and inspection.

[0028] The present invention provides a method for pre-positioning and connecting steel structure components based on heat treatment, which has the following beneficial effects:

[0029] The present invention adopts the principle of thermal expansion and contraction. After the inner diameter of the groove of the socket end is expanded by heating, the protrusion of the insertion end is inserted into the groove. Finally, after cooling, the inner diameter of the groove is reduced, and the groove and the protrusion are tightly matched. Compared with the traditional connecting plate bolt connection method, the connection accuracy and strength of the steel structure components are significantly improved. Compared with the traditional connecting plate welding method, no cutting work is required in the later stage of construction, which avoids damage to the steel structure components. In addition, the thermal stress and deformation problems caused by temperature difference can be effectively reduced through preheating treatment and slow cooling. The components are not easy to deform during the heating process, which ensures the stability and structural integrity of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the steel structure component of the present invention;

[0031] Figure 2 It is a schematic diagram of the splicing of the steel structure components of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0033] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example

[0037] Reference Figure 1-2 , a method for pre-positioning and connecting steel structural members based on heat treatment, comprising the following steps:

[0038] S10. Component design: redesign two steel structure components to be connected, one end of one steel structure component has a groove 1, and this end serves as a socket end, and one end of the other steel structure component has a protrusion 2, and this end serves as an insertion end;

[0039] Preferably, the groove 1 is matched with the protrusion 2, and both the groove 1 and the protrusion 2 are circular;

[0040] S20, inner wall shielding treatment: shielding treatment is performed on the inner wall of the groove 1;

[0041] The inner wall is shielded with high-temperature heat-resistant materials to ensure that the temperature of the inner wall is evenly controlled during the subsequent heating process to avoid deformation or cracks caused by excessive heating of the inner wall.

[0042] Preferably, a foam agent with fast dissipation and heat insulation effect is used to coat the inner wall of the socket end. The use of a naturally dissipating foam agent can reduce the impact on subsequent construction procedures and achieve heat insulation without affecting the accuracy of positioning and connection.

[0043] S30, preheating treatment: using heating equipment to uniformly preheat the socket end;

[0044] Preheating can reduce thermal stress caused by temperature difference, reduce temperature difference before formal heating, and prevent deformation and crack formation of components caused by temperature difference.

[0045] Preferably, an electric heating device is used to uniformly preheat the socket end, the preheating temperature is controlled at 150° C., and the duration is 30 minutes;

[0046] Of course, the heating method is not limited to electric heating technology and high-frequency induction heating, and other heating methods such as infrared heating can also be used.

[0047] S40, formal heating treatment: after the preheating treatment is completed, the heating equipment starts formal heating treatment on the socket end, and the inner diameter of the groove 1 of the socket end expands after heating;

[0048] Formal heating treatment requires continuous temperature monitoring to ensure uniform heating and reaching the predetermined temperature;

[0049] Preferably, when the socket end is subjected to formal heating treatment using a heating device, the heating temperature is controlled at 450° C. and the duration is 20 minutes.

[0050] S50, heat preservation treatment: after reaching the required heating temperature, the heating device automatically performs heat preservation treatment;

[0051] Insulation treatment reduces thermal stress problems caused by sudden temperature drops by maintaining a stable heating temperature, significantly improving the structural stability and service life of the components.

[0052] Preferably, the insulation temperature of the insulation treatment is maintained at 450° C. and the duration is 10 minutes.

[0053] S60, hoisting and inserting: hoist another steel structure member to a designated position, and insert its protrusion 2 into the groove 1 after heat expansion;

[0054] During the lifting and insertion process, ensure that the components are aligned and inserted smoothly to avoid damage or deviation;

[0055] S70, welding process: welding operation is performed at the joint of two components. The welding operation uses the temperature after heating and heat preservation in step S40 and step S50 as preheating treatment before welding, thereby reducing the preheating steps originally required for welding.

[0056] S80, slow cooling: slowly cooling the socket end and the weld 3, and controlling the cooling speed;

[0057] Slow cooling can reduce thermal stress and deformation, and prevent weld cracking and stress concentration caused by rapid cooling. If necessary, segmented cooling or step cooling can be used to further reduce thermal stress. After cooling, the inner diameter of the groove 1 is reduced, and the groove 1 and the protrusion 2 are closely matched.

[0058] Preferably, the cooling rate is 2°C / min.

[0059] The present invention adopts the principle of thermal expansion and contraction. After the inner diameter of the groove of the socket end is expanded by heating, the protrusion of the insertion end is inserted into the groove. Finally, after cooling, the inner diameter of the groove is reduced, and the groove and the protrusion are tightly matched. Compared with the traditional connecting plate bolt connection method, the connection accuracy and strength of the steel structure components are significantly improved. Compared with the traditional connecting plate welding method, no cutting work is required in the later stage of construction, which avoids damage to the steel structure components. In addition, the thermal stress and deformation problems caused by temperature difference can be effectively reduced through preheating treatment and slow cooling. The components are not easy to deform during the heating process, which ensures the stability and structural integrity of the connection.

[0060] In a specific embodiment, between step S10 and step S20, the

[0061] S11. Surface cleaning: remove impurities such as oil, rust and oxide scale on the surface of components to ensure the surface is clean;

[0062] Surface cleaning can avoid local uneven heating and contamination caused by surface contamination during the heating process, thereby ensuring the effectiveness of the heating treatment.

[0063] Preferably, sandblasting, degreasing or chemical solvents can be used in combination with ultrasonic cleaning technology to effectively remove various impurities on the surface of the component, and then high-pressure water washing and hot air drying can be used to ensure that the surface of the component is thoroughly clean and dry.

[0064] In a specific embodiment, after step S80, the following steps are also included

[0065] S90, tempering treatment: after cooling is completed, the component is tempered;

[0066] The purpose of tempering treatment is to eliminate residual stress and stabilize the microstructure and size of the component. The tempering temperature and time need to be adjusted according to the specific component material and use requirements to ensure the best effect;

[0067] Preferably, for common steel structural members, the tempering temperature is controlled at 300° C. and the duration is 2 hours.

[0068] In a specific embodiment, after step S90, the following steps are also included

[0069] S100, Dimension inspection: Check the dimensions of components to ensure that the dimensions of the connected components meet the design requirements.

[0070] In a specific embodiment, after step S90, the following steps are also included

[0071] S110, Appearance inspection: Carry out appearance inspection on components to ensure that there are no defects such as cracks and deformation on the surface;

[0072] In a specific embodiment, after step S90, the following steps are also included

[0073] S120, Mechanical properties test: Conduct mechanical properties test on components to ensure that the connected components have sufficient strength and toughness.

[0074] In a specific embodiment, after step S90, the following steps are also included

[0075] S130, Quality Records: Record the entire construction process to ensure that each step has detailed quality records to facilitate subsequent traceability and inspection.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for pre-positioning and connecting steel structural members based on heat treatment, characterized in that: The following steps are involved: S10. Component design: redesign the two steel structure components to be connected, one end of one steel structure component has a groove, which serves as a socket end, and one end of the other steel structure component has a protrusion, which serves as an insertion end; S20, inner wall shielding treatment: shielding treatment is performed on the inner wall of the groove; S30, preheating treatment: using heating equipment to uniformly preheat the socket end; S40, formal heating treatment: after the preheating treatment is completed, the heating equipment starts formal heating treatment on the socket end, and the inner diameter of the groove of the socket end expands after heating; S50, heat preservation treatment: after reaching the required heating temperature, the heating device automatically performs heat preservation treatment; S60, hoisting and inserting: hoisting another steel structure member to a designated position, and inserting its protrusion into the groove after heat expansion; S70, welding treatment: welding operation is performed at the joint of the two members, and the temperature after heating and heat preservation in step S40 and step S50 is used as preheating treatment before welding; S80, slow cooling: Slowly cool the socket end and weld and control the cooling speed.

2. A method for pre-positioning and connecting steel structural members based on heat treatment according to claim 1, characterized in that: In step S10, the groove is matched with the protrusion, and both the groove and the protrusion are circular.

3. The method for pre-positioning and connecting steel structural members based on heat treatment according to claim 1, characterized in that: In step S20, the inner wall shielding treatment is performed by coating the inner wall of the socket end with a foam agent having fast dissipation and heat insulation effects.

4. The method for pre-positioning and connecting steel structural members based on heat treatment according to claim 1, characterized in that: In step S30, the preheating treatment uses an electric heating device to uniformly preheat the socket end, and the preheating temperature is controlled at 150° C. for 30 minutes.

5. The method for pre-positioning and connecting steel structural members based on heat treatment according to claim 1, characterized in that: In step S40, when the socket end is formally heated using a heating device, the heating temperature is controlled at 450°C and the duration is 20 minutes.

6. The method for pre-positioning and connecting steel structural members based on heat treatment according to claim 1, characterized in that: In step S50, the insulation treatment temperature is maintained at 450° C. for 10 minutes.

7. The method for pre-positioning and connecting steel structural members based on heat treatment according to claim 1, characterized in that: Also included between step S10 and step S20 S11. Surface cleaning: remove impurities such as oil, rust and oxide scale on the surface of components to ensure a clean surface.

8. The method for pre-positioning and connecting steel structural members based on heat treatment according to claim 1, characterized in that: After step S80, the following steps are also included S90, tempering treatment: after cooling is completed, the component is tempered.

9. A method for pre-positioning and connecting steel structural members based on heat treatment according to claim 8, characterized in that: After step S90, the following steps are also included S100, Dimension inspection: Check the dimensions of the components to ensure that the dimensions of the connected components meet the design requirements; S110, Appearance inspection: Carry out appearance inspection on components to ensure that there are no defects such as cracks and deformation on the surface; S120, Mechanical properties test: Conduct mechanical properties test on components to ensure that the connected components have sufficient strength and toughness; S130, Quality Records: Record the entire construction process to ensure that each step has detailed quality records to facilitate subsequent traceability and inspection.

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