Method for improving welding environment of 1000MPa-grade hydroelectric high-strength steel and welding cabin

Abstract

The invention discloses a welding environment improvement method for 1000MPa-level hydroelectric high-strength steel and a welding cabin. The method comprises the following steps that welding unit modularization is divided, independent welding cabins are formed, and improvement systems are installed, specifically, the improvement systems are arranged in all the independent welding cabins, and the improvement systems at least comprise the dehumidification step, the ventilation step and the temperature control step; through modular arrangement, under the conditions that automatic dehumidification and automatic continuous ventilation are formed in the independent welding cabin formed through modularization and the wind speed does not exceed the limit, the temperature is maintained, the optimal welding environment is guaranteed, the welding effect is guaranteed, and the environment is automatically monitored.

Description

Technical Field

[0001] This invention relates to the field of welding technology for 1000MPa grade steel, and in particular to a method for improving the welding environment of 1000MPa grade high-strength hydropower steel and a welding chamber. Background Technology

[0002] With the vigorous development of my country's hydropower construction, and based on the needs of high-altitude, cold-region, and high-head, large-capacity hydropower projects, the steel used in hydropower projects is also developing towards larger scale, higher strength, greener materials, and energy conservation. This places stricter requirements on the chemical composition, yield strength, tensile strength, low-temperature toughness, and weldability of high-strength steel plates. Domestic research and development of 1000MPa-grade high-strength steel has lagged behind, resulting in a reliance on imports for this grade of steel plates and related welding materials. However, imported products are expensive and have long delivery cycles, causing considerable difficulties for my country's hydropower equipment manufacturing enterprises. There is an urgent need to overcome the research and application challenges of 1000MPa-grade high-strength steel for hydropower.

[0003] In recent years, with the continuous development and progress of national science and technology, some domestic steel mills have successively and successfully developed 1000MPa-grade high-strength steel for hydropower, and carried out its first large-scale engineering application. Having achieved breakthroughs in the technology of 1000MPa-grade high-strength steel plates, matching welding materials, and welding processes, the installation and welding of this strength grade of pressure steel pipe inside tunnels presents another major challenge. The tunnels are windy and humid, with seepage in the surrounding rock, which is extremely unfavorable for welding ultra-high-strength steel. High wind speeds can easily lead to porosity in the weld, failure of temperature control during welding, and reduced mechanical properties of the weld; the humid environment easily causes the base material and welding materials to absorb moisture, introducing a large amount of diffusible hydrogen into the cladding metal, resulting in cold cracking defects; seepage in the surrounding rock directly prevents the commencement of welding work; welding fumes are abundant inside the tunnel, and the air quality is poor, harming the physical and mental health of welders.

[0004] Taking a real-world example of welding inside a tunnel, the welding environment inside the tunnel is harsh, windy, and humid, with humidity as high as 92% and wind speeds reaching 6 m / s. This can easily lead to a high content of diffusible hydrogen in the weld metal, increasing the tendency for cold cracking in the weld metal and the heat-affected zone. At the same time, the tunnel is filled with welding fumes and has turbid air, making the working environment unsuitable for welding operations. There is an urgent need to improve the construction environment inside the tunnel. Summary of the Invention

[0005] This invention provides a method for improving the welding environment of 1000MPa grade high-strength steel for hydropower and a welding chamber. It aims to solve the problems mentioned above, such as the harsh welding environment inside tunnels when welding 1000MPa grade steel, strong winds and high humidity, high wind speeds, which easily lead to high diffusible hydrogen content in the weld metal, increasing the tendency for cold cracking in the weld metal and the heat-affected zone. At the same time, the large amount of welding fumes and turbid air inside the tunnel make the working environment unsuitable for welding construction. Therefore, it is urgent to improve the construction environment inside the tunnel.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for improving the welding environment of 1000MPa grade high-strength steel for hydropower includes the following steps: Welding units are divided as follows: the lower curved section positioning section of the inclined shaft, the construction adit closure joint, and the steel branch pipe are used as reference points for division. At least the lower curved section positioning section, the construction adit closure joint, and the steel branch pipe are each treated as separate welding units. There is at least one welding unit between the lower curved section positioning section and the construction adit closure joint, and at least one welding unit between the construction adit closure joint and the steel branch pipe. Forming a welding chamber: Each welding unit is separated by a steel truss. The inner wall of the welding unit and the steel truss are covered with three-proof cloth to make each welding unit an independent welding chamber. Installation of improvement systems: An improvement system is installed in each individual welding chamber, which includes at least dehumidification, ventilation, and temperature control procedures; Dehumidification steps: Automatic dehumidification, controlling humidity to no more than 55%; Ventilation procedure: Automatic continuous ventilation, ensuring that the wind speed does not exceed 0.5m / s; Temperature control procedure: In conjunction with the ventilation procedure, the temperature shall not exceed 30°C while the wind speed does not exceed the limit.

[0007] Preferably, when dividing the welding units, the area between the underground curved positioning section and the closure joint of the construction adit is divided into several welding units, and the area between the closure joint of the construction adit and the steel branch pipe is divided into at least several welding units.

[0008] Preferably, when forming the welding chamber, the length of the welding chamber is an integer multiple of the length of the longitudinal flat steel along the tunnel direction, which facilitates the welding of the flat steel to the rock wall anchor rod along the tunnel direction to form the installation foundation for the three-proof cloth.

[0009] Preferably, the humidity is maintained at 50% to 55% during the dehumidification step.

[0010] Preferably, in the temperature control step, the temperature is maintained at 25°C to 30°C.

[0011] Preferably, the improved system further includes a fume removal step: a movable fume removal device moves synchronously with the welding position to eliminate welding fumes in real time.

[0012] A welding chamber for implementing the above-mentioned method for improving the welding environment of 1000MPa grade hydropower high-strength steel, comprising a tunnel section separated at both ends by steel trusses, a flat steel mesh frame provided along the tunnel wall by several support anchor rods, and three-proof cloths respectively fixedly laid on the flat steel mesh frame and the steel truss to form an independent chamber. The cabin is equipped with a dehumidification module, a ventilation module, an oxygenation module, a temperature module, and a controller. The dehumidification module is electrically connected to the controller to automatically maintain humidity, the ventilation module is electrically connected to the controller to automatically maintain airflow, the oxygenation module is electrically connected to the controller to automatically exchange air and maintain oxygen concentration, and the temperature module is electrically connected to the controller to automatically maintain temperature.

[0013] Preferably, the flat steel grid includes longitudinal flat steel arranged along the tunnel direction and transverse flat steel distributed circumferentially along the inner wall of the tunnel, and the ends of the flat steel are all welded and fixed to the corresponding support anchor rods and fixed to the inner wall surface in a grid pattern by the support anchor rods.

[0014] Preferably, the longitudinal flat steel bars are arranged at equal angles around the central axis of the tunnel, and the transverse flat steel bars are arranged at equal intervals along the central axis of the tunnel.

[0015] Preferably, the three-proof fabric is fixed to the steel truss or flat steel mesh frame by a number of nails.

[0016] Preferably, the dehumidification module includes a temperature and humidity sensor and a dehumidifier installed in the cabin. When the temperature and humidity sensor detects that the humidity exceeds the maximum value, the temperature and humidity sensor sends a signal to the controller, and the controller starts the dehumidifier or increases the power. When the temperature and humidity sensor detects that the humidity is below the minimum value, it sends a signal to the controller, which then shuts down the dehumidifier or reduces its power.

[0017] Preferably, the ventilation module includes a wind speed sensor, a blower, and a ventilation fan installed in the cabin. When the wind speed sensor detects that the wind speed exceeds a set value, the wind speed sensor sends a signal to the controller, and the controller reduces the power of the blower and the ventilation fan.

[0018] Preferably, the oxygenation module includes an oxygen concentration sensor and a blower installed in the cabin. When the oxygen concentration sensor detects that the oxygen concentration is lower than the minimum set value, the oxygen concentration sensor sends a signal to the controller, and the controller increases the power of the blower until the oxygen concentration exceeds the maximum set value and maintains the power.

[0019] Preferably, the wind speed when the oxygen concentration is within the set value range is less than the wind speed set by the ventilation module, so as to avoid conflict between the oxygenation module and the ventilation module and ensure that the wind speed never exceeds the set value of the ventilation module.

[0020] Preferably, the temperature module includes a temperature and humidity sensor, a blower, and a ventilation fan installed in the cabin. When the temperature and humidity sensor detects that the temperature exceeds the maximum value, the temperature and humidity sensor sends a signal to the controller, and the controller increases the power of the blower and the ventilation fan until the temperature is lower than the maximum value. When the temperature and humidity sensor detects that the temperature is below the minimum value, the sensor sends a signal to the controller, which then reduces the power of the blower and the ventilation fan until the temperature exceeds the minimum value.

[0021] Preferably, the wind speed when the temperature is within the set value range is less than the wind speed set by the ventilation module, so as to avoid conflict between the temperature module and the ventilation module and ensure that the wind speed never exceeds the set value of the ventilation module.

[0022] Preferably, the cabin is provided with an air inlet pipe that runs through the welding chamber in sequence, and the blower is connected to the air inlet pipe and communicates with the outside air through the air inlet pipe.

[0023] Preferably, the cabin is provided with an air outlet pipe that runs through the welding cabin in sequence, and the air exchanger is connected to the air outlet pipe and communicates with the outside through the air outlet pipe.

[0024] Preferably, the chamber is also equipped with a smoke removal module, which includes at least one movable fume purifier that can be manually moved synchronously with the welding position to eliminate welding fumes in real time.

[0025] The beneficial effects of this invention are: 1. The cavern is modularized into several welding units, and the welding units are arranged into independent welding chambers. The chambers are equipped with improvement systems including dehumidification, ventilation and temperature control, which greatly improves the welding construction environment, enhances the image of civilized construction, and ensures the welding quality of ultra-high strength steel. In the end, the first-pass qualification rate of the 1000MPa pressure steel pipe installation welding reached 100%, with excellent quality. 2. Add a smoke removal function. The smoke removal device can move with the welding to ensure the smoke removal effect, protect the safety of workers, and ensure the welding effect. 3. Automatic control is established to ensure that 1000MPa pressure steel pipes are welded in the optimal environment, avoiding problems such as high diffusible hydrogen content in the weld metal or increased cold cracking tendency of the weld metal and weld heat-affected zone. At the same time, the level of intelligence is improved, eliminating the need for manual control and enabling intelligent monitoring. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the welding unit arrangement of the present invention; Figure 2 This is a plan view of the steel truss of the present invention; Figure 3 This is a schematic diagram of the installation plan of the flat steel space frame of the present invention; Figure 4 This is a schematic plan view of the layout inside the welding chamber of the present invention; Figure 5 This is a schematic diagram of the dehumidification, oxygenation, ventilation, and temperature control processes of the present invention. In the diagram: 1. Steel truss; 2. Entrance door; 3. Three-proof cloth; 4. Nail; 5. Longitudinal flat steel; 6. Transverse flat steel; 7. Support anchor; 8. Temperature and humidity sensor; 9. Dehumidifier; 10. Wind speed sensor; 11. Air supply fan; 12. Air exchanger; 13. Oxygen concentration sensor; 14. Controller; 15. Smoke and dust purifier. Detailed Implementation

[0027] The embodiments will be further described below with reference to the accompanying drawings.

[0028] like Figures 1-5 As shown in the preferred embodiment 1, a method for improving the welding environment of 1000MPa-grade high-strength steel for hydropower includes the following steps: Welding units are divided as follows: the lower curved section positioning section of the inclined shaft, the construction adit closure joint, and the steel branch pipe are used as reference points for division. At least the lower curved section positioning section, the construction adit closure joint, and the steel branch pipe are each treated as separate welding units. There is at least one welding unit between the lower curved section positioning section and the construction adit closure joint, and at least one welding unit between the construction adit closure joint and the steel branch pipe. Forming a welding chamber: Each welding unit is separated by a steel truss 1. The inner wall of the welding unit and the steel truss 1 are covered with three-proof cloth 3 so that each welding unit forms an independent welding chamber. Installation of improvement systems: An improvement system is installed in each individual welding chamber, which includes at least dehumidification, ventilation, and temperature control procedures; Dehumidification steps: Automatic dehumidification, controlling humidity to no more than 55%; Ventilation procedure: Automatic continuous ventilation, ensuring that the wind speed does not exceed 0.5m / s; Temperature control procedure: In conjunction with the ventilation procedure, the temperature shall not exceed 30°C while the wind speed does not exceed the limit.

[0029] Preferably, when dividing the welding units, the area between the underground curved positioning section and the closure joint of the construction adit is divided into several welding units, and the area between the closure joint of the construction adit and the steel branch pipe is divided into at least several welding units.

[0030] Preferably, when forming the welding compartment, the length of the welding compartment is an integer multiple of the length of the longitudinal flat steel 5 along the tunnel direction, which facilitates the welding of the flat steel with the support anchor rod 7 on the tunnel wall along the tunnel direction to form the installation foundation of the three-proof cloth 3, and makes it easier to divide the welding units to form the welding compartment.

[0031] Preferably, the humidity is maintained at 50%~55% during the dehumidification step to ensure the welding effect.

[0032] Preferably, in the temperature control step, the temperature is maintained at 25℃~30℃ to ensure the welding effect.

[0033] Preferably, the improved system also includes a fume removal step: a movable fume purifier 15 moves synchronously with the welding position to eliminate welding fumes in real time.

[0034] like Figures 1-5 As shown, as a preferred embodiment 2, a welding cabin is used for the implementation of the above-mentioned method for improving the welding environment of 1000MPa grade hydropower high-strength steel. It includes a tunnel section separated at both ends by steel trusses 1. A flat steel mesh frame is provided along the tunnel wall by several support anchor rods 7. Three-proof cloth 3 is fixedly laid on the flat steel mesh frame and the steel truss 1 to form an independent cabin. The chamber is equipped with a dehumidification module, a ventilation module, an oxygenation module, a temperature module, and a controller 14. The dehumidification module is electrically connected to the controller 14 to automatically maintain humidity. The ventilation module is electrically connected to the controller 14 to automatically maintain wind speed. The oxygenation module is electrically connected to the controller 14 to automatically exchange air and maintain oxygen concentration. The temperature module is electrically connected to the controller 14 to automatically maintain temperature.

[0035] Preferably, the flat steel grid includes longitudinal flat steel 5 arranged along the tunnel direction and transverse flat steel 6 distributed circumferentially along the inner wall of the tunnel, and the ends of the flat steel are all welded and fixed to the corresponding support anchor rods 7 and fixed to the inner wall surface in a grid pattern through the support anchor rods 7.

[0036] Preferably, the longitudinal flat steel 5 is arranged at equal angles around the central axis of the tunnel, and the transverse flat steel 6 is arranged at equal intervals along the central axis of the tunnel.

[0037] Preferably, the three-proof fabric 3 is fixed to the steel truss 1 or flat steel mesh frame by a number of nails 4.

[0038] Preferably, both the front and rear steel trusses 1 are equipped with entry doors 2 for entering the cabin. The three-proof cloth 3 at the entry door 2 is installed in the form of a plastic curtain to facilitate entry and ensure a certain degree of isolation.

[0039] Preferably, the dehumidification module includes a temperature and humidity sensor 8 and a dehumidifier 9 installed in the cabin. When the temperature and humidity sensor 8 detects that the humidity exceeds the maximum value, the temperature and humidity sensor 8 sends a signal to the controller 14, and the controller 14 starts the dehumidifier 9 or increases the power. When the temperature and humidity sensor 8 detects that the humidity is below the minimum value, the temperature and humidity sensor 8 sends a signal to the controller 14, and the controller 14 turns off the dehumidifier 9 or reduces its power.

[0040] Preferably, the ventilation module includes a wind speed sensor 10, a blower 11, and a ventilation fan 12 installed in the cabin. When the wind speed sensor 10 detects that the wind speed exceeds the set value, the wind speed sensor 10 sends a signal to the controller 14, and the controller 14 reduces the power of the blower 11 and the ventilation fan 12.

[0041] Preferably, the oxygenation module includes an oxygen concentration sensor 13 and a blower 11 installed in the cabin. When the oxygen concentration sensor 13 detects that the oxygen concentration is lower than the minimum set value, the oxygen concentration sensor 13 sends a signal to the controller 14. The controller 14 increases the power of the blower 11 until the oxygen concentration exceeds the maximum set value and maintains the power.

[0042] Preferably, the wind speed when the oxygen concentration is within the set value range is less than the wind speed set by the ventilation module, so as to avoid conflict between the oxygenation module and the ventilation module and ensure that the wind speed never exceeds the set value of the ventilation module.

[0043] Preferably, the temperature module includes a temperature and humidity sensor 8, a blower 11, and a ventilation fan 12 installed in the cabin. When the temperature and humidity sensor 8 detects that the temperature exceeds the maximum value, the temperature and humidity sensor 8 sends a signal to the controller 14, and the controller 14 increases the power of the blower 11 and the ventilation fan 12 until the temperature is lower than the maximum value. When the temperature and humidity sensor 8 detects that the temperature is below the minimum value, the temperature and humidity sensor 8 sends a signal to the controller 14, and the controller 14 reduces the power of the blower 11 and the ventilation fan 12 until the temperature exceeds the minimum value.

[0044] Preferably, the wind speed when the temperature is within the set value range is less than the wind speed set by the ventilation module, so as to avoid conflict between the temperature module and the ventilation module and ensure that the wind speed never exceeds the set value of the ventilation module.

[0045] Preferably, the cabin is provided with an air inlet pipe that runs through the welding cabin in sequence, and the blower 11 is connected to the air inlet pipe and communicates with the external air through the air inlet pipe.

[0046] Preferably, the cabin is provided with an air outlet pipe that runs through the welding cabin in sequence, and the air exchanger 12 is connected to the air outlet pipe and communicates with the outside through the air outlet pipe.

[0047] Preferably, the chamber is also equipped with a smoke removal module, which includes at least one movable fume purifier 15 that can be moved synchronously with the welding position by a person to eliminate welding fumes in real time.

[0048] In a preferred embodiment 3, the dehumidification module and the temperature module share the same temperature and humidity sensor 8; The ventilation module, temperature module, and oxygenation module share the same air supply fan 11; The ventilation module and the temperature module share the same air exchanger 12.

[0049] like Figures 1-4 As shown, in a preferred embodiment 4, a practical example is used for illustration: Step 1: Partitioning.

[0050] Based on the distribution of 1000MPa pressure steel pipes in the tunnel and the actual installation conditions, the lower inclined shaft's bend section positioning section, the closure joint of construction adit #3, and the steel branch pipe are used as reference points for zoning, dividing the area into 5 unit zones, referred to as welding chambers. The lower inclined shaft's bend section positioning section marks the boundary between units 1 and 2. The closure area of ​​construction adit #3 must be a single unit. The upstream of construction adit #3 marks the boundary between units 2 and 3, and the downstream of construction adit #3 marks the boundary between units 3 and 4. The steel branch pipe is the fifth unit. The pressure steel pipe is 6m in length, and the zoning length is controlled according to the 6*N principle: unit 1 is 48m, unit 2 is 48m, unit 3 is 18m, unit 4 is 18m, and unit 5 is 12m.

[0051] Step Two: Initial Renovation.

[0052] I. Windproofing Measures: Each welding compartment is separated by a steel truss 1 + three-proof fabric 3 (fireproof + flame retardant + waterproof). The steel truss 1 is made of 50×4 square tubes welded together, with a horizontal spacing of 0.5m and a vertical spacing of 1m, and a 2m×1m access door 2 is reserved. The three-proof fabric 3 is fixed to the square tubes with nails 4.

[0053] II. Measures to prevent water seepage from the rock wall: Three-proof fabric 3 is laid around the rock wall, tightly attached to the tunnel wall. The fixed foundation is 4×40 flat steel bars, which are welded to the support anchor rods 7 to form the foundation. The longitudinal spacing of the flat steel bars along the tunnel direction is 1m, and the circumferential spacing of the flat steel bars is 1m. After the flat steel foundation is installed, the three-proof fabric 3 is fixed to the flat steel bars with nails 4.

[0054] Step 3: Interior Decoration I. Dehumidification Measures: Dehumidifiers will be installed. Calculations for welding chambers in units 9.1 and 2 show that the unit volume for a 48m long tunnel is 2091m³. 3 Considering a certain margin, we will configure 3 units with a circulating air volume of 1300m³ / h. 3A dehumidifier of 9 per hour can meet the actual needs. Calculations for the welding chambers of units 3 and 4 show that the volume of the 18m long tunnel unit is 784 m³. 3 Considering a certain margin, configure 2 units with a circulating air volume of 1300m³ / h. 3 A dehumidifier of 9 units per hour can meet actual needs. The calculation for the 5-unit welding chamber shows that the unit volume of a 12m long tunnel is 522m³. 3 Considering a certain margin, configure one unit with a circulating air volume of 1300m³ / h. 3 A dehumidifier with a capacity of 9 / h can meet actual needs.

[0055] II. Smoke Removal Measures: Six welders will be stationed inside the welding chamber during the welding of the circumferential seam. The welding will be done manually using welding rods, generating a large amount of welding fumes. Therefore, a fume purifier (15.1.2) will be installed. The calculation for the welding chambers of units 1 and 2 shows that the volume of the 48m long tunnel unit is 2091m³. 3 Configured with 2 units with a processing air volume of 1500m³ / h 3 A 15 / h fume purifier can meet actual needs. Calculations for welding chambers in units 3 and 4 show that the volume of a 18m long tunnel unit is 784m³. 3 Configured with one unit with an air volume of 1500m³ 3 A 15 / h fume purifier can meet actual needs. Based on the calculation of a 5-unit welding chamber, the unit volume of a 12m long tunnel is 522m³. 3 Configured with one unit with an air volume of 1500m³ 3 The 15-meter-per-hour smoke and dust purifier can meet actual needs.

[0056] III. Ventilation. The welding chamber is a closed space and requires a ventilation fan (11) to ensure good air quality. Calculations for welding chambers 1 and 2 show that the volume of the 48m long tunnel unit is 2091m³. 3 Configured with 2 units of air supply capacity 3200m³ / h 3 The 11 blowers per hour can meet the actual needs. Calculations for welding chambers in units 3 and 4 show that the volume of a 18m long tunnel unit is 784m³. 3 Configured with one unit with an air supply volume of 3200m³ 3 The 11 blowers per hour can meet the actual needs. The calculation for the 5-unit welding chamber shows that the unit volume of a 12m long tunnel is 522m³. 3 Configured with one unit with an air supply volume of 3200m³ 3 The blower 11, with a capacity of / h, can meet the actual needs. The blower 11 is installed at both ends of the welding chamber, and an anemometer is installed at the welding position to monitor the wind speed.

[0057] During actual construction, the optimal coordination point was achieved by adjusting the power of the dehumidifier 9, the dust purifier 15, and the blower 11. The temperature inside the welding chamber was maintained at 25℃~30℃, the humidity at 50%-55%, and the wind speed ≤0.5m / s, meeting the high-quality construction environment standards for 1000MPa high-strength steel welding. This ensured the high-quality welding of the 1000MPa high-strength steel, laying a solid foundation for the subsequent large-scale application of high-strength steel and providing technical solutions for the development and construction of large-scale hydropower projects in China.

Claims

1. A method for improving the welding environment of 1000MPa grade high-strength steel for hydropower, characterized in that, Includes the following steps: Welding units are divided as follows: the lower curved section positioning section of the inclined shaft, the construction adit closure joint, and the steel branch pipe are used as reference points for division. At least the lower curved section positioning section, the construction adit closure joint, and the steel branch pipe are each treated as separate welding units. There is at least one welding unit between the lower curved section positioning section and the construction adit closure joint, and at least one welding unit between the construction adit closure joint and the steel branch pipe. Forming a welding chamber: Each welding unit is separated by a steel truss. The inner wall of the welding unit and the steel truss are covered with three-proof cloth to make each welding unit an independent welding chamber. Installation of improvement systems: An improvement system is installed in each individual welding chamber, which includes at least dehumidification, ventilation, and temperature control procedures; Dehumidification steps: Automatic dehumidification, controlling humidity to no more than 55%; Ventilation procedure: Automatic continuous ventilation, ensuring that the wind speed does not exceed 0.5m / s; Temperature control procedure: In conjunction with the ventilation procedure, the temperature shall not exceed 30°C while the wind speed does not exceed the limit.

2. The method for improving the welding environment of 1000MPa-grade high-strength steel for hydropower as described in claim 1, characterized in that, When dividing the welding units, the area between the underground curved positioning section and the closure joint of the construction adit is divided into several welding units, and the area between the closure joint of the construction adit and the steel branch pipe is divided into at least several welding units.

3. The method for improving the welding environment of 1000MPa grade high-strength steel for hydropower as described in claim 1 or 2, characterized in that, When forming the welding chamber, the length of the welding chamber is an integer multiple of the length of the longitudinal flat steel along the tunnel direction, which facilitates the welding of the flat steel to the rock wall anchor rod along the tunnel direction to form the installation foundation for the three-proof cloth.

4. The method for improving the welding environment of 1000MPa-grade high-strength steel for hydropower as described in claim 1, characterized in that, During the dehumidification step, the humidity is maintained at 50%~55%.

5. The method for improving the welding environment of 1000MPa-grade high-strength steel for hydropower as described in claim 1, characterized in that, During the temperature control step, the temperature is maintained at 25℃~30℃.

6. The method for improving the welding environment of 1000MPa grade high-strength steel for hydropower as described in claim 1, characterized in that, The improved system also includes a fume removal step: a movable fume removal device moves synchronously with the welding position to eliminate welding fumes in real time.

7. A welding chamber, characterized in that, The method for improving the welding environment of 1000MPa grade hydropower high-strength steel as described in any one of claims 1 to 6 includes a tunnel section separated at both ends by steel trusses, a flat steel mesh frame is provided along the tunnel wall by several support anchor rods, and three-proof cloth is fixedly laid on the flat steel mesh frame and the steel truss to form an independent compartment. The cabin is equipped with a dehumidification module, a ventilation module, an oxygenation module, a temperature module, and a controller. The dehumidification module is electrically connected to the controller to automatically maintain humidity, the ventilation module is electrically connected to the controller to automatically maintain airflow, the oxygenation module is electrically connected to the controller to automatically exchange air and maintain oxygen concentration, and the temperature module is electrically connected to the controller to automatically maintain temperature.

8. A welding chamber according to claim 7, characterized in that, The flat steel grid includes longitudinal flat steel arranged along the tunnel direction and transverse flat steel distributed circumferentially along the inner wall of the tunnel. The ends of the flat steel are all welded and fixed to the corresponding support anchor rods and fixed to the inner wall surface in a grid pattern through the support anchor rods.

9. A welding chamber according to claim 8, characterized in that, The longitudinal flat steel bars are arranged at equal angles around the central axis of the tunnel, and the transverse flat steel bars are arranged at equal intervals along the central axis of the tunnel.

10. A welding chamber according to claim 7, characterized in that, The three-proof fabrics are all fixed to the steel truss or flat steel mesh frame by a number of nails.

11. A welding chamber according to claim 7, characterized in that, The dehumidification module includes a temperature and humidity sensor and a dehumidifier installed in the cabin. When the temperature and humidity sensor detects that the humidity exceeds the maximum value, the temperature and humidity sensor sends a signal to the controller, and the controller starts the dehumidifier or increases the power. When the temperature and humidity sensor detects that the humidity is below the minimum value, it sends a signal to the controller, which then shuts down the dehumidifier or reduces its power.

12. A welding chamber according to claim 7, characterized in that, The ventilation module includes a wind speed sensor, a blower, and a ventilation fan installed in the cabin. When the wind speed sensor detects that the wind speed exceeds the set value, the wind speed sensor sends a signal to the controller, and the controller reduces the power of the blower and the ventilation fan.

13. A welding chamber according to claim 7, characterized in that, The oxygenation module includes an oxygen concentration sensor and a blower installed in the cabin. When the oxygen concentration sensor detects that the oxygen concentration is lower than the minimum set value, the oxygen concentration sensor sends a signal to the controller, and the controller increases the power of the blower until the oxygen concentration exceeds the maximum set value and maintains the power.

14. A welding chamber according to claim 13, characterized in that, When the oxygen concentration is within the set range, the wind speed is always lower than the wind speed set by the ventilation module, thus avoiding conflict between the oxygenation module and the ventilation module and ensuring that the wind speed never exceeds the set value of the ventilation module.

15. A welding chamber according to claim 7, characterized in that, The temperature module includes a temperature and humidity sensor, a blower, and a ventilation fan installed in the cabin. When the temperature and humidity sensor detects that the temperature exceeds the maximum value, the temperature and humidity sensor sends a signal to the controller, and the controller increases the power of the blower and the ventilation fan until the temperature is lower than the maximum value. When the temperature and humidity sensor detects that the temperature is below the minimum value, the sensor sends a signal to the controller, which then reduces the power of the blower and the ventilation fan until the temperature exceeds the minimum value.

16. A welding chamber according to claim 15, characterized in that, When the temperature is within the set value range, the wind speed is always less than the wind speed set by the ventilation module to avoid conflict between the temperature module and the ventilation module, and to ensure that the wind speed never exceeds the set value of the ventilation module.

17. A welding chamber according to any one of claims 12 to 16, characterized in that, The cabin is equipped with an air inlet pipe that runs through the welding chamber in sequence. The blower is connected to the air inlet pipe and communicates with the outside air through the air inlet pipe.

18. A welding chamber according to any one of claims 12 to 16, characterized in that, The cabin is equipped with an air outlet pipe that runs through the welding chamber in sequence. The air exchanger is connected to the air outlet pipe and communicates with the outside world through the air outlet pipe.

19. A welding chamber according to claim 7, characterized in that, The cabin is also equipped with a smoke removal module, which includes at least one movable fume purifier that can be moved synchronously with the welding position by a person to eliminate welding fumes in real time.

20. A welding chamber according to claim 7, characterized in that, Both the front and rear steel trusses are equipped with access doors for entering the cabin, and the three-proof cloth at the access door is installed in the form of a plastic curtain.

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