Automatic construction process for mounting pressure steel pipe in straight section hole

Abstract

The invention provides an automatic construction process for mounting a pressure steel pipe in a straight section hole, belongs to the technical field of construction processes, and solves the technical problems of low construction efficiency and low safety. An automatic construction technology for installing a pressure steel pipe in a straight section hole comprises the following steps that firstly, two sets of embedded holes are dug in the unloading position in the hole, concrete is poured into the holes, the distance is determined according to the size of the steel pipe, and two sets of overhead anchors are taken out and fixed to the concrete; 2, the site is cleaned, sundries and obstacles in the site are removed, it is ensured that the site is flat and firm, the operation requirement is met, and the vehicle parking position and the hoisting operation area are reasonably planned according to the storage position of the steel pipe and the operation radius of a crane. According to the invention, automatic construction in the hole is realized, the personnel investment is reduced, the construction efficiency is improved, cameras and alarms are arranged on site, monitoring is carried out, alarm reminding is carried out, the installation safety is ensured, and the installation accuracy is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction technology, and relates to an automated construction process for installing a pressure steel pipe, in particular to an automated construction process for installing a pressure steel pipe in a straight section tunnel. Background Art

[0002] A pumped-storage hydropower station utilizes electricity generated during low-load periods to pump water to an upper reservoir, releasing it to a lower reservoir during peak load periods to generate electricity. The system operates by pumping water from a lower reservoir to a higher reservoir, storing energy and then generating electricity when needed. This method not only improves generator utilization but is also commercially important. During construction, penstocks must be installed within the straight tunnel.

[0003] During the installation of the straight section of the pressure steel pipe in the pumped storage power station, the excavation of the construction branch tunnel is limited, and only single sections can be transported to the installation site for installation. Traditional steel pipe installation involves unloading the pipe with a sky anchor, then transporting it to the installation location using a homemade trolley combined with a winch, and welding the circumferential seam manually. This results in slow construction efficiency and low safety. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose an automated construction process for the installation of straight section in-tunnel pressure steel pipes. The technical problem to be solved by this invention is: how to reduce manpower input and improve construction efficiency.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An automated construction process for installing a straight section of in-tunnel penstock includes the following steps: Step 1: Two sets of pre-buried holes are dug at the unloading position in the tunnel. Concrete is poured into the holes. The spacing is determined according to the size of the steel pipe. Two sets of sky anchors are taken out and fixed on the concrete. Step 2: Clean up the site, remove debris and obstacles, ensure that the site is flat and solid to meet the operation requirements, and reasonably plan the vehicle parking position and lifting operation area according to the storage location of the steel pipes and the operating radius of the crane; Step 3: Set up obvious warning signs at the unloading and lifting operation site, demarcate the operation area, and prohibit unauthorized personnel from entering; Step 4: Reasonably add cameras in the work area and install at least one alarm on site. The layout of the cameras ensures that the work scene can be captured.

[0006] Step 5: Determine the diameter, wall thickness, length and quantity of the steel pipes, and use an electric fall chain to unload the pipes. The electric fall chain should be installed on the top of the straight section hole. The fall chain connection point should be near the center of gravity of the steel pipe to ensure the balance of the steel pipe during lifting and to turn it over at the same time. Step 6: Use the seam welding trolley and the hydraulic assembly trolley to stack and assemble the three sections of steel pipes. The seam welding trolley is equipped with a self-adjusting function and can adapt to welding work on pipes or tanks of different diameters; Step 7: By converting the mains electricity into high-frequency alternating current through rectification and inversion, and then using electromagnetic induction to generate eddy current in the conductor, variable frequency electromagnetic heating of the pressure steel pipe is achieved, which has higher thermal efficiency and faster heating speed; Step 8: Use a submerged arc welding machine to weld the two circumferential seams after the stacking, using φ4.0 or φ5.0mm solid wire, current of 450A ~ 850A, voltage of 34V ~ 38V, welding speed of 350 ~ 500mm / min; use submerged arc welding to weld the inside, the weld penetration is between 1mm and 2mm, weld 2 ~ 3 layers and the total thickness is greater than 6mm, use φ4.0 or φ5.0mm solid wire, current of 400A ~ 600A, voltage of 31V ~ 35V, welding speed of 350 ~ 500mm / min; Step 9: Use a moving rolling welding trolley with a motor to transport the three sections of steel pipes after stacking and welding to the installation site for installation. During the falling process of the steel pipes, arrange special personnel to direct to ensure that the steel pipes are accurately placed in the predetermined position. When placing the steel pipes, pay attention to the neat placement of the steel pipes to avoid mutual squeezing and collision.

[0007] The working principle of the present invention is as follows: two groups of pre-buried holes are dug at the unloading position in the tunnel, concrete is poured into the holes, two groups of sky anchors are taken out and fixed on the concrete, the site is cleaned, the working area is demarcated, cameras and alarms are reasonably added, the layout of the cameras ensures that the working picture can be captured, an electric fall chain is used for unloading, the electric fall chain is installed on the top of the straight section of the tunnel, and it is turned over at the same time, a rolling welding trolley and a hydraulic group trolley are used to stack and assemble 3 sections of steel pipes, the rolling welding trolley is equipped with a self-adjusting function, and can adapt to welding work on pipes or tanks of different diameters, and the pressure steel pipe is subjected to variable frequency electromagnetic heating, which has higher thermal efficiency and faster heating speed, and finally used The submerged arc welding machine is used to weld the two circumferential seams after stacking, using solid welding wire of φ4.0 or φ5.0mm, with a current of 450A~850A, a voltage of 34V~38V, and a welding speed of 350~500mm / min; submerged arc welding is used to weld the inside, with a weld penetration of between 1mm and 2mm, welding 2~3 layers with a total thickness of >6mm, using solid welding wire of φ4.0 or φ5.0mm, with a current of 400A~600A, a voltage of 31V~35V, and a welding speed of 350~500mm / min, and a moving rolling welding trolley with a motor is used to transport the three sections of steel pipes after stacking to the installation site for installation.

[0008] In the step eight, multiple groups of support brackets are installed at the steel pipe installation position to ensure that the pressure steel pipe remains stable and does not roll. The spacing between each group of support brackets is determined according to the pressure steel pipe.

[0009] In step eight, a laser plumb line is set up and a jack is used to adjust the elevation and center deviation of the penstock so that the center of the target coincides with the light spot. If not, the operation needs to be repeated until the center and verticality of the penstock meet the requirements.

[0010] Compared with the prior art, the automated construction process for installing a straight section in-tunnel penstock has the following advantages: 1. In the present invention, a single section of steel pipe is transported to the unloading position, and an electric chain is used to unload and turn over. A roll welding trolley and a hydraulic assembly trolley are used to realize the stacking and assembly of three sections of pressure steel pipes. After variable frequency electromagnetic heating, a submerged arc welding machine is used to weld at the unloading position. After welding, the three sections of steel pipe are transported to the installation position by a roll welding trolley, realizing automated construction in the tunnel, reducing manpower input, and improving construction efficiency. Cameras and alarms are arranged on site for monitoring and alarm reminders to ensure installation safety and improve installation accuracy. DETAILED DESCRIPTION

[0011] The following are specific embodiments of the present invention, which further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0012] An automated construction process for installing a straight section of in-tunnel penstock includes the following steps: Step 1: Two sets of pre-buried holes are dug at the unloading position in the tunnel. Concrete is poured into the holes. The spacing is determined according to the size of the steel pipe. Two sets of sky anchors are taken out and fixed on the concrete. Step 2: Clean up the site, remove debris and obstacles, ensure that the site is flat and solid to meet the operation requirements, and reasonably plan the vehicle parking position and lifting operation area according to the storage location of the steel pipes and the operating radius of the crane; Step 3: Set up obvious warning signs at the unloading and lifting operation site, demarcate the operation area, and prohibit unauthorized personnel from entering; Step 4: Reasonably add cameras in the work area and install at least one alarm on site. The layout of the cameras ensures that the work scene can be captured.

[0013] Step 5: Determine the diameter, wall thickness, length and quantity of the steel pipes, and use an electric fall chain to unload the pipes. The electric fall chain should be installed on the top of the straight section hole. The fall chain connection point should be near the center of gravity of the steel pipe to ensure the balance of the steel pipe during lifting and to turn it over at the same time. Step 6: Use the seam welding trolley and the hydraulic assembly trolley to stack and assemble the three sections of steel pipes. The seam welding trolley is equipped with a self-adjusting function and can adapt to welding work on pipes or tanks of different diameters; Step 7: By converting the mains electricity into high-frequency alternating current through rectification and inversion, and then using electromagnetic induction to generate eddy current in the conductor, variable frequency electromagnetic heating of the pressure steel pipe is achieved, which has higher thermal efficiency and faster heating speed; Step 8: Use a submerged arc welding machine to weld the two circumferential seams after the stacking, using φ4.0 or φ5.0mm solid wire, current of 450A ~ 850A, voltage of 34V ~ 38V, welding speed of 350 ~ 500mm / min; use submerged arc welding to weld the inside, the weld penetration is between 1mm and 2mm, weld 2 ~ 3 layers and the total thickness is greater than 6mm, use φ4.0 or φ5.0mm solid wire, current of 400A ~ 600A, voltage of 31V ~ 35V, welding speed of 350 ~ 500mm / min; Step 9: Use a moving rolling welding trolley with a motor to transport the three sections of steel pipes after stacking and welding to the installation site for installation. During the falling process of the steel pipes, arrange special personnel to direct to ensure that the steel pipes are accurately placed in the predetermined position. When placing the steel pipes, pay attention to the neat placement of the steel pipes to avoid mutual squeezing and collision.

[0014] In the step eight, multiple groups of support brackets are installed at the steel pipe installation position to ensure that the pressure steel pipe remains stable and does not roll. The spacing between each group of support brackets is determined according to the pressure steel pipe.

[0015] In step eight, a laser plumb line is set up and a jack is used to adjust the elevation and center deviation of the penstock so that the center of the target coincides with the light spot. If not, the operation needs to be repeated until the center and verticality of the penstock meet the requirements.

[0016] The working principle of the present invention is as follows: two groups of pre-buried holes are dug at the unloading position in the tunnel, concrete is poured into the holes, two groups of sky anchors are taken out and fixed on the concrete, the site is cleaned, the working area is demarcated, cameras and alarms are reasonably added, the layout of the cameras ensures that the working picture can be captured, an electric fall chain is used for unloading, the electric fall chain is installed on the top of the straight section of the tunnel, and it is turned over at the same time, a rolling welding trolley and a hydraulic group trolley are used to stack and assemble 3 sections of steel pipes, the rolling welding trolley is equipped with a self-adjusting function, and can adapt to welding work on pipes or tanks of different diameters, and the pressure steel pipe is subjected to variable frequency electromagnetic heating, which has higher thermal efficiency and faster heating speed, and finally used The submerged arc welding machine is used to weld the two circumferential seams after stacking, using solid welding wire of φ4.0 or φ5.0mm, with a current of 450A~850A, a voltage of 34V~38V, and a welding speed of 350~500mm / min; submerged arc welding is used to weld the inside, with a weld penetration of between 1mm and 2mm, welding 2~3 layers with a total thickness of >6mm, using solid welding wire of φ4.0 or φ5.0mm, with a current of 400A~600A, a voltage of 31V~35V, and a welding speed of 350~500mm / min, and a moving rolling welding trolley with a motor is used to transport the three sections of steel pipes after stacking to the installation site for installation.

[0017] In summary, in the present invention, a single section of steel pipe is transported to the unloading position, and an electric chain is used to unload and turn over. A rolling welding trolley and a hydraulic assembly trolley are used to realize the stacking and assembly of three sections of pressure steel pipes. After variable frequency electromagnetic heating, a submerged arc welding machine is used to weld at the unloading position. After welding, the three sections of steel pipes are transported to the installation position by a rolling welding trolley, realizing automated construction in the tunnel, reducing manpower input, and improving construction efficiency. Cameras and alarms are arranged on site for monitoring and alarm reminders to ensure installation safety and improve installation accuracy.

[0018] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An automated construction process for installing a straight section of penstock in a tunnel, characterized in that: The steps include: Step 1: Two sets of pre-buried holes are dug at the unloading position in the tunnel. Concrete is poured into the holes. The spacing is determined according to the size of the steel pipe. Two sets of sky anchors are taken out and fixed on the concrete. Step 2: Clean up the site, remove debris and obstacles, ensure that the site is flat and solid to meet the operation requirements, and reasonably plan the vehicle parking position and lifting operation area according to the storage location of the steel pipes and the operating radius of the crane; Step 3: Set up obvious warning signs at the unloading and lifting operation site, demarcate the operation area, and prohibit unauthorized personnel from entering; Step 4: Arrange additional cameras in the work area and install at least one alarm on site. The layout of the cameras should ensure that the work scene can be captured; Step 5: Determine the diameter, wall thickness, length and quantity of the steel pipes, and use an electric fall chain to unload the pipes. The electric fall chain should be installed on the top of the straight section hole. The fall chain connection point should be near the center of gravity of the steel pipe to ensure the balance of the steel pipe during lifting and to turn it over at the same time. Step 6: Use the seam welding trolley and the hydraulic assembly trolley to stack and assemble the three sections of steel pipes. The seam welding trolley is equipped with a self-adjusting function and can adapt to welding work on pipes or tanks of different diameters; Step 7: By converting the mains electricity into high-frequency alternating current through rectification and inversion, and then using electromagnetic induction to generate eddy current in the conductor, variable frequency electromagnetic heating of the pressure steel pipe is achieved, which has higher thermal efficiency and faster heating speed; Step 8: Use a submerged arc welding machine to weld the two circumferential seams after the stacking, using φ4.0 or φ5.0mm solid wire, current of 450A ~ 850A, voltage of 34V ~ 38V, welding speed of 350 ~ 500mm / min; use submerged arc welding to weld the inside, the weld penetration is between 1mm and 2mm, weld 2 ~ 3 layers and the total thickness is greater than 6mm, use φ4.0 or φ5.0mm solid wire, current of 400A ~ 600A, voltage of 31V ~ 35V, welding speed of 350 ~ 500mm / min; Step 9: Use a moving rolling welding trolley with a motor to transport the three sections of steel pipes after stacking and welding to the installation site for installation. During the falling process of the steel pipes, arrange special personnel to direct to ensure that the steel pipes are accurately placed in the predetermined position. When placing the steel pipes, pay attention to the neat placement of the steel pipes to avoid mutual squeezing and collision.

2. The automated construction process for installing a straight section in-tunnel penstock according to claim 1 is characterized in that: In the step eight, multiple groups of support brackets are installed at the steel pipe installation position to ensure that the pressure steel pipe remains stable and does not roll. The spacing between each group of support brackets is determined according to the pressure steel pipe.

3. The automated construction process for installing a straight section in-tunnel penstock according to claim 1 is characterized in that: In step eight, a laser plumb line is set up and a jack is used to adjust the elevation and center deviation of the penstock so that the center of the target coincides with the light spot. If not, the operation needs to be repeated until the center and verticality of the penstock meet the requirements.