A gate installation method

Abstract

The present invention relates to the technical field of nuclear power plants, and in particular to a gate installation method. The present invention provides a method for installing a gate assembly on a gate channel, wherein the gate assembly includes a head, a lifting lug, a cylinder flange and a lug plate, and a pre-buried through-piece cylinder section is installed on the gate channel; the gate installation method includes the following steps: measuring and laying out on the inner wall of the containment, hoisting a support platform in place and installing the support platform, and installing a pedestrian connection platform between two support platforms. The positional relationship between the head and the ring hoist steel rope is adjusted by a first fall chain mechanism, so that the steel rope is in a vertical state and parallel to the head, and the ring hoist drives the head to rotate a certain angle around the axis of the containment, so that the head is smoothly and accurately hoisted to the gate channel, and the distance between the head and the support slide is shortened by the added second fall chain mechanism, and the gate assembly is hoisted to the support slide of the guide rail box in cooperation with the ring hoist, thereby improving the hoisting accuracy and efficiency of the head.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plants, and in particular to a gate installation method. Background Art

[0002] The equipment gate is an important device on the nuclear island containment of a nuclear power plant. Its main function is to serve as an access channel for large equipment in the reactor building during the construction of the nuclear power plant and during the shutdown and refueling period. During the operation of the nuclear power plant and in the event of an accident, the equipment gate is in a closed state to prevent the leakage of radioactive materials. The equipment gate is part of the containment pressure boundary and can withstand the loads of various design basis accidents to maintain the integrity and sealing of the containment.

[0003] The equipment gate of the "Hualong One" unit is composed of lifting device, head, cylinder flange, guide rail column, guide rail box, centering device, centering device, suspension device, guide device and other components.

[0004] The equipment gate is large in size, heavy in weight and requires high installation precision. How to complete the hoisting and installation of the gate head and ensure the welding quality of the cylinder flange components and the civil engineering penetration cylinder sections has always been a difficult problem faced during the installation of the equipment gate. Summary of the invention

[0005] (I) The problem to be solved by the present invention is: how to complete the hoisting and positioning of the gate head and ensure the welding quality of the cylinder flange assembly and the civil engineering penetration cylinder section.

[0006] (II) Technical solution

[0007] A gate installation method is used to install a gate assembly on a gate channel, the gate assembly includes a head, a lifting ear, a cylinder flange and a lug plate, and a pre-buried penetration cylinder section is installed on the gate channel;

[0008] The gate installation method comprises the following steps:

[0009] Measure and lay out the lines on the inner wall of the containment, hoist the support platform into place and install the support platform, and install the pedestrian connection platform between the two support platforms;

[0010] A limit device is installed on the inner wall of the containment below the support platform, the limit device supports the support platform, and then the lifting device is hoisted onto the support platform and installed in place;

[0011] Pre-assemble the guide rail column and the guide rail box on the ground, then flip the vertical guide rail column and hoist it into place, and then install the suspension device on the guide rail box;

[0012] Installing a support member on the inner wall of the containment just below the lower end of the guide rail column to support the guide rail column;

[0013] Connect the main hook of the ring crane to the gate assembly, then install the first fall chain mechanism at the parking position of the gate assembly, adjust the position of the gate assembly along the radial direction of the containment shell so that the ring crane rope is in a vertical state, then remove the first fall chain mechanism, and the ring crane lifts the gate assembly to the gate channel installation position so that the gate assembly is aligned with the support slide of the guide rail box, then install the second fall chain mechanism, and the second fall chain mechanism cooperates with the ring crane to lift the gate assembly to the support slide of the guide rail box, then lift the gate assembly to the suspension device, and then remove the second fall chain mechanism;

[0014] Move the gate assembly to the position of the embedded penetration cylinder section, weld the cylinder flange and the embedded penetration cylinder section, and then install the guide device and pedestrian passage platform on the head in turn.

[0015] According to one embodiment of the present invention, the first fall chain mechanism includes two first fall chains, two second fall chains and two shackles, and the step of connecting the ring crane main hook to the gate assembly and then installing the first fall chain mechanism at the parking position of the gate assembly includes respectively connecting the two shackles to the two lifting ears on the gate assembly, respectively connecting one end of the two steel wire ropes to the two shackles, and the other ends of the two steel wire ropes are connected to the ring crane main hook, and two first fall chains are respectively installed on both sides of the upper part of the gate assembly, and the two first fall chains are arranged in parallel, and the other ends of the two first fall chains are fixed to the inner wall of the containment shell, and then two second fall chains are respectively installed on both sides of the lower part of the gate assembly, and the other ends of the two second fall chains are fixed to the inner wall of the containment shell.

[0016] According to one embodiment of the present invention, the second fall chain mechanism includes two third fall chains and two fourth fall chains, and the step of installing the second fall chain mechanism includes installing two third fall chains on the two limit devices respectively, the other ends of the two third fall chains are respectively connected to the two lifting ears of the gate assembly, and two fourth fall chains are installed on the inner side of the bottom of the gate assembly, the two fourth fall chains are respectively located directly below the two third fall chains, and one end of the two fourth fall chains is fixed on the ground;

[0017] The step of the second fall chain mechanism cooperating with the ring crane to lift the gate assembly onto the supporting slide of the guide rail box includes: the ring crane drives the gate assembly to move toward the gate channel along the direction of the supporting slide, while the third fall chain and the fourth fall chain synchronously contract to pull the gate assembly toward the gate channel.

[0018] According to one embodiment of the present invention, the step of welding the cylinder flange and the embedded penetration cylinder section includes spot welding, positioning welding and full welding;

[0019] When spot welding, first check the ovality of the joint part between the cylinder flange and the embedded penetration cylinder section, control the verticality of the gate assembly, and control the misalignment between the cylinder flange and the embedded penetration cylinder section within a reasonable range, and then spot weld along the set distance between the joint parts;

[0020] During positioning welding, under the premise of ensuring that the verticality of the gate assembly is within a reasonable range, weld the horse plates at the edges on both sides of the center of the gate assembly in a clockwise or counterclockwise direction at the same time. While welding the horse plates, adjust the misalignment and the verticality of the gate assembly. After all the horse plates are welded, position weld them multiple times along the butt joint, and then cut off all the horse plates.

[0021] According to one embodiment of the present invention, the position limiting device comprises a beam body, a pin sleeve and an oblique support, the pin sleeve is mounted on the beam body, the oblique support is obliquely arranged on the beam body, and an embedded part is arranged on the inner wall of the containment below the support platform;

[0022] The method of installing the limit device on the inner wall of the containment below the support platform includes: using a ring crane to lift two limit devices to the embedded parts respectively, adjusting the positioning size and horizontality of the limit devices, welding the limit devices to the embedded parts, and then using high-strength bolts to fix the oblique support to the lower end of the support platform.

[0023] According to one embodiment of the present invention, the measuring and laying out of lines on the inner wall of the containment shell includes laying out the azimuth angle line and the vertical and horizontal center axes of the gate assembly on the inner wall of the containment shell, and taking the vertical center axis of the gate assembly as a reference, respectively measuring and laying out the installation positions of the lifting support platform, the limit device, the guide rail column, and the support structure.

[0024] According to one embodiment of the present invention, the hoisting of the supporting platform into place and installing the supporting platform, and installing the pedestrian connecting platform between the two supporting platforms include: using a ring crane to respectively hoist the two supporting platforms to the civil embedded parts on the inner wall of the containment, checking the elevation and positioning dimensions of the supporting platforms, and then welding the supporting platforms to the civil embedded parts, and then using a ring crane to hoist the pedestrian connecting platform between the two supporting platforms, and welding the pedestrian connecting platform to the two supporting platforms respectively.

[0025] According to one embodiment of the present invention, the support member comprises a horizontal beam and a tie rod, one end of the tie rod is hinged to the horizontal beam, and an embedded part for connecting the horizontal beam is provided on the inner wall of the containment;

[0026] The method of installing a support structure on the inner wall of the containment shell directly below the lower end of the guide rail column to support the guide rail column includes adjusting the installation position of the horizontal beam, connecting the lower end of the guide rail column to the horizontal beam by bolts, connecting one end of the horizontal beam to the embedded part, and then hinged one end of the pull rod to the top end of the horizontal beam, and fixing the other end of the pull rod to the inner wall of the containment shell.

[0027] According to one embodiment of the present invention, the guide device includes a transverse plate and a positioning pin shaft, and the positioning pin shaft is connected to the top of the transverse plate. The step of installing the guide device and the pedestrian passage platform on the head includes welding two guide devices on the outer walls on both sides of the gate assembly, and the two guide devices are respectively located directly below the two limit devices, and then two pedestrian passage platforms are respectively installed on the outer walls on both sides of the gate assembly, and the pedestrian passage platforms are vertically arranged and close to the support ear plates.

[0028] According to one embodiment of the present invention, during the spot welding, the misalignment between the cylinder flange and the embedded penetration cylinder section shall not be greater than 5.2 mm, during the positioning welding, the verticality of the gate assembly shall not be greater than 2.8 mm, and during the positioning welding, the weld length range is 30 to 50 mm.

[0029] Beneficial effects of the present invention:

[0030] The present invention provides a gate installation method for installing a gate assembly on a gate channel, wherein the gate assembly includes a head, a lifting lug, a cylinder flange and a lug plate, and a pre-buried penetration cylinder section is installed on the gate channel; the gate installation method includes the following steps:

[0031] Measure and lay out on the inner wall of the containment, hoist the support platform into place and install the support platform, and install a pedestrian connection platform between the two support platforms; install a limit device on the inner wall of the containment below the support platform, the limit device supports the support platform, and then hoist the lifting device onto the support platform and install it in place; pre-assemble the guide rail column and the guide rail box on the ground, then flip the upright guide rail column and hoist the guide rail column into place, and then install the suspension device on the guide rail box; install a support member on the inner wall of the containment just below the lower end of the guide rail column to support the guide rail column; connect the ring hoist main hook to the gate assembly, and then install a The first chain-falling mechanism adjusts the position of the gate assembly along the radial direction of the containment shell so that the hoisting rope of the ring crane is in a vertical state, and then the first chain-falling mechanism is removed. The ring crane lifts the gate assembly to the gate channel installation position so that the gate assembly is aligned with the supporting slide of the guide rail box, and then the second chain-falling mechanism is installed. The second chain-falling mechanism cooperates with the ring crane to lift the gate assembly onto the supporting slide of the guide rail box, and then the gate assembly is lifted to the position on the suspension device, and then the second chain-falling mechanism is removed; the gate assembly is moved to the position of the embedded penetration barrel section, the barrel flange is welded to the embedded penetration barrel section, and then the guide device and the pedestrian passage platform are installed on the head in turn.

[0032] The positional relationship between the head and the ring-lifting steel rope is adjusted by the added first fall chain mechanism, so that the steel rope is in a vertical state and parallel to the head. In this way, the ring lift drives the head to rotate a certain angle around the axis of the containment shell, so that the head can be smoothly and accurately lifted to the gate channel installation position. The added second fall chain mechanism is used to shorten the distance between the head and the supporting slideway, and the ring lift is used to lift the gate assembly onto the supporting slideway of the guide rail box. Then the gate assembly is lifted and positioned on the suspension device, so that the head can be smoothly lifted onto the supporting slideway of the guide rail box, thereby improving the lifting accuracy and efficiency of the head.

[0033] When the cylinder flange and the embedded penetration cylinder section are welded together, spot welding is first adopted, followed by positioning welding, and finally full welding. During the welding process, the misalignment and verticality are constantly adjusted to ensure that the flange and the embedded penetration cylinder section can be accurately assembled and the welding quality is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A flowchart provided for an embodiment of the present invention;

[0036] Figure 2 A diagram showing the dimensional deviation requirements of the guide rail posts provided in an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the hoisting of a guide rail column provided in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the installation of a first chain-falling mechanism provided in an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of the positions of the cylinder flange and the pre-buried cylinder section of the civil engineering provided in an embodiment of the present invention;

[0040] Figure 6 Direction diagram of the welding horse plate of the cylinder flange and the embedded penetration cylinder section provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] 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.

[0042] A gate installation method, such as Figure 1 As shown, it is used to install the gate assembly on the gate channel. The gate assembly includes a head, a lifting ear, a cylinder flange and a lug plate. The gate channel is installed with a pre-buried penetration cylinder section;

[0043] The gate installation method includes the following steps:

[0044] S1: Construction prerequisites check:

[0045] (1) The measurement microgrid used for construction has been laid out.

[0046] (2) The operating platform for measurement and layout, component installation, assembly, welding, grinding and other operations has been set up, and the erection and dismantling planning is reasonable to avoid repeated erection and dismantling or modification.

[0047] (3) The gate head and the cylinder flange are connected as a whole and have been hoisted to the nuclear reactor building and stored in a special storage device before the containment is capped. The prestressing of the containment has been completed.

[0048] (4) The ring crane in the nuclear reactor island building has been installed and has passed relevant tests and is ready for use.

[0049] (5) The relative humidity within 1m of the welding area shall not exceed 90%.

[0050] The construction area is well ventilated and lit, and safety protection measures have been put in place.

[0051] S2: Measurement and layout: According to the construction drawing of the equipment gate installation, lay out the azimuth angle line and the vertical and horizontal center axes of the gate assembly on the inner wall of the containment. Taking the vertical center axis of the gate assembly as the reference, measure and lay out the installation positions of the lifting support platform, limit device, guide rail column and support structure on the left and right sides respectively.

[0052] S3: Installation of lifting support platform and pedestrian connection platform:

[0053] Assemble the left and right lifting support platforms on the ground respectively, use a ring crane to lift the two support platforms to the embedded civil engineering parts on the inner wall of the containment, and adjust their positioning to ensure that the positions of the support platforms meet the predetermined positions. If necessary, cut related components according to construction requirements to meet the designed installation dimensions, then check the elevation, positioning dimensions and span of the support platforms, and then weld the support platforms to the embedded civil engineering parts.

[0054] The pedestrian connection platform is prefabricated and assembled in the workshop and subjected to sandblasting for anti-corrosion treatment. It is then hoisted to the 16.5m platform by a gantry crane and then hoisted between the two supporting platforms by a ring crane inside the nuclear reactor building. Finally, the pedestrian connection platform is connected to the two supporting platforms respectively. Note that the welding joints of the pedestrian connection platform should be dense and firm, without defects such as cracks and pores. The patterned steel plates should be flat after welding without warping. The connections on the guardrails must not be loose. Pay attention to check and tighten the connecting bolts.

[0055] In this step, it should be noted that the two lifting support platforms are divided into two sides located above the gate channel, the two lifting support platforms are symmetrically arranged about the gate channel, the pedestrian connecting platform is connected between the two support platforms, and guardrails are provided at the edges of the pedestrian connecting platform.

[0056] S4: Installation of limit devices and inclined supports:

[0057] Use the ring crane inside the nuclear reactor building to hoist the left and right limit devices to the embedded parts on the inner wall of the containment, and then adjust their positioning dimensions and horizontality. If necessary, cut related components according to construction requirements to meet the designed installation dimensions. The left and right limit devices can only be welded to the embedded parts after the installation positioning dimensions have been checked and qualified.

[0058] Then use high-strength bolts to fix the inclined support to the lower end of the support platform, and connect it to the lifting support platform with high-strength bolts. Then weld it. Strictly follow the requirements of relevant welding processes or welding data packages. After welding, tighten the high-strength bolts.

[0059] In step S4, it should be noted that the two limit devices are respectively located directly below the two lifting support platforms. The limit devices include a beam body, a pin sleeve and an oblique support. The pin sleeve is installed on the beam body, and the oblique support is inclined on the beam body. An embedded part is provided on the inner wall of the containment below the support platform. The embedded part is used to be welded with the beam body to fix the beam body. The beam body includes a first rod and a second rod welded together. The first rod and the second rod form a V-shaped beam body. The pin sleeve is installed at the connection between the first rod and the second rod. The limit device mainly plays two roles. The first role is to support the lifting support platform to improve the bearing capacity of the support platform. The second role is that the pin sleeve cooperates with the guide device on the head to play a role in limiting the height.

[0060] S5: Installation of lifting device:

[0061] Before winding the wire rope of the lifting device, it should be "broken" to release the stress and remove excess grease.

[0062] Wind the wire rope around the drum in the specified direction, pass the rope between the pulleys, and fix the wire rope to the drum with the pressure plate bolts.

[0063] Use the ring crane inside the nuclear reactor building to hoist the left and right lifting devices into place on the lifting support platform, adjust the center of the lifting device drum group to be consistent with the center of the lifting support platform, install the connecting bolts to the lifting support platform, and tighten them multiple times, evenly and symmetrically according to the designed torque value.

[0064] S6: Lifting device test run:

[0065] Check and confirm that there are no obstacles around the lifting device that may affect the test run.

[0066] Check and confirm that all parts, safety devices, mechanical devices, electrical devices, etc. on the lifting device have been installed as per the design requirements.

[0067] Check and confirm that the winch, pulley block, wire rope, etc. of the lifting device are in good condition, and the lubrication parts of each mechanical device are fully lubricated without leakage.

[0068] Check and confirm that all switches and levers of the electrical device are in the correct position, the power supply is normal, and all indicator lights are displaying normally.

[0069] Check and confirm that all fastening bolts are not loose and that the metal structure has no cracks or deformation.

[0070] Then carry out no-load test, rated load test, static load test and dynamic load test to ensure the safety of the lifting device.

[0071] S7: Installation of guide rail posts, guide rail boxes and suspension devices:

[0072] like Figure 3 As shown, place the guide rail post horizontally on the laid rail timbers on the ground, lift the guide rail box with a ring crane, align the hole of the guide rail box with the guide rail post, slowly insert the guide rail box into the guide post, and fix it firmly.

[0073] The assembly of the guide rail column and the guide rail box is hoisted and turned upright by using the ring crane in the nuclear reactor building, and then the ring crane trolley and hook are moved to hoist the assembly into place, and then the top of the guide rail column is welded to the bottom of the lifting support platform.

[0074] After the guide rail column and guide rail box are installed and adjusted, the guide rail box should be raised and lowered without load for at least 5 times to ensure that it moves along the guide rail within the travel range and maintains smooth movement without sticking.

[0075] According to the actual position of the ear shaft on the guide rail box, draw the installation position of the suspension device on the upper pad of the guide rail column, then install and adjust the fixed suspension device, and weld it after meeting various installation parameters. After the welding of the suspension device and the non-destructive testing of the weld are qualified, connect the guide rail box and the suspension device through the pin shaft.

[0076] When installing the guide rail posts, the left and right guide rail posts should be kept vertical and the two guide rails should be in parallel. Figure 2 As shown, The allowable deviation of the positioning dimensions of the two guide rail columns is: The distance deviation between the guide column and the gate channel is a≤±1mm, the distance deviation between the plane where the gate axis is located and the guide column is b≤±2mm; the distance deviation between the two guide columns is Lg≤±3mm.

[0077] It should be noted that the upper outer limit wheel of the guide rail box should be in contact with the guide rail column, the gap deviation between the upper inner limit wheel and the guide rail column is 2mm≤S≤4mm, and the lower limit wheel should be in contact with the guide rail column; after installation and adjustment, the distance deviation of the roller wheel rim of the guide rail box is 2mm≤S≤4mm, and the diagonal size of the guide rail box should not differ by more than 2mm.

[0078] It should be noted that the suspension device includes an upper suspension body and a lower suspension body, and the upper suspension body includes a suspension frame, a hook and a stop bar. The suspension frame is composed of two steel plates and is welded and fixed to the lower side of the gate lifting support platform; the hook is processed from a steel plate and is hinged to the suspension frame through a suspension shaft; the stop bar is processed from a steel plate and is hinged to the hook through a stop bar shaft, and a reinforcement plate is provided on the stop bar to increase the rigidity of the stop bar; the suspension frame is provided with a limit plate, which can be fixed to the suspension frame by welding to limit the extreme position of the hook and prevent the hook from swinging. The lower hanging body includes a guide rail box, a hanging ear and a hanging ear shaft; the guide rail box is fixed on the equipment gate, the hanging ear is fixed on the guide rail box, the hanging ear is limited to move in the vertical direction by the guide rail box, and the hanging ear shaft is fixed on the hanging ear; a limit block is provided at the end of the hanging ear shaft, the limit block is fixed to the hanging ear shaft by bolts, the upper part of the limit block is a protruding structure, which is conducive to contact with the stop bar. During the hanging process, the limit block can lift the stop bar to make the hanging ear shaft slide into the hanging position. The position of the hook corresponds to the position of the hanging ear shaft, and the position of the stop bar corresponds to the position of the limit block. The hanging device is a commonly used hanging head structure, so it will not be repeated here.

[0079] S8: Horizontal beam and tie rod installation:

[0080] Two support members are provided, and support members are installed on the inner wall of the containment shell directly below the lower end of each guide rail column to support the guide rail column. The support member includes a horizontal beam and a tie rod. The horizontal beam is a rectangular shell, and the tie rod is a long rod. The bottom end of the tie rod is hinged to the horizontal beam through a pin shaft. Two embedded parts for connecting the horizontal beam and two embedded parts for connecting the tie rod are provided on the inner wall of the containment shell;

[0081] Adjust the installation position of the horizontal beam, adjust the end of the horizontal beam close to the inner wall of the containment to face the embedded part, then connect the lower end of the guide column to the horizontal beam, weld the end of the horizontal beam close to the inner wall of the containment to the embedded part, then hinge one end of the tie rod to the top of the horizontal beam, and weld the other end of the tie rod to the embedded part on the inner wall of the containment. When installing the tie rod, the component can be cut according to the actual construction needs on site to meet the design requirements for the installation of the component. In addition, the guide column and the horizontal beam are connected with bolts, and the bolts should be tightened multiple times, symmetrically and evenly according to the design torque value.

[0082] S9: Head and shell flange lifting:

[0083] The gate channel is opened on the wall used to separate the reactor building from the outside world. The embedded penetration barrel section covers the gate channel. The head is hemispherical. The inner side of the head is equipped with a barrel flange by bolts. The barrel flange is connected to the embedded penetration barrel section to close the gate channel, thereby achieving a shielding effect to prevent the leakage of radioactive materials.

[0084] The gate head and cylinder flange of the equipment are connected into an assembly through temporary bolts and then hoisted to the site as a whole. Half of it is placed on a temporary storage device away from the gate passage. In order to ensure that after the cylinder flange and the embedded penetration are welded, the gate head and cylinder flange can be freely connected or disconnected, and the gate can be opened and closed normally, the gate head and cylinder flange are hoisted as a whole assembly on site and welded with the embedded penetration cylinder section until the main seam welding is completed, and then the temporary bolts are loosened.

[0085] First, the first step is to adjust the positional relationship between the head and the ring crane so that the ring crane can lift the head vertically. This is because the temporary storage device is set near the inner wall of the containment shell. At this time, the inner wall of the head is facing the inner wall of the containment shell. Because the travel of the ring crane cannot reach the inner wall of the containment shell, the steel rope is connected to the head at this time. The steel rope is in an inclined state. In this way, when the head is lifted, the head will swing back and forth, making a swing-like movement. Therefore, it is necessary to adjust the relationship between the head and the ring crane rope, such as Figure 4 As shown, the steel rope is made parallel to the head, so that the head can be lifted away more stably when rotating and lifting the head.

[0086] Specifically, Figure 4 As shown, the main hook of the ring crane is connected to the end cap, and then the first fall chain mechanism is installed at the end cap parking position. The first fall chain mechanism includes two first fall chains, two second fall chains and two shackles. The two shackles are respectively connected to the two lifting ears on the end cap, and one end of the two steel wire ropes is respectively connected to the two shackles. The other ends of the two steel wire ropes are connected to the main hook of the ring crane. Two first fall chains are respectively installed on both sides of the upper part of the end cap. The two first fall chains are arranged in parallel, and the other ends of the two first fall chains are fixed to the inner wall of the containment shell. Then two second fall chains are respectively installed on both sides of the lower part of the end cap, and the other ends of the two second fall chains are fixed to the inner wall of the containment shell. Then the ring crane moves inward, from Figure 4 From the perspective of lifting the head toward the left, at the same time, the two first fall chains and the two second fall chains are synchronously extended and kept in a tensioned state to prevent the head from shaking. When the two wire ropes are in a vertical state, the ring crane stops moving, that is, Figure 4 The state is in, and then the first fall chain and the second fall chain are removed.

[0087] Among them, the gate head weighs about 33.2t, the cylinder flange weighs about 5.2t, and the total weight of the two components is about 38.4t. Two 25t shackles (or 35t shackles) are used to connect with the lifting ears of the equipment gate head. Two steel wire ropes with a diameter of 52mm and a length of 16m (or two 80t slings) are connected to the shackles at one end and connected to the main hook of the ring crane trolley (205t) at the other end.

[0088] Then the ring hoist drives the head to rotate a certain angle around the axis of the containment shell, thereby lifting the head to the gate channel installation position. At this time, the inner side of the head is facing the gate channel, and the head is aligned with the support slide of the guide box.

[0089] Also, because the travel of the ring crane cannot reach the inner wall of the containment, that is, the head is always a certain distance away from the gate channel, the head cannot be directly lifted onto the supporting slide of the guide rail box. Therefore, a second fall chain mechanism is then installed, and the second fall chain mechanism cooperates with the ring crane to lift the head onto the supporting slide of the guide rail box.

[0090] Specifically, the second fall chain mechanism includes two third fall chains and two fourth fall chains. Two third fall chains are respectively installed on the beam bodies of the two limit devices. The other ends of the two third fall chains are respectively connected to the two lifting ears of the head. Two fourth fall chains are installed on the inner side of the bottom of the head. The two fourth fall chains are respectively located directly below the two third fall chains. One ends of the two fourth fall chains are connected to the ground. Among them, the two third fall chains and the two fourth fall chains are both located between the gate channel and the head. One end of the third fall chain is connected to the beam body, and the other end is connected to the lifting ear. The end of the third fall chain connected to the beam body is higher than the end connected to the lifting ear of the head, so that the two third fall chains are in an inverted figure eight shape. The ends of the two fourth fall chains connected to the inner side of the bottom of the head are slightly higher than the ends connected to the ground, forming a figure eight shape.

[0091] After the lifting ring hoists the head to face the supporting slide, the third and fourth fall chains are installed to drive the head to move along the supporting slide toward the gate channel. At the same time, the third and fourth fall chains are synchronously contracted to pull the head toward the gate channel, shortening the distance between the head and the supporting slide, and pulling the head onto the supporting slide.

[0092] The head is then lifted and positioned on the suspension device, and the second chain-falling mechanism is removed, thereby improving the hoisting accuracy and efficiency of the head.

[0093] S10: Assembly welding of cylinder flange and embedded penetration cylinder section:

[0094] Use the equipment gate lifting device and guide rail box to lift the equipment gate head to the embedded through-barrel section for assembly welding. Pay attention to ensure that the longitudinal and transverse center lines of the equipment gate head are aligned with the vertical and horizontal center axes of the embedded through-piece sleeve. The ovality of the butt joint of the through-piece barrel section, that is, whether the edge of the through-flange and the edge of the embedded through-barrel section are aligned, check the butt joint of the flange and the embedded through-piece barrel section to ensure smooth assembly. During the assembly process, pay attention to monitoring the verticality changes of the gate head and control the verticality of the gate assembly, that is, whether the head is in a vertical state and whether the head is perpendicular to the ground. There should be no tilt at the top or bottom of the head, and ensure that the top inner side and the bottom inner side of the head are in the same vertical plane.

[0095] During spot welding, the misalignment between the cylinder flange and the pre-buried cylinder section of the civil engineering should be controlled within a reasonable range, such as Figure 5 As shown in the figure, the misalignment between the cylinder flange and the pre-buried cylinder section of the civil engineering shall not exceed 5.2mm, and then spot welding shall be performed along the butt joint, with the same interval between each spot welding. If there is a problem, correct its ovality in time to ensure smooth assembly welding.

[0096] During positioning welding, while ensuring that the verticality deviation of the gate assembly's cylinder section interface does not exceed 2.8mm, weld the horse plates at the edges on both sides of the center of the gate assembly in a clockwise or counterclockwise direction. While welding the horse plates, adjust the misalignment and the verticality of the gate assembly. After all the horse plates are welded, position weld them multiple times along the butt joint, and then cut off all the horse plates.

[0097] Specifically, Figure 6 As shown in the figure, two groups of workers are arranged symmetrically on both sides of the gate center to use horse plates to make group adjustments in the same direction. It should be explained here that the horse plates are welded at both ends of the transverse diameter of the cylinder flange, that is, from Figure 6 The horse plates are welded starting from points A and B in the figure. The personnel at one end gradually weld the horse plates in a clockwise direction. At the same time, the personnel at the other end also gradually weld the horse plates in a clockwise direction. The two groups of personnel try to keep a synchronized welding speed, that is, the two groups of personnel are always in a symmetrical position. This way of welding the horse plates is conducive to the pairing of the cylinder flange and the embedded penetration cylinder section, and is more conducive to reducing the gap between the two groups.

[0098] Preferably, the weld length of the positioning weld should be 30 to 50 mm, and the assembly gap requirement should be 0 to 3 mm.

[0099] Finally, perform full welding to eliminate all gaps.

[0100] S11; Pedestrian walkway platform and guide device installation:

[0101] The guide device includes a transverse plate and a positioning pin shaft, and the positioning pin shaft is connected to the top of the transverse plate. When installing the guide device, two guide devices are welded on the outer walls on both sides of the head respectively. When the head is lifted, the two guide devices are located directly below the two limit devices respectively. Two pedestrian passage platforms are installed on the outer walls on both sides of the gate assembly respectively. The pedestrian passage platforms are vertically arranged and close to the support ear plates.

[0102] Specifically, the guide device is located on the left and right sides of the middle position of the outer side of the head. The left and right guide devices are inserted into the interface component of the gate head and firmly fixed. When the gate head is lifted to a higher height, the positioning pin shaft of the guide device penetrates into the sleeve of the limit device.

[0103] The interfaces between the left and right guide devices and the gate heads are adjusted by horse plates or assembly tools, and can be positioned and welded while being adjusted. The assembly clearance is required to be 0 to 5 mm, and the misalignment is required to be 0 to 3 mm.

[0104] The two pedestrian access platforms are respectively located on the left and right sides of the outer wall of the head. The two pedestrian access platforms are two scaffolds. The two scaffolds are vertically arranged. The top of the scaffolds extends to the lifting support platform, and the bottom of the scaffolds is located below the guide device for construction workers to climb and install.

[0105] S11; Guide rails, centering and centring devices:

[0106] Two guide rails are fixed on the cylinder flange, and centering and alignment devices are installed on both sides of the lower part of the head. When the equipment gate is closed, the roller falls on the guide rail shaft to position it so that the bolt holes of the two flanges are aligned.

[0107] The centering device is located on one side of the lower part of the outer wall of the head, and the centering device is located on the other side of the lower part of the outer wall of the head. The two guide rails correspond to the centering device and the centering device respectively. One guide rail is located directly below the centering device, and the other guide rail is located directly below the centering device. The two guide rails are respectively fixed on the left and right sides of the cylinder flange and welded to the side of the cylinder flange.

[0108] S12: Equipment gate opening and closing test

[0109] After the overall installation of the on-site equipment gate is completed, a full-process hoisting test is required. The door opening process starts from loosening the bolts, opening the gate, moving the latch out horizontally to lock it, and lifting it to the hanging state. The door closing process is the opposite. The specific test requirements are as follows:

[0110] (1) Loosen the fastening bolts of the gate flange, open the gate, and move the latch horizontally to lock it;

[0111] (2) The gate head is opened and closed horizontally by a manual push rod (the gate center of gravity can be adjusted to move 50 mm forward and backward), keeping the head action synchronized and preventing left and right deviations that cause the head to move out or in.

[0112] (3) Start the lifting device, and the guide rail box runs on the installed lifting bracket. Under the action of the head load, there is no phenomenon that the limit wheel is stuck, the guide rail box cannot be raised or lowered, etc., which affects the normal lifting. Determine the upper and lower limit deviations allowed for normal lifting of the guide rail box.

[0113] (4) The guide box runs on the installed lifting bracket. Under the action of the hook shaft, the suspension device completes the hooking and unhooking actions. The stopper strip rebounds accurately under the action of the spring. The limit of the hook shaft should be flexible and reliable. Repeatedly lift and lower 5 times under the action of the head load to determine the action height value of the hook shaft and the rebound reliability of the stopper strip.

[0114] (5) When the lifting device is powered off, manually release the load to keep the left and right lifting devices raised and lowered in unison to prevent the guide rail box from getting stuck or being unable to rise or fall.

[0115] After the test is completed, the equipment gate head and the cylinder flange are connected and tightened with formal bolts. The main bolts are tightened symmetrically and evenly four times according to the design torque value.

[0116] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0117] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0118] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gate installation method for installing a gate assembly on a gate passage, characterized in that: The gate assembly includes a head, a lifting lug, a cylinder flange and a lug plate, and a pre-buried penetration cylinder section is installed on the gate channel; The gate installation method comprises the following steps: Measure and lay out the lines on the inner wall of the containment, hoist the support platform into place and install the support platform, and install the pedestrian connection platform between the two support platforms; A limit device is installed on the inner wall of the containment below the support platform, the limit device supports the support platform, and then the lifting device is hoisted onto the support platform and installed in place; Pre-assemble the guide rail column and the guide rail box on the ground, then flip the vertical guide rail column and hoist it into place, and then install the suspension device on the guide rail box; Installing a support member on the inner wall of the containment just below the lower end of the guide rail column to support the guide rail column; Connect the main hook of the ring crane to the gate assembly, then install the first fall chain mechanism at the parking position of the gate assembly, adjust the position of the gate assembly along the radial direction of the containment shell so that the ring crane rope is in a vertical state, then remove the first fall chain mechanism, and the ring crane lifts the gate assembly to the gate channel installation position so that the gate assembly is aligned with the support slide of the guide rail box, then install the second fall chain mechanism, and the second fall chain mechanism cooperates with the ring crane to lift the gate assembly to the support slide of the guide rail box, then lift the gate assembly to the suspension device, and then remove the second fall chain mechanism; Move the gate assembly to the position of the embedded penetration barrel section, weld the barrel flange to the embedded penetration barrel section, and then install the guide device and the pedestrian passage platform on the head in turn; The step of welding the cylinder flange and the pre-buried penetration cylinder section comprises spot welding, positioning welding and full welding; When spot welding, first check the ovality of the joint part between the cylinder flange and the embedded penetration cylinder section, control the verticality of the gate assembly, and control the misalignment between the cylinder flange and the embedded penetration cylinder section within a reasonable range, and then spot weld along the set distance between the joint parts; During positioning welding, under the premise of ensuring that the verticality of the gate assembly is within a reasonable range, weld the horse plates at the edges on both sides of the center of the gate assembly in a clockwise or counterclockwise direction at the same time. While welding the horse plates, adjust the misalignment and the verticality of the gate assembly. After all the horse plates are welded, position weld them multiple times along the butt joint, and then cut off all the horse plates.

2. A gate installation method according to claim 1, characterized in that: The first fall chain mechanism includes two first fall chains, two second fall chains and two shackles. The step of connecting the ring crane main hook to the gate assembly and then installing the first fall chain mechanism at the parking position of the gate assembly includes respectively connecting the two shackles to the two lifting ears on the gate assembly, respectively connecting one end of the two steel wire ropes to the two shackles, and the other ends of the two steel wire ropes are connected to the ring crane main hook, and two first fall chains are respectively installed on both sides of the upper part of the gate assembly, and the two first fall chains are arranged in parallel, and the other ends of the two first fall chains are fixed to the inner wall of the containment shell, and then two second fall chains are respectively installed on both sides of the lower part of the gate assembly, and the other ends of the two second fall chains are fixed to the inner wall of the containment shell.

3. A gate installation method according to claim 1, characterized in that: The second fall chain mechanism comprises two third fall chains and two fourth fall chains, and the step of installing the second fall chain mechanism comprises installing two third fall chains on the two limit devices respectively, the other ends of the two third fall chains are respectively connected to the two lifting ears of the gate assembly, and two fourth fall chains are installed on the inner side of the bottom of the gate assembly, the two fourth fall chains are respectively located directly below the two third fall chains, and one end of the two fourth fall chains is fixed to the ground; The step of the second fall chain mechanism cooperating with the ring crane to lift the gate assembly onto the supporting slide of the guide rail box includes: the ring crane drives the gate assembly to move toward the gate channel along the direction of the supporting slide, while the third fall chain and the fourth fall chain synchronously contract to pull the gate assembly toward the gate channel.

4. A gate installation method according to claim 1, characterized in that: The limiting device comprises a beam body, a pin sleeve and an oblique support, the pin sleeve is mounted on the beam body, the oblique support is obliquely arranged on the beam body, and an embedded part is arranged on the inner wall of the containment below the support platform; The method of installing the limit device on the inner wall of the containment below the support platform includes: using a ring crane to lift two limit devices to the embedded parts respectively, adjusting the positioning size and horizontality of the limit devices, welding the limit devices to the embedded parts, and then using high-strength bolts to fix the oblique support to the lower end of the support platform.

5. A gate installation method according to claim 1, characterized in that: The measuring and laying out on the inner wall of the containment shell includes laying out the azimuth angle line and the vertical and horizontal center axes of the gate assembly on the inner wall of the containment shell, and taking the vertical center axis of the gate assembly as a reference, respectively measuring and laying out the installation positions of the lifting support platform, the limit device, the guide rail column, and the support structure.

6. A gate installation method according to claim 1, characterized in that: The described hoisting of the supporting platform into place and installation of the supporting platform and installation of the pedestrian connecting platform between the two supporting platforms includes: using a ring crane to respectively hoist the two supporting platforms to the civil embedded parts on the inner wall of the containment, checking the elevation and positioning dimensions of the supporting platforms, and then welding the supporting platforms to the civil embedded parts, and then using a ring crane to hoist the pedestrian connecting platform between the two supporting platforms, and welding the pedestrian connecting platform to the two supporting platforms respectively.

7. A gate installation method according to claim 1, characterized in that: The support member comprises a horizontal beam and a tie rod, one end of the tie rod is hinged to the horizontal beam, and an embedded part for connecting the horizontal beam is provided on the inner wall of the containment; The method of installing a support structure on the inner wall of the containment shell directly below the lower end of the guide rail column to support the guide rail column includes adjusting the installation position of the horizontal beam, connecting the lower end of the guide rail column to the horizontal beam by bolts, connecting one end of the horizontal beam to the embedded part, and then hinged one end of the pull rod to the top end of the horizontal beam, and fixing the other end of the pull rod to the inner wall of the containment shell.

8. A gate installation method according to claim 1, characterized in that: The guide device includes a transverse plate and a positioning pin shaft, and the positioning pin shaft is connected to the top of the transverse plate. The step of installing the guide device and the pedestrian passage platform on the head includes welding two guide devices on the outer walls on both sides of the gate assembly, and the two guide devices are respectively located directly below the two limit devices, and then two pedestrian passage platforms are respectively installed on the outer walls on both sides of the gate assembly, and the pedestrian passage platforms are vertically arranged and close to the support ear plates.

9. A gate installation method according to claim 1, characterized in that: During the spot welding, the misalignment between the cylinder flange and the embedded penetration cylinder section shall not be greater than 5.2 mm. During the positioning welding, the verticality of the gate assembly shall not be greater than 2.8 mm. During the positioning welding, the weld length range is 30 to 50 mm.

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