Inspection and maintenance method of reflecting surface and ring beam connecting device

Abstract

The invention discloses an inspection and maintenance method for a connecting device of a reflecting surface and a ring beam, belongs to the technical field of maintenance of a large-span spherical reflecting surface, and solves the technical problem of transformation and maintenance of a hoop under the condition that normal observation of a telescope is not influenced. The method comprises the steps that construction technology disclosure is conducted on team members before construction, so that each operator can master the basic skills of work types engaged by the operator, and cross operation among all procedures is well coordinated; all the quadrilateral reflecting surface units are detected in a visual and auditory mode around the ring beam by one circle, and the damaged quadrilateral reflecting surface units are determined and recorded; the damaged hoop is transformed and maintained under the condition that telescope observation and an existing structural form are not influenced, so that a portal of a new hoop cannot interfere with a 2 # connecting mechanism of a quadrilateral reflecting surface unit; and after the hoop transformation construction is completed, multiple teams and groups perform cross inspection, and the construction condition of new hoop installation is recorded. The hoop can be transformed and maintained without affecting normal observation of the telescope.

Description

Technical Field

[0001] The invention relates to the technical field of maintenance of a large-span spherical reflective surface, and more specifically, to an inspection and maintenance method for a reflective surface and a ring beam connection device. Background Art

[0002] The FAST reflector unit is composed of panels, adjustment devices, back frames, bolts, connecting mechanisms and other structures or components. The quadrilateral reflector unit is located at the edge of the cable net, such as Figure 1 As shown, the quadrilateral reflector unit 2 is connected to the lower chord of the ring beam 1; the quadrilateral reflector unit 2 is a quadrilateral structure, with a total of 150 pieces of 30 types. The two 2# connecting mechanisms of the quadrilateral reflector unit 2 are placed on the hoop 3 of the annular steel pipe of the lower chord of the ring beam 1, and the other two endpoints 0# and 1# of the quadrilateral unit are respectively connected to the upper plate of the cable net node.

[0003] When the telescope is working, there is relative movement between the cable net node disks, and the 1# and 2# connection mechanisms of the reflector unit can slide adaptively. At present, the 2# connection mechanism of the quadrilateral unit interferes with the gantry 4 of the existing clamp 3, such as Figure 2 As shown, the height and width of the gantry 4 are insufficient. At present, the rods 5 of some quadrilateral units 1 have been damaged. The rods 5 cannot effectively contact the stainless steel plates 6 of the clamps 3, affecting the detection accuracy and working stability of FAST. It is necessary to modify and maintain the 2# end shaft clamp without affecting the normal observation of the FAST telescope. Summary of the invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art, and an object of the present invention is to provide an inspection and maintenance method for a connecting device between a reflecting surface and a ring beam.

[0005] The technical solution of the present invention is: a method for inspecting and maintaining a connecting device between a reflective surface and a ring beam, comprising the following steps:

[0006] Step 1. Technical preparation: Before construction, the team members should be briefed on the construction technology so that each operator can master the basic skills of the work they are engaged in, coordinate the cross-operation between the various processes, create construction conditions for each other, avoid mutual harm, and thus effectively ensure the quality and safety of the project;

[0007] Step 2. Conduct on-site inspection, walk around the ring beam, visually and auditorily inspect each quadrilateral reflector unit, identify the damaged quadrilateral reflector unit, and keep records;

[0008] Step 3. Reconstruct the clamp, and reconstruct and maintain the damaged clamp without affecting the telescope observation and the existing structure. Reconstruct and design a new clamp according to the clamp reconstruction test and simulation calculation, and use the new clamp to replace the damaged clamp, so that the gantry of the new clamp will not interfere with the 2# connection mechanism of the quadrilateral reflector unit;

[0009] Step 4. Construction quality inspection. After the clamp modification construction is completed, multiple teams will conduct cross-checks to ensure that all parts are installed firmly and the high-strength screw torque of the new clamp meets the original design requirements. The high-strength screw torque of the new clamp will be measured and verified again during the telescope's suspension of observation. During the construction process, the construction status of the new clamp installation is recorded to ensure that each new clamp installation is documented.

[0010] As a further improvement, the method further includes step 5, wherein after the new clamps meet the requirements after being tested in use, the new clamps are used to gradually replace the original clamps.

[0011] Furthermore, during telescope observations, taking into account the normal displacement range of the reflecting surface and the electromagnetic compatibility requirements of the telescope equipment, the equipment, tooling, reflecting surface units being maintained and temporary support structures used in on-site construction must not interfere with, interfere with or collide with existing telescope facilities, and maintenance construction must be carried out using machinery without electronic equipment to avoid affecting telescope observations.

[0012] Furthermore, in step 3, the published telescope observation plan is received in advance every day, and the construction position is adjusted in time to ensure the construction period.

[0013] Furthermore, in step 3, only one clamp of the quadrilateral reflective surface unit can be removed at a time, and the other clamp can be retained to ensure the force balance of the quadrilateral reflective surface unit on the cable net, ensuring that the observation is not affected and the quadrilateral reflective surface unit is intact and does not fall off.

[0014] Furthermore, the construction process of clamp removal is as follows:

[0015] Preparation of construction machinery → Installation of construction platform → Hanging of anti-fall net → Construction workers mark the clamps → Hang and fix the clamps with hand winches → Use extended wrenches to remove the original high-strength bolts → Lift the clamps into the ring beam horseway and transport them to the roadside with a flatbed truck → Use a car to transport the clamps to the designated factory for processing → Remove the construction platform.

[0016] Furthermore, the installation process of the clamp is as follows:

[0017] Preparation of construction machinery → Installation of construction platform → Hanging of anti-fall net → Transporting the modified new clamp to the construction site → Checking the serial number and hoisting the new clamp to the installation site by hand hoist → Hoisting the 2# end of the quadrilateral reflective surface unit by hand hoist → Cleaning the clamp installation site → Determine the installation site and installation angle → Locking the new clamp with high-strength bolts → Installing the stainless steel plate of the tray → Installing and adjusting the door frame and lens → Anti-corrosion of high-strength bolts → Overall surface paint treatment.

[0018] Furthermore, during the construction of the clamp modification, timely maintenance is carried out on the rust on the edge cable heads and local locations of the steel structure inside the ring beam.

[0019] Furthermore, a new hoop is obtained by enlarging the door frame size of the original hoop, wherein the new hoop comprises a hoop body, an extended steel plate is provided on the top of the pallet steel plate of the hoop body, the width of the extended steel plate is greater than the width of the pallet steel plate, a stainless steel plate is provided on the top of the extended steel plate, support rods of L-shaped structure are respectively provided on both sides of the stainless steel plate, the upper ends of the support rods on both sides are commonly connected with cross bars, vertical rods are respectively provided at both ends of the cross bar, observation mirrors are connected between the vertical rods at both ends, the width of the extended steel plate is not less than 400 mm, and the height is not less than 300 mm, the width between the support rods on both sides is not less than 350 mm, and the height of the cross bar is not less than 260 mm.

[0020] Furthermore, the pallet steel plate is welded to the extended steel plate, and a first threaded section is provided at the lower end of the support rod, which passes through the stainless steel plate and the extended steel plate in turn and is locked by a double nut, and a cotter pin is provided at the first threaded section below the double nut, and a second threaded section is provided at the upper end of the support rod, and threaded holes matching the second threaded section are provided at both ends of the cross bar, and a tightening nut is provided at the second threaded section, and a first nut is provided at the vertical rod, and second nuts are provided at both sides of the observation mirror, respectively, and the first nut and the second nut are connected by a first bolt, and the stainless steel plate and the extended steel plate are connected by a second bolt.

[0021] Beneficial Effects

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention does not affect the normal observation of the FAST telescope during the construction process, and realizes the modification and maintenance of the clamp without affecting the normal observation of the telescope. After the modification and maintenance is completed, the connecting mechanism no longer interferes with the clamp gantry, thereby ensuring the detection accuracy and working stability of the telescope.

[0024] 2. During the construction of the clamp, the present invention promptly maintains the rust on the edge cable heads and the local position of the inner steel structure of the ring beam, effectively ensuring the life of the equipment and the working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a top view of the FAST reflector unit;

[0026] Figure 2 It is a schematic diagram of the interference between the 2# connection mechanism of the quadrilateral unit and the portal frame of the original clamp;

[0027] Figure 3 is a flow chart of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the new clamp in the present invention;

[0029] Figure 5 It is a schematic diagram of the main structure of the door frame of the new clamp in the present invention;

[0030] Figure 6 It is a left-side structural schematic diagram of a door frame of a new clamp in the present invention;

[0031] Figure 7 It is a structural schematic diagram of the support rod in the present invention;

[0032] Figure 8 It is a schematic diagram of the main structure of the horizontal rod and the vertical rod in the present invention;

[0033] Fig. 9 It is a left-side structural schematic diagram of the horizontal rod and the vertical rod in the present invention;

[0034] Fig.10 It is a structural schematic diagram of the observation mirror in the present invention;

[0035] Fig.11 It is a schematic diagram of maintaining a construction record sheet in the present invention.

[0036] Among them: 1-ring beam, 2-quadrilateral reflective surface unit, 3-hoop, 4-gantry, 5-rod, 6-stainless steel plate, 7-new hoop, 8-hoop body, 9-tray steel plate, 10-expanded steel plate, 11-stainless steel plate, 12-support rod, 13-cross bar, 14-vertical pole, 15-observation mirror, 16-first threaded segment, 17-double nut, 18-open pin, 19-second threaded segment, 20-threaded hole, 21-tightening nut, 22-first nut, 23-second nut, 24-first bolt, 25-second bolt. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0038] See also Figures 1 to 11 , a method for inspecting and maintaining a connection device between a reflective surface and a ring beam, comprising the following steps 1 to 4:

[0039] Step 1. Technical preparation. Before construction, the construction technology is explained to the team members so that each operator can master the basic skills of the work they are engaged in, coordinate the cross-operation between the various processes, create construction conditions for each other, avoid mutual harm, and effectively ensure the quality and safety of the project. Since each work point is high-altitude operation, there is a risk of falling from height and falling objects from height. All operators are certified to work, and the implementation of the "three-level safety education" and daily pre-shift meetings is the prerequisite for ensuring the safe and smooth progress of the project.

[0040] Step 2. On-site inspection: walk around the ring beam 1 and inspect each quadrilateral reflective surface unit 2 visually and auditorily, identify the damaged quadrilateral reflective surface unit 2, and make a record.

[0041] Step 3. Perform reconstruction work on the clamp. Under the condition that the telescope observation and the existing structural form are not affected, the damaged clamp 3 is reconstructed and maintained. According to the clamp reconstruction test and simulation calculation, a new clamp 7 is reconstructed and designed. The damaged clamp 3 is replaced with the new clamp 7 so that the door frame of the new clamp 7 will not interfere with the 2# connection mechanism of the quadrilateral reflective surface unit 2.

[0042] Step 4. Construction quality inspection. After the clamp modification is completed, multiple teams will conduct cross-checks to ensure that all parts are firmly installed and the torque of the high-strength screw of the new clamp 7 meets the original design requirements. During the telescope's observation period, the high-strength screw torque of the new clamp 7 is measured and checked again to ensure that the torque meets the design requirements. During the construction process, the construction status of the new clamp 7 installation is recorded to ensure that each new clamp 7 installation is well documented, such as Fig.11 shown.

[0043] Through on-site inspections, weekly meetings, and mutual communication, we can understand the on-site construction situation, raise problems existing in the construction process through weekly meetings and require the construction party to make timely improvements, to ensure that problems do not accumulate and that deficiencies on site are improved in a timely manner.

[0044] Furthermore, step 5 is included, after the new clamp 7 meets the requirements after the use test, that is, after the durability and stability test of the new clamp 7 are passed, the new clamp 7 is used to gradually replace the original clamp, and all the new clamps 7 are used.

[0045] During the construction of the clamp modification, construction workers must not cause damage to the panel unit itself, and must not damage existing equipment and facilities. During the telescope observation period, considering the normal displacement range of the reflector and the electromagnetic compatibility requirements of the telescope equipment, the equipment, tooling, reflector unit being maintained and temporary support structures used in the on-site construction must not interfere with, interfere with or collide with the existing telescope facilities. Machinery without electronic equipment must be used for maintenance and construction to avoid affecting the telescope observation.

[0046] In step 3, the telescope observation plan is received in advance every day and the construction location is adjusted in time to ensure the construction period.

[0047] Each quadrilateral reflective surface unit 2 has two 2# connection mechanisms, i.e., two clamping hoop operation positions. When removing the clamping hoop, after calculation and testing, in step 3, only one clamping hoop 3 of the quadrilateral reflective surface unit 2 can be removed at a time, and the other clamping hoop 3 is retained to meet the force balance of the quadrilateral reflective surface unit 2 on the cable net, to ensure that the observation is not affected and the quadrilateral reflective surface unit 2 is intact and does not fall off.

[0048] During the hoop modification process, the extension steel plate of the new hoop needs to be welded on the tray steel plate of the original hoop. In order to ensure that FAST observation is not disturbed and to ensure the welding quality, the original hoop single points are removed one by one at the construction site and transported to the designated factory for welding. Gas shielded welding is used for welding. Interval welding is used during welding, and the wet cloth cooling method is used to prevent the steel plate from deformation. After the tray steel plate is welded, it is painted for corrosion protection and then transported to the construction site for installation.

[0049] The construction process of hoop removal is as follows:

[0050] Preparation of construction machinery → Installation of construction platform → Hanging of anti-fall net → Construction workers mark the clamps → Hang and fix the clamps with hand winches → Use extended wrenches to remove the original high-strength bolts → Lift the clamps into the ring beam horseway and transport them to the roadside with a flatbed truck → Use a car to transport the clamps to the designated factory for processing → Remove the construction platform.

[0051] The installation process of the clamp is as follows:

[0052] Preparation of construction machinery → Installation of construction platform → Hanging of anti-fall net → Transporting the modified new clamp to the construction site → Checking the serial number and hoisting the new clamp to the installation site by hand hoist → Lifting the 2# end of the quadrilateral reflective surface unit by hand hoist → Cleaning the clamp installation site (degreasing and derusting) → Determine the installation site and installation angle → Locking the new clamp with high-strength bolts → Installing the stainless steel plate of the tray → Installing and adjusting the door frame and lens → Anti-corrosion of high-strength bolts → Overall surface paint treatment → Dismantling of construction platform.

[0053] During the reconstruction construction of the clamp, the rust on the edge cable head and the local location of the inner steel structure of the ring beam 1 was maintained in time, that is, rust removal and polishing were carried out in time, and then covered with anti-corrosion materials (protective paint) to avoid further expansion of the problem, effectively ensuring the life of the equipment and working stability.

[0054] In this embodiment, the new hoop 7 is obtained by enlarging the door frame size of the original hoop. Specifically, the new hoop 7 includes a hoop body 8, an extended steel plate 10 is provided on the top of the pallet steel plate 9 of the hoop body 8, the width of the extended steel plate 10 is greater than the width of the pallet steel plate 9, a stainless steel plate 11 is provided on the top of the extended steel plate 10, and L-shaped support rods 12 are provided on both sides of the stainless steel plate 11, and the upper ends of the support rods 12 on both sides are connected to a cross bar 13, and the two ends of the cross bar 13 are respectively provided with vertical rods 14, and an observation mirror 15 is connected between the vertical rods 14 at both ends, the width of the extended steel plate 10 is not less than 400mm, and the height is not less than 300mm, the width between the support rods 12 on both sides is not less than 350mm, and the height of the cross bar 13 is not less than 260mm. Adding an observation mirror 15 to the door frame can facilitate inspection, and the operator can directly observe whether the rods of the 2# connection mechanism are interfered and damaged on the ring beam 1.

[0055] The pallet steel plate 9 is welded to the extended steel plate 10, the lower end of the support rod 12 is provided with a first threaded section 16, the first threaded section 16 passes through the stainless steel plate 11 and the extended steel plate 10 downwards in sequence and is locked by a double nut 17, the first threaded section 16 below the double nut 17 is provided with a split pin 18, the upper end of the support rod 12 is provided with a second threaded section 19, both ends of the cross bar 13 are provided with threaded holes 20 adapted to the second threaded section 19, the second threaded section 19 is provided with a tightening nut 21, the vertical rod 14 is provided with a first nut 22, and the two sides of the observation mirror 15 are provided with second nuts 23, the first nut 22 and the second nut 23 are connected by a first bolt 24, and the stainless steel plate 11 and the extended steel plate 10 are connected by a second bolt 25. After loosening the first bolt 24, the angle of the observation mirror 15 can be easily adjusted, and the first bolt 24 can be tightened after adjustment.

[0056] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for inspection and maintenance of a reflective surface and ring beam connection device, characterized in that: The following steps are involved: Step 1. Technical preparation: Before construction, the team members should be briefed on the construction technology so that each operator can master the basic skills of the work they are engaged in, coordinate the cross-operation between the various processes, create construction conditions for each other, avoid mutual harm, and thus effectively ensure the quality and safety of the project; Step 2. Conduct an on-site inspection, walk around the ring beam (1), visually and auditorily inspect each quadrilateral reflective surface unit (2), identify the damaged quadrilateral reflective surface unit (2), and make a record; Step 3. Perform reconstruction work on the clamp, and reconstruct and maintain the damaged clamp (3) without affecting the telescope observation and the existing structural form. Perform reconstruction and design of a new clamp (7) based on the clamp reconstruction test and simulation calculation, and use the new clamp (7) to replace the damaged clamp (3), so that the door frame of the new clamp (7) will not interfere with the 2# connection mechanism of the quadrilateral reflection surface unit (2); Step 4. Construction quality inspection. After the modification of the clamp is completed, multiple teams will conduct cross-checks to ensure that all parts are firmly installed and the high-strength screw torque of the new clamp (7) meets the original design requirements. During the telescope's observation stop period, the high-strength screw torque of the new clamp (7) is measured and checked again. During the construction process, the construction status of the installation of the new clamp (7) is recorded to ensure that each installation of the new clamp (7) is traceable.

2. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 1, characterized in that: The method further comprises step 5, wherein after the new clamp (7) meets the requirements after being inspected for use, the new clamp (7) is used to gradually replace the original clamp.

3. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 1, characterized in that: During telescope observations, taking into account the normal displacement range of the reflecting surface and the electromagnetic compatibility requirements of the telescope equipment, the equipment, tooling, reflecting surface units being maintained and temporary support structures used in on-site construction must not interfere with, interfere with or collide with existing telescope facilities. Maintenance and construction should be carried out using machinery without electronic equipment to avoid affecting telescope observations.

4. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 1, characterized in that: In step 3, the telescope observation plan is received and published in advance every day, and the construction location is adjusted in time to ensure the construction period.

5. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 1, characterized in that: In step 3, only one clamp (3) of the quadrilateral reflective surface unit (2) can be removed at a time, and the other clamp (3) is retained to ensure the force balance of the quadrilateral reflective surface unit (2) on the cable net, to ensure that the observation is not affected and the quadrilateral reflective surface unit (2) is intact and does not fall off.

6. A method for inspection and maintenance of a reflective surface and ring beam connection device according to claim 5, characterized in that: The construction process of hoop removal is as follows: Preparation of construction machinery → Installation of construction platform → Hanging of anti-fall net → Construction workers mark the clamps → Hang and fix the clamps with hand winches → Use extended wrenches to remove the original high-strength bolts → Lift the clamps into the ring beam horseway and transport them to the roadside with a flatbed truck → Use a car to transport the clamps to the designated factory for processing → Remove the construction platform.

7. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 6, characterized in that: The installation process of the clamp is as follows: Preparation of construction machinery → Installation of construction platform → Hanging of anti-fall net → Transporting the modified new clamp to the construction site → Checking the serial number and hoisting the new clamp to the installation site by hand hoist → Hoisting the 2# end of the quadrilateral reflective surface unit by hand hoist → Cleaning the clamp installation site → Determine the installation site and installation angle → Locking the new clamp with high-strength bolts → Installing the stainless steel plate of the tray → Installing and adjusting the door frame and lens → Anti-corrosion of high-strength bolts → Overall surface paint treatment.

8. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 1, characterized in that: During the construction of the hoop reconstruction, timely maintenance is performed on the rusted parts of the edge cable heads and the steel structure inside the ring beam (1).

9. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 8, characterized in that: A new clamp (7) is obtained by enlarging the door frame size of the original clamp, wherein the new clamp (7) comprises a clamp body (8), an extended steel plate (10) is provided on the top of the pallet steel plate (9) of the clamp body (8), the width of the extended steel plate (10) is greater than the width of the pallet steel plate (9), a stainless steel plate (11) is provided on the top of the extended steel plate (10), L-shaped support rods (12) are provided on both sides of the stainless steel plate (11), the upper ends of the support rods (12) on both sides are connected to a cross rod (13), the two ends of the cross rod (13) are provided with vertical rods (14), and an observation mirror (15) is connected between the vertical rods (14) at both ends, the width of the extended steel plate (10) is not less than 400 mm, and the height is not less than 300 mm, the width between the support rods (12) on both sides is not less than 350 mm, and the height of the cross rod (13) is not less than 260 mm.

10. The inspection and maintenance method of the reflective surface and ring beam connection device according to claim 9, characterized in that: The tray steel plate (9) is welded to the extended steel plate (10), and a first threaded section (16) is provided at the lower end of the support rod (12), and the first threaded section (16) passes through the stainless steel plate (11) and the extended steel plate (10) in sequence downward and is locked by a double nut (17), and a cotter pin (18) is provided at the first threaded section (16) below the double nut (17), and a second threaded section (19) is provided at the upper end of the support rod (12), and threaded holes (20) matching the second threaded section (19) are provided at both ends of the cross bar (13), and the second threaded section (19) is provided with a tightening nut (21), and the vertical rod (14) is provided with a first nut (22), and second nuts (23) are provided on both sides of the observation mirror (15), and the first nut (22) and the second nut (23) are connected by a first bolt (24), and the stainless steel plate (11) and the extended steel plate (10) are connected by a second bolt (25).

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