High and large space insulation shielding construction method

Abstract

The invention discloses a tall and large space insulation shielding construction method which comprises the following steps: S1, erecting steel latticed columns and steel trusses at preset positions to form an insulation shielding space frame body, and then performing ground insulation layer and shielding layer construction in a ground area of the insulation shielding space frame body; s2, wall surface insulation and wall surface shielding layer construction are carried out on the wall surface area of the insulation shielding space frame body; s3, top surface insulation and top surface shielding layer construction are carried out on the top surface area of the insulation shielding space frame body; s4, shielding construction treatment is conducted on door and window hole joints in the wall face area and the top face area; according to the high and large space insulation shielding construction method provided by the invention, an existing electromagnetic insulation shielding shell construction method is improved, so that when the high and large space electromagnetic shielding environment is constructed, the shielding effectiveness requirement of the electromagnetic insulation shielding shell can be met, meanwhile, the construction efficiency can be improved, and the operation intensity of constructors can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a high-space insulation shielding construction method. Background Art

[0002] The electromagnetic shielding environment of the high-voltage test hall is a necessary testing environment for the insulation condition diagnosis of high-voltage electrical equipment. It is widely used in the production and use of power transformers, insulators, switches, and high-voltage bushing tests. The shielding principle of the high-voltage test hall is to weld metal plates into a closed shell and connect it to the earth. The surface potential of the shell is equal everywhere, and the electromagnetic wave signals on the inside and outside of the shell cannot pass through the shielding shell and will be directly introduced into the earth. However, how to completely build such an electromagnetic shielding environment also brings many challenges to construction technicians during on-site construction.

[0003] In the construction of traditional buildings, the insulating shielding shell is usually made of single-layer steel plates, which are manually welded piece by piece on the template keel frame on the ground, wall and ceiling to form a full weld. However, due to the large amount of manual welding work in actual construction, this method will inevitably have weak points such as gaps and holes, which can easily cause the shielding efficiency to fail to meet the standards. Its inspection and rework efficiency is low, and it will also bring additional safety hazards to subsequent use. In actual construction, due to the increasing size of such halls, it is difficult to ensure the formation of a perfect continuous conductive layer when welding steel plates, and the openings of doors, windows, water and electricity pipes will seriously reduce the shielding efficiency; at the same time, if the wall and ceiling still use the construction method of manually welding small modules piece by piece at high altitude after the keel is erected, the operators will be under greater labor intensity, resulting in low construction efficiency and affecting the overall construction cycle progress. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a large-space insulation shielding construction method. By improving the existing electromagnetic insulation shielding shell construction method, it can meet the requirements of the shielding effectiveness of the electromagnetic insulation shielding shell when constructing an electromagnetic shielding environment in a large space. At the same time, it can also improve the construction efficiency and reduce the work intensity of construction personnel.

[0005] The invention provides a high-space insulation shielding construction method, comprising the following steps:

[0006] S1. The steel lattice columns and steel trusses are erected at a preset position to form an insulating shielding space frame, and then the ground insulation layer and shielding layer are constructed in the ground area of ​​the insulating shielding space frame;

[0007] S2. A wall shielding purlin skeleton is set up between adjacent steel lattice columns in the wall area of ​​the insulating shielding space frame, and insulation treatment is performed between the wall shielding purlin skeleton and the steel lattice column. Then, a wall shielding plate is laid on the wall shielding purlin skeleton to complete the wall shielding construction, wherein the wall shielding plate is processed and spliced ​​on-site with a single plate and then hoisted and installed as a whole;

[0008] S3. A top shielding purlin skeleton is set up between adjacent steel trusses in the top surface area of ​​the insulating shielding space frame, and the top shielding purlin skeleton and the steel truss are insulated, and then a top shielding plate is laid on the top shielding purlin skeleton to complete the top shielding construction, wherein the top shielding plate is processed and spliced ​​on-site with a single plate and then hoisted and installed as a whole;

[0009] S4. Perform shielding construction on the door and window opening nodes in the wall area and the ceiling area respectively.

[0010] Further, in step S1, the construction of the ground insulation layer and the shielding layer includes: using PP insulation boards to weld in the ground area of ​​the insulating shielding space frame to form a ground insulation layer → setting a concrete protective layer above the ground insulation layer → using galvanized steel plates to weld above the concrete protective layer to form a ground shielding layer → setting a concrete floor above the ground shielding layer.

[0011] Furthermore, a ground-to-wall transition structure is provided between the ground shielding layer and the wall shielding plate, and the ground-to-wall transition structure is used to achieve the connection between the ground shielding layer and the wall shielding layer.

[0012] Further, in step S2, the wall shielding purlin skeleton includes installation nodes evenly spaced in the height direction of the steel lattice columns, the wall shielding purlins are arranged between the installation nodes of adjacent steel lattice columns at the same height position, and the wall shielding purlins are used to install wall shielding plates.

[0013] Furthermore, the cross-section of the wall shielding purlin is a C-shaped structure, and the installation node includes an upper clamping component respectively arranged at the upper end of the wall shielding purlin and a lower clamping component respectively arranged at the lower end of the wall shielding purlin, and the upper clamping component and the lower clamping component are respectively fixedly connected to the upper end and the lower end of the wall shielding purlin and are used to clamp the wall shielding purlin.

[0014] Furthermore, the upper clamping assembly includes a flange plate with an inverted "T"-shaped cross-section, the bottom horizontal plate of the flange plate is used to connect with the upper end of the wall shielding purlin, and the flange plate is fixedly connected to the steel lattice column at the side wall facing the steel lattice column; an insulating pad is arranged between the bottom horizontal plate of the flange plate and the upper end of the wall shielding purlin.

[0015] Further, in step S3, the top surface shielding purlin skeleton includes connection nodes spaced apart at the lower chord of the steel truss, the top surface shielding purlin is arranged between adjacent connection nodes of the steel truss located on the same horizontal straight line, and the top surface shielding purlin is used to install the wall shielding panel.

[0016] Furthermore, the connection node includes a lower support plate arranged below the lower chord ball of the steel truss and insulated from the lower chord ball of the steel truss, the top surface shielding purlin is arranged between the lower support plate and the lower chord ball of the steel truss, and insulating pads are respectively arranged between the upper surface of the top surface shielding purlin and the lower chord ball of the steel truss and on the lower surface of the lower support plate.

[0017] Further, in step S4, the door and window opening node processing includes waveguide window node processing, shielding observation window node processing, shielding small door processing and shielding processing of power cabinets, operating boxes, switch cabinets, etc. embedded in shielding interlayers.

[0018] Furthermore, after the construction of the ground insulation layer is completed, after the insulation treatment is done between the wall shielding purlin skeleton and the steel lattice column, and after the insulation treatment is done between the top shielding purlin skeleton and the steel truss, insulation testing and shielding effectiveness testing are required.

[0019] The present invention has the following beneficial effects:

[0020] (1) The present invention realizes continuous, stable and efficient welding operation by adopting mechanical automatic welding to weld the ground insulation board with the wall and top shielding metal plates, thereby improving welding quality, reducing manual welding operations, reducing the labor intensity of operators, and improving the safety and reliability of welding work;

[0021] (2) The present invention adopts the installation method of hoisting the shielding shell on the wall and the top surface in a large module after welding. Compared with the conventional construction method of manually welding small modules one by one at high altitude after setting up the keel, it reduces a lot of high-altitude operations and manual welding work, and has higher economy and safety;

[0022] (3) The present invention performs a further insulation treatment on the door and window openings in the insulating shielding shell, which has higher shielding efficiency, is more reliable, and is safer than the traditional process of not insulating the door and window openings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0024] Figure 1 It is a schematic diagram of the structure of the ground insulation layer in the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the ground and wall shielding layers in the present invention;

[0026] Figure 3 is a schematic diagram of the installation of the wall shielding plate in the present invention;

[0027] Figure 4 It is a schematic diagram of the installation of the top shielding plate in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the installation node in the present invention;

[0029] Figure 6 for Figure 5 AA section view;

[0030] Figure 7 It is a schematic diagram of the structure of the connection node in the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the waveguide window in the present invention;

[0032] Fig. 9 for Figure 8 BB cross-sectional view;

[0033] Explanation of the reference numerals: 1-steel truss; 2-steel lattice column; 3-pulley; 4-winch; 5-wall shielding plate; 6-lifting tooling; 7-top shielding plate; 8-pull rope; 9-ground insulation layer; 10-ground shielding layer; 11-concrete floor; 12-ground copper plate; 13-ground-wall transition structure; 14-punching silencer plate; 15-wall shielding purlin; 16-upper clamping assembly; 17-lower clamping assembly; 18-insulating pad; 19-first insulating sleeve; 20-connecting bolt; 21-lower chord ball; 22-support plate; 23-adjusting plate; 24-second insulating sleeve; 25-waveguide window; 26-flexible connector; 27-top shielding purlin. DETAILED DESCRIPTION

[0034] As shown in the figure, a high-space insulation shielding construction method provided by the present invention comprises the following steps:

[0035] S1. The steel lattice column 2 and the steel truss 1 are set up in a preset position and form an insulating shielding space frame, and then the ground insulation layer 9 and the shielding layer are constructed in the ground area of ​​the insulating shielding space frame;

[0036] S2. A wall shielding purlin 15 skeleton is set up between adjacent steel lattice columns 2 in the wall area of ​​the insulating shielding space frame, and the wall shielding purlin 15 skeleton and the steel lattice column 2 are insulated, and then a wall shielding plate 5 is laid on the wall shielding purlin 15 skeleton to complete the wall shielding construction, wherein the wall shielding plate 5 is hoisted and installed as a whole after single-plate on-site processing and splicing;

[0037] S3. A top shielding purlin 27 skeleton is set up between adjacent steel trusses 1 in the top surface area of ​​the insulating shielding space frame, and the top shielding purlin 27 skeleton is insulated from the steel truss 1, and then a top shielding plate 7 is laid on the top shielding purlin 27 skeleton to complete the top shielding construction, wherein the top shielding plate 7 is hoisted and installed as a whole after single-plate on-site processing and splicing;

[0038] S4. Perform shielding construction on the door and window opening nodes in the wall area and the ceiling area respectively.

[0039] Among them, this solution uses mechanical automatic welding to achieve continuous, stable and efficient welding operations, improve welding quality, reduce manual welding operations, reduce the labor intensity of operators, and improve the safety and reliability of welding work; and by using the shielding shells on the wall and the top surface to weld large modules and then hoist them as a whole, compared with the conventional construction method of manually welding small modules at high altitude after setting up the keel, a large amount of high-altitude operations and manual welding work is reduced, and it has higher economy and safety; this solution also deepens the insulation treatment of the door and window openings in the insulating shielding shell, and compared with the traditional process of uninsulated door and window openings, the shielding efficiency is higher, more reliable, and safer.

[0040] In this embodiment, in step S1, the construction of the ground insulation layer 9 and the shielding layer includes: using PP insulation board to weld in the ground area of ​​the insulation shielding space frame to form the ground insulation layer 9 → setting a concrete protective layer on the ground insulation layer 9 → using galvanized steel plate to weld on the concrete protective layer to form a ground shielding layer 10 → setting a concrete floor 11 on the ground shielding layer 10; combined with Figure 1 and Figure 2As shown, when the ground insulation layer 9 is constructed, it is necessary to separate the shielding layer of the entire hall from the ground. In order to ensure the insulation performance, a 10mm thick PP insulation board is pre-chamfered at 45° and then welded and assembled; when the ground is insulated, an automatic welding machine for PP insulation board is used, and a hot air welding plastic gun is added to the front section of the welding machine to preheat the PP insulation board, so that the solder of the PP insulation board welding machine and the PP insulation board are completely welded together, and repeated three times. Finally, the PP insulation board is 10cm higher than the ground by ±0.00 on all sides. After welding, a giant PP "plastic water basin" is formed within the test hall; then carefully check the weld to ensure that there are no holes in the weld, then slowly pour water into the PP "plastic water basin" to keep water storage for 24 hours, and then test the insulation resistance between the PP insulation board and the ground. Only after confirming that the insulation resistance is qualified can the next process be constructed; and in order to prevent the shielding board construction from damaging the insulation layer, a 50mm thick C25 concrete protective layer needs to be poured on the PP board after the insulation resistance test is qualified. The ground shielding layer 10 uses 1.2mm thick galvanized steel plate, which is rolled and laid flat, overlapped with each other, with an overlap width of not less than 10mm. The overlap seams are fully welded with carbon dioxide shielded welding and anti-corrosion treatment is performed after welding. The ground-wall transition structure 13 is used to connect the shielding wall surface all around.

[0041] In this embodiment, combined with Figure 2 As shown, a ground-to-wall transition structure 13 is provided between the ground shielding layer 10 and the wall shielding plate 5, and the ground-to-wall transition structure 13 is mainly used to realize the connection between the ground shielding layer 10 and the wall shielding plate 5, so as to ensure the shielding continuity at the connection between the ground shielding layer 10 and the wall shielding layer, and ensure the overall shielding effect. At the same time, a punched silencer plate 1414 is also provided outside the wall shielding plate 5, and the ground-to-wall transition structure 13 is fixed to the ground by expansion bolts to avoid its displacement and deformation.

[0042] In this embodiment, in step S2, the wall shielding purlin 15 skeleton includes installation nodes evenly spaced in the height direction of the steel lattice column 2, the wall shielding purlin 15 is arranged between the installation nodes of adjacent steel lattice columns 2 at the same height position, and the wall shielding purlin 15 is used to install the wall shielding plate 5; wherein the installation node mainly relies on the structure of the steel lattice column 2 itself and the wall shielding purlin 15 is installed at the installation node, and the wall shielding plate 5 is fully laid on the supporting frame formed by the wall shielding purlin 15 and the steel lattice column 2, and finally the wall insulation construction is completed, and the wall insulation layer is mainly realized by the insulation treatment of the connection surface between the wall shielding purlin 15 and the flange plate; after each wall shielding purlin 15 is installed, the insulation resistance between the shielding purlin and the steel lattice column 2 needs to be tested with an insulation megger, and if conduction is found, the cause should be carefully found out and eliminated.

[0043] In this embodiment, the cross-section of the wall shielding purlin 15 is a C-shaped structure, and the installation node includes an upper clamping component 16 respectively arranged at the upper end of the wall shielding purlin 15 and a lower clamping component 17 respectively arranged at the lower end of the wall shielding purlin 15, and the upper clamping component 16 and the lower clamping component 17 are respectively fixedly connected to the upper end and the lower end of the wall shielding purlin 15 and are used to clamp the wall shielding purlin 15; Figure 5 As shown, at least one group of upper clamping components 16 and lower clamping groups are provided according to the specific installation position, and two groups of installation nodes at the installation nodes of the middle steel lattice columns 2 are provided to cooperate with the installation nodes at the same height position as the adjacent steel lattice columns 2 to install the wall shielding purlins 15; wherein the wall shielding purlins 15 are made of C-shaped steel.

[0044] In this embodiment, the upper clamping assembly 16 includes a flange plate with an inverted "T"-shaped cross section, the bottom horizontal plate of the flange plate is used to connect with the upper end of the wall shielding purlin 15, and the flange plate is fixedly connected to the steel lattice column 2 at the side wall facing the steel lattice column 2; an insulating pad 18 is provided between the bottom horizontal plate of the flange plate and the upper end of the wall shielding purlin 15; Figure 5 and Figure 6 As shown, the flange plate is made of steel plate into a "T"-shaped structure. At the same time, in order to prevent stress deformation during welding, the flange plate should be welded to the preset position on the steel lattice column 2 before the steel lattice column 2 is hoisted and anti-corrosion and rust-proof treatment should be done; wherein the insulating pad 18 is an epoxy resin glass fiber board, and the insulation between the wall shielding purlin 15 and the flange plate adopts the method of installing a 10mm thick epoxy resin glass fiber board between the wall shielding purlin 15 and the flange plate to achieve the insulation function; combined with Figure 5 and Figure 6 As shown, the connection and fixation between the flange plate and the wall shielding purlin 15 is achieved by connecting bolts 20 , and in order to ensure the insulation between the flange plate and the wall shielding purlin 15 , a first insulating sleeve 19 is provided and the connecting bolts 20 are arranged in the first insulating sleeve 19 .

[0045] Combination Figure 3As shown, during the construction of the wall shielding layer, the wall shielding plate 5 is made of 0.6mm thick aluminum-zinc color-coated plate for production and installation. After the aluminum-zinc steel plate is processed into a module type on site, it is spliced ​​on the ground so that several shielding plates are spliced ​​into a large unit, wherein the spliced ​​seams are connected by spot welding (resistance welding) with an automatic welding machine, and then a hoisting tool 6 is made on the spliced ​​large wall shielding plate 5 unit for hoisting. Each cross intersection between the wall shielding plate 5 and the hoisting tool 6 is connected with 4# angle steel. The contact point between the 4# angle steel and the tool is welded, and the length of the weld should not be less than half of the size of the tool square tube. The contact surface between the 4# angle steel and the wall shielding plate 5 is connected with strong self-tapping screws. After the connection is completed, the wall shielding plate 5 should be cleaned. The debris on the wall can be prevented from slipping and injuring people during lifting; the unit of the wall shielding plate 5 is lifted by 3-6 3-ton winches 4. The specific number of winches 4 should be determined according to the size and weight of the shielding plate unit. The fixation of the winch 4 and the pulley 3 group should be firm and reliable, the direction of the wire rope should be consistent with the lifting direction of the shielding plate, the arrangement of the steering single pulley 3 should be reasonable, and the movement of the wire rope should be smooth; after the wall shielding plate 5 unit is lifted, the position and verticality of the shielding plate unit should be carefully checked. Only fix and splice it when there is no abnormality. After splicing, the intersection of the joints of each shielding plate and the purlin needs to be fixed with 4# angle steel. The joints between the shielding plate units are fully welded with carbon dioxide shielded welding, and the welds are painted with anti-rust paint for anti-rust treatment.

[0046] In this embodiment, in step S3, the top surface shielding purlin 27 skeleton includes connection nodes arranged at intervals at the lower chord ball 21 of the steel truss 1, the top surface shielding purlin 27 is arranged between adjacent connection nodes of the steel truss 1 located on the same horizontal straight line, and the top surface shielding purlin 27 is used to install the wall shielding plate 5; the connection node includes a lower support plate 22 arranged below the lower chord ball 21 of the steel truss 1 and insulated and connected to the lower chord ball 21 of the steel truss 1, the top surface shielding purlin 27 is arranged between the lower support plate 22 and the lower chord ball 21 of the steel truss 1, and insulating pads 18 are respectively arranged between the upper surface of the top surface shielding purlin 27 and the lower chord ball 21 of the steel truss 1 and on the lower surface of the lower support plate 22; Figure 7 As shown, the top surface insulation layer and the wall surface insulation layer have the same insulation principle, that is, an insulation gasket is placed between the support plate 22 and the top surface shielding purlin 27, and is fixed with a second insulation sleeve 24 and a connecting bolt 20, so that the top surface shielding purlin 27 is insulated from the support plate 22; the top surface shielding purlin 27 has the same structure as the wall surface shielding purlin 15. Figure 4 As shown, the installation method of the top shielding layer is basically the same as that of the wall shielding layer. It is processed into large-area modules on site and then hoisted and installed. The installation points are the same as those of the wall shielding layer.

[0047] In this embodiment, in step S4, the node processing of the door and window openings includes the node processing of the waveguide window 25, the node processing of the shielding observation window, the shielding small door processing and the shielding processing of the power cabinet, the operation box, the switch cabinet, etc. embedded in the shielding interlayer; due to the seamless assembly characteristics of the shielding plate and the actual project situation, no holes are reserved when the shielding plate is installed, such as the holes of the air inlet, the return air outlet, the light box, and the shielding small door. The holes are positioned and opened after the shielding plate is installed; steel frames are added around all the opening positions, door covers are decorated around the door frame, and the shielding plate and the steel frame are fully welded using carbon dioxide shielded welding.

[0048] The shielding treatment of the ventilation openings in the high-voltage test hall adopts the form of waveguide windows 25 to absorb the electromagnetic signals propagating at the air outlets. Figure 8 and Fig. 9 As shown, this scheme adds a soft connector 26 (made of PP board insulation) at the connection point based on the welding of the waveguide window 25 and the shielding layer to prevent the shielding layer from being turned on at the position of the waveguide window 25, destroying the insulation effect, reducing the shielding efficiency, and eliminating the abnormal contact sound at the vent. The shielding observation window must play both electromagnetic shielding and test observation. Its structure is a double-layer 5mm thick tempered glass with a 20-mesh stainless steel shielding net sandwiched inside. A 50mm wide shielding net is reserved around each shielding window, crimped on the surrounding window frames, and fixed with sealant to ensure electrical continuity. The small doors connected to the shielding hall are all blade-type shielding doors, with a hinge drive, a double-point locking mechanism, and two layers of electromagnetic sealing springs. The springs are made of beryllium bronze material and are specially treated to achieve good elasticity and wear resistance. The shielding spring is detachable, each section is 198mm long, and it is easy to replace if it is partially damaged, without the need for professional maintenance; the small door is a manual push-pull type, and the opening angle is not less than 170°. The five surfaces of the shielding shell of the power cabinet, operation box, and switch cabinet embedded in the shielding interlayer are made of 1.2mm thick galvanized sheet metal, which is sheared and bent to the specified size. The corners and joints are fully welded with carbon dioxide shielded welding, and the parts in contact with the shielding plate are fully welded with carbon dioxide shielded welding. Anti-rust paint is applied to the front and back of the weld for rust prevention; the decorative strips are made of 1.2mm thick galvanized sheet metal, which is cut and bent, and laid around the door of the shielding shell, and spot-welded to the shielding plate; the wires in the control cabinet that enter and exit the hall from the outside need to be equipped with filters, and the wires leading from the control cabinet to the hall should be arranged in galvanized pipes, and the joints of the galvanized pipes should be fully welded or connected with twisted wires, and the parts passing through the shielding layer should be fully welded to the shielding body.

[0049] In this embodiment, insulation testing and shielding effectiveness testing are required after the construction of the ground insulation layer 9 is completed, after the insulation treatment is done between the wall shielding purlin 15 frame and the steel lattice column 2, and after the insulation treatment is done between the top shielding purlin 27 frame and the steel truss 1; by performing insulation and shielding tests at each construction stage, the occurrence of subsequent repairs can be reduced and the shielding effectiveness can be guaranteed.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high and large space insulation shielding construction method, characterized in that: The following steps are involved: S1. The steel lattice columns and steel trusses are erected at a preset position to form an insulating shielding space frame, and then the ground insulation layer and shielding layer are constructed in the ground area of ​​the insulating shielding space frame; S2. A wall shielding purlin skeleton is set up between adjacent steel lattice columns in the wall area of ​​the insulating shielding space frame, and insulation treatment is performed between the wall shielding purlin skeleton and the steel lattice column. Then, a wall shielding plate is laid on the wall shielding purlin skeleton to complete the wall shielding construction, wherein the wall shielding plate is processed and spliced ​​on-site with a single plate and then hoisted and installed as a whole; S3. A top shielding purlin skeleton is set up between adjacent steel trusses in the top surface area of ​​the insulating shielding space frame, and the top shielding purlin skeleton and the steel truss are insulated, and then a top shielding plate is laid on the top shielding purlin skeleton to complete the top shielding construction, wherein the top shielding plate is processed and spliced ​​on-site with a single plate and then hoisted and installed as a whole; S4. Perform shielding construction on the door and window opening nodes in the wall area and the ceiling area respectively.

2. The high and large space insulation shielding construction method according to claim 1 is characterized in that: In step S1, the construction of the ground insulation layer and the shielding layer includes: using PP insulation boards to weld in the ground area of ​​the insulating shielding space frame to form a ground insulation layer → setting a concrete protective layer above the ground insulation layer → using galvanized steel plates to weld above the concrete protective layer to form a ground shielding layer → setting a concrete floor above the ground shielding layer.

3. The high and large space insulation shielding construction method according to claim 2 is characterized in that: A ground-to-wall transition structure is provided between the ground shielding layer and the wall shielding plate, and the ground-to-wall transition structure is used to realize the connection between the ground shielding layer and the wall shielding layer.

4. The high and large space insulation shielding construction method according to claim 1 is characterized in that: In step S2, the wall shielding purlin skeleton includes installation nodes evenly spaced in the height direction of the steel lattice columns, the wall shielding purlins are arranged between the installation nodes of adjacent steel lattice columns at the same height position, and the wall shielding purlins are used to install wall shielding plates.

5. The high and large space insulation shielding construction method according to claim 4 is characterized in that: The cross-section of the wall shielding purlin is a C-shaped structure, and the installation node includes an upper clamping component respectively arranged at the upper end of the wall shielding purlin and a lower clamping component respectively arranged at the lower end of the wall shielding purlin, and the upper clamping component and the lower clamping component are respectively fixedly connected to the upper end and the lower end of the wall shielding purlin and are used to clamp the wall shielding purlin.

6. The high and large space insulation shielding construction method according to claim 5 is characterized in that: The upper clamping assembly includes a flange plate with an inverted "T"-shaped cross-section, the bottom horizontal plate of the flange plate is used to connect with the upper end of the wall shielding purlin, and the flange plate is fixedly connected to the steel lattice column at the side wall facing the steel lattice column; an insulating pad is arranged between the bottom horizontal plate of the flange plate and the upper end of the wall shielding purlin.

7. The high and large space insulation shielding construction method according to claim 1 is characterized in that: In step S3, the top shielding purlin skeleton includes connection nodes spaced apart at the lower chord of the steel truss, the top shielding purlin is arranged between adjacent connection nodes of the steel truss located on the same horizontal straight line, and the top shielding purlin is used to install the wall shielding plate.

8. The high and large space insulation shielding construction method according to claim 7 is characterized in that: The connection node includes a lower support plate arranged below the lower chord ball of the steel truss and insulated from the lower chord ball of the steel truss; the top surface shielding purlin is arranged between the lower support plate and the lower chord ball of the steel truss; insulating pads are respectively arranged between the upper surface of the top surface shielding purlin and the lower chord ball of the steel truss and on the lower surface of the lower support plate.

9. The high and large space insulation shielding construction method according to claim 2 is characterized in that: In step S4, the door and window opening node processing includes waveguide window node processing, shielding observation window node processing, shielding small door processing and shielding processing of power cabinets, operating boxes, switch cabinets, etc. embedded in shielding interlayers.

10. The high and large space insulation shielding construction method according to claim 1 is characterized in that: After the construction of the ground insulation layer is completed, after the insulation treatment is done between the wall shielding purlin frame and the steel lattice column, and after the insulation treatment is done between the top shielding purlin frame and the steel truss, insulation testing and shielding effectiveness testing are required.

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