Reinforcing structure of floor of ultra-high voltage electromagnetic shielding room and construction method thereof

Abstract

The application discloses a kind of extra-high voltage electromagnetic shield room floor's steel bar structure and its construction method, comprising: shielding steel plate;Bottom steel mesh, including multiple first mesh units, first mesh unit is laid on multiple rib plates of shielding steel plate, multiple first mesh units are spaced along the width direction of rib plate, and first longitudinal joint is formed between adjacent two first mesh units;Surface layer steel mesh, including multiple second mesh units, multiple second mesh units are arranged above each first mesh unit, transverse joint is formed between adjacent two second mesh units, the position corresponding to two second mesh units above adjacent two first mesh units forms second longitudinal joint, second longitudinal joint is directly above first longitudinal joint, and the end of the steel bar of first mesh unit and second mesh unit at first longitudinal joint, second longitudinal joint and transverse joint is bent to form hook head portion towards respective interior, and second mesh unit is erected on first mesh unit by stirrup bar.The application solves the problem that the steel mesh of the floor of extra-high voltage electromagnetic shield room is easy to damage the shielding effectiveness of shield room.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a reinforced concrete structure for the floor of an ultra-high voltage electromagnetic shielding room and its construction method. Background Technology

[0002] Electromagnetic shielding rooms need to possess a certain level of shielding effectiveness. Electromagnetic shielding is achieved by enclosing the shielding room with a shielding body, forming a sealed space. The shielding body is mostly made of metal. For ultra-high voltage electromagnetic shielding rooms, the floor also needs to have a certain load-bearing capacity. Therefore, a steel mesh is generally laid on the floor. However, during the construction of the steel mesh, there is a possibility of compromising the shielding effectiveness of the room. Furthermore, if the steel mesh is not properly handled, it may cause a "point discharge" phenomenon on the ground during ultra-high voltage testing, affecting the testing process. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, a steel reinforcement structure for the floor of an ultra-high voltage electromagnetic shielding room and its construction method are provided to solve the problem that the steel reinforcement mesh of the floor of the ultra-high voltage electromagnetic shielding room can easily damage the shielding effectiveness of the room.

[0004] To achieve the above objectives, a reinforced concrete structure for the floor of an ultra-high voltage electromagnetic shielding room is provided, comprising:

[0005] A shielding steel plate, wherein multiple ribs are formed on the upper surface of the shielding steel plate;

[0006] The bottom layer of steel mesh includes multiple first mesh units, which are laid on the multiple ribs and spot-welded to the ribs. The first mesh units are arranged along the length direction of the ribs, and the multiple first mesh units are spaced apart along the width direction of the ribs. A first longitudinal seam is formed between two adjacent first mesh units.

[0007] The surface steel mesh includes multiple second mesh units. Multiple second mesh units are arranged above each first mesh unit. The multiple second mesh units are spaced apart along the length of the first mesh unit. A transverse seam is formed between two adjacent second mesh units. A second longitudinal seam is formed between two second mesh units located above two adjacent first mesh units. The second longitudinal seam is directly above the first longitudinal seam. The ends of the steel bars of the first and second mesh units at the first longitudinal seam, the second longitudinal seam, and the transverse seam are bent inward to form hook heads. The second mesh units are supported on the first mesh units by stirrups.

[0008] Furthermore, the first mesh unit includes multiple continuous ribs and multiple first segmented ribs. The continuous ribs are arranged along the length of the rib plate, and the first segmented ribs are arranged along the width of the rib plate. The first segmented ribs are arranged to intersect with the continuous ribs, and the ends of the continuous ribs and the segmented ribs are formed with hook heads.

[0009] Furthermore, the second mesh unit includes multiple second segmented bars and multiple third segmented bars. The second segmented bars are arranged along the length direction of the continuous bar, and the second segmented bars are arranged to intersect with the third segmented bars. The second segmented bars are welded to the stirrup bars.

[0010] Furthermore, there are multiple trestles, and the multiple trestles are arranged in a quincunx pattern.

[0011] Furthermore, the ends of the reinforcing bars are bent downwards and toward their respective interiors to form the hook heads.

[0012] Furthermore, the ends of the reinforcing bars are bent downwards and inwards by 180° to form the hook heads.

[0013] This invention provides a construction method for the reinforced concrete structure of the floor of an ultra-high voltage electromagnetic shielding room, comprising the following steps:

[0014] Install shielding steel plates at the construction site of the floor slab;

[0015] Multiple first mesh units of the bottom steel mesh are laid on the multiple ribs, such that the first mesh units are arranged along the length direction of the ribs, and the multiple first mesh units are spaced apart along the width direction of the ribs, with a first longitudinal seam formed between two adjacent first mesh units.

[0016] The first mesh unit is spot-welded to the rib plate;

[0017] Multiple second mesh units of the surface steel mesh are erected on the first mesh unit using stirrups, such that multiple second mesh units are arranged above each first mesh unit. The multiple second mesh units are spaced apart along the length of the first mesh unit, and a transverse seam is formed between two adjacent second mesh units. The second longitudinal seam formed between two adjacent first mesh units is directly above the first longitudinal seam.

[0018] The beneficial effects of this invention are as follows: In the construction of the UHV electromagnetic shielding room floor reinforcement structure, the bottom layer steel frame mesh and the surface layer steel mesh are directly laid on the ribs of the shielding steel plate. The connection method within the floor reinforcement mesh is changed to spot welding, achieving equipotential bonding through the shielding steel plate, thus enhancing the shielding effectiveness of the ground to a certain extent. At the pre-set construction joints and dummy joints, certain intervals of cutting positions for construction joints and dummy joints are reserved within the floor reinforcement mesh (corresponding to the first longitudinal joint, second longitudinal joint, and transverse joint positions), ensuring that cutting the concrete avoids the reinforcement positions. Hook heads are provided at the ends of the continuous and segmented reinforcement bars. During installation, the hook heads face downwards to prevent "point discharge" phenomena from occurring at the cut ends of the reinforcement bars, which could damage the shielding effectiveness of the shielding room. Attached Figure Description

[0019] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the steel reinforcement structure of the floor of the ultra-high voltage electromagnetic shielding room according to an embodiment of the present invention.

[0021] Figure 2 for Figure 1 A magnified view of the area at point W.

[0022] Figure 3 This is a front view of the steel reinforcement structure of the floor of the ultra-high voltage electromagnetic shielding room according to an embodiment of the present invention.

[0023] Figure 4 This is a side view of the steel reinforcement structure of the floor of the ultra-high voltage electromagnetic shielding room according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the structure of the shielding steel plate according to an embodiment of the present invention.

[0025] Figure 6 for Figure 5 A magnified view of the area at point X.

[0026] Figure 7 This is a schematic diagram of the structure of the bottom steel mesh in an embodiment of the present invention.

[0027] Figure 8 for Figure 7 A magnified view of the area at point Y.

[0028] Figure 9 This is a schematic diagram of the surface steel mesh structure according to an embodiment of the present invention.

[0029] Figure 10 for Figure 9A magnified view of the area at point Z. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Reference Figures 1 to 10 As shown, the present invention provides a steel reinforcement structure for the floor of an ultra-high voltage electromagnetic shielding room, comprising: a shielding steel plate 1, a bottom layer steel mesh 2, a top layer steel mesh 3, and stirrups 4.

[0033] In this invention, after the concrete is poured, the steel reinforcement structure of the ultra-high voltage electromagnetic shielding room floor is encased in the concrete to solidify and form the ultra-high voltage electromagnetic shielding room floor.

[0034] The shielding steel plate 1 comprises multiple steel plate units. Each steel plate unit is elongated. (See reference...) Figure 1 and Figure 2 As shown, a plurality of ribs 11 are formed on the upper surface of the shielding steel plate 1. In this embodiment, ribs are formed by flipping up on opposite sides of the steel plate unit. Flanges are formed on the upper part of the ribs.

[0035] The bottom layer of reinforcing mesh 2 includes multiple first mesh units A. First mesh units A are laid on multiple ribs 11. First mesh units A are spot-welded to the ribs 11. First mesh units A are arranged along the length of the ribs 11. Multiple first mesh units A are spaced apart along the width of the ribs 11. A first longitudinal joint a is formed between two adjacent first mesh units A.

[0036] The surface steel mesh 3 comprises multiple second mesh units B. Multiple second mesh units B are positioned above each first mesh unit A. The multiple second mesh units B are spaced apart along the length of the first mesh unit A. A transverse seam c is formed between two adjacent second mesh units B. A second longitudinal seam b is formed between two second mesh units B positioned above two adjacent first mesh units A. The second longitudinal seam b is directly above the first longitudinal seam a.

[0037] The ends of the reinforcing bars of the first mesh unit A and the second mesh unit B at the first longitudinal joint a, the second longitudinal joint b, and the transverse joint c are bent inward to form hook heads. The second mesh unit B is supported on the first mesh unit A by stirrups 4.

[0038] As a preferred embodiment, the ends of the reinforcing bars are bent downwards and toward their respective inwards to form hook heads.

[0039] In this embodiment, the ends of the reinforcing bars are bent downwards and inwards by 180° to form hook heads.

[0040] See Figure 7 and Figure 8 As shown, the first mesh unit A includes multiple continuous reinforcing bars 21 and multiple first segmented reinforcing bars 22. The continuous reinforcing bars 21 are arranged along the length of the rib plate 11. The first segmented reinforcing bars 22 are arranged along the width of the rib plate 11. The first segmented reinforcing bars 22 intersect with the continuous reinforcing bars 21. The ends of the continuous reinforcing bars 21 and the segmented reinforcing bars are formed with hook heads.

[0041] See Figure 8 and Figure 9 As shown, the second mesh unit B includes multiple second segmented reinforcing bars 31 and multiple third segmented reinforcing bars 32. The second segmented reinforcing bars 31 are arranged along the length direction of the continuous reinforcing bar 21. The second segmented reinforcing bars 31 and the third segmented reinforcing bars 32 are arranged intersectingly. The second segmented reinforcing bars 31 are welded to the stirrup reinforcing bars 4.

[0042] See Figure 3 and Figure 4 As shown, there are multiple stirrups 4. The multiple stirrups 4 are arranged in a quincunx pattern.

[0043] This invention provides a construction method for the reinforced concrete structure of the floor of an ultra-high voltage electromagnetic shielding room, comprising the following steps:

[0044] S1. Install shielding steel plate 1 at the construction site of the floor.

[0045] S2. Lay multiple first mesh units A of the bottom steel mesh on multiple ribs 11, such that the first mesh units A are arranged along the length direction of the ribs 11, and the multiple first mesh units A are spaced apart along the width direction of the ribs 11, forming a first longitudinal joint a between two adjacent first mesh units A.

[0046] S3. Spot weld the first mesh unit A to the rib plate 11.

[0047] S4. Multiple second mesh units B of the surface steel mesh are erected on the first mesh unit A using stirrups 4, so that multiple second mesh units B are set above each first mesh unit A. The multiple second mesh units B are spaced apart along the length direction of the first mesh unit A. A transverse seam c is formed between two adjacent second mesh units B. The second longitudinal seam b formed between two second mesh units B at the position above two adjacent first mesh units A is directly above the first longitudinal seam a.

[0048] The steel bar structure of the floor of the UHV electromagnetic shielding room of the present invention, during construction, directly lays the floor steel bar mesh (including the bottom steel frame mesh sheet and the surface layer steel bar mesh sheet) on the rib plate of the shielding steel plate, and changes the connection method inside the floor steel bar mesh to spot welding connection. Through the shielding layer (shielding steel plate), the floor steel bar mesh reaches the state of equipotential connection, and also strengthens the shielding efficiency of the ground to a certain extent. At the positions of the preset construction joints and false joints, set segmented bars of different lengths. During laying, by combining the segmented bars of different lengths (the first segmented bar, the second segmented bar, and the third segmented bar), reserve the cutting positions of the construction joints and false joints with a certain spacing inside the floor steel bar mesh (corresponding to the positions of the first longitudinal joint, the second longitudinal joint, and the transverse joint), ensuring that the cutting of the concrete can avoid the positions of the steel bars. Set hook heads at the ends of the full-length bars and segmented bars. During laying, place the hook heads downward to avoid the phenomenon of "tip discharge" at the ends of the cut steel bars.

[0049] The steel bar structure of the floor of the UHV electromagnetic shielding room of the present invention is a double-layer and double-direction steel bar mesh sheet of Φ10mm, which is connected by "U"-shaped stools in the middle. The bottom of the floor steel bar mesh is the shielding layer, which is formed by full welding of the "U"-shaped shielding steel plates with a width of 50cm on the left and right, and a shielding steel plate rib with a height of 5cm is formed at the middle lap joint.

[0050] Before construction, it is necessary to design the floor joint positions according to the ground structure dimensions. The direction of the construction joint is set parallel to the rib plate direction of the shielding steel plate, with a spacing of 6m for each. The direction of the false joint is set perpendicular to the rib plate direction of the shielding steel plate, with a spacing of 8m for each.

[0051] Before laying the bottom steel bar mesh sheet, first carry out the measurement and setting-out work above the rib plate of the shielding layer, determine the reserved positions of the construction joints and false joints, and draw the positions for placing the horizontal and vertical steel bars.

[0052] The original steel bars used for the bottom steel bar mesh sheet and the surface layer steel bar mesh sheet are both HRB400E deformed bars with a diameter of 10mm.

[0053] The total length of the first segmented bar is 5950mm, with both ends bent at 180°, the curved width is 40mm, and the hook length is 80mm.

[0054] The total lengths of the second segmented bar and the third segmented bar are 7950mm, with both ends bent at 180°, the curved width is 40mm, and the hook length is 80mm.

[0055] The length of the continuous reinforcement is the ground length along the shielding rib plate, with both ends bent at 180°, the curved width being 40 mm, the hook length being 80 mm, and the hook being 50 mm away from the edge of the formwork. The lap joint method of the reinforcement within the continuous reinforcement is single-sided lap welding, with a lap length of 200 mm. Around the ground, since the ground dimensions are often irregular, the length of the bent reinforcement can be appropriately adjusted according to the positions of the reserved construction joints and false joints on the outside of the floor reinforcement mesh. However, the ends of the reinforcement need to be bent at 180° at both ends, with the curved width being 40 mm and the hook length being 80 mm.

[0056] During steel bar processing, the first segmented bar, the second segmented bar, and the third segmented bar are formed by cutting a single steel bar and then bending both ends. The continuous reinforcement can be divided into multiple segments and processed separately.

[0057] The stirrup is in a "Ji" shape, with the upper horizontal straight segment length being 150 mm, the lower straight segment being 150 mm, and the height being 100 mm. During processing, the bending angle of the stirrup needs to be strictly controlled. Since the ground structure dimensions are not necessarily regular, the distances between the construction joints and false joints from the outside of the ground may not meet the lengths of 6 m and 8 m. The length of the bent reinforcement on the outside needs to be adjusted according to the distance between the reserved joints and the edge, and the cutting length is also processed according to the specific length.

[0058] When laying the bottom layer of the reinforcement mesh, first lay the first segmented bar of the bottom layer of the reinforcement mesh. When laying, lay the first segmented bar perpendicular to the shielding steel plate rib plate, with a distance of 25 mm from both ends to the reserved construction joint, and the laying spacing is one every 150 mm. The laying spacing in the direction perpendicular to the shielding steel plate rib plate is 6000 mm. The first segmented bar is directly placed above the shielding steel plate rib plate, with the hooks at both ends facing down.

[0059] After the laying of the first segmented bar of the bottom layer of the reinforcement mesh is completed, use carbon dioxide shielded welding to spot weld and fix the connection between the first segmented bar and the shielding steel plate rib plate. After welding, lay the continuous reinforcement of the bottom layer of the reinforcement mesh. The laying direction is parallel to the shielding steel plate rib plate, with a laying spacing of 150 mm. Both ends are directly laid to a distance of 50 mm from the edge of the ground formwork, placed above the first segmented bar, first tied and fixed to the first segmented bar with binding wire, and then spot welded and fixed after the bottom reinforcement is laid. If the position of the continuous reinforcement just happens to be at the construction joint position, the continuous reinforcement at this place is cancelled.

[0060] After that, install the stirrups. Install the stirrups on the continuous reinforcement, and the layout method is diamond-shaped layout. Before construction, according to the positions of the construction joints and false joints, the stirrups need to avoid the construction joints and false joints during layout, and place the legs above the first segmented bar of the bottom layer of the bottom reinforcement, and spot weld and fix the legs of the stirrups to the bottom layer of the reinforcement mesh.

[0061] Finally, lay the surface layer of reinforcing mesh. When laying the surface layer of reinforcing mesh, first lay the second section of the mesh, positioned directly above the continuous reinforcing bars, placed on the stirrups, and secured with tie wire. Both ends of the second section should be 25mm from the dummy joint. Next, lay the third section of the mesh, positioned above the first section of the bottom layer, placed on top of the second and third sections, and secured with tie wire. Avoid the dummy joint area during laying. Since the stirrups must avoid the dummy joint area, the second and third sections at the edges of the surface layer can be added after the first section is laid. After the entire layer is laid, spot weld the joints between the stirrups and the surface layer of reinforcing mesh, and the joints between the horizontal and vertical reinforcing bars of the surface layer, and clean off the tie wire and weld slag.

[0062] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A construction method for the reinforced concrete structure of the floor of an ultra-high voltage electromagnetic shielding room, characterized in that, The steel reinforcement structure of the floor of the ultra-high voltage electromagnetic shielding room includes: A shielding steel plate, wherein multiple ribs are formed on the upper surface of the shielding steel plate; The bottom layer of steel mesh includes multiple first mesh units, which are laid on the multiple ribs and spot-welded to the ribs. The first mesh units are arranged along the length direction of the ribs, and the multiple first mesh units are spaced apart along the width direction of the ribs. A first longitudinal seam is formed between two adjacent first mesh units. The surface steel mesh includes multiple second mesh units. Multiple second mesh units are arranged above each first mesh unit. The multiple second mesh units are spaced apart along the length direction of the first mesh unit. A transverse seam is formed between two adjacent second mesh units. A second longitudinal seam is formed between two second mesh units located above two adjacent first mesh units. The second longitudinal seam is directly above the first longitudinal seam. The ends of the steel bars of the first mesh units and second mesh units at the first longitudinal seam, the second longitudinal seam, and the transverse seam are bent inward to form hook heads. The second mesh units are supported on the first mesh units by stirrups. The construction method for the reinforced concrete structure of the floor of the ultra-high voltage electromagnetic shielding room includes the following steps: Install shielding steel plates at the construction site of the floor slab; Multiple first mesh units of the bottom steel mesh are laid on the multiple ribs, such that the first mesh units are arranged along the length direction of the ribs, and the multiple first mesh units are spaced apart along the width direction of the ribs, with a first longitudinal seam formed between two adjacent first mesh units. The first mesh unit is spot-welded to the rib plate; Multiple second mesh units of the surface steel mesh are erected on the first mesh unit using stirrups, such that multiple second mesh units are arranged above each first mesh unit. The multiple second mesh units are spaced apart along the length of the first mesh unit, and a transverse seam is formed between two adjacent second mesh units. The second longitudinal seam formed between two adjacent first mesh units is directly above the first longitudinal seam.

2. The construction method of the reinforced concrete structure of the floor of the ultra-high voltage electromagnetic shielding room according to claim 1, characterized in that, The first mesh unit includes multiple continuous ribs and multiple first segmented ribs. The continuous ribs are arranged along the length of the rib plate, and the first segmented ribs are arranged along the width of the rib plate. The first segmented ribs are arranged to intersect with the continuous ribs, and the ends of the continuous ribs and the segmented ribs are formed with hook heads.

3. The construction method of the reinforced concrete structure of the floor of the ultra-high voltage electromagnetic shielding room according to claim 2, characterized in that, The second mesh unit includes multiple second segment bars and multiple third segment bars. The second segment bars are arranged along the length direction of the continuous bar. The second segment bars and the third segment bars are arranged to intersect. The second segment bars are welded to the stirrup bars.

4. The construction method of the reinforced concrete structure of the floor of the ultra-high voltage electromagnetic shielding room according to claim 1, characterized in that, The number of the stirrups is multiple, and the multiple stirrups are arranged in a quincunx pattern.

5. The construction method of the reinforced concrete structure of the floor of the ultra-high voltage electromagnetic shielding room according to claim 1, characterized in that, The ends of the reinforcing bars are bent downwards and toward their respective inwards to form the hook heads.

6. The construction method for the reinforced concrete structure of the floor of the ultra-high voltage electromagnetic shielding room according to claim 5, characterized in that, The ends of the reinforcing bars are bent downwards and inwards by 180° to form the hook heads.

Images