Shielding plant terrace construction method, construction structure and special leveling guide rail bracket

Abstract

The invention discloses a construction method, a construction structure and a special leveling guide rail bracket of a shielding plant terrace, and aims to solve the technical problem that the electromagnetic shielding effect is easily influenced by the current construction process of the shielding plant terrace using a shielding steel plate. Comprising the following steps: 1) paving a waterproof layer on a cushion layer; 2) laying a first layer of reinforcing mesh on the waterproof layer; (3) a plurality of leveling guide rail supports are laid on the waterproof layer; (4) steel bar stirrups are arranged on the first layer of steel bar mesh; (5) paving a second layer of reinforcing mesh on the reinforcing stirrups; (6) a plurality of leveling guide rails which are arranged in parallel at intervals are arranged on the second layer of reinforcing mesh; (7) the heights of the top faces of the leveling guide rails supported on the central stand columns of all the leveling guide rail supports are consistent; (8) concrete is poured on the waterproof layer, then leveling, polishing and curing are conducted, and first-layer concrete is obtained; and 9) laying a shielding steel plate on the first layer of concrete, and then pouring a second layer of concrete.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a shielding plant floor construction method, a construction structure and a special leveling guide rail bracket. Background Art

[0002] The shielding plant in the electronic industrial plant needs to have good electromagnetic shielding performance. Traditional floor shielding technologies include lead plate shielding, copper mesh shielding, etc. Among them, copper mesh shielding is prone to electromagnetic leakage at the joints, and lead plate shielding has environmental protection and load-bearing problems. Shielding steel plate is a metal plate specially used for electromagnetic shielding. It has the advantages of good electromagnetic shielding effect, strong load-bearing capacity, high durability, and environmentally friendly materials.

[0003] At present, the construction process of shielded plant floor using shielded steel plates is usually to first lay the shielded steel plates on the constructed concrete cushion layer, and then pour concrete on the shielded steel plates. This type of construction process is very immature and has the following main problems:

[0004] 1) The concrete cushion layer has poor waterproof effect and is prone to water accumulation and seepage, which can easily lead to corrosion of the shielding steel plate, which not only affects its service life, but also reduces the electromagnetic shielding performance and causes shielding failure;

[0005] 2) Because the flatness of the concrete cushion is not strictly controlled, there is a large gap between the shielding steel plate and the concrete cushion. In this case, when the upper concrete is poured, the shielding steel plate is easily deformed due to the deadweight of the concrete and the construction load, which in turn causes gaps in the welding connection between the steel plates, affecting the reliable connection with the grounding system, and thus seriously affecting the electromagnetic shielding effect. Summary of the invention

[0006] The purpose of the present invention is to provide a shielding plant floor construction method, a construction structure and a special leveling guide rail bracket to solve the technical problem that the current shielding plant floor construction process using shielding steel plates is prone to affect the electromagnetic shielding effect.

[0007] In the first aspect, a method for constructing a shielded plant floor is provided, comprising: 1) laying a waterproof layer on a cushion layer; 2) laying a first layer of steel mesh on the waterproof layer; 3) laying a plurality of leveling rail brackets on the waterproof layer, each leveling rail bracket comprising a central column and a plurality of radial claws connected to the side wall of the central column and evenly spaced around the central column, the central column being stably placed on the waterproof layer by the radial claws around it, the bottom of each radial claw being an upwardly curved arc segment, the inner end of the arc segment being inclined and extending upwardly toward the direction close to the central column and being connected to the central column as a whole to form an inner segment of the radial claw, the outer end of the arc segment being extending away from the central column to form an outer segment of the radial claw, the outer segment being welded to the adjacent first layer of steel mesh as a whole; 4) arranging steel stirrups on the first layer of steel mesh; 5) laying a second layer of steel stirrups on the steel stirrups Reinforcement mesh; 6) multiple parallel and spaced leveling rails are arranged on the second layer of reinforcement mesh, so that each leveling rail is supported by the central column of multiple leveling rail brackets arranged at intervals along the length of the leveling rail, and the central column of each leveling rail bracket is supported under the corresponding leveling rail through a height adjustment mechanism; 7) Measure the top surface height of the leveling rail supported on the central column of each leveling rail bracket, and adjust the height adjustment mechanism to make the top surface height of the leveling rail supported on the central column of each leveling rail bracket consistent; 8) Use the top surface of the above-mentioned leveling rail as the height reference of the first layer of concrete to pour concrete on the waterproof layer, and then level, grind and maintain to obtain a first layer of concrete, and the flatness of the first layer of concrete does not exceed 2 mm within any 1 meter range; 9) Lay a shielding steel plate on the first layer of concrete, and then pour the second layer of concrete on the shielding steel plate.

[0008] As an optimization and / or instantiation of the shielding plant floor construction method of the first aspect mentioned above, further: the upper part of the central column is a screw rod, on which are installed a first nut located above the leveling rail and a second nut located below the leveling rail, the leveling rail is clamped between the first nut and the second nut and its top surface height is adjusted by adjusting the positions of the first nut and the second nut on the screw rod.

[0009] As an optimization and / or instantiation of the shielding plant floor construction method of the first aspect mentioned above, further: the second nut is provided with an anti-rotation lever which is integral with the second nut.

[0010] As an optimization and / or instantiation of the shielding plant floor construction method of the first aspect above, further: the number of radial claws on the leveling guide rail bracket is three.

[0011] As an optimization and / or instantiation of the shielding plant floor construction method of the first aspect mentioned above, further: the leveling rail adopts angle steel, and the central column of each flat rail bracket is supported under the bottom plate of the corresponding angle steel through a height adjustment mechanism, and the side plate of the angle steel is vertically arranged.

[0012] The second aspect provides a shielded plant floor construction structure, including: a waterproof layer, laid on the cushion layer; a first layer of steel mesh, laid on the waterproof layer; a plurality of leveling rail brackets, laid on the waterproof layer, each leveling rail bracket having a central column and a plurality of radial claws connected to the side wall of the central column and evenly spaced along a circumference of the central column, the central column is stably placed on the waterproof layer through the radial claws around it, the bottom of each radial claw is an upwardly curved arc segment, the inner end of the arc segment is inclined and extends upward in a direction close to the central column and is connected to the central column to form an inner segment of the radial claw, and the outer end of the arc segment extends in a direction away from the central column to form an outer segment of the radial claw, and the outer segment is welded to the adjacent first layer of steel mesh as a whole; steel stirrups, arranged on the first layer of steel mesh; The second layer of steel mesh is laid on the steel stirrups; a plurality of leveling rails are arranged in parallel and at intervals on the second layer of steel mesh, each leveling rail is supported by a central column of a plurality of leveling rail brackets arranged at intervals along the length of the leveling rail, the central column of each leveling rail bracket is supported under the corresponding leveling rail through a height adjustment mechanism, and the top surface height of the leveling rails supported on the central column of each leveling rail bracket is consistent; the first layer of concrete is cast on the waterproof layer with the top surface of the above-mentioned leveling rail as the height reference, and the flatness does not exceed 2 mm within any 1-meter range. After solidification, the first layer of steel mesh, leveling rail bracket, steel stirrup, second layer of steel mesh and leveling rail are all buried in the first layer of concrete; a shielding steel plate is laid on the first layer of concrete; the second layer of concrete is cast on the shielding steel plate.

[0013] As an optimization and / or instantiation of the shielding plant floor construction structure of the second aspect mentioned above, further: the upper part of the central column is a screw rod, on which are installed a first nut located above the leveling rail and a second nut located below the leveling rail, the leveling rail is clamped between the first nut and the second nut and its top surface height is adjusted by adjusting the positions of the first nut and the second nut on the screw rod.

[0014] As an optimization and / or instantiation of the shielding plant floor construction structure of the second aspect mentioned above, further: the second nut is provided with an anti-rotation lever which is integral with the second nut.

[0015] As an optimization and / or instantiation of the shielding plant floor construction structure of the second aspect above, further: the number of radial claws on the leveling guide rail bracket is three;

[0016] As an optimization and / or instantiation of the shielding plant floor construction structure of the second aspect mentioned above, further: the leveling rail adopts angle steel, and the central column of each flat rail bracket is supported under the bottom plate of the corresponding angle steel through a height adjustment mechanism, and the side plate of the angle steel is vertically arranged.

[0017] According to a third aspect, a leveling rail bracket is provided for use in the shielding plant floor construction method of the first aspect. The bracket comprises a central column and a plurality of radial claws connected to the side walls of the central column and evenly spaced around the central column. The bottom of each radial claw is an upwardly curved arc segment. The inner end of the arc segment extends upwardly and obliquely toward the central column and is connected to the central column to form an inner segment of the radial claw. The outer end of the arc segment extends away from the central column to form an outer segment of the radial claw. When in use, the central column is stably placed on the waterproof layer through the radial claws around it. The outer segment is welded to the adjacent first layer of steel mesh as a whole. The central column is supported under the corresponding leveling rail through a height adjustment mechanism.

[0018] As an optimization and / or instantiation of the leveling guide rail bracket of the third aspect mentioned above, further: the upper part of the central column is a screw rod, on which are mounted a first nut located above the leveling guide rail and a second nut located below the leveling guide rail, the leveling guide rail is clamped between the first nut and the second nut and its top surface height is adjusted by adjusting the positions of the first nut and the second nut on the screw rod.

[0019] As an optimization and / or instantiation of the leveling guide rail bracket of the third aspect mentioned above, further: an anti-rotation lever which is integral with the second nut is provided on the second nut.

[0020] As an optimization and / or instantiation of the leveling guide rail bracket of the third aspect above, further: the number of radial claws on the leveling guide rail bracket is three.

[0021] The shielding plant floor construction method, construction structure and special leveling guide rail bracket provided by the present invention solve the problem of corrosion of shielding steel plates caused by poor waterproof effect of concrete cushion layer in the prior art by laying a waterproof layer on the cushion layer; by arranging a leveling guide rail bracket with a central column and radial claws, a stable load-bearing skeleton is formed in cooperation with a first layer of steel mesh, steel stirrups and a second layer of steel mesh, thereby achieving high-precision leveling of the first layer of concrete without damaging the waterproof layer, ensuring that the flatness of the first layer of concrete does not exceed 2 mm within any range of 1 meter, and being able to solve the problem of large gap between shielding steel plate and concrete cushion layer in the prior art, and easy deformation of shielding steel plate due to deadweight of concrete and construction load, avoiding the situation that gaps appear in welding connections between steel plates and affect reliable connection with grounding system, and finally achieving good electromagnetic shielding performance of shielding plant.

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this specification are used to assist the understanding of the present invention. The contents provided in the drawings and the related descriptions in this specification can be used to explain the present invention, but do not constitute improper limitations on the present invention.

[0024] Figure 1 The present invention is a process flow chart of a shielded plant floor construction method according to an embodiment of the present invention.

[0025] Figure 2 for Figure 1 A schematic diagram of the structure of the waterproof layer and the first layer of steel mesh, the leveling rail bracket, the steel stirrup, the second layer of steel mesh and the leveling rail in the method shown.

[0026] Figure 3 for Figure 2 A partial enlarged schematic diagram is shown in the figure.

[0027] Figure 4 for Figure 3 It is a local enlarged schematic diagram.

[0028] Figure 5 for Figure 1 Actual photographs of the waterproof layer and first layer of steel mesh, leveling rail bracket, steel stirrups, second layer of steel mesh and leveling rail in the method shown.

[0029] Figure 6 for Figure 1 Actual photo of the method shown when measuring the height of the top surface of the leveling rail supported on the center column of each leveling rail bracket.

[0030] Figure 7 The figure is a schematic structural diagram of an improved leveling guide rail bracket according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0032] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0033] The embodiments of the present invention involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0034] The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0035] Figure 1 The present invention is a process flow chart of a shielded plant floor construction method according to an embodiment of the present invention. Figure 2 for Figure 1 A schematic diagram of the structure of the waterproof layer and the first layer of steel mesh, the leveling rail bracket, the steel stirrup, the second layer of steel mesh and the leveling rail in the method shown. Figure 3 for Figure 2 A partial enlarged schematic diagram is shown in the figure. Figure 4 for Figure 3 It is a local enlarged schematic diagram. Figure 5 for Figure 1 Actual photographs of the waterproof layer and first layer of steel mesh, leveling rail bracket, steel stirrups, second layer of steel mesh and leveling rail in the method shown. Figure 6 for Figure 1 Actual photo of the method shown when measuring the top height of the leveling rail supported on the center column of each leveling rail bracket. Figure 1-Figure 6 As shown, a shielding plant floor construction method includes:

[0036] Step S1: Lay the waterproof layer 1 on the cushion layer. In this embodiment, the waterproof layer 1 specifically adopts TPO waterproof membrane. TPO waterproof membrane is a thermoplastic waterproof material made of a blend of polyolefin (PP or PE) and ethylene propylene rubber (EPDM). It does not contain chlorine and plasticizers, has excellent weather resistance, tear resistance, temperature resistance (-40°C to 120°C) and chemical stability, can achieve reliable seam connection through hot melt welding, and is convenient for construction in waterproof projects; especially in shielded plant applications, its long-lasting waterproof effect, good compatibility with concrete structures and no effect on electromagnetic shielding performance make it an ideal choice of waterproof layer material.

[0037] Step S2: Lay the first layer of steel mesh 2 on the waterproof layer 1. The first layer of steel mesh 2 is a standard load-bearing component in the concrete floor. It is made of longitudinal and transverse steel bars arranged crosswise at a certain interval and tied and fixed. It mainly bears the tensile stress in the concrete structure. In the construction of the shielding plant floor of the present invention, the first layer of steel mesh 2 not only plays its basic force-bearing role, but more importantly, it serves as the basic component of the entire leveling system. It forms an overall force-bearing system by welding with the radial claws of the leveling guide rail bracket (described later), and together with the upper steel stirrups and the second layer of steel mesh, it constitutes a load-bearing skeleton. This structural design ensures that the first layer of concrete meets extremely high flatness requirements and provides a stable and flat base surface for the subsequent installation of the shielding steel plate.

[0038] Step S3: laying a plurality of leveling rail brackets 3 on the waterproof layer 1, each leveling rail bracket 3 having a central column 31 and a plurality of (specifically three) radial claws 32 connected to the side wall of the central column 31 and evenly spaced around the central column, the central column 31 is stably placed on the waterproof layer 1 by the radial claws 32 around it, the bottom of each radial claw 32 is an upwardly curved arc segment 321, the inner end of the arc segment 321 extends upwardly at an angle toward the central column 31 and is connected to the central column to form an inner segment 322 of the radial claw 32, the outer end of the arc segment 321 extends away from the central column 31 to form an outer segment 323 of the radial claw 32, and the outer segment is welded to the adjacent first layer of steel mesh. Since the bottom of the radial claws 32 of the leveling guide rail bracket 3 is designed with an upwardly curved arc section 321, the sharp edge is prevented from directly contacting the waterproof layer 1, thereby protecting the integrity of the waterproof layer; at the same time, the central column 31 cooperates with the radial claws 32 evenly distributed circumferentially to form a radial support structure, wherein the inclined design of the arc section 321 and the inner section 322 provides good force transmission, and the welding connection between the outer section 323 and the first layer of steel mesh 2 forms a solid overall force system. This structure not only ensures the overall stability and bearing capacity of the leveling guide rail bracket 3, but also provides a precise elevation control point for the upper structure.

[0039] Step S4: Set the steel stirrup 4 on the first layer of steel mesh 2. The steel stirrup 4 is a common component in concrete structures. Its shape is similar to an inverted "U" shape. It is mainly used to connect the upper and lower layers of steel mesh and provide vertical support, ensure the spacing between the upper and lower layers of steel mesh, ensure the effective thickness of concrete, and jointly bear the shear force. In the construction of the shielding plant floor of the present invention, in addition to playing its basic supporting and positioning role, the steel stirrup 4, in addition to playing its basic supporting and positioning role, is more importantly to form an overall frame system with the leveling guide rail bracket 3 and the first layer of steel mesh 2, ensuring that the first layer of concrete can be accurately leveled, creating ideal basic conditions for the subsequent installation of the shielding steel plate.

[0040] Step S5: Lay the second layer of steel mesh 5 on the steel stirrup 4. The second layer of steel mesh 5 is a standard load-bearing component in the concrete structure, and together with the first layer of steel mesh 2, forms a "double-layer steel mesh" system. In the construction of the shielding plant floor of the present invention, the second layer of steel mesh 5 forms a complete three-dimensional load-bearing frame through the steel stirrup 4, the first layer of steel mesh 2 at the bottom, and the leveling guide rail bracket 3, providing a stable spatial support system for the pouring of the first layer of concrete.

[0041] Step S6: A plurality of parallel and spaced leveling rails 6 are arranged on the second layer of steel mesh 5, so that each leveling rail 6 is supported by a central column 31 of a plurality of leveling rail brackets 3 spaced along the length of the leveling rail 6, and the central column of each leveling rail bracket 31 is supported under the corresponding leveling rail through a height adjustment mechanism. In this embodiment, the upper portion of the central column 31 is a screw rod, on which a first nut 33 located above the leveling rail 6 and a second nut 34 located below the leveling rail are installed, and the leveling rail is clamped between the first nut 33 and the second nut 34, and its top surface height is adjusted by adjusting the positions of the first nut and the second nut on the screw rod. In addition, the leveling rail 6 is specifically made of angle steel, and the central column 31 of each leveling rail bracket 3 is supported under the bottom plate of the corresponding angle steel through a height adjustment mechanism, and the side plate of the angle steel is vertically arranged. It can be seen that the leveling rail 6 achieves precise elevation control through the height adjustment mechanism (first nut 33 and second nut 34) on the central column 31. Each leveling rail 6 is supported by the central column 31 of multiple leveling rail brackets 3. By adjusting the relative positions of the first nut 33 and the second nut 34 on the screw rod, the top surface height of the leveling rail 6 can be accurately controlled; multiple parallel and spaced leveling rails 6 form a precise elevation control network. During the pouring of the first layer of concrete, the top surface of the leveling rail 6 is used as the reference surface for leveling.

[0042] Step S7: Measure the top surface height of the leveling rail supported on the central column of each leveling rail bracket, and adjust the height adjustment mechanism to make the top surface height of the leveling rail supported on the central column of each leveling rail bracket consistent. By measuring and adjusting the height adjustment mechanism (first nut 33 and second nut 34) of each leveling rail bracket, the top surface height of all leveling rails 6 is kept consistent. This precise height control is a prerequisite for achieving subsequent high-precision leveling of concrete. Specifically, a high-precision level can be used to measure the top surface height of the leveling rail 6 supported on the central column 31 of each leveling rail bracket 3.

[0043] The specific use process of the level in the leveling rail height control is as follows: first, select the reference point at the construction site, set up a high-precision level and adjust it to horizontal; then, according to the arrangement order of the leveling rail 6, measure the height of the top surface of the leveling rail 6 on each leveling rail bracket 3 in turn. When measuring, place the level ruler vertically on the top surface of the leveling rail 6, determine its elevation by reading the level, and compare it with the reference elevation. If a height difference is found, fine-tune the position of the first nut 33 and the second nut 34 on the center column 31 until the top surface of the leveling rail 6 reaches the designed elevation. In order to ensure the measurement accuracy, the method of repeated measurement and verification is adopted, and the measurement principle of "from a known point to an unknown point" is followed, so that the top surface of all leveling rails 6 finally forms an accurate horizontal control surface, providing a precise benchmark for subsequent concrete leveling.

[0044] Step S8: pour concrete on the waterproof layer using the top surface of the leveling rail as the height reference for the first layer of concrete, and then perform leveling, grinding and curing to obtain the first layer of concrete. The flatness of the first layer of concrete does not exceed 2 mm within any 1-meter range.

[0045] In terms of concrete mixing, the water-cement ratio is controlled to be no more than 0.45, the slump is controlled at 160±20㎜, and the cement dosage is no less than 350kg / m 3 The maximum particle size of aggregate crushed stone is not more than 25mm; the initial setting time is controlled within 3 to 4 hours, and the final setting time is not more than 12 hours. The water-cement ratio is not more than 0.45 and the cement dosage is not less than 350kg / m 3 The strength and durability of the concrete are ensured, the slump is controlled at 160±20mm, which provides good workability and fluidity, the maximum particle size of crushed stone is not more than 25mm, which improves the uniformity and surface smoothness of the concrete, and the initial setting time of 3 to 4 hours and the final setting time of not more than 12 hours ensure sufficient leveling construction time and timely solidification to prevent cracking. The synergistic effect of these parameters provides the material basis for achieving high-precision flatness.

[0046] In terms of concrete pouring, the material should be poured layer by layer and vibrated layer by layer. It should neither be close to the formwork nor hard vibrate the steel bars and leveling rail components. During the vibration process, "fast insertion and slow withdrawal" should be adopted. It is advisable to slightly twitch the vibrating rod up and down to make the concrete evenly vibrated. The vibration points should be evenly distributed in a plum blossom shape, and the spacing should be controlled within 500mm. The vibration time of each vibration point should be based on the level of the concrete surface, no significant settlement, no bubbles, and mortar on the surface. Over-vibration or under-vibration should be eliminated. Pumped concrete is poured to the elevation position, and the concrete is spread and leveled so that the pile is slightly higher than the horizontal line by about 50mm; the pause time during pouring should be minimized to ensure the continuity of pouring and prevent cold joints. At the same time, in order to ensure the accuracy of the elevation during the entire pouring process, the on-site management personnel should strictly manage the on-site construction throughout the process. If there is any collision or stepping on the rail components, or if there is any question about the rail elevation, the rail elevation should be reviewed and adjusted in time to ensure the elevation and flatness of the concrete after the later stage of forming.

[0047] In terms of concrete leveling, the concrete is vibrated and leveled using a dedicated small vibration beam or vibration scraper set on the dividing rail and pushed forward at a uniform and slow speed, with a speed of about 0.3 to 1.0 m / min, depending on the actual construction conditions on site. After compaction by the vibration beam or vibration scraper, a special leveling aluminum alloy scraper is used to correct the flatness. The aluminum alloy scraper is close to the rail and moves back and forth along the rail to level the concrete. It is not suitable to rotate and level in any direction to prevent height differences caused by uneven force. The number of times of leveling depends on the construction conditions and flatness. The aluminum alloy ruler uses a large cross-section form with high rigidity and not easy to deform, and the length is controlled at 4 meters.

[0048] When the concrete begins to enter the initial setting state, a hand-held trowel is used for the first paddle operation, and a cross-shaped operation method is used along the guide rail. The material is spread manually, and the paddle start time is pushed forward as much as possible. Areas such as corners that cannot be polished by the local trowel are manually smoothed. If uneven areas are found during the smoothing construction, they will be leveled by scraping high and filling low, and checked with a 3-meter scraper to ensure flatness. During the construction process, the generation of footprints is strictly controlled, and the cement slurry that contaminates the surface of the adjacent warehouse will be cleaned. Due to inconsistent water exudation of concrete during initial setting, water-depleting potholes will form on the concrete surface. After the first slurry is raised, a 4-meter aluminum alloy scraper is used to perform the second leveling treatment in a cross-shaped manner, scraping high and filling low, and filling the potholes on the ground. If the uneven areas are scraped and filled, they will be filled with materials to improve the flatness of the concrete.

[0049] The time to start the grinding work is selected according to the weight of the sitting trowel and the state of the concrete. As an important equipment and key technical link in the construction of super-flat floor, the sitting double-disc trowel uses spiral, cross-shaped, back-and-forth cross grinding and other techniques to perform the second paddle grinding operation on the ground, and repeatedly rubs and compacts the ground concrete. If there is still uneven water seepage in some areas of the concrete after rubbing, and the surface is bumpy, a 4-meter aluminum alloy scraper is used again for leveling.

[0050] After the above-mentioned processes meet the requirements and the concrete surface has initially set to the final stage, the floor is finely ground and polished. First, remove the disc of the sitting trowel, and then use spiral, cross-shaped, back-and-forth cross-grinding and other techniques to carry out the floor polishing operation. Repeated polishing and compaction treatment is performed on the concrete to ensure the later glossiness and fineness of the concrete surface. In the corners where the sitting trowel cannot reach, manual and hand-held trowels are used for edge finishing.

[0051] After the ground construction is completed, in order to prevent the concrete moisture from evaporating too quickly, special curing agents can be used for curing or plastic film can be used to cover the concrete and sprinkle water on it for curing.

[0052] Step S9: Lay the shielding steel plate on the first layer of concrete, and then pour the second layer of concrete on the shielding steel plate. Since the flatness of the first layer of concrete does not exceed 2 mm within any 1-meter range, the problem of large gap between the shielding steel plate and the first layer of concrete in the prior art, which is easy to cause deformation of the shielding steel plate due to the dead weight of concrete and construction load, is solved, and the welding connection between the steel plates is avoided. The gap and the influence on the reliable connection with the grounding system are avoided, and finally the good electromagnetic shielding performance of the shielding plant is achieved.

[0053] It can be seen that the above-mentioned shielding plant floor construction method solves the problem of poor waterproof effect of concrete cushion layer in the prior art leading to corrosion of shielding steel plate by laying a waterproof layer 1 on the cushion layer; by setting a leveling guide rail bracket 3 with a central column 31 and a radial claw 32, a first layer of steel mesh 2, a steel stirrup 4, and a second layer of steel mesh 5 are cooperated to form a stable load-bearing skeleton, and high-precision leveling of the first layer of concrete is achieved without destroying the waterproof layer 1, ensuring that the flatness of the first layer of concrete does not exceed 2 mm within any 1-meter range, and can solve the problem of large gap between the shielding steel plate and the concrete cushion layer in the prior art, and easy deformation of the shielding steel plate due to the dead weight of concrete and construction load, avoiding the gap in the welding connection between the steel plates and the impact on the reliable connection with the grounding system, and finally achieving good electromagnetic shielding performance of the shielding plant.

[0054] The main body of an electronic industrial workshop is made of steel structure. The project covers an area of 5,066 ㎡, with a building area of 7,785 ㎡ and a building height of 43.8 m. It includes a large-span single-story high-precision equipment main workshop and a 4-story auxiliary building. After the floor of about 4,000 ㎡ in the main workshop was constructed according to the floor construction method of the shielding workshop floor in the above embodiment, a super-flat floor standard was achieved where the flatness of the first layer of concrete does not exceed 2 mm within any 1-meter range.

[0055] However, it was found during the actual construction process that when adjusting the positions of the first nut 33 and the second nut 34 on the central column 31, since the second nut 34 determines the height of the leveling guide rail 6, it is necessary to first adjust the second nut 34 in place and then tighten the first nut 33. However, when tightening the first nut 33, due to the friction between the threads and the stress transmission on the contact surface, a rotational torque will be generated. This torque is transmitted to the second nut 34 through the threads, causing the adjusted second nut 34 to rotate slightly, affecting the final height of the leveling guide rail 6. This phenomenon is particularly obvious during precise height adjustment because even a very small rotation of the second nut 34 will cause a significant change in the height of the leveling guide rail 6. To address this problem, as Figure 7 shown, an anti-rotation lever 341 integrated with the second nut 34 is welded to the second nut 34. The anti-rotation lever 341 extends radially from the second nut 34, facilitating contact with the fingers. The operator can directly press against the anti-rotation lever 341 with a finger. During the process of tightening the first nut 33, the reverse force applied by the finger is used to counteract the rotational torque and prevent the second nut 34 from rotating accordingly. This manual assistance method is more flexible than other fixing devices. It can be easily released when adjusting the height and can quickly apply resistance when fixation is required, ensuring precise control of the height of the leveling guide rail 6. At the same time, the radially extending structure of the anti-rotation lever 341 also facilitates observing whether the second nut 34 rotates, improving the controllability of the construction process.

[0056] The above has described the relevant content of the present invention. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. Based on the above content of this specification, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of the present invention.

Claims

1. Shielding plant floor construction method, characterized by: include: 1) Laying a waterproof layer on the cushion layer; 2) Laying a first layer of steel mesh on the waterproof layer; 3) Laying a plurality of leveling rail brackets on the waterproof layer, each of which has a central column and a plurality of radial claws connected to the side wall of the central column and evenly spaced around the central column, the central column is stably placed on the waterproof layer by the radial claws around it, the bottom of each radial claw is an upwardly curved arc segment, the inner end of the arc segment extends upwardly in a direction close to the central column and is connected to the central column as a whole to form an inner segment of the radial claw, and the outer end of the arc segment extends away from the central column to form an outer segment of the radial claw, and the outer segment is welded to the adjacent first layer of steel mesh as a whole; 4) Steel stirrups are arranged on the first layer of steel mesh; 5) Laying a second layer of steel mesh on the steel stirrups; 6) A plurality of parallel and spaced leveling rails are arranged on the sheet, so that each leveling rail is supported by a central column of a plurality of leveling rail brackets spaced along the length of the leveling rail, and the central column of each leveling rail bracket is supported under the corresponding leveling rail through a height adjustment mechanism; 7) The top surface height of the leveling rail supported on the central column of each leveling rail bracket is measured, and the top surface height of the leveling rail supported on the central column of each leveling rail bracket is made consistent by adjusting the height adjustment mechanism; 8) Concrete is poured on the waterproof layer using the top surface of the above-mentioned leveling rail as the height reference of the first layer of concrete, and then leveled, polished and cured to obtain a first layer of concrete, and the flatness of the first layer of concrete does not exceed 2 mm within any 1-meter range; 9) A shielding steel plate is laid on the first layer of concrete, and then a second layer of concrete is poured on the shielding steel plate.

2. The shielding plant floor construction method according to claim 1, characterized in that: The upper part of the central column is a screw rod, on which a first nut located above the leveling rail and a second nut located below the leveling rail are installed. The leveling rail is clamped between the first nut and the second nut and its top surface height is adjusted by adjusting the positions of the first nut and the second nut on the screw rod.

3. The shielding plant floor construction method according to claim 2, characterized in that: The second nut is provided with an anti-rotation lever which is integral with the second nut.

4. The shielding plant floor construction method according to claim 1, characterized in that: There are three radial claws on the leveling rail bracket.

5. The shielding plant floor construction method according to claim 1, characterized in that: The leveling rail adopts angle steel, and the central column of each leveling rail bracket is supported under the bottom plate of the corresponding angle steel through a height adjustment mechanism, and the side plate of the angle steel is vertically arranged.

6. Shielding plant floor construction structure, characterized by: include: A waterproof layer is laid on the cushion layer; a first layer of steel mesh is laid on the waterproof layer; a plurality of leveling rail brackets are laid on the waterproof layer, each of which has a central column and a plurality of radial claws connected to the side wall of the central column and evenly spaced around the central column, the central column is stably placed on the waterproof layer by the radial claws around it, the bottom of each radial claw is an upwardly curved arc segment, the inner end of the arc segment is inclined and extends upward toward the direction close to the central column and is connected to the central column as a whole to form an inner segment of the radial claw, and the outer end of the arc segment extends away from the central column to form an outer segment of the radial claw, and the outer segment is welded to the adjacent first layer of steel mesh as a whole; steel stirrups are arranged on the first layer of steel mesh; a second layer of steel mesh is laid on the steel On the stirrup; multiple leveling rails are arranged in parallel and at intervals on the second layer of steel mesh, each leveling rail is supported by the central column of multiple leveling rail brackets arranged at intervals along the length of the leveling rail, the central column of each leveling rail bracket is supported under the corresponding leveling rail through a height adjustment mechanism, and the top surface height of the leveling rail supported on the central column of each leveling rail bracket is consistent; the first layer of concrete is cast on the waterproof layer with the top surface of the above-mentioned leveling rail as the height reference, and the flatness does not exceed 2 mm within any 1 meter range. After solidification, the first layer of steel mesh, leveling rail bracket, steel stirrup, second layer of steel mesh and leveling rail are all buried in the first layer of concrete; shielding steel plate is laid on the first layer of concrete; the second layer of concrete is cast on the shielding steel plate.

7. The shielding plant floor construction structure according to claim 6, characterized in that: The upper part of the central column is a screw rod, on which a first nut located above the leveling rail and a second nut located below the leveling rail are installed. The leveling rail is clamped between the first nut and the second nut and its top surface height is adjusted by adjusting the positions of the first nut and the second nut on the screw rod.

8. The shielding plant floor construction structure as claimed in claim 7, characterized in that: The second nut is provided with an anti-rotation lever which is integral with the second nut.

9. The shielding plant floor construction structure according to claim 6, characterized in that: The number of radial claws on the leveling rail bracket is three; And / or, the leveling rail adopts angle steel, and the central column of each leveling rail bracket is supported under the bottom plate of the corresponding angle steel through a height adjustment mechanism, and the side plate of the angle steel is vertically arranged.

10. A leveling rail bracket, used in the shielding plant floor construction method according to any one of claims 1 to 5, characterized in that: It has a central column and a plurality of radial claws connected to the side wall of the central column and evenly spaced around the central column. The bottom of each radial claw is an upwardly curved arc segment. The inner end of the arc segment extends upwardly and obliquely toward the central column and is connected to the central column to form an inner segment of the radial claw. The outer end of the arc segment extends away from the central column to form an outer segment of the radial claw. When in use, the central column is stably placed on the waterproof layer through the radial claws around it. The outer segment is welded to the adjacent first layer of steel mesh as a whole. The central column is supported under the corresponding leveling guide rail through a height adjustment mechanism.

Images