A super-precision flat ground recyclable artificial leveling track regulator

Abstract

The utility model discloses a kind of super-precision ground's turnover artificial leveling track regulator, belong to building construction technical field.The regulator is composed of base screw rod, reinforcing bar support base, triangular reinforcing bar support, unequal angle steel and double bolt locking assembly;Angle steel web is long circular hole and is sleeved on screw rod, realizes stepless lifting and quick disassembly by upper and lower nuts, forms continuous, continuously adjustable scraping ruler track.After the upper flange top surface of angle steel is surveyed by line and level, it can be used as the sliding reference of 6m aluminum alloy scraping ruler, to realize large-area concrete one-time artificial scraping leveling.The device single-point weight is less than 5kg, without large mechanical load, convenient to install and disassemble, can be recycled and has construction joint separation function, and can be widely used in super-precision ground engineering such as industrial plant, logistics warehouse, underground garage.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a reusable track adjuster for manual leveling of ultra-precise concrete floors, suitable for manual precision leveling of large-area concrete floors in industrial plants, logistics warehouses, underground garages, etc. Background Technology

[0002] With the increasing demands for floor flatness in multi-story industrial plants, logistics warehouses, and large commercial complexes, ultra-high precision concrete floors (with extremely high FF / FL values) have become a standard requirement. While commonly used laser screeds are highly efficient, they suffer from drawbacks such as high equipment rental costs, applicability only to the ground floor or first floor, the tendency for the wheels to damage reinforcing mesh and supports, and stringent requirements on the load-bearing capacity of the floor slab formwork support system. Furthermore, corner areas still require manual secondary leveling. These shortcomings are even more pronounced during multi-story construction, preventing the widespread adoption of laser screeds on second floors and above.

[0003] Traditional manual leveling typically employs a method of "mortar spots + screeds + string lines" in conjunction with a 2-3 m aluminum alloy scraper. This method is highly susceptible to human error and has the following drawbacks: The flatness of the ribs themselves is difficult to guarantee, and cumulative errors are prone to occur. The area covered by single-pass leveling is small, resulting in low construction efficiency and high requirements for workers' skills and patience. Mortar screed / plastering material is consumed only once, has a low turnover rate, and generates a large amount of construction waste. It cannot provide a continuous, stable and finely adjustable sliding reference for long scrapers (≥5 m), making it difficult to meet the high performance requirements of FF / FL.

[0004] Therefore, there is an urgent need for a lightweight track adjustment device that is simple in structure, easy to install and dismantle, reusable, and can provide a continuous and accurate reference for long scrapers, in order to replace traditional screeds and large machinery, and achieve efficient and high-quality manual leveling of ultra-precise floors. Utility Model Content

[0005] This invention addresses the limitations of existing laser screed machines in floor operations and the instability and lack of reusability of traditional mortar screeds / plasters in achieving flatness. It aims to provide a reusable manual leveling track adjuster for ultra-precise floor leveling. Through a liftable and reusable lightweight track, it provides a continuous and precise reference for a long scraper, enabling large areas of concrete on floors and the ground floor to meet high FF / FL standards with a single manual scraping operation. This significantly improves construction efficiency and flatness pass rate, while reducing material consumption and construction costs.

[0006] To achieve the above objectives, this utility model is implemented as follows: A reusable manual leveling track adjuster for ultra-precise leveling surfaces includes: The base screw (1) is vertically anchored to the floor slab formwork or cushion layer; The steel bar support base (2) is fitted and locked to the lower end of the base screw (1) to maintain the verticality and lateral stiffness of the base screw (1); The steel bar support (3) is fixedly connected to the steel bar support base (2) to form a triangular support; Unequal angle steel (4) is arranged in the transverse direction, and its web has an elongated hole (41) for forming the sliding track of the aluminum alloy scraper. The double bolt locking assembly (5) has a lower nut (51) and an upper nut (52), and the unequal angle steel (4) is clamped between the upper and lower nuts to achieve stepless fine adjustment of elevation and quick disassembly; The top surface of the upper flange of the unequal angle steel (4) forms a continuous flat reference surface after being re-measured by a string line and a level, which is used for the long scraper to slide and complete the manual leveling of the concrete.

[0007] Furthermore, the base screw (1) is a fully threaded round steel with a diameter of 12 mm. The lower end is anchored to the formwork or padding, and the upper end extends 10 mm–150 mm beyond the finished concrete surface. This size takes into account the thickness of the concrete protective layer of the floor and the height of common formwork joists, so that the same screw can be used for the construction of the first floor and the floors without cutting or lengthening, reducing the types of materials to be prepared on site.

[0008] Furthermore, the steel reinforcement support base (2) proposes a "cross" or "T" shaped welding scheme and sets concrete protective layer pads at the ends. This structure can be placed directly on the pad when there is no floor slab reinforcement, increasing the contact area with the concrete base and preventing verticality deviation caused by "virtual feet" of the screw; the pads also ensure that the thickness of the protective layer at the joint meets the specification requirements.

[0009] Furthermore, the steel reinforcement support (3) is a φ12 mm steel reinforcement bent triangular brace with a longitudinal spacing of 800 mm–1000 mm. After the triangular brace and the base (2) are spot welded or tied together, they form a planar stable system that can withstand the horizontal lateral force ≤100 N when the scraper slides, thus preventing the angle steel (4) from lateral displacement within a 6 m span.

[0010] Furthermore, the unequal angle steel (4) is model L25×16×3 mm, and an oblong hole (41) with a diameter of 14 mm and a hole spacing of 900 mm is opened on the web. The hole diameter is 2 mm larger than the base screw, which not only retains the sliding allowance but also prevents stress concentration on the hole wall; the 900 mm hole spacing is a multiple of the bracket spacing, which can realize standardized processing and reduce on-site hole opening.

[0011] Furthermore, a washer (53) is added to the double bolt locking assembly (5). The lower nut (51) bears the vertical load transmitted by the angle steel and the scraper, and the upper nut (52) clamps the angle steel by torque, forming a "bearing-compression" dual function, so that the flatness of the top surface of the 6 m span angle steel is ≤2 mm, which meets the FF / FL index of ultra-fine flat ground.

[0012] Furthermore, the length of a single angle steel (4) is 5 m, the staggered joints of adjacent sections are ≥500 mm, and the angle steel is allowed to continuously run through two construction joints. This arrangement allows the angle steel to serve as a scraper track before and after the initial setting of the concrete, and construction joints can be formed directly without the need for removal in the later stage, saving the secondary cutting process and reducing the risk of floor cracking.

[0013] Furthermore, a 1×1 mm chamfer or R1 rounded transition is provided on the top surface of the upper flange of the angle steel (4). This small geometric change can significantly reduce the frictional resistance when the aluminum alloy scraper slides, reduce the wear of the angle steel edge, and extend the service life by about 20%.

[0014] Furthermore, a quick-release sleeve is added between the base screw (1) and the steel bar support base (2). After loosening the upper nut (52), the angle steel (4) can be pulled out upwards along with the sleeve. The single node removal time is ≤30 s, which meets the "24 h rail removal" requirement of the early stripping formwork system and realizes the synchronization of rail and concrete flow operations.

[0015] Furthermore, the plane of the triangular brace is arranged coplanarly with the axis of the base screw (1), so that the support, screw, and angle steel form a "planar truss" force transmission path. This structure controls the maximum deflection of the 6 m span angle steel to within 1 mm when the scraper slides, ensuring that the reference plane of the long scraper does not deform throughout the entire process, and further improving the flatness consistency.

[0016] In summary, this utility model uses a combination of four parts—base screw, triangular bracket, angle steel, and double nuts—to form a continuous track that is adjustable, can be disassembled early, and can be rotated indefinitely. It meets the requirements of ultra-precise flatness, saves materials, has no mechanical load, and can also serve as a construction joint. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the elevation installation of the track adjuster of this utility model.

[0018] Figure 2 This is a schematic diagram of the isometric installation of the track adjuster of this utility model. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] This example is taken from the construction of the prefabricated floor slab of the second floor of a logistics and warehousing project in East China. The floor area is 12,000 m². 2 Design live load 50 kN / m 2 The concrete strength grade is C35, the thickness is 180 mm, and the requirements are FF≥65 and FL≥40 (super-precision leveling standard). Since prestressed hollow formwork has been installed under the slab, heavy-duty laser leveling machines are strictly prohibited from entering. After comparing different options, the "reusable manual leveling track adjuster" of this utility model was adopted for the demonstration construction of fully manual leveling.

[0021] 1. Materials and Equipment Base screws: Q235 φ12 mm×300 mm fully threaded round steel, galvanized layer ≥40 μm, 1200 screws in total.

[0022] Rebar support base: 2 φ12 mm short bars / set, welded on site into a "+" shape, with 30 mm thick mortar pads.

[0023] Rebar support: φ12 mm steel bar bent triangular brace, web length 250 mm, batch prefabrication of 1,200 pieces.

[0024] Unequal angle steel: L25×16×3 mm, fixed length 5 m / piece, web plate stamped with φ14 mm oblong hole @900 mm, total 240 pieces.

[0025] Double bolt assembly: 2 M12 galvanized hex nuts / point + 1 φ14 mm spring washer / point.

[0026] Inspection tools: 6 m aluminum alloy scraper, 0.5 mm precision string, Leica digital level, feeler gauge.

[0027] 2. Construction Process Step S1: Laying out and positioning: Mark the center line of the angle steel at 5 m intervals, and then mark the bolt points at 0.9 m intervals to ensure that the misalignment of the angle steel joints is ≥500 mm.

[0028] Step S2 Install base screw (1): Drill a hole of φ14 mm×80 mm with an electric hammer, embed the screw and tighten the bottom nut, with a uniform exposed height of 130 mm.

[0029] Step S3 Fix the base of the steel bar support (2): Spot weld the cross short bar to the screw rod, put a 30 mm mortar pad at the bottom, and tie additional steel bars around the perimeter to prevent loose feet.

[0030] Step S4 Install steel reinforcement bracket (3): Tie the bottom foot of the triangular brace to the base, and tighten the top end with the screw rod, with a longitudinal spacing of 900mm, to form a lateral stability system.

[0031] Step S5: Lifting angle steel (4): 5 m angle steel is manually lifted and placed in position at one time. The oblong hole (41) is aligned with the screw and gently placed. Check that the gap between the hole wall and the screw is 2 mm to meet the sliding requirements.

[0032] Step S6 Initial leveling and fine adjustment: First, use the lower nut (51) to roughly adjust the top surface of the angle steel to the design elevation -5 mm, then pull the nylon line to re-measure, use a level to check, and rotate the upper nut (52) point by point to tighten, so that the flatness within 6 m is ≤2 mm.

[0033] Step S7 Concrete pouring and leveling: Pumped concrete with a slump of 160 mm, after manual placement, use a 6 m aluminum alloy scraper to continuously slide along the upper flange of the angle steel, leveling the width ≥ 5 m in one pass; finish the surface with a ride-on power trowel before initial setting.

[0034] Step S8 Early dismantling and turnover: After the concrete has set (about 18 h), loosen the upper nut (52) for 30 s, and the angle steel (4) is pulled out along with the sleeve. After rinsing off the slurry, it is transferred to the next flow section to achieve "late installation and early dismantling" continuous turnover.

[0035] The parameters in this embodiment are applicable to cast-in-place or prefabricated floor slabs of C30–C60 size and 150–250 mm thickness. They are also applicable to ground floor slabs and ultra-precision leveling projects such as industrial plants, logistics warehouses, and underground garages with steel mesh. For larger thicknesses or spans, only the angle steel type and bolt diameter need to be increased proportionally, which still falls within the protection scope of this utility model.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A reusable manual leveling track adjuster for ultra-precise flat surfaces, characterized in that, include: The base screw (1) is vertically anchored to the floor slab formwork or cushion layer; The steel bar support base (2) is fitted and locked to the lower end of the base screw (1) to maintain the verticality and lateral stiffness of the base screw (1); The steel bar support (3) is fixedly connected to the steel bar support base (2) to form a triangular support; Unequal angle steel (4) is arranged in the transverse direction, and its web has an elongated hole (41) for forming the sliding track of the aluminum alloy scraper. The double bolt locking assembly (5) has a lower nut (51) and an upper nut (52), and the unequal angle steel (4) is clamped between the upper and lower nuts to achieve stepless fine adjustment of elevation and quick disassembly; The top surface of the upper flange of the unequal angle steel (4) forms a continuous flat reference surface after being re-measured by a string line and a level, which is used for the long scraper to slide and complete the manual leveling of the concrete.

2. The reusable manual leveling track adjuster for ultra-precision leveled surfaces according to claim 1, characterized in that, The base screw (1) is a fully threaded round steel with a diameter of 12 mm. Its lower end is anchored to the template or padding layer, and its upper end extends 10 mm–150 mm beyond the finished concrete surface.

3. The reusable manual leveling track adjuster for ultra-precision leveled surfaces according to claim 1, characterized in that, The steel bar support base (2) is made of two φ12 mm steel bars horizontally welded into a "+" or "T" shape, and a concrete protective layer pad is set at the end to prevent the base from being loose.

4. The reusable manual leveling track adjuster for ultra-precision leveled surfaces according to claim 1, characterized in that, The steel bar support (3) is made of φ12 mm steel bars bent into triangular supports, and the bottom foot is spot welded or tied to the steel bar support base (2), and arranged at a longitudinal spacing of 800 mm–1000 mm.

5. The reusable manual leveling track adjuster for ultra-precision leveled surfaces according to claim 1, characterized in that, The unequal angle steel (4) is of model L25×16×3 mm, with an elongated hole (41) of 14 mm in diameter and a hole spacing of 900 mm, and is clearance-fitted with the base screw (1).

6. The reusable manual leveling track adjuster for ultra-precision leveled surfaces according to claim 1, characterized in that, The double bolt locking assembly (5) also includes a washer (53), a lower nut (51) for bearing and coarsely adjusting the elevation, and an upper nut (52) for tightening and finely adjusting the flatness. After adjustment, the flatness of the top surface of the angle steel is ≤2 mm / 6 m.

7. The reusable manual leveling track adjuster for ultra-precision leveled surfaces according to claim 1, characterized in that, The unequal angle steel (4) has a single length of 5 m and the ends of two adjacent angle steels are staggered by ≥500 mm. It can also serve as a construction joint separator to reduce the need for later cutting.

8. The reusable manual leveling track adjuster for ultra-precise flat surfaces according to any one of claims 1 to 7, characterized in that, The unequal angle steel (4) has a chamfer or rounded transition in the sliding area on the top surface of the upper flange to reduce the sliding resistance of the aluminum alloy scraper and reduce the wear of the angle steel edge.

9. The reusable manual leveling track adjuster for ultra-precise flat surfaces according to any one of claims 1 to 7, characterized in that, A quick-release sleeve is provided between the base screw (1) and the steel bar support base (2). The angle steel (4) can be pulled out as a whole by unscrewing the upper nut (52) upwards, which meets the needs of continuous turnover construction.

10. The reusable manual leveling track adjuster for ultra-precision leveled surfaces according to any one of claims 1 to 7, characterized in that, The triangular support plane of the steel bar bracket (3) is arranged in the same plane as the axis of the base screw (1), forming a planar truss effect, so that the deflection of the angle steel (4) within a span of 6 m is ≤1 mm, ensuring that the reference surface does not deform when the long scraper slides.

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