Narrow space thin wall structure and construction method thereof

Abstract

The invention relates to a narrow space thin wall structure and a construction method.The narrow space thin wall structure comprises a filling body used for filling a narrow space and a formwork used for being arranged on the side wall of the inner side of the narrow space, a reinforced concrete layer is arranged between the filling body and the formwork, and a keel layer used for supporting the formwork is arranged on the formwork; a protection bolt penetrating through the filling body, the formwork, the reinforced concrete layer and the keel layer is further arranged and used for providing transverse supporting force for the filling body, the formwork, the reinforced concrete layer and the keel layer. According to the narrow-space thin-wall wall structure and the construction method thereof, the whole cavity is filled with the filling body, the filling body and the formworks on the two sides form a concrete pouring space, the multi-section screw is integrally reinforced, and therefore a formwork system with strength, rigidity and stability is formed, corresponding technical measures are added in the method, and the construction cost is reduced. Therefore, cast-in-place requirements of the bare concrete are met, and appearance quality of the bare concrete is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of special-shaped buildings, and in particular to a narrow space thin-walled wall structure and a construction method thereof. Background Art

[0002] In the field of bare concrete construction, the working surface of narrow and confined spaces such as air shafts and structural cavities is less than 50 cm, making it impossible for traditional equipment to enter. Workers even have to squeeze sideways to turn around, but the template installation error in this space needs to be controlled within ±0.5mm. Therefore, the construction of thin-walled wall structures in narrow spaces can be called a century-old technological problem. In addition, it is difficult for vibrators to penetrate into narrow and confined spaces, and concrete is prone to process cancers such as cold joints and bubble chains, which destroy the overall mirror-like appearance of the building. Summary of the Invention

[0003] An embodiment of the present invention provides a thin-wall wall structure in a narrow space and a construction method thereof, which uses polystyrene boards to fill the entire narrow space, and multi-stage through-wall screws to reinforce the entire space, forming a template system with strength, rigidity, and stability, and adding corresponding technical measures to meet the requirements of cast-in-place plain concrete, ensure the visual quality of plain concrete, and ensure the appearance effect of plain concrete.

[0004] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] A thin-walled wall structure for a narrow space includes a filling body for filling the narrow space and a template for being arranged on the inner side wall of the narrow space. A reinforced concrete layer is arranged between the filling body and the template. A keel layer for supporting the template is arranged on the template. Protective bolts are also arranged that penetrate the filling body, the template, the reinforced concrete layer and the keel layer to provide lateral support for the filling body, the template, the reinforced concrete layer and the keel layer.

[0006] Furthermore, the filler is any one of a polystyrene board, a polyurethane foam board, a mineral wool filler, and a rock wool filler.

[0007] Furthermore, a protective gasket is provided on the protective bolt between the filling body and the reinforced concrete layer, a first limiting piece is provided between the reinforced concrete layer and the formwork, a reinforcing rib is provided on the outside of the keel layer, and a second limiting piece is provided on the outside of the reinforcing rib.

[0008] Furthermore, the side surface of the protective gasket that contacts the filling body is a plane, an inclined surface or an arc surface, and the side surface of the protective gasket that contacts the reinforced concrete layer is provided with a slot for embedding steel bars.

[0009] Furthermore, the first limiting member is a conical nut, the wide side of the conical nut is in contact with the formwork, and the narrow side is in contact with the reinforced concrete layer.

[0010] A method for constructing a thin-walled wall structure in a narrow space is provided, and the method is used for constructing the thin-walled wall structure in a narrow space. The method comprises the following steps:

[0011] S1. Based on architectural drawings of thin-walled structures in narrow spaces, holographic scanning technology is first used to generate model information. The scanning data is then converted into a point cloud using the scanning equipment's supporting software. Finally, the point cloud modeling function is used to generate a BIM model, which includes a BIM model for the infill and a BIM model for the special-shaped component.

[0012] S2. Produce filling body units and special-shaped component units respectively according to the filling body BIM model and the special-shaped component BIM model;

[0013] S3. Install the filling body according to the filling body BIM model;

[0014] S4. Install multi-section bolts according to the BIM model of special-shaped components;

[0015] S5. Install the formwork and keel layers on both sides according to the BIM model of the special-shaped component;

[0016] S6, pouring reinforced concrete layer;

[0017] S7. Removal of special-shaped components.

[0018] Furthermore, in S2, the BIM model of the special-shaped component is imported into the Rhino platform to decompose the surface curve of the special-shaped component; then, the tiling function of the Rhino platform is used to unfold the surface of the special-shaped component into a plane topological grid to obtain the surface unfolding diagram of the special-shaped component, and at the same time, the missing sections are eliminated through a parametric algorithm to achieve accurate mapping of complex surfaces; then, a two-dimensional coordinate system is added to the surface unfolding diagram of the special-shaped component, and the splicing gaps between the templates are added to the surface unfolding diagram of the special-shaped component according to the architectural drawings.

[0019] Furthermore, the cushion block and the filling unit in S2 form an integrated prefabricated module.

[0020] Furthermore, in S4, the edges of the processed template are polished and sealed with water, the cut templates are stacked on the processing table in the order of assembly, and the adjacent unit blocks are clamped, and then the template joints are sealed with glass glue; after the template joints are sealed, the secondary purlins are installed, the secondary purlins are fixed with angle codes, holes are opened at the two outermost secondary purlins, and lifting holes are set.

[0021] The embodiments of the present invention have the following advantages:

[0022] In a narrow space thin-walled wall structure and a construction method thereof of the present invention, a filler is used to fill the entire cavity. The filler and the formwork on both sides form a concrete pouring space. The multi-stage screw is integrally reinforced to form a formwork system with strength, rigidity and stability. This method adds corresponding technical measures to meet the requirements of cast-in-place plain concrete and ensure the visual quality of the plain concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0024] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0025] Figure 1 A template structure diagram of a narrow space thin-walled wall structure provided by an embodiment of the present invention;

[0026] Figure 2 A front view of a narrow space thin-wall structure provided by an embodiment of the present invention;

[0027] Figure 3 A structural diagram of a multi-section bolt in a narrow space thin-walled wall structure provided by an embodiment of the present invention;

[0028] Figure 4 A flow chart of a construction method for a narrow space thin-wall structure provided by an embodiment of the present invention.

[0029] In the picture:

[0030] 1. Filling body; 2. Formwork; 3. Reinforced concrete layer; 4. Keel layer; 5. Protective bolts; 6. Protective gaskets; 7. First limiter; 8. Second limiter; 9. Reinforcement ribs; 10. Slot. DETAILED DESCRIPTION

[0031] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0032] like Figure 1-2 As shown, a thin-walled wall structure in a narrow space includes a filling body 1 for filling the narrow space and a formwork 2 for being arranged on the inner side wall of the narrow space, a reinforced concrete layer 3 is arranged between the filling body 1 and the formwork 2, a keel layer 4 for supporting the formwork 2 is arranged on the inner and / or outer side of the formwork 2, and a protective bolt 5 is provided that passes through the filling body 1, the formwork 2, the reinforced concrete layer 3 and the keel layer 4, and the protective bolt 5 is used to provide lateral support force for the filling body 1, the formwork 2, the reinforced concrete layer 3 and the keel layer 4.

[0033] In the present technology, the filler 1 is any one of polystyrene board, polyurethane foam board, mineral wool filler, and rock wool filler. Among them, polystyrene board is preferably extruded polystyrene board. Extruded board is a rigid foam plastic board made of polystyrene resin supplemented with polymer, injected with catalyst while heating and mixing, and then extruded to produce continuous closed-cell foam. Its interior is an independent closed-cell structure. It is an environmentally friendly thermal insulation material with excellent properties such as high compressive strength, low water absorption, moisture resistance, airtightness, light weight, corrosion resistance, super anti-aging (almost no aging after long-term use), and low thermal conductivity. The mineral wool filler and rock wool filler are plates or rectangular blocks.

[0034] The filler body 1 is composed of a plurality of filler body units, most of which are rectangular plate-like structures. When installing the filler body 1 in a narrow space, in order to improve the vertical deformation resistance of the filler body units, a zigzag overlap process is adopted, that is, the splicing edges of the filler body units are provided with trapezoidal or dovetail-shaped concave and convex tooth grooves. During installation, the concave and convex tooth grooves of adjacent filler body units are staggered and engaged to form a continuous bite surface. The concave and convex tooth grooves can increase the contact area and shear strength between the filler body units, effectively limit the connection displacement of the plate, avoid dislocation deformation caused by temperature stress or load, thereby enhancing the integrity of the filler body 1. It is suitable for areas with high wind pressure or high-rise building enclosure systems.

[0035] In this technology, the formwork 2 is preferably a clear-faced formwork or WISA board. Clear-faced formwork is a type of building formwork 2. In northern China, this formwork is made of high-quality birch, poplar, or other wood materials, and in southern China, pine, fir, eucalyptus, or other wood materials. The surface is impregnated with highly waterproof phenolic resin and then hot-pressed to form a wood plywood formwork 2. The formwork 2 has a smooth, even surface and is named "clear-faced formwork" because the concrete surface cast using the clear-faced formwork is smooth. Clear-faced formwork has significant advantages over conventional building formwork: it is lightweight, has a large format, is non-warping, non-deforming, non-cracking, has excellent water resistance, and has a long service life. Furthermore, clear-faced formwork is highly corrosion-resistant and will not contaminate the concrete surface. It can be processed into various shapes according to construction needs.

[0036] WISA board is a high-grade building formwork specially used for building concrete pouring. Its base is made of Nordic birch, and its gluing grade meets the European standard EN 314-2 3, EXTERIOR. Both sides of the formwork are usually covered with 120g / m 2 or 220g / m 2 The phenolic resin film has the characteristics of high strength, light weight, weather resistance and wear resistance.

[0037] like Figure 3 As shown, a protective gasket 6 is provided on the protective bolt 5 between the filling body 1 and the reinforced concrete layer 3, a first limiting member 7 is provided between the reinforced concrete layer 3 and the formwork 2, a reinforcing rib 9 is provided on the outside of the keel layer 4 for supporting the keel layer 4, and a second limiting member 8 is provided on the outside of the reinforcing rib 9 on the protective bolt 5.

[0038] The side of the protective gasket 6 that contacts the filler 1 is a plane, an inclined surface, or an arc surface. The side of the protective gasket 6 that contacts the reinforced concrete layer 3 is provided with a slot 10 for embedding the steel bar. The protective gasket 6 is used to convert the linear connection between the steel bar and the filler 1 into a surface connection, dispersing the pressure of the steel bar on the filler 1, thereby eliminating the destructive force of the steel bar on the filler 1. In this technology, the shape of the protective gasket 6 is circular, square, rectangular, or polygonal. The filler 1 is combined with the protective gasket 6 with a width of not less than 40mm, and its coverage area is not less than 7500mm. 2 Compared to traditional plum blossom pads, the protective pad 6 of this technology can improve support efficiency by 120%. The slot 10 on the protective pad 6 can be nested with Φ12-18mm steel bars, forming a double-layer stress dispersion structure, effectively absorbing impact energy of no less than 200J / m2, and can control the thickness error of the protective layer to within ±1.5mm.

[0039] The first limiting member 7 and the second limiting member 8 are both nuts, which are used to fix and limit the template 2, the keel layer 4, and the reinforcement 9. The first limiting member 7 is located on the inner side of the template 2 and is used to position the template 2. It adopts positive and negative wire head connection technology to achieve ±50mm bidirectional adjustment function, which is adapted to the assembly requirements of the complex template 2 system. The second limiting member 8 provides support for the keel layer 4 by locking the reinforcement 9, so that the keel layer 4 can effectively support the template 2 and ensure the flatness of the template 2. Among them, the first limiting member 7 adopts a conical nut, the wide side of the conical nut is in contact with the template 2, and the narrow side is in contact with the reinforced concrete layer 3. The conical nut deformation joint is through a pressure bite mechanism (0.8-1.2MPa), which can form a rigid anchor node with a torque resistance of not less than 30N·m, ensuring that there is no displacement during the pouring process. The first limiting member 7 has a built-in 3mm deformation redundancy, which can automatically compensate for the ±2mm template 2 offset and simultaneously resist the concrete rheological stress and temperature stress. In this technology, the screw rod cooperates with the telescopic adjustment mechanism of the first limit member 7 (stroke>150mm), covering the shear wall thickness range of 150-400mm, and can achieve precise adaptation to special-shaped walls.

[0040] The keel layer 4 uses double-piece Q235B hot-dip galvanized channel steel (specifications 80×40×5mm) as the main load-bearing skeleton. The two channel steels are welded back to back to form an "I"-shaped section with a spacing of ≤400mm. The welding seam is polished smooth after full welding, and the surface is sprayed with epoxy zinc-rich paint for rust prevention.

[0041] like Figure 4 As shown, a construction method of a narrow space thin-walled wall structure includes the following steps:

[0042] S1. Based on the architectural drawings of thin-wall structures in narrow spaces, holographic scanning technology is first used to generate model information. The scanning data is then converted into a point cloud using the scanning equipment's supporting software. The BIM model is then generated using the point cloud modeling function. The BIM model includes a filler BIM model and a special-shaped component BIM model.

[0043] Based on architectural drawings of thin-walled structures in confined spaces, holographic scanning technology is first used to generate model information for the infill volume and the irregular-shaped component. For irregular, narrow spaces such as air shafts and cavities, these spaces are then divided into standardized modules. Spatially optimized cavity analysis is then performed to achieve assembly gaps down to 1mm. Specifically, a high-precision flatbed scanner is used to convert the architectural drawings into high-definition electronic images (such as TIFF / PDF formats), ensuring a resolution of 300dpi or higher. For blueprints or large-scale drawings, they are scanned in sections and then stitched together using software (such as Adobe Photoshop or AutoCAD Raster Design) to produce electronic images of the infill volume and irregular-shaped components. The scanned data is then converted into point clouds of the infill volume and irregular-shaped components using the scanning equipment's accompanying software (such as Faro Scene or Leica Cyclone), achieving millimeter-level accuracy. The "Create Model from Point Cloud" function is then used to generate BIM models of the infill volume and irregular-shaped components, respectively. Then, metadata not marked in the architectural drawings (such as material properties and load information) are added to the infill BIM model and the special-shaped component BIM model. In this technology, formwork 2, formwork 2, reinforced concrete layer 3 and keel layer 4 except for the infill 1 are all special-shaped structures. Use AI tools (such as Autodesk's AI plug-in) to automatically identify symbols in the drawings and associate them with the database. Finally, compare the scanned model with the original drawing to check whether key dimensions (such as column spacing and elevation) are consistent. At the same time, use tools such as CloudCompare to align the point cloud with the design model and correct deviations. This method can accurately locate the surface geometry and geometric dimensions of each concrete component in a small space structure, so that the surface geometric dimension error of the concrete component is ≤0.3mm.

[0044] For the infill BIM model, this technology uses standard-sized infills 1 based on the dimensions of the narrow space, then assembles and secures the entire structure. For example, polystyrene boards come in two thicknesses: 0.08m and 0.09m. If the infill space is 0.5m wide, (0.08 + 0.09) polystyrene boards are used * 3 boards = 0.51m. If the infill space is 0.66m wide, (0.08 + 0.09) polystyrene boards are used * 4 boards = 0.68m. To address the issue of pressure distribution between the reinforced concrete layers 3 on both sides, the infills 1 are placed vertically, with their largest surface in contact with the reinforced concrete layer 3, and all of the infills 1 are then packaged and secured as a whole.

[0045] For the BIM model of special-shaped components, the model information of the narrow space structure is imported into the Rhino platform. The Rhino platform first disassembles the surface curves of the special-shaped components in the narrow space structure, and uses the model refinement function of the Rhino platform to improve the information model.

[0046] The Rhino platform's tiling function is then used to unfold the surface of the irregular component into a planar topological mesh, determining its surface geometry. A parametric algorithm is then used to eliminate missing cross-sections, achieving precise mapping of complex surfaces. This parametric algorithm abstracts the shape characteristics of the geometric model (such as curvature, size, and topological relationships) into adjustable parameters. For example, the coordinates of the control points in the curve equation and the coefficients of the surface generating function can be dynamically adjusted as independent parameters.

[0047] Then, a two-dimensional coordinate system is added to the surface expansion diagram of the special-shaped component. That is, the plane topological grid after the surface of the special-shaped component is expanded is flattened to the XY plane, and the surface expansion diagram of the special-shaped component after being flattened to the XY plane is imported into the CAD platform using the export function. According to the size of template 2 in the architectural drawing, the splicing gaps between the templates in all directions (up, down, left, and right) are added to the surface expansion diagram of the special-shaped component.

[0048] Then, in the expanded surface diagram of the irregular component, the locations of the joints and bolt holes were refined in conjunction with the architectural drawings. Bolt holes were pre-embedded with nanometer-level tolerances, and self-locking notches were reserved for complex joints. This notch was reserved in the expanded surface diagram of the irregular component, and the machining contour was drawn, achieving a machining contour error exceeding the ±0.5mm process limit. Throughout the entire process, digital modeling was employed to reduce the joint error of Template 2 to a hairline level (≤0.2mm), completely eliminating honeycomb defects.

[0049] S2. Produce filling body units and special-shaped component units respectively based on the filling body BIM model and the special-shaped component BIM model.

[0050] The infill units, which require connection to the pads, were fabricated based on the BIM model. These were then assembled with high precision in the factory using a robotic arm, employing hot-melt embedded snap-in technology to create an integrated prefabricated "pad-insulation board-wire mesh" module. The pad's contact surface was mirror-polished, and a 0.05mm-thick silicone buffer layer was placed between the pads and the formwork. After pouring, the concrete surface remained free of pad marks, achieving a "zero color difference, zero air holes" finish for a clear-faced concrete finish.

[0051] Based on the BIM model of the special-shaped component, the protective bolts 5 and the formwork units were separately machined. Before machining formwork 2, the material loss rate of formwork 2 was calculated based on the surface development diagram of the special-shaped component. If the loss rate exceeded 40%, the layout of formwork 2 must be re-optimized. Ultimately, after actual measurement, the machining loss rate of formwork 2 was reduced to less than 10%. Based on the optimized layout diagram, a CNC machine tool cutting path was designed, and a machining program was edited to cut formwork 2 and the keel. Based on the outer contour of the keel, a CNC automatic machining program was compiled to machine the keel.

[0052] The template 2 adopts a laser-calibrated non-disassembly metal template (error ≤ 0.5mm). The non-disassembly metal template only serves as a template. The angle steel wall reinforcement is constructed according to the structural design requirements. The position of the reinforcement positioning line is reviewed before construction to ensure the accuracy of the position of each special-shaped component, and realize zero-error integrated forming of the template 2 and the angle steel wall reinforcement, breaking through the problem of damage to the clear water surface layer caused by the disassembly and assembly of traditional templates; at the same time, based on the BIM three-dimensional coordinate system, the bolt holes of the template components are positioned at the atomic level (accuracy ±1mm) according to the surface expansion diagram of the special-shaped components, and a heat map of the reinforcement avoidance path is generated simultaneously.

[0053] S3. Install the filling body according to the filling body BIM model;

[0054] When installing the filling unit in a small space, this technology requires the operator to wear AR glasses to project the three-dimensional coordinates of the filling unit's BIM model, compare the design position in real time, and use an infrared locator to assist in adjustment to ensure that the spacing deviation between each polystyrene board and the structural wall is ≤0.5mm.

[0055] The filling units are placed vertically and packaged as a whole. The filling units are fixed with tape. Tie bars are placed on the top of each whole filling body 1 (the length of the tie bars is the inner net width between the two side templates minus 8cm). The inner and outer filling units are tied and connected. At the same time, formwork 2 protective pads are arranged at the tie position to control the thickness of the protective layer. In order to improve the vertical deformation resistance of the filling body 1, a zigzag overlap process is adopted. During construction, special cutting tools are required to cut concave and convex grooves for the filling unit to ensure the accuracy of the grooves. During assembly, the overlap seams of the concave and convex grooves are fully coated with polymer bonding mortar to enhance the bite density.

[0056] S4. Install multi-section bolts according to the BIM model of special-shaped components;

[0057] According to the BIM model of the special-shaped component, the bolts are passed through the protective gasket 6 of the filling body 1, the lengths on both sides of the bolts are measured to be the same, and then the first limiters 7 are installed on both sides of the bolts.

[0058] S5. Install the formwork and keel layers on both sides according to the BIM model of the special-shaped component.

[0059] According to the BIM model of the special-shaped component, the template 2 and the keel layer 4 are installed, with the template unit as the main part. The template units need to be assembled before installation. Before assembly, the processed template units need to be polished and sealed with water to remove burrs on the edges of the plates, ensure the tight connection between the templates 2, and fundamentally avoid the problem of black lines in the Zen seams caused by water absorption by the template 2. After that, the template units are stacked on the processing table in the order of assembly, and the adjacent template units are clamped to ensure that the joints are tightly fitted. The joints of adjacent templates 2 should be reinforced and fixed to increase the rigidity of the template unit joints to ensure that the joints do not leak or lose water. This technology uses special connecting plates to reinforce and fix the joints, and uses glass glue to seal the joints between the template units. After aligning the horizontal joints of two adjacent template units, use a nail gun to fix them. Apply glass glue to the joints and press the joints. Use transparent tape to seal them. Use small strips to fix them and tighten them with a nail gun. Use self-tapping screws to fix the strips at the cross joints. Reinforce the four adjacent templates 2 and fix them between the two cross joints with self-tapping screws and small strips.

[0060] After the formwork unit joints are sealed, keel layer 4 is installed. The keels on both sides are installed first, followed by the middle and upper end keels. The keels are fixed with angle brackets. Holes are drilled in the two outermost keels to provide lifting holes, resulting in a special-shaped component. The main steel keels on both sides are rigidly connected to the secondary keels (50×50×3mm square steel) using M16 high-strength multi-stage bolts (grade 8.8). The bolt holes are pre-drilled using CNC machines with a hole position error of ≤0.5mm. 20mm thick steel connecting lugs are installed at the ends of the keels. The lugs are positioned and welded to the embedded concrete structure parts using a laser total station to ensure an axis deviation of ≤2mm / 10m. When installing the main steel keels on both sides vertically, a dual laser plumb line and electronic inclination sensor are used to monitor verticality in real time, dynamically adjusting the thickness of the steel wedge pads to achieve a verticality deviation of ≤1 / 2000. Horizontally, a 5kN preload is applied through a prestressed tensioner to eliminate flexural deformation of the steel keel and ensure the straightness of the exposed wall surface at full height is ≤3mm. 12mm thick stiffening ribs are welded every 600mm between the steel keels on both sides, and adjustable steel pipe braces (Φ48×3.5mm) are installed in the middle of the keel span to form a statically indeterminate spatial truss system that can withstand concrete lateral pressure ≥60kN / m 2 This method achieves mirror-like flatness for formwork 2, with no visible gaps detected by a 5m ruler, achieving millimeter-level architectural aesthetic precision. Following installation, the formwork units are inspected and tested to ensure spatial position, geometric dimensions, straightness, and verticality meet all required acceptance criteria. The specifications of the through-wall bolts are also checked to ensure they meet construction process requirements, with a minimum of 14mm.

[0061] Install the assembled formwork 2 and keel layer 4 in the designated position. This technology uses protective bolts to tie the formwork 2 on both sides. Waterstop plugs are installed on the inside of the formwork 2, and a PVC pipe is added in the middle to fix it and act as a limiter. Install the main keel. Use short wooden keels to reinforce the adjacent curved formwork units to ensure accurate vertical joints. Then install the second limiter 8 on the outside of the keel layer 4 to fix it.

[0062] After all the special-shaped components are assembled, structural acceptance is carried out, including dimensional review of the established BIM model based on the architectural drawings of the narrow space thin-walled wall structure to ensure the accuracy of the geometric dimensions; review of the geometric shape and geometric dimensions of the surface expansion drawing of the special-shaped component based on the BIM model and architectural drawings to ensure the accuracy of the special-shaped component unit; review of the position of the steel bars based on the surface expansion drawing of the special-shaped component to ensure that the position of the component steel bars avoids the bolt holes; check the machine tool processing program code to see if it corresponds to the on-site template unit processing and meets the processing needs; check the manufactured template unit to verify whether the geometric dimensions are consistent with the dimensions of the surface expansion drawing of the special-shaped component.

[0063] S6. Pouring of reinforced concrete layer.

[0064] After acceptance, the reinforced concrete layer 3 is poured. In this technology, the reinforced concrete layers 3 on both sides of the filling body 1 are poured simultaneously. In order to ensure the quality of concrete pouring, the joints of the Zen joints are strictly controlled. It is required that the horizontal and vertical Zen joints at the junction of the new and old concrete do not exceed the requirements of the specifications. Strict control can be achieved through three methods, including observation, touch, and 0.5mm feeler gauge. The 0.5mm feeler gauge method does not allow the gap to be filled in 1 / 2. The back of the formwork 2 is connected with a connecting plate to control and adjust the size of the gap. At 5mm below the junction of the new and old concrete, a plastic sheet is fixed and covered on the surface of the old concrete. The upper edge of the plastic sheet is sealed with tape to prevent contamination of the finished concrete.

[0065] The concrete slump should also be checked. Before pouring concrete, a small amount of mortar should be poured to prevent root rot in wall columns. Place vibrators at the pouring site to ensure preliminary vibration of the concrete and a full bond between the aggregate and the slurry. During vibrating, space the vibrators 300mm apart and vibrate in layers, with a thickness of approximately 500mm. To ensure a tight bond between adjacent concrete layers, insert the vibrator 100mm below the interface between the new and old concrete. For accuracy, use a clip to mark the edges. Add a vibrator at the wall ends, corners, and T-shaped walls. Use a slow pull-out vibrator to minimize air bubbles. When pouring to the top edge, after vibrating, close and calender the surface 100mm from the side of formwork 2, ensuring the top edge of formwork 2 is clean. Never add water to the concrete during pouring, as this can easily result in a scratchy surface. Never place the vibrator against the formwork, as this can damage the formwork and leave scars on the exposed concrete surface.

[0066] S7. Removal of special-shaped components.

[0067] Remove the supporting auxiliary frame, loosen the reinforcement bolts, remove the main keel steel pipe, square steel, square and round buckles, beam clamps and other reinforcement materials, remove the plain concrete unit formwork 2, and it is strictly forbidden to use iron tools such as crowbars to pry along the edges and corners of the plain concrete components.

[0068] According to the quality acceptance specifications for bare concrete, the physical quality of bare concrete components after the formwork 2 is removed is inspected and accepted, including: whether the verticality, straightness, flatness and geometric dimensions of the components meet the requirements of the specifications; whether the bare concrete joints, bolt holes, drip lines, decorative lines and reserved openings meet the requirements of the surface expansion drawings of special-shaped components, and whether their spatial position and form meet the requirements; whether there are any visual defects or obvious color differences on the surface of the components.

[0069] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made thereto. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A narrow space thin wall structure, characterized by: It includes a filling body for filling a narrow space and a template for being set on the inner side wall of the narrow space. A reinforced concrete layer is set between the filling body and the template. A keel layer for supporting the template is set on the template. Protective bolts that pass through the filling body, template, reinforced concrete layer and keel layer are also set to provide lateral support force for the filling body, template, reinforced concrete layer and keel layer.

2. The narrow space thin-wall structure according to claim 1, characterized in that: The filler is any one of a polystyrene board, a polyurethane foam board, a mineral wool filler, and a rock wool filler.

3. The narrow space thin-wall structure according to claim 1, characterized in that: The protective bolt is provided with a protective gasket between the filling body and the reinforced concrete layer, a first limiter is provided between the reinforced concrete layer and the formwork, a reinforcing rib is provided on the outside of the keel layer, and a second limiter is provided on the outside of the reinforcing rib.

4. The narrow space thin-wall structure according to claim 3, characterized in that: The side surface of the protective gasket that contacts the filling body is a plane, an inclined surface or an arc surface, and the side surface of the protective gasket that contacts the reinforced concrete layer is provided with a slot for embedding steel bars.

5. The narrow space thin-wall structure according to claim 3, characterized in that: The first limiting member is a conical nut, the wide side of the conical nut is in contact with the template, and the narrow side is in contact with the reinforced concrete layer.

6. A construction method for a narrow space thin-walled wall structure, characterized in that: The method for constructing a narrow space thin-walled wall structure according to any one of claims 1 to 5 comprises the following steps: S1. Based on architectural drawings of thin-walled structures in narrow spaces, holographic scanning technology is first used to generate model information. The scanning data is then converted into a point cloud using the scanning equipment's supporting software. Finally, the point cloud modeling function is used to generate a BIM model, which includes a BIM model for the infill and a BIM model for the special-shaped component. S2. Produce filling body units and special-shaped component units respectively according to the filling body BIM model and the special-shaped component BIM model; S3. Install the filling body according to the filling body BIM model; S4. Install multi-section bolts according to the BIM model of special-shaped components; S5. Install the formwork and keel layers on both sides according to the BIM model of the special-shaped component; S6, pouring reinforced concrete layer; S7. Removal of special-shaped components.

7. The method for constructing a narrow space thin-walled wall structure according to claim 6, characterized in that: In said S2, the BIM model of the special-shaped component is imported into the Rhino platform, and the surface curve of the special-shaped component is disassembled; Then, the tiling function of the Rhino platform is used to unfold the surface of the special-shaped component into a plane topological grid to obtain the surface unfolding diagram of the special-shaped component. At the same time, a parametric algorithm is used to eliminate missing sections and achieve accurate mapping of complex surfaces. Then add a two-dimensional coordinate system to the surface development diagram of the special-shaped component, and then add the splicing gaps between the templates to the surface development diagram of the special-shaped component according to the architectural drawings.

8. The method for constructing a narrow space thin-walled wall structure according to claim 6, characterized in that: The cushion block and the filling body unit in S2 form an integrated prefabricated module.

9. The method for constructing a narrow space thin-walled wall structure according to claim 6, characterized in that: In S4, the edges of the processed template are polished and sealed with water, the cut templates are stacked on the processing table according to the assembly order, and the adjacent unit blocks are clamped, and then the template joints are sealed with glass glue; After the template joints are closed, the secondary purlins are installed and fixed with angle brackets. Holes are opened at the two outermost secondary purlins to set lifting holes.

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