Narrow space structure plate top-down method formwork structure and construction method

Abstract

The application provides a narrow space structure plate reverse construction method demolding-free structure and a construction method, and relates to the technical field of building engineering construction. The demolding-free structure comprises a lower structure plate and an upper structure plate, a structure beam formwork is arranged between the lower structure plate and the upper structure plate, a first supporting assembly is arranged at the bottom of the lower structure plate, a second supporting assembly is arranged between the lower structure plate and the upper structure plate, and a third supporting assembly is arranged between the structure beam formwork and the lower structure plate. The construction method comprises the following steps: S1, construction preparation, S2, lower structure construction, S3, upper structure construction, S4, removal of the supporting system, S5, mechanical and electrical installation, S6, installation of a steel bar truss floor support plate, and S7, installation of an upper plate steel bar installation plate. The application solves the problems of peculiar smell and termite breeding caused by the accumulation of perishable materials in the structure cavity, adopts the reverse construction method, shortens the construction period, speeds up the time of capping the upper structure of the main body, and improves the construction quality.

Description

Technical Field

[0001] This application relates to the field of building construction technology, and more specifically, to a reverse construction method for a narrow space structural slab without formwork removal and a construction method thereof. Background Technology

[0002] Narrow space structural slabs have the characteristics of noise reduction and insulation, heat reduction and heat insulation, and energy saving. The gap between the upper and lower floor slabs can also be used for the laying of water and electricity pipelines, which facilitates construction and saves construction costs. They can also improve the load-bearing capacity of the floor slabs, enable the interior space to achieve a large span shape, improve the visual effect of the interior space, and have the advantages of reasonable structure, overall beauty, and full utilization of interior space.

[0003] For structural slabs in confined spaces, such as double-layer slabs with a height of 1.1 meters or 1.2 meters, construction is difficult, formwork is hard to erect, the upper slab forms a closed space after pouring, the formwork cannot be removed and cleaned, and there are often pipelines such as fire sprinkler systems distributed in the inner layer, making the construction process complicated.

[0004] In traditional narrow space structural panel construction, the installation of wooden boxes or the construction of upper and lower panels in a bottom-up order is often adopted. However, conventional methods of using formwork and wooden blocks to support the upper structural panels often cannot be removed after construction, which can lead to problems such as wood rot and insect infestation. In addition, the installation of wooden boxes is also prone to floating, resulting in insufficient panel thickness and other drawbacks. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a reverse construction method for narrow space structural panels that eliminates the need for formwork removal and a construction method thereof.

[0006] Firstly, this application provides a reverse construction method for a narrow-space structural panel without formwork removal, employing the following technical solution:

[0007] A reverse construction method for a narrow space structural slab without formwork removal includes a lower structural slab and an upper structural slab. A structural beam template is provided between the lower and upper structural slabs. A first support component is provided at the bottom of the lower structural slab. A second support component is provided between the lower and upper structural slabs. A third support component is provided between the structural beam template and the lower structural slab.

[0008] Optionally, the lower structure plate includes a lower structure body, a lower structure template, a first rib, and a first main rib arranged from top to bottom; the first support component includes a first support structure, a first bottom support, and a first top support, the bottom of the first top support is connected to the first support structure, and the other end is connected to the first main rib, and the first bottom support is disposed below the first support structure.

[0009] Optionally, the upper structure plate includes an upper structure body, an upper structure template, a second rib, and a second main rib arranged from top to bottom; the second support component includes a second support structure, a second bottom support, and a second top support, the bottom of the second top support is connected to the second support structure, and the other end is connected to the second main rib; the second bottom support is disposed on the lower structure body, and the second bottom support is connected to the bottom of the second support structure.

[0010] Optionally, the structural beam formwork includes an upper formwork, a shear wall formwork, and a lower formwork arranged from top to bottom. The upper formwork is located below the second main beam, the lower formwork is located above the lower structure, and the shear wall formwork is located between the upper and lower formworks. The third support component includes tie rods, a first diagonal brace, and a second diagonal brace. Tie rods are provided through the upper formwork, the shear wall formwork, and the lower formwork. One end of the first diagonal brace is connected to the lower structure, and the other end is connected to the lower formwork. One end of the second diagonal brace is connected to the lower structure, and the other end is connected to the shear wall formwork.

[0011] On the other hand, this application also provides a reverse construction method for structural slabs in narrow spaces without formwork removal, which adopts the following technical solution:

[0012] A reverse construction method for structural slabs in narrow spaces without formwork removal includes the following steps: S1, construction preparation, including system design verification, determination of bottom formwork parameters, design of steel truss slab layout, design of detailed node drawings, and setting of temporary supports; S2, lower structure construction, including erection of lower structure slab support frames, fabrication and installation of lower structure formwork, fabrication and installation of support structures, pouring and molding of the lower structure, and pouring and molding of the lower structure beams; S3, upper structure construction, including erection of full-span scaffolding, erection of two-way horizontal bars, fabrication and installation of upper structure formwork, fabrication and installation of support structures, pouring and molding of shear walls, pouring and molding of upper structure beams, and pouring and molding of the upper structure; S4, dismantling of the support system, including dismantling of column and wall formwork, dismantling of beam side formwork, dismantling of floor slab formwork, and dismantling of beam bottom formwork; S5, electromechanical installation, including installation of water supply and drainage pipes, laying of electrical wiring, installation of fire protection pipes, and pipe pressure testing; S6, installation of steel truss floor deck slabs; S7, installation of upper slab reinforcement.

[0013] Optionally, the construction of the lower structure includes: before the construction of the lower structure, measuring and setting the edge lines of the beams of the lower structure; after the lower structure formwork is laid, measuring and setting the edge lines of the beams on the lower structure formwork; measuring and setting the positioning lines of the inspection holes and the embedded points of the electromechanical installation on the lower structure formwork; and measuring and setting the elevation control lines.

[0014] Optionally, the construction of the lower structure includes: the joint of the lower structure template is no more than 1mm, the height difference between adjacent lower structure template surfaces is no more than 1mm; the cut surfaces of the lower structure template are sealed with a primer, and the template surface is coated with a water-based release agent.

[0015] Optionally, the construction of the lower structure includes: the formwork construction of the lower structural beams and the lower hanging plate, the welding of supporting steel bars at the bottom, the bracing on both sides of each lower structural beam, the welding of steel bar supports for the diagonal bracing on the lower layer steel bar of the floor slab, and the installation of diagonal bracing on the outer formwork for support and reinforcement.

[0016] Optionally, the dismantling of the support system includes: loosening the main keel fasteners, removing the main keel, and then removing the secondary keel; conducting strength tests on concrete test blocks of the upper structural beams, lower structural beams, and shear walls cured under the same conditions, and removing the beam formwork once the strength of the concrete test blocks cured under the same conditions reaches the demolding requirements.

[0017] Optionally, the electromechanical installation includes: numbering the prefabricated pipes according to their installation locations, then transporting the pipes to the installation locations according to their numbers, installing the main pipes first and then the branch pipes, with a net distance between the pipes greater than 100mm.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. By adopting reverse construction and formwork removal technology, the drawbacks of non-recyclable materials such as timber and formwork in the mezzanine are avoided, saving a large amount of turnover materials. The quality of concrete molding is significantly improved, saving manpower and material resources, and the application effect is good.

[0020] 2. Only after pressure testing and other inspections are completed without any issues will the next process begin, effectively ensuring construction quality. Using steel truss floor slabs as the upper slab structure enables prefabricated construction, reducing quality deviations in rebar spacing and row spacing, improving concrete surface quality, and enhancing the working environment and safety. It eliminates the need for personnel to work in enclosed, narrow spaces, avoiding safety hazards such as working in confined spaces.

[0021] 3. It saves on construction time, reduces the input of manpower and materials, avoids the one-time investment costs of reusable materials such as timber and formwork, and significantly reduces construction costs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the construction structure of the lower layer in an embodiment of this application;

[0024] Figure 2 for Figure 1 Enlarged view of part A in the image;

[0025] Figure 3 This is a schematic diagram of the construction structure of the superstructure according to an embodiment of this application;

[0026] Figure 4 for Figure 3 Enlarged view of part B in the image;

[0027] Figure 5 This is a schematic diagram of the overall structure after the support system has been removed in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the overall structure after electromechanical installation according to an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of the overall structure of the steel truss floor deck after installation, according to an embodiment of this application.

[0030] Icons: 1. Lower structural slab; 11. Lower structure; 12. Lower structural formwork; 13. First joist; 14. First main joist; 2. Upper structural slab; 21. Upper structure; 22. Upper structural formwork; 23. Second joist; 24. Second main joist; 3. Structural beam formwork; 31. Upper formwork; 32. Shear wall formwork; 33. Lower formwork; 4. First support assembly; 41. First support structure; 411. First horizontal bar; 412. First vertical bar; 42. First bottom support; 43. First top support; 5. Second support assembly; 51. Second support structure; 511. Second horizontal bar; 512. Second vertical bar; 52. Second bottom support; 53. Second top support; 6. Third support assembly; 61. Tie rod; 62. First diagonal brace; 63. Second diagonal brace; 7. Pipe; 8. Steel truss floor deck. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0033] Example

[0034] On the one hand, this application discloses a reverse construction method for a narrow space structural plate without the need for demolding.

[0035] Reference Figure 1 , 23. A narrow space structural slab reverse construction method without formwork removal structure, including a lower structural slab 1 and an upper structural slab 2, a structural beam template 3 is provided between the lower structural slab 1 and the upper structural slab 2, a first support component 4 is provided at the bottom of the lower structural slab 1, a second support component 5 is provided between the lower structural slab 1 and the upper structural slab 2, and a third support component 6 is provided between the structural beam template 3 and the lower structural slab 1.

[0036] Among them, reference Figure 1 , 2 The lower structure plate 1 includes a lower structure body 11, a lower structure template 12, a first rib 13, and a first main rib 14 arranged from top to bottom.

[0037] As one embodiment of this application, refer to Figure 2 The first main rib 14 includes two steel pipes, which are arranged side by side and installed side by side through a fixed mounting plate. The bottom of the fixed mounting plate is connected to the top of the first support component 4.

[0038] Reference Figure 1 The first support component 4 includes a first support structure 41, a first bottom support 42 and a first top support 43. The bottom of the first top support 43 is connected to the first support structure 41 and the other end is connected to the first main rib 14. The first bottom support 42 is located below the first support structure 41.

[0039] As one embodiment of this application, refer to Figure 1 The first support structure 41 includes a first horizontal bar 411 and a first vertical bar 412. Multiple first horizontal bars 411 and first vertical bars 412 are provided, and the first horizontal bars 411 and first vertical bars 412 are arranged perpendicularly to each other.

[0040] Reference Figure 3 , 4 The upper structure plate 2 includes an upper structure body 21, an upper structure template 22, a second rib 23, and a second main rib 24 arranged from top to bottom.

[0041] As one embodiment of this application, refer to Figure 4 The second main rib 24 includes two steel pipes arranged side by side and installed side by side through a fixed mounting plate. The bottom of the fixed mounting plate is connected to the top of the second support component 5.

[0042] Reference Figure 3 The second support component 5 includes a second support structure 51, a second bottom support 52, and a second top support 53. The bottom of the second top support 53 is connected to the second support structure 51, and the other end is connected to the second main rib 24. The second bottom support 52 is disposed on the lower structure 11, and the second bottom support 52 is connected to the bottom of the second support structure 51.

[0043] As one embodiment of this application, refer to Figure 3 The second support structure 51 includes a second horizontal bar 511 and a second vertical bar 512. Multiple second horizontal bars 511 and multiple second vertical bars 512 are provided. The second horizontal bars 511 and the second vertical bars 512 are arranged perpendicularly to each other.

[0044] Reference Figure 3 The structural beam formwork 3 includes an upper formwork 31, a shear wall formwork 32, and a lower formwork 33 arranged from top to bottom. The upper formwork 31 is located below the second main rib 24, the lower formwork 33 is located above the lower structure 11, and the shear wall formwork 32 is located between the upper formwork 31 and the lower formwork 33.

[0045] As one embodiment of this application, refer to Figure 1 , 3 The third support component 6 includes tie rods 61, a first diagonal brace 62, and a second diagonal brace 63. Tie rods 61 are installed through the upper template 31, the shear wall template 32, and the lower template 33. One end of the first diagonal brace 62 is connected to the lower structure, and the other end is connected to the lower template 33. One end of the second diagonal brace 63 is connected to the lower structure, and the other end is connected to the shear wall template 32.

[0046] On the other hand, this application also discloses a reverse construction method for structural slabs in narrow spaces without the need for formwork removal.

[0047] A reverse construction method for structural slabs in narrow spaces without formwork removal includes the following steps:

[0048] S1. Construction preparation, including system design verification, determination of bottom formwork parameters, design of steel truss slab layout, design of detailed node drawings, and installation of temporary supports; S2. Lower structure construction, including erection of lower structure slab 1 support frame, fabrication and installation of lower structure formwork 12, fabrication and installation of support structure, pouring and molding of lower structure 11, and pouring and molding of lower structure beams; S3. Upper structure construction, including erection of full-span scaffolding, erection of two-way horizontal bars, fabrication and installation of upper structure formwork 22, fabrication and installation of support structure, pouring and molding of shear walls, pouring and molding of upper structure beams, and pouring and molding of upper structure; S4. Removal of support system, including removal of column and wall formwork, removal of beam side formwork, removal of floor slab formwork, and removal of beam bottom formwork; S5. Mechanical and electrical installation, including installation of water supply and drainage pipes 7, laying of electrical wiring, installation of fire protection pipes 7, and pressure testing of pipes 7; S6. Installation of steel truss floor deck 8; S7. Installation of upper slab reinforcement.

[0049] Reference Figure 1The construction of the lower structure includes: before the construction of the lower structure, measuring and setting the edge lines of the beams of the lower structure to facilitate the erection of formwork supports according to the beam lines; after the lower structure formwork 12 is laid, measuring and setting the edge lines of the beams on the lower structure formwork 12 to facilitate construction according to the drawings and improve construction accuracy; measuring and setting the positioning lines of inspection holes and the embedded points of electromechanical installation on the lower structure formwork 12; measuring and setting the elevation control lines.

[0050] The construction of the lower structure also includes: the joint of the lower structure formwork 12 is no more than 1mm, and the height difference between the surfaces of adjacent lower structure formwork 12 is no more than 1mm, so as to ensure that the formwork arches according to the design requirements; the cut surfaces of the lower structure formwork 12 are sealed with a primer, and the surface of the formwork is coated with a water-based release agent.

[0051] The lower structural beams and lower hanging plates are constructed by measuring and molding, with supporting steel bars welded at the bottom. Each lower structural beam is supported on both sides, and steel supports for diagonal bracing are welded to the lower layer of steel reinforcement in the floor slab. Diagonal bracing is installed on the outer formwork for support and reinforcement.

[0052] In actual construction, when the bottom of the frame beam is flush with the bottom of the lower structural slab 1, the bottom reinforcement of the slab should pass through the first row of longitudinal reinforcement at the bottom of the beam. 5. If the lower slab is a hanging slab under the beam, since the bottom of the beam and the slab surface are not directly connected, but connected through the hanging slab, to ensure the quality of concrete pouring, the designed hanging slab can be widened to the same width as the beam, while the reinforcement remains unchanged.

[0053] Reference Figure 3 When constructing the superstructure, as one implementation method of this application, the superstructure in the narrow space structural slab area has the same construction requirements as other parts of the main structure. When erecting full-span scaffolding, the upper and lower uprights must be aligned, and the uprights should be uniformly arranged starting 300cm outside the wall beam. Two-way horizontal bars must be fully installed between the beam support frame and the full-span scaffolding uprights at each step distance to ensure sufficient design stiffness in both directions. To increase the bearing area of ​​the upright bottom and ensure uniform stress distribution, even if the upright load is relatively evenly distributed on the floor and transferred to the lower floor slab, wooden blocks (preferably arranged along the entire length) should be laid at the bottom of the uprights; the uprights must not be placed directly on the floor slab.

[0054] At a height not exceeding 550mm from the ground, horizontal bracing should be installed in a longitudinal and transverse order, starting from the bottom and ending at the top. The distance between the horizontal bracing and the top tie rod should be evenly distributed to determine the step distance, provided it meets the horizontal tie rod spacing requirements specified in the formwork design. At each step distance, one horizontal tie rod should be installed in both the longitudinal and transverse directions. Components such as scissor bracing and safety nets should be arranged according to the site conditions. After the formwork installation is completed, the upper reinforcement, water and electricity pre-embedded parts, etc., should be constructed, and the upper layers should be constructed sequentially.

[0055] Reference Figure 5The dismantling of the support system includes: loosening the main keel fasteners, removing the main keel, and then removing the secondary keel; conducting strength tests on concrete test blocks of the upper structural beams, lower structural beams, and shear walls cured under the same conditions; and removing the beam formwork once the strength of the concrete test blocks cured under the same conditions reaches the demolding requirements.

[0056] Reference Figure 6 The electromechanical installation includes: numbering the prefabricated pipes 7 according to their installation positions, then transporting the pipes 7 to their installation positions according to their numbers, installing the main pipes first and then the branch pipes. As one embodiment of this application, the net distance between the pipes 7 is greater than 100mm. As another embodiment of this application, the net distance between the pipes 7 is set according to the actual construction design requirements.

[0057] When pipe 7 is laid in parallel, the stainless steel pipe should preferably be placed inside the galvanized steel pipe. When pipe 7 crosses structural expansion joints, seismic joints, and settlement joints, protective measures should be taken as appropriate, such as flexible connections on both sides of the wall, square compensators at the wall penetration point, and horizontal installation.

[0058] Reference Figure 7 When installing the steel truss floor deck 8, since the main function of the steel truss floor deck 8 is to replace the bottom formwork of the beam, its strength and rigidity should meet the requirements of the self-weight of the materials and the bearing capacity of the construction live load of the superstructure. The floor deck support angle steel is installed, and short steel bars are fixed to the side of the beam with a spacing of no more than 600mm.

[0059] In one embodiment of this application, the floor decking slabs are overlapped, and the overlaps are sealed with double-sided tape. The floor decking slabs and supporting angle steel are also sealed with double-sided tape. The gaps between the angle steel and the beam and wall sides are filled tightly with absorbent materials such as expanding agents and PE rods to prevent grout leakage.

[0060] The bottom reinforcement of the floor slab is laid out parallel to the longitudinal reinforcement of the steel truss, at the same height. Perpendicular to the longitudinal reinforcement of the steel truss, the reinforcement is erected above the longitudinal reinforcement of the steel truss. The installation requirements for the negative reinforcement of the floor slab are the same as for the bottom reinforcement. The negative reinforcement parallel to the longitudinal reinforcement of the steel truss is installed on the surface, while the negative reinforcement in the other direction should be installed at the bottom. The slab reinforcement is fully tied at the intersection with the steel truss, and one path of slab reinforcement on each side of the longitudinal reinforcement of the steel truss is fully tied. Acceptance is conducted after the reinforcement installation is completed.

[0061] The implementation principle of the reverse construction method for a narrow space structural slab without the need for formwork removal and the construction method thereof in this application is as follows:

[0062] In narrow-space structural slabs, the lower floor slabs primarily serve decorative and load-bearing functions, while the upper floor slabs act as floor planes and bear floor loads. Structural beams connect the upper and lower floor slabs to form a unified structure, enabling it to withstand significant loads. Based on these construction characteristics, the lower floor slab is constructed first, leaving a horizontal construction joint at the bottom of the upper floor slab; the upper floor slab is not constructed at this stage. The upper main structure is constructed first, and after the formwork support system for this floor is removed, the upper floor slab structure is constructed using a method of installing angle steel to fix the steel truss floor deck slab 8. This eliminates the need for vertical formwork, meeting construction quality and schedule requirements. The floor deck slab bottom formwork has good mechanical properties; retaining this component allows it to share the load with the upper cast-in-place concrete structure, contributing to improved structural safety. Ample time is allocated for the installation of complex pipelines in the upper and lower structural slabs 1, and segmented testing and acceptance are conducted before concealed construction to prevent water leakage from pipes 7. Meanwhile, the use of foam adhesive or PE rods to fill the joints between the steel truss floor slabs and structural beams effectively prevents grout leakage and improves the quality of concrete forming.

[0063] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for constructing a structural slab in a narrow space using a reverse construction method without formwork removal, characterized in that: The structure includes a lower structural slab and an upper structural slab. A structural beam template is provided between the lower and upper structural slabs. A first support component is provided at the bottom of the lower structural slab. A second support component is provided between the lower and upper structural slabs. A third support component is provided between the structural beam template and the lower structural slab. The lower structural slab includes, from top to bottom, a lower structural body, a lower structural template, a first rib, and a first main rib. The upper structural slab includes, from top to bottom, an upper structural body, an upper structural template, a second rib, and a second main rib. The structural beam template includes, from top to bottom, an upper template, a shear wall template, and a lower template. The upper template is located below the second main rib, the lower template is located above the lower structural body, and the shear wall template is located between the upper and lower templates. A reverse construction method for structural slabs in narrow spaces without formwork removal includes the following steps: S1. Construction preparation; S2. Substructure construction, including the erection of substructure slab support frame, fabrication and installation of substructure formwork, fabrication and installation of support structure, pouring and molding of substructure body, and pouring and molding of substructure beams; S3. Construction of the superstructure, including erection of full-span scaffolding, erection of two-way horizontal bars, fabrication and installation of superstructure formwork, fabrication and installation of supporting structures, pouring and molding of shear walls, pouring and molding of superstructure beams, and pouring and molding of the superstructure body. S4. Remove the support system, including removing the column and wall formwork, beam side formwork, floor slab formwork, and beam bottom formwork; S5. Perform electromechanical installation on the lower structural slab, including water supply and drainage pipe installation, electrical wiring laying, fire protection pipe installation, and pipe pressure testing; S6. Install steel truss floor decking between adjacent substructure beams; including installing floor decking support angle steel, using short steel bars spaced no more than 600mm and fixed to the side of the beam; S7. Install the steel reinforcement of the steel truss floor slab and pour concrete.

2. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 1, is characterized in that: The first support component includes a first support structure, a first bottom support, and a first top support. The bottom of the first top support is connected to the first support structure, and the other end is connected to the first main rib. The first bottom support is disposed below the first support structure.

3. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 2, is characterized in that: The second support component includes a second support structure, a second bottom support, and a second top support. The bottom of the second top support is connected to the second support structure, and the other end is connected to the second main rib. The second bottom support is disposed on the lower structure and is connected to the bottom of the second support structure.

4. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 3, is characterized in that: The third support component includes tie rods, a first diagonal brace, and a second diagonal brace. Tie rods are provided through the upper template, shear wall template, and lower template. One end of the first diagonal brace is connected to the lower structure, and the other end is connected to the lower template. One end of the second diagonal brace is connected to the lower structure, and the other end is connected to the shear wall template.

5. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 1, is characterized in that... The construction of the lower structure includes: Before the construction of the lower structure, the edge lines of the beams of the lower structure are measured and set; after the formwork of the lower structure is laid, the edge lines of the beams are measured and set on the formwork of the lower structure; the positioning lines of the inspection holes and the embedded points of the electromechanical installation are measured and set on the formwork of the lower structure; and the elevation control lines are measured and set.

6. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 1, is characterized in that... The construction of the lower structure includes: The joints of the lower structure templates shall not exceed 1mm, and the height difference between adjacent lower structure template surfaces shall not exceed 1mm; the cut surfaces of the lower structure templates shall be sealed with a primer, and the template surfaces shall be coated with a water-based release agent.

7. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 1, is characterized in that... The construction of the lower structure includes: For the side formwork construction of the lower structural beams and the lower hanging plate, the bottom support steel bars are welded, and each lower structural beam is supported on both sides. The steel bar support brackets for the diagonal bracing are welded on the lower layer steel bar mesh of the floor slab, and diagonal bracing is set on the outer formwork frame for support and reinforcement.

8. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 1, is characterized in that... The dismantling of the support system includes: Loosen the main keel fasteners, remove the main keel, and then remove the secondary keel; Strength tests were conducted on concrete test blocks of the superstructure beams, substructure beams, and shear walls cured under the same conditions. Once the strength of the concrete test blocks cured under the same conditions reached the demolding requirements, the beam formwork was removed.

9. The method for constructing a narrow space structural slab using a reverse construction method without formwork removal, as described in claim 1, is characterized in that... Electromechanical installation includes: Prefabricated pipes are numbered according to their installation locations, and then transported to the installation locations according to their numbers. Main pipes are installed first, followed by branch pipes, with a net distance of more than 100mm between pipes.

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