A disassembly-free composite heat preservation formwork outer wall formwork reinforcing construction method

Abstract

This invention discloses a construction method for reinforcing exterior walls using a non-removable composite thermal insulation formwork, belonging to the field of building construction technology. Addressing issues such as joint leakage and misalignment, poor waterproofing in underground engineering, and problems with exterior facade decoration caused by traditional reinforcement systems, this invention proposes a method using lightweight steel formwork to press vertical joints as secondary ribs (40mm×40mm×3mm galvanized square steel pipes welded to 3mm galvanized steel plates), with two main steel pipe ribs (50mm×50mm×3mm galvanized square steel pipes welded to L50×5 angle steel) to enhance overall rigidity. Interlayer K-plates (perforated at 150mm intervals) constrain deformation, and pre-installed support formwork boxes and unloading reinforcement bars bear the formwork's self-weight. During first-floor construction, the K-plate components on the top of the basement level also serve as formwork supports, and the support formwork boxes provide a working surface for subsequent waterproofing. Compared to traditional timber reinforcement systems, this method increases first-floor formwork erection speed by over 10%, reduces leakage and misalignment by over 95%, and reduces costs by over 30%. Furthermore, this technology is applicable to integrated formwork and insulation exterior wall construction, combining efficiency, precision, and economy.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a construction method for reinforcing exterior walls using non-removable composite thermal insulation formwork. Background Technology

[0002] The problem of severe grout leakage and misalignment at the vertical and interlayer joints of the non-removable thermal insulation formwork: The traditional external wall reinforcement system uses square steel or φ48.3mm×3.5mm steel pipes as the main ribs and timber as the secondary ribs. Due to the low strength of the non-removable formwork, it is impossible to temporarily fix the vertical timber. Using flat timber will result in insufficient rigidity of the reinforcement system, and the inconsistent size of the timber will further reduce the reinforcement effect, thus leading to severe grout leakage and misalignment at the joints.

[0003] The problem of poor waterproofing and poor exterior decoration of attached full or semi-underground projects using non-removable insulated formwork for building exterior walls: According to Appendix A, Figure A.0.2.2-2 of the "Technical Specification for Application of Non-removable Composite Insulated Formwork for Buildings" (JC / T60016-2022), a concrete cantilever should be set at the plinth of the basement exterior wall to support the non-removable insulated formwork, and its elevation should be at least 500mm lower than the outdoor drainage. However, Article 3.1.3 (mandatory clause) of the "Technical Specification for Waterproofing of Underground Engineering" (GB 50108-2008) stipulates that the waterproofing design height of attached full or semi-underground projects should be at least 500mm higher than the outdoor ground level. With both standards in effect, the waterproof membrane for basement exterior walls must be laid for at least 1000mm and the joints must be sealed on a low-strength, non-removable insulation formwork. Waterproof membranes above the outdoor ground level without insulation board protection are prone to damage and aging, and will affect the exterior facade decoration. Concrete cantilevered platforms on the basement exterior walls will increase the need for suspended formwork, and the self-waterproofing effect of the concrete at the suspended formwork location is poor. Summary of the Invention

[0004] By using light steel formwork to press the vertical joints as secondary ribs, and the main ribs of the two steel pipes to enhance the overall rigidity, the problem of grout leakage and misalignment at the vertical joints is reduced by more than 95%. The K-plate constrains the misalignment between layers by more than 90%. Combined with the pre-set support formwork and unloading steel bars, the waterproof working surface is reserved and the formwork is supported by its own weight, ultimately solving the problems of misalignment, grout leakage, waterproofing, and decoration. Attached Figure Description

[0005] Figure 1 : Schematic diagram of standard floor exterior wall formwork reinforcement, showing the installation positions of light steel formwork (secondary ribs), double steel pipe main ribs and K-plates; In the diagram: 1—K-plate assembly embedded in this floor, 2—double steel pipe main ribs, 3—light steel formwork (secondary ribs), 4—K-plate assembly embedded in the previous floor, 5—corner lock of double steel pipe main ribs.

[0006] Figure 2: Schematic diagram of the first-floor formwork reinforcement, showing the connection relationship between the supporting formwork box, the unloading steel bars and the K-plate; In the diagram: 6—K-plate nut embedded on the first basement floor, 7—K-plate assembly, 8—unloading steel bars, 9—supporting formwork box.

[0007] Figure 3 Detailed drawing of the welded structure of light steel formwork, including the welding method of galvanized square steel pipe and galvanized steel plate; in the drawing: 10-40mm×40mm×3mm galvanized square steel pipe, 11-3mm galvanized steel plate.

[0008] Figure 4 : Detailed drawing of the main rib connection structure of the two steel pipes, showing the welding process of the two square steel pipes and the angle steel; In the drawing: 12—angle steel, 13—galvanized square steel pipe of 50mm×50mm×3mm.

[0009] Figure 5 : K-plate structural details, including the spacing of the holes in the galvanized square steel pipe (150mm) and welding details; In the figure: 14—embedded nut, 15—16mm diameter threaded rod (length matches the insulation board), 16—60mm×60mm×5mm steel washer, 17—threaded rod hole. Detailed Implementation

[0010] The construction method and equipment for the formwork reinforcement of the first-floor exterior wall include the following steps: Step S1, detailed design of the non-removable formwork and light steel formwork reinforcement system; Step S2, standardized processing and manufacturing of light steel formwork, main steel pipes on both sides, K-plates and supporting formwork boxes by the manufacturer. The light steel formwork uses 40mm×40mm×3mm galvanized square steel pipes and 3mm thick galvanized steel plates welded together (see attached). Figure 3 The main ribs of both sides are made of two 50mm×50mm×3mm galvanized square steel pipes and L50mm×5mm angle steel welded together, and are processed according to the wall dimensions (see attached). Figure 4 K-plate is made of 40mm×40mm×3mm galvanized square steel pipe and 3mm thick galvanized steel plate, welded together and perforated at 150mm intervals (see attached). Figure 5 The supporting formwork box is made of template or metal material with the same thickness as the non-removable insulation template. Step S3: Use bolts that match the thickness of the exterior wall template of the basement structure to pre-embed positioning nuts for the basement top K plate. Step S4: Use bolts that match the thickness of the non-removable insulation board to install the K plate, place the supporting formwork box on the bolts, place the unloading reinforcement on the top of the formwork box, tie one end to the reinforcement inside the wall, and place the other end flat on the top of the formwork box and flush with the outer edge of the non-removable template; Step S5: Hoist the non-removable template and install the pre-set anchors; Step S6: Install the light steel template; Step S7: Install tie bolts, double steel pipe main ribs, and reinforce the template as a whole; Step S8: Install the first floor top K plate; Step S9: Inspection and acceptance, concrete pouring.

[0011] The construction method for formwork reinforcement of standard floor exterior walls includes the following steps: Step S1, binding of wall and column reinforcement and setting up of inner formwork; Step S2, hoisting of formwork without dismantling and installation of pre-installed anchors; Step S3, installation of light steel formwork; Step S4, installation of tie bolts, main steel pipes on both sides, and overall reinforcement of formwork; Step S5, installation of the top K slab of this floor; Step S6, inspection and acceptance, and concrete pouring.

Claims

1. A construction method for reinforcing exterior walls using non-removable composite thermal insulation formwork, characterized in that: Includes the following steps: Step S1: Conduct detailed design of the non-removable formwork and light steel formwork reinforcement system; Step S2: Fabricate light steel formwork, main ribs of double steel pipes, K-plate and supporting mold box. The light steel formwork is welded from 40mm×40mm×3mm galvanized square steel pipes and 3mm thick galvanized steel plates. The main ribs of double steel pipes are welded from two 50mm×50mm×3mm galvanized square steel pipes and L50mm×5mm angle steel. Step S3: Pre-embed positioning nuts for the top K plate of the first basement level; Step S4: Install the K-plate and support formwork. Place the unloading steel bars on the top of the formwork, with one end tied to the steel bars inside the wall and the other end laid flat on the top of the formwork and flush with the outer edge of the non-removable formwork. Steps S5-S9: Hoisting of formwork without dismantling, installation of light steel formwork, reinforcement of main steel pipes on both sides, installation of the first floor roof K-slab and concrete pouring.

2. A non-removable composite thermal insulation formwork external wall support and reinforcement device, characterized in that, include: Light steel formwork (made of 40mm×40mm×3mm galvanized square steel pipe and 3mm thick galvanized steel plate welded together); Main steel pipe ribs on both sides (two 50mm×50mm×3mm galvanized square steel pipes welded together with L50mm×5mm angle steel); Interlayer K-plate (40mm×40mm×3mm galvanized square steel pipe with holes punched at 150mm intervals); Supporting mold box (a metal or template box of the same thickness as the non-removable template, which provides a working surface for the waterproof layer after demolding).

3. The method according to claim 1, characterized in that, The unloading reinforcement uses HRB400 threaded steel with a diameter of 22mm, and the binding and fixing spacing is ≤200mm.

4. The apparatus according to claim 2, characterized in that, The vertical joints of the light steel formwork are fitted with 3mm thick galvanized steel strips, and the width of the strips is ≥200mm.

5. The method or apparatus according to claim 1 or 2, characterized in that, The top elevation of the supporting mold box is 500mm above the outdoor ground level, with an error of ≤2mm.

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