A method for reinforcing precast hollow floor with light steel keel hanging wire

Abstract

The application provides a prefabricated hollow floor reinforcing light steel keel hanging wire construction method, which comprises the following steps: removing the original prefabricated hollow floor decoration surface layer, cleaning and then reinforcing with carbon fibers; positioning and drilling holes at the joints of the prefabricated hollow floor; inserting T-shaped steel bars into the holes and fixing the T-shaped steel bars; blocking the lower opening of the holes with a foaming agent, treating the holes with fine stone concrete, and newly constructing a new decoration surface layer above the prefabricated hollow floor; welding the upper end of the hanging wire to the lower end of the T-shaped steel bar, and connecting the lower end of the hanging wire to the main keel of the light steel keel system. The application completes the suspended ceiling construction without damaging the existing reinforced carbon fiber material, guarantees the effective play of the original reinforcing effect, reduces the amount of steel structure, lightens the overall load of the reconstructed building, optimizes the fixing mode of the hanging wire, ensures the reliability and stability of the connecting joint, and solves the technical problem of installing the light steel keel paper-faced gypsum board suspended ceiling in the prefabricated hollow floor structure.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to a method for constructing light steel keel reinforcement after reinforcing precast hollow floor slabs. Background Technology

[0002] Buildings using precast hollow core slabs as their floor structure experience varying degrees of structural aging and degradation over time. Simultaneously, with the ongoing deepening of urban renewal, the functional requirements of existing buildings are constantly being adjusted and upgraded, necessitating renovation, functional replacement, and quality upgrades.

[0003] When performing ceiling decoration on such buildings, in order to meet the current code requirements for structural safety, it is usually necessary to first reinforce the precast hollow floor slabs with carbon fiber to enhance their load-bearing capacity and overall integrity. Based on this, to balance the aesthetics of the interior space, construction efficiency, and functionality, lightweight steel keel gypsum board ceilings have become the mainstream choice for ceiling decoration.

[0004] However, in conventional light steel keel ceiling construction, the suspension rods are mostly directly connected to the bottom of the floor slab using expansion bolts to achieve reliable fixation of the suspension system. But in buildings using precast hollow core slabs, the floor slabs have continuous hollow internal structures, and after carbon fiber reinforcement, the structural shape of the bottom of the floor slab has changed. In this case, expansion bolts are unlikely to form effective anchoring force in the hollow areas. Forced construction may not only damage the original structure and carbon fiber reinforcement layer, but also result in unreliable connections and insufficient safety, making traditional fixing methods unsuitable.

[0005] In existing construction, some methods use channel steel to set up a transfer layer or special lifting equipment in conjunction with embedded parts for hoisting, but these methods have the following drawbacks:

[0006] The strength of the bond between the suspension rods and the slab is difficult to assess, posing a safety hazard.

[0007] Using channel steel and angle steel to set up the transfer layer increases the amount of steel used and raises the construction cost.

[0008] Therefore, how to establish a safe, reliable, and suitable new ceiling fixing system for this type of building without compromising the structural integrity of the precast hollow slab and the reinforcement effect of carbon fiber has become a key technical problem that urgently needs to be solved in the renovation and decoration of existing buildings. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a method for constructing light steel keel suspension rods after reinforcing precast hollow floor slabs. This method effectively controls the bonding strength between the suspension rods and the slab, reduces steel consumption, lowers costs, and solves the construction problem of light steel keel suspension rods for precast hollow floor slabs.

[0010] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0011] A method for constructing light steel keel reinforcement bars after reinforcing precast hollow core slabs includes the following steps:

[0012] Step 1: Remove the original precast hollow core slab decorative surface layer and clean it, then carry out carbon fiber reinforcement treatment;

[0013] Step 2: Locate the lifting points and drill holes in the joints of the precast hollow core slabs;

[0014] Step 3: Insert the T-shaped steel bar vertically into the reserved hole set in Step 2, and temporarily fix it to the precast hollow floor slab using special clips;

[0015] Step 4: Seal the bottom of the hole with foaming agent, fill the hole with fine stone concrete, and re-construct a new decorative surface layer on top of the precast hollow floor slab.

[0016] Step 5: Connect the T-shaped steel bars to the light steel keel system using hanger bars.

[0017] Furthermore, in step 1, when performing carbon fiber reinforcement, each precast hollow floor slab is treated as an independent unit, and two layers of carbon fiber cloth are pasted on its surface.

[0018] Furthermore, the diameter of the holes drilled in step 2 is matched with the T-shaped steel bars, the spacing between the holes is controlled within 1.2m, and it is ensured that the holes penetrate the precast hollow floor slab.

[0019] Furthermore, in step 4, a new decorative surface layer is constructed on top of the precast hollow floor slab using fine stone concrete or cement mortar to completely cover the T-shaped steel bars.

[0020] Furthermore, step 5 specifically involves: welding the upper end of the suspension rod to the lower end of the T-shaped steel bar, applying anti-rust coating to the welded area and surrounding area, and connecting the lower end of the suspension rod to the main keel of the light steel keel system to form a complete suspension force transmission system, providing a stable foundation for the subsequent installation of gypsum board.

[0021] The present invention has the following beneficial effects:

[0022] (1) The ceiling construction was completed without damaging the existing carbon fiber reinforcement material, ensuring the integrity and continuity of the carbon fiber reinforcement layer, guaranteeing the effective performance of the original reinforcement effect, and improving the overall safety level of the building structure.

[0023] (2) It effectively solved the technical problem of installing light steel keel paper-faced gypsum board ceiling in prefabricated hollow floor slab structure, overcame the problems of difficult fixing and complex stress in traditional methods, and provided a reliable technical path for the stable installation of ceiling system.

[0024] (3) It reduces the amount of steel structure used, reduces material consumption, and effectively reduces the overall load of the renovated building, which is conducive to the safe operation of the main structure and reflects the advantages of good economy and lightweight structure.

[0025] (4) The fixing method of the suspension rods has been optimized, ensuring the reliability and stability of the connection nodes, effectively improving the overall safety performance of the ceiling system, and reducing the safety risks caused by connection failure. Attached Figure Description

[0026] Figure 1 This is a schematic cross-sectional view of the construction of the light steel keel suspension reinforcement after the precast hollow floor slab is reinforced according to the present invention;

[0027] Figure 2 This is a schematic diagram of the construction plan of the light steel keel suspension reinforcement after the precast hollow floor slab is reinforced according to the present invention;

[0028] In the diagram: 1-T-shaped steel bar; 2-Precast hollow core slab; 3-New decorative surface layer; 4-Main joists; 5-Hanging bars; 6-Secondary joists; Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0030] Reference Figure 1 , 2 As shown, the construction method for reinforcing light steel keel reinforcement of precast hollow floor slabs according to the present invention includes the following process:

[0031] Step 1: Base layer removal and carbon fiber reinforcement;

[0032] First, the decorative surface layer of the original precast hollow core slab 2 was completely removed until the structural layer was fully exposed, ensuring the base layer was solid and free of dust. After removal, the precast hollow core slab 2 was reinforced with carbon fiber according to the design requirements. During reinforcement, each precast hollow core slab 2 was treated as an independent unit, and two layers of carbon fiber cloth were pasted on its surface. The spacing between the carbon fiber cloth and the slab joints was strictly controlled to ensure uniform reinforcement layout, reasonable stress distribution, and to meet the structural reinforcement requirements.

[0033] Step 2: Lifting point positioning and drilling;

[0034] According to the construction layout, suspension points are positioned between the joints of the precast hollow core slab 2. When drilling, the already bonded carbon fiber cloth should be precisely avoided to prevent damage to the reinforcement layer. Using an electric drill, holes are drilled evenly at the positioning points, with the hole diameter matching the T-shaped reinforcing bar 1. The hole spacing is controlled within 1.2m, ensuring that the holes penetrate the precast hollow core slab 2. After drilling, the inside of the holes is thoroughly cleaned to remove debris, loose concrete, and dust, ensuring a clean environment for subsequent fixing.

[0035] Step 3: Installation and temporary fixing of T-shaped steel bar 1;

[0036] T-shaped steel bar 1 is set as a hanging transfer layer. The T-shaped steel bar 1 is vertically inserted into the reserved hole set in step 2 from above the precast hollow floor slab 2. After being adjusted to a vertical state, special clips are used on both sides of the T-shaped steel bar 1 to temporarily fix it to the precast hollow floor slab 2 to ensure that the T-shaped steel bar 1 is in an accurate position and does not deviate, so as to provide a reliable foundation for subsequent welding and force transfer.

[0037] Step 4: Hole sealing and top covering treatment;

[0038] Foaming agent is used to seal the bottom of the hole to prevent leakage of subsequent grouting material; then fine aggregate concrete is used to fill the hole to ensure it is dense and full. After the grouting material has solidified, a new decorative surface layer 3 is reconstructed on top of the precast hollow floor slab 2 using fine aggregate concrete or cement mortar to completely cover the T-shaped steel bars 1, ensuring the integrity of the structure and providing a flat and solid base for the upper floor.

[0039] Step 5: Connection and rust prevention treatment of suspension rod 5;

[0040] After the T-shaped reinforcing bar 1 is installed and fixed, the upper end of the hanger rod 5 is welded to the lower end of the T-shaped reinforcing bar 1. The weld should be firm and accurately aligned. After welding, the welded area and surrounding area are coated with anti-rust paint to ensure the connection node has good durability. The lower end of the hanger rod 5 is reliably connected to the main keel 4 of the light steel keel system (including the main keel 4 and the secondary keel 6) to form a complete hanging force transmission system, providing a stable foundation for the subsequent installation of gypsum board.

[0041] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for constructing light steel keel suspension reinforcement after reinforcing precast hollow core slabs, characterized in that, The process includes the following: Step 1: Remove the original precast hollow floor slab (2) decorative surface layer and clean it, then carry out carbon fiber reinforcement treatment; Step 2: Locate the lifting points and drill holes in the joints of the precast hollow floor slab (2); Step 3: Insert the T-shaped steel bar (1) vertically into the reserved hole set in Step 2, and temporarily fix it to the precast hollow floor slab (2) using special clips; Step 4: Use foaming agent to seal the bottom of the hole, use fine stone concrete to fill the hole, and reconstruct a new decorative surface layer (3) on top of the precast hollow floor slab (2). Step 5: Use the hanger (5) to connect the T-shaped steel bar (1) to the light steel keel system.

2. The construction method for reinforcing light steel keel after strengthening precast hollow floor slabs according to claim 1, characterized in that, In step 1, when performing carbon fiber reinforcement, each precast hollow floor slab (2) is treated as an independent unit, and two layers of carbon fiber cloth are pasted on its surface.

3. The construction method for reinforcing light steel keel reinforcement after precast hollow floor slab reinforcement according to claim 1, characterized in that, The diameter of the holes drilled in step 2 is matched with the T-shaped steel bar (1), the spacing between the holes is controlled within 1.2m, and the holes are ensured to penetrate the precast hollow floor slab (2).

4. The construction method for reinforcing light steel keel after strengthening precast hollow floor slabs according to claim 1, characterized in that, In step 4, a new decorative surface layer (3) is reconstructed on top of the precast hollow floor slab (2) using fine stone concrete or cement mortar to completely cover the T-shaped steel bars (1).

5. The construction method for reinforcing light steel keel after strengthening precast hollow floor slabs according to claim 1, characterized in that, Step 5 specifically involves: welding the upper end of the suspension rod (5) to the lower end of the T-shaped steel bar (1), applying anti-rust coating to the welded area and surrounding area, and connecting the lower end of the suspension rod (5) to the main keel (4) of the light steel keel system to form a complete hanging force transmission system, providing a stable foundation for the subsequent installation of paper-faced gypsum board.

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