Reinforcing method for gradient stress of floor slab in continuous high-low slab descending area

Abstract

The invention provides a reinforcing method for gradient stress of a floor slab in a continuous high-low slab descending area, and relates to the technical field of floor slab reinforcing, the reinforcing method comprises the following steps: S1, backfilling an internal corner part of a high-low span floor slab in transition from a low span to a high span by adopting cement mortar to form a first transition inclined surface; s2, a V-shaped steel plate structure is fixedly arranged at the corresponding position below the high-span floor slab, and a second transition slope is formed; and S3, carbon fiber cloth is continuously laid along the first transition inclined face and the second transition inclined face and bonded with the base face through resin adhesive, and the high-low-span floor slab is integrally reinforced. The method has the beneficial effects that through the combination mode of cement mortar backfilling and steel plate anchor bolt fixing, transition nodes similar to a bridge frame are constructed at the high-low span internal corners, the single mode that a traditional reinforcing scheme only depends on carbon fiber cloth is broken through, a scientific stress transmission path is formed, and the problem of facade stress defects is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of floor reinforcement, in particular to a continuous high-low dropped slab area floor gradient stress reinforcement method. BACKGROUND

[0002] In the process of urban renewal and reconstruction, a large number of main structure slabs of existing buildings need to be reinforced due to the demand for functional upgrading, load increase, etc. The core operation process of carbon fiber cloth reinforcement floor technology as a widely used reinforcement method is as follows: carbon fiber cloth is laid on the bottom of the original main structure floor and the top of the beam body position according to the design specified interval for reinforcement; at the same time, resin glue is used to tightly bond the carbon fiber cloth and the floor surface to ensure their firm combination, thereby improving the performance of the building structure.

[0003] At the current stage, the traditional carbon fiber cloth reinforcement floor scheme is mostly suitable for common flat floor scenarios and can better play a reinforcing role in this scenario. However, in actual building structures, due to design differences, there are often floor reinforcement needs in high-low span dropped slab areas. When reinforcing the dropped slab area with a height difference, the limitations of the traditional scheme become apparent - stress defects occur at the high-low span vertical surface position, which directly leads to a significant reduction in reinforcement effect.

[0004] For reinforcement work in such high-low span dropped slab areas, the traditional scheme cannot meet the requirements of structural bearing capacity and is prone to stress discontinuity at the high-low span vertical surface position, thereby causing safety hazards. More importantly, there is no standard atlas or mature node method for this special scenario in the industry, which greatly disturbs actual reinforcement construction.

[0005] How to solve the above technical problems is the subject faced by the present application. SUMMARY

[0006] In order to solve the problems of the prior art, the present application provides a continuous high-low dropped slab area floor gradient stress reinforcement method, which solves the problem of stress defects at the high-low span vertical surface position when reinforcing the continuous high-low span floor, and through innovative node design, a scientific and reasonable stress transmission path is constructed to effectively connect the reinforcement stress at the high-low span vertical surface position and fundamentally avoid the occurrence of stress defects.

[0007] The application provides a set of standardized construction process and node method, clearly defines each key link and operation specification in the construction process, ensures the controllability of the construction process, reduces the operation difficulty of the construction personnel, thereby significantly improves the construction efficiency, guarantees the engineering progress, guarantees the overall stability and bearing capacity of the structure after reinforcement, strictly meets the requirements of relevant specifications for high-low span continuous floor slab reinforcement, effectively solves the stress defect problem of the facade during high-low span continuous floor slab reinforcement, provides a technical scheme that can be used for reference and popularization for similar floor slab reinforcement engineering, and promotes the improvement of the industry technical level.

[0008] The technical scheme adopted by the application to solve the technical problems is: the application provides a reinforcement method for gradient stress of continuous high-low drop slab area floor, when carbon fiber cloth is used to reinforce the floor and meets the high-low span position, the following steps are carried out for construction:

[0009] S1, cement mortar fills the low span misalignment: at the reentrant corner part of the transition from the low span floor to the high span floor, cement mortar is used for backfilling treatment to form a first transition inclined surface, the included angle between the inclined surface formed by the cement mortar backfilling and the floor slab is θ, and the included angle θ satisfies: tan(θ)≤1 / 6;

[0010] Specifically, first, the upper and lower misalignment areas at the low span position are measured and laid out, and the upper and lower misalignment size Δh at the low span position is measured.

[0011] The filling range of the cement mortar is determined by the upper and lower misalignment size Δh, wherein the width of the mortar filling needs to be greater than or equal to 6 times the upper and lower misalignment size, and the filling width is ≥6Δh, which satisfies L≥6Δh, so as to ensure that the included angle θ formed by the inclined surface after filling and the floor slab satisfies the requirement of tan(θ)≤1 / 6, after the laying out is completed, the cement mortar filling construction is carried out according to the determined range.

[0012] S2, V-shaped steel plate welding under high span: a V-shaped steel plate structure is fixedly arranged at the corresponding position under the high span floor to form a second transition inclined surface, the V-shaped steel plate structure is formed by welding and is fixed to the concrete base body by anchor bolts;

[0013] Specifically, while the cement mortar filling operation is carried out, the construction area under the high span is measured and laid out to clearly define the welding position and angle of the steel plate, so as to ensure that the included angle θ formed by the inclined surface of the V-shaped steel plate and the floor slab after welding also satisfies tan(θ)≤1 / 6.

[0014] Subsequently, a carbon dioxide gas shielded welding equipment is used to weld a 4mm thick steel plate into a V-shaped structure and fix it at the preset position.

[0015] S3, carbon fiber cloth laying: the carbon fiber cloth is continuously laid along the first transition slope and the second transition slope, and is bonded with the base surface through resin glue, so that the high-span floor and the low-span floor are integrally reinforced;

[0016] Specifically, after the cement mortar at the low-span position reaches the design strength, that is, the curing reaches more than 75% of the design strength, and the weld of the steel plate under the high-span is detected to be qualified, the carbon fiber cloth laying operation is performed, the carbon fiber cloth is continuously laid along the slope formed by the cement mortar filling and the slope formed by the steel plate welding, and the carbon fiber cloth is tightly bonded with the contact surface by using resin glue during the laying process, so that the high-low span area floor is integrally reinforced.

[0017] The beneficial effects of the present application are that: the present application constructs a transition node similar to a bridge by the combination of cement mortar backfilling and steel plate anchoring, breaks the traditional reinforcement scheme which only relies on the single mode of carbon fiber cloth, forms a scientific stress transmission path, and effectively solves the facade stress defect problem;

[0018] The present application obtains the core control index tan(θ)≤1 / 6 based on the relevant construction calculation of 22G101-1 atlas, clearly defines the angle requirement of the cement mortar filling slope and the steel plate welding slope, provides a quantitative standard for construction operation, and ensures that the stress defect can be ignored. The present application decomposes the reinforcement process into three key steps of mortar filling, steel plate welding and carbon cloth laying, clearly defines the preconditions of each step such as mortar strength and weld detection, forms a logically coherent and replicable construction system, and guarantees the stability of construction quality;

[0019] The present application aims at the technical blank that the existing traditional carbon fiber cloth reinforcement scheme is only applicable to flat floors and cannot cope with the stress defect problem of high-low span drop plate area, realizes the effective connection of high-low span facade stress through innovative node construction and angle control, completely eliminates the stress defect, and the stability and bearing capacity of the reinforced structure are significantly better than those of the traditional scheme, effectively avoiding safety hazards; at the same time, there is no standard atlas and mature node method for high-low span drop plate area reinforcement in the industry at present, and construction units often rely on experience for construction, so the quality is difficult to control; the present application clearly defines the key contents such as material specifications, construction process and angle control standard, forms a standardized technical scheme, construction personnel can construct according to the drawing and operate according to the steps, greatly reduces the construction difficulty, facilitates quality inspection and acceptance, improves the stability of engineering quality, and the cement mortar, 4mm steel plate and M8 anchor bolt used in the present application are common materials in building engineering, which are easy to purchase and have low cost, and have significant economic advantage compared with other special reinforcement materials; at the same time, the steel plate can be flexibly cut according to different high-low span sizes, the cement mortar filling range can be adjusted through calculation, and the present application is suitable for reinforcement of high-low span drop plate areas with different height differences, has strong practicality and wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 The figure is a reinforcing schematic diagram for the intersection of high-low span floor of the application.

[0021] Fig. 2 The figure is a reinforcing paving schematic diagram for the intersection of high-low span floor of the application.

[0022] Wherein, the reference numerals are: 1, first transition slope; 2, second transition slope; 3, high span floor; 4, low span floor; 5, cement mortar; 6, carbon fiber cloth; 7, V-shaped steel plate structure; 8, anchor bolt. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of the scheme, the following through specific embodiments, the scheme is described.

[0024] Example 1

[0025] Referring to Figs. 1-2 The embodiment is a reinforcing method for continuous high-low drop floor area floor gradient stress, when carbon fiber cloth is used to reinforce the floor, the following steps are carried out when the high-low span position is encountered:

[0026] S1, cement mortar fills the low span misalignment: at the inside corner part of the high span floor 3 and the low span floor 4 from the low span to the high span transition, cement mortar 5 is used for backfilling treatment to form a first transition slope 1, the slope formed by the backfilling of the cement mortar 5 and the included angle of the low span floor 4 floor slab is θ, the included angle θ satisfies: tan(θ)≤1 / 6;

[0027] Specifically: first, the upper and lower misalignment area of the low span position is measured and laid out, the upper and lower misalignment size Δh of the low span position is measured;

[0028] The filling range of the cement mortar 5 is determined by the upper and lower misalignment size Δh, wherein the width of the cement mortar 5 filling needs to be greater than or equal to 6 times the upper and lower misalignment size, and the filling width ≥6Δh, which satisfies L≥6Δh, to ensure that the included angle θ formed by the first transition slope 1 after filling and the low span floor 4 floor slab satisfies the requirement of tan(θ)≤1 / 6, after the laying out is completed, the cement mortar 5 filling construction is carried out according to the determined range, and the mortar is ensured to be dense and the surface is smooth during the filling process.

[0029] S2, V-shaped steel plate welding under high span: at the corresponding position under the high span floor 3, a V-shaped steel plate structure 7 is fixedly arranged to form a second transition slope 2, the V-shaped steel plate structure 7 is formed by welding, and is fixed to the concrete base body by an anchor bolt 8;

[0030] Specifically, while filling the cement mortar 5, the construction area under the high-span floor slab 3 is measured and laid out to clarify the welding position and angle of the V-shaped steel plate structure 7, and to ensure that the angle θ formed by the inclined surface of the V-shaped steel plate structure 7 and the floor panel of the high-span floor slab 3 after welding also satisfies tan(θ)≤1 / 6.

[0031] Subsequently, carbon dioxide gas shielded welding equipment was used to weld the 4mm thick steel plate into a V-shaped structure and fix it in the preset position. During the welding process, the height, width and welding speed of the weld were strictly controlled, and the weld quality met the specifications.

[0032] S3. Carbon fiber cloth laying: Carbon fiber cloth 6 is continuously laid along the first transition slope 1 and the second transition slope 2, and bonded to the base surface with resin adhesive to achieve overall reinforcement of the high and low span floor slabs.

[0033] Specifically, after the cement mortar 5 at the lower span position reaches the design strength, that is, cured to more than 75% of the design strength, and the weld of the V-shaped steel plate structure 7 under the higher span floor slab 3 passes the inspection, the carbon fiber cloth 6 is laid. The carbon fiber cloth 6 is continuously laid along the slope formed by filling the cement mortar 5 and the slope formed by welding the V-shaped steel plate structure 7. During the laying process, resin adhesive is used to tightly bond the carbon fiber cloth 6 to the contact surface. The carbon fiber cloth 6 is wrinkle-free and has no hollow areas, thus achieving the overall reinforcement of the floor slab in the high and low span areas.

[0034] Calculations were performed based on the national standard for reinforced steel reinforcement in slab openings. When the triangular area formed at the inside corner satisfies the condition that the tangent tan(θ) ≤ 1 / 6 (where θ is the angle between the floor slab and the hypotenuse of the triangle) ≤ 1 / 6, the stress defects generated by the carbon fiber cloth under vertical force at the facade can be ignored, thus achieving effective reinforcement of the high-low span floor slab. The reinforcement structure at the junction of the high-low span floor slab is as follows: Fig. 2 As shown.

[0035] Example 2

[0036] In step S1 of this embodiment, in the area of ​​the misaligned platform between the upper and lower sections of the low span, precast concrete blocks are prefabricated according to the design dimensions (satisfying the filling width ≥ 6Δh and tan(θ) ≤ 1 / 6), and the strength grade of the precast blocks is one grade higher than that of the floor slab concrete.

[0037] During construction, the surface of the staggered floor slab is first roughened and an interface agent is applied. Then, the precast blocks are installed in place and fixed to the original floor slab by rebar anchoring. The subsequent steel plate welding and carbon fiber cloth laying steps are the same as those in Example 1.

[0038] The technical features not described in the present application can be realized by or using the prior art, which will not be described here again, of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples, the changes, modifications, additions or replacements made by the ordinary skilled in the art within the essential scope of the present application should also belong to the protection scope of the present application.

Claims

1. A method for reinforcing floor slabs with gradient stress in areas of continuous high and low elevations, characterized in that, Includes the following steps, S1. At the inside corner where the high-span floor slab (3) and the low-span floor slab (4) transition from the low-span to the high-span, cement mortar (5) is used for backfilling to form the first transition slope (1). S2. At the corresponding position below the high-span floor slab, a V-shaped steel plate structure (7) is fixedly installed to form a second transition slope (2); S3. The carbon fiber cloth (6) is continuously laid along the first transition slope (1) and the second transition slope (2), and bonded to the base surface with resin adhesive to reinforce the high-span floor slab (3) and the low-span floor slab (4) as a whole.

2. The reinforcement method for floor slab gradient stress in a continuous high-low slab area according to claim 1, characterized in that, In step S1, the angle between the first transition slope (1) formed by the backfilling of cement mortar (5) and the floor slab of the low-span floor slab (4) is θ, and the angle θ satisfies: tan(θ)≤1 / 6.

3. The reinforcement method for floor slab gradient stress in a continuous high-low slab area according to claim 1, characterized in that, Step S1 specifically includes: S11. Measure the vertical misalignment dimension Δh at the lower span position; S12. Determine the backfill range of cement mortar (5), and its width L satisfies: L≥6Δh; S13. Cement mortar (5) backfilling construction shall be carried out within the determined backfilling area.

4. The reinforcement method for floor slab gradient stress in a continuous high-low slab area according to claim 1, characterized in that, In step S2, the V-shaped steel plate structure (7) is formed by welding and fixed to the concrete substrate by anchor bolts (8).

5. The reinforcement method for floor slab gradient stress in a continuous high-low slab area according to claim 4, characterized in that, The V-shaped steel plate structure (7) has a thickness of 4mm and is welded using carbon dioxide gas shielded welding.

6. The reinforcement method for floor slab gradient stress in a continuous high-low slab area according to claim 1, characterized in that, In step S2, the angle between the inclined surface of the V-shaped steel plate structure (7) and the floor slab of the high-span floor slab (3) is θ, and the angle θ satisfies: tan(θ)≤1 / 6.

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