A precast concrete channel slab composite steel joist reinforcing assembly and method

Abstract

This invention provides a precast concrete trough slab combined with a steel support beam reinforcement component and method. The reinforcement component includes a combined steel support beam, which consists of a T-shaped steel beam and two steel plates. The web of the T-shaped steel beam passes through the joint between the two precast concrete trough slabs from bottom to top. Steel plates are fixed to both sides of the web of the T-shaped steel beam. Two connecting supports are provided, which are respectively connected to both ends of the combined steel support beam. The bottom of the connecting supports is installed at the top of the load-bearing wall. This reinforcement component significantly improves the load-bearing capacity of the precast concrete trough slab without increasing the weight of the floor slab, without changing the stress mode of the precast concrete trough slab or the stress mode of the transverse walls in the structure. It increases the support length of the precast concrete trough slab, meeting current specifications, and adds tie steel bands to improve overall integrity, avoiding the risk of floor slab detachment and collapse during earthquakes.

Description

Technical Field

[0001] This invention belongs to the field of precast concrete trough slab reinforcement technology, specifically relating to a precast concrete trough slab combined with steel support beam reinforcement component and reinforcement method. Background Technology

[0002] Precast concrete trough slabs were widely adopted in urban and rural areas from the 1960s to the 1990s. Due to economic and technological limitations at the time, precast concrete trough slabs, with their advantages of factory prefabrication, on-site hoisting, fast construction, low cost, and high degree of industrialization, were extensively used for floor and roof slabs in residential buildings, dormitories, office buildings, schools, and factories. The structural characteristics of precast concrete trough slabs are: mostly simply supported slabs, horizontally supported, and joined with joints, resulting in poor overall integrity and seismic resistance. The core reasons for the need for reinforcement are as follows: Low concrete strength, insufficient reinforcement, poor joint treatment, and slabs connected only by grouting without reliable ties make them prone to collapse and fall during earthquakes.

[0003] With functional upgrades and updated standards, existing old buildings being converted into commercial, office, and warehouse spaces have seen a significant increase in live loads. The addition of equipment, ceilings, partitions, and underfloor heating has also increased dead loads. The original design no longer meets current load specifications.

[0004] Current seismic design codes impose stricter requirements on the integrity, ties, and support length of precast slabs. Renovation of old residential areas and assessments of dilapidated buildings (C / D level) mandate reinforcement or demolition. However, many existing precast slab buildings do not meet current safety standards and require reinforcement.

[0005] Existing reinforcement methods have the following shortcomings: Increasing the cross-section (composite layer): Significantly increases weight, slows construction, and affects net height. The composite layer should be at least 50mm thicker, resulting in a 50mm loss of net height and an increase of 100kg / ㎡ in slab weight.

[0006] Adhesive steel plates: prone to corrosion, complex construction, poor durability, and the existing precast concrete trough slabs have low concrete strength and are not firmly bonded.

[0007] Carbon fiber reinforced polymer (CFRP) is lightweight and high-strength, but its stiffness improvement is limited. Existing precast concrete trough slabs have low concrete strength and are easy to peel off, resulting in weak improvement in overall integrity.

[0008] Based on this, a precast concrete trough-shaped plate combined with steel support beam reinforcement component and reinforcement method are proposed. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a precast concrete trough plate combined with steel support beam reinforcement component and reinforcement method to address the shortcomings of the prior art mentioned above.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: In a first aspect, a precast concrete trough-shaped slab combined with a steel support beam reinforcement assembly includes: A composite steel support beam, which consists of a T-shaped steel beam and two steel plates. The web of the T-shaped steel beam passes through the joint between two precast concrete trough slabs from bottom to top. Steel plates are fixed to both sides of the web of the T-shaped steel beam. The connecting supports are provided in two parts, which are respectively connected to both ends of the combined steel support beam, and the bottom of the connecting supports is installed at the top of the load-bearing wall.

[0011] As a further explanation of the present invention, the flange of the T-shaped steel is attached to the rib of the precast concrete trough plate, and the net height of the web of the T-shaped steel is 20mm greater than the height of the precast concrete trough plate.

[0012] As a further explanation of the present invention, the steel plate and the web of the T-shaped steel are fixed by bevel welding.

[0013] As a further explanation of the present invention, the combined steel support beam is attached to the bottom of the precast concrete trough plate, and M15 mortar is applied to the contact surface.

[0014] As a further explanation of the present invention, the connecting support is composed of an inner angle steel, an outer angle steel, a tie rod and a matching nut; At least two tie rods are provided, and each tie rod passes through the top of the load-bearing wall. An inner angle steel is installed on the inner end of the tie rod, and an outer angle steel is installed on the outer end of the tie rod. The inner and outer angle steels are fixed to the tie rods by matching nuts. The ends of the combined steel support beam are fixed to the inner angle steel.

[0015] As a further explanation of the present invention, structural adhesive is injected into the perforation of the tie rod in the load-bearing wall, and structural adhesive is applied to the mating surface of the outer angle steel and the composite steel support beam.

[0016] As a further explanation of the present invention, triangular stiffening plates are fixed on the inner angle steel and the outer angle steel respectively.

[0017] As a further explanation of the present invention, it also includes: Tie steel strip; The tie steel strip is fixed between the bottom ends of two adjacent T-shaped steels.

[0018] As a further explanation of the present invention, at least two parallel tie steel strips are fixed between the bottom ends of two adjacent T-shaped steels, and the spacing between the adjacent tie steel strips is set at 1500mm.

[0019] Secondly, a reinforcement method for a precast concrete trough-shaped slab combined with a steel support beam reinforcement assembly includes the following steps: S1. Clean the precast concrete trough slab; Clean the upper decorative surface layer and lower ceiling of the precast concrete trough slab, and clean the mortar joints between adjacent precast concrete trough slabs. S2. Install the combined steel support beam; The web of the T-shaped steel passes through the joint between adjacent precast concrete trough slabs from bottom to top. The flange of the T-shaped steel is attached to the rib of the precast concrete trough slab. Steel plates are welded to the web of the T-shaped steel above the joint using bevel welding. S3. Install the connecting support; First, multiple tie rods are inserted parallel to each other through the top of the load-bearing wall. Inner angle steel is installed on the inner end of the tie rod, and outer angle steel is installed on the outer end of the tie rod. The inner and outer angle steels are fixed to the two ends of the tie rod with matching nuts. The end of the combined steel support beam is fixed to the inner angle steel. S4, welded tie steel strip; Weld a tie steel strip between the bottom ends of two adjacent T-shaped steels, and control the spacing between the adjacent tie steel strips to be 1500mm to complete the reinforcement work of the precast concrete trough slab.

[0020] Compared with the prior art, the present invention has the following advantages: The reinforcement component in this invention consists of a combined steel support beam and connecting supports. Without increasing the weight of the floor slab, it significantly improves the load-bearing capacity of the precast concrete trough slab, without changing the stress mode of the precast concrete trough slab or the stress mode of the transverse walls in the structure. It increases the support length of the precast concrete trough slab to meet the requirements of current specifications, adds tie steel strips to improve the overall integrity, avoids the risk of floor slab detachment and collapse under earthquakes, and overcomes the problems of increased weight, reduced net height, slow construction, and wet work in traditional reinforcement methods. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the usage state of the present invention; Figure 3 This is a front view of the combined steel support beam of the present invention in use; Figure 4 This is a schematic diagram of the explosion state of the connecting support of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1-T-shaped steel; 2-steel plate; 3-connecting support; 31-inner angle steel; 32-outer angle steel; 33-tie rod; 34-stiffening plate; 35-matching nut; 4-tie steel strip; 5-precast concrete trough plate; 6-load-bearing wall. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] like Figure 1-4 As shown, the present invention provides a technical solution: a precast concrete trough-shaped slab combined with steel support beam reinforcement component, comprising: a combined steel support beam and a connecting support 3; In this embodiment, the combined steel support beam consists of a T-shaped steel 1 and two steel plates 2. The web of the T-shaped steel 1 passes through the joint between two precast concrete trough plates 5 from bottom to top. Steel plates 2 are fixed on both sides of the web of the T-shaped steel 1. The steel plates 2 and the web of the T-shaped steel 1 are fixed by bevel welding. The flange of the T-shaped steel 1 is attached to the rib of the precast concrete trough plate 5, and the net height of the web of the T-shaped steel 1 is 20mm greater than the height of the precast concrete trough plate 5. The combined steel support beam is attached to the bottom of the precast concrete trough plate 5, and M15 mortar is applied to the contact surface.

[0025] In this embodiment, two connecting supports 3 are provided, and the two connecting supports 3 are respectively connected to both ends of the combined steel beam. The bottom of the connecting support 3 is installed at the top of the load-bearing wall 6.

[0026] The connecting support 3 is composed of an inner angle steel 31, an outer angle steel 32, a tie rod 33, and a matching nut 35. At least two tie rods 33 are provided, and the tie rods 33 pass through the top of the load-bearing wall 6. Structural adhesive is injected into the through hole of the tie rod 33 in the load-bearing wall 6. The contact surface between the outer angle steel 32 and the combined steel support beam is coated with structural adhesive.

[0027] An inner angle steel 31 is installed on the inner end of the tie rod 33, and an outer angle steel 32 is installed on the outer end of the tie rod 33. The inner angle steel 31 and the outer angle steel 32 are respectively fixed to the tie rod 33 by matching nuts 35. The ends of the combined steel support beam are fixed to the inner angle steel 31.

[0028] To improve the stability of the connection, triangular stiffening plates 34 are fixed on the inner angle steel 31 and the outer angle steel 32 respectively.

[0029] In this embodiment, it also includes: a tie steel strip 4; The tie steel strip 4 is fixed between the bottom ends of two adjacent T-shaped steels 1. At least two parallel tie steel strips 4 are fixed between the bottom ends of two adjacent T-shaped steels 1, and the spacing between adjacent tie steel strips 4 is set at 1500mm.

[0030] The reinforcement method for the aforementioned precast concrete trough-shaped slab combined with steel support beam reinforcement assembly includes the following steps: S1. Clean the precast concrete trough slab 5; Clean the upper decorative surface layer and lower ceiling of the precast concrete trough slab 5, and clean the mortar joints between adjacent precast concrete trough slabs 5. S2. Install the combined steel support beam; The web of T-shaped steel 1 passes through the joint of the adjacent precast concrete trough plate 5 from bottom to top. The flange of T-shaped steel 1 is attached to the rib of the precast concrete trough plate 5. Steel plate 2 is welded to both sides of the web of T-shaped steel 1 above the joint using bevel welding. S3. Install connecting support 3; First, multiple tie rods 33 are inserted parallel to each other at the top of the load-bearing wall 6. Inner angle steel 31 is installed on the inner end of the tie rod 33, and outer angle steel 32 is installed on the outer end of the tie rod 33. The inner angle steel 31 and outer angle steel 32 are fixed to the two ends of the tie rod 33 by matching nuts 35. The end of the combined steel support beam is fixed to the inner angle steel 31. S4, welded tie steel strip 4; Weld a tie steel strip 4 between the bottom ends of two adjacent T-shaped steels 1, and control the spacing of the adjacent tie steel strips 4 to be 1500mm to complete the reinforcement work of the precast concrete trough slab 5.

[0031] Experimental example: Experimental subject: A dormitory building from the 1970s, with a load-bearing transverse wall spacing of 3.3m, a live load design value of 1.5kN / ㎡, and a surface decorative layer strength of 2.0kN / ㎡. The selected precast concrete channel slab (Type 5) has a thickness of 180mm, a side rib height of 180mm, a middle slab thickness of 50mm, a net slab width of 590mm, and a slab length of 3.3m. The rib reinforcement of the channel slab is designed to be C12, and the concrete strength is C30.

[0032] The precast concrete trough slab is reinforced using the combined steel support beam reinforcement assembly described in the above embodiment. The combined steel support beam used for reinforcement has a cross section of H190x180x4x4 and is made of Q235B steel. While keeping the decorative surface layer of the slab unchanged at 2.0kN / ㎡, the design value of the ultimate live load that the precast concrete trough slab 5 can withstand after reinforcement is 5.0kN / ㎡, which is 3.3 times the original design. At this time, the 50mm thick plate between the two ribs is used to constrain the bearing capacity of the precast concrete trough slab.

[0033] Using this reinforcement method, the average weight increase is 28.5 kg per square meter, compared to 125 kg per square meter for the traditional method of increasing the cross-section with a minimum 50 mm thick composite layer. The weight of the reinforcement components in this experimental example is far lower than that of the traditional method, making it economical and practical.

[0034] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0035] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0036] The directional terms "inner" and "outer" refer to the inner and outer sides relative to the outline of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," or "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0037] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precast concrete trough-shaped slab combined with a steel support beam reinforcement assembly, characterized in that, include: The combined steel support beam consists of a T-shaped steel (1) and two steel plates (2). The web of the T-shaped steel (1) passes through the joint between two precast concrete trough plates (5) from bottom to top. The web of the T-shaped steel (1) is fixed with steel plates (2) on both sides. There are two connecting supports (3), which are respectively connected to both ends of the combined steel beam. The bottom of the connecting support (3) is installed at the top of the load-bearing wall (6).

2. The precast concrete trough-shaped slab combined with steel support beam reinforcement assembly according to claim 1, characterized in that, The flange of the T-shaped steel (1) is attached to the rib of the precast concrete trough plate (5), and the net height of the web of the T-shaped steel (1) is 20mm greater than the height of the precast concrete trough plate (5).

3. The precast concrete trough-shaped slab combined with steel support beam reinforcement component according to claim 2, characterized in that, The steel plate (2) and the web of the T-shaped steel (1) are fixed by bevel welding.

4. The precast concrete trough-shaped slab combined with steel support beam reinforcement assembly according to claim 3, characterized in that, The combined steel support beam is attached to the bottom of the precast concrete trough plate (5), and M15 mortar is applied to the contact surface.

5. The precast concrete trough-shaped slab combined with steel support beam reinforcement component according to claim 4, characterized in that, The connecting support (3) is composed of an inner angle steel (31), an outer angle steel (32), a tie rod (33), and a matching nut (35). At least two tie rods (33) are provided, and the tie rods (33) are respectively inserted through the top of the load-bearing wall (6). An inner angle steel (31) is installed on the inner end of the tie rod (33), and an outer angle steel (32) is installed on the outer end of the tie rod (33). The inner angle steel (31) and the outer angle steel (32) are respectively fixed to the tie rod (33) by matching nuts (35). The ends of the combined steel support beam are fixed to the inner angle steel (31).

6. The precast concrete trough-shaped slab combined with steel support beam reinforcement component according to claim 5, characterized in that, The tie rod (33) is filled with structural adhesive in the perforation of the load-bearing wall (6), and the outer angle steel (32) and the composite steel support beam are coated with structural adhesive on their mating surfaces.

7. The precast concrete trough-shaped slab combined with steel support beam reinforcement component according to claim 6, characterized in that, Triangular stiffening plates (34) are fixed on the inner angle steel (31) and the outer angle steel (32), respectively.

8. The precast concrete trough-shaped slab combined with steel support beam reinforcement assembly according to claim 1, characterized in that, Also includes: Tie steel strip (4); The tie steel strip (4) is fixed between the bottom ends of two adjacent T-shaped steels (1).

9. The precast concrete trough-shaped slab combined with steel support beam reinforcement component according to claim 8, characterized in that, At least two parallel tie steel strips (4) are fixed between the bottom ends of two adjacent T-shaped steels (1), and the spacing between the adjacent tie steel strips (4) is set at 1500mm.

10. A reinforcement method for a precast concrete trough-shaped slab combined with a steel support beam reinforcement assembly according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Clean the precast concrete trough slab (5); Clean the upper decorative surface and lower ceiling of the precast concrete trough slab (5), and clean the mortar joints between adjacent precast concrete trough slabs (5). S2. Install the combined steel support beam; The web of the T-shaped steel (1) passes through the joint of the adjacent precast concrete trough plate (5) from bottom to top. The flange of the T-shaped steel (1) is attached to the rib of the precast concrete trough plate (5). Steel plates (2) are welded on both sides of the web of the T-shaped steel (1) above the joint using bevel welding. S3. Install the connecting support (3); First, multiple tie rods (33) are inserted parallel to each other at the top of the load-bearing wall (6). Inner angle steel (31) is installed on the inner end of the tie rod (33), and outer angle steel (32) is installed on the outer end of the tie rod (33). The inner angle steel (31) and outer angle steel (32) are fixed at both ends of the tie rod (33) by matching nuts (35). The end of the combined steel support beam is fixed on the inner angle steel (31). S4, Welded tie steel strip (4); Weld a tie steel strip (4) between the bottom ends of two adjacent T-shaped steels (1), and control the spacing of the adjacent tie steel strips (4) to be 1500mm to complete the reinforcement of the precast concrete trough plate (5).

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