A reinforced connection structure between a precast floor and a concrete beam

Abstract

The application discloses a reinforcing connection structure between a prefabricated floor and a concrete beam, and belongs to the field of building structure reinforcement. In view of the problems of poor integrity and weak anti-seismic performance of the connection between the prefabricated floor and the beam in an existing masonry structure, a bidirectional reinforcing mode is adopted, in which a top steel plate covers a beam joint area, and a bottom angle steel covering plate covers the bottom and the side of the beam. Through the synergistic effect of a bonding agent and staggered arranged anchor bolts, a composite reinforced interface is formed, and the shear performance and in-plane stiffness of the connection joint are significantly improved. Meanwhile, the deformation resistance of the angle steel is strengthened by the setting of the spaced distribution of stiffening ribs. The structure guarantees the reliability of the connection between the prefabricated floor and the concrete beam under the premise that the original structure is not removed, restrains the joint damage under the action of the earthquake, has the characteristics of convenient construction and wide adaptability, and is suitable for the seismic reinforcement and reconstruction of stock masonry buildings.

Description

Technical Field

[0001] This utility model belongs to the field of building structure reinforcement, specifically involving the connection structure between precast floor slabs and concrete beams in the reinforcement and renovation of masonry structures, and is particularly suitable for improving the seismic performance of existing masonry structure houses. Background Technology

[0002] Masonry structures, due to their simple construction and convenient installation, were widely used in low-rise and multi-story residential buildings, office buildings, hospitals, and schools in my country during the relatively economically underdeveloped period of the 20th century. Statistics show that the total area of ​​existing masonry structure buildings exceeds 10 billion square meters. To shorten construction time, precast floor slabs are commonly used as roof components in these structures. Precast floor slabs are prefabricated in factories or on-site and then installed, offering advantages in both construction efficiency and economy. Traditional connection methods require the slab end to extend into the concrete beam by at least 100mm, and then be anchored into the beam with pre-embedded reinforcing bars before integral casting. However, this method is significantly less robust than cast-in-place beam-slab systems, making them prone to failure under earthquake loads due to weak connections. Past earthquake damage has shown that failure at the connection between precast slabs and concrete beams is one of the main modes of damage to masonry structures.

[0003] With economic development and improved living standards, the requirements for building safety, especially seismic performance, are becoming increasingly stringent, and many existing masonry structures can no longer meet current standards. For such buildings, demolition or reinforcement are the only two options. Considering the large number of existing masonry structures in my country, complete demolition is both impractical and wasteful of resources; therefore, structural reinforcement has become the mainstream solution. Thus, there is an urgent need to develop a reinforcement structure for the connection between precast floor slabs and concrete beams to enhance their collaborative performance, improve in-plane stiffness, and ensure effective transmission of horizontal forces. Summary of the Invention

[0004] This application aims to address the problems of poor integrity and weak seismic resistance at the connection nodes between precast floor slabs and concrete beams in masonry structures. It provides a reinforced connection structure that significantly enhances interfacial bonding and shear resistance through a composite anchoring system of top steel plate and bottom angle steel, thereby improving the structural co-load capacity and horizontal load transfer efficiency, and ultimately enhancing the overall safety of the building.

[0005] To solve the above-mentioned technical problems, the technical solution proposed in this application is as follows:

[0006] This invention provides a reinforced connection structure between a precast floor slab and a concrete beam, comprising: a top reinforcement component, a bottom reinforcement component, and an anchoring system;

[0007] The top reinforcement assembly includes steel plates laid on the top of the precast floor slabs and the top surface of the concrete beams;

[0008] The bottom reinforcement components include angle steel and stiffening ribs installed on the bottom of the precast floor slab and the sides of the concrete beam;

[0009] The anchoring system includes a first anchor bolt connecting the steel plate to the concrete beam and the precast floor slab, and a second anchor bolt connecting the angle steel to the side of the concrete beam;

[0010] The steel plate horizontally covers the joint area between the precast floor slab and the concrete beam, and the width B of the steel plate is equal to the width of the concrete beam plus 2 × (100mm~150mm).

[0011] The two flanges of the angle steel are respectively attached to the side of the concrete beam and the bottom edge of the precast floor slab;

[0012] The stiffening ribs are vertically welded to the two flanges of the angle steel;

[0013] The first anchor bolt penetrates the steel plate and is anchored into the concrete beam and precast floor slab, while the second anchor bolt penetrates the angle steel and is anchored into the side of the concrete beam.

[0014] Furthermore, the contact surfaces of the steel plate with the precast floor slab and concrete beam are treated by removing the plaster layer and grinding them smooth, and the surfaces of the three are coated with adhesive.

[0015] Furthermore, the first anchor bolts are spaced 400mm to 600mm apart and are evenly distributed on the concrete beam and the precast floor slabs on both sides.

[0016] Furthermore, the contact surfaces of the angle steel with the bottom of the precast floor slab and the side of the concrete beam are treated by removing the plaster layer and grinding it smooth, and the surfaces of the three are coated with adhesive.

[0017] Furthermore, the stiffening ribs are spaced 400mm to 600mm apart along the length of the angle steel.

[0018] Furthermore, the spacing of the second anchor bolt is 400mm to 600mm, and it is staggered with the stiffening rib.

[0019] Compared with the prior art, the present invention achieves the following beneficial technical effects:

[0020] This application utilizes a dual reinforcement mechanism of top steel plate and bottom angle steel, combined with the synergistic effect of bonding layer and anchor bolts, to significantly enhance the integrity and shear bearing capacity of the interface between precast slab and concrete beam, effectively suppressing connection failure under seismic action; the construction process does not require the demolition of the original structure, greatly reducing the difficulty and cost of modification, and is suitable for large-scale seismic reinforcement of existing buildings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of a reinforcement connection structure between a precast floor slab and a concrete beam, provided in an embodiment of the present invention.

[0023] Figure 2 This is a side view of a reinforced connection structure between a precast floor slab and a concrete beam, provided in an embodiment of the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1-2 As shown in the embodiments of this application, a reinforcement connection structure between a precast floor slab and a concrete beam includes: a top reinforcement component 1, a bottom reinforcement component 2, and an anchoring system.

[0026] The top reinforcement component 1 includes a steel plate 5 laid on the top of the precast floor slab 3 and the top surface of the concrete beam 4;

[0027] The bottom reinforcement component 2 includes angle steel 6 and stiffening ribs 7 installed on the bottom of the precast floor slab 3 and the sides of the concrete beam 4;

[0028] The anchoring system includes a first anchor bolt 8 connecting the steel plate 5 to the concrete beam 4 and the precast floor slab 3, and a second anchor bolt 9 connecting the angle steel 6 to the side of the concrete beam 4.

[0029] Wherein, the steel plate 5 horizontally covers the joint area between the precast floor slab 3 and the concrete beam 4, and the width B of the steel plate 5 is equal to the width of the concrete beam 4 plus 2 × (100mm~150mm).

[0030] The two flanges of the angle steel 6 are respectively attached to the side of the concrete beam 4 and the bottom edge of the precast floor slab 3;

[0031] The stiffening rib 7 is vertically welded to the two flanges of the angle steel 6;

[0032] The first anchor bolt 8 penetrates the steel plate 5 and is anchored into the concrete beam 4 and the precast floor slab 3, and the second anchor bolt 9 penetrates the angle steel 6 and is anchored into the side of the concrete beam 4.

[0033] In the embodiments of this application, the contact surfaces of the steel plate 5 with the precast floor slab 3 and the concrete beam 4 are treated by removing the plaster layer and grinding it smooth, and the surfaces of the three are coated with adhesive 10.

[0034] In the embodiments of this application, the spacing of the first anchor bolts 8 is 400mm to 600mm, and they are evenly distributed on the concrete beam 4 and the precast floor slabs 3 on both sides.

[0035] In the embodiments of this application, the contact surfaces of the angle steel 6 with the bottom of the precast floor slab 3 and the side of the concrete beam 4 are treated by removing the plaster layer and grinding them smooth, and the surfaces of the three are coated with adhesive 10.

[0036] In the embodiments of this application, the stiffening ribs 7 are arranged at intervals of 400mm to 600mm along the length of the angle steel 6.

[0037] In the embodiments of this application, the spacing of the second anchor bolts 9 is 400mm to 600mm, and they are staggered with the stiffening ribs 7.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reinforced connection structure between a precast floor slab and a concrete beam, characterized in that, include: Top reinforcement component (1), bottom reinforcement component (2), anchoring system; The top reinforcement component (1) includes a steel plate (5) laid on the top of the precast floor slab (3) and the top of the concrete beam (4); The bottom reinforcement component (2) includes angle steel (6) and stiffening ribs (7) installed on the bottom of the precast floor slab (3) and the sides of the concrete beam (4); The anchoring system includes a first anchor bolt (8) connecting the steel plate (5) to the concrete beam (4) and the precast floor slab (3), and a second anchor bolt (9) connecting the angle steel (6) to the side of the concrete beam (4); Wherein, the steel plate (5) horizontally covers the joint area between the precast floor slab (3) and the concrete beam (4), and the width B of the steel plate (5) is equal to the width of the concrete beam (4) + 2 × (100mm ~ 150mm). The two flanges of the angle steel (6) are respectively attached to the side of the concrete beam (4) and the bottom edge of the precast floor slab (3); The stiffening rib (7) is vertically welded to the two flanges of the angle steel (6); The first anchor bolt (8) penetrates the steel plate (5) and is anchored into the concrete beam (4) and the precast floor slab (3), and the second anchor bolt (9) penetrates the angle steel (6) and is anchored into the side of the concrete beam (4).

2. The reinforced connection structure according to claim 1, characterized in that: The contact surfaces of the steel plate (5) with the precast floor slab (3) and the concrete beam (4) are treated by removing the plaster layer and grinding it smooth, and the surfaces of the three are coated with adhesive (10).

3. The reinforced connection structure according to claim 1, characterized in that: The first anchor bolts (8) are spaced 400mm to 600mm apart and are evenly distributed on the concrete beam (4) and the precast floor slabs (3) on both sides.

4. The reinforced connection structure according to claim 1, characterized in that: The contact surfaces of the angle steel (6) with the bottom of the precast floor slab (3) and the side of the concrete beam (4) are treated by removing the plaster layer and grinding it smooth, and the three surfaces are coated with adhesive (10).

5. The reinforced connection structure according to claim 1, characterized in that: The stiffening ribs (7) are arranged at intervals of 400mm to 600mm along the length of the angle steel (6).

6. The reinforced connection structure according to claim 1, characterized in that: The second anchor bolt (9) is spaced 400mm to 600mm apart and is staggered with the stiffening rib (7).

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