Welded connection joint structure of precast beam bracket type double T plate

Abstract

The utility model discloses a prefabricated beam bracket type double T board welding connection node structure, including reinforced concrete prefabricated double T board and reinforced concrete prefabricated beam, the lower part of reinforced concrete prefabricated beam is provided with the bracket, the utility model discloses, through bracket type double T board welding connection node structure, the node stiffness and overall stress performance are improved significantly, realize the beam board cooperation work, and the process such as formwork, complex binding reinforcement or bolt installation is saved simultaneously, and the construction process is greatly simplified, and the installation efficiency and quality controllability are improved, the double guarantee of bracket support and steel sheet welding, in combination with reliable anchoring of the exposed hoop reinforcement of reinforced concrete prefabricated beam top and upper secondary cast-in-place concrete layer, the bearing capacity of node and the security of long -term use are ensured together, the node structure is clear, and the principle is reliable, and the cross -section size and load condition of reinforced concrete prefabricated beam and reinforced concrete prefabricated double T board have good adaptability, and have remarkable popularization value.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building technology, and in particular to a precast beam corbel type double T plate welded connection node structure. Background Technology

[0002] With my country's economic development and the deepening of construction industrialization, building structure systems based on prefabricated concrete have emerged and are being promoted and applied as an important means of construction industrialization. Prefabricated concrete structure components are optimized according to design drawings, prefabricated in factories, and transported to the construction site in batches according to the construction schedule for hoisting, assembly, and installation. However, traditional connection methods have significant shortcomings:

[0003] Some existing technologies use a simple support method, with double T-slabs directly overlapping the top of the beam or ordinary supports, and the joints lack reliable rigid connection structures; this results in insufficient overall integrity of the floor slab, making it difficult to effectively transfer horizontal forces and bending moments, and there are obvious weak links in the stress; some welding or bolt connection schemes are prone to stress concentration due to the positioning deviation of embedded parts or unreasonable structure, which affects the durability of the joints.

[0004] Common cast-in-place joints or complex bolted connections require on-site formwork, rebar tying, or precision drilling. These procedures are cumbersome and rely on manual precision, resulting in low construction efficiency and large quality fluctuations. Inappropriate design of some embedded parts can also increase the difficulty of on-site adjustments and prolong the construction period.

[0005] Simply supported joints have weak seismic performance, while some rigid connection structures are sensitive to changes in component size and load, and have poor versatility; the beam-slab interface lacks effective connection, such as exposed stirrup design, which weakens the ability to work together with the post-cast layer and poses safety hazards.

[0006] Therefore, it is necessary to design a precast beam corbel type double T plate welded connection node structure. Utility Model Content

[0007] The purpose of this utility model is to provide a precast beam corbel-type double T-slab welded connection node structure to solve the problems of existing technologies that use a simply supported method, where the double T-slabs are directly overlapped on the beam top or ordinary supports, and the node lacks a reliable rigid connection structure. This results in insufficient overall floor slab integrity, difficulty in effectively transferring horizontal forces and bending moments, and obvious weak points in stress. Some welded or bolted connection schemes are prone to stress concentration due to positioning deviations of embedded parts or unreasonable construction, affecting the durability of the node. Common cast-in-place nodes or complex bolted connections require on-site formwork, rebar tying, or precision drilling, which are cumbersome procedures, rely on manual precision, have low construction efficiency, and large quality fluctuations. Some unreasonable embedded part designs can also increase the difficulty of on-site adjustments and prolong the construction period. In addition, simply supported nodes have weak seismic performance, while some rigid connection structures are sensitive to changes in component size and load, and have poor versatility. The beam-slab interface lacks effective connection, such as exposed stirrup design, which weakens the ability to work together with the post-cast layer and poses safety hazards.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a precast beam corbel type double T plate welded connection node structure, including a reinforced concrete precast double T plate and a reinforced concrete precast beam, wherein a corbel is provided at the bottom of the reinforced concrete precast beam, and the corbel provides a clear and reliable support point for the reinforced concrete precast double T plate;

[0009] The upper surface of the cow leg is fixedly provided with a first embedded iron part, which is a rectangular steel plate welded with anchor bars.

[0010] The top surface of the precast reinforced concrete beam is lower than the final design elevation of the beam top, and the difference is equal to the design thickness of the upper secondary cast-in-place concrete layer. The upper part of the stirrups of the precast reinforced concrete beam is exposed on its top surface. The reserved height difference and the exposed stirrups create the necessary conditions for the subsequent pouring of the upper secondary cast-in-place concrete layer and the realization of the overall coordinated stress of the beam and slab.

[0011] The lower part of both ends of the precast reinforced concrete double-T slab is fixedly provided with a second embedded iron part, which is a rectangular steel plate welded with anchor bars.

[0012] The position of the second embedded iron part corresponds to the position of the first embedded iron part;

[0013] During installation, the precast reinforced concrete double-T plate is placed on the corbel of the precast reinforced concrete beam. The second embedded iron part and the first embedded iron part are stacked on top of each other and fixedly connected by welding to form a rigid plate end connection node.

[0014] As a further technical solution of this utility model, the first embedded iron part and the second embedded iron part are provided with a number of anchor bars welded to their bottom and top surfaces. The anchor bars are anchored in the concrete of the corresponding precast reinforced concrete beam and precast reinforced concrete double T-slab, ensuring that the embedded steel plate can effectively transmit and disperse the force generated by the welding connection into the concrete body of the precast reinforced concrete beam and precast reinforced concrete double T-slab, preventing the steel plate from being pulled out or the concrete from being partially damaged.

[0015] As a further technical solution of this utility model, the first embedded iron part is set at the center position on the upper surface of the corbel, which helps to ensure that the load transmitted from the precast reinforced concrete double T slab can be transmitted more directly to the corbel and the main section of the precast reinforced concrete beam through each embedded iron part, avoiding eccentric force, improving the efficiency and reliability of force transmission at the node, and at the same time, the center position is also convenient for installation and positioning.

[0016] As a further technical solution of this utility model, the second embedded iron part is set at the center position of the lower surface of the end of the plate rib, which can make the load borne by the plate rib more evenly transferred to each embedded iron part, and then transferred to the bracket and each embedded iron part below by welding. The central symmetrical arrangement also facilitates the alignment and installation with the first embedded iron part on the bracket.

[0017] As a further technical solution of this utility model, the length of the exposed stirrups on the top surface of the precast reinforced concrete beam meets the anchorage requirements with the upper secondary cast-in-place concrete layer, so as to realize a reliable connection and joint work between the reinforced concrete beam and the upper secondary cast-in-place concrete layer, and ensure the transmission of horizontal shear force and the integrity of the structure.

[0018] As a further technical solution of this utility model, the cross-sectional dimensions of the precast reinforced concrete beam are 400mm×1300mm, and the height of 1300mm is the height of the precast part after deducting the thickness of the upper secondary cast-in-place concrete layer. The cross-sectional dimensions of the lower two sides of the corbel are 220mm in length and 300mm in height, providing sufficient support width and height for the precast reinforced concrete double T-slab.

[0019] The steel plate of the first embedded iron part has dimensions of -16mm×220mm×150mm and is welded with 4 ø12 anchor bars. -16mm indicates that the steel plate thickness is 16mm.

[0020] The cross-sectional dimensions of the precast reinforced concrete double-T slab are 2220mm wide × 850mm high × 14540mm long.

[0021] The steel plate of the second embedded iron part has dimensions of -16mm×200mm×100mm and is welded with 4 ø8 anchor bars. The diameter and number of anchor bars are determined based on stress calculations to ensure the anchoring strength of each embedded part in the concrete and the strength of the welding with the steel plate.

[0022] The advantages of the precast beam corbel type double T plate welded connection node structure provided by this utility model are as follows:

[0023] The node provides a clear and stable vertical support for the precast reinforced concrete double T-slab through the corbel, and forms a rigid connection through the welding of the first and second precast iron parts (11) set above and below, which effectively transfers the load and significantly improves the node stiffness and overall stress performance. The design of the precast reinforced concrete beam with reserved height and exposed stirrups ensures a reliable connection with the upper secondary cast-in-place concrete layer, and finally realizes the coordinated work of the beam and slab. At the same time, all key connecting parts are pre-embedded in the factory, and only hoisting and welding are required on site, which saves the process of formwork, complex reinforcement binding or bolt installation, greatly simplifies the construction process, and improves the installation efficiency and quality controllability.

[0024] The dual protection of corbel support and steel plate welding, combined with the reliable anchorage of the exposed stirrups on the top of the precast reinforced concrete beam and the upper secondary cast-in-place concrete layer, jointly ensures the load-bearing capacity and long-term safety of the joint. The joint has a clear structure and reliable principle, and has good adaptability to the cross-sectional dimensions and load conditions of precast reinforced concrete beams and precast reinforced concrete double-T slabs. It can be widely used in various prefabricated concrete building floor structures and has significant promotional value. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of the node structure of this utility model;

[0027] Figure 2 This is a cross-sectional view of the precast reinforced concrete beam of this utility model;

[0028] Figure 3 This is a short side view of the precast reinforced concrete double-T slab of this utility model;

[0029] Figure 4 This is a longitudinal side view of the precast reinforced concrete double-T slab of this utility model;

[0030] Figure 5 This is a detailed drawing of the first embedded iron component in this utility model;

[0031] Figure 6 This is a detailed drawing of the second embedded iron component in this utility model.

[0032] In the figure: 1. Precast reinforced concrete double-T slab; 11. Second embedded iron component; 12. Slab rib; 2. Precast reinforced concrete beam; 21. First embedded iron component; 22. Corbel; 3. Upper secondary cast-in-place concrete layer. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Please see the appendix Figure 1 - Appendix Figure 6 The present invention provides an embodiment of a precast beam corbel type double T plate welded connection node structure, including a reinforced concrete precast double T plate 1 and a reinforced concrete precast beam 2. A corbel 22 is provided at the lower part of the reinforced concrete precast beam 2, and the corbel 22 provides a clear and reliable support point for the reinforced concrete precast double T plate 1.

[0036] The upper surface of the corbel 22 is fixedly provided with a first embedded iron part 21. The first embedded iron part 21 is a rectangular steel plate welded with anchor bars. The first embedded iron part 21 is located at the center of the upper surface of the corbel 22, which helps to ensure that the load transmitted from the precast reinforced concrete double T slab 1 can be transmitted more directly to the main section of the corbel 22 and the precast reinforced concrete beam 2 through each embedded iron part, avoiding eccentric force, improving the efficiency and reliability of force transmission at the node, and at the same time, the center position is also convenient for installation and positioning.

[0037] The top surface of the precast reinforced concrete beam 2 is lower than the final design elevation of the beam top, and the difference is equal to the design thickness of the upper secondary cast-in-place concrete layer 3. The upper part of the stirrups of the precast reinforced concrete beam 2 is exposed on its top surface. The reserved height difference and the exposed stirrups create the necessary conditions for the subsequent pouring of the upper secondary cast-in-place concrete layer 3 and the realization of the overall coordinated stress of the beam and slab. The length of the exposed stirrups on the top surface of the precast reinforced concrete beam 2 meets the anchorage requirements with the upper secondary cast-in-place concrete layer 3, realizing a reliable connection and joint work between the precast reinforced concrete beam 2 and the upper secondary cast-in-place concrete layer 3, ensuring the transmission of horizontal shear force and the integrity of the structure.

[0038] The lower part of both ends of the rib 12 of the precast reinforced concrete double T slab 1 is fixed with a second embedded iron part 11. The second embedded iron part 11 is a rectangular steel plate with welded anchor bars. The second embedded iron part 11 is located at the center of the lower surface of the end of the rib 12, which can make the load borne by the rib 12 more evenly distributed to each embedded iron part, and then transferred to the bracket 22 below and each embedded iron part through welding. The central symmetrical arrangement also facilitates the alignment and installation with the first embedded iron part 21 on the bracket 22.

[0039] The position of the second embedded iron part 11 corresponds to the position of the first embedded iron part 21. The first embedded iron part 21 and the second embedded iron part 11 have several anchor bars welded to their bottom and top surfaces. The anchor bars are anchored in the concrete of the corresponding precast reinforced concrete beam 2 and precast reinforced concrete double T plate 1, ensuring that the embedded steel plate can effectively transmit and disperse the force generated by the welding connection to the concrete body of the precast reinforced concrete beam 2 and precast reinforced concrete double T plate 1, preventing the steel plate from being pulled out or the concrete from being partially damaged.

[0040] The precast reinforced concrete beam 2 has a cross-sectional dimension of 400mm × 1300mm. The 1300mm height is the height of the precast portion after deducting the thickness of the upper secondary cast-in-place concrete layer 3. The corbel 22 extends outwards on both sides at the bottom with a cross-sectional dimension of 220mm in length × 300mm in height, providing sufficient support width and height for the precast reinforced concrete double-T slab 1. The steel plate of the first embedded iron part 21 has a size of -16mm × 220mm × 150mm and is welded with 4 ø12 anchor bars. -16mm indicates that the steel plate thickness is 16mm. The precast reinforced concrete double-T slab 1 has a cross-sectional dimension of 2220mm in width × 850mm in height × 14540mm in length. The steel plate of the second embedded iron part 11 has a size of -16mm × 200mm × 100mm and is welded with 4 ø8 anchor bars. The diameter and number of anchor bars are determined based on stress calculations to ensure the anchorage strength of each embedded part in the concrete and the strength of the weld with the steel plate.

[0041] During installation, the precast reinforced concrete double-T plate 1 is placed on the corbel 22 of the precast reinforced concrete beam 2. The second embedded iron part 11 and the first embedded iron part 21 are stacked on top of each other and fixedly connected by welding to form a rigid plate end connection node.

[0042] It should be emphasized that these dimensional parameters are only an example of a specific engineering application. The core node structure of this utility model is applicable to precast reinforced concrete beams 2 and precast reinforced concrete double-T slabs 1 of different sizes, and the scope of protection is not limited to the dimensions shown in this embodiment.

[0043] Specifically, in use, firstly, based on the building load and span, determine the cross section of the precast reinforced concrete beam 2, the dimensions of the corbel 22, and the specifications of the precast reinforced concrete double-T plate 1; simultaneously design the positioning diagram of the embedded iron parts to ensure that the positions of the first embedded iron part 21 and the second embedded iron part 11 correspond precisely.

[0044] When the precast reinforced concrete beam 2 is poured, the first embedded iron part 21 is pre-embedded at the center of the upper surface of the corbel 22, and the anchor bar is embedded downward into the beam body; the top elevation of the beam is reduced to the design value minus the thickness of the upper secondary cast-in-place concrete layer 3, and the exposed length of the top stirrup meets the anchorage requirements; when the precast reinforced concrete double T plate 1 is produced, the second embedded iron part 11 is pre-embedded at the center of the lower surface of the end of the plate rib 12, and the anchor bar is embedded upward into the rib.

[0045] The axis and edge line of the precast reinforced concrete beam 2 are marked on the top surface of the support. The center point of the corbel 22 is marked. The lifting lugs on the top of the beam are connected by the lifting equipment and slowly lifted to the design position. Ensure that the center point of the corbel 22 coincides with the line point. Check the top elevation of the corbel 22, the position of the first embedded iron part 21 and the verticality of the exposed stirrups on the top of the beam.

[0046] Remove the laitance from the surface of the corbel 22, grind the welding area of ​​the first embedded iron part 21 until it has a metallic luster, hoist the precast reinforced concrete double T plate 1 and slowly place it on the corbel 22, fine-tune the position so that the second embedded iron part 11 and the first embedded iron part 21 are completely overlapped, use a jack to fine-tune the elevation, use steel wedges to tighten the gap between the plate rib 12 and the corbel 22, use welding rods to continuously and fully weld the two embedded iron parts around the perimeter, perform node welding, remove the welding slag after welding, and apply anti-rust paint.

[0047] Lay the top longitudinal reinforcement of the precast reinforced concrete beam 2 and tie it to the exposed stirrups; install the upper distribution reinforcement of the precast reinforced concrete double T slab 1, using fine stone concrete, and pour it in layers from the beam-column joint to the slab, and vibrate it to make it dense; cover it with a film to keep it moist and cure it. Remove the support after the upper secondary cast-in-place concrete layer 3 reaches 100% strength.

[0048] In summary, this utility model provides a clear and stable vertical support for the precast reinforced concrete double-T slab 1 through the corbel 22, and forms a rigid connection through the welding of the first embedded iron part 21 and the second embedded iron part (11) set at the top and bottom respectively, which effectively transfers the load and significantly improves the node stiffness and overall stress performance. The design of the precast reinforced concrete beam 2 with reserved height and exposed stirrups on the top surface ensures a reliable connection with the upper secondary cast-in-place concrete layer 3, and finally realizes the coordinated work of the beam and slab. At the same time, all key connecting parts are pre-embedded in the factory, and only hoisting and welding are required on site, which saves the process of formwork, complex reinforcement binding or bolt installation, greatly simplifies the construction process, and improves the installation efficiency and quality controllability.

[0049] The dual protection provided by the corbel 22 support and the welded steel plate, combined with the reliable anchorage of the exposed stirrups on the top of the precast reinforced concrete beam 2 and the upper secondary cast-in-place concrete layer 3, jointly ensures the load-bearing capacity and long-term safety of the joint. The joint has a clear structure and reliable principle, and has good adaptability to the cross-sectional dimensions and load conditions of the precast reinforced concrete beam and the precast reinforced concrete double-T slab 1. It can be widely used in various prefabricated concrete building floor structures and has significant promotional value.

[0050] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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. Such 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 this utility model.

Claims

1. A precast beam corbel type double T-plate welded connection node structure, comprising a reinforced concrete precast double T-plate (1) and a reinforced concrete precast beam (2), characterized in that: The lower part of the precast reinforced concrete beam (2) is provided with a corbel (22). The upper surface of the cow leg (22) is fixedly provided with a first embedded iron part (21), which is a rectangular steel plate welded with anchor bars; The top surface of the precast reinforced concrete beam (2) is lower than the final design elevation of the beam top, and the difference is equal to the design thickness of the upper secondary cast-in-place concrete layer (3). The upper part of the stirrups of the precast reinforced concrete beam (2) is exposed on its top surface. The precast reinforced concrete double-T slab (1) has a second embedded iron piece (11) fixedly installed at the lower part of both ends of the rib (12). The second embedded iron piece (11) is a rectangular steel plate with welded anchor bars. The position of the second embedded iron part (11) corresponds to the position of the first embedded iron part (21); During installation, the precast reinforced concrete double-T plate (1) is placed on the corbel (22) of the precast reinforced concrete beam (2), and the second embedded iron part (11) and the first embedded iron part (21) are stacked on top of each other and fixedly connected by welding.

2. The precast beam corbel type double T plate welded connection node structure according to claim 1, characterized in that: The first embedded iron part (21) and the second embedded iron part (11) have several anchor bars welded to their bottom and top surfaces, and the anchor bars are anchored in the concrete of the corresponding precast reinforced concrete beam (2) and precast reinforced concrete double T plate (1).

3. The precast beam corbel type double T plate welded connection node structure according to claim 1 or 2, characterized in that: The first embedded iron part (21) is located at the center of the upper surface of the bracket (22).

4. The precast beam corbel type double T plate welded connection node structure according to claim 1 or 2, characterized in that: The second embedded iron part (11) is located at the center of the lower surface of the end of the plate rib (12).

5. The precast beam corbel type double T plate welded connection node structure according to claim 1, characterized in that: The length of the exposed stirrups on the top surface of the precast reinforced concrete beam (2) meets the anchorage requirements with the upper secondary cast-in-place concrete layer (3).

6. The precast beam corbel type double T plate welded connection node structure according to claim 1, characterized in that: The precast reinforced concrete beam (2) has a cross-sectional dimension of 400mm×1300mm, and the lower two sides of the corbel (22) have a cross-sectional dimension of 220mm in length and 300mm in height. The steel plate of the first embedded iron part (21) has a size of -16mm×220mm×150mm and is welded with 4 ø12 anchor bars; The cross-sectional dimensions of the precast reinforced concrete double-T slab (1) are 2220mm in width, 850mm in height, and 14540mm in length; The steel plate of the second embedded iron part (11) has a size of -16mm×200mm×100mm and is welded with 4 ø8 anchor bars.

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