Full-prefabricated assembly type prestressed concrete three-T plate and connecting joint

Abstract

The invention discloses a full-prefabricated assembly type prestressed concrete three-T plate and a connecting node, comprising a plurality of concrete three-T plates, and longitudinal connecting nodes and transverse connecting nodes arranged among the plurality of concrete three-T plates, the concrete three-T plate comprises a plurality of ribbed beam reinforcement cages arranged side by side and a floor slab reinforcement mesh erected on the ribbed beam reinforcement cages, beam bottom prestressed tendons are arranged in each ribbed beam reinforcement cage, and the floor slab reinforcement mesh is filled with beam slab concrete. Compared with a traditional multi-rib plate and a composite plate, the composite plate is higher in bearing capacity, smaller in plate thickness, lighter in weight, smaller in field operation amount, simpler in design and more reasonable and efficient in connection joint.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated building technology, and in particular relates to a fully prefabricated prestressed concrete three-T slab and its connection nodes. Background Technology

[0002] Prefabricated buildings have attracted widespread attention because they align with the development trend of industrialized construction. The construction method of factory prefabrication and on-site assembly can realize the concept of "building houses like building cars".

[0003] In prefabricated buildings, apart from steel structures which are naturally prefabricated, precast concrete structures are the mainstream of prefabricated buildings. Compared with cast-in-place concrete structures, precast concrete structures have the advantages of high construction efficiency, less on-site wet work, fewer temporary formwork support measures, lower carbon emissions, and more controllable component quality. However, they also face many challenges in the process of development. The applicant found that, for prefabricated buildings, manufacturing costs, transportation issues, and node connection problems have always been key constraints on the development of prefabricated concrete structures. If the rational division of components and building modules can be achieved, standardized and mechanized manufacturing can be realized, and the research and development and performance testing of connection nodes can be emphasized, the manufacturing, transportation, and node connection problems can be largely solved. However, currently, prefabricated concrete structures mostly use composite beam-slab components to solve connection problems, and the research on connection nodes is mostly focused on beam-column nodes. This has resulted in the relatively lagging development of fully prefabricated floor slabs and their connection nodes, hindering the transformation of prefabricated concrete structures towards fully prefabricated concrete structures with higher construction efficiency, less on-site work, greater environmental friendliness, and more controllable quality. Meanwhile, traditional composite floor slabs, due to their thinness, require a large number of post-cast layers and steel mesh to meet the needs of large spans and heavy loads. Furthermore, the outward protrusion of the steel bars on the composite surface makes it impossible to provide a good working surface for construction machinery (such as construction robots) and material stacking in a timely manner, which seriously affects construction efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art by providing a fully prefabricated prestressed concrete three-T slab and its connection nodes, which have higher load-bearing capacity, thinner slab thickness, lighter weight, less on-site work, simpler design, and more reasonable and efficient connection nodes than traditional multi-ribbed slabs and composite slabs.

[0005] The objective of this invention is achieved through the following technical solution: A fully precast prestressed concrete three-T slab and its connection nodes include multiple parallel rib beam reinforcement cages and floor slab reinforcement mesh erected on the rib beam reinforcement cages. Each rib beam reinforcement cage is provided with bottom prestressing tendons, and the floor slab reinforcement mesh is filled with beam slab concrete.

[0006] In one embodiment, each of the rib beam reinforcement cages is trapezoidal in shape, and the bottom of the rib beam reinforcement cage is connected to the floor slab reinforcement mesh.

[0007] In one embodiment, multiple ribbed steel cages and floor slab steel mesh are pre-cast into whole slabs according to a 3m module, and the weight of a single whole slab is less than 10t.

[0008] In one embodiment, the floor slab reinforcement mesh is further provided with multiple hoisting reinforcement rings.

[0009] The present invention also provides a fully prefabricated prestressed concrete connection node, comprising multiple concrete three-T slabs as described above, and further comprising longitudinal connection nodes and transverse connection nodes disposed between the multiple concrete three-T slabs.

[0010] In one embodiment, the edges and corners of two adjacent concrete 3T slabs are tongue and groove, the upper layer of the concrete 3T slab is recessed, and the lower layer of the concrete 3T slab is protruding to form a post-cast strip template. The longitudinal connection node includes a steel chain ring fitted in the tongue and groove groove, and the post-cast strip template is filled with post-cast concrete.

[0011] In one embodiment, the longitudinal connection node further includes transverse edge bent-up bars and longitudinal bottom edge reinforcing bars.

[0012] In one embodiment, two adjacent concrete three-T slabs are connected longitudinally in a rigid manner by post-casting micro-expansion concrete.

[0013] In one embodiment, the transverse connection node includes longitudinal edge bent-up bars and rib beam connecting stirrups connected thereto, and strip connecting stirrups and strip connecting reinforcing bars are also provided between adjacent longitudinal edge bent-up bars.

[0014] In one embodiment, the transverse connection node further includes ribbed prestressed tendons and a post-cast strip on the transverse beam. The post-cast strip on the transverse beam uses a brick pad on the beam as a template. The brick pad on the beam is set on the frame beam and raised to the longitudinal edge bent-up reinforcement.

[0015] The beneficial effects of this invention are as follows: (1) The traditional prefabricated multi-ribbed slab and prestressed double-T slab with pre-reserved composite layers on the slab surface and then cast on site has been abandoned. Instead, industrial production is carried out directly in the processing plant in units of standard product parts. The products are modularized in 3m. The structural design can be intervened in the product design stage in the form of standard drawings, and modular design and manufacturing can be carried out to achieve integrated design and production. It is convenient to accommodate commonly used transport trucks. At the same time, the use of high-strength steel bars, high-performance concrete and factory pre-tensioning methods can limit the weight of a single product to within 10t, which is convenient for transportation and can avoid expert review before construction.

[0016] (2) In accordance with the principles of uninterrupted connection, equivalent to cast-in-place, local reinforcement, and no formwork or support, this invention adopts a composite structural measure of “open tongue and groove at the edge of the slab + vertical bending of the edge steel bars + steel bar ring connection + local post-cast strip” to achieve the reinforcement and effective connection of the nodes. The connection nodes between adjacent slabs in the span are achieved by using tongue and groove joints to achieve no formwork or support. The goal of uninterrupted connection of steel bars in the span and equivalent cast-in-place floor slab is achieved by welding steel bar rings onto the vertically bent steel bars at the edge and then pouring micro-expansion concrete post-cast strip. The connection nodes on the beams between adjacent slabs are achieved by using the frame beams directly as the bottom formwork and having workers stand directly on the floor slabs to fill the gaps between the rib beams with masonry blocks. The connection nodes on the beams are achieved by using double-layer stirrups at the top and bottom of the adjacent rib beams and stirrups to strengthen the connection between the slab strips between the rib beams. The goal of uninterrupted connection at the ends of the rib beams and uninterrupted connection between the slab strips between different spans is achieved.

[0017] (3) At the corner of the tongue and groove of the plate, only a thin layer of concrete is left, and the upper layer of reinforced concrete is inwardly recessed by a certain length in both directions to realize convenient on-site cutting of the corner to suit column corners; in the cross joint connection node area formed by the four plates in the middle of the span, the corner tongue and groove upper layer shrinkage + arched reinforcing bar + post-poured uniformly distributed concrete construction method is used to realize the effective cooperation between the corner tongue and groove and the arched reinforcing bar, and to realize the reinforced connection of the cross joint connection node area between the plates. Attached Figure Description

[0018] The invention will now be described in more detail with reference to embodiments and the accompanying drawings. Figure 1 A schematic diagram of the structure of the present invention is shown; Figure 2 Showing Figure 1 A magnified schematic diagram of the local structure at point A; Figure 3 A structural schematic diagram of the concrete three-T slab of the present invention is shown; Figure 4 A schematic diagram of the internal structure of the concrete three-T slab of the present invention is shown; Figure 5 A schematic diagram of the longitudinal connection node of the present invention is shown; Figure 6 Showing Figure 5 Enlarged schematic diagram of the local structure at point B; Figure 7 A schematic diagram of the structure of the lateral connection node of the present invention is shown; Figure 8 Showing Figure 7 A magnified schematic diagram of the structure at point C in the middle; Figure 9 This shows a schematic diagram of the post-cast strip on the transverse beam of the present invention; In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0019] Figure label: 1- Concrete 3T slab, 2- Longitudinal connection node, 3- Transverse connection node, 101- Rib beam reinforcement cage, 102- Floor slab reinforcement mesh, 103- Beam and slab concrete, 104- Beam bottom prestressing tendon, 105- Lifting reinforcement ring, 201- Transverse edge bent-up reinforcement, 202- Longitudinal slab bottom edge reinforcement, 203- Reinforcing chain, 204- Post-cast concrete in the trench, 301- Longitudinal edge bent-up reinforcement, 302- Rib beam connection stirrups, 303- Slab strip connection stirrups, 304- Slab strip connection reinforcement, 305- Rib beam prestressing tendon, 306- Transverse beam post-cast strip. Detailed Implementation

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] This invention provides a fully precast prestressed concrete three-T slab, such as... Figures 1 to 4 As shown, it includes multiple parallel rib beam steel cages 101 and floor slab steel mesh 102 erected on the rib beam steel cages 101. Each rib beam steel cage 101 is provided with a bottom prestressing tendon 104. The floor slab steel mesh 102 is filled with beam and slab concrete 103. Each rib beam steel cage 101 has a trapezoidal structure. The bottom of the rib beam steel cage 101 is connected to the floor slab steel mesh 102. Multiple rib beam steel cages 101 and floor slab steel mesh 102 are precast into a whole slab according to a 3m module. The weight of a single whole slab is less than 10t. Multiple hoisting steel rings 105 are also provided on the floor slab steel mesh 102. It should be noted that in this embodiment, the fully precast prestressed concrete three-T slab 1 abandons the traditional practice of reserving a composite layer on the slab surface and then pouring it on site for prefabricated multi-ribbed slabs and prestressed double-T slabs. Instead, it is directly industrialized in the processing plant as a standard product unit. The product is based on a 3m module. The structural design can be intervened in the product design stage using standard drawings, and modular design and manufacturing can be carried out to achieve integrated design and production. This is convenient for commonly used transport trucks to accommodate. At the same time, the use of high-strength steel bars, high-performance concrete and factory pre-tensioning and prestressing methods limits the weight of a single product to within 10t, which facilitates transportation and avoids the need for expert review before construction. This invention also provides a fully precast prestressed concrete connection node, such as... Figures 5 to 9 As shown, it includes multiple concrete three-T slabs 1, as well as longitudinal connection nodes 2 and transverse connection nodes 3 disposed between the multiple concrete three-T slabs 1; Specifically, such as Figure 5 and Figure 6 As shown, the edges and corners of two adjacent concrete three-T slabs 1 are tongue and groove. The upper layer of the concrete three-T slab 1 is recessed and the lower layer of the concrete three-T slab 1 is protruded to form a post-cast strip template. The longitudinal connection node 2 includes a steel chain 203 fitted in the tongue and groove groove. The post-cast strip template is filled with post-cast concrete 204. The longitudinal connection node 2 also includes a transverse edge bent steel bar 201 and a longitudinal bottom edge reinforcing bar 202. It should be noted that in this embodiment, the longitudinal connection node 2 is formed by opening a tongue and groove at the edge of the adjacent concrete three-T slab 1, then tightly splicing the bottom layer of the slab, then fitting a steel chain 203 into the tongue and groove groove, and finally casting micro-expansion concrete on site. That is, the edge steel bars are bent vertically, and the edge and corner concrete are tongue and grooved (i.e., the edge and corner are divided into two layers, the upper layer is recessed by a certain distance, while the lower layer is a thin layer of concrete that protrudes outward). The lower layer of concrete that protrudes outward can directly serve as the formwork for the post-cast strip. The corner can be cut on site to adapt to the corner of the beam-column connection. In the end, it can effectively achieve the effect of no formwork and no support for the connection between the inner slabs. It has the advantages of no formwork, reasonable steel bar layout, uninterrupted steel bar connection, connection strength comparable to cast-in-place, and easy cutting and shaping of the tongue and groove bottom plate. In one embodiment, such as Figures 7 to 9As shown, the longitudinal connection node 2 also includes the transverse edge bent-up steel bar 201 and the longitudinal bottom edge reinforcing bar 202. The two adjacent concrete three-T slabs 1 are connected in a longitudinal continuous rigid connection by post-casting micro-expansion concrete. The transverse connection node 3 includes the longitudinal edge bent-up steel bar 301 and the rib beam connecting stirrup 302 connected thereto. The slab strip connecting stirrup 303 and slab strip connecting reinforcing bar 304 are also provided between the adjacent longitudinal edge bent-up steel bars 301. The transverse connection node 3 also includes the rib beam prestressing tendon 305 and the transverse beam post-cast strip 306. The transverse beam post-cast strip 306 uses the brick pad block on the beam as a template. The brick pad block on the beam is set on the frame beam and raised to the longitudinal edge bent-up steel bar 301. It should be noted that in this embodiment, only a thin layer of concrete is left at the corner of the tongue and groove of the plate edge, and the upper layer of reinforced concrete is recessed in both directions by a certain length to facilitate on-site cutting of the corner to suit column corners; the cross joint connection node area formed by the four plates in the middle of the span utilizes the construction method of upper layer shrinkage of the corner tongue and groove + arched reinforcing bar + post-poured uniformly distributed concrete to achieve effective cooperation between the corner enlarged tongue and groove and the arched reinforcing bar, thereby achieving a strengthened connection in the cross joint connection node area between the plates; Meanwhile, the transverse connection node 3 between adjacent concrete three-T slabs 1 is made of rib beam connecting steel bars, slab strip connecting stirrups 303 and micro-expansion concrete post-casting to achieve longitudinal continuous rigid connection. At the same time, the connection node is strengthened by making full use of the frame main beam and edge brickwork as support. It has the characteristics of simple and efficient connection, clear force path, and no formwork or support required. In order to avoid erecting supports and formwork, the floor slab is fully utilized as the working surface, and as little cast-in-place concrete is used as possible. After all the precast prestressed three-T slabs are hoisted onto the frame beam, bricks are first built on the frame beam to raise it to the edge bent steel bars. Then the stirrups and reinforcing bars of the transverse connection node 3 between adjacent slabs are connected. Finally, the brickwork on the beam is used as a template to pour the post-cast strip on the beam. In this embodiment, a "fully precast prestressed concrete three-T slab and connection node" is adopted. Following the principles of uninterrupted connection, equivalent to cast-in-place construction, local reinforcement, and no formwork or support required, a composite structural measure of "slab edge tongue and groove + vertically bent edge reinforcement + reinforcement ring connection + local post-cast strip" is used to achieve node reinforcement and effective connection. For the connection node between adjacent slabs within the span, a tongue and groove joint is used to achieve no formwork or support required. By welding reinforcement rings onto the vertically bent edge reinforcement and then pouring micro-expansion concrete post-cast strips, the goal of uninterrupted reinforcement connection within the span and equivalent cast-in-place floor slab construction is achieved. For the connection node on the beam between adjacent slabs, after the rib beam rests on the frame beam, the frame beam is directly used as the bottom formwork. Workers stand directly on the floor slab and fill the gaps between the rib beams with masonry blocks, achieving no formwork or support required for the beam connection node. The ends of adjacent rib beams are connected with double-layered stirrups at the top and bottom, and the middle of the slab strips between the rib beams is reinforced with stirrups, achieving the goal of uninterrupted connection at the ends of the rib beams and uninterrupted connection between slab strips between different spans. In this embodiment, the concrete three-T slab 1 is manufactured as a one-way slab that bears the floor load by relying on trapezoidal ribs and prestressed tendons. The net distance between the ribs is limited to within 1m based on the width of the ribs (i.e., within the effective width of the slab strip above the ribs). It has the characteristics of simple design and simple and clear stress. The slabs are connected by steel rings and vertically bent steel bars at the edges, with local reinforcement. It has the characteristics of clear distinction between primary and secondary connecting steel bars and reliable connection. It adopts a 3m modular width, three ribs under the slab and prestressed tensioning construction method, which has the characteristics of smaller deformation and smaller cross-sectional height after stress. At the same time, due to the control of the weight of a single piece and the height and width of the cross-section, multiple pieces can be stacked in one transport. During hoisting, only 4 workers need to complete the installation of the entire floor slab in the span in no more than 3 hoisting operations.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", 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 this 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 this invention.

[0023] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A fully precast prestressed concrete three-T slab, characterized in that, It includes multiple parallel rib beam reinforcement cages and floor slab reinforcement mesh erected on the rib beam reinforcement cages. Each rib beam reinforcement cage is provided with bottom prestressing tendons, and the floor slab reinforcement mesh is filled with beam and slab concrete.

2. The fully precast assembled prestressed concrete three-T slab according to claim 1, characterized in that, Each of the rib beam reinforcement cages has a trapezoidal structure, and the bottom of the rib beam reinforcement cage is connected to the floor slab reinforcement mesh.

3. The fully prefabricated prestressed concrete three-T slab according to claim 1, characterized in that, Multiple rib beam steel cages and floor slab steel mesh are precast into whole slabs according to a 3m module, and the weight of a single whole slab is less than 10t.

4. The fully precast assembled prestressed concrete three-T slab according to claim 1, characterized in that, The floor slab reinforcement mesh is also equipped with multiple hoisting steel rings.

5. A fully precast prestressed concrete connection node, comprising a plurality of concrete three-T slabs as described in any one of claims 1 to 4, characterized in that, It also includes longitudinal connection nodes and transverse connection nodes set between multiple concrete three-T slabs.

6. A fully precast prestressed concrete connection node according to claim 5, characterized in that, The edges and corners of two adjacent concrete 3T slabs are tongue and groove. The upper layer of the concrete 3T slab is recessed and the lower layer is convex to form a post-pouring strip template. The longitudinal connection node includes a steel chain ring fitted in the tongue and groove groove. The post-pouring strip template is filled with post-pouring concrete.

7. A fully prefabricated prestressed concrete connection node according to claim 6, characterized in that, The longitudinal connection node also includes transverse edge bent-up bars and longitudinal bottom edge reinforcing bars.

8. A fully precast prestressed concrete connection node according to claim 5, characterized in that, The two adjacent concrete three-T slabs are connected longitudinally in a rigid manner by post-casting micro-expansion concrete.

9. A fully prefabricated prestressed concrete connection node according to claim 8, characterized in that, The transverse connection node includes longitudinal edge bent-up bars and rib beam connecting stirrups connected thereto. Plate strip connecting stirrups and plate strip connecting reinforcing bars are also provided between adjacent longitudinal edge bent-up bars.

10. A fully prefabricated prestressed concrete connection node according to claim 9, characterized in that, The transverse connection node also includes rib beam prestressed tendons and post-cast strips on the transverse beam. The post-cast strips on the transverse beam use brick pads on the beam as templates. The brick pads on the beam are set on the frame beam and raised to the longitudinal edge bent-up steel bars.

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