A local laminated connecting joint of a fabricated full-precast floor and beam or wall

Abstract

This utility model discloses a partial overlapping connection node between a prefabricated floor slab and a beam or wall. Prefabricated floor slabs are provided on both sides of the upper end of the beam or wall, with a pre-cast strip reserved between the two slabs. A reinforcing cage is installed in the cast-in-place strip. Multiple grooves are spaced at intervals along the length of the beam or wall at the ends of the prefabricated floor slabs. A prefabricated layer is retained at the bottom of the grooves, and some of the reinforcing bars of the prefabricated floor slab extend into the grooves. The grooves on both sides of the prefabricated floor slabs correspond one-to-one. Additional connecting reinforcing bars are provided at the groove positions and connect to the reinforcing bars of the prefabricated floor slabs. This utility model allows for construction on-site with little or no support and requires less on-site concrete pouring.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated building technology, specifically relating to a partial overlapping connection node between a prefabricated floor slab and a beam or wall. Background Technology

[0002] The most commonly used precast floor components in prefabricated buildings are composite floor slabs. Composite floor slabs consist of a lower precast slab and an upper cast-in-place concrete layer. However, composite floor slabs have many problems. For example, the precast slabs of composite floor slabs are relatively thin and are prone to cracking during transportation and hoisting. They also require a lot of support during construction, which leads to increased costs and loss of precast slabs.

[0003] To address the issues associated with composite floor slabs, some standards have proposed a fully precast floor slab that overlaps only at the edges. The main body of this slab is almost entirely precast, with thinner base slabs at both ends, topped by a continuous cast-in-place strip for on-site pouring. While this structure reduces on-site pouring, the thinner end slabs make it difficult to meet the load-bearing requirements during construction. On-site construction requires continuous support and extensive steel reinforcement at the connection points between the precast floor slab and beams or walls. Therefore, this invention proposes a prefabricated, partially overlapping connection point between the precast floor slab and beams or walls that allows for on-site construction with little or no support. Utility Model Content

[0004] The purpose of this utility model is to provide a partially overlapping connection node between prefabricated floor slabs and beams or walls, which can be constructed on site with little or no support and requires less concrete to be poured on site.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A partial overlapping connection node between a prefabricated floor slab and a beam or wall is characterized in that: prefabricated floor slabs are respectively provided on both sides of the upper end of the beam or wall, a cast-in-place strip is reserved between the two prefabricated floor slabs, a reinforcing cage is provided in the cast-in-place strip, multiple grooves are provided at intervals along the length of the beam or wall at the end of the prefabricated floor slab, a prefabricated layer is retained at the bottom of the groove, some of the reinforcing bars of the prefabricated floor slab extend into the groove, the grooves of the two prefabricated floor slabs correspond one-to-one, additional connecting reinforcing bars are provided at the groove positions, and the additional connecting reinforcing bars are connected to the reinforcing bars of the prefabricated floor slab.

[0007] A further technical solution of this utility model is as follows: corbels or temporary supports are provided on both sides of the upper end of the beam or wall, and the end of the fully prefabricated floor slab is supported on the corbels or temporary supports.

[0008] A further technical solution of this utility model is: the additional connecting steel bars include additional transverse bars and additional longitudinal bars, and additional transverse bars and additional longitudinal bars are provided in the groove near the bottom and top surfaces.

[0009] A further technical solution of this utility model is: the steel cage includes stirrups and cast-in-place longitudinal bars, with the stirrups arranged at intervals along the length direction.

[0010] A further technical solution of this utility model is as follows: the steel cage includes U-shaped steel bars and cast-in-place longitudinal bars, the lower end of the U-shaped steel bars is anchored into the beam or wall, and the cast-in-place longitudinal bars are located on the inner side of the upper end of the U-shaped steel bars.

[0011] A further technical solution of this utility model is: the beam is a precast beam, and the wall is a precast wall.

[0012] A further technical solution of this utility model is as follows: Horizontal and longitudinal ribs are provided in the precast floor slab near the bottom and top surfaces, and the horizontal and / or longitudinal ribs near the top surface of the precast floor slab extend into the groove.

[0013] A further technical solution of this utility model is: the additional connecting steel bars are lapped or welded to the steel bars of the fully precast floor slab.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention features a fully prefabricated floor slab with multiple grooves spaced at intervals along the length of beams or walls at its ends. The slab thickness remains constant between the grooves, ensuring the ends of the prefabricated floor slab maintain a high load-bearing capacity and meet construction requirements. It can be directly overlapped onto beams or walls, allowing for minimal or no support at the connection points between the prefabricated floor slab and beams or walls during on-site construction. Furthermore, this invention requires only the pouring of concrete in the pre-reserved cast-in-place strip between the grooves and the prefabricated floor slab on-site, resulting in a smaller amount of concrete poured and fewer on-site steel reinforcement connections. Therefore, this invention fully leverages the advantages of prefabricated construction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the planar structure of Embodiment 1 of this utility model;

[0017] Figure 2 yes Figure 1 A cross-sectional view of position AA in the middle;

[0018] Figure 3 yes Figure 1 A cross-sectional view of the BB position in the middle;

[0019] Figure 4 yes Figure 1 A cross-sectional view of the CC position in the middle;

[0020] Figure 5 This is a cross-sectional schematic diagram of Embodiment 2 of this utility model at position AA;

[0021] Figure 6 This is a cross-sectional schematic diagram of Embodiment 2 of this utility model at position BB;

[0022] Figure 7 This is a cross-sectional view of the third embodiment of the present invention at position CC.

[0023] Meaning of the labels in the attached diagram:

[0024] 1-Fully precast floor slab; 1.1-Floor slab transverse reinforcement; 1.2-Floor slab longitudinal reinforcement; 1.3-Precast layer; 2-Precast wall; 3-Additional connecting reinforcement; 3.1-Additional transverse reinforcement; 3.2-Additional longitudinal reinforcement; 4-Groove; 5-Corner or temporary support; 6-Precast beam; 6.1-Concave-convex surface; 7-Dowel bar; 8-Cast-in strip; 9-Reinforcement cage; 9.1-Stirrups; 9.2-Cast-in strip longitudinal reinforcement; 9.3-U-shaped reinforcement. Detailed Implementation

[0025] The present invention will be further described below with reference to embodiments.

[0026] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0027] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0029] Example 1:

[0030] like Figures 1 to 4The diagram shows a partial overlap connection node between the prefabricated floor slab 1 and the wall in this embodiment. The wall is a prefabricated wall 2. Prefabricated floor slabs 1 are provided on both sides of the upper end of the prefabricated wall 2. Corbels or temporary supports 5 are provided on both sides of the upper end of the prefabricated wall 2. The ends of the prefabricated floor slabs 1 on both sides are supported on the corbels or temporary supports 5.

[0031] Multiple grooves 4 are provided at intervals along the length of the precast wall at the end of the precast floor slab 1, that is, grooves 4 are partially reserved at the end of the precast floor slab 1. The bottom of the groove 4 retains the precast layer 1.3, that is, the groove 4 does not penetrate downwards, and the top and sides of the groove 4 are open. The grooves 4 on both sides of the precast floor slab 1 correspond one-to-one, and additional connecting steel bars 3 are provided at the groove 4 positions. The additional connecting steel bars 3 in this embodiment include additional horizontal bars 3.1 and additional longitudinal bars 3.2. Additional horizontal bars 3.1 and additional longitudinal bars 3.2 are provided in the groove 4 near the bottom and top surfaces, and the two ends of the additional horizontal bars 3.1 extend into the grooves 4 on both sides of the precast floor slab 1.

[0032] The precast floor slab 1 is provided with horizontal floor slab reinforcement 1.1 and vertical floor slab reinforcement 1.2 near the bottom and top surfaces. Part of the horizontal floor slab reinforcement 1.1 near the top surface of the precast floor slab 1 extends into the groove 4. Additional connecting steel bars 3 are connected to the steel bars of the precast floor slab 1 that extend into the groove 4. The connection method can be lap splicing or welding.

[0033] A cast-in-place strip 8 is reserved between the two precast floor slabs 1 on both sides, and the cast-in-place strip 8 is connected to the groove 4. A steel cage 9 is provided in the cast-in-place strip 8. In this embodiment, the steel cage 9 includes stirrups 9.1 and longitudinal bars 9.2 of the cast-in-place strip. The stirrups 9.1 are arranged at intervals along the length direction, and the longitudinal bars 9.2 of the cast-in-place strip are respectively connected to the inner side of the four corners of the stirrups 9.1.

[0034] The construction steps for the connection node in this embodiment are as follows:

[0035] Step 1: Prepare fully prefabricated floor slabs 1 and prefabricated walls 2 in the factory. According to the major drawings, reserve grooves 4 at the ends of the fully prefabricated floor slabs 1.1. Part of the floor slab horizontal reinforcement 1.1 extends into the grooves 4.

[0036] Step 2: Hoist and install the precast floor slab 1 into place at the construction site and secure it temporarily.

[0037] Step 3: Place additional connecting steel bars 3 at the corresponding position of groove 4;

[0038] Step 4: Tie or weld the additional connecting steel bars 3 to the steel bars extending into the groove 4 of the fully precast floor slab 1;

[0039] Step 5: Pour concrete or grout into the cast-in-place strip 8 and groove 4 to cast the precast floor slab 1 and the precast wall 2 together.

[0040] like Figure 2 As shown, at the connection node, the precast walls 2 of the upper and lower layers are also connected by dowel bars 7. The dowel bars 7 pass through the connection node, and the upper and lower ends of the dowel bars 7 are anchored into the precast walls 2 of the upper and lower layers respectively.

[0041] Example 2:

[0042] like Figure 5 and Figure 6 As shown, the connection node in Embodiment 2 is the connection between the precast floor slab 1 and the beam, which is a precast beam 6. The upper ends of the precast beam 6 are respectively provided with corbels or temporary supports 5. The positions of the corbels or temporary supports 5 are lower than the upper surface of the precast beam 6. The ends of the precast floor slabs 1 on both sides are supported on the corbels or temporary supports 5. The upper surface of the precast beam 6 is a concave-convex surface 6.1.

[0043] The steel cage 9 in this embodiment includes U-shaped steel bars 9.3 and cast-in-place longitudinal bars 9.2. The U-shaped steel bars 9.3 are upside down on the upper end of the precast beam 6. During factory prefabrication, the lower end of the U-shaped steel bars 9.3 is anchored into the precast beam 6. The cast-in-place longitudinal bars 9.2 are connected to the inner side of the upper end of the U-shaped steel bars 9.3.

[0044] Example 3:

[0045] like Figure 7 As shown in Embodiment 3, the longitudinal reinforcement 1.2 of the precast floor slab 1 also extends into the groove 4.

[0046] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A partially overlapping connection node between a prefabricated floor slab and a beam or wall, characterized in that: Fully precast floor slabs are provided on both sides of the upper end of the beam or wall. A cast-in-place strip is reserved between the two sides of the fully precast floor slabs. A reinforcing cage is provided in the cast-in-place strip. Multiple grooves are provided at intervals along the length of the beam or wall at the end of the fully precast floor slab. The bottom of the groove retains a precast layer. Some of the reinforcing bars of the fully precast floor slab extend into the groove. The grooves of the fully precast floor slabs on both sides correspond one-to-one. Additional connecting reinforcing bars are provided at the groove positions. The additional connecting reinforcing bars are connected to the reinforcing bars of the fully precast floor slab.

2. The partial overlapping connection node between the prefabricated floor slab and beam or wall as described in claim 1, characterized in that: The upper ends of the beams or walls are respectively provided with corbels or temporary supports, and the ends of the fully prefabricated floor slabs are supported on the corbels or temporary supports.

3. The partial overlapping connection node between the prefabricated floor slab and beam or wall as described in claim 1, characterized in that: The additional connecting reinforcement includes additional transverse reinforcement and additional longitudinal reinforcement, which are provided in the groove near the bottom and top surfaces.

4. The partial overlapping connection node between the prefabricated floor slab and beam or wall as described in claim 1, characterized in that: The steel cage includes stirrups and cast-in-place longitudinal reinforcement bars, with the stirrups arranged at intervals along the length direction.

5. The partial overlapping connection node between the prefabricated floor slab and beam or wall as described in claim 1, characterized in that: The steel cage includes U-shaped steel bars and cast-in-place longitudinal bars. The lower end of the U-shaped steel bars is anchored into the beam or wall, and the cast-in-place longitudinal bars are located inside the upper end of the U-shaped steel bars.

6. The partial overlapping connection node between the prefabricated floor slab and beam or wall according to claim 1, characterized in that: The beams are precast beams, and the walls are precast walls.

7. The partial overlapping connection node between the prefabricated floor slab and beam or wall according to claim 1, characterized in that: The precast floor slab is provided with horizontal and vertical ribs near the bottom and top surfaces. The horizontal and / or vertical ribs near the top surface of the precast floor slab extend into the groove.

8. The partial overlapping connection node between the prefabricated floor slab and beam or wall according to claim 1, characterized in that: The additional connecting steel bars are lapped or welded to the steel bars of the precast floor slab.

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