A construction column rebar-free device

Abstract

This utility model relates to the field of structural column construction technology, aiming to solve the problems of existing technologies where drilling holes for longitudinal reinforcement in structural columns via rebar anchoring easily conflicts with the main reinforcement, and the rebar length cannot be guaranteed; rebar cannot be fixed and quality cannot be guaranteed via pre-embedding; and the length extending beyond the bottom of the formwork during pre-embedding increases the difficulty of formwork erection and dismantling. This utility model provides a rebar-free device for structural columns, including a sleeve and a detachable sleeve fixing component. The sleeve is placed on the top surface of the bottom formwork of the beam / slab, and the detachable sleeve fixing component is placed on the bottom surface of the bottom formwork. One end of the detachable sleeve fixing component passes through the bottom formwork and connects to the sleeve, fixing the sleeve to the bottom formwork. The upper part of the sleeve connects to the pre-embedded reinforcement at the lower end of the structural column. The detachable sleeve fixing component is detachably connected to the sleeve. After the beam / slab concrete is poured and formed, the detachable sleeve fixing component is removed, and the lower part of the sleeve connects to the upper end of the structural column connecting reinforcement. This utility model ensures the quality of the reinforcement by reliably connecting the reinforcement to the sleeve.

Description

Technical Field

[0001] This utility model relates to the field of structural column construction technology, and more specifically, to a structural column rebar-free device. Background Technology

[0002] Currently, there are two main methods for pre-installing longitudinal reinforcement in structural columns: rebar anchoring and pre-embedding. Rebar anchoring presents several challenges due to the dense arrangement of main reinforcement bars in structural beams. These include conflicts between the anchoring drill holes and the main reinforcement bars, the risk of drilling oblique holes or hitting reinforcement bars within beams and slabs, and the inability to guarantee the required anchoring length on thin slabs. These issues can easily lead to structural quality problems. Furthermore, the numerous steps involved in rebar anchoring significantly impact quality due to human factors, such as positioning errors, insufficient drilling depth, failure to clean the holes after drilling, improper mixing of the anchoring adhesive, and lack of post-anchoring protection. Additionally, insufficient personnel and the need to wait for the adhesive to reach its full strength after anchoring can delay secondary structure construction and affect the overall project schedule. For embedded steel bars, on the one hand, the embedded steel bars cannot be fixed firmly, which can easily cause the steel bars to skew during concrete pouring and make it impossible to guarantee the quality of the embedded steel bars. On the other hand, since the structural column steel bars are required to meet the lap length of 60cm according to the specifications, if the length of the steel bars extending beyond the bottom of the formwork is too long, it will increase the difficulty of formwork erection and dismantling, thereby reducing construction efficiency. Utility Model Content

[0003] The present invention aims to provide a rebar-free device for structural columns, in order to solve the problems in the prior art where drilling holes for pre-reserved longitudinal reinforcement of structural columns by rebar installation is prone to conflict with the main reinforcement and the length of the rebar cannot be guaranteed. The rebar cannot be fixed by pre-embedding and the quality cannot be guaranteed. The length extending beyond the bottom of the formwork during pre-reservation is too long, which increases the difficulty of construction formwork support and dismantling.

[0004] This utility model is achieved using the following technical solution:

[0005] This utility model provides a structural column rebar-free device, including a sleeve and a detachable sleeve fixing component. The sleeve is placed on the top surface of the bottom formwork of the beam and slab, and the detachable sleeve fixing component is placed on the bottom surface of the bottom formwork of the beam and slab. One end of the detachable sleeve fixing component passes through the bottom formwork of the beam and slab and is connected to the sleeve, thereby fixing the sleeve on the bottom formwork of the beam and slab. The upper part of the sleeve is connected to the pre-embedded steel bars at the lower end of the structural column.

[0006] The detachable sleeve fixing component is detachably connected to the sleeve. After the beam and slab concrete is poured and formed, the detachable sleeve fixing component is removed, and the lower part of the sleeve is connected to the upper end of the structural column and the reinforcing bar.

[0007] As a preferred technical solution:

[0008] The sleeve is a threaded sleeve with an internal thread, and the detachable sleeve fixing component has an external thread. The detachable sleeve fixing component is connected to the sleeve by the thread.

[0009] As a preferred technical solution:

[0010] The ends of the pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column are both provided with external threads. The pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column are both connected to the sleeve by threads.

[0011] As a preferred technical solution:

[0012] The pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column are not limited to being connected to the sleeve by threads; other methods that can achieve a fixed connection are also acceptable.

[0013] As a preferred technical solution:

[0014] The lengths of the pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column screwed into the sleeve are both 1 / 2 of the length of the sleeve itself.

[0015] As a preferred technical solution:

[0016] Holes are provided on the bottom template of the beam slab. One end of the detachable sleeve fastener passes through the hole and is connected to the sleeve. The other end of the detachable sleeve fastener abuts against the bottom surface of the bottom template of the beam slab.

[0017] As a preferred technical solution:

[0018] The structural column rebar-free device also includes a positioning plate with positioning holes. The positions of the positioning holes match the positions of the structural column rebars, and the holes on the bottom formwork of the beam and slab correspond to the positions of the positioning holes.

[0019] As a preferred technical solution:

[0020] The positioning plate is arranged between the detachable sleeve fastener and the bottom template of the beam slab, and one end of the detachable sleeve fastener passes through the positioning plate and the bottom template of the beam slab in sequence.

[0021] As a preferred technical solution:

[0022] A gasket is fixedly connected to the bottom of the sleeve. The gasket has a through hole with a diameter equal to that of the sleeve. The gasket is placed on the top surface of the bottom template of the beam slab.

[0023] As a preferred technical solution:

[0024] Both the sleeve and the gasket are made of metal, and the gasket is welded to the bottom of the sleeve.

[0025] As a preferred technical solution:

[0026] The detachable sleeve fastener uses bolts that are compatible with the threaded sleeve.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0028] 1. This utility model's structural column rebar-free device is used in structural column construction. A pre-embedded connector consisting of a threaded sleeve and a washer is fixed to the bottom formwork of the beam slab before concrete pouring using bolts. This reliably connects the pre-embedded rebar at the lower end of the structural column to the threaded sleeve, effectively embedding the rebar in the beam slab and securing it. This prevents displacement and tilting of the pre-embedded rebar during concrete pouring, ensuring the connection quality of the structural column rebar and guaranteeing that the pull-out force meets design and specification requirements. It solves the problems of insufficient floor slab thickness where traditional rebar installation methods cannot guarantee rebar length and pull-out force. It also addresses the issue of unstable construction quality of pre-embedded rebar in structural columns. Furthermore, compared to drilling rebar installation, this utility model eliminates the need for drilling and avoids conflict with the main reinforcement bars.

[0029] 2. This utility model uses bolts to fix the threaded sleeve to the bottom formwork of the beam and slab. After the beam and slab concrete is poured and formed, the bolts and the bottom formwork can be removed. When installing the upper connecting steel bars of the structural column, simply screw the upper connecting steel bars of the structural column into the threaded sleeve. The connection with the threaded sleeve is reliable, convenient, quick, and of higher quality. This ensures the connection quality of the upper connecting steel bars of the structural column and guarantees that the pull-out force meets the design and specification requirements. It truly solves the problem of unstable construction quality of the pre-embedded steel bars of the structural column and realizes the elimination of rebar installation for the longitudinal steel bars of the structural column. At the same time, it avoids the excessive length of the pre-embedded steel bars of the upper connecting steel bars of the structural column extending beyond the bottom of the formwork, reducing the difficulty of formwork erection and dismantling and improving construction efficiency.

[0030] 3. This utility model reliably connects the pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column to the threaded sleeve. It is easy to operate and has stable quality. It realizes the elimination of rebar installation for the longitudinal steel bars of the structural column, while ensuring that the tensile strength of the pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column meets the design requirements.

[0031] 4. The structural column rebar-free device of this utility model can realize convenient and quick construction in the early stage and ensure the construction quality of the structural column in the later stage.

[0032] 5. This utility model uses a positioning plate to precisely drill holes in the bottom formwork of the beam and slab, ensuring accurate positioning of the reinforcing bars. During the construction of the structural column reinforcing bars, it can not only accurately position the pre-embedded reinforcing bars at the bottom of the structural column and the connecting reinforcing bars at the top of the structural column, but also make the operation convenient and quick, which helps to improve construction efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the installation of the structural column rebar-free device described in this utility model.

[0034] Figure 2 This is a schematic diagram showing the connection between the upper end connecting steel bar and the threaded sleeve of the structural column described in this utility model.

[0035] Figure 3 This is a schematic diagram of the connection between the threaded sleeve and the gasket described in this utility model.

[0036] Figure 4 This is a top view of the threaded sleeve and gasket described in this utility model.

[0037] Figure 5 This is a schematic diagram of the bolt described in this utility model.

[0038] Figure 6 This is a schematic diagram of the pre-embedded reinforcing bars at the lower end of the structural column according to the present invention.

[0039] Figure 7 This is a schematic diagram of the upper end connecting steel bars of the structural column described in this utility model.

[0040] Figure 8 This is a schematic diagram of the positioning plate described in this utility model.

[0041] Icons: 1-Embedded connector, 2-Removable sleeve fastener, 3-Positioning plate, 4-Beam and slab formwork, 5-Embedded steel bar at the bottom of the structural column, 6-Connecting steel bar at the top of the structural column, 7-Threaded sleeve, 8-Shim, 9-Beam and slab concrete, 10-External thread, 11-Positioning hole, 12-Bottom formwork of the beam and slab. Detailed Implementation

[0042] 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.

[0043] Example 1

[0044] like Figure 1 , Figure 3 and Figure 4 As shown, this embodiment proposes a non-rebar-installation device for structural columns, including a pre-embedded connector 1. The pre-embedded connector 1 includes a threaded sleeve 7 and a washer 8. The threaded sleeve 7 has an internal thread and is used to be fixedly installed on the top surface of the bottom formwork 12 of the beam slab. The upper part of the threaded sleeve 7 is threadedly connected to a pre-embedded steel bar 5 at the lower end of the structural column. The lower end of the pre-embedded steel bar 5 at the lower end of the structural column extends into the threaded sleeve 7 and is threadedly connected to it, thereby realizing the pre-embedding of the pre-embedded steel bar 5 at the lower end of the structural column. The lower end of the pre-embedded steel bar 5 at the lower end of the structural column has an external thread 10, such as... Figure 6 As shown.

[0045] like Figure 1 As shown, the structural column rebar-free device also includes a detachable sleeve fixing component 2. The detachable sleeve fixing component 2 is installed on the bottom surface of the beam and slab bottom formwork 12. The beam and slab bottom formwork 12 has a hole. One end of the detachable sleeve fixing component 2 passes through the hole and extends into the interior of the threaded sleeve 7, and is threadedly connected to the lower part of the threaded sleeve 7. The detachable sleeve fixing component 2 is provided with an external thread to facilitate engagement with the internal thread on the threaded sleeve 7. The other end of the detachable sleeve fixing component 2 abuts against the bottom surface of the beam and slab bottom formwork 12, thereby realizing the fixed installation of the threaded sleeve 7 on the beam and slab bottom formwork 12 by the detachable sleeve fixing component 2.

[0046] The detachable sleeve fastener 2 can be made of bolts that are compatible with the threaded sleeve 7, such as... Figure 5 As shown.

[0047] Preferred, such as Figure 1 and Figure 8 As shown, the structural column rebar-free device also includes a positioning plate 3, on which positioning holes 11 are provided. The position of the positioning holes 11 matches the position of the structural column rebar. Holes are made on the bottom formwork 12 of the beam and slab according to the position of the positioning holes 11.

[0048] The positioning plate 3 is arranged between the detachable sleeve fixing member 2 and the beam bottom template 12. One end of the detachable sleeve fixing member 2 passes through the positioning plate 3 and the beam bottom template 12 in sequence and is connected to the threaded sleeve 7. Preferably, the positioning plate 3 can be made of steel plate.

[0049] By pre-drilling holes in the positioning plate 3 and then placing the positioning plate 3 on the bottom template 12 of the beam and slab, the positioning plate 3 can ensure that the threaded sleeve 7 and the reinforcing bar are accurately positioned without deviation.

[0050] like Figure 2As shown, the detachable sleeve fixing component 2 can be removed. After concrete is poured into the beam and slab formwork 4 and the beam and slab concrete 9 is formed, and the pre-embedded steel bar 5 at the lower end of the structural column is embedded in the beam and slab concrete 9, the detachable sleeve fixing component 2 and the bottom formwork 12 of the beam and slab are removed, and the positioning plate 3 is taken off. One end of the upper end connecting steel bar 6 of the structural column is inserted into the threaded sleeve 7 and connected to the threaded sleeve 7 by threads. The upper end of the upper end connecting steel bar 6 of the structural column is provided with an external thread 10, such as... Figure 7 As shown.

[0051] like Figure 3 and Figure 4 As shown, the bottom of the threaded sleeve 7 is fixedly connected to the gasket 8. The gasket 8 has a through hole with a diameter equal to that of the threaded sleeve 7, ensuring that the interior of the threaded sleeve 7 remains open. This facilitates the connection of the pre-embedded reinforcing bar 5 at the lower end of the structural column, the detachable sleeve fixing member 2, and the connecting reinforcing bar 6 at the upper end of the structural column. The gasket 8 is placed on the top surface of the bottom formwork 12 of the beam and slab, making it easy to stably place the threaded sleeve 7 on the bottom formwork 12 and facilitating the installation of the threaded sleeve 7. The gasket 8 not only effectively seals the gaps in the formwork to prevent grout leakage, but also ensures that the threaded sleeve 7 is more securely fixed to the bolt.

[0052] Both the threaded sleeve 7 and the washer 8 are made of metal, with the washer 8 welded to the bottom of the threaded sleeve 7. The threaded sleeve 7 is made of No. 45 round steel, and its dimensions are compatible with the pre-embedded reinforcing bar 5 at the lower end of the structural column and the connecting reinforcing bar 6 at the upper end of the structural column. The washer 8 is a 2mm thick annular galvanized steel washer.

[0053] The method for constructing pre-reinforced steel bars in structural columns using the aforementioned rebar-free construction device includes the following steps:

[0054] S1: Fabricate embedded connector 1, which includes threaded sleeve 7 and gasket 8;

[0055] Weld the gasket 8 to the bottom of the threaded sleeve 7, with a welding height of not less than 2mm.

[0056] Among them, the outer diameter D and length L of the threaded sleeve 7 must meet the relevant requirements of the ribbed rolled straight thread sleeve 7 in Table A.1 of "Sleeves for Mechanical Connection of Reinforcing Bars" JG / T163-2013. The sleeve must be compatible with the diameter of the reinforcing bars in the structural column, and is generally used for reinforcing bars of φ12 and φ14.

[0057] S2: Fabricate the pre-embedded steel bar 5 at the lower end of the structural column and the connecting steel bar 6 at the upper end of the structural column;

[0058] Make a threaded end (external thread 10) at the end of the reinforcing bar, and cut the end of the reinforcing bar flat with an abrasive saw. The length of the threaded end is 1 / 2 of the length of the threaded sleeve 7, and the limit deviation of the threaded end length is 0~2P (P is the pitch).

[0059] S3: Make positioning plate 3;

[0060] Positioning plate 3 is made of 5mm thick galvanized steel sheet, and its size matches the structural column detail. φ15mm round holes are opened on the steel plate, and the position and number of round holes are adapted to the structural column detail.

[0061] S4: Erect beam and slab formwork 4 and make holes in the bottom formwork 12 of the beam and slab;

[0062] The beam and slab formwork 4 uses 15mm thick wooden formwork. After the position of the structural column is determined on the erected beam and slab formwork 4 (i.e., after the control line of the structural column is measured and marked), the positioning plate 3 is placed on the bottom formwork 12 of the beam and slab and holes are made on the bottom formwork 12 of the beam and slab. The hole positions on the bottom formwork 12 of the beam and slab are compatible with the hole positions on the positioning plate 3.

[0063] S5: Install the pre-embedded connector 1;

[0064] Place the pre-embedded connector 1 at the top opening of the bottom template 12 of the beam and slab, place the positioning plate 3 at the bottom opening of the bottom template, and then pass one end of the bolt through the positioning plate 3 and the bottom template 12 of the beam and slab in sequence, and screw it into the threaded sleeve 7 to fix the pre-embedded connector 1 firmly on the bottom template 12 of the beam and slab.

[0065] The bolts are 4.6 grade ordinary bolts, and the specifications and models are compatible with the threaded sleeve 7. The thread length of the bolts is 30mm.

[0066] S6: Binding beam and slab reinforcement;

[0067] After the pre-embedded connector 1 and bolts are securely installed, the beam and slab reinforcement is tied.

[0068] S7: Install and tie the pre-embedded steel bars 5 at the bottom of the structural column;

[0069] Screw the lower end of the pre-embedded steel bar 5 at the bottom of the structural column into the threaded sleeve 7, with the screwing depth not exceeding 1 / 2 of the length of the threaded sleeve 7. After the pre-embedded steel bar 5 at the bottom of the structural column is installed, in order to prevent tilting during pouring, tie it securely to the beam and slab reinforcement. The pre-embedded steel bar 5 at the bottom of the structural column should be 600mm above the finished surface of the beam and slab structure.

[0070] S8: Pouring concrete for beams and slabs;

[0071] S9: After the concrete of the beam and slab 9 has been cured to the design strength, remove the bolts, positioning plate 3 and bottom formwork 12 of the beam and slab;

[0072] S10: Install the upper connecting steel bar 6 of the structural column;

[0073] Screw the upper connecting steel bar 6 of the structural column into the threaded sleeve 7, with the screwing depth being 1 / 2 of the length of the threaded sleeve 7 and the exposed length being 600mm.

[0074] S11: Binding the steel reinforcement cage for the structural column, constructing the structural column.

[0075] This utility model discloses a structural column rebar-free device for structural column construction. A pre-embedded connector 1, consisting of a threaded sleeve 7 and a washer 8, is fixed to the bottom formwork 12 of the beam slab before the concrete 9 is poured. This reliably connects the pre-embedded steel bar 5 at the lower end of the structural column to the threaded sleeve 7, effectively embedding the pre-embedded steel bar 5 in the beam slab and fixing it securely. This prevents displacement and tilting of the pre-embedded steel bar 5 during the concrete 9 pouring process, ensuring the connection quality of the structural column rebar and guaranteeing that the pull-out force meets design and specification requirements. It solves the problems of insufficient floor slab thickness where traditional rebar installation methods cannot guarantee the rebar length and pull-out force. It also addresses the issue of unstable construction quality of pre-embedded rebar in structural columns. Furthermore, compared to drilling rebar installation, this utility model eliminates the need for drilling and avoids conflict with the main reinforcement bars.

[0076] This utility model uses bolts to fix the threaded sleeve 7 to the bottom formwork 12 of the beam slab. After the concrete 9 of the beam slab is poured and formed, the bolts and the bottom formwork 12 can be removed. When installing the upper connecting steel bar 6 of the structural column, simply screw the upper connecting steel bar 6 into the threaded sleeve 7. The connection with the threaded sleeve 7 is reliable, convenient, quick, and of higher quality. This ensures the connection quality of the upper connecting steel bar 6 of the structural column and guarantees that the pull-out force meets the design and specification requirements. It truly solves the problem of unstable construction quality of the pre-embedded steel bar of the structural column and realizes the elimination of rebar installation for the longitudinal steel bar of the structural column. At the same time, it avoids the excessive length of the upper connecting steel bar of the structural column extending out of the bottom of the formwork, reduces the difficulty of formwork support and dismantling, and improves construction efficiency.

[0077] This utility model reliably connects the pre-embedded steel bar 5 at the lower end of the structural column and the connecting steel bar 6 at the upper end of the structural column to the threaded sleeve 7. It is easy to operate and has stable quality. It realizes the elimination of rebar installation for the longitudinal steel bars of the structural column, while ensuring that the tensile strength of the pre-embedded steel bar 5 at the lower end of the structural column and the connecting steel bar 6 at the upper end of the structural column meets the design requirements.

[0078] The structural column rebar-free device of this utility model enables convenient and quick construction in the early stage, and ensures the quality of structural column construction in the later stage.

[0079] This utility model uses a positioning plate 3 to precisely drill holes in the bottom formwork 12 of the beam and slab, ensuring accurate positioning of the reinforcing bars. During the construction of the structural column reinforcing bars, it can not only accurately position the pre-embedded reinforcing bars 5 at the lower end of the structural column and the connecting reinforcing bars 6 at the upper end of the structural column for construction, but also make the operation convenient and quick, which helps to improve construction efficiency.

[0080] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rebar-free structural column installation device, characterized in that: It includes a sleeve and a detachable sleeve fastener. The sleeve is placed on the top surface of the bottom formwork of the beam and slab, and the detachable sleeve fastener is placed on the bottom surface of the bottom formwork of the beam and slab. One end of the detachable sleeve fastener passes through the bottom formwork of the beam and slab and is connected to the sleeve to fix the sleeve on the bottom formwork of the beam and slab. The upper part of the sleeve is connected to the pre-embedded steel bars at the lower end of the structural column. The detachable sleeve fixing component is detachably connected to the sleeve. After the beam and slab concrete is poured and formed, the detachable sleeve fixing component is removed, and the lower part of the sleeve is connected to the upper end of the structural column and the reinforcing bar.

2. The structural column rebar-free device according to claim 1, characterized in that: The sleeve is a threaded sleeve with an internal thread, and the detachable sleeve fixing component has an external thread. The detachable sleeve fixing component is connected to the sleeve via the thread.

3. The structural column rebar-free device according to claim 2, characterized in that: The ends of the pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column are both provided with external threads. The pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column are both connected to the sleeve by threads.

4. The structural column rebar-free device according to claim 3, characterized in that: The lengths of the pre-embedded steel bars at the lower end of the structural column and the connecting steel bars at the upper end of the structural column screwed into the sleeve are both 1 / 2 of the length of the sleeve itself.

5. The structural column rebar-free device according to claim 1, characterized in that: Holes are provided on the bottom template of the beam slab. One end of the detachable sleeve fastener passes through the hole and is connected to the sleeve. The other end of the detachable sleeve fastener abuts against the bottom surface of the bottom template of the beam slab.

6. The structural column rebar-free device according to claim 5, characterized in that: The structural column rebar-free device also includes a positioning plate with positioning holes. The positions of the positioning holes match the positions of the structural column rebars, and the holes on the bottom formwork of the beam and slab correspond to the positions of the positioning holes.

7. The structural column rebar-free device according to claim 6, characterized in that: The positioning plate is arranged between the detachable sleeve fastener and the bottom template of the beam slab, and one end of the detachable sleeve fastener passes through the positioning plate and the bottom template of the beam slab in sequence.

8. The structural column rebar-free device according to claim 1, characterized in that: A gasket is fixedly connected to the bottom of the sleeve. The gasket has a through hole with a diameter equal to that of the sleeve. The gasket is placed on the top surface of the bottom template of the beam slab.

9. The structural column rebar-free device according to claim 8, characterized in that: Both the sleeve and the gasket are made of metal, and the gasket is welded to the bottom of the sleeve.

10. The structural column rebar-free device according to claim 2, characterized in that: The detachable sleeve fastener uses bolts that are compatible with the threaded sleeve.

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