Large-span arc beam reinforcing arc control device and construction method thereof

Abstract

The present application relates to building construction, especially a large-span arc-shaped beam reinforcement arc control device and its construction method. Including positioning connecting rod, the positioning connecting rod is a straight rod structure, the positioning connecting rod is detachably connected with a plurality of screw rods, the screw rod is perpendicular to the positioning connecting rod, each screw rod is provided with an inner arc control mechanism and an outer arc control mechanism with the same structure; The inner arc control mechanism includes a box body, a drive motor, a drive screw and a jaw assembly, the box body is sleeved on the screw rod, the inner side of the box body top plate is provided with a drive motor, the output shaft of the drive motor is provided with a drive screw, the drive screw is engaged with the screw rod, the jaw assembly is installed at the bottom of the box body, and the jaw assembly includes a reverse U-shaped jaw. The present application avoids the problem that the position of the beam reinforcement deviates during the concrete pouring process, causing the thickness of the reinforcement protective layer to be unqualified, solves the problems of difficult reinforcement binding and positioning of the arc-shaped beam, difficult control and poor construction quality.

Description

Technical Field

[0001] This invention relates to building construction, and in particular to a device for controlling the curvature of steel reinforcement in a large-span curved beam and its construction method. Background Technology

[0002] During the construction and installation of reinforcing bars in curved beams, the positioning of longitudinal reinforcing bars and the control of the concrete cover directly affect the quality of the main structure. Therefore, during the binding of reinforcing bars in curved beams, it is essential to strictly control the curvature and direction of the longitudinal reinforcing bars. After the reinforcing bars are bound, the concrete cover should be properly controlled to avoid affecting the quality of the curved beam structure due to inadequate fixing measures, and even leading to significant quality hazards such as exposed reinforcing bars or an excessively large concrete cover.

[0003] Currently, there is no dedicated device for controlling the reinforcement of curved beams. The traditional approach is as follows: according to the construction drawings, on-site measurement and positioning are carried out, measurement control lines are placed, and the results are checked against the design; first, the longitudinal reinforcing bars and bent-up bars at the bottom of the main beam are threaded through, and the stirrups are separated one by one according to the pre-drawn spacing and fitted with the stirrups; the stirrups for the main and secondary beams are placed; the stirrups are tied to the stirrups at certain intervals; the stirrup spacing is adjusted to meet the design requirements; block or strip spacers are used to control the concrete cover of the beam reinforcement; finally, concrete is poured.

[0004] The binding of reinforcing bars in curved beams requires manual control, as no specialized tools are available. Due to the high strength and weight of the reinforcing bars, controlling the curvature is challenging. During construction, stirrups tend to deviate towards the beam side formwork, resulting in insufficient concrete cover thickness after pouring. Therefore, professional personnel are needed to inspect the binding joints and concrete cover thickness during the binding of curved beam reinforcing bars. This adjustment process is time-consuming and impacts the overall construction quality.

[0005] Chinese utility model patent CN215716583U discloses an adjustable positioning device for column reinforcement, but this utility model cannot adjust the curvature of the reinforcement. Summary of the Invention

[0006] The present invention aims to solve the above-mentioned technical problems, thereby providing a device for controlling the curvature of steel bars in large-span curved beams and its construction method, solving the problems of difficult binding and positioning of steel bars in curved beams, high control difficulty, and poor construction quality.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows:

[0008] A device for controlling the curvature of reinforcing bars in a large-span curved beam includes a positioning connecting rod, which is a straight rod structure. Multiple screw rods are detachably connected to the positioning connecting rod, and the screw rods are perpendicular to the positioning connecting rod. Each screw rod is equipped with an inner curvature control mechanism and an outer curvature control mechanism with identical structures. The inner curvature control mechanism includes a housing, a drive motor, a drive screw, and a claw assembly. The housing is fitted onto the screw rods. The drive motor is installed on the inner side of the top plate of the housing, and the drive screw is mounted on the output shaft of the drive motor. The drive screw meshes with the screw rods. The claw assembly is installed at the bottom of the housing and includes inverted U-shaped claws.

[0009] The construction method for the above-mentioned large-span curved beam reinforcement curvature control device includes the following steps:

[0010] S1. Erect the formwork for the curved beam;

[0011] S2. Rebar cutting;

[0012] S3. Determine the bending nodes of the longitudinal reinforcement of the beam;

[0013] S4. Adjust the position of the screw on the positioning connecting rod so that the position of each screw and the arc control mechanism is consistent with the bending node, and place the entire device above the template system;

[0014] S5, Beam longitudinal reinforcement bending

[0015] The claws of the inner and outer curvature control mechanisms respectively grip the longitudinal reinforcement of the inner and outer beams. The drive motor is started, and the drive motor drives the lead screw to rotate. The lead screw meshes with the screw rod and drives the box to move. The distance between the two curvature control mechanisms is adjusted to meet the spacing of the longitudinal reinforcement of the beams and the curvature requirements. The upper horizontal part of the positioning plate overlaps the top of the side formwork.

[0016] S6. Reinforcing bar binding and concrete pouring.

[0017] Compared with the prior art, the present invention, which adopts the above technical solution, has the following beneficial effects:

[0018] 1) It is easy to operate, has a wide range of applications, can be reused, and has a high rate of reusability;

[0019] 2) The device is detachable, can be transported at any time, and can be installed and used as needed. It has a simple structure, is lightweight, and has a low manufacturing cost.

[0020] 3) It avoids the problem of the reinforcement bars shifting during the concrete pouring process, resulting in an unqualified concrete cover thickness;

[0021] 4) Solve the problems of difficult reinforcement binding and positioning, high control difficulty, and poor construction quality of curved beams;

[0022] 5) During construction, the device can be adjusted in advance according to the drawings and specifications to achieve different curvature requirements. Compared with manual installation and adjustment, this greatly reduces the labor required and speeds up the installation and construction efficiency.

[0023] Furthermore, the optimized solution of the present invention is:

[0024] The claw is fixed to the lower end of the shaft, the upper end of the shaft is inserted into the sleeve, the sleeve and the shaft are connected by a pin, and the sleeve is fixed to the bottom plate of the housing.

[0025] The connection hole between the sleeve and the pin is an arc-shaped elongated hole.

[0026] One end of the screw is fixed to a bushing, which is fitted onto the positioning connecting rod.

[0027] The bushing is fitted with a set screw.

[0028] Both the inner and outer arc control mechanisms have Z-shaped positioning plates installed on opposite sides of their chucks.

[0029] The drive screw has shafts at both ends, which are rotatably connected to the top plate of the housing via bearing seats. A blind hole is provided at the end of the shaft, and the output shaft of the drive motor is connected to the blind hole via a key.

[0030] The positioning connecting rod has a multi-section structure, and adjacent sections of the positioning connecting rod are connected by threads. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0032] Figure 2 This is a front view of the screw, the inner curvature control mechanism, and the outer curvature control mechanism;

[0033] Figure 3 for Figure 2 Top view;

[0034] Figure 4 This is a schematic diagram of the positioning connecting rod;

[0035] Figure 5 This is a schematic diagram of the internal structure of the arc control mechanism;

[0036] Figure 6 A schematic diagram showing the connection between the drive motor, lead screw, and screw rod;

[0037] Figure 7 This is a schematic diagram showing the connection between the shaft, bushing, and chuck assembly.

[0038] Figure 8 This is a sectional view of the connection between the shaft and the bushing.

[0039] Figure 9 This is a schematic diagram of the curved beam formwork system;

[0040] Figure 10 This is a schematic diagram of the equipment construction.

[0041] Figure 11 This is a schematic diagram of the construction section of the device.

[0042] In the diagram: 1. Positioning connecting rod; 2. Bushing; 3. Screw; 4. Inner curvature control mechanism; 4-1. Housing; 4-2. Drive motor; 4-3. Drive screw; 4-4. Bearing seat; 4-5. Claw assembly; 4-5-1. Claw; 4-5-2. Shaft; 4-5-3. Sleeve; 4-5-4. Positioning plate; 4-5-5. Outer curvature control mechanism; 6. Template system; 6-1. Side template; 7. Beam longitudinal reinforcement. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0044] See Figures 1-4 This embodiment is a rebar curvature control device for a large-span curved beam, mainly composed of a positioning connecting rod 1, a bushing 2, a screw rod 3, an inner curvature control mechanism 4, and an outer curvature control mechanism 5. The positioning connecting rod 1 is a circular straight rod with a multi-section structure. Adjacent sections of the positioning connecting rod 1 are connected by threads, allowing for length adjustment according to the length of the curved beam. The positioning connecting rod 1 can also be a round tube to reduce weight.

[0045] One end of the screw 3 is welded with a bushing 2, which is fitted onto the positioning connecting rod 1. Multiple screws 3 are connected to the positioning connecting rod 1 via bushings 2. The screws 3 are perpendicular to the positioning connecting rod 1. The positions of the screws 3 and bushings 2 on the positioning connecting rod 1 can be adjusted to accommodate the bending joints of the beam's longitudinal reinforcement. To secure the adjusted bushings 2, set screws are installed on the bushings 2. The screw 3 can also be a round tube, with a smooth, rounded end near the positioning connecting rod 1.

[0046] Each screw 3 is equipped with an inner arc control mechanism 4 and an outer arc control mechanism 5, both with identical structures. Figures 5-8As shown, the inner curvature control mechanism 4 mainly consists of a housing 4-1, a drive motor 4-2, a drive screw 4-3, a bearing seat 4-4, and a claw assembly 4-5. The housing 4-1 is rectangular and has a split-assembly structure. Its left and right end plates have coaxial circular holes, through which the housing 4-1 is fitted onto the screw 3. The drive motor 4-2 is mounted on the inner side of the top plate of the housing 4-1. The output shaft of the drive motor 4-2 is connected to the drive screw 4-3, and the thread of the drive screw 4-3 meshes with the thread of the screw 3. Both ends of the drive screw 4-3 have shaft heads, which are rotatably connected to the top plate of the housing 4-1 via the bearing seat 4-4. A blind hole is provided on one side of the shaft head of the drive motor 4-2, and the output shaft of the drive motor 4-2 is connected to this blind hole via a key. The drive motor 4-2 drives the drive screw 4-3 to rotate, and the thread of the drive screw 4-3 meshes with the thread of the screw 3, thereby driving the inner curvature control mechanism 4 to move on the screw 3.

[0047] In order to guide the inner curvature control mechanism 4 and the outer curvature control mechanism 5, an axial keyway can be opened at the bottom of the screw 3, and a guide key that slides with the keyway is installed on the bottom plate of the housing 4-1.

[0048] The claw assembly 4-5 is installed at the bottom of the housing 4-1. The claw assembly 4-5 mainly consists of claw 4-5-1, shaft 4-5-2, sleeve 4-5-3, and pin 4-5-4. Claw 4-5-1 is U-shaped and welded to the lower end of shaft 4-5-2. The upper end of shaft 4-5-2 is a stepped shaft structure and is inserted into sleeve 4-5-3. Sleeve 4-5-3 and shaft 4-5-2 are connected by pin 4-5-4. Sleeve 4-5-3 is fixed to the bottom plate of housing 4-1. The connection hole between sleeve 4-5-3 and pin 4-5-4 is an arc-shaped elongated hole, facilitating adjustment of the angle between claw 4-5-1 and housing 4-1 to meet the device's requirements for fixing longitudinal reinforcement 7 of beams with different curvatures. To accommodate longitudinal reinforcement bars 7 of beams with different diameters, the clamp 4-5-1 can also adopt an adjustable structure with a movable wrench.

[0049] On each screw 3, the opposing sides of the claws 4-5-1 of the inner arc control mechanism 4 and the outer arc control mechanism 5 are equipped with positioning plates 4-5-5. The positioning plates 4-5-5 are inverted Z-shaped, with their lower horizontal parts welded to the outer side of the horizontal plate of the claws 4-5-1. In use, the upper horizontal part of the positioning plate 4-5-5 overlaps the top of the side formwork 6-1, and the vertical part is in close contact with the inner side of the side formwork 6-1. The positioning plates 4-5-5 are used to ensure the thickness of the concrete cover for the reinforcing bars.

[0050] Each arc control mechanism's drive motor 4-2 is controlled by a control switch, allowing for flexible adjustment. The drive screw 4-2 of this invention can also employ a structure with a driven gear and a driving gear meshing. The driving gear is mounted on the output shaft of the drive motor 4-2, and the driven gear has a threaded hole and is mounted on the screw 3. Positioning sleeves are fitted onto the screws 3 on both sides of the driven gear. A thrust bearing is installed at the inner end of the positioning sleeve, and the outer end of the positioning sleeve abuts against the end plate of the housing 4-1. One side of the positioning sleeve is fixedly connected to the end plate of the housing 4-1 and fitted with a guide key.

[0051] The construction method for the above-mentioned large-span curved beam reinforcement curvature control device includes the following steps:

[0052] S1, Formwork system for supporting the curved beam 6 ( Figures 9-11 (as shown);

[0053] S2. Rebar cutting;

[0054] S3. Determine the bending node of the longitudinal reinforcement 7 of the beam;

[0055] S4. Adjust the position of the screw 3 of the arc control mechanism on the positioning connecting rod 1 so that the position of each screw 3 is consistent with the bending node, and place the entire device above the template system 6.

[0056] S5, Beam longitudinal reinforcement bending

[0057] The claws 4-5-1 of the inner curvature control mechanism 4 and the outer curvature control mechanism 5 respectively clamp the inner and outer longitudinal reinforcements 7 of the beam. The drive motor 4-2 is started, and the drive motor 4-2 drives the drive screw 4-3 to rotate. The drive screw 4-3 meshes with the screw 3 and drives the housing 4-1 to move. The distance between the two curvature control mechanisms is adjusted to meet the distance of the longitudinal reinforcements 7 of the beam and to meet the curvature requirements. The upper horizontal part of the positioning plate 4-5-5 overlaps the top of the side template 6-1, and the vertical part is close to the inner side of the side template 6-1.

[0058] S6. Reinforcing bar binding and concrete pouring.

[0059] This invention avoids the significant quality problems caused by inadequate control of the protective layer of the reinforcing bars in curved beams, which is a problem in traditional methods. It improves construction quality, reduces the labor intensity of workers, and increases the efficiency of reinforcing bar binding. It solves the problems of difficult positioning, high control difficulty, and poor construction quality of reinforcing bars in curved beams.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A device for controlling the curvature of reinforcing bars in a large-span curved beam, comprising a positioning connecting rod, wherein the positioning connecting rod is a straight rod structure, characterized in that: The positioning connecting rod is detachably connected to multiple screws, which are perpendicular to the positioning connecting rod. Each screw is equipped with an inner arc control mechanism and an outer arc control mechanism with the same structure. The inner curvature control mechanism includes a housing, a drive motor, a drive screw, and a claw assembly. The housing is mounted on the screw. The drive motor is installed on the inner side of the top plate of the housing. The drive screw is installed on the output shaft of the drive motor. The drive screw meshes with the screw. The claw assembly is installed at the bottom of the housing. The claw assembly includes an inverted U-shaped claw. The claw is fixed to the lower end of the shaft, the upper end of the shaft is inserted into the sleeve, the sleeve and the shaft are connected by a pin, and the sleeve is fixed to the bottom plate of the box. The connection hole between the sleeve and the pin is an arc-shaped elongated hole; One end of the screw is fixedly connected to a bushing, which is fitted onto the positioning connecting rod. The bushing is fitted with a set screw; Z-shaped positioning plates are installed on the opposite sides of the claws of both the inner and outer arc control mechanisms. An axial keyway is made at the bottom of the screw, and a guide key that slides with the keyway is installed on the bottom plate of the housing; The drive motor of each arc control mechanism is controlled by a control switch.

2. The device for controlling the curvature of reinforcing bars in a large-span curved beam according to claim 1, characterized in that: The drive screw has shafts at both ends, which are rotatably connected to the top plate of the housing via bearing seats. A blind hole is provided at the end of the shaft, and the output shaft of the drive motor is connected to the blind hole via a key.

3. The device for controlling the curvature of reinforcing bars in a large-span curved beam according to claim 1, characterized in that: The positioning connecting rod has a multi-section structure, and adjacent sections of the positioning connecting rod are connected by threads.

4. A construction method for a large-span curved beam reinforcement curvature control device as described in any one of claims 1-3, comprising the following steps: S1. Erect the formwork for the curved beam; S2. Rebar cutting; S3. Determine the bending nodes of the longitudinal reinforcement of the beam; S4. Adjust the position of the screw on the positioning connecting rod so that the position of each screw and the arc control mechanism is consistent with the bending node, and place the entire device above the template system; S5, Beam longitudinal reinforcement bending The claws of the inner and outer curvature control mechanisms respectively grip the longitudinal reinforcement of the beam on the inner and outer sides. The drive motor is started, and the drive motor drives the lead screw to rotate. The lead screw meshes with the screw rod and drives the box to move. The distance between the two curvature control mechanisms is adjusted to meet the spacing of the longitudinal reinforcement of the beam and the curvature requirements. The upper horizontal part of the positioning plate overlaps the top of the side formwork. S6. Reinforcing steel binding and concrete pouring.

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