Prefabricated box girder formwork rapid turnover steel construction device

Abstract

This invention relates to a rebar construction device for rapid turnover of precast box girder formwork, belonging to the field of precast box girder construction technology. It includes a main body and connecting rods (8) spaced apart. The main body comprises a base (1), columns (2), telescopic devices (5), and support rods (3). The columns (2) are positioned facing each other, with their lower ends hinged to the base (1), allowing the columns (2) to rotate inwards. The support rods (3) are spaced apart on the inner sidewalls of the columns (2) and facing each other. The upper ends of the columns (2) are connected via the telescopic devices (5), and adjacent columns (2) are connected as a whole via the connecting rods (8). This device does not occupy the bottom formwork (12). Rebar (13) is tied first, and after completion, the bottom formwork (12) is inserted, the telescopic devices (5) are retracted, and the rebar cage is positioned. The device's side formwork is then removed for installation. This solves the problem of existing methods where the bottom formwork is laid first and then the rebar is tied, resulting in the formwork being idle during the rebar tying construction period, and the difficulty of rebar tying without a platform.

Description

Technical Field

[0001] This invention relates to a steel reinforcement construction device for rapid turnover of precast box girder formwork, belonging to the field of precast box girder construction technology. Background Technology

[0002] With the accelerated construction of infrastructure in my country, especially the prefabrication of precast small box girders for highways, this has become a key step restricting rapid on-site construction. How to speed up the prefabrication of box girders, increase the turnover rate of box girder formwork, and reduce construction costs has always been a difficult problem for on-site workers. Traditional precast box girder rebar tying requires laying the bottom formwork first, and then tying the rebar. This occupies a set of formwork in advance, resulting in the formwork being idle during the rebar tying period. Moreover, there is no platform for rebar tying, making the rebar tying more difficult and less economical. Setting up a rebar construction device for rapid turnover of precast box girder formwork is an important step in the rapid turnover of precast box girder formwork and the safe and efficient construction of rebar tying for this type of precast box girder.

[0003] Currently published domestic patents CN217964559U (a rebar cage formwork device) and CN114086769B (an adjustable rebar tying device) cannot solve the problem of rapid formwork turnover during construction operations, nor can they realize the overall rebar tying support. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing method lays the bottom formwork first and then ties the steel bars, which causes the formwork to be idle during the steel bar tying construction period, and the lack of a platform makes steel bar tying more difficult.

[0005] The technical solution adopted by this invention to solve its technical problem is: a steel reinforcement construction device for rapid turnover of precast box girder formwork, comprising several spaced-apart bodies and connecting rods. The body includes a base, columns, telescopic devices, and support rods. The columns are arranged facing each other, with their lower ends hinged to the bases, and the columns can rotate inward. The support rods are spaced-apart on the inner sidewalls of the columns and are arranged facing each other. The upper ends of the columns are connected by telescopic devices, and the columns of adjacent bodies are connected as one unit by connecting rods.

[0006] The telescopic device mentioned above is a jack structure.

[0007] Furthermore, a fixing rod is provided on the inner side of the upper end of the column in the above-mentioned device, and the two ends of the telescopic device are respectively connected to the fixing rods on the corresponding sides.

[0008] The device also includes intermediate rods, which are spaced apart on the inner sidewall of the column and have their ends hinged to the support rods, which can rotate upwards.

[0009] Furthermore, the lower end of the intermediate rod in the above-mentioned device is provided with a reverse rotation stop A that is parallel to the support rod.

[0010] The device also includes a reverse rotation stop block B, which is mounted on the lower side wall of the hinged column. Rotating the column outwards allows the lower end of the reverse rotation stop block B to contact the upper end of the base.

[0011] In the aforementioned device, the connecting rod is detachably connected to the upper end of the column of the adjacent body.

[0012] In the aforementioned device, the upper end of the support rod is a flat plate-like structure.

[0013] Furthermore, the base of the aforementioned device is provided with an opening, the lower end of the column extends into the opening and is hinged to the base, and the lower end of the reverse rotating stop block B contacts the opening end of the base.

[0014] Furthermore, the intermediate rod in the above-mentioned device has a U-shaped cross-section, and one end of the support rod extends into the slot of the intermediate rod and is then hinged to it.

[0015] The beneficial effects of this invention are as follows: This device is widely applicable to the rapid turnover construction of precast box girder formwork. By setting a rotating device for the rebar support, a rotating rebar tying construction device is formed. Rebar tying is performed first without occupying the bottom formwork of the precast box girder. After the rebar tying is completed, the bottom formwork is inserted, the jacks are retracted to position the rebar cage, and the device is removed, completing the installation of the precast box girder side formwork. This avoids the traditional process requiring the installation of the bottom formwork before rebar tying, which occupies one set of formwork and increases the rebar construction cycle. It also provides a safe and reliable construction platform for rebar tying. Furthermore, after the rebar tying of the precast box girder is completed, this device can be quickly used for the rebar tying of the next segment of the precast box girder, reducing the construction difficulty for workers, realizing rapid turnover construction of precast box girder formwork, improving on-site construction safety, and offering high construction efficiency, strong operability, and effective shortening of the construction period. The device can also be reused, saving construction costs. Actual on-site construction testing has shown that the effect fully meets the actual construction needs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure after adjacent bodies of the present invention are connected.

[0018] Figure 3 This is a schematic diagram of the structure of the present invention in actual use.

[0019] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point I.

[0020] The markings in the diagram are as follows: 1 is the base, 2 is the column, 3 is the support rod, 4 is the intermediate rod, 5 is the telescopic device, 6 is the fixing rod, 7 is the box girder precast platform, 8 is the connecting rod, 9 is the reverse rotation stop block B, 10 is the reverse rotation stop block A, 11 is the bottom formwork, 12 is the rebar protective layer pad, and 13 is the rebar. Detailed Implementation

[0021] The invention will be further described below with reference to the accompanying drawings.

[0022] like Figures 1 to 4 As shown, the precast box girder formwork rapid turnover rebar construction device of the present invention includes several spaced-apart bodies and connecting rods 8. Each body includes a base 1, columns 2, telescopic devices 5, and support rods 3. The columns 2 are positioned opposite each other, with their lower ends hinged to the base 1, and the columns 2 can rotate inwards. The support rods 3 are spaced-apart on the inner sidewalls of the columns 2 and are positioned opposite each other. The upper ends of the columns 2 are connected by the telescopic devices 5, and the columns 2 of adjacent bodies are connected as a whole by the connecting rods 8. Those skilled in the art will understand that the spaced-apart bodies of this device, and the connection between adjacent bodies by the connecting rods 8, ensure structural stability during actual use. The bodies include a base 1, columns 2, telescopic devices 5, and support rods 3, with the columns 2 positioned opposite each other, meaning each body has two columns 2 positioned spaced apart and opposite each other, such that the line connecting the two columns 2 is perpendicular to the axis of the connecting rods 8. The lower ends of the columns 2 are hinged to the bases 1, so there are two bases 1. The columns 2 can rotate inwards, meaning they can only rotate inwards towards the other column 2. Support rods 3 are spaced apart on the inner walls of the columns 2. The number of support rods 3 is determined by the structure of the reinforcing cage, and they are arranged opposite each other, meaning the support rods 3 on the inner sides of two opposite columns 2 correspond one-to-one, and the upper surfaces of support rods 3 at the same height should be coplanar. The upper ends of the columns 2 are connected by telescopic devices 5, and the upper ends of the same body are connected by one telescopic device 5. The columns 2 of adjacent bodies are connected as a whole by connecting rods 8. After the main body is assembled along the precast platform 7 of the box girder, the reinforcing bars 13 are placed on the corresponding support rods 3. The reinforcing bars 13 are supported by the support rods 3, and the binding can be carried out simultaneously. After the binding is completed, the bottom formwork 11 is placed at the bottom of the reinforcing cage. The telescopic device 5 is activated to rotate the column 2 inward, so that the reinforcing cage is placed on the reinforcing concrete cover pad 12. The device can be removed to install and fix the side formwork. The device supports the reinforcing bars 13 through the support rods 3 during the binding process. At this time, the bottom formwork 11 is not needed, saving the usage time of the bottom formwork 11, shortening the construction cycle of the reinforcing bars 13, and providing a safe and reliable construction platform for the binding of the reinforcing bars 13.

[0023] Preferably, the telescopic device 5 in the above-mentioned device is a jack structure. Those skilled in the art will understand that, since the telescopic device 5 needs to extend and retract to achieve the rotation of the two columns 2, in order to achieve this extension and retraction, the telescopic device 5 is preferably a hydraulic cylinder structure, and therefore a jack structure is preferred.

[0024] Preferably, in the above-mentioned device, a fixing rod 6 is provided on the inner side of the upper end of the column 2, and the two ends of the telescopic device 5 are respectively connected to the fixing rod 6 on the corresponding side. Those skilled in the art will understand that, in order to facilitate the fixing of the telescopic device 5 to the column 2, this device preferably has a fixing rod 6 provided on the inner side of the upper end of the column 2, and the two ends of the telescopic device 5 are respectively connected to the fixing rod 6 on the corresponding side, facilitating assembly and disassembly.

[0025] Preferably, the above-mentioned device further includes intermediate rods 4, which are spaced apart on the inner wall of the column 2 and hinged at their ends to the support rods 3, and the support rods 3 can rotate upward. Those skilled in the art will understand that, preferably, the support rods 3 are connected to the column 2 via the intermediate rods 4, specifically, the intermediate rods 4 are spaced apart on the inner wall of the column 2 and hinged at their ends to the support rods 3, and the support rods 3 can rotate upward, meaning the support rods 3 can only rotate upward, facilitating the sliding of the reinforcing cage onto the reinforcing cage protective layer pad 12.

[0026] Preferably, the lower end of the intermediate rod 4 in the above-mentioned device is provided with a reverse rotation stop A10, which is parallel to the support rod 3. Those skilled in the art will understand that this structure preferably has a reverse rotation stop A10, which is parallel to the support rod 3, at the lower end of the intermediate rod 4. The reverse rotation stop A10 is mainly provided to ensure that the support rod 3 can only rotate upwards, thus ensuring the stability of the device structure.

[0027] Preferably, the above-mentioned device further includes a reverse rotation stop B9, which is disposed on the lower hinge side wall of the column 2, and rotating the column 2 outward allows the lower end of the reverse rotation stop B9 to contact the upper end of the base 1. Those skilled in the art will understand that, similarly, to prevent the column 2 from rotating outward and affecting the stability of the device, the reverse rotation stop B9 is preferably disposed on the lower hinge side wall of the column 2, and rotating the column 2 outward allows the lower end of the reverse rotation stop B9 to contact the upper end of the base 1, preventing the column 2 from continuing to rotate.

[0028] Preferably, the connecting rod 8 in the above-described device is detachably connected to the upper end of the column 2 of the adjacent body. Those skilled in the art will understand that, for ease of assembly and disassembly, this device preferably has the connecting rod 8 detachably connected to the upper end of the column 2 of the adjacent body. In practice, a bolted connection is preferable.

[0029] Preferably, the upper end of the support rod 3 in the above-described device is a flat plate-like structure. Those skilled in the art will understand that, in order to achieve the positioning and support of the reinforcing bar 13, this device preferably uses a flat plate-like structure at the upper end of the support rod 3 to ensure sufficient support for the reinforcing bar 13.

[0030] Preferably, the base 1 in the above-described device has an opening, the lower end of the column 2 extends into the opening and is hinged to the base 1, and the lower end of the reverse rotation stop B9 can contact the opening end of the base 1. Those skilled in the art will understand that the structure of the base 1 and its connection structure with the column 2 are further preferred in this device. Specifically, the base 1 has an opening, making it a U-shaped structure, the lower end of the column 2 extends into the opening and is hinged to the base 1, and the lower end of the reverse rotation stop B9 can contact the opening end of the base 1 to prevent the column 2 from rotating outwards.

[0031] Preferably, in the above-described device, the intermediate rod 4 has a U-shaped cross-section, and one end of the support rod 3 extends into the slot of the intermediate rod 4 and is hinged thereto. Those skilled in the art will understand that, in order to ensure the supporting strength of the support rod 3, this device preferably has a U-shaped cross-section for the intermediate rod 4, and one end of the support rod 3 extends into the slot of the intermediate rod 4 and is hinged thereto.

[0032] The actual operating method of this device is as follows: 1. Based on the structural characteristics of the precast box girder, design this device (specifically design the height of the column 2, the number and length of the support rods 3, and the telescopic length of the telescopic device 5, etc.).

[0033] 2. Welding to fabricate this device.

[0034] 3. Assemble the device on site to form a rebar binding platform.

[0035] 4. Place the reinforcing bar 13 on the support rod 3 and carry out the reinforcing bar binding construction.

[0036] 5. Lay the bottom formwork 11 of the precast box girder under the steel cage.

[0037] 6. Shrink the jacks to allow the steel cage to sink and be placed on the steel protective layer pad 12.

[0038] 7. Remove the rebar tying device and install the side formwork of the precast box girder.

Claims

1. A reinforcement construction device for rapid turnover of precast box girder formwork, characterized in that: The system includes several spaced-apart bodies and connecting rods (8). The body includes a base (1), a column (2), a telescopic device (5), and a support rod (3). The columns (2) are arranged facing each other, and their lower ends are hinged to the base (1). The columns (2) can rotate inward. The support rods (3) are spaced-apart on the inner sidewall of the columns (2) and are arranged facing each other. The upper ends of the columns (2) are connected by the telescopic device (5), and the columns (2) of adjacent bodies are connected as one unit by the connecting rods (8). The system also includes a reverse rotation stop block B (9), which is located on the lower sidewall of the hinged column (2). Rotating the column (2) outward allows the lower end of the reverse rotation stop block B (9) to contact the upper end of the base (1). The base (1) is provided with an opening. The lower end of the column (2) extends into the opening and is hinged to the base (1). The lower end of the reverse rotation stop block B (9) can contact the opening end of the base (1). It also includes an intermediate rod (4), which is spaced on the inner side wall of the column (2) and its end is hinged to the support rod (3). The support rod (3) can rotate upward. The lower end of the intermediate rod (4) is provided with a reverse rotation stop block A (10) that is parallel to the support rod (3). The connecting rod (8) is detachably connected to the upper end of the column (2) of the adjacent body. The upper end of the support rod (3) is a flat plate structure. After the binding is completed, the bottom mold (11) is placed at the bottom of the steel cage. The telescopic device (5) is activated so that the column (2) rotates inward so that the steel cage is placed on the steel protective layer pad (12).

2. The rebar construction device for rapid turnover of precast box girder formwork according to claim 1, characterized in that: The telescopic device (5) is a jack structure.

3. The rebar construction device for rapid turnover of precast box girder formwork according to claim 2, characterized in that: A fixing rod (6) is provided on the inner side of the upper end of the column (2), and the two ends of the telescopic device (5) are respectively connected to the fixing rod (6) on the corresponding side.

4. The rebar construction device for rapid turnover of precast box girder formwork according to claim 1, characterized in that: The intermediate rod (4) has a U-shaped cross-section, and one end of the support rod (3) extends into the groove of the intermediate rod (4) and is then hinged to it.

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