A formwork lifting device between precast beams on a bridge

Abstract

This application relates to the field of bridge technology and provides a formwork hoisting device for precast beams on a bridge, including a template, a hoisting mechanism, a top formwork mechanism, and a frame. The frame is erected between two adjacent precast beams. Both the hoisting mechanism and the top formwork mechanism are mounted on the frame. The hoisting mechanism includes two sets of electric hoists, each detachably connected to both ends of the template. The electric hoists are used to lift the template to the bottom area of ​​the precast beam. The top formwork mechanism is configured as a worm gear screw jack, with the screw of the worm gear screw jack detachably connected to the template. This formwork hoisting device for precast beams on a bridge aims to improve the safety of installing templates between two adjacent precast beams.

Description

Technical Field

[0001] This application relates to the field of bridge technology, and in particular to a lifting formwork device between precast beams on a bridge. Background Technology

[0002] In the construction of precast bridges, the ends of adjacent precast beams need to be connected by cast-in-place wet joints. The pouring of wet joints requires the erection of formwork at the bottom to support the concrete. The current construction method for installing formwork is as follows: during the production stage of precast beams, the bottom bolt sleeves are pre-embedded. During on-site construction, workers need to enter the high-altitude environment under the beams, install the load-bearing I-beams and fix them to the pre-embedded parts, and suspend adjustable hangers to connect the bottom formwork system. By simultaneously tightening the hanger nuts under the beams, the bottom formwork is lifted to be in close contact with the bottom surface of the precast beams. After filling with sealant, the side formwork is installed, finally forming a closed concrete pouring space.

[0003] However, in the above construction methods, construction workers must operate below the precast beams to install hangers, lift formwork, and fasten it. Especially in scenarios involving high piers, crossing rivers, or crossing roads, workers need to be suspended high above the bridge, posing a risk of falling. Therefore, a suspended formwork device that eliminates the need for high-altitude work under the beams is needed. Utility Model Content

[0004] To improve the safety of installing formwork between two adjacent precast beams, this application provides a formwork hoisting device between precast beams on a bridge.

[0005] The present application provides a formwork lifting device for precast beams on a bridge, which adopts the following technical solution: A formwork hoisting device for precast beams on a bridge includes a template, a hoisting mechanism, a top formwork mechanism, and a frame. The frame is erected between two adjacent precast beams. The hoisting mechanism and the top formwork mechanism are both mounted on the frame. The hoisting mechanism includes two sets of electric hoists, which are detachably connected to both ends of the template. The electric hoists are used to lift the template to the bottom area of ​​the precast beam. The top formwork mechanism is a worm gear screw jack, and the screw of the worm gear screw jack is detachably connected to the template.

[0006] By adopting the above technical solution, the hoisting mechanism uses two sets of electric hoists that are detachably connected to both ends of the template, which can easily lift the template from the ship to the bottom area of ​​the precast beam; then, the worm gear screw jack is used to connect its screw to the template, which can make the template abut against the bottom of the precast beam and prevent the template from swaying freely; thus, it is convenient for workers to fill the sealant and install the side formwork, and finally form a closed concrete pouring space.

[0007] This device prevents workers from performing high-altitude operations under the beam, thereby reducing the risk of falls and improving the safety of workers during construction.

[0008] Optionally, one end of the lead screw is equipped with an installation rod, the template has an installation hole for the installation rod to be inserted, and the end of the installation rod passes through the bottom of the template; a positioning rod is slidably installed at the bottom of the template, the template is equipped with a drive assembly for driving the positioning rod to slide, and the installation rod has a positioning hole for the positioning rod to be inserted.

[0009] By adopting the above technical solution, when one end of the screw rod is detachably connected to the template, the screw rod is driven to move vertically so that the mounting rod at one end of the screw rod is inserted into the mounting hole; and when the end of the positioning rod is aligned with the positioning hole, the positioning rod is driven to slide by the driving component so that it is inserted into the positioning hole, thereby realizing the connection between the screw rod and the template, so as to facilitate the pouring operation above it.

[0010] Optionally, a positioning sleeve is provided on the upper surface of the template, and the positioning sleeve is coaxially arranged with the mounting hole; a pre-embedded sleeve is fitted on the outer wall of the positioning sleeve.

[0011] By adopting the above technical solution, and by setting up pre-embedded sleeves and positioning sleeves, when the pouring operation is completed above the formwork, the pre-embedded sleeves will be connected to the concrete; then, when demolding, the screw rod can be disengaged from the pre-embedded sleeve, and the positioning sleeve and pre-embedded sleeve of the formwork can be disconnected, so as to facilitate the reuse of the formwork and top formwork mechanism.

[0012] Optionally, the outer wall of the positioning sleeve is provided with a rubber layer.

[0013] By adopting the above technical solution, the rubber layer can increase or decrease the stability of the pre-embedded sleeve on the outer wall of the alligator positioning sleeve.

[0014] Optionally, the template is provided with a barrier sleeve, which is connected to the template via an electromagnetic component; the barrier sleeve is coaxially arranged with the mounting hole.

[0015] By adopting the above technical solution, the barrier sleeve can isolate the concrete poured above the template from the screw rod, preventing the screw rod from becoming one with the concrete. The barrier sleeve is also compatible with the outer wall of the screw rod, preventing concrete from entering the barrier sleeve during the pouring process. Furthermore, by de-energizing the electromagnetic component, it is convenient to remove the formwork from the concrete.

[0016] Optionally, the drive assembly includes a motor, a rack, and a gear, with the rack fixed to the side wall of the positioning rod; the gear is rotatably mounted on the template and meshes with the rack, and the motor is used to drive the gear to rotate.

[0017] By adopting the above technical solution, the drive assembly consisting of a motor, gears and racks can drive the positioning rod to slide so that the positioning rod can be inserted and engaged with the positioning hole.

[0018] Optionally, the drive assembly is configured as an electric push rod, wherein the drive rod of the electric push rod is connected to the positioning rod.

[0019] By adopting the above technical solution, the electric push rod drives the positioning rod to insert into the positioning hole of the mounting rod, which can effectively realize the connection and fixation of the template and the lead rod.

[0020] Optionally, the bottom of the template is equipped with an installation plate, which has a sliding groove for the positioning rod to slide and a connecting groove for communicating with the installation hole; when the installation rod is inserted into the connecting groove, both ends of the positioning hole are connected to the sliding groove.

[0021] By adopting the above technical solution and setting up an installation plate, the connection strength between the positioning rod and the installation rod can be increased.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The hoisting mechanism uses two sets of electric hoists that are detachably connected to both ends of the formwork, which can easily lift the formwork from the ship to the bottom area of ​​the precast beam. Then, a worm gear screw jack is used to connect its screw to the formwork, which can make the formwork abut against the bottom of the precast beam and prevent the formwork from swaying freely. This avoids workers from working at height under the beam, thereby reducing the risk of falls and improving the safety of workers during construction. 2. By setting up pre-embedded sleeves and positioning sleeves, the pre-embedded sleeves will be connected to the concrete when the pouring operation is completed above the formwork; then, when demolding, the screw rod can be disengaged from the pre-embedded sleeve, and the positioning sleeve and pre-embedded sleeve of the formwork can be disconnected, so as to facilitate the reuse of the formwork and top formwork mechanism. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the frame structure of Example 1; Figure 2 This is a partial cross-sectional view of Embodiment 1; Figure 3 This is a partial cross-sectional view of Embodiment 2; Figure 4 This is a partial cross-sectional view of Example 3.

[0024] Explanation of reference numerals in the attached drawings: 1. Template; 11. Mounting hole; 12. Positioning sleeve; 13. Embedded sleeve; 14. Rubber layer; 15. Mounting plate; 16. Sliding groove; 17. Connecting groove; 18. Positioning rod; 19. Barrier sleeve; 2. Lifting mechanism; 21. Electric hoist; 3. Top mold mechanism; 31. Mounting rod; 32. Positioning hole; 4. Frame; 41. Crossbeam; 42. Support frame; 5. Drive assembly; 51. Motor; 52. Gear; 53. Rack. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] Example 1: This application discloses a formwork hoisting device between precast beams on a bridge.

[0027] Reference Figure 1 and Figure 2 A formwork hoisting device for precast beams on a bridge includes a template 1, a hoisting mechanism 2, a top formwork mechanism 3, and a frame 4. The frame 4 is erected above two adjacent precast beams. The hoisting mechanism 2 and the top formwork mechanism 3 are both installed on the frame 4. The frame 4 includes a crossbeam 41 and two support frames 42. The two support frames 42 are erected above two adjacent precast beams and are spaced apart along the width of the precast beams. The crossbeam 41 is erected above the two adjacent support frames 42 and is detachably connected to the two support frames 42 by bolts to facilitate the rotation of the frame 4.

[0028] Reference Figure 1 The hoisting mechanism 2 includes two sets of electric hoists 21, which are respectively installed at both ends of the crossbeam 41 along its length. Both ends of the template 1 are equipped with hooks, and the electric hoists 21 are used to engage with these hooks. When it is necessary to lift the template 1 to the bottom area of ​​the precast beam, a boat is used to transport the template 1 to the bottom of the precast beam, and then the hooks are engaged with the electric hoists 21 to lift or lower the template 1. Since the electric hoist 21 is existing technology, it will not be described in detail here.

[0029] Reference Figure 2 The top mold mechanism 3 includes a worm gear screw jack, which is mounted on the crossbeam 41. The worm gear screw jack has a screw, and one end of the screw is provided with a mounting rod 31. The mounting rod 31 is made of the same material as the screw. The mounting rod 31 can be integrally formed with the screw or welded to one end of the screw. In this embodiment, the mounting rod 31 is welded to one end of the screw. The worm gear screw jack is prior art and will not be described in detail here. Furthermore, the screw in the worm gear screw can only move linearly in the axial direction and cannot rotate radially.

[0030] Template 1 has a mounting hole 11 for inserting the mounting rod 31. The diameter of the mounting hole 11 is adapted to the mounting rod 31 to ensure that the mounting rod 31 can be inserted smoothly. The end of the mounting rod 31 passes through the bottom of the template 1. A positioning rod 18 is slidably installed at the bottom of the template 1. In this embodiment, the positioning rod 18 is generally cuboid in shape. The mounting rod 31 has a positioning hole 32 for inserting the positioning rod 18. Template 1 is equipped with a drive assembly 5 for driving the positioning rod 18 to slide.

[0031] In this embodiment, a positioning sleeve 12 is provided on the upper surface of the template 1. The positioning sleeve 12 is coaxially arranged with the mounting hole 11. The end of the mounting rod 31 passes through the positioning sleeve 12 and the mounting hole 11 in sequence and enters the bottom of the template 1. A pre-embedded sleeve is fitted on the outer wall of the positioning sleeve 12. The pre-embedded sleeve is made of PVC material, which is lightweight and corrosion resistant.

[0032] When pouring concrete above template 1, the embedded sleeve can isolate the threaded rod from the concrete, making it easier to remove the threaded rod later; and after demolding, pouring concrete into the embedded sleeve can seal it, thus completing the connection of the two precast beams.

[0033] In order to increase the stability of the installation of the positioning sleeve 12 and the pre-embedded sleeve 13, a rubber layer 14 is provided on the outer wall of the positioning sleeve 12 to increase the friction between the positioning sleeve 12 and the pre-embedded sleeve.

[0034] A mounting plate 15 is installed at the bottom of the template 1. The mounting plate 15 is generally a rectangular flat plate, and the material can be carbon steel or aluminum alloy. The mounting plate 15 has a sliding groove 16 for the positioning rod 18 to slide and a connecting groove 17 for communicating with the mounting hole 11. When the mounting rod 31 is inserted into the connecting groove 17, both ends of the positioning rod 18 are connected to the sliding groove 16, so that the positioning rod 18 can be inserted into the positioning hole 32.

[0035] In this embodiment, the drive component 5 is set as an electric push rod, which is installed on the mounting plate 15. The drive rod of the electric push rod is connected to the positioning rod 18. By driving the drive rod to extend and retract, the positioning rod 18 is moved to slide, thereby realizing the positioning of the mounting rod 31.

[0036] The implementation principle of Embodiment 1 of this application is as follows: The hoisting mechanism 2 uses two sets of electric hoists 21 that are detachably connected to both ends of the template 1, which can easily lift the template 1 from the ship to the bottom area of ​​the precast beam. Then, a worm gear screw jack is used to connect its screw to the template 1, and the template 1 is lifted to be in close contact with the bottom surface of the precast beam, which can prevent the template 1 from swaying freely. This makes it easier for workers to fill the sealant and install the side formwork, ultimately forming a closed concrete pouring space.

[0037] The entire process eliminates the need for construction workers to work at heights under the beams, reducing the risk of falls and improving the safety of construction personnel.

[0038] Example 2: This application discloses a formwork hoisting device between precast beams on a bridge.

[0039] Reference Figure 3The difference between Embodiment 2 and Embodiment 1 is that the drive assembly 5 includes a motor 51, a gear 52, and a rack 53. The rack 53 is fixed to one end of the positioning rod 18. The gear 52 is generally made of carbon steel and its surface is hardened to improve its hardness and wear resistance. The gear 52 is rotatably mounted on the mounting plate 15 and meshes with the rack 53. The material can be alloy steel or engineering plastic.

[0040] The motor 51 is mounted on the mounting plate 15 and is used to drive the gear 52 to rotate. The motor 51 drives the gear 52 to rotate, which causes the rack 53 to slide the positioning rod 18, so that the positioning rod 18 is inserted into the positioning hole 32.

[0041] Example 3: This application discloses a formwork hoisting device between precast beams on a bridge.

[0042] Reference Figure 4 The difference between Embodiment 3 and Embodiment 1 is that: a barrier sleeve 19 is provided on the upper surface of the template 1, the barrier sleeve 19 is coaxially arranged with the mounting hole 11, and the inner diameter of the barrier sleeve 19 is adapted to the outer diameter of the lead screw; in this embodiment, the barrier sleeve 19 is connected to the template 1 through an electromagnetic component.

[0043] The electromagnetic assembly includes a permanent magnet and an electromagnetic component. The electromagnetic component is mounted on the template 1, and the permanent magnet is mounted on the end of the barrier sleeve 19. The electromagnetic component interacts with the permanent magnet to generate a constant magnetic field, thereby achieving adsorption and fixation or detachment between the barrier sleeve 19 and the template 1. The specific working principle of the electromagnetic component is within the scope of existing technology and will not be elaborated here.

[0044] When concrete pouring is complete and demolding is required, the barrier sleeve 19 (along with the permanent magnet at its end) can be easily separated from the template 1 by controlling the de-energization of the electromagnetic components. The permanent magnet is left directly at the end of the barrier sleeve 19. Considering that the permanent magnet itself has a simple structure and low cost, this design not only achieves convenient disassembly but also helps control the overall cost of the device.

[0045] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A form-hanging device between precast beams on a bridge, characterized by: The system includes a template (1), a hoisting mechanism (2), a top formwork mechanism (3), and a frame (4). The frame (4) is erected between two adjacent precast beams. The hoisting mechanism (2) and the top formwork mechanism (3) are both installed on the frame (4). The hoisting mechanism (2) includes two sets of electric hoists (21). The two sets of electric hoists (21) are detachably connected to both ends of the template (1). The electric hoists (21) are used to lift the template (1) to the bottom area of ​​the precast beam. The top formwork mechanism (3) is set as a worm gear screw jack. The screw of the worm gear screw jack is detachably connected to the template (1).

2. A form lifting device between precast beams on a bridge according to claim 1, characterized in that: One end of the lead screw is equipped with an installation rod (31), and the template (1) has an installation hole (11) for the installation rod (31) to be inserted. The end of the installation rod (31) passes through the bottom of the template (1). A positioning rod (18) is slidably installed at the bottom of the template (1). The template (1) is equipped with a drive assembly (5) for driving the positioning rod (18) to slide. The installation rod (31) has a positioning hole (32) for the positioning rod (18) to be inserted.

3. The formwork hoisting device between precast beams on a bridge according to claim 2, characterized in that: The outer wall of the lead screw is fitted with a pre-embedded sleeve, and the upper surface of the template (1) is provided with a positioning sleeve (12) for the pre-embedded sleeve to be fitted. The positioning sleeve (12) is coaxially arranged with the mounting hole (11).

4. The formwork lifting device between precast beams on a bridge according to claim 3, characterized in that: The outer wall of the positioning sleeve (12) is provided with a rubber layer (14).

5. A formwork lifting device between precast beams on a bridge according to claim 2, characterized in that: The template (1) is provided with a barrier sleeve, which is connected to the template (1) through an electromagnetic component; the barrier sleeve is coaxially arranged with the mounting hole (11).

6. A formwork lifting device between precast beams on a bridge according to claim 2, characterized in that: The drive assembly (5) includes a motor (51), a rack (53) and a gear (52). The rack (53) is fixed to the positioning rod (18). The gear (52) is rotatably mounted on the template (1) and meshes with the rack (53). The motor (51) is used to drive the gear (52) to rotate.

7. A formwork lifting device between precast beams on a bridge according to claim 2, characterized in that: The drive assembly (5) is configured as an electric push rod, and the drive rod of the electric push rod is connected to the positioning rod (18).

8. A formwork lifting device between precast beams on a bridge according to claim 2, characterized in that: The template (1) is equipped with an installation plate (15) at the bottom. The installation plate (15) has a sliding groove (16) for the positioning rod (18) to slide and a connecting groove (17) for communicating with the installation hole (11). When the installation rod (31) is inserted into the connecting groove (17), both ends of the positioning hole (32) are connected to the sliding groove (16).

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