Movable prestress tensioning mechanism for cast-in-place box girder

Abstract

The utility model discloses a movable prestress tensioning mechanism for a cast-in-place box girder, which belongs to the technical field of bridge construction, and is characterized by comprising a moving vehicle, a placing frame is bolted at the top of the moving vehicle, a counterweight mechanism is clamped on the surface of the placing frame, a cantilever frame is arranged at the top of the moving vehicle, and the cantilever frame is connected with the placing frame. An electric hoist is arranged at the bottom of the cantilever frame, and the problems that when existing prestress tensioning equipment is used for cast-in-place box girder construction, balance weights are difficult to adjust flexibly and accurately, so that when the equipment works, due to the fact that the balance weights are not reasonable, the center of gravity shifts easily, stability is poor, and construction efficiency is high are solved. The problems that in the prior art, a structure for effectively preventing a mobile vehicle from rolling over is not provided, in the construction process, the mobile vehicle is prone to rolling over due to factors such as uneven ground and external force collision, equipment is damaged, the construction progress is seriously affected, and large losses and risks are brought to engineering are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction technical field, especially in situ cast box girder movable prestressed tension mechanism. BACKGROUND

[0002] The in situ cast box girder movable prestressed tension mechanism is a professional equipment applied to the in situ cast box girder construction, the in situ cast box girder is the box type bridge structure directly casted on site, and the prestressed tension is the key construction technology for applying the prestress to the concrete structure, and the movable prestressed tension mechanism is a movable device designed for efficiently and accurately completing the prestressed tension process.

[0003] In the process that the mobile tensioning jack tension the prestressed reinforcement in different positions, the jack is heavy, which leads to time-consuming and laborious during transportation, and there is the defect that it is inconvenient to operate when tensioning the prestressed reinforcement in the in situ cast box girder.

[0004] The existing patent (publication number: CN219386020U) discloses an in situ cast box girder movable tensioning device, which comprises a trolley, a supporting mechanism and a tensioning jack, the supporting mechanism is arranged on the trolley, and the tensioning jack is connected to the supporting mechanism, and the application has the effect of improving the operation convenience of the staff when tensioning the prestressed reinforcement of the in situ cast box girder.

[0005] In view of the above problems, the existing patent provides a solution, and the existing prestressed tension equipment is difficult to flexibly and accurately adjust the counterweight when performing in situ cast box girder construction, which leads to the center of gravity of the equipment to deviate due to unreasonable counterweight when working, poor stability, and thus affects the accuracy and safety of tensioning operation, and lacks effective structure to prevent the mobile vehicle from rolling over, and the mobile vehicle is prone to rolling over due to uneven ground, external force collision and other factors during construction, which not only damages the equipment, but also seriously affects the construction progress, causing great loss and risk to the project.

[0006] Therefore, the in situ cast box girder movable prestressed tension mechanism is provided. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing the in situ cast box girder movable prestressed tension mechanism, which can solve the problem that the existing prestressed tension equipment is difficult to flexibly and accurately adjust the counterweight when performing in situ cast box girder construction, which leads to the center of gravity of the equipment to deviate due to unreasonable counterweight when working, poor stability, and thus affects the accuracy and safety of tensioning operation, and lacks effective structure to prevent the mobile vehicle from rolling over, and the mobile vehicle is prone to rolling over due to uneven ground, external force collision and other factors during construction, which not only damages the equipment, but also seriously affects the construction progress, causing great loss and risk to the project.

[0008] In order to achieve the above object, the utility model provides the following technical scheme: Cast-in-place box girder movable prestress tensioning mechanism, including mobile car, the top of mobile car is pegged with placing rack, the surface of placing rack is connected with counterweight mechanism, the top of mobile car is provided with cantilevered frame, the bottom of cantilevered frame is provided with electric hoist, the bottom of electric hoist is provided with tensioning jack, the top of mobile car is provided with support arm, the inner wall of support arm is connected with support mechanism with thread,

[0009] The counterweight mechanism includes a pull ring, a pull rod and a counterweight block, the top of the counterweight block is pegged with the bottom of the pull rod, the inner wall of the pull rod is pegged with the surface of the pull ring, and the inner wall of the counterweight block is connected with the surface of the placing rack.

[0010] Preferably, the top of the mobile car is pegged with a limiting rack, and the surface of the support arm is slidingly connected with the inner wall of the limiting rack.

[0011] Preferably, the inner wall of the limiting rack is threadedly connected with a knob, and the bottom of the knob is in close contact with the top of the support arm.

[0012] Preferably, the inner wall of the limiting rack is provided with a movable groove matched with the support arm, and the inner wall of the limiting rack is provided with a first threaded hole matched with the knob.

[0013] Preferably, the support mechanism includes a rotating plate, a threaded rod and a bottom plate, the top of the bottom plate is pegged with the top of the threaded rod, the top of the threaded rod is pegged with the bottom of the rotating plate, and the surface of the threaded rod is threadedly connected with the inner wall of the support arm.

[0014] Preferably, the top of the rotating plate is pegged with a rotating rod, and the top of the support arm is pegged with an anti-falling positioning block.

[0015] Preferably, the placing rack includes a mounting rack and a connecting block, one side of the connecting block close to the mounting rack is pegged with the mounting rack, the bottom of the mounting rack is pegged with the top of the mobile car, and the inner wall of the counterweight block is connected with the surface of the connecting block.

[0016] Preferably, the inner wall of the counterweight block is provided with a clamping groove, and the inner wall of the support arm is provided with a second threaded hole matched with the threaded rod.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1. The application sets up counterweight mechanism, counterweight mechanism is composed of pull ring, pull rod and counterweight block, counterweight block can be clamped on the surface of placing rack, can conveniently increase or decrease counterweight block to accurately adjust counterweight during work, balance overturning moment of cantilevered frame end according to moment balance principle, ensure that the center of gravity of mobile car is stable, provide stable platform for prestressed tension, guarantee construction safety and quality;

[0019] 2. The application sets up supporting mechanism, through the threaded connection mode of supporting arm and supporting mechanism, installation and adjustment are convenient, can effectively prevent mobile car from rolling over during work, enhance construction stability, can resist external force in complex environment, provide reliable support for prestressed tension operation, improve construction efficiency and safety. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall structural diagram of the cast-in-place box girder movable prestressed tension mechanism of the utility model;

[0021] Figure 2 It is the structure diagram of the mobile car of the utility model;

[0022] Figure 3 It is the structure diagram of the electric hoist of the utility model;

[0023] Figure 4 It is the structure diagram of the placing rack of the utility model;

[0024] Figure 5 It is the structure diagram of the counterweight mechanism of the utility model;

[0025] Figure 6 It is the structure diagram of the supporting mechanism of the utility model.

[0026] In the drawing, 1, mobile car;2, counterweight mechanism;201, pull ring;202, pull rod;203, counterweight block;3, placing rack;301, mounting rack;302, connecting block;4, supporting mechanism;401, rotating plate;402, threaded rod;403, bottom plate;5, second threaded hole;6, cantilevered frame;7, electric hoist;8, tension jack;9, supporting arm;10, limiting frame;11, knob;12, movable slot;13, first threaded hole;14, rotating rod;15, anti-falling positioning block;16, clamping groove. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0028] Please refer to Figures 1-6 The utility model provides technical schemes:

[0029] The cast-in-place box girder movable prestress tensioning mechanism, including mobile car 1, the top of mobile car 1 is tied with placing rack 3, the surface of placing rack 3 is connected with counterweight mechanism 2, the top of mobile car 1 is provided with cantilevered frame 6, the bottom of cantilevered frame 6 is provided with electric hoist 7, the bottom of electric hoist 7 is provided with tensioning jack 8, the top of mobile car 1 is provided with support arm 9, the inner wall of support arm 9 is connected with support mechanism 4 by screw thread.

[0030] Counterweight mechanism 2 includes pull ring 201, pull rod 202 and counterweight block 203, the top of counterweight block 203 is tied with the bottom of pull rod 202, the inner wall of pull rod 202 is tied with the surface of pull ring 201, the inner wall of counterweight block 203 is connected with the surface of placing rack 3.

[0031] In the embodiment: by setting counterweight mechanism 2, counterweight mechanism 2 is composed of pull ring 201, pull rod 202 and counterweight block 203, counterweight block 203 can be stably connected on the surface of placing rack 3, during work, the number of counterweight block 203 can be conveniently increased or decreased through pull ring 201 and pull rod 202, so as to accurately adjust the counterweight, when the one end of cantilevered frame 6 generates downward overturning moment due to electric hoist 7 and tensioning jack 8 and other components, according to the principle of moment balance, counterweight block 203 can be flexibly adjusted, so that the moment generated by the counterweight is balanced with the overturning moment, thereby ensuring the stability of the overall center of gravity of mobile car 1, avoiding the shaking or overturning of mobile car 1 due to the deviation of the center of gravity, providing a stable working platform for prestress tensioning operation, ensuring construction safety, and also being conducive to improving tensioning accuracy and construction quality, ensuring that the prestress tensioning effect of the box girder meets the design requirements, by setting support mechanism 4, through the screw thread connection between support arm 9 and support mechanism 4, installation and adjustment can be conveniently carried out, support mechanism 4 can effectively prevent the side turning of mobile car 1 during work, greatly enhancing the stability of mobile car 1 during construction, especially in complex construction site environment, various external factors can be resisted to affect mobile car 1, reliable support is provided for prestress tensioning operation, and construction efficiency and safety are improved.

[0032] Specifically, as shown in Figure 6 The top of mobile car 1 is tied with limit rack 10, and the surface of support arm 9 is connected with the inner wall of limit rack 10.

[0033] Specifically, as shown in Figure 6 The inner wall of limit rack 10 is connected with knob 11 by screw thread, and the bottom of knob 11 is in close contact with the top of support arm 9.

[0034] Specifically, as shown in Figure 6As shown, the inner wall of the limiting frame 10 is provided with a movable groove 12 matched with the supporting arm 9, and the inner wall of the limiting frame 10 is provided with a first threaded hole 13 matched with the knob 11.

[0035] In this embodiment: by setting the limiting frame 10, the supporting arm 9 is connected in the inner wall of the limiting frame 10, and the knob 11 is threadedly connected with the inner wall of the limiting frame 10 and the bottom is in close contact with the top of the supporting arm 9, and the inner wall of the limiting frame 10 is provided with a movable groove 12 and a first threaded hole 13, which can realize the limiting and fixing of the supporting arm 9. On the one hand, the sliding connection makes the supporting arm 9 more smooth when adjusting and expanding, and the construction personnel can quickly adjust the position of the supporting arm 9 according to the actual situation, on the other hand, the knob 11 can be tightened after the supporting arm 9 is adjusted to the appropriate position, which ensures that the supporting arm 9 will not move left and right during work due to external force and other factors, further enhances the stability of the supporting arm 9, thereby ensuring the stability of the whole mobile vehicle 1, providing more reliable support for prestressed tensioning operation, and improving the safety and efficiency of construction.

[0036] Specifically, as shown in Figure 6 The supporting mechanism 4 includes a rotating plate 401, a threaded rod 402, and a bottom plate 403. The top of the bottom plate 403 is bolted to the top of the threaded rod 402, the top of the threaded rod 402 is bolted to the bottom of the rotating plate 401, and the surface of the threaded rod 402 is threadedly connected with the inner wall of the supporting arm 9.

[0037] Specifically, as shown in Figure 6 The top of the rotating plate 401 is bolted to a rotating rod 14, and the top of the supporting arm 9 is bolted to an anti-falling positioning block 15.

[0038] In this embodiment: the supporting mechanism 4 is composed of a rotating plate 401, a threaded rod 402, and a bottom plate 403. The threaded rod 402 is threadedly connected with the inner wall of the supporting arm 9, the top of the rotating plate 401 is bolted to the rotating rod 14, and the top of the supporting arm 9 is bolted to the anti-falling positioning block 15. The rotating rod 14 is provided to facilitate the rotation of the rotating plate 401, thereby driving the threaded rod 402 to rotate and achieving the lifting of the bottom plate 403. The operation is convenient and labor-saving, and the supporting height of the supporting mechanism 4 can be quickly adjusted to adapt to different construction site conditions. The anti-falling positioning block 15 can effectively prevent the supporting arm 9 from accidentally falling during adjustment, improving the safety and reliability of the operation. The threaded connection of the threaded rod 402 and the supporting arm 9 ensures the stability of the supporting mechanism 4 after adjusting the height, so that it can stably support the mobile vehicle 1 and prevent it from tipping over.

[0039] Specifically, as shown in Figure 4As shown, the placing rack 3 comprises a mounting rack 301 and a connecting block 302, the connecting block 302 is bolted to one side of the mounting rack 301, the bottom of the mounting rack 301 is bolted to the top of the mobile trolley 1, and the inner wall of the counterweight block 203 is clamped to the surface of the connecting block 302.

[0040] Specifically, as shown in Figure 5 、 Figure 6 The inner wall of the counterweight block 203 is provided with a clamping groove 16, and the inner wall of the support arm 9 is provided with a second threaded hole 5 for cooperating with the threaded rod 402.

[0041] In this embodiment: the placing rack 3 is composed of a mounting rack 301 and a connecting block 302, the connecting block 302 is arranged to enable the counterweight block 203 to be clamped more stably on the placing rack 3, avoiding displacement or falling of the counterweight block 203 due to factors such as vibration during construction, ensuring the stability and reliability of the counterweight, and further ensuring the stability of the overall center of gravity of the mobile trolley 1, the clamping groove 16 provided in the inner wall of the counterweight block 203 further enhances the connection strength and stability between the counterweight block 203 and the placing rack 3, and the second threaded hole 5 provided in the inner wall of the support arm 9 provides a precise matching position for the installation and adjustment of the support mechanism 4, ensuring that the support mechanism 4 can work normally and play its role in preventing the mobile trolley 1 from tipping over, creating good conditions for prestressed tensioning operations.

[0042] Working principle: during the use of the mobile trolley 1, by arranging the counterweight mechanism 2, the counterweight mechanism 2 is composed of a pull ring 201, a pull rod 202 and a counterweight block 203, the counterweight block 203 can be stably clamped on the surface of the placing rack 3, during work, the number of counterweight blocks 203 can be conveniently increased or decreased through the pull ring 201 and the pull rod 202, so as to accurately adjust the counterweight, when one end of the cantilever frame 6 generates a downward overturning moment due to components such as the electric hoist 7 and the tensioning jack 8, according to the principle of moment balance, the counterweight block 203 can be flexibly adjusted, so that the moment generated by the counterweight is balanced with the overturning moment, thereby ensuring the stability of the overall center of gravity of the mobile trolley 1, avoiding shaking or even overturning of the mobile trolley 1 due to the shift of the center of gravity, providing a stable working platform for prestressed tensioning operations, ensuring construction safety, and also conducive to improving tensioning precision and construction quality, ensuring that the prestressed tensioning effect of the box girder meets the design requirements, by arranging the support mechanism 4, through the threaded connection between the support arm 9 and the support mechanism 4, the installation and adjustment can be conveniently carried out, the support mechanism 4 can effectively prevent the mobile trolley 1 from tipping over during work, greatly enhancing the stability of the mobile trolley 1 during construction, especially in complex construction site environments, it can resist the influence of various external factors on the mobile trolley 1, providing reliable support for prestressed tensioning operations, improving construction efficiency and safety.

[0043] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A movable prestressed tensioning mechanism for cast-in-place box girder, comprising a moving vehicle (1), characterized in that: The top of the mobile trolley (1) is hinged with a placing rack (3), the surface of the placing rack (3) is clamped with a counterweight mechanism (2), the top of the mobile trolley (1) is provided with a cantilever frame (6), the bottom of the cantilever frame (6) is provided with an electric hoist (7), the bottom of the electric hoist (7) is provided with a tensioning jack (8), and the top of the mobile trolley (1) is provided with a supporting arm (9), and the inner wall of the supporting arm (9) is threadedly connected with a supporting mechanism (4). The counterweight mechanism (2) comprises a pull ring (201), a pull rod (202) and a counterweight block (203), the top of the counterweight block (203) is hinged with the bottom of the pull rod (202), the inner wall of the pull rod (202) is hinged with the surface of the pull ring (201), and the inner wall of the counterweight block (203) is clamped with the surface of the placing rack (3).

2. The movable prestressed tensioning mechanism for cast-in-place box girder according to claim 1, characterized in that: The top of the mobile trolley (1) is hinged with a limiting frame (10), and the surface of the supporting arm (9) is slidably connected with the inner wall of the limiting frame (10).

3. The cast-in-place box girder movable prestress tensioning mechanism according to claim 2, characterized in that: The inner wall of the limiting frame (10) is threadedly connected with a knob (11), and the bottom of the knob (11) is in close contact with the top of the supporting arm (9).

4. The cast-in-place box girder movable prestress tensioning mechanism according to claim 3, characterized in that: The inner wall of the limiting frame (10) is provided with a movable groove (12) matched with the supporting arm (9), and the inner wall of the limiting frame (10) is provided with a first threaded hole (13) matched with the knob (11).

5. The movable prestress tensioning mechanism for cast-in-place box girder according to claim 1, characterized in that: The supporting mechanism (4) comprises a rotating plate (401), a threaded rod (402) and a bottom plate (403), the top of the bottom plate (403) is hinged with the top of the threaded rod (402), the top of the threaded rod (402) is hinged with the bottom of the rotating plate (401), and the surface of the threaded rod (402) is threadedly connected with the inner wall of the supporting arm (9).

6. The cast-in-place box girder movable prestress tensioning mechanism according to claim 5, characterized in that: The top of the rotating plate (401) is hinged with a rotating rod (14), and the top of the supporting arm (9) is hinged with an anti-falling positioning block (15).

7. The cast-in-place box girder movable prestress tensioning mechanism according to claim 1, characterized in that: The placing rack (3) comprises a mounting rack (301) and a connecting block (302), one side of the connecting block (302) close to the mounting rack (301) is hinged with the mounting rack (301), the bottom of the mounting rack (301) is hinged with the top of the mobile trolley (1), and the inner wall of the counterweight block (203) is clamped with the surface of the connecting block (302).

8. The cast-in-place box girder movable prestress tensioning mechanism according to claim 1, characterized in that: The inner wall of the counterweight block (203) is provided with a clamping groove (16), and the inner wall of the supporting arm (9) is provided with a second threaded hole (5) matched with the threaded rod (402).

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