Prestressed automatic tensioning trolley and tensioning method thereof

Abstract

The present invention belongs to the technical field of bridge construction, and specifically relates to a prestressed automatic tensioning trolley and a tensioning method thereof, comprising a pedestal, a driving wheel being mounted on the pedestal, a control box being mounted on the pedestal, and a tensioning mechanism being mounted on the pedestal; a stabilizing hydraulic rod being mounted on the pedestal, and a fixing plate being mounted on the lower end of the stabilizing hydraulic rod; the present invention has a simple structure, can improve the stability of the trolley during operation, and ensure smooth progress of the tensioning operation.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, in particular to a prestressed automatic tensioning trolley and a tensioning method thereof. Background Art

[0002] Currently, during the construction of bridges, due to the limited length of beams and slabs, the formation of bridges often requires the splicing of multiple beams and slabs. In order to improve the strength and service life of the bridge, negative bending moment tensioning engineering is required at the joints of every two beams and slabs.

[0003] In the existing technology, when performing negative bending moment tensioning on the ends of two beams and slabs, it is generally necessary to first pass the steel strands into the tensioning grooves at the bottom of the two beams and slabs, and then the staff will use the bracket to install the jack on the tensioning grooves at the bottom of the beams and slabs to tension the steel strands.

[0004] At present, when tensioning a bridge, the heavy jacks can be moved by the existing prestressed tensioning trolley, and the position of the jacks can be adjusted relatively flexibly to facilitate the tensioning operation. However, the existing prestressed tensioning trolley is relatively simple, and due to its relatively large overall volume, its stability during operation after movement needs to be further improved to avoid the movement of the trolley during the tensioning operation affecting the normal progress of the tensioning or threatening the personal safety of the workers. Summary of the Invention

[0005] In order to make up for the deficiencies of the prior art, improve the stability of the trolley during operation, and ensure smooth tensioning operations, the present invention proposes a prestressed automatic tensioning trolley and a tensioning method thereof.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: the prestressed automatic tensioning trolley described in the present invention includes a pedestal, a mounting plate is mounted on the pedestal via a connecting column, a power assembly and a hydraulic assembly are mounted on the mounting plate, a driving wheel is mounted on the pedestal, the driving wheel is driven by the power assembly, a control box is mounted on the pedestal, a tensioning mechanism is mounted on the pedestal, the tensioning mechanism includes a mounting frame, the mounting frame is mounted on the right end of the pedestal, a vertical rod is mounted on the mounting frame, a horizontal rail is rotatably mounted on the lower end of the vertical rod, a slider is slidably mounted on the horizontal rail, and a tensioning jack is rotatably mounted on the slider;

[0007] A stabilizing hydraulic rod is installed on the supporting platform, and a fixing plate is installed on the lower end of the stabilizing hydraulic rod.

[0008] Preferably, a balancing bag is installed on the fixed plate, and the balancing bag is filled with hydraulic oil. A contact plate is installed at one end of the balancing bag away from the fixed plate, and a protrusion is provided on the surface of the contact plate.

[0009] Preferably, a through hole is provided on the fixed plate, and a limiting rod is slidably installed in the through hole. The lower end of the limiting rod contacts the side of the contact plate close to the fixed plate. The limiting rod and the contact plate are connected to each other through a ball pair, and the limiting rod is distributed around the circumference of the balance bag.

[0010] Preferably, the contact plate is magnetic and has a magnetic attraction force on the limiting rod.

[0011] Preferably, a transversely arranged connecting rod is installed at the lower end of the stabilizing hydraulic rod, a pressure rod is installed at one end of the connecting rod away from the stabilizing hydraulic rod, the lower end of the pressure rod is connected to a clamping rod through an elastic block, and an inclined surface is provided on the end where the pressure rod and the clamping rod are connected to each other, and the inclined surface is located on the side of the pressure rod and the clamping rod facing the driving wheel.

[0012] Preferably, an inclined block is provided on the side of the clamping rod away from the driving wheel.

[0013] Preferably, a positioning pin is installed on the inclined surface of the pressure rod, and a through groove is opened on the inclined surface of the clamping rod, and the through groove and the positioning pin correspond to each other.

[0014] A tensioning method for a prestressed automatic tensioning trolley, the tensioning method being applicable to any of the above-mentioned prestressed automatic tensioning trolleys, the tensioning method comprising the following steps:

[0015] S1: The staff moves the trolley to the position to be tensioned, and then controls the stabilizing hydraulic rod to extend downward to position and fix the trolley;

[0016] S2: The staff controls the vertical rod to move downward so that the tensioning jack reaches the tensioning position. Then, the position of the slider and the tensioning jack is adjusted so that the tensioning jack is aligned with the hole where the prestressed cable is located.

[0017] S3: Insert the prestressed cable into the tensioning jack and secure it fully, then start the tensioning operation using the tensioning jack.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The prestressed automatic tensioning trolley and tensioning method thereof described in the present invention, by providing a stabilizing hydraulic rod, a fixing plate, a balancing bag and a contact plate, can position and fix the trolley when it is in use, to avoid the movement of the trolley and affecting the normal tensioning. At the same time, the balancing bag and the contact plate are combined with each other, and can adapt to different ground conditions, to avoid movement between the contact plate and the ground, thereby fully positioning and fixing the trolley.

[0020] 2. The prestressed automatic tensioning trolley and tensioning method thereof described in the present invention, by setting a pressure rod, a clamping rod and a positioning pin, inserting the clamping rod between the driving wheel and the ground and fixing the pressure rod with the positioning pin, can further position and fix the trolley, and share the force acting on the stabilizing hydraulic rod when the trolley has a tendency to move, thereby ensuring the relative stability of the trolley. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 It is a front view of the trolley of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the stabilizing hydraulic rod in the trolley of the present invention;

[0024] Figure 3 This is a schematic structural diagram of the trolley's pressure rod and the clamping rod when they are working;

[0025] Figure 4 yes Figure 2 A partial enlarged view of the middle part;

[0026] Figure 5 It is a diagram of the method steps of the present invention;

[0027] In the figure: base 1, mounting plate 11, power assembly 12, hydraulic assembly 13, control box 14, drive wheel 15, mounting frame 2, vertical rod 21, horizontal rail 22, slider 23, tensioning jack 24, stabilizing hydraulic rod 3, fixing plate 31, balancing bag 32, contact plate 33, protrusion 331, limiting rod 34, connecting rod 4, pressure rod 41, elastic block 411, positioning pin 412, clamping rod 42, oblique block 421, through groove 422. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0029] like Figures 1 to 5As shown, the prestressed automatic tensioning trolley of the present invention includes a pedestal 1, a mounting plate 11 is installed on the pedestal 1 through a connecting column, a power assembly 12 and a hydraulic assembly 13 are installed on the mounting plate 11, a driving wheel 15 is installed on the pedestal 1, and the driving wheel 15 is driven by the power assembly 12, a control box 14 is installed on the pedestal 1, a tensioning mechanism is installed on the pedestal 1, and the tensioning mechanism includes a mounting frame 2, the mounting frame 2 is installed on the right end of the pedestal 1, a vertical rod 21 is installed on the mounting frame 2, a horizontal rail 22 is rotatably installed at the lower end of the vertical rod 21, a slider 23 is slidably installed on the horizontal rail 22, and a tensioning jack 24 is rotatably installed on the slider 23;

[0030] A stabilizing hydraulic rod 3 is installed on the platform 1, and a fixing plate 31 is installed at the lower end of the stabilizing hydraulic rod 3;

[0031] When using the trolley to tension the bridge, the staff drives the driving wheel 15 to move through the power assembly 12 on the trolley, so that the trolley moves to the working position. Afterwards, the hydraulic assembly 13 is controlled by the control box 14, so that the hydraulic assembly 13 drives the vertical rod 21 to extend and retract, and through the action of the slider 23 and the cross rail 22, the tensioning jack 24 at the lower end of the vertical rod 21 moves to the designated position to start the tensioning operation. At the same time, after the trolley moves to the working position, the staff drives the hydraulic assembly 13 of the control box 14 to drive the stabilizing hydraulic rod 3, so that the lower end of the stabilizing hydraulic rod 3 extends downward, so that the fixing plate 31 contacts and abuts the ground, thereby using the friction between the fixing plate 31 and the ground to position and fix the trolley, avoiding the trolley from moving during work, affecting the normal progress of tensioning and threatening the personal safety of on-site staff. At the same time, since the lower end of the stabilizing hydraulic rod 3 extends downward, the fixing plate 31 fully contacts and squeezes the ground, which can prevent the fixing plate 31 from sliding between the ground.

[0032] As an embodiment of the present invention, a balancing bag 32 is installed on the fixed plate 31, and the balancing bag 32 is filled with hydraulic oil. A contact plate 33 is installed on the end of the balancing bag 32 away from the fixed plate 31, and a protrusion 331 is provided on the surface of the contact plate 33;

[0033] When tensioning a bridge, the ground where the trolley is located cannot be completely flat. Through the balancing bag 32 set on the fixed plate 31, when the contact plate 33 contacts the ground, the uneven ground will cause the contact plate 33 to tilt to a certain extent, ensuring sufficient contact between the contact plate 33 and the ground, avoiding slippage between the contact plate 33 and the ground, resulting in the trolley not being fully positioned and fixed, causing the trolley to move during work, affecting the normal progress of tensioning and the personal safety of on-site workers. At the same time, by setting the protrusion 331 on the surface of the contact plate 33, the friction between the contact plate 33 and the ground can be further increased, avoiding slippage between the contact plate 33 and the ground, affecting the positioning and fixing effect of the trolley.

[0034] As one embodiment of the present invention, a through hole is formed on the fixing plate 31, and a limit rod 34 is slidably installed in the through hole. The lower end of the limit rod 34 contacts the side of the contact plate 33 near the fixing plate 31. The limit rod 34 and the contact plate 33 are connected to each other via a ball joint. The limit rods 34 are distributed around the circumference of the balancing capsule 32.

[0035] Since the limit rod 34 is slidably installed in the through hole, when the contact plate 33 contacts the ground and causes the contact plate 33 to move up and down or tilt, the limit rod 34 at the corresponding position on the contact plate 33 will move to avoid affecting the movement of the contact plate 33 and ensuring sufficient contact between the contact plate 33 and the ground. At the same time, the limit rod 34 distributed around the balancing capsule 32 will have a certain limiting effect on the balancing capsule 32, avoiding that when the balancing capsule 32 is deformed by the force, the deformation of the balancing capsule 32 is too large, resulting in the balancing capsule 32 bursting or the contact plate 33 directly abutting against the fixed plate 31, affecting the normal movement of the contact plate 33. The balancing bag 32 is restored to its original state after the stabilizing hydraulic rod 32 is retracted, and the limit rod 34 moves downward with the movement of the contact plate 33, thereby ensuring that the lower end of the limit rod 34 is in contact with the contact plate 33.

[0036] As an embodiment of the present invention, the contact plate 33 is magnetic, and the contact plate 33 has a magnetic attraction force on the limiting rod 34;

[0037] Due to the magnetic attraction between the contact plate 33 and the limit rod 34, the limit rod 34 will always maintain contact with the contact plate 33 during use, avoiding the influence of dust and other impurities entering the through hole during use, causing the limit rod 34 to get stuck in the through hole, causing the limit rod 34 and the contact plate 33 to separate from each other, affecting the limit rod 34's restriction and protection effect on the balance bag 32.

[0038] As an embodiment of the present invention, a transversely arranged connecting rod 4 is installed at the lower end of the stabilizing hydraulic rod 3, and a pressure rod 41 is installed at one end of the connecting rod 4 away from the stabilizing hydraulic rod 3. The lower end of the pressure rod 41 is connected to a clamping rod 42 via an elastic block 411. An inclined surface is provided on the end where the pressure rod 41 and the clamping rod 42 are connected to each other. The inclined surface is located on the side of the pressure rod 41 and the clamping rod 42 facing the drive wheel 15.

[0039] When the lower end of the stabilizing hydraulic rod 3 moves downward, the connecting rod 4 installed on the stabilizing hydraulic rod 3 will drive the pressure rod 41 and the clamping rod 42 to move downward synchronously. When the lower end of the clamping rod 42 touches the ground, since the pressure rod 41 and the clamping rod 42 are connected to each other through the elastic block 411, the pressure rod 41 and the clamping rod 42 can rotate around the elastic block 411 to a certain extent. As a result, when the lower end of the stabilizing hydraulic rod 3 continues to descend, the clamping rod 42 rotates relative to the pressure rod 41. When the lower end of the stabilizing hydraulic rod 3 is completely lowered and the fixing plate is When the trolley 31 contacts the ground, the pressure rod 41 and the clamping rod 42 will rotate to a mutually perpendicular angle. At the same time, since the inclined surfaces on the pressure rod 41 and the clamping rod 42 are located on the side facing the driving wheel 15, the clamping rod 42 will be inserted into the position between the driving wheel 15 and the ground after rotation, thereby using the clamping rod 42 to limit the driving wheel 15, further preventing the trolley from moving during use, sharing the force acting on the stabilizing hydraulic rod 3 when the trolley has a tendency to move, improving the effect of positioning and fixing the trolley, and ensuring normal tensioning.

[0040] As an embodiment of the present invention, an inclined block 421 is provided on the side of the clamping rod 42 away from the driving wheel 15;

[0041] When the lever 42 contacts the ground and restricts the drive wheel 15 , the inclined block 421 on the lever 42 will contact the ground, thereby increasing the friction between the lever 42 and the ground, preventing the lever 42 from sliding between the ground and affecting the restricting effect of the lever 42 on the drive wheel 15 .

[0042] As an embodiment of the present invention, a positioning pin 412 is installed on the inclined surface of the pressure rod 41, and a through slot 422 is opened on the inclined surface of the clamping rod 42, and the through slot 422 corresponds to the positioning pin 412;

[0043] When the clamping rod 42 contacts the ground and rotates around the position of the elastic block 411, the positioning pin 412 located on the inclined surface of the pressure rod 41 will enter the through groove 422 as the clamping rod 42 rotates, and when the clamping rod 42 and the pressure rod 41 are perpendicular to each other, the lower end of the positioning pin 412 protrudes out of the through groove 422 on the clamping rod 42. At the same time, after the positioning pin 412 protrudes out of the through groove 422, the positioning pin 412 will penetrate into the ground, further positioning and restricting the trolley to prevent the trolley from moving during work. At the same time, through the positioning pin 412, the pressure rod 41 and the connecting rod 4, the stabilizing hydraulic rod 3 is in contact and positioned with the ground again, thereby ensuring the positioning and fixing effect of the stabilizing hydraulic rod 3 on the trolley.

[0044] A tensioning method for a prestressed automatic tensioning trolley, the tensioning method being applicable to any of the above-mentioned prestressed automatic tensioning trolleys, the tensioning method comprising the following steps:

[0045] S1: The staff controls the trolley to move to the position to be tensioned, and then controls the stabilizing hydraulic rod 3 to extend downward to position and fix the trolley;

[0046] S2: The staff controls the vertical rod 21 to move downward so that the tensioning jack 24 reaches the tensioning position, and then adjusts the position of the slider 23 and the tensioning jack 24 so that the tensioning jack 24 is aligned with the hole where the prestressed cable is located;

[0047] S3: Insert the prestressed cable into the tensioning jack 24 and fully fix it, and start the tensioning operation using the tensioning jack 24.

[0048] The specific workflow is as follows:

[0049] When using a trolley to tension a bridge, the worker drives the driving wheel 15 through the power assembly 12 on the trolley, thereby moving the trolley to the working position. Afterwards, the hydraulic assembly 13 is controlled by the control box 14, so that the hydraulic assembly 13 drives the vertical rod 21 to extend and retract, and through the action of the slider 23 and the cross rail 22, the tensioning jack 24 at the lower end of the vertical rod 21 moves to the designated position to start the tensioning operation. At the same time, after the trolley moves to the working position, the worker drives the stabilizing hydraulic rod 3 through the hydraulic assembly 13 of the control box 14, so that the lower end of the stabilizing hydraulic rod 3 extends downward, so that the fixing plate 31 contacts and abuts the ground, thereby using the friction between the fixing plate 31 and the ground to position and fix the trolley.

[0050] The balancing bag 32 provided on the fixing plate 31 ensures that when the contact plate 33 contacts the ground, the uneven ground will cause the contact plate 33 to tilt to a certain extent, thereby ensuring sufficient contact between the contact plate 33 and the ground.

[0051] Since the limiting rod 34 is slidably installed in the through hole, when the contact plate 33 contacts the ground and causes the contact plate 33 to move up and down or tilt, the limiting rod 34 at the corresponding position on the contact plate 33 will move. At the same time, the limiting rod 34 distributed around the balancing capsule 32 will have a certain limiting effect on the balancing capsule 32, preventing the balancing capsule 32 from deforming too much when it is deformed by the force, causing the balancing capsule 32 to burst or the contact plate 33 to directly abut against the fixed plate 31. At the same time, since the contact plate 33 and the limiting rod 34 are The lower ends of the rods 34 are in contact and the two are connected to each other through a ball joint. Therefore, when the contact plate 33 moves up and down or tilts, the contact plate 33 and the limiting rod 34 can rotate or move relative to each other normally. At the same time, after the tensioning is completed, when the stabilizing hydraulic rod 3 is retracted upward, the contact plate 33 leaves the ground and the balancing bag 32 returns to its original state. At the same time, under the action of gravity, the limiting rod 34 moves downward with the movement of the contact plate 33, ensuring that the lower end of the limiting rod 34 and the contact plate 33 are in contact with each other.

[0052] Since the contact plate 33 has a magnetic attraction to the limiting rod 34, the limiting rod 34 always maintains contact with the contact plate 33 during use, thereby preventing the limiting rod 34 from being affected by dust or other impurities that enter the through hole during use, causing the limiting rod 34 to become stuck in the through hole and causing the limiting rod 34 and the contact plate 33 to separate from each other.

[0053] When the lower end of the stabilizing hydraulic rod 3 moves downward, the connecting rod 4 installed on the stabilizing hydraulic rod 3 will drive the pressure rod 41 and the clamping rod 42 to move downward synchronously. When the lower end of the clamping rod 42 contacts the ground, the pressure rod 41 and the clamping rod 42 are connected to each other by the elastic block 411, so that the pressure rod 41 and the clamping rod 42 can rotate to a certain extent around the elastic block 411, so that when the lower end of the stabilizing hydraulic rod 3 continues to descend, the clamping rod 42 rotates relative to the pressure rod 41. When the lower end of the stabilizing hydraulic rod 3 is completely lowered and the fixing plate 31 contacts the ground, the pressure rod 41 and the clamping rod 42 will rotate to a perpendicular angle to each other. At the same time, since the inclined surfaces on the pressure rod 41 and the clamping rod 42 are located on the side facing the driving wheel 15, the clamping rod 42 will be inserted into the position between the driving wheel 15 and the ground after rotation, so that the driving wheel 15 is limited by the clamping rod 42.

[0054] When the clamping rod 42 contacts the ground and restricts the driving wheel 15, the inclined block 421 on the clamping rod 42 contacts the ground, thereby increasing the friction between the clamping rod 42 and the ground, thereby preventing the clamping rod 42 from sliding against the ground.

[0055] When the clamping rod 42 contacts the ground and rotates around the position of the elastic block 411, the positioning pin 412 on the inclined surface of the pressure rod 41 will enter the through slot 422 as the clamping rod 42 rotates. When the clamping rod 42 and the pressure rod 41 are perpendicular to each other, the lower end of the positioning pin 412 protrudes out of the through slot 422 on the clamping rod 42. At the same time, after the positioning pin 412 protrudes out of the through slot 422, the positioning pin 412 will penetrate into the ground, further positioning and restricting the trolley.

[0056] A tensioning method for a prestressed automatic tensioning trolley, the tensioning method being applicable to any of the above-mentioned prestressed automatic tensioning trolleys, the tensioning method comprising the following steps:

[0057] S1: The staff controls the trolley to move to the position to be tensioned, and then controls the stabilizing hydraulic rod 3 to extend downward to position and fix the trolley;

[0058] S2: The staff controls the vertical rod 21 to move downward so that the tensioning jack 24 reaches the tensioning position, and then adjusts the position of the slider 23 and the tensioning jack 24 so that the tensioning jack 24 is aligned with the hole where the prestressed cable is located;

[0059] S3: Insert the prestressed cable into the tensioning jack 24 and fully fix it, and start the tensioning operation using the tensioning jack 24.

[0060] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A prestressed automatic tensioning trolley, comprising a support (1), a driving wheel (15) mounted on the support (1), a control box (14) mounted on the support (1), and a tensioning mechanism mounted on the support (1); Its characteristics are: A stabilizing hydraulic rod (3) is installed on the support platform (1), and a fixing plate (31) is installed at the lower end of the stabilizing hydraulic rod (3); the tensioning mechanism comprises a mounting frame (2), the mounting frame (2) is installed at the right end of the support platform (1), a vertical rod (21) is installed on the mounting frame (2), a horizontal rail (22) is rotatably installed at the lower end of the vertical rod (21), a slider (23) is slidably installed on the horizontal rail (22), and a tensioning jack (24) is rotatably installed on the slider (23); A connecting rod (4) is installed at the lower end of the stabilizing hydraulic rod (3); a pressure rod (41) is installed at one end of the connecting rod (4) away from the stabilizing hydraulic rod (3); the lower end of the pressure rod (41) is connected to a clamping rod (42) via an elastic block (411); an inclined surface is provided on one end where the pressure rod (41) and the clamping rod (42) are connected to each other; the inclined surface is located on the side of the pressure rod (41) and the clamping rod (42) facing the driving wheel (15); An inclined block (421) is provided on the side of the clamping rod (42) away from the driving wheel (15); A balancing bag (32) is installed on the fixed plate (31), and the balancing bag (32) is filled with hydraulic oil. A contact plate (33) is installed at one end of the balancing bag (32) away from the fixed plate (31), and a protrusion (331) is provided on the surface of the contact plate (33).

2. The prestressed automatic tensioning trolley according to claim 1, characterized in that: A through hole is provided on the fixing plate (31), a limiting rod (34) is slidably installed in the through hole, the limiting rod (34) and the contact plate (33) are connected to each other through a ball pair, and the limiting rod (34) is distributed around the circumference of the balance bag (32).

3. The prestressed automatic tensioning trolley according to claim 2, characterized in that: The contact plate (33) is magnetic, and the contact plate (33) has a magnetic attraction force on the limiting rod (34).

4. The prestressed automatic tensioning trolley according to claim 1, characterized in that: A positioning pin (412) is installed on the inclined surface of the pressure rod (41), and a through slot (422) is opened on the inclined surface of the clamping rod (42), and the through slot (422) and the positioning pin (412) correspond to each other.

5. A method for tensioning a prestressed automatic tensioning trolley, characterized in that: The tensioning method is applicable to a prestressed automatic tensioning trolley according to any one of claims 1 to 4 above, and the tensioning method comprises the following steps: S1: The staff controls the trolley to move to the position to be tensioned, and then controls the stabilizing hydraulic rod (3) to extend downward to position and fix the trolley; S2: The staff controls the vertical rod (21) to move downward so that the tensioning jack (24) reaches the tensioning position, and then adjusts the position of the slider (23) and the tensioning jack (24) so ​​that the tensioning jack (24) is aligned with the hole where the prestressed cable is located; S3: Insert the prestressed cable into the tensioning jack (24) and fully fix it, and start the tensioning operation using the tensioning jack (24).

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