Tensioning jack in-place device for upper toothed plate in large-span continuous box girder

Abstract

The utility model provides a tensioning jack in-place device for an upper toothed plate in a large-span continuous box girder, which comprises a support frame, a travel frame is detachably arranged on the support frame, and the bottom of the support frame is detachably connected with a pier body; the moving frame is slidably arranged in the supporting frame through a driving device; the lifting device comprises four groups of directional wheels respectively arranged at four corners of the bottom side of the movable frame and a wire twisting roller arranged on the movable frame through a driving part, four steel cables are arranged on the wire twisting roller, and each steel cable passes through the corresponding directional wheel and is perpendicular to the horizontal plane; the four corners of the bracket are fixedly connected with the ends, away from the movable frame, of the four steel cables correspondingly; the supporting frame is detachably connected with the stroke frame and the bracket, before use, the supporting frame is disassembled and then carried into a box girder from a reserved opening, then assembling is carried out, the bottom of the supporting frame is fixed to a pier body of a prestressed steel strand needing to be anchored, and then the wire twisting roller is driven by the driving piece to rotate to recycle a steel cable. And anchoring prestress work can be carried out.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a device for positioning tension jacks on the inner upper tooth plate of a large-span continuous box girder. Background Technology

[0002] In bridge engineering, especially in the construction of long-span continuous box girders, tensioning jacks are important equipment used for prestressing steel strands.

[0003] However, during the tensioning of the upper toothed plate, because the continuous box girder has already been closed, the reserved opening inside the box girder is small, restricting the access of lifting equipment and making the positioning and movement of jacks extremely difficult. Traditional methods for positioning jacks inside the box girder often require multiple people working together, manually moving and installing them, which is not only inefficient but also poses safety hazards. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a device for positioning tension jacks on the upper toothed plate inside a large-span continuous box girder. This device solves the problem that existing methods for positioning jacks inside box girders often require multiple people to work together and involve risks associated with manual handling and installation.

[0005] According to an embodiment of this utility model, a positioning device for a tensioning jack on the upper toothed plate of a large-span continuous box girder includes a support frame on which a travel frame is detachably mounted, and the bottom of the support frame is detachably connected to the pier body; a movable frame, which is slidably mounted inside the support frame via a drive device; a lifting device, including four sets of directional wheels respectively mounted at the four corners of the bottom side of the movable frame, and a stranded roller mounted on the movable frame via a drive component, wherein four steel cables are mounted on the stranded roller, each steel cable passing through a corresponding directional wheel and perpendicular to the horizontal plane, and the drive component is used to drive the stranded roller to rotate; and a bracket, which is fixedly connected at the four corners to the ends of the four steel cables away from the movable frame, and the bracket is used to place the tensioning jack.

[0006] Compared with existing technologies, this utility model has the following advantages: By detachably connecting the support frame, travel frame, and bracket, it can be disassembled before use and transported to the inside of the box girder from the reserved opening. After reassembly, the bottom of the support frame is fixed to the threaded grouting hole of the anchor plate body on which the prestressed steel strands need to be anchored with bolts. Then, the bracket is placed on the ground, and the tensioning jack is placed on the bracket. The drive component drives the strand roller to rotate while retracting four steel cables to lift the tensioning jack to the position of the steel strands. The upward and downward movement of the tensioning jack can be controlled by the forward and reverse rotation of the strand roller. The steel strands are passed through the tensioning jack, and the tensioning jack is adjusted along the travel frame until it is installed in the designated position, at which point the prestressing anchoring work can be carried out. This avoids the risks caused by multiple people carrying and installing the tensioning jack and also improves work efficiency.

[0007] Preferably, the travel frame has a travel groove, and the two ends of the movable frame are respectively located in the corresponding travel groove. A screw is rotatably installed in the travel frame, and the screw is threadedly connected to the travel frame.

[0008] Preferably, the driving component includes a worm gear disposed at one end of the stranding roller and a worm gear rotatably disposed on the movable frame, wherein the worm gear meshes with the worm gear.

[0009] Preferably, each steel cable is wound in the same direction on the stranding roller.

[0010] Preferably, the bracket has multiple sets of weight-reducing grooves.

[0011] Preferably, the support frame is made of angle steel.

[0012] Preferably, both the screw and the worm gear are provided with an agitator handle at one end. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model.

[0014] Figure 2 This is an exploded structural diagram of an embodiment of the present invention.

[0015] Figure 3 This is a three-dimensional structural diagram of the lifting device in an embodiment of this utility model.

[0016] Figure 4 This is a schematic diagram of the winding of the steel cable in an embodiment of this utility model.

[0017] In the above attached figures: 1. Support frame; 100. Pier body; 2. Travel frame; 201. Travel groove; 3. Steel cable; 302. Stranded roller; 303. Worm gear; 304. Worm; 4. Bracket; 401. Weight reduction groove; 5. Moving frame; 501. Screw; 502. Directional wheel. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0019] like Figures 1 to 4As shown in the figure, this utility model embodiment proposes a positioning device for a tensioning jack on the upper toothed plate of a large-span continuous box girder. It includes a support frame 1, on which a travel frame 2 is detachably mounted. The bottom of the support frame 1 is detachably connected to the pier body 100. A movable frame 5 is slidably mounted inside the support frame 1 via a drive device. A lifting device includes four sets of directional wheels 502 respectively mounted at the four corners of the bottom side of the movable frame 5, and a stranded roller 302 mounted on the movable frame 5 via a drive component. Four steel cables 3 are mounted on the stranded roller 302. Each steel cable 3 passes through a corresponding directional wheel 502 and is perpendicular to the horizontal plane. The drive component is used to drive the stranded roller 302 to rotate. A bracket 4 is fixedly connected at each of the four corners to the end of the four steel cables 3 away from the movable frame 5. The bracket 4 is used to place the tensioning jack.

[0020] The detailed working process of this embodiment is as follows: The support frame 1, the travel frame 2, and the bracket 4 are detachably connected. Before use, they are disassembled and transported from the reserved opening to the inside of the box girder. After assembly, the support frame 1 is fixed with bolts to the threaded grouting hole of the anchor plate body that needs to anchor the prestressed steel strand. The bracket 4 is then placed on the ground, and the tensioning jack is placed on the bracket 4. The drive unit drives the strand roller 302 to rotate while retracting the four steel cables 3 to lift the tensioning jack to the position of the steel strand. The tensioning jack can be raised and lowered by rotating the strand roller 302. The steel strand is passed through the tensioning jack, and the tensioning jack is adjusted along the travel frame 2 until the tensioning jack is installed in the designated position, and the anchoring prestressing work can be carried out.

[0021] like Figure 2 As shown, the stroke frame 2 has a stroke groove 201, and the two ends of the movable frame 5 are respectively located in the corresponding stroke groove 201. A screw 501 is rotatably installed in the stroke frame 2, and the screw 501 is threadedly connected to the stroke frame 2.

[0022] The detailed working process of this embodiment is as follows: the two ends of the movable frame 5 are respectively located in the corresponding stroke groove 201. The two ends of the movable frame 5 are supported by the tensioning jack. With the setting of the screw 501, the movable frame 5 can be driven to move in the stroke groove 201, thereby adjusting the tensioning jack in the bracket 4 to move closer to or further away from the steel strand.

[0023] like Figure 2 and Figure 3 As shown, the driving component includes a worm gear 303 disposed at one end of the stranding roller 302, and a worm 304 rotatably disposed on the movable frame 5, wherein the worm gear 303 and the worm 304 mesh with each other.

[0024] The detailed working process of this embodiment is as follows: With the worm gear 303 and worm 304 configured, the worm gear 303 is driven to rotate by rotating the worm 304, and the stranding roller 302 rotates synchronously. By changing the direction of the worm 304, the direction of the stranding roller 302 is changed, thereby controlling the four steel cables 3 to drive the bracket 4 to rise and fall. According to the meshing characteristics of the worm gear 303 and worm 304, the meshing tooth surfaces of the two wheels are in line contact, and the load-bearing capacity is much higher than that of the staggered shaft helical gear mechanism. The worm 304 transmission is equivalent to a helical transmission, which is a multi-tooth meshing transmission, so the transmission is smooth and the noise is very small. At the same time, when the lead angle of the worm 304 is less than the equivalent friction angle between the meshing worm gear 303, the mechanism has self-locking property and can achieve reverse self-locking, that is, only the worm 304 can drive the worm gear 303, and the worm gear 303 cannot drive the worm 304, which has an important safety protection function and prevents the tension jack from falling due to its heavy weight.

[0025] like Figure 3 As shown, each steel cable 3 is wound in the same direction on the stranding roller 302.

[0026] The detailed working process of this embodiment is as follows: when the twisting roller 302 is rotated, the four steel cables 3 move synchronously to ensure that the bracket 4 is in a horizontal state when it rises and falls.

[0027] like Figure 2 As shown, the bracket 4 has multiple sets of weight reduction grooves 401.

[0028] The detailed working process of this embodiment is as follows: multiple sets of weight-reducing grooves 401 are evenly distributed on the bracket 4 to reduce the weight of the bracket 4.

[0029] like Figure 1 As shown, support frame 1 is made of angle steel.

[0030] The detailed working process of this embodiment is as follows: The angle structure of the angle steel gives it excellent bearing strength, enabling it to withstand large loads and maintain good performance in harsh environments.

[0031] like Figure 1 As shown, both the screw 501 and the worm gear 304 are equipped with a stirring handle at one end.

[0032] The detailed working process of this embodiment is as follows: the stirring handle is used to rotate the corresponding screw 501 and worm 304.

[0033] The implementation principle of this application embodiment is as follows: By detachably connecting the support frame 1, the travel frame 2, and the bracket 4, the support frame 1 is disassembled before use and transported from the reserved opening to the inside of the box girder. After reassembly, the support frame 1 is fixed with bolts to the threaded grouting hole of the anchor plate body that needs to anchor the prestressed steel strand. The bracket 4 is then placed on the ground, and the tensioning jack is placed on the bracket 4. By rotating the worm gear 304, the worm wheel 303 is driven to rotate, and the strand roller 302 rotates synchronously. By changing the direction of the worm gear 304, the direction of the strand roller 302 is changed, thereby controlling the rise and fall of the bracket 4. The steel strand is passed through the tensioning jack, and the tensioning jack is adjusted along the travel frame 2 until the tensioning jack is installed in the designated position, and the prestressing anchoring work can be carried out.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A tensioning jack positioning device for the inner upper tooth plate of a large-span continuous box girder, installed on the pier body (100), characterized in that, include: A support frame (1) is provided with a travel frame (2) detachably mounted thereon, and the bottom of the support frame (1) is detachably connected to the pier body (100); The movable frame (5) is slidably disposed within the support frame (1) via a drive device; The lifting device includes four sets of directional wheels (502) respectively set at the four corners of the bottom side of the mobile frame (5), and a stranded roller (302) set on the mobile frame (5) by a driving member. The stranded roller (302) is provided with four steel cables (3). Each steel cable (3) passes through the corresponding directional wheel (502) and is perpendicular to the horizontal plane. The driving member is used to drive the stranded roller (302) to rotate. The bracket (4) is fixedly connected at its four corners to the ends of the four steel cables (3) away from the movable frame (5). The bracket (4) is used to place the tensioning jack.

2. The device for positioning the tensioning jack of the inner upper toothed plate of a large-span continuous box girder according to claim 1, characterized in that: The travel frame (2) has a travel groove (201) inside, and the two ends of the movable frame (5) are respectively located in the corresponding travel groove (201). A screw (501) is rotatably installed inside the travel frame (2), and the screw (501) is threadedly connected to the travel frame (2).

3. The device for positioning the tensioning jack of the inner upper toothed plate of a large-span continuous box girder according to claim 2, characterized in that: The driving component includes a worm gear (303) disposed at one end of the stranding roller (302) and a worm (304) rotatably disposed on the movable frame (5), wherein the worm gear (303) meshes with the worm (304).

4. The device for positioning the tensioning jack of the inner upper toothed plate of a large-span continuous box girder according to claim 1, characterized in that: Each of the steel cables (3) is wound in the same direction on the stranding roller (302).

5. The device for positioning the tensioning jack of the inner upper toothed plate of a large-span continuous box girder according to claim 1, characterized in that: The bracket (4) has multiple sets of weight-reducing grooves (401).

6. The device for positioning the tensioning jack of the inner upper toothed plate of a large-span continuous box girder according to claim 1, characterized in that: The support frame (1) is made of angle steel.

7. The device for positioning the tensioning jack of the inner upper toothed plate of a large-span continuous box girder according to claim 3, characterized in that: Both the screw (501) and the worm gear (304) are provided with a stirring handle at one end.

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