Positioning device and method for cable-stayed bridge main girder end cable sleeve

Abstract

This invention discloses a positioning device and method for the cable-stayed bridge main beam end cable sleeve, including a laser transmitter (1) fixed on the reserved cable-passing hole of the steel box girder and a target receiving device (2) fixed on the front end of the cable sleeve; the laser transmitter includes a positioning frame (3) fixed on the reserved cable-passing hole of the steel box girder and a laser emitter (4) set on the positioning frame; the target receiving device includes a positioning frame fixed on the front end of the cable sleeve and a positioning target (5) fixed on the positioning frame; this invention has a simple structure, accurate positioning of the cable sleeve angle, and convenient installation, which improves the concentricity of the cable and the cable sleeve, construction efficiency and construction safety.

Description

Technical Field

[0001] This invention belongs to the field of cable-stayed bridge construction technology, specifically relating to a positioning device and method for the cable sleeve at the end of the main beam of a cable-stayed bridge. Background Technology

[0002] Cable-stayed bridge construction follows the completion of the main tower construction, with the main girder construction taking place after the main tower is completed. During the main girder construction, the tilt angle positioning of the cable sleeves is crucial. The center of the cable sleeve should be concentric with the pre-reserved cable insertion hole on the steel box girder of the main tower. Even a slight deviation in angle positioning can cause friction between the cable and the edge of the cable sleeve, easily damaging the cable and potentially leading to a major accident, posing a safety hazard.

[0003] Traditional construction requires first using a total station to locate the center point. After the cable sleeve is temporarily fixed and installed, the total station is used again to lay out the coordinates of the upper and lower ends. This is not only complex and slow, but more importantly, construction workers cannot determine whether the center of the cable sleeve should be concentric with the reserved cable hole position on the steel box girder of the main tower by observation. Repeated adjustments are required, which affects construction efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a positioning device and method for the cable-stayed bridge main beam end cable-stayed sleeve with accurate angle positioning and convenient installation, so as to improve work efficiency and construction quality.

[0005] The technical solution adopted in this invention is as follows:

[0006] The positioning device for the cable-stayed bridge main beam end cable sleeve includes a laser transmitter fixed to the reserved cable-passing hole on the steel box girder and a target receiver fixed to the front end of the cable sleeve.

[0007] The laser emitting platform includes a positioning frame fixed to the reserved cable-passing hole of the steel box girder and a laser emitter set on the positioning frame; the target receiving device includes a positioning frame fixed to the front end of the cable sleeve and a positioning target fixed on the positioning frame.

[0008] Furthermore, the positioning device also includes a positioning adjustment mechanism, which includes a movable groove on the positioning frame, a perforated clamping plate on the movable groove, a perforated positioning block on the reserved cable-passing hole of the steel box girder or the cable sleeve, and an adjusting bolt; the positioning frame is fixed to the front end of the reserved cable-passing hole of the steel box girder or the cable sleeve through the positioning adjustment mechanism.

[0009] Furthermore, the adjustment mechanism also includes anti-displacement reinforcing bars, with holes made in the clamping plate and positioning block, and the anti-displacement reinforcing bars passing through the holes to fix the positioning frame.

[0010] Furthermore, the positioning block is U-shaped and is located on the inside of the reserved cable-passing hole or the cable sleeve of the steel box girder.

[0011] Furthermore, a fixing nut is provided on the lower side of the positioning block.

[0012] Furthermore, the positioning frame is a cross-shaped positioning frame with movable slots on all four sides.

[0013] The positioning method for the positioning device of the cable sleeve at the main girder end of a cable-stayed bridge includes the following steps:

[0014] Step 1: Set the laser transmitter in the opening of the reserved cable-passing hole in the steel box girder, and set the positioning block inside the reserved cable-passing hole in the steel box girder to fix the initial part of the laser transmitter.

[0015] Step 2: Use a steel ruler to measure and adjust the laser emitter to the center position of the reserved cable-passing hole in the steel box girder. Use the moving groove and positioning adjustment mechanism on the positioning frame to make the positioning block fit tightly against the inner side of the reserved cable-passing hole in the steel box girder. Insert the anti-displacement steel bar and tighten the adjusting bolt.

[0016] Step 3: Set the target receiving device at the upper end of the cable-stayed steel sleeve hole, and fix the target receiving device in the initial part of the hole by setting the positioning block.

[0017] Step 4: Use a steel ruler to measure and adjust the center of the positioning target to the center position of the cable-stayed cable steel sleeve hole. Place the positioning block tightly against the inner side of the cable-stayed cable steel sleeve hole wall, insert the anti-displacement steel bar, and tighten the adjusting bolt to fix the positioning block firmly.

[0018] Step 5: Turn on the laser emitter switch. The laser beam is projected onto the positioning target. Adjust the cable-stayed cable steel sleeve so that the laser beam is aligned with the center of the positioning target. Fix the cable-stayed cable steel sleeve to complete the installation.

[0019] Turn off the laser emitter switch, disassemble the device, and repeat the above steps to complete the construction of other cable-stayed steel sleeves.

[0020] This invention features a simple structure, precise positioning, convenient installation, and strong versatility, improving the concentricity of the stay cables and their sleeves, construction efficiency, and construction safety. Attached Figure Description

[0021] Figure 1 This is a schematic diagram illustrating the application of the present invention in the construction of the main beam;

[0022] Figure 2 This is a schematic diagram of the structure of the laser emitting station of the present invention;

[0023] Figure 3 This is a schematic diagram of the adjustment mechanism of the present invention;

[0024] Figure 4 A schematic diagram of the laser transmitter of the present invention fixed on the reserved cable-passing hole of the steel box girder;

[0025] Figure 5 This is a schematic diagram of the target receiving device of the present invention fixed at the front end of the cable sleeve. Implementation

[0026] The invention will now be further described in conjunction with the accompanying drawings and embodiments.

[0027] like Figure 1 , Figure 2 As shown, the positioning device for the cable sleeve at the main beam end of the cable-stayed bridge includes a laser transmitter 1 fixed on the reserved cable-passing hole of the steel box girder and a target receiver 2 fixed on the front end of the cable sleeve.

[0028] like Figure 3 , Figure 4 , Figure 5 As shown, the laser emitting platform comprises a positioning frame 3 fixed to the reserved cable-passing hole A on the steel box girder and a laser emitter 4 set on the positioning frame. The laser emitter can emit a dot-shaped linear laser beam 4a. The target receiving device comprises a positioning frame fixed to the front end B of the cable sleeve and a target receiving plate 5 fixed on the positioning frame. The target is a red plastic plate with relevant positioning lines and scales. The positioning frame can be made of two channel steels welded into a cross positioning frame with movable slots on all four sides. A round hole is left at the midpoint of the cross intersection. The laser emitter 4 can be glued into the round hole. Other methods can also be used to fix the laser emitter.

[0029] Because the sizes of the cable-stayed tubes and the pre-reserved cable-passing holes on the steel box girders of the main tower vary, the positioning device of this apparatus also includes a positioning adjustment mechanism. The positioning adjustment mechanism includes a movable slot 3a on the positioning frame, a perforated clamping plate 6 on the movable slot, a perforated positioning block 7 on the pre-reserved cable-passing hole of the steel box girder or the cable-stayed tube, and an adjusting bolt 8. The positioning frame is fixed to the pre-reserved cable-passing hole of the steel box girder or the front end of the cable-stayed tube via the positioning adjustment mechanism, allowing the laser transmitter and target receiver to be conveniently and quickly fixed to the pre-reserved cable-passing hole of the steel box girder and the cable-stayed tube. The front end of the cable sleeve is highly versatile; the clamp can be made of thick steel plate with an adjustment bolt mounting hole in the middle of the plate. The adjustment mechanism can also be equipped with anti-displacement steel bars 9 to prevent the positioning block from rotating together when the adjustment bolt is tightened. Holes 7a are opened on the clamp and positioning block, and a fixing nut 10 is set on the lower side of the positioning block. The positioning block can be welded from thick steel plate into a gantry shape and set on the inside of the reserved cable hole of the steel box girder or the cable sleeve to facilitate the fixing of the laser transmitter 1. The positioning frame is fixed to the front end of the reserved cable hole of the steel box girder or the cable sleeve through the positioning adjustment mechanism.

[0030] The positioning method for the positioning device of the cable sleeve at the main girder end of a cable-stayed bridge includes the following steps:

[0031] Step 1: Set the laser transmitter in the opening of the pre-reserved cable-passing hole in the steel box girder, place the positioning block in the hole, and fix the laser transmitter in place.

[0032] Step 1: Set the laser transmitter in the opening of the reserved cable-passing hole in the steel box girder, and set the positioning block inside the reserved cable-passing hole in the steel box girder to fix the initial part of the laser transmitter.

[0033] Step 2: Use a steel ruler to measure and adjust the laser emitter to the center position of the reserved cable-passing hole in the steel box girder. Use the moving groove and positioning adjustment mechanism on the positioning frame to make the positioning block fit tightly against the inner side of the reserved cable-passing hole in the steel box girder. Insert the anti-displacement steel bar and tighten the adjusting bolt.

[0034] Step 3: Set the target receiving device at the upper end of the cable-stayed steel sleeve hole, and fix the target receiving device in the initial part of the hole by setting the positioning block.

[0035] Step 4: Use a steel ruler to measure and adjust the center of the positioning target to the center position of the cable-stayed cable steel sleeve hole. Place the positioning block tightly against the inner side of the cable-stayed cable steel sleeve hole wall, insert the anti-displacement steel bar, and tighten the adjusting bolt to fix the positioning block firmly.

[0036] Step 5: Turn on the laser emitter switch, project the laser beam onto the positioning target, adjust the cable-stayed steel sleeve so that the laser beam is aligned with the center of the positioning target, fix the cable-stayed steel sleeve to complete the installation, turn off the laser emitter switch, disassemble the device, and repeat the above steps to complete the construction of other cable-stayed steel sleeves.

[0037] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A positioning device for a cable stay tube of a cable-stayed bridge main girder end, characterized in that, The application relates to a laser positioning device for a cable-stayed bridge, which comprises a laser emitter (1) fixed on a reserved cable-through hole of a steel box girder and a target receiving device (2) fixed on the front end of a cable-stayed bridge sleeve. The laser emitter comprises a positioning frame (3) fixed on the reserved cable-through hole of the steel box girder and a laser emitter (4) arranged on the positioning frame; the target receiving device comprises a positioning frame fixed on the front end of the cable-stayed bridge sleeve, a positioning target (5) fixed on the positioning frame, a moving groove (3a) arranged on the positioning frame, a clamping plate (6) with holes arranged on the moving groove, a positioning block (7) with holes arranged on the reserved cable-through hole of the steel box girder or the cable-stayed bridge sleeve, and adjusting bolts (8); the positioning frame is fixed on the front end of the reserved cable-through hole of the steel box girder or the cable-stayed bridge sleeve through an adjusting mechanism composed of the moving groove, the clamping plate, the positioning block and the adjusting bolts; the center of the positioning target coincides with the central axis of the cable-stayed bridge sleeve; the positioning frame is a cross-shaped positioning frame, and the moving grooves are arranged on four sides of the positioning frame; the adjusting mechanism further comprises anti-displacement steel bars (9) which are arranged through the holes (7a) in the clamping plate and the positioning block to fix the positioning frame; the positioning block is in a door-shaped structure and is arranged on the inner side of the reserved cable-through hole of the steel box girder or the cable-stayed bridge sleeve; a fixed nut (10) is arranged on the lower side of the positioning block.

2. The positioning method of the positioning apparatus according to claim 1, wherein The application further relates to a positioning method of the laser positioning device. Step 1: the laser emitter is arranged at the hole of the reserved cable-through hole of the steel box girder, and the positioning block is arranged on the inner side of the reserved cable-through hole of the steel box girder to preliminarily fix the laser emitter; Step 2: the laser emitter is adjusted to the center of the reserved cable-through hole of the steel box girder by measuring with a steel ruler, the positioning block is tightly arranged on the inner side of the wall of the reserved cable-through hole of the steel box girder through the moving groove and the adjusting mechanism of the positioning frame, the anti-displacement steel bar is inserted, and the adjusting bolt is tightly screwed; Step 3: the target receiving device is arranged on the upper hole of the cable-stayed bridge sleeve, and the positioning block is arranged on the hole to preliminarily fix the target receiving device; Step 4: the center of the positioning target is adjusted to the center of the hole of the cable-stayed bridge sleeve by measuring with a steel ruler, the positioning block is tightly arranged on the inner side of the wall of the hole of the cable-stayed bridge sleeve, the anti-displacement steel bar is inserted, and the adjusting bolt is tightly screwed to fix the positioning block firmly; Step 5: the switch of the laser emitter is turned on, the laser ray is projected on the positioning target, the cable-stayed bridge sleeve is adjusted to align the laser ray with the center of the positioning target, the cable-stayed bridge sleeve is fixed, and the installation work is completed.

Images