CN110528379A - A steel strand protection structure for long-span beams - Google Patents

Abstract

The invention discloses a steel strand protection structure for long-span girders, and relates to the technical field of main girders. Protective devices are installed between both sides and the main beam. Each set of protective devices includes multiple through holes, multiple steel strands and tensioning mechanisms; the tensioning mechanism includes installation slots, horizontal shafts and two drive motors; horizontal shafts The two ends of each steel strand are respectively detachably connected to the output shafts of the two drive motors; each steel strand is provided with connecting plates at both ends, and multiple sets of first drive components are installed in the installation groove; each set of first drive components includes a second A lead screw, a grip part, a worm and a worm wheel; the first lead screw is threadedly connected to the connecting plate. The present invention can protect the main girder to a certain extent by arranging the protective device, thereby prolonging the service life of the main girder.

Description

A steel strand protection structure for long-span beams

technical field

The invention relates to the technical field of main girders, more specifically, it relates to a steel strand protection structure for long-span girders.

Background technique

Main beams generally refer to structures erected on rivers, lakes and seas to allow vehicles and pedestrians to pass smoothly. In order to adapt to the modern high-speed development of the transportation industry, the main girder is also extended to a building that is erected to make traffic more convenient and erected across mountain streams, unfavorable geology, or to meet other transportation needs. The main girder is generally composed of superstructure, substructure, support and auxiliary structures. The superstructure is also called bridge span structure, which is the main structure for crossing obstacles; The force transmission device installed at the supporting place of the bridge pier or abutment; the auxiliary structure refers to the bridge head board, conical slope protection, bank protection, diversion engineering, etc.

The prior art can refer to the Chinese invention patent application document with the authorized announcement number CN110004819A, which discloses a main girder and bridge pier fixed structure of a long-span main girder and its construction method, including prefabricated main girder main girder and bridge pier. The bridge pier is a steel structure, the main beam and the bridge pier are connected together by bolts; the upper end of the bridge pier is welded with a lower flange, and the lower side of the main beam is provided with an upper flange on the upper side of the lower flange. There are holes on the main beam that correspond to the bolt holes on the upper flange one by one. The bolts pass through the holes, the upper flange and the lower flange from top to bottom, and then pass through the holes located on the lower side of the lower flange. Nut locked. The main girder and pier fixed structure of the large-span main girder of the present invention connects the pier and the main girder through flanges and bolts as a whole, which can well realize the integrity of the structure and the transition of rigidity, so that the main girder and the pier can be used together. During the process, there will be no stress concentration phenomenon or bridge pier offset and other diseases, the connection between the main beam and the bridge pier will be strengthened, the bearing capacity of the main beam and the bridge pier will be improved, and the seismic performance of the main beam will be enhanced.

However, the above-mentioned main beam is not provided with a protective device, so the main beam is prone to deformation under the rolling of the vehicle for a long time, which may shorten the service life of the main beam.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a steel strand protection structure for large-span beams, which can protect the main girder to a certain extent by providing a protective device, thus extending the length of the main girder. service life.

In order to achieve the above object, the present invention provides the following technical solution: a steel strand protection structure for long-span beams, including bridge piers and main beams, and a plurality of support frames for supporting the main beams are arranged between the bridge piers A protective device is installed between both sides of each said support frame and the main beam, and each group of said protective devices includes a plurality of through holes arranged vertically on one side of the support frame, one-to-one corresponding A plurality of steel strands in a plurality of through holes and a tightening mechanism installed on one side of the main girder for tightening the plurality of steel strands; The installation slot provided in the length direction of the main girder, the horizontal shaft rotatably connected in the installation slot and arranged along the length direction of the main girder, and two driving motors respectively arranged at both ends of the horizontal shaft; the two ends of the horizontal shaft are respectively detachable Connected to the output shafts of the two driving motors; each of the two ends of the steel strands is respectively provided with a connecting plate, and a plurality of sets of connecting plates corresponding to the connecting plates are installed in the mounting groove for driving connection. The first driving assembly for the plate to move vertically; each set of the first driving assembly includes a first lead screw connected vertically to the bottom of the installation groove through a thrust bearing, and a grip part fixed to the top of the first lead screw , a worm detachably connected to the horizontal shaft through bolts, and a worm gear detachably connected to the first lead screw through bolts and engaged with the worm; the first lead screw is threadedly connected to the connecting plate.

By adopting the above technical solution, the drive motor is started, the output shaft of the drive motor drives the horizontal shaft to rotate, the horizontal shaft rotates to drive the worm to rotate, the worm rotates to drive the worm wheel to rotate, the worm wheel to drive the first lead screw to rotate, and the first lead screw to rotate to drive the connecting plate Moving down, the connecting plate moves down to tighten the steel strand; tensioning the prestressed steel strand is to apply a force opposite to the load to the main girder before bearing the load. When the main girder is under load, the load First of all, this part of the prestress must be offset, and then the main girder is stressed, which increases the bearing capacity of the main girder, which can protect the main girder to a certain extent, thus prolonging the service life of the main girder.

The present invention is further configured as follows: a clamping mechanism for clamping steel strands is installed in the installation groove corresponding to the connecting plate, and the clamping mechanism includes a support plate fixedly connected to the bottom of the installation groove, and a support plate rotatably connected to the support plate. The second lead screw on the top and horizontally arranged, the left thread and the right thread respectively arranged at the two ends of the second lead screw, two splints screwed to the left thread and the right thread respectively and arranged between the connecting plate and the supporting plate for A second drive assembly that drives the second lead screw to rotate; sliders are fixedly connected to the bottoms of the two splints, and slide slots for the sliders to slide in the horizontal direction are provided on the top of the support plate.

By adopting the above technical solution, the second screw is driven to rotate through the second drive assembly, and the rotation of the second screw drives the two splints to move toward each other, so that the steel strand can be further fixed, thus reducing the risk of pedestrians being injured by the steel strand possibility.

The present invention is further provided that: the second driving assembly includes a vertically arranged rack fixed to one side of the connecting plate and a gear detachably connected to the second lead screw through bolts; the rack and the gear are connected to each other engage.

By adopting the above technical solution, the downward movement of the connecting plate drives the rack to move downward, the downward movement of the rack drives the rotation of the gear, and the rotation of the gear drives the rotation of the second lead screw, thus eliminating the need for the operator to apply additional force, thereby reducing the operator's workload Labor intensity.

The present invention is further configured as follows: each of the two ends of the steel strand is respectively sleeved with a protective sleeve, the inner diameter of the protective sleeve is larger than the outer diameter of the steel strand, and the protective sleeve includes a The fixed tube on the side and the movable tube which is slidably connected to the end of the fixed tube away from the support frame along the axial direction of the fixed tube, and the end of the movable tube away from the fixed tube is fixed by bolts.

By adopting the above technical scheme, by setting the fixed tube and the movable tube, it is convenient to adjust the length of the protective cover, so that the protective cover can be applied to steel strands of different lengths; moreover, by setting the protective cover, the steel strand can be reduced. The possibility of jumping and injuring pedestrians after a break occurs.

The present invention further provides that: the inner side wall of the movable tube is fixedly connected with a bar-shaped block, and the outer side wall of the fixed tube is provided with a bar-shaped groove for the bar-shaped block to slide along the axial direction of the fixed tube.

By adopting the above technical solution, the bar-shaped groove has a guiding effect on the bar-shaped block, thereby reducing the possibility of deviation of the movable tube during axial sliding along the fixed tube.

The present invention is further set as follows: a tensioning assembly is installed at both ends of each said through hole, and each set of said tensioning assembly includes a fixing frame affixed to one side of the supporting frame, and a horizontally arranged The rotating shaft, two torsion springs respectively sleeved on both ends of the rotating shaft, the connecting arm fixed to the rotating shaft and arranged obliquely, and the guide wheel fixed on the end of the connecting arm away from the rotating shaft; the opposite ends of the two torsion springs are respectively fixed on On both sides of the connecting arm, the ends of the two torsion springs which are far away from each other are fixedly connected to the two opposite inner sides of the fixing frame respectively.

By adopting the above technical scheme, when the steel strand is installed, the steel strand rotates the rotating shaft, and the rotation of the rotating shaft compresses the torsion spring, and the torsion spring is in a compressed state at this time; At this time, under the action of the torsion spring, the steel strands can be tightened, so that the steel strands can protect the main girder.

The present invention is further set as: the output shaft of the drive motor is equipped with a connection mechanism for connecting the horizontal shaft, the connection mechanism includes a relief groove opened on the end surface of the output shaft of the drive motor close to the horizontal shaft, a A connecting block that is axially slidably connected to the relief groove, a square groove opened at the end of the connecting block near the horizontal axis, a square block that is fixed at the end of the horizontal shaft near the connecting block and inserted into the square groove, and installed on the connecting block. It is a fixing component for fixing the square block; a T-shaped block is fixedly connected to the outer wall of the connecting block, and a hole for the axial sliding of the T-shaped block along the horizontal axis is opened on the inner wall of the said relief groove. T-slot.

By adopting the above technical solution, when the horizontal axis needs to be driven to rotate, the square block is inserted into the square slot by moving the connecting block, and then the square block is fixed by the fixing component, so that the output shaft of the drive motor drives the horizontal axis to rotate, and then Alternatively, when the horizontal shaft does not need to rotate, the output shaft of the driving motor can be separated from the horizontal shaft, thereby reducing the possibility of safety accidents caused by the driving motor due to accidental startup.

The present invention is further provided that: the fixing assembly includes a bolt that is slidably connected to the connecting block along the radial direction of the horizontal axis, a stopper that is sleeved and fixed on the bolt, a spring that is sleeved on the bolt, and a bolt that is set on one side of the square block hole; one end of the bolt is set through the connecting block and extends into the square groove to be inserted into the socket, and the other end is fixedly connected with a handle; the stopper is between the handle and the connecting block, and the two ends of the spring are fixed respectively. Connected to connecting block and stopper.

By adopting the above technical scheme, when the square block needs to be plugged into the square groove, the bolt is pulled by pulling the handle, and then the connecting block can be moved to make the square block plug into the square groove. The block moves to stretch the spring, and the spring is in a stretched state at this time; when the square block is inserted into the square slot, release the handle, and the stopper drives the pin and the socket under the action of the spring; When separating the square block from the square slot, pull the handle to pull the pin to separate the pin from the socket, and then move the connecting block; in summary, by setting the fixing component, it is convenient to insert the square block into the square slot, thus reducing the operating cost. Labor intensity of personnel.

The present invention is further configured as follows: the top of the installation groove is sequentially installed with a plurality of protective covers along its length direction, and the bottom of the installation groove is sequentially installed with a plurality of drainage pipes along its length direction, and the drainage pipes are far away from the bottom of the installation groove. One end is set through one side of the main girder.

By adopting the above-mentioned technical solution, by providing a protective cover, the possibility of pedestrians stepping on air can be reduced; by providing a drainage pipe, the rainwater in the installation groove can be discharged in time, thereby reducing the possibility of short circuit of the drive motor due to water ingress.

In summary, compared with the prior art, the present invention has the following beneficial effects:

1. Start the drive motor, the output shaft of the drive motor drives the horizontal shaft to rotate, the horizontal shaft rotates to drive the worm to rotate, the worm to drive the worm wheel to rotate, the worm wheel to drive the first lead screw to rotate, the first lead screw to drive the connecting plate to move downward, The connecting plate moves down to tighten the steel strand; the tension of the prestressed steel strand is to apply a force opposite to the load to the main girder before bearing the load. When the main girder is under load, the load must first offset this Partial prestressing, and then the main beam is stressed, which increases the bearing capacity of the main beam, which can protect the main beam to a certain extent, thus prolonging the service life of the main beam;

2. The downward movement of the connecting plate drives the rack to move downward, the downward movement of the rack drives the gear to rotate, and the rotation of the gear drives the second screw to rotate, so that no additional force is required from the operator, thus reducing the labor intensity of the operator;

3. When installing the steel strand, the steel strand rotates the shaft, and the rotation of the shaft compresses the torsion spring. At this time, the torsion spring is in a compressed state; Under the action of the spring, the steel strands can be tightened, so that the steel strands can protect the main girder.

Description of drawings

Fig. 1 is the overall structure schematic diagram of embodiment;

Fig. 2 is the schematic structural view of highlighting the protective device in the embodiment;

Fig. 3 is a schematic structural view highlighting the tightening mechanism in the embodiment;

Fig. 4 is a schematic structural view of a protruding sleeve in an embodiment;

Fig. 5 is a schematic structural view of a protruding protective cover in an embodiment;

Fig. 6 is a structural schematic diagram highlighting the connecting mechanism in the embodiment;

Fig. 7 is a schematic structural view of a protruding protective cover in an embodiment;

FIG. 8 is a partial enlarged view of A in FIG. 5 .

In the figure: 10, bridge pier; 11, main girder; 12, support frame; 2, protective device; 21, through hole; 22, steel strand; 3, tightening mechanism; 31, installation groove; 32, horizontal axis; 33 , driving motor; 34, connecting plate; 35, connecting ear; 36, bushing; 37, first driving component; 371, first screw; 372, gripping part; 373, worm; 374, worm gear; Mechanism; 41, give way slot; 411, T-shaped slot; 42, connecting block; 421, T-shaped block; 43, square slot; 44, square block; 45, fixed component; 451, latch; 452, stopper; 453 , spring; 454, jack; 455, handle; 5, clamping mechanism; 51, support plate; 511, chute; 52, second lead screw; 53, left thread; 54, right thread; 55, splint; 551 , slider; 56, second drive assembly; 561, rack; 562, gear; 6, protective cover; 61, fixed tube; 611, strip groove; 612, pole; 7, tension assembly; 71, fixed frame; 72, rotating shaft; 73, torsion spring; 74, connecting arm; 75, guide wheel; 8, protective cover; 9, drainpipe.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings. Wherein the same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "bottom" and "top "Face", "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.

Embodiment: A steel strand protection structure for long-span beams, as shown in Figure 1, includes bridge piers 10 and main beams 11, and a plurality of support frames 12 for supporting the main beams 11 are arranged between the bridge piers 10, A protective device 2 is installed between both sides of each supporting frame 12 and the main beam 11 .

As shown in Figures 1 and 2, each set of protective devices 2 includes a plurality of through holes 21 arranged vertically on one side of the support frame 12, and a plurality of steel strands passing through the plurality of through holes 21 in one-to-one correspondence. Wire 22 and the tightening mechanism 3 installed on one side of the main beam 11 for making a plurality of steel strands 22 tight; as shown in Figure 3 and Figure 4, the tightening mechanism 3 includes a A mounting groove 31 arranged on the side and along the length direction of the main beam 11, a horizontal shaft 32 rotatably connected in the mounting groove 31 and arranged along the length direction of the main beam 11, and two drive motors 33 respectively arranged at both ends of the horizontal shaft 32; The driving motor 33 can be selected from an asynchronous motor or a forward and reverse motor; the two ends of the horizontal shaft 32 are respectively detachably connected to the output shafts of the two driving motors 33; The top of the plate 34 is threadedly connected with a connecting ear 35, and one end of the steel strand 22 is connected to the connecting ear 35 through a casing 36. The tube 36 can be deformed; multiple groups of first drive assemblies 37 corresponding to the connection plates 34 are installed in the mounting groove 31 to drive the connection plates 34 to move vertically; each group of first drive assemblies 37 includes a thrust The bearing is vertically rotatably connected to the first lead screw 371 at the bottom of the mounting groove 31, the grip part 372 fixed to the top of the first lead screw 371, the worm 373 detachably connected to the horizontal shaft 32 by bolts and detachably connected by bolts The worm wheel 374 on the first lead screw 371 and meshed with the worm 373; the thrust bearing can withstand a relatively large load, thus facilitating the protection of the main beam 11 by the steel strand 22; the first lead screw 371 is threadedly connected to the connecting plate 34; The worm 373 is detachably connected to the horizontal shaft 32, which is convenient for replacing individual damaged steel strands 22. Start the drive motor 33, the output shaft of the drive motor 33 drives the horizontal shaft 32 to rotate, the horizontal shaft 32 rotates to drive the worm screw 373 to rotate, the worm screw 373 rotates to drive the worm wheel 374 to rotate, the worm wheel 374 rotates to drive the first lead screw 371 to rotate, the first lead screw 371 The rotation drives the connecting plate 34 to move downward, and the downward movement of the connecting plate 34 can make the steel strand 22 tight; the tension of the prestressed steel strand 22 is to apply a force opposite to the load to the main beam 11 before bearing the load. , when the main girder 11 is under load, the load must first offset this part of the prestress, and then the main girder 11 is stressed, which increases the bearing capacity of the main girder 11, thereby being able to play a certain protective role on the main girder 11, Therefore, the service life of the main girder 11 can be extended.

As shown in Fig. 5 and Fig. 6, the top of installation groove 31 is installed with a plurality of protective cover 8 successively along its length direction, and protection cover 8 can be fixed on the installation groove 31 by bolt, and the bottom of installation groove 31 is sequentially along its length direction. A plurality of drainage pipes 9 are installed, and one end of the drainage pipes 9 away from the installation groove 31 is set through one side of the main beam 11 . By arranging the protective cover 8, the possibility of pedestrians stepping on air can be reduced; by arranging the drain pipe 9, the rainwater in the installation groove 31 can be discharged in time, thereby reducing the possibility of the drive motor 33 being short-circuited due to water ingress.

The output shaft of the driving motor 33 is equipped with a connecting mechanism 4 for connecting the horizontal shaft 32. The connecting mechanism 4 includes a relief groove 41 opened on the output shaft of the driving motor 33 close to the end surface of the horizontal shaft 32, along the axial direction of the horizontal shaft 32. The connecting block 42 slidingly connected to the relief groove 41, the square groove 43 opened on the end of the connecting block 42 close to the horizontal shaft 32, the square block fixed on the end of the horizontal shaft 32 close to the connecting block 42 and plugged into the square groove 43 44 and the fixing assembly 45 that is installed on the connecting block 42 for fixing the square block 44; the outer wall of the connecting block 42 is affixed with a T-shaped block 421, and the inner wall of the relief groove 41 is provided with a T-shaped block for 421 is a T-shaped slot 411 that slides in the axial direction of the horizontal shaft 32 . When it is necessary to drive the horizontal shaft 32 to rotate, the square block 44 is plugged into the square slot 43 by moving the connecting block 42, and then the square block 44 is fixed by the fixing assembly 45, so that the output shaft of the driving motor 33 drives the horizontal shaft 32 to rotate Furthermore, when the rotation of the horizontal shaft 32 is not required, the output shaft of the drive motor 33 can be separated from the horizontal shaft 32, thereby reducing the possibility of accidents caused by the drive motor 33 due to accidental activation.

The fixing assembly 45 includes a pin 451 slidingly connected to the connecting block 42 in the radial direction of the horizontal axis 32 , a stopper 452 sleeved and fixed on the pin 451 , a spring 453 sleeved on the pin 451 , and a spring 453 set on one side of the square block 44 . The jack 454; one end of the latch 451 is set through the connecting block 42 and extends into the square groove 43 to be inserted into the jack 454, and the other end is fixedly connected with a handle 455; the stopper 452 is between the handle 455 and the connecting block 42, and the spring 453 The two ends of each are fixedly connected to the connecting block 42 and the stopper 452 respectively. When it is necessary to make the square block 44 and the square slot 43 plugged in, pull the latch 451 by pulling the handle 455, then the movable connecting block 42 makes the square block 44 plugged with the square slot 43, and the latch 451 moves to drive the stopper 452 Move, the block 452 moves to stretch the spring 453, and the spring 453 is in a stretched state; The lower drive pin 451 is plugged into the jack 454; when the square block 44 is separated from the square slot 43, the pin 451 is pulled by the handle 455 to separate the pin 451 from the jack 454, and then the connecting block 42 is moved; in summary , by setting the fixing assembly 45, it is convenient to insert the square block 44 into the square groove 43, thereby reducing the labor intensity of the operator.

As shown in Figures 2 and 4, the corresponding connecting plate 34 is installed with a clamping mechanism 5 for clamping the steel strand 22 in the installation groove 31, and the clamping mechanism 5 includes a support plate 51 fixed to the bottom of the installation groove 31, Rotationally connected to the top of the support plate 51 and the second lead screw 52 arranged horizontally, the left screw thread 53 and the right screw thread 54 respectively arranged at the two ends of the second lead screw 52, and the two screw threads connected to the left screw thread 53 and the right screw thread 54 respectively. Clamping plate 55 and the second driving assembly 56 that is arranged between connecting plate 34 and supporting plate 51 and is used to drive second screw 52 to rotate; There is a chute 511 for the slider 551 to slide horizontally. The second lead screw 52 is driven to rotate by the second drive assembly 56, and the second lead screw 52 rotates to drive the two splints 55 to move toward each other, so that the steel strand 22 can be further fixed, thereby reducing the risk of the steel strand 22 jumping and hurting pedestrians possibility.

The second drive assembly 56 includes a rack 561 fixed to one side of the connecting plate 34 and vertically arranged and a gear 562 detachably connected to the second lead screw 52 by bolts; the rack 561 and the gear 562 are meshed with each other; the gear 562 can be The connection to the second lead screw 52 is disassembled. When the second lead screw 52 does not need to rotate, the gear 562 can be separated from the rack 561 , so as to facilitate the movement of the splint 55 . The downward movement of the connecting plate 34 drives the rack 561 to move downward, the downward movement of the rack 561 drives the rotation of the gear 562, and the rotation of the gear 562 drives the rotation of the second lead screw 52, thereby eliminating the need for additional force from the operator, thereby reducing the operator's effort. Labor intensity.

As shown in Figure 2 and Figure 7, the two ends of each steel strand 22 are respectively sleeved with a protective cover 6, the inner diameter of the protective cover 6 is greater than the outer diameter of the steel strand 22, and the protective cover 6 includes a bolt fixed to the support The fixed tube 61 on one side of the frame 12 and the movable tube 62 connected to the fixed tube 61 away from the end of the support frame 12 along the axial slide of the fixed tube 61; The outer wall of the outer wall is provided with a strip groove 611 for the axial sliding of the strip block 621 along the fixed pipe 61; the end of the movable pipe 62 away from the fixed pipe 61 is fixed on the protective plate 8 by bolts; in order to facilitate the installation of the fixed pipe 61 For fixing, the pole 612 can be welded on the end of the fixed pipe 61 away from the movable pipe 62 first, and then the pole 612 can be fixed to the support frame 12 by bolts. By setting the fixed tube 61 and the movable tube 62, it is convenient to adjust the length of the protective cover 6, so that the protective cover 6 is suitable for steel strands 22 of different lengths; moreover, by setting the protective cover 6, the steel strand can be reduced. 22 Possibility of jumping and injuring pedestrians after breaking.

As shown in Figure 5 and Figure 8, tension assemblies 7 are installed at both ends of each through hole 21, and each group of tension assemblies 7 includes a fixed frame 71 affixed to one side of the support frame 12, and is rotatably connected to the fixed frame. 71 and a horizontally arranged rotating shaft 72, two torsion springs 73 respectively sleeved at both ends of the rotating shaft 72, a connecting arm 74 fixed to the rotating shaft 72 and arranged obliquely, and a guide wheel 75 fixed to the connecting arm 74 away from the end of the rotating shaft 72; The opposite ends of the two torsion springs 73 are fixedly connected to both sides of the connecting arm 74 respectively, and the ends of the two torsion springs 73 which are far away from each other are fixedly connected to two opposite inner sides of the fixing frame 71 respectively. When the steel strand 22 is installed, the steel strand 22 rotates the rotating shaft 72, and the rotating shaft 72 rotates to compress the torsion spring 73. At this time, the torsion spring 73 is in a compressed state; , at this time, the steel strand 22 can be tightened under the action of the torsion spring 73, so that the steel strand 22 can protect the main girder 11.

The working principle of this steel strand protective structure for long-span beams is as follows:

Pull the latch 451 by pulling the handle 455, and the latch 451 moves so that the spring 453 is in a compressed state; Under the action, it is plugged with the jack 454, so that the output shaft of the driving motor 33 can be connected with the horizontal shaft 32; then the driving motor 33 is started, and the output shaft of the driving motor 33 drives the horizontal shaft 32 to rotate, and the horizontal shaft 32 rotates to drive the worm 373 rotates, and the worm screw 373 rotates and drives the worm wheel 374 to rotate, and the worm wheel 374 rotates and drives the first lead screw 371 to rotate, and the first lead screw 371 rotates to drive the connecting plate 34 to move downward, and the connecting plate 34 moves downward to make the steel strand 22 stretch tight.

The above descriptions are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (9)

1. a steel strand protection structure for long-span beams, characterized in that: comprise bridge piers (10) and main girders (11), a plurality of bridge piers (10) for supporting main beams ( 11) of the support frame (12), the two sides of each said support frame (12) and the main girder (11) are all equipped with guards (2), and each group of said guards (2) includes To a plurality of through holes (21) arranged on one side of the support frame (12) in sequence, a plurality of steel strands (22) passing through the plurality of through holes (21) in one-to-one correspondence and installed on the main girder (11) ) is used to tighten the tightening mechanism (3) on one side of a plurality of steel strands (22); The tightening mechanism (3) includes a mounting groove (31) opened on one side of the top of the main beam (11) and arranged along the length direction of the main beam (11), rotatably connected in the mounting groove (31) and along the main beam (11). A horizontal shaft (32) arranged in the length direction of the beam (11) and two driving motors (33) respectively arranged at both ends of the horizontal shaft (32); the two ends of the horizontal shaft (32) are respectively detachably connected to two The output shaft of the drive motor (33); the two ends of each of the steel strands (22) are respectively provided with connecting plates (34), and multiple groups of connecting plates are installed in the mounting slots (31). (34) one-to-one corresponding first driving assembly (37) for driving the connecting plate (34) to move vertically; The first driving assembly (37) of each group includes a first lead screw (371) connected vertically to the bottom of the mounting groove (31) through a thrust bearing, and a grip fixed to the top of the first lead screw (371). part (372), the worm (373) that is detachably connected to the horizontal shaft (32) by bolts, and the worm wheel (374) that is detachably connected to the first lead screw (371) and meshed with the worm (373) by bolts; The first lead screw (371) is screwed to the connecting plate (34). 2. A steel strand protection structure for large-span beams according to claim 1, characterized in that: corresponding to the connecting plate (34), a steel strand for clamping steel strand is installed in the installation groove (31) (22) of the clamping mechanism (5), the clamping mechanism (5) includes a support plate (51) fixed to the bottom of the installation groove (31), a top that is rotatably connected to the support plate (51) and is horizontally arranged. The second lead screw (52), the left screw thread (53) and the right screw thread (54) that are respectively arranged at the two ends of the second lead screw (52), and the two screw threads connected to the left screw thread (53) and the right screw thread (54) respectively. The clamping plate (55) and the second driving assembly (56) that is arranged between the connecting plate (34) and the support plate (51) for driving the second lead screw (52) to rotate; the bottoms of the two clamping plates (55) Slide blocks (551) are fixedly connected, and the top of the support plate (51) is provided with a slide groove (511) for the slide blocks (551) to slide in the horizontal direction. 3. A steel strand protection structure for large-span beams according to claim 2, characterized in that: the second drive assembly (56) includes a vertical motor fixed on one side of the connecting plate (34). The provided rack (561) and the gear (562) detachably connected to the second lead screw (52) through bolts; the rack (561) and the gear (562) mesh with each other. 4. A kind of steel strand protection structure for large-span beams according to claim 1, characterized in that: the two ends of each said steel strand (22) are respectively sleeved with protective sleeves (6), The inner diameter of the protective cover (6) is greater than the outer diameter of the steel strand (22), and the protective cover (6) includes a fixed tube (61) fixed to one side of the support frame (12) by bolts and a fixed tube along the fixed tube. The axial slip of (61) is connected to the movable pipe (62) of one end of the fixed pipe (61) away from the support frame (12), and the end of the movable pipe (62) away from the fixed pipe (61) is fixed by bolts. 5. A steel strand protection structure for large-span beams according to claim 4, characterized in that: a strip block (621) is affixed to the inner side wall of the movable pipe (62), and the fixed The outer wall of the tube (61) is provided with a bar-shaped groove (611) for the bar-shaped block (621) to slide along the axial direction of the fixed tube (61). 6. A steel strand protection structure for large-span beams according to claim 1, characterized in that: tension assemblies (7) are installed at both ends of each said through hole (21), and each The tensioning assembly (7) of the set includes a fixed frame (71) affixed to one side of the support frame (12), a rotating shaft (72) that is rotatably connected to the fixed frame (71) and arranged horizontally, and is respectively sleeved on the rotating shaft ( 72) Two torsion springs (73) at both ends, a connecting arm (74) fixed to the rotating shaft (72) and arranged obliquely, and a guide wheel (75) fixed to the end of the connecting arm (74) away from the rotating shaft (72); The opposite ends of the two torsion springs (73) are respectively affixed to both sides of the connecting arm (74), and the mutually distant ends of the two torsion springs (73) are respectively affixed to the opposite ends of the fixing frame (71). inside. 7. A steel strand protection structure for large-span beams according to claim 1, characterized in that: the output shaft of the drive motor (33) is equipped with a connecting mechanism for connecting the horizontal shaft (32) (4), the connecting mechanism (4) includes a relief groove (41) provided on the output shaft of the drive motor (33) close to the end surface of the horizontal shaft (32), and an axial sliding connection along the horizontal shaft (32) The connection block (42) in the give way groove (41), the square groove (43) that is opened in the connection block (42) near the horizontal shaft (32) one end, is fixed on the horizontal shaft (32) and is close to the connection block (42) One end and a square block (44) inserted into the square groove (43) and a fixing assembly (45) installed on the connection block (42) for fixing the square block (44); the outside of the connection block (42) A T-shaped block (421) is affixed to the wall, and the inner side wall of the give way groove (41) is provided with a T-shaped slot ( 411). 8. A steel strand protection structure for long-span beams according to claim 7, characterized in that: the fixing assembly (45) includes a radial sliding connection along the horizontal axis (32) connected to the connecting block The latch (451) of (42), the block (452) that is sleeved and fixed on the latch (451), the spring (453) that is sleeved on the latch (451) and the jack ( 454); one end of the bolt (451) is set through the connecting block (42) and extends into the square groove (43) to be inserted into the socket (454), and the other end is fixedly connected with a handle (455); the stopper (452) is located between the handle (455) and the connection block (42), and the two ends of the spring (453) are fixedly connected to the connection block (42) and the stopper (452) respectively. 9. A steel strand protection structure for large-span beams according to claim 1, characterized in that: the top of the installation groove (31) is sequentially installed with a plurality of protective covers (8) along its length direction , the bottom of the installation groove (31) is sequentially installed with a plurality of drainage pipes (9) along its length direction, and the end of the drainage pipes (9) away from the installation groove (31) runs through the side of the main beam (11).