External prestressed steel beam steering device of continuous box girder bridge

Abstract

The utility model relates to the technical field of steel beam steering, and discloses an external prestress steel beam steering device of a continuous box girder bridge, which comprises a positioning component, a middle reinforcing steel structure and side reinforcing steel structures symmetrically arranged on two sides of the middle reinforcing steel structure. The steering auxiliary mechanism is arranged between the side reinforcing steel structure and the middle reinforcing steel structure and is matched with the prestressed steel beam; when the steel beam guide assembly is installed, the two positioning steel sleeves are moved and folded in the direction close to the steel beam guide wheel, then positioning pin insertion holes which are formed in the end faces of the side reinforcing steel structures and the end faces of the middle reinforcing steel structures and matched with the six-edge insertion pipes are found, and then a prestressed steel beam is steered through the steel beam guide wheel. The problems that on one hand, a steering shaft of an existing steering device is not easy to assemble on a steel structure, on the other hand, the steering shaft is prone to abrasion in the steering process of a steel bundle, and the whole device is a rigid component with the set size and is poor in use flexibility are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel strand steering, and specifically relates to an external prestressed steel strand steering device for a continuous box girder bridge. Background Technique

[0002] At present, the external prestressed steering devices for continuous box girder bridges mostly adopt the forms of concrete steering blocks, steel truss steering devices, and combinations of the two. The concrete steering block is mainly formed by implanting steel bars in the beam body, configuring the steel bars of the steering block, then pouring concrete from the top plate of the box girder, erecting formwork for pouring, and forming the concrete steering block after the curing period. The steel truss steering device is mainly processed into components in the factory, and then the components are assembled on site through implanted steel bars and gusset plates to form the steel truss steering device.

[0003] After retrieval, CN 212533771U discloses an external prestressed steel strand steering device for a continuous box girder bridge, which includes a support frame, a steering shaft and an external prestressed steel strand. The support frame is connected to the inner wall of the box chamber of the box girder bridge. The steering shaft is fixedly connected to the support frame. The external prestressed steel strand is wound around the steering shaft circumferentially. Among them, the support frame includes a transverse steel plate, a first limiting stiffening steel plate and a side anchoring plate. The transverse steel plate is arranged at the bottom of the beam body of the box girder bridge. The first limiting stiffening steel plate is arranged on both sides of the transverse steel plate and is connected to the inner wall of the box chamber of the box girder bridge for restricting the displacement of the external prestressed steel strand. The side anchoring plate is arranged between the first limiting stiffening steel plate and the beam body of the box girder bridge for fixing the first limiting stiffening steel plate. The steering shaft is arranged between the transverse steel plate and the first limiting stiffening steel plate. The utility model can solve the problems of difficult construction of traditional external prestressed concrete steering devices, increased self-weight, and difficult assembly of steel truss steering devices.

[0004] However, through the exploration of the inventor, it is found that this technical solution still has at least the following defects:

[0005] 1. In the process of actually using this steering device, it is found that since the steering shaft is a steel bar, on the one hand, it is not easy to be assembled on the steel structure, and moreover, this device uses a steel bar as the rotating shaft, which is prone to wear during the steering process of the external prestressed steel strand, and the flexibility is also low;

[0006] 2. The overall structure of this device is a rigid member with a set size, and the installation and use length of the positioning connecting piece cannot be adjusted according to specific construction requirements during use, and the flexibility during use is poor.

[0007] In view of this, the utility model proposes a new external prestressed steel strand steering device for a continuous box girder bridge to solve the problems existing in the above-mentioned prior art. Content of the Utility Model

[0008] (1) Technical Problems to be Solved

[0009] The purpose of the present utility model is to provide a deviating device for external prestressed steel tendons of a continuous box girder bridge, so as to solve the problems raised in the above-mentioned background technology: in actual use, during the process of the traditional deviating device, it is found that since the deviating shaft is made of steel bars, on the one hand, it is not easy to be assembled on the steel structure, and on the other hand, as a rotating shaft, the steel bars are prone to wear during the deviating process of the external prestressed steel tendons, and the flexibility is relatively low; the overall structure of the traditional deviating device is a rigid component with a set size, and the installation and use length of the positioning connecting piece cannot be adjusted according to specific construction requirements during use, and the flexibility during use is poor, etc.

[0010] (II) Technical solution

[0011] To achieve the purpose of flexible adjustment and installation and good deviating effect of the external prestressed steel tendons, the basic concept of the technical solution adopted by the present utility model is:

[0012] A deviating device for external prestressed steel tendons of a continuous box girder bridge, comprising: a positioning assembly, including a middle reinforcing steel structure and side reinforcing steel structures symmetrically arranged on both sides of the middle reinforcing steel structure, and both the side reinforcing steel structures and the middle reinforcing steel structure are installed on the box girder bridge; a deviating auxiliary mechanism, arranged between the side reinforcing steel structure and the middle reinforcing steel structure and adapted to the prestressed steel tendons.

[0013] Based on the above technical features: through the arrangement of the side reinforcing steel structure, the deviating auxiliary mechanism and the middle reinforcing steel structure, a tying system is formed to tie and fix the two side plates of the box girder bridge to enhance the bearing capacity of the box girder bridge when stressed; the deviating auxiliary mechanism can guide and limit the prestressed steel tendons.

[0014] As a preferred scheme of the deviating device for external prestressed steel tendons of a continuous box girder bridge described in the present utility model:

[0015] The deviating auxiliary mechanism includes a steel tendon guiding wheel, which is rotatably sleeved on a shaft rod through a bearing and is adapted to the prestressed steel tendons; the shaft rod is arranged between the side reinforcing steel structure and the middle reinforcing steel structure and is connected to the side reinforcing steel structure and the middle reinforcing steel structure through positioning connecting pieces; the positioning connecting pieces are respectively embedded in the side reinforcing steel structure and the middle reinforcing steel structure and are connected to the shaft rod through limit bolts.

[0016] Based on the above technical features: the side reinforcing steel structure and the middle reinforcing steel structure can be quickly connected through the shaft rod and the positioning connecting pieces, and the prestressed steel tendons can be steered, guided and limited through the steel tendon guiding wheel.

[0017] As a preferred scheme of the deviating device for external prestressed steel tendons of a continuous box girder bridge described in the present utility model:

[0018] The positioning connecting piece includes a hexagonal socket pipe, which is installed in the bolt positioning jacks on the side strengthening steel structure and the middle strengthening steel structure through positioning bolts; a positioning steel sleeve, which is movably arranged outside the hexagonal socket pipe through a spring, and a screw hole is arranged on the positioning steel sleeve to match the limit bolt.

[0019] Based on the above technical features: When installing the steel strand guiding assembly, move the two positioning steel sleeves close to each other in the direction of the steel strand guiding wheel, and then find the positioning pin jacks opened on the end faces of the side strengthening steel structure and the middle strengthening steel structure and adapted to the hexagonal socket pipe; then, after aligning a certain hole on the shaft rod with the screw hole on the positioning steel sleeve, use the limit bolt for limiting, and then the prestressed steel strand can be turned through the steel strand guiding wheel, solving the problems in the actual use of the existing steering device. Since the steering shaft is a steel bar, on the one hand, it is not easy to assemble on the steel structure, and on the other hand, as the rotating shaft, the steel bar will be worn during the turning process of the external prestressed steel strand, and the flexibility is also relatively low.

[0020] As a preferred solution of the external prestressed steel strand steering device for a continuous box girder bridge described in the present invention:

[0021] The limit bolt is also adapted to the jack arranged at the end of the shaft rod.

[0022] Based on the above technical features: The shaft rod and the positioning connecting piece can be quickly connected by using the limit bolt during the installation process, realizing the quick installation of the device.

[0023] As a preferred solution of the external prestressed steel strand steering device for a continuous box girder bridge described in the present invention:

[0024] The positioning connecting piece further includes a first adjusting bolt, which is threadedly connected to the positioning steel sleeve and adapted to the hexagonal socket pipe; a second adjusting bolt, which is screwed into the first adjusting bolt and threadedly connected to the hexagonal socket pipe.

[0025] Based on the above technical features: By rotating the first adjusting bolt to overcome the elastic force of the spring, the relative position relationship between the positioning steel sleeve and the hexagonal socket pipe can be adjusted. After the position relationship is adjusted, in order to ensure the stability of the overall device when prestressing the steel strand, rotate the second adjusting bolt again to make it threadedly connected to the hexagonal socket pipe to complete the fixation of the position of the positioning steel sleeve.

[0026] As a preferred solution of the external prestressed steel strand steering device for a continuous box girder bridge described in the present invention:

[0027] The screwing direction of the external thread of the first adjusting bolt is the same as that of the external thread of the second adjusting bolt.

[0028] Based on the above technical features: After completing the tightening adjustment of the first adjusting bolt, the second adjusting bolt can be rotated again to be threadedly connected with the hexagonal socket pipe, thereby completing the fixation of the position of the positioning steel sleeve.

[0029] As a preferred solution of the external prestressed steel tendon steering device for a continuous box girder bridge described in the present utility model:

[0030] Both the side strengthening steel structure and the middle strengthening steel structure are fixed to the box girder bridge by bolts.

[0031] Based on the above technical features: The rapid installation of the present device in the box girder bridge can be completed.

[0032] (III) Beneficial effects

[0033] Compared with the prior art, the present utility model provides an external prestressed steel tendon steering device for a continuous box girder bridge, which has the following beneficial effects:

[0034] 1. Through the setting of the positioning component, during use, a pulling system is formed through the setting of the side strengthening steel structure, the steering auxiliary mechanism and the middle strengthening steel structure, and the two side plates of the box girder bridge are pulled and fixed, which can effectively enhance the bearing capacity of the box girder bridge when stressed and prevent the deformation of the box girder bridge;

[0035] 2. Through the setting of the positioning connecting piece, when installing the steel tendon guiding component, the two positioning steel sleeves are moved close to each other in the direction of the steel tendon guiding wheel, and then the positioning pin insertion holes adapted to the hexagonal socket pipe opened on the end faces of the side strengthening steel structure and the middle strengthening steel structure are found; then after the shaft rod corresponds to the screw holes on the positioning steel sleeve, the limit bolt is used for limiting, and then the prestressed steel tendon can be steered through the steel tendon guiding wheel, solving the problems that in actual use of the existing steering device, since the steering shaft is a steel bar, on the one hand, it is not easy to assemble on the steel structure, and on the other hand, the steel bar as the rotating shaft is worn during the steering process of the external prestressed steel tendon, and the flexibility is also low;

[0036] 3. Through the setting of the spring, the first adjusting bolt and the second adjusting bolt, the use length of the positioning connecting piece is adjustable to meet the requirements of different construction conditions, solving the problem that the existing steering device cannot adjust the installation and use length of the positioning connecting piece according to specific construction requirements during use, and the flexibility is poor during use; achieving the purpose of flexible adjustment and installation and good external prestressed steel tendon steering effect. Description of the drawings

[0037] Figure 1 It is the installation effect diagram of the external prestressed steel tendon steering device for the continuous box girder bridge of the present utility model;

[0038] Figure 2It is a partial enlarged view of the external prestressed steel tendon steering device at location A of the continuous box girder bridge of the present utility model;

[0039] Figure 3 It is a partial enlarged view of the external prestressed steel tendon steering device at location B of the continuous box girder bridge of the present utility model;

[0040] Figure 4 It is a partial enlarged view of the external prestressed steel tendon steering device at location C of the continuous box girder bridge of the present utility model;

[0041] Figure 5 It is a structural schematic diagram of the positioning connecting piece of the present utility model;

[0042] Figure 6 It is a structural schematic diagram of the hexagonal insertion tube of the present utility model.

[0043] In the figure: 1. Box girder bridge; 2. Side strengthening steel structure; 3. Intermediate strengthening steel structure; 4. Steel tendon guide wheel; 5. Prestressed steel tendon; 6. Shaft rod; 7. Limit bolt; 8. Positioning steel sleeve; 9. Hexagonal insertion tube; 10. Screw hole; 11. Spring; 12. First adjusting bolt; 13. Second adjusting bolt. Specific implementation manners

[0044] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model.

[0045] Embodiment 1: Please refer to Figures 1-6 , a solution provided by the present utility model:

[0046] An external prestressed steel tendon steering device for a continuous box girder bridge, comprising:

[0047] A positioning assembly, the positioning assembly includes two side strengthening steel structures 2 fixedly installed on the box girder bridge 1 and a single intermediate strengthening steel structure 3. The side strengthening steel structures 2 are symmetrically arranged on both sides of the intermediate strengthening steel structure 3, and the two side strengthening steel structures 2 and the single intermediate strengthening steel structure 3 are fixedly connected to the box girder bridge 1 through bolt members;

[0048] Steering auxiliary mechanisms, two in number, and are respectively arranged in the gaps between the two side strengthening steel structures 2 and the single intermediate strengthening steel structure 3, connecting the side strengthening steel structures 2 and the intermediate strengthening steel structure 3, and cooperating with the prestressed steel tendon 5 to guide and limit the prestressed steel tendon 5;

[0049] Specifically, during use, through the settings of the side strengthening steel structure 2, the steering assist mechanism, and the middle strengthening steel structure 3, a tie system is formed to pull and fix the two side plates of the box girder bridge 1, so as to enhance the bearing capacity of the box girder bridge 1 when stressed; the steering assist mechanism can guide and limit the prestressed steel bundle 5.

[0050] Embodiment 2: As Figure 1 , Figure 2 and Figure 3 shown, in the specific implementation, the steering assist mechanism includes

[0051] a steel bundle guide wheel 4, which is rotatably sleeved on a shaft rod 6 through a bearing and is used in cooperation with the prestressed steel bundle 5;

[0052] a shaft rod 6, which is arranged between the side strengthening steel structure 2 and the middle strengthening steel structure 3 and is connected to the side strengthening steel structure 2 and the middle strengthening steel structure 3 through a positioning connecting piece;

[0053] a positioning connecting piece, which is respectively embedded in the side strengthening steel structure 2 and the middle strengthening steel structure 3 and is connected to the shaft rod 6 through a limit bolt 7;

[0054] Specifically, during use, when installing the steel bundle guiding assembly, move the positioning steel sleeves 8 on the two positioning connecting pieces closer to the steel bundle guide wheel 4 to close them, and then find the bolt positioning insertion holes opened on the end faces of the side strengthening steel structure 2 and the middle strengthening steel structure 3 that are adapted to the hexagonal insertion tube 9, and then connect the positioning connecting piece to the side strengthening steel structure 2 and the middle strengthening steel structure 3; then, after a certain hole on the shaft rod 6 corresponds to the screw hole 10 on the positioning steel sleeve 8, use the limit bolt 7 for limiting, that is, complete the installation of the steel bundle guiding assembly; then the prestressed steel bundle 5 can be steered through the steel bundle guide wheel 4.

[0055] Embodiment 3: As Figure 3 , Figure 4 , Figure 5 and Figure 6 shown, in the specific implementation, the positioning connecting piece includes

[0056] a hexagonal insertion tube 9, which is installed in the bolt positioning insertion holes on the side strengthening steel structure 2 and the middle strengthening steel structure 3 through positioning bolts;

[0057] a positioning steel sleeve 8, which is movably installed on the outer end of the hexagonal insertion tube 9 through a spring 11, and a screw hole 10 is provided on the positioning steel sleeve 8 for use in cooperation with the limit bolt 7, and the positioning steel sleeve 8 is connected to the shaft rod 6 through the limit bolt 7;

[0058] Specifically, during use, first find the bolt positioning jacks opened on the end faces of the side strengthening steel structure 2 and the middle strengthening steel structure 3 that are adapted to the hexagonal insertion tube 9, and install the hexagonal insertion tube 9 on the side strengthening steel structure 2 and the middle strengthening steel structure 3; then move the positioning steel sleeves 8 on the two positioning connectors closer to the steel strand guiding wheel 4 according to the installation requirements and connect them with the limit bolts 7. The spring 11 plays a role in buffering and resetting. Moreover, the outer shape of the hexagonal insertion tube 9 is a rhombus structure, which can prevent the positioning steel sleeve 8 from coaxial rotation when adjusting the rotation of the steel strand guiding wheel 4 and ensure the adjustment accuracy.

[0059] As a preferred implementation, the positioning connector further includes

[0060] a first adjusting bolt 12, which is threadedly connected to the positioning steel sleeve 8 and used in cooperation with the hexagonal insertion tube 9, and abuts against the limit disc of the hexagonal insertion tube 9;

[0061] a second adjusting bolt 13, which is screwed and installed inside the first adjusting bolt 12 and threadedly connected to the hexagonal insertion tube 9; the tightening direction of the external thread of the first adjusting bolt 12 is the same as that of the external thread of the second adjusting bolt 13;

[0062] Specifically, during use, by rotating the first adjusting bolt 12 to overcome the elastic force of the spring 11, the relative position relationship between the positioning steel sleeve 8 and the hexagonal insertion tube 9 is adjusted. After the position relationship adjustment is completed, to ensure the stability of the overall device when dealing with the prestressed steel strand 5, rotate the second adjusting bolt 13 again to make it threadedly connected to the hexagonal insertion tube 9 to complete the fixation of the position of the positioning steel sleeve 8.

[0063] The implementation principle of the external prestressed steel strand steering device for the continuous box girder bridge of the present utility model is as follows:

[0064] During the actual operation process, first fix the two side strengthening steel structures 2 and the single middle strengthening steel structure 3 on the bolts that have been riveted on the box girder bridge 1 through nuts. When installing the steel strand guiding assembly, move the two positioning steel sleeves 8 closer to the steel strand guiding wheel 4 and close them. Then find the positioning pin jacks opened on the end faces of the side strengthening steel structure 2 and the middle strengthening steel structure 3 that are adapted to the hexagonal insertion tube 9. Then, after aligning a certain hole on the shaft rod 6 with the screw hole 10 on the positioning steel sleeve 8, use the limit bolt 7 for limiting. Then the prestressed steel strand 5 can be steered through the steel strand guiding wheel 4.

[0065] In the present utility model, unless otherwise clearly stipulated and defined, the first feature being “above” or “below” the second feature may include the direct contact between the first and second features, or may also include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being “above”, “over” and “on top of” the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being “under”, “beneath” and “underneath” the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature. The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not restricted by the above-mentioned embodiments. The above-mentioned embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will also have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An external prestressed steel strand steering device for a continuous box girder bridge, characterized in that: include: A positioning assembly, comprising a middle reinforcement steel structure (3), and side reinforcement steel structures (2) symmetrically arranged on both sides of the middle reinforcement steel structure (3), wherein the side reinforcement steel structures (2) and the middle reinforcement steel structure (3) are both installed on the box girder bridge (1); The steering auxiliary mechanism is arranged between the side reinforcement steel structure (2) and the middle reinforcement steel structure (3), and is adapted to the prestressed steel bundle (5).

2. The external prestressed steel strand steering device of a continuous box girder bridge according to claim 1, characterized in that: The steering assist mechanism includes The steel bundle guide wheel (4) is rotatably mounted on the shaft (6) through a bearing and is adapted to the prestressed steel bundle (5); A shaft rod (6) is arranged between the side reinforcement steel structure (2) and the middle reinforcement steel structure (3), and is connected to the side reinforcement steel structure (2) and the middle reinforcement steel structure (3) through a positioning connector; The positioning connecting parts are respectively embedded in the side reinforcing steel structure (2) and the middle reinforcing steel structure (3), and are connected to the shaft rod (6) via limiting bolts (7).

3. The external prestressed steel strand steering device for a continuous box girder bridge according to claim 2, characterized in that: The positioning connector includes The hexagonal insert (9) is installed in the bolt positioning holes on the side reinforcement steel structure (2) and the middle reinforcement steel structure (3) through positioning bolts; The positioning steel sleeve (8) is movably arranged on the outside of the hexagonal insert (9) through a spring (11), and a screw hole (10) is arranged on the positioning steel sleeve (8) to match the limiting bolt (7).

4. The external prestressed steel strand steering device for a continuous box girder bridge according to claim 3, characterized in that: The limiting bolt (7) is also adapted to the insertion hole provided at the end of the shaft rod (6).

5. The external prestressed steel strand steering device for a continuous box girder bridge according to claim 3, characterized in that: The positioning connector also includes The first adjusting bolt (12) is threadedly connected to the positioning steel sleeve (8) and is adapted to the hexagonal insert (9); The second adjusting bolt (13) is threadedly installed in the first adjusting bolt (12) and is threadedly connected to the hexagonal insert (9).

6. The external prestressed steel strand steering device for a continuous box girder bridge according to claim 5, characterized in that: The tightening direction of the outer thread of the first adjusting bolt (12) is the same as the tightening direction of the outer thread of the second adjusting bolt (13).

7. The external prestressed steel strand steering device for a continuous box girder bridge according to claim 1, characterized in that: The side reinforcement steel structure (2) and the middle reinforcement steel structure (3) are fixed to the box girder bridge (1) by means of bolts.

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