A device for continuous preloading of bridges
By designing a device for continuous pre-pressing of bridges in the continuous box girder construction of bridges, the combination of support mechanism and sliding mechanism is used to solve the cumbersome and time-consuming problems of the traditional pre-pressing process, and a fast and accurate pre-pressing effect is achieved.
Patent Information
- Application Number
- CN202510205912.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2025-04-01
AI Technical Summary
In the construction of traditional bridge continuous box girders, the pre-pressing process of cast-in-place brackets is cumbersome and time-consuming, and the pre-pressing of sandbags or water bags is complicated and has low accuracy.
A device for continuous pre-pressing of bridges is designed. By providing a support mechanism and a sliding mechanism on the top of the multi-stage straight box girder bracket, pre-pressing is performed using the box body and sand and gravel of the sliding mechanism, and the rapid movement of the sliding mechanism is achieved through alternating cyclic switching of the support mechanism.
The rapid and accurate continuous pre-pressure of bridges is achieved, reducing manpower and material investment, shortening construction periods, and improving pre-pressure accuracy.
Smart Images
Figure CN119736857A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a device for prestressing a bridge, in particular to a device for continuous prestressing of a bridge. Background Art
[0002] During the construction of continuous box girder bridges, the stability and deformation of the cast-in-place support are key parameters for bridge construction stability and safety. In order to ensure that the support meets the construction technical requirements, it is necessary to test the stability of the support through pre-stressing tests to basically eliminate the inelastic deformation of the support.
[0003] The preloading weight is configured to be 1.2 times the weight of the support bearing after pouring. Observations are carried out after the settlement stabilizes to obtain the elastic and inelastic deformation of the support and foundation under the design constant load, obtain relevant test data, and adjust the support structure in time according to the test data. The traditional preloading method is generally sandbag preloading, which requires a large number of sandbags to be lifted by a crane. This is not only time-consuming and labor-intensive, but also difficult to load and unload due to the lack of a fixed shape of sandbags. Sandbags are prone to collapse when stacked too high. There are also water bags for preloading. Water bag preloading is not only cumbersome and complicated to operate, but also a slight uneven base surface will cause uneven overall water volume, reducing the preloading accuracy.
[0004] The traditional cast-in-place construction of continuous box girder bridges is to pre-press the next section of the cast-in-place bridge support after the pre-pressing of one section is completed. During the continuous pre-pressing process of the straight multi-section bridge support, the sandbags used for pre-pressing need to be continuously lifted and lowered between the pre-pressed and the next bridge support that needs to be pre-pressed by a large crane parked next to the bridge support. The repetitive work consumes a lot of manpower and material resources, takes up a lot of time, and delays the construction period. Summary of the invention
[0005] In order to overcome the shortcomings in the background technology, the present invention discloses a device for continuous prestressing of bridges, by setting a support mechanism A on the top of a formwork frame being prestressed on the top of a multi-section straight box beam support that needs to be continuously prestressed, setting a sliding mechanism on the top of the support mechanism A, and prestressing is performed using a box body provided by the sliding mechanism and sand and gravel arranged in the box body, and setting a support mechanism B connected to the support mechanism A on the top of the next formwork frame to be prestressed, pulling the sliding mechanism to the top of the support mechanism B, thereby achieving the purpose of quickly moving the sliding mechanism.
[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme: A device for continuous preloading of bridges, comprising a support mechanism A, a support mechanism B, a sliding mechanism and a pulley mechanism. The support mechanism A includes a first bottom plate, and guard plates extending upward are provided on both opposite sides of the first bottom plate. Two through slots are respectively provided at intervals on the two guard plates located at the front end of the first bottom plate. The pulley mechanism includes vertical plates, and there are two vertical plates arranged at intervals. A plurality of connecting plates are provided at intervals between the two vertical plates. Between the plurality of connecting plates, a tapered column roller with thick ends and a thin middle is rotatably arranged at intervals. The pulley mechanism is located at the top of the support mechanism A, and both ends of the two vertical plates are respectively clamped in the through slots provided on the two guard plates. The sliding mechanism includes a sliding plate, and a plurality of rotating wheels are arranged at intervals in an array at the bottom of the sliding plate. A plurality of support columns are arranged at intervals in an array at the top of the sliding plate. A plurality of boxes are sleeved on the support columns at intervals. In each box, a cavity with an upper opening is provided. The sliding mechanism is placed between the rear end of the first bottom plate at the top of the first bottom plate and the pulley mechanism. The support mechanism B has the same structure as the support mechanism A. The sliding mechanism can slide between the support mechanism A and the support mechanism B after the first bottom plate provided by the support mechanism A and the second bottom plate provided by the support mechanism B are connected.
[0007] For the device for continuous preloading of bridges, a plurality of "L"-shaped carrying bars are provided at intervals on the tops of the two guard plates.
[0008] For the device for continuous preloading of bridges, connection blocks are provided at both ends of the upper part of each guard plate, and through holes are longitudinally provided on each connection block. The rear end of the second bottom plate provided by the support mechanism B is in contact with the front end of the first bottom plate provided by the support mechanism A. The two connection blocks provided at the rear end of the support mechanism B and the two connection blocks provided at the front end of the support mechanism A are respectively in contact. Connection buckles in a "冂" shape are inserted into the through holes respectively provided on the two contact connection blocks.
[0009] For the device for continuous preloading of bridges, lifting rings A are provided at both ends of the tops of the two vertical plates.
[0010] For the device for continuous preloading of bridges, notches are provided at both ends of the tops of the two vertical plates located on the opposite sides of the tapered column roller.
[0011] For the device for continuous preloading of bridges, shafts are provided at both ends of each tapered column roller, and shaft holes A are provided on the connecting plates at positions corresponding to the shafts. The shafts are rotatably connected in the shaft holes A.
[0012] For the device for continuous preloading of bridges, hanging rings are provided at positions corresponding to the middles of the plurality of tapered column rollers on the top of the sliding plate on one side of the front end of the first bottom plate.
[0013] For the device for continuous preloading of bridges, fixing plates are provided on both sides of each box, through holes are provided on the fixing plates, and the boxes are sleeved on the support columns by means of the through holes.
[0014] The device for continuous prestressing of bridges is provided with a lifting ring B on the top of each box.
[0015] The device for continuous prestressing of bridges is provided with multiple groups of spaced support plates at the bottom of the slide plate, and multiple shaft holes B are relatively provided on each group of support plates. Multiple wheels are rotatably connected in the shaft holes B using wheel axles provided at both ends.
[0016] Due to the adoption of the above technical solution, the present invention has the following beneficial effects: The device for continuous prestressing of bridges described in the present invention is provided with a support mechanism A at the top of a first formwork frame to be prestressed at the top of a multi-section straight box girder support that needs to be continuously prestressed, a pulley mechanism is provided at the front end of the top of the support mechanism A, and a sliding mechanism is provided at the top of the support mechanism A, and the first support is prestressed by using a box provided by the sliding mechanism and sand and gravel provided in the box, and a support mechanism B connected to the support mechanism A is provided at the top of the second formwork frame to be prestressed, the pulley mechanism is hoisted to the front end of the top of the support mechanism B, and the sliding mechanism is pulled to the top of the support mechanism B to prestress the second support, and the support mechanism A is moved to the top of the third formwork frame to be prestressed, and the above steps are repeated to move the sliding mechanism and the pulley mechanism to the top of the support mechanism A again, and the support mechanism A and the support mechanism B are alternately switched at the top of the multi-section straight box girder support that needs to be continuously prestressed, so as to achieve the purpose of quickly moving the sliding mechanism; the present invention has a unique concept and strong practicality, and forms a continuous and rapid prestressing by arranging the prestressing material into an integral structure, and the boxes arranged in an array balance the prestressing force, and also improve the prestressing accuracy, and has research and development and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the cooperation between the support mechanism A and the pulley mechanism of the present invention; Figure 3 It is a structural schematic diagram of the cooperation between the support mechanism A and the pulley mechanism of the present invention from another perspective; Figure 4 It is a structural schematic diagram of the support mechanism A of the present invention; Figure 5 It is a structural schematic diagram of the support mechanism A of the present invention from another perspective; Figure 6 It is a schematic diagram of the internal structure of the pulley mechanism of the present invention; Figure 7 It is a structural schematic diagram of the pulley mechanism of the present invention; Figure 8 It is a structural schematic diagram of the sliding mechanism of the present invention; Fig. 9It is a structural schematic diagram of the front side of the skateboard of the present invention; Fig.10 It is a side view structural schematic diagram of the skateboard of the present invention; Fig.11 It is a structural schematic diagram of the back side of the skateboard of the present invention; Fig.12 A schematic diagram of the side view structure of the skateboard of the present invention from another perspective; Fig.13 It is a structural schematic diagram of the box body of the present invention; Fig.14 It is a structural schematic diagram of the connecting buckle of the present invention; Fig.15 It is a schematic diagram of the structure when the present invention is used; Fig.16 This is a schematic diagram of the structure of the support mechanism A, the pulley mechanism and the sliding mechanism when the present invention is used; Fig.17 This is a schematic diagram of the structure of the support mechanism A and the support mechanism B connected and coordinated with the pulley mechanism and the sliding mechanism when the present invention is used; Fig.18 This is a structural schematic diagram of the present invention in which the pulley mechanism is located on the top of the support mechanism B and the sliding mechanism is located on the top of the support mechanism A after the support mechanism A and the support mechanism B are connected when the present invention is used; Fig.19 This is a structural schematic diagram of the present invention in which the pulley mechanism is located at the top of the support mechanism B after the support mechanism A and the support mechanism B are connected, and the sliding mechanism moves from the top of the support mechanism A to the top of the support mechanism B under the pulling of the cable; Fig. 20 This is a structural schematic diagram of the present invention in which the pulley mechanism is located on the top of the support mechanism B after the support mechanism A and the support mechanism B are connected, and the sliding mechanism is located on the top of the support mechanism B under the pulling of the cable.
[0018] In the figure: 1. "L"-shaped shoulder bar; 2. box body; 3. support column; 4. slide plate; 5. rotating wheel; 6. first bottom plate; 7. cone-shaped roller; 8. vertical plate; 9. connecting plate; 10. guard plate; 11. connecting block; 12. perforation; 13. lifting ring A; 14. notch; 15. shaft body; 16. shaft hole A; 17. hanging ring; 18. cavity; 19. fixing plate; 20. lifting ring B; 21. supporting plate; 22. wheel axle; 23. through hole; 24. through groove; 25. front end of first bottom plate; 26. shaft hole B; 27. connecting buckle; 28. template; 29. frame; 30. sand and gravel; 31. second bottom plate; 32. cable. DETAILED DESCRIPTION
[0019] The present invention can be explained in more detail by the following examples, the present invention is not limited to the following examples, and the purpose of disclosing the present invention is to protect all changes and improvements within the scope of the present invention; Combined with the attached Figures 1 to 14 The device for continuous preloading of bridges includes a support mechanism A, a support mechanism B, a sliding mechanism, and a pulley mechanism. The support mechanism A includes a first bottom plate 6. On both opposite sides of the first bottom plate 6, there are upwardly extending guard plates 10. On the two guard plates 10 at the front end 25 of the first bottom plate, there are respectively two through slots 24 spaced apart. On the tops of the two guard plates 10, there are multiple "L"-shaped bearers 1 spaced apart. The pulley mechanism includes vertical plates 8. There are two vertical plates 8 spaced apart. Between the two vertical plates 8, there are multiple connecting plates 9 spaced apart. At both ends of each conical roller 7, there is a shaft body 15. At the positions of the connecting plates 9 corresponding to the shaft body 15, there are shaft holes A16. The shaft body 15 is rotatably connected in the shaft hole A16. Between the multiple connecting plates 9, there is a conical roller 7 with thick ends and a thin middle part rotatably arranged. At the tops of the two vertical plates 8 on the opposite sides of the conical roller 7, there are notches 14. At both ends of the tops of the two vertical plates 8, there are hanging rings A13. The pulley mechanism is located on the top of the support mechanism A and the two ends of the two vertical plates 8 are respectively clamped in the through slots 24 provided on the two guard plates 10. The sliding mechanism includes a sliding plate 4. At the bottom of the sliding plate 4, there are multiple groups of support plates 21 spaced apart. On each group of support plates 21, there are multiple shaft holes B26 provided opposite to each other. Multiple rotating wheels 5 are respectively rotatably connected in the shaft holes B26 by the wheel shafts 22 provided at both ends. On the top of the sliding plate 4, there are multiple support columns 3 arranged at intervals in an array. On the support columns 3, there are multiple boxes 2 sleeved at intervals in an array. In each box 2, there is an upper-opening cavity 18. On both sides of each box 2, there are fixing plates 19. On the fixing plates 19, there are through holes 23. The box 2 is sleeved on the support column 3 by the through holes 23. On the top of each box 2, there is a hanging ring B20. The sliding mechanism is placed between the rear end of the first bottom plate 6 of the support mechanism A and the pulley mechanism on the top of the first bottom plate 6. The support mechanism B and the support mechanism A have the same structure. The sliding mechanism can slide between the support mechanism A and the support mechanism B after the first bottom plate 6 of the support mechanism A and the second bottom plate 31 of the support mechanism B are connected. At both ends of the upper part of each guard plate 10, there are connecting blocks 11. On each connecting block 11, there is a longitudinal through hole 12. The rear end of the second bottom plate 31 of the support mechanism B is in contact with the front end 25 of the first bottom plate of the support mechanism A. The two connecting blocks 11 provided at the rear end of the support mechanism B and the two connecting blocks 11 provided at the front end of the support mechanism A are respectively in contact. In the through holes 12 respectively provided on the two contacting connecting blocks 11, a "冂"-shaped connecting buckle 27 is inserted. On the top of the sliding plate 4 on one side of the front end 25 of the first bottom plate, hanging rings 17 are provided at positions corresponding to the middle parts of the multiple conical rollers 7.
[0020] Implement the device for continuous preloading of bridges described in the present invention, combined with the attached Fig.15, a framework 29 is set at the bottom of the first box girder to be cast in place. A formwork 28 is laid on the top of the framework 29, and a supporting mechanism A, a supporting mechanism B, a pulley mechanism and a sliding mechanism that match the box girder to be cast in place in size are fabricated. The self-weights of the supporting mechanism A, the supporting mechanism B, the pulley mechanism and the sliding mechanism are measured. The crane hook is used to hook multiple "L"-shaped bearers 1 provided by the supporting mechanism A, and the supporting mechanism A is placed on the top of the formwork 28. The crane hook is used to hook the lifting ring A13, and the two ends of the two vertical plates 8 of the pulley mechanism are respectively clamped in the through grooves 24 provided by the two guard plates 10 so that the pulley mechanism is located on the top of the supporting mechanism A. The sling of the crane is used to hold the sliding plate 4, and the sliding plate 4 is placed on the top of the supporting mechanism A. The crane hook is used to hook the lifting ring B20 to lift multiple boxes 2 to the top of the sliding plate 4, so that the through holes 23 provided by each box 2 are sleeved on the support columns 3. According to the preloading tonnage requirement, the weight of the sand and gravel 30 to be placed in each cavity 18 is calculated, combined with the attachment Fig.16 , the sand and gravel 30 to be placed is lifted into each cavity 18 by a crane, and the preloading of the first box girder to be cast in place is started; Combined with the attachment Fig.17 , another set of framework 29 is set at the bottom of the adjacent second box girder to be cast in place. Another set of formwork 28 is laid on the top of the framework 29. The crane hook is used to hook multiple "L"-shaped bearers 1 provided by the supporting mechanism B, and the supporting mechanism B is placed on the top of the other set of formwork 28, so that the rear end of the second bottom plate 31 of the supporting mechanism B is in contact with the front end of the first bottom plate 25 of the supporting mechanism A. The two connecting blocks 11 provided at the rear end of the supporting mechanism B and the two connecting blocks 11 provided at the front end of the supporting mechanism A are respectively in contact. A connecting buckle 27 in a "冂"-shaped structure is inserted into the through holes 12 respectively provided on the two contacting connecting blocks 11 to connect the supporting mechanism B and the supporting mechanism A. Combined with the attachment Fig.18 , the pulley mechanism is lifted out from the top of the supporting mechanism A and lifted to the top of the supporting mechanism B, so that the two ends of the two vertical plates 8 of the pulley mechanism are respectively clamped in the through grooves 24 provided by the supporting mechanism B. Combined with the attachment Fig.19 , one to three winches are set on the ground in front of the second box girder to be cast in place according to the traction weight requirement, and the winches are connected to the power supply. The end of the cable 32 of the winch is hooked to the hanging ring 17, and the cable 32 is placed on the conical column roller 7 of the pulley mechanism on the top of the supporting mechanism B. The conical column roller 7 with thick ends and a thin middle effectively prevents the cable 32 from being easily deflected when pulling the sliding mechanism. The winch is started, and the sliding mechanism is moved from the supporting mechanism A to the supporting mechanism B. The multiple rotating wheels 5 arranged at intervals at the bottom of the sliding plate 4 ensure the load-bearing capacity of the sliding plate 4. Combined with the attachment Fig. 20, until the sliding mechanism is completely placed on the top of the supporting mechanism B, remove the cable 32, take out the connecting buckle 27 between the supporting mechanism A and the supporting mechanism B, lift the supporting mechanism A from the top of the first section of the box girder template 28 to be cast in situ, and start pre-pressing the second section of the box girder to be cast in situ (because the box girders to be continuously cast in situ have the same length and weight, and are all in a straight state, so the pre-pressing weight of the second section of the box girder to be cast in situ is the same as that of the first section); Build the bracket 29 of the third section of the cast-in-place box girder and lay the formwork 28. After the pre-stressing of the second section of the cast-in-place box girder is completed, hoist the support mechanism A to the top of the formwork 28 of the third section of the cast-in-place box girder, and insert the connecting buckle 27 between the connecting blocks 11 respectively arranged at the front end of the support mechanism B and the rear end of the support mechanism A. According to the above method, place the pulley mechanism on the top of the support mechanism A at the top of the formwork 28 of the third section of the cast-in-place box girder, and use a winch to pull the sliding mechanism from the top of the support mechanism B to the top of the support mechanism A. In the subsequent pre-stressing process, the above steps are continuously repeated to use the support mechanism A and the support mechanism B to move forward alternately and cyclically, so as to achieve the purpose of quickly moving the sliding mechanism.
[0021] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The mechanical parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.
[0022] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the protection scope of the present invention.
Claims
1. A device for continuous preloading of bridges, characterized by: It includes a support mechanism A, a support mechanism B, a sliding mechanism and a pulley mechanism. The support mechanism A includes a first bottom plate (6). On both opposite sides of the first bottom plate (6), there are upwardly extending guard plates (10). On the two guard plates (10) at the front end (25) of the first bottom plate, there are respectively two through slots (24) arranged at intervals. The pulley mechanism includes vertical plates (8). There are two vertical plates (8) arranged at intervals. Between the two vertical plates (8), there are multiple connecting plates (9) arranged at intervals. Between the multiple connecting plates (9), there are conical column rollers (7) with thick ends and thin middle parts rotatably arranged at intervals. The pulley mechanism is located at the top of the support mechanism A and the two ends of the two vertical plates (8) are respectively clamped in the through slots (24) provided on the two guard plates (10). The sliding mechanism includes a sliding plate (4). At the bottom of the sliding plate (4), there are multiple runners (5) arranged at intervals in an array. At the top of the sliding plate (4), there are multiple support columns (3) arranged at intervals in an array. On the support columns (3), there are multiple boxes (2) sleeved at intervals in an array. In each box (2), there is an upper-opening cavity (18). The sliding mechanism is placed between the rear end of the first bottom plate (6) at the top of the first bottom plate (6) and the pulley mechanism. The support mechanism B has the same structure as the support mechanism A. The sliding mechanism can slide between the support mechanism A and the support mechanism B after the first bottom plate (6) of the support mechanism A and the second bottom plate (31) of the support mechanism B are connected.
2. The device for continuous preloading of bridges according to claim 1 is characterized in that: At the top of the two guard plates (10), there are multiple "L"-shaped bearers (1) arranged at intervals.
3. The device for continuous preloading of bridges according to claim 1 is characterized in that: At both ends of the upper part of each guard plate (10), there are connecting blocks (11). On each connecting block (11), there is a longitudinal through hole (12). The rear end of the second bottom plate (31) of the support mechanism B is in contact with the front end (25) of the first bottom plate of the support mechanism A. The two connecting blocks (11) provided at the rear end of the support mechanism B and the two connecting blocks (11) provided at the front end of the support mechanism A are respectively in contact. A "冂"-shaped connecting buckle (27) is inserted into the through holes (12) respectively provided on the two contacting connecting blocks (11).
4. The device for continuous preloading of bridges according to claim 1 is characterized in that: At both ends of the top of the two vertical plates (8), there are hanging rings A (13).
5. The device for continuous preloading of bridges according to claim 1 is characterized in that: At the top of the two vertical plates (8) on the opposite sides of the conical column roller (7), there are notches (14).
6. The device for continuous preloading of bridges according to claim 1 is characterized in that: At both ends of each conical column roller (7), there is a shaft body (15). At the positions corresponding to the shaft body (15) on the connecting plate (9), there are shaft holes A (16). The shaft body (15) is rotatably connected in the shaft hole A (16).
7. The device for continuous preloading of bridges according to claim 1 is characterized in that: On the top of the sliding plate (4) on one side of the front end (25) of the first bottom plate, there are hanging rings (17) arranged at positions corresponding to the middle parts of the multiple conical column rollers (7).
8. The device for continuous preloading of bridges according to claim 1 is characterized in that: On both sides of each box (2), there are fixing plates (19). On the fixing plates (19), there are through holes (23). The box (2) is sleeved on the support column (3) by means of the through holes (23).
9. The device for continuous preloading of bridges according to claim 1 is characterized in that: At the top of each box (2), there is a hanging ring B (20).
10. The device for continuous preloading of bridges according to claim 1, characterized in that: A plurality of groups of support plates (21) are arranged at intervals at the bottom of the slide plate (4), and a plurality of shaft holes B (26) are arranged on each group of support plates (21) in a relative manner. The plurality of rotating wheels (5) are rotatably connected in the shaft holes B (26) by means of wheel axles (22) respectively arranged at both ends thereof.