A falling-prevention type door hole support device for cast-in-place construction of a box girder and a method thereof

Abstract

The present application relates to the box girder cast-in-place construction technical field, more specifically, the present application provides a kind of for box girder cast-in-place construction anti-falling door hole support device and method thereof.The present application can realize the automatic ordering, buffer and single transmission of pin by the cooperation of vibration nail feeder, rivet conveying frame, buffer and nail feeder, without manually placing pin one by one, which greatly improves production efficiency;Using the first driving element to drive the nail plate to send the pin to the preloading position, and then driving the rivet rod to stamp by the second driving element, both realize sequential control through operation control valve, avoid misoperation, ensure that each pin is accurately pressed into workpiece.Carrying member, material seat, buffer and other components are integrated on the bottom plate, the overall volume is small, suitable for pin riveting of small parts.

Description

Technical Field

[0001] This invention relates to the field of cast-in-place box girder construction technology, and more specifically, to a fall-prevention portal frame device and method for cast-in-place box girder construction. Background Technology

[0002] When constructing cast-in-place box girders on existing roads, it is usually necessary to erect portal scaffolding to ensure uninterrupted traffic flow below. Existing portal scaffolding structures typically include steel pipe piles arranged transversely along the road, load-bearing beams arranged longitudinally or obliquely, and a distribution beam and formwork system at the top. The load-bearing beams (especially the second load-bearing beam that intersects the road obliquely) need to be precisely erected on top of the first load-bearing beam at the top of the steel pipe piles.

[0003] Because cast-in-place box girders often intersect existing roads at an oblique angle, the second load-bearing beam intersects with the first load-bearing beam at an inclined angle. During the hoisting and erection process, operators need to repeatedly adjust the horizontal angle and landing position of the second load-bearing beam to ensure that both ends accurately fall into the pre-set support grooves or positions on the first load-bearing beam. This process requires extremely high hoisting precision and usually necessitates multiple lifting, fine-tuning, and trial lowering operations. This not only consumes a lot of time and manpower but also easily leads to component collisions or safety accidents due to improper operation.

[0004] While existing technologies employ guide plates or limiting blocks for assisted positioning, these methods only achieve rough alignment and cannot automatically correct angular deviations and lock the second load-bearing beam during its descent, still requiring manual intervention. Therefore, there is an urgent need for a portal frame support device capable of automatically adapting to the oblique angle and achieving self-centering and self-locking during hoisting, in order to improve erection efficiency and construction safety. Summary of the Invention

[0005] The present invention aims to provide a fall-proof portal frame device and method for cast-in-place box girder construction, in order to solve the technical problems in the prior art of repeatedly adjusting the hoisting angle, difficulty in alignment, low construction efficiency, and lack of automatic locking and integrated fall-proof structure when erecting the second load-bearing beam under the condition of oblique intersection of bridge and road.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fall-proof portal support device for cast-in-place box girder construction, comprising multiple sets of concrete strip foundations constructed at predetermined locations on existing roads, steel pipe piles along the concrete strip foundations, portal passages formed between the multiple sets of steel pipe piles, and a first load-bearing beam extending laterally installed on the top of each set of steel pipe piles. Multiple rotating self-locking components are installed on the upper surface of the first load-bearing beam, and the multiple rotating self-locking components are arranged at intervals along the longitudinal direction; and the multiple rotating self-locking components at corresponding positions above each of the first load-bearing beams form a group. And a second load-bearing beam spanning the same set of rotating self-locking components, the second load-bearing beam being inclinedly intersecting the first load-bearing beam.

[0007] A further technical solution of this application: The rotating self-locking assembly includes a rotating part and a locking part. The rotating part is rotatably connected to the first load-bearing beam, and the locking part is installed on the rotating part. When the locking part contacts and locks with the second load-bearing beam, it drives the rotating part to rotate and adjust the position of the locking part.

[0008] A further technical solution of this application: The rotating part specifically includes a rotating annular groove, a plug-in post and an overlapping ring. The overlapping ring is coaxially fixedly installed on the outside of the plug-in post. A number of plug-in holes are opened on the first load-bearing beam corresponding to the plug-in post position. One end of the plug-in post is connected to the first load-bearing beam through the plug-in hole. The rotating annular groove is opened around the outer ring surface of each plug-in hole. The lower end face of the overlapping ring is provided with an inner ring groove corresponding to the position of the rotating ring groove, and a plurality of rotating balls are rotatably arranged inside the inner ring groove, and the rotating balls are rotatably arranged inside the rotating ring groove. The locking part is installed above the other end of the plug.

[0009] A further technical solution of this application: The locking part specifically includes a locking seat, a trigger cavity and a trigger block. The locking seat is installed above the other end of the plug-in post, the trigger cavity is opened inside the locking seat, and the two sides of the trigger block are slidably installed inside the trigger cavity through stabilizing members. Two rotating shafts are symmetrically arranged on both sides inside the trigger cavity. A side buckle is rotatably connected to the outside of the rotating shaft. The side buckle extends inward from the end near the rotating shaft and has an inwardly tapered part. The two sides below the trigger block have downwardly pressing slopes corresponding to the inwardly tapered parts. When the trigger block is pressed down, it contacts the inwardly tapered parts through the downwardly pressing slopes, thereby driving the side buckle to rotate inward and fasten to the inside of the second load-bearing beam.

[0010] A further technical solution of this application: the stabilizing component specifically includes stabilizing grooves formed on both sides inside the trigger cavity, and a stabilizing block installed on the side of the trigger block, the stabilizing block being slidably installed inside the stabilizing groove; A spring is also installed at the bottom of the stabilizing groove, and the top of the spring is connected to the bottom of the stabilizing block.

[0011] A further technical solution of this application: Inner grooves are formed on both sides of the second load-bearing beam, and the end of the side buckle rod is connected to an inner buckle part, and the inner buckle part is connected to the inner groove.

[0012] A further technical solution of this application: the number of the side buckle rods is several.

[0013] A further technical solution of this application: several plates are evenly laid on the upper surface of the second load-bearing beam.

[0014] A further technical solution of this application: a plurality of top ring supports are provided around the outer side of one end of the single steel pipe pile connected to the first load-bearing beam, and the top ring supports are supported on the lower end face of the first load-bearing beam.

[0015] A method for a fall-prevention portal frame device used in cast-in-place box girder construction, the method comprising the following steps: Step 1: Construct a concrete strip foundation at the predetermined location of the existing road, fix and install multiple sets of steel pipe piles on the foundation, and install a first load-bearing beam extending laterally on the top of each set of steel pipe piles; install multiple rotating self-locking components at intervals along the longitudinal direction on the upper surface of each first load-bearing beam, and make the rotating self-locking components at corresponding positions above each first load-bearing beam form a group. Step 2: Use hoisting equipment to lift the second load-bearing beam above the same set of rotating self-locking components, and adjust the tilt angle of the second load-bearing beam to correspond to the oblique angle of the bridge axis. Step 3: Slowly lower the second load-bearing beam so that both ends of the second load-bearing beam fall onto the trigger blocks of the corresponding rotating self-locking components. The gravity of the second load-bearing beam presses down on the trigger blocks, and the trigger blocks push the inward part through the downward pressing slope, causing the side latch rod to rotate inward around the rotation axis. At the same time, the plug and the overlapping ring rotate freely in the rotating ring groove through the rotating ball, automatically adjusting the angle of the locking seat so that the inner latching part at the end of the side latch rod accurately engages in the inner latching groove on the side wall of the second load-bearing beam, completing the automatic angle adjustment and locking of the second load-bearing beam. Step 4: Repeat steps 3 to 2 to complete the erection of all second load-bearing beams in sequence; Step 5: Lay the cardboard, distribution beam and formwork above the second load-bearing beam, and install the fall protection net to form a complete doorway passage; Step 6: Carry out the cast-in-place box girder construction. After the construction is completed, reverse the operation to release the lock of the rotation self-locking component, and then remove the second load-bearing beam, the first load-bearing beam and the steel pipe pile in sequence.

[0016] Compared with the prior art, the technical solution provided by this invention has the following advantages: 1. This invention features a self-locking rotating assembly, allowing the plug-in column and overlapping ring to rotate freely within the rotating ring groove. When the second load-bearing beam presses down on the trigger block, the side latch rotates inward, and the entire locking part automatically rotates and aligns with the actual tilt direction of the second load-bearing beam. This eliminates the need for repeated angle adjustments by hoisting equipment, enabling precise installation in a single lift, significantly reducing construction time. Furthermore, the second load-bearing beam's own weight presses down on the trigger block, and the inclined surfaces of the pressing and inward-retracting parts engage, causing the side latch to rotate inward, automatically engaging the inner latch into the inner latch groove on the side wall of the second load-bearing beam. The entire locking process requires no external power or manual assistance, achieving locking upon beam placement, making operation simple and reliable.

[0017] 2. The inner locking part of the side locking rod of this invention forms a mechanical interlock with the inner locking groove of the second load-bearing beam. At the same time, the return spring keeps the trigger block in a compressed state after locking, preventing the side locking rod from accidentally disengaging. The top ring support further enhances the connection rigidity between the first load-bearing beam and the steel pipe pile, ensuring the overall stability of the doorway support. The rotational freedom of the rotating self-locking component allows the device to adapt to any angle of inclination between the second load-bearing beam and the first load-bearing beam, eliminating the need to design special components for different angles of inclination. It has good versatility and reusability. In addition, the steel pipe pile, the first load-bearing beam, the rotating self-locking component, and the second load-bearing beam are all detachably connected. After construction, the locking can be released by reversing the operation, and the components can be recycled separately, which meets the requirements of green construction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the second load-bearing beam in this invention; Figure 3 This is a top view of the structure of the present invention; Figure 4 This is a cross-sectional structural diagram of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A; Figure 6 This is a cross-sectional structural diagram of the rotational self-locking assembly of the present invention.

[0019] Explanation of the labels in the diagram: 1. Steel pipe pile; 2. Rotary self-locking assembly; 3. Second load-bearing beam; 4. Doorway; 5. Card plate; 6. First load-bearing beam; 7. Locking seat; 8. Rotating shaft; 9. Trigger chamber; 10. Side latch rod; 11. Trigger block; 12. Stabilizing block; 13. Rebound spring; 14. Stabilizing groove; 15. Inner closing ring groove; 16. Rotating ring groove; 17. Insertion post; 18. Rotating ball; 19. Top ring support; 20. Inner locking part; 21. Inner locking groove; 22. Downward pressing slope; 23. Inner closing part; 24. Overlap ring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention will be further described below with reference to the embodiments.

[0021] Example 1

[0022] Please see Figures 1 to 6 In one embodiment of this application, a fall-proof portal support device for cast-in-place box girder construction includes multiple sets of concrete strip foundations constructed at predetermined locations on existing roads, steel pipe piles 1 along the concrete strip foundations, portal passages 4 formed between the multiple sets of steel pipe piles 1, and a first load-bearing beam 6 extending laterally installed on the top of each set of steel pipe piles 1. Multiple rotating self-locking components 2 are installed on the upper surface of the first load-bearing beam 6, and the multiple rotating self-locking components 2 are arranged at intervals along the longitudinal direction; and the multiple rotating self-locking components 2 at corresponding positions above each of the first load-bearing beams 6 form a group. And a second load-bearing beam 3 spanning the same set of rotating self-locking components 2, the second load-bearing beam 3 and the first load-bearing beam 6 being arranged at an inclined cross.

[0023] Furthermore, the rotating self-locking assembly 2 includes a rotating part and a locking part. The rotating part is rotatably connected to the first load-bearing beam 6, and the locking part is installed on the rotating part. When the locking part contacts and locks with the second load-bearing beam 3, it drives the rotating part to rotate and adjust the position of the locking part.

[0024] Furthermore, the rotating part specifically includes a rotating annular groove 16, a plug-in post 17, and an overlapping ring 24. The overlapping ring 24 is coaxially fixedly installed on the outside of the plug-in post 17. A plurality of plug-in holes are opened on the first load-bearing beam 6 corresponding to the position of the plug-in post 17. One end of the plug-in post 17 is connected to the first load-bearing beam 6 through the plug-in holes. The rotating annular groove 16 is opened around the outer ring surface of each plug-in hole. The lower end face of the overlapping ring 24 is provided with an inner ring groove 15 corresponding to the position of the rotating ring groove 16, and a plurality of rotating balls 18 are rotatably arranged inside the inner ring groove 15, and the rotating balls 18 are rotatably arranged inside the rotating ring groove 16. The locking part is installed above the other end of the plug post 17.

[0025] Furthermore, the locking part specifically includes a locking seat 7, a trigger cavity 9, and a trigger block 11. The locking seat 7 is installed above the other end of the plug post 17, the trigger cavity 9 is opened inside the locking seat 7, and the trigger block 11 is slidably installed inside the trigger cavity 9 on both sides through stabilizing members. Two rotating shafts 8 are symmetrically arranged on both sides inside the trigger cavity 9. A side latch rod 10 is rotatably connected to the outside of the rotating shaft 8. The side latch rod 10 has an inwardly extending portion 23 near the rotating shaft 8. The trigger block 11 has a downward pressing slope 22 on both sides below the inwardly extending portion 23. When the trigger block 11 is pressed down, it contacts the inwardly extending portion 23 through the downward pressing slope 22, thereby driving the side latch rod 10 to rotate inward and fasten to the inside of the second load-bearing beam 3.

[0026] Furthermore, the stabilizing component specifically includes stabilizing grooves 14 formed on both sides inside the trigger cavity 9, and stabilizing blocks 12 installed on the side of the trigger block 11, wherein the stabilizing blocks 12 are slidably installed inside the stabilizing grooves 14. A spring 13 is also installed at the bottom of the stabilizing groove 14, and the top of the spring 13 is connected to the bottom of the stabilizing block 12.

[0027] Furthermore, the second load-bearing beam 3 has inner buckle grooves 21 formed on both sides, and the end of the side buckle rod 10 is connected to an inner buckle part 20, and the inner buckle part 20 is connected to the inner buckle groove 21.

[0028] Furthermore, the number of the side latches 10 is several.

[0029] Furthermore, several card plates 5 are evenly laid on the upper surface of the second load-bearing beam 3.

[0030] Furthermore, a plurality of top ring supports 19 are provided around the outer side of the end of each steel pipe pile 1 that is connected to the first load-bearing beam 6, and the top ring supports 19 are supported on the lower end face of the first load-bearing beam 6.

[0031] Specifically, this device includes multiple sets of concrete strip foundations constructed at predetermined locations on the existing road, and steel pipe piles 1 vertically installed along the concrete strip foundations. Doorway passages 4 are formed between the multiple sets of steel pipe piles 1 to allow vehicles to pass through the existing road below.

[0032] Each group of steel pipe piles 1 has a first load-bearing beam 6 fixedly installed on its top, extending laterally. The first load-bearing beam 6 can be made of I-beams or H-beams, and its two ends are connected to the top flange of the steel pipe pile 1 by flanges and high-strength bolts, or it can be fixed by welding.

[0033] Multiple rotating self-locking components 2 are installed on the upper surface of the first load-bearing beam 6, and these rotating self-locking components 2 are spaced apart longitudinally. Multiple rotating self-locking components 2 at corresponding positions above each first load-bearing beam 6 form a group; for example, two rotating self-locking components 2 located at the same longitudinal coordinate on two adjacent first load-bearing beams 6 form a group. Each group of rotating self-locking components 2 is used to support and lock a second load-bearing beam 3.

[0034] The second load-bearing beam 3 is mounted on the same set of rotating self-locking components 2, and the second load-bearing beam 3 and the first load-bearing beam 6 are inclined and intersecting each other in the horizontal plane. This inclination angle corresponds to the oblique angle between the box girder to be constructed and the existing road.

[0035] The self-locking rotating assembly 2 includes a rotating part and a locking part. The rotating part is rotatably connected to the first load-bearing beam 6, and the locking part is installed on the rotating part. When the locking part contacts and locks with the second load-bearing beam 3, it can drive the rotating part to rotate, thereby automatically adjusting the position of the locking part to adapt to the actual falling angle of the second load-bearing beam 3.

[0036] The rotating part specifically includes a rotating annular groove 16, a plug-in post 17, and an overlapping ring 24. A plug-in hole is provided on the upper surface of the first load-bearing beam 6 corresponding to the position of each rotating self-locking component 2. The lower end of the plug-in post 17 is inserted into the plug-in hole, thereby forming a rotatable connection with the first load-bearing beam 6. The overlapping ring 24 is coaxially fixedly installed on the outside of the plug-in post 17, located above the first load-bearing beam 6. A rotating annular groove 16 is provided around the outer surface of each plug-in hole. An inwardly tapering annular groove 15 is provided on the lower end face of the overlapping ring 24 corresponding to the position of the rotating annular groove 16. Multiple rotating balls 18 are rotatably disposed inside the inwardly tapering annular groove 15, and these rotating balls 18 are rotatably embedded within the rotating annular groove 16. Therefore, the plug-in post 17 and the overlapping ring 24 can rotate freely relative to the first load-bearing beam 6 with low frictional resistance.

[0037] The locking part is installed above the other end of the plug-in post 17. The locking part includes a locking seat 7, a trigger cavity 9, and a trigger block 11. The locking seat 7 is fixedly installed on the upper end of the plug-in post 17. The trigger cavity 9 is opened inside the locking seat 7, forming a hollow cavity. The trigger block 11 is slidably installed inside the trigger cavity 9 on both sides by stabilizing members, so that the trigger block 11 can move up and down.

[0038] The stabilizing components include stabilizing grooves 14 formed on the left and right sides inside the trigger cavity 9, and stabilizing blocks 12 installed on the sides of the trigger block 11. The stabilizing blocks 12 are slidably installed in the stabilizing grooves 14, serving as guides and preventing detachment. A return spring 13 is also installed at the bottom inner side of the stabilizing grooves 14, with its top end connected to the bottom of the stabilizing block 12. The return spring 13 always applies an upward force to the trigger block 11, keeping it in a high position when not under pressure.

[0039] Two rotating shafts 8 are symmetrically arranged on the left and right sides inside the trigger chamber 9, and a side latch 10 is rotatably connected to each rotating shaft 8. The side latch 10 has an inwardly extending portion 23 at the end near the rotating shaft 8. On the lower sides of the trigger block 11, corresponding to the position of the inwardly extending portion 23, downward pressing slopes 22 are formed, which are slopes that gradually contract inward from top to bottom.

[0040] The left and right side walls of the second load-bearing beam 3 are provided with inner buckle grooves 21. The end of the side buckle rod 10 is connected to an inner buckle part 20, the shape of which matches the inner buckle groove 21, and can be a right-angle hook or an arc hook.

[0041] The specific working principle is as follows: the hoisting equipment lifts the second load-bearing beam 3 above the same set of rotating self-locking components 2, roughly adjusts the tilt angle, and then slowly lowers it. The two ends of the second load-bearing beam 3 first contact the upper surface of the trigger block 11. Under the weight of the second load-bearing beam 3, the trigger block 11 moves downward against the elastic force of the return spring 13. As the trigger block 11 moves downward, its downward-pressing inclined portion 22 contacts the inclined surface of the inward-retracting portion 23 of the side latch rod 10. Because the inward-retracting portion 23 is subjected to an outward pushing force, and the side latch rod 10 rotates around the rotating shaft 8, the inner latching portion 20 at the end of the side latch rod 10 rotates inward. At the same time, the insertion post 17 and the overlapping ring 24 rotate freely within the rotating ring groove 16 via the rotating ball 18, allowing the entire locking part to automatically rotate and align according to the actual falling direction of the second load-bearing beam 3, thereby ensuring that the inner latching portion 20 can accurately align with the inner latching groove 21 on the side wall of the second load-bearing beam 3. When the trigger block 11 descends to its position, that is, when the lower surface of the second load-bearing beam 3 contacts the top support surface of the locking seat 7, the inner locking part 20 is already engaged in the inner locking groove 21, completing the automatic angle adjustment and locking of the second load-bearing beam 3.

[0042] Example 2

[0043] This embodiment is a further optimization based on Embodiment 1. To improve locking reliability and load-bearing capacity, the number of side latches 10 can be set to multiple, for example, two or three on each side, arranged at intervals along the length of the second load-bearing beam 3. Correspondingly, multiple inner latching grooves 21 are opened on the side wall of the second load-bearing beam 3, and the position and number of the inner latching grooves 21 correspond one-to-one with the side latches 10.

[0044] Example 3

[0045] This embodiment further enhances the connection strength based on Embodiment 1 or 2. Several top ring supports 19 are arranged around the outer side of the end of a single steel pipe pile 1 connected to the first load-bearing beam 6. The top ring supports 19 are triangular steel plate ribs or arc-shaped support plates, with their lower ends welded to the outer wall of the steel pipe pile 1 and their upper ends supported on the lower end face of the first load-bearing beam 6, and fixed by welding or bolts. The top ring supports 19 are evenly distributed around the circumference of the steel pipe pile 1, with a quantity of 4 to 8. The top ring supports 19 can effectively disperse the vertical load transmitted by the first load-bearing beam 6, improving the joint stiffness and overturning resistance.

[0046] Example 4

[0047] This embodiment further adds an anti-slip structure based on Embodiment 1. Several clamping plates 5 are evenly laid on the upper surface of the second load-bearing beam 3. The clamping plates 5 are rectangular steel plates, with their length direction arranged transversely along the second load-bearing beam 3. The clamping plates 5 are fixed to the top surface of the second load-bearing beam 3 by welding or bolts. The clamping plates 5 are used to limit the longitudinal displacement of the distribution beam laid above, preventing the distribution beam from sliding during concrete pouring. The spacing between adjacent clamping plates 5 is determined according to the spacing of the distribution beams.

[0048] Example 5

[0049] This embodiment adds a fall protection function to any of the aforementioned embodiments. A fall protection net is laid above the second load-bearing beam 3. The fall protection net can be made of wire mesh or high-strength dense mesh. The fall protection net is tied and fixed to the second load-bearing beam 3 and the distribution beam with iron wire or U-shaped clips. Its laying range should cover the entire transverse width of the portal passage 4, and be widened on both sides along the bridge direction. The fall protection net can effectively prevent tools, small components, or concrete debris from falling into the portal passage 4 during the construction process above, ensuring the safety of traffic on the existing road below.

[0050] Example 6

[0051] like Figures 1-6 As shown, the present invention relates to a method for using a fall-prevention portal frame device in cast-in-place box girder construction: The method includes the following steps: Step 1: Construct a concrete strip foundation at the predetermined location of the existing road, fix and install multiple sets of steel pipe piles 1 on the foundation, and install a first load-bearing beam 6 extending laterally on the top of each set of steel pipe piles 1; install multiple rotating self-locking components 2 at intervals along the longitudinal direction on the upper surface of each first load-bearing beam 6, and make the rotating self-locking components 2 at corresponding positions above each first load-bearing beam 6 form a group. Step 2: Use hoisting equipment to lift the second load-bearing beam 3 above the same set of rotating self-locking components 2, and adjust the tilt angle of the second load-bearing beam 3 so that it corresponds to the oblique angle of the bridge axis. Step 3: Slowly lower the second load-bearing beam 3 so that both ends of the second load-bearing beam 3 fall onto the trigger blocks 11 of the corresponding rotating self-locking components 2. The gravity of the second load-bearing beam 3 presses down on the trigger blocks 11. The trigger blocks 11 push the inward portion 23 through the downward pressing inclined portion 22, causing the side latch rod 10 to rotate inward around the rotating shaft 8. At the same time, the insertion post 17 and the overlapping ring 24 rotate freely in the rotating ring groove 16 through the rotating ball 18, automatically adjusting the angle of the locking seat 7 so that the inner latching portion 20 at the end of the side latch rod 10 accurately engages in the inner latching groove 21 on the side wall of the second load-bearing beam 3, thus completing the automatic angle adjustment and locking of the second load-bearing beam 3. Step 4: Repeat steps 3 to 2 to complete the erection of all second load-bearing beams 3 in sequence; Step 5: Lay the card plate 5 above the second load-bearing beam 3, distribute the beam and formwork, and install the fall protection net to form a complete doorway passage 4; Step 6: Carry out the cast-in-place box girder construction. After the construction is completed, reverse the operation to release the lock of the rotation self-locking component 2, and then remove the second load-bearing beam 3, the first load-bearing beam 6 and the steel pipe pile 1 in sequence.

[0052] In summary, this invention, by incorporating a rotating self-locking assembly, allows the plug-in column and overlapping ring to rotate freely within the rotating ring groove. When the second load-bearing beam presses down on the trigger block, the side latch rotates inward, and the entire locking part automatically rotates and aligns with the actual tilt direction of the second load-bearing beam. This eliminates the need for repeated angle adjustments by hoisting equipment, enabling precise erection in a single lift, significantly reducing construction time. Furthermore, the second load-bearing beam's own weight presses down on the trigger block, and the inclined surfaces of the pressing and inward-retracting parts engage, causing the side latch to rotate inward, automatically engaging the inner latch into the inner latch groove on the side wall of the second load-bearing beam. The entire locking process requires no external power or manual assistance, achieving locking upon beam placement, making the operation simple and reliable.

[0053] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fall-prevention portal frame device for cast-in-place box girder construction, comprising multiple sets of concrete strip foundations constructed at predetermined locations on existing roads, and steel pipe piles (1) along the concrete strip foundations, wherein portal passages (4) are formed between the multiple sets of steel pipe piles (1), characterized in that: Each group of steel pipe piles (1) has a first load-bearing beam (6) that extends laterally installed on top. Multiple rotating self-locking components (2) are installed on the upper surface of the first load-bearing beam (6), and the multiple rotating self-locking components (2) are arranged at intervals along the longitudinal direction; and the multiple rotating self-locking components (2) at corresponding positions above each first load-bearing beam (6) form a group; And a second load-bearing beam (3) spanning the same set of rotating self-locking components (2), the second load-bearing beam (3) and the first load-bearing beam (6) being arranged at an inclined cross.

2. The anti-fall portal frame support device for cast-in-place box girder construction according to claim 1, characterized in that, The rotating self-locking assembly (2) includes a rotating part and a locking part. The rotating part is rotatably connected to the first load-bearing beam (6). The locking part is installed on the rotating part. When the locking part contacts and locks with the second load-bearing beam (3), it drives the rotating part to rotate and adjust the position of the locking part.

3. A fall-prevention portal frame device for cast-in-place box girder construction according to claim 2, characterized in that, The rotating part specifically includes a rotating annular groove (16), a plug-in post (17), and an overlapping ring (24). The overlapping ring (24) is coaxially fixedly installed on the outside of the plug-in post (17). Several plug-in holes are opened on the first load-bearing beam (6) corresponding to the position of the plug-in post (17). One end of the plug-in post (17) is connected to the first load-bearing beam (6) through the plug-in holes. The rotating annular groove (16) is opened around the outer surface of each plug-in hole. The lower end of the overlapping ring (24) is provided with an inner ring groove (15) corresponding to the position of the rotating ring groove (16), and a plurality of rotating balls (18) are rotatably arranged inside the inner ring groove (15), and the rotating balls (18) are rotatably arranged inside the rotating ring groove (16). The locking part is installed above the other end of the plug (17).

4. A fall-prevention portal frame device for cast-in-place box girder construction according to claim 2, characterized in that, The locking part specifically includes a locking seat (7), a trigger cavity (9) and a trigger block (11). The locking seat (7) is installed above the other end of the plug-in post (17). The trigger cavity (9) is opened inside the locking seat (7). The trigger block (11) is slidably installed inside the trigger cavity (9) on both sides through stabilizing members. Two rotating shafts (8) are symmetrically arranged on both sides inside the trigger cavity (9). A side buckle (10) is rotatably connected to the outside of the rotating shaft (8). The side buckle (10) extends inward to one end near the rotating shaft (8) and has an inwardly recessed part (23). The trigger block (11) has a downwardly pressing inclined part (22) on both sides below the inwardly recessed part (23). During the process of the trigger block (11) being pressed down, it contacts the inwardly recessed part (23) through the downwardly pressing inclined part (22), thereby driving the side buckle (10) to rotate inward and fasten to the inside of the second load-bearing beam (3).

5. A fall-prevention portal frame device for cast-in-place box girder construction according to claim 4, characterized in that, The stabilizer specifically includes a stabilizing groove (14) opened on both sides inside the trigger cavity (9), and a stabilizing block (12) installed on the side of the trigger block (11). The stabilizing block (12) is slidably installed inside the stabilizing groove (14). A spring (13) is also installed at the bottom of the stabilizing groove (14), and the top of the spring (13) is connected to the bottom of the stabilizing block (12).

6. A fall-prevention portal frame device for cast-in-place box girder construction according to claim 5, characterized in that, The second load-bearing beam (3) has inner buckle grooves (21) on both sides, and the end of the side buckle rod (10) is connected to an inner buckle part (20), and the inner buckle part (20) is connected to the inner buckle groove (21).

7. A fall-prevention portal frame device for cast-in-place box girder construction according to claim 6, characterized in that, The number of the side buckle rods (10) is several.

8. A fall-prevention portal frame device for cast-in-place box girder construction according to claim 1, characterized in that, The upper surface of the second load-bearing beam (3) is evenly covered with several card plates (5).

9. A fall-prevention portal frame device for cast-in-place box girder construction according to claim 3, characterized in that, A number of top ring supports (19) are provided around the outer side of one end of the single steel pipe pile (1) connected to the first load-bearing beam (6), and the top ring supports (19) are supported on the lower end face of the first load-bearing beam (6).

10. A method for using a fall-prevention portal frame device for cast-in-place box girder construction as described in any one of claims 1 to 9, characterized in that, The method includes the following steps: Step 1: Construct a concrete strip foundation at the predetermined location of the existing road, fix and install multiple sets of steel pipe piles (1) on the foundation, and install a first load-bearing beam (6) extending laterally on the top of each set of steel pipe piles (1); install multiple rotating self-locking components (2) at intervals along the longitudinal direction on the upper surface of each first load-bearing beam (6), and make the rotating self-locking components (2) at corresponding positions above each first load-bearing beam (6) form a group; Step 2: Use hoisting equipment to hoist the second load-bearing beam (3) above the same set of rotating self-locking components (2), and adjust the tilt angle of the second load-bearing beam (3) so that it corresponds to the oblique angle of the bridge axis. Step 3: Slowly lower the second load-bearing beam (3) so that both ends of the second load-bearing beam (3) fall onto the trigger blocks (11) of the corresponding rotating self-locking components (2). The gravity of the second load-bearing beam (3) presses down on the trigger blocks (11). The trigger blocks (11) push the inward part (23) through the downward pressing slope (22), causing the side buckle rod (10) to rotate inward around the rotating shaft (8). At the same time, the plug-in column (17) and the overlapping ring (24) rotate freely in the rotating ring groove (16) through the rotating ball (18), automatically adjusting the angle of the locking seat (7), so that the inner buckle part (20) at the end of the side buckle rod (10) accurately engages in the inner buckle groove (21) on the side wall of the second load-bearing beam (3), completing the automatic angle adjustment and locking of the second load-bearing beam (3). Step 4: Repeat steps 3 to 2 to complete the erection of all the second load-bearing beams (3); Step 5: Lay the cardboard plate (5) above the second load-bearing beam (3), distribute the beam and template, and install the anti-fall net to form a complete doorway passage (4). Step 6: Carry out the construction of the cast-in-place box girder. After the construction is completed, reverse the operation to release the lock of the rotating self-locking component (2), and remove the second load-bearing beam (3), the first load-bearing beam (6) and the steel pipe pile (1) in sequence.

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