A safety passage system for construction of a hanging basket of a cantilever beam in a limited space

Abstract

The application relates to a limited-space suspended pouring beam trolley construction safety passage system and belongs to the field of bridge construction, which comprises a trolley frame and a passage walkway. The trolley frame comprises a suspension cable, two main bearing beams and a plurality of auxiliary bearing beams. The lower end of the suspension cable is connected with the main bearing beams. The length direction of the main bearing beams is perpendicular to the extension direction of the suspended pouring beam. The auxiliary bearing beams are connected to the main bearing beams. The length direction of the auxiliary bearing beams is perpendicular to the length direction of the main bearing beams. The passage walkway comprises one horizontal walkway and two side walkways. Two matching beams are fixedly arranged on the trolley frame. The length direction of the matching beams is perpendicular to the length direction of the main bearing beams. A lap joint groove is formed below the side walkway. The matching beams are located in the lap joint groove. One end of the matching beams extends to the outside of the trolley frame. The application is matched by the matching beams and the matching groove. The passage walkway is horizontally guided during the assembly process of the passage walkway. The convenience of the assembly operation is improved. The unfavorable factors of the space condition are reduced.

Description

Technical Field

[0001] This application relates to the field of bridge construction, and in particular to a safe passage system for the construction of cantilever beams using formwork in confined spaces. Background Technology

[0002] Prestressed concrete continuous beams, due to the unloading effect of negative bending moments at the supports, significantly reduce the positive bending moment at mid-span, resulting in a smaller bending moment area and increased span capacity. Therefore, they are widely used in bridge and high-speed rail construction. Currently, cantilever continuous beam construction generally employs hanging basket construction. This technology is mature and stable, unaffected by environmental factors such as pier height and water depth. Construction can proceed segment by segment from the already cast piers towards the span, reducing the construction difficulty of long-span bridges and saving time and costs associated with scaffolding erection.

[0003] The box girder of the bridge has a "20" shaped cross section with wing structures on both sides. During the pouring process, the load-bearing truss and traction device are first erected, and then the hanging basket is assembled under the load-bearing truss. The load-bearing truss and the hanging basket are connected by slings. The pouring template and pedestrian safety passage are then arranged on the hanging basket in sequence. The shape and structure of the pouring template correspond to the outline of the box girder. The safety passage and the pouring template are both steel structure components. After being assembled on the ground, they are hoisted to the position of the hanging basket by hoisting tools.

[0004] The pedestrian safety passage is located on the side of the casting formwork and is close to it. When the wing structure of the box girder is wide, the safety passage on the side of the hanging basket is completely within the narrow space formed by the wing of the box girder, the formwork corresponding to the side wall of the box girder, and the slings, as shown in the attached figure of Chinese invention with publication number CN115897417A. That is, the hoisting and installation of the safety passage located on the side of the hanging basket is subject to a certain degree of space restriction, making the installation operation inconvenient. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a safe passage system for the construction of suspended beams with formwork in confined spaces.

[0006] The technical solution provided in this application for a confined space cantilever beam formwork construction safety passage system adopts the following:

[0007] A safety passage system for cantilever beam construction in confined space includes a hanging basket frame and passageway slabs. The hanging basket frame includes suspension cables, two main load-bearing beams, and several secondary load-bearing beams. The lower ends of the suspension cables are connected to the main load-bearing beams, and the length direction of the main load-bearing beams is perpendicular to the extension direction of the cantilever beam. The secondary load-bearing beams are connected to the main load-bearing beams, and their length direction is perpendicular to the length direction of the main load-bearing beams. The passageway slabs include a horizontal slab and two side slabs. Two cooperating beams are fixedly installed on the hanging basket frame, and their length direction is perpendicular to the length direction of the main load-bearing beams. An overlap groove is provided below the side slabs, and the cooperating beams are located in the overlap grooves, with one end of each cooperating beam extending outside the hanging basket frame.

[0008] By adopting the above technical solution, after the passageway slab is hoisted to the hanging basket frame, the side slab and the matching beam are initially positioned by cooperating with each other through the lap groove. At the same time, the hanging basket frame provides support for the rear end of the passageway slab. Subsequently, a lateral thrust is applied to the passageway slab to make it slide to the final installation position. During this process, the cooperation between the lap groove and the matching beam plays a role in sliding guidance.

[0009] Preferably, a matching channel steel is slidably disposed on the matching beam, the matching channel steel is fastened to the matching beam, an adjusting wheel is rotatably disposed in the groove of the matching channel steel, the wheel surface of the adjusting wheel rolls against the upper surface of the matching beam, the side of the matching channel steel away from the matching beam abuts against the bottom of the lap groove, and the length direction of the matching channel steel is consistent with that of the lap groove.

[0010] By adopting the above technical solution, during the process of pushing and sliding the channel plate to the installation position, the lower edge of the side plate is directly supported by the channel steel, and it rolls relative to the cooperating beam through the adjusting wheel, making the assembly and relocation process of the channel plate smoother.

[0011] Preferably, a positioning pin is fixedly connected to the side of the mating channel steel facing the side walk plate, and a positioning hole is provided on the side walk plate for the positioning pin to pass through. Multiple mating balls are embedded in the wall of the positioning hole, and the mating balls roll and abut against the side wall of the positioning pin.

[0012] By adopting the above technical solution, the positioning pin is used to determine the relative position between the side walk plate and the matching channel steel, which is beneficial for the matching channel steel to guide the passage walk plate more stably and accurately.

[0013] Preferably, the upper surface of the mating beam is provided with a positioning groove for the adjusting wheel to be inserted. After the adjusting wheel enters the positioning groove, the bottom of the groove of the mating channel steel abuts against the upper surface of the mating beam.

[0014] By adopting the above technical solution, when the matching channel steel moves to the position groove where the adjusting wheel enters, it indicates that the matching channel steel has moved into place, and thereafter the matching channel steel cannot move relative to the matching beam, and it and the channel plate it carries are in a stable position.

[0015] Preferably, a temporary pin is slidably connected to the mating beam, the temporary pin slides in a vertical direction, the side wall of the temporary pin abuts against one end of the mating channel steel, and a travel stop is fixedly connected to the mating beam, the travel stop abutting against the other end of the mating channel steel.

[0016] By adopting the above technical solution, temporary pins and travel baffles clamp the matching channel steel before the assembly channel plate moves, so that the matching channel steel is stably placed near the end of the bridge extension construction close to the matching beam, thus successfully completing the task.

[0017] Preferably, a responsive spring is connected to the mating beam, the responsive spring is fixedly connected to the lower end of the temporary pin, and a pressure pin stop is fixedly connected to the end of the side walk plate away from the cross walk plate. The pressure pin stop abuts against the upper end of the temporary pin, and the thickness of the pressure pin stop is greater than the thickness of the mating channel steel.

[0018] By adopting the above technical solution, after the pressure pin baffle presses down the temporary pin, it means that the cooperation between the channel plate and the mating channel steel is completed. At this time, the temporary pin is pressed down and its restriction on the mating channel steel is released, and the mating channel steel can move.

[0019] Preferably, a clamping plate is detachably connected to the positioning pin via threads, and the clamping plate abuts against the side of the side plate opposite to the mating channel steel.

[0020] By adopting the above technical solution, after the channel plate is placed stably, the clamping plate is rotated onto the positioning pin. The clamping plate abuts against the side of the side plate away from the mating channel steel, which can seal the gap between the positioning hole wall and the positioning pin, and at the same time improve the relative stability between the channel plate and the mating channel steel.

[0021] Preferably, the secondary load-bearing beam is threaded with mounting bolts, which pass through the cross plate and are screwed into the secondary load-bearing beam.

[0022] By adopting the above technical solution, after the bolts are inserted through the horizontal walkway and screwed into the sub-load-bearing beam, the fixed connection between the walkway and the hanging basket frame is achieved.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. After the passageway slab is hoisted to the hanging basket frame by setting up the lap groove and the matching beam, the side slab and the matching beam are initially positioned by cooperating with each other through the lap groove. At the same time, the hanging basket frame provides support for the rear end of the passageway slab. Then, a lateral thrust is applied to the passageway slab to make it slide to the final installation position. During this process, the cooperation between the lap groove and the matching beam plays a role in sliding guidance.

[0025] 2. By using the matching channel steel, during the process of pushing and sliding the channel plate to the installation position, the matching channel steel directly supports the lower edge of the side plate, and rolls relative to the matching beam through the adjusting wheel, making the assembly and relocation process of the channel plate smoother. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the hanging basket frame used in the embodiments of this application to illustrate the safety passage system for the construction of cantilever beams in confined space.

[0027] Figure 2 This is a schematic diagram illustrating the structure of the channel walkway in the embodiments of this application.

[0028] Figure 3 yes Figure 1 A magnified view of part A in the middle.

[0029] Figure 4 This is a structural schematic diagram illustrating the working principle of the temporary pin in the embodiments of this application.

[0030] Figure 5 This is a schematic diagram illustrating the structure of the channel walkway after it is assembled on the hanging basket frame in the embodiments of this application.

[0031] Figure 6 This is a schematic diagram illustrating the mating structure of the positioning pin and the positioning hole in the embodiments of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Hanging basket frame; 11. Suspension cable; 12. Main load-bearing beam; 13. Secondary load-bearing beam; 131. Mounting bolt; 14. Casting formwork; 2. Passageway slab; 21. Horizontal slab; 22. Side slab; 221. Overlap groove; 222. Pressure pin side guard; 23. Positioning hole; 231. Matching ball bearing; 3. Matching beam; 31. Positioning groove; 32. Stroke side guard; 33. Temporary pin; 331. Response spring; 4. Matching channel steel; 41. Adjusting wheel; 42. Positioning pin; 421. Pressure plate. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0034] This application discloses a safety passage system for the construction of cantilever beams with formwork in confined spaces, such as... Figure 1and 2 As shown, the structure includes a hanging basket frame 1 and a walkway 2. The hanging basket frame 1 is located at the cut-off section of the bridge box girder and is used to support the casting formwork 14 and the walkway 2. The casting formwork 14 is used for the molding of the box girder concrete, and the walkway 2 is used for workers to walk on. During the construction of the structure, the hanging basket frame 1 is assembled first, and then the casting formwork 14 and the walkway 2 are installed sequentially by hoisting.

[0035] like Figure 1 As shown, the hanging basket frame 1 includes suspension cables 11, two main load-bearing beams 12, and several secondary load-bearing beams 13. The upper end of the suspension cables 11 is connected to the load-bearing truss, and the lower end is fixedly connected to the main load-bearing beams 12. The two main load-bearing beams 12 are arranged side by side, and their length directions are perpendicular to the extension direction of the bridge's cantilever beams. Each secondary load-bearing beam 13 is arranged sequentially along the length direction of the main load-bearing beams 12, and its own length direction is consistent with the extension direction of the bridge's cantilever beams. Each secondary load-bearing beam 13 is erected on the main load-bearing beams 12 and fixedly connected to them. The box girder of the bridge has a "T"-shaped cross-section, with wing structures on both sides of its upper part. Therefore, the upper parts of both sides of the casting formwork 14 also have wing structures extending in opposite directions. All secondary load-bearing beams 13 are located in the middle of the main load-bearing beams 12, and the casting formwork 14 is fixedly placed on the secondary load-bearing beams 13.

[0036] like Figure 1 and 2 As shown, the walkway 2 is U-shaped, comprising a horizontal walkway 21, two side walkways 22, and a railing fixed thereon. The two side walkways 22 are respectively fixedly connected to the opposite ends of the horizontal walkway 21. During installation, the walkway 2 is first assembled on the ground and then hoisted and raised as a whole. The two side walkways 22 will be located on opposite sides of the casting formwork 14, and the horizontal walkway 21 will be located on the side of the hanging basket frame 1 facing the extension direction of the bridge's cantilever beam. Since the installation position of the side walkways 22 is within the space enclosed by the casting formwork 14, the suspension cable 11, and the main load-bearing beam 12, during installation, the hoisting equipment controls the side walkways 22 to enter their required installation position in the opposite direction of the extension direction of the bridge's cantilever beam.

[0037] like Figure 1 , 2As shown in Figure 3, the main load-bearing beam 12 is equipped with a structure to improve the ease of operation and coordination during the installation of the passageway slab 2, including a cooperating beam 3 and a cooperating channel steel 4. There are two cooperating beams 3, located on opposite sides of the casting template 14. Each cooperating beam 3 is fixedly connected to both main load-bearing beams 12 simultaneously, and the length direction of the cooperating beam 3 is consistent with the length direction of the secondary load-bearing beam 13. The number of cooperating channel steels 4 is the same as the number of cooperating beams 3, and they correspond one-to-one. The slots of the cooperating channel steel 4 are placed face down on the cooperating beam 3. Adjusting wheels 41 are rotatably installed inside the slots of the cooperating channel steel 4. There are two pairs of adjusting wheels 41, totaling four. The wheel surfaces of the adjusting wheels 41 roll and abut against the upper surface of the cooperating beam 3. The cooperating channel steel 4 slides relative to the cooperating beam 3 through the adjusting wheels 41, and the upper surface of the cooperating channel steel 4 directly abuts against the side passageway 22, thus serving as a transfer platform for the transverse assembly of the passageway slab 2.

[0038] like Figure 1 , 3 As shown in Figure 4, a temporary pin 33 is slidably connected to the mating beam 3. The sliding direction of the temporary pin 33 is vertical. At the same time, a response spring 331 is connected to the mating beam 3. The upper end of the response spring 331 is fixedly connected to the lower end of the temporary pin 33, and the lower end of the response spring 331 is fixedly connected to the mating beam 3. In its natural state, the temporary pin 33 extends out of the surface of the mating beam 3. When compressed, the temporary pin 33 can be completely retracted into the mating beam 3. A travel stop 32 is also fixedly connected to one end of the mating beam 3 along the extension direction of the bridge's cantilever beam. In its natural state, the upper ends of the temporary pin 33 and the upper ends of the travel stop 32 are both higher than the mating channel steel 4, and their side edges abut against the opposite end faces of the mating channel steel 4 to clamp it, so that the mating channel steel 4 is stably located at one end of the mating beam 3 along the extension direction of the bridge's cantilever beam.

[0039] like Figure 2 , 5 As shown in Figure 6, a positioning pin 42 is fixedly connected to the side of the channel steel 4 facing the side walk plate 22. The side walk plate 22 has a positioning hole 23 for the positioning pin 42 to pass through. Multiple mating balls 231 are embedded in the hole wall of the positioning hole 23. After the channel walk plate 2 is hoisted to the side of the hanging basket frame 1, the positioning hole 23 is aligned with the positioning pin 42 and then the channel walk plate 2 is controlled to descend, thereby positioning the side walk plate 22 and the mating channel steel 4. During this process, the mating balls 231 roll and abut against the side wall of the positioning pin 42, improving the smoothness of the perforation. A pressure pin stop 222 is fixedly connected to the end of the side walk plate 22 away from the transverse walk plate 21. The thickness of the pressure pin stop 222 is greater than the thickness of the matching channel steel 4. When the lower surface of the side walk plate 22 is in contact with the upper surface of the matching channel steel 4, the pressure pin stop 222 can press the temporary pin 33 down a certain distance so that the upper end of the temporary pin 33 is lower than the bottom of the channel of the matching channel steel 4. That is, the temporary pin 33 cannot limit the sliding of the matching channel steel 4, and the matching channel steel 4 can slide in the opposite direction to the extension direction of the cantilever beam of the bridge.

[0040] like Figure 1 , 2 As shown in Figures 3 and 5, the upper surface of the cooperating beam 3 has two pairs of four positioning slots 31. Each positioning slot 31 corresponds to an adjusting wheel 41, and each positioning slot 31 is used for the adjusting wheel 41 to be inserted. When the adjusting wheel 41 enters the positioning slot 31, the cooperating channel steel 4 can no longer slide, and at the same time, the channel walk plate 2 moves to the predetermined installation position. The lifting device slowly lowers the channel walk plate 2, so that the bottom of the groove of the cooperating channel steel 4 fits against the upper surface of the cooperating beam 3. At this time, the side of the horizontal walk plate 21 away from the side walk plate 22 is also located on the side of the travel stop edge 32 facing the temporary pin 33. The horizontal walk plate 21 naturally rests on the part of the secondary load-bearing beam 13 that extends out of the casting template 14. The secondary load-bearing beam 13 is threaded with mounting bolts 131. The mounting bolts 131 pass through the horizontal walk plate 21 and are screwed into the secondary load-bearing beam 13, thereby realizing the fixed connection between the channel walk plate 2 and the hanging basket frame 1. The positioning pin 42 has an external thread structure, which is detachably connected to the clamping plate 421 via the thread. After the channel plate 2 is placed stably, the clamping plate 421 is screwed onto the positioning pin 42. The clamping plate 421 abuts against the side of the side plate 22 away from the mating channel steel 4, which can seal the gap between the positioning hole 23 and the positioning pin 42, and also improve the relative stability between the channel plate 2 and the mating channel steel 4.

[0041] The implementation principle of a confined space cantilever beam hanging basket construction safety passage system according to an embodiment of this application is as follows:

[0042] The matching channel steel 4 and the matching beam 3 cooperate with each other and slide relative to each other. Therefore, the matching channel steel 4 serves as a guide for the lateral feeding during the suspension installation of the channel walkway 2, making the process of the side walkway 22 of the channel walkway 2 entering the installation position more stable and the positioning more quick and accurate. This reduces the inconvenience caused by the objectively unfavorable spatial conditions to the installation operation of the channel walkway 2.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A safety passage system for suspended beam construction in confined space, comprising a suspended beam frame (1) and a passageway (2), wherein the suspended beam frame (1) comprises a suspension cable (11), two main load-bearing beams (12) and several secondary load-bearing beams (13), the lower end of the suspension cable (11) is connected to the main load-bearing beams (12), the length direction of the main load-bearing beams (12) is perpendicular to the extension direction of the suspended beam, the secondary load-bearing beams (13) are connected to the main load-bearing beams (12), the length direction of the secondary load-bearing beams (13) is perpendicular to the length direction of the main load-bearing beams (12), and the passageway (2) comprises a transverse passageway (21) and two side passageways (22), characterized in that: Two cooperating beams (3) are fixedly installed on the hanging basket frame (1). The length direction of the cooperating beam (3) is perpendicular to the length direction of the main load-bearing beam (12). An overlap groove (221) is opened below the side walk plate (22). The cooperating beam (3) is located in the overlap groove (221). One end of the cooperating beam (3) extends to the outside of the hanging basket frame (1). A matching channel steel (4) is slidably arranged on the matching beam (3). The matching channel steel (4) is fastened on the matching beam (3). An adjusting wheel (41) is rotatably arranged in the groove of the matching channel steel (4). The wheel surface of the adjusting wheel (41) rolls against the upper surface of the matching beam (3). The side of the matching channel steel (4) away from the matching beam (3) abuts against the bottom of the lap groove (221). The length direction of the matching channel steel (4) is consistent with that of the lap groove (221). A temporary pin (33) is slidably connected to the mating beam (3). The sliding direction of the temporary pin (33) is vertical. The side wall of the temporary pin (33) abuts against one end of the mating channel steel (4). A travel stop (32) is also fixedly connected to the mating beam (3). The travel stop (32) abuts against the other end of the mating channel steel (4). A response spring (331) is connected to the mating beam (3). The response spring (331) is fixedly connected to the lower end of the temporary pin (33). A pressure pin stop (222) is fixedly connected to the end of the side walk plate (22) away from the cross walk plate (21). The pressure pin stop (222) abuts against the upper end of the temporary pin (33). The thickness of the pressure pin stop (222) is greater than the thickness of the mating channel steel (4).

2. The confined space cantilever beam hanging basket construction safety passage system according to claim 1, characterized in that: The matching channel steel (4) is fixedly connected to a positioning pin (42) on the side facing the side walk plate (22). The side walk plate (22) has a positioning hole (23) through which the positioning pin (42) passes. Multiple matching balls (231) are embedded in the hole wall of the positioning hole (23). The matching balls (231) roll against the side wall of the positioning pin (42).

3. The confined space cantilever beam hanging basket construction safety passage system according to claim 1, characterized in that: The upper surface of the mating beam (3) is provided with a positioning groove (31) for the adjusting wheel (41) to be inserted. After the adjusting wheel (41) enters the positioning groove (31), the bottom of the groove of the mating channel steel (4) abuts against the upper surface of the mating beam (3).

4. A safety passage system for construction of cantilever beams in confined space according to claim 2, characterized in that: The positioning pin (42) is detachably connected to a clamping plate (421) by a thread, and the clamping plate (421) abuts against the side of the side plate (22) away from the mating channel steel (4).

5. A confined space cantilever beam hanging basket construction safety passage system according to any one of claims 1-4, characterized in that: The sub-load-bearing beam (13) is threaded with mounting bolts (131), which pass through the cross plate (21) and are screwed into the sub-load-bearing beam (13).

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