A large-span wide-body bridge cantilever pouring device and a pouring method thereof

Abstract

The application discloses a large-span wide-body bridge cantilever pouring equipment and a pouring method thereof, and particularly relates to the technical field of bridge construction. The equipment comprises a hanging basket system and a mold system. The mold system is installed on the hanging basket system. The hanging basket system comprises a main beam and a bottom basket. The mold system comprises a side mold, a bottom mold, an end mold and an inner mold. The end mold is arranged at the end of the side mold and the bottom mold. The end mold is provided with a hollow filling mechanism at the position corresponding to the bottom mold. The hollow filling mechanism comprises a pre-inserted rod. The bottom of the end mold is fixedly connected with a butt joint seat. The pre-inserted rod is fixedly installed with an expansion capsule outside the region in the pouring space. The inside of the pre-inserted rod is provided with an air duct system. The application can adjust the gravity center position of the initial injected concrete by means of the filling of the expansion capsule, so that the concrete in the mold system at both ends of the box girder is relatively balanced, the influence of the unbalanced moment on the rotating system of the bottom of the pier is reduced, and the safety of construction is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction technology, more particularly, the present application relates to a large-span wide-body bridge cantilever pouring equipment and a pouring method thereof. BACKGROUND

[0002] Large-span continuous beams are widely used in the development of modern railway transportation systems. For some bridges, due to site constraints, full-frame pouring construction cannot be used, so hanging basket bridge construction machines are often used for construction, and hanging basket construction schemes are increasingly mature and widely used. This method allows pouring of concrete beams from the piers to both sides in sections without using a large number of temporary supports, which is very suitable for bridge construction across rivers, valleys or other obstacles.

[0003] The hanging basket is a movable working platform system, which is usually composed of a main truss, a walking system, a formwork system, a working platform and an anchoring device. During construction, the hanging basket is fixed on the already poured beam section, and the reinforcement binding and concrete pouring of the next section are carried out on the basis of the hanging basket. When the concrete of the new section reaches the design strength, the hanging basket is released and moved to the next position through the walking system to continue the construction of the next beam body. In order to ensure the balance of the beam body during construction, it is necessary to pour and construct on both sides at the same time to avoid accidents caused by excessive weight on one side.

[0004] When railway road construction encounters the need to cross existing railways, the swivel method of construction needs to be adopted. The swivel method of construction refers to the T-shaped rigid frame bridge, which is constructed by pouring the beam on one side of the railway in operation, and then through the swivel system, the horizontal rotation is completed within the railway closure time to reach the designed position. After the swivel is completed, the concrete of the upper and lower turntables is sealed and fixed, and finally the beam body is closed.

[0005] The basic principle of swivel is that the weight of the main beam is transmitted to the upper spherical hinge through the pier column, and the upper spherical hinge is transmitted to the lower spherical hinge and the pile cap through the polytetrafluoroethylene slide between the spherical hinges. After the main beam construction is completed, the supports (hanging baskets) and the empty sandboxes are removed to transfer the entire weight of the beam body to the spherical hinge, and then the weight is measured and counterbalanced. The traction cable buried in the upper turntable and the continuous action jack of the swivel are used to overcome the dynamic friction torque between the upper and lower spherical hinges and between the support legs and the lower slide, so that the beam body is rotated into position.

[0006] The swivel body structure is composed of a lower swivel body turntable, a spherical hinge, an upper swivel body turntable and a rotating traction system. The lower swivel body turntable is a foundation supporting the whole weight of the swivel body structure. Main components of the lower swivel body turntable include a lower spherical hinge and its framework, a lower slide and its framework, a central positioning shaft and a jack counterforce seat. The lower swivel body turntable and the lower slide are pre-buried on the bearing platform. Main components of the upper swivel body turntable include an upper spherical hinge and its framework and a support leg. After the above-mentioned swivel body structure is pre-built, the turntable construction is carried out so that the upper swivel body turntable and the support leg are formed in the turntable. The swivel body traction cable is pre-buried in the turntable. The exposed part of the traction cable is smoothly wound around the turntable and is placed on the pre-buried steel bars without interference.

[0007] Since the main girder structure of the swivel body bridge is mainly supported by the swivel body system and the auxiliary support system before the swivel body bridge is completely closed, the balance requirement of the pouring on both sides is higher during the cantilever pouring construction of the swivel body bridge compared with the cantilever girder construction of the fixed pier. However, in some railway designs, the corresponding swivel body bridge is in an up-and-down slope state, that is, the cantilever girder is inclined compared with the pier. The concrete poured into the pouring mold in the hanging basket at both ends has a certain fluidity and flows to the lower part of the mold. Therefore, although the pouring of the hanging baskets on both sides is synchronized, the concrete first gathers in the lower part when the concrete is initially poured, which causes the center of gravity of the poured concrete to deviate from the center of the hanging basket mold. The distance between the centers of gravity of the concrete in the hanging basket molds on the high and low sides from the pier also changes. For example, the concrete initially poured into the hanging basket mold at the lower end tends to move away from the pier when it flows to the lower part. On the contrary, the concrete initially poured into the hanging basket mold at the higher end tends to move closer to the pier when it flows to the lower part. Therefore, an unbalanced pressure is generated during the initial pouring of the concrete. For a relatively short and narrow cantilever girder, the moment caused by the above imbalance is small and does not affect the swivel body system and subsequent construction. However, for a relatively wide and long cantilever girder, the amount of concrete poured is large, the weight is large, the distance from the pier is long when the construction is close to the end, the force arm is large, and the unbalanced moment generated is also relatively large, which easily affects the construction safety, especially when the unbalanced moment acts on the swivel body system, which easily causes damage to the swivel body system and affects the subsequent construction. SUMMARY

[0008] The present application provides a large-span wide-body bridge cantilever pouring equipment and a pouring method thereof. The problem to be solved is that when the concrete is initially poured into the inclined cantilever girder, the concrete first gathers in the lower part, which causes the center of gravity of the poured concrete to deviate from the center of the hanging basket mold. The unbalanced moment generated is relatively large, which easily affects the construction safety, especially when the unbalanced moment acts on the swivel body system, which easily causes damage to the swivel body system and affects the subsequent construction.

[0009] To achieve the above object, the present application provides the following technical scheme: a large-span wide-body bridge cantilever pouring equipment, comprising a trolley system and a mold system, the mold system is installed on the trolley system, the trolley system comprises a main beam and a bottom basket, the mold system comprises a side mold, a bottom mold, an end mold and an inner mold, the end mold is arranged at the end of the side mold and the bottom mold, the end mold is provided with a hollow filling mechanism at the position corresponding to the bottom mold, the hollow filling mechanism comprises a pre-inserting rod, the bottom of the end mold is fixedly connected with a butt joint seat, the pre-inserting rod is inserted into the butt joint seat, and the pre-inserting rod penetrates through the end mold and extends to the bottom of the pouring space of the mold system;

[0010] The pre-inserting rod is fixedly installed outside the region in the pouring space, the inside of the pre-inserting rod is provided with an air channel system, the pre-inserting rod is provided with an air hole corresponding to the position of the inner cavity of the expansion capsule, the air hole is communicated with the air channel system, the air channel system is connected with an air pump and a gas release control valve through a pipeline, the air pump is used for filling gas into the expansion capsule to make the expansion capsule expand, and the gas release control valve is used for discharging air in the expansion capsule to make the expansion capsule shrink.

[0011] In a preferred embodiment, the pre-inserting rod is a long rod structure, the expansion capsules are arranged in multiple groups, the multiple groups of expansion capsules are arranged in sequence along the length direction of the pre-inserting rod, and the inside of the pre-inserting rod is provided with a gas filling control mechanism, which is used for controlling the gas filling and gas release of the expansion capsules in the corresponding region.

[0012] In a preferred embodiment, the gas filling control mechanism comprises an air sliding rod, the air sliding rod is slidingly installed in the inside of the pre-inserting rod, the air channel system is formed in the air sliding rod, a plurality of communication air slots are arranged on the air sliding rod, the communication air slots are used for butt joint with the air holes, the number of the communication air slots is less than the number of the expansion capsules, and a control handle is arranged on the air sliding rod.

[0013] In a preferred embodiment, the pre-inserting rod is provided with a butt joint disc, the butt joint disc is butt jointed with the butt joint seat, and a lock catch assembly for locking the butt joint disc is arranged on the butt joint seat.

[0014] In a preferred embodiment, one end of the pre-inserting rod located in the mold system is provided with a plugging plug, the plugging plug is detachably connected with the pre-inserting rod, and a containing groove for containing the plugging plug is arranged at the position corresponding to the pre-inserting rod on the inner side wall of the end mold.

[0015] In a preferred embodiment, a pressure cavity is arranged in the butt joint seat, an elastic sealing ring is arranged in the pressure cavity, the elastic sealing ring is used for slidingly cooperating with the outer wall of the pre-inserting rod, the elastic sealing ring is in an annular structure, an oil injection pipe connected with an oil injection pump is connected with the pressure cavity.

[0016] In a preferred embodiment, a positioning sleeve is arranged in the docking disc, the positioning sleeve is snap-fitted on the outside of the pre-inserting rod, an elastic pad is arranged between the positioning sleeve and the pre-inserting rod, and a mounting clasp is fixedly connected to one end of the pre-inserting rod outside the end mold, the mounting clasp being used for mounting the vibrator.

[0017] In a preferred embodiment, one inflation bag is arranged for each group, and the inflation bag is in a circular structure and arranged around the outside of the pre-inserting rod.

[0018] In a preferred embodiment, two inflation bags are arranged for each group, the two inflation bags are arranged on the two sides of the pre-inserting rod respectively, air holes are arranged on the pre-inserting rod corresponding to the two sides, an air passage slide rod is rotatably arranged in the pre-inserting rod, the air passage system includes a first air passage and a second air passage, the first air passage and the second air passage are both provided with a communication air slit for docking with the air holes, the first air passage is connected with the air pump, the second air passage is connected with the air release control valve, a control handle is slidably arranged outside the air passage slide rod, a sliding guide structure is arranged between the control handle and the air passage slide rod, and the hollow filling mechanism further includes a rotation controller for driving the control handle to rotate.

[0019] A pouring method of a large-span wide-body bridge cantilever pouring device, including the following steps:

[0020] Step one, assemble two groups of main beams and bottom baskets on both sides of the box girder, and assemble the corresponding side mold, bottom mold and inner mold on the bottom basket first;

[0021] Step two, assemble the hollow filling mechanism with the end mold, and after assembly, assemble the end mold with the side mold, bottom mold and inner mold to form a complete mold system;

[0022] Step three, inflate the corresponding inflation bag through the air passage system to control the inflation of the inflation bag at the corresponding position in the mold system;

[0023] Step four, inject concrete into the mold system through the concrete pouring device;

[0024] Step five, when the amount of concrete injection reaches two-thirds, deflate the inflation bag to make it shrink, and pull out the pre-inserting rod to make the plugging plug seal the end mold;

[0025] Step six, continue to pour the remaining concrete until the pouring is completed.

[0026] The beneficial effects of this invention are as follows: By utilizing the filling of the expansion bladder, the center of gravity of the initially injected concrete can be adjusted, making the concrete in the mold system at both ends of the box girder relatively balanced, reducing the impact of unbalanced torque on the rotation system at the bottom of the pier, and improving construction safety. At the same time, during the initial pouring process, the concrete will gradually fill the bottom space of the pouring space. To avoid the generation of air bubbles, a high-pressure air pump and a venting control valve can be used together to continuously change the inflation and deflation of the expansion bladder, thereby generating continuous changes in expansion and contraction. This can have a certain pushing effect on the surrounding concrete, making the concrete filling more uniform, accelerating the discharge of air bubbles, and improving the pouring quality of the bottom area. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 This is a construction scenario diagram of the present invention.

[0029] Figure 3 This is a diagram showing the state of the mold system injecting concrete in an inclined state according to the present invention.

[0030] Figure 4 This is a diagram showing the working state of the hollow filling mechanism of the present invention.

[0031] Figure 5 This is a schematic diagram of the short rod type pre-insertion rod of the present invention.

[0032] Figure 6 This is an end view of the docking plate of the present invention.

[0033] Figure 7 This is a diagram showing the state of the end mold after the pre-insertion rod is removed from the mold system of the present invention, where the sealing plate seals the end mold.

[0034] Figure 8 This is a schematic diagram of the structure of the long rod type pre-insertion rod of the present invention.

[0035] Figure 9 This is a schematic diagram showing the fit between the improved pre-insertion rod and the docking plate of the present invention.

[0036] Figure 10 This is a diagram showing the state of the ventilated slide bar of the present invention docking with the corresponding expansion bladder and being inflated.

[0037] Figure 11 This is a schematic diagram of the internal cavity of the mold system of the present invention.

[0038] Figure 12 This is a schematic diagram of the structure of the inflatable bladder with a two-sided distribution, as used in this invention.

[0039] Figure 13This is a schematic diagram illustrating the interaction between the two-sided distributed expansion bladders and the corresponding pre-insertion rods of the present invention.

[0040] Figure 14 This is a flowchart of the casting method of the present invention.

[0041] The attached diagram is labeled as follows: 1. Hanging basket system; 11. Main beam; 12. Bottom basket; 2. Mold system; 21. Side mold; 22. Bottom mold; 23. End mold; 231. Receiving groove; 24. Docking seat; 241. Locking assembly; 242. Pressure chamber; 243. Elastic sealing ring; 25. Inner mold; 3. Hollow filling mechanism; 31. Pre-insertion rod; 311. Vent hole; 312. Mounting bracket; 32. Inflation bladder; 33. Docking plate; 331. Positioning sleeve; 332. Elastic pad; 34. Sealing plug; 35. Air passage system; 351. Connecting air gap; 352. First air passage; 353. Second air passage; 36. Vent slide rod; 361. Control handle; 4. Vibrator. Detailed Implementation

[0042] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0043] Refer to the instruction manual appendix Figures 1 to 13 A cantilever casting equipment for a long-span wide-body bridge includes a hanging basket system 1 and a mold system 2. The mold system 2 is installed on the hanging basket system 1. The hanging basket system 1 includes a main beam 11 and a bottom basket 12. The main beam 11 is erected on a pre-formed box girder and is connected to the box girder through a traveling mechanism. Each time one end is cast, the traveling mechanism advances a certain distance. The mold system 2 includes a side mold 21, a bottom mold 22, and an end mold 23. The end mold 23 is located at the ends of the side mold 21 and the bottom mold 22. During actual casting construction, the side mold 21, the bottom mold 22, and the end mold 23 are all installed above the bottom basket 12, forming a casting space with the end of the pre-formed box girder. Concrete is injected into the casting space by a concrete casting device (such as a concrete pump truck) and waits for it to form. Through continuous casting and traveling, the continuous casting of the long-span wide-body cantilever beam can be completed.

[0044] It should be noted that the hanging basket system 1 and mold system 2 used above are common solutions for hanging basket construction. Therefore, their specific structures and assembly schemes are existing technologies. Therefore, this embodiment will not explain them in detail. The difference is that in this embodiment, the end mold 23 is provided with a hollow filling mechanism 3 at the position corresponding to the bottom mold 22. The hollow filling mechanism 3 includes a pre-insertion rod 31. The bottom of the end mold 23 is fixedly connected to a docking seat 24. The pre-insertion rod 31 is inserted into the docking seat 24 and passes through the end mold 23 and extends to the bottom of the pouring space formed by the side mold 21, the bottom mold 22 and the end mold 23. During assembly, care should be taken to avoid the steel cage structure in the pouring space. The pre-insertion rod 31 is preferentially inserted into the gap of the steel cage.

[0045] An expansion bladder 32 is fixedly installed outside the area of ​​the pre-insertion rod 31 within the casting space. An air passage system 35 is provided inside the pre-insertion rod 31. A vent hole 311 is provided on the pre-insertion rod 31 at a position corresponding to the inner cavity of the expansion bladder 32. The vent hole 311 is connected to the air passage system 35. The air passage system 35 is connected to a high-pressure air pump and a venting control valve through a pipe. The high-pressure air pump is used to fill the expansion bladder 32 with high-pressure gas, causing the expansion bladder 32 to expand. The venting control valve is used to discharge the air in the expansion bladder 32, causing the expansion bladder 32 to contract.

[0046] For details, please refer to the instruction manual appendix. Figure 2 and Figure 3 In the mold system 2 located at the lower end, the corresponding expansion bladder 32 is positioned away from the bridge pier, while in the mold system 2 located at the higher end, the corresponding expansion bladder 32 is positioned closer to the bridge pier. Since the working principle of the hollow filling mechanism 3 in this embodiment is the same—both occupy concrete space by pre-expanding the expansion bladder 32, thus changing the center of gravity of the initially injected concrete—this embodiment will only use the mold system 2 located at the lower end as an example for explanation. Please refer to the appendix to the instruction manual. Figure 4 and Figure 5Before actual pouring, the mold system 2 is pre-assembled on the hanging basket system 1, and the pre-insertion rod 31 is inserted into the mold system 2 to control the expansion of the expansion bladder 32. For the hollow filling mechanism 3 at the lower end, the pre-insertion rod 31 can adopt a short rod structure, and the hollow filling mechanism 3 is set near the end mold 23 (for the hollow filling mechanism 3 at the higher end, a long rod pre-insertion rod 31 can be used, and the expansion bladder 32 is set away from the end mold 23). The expansion bladder 32 is inflated by a high-pressure air pump through the air channel system 35, causing the expansion bladder 32 to expand and occupy the space in the mold system 2 away from the end of the pier. Thus, when the concrete is poured, although the concrete will flow to the lower position, the expansion bladder will remain in place at that position. Because of the filling of 32, the center of gravity of the initially injected concrete is mainly biased away from the low end position. Therefore, the position of the center of gravity of the initially injected concrete can be adjusted to make the concrete in the mold system 2 at both ends of the box girder relatively balanced, reduce the impact of unbalanced torque on the rotation system at the bottom of the pier, and improve the safety of construction. At the same time, during the initial pouring process, the concrete will gradually fill the bottom space of the pouring space. To avoid the generation of air bubbles, a high-pressure air pump and a venting control valve can be used together to make the inflation and deflation of the expansion bladder 32 constantly change, thereby producing continuous changes in expansion and contraction. This can have a certain pushing effect on the surrounding concrete, making the concrete filling more uniform and accelerating the discharge of air bubbles, thus improving the pouring quality of the bottom area.

[0047] As the amount of concrete in the mold system 2 gradually increases, its center of gravity will move closer and closer to the center. Therefore, as the amount of concrete increases, the expansion bladder 32 will no longer be needed. When the amount of concrete injected into the mold system 2 is more than two-thirds, the expansion bladder 32 can be completely deflated and subsequent pouring can be carried out. The pre-inserted rod 31 can adopt a lower cost and a thinner overall structure. As a disposable structure, it can be directly retained in the concrete as a pre-embedded structure after the pouring is completed, without the need to be removed.

[0048] Furthermore, to improve operational efficiency, enhance controllability, and reduce construction costs, this embodiment also provides the following technical solutions, specifically as detailed in the appendix to the specification. Figure 8The pre-insertion rod 31 is a long rod structure, and its length is close to the length of the internal casting space of the mold system 2. That is, the pre-insertion rod 31 fills the bottom area of ​​the casting space as much as possible. The expansion bladders 32 are set in multiple groups, and the multiple groups of expansion bladders 32 are arranged sequentially along the length of the pre-insertion rod 31. The pre-insertion rod 31 is equipped with an inflation control mechanism, which is used to control the inflation and deflation of the expansion bladders 32 in the corresponding areas. Thus, the same hollow filling mechanism 3 can be used for both the high and low ends of the mold system 2, reducing the production cost of the hollow filling mechanism 3. In actual use, for the hollow filling mechanism 3 at the low end, the expansion bladders 32 close to the end mold 23 can be selected for inflation, while for the hollow filling mechanism 3 at the high end, the expansion bladders 32 far away from the end mold 23 can be selected for inflation. In addition, during the actual casting process, the expansion bladders 32 at specific locations can be selected for inflation according to the actual casting situation, improving the controllability of the equipment.

[0049] In the above embodiment, the inflation control mechanism includes a venting slide bar 36, which is slidably installed inside the pre-insertion rod 31. The air passage system 35 is formed in the venting slide bar 36. The venting slide bar 36 is provided with multiple sets of connecting air slits 351, which are used to connect with the vent holes 311. The number of connecting air slits 351 is less than the number of inflatable bladders 32.

[0050] By adopting the above scheme, in actual use, the position of the venting slide rod 36 in the inner wall of the pre-insertion rod 31 can be controlled to connect the air vent 351 with the air vent 311 of the corresponding expansion bladder 32, thereby controlling which expansion bladder 32 is inflated. The end of the venting slide rod 36 can be a rigid tube structure, and the air vents 351 are all distributed on the rigid tube structure. The outer end of the venting slide rod 36 uses a flexible tube structure, and the control handle 361 is installed on the flexible tube structure. In actual construction, workers can operate the venting slide rod 36 on the walkway system of the hanging basket system 1 to control its extension range. Alternatively, the entire venting slide rod 36 can be set as a rigid tube and its extension and retraction can be controlled by the telescopic control mechanism, but this will take up more space.

[0051] Furthermore, to improve the utilization of the hollow filling mechanism 3, the pre-insertion rod 31 can be detachably connected to the end mold 23. For details, please refer to the appendix of the instruction manual. Figures 5 to 9The pre-insertion rod 31 is equipped with a docking plate 33, which docks with the docking seat 24. The docking seat 24 is provided with a locking assembly 241 for locking the docking plate 33. For example, the locking assembly 241 is a rotating locking structure. When the pre-insertion rod 31 is installed, rotating the locking assembly locks the edge of the docking plate 33 to fix the pre-insertion rod 31. Alternatively, bolts or other structures can be used for installation. When the slack concrete is poured to more than two-thirds, the locking assembly 241 can be released and the pre-insertion rod 31 can be pulled out. The pre-insertion rod 31 itself slides through the docking seat 24 and the end mold 23, so no large amount of concrete leakage will be caused when it is pulled out.

[0052] Furthermore, a sealing plug 34 is provided at one end of the pre-insertion rod 31 within the casting space of the mold system 2. The sealing plug 34 is detachably connected to the pre-insertion rod 31. A receiving groove 231 for accommodating the sealing plug 34 is provided on the inner side wall of the end mold 23 at the position corresponding to the pre-insertion rod 31. The sealing plug 34 can be connected to the pre-insertion rod 31 using a threaded rod structure (or other easily detachable connection structure), and the threaded rod is inserted into the pre-insertion rod 31. The pre-insertion rod 31 can be a round rod structure. The sealing plug 34 and the receiving groove 231 are connected... The system is equipped with a locking structure that restricts the rotation of the sealing plug 34. Before pouring, the pre-insertion rod 31 is passed through the end mold 23. The sealing plug 34 is then assembled with the pre-insertion rod 31, and the end mold 23 is then assembled. When it is necessary to remove the pre-insertion rod 31, the locking assembly 241 is released first, and the pre-insertion rod 31 is pulled out, so that the sealing plug 34 is inserted into the receiving groove 231, thus sealing the hole. After that, the sealing plug 34 cannot rotate. At this time, rotating the pre-insertion rod 31 can release the connection to the sealing plug 34, thereby removing the pre-insertion rod 31.

[0053] It should be noted that in the above embodiment, the exposed part of the pre-insertion rod 31 fits against the end mold 23 and the docking seat 24, and the expansion bladder 32, after shrinking, also fits against the pre-insertion rod 31. The position of the pre-insertion rod 31 corresponding to the expansion bladder 32 is set with a groove structure. After the expansion bladder 32 shrinks, the outer wall of the expansion bladder 32 matches the outer wall of the pre-insertion rod 31. Thus, when the expansion bladder 32 passes through the end mold 23 and the docking seat 24, it can also fit tightly. Moreover, the expansion bladder 32 itself is elastic. When the pre-insertion rod 31 is pulled out, some air can be retained in the expansion bladder 32, and the venting control valve can be closed, so that the expansion bladder 32 will expand slightly, improving the sealing performance of the end mold 23 when the pre-insertion rod 31 is pulled out.

[0054] Furthermore, to further improve the sealing effect when the pre-insertion rod 31 is withdrawn, a pressure chamber 242 is provided inside the docking seat 24, and an elastic sealing ring 243 is provided in the pressure chamber 242. The elastic sealing ring 243 is used for sliding cooperation with the outer wall of the pre-insertion rod 31. The elastic sealing ring 243 has a ring structure. An oil injection pipe is connected to the pressure chamber 242, and the oil injection pipe is connected to an oil injection pump. By pressurizing the pressure chamber 242 through the oil injection pump, the squeezing effect of the elastic sealing ring 243 on the pre-insertion rod 31 can be improved, thereby improving the sealing effect when the pre-insertion rod 31 is withdrawn.

[0055] Furthermore, a positioning sleeve 331 is provided in the docking plate 33. The positioning sleeve 331 is snapped onto the outside of the pre-insertion rod 31. An elastic pad 332 is provided between the positioning sleeve 331 and the pre-insertion rod 31. One end of the pre-insertion rod 31 located outside the end mold 23 is fixedly connected to a mounting bracket 312. The mounting bracket 312 is used to install the vibrator 4.

[0056] It should be noted that, since the pre-inserted rod 31 extends to the bottom of the pouring space in the early stage of pouring, and due to the presence of the reinforcing cage, it is difficult for construction workers to accurately and quickly extend the traditional vibrator 4 to the bottom of the concrete for vibration. Therefore, a set of vibrators 4 can be installed at the outer end of the pre-inserted rod 31 to directly vibrate the pre-inserted rod 31 during pouring, thereby indirectly vibrating the pre-inserted rod 31 at the bottom of the concrete, improving the pouring efficiency and pouring quality of the concrete.

[0057] Refer to the instruction manual appendix Figure 11 The box girder structure also includes an inner chamber, meaning the box girder is a hollow structure like a box. Therefore, during actual construction, the mold system 2 also includes an inner mold 25, which is located within the side mold 21 and the bottom mold 22. The area between the bottom of the inner mold 25 and the bottom mold 22 forms a relatively sealed state. Especially for structures with a wide volume and a wide inner chamber, the span of the relatively sealed area is large. During the actual pouring process, the air is mainly expelled upwards, but the top of the relatively sealed area is affected by the bottom of the inner mold 25, making it difficult for air to escape vertically. Therefore, air bubbles are easily formed during actual pouring, affecting the poured structure. The surface quality is poor, and in severe cases, large bubbles can even affect the structural quality of the box girder. In the above embodiment, each set of expansion bladders 32 can adopt a single-unit structure, that is, the expansion bladders 32 are arranged around the outside of the pre-insertion rods 31. When the expansion bladders 32 expand, they are close to a spherical or cylindrical shape. When they expand and contract, they can drive the surrounding concrete to move. However, since the expansion is mainly in the circumferential direction, the movement of the concrete in the left and right directions is not concentrated, and the driving effect on the bubbles is poor. Therefore, the hollow filling mechanism 3 used in the area between the bottom of the inner mold 25 and the end mold 23 needs to be further improved. For details, please refer to the appendix of the instruction manual. Figures 11 to 13Each set of inflatable bladders 32 consists of two bladders, each installed on one side of a pre-insertion rod 31. Ventilation holes 311 are provided on both sides of the pre-insertion rod 31. A venting slide rod 36 is rotatably installed within the pre-insertion rod 31. The airway system 35 includes a first airway 352 and a second airway 353. Both the first and second airways 352 and 353 have connecting air slits 351 for connecting with the ventation holes 311. The first airway 352 is connected to a high-pressure air pump, and the second airway 353 is connected to a venting control valve. The venting slide rod 36 is a rigid rod structure. A control handle 361 is slidably sleeved on the outside of the venting slide rod 36. A sliding guide structure, such as a sliding key or spline structure, is provided between the venting slide rod 36 and the hollow filling mechanism 3. The hollow filling mechanism 3 also includes a rotation controller for driving the control handle 361 to rotate, which can also be manually controlled. In actual use, by controlling the rotation of the venting slide rod 36, the docking sequence of the first air passage 352 and the second air passage 353 with the expansion bladders 32 on both sides can be adjusted, thereby realizing the alternating expansion and contraction of the expansion bladders 32 on the left and right sides, thereby maximizing the left and right pushing of the concrete, causing it to flow in the horizontal direction, accelerating the movement of air bubbles to both sides, and discharging them from the area between the inner mold 25 and the side mold 21, thereby improving the efficiency of air bubble discharge.

[0058] Refer to the instruction manual appendix Figure 14 The present invention also provides a method for cantilever casting of long-span wide-body bridges, comprising the following steps:

[0059] Step 1: Assemble the two sets of main beams 11 and bottom baskets 12 on both sides of the box girder, and assemble the corresponding side molds 21, bottom molds 22 and inner molds 25 onto the bottom baskets 12.

[0060] Step 2: Assemble the hollow filling mechanism 3 with the end mold 23. After assembly, assemble the end mold 23 with the side mold 21, bottom mold 22 and inner mold 25 to form a complete mold system 2.

[0061] Step 3: Inflate the corresponding expansion bladder 32 through the air passage system 35 to control the expansion of the expansion bladder 32 at the corresponding position in the mold system 2.

[0062] Step 4: Inject concrete into mold system 2 using the concrete pouring device;

[0063] Step 5: When the concrete injection reaches two-thirds, deflate the expansion bladder 32 to make it shrink, and pull out the pre-insertion rod 31 so that the sealing plug 34 seals the end mold 23.

[0064] Step 6: Continue pouring the remaining concrete until the pouring is complete.

[0065] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A cantilever casting device for a long-span wide-body bridge, comprising a hanging basket system (1) and a mold system (2), wherein the mold system (2) is installed on the hanging basket system (1), the hanging basket system (1) comprising a main beam (11) and a bottom basket (12), and the mold system (2) comprising a side mold (21), a bottom mold (22), an end mold (23), and an inner mold (25), wherein the end mold (23) is disposed at the ends of the side mold (21) and the bottom mold (22), characterized in that: A hollow filling mechanism (3) is provided at the position of the end mold (23) corresponding to the bottom mold (22). The hollow filling mechanism (3) includes a pre-insertion rod (31). A docking seat (24) is fixedly connected to the bottom of the end mold (23). The pre-insertion rod (31) is inserted into the docking seat (24), and the pre-insertion rod (31) penetrates the end mold (23) and extends to the bottom of the casting space of the mold system (2). The pre-insertion rod (31) is fixedly installed outside the area within the casting space with an expansion bladder (32). An air passage system (35) is provided inside the pre-insertion rod (31). A vent hole (311) is provided on the pre-insertion rod (31) at a position corresponding to the inner cavity of the expansion bladder (32). The vent hole (311) is connected to the air passage system (35). The air passage system (35) is connected to an air pump and a venting control valve through a pipe. The air pump is used to fill the expansion bladder (32) with gas to make the expansion bladder (32) expand. The venting control valve is used to discharge the air in the expansion bladder (32) to make the expansion bladder (32) contract.

2. The cantilever casting equipment for long-span wide-body bridges according to claim 1, characterized in that: The pre-insertion rod (31) is a long rod structure, and the expansion bladder (32) is set in multiple groups. The multiple groups of expansion bladders (32) are arranged sequentially along the length direction of the pre-insertion rod (31). The pre-insertion rod (31) is equipped with an inflation control mechanism, which is used to control the inflation and deflation of the expansion bladders (32) in the corresponding area.

3. The cantilever casting equipment for long-span wide-body bridges according to claim 2, characterized in that: The inflation control mechanism includes a venting slide rod (36), which is slidably installed inside the pre-insertion rod (31). The airway system (35) is formed in the venting slide rod (36). The venting slide rod (36) is provided with multiple sets of connecting air slits (351), which are used to connect with the vent holes (311). The number of connecting air slits (351) is less than the number of expansion bladders (32). The venting slide rod (36) is provided with a control handle (361).

4. The cantilever casting equipment for long-span wide-body bridges according to claim 3, characterized in that: The pre-insertion rod (31) is equipped with a docking plate (33), which docks with the docking seat (24). The docking seat (24) is provided with a locking assembly (241) for locking the docking plate (33).

5. The cantilever casting equipment for long-span wide-body bridges according to claim 4, characterized in that: The pre-insertion rod (31) is provided with a sealing plug (34) at one end within the mold system (2). The sealing plug (34) is detachably connected to the pre-insertion rod (31). The inner side wall of the end mold (23) is provided with a receiving groove (231) for accommodating the sealing plug (34) at the position corresponding to the pre-insertion rod (31).

6. The cantilever casting equipment for long-span wide-body bridges according to claim 5, characterized in that: The docking seat (24) is provided with a pressure chamber (242), and an elastic sealing ring (243) is provided in the pressure chamber (242). The elastic sealing ring (243) is used to slide with the outer wall of the pre-insertion rod (31). The elastic sealing ring (243) is a ring structure. An oil injection pipe is connected to the pressure chamber (242), and the oil injection pipe is connected to the oil injection pump.

7. The cantilever casting equipment for long-span wide-body bridges according to claim 6, characterized in that: The docking plate (33) is provided with a positioning sleeve (331), which is engaged and installed on the outside of the pre-insertion rod (31). An elastic pad (332) is provided between the positioning sleeve (331) and the pre-insertion rod (31). One end of the pre-insertion rod (31) located outside the end mold (23) is fixedly connected to a mounting bracket (312), which is used to install the vibrator (4).

8. The cantilever casting equipment for long-span wide-body bridges according to claim 7, characterized in that: Each group of the expansion bladders (32) is configured as one, and the expansion bladders (32) are circular structures and are arranged around the outside of the pre-insertion rod (31).

9. The cantilever casting equipment for long-span wide-body bridges according to claim 7, characterized in that: Each set of inflatable bladders (32) consists of two bladders, which are respectively installed on both sides of the pre-insertion rod (31). Ventilation holes (311) are provided on both sides of the pre-insertion rod (31). The ventilation slide rod (36) is rotatably installed in the pre-insertion rod (31). The airway system (35) includes a first airway (352) and a second airway (353). Each of the components is provided with a connecting air slit (351) for docking with the vent (311). The first air passage (352) is connected to the air pump, and the second air passage (353) is connected to the vent control valve. The control handle (361) is slidably sleeved on the outside of the vent slide rod (36), and a sliding guide structure is provided between the control handle (361) and the vent slide rod (36). The hollow filling mechanism (3) also includes a rotation controller for driving the control handle (361) to rotate.

10. A casting method for a cantilever casting device for a long-span, wide-body bridge as described in claim 7, characterized in that: Includes the following steps: Step 1: Assemble the two sets of main beams (11) and bottom baskets (12) on both sides of the box beam, and assemble the corresponding side molds (21), bottom molds (22) and inner molds (25) onto the bottom baskets (12); Step 2: Assemble the hollow filling mechanism (3) and the end mold (23). After assembly, assemble the end mold (23) with the side mold (21), bottom mold (22) and inner mold (25) to form a complete mold system (2). Step 3: Inflate the corresponding expansion bladder (32) through the air passage system (35) to control the expansion of the expansion bladder (32) at the corresponding position in the mold system (2); Step 4: Inject concrete into the mold system (2) using a concrete pouring device; Step 5: When the concrete injection reaches two-thirds, the expansion bladder (32) is deflated to shrink it, and the pre-insertion rod (31) is pulled out so that the sealing plug (34) seals the end mold (23); Step 6: Continue pouring the remaining concrete until the pouring is complete.

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