Cast-in-place support for the 0# block of the concrete beam of a cable-stayed bridge and construction method

Abstract

The present application discloses a cast-in-place support for the 0# block of a concrete beam of a cable-stayed bridge, which includes a bracket seat, a bracket frame, a beam frame and a preloading frame. The bracket seat is connected to the main tower through embedded parts. One side of the bracket frame is connected to the bracket seat. The beam frame is installed on the upper part of the bracket frame. A plurality of suspension ropes are connected to the beam frame. One end of the suspension rope away from the beam frame extends to the ground. The preloading frame is connected to the end of the suspension rope away from the beam frame. A buoyancy member is installed at the bottom of the preloading frame, and there is a gap between the buoyancy member and the bearing platform. During construction, a water tank is used to provide buoyancy to the buoyancy member, so that the preloading materials can be pre-loaded onto the preloading frame at one time. Then, the preloading frame together with the preloading materials is hoisted into the water tank, and the loading and unloading loads are controlled by controlling the water level of the water tank. The present application has the effects of facilitating the hoisting of loading materials and facilitating the control of loading and unloading loads.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction, and in particular to a cast-in-place support for the 0# block of a concrete beam of a cable-stayed bridge and a construction method thereof. Background Art

[0002] When constructing the 0# block of a cable-stayed bridge, the support platform formed by splicing pier body embedded parts and steel profiles is usually called a bracket. After the bracket is assembled, it is necessary to preload the bracket to eliminate non-elastic deformation and measure the elastic deformation value under the corresponding load to test the stress condition of the members and the stability of the entire bracket. When formwork erection is carried out, the corresponding camber is considered according to the preloading result.

[0003] In the related art, sandbags are used for loading preloading. The sandbags are hoisted in batches from the ground to above the bracket in the air and then loaded onto the bracket in areas. After the preloading is completed, the sandbags are hoisted from the bracket to the ground. The hoisting of the sandbags is inconvenient, and it is not conducive to controlling the symmetrical and uniform loading and unloading of the dead weight load.

[0004] In view of the above related art, the applicant believes that there are the following defects: the hoisting of the loading materials is inconvenient, and it is not conducive to controlling the symmetrical and uniform loading and unloading of the dead weight load. Summary of the Invention

[0005] In order to facilitate the hoisting of the loading materials and control the symmetrical and uniform loading and unloading of the dead weight load, the present application provides a cast-in-place support for the 0# block of a concrete beam of a cable-stayed bridge and a construction method thereof.

[0006] In a first aspect, a cast-in-place support for the 0# block of a concrete beam of a cable-stayed bridge provided by the present application adopts the following technical solution:

[0007] A cast-in-place support for the 0# block of a concrete beam of a cable-stayed bridge includes a bracket seat, a bracket frame, a beam frame and a preloading frame. The bracket seat is connected to the main tower through embedded parts. One side of the bracket frame is connected to the bracket seat. The beam frame is installed on the upper part of the bracket frame. A plurality of suspension ropes are connected to the beam frame. The end of the suspension rope far from the beam frame extends to the bearing platform. The preloading frame is connected to the end of the suspension rope far from the beam frame. A buoyancy member is installed at the bottom of the preloading frame, and a gap is left between the buoyancy member and the bearing platform.

[0008] By adopting the above technical solution, the preloading frame is arranged close to the bearing platform. After the bracket seat, the bracket frame and the beam frame are installed, the loading preloading can be carried out on the ground. The preloading materials do not need to be hoisted onto the beam frame and then hoisted from the beam frame to the ground, reducing the hoisting time of the preloading materials. Moreover, the preloading materials are carried on the ground, which is convenient and fast, reducing the risk of high-altitude operations. Through a plurality of suspension ropes, various parts of the beam frame can be connected, so that the pressure of the preloading frame can be dispersed to various parts of the beam frame, and the preloading effect is good.

[0009] In the second aspect, the present application provides a cable-stayed bridge concrete beam 0# block cast-in-place bracket and construction method adopting the following technical solution:

[0010] A construction method for a cast-in-place support for a 0# block of a cable-stayed bridge concrete beam comprises the following steps:

[0011] Install each of the corbel seats to the embedded parts on the main tower, then install the corbel frame on the corresponding corbel seat, then install the beam frame on the corbel frame, and tie the suspension rope on the beam frame according to the designed position;

[0012] A water pool is built on the supporting platform, the water pool surrounds the main tower, a water drain port is provided at the bottom of the water pool, a water drain valve is installed in the water drain port, and then water is injected into the water pool;

[0013] The prestressing material is piled on the prestressing frame to a designed load, and then the prestressing frame is hoisted into the water pool by a crane, and the prestressing frame floats above the water surface of the water pool, and then the prestressing frame is moved to a set position and connected to the corresponding hoisting rope;

[0014] Open the drain valve to drain the pool, start loading and pre-pressing until the water level in the pool is lower than the lower part of the buoyancy member, and then close the drain valve;

[0015] After the pre-pressing time reaches the preset time, water is poured into the water pool to start unloading until the water level in the water pool rises to the set height, and the connection between the pre-pressing frame and the suspension rope is released;

[0016] The pre-stressing frame is lifted out of the water pool by a crane, the drain valve is opened, the water in the water pool is drained, and finally the water pool is dismantled.

[0017] By adopting the above technical scheme, the prestressing material is piled on the prestressing frame to the designed load at one time, and then the prestressing frame and the prestressing material are hoisted to the pool together, without the need to transport the prestressing material in batches, and the prestressing material can be piled on the prestressing frame in advance, which is convenient for operation, improves construction efficiency, and saves construction time; the water is drained through the drain valve to reduce the buoyancy of the water on the prestressing frame, so that the force of the prestressing frame on the beam frame gradually increases, and the loading of the prestressing force is controllable. The flow rate of the prestressing force can be controlled by controlling the flow of the drain valve according to actual needs, and the operation is convenient; after closing the drain valve, water is poured into the pool to gradually increase the buoyancy of the prestressing frame, and then the prestressing force can be gradually unloaded; the prestressing force at various places of the beam frame can be loaded and unloaded symmetrically, evenly, and synchronously, and the prestressing effect is good and the precision is high.

[0018] Preferably, the method for building the water pool is as follows: Use partitions to build a pool wall around the main tower on the bearing platform, then lay a waterproof cloth between the pool wall and the main tower. The waterproof cloth surrounds the main tower for at least one circle. One end of the waterproof cloth is fixedly connected to the upper end of the partition, and the other end of the waterproof cloth is fixedly connected to the main tower. The drain valve is installed on the waterproof cloth and penetrates through the partition.

[0019] By adopting the above technical solution, since the water pool is only used during the preloading process and is no longer needed after the preloading is completed, the water pool is built with partitions and a waterproof cloth, which can be easily built and demolished, with high construction efficiency and low cost.

[0020] Preferably, reinforcing frames are respectively installed at both ends of the pool wall. A number of columns are installed between the two reinforcing frames. A reinforcing ring is installed at the main tower near the bearing platform. A reinforcing rod is installed between the lower reinforcing frame and the reinforcing ring.

[0021] By adopting the above technical solution, the reinforcing frames, columns, reinforcing rings and reinforcing rods improve the stability of the water pool and reduce the risk of the water pool collapsing.

[0022] Preferably, a plurality of diagonal braces distributed around the pool wall are installed on the outer side of the pool wall. One end of the diagonal brace is connected to the upper reinforcing frame, and the other end of the diagonal brace abuts against the bearing platform.

[0023] By adopting the above technical solution, the diagonal braces can reduce the probability of the partition being crushed outward, reduce the inclination probability of the partition, and maintain the stable volume of the water pool.

[0024] Preferably, the end of the waterproof cloth connected to the main tower is higher than the end of the waterproof cloth connected to the partition. The waterproof cloth is pasted on the main tower with adhesive to form a seal.

[0025] By adopting the above technical solution, if the water in the water pool overflows, it will flow out from the side wall of the water pool to prevent water leakage at the connection between the waterproof cloth and the main tower, causing water accumulation below the waterproof cloth.

[0026] Preferably, the bottom and the surrounding of the preloading frame are closed with sealing plates.

[0027] By adopting the above technical solution, the preloading material is isolated from water, avoiding the preloading material being moistened by water, resulting in a change in weight, and thus causing a large error in the preloading result.

[0028] Preferably, a pressure bar is installed above the beam frame. The pressure bar straddles above the lower cross beam of the main tower. A pressure block is connected in the middle of the pressure bar. The pressure block is connected to the beam frame. The two ends of the pressure bar are located outside the horizontal projection of the main tower and are respectively connected to a suspension rope.

[0029] By adopting the above technical solution, the load of the preloading frame is transmitted to the beam frame through the suspension ropes, pressure bars and pressure blocks, and the load can be transmitted to the beam frame at the position interfered by the main tower.

[0030] In summary, the present application at least includes the following beneficial technical effects:

[0031] 1. The preloading frame is arranged near the bearing platform. After the bracket seat, bracket frame and beam frame are installed, the loading preloading can be carried out on the ground. The preloading materials do not need to be hoisted onto the beam frame and then hoisted from the beam frame to the ground, reducing the hoisting time of the preloading materials. Moreover, the preloading materials are carried on the ground, which is convenient and fast, reducing the risk of working at height. The beam frame can be connected at various places through multiple suspension ropes, so that the pressure of the preloading frame can be dispersed to various places of the beam frame, and the preloading effect is good;

[0032] 2. The present application can stack the preloading materials on the preloading frame at one time to the design load, and then lift the preloading frame and the preloading materials together into the water tank, without transporting the preloading materials in batches. Moreover, the preloading materials can be pre-stacked on the preloading frame in advance, which is convenient for operation, improves the construction efficiency and saves the construction time; By draining water through the drain valve, the buoyancy of the water on the preloading frame is reduced, so that the acting force of the preloading frame on the beam frame gradually increases, and the loading of the preloading force is controllable. By controlling the flow rate of the drain valve according to actual needs, the loading rate of the preloading force can be controlled, and the operation is convenient; After closing the drain valve, inject water into the water tank to gradually increase the buoyancy on the preloading frame, and then the unloading can be gradually carried out; The preloading forces at various places of the beam frame can be loaded and unloaded symmetrically, evenly and synchronously, and the preloading effect is good and the accuracy is high. Description of the Drawings

[0033] Figure 1 is a schematic diagram after the installation of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge in the embodiment of the present application.

[0034] Figure 2 is a structural schematic diagram of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge in the embodiment of the present application.

[0035] Figure 3 is a construction schematic diagram of the construction method of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge in the embodiment of the present application.

[0036] Figure 4 is a structural schematic diagram of the water tank in the embodiment of the present application (the waterproof cloth is hidden).

[0037] Figure 5 is an installation schematic diagram of the pressure bar and the pressure block in the embodiment of the present application.

[0038] Description of the Reference Numerals:

[0039] 1. Corbels; 2. Corbel frames; 3. Beam frames; 4. Preloading frames; 5. Buoyancy members; 6. Suspension ropes; 7. Main towers; 8. Pools; 81. Partition boards; 82. Waterproof cloths; 83. Drain valves; 84. Diagonal braces; 85. Reinforcing frames; 86. Columns; 87. Reinforcing rings; 88. Reinforcing bars; 9. Press rods; 10. Press blocks. Detailed implementation manners

[0040] The following further elaborates on this application in conjunction with the attached Figures 1-5 drawings.

[0041] The embodiment of this application discloses a cast-in-place support for the 0# block of a cable-stayed bridge concrete beam.

[0042] Embodiment 1

[0043] Referring to Figure 1 and Figure 2 , a cast-in-place support for the 0# block of a cable-stayed bridge concrete beam includes multiple corbels 1, corbel frames 2, beam frames 3, and preloading frames 4. Multiple corbels 1 are all connected to the main tower 7 through embedded parts. The embedded parts use embedded bolts, and the corbels 1 can be firmly installed by cooperating nuts with the embedded bolts. To improve the firmness of the corbels 1, the corbels 1 and the embedded parts can also be welded. One side of the corbel frame 2 is connected to the corbel 1, and the upper part of the corbel 1 extends above the lower crossbeam of the main tower 7. The beam frame 3 is arranged above the lower crossbeam of the main tower 7. The beam frame 3 is fixedly installed on the upper part of the corbel frame 2. The middle part of the beam frame 3 is fixedly connected to the lower crossbeam of the main tower 7 through embedded bolts. A cushion block is installed between the beam frame 3 and the lower crossbeam of the main tower 7, and the cushion block increases the supporting area of the lower crossbeam of the main tower 7 for the beam frame 3. Multiple suspension ropes 6 are connected to the beam frame 3. The distance between adjacent suspension ropes 6 is not less than 20 cm. Multiple suspension ropes 6 tie the beam frame 3 according to the designed positions. The more the suspension ropes 6 are, the better the preloading effect. The number of suspension ropes 6 is set according to the actual situation. The suspension ropes 6 avoid the main tower 7, and the lower ends of the suspension ropes 6 extend to the bearing platform. The preloading frame 4 is connected to the lower ends of the suspension ropes 6. A buoyancy member 5 is installed at the bottom of the preloading frame 4. There is a gap between the buoyancy member 5 and the bearing platform. The buoyancy member 5 is an airbag or a floating plate made of foam plastic.

[0044] The implementation principle of the cast-in-place support for the 0# block of a cable-stayed bridge concrete beam in the embodiment of this application is as follows: The preloading frame 4 is arranged near the bearing platform. Preloading materials can be loaded onto the preloading frame 4 on the bearing platform, which is convenient and fast. There is no need to hoist the preloading materials to a high altitude, reducing the high-altitude operation time, improving safety, and at the same time reducing the hoisting time of the preloading materials and improving the construction efficiency. Through multiple suspension ropes 6, various parts of the beam frame 3 can be connected, enabling the pressure of the preloading frame 4 to be dispersed to various parts of the beam frame 3, and the preloading effect is good.

[0045] The embodiment of this application also discloses a construction method for the cast-in-place support for the 0# block of a cable-stayed bridge concrete beam.

[0046] Reference Figure 3 and Figure 4 , a construction method for the cast-in-place support of the 0# block of the concrete beam of a cable-stayed bridge includes the following steps:

[0047] S1. Install each corbel seat 1 on the embedded parts on the main tower 7, then fixedly install the corbel frame 2 on the corresponding corbel seat 1, and then install the beam frame 3 on the corbel frame 2, and fixedly connect the beam frame 3 to the embedded parts on the lower crossbeam of the main tower 7. Tie the lifting ropes 6 on the beam frame 3 according to the design position. The lifting ropes 6 avoid the main tower 7 and drop to the bearing platform, that is, the lifting ropes 6 drop from the front and back sides of the main tower 7.

[0048] S2. Use the partition board 81 to form a frame around the main tower 7 on the bearing platform. The partition board 81 is made of wood boards. The waterproof cloth 82 is laid between the pool wall and the main tower 7. The waterproof cloth 82 surrounds the main tower 7 for at least one circle. One end of the waterproof cloth 82 crosses the upper end of the partition board 81 and is pasted on the outer wall of the partition board 81 with glue. The other end of the waterproof cloth 82 is pasted on the side wall at the lower end of the main tower 7 with glue. The end of the waterproof cloth 82 pasted on the main tower 7 is higher than the upper end of the partition board 81. The partition board 81, the waterproof cloth 82 and the main tower 7 form an annular pool 8. The partition board 81 surrounds to form the pool wall, and the waterproof cloth 82 serves as the waterproof layer to prevent water leakage. A drain valve 83 is connected to the lower part of the waterproof cloth 82. The drain valve 83 is a flow valve. A drain outlet is provided at the lower part of the partition board 81. The drain valve 83 passes through the drain outlet. Reinforcing frames 85 are respectively installed at the upper end and the lower end of the partition board 81. A number of upright columns 86 are installed between the two reinforcing frames 85. The partition board 81 is fixed on the reinforcing frames 85. A reinforcing ring 87 is installed at the place where the main tower 7 is close to the bearing platform. The reinforcing ring 87 is composed of two semi-rings connected by bolts and nuts. The reinforcing ring 87 holds the main tower 7 tightly. A reinforcing rod 88 is installed between the lower reinforcing frame 85 and the reinforcing ring 87. The two ends of the reinforcing rod 88 are respectively fixedly connected to the reinforcing frame 85 and the reinforcing ring 87. The partition board 81, the reinforcing frames 85, the upright columns 86, the reinforcing ring 87 and the reinforcing rod 88 are all connected by bolts and nuts for easy disassembly. The reinforcing frames 85, the upright columns 86, the reinforcing ring 87 and the reinforcing rod 88 improve the stability of the pool 8 as the skeleton of the pool 8. A number of diagonal bracing rods 84 distributed around the pool wall are installed on the outside of the partition board 81. The diagonal bracing rods 84 are made of wooden rods. One end of the diagonal bracing rod 84 is connected to the upper reinforcing frame 85 by screws, and the other end of the diagonal bracing rod 84 abuts against the bearing platform. The diagonal bracing rod 84 prevents the upper end of the partition board 81 from tilting outwards. The leakage space gap of the waterproof cloth 82 at the connection between the main tower 7 and the bearing platform and at the connection between the pool wall and the bearing platform is not greater than 5 mm to prevent the waterproof cloth 82 from being damaged or falling off under water pressure. After the pool 8 is built, water is injected into the pool 8 to reach the designed amount. The drain valve 83 is installed on the waterproof cloth 82, and the drain valve 83 passes through the partition board 81.

[0049] S3. Load the prestressing material in the prestressing frame 4 to the designed load. The sum of the designed load and the weight of the prestressing frame 4 is equal to the designed maximum prestressing load. The prestressing frame 4 can be loaded with prestressing materials in the factory and then transported to the pedestal, or it can be loaded on the pedestal. There are two prestressing frames 4. Then use a crane to hoist the two prestressing frames 4 loaded with prestressing materials into the pool 8 respectively. Due to the buoyancy of the buoyancy member 5, the prestressing frame 4 floats above the water surface of the pool 8. Then move the prestressing frame 4 to the set position. The two prestressing frames 4 are respectively arranged on both sides of the main tower 7. The prestressing frames 4 are connected to the corresponding lifting ropes 6, and all lifting ropes 6 should be tightened. During the connection of the lifting ropes 6, a level meter is installed on the prestressing frame 4. The level of the prestressing frame 4 is observed through the level meter. If the level of the prestressing frame 4 does not meet the requirements, the tightness of the corresponding lifting rope 6 is adjusted to make the level of the prestressing frame 4 meet the requirements. Multiple measuring points are arranged on the beam frame 3 and marked with red paint.

[0050] S4, open the drain valve 83, drain the pool 8, and start loading preloading. In the initial stage of drainage, if the levelness of the preloading frame 4 does not meet the requirements or some of the suspension ropes 6 are loose and some of the suspension ropes 6 are tight, close the drain valve 83, tighten all the suspension ropes 6, and adjust the levelness of the preloading frame 4 to meet the requirements, and then open the drain valve 83 to continue draining. During the loading process, close the drain valve 83 and the drain valve as needed to meet the requirements of the preloading process and preloading time. After the water surface in the pool 8 is lower than the lower part of the buoyancy member 5, close the drain valve 83. After the loading preloading starts, observe and record the settlement of each measuring point.

[0051] S5, after the pre-pressing time reaches the preset time, water is poured into the water pool 8 to start unloading. During the unloading process, water is stopped and started as needed to meet the requirements of the unloading process and unloading time. After the water level in the water pool 8 rises to the set height, the connection between the pre-pressing frame 4 and the suspension rope 6 is released.

[0052] S6, use a crane to lift the pre-stressing frame 4 out of the pool 8, and transport it away as a whole so that it can be used again next time. Then open the drain valve 83, drain the water in the pool 8, and dismantle the pool 8.

[0053] It should be noted that, refer to Figure 5, since the lower cross beam of the main tower 7 obstructs the sling 6 from connecting to the beam frame 3 directly above the lower cross beam of the main tower 7, the sling 6 cannot directly connect to a part of the beam frame 3 directly above the lower cross beam of the main tower 7. To improve the preloading effect and distribute the applied load to a part of the beam frame 3 directly above the lower cross beam of the main tower 7, a pressure bar 9 is installed above the beam frame 3. A pressure block 10 is fixedly provided in the middle of the pressure bar 9. The pressure block 10 presses against the beam frame 3 directly above the lower cross beam of the main tower 7. The pressure block 10 is fixedly connected to the beam frame 3 by bolts and nuts. The pressure bar 9 does not contact the beam frame 3. The two ends of the pressure bar 9 extend outside the horizontal projection of the main tower 7, and the two ends of the pressure bar 9 are respectively tied to the sling 6. The load of the preloading frame 4 acts on the pressure bar 9 and is then conducted to the beam frame 3 directly above the lower cross beam of the main tower 7 through the pressure block 10.

[0054] In addition, to facilitate the connection between the preloading frame 4 and the sling 6, multiple horizontal bars arranged vertically and horizontally are provided on the upper part of the preloading frame 4. The horizontal bars are square bars, and the distance between the horizontal bars allows preloading materials to be placed into the preloading frame 4. A long groove along the length direction is provided on the horizontal bar, and several bolts are installed in the long groove. Nuts are installed at the lower ends of the bolts, and lifting rings are connected to the upper ends of the bolts. The lower end of the sling 6 is fixedly connected to the lifting ring. By rotating the nuts, the tightness of the sling 6 can be adjusted, so that the load distribution of the preloading frame 4 is more uniform. To prevent the preloading materials from being wetted by water and affecting the weight, the bottom and the surrounding of the preloading frame 4 are closed by sealing plates, which can waterproof the preloading materials inside the preloading frame 4.

[0055] The construction method of the cast-in-place support for the 0# block of the cable-stayed bridge concrete beam in the above-mentioned embodiment is applicable to the environments where the bearing platform is on the ground and the bearing platform is exposed above the water surface. If the bearing platform is submerged underwater in a river or the ocean, there is no need to build a water tank 8, but instead, a ship is driven to the lower part of the beam frame 3 to be used as the water tank 8.

[0056] The implementation principle of the construction method of the cast-in-place support for the 0# block of the cable-stayed bridge concrete beam in the embodiment of the present application is as follows: Preloading materials are piled onto the preloading frame 4 at one time until the designed load, and then the preloading frame 4 and the preloading materials are lifted together into the water tank 8. There is no need to transport the preloading materials in batches, and the preloading materials can be piled onto the preloading frame 4 in advance, which is convenient for operation, improves the construction efficiency, and saves construction time. By draining water through the drain valve 83, the buoyancy of the water on the preloading frame 4 is reduced, so that the acting force of the preloading frame 4 on the beam frame 3 gradually increases, and the loading of the preloading force is controllable. By controlling the flow rate of the drain valve 83 according to actual needs, the loading rate of the preloading force can be controlled, and the operation is convenient. After closing the drain valve 83, water is injected into the water tank 8 to gradually increase the buoyancy on the preloading frame 4, and then unloading can be gradually carried out. The preloading forces at various parts of the beam frame 3 can be loaded and unloaded symmetrically, evenly, and synchronously, with high precision and good preloading effect.

[0057] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A construction method for cast-in-place bracket of concrete beam block 0 of cable-stayed bridge, Features: The invention comprises a cast-in-place support for a concrete beam block 0# of a cable-stayed bridge, comprising a corbel seat (1), a corbel frame (2), a beam frame (3) and a prestressing frame (4), wherein the corbel seat (1) is connected to a main tower (7) via an embedded part, one side of the corbel frame (2) is connected to the corbel seat (1), the beam frame (3) is installed on the upper part of the corbel frame (2), a plurality of suspension ropes (6) are connected to the beam frame (3), one end of the suspension rope (6) away from the beam frame (3) extends to the ground, the prestressing frame (4) is connected to one end of the suspension rope (6) away from the beam frame (3), a buoyancy member (5) is installed at the bottom of the prestressing frame (4), and a gap is left between the buoyancy member (5) and the pedestal; The construction method of the above-mentioned cast-in-place bracket of the 0# block of the concrete beam of the cable-stayed bridge comprises the following steps: Each of the corbel seats (1) is mounted on the embedded parts on the main tower (7), and then the corbel frame (2) is mounted on the corresponding corbel seat (1), and then the beam frame (3) is mounted on the corbel frame (2), and the suspension rope (6) is tied on the beam frame (3) according to the designed position; A water pool (8) is built on the supporting platform, the water pool (8) surrounds the main tower (7), a drain port is provided at the bottom of the water pool (8), a drain valve (83) is installed in the drain port, and then water is injected into the water pool (8); The prestressing material is piled on the prestressing frame (4) to a designed load, and then the prestressing frame (4) is hoisted into the water pool (8) by a crane, and the prestressing frame (4) floats above the water surface of the water pool (8). Then, the prestressing frame (4) is moved to a set position, and the prestressing frame (4) is connected to the corresponding hoisting rope (6); Open the drain valve (83), drain the water from the pool (8), start loading and pre-pressing until the water level in the pool (8) is lower than the lower part of the buoyancy member (5), and then close the drain valve (83); After the pre-pressing time reaches a preset time, water is poured into the water pool (8) to start unloading until the water level in the water pool (8) rises to a set height, and the connection between the pre-pressing frame (4) and the suspension rope (6) is released; The pre-stressing frame (4) is lifted out of the water pool (8) by a crane, the drain valve (83) is opened, the water in the water pool (8) is drained, and finally the water pool (8) is dismantled.

2. The construction method of the cast-in-place bracket of the 0# block of the concrete beam of a cable-stayed bridge according to claim 1, It is characterized in that The construction method of the water pool (8) is as follows: a partition (81) is used to build a pool wall around the main tower (7) on a supporting platform, and then a waterproof cloth (82) is laid between the pool wall and the main tower (7), wherein the waterproof cloth (82) surrounds the main tower (7) at least once, one end of the waterproof cloth (82) is fixedly connected to the upper end of the partition (81), and the other end of the waterproof cloth (82) is fixedly connected to the main tower (7), and the drain valve (83) is installed on the waterproof cloth (82), and the drain valve (83) passes through the partition (81).

3. The construction method of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge according to claim 2, characterized in that: Reinforcing frames (85) are respectively installed at both ends of the pool wall, a number of columns (86) are installed between the two reinforcing frames (85), a reinforcing ring (87) is installed near the bearing platform of the main tower (7), and a reinforcing rod (88) is installed between the lower reinforcing frame (85) and the reinforcing ring (87).

4. The construction method of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge according to claim 3, characterized in that: A plurality of diagonal bracing rods (84) distributed around the pool wall are installed on the outer side of the pool wall. One end of the diagonal bracing rod (84) is connected to the upper reinforcing frame (85), and the other end of the diagonal bracing rod (84) abuts against the bearing platform.

5. The construction method of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge according to claim 2, characterized in that: One end of the waterproof cloth (82) connected to the main tower (7) is higher than one end of the waterproof cloth (82) connected to the partition board (81). The waterproof cloth (82) is pasted on the main tower (7) through adhesive to form a seal.

6. The construction method of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge according to claim 1, characterized in that: The bottom and the periphery of the preloading frame (4) are closed by sealing plates.

7. The construction method of the cast-in-place support for the 0# block of the concrete beam of the cable-stayed bridge according to claim 1, characterized in that: A pressure bar (9) is installed above the beam frame (3). The pressure bar (9) straddles above the lower cross beam of the main tower (7). A pressure block (10) is connected in the middle of the pressure bar (9). The pressure block (10) is connected to the beam frame (3). Both ends of the pressure bar (9) are located outside the horizontal projection of the main tower (7) and are respectively connected to a suspension rope (6).

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