Underwater butt joint device for water intake and discharge culvert of thermal power plant

Abstract

This utility model discloses an underwater docking device for intake and drainage box culverts in thermal power plants. It includes a precast box culvert with water-stopping mechanisms evenly distributed around its ends, and symmetrically embedded tie rod brackets on both sides. The top of the precast box culvert has lifting points, and the bottom has embedded steel plates. A tie-fitting seat is installed on the top of the precast box culvert. The tie rod brackets are bolted to reinforcing tie rod bolts to secure adjacent precast box culverts. Adjacent precast box culverts are connected to the tie-fitting seat via jacks and tie rods. The jacks and tie rods, in conjunction with the jacks, adjust the spacing between adjacent precast box culverts. This utility model, by setting a tie-fitting seat and tie rod brackets on the top of the precast box culvert, and using designed jacks and jacks and tie rods to dock two precast box culvert sections, ensures that the two sections are precisely aligned to the latest design spacing, guaranteeing that the sealing of the precast box culvert interface meets design requirements, thereby ensuring the water quality of the circulating water system.

Description

Technical Field

[0001] This utility model relates to the field of water intake and drainage technology for circulating water systems in thermal power plants, and in particular to an underwater docking device for water intake and drainage culverts in thermal power plants. Background Technology

[0002] Currently, the intake and drainage sections of circulating water systems in thermal power plants mainly employ open channels or box culverts. However, the intake and drainage systems of coastal power plants are constrained by environmental protection and seawall restrictions. When the natural conditions of the intake and drainage sea area are limited, it is often impossible to adopt the method of large-scale open channel excavation. Instead, box culverts are required for water intake and drainage. Because of the surrounding seawater environment, if a cast-in-place concrete box culvert structure is used, it is necessary to set up construction cofferdams or foundation pit water-stopping support and other water-blocking facilities to meet the requirements of the waterless pouring construction environment for cast-in-place reinforced concrete. The cofferdams or foundation pit water-stopping support measures adopted to achieve dry foundation pit cast-in-place concrete box culverts are very expensive. To reduce project investment, the main method currently adopted is to excavate the box culvert foundation trench underwater, prefabricate the box culverts on land, and then use ships to tow them to the predetermined location for underwater installation. The prefabricated box culverts are then installed in place with the assistance of cranes and on-site construction personnel.

[0003] Currently, the underwater docking and placement of precast intake and drainage box culverts typically involves using a crane vessel that meets the lifting weight requirements to submerge the first precast box culvert section underwater to the predetermined position. The crane vessel's attitude is then adjusted to align with the design axis. The crane vessel then continues to horizontally lift the precast box culvert section to be installed to the predetermined position for docking and installation. With the assistance of the crane vessel and construction workers, the two precast box culvert sections are slowly brought closer together and fitted. Measuring devices are used to help determine whether the box culvert is in place. At the same time, construction technicians confirm that the sealing performance of the water-stopping device meets the design requirements, thus completing the docking of the box culverts.

[0004] However, the existing underwater docking of precast box culverts still has the following problems: the underwater docking installation of precast box culverts basically relies on the cooperation of cranes and construction technicians. The determination of whether the precast box culverts are docked properly is based on human experience supplemented by measuring equipment. This installation method has high requirements for the operation of cranes and relies entirely on the experience of construction personnel. There are no corresponding technical protection measures. During the sinking construction process on the water, it is often affected by sea waves, water flow and weather conditions, making it difficult to meet the requirements. This results in insufficient sealing of the box culvert. Mud and sand around the gaps can enter the circulating water system through the gaps, which will affect the service life of the circulating water pumps and condensers. In severe cases, it can lead to damage to the circulating water pumps and condenser water pipes and shutdown. Therefore, an underwater docking device for the intake and drainage box culverts of thermal power plants is proposed. Utility Model Content

[0005] In order to solve the above-mentioned problems existing in the prior art, this utility model provides an underwater docking device for intake and drainage culverts in thermal power plants.

[0006] The technical solution of this utility model is as follows:

[0007] An underwater docking device for intake and drainage box culverts in a thermal power plant includes a precast box culvert. Water-stopping mechanisms are evenly distributed around the ends of the precast box culvert, and tie rod brackets are symmetrically embedded on both sides of the precast box culvert. The top of the precast box culvert has lifting points, and a base steel plate is embedded at the bottom. A tie-fitting seat is installed on the top of the precast box culvert. The tie-fitting seat includes a frame structure welded from a vertical plate, a baffle A, and a horizontal plate. The tie-fitting seat also includes an embedded plate, which is fixed to the top of the precast box culvert and connected to the horizontal plate by fastening bolts. Anchor plates are provided at the ends of the fastening bolts embedded in the top of the precast box culvert. The tie rod brackets are bolted to each other with reinforcing tie rod bolts to secure adjacent precast box culverts. Adjacent precast box culverts are connected to the tie-fitting seat via jack rods, and the spacing between adjacent precast box culverts is adjusted by the combined action of the jack rods and jacks.

[0008] Preferably, the water-stopping mechanism is an annular elastic water-stopping material, which is pre-embedded around the ends of the precast box culvert and is compressed during the pulling process to achieve a seal.

[0009] Preferably, the bottom steel plate is pre-embedded in the bottom of the precast box culvert to ensure that the mating surface of the bottom steel plate of the adjacent box culvert is free of impurities.

[0010] Preferably, the jack also includes a baffle B, a hydraulic cylinder and a piston rod. One end of the hydraulic cylinder is fixedly connected to the baffle B, and the other end is equipped with the piston rod. The piston rod is hydraulically driven to extend and retract, used to pull adjacent precast box culverts to the designed spacing.

[0011] This invention offers the following advantages: By installing a tie-fit seat and tie rod bracket at the top of the precast box culvert, and coordinating with a designed jack and jack rod, two precast box culvert sections are connected. This ensures precise alignment of the two sections to the required design spacing, guaranteeing the sealing of the precast box culvert interface meets design requirements and thus ensuring the water quality of the circulating water system. Simultaneously, the use of a water-stop structure for sealing provides high reliability for this precast box culvert installation method, making it suitable for most underwater environments. This overcomes the shortcomings of previous precast box culvert installation methods that relied solely on technicians' experience and measuring tools to determine installation accuracy, significantly improving installation precision. Attached Figure Description

[0012] Figure 1 This is a top view of the prefabricated box culvert of this utility model;

[0013] Figure 2 The precast box culvert of this utility model Figure 1 Schematic diagram of the interrupted surface AA;

[0014] Figure 3 This is a top view of the pull-open seat of this utility model;

[0015] Figure 4 This is a schematic diagram of the overall structure and installation of the pull-open seat of this utility model;

[0016] Figure 5 This is a schematic diagram of the precast box culvert assembly and disassembly process of this utility model;

[0017] Figure 6 This is a schematic diagram of the installation process between two prefabricated box culverts according to this utility model;

[0018] Figure 7 This is a schematic diagram of the jack of this utility model;

[0019] Figure 8 This utility model Figure 2 A schematic diagram of the cross-section of the water-stopping structure before compression;

[0020] Figure 9 This utility model Figure 2 A schematic diagram of the cross-section of the water-stopping structure after compression.

[0021] The reference numerals in the figure are as follows:

[0022] 1. Connecting seat; 101. Vertical plate; 102. Baffle A; 103. Horizontal plate; 104. Embedded plate; 105. Fastening bolt; 106. Anchor plate; 2. Tie rod bracket; 3. Lifting point; 4. Water-stop structure; 5. Jack; 501. Baffle B; 502. Hydraulic cylinder; 503. Piston rod; 6. Jack tie rod; 7. Reinforcing tie rod bolt; 8. Bottom steel plate; 9. Precast box culvert. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] See Figures 1 to 9An underwater docking device for intake and drainage box culverts in a thermal power plant includes a precast box culvert 9. Water-stopping mechanisms 4 are evenly distributed around the ends of the precast box culvert 9, and tie rod brackets 2 are symmetrically embedded on both sides of the precast box culvert 9. The top of the precast box culvert 9 has lifting points, and the bottom has embedded base steel plates 8. A connecting seat 1 is installed on the top of the precast box culvert 9. The connecting seat 1 includes a frame structure welded from a vertical plate 101, a baffle A102, and a horizontal plate 103. The connecting seat 1 also includes an embedded plate 1. 04. The embedded plate 104 is fixed to the top of the precast box culvert 9 and connected to the horizontal plate 103 by fastening bolts 105; the fastening bolts 105 are embedded at the ends of the top of the precast box culvert 9 and anchor plates 106 are provided; the tie rod bracket 2 and the reinforcing tie rod bolt 7 are bolted to each other to fasten the adjacent precast box culvert 9; the adjacent precast box culvert 9 are connected to the tie seat 1 by jack tie rod 6, and the jack tie rod 6 and the jack 5 work together to adjust the spacing of the adjacent precast box culvert 9.

[0025] Furthermore, the water-stopping mechanism 4 is a ring-shaped elastic water-stopping material, which is pre-embedded around the ends of the precast box culvert 9 and is compressed during the pulling process to achieve a seal.

[0026] Furthermore, the bottom steel plate 8 is pre-embedded in the bottom of the precast box culvert 9 to ensure that the mating surface of the bottom steel plate 8 of the adjacent box culvert is free of impurities.

[0027] Furthermore, the jack 5 also includes a baffle B501, a hydraulic cylinder 502 and a piston rod 503. One end of the hydraulic cylinder 502 is fixedly connected to the baffle B501, and the other end is equipped with the piston rod 503. The piston rod 503 is hydraulically driven to extend and retract, and is used to pull the adjacent precast box culverts 9 to the designed spacing.

[0028] The following methods are used for docking, including the following steps:

[0029] Step 1: When the precast box culvert 9 is precast on land, the following components are pre-embedded: pull-down seat 1, water-stop mechanism 4, tie rod bracket 2, lifting point 3, and bottom steel plate 8.

[0030] Step 2: Lift the precast box culvert 9 using a lifting vessel, adjust the vessel's attitude to align it with the design axis, and lower it until the distance between it and the installed box culvert is no greater than the design value;

[0031] Step 3: Adjust the box culvert's posture using winches on both sides. After confirming that there are no debris on the contact surface of the bottom steel plate 8, install the jack 5 and connect the jack rod 6.

[0032] Step 4: Simultaneously operate the jacks 5 on both sides to pull the box culvert to be installed and the installed box culvert to the designed distance, ensuring the water-stopping mechanism 4 is compressed and sealed; by monitoring the pulling force of the jacks 5 and the distance between the box culverts, judge the docking accuracy and the status of foreign object removal, and ensure that there is no axial deviation during the pulling process.

[0033] Step 5: Connect and tighten the reinforcing tie rod 7 to ensure that the water-stopping mechanism 4 meets the sealing requirements;

[0034] Step Six: Slowly release the hook and remove the outfitting components to complete the underwater docking.

[0035] The working principle of this utility model:

[0036] In this utility model, when the precast box culvert 9 is prefabricated and ready for hoisting, a hoisting vessel capable of lifting the precast box culvert is used for hoisting. First, the vessel's posture is adjusted so that its centerline is aligned with the design axis. The vessel then lifts the precast box culvert 9 using lifting points 3, ensuring the net distance between it and the already installed box culvert is no greater than the design value, aided by measurement. When the distance between the box culvert to be installed and the already installed box culvert meets the design requirements, the posture of the box culvert is readjusted using winches arranged on both sides to ensure the centerline basically meets the requirements. The box culvert is then lowered to the bottom, at which point the bottom south side of the box culvert to be installed is in contact with the bottom steel plate 8 of the previous box culvert. It is necessary to confirm again that there are no debris between the bottoms of the two box culverts. Simultaneously, the designed jack 5, including baffle B501, cylinder 502, and piston rod 503, is installed on the pulling seat 1, and the jack pull rod 6 is connected. Then, the box culvert to be installed is pulled towards the side that has been installed. By combining the fact that the final gap between the two box culvert sections is not greater than the design value, and the theoretical value of the resultant force of the jack 5 is not greater than the design value, we can judge the position of the precast box culvert and whether there are any foreign objects that have not been cleaned between the box culverts. During the pulling process, we should also pay attention to the coordination of the left and right jacks 5 to ensure that the box culvert axis does not deviate and that the jack 5 meets the requirements of the maximum design safe load.

[0037] After the precast box culvert 9 is installed to the designed spacing, the reinforcing tie rods 7 are bolted and tightened to ensure that the water-stopping mechanism 4 is compressed to the design requirements, achieving the final water-stopping and sealing effect. Finally, the hook is slowly released to ensure that the box culvert's posture does not change before the hook is completely released, the box culvert surface outfitting components are removed, and the underwater docking of the precast box culvert is completed.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An underwater docking device for intake and drainage box culverts in a thermal power plant, comprising a prefabricated box culvert (9), characterized in that: Water-stopping mechanisms (4) are evenly distributed around the ends of the precast box culvert (9), and tie rod brackets (2) are symmetrically embedded on both sides of the precast box culvert (9); the top of the precast box culvert (9) is provided with a lifting point, and a bottom pad steel plate (8) is embedded at the bottom; a tie-locking seat (1) is installed on the top of the precast box culvert (9); the tie-locking seat (1) includes a frame structure welded from a vertical plate (101), a baffle A (102), and a horizontal plate (103); the tie-locking seat (1) also includes an embedded plate (104), which is fixed to the precast box culvert. The top of the box culvert (9) is connected to the cross plate (103) by fastening bolts (105); the fastening bolts (105) are embedded at the ends of the top of the precast box culvert (9) and are provided with anchor plates (106); the tie rod bracket (2) and the reinforcing tie rod bolt (7) are bolted to each other to fasten the adjacent precast box culverts (9); the adjacent precast box culverts (9) are connected to the tie seat (1) by jack tie rod (6), and the jack tie rod (6) and the jack (5) work together to adjust the spacing between the adjacent precast box culverts (9).

2. The underwater docking device for intake and drainage culverts in a thermal power plant according to claim 1, characterized in that: The water-stopping mechanism (4) is an annular elastic water-stopping material, which is embedded around the end of the precast box culvert (9) and compressed during the pulling process to achieve a seal.

3. The underwater docking device for intake and drainage culverts in a thermal power plant according to claim 1, characterized in that: The bottom steel plate (8) is embedded in the bottom of the precast box culvert (9) to make contact with the bottom steel plate (8) of the adjacent box culvert without impurities.

4. The underwater docking device for intake and drainage culverts in a thermal power plant according to claim 1, characterized in that: The jack (5) also includes a baffle B (501), a cylinder (502) and a piston rod (503). One end of the cylinder (502) is fixedly connected to the baffle B (501), and the other end is equipped with the piston rod (503). The piston rod (503) is hydraulically driven to extend and retract, and is used to pull adjacent precast box culverts (9) to the designed spacing.

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