An underwater pier cap compartmentalized construction structure and a construction method thereof

Abstract

The present application belongs to a kind of underwater pier cap compartment type construction structure and its construction method, underwater pier cap compartment type construction structure is isolated warehouse, butt joint cylinder and float box, the present application method is to use isolated warehouse, butt joint cylinder and float box to form dry land environment in isolated warehouse in underwater pier cap design position, and the present application is superior to cofferdam method not to be less than 20 limit of water depth, the present application construction cycle is short, and drainage capacity is less, and there is no influence to environment, and technical risk is low and space occupation is small, the present application is convenient for underwater foundation pit excavation, steel banding, concrete pouring and other construction operations, construction quality is easy to control, also adapts to complex geology, and structural stability is high.

Description

Technical Field

[0001] This invention relates to a compartmentalized construction structure for underwater bridge pier foundations and its construction method. Background Technology

[0002] The methods currently used for constructing bridge piers or main bridge pier foundations in rivers and seabeds include cofferdam method, caisson method, bored pile method, precast pile method, and floating installation method.

[0003] The cofferdam method is generally suitable for areas with water depths less than 20m and gentle water flow. It involves driving steel sheet piles into the bridge piers to form a steel sheet pile cofferdam. After the water inside the cofferdam is pumped out, concrete is poured in the dry environment inside the cofferdam. Its advantages are that it facilitates construction operations such as foundation pit excavation, rebar tying, and concrete pouring, construction quality is easy to control, it is adaptable to complex geology, has high structural stability, and low construction cost. Its disadvantages are that the construction period is long, it is limited by water depths of less than 20m, it causes great environmental damage, has high technical risks, and occupies a lot of space.

[0004] The caisson method, similar to the cofferdam method, is generally suitable for areas with water depths greater than 10m. Typically, reinforced concrete caissons with openings at the top and bottom are prefabricated on shore or on barges, floated to the design location, and sunk to the seabed bearing layer by loading or sludge suction. After cleaning the foundation, underwater concrete is poured to seal the bottom, and then the water inside is pumped out to complete the main pier construction. Its advantages are that it is suitable for deep-water environments, has strong bearing capacity, good stability, reduces underwater operations, and has low construction costs. Its disadvantages are that the construction period is long, the difficulty is high, the equipment requirements are high, the environmental damage is significant, the risks are high, and the cost fluctuates greatly.

[0005] The bored pile method involves using steel pipe piles or floating boxes to build a temporary platform, and using a rotary drilling rig or impact drilling rig to drill through the seabed soil or rock strata to form a hole. A steel cage is then placed inside the hole, and concrete is poured underwater into the hole. Its advantages are strong adaptability, high bearing capacity, low vibration, and no need for cofferdams. Its disadvantages are long construction period, high difficulty, high technical requirements, significant environmental damage, strong geological dependence, high risk, and high cost.

[0006] The precast pile driving method involves prefabricating pile sections in a factory, transporting them to the construction site, and then sinking them into the seabed by hammering or using a pile driving vessel. The tops of the piles are connected to the pier caps to form the pier foundation. Its advantages are strong adaptability, minimal environmental impact, high bearing capacity, low vibration, fast construction speed, and controllable quality. Its disadvantages are high noise and vibration, high difficulty, large displacement of the soil-displacement pile position, large geological restrictions, high requirements for transportation to the construction site, non-adjustable pile length, and high cost.

[0007] The floating installation method involves prefabricating integral bridge piers or segmented components on shore, transporting them to the construction site using large floating cranes or semi-submersible vessels, accurately positioning them, and then sinking them for installation. The components are then fixed by underwater grouting or bolts. Its advantages include suitability for large-span heavy structures, minimal environmental impact, good economic benefits, and high construction efficiency. Its disadvantages include limitations imposed by natural conditions, complex preliminary preparations, large displacement of soil displacement piles, numerous geological restrictions, and many uncontrollable cost factors.

[0008] Obviously, considering all factors, the ideal construction method for building bridge piers in rivers or seabeds would be to pour concrete in a dry environment at the designed location on the seabed. This would facilitate construction operations such as excavation, reinforcement binding, and concrete pouring, make construction quality easier to control, adapt to complex geological conditions, and ensure high structural stability. However, this construction method is currently unavailable. Summary of the Invention

[0009] The purpose of this invention is to provide an underwater bridge pier foundation compartmentalized construction structure and its construction method, so as to achieve the ideal construction method for building bridge piers in rivers and seabeds as proposed in the background art.

[0010] Therefore, the present invention provides a compartmentalized construction structure for underwater bridge pier caps, including a gantry crane, and further comprising: An isolation chamber is used to create a dry environment that partially isolates the surrounding water at the designed location of an underwater bridge pier foundation. The cross-sectional shape of the isolation chamber is the same as the designed cross-sectional shape of the bridge pier foundation, but the perimeter of the isolation chamber is greater than the designed perimeter of the bridge pier foundation. The isolation chamber is a steel chamber body that is sealed with steel plates at the top and around the perimeter and open at the bottom. The outer shell of the steel chamber body is equipped with a steel frame composed of horizontal and vertical steel frames intersecting at right angles. The upper middle part of the steel chamber body is equipped with an isolation chamber inlet / outlet cylinder that communicates with the upper interior of the isolation chamber. The upper end of the isolation chamber inlet / outlet cylinder is equipped with a docking flange. The four corners of the outer side of the isolation chamber are equipped with pressure rods and lifting lugs. The upper end of the pressure rod is higher than the top of the isolation chamber and is equipped with a pressure plate. The lower end of the isolation chamber is equipped with an annular pointed foot. The inner lower perimeter wall of the steel chamber body is equipped with a sealing ring seat, and the outer side of the sealing ring seat is equipped with an inflatable sealing ring. The connecting cylinder is used to isolate the water layer around the inlet / outlet cylinder of the isolation chamber and the pontoon. The connecting cylinder is made of steel plate pressed into a cylindrical shape. Both ends of the steel cylinder are equipped with connecting flanges. Several connecting cylinders are connected in series. A rubber waterproof ring is provided between each connecting flange. Each connecting flange is connected to a fastening nut by fastening bolts passing through the bolt holes on the connecting flange and the rubber waterproof ring. During the construction of the isolation chamber, the upper end of the connected connecting cylinder is located on the upper water surface in the sinkhole of the isolation chamber. The pontoon is used to carry, lower, and support construction operations inside the isolation chamber. During isolation chamber construction, the pontoon is located on the water surface above the isolation chamber. The pontoon is a hollow hull with an isolation chamber sinking hole in the middle. The isolation chamber rises and falls in the sinking hole. The pontoon decks on both sides of the sinking hole are equipped with rails for gantry cranes to run on. At least two gantry cranes are installed on the rails. The four corner decks of the sinking hole of the isolation chamber are equipped with pressing devices corresponding to the pressure rods of the isolation chamber. Anchor boxes are installed at the four corners of the pontoon. The pontoon decks on both sides of the sinking hole of the isolation chamber between the two rails are divided into a unloading area and a storage area. The pontoon decks are also equipped with power generation equipment, air supply equipment, water pumping and sludge suction equipment, mixing equipment, and control room.

[0011] As a further description of the above technical solution: the pier foundation is located inside the isolation chamber, and the distance between the side of the pier foundation and the corresponding part of the isolation chamber is 50cm to 100cm.

[0012] As a further description of the above technical solution: the inner side of the sealing ring seat is sealed to the lower end of the corresponding steel chamber body, the outer side of the sealing ring seat is a concave arc surface, the inner side of the inflatable sealing ring is sealed to the concave arc surface of the sealing ring seat, and the outer side of the inflatable sealing ring after inflation is supported on the side of the completed bridge pier foundation, and a sealing oil layer is provided on the side of the bridge pier foundation.

[0013] As a further description of the above technical solution: the two end planes of the docking cylinder protrude from the outer plane of the docking flange of the corresponding part.

[0014] As a further description of the above technical solution: a number of reinforcing angle steel plates are provided between the lower outer periphery of the isolation chamber inlet and outlet cylinder and the upper end of the corresponding steel chamber body.

[0015] As a further description of the above technical solution: the height of the inner wall of the isolation chamber is equal to the sum of the soil penetration depth at the lower end of the isolation chamber and the construction height of more than 10m inside the isolation chamber.

[0016] A construction method for an underwater bridge pier cap compartmentalized construction structure includes the following specific steps: (1) Prepare underwater bridge pier compartmentalized construction structure, including pontoons, several docking cylinders, and isolation compartments, and equip them with construction equipment and materials; (2) The underwater pier compartmentalized construction structure is towed by tugboat to the upper end of the designed pier pile foundation, or the upper end of the designed and completed pier pile foundation, and the pontoon is anchored and fixed. (3) Start the crane to slowly and vertically lower the isolation chamber into the water in the isolation chamber sink hole. When the upper port of the isolation chamber inlet and outlet cylinder is at the upper end of the water surface in the isolation chamber sink hole, stop the descent of the isolation chamber and build a construction gangway platform on the deck around the outer perimeter of the upper port of the isolation chamber inlet and outlet cylinder and the perimeter of the isolation chamber sink hole. (4) A connecting tube is sealed and connected in series at the upper port of the inlet and outlet of the isolation chamber. A rubber waterproof ring is provided between the two connecting flanges. The lower port of the connecting tube passes through the connecting flange, the fastening bolt passes through the bolt holes on the two connecting flanges and the bolt holes on the rubber waterproof ring, and is then screwed and sealed with the fastening nut to form a whole, so that the connecting tube is sealed and connected in series with the upper port of the inlet and outlet of the isolation chamber. (5) Slowly lower the isolation chamber until the upper end of the connected docking cylinder is located above the water surface in the sinkhole of the isolation chamber, and then connect another docking cylinder in series on the top of the upper docking cylinder according to the connection method in step (4). (6) Repeat step (5) until the lower end of the isolation chamber is driven into the mud around the pier pile foundation. Use the pressing device located on the four corner decks of the isolation chamber sink hole to press down the pressure plate located on the pressure rod at the four corners of the isolation chamber, so that the lower end of the isolation chamber sinks horizontally and evenly to the predetermined depth, and the upper end of the connected docking cylinder is located on the upper water surface in the sink hole of the isolation chamber. (7) Start the pumping and sludge suction equipment to drain the water in the isolation chamber and the docking cylinder and suck out the mud and water at the bottom of the isolation chamber to ensure that a dry construction environment is formed in the isolation chamber. Fresh air, power supply equipment and lighting are supplied to the underwater hollow isolation chamber through the axial flow fan on the deck. Construction equipment, construction materials and construction personnel are input into the isolation chamber through the docking cylinder and the isolation chamber inlet and outlet cylinder using a crane and bucket. (8) Complete the pile head removal, pile foundation testing, cushion layer construction, reinforcement binding, and erection of the pier cap formwork at the lower end of the isolation chamber, and pour the pier cap concrete. The upper surface of the pier cap concrete poured each time is located at the upper end of the isolation chamber. (9) After the concrete of the pier foundation reaches a certain strength, remove the formwork of the pier foundation, apply a sealing oil layer to each side wall of the pier foundation, and slowly lift the isolation chamber with a crane, wire rope and lifting lugs until the inflatable sealing ring at the lower end of the isolation chamber is parallel or in contact with the lower end of the side wall of the pier foundation. Inflate and pressurize the inflatable sealing ring so that the inflatable sealing ring seals the gap between the lower end of the isolation chamber and the side wall of the pier foundation. Slowly lift the isolation chamber to the upper part of the completed side wall of the pier foundation and remove the connecting cylinder that is higher than the water surface in the sinkhole of the isolation chamber. (10) Continue to extend the pier foundation on the completed pier foundation in the isolation chamber, including steel bar binding, erecting pier foundation formwork, and pouring pier foundation concrete. The upper end of each pier foundation concrete pour is located at the upper end of the isolation chamber. (11) Repeat steps (9) and (10) until the upper surface of the completed pier foundation is higher than the water level in the sinkhole of the isolation chamber. Remove the construction equipment and materials from the isolation chamber and tow the underwater pier compartment construction structure to the upper part of the next designed pier pile foundation by tugboat for construction.

[0017] As a further description of the above technical solution: the sealing oil layer is grease.

[0018] As a further description of the above technical solution: the pressing device is a rotary drilling rig or an impact drilling rig.

[0019] As a further description of the above technical solution: the lower inner end of the steel silo body is provided with 1 to 3 sealing ring seats and an inflatable sealing ring structure.

[0020] The present invention has the following beneficial effects: 1. This invention utilizes an isolation chamber, a docking cylinder, and a pontoon to create a dry environment within the isolation chamber at the designed location of the underwater bridge pier foundation. Concrete pouring for the bridge pier foundation is then carried out within this dry environment. This invention is superior to the cofferdam method as it is not limited by water depths less than 20 meters. This invention can be constructed underwater within a range of 3m to 100m. It has a short construction period, requires less drainage, has no environmental impact, low technical risk, and minimal space occupation. This invention facilitates underwater foundation excavation, rebar tying, concrete pouring, and other construction operations. Construction quality is easy to control, it is adaptable to complex geological conditions, and exhibits high structural stability.

[0021] 2. The present invention has low construction cost, eliminating the need for on-site construction of cofferdams by driving sheet piles one by one underwater. The isolation chamber, connecting cylinder, and pontoon of the present invention are reusable, resulting in low equipment wear and tear. The present invention connects the isolation chamber and the pontoon working platform by connecting the connecting cylinder in series, occupying little underwater space, which greatly reduces construction costs and cofferdam construction expenses, resulting in good economic benefits.

[0022] 3. This invention is convenient to construct, has simple procedures, and is easy to master. It has good application effects and has the advantages of saving labor and effort during construction, being simple to construct, fast, saving materials, being highly efficient, and being highly practical. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure during construction of the present invention; Figure 3 for Figure 2 A schematic diagram of the B-B cross-sectional structure in the diagram; Figure 4 for Figure 3 A schematic diagram of the C-C cross-sectional structure in the image; Figure 5 for Figure 1 A schematic diagram of the A-A cross-sectional structure in the diagram; Figure 6 This is a schematic diagram of the docking part of the docking cylinder of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. To facilitate understanding of the technical means, creative features, and achieved objectives and effects of the present invention, the present invention will be further elaborated below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of the present invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments without creative effort are all within the protection scope of the present invention. Unless otherwise specified, the construction methods in the following embodiments are conventional methods. Unless otherwise specified, the materials, devices, equipment, etc., used in the following embodiments can be obtained commercially.

[0025] Example 1: As Figures 1 to 6 As shown, an underwater bridge pier cap compartmentalized construction structure includes a gantry crane 6, and also includes: Isolation chamber 1 is used to create a dry environment at the designed location of the underwater pier cap 12, partially isolating it from the surrounding water. The cross-sectional shape of isolation chamber 1 is the same as the designed cross-sectional shape of the pier cap, but the perimeter of the isolation chamber is greater than the designed perimeter of the pier cap. During construction, the pier cap 12 is located inside isolation chamber 1, with a distance of 50cm to 100cm between the side of the pier cap 12 and the corresponding part of the isolation chamber, to facilitate sealing the gap between the lower end of the isolation chamber and the side wall of the pier cap using an inflatable sealing ring 104. The isolation chamber is a steel chamber body 106 with a top and perimeter sealed with steel plates and an open bottom. The steel chamber body is welded from a pressure-resistant steel plate at least 1cm thick. The outer shell of the steel chamber body 106 is equipped with a steel frame composed of horizontal steel frames 108 and vertical steel frames 105 welded at right angles to ensure that the isolation chamber has sufficient strength and pressure resistance. The horizontal and vertical steel frames are made of angle steel or I-beams at least 1cm thick. The upper middle part of the steel silo body is provided with an isolation silo inlet / outlet cylinder 101 that communicates with the upper part of the isolation silo. Several reinforcing angle steel plates 18 are spaced apart between the lower outer periphery of the isolation silo inlet / outlet cylinder 101 and the corresponding upper part of the steel silo body to strengthen the connection between the isolation silo inlet / outlet cylinder and the corresponding upper part of the steel silo body. A docking flange 901 is provided at the upper end of the isolation silo inlet / outlet cylinder, with several through bolt holes 107 spaced apart for docking with the docking cylinder. Pressure-bearing rods 111 and lifting lugs 102 are provided at the four corners of the outer side of the isolation silo. The upper end of the pressure-bearing rods 111 is higher than the top of the isolation silo (3-20m) and a pressure plate 103 is provided on it. An annular pointed foot 109 is provided at the lower end of the isolation silo body for easy insertion into the mud layer 13. A sealing ring seat 110 is provided on the lower inner periphery of the steel silo body, and an inflatable sealing ring 104 is provided on the outer side of the sealing ring seat. The height of the inner wall of the isolation chamber is equal to the sum of the depth of the lower end of the isolation chamber into the soil and the construction height of more than 10m inside the isolation chamber. If the depth of the lower end of the isolation chamber into the soil is 6m (deep into the impermeable layer of mud), then the height of the inner wall of the isolation chamber shall not be less than 16m.

[0026] The inner surface of the sealing ring seat 110 is sealed to the lower end of the corresponding steel silo body. The outer surface of the sealing ring seat is a concave arc surface. The inner surface of the inflatable sealing ring is sealed to the concave arc surface of the sealing ring seat. The inflatable sealing ring is made of rubber. After inflation, the outer surface of the inflatable sealing ring rests against the side of the completed bridge pier foundation. The sealing ring seat and the inflatable sealing ring can move upward synchronously on the side of the bridge pier foundation as the isolation chamber moves upward. A sealing oil layer, which is grease, is provided on the side of the bridge pier foundation. When the sealing ring seat and the inflatable sealing ring move upward synchronously on the side of the bridge pier foundation, the sealing oil layer can play a sealing and lubricating role. The lower end of the inner steel silo body is provided with 1 to 3 sealing ring seats and inflatable sealing ring structures, all of which are located at the lower end of the steel silo body.

[0027] The connecting cylinder 9 is used to isolate the water layer 16 surrounding the inlet / outlet cylinder of the isolation chamber and the pontoon. The connecting cylinder is made of pressure-resistant steel plate pressed into a cylindrical shape. The steel plate is at least 1 cm thick and has a diameter greater than 6 m and a height of not less than 10 m. Both ends of the steel cylinder are equipped with connecting flanges 901. Several through bolt holes 107 are spaced apart on the connecting flanges. Several connecting cylinders are connected in series. A rubber waterproof ring 21 is provided between each connecting flange. The rubber waterproof ring 21 is made of waterproof pressure-bearing rubber and is at least 7 mm thick. Several through bolt holes 107 are spaced apart on the rubber waterproof ring. The two ends of the connecting cylinder protrude 2 mm beyond the outer surface of the corresponding connecting flange. When the connecting cylinders are connected in series, the connecting flanges are sealed together by fastening bolts passing through the bolt holes on the connecting flanges and the rubber waterproof ring, and then screwed with fastening nuts. At this time, the rubber waterproof ring is compressed, causing the two ends of the connecting cylinder to be sealed and held in place. During the construction of the isolation chamber, the upper end of the connecting cylinder is located on the upper water surface of the 201 sinkhole in the isolation chamber.

[0028] Floating box 2 is used to carry, lower, and support construction operations within the isolation chamber 1. During isolation chamber construction, floating box 2 floats on the water surface above the isolation chamber. The floating box has a hollow hull shape, with an isolation chamber sinking hole 201 in the middle. The isolation chamber rises and falls within the sinking hole 201. Rails 202 for gantry cranes 6 are provided on the floating box decks on both sides of the sinking hole. At least two gantry cranes are mounted on the rails, using cranes 601, wire ropes 8, buckets 10, and hooks to lift and transport materials. At the four corners of the sinking hole, corresponding to the pressure rods of the isolation chamber, there are pressing devices 5. These pressing devices are rotary drilling rigs or impact drilling rigs. The pressing drill rods 501 of the rotary drilling rig or impact drilling rig can support the pressure plate 103 of the pressure rod, thus pressing the isolation chamber to the designed depth. Anchor boxes 204 are provided at the four corners of the floating box for anchoring and securing it. The floating decks on both sides of the sinkhole of the isolation chamber between the two tracks are divided into an unloading area 203 and a storage area 205. The unloading area is used to store the mud dredged from the bottom of the isolation chamber, which will be transported away by ship later. The storage area 205 is used to store the building materials used for casting the bridge pier foundation. A mixing and suction device 206 can be installed in the storage area to support the casting of the bridge pier foundation. The floating deck is also equipped with a power generation device 7, an air supply device 4, a water pumping and sludge suction device 23, a mixing device, an axial flow fan 19, and a control room 3. The power generation device 7 provides electrical energy for the equipment, instruments, and lighting on the structure of this invention; the air supply device 4 provides an air source for the pneumatic equipment and inflatable sealing rings on the construction structure of this invention; the water pumping and sludge suction device 23 is a water pump and a sludge suction machine used to pump and suction the sludge in the isolation chamber; the axial flow fan supplies fresh air to the isolation chamber through air ducts; the control room is equipped with instruments for controlling the various equipment on the construction structure of this invention, as well as displays such as a level, depth gauge, and pressure display. It is a traditional structure and will not be described in detail.

[0029] A construction method for an underwater bridge pier cap compartmentalized construction structure includes the following specific steps: (1) Prepare the underwater pier compartmentalized construction structure, including pontoons, several docking cylinders 9, and isolation chambers 1, and equip them with construction equipment and materials. During transportation, the isolation chambers of the underwater pier compartmentalized construction structure are suspended above the water surface of the isolation chamber sinkhole 201 by a crane and steel wire rope 8.

[0030] (2) The underwater pier compartmentalized construction structure is towed by tugboat to the upper end of the designed pier pile foundation 14, or the upper end of the designed and completed pier pile foundation, and the pontoon is anchored to the water surface above the pier pile foundation 14. (3) Start the power generation equipment 7 to supply power, start the crane to slowly and vertically lower the isolation chamber into the water in the isolation chamber sink hole, and stop the descent of the isolation chamber when the upper end of the isolation chamber inlet / outlet cylinder 101 is at the upper end of the water surface in the isolation chamber sink hole. Construct a construction scaffolding platform on the outer periphery of the upper end of the isolation chamber inlet / outlet cylinder and the deck around the isolation chamber sink hole for construction personnel to operate around the isolation chamber inlet / outlet cylinder or docking cylinder.

[0031] (4) A connecting tube 9 is sealed and connected in series at the upper port of the inlet and outlet of the isolation chamber. A rubber waterproof ring 21 is provided between the two connecting flanges 901. The lower port of the connecting tube is connected to the gasket 20 and the fastening bolt 11 through the bolt holes 107 on the two connecting flanges and the bolt holes on the rubber waterproof ring, and then screwed together to form a sealed connection between the connecting tube and the upper port of the inlet and outlet of the isolation chamber. At this time, the steel plates at the lower port of the connecting tube and the upper port of the inlet and outlet of the isolation chamber support each other for bearing force.

[0032] (5) Slowly lower the isolation chamber until the upper end of the connecting tube is located above the water surface in the sinkhole of the isolation chamber, and then connect another connecting tube 9 in series on the top of the upper connecting tube according to the connection method in step (4).

[0033] (6) Repeat step (5) until the lower end of the isolation chamber is driven into the impermeable cement layer 13 around the pier pile foundation 14. The pier pile foundation consists of several support piles, the lower part of which is located in the bearing layer 15. The pressure plate 103 located on the pressure plate at the four corners of the isolation chamber sink hole is pressed down by the pressure rod of the pressure plate at the four corners of the isolation chamber, so that the lower end of the isolation chamber sinks horizontally and evenly to the predetermined depth. Horizontal sensors and depth gauges can be installed at the four corners of the isolation chamber to reflect the horizontal condition and depth of the lower end of the isolation chamber. The upper end of the connected docking cylinder is located on the upper water surface in the sink hole of the isolation chamber.

[0034] (7) Start the pumping and sludge suction equipment to drain the water in the isolation chamber and the docking cylinder and suck out the mud and water at the bottom of the isolation chamber to ensure that a dry construction environment space 17 is formed in the isolation chamber. Fresh air, power supply equipment and lighting are supplied to the underwater hollow isolation chamber through the axial flow fan and air duct on the deck. Construction equipment, construction materials and construction personnel are input into the isolation chamber through the docking cylinder and the isolation chamber inlet and outlet cylinder by crane or bucket.

[0035] (8) Complete the removal of pile heads, pile foundation testing, cushion layer construction, reinforcement binding, and erection of pier cap formwork at the lower end of the isolation chamber. Pour pier cap concrete. The upper surface of the pier cap concrete poured each time is located at the upper end of the isolation chamber. The height of the pier cap concrete poured each time is 8 to 10 meters.

[0036] (9) After the concrete of the pier cap reaches a certain strength, remove the formwork of the pier cap. Apply a sealing oil layer to each side wall of the pier cap. The sealing oil layer is a 1-2cm thick layer of grease. Slowly lift the isolation chamber using a crane, wire rope, and lifting lugs until the inflatable sealing ring at the lower end of the isolation chamber is parallel to or in contact with the lower end of the side wall of the pier cap. Use a pneumatic compressor and inflation pipe to inflate and pressurize the inflatable sealing ring so that the inflatable sealing ring seals the gap between the lower end of the isolation chamber and the side wall of the pier cap. Slowly lift the isolation chamber to the completed... On the upper part of the pier foundation sidewall, due to the gap between the lower end of the inflatable sealing ring sealing the isolation chamber and the pier foundation sidewall after pressurization, the sealing ring seat and the inflatable sealing ring can move synchronously upwards on the side of the pier foundation as the isolation chamber moves upwards. A sealing oil layer is provided on the side of the pier foundation. When the sealing ring seat and the inflatable sealing ring move synchronously upwards on the side of the pier foundation, the sealing oil layer can play a sealing and lubricating role, preventing water from entering the raised isolation chamber. During subsequent pier foundation construction, the inflatable sealing ring remains in a pressurized and expanded state. The connecting cylinder, which was above the water level in the isolation chamber's sinkhole, is then removed.

[0037] (10) Continue to extend the pier foundation on the completed pier foundation in the isolation chamber, including steel bar binding, erecting pier foundation formwork, and pouring pier foundation concrete. The upper end of each pier foundation concrete pour is located at the upper end of the isolation chamber.

[0038] (11) Repeat steps (9) and (10) until the upper surface of the completed pier foundation is higher than the water level in the sinkhole of the isolation chamber. Remove the construction equipment and materials from the isolation chamber, raise the anchor, and use a tugboat to tow the underwater pier compartment construction structure to the upper part of the next designed pier pile foundation for construction.

[0039] Example 2 differs from Example 1 in that: if, after step (7) of the above process (7) involves starting the pumping and sludge removal equipment to drain the water from the isolation chamber and the connecting cylinder, and removing the muddy water from the bottom of the isolation chamber, water still seeps into the bottom of the isolation chamber, quick-setting cement grout can be injected into the mud layer at the bottom of the isolation chamber to seal the bottom of the isolation chamber. This is a traditional method to ensure that a dry construction environment space 17 is formed inside the isolation chamber.

[0040] The rest is the same as in Example 1, so it will not be repeated here.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A construction method for an underwater bridge pier cap compartmentalized construction structure, characterized in that, The specific steps include the following: (1) Prepare the underwater bridge pier compartmentalized construction structure, including pontoons, several connecting cylinders, and isolation chambers, and equip it with construction equipment and materials. The underwater bridge pier compartmentalized construction structure is as follows: An isolation chamber is used to create a dry environment that partially isolates the surrounding water at the designed location of an underwater bridge pier foundation. The cross-sectional shape of the isolation chamber is the same as the designed cross-sectional shape of the bridge pier foundation, but the perimeter of the isolation chamber is greater than the designed perimeter of the bridge pier foundation. The isolation chamber is a steel chamber body that is sealed with steel plates at the top and around the perimeter and open at the bottom. The outer shell of the steel chamber body is equipped with a steel frame composed of horizontal and vertical steel frames intersecting at right angles. The upper middle part of the steel chamber body is equipped with an isolation chamber inlet / outlet cylinder that communicates with the upper interior of the isolation chamber. The upper end of the isolation chamber inlet / outlet cylinder is equipped with a docking flange. The four corners of the outer side of the isolation chamber are equipped with pressure rods and lifting lugs. The upper end of the pressure rod is higher than the top of the isolation chamber and is equipped with a pressure plate. The lower end of the isolation chamber is equipped with an annular pointed foot. The inner lower perimeter wall of the steel chamber body is equipped with a sealing ring seat, and the outer side of the sealing ring seat is equipped with an inflatable sealing ring. The connecting cylinder is used to isolate the water layer around the inlet / outlet cylinder of the isolation chamber and the pontoon. The connecting cylinder is made of steel plate pressed into a cylindrical shape. Both ends of the steel cylinder are equipped with connecting flanges. Several connecting cylinders are connected in series. A rubber waterproof ring is provided between each connecting flange. Each connecting flange is connected to a fastening nut by fastening bolts passing through the bolt holes on the connecting flange and the rubber waterproof ring. During the construction of the isolation chamber, the upper end of the connected connecting cylinders is located on the upper water surface in the sinkhole of the isolation chamber. The pontoon is used to carry, lower, and support construction operations inside the isolation chamber. During the construction of the isolation chamber, the pontoon is located on the water surface above the isolation chamber. The pontoon is a hollow hull shape with an isolation chamber sinking hole in the middle. The isolation chamber rises and falls in the isolation chamber sinking hole. The pontoon decks on both sides of the isolation chamber sinking hole are equipped with rails for gantry cranes to run on. At least two gantry cranes are installed on the rails. The four corner decks of the isolation chamber sinking hole are equipped with pressing devices corresponding to the isolation chamber pressure rods. Anchor boxes are installed at the four corners of the pontoon. The pontoon decks on both sides of the isolation chamber sinking hole between the two rails are divided into unloading area and storage area. The pontoon decks are also equipped with power generation equipment, gas supply equipment, water pumping and sludge suction equipment, mixing equipment, and control room. The pier foundation is located inside the isolation chamber, and the distance between the side of the pier foundation and the corresponding part of the isolation chamber is 50cm to 100cm. The inner side of the sealing ring seat is sealed to the lower end of the corresponding steel chamber body. The outer side of the sealing ring seat is a concave arc surface. The inner side of the inflatable sealing ring is sealed to the concave arc surface of the sealing ring seat. The outer side of the inflatable sealing ring after inflation is supported on the side of the completed bridge pier foundation. A sealing oil layer is provided on the side of the bridge pier foundation. The height of the inner wall of the isolation chamber is equal to the sum of the soil penetration depth at the lower end of the isolation chamber and the construction height of more than 10m inside the isolation chamber. (2) The underwater pier compartmentalized construction structure is towed by tugboat to the upper end of the designed pier pile foundation, or the upper end of the designed and completed pier pile foundation, and the pontoon is anchored and fixed. (3) Start the crane to slowly and vertically lower the isolation chamber into the water in the isolation chamber sink hole. When the upper end of the isolation chamber inlet and outlet cylinder is at the upper end of the water surface in the isolation chamber sink hole, stop the descent of the isolation chamber and build a construction gangway platform on the deck around the outer perimeter of the upper perimeter of the isolation chamber inlet and outlet cylinder and the perimeter of the isolation chamber sink hole. (4) A connecting tube is sealed and connected in series at the upper port of the inlet and outlet of the isolation chamber. A rubber waterproof ring is provided between the two connecting flanges. The lower port of the connecting tube passes through the connecting flange, the fastening bolt passes through the bolt holes on the two connecting flanges and the screw holes on the rubber waterproof ring, and is then screwed and sealed with the fastening nut to form a whole, so that the connecting tube is sealed and connected in series with the upper port of the inlet and outlet of the isolation chamber. (5) Slowly lower the isolation chamber until the upper end of the connected docking cylinder is located above the water surface in the sinkhole of the isolation chamber, and then connect another docking cylinder in series on the top of the upper docking cylinder according to the connection method in step (4). (6) Repeat step (5) until the lower end of the isolation chamber is driven into the mud around the pier pile foundation. Use the pressing device located on the four corner decks of the isolation chamber sink hole to press down the pressure plate located on the pressure rod at the four corners of the isolation chamber, so that the lower end of the isolation chamber sinks horizontally and evenly to the predetermined depth, and the upper end of the connected docking cylinder is located on the upper water surface in the sink hole of the isolation chamber. (7) Start the pumping and sludge suction equipment to drain the water in the isolation chamber and the docking cylinder and suck out the mud and water at the bottom of the isolation chamber to ensure that a dry construction environment is formed in the isolation chamber. Fresh air, power supply equipment and lighting are supplied to the underwater hollow isolation chamber through the axial flow fan on the deck. Construction equipment, construction materials and construction personnel are input into the isolation chamber through the docking cylinder and the isolation chamber inlet and outlet cylinder using a crane and bucket. (8) Complete the pile head removal, pile foundation testing, cushion layer construction, reinforcement binding, and erection of the pier cap formwork at the lower end of the isolation chamber, and pour the pier cap concrete. The upper surface of the pier cap concrete poured each time is located at the upper end of the isolation chamber. (9) After the concrete of the pier foundation reaches a certain strength, remove the formwork of the pier foundation, apply a sealing oil layer to each side wall of the pier foundation, and slowly lift the isolation chamber with a crane, wire rope and lifting lug until the inflatable sealing ring at the lower end of the isolation chamber is parallel or in contact with the lower end of the side wall of the pier foundation. Inflate and pressurize the inflatable sealing ring so that the inflatable sealing ring seals the gap between the lower end of the isolation chamber and the side wall of the pier foundation. Slowly lift the isolation chamber to the upper part of the completed side wall of the pier foundation and remove the connecting cylinder above the water surface in the sinkhole of the isolation chamber. (10) Continue to extend the pier foundation on the completed pier foundation in the isolation chamber, including steel bar binding, erecting pier foundation formwork, and pouring pier foundation concrete. The upper end of each pier foundation concrete pour is located at the upper end of the isolation chamber. (11) Repeat steps (9) and (10) until the upper surface of the completed pier foundation is higher than the water level in the sinkhole of the isolation chamber. Remove the construction equipment and materials from the isolation chamber and tow the underwater pier compartment construction structure to the upper part of the next designed pier pile foundation by tugboat for construction.

2. The method according to claim 1, characterized in that: The sealing oil layer is butter.

3. The method according to claim 1, characterized in that: The aforementioned pressing device is a rotary drilling rig or an impact drilling rig.

4. The method according to claim 1, characterized in that: The lower inner end of the steel silo body is provided with 1 to 3 sealing ring seats and an inflatable sealing ring structure.

5. The method according to claim 1, characterized in that: The two end planes of the docking cylinder protrude from the outer plane of the corresponding docking flange.

6. The method according to claim 1, characterized in that: The lower outer perimeter of the isolation chamber inlet and outlet cylinder is provided with several reinforcing angle steel plates distributed at intervals between the corresponding upper end of the steel chamber body.

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