An onshore connection structure for underwater section-by-section installation of an anchored floating tunnel

Abstract

The present invention discloses a shore connection structure for underwater section-by-section installation of an anchored floating tunnel, which comprises an indoor part, an outdoor part, a jacking device, a pair of tracks, a pair of track groove sealing devices and a water supply and drainage system. The indoor part is provided with a jacking chamber, a partition wall and an outfitting chamber; the rear end of the jacking chamber is a water-facing side wall; the front end of the outfitting chamber is a water-facing side wall, and a connecting section tunnel is arranged at the lower part of the outfitting chamber; an outfitting chamber inlet is opened on the partition wall and blocked by an inlet end sealing door; an outfitting chamber outlet is opened on the water-facing side wall and blocked by an outlet end sealing door; the outdoor part comprises a starting section tunnel and a slope protection which are sequentially connected to the front port of the connecting section tunnel; the jacking device is installed at the bottom of the jacking chamber; a pair of tracks are installed on the top surfaces of the connecting section tunnel and the starting section tunnel; a pair of track groove sealing devices are arranged at the bottom of the outfitting chamber outlet corresponding to the pair of tracks one by one; the water supply and drainage system is arranged between the outfitting chamber and the external water body. The present invention can realize functions such as the transportation and outfitting of the floating tunnel pipe sections.

Description

Technical Field

[0001] The present invention relates to a shore connection structure for underwater section-by-section installation of an anchored floating tunnel. Background Art

[0002] A submerged floating tunnel, with the English name "Submerged Floating Tunnel" and abbreviated as "SFT", is also called "Archimedes Bridge" and abbreviated as "PDA" bridge in Italy. Generally, it consists of a tubular structure floating at a certain depth in water (the space of this structure is large enough to meet the requirements of road and railway traffic), a support system (anchor cables anchored on the seabed foundation, piers or floating boxes on the water), and structures on both banks. It is a new type of structure for transportation means to cross between two banks separated by deep water, applicable to all transportation vehicles that need to travel through water, allowing trains, cars, small motor vehicles and pedestrians to pass, and can also be made into a service passage for various pipelines and cables. The difference between a submerged floating tunnel and a traditional immersed tunnel or driven tunnel is that the floating tunnel structure is surrounded by water, neither located on the ground nor passing through the ground, but mainly relying on its own structural gravity, the buoyancy received by the structure, and the anchoring force of the support system to maintain a fixed position. The submerged floating tunnel is sealed all around, and this structure has all the characteristics of an ordinary tunnel and should be considered a "tunnel" rather than a "bridge" from the perspective of use.

[0003] A floating tunnel can cross different water areas, such as rivers, fjords, straits, lakes, etc., providing a possible and acceptable fixed crossing structure form for places that are considered impassable due to deep water or large distances between the two banks. The floating tunnel is built at a certain depth underwater. Compared with surface open channels and ferry transports, bad weather such as strong winds and waves, fog, rain, and snow will not affect the all-weather operation of the floating tunnel. On the premise of ensuring the same navigation capacity, compared with bridges, the floating tunnel has a gentler slope and a shorter total length. The floating tunnel will not affect the environment and natural landscape during the construction process and in use; when the span and water depth exceed a certain value, the unit cost of the floating tunnel will not increase significantly with the increase in the length of the crossing channel or the depth of the waterway, while the unit cost of cable-stayed bridges and suspension bridges will increase significantly with the increase in the span.

[0004] Although the floating tunnel has certain advantages compared with cross - sea channels such as immersed tunnels, deep - buried tunnels, and bridges, the design and construction of the floating tunnel are still a worldwide problem, and there is no completed floating tunnel yet. Currently, 7 countries in the world (Norway, Italy, Japan, China, Switzerland, Brazil, and the United States) are researching. Many technical problems found in the research mainly include: overall structural layout, tunnel materials, structural types of the anchoring system, connection types of the tunnel and the shore - connecting structure design, feasibility of the tunnel structure, construction and operation risks, etc. Whether these problems can be solved determines whether the floating tunnel can move from a feasible plan to an actual project.

[0005] So far, in the research of floating tunnels, according to the relationship between the self - gravity of the floating tunnel and the buoyancy it receives, the proposed structural types can be roughly divided into three categories: buoy - type, anchored - type, and pier - type. The buoy - type floating tunnel suspends the tunnel on buoys on the water surface through cables or anchor chains. The gravity of the tunnel is greater than the buoyancy, and it is greatly affected by the rise and fall of the water level in the vertical direction. The anchored - type floating tunnel anchors the tunnel to an anchor foundation below the seabed through tension legs or cables. The gravity of the tunnel is less than the buoyancy, and the tunnel will displace or sway under hydrodynamic action. The pier - type is actually a tunnel bridge supported on underwater piers, with high construction difficulty and high cost.

[0006] Currently, long - term research has been carried out on the structure of the anchored - type floating tunnel at home and abroad. It consists of an underwater floating tunnel tube body, a shore - connecting structure, an anchoring system, a floating - to - weight ratio adjustment system, tunnel auxiliary facilities, etc. Cable anchors are set on the tunnel segments and fixed to the seabed through the anchoring foundation. Both ends of the tunnel segments are connected to the shore - connecting structure and connected to the ground road through a land - based slope tunnel.

[0007] Since the floating tunnel is located at a relatively deep underwater position, the construction difficulty of transporting the tunnel segments, underwater positioning, and underwater or over - water installation and docking is very high for all three types of floating tunnels, and the safety risk is also very high. There is no mature construction technology that has been successfully implemented. The technology that can be referred to for the installation construction of the floating tunnel is the over - water floating transportation, over - water sinking, and barge - sinking installation of the immersed tunnel. This process is greatly affected by wind, waves, currents, and ship - generated waves. For example, there is only one window period per month for the floating transportation and installation of the immersed tubes of the Hong Kong - Zhuhai - Macao Bridge, and the waterway needs to be closed during the floating transportation of the tunnel segments, which has a great impact on water transportation, high construction costs, and high safety risks.

[0008] In order to fill the gap in the technology of underwater sequential installation of floating tunnel segments, a construction method for underwater sequential installation of an anchored - type floating tunnel is specifically proposed. Since the implementation of this construction method mostly needs to be carried out within the shore - connecting structure, a shore - connecting structure suitable for this construction method needs to be developed. Summary of the Invention

[0009] The object of the present invention is to fill the gap in the existing technology, and a shore connection structure for underwater section-by-section installation of an anchored floating tunnel is particularly proposed, which can realize functions such as transportation and outfitting of the floating tunnel segments, and provide a safer, more efficient and more economical supporting structure for the installation of the floating tunnel.

[0010] The object of the present invention is achieved as follows: A shore connection structure for underwater section-by-section installation of an anchored floating tunnel, which includes an indoor part, an outdoor part, a jacking device, a pair of tracks, a pair of track groove sealing devices and a water supply and drainage system; wherein,

[0011] The indoor part is successively provided with a jacking chamber, a partition wall and an outfitting chamber from the land area to the sea area; the rear end of the jacking chamber is the back water side wall of the indoor part, and a hole communicating with the land slope section tunnel is opened at the lower part of the back water side wall; the front end of the outfitting chamber is the water-facing side wall of the indoor part, and a connecting section tunnel is provided at the lower part of the outfitting chamber, and the rear port of the connecting section tunnel communicates with the jacking chamber; the partition wall opens an outfitting chamber inlet directly above the rear port of the connecting section tunnel, and the outfitting chamber inlet is blocked by an inlet end sealing door; the water-facing side wall opens an outfitting chamber outlet directly above the front port of the connecting section tunnel, and the outfitting chamber outlet is blocked by an outlet end sealing door;

[0012] The outdoor part includes a starting section tunnel and a slope protection successively connected to the front port of the connecting section tunnel; the front end of the starting section tunnel is docked with the rear end of the floating tunnel segment, and steel sealing doors are provided at the joints of the starting section tunnel and the connecting section tunnel and at the joints of the starting section tunnel and the floating tunnel segment;

[0013] The jacking device is installed at the bottom of the jacking chamber;

[0014] A pair of tracks are installed on the top surface of the connecting section tunnel and the top surface of the starting section tunnel, and the pair of tracks correspond one-to-one with a pair of tracks provided on the top surface of the floating tunnel segment;

[0015] A pair of track groove sealing devices are provided at the bottom of the outfitting chamber outlet corresponding one-to-one with the pair of tracks;

[0016] The water supply and drainage system is provided between the outfitting chamber and the external water body.

[0017] For the above-mentioned shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein, the back water side wall, the water-facing side wall and the left and right outer walls of the indoor part are all diaphragm wall structures; the partition wall, the left and right side walls of the jacking chamber, the left and right side walls of the outfitting chamber, and the top plate and bottom plate of the indoor part all adopt cast-in-place reinforced concrete structures.

[0018] The above shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein steel door frames and rubber waterstops are provided at both the outfitting room inlet on the partition wall and the outfitting room outlet on the water-facing side wall; the inlet end sealing door is of a steel plate door structure; and the outlet end sealing door is of a reinforced concrete caisson structure with multiple compartments.

[0019] The above shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein the outlet end sealing door consists of a bottom plate and surrounding side walls to form a caisson shell, and the caisson shell is divided into multiple compartments by a number of transverse partition walls and longitudinal partition walls. A number of through holes are spaced along the height direction on the transverse partition walls and longitudinal partition walls, and a connecting valve is installed in each through hole; the top elevation of the outlet end sealing door is 2 - 3 m higher than the highest water level of the external water body + wave height + surplus height, the width of the outlet end sealing door is the width of the outfitting room outlet + at least 8 m, and the thickness of the outlet end sealing door should meet the stability requirements for installation, removal and bottom seating.

[0020] The above shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein the track groove sealing device includes a steel shell for accommodating the track, a pair of hydraulic jacks and a pair of steel piston heads; the steel shell is embedded in the water-facing side wall; the pair of hydraulic jacks are horizontally and symmetrically installed on both sides of the steel shell; the pair of steel piston heads are symmetrically installed on the piston rods of the pair of hydraulic jacks, and cavities matching the side shape of the track are provided on the front end faces of the pair of steel piston heads, and rubber waterstops are provided on the surfaces of the cavities.

[0021] The above shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein a number of anchor bars inserted into the water-facing side wall are welded on the outer surfaces and bottom surface around the steel shell of the track groove sealing device.

[0022] The above shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein the land slope section tunnel is constructed by the mining method with a cast-in-situ lining structure.

[0023] The above shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein the inner diameter of the connection section tunnel is the same as that of the floating tunnel segment. The connection section tunnel is of a cast-in-situ reinforced concrete structure and the wall thickness should meet the load requirements of the outfitting room. The bottom of the connection section tunnel is anchored to the bottom plate of the indoor part, and the left and right sides of the connection section tunnel are anchored to the left and right side walls of the outfitting room.

[0024] The above shore connection structure for underwater section-by-section installation of an anchored floating tunnel, wherein the inner diameter of the starting section tunnel is the same as that of the floating tunnel segment. The starting section tunnel is of a reinforced concrete structure and is precast and then installed.

[0025] The above shore connection structure for underwater sequential installation of the anchored floating tunnel, wherein the revetment is a riprap structure constructed by means of underwater riprap placement, slope trimming, ramming and leveling.

[0026] The shore connection structure for underwater sequential installation of the anchored floating tunnel of the present invention has the following characteristics:

[0027] (1) The shore connection structure described in the present invention can realize functions such as the transportation and outfitting of the floating tunnel pipe sections, and is an important supporting structure for the underwater sequential installation of the anchored floating tunnel, filling the technical gap in the underwater sequential installation of the floating tunnel;

[0028] (2) It greatly reduces the influence of wind, waves and currents on the transportation of the floating tunnel pipe sections, greatly increases the transportation window period of the floating tunnel pipe sections, and improves the transportation efficiency and safety;

[0029] (3) It significantly reduces the influence of wind, waves and currents on the sinking and docking of the floating tunnel pipe sections, can effectively avoid the pendulum effect, greatly increases the sinking and installation window period of the floating tunnel pipe sections, and improves the installation efficiency, safety and accuracy of the floating tunnel pipe sections;

[0030] (4) The frequency of using construction vessels in the installation construction of the floating tunnel pipe sections is relatively low, and basically no large ship machinery is required. Therefore, it has little impact on the passage of surface vessels, and at the same time can greatly reduce the maritime traffic safety risk and can greatly shorten the construction period, effectively reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a side view (during tunnel construction period) of the shore connection structure for underwater sequential installation of the anchored floating tunnel of the present invention;

[0032] Figure 2 is a cross-sectional view of the outlet end seal door in the shore connection structure of the present invention;

[0033] Figure 3 is a plan view of the outlet end seal door in the shore connection structure of the present invention;

[0034] Figure 4 is a cross-sectional view (open state) of the track groove sealing device in the shore connection structure of the present invention;

[0035] Figure 5 is a cross-sectional view (closed state) of the track groove sealing device in the shore connection structure of the present invention;

[0036] Figure 6a is a state diagram of step one in the working process of the shore connection structure of the present invention during the floating tunnel construction period;

[0037] Figure 6bIt is the state diagram of Step 2 in the working process of the shore connection structure of the present invention during the construction period of the suspended tunnel;

[0038] Figure 6c It is the state diagram of Step 3 in the working process of the shore connection structure of the present invention during the construction period of the suspended tunnel;

[0039] Figure 6d It is the state diagram of Step 4 in the working process of the shore connection structure of the present invention during the construction period of the suspended tunnel;

[0040] Figure 6e It is the state diagram of Step 5 in the working process of the shore connection structure of the present invention during the construction period of the suspended tunnel;

[0041] Figure 6f It is the state diagram of Step 6 in the working process of the shore connection structure of the present invention during the construction period of the suspended tunnel;

[0042] Figure 7 It is the side view (during the operation period of the tunnel) of the shore connection structure for the underwater section-by-section installation of the anchored suspended tunnel of the present invention. Detailed implementation manners

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] Please refer to Figures 1 to 5 , the shore connection structure for the underwater section-by-section installation of the anchored suspended tunnel of the present invention includes an indoor part 3, an outdoor part, a jacking device 9, a pair of tracks 8, a pair of track groove sealing devices 8A, and a water supply and drainage system 10.

[0045] The indoor part 3 is enclosed by the water-facing side wall 3B, the water-back side wall 3A of the impermeable diaphragm wall structure, and the left and right outer walls; the indoor part 3 is successively provided with a jacking chamber 31, a partition wall 30, and an outfitting chamber 32 from the land area to the sea area; among them,

[0046] The partition wall 30, the left and right side walls of the jacking chamber, the left and right side walls of the outfitting chamber, and the top and bottom plates of the indoor part 3 are all made of cast-in-place reinforced concrete structures.

[0047] The length and width of the jacking chamber 31 should be designed according to the length and diameter of the suspended tunnel segment 1; the rear end of the jacking chamber 31 is the water-back side wall 3A, and a hole communicating with the land slope section tunnel 2 is opened at the lower part of the water-back side wall 3A; the land slope section tunnel 2 is the connecting tunnel between the jacking chamber 31 and the ground road; the land slope section tunnel 2 is constructed by the mining method and has a cast-in-place lining structure;

[0048] The length and width of the outfitting chamber 32 shall be designed according to the length and diameter of the floating tunnel segment 1 and the size of the installation trolley 13, with a certain margin. The front end of the outfitting chamber 32 is the water-facing side wall 3B. A connecting section tunnel 5 is provided at the lower part of the outfitting chamber 32. The rear port of the connecting section tunnel 5 communicates with the jacking chamber 31. The connecting section tunnel 5 is of cast-in-place reinforced concrete structure. The inner diameter of the connecting section tunnel 5 is the same as that of the floating tunnel segment 1. The wall thickness of the connecting section tunnel 5 shall meet the load requirements of the outfitting chamber 32. The bottom of the connecting section tunnel 5 is anchored to the floor of the indoor part, and the left and right sides of the connecting section tunnel 5 are anchored to the left and right side walls of the outfitting chamber.

[0049] The partition wall 30 opens an outfitting chamber inlet directly above the rear port of the connecting section tunnel 5. The outfitting chamber inlet is provided with a steel door frame and a rubber water stop strip, and the outfitting chamber inlet is blocked by the inlet end sealing door 11. The inlet end sealing door 11 is of steel plate door structure, with rubber water stop strips arranged around to prevent water leakage when the door is closed. The size of the inlet end sealing door 11 is designed according to the diameter of the floating tunnel segment 1, with a certain margin. The strength and stiffness of the inlet end sealing door 11 shall meet the requirements of the water pressure when it is closed.

[0050] The water-facing side wall 3B opens an outfitting chamber outlet directly above the front port of the connecting section tunnel 5. The outfitting chamber outlet is provided with a steel door frame and a rubber water stop strip, and the outfitting chamber outlet is blocked by the outlet end sealing door 12.

[0051] The outlet end sealing door 12 is a reinforced concrete caisson structure with multiple compartments. The outlet end sealing door 12 consists of a bottom plate 120 and surrounding side walls 121 to form a caisson shell. The caisson shell is divided into multiple compartments by a number of transverse partition walls 122 and a number of longitudinal partition walls 123. A number of through holes are opened at intervals in the height direction on the transverse partition walls 122 and the longitudinal partition walls 123, and a connecting valve 124 is installed in each through hole (see Figure 2 and Figure 3 ); it is convenient to control the liquid level elevation of each compartment in the caisson when injecting and draining water into the caisson. The outlet end sealing door 12 is sunk or floated by injecting and draining water into multiple compartments. After the outlet end sealing door 12 floats up, it is moved and positioned by a tugboat for installation. When injecting water into the caisson cannot meet the stability requirements, the self-weight of the outlet end sealing door 12 can also be increased by backfilling sand and gravel into the caisson. The top elevation of the outlet end sealing door 12 shall be higher than the highest water level of the external water body + wave height + margin height by 2 - 3m. The width of the outlet end sealing door 12 is the width of the outfitting chamber outlet + at least 8m, that is, the width of the outlet end sealing door 12 shall extend at least 4m on both sides of the outfitting chamber outlet. The thickness of the outlet end sealing door 12 shall meet the stability requirements for installation, removal and bottom seating.

[0052] The construction method of the outfitting room exit is to first construct the diaphragm wall retaining structure on the water-facing side of the shore connection structure, and then excavate in layers with support to form a foundation pit. Machinery is used in combination with manual labor to cut the water-facing side wall 3B to form a rectangular outfitting room exit. The steel door frame of the outfitting room exit has embedded parts pre-embedded during the construction of the diaphragm wall. After the cutting of the outfitting room exit is completed, the steel door frame and the rubber water stop strip are installed, and the gap between the steel door frame and the diaphragm wall is sealed through a grouting process. The surface flatness of the installed steel door frame should be less than 3 mm / m. After all the construction of the outfitting room exit is completed, the foundation pit retaining structure is demolished.

[0053] The outdoor part includes a starting section tunnel 6 and a slope protection 7 that are successively connected to the front port of the connecting section tunnel 5; among them,

[0054] The inner diameter of the starting section tunnel 6 is the same as that of the floating tunnel segment 1. The starting section tunnel 6 adopts a reinforced concrete structure and is precast first and then installed; the front end of the starting section tunnel 6 is butt-jointed with the rear end of the floating tunnel segment 1. Steel sealing doors are provided at the joints between the starting section tunnel 6 and the connecting section tunnel 5 and at the joints between the starting section tunnel 6 and the floating tunnel segment 1.

[0055] The slope protection 7 adopts a riprap structure and is constructed by means of underwater riprap, slope trimming, ramming and leveling processes.

[0056] The jacking device 9 is installed at the bottom of the jacking chamber 31; the jacking device 9 includes a number of jacks and a steel structure jacking beam installed on the number of jacks.

[0057] A pair of tracks 8 are installed on the top surface of the connecting section tunnel 5 and the top surface of the starting section tunnel 6. This pair of tracks 8 corresponds one-to-one with a pair of tracks provided on the top surface of each floating tunnel segment 1; the cross-section of the track 8 is in the shape of an I.

[0058] A pair of track groove sealing devices 8A are provided at the bottom of the outfitting room exit corresponding one-to-one with the pair of tracks 8; the track groove sealing device 8A is used to block the gaps on both sides of the track 8 and, together with the exit end sealing door 12, form a sealed water-blocking system for the outfitting room 32 to prevent the water outside the indoor part from entering the outfitting room 32.

[0059] The track groove sealing device 8A includes a steel housing 80, a pair of hydraulic jacks 82, and a pair of steel piston heads 153. Among them, the steel housing 80 includes a bottom plate, two vertical plates respectively connected to both sides of the bottom plate, and a left top plate and a right top plate respectively connected to the tops of the two vertical plates, so that the top of the steel housing 80 has a notch with a width greater than the cross-sectional width of the track 8. The bottom surface of the steel housing 80, the outer surfaces of the two vertical plates, the outer surface of the left top plate, and the outer surface of the right top plate are all welded with a number of anchor bars 81, so that the steel housing 80 is fixed in the water-facing side wall 3B through the anchor bars; the track 8 is fixed in the middle of the bottom plate of the steel housing 80; a pair of hydraulic jacks 82 are symmetrically installed in the middle of the inner surfaces of the two vertical plates of the steel housing 80; a pair of steel piston heads 83 are symmetrically installed on the piston rods of the pair of hydraulic jacks 82. The top surfaces of the pair of steel piston heads 83 are movably and sealingly contacted with the bottom surfaces of the left top plate and the right top plate of the steel housing 80 respectively, the bottom surfaces of the pair of steel piston heads 83 are movably and sealingly contacted with the top surface of the bottom surface of the steel housing 80, and a cavity matching the side shape of the track 8 is provided on the front end surfaces of the pair of steel piston heads 83, and a rubber water stop strip 84 is installed on the surface of the cavity (see Figure 4 and Figure 5 ), to ensure the water stop effect; the anchor bars 81 on the outer surface of the steel housing 80 are used to strengthen the connection force with the surrounding concrete. The track groove sealing device 8A is constructed synchronously with the outlet of the outfitting room. After being fabricated in the processing plant, it is transported to the construction site and then installed integrally. The installation work of the track groove sealing device 8A is carried out under the dry construction conditions in the foundation pit. After the installation is completed, the concrete of the water-facing side wall 3B is poured.

[0060] The water supply and drainage system 10 is arranged between the outfitting room 32 and the external water body; the water supply and drainage system 10 includes a high-power and high-lift water pump arranged in the outfitting room 32 and a water pipe connected to the water outlet of the water pump and leading to the water body in front of the water-facing side wall 3B. The water in the outfitting room 32 is pumped out by the water pump, and water can also be injected into the outfitting room 32 through the water supply pipeline to realize the dry-wet conversion function of the outfitting room 32.

[0061] The shore connection structure for the underwater section-by-section installation of an anchored floating tunnel according to the present invention keeps the steel sealing door on the outermost side of the floating tunnel segment 1 closed during the construction period of the floating tunnel, ensuring that water will not backflow from inside the floating tunnel segment 1 into the indoor part 3 of the shore connection structure; the outfitting chamber 32 functions as the connection between the shore connection structure and the outer water body. The dry-wet conversion of the outfitting chamber 32 is realized through the inlet end sealing door 11 and the outlet end sealing door 12, while ensuring that the indoor part 3 of the shore connection structure is always in a dry construction state. The outfitting chamber 32 is the key structure for the floating tunnel segment 1 to transition from land to water. When the inlet end sealing door 11 is closed and the outfitting chamber 32 is filled with water, the outlet end sealing door 12 is opened, and the outfitting chamber 32 can communicate with the water area on the water-facing side; when the outlet end sealing door 12 and the track groove sealing device 8A are closed, the accumulated water in the outfitting chamber 32 is drained through the water supply and drainage system 10, and the inlet end sealing door 11 is opened, and the outfitting chamber 32 can communicate with the land slope tunnel 2. This design can ensure that seawater will not backflow into the indoor part 3 of the shore connection structure and the land slope tunnel 2 during the entire dry-wet conversion process.

[0062] During the installation and construction period of the tunnel segment, the working steps of the shore connection structure are as follows:

[0063] Step 1: First, close the inlet end sealing door 11. At the same time, block the outlet of the outfitting chamber through the outlet end sealing door 12 and the track groove sealing device 8A. Then, drain the water in the outfitting chamber 32 through the water supply and drainage system 10 to form a dry construction environment. Next, open the inlet end sealing door 11. Assemble and position the installation trolley 4 in the outfitting chamber 32. Then, transport the floating tunnel segment 1' to be installed from the land slope tunnel 2 to the lifting device 9 in the lifting chamber 31 (see Figure 6a ).

[0064] Step 2: Complete the vertical movement of the floating tunnel segment 1' to be installed through the jacks of the lifting device 9 (see Figure 6b ).

[0065] Step 3: First, insert the lifting airbag between the floating tunnel segment 1' to be installed and the lifting beam of the lifting device 9. After the lifting airbag is inflated, move the floating tunnel segment 1' to be installed forward horizontally into the installation trolley 4, and then fix the floating tunnel segment 1' to be installed to the installation trolley 4 (see Figure 6c ).

[0066] Step 4: Close the inlet end seal door 11, fill the outfitting chamber 32 with water through the water supply and drainage system 10, and adjust the buoyancy-to-weight ratios of the suspended tunnel segment 1' to be installed and the installation trolley 4, so that the buoyancy-to-weight ratio of the suspended tunnel segment 1' to be installed is slightly less than 1, the buoyancy-to-weight ratio of the installation trolley 4 is slightly greater than 1, and the overall buoyancy-to-weight ratio of the installation trolley 4 and the suspended tunnel segment 1' to be installed is slightly greater than 1, so as to ensure that the buoyancy of the suspended tunnel segment 1' to be installed is slightly less than its gravity, so that no additional vertical load needs to be provided during the installation and submergence process of the suspended tunnel segment 1' to be installed, and at the same time ensure that the installation trolley 4 always maintains a buoyancy greater than its gravity during the process of traveling and installing the tunnel segment and will not sink. Then open the outlet end seal door 12 and the track seal device 8A (see Figure 6d );

[0067] Step 5: Drag the suspended tunnel segment 1' to be installed along a pair of tracks 8 by the installation trolley 13 to the installation position (see Figure 6e );

[0068] Step 6: Connect the rear end of the suspended tunnel segment 1' to be installed to the front end of the starting tunnel segment 6 or the front end of the already installed suspended tunnel segment 1. After the installation is completed, the installation trolley 4 retreats to the outfitting chamber 32, closes the outlet end seal door 12 and the track groove seal device 8A, drains the outfitting chamber 32 through the water supply and drainage system 10 to form a dry construction condition, and opens the inlet end seal door 11;

[0069] Step 7: Repeat Steps 1 to 6 to install the next suspended tunnel segment 1 (see Figure 6f ); After all the suspended tunnel segments 1 are installed, remove the installation trolley 4, seal the outlet of the outfitting chamber with cast-in-place reinforced concrete, and complete the construction of the cast-in-place reinforced concrete tunnel section 3C at the lower part of the jacking chamber 31 (see Figure 7 ), so as to achieve the full penetration of the suspended tunnel and give play to the function of the conversion structure between the suspended tunnel and the land road.

[0070] The above embodiments are only for illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by each claim.

Claims

1. An onshore connection structure for underwater section-by-section installation of an anchored floating tunnel, comprising an indoor part, an outdoor part, a jacking device, a pair of tracks, a pair of track groove sealing devices, and a water supply and drainage system; characterized in that, The indoor part is successively provided with a jacking chamber, a partition wall, and an outfitting chamber from the land area to the sea area; the rear end of the jacking chamber is the backwater side wall of the indoor part, and a hole communicating with the land slope section tunnel is opened at the lower part of the backwater side wall; the front end of the outfitting chamber is the water-facing side wall of the indoor part, and a connecting section tunnel is provided at the lower part of the outfitting chamber, and the rear port of the connecting section tunnel communicates with the jacking chamber; the partition wall opens an outfitting chamber inlet directly above the rear port of the connecting section tunnel, and the outfitting chamber inlet is blocked by an inlet end sealing door; the water-facing side wall opens an outfitting chamber outlet directly above the front port of the connecting section tunnel, and the outfitting chamber outlet is blocked by an outlet end sealing door; The outdoor part includes a starting section tunnel and a slope protection successively connected to the front port of the connecting section tunnel; the front end of the starting section tunnel is docked with the rear end of the floating tunnel segment, and steel sealing doors are provided at the joints between the starting section tunnel and the connecting section tunnel and at the joints between the starting section tunnel and the floating tunnel segment; The jacking device is installed at the bottom of the jacking chamber; A pair of tracks are installed on the top surfaces of the connecting section tunnel and the starting section tunnel, and the pair of tracks correspond one by one to a pair of tracks provided on the top surface of the floating tunnel segment; A pair of track groove sealing devices are provided at the bottom of the outfitting chamber outlet corresponding to the pair of tracks one by one; The water supply and drainage system is provided between the outfitting chamber and the external water body.

2. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 1, wherein The backwater side wall, the water-facing side wall, and the left and right outer walls of the indoor part are all diaphragm wall structures; the partition wall, the left and right side walls of the jacking chamber, the left and right side walls of the outfitting chamber, and the top and bottom plates of the indoor part are all made of cast-in-place reinforced concrete structures.

3. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 1, characterized in that, Steel door frames and rubber waterstops are provided at the outfitting chamber inlet on the partition wall and the outfitting chamber outlet on the water-facing side wall; the inlet end sealing door is a steel plate door structure; the outlet end sealing door is a multi-compartment reinforced concrete caisson structure.

4. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 3, characterized in that, The outlet end sealing door consists of a bottom plate and surrounding side walls to form a caisson shell, and the caisson shell is divided into multiple compartments by a number of transverse partition walls and longitudinal partition walls. A number of through holes are opened at intervals in the height direction on the transverse partition walls and longitudinal partition walls, and a connecting valve is installed in each through hole; the top elevation of the outlet end sealing door is higher than the highest water level of the external water body + wave height + surplus height by 2 - 3m, the width of the outlet end sealing door is the width of the outfitting chamber outlet + at least 8m, and the thickness of the outlet end sealing door should meet the stability requirements for installation, removal, and bottom seating.

5. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 1, characterized in that, The track groove sealing device includes a steel shell for accommodating the track, a pair of hydraulic jacks, and a pair of steel piston heads; the steel shell is embedded in the water-facing side wall; a pair of hydraulic jacks are horizontally and symmetrically installed on both sides of the steel shell; a pair of steel piston heads are symmetrically installed on the piston rods of the pair of hydraulic jacks, and the front end faces of the pair of steel piston heads are provided with cavities that match the side shape of the track, and rubber waterstops are provided on the surface of the cavities.

6. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 5, characterized in that A number of anchor bars inserted into the water-facing side wall are welded on the outer surfaces around the steel outer shell of the track groove sealing device and on the bottom surface.

7. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 1, wherein The land slope section tunnel is constructed by the mining method with a cast-in-place lining structure.

8. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 1, characterized in that, The inner diameter of the connecting section tunnel is the same as that of the floating tunnel segment. The connecting section tunnel is of a cast-in-place reinforced concrete structure and the wall thickness shall meet the load requirements of the outfitting room. The bottom of the connecting section tunnel is anchored to the floor slab of the indoor part, and the left and right sides of the connecting section tunnel are anchored to the left and right side walls of the outfitting room.

9. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 1, characterized in that, The inner diameter of the starting section tunnel is the same as that of the floating tunnel segment. The starting section tunnel is of a reinforced concrete structure and is precast and then installed.

10. The shore connection structure for underwater section-by-section installation of an anchored floating tunnel according to claim 1, characterized in that, The slope protection is of a riprap structure and is constructed by the processes of underwater riprap placement, slope trimming, ramming and leveling.

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