Surface anchored anti-tensioned anchor cable system supporting suspended tunnel structure and construction method

Abstract

The invention relates to the technical field of underwater tunnel traffic, and provides a surface anchorage type anti-tension anchor cable system supporting a suspended tunnel structure and a construction method. The main cable buried section of the invention is in an arc shape, and the line connecting the midpoint of the arc and the center of the arc passes through the center of gravity of the upper soil body. The main cable is subjected to a radial force exerted by the upper soil body, which offsets part of the main cable tension, effectively reduces the shore anchorage volume, and avoids the complexity and safety problems of underwater concrete anchorage construction; a vibration reduction and damping device is provided at the exit of the main cable channel, and the vibration reduction and damping material therein can prevent the main cable from being fatigued and damaged at the exit; the limit anchor slings on the same plane intersect at one point in pairs, and are provided with an upper and lower layer of anchor slings, the double-layer oblique limit anchor sling increases the mid-span stiffness of the suspended tunnel, and an ear plate is added to the cable clamp to adapt to the angle change of the upper and lower layers of anchor slings at different node positions, and the angle change of the anchor slings at different nodes on the same plane is adapted through an adjustable cable head, so as to facilitate construction.

Description

Technical Field

[0001] The invention relates to the technical field of underwater tunnel transportation, and in particular to a surface anchored anti-tensioned anchor cable system supporting a suspended tunnel structure and a construction method. Background Art

[0002] As a new underwater crossing method, the submerged floating tunnel (SFT, also known as the "Archimedes Bridge") provides a new idea for the construction of deep-water channels. It is generally composed of a floating tunnel, anchor cables anchored to the underwater foundation (or floating boxes on the water), and revetment structures connected to both sides. Compared with traditional bridges and submarine tunnels, floating tunnels have the advantages of large crossing capacity, strong environmental adaptability, and all-weather operation. In addition, due to its small impact on the surrounding environment, less restrictions on meteorological conditions, gentle longitudinal slope, and stable unit cost, it has become the most competitive new transportation structure across rivers, lakes, and seas in the 21st century.

[0003] Existing suspended tunnel structures can be divided into underwater pier-supported suspended tunnels, buoy-supported suspended tunnels and anchor-anchored suspended tunnels according to different support methods. Among them, the anchor-anchored type can be divided into submarine anchored type and shore anchored type. The submarine anchored type usually requires construction personnel to dive into the seabed and locate and install anchor cables on the seabed. The construction is difficult and dangerous, and the stability and safety of the structure will be greatly affected when encountering deep seabeds and large spans. The shore anchored type can avoid the above problems, but the pull-out resistance of its main cable is completely provided by the shore anchor, resulting in a very large volume required for the anchor, and there are many inconveniences in the underwater construction of large-volume anchors. Therefore, it is necessary to propose a new type of surface anchored anti-tensioned anchor cable system to support the suspended tunnel structure, which can cross deeper waters, reduce the volume of anchors and improve the convenience of construction. Summary of the invention

[0004] The purpose of the present invention is to provide a surface anchored anti-tensioned anchor cable system supporting a suspended tunnel structure and a construction method suitable for anchor cable support construction of a suspended tunnel section in waters with good soil stability on both sides of the river, so as to solve the problems of inconvenience in anchoring anchor cables in large-span deep-sea waters and excessively large underwater anchorage volume and inconvenient construction of anti-tensioned anchor cables, while increasing the rigidity and stability of the structure by intersecting anchor cables.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a surface anchorage type anti-tension anchor cable system supporting a suspended tunnel structure. The suspended tunnel structure is applied to a rock foundation and comprises a surface anchorage, a main cable channel, a main cable, a cable clamp, a vibration reduction and damping device and an anchor sling. The surface anchorage is fixed to the surface of both sides of the suspended tunnel, the main cable channel is buried in the rock, the vibration reduction and damping device is arranged at the underwater exit of the main cable channel and is fixed to the retaining wall and the embankment by expansion bolts to prevent fatigue damage to the main cable at the exit; the main cable passes through the main cable channel and the suspended tunnel and is connected to the surface anchorages on both sides, the main cable and the anchor sling are connected by the cable clamp, and the anchor sling is obliquely fixed to the suspended tunnel and the main cable.

[0007] The buoyancy of the closed floating tunnel is greater than its own gravity, and the remaining buoyancy and subsequent operational load of the floating tunnel are balanced by the tension borne by the anchor sling; the anchor main cable provides tension balance for the anchor sling, and when the main cable and the anchor sling are connected, the cable clamp can adapt to the main cable and anchor sling connected at different angles by adjusting the angle of the ear plate and the angle of the adjustable cable head; the main cable passes through the soil layers on both sides and is connected to the surface anchor. The mountains on both sides share part of the pull-out force for the anchor by applying radial force on the main cable, thereby realizing the anti-tension anchor cable system to support the floating tunnel structure.

[0008] The location of the surface anchor needs to be determined through geological survey and calculation so that the shear bearing capacity and slope stability of the soil layers on both sides meet the requirements.

[0009] Furthermore, the area between the surface anchor and the underwater exit of the main cable channel is the buried section of the main cable, and the line shape of the buried section of the main cable is an arc. The line connecting the center of the circle of the buried section of the main cable and the center of the arc section passes through the center of gravity of the upper mountain. The radial force exerted on the main cable by the mountains on both sides is used to offset part of the main cable tension, thereby sharing the pull-out resistance for the surface anchor.

[0010] Furthermore, the main cable channel is constructed using underground positioning and drilling technology, and the excavation diameter of the main cable channel is about 3-5 times the diameter of the main cable.

[0011] The surface anchors are set on the surface, and the two ends of the main cable are fixed in the surface anchors on both sides. The rock foundations on both sides need to be surveyed and calculated in advance to determine their shear strength and slope stability. The anchors are set in areas where the rock foundations have stable supporting force.

[0012] Furthermore, the main cable channel adopts a four-layer "sandwich" layout. The main cable channel is provided with a corrugated pipe and a main cable. Grouting is performed on the outside of the corrugated pipe, and anti-corrosion filler is filled inside the corrugated pipe. The main cable is fixed and shaped under the action of the anti-corrosion filler inside the corrugated pipe. A plurality of pads are also provided at the bottom of the corrugated pipe. Pads are arranged at a certain distance at the bottom and on the left and right sides of the circumference of the corrugated pipe, so that the corrugated pipe is located in the center of the channel.

[0013] Furthermore, the vibration-damping and damping device includes a stainless steel shell and a vibration-damping and damping material. A embankment retaining wall is built around the underwater exit of the main cable channel. The stainless steel shell is turned outward to the embankment and the retaining wall. The vibration-damping and damping device is fixed to the embankment and the retaining wall by expansion bolts. Corrosion-resistant vibration-damping and damping material is filled between the stainless steel shell and the main cable, and waterproof paint is sprayed on the side of the vibration-damping and damping device facing the water area.

[0014] Preferably, the vibration-damping and damping material may be a vibration-damping and damping rubber material.

[0015] Furthermore, the shape of the filled vibration-damping and damping material is a truncated cone.

[0016] Preferably, one end of the anchor sling is connected to the suspension tunnel via a sleeve, and the other end is connected to the main cable via the cable clamp.

[0017] Furthermore, the anchor sling is obliquely fixed on the floating tunnel and the main cable, and the planes on which the anchor sling, the floating tunnel and the main cable are fixed include an upper fixed plane and a lower fixed plane, and the anchor slings on any fixed plane of the upper fixed plane and the lower fixed plane intersect and are anchored at the node of the same anchor sling, and the lower end cable heads of the inclined plane formed by the two obliquely placed anchor slings are anchored at the same node of the main cable.

[0018] Preferably, except for the first and last nodes, each node of the main cable is connected to four anchor cables through a cable clamp. In the cross section, the extension line of the main cable is located between the anchor cables on the upper fixed plane and the anchor cables on the lower fixed plane, and is biased towards the anchor cables with greater force; when the internal forces of the two anchor cables are equal, the extension line of the main cable is the bisector of the angle between the two anchor cables.

[0019] The main cable and anchor sling are connected by a cable clamp. The angle design of the anchor sling and the anti-slip coefficient K of the cable clamp fc and anti-sliding friction F fc related,

[0020] Among them, the cable clamp anti-slip coefficient K fc for:

[0021]

[0022] Among them, N c is the downward force of the cable clamp on the main cable,

[0023] N h is the anchor cable tension, calculated according to the standard value of action;

[0024] It is the installation inclination angle of the cable clamp on the main cable, calculated according to the maximum value among similar cable clamps;

[0025] Anti-sliding friction F fc for:

[0026] F fc = kμP tot ;

[0027] Where k is the coefficient of uneven distribution of tightening pressure, which is taken as 2.8;

[0028] μ is the friction coefficient, which is taken as 0.15;

[0029] P tot is the total design clamping force of the cable clamp screw,

[0030] n cb is the total number of screws installed on the cable clamp;

[0031] It is the designed clamping force of a single screw on the cable clamp.

[0032] Furthermore, the cable clamp includes a cover plate, an ear plate and an adjustable cable head, the ear plate is connected to the cover plate through a first pin shaft, an adjustable ear plate is provided on the ear plate, the adjustable cable head is connected to the adjustable ear plate, the adjustable cable head is adjusted in angle through a second pin shaft, the angle between the upper and lower layers of anchor slings is changed by adjusting the first pin shaft, and is used to adapt to the change in the angle between the upper and lower layers of anchor slings at different node positions, and the angle between the two anchor slings on the same plane is changed by adjusting the second pin shaft, and is adapted to the change in the angle between the anchor slings at different nodes on the same plane. During construction, a pre-tightening force is applied to the pin shaft, and the pin shaft is tightened after the anchor slings are subjected to tension to generate rigidity, that is, the angle between each anchor sling is determined; the surface of the cable clamp and the high-strength bolt can be added with underwater anti-corrosion technology as needed, such as spraying polyurea anti-corrosion coating.

[0033] The present invention also provides a construction method for supporting a suspended tunnel structure with a surface anchored anti-tensioned anchor cable system, the construction method comprising:

[0034] (1) Arrange waterproof construction space;

[0035] The main cable channel exit is determined by underwater positioning technology, and a floating vessel is used to sink a sinking barrel section of a certain diameter to the main cable channel exit and embed its bottom into the embankment; then, other sinking barrel sections are spliced ​​on top of the first sinking barrel section in sequence, and after the sinking barrel is above the water surface, the seawater inside the barrel is pumped out of the barrel, and the joints of the two sinking barrels are welded;

[0036] (2) Excavate the main cable channel and cast the retaining wall at the main cable channel entrance;

[0037] The main cable channel is excavated using underground positioning and drilling technology. After excavation, the silt around the main cable channel opening is removed, and the retaining wall is cast. The retaining wall is fixed to the embankment using expansion bolts. A circular hole with the midpoint of the main cable as the center and a radius of 1.5 times the main cable diameter is reserved on the retaining wall.

[0038] (3) Install the stainless steel housing and bellows of the vibration damping device;

[0039] The stainless steel shell is fixed to the retaining wall and the embankment with expansion bolts; the underwater exit support template of the main cable channel extends into the corrugated pipe from the surface hole. Before the corrugated pipe extends into the main cable channel, equal-sized pads are arranged at the bottom and left and right sides of the corrugated pipe at intervals to ensure that the corrugated pipe can be in the center of the channel when entering the channel. After the corrugated pipe is arranged, its lower end should be in contact with the inner surface of the support template, and the upper end of the corrugated pipe should be fixed;

[0040] (4) Pour grouting material into the outer tube and arrange the main cable;

[0041] The grouting material outside the pipe is poured in from the surface hole. After it solidifies, the support template is removed and the main cable is arranged. The main cable is passed through the main cable channel by the traction robot. After the main cable passes through the underwater exit of the main cable channel, the watertight bucket opening and closing door is opened to pull the main cable into the sea. At this time, the underwater construction personnel control the traction direction of the traction robot. After reaching the opposite bank, the watertight bucket opening and closing door is opened to pull the main cable to the surface anchorage on the opposite bank. When the opening and closing door is opened, the seawater entering the working area is pumped out by the water pump;

[0042] (5) Tensioning the main cable;

[0043] According to the design, the length of the main cable in the water section is reserved, and the main cable is tensioned at both ends of the main cable channel by using jacks to make it close to the upper wall of the corrugated tube and shape it, and the cable heads of the main cables on both sides are fixed in the surface anchorage;

[0044] (6) Install anchor slings;

[0045] Fix the anchor sling with the cable clamp, then adjust the cable clamp, and construct symmetrically on both sides of the tunnel at the same time until the suspended tunnel is closed, the anchor sling is installed, and the jack is removed;

[0046] (7) Adjust the length of the main cable and pour filler into the pipe;

[0047] Filling material is poured into the corrugated pipe at the surface hole. After filling, the vibration damping material is filled into the stainless steel shell of the vibration damping device, and waterproof coating is sprayed on the surface of the device. The construction of the buried section of the main cable is completed.

[0048] Install the cable clamp at the design point of the main cable clamp. The two cover plates of the cable clamp are roughly closed at 45°. Tighten the two rows of high-strength bolts of the cover plate, and then tighten the high-strength bolts of the ear plate cover plate. When fixing the adjustable cable head and the ear plate, apply pre-tightening force to the first pin and the second pin, and do not tighten them completely, that is, control the displacement of the pin but not the rotation angle. When a section of the suspended tunnel is installed, install the anchor sling. The anchor sling is affected by the buoyancy of the section and generates tension. The angle between the anchor slings in the upper and lower planes and the angle between the two anchor slings on the same plane are determined. Tighten the first pin and the second pin, and construct symmetrically on both sides of the tunnel at the same time until the suspended tunnel is closed and the anchor sling is installed.

[0049] Furthermore, the lower edge of the first sink barrel is provided with an inclination angle, the inclination angle reserves space for the main cable channel, and an opening and closing door is reserved on the barrel wall corresponding to the channel opening of the main cable channel to facilitate the passage of the main cable.

[0050] The present invention has the following beneficial effects:

[0051] (1) The buried section of the main cable of the present invention is in the shape of an arc, and the line connecting the midpoint of the arc and the center of the arc passes through the center of gravity of the upper soil. The main cable is subjected to radial force exerted by the upper soil, which offsets part of the tension of the main cable, effectively reducing the volume of the surface anchorage and avoiding the complexity and safety issues of underwater concrete anchorage construction.

[0052] (2) A vibration reduction and damping device is provided at the outlet of the main cable channel of the present invention, wherein the vibration reduction and damping material can prevent fatigue damage to the main cable at the outlet.

[0053] (3) In the present invention, the limit anchor cables on the same plane intersect at one point, and are provided with an upper and lower layer of anchor cables. The double-layer oblique limit anchor cables increase the mid-span stiffness of the suspended tunnel, and ear plates are added to the cable clamps to adapt to the angle changes of the upper and lower layers of anchor cables at different node positions. The adjustable cable head can adapt to the angle changes of the anchor cables at different nodes on the same plane, which is convenient for construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural elevation view of the suspended tunnel of the present invention.

[0055] Figure 2 yes Figure 1 Cross-sectional view of the suspended tunnel structure in the middle A direction.

[0056] Figure 3 It is a plan view of the suspension tunnel structure of the present invention.

[0057] Figure 4 It is a side view of the underwater outlet of the main cable of the present invention.

[0058] Figure 5 It is a front view of the underwater outlet of the main cable of the present invention.

[0059] Figure 6 It is a side view of a cable clamp of the present invention.

[0060] Figure 7 It is a front view of a cable clamp of the present invention.

[0061] Figure 8 It is a construction flow chart of the present invention. DETAILED DESCRIPTION

[0062] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be pointed out that the embodiments are only specific explanations of the invention and should not be regarded as limitations of the invention. The purpose of the embodiments is to enable those skilled in the art to better understand and reproduce the technical solutions of the present invention. The protection scope of the present invention shall still be based on the scope defined by the claims.

[0063] like Figure 1-4 As shown, the present invention provides a surface anchor type anti-tension anchor cable system to support a suspended tunnel structure, the suspended tunnel structure is applied to a rock foundation, and includes a surface anchor 2, a main cable channel 3, a main cable 4, a cable clamp 5, a vibration reduction and damping device 7 and an anchor sling 8. The surface anchor 2 is fixed to the surface of both sides of the suspended tunnel 1, the main cable channel 3 is buried in the rock, the vibration reduction and damping device 7 is arranged at the underwater exit of the main cable channel 3, and is fixed to the retaining wall and the embankment by expansion bolts 10 to prevent fatigue damage to the main cable 4 at the exit; the main cable 4 passes through the main cable channel 3, the suspended tunnel 1 and the surface anchor 2 on both sides, and the anchor sling 8 is obliquely fixed to the suspended tunnel 1 and the main cable 4.

[0064] The buoyancy of the closed floating tunnel is greater than its own gravity, and the remaining buoyancy of the floating tunnel 1 and the subsequent operational load are balanced by the tension borne by the anchor cable 8; the main cable 4 provides tension balance for the anchor cable 8, and when the main cable 4 and the anchor cable 8 are connected, the cable clamp 5 can adapt to the main cable 4 and the anchor cable 8 connected at different angles by adjusting the angle of the ear plate 51 and the angle of the adjustable cable head 53; the main cable 4 passes through the soil layers on both sides and is connected to the surface anchor 2, and the mountains on both sides share part of the pull-out force for the anchor by applying radial force on the main cable 4, so as to realize the anti-tension anchor cable system to support the floating tunnel structure.

[0065] The location of the surface anchor needs to be determined through geological survey and calculation so that the shear bearing capacity and slope stability of the soil layers on both sides meet the requirements.

[0066] In some preferred schemes, the area between the surface anchor 2 and the underwater exit of the main cable channel is the main cable buried section 6, and the line shape of the main cable buried section 6 is an arc shape. The line connecting the center of the circle of the main cable buried section 6 and the center of the arc section passes through the center of gravity of the upper mountain. The radial force exerted on the main cable by the mountains on both sides is used to offset part of the main cable tension, thereby sharing the pull-out resistance for the surface anchor.

[0067] In some preferred solutions, the main cable channel is constructed using underground positioning and drilling technology, and the excavation diameter of the main cable channel is about 3-5 times the diameter of the main cable.

[0068] The surface anchor 2 is set on the surface, and the two ends of the main cable 4 are fixed in the surface anchors 2 on both sides respectively. The rock foundation on both sides needs to be surveyed and calculated in advance to determine its shear strength and slope stability. The anchor is set in an area where the rock foundation has a stable supporting force.

[0069] In some preferred schemes, the main cable channel 3 adopts a four-layer "sandwich" layout, and the main cable channel is provided with a corrugated tube 32 and a main cable 4. Grouting 31 is injected outside the corrugated tube 32, and anti-corrosion filler 30 is filled inside the corrugated tube. Under the action of the anti-corrosion filler inside the corrugated tube, the main cable 4 is fixed and shaped. A plurality of pads 34 are also provided at the bottom of the corrugated tube 32. Pads 34 are arranged at the bottom and left and right sides of the circumference of the corrugated tube 32 at intervals, so that the corrugated tube 32 is located at the center of the main cable channel 3.

[0070] In some preferred schemes, the vibration-damping and damping device 7 includes a stainless steel shell 71 and a vibration-damping and damping material 72. A embankment retaining wall 12 is built around the underwater exit of the main cable channel 3. The stainless steel shell 71 is turned outward to the embankment and the retaining wall. The vibration-damping and damping device 7 is fixed to the embankment and the retaining wall by expansion bolts 10. The stainless steel shell 71 and the main cable 4 are filled with corrosion-resistant vibration-damping and damping material 72, and a waterproof coating 73 is sprayed on the side of the vibration-damping and damping device 7 facing the water area.

[0071] Preferably, the vibration-damping and damping material 72 can be made of vibration-damping and damping rubber material.

[0072] In some preferred embodiments, the filled vibration-damping material 72 is in the shape of a truncated cone.

[0073] Preferably, one end of the anchor cable 8 is connected to the floating tunnel 1 through a sleeve, and the other end is connected to the main cable 4 through the cable clamp 5 .

[0074] In some preferred schemes, the anchor sling 8 is obliquely fixed on the floating tunnel 1 and the main cable 4, and the planes on which the anchor sling 8, the floating tunnel 1 and the main cable 4 are fixed include an upper fixed plane and a lower fixed plane, and the anchor slings in any fixed plane of the upper fixed plane and the lower fixed plane intersect and are anchored at the nodes of the same anchor sling 8 in pairs, and the lower end cable heads of the inclined plane formed by the two obliquely placed anchor slings 8 are anchored at the same node of the main cable 4.

[0075] Preferably, the anchor sling located on the upper fixing plane is an upper anchor sling, and the anchor sling located on the lower fixing plane is a lower anchor sling.

[0076] Preferably, except for the first and last nodes, each node is connected to four anchor cables 8 through a cable clamp 5. In the cross section, the extension line of the main cable 4 is located between the upper anchor cable 81 and the lower anchor cable 82, and is biased towards the anchor cable 8 with greater force; when the internal forces of the two anchor cables 8 are equal, the extension line of the main cable 4 is the bisector of the angle between the two anchor cables 8.

[0077] The main cable 4 and the anchor sling 8 are connected by a cable clamp 5. The angle design of the anchor sling 8 and the anti-slip coefficient K of the cable clamp 5 are fc and anti-sliding friction F fc related;

[0078] Among them, the cable clamp anti-slip coefficient K fc for:

[0079]

[0080] Among them, N c is the downward force of the cable clamp on the main cable,

[0081] N h is the anchor cable tension, calculated according to the standard value of action;

[0082] It is the installation inclination angle of the cable clamp on the main cable, calculated according to the maximum value among similar cable clamps;

[0083] Anti-sliding friction F fc for:

[0084] F fc = kμP tot ;

[0085] Where k is the coefficient of uneven distribution of tightening pressure, which is taken as 2.8;

[0086] μ is the friction coefficient, which is taken as 0.15;

[0087] P tot is the total design clamping force of the cable clamp screw,

[0088] n cb is the total number of screws installed on the cable clamp;

[0089] It is the designed clamping force of a single screw on the cable clamp.

[0090] In some preferred schemes, the cable clamp 5 includes a cover plate 51, an ear plate 52 and an adjustable cable head 53, the ear plate 52 is connected to the cover plate 51 through a first pin shaft 54, an adjustable ear plate 55 is provided on the ear plate 52, and the adjustable cable head 53 is connected to the adjustable ear plate 55, the angle of the adjustable cable head 53 is adjusted through the second pin shaft, and the angle between the upper and lower layers of anchor cables 8 is changed by adjusting the first pin shaft 56 to adapt to the angle change of the upper and lower layers of anchor cables 8 at different node positions, and the angle between the two anchor cables 8 in the same plane is changed by adjusting the second pin shaft 56 to adapt to the angle change of the anchor cables 8 at different nodes on the same plane, wherein the angle between the two oblique limiting anchor cables in the same plane is α, the angle of the upper anchor cable is set to β2, and the angle of the upper anchor cable is set to β1; the angle of the main cable 4 is set to γ. During the construction, a pre-tightening force is applied to the pin shaft, and the pin shaft is tightened after the anchor sling 8 is subjected to tension and generates rigidity, that is, the angle between the anchor slings 8 is determined; the surface of the cable clamp 5 and the high-strength bolt can be added with underwater anti-corrosion technology as needed, such as spraying polyurea anti-corrosion coating.

[0091] like Figure 8 As shown, the present invention also provides a construction method for supporting a suspended tunnel structure with a surface anchored anti-tensioned anchor cable system, the construction method comprising:

[0092] S1, arrange water-proof construction space;

[0093] The main cable channel exit is determined by underwater positioning technology, and a floating vessel is used to sink a sinking barrel section 11 of a certain diameter to the main cable channel exit and embed its bottom into the embankment; then, other sinking barrel sections are sequentially spliced ​​above the first sinking barrel section, and after the sinking barrel is above the water surface, the seawater inside the sinking barrel is pumped out of the barrel, and the splicing of the two sinking barrels is welded;

[0094] S2, excavate the main cable channel and cast the retaining wall at the main cable channel entrance;

[0095] The main cable channel 3 is excavated by using underground positioning and drilling technology. After excavation, the silt around the main cable channel opening is removed, and a retaining wall is cast. The retaining wall is fixed to the embankment using expansion bolts 10. A circular hole with a center of the main cable 4 and a radius of 1.5 times the diameter of the main cable 4 is reserved on the retaining wall;

[0096] S3, installing the stainless steel housing 71 and the bellows 32 of the vibration damping device 7;

[0097] The stainless steel shell 71 is fixed to the retaining wall and the embankment with expansion bolts 10; the template for supporting the underwater exit of the main cable channel is extended into the corrugated pipe 32 from the surface hole, and the bellows 32 is extended into the main cable channel 3. Before the bellows 32 is extended into the main cable channel 3, equal-sized cushion blocks 34 are arranged at a certain distance at the bottom and left and right sides of the bellows 32 to ensure that the bellows 32 can be in the center of the channel when entering the channel. After the bellows 32 is arranged, its lower end should be in contact with the inner surface of the support template, and the upper end of the bellows 32 is fixed;

[0098] S4, pour grouting material into the outer tube and arrange the main cable 4;

[0099] The grouting material outside the pipe is poured in from the surface hole, and after it solidifies, the support template is removed and the main cable 4 is arranged; the main cable 4 is passed through the main cable channel 3 by the traction robot, and the watertight bucket opening and closing door is opened after the main cable 4 passes through the underwater exit hole of the main cable channel, and the main cable is towed to the sea area. At this time, the underwater construction personnel control the traction direction of the traction robot, open the watertight bucket opening and closing door after reaching the opposite bank, and tow the main cable 4 to the surface anchor 2 on the opposite bank. When the opening and closing door is opened, the seawater entering the working area is pumped out by the water pump;

[0100] S5, tensioning main cable 4;

[0101] According to the design, the length of the main cable 4 in the water section is reserved, and the main cable is tensioned at both ends of the main cable channel 3 by using a jack to make it close to the upper wall of the corrugated tube 32 and be shaped, and the cable heads of the main cables on both sides are fixed in the surface anchorage;

[0102] S6, installing the anchor sling 8; fixing the anchor sling 8 by the cable clamp 5, then adjusting the cable clamp 5, and symmetrically constructing both sides of the tunnel at the same time until the suspended tunnel is closed, the anchor sling 8 is installed, and the jack is removed;

[0103] S7, adjusting the length of the main cable 4 and pouring filler into the tube;

[0104] Filling material is poured into the corrugated pipe at the surface hole. After filling, the stainless steel shell of the vibration reduction and damping device 7 is filled with vibration reduction and damping material, and waterproof coating is sprayed on the surface of the device. The construction of the main cable buried section is completed.

[0105] The cable clamp is installed at the design point of the cable clamp 5 of the main cable. The two cover plates 51 of the cable clamp 5 are closed at approximately 45 degrees. Tighten the two rows of cover plate high-strength bolts 50, and then tighten the ear plate cover plate high-strength bolts 50; when fixing the adjustable cable head 53 and the ear plate 52, apply pre-tightening force to the first pin 54 and the second pin 56, and do not tighten them completely, that is, control the displacement of the pins but not the rotation angle; when a section of the suspended tunnel is installed, install the anchor cable 8, and the anchor cable is affected by the buoyancy of the section to generate tension. The angle between the anchor cables 8 in the upper and lower planes and the angle between the two anchor cables 8 on the same plane are determined, tighten the first pin 54 and the second pin 56, and construct symmetrically on both sides of the tunnel at the same time until the suspended tunnel is closed and the anchor cable 8 is installed.

[0106] In some preferred embodiments, the lower edge of the first sinker is provided with an inclination angle, the inclination angle reserves space for the main cable channel 3, and an opening and closing door is reserved on the barrel wall corresponding to the channel opening of the main cable channel 3 to facilitate the passage of the main cable.

[0107] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

Claims

1. A surface anchored anti-tension anchor cable system supporting a suspended tunnel structure, wherein the suspended tunnel structure is applied to a rock foundation, and is characterized in that: It includes a surface anchor, a main cable channel, a main cable, a cable clamp, a vibration reduction and damping device, and an anchor sling. The surface anchor is fixed to the surface of both sides of the suspended tunnel. The main cable channel is buried in rocks. The vibration reduction and damping device is arranged at the underwater exit of the main cable channel. The main cable passes through the main cable channel and the suspended tunnel and is connected to the surface anchors on both sides. The main cable and the anchor sling are connected by the cable clamp. The anchor sling is obliquely fixed to the suspended tunnel and the main cable. The planes on which the anchor cables, the suspended tunnel and the main cable are fixed include an upper fixed plane and a lower fixed plane. The anchor cables on any of the upper fixed plane and the lower fixed plane intersect and are anchored at the node of the same anchor cable. The lower end cable heads of the inclined plane formed by the two inclined anchor cables are anchored at the same node of the main cable. The cable clamp comprises a cover plate, an ear plate and an adjustable cable head, wherein the ear plate is connected to the cover plate via a first pin shaft, an adjustable ear plate is provided on the ear plate, the adjustable cable head is connected to the adjustable ear plate, and the angle of the adjustable cable head is adjusted via a second pin shaft, and the angle between the upper and lower layers of anchor slings is changed by adjusting the first pin shaft to adapt to the change of the angle between the upper and lower layers of anchor slings at different node positions, and the angle between the two anchor slings on the same plane is changed by adjusting the second pin shaft to adapt to the change of the angle between the anchor slings at different nodes on the same plane; The area between the surface anchor and the underwater exit of the main cable channel is the buried section of the main cable, the line shape of the buried section of the main cable is an arc shape, and the line connecting the center of the circle of the buried section of the main cable and the center of the arc section passes through the center of gravity of the upper mountain; The vibration-damping and damping device comprises a stainless steel shell and a vibration-damping and damping material. A embankment retaining wall is built around the underwater exit of the main cable channel. The stainless steel shell is turned outward to the embankment and the retaining wall. The vibration-damping and damping device is fixed to the embankment and the retaining wall by expansion bolts. Corrosion-resistant vibration-damping and damping material is filled between the stainless steel shell and the main cable, and waterproof paint is sprayed on the side of the vibration-damping and damping device facing the water area.

2. The surface anchored anti-tension anchor cable system supporting the suspended tunnel structure according to claim 1 is characterized in that: The excavation diameter of the main cable channel is 3-5 times the diameter of the main cable.

3. The surface anchored anti-tension anchor cable system supporting the suspended tunnel structure according to claim 1 is characterized in that: The main cable channel is provided with a corrugated pipe and a main cable. Grouting is performed outside the corrugated pipe and anti-corrosion filler is filled inside the corrugated pipe. The main cable is fixed and shaped under the action of the anti-corrosion filler inside the corrugated pipe. A cushion block is also provided at the bottom of the corrugated pipe.

4. The surface anchored anti-tension anchor cable system supporting the suspended tunnel structure according to claim 1 is characterized in that: The vibration-damping material is in the shape of a truncated cone.

5. A construction method for supporting a suspended tunnel structure with a surface anchored anti-tensioned anchor cable system, characterized in that: The construction method is applied to the surface anchored anti-tension anchor cable system supporting the suspended tunnel structure as described in any one of claims 1 to 4, and the construction method comprises: (1) Arrange waterproof construction space; Use underwater positioning technology to determine the underwater exit of the main cable channel, use a floating ship to sink the sinking barrel section to the exit of the main cable channel and embed its bottom into the embankment, and then splice other sinking barrel sections on top of the first sinking barrel section in sequence; (2) Excavate the main cable channel and cast the retaining wall at the main cable channel entrance; Use underground positioning and drilling technology to excavate the main cable channel. After excavation, remove the silt around the main cable channel opening, cast the retaining wall, and use expansion bolts to fix the retaining wall to the embankment; (3) Install the stainless steel housing and bellows of the vibration damping device; The stainless steel shell is fixed to the retaining wall and the embankment with expansion bolts; the grouting template is supported at the underwater outlet of the main cable channel and extends into the corrugated pipe from the surface hole; (4) Pour grouting material outside the pipe and arrange the main cable; The grouting material outside the pipe is poured in from the surface hole. After it solidifies, the support formwork is removed and the main cable is arranged. (5) Tensioning the main cable; According to the design, the length of the main cable in the water section is reserved, and the main cable is tensioned at both ends of the main cable channel by using jacks to make it close to the upper wall of the corrugated tube and shape it, and the cable heads of the main cables on both sides are fixed in the surface anchorage; (6) Install anchor slings; Fix the anchor sling with the cable clamp, then adjust the cable clamp, and construct symmetrically on both sides of the tunnel at the same time until the suspended tunnel is closed, the anchor sling is installed, and the jack is removed; (7) Adjust the length of the main cable and pour filler into the pipe; Filling material is poured into the corrugated pipe at the surface hole. After filling, the vibration damping material is filled into the stainless steel shell of the vibration damping device, and waterproof coating is sprayed on the surface of the device. The construction of the buried section of the main cable is completed.

6. The construction method of supporting a suspended tunnel structure with a surface anchored anti-tensioned anchor cable system according to claim 5, characterized in that: The lower edge of the first sink barrel is provided with an inclination angle, and the inclination angle reserves space for the main cable channel, and an opening and closing door is reserved on the barrel wall corresponding to the main cable channel opening.

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