US-12624515-B2 - Floating tunnel shore connecting system, floating tunnel, and floating tunnel construction method thereof

US12624515B2US 12624515 B2US12624515 B2US 12624515B2US-12624515-B2

Abstract

A floating tunnel shore connecting system, a floating tunnel and a floating tunnel construction method are disclosed, where the design method of the floating tunnel is to apply axial tension along one end or two ends of a tube body respectively; The floating tunnel shore connecting system comprises a joint section located at the end of the tube body, which can move along the axial direction and is connected with a tension device for applying axial tension; The floating tunnel comprises a tube body and a hollow cavity, wherein the tube body comprises a floating section and a shore connecting system at two ends, and both joint sections are provided with tension devices. The design method and structure of the floating tunnel provided by the present invention, by applying the axial tension of the tube body, can significantly increase the horizontal stiffness and vertical stiffness of the whole floating tunnel tube body, improving the natural vibration frequency of the tube body, and the safety and reliability of the floating tunnel are improved; It is beneficial to the long-term use of the cable and the foundation anchored on the seabed or the riverbed. The construction risk is also lower, and the cost is also lower, which effectively saves the construction cost, and is easy to implement and popularize the project.

Inventors

Wei Lin
Yinghui TIAN
Haiqing Yin

Assignees

CHINA COMMUNICATIONS CONSTRUCTION COMPANY LIMITED

Dates

Publication Date: 20260512
Application Date: 20220519
Priority Date: 20191119

Claims (20)

1 . A floating tunnel shore connecting system, characterized in that it includes a joint section located at an end of a floating tunnel, which can move axially along a tube body; the joint section is provided with a tension device, which is used to apply axial tension to the joint section; wherein the tube body is an integral structural member in a linear shape; the tension device is connected to the joint section, and another end is connected to a shore foundation or a fixed structure; the floating tunnel can be adopted to apply several oblique forces at each end, and a resultant force of all the oblique forces along an axial component of the floating tunnel is an axial tensile force applied to the end of the floating tunnel; stress points corresponding to each oblique force applied to each end of the floating tunnel tube body are respectively arranged at different positions along a surface length direction of the tube body; and a size of the axial tension can be adjusted, so that adjustment of the axial tension can adjust a natural vibration frequency of the tube body; the tension device comprises a plurality of cables arranged on a periphery, one end of all the cables is arranged along the periphery of the floating tunnel joint section, and another end is anchored on the shore foundation or the fixed structure; each cable of the tension device is provided with a tension adjusting mechanism; the tension adjusting mechanism on each of the cables includes an anchor chamber at the end of the cable, and the anchor chamber is provided with an adjuster which can adjust a tension of a corresponding one of the cables, and when the anchor chamber is a shore anchor chamber, the shore anchor chamber is arranged on the shore foundation; and by adjusting the tension of each cable to adjust the axial tension applied to joint section, the natural vibration frequency of the tube body of the floating tunnel is adjusted.
2 . A floating tunnel shore connecting system according to claim 1 , characterized in that the joint section passes through the shore foundation and can move axially relative to the shore foundation.
3 . A floating tunnel shore connecting system according to claim 2 , characterized in that all the cables are arranged along the surface length direction of the joint section of the floating tunnel; and all the cables arranged along a same section of the joint section of the floating tunnel have a same included angle with an axis of the floating tunnel and are symmetrically arranged.
4 . A floating tunnel shore connecting system according to claim 1 , characterized in that all the cables are all obliquely connected to the joint section of the floating tunnel, and the included angle α between each cable and the axis of the floating tunnel is less than 30°.
5 . A floating tunnel shore connecting system according to claim 1 , characterized in that each joint section is provided with several mooring lugs for connecting the cables.
6 . A floating tunnel shore connecting system according to claim 1 , characterized in that the end of the cable is anchored in a precast concrete block located in the shore foundation or in a steel structure located on the shore ground.
7 . A floating tunnel shore connecting system according to claim 5 , characterized in that each of the joint sections comprises an annular steel plate layer and a hollow cavity arranged in the annular steel plate layer, and all the mooring lugs are connected to the steel plate layer.
8 . The floating tunnel shore connecting system according to claim 7 , characterized in that the steel plate layer is internally provided with a ring-shaped reinforced concrete layer; the reinforced concrete layer is internally provided with a plurality of shear members with one end connected to the steel plate layer; and a ring-shaped rubber layer is further arranged between the steel plate layer and the reinforced concrete layer.
9 . The floating tunnel shore connecting system according to claim 8 , characterized in that a circumferential water-stop member is further arranged between each joint section and the shore foundation, and the circumferential water-stop member is sleeved on the joint section; and the circumferential water-stop member is an elastic structure.
10 . A floating tunnel, comprising a tube body, wherein the tube body has a hollow cavity, and the tube body comprises a floating section, and both ends of the floating section are respectively connected with the shore connecting system according to claim 1 .
11 . A floating tunnel according to claim 10 , characterized in that the axial tension applied by two tension devices on two shore connecting systems has a same size and opposite directions.
12 . A floating tunnel according to claim 10 , characterized in that the floating section and two joint sections each include a steel plate layer and a reinforced concrete layer located in the steel plate layer, all the steel plate layers are integral structural members, and all the reinforced concrete layers are integral structural members; a cross-sectional shape of the tube body is circular, square, elliptical or horseshoe-shaped; and the floating section comprises several tube units spliced together.
13 . A floating tunnel according to claim 12 , characterized in that a length of the tube body between two shore foundations is 50-3000 m.
14 . A floating tunnel according to claim 13 , characterized in that the length of the tube body between the two shore foundations is 200-2000 m.
15 . A floating tunnel according to claim 12 , characterized in that the floating section is provided with an anchoring device which can be anchored on a riverbed or a seabed, or the floating section is connected with a pontoon device which can float on a water surface.
16 . A floating tunnel, comprising the shore connecting system as claimed in claim 1 and the tube body, wherein the tube body has a hollow cavity and includes a floating section, one end of which is connected to the shore connecting system and another end of which is connected to a pull-stop section fixed on the shore foundation.
17 . A floating tunnel according to claim 16 , characterized in that the pull-stop section includes a radial protrusion arranged at the other end of the floating section, the shore foundation is provided with a groove portion matched with the protrusion, and the protrusion is a structural member integrally formed with the floating section.
18 . A floating tunnel according to claim 16 , characterized in that the pull-stop section is a gravity caisson structure connected to the other end of the floating section; and the gravity caisson structure is a steel or reinforced concrete caisson structure.
19 . A floating tunnel according to claim 16 , characterized in that the pull-stop section is an anti-pull anchor connected to the other end of the floating section, and the anti-pull anchor is anchored on the shore foundation.
20 . A floating tunnel according to claim 16 , characterized in that the floating section and the joint sections each comprise a steel plate layer and a reinforced concrete layer in the steel plate layer, all the steel plate layers are integral structural members, and all the reinforced concrete layers are integral structural members; a cross-sectional shape of the tube body is circular, square, elliptical or horseshoe-shaped; and the floating section is formed by splicing several tube units.

Description

RELATED APPLICATIONS The present application is a continuation of International Appl. No. PCT/CN2020/129975, filed Nov. 19, 2020, pending, which claims priority to Chinese Pat. Appl. No. 201911135735.4, filed Nov. 19, 2019, both of which are incorporated herein by reference in their entireties. FIELD OF THE INVENTION The present invention relates to the technical field of floating tunnel engineering, particularly a floating tunnel shore connecting system, a floating tunnel thereof, and a floating tunnel construction method. BACKGROUND TECHNICAL As a new type of traffic mode across the water area, the floating tunnel in water generally through the combined action of the self-weight and buoyancy of the structure and the anchoring system set on the underwater foundation to maintain the balance and stability of the floating tunnel in water. Because of the complex structure and working environment of the floating tunnel, there is no successful precedent in the world at present, and the technology of the floating tunnel is still in the technical conception and experimental stage. The technical conception of the existing floating tunnel structure is generally divided into anchor pull type and buoy type. Among them, the structural buoyancy of the anchor-pull floating tunnel tube body is greater than gravity, and the upward floating tube body is anchored on the seabed or river bed through cables; The gravity of the floating tunnel tube is greater than the buoyancy; the sinking tube is “anchored” on the water through the floating pontoon. The cables of the anchor-pull floating tunnel are arranged vertically and obliquely, and the vertical cables only provide vertical restraint to the tube body. The vertical cables provide both vertical and horizontal constraints to the tube body, that is, the stiffness contribution to the floating tunnel structural system includes vertical stiffness contribution and horizontal stiffness contribution. Since the connection between the pontoon and the tube body of the pontoon-type floating tunnel is rigid, the stiffness contribution of the pontoon-type floating tunnel to the structural system of the floating tunnel through the change of its own water buoyancy is only the vertical stiffness contribution. In addition, the existing technical conception, no matter whether it is anchor-pull floating tunnel or pontoon-type floating tunnel, the two ends of the tube body of two floating tunnels are connected with the shore (that is, the joint of the shore connecting) and both include fixed connection and hinged connection. The way of connecting the shore connecting can restrict the translation and rotation of the end of the tube body by means of fixed connection, and the way of connecting the shore connecting only restricts the translation of the end of the tube body by means of hinged connection. Both types of shore connecting provide the horizontal and vertical stiffness contributions of the floating tunnel structure mainly through the flexural resistance of the tube section. That is to say, it can be predicted that the larger the cross-sectional area of the floating tunnel tube body, the greater the flexural modulus of the tube body section, and the greater the horizontal and vertical stiffness of the floating tunnel structural system. The inventor found that pontoon type floating tunnel and anchor-pull type floating tunnel exist following technical problem in carrying out this project research: For the pontoon-type floating tunnel, the pontoon can only provide vertical restraint through the change of hydrostatic buoyancy, but cannot provide the horizontal restraint, i.e., cannot contribute to the horizontal stiffness of the floating tunnel structure system, therefore, the contribution of the pontoon-type floating tunnel horizontal stiffness all comes from the constraints of shore connecting and bending modulus of tube body sections. When the floating tunnel spans a long water area, no matter how large the cross-section of the tube body is, compared to the length of the floating section of the tube body, the overall tube body is a “slender rod” structure, and the horizontal stiffness of the tube body is still relatively high. Therefore, the deflection of the floating tunnel structure is too large under external waves, water currents and other loads, which affects the safety of the structure, and causes the acceleration of the tunnel operation period to be too large (usually should not exceed 0.3-0.5 m/s2), thus affecting the driving safety and passenger comfort. For the anchor-pull floating tunnel, the existing problems are: 1. As the water depth increases, the anchor cable anchored on the seabed or the riverbed becomes longer and longer, and the restraint effect on the floating tunnel structure system becomes weaker and weaker, and the contribution to the horizontal stiffness of the structural system will also become less and less, and there are also the same problems as the above-mentioned