CN111254979A - Cable anchor system of underwater cable-stayed suspension tunnel - Google Patents
Cable anchor system of underwater cable-stayed suspension tunnel Download PDFInfo
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- CN111254979A CN111254979A CN202010063372.4A CN202010063372A CN111254979A CN 111254979 A CN111254979 A CN 111254979A CN 202010063372 A CN202010063372 A CN 202010063372A CN 111254979 A CN111254979 A CN 111254979A
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- 239000000725 suspension Substances 0.000 title claims abstract description 77
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000007667 floating Methods 0.000 claims description 11
- 230000002457 bidirectional effect Effects 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 8
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 239000002344 surface layer Substances 0.000 claims description 4
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 3
- 239000007900 aqueous suspension Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 22
- 238000004873 anchoring Methods 0.000 description 9
- 210000001503 joint Anatomy 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/063—Tunnels submerged into, or built in, open water
- E02D29/067—Floating tunnels; Submerged bridge-like tunnels, i.e. tunnels supported by piers or the like above the water-bed
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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Abstract
The invention discloses a cable anchor system of an underwater cable-stayed suspension tunnel, which comprises four cable receiving wells, four groups of cable steering piers, a cable ramp and a plurality of stay cables. The four inhaul cable receiving wells are respectively arranged on the sea shore side on the other shore side and the sea shore side opposite to the shore side on the two sides of the tunnel; each cable receiving well comprises a cable anchorage pier and a monitoring room; the four groups of cable steering piers are respectively arranged on the bank slope of the coast side coast and the bank slope of the opposite coast side coast on two sides of the tunnel and are close to the four cable receiving wells in a one-to-one correspondence manner; the stay cable ramp is arranged on the bank slope between each group of stay cable steering piers and the corresponding stay cable receiving well; one end of the stay cable is anchored on two side surfaces of the underwater suspension tunnel, and the other end of the stay cable penetrates through a steering cable guide in the stay cable steering pier and then extends to the ground along an underwater stay cable ramp and is anchored on the stay cable anchorage pier. The inhaul cable anchor ingot system can be used for positioning the tunnel when the tunnel pipe joint is installed; and cable force monitoring and stay cable maintenance and replacement can be carried out in the tunnel operation period.
Description
Technical Field
The invention relates to an underwater suspension tunnel, in particular to a cable anchor system of an underwater cable-stayed suspension tunnel.
Background
The underwater suspension Tunnel is called a 'focused Floating Tunnel' in English, and is called 'SFT' for short. Also called Archimedes bridge in Italy, abbreviated as PDA bridge. Generally, the system consists of a tubular body floating in water to a certain depth (the tubular body has a large space enough to meet the requirements of road and railway traffic), a support system (anchor cables anchored on a seabed foundation, piers or a water buoyancy tank) and structures on both sides. The deep water type water-saving transport vehicle is a novel structure for the transport vehicle to cross between two banks separated by deep water, is suitable for all the transport vehicles needing to pass through the water, can pass trains, automobiles, small motor vehicles and pedestrians, and can be made into service channels for passing through various pipelines and cables. The differences between the underwater suspension tunnel and the traditional buried tunnel or tunneling tunnel are as follows: the suspended tunnel structure is surrounded by water and is neither located on nor traversing the ground, but is held in a fixed position primarily by the weight of its own structure, the buoyancy experienced by the structure, and the anchoring forces of the support system. The floating tunnel is sealed around, and the structure has all the characteristics of a common tunnel and is considered to be a tunnel rather than a bridge from the use point of view.
The floating tunnel may be used to traverse different bodies of water, such as rivers, fjords, straits, lakes, etc., providing a possible and acceptable form of fixed spanning structure for those areas that are considered non-traversable due to deep water or large shoreside distances. The suspension tunnel is built at a certain depth under water, and compared with an open channel on the water surface and ferry transportation, the suspension tunnel is not influenced by severe weather such as stormy waves, fog, rain, snow and the like. On the premise of ensuring the same navigation capacity, compared with a bridge, the suspension tunnel has a gentle slope and a reduced total length, and the suspension tunnel does not influence the environment and natural landscapes in the building process and the use; when the length of the cross channel or the depth of the water channel is increased, the unit cost of the suspension tunnel is not obviously increased along with the increase of the length of the cross channel or the depth of the water channel, and the unit cost of the cable-stayed bridge and the suspension bridge is obviously increased along with the increase of the span.
Although the suspension tunnel has certain advantages compared with the scheme of cross-sea passages such as immersed tube tunnels, deep-buried tunnels, bridges and the like, the design and construction of the suspension tunnel are still a worldwide problem, and no established suspension tunnel exists so far. Currently, there are mainly 7 countries (norway, italy, japan, china, swiss, brazil, usa) in the world under study, and many technical problems found by the study are mainly: overall structural arrangement, tunnel materials, anchoring system structural style, tunnel connection style and shore connection structural design, tunnel structure feasibility, construction and operation risks and the like. Whether the problems can be solved or not determines whether the suspension tunnel can be moved to actual engineering from a feasible scheme or not.
In the research on the floating tunnel, the proposed structural types can be roughly divided into three types according to the relationship between the self gravity of the floating tunnel and the received buoyancy: float type, anchor type, pier column type. The float-type suspension tunnel is formed by suspending the tunnel on a float bowl on the water surface through an anchor cable or an anchor chain, the gravity of the tunnel is greater than the buoyancy, and the vertical direction of the tunnel is greatly influenced by the fluctuation of the tide level; the anchoring type suspension tunnel is characterized in that the tunnel is anchored below a seabed on the basis of an anchorage through tension legs or anchor cables, the gravity of the tunnel is smaller than the buoyancy, and the tunnel can displace or shake under the action of hydrodynamic force; the pier column is actually a tunnel bridge supported on the underwater pier column, and the construction difficulty is high and the manufacturing cost is high. Because the tunnel floats in water, the tunnel installation construction is influenced by wind, waves, currents, ship traveling waves and the like, the underwater positioning, underwater or overwater butt joint construction difficulty of the three types of tunnels is very high, and the comfort level and the safety risk in the underwater operation period are difficult to predict.
In order to ensure that the stress of the suspension tunnel is more reasonable, reduce the influence of adverse sea conditions in the construction period and be more beneficial to the control in the construction period, the maintenance in the operation period and the replacement of parts, the construction method for pushing and installing the underwater cable-stayed cable system suspension tunnel structure and the tunnel pipe joint is provided. The underwater cable-stayed cable system suspension tunnel comprises an underwater suspension tunnel 1, a shore connection structure 2, a cable-stayed anchorage system, a floating weight ratio adjusting system, an anti-collision warning system, an escape system, tunnel auxiliary facilities and the like. The underwater suspension tunnel 1 is connected with a shore connection structure 2 and is connected with a ground road through a land slope tunnel 6, and a stay cable 3 is arranged on the underwater suspension tunnel 1 and is fixedly arranged on cable anchor piers 4 on two side banks 5 of the tunnel to form a stable stress system (see figure 1). The construction method for pushing and installing the pipe joints of the cable-stayed suspension tunnel comprises the following steps: all pipe joints are prefabricated in a prefabrication field behind a tunnel land entrance (or exit), transported into the shore structure 2 through a land slope tunnel 6, butted section by section, outfitted secondarily and sealed to enter water, pushed section by section into the shore structure 2 opposite to the shore, and after the pushing is finished, concrete on the outer surface of the pipe joints of the shore sections is poured into the shore structure 2, so that the consolidation of the pipe joints of the shore sections at two ends of the underwater suspension tunnel 1 and the shore structure 2 is finished.
Therefore, a guy cable anchor system corresponding to the underwater cable-stayed cable system suspension tunnel structure and the construction method is needed.
Disclosure of Invention
The invention aims to fill the blank of the prior art and provides a guy cable anchor system of an underwater cable-stayed suspension tunnel, which can be used for positioning the tunnel when a tunnel pipe joint is installed; in the operation period of the tunnel, the cable force monitoring and the cable maintenance and replacement can be carried out.
The purpose of the invention is realized as follows: a guy cable anchor system of an underwater cable-stayed suspension tunnel comprises a tunnel body, a butt-joint shore structure, a guy cable anchor system and a floating weight ratio adjusting system; the tunnel body comprises an underwater suspension tunnel and a land slope tunnel;
the cable anchorage system adopts a bidirectional single cable surface or a bidirectional double cable surface and comprises four cable receiving wells, four groups of cable steering piers, a cable ramp and a plurality of stay cables; wherein,
the four inhaul cable receiving wells are respectively arranged on the other shore side seashore on two sides of the tunnel and the opposite shore side seashore on two sides of the tunnel; each cable receiving well comprises a cable anchorage pier and a monitoring room; the guy cable anchorage pier is arranged at the lower part of the guy cable receiving well; a cable guide device is arranged on the water side of the guy cable anchorage pier; a cable force monitoring groove is formed in the middle of the cable anchorage pier, a cable force monitor is arranged in the cable force monitoring groove, and anchorage blocks are arranged at two ends of the cable force monitoring groove; the rear end of the guy cable anchorage pier is provided with an electric anchor machine; the monitoring chamber is arranged at the upper part of the inhaul cable receiving well, and the inhaul cable monitoring device is arranged in the monitoring chamber;
the four groups of cable steering piers are respectively arranged on the bank side coast bank slopes on two sides of the tunnel and the opposite bank side coast bank slopes on two sides of the tunnel and are close to the four cable receiving wells in a one-to-one correspondence manner; each group of stay cable steering piers are positioned at the maximum depth of the channel; the number of the stay cable steering piers in each group is half of the total number of the stay cables; the bottom of each guy cable steering pier is higher than the elevation of the underwater suspended tunnel and not higher than the minimum bottom elevation of the channel; a stay cable channel is arranged in each stay cable steering pier along the direction of a stay cable, and a steering cable guide is embedded in each stay cable channel;
the stay cable ramp is arranged on a bank slope between each group of stay cable steering piers and the corresponding stay cable receiving well;
half of the plurality of stay cables are opposite-shore side stay cables, and the other half of the plurality of stay cables are opposite-shore side stay cables; each stay cable comprises two stay cables which are respectively connected with two sides of the underwater suspension tunnel or four stay cables which are respectively connected with two sides of the underwater suspension tunnel in pairs; one end of the bank side inclined guy cable is anchored on guy cable anchors on the outer surfaces of two sides of the underwater suspended tunnel with half length close to the bank at intervals, and the other end of the bank side inclined guy cable penetrates through the two groups of guy cable steering piers arranged on the bank respectively and then extends to the ground along a guy cable ramp and is anchored on two guy cable anchor piers arranged on the bank; one end of each opposite bank side inclined guy cable is anchored on guy cable anchors on the outer surfaces of the two sides of the water suspension tunnel close to the opposite bank at intervals, and the other end of each opposite bank side inclined guy cable penetrates through two groups of guy cable steering piers arranged on the opposite bank and then extends to the ground along a guy cable ramp and is anchored on two guy cable anchor piers arranged on the opposite bank.
The cable anchor system of the underwater cable-stayed suspension tunnel further comprises four power stations which are respectively arranged on the land ground behind the four cable receiving wells.
In the cable anchor system for the underwater cable-stayed suspension tunnel, the cable anchor pier is of a reinforced concrete pier structure with a pile foundation arranged at the lower part.
In the stay cable anchor system for the underwater cable-stayed suspension tunnel, each stay cable steering pier is of a reinforced concrete pier structure with a pile foundation at the lower part.
The stay cable anchor system of the underwater cable-stayed suspension tunnel is characterized in that the structure of the stay cable ramp sequentially comprises a riprap slope protection, a gravel cushion layer and a concrete surface layer from bottom to top.
The stay cable anchor system of the underwater cable-stayed suspension tunnel is characterized in that the stay cable is an ultra-high molecular weight polyethylene fiber cable, and the underwater floating weight ratio of the stay cable is 1.
The cable anchor system of the underwater cable-stayed suspension tunnel has the following characteristics:
1) the cable anchorage system for the underwater suspension tunnel is suitable for a cable-stayed underwater suspension tunnel type, in particular to a cable-stayed suspension tunnel type adopting a pushing installation process.
2) The guy cable anchorage system can be used for positioning a tunnel when the tunnel pipe joint is installed; in the operation period of the tunnel, the cable force monitoring and the cable maintenance and replacement can be carried out.
3) According to the underwater suspended tunnel guy cable anchorage system, the stayed-cable index is extended to be above the water surface, and the guy cable anchorage pier is positioned in the guy cable monitoring room, so that the installation of the suspended tunnel pipe joint is not limited by the conditions of foreign sea hydrology and weather, and the construction period is greatly reduced.
4) The underwater suspension tunnel guy cable anchorage system can correspondingly adjust the length and the tension of the stay cable when the floating-weight ratio of the suspension tunnel is adjusted in the construction period and the operation period.
Drawings
FIG. 1 is a plan view of an underwater cable-stayed suspension tunnel;
FIG. 2 is a schematic structural diagram of a cable anchor system of the underwater cable-stayed suspension tunnel according to the invention;
FIG. 3 is a schematic structural view of a cable receiving well in the cable anchor system of the underwater cable-stayed suspension tunnel according to the present invention;
FIG. 4 is a schematic structural diagram of a cable anchor pier in the cable anchor system of the underwater cable-stayed suspension tunnel according to the present invention;
fig. 5 is a schematic structural diagram of a cable steering pier in the cable anchor system of the underwater cable-stayed suspension tunnel.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 5, the cable anchor system for an underwater cable-stayed suspension tunnel according to the present invention is applicable to an underwater cable-stayed suspension tunnel, and comprises a tunnel body, a butt-joint shore structure 2, a cable anchor system, a buoyancy ratio adjusting system, an anti-collision warning system, an escape system, and tunnel auxiliary facilities. The tunnel body comprises an underwater suspension tunnel 1 and a land slope tunnel 6, wherein the underwater suspension tunnel 1 is formed by connecting prefabricated multiple sections of tunnel pipe joints; a pair of shore structures 2 are each provided on a stable foundation adjacent the two shore slopes 5.
The cable anchorage system adopts a bidirectional single cable surface or a bidirectional double cable surface and comprises four cable receiving wells 4, four power stations 7, four groups of cable steering piers 8, a cable ramp 9 and a plurality of stay cables 3.
The four guy cable receiving wells 4 are respectively arranged on the sea shore on the opposite shore side of the two sides of the tunnel and the sea shore on the opposite shore side of the two sides of the tunnel; each cable receiving well 4 comprises a cable anchorage pier 4A and a monitoring room 4B; wherein,
the guy cable anchorage pier 4A is arranged at the lower part of the guy cable receiving well 4; the guy cable anchorage pier 4A is a reinforced concrete pier structure with a pile foundation 40 arranged at the lower part, so that the pulling resistance is increased and the stability of a bank slope is ensured; a cable guider 41 is arranged on the water side of the stay cable anchorage pier 4A, so that the stay cable 3 is turned to the horizontal direction; a cable force monitoring groove 42 is formed in the middle of the cable anchorage pier 4A, and a cable force monitor 43 is arranged in the cable force monitoring groove 42; the two ends of the cable force monitoring groove 42 are provided with anchorage blocks which are used for anchoring the stay cable 3; the rear end of the guy cable anchorage pier 4A is provided with an electric anchor machine 44 for tensioning the stay cable 3;
the monitoring room 4B is provided at the upper part of the cable receiving well 4, and a stay cable monitoring device 45 is provided in the monitoring room 4B.
The four power stations 7 are arranged on the land behind the four cable receiving wells 4 in a one-to-one correspondence manner.
The four groups of guy cable steering piers 8 are respectively arranged on the coast side bank slopes on the two sides of the tunnel and are close to the four guy cable receiving wells 4 in a one-to-one correspondence manner; each group of stay cable steering piers 8 are positioned at the maximum depth of the channel; the number of the stay cable steering piers 4 in each group is half of the total number of the stay cables 3; each guy cable steering pier 8 is a reinforced concrete pier structure with a pile foundation 80 at the lower part; the bottom of each guy cable steering pier 8 is higher than the height of the underwater suspended tunnel 1 and not higher than the minimum bottom height of the channel; and a cable channel is arranged in each cable steering pier 8 along the direction of the stay cable 3, and a steering cable guide 81 is embedded in each cable channel.
The cable ramp 9 is arranged on the bank slope between each group of cable steering piers 8 and the corresponding cable receiving well 4; the structure of the guy cable ramp 9 is sequentially a riprap slope protection, a gravel cushion layer and a concrete surface layer from bottom to top.
Half of the plurality of stay cables 3 are opposite-shore side stay cables, and the other half of the plurality of stay cables are opposite-shore side stay cables; if a bidirectional single cable plane is adopted, each stay cable 3 comprises two stay cables which are respectively connected with two sides of the underwater suspension tunnel 1; if a bidirectional double-cable surface is adopted, each stay cable 3 comprises four stay cables which are connected with two sides of the underwater suspension tunnel 1 in pairs; one ends of the bank side inclined guys are anchored on guy anchors on the outer surfaces of two sides of the underwater suspended tunnel 1 which is close to the half length of the bank at intervals, the other ends of the bank side inclined guys respectively pass through two groups of guy steering piers 8 arranged on the bank and then are led to the ground along guy ramp ways 9, and then are anchored on two guy anchor piers 4A arranged on the bank; one end of each opposite bank side inclined guy cable 3 is anchored on guy cable anchors on the outer surfaces of two sides of the water suspension tunnel 1 close to the opposite bank at intervals, and the other end of each opposite bank side inclined guy cable penetrates through two groups of guy cable steering piers 8 arranged on the opposite bank and then extends to the ground along a guy cable ramp 9 and is anchored on two guy cable anchor piers 4A arranged on the opposite bank.
The stay cable 3 is mainly used for resisting horizontal force such as water flow force, and meanwhile, in order to keep the underwater stability of the underwater suspension tunnel 1, the gravity of the underwater suspension tunnel 1 is slightly larger than buoyancy, and meanwhile, the dead weight of the underwater suspension tunnel 1 in the operation period is possibly increased, so that the stay cable 3 simultaneously bears vertical force generated by the weight of partial tunnel pipe joints, and the stay cable 3 has performance requirements of wear resistance, corrosion resistance, high tensile strength, convenience in replacement and the like, therefore, the stay cable 3 adopts an ultrahigh molecular weight polyethylene fiber cable, and the underwater floating weight ratio of the stay cable 3 is 1.
The invention discloses a stay cable anchor system of an underwater cable-stayed suspension tunnel, which is mainly used for fixing the underwater suspension tunnel 1 and has the basic principle that a stay cable 3 provides upward tensile force for the underwater suspension tunnel 1 and balances the tensile force with the generated forces of gravity, water flow force, wave force and the like borne by a tunnel pipe joint, so that the underwater suspension tunnel 1 can be stabilized at a designed position. The force is transmitted in a mode that the load borne by the tunnel pipe joint is transmitted to the stay cable anchoring pier 4A through the stay cable 3. The guy cable anchorage system needs to meet the requirements of the tunnel pipe joint underwater pushing installation process in the construction period of the suspension tunnel and the anchorage and stress monitoring requirements of the stay cable 3 in the service period of the suspension tunnel. The basic principle of design is that the stress system is reasonable, the technology is reliable, the construction is convenient, and meanwhile, the bearing has good durability and can be maintained.
The stay cable 3 is anchored on a cable anchorage pier 4A on the shore, the cable anchorage pier 4A must be positioned on a stable foundation on the coast ground, the requirement of side slope stability is met, and uplift resistance and stability calculation of the opposite bank slope must be carried out. And a cable force monitor 43 and an electric anchor machine 44 are arranged on the guy cable anchorage pier 4A and are used for cable force monitoring. The cable force monitoring and the replacement of the stay cable 3 in the operation period are carried out in a cable monitoring room 4B on the cable anchorage pier 4A. The stay cable 3 is extended to the ground along an underwater cable ramp 9 through a steering cable guider 81 in the cable steering pier 8 and is anchored on a cable anchorage pier 4A; each stay cable 3 is independently provided with a stay cable steering pier 8, and the stay cable steering piers 8 are used for steering the stay cables 3 and are used for reducing the elevation of the stay cables 3 in water so as not to influence navigation; the stay cable 3 passes through the lower part of a steering cable guider 81 in the stay cable steering pier 8 and then is guided to the water surface along the stay cable ramp 9 so as to facilitate the tensioning operation of the stay cable 3; when the stay cable 3 is tensioned, the cable deflecting block 8 is subjected to an upward pulling force, and therefore the cable deflecting block 8 must have a sufficient pullout resistance and a horizontal load bearing capability. The bottom of the stay cable steering pier 8 is higher than the elevation of the tunnel and not higher than the minimum bottom elevation of the channel, the included angle between the stay cable surface and the horizontal direction is not more than 45 degrees, and the stay cable steering pier 8 needs to be located on a stable foundation in a bank slope, so that the requirement of slope stability is met, and the anti-pulling force and the bank slope stability check calculation need to be carried out. The sloping surface of the stay cable ramp 9 is integral, namely, the range of all the stay cables 3 on one side is included, so that the stay cables 3 are prevented from being abraded, and the shore slope is protected.
The construction steps of the inhaul cable anchor system of the underwater cable-stayed suspension tunnel are as follows:
the method comprises the following steps: and (5) sinking the pile foundation of the guy cable steering pier 8 on water.
Step two: constructing a cofferdam of the stay rope steering pier 8;
step three: carrying out cast-in-place construction on the stay cable steering pier 8;
step four: constructing a cable ramp 9;
step five: carrying out concrete cast-in-place construction on the guy cable anchorage pier 4A;
step six: installing temporary guide cables of the stay cables 3 on the stay cable steering piers 8;
step seven: dismantling the cofferdam of the guy cable steering pier 8;
step eight: mounting tunnel pipe joints, mounting stay cables 3 and primarily tensioning;
step nine: adjusting the cable force of the underwater suspension tunnel 1;
step ten: and (4) mounting and sealing the anchor of the anchoring end safety cable of the stay cable 3.
The construction requirements of the guy cable anchor system of the underwater cable-stayed suspension tunnel are as follows:
the butt joint end of the stay cable 3 and the tunnel pipe joint is arranged on the shore structure 2, and the stay cable is completely and temporarily fixed on the tunnel pipe joint, and the other end of the stay cable 3 passes through the stay cable steering pier 8 by a traction rope and is led to the stay cable anchoring pier 4A. And the stay cable 3 is pushed out of the shore connection structure 2 along with the jacking of the tunnel pipe joint, then the traction rope is tensioned to lead the stay cable 3 to the stay cable anchoring pier 4A, and then the length and the tension of the stay cable 3 are adjusted according to the jacking of the tunnel pipe joint and the stress requirements of the stay cable 3. The length and the pulling force of the stay cable 3 are adjusted by an electric anchor 44 on the cable anchoring pier 4A, and the pulling force of the stay cable 3 is measured in real time by a cable force monitor 43.
The stay cable steering pier 8 is positioned in water, the pile foundation 80 can be constructed by adopting a pile driving barge or a temporary platform built on water, and the concrete abutment and the accessory facilities can be constructed after forming dry construction conditions by adopting a cofferdam method.
The part below the water surface of the stay cable ramp 9 can be excavated by a dredger, the stone is thrown on the water to protect the slope, a diver levels the broken stone foundation underwater, and the concrete surface layer is constructed by adopting a prefabricated installation method; the part above the water surface adopts an excavator to perform earthwork excavation and foundation replacement, the concrete adopts a cast-in-place process, and a temporary supporting structure can be arranged if necessary.
The construction of the structure of the guy cable anchorage well 4 is positioned at the bank side, the construction of the guy cable anchorage pier 4A can adopt a cofferdam cast-in-place method, and other structures are positioned above the land ground, so that the construction method is simple and convenient.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (6)
1. A guy cable anchor system of an underwater cable-stayed suspension tunnel comprises a tunnel body, a butt-joint shore structure, a guy cable anchor system and a floating weight ratio adjusting system; the tunnel body comprises an underwater suspension tunnel and a land slope tunnel; it is characterized in that the preparation method is characterized in that,
the cable anchorage system adopts a bidirectional single cable surface or a bidirectional double cable surface and comprises four cable receiving wells, four groups of cable steering piers, a cable ramp and a plurality of stay cables; wherein,
the four inhaul cable receiving wells are respectively arranged on the other shore side seashore on two sides of the tunnel and the opposite shore side seashore on two sides of the tunnel; each cable receiving well comprises a cable anchorage pier and a monitoring room; the guy cable anchorage pier is arranged at the lower part of the guy cable receiving well; a cable guide device is arranged on the water side of the guy cable anchorage pier; a cable force monitoring groove is formed in the middle of the cable anchorage pier, a cable force monitor is arranged in the cable force monitoring groove, and anchorage blocks are arranged at two ends of the cable force monitoring groove; the rear end of the guy cable anchorage pier is provided with an electric anchor machine; the monitoring chamber is arranged at the upper part of the inhaul cable receiving well, and the inhaul cable monitoring device is arranged in the monitoring chamber;
the four groups of cable steering piers are respectively arranged on the bank side coast bank slopes on two sides of the tunnel and the opposite bank side coast bank slopes on two sides of the tunnel and are close to the four cable receiving wells in a one-to-one correspondence manner; each group of stay cable steering piers are positioned at the maximum depth of the channel; the number of the stay cable steering piers in each group is half of the total number of the stay cables; the bottom of each guy cable steering pier is higher than the elevation of the underwater suspended tunnel and not higher than the minimum bottom elevation of the channel; a stay cable channel is arranged in each stay cable steering pier along the direction of a stay cable, and a steering cable guide is embedded in each stay cable channel;
the stay cable ramp is arranged on a bank slope between each group of stay cable steering piers and the corresponding stay cable receiving well;
half of the plurality of stay cables are opposite-shore side stay cables, and the other half of the plurality of stay cables are opposite-shore side stay cables; each stay cable comprises two stay cables which are respectively connected with two sides of the underwater suspension tunnel or four stay cables which are respectively connected with two sides of the underwater suspension tunnel in pairs; one end of the bank side inclined guy cable is anchored on guy cable anchors on the outer surfaces of two sides of the underwater suspended tunnel with half length close to the bank at intervals, and the other end of the bank side inclined guy cable penetrates through the two groups of guy cable steering piers arranged on the bank respectively and then extends to the ground along a guy cable ramp and is anchored on two guy cable anchor piers arranged on the bank; one end of each opposite bank side inclined guy cable is anchored on guy cable anchors on the outer surfaces of the two sides of the water suspension tunnel close to the opposite bank at intervals, and the other end of each opposite bank side inclined guy cable penetrates through two groups of guy cable steering piers arranged on the opposite bank and then extends to the ground along a guy cable ramp and is anchored on two guy cable anchor piers arranged on the opposite bank.
2. A cable anchor system for an underwater cable-stayed suspension tunnel according to claim 1, wherein the cable anchor system further comprises four power stations each provided on the land ground behind the four cable receiving wells.
3. The cable anchor system of the underwater cable-stayed suspension tunnel according to claim 1 or 2, wherein the cable anchor pier is a reinforced concrete pier structure with a pile foundation at the lower part.
4. The cable anchor system of an underwater cable-stayed suspension tunnel according to claim 1 or 2, wherein each cable deflector pier is a reinforced concrete pier structure having a pile foundation at the lower part.
5. The cable anchor system of the underwater cable-stayed suspension tunnel according to claim 1 or 2, wherein the structure of the cable ramp is a riprap slope, a gravel cushion layer and a concrete surface layer in sequence from bottom to top.
6. A cable anchor system for an underwater cable-stayed suspension tunnel according to claim 1 or 2, wherein the stay cable is an ultra-high molecular weight polyethylene fiber cable, and the underwater buoyant weight ratio of the stay cable is 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010063372.4A CN111254979B (en) | 2020-01-20 | 2020-01-20 | Cable anchor system of underwater cable-stayed suspension tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010063372.4A CN111254979B (en) | 2020-01-20 | 2020-01-20 | Cable anchor system of underwater cable-stayed suspension tunnel |
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| CN111851587A (en) * | 2020-07-23 | 2020-10-30 | 浙江大学 | Telescopic vibration-damping anchor-tying type suspension tunnel end connecting device and construction method |
| CN112554056A (en) * | 2020-12-16 | 2021-03-26 | 长江水利委员会长江科学院 | Horizontal anchorage structure of suspension bridge and construction method |
| CN112832323A (en) * | 2021-02-24 | 2021-05-25 | 河南省水利勘测设计研究有限公司 | Floating dock self-adaptive balancing system and balancing method |
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| CN112832323A (en) * | 2021-02-24 | 2021-05-25 | 河南省水利勘测设计研究有限公司 | Floating dock self-adaptive balancing system and balancing method |
| CN112832323B (en) * | 2021-02-24 | 2022-06-24 | 河南省水利勘测设计研究有限公司 | Floating dock self-adaptive balancing system and balancing method |
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