Suspension bridge and tunnel connection design method suitable for deep canyon area

Abstract

The invention relates to the technical field of bridges and tunnels, in particular to a suspension bridge and tunnel connection design method suitable for a deep canyon district, a first multi-arch section is arranged at a tunnel portal, and the first multi-arch section comprises a left line tunnel, an equal-thickness integral straight middle wall and a right line tunnel which are sequentially arranged from left to right; the primary supports and the secondary linings of the left line tunnel and the right line tunnel are connected to the equal-thickness integral straight middle wall; the left measuring line and the right measuring line of the first multi-arch section coincide. The left measuring line and the right measuring line of the first multi-arch section can coincide by arranging the equal-thickness integral type straight middle wall, the distance L in the prior art is eliminated, the left measuring line and the right measuring line of the suspension bridge coincide, the clear distance is zero, a main beam of the suspension bridge does not need to be widened, and the manufacturing cost is greatly saved; compared with an existing composite middle wall which directly comprises the thickness of a follow-up secondary lining, the thickness of the equal-thickness integral straight middle wall is larger, the stability in the construction process is good, and the safety risk is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridges and tunnels, in particular to a design method for connecting a suspension bridge and a tunnel in a deep canyon area. Background Art

[0002] As my country's highway construction gradually develops towards the western mountainous areas, the topographical features of the deep canyons in the western mountainous areas have brought new challenges to the construction of tunnels and bridges. The deep canyon areas in the west usually have the following characteristics: (1) The terrain on both sides of the valley is steep and there are no construction access and site conditions; (2) The geological conditions are complex, and the slope stability is poor due to the influence of rivers and streams; (3) The earthquake intensity is high, and the seismic performance requirements of the structure are high; (4) The climate is harsh, the wind field is complex, and the temperature is low; (5) The ecology is fragile. In order to adapt to the above characteristics, when crossing the deep canyon area, a suspension bridge structure with strong spanning capacity, excellent seismic performance, flexible structural settings and beautiful appearance is usually adopted. The connection type of the suspension bridge and the tunnels on both sides of the valley is the top priority in the design plan. The bridge-tunnel connection type is the result of the coordination of the line type, the suspension bridge structure and the tunnel structure, and involves the overall planning of multiple disciplines such as bridges, tunnels, route overall, and geology. Various combinations of the relative positions of the main towers of suspension bridges, tunnel anchors and tunnel structures, tunnel forms, and route directions will produce a variety of bridge-tunnel connection types. There are huge differences in the safety and convenience of structural construction, project scale, driving comfort, etc. between different types of bridge-tunnel connections.

[0003] In current engineering construction, the location, span, number of main towers, etc. of suspension bridges are usually determined according to topographic and geological conditions. When considering the connection between suspension bridges and tunnels, the route direction and the width of the main beam of the suspension bridge are more often adjusted to adapt to the tunnel portal form in order to reduce the construction risk of the tunnel portal section. Failure to systematically consider the width of the main beam of the suspension bridge, the presence or absence of the main tower and the position relationship between the main tower and the tunnel anchor will lead to a significant increase in the total scale of the bridge and tunnel project in order to blindly adapt to the needs of the tunnel portal structure, and sometimes it will greatly deteriorate the smoothness of the route of the bridge-tunnel connection section. At present, in the design of the connection between suspension bridges and tunnels, according to the plane position relationship between the line position and the tunnel anchor, it can be divided into two types:

[0004] (1) Bypass type: Use the approach bridge of the suspension bridge anchor span to split the line outside the tunnel hole, so that the left and right tunnels of the tunnel entrance become separate tunnels, reduce the mutual interference between the left and right tunnels, and at the same time make the main tunnel hole bypass the suspension bridge tunnel anchor to reduce the mutual interference between the tunnel anchor and the main tunnel hole. This type includes two situations. One is that the left and right lines are split to the two sides of the tunnel anchor to bypass (see Figure 1 and Figure 2), since the left and right tunnels of the tunnel will eventually be combined, the overall alignment of the route is poor, the scale of the tunnel cross channel is large, and the difficulty of emergency rescue during the operation period increases. The other is that the left and right lines are bypassed to the same side, but they are greatly restricted by the terrain and geological conditions of the tunnel entrance. In the above two cases, in order to meet the requirements of consistent plane alignment within the 3-second design speed travel length range inside and outside the tunnel entrance, the length of the approach bridge in the anchor span range must be greater than the sum of the length of the easement curve and the length of the 3-second design speed travel. When the length of the approach bridge is limited, it will also cause the suspension bridge to become wider, which will significantly increase the difficulty of construction.

[0005] (2) Direct-through type: The route passes between the left and right tunnel anchors of the suspension bridge (see Figure 3 and Figure 4 ), the tunnel entrance section is a straight line segment. This type includes three cases. The first is that the tunnel entrance adopts a bifurcated tunnel containing a composite curved wall and arch tunnel, and the starting point of the tunnel entrance is a composite curved wall and arch with equal thickness (see Figure 5 , L is the distance between the left and right measuring lines, a is the thickness of the curved wall); the second is that the tunnel entrance adopts a bifurcated tunnel containing a composite straight wall and continuous arch tunnel, and the starting point of the tunnel entrance is a composite straight wall and continuous arch of equal thickness (see Figure 6 , L is the distance between the left and right measuring lines, a is the thickness of the straight middle wall); the third type is a bifurcated tunnel with a continuous arch tunnel without a central guide tunnel at the tunnel entrance (see Figure 7 , L in the figure is the distance between the left and right measurement lines). Although the first two cases reduce the construction difficulty of the tunnel portal arch tunnel to a certain extent and improve the safety and durability of the structure, it is difficult to make the left and right measurement lines coincide due to the thickness of the secondary lining and the middle wall. It is necessary to widen the main beam of the suspension bridge with a full-width steel box beam or steel truss beam outside the tunnel (see Figure 8 , L in the figure is the distance between the left and right measurement lines), which will increase the scale of the suspension bridge by tens of millions or even hundreds of millions of yuan. The third case is difficult to construct, the impact of the rear tunnel on the front tunnel is large, the structural safety risk is high, and it is also difficult to make the left and right measurement lines coincide due to the influence of the secondary lining and the initial support thickness.

[0006] Combination Figure 5 , Figure 6 and Figure 7 It can be seen that the existing straight-through suspension bridge-tunnel connection designs are unable to achieve the coincidence of the left and right measurement lines of the tunnel section. Both require the widening of the main beam of the suspension bridge outside the tunnel, which significantly increases the overall scale of the suspension bridge-tunnel connection. Moreover, when the thickness of the middle wall is small or no middle wall is set, the construction is difficult and the structural safety risk is high. Summary of the invention

[0007] The purpose of the present invention is to provide a suspension bridge-tunnel connection design method suitable for deep canyon areas, in view of the problem that in the prior art, there is a spacing L between the left and right measuring lines of the tunnel in the design of the connection between the straight-through suspension bridge and the tunnel, which requires widening the main beam of the suspension bridge, increases the construction cost, and has high safety risks during the construction process, and is prone to safety risks.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] In the first aspect, the present invention provides a suspension bridge-tunnel connection design method suitable for deep canyon areas, wherein a first arch section is arranged at the tunnel entrance, and the first arch section includes a left-line tunnel, an integral straight center wall of equal thickness, and a right-line tunnel arranged in sequence from left to right, that is, the first arch section is an integral straight center wall arch section of equal thickness; the initial support and secondary lining of the left-line tunnel and the right-line tunnel are both connected to the integral straight center wall of equal thickness; the left-line measuring line and the right-line measuring line of the first arch section coincide.

[0010] By adopting the suspension bridge-tunnel connection design method suitable for deep canyon areas described in the present invention, by setting the first arch section, taking the equal-thickness integral straight center wall as a reference, the support structures of the left-line tunnel and the right-line tunnel can be respectively connected to the equal-thickness integral straight center wall to form a closed loop; and by setting the equal-thickness integral straight center wall, the left-line measuring line and the right-line measuring line of the first arch section can also be overlapped, eliminating the spacing L in the prior art, so that the left and right span measuring lines of the suspension bridge overlap, the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost; by setting the equal-thickness integral straight center wall, compared with the existing composite center wall, the thickness of the subsequent secondary lining is directly included, that is, the thickness of the equal-thickness integral straight center wall is much greater than the thickness of the existing composite center wall, the stability is good during the construction process, and the risk of safety accidents is greatly reduced.

[0011] As a preferred technical solution of the present invention, the first arch section and the suspension bridge are located in the same straight line segment, and the length of the first arch section is not less than the 3s design speed travel length.

[0012] As a further preferred technical solution of the present invention, the first arch section, the second arch section and the separated tunnel section are sequentially connected from the tunnel entrance, and the second arch section is a variable thickness integral straight center wall arch section.

[0013] As a further preferred technical solution of the present invention, the first arch section, the second arch section, the third arch section and the separated tunnel section are sequentially connected from the tunnel entrance, and the third arch section is a composite arch section.

[0014] As a further preferred technical solution of the present invention, the first arch section, the second arch section, the variable thickness composite straight wall arch section, the variable thickness composite curved wall arch section, and the separated tunnel section are sequentially connected and arranged from the tunnel entrance.

[0015] In the second aspect, the present invention also provides a suspension bridge-tunnel connection structure suitable for deep canyon areas, comprising a first arch section, wherein the first arch section includes a left-line tunnel, an integral straight center wall of equal thickness and a right-line tunnel arranged in sequence from left to right; the initial support and secondary lining of the left-line tunnel and the right-line tunnel are both connected to the integral straight center wall of equal thickness; the left-line measuring line and the right-line measuring line of the first arch section coincide.

[0016] By adopting the suspension bridge-tunnel connection structure suitable for deep canyon areas described in the present invention, by setting the first connecting arch section, taking the equal-thickness integral straight center wall as a reference, the supporting structures of the left-line tunnel and the right-line tunnel can be respectively connected to the equal-thickness integral straight center wall to be closed into a ring; and by setting the equal-thickness integral straight center wall, the left-line measuring line and the right-line measuring line of the first connecting arch section can also be overlapped, eliminating the spacing L in the prior art, so that the left and right span measuring lines of the suspension bridge overlap, the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost; by setting the equal-thickness integral straight center wall, compared with the existing composite center wall, the thickness of the subsequent secondary lining is directly included, that is, the thickness of the equal-thickness integral straight center wall is much greater than the thickness of the existing composite center wall, the stability is good during the construction process, and the risk of safety accidents is greatly reduced.

[0017] As a preferred technical solution of the present invention, the thickness of the uniform thickness integral straight center wall is 1.2m to 1.4m.

[0018] In a third aspect, the present invention further provides a construction method for a suspension bridge-tunnel connection structure in a deep canyon area as described in any one of the above items, comprising the following steps:

[0019] S1, constructing and forming the uniform thickness integral straight center wall;

[0020] S2, constructing the initial support of the left-line tunnel and the right-line tunnel, wherein one end of the initial support is connected to the top of the uniform-thickness integral straight center wall, and the other end is connected to the bottom of the uniform-thickness integral straight center wall;

[0021] S3. Construct the secondary lining of the left-line tunnel and the right-line tunnel, wherein one end of the secondary lining is connected to the top of the uniform-thickness integral straight center wall, and the other end is connected to the bottom of the uniform-thickness integral straight center wall, to form the first continuous arch section.

[0022] By adopting the construction method for connecting a suspension bridge and a tunnel in a deep canyon area described in the present invention, by setting the first connecting arch section, taking the equal-thickness integral straight center wall as a reference, the supporting structures of the left-line tunnel and the right-line tunnel can be respectively connected to the equal-thickness integral straight center wall to form a closed ring; and by setting the equal-thickness integral straight center wall, the left-line measuring line and the right-line measuring line of the first connecting arch section can also be overlapped, eliminating the spacing L in the prior art, so that the left and right span measuring lines of the suspension bridge overlap, the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost; by setting the equal-thickness integral straight center wall, compared with the existing composite center wall, the thickness of the subsequent secondary lining is directly included, that is, the thickness of the equal-thickness integral straight center wall is much greater than the thickness of the existing composite center wall, the stability is good during the construction process, and the risk of safety accidents is greatly reduced.

[0023] As a preferred technical solution of the present invention, the top and bottom pre-buried steel plates are provided before pouring the uniform thickness integral straight center wall. When the initial support is performed, the steel arch frame joint steel plates of the initial support are fixedly connected to the pre-buried steel plates.

[0024] As a preferred technical solution of the present invention, the top and bottom pre-buried sleeves are provided before pouring the uniform thickness integral straight center wall, and the secondary lining steel bars are implanted and anchored in the pre-buried sleeves before pouring the secondary lining.

[0025] As a preferred technical solution of the present invention, the first arch section of the tunnel entrance is reinforced, and the reinforcement includes one or more of grouting on the surface and inside the tunnel, anti-sliding piles outside the tunnel, backfilling and counterpressure outside the tunnel, and lining inside the tunnel.

[0026] As a preferred technical solution of the present invention, grouting is performed on the top of the equal-thickness integral straight center wall of the tunnel entrance to reinforce the surrounding rock and close the surrounding rock cracks. At the same time, measures such as pre-embedded water-swelling waterstop strips in the middle of the secondary lining and hanging water collection boxes on the outside of the construction joint are taken to improve the waterproof effect of the wall top.

[0027] In a fourth aspect, the present invention further provides a suspension bridge-tunnel connection structure suitable for deep canyon areas, comprising a suspension bridge and a tunnel;

[0028] The suspension bridge and the tunnel are connected by using any of the above-mentioned suspension bridge-tunnel connection design methods applicable to deep canyon areas;

[0029] Or the suspension bridge and the tunnel are connected by a suspension bridge-tunnel connection structure applicable to deep canyon areas as described in any one of the above items;

[0030] Alternatively, the suspension bridge and the tunnel are connected using any of the above-described construction methods applicable to suspension bridge-tunnel connection structures in deep canyon areas.

[0031] By adopting the suspension bridge-tunnel connection structure suitable for deep canyon areas described in the present invention, by setting the first connecting arch section, taking the equal-thickness integral straight center wall as a reference, the supporting structures of the left-line tunnel and the right-line tunnel can be respectively connected to the equal-thickness integral straight center wall to form a closed ring; and by setting the equal-thickness integral straight center wall, the left-line measuring line and the right-line measuring line of the first connecting arch section can also be overlapped, eliminating the spacing L in the prior art, so that the left and right span measuring lines of the suspension bridge overlap, the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost; by setting the equal-thickness integral straight center wall, compared with the existing composite center wall, the thickness of the subsequent secondary lining is directly included, that is, the thickness of the equal-thickness integral straight center wall is much greater than the thickness of the existing composite center wall, the stability is good during the construction process, and the risk of safety accidents is greatly reduced.

[0032] In a fifth aspect, the present invention also provides an application of the suspension bridge-tunnel connection structure as described above in the cable-stayed bridge-tunnel connection in deep canyon areas.

[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0034] The present invention discloses a suspension bridge-tunnel connection design method suitable for deep canyon areas. By setting the first connecting arch section, the supporting structures of the left-line tunnel and the right-line tunnel can be respectively connected to the equal-thickness integral straight center wall to form a closed loop; and by setting the equal-thickness integral straight center wall, the left-line measuring line and the right-line measuring line of the first connecting arch section can be overlapped, eliminating the spacing L in the prior art, so that the left and right span measuring lines of the suspension bridge overlap, the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost; by setting the equal-thickness integral straight center wall, compared with the existing composite center wall, the thickness of the subsequent secondary lining is directly included, that is, the thickness of the equal-thickness integral straight center wall is much greater than the thickness of the existing composite center wall, the stability is good during the construction process, and the risk of safety accidents is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a longitudinal schematic diagram of the existing two-side bypass type suspension bridge-tunnel connection;

[0036] Figure 2 It is a schematic plan view of the existing two-side bypass type suspension bridge-tunnel connection;

[0037] Figure 3 It is a longitudinal schematic diagram of the existing straight-through suspension bridge-tunnel connection;

[0038] Figure 4 It is a plan view of the connection between the existing straight-through suspension bridge and tunnel;

[0039] Figure 5It is a schematic cross-sectional view of an existing composite curved wall multi-arch tunnel;

[0040] Figure 6 It is a schematic cross-sectional view of an existing composite straight-middle-wall multi-arch tunnel;

[0041] Figure 7 It is a schematic cross-sectional view of an existing multi-arch tunnel without a central pilot tunnel;

[0042] Figure 8 It is a schematic diagram of the width of the steel truss girder of an existing suspension bridge;

[0043] Fig. 9 A schematic longitudinal diagram of the connection between the suspension bridge and tunnel in this application;

[0044] Fig.10 This is a schematic plan view of the connection between the suspension bridge and tunnel in this application;

[0045] Fig.11 This is a schematic cross-sectional view of the first arch section tunnel of this application.

[0046] Markings in the figure:

[0047] 01-tunnel, 02-tunnel portal, 03-approach bridge, 04-main span, 05-main tower of suspension bridge, 06-tunnel anchor of suspension bridge;

[0048] 1-first arch section, 2-second arch section, 3-third arch section, 4-separated tunnel section;

[0049] 11-uniform thickness integral straight center wall, 12-left line measurement line, 13-right line measurement line, 14-initial support, 15-secondary lining. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0051] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0052] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0053] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0054] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0055] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0056] In the related art, in the design scheme of connecting suspension bridges and tunnels, the bypass type reduces the construction difficulty of the composite arch tunnel at the tunnel portal to a certain extent compared to the straight-through type, and improves the safety and durability of the structure. However, the bypass type has higher requirements on the length of the approach bridge outside the tunnel and the direction of the route, while the straight-through type suspension bridge and tunnel connection design cannot make the left and right measurement lines of the portal section coincide with each other. Both require the widening of the main beam of the suspension bridge using a whole-width steel box beam or steel truss beam outside the tunnel, which will increase the scale of the suspension bridge by tens of millions or even hundreds of millions of yuan. At the same time, when the thickness of the middle wall is small or no middle wall is set, the construction difficulty is high and the structural safety risk is high. For this reason, the technical solution of the present application is produced, and the following is combined with Figures 9 to 11 To elaborate.

[0057] Example 1

[0058] like Figures 9 to 11 As shown, the present invention discloses a suspension bridge-tunnel connection design method applicable to deep canyon areas, comprising the following steps:

[0059] Tunnel 01 passes through the left and right suspension bridge tunnel anchors 06 in the plane, and the entrance section of Tunnel 01 is a bifurcated tunnel.

[0060] Starting from the tunnel entrance 02, the first arch section 1, the second arch section 2, the third arch section 3, and the separated tunnel section 4 are arranged in sequence, the first arch section 1 is an integral straight wall arch section with constant thickness, the second arch section 2 is an integral straight wall arch section with variable thickness, the third arch section 3 is a composite arch section, the first arch section 1 and the second arch section 2 together constitute an integral straight wall arch section, and the third arch section 3 can include at least one of a composite straight wall arch section with variable thickness and a composite curved wall arch section with variable thickness.

[0061] In an optional embodiment, starting from the tunnel entrance 02, a first arch section 1, a second arch section 2, a variable thickness composite straight wall arch section, a variable thickness composite curved wall arch section, and a separated tunnel section 4 are arranged in sequence.

[0062] The integral straight center wall arch section includes a left-line tunnel, an integral straight center wall and a right-line tunnel arranged in sequence from left to right; wherein, the integral straight center wall of the first arch section 1 is set with equal thickness, that is, an integral straight center wall 11 with equal thickness, and the integral straight center wall of the second arch section 2 is set with gradual thickness.

[0063] The initial support 14 and the secondary lining 15 of the left-line tunnel and the right-line tunnel are both connected to the integral straight center wall; the left-line measuring line 12 and the right-line measuring line 13 of the first continuous arch section 1 coincide with each other.

[0064] When the tunnel length is short, it may only include a part of the bifurcated tunnel. However, no matter the length of the tunnel connecting the bridge and the tunnel, the first connecting arch section 1 should be provided to achieve the minimum width of the main beam of the suspension bridge.

[0065] The first arch section 1 and the suspension bridge are located in the same straight line segment, and the length of the first arch section 1 is not less than the 3s design speed travel length.

[0066] The thickness of the uniform thickness integral straight center wall 11 is 1.2m to 1.4m.

[0067] The mutual influence between the suspension bridge tunnel anchor 06 and the main hole of tunnel 01 can be reduced by adjusting the main cable division angle and inclination angle of the suspension bridge anchor span, the length and cross-sectional size of each anchor chamber of the suspension bridge tunnel anchor 06, and the reliability of the suspension bridge tunnel anchor 06 can be improved.

[0068] It can be seen that after technical research, a systematic study was conducted on the relative positions of the suspension bridge main tower 05, the suspension bridge tunnel anchor 06 and the tunnel 01 structure, the form of tunnel 01, and the route direction. When the suspension bridge is connected to tunnel 01, a bifurcated tunnel containing the first arch section 1 is used at the tunnel entrance 02, which can not only ensure structural safety, but also significantly reduce the total scale of the bridge-tunnel connection project, reduce the mutual influence between the suspension bridge tunnel anchor 06 and the main tunnel of tunnel 01, and greatly improve the overall line shape of the route. It is a suspension bridge-tunnel connection design method with a wider range of applications.

[0069] The present embodiment describes a suspension bridge-tunnel connection design method suitable for deep canyon areas. By setting the first connecting arch section 1 and taking the uniform thickness integral straight center wall 11 as a reference, the supporting structures of the left-line tunnel and the right-line tunnel can be respectively connected to the uniform thickness integral straight center wall 11 to form a closed ring.

[0070] The present embodiment describes a suspension bridge-tunnel connection design method suitable for deep canyon areas. By setting the equal-thickness integral straight center wall 11, the left-line measuring line 12 and the right-line measuring line 13 of the first arch section 1 can be overlapped, thereby eliminating the spacing L in the prior art, so that the left and right measurement lines of the suspension bridge overlap, the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost.

[0071] The present embodiment describes a suspension bridge-tunnel connection design method suitable for deep canyon areas. By setting the uniform thickness integral straight center wall 11, the thickness of the subsequent secondary lining 15 is directly included compared to the existing composite center wall. That is, the thickness of the uniform thickness integral straight center wall 11 is much greater than the thickness of the existing composite center wall, and the stability during construction is good, which greatly reduces the risk of safety accidents.

[0072] The present embodiment describes a suspension bridge-tunnel connection design method suitable for deep canyon areas, and can be used regardless of whether the suspension bridge is provided with a suspension bridge main tower 05 , whether there is an approach bridge 03 , or the length of the approach bridge 03 .

[0073] Example 2

[0074] like Figures 9 to 11 As shown, the present invention is suitable for a suspension bridge-tunnel connection structure in a deep canyon area, including an integral straight center wall arch section. Along the length direction of the tunnel, the integral straight center wall arch section includes a first arch section 1 and a second arch section 2 connected to each other. The first arch section 1 is an integral straight center wall arch section of equal thickness, and the second arch section 2 is an integral straight center wall arch section of variable thickness.

[0075] The integral straight center wall arch section includes a left-line tunnel, an integral straight center wall and a right-line tunnel arranged in sequence from left to right; wherein, the integral straight center wall of the first arch section 1 is set with equal thickness, that is, an integral straight center wall 11 with equal thickness, and the integral straight center wall of the second arch section 2 is set with gradual thickness.

[0076] The primary support 14 and secondary lining 15 of the left tunnel and the right tunnel are connected to the integral straight center wall; the left line measurement line 12 and the right line measurement line 13 of the first arch section 1 coincide. Tunnel 01 passes between the left and right suspension bridge tunnel anchors 06 in the plane.

[0077] In an optional embodiment, the thickness of the uniform thickness integral straight center wall 11 is 1.2m to 1.4m, the first arch section 1 and the suspension bridge are located in the same straight line segment, and the length of the first arch section 1 is not less than the 3s design speed travel length.

[0078] In an optional embodiment, the first arch section 1, the second arch section 2, the third arch section 3, and the separated tunnel section 4 are arranged in sequence starting from the tunnel entrance 02. The third arch section 3 is a composite arch section, and the third arch section 3 includes at least one of a variable thickness composite straight wall arch section and a variable thickness composite curved wall arch section.

[0079] As a preferred embodiment, the first arch section 1, the second arch section 2, the variable thickness composite straight wall arch section, the variable thickness composite curved wall arch section, and the separated tunnel section 4 are arranged in sequence starting from the tunnel entrance 02.

[0080] In an optional embodiment, when the tunnel length is short, only a part of the bifurcated tunnel may be included. However, regardless of the length of the tunnel connecting the bridge and the tunnel, the first connecting arch section 1 should be provided to achieve the minimum width of the main beam of the suspension bridge.

[0081] In an optional embodiment, the mutual influence between the suspension bridge tunnel anchor 06 and the main hole of the tunnel 01 can be reduced by adjusting the main cable division angle and inclination angle of the suspension bridge anchor span, the length and cross-sectional size of each anchor chamber of the suspension bridge tunnel anchor 06, and the reliability of the suspension bridge tunnel anchor 06 can be improved.

[0082] The present embodiment is a suspension bridge-tunnel connection structure suitable for deep canyon areas. By setting the first connecting arch section 1, the support structures of the left-line tunnel and the right-line tunnel can be connected to the uniformly thick integral straight center wall 11 to form a closed loop. By setting the uniformly thick integral straight center wall 11, the left-line measurement line 12 and the right-line measurement line 13 of the first connecting arch section 1 can be overlapped, eliminating the spacing L in the prior art, so that the left and right span measurement lines of the suspension bridge overlap. , the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost; by setting the equal-thickness integral straight center wall 11, compared with the existing composite center wall, the thickness of the subsequent secondary lining 15 is directly included, that is, the thickness of the equal-thickness integral straight center wall 11 is much greater than the thickness of the existing composite center wall, and the stability is good during the construction process, which greatly reduces the risk of safety accidents; in addition, the implementation of this structure can be used without considering whether the suspension bridge is equipped with a suspension bridge main tower 05, whether there is an approach bridge 03 or the length of the approach bridge 03.

[0083] Example 3

[0084] like Figures 9 to 11 As shown, the construction method of the present invention as described in Example 2, which is applicable to the connection structure of the suspension bridge and tunnel in the deep canyon area, comprises the following steps:

[0085] S1, constructing an integral straight center wall, wherein the uniform thickness integral straight center wall 11 is constructed in the first connected arch section 1, and the variable thickness integral straight center wall is constructed in the second connected arch section 2;

[0086] S2, constructing the initial support 14 of the left-line tunnel and the right-line tunnel, wherein one end of the initial support 14 is connected to the top of the integral straight center wall, and the other end is connected to the bottom of the integral straight center wall;

[0087] S3. Construct the secondary lining 15 of the left-line tunnel and the right-line tunnel, wherein one end of the secondary lining 15 is connected to the top of the integral straight center wall, and the other end is connected to the bottom of the integral straight center wall, to form the integral straight center wall continuous arch section.

[0088] In an optional embodiment, steel plates are embedded at the top and bottom of the integral straight center wall before casting. When the initial support 14 is applied, the steel arch joint steel plates of the initial support 14 are fixedly connected to the embedded steel plates, such as by welding or bolting, to ensure that the initial support 14 is stable at the bottom.

[0089] In an optional embodiment, steel sleeves are embedded at the top and bottom of the integral straight center wall before casting, and secondary lining steel bars are implanted in the embedded sleeves before casting the secondary lining 15, and are anchored with a resin anchor to ensure the integrity of the integral straight center wall and the secondary lining 15.

[0090] In an optional embodiment, the integral straight wall and arch section of the tunnel entrance 02 is reinforced, and the reinforcement includes one or more of grouting on the surface and inside the tunnel, anti-sliding piles outside the tunnel, backfill back pressure outside the tunnel, and lining inside the tunnel to improve the seismic performance of the integral straight wall and arch section.

[0091] In an optional embodiment, grouting is performed on the top of the integral straight center wall of the tunnel entrance to reinforce the surrounding rock and close the surrounding rock cracks. At the same time, measures such as pre-embedded water-swelling waterstop strips in the middle of the secondary lining 15 and hanging water boxes on the outside of the construction joints are taken to improve the waterproof effect of the wall top.

[0092] In an optional embodiment, a permanent monitoring system is provided to monitor the health status of the suspension bridge-tunnel connection structure applicable to deep canyon areas during the operation period.

[0093] The present embodiment describes a construction method for a suspension bridge-tunnel connection structure in a deep canyon area. By setting the first connecting arch section 1 and taking the uniform thickness integral straight center wall 11 as a reference, the supporting structures of the left-line tunnel and the right-line tunnel can be respectively connected to the uniform thickness integral straight center wall 11 to form a closed loop; and by setting the uniform thickness integral straight center wall 11, the left-line measuring line 12 and the right-line measuring line 13 of the first connecting arch section 1 can also be overlapped, thereby eliminating the spacing L in the prior art, so that the left and right span measuring lines of the suspension bridge overlap, and the net distance is zero, and there is no need to widen the main beam of the suspension bridge, thereby greatly saving the construction cost; by setting the uniform thickness integral straight center wall 11, compared with the existing composite center wall, the thickness of the subsequent secondary lining 15 is directly included, that is, the thickness of the uniform thickness integral straight center wall 11 is much greater than the thickness of the existing composite center wall, and the stability is good during the construction process, which greatly reduces the risk of safety accidents.

[0094] Example 4

[0095] like Figures 9 to 11 As shown, the present invention is a suspension bridge-tunnel connection structure suitable for deep canyon areas, including a suspension bridge and a tunnel 01;

[0096] The suspension bridge and the tunnel 01 are connected by using the suspension bridge-tunnel connection design method applicable to deep canyon areas as described in Example 1;

[0097] Alternatively, the suspension bridge and the tunnel 01 are connected by a suspension bridge-tunnel connection structure suitable for deep canyon areas as described in Example 2;

[0098] Alternatively, the suspension bridge and the tunnel 01 are connected using the construction method described in Example 3 that is applicable to the connection structure of a suspension bridge and a tunnel in a deep canyon area.

[0099] In an optional embodiment, the suspension bridge includes a suspension bridge main tower 05, a main span 04, an approach bridge 03 and a suspension bridge tunnel anchor 06. Fig. 9 As shown, from the elevation, the suspension bridge tunnel anchor 06 is arranged above the tunnel 01, as shown in FIG. Fig.10 As shown, from a plane view, the tunnel 01 passes between the left and right suspension bridge tunnel anchors 06, and the suspension bridge is connected to the tunnel opening 02 of the tunnel 01 through the approach bridge 03. Of course, from a vertical view, the suspension bridge tunnel anchor 06 can be arranged below the tunnel 01; it is also possible that the tunnel 01 passes through the suspension bridge tunnel anchor 06 from a vertical view, and there is a distance between the two from a plane view.

[0100] The present embodiment describes a suspension bridge-tunnel connection structure suitable for deep canyon areas. By setting the first connecting arch section 1, the support structures of the left-line tunnel and the right-line tunnel can be respectively connected to the equal-thickness integral straight center wall 11 to form a closed ring; and by setting the equal-thickness integral straight center wall 11, the left-line measuring line 12 and the right-line measuring line 13 of the first connecting arch section 1 can also be overlapped, eliminating the spacing L in the prior art, so that the left and right span measuring lines of the suspension bridge overlap, the net distance is zero, and there is no need to widen the main beam of the suspension bridge, which greatly saves the cost; by setting the equal-thickness integral straight center wall 11, compared with the existing composite center wall, the thickness of the subsequent secondary lining 15 is directly included, that is, the thickness of the equal-thickness integral straight center wall 11 is much greater than the thickness of the existing composite center wall, the stability is good during construction, and the risk of safety accidents is greatly reduced.

[0101] Example 5

[0102] The present invention describes an application of a suspension bridge-tunnel connection structure suitable for deep canyon areas as described in Example 4 to the connection of cable-stayed bridges and tunnels, thereby reducing the overall scale of cable-stayed bridges and tunnels.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A suspension bridge-tunnel connection design method suitable for deep canyon areas, characterized in that: A first continuous arch section (1) is arranged at the tunnel entrance (02), wherein the first continuous arch section (1) comprises a left-line tunnel, an integral straight center wall (11) of equal thickness, and a right-line tunnel arranged in sequence from left to right; The initial support (14) and the secondary lining (15) of the left-line tunnel and the right-line tunnel are both connected to the uniform-thickness integral straight center wall (11); The left-line measuring line (12) and the right-line measuring line (13) of the first arch section (1) coincide with each other.

2. The suspension bridge-tunnel connection design method applicable to deep canyon areas according to claim 1 is characterized in that: The first continuous arch section (1) and the suspension bridge are located in the same straight line segment, and the length of the first continuous arch section (1) is not less than the 3s design speed travel length.

3. The suspension bridge-tunnel connection design method applicable to deep canyon areas according to claim 1 is characterized in that: The first connecting arch section (1), the second connecting arch section (2), and the separated tunnel section (4) are sequentially connected and arranged from the tunnel entrance; the second connecting arch section (2) is a variable thickness integral straight center wall connecting arch section.

4. A suspension bridge-tunnel connection structure suitable for deep canyon areas, characterized in that: It comprises a first continuous arch section (1), wherein the first continuous arch section (1) comprises a left-line tunnel, an integral straight center wall (11) of equal thickness, and a right-line tunnel arranged in sequence from left to right; The initial support (14) and the secondary lining (15) of the left-line tunnel and the right-line tunnel are both connected to the uniform-thickness integral straight center wall (11); The left-line measuring line (12) and the right-line measuring line (13) of the first arch section (1) coincide with each other.

5. The suspension bridge-tunnel connection structure applicable to deep canyon areas according to claim 4, characterized in that: The thickness of the uniform thickness integral straight center wall (11) is 1.2m-1.4m.

6. A construction method for a suspension bridge-tunnel connection structure in a deep canyon area as claimed in any one of claims 4 to 5, characterized in that: The following steps are involved: S1, constructing and forming the uniform thickness integral straight center wall (11); S2, constructing the initial support (14) of the left-line tunnel and the right-line tunnel, wherein one end of the initial support (14) is connected to the top of the uniform thickness integral straight center wall (11), and the other end is connected to the bottom of the uniform thickness integral straight center wall (11); S3. Construct the secondary lining (15) of the left-line tunnel and the right-line tunnel, wherein one end of the secondary lining (15) is connected to the top of the uniform-thickness integral straight center wall (11), and the other end is connected to the bottom of the uniform-thickness integral straight center wall (11), to form the first continuous arch section (1).

7. The construction method for connecting a suspension bridge and a tunnel in a deep canyon area according to claim 6, characterized in that: The top and bottom of the uniform thickness integral straight center wall (11) are pre-buried with steel plates before casting. When the initial support (14) is applied, the steel arch frame joint steel plates of the initial support (14) are fixedly connected to the pre-buried steel plates.

8. The construction method for connecting a suspension bridge and a tunnel in a deep canyon area according to any one of claims 6 to 7, characterized in that: Before pouring the uniform thickness integral straight center wall (11), pre-buried sleeves are provided at the top and bottom, and before pouring the secondary lining (15), secondary lining steel bars are implanted and anchored in the pre-buried sleeves.

9. A suspension bridge-tunnel connection structure suitable for deep canyon areas, comprising a suspension bridge and a tunnel (01), It is characterized by: The suspension bridge and the tunnel (01) are connected by using the suspension bridge-tunnel connection design method applicable to deep canyon areas as described in any one of claims 1 to 3; Or the suspension bridge and the tunnel (01) are connected by a suspension bridge-tunnel connection structure suitable for deep canyon areas as described in any one of claims 4 to 5; Alternatively, the suspension bridge and the tunnel (01) are connected by using the construction method for connecting suspension bridges and tunnels in deep canyon areas as described in any one of claims 6 to 8.

10. An application of the suspension bridge-tunnel connection structure suitable for deep canyon areas as claimed in claim 9 in the connection of cable-stayed bridges and tunnels.

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