L-shaped crossed subway transfer channel structure

Abstract

The invention relates to the field of metro transfer channels, and discloses an L-shaped crossed metro transfer channel structure which comprises an upper-layer platform and a lower-layer platform, a first interval tunnel is arranged on the side, close to the lower-layer platform, of the upper-layer platform, and the L-shaped crossed metro transfer channel structure is characterized in that the L-shaped crossed metro transfer channel structure further comprises a transfer channel which comprises a first transfer section, an underpass section and a second transfer section, the first transfer section and the second transfer section are both obliquely arranged downwards, the first transfer section communicates with the end of the upper-layer platform, the underpass section and the first transfer section are perpendicular in the horizontal direction, the underpass section penetrates through the lower portion of the first interval tunnel, the underpass section is formed by excavating the first interval tunnel downwards, and a supporting plate is arranged between the underpass section and the first interval tunnel. The construction influence on the platform layer and the interval tunnel is minimized, and the structural safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of subway transfer passages, and specifically to an L-shaped intersecting subway transfer passage structure. Background Technology

[0002] Because of the large span of the tunnel excavation, subway stations built using the cut-and-cover method generally have a considerable burial depth to ensure structural safety. In such cases, if transfer functionality is required, passengers often need to walk from the platform level of their current station to the concourse level, then from the concourse level to the concourse level of the transfer station, and finally from the concourse level of the transfer station back to the platform level. This results in longer transfer distances, increasing passenger transfer time and, to some extent, reducing the transfer experience.

[0003] If the two platform levels are directly connected, a passageway needs to be set up between the two platform levels. There are also tunnels on both sides of the platform level for the subway to pass through. The tunnels are densely and complexly arranged, and they have a great deal of mutual influence during construction, making the construction difficult.

[0004] Therefore, a subway transfer passage structure is needed to minimize the impact on the construction of the platform level and the tunnel section, and to ensure structural safety. Summary of the Invention

[0005] The present invention aims to provide an L-shaped intersecting subway transfer passage structure that minimizes the impact on the construction of the platform level and the tunnel section, and ensures structural safety.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an L-shaped intersecting subway transfer passage structure, including an upper platform and a lower platform, wherein a first section tunnel is provided on the side of the upper platform near the lower platform, and a transfer passage is also provided, wherein the transfer passage includes a first transfer section, an underpass section and a second transfer section connected in sequence, both the first transfer section and the second transfer section are inclined downwards, the first transfer section is connected to the end of the upper platform, the underpass section is perpendicular to the first transfer section in the horizontal direction, the underpass section passes under the first section tunnel, the underpass section is formed by excavating downwards from the first section tunnel, and a support plate is provided between the underpass section and the first section tunnel.

[0007] The beneficial effects of this plan are: 1. The first transfer section, the underpass section and the second transfer section realize a convenient transfer method between subway underground stations. It is a convenient platform-to-platform transfer. Passengers can transfer from the upper platform to the lower platform (and vice versa) in a very short distance without having to go through the concourse to the platform.

[0008] 2. The core part is a double-layer structure shared by the underpass section and the first section tunnel, which avoids the risk of constructing two separate tunnels at close range.

[0009] 3. The first transfer section is set downwards, forming three independent and parallel stacked tunnels that are gradually staggered vertically with the section tunnel (the tunnel for subway passage) departing from the same platform. Although the horizontal distance is small, by lowering the standard component elevation, the structural clearance between the three tunnels is gradually increased, reducing construction risks.

[0010] 4. The first transfer section, the underpass section, and the second transfer section can be constructed separately to reduce the impact. The tunnel length between the three sections is very short, and can be completed quickly through mechanical excavation combined with manual chiseling.

[0011] 5. The transfer passage is short, designed according to common Chongqing dimensions, with a total length of only 28.64 meters. The tunnel construction cost is low, and it can realize convenient transfer.

[0012] Furthermore, the first transfer section, the first section tunnel, and the underpass section will be constructed sequentially; During the construction phase of the first transfer section, a first anchorage zone is set up on the side of the first transfer section near the first section tunnel. The first anchorage zone includes the side projection area of ​​the first section tunnel on the side wall of the first transfer section. Several first horizontal anchors are set up in the first anchorage zone, and all the first horizontal anchors penetrate into the excavation outline of the first section tunnel.

[0013] Furthermore, the lengths of the first horizontal anchor bolts inserted into the excavation profile of the first tunnel section are the same.

[0014] Furthermore, during the construction phase of the first transfer section, the connection point between the first transfer section and the underpass section is the second anchorage zone. Several second horizontal anchors are installed in the second anchorage zone, with the ends of the second horizontal anchors located below the first section tunnel.

[0015] Furthermore, during the construction phase of the first transfer section, a first ring beam is provided on the side of the second anchorage zone closest to the first transfer section, and the first ring beam surrounds the second anchorage zone. During the construction phase of the first tunnel section, after the downward excavation of the underpass section, a second ring beam is installed on the side of the second anchorage zone near the first tunnel section. The second ring beam surrounds the corresponding area of ​​the second anchorage zone of the underpass section.

[0016] Furthermore, during the first tunnel construction phase, the surrounding rock and the second horizontal anchor bolts in the second anchorage zone were removed.

[0017] Furthermore, during the construction phase of the first transfer section, anchor holes are provided in the second anchoring zone, and second horizontal anchor rods are installed in the anchor holes. The second horizontal anchor rod includes an anchoring section, which is located below the tunnel of the first section. The rod body part other than the anchoring section is slidably connected to the inner wall of the anchor hole. During the construction phase of the first tunnel section, the downward excavation of the underpass section damaged the anchorage section of the second horizontal anchor rod, which was then pulled out from the side closest to the first transfer section.

[0018] Furthermore, during the construction phase of the first transfer section, the second horizontal anchor rod is a prestressed anchor rod. The second horizontal anchor rod includes a threaded section and an anchoring section. The threaded section passes through the anchor hole, and a washer is fitted on the threaded section and a nut is threadedly connected to it. The washer is attached to the surrounding rock outside the anchor hole. After prestress is applied to the second horizontal anchor rod, the nut is pressed against the washer. During the first tunnel construction phase, the underpass section was excavated downwards. After the anchoring section was excavated, the nuts on the threaded section were removed, and the second horizontal anchor rod was pulled out from the side closest to the underpass section.

[0019] Furthermore, the first section tunnel and transfer passage are equipped with foot anchors and radial system anchors.

[0020] This solution also has the following effects: 1. The surrounding rock between the first transfer section and the first tunnel section is reinforced by the first horizontal anchor bolt, thereby reducing the construction impact between the two tunnels; the surrounding rock between the first transfer section and the first underpass section is reinforced by the first horizontal anchor bolt, thereby reducing the disturbance to the surrounding rock of the first transfer section during the excavation of the first underpass section.

[0021] 2. By setting a second horizontal anchor bolt and controlling the anchorage section below the first tunnel section, it is ensured that the anchorage section can be excavated during the excavation of the underpass section below the first tunnel section, so that the anchor bolt can be directly removed from the anchor hole. This not only strengthens the second anchorage zone during the excavation stage below the first tunnel section, reducing the impact on the first transfer section and avoiding damage to the structural stability of the first transfer section, but also allows for easy removal of the second horizontal anchor bolt after the underpass section is excavated, reducing the strength of the second anchorage zone and facilitating rapid excavation of the second anchorage zone.

[0022] 3. Prestressed anchor bolts can provide the anchoring effect of a second horizontal anchor bolt. If a general anchor is used to fix the tensioning end, it will be difficult to remove the second horizontal anchor bolt later. However, for the nuts on the threaded section, plastic bags or foam need to be used to cover the threaded section and nuts in advance before the initial support shotcrete. Later, the fixation of the tensioning end can be released by rotation, so that the second horizontal anchor bolt can be removed.

[0023] 4. Use anchor bolts and system anchor bolts to strengthen the connection between the first section tunnel and the transfer passage and the surrounding rock, thereby increasing structural stability. Attached Figure Description

[0024] Figure 1 This is a top view of Example 1; Figure 2 for Figure 1 A schematic diagram of the AA-direction cross-section; Figure 3 for Figure 1 Schematic diagram of the BB-direction cross section; Figure 4 for Figure 1A schematic diagram of the CC-direction cross-section; Figure 5 for Figure 1 Schematic diagram of the DD-direction cross section; Figure 6 For along Figure 1 Cross-sectional view of the centerline of the floor-changing passage (combined) Figure 2 and Figure 4 get); Figure 7 for Figure 3 A schematic diagram of the construction phase of the corresponding first transfer section; Figure 8 for Figure 3 A schematic diagram of the corresponding first tunnel construction phase; Figure 9 for Figure 3 A schematic diagram of the construction phase of the second section of the tunnel; Figure 10 for Figure 2 A schematic diagram of the construction phase of the corresponding first transfer section; Figure 11 for Figure 2 A schematic diagram of the corresponding first tunnel construction phase; Figure 12 for Figure 11 A schematic diagram of the first section of the tunnel after the downward excavation and underpass section; Figure 13 for Figure 12 A schematic diagram of the underpass section and the first interchange section; Figure 14 for Figure 2 A schematic diagram of the construction phase of the second section of the tunnel; Figure 15 This is a cross-sectional schematic diagram of the second horizontal anchor rod in Example 2. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: upper platform 1, first tunnel section 11, second tunnel section 12, lower platform 2, third tunnel section 21, transfer passage 3, first transfer section 31, underpass section 32, second transfer section 33, support plate 34, first ring beam 35, second ring beam 36, first horizontal anchor bolt 37, horizontal anchor bolt 38, system anchor bolt 41, locking foot anchor bolt 42, anchor hole 51, gasket 52, nut 53, partition 54, threaded section 55, sliding section 56, anchoring section 57, grouting hole 58, liquid outlet 59, first anchoring zone 61, second anchoring zone 62, mortar 7.

[0026] Example 1 Example 1 is basically as follows Figures 1-14As shown in the figure, cross-sectional lines are omitted: an L-shaped intersecting subway transfer passage structure, including upper platform 1 and lower platform 2, as shown... Figure 1 As shown, the centerlines of the upper platform 1 and the lower platform 2 are perpendicular to each other, as... Figure 2 As shown, the lower platform 2 is located to the right and below the upper platform 1. The upper platform 1 has a first section tunnel on its right side and a second section tunnel on its left side. The lower platform has two third section tunnels. In this embodiment 1, all section tunnels are tunnels for subway passage.

[0027] It also includes transfer corridor 3, such as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the transfer passage 3 includes a first transfer section 31, an underpass section 32, and a second transfer section 33 connected in sequence. Both the first transfer section 31 and the second transfer section 33 are inclined downwards. The first transfer section 31 is connected to the end of the upper platform 1. The underpass section 32 is perpendicular to the first transfer section 31 in the horizontal direction. The underpass section 32 passes under the first section tunnel and is formed by excavating downwards from the first section tunnel. A support plate 34 is provided between the underpass section 32 and the first section tunnel.

[0028] Construction of the first transfer section 31, the first section tunnel, the underpass section 32, and the second section tunnel began sequentially. Therefore, the structure of this embodiment 1 is also divided into four structural states according to the four construction stages. In this embodiment 1, the support plate 34 is a reinforced concrete structure, which is poured last after the construction of the second section tunnel is completed. The strength of the support plate 34 is designed according to the actual situation, and steel sections and other supporting components are added as needed. Locking anchor bolts 42 and radial system anchor bolts 41 are provided on both the first section tunnel and the transfer passage 3. This is existing technology and will not be described in detail.

[0029] The first transfer section, phase 31 of construction, such as Figure 7 As shown, a first anchorage zone 61 is provided on the right side of the first transfer section 31. The first anchorage zone 61 includes the tunnel section of the first section on the side wall of the first transfer section 31, as shown in the figure. Figure 4 The side projection area is shown. The side projection area refers to the area projected onto the sidewall of the first transfer section 31 along a direction perpendicular to the centerline of the first transfer section 31. Several first horizontal anchor bolts 37 are installed within the first anchorage area 61. All first horizontal anchor bolts 37 horizontally penetrate the excavation outline of the first section tunnel, and the lengths of the first horizontal anchor bolts 37 penetrating the excavation outline of the first section tunnel are the same. Since the sidewall of the first transfer section 31 slopes downwards, the first anchorage area 61 is as follows: Figure 4 The triangular region shown.

[0030] The first transfer section, phase 31 of construction, such as Figure 10As shown, the connection point between the first transfer section 31 and the connecting underpass section 32 is as follows: Figure 4 The second anchoring zone 62 shown has several anchor holes 51 drilled within it. Several second horizontal anchor rods 38 are installed within each anchor hole 51. Each second horizontal anchor rod 38 includes an anchoring section 57 located below the first tunnel section. The anchoring section 57 is formed by: inserting the anchoring agent into the bottom of the anchor hole 51 using the second horizontal anchor rod 38; then inserting the second horizontal anchor rod 38 into the anchor hole 51, with its end inserted into the anchoring agent, thus anchoring to the surrounding rock to form the anchoring section 57. The rod body portion outside the anchoring section 57 is slidably connected to the anchor hole 51. The second anchorage zone 62 is near the first transfer section 31 and a first ring beam 35 is poured. The first ring beam 35 is a reinforced concrete structure and surrounds the second anchorage zone 62. During the first tunnel construction phase, such as Figure 8 As shown, based on the length of the first horizontal anchor bolt 37 exposed during excavation, it is determined whether over-excavation has occurred, and the excavation volume is controlled in a timely manner until the excavation reaches the specified depth. Figure 11 The location shown; like Figure 12 As shown, in the 32nd construction stage of the underpass section, excavation begins downwards from the corresponding position of the first tunnel section, as follows: Figure 13 As shown, a second ring beam 36 is poured on the side of the second anchorage zone 62 near the first tunnel section. The second ring beam 36 is a reinforced concrete structure and surrounds the second anchorage zone 62. Then, the surrounding rock anchored by the anchorage section 57 of the second horizontal anchor rod 38 is destroyed, and the second horizontal anchor rod 38 is pulled out from the side near the first transfer section 31. Finally, the surrounding rock within the range of the second anchorage zone 62 is broken, thereby connecting the first transfer section 31 and the underpass section 32.

[0031] The second tunnel construction phase, as follows Figure 9 , Figure 14 As shown, the second section tunnel will be constructed after the first transfer section 31, the first section tunnel and the underpass section 32 have been completed and the lining has been poured and stabilized.

[0032] During construction, the most dangerous time is when the original surrounding rock is damaged at the beginning of the excavation, which poses a greater risk of collapse. After the initial support and lining are installed after the excavation, the risk of collapse is not a major concern. Therefore, this embodiment mainly focuses on structural reinforcement during the excavation process.

[0033] Example 2 The difference between Example 2 and Example 1 is that in the construction stage of the first transfer section 31, the second horizontal anchor 38 is a prestressed anchor, such as... Figure 15As shown, the second horizontal anchor 38 sequentially includes an integrally formed threaded section 55, a sliding section 56, and an anchoring section 57. The sliding section 56 is slidably connected to the anchor hole 51. A grouting hole 58 is provided inside the second horizontal anchor 38. The inlet of the grouting hole 58 is located at the end of the threaded section 55, and several outlets 59 of the grouting hole 58 are located in the anchoring section 57. A partition 54 is provided between the sliding section 56 and the anchoring section 57. The partition 54 is conical, with the conical surface facing the side where the anchoring section 57 is located, and it is clearance-fitted with the anchor hole 51. The threaded section 55 extends out of the anchor hole 51. The upper part is fitted with a washer 52 and threaded with a nut 53. The washer 52 is attached to the surrounding rock outside the anchor hole 51. After the second horizontal anchor rod 38 is tensioned and prestressed, the nut 53 presses against the washer 52. Then, mortar 7 is injected into the anchoring section 57 through the inlet. By adjusting the viscosity of the mortar 7, the amount of mortar 7 flowing out from between the partition 54 and the anchor hole 51 is reduced, thereby anchoring the anchoring section 57 to the surrounding rock. Before the surrounding rock of the first transfer section 31 is reinforced with shotcrete, the threaded section 55 is wrapped with foam or geotextile to prevent the shotcrete from covering the surface of the threaded section 55.

[0034] During the first tunnel construction phase, the underpass section 32 is excavated downwards. After the anchoring section 57 is excavated, the nut 53 on the threaded section 55 is rotated and removed. The second horizontal anchor rod 38 is then pulled out from the side closest to the underpass section 32.

[0035] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An L-shaped intersecting subway transfer passage structure, comprising an upper platform and a lower platform, wherein a first section tunnel is provided on the side of the upper platform closest to the lower platform, characterized in that: It also includes a transfer passage, which consists of a first transfer section, an underpass section, and a second transfer section connected in sequence. Both the first and second transfer sections are inclined downwards. The first transfer section is connected to the end of the upper platform. The underpass section is perpendicular to the first transfer section in the horizontal direction. The underpass section passes under the first section tunnel and is formed by excavating downwards from the first section tunnel. A support plate is provided between the underpass section and the first section tunnel.

2. The L-shaped intersecting subway transfer passage structure according to claim 1, characterized in that: The first transfer section, the first section tunnel, and the underpass section were constructed in sequence. During the construction phase of the first transfer section, a first anchorage zone is set up on the side of the first transfer section near the first section tunnel. The first anchorage zone includes the side projection area of ​​the first section tunnel on the side wall of the first transfer section. Several first horizontal anchors are set up in the first anchorage zone, and all the first horizontal anchors penetrate into the excavation outline of the first section tunnel.

3. The L-shaped intersecting subway transfer passage structure according to claim 2, characterized in that: Several first horizontal anchor bolts have the same length when they penetrate the excavation profile of the first section of the tunnel.

4. The L-shaped intersecting subway transfer passage structure according to claim 2, characterized in that: During the construction phase of the first transfer section, the connection point between the first transfer section and the underpass section is the second anchorage zone. Several second horizontal anchors are installed in the second anchorage zone, and the ends of the second horizontal anchors are located below the first section tunnel.

5. The L-shaped intersecting subway transfer passage structure according to claim 4, characterized in that: During the construction phase of the first transfer section, a first ring beam is installed on the side of the second anchorage zone closest to the first transfer section, and the first ring beam surrounds the second anchorage zone. During the construction phase of the first tunnel section, after the downward excavation of the underpass section, a second ring beam is installed on the side of the second anchorage zone near the first tunnel section. The second ring beam surrounds the corresponding area of ​​the second anchorage zone of the underpass section.

6. The L-shaped intersecting subway transfer passage structure according to claim 2, characterized in that: During the first tunnel construction phase, the surrounding rock and the second horizontal anchor bolt in the second anchorage zone were removed.

7. The L-shaped intersecting subway transfer passage structure according to claim 6, characterized in that: During the construction phase of the first transfer section, anchor holes are provided in the second anchoring zone, and second horizontal anchor rods are installed in the anchor holes. The second horizontal anchor rod includes an anchoring section, which is located below the tunnel of the first section. The part of the rod outside the anchoring section is slidably connected to the inner wall of the anchor hole. During the construction phase of the first tunnel section, the downward excavation of the underpass section damaged the anchorage section of the second horizontal anchor rod, which was then pulled out from the side closest to the first transfer section.

8. The L-shaped intersecting subway transfer passage structure according to claim 6, characterized in that: During the construction phase of the first transfer section, the second horizontal anchor is a prestressed anchor. The second horizontal anchor includes a threaded section and an anchoring section. The threaded section passes through the anchor hole, and a washer is fitted on the threaded section and a nut is threadedly connected to it. The washer is attached to the surrounding rock outside the anchor hole. After prestress is applied to the second horizontal anchor, the nut is pressed against the washer. During the first tunnel construction phase, the underpass section was excavated downwards. After the anchoring section was excavated, the nuts on the threaded section were removed, and the second horizontal anchor rod was pulled out from the side closest to the underpass section.

9. The L-shaped intersecting subway transfer passage structure according to claim 1, characterized in that: Both the first section tunnel and the transfer passage are equipped with foot anchors and radial system anchors.

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