A subway station constructed by underground excavation

Abstract

A subway open cut station comprises a left tunnel ring prefabricated bottom pipe piece, a right tunnel ring prefabricated bottom pipe piece, a left tunnel ring prefabricated side pipe piece, a right tunnel ring prefabricated side pipe piece, a left tunnel ring prefabricated top pipe piece, a right tunnel ring prefabricated top pipe piece, a bottom post-cast U-shaped beam, a top post-cast U-shaped beam and permanent columns; the bottom post-cast U-shaped beam is fixed on the upper part of the left tunnel ring prefabricated bottom pipe piece and the right tunnel ring prefabricated bottom pipe piece, and the left tunnel ring prefabricated bottom pipe piece and the right tunnel ring prefabricated bottom pipe piece are firmly connected; the top post-cast U-shaped beam is fixed on the lower part of the left tunnel ring prefabricated top pipe piece and the right tunnel ring prefabricated top pipe piece, and the left tunnel ring prefabricated top pipe piece and the right tunnel ring prefabricated top pipe piece are firmly connected; and the permanent columns are fixed between the bottom post-cast U-shaped beam and the top post-cast U-shaped beam at intervals. The subway open cut station has large space size and stable structure.

Description

Technical Field

[0001] This invention relates to a tunnel construction technology. Background Technology

[0002] The cut-and-cover construction of large-section rectangular tunnels is a novel technique with no prior engineering experience in China. There is currently no technical solution to the problem of insufficient rigidity and inter-loop connections at pipeline junctions during cut-and-cover construction to form a structural system with the supporting columns. Therefore, subway stations built using existing techniques have limited space and cannot meet the required standards. Summary of the Invention

[0003] The technical problem to be solved by this invention is that the space of subway stations built with existing technology is relatively small. Therefore, a subway underground tunnel station is proposed, which not only has a large space size, but also has a stable structure.

[0004] To solve the above-mentioned technical problems, the present invention proposes the following technical solution: a subway tunneling station, comprising several left tunnel ring precast bottom segments installed side by side, several right tunnel ring precast bottom segments installed side by side on the right side of several left tunnel ring precast bottom segments, several left tunnel ring precast side segments vertically fixed side by side on the left end of several left tunnel ring precast bottom segments, several right tunnel ring precast side segments vertically fixed side by side on the right end of several right tunnel ring precast bottom segments, several left tunnel ring precast top segments fixed side by side on the top of several left tunnel ring precast side segments, several right tunnel ring precast top segments fixed side by side on the top of several right tunnel ring precast side segments, a bottom post-cast U-shaped beam, a top post-cast U-shaped beam, and several permanent columns; A bottom left fixing block protrudes upward from the right end of the precast bottom segment of the left tunnel ring, and a bottom right fixing block protrudes upward from the left end of the precast bottom segment of the right tunnel ring. A top left fixing block protrudes downward from the right end of the precast jacking segment of the left tunnel ring, and a top right fixing block protrudes downward from the left end of the precast jacking segment of the right tunnel ring. The bottom post-cast U-shaped beam is fixed on the upper part of several left tunnel ring precast bottom segments and several right tunnel ring precast bottom segments. The left end of the bottom post-cast U-shaped beam presses against the left side of the bottom left fixed block, and its right end presses against the right side of the bottom right fixed block, thus firmly connecting the left tunnel ring precast bottom segments and the right tunnel ring precast bottom segments. The top post-cast U-shaped beam is fixed to the lower part of several left tunnel ring precast jacking segments and several right tunnel ring precast jacking segments. The left end of the top post-cast U-shaped beam presses against the left side of the top left fixed block, and its right end presses against the right side of the top right fixed block, thus firmly connecting the left tunnel ring precast jacking segments and the right tunnel ring precast jacking segments. Several permanent columns are fixed at intervals between the bottom and top post-cast U-shaped beams.

[0005] A further limitation of the above technical solution is that the bottom post-cast U-shaped beam includes a steel plate encasing the bottom U-shaped beam and bottom post-cast concrete; The bottom U-shaped beam is wrapped with steel plates in an inverted U-shape. Its left and right ends are respectively installed and fixed on the top wall of the precast bottom segment of the left tunnel ring and the top wall of the precast bottom segment of the right tunnel ring. The protruding part in the middle is suspended above the bottom left fixing block and the bottom right fixing block. The bottom post-cast concrete is poured between the steel plate encasing the bottom U-shaped beam and the precast bottom segments of the left and right tunnel rings.

[0006] A further limitation of the above technical solution is that the bottom post-cast U-shaped beam also includes a bottom U-shaped beam reinforcement cage, which is installed between the outer steel plate of the bottom U-shaped beam and the precast bottom segments of the left tunnel ring and the right tunnel ring. Bottom left anchor bars are pre-embedded on the top of the bottom left fixing block and the top of the pipe segment to its left, bottom right anchor bars are pre-embedded on the top of the bottom right fixing block and the top of the pipe segment to its right, and bottom outer steel plate anchors extending downward are provided on the top wall of the bottom U-shaped beam outer steel plate. The bottom U-shaped beam is encased in a steel plate that covers the bottom left and bottom right anchor bars. The bottom left and bottom right anchor bars and the bottom outer steel plate anchors all extend into the bottom U-shaped beam reinforcement cage. The bottom left and bottom right anchor bars and the bottom outer steel plate anchors all extend into and are cast and fixed into the bottom post-poured concrete.

[0007] A further limitation of the above technical solution is that the top post-cast U-shaped beam includes a steel plate encasing the top U-shaped beam and top post-cast concrete; The top U-shaped beam is wrapped with steel plates in the shape of a U. Its left and right ends are respectively installed and fixed on the bottom wall of the precast jacking segment of the left tunnel ring and the bottom wall of the precast jacking segment of the right tunnel ring. The protruding part in the middle is suspended below the top left fixing block and the top right fixing block. The top post-cast concrete was poured between the steel plate encasing the top U-shaped beam and the precast jacking segments of the left and right tunnel rings.

[0008] A further limitation of the above technical solution is that the top post-cast U-shaped beam also includes a top U-shaped beam reinforcement cage, which is installed between the outer steel plate of the top U-shaped beam and the precast jacking segments of the left tunnel ring and the precast jacking segments of the right tunnel ring. Top left anchor bars are pre-embedded at the bottom of the top left fixing block and the bottom of the segment to its left, and top right anchor bars are pre-embedded at the bottom of the top right fixing block and the bottom of the segment to its right. The bottom wall of the steel plate covering the top U-shaped beam is provided with upward-extending top outer steel plate anchor nails. The steel plate encasing the top U-shaped beam covers the top left and top right anchor bars. The top left and top right anchor bars and the anchors of the top outer steel plate all extend into the reinforcement cage of the top U-shaped beam. The top left and top right anchor bars and the anchors of the top outer steel plate all extend into and are cast and fixed into the top post-poured concrete.

[0009] A further limitation of the above technical solution is that the subway tunnel station also includes several bottom post-cast steel-concrete beams respectively cast at the right end of the precast bottom segment of the left tunnel ring and the left end of the precast bottom segment of the right tunnel ring.

[0010] A further limitation of the above technical solution is that a bottom working hole is opened in the bottom left fixing block and the bottom right fixing block respectively, and a bottom working hole reserved steel plate is fixed in close contact with the inner wall of the bottom working hole; The bottom post-cast steel-concrete beam includes an I-beam located in the bottom working hole and post-cast concrete poured between the I-beam and the reserved steel plate in the bottom working hole.

[0011] A further limitation of the above technical solution is that the subway tunnel station also includes several post-cast steel-concrete composite beams cast on the top of the precast jacking segments of the left tunnel ring and the left end of the precast jacking segments of the right tunnel ring, respectively.

[0012] A further limitation of the above technical solution is that a top working hole is opened in the top left fixing block and the top right fixing block respectively, and a top working hole reserved steel plate is fixed in close contact with the inner wall of the top working hole; The top post-cast steel-concrete composite beam includes an I-beam located in the top working hole and post-cast concrete poured between the I-beam and the reserved steel plate in the top working hole.

[0013] A further limitation of the above technical solution is that the subway tunnel station also includes an inter-layer beam-slab system, which is fixed between the middle of several left tunnel ring precast side segments and the middle of several right tunnel ring precast side segments, and several permanent columns pass vertically through the inter-layer beam-slab system.

[0014] Compared with existing technologies, this invention has the following advantages: The bottom post-cast U-shaped beam firmly connects the precast bottom segments of the left and right tunnel rings. The top post-cast U-shaped beam firmly connects the precast top segments of the left and right tunnel rings. Several permanent columns are evenly spaced and fixed between the bottom and top post-cast U-shaped beams, providing support. This invention provides a large spatial dimension for subway tunnel stations constructed using the cut-and-cover method, and also offers structural stability. Attached Figure Description

[0015] Figure 1This is a cross-sectional view of the subway tunnel station of the present invention (cross-section at the location of permanent columns).

[0016] Figure 2 This is a cross-sectional view of the subway tunnel station of the present invention (viewed in a location without permanent columns).

[0017] Figure 3 This is a magnified view of the combined state of the precast bottom segments of the left tunnel ring, the precast bottom segments of the right tunnel ring, the bottom post-cast steel-concrete beam, and the bottom post-cast U-shaped beam.

[0018] Figure 4 This is a magnified view of the combined state of the precast jacking segments of the left tunnel ring, the precast jacking segments of the right tunnel ring, the post-cast steel-concrete composite beam at the top, and the post-cast U-shaped beam at the top.

[0019] Figure 5 This is a cross-sectional view of the precast bottom segment of the left tunnel ring.

[0020] Figure 6 This is a cross-sectional view of the precast bottom segment of the right tunnel ring.

[0021] Figure 7 This is a cross-sectional view of the precast jacking segments of the left tunnel ring.

[0022] Figure 8 This is a cross-sectional view of the precast jacking segments of the right tunnel ring.

[0023] Figure 9 This is a sectional view of the bottom post-cast U-shaped beam.

[0024] Figure 10 This is a sectional view of the top post-cast U-shaped beam. Detailed Implementation

[0025] Please see Figures 1 to 10 A type of subway tunnel station includes several precast bottom segments 1 of the left tunnel ring installed side by side, several precast bottom segments 2 of the right tunnel ring installed side by side on the right side of the precast bottom segments 1 of the left tunnel ring, several precast side segments 3 of the left tunnel ring installed side by side vertically fixed to the left end of the precast bottom segments 1 of the left tunnel ring, several precast side segments 4 of the right tunnel ring installed side by side vertically fixed to the right end of the precast bottom segments 2 of the right tunnel ring, several precast top segments 5 of the left tunnel ring installed side by side on top of the precast side segments 3 of the left tunnel ring, several precast top segments 6 of the right tunnel ring installed side by side on top of the precast side segments 4 of the right tunnel ring, two bottom post-cast steel-concrete beams 7, bottom post-cast U-shaped beams 8, two top post-cast steel-concrete beams 9, top post-cast U-shaped beams 10, several permanent columns 11, and an inter-story beam-slab system 12.

[0026] The precast bottom segment 2 of the right tunnel ring is installed and fixed right next to the precast bottom segment 1 of the left tunnel ring.

[0027] A lower joint 101 is left between the precast bottom segment 1 of the left tunnel ring and the precast bottom segment 2 of the right tunnel ring, and epoxy resin 103 for waterproofing is provided in the lower joint 101.

[0028] The right end of the precast bottom segment 1 of the left tunnel ring is provided with a bottom left fixing block 105 protruding upward. Bottom left anchor bars 107 are pre-embedded on the top of the bottom left fixing block 105 and the top of the segment to its left.

[0029] A bottom right fixing block 201 is provided on the left end of the precast bottom segment 2 of the right tunnel ring. Bottom right anchor bars 203 are pre-embedded on the top of the bottom right fixing block 201 and the top of the segment to its right.

[0030] A bottom working hole 109 is opened in the bottom left fixing block 105 of the left tunnel ring precast bottom segment 1 and the bottom right fixing block 201 of the right tunnel ring precast bottom segment 2, respectively, and a bottom working hole reserved steel plate 111 is fixed in close to the inner wall of the bottom working hole 109.

[0031] The precast jacking segment 6 of the right tunnel ring is installed and fixed to the right side of the precast jacking segment 5 of the left tunnel ring.

[0032] An upper joint 51 is left between the precast jacking segment 5 of the left tunnel ring and the precast jacking segment 6 of the right tunnel ring. The upper joint 51 is filled with epoxy resin 512 for waterproofing.

[0033] The right end of the precast jacking segment 5 of the left tunnel ring is provided with a top left fixing block 501 protruding downward. The bottom of the top left fixing block 501 and the bottom of the segment to its left are both pre-embedded with top left anchor bars 503.

[0034] The left end of the precast jacking segment 6 of the right tunnel ring is provided with a top right fixing block 601 protruding downward. The bottom of the top right fixing block 601 and the bottom of the segment to its right are both pre-embedded with top right anchor bars 603.

[0035] A top working hole 505 is opened in the top left fixing block 501 of the left tunnel ring precast jacking segment 5 and the top right fixing block 601 of the right tunnel ring precast jacking segment 6, respectively, and a top working hole reserved steel plate 507 is fixed in close contact with the inner wall of the top working hole 505.

[0036] Two bottom-cast steel-concrete composite beams 7 were respectively cast at the right end of the precast bottom segment 1 of the left tunnel ring and the left end of the precast bottom segment 2 of the right tunnel ring.

[0037] Each bottom post-cast steel-concrete beam 7 includes an I-beam 72 located in the bottom working hole 109 and post-cast concrete 74 poured between the I-beam 72 and the reserved steel plate 111 of the bottom working hole.

[0038] The length of the I-beam 72 is the width of the 10 rings of the precast bottom segment 1 of the left tunnel ring (for ease of construction, the widths of the precast bottom segment 1, the precast bottom segment 2, the precast side segment 3, the precast side segment 4, the precast top segment 5, and the precast top segment 6 of the left tunnel ring are all the same).

[0039] The post-cast concrete 74 is used to cast and fix the two bottom post-cast steel-concrete beams 7 into the bottom working holes 109 of the precast bottom segment 1 of the left tunnel ring and the bottom working holes 109 of the precast bottom segment 2 of the right tunnel ring.

[0040] The bottom post-cast U-shaped beam 8 firmly connects the precast bottom segment 1 of the left tunnel ring and the precast bottom segment 2 of the right tunnel ring.

[0041] The bottom post-cast U-shaped beam 8 includes a steel plate 81 encasing the bottom U-shaped beam, a steel cage 82 for the bottom U-shaped beam, and bottom post-cast concrete 83.

[0042] The bottom U-shaped beam is wrapped with steel plate 81 in the shape of an inverted U. Its left and right ends are respectively installed and fixed on the top wall of the left tunnel ring precast bottom segment 1 and the top wall of the right tunnel ring precast bottom segment 2. The middle protruding part is suspended above the bottom left fixing block 105 and the bottom right fixing block 201.

[0043] The bottom U-shaped beam is encased in a steel plate 81, which covers the bottom left anchor bar 107 and the bottom right anchor bar 203.

[0044] The bottom U-shaped beam is provided with bottom outer steel plate anchors 812 extending downward on the top wall of the outer steel plate 81.

[0045] The bottom U-shaped beam reinforcement cage 82 is installed between the bottom U-shaped beam outer steel plate 81 and the left tunnel ring precast bottom segment 1 and the right tunnel ring precast bottom segment 2.

[0046] The bottom left anchor bar 107, the bottom right anchor bar 203, and the bottom outer steel plate anchor nail 812 all extend into the bottom U-shaped beam reinforcement cage 82.

[0047] The bottom post-cast concrete 83 is poured between the bottom U-shaped beam outer steel plate 81 and the left tunnel ring precast bottom segment 1 and the right tunnel ring precast bottom segment 2. The bottom left anchor bar 107, the bottom right anchor bar 203 and the bottom outer steel plate anchor nail 812 all extend into and are poured and fixed into the bottom post-cast concrete 83.

[0048] With the combined action of the bottom left anchor bar 107, bottom right anchor bar 203, bottom outer steel plate anchor nail 812, bottom U-shaped beam reinforcement cage 82, and bottom post-cast concrete 83, the bottom post-cast U-shaped beam 8 is firmly cast and fixed to the upper part of the left tunnel ring precast bottom segment 1 and the right tunnel ring precast bottom segment 2. The left end of the bottom post-cast U-shaped beam 8 presses against the left side of the bottom left fixing block 105, and its right end presses against the right side of the bottom right fixing block 201, thereby firmly connecting the left tunnel ring precast bottom segment 1 and the right tunnel ring precast bottom segment 2. The two bottom post-cast steel-concrete beams 7 cast and fixed to the right end of the left tunnel ring precast bottom segment 1 and the left end of the right tunnel ring precast bottom segment 2 can greatly increase the strength and rigidity.

[0049] Two post-cast steel-concrete composite beams 9 were cast at the right end of the precast jacking segment 5 of the left tunnel ring and the left end of the precast jacking segment 6 of the right tunnel ring, respectively.

[0050] Each top post-cast steel-concrete beam 9 includes an I-beam 92 located in the top working hole 505 and post-cast concrete 94 poured between the I-beam 92 and the reserved steel plate 507 of the top working hole.

[0051] The length of the I-beam 92 is the width of the 10 rings of the precast jacking segment 5 of the left tunnel ring (for ease of construction, the widths of the precast bottom segment 1, the precast bottom segment 2, the precast side segment 3, the precast side segment 4, the precast jacking segment 5, and the precast jacking segment 6 of the left tunnel ring are all the same).

[0052] Two top post-cast steel-concrete beams 9 are cast into the top working holes 505 of the precast jacking segment 5 in the left tunnel ring and the top working holes 505 of the precast jacking segment 6 in the right tunnel ring by post-cast concrete 94.

[0053] The top post-cast U-shaped beam 10 firmly connects the precast jacking segments 5 of the left tunnel ring and the precast jacking segments 6 of the right tunnel ring.

[0054] The top post-cast U-shaped beam 10 includes a steel plate 1001 encasing the top U-shaped beam, a steel reinforcement cage 1002 for the top U-shaped beam, and top post-cast concrete 1003.

[0055] The top U-shaped beam is wrapped with a steel plate 1001 in the shape of a U. Its left and right ends are respectively installed and fixed on the bottom wall of the left tunnel ring precast jacking segment 5 and the bottom wall of the right tunnel ring precast jacking segment 6. The middle protruding part is suspended below the top left fixing block 501 and the top right fixing block 601.

[0056] The top U-shaped beam is encased in a steel plate 1001, which covers the top left anchor bar 503 and the top right anchor bar 603.

[0057] The bottom wall of the top U-shaped beam outer steel plate 1001 is provided with upward-extending top outer steel plate anchors 1012.

[0058] The top U-shaped beam reinforcement cage 1002 is installed between the top U-shaped beam outer steel plate 1001 and the left tunnel ring precast jacking segment 5 and the right tunnel ring precast jacking segment 6.

[0059] The top left anchor bar 503, the top right anchor bar 603, and the top outer steel plate anchor nail 1012 all extend into the top U-shaped beam reinforcement cage 1002.

[0060] The top post-cast concrete 1003 is poured between the steel plate 1001 encasing the top U-shaped beam and the precast jacking segments 5 and 6 of the left and right tunnel rings. The top left anchor bar 503, the top right anchor bar 603, and the top outer steel plate anchor nail 1012 all extend into and are poured and fixed inside the top post-cast concrete 1003.

[0061] With the combined action of the top left anchor bar 503, the top right anchor bar 603, the top outer steel plate anchor nail 1012, the top U-shaped beam reinforcement cage 1002, and the top post-cast concrete 1003, the top post-cast U-shaped beam 10 is firmly cast and fixed to the lower part of the left tunnel ring precast jacking segment 5 and the right tunnel ring precast jacking segment 6. The left end of the top post-cast U-shaped beam 10 presses against the left side of the top left fixing block 501, and its right end presses against the right side of the top right fixing block 601, thereby firmly connecting the left tunnel ring precast jacking segment 5 and the right tunnel ring precast jacking segment 6. The two top post-cast steel-concrete beams 9 cast and fixed to the right end of the left tunnel ring precast jacking segment 5 and the left end of the right tunnel ring precast jacking segment 6 can greatly increase the strength and rigidity.

[0062] Several permanent columns 11 are fixed at equal intervals between the bottom post-cast U-shaped beam 8 and the top post-cast U-shaped beam 10 to provide support.

[0063] The inter-layer beam-slab system 12 is installed and fixed between the middle of several left tunnel ring precast side segments 3 and several right tunnel ring precast side segments 4. The inter-layer beam-slab system 12 is parallel to the left tunnel ring precast bottom segments 1 and the right tunnel ring precast bottom segments 2. Several permanent columns 11 pass through the inter-layer beam-slab system 12.

[0064] The present invention has the following beneficial effects: The bottom post-cast U-shaped beam 8 firmly connects the precast bottom segment 1 and the precast bottom segment 2 of the left tunnel ring. The top post-cast U-shaped beam 10 firmly connects the precast top segment 5 and the precast top segment 6 of the left tunnel ring. Several permanent columns 11 are fixed at equal intervals between the bottom post-cast U-shaped beam 8 and the top post-cast U-shaped beam 10, providing support. The present invention provides a large spatial dimension for subway tunnel stations constructed using the cut-and-cover method, and also features a stable structure.

Claims

1. A type of subway station constructed by cutting and unloading, characterized in that, It includes several left tunnel ring precast bottom segments (1) installed side by side, several right tunnel ring precast bottom segments (2) installed side by side on the right side of several left tunnel ring precast bottom segments (1), several left tunnel ring precast side segments (3) installed side by side vertically fixed to the left end of several left tunnel ring precast bottom segments (1), several right tunnel ring precast side segments (4) installed side by side vertically fixed to the right end of several right tunnel ring precast bottom segments (2), several left tunnel ring precast top segments (5) installed side by side on the top of several left tunnel ring precast side segments (3), several right tunnel ring precast top segments (6) installed side by side on the top of several right tunnel ring precast side segments (4), bottom post-cast U-shaped beam (8), top post-cast U-shaped beam (10), and several permanent columns (11). A bottom left fixing block (105) protrudes upward from the right end of the precast bottom segment (1) of the left tunnel ring, and a bottom right fixing block (201) protrudes upward from the left end of the precast bottom segment (2) of the right tunnel ring. A top left fixing block (501) protrudes downward from the right end of the precast jacking segment (5) of the left tunnel ring, and a top right fixing block (601) protrudes downward from the left end of the precast jacking segment (6) of the right tunnel ring. The bottom post-cast U-shaped beam (8) is fixed on the upper part of several left tunnel ring precast bottom segments (1) and several right tunnel ring precast bottom segments (2). The left end of the bottom post-cast U-shaped beam (8) presses against the left side of the bottom left fixing block (105), and its right end presses against the right side of the bottom right fixing block (201), thus firmly connecting the left tunnel ring precast bottom segments (1) and the right tunnel ring precast bottom segments (2). The top post-cast U-shaped beam (10) is fixed to the lower part of several left tunnel ring precast jacking segments (5) and several right tunnel ring precast jacking segments (6). The left end of the top post-cast U-shaped beam (10) presses against the left side of the top left fixing block (501), and its right end presses against the right side of the top right fixing block (601), thus firmly connecting the left tunnel ring precast jacking segments (5) and the right tunnel ring precast jacking segments (6). Several permanent columns (11) are fixed at intervals between the bottom post-cast U-beam (8) and the top post-cast U-beam (10).

2. The subway tunnel station according to claim 1, characterized in that, The bottom post-cast U-shaped beam (8) includes a steel plate (81) encased in the bottom U-shaped beam and bottom post-cast concrete (83). The bottom U-shaped beam is wrapped with a steel plate (81) in the shape of an inverted U. Its left and right ends are respectively installed and fixed on the top wall of the left tunnel ring precast bottom segment (1) and the top wall of the right tunnel ring precast bottom segment (2). The middle protruding part is suspended above the bottom left fixing block (105) and the bottom right fixing block (201). The bottom post-cast concrete (83) is poured between the steel plate (81) encased in the bottom U-shaped beam and the precast bottom segments (1) of the left tunnel ring and the precast bottom segments (2) of the right tunnel ring.

3. The subway tunnel station according to claim 2, characterized in that, The bottom post-cast U-shaped beam (8) also includes a bottom U-shaped beam reinforcement cage (82), which is installed between the bottom U-shaped beam outer steel plate (81) and the left tunnel ring precast bottom segment (1) and the right tunnel ring precast bottom segment (2); Bottom left anchor bar (107) is pre-embedded on the top of the bottom left fixing block (105) and the top of the pipe segment on its left side. Bottom right anchor bar (203) is pre-embedded on the top of the bottom right fixing block (201) and the top of the pipe segment on its right side. Bottom outer steel plate anchor nail (812) extending downward is provided on the top wall of the bottom U-shaped beam outer steel plate (81). The bottom U-shaped beam is encased in a steel plate (81) which covers the bottom left anchor bar (107) and the bottom right anchor bar (203). The bottom left anchor bar (107), the bottom right anchor bar (203) and the bottom outer steel plate anchor nail (812) all extend into the bottom U-shaped beam reinforcement cage (82). The bottom left anchor bar (107), the bottom right anchor bar (203) and the bottom outer steel plate anchor nail (812) all extend into and are cast and fixed into the bottom post-cast concrete (83).

4. The subway station constructed by cutting and unloading as described in claim 1, characterized in that, The top post-cast U-shaped beam (10) includes a steel plate (1001) encased in the top U-shaped beam and top post-cast concrete (1003). The top U-shaped beam is wrapped with a steel plate (1001) in the shape of a U. Its left and right ends are respectively installed and fixed on the bottom wall of the left tunnel ring precast jacking segment (5) and the bottom wall of the right tunnel ring precast jacking segment (6). The middle protruding part is suspended below the top left fixing block (501) and the top right fixing block (601). The top post-cast concrete (1003) is poured between the steel plate (1001) of the top U-shaped beam and the precast jacking segments (5) of the left tunnel ring and the precast jacking segments (6) of the right tunnel ring.

5. The subway tunnel station according to claim 4, characterized in that, The top post-cast U-shaped beam (10) also includes a top U-shaped beam reinforcement cage (1002), which is installed between the top U-shaped beam outer steel plate (1001) and the left tunnel ring precast jacking segment (5) and the right tunnel ring precast jacking segment (6); Top left anchor bars (503) are pre-embedded at the bottom of the top left fixing block (501) and the bottom of the segment to its left, and top right anchor bars (603) are pre-embedded at the bottom of the top right fixing block (601) and the bottom of the segment to its right. Top outer steel plate anchors (1012) extending upward are provided on the bottom wall of the top U-shaped beam outer steel plate (1001). The top U-shaped beam is encased in a steel plate (1001) which covers the top left anchor bar (503) and the top right anchor bar (603). The top left anchor bar (503), the top right anchor bar (603) and the top outer steel plate anchor nail (1012) all extend into the top U-shaped beam reinforcement cage (1002). The top left anchor bar (503), the top right anchor bar (603) and the top outer steel plate anchor nail (1012) all extend into and are cast and fixed into the top post-poured concrete (1003).

6. The subway station constructed by cutting and unloading as described in claim 1, characterized in that, The subway tunnel station also includes several bottom cast-in-place steel-concrete beams (7) cast at the right end of the precast bottom segment (1) of the left tunnel ring and the left end of the precast bottom segment (2) of the right tunnel ring.

7. The subway tunnel station according to claim 6, characterized in that, A bottom working hole (109) is opened in the bottom left fixing block (105) and the bottom right fixing block (201), and a bottom working hole reserved steel plate (111) is fixed in close to the inner wall of the bottom working hole (109). The bottom post-cast steel-concrete beam (7) includes an I-beam (72) located in the bottom working hole (109) and post-cast concrete (74) poured between the I-beam (72) and the reserved steel plate (111) of the bottom working hole.

8. The subway station constructed by cutting and unloading as described in claim 1, characterized in that, The subway tunnel station also includes several cast-in-place steel-concrete beams (9) that are cast on the top of the precast jacking segments (5) of the left tunnel ring and the left end of the precast jacking segments (6) of the right tunnel ring.

9. The subway station constructed by cutting and unloading according to claim 8, characterized in that, A top working hole (505) is opened in the top left fixing block (501) and the top right fixing block (601), and a top working hole reserved steel plate (507) is fixed in close to the inner wall of the top working hole (505). The top post-cast steel-concrete beam (9) includes an I-beam (92) located in the top working hole (505) and post-cast concrete (94) poured between the I-beam (92) and the reserved steel plate (507) of the top working hole.

10. The subway station constructed by cutting and unloading as described in claim 1, characterized in that, The subway tunnel station also includes an inter-layer beam-slab system (12), which is fixed between the middle of several left tunnel ring precast side segments (3) and the middle of several right tunnel ring precast side segments (4), and several permanent columns (11) pass vertically through the inter-layer beam-slab system (12).

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