Arched non-column open-cut subway station shield unearthing structure and construction method thereof

Abstract

The invention discloses an arched non-column open-cut subway station shield unearthed structure, and relates to the technical field of subway station construction, is applied to a non-column station, and comprises a ground, a station body is arranged below the ground, the station body comprises a base, a middle plate layer and a top plate layer, the base comprises a bottom plate, a transportation rail is arranged on the bottom plate, and the middle plate layer and the top plate layer are arranged on the bottom plate. Three unearthing structures are arranged on the middle plate layer, the top plate layer is constructed after station unearthing is finished, waterproof structures are arranged on top plates of the three unearthing structures, and by means of the scheme, the three unearthing structures enable the unearthing efficiency to be improved and adapt to shield unearthing of the arched non-column open cut subway station; the construction difficulty is reduced, the trouble of adding temporary support and secondary dismantling is avoided, the resistance effect of an existing structure on side soil pressure is improved, the construction efficiency and the unearthing efficiency are improved, the structural integrity is guaranteed, and a station can stably run for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of subway station construction, and in particular to an arched column-free open-cut subway station shield excavation structure and a construction method thereof. Background Art

[0002] Open-cut arched column-free stations are gradually becoming the preferred choice for rail transit construction due to their unique structural advantages and efficient space utilization. However, in the construction of shield-driven starting stations or double-starting stations, how to reasonably set excavation holes in the arched column-free stations to meet the requirements of structural stress and ensure the quality of subsequent hole sealing construction and station waterproofing construction is a difficult problem faced by the structural design of open-cut arched column-free stations. Therefore, the present invention provides an arched column-free open-cut subway station shield excavation structure and a construction method thereof. Summary of the invention

[0003] In view of the above technical problems, the present invention discloses an arched column-free open-cut subway station shield excavation structure, which is applied in a column-free station and includes a ground, below which is arranged a station body, the station body including a base, a middle plate layer and a top plate layer, the base including a bottom plate, on which a transport track is arranged, three excavation structures are arranged on the middle plate layer, the top plate layer is constructed after the excavation of the station is completed, and the top plates of the three excavation structures are all provided with waterproof structures. Through the above scheme, the three excavation structures improve the excavation efficiency and adapt to the shield excavation of the arched column-free open-cut subway station.

[0004] Furthermore, the station body also includes bilaterally symmetrical retaining structures, a cap beam is arranged at the top of the retaining structure, and the bottom plate, middle plate layer and top plate layer are all arranged between the bilaterally symmetrical retaining structures. Through the above scheme, the excavation efficiency is improved, and the structural advantages and space utilization of the open-cut arch column-free station are maximized.

[0005] Furthermore, the excavated structure includes two connecting supports, the two connecting supports are respectively connected to two retaining structures, the two connecting supports are respectively connected to two ends of the bottom plate, a transverse middle plate is commonly connected between the two connecting supports, two inclined supports are arranged below the transverse middle plate, a first end of the inclined support is connected to the connecting support, and a second end of the inclined support is connected to the transverse middle plate, and an excavated hole is arranged on the transverse middle plate. Through the above scheme, the construction difficulty is reduced, the integrity of the structure is ensured, the trouble of increasing temporary support and secondary demolition is avoided, and the resistance of the existing structure to the lateral soil pressure is improved.

[0006] Furthermore, the waterproof structure adopts a waterproof measure that combines construction joints and post-cast strips. The waterproof structure includes waterstop strips and waterstop strips. The waterstop strips and waterstop strips are both arranged at the excavation holes. Through the above scheme, the waterproof effect of the structure is ensured and the long-term stable operation of the station is ensured.

[0007] Furthermore, the top plate layer includes a top plate, which is arched and is constructed by a one-time integral casting method. Through the above scheme, the construction of the top plate is carried out after the excavation is completed, which further reduces the construction difficulty, avoids the trouble of adding temporary support and secondary demolition, and further ensures the integrity of the structure.

[0008] Furthermore, after the excavation is completed, the excavation hole is backfilled and poured. The size of the excavation hole is 8000cm*6700cm. Through the above scheme, the size of the excavation hole is adjusted to ensure the improvement of the excavation efficiency and the improvement of the construction efficiency.

[0009] Furthermore, the three excavation holes can be used in combination when in use. When excavating different areas of the station, two of the three excavation holes can be used in coordination with each other or one of the excavation holes can be used alone. Through the above scheme, when excavating different areas of the station, the construction efficiency is improved by the coordinated use of the excavation holes.

[0010] Furthermore, a construction method for an arched column-free open-cut subway station shield excavation structure is also provided, and the specific steps include the following:

[0011] Step 1: First, excavate the ground and construct the retaining structures on both sides. After the retaining structures reach the designed strength, excavate downward to the first excavation surface;

[0012] Step 2: construct the first concrete support on the first excavation surface, and after the first concrete support reaches the designed strength, continue to excavate downward to the second excavation surface;

[0013] Step 3: Build the second steel support on the second excavation surface. After the second steel support reaches the designed strength, continue to excavate downward to the third excavation surface;

[0014] Step 4: Build the third steel support on the third excavation surface. After the third steel support is built, continue to excavate downward to the base;

[0015] Step 5: construct the base cushion layer, then construct the waterproof layer on the bottom plate. After the waterproof layer is completed, construct the bottom plate. After the concrete reaches the designed strength, remove the third steel support;

[0016] Step 6: Construct the waterproof layer and the connecting support, then construct the horizontal middle plate and the inclined support. After the concrete reaches the designed strength, remove the second steel support;

[0017] Step 7: When shield tunneling is carried out on the far left side, the excavation hole in the middle is used as the main excavation structure. When the advancement stage is reached, the excavation hole on the far left is used as the excavation structure. After the construction is completed, the excavation hole on the far left is blocked;

[0018] Step 8: When shield tunneling is carried out on the far right, the middle excavation hole is the main excavation structure. When it reaches the advancement stage, the rightmost excavation hole is used as the main excavation structure. After the construction is completed, the remaining excavation holes are blocked;

[0019] Step 9: After the excavation of the excavation hole range is completed, a waterproof layer is constructed on the connecting piles of the top plate and the subsequent support, and the connecting piles and the top plate of the top plate and the subsequent support are constructed. After the concrete reaches the designed strength, waterproofing is applied and backfilling is performed to the first concrete support, and then the first concrete support is removed;

[0020] Step 10: Continue to backfill the soil to the planned elevation, stop precipitation, seal the well, remove the retaining structure within three meters below the ground, and restore the road surface and road greening.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the present invention reduces the construction difficulty, avoids the trouble of adding temporary support and secondary demolition, improves the resistance of the existing structure to the lateral soil pressure, improves the construction efficiency and excavation efficiency, ensures the integrity of the structure, and enables the station to operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the present invention during the construction process is schematically shown in FIG. Figure 1 .

[0023] Figure 2 The structure of the present invention during the construction process is schematically shown in FIG. Figure 2 .

[0024] Figure 3 The structure of the present invention during the construction process is schematically shown in FIG. Figure 3 .

[0025] Figure 4 The structure of the present invention during the construction process is schematically shown in FIG. Figure 4 .

[0026] Figure 5 The structure of the present invention during the construction process is schematically shown in FIG. Figure 5 .

[0027] Figure 6 The structure of the present invention during the construction process is schematically shown in FIG. Figure 6 .

[0028] Figure 7 The structure of the present invention during the construction process is schematically shown in FIG. Figure 7 .

[0029] Figure 8 It is a schematic diagram of the structure after the construction of the present invention is completed.

[0030] Fig. 9 Schematic diagram of the layout structure of the station floor in the excavation stage according to the embodiment of the present invention Figure 1 .

[0031] Fig.10 Schematic diagram of the layout structure of the station floor in the excavation stage according to the embodiment of the present invention Figure 2 .

[0032] Figure numbers: 2-cap beam; 3-enclosing structure; 4-ground; 5-slope; 6-first concrete support; 7-second steel support; 8-third steel support; 9-bottom plate; 10-continuation support; 11-horizontal middle plate; 12-inclined support; 13-excavation hole; 14-top plate. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] Example: Figure 1-Figure 8 As shown, an arched column-free open-cut subway station shield excavated structure is used in a column-free station, including a ground 4, a station body is arranged below the ground 4, the station body includes a base, a middle plate layer and a top plate layer, the base includes a bottom plate 9, a transport track is arranged on the bottom plate 9, three excavated structures are arranged on the middle plate layer, and the top plate layer is constructed after the excavation of the station is completed. The top plates at the three excavated structures are all provided with waterproof structures, and the top plate layer includes a top plate 14, the top plate 14 is arched, and is constructed by a one-time integral casting method.

[0037] The station body also includes a bilaterally symmetrical enclosure structure 3, a cap beam 2 is arranged at the top of the enclosure structure 3, the bottom plate 9, the middle plate layer and the top plate layer are all arranged between the bilaterally symmetrical enclosure structures 3, and the form of the enclosure structure 3 is adjusted according to the on-site construction conditions.

[0038] The excavated structure includes two connecting supports 10, which are respectively connected to the two enclosure structures 3, and are respectively connected to the two ends of the bottom plate 9. A horizontal middle plate 11 is commonly connected between the two connecting supports 10, and two inclined supports 12 are arranged below the horizontal middle plate 11. The first end of the inclined support 12 is connected to the connecting support 10, and the second end of the inclined support 12 is connected to the horizontal middle plate 11. An excavated hole 13 is arranged on the horizontal middle plate 11, and the social freedom is strengthened at the excavated hole 13. The hole edge beam ensures the structural safety at the hole position and reserves the tongue and groove. After the excavation of the excavated hole 13, the filling and pouring are carried out. The size of the excavated hole 13 is 8000cm*6700cm. The junction of the top plate 14 and the two continuous supports 10 is implemented according to the longitudinal construction joint method. Waterstop and waterstop strips are set at the joints and painted with waterproof paint. The top plate 14 is implemented circumferentially according to the circumferential construction joint method, and an circumferential waterstop is set. At the same time, the post-casting strip is installed at the tongue and groove position to add a waterstop strip.

[0039] The waterproof structure adopts a waterproof measure combining construction joints and post-cast strips. The waterproof structure includes water stop strips and water stop strips, and the water stop strips and water stop strips are both arranged at the excavation hole 13.

[0040] The three excavation holes 13 can be used in combination when in use. When excavating on the leftmost side of the station, only the leftmost excavation hole 13 can be used, or the leftmost excavation hole 13 can be used in combination with the middle excavation hole 13, so that the excavation efficiency is improved; when excavating in the middle of the station, the excavation can be carried out by combining the leftmost excavation hole 13 with the middle excavation hole 13, or only the middle excavation hole 13 can be used for excavation; when excavating on the rightmost side of the station, the excavation can be carried out by combining the rightmost excavation hole 13 with the middle excavation hole 13, or only the rightmost excavation hole 13 can be used for excavation.

[0041] For example: Fig. 9 As shown, the left side is the Guanglu section, the Guanglu shield starting stage, in order to meet the shield starting technology requirements, the starting distance from the station end is 80m, the middle excavation hole 13 is the main excavation structure, when the shield machine is excavated successively and reaches the advancement stage, that is, the shield machine and the supporting trolley all enter the tunnel, at this time the leftmost excavation hole 13 is used as the main excavation structure, when the construction in the Guanglu section is completed, the leftmost excavation hole 13 is blocked;

[0042] like Fig.10 As shown, the right side is the Guangfu section. In the initial stage of the Guangfu shield machine, the middle excavation hole 13 is used as the main excavation structure. When the shield machine continues to excavate and reaches the advancement stage, the rightmost excavation hole 13 is used as the main excavation structure. After the construction of the Guangfu section is completed, the remaining two excavation holes are blocked.

[0043] To sum up, the excavation hole 13 in the middle is the main excavation structure in the initial stage of the shield tunneling. It is reusable and has high utilization efficiency. The excavation hole 13 on the far left and the excavation hole 13 on the far right are for the shield tunneling advancement stage, which can shorten the distance of soil transportation and reduce transportation time and cost. Therefore, the coordinated use of the three excavation holes improves the excavation efficiency in each stage of shield tunneling advancement.

[0044] A construction method for an arched column-free open-cut subway station shield excavation structure, the specific steps of which include:

[0045] Step 1: First, excavate at 4 points on the ground, construct the enclosure structure 3 on both sides, and after the enclosure structure 3 reaches the design strength, excavate downward to the first excavation surface;

[0046] Step 2: construct a first concrete support 6 on the first excavation surface, and after the first concrete support 6 reaches the designed strength, continue to excavate downward to the second excavation surface;

[0047] Step 3: construct a second steel support 7 on the second excavation surface, and after the second steel support 7 reaches the design strength, continue to excavate downward to the third excavation surface;

[0048] Step 4: construct a third steel support 8 on the third excavation surface. After the third steel support 8 is constructed, continue to excavate downward to the base;

[0049] Step 5: construct the base cushion layer, and then construct the waterproof layer on the bottom plate 9. After the waterproof layer is completed, construct the bottom plate 9. After the concrete reaches the designed strength, remove the third steel support 8;

[0050] Step 6: construct the waterproof layer of the connecting support 10 and the connecting support 10, then construct the horizontal middle plate 11 and the inclined support 12, and after the concrete reaches the design strength, remove the second steel support 7;

[0051] Step 7: When shield tunneling is performed on the leftmost side, the middle excavation hole 13 is used as the main excavation structure. When the advancement stage is reached, the leftmost excavation hole is used as the excavation structure. After the construction is completed, the leftmost excavation hole is blocked;

[0052] Step 8: When shield tunneling is performed on the far right side, the middle excavation hole 13 is the main excavation structure. When the advancement stage is reached, the far right excavation hole 13 is used as the main excavation structure. After the construction is completed, the remaining excavation holes 13 are blocked;

[0053] Step 9: After the excavation of the excavation hole 13 is completed, a waterproof layer is constructed on the connecting piles of the top plate 14 and the subsequent support 10, and the connecting piles of the top plate 14 and the subsequent support 10 and the top plate 14 are constructed. After the concrete reaches the designed strength, waterproofing is applied and backfilling is performed to the first concrete support 6, and then the first concrete support 6 is removed;

[0054] Step 10: Continue to backfill the soil to the planned elevation, stop precipitation, seal the well, remove the retaining structure within three meters below the ground, and restore the road surface and road greening.

[0055] Those skilled in the art may make other corresponding changes or deformations to the above technical methods and concepts, and all of these changes or deformations should fall within the protection scope of the claims of the present invention.

Claims

1. An arched column-free open-cut subway station shield excavation structure, applied in a column-free station, comprising a ground (4), a station body is arranged below the ground (4), the station body comprises a base, a middle plate layer and a top plate layer, characterized in that: The base comprises a bottom plate (9) on which a transport track is arranged, three excavated structures are arranged on the middle plate layer, and the top plate layer is constructed after the excavation of the station is completed, and the top plates at the three excavated structures are all provided with waterproof structures.

2. The column-free open-cut subway station shield excavation structure according to claim 1, characterized in that: The station body also includes a bilaterally symmetrical enclosure structure (3), a crown beam (2) is arranged at the top of the enclosure structure (3), and the bottom plate (9), middle plate layer and top plate layer are all arranged between the bilaterally symmetrical enclosure structures (3).

3. The shield excavation structure of a column-free open-cut subway station as claimed in claim 2, characterized in that: The excavation structure comprises two connecting supports (10), the two connecting supports (10) are respectively connected to two enclosure structures (3), the two connecting supports (10) are respectively connected to two ends of a bottom plate (9), a transverse middle plate (11) is commonly connected between the two connecting supports (10), two inclined supports (12) are arranged below the transverse middle plate (11), a first end of the inclined support (12) is connected to the connecting support (10), and a second end of the inclined support (12) is connected to the transverse middle plate (11), and an excavation hole (13) is arranged on the transverse middle plate (11).

4. The shield excavation structure of a column-free open-cut subway station as claimed in claim 3, characterized in that: The waterproof structure adopts a waterproof measure that combines a construction joint with a post-casting strip. The waterproof structure includes a water stop strip and a water stop belt. The water stop strip and the water stop belt are both arranged at the excavation hole (13).

5. The shield excavation structure of a column-free open-cut subway station as claimed in claim 4, characterized in that: The top plate layer comprises a top plate (14), the top plate (14) is arched and is constructed by a one-time integral casting method.

6. The shield excavation structure of a column-free open-cut subway station as claimed in claim 4, characterized in that: After the excavation is completed, the excavation hole (13) is filled and poured. The size of the excavation hole (13) is 8000cm*6700cm.

7. The shield excavation structure of a column-free open-cut subway station as claimed in claim 4, characterized in that: The three excavation holes (13) can be used in combination when in use. When excavating different areas of a station, two of the three excavation holes (13) can be used in combination or one of the excavation holes (13) can be used alone.

8. A construction method using the arched column-free open-cut subway station shield excavation structure as described in any one of claims 1 to 7, characterized in that: The specific steps include the following: Step 1: First, excavate at the ground (4), construct the enclosure structures (3) on both sides, and after the enclosure structures (3) reach the designed strength, excavate downward to the first excavation surface; Step 2: construct a first concrete support (6) on the first excavation surface, and after the first concrete support (6) reaches the designed strength, continue to excavate downward to the second excavation surface; Step 3: construct a second steel support (7) on the second excavation surface, and after the second steel support (7) reaches the designed strength, continue to excavate downward to the third excavation surface; Step 4: construct a third steel support (8) on the third excavation surface, and after the construction of the third steel support (8) is completed, continue to excavate downward to the base; Step 5: construct the base cushion layer, then construct the waterproof layer on the bottom plate (9), after the waterproof layer is completed, construct the bottom plate (9), and after the concrete reaches the designed strength, remove the third steel support (8); Step 6: construct the waterproof layer of the connecting support (10) and the connecting support (10), then construct the horizontal middle plate (11) and the inclined support (12), and after the concrete reaches the designed strength, remove the second steel support (7); Step 7: When shield tunneling is performed on the leftmost side, the middle excavation hole (13) is used as the main excavation structure. When the advancement stage is reached, the leftmost excavation hole is used as the excavation structure. After the construction is completed, the leftmost excavation hole is blocked; Step 8: When shield tunneling is performed on the rightmost side, the middle excavation hole (13) is the main excavation structure. When the advancement stage is reached, the rightmost excavation hole (13) is used as the main excavation structure. After the construction is completed, the remaining excavation holes (13) are blocked; Step 9: After the excavation of the excavation hole (13) is completed, a waterproof layer is constructed on the connecting piles of the top plate (14) and the subsequent support (10), and the connecting piles of the top plate (14) and the subsequent support (10) and the top plate (14) are constructed. After the concrete reaches the designed strength, waterproofing is applied and backfilling is performed to the first concrete support (6), and then the first concrete support (6) is removed; Step 10: Continue to backfill the soil to the planned elevation, stop precipitation, seal the well, remove the retaining structure within three meters below the ground, and restore the road surface and road greening.

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