Support structure for a flattened oval widened passage

Abstract

The utility model provides a kind of support structure of flat round widening ground passage, including advance pipe layer, primary lining layer, secondary lining layer, supporting mechanism, water diversion mechanism, advance pipe layer includes several groups of support guide pipe, several groups of support guide pipe are interval setting along the excavation direction of ground passage, each support guide pipe is inserted into the excavation side wall of ground passage in inclined shape, primary lining layer covers the excavation side wall of ground passage and fits, secondary lining layer covers the excavation side wall and bottom surface of ground passage, and with the inner wall of primary lining layer fits, supporting mechanism includes two longitudinal beams and several struts, two longitudinal beams are supported by several struts, and form support to the side wall section of secondary lining layer, water diversion mechanism includes two water diversion channels and several water diversion pipes, water diversion pipe is divided into two groups, one end of each group water diversion pipe is communicated with the space between waterproof layer and primary lining layer, the other end is communicated with corresponding water diversion channel.The utility model is simple in structure, stable, and permanent support can be formed for flat round widening ground passage.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction, and in particular to a support structure for a flattened, widened tunnel. Background Technology

[0002] When construction companies excavate underpasses in busy road sections, the presence of underground pipelines and limitations on excavation depth make traditional tunnel structures unsuitable. Instead, they must excavate widened, flattened oval tunnel structures. This type of tunnel structure, while maintaining width, allows for minimizing height. Figure 1 As shown.

[0003] When construction units are excavating and widening flat-round tunnels, traditional temporary support structures cannot meet the required support strength. Therefore, it is necessary to design a simple and stable support structure for this special structure. Summary of the Invention

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a support structure for a widened, flat-oval tunnel. This structure is simple and stable, and can provide permanent support for the widened, flat-oval tunnel.

[0005] The technical solution of this utility model is: a support structure for a widened, flat-round underground tunnel, including an advanced pipe insertion layer, a primary lining layer, a secondary lining layer, a support mechanism, and a water diversion mechanism. The advanced pipe insertion layer includes several sets of support pipes, which are spaced apart along the excavation direction of the underground tunnel, and each set of support pipes is circumferentially distributed along the sidewall of the underground tunnel. Each support pipe is inserted into the excavated sidewall of the underground tunnel at an angle. The primary lining layer and the secondary lining layer are both reinforced concrete layers. The primary lining layer covers and adheres to the excavated sidewall of the underground tunnel, and the secondary lining layer covers the excavated sidewall and bottom surface of the underground tunnel, and is flush with the inner surface of the primary lining layer. The wall is fitted together, and a waterproof layer is provided between the primary lining and the secondary lining. The support mechanism includes two longitudinal beams extending along the excavation direction and several pillars. The two longitudinal beams are symmetrically distributed along the central axis of the tunnel and supported by several pillars. The two longitudinal beams provide support for the side wall section of the secondary lining. The water diversion mechanism includes two water diversion channels and several water diversion pipes. The water diversion channels extend along the excavation direction of the tunnel and one end extends outward from the entrance of the tunnel. The water diversion pipes are divided into two groups. One end of each group of water diversion pipes is connected to the space between the waterproof layer and the primary lining, and the other end is connected to the corresponding water diversion channel.

[0006] The support pipe is made of steel bars or seamless steel pipe, and the angle between the support pipe and the side wall of the underground passage is 10-15°.

[0007] The bottom of each of the aforementioned pillars is expanded to form a support base, which is supported on the inner sidewall of the bottom surface of the second lining layer.

[0008] Several supports are divided into two groups, each group of supports provides support for the longitudinal beam, and the supports in each group are evenly spaced along the length of the longitudinal beam.

[0009] The water diversion channel is equipped with a grating at its opening, which is level with the backfill surface of the underground channel, while the height of each water diversion pipe is lower than the height of the backfill surface of the underground channel.

[0010] The water diversion channel is fixed to the support pillar and located between two longitudinal beams.

[0011] The above technical solution has the following beneficial effects:

[0012] 1. The support structure of the widened, flat-round tunnel includes an advanced pipe insertion layer, a primary lining layer, a secondary lining layer, a support mechanism, and a water diversion mechanism. The advanced pipe insertion layer is used to compact and reinforce the rock strata on the tunnel sidewalls. The primary lining layer provides initial support to the excavated tunnel sidewalls to prevent collapse. The secondary lining layer, as a circumferentially closed-loop support structure, forms the tunnel space and provides secondary support. The support mechanism supports the secondary lining layer, and the water diversion mechanism drains accumulated water outside the tunnel sidewalls to ensure the tunnel structure's safety. The advanced pipe insertion layer includes several sets of support pipes, spaced apart along the excavation direction of the tunnel. Each set of support pipes is circumferentially distributed along the tunnel sidewalls, and each support pipe is inserted at an angle into the excavated sidewalls. This means the support pipes can be inserted into the surrounding rock strata of the tunnel section to be excavated, pre-reinforcing the tunnel sidewalls and reducing the risk of sidewall collapse during excavation. Both the primary and secondary lining layers are reinforced concrete layers. The primary lining layer covers and adheres to the excavated sidewalls of the tunnel. After excavation, a steel mesh is laid and shotcrete is applied to form the primary lining layer as temporary support, improving the structural stability of the tunnel sidewalls. The secondary lining layer covers the excavated sidewalls and bottom of the tunnel and adheres to the inner wall of the primary lining layer; that is, the internal space of the secondary lining layer forms the tunnel space. A waterproof layer is installed between the primary and secondary lining layers to reduce the adverse effects of rock seepage water on the secondary lining layer and ensure its service life. The support structure includes two longitudinal beams extending along the excavation direction and several pillars. The two longitudinal beams are symmetrically distributed along the central axis of the tunnel and supported by several pillars. The two longitudinal beams provide support for the sidewall sections of the secondary lining layer, improving its structural strength and providing support for the sidewall sections of large-span secondary lining layers, ensuring the stability of the excavated tunnel and preventing collapse accidents. The water diversion mechanism includes two water diversion channels and several water diversion pipes. The water diversion channels extend along the excavation direction of the underground passage, with one end extending outward from the entrance of the underground passage. The water diversion pipes are divided into two groups. One end of each group of water diversion pipes is connected to the space between the waterproof layer and the initial lining layer, and the other end is connected to the corresponding water diversion channel. The accumulated water outside the waterproof layer is discharged outside the underground passage through the water diversion pipes and water diversion channels, reducing the adverse effects of accumulated water on the underground passage structure.

[0013] 2. The support pipe is made of steel bars or seamless steel pipe, and the angle between the support pipe and the side wall of the tunnel is 10-15°. This inclined angle of the support pipe facilitates construction and installation while ensuring the strength of the reinforced surrounding rock.

[0014] 3. The bottom diameter of each of the aforementioned pillars is expanded to form a support base, which is supported on the inner side wall of the bottom surface of the second lining layer, thereby improving the structural strength and stability of the pillars.

[0015] 4. The inlet of the water diversion channel is equipped with a grating plate, which is flush with the backfill surface of the underground passage. The height of each water pipe is lower than the backfill surface of the underground passage. The water diversion channel is fixed on the support column and located between two longitudinal beams. The backfill material of the underground passage forms a shield for the water pipe, ensuring the structural safety of the water pipe. At the same time, the water diversion channel being flush with the backfill surface also facilitates the maintenance of the underground passage.

[0016] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a tunnel structure in the background art of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model.

[0019] In the attached diagram, 1 is the pre-insertion layer, 2 is the primary lining layer, 3 is the secondary lining layer, 4 is the support mechanism, 5 is the water diversion mechanism, 6 is the support guide pipe, 7 is the waterproof layer, 8 is the longitudinal beam, 9 is the support column, 10 is the water diversion channel, 11 is the water diversion pipe, 12 is the support base, and 13 is the grid plate. Detailed Implementation

[0020] See Figure 2This is a specific embodiment of a support structure for a widened, flat-oval underground tunnel. The support structure for the widened, flat-oval underground tunnel includes an advanced pipe layer 1, a primary lining layer 2, a secondary lining layer 3, a support mechanism 4, and a water diversion mechanism 5. The advanced pipe layer 1 includes several groups of support pipes 6, which are spaced apart along the excavation direction of the underground tunnel. Each group of support pipes is circumferentially distributed along the sidewall of the underground tunnel. Each support pipe 6 is inserted into the excavated sidewall of the underground tunnel at an angle. Specifically, the support pipes are made of steel bars or seamless steel pipes, and the angle between the support pipe 6 and the sidewall of the underground tunnel is 10-15°. Typically, the circumferential spacing (circumferential spacing) of the same group of support pipes is 0.3m. Furthermore, double-layer support pipes can be installed at the arch position of the underground tunnel sidewall, that is, to increase the density of the support pipes to further improve the structural strength of the arch. The distance between adjacent groups of support pipes is determined according to the actual situation. Both the primary lining layer 2 and the secondary lining layer 3 are reinforced concrete layers. The primary lining layer 2 covers and adheres to the excavated sidewalls of the tunnel. The secondary lining layer 3 covers the excavated sidewalls and bottom surface of the tunnel and adheres to the inner wall of the primary lining layer 2. A waterproof layer 7 is provided between the primary lining layer 2 and the secondary lining layer 3. The waterproof layer is composed of a waterproof board and non-woven fabric composite, which is a conventional construction structure. The support mechanism 4 includes two longitudinal beams 8 extending along the excavation direction and several pillars 9. The two longitudinal beams 8 are symmetrically distributed along the central axis of the tunnel and supported by several pillars 9. The two longitudinal beams 8 provide support for the sidewall section of the secondary lining layer 3. Specifically, the several pillars 9 are divided into two groups, and each group of pillars provides support for the longitudinal beams 8. The pillars in each group are evenly spaced along the length of the longitudinal beams. The bottom of each pillar 9 is enlarged to form a support seat 12, which is supported on the inner sidewall of the bottom surface of the secondary lining layer 3. That is, it can be regarded as the pillars supporting the internal space of the secondary lining layer. The water diversion mechanism 5 includes two water diversion channels 10 and several water diversion pipes 11. The water diversion channels 10 extend along the excavation direction of the underground passage, with one end extending out of the entrance of the underground passage. The water diversion pipes 11 are divided into two groups. One end of each group of water diversion pipes 11 is connected to the space between the waterproof layer 7 and the initial lining layer 2, and the other end is connected to the corresponding water diversion channel 10. Specifically, the water diversion channel 10 is fixed on the support column 9 and located between two longitudinal beams 8. The channel opening of the water diversion channel 10 is provided with a grating plate 13, which is flush with the height of the backfill surface of the underground passage. The height of each water diversion pipe 11 is lower than the height of the backfill surface of the underground passage.

Claims

1. A support structure for a flattened, widened earth channel, characterized in that: It includes an advanced tube insertion layer (1), a primary lining layer (2), a secondary lining layer (3), a support structure (4), and a water diversion structure (5). The advanced insertion layer (1) includes several sets of support pipes (6). The several sets of support pipes (6) are spaced apart along the excavation direction of the underground tunnel, and the support pipes of each set are distributed circumferentially along the side wall of the underground tunnel. Each support pipe (6) is inserted into the excavated side wall of the underground tunnel at an angle. The primary lining (2) and the secondary lining (3) are both reinforced concrete layers. The primary lining (2) covers and adheres to the excavated sidewall of the tunnel. The secondary lining (3) covers the excavated sidewall and bottom surface of the tunnel and adheres to the inner wall of the primary lining (2). A waterproof layer (7) is provided between the primary lining (2) and the secondary lining (3). The support structure (4) includes two longitudinal beams (8) extending along the excavation direction, and several pillars (9). The two longitudinal beams (8) are symmetrically distributed along the central axis of the underground passage and are supported by several pillars (9). The two longitudinal beams (8) provide support for the side wall section of the secondary lining (3). The water intake mechanism (5) includes two water intake channels (10) and several water intake pipes (11). The water diversion channel (10) extends along the excavation direction of the underground passage, and one end extends out of the entrance of the underground passage. The water diversion pipe (11) is divided into two groups. One end of each group of water diversion pipes (11) is connected to the space between the waterproof layer (7) and the initial lining layer (2), and the other end is connected to the corresponding water diversion channel (10).

2. The support structure for the widened, flattened circular tunnel according to claim 1, characterized in that: The support conduit (6) is made of steel bars or seamless steel pipes, and the angle between the support conduit (6) and the side wall of the underground passage is 10-15°.

3. The support structure for the widened, flattened circular tunnel according to claim 1, characterized in that: The bottom diameter of each of the pillars (9) is expanded to form a support seat (12), which is supported on the inner side wall of the bottom surface of the second lining layer (3).

4. The support structure for the flattened, widened earth channel according to claim 1 or 3, characterized in that: Several pillars (9) are divided into two groups, and each group of pillars supports the longitudinal beam (8), and each group of pillars is evenly spaced along the length of the longitudinal beam.

5. The support structure for the widened, flattened circular tunnel according to claim 1, characterized in that: The water diversion channel (10) is equipped with a grating (13) at its opening, which is level with the height of the backfill surface of the underground channel, and the height of each water pipe (11) is lower than the height of the backfill surface of the underground channel.

6. The support structure for the flattened, widened earth channel according to claim 1 or 5, characterized in that: The water diversion channel (10) is fixed on the support column (9) and located between the two longitudinal beams (8).

Images