Ventilation shaft for subway section tunnel and construction method thereof

Abstract

The present invention discloses a ventilation shaft for a subway section tunnel and a construction method thereof, and belongs to the technical field of ventilation shafts. The technical scheme is as follows: it comprises a piston ventilation shaft, wherein two piston ventilation shafts are provided, respectively located above two subway section tunnels and connected to the subway section tunnels, wherein an evacuation staircase is provided in one of the piston ventilation shafts; an underground fan room is provided above the two piston ventilation shafts, the underground fan room is connected to the two piston ventilation shafts, and the underground fan room is provided with an equipment room, an evacuation staircase, a fresh air shaft and an exhaust shaft; the top of the underground fan room is provided with a piston air inlet, a piston air outlet, an evacuation staircase outlet, a fresh air outlet and an exhaust air outlet, and the piston air inlet, the piston air outlet, the evacuation staircase outlet, the fresh air outlet and the exhaust air outlet extend out of the ground; and a communication channel is provided between the two subway section tunnels. The present invention adopts a direct outlet mode of the ventilation shaft, optimizes the large tunnel section of the traditional ventilation shaft, reduces the tunnel volume, and reduces the engineering cost.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation shafts, and in particular to a ventilation shaft for a subway section tunnel and a construction method thereof. Background Art

[0002] As the construction of national rail transit increases, there are more and more long and large sections. Considering the ventilation and disaster prevention needs of the sections, intermediate air shafts are generally required to be set up in sections larger than 2.5 km.

[0003] like Figure 1 As shown, the traditional air shaft is generally composed of an air shaft, an air duct, and a ground air outlet. The air duct is located on the side of the tunnel. The general air duct structure is a large-section horseshoe-shaped tunnel (such as Figure 2 As shown in the figure, the span is about 13-15m, the height is about 12-15m, and the equipment room is arranged inside the air duct. The length of the air duct is generally 15-20m. Such a structure makes the air duct volume larger, and it is a dark excavated large-span tunnel. During the construction process, the air shaft is generally used as a construction shaft, and the inverted shaft wall method is used for construction. The horizontal channel is used as the main channel for construction slag discharge and feeding. The step method, CD method, and CRD method are used for construction. There are problems such as large air duct section, slow construction, and high risk. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the problems of large structural size, greater risk and high cost of traditional ventilation shafts, the present invention provides a ventilation shaft for subway section tunnels and a construction method thereof, which fully considers the implementation volume of the ventilation shaft, adopts the form of ventilation shaft directly out of the ground, sets up an underground fan room at the point where it emerges from the ground, provides equipment room, fully reduces construction risks, and reduces investment at the same time.

[0005] On the one hand, the present invention provides an air shaft for a subway section tunnel, including a piston air shaft, wherein two piston air shafts are provided, respectively located above two subway section tunnels and connected with the subway section tunnels, wherein an evacuation staircase is provided in one of the piston air shafts; an underground fan room is provided above the two piston air shafts, the underground fan room is connected with the two piston air shafts, and an equipment room, evacuation stairs, a fresh air shaft and an exhaust shaft are provided in the underground fan room; a piston air inlet, a piston air outlet, an evacuation stair exit, a fresh air inlet and an exhaust air outlet are provided on the top of the underground fan room, and the piston air inlet, the piston air outlet, the evacuation stair exit, the fresh air inlet and the exhaust air outlet extend out of the ground; a communication channel is provided between the two subway section tunnels.

[0006] Preferably, the communication channel is located between two piston air shafts.

[0007] On the other hand, the present invention provides a construction method for a ventilation shaft of a subway section tunnel, comprising the following steps:

[0008] S1: First dig a shallow foundation pit for the underground fan room;

[0009] S2: Complete the enclosure structure of two piston air shafts at the bottom of the shallow foundation pit;

[0010] S3: Use the piston air shaft as the construction shaft of the subway section tunnel to complete the main body of the subway section tunnel;

[0011] S4: After the subway section tunnel is completed, the main structure of the piston ventilation shaft will be constructed;

[0012] S5: Complete the main structure of the underground fan room above the piston air shaft;

[0013] S6: Complete the backfilling of foundation pit and construct the upper structure of ventilation shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention optimizes the tunnel section of the traditional air shaft by setting the piston air shaft above the subway section tunnel and setting the underground fan room above the piston air shaft, that is, the air shaft directly out, reducing the tunnel volume, and using shallow buried foundation pit engineering instead, thereby reducing the project cost and construction risk. In addition, the direct outlet of the air shaft of the present invention reduces the length of the air duct, which is beneficial to the ventilation and disaster prevention of the tunnel.

[0016] 2. The present invention adopts two independent piston air shafts, that is, the piston air shafts are separated, and two temporary construction shafts are provided, which increases the ways of slag discharge and material feeding, reduces the construction period, and improves the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a traditional wind shaft.

[0018] Figure 2 It is a schematic diagram of the cross section of the air duct of a traditional air shaft.

[0019] Figure 3 It is a structural schematic diagram of the present invention.

[0020] Figure 4 It is a schematic diagram of step S1 in the construction method of the present invention.

[0021] Figure 5 It is a schematic diagram of step S2 in the construction method of the present invention.

[0022] Figure 6 It is a schematic diagram of step S3 in the construction method of the present invention.

[0023] Figure 7 It is a schematic diagram of step S4 in the construction method of the present invention.

[0024] Figure 8It is a schematic diagram of step S5 in the construction method of the present invention.

[0025] Fig. 9 It is a schematic diagram of step S6 in the construction method of the present invention.

[0026] In the figure, 1-piston air shaft, 2-subway section tunnel, 3-underground fan room, 4-piston air inlet, 5-piston air outlet, 6-evacuation stair exit, 7-communication passage, 8-fresh air inlet, 9-exhaust outlet. DETAILED DESCRIPTION

[0027] like Figure 3 As shown, the present invention provides a ventilation shaft for a subway section tunnel, including a piston ventilation shaft 1, wherein two piston ventilation shafts 1 are provided, respectively located above two subway section tunnels 2 and connected to the subway section tunnels 2, wherein an evacuation staircase is provided in one of the piston ventilation shafts 1; an underground fan room 3 is provided above the two piston ventilation shafts 1, the underground fan room 3 is connected to the two piston ventilation shafts 1, and an equipment room, an evacuation staircase, a fresh air shaft and an exhaust shaft are provided in the underground fan room 3; a piston air inlet 4, a piston air outlet 5, an evacuation staircase outlet 6, a fresh air inlet 8 and an exhaust air inlet 9 are provided on the top of the underground fan room 3, and the piston air inlet 4, the piston air outlet 5, the evacuation staircase outlet 6, the fresh air inlet 8 and the exhaust air inlet 9 extend out of the ground; and a communication channel 7 is provided between the two subway section tunnels 2 at the two piston ventilation shafts 1. The fresh air shaft and the exhaust air shaft are the existing structures of the traditional ventilation shaft, and their specific structures are not repeated here.

[0028] like Figure 4-9 As shown, the ventilation shaft of this embodiment is constructed according to the following steps:

[0029] S1: First dig a shallow foundation pit for the underground fan room 3;

[0030] S2: Complete the enclosure structure of two piston air shafts 1 at the bottom of the shallow foundation pit;

[0031] S3: Use the piston air shaft 1 as the construction shaft of the subway section tunnel 2 to complete the main body of the subway section tunnel 2;

[0032] S4: After the subway section tunnel 2 is completed, the main structure of the piston ventilation shaft 1 will be constructed;

[0033] S5: Complete the main structure of the underground fan room 3 above the piston air shaft 1;

[0034] S6: Complete the backfilling of foundation pit and construct the upper structure of ventilation shaft.

[0035] The present invention optimizes the tunnel cross-section of the traditional air shaft by setting the piston air shaft 1 above the subway section tunnel 2 and setting the underground fan room 3 above the piston air shaft 1, that is, the air shaft directly exits, reducing the tunnel volume and overall cost, and reducing construction risks. In addition, the air shaft of the present invention directly exits, reducing the length of the air duct, which is beneficial to ventilation and disaster prevention of the tunnel.

[0036] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all of these shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A construction method for a ventilation shaft in a subway section tunnel, characterized in that: A ventilation shaft for a subway section tunnel, comprising a piston ventilation shaft (1), wherein two piston ventilation shafts (1) are provided, respectively located above two subway section tunnels (2) and connected to the subway section tunnels (2), and an evacuation staircase is provided in one of the piston ventilation shafts (1); An underground fan room (3) is arranged above the two piston air shafts (1), the underground fan room (3) is connected to the two piston air shafts (1), and an equipment room, an evacuation staircase, a fresh air shaft, and an exhaust air shaft are arranged in the underground fan room (3); a piston air inlet (4), a piston air outlet (5), an evacuation staircase outlet (6), a fresh air inlet (8), and an exhaust air outlet (9) are arranged on the top of the underground fan room (3), and the piston air inlet (4), the piston air outlet (5), the evacuation staircase outlet (6), the fresh air inlet (8), and the exhaust air outlet (9) protrude from the ground; A communication passage (7) is provided between the two subway section tunnels (2), and the communication passage (7) is located between the two piston air shafts (1); The construction method of the ventilation shaft for a subway section tunnel comprises the following steps: S1: First dig a shallow foundation pit for the underground fan room (3); S2: Complete the enclosure structure of two piston air shafts (1) at the bottom of the shallow foundation pit; S3: Using the piston air shaft (1) as a construction shaft of the subway section tunnel (2) to complete the main body of the subway section tunnel (2); S4: After the subway section tunnel (2) is completed, the main structure of the piston ventilation shaft (1) is constructed; S5: completing the main structure of the underground fan room (3) above the piston air shaft (1); S6: Complete the backfilling of foundation pit and construct the upper structure of ventilation shaft.

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