Construction method for connecting the air duct reconstruction of subway air shaft

Abstract

The invention discloses a method for constructing a subway air shaft for air duct reconstruction and connection, comprising the following steps: 1. cutting a part of the above-ground structure of the original air shaft (10); 2. partially closing the original air shaft and providing a top ventilation structure (11) and a side ventilation structure (12); 3. constructing a new air shaft (20) and leaving an air shaft connection area (30) between the new air shaft and the original air shaft; 4. completely covering the connection part between the original air shaft and the air shaft connection area through a retaining wall (101) and an isolation plate (102) in the original air shaft; 5. constructing the air shaft connection area and its connection part with the original air shaft; 6. removing the retaining wall, connecting the original air shaft, the air shaft connection area and the new air shaft, and completely closing the original air shaft; 7. removing the above-ground part of the original air shaft and constructing upper waterproofing and earthwork backfilling. The invention can ensure the safe construction of the new air shaft and the air shaft connection area by retaining part of the structure and ventilation function of the original air shaft, which is conducive to shortening the construction period of the air duct connection reconstruction and does not affect the subway operation.

Description

Technical Field

[0001] The invention relates to a ventilation and exhaust system reconstruction method, and in particular to an air duct reconstruction and connection construction method for a subway air shaft. Background Art

[0002] Subway is an important part of urban transportation. Most subway lines run underground. In order to meet the ventilation and exhaust needs of underground platforms and station halls, multiple wind pavilions are usually installed outside the main structure of the subway. The wind pavilions are connected to the wind chambers in the main structure of the subway through wind shafts to achieve ventilation and exhaust. Due to reasons such as plot planning or structural transformation, the subway wind shaft needs to be renovated, that is, a new wind shaft is excavated and built near the original wind shaft, and the direction of the wind shaft is changed from the original wind shaft to the new wind shaft. The existing construction method is: first close the original wind shaft, then construct the new wind shaft and connect the wind duct. This construction method limits the ventilation and exhaust function of the subway and affects the normal operation of the subway. In addition, during the excavation of the new wind shaft, due to the large load of the original wind shaft, the excavation and construction of the new wind shaft near the original wind shaft have great safety hazards. The original wind shaft needs to be reinforced, which is difficult and requires the approval and cooperation of the subway unit, which seriously affects the progress of the construction period. Summary of the invention

[0003] The purpose of the present invention is to provide a method for the reconstruction and connection of the air duct of a subway air shaft, which can ensure the safe construction of the new air shaft and the air shaft connection area by retaining part of the above-ground structure and ventilation function of the original air shaft, which is conducive to shortening the construction period of the air shaft channel reconstruction and ensuring that the air duct connection reconstruction of the original air shaft and the new air shaft does not affect the subway operation.

[0004] The present invention is achieved in that:

[0005] A method for constructing and connecting an air duct of a subway air shaft, comprising the following steps:

[0006] Step 1: Cut part of the above-ground structure of the original air shaft;

[0007] Step 2: Partially seal the original air shaft after cutting, and set up the top ventilation structure and the side ventilation structure;

[0008] Step 3: Dig and construct a new air shaft in the vicinity of the original air shaft, leaving an air shaft connection area between the new air shaft and the original air shaft;

[0009] Step 4: construct a retaining wall in the original air shaft, and form a closed structure between the retaining wall and the inner wall of the original air shaft through the isolation plate, so that the closed structure can completely cover the connecting hole part of the original air shaft and the connecting area of ​​the air shaft, and temporarily isolate the original air shaft and the connecting area of ​​the air shaft;

[0010] Step 5: Excavate and construct the air shaft connection area, and construct the connection part between the original air shaft and the air shaft connection area;

[0011] Step 6: Remove the retaining wall, connect the original air shaft with the new air shaft through the air shaft connection area, and completely close the original air shaft;

[0012] Step 7: Remove the above-ground part of the original air shaft, and carry out upper waterproofing and earth backfilling construction on the original air shaft.

[0013] In the steps described, part of the above-ground structure of the original air shaft is cut to 0.6m above the ground elevation.

[0014] In the steps described, the original air shaft includes a fresh air shaft, an exhaust air shaft and multiple piston air shafts. A top ventilation structure is set on one of the piston air shafts of the original air shaft, a side ventilation structure is set on one of the piston air shafts of the original air shaft, and the remaining piston air shafts, fresh air shafts and exhaust air shafts are closed.

[0015] The remaining piston air shaft, fresh air shaft and exhaust air shaft are closed with hard isolation panels.

[0016] The top ventilation structure adopts a protective mesh with an annular structure, and the protective mesh is circumferentially arranged on the top of the piston air shaft.

[0017] The side ventilation structure adopts a hard shed body with rainproof vents on the side and a sprinkler system on the top, and a water retaining sill is left at the bottom of the rainproof vents. The hard shed body cover is arranged on the top of the piston air shaft.

[0018] The width of the gap between the retaining wall and the inner wall of the original air shaft is 400 mm, the thickness of the retaining wall is 200 mm, and it is built with autoclaved aerated blocks.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Since the present invention retains part of the above-ground structure of the original air shaft during the air shaft reconstruction construction process and closes the original air shaft after the reconstruction is completed, it can not only ensure the normal use of the ventilation function of the original air shaft and the normal operation of the subway, but also reduce the load of the original air shaft and ensure the excavation and construction safety of the adjacent new air shaft, thereby reducing the safety hazards of construction to the greatest extent, being conducive to ensuring the construction quality and construction progress, and can be widely used in the air shaft reconstruction construction of the subway in operation.

[0021] 2. Since the present invention ensures the exhaust function of the original air shaft and completely isolates the connection construction position between the original air shaft and the air shaft connection area through retaining walls and isolation plates, the new air shaft and the air shaft connection area can be constructed under the premise of normal use of the original air shaft, which can reduce the construction workload and operation time in the subway area inside the air shaft, shorten the construction period, and reduce construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a construction schematic diagram of the air duct reconstruction and connection construction method of the subway air shaft of the present invention;

[0023] Figure 2 It is a schematic diagram of the modified construction method of the subway air shaft air duct modification and connection of the present invention;

[0024] Figure 3 It is a construction schematic diagram of step 2 in the air duct reconstruction and connection construction method of the subway air shaft of the present invention.

[0025] In the figure, 10 is the original air shaft, 11 is the top ventilation structure, 12 is the side ventilation structure, 121 is the rainproof vent, 122 is the water retaining sill, 123 is the sprinkler system, 13 is the hard isolation board, 101 is the retaining wall, 102 is the isolation board, 20 is the new air shaft, and 30 is the air shaft connecting area. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] Please see attached Figure 1 and attached Figure 2 A method for connecting and reconstructing an air duct of a subway air shaft comprises the following steps:

[0028] Step 1: Cut part of the above-ground structure of the original air shaft 10.

[0029] Preferably, part of the above-ground structure of the original air shaft 10 is cut to 0.6 m above the ground elevation, which greatly reduces the load on the above-ground structure of the original air shaft 10, so as to ensure the safety of the foundation pit excavation and construction of the adjacent new air shaft 20, and also ensure the normal use of the ventilation function of the original air shaft 10. During the construction, the ventilation direction of the original air shaft 10 is as follows: Figure 1 Indicated by the arrow.

[0030] Please see attached Figure 3 Step 2: Partially seal the original air shaft 10 after cutting, and set up a top ventilation structure 11 and a side ventilation structure 12 to ensure that the original air shaft 10 can still provide ventilation functions of top ventilation and side ventilation to meet the ventilation requirements of normal operation of the subway.

[0031] The original air shaft 10 usually includes a fresh air shaft, an exhaust air shaft and multiple piston air shafts. Preferably, a top ventilation structure 11 is set on one of the piston air shafts of the original air shaft 10, and a side ventilation structure 12 is set on one of the piston air shafts of the original air shaft 10, and the remaining piston air shafts, fresh air shafts and exhaust air shafts are closed, thereby ensuring the ventilation function of the top and sides, minimizing the impact on the ventilation function of the subway, and ensuring the normal operation of the subway.

[0032] Preferably, the remaining piston air shafts, fresh air shafts and exhaust shafts can be closed with hard isolation panels 13 to ensure.

[0033] Preferably, the top ventilation structure 11 may be a protective mesh with an annular structure, which is circumferentially arranged on the top of the piston air shaft. The protective mesh may be made of a dense mesh steel wire mesh or other materials to ensure the ventilation requirements of the original air shaft 10.

[0034] Preferably, the side ventilation structure 12 can adopt a hard shed body with rainproof vents 121 on the side and a sprinkler system 123 on the top, and a water retaining sill 122 is left at the bottom of the rainproof vents 121, and the hard shed body cover is set on the top of the piston air shaft.

[0035] The rainproof vents 121 can be made of rainproof louvers to ensure the side ventilation of the original air shaft 10 and the rainproof requirements of the vents; the height of the water retaining sill 122 can be adaptively adjusted according to the local rainfall conditions, and the height of the water retaining sill 122 is preferably 50 cm to ensure the rainproof function of the side ventilation structure 12; the sprinkler system 123 ensures the fire-proof sprinkler function of the original air shaft 10.

[0036] Step 3: excavate and construct a new air shaft 20 in the vicinity of the original air shaft 10, leaving an air shaft connecting area 30 between the new air shaft 20 and the original air shaft 10. The new location of the new air shaft 20 can be determined according to the design drawings, and the new air shaft 20 adopts the existing construction technology, which will not be repeated here.

[0037] Step 4: Construct a retaining wall 101 in the original air shaft 10. The retaining wall 101 forms a closed structure with the inner wall of the original air shaft 10 through the isolation plate 102, so that the closed structure can completely cover the connecting hole between the original air shaft 10 and the air shaft connecting area 30, and temporarily isolate the original air shaft 10 from the air shaft connecting area 30 to ensure that the construction in the air shaft connecting area 30 does not affect the ventilation function of the original air shaft 10.

[0038] Since the air duct of the original air shaft 10 needs to be connected with the new air shaft 20, a connecting hole needs to be excavated on the common wall between the original air shaft 10 and the air shaft connecting area 30. In order to prevent the hole excavation from affecting the normal use of the original air shaft 10, the closed structure formed by the retaining wall 101 and the isolation plate 102 completely blocks the hole to play the role of isolating smoke, dust and wind.

[0039] Preferably, the width of the gap between the retaining wall 101 and the inner wall of the original air shaft 10 is 400 mm, and the thickness of the retaining wall 101 is 200 mm. It can be built with autoclaved aerated blocks, with high structural strength and convenient and quick construction, ensuring that the original air shaft 10 can be used normally before the new air shaft 20 is connected with the original air shaft 10 through the air shaft connecting area 30.

[0040] Step 5: Excavate and construct the air shaft connection area 30, which is used to provide a connection transition function between the new air shaft 20 and the air duct of the original air shaft 10 to ensure the switching and redirection of the air duct, and construct the connection hole between the original air shaft 10 and the air shaft connection area 30. The excavation and construction of the air shaft connection area 30 are carried out according to the design drawings using existing construction technology, which will not be repeated here.

[0041] Step 6: Remove the retaining wall 101, connect the original air shaft 10 and the new air shaft 20 through the air shaft connecting area 30, and completely close the original air shaft 10, completing the construction of switching the air duct from the original air shaft 10 to the air duct of the new air shaft 20. The ventilation function is completely undertaken by the new air shaft 20, and the original air shaft 10 can be completely closed.

[0042] Step 7: Remove the above-ground part of the original air shaft 10, and perform upper waterproofing, earth backfilling and other construction on the original air shaft 10, thereby completing the transformation of the original air shaft 10 into the new air shaft 20, and ensuring the waterproofing and load-bearing functions of the original air shaft 10.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for connecting and reconstructing the air duct of a subway air shaft, characterized by: The following steps are involved: Step 1: cutting part of the above-ground structure of the original air shaft (10); Step 2: Partially seal the cut original air shaft (10), and set a top ventilation structure (11) and a side ventilation structure (12); Step 3: excavating and constructing a new air shaft (20) in the vicinity of the original air shaft (10), leaving an air shaft connecting area (30) between the new air shaft (20) and the original air shaft (10); Step 4: constructing a retaining wall (101) in the original air shaft (10), wherein the retaining wall (101) forms a closed structure with the inner wall of the original air shaft (10) through the isolation plate (102), so that the closed structure can completely cover the connecting hole portion of the original air shaft (10) and the air shaft connecting area (30), and temporarily isolate the original air shaft (10) and the air shaft connecting area (30); Step 5: excavating and constructing the air shaft connecting area (30), and constructing the connecting portion between the original air shaft (10) and the air shaft connecting area (30); Step 6: Remove the retaining wall (101), connect the original air shaft (10) and the new air shaft (20) through the air shaft connecting area (30), and completely close the original air shaft (10); Step 7: Remove the above-ground part of the original air shaft (10), and perform upper waterproofing and earth backfilling construction on the original air shaft (10).

2. The method for reconstruction and connection of the air duct of a subway air shaft according to claim 1 is characterized by: In the step 1, part of the above-ground structure of the original air shaft (10) is cut to a point 0.6 m above the ground elevation.

3. The method for connecting the air duct of a subway air shaft according to claim 1 is characterized by: In the step 1, the original air shaft (10) includes a fresh air shaft, an exhaust air shaft and a plurality of piston air shafts, a top ventilation structure (11) is arranged on one of the piston air shafts of the original air shaft (10), a side ventilation structure (12) is arranged on one of the piston air shafts of the original air shaft (10), and the remaining piston air shafts, fresh air shafts and exhaust air shafts are closed.

4. The method for reconstruction and connection of the air duct of a subway air shaft according to claim 3 is characterized by: The remaining piston air shaft, fresh air shaft and exhaust air shaft are sealed by using a hard isolation plate (13).

5. The method for reconstruction and connection of the air duct of a subway air shaft according to claim 3 is characterized by: The top ventilation structure (11) adopts a protective mesh with an annular structure, and the protective mesh is circumferentially arranged on the top of the piston air shaft.

6. The method for reconstruction and connection of the air duct of a subway air shaft according to claim 3 is characterized by: The side ventilation structure (12) adopts a hard shed body with a rainproof vent (121) on the side and a sprinkler system (123) on the top, and a water retaining sill (122) is left at the bottom of the rainproof vent (121), and the hard shed body cover is arranged on the top of the piston air shaft.

7. The method for reconstruction and connection of the air duct of a subway air shaft according to claim 1 is characterized by: The width of the gap between the retaining wall (101) and the inner wall of the original air shaft (10) is 400 mm, the thickness of the retaining wall (101) is 200 mm, and it is built with autoclaved aerated blocks.

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