A built-in smoke exhaust machine room based on a subway portal pipe jacking shaft

Abstract

This utility model relates to the field of subway engineering technology, specifically disclosing a built-in smoke exhaust fan room based on a subway entrance / exit pipe jacking shaft. It includes an entrance / exit pipe jacking channel, a launching shaft, a receiving shaft, and a built-in smoke exhaust fan room. The two ends of the entrance / exit pipe jacking channel are connected to the launching shaft and the receiving shaft, respectively. An underground smoke exhaust fan room is formed inside the launching shaft. The smoke exhaust fan room includes a smoke exhaust fan, a mezzanine slab, and a launching shaft top slab. The mezzanine slab has a first smoke exhaust hole and a table-shaped frame structural column. A fan foundation and a second smoke exhaust hole are provided on the table-shaped frame structural plate supported by the table-shaped frame structural column to support the smoke exhaust fan. The launching shaft top slab has a third smoke exhaust hole and a ground smoke exhaust hole well. Smoke exhaust ducts pass through each smoke exhaust hole, connecting the ground, the smoke exhaust fan, and the entrance / exit channel. The smoke exhaust fan room is centrally located relative to the entrance / exit channel. This utility model uses pipe jacking for underground excavation to avoid open-cut excavation, makes full use of abandoned shafts, avoids resource waste, improves smoke exhaust efficiency, saves investment, and optimizes the urban landscape.

Description

Technical Field

[0001] This utility model relates to the field of subway engineering technology, specifically to a built-in smoke exhaust machine room based on the pipe jacking shaft of a subway entrance. Background Technology

[0002] In the construction of open-cut tunnels for subway station entrances and exits, when the tunnel needs to cross a road, the traditional construction method is to drive retaining piles and then excavate the entire tunnel. This traditional method requires blocking part of the road, causing vehicles traveling on the original surface road to be diverted to other routes; in addition, underground pipelines need to be relocated, resulting in large project investments, long construction periods, and significant impacts on urban operations.

[0003] To solve the above problems, the pipe jacking method can be used for underground excavation. Starting and receiving wells are set up in the green belts or open spaces on both sides of the road. The entrance and exit passages are constructed underground by jacking the pipes. However, after the pipe jacking passage is completed, the starting and receiving wells need to be backfilled, which results in a lot of time and labor costs, which is not only inefficient but also wastes resources.

[0004] In addition, the smoke exhaust rooms at the entrances and exits of existing subway stations are usually located on the ground behind the ground pavilion, which affects the urban landscape; and the smoke from the entire passage is discharged to the ground through a single unidirectional smoke exhaust pipe, resulting in a long smoke exhaust pipe with a large cross-section and low smoke exhaust efficiency. Summary of the Invention

[0005] To address the problems of traditional open-cut subway stations requiring road closures, abandoned starting and receiving shafts in pipe jacking excavation, and low smoke extraction efficiency in traditional smoke extraction rooms, this utility model proposes a built-in smoke extraction room based on the vertical shaft of a subway entrance / exit. The solution is as follows: An internal smoke exhaust fan room based on a subway entrance / exit pipe jacking shaft includes an entrance / exit pipe jacking channel, with a launching shaft and a receiving shaft connected to both ends of the entrance / exit pipe jacking channel, respectively. The launching shaft forms a smoke exhaust fan room located underground. The smoke exhaust fan room includes a smoke exhaust fan, a launching shaft top plate located above, and a mezzanine plate located below. A desktop structure is provided on the mezzanine plate for mounting the smoke exhaust fan. The smoke exhaust duct above the smoke exhaust fan passes through a third smoke exhaust hole and connects to the ground. The smoke inlet duct below the smoke exhaust fan passes through a first smoke exhaust hole and extends into the passages on both sides.

[0006] Furthermore, the desktop structure includes desktop structural columns and desktop structural panels. The desktop structural columns are located on the mezzanine to support the desktop structural panels. The desktop structural panels are provided with fan foundations and a second smoke exhaust port. The smoke exhaust fan passes through the second smoke exhaust port and is placed on the fan foundation.

[0007] Furthermore, the top plate of the launching well is provided with a third smoke exhaust hole and a ground smoke exhaust hole well. The smoke exhaust duct passes through the third smoke exhaust hole and is connected to the ground smoke exhaust hole well. The ground smoke exhaust hole well is located in the green belt and is higher than the ground. A fall protection net is installed on the ground smoke exhaust hole well.

[0008] Furthermore, the well wall of the launching well is provided with two annular tongues and grooves, one of which is located at the top to connect the well wall of the launching well to the top plate of the launching well, and the other of which is located at the bottom to connect the well wall of the launching well to the sandwich plate.

[0009] Furthermore, the tongue and groove joint is a stepped ring beam structure with the upper ring diameter being larger than the lower ring diameter. The interface size between the top plate of the launching well and the sandwich plate corresponds to the tongue and groove joint size, and the interface matching is achieved through the stepped contour.

[0010] Furthermore, the first smoke exhaust hole is located on the sandwich panel, and the smoke inlet duct extends downward through the first smoke exhaust hole into the internal space of the entrance and exit channel. The smoke inlet duct is arranged in a bidirectional branching pattern within the channel, connecting the two sides of the entrance and exit channel respectively, forming smoke inlet ducts distributed along both sides of the channel.

[0011] Compared with the prior art, the advantages of this utility model are as follows: This utility model uses pipe jacking and underground excavation to achieve the entrance and exit passage crossing the road, avoiding the problems of road closures and relocation of underground pipelines required for open-cut stations.

[0012] This utility model fully utilizes the underground space and structural foundation of the starting shaft, transforming it into an underground smoke exhaust fan room. It eliminates the need for additional surface land resources, efficiently utilizing existing resources and avoiding the labor, material, and time costs associated with shaft backfilling. A tongue-and-groove structure is installed in the starting shaft wall to reliably connect the wall to the top slab and mezzanine slab. The mezzanine slab, located below, contains smoke exhaust vents and a table-shaped frame structure supporting the smoke exhaust fan. A smoke inlet duct connects the smoke exhaust fan room to the entrance / exit passage. The top slab of the starting shaft, located above, has smoke exhaust vents, which are connected to the ground-level smoke exhaust vent well via smoke exhaust ducts. The ground-level smoke exhaust vent well is located within a green belt, above ground level for flood prevention. Anti-fall nets are installed at the smoke exhaust outlets, preventing unauthorized access. This effectively optimizes the impact of traditional above-ground smoke exhaust fan rooms on the urban landscape.

[0013] The smoke exhaust room is located in the shaft between the horizontal passage and the inclined lifting passage. It is centrally located relative to the entrance and exit passage plane, and the smoke inlet duct extends into both sides of the entrance and exit passage through the smoke exhaust hole, presenting a two-way branching layout. This shortens the smoke transmission path and avoids the problems of high smoke exhaust resistance, long exhaust pipe and increased cross-section caused by traditional one-way long-distance smoke exhaust. It also reduces the net height of the entrance and exit passage and significantly improves smoke exhaust efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the pipe jacking method according to an embodiment of this utility model; Figure 2 This is a plan view of the starting well passage layer according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the smoke extraction machine room at the starting well, according to an embodiment of this utility model. Figure 4 This is a schematic diagram of the interlayer of the starting well in an embodiment of this utility model; Figure 5 This is a longitudinal sectional view of the smoke exhaust fan room built into the entrance passage of this utility model embodiment; In the above figures: 1. Entrance / exit pipe jacking channel; 2. Launching shaft; 21. Tongue and groove joint; 22. Mezzanine slab; 221. First smoke exhaust vent; 222. Table frame structural column; 23. Table frame structural slab; 231. Fan foundation; 232. Second smoke exhaust vent; 24. Launching shaft top slab; 241. Third smoke exhaust vent; 242. Ground smoke exhaust vent well; 243. Fall protection net; 25. Smoke exhaust fan; 261. Smoke inlet duct; 262. Smoke exhaust duct; 27. Launching shaft wall; 3. Receiving shaft; 4. Open-cut entrance / exit horizontal passage; 5. Open-cut entrance / exit inclined lifting passage; 6. Retaining piles. Detailed Implementation

[0015] To facilitate understanding of this utility model by those skilled in the art, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0016] like Figure 1 , 2 As shown, this utility model proposes a built-in smoke exhaust machine room based on the pipe jacking shaft of a subway entrance. The entrance passage crosses the road through the pipe jacking method, avoiding the problems of ground road traffic diversion and underground pipeline relocation caused by open excavation. Specifically, the two ends of the entrance and exit pipe jacking channel 1 are connected to the launching shaft 2 and the receiving shaft 3 respectively. The launching shaft 2 and the receiving shaft 3 are located in the green belt or open space on both sides of the road. The outer perimeter is equipped with retaining piles 6 to ensure structural stability. The smoke exhaust machine room is built into the vertical shaft of the launching shaft 2 and is located underground. After the construction is completed, the pipe jacking machine and its supporting equipment are lifted out by the receiving shaft 3. The receiving shaft 3 will be used to place communication cables later, avoiding the backfilling of the launching shaft 2 and the receiving shaft 3 after the construction is completed, reducing labor, material and time costs, realizing the secondary use of resources and saving civil engineering resources.

[0017] like Figure 3 , 4As shown, the smoke exhaust room consists of an upper launching shaft top plate 24, a smoke exhaust fan 25, an internal table-type frame structure, and a mezzanine plate 22. Two tongue-and-groove joints 21 are provided on the wall of the launching shaft to connect the wall 27 of the launching shaft to the upper launching shaft top plate 24 and the lower mezzanine plate 22, respectively. The tongue-and-groove joint 21 is a stepped ring beam structure, with the diameter of the upper ring being larger than that of the lower ring. The interface size between the launching shaft top plate 24 and the mezzanine plate 22 corresponds to the size of the tongue-and-groove joint 21. The tongue-and-groove joint 21 is reserved with steel bars and steel bar connectors to provide conditions for the later pouring of the mezzanine plate and the launching shaft top plate, thus achieving interface matching.

[0018] Specifically, a table-shaped frame structural column 222 and a first smoke exhaust port 221 are set on the mezzanine. The table-shaped frame structural column supports the table-shaped frame structural plate 23. The table-shaped frame structural plate is provided with a fan foundation 231 and a second smoke exhaust port 232. The smoke exhaust fan 25 passes through the second smoke exhaust port and sits on the fan foundation 231. The smoke inlet duct 261 below the smoke exhaust fan 25 passes through the first smoke exhaust port 221 and extends into the entrance and exit channel, presenting a bidirectional branching layout, connecting the two sides of the entrance and exit channel respectively, forming a smoke inlet duct distributed along both sides of the channel.

[0019] The top slab of the launching shaft is equipped with a third smoke exhaust port 241. The smoke exhaust duct 262 above the smoke exhaust fan 25 passes through the third smoke exhaust port 241 and connects to the ground smoke exhaust port 242 to form a smoke exhaust pipeline. The ground smoke exhaust port 242 is located in the green belt and is higher than the ground to meet the flood prevention requirements. A fall protection net 243 is installed on the ground smoke exhaust port 242, which is not opened by non-staff members to prevent people from falling. The shaft wall 27 above the top slab of the launching shaft will be demolished later to reduce the occupation of ground structures. Only a smoke exhaust port remains on the ground of the built-in smoke exhaust fan room, which effectively optimizes the impact of traditional ground smoke exhaust fan rooms on the urban landscape, makes full use of the launching shaft that was originally to be abandoned, improves the utilization rate of existing resources, and reduces investment.

[0020] like Figure 5 As shown, the smoke exhaust room is located in the shaft between the open-cut entrance / exit horizontal passage 4 and the open-cut entrance / exit inclined lifting passage 5. The smoke inlet duct 261 has a bidirectional branch structure in the passage, which can exhaust the smoke from both ends of the passage to the middle, shortening the smoke transmission path. Moreover, the smoke exhaust room is set in the center of the plane relative to the entrance / exit passage, which reduces the cross-sectional area of ​​the duct, thereby reducing the net height of the entrance / exit passage. This avoids the problems of high smoke exhaust resistance and long exhaust pipe with large cross-section caused by traditional unidirectional long-distance smoke exhaust, and significantly improves the smoke exhaust efficiency.

[0021] The above describes one embodiment of the present utility model in detail. However, the content described is only a preferred embodiment of the present utility model and should not be considered as limiting the scope of the present utility model. All equivalent changes and improvements made in accordance with the scope of the present utility model application should still fall within the patent coverage of the present utility model.

Claims

1. A built-in smoke exhaust fan room based on a subway entrance / exit pipe jacking shaft, comprising an entrance / exit pipe jacking channel (1), wherein the two ends of the entrance / exit pipe jacking channel (1) are respectively connected to a launching shaft (2) and a receiving shaft (3), characterized in that, The starting shaft (2) forms a smoke exhaust fan room, which is located underground. The smoke exhaust fan room includes a smoke exhaust fan (25), a starting shaft top plate (24) located above, and a mezzanine plate (22) located below. A desktop structure is provided on the mezzanine plate (22) to house the smoke exhaust fan (25). The smoke exhaust duct (262) above the smoke exhaust fan (25) passes through the third smoke exhaust hole (241) and connects to the ground. The smoke inlet duct (261) below the smoke exhaust fan (25) passes through the first smoke exhaust hole (221) and extends into the passages on both sides.

2. The built-in smoke exhaust fan room based on the pipe jacking shaft of a subway entrance / exit as described in claim 1, characterized in that, The desktop structure includes a desktop structural column (222) and a desktop structural plate (23). The desktop structural column (222) is located on the sandwich panel (22) to support the desktop structural plate (23). The desktop structural plate (23) is provided with a fan foundation (231) and a second smoke exhaust hole (232). The smoke exhaust fan (25) passes through the second smoke exhaust hole (232) and is placed on the fan foundation (231).

3. The built-in smoke exhaust fan room based on the pipe jacking shaft of a subway entrance / exit as described in claim 1, characterized in that, The top plate (24) of the starting well is provided with a third smoke exhaust hole (241) and a ground smoke exhaust hole well (242). The smoke exhaust duct (262) passes through the third smoke exhaust hole (241) and is connected to the ground smoke exhaust hole well (242). The ground smoke exhaust hole well (242) is located in the green belt and is higher than the ground. A fall protection net (243) is installed on the ground smoke exhaust hole well (242).

4. The built-in smoke exhaust fan room based on the pipe jacking shaft of a subway entrance / exit as described in claim 1, characterized in that, The well wall (27) of the launching well is provided with two rings of tongue and groove (21). One ring of the tongue and groove (21) is located on the top to connect the well wall (27) of the launching well to the top plate (24) of the launching well. The other ring of the tongue and groove (21) is located on the bottom to connect the well wall (27) of the launching well to the sandwich plate (22).

5. A built-in smoke exhaust fan room based on a subway entrance / exit pipe jacking shaft according to claim 4, characterized in that, The tongue and groove (21) is a stepped ring beam structure with the upper ring diameter being larger than the lower ring diameter. The interface size between the starting well top plate (24) and the sandwich plate (22) corresponds to the size of the tongue and groove (21), and the interface matching is achieved through the stepped contour.

6. A built-in smoke exhaust fan room based on a subway entrance / exit pipe jacking shaft according to claim 1, characterized in that, The first smoke exhaust hole (221) is located on the sandwich plate (22). The smoke inlet duct (261) passes through the first smoke exhaust hole (221) and extends downward into the internal space of the entrance and exit channel. The smoke inlet duct (261) is arranged in a bidirectional branching layout in the channel, connecting the two sides of the entrance and exit channel respectively, forming a smoke inlet duct distributed along both sides of the channel.

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