Subway tunnel middle air shaft structure suitable for urban dense area

Abstract

The application discloses a kind of subway tunnel middle air shaft structures suitable for urban dense area, including double circle open caisson type middle air shaft (1), piston air duct and fan;Double circle open caisson type middle air shaft is constructed between subway tunnel layer and ground by double circle blade foot section and open caisson main body structure, piston air duct includes ascending piston air duct (201) and descending piston air duct (202) and is constructed in double circle open caisson type middle air shaft, ascending piston air duct is connected with ground the ascending line (401) of subway tunnel layer, descending piston air duct is connected with ground the descending line (402) of subway tunnel layer;Fan includes ascending fan (301) and descending fan (302), ascending fan is arranged in ascending piston air duct, descending fan is arranged in descending piston air duct.The application can solve the problems of long construction period, high cost and large construction area occupation of open excavation, and large disturbance to surrounding environment of open caisson method and air shaft limited to circular structure.

Description

TECHNICAL FIELD

[0001] The present application relates to a wind shaft structure, in particular to a subway tunnel intermediate wind shaft structure suitable for urban dense areas. BACKGROUND

[0002] With the continuous acceleration of urbanization process in China and the rapid increase of urban population density, urban land resources are increasingly scarce. And subway tunnel construction is often in the dense area of buildings, roads and underground pipelines and other facilities, so choosing shield method for subway tunnel construction has become a trend. Subway tunnel generally needs to build an intermediate wind shaft to establish spatial connection with the ground at a distance to meet the requirements of ventilation, cable, maintenance and other requirements.

[0003] Due to the small space available for construction in urban dense areas, the construction of subway tunnel intermediate wind shaft by open cut method occupies a large construction area, which cannot meet the space requirements, and the open cut method has a long construction period and high cost. The traditional caisson method for constructing subway tunnel intermediate wind shaft has a large disturbance to the surrounding environment. The VSM method for constructing subway tunnel intermediate wind shaft is limited to circular structure, and the space utilization rate of the wind shaft structure is low and uneconomical for the wind shaft structure needing to pass through both sides. Therefore, a subway tunnel intermediate wind shaft structure suitable for urban dense areas is needed to solve the problems of long construction period, high cost and large construction area of open cut construction, and large disturbance to the surrounding environment of caisson method and limitation of wind shaft to circular structure. SUMMARY

[0004] The purpose of the present application is to provide a subway tunnel intermediate wind shaft structure suitable for urban dense areas, which can solve the problems of long construction period, high cost and large construction area of open cut construction, and large disturbance to the surrounding environment of caisson method and limitation of wind shaft to circular structure.

[0005] The present application is implemented as follows:

[0006] A subway tunnel intermediate wind shaft structure suitable for urban dense areas, comprising a double-circle caisson type intermediate wind shaft, a piston air duct and a fan; the double-circle caisson type intermediate wind shaft is constructed between the subway tunnel layer and the ground through a double-circle blade foot section and a caisson main body structure, the piston air duct comprises an upward piston air duct and a downward piston air duct, the upward piston air duct and the downward piston air duct are respectively constructed in the double-circle caisson type intermediate wind shaft, and the upward piston air duct communicates the upward line of the subway tunnel layer with the ground, and the downward piston air duct communicates the downward line of the subway tunnel layer with the ground; the fan comprises an upward fan and a downward fan, the upward fan is arranged in the upward piston air duct, and the downward fan is arranged in the downward piston air duct.

[0007] The double-circle caisson type intermediate air shaft is a first double-circle caisson structure, which is composed of two intersecting and communicating circular caissons; the first double-circle caisson structure is constructed between the subway tunnel layer and the ground in several layers, the uplink piston air duct and the downlink piston air duct are arranged in the first double-circle caisson structure through the air holes of each layer, and the uplink fan and the downlink fan are respectively arranged in two layers of the first double-circle caisson structure, so that the uplink piston air duct and the downlink piston air duct are staggered.

[0008] The top of the first double-circle caisson structure is constructed with two first piston air wells, so that the upper ends of the uplink piston air duct and the downlink piston air duct are respectively communicated with the two first piston air wells; the side of the uplink line away from the downlink line is formed with a first piston air hole, and the side of the downlink line away from the uplink line is formed with a second piston air hole, so that the lower ends of the uplink piston air duct and the downlink piston air duct are respectively communicated with the first piston air hole and the second piston air hole.

[0009] The double-circle caisson type intermediate air shaft is a second double-circle caisson structure + a shallow external hanging structure, the second double-circle caisson structure is composed of two intersecting and communicating circular caissons, and the shallow external hanging structure is constructed by open excavation on one side of the double-circle caisson structure; the second double-circle caisson structure is constructed between the subway tunnel layer and the ground in several layers, the shallow external hanging structure is communicated with the first underground layer and the second underground layer of the second double-circle caisson structure; the uplink piston air duct and the downlink piston air duct are arranged in the second double-circle caisson structure through the air holes of each layer, and the uplink fan and the downlink fan are respectively arranged in two layers of the second double-circle caisson structure, so that the uplink piston air duct and the downlink piston air duct are staggered.

[0010] The centers of the two circular caissons of the second double-circle caisson structure are respectively aligned with the centers of the uplink line and the downlink line.

[0011] The shallow external hanging structure is constructed with a second piston air well and a third piston air well; the second piston air well is communicated with the first underground layer of the second double-circle caisson structure, the downlink fan is arranged in the first underground layer of the second double-circle caisson structure, the side of the downlink line away from the uplink line is formed with a third piston air hole, the lower end of the downlink piston air duct is communicated with the downlink line through the third piston air hole, and the upper end of the downlink piston air duct is communicated with the second piston air well; the third piston air well is communicated with the second underground layer of the second double-circle caisson structure, the uplink fan is arranged in the second underground layer of the second double-circle caisson structure, the side of the uplink line close to the downlink line is formed with a fourth piston air hole, the lower end of the uplink piston air duct is communicated with the uplink line through the fourth piston air hole, and the upper end of the uplink piston air duct is communicated with the third piston air well.

[0012] The third double-circle caisson structure is constructed between the subway tunnel layer and the ground in several layers, the uplink piston air duct and the downlink piston air duct are vertically arranged in the third double-circle caisson structure through the air holes of each layer, and the uplink fan and the downlink fan are vertically arranged in the uplink piston air duct and the downlink piston air duct respectively, so that the uplink piston air duct and the downlink piston air duct are arranged in parallel.

[0013] The centers of the two circular caissons of the third double-circle caisson structure are respectively aligned with the centers of the uplink line and the downlink line.

[0014] The top of the third double-circle caisson structure is formed with a fourth piston air shaft and a fifth piston air shaft on two sides respectively, the side of the downlink line away from the uplink line is formed with a fifth piston air hole, and the side of the uplink line away from the downlink line is formed with a sixth piston air hole, so that the uplink piston air duct is vertically located on one side of the third double-circle caisson structure, the lower end of the uplink piston air duct is connected to the uplink line through the sixth piston air hole, the upper end of the uplink piston air duct is connected to the ground through the fourth piston air shaft, the downlink piston air duct is vertically located on the other side of the third double-circle caisson structure, the lower end of the downlink piston air duct is connected to the downlink line through the fifth piston air hole, and the upper end of the downlink piston air duct is connected to the ground through the fifth piston air shaft.

[0015] The fourth piston air shaft and the fifth piston air shaft are respectively located directly above the uplink line and the downlink line, or the fourth piston air shaft and the fifth piston air shaft are respectively constructed on the outer side of the uplink line and the downlink line through shallow open excavation.

[0016] The double-circle blade foot section and caisson main body structure comprises a first blade foot section and caisson main body, a second blade foot section and caisson main body, pressing-in equipment, earth excavation equipment, cross beams, seagull blocks and internal supports; the first blade foot section and caisson main body and the second blade foot section and caisson main body are both open circular ring structures, the open ends of the first blade foot section and caisson main body and the second blade foot section and caisson main body are respectively symmetrically spliced through the seagull blocks on both sides, forming a double-circle structure matched with the double-circle caisson type intermediate air shaft; the two seagull blocks are supported and connected through the internal supports; the pressing-in equipment is arranged on the outside of the double-circle structure in intervals; the cross beams are arranged in the first blade foot section and caisson main body and the second blade foot section and caisson main body respectively; and the earth excavation equipment is arranged in the centers of the cross beams.

[0017] The centers of the two cross beams are respectively aligned with the centers of the first blade foot section and caisson main body and the second blade foot section and caisson main body, and the two cross beams, the first blade foot section and caisson main body and the second blade foot section and caisson main body are symmetrically distributed about the internal supports; the double-circle structure is divided into eight excavation areas by the two cross beams and the internal supports.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1、The present application adopts the double-circle caisson type intermediate air shaft, and the double-circle caisson type intermediate air shaft is prefabricated through the first blade foot section and the caisson body and the second blade foot section and the caisson body, which breaks the problem that the VSM construction method is limited to a circular structure, and eight excavation areas are formed in the double-circle structure through the cross beam and the internal support, so that the partition excavation is carried out, the disturbance to the surrounding building structure and the soil is reduced to the maximum extent, the problem of large disturbance to the surrounding environment caused by the traditional caisson construction is solved, and the construction safety is improved.

[0020] 2、The present application combines the double-circle caisson structure and the shallow external hanging structure, can greatly reduce the occupation of the ground space by the open excavation construction, has high space utilization, reduces the construction cost, is beneficial to shorten the construction period, improves the construction efficiency while ensuring the construction safety, and has good universality and is not limited by the construction site and the construction condition. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a plane construction drawing of an underground third floor of a first double-circle caisson structure suitable for a subway tunnel intermediate air shaft structure in a city dense area according to the present application;

[0022] Figure 2 is a plane construction drawing of an underground fourth floor of a first double-circle caisson structure suitable for a subway tunnel intermediate air shaft structure in a city dense area according to the present application;

[0023] Figure 3 is a ventilation arrangement schematic view of a first double-circle caisson structure suitable for a subway tunnel intermediate air shaft structure in a city dense area according to the present application; in the drawing, the arrow direction is the ventilation direction;

[0024] Figure 4 is a plane construction drawing of an underground first floor of a second double-circle caisson structure suitable for a subway tunnel intermediate air shaft structure in a city dense area according to the present application;

[0025] Figure 5 is a plane construction drawing of an underground second floor of a second double-circle caisson structure suitable for a subway tunnel intermediate air shaft structure in a city dense area according to the present application;

[0026] Figure 6 is a ventilation arrangement schematic view of a second double-circle caisson structure suitable for a subway tunnel intermediate air shaft structure in a city dense area according to the present application; in the drawing, the arrow direction is the ventilation direction;

[0027] Figure 7is the construction plan of the shallow outer hanging structure of the intermediate air shaft structure of the subway tunnel suitable for the urban dense area of the present application;

[0028] Figure 8 is the plan construction drawing of the third double circle open caisson structure of the intermediate air shaft structure of the subway tunnel suitable for the urban dense area of the present application;

[0029] Figure 9 is the elevation construction drawing of the third double circle open caisson structure of the intermediate air shaft structure of the subway tunnel suitable for the urban dense area of the present application (the fourth piston air shaft and the fifth piston air shaft are located directly above the uplink and downlink respectively);

[0030] Figure 10 is the elevation construction drawing of the third double circle open caisson structure of the intermediate air shaft structure of the subway tunnel suitable for the urban dense area of the present application (the fourth piston air shaft and the fifth piston air shaft are located on the two sides above the uplink and downlink respectively);

[0031] Figure 11 is the plan layout drawing of the double circle blade foot section and open caisson main structure of the intermediate air shaft structure of the subway tunnel suitable for the urban dense area of the present application.

[0032] In the figure, 1 is a double circle open caisson type intermediate air shaft, 101 is a first piston air shaft, 102 is a shallow outer hanging structure, 103 is a second piston air shaft, 104 is a third piston air shaft, 105 is a fourth piston air shaft, 106 is a fifth piston air shaft, 201 is an uplink piston air duct, 202 is a downlink piston air duct, 301 is an uplink air fan, 302 is a downlink air fan, 401 is a first piston air hole, 402 is a second piston air hole, 403 is a third piston air hole, 404 is a fourth piston air hole, 405 is a fifth piston air hole, 406 is a sixth piston air hole, 501 is a first blade foot section and open caisson main body, 502 is a second blade foot section and open caisson main body, 503 is a pressing equipment, 504 is a earthmoving equipment, 505 is a cross beam, 506 is a seagull block, 507 is an internal support. DETAILED DESCRIPTION

[0033] The present application will be further described below in combination with the drawings and specific embodiments.

[0034] Please refer to the drawings Figure 3 , the drawings Figure 6 and the drawings Figure 9The utility model relates to a kind of subway tunnel middle air shaft structures suitable for urban dense area, including double circle sinking well type middle air shaft 1, piston air duct and fan;Double circle sinking well type middle air shaft 1 is constructed between subway tunnel layer and ground by double circle blade foot section and sinking well main body structure, piston air duct includes uplink piston air duct 201 and downlink piston air duct 202, uplink piston air duct 201 and downlink piston air duct 202 are respectively constructed in double circle sinking well type middle air shaft 1, and uplink piston air duct 201 is connected with ground the uplink line 401 of subway tunnel layer, downlink piston air duct 202 is connected with ground the downlink line 402 of subway tunnel layer;Fan includes uplink fan 301 and downlink fan 302, uplink fan 301 is set in uplink piston air duct 201, and downlink fan 302 is set in downlink piston air duct 202.

[0035] Double circle sinking well type middle air shaft 1 is constructed by double circle blade foot section and sinking well main body structure, is not limited to circular sinking well form, meets the construction requirement of subway tunnel middle air shaft.Double circle sinking well type middle air shaft 1 is constructed using sinking well process, avoids the problem that open cut construction occupies large ground space, is favorable to improve construction space utilization, reduce cost, to ensure construction progress.

[0036] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 3 , the double circle sinking well type middle air shaft 1 is first double circle sinking well structure, and first double circle sinking well structure is composed of two intersecting and communicating circular sinking wells;First double circle sinking well structure is constructed between subway tunnel layer and ground in several layers, and uplink piston air duct 201 and downlink piston air duct 202 are arranged in first double circle sinking well structure through the air hole of each layer respectively, and uplink fan 301 and downlink fan 302 are arranged in two layers of first double circle sinking well structure respectively, so that uplink piston air duct 201 and downlink piston air duct 202 are staggered.

[0037] The construction depth and number of layers of first double circle sinking well structure can be determined according to the construction depth of subway tunnel layer, and the air hole is arranged in each layer of first double circle sinking well structure to form uplink piston air duct 201 and downlink piston air duct 202, and uplink piston air duct 201 and downlink piston air duct 202 can be separated by partition in the same layer, to ensure that uplink line 401 and downlink line 402 are independently and efficiently ventilated by uplink fan 301 and downlink fan 302.The setting position of uplink fan 301 and downlink fan 302 can be selected according to actual construction demand, and other functional components such as emergency air hole can be arranged in first double circle sinking well structure.

[0038] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 3The first piston air shaft 101 is constructed on the top of the first double-circle caisson structure, and the upper ends of the staggered upper piston air duct 201 and lower piston air duct 202 are respectively communicated with the two first piston air shafts 101; the first piston air hole 403 is formed on the side of the upper line 401 away from the lower line 402, and the second piston air hole 404 is formed on the side of the lower line 402 away from the upper line 401, so that the lower ends of the staggered upper piston air duct 201 and lower piston air duct 202 are respectively communicated with the first piston air hole 403 and the second piston air hole 404.

[0039] The first piston air shaft 101 can be constructed on the ground by open excavation process, which greatly reduces the occupation of the ground space compared with the first double-circle caisson structure constructed by open excavation. Embodiment

[0040] Please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 3 The diameter of the circular caisson of the first double-circle caisson structure is about 16m, and the planar size is about 17.6*29.6m. The net distance between the upper line 401 and the lower line 402 is 5.8m. The first double-circle caisson structure is divided into five underground layers. The upper air fan 301 is arranged in the fourth underground layer of the first double-circle caisson structure, and the lower air fan 302 is arranged in the third underground layer of the first double-circle caisson structure. The upper line 401 is connected to the vertically arranged first piston air shaft 101 through the upper piston air duct 201 and the upper air fan 301 arranged in the fourth underground layer, and leads to the ground; the lower line 402 is connected to the vertically arranged first piston air shaft 101 through the lower piston air duct 202 and the lower air fan 302 arranged in the third underground layer, and leads to the ground.

[0041] Please refer to the accompanying drawings Figure 4 to the accompanying drawings Figure 7 The double-circle caisson type intermediate air shaft 1 is a second double-circle caisson structure + shallow external structure 102. The second double-circle caisson structure is composed of two intersecting and communicating circular caissons, and the shallow external structure 102 is constructed by open excavation on one side of the double-circle caisson structure. The second double-circle caisson structure is constructed between the subway tunnel layer and the ground in several layers, and the shallow external structure 102 is communicated with the first underground layer and the second underground layer of the second double-circle caisson structure. The upper piston air duct 201 and the lower piston air duct 202 are arranged in the second double-circle caisson structure through the air holes of each layer, and the upper air fan 301 and the lower air fan 302 are arranged in two layers of the second double-circle caisson structure, so that the upper piston air duct 201 and the lower piston air duct 202 are staggered.

[0042] The construction depth and the number of layers of the second double-circle caisson structure can be determined according to the construction depth of the subway tunnel layer, and air holes are arranged in each layer of the second double-circle caisson structure to form the upward piston air duct 201 and the downward piston air duct 202, and the upward piston air duct 201 and the downward piston air duct 202 can be separated by a partition plate in the same layer to ensure that the upward line 401 and the downward line 402 are independently and efficiently ventilated by the upward fan 301 and the downward fan 302. The setting positions of the upward fan 301 and the downward fan 302 can be selected according to actual construction requirements, and other functional components such as an emergency air hole can be arranged in the second double-circle caisson structure. The shallow outer hanging structure 102 is constructed by the open excavation method on one side of the second double-circle caisson structure, which can minimize the occupation of the ground space by the open excavation construction and meet the construction requirements of the intermediate air shaft of different subway tunnel structures.

[0043] Please refer to the accompanying drawings Figure 4 to the accompanying drawings Figure 7 , the shallow outer hanging structure 102 has a second piston air shaft 103 and a third piston air shaft 104 constructed therein; the second piston air shaft 103 is communicated with the first underground layer of the second double-circle caisson structure, the downward fan 302 is arranged in the first underground layer of the second double-circle caisson structure, the third piston air hole 405 is formed on the side of the downward line 402 away from the upward line 401, the lower end of the downward piston air duct 202 is communicated with the downward line 402 through the third piston air hole 405, and the upper end of the downward piston air duct 202 is communicated with the second piston air shaft 103; the third piston air shaft 104 is communicated with the second underground layer of the second double-circle caisson structure, the upward fan 301 is arranged in the second underground layer of the second double-circle caisson structure, the fourth piston air hole 406 is formed on the side of the upward line 401 close to the downward line 402, the lower end of the upward piston air duct 201 is communicated with the upward line 401 through the fourth piston air hole 406, and the upper end of the upward piston air duct 201 is communicated with the third piston air shaft 104.

[0044] The second piston air shaft 103 and the third piston air shaft 104 are constructed by the open excavation method, which greatly reduces the occupation of the ground space compared with the open excavation construction of the second double-circle caisson structure.

[0045] Please refer to the accompanying drawings Figure 4 to the accompanying drawings Figure 7 , the centers of the two circular caissons of the second double-circle caisson structure are respectively aligned with the centers of the upward line 401 and the downward line 402. Embodiment

[0046] Please refer to the accompanying drawings Figure 4 to the accompanying drawings Figure 7, the inner diameter of the circular shaft of the second double-circle shaft structure is about 14.6 m, and the planar size is 16.2*26.7 m; the second double-circle shaft structure is arranged in five to six underground layers, the downward fan 302 is arranged in the first underground layer of the second double-circle shaft structure, and the upward fan 301 is arranged in the second underground layer of the second double-circle shaft structure; the clear distance between the upward line 401 and the downward line 402 is 4 m, and the centers of the two circular shafts of the second double-circle shaft structure are respectively aligned with the centers of the upward line 401 and the downward line 402.

[0047] According to the actual needs of the construction site, the shallow layer can be longitudinally expanded for setting the fan layer. The shallow layer outer hanging structure 102 is transversely expanded by open excavation, and the fan layer is set, so that the second piston wind shaft 103 communicates with the first underground layer of the second double-circle shaft structure, and the third piston wind shaft 104 communicates with the second underground layer of the second double-circle shaft structure; the total size of the ground occupation is 16.2*32.6 m.

[0048] The air exhaust arrangement is as follows: the upward line 401 enters the upward fan 301 arranged in the second underground layer through the air holes of the second double-circle shaft structure from the second underground layer to the fifth underground layer, and then enters the third piston wind shaft 104 arranged vertically to the ground; the downward line 402 enters the downward fan 302 arranged in the first underground layer through the air holes of the first double-circle shaft structure from the first underground layer to the fifth underground layer, and then enters the second piston wind shaft 103 arranged vertically to the ground.

[0049] Please refer to the accompanying drawings Figure 8 to the accompanying drawings Figure 10 , the double-circle shaft type intermediate wind shaft 1 is a third double-circle shaft structure, the third double-circle shaft structure is composed of two intersecting and communicating circular shafts; the third double-circle shaft structure is constructed between the subway tunnel layer and the ground in several layers, the upward piston air duct 201 and the downward piston air duct 202 are vertically arranged in the third double-circle shaft structure through the air holes of each layer, and the upward fan 301 and the downward fan 302 are vertically arranged in the upward piston air duct 201 and the downward piston air duct 202 respectively, so that the upward piston air duct 201 and the downward piston air duct 202 are arranged in parallel.

[0050] The construction depth and the number of layers of the third double-circle shaft structure can be determined according to the construction depth of the subway tunnel layer, the air holes are arranged in each layer of the third double-circle shaft structure to form the upward piston air duct 201 and the downward piston air duct 202, and the upward piston air duct 201 and the downward piston air duct 202 can be separated by a partition plate in the same layer to ensure that the upward line 401 and the downward line 402 are independently and efficiently exhausted through the upward fan 301 and the downward fan 302. The setting positions of the upward fan 301 and the downward fan 302 can be selected according to actual construction needs, and other functional components such as emergency air holes can be arranged in the third double-circle shaft structure.

[0051] Please refer to the attached Figure 8 to the attached Figure 10 , the fourth piston air shaft 105 and the fifth piston air shaft 106 are formed on the top of the third double-circle caisson structure, the fifth piston air hole 407 is formed on the side of the downlink 402 away from the uplink 401, and the sixth piston air hole 408 is formed on the side of the uplink 401 away from the downlink 402, so that the uplink piston air duct 201 is vertically located on one side of the third double-circle caisson structure, the lower end of the uplink piston air duct 201 is connected to the uplink 401 through the sixth piston air hole 408, and the upper end of the uplink piston air duct 201 is connected to the ground through the fourth piston air shaft 105, the downlink piston air duct 202 is vertically located on the other side of the third double-circle caisson structure, the lower end of the downlink piston air duct 202 is connected to the downlink 402 through the fifth piston air hole 407, and the upper end of the downlink piston air duct 202 is connected to the ground through the fifth piston air shaft 106.

[0052] The fourth piston air shaft 105 and the fifth piston air shaft 106 are constructed by open excavation, which greatly reduces the occupation of the ground space compared with the open excavation of the third double-circle caisson structure.

[0053] Please refer to the attached Figure 8 to the attached Figure 10 , the centers of the two circular caissons of the third double-circle caisson structure are respectively aligned with the centers of the uplink 401 and the downlink 402.

[0054] Please refer to the attached Figure 9 , the fourth piston air shaft 105 and the fifth piston air shaft 106 are respectively located directly above the uplink 401 and the downlink 402.

[0055] Please refer to the attached Figure 10 , the fourth piston air shaft 105 and the fifth piston air shaft 106 are respectively constructed by shallow open excavation above and outside the uplink 401 and the downlink 402.

[0056] According to the site construction conditions, the fourth piston air shaft 105 and the fifth piston air shaft 106 can be constructed by open excavation directly above the uplink 401 and the downlink 402, or the fourth piston air shaft 105 and the fifth piston air shaft 106 can be moved to the sides of the uplink 401 and the downlink 402. Embodiment

[0057] Please refer to the attached Figure 8 to the attached Figure 10, the inner diameter of the circular caisson of the third double-circle caisson structure is about 11.7m, and the planar size is 13.1*23.7m; the third double-circle caisson structure is arranged in five or six underground layers, the uplink piston air duct 201 and the downlink piston air duct 202 are vertically arranged at two sides of the third double-circle caisson structure, and the uplink fan 301 and the downlink fan 302 are vertically arranged in the uplink piston air duct 201 and the downlink piston air duct 202 respectively. The net distance of the uplink line 401 and the downlink line 402 is 4m, and the centers of the two circular caissons of the third double-circle caisson structure are respectively aligned with the centers of the uplink line 401 and the downlink line 402.

[0058] In the embodiment, the fourth piston air shaft 105 and the fifth piston air shaft 106 can be constructed above the uplink line 401 and the downlink line 402 respectively, or can be moved from above the uplink line 401 and the downlink line 402 to the two sides according to the site needs by using the shallow open-cut method.

[0059] Please refer to the accompanying drawings Figure 11 , the double-circle blade foot section and the caisson main body structure comprises a first blade foot section and caisson main body 501, a second blade foot section and caisson main body 502, a pressing-in device 503, a digging device 504, a cross beam 505, a seagull block 506 and an internal support 507; the first blade foot section and caisson main body 501 and the second blade foot section and caisson main body 502 are both open circular ring structures, the two sides of the open ends of the first blade foot section and caisson main body 501 and the second blade foot section and caisson main body 502 are respectively symmetrically spliced through the seagull blocks 506, forming a double-circle structure matched with the double-circle caisson type intermediate air shaft 1; the two seagull blocks 506 are supported and connected through the internal support 507; the pressing-in devices 503 are arranged at intervals outside the double-circle structure; the two cross beams 505 are arranged in the first blade foot section and caisson main body 501 and the second blade foot section and caisson main body 502 respectively, and the two digging devices 504 are arranged at the centers of the two cross beams 505.

[0060] Preferably, the pressing-in device 503 is provided with 8 devices, and 3 devices are arranged at each of the quarter arcs of the first blade foot section and caisson main body 501 and the second blade foot section and caisson main body 502. The first blade foot section and caisson main body 501, the second blade foot section and caisson main body 502, the seagull block 506 and the internal support 507 are all prefabricated according to the size requirements of the double-circle caisson type intermediate air shaft 1, and are assembled on site. The pressing-in device 503 and the digging device 504 can be selected according to the construction needs of the caisson, and the caisson construction can be carried out by using the existing caisson construction process, which will not be described here.

[0061] Please refer to the accompanying drawings Figure 11, the centers of the two cross beams 505 are respectively aligned with the centers of the first blade foot section and the caisson body 501 and the centers of the second blade foot section and the caisson body 502, and the two cross beams 505 and the first blade foot section and the caisson body 501 and the second blade foot section and the caisson body 502 are symmetrically distributed about the internal support 507.

[0062] Please refer to the attached drawings Figure 11 , the two cross beams 505 and the internal support 507 divide the double-circular structure into eight excavation areas.

[0063] Through the partition excavation of the eight excavation areas, the disturbance to the surrounding building structures and soil is minimized, and the smooth and stable sinking of the caisson is ensured.

[0064] The above only describes the preferred embodiments of the present application and is not used to limit the protection scope of the present application, and therefore, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A structure for intermediate ventilation shafts in subway tunnels suitable for densely populated urban areas, characterized by: The utility model relates to a double-circle well type intermediate air shaft (1), piston air duct and fan, the double-circle well type intermediate air shaft (1) is constructed between the subway tunnel layer and ground through double-circle blade foot section and well body structure, the piston air duct includes ascending piston air duct (201) and descending piston air duct (202), the ascending piston air duct (201) and descending piston air duct (202) are constructed in the double-circle well type intermediate air shaft (1) respectively, and the ascending piston air duct (201) is connected with the ascending line (401) of subway tunnel layer and ground, and the descending piston air duct (202) is connected with the descending line (402) of subway tunnel layer and ground, the fan includes ascending fan (301) and descending fan (302), the ascending fan (301) is arranged in the ascending piston air duct (201), and the descending fan (302) is arranged in the descending piston air duct (202), The double-circle well type intermediate air shaft (1) is a first double-circle well structure, the first double-circle well structure is composed of two intersecting and communicating circular wells, the first double-circle well structure is constructed between the subway tunnel layer and ground in several layers, the ascending piston air duct (201) and the descending piston air duct (202) are arranged in the first double-circle well structure through the air holes of each layer, and the ascending fan (301) and the descending fan (302) are arranged in two layers of the first double-circle well structure, so that the ascending piston air duct (201) and the descending piston air duct (202) are arranged alternately.

2. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 1, characterized in that: The double-circle well type intermediate air shaft (1) is a first double-circle well structure, the first double-circle well structure is composed of two intersecting and communicating circular wells, the first double-circle well structure is constructed between the subway tunnel layer and ground in several layers, the ascending piston air duct (201) and the descending piston air duct (202) are arranged in the first double-circle well structure through the air holes of each layer, and the ascending fan (301) and the descending fan (302) are arranged in two layers of the first double-circle well structure, so that the ascending piston air duct (201) and the descending piston air duct (202) are arranged alternately.

3. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 2, characterized in that: The first piston air shaft (101) is constructed on the top of the first double-circle caisson structure, and the upper ends of the staggered upper piston air duct (201) and lower piston air duct (202) are communicated with the two first piston air shafts (101) respectively; the first piston air hole (403) is formed on the side of the upper line (401) away from the lower line (402), the second piston air hole (404) is formed on the side of the lower line (402) away from the upper line (401), and the lower ends of the staggered upper piston air duct (201) and lower piston air duct (202) are communicated with the first piston air hole (403) and second piston air hole (404) respectively.

4. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 1, characterized in that: The double-circle caisson type intermediate air shaft (1) is a second double-circle caisson structure + shallow external hanging structure (102), the second double-circle caisson structure is composed of two intersecting circular caissons, and the shallow external hanging structure (102) is constructed by open excavation on one side of the double-circle caisson structure; the second double-circle caisson structure is constructed between the subway tunnel layer and the ground in several layers, the shallow external hanging structure (102) is communicated with the first underground layer and the second underground layer of the second double-circle caisson structure; the upper piston air duct (201) and the lower piston air duct (202) are arranged in the second double-circle caisson structure through the air holes of each layer, and the upper fan (301) and the lower fan (302) are arranged in two layers of the second double-circle caisson structure respectively, so that the upper piston air duct (201) and the lower piston air duct (202) are staggered. The centers of the two circular caissons of the second double-circle caisson structure are respectively aligned with the centers of the upper line (401) and the lower line (402).

5. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 4, characterized in that: The second piston air shaft (103) and the third piston air shaft (104) are constructed in the shallow external hanging structure (102); the second piston air shaft (103) is communicated with the first underground layer of the second double-circle caisson structure, the lower fan (302) is arranged in the first underground layer of the second double-circle caisson structure, the third piston air hole (405) is formed on the side of the lower line (402) away from the upper line (401), the lower end of the lower piston air duct (202) is communicated with the lower line (402) through the third piston air hole (405), and the upper end of the lower piston air duct (202) is communicated with the second piston air shaft (103); the third piston air shaft (104) is communicated with the second underground layer of the second double-circle caisson structure, the upper fan (301) is arranged in the second underground layer of the second double-circle caisson structure, the fourth piston air hole (406) is formed on the side of the upper line (401) close to the lower line (402), the lower end of the upper piston air duct (201) is communicated with the upper line (401) through the fourth piston air hole (406), and the upper end of the upper piston air duct (201) is communicated with the third piston air shaft (104).

6. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 1, characterized in that: The double-circle caisson type intermediate air shaft (1) is a third double-circle caisson structure composed of two intersecting and communicating circular caissons; the third double-circle caisson structure is constructed between a subway tunnel layer and the ground in several layers; an uplink piston air duct (201) and a downlink piston air duct (202) are vertically arranged in the third double-circle caisson structure through air holes of each layer, and an uplink fan (301) and a downlink fan (302) are vertically arranged in the uplink piston air duct (201) and the downlink piston air duct (202) respectively, so that the uplink piston air duct (201) and the downlink piston air duct (202) are arranged in parallel. The centers of the two circular caissons of the third double-circle caisson structure are respectively aligned with the centers of the uplink line (401) and the downlink line (402).

7. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 6, characterized in that: The top of the third double-circle caisson structure is formed with a fourth piston air shaft (105) and a fifth piston air shaft (106) on the two sides respectively, the side of the downlink line (402) away from the uplink line (401) is formed with a fifth piston air hole (407), and the side of the uplink line (401) away from the downlink line (402) is formed with a sixth piston air hole (408), so that the uplink piston air duct (201) is vertically located on one side of the third double-circle caisson structure, the lower end of the uplink piston air duct (201) is connected to the uplink line (401) through the sixth piston air hole (408), the upper end of the uplink piston air duct (201) is connected to the ground through the fourth piston air shaft (105), the downlink piston air duct (202) is vertically located on the other side of the third double-circle caisson structure, the lower end of the downlink piston air duct (202) is connected to the downlink line (402) through the fifth piston air hole (407), and the upper end of the downlink piston air duct (202) is connected to the ground through the fifth piston air shaft (106).

8. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 7, characterized in that: The fourth piston air shaft (105) and the fifth piston air shaft (106) are respectively located directly above the uplink line (401) and the downlink line (402); or the fourth piston air shaft (105) and the fifth piston air shaft (106) are respectively constructed on the outer side above the uplink line (401) and the downlink line (402) through shallow open excavation.

9. The subway tunnel intermediate air shaft structure suitable for urban dense areas according to claim 1, characterized in that: The centers of the two cross beams (505) are respectively aligned with the centers of the first blade foot section and caisson body (501) and the second blade foot section and caisson body (502), the two cross beams (505) and the first blade foot section and caisson body (501) and the second blade foot section and caisson body (502) are symmetrically distributed about the internal support (507), and the two cross beams (505) and the internal support (507) divide the double-circle structure into eight excavation areas.

Images