Large shield well supporting structure based on steel ring frame beam

Abstract

The utility model discloses a large shield well supporting structure based on steel ring frame beams, which belongs to the technical field of underground station large shield construction and comprises a plurality of steel ring frame beams which are vertically arranged along a station shield well at intervals. The steel ring frame beam comprises a first steel beam section and a second steel beam section which are transversely arranged along the shield well, and a third steel beam section and a fourth steel beam section which are longitudinally arranged along the shield well; wherein the first steel beam section is connected with a station end wall, the two ends of the second steel beam section are connected with station side walls close to a station middle plate correspondingly, and the third steel beam section and the fourth steel beam section are connected with the station side walls on the two transverse sides correspondingly; a plurality of steel buttress columns are welded between the vertically adjacent third steel beam sections and between the vertically adjacent fourth steel beam sections at intervals, and meanwhile a plurality of steel buttress columns are arranged between the third steel beam section and the station bottom plate and between the fourth steel beam section and the station bottom plate at the lowest layer at intervals. The steel ring frame beam and the steel buttress are convenient to construct and dismantle, and the steel ring frame beam and the steel buttress can be repeatedly used.

Description

Technical Field

[0001] The utility model belongs to the technical field of large shield construction of underground stations, and particularly relates to a large shield shaft supporting structure based on a steel ring frame beam. Background Art

[0002] To control project costs and facilitate implementation during subway construction, large shield tunneling is increasingly being used in distribution areas rather than open-cut methods. To ensure the structural strength of the station, concrete ring frame beams are added to the side walls at the non-shield starting and receiving heights to support the side walls and ensure structural strength.

[0003] The size of the large shield machine usually used is relatively large (for example, the size of a commonly used large shield machine is 11.3m in outer diameter and 0.5m in wall thickness), while the platform height of the station is much smaller than the size of the shield machine. Figure 1 As shown, the starting range of the large shield machine is higher than the range of the middle plate of the second underground floor. If a conventional design is used to install a circle of concrete ring frame beams around the shield hole of the middle plate, it will block the starting or receiving of the shield machine. In addition, the second underground floor is a normal building space. If concrete ring frame beams are used, they will encroach on the building space, and later removal will consume manpower and material resources, which is not conducive to the progress of the project. Therefore, it is impossible to install concrete ring frame beams in the middle plate of the second underground floor to constrain the side walls. Under this condition, if the side walls are not reinforced, the calculated height of the side walls will be the second underground floor + the third underground floor. The calculated span is too large and cannot meet the load requirements.

[0004] To address these issues and ensure the station's main structure is supported, it's necessary to add ring frame beams to the side walls of the station hall, above the shield machine's initial receiving range, to provide support and ensure the stability of the shield shaft structure. For example, patent CN219175259U discloses a construction combining pit retaining beams with the main structure's ring frame beams. However, this construction requires a large number of pre-embedded steel connectors, requiring high construction precision. It also creates unnecessary construction joints, increasing the risk of water leakage. Furthermore, it doesn't address the issue of the ring frame beams encroaching on operational space after commissioning, requiring the removal of excess reinforced concrete from the protruding wall.

[0005] As a result, existing ring frame beams are large, waste space, and are difficult to remove after the holes are sealed. This process is not only labor-intensive and time-consuming, but also easily results in a waste of manpower, material, and financial resources. Therefore, developing a new construction technology for ring frame beams that is simple to construct, easy to dismantle, and reusable is a hot topic that the industry urgently needs to address. Utility Model Content

[0006] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the utility model provides a large shield shaft support structure based on steel ring frame beams, which is easy to construct and dismantle, and the steel ring frame beams and steel buttress columns are reusable.

[0007] To achieve the above object, the utility model provides a kind of big shield well support structure based on steel ring frame beam, including the steel ring frame beam being vertically spaced apart along station shield well several, the steel ring frame beam is located in the upside of station middle plate;

[0008] The steel ring frame beam includes first steel beam section and second steel beam section being arranged along the transverse direction of shield well, third steel beam section and fourth steel beam section being arranged along the longitudinal direction of shield well;Wherein the first steel beam section is connected with station end wall, the second steel beam section is connected with station side wall near station middle plate at both ends respectively, and third steel beam section and fourth steel beam section are connected with station side wall on both sides of transverse direction respectively;

[0009] Pre-buried bolt and / or pre-buried steel plate are arranged in the station end wall and station side wall, and the first steel beam section, third steel beam section and fourth steel beam section are connected with corresponding station end wall, station side wall by pre-buried bolt and / or pre-buried steel plate respectively;

[0010] A plurality of steel buttresses are arranged between vertically adjacent third steel beam sections and fourth steel beam sections by welding, and a plurality of steel buttresses are arranged between third steel beam section and fourth steel beam section in the lowermost layer and station bottom plate by welding.

[0011] As a further improvement of the utility model, the second steel beam section is connected with the concrete structure of the corner of the station side wall at both ends, and a pre-buried steel plate is arranged in the concrete structure;The second steel beam section is an I-beam structure, and both ends thereof are welded and connected with the pre-buried steel plate.

[0012] As a further improvement of the utility model, the first steel beam section, third steel beam section and fourth steel beam section are I-beam structures;

[0013] The flange plate of the first steel beam section, third steel beam section and fourth steel beam section is connected with station end wall and side wall by pre-buried bolt respectively;Or, the flange plate of the first steel beam section, third steel beam section and fourth steel beam section is connected with the pre-buried steel plate of station end wall and side wall by welding;Or, the flange plate of the first steel beam section, third steel beam section and fourth steel beam section is welded with the pre-buried steel plate, and is connected with station end wall and side wall by pre-buried bolt respectively.

[0014] As a further improvement of the utility model, at least one steel longitudinal beam is arranged between the first steel beam section and the second steel beam section, and both ends of the steel longitudinal beam are welded and connected with the first steel beam section and the second steel beam section respectively.

[0015] As a further improvement of the utility model, two steel longitudinal beams are arranged between the first steel beam section and the second steel beam section, so as to form two reinforcing frames around two shield holes.

[0016] As a further improvement of the utility model, the steel supporting wall column is a I-shaped steel structure, and the flange plates of the steel supporting wall column and the third steel beam segment and the fourth steel beam segment are connected through welding.

[0017] As a further improvement of the utility model, the end wall supporting wall column is a reinforced concrete column, and a pre-buried steel plate is arranged on the side surface of the end wall supporting wall column close to the first steel beam segment, and the first steel beam segment is connected with the pre-buried steel plate through welding.

[0018] As a further improvement of the utility model, the first steel beam segment and the second steel beam segment are parallel to each other, and the third steel beam segment and the fourth steel beam segment are parallel to each other.

[0019] As a further improvement of the utility model, the first steel beam segment is connected with the third steel beam segment and the fourth steel beam segment through welding at the joint.

[0020] Overall, compared with the prior art, the above technical scheme conceived by the utility model has the following beneficial effects:

[0021] (1) The large shield well support structure of the steel ring frame beam of the utility model is provided with multiple steel ring frame beams and steel supporting wall columns arranged vertically at the large shield well, and the steel ring frame beams are connected with the pre-buried bolts or steel plates in the end wall and the side wall of the main body structure during pouring, thereby forming a horizontal ring-shaped and vertical support system in the shield well, which can jointly bear the soil pressure outside the pit with the end wall and the side wall, has good safety and is easy to disassemble, and solves the problems of large size of the ring frame beam of the large shield side wall, waste of space, difficulty in disassembly after the hole is closed, and waste of manpower, material resources and financial resources.

[0022] (2) The large shield well support structure of the steel ring frame beam of the utility model is pre-fabricated in a factory and installed on site, has high steel strength and good implementability, is convenient to disassemble, has small disassembly workload, saves construction period, and can be recycled for the next project, thereby being reusable, low-carbon, economical and environmentally friendly. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The shield starting range of the embodiment of the utility model is shown in the figure;

[0024] Figure 2 The longitudinal section of the large shield well support structure based on the steel ring frame beam of the embodiment of the utility model is shown in the figure;

[0025] Figure 3 The transverse section of the large shield well support structure based on the steel ring frame beam of the embodiment of the utility model is shown in the figure;

[0026] Figure 4The utility model discloses a shield well support structure based on steel ring frame beam and end wall, side wall connection schematic diagram of embodiment of the utility model.

[0027] In all drawings, same reference signs represent same technical features, specifically: 1, shield tunnel;2, station middle plate;3, station side wall;4, steel ring frame beam;5, steel counterfort column;6, preburied bolt;7, preburied steel plate;8, station end wall;9, end wall counterfort column;10, steel longitudinal beam;11, welding joint;41, first steel beam section;42, second steel beam section;43, third steel beam section;44, fourth steel beam section. DETAILED DESCRIPTION

[0028] In order to make the utility model's purpose, technical scheme and advantage more clearly, following combining with the drawing and embodiment, the utility model is further detailedly explained. It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0030] In addition, the terms "first", "second" are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0031] In the utility model, unless another definite provision and limitation, the terms "mount", "connect", "connect", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication of two elements or the interaction of two elements, unless another definite limitation. For the ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or just indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or just indicate that the horizontal height of the first feature is less than that of the second feature.

[0033] As a preferred embodiment of the utility model, a large shield well support structure based on steel ring frame beam is provided, which is suitable for the case that the large shield construction is used in the wiring area, and the station middle plate shield hole cannot form a support system with cast-in-place ring frame beam due to the height of the large shield being higher than the station middle plate.

[0034] As shown in Figures 2 to 4 The utility model discloses a large shield well support structure based on steel ring frame beam, which comprises a plurality of steel ring frame beams 4 arranged vertically and spaced apart along the station shield well, and the steel ring frame beam 4 is arranged on the upper side of the station middle plate 2 and avoids the large shield starting and receiving range. The steel ring frame beam 4 is prefabricated in the factory, and is prefabricated into steel beam sections of different sizes according to the actual situation, and is assembled on site to adapt to the size requirements of different station shield wells.

[0035] In the embodiment, the steel ring frame beam 4 comprises a first steel beam section 41 and a second steel beam section 42 arranged transversely along the shield well, and a third steel beam section 43 and a fourth steel beam section 44 arranged longitudinally along the shield well, and the first steel beam section 41 and the second steel beam section 42 are parallel to each other, and the third steel beam section 43 and the fourth steel beam section 44 are parallel to each other. The first steel beam section 41 is connected to the station end wall 8 on the side opposite to the station middle plate 2, the second steel beam section 42 is connected to the station side wall 3 near the station middle plate 2 at both ends, and the third steel beam section 43 and the fourth steel beam section 44 are connected to the station side wall 3 on both sides of the transverse direction of the shield well. The first steel beam section 41, the second steel beam section 42, the third steel beam section 43 and the fourth steel beam section 44 on the same plane are connected to the station end wall or side wall to form a complete steel ring frame beam 4 in the ring direction.

[0036] Specifically, embedded bolts 6 and / or embedded steel plates 7 are arranged in the station end wall 8 and the station side wall 3, the first steel beam segment 41, the third steel beam segment 43 and the fourth steel beam segment 44 are preferably I-beam structures, the first steel beam segment 41 is connected with the station end wall 8 through corresponding embedded bolts 6 and / or embedded steel plates 7, and the third steel beam segment 43 and the fourth steel beam segment 44 are connected with the station side wall 3 through corresponding embedded bolts 6 and embedded steel plates 7.

[0037] Alternatively, embedded bolts 6 are arranged in the station end wall 8 and the station side wall 3, bolt holes corresponding in size and spacing to the embedded bolts 6 are respectively arranged on the flange plates of the first steel beam segment 41, the third steel beam segment 43 and the fourth steel beam segment 44, and the flange plates of the steel beam segments are connected with the end wall and the side wall through the embedded bolts 6 and nuts; or, embedded steel plates 7 are arranged in the station end wall 8 and the station side wall 3, and the flange plates of the steel beam segments are connected with the embedded steel plates 7 of the end wall and the side wall through welding; or, a welding + bolt connection mode is adopted, embedded bolts 6 and embedded steel plates 7 are arranged in the station end wall 8 and the station side wall 3 at the same time, and the flange plates of the steel beam segments are connected with the end wall and the side wall through the embedded bolts 6 and nuts while being welded with the embedded steel plates 7.

[0038] Further, in the embodiment, the second steel beam segment 42 is connected with the concrete structure at the corner of the station side wall 3 at both ends, preferably, embedded steel plates are arranged in the concrete structure, the second steel beam segment 42 is an I-beam structure, and the second steel beam segment 42 is connected with the concrete structure at the corner of the station side wall 3 at both ends through welding with the embedded steel plates.

[0039] Further, a plurality of steel buttresses 5 are arranged between vertically adjacent third steel beam segments 43 and between vertically adjacent fourth steel beam segments 44 through interval welding; meanwhile, a plurality of steel buttresses 5 are arranged between the third steel beam segment 43 and the fourth steel beam segment 44 located in the lowermost layer and the station floor through interval arrangement, and the bottom of the steel buttress 5 is supported on the station floor. Preferably, the steel buttress 5 is an I-beam structure, and the flange plates of the steel buttress 5 and the flange plates of the third steel beam segment 43 and the fourth steel beam segment 44 are connected through welding.

[0040] In the preferred embodiment, at least one steel stringer 10 is arranged between the first steel beam segment 41 and the second steel beam segment 42 to avoid the shield hole, and the two ends of the steel stringer 10 are welded with the first steel beam segment 41 and the second steel beam segment 42 respectively, for strengthening the stability of the overall structure. More preferably, two steel stringers 10 are arranged between the first steel beam segment 41 and the second steel beam segment 42, so as to form two reinforcing frames around the two shield holes.

[0041] In the preferred embodiment, the end wall 8 is provided with end wall buttress columns 9, which are reinforced concrete columns. The end wall buttress columns 9 are provided with embedded steel plates on one side surface close to the first steel beam section 41. The first steel beam section 41 and the embedded steel plates are connected by welding at the joint between the first steel beam section 41 and the end wall buttress columns 9.

[0042] In the preferred embodiment, the first steel beam section 41 is connected to the third steel beam section 43 and the fourth steel beam section 44 by welding at the joint, forming a welded joint 9.

[0043] The steel ring frame beam-based large shield well support structure of the above embodiment has the following specific construction steps:

[0044] 1) Perform station pit excavation and sequentially erect supports until the pit is excavated to the base.

[0045] 2) Pour the station floor, remove the supports below the station middle plate, pour the end wall and side wall, and embed steel plates and bolts on the end wall and side wall as needed.

[0046] 3) Erect the steel buttress columns 5 below the middle plate as needed, without affecting the station middle plate 2 for shield receiving and launching.

[0047] 4) Erect the steel ring frame beam 4, steel buttress columns 5, and steel stringers 10 above the middle plate as needed: the first steel beam section 41, third steel beam section 43, and fourth steel beam section 44 of the prefabricated steel ring frame beam 4 are connected to the station end wall and side wall using embedded steel plates and bolts; the second steel beam section 42 is connected to the station side wall by welding through the embedded steel plates in the concrete structure at the corner of the station side wall; the first steel beam section 41 is connected to the third steel beam section 43 and fourth steel beam section 44 by welding; the steel stringers 10 are welded between the first steel beam section 41 and the second steel beam section 42; and the steel buttress columns 5 are welded between vertically adjacent third steel beam sections 43 and fourth steel beam sections 44.

[0048] 5) Sequentially remove the supports above the station middle plate, continue pouring the end wall and side wall, erect the steel ring frame beam 4, steel buttress columns 5, and steel stringers 10 above the station middle plate as needed, and further pour the remaining end wall, side wall, and roof.

[0049] 6) After the shield hole is used, use micro-expanding concrete to close the shield hole. After the concrete reaches the required strength, the steel ring frame beam 4, steel buttress columns 5, and steel stringers 10 are removed and can be reused.

[0050] The steel ring frame beam based large shield well supporting structure of the embodiment of the utility model is characterized by simple installation and removal, reusability, and is vertically provided with multiple steel ring frame beams and steel supporting columns at the large shield well, is connected with the steel ring frame beams through the pre-buried bolts or steel plates during pouring of the end wall and side wall of the main body structure of the station, forms a horizontal ring and vertical supporting system in the shield well, jointly bears the soil pressure outside the pit with the end wall and side wall, can reduce the expansion of the shield, optimizes the size of the side wall, and is beneficial to saving the engineering investment. After the shield section construction is completed, the steel ring frame beams and steel supporting columns can be easily removed and recycled for the next project. The utility model solves the problems of large size of the ring frame beam of the side wall of the large shield, waste of space, difficulty in removal after the hole is closed, and waste of manpower, material resources and financial resources.

[0051] Those skilled in the art will readily understand that the above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A large shield caisson support structure based on a steel ring beam, characterized by, The steel ring frame beam is arranged on the upper side of the middle plate of the station, and comprises a first steel beam segment and a second steel beam segment arranged transversely along the shield well, and a third steel beam segment and a fourth steel beam segment arranged longitudinally along the shield well. The first steel beam segment is connected with the end wall of the station, the second steel beam segment is connected with the side wall of the station near the middle plate of the station at both ends, and the third steel beam segment and the fourth steel beam segment are connected with the side walls on both sides of the station. The first steel beam segment, the third steel beam segment and the fourth steel beam segment are respectively connected with the corresponding end wall and side wall of the station through the embedded bolts and / or the embedded steel plates. A plurality of steel buttresses are arranged between the third steel beam segments and the fourth steel beam segments in the vertical direction.

2. The steel ring beam based large shield shaft support structure according to claim 1, characterized in that, The second steel beam segment is connected with the concrete structure at the corner of the side wall of the station, and the embedded steel plate is arranged in the concrete structure.

3. The steel ring beam based large shield shaft support structure according to claim 1, characterized in that, The first steel beam segment, the third steel beam segment and the fourth steel beam segment are I-shaped steel structures. The flange plates of the first steel beam segment, the third steel beam segment and the fourth steel beam segment are respectively connected with the end wall and the side wall of the station through the embedded bolts, or the flange plates of the first steel beam segment, the third steel beam segment and the fourth steel beam segment are connected with the embedded steel plates of the end wall and the side wall of the station through welding, or the flange plates of the first steel beam segment, the third steel beam segment and the fourth steel beam segment are welded with the embedded steel plates and are respectively connected with the end wall and the side wall of the station through the embedded bolts.

4. The steel ring beam based large shield shaft support structure according to claim 1, wherein, At least one steel longitudinal beam is arranged between the first steel beam segment and the second steel beam segment, and the two ends of the steel longitudinal beam are respectively connected with the first steel beam segment and the second steel beam segment through welding.

5. The steel ring beam based large shield shaft support structure according to claim 4, characterized in that, Two steel longitudinal beams are arranged between the first steel beam segment and the second steel beam segment, so as to form two reinforcing frames around the two shield holes.

6. The steel ring beam based large shield shaft support structure according to any one of claims 1-5, characterized in that, The steel buttress is an I-shaped steel structure, and the flange plates of the steel buttress and the flange plates of the third steel beam segment and the fourth steel beam segment are connected through welding.

7. A steel ring beam based large shield shaft support structure according to any one of claims 1-5, characterized in that, An end wall buttress is arranged in the end wall of the station, the end wall buttress is a reinforced concrete column, the side surface of the end wall buttress near the first steel beam segment is provided with an embedded steel plate, and the first steel beam segment is welded with the embedded steel plate.

8. A steel ring beam based large shield shaft support structure according to any one of claims 1-5, characterized in that, The first steel beam segment and the second steel beam segment are parallel to each other, and the third steel beam segment and the fourth steel beam segment are parallel to each other.

9. The steel ring beam based large shield shaft support structure according to any one of claims 1-5, characterized in that, The joints of the first steel beam segment and the third steel beam segment and the fourth steel beam segment are welded.

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