CN215406163U - Assembled multilayer flat-top large-span pillar-free underground structure - Google Patents

Assembled multilayer flat-top large-span pillar-free underground structure Download PDF

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Publication number
CN215406163U
CN215406163U CN202120579130.0U CN202120579130U CN215406163U CN 215406163 U CN215406163 U CN 215406163U CN 202120579130 U CN202120579130 U CN 202120579130U CN 215406163 U CN215406163 U CN 215406163U
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side wall
section
prefabricated member
flat
prefabricated
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Inventor
徐军林
潘�清
刘毅
莫振泽
汪国良
徐彦泽
邢琼
胡正波
许俊超
王华兵
蒋晔
周兵
王俯标
李新军
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Wuxi Metro Group Co ltd
China Railway Siyuan Survey and Design Group Co Ltd
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Wuxi Metro Group Co ltd
China Railway Siyuan Survey and Design Group Co Ltd
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Priority to CN202120579130.0U priority Critical patent/CN215406163U/en
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Abstract

The utility model provides an assembled multilayer flat-top large-span pillarless underground structure which comprises a building envelope, a bottom plate, a first side wall prefabricated part and a middle plate prefabricated part, wherein the building envelope is a hollow structure; first side wall prefab sets up in the bottom plate both sides, and first side wall prefab is triangle bearing diagonal structure, including vertical section, horizontal segment and bearing diagonal section, the top and the horizontal segment one end of vertical section are connected, and the other end and the bearing diagonal section one end of horizontal segment are connected, and the other end and the vertical section of bearing diagonal section are connected, and the tip of horizontal segment and bearing diagonal section is equipped with the step, and the both ends of medium plate prefab are connected with the step of the first side wall prefab of both sides respectively. This assembled multilayer flat top stride no post underground construction's lower floor greatly adopts no post structural style, utilizes triangle bearing diagonal structure to support the center plate prefab, under the whole atress's of assurance substructure condition, has better realized building vision no post big space effect, and the foundation ditch buried depth increases less, and does not have the hunch foot and expands thrust outward, has improved the stability of structure.

Description

Assembled multilayer flat-top large-span pillar-free underground structure
Technical Field
The utility model belongs to the technical field of underground engineering construction, and particularly relates to an assembled multilayer flat-top large-span pillarless underground structure.
Background
The existing open cut method for constructing an underground structure with an inner support foundation pit adopts the traditional construction technology of a cast-in-place reinforced concrete structure, the design process is complex, and the workload is large; in the field construction process, a large amount of labor force of multiple types is needed, the construction operation environment is poor, the construction process is complex, the construction speed is low, the influence of various weather and climate is great, and the construction quality is difficult to ensure. Meanwhile, a lot of waste construction waste is generated in the construction process, so that resources are wasted and the environment is polluted. The cast-in-place concrete structure construction management and control is uneven, various quality defects often appear in the appearance or the interior of the concrete structure due to various reasons after construction is completed, the later-stage repair difficulty is high, and the quality is difficult to guarantee.
With the progress of science and technology, the development of equipment manufacturing industry and the upgrading and transformation of industry, more and more work is carried out by replacing manpower with machines, and high technology replaces labor-intensive type and automatic control equipment replaces manual control. Various components (beams, plates, columns, walls) required in the field of building engineering will be gradually produced in batches in factories and then transported to the site for assembly.
With the development of the assembly type technology, partial assembly type design and construction technical schemes are developed in the underground structure, and some underground structures are only suitable for open excavation foundation pits with less underground water and adopting slope release or anchor cables (rods) and are not suitable for areas with inner supports and abundant underground water in the foundation pits; some parts only adopt the assembled structure, and the assembly degree is not high, and the assembly efficiency is low. The existing scheme aims at the conventional underground structure with columns, and the view of the underground space is not wide; the existing scheme of the pillarless underground structure is mostly a vault, the external thrust is large, the increase of the buried depth of the foundation pit is large, the manufacturing cost is high, the soil body outside the foundation pit is strictly forbidden to be unloaded, and the requirement on the management and control of the surrounding environment after operation is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an assembled multi-layer flat-top large-span pillarless underground structure, which can effectively solve the problems of water resistance and structural integrity of the underground assembled structure, better realize the visual pillarless large-space effect of a building, increase of the buried depth of a foundation pit is less, and no arch foot outward expansion thrust is generated, thereby improving the stability of the structure.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an assembled multilayer flat-top large-span pillarless underground structure comprises a building envelope, and a bottom plate, a first side wall prefabricated member and a middle plate prefabricated member which are arranged in the building envelope; the first side wall prefabricated part sets up in the bottom plate both sides, first side wall prefabricated part is triangle bearing diagonal structure, including vertical section, horizontal segment and bearing diagonal section, the top of vertical section is connected with the one end of horizontal segment, the other end of horizontal segment with the one end of bearing diagonal section is connected, the other end of bearing diagonal section with vertical section is connected, the horizontal segment is equipped with the step with the tip of bearing diagonal section, the both ends of medium plate prefabricated part are connected with the step of the first side wall prefabricated part of both sides respectively.
Furthermore, cast-in-place layers of the first side wall are poured between the first side wall prefabricated member and the building envelope and between the first side wall prefabricated member and the bottom plate.
Furthermore, the bottom of the two ends of the middle plate prefabricated part is provided with a L-shaped groove I matched with the step profile of the first side wall prefabricated part, the step end of the first side wall prefabricated part is abutted in the L-shaped groove I, and the upper surface of the middle plate prefabricated part is flush with the upper surface of the horizontal section of the first side wall prefabricated part.
Furthermore, the bottom of the middle plate prefabricated part is provided with an inclined section extending from the bottom end of the L-shaped notch I to the middle part of the middle plate prefabricated part, and the slope of the inclined section is consistent with that of the inclined supporting section of the first side wall prefabricated part; or the L-shaped groove mouths at the two ends of the middle plate prefabricated part are connected through an arc-shaped section.
Furthermore, be equipped with flat top plate prefab directly over the medium plate prefab, the both sides of flat top plate prefab are equipped with second side wall prefab, the both ends of flat top plate prefab set up respectively on second side wall prefab, the bottom of second side wall prefab is passed through locating component and is connected with the vertical section top of first side wall prefab.
Further, second side wall prefab is triangle bearing diagonal structure, including vertical section, horizontal segment and bearing diagonal section, the top of vertical section is connected with the one end of horizontal segment, the other end of horizontal segment with the one end of bearing diagonal section is connected, the other end of bearing diagonal section with vertical section is connected, the horizontal segment is equipped with the step with the tip of bearing diagonal section, the both ends of flat top plate prefab are connected with the step of the second side wall prefab of both sides respectively.
Furthermore, the vertical section, the horizontal section and the inclined support section of the triangular inclined support structure are integrally prefabricated and molded; or the vertical section, the horizontal section and the diagonal bracing section of the triangular diagonal bracing structure are prefabricated in a split mode, and the side wall prefabricated part is formed through assembling.
Further, second side wall cast-in-place layers are poured between the second side wall prefabricated member and the building envelope and between the second side wall prefabricated member and the first side wall prefabricated member; and a cast-in-situ layer of the flat top slab is poured on the upper surface formed by connecting the second side wall prefabricated member and the flat top slab prefabricated member.
Furthermore, the bottoms of the two ends of the top flat plate prefabricated part are provided with a L-shaped groove II matched with the step profile of the second side wall prefabricated part, the step end part of the second side wall prefabricated part is abutted in the L-shaped groove II, and the upper surface of the top flat plate prefabricated part is flush with the upper surface of the horizontal section of the second side wall prefabricated part.
Further, the L-shaped grooves at two ends of the flat top plate prefabricated part are connected through an arc-shaped section; or the bottom of the flat top plate prefabricated member is provided with an inclined section extending from the bottom end of the L-shaped notch II to the middle of the flat top plate prefabricated member, and the slope of the inclined section is consistent with that of the inclined supporting section of the second side wall prefabricated member.
Compared with the prior art, the utility model has the beneficial effects that:
(1) according to the assembled multi-layer flat-top large-span pillarless underground structure provided by the utility model, the upper layer and the lower layer are respectively supported by the middle plate prefabricated member and the flat top plate prefabricated member by adopting the triangular inclined supporting structures, so that the multi-layer flat-top large-span pillarless underground structure realizes the visual pillarless large space effect of a building, the foundation pit buried depth is slightly increased, the arch foot outward expansion thrust is avoided, and the stability of the structure is improved.
(2) The fabricated integral laminated structure with the cast-in-place laminated layer added outside the prefabricated part is adopted, so that temporary facilities such as on-site formwork erecting, scaffold erecting and the like can be partially omitted, the construction period is saved, and the waterproof performance and the integral stress performance of the fabricated underground structure can be effectively improved.
(3) The assembled multilayer flat-top large-span pillarless underground structure provided by the utility model adopts a reasonable component partitioning scheme, so that the size and the weight of the side wall prefabricated part can be reduced, the size and the weight of the prefabricated part can meet the requirements of field hoisting and assembling of a supporting foundation pit, the transportation of the prefabricated part is facilitated, and the industrialized popularization and application can be better realized.
(4) The assembled multi-layer flat-top large-span pillarless underground structure provided by the utility model has the advantages of standardized prefabricated part size, reduced design workload, improved production efficiency, improved building quality, capability of better realizing industrialization, labor saving, template and scaffold saving, shortened construction period, energy conservation, environmental protection and the like; and the prefabricated component can realize from steady, need not increase extra interim auxiliary stay measure, and construction installation is convenient high-efficient.
(5) The connection part of the side wall prefabricated member and the laminated plate prefabricated member in the assembled multilayer flat-top large-span pillarless underground structure provided by the utility model adopts cast-in-place 'wet nodes', and the assembled underground structure has good waterproofness and integrity.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of an assembled multi-layer flat-top large-span pillar-free underground structure in an embodiment of the utility model;
FIG. 2 is a schematic view of a triangular diagonal support structure in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a middle plate preform in an embodiment of the present invention;
FIG. 4 is a schematic structural view of a flat-top plate preform according to an embodiment of the present invention;
fig. 5 is a schematic view of a connection node between a first side wall prefabricated member and a second side wall prefabricated member in the embodiment of the utility model.
Description of reference numerals: 1. an enclosure structure; 2. a concrete cushion; 3. an inner support; 4. a crown beam; 5. a floor layer; 6. a positioning member; 7. a first side wall preform; 8. a middle plate prefabricated part; 9. a first side wall cast-in-place layer; 10. a second side wall preform; 11. a flat top deck preform; 12. a second side wall cast-in-place layer; 13. a cast-in-place layer of the flat top slab; 14. a vertical section; 15. an inclined support section; 16. a step; 17. a horizontal segment; 18. a first slot opening; 19. an inclined section; 20. a second slot opening; 21. an arc-shaped section; 22. positioning a steel member; 23. positioning the section steel; 24. u-shaped steel bars.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1 and 2, the present embodiment provides an assembled multi-storey flat-top large-span pillarless underground structure, which comprises a building envelope 1, and a bottom plate 5, a first side wall prefabricated member 7 and a middle plate prefabricated member 8 arranged in the building envelope 1; the first side wall prefabricated part 7 is arranged on two sides of the bottom plate 5, the first side wall prefabricated part 7 is of a triangular inclined supporting structure and comprises a vertical section 14, a horizontal section 17 and an inclined supporting section 15, the top of the vertical section 14 is connected with one end of the horizontal section 17, the other end of the horizontal section 17 is connected with one end of the inclined supporting section 15, and the other end of the inclined supporting section 15 is connected with the vertical section 14, so that self-stability can be realized in the installation process of the formed first side wall prefabricated part 7, no additional temporary auxiliary supporting measure is needed, and the construction and installation are convenient and efficient; meanwhile, in order to realize the supporting effect of the centering plate prefabricated member 8, a step 16 is arranged at the connecting end part of the horizontal section 17 and the inclined supporting section 15, two ends of the middle plate prefabricated member 8 are respectively connected with the steps 16 of the first side wall prefabricated members 7 at two sides, the end part of the centering plate prefabricated member 8 is supported by utilizing the step 16 structure, and meanwhile, the middle plate prefabricated member 8 is convenient to assemble with the centering plate prefabricated member 8. In this embodiment, this assembled multilayer flat top stride no post underground structure's lower floor greatly adopts no post structural style, utilizes triangle bearing diagonal structure to support to well slab prefab 8, under the whole atress's of assurance substructure condition, has better realized building vision no post big space effect, and the foundation ditch buried depth increases less, and does not have the hunch foot and expands thrust outward, has improved the stability of structure.
Wherein, bottom plate 5 can adopt the reinforced concrete structure form that the cast-in-place concrete that builds formed behind the framework of steel reinforcement ligature, also can adopt the multistage prefab to assemble the connection, reduces the size and the weight of single prefab, and the transportation of the prefab of being convenient for, hoist and mount and assemble, and connect through concreting between the adjacent prefab, improve the wholeness of structure.
The connection among the vertical section 14, the horizontal section 17 and the inclined support section 15 of the triangular inclined support structure can be integrally prefabricated and formed, or the vertical section 14, the horizontal section 17 and the inclined support section 15 can be prefabricated in a split mode and then assembled to form the triangular inclined support structure.
Furthermore, a cast-in-place layer 9 of the first side wall is poured between the prefabricated part 7 of the first side wall and the building enclosure 1 and between the prefabricated part 7 of the first side wall and the bottom plate 5, and by adopting the assembly type integral laminated structure with the cast-in-place laminated layer added on the outer side of the prefabricated part, temporary facilities such as on-site formwork erecting and scaffold erecting can be partially omitted, the construction period is shortened, and the waterproof performance and the integral stress performance of the assembly type underground structure can be effectively improved.
As an embodiment, as shown in fig. 3, the bottom of the two ends of the middle plate preform 8 has a l-shaped slot 18 matching the profile of the step 16 of the first side wall preform 7, the end of the step 16 of the first side wall preform 7 abuts against the l-shaped slot 18, the middle plate preform 8 at the upper part of the l-shaped slot 18 is partially overlapped on the step 16 of the first side wall preform 7, the step 16 supports the middle plate preform 8, and the structural design of the l-shaped slot 18 can form a pressing force on the middle plate preform 8 by the end of the step 16 when the first side wall preform 7 and the middle plate preform 8 at the two sides are assembled, thereby preventing the assembling process from being unstable and further improving the stability of the assembling structure of the first side wall preform 7 and the middle plate preform 8. Further, in order to realize the integrality of the connection structure of the first side wall prefabricated member 7 and the middle plate prefabricated member 8, the end embedded positioning member of the lap joint part of the middle plate prefabricated member 8 is fixed with the first side wall prefabricated member 7, the upper surface of the middle plate prefabricated member 8 is ensured to be flush with the upper surface of the horizontal section of the first side wall prefabricated member 7, a wet node is cast in situ between the first side wall prefabricated member 7 and the middle plate prefabricated member 8, and the first side wall prefabricated member 7 and the middle plate prefabricated member 8 are connected into a whole.
Preferably, the bottom of the middle plate prefabricated member 8 is provided with an inclined section 19 extending from the bottom end of the L-shaped notch-18 to the middle of the middle plate prefabricated member 8, and the slope of the inclined section 19 is made to be consistent with the slope of the inclined support section 15 of the first side wall prefabricated member 7, by adopting the structural design, when the first side wall prefabricated member 7 is assembled with the middle plate prefabricated member 8, the inclined support section 15 of the first side wall prefabricated member 7 can apply an inclined upward supporting force to the middle plate prefabricated member 8, and not only depends on the vertical upward supporting effect of the upper surface of the step 16 of the first side wall prefabricated member 7 on the middle plate prefabricated member 8, so that the stability of the whole structure is further improved.
Further, the bottom of the middle plate prefabricated member 8 can also adopt an arc section 21 to connect the L-shaped notch-L18 at two ends, at this time, one side below the axis of the inclined support section 15 of the first side wall prefabricated member 7 is designed into an arc structure, and the arc structure of the inclined support section 15 of the first side wall prefabricated member 7 and the arc section 21 at the bottom of the middle plate prefabricated member 8 are concentric, so that when the first side wall prefabricated member 7 and the middle plate prefabricated member 8 are assembled, the inclined support section 15 of the first side wall prefabricated member 7 and the middle plate prefabricated member 8 form a whole arc vault structure, the stability of the assembled structure is guaranteed, and the visual effect of the decoration building is improved.
As an implementation mode of the arrangement form of the components in the upper-layer space of the fabricated multi-layer flat-top large-span pillarless underground structure, as shown in fig. 1, a flat top slab prefabricated member 11 is arranged right above the middle slab prefabricated member 8, second side wall prefabricated members 10 are arranged on two sides of the flat top slab prefabricated member 11, two ends of the flat top slab prefabricated member 11 are respectively arranged on the second side wall prefabricated members 10, and the bottom of the second side wall prefabricated member 10 is connected with the top of the vertical section 14 of the first side wall prefabricated member 7 through a positioning component 6.
The second side wall prefabricated member 10 may also adopt a triangular inclined support structure the same as that of the first side wall prefabricated member 7, as shown in fig. 2, the second side wall prefabricated member includes a vertical section 14, a horizontal section 17 and an inclined support section 15, the top of the vertical section 14 is connected with one end of the horizontal section 17, the other end of the horizontal section 17 is connected with one end of the inclined support section 15, the other end of the inclined support section 15 is connected with the vertical section 14, a step 16 is arranged at the connecting end part of the horizontal section 17 and the inclined support section 15, two ends of the flat top slab prefabricated member 11 are respectively connected with the steps 16 of the second side wall prefabricated member 10 at two sides, the end part of the flat top slab prefabricated member 11 is supported by using the step 16 structure, and meanwhile, the assembly with the flat top slab prefabricated member 11 is facilitated. The triangular diagonal bracing structure of the second side wall prefabricated member 10 can be prefabricated and formed integrally by the vertical section 14, the horizontal section 17 and the diagonal bracing section 15 as same as the first side wall prefabricated member, or the vertical section 14, the horizontal section 17 and the diagonal bracing section 15 are prefabricated separately and then assembled to form the second side wall prefabricated member.
Further, a second side wall cast-in-place layer 12 is poured between the second side wall prefabricated member 10 and the building envelope 1 and between the second side wall prefabricated member 10 and the first side wall prefabricated member 7; the upper surface that second side wall prefab 10 and flat top slab prefab 11 are connected and are formed pours flat top slab cast-in-place layer 13, through adopting the whole coincide structure of the assembled that adopts this kind of prefab outside to increase cast-in-place coincide layer, can partly remove on-the-spot formwork, erect interim facilities such as scaffold frame, save the time limit for a project to can improve the waterproof performance and the whole atress performance of assembled underground structure effectively.
For the installation of the flat top plate preform 11, as an embodiment, as shown in fig. 4, the bottom of both ends of the flat top plate preform 11 has a reverse-shaped notch 20 matching with the contour of the step 16 of the second side wall preform 10, the end of the step 16 of the second side wall prefabricated member 10 is abutted against the L-shaped notch II 20, and the flat top plate prefabricated member 11 on the upper part of the L-shaped notch II 20 is partially overlapped on the step 16 of the second side wall prefabricated member 10 at the same time, and the flat top plate prefabricated member 11 is supported by the step 16, meanwhile, the structure design of the L-shaped notch two 20 can make the second side wall prefabricated member 10 and the flat top slab prefabricated member 11 on both sides assembled, the end parts of the steps 16 form extrusion force on the flat top plate prefabricated member 11, instability in the assembling process is prevented, and the stability of the assembling structure of the second side wall prefabricated member 10 and the flat top plate prefabricated member 11 is further improved. Further, in order to realize the integrity of the connection structure of the second side wall prefabricated member 10 and the flat top slab prefabricated member 11, the end embedded positioning member of the lap joint part of the flat top slab prefabricated member 11 is fixed with the second side wall prefabricated member 10, meanwhile, the upper surface of the flat top slab prefabricated member 11 is ensured to be flush with the upper surface of the horizontal section of the second side wall prefabricated member 10, then, a wet joint is cast in situ between the second side wall prefabricated member 10 and the flat top slab prefabricated member 11, and the second side wall prefabricated member 10 and the flat top slab prefabricated member 11 are connected into a whole.
Optimally, the second L-shaped notches 20 at the two ends of the flat top slab prefabricated member 11 are connected through an arc-shaped section 21, one side below the axis of the inclined support section 15 of the second side wall prefabricated member 10 can be designed into an arc-shaped structure, the arc-shaped structure of the inclined support section 15 of the second side wall prefabricated member 10 is concentric with the arc-shaped section 21 at the bottom of the flat top slab prefabricated member 11, when the second side wall prefabricated member 10 is assembled with the flat top slab prefabricated member 11, the inclined support section 15 of the second side wall prefabricated member 10 and the flat top slab prefabricated member 11 form an integral arc vault structure, the stability of the assembled structure is guaranteed, and the visual effect of the decoration building is improved.
Furthermore, the bottom of the top flat plate prefabricated member 11 may further be designed to have an inclined section 19 extending from the bottom end of the second l-shaped notch 20 to the middle of the top flat plate prefabricated member 11, and the slope of the inclined section 19 is made to be consistent with the slope of the inclined support section 15 of the second side wall prefabricated member 10, by adopting the structural design, when the second side wall prefabricated member 10 is assembled with the top flat plate prefabricated member 11, the inclined support section 15 of the second side wall prefabricated member 10 may apply an inclined upward supporting force to the top flat plate prefabricated member 11, instead of relying on the supporting action of the upper surface of the step 16 of the second side wall prefabricated member 10 on the top flat plate prefabricated member 11 in the vertical upward direction, thereby further improving the stability of the overall structure.
The structural forms of the bottom of the middle plate prefabricated member 8 and the bottom of the top plate prefabricated member 11 can be combined interchangeably, such as: the bottoms of the middle plate prefabricated part 8 and the top plate prefabricated part 11 are designed into arc sections 21; or both designed as inclined sections 19; or the bottom of the middle plate prefabricated part 8 is designed into an inclined section 19, and the bottom of the flat top plate prefabricated part 11 is designed into an arc-shaped section 21; or the bottom of the middle plate prefabricated member 8 is designed into an arc-shaped section 21, and the bottom of the flat top plate prefabricated member 11 is designed into an inclined section 19.
In this embodiment, when the second side wall prefabricated member 10 is installed, the bottom of the vertical section 14 of the second side wall prefabricated member is directly connected with the top of the vertical section 14 of the first side wall prefabricated member 7 on the same side through the positioning member 6, as an embodiment, as shown in fig. 5, the positioning member 6 comprises a positioning steel member 22 which is pre-buried in the top of the vertical section 14 of the first side wall prefabricated member 7 and is horizontally arranged, and a positioning steel member 23 which is pre-buried in the bottom of the vertical section 14 of the second side wall prefabricated member 10 and is wholly or partially exposed, when the second side wall prefabricated member 10 is hoisted to the upper side of the first side wall prefabricated member 7, the positioning steel member 23 and the positioning steel member 22 are used for welding and fixing the relative positions of the second side wall prefabricated member 10 and the first side wall prefabricated member 7, so as to improve the positioning efficiency and the positioning accuracy. Such positioning members 6 may also be used for the connection between the middle plate preform 8 and the first side wall preform 7, and between the flat top plate preform 11 and the second side wall preform 10.
Further, when second side wall prefab 10 is connected with first side wall prefab 7, this locating component still can include that two U shaped steel muscle 24 are detained mutually and are connected, when pouring cast-in-place layer 12 of second side wall, pour into overall structure with first side wall prefab 7 and second side wall prefab 10 through cast-in-place mode, it is accurate not only to have guaranteed that first side wall prefab 7 and second side wall prefab 10 are counterpointed, and first side wall cast-in-place layer 9 has still been connected to two U shaped steel muscle 24, second side wall cast-in-place layer 12, the stress intensity of the connected node on side wall prefab and side wall cast-in-place layer has been strengthened, the problem that current assembled structure spare seam crossing is easy to leak has been solved.
The open cut construction process of the assembled multi-layer flat-top large-span pillarless underground structure is as follows:
(1) after the two building enclosures 1 are constructed, constructing a crown beam 4, constructing by adopting an open cut method, erecting three inner supports 3 between the two building enclosures 1 while excavating, and excavating to the bottom of a foundation pit.
(2) The construction method comprises the following steps of constructing a concrete cushion layer 2 at the bottom of a foundation pit, constructing a waterproof layer on the concrete cushion layer 2, completing the construction of a bottom plate 5, and removing a bottommost inner support 3.
(3) Constructing a waterproof layer on the building envelope 1 corresponding to the installation position of the first side wall prefabricated part 7, hoisting and constructing a first side wall prefabricated part 7 at two sides of the bottom plate 5 close to the enclosure structure 1, fixing the bottom of the first side wall prefabricated part 7 with the bottom plate 5 by using the embedded positioning members 6, fixing the top of the first side wall prefabricated part with the enclosure structure 1, a middle plate prefabricated part 8 is constructed between the two first side wall prefabricated parts 7, so that two ends of the middle plate prefabricated part 8 are respectively fixed with the two first side wall prefabricated parts 7, wherein, first side wall prefab 7 adopts triangle bearing diagonal structure, utilizes triangle bearing diagonal structure to support well plate prefab 8, and the atress transmits to bottom plate 5 through triangle bearing diagonal structure on the well plate prefab 8, need not to set up the center pillar in the centre and supports, has better realized building vision column-free big space effect, has guaranteed the stability of structure moreover.
(4) Utilize first side wall prefab 7, envelope 1 is as the side form board, concreting between first side wall prefab 7 and envelope 1 and between first side wall prefab 7 and bottom plate 5, form first side wall cast-in-place layer 9, accomplish wet node simultaneously and pour between medium plate prefab 8 and first side wall prefab 7, link first side wall prefab 7 and medium plate prefab 8 into an organic whole, then support 3 in dismantling the middle one, first side wall cast-in-place layer 9 forms the congruent structure with first side wall prefab 7, the waterproof performance and the wholeness of assembled underground structure are improved.
(5) Constructing a second side wall prefabricated part 10 and a flat top plate prefabricated part 11 above the first side wall prefabricated part 7 according to the process in the step (3), specifically, constructing a waterproof layer at a position, corresponding to the installation position of the second side wall prefabricated part 10, on the enclosure structure 1, hoisting the second side wall prefabricated part 10, fixing the bottom of the second side wall prefabricated part 10 to the top of the first side wall prefabricated part 7 by utilizing a pre-embedded positioning component 6, fixing the top of the second side wall prefabricated part to the enclosure structure 1, constructing the flat top plate prefabricated part 11 between the two second side wall prefabricated parts 10, and fixing two ends of the flat top plate prefabricated part 11 to the two second side wall prefabricated parts 10 respectively; similarly, the second side wall prefabricated member 10 also adopts a triangular inclined supporting structure, and the flat top slab prefabricated member 11 is supported by the triangular inclined supporting structure.
(6) And pouring concrete between the second side wall prefabricated member 10 and the building envelope 1 and between the second side wall prefabricated member 10 and the first side wall prefabricated member 7 to form a second side wall cast-in-place layer 12, pouring a flat top slab cast-in-place layer 13 on the upper surface formed by connecting the second side wall prefabricated member 10 and the flat top slab prefabricated member 11, and connecting the second side wall prefabricated member 10 and the flat top slab prefabricated member 11 into a whole.
(7) And (3) removing the uppermost inner support 3 to finish the work of pipeline backfilling, soil covering backfilling and the like.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the utility model, which is intended to be covered by the claims and any design similar or equivalent to the scope of the utility model.

Claims (10)

1. An assembled multilayer flat-top large-span pillarless underground structure is characterized by comprising an enclosure structure, and a bottom plate, a first side wall prefabricated member and a middle plate prefabricated member which are arranged in the enclosure structure; the first side wall prefabricated part sets up in the bottom plate both sides, first side wall prefabricated part is triangle bearing diagonal structure, including vertical section, horizontal segment and bearing diagonal section, the top of vertical section is connected with the one end of horizontal segment, the other end of horizontal segment with the one end of bearing diagonal section is connected, the other end of bearing diagonal section with vertical section is connected, the horizontal segment is equipped with the step with the tip of bearing diagonal section, the both ends of medium plate prefabricated part are connected with the step of the first side wall prefabricated part of both sides respectively.
2. The fabricated multi-storey flat-top large-span pillarless underground structure of claim 1, wherein a cast-in-place layer of the first side wall is cast between the prefabricated member of the first side wall and the building envelope, and between the prefabricated member of the first side wall and the bottom plate.
3. The fabricated multi-layer flat-top large-span pillarless underground structure of claim 1, wherein the bottom of each end of the middle plate preform has a L-shaped notch matched with the step profile of the first side wall preform, the step end of the first side wall preform abuts against the L-shaped notch, and the upper surface of the middle plate preform is flush with the upper surface of the horizontal section of the first side wall preform.
4. The fabricated multi-layered flat-top large-span pillarless underground structure of claim 3, wherein the bottom of the middle plate preform is provided with an inclined section extending from the bottom end of the first L-shaped slot toward the middle of the middle plate preform, and the slope of the inclined section is identical to the slope of the inclined support section of the first side wall preform; or the L-shaped groove mouths at the two ends of the middle plate prefabricated part are connected through an arc-shaped section.
5. The fabricated multi-layer flat-top large-span pillarless underground structure of claim 1, wherein a flat-top slab prefabricated member is arranged right above the middle slab prefabricated member, second side wall prefabricated members are arranged on two sides of the flat-top slab prefabricated member, two ends of the flat-top slab prefabricated member are respectively arranged on the second side wall prefabricated members, and the bottom of each second side wall prefabricated member is connected with the top of the vertical section of the corresponding first side wall prefabricated member through a positioning member.
6. The fabricated multi-layer flat-top large-span pillarless underground structure of claim 5, wherein the second side wall prefabricated member is a triangular inclined supporting structure comprising a vertical section, a horizontal section and an inclined supporting section, the top of the vertical section is connected with one end of the horizontal section, the other end of the horizontal section is connected with one end of the inclined supporting section, the other end of the inclined supporting section is connected with the vertical section, the connecting end part of the horizontal section and the inclined supporting section is provided with a step, and two ends of the flat top plate prefabricated member are respectively connected with the steps of the second side wall prefabricated members on two sides.
7. The fabricated multi-layer flat-top large-span pillarless underground structure as claimed in claim 1 or 6, wherein the vertical section, the horizontal section and the inclined support section of the triangular inclined support structure are integrally prefabricated and molded; or the vertical section, the horizontal section and the diagonal bracing section of the triangular diagonal bracing structure are prefabricated in a split mode, and the side wall prefabricated part is formed through assembling.
8. The fabricated multilayer flat-top large-span pillarless underground structure of claim 5, wherein a second side wall cast-in-place layer is poured between the second side wall prefabricated member and the building envelope and between the second side wall prefabricated member and the first side wall prefabricated member; and a cast-in-situ layer of the flat top slab is poured on the upper surface formed by connecting the second side wall prefabricated member and the flat top slab prefabricated member.
9. The fabricated multi-layer flat-top large-span pillarless underground structure of claim 5, wherein the bottom of the two ends of the top plate preform has a L-shaped notch II matching with the step profile of the second side wall preform, the step end of the second side wall preform abuts against the L-shaped notch II, and the top surface of the top plate preform is flush with the top surface of the horizontal section of the second side wall preform.
10. The fabricated multi-layered flat-top large-span pillarless underground structure of claim 9, wherein the second l-shaped notches at both ends of the top-plate preform are connected by an arc-shaped segment; or the bottom of the flat top plate prefabricated member is provided with an inclined section extending from the bottom end of the L-shaped notch II to the middle of the flat top plate prefabricated member, and the slope of the inclined section is consistent with that of the inclined supporting section of the second side wall prefabricated member.
CN202120579130.0U 2021-03-22 2021-03-22 Assembled multilayer flat-top large-span pillar-free underground structure Active CN215406163U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114908800A (en) * 2022-05-11 2022-08-16 广州地铁设计研究院股份有限公司 Full-prefabricated non-column arch-shaped assembled subway station structure with variable width and floor height
CN115288194A (en) * 2022-09-15 2022-11-04 中铁第四勘察设计院集团有限公司 Underground structure entrance and exit channel assembly type superimposed structure and process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114908800A (en) * 2022-05-11 2022-08-16 广州地铁设计研究院股份有限公司 Full-prefabricated non-column arch-shaped assembled subway station structure with variable width and floor height
CN115288194A (en) * 2022-09-15 2022-11-04 中铁第四勘察设计院集团有限公司 Underground structure entrance and exit channel assembly type superimposed structure and process

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