Mechanized layered assembly construction structure and construction method of prefabricated underground structure

Abstract

The mechanized layered assembly construction structure and construction method of prefabricated underground structures belong to the field of underground engineering technology. The appearance geometric shape of the bottom foundation layer is rectangular and "convex"; the backfill layer is the area between the prefabricated components and the foundation pit support structure and the bottom foundation layer; the prefabricated components are prefabricated solid blocks with top openings, bottom openings, and top and bottom double openings; the wall end structure of the side wall is a plane, convex, or concave structure, and the prefabricated components are spatial structures assembled layer by layer from bottom to top; the cross-sectional form of the spatial structure is rectangular, arched, or other structural forms, and the size, position, and wall end structure of the side walls of the prefabricated components on the same layer are the same. After the prefabricated components are longitudinally connected, the side wall ends form a flat and straight surface. When assembling the upper components, the present invention arranges the assembly device on the side wall of the lower component, effectively reducing the equipment cost, and provides a working surface for subsequent processes, thereby improving construction efficiency.

Description

Technical Field

[0001] The present invention relates to a mechanized layered assembly construction structure and a construction method for an assembled underground structure, belonging to the technical field of underground engineering. Background Art

[0002] Urban underground projects generally utilize traditional cast-in-place construction techniques, resulting in a relatively crude production method that falls far short of the requirements for high-quality development. With my country's economic growth and rapid social development, the demand for transformation and upgrading in the construction industry has become urgent. The development of prefabricated buildings represents a significant shift in construction methods and a crucial measure for advancing supply-side structural reform and the development of new urbanization. It contributes to conserving resources and energy, reducing construction pollution, improving labor productivity and quality and safety, and promoting the construction industry's transition toward industrialization and informatization, fostering new industries and drivers, and addressing overcapacity. New forms of building industrialization, exemplified by prefabricated buildings, are rapidly advancing, significantly improving construction standards and quality.

[0003] Researching prefabricated construction technologies for underground projects, achieving standardized design, factory-based prefabrication, mechanized assembly, and information-based management, will help improve engineering construction standards and meet the requirements for high-quality development in the construction industry. Implementing prefabricated design and mechanized assembly for underground projects is a prerequisite for automated, intelligent, and even unmanned construction. Compared to the complex and tedious cast-in-place process, mechanized assembly of prefabricated components offers a simpler technical path for future unmanned construction, providing fundamental technical support for the implementation of new building industrialization and intelligent construction technologies in underground engineering construction.

[0004] Existing construction methods, due to technical limitations, can only be applied to foundation pits without internal supports and are not suitable for assembly construction under internal support systems. Furthermore, component assembly requires close coordination between lifting equipment and assembly devices, requiring human guidance and assistance, making automated assembly difficult.

[0005] The closest technical solution:

[0006] Four patent applications, 202010526910.9, 202010527483.6, 202010526909.6, and 202010527482.1, disclose a prefabricated structure, construction method, and equipment for subway stations, enabling mechanized assembly of the structure. These assembly devices and methods differ significantly from those of the present application, which offers advantages in terms of construction efficiency and cost reduction.

[0007] Patent application 201410390019.1 discloses a method for constructing prefabricated structures for subway stations. This assembly method is significantly different from the present application, and the present application has advantages in terms of construction efficiency and cost reduction.

[0008] Patent applications 201410136708.X and 201410136710.7 disclose a method for constructing prefabricated structures for subway stations. This assembly method is significantly different from the present application, and the present application has advantages in terms of construction efficiency and cost reduction. Summary of the Invention

[0009] In order to overcome the deficiencies of the prior art, the present invention provides a mechanized layered assembly construction structure and a construction method for a prefabricated underground structure.

[0010] The mechanized layered assembly construction structure of the prefabricated underground structure includes: a bottom foundation layer, a backfill layer, prefabricated components and inter-layer connections. The appearance geometry of the bottom foundation layer is rectangular or convex. The backfill layer is the area between the prefabricated components and the foundation pit support structure and the bottom foundation layer. The prefabricated components are prefabricated solid blocks with top openings, bottom openings, or double top and bottom openings. The end structures of the side walls are flat, convex, or concave. The prefabricated components are spatial structures that are assembled layer by layer from bottom to top. The cross-section of the spatial structure is rectangular, arched, or other structural forms. The side walls of the prefabricated components of the same layer have the same size, position, and end structure. After the prefabricated components are connected longitudinally, the end of the side walls form a flat and straight surface. The adjacent layers The positions of the side walls of the prefabricated components correspond to each other, so that the side wall ends of the prefabricated components are butt-connected; the side wall ends of the prefabricated components of adjacent layers adopt a combination of plane and plane, concave and plane, concave and concave, convex and plane, convex and convex, and the interlayer connection part is a structure connecting the upper and lower prefabricated components; the interlayer connection part is connected to the side wall end of the prefabricated component; the interlayer connection part fills the gap formed by the side wall end face structure; the longitudinal connection of the prefabricated components adopts a connection structure of tongue and groove connection, socket connection, bolt connection or prestressed tendon connection system.

[0011] The upper surface of the bottom foundation layer has a flat and straight surface. The trapezoidal opening of the cushion layer has a backfill layer, and there is a backfill layer between the side of the lower component and the enclosing structure. The bottom foundation layer is one of cast-in-place concrete, precast concrete and steel solid blocks. The backfill layer is one of concrete, cement mortar and cement paste. The prefabricated component has at least two side walls. The interlayer connection is a post-construction structure; the height h0 of the interlayer connection is between the fuselage height h1 of the assembly device and the fuselage height h1 of the assembly device plus the elevated height h2, that is, h1<h0

[0012] The mechanized layered assembly construction method of the prefabricated underground structure includes the following steps:

[0013] ​Step 1: Excavation and support of foundation pit. The foundation pit support structure adopts the support scheme of slope reduction, soil nail wall support, pile (wall) anchor support, and pile (wall) bracing support system.

[0014] Step 2: Construct the bottom foundation layer. After the foundation pit is excavated to the bottom, construct the bottom foundation layer.

[0015] Step 3: Assemble the first layer of prefabricated components. After the construction of the bottom foundation layer is completed, the assembly and debugging of the assembly device are carried out. The assembly device is arranged on the bottom foundation layer, and the prefabricated components are hoisted onto the assembly device. The assembly device transports the prefabricated components to the designed position and adjusts the position and posture of the prefabricated components to complete the placement of the prefabricated components. Then the assembly device returns to the starting position and the assembly of the first layer components is completed in sequence.

[0016] Step 4, assemble the second layer of prefabricated components. After the first layer of prefabricated components are assembled, the backfill layer between the first layer of prefabricated components and the foundation pit support structure and the bottom foundation layer is first constructed. After the strength of the backfill layer meets the requirements, for the foundation pit using the pile (wall) support system, the internal support that affects the assembly of the second layer of prefabricated components is removed. For the foundation pit without internal support, or after the internal support is removed, the assembly and debugging of the assembly device are carried out. The assembly device is arranged at the side wall end of the first layer of prefabricated components, and the prefabricated components are hoisted onto the assembly device. The assembly device transports the prefabricated components to the designed position, adjusts the position and posture of the prefabricated components, completes the placement of the prefabricated components, and then the assembly device returns to the starting position to construct the interlayer connection between the first layer of prefabricated components and the second layer of prefabricated components.

[0017] Step 5: Assemble the n-th layer of prefabricated components, repeat step 4 to assemble the second layer of prefabricated components, and complete the assembly of the n-th layer of prefabricated components.

[0018] In step 4, the steps for applying the interlayer connection are as follows:

[0019] For the side wall ends of the prefabricated components of adjacent layers, the plane and the plane are used. First, the upper components are supported by support blocks, and then the assembly device is retreated, and finally the reinforced concrete structure is constructed.

[0020] For the side wall ends of the prefabricated components of adjacent layers that adopt concave to flat surface, concave to concave surface, convex to flat surface, or convex to convex surface, the assembly device can be retreated after the prefabricated components are in place, and then the reinforced concrete structure can be constructed;

[0021] Step 3 or 4 also includes the step of longitudinally connecting the prefabricated components. This longitudinal connection of the prefabricated components utilizes a mature connection scheme using tongue-and-groove connections, socket connections, bolt connections, and prestressed tendon connections. The advantages of the present invention include enabling the modular assembly of the structure under a dense internal support system, including under a cover-and-cut method. Furthermore, the assembly process can be accomplished solely with the assembly device. Automated modification of the assembly device further facilitates automated assembly of components.

[0022] At present, domestic underground structure projects constructed using the open-cut method generally adopt an internal support system. Since the internal support has a great interference and influence on the lifting and assembly of prefabricated components, it is more difficult to promote the prefabricated construction method in underground structure projects. The present invention solves the problem that the prefabricated structure is difficult to implement under the internal support system, and has a great technical driving force for the transformation of underground structure construction from traditional cast-in-place operations to prefabricated and industrialized construction methods. The construction structure and construction method of the present invention are effectively combined with the characteristics and functions of the assembly device, and innovatively propose that when assembling the upper components, the assembly device is arranged on the side wall of the lower component, thereby reducing the diversified demand for construction equipment and realizing the standardization of the construction structure, construction method and construction equipment during the assembly construction of each layer of structure, which can effectively reduce costs, improve work efficiency, and provide a working surface for subsequent processes such as secondary structure and decoration, so as to realize the early construction of subsequent processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] When considered in conjunction with the accompanying drawings, the present invention can be more completely and better understood and its many attendant advantages can be easily known by referring to the following detailed description. However, the drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention, as shown in the figure:

[0024] Figure 1 This is a diagram of the assembled underground structure of the present invention, which is assembled in two layers.

[0025] Figure 2 This is a diagram of the assembled underground structure of the present invention, which is assembled in three layers.

[0026] Figure 3 It is a schematic diagram of the plane-plus-plane structure of the present invention.

[0027] Figure 4 It is a schematic diagram of the plane plus concave structure of the present invention.

[0028] Figure 5 It is a schematic diagram of the concave-on-concave structure of the present invention.

[0029] Figure 6This is a schematic diagram of a plane plus convex structure of the present invention.

[0030] Figure 7 This is a second schematic diagram of the plane plus convex structure of the present invention.

[0031] Figure 8 It is a schematic diagram of the convex-on-convex structure of the present invention.

[0032] Figure 9 It is a schematic diagram of foundation pit excavation of the present invention.

[0033] Figure 10 This is a diagram showing the application of the bottom base layer of the present invention.

[0034] Figure 11 Two diagrams showing the application of the bottom base layer of the present invention.

[0035] Figure 12 This is a schematic diagram of assembling the first layer of prefabricated panels of the present invention and assembling the components in sequence.

[0036] Figure 13 This is a schematic diagram of assembling the first layer of prefabricated panels and applying the backfill layer according to the present invention.

[0037] Figure 14 This is a schematic diagram of assembling the second layer of prefabricated panels of the present invention and assembling the components in sequence.

[0038] Figure 15 This is a schematic diagram of assembling the second layer of prefabricated panels and applying the backfill layer according to the present invention.

[0039] Figure 16 This is a schematic diagram of the structure in which the support blocks of the present invention support the upper prefabricated components.

[0040] Figure 17 It is a schematic diagram of the return structure of the assembling device of the present invention.

[0041] Figure 18 This is a schematic diagram of the structure of the reinforced concrete structure of the present invention, in which the support blocks are retained within the structure.

[0042] Figure 19 This is a schematic diagram of the second-layer prefabricated component placement structure of the present invention.

[0043] Figure 20 It is a schematic diagram of the return structure of the assembling device of the present invention.

[0044] Figure 21 It is a schematic diagram of the reinforced concrete structure of the present invention.

[0045] Figure 22 This is a schematic diagram of the second layer of prefabricated components in place according to the present invention.

[0046] Figure 23It is a schematic diagram of the return of the assembling device of the present invention.

[0047] Figure 24 It is a schematic diagram of the reinforced concrete structure of the present invention.

[0048] Figure 25 It is a structural diagram of the present invention.

[0049] In the figure: foundation 1, internal support 2, retaining structure 3, prefabricated component (open at the bottom) 4, interlayer connection 5, side wall end 6, side wall 7, prefabricated component (open at the top) 8, backfill layer 9, bottom foundation layer 10, prefabricated component (double openings at the top and bottom) 11, assembly device 12, pit bottom 13, upper prefabricated component 14, lower prefabricated component 15, support block 16, concrete structure 17.

[0050] The present invention will be further described below with reference to the accompanying drawings and examples. DETAILED DESCRIPTION

[0051] Obviously, many modifications and variations made by those skilled in the art based on the purpose of the present invention fall within the protection scope of the present invention.

[0052] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element or component is said to be "connected" to another element or component, it can be directly connected to the other element or component, or there may be intermediate elements or components. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0053] Those skilled in the art will understand that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art.

[0054] To facilitate understanding of the embodiments, further explanations will be given below, and each embodiment does not constitute a limitation of the present invention.

[0055] Example 1: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 、 Figure 24 and Figure 25 As shown, the mechanized layered assembly construction structure of the prefabricated underground structure includes: a bottom foundation layer 10, a backfill layer 9, prefabricated components (open at the top) 8, prefabricated components (double openings at the top and bottom) 11, an upper prefabricated component 14, a lower prefabricated component 15, and an interlayer connection part 5.

[0056] The bottom foundation layer 10 is a solid block made of cast-in-place concrete, precast concrete, or steel; the bottom foundation layer 10 can be made of a variety of materials and processes, and the appearance geometric shape of the bottom foundation layer 10 is rectangular or "convex"; the upper surface of the bottom foundation layer 10 should have a high degree of flatness, and the backfill layer 9 is the area between the prefabricated components and the foundation pit support structure and the bottom foundation layer; the backfill layer 9 is concrete, cement mortar, or cement slurry, and the backfill layer 9 can be made of a variety of materials.

[0057] The prefabricated components are prefabricated solid blocks in the form of top opening, bottom opening, or top and bottom double openings (including prefabricated component (top opening) 8, prefabricated component (top and bottom double openings) 11, upper prefabricated component 14, and lower prefabricated component 15).

[0058] The prefabricated component has at least two side walls 7; the wall end structure of the side wall 7 is a flat, convex, or concave structure, and the prefabricated components (including prefabricated components (top opening) 8, prefabricated components (top and bottom double openings) 11, upper prefabricated components 14, and lower prefabricated components 15) are assembled layer by layer from bottom to top to form a larger spatial structure; the cross-sectional form of the spatial structure is rectangular, arched, or other structural forms, and the size, position, and wall end structure of the side walls 7 of the prefabricated components on the same layer are the same, so that after the prefabricated components are longitudinally connected, the side wall ends 6 form a flat and straight surface; the positions of the side walls 7 of the prefabricated components of adjacent layers correspond to each other, so that the side wall ends 6 of the prefabricated components are butt-connected; the prefabricated components of adjacent layers are connected The side wall ends 6 adopt a combination of planes and planes, concave surfaces and planes, concave surfaces and concave surfaces, convex surfaces and planes, and convex surfaces and convex surfaces. The interlayer connection part 5 is a structure that connects the upper and lower prefabricated components; the interlayer connection part 5 is connected to the side wall ends 6 of the prefabricated components; the interlayer connection part 5 fills the gap formed by the structure of the side wall ends 6; the interlayer connection part 5 is a post-construction structure, similar to the post-cast strip in the building structure; the height h0 of the interlayer connection part 5 is between the fuselage height h1 of the assembling device 12 and the fuselage height h1 of the assembling device 12 plus the rising height h2, that is, h1<h0

[0059] Explanation: Assume that the fuselage height of the assembly device 12 is h1 and its raised height is h2, then the height of the interlayer connection part 5 is between h1 and h1+h2. The longitudinal connection of the prefabricated components adopts a mature connection scheme of tongue and groove connection, socket connection, bolt connection, and prestressed tendon connection system. The waterproofing measures for the longitudinal connection joints of the prefabricated components adopt a mature waterproofing scheme of multiple sealing gasket system. The prefabricated components are pre-embedded with necessary conventional embedded parts to meet the needs of lifting and assembly of the components.

[0060] Example 2: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 、 Figure 24 ​and Figure 25 As shown, the mechanized layered assembly construction method of the prefabricated underground structure includes the following steps:

[0061] Step 1: Excavation and support of foundation pit. The foundation pit support structure adopts a mature support scheme of slope reduction, soil nail wall support, pile (wall) anchor support, and pile (wall) bracing support system.

[0062] Step 2: Construct the bottom foundation layer. After the foundation pit is excavated to the bottom, construct the bottom foundation layer.

[0063] Step 3: Figure 12 As shown, after the first layer of prefabricated components are assembled and the bottom foundation layer is constructed, the assembly and debugging of the assembling device 12 is carried out. The assembling device 12 is arranged on the bottom foundation layer, and the prefabricated components are hoisted onto the assembling device 12. The assembling device 12 transports the prefabricated components to the designed position and adjusts the position and posture of the prefabricated components to complete the placement of the prefabricated components. Then, the assembling device 12 returns to the starting position, and the assembly of the first layer components is completed in sequence.

[0064] Step 4, assemble the second layer of prefabricated components. After the first layer of prefabricated components are assembled, the backfill layer between the first layer of prefabricated components and the foundation pit support structure and the bottom foundation layer is first constructed. After the strength of the backfill layer meets the requirements, for the foundation pit using the pile (wall) support system, the internal support that affects the assembly of the second layer of prefabricated components can be removed. For the foundation pit without internal support, or after the internal support is removed, the assembly and debugging of the assembling device 12 is carried out. The assembling device 12 is arranged at the side wall end of the first layer of prefabricated components, and the prefabricated components are hoisted onto the assembling device 12. The assembling device 12 transports the prefabricated components to the designed position, adjusts the position and posture of the prefabricated components, completes the placement of the prefabricated components, and then the assembling device 12 returns to the starting position to construct the interlayer connection between the first layer of prefabricated components and the second layer of prefabricated components.

[0065] Step 5: Assemble the n-th layer of prefabricated components, repeat step 4 to assemble the second layer of prefabricated components, and complete the assembly of the n-th layer of prefabricated components.

[0066] In step 4, the steps for applying the interlayer connection are as follows:

[0067] For the side wall ends of the prefabricated components of adjacent layers, plane to plane is used, such as Figure 16 、 Figure 17 and Figure 18 As shown, first use the support block 16 to support the upper prefabricated component 14, then the assembly device 12 retreats, and finally the reinforced concrete structure is constructed. For the side wall ends of the prefabricated components of adjacent layers, concave and flat, concave and concave, convex and flat, convex and convex are used, as shown in FIG. Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 and Figure 24 As shown, the assembling device 12 can be retreated after the prefabricated components are in place, and then the reinforced concrete structure is constructed.

[0068] Steps 3 and 4 also include the longitudinal connection step of the prefabricated components. The longitudinal connection of the prefabricated components adopts a mature connection scheme of tongue and groove connection, socket connection, bolt connection, and prestressed tendon connection system.

[0069] Example 3: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 、 Figure 24 and Figure 25 As shown, the mechanized layered assembly construction structure of the prefabricated underground structure has the top layer of the foundation as the base layer, and there are enclosure structures on both sides of the foundation. Several supporting structures are connected between the enclosure structures. The base layer is connected to a cushion layer, and the cushion layer has a trapezoidal cross-section or a trapezoidal layer. The lower component is placed above the cushion layer, and the trapezoidal mouth of the cushion layer has a backfill layer. There is a backfill layer between the side of the lower component and the enclosure structure. The assembly device 12 can raise or lower the upper component, and connect the upper component and the lower component by prestressed tendons and steel bars. The steel bars are the main bars connecting the upper component and the lower component. The upper component and the lower component have reserved channels respectively, and prestressed tendons, connectors and steel bars are connected in the reserved channels. The upper component and the lower component have installed connectors respectively, and the connectors are connected to steel bars. The connection between the two steel bars is connected to a mechanical connecting sleeve, and the support block is in the middle of the structure composed of the steel bars and the mechanical connecting sleeve.

[0070] As described above, the embodiments of the present invention have been described in detail. However, it is obvious to those skilled in the art that many variations are possible without departing from the spirit and effects of the present invention. Therefore, all such variations are included within the scope of protection of the present invention.

Claims

1. The mechanized layered assembly construction structure of the prefabricated underground structure is characterized by: It includes: bottom foundation layer, backfill layer, prefabricated components and interlayer connection parts. The appearance geometric shape of the bottom foundation layer is convex; the backfill layer is the part between the prefabricated components, the foundation pit support structure and the bottom foundation layer; The prefabricated components are prefabricated solid blocks with top opening, bottom opening, or top and bottom double openings; the wall end structure of the side wall is a flat surface, convex surface, or concave surface structure, and the prefabricated components are spatial structures assembled layer by layer from bottom to top; the cross-section of the spatial structure is rectangular, arched, or other structural forms, and the side walls of the prefabricated components on the same layer are the same in size, position, and wall end structure. After the prefabricated components are longitudinally connected, the side wall ends form a flat and straight surface; the positions of the side walls of the prefabricated components on adjacent layers correspond to each other, so that the side wall ends of the prefabricated components are butt-connected; the side wall ends of the prefabricated components on adjacent layers adopt a combination of flat surface to flat surface, concave surface to flat surface, concave surface to concave surface, convex surface to flat surface, or convex surface to convex surface. The interlayer connection is a structure that connects the prefabricated components of the upper and lower layers; the interlayer connection is connected to the wall end of the side wall of the prefabricated component; the interlayer connection fills the gap formed by the side wall end surface structure; the longitudinal connection of the prefabricated components adopts a connection structure of tongue and groove connection, socket connection, bolt connection, or prestressed tendon connection system; The upper surface of the bottom foundation layer has a flat and straight surface; the trapezoidal opening of the cushion layer has a backfill layer; the side of the lower component and the surrounding structure have a backfill layer; the bottom foundation layer is one of cast-in-place concrete, precast concrete and steel solid blocks; the backfill layer is one of concrete, cement mortar and cement paste; the precast component has at least two side walls; The interlayer connection part is a post-construction structure; the height h0 of the interlayer connection part is between the fuselage height h1 of the assembly device and the fuselage height h1 plus the height h2 of the assembly device, that is, h1<h0<h1+h2. The fuselage height of the assembly device is h1 and the height is h2. The height of the interlayer connection part is between h1 and h1+h2. The longitudinal connection seams of the prefabricated components adopt a multi-sealing gasket structure. For the side wall ends of the prefabricated components of adjacent layers, if the ends are flat and flat, first use the support blocks to support the upper components, then the assembly device retreats, and finally the reinforced concrete structure is constructed. For the side wall ends of the prefabricated components of adjacent layers, if the ends are concave and flat, concave and concave, convex and flat, or convex and convex, the assembly device can retreat after putting the prefabricated components in place, and then the reinforced concrete structure is constructed.

2. The construction method of the mechanized layered assembly construction structure of the prefabricated underground structure according to claim 1 is characterized in that: The steps include: Step 1: Excavation and support of foundation pit. The foundation pit support structure adopts the support scheme of slope reduction, soil nail wall support, pile wall anchor support, and pile wall support system. Step 2: Construct the bottom foundation layer. After the foundation pit is excavated to the bottom, construct the bottom foundation layer. Step 3: Assemble the first layer of prefabricated components. After the construction of the bottom foundation layer is completed, the assembly and debugging of the assembly device are carried out. The assembly device is arranged on the bottom foundation layer, and the prefabricated components are hoisted onto the assembly device. The assembly device transports the prefabricated components to the designed position and adjusts the position and posture of the prefabricated components to complete the placement of the prefabricated components. Then the assembly device returns to the starting position and the assembly of the first layer components is completed in sequence. Step 4, assemble the second layer of prefabricated components. After the first layer of prefabricated components are assembled, the backfill layer between the first layer of prefabricated components and the foundation pit support structure and the bottom foundation layer is first constructed. After the strength of the backfill layer meets the requirements, for the foundation pit using the pile wall support system, the internal support that affects the assembly of the second layer of prefabricated components is removed. For the foundation pit without internal support, or after the internal support is removed, the assembly and debugging of the assembly device is carried out. The assembly device is arranged at the side wall end of the first layer of prefabricated components, and the prefabricated components are hoisted onto the assembly device. The assembly device transports the prefabricated components to the designed position, adjusts the position and posture of the prefabricated components, completes the placement of the prefabricated components, and then the assembly device returns to the starting position to construct the interlayer connection between the first layer of prefabricated components and the second layer of prefabricated components. Step 5: Assemble the nth layer of prefabricated components, repeat step 4 to assemble the second layer of prefabricated components, and complete the assembly of the nth layer of prefabricated components; In step 4, the steps for applying the interlayer connection are as follows: For the side wall ends of the prefabricated components of adjacent layers, the plane and the plane are used. First, the upper components are supported by support blocks, and then the assembly device is retreated, and finally the reinforced concrete structure is constructed. For the side wall ends of the prefabricated components of adjacent layers that adopt concave to flat surface, concave to concave surface, convex to flat surface, or convex to convex surface, the assembly device can be retreated after the prefabricated components are in place, and then the reinforced concrete structure can be constructed; Step 3 or step 4 also includes a step of longitudinal connection of prefabricated components. The longitudinal connection of prefabricated components adopts a mature connection scheme of tongue and groove connection, socket connection, bolt connection, and prestressed tendon connection system.

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