Fabricated building reverse construction method and fabricated underground building

Abstract

The invention belongs to the technical field of building engineering, and discloses a fabricated building reverse construction method and a fabricated underground building. The fabricated building reverse construction method comprises the steps that S1, a plurality of prefabricated middle stand columns are connected through inter-column connecting structures, column end connecting structures are pre-buried at the ends of the prefabricated middle stand columns on the bottommost layer, and the prefabricated middle stand columns on the bottommost layer are connected with a cast-in-place pile reinforcement cage; s2, a pile hole is drilled to the designated depth, a cast-in-situ bored pile is poured to a cast-in-situ pile reinforcement cage to the bottom of the bottom plate structure, and the multiple prefabricated middle stand columns, the inter-column connecting structures between every two adjacent prefabricated middle stand columns, the column end connecting structures and the cast-in-situ bored pile are connected into an integrated supporting column structure; s3, side walls are constructed; s4, constructing a middle layer; s6, the step S5 is repeated until all the middle layers are constructed; and S7, a bottom layer is constructed. According to the fabricated underground building, prefabrication of building components is achieved, the construction time is greatly shortened, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a reverse construction method for an assembled building and an assembled underground building. Background Art

[0002] At present, cities are increasingly adopting the reverse construction method when carrying out the construction of prefabricated subway stations. In the reverse construction method for soft soil areas, multiple supporting structures are usually set up inside the building, the vertical spacing between the supporting structures is small, and the lattice columns are set on one side of the central axis. There is not enough space inside the station to run large-scale equipment; at the same time, the reverse construction method for underground buildings currently mostly uses the method of pouring various building components on site, and it is impossible to use prefabricated components on a large scale for prefabricated building construction, resulting in low construction efficiency and large concrete usage.

[0003] Therefore, it is urgent to design a reverse construction method to solve the above-mentioned technical problems existing in the prior art. Summary of the invention

[0004] The object of the present invention is to provide a reverse construction method for prefabricated buildings and prefabricated underground buildings, which can reduce the construction time of underground buildings, improve construction efficiency, and increase the prefabrication assembly rate.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The reverse construction method of prefabricated buildings includes:

[0007] S1. Connect multiple prefabricated center columns through an inter-column connection structure, embed a column end connection structure at the end of the prefabricated center column at the bottom layer, and connect the prefabricated center column at the bottom layer to the cast-in-place pile reinforcement cage;

[0008] S2, drilling pile holes to a specified depth, hoisting a plurality of the prefabricated center columns, the column connection structure between two adjacent prefabricated center columns, the column end connection structure, and the cast-in-place pile reinforcement cage into the pile holes, and then pouring bored cast-in-place piles at the cast-in-place pile reinforcement cage to the bottom of the base plate structure, so that the plurality of the prefabricated center columns, the column connection structure between two adjacent prefabricated center columns, the column end connection structure, and the bored cast-in-place piles are connected into an integrated support column structure;

[0009] S3, construction of side walls;

[0010] S4, excavating the soil downward to the top plate construction surface, splicing the prefabricated top longitudinal beam with the prefabricated central column at the top layer and casting them into one body, and then splicing the prefabricated top plate with the prefabricated top longitudinal beam and casting them into one body;

[0011] S5, continue to excavate the soil downward to the middle plate construction surface, splice and cast the prefabricated middle longitudinal beam and the column connection structure between two adjacent middle columns into one body, then splice and cast the prefabricated middle plate and the prefabricated middle longitudinal beam into one body, and cast the connection node between the prefabricated middle plate and the side wall at the same time;

[0012] S6, repeat step S5 until all the middle layers are constructed;

[0013] S7, excavating the soil downward to the bottom plate construction surface, binding and connecting the steel bars of the bottom plate structure to the column end connection structure, and then casting the bottom plate structure.

[0014] Preferably, step S3 specifically includes:

[0015] constructing a ground wall outside the side wall construction position;

[0016] The construction position of the side wall is reinforced by cement soil jetting to form a reinforced soil body;

[0017] The prefabricated wall panels are inserted into the reinforced soil body in close contact with the ground wall.

[0018] Preferably, step S3 further includes:

[0019] The heights of two adjacent prefabricated wall panels in the horizontal direction are different.

[0020] Preferably, step S4 further includes:

[0021] Top plate construction holes are reserved between the prefabricated top plates, and the top plate construction holes are used for excavating the soil downwards.

[0022] Preferably, after the bottom plate structure is cast, the top plate construction holes are sealed.

[0023] Preferably, before excavating the soil to the bottom of the base plate structure in step S7, the method further includes:

[0024] A horizontal support steel frame is arranged between the middle plate construction surface and the bottom plate construction surface, and two ends of the support steel frame are respectively connected to the side walls on both sides.

[0025] Preferably, after the base plate structure is cast, the supporting steel frame is removed.

[0026] Preferably, step S5 further includes:

[0027] Middle plate construction holes are reserved between the prefabricated middle plates, and the middle plate construction holes are used for excavating the soil.

[0028] Preferably, after the bottom plate structure is cast, the construction holes of the middle plate are sealed.

[0029] The prefabricated underground building is constructed by the above-mentioned prefabricated building reverse construction method, and the prefabricated underground building includes:

[0030] A support column structure, the support column structure comprising a plurality of prefabricated center columns, a column end connection structure and bored cast-in-place piles arranged in sequence along the vertical direction, two adjacent prefabricated center columns being connected by an inter-column connection structure, the column end connection structure being anchored on the prefabricated center column at the bottom layer, the bored cast-in-place piles being connected to the prefabricated center column at the bottom layer, and the column end connection structure being in abutment with the bored cast-in-place piles;

[0031] A side wall, the side wall comprising a plurality of prefabricated wall panels spliced ​​to each other;

[0032] A prefabricated roof structure, wherein the prefabricated roof structure is connected to the prefabricated central column at the top layer, and an end of the prefabricated roof structure is connected to the side wall;

[0033] A prefabricated middle plate structure, wherein the prefabricated middle plate structure is connected to the inter-column connection structure, and an end of the prefabricated middle plate structure is connected to the side wall;

[0034] A bottom plate structure, wherein the bottom plate structure is connected to the column end structure and anchored, and an end of the bottom plate structure is connected to the side wall;

[0035] A bottom layer space is formed between the prefabricated middle plate structure at the bottom layer and the bottom plate structure, an intermediate layer space is formed between two vertically adjacent prefabricated middle plate structures, and a top layer space is formed between the prefabricated middle plate structure at the top layer and the prefabricated top plate structure.

[0036] The beneficial effects of the present invention are:

[0037] The reverse construction method of prefabricated buildings provided by the present invention, during construction, the bored pile steel cage is used to cast the bored piles, so that the support column structure and the surrounding soil form an integrated structure, the bored piles after solidification have strong bearing capacity and can withstand high horizontal and vertical loads, thereby ensuring the safety and stability of the building; the prefabricated center longitudinal beam is connected to the column connection structure and then cast into one piece, similarly, the steel bars of the bottom plate structure are first tied and connected to the column end connection structure and then cast into one piece, thereby ensuring the connection strength and connection stability between the prefabricated center longitudinal beam and the support column structure, and between the bottom plate structure and the support column structure; because the prefabricated center column, prefabricated top longitudinal beam, prefabricated top plate, prefabricated center longitudinal beam and prefabricated center plate are all prefabricated components, they can be directly transported to the construction site for installation, which greatly improves the construction efficiency and shortens the construction period.

[0038] The prefabricated underground building provided by the present invention is constructed using the reverse construction method of the prefabricated building, which realizes the prefabrication of the side walls, top plate structure, middle plate structure and supporting column structure, greatly shortens the construction time of the underground building, improves the construction efficiency, and saves the amount of concrete used, meeting the national green and environmentally friendly construction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a construction schematic diagram of a support column structure and a side wall provided in a specific embodiment of the present invention;

[0040] Figure 2 It is a structural schematic diagram of an assembled underground building provided by a specific embodiment of the present invention;

[0041] Figure 3 It is a structural schematic diagram of a plurality of prefabricated center columns connected as a whole, an inter-column connection structure between two adjacent prefabricated center columns, a column end connection structure, and a cast-in-place pile reinforcement cage provided by a specific embodiment of the present invention.

[0042] In the figure:

[0043] 100-ground wall;

[0044] 200-Supporting steel frame;

[0045] 1- support column structure; 11- prefabricated central column; 12- column connection structure; 13- column end connection structure; 14- cast-in-place pile reinforcement cage; 15- bored cast-in-place pile;

[0046] 2- Prefabricated wall panels;

[0047] 3-prefabricated roof structure; 31-prefabricated top longitudinal beam; 32-prefabricated roof;

[0048] 4-prefabricated middle plate structure; 41-prefabricated middle longitudinal beam; 42-prefabricated middle plate;

[0049] 5- Bottom plate structure. DETAILED DESCRIPTION

[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0051] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0054] like Figures 1 to 3 As shown, the present invention provides a method for reverse construction of an assembled building, and the method for reverse construction of an assembled building comprises:

[0055] S1. Connect multiple prefabricated central columns 11 through the inter-column connection structure 12, embed the column end connection structure 13 at the end of the bottom prefabricated central column 11, and connect the bottom prefabricated central column 11 to the cast-in-place pile reinforcement cage 14. In this embodiment, a plurality of prefabricated central columns 11, inter-column connection structures 12, column end connection structures 13 and cast-in-place pile reinforcement cages 14 are prefabricated and connected in sequence before excavating the soil; specifically, a support column structure 1 having two prefabricated central columns 11 after casting is taken as an example for explanation as follows: the inter-column connection structure 12 includes a first connection member and a second connection member, the first connection member is anchored into the prefabricated central column 11 of the upper layer, the second connection member and the column end connection structure 13 are both anchored into the prefabricated central column 11 of the lower layer, and then the first connection member and the second connection member are connected and fixed using bolts and nuts, and then the main reinforcement of the lower prefabricated central column 11 is connected to the cast-in-place pile reinforcement cage 14 at the lowest end through a reinforcement connector; it can be understood that the number of the inter-column connection structures 12 is the same as the number of the intermediate layers. For example, if the prefabricated underground building has one intermediate layer (i.e., only one prefabricated middle plate structure), the support column structure 1 has two prefabricated central columns 11, and the number of the inter-column connection structures 12 is one.

[0056] S2. Drill pile holes to a specified depth, hoist a plurality of precast center columns 11, a column connection structure 12 between two adjacent precast center columns 11, a column end connection structure 13, and a cast-in-place pile reinforcement cage 14 into the pile holes, and then cast bored cast-in-place piles 15 at the cast-in-place pile reinforcement cage 14 to the bottom of the base plate structure 5, so that the plurality of precast center columns 11, a column connection structure 12 between two adjacent precast center columns 11, a column end connection structure 13, and a bored cast-in-place pile 15 are connected into an integrated support column structure 1. In this embodiment, firstly, according to the diameter of the precast center column 11, a pile hole is drilled at a designated construction position to the bottom plate construction surface, and then according to the diameter of the bored cast-in-place pile 15 to be constructed, the pile hole is continued to be drilled downward to a predetermined design depth; after the drilling is completed, a plurality of precast center columns 11 connected as a whole, the column connection structure 12 between two adjacent precast center columns 11, the column end connection structure 13 and the cast-in-place pile reinforcement cage 14 are hoisted into the pile hole, and then the construction personnel sequentially pass the pipe of the concrete pouring equipment through the grouting channel inside the upper precast center column 11, the grouting sleeves inside the first connecting member and the second connecting member, the grouting channel inside the lower precast center column 11 and the grouting sleeves of the column end connection structure 13, and extend it into the cast-in-place pile reinforcement cage 14 of the bottom layer, and pour concrete to form the bored cast-in-place pile 15, thereby forming an integral support column structure 1 connected along the length direction.

[0057] S3, constructing the side wall. In this embodiment, a wall inserting machine is used to insert a plurality of prefabricated wall panels 2 into the soil in sequence at a designated side wall construction position, thereby forming the side wall.

[0058] S4, excavate the soil downward to the top plate construction surface, splice the prefabricated top longitudinal beam 31 with the topmost prefabricated center column 11 and cast them into one, then splice the prefabricated top plate 32 with the prefabricated top longitudinal beam 31 and cast them into one. In this embodiment, the soil on both sides of the foundation pit is sloped with a slope of 1:1, and the depth reaches the top plate construction surface; then the prefabricated top longitudinal beam 31 is first spliced ​​to the periphery of the upper center column 11, and concrete is poured at the joints, and then the prefabricated top plate 32 is spliced ​​around the prefabricated top longitudinal beam 31, and concrete is poured at the joints in the same way, so that the prefabricated top longitudinal beam 31 and the prefabricated top plate 32 form an integral prefabricated top plate structure 3. Specifically, the top plate construction surface is the soil surface located below the prefabricated top plate structure 3 to be constructed, and is convenient for construction personnel to assemble the prefabricated top longitudinal beam 31 and the prefabricated top plate 32.

[0059] S5, continue to excavate the soil downward to the middle plate construction surface, splice and cast the prefabricated middle longitudinal beam 41 and the column connection structure 12 between the two adjacent middle columns 11 into one piece, then splice and cast the prefabricated middle plate 42 and the prefabricated middle longitudinal beam 41 into one piece, and cast the connection node between the prefabricated middle plate 42 and the side wall at the same time. In this embodiment, after the top layer construction is completed, continue to excavate the soil downward to the middle plate construction surface, the construction personnel tie and connect the steel bars of the prefabricated middle longitudinal beam 41 with the column connection structure 12, and pour concrete into the joint between the prefabricated middle longitudinal beam 41 and the column connection structure 12, so as to complete the connection between the prefabricated middle longitudinal beam 41 and the column connection structure 12, then splice the prefabricated middle plate 42 around the prefabricated middle longitudinal beam 41, and similarly pour concrete at the joint, so that the prefabricated middle longitudinal beam 41 and the prefabricated middle plate 42 form an integral prefabricated middle plate structure 4. Specifically, the column connection structure 12 includes a first connection member anchored at the end of the upper prefabricated middle column 11 and a second connection member anchored at the end of the lower prefabricated middle column 11, the first connection member is connected to the second connection member by bolts, and anchor holes are provided on the first connection member and the second connection member, the prefabricated middle longitudinal beam 41 is assembled on the periphery of the column connection structure 12, and the steel bars of the prefabricated middle longitudinal beam 41 are inserted into the anchor holes and tied, and then concrete is poured into the joint between the prefabricated middle longitudinal beam 41 and the column connection structure 12, and the concrete will flow into the first connection member and the second connection member through the anchor holes and fill the first connection member and the second connection member, thereby covering the steel bars in the anchor holes tightly to ensure the stability and firmness of the connection between the two. It can be understood that the middle plate construction surface is located below the prefabricated middle plate structure 4 to be constructed and is convenient for construction personnel to assemble the prefabricated middle longitudinal beam 41 and the prefabricated middle plate 42.

[0060] S6, repeat step S5 until all the intermediate layers are constructed. In this embodiment, the prefabricated underground building has only one intermediate layer, so step S6 is not required, and the soil is directly excavated to the bottom plate construction surface. In another embodiment, the prefabricated underground building has multiple intermediate layers, and the soil needs to be excavated continuously, and the intermediate layers of each layer are constructed in sequence according to the same method as in S5.

[0061] S7, excavate the soil downward to the bottom plate construction surface, tie and connect the steel bars of the bottom plate structure 5 with the column end connection structure 13, and then cast the bottom plate structure 5. In this embodiment, after the construction of the middle layer is completed, the soil is excavated downward to the bottom plate construction surface, and then the construction personnel tie and connect the steel bars of the bottom plate structure 5 to be cast with the column end connection structure 13, and then cast the bottom plate structure 5 in a formwork; specifically, the column end connection structure 13 is anchored at the end of the prefabricated middle column 11 of the lower layer, and an anchor hole is opened on the column end connection structure 13. The steel bars of the bottom plate structure 5 to be cast are extended into the anchor hole and tied, and then concrete is built in the mold. The concrete will flow into the interior of the column end connection structure 13 through the anchor hole and fill the column end connection structure 13, thereby covering the steel bars in the anchor hole tightly to ensure the stability and firmness of the connection between the two. It can be understood that the bottom plate construction surface is located below the bottom plate structure 5 to be cast and is convenient for construction personnel to construct.

[0062] In the above-mentioned reverse construction method of prefabricated building, during construction, the cast-in-place pile steel cage 14 is used to cast the bored cast-in-place piles 15, so that the support column structure 1 forms an integrated structure with the surrounding soil. The bored cast-in-place piles 15 after solidification have strong bearing capacity and can withstand high horizontal and vertical loads, thereby ensuring the safety and stability of the building; the prefabricated middle longitudinal beam 41 is connected to the inter-column connection structure 12 and then cast into one piece. Similarly, the steel bars of the bottom plate structure 5 are first tied and connected to the column end connection structure 13 and then cast into one piece, thereby ensuring the connection strength and connection stability between the prefabricated middle longitudinal beam 41 and the support column structure 1, and between the bottom plate structure 5 and the support column structure 1; since the prefabricated middle column 11, the prefabricated top longitudinal beam 31, the prefabricated top plate 32, the prefabricated middle longitudinal beam 41 and the prefabricated middle plate 42 are all prefabricated components, they can be directly transported to the construction site for installation, which greatly improves the construction efficiency and shortens the construction period.

[0063] Furthermore, step S3 specifically includes: constructing a ground wall 100 outside the side wall construction position; using cement soil rotary grouting to reinforce the side wall construction position to form a reinforced soil body; inserting the prefabricated wall panel 2 and the ground wall 100 close to each other into the reinforced soil body. In this embodiment, before constructing the side wall, first construct the ground wall 100 outside the side wall construction position, and the depth of the ground wall 100 is greater than the depth of the side wall; then cement soil rotary grouting reinforcement is performed at the side wall construction position, and the prefabricated wall panel 2 is inserted into the reinforced soil body using a wall inserter; specifically, rotary grouting reinforcement refers to using rotary grouting piles to spray cement slurry into the soil layer and mix it with the soil body through high-pressure rotary grouting to form a continuously overlapped cement reinforcement body, thereby improving the bearing capacity and stability of the foundation, which is a commonly used soil reinforcement method in the field.

[0064] Specifically, step S3 further includes: the heights of two adjacent prefabricated wall panels 2 in the horizontal direction are different. In this embodiment, the height of the prefabricated wall panel 2 is less than the overall height of the side wall to be constructed, so multiple prefabricated wall panels 2 need to be continuously inserted vertically, and multiple prefabricated wall panels 2 need to be continuously inserted horizontally to form a complete side wall; specifically, the heights of two adjacent prefabricated wall panels 2 in the horizontal direction are different to avoid forming a continuous full-length seam in the horizontal direction after the prefabricated wall panels 2 are inserted, thereby improving the overall stability and strength of the side wall.

[0065] Furthermore, step S4 also includes: reserving top plate construction holes between the prefabricated top plates 32, and the top plate construction holes are used to excavate the soil downward. In this embodiment, when constructing the top layer, the construction personnel reserve top plate construction holes between two adjacent prefabricated top plates 32, so that the construction personnel and construction equipment can smoothly continue to construct downward.

[0066] Specifically, after the bottom plate structure 5 is cast, the top plate construction holes are blocked. In this embodiment, after the bottom plate structure 5 is constructed, the construction personnel return to the prefabricated top plate structure 3, use the prefabricated top plate 32 to block the top plate construction holes, and cast the prefabricated top plate 32 blocking the top plate construction holes into one piece with the surrounding prefabricated top plates 32.

[0067] Furthermore, if Figure 2 As shown, before excavating the soil to the bottom of the bottom plate structure 5 in step S7, it also includes: setting a horizontal support steel frame 200 between the middle plate construction surface and the bottom plate construction surface, and the two ends of the support steel frame 200 are respectively connected to the side walls on both sides. In this embodiment, in the process of completing the construction of the middle layer and excavating the soil downward, the construction personnel set a horizontal support steel frame 200 between the middle plate construction surface and the bottom plate construction surface according to the actual situation on site, and the two ends of the support steel frame 200 are respectively fixed to the side walls on both sides, so as to support the enclosure structure, prevent the side wall support from being unstable due to the excessive height of the bottom space, and ensure the safety and reliability of the construction.

[0068] Specifically, after the bottom plate structure 5 is poured, the supporting steel frame 200 is removed. In this embodiment, after the bottom plate structure 5 is constructed, the construction personnel remove the supporting steel frame 200 to form a completed bottom floor space.

[0069] Furthermore, step S5 also includes: reserving middle plate construction holes between the prefabricated middle plates 42, and the middle plate construction holes are used for excavating the soil. In this embodiment, when constructing the middle layer, the construction personnel reserve middle plate construction holes between two adjacent prefabricated middle plates 42, so that the construction personnel and construction equipment can smoothly continue to construct downward.

[0070] Specifically, after the bottom plate structure 5 is cast, the middle plate construction holes are blocked. In this embodiment, after the bottom plate structure 5 is constructed, the construction personnel will return to each prefabricated middle plate structure 4 layer by layer, use the prefabricated middle plate 42 to block the middle plate construction holes, and cast the prefabricated middle plate 42 that blocks the middle plate construction holes into one piece with the surrounding prefabricated middle plates 42. It can be understood that after the middle plate construction holes on each prefabricated middle plate structure 4 are blocked, the construction personnel will return to the prefabricated top plate structure 3 to block the top plate construction holes.

[0071] like Figure 2 and 3 As shown, the present embodiment also provides a prefabricated underground building, which is constructed by the above-mentioned reverse construction method of prefabricated buildings. The prefabricated underground building includes a support column structure 1, a side wall, a prefabricated top plate structure 3, a prefabricated middle plate structure 4 and a bottom plate structure 5. Specifically, the support column structure 1 includes a plurality of prefabricated center columns 11, a column end connection structure 13 and bored cast-in-place piles 15 arranged in sequence along the vertical direction, two adjacent prefabricated center columns 11 are connected by an inter-column connection structure 12, the column end connection structure 13 is anchored on the bottom prefabricated center column 11, the bored cast-in-place piles 15 are connected to the bottom prefabricated center column 11, and the column end connection structure 13 is in contact with the bored cast-in-place piles 15; the side wall includes a plurality of prefabricated wall panels 2 spliced ​​to each other; the prefabricated top plate structure 3 is connected to the top prefabricated wall panels 2 ... The prefabricated middle plate structure 4 is connected to the center column 11, and the end of the prefabricated top plate structure 3 is connected to the side wall; the prefabricated middle plate structure 4 is connected to the column connection structure 12, and the end of the prefabricated middle plate structure 4 is connected to the side wall; the bottom plate structure 5 is anchored to the column end connection structure 13, and the end of the bottom plate structure 5 is connected to the side wall; a bottom space is formed between the bottom prefabricated middle plate structure 4 and the bottom plate structure 5, an intermediate layer space is formed between the two vertically adjacent layers of prefabricated middle plate structures 4, and a top layer space is formed between the top prefabricated middle plate structure 4 and the prefabricated top plate structure 3.

[0072] In this embodiment, a supporting column structure 1 having two prefabricated center columns 11 after casting is taken as an example for explanation as follows: the inter-column connection structure 12 includes a first connecting member anchored into the end of the upper prefabricated center column 11 and a second connecting member anchored into the end of the lower prefabricated center column 11, respectively, the first connecting member and the second connecting member are both rectangular hollow cylindrical structures, and the first connecting member and the second connecting member are connected by bolts; a plurality of anchor holes are provided on the cylinder wall of the first connecting member and the second connecting member for passing the steel bars of the prefabricated center longitudinal beam 41 through and binding them, and casting ports are also provided on the cylinder wall of the first connecting member and the second connecting member, so that concrete can be quickly poured into the interior of the first connecting member and the second connecting member and tightly cover the steel bars of the prefabricated center longitudinal beam 41. The column end connection structure 13 is anchored into the other end of the lower prefabricated central column 11. The column end connection structure 13 is also a rectangular hollow cylindrical structure. A plurality of anchor holes are provided on the cylinder wall of the column end connection structure 13 for inserting and tying the steel bars of the bottom plate structure 5 to be cast. A plurality of pouring ports are also provided on the cylinder wall of the column end connection structure 13 so that concrete can be quickly poured into the column end connection structure 13 and tightly cover the steel bars of the bottom plate structure 5. Furthermore, the main reinforcement of the lower prefabricated central column 11 is connected to the cast-in-place pile reinforcement cage 14 through a steel bar connector, and the cast-in-place bored cast-in-place pile 15 abuts against the column end connection structure 13.

[0073] Specifically, the prefabricated center column 11 has a grouting channel running through it along its length direction, and the first connecting member, the second connecting member and the column end connecting structure 13 have grouting sleeves inside. Therefore, when pouring the bored cast-in-place piles 15, the construction workers can extend the pipe of the concrete pouring equipment on the ground to the bottom layer of the cast-in-place pile reinforcement cage 14, thereby successfully completing the pouring of the bored cast-in-place piles 15.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The reverse construction method of prefabricated building is characterized by: include: S1, connecting a plurality of prefabricated center columns (11) through an inter-column connection structure (12), embedding a column end connection structure (13) at the end of the prefabricated center column (11) at the bottom layer, and connecting the prefabricated center column (11) at the bottom layer to a cast-in-place pile reinforcement cage (14); S2, drilling a pile hole to a specified depth, hoisting a plurality of the prefabricated center columns (11), the column connection structure (12) between two adjacent prefabricated center columns (11), the column end connection structure (13) and the cast-in-place pile reinforcement cage (14) into the pile hole, and then pouring a bored cast-in-place pile (15) to the bottom of the base plate structure (5) at the cast-in-place pile reinforcement cage (14), so that the plurality of the prefabricated center columns (11), the column connection structure (12) between two adjacent prefabricated center columns (11), the column end connection structure (13) and the bored cast-in-place pile (15) are connected to form an integrated support column structure (1); S3, construction of side walls; S4, excavating the soil downward to the top plate construction surface, splicing and casting the prefabricated top longitudinal beam (31) and the prefabricated central column (11) at the top layer into one piece, and then splicing and casting the prefabricated top plate (32) and the prefabricated top longitudinal beam (31) into one piece; S5, continue to excavate the soil downward to the middle plate construction surface, splice and cast the prefabricated middle longitudinal beam (41) and the inter-column connection structure (12) between two adjacent middle columns (11) into one piece, then splice and cast the prefabricated middle plate (42) and the prefabricated middle longitudinal beam (41) into one piece, and simultaneously cast the connection node between the prefabricated middle plate (42) and the side wall; S6, repeat step S5 until all the middle layers are constructed; S7, excavating the soil downward to the bottom plate construction surface, tying and connecting the steel bars of the bottom plate structure (5) to the column end connection structure (13), and then casting the bottom plate structure (5).

2. The reverse construction method of prefabricated building according to claim 1, characterized in that: Step S3 specifically includes: Constructing a ground wall (100) outside the side wall construction position; The construction position of the side wall is reinforced by cement soil jetting to form a reinforced soil body; The prefabricated wall panels (2) are inserted into the reinforced soil body in close contact with the ground wall (100).

3. The method for reverse construction of prefabricated buildings according to claim 2, characterized in that: Step S3 also includes: The heights of two adjacent prefabricated wall panels (2) in the horizontal direction are different.

4. The method for reverse construction of prefabricated buildings according to claim 1, characterized in that: Step S4 also includes: Top plate construction holes are reserved between the prefabricated top plates (32), and the top plate construction holes are used for excavating the soil downwards.

5. The method for reverse construction of prefabricated buildings according to claim 4 is characterized in that: After the bottom plate structure (5) is cast, the top plate construction holes are sealed.

6. The method for reverse construction of prefabricated buildings according to claim 1, characterized in that: Before excavating the soil to the bottom of the base plate structure (5) in step S7, the process further includes: A horizontal support steel frame (200) is arranged between the middle plate construction surface and the bottom plate construction surface, and two ends of the support steel frame (200) are respectively connected to the side walls on both sides.

7. The reverse construction method of prefabricated building according to claim 6, characterized in that: After the casting of the base plate structure (5) is completed, the supporting steel frame (200) is removed.

8. The method for reverse construction of prefabricated buildings according to claim 1, characterized in that: Step S5 also includes: Middle plate construction holes are reserved between the prefabricated middle plates (42), and the middle plate construction holes are used for excavating the soil.

9. The reverse construction method of prefabricated building according to claim 8, characterized in that: After the bottom plate structure (5) is cast, the construction holes of the middle plate are sealed.

10. Prefabricated underground building, characterized in that: The prefabricated underground building is constructed by the reverse construction method of the prefabricated building according to any one of claims 1 to 9, and the prefabricated underground building comprises: A support column structure (1), the support column structure (1) comprising a plurality of prefabricated center columns (11), a column end connection structure (13) and bored cast-in-place piles (15) arranged in sequence along the vertical direction, two adjacent prefabricated center columns (11) being connected via an inter-column connection structure (12), the column end connection structure (13) being anchored on the prefabricated center column (11) at the bottom layer, the bored cast-in-place piles (15) being connected to the prefabricated center column (11) at the bottom layer, and the column end connection structure (13) being in abutment with the bored cast-in-place piles (15); A side wall, the side wall comprising a plurality of prefabricated wall panels (2) spliced ​​together; A prefabricated top plate structure (3), wherein the prefabricated top plate structure (3) is connected to the prefabricated central column (11) at the top layer, and the end of the prefabricated top plate structure (3) is connected to the side wall; A prefabricated middle plate structure (4), wherein the prefabricated middle plate structure (4) is connected to the inter-column connection structure (12), and an end of the prefabricated middle plate structure (4) is connected to the side wall; A bottom plate structure (5), the bottom plate structure (5) being anchored to the column end connection structure (13), and the end of the bottom plate structure (5) being connected to the side wall; A bottom layer space is formed between the prefabricated middle plate structure (4) at the bottom layer and the bottom plate structure (5), an intermediate layer space is formed between two vertically adjacent layers of the prefabricated middle plate structure (4), and a top layer space is formed between the prefabricated middle plate structure (4) at the top layer and the prefabricated top plate structure (3).

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