Flat prefabricated raft foundation and construction method

Abstract

The present invention provides a flat prefabricated raft foundation and a construction method. The flat prefabricated raft foundation includes an under-column plate, an inter-column plate and a mid-span plate. A first steel section and a second steel section are provided in the under-column plate; the inter-column plates are arranged horizontally or vertically between two adjacent under-column plates, and a third steel section is provided in the inter-column plate; the mid-span plate is arranged in the rectangular space enclosed by the inter-column plates; the first steel section and the third steel section, the second steel section and the third steel section, and between two adjacent third steel sections are all connected by steel connection components, and the horizontally arranged mid-span plates and between the horizontally arranged inter-column plates and mid-span plates are respectively connected by mid-span connectors. For the flat prefabricated raft foundation provided by the present invention, the under-column plates, the inter-column plates and the mid-span plates can be prefabricated and processed in a factory, and then assembled and connected through steel connection components, mid-span connectors, connecting steel bars, first steel bars and second steel bars, greatly improving the construction efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of raft foundations, and more specifically, relates to a flat prefabricated raft foundation and a construction method thereof. Background Art

[0002] In the power industry, most of the foundations used in buildings such as substations are cast-in-place foundations. Cast-in-place foundations have disadvantages such as complex construction, long construction periods, difficult control of construction quality, and greater environmental impact. Currently, prefabricated foundations are gradually used in transmission lines, which can shorten the construction period, facilitate ensuring construction quality, and save labor. However, existing prefabricated foundations mostly have problems such as insufficient structural strength, low prefabrication rate, and low standardization degree, which affect the assembly quality and assembly efficiency of raft foundations. Summary of the Invention

[0003] The purpose of the present invention is to provide a flat prefabricated raft foundation and a construction method thereof, which can provide standardized prefabricated components, enhance structural strength, ensure assembly quality, and improve assembly speed.

[0004] To achieve the above object, the technical solution adopted by the present invention is: to provide a flat prefabricated raft foundation, including:

[0005] Four column-bottom plates, respectively supported under four column bodies arranged in a rectangle. In the column-bottom plates, there are first steel profiles extending horizontally to protrude from the opposite side walls of the column-bottom plates and second steel profiles extending longitudinally to protrude from the other opposite side walls of the column-bottom plates;

[0006] A number of column-intermediate plates, arranged in sequence along the horizontal or vertical direction between two adjacent column-bottom plates. In the column-intermediate plates, there are third steel profiles extending along their arrangement direction to protrude from the opposite side walls of the column-intermediate plates;

[0007] A number of mid-span plates, arranged in the rectangular space enclosed by the column-intermediate plates. In the mid-span plates, there are connecting steel bars extending longitudinally through. Two longitudinally arranged mid-span plates are connected by the connecting steel bars;

[0008] Among them, the first steel profile and the third steel profile, the second steel profile and the third steel profile, and between two adjacent third steel profiles are all connected by steel connection components. The longitudinally arranged steel connection components are connected by first steel bars extending longitudinally, and the horizontally arranged steel connection components are connected by second steel bars extending horizontally. Between the horizontally arranged mid-span plates and between the horizontally arranged column-intermediate plates and mid-span plates are respectively connected by mid-span connectors.

[0009] In a possible implementation, the steel connection assembly includes two symmetrically arranged clamping parts, an upper socket inserted into the upper part of the clamping part, and a lower socket inserted into the lower part of the clamping part. The two clamping parts are used to clamp on both sides of the first section steel, the second section steel or the third section steel, and the upper socket and the lower socket are respectively connected to the clamping part through a horizontally penetrating first connecting piece.

[0010] In some embodiments, the upper edge of the clamping part has an upper edge plate extending upward. The upper socket is buckled on the upper edge plate and has two downward extending lower insertion plates. The two lower insertion plates penetrate through the tops of the two clamping parts one by one and are attached to the outer sides of the middle parts of the two clamping parts. The first connecting piece penetrates through the lower insertion plate and is arranged with the clamping part;

[0011] The lower edge of the clamping part has a lower edge plate extending downward. The lower socket is buckled below the lower edge plate and has two upward extending upper insertion plates. The two upper insertion plates penetrate through the bottoms of the two clamping parts one by one and are attached to the outer sides of the middle parts of the two clamping parts. The first connecting piece penetrates through the upper insertion plate and is arranged with the clamping part;

[0012] There are two groups of first steel bars distributed in the up and down direction. The first steel bar located above penetrates through the upper socket and the upper edge plate of the longitudinally arranged steel connection assembly, and the first steel bar located below penetrates through the lower socket and the lower edge plate of the longitudinally arranged steel connection assembly;

[0013] There are two layers of second steel bars distributed in the up and down direction. The second steel bar located in the upper layer penetrates through the upper socket and the upper edge plate of the horizontally arranged steel connection assembly, and the second steel bar located in the lower layer penetrates through the lower socket and the lower edge plate of the horizontally arranged steel connection assembly.

[0014] In some embodiments, the width of the upper socket is equal to the width of the clamping part. The upper socket protrudes from the lower insertion plate to both sides. The upper socket is provided with an upper through groove opening downward for the first steel bar or the second steel bar to penetrate. The upper edge plate is penetrated with an upper slot hole corresponding to the upper through groove, and the upper through groove is located outside the lower insertion plate;

[0015] The width of the lower socket is equal to the width of the clamping part. The lower socket protrudes from the upper insertion plate to both sides. The lower socket is provided with a lower through groove opening upward for the first steel bar or the second steel bar to penetrate. The lower edge plate is penetrated with a lower slot hole corresponding to the lower through groove, and the lower through groove is located outside the upper insertion plate.

[0016] In a possible implementation, a transversely extending strengthening assembly is arranged inside the mid-span plate. The strengthening assembly includes two main channel steels with opposite openings and strengthening steel bars connected between the two main channel steels. The outer side wall of the web of the main channel steel is flush with the side wall of the mid-span plate.

[0017] In some embodiments, a first upper buckling channel steel penetrates through the upper flange of the main channel steel from top to bottom. Below the upper flange of the main channel steel, there is a first lower buckling channel steel which is arranged opposite to the opening of the first upper buckling channel steel and encloses the outside of the first upper buckling channel steel. The first upper buckling channel steel and the first lower buckling channel steel are connected by a second connecting member extending vertically;

[0018] A second lower buckling channel steel penetrates through the lower flange of the main channel steel from bottom to top. Above the lower flange of the main channel steel, there is a second upper buckling channel steel which is arranged opposite to the opening of the second lower buckling channel steel and encloses the outside of the second lower buckling channel steel. The second upper buckling channel steel and the second lower buckling channel steel are connected by a third connecting member extending vertically;

[0019] The reinforcing bars are distributed in two layers in the up and down direction. The reinforcing bars in the upper layer penetrate through the first upper buckling channel steel and the first lower buckling channel steel, and the ends of the reinforcing bars are bent and limited outside the first lower buckling channel steel; The reinforcing bars in the lower layer penetrate through the first upper buckling channel steel and the first lower buckling channel steel, and the ends of the reinforcing bars are bent and limited outside the second upper buckling channel steel.

[0020] In some embodiments, the mid-span connecting member includes:

[0021] Two fitting seats, which are respectively and correspondingly fitted and connected to the outsides of two main channel steels on the adjacent sides of two adjacent mid-span plates;

[0022] An outer sleeve, which is connected to the outside of one of the fitting seats through a first connecting plate. The plate surface of the first connecting plate extends in the up and down direction and is perpendicular to the outer wall of the fitting seat;

[0023] An inner sleeve, which is connected to the outside of the other fitting seat through a second connecting plate. The plate surface of the second connecting plate extends in the up and down direction and is perpendicular to the outer wall of the fitting seat;

[0024] Wherein, an avoidance groove is provided on the side wall of the outer sleeve and penetrates up and down to avoid the second connecting plate. The inner sleeve is inserted into the outer sleeve, and the inner sleeve is connected to the outer sleeve through a fourth connecting member extending horizontally.

[0025] In a possible implementation manner, the flat prefabricated raft foundation further includes a reinforcing plate located between the first section steel and the second section steel and used for supporting the column body. The top surface of the reinforcing plate is flush with the top surfaces of the first section steel and the second section steel. A steel bar mesh is provided on the top surfaces of the first section steel, the second section steel and the reinforcing plate. An avoidance hole for avoiding the column body is provided in the middle of the steel bar mesh. The steel bar mesh is disconnected at the avoidance hole to form bent steel bars that are bent upward and fitted and connected to the outer peripheral wall of the column body.

[0026] In a possible implementation manner, the connecting steel bars are distributed in two layers in the up and down direction, and each layer of connecting steel bars includes a plurality of connecting steel bars arranged at intervals transversely.

[0027] Compared with the prior art, the solution shown in the embodiments of the present application provides a flat prefabricated raft foundation. The column - under - plate, the column - between - plate, and the mid - span plate can be prefabricated in a factory. Subsequently, they are assembled through steel connection components, mid - span connection components, connecting steel bars, the first steel bars, and the second steel bars. Then, concrete is poured to form the integral raft foundation. The above - mentioned modules are convenient to assemble during the assembly process, making the structural stress more reasonable, improving the overall stability of the structure, and greatly enhancing the construction efficiency at the same time.

[0028] The present invention also provides a construction method for fabricating a flat prefabricated raft foundation, including the following steps:

[0029] Transport the column - under - plate, the column - between - plate, and the mid - span plate to the construction site and arrange them in the preset positions;

[0030] Align the first section steel of the column - under - plate with the third section steel of the horizontally arranged column - between - plate, and align the second section steel of the column - under - plate with the third section steel of the vertically arranged column - between - plate. Use the steel connection components to connect the first section steel and the third section steel, and the second section steel and the third section steel;

[0031] Use the mid - span connection components to connect two adjacent mid - span plates, and use the mid - span connection components to connect the horizontally arranged mid - span plates and the column - between - plates;

[0032] Pour concrete into the gaps between the column - under - plate and the column - between - plate, and the gaps between the mid - span plate and the column - between - plate to form the integral raft;

[0033] Install the column on the column - under - plate, connect the column and the column - under - plate, and pour concrete to cover the steel mesh and the reinforcement plate of the column - under - plate to form an outer - wrapped column foot.

[0034] Compared with the prior art, the construction method for fabricating a flat prefabricated raft foundation facilitates prefabrication of components in the factory and then on - site assembly and splicing. The components have a high degree of modularization and standardization, the overall structural stress is reasonable, the overall bearing capacity of the raft foundation is improved, the construction cost is reduced, the weight of the components is reduced, which is convenient for the transportation of prefabricated components, and has good bearing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the prior - art descriptions. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1Structural schematic diagram of the flat assembled raft foundation provided by the embodiment of the present invention;

[0037] Figure 2 For the embodiment of the present invention Figure 1 Structural schematic diagram of the lower plate of the middle column and the column body;

[0038] Figure 3 For the embodiment of the present invention Figure 1 Structural schematic diagram of the connection between two mid-span plates arranged horizontally;

[0039] Figure 4 For the embodiment of the present invention Figure 3 Partial enlarged structural schematic diagram of I;

[0040] Figure 5 For the embodiment of the present invention Figure 3 Structural schematic diagram of the strengthening component and the mid-span connecting piece;

[0041] Figure 6 For the embodiment of the present invention Figure 5 Structural schematic diagram of the strengthening component from another angle;

[0042] Figure 7 For the embodiment of the present invention Figure 1 Structural schematic diagram of two inter-column plates and the steel connection component;

[0043] Figure 8 For the embodiment of the present invention Figure 7 Partial enlarged structural schematic diagram.

[0044] Among them, the reference numerals in the figure are as follows:

[0045] 1. Lower plate of the column; 11. First section steel; 12. Second section steel; 13. Reinforcing plate; 14. Steel bar mesh; 15. Bent steel bar; 2. Inter-column plate; 21. Third section steel; 22. Connecting section steel; 3. Mid-span plate; 31. Connecting steel bar; 4. Steel connection component; 41. Clamping part; 411. Upper edge plate; 412. Lower edge plate; 413. Upper slot; 42. Upper buckle seat; 421. Lower inserting plate; 422. Upper through slot; 43. Lower buckle seat; 431. Upper inserting plate; 432. Lower through slot; 44. First connecting piece; 5. Column body; 6. Strengthening component; 61. Main channel steel; 62. Strengthening steel bar; 63. First upper buckle channel steel; 631. Upper hole; 641. Lower hole; 64. First lower buckle channel steel; 65. Second connecting piece; 66. Second lower buckle channel steel; 67. Second upper buckle channel steel; 68. Third connecting piece; 7. Mid-span connecting piece; 71. Fitting seat; 72. Outer sleeve; 721. First connecting plate; 722. Avoidance groove; 73. Inner sleeve; 731. Second connecting plate; 74. Fourth connecting piece; 8. First steel bar; 9. Second steel bar. Detailed implementation manners

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or several of such features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise specifically defined.

[0048] Please refer to Figure 1 , define the transverse and longitudinal directions of the flat prefabricated raft foundation, which form a right-angle angle with each other, corresponding to the length and width directions of the building respectively.

[0049] Please refer to Figures 1 to 8 together, and now the flat prefabricated raft foundation and construction method provided by the present invention will be described. The flat prefabricated raft foundation includes four column-bottom plates 1, several column-intermediate plates 2 and several mid-span plates 3. The four column-bottom plates 1 are respectively supported under four rectangularly arranged columns 5. The column-bottom plate 1 is provided with a first profiled steel 11 extending transversely to protrude from the opposite two side walls of the column-bottom plate 1 and a second profiled steel 12 extending longitudinally to protrude from the other opposite two side walls of the column-bottom plate 1; several column-intermediate plates 2 are sequentially arranged between two adjacent column-bottom plates 1 along the transverse or longitudinal direction. The column-intermediate plate 2 is provided with a third profiled steel 21 extending along its arrangement direction to protrude from the opposite two side walls of the column-intermediate plate 2; several mid-span plates 3 are arranged in the rectangular space surrounded by the column-intermediate plates 2. The mid-span plate 3 is provided with a connecting steel bar 31 extending longitudinally through it. Two longitudinally arranged mid-span plates 3 are connected by the connecting steel bar 31;

[0050] Among them, the first steel type 11 and the third steel type 21, the second steel type 12 and the third steel type 21, and between adjacent two third steel types 21 are respectively connected by steel connection components 4. The longitudinally arranged steel connection components 4 are connected by the first steel bars 8 extending longitudinally, and the transversely arranged steel connection components 4 are connected by the second steel bars 9 extending transversely. Between the transversely arranged middle-span plates 3 and between the transversely arranged column-intermediate plates 2 and middle-span plates 3 are respectively connected by middle-span connectors 7.

[0051] For the flat prefabricated raft foundation provided in this embodiment, compared with the prior art, for the flat prefabricated raft foundation provided in this embodiment, the column-bottom plates 1, column-intermediate plates 2 and middle-span plates 3 can be processed by factory prefabrication. Subsequently, they are assembled and connected through the steel connection components 4, middle-span connectors 7, connecting steel bars 31, the first steel bars 8 and the second steel bars 9. Then, concrete is poured to form the integral raft foundation. The above-mentioned modules are convenient to assemble during the assembly process, making the structure more reasonable in force, improving the overall stability of the structure, and also greatly improving the construction efficiency.

[0052] In this embodiment, the first steel type 11 in the column-bottom plate 1 extends transversely, and the second steel type 12 extends longitudinally. The transversely extending first steel type 11 can be connected to the third steel type 21 of the laterally adjacent column-intermediate plate 2 through the steel connection component 4, realizing the effective connection between the column-bottom plate 1 and the laterally arranged column-intermediate plate 2. Similarly, the longitudinally extending second steel type 12 can be connected to the third steel type 21 of the longitudinally adjacent column-intermediate plate 2 through the steel connection component 4, realizing the effective connection between the column-bottom plate 1 and the longitudinally arranged column-intermediate plate 2. The steel connection component 4 can bear large loads, and a small number of first connection pieces 44 can be used to complete the connection, and the connection is simple and easy to operate.

[0053] The number of column-intermediate plates 2 in the flat prefabricated raft foundation is not limited, and the overall size is adjusted by adjusting the number of column-intermediate plates 2. The middle-span plates 3 are located in the rectangular space formed by the column-bottom plates 1 and column-intermediate plates 2. The transversely arranged middle-span plates 3 are connected by middle-span connectors 7, and the laterally adjacent column-intermediate plates 2 and middle-span plates 3 are also connected by middle-span connectors 7.

[0054] Two longitudinally adjacent middle-span plates 3 are connected by the connecting steel bars 31 on their adjacent sides, realizing the longitudinal connection of the middle-span plates 3. On this basis, the connecting steel bars 31 are also provided on the column-intermediate plates 2 corresponding longitudinally to the middle-span plates 3 to realize the longitudinal connection between the longitudinally arranged middle-span plates 3 and column-intermediate plates 2.

[0055] The longitudinally extending first steel bar 8 can connect the steel connection components 4 arranged longitudinally, and the transversely extending second steel bar 9 can connect the steel connection components 4 arranged transversely. Combining the longitudinal connection function of the connecting steel bar 31 and the transverse connection function of the mid-span connector 7 can achieve reliable longitudinal and transverse two-way connection of the raft foundation, which is convenient for improving the overall mechanical properties of the structure and ensuring the overall stability of the foundation.

[0056] The first section steel 11, the second section steel 12 and the third section steel 21 are all embedded H-shaped steels. The first section steel 11 and the second section steel 12 in the column bottom plate 1 can be spliced in multiple sections. The column bottom plate 1, the column intermediate plate 2 and the mid-span plate 3 are all reinforced concrete components with the same size and high prefabrication rate, which are convenient for transportation and on-site installation.

[0057] In some possible implementation manners, the above-mentioned characteristic steel connection component 4 adopts the structure as shown in Figure 7 and Figure 8 . Referring to Figure 7 and Figure 8 , the steel connection component 4 includes two symmetrically arranged clamping parts 41, an upper buckle seat 42 inserted into the upper part of the clamping part 41, and a lower buckle seat 43 inserted into the lower part of the clamping part 41. The two clamping parts 41 are used to clamp the two sides of the first section steel 11, the second section steel 12 or the third section steel 21. The upper buckle seat 42 and the lower buckle seat 43 are respectively connected to the clamping part 41 through a horizontally penetrating first connecting piece 44.

[0058] The steel connection component 4 is used to connect the first section steel 11 and the third section steel 21 adjacent to it transversely, or to connect the second section steel 12 and the third section steel 21 adjacent to it longitudinally. It can also connect two transversely adjacent column intermediate plates 2 and two longitudinally adjacent column intermediate plates 2. For the convenience of description, taking the connection between the first section steel 11 and the third section steel 21 adjacent to it transversely as an example, the structure of the steel connection component 4 is described as follows.

[0059] In this embodiment, the two clamping portions 41 of the steel connection assembly 4 can be clamped on both sides of the adjacent ends of the first section steel 11 and the second section steel 12, and have a cross-sectional shape similar to that of the H-shaped steel. Grooves for the upper flange, lower flange and web of the first section steel 11 and the second section steel 12 to be inserted are provided on the adjacent sides of the two clamping portions 41. One of the clamping portions 41 is attached to one side of the adjacent ends of the first section steel 11 and the second section steel 12, and the other clamping portion 41 is attached to the other side of the adjacent ends of the first section steel 11 and the second section steel 12. The portion of the clamping portion 41 surrounding the upper flange of the section steel is defined as the top of the clamping portion 41, the portion of the clamping portion 41 surrounding the lower flange of the section steel is defined as the bottom of the clamping portion 41, and the portion of the clamping portion 41 surrounding the web of the section steel is defined as the middle of the clamping portion 41. The upper buckle seat 42 and the lower buckle seat 43 are respectively inserted into the clamping portion 41 from the upper and lower sides, penetrate through the upper flange and the lower flange of the first section steel 11 and the second section steel 12 respectively, and the upper buckle seat 42, the lower buckle seat 43, the clamping portion 41, the first section steel 11 and the second section steel 12 are reliably connected by the first connecting member 44.

[0060] Specifically, a plurality of the first section steels 11 can be arranged in parallel in the column bottom plate 1, and are correspondingly connected to the laterally adjacent third section steel 21 through a plurality of steel connection assemblies 4 to ensure the reliability of the connection between the column bottom plate 1 and the column intermediate plate 2. Similarly, the longitudinally adjacent second section steel 12 and the third section steel 21 are also connected by the steel connection assembly 4, and the two column intermediate plates 2 arranged adjacent laterally or longitudinally are also connected by the steel connection assembly 4. The steel connection assemblies 4 all adopt the above structure and will not be elaborated here.

[0061] In some embodiments, the above-mentioned characteristic steel connection assembly 4 can adopt structures such as Figure 1 、 Figure 7 and Figure 8 as shown. Referring to Figure 1 、 Figure 7 and Figure 8 , the upper edge of the clamping portion 41 has an upper edge plate 411 extending upward. The upper buckle seat 42 is buckled on the upper edge plate 411 and has two lower insertion plates 421 extending downward. The two lower insertion plates 421 penetrate through the tops of the two clamping portions 41 one by one and are attached to the outer sides of the middles of the two clamping portions 41. The first connecting member 44 penetrates through the lower insertion plates 421 and is arranged with the clamping portion 41;

[0062] The lower edge of the clamping portion 41 has a lower edge plate 412 extending downward. The lower buckle seat 43 is buckled below the lower edge plate 412 and has two upper insertion plates 431 extending upward. The two upper insertion plates 431 penetrate through the bottoms of the two clamping portions 41 one by one and are attached to the outer sides of the middles of the two clamping portions 41. The first connecting member 44 penetrates through the upper insertion plates 431 and is arranged with the clamping portion 41;

[0063] There are two groups of the first steel bars 8 distributed in the up-and-down direction. The first steel bars 8 located above penetrate through the upper buckle seat 42 and the upper edge plate 411 of the longitudinally arranged steel connection assembly 4, and the first steel bars 8 located below penetrate through the lower buckle seat 43 and the lower edge plate 412 of the longitudinally arranged steel connection assembly 4;

[0064] There are two layers of the second steel bars 9 distributed in the up-and-down direction. The second steel bars 9 located in the upper layer penetrate through the upper buckle seat 42 and the upper edge plate 411 of the horizontally arranged steel connection assembly 4, and the second steel bars 9 located in the lower layer penetrate through the lower buckle seat 43 and the lower edge plate 412 of the horizontally arranged steel connection assembly 4.

[0065] In this embodiment, an upper edge plate 411 is further provided on the upper edge of the clamping part 41, and a cavity for correspondingly accommodating the upper edge plate 411 is provided on the upper buckle seat 42, which can limit the two upper edge plates 411 of the two clamping parts 41. The above positions provide an installation space for the layout of the first steel bars 8, and the first steel bars 8 penetrate through the upper buckle seat 42 and the upper edge plate 411.

[0066] In some embodiments, the above-mentioned characteristic steel connection assembly 4 can adopt the structure as Figure 2 shown. Refer to Figure 2 , the width of the upper buckle seat 42 is equal to the width of the clamping part 41. The upper buckle seat 42 protrudes from the lower insertion plate 421 to both sides. An upper through groove 422 with an opening downward for the first steel bar 8 or the second steel bar 9 to penetrate is provided on the upper buckle seat 42. An upper slot hole 413 corresponding to the upper through groove 422 is penetrated on the upper edge plate 411, and the upper through groove 422 is located outside the lower insertion plate 421;

[0067] The width of the lower buckle seat 43 is equal to the width of the clamping part 41. The lower buckle seat 43 protrudes from the upper insertion plate 431 to both sides. A lower through groove 432 with an opening upward for the first steel bar 8 or the second steel bar 9 to penetrate is provided on the lower buckle seat 43. A lower slot hole corresponding to the lower through groove 432 is penetrated on the lower edge plate 412, and the lower through groove 432 is located outside the upper insertion plate 431.

[0068] The longitudinally arranged steel connection assemblies 4 are penetrated together by the first steel bars 8, and the horizontally arranged steel connection assemblies 4 are penetrated together by the second steel bars 9, forming a structural connection in different vertical and horizontal directions and improving the integrity of the flap foundation.

[0069] For the convenience of description, in this embodiment, the positional relationship between the longitudinally arranged steel connection assembly 4 and the first steel bar 8 is described. An upper slot hole 413 opening upward is provided on the upper edge plate 411, and an upper through slot 422 opening downward is provided at the position where the upper buckle seat 42 protrudes from the lower plug plate 421 on both sides. After being connected by the first connecting member 44, the upper slot hole 413 and the upper through slot 422 can enclose a space for accommodating the first steel bar 8, thereby locking the relative position of the steel connection assembly 4 and the first steel bar 8, and connecting the raft foundation in the transverse and longitudinal directions respectively, thereby improving the integrity of the raft foundation and enhancing its mechanical properties.

[0070] In some possible implementations, the above-mentioned characteristic cross-section plate 3 is adopted as follows Figure 6 and Figure 7 See the structure shown. Figure 6 and Figure 7 A transversely extending reinforcement component 6 is provided inside the mid-span plate 3. The reinforcement component 6 includes two main channel steels 61 with openings arranged opposite to each other and reinforcement steel bars 62 connected between the two main channel steels 61. The outer side wall of the web of the main channel steel 61 is flush with the side wall of the mid-span plate 3.

[0071] In this embodiment, a reinforcement component 6 is embedded inside the mid-span plate 3 to enhance its structural strength. Two symmetrically arranged channel steels are connected by reinforcing steel bars 62, and the load borne by the reinforcing steel bars 62 can be transferred to the main channel steel 61, making the structural force transmission system of the entire mid-span plate 3 more reasonable.

[0072] In some embodiments, the feature enhancement component 6 may be implemented as follows: Figure 6 See the structure shown. Figure 6 The upper flange of the main channel steel 61 is penetrated from top to bottom by a first upper buckle channel steel 63, and the lower upper flange of the main channel steel 61 is provided with a first lower buckle channel steel 64 which is arranged opposite to the opening of the first upper buckle channel steel 63 and enclosed on the outer side of the first upper buckle channel steel 63. The first upper buckle channel steel 63 and the first lower buckle channel steel 64 are connected by a second connecting piece 65 extending vertically;

[0073] A second lower buckle channel steel 66 is penetrated from bottom to top of the lower flange of the main channel steel 61, and a second upper buckle channel steel 67 is arranged above the lower flange of the main channel steel 61, which is arranged opposite to the opening of the second lower buckle channel steel 66 and enclosed outside the second lower opening channel steel. The second upper buckle channel steel 67 and the second lower buckle channel steel 66 are connected by a third connecting piece 68 extending vertically;

[0074] The reinforcing bars 62 are distributed in two layers in the up-and-down direction. The reinforcing bars 62 in the upper layer penetrate through the first upper buckling channel steel 63 and the first lower buckling channel steel 64, and the ends of the reinforcing bars 62 are bent and limited outside the first lower buckling channel steel 64; the reinforcing bars 62 in the lower layer penetrate through the first upper buckling channel steel 63 and the first lower buckling channel steel 64, and the ends of the reinforcing bars 62 are bent and limited outside the second upper buckling channel steel 67.

[0075] In this embodiment, a structure capable of forming a connection with the reinforcing bars 62 is provided on the main channel steel 61. For the convenience of description, the structure provided on the upper flange of the main channel steel 61 is taken as an example for illustration.

[0076] The first upper buckling channel steel 63 is vertically penetrated through the upper flange of the main channel steel 61 from top to bottom. The first upper buckling channel steel 63 is arranged with its opening facing downwards, and the upper flange and the lower flange of the first upper buckling channel steel 63 penetrate through the upper flange of the main channel steel 61.

[0077] The first lower buckling channel steel 64 is located below the upper flange of the main channel steel 61, is arranged opposite to the opening of the first upper buckling channel steel 63, and is wrapped outside the first upper buckling channel steel 63. The two are connected by a second connecting piece 65 extending vertically and can be reliably fixed on the upper flange of the main channel steel 61.

[0078] The ends of the reinforcing bars 62 extend below the upper flange of the main channel steel 61, penetrate through the first upper buckling channel steel 63 and the first lower buckling channel steel 64 and extend into the interior of the main channel steel 61. The ends of the reinforcing bars 62 are bent downwards so that they are attached to the side of the first lower buckling channel steel 64 adjacent to the web of the main channel steel 61, realizing the locking of the relative positions between the main channel steel 61 and the reinforcing bars 62.

[0079] The lower edge of the first upper buckling channel steel 63 is provided with an upper hole 631 with an opening facing downwards for the reinforcing bar 62 to pass through. The upper edge of the first lower buckling channel steel 64 is provided with a lower hole 641 with an opening facing upwards for the reinforcing bar 62 to pass through. After the connection is completed by using the second connecting piece 65, the upper hole 631 and the lower hole 641 coincide and form a space for the reinforcing bar 62 to pass through.

[0080] On this basis, the reinforcing bars 62 are distributed in two layers, the reinforcing bars 62 in the upper layer penetrate through the first upper buckling channel steel 63 and the first lower buckling channel steel 64, and the reinforcing bars 62 in the lower layer penetrate through the first upper buckling channel steel 63 and the first lower buckling channel steel 64. The specific structures are the same and will not be elaborated here.

[0081] In the above structure, when the reinforcing component 6 is installed and connected, the second connecting piece 65 adopts a bolt connection method. The above connection method will not generate welding residual stress and deformation, has high strength and reliable connection, and enhances the internal strength of the middle-span plate 3.

[0082] In some embodiments, the above-mentioned characteristic mid-span connector 7 can be adopted as follows Figures 3 to 5 See the structure shown. Figures 3 to 5 The mid-span connector 7 includes two fitting seats 71, an outer sleeve 72 and an inner sleeve 73. The two fitting seats 71 are respectively fitted and connected to the outer sides of the two main channel steels 61 on the adjacent sides of the two adjacent mid-span plates 3 in a one-to-one correspondence; the outer sleeve 72 is connected to the outer side of one of the fitting seats 71 through a first connecting plate 721, and the plate surface of the first connecting plate 721 extends in the up-down direction and is perpendicular to the outer wall of the fitting seat 71; the inner sleeve 73 is connected to the outer side of the other fitting seat 71 through a second connecting plate 731, and the plate surface of the second connecting plate 731 extends in the up-down direction and is perpendicular to the outer wall of the fitting seat 71;

[0083] The side wall of the outer sleeve 72 is provided with an escape groove 722 which passes through from top to bottom to avoid the second connecting plate 731 . The inner sleeve 73 is inserted into the outer sleeve 72 . The inner sleeve 73 is connected to the outer sleeve 72 via a fourth connecting member 74 extending horizontally.

[0084] In this embodiment, adjacent side walls of two adjacent mid-span plates 3 are respectively connected with fitting seats 71, and the fitting seats 71 are arranged on the outer wall of the main channel steel 61. The two fitting seats 71 are respectively connected with a first connecting plate 721 and a second connecting plate 731 extending toward adjacent sides. The outer sleeve 72 is connected to the outer edge of the first connecting plate 721, and the inner sleeve 73 is connected to the outer edge of the second connecting plate 731. The relative positions of the two mid-span plates 3 are limited by the plug-in fit between the inner sleeve 73 and the outer sleeve 72.

[0085] Specifically, the outer diameter of the inner sleeve 73 is consistent with the inner diameter of the outer sleeve 72, and the two have a certain clearance tolerance, which facilitates the connection and avoids the horizontal position displacement of the two. In order to avoid position interference between the two during the plug-in process, the outer sleeve 72 is provided with an escape groove 722 that runs through from top to bottom, allowing the second connecting plate 731 to penetrate from top to bottom, so that the inner sleeve 73 and the outer sleeve 72 can be plugged in.

[0086] On this basis, the laterally adjacent mid-span plates 3 and the inter-column plates 2 are also connected by the mid-span connectors 7, which is similar to the above structure and will not be repeated here. At this point, the connection between two laterally adjacent mid-span plates 3 or the laterally adjacent mid-span plates 3 and the inter-column plates 2 is completed to ensure the reliable connection of the raft foundation in the laterally direction.

[0087] In some possible implementations, the above-mentioned characteristic column lower plate 1 adopts the following Figure 1 and Figure 2 See the structure shown. Figure 1 and Figure 2, the flat prefabricated raft foundation further includes a reinforcing plate 13 located between the first section steel 11 and the second section steel 12 and used for supporting the column body 5. The top surface of the reinforcing plate 13 is flush with the top surfaces of the first section steel 11 and the second section steel 12. A steel bar mesh 14 is provided on the top surfaces of the first section steel 11, the second section steel 12, and the reinforcing plate 13. An avoidance hole for avoiding the column body 5 is provided in the middle of the steel bar mesh 14. The steel bar mesh 14 is disconnected at the avoidance groove 722 to form a bent steel bar 15 that bends upward and fits and connects to the outer peripheral wall of the column body 5.

[0088] In this embodiment, in the column bottom plate 1, there are a first section steel 11 and a second section steel 12 arranged perpendicular to each other. Specifically, there are three first section steels 11 and three second section steels 12 respectively. The first section steel 11 located in the middle of the transverse direction and the second section steel 12 located in the middle of the longitudinal direction intersect below the center of the column body 5. Four triangular reinforcing plates 13 are respectively provided at the four included angles at the intersection position of the first section steel 11 located in the middle of the transverse direction and the second section steel 12 located in the middle of the longitudinal direction. The top surface of the reinforcing plate 13 is flush with the top surfaces of the first section steel 11 and the second section steel 12. Bolt holes are provided on the reinforcing plate 13 for connecting with the foot (column foot) of the column body 5 to provide a flat supporting foundation for the column body 5.

[0089] On this basis, a steel bar mesh 14 is laid on the top surfaces of the first section steel 11, the second section steel 12, and the reinforcing plate 13. There is an avoidance hole in the middle position of the steel bar mesh 14 to provide an installation space for the column body 5. The bent steel bar 15 disconnected at the avoidance hole bends upward and fits on the peripheral walls of the column body 5 and is finally poured together with the column body 5. It should be noted that when the column bottom plate 1 is manufactured, concrete is not poured, and enough areas are reserved for connecting with the foot (i.e., column foot) of the column body 5, which improves the strength of the connection structure and enhances the bearing performance.

[0090] In some possible implementation manners, the above-mentioned connecting steel bars 31 adopt the structure as Figure 3 shown. Refer to Figure 3 , the connecting steel bars 31 are distributed in two layers in the up and down direction, and each layer of connecting steel bars 31 includes several connecting steel bars 31 arranged at intervals in the transverse direction.

[0091] In this embodiment, two adjacent mid-span plates 3 in the transverse direction, and the column-intermediate plates 2 and the mid-span plates 3 adjacent in the transverse direction are respectively connected by mid-span connectors 7. The column-intermediate plates 2 and the column bottom plates 1 adjacent in the transverse direction and two adjacent column-intermediate plates 2 in the transverse direction are respectively connected by steel connection components 4. The horizontally distributed steel connection components 4 are connected by the second steel bars 9. The combination of the above structures ensures the reliability of the horizontal connection of the raft foundation.

[0092] Two longitudinally adjacent mid-span plates 3, and between the longitudinally adjacent column-intermediate plates 2 and mid-span plates 3 are reliably connected by connecting steel bars 31. Between the longitudinally adjacent column-intermediate plates 2 and column-bottom plates 1, and between two longitudinally adjacent column-intermediate plates 2 are respectively connected by steel connection assemblies 4. The longitudinally distributed steel connection assemblies 4 are connected by first steel bars 8. The combination of the above structures ensures the reliability of the transverse connection of the raft foundation.

[0093] The connecting steel bars 31 are provided with two layers, which can form longitudinal connection effects at different height positions. At the same time, the longitudinally distributed steel connection assemblies 4 are connected by first steel bars 8, ensuring the reliability of the longitudinal connection. The above structure realizes the reliable connection of the raft foundation in the longitudinal and transverse directions and improves the structural stability.

[0094] Specifically, the two layers of connecting steel bars 31 can be within the height range of the main channel steel 61, and should be able to avoid the reinforcement bars 62 in height. They can also be arranged above or below the main channel steel 61, and the specific selection is made according to the actual situation of the structural dimensions.

[0095] On this basis, in order to facilitate the transverse extension of the raft foundation, connecting steel profiles 22 extending horizontally outwards are respectively arranged on the outer sides of the longitudinally arranged column-intermediate plates 2. The connecting steel profiles 22 are used to connect with the connecting steel profiles 22 of another raft foundation to realize the expansion of the transverse length and meet the effect of one-way extension. The above structure can form a one-way slab strip, which is convenient for bearing the main load.

[0096] Based on the same inventive concept, the embodiment of the present application also provides a construction method for manufacturing a flat prefabricated raft foundation, including the following steps:

[0097] Transport the column-bottom plates 1, column-intermediate plates 2, and mid-span plates 3 to the construction site and arrange them in the preset positions;

[0098] Align the first steel profile 11 of the column-bottom plate 1 with the third steel profile 21 of the horizontally arranged column-intermediate plates 2, and align the second steel profile 12 of the column-bottom plate 1 with the third steel profile 21 of the longitudinally arranged column-intermediate plates 2. Use the steel connection assemblies 4 to connect the first steel profile 11 and the third steel profile 21, and the second steel profile 12 and the third steel profile 21;

[0099] Use the mid-span connectors 7 to connect two adjacent mid-span plates 3, and use the mid-span connectors 7 to connect the horizontally arranged mid-span plates 3 and column-intermediate plates 2;

[0100] Pour concrete into the gaps between the column-bottom plates 1 and column-intermediate plates 2 and the gaps between the mid-span plates 3 and column-intermediate plates 2 to form the integral raft;

[0101] Install the column body 5 onto the column bottom plate 1, connect the column body 5 and the column bottom plate 1, and pour concrete to cover the steel mesh 14 and the reinforcement plate 13 of the column bottom plate 1 to form an external column footing.

[0102] Compared with the prior art, the construction method for fabricating the flat prefabricated raft foundation facilitates the prefabrication and processing of components in the factory and then the on-site assembly and splicing. The components have a high degree of modularization and standardization, the overall force of the structure is reasonable, the overall bearing capacity of the raft foundation is improved, the construction cost is reduced, the weight of the components is reduced, the transportation of the prefabricated components is facilitated, and it has good bearing performance.

[0103] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Flat prefabricated raft foundation, characterized in that, Including: Four under-column plates, respectively supported under four columns arranged in a rectangle. The under-column plates are provided with a first section steel extending horizontally to protrude from opposite side walls of the under-column plates and a second section steel extending longitudinally to protrude from the other opposite side walls of the under-column plates; A number of between-column plates, arranged in sequence horizontally or longitudinally between two adjacent under-column plates. The between-column plates are provided with a third section steel extending along the arrangement direction to protrude from opposite side walls of the between-column plates; A number of mid-span plates, arranged in a rectangular space enclosed by the between-column plates. The mid-span plates are provided with longitudinally extending connecting steel bars passing through. Two longitudinally arranged mid-span plates are connected by the connecting steel bars; Wherein, the first section steel and the third section steel, the second section steel and the third section steel, and between two adjacent third section steels are all connected by steel connection components. The longitudinally arranged steel connection components are connected by longitudinally extending first steel bars, and the horizontally arranged steel connection components are connected by horizontally extending second steel bars. Between the horizontally arranged mid-span plates and between the horizontally arranged between-column plates and the mid-span plates are respectively connected by mid-span connectors; The interior of the mid-span plates is provided with a horizontally extending strengthening component. The strengthening component includes two main channel steels with opposite openings and strengthening steel bars connected between the two main channel steels. The outer side walls of the webs of the main channel steels are flush with the side walls of the mid-span plates; The upper flange of the main channel steel is penetrated by a first upper snap channel steel from top to bottom. Below the upper flange of the main channel steel, there is a first lower snap channel steel arranged opposite to the opening of the first upper snap channel steel and enclosing the outside of the first upper snap channel steel. The first upper snap channel steel and the first lower snap channel steel are connected by a vertically extending second connecting piece; The lower flange of the main channel steel is penetrated by a second lower snap channel steel from bottom to top. Above the lower flange of the main channel steel, there is a second upper snap channel steel arranged opposite to the opening of the second lower snap channel steel and enclosing the outside of the second lower snap channel steel. The second upper snap channel steel and the second lower snap channel steel are connected by a vertically extending third connecting piece; The strengthening steel bars are distributed in two layers in the up-down direction. The strengthening steel bars in the upper layer pass through the first upper snap channel steel and the first lower snap channel steel, and the ends of the strengthening steel bars are bent and limited outside the first lower snap channel steel; The strengthening steel bars in the lower layer pass through the first upper snap channel steel and the first lower snap channel steel, and the ends of the strengthening steel bars are bent and limited outside the second upper snap channel steel.

2. The flat prefabricated raft foundation according to claim 1, characterized in that, The steel connection component includes two symmetrically arranged clamping parts, an upper snap seat inserted into the upper part of the clamping parts, and a lower snap seat inserted into the lower part of the clamping parts. The two clamping parts are used to clamp the two sides of the first section steel, the second section steel or the third section steel. The upper snap seat and the lower snap seat are respectively connected to the clamping parts by horizontally penetrating first connecting pieces.

3. The flat prefabricated raft foundation according to claim 2, characterized in that, The upper edge of the clamping part has an upper edge plate extending upward. The upper fastening seat is fastened to the upper edge plate and has two downward-extending lower insertion plates. The two lower insertion plates respectively penetrate through the tops of the two clamping parts and are attached to the outer sides of the middles of the two clamping parts. The first connecting piece penetrates through the lower insertion plates and the clamping parts; The lower edge of the clamping part has a lower edge plate extending downward. The lower fastening seat is fastened below the lower edge plate and has two upward-extending upper insertion plates. The two upper insertion plates respectively penetrate through the bottoms of the two clamping parts and are attached to the outer sides of the middles of the two clamping parts. The first connecting piece penetrates through the upper insertion plates and the clamping parts; There are two groups of the first steel bars distributed in the up-and-down direction. The first steel bars located above penetrate through the upper fastening seat and the upper edge plate of the longitudinally arranged steel connection assembly. The first steel bars located below penetrate through the lower fastening seat and the lower edge plate of the longitudinally arranged steel connection assembly; There are two layers of the second steel bars distributed in the up-and-down direction. The second steel bars located in the upper layer penetrate through the upper fastening seat and the upper edge plate of the transversely arranged steel connection assembly. The second steel bars located in the lower layer penetrate through the lower fastening seat and the lower edge plate of the transversely arranged steel connection assembly.

4. The flat-panel assembled raft foundation according to claim 3, wherein, The width of the upper fastening seat is equal to the width of the clamping part. The upper fastening seat protrudes from the lower insertion plates on both sides. The upper fastening seat is provided with an upward-opening upper through groove for the first steel bar or the second steel bar to penetrate through. The upper edge plate is provided with an upper slot hole corresponding to the upper through groove. The upper through groove is located outside the lower insertion plate; The width of the lower fastening seat is equal to the width of the clamping part. The lower fastening seat protrudes from the upper insertion plates on both sides. The lower fastening seat is provided with a downward-opening lower through groove for the first steel bar or the second steel bar to penetrate through. The lower edge plate is provided with a lower slot hole corresponding to the lower through groove. The lower through groove is located outside the upper insertion plate.

5. The flat-panel assembled raft foundation according to claim 1, wherein The mid-span connecting piece includes: Two fitting seats respectively and correspondingly attached and connected to the outer sides of two main channel steels on the adjacent sides of two adjacent mid-span plates; An outer sleeve connected to the outer side of one of the fitting seats through a first connecting plate. The plate surface of the first connecting plate extends in the up-and-down direction and is perpendicular to the outer wall of the fitting seat; An inner sleeve connected to the outer side of the other fitting seat through a second connecting plate. The plate surface of the second connecting plate extends in the up-and-down direction and is perpendicular to the outer wall of the fitting seat; Wherein, the side wall of the outer sleeve is provided with an avoidance groove that penetrates up and down to avoid the second connecting plate. The inner sleeve is inserted into the outer sleeve. The inner sleeve is connected to the outer sleeve through a horizontally extending fourth connecting piece.

6. The flat-panel assembled raft foundation according to any one of claims 1-4, characterized in that The flat prefabricated raft foundation further includes a reinforcing plate located between the first section steel and the second section steel and used for supporting the column body. The top surface of the reinforcing plate is flush with the top surfaces of the first section steel and the second section steel. A steel bar mesh is provided on the top surfaces of the first section steel, the second section steel, and the reinforcing plate. An avoidance hole for avoiding the column body is provided in the middle of the steel bar mesh. The steel bar mesh is disconnected at the avoidance hole to form bent steel bars that are bent upward and fit and connect to the outer peripheral wall of the column body.

7. The flat prefabricated raft foundation according to any one of claims 1-4, characterized in that The connecting steel bars are distributed in two layers in the vertical direction, and each layer of the connecting steel bars includes a plurality of connecting steel bars arranged at intervals in the horizontal direction.

8. The construction method for fabricating the flat-panel assembled raft foundation described in any one of claims 1-7, characterized in that, It includes the following steps: Transport the column bottom plate, the column intermediate plate, and the mid-span plate to the construction site and arrange them in the preset positions; Align the first section steel of the column bottom plate with the third section steel of the horizontally arranged column intermediate plate, and align the second section steel of the column bottom plate with the third section steel of the longitudinally arranged column intermediate plate. Use steel connection components to connect the first section steel and the third section steel, and the second section steel and the third section steel; Use mid-span connectors to connect two adjacent mid-span plates, and use mid-span connectors to connect the horizontally arranged mid-span plates and the column intermediate plates; Pour concrete into the gaps between the column bottom plate and the column intermediate plate and the gaps between the mid-span plate and the column intermediate plate to form an integral raft; Install the column body on the column bottom plate, connect the column body and the column bottom plate, and pour concrete to cover the steel bar mesh and the reinforcing plate of the column bottom plate to form an outer-wrapped column foot.

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