Prefabricated flat raft foundation and construction method

Abstract

The present invention discloses a prefabricated flat raft foundation and a construction method, specifically relating to the field of building construction technology. The raft foundation includes a prefabricated unit plate, the bottom of the prefabricated unit plate is provided with a padding protrusion, the padding protrusion is used to form a reserved space between the bottom of the prefabricated unit plate and the foundation surface, the prefabricated unit plate is also provided with a reserved through hole running through from top to bottom, a butt pipe is detachably installed on the reserved through hole, an exhaust connection pipe is provided on the butt pipe, and the exhaust connection pipe is used to connect an exhaust device. The present invention uses the padding protrusion to pad the prefabricated unit plate, and then cooperates with the exhaust device to perform exhaust treatment on the bottom area of the prefabricated unit plate, thereby increasing the filling speed and filling quality of the bottom area of the prefabricated unit plate with concrete, thereby fully ensuring the bonding strength between the prefabricated unit plate and the foundation surface, effectively avoiding the occurrence of voids, and improving the construction quality of the flat raft foundation.

Description

Technical Field

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

[0002] A raft foundation is a common building foundation, widely used in multi-story and high-rise buildings. It uses the entire ground floor, or part of it, as a large, continuous slab, resting directly on the foundation. This distributes the building's weight and reduces the pressure per unit area of the foundation. This foundation is particularly suitable for conditions with poor soil quality, low bearing capacity, or uneven foundations.

[0003] Among them, the flat raft foundation is one of the simplest forms. It is suitable for situations where the foundation conditions are good and the building load distribution is relatively uniform. The flat raft foundation is used directly as the subfloor. It usually has a uniform thickness and does not require special beams or column caps to strengthen it. Therefore, in some large buildings such as parks and exhibition halls, many underground or ground buildings need to use flat raft foundations to provide a larger plane space.

[0004] The construction of a flat raft foundation mainly requires foundation treatment, cushion laying, waterproofing layer construction, steel bar binding, formwork construction and concrete pouring. The overall construction period is relatively long, and it takes time to wait for the concrete to solidify. During this period, it is greatly affected by the weather. For projects with a shorter construction period, the construction time is tight. Therefore, some construction projects will also use prefabricated raft foundation structures. During the early foundation construction, the construction of prefabricated unit panels can be carried out in the factory (the overall cast-in-place raft foundation is divided into several small units). After the base construction is completed, the prefabricated unit panels are directly transported to the construction site for assembly, and then on-site concrete is poured at the splicing parts. Finally, the raft components are connected into a raft as a whole, thereby shortening the construction time. Since most of the prefabricated parts are already in a formed and solidified state, only the splicing parts are cast-in-place concrete that needs to wait for solidification. During this period, other construction can be carried out on the prefabricated unit panels, thereby further improving the efficiency of the project construction.

[0005] However, since a layer of concrete needs to be pre-sprayed on the foundation during foundation treatment, the prefabricated unit panels can be laid relatively smoothly for construction scenarios with a relatively high foundation flatness. However, for construction scenarios with a relatively low foundation flatness, gaps will appear at the bottom when laying the prefabricated unit panels. The gaps are relatively small, and when pouring the joints, it is relatively difficult for the concrete to enter the gaps, resulting in a large number of voids in the later stages, which will affect the actual construction quality. Summary of the Invention

[0006] The present invention provides a prefabricated flat raft foundation and construction method, which aims to solve the following problem: for existing construction scenarios with low foundation flatness, when laying prefabricated unit panels, gaps will appear at the bottom. The gaps are relatively small, and when pouring the splicing parts, it is relatively difficult for concrete to enter the gaps, resulting in a large number of voids in the later stage, which will affect the actual construction quality.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a prefabricated flat raft foundation, comprising a prefabricated unit plate, wherein the prefabricated unit plate is provided with docking pieces on all four sides, the docking pieces are used to dock and install two adjacent prefabricated unit plates, the prefabricated unit plate is further provided with reserved steel bars on all four sides, and a padding protrusion is provided on the bottom of the prefabricated unit plate, the padding protrusion is used to form a reserved space between the bottom of the prefabricated unit plate and the foundation surface;

[0008] The prefabricated unit board is also provided with a reserved through hole running through from top to bottom, and a butt pipe is detachably mounted on the reserved through hole, and an exhaust connection pipe is provided on the butt pipe. The exhaust connection pipe is used to connect to an exhaust device, and the exhaust device is used to form a negative pressure in the bottom area of the prefabricated unit board;

[0009] A vibration guide rope is provided at the bottom of the prefabricated unit panel, one end of which extends to the edge of the prefabricated unit panel, and the other end of which extends into the butt joint tube and passes through the top of the butt joint tube to form a vibration butt joint portion extending out of the butt joint tube. The vibration butt joint portion is used to be connected to the vibration equipment, and a closure is provided between the vibration guide rope and the top of the butt joint tube.

[0010] In a preferred embodiment, the vibration guide rope is an elastic structure, and the vibration guide rope is connected to the prefabricated unit plate through a traction plate at a position corresponding to the edge of the prefabricated unit plate. The traction plate is fixedly mounted on the prefabricated unit plate, and the vibration guide rope passes through the traction plate and is slidably connected to the traction plate. Multiple groups of guide rings are also arranged between the vibration guide rope and the prefabricated unit plate. The multiple groups of guide rings are evenly distributed in the length direction of the vibration guide rope, and the guide rings are fixedly mounted on the prefabricated unit plate.

[0011] In a preferred embodiment, the vibration equipment includes a driving roller and a squeezing roller, and a groove structure for accommodating the vibration docking part of the vibration guide rope is provided between the driving roller and the squeezing roller. When the vibration docking part of the vibration guide rope is inserted into the groove structure, the driving roller and the squeezing roller squeeze the vibration guide rope, and a detachable baffle ring is fixedly connected to one end of the vibration guide rope corresponding to the traction plate, and a reverse traction elastic member is provided between the detachable baffle ring and the traction plate.

[0012] In a preferred embodiment, the driving roller and the squeezing roller are both installed in a frame, a squeezing movable frame is slidably installed in the frame, the driving roller is rotatably installed in the frame and driven to rotate by a driving device, the squeezing roller is rotatably installed in the squeezing movable frame, and a movable regulator is provided between the squeezing movable frame and the frame, and the movable regulator is used to adjust the distance between the squeezing movable frame and the driving roller.

[0013] In a preferred embodiment, the air extraction device and the vibration device are both installed on a mobile vehicle, and the mobile vehicle is also provided with a lifting drive, and the vibration device is installed on the output end of the lifting drive.

[0014] In a preferred embodiment, the closure is a conical closure, a conical cavity is provided at the top of the butt-joint pipe, the conical closure is installed in the conical cavity, the vibration docking portion of each vibration guide rope passes through the conical closure, and the conical closure is composed of two semi-conical structures spliced together.

[0015] In a preferred embodiment, the closure is a piston-type closure, a piston cavity is provided at the top of the butt-jointed tube, and the piston-type closure can be detachably mounted on the outside of the vibration guide rope. The piston-type closure is two semi-cylindrical structures fixed and spliced by bolts and mounted on the outside of the vibration guide rope, and the piston-type closure is slidably mounted in the piston cavity.

[0016] In a preferred embodiment, a mounting hole is provided inside the prefabricated unit plate at a position corresponding to the raised protrusion, a rolling ball is provided at the bottom of the mounting hole, an extrusion column is provided at the top of the rolling ball, an embedded threaded sleeve is fixedly installed in the mounting hole, and the extrusion column is threadedly connected to the embedded threaded sleeve.

[0017] In a preferred embodiment, multiple groups of semi-cylinders are provided at the docking surface of the docking parts, and the semi-cylinders between the two groups of docking parts that are docked with each other are staggered. Expansion connection holes are provided on the docking parts, and the expansion connection holes of the corresponding two groups of docking parts are connected by locking bolts. The aperture of the expansion connection hole is larger than the diameter of the locking bolt, and extrusion plates are provided between both ends of the locking bolt and the docking parts.

[0018] A construction method for a prefabricated flat raft foundation comprises the following steps:

[0019] Step 1: hoist the prefabricated unit panels to the corresponding area, and butt-joint the butt joints between two adjacent sets of prefabricated unit panels. At the same time, tie and connect the reserved steel bars between the two adjacent sets of prefabricated unit panels.

[0020] Step 2: Use concrete pouring equipment to inject concrete into the joints around the prefabricated unit panels;

[0021] Step 3: Connect the exhaust device to the exhaust connection pipe, and use the exhaust device to extract air to form a negative pressure state in the bottom area of the prefabricated unit board;

[0022] Step 4: docking the vibration equipment with the vibration docking portion of the vibration guide rope, and driving the vibration guide rope to vibrate through the vibration equipment;

[0023] Step 5: After pouring is completed, pull out the vibration guide rope, remove the docking pipe, and wait for the poured concrete to solidify.

[0024] The beneficial effects of the present invention are as follows: the present invention raises the prefabricated unit plate by using the raising protrusions, and then performs exhaust treatment on the bottom area of the prefabricated unit plate in conjunction with the exhaust equipment, thereby increasing the filling speed and filling quality of the bottom area of the prefabricated unit plate with concrete, thereby fully ensuring the bonding strength between the prefabricated unit plate and the foundation surface, effectively avoiding the occurrence of voids, and improving the construction quality of the flat raft foundation. The vibration is transmitted to the vibration guide rope through the vibration equipment, thereby forming a vibration operation on the concrete at the bottom of the prefabricated unit plate during pouring, thereby improving the concrete filling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the prefabricated unit panel of the present invention.

[0026] Figure 2 This is a schematic diagram of the use status of the exhaust equipment of the present invention.

[0027] Figure 3 This is a schematic diagram of the vacuum state during the process of pouring concrete at the splicing parts after the prefabricated unit panels of the present invention are assembled.

[0028] Figure 4 This is a state diagram of the vibration device of the present invention vibrating and driving the vibration guide rope.

[0029] Figure 5 For the present invention Figure 4 A magnified view of the structure of part A.

[0030] Figure 6 This is a schematic structural diagram of the conical closure member used in the present invention.

[0031] Figure 7 Schematic diagram of the composition of the conical closure of the present invention.

[0032] Figure 8 This is a schematic structural diagram of the present invention when a piston-type sealing member is used.

[0033] Figure 9 This is a structural diagram of the present invention when a rolling ball structure is added to the raised protrusion.

[0034] Figure 10 This is a schematic structural diagram of the improved docking piece according to the present invention.

[0035] Figure 11 It is a flow chart of the construction method of the present invention.

[0036] The accompanying drawings are marked as follows: 1. Prefabricated unit plate; 11. Docking piece; 111. Semi-cylinder; 112. Expansion connection hole; 113. Extrusion plate; 114. Locking bolt; 12. Reserved steel bar; 13. Reserved through hole; 14. Raised protrusion; 15. Mounting hole; 2. Docking pipe; 21. Exhaust connection pipe; 22. Closing piece; 221. Conical closing piece; 222. Piston-type closing piece; 23. Conical cavity; 24. Piston cavity; 3. Exhaust equipment; 4. Vibration equipment; 41. Drive roller; 42. Extrusion roller; 43. Frame; 44. Extrusion movable frame; 5. Mobile vehicle; 51. Lifting drive; 6. Vibration guide rope; 61. Traction plate; 62. Guide ring; 63. Disengageable retaining ring; 64. Reverse traction elastic member; 7. Rolling ball; 71. Extrusion column; 72. Embedded threaded sleeve. DETAILED DESCRIPTION

[0037] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0038] Refer to the instruction manual Figures 1 to 10 , a prefabricated flat raft foundation, including a prefabricated unit panel 1, is provided with docking pieces 11 on all sides of the prefabricated unit panel 1. The docking pieces 11 are used for docking and installation between two adjacent prefabricated unit panels 1, such as using a flange structure and combining with bolts for installation. The prefabricated unit panel 1 itself is made of steel bars and concrete. Therefore, in order to enhance the connection strength between the two adjacent prefabricated unit panels 1, reserved steel bars 12 are reserved around the prefabricated unit panel 1. When assembling, each prefabricated unit panel 1 is hoisted to the corresponding position in turn, and after docking and connecting with the help of the docking pieces 11, the reserved steel bars 12 between the two adjacent prefabricated unit panels 1 are bundled. Finally, concrete can be poured into the assembly part formed between the two adjacent prefabricated unit panels 1. After the newly poured concrete solidifies, a complete flat raft foundation can be obtained, thereby saving the time for on-site tying of steel bars and pouring, and shortening the construction period.

[0039] In order to facilitate the pouring of the assembly parts so that the concrete can fully enter the bottom of the prefabricated unit panel 1, the bottom of the prefabricated unit panel 1 is provided with a raised protrusion 14, which is used to contact the surface of the construction foundation, so that a reserved space is formed between the bottom of the prefabricated unit panel 1 and the foundation surface to increase the size of the gap between the bottom of the prefabricated unit panel 1 and the foundation surface, making it easier for concrete to enter. At the same time, the prefabricated unit panel 1 is also provided with a reserved through hole 13 running through the top and bottom, and a docking pipe 2 is detachably installed on the reserved through hole 13. An exhaust connection pipe 21 is provided on the docking pipe 2, and the exhaust connection pipe 21 is used to connect the exhaust equipment 3. The exhaust equipment 3 can form a negative pressure state in the bottom area of the prefabricated unit panel 1 by continuously exhausting air.

[0040] It should be noted that the exhaust equipment 3 is a commonly used powerful exhaust equipment, such as a high-pressure exhaust pump structure, and the reserved through hole 13 can be installed in the reserved through hole 13 using a threaded insertion method. For example, a threaded docking structure is embedded in the reserved through hole 13, and during construction, the docking pipe 2 is threadedly inserted into the reserved through hole 13. In addition, the docking pipe 2 as a whole can also be directly embedded in the reserved through hole 13. After the construction is completed, the protruding part of the docking pipe 2 is cut off.

[0041] When pouring concrete around a prefabricated unit panel 1, the exhaust connection pipe 21 of the prefabricated unit panel 1 is connected to the exhaust device 3 through a pipeline, so that the bottom space of the prefabricated unit panel 1 forms a negative pressure state. Since concrete is poured around the prefabricated unit panel 1 at this time, the prefabricated unit panel 1 is relatively closed. Therefore, under the action of air pressure, refer to the attached manual. Figure 3 , which can accelerate the flow of concrete to the reserved through-hole 13, thereby accelerating the filling of the bottom area of the prefabricated unit plate 1 with concrete, until the concrete overflows into the butt-joint pipe 2 and fills the reserved through-hole 13. Then, the exhaust can be canceled, and the exhaust equipment 3 can be moved to another location for continued use, while the butt-joint pipe 2 on the prefabricated unit plate 1 is removed.

[0042] By using the raising protrusions 14 to raise the prefabricated unit panel 1, and then cooperating with the exhaust equipment 3 to exhaust the bottom area of the prefabricated unit panel 1, the filling speed and filling quality of the bottom area of the prefabricated unit panel 1 with concrete can be increased, thereby fully ensuring the bonding strength between the prefabricated unit panel 1 and the foundation surface, effectively avoiding the occurrence of voids, and improving the construction quality of the flat raft foundation.

[0043] Furthermore, for the splicing part of the prefabricated unit panel 1, since the space is relatively exposed, a vibrating rod can be used to vibrate the concrete directly during pouring to accelerate the exhaust of air and improve the filling degree of the concrete. However, since it is difficult to directly extend the vibrating rod into the bottom area of the prefabricated unit panel 1, there is still a possibility that air will remain in the concrete filling at the bottom of the prefabricated unit panel 1, forming small voids. Therefore, in order to further improve the pouring quality, this embodiment also provides the following technical solutions. For details, please refer to the attached specification. Figure 4 and Figure 5 A vibration guide rope 6 is provided at the bottom of the prefabricated unit panel 1, one end of the vibration guide rope 6 extends to the edge of the prefabricated unit panel 1, and the other end of the vibration guide rope 6 extends into the butt joint pipe 2 and passes through the top of the butt joint pipe 2 to form a vibration docking portion extending from the butt joint pipe 2, and the vibration docking portion is used to connect with the vibration equipment 4. At the same time, in order to ensure the exhaust effect of the exhaust equipment 3, a sealing member 22 is provided between the vibration guide rope 6 and the top of the butt joint pipe 2, and the sealing member 22 is used to provide a seal between the butt joint pipe 2 and the vibration guide rope 6 (a small gap is allowed to facilitate the activity or dismantling of the corresponding structure, and the exhaust equipment 3 can provide strong suction, so even if there is a small amount of leakage here, it will not affect the promotion effect of the concrete).

[0044] In the above embodiment, the vibration guide rope 6 can adopt a rigid structure, such as thin steel bars, and the thin steel bars are directly fixed on the prefabricated unit panel 1 through a fixing frame structure, and a gap is formed between the vibration guide rope 6 and the prefabricated unit panel 1, and the vibration equipment 4 can adopt a commonly used vibration structure, such as a vibration motor, a vibration rod, etc., which is brought into contact with the vibration docking part of the vibration guide rope 6 at the top of the docking pipe 2, so that the vibration can be transmitted to the vibration guide rope 6, thereby forming a vibration operation on the concrete at the bottom of the prefabricated unit panel 1 during pouring, thereby improving the concrete filling effect.

[0045] It should be noted that, in order to improve the vibration effect on the concrete at the bottom of the prefabricated unit panel 1, a plurality of vibration guide cables 6 are usually provided on the prefabricated unit panel 1. Based on the above-mentioned solution of the fixed vibration guide cables 6, the vibration guide cables 6 will eventually form a structure pre-buried in the bottom of the prefabricated unit panel 1, which will cause a certain amount of waste. In order to save construction costs and reduce material waste, the present embodiment also provides the following technical solutions. Specifically, the vibration guide cables 6 are elastic structures, such as steel cables, thin iron wires, plastic strips, etc., which can produce adaptive deformation structures. At the same time, the vibration guide cables 6 correspond to the prefabricated unit panel 1. The position at the edge is connected to the prefabricated unit panel 1 through the traction plate 61, and the traction plate 61 is fixedly installed on the prefabricated unit panel 1. The vibration guide rope 6 passes through the traction plate 61 and is slidably connected to the traction plate 61. A plurality of guide rings 62 are also provided between the vibration guide rope 6 and the prefabricated unit panel 1. The plurality of guide rings 62 are evenly distributed in the length direction of the vibration guide rope 6, and the guide rings 62 are fixedly installed on the prefabricated unit panel 1. Since the vibration guide rope 6 adopts a deformable elastic material, when use is finished, the vibration guide rope 6 can be pulled out from the outside by force to achieve the recovery of the vibration guide rope 6.

[0046] However, since the vibration guide rope 6 itself has elasticity, the vibration transmission effect of the traditional vibration equipment on the vibration guide rope 6 is poor. For this reason, the present embodiment also provides the following technical solutions. Specifically, the vibration equipment 4 includes a driving roller 41 and a squeezing roller 42. A groove structure for accommodating the vibration docking portion of the vibration guide rope 6 is provided between the driving roller 41 and the squeezing roller 42. When the vibration docking portion of the vibration guide rope 6 is inserted into the groove structure, the driving roller 41 and the squeezing roller 42 squeeze the vibration guide rope 6. One end of the vibration guide rope 6 corresponding to the traction plate 61 is fixedly connected with a detachable retaining ring 63, wherein the detachable retaining ring 63 is fixedly connected to the vibration guide rope 6 through a breakable weak connecting member (such as a plastic sheet), and a reverse traction elastic member 64 is provided between the detachable retaining ring 63 and the traction plate 61. In actual use, the driving roller 41 can be driven to rotate, thereby driving the vibration guide rope 6 to move, and since the vibration guide rope 6 itself can be bent and deformed, and the prefabricated unit plate 1 is provided with a retaining ring for guiding the vibration guide rope 6. The plurality of guide rings 62 are provided, so that although the vibration guide rope 6 has a curved portion, it can transmit movement, and the presence of the reverse traction elastic member 64 helps the driving roller 41 to pull the vibration guide rope 6 in the opposite direction when pressing the vibration docking portion of the vibration guide rope 6 downward, thereby cooperating with the micro-reciprocating rotation of the driving roller 41, a mobile vibration of the vibration guide rope 6 can be formed. When the construction is completed, the driving roller 41 is driven to rotate continuously, which can also form traction on the vibration guide rope 6, and then the vibration guide rope 6 is pulled out of the prefabricated unit board 1. At this time, the detachable retaining ring 63 can break when the vibration guide rope 6 is forced to be pulled, thereby detaching from the vibration guide rope 6, and the vibration guide rope 6 can be smoothly pulled out. Moreover, in the process of pulling out the vibration guide rope 6, it mainly moves along the bottom area of the prefabricated unit board 1, therefore, it has a driving effect on the concrete at the bottom of the prefabricated unit board 1, which can enhance the effect of concrete filling into the bottom center of the prefabricated unit board 1 and enhance the effect of exhausting excess air, further improving the construction quality.

[0047] In the above embodiment, the driving roller 41 and the squeezing roller 42 are both installed in the frame 43, and the squeezing movable frame 44 is slidably installed in the frame 43. The driving roller 41 is rotatably installed in the frame 43 and is driven to rotate by a driving device (such as a driving motor). The squeezing roller 42 is rotatably installed in the squeezing movable frame 44. A movable adjuster, such as a threaded rod structure, is provided between the squeezing movable frame 44 and the frame 43. By rotating the threaded rod, the distance between the squeezing movable frame 44 and the driving roller 41 can be adjusted, and the squeezing force between the squeezing roller 42 and the driving roller 41 on the vibrating guide rope 6 can be adjusted, thereby improving the traction effect.

[0048] Furthermore, in this embodiment, in order to facilitate construction, the exhaust equipment 3 and the vibration equipment 4 are both installed on a mobile vehicle 5 (such as a trolley), and a lifting drive 51 is also provided on the mobile vehicle 5. The vibration equipment 4 is installed on the output end of the lifting drive 51. The lifting drive 51 is a commonly used lifting and hoisting structure (such as a combination of a vertical guide rail and a hydraulic cylinder), so as to facilitate the movement of the vibration equipment 4 and the exhaust equipment 3. By controlling the lifting and lowering of the vibration equipment 4, it is more convenient to connect and cooperate with the vibration guide rope 6, thereby improving the convenience of equipment use.

[0049] This embodiment provides a solution for a sealing member 22. Figure 6 and Figure 7 , that is, the closure 22 is a conical closure 221, and a conical cavity 23 is provided on the top of the butt-joint pipe 2. The conical closure 221 is installed in the conical cavity 23. The vibration docking portion of each vibration guide 6 passes through the conical closure 221. The conical closure 221 is preferably a rubber structure. The conical closure 221 is spliced together by two semi-conical structures. A hole is provided between the two for the vibration guide 6 to pass through. In actual use, the air extraction device 3 forms a negative pressure in the butt-joint pipe 2, thereby also forming adsorption on the conical closure 221. In the process of downward extrusion, the conical closure 221 is affected by the conical cavity 23. Influence, the combination of the two is tighter and not easy to separate, and the vibration drive of the vibration guide rope 6 by the driving roller 41 is a micro-drive. Therefore, the conical closure 221 can adapt to the movement of the vibration guide rope 6 by generating self-deformation. In addition, if the vibration guide rope 6 needs to move over a long distance, the vibration guide rope 6 and the conical closure 221 can also slide, which does not affect the negative pressure state in the docking pipe 2. When the vibration guide rope 6 needs to be pulled out at the end of construction, the vibration guide rope 6 can be directly pulled up to separate the conical closure 221 from the conical cavity 23, so that the two semi-conical structures can be separated to separate from the vibration guide rope 6.

[0050] In addition, this embodiment also provides another solution of the sealing member 22, see the attached specification. Figure 8 , that is, the closure 22 is a piston-type closure 222, and a piston cavity 24 is provided at the top of the butt-joint pipe 2. The piston-type closure 222 can be detachably mounted on the outside of the vibration guide rope 6. For example, the piston-type closure 222 can be set as two semi-cylindrical structures, which are fixed and spliced on the outside of the vibration guide rope 6 by bolts, and the piston-type closure 222 is slidably mounted in the piston cavity 24 to form a piston structure, so that when the vibration guide rope 6 is driven to move by the vibration device 4, the piston-type closure 222 can also be continuously reciprocated in the piston cavity 24, thereby causing the negative pressure strength of the butt-joint pipe 2 and the bottom of the prefabricated unit plate 1 to fluctuate, so as to cause the flow of concrete to fluctuate, facilitate the filling of concrete, and improve the effect of air separation.

[0051] Refer to the instruction manual Figure 9 and Figure 10 In order to facilitate the docking connection of the prefabricated unit panels 1, the present embodiment further provides the following technical solutions. Specifically, a mounting hole 15 is provided at the position of the raised protrusion 14 inside the prefabricated unit panel 1. A rolling ball 7 is provided at the bottom of the mounting hole 15. An extrusion column 71 is provided on the top of the rolling ball 7. A pre-buried threaded sleeve 72 is fixedly installed in the mounting hole 15. The extrusion column 71 is threadedly connected to the pre-buried threaded sleeve 72. Then, with the help of the extrusion column 71, the rolling ball 7 is squeezed. In the process of actually assembling the prefabricated unit panel 1, the rolling ball 7 protrudes from the bottom of the raised protrusion 14, thereby forming a rolling support, so as to facilitate the positioning of the prefabricated unit panel 1. The position can be adjusted in detail to make the docking of the docking piece 11 more accurate. After the prefabricated unit panel 1 is moved to the specified position, the extrusion column 71 can be rotated to make the extrusion column 71 rise in the prefabricated unit panel 1, so that the raised protrusion 14 is in contact with the foundation surface and fixed. In addition, when pouring concrete, the extrusion column 71 and the ball 7 can be directly removed, and then concrete is poured into the mounting hole 15. In addition, when encountering an uneven foundation surface, the extrusion column 71 can be directly rotated to adjust the support height of the prefabricated unit panel 1 to adjust the position of the prefabricated unit panel 1, and the extrusion column 71 can be removed after the concrete solidifies.

[0052] Furthermore, if the docking member 11 only adopts the traditional flange structure for docking, although the structure is simple, it needs to be adjusted repeatedly during docking. Therefore, in order to improve the convenience of docking, the present embodiment improves the transmission flange-type docking member 11. Specifically, a plurality of groups of semi-cylinders 111 are provided at the docking surface of the docking member 11. The semi-cylinders 111 between the two groups of docking members 11 docked with each other are staggered, that is, the semi-cylinders 111 of one group correspond to the gap between the two adjacent semi-cylinders 111 of the other group, and an expansion connection hole 112 is provided on the docking member 11. The expansion connection holes 112 of the corresponding two groups of docking members 11 are connected by locking bolts 114. The expansion connection holes 112 The hole diameter is larger than the diameter of the locking bolt 114, and an extrusion plate 113 is provided between both ends of the locking bolt 114 and the docking piece 11, and the extrusion plate 113 covers the expansion connection hole 112. That is, when assembling the prefabricated unit plate 1, the prefabricated unit plate 1 can be controlled to reach the approximate area first, and then the locking bolt 114 is passed through the expansion connection hole 112 of the corresponding two sets of docking pieces 11, and the two sets of extrusion plates 113 are installed in the corresponding positions on the two sets of docking pieces 11, and then the locking bolts 114 are continuously tightened, and the two sets of docking pieces 11 are tightened by means of the extrusion plate 113. During the process, the corresponding two sets of semi-cylinders 111 begin to contact and adapt to each other, thereby automatically finding the right position and improving the matching efficiency.

[0053] Refer to the instruction manual Figure 11 The present invention also provides a prefabricated flat raft foundation construction method, comprising the following steps:

[0054] Step 1: hoist the prefabricated unit panels 1 to the corresponding area, and butt-jointly install the butt joints 11 between two adjacent groups of prefabricated unit panels 1. At the same time, tie and connect the reserved steel bars 12 between the two adjacent groups of prefabricated unit panels 1.

[0055] Step 2: Use concrete pouring equipment to inject concrete into the joints around the prefabricated unit panels 1;

[0056] Step 3: Connect the exhaust device 3 to the exhaust connection pipe 21, and exhaust air through the exhaust device 3 to form a negative pressure state in the bottom area of the precast unit panel 1, thereby accelerating the flow of concrete to the bottom area of the precast unit panel 1;

[0057] Step 4: dock the vibration device 4 with the vibration docking portion of the vibration guide rope 6, and drive the vibration guide rope 6 to vibrate through the vibration device 4;

[0058] Step 5: After pouring is completed, the vibration guide rope 6 is pulled out, and then the butt joint pipe 2 is removed, and the poured concrete is waited for to solidify.

[0059] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A prefabricated flat raft foundation, comprising a prefabricated unit plate (1), wherein the prefabricated unit plate (1) is provided with docking members (11) on all four sides, wherein the docking members (11) are used to dock and install two adjacent prefabricated unit plates (1), and the prefabricated unit plate (1) is further provided with reserved steel bars (12) on all four sides, characterized in that: The bottom of the prefabricated unit plate (1) is provided with a padding protrusion (14), and the padding protrusion (14) is used to form a reserved space between the bottom of the prefabricated unit plate (1) and the foundation surface; The prefabricated unit plate (1) is further provided with a reserved through hole (13) extending vertically therethrough, a butt joint (2) being detachably mounted on the reserved through hole (13), an exhaust connection pipe (21) being provided on the butt joint pipe (2), the exhaust connection pipe (21) being used to connect to an exhaust device (3), the exhaust device (3) being used to form a negative pressure in the bottom area of the prefabricated unit plate (1); A vibration guide rope (6) is provided at the bottom of the prefabricated unit plate (1), one end of the vibration guide rope (6) extends to the edge of the prefabricated unit plate (1), and the other end of the vibration guide rope (6) extends into the butt joint pipe (2) and passes through the top of the butt joint pipe (2), forming a vibration butt joint portion extending from the butt joint pipe (2), and the vibration butt joint portion is used to connect with the vibration equipment (4), and a closing member (22) is provided between the vibration guide rope (6) and the top of the butt joint pipe (2); Vibration guide ropes (6) in multiple directions are provided on the prefabricated unit plate (1), the vibration guide ropes (6) are elastic structures, the vibration guide ropes (6) are connected to the prefabricated unit plate (1) via traction plates (61) at positions corresponding to the edges of the prefabricated unit plate (1), the traction plates (61) are fixedly mounted on the prefabricated unit plate (1), the vibration guide ropes (6) pass through the traction plates (61) and are slidably connected to the traction plates (61), and multiple groups of guide rings (62) are further provided between the vibration guide ropes (6) and the prefabricated unit plate (1), the multiple groups of guide rings (62) are evenly distributed in the length direction of the vibration guide ropes (6), and the guide rings (62) are fixedly mounted on the prefabricated unit plate (1); The vibration device (4) comprises a driving roller (41) and a squeezing roller (42), wherein a groove structure for accommodating a vibrating docking portion of a vibrating guide rope (6) is provided between the driving roller (41) and the squeezing roller (42), and when the vibrating docking portion of the vibrating guide rope (6) is inserted into the groove structure, the driving roller (41) and the squeezing roller (42) squeeze the vibrating guide rope (6), and a detachable retaining ring (63) is fixedly connected to one end of the vibrating guide rope (6) corresponding to the traction plate (61), and a reverse traction elastic member (64) is provided between the detachable retaining ring (63) and the traction plate (61).

2. The prefabricated flat raft foundation according to claim 1, characterized in that: The driving roller (41) and the squeezing roller (42) are both mounted in a frame (43); a squeezing movable frame (44) is slidably mounted in the frame (43); the driving roller (41) is rotatably mounted in the frame (43) and driven to rotate by a driving device; the squeezing roller (42) is rotatably mounted in the squeezing movable frame (44); a movable regulator is provided between the squeezing movable frame (44) and the frame (43); and the movable regulator is used to adjust the distance between the squeezing movable frame (44) and the driving roller (41).

3. The prefabricated flat raft foundation according to claim 2, characterized in that: The air extraction device (3) and the vibration device (4) are both installed on a mobile vehicle (5). A lifting drive (51) is also provided on the mobile vehicle (5). The vibration device (4) is installed on the output end of the lifting drive (51).

4. The prefabricated flat raft foundation according to claim 3, characterized in that: The closure member (22) is a conical closure member (221), a conical cavity (23) is provided at the top of the butt-joint pipe (2), the conical closure member (221) is installed in the conical cavity (23), the vibration butt-joint portion of each vibration guide rope (6) passes through the conical closure member (221), and the conical closure member (221) is formed by splicing two semi-conical structures.

5. The prefabricated flat raft foundation according to claim 3, characterized in that: The closure (22) is a piston-type closure (222). A piston cavity (24) is provided on the top of the butt-joint tube (2). The piston-type closure (222) is detachably mounted on the outside of the vibration guide rope (6). The piston-type closure (222) is composed of two semi-cylindrical structures fixedly spliced and mounted on the outside of the vibration guide rope (6) by bolts, and the piston-type closure (222) is slidably mounted in the piston cavity (24).

6. The prefabricated flat raft foundation according to claim 4 or 5, characterized in that: A mounting hole (15) is provided inside the prefabricated unit plate (1) at a position corresponding to the raised protrusion (14); a rolling ball (7) is provided at the bottom of the mounting hole (15); an extrusion column (71) is provided at the top of the rolling ball (7); a pre-embedded threaded sleeve (72) is fixedly installed in the mounting hole (15); and the extrusion column (71) is threadedly connected to the pre-embedded threaded sleeve (72).

7. The prefabricated flat raft foundation according to claim 6, characterized in that: A plurality of groups of semi-cylinders (111) are provided at the docking surface of the docking member (11), and the semi-cylinders (111) between the two groups of docking members (11) that are docked with each other are arranged in a staggered manner. The docking member (11) is provided with an expansion connection hole (112), and the expansion connection holes (112) of the corresponding two groups of docking members (11) are connected by a locking bolt (114). The hole diameter of the expansion connection hole (112) is larger than the diameter of the locking bolt (114), and an extrusion plate (113) is provided between both ends of the locking bolt (114) and the docking member (11).

8. A construction method for a prefabricated flat raft foundation according to claim 7, characterized in that: The following steps are involved: Step 1: hoist the prefabricated unit panels (1) to the corresponding area, and butt-jointly install the butt joints (11) between two adjacent groups of prefabricated unit panels (1), and at the same time, tie and connect the reserved steel bars (12) between the two adjacent groups of prefabricated unit panels (1); Step 2: inject concrete into the joints around the prefabricated unit panels (1) using concrete pouring equipment; Step 3: Connect the exhaust device (3) to the exhaust connection pipe (21), and exhaust air through the exhaust device (3) to form a negative pressure state in the bottom area of the prefabricated unit board (1); Step 4: docking the vibration device (4) with the vibration docking portion of the vibration guide rope (6), and driving the vibration guide rope (6) to vibrate through the vibration device (4); Step 5: After pouring is completed, the vibrating guide rope (6) is pulled out, and then the butt joint (2) is removed, and the poured concrete is allowed to solidify.

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