Prefabricated flat plate type raft foundation and construction method

Abstract

The invention discloses a prefabricated flat plate type raft foundation and a construction method, and particularly relates to the technical field of building construction.The raft foundation comprises prefabricated unit plates, heightening protrusions are arranged at the bottoms of the prefabricated unit plates, and the heightening protrusions are used for forming reserved spaces between the bottoms of the prefabricated unit plates and the surface of a foundation; the prefabricated unit plates are further provided with reserved through holes penetrating up and down, butt joint pipes are detachably installed on the reserved through holes, and air exhaust connecting pipes are arranged on the butt joint pipes and used for being connected with air exhaust equipment. According to the method, the prefabricated unit plates are cushioned by using the heightening protrusions, and then the bottom areas of the prefabricated unit plates are subjected to air exhaust treatment in cooperation with the air exhaust equipment, so that the filling speed and filling quality of concrete to the bottom areas of the prefabricated unit plates can be increased, and then the bonding strength of the prefabricated unit plates and the surface of a foundation is fully guaranteed; the occurrence of a cavity phenomenon is effectively avoided, and the construction quality of the flat plate type raft foundation is improved.

Description

Technical Field

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

[0002] Raft foundation is a common building foundation form, widely used in multi-storey and high-rise buildings. It disperses the weight of the building and reduces the pressure per unit area of ​​the foundation by placing the entire bottom floor or part of the bottom floor structure of the building as a large continuous slab directly on the foundation. This foundation form is particularly suitable for foundation conditions with poor soil conditions, low bearing capacity or uneven foundation conditions.

[0003] Among them, the flat raft foundation is one of the simplest forms, which 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, usually with uniform thickness, and does not require special beams or column caps for reinforcement. 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 ground treatment, cushion laying, waterproofing 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. Moreover, 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 engineering 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 higher foundation flatness. However, for construction scenarios with a lower foundation flatness, gaps will appear at the bottom when the prefabricated unit panels are laid. The gaps are relatively small, and it is relatively difficult for concrete to enter the gaps when pouring the joints. This will result in a large number of voids in the later stages, which will affect the actual construction quality. Summary of the invention

[0006] A prefabricated flat raft foundation and construction method provided by the present invention 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, and the gaps are relatively small. 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 solutions: a prefabricated flat raft foundation, comprising a prefabricated unit plate, the prefabricated unit plate is provided with docking pieces around it, the docking pieces are used to dock and install two adjacent prefabricated unit plates, the prefabricated unit plate is also provided with reserved steel bars around it, and 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 board is also provided with a reserved through hole running through from top to bottom, and a butt pipe is detachably installed on the reserved through hole, and an exhaust connection pipe is provided on the butt pipe, and the exhaust connection pipe is used to connect an exhaust device, and the exhaust device is used to form a negative pressure in the bottom area of ​​the prefabricated unit board; A vibration guide rope is arranged 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 arranged between the vibration guide rope and the top of the butt joint tube.

[0008] In a preferred embodiment, the vibration guide rope is an elastic structure, and the vibration guide rope is connected to the prefabricated unit board through a traction plate at a position corresponding to the edge of the prefabricated unit board, and the traction plate is fixedly mounted on the prefabricated unit board. The vibration guide rope passes through the traction plate and is slidably connected to the traction plate. A plurality of guide rings are also arranged between the vibration guide rope and the prefabricated unit board, and the plurality 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 board.

[0009] 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 arranged 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 arranged between the detachable baffle ring and the traction plate.

[0010] 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.

[0011] In a preferred embodiment, the air extraction device and the vibration device are both installed on a moving vehicle, a lifting drive is also provided on the moving vehicle, and the vibration device is installed on the output end of the lifting drive.

[0012] In a preferred embodiment, the closure is a conical closure, a conical cavity is provided at the top of the butt-joint tube, 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 formed by splicing two semi-conical structures.

[0013] In a preferred embodiment, the closure is a piston-type closure, a piston cavity is provided at the top of the butt-jointed tube, the piston-type closure is 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.

[0014] 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.

[0015] 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 connecting holes are provided on the docking parts, and the expansion connecting holes of the corresponding two groups of docking parts are connected by locking bolts. The hole diameter of the expansion connecting 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.

[0016] A construction method for a prefabricated flat raft foundation comprises the following steps: Step 1: hoist the prefabricated unit panels to the corresponding area, and butt-jointly install the butt joints between two adjacent groups of prefabricated unit panels, and at the same time, tie and connect the reserved steel bars between the two adjacent groups of prefabricated unit panels; Step 2: inject concrete into the joints around the prefabricated unit panels using concrete pouring equipment; Step 3: Connect the exhaust device to the exhaust connection pipe, and exhaust air through the exhaust device to form a negative pressure state in the bottom area of ​​the prefabricated unit board; Step 4: docking the vibration device with the vibration docking portion of the vibration guide rope, and driving the vibration guide rope to vibrate through the vibration device; Step 5: After pouring is completed, pull out the vibration guide rope, remove the docking pipe, and wait for the poured concrete to solidify.

[0017] 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 cooperates with the exhaust equipment to exhaust 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. The vibration is transmitted to the vibration guide rope through the vibration equipment, so that during pouring, the concrete at the bottom of the prefabricated unit plate is vibrated to improve the concrete filling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the prefabricated unit panel of the present invention.

[0019] Figure 2 It is a schematic diagram of the use status of the air extraction device of the present invention.

[0020] Figure 3 It is a schematic diagram of the vacuuming state during the process of pouring concrete at the splicing parts after the prefabricated unit panels of the present invention are assembled.

[0021] Figure 4 This is a state diagram of the vibration device of the present invention vibrating and driving the vibration guide rope.

[0022] Figure 5 For the present invention Figure 4 A-section structure enlarged view.

[0023] Figure 6 This is a schematic diagram of the structure of the conical closure member used in the present invention.

[0024] Figure 7 It is a schematic diagram of the composition of the conical closure of the present invention.

[0025] Figure 8 This is a schematic diagram of the structure when the present invention adopts a piston-type sealing member.

[0026] Fig. 9 It is a schematic structural diagram of the present invention when a rolling ball structure is added to the raised protrusion.

[0027] Fig.10 The figure is a schematic diagram of the structure of the improved docking piece according to the present invention.

[0028] Fig.11 It is a flow chart of the construction method of the present invention.

[0029] 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. installation hole; 2. docking tube; 21. exhaust connection pipe; 22. closure; 221. conical closure; 222. piston closure; 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. detachable retaining ring; 64. reverse traction elastic member; 7. rolling ball; 71. extrusion column; 72. embedded threaded sleeve. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here 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. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0031] Refer to the instruction manual Figures 1 to 10 A prefabricated flat raft foundation comprises a prefabricated unit plate 1. The prefabricated unit plate 1 is provided with docking pieces 11 around it. The docking pieces 11 are used for docking and installation between two adjacent prefabricated unit plates 1. For example, a flange structure is used and bolts are used for combined installation. The prefabricated unit plate 1 itself is made of steel bars and concrete. Therefore, in order to enhance the connection strength between two adjacent prefabricated unit plates 1, reserved steel bars 12 are reserved around the prefabricated unit plates 1. When assembling, each prefabricated unit plate 1 is hoisted to a corresponding position in turn. After docking and connecting with the help of the docking pieces 11, the reserved steel bars 12 between the two adjacent prefabricated unit plates 1 are bundled. Finally, concrete can be poured into the assembly position formed between the two adjacent prefabricated unit plates 1. After the newly poured concrete solidifies, a complete flat raft foundation can be obtained, thereby saving the time for on-site steel bar tying and pouring, and shortening the construction period.

[0032] In order to facilitate the pouring of the assembly parts, the concrete can fully enter the bottom of the prefabricated unit panel 1, and 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, so as to increase the size of the gap between the bottom of the prefabricated unit panel 1 and the foundation surface, so that the concrete can enter more easily. At the same time, the prefabricated unit panel 1 is also provided with a reserved through hole 13 running through from top to bottom, and a docking pipe 2 is detachably installed on the reserved through hole 13, and an exhaust connection pipe 21 is provided on the docking pipe 2. The exhaust connection pipe 21 is used to connect the exhaust device 3, and the exhaust device 3 can form a negative pressure state in the bottom area of ​​the prefabricated unit panel 1 by continuously exhausting air.

[0033] It should be noted that the vacuum equipment 3 is a commonly used powerful vacuum equipment, such as a high-pressure vacuum pump structure, and the reserved through hole 13 can be installed in the reserved through hole 13 by means of threaded insertion. 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, and after the construction is completed, the protruding part of the docking pipe 2 can be cut off.

[0034] When pouring concrete around a prefabricated unit panel 1, the air extraction connection pipe 21 of the prefabricated unit panel 1 is connected to the air extraction 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 around. 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 panel 1 with concrete, until the concrete overflows into the butt joint pipe 2 and fills the reserved through hole 13. Then, the air extraction can be cancelled, and the air extraction device 3 can be moved to another location for continued use, and the butt joint pipe 2 on the prefabricated unit panel 1 can be removed.

[0035] By using the raising protrusions 14 to raise the prefabricated unit panel 1, and then using the exhaust equipment 3 to exhaust the bottom area of ​​the prefabricated unit panel 1, the filling speed and 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.

[0036] 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 the pouring of concrete 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, air may still 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, the present embodiment also provides the following technical solutions, which are specifically referred to in 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 docking tube 2 and passes through the top of the docking tube 2 to form a vibration docking portion extending from the docking tube 2, and the vibration docking portion is used to connect with the vibration device 4. At the same time, in order to ensure the exhaust effect of the exhaust device 3, a sealing member 22 is provided between the vibration guide rope 6 and the top of the docking tube 2, and the sealing member 22 is used to provide a seal between the docking tube 2 and the vibration guide rope 6 (a small gap is allowed to facilitate the activity or removal of the corresponding structure, and the exhaust device 3 can provide strong suction, so even if there is a small amount of leakage here, it will not affect the promotion effect on the concrete).

[0037] In the above embodiment, the vibration guide rope 6 can adopt a rigid structure, such as thin steel bars, which 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. 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, so that during pouring, the concrete at the bottom of the prefabricated unit panel 1 is vibrated to improve the concrete filling effect.

[0038] 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 vibration guide cable 6 in multiple directions is usually set on the prefabricated unit panel 1. Based on the above-mentioned fixed vibration guide cable 6, the vibration guide cable 6 will eventually form a structure pre-buried at the bottom of the prefabricated unit panel 1, which will cause certain waste. In order to save construction costs and reduce material waste, this embodiment also provides the following technical solutions. Specifically, the vibration guide cable 6 is an elastic structure, such as a steel wire rope, a thin iron wire, a plastic strip, etc., which can produce an adaptive deformation structure. At the same time, the vibration guide cable 6 corresponds to the prefabricated unit panel 1. The position at the edge is connected to the prefabricated unit board 1 through a traction plate 61, and the traction plate 61 is fixedly installed on the prefabricated unit board 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 arranged between the vibration guide rope 6 and the prefabricated unit board 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 board 1. Since the vibration guide rope 6 is made of deformable elastic material, when use is over, the vibration guide rope 6 can be forcefully pulled out from the outside to achieve recovery of the vibration guide rope 6.

[0039] 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 part of the vibration guide rope 6 is arranged between the driving roller 41 and the squeezing roller 42. When the vibration docking part 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. A detachable baffle ring 63 is fixedly connected to one end of the vibration guide rope 6 corresponding to the traction plate 61, wherein the detachable baffle ring 63 is fixedly connected to the vibration guide rope 6 through a breakable weak connecting part (such as a plastic sheet), and a reverse traction elastic part 64 is arranged between the detachable baffle 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. Moreover, since the vibration guide rope 6 itself can be bent and deformed, and the prefabricated unit plate 1 is provided with a Multiple groups of guide rings 62, therefore, although the vibration guide cable 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 cable 6 in the opposite direction when pressing the vibration docking portion of the vibration guide cable 6 downward, and then cooperate with the micro-reciprocating rotation of the driving roller 41 to form a mobile vibration of the vibration guide cable 6, and when the construction is completed, the driving roller 41 is driven to rotate continuously, and the vibration guide cable 6 can also be pulled out of the prefabricated unit board 1. At this time, the detachable retaining ring 63 can be broken when the vibration guide cable 6 is forced to be pulled, thereby detaching from the vibration guide cable 6, and the vibration guide cable 6 can be smoothly pulled out, and in the process of pulling out the vibration guide cable 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, 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.

[0040] 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 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 is 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.

[0041] Furthermore, in the present embodiment, in order to facilitate construction, the exhaust device 3 and the vibration device 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 device 4 is installed on the output end of the lifting drive 51. The lifting drive 51 is a commonly used lifting and lifting structure (such as a combination of a vertical guide rail and a hydraulic cylinder), so as to facilitate the movement of the vibration device 4 and the exhaust device 3. By controlling the lifting and lowering of the vibration device 4, it is more convenient to connect and cooperate with the vibration guide rope 6, thereby improving the convenience of equipment use.

[0042] This embodiment provides a solution for a sealing member 22. Figure 6 and Figure 7 , that is, 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 of each vibration guide wire 6 passes through the conical closure member 221, the conical closure member 221 is preferably a rubber structure, and the conical closure member 221 is spliced ​​together by two semi-conical structures, and a hole for the vibration guide wire 6 to pass through is provided between the two. 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 member 221, and the conical closure member 221 is squeezed downward 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 will not affect the negative pressure state in the docking tube 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, so that the conical closure 221 is separated from the conical cavity 23, and the two semi-conical structures can be separated to separate from the vibration guide rope 6.

[0043] In addition, this embodiment also provides another solution of the sealing member 22, see the attached 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 cable 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 cable 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 cable 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 at the bottom of the butt-joint pipe 2 and the prefabricated unit plate 1 to fluctuate, so as to make the flow of concrete fluctuate, facilitate the filling of concrete, and improve the effect of air separation.

[0044] Refer to the instruction manual Fig. 9 and Fig.10 In order to facilitate the docking connection of the prefabricated unit board 1, the present embodiment also provides the following technical solutions. Specifically, a mounting hole 15 is provided at the position of the inner part of the prefabricated unit board 1 corresponding to the raised protrusion 14, a rolling ball 7 is provided at the bottom of the mounting hole 15, and 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, and the extrusion column 71 is threadedly connected with the pre-buried threaded sleeve 72. Then, by means of the extrusion column 71, the rolling ball 7 is extruded. In the process of actually assembling the prefabricated unit board 1, the rolling ball 7 protrudes from the bottom of the raised protrusion 14, thereby forming a rolling support, so as to facilitate the position of the prefabricated unit board 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 and fixed with the foundation surface. 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 the foundation surface is uneven, 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.

[0045] 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 arranged at the docking surface of the docking member 11. The semi-cylinders 111 between the two groups of docking members 11 that are docked with each other are arranged alternately, 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 the docking member 11 is provided with an expansion connection hole 112. 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 extrusion plates 113 are provided between both ends of the locking bolt 114 and the docking piece 11, and the extrusion plates 113 cover 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 holes 112 of the corresponding two sets of docking pieces 11, and the two sets of extrusion plates 113 are installed at 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 plates 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.

[0046] Refer to the instruction manual Fig.11 The present invention also provides a prefabricated flat raft foundation construction method, comprising the following steps: 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 panel 1 through 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, thereby accelerating the flow of concrete to the bottom area of ​​the prefabricated unit board 1; 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; 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.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope 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 butt joints (11) on all sides thereof, wherein the butt joints (11) are used to butt joint and install two adjacent prefabricated unit plates (1), and the prefabricated unit plate (1) is also provided with reserved steel bars (12) on all sides thereof, characterized in that: The bottom of the prefabricated unit panel (1) is provided with a raising protrusion (14), and the raising protrusion (14) is used to form a reserved space between the bottom of the prefabricated unit panel (1) and the foundation surface; The prefabricated unit plate (1) is also provided with a reserved through hole (13) penetrating from top to bottom, a butt joint pipe (2) is detachably mounted on the reserved through hole (13), an exhaust connection pipe (21) is provided on the butt joint pipe (2), the exhaust connection pipe (21) is used to connect an exhaust device (3), and the exhaust device (3) is used to form a negative pressure in the bottom area of ​​the prefabricated unit plate (1); A vibration guide cable (6) is provided at the bottom of the prefabricated unit panel (1), one end of the vibration guide cable (6) extends to the edge of the prefabricated unit panel (1), the other end of the vibration guide cable (6) extends into the butt joint tube (2) and passes through the top of the butt joint tube (2), forming a vibration butt joint portion extending out of the butt joint tube (2), the vibration butt joint portion being used to be connected to a vibration device (4), and a closing member (22) is provided between the vibration guide cable (6) and the top of the butt joint tube (2).

2. A prefabricated flat plate raft foundation according to claim 1, characterized in that: The vibration guide cable (6) is an elastic structure. The vibration guide cable (6) is connected to the prefabricated unit plate (1) via a traction plate (61) at a position corresponding to the edge of the prefabricated unit plate (1). The traction plate (61) is fixedly mounted on the prefabricated unit plate (1). The vibration guide cable (6) passes through the traction plate (61) and is slidably connected to the traction plate (61). A plurality of guide rings (62) are also arranged between the vibration guide cable (6) and the prefabricated unit plate (1). The plurality of guide rings (62) are evenly distributed in the length direction of the vibration guide cable (6), and the guide rings (62) are fixedly mounted on the prefabricated unit plate (1).

3. A prefabricated flat plate raft foundation according to claim 2, characterized in that: The vibration device (4) comprises a driving roller (41) and a squeezing roller (42), wherein a groove structure for accommodating a vibration docking portion of a vibration guide rope (6) is provided between the driving roller (41) and the squeezing roller (42), and 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), and a detachable retaining ring (63) is fixedly connected to one end of the vibration 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).

4. The prefabricated flat plate raft foundation according to claim 3, 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); the movable regulator is used to adjust the distance between the squeezing movable frame (44) and the driving roller (41).

5. The prefabricated flat plate raft foundation according to claim 4, 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).

6. The prefabricated flat plate raft foundation according to claim 5, 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.

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

8. A prefabricated flat plate raft foundation according to claim 6 or 7, 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).

9. The prefabricated flat plate raft foundation according to claim 8, characterized in that: A plurality of groups of semi-cylinders (111) are arranged at the butt joint surface of the butt joint member (11), and the semi-cylinders (111) between two groups of butt joint members (11) are arranged in a staggered manner. The butt joint member (11) is provided with an expansion connection hole (112), and the expansion connection holes (112) of the two corresponding groups of butt joint 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 extrusion plates (113) are arranged between both ends of the locking bolt (114) and the butt joint member (11).

10. A construction method for a prefabricated flat raft foundation as claimed in claim 9, 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: injecting 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 panel (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 waited for to solidify.

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