A simple pile foundation for soft soil layers

Abstract

The present invention relates to the technical field of outdoor power grid operations, and particularly to a simple pile foundation for soft soil layers, which includes a pile rod, a ball screw, a ball nut, an extension rod, a slider, a bearing plate, a pile foundation, a worm gear, a worm and a rotating rod. An installation groove is formed inside the pile rod. One end of the ball screw is rotatably connected to the middle position of the bottom inner wall of the installation groove through a bearing. The ball nut is in transmission connection with the outer surface of the ball screw. The four sides of the surface of the ball nut are respectively fixedly connected to one side of the four hinges. The present invention achieves the purpose of improving the stability of the pile foundation in soft soil layers, and has the advantages of reasonable structural design, strong bearing capacity, strong structural stability, high bending and shear strength, effectively reducing the settlement amount, more uniform settlement, strong horizontal load bearing capacity, reducing lateral displacement, high connection strength, high anti-pulling strength, and strong practicability. At the same time, the overall structure is simple and can meet the usage requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of outdoor power grid operations, and particularly to a simple pile foundation in soft soil layers. Background Art

[0002] The overall power grid consists of various voltage substations and transmission and distribution lines in the power system. It includes three units: power transformation, power transmission, and power distribution. The task of the power grid is to transmit and distribute electric energy and change the voltage. The erection of the transmission grid is mainly carried out through transmission towers at high altitudes, and climbing the towers is required for daily maintenance operations.

[0003] When temporarily laying cables during outdoor power grid maintenance and erection, it is necessary to bury simple pile foundations on the ground for support and fixation. Since the power transmission system composed of temporary cables has a large span, the stability of the pile foundation directly affects the stability after cable erection. Among them, the construction of pile foundations in soft soil layers has always been a major problem affecting the stability of pile foundations. Due to the relatively soft nature of the soft soil layer, the pile foundation is prone to settlement, and when the pile foundation bears a large horizontal load, it is prone to tilt, affecting the stability of the upper structure. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a simple pile foundation in soft soil layers, achieving the purpose of improving the stability of the pile foundation in soft soil layers. It has the advantages of reasonable structural design, strong bearing capacity, strong structural stability, high flexural and shear strength, effectively reducing the settlement amount, more uniform settlement, strong horizontal load-bearing capacity, reducing lateral displacement, high connection strength, high anti-pulling strength, and strong practicability. At the same time, the overall structure is simple and can meet the usage requirements.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] A simple pile foundation in soft soil layers includes a pile rod, a ball screw, a ball nut, a hinge, an extension rod, a slider, a bearing plate, a pile foundation, a worm gear, a worm, and a rotating rod. An installation groove is provided inside the pile rod. One end of the ball screw is rotatably connected to the middle position of the bottom inner wall of the installation groove through a bearing. The ball nut is in transmission connection with the outer surface of the ball screw. The ball nut is circumferentially provided with extension rods. Channels are provided on all four sides of the pile rod. The channels are located at the bottom of the inner side wall of the installation groove and are in communication with it. The lower part of the extension rod is located in the channel. The upper end of the extension rod is connected to the ball nut and restricts its rotation.

[0007] Furthermore, the cross-section of the extension rod is in a semi-circular arc shape, and the extension rods are evenly distributed at equal distances around the pile rod.

[0008] Furthermore, the shape of the channel matches the shape of the extension rod, the channel is inclined, and the angle between the top of the channel and the horizontal plane is sixty degrees.

[0009] Furthermore, a tip is provided at the bottom of the pile rod, the top of the pile rod is fixedly connected to the middle position of the bottom of the bearing plate, and the middle position of the top of the bearing plate is detachably connected to the bottom of the pile foundation.

[0010] Furthermore, a placement groove is opened inside the pile foundation, and the top of the ball screw extends into the inside of the placement groove in turn, and the top of the ball screw is rotatably connected to the middle position of the top of the inner wall of the placement groove through a bearing.

[0011] Furthermore, the upper part of the outer surface of the ball screw is fixedly connected to the inner wall of the worm wheel through a flat key, and the two sides of the inner wall of the placement groove are rotatably connected to the two ends of the worm through bearings respectively, and the worm is meshingly connected with the worm wheel.

[0012] Furthermore, the ball nut is circumferentially fixed with a pressure ring, and a cover-shaped limit piece is arranged at the bottom of the pressure ring, the cover-shaped limit piece includes a base, and a radial limit groove is arranged on the bottom surface of the base corresponding to the extension rod, and a limit ring is arranged on the edge of the top surface of the cover-shaped limit piece. When the cover-shaped limit piece is lowered to the bottom of the installation groove, the height of the limit ring is higher than the height of the opening of the channel inside the installation groove, and a mounting hole is opened in the middle of the base, and the inner diameter of the mounting hole is larger than the outer diameter of the ball nut and smaller than the inner diameter of the pressure ring; a longitudinal guide piece is fixedly installed on the bottom of the pressure ring, and a guide groove is opened at the corresponding position of the base.

[0013] Furthermore, a blocking piece is provided at the opening outside the channel, and the blocking piece can prevent the extension rod from falling out of the channel when the ball nut is not pressed down.

[0014] Furthermore, the pile rod is provided with a plugging piece installation groove at the height of the opening outside the channel, and the plugging piece is in the shape of an annular belt and is fixedly installed in the plugging piece installation groove.

[0015] The present invention has the following beneficial effects:

[0016] 1. By rotating the ball screw in the clockwise direction, since the rotational motion between the ball screw and the ball nut is converted into a linear motion, at this time, the ball nut moves linearly downward. Through the pressure ring and the cap-shaped limiting member, the extension rod is in a synchronous motion state when the ball nut moves downward. The extension rod extends around through the channel and is always inserted into the surrounding soil layer at a sixty-degree downward inclination. Therefore, it can form an attachment to the surrounding soil layer, enabling the structure to withstand a greater horizontal thrust, reducing the structural bending moment, maintaining the stability of the structure, and when used in a row, it can attach to the surrounding soil, avoiding the phenomenon of pile foundation settlement caused by soft soil, thus meeting the stability requirements for cable erection.

[0017] 2. Due to the setting of the slider and the chute in the present invention, through the sliding action of the slider inside the chute, the extension movement of the extension rod can be restricted in its trajectory. Therefore, the stability of the extension rod's movement is improved. At the same time, the extension rod can always maintain an inclination angle of sixty degrees, so it can form a right triangle within each plane around the pile rod, thereby improving the stability of the entire pile foundation, enhancing the wind resistance and anti-collapse performance. And in combination with the semi-circular arc structure of the extension rod, it can reduce the contact area with the soil layer during extension, so it is convenient to insert into the soil layer, and at the same time, it can maintain good mechanical strength.

[0018] 3. After the pile foundation of the present invention is erected, the worm gear and worm, and the screw and nut device can be taken out and reused, reducing material loss and greatly reducing the construction cost.

[0019] 4. The present invention has the advantages of reasonable structural design, strong bearing capacity, strong structural stability, high bending and shear resistance strength, effectively reducing the settlement amount, more uniform settlement, strong horizontal load bearing capacity, reducing lateral displacement, high connection strength, high anti-pulling strength, and strong practicability. At the same time, the overall structure is simple and can meet the usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a front view schematic diagram of the structure of the present invention;

[0021] Figure 2 is a cross-sectional schematic diagram of the pile rod of the structure of the present invention;

[0022] Figure 3 is a single-structure schematic diagram of the extension rod of the structure of the present invention;

[0023] Figure 4 is a cross-sectional schematic diagram of the pile foundation of the structure of the present invention;

[0024] Figure 5 is a bottom view structural schematic diagram of the cap-shaped limiting member of the present invention;

[0025] Figure 6 Schematic diagram of the upward view of the pressure ring of the present invention;

[0026] Figure 7 Schematic diagram of the structure during the downward pressing process of the ball screw nut of the present invention;

[0027] Figure 8 Schematic diagram of the structure after the downward pressing is completed of the present invention;

[0028] Figure 9 Schematic diagram of the structure after the screw rod and nut of the present invention are taken out.

[0029] In the figure: 1, pile rod; 101, blocking piece; 102, blocking piece installation groove; 2, installation groove; 3, ball screw; 4, ball nut; 41, pressure ring; 42, guide piece; 5, cap-shaped limiting part; 51, base; 52, limiting edge; 53, limiting groove; 54, limiting ring, 55, installation hole; 56, guide groove; 6, extension rod; 7, channel; 8, slider; 9, chute; 10, bearing plate; 11, pile foundation; 12, placement groove; 13, worm gear; 14, worm; 15, rotating rod. Specific embodiments

[0030] As Figure 1 , 2 shown, a simple pile foundation for soft soil layers includes a pile rod 1, a ball screw 3, a ball nut 4, a cap-shaped limiting part 5, an extension rod 6, a slider 8, a bearing plate 10, a pile foundation 11, a worm gear 13, a worm 14 and a rotating rod 15. An installation groove 2 is opened inside the pile rod 1. One end of the ball screw 3 is rotationally connected to the middle position of the bottom of the inner wall of the installation groove 2 through a bearing. The ball nut 4 is in transmission connection with the outer surface of the ball screw 3. A pressure ring 41 is welded circumferentially on the ball nut 4. A cap-shaped limiting part 5 is arranged at the bottom of the pressure ring 41. The cap-shaped limiting part 5 includes a base 51. Four channels 7 are evenly distributed circumferentially and at the same height on the pile rod 1. The lower parts of the four extension rods 6 are arranged in the channels 7 and the upper ends are connected to the bottom of the cap-shaped limiting part 5. As Figure 5 shown, the cap-shaped limiting part 5 includes a base 51. Radial limiting grooves 53 are arranged on the bottom surface of the base 51 corresponding to each extension rod 6. The limiting grooves 53 are composed of two limiting edges 52 welded to the bottom surface of the base 51. The top of the extension rod 6 is embedded in the limiting groove 53 and can slide along the limiting groove 53. An installation hole 55 is opened in the middle of the base 51. The inner diameter of the installation hole 55 is larger than the outer diameter of the ball nut 4 and smaller than the inner diameter of the pressure ring 41. A limiting ring 54 is arranged at the edge of the top surface of the base 51. When the cap-shaped limiting part 5 descends to the bottom of the installation groove 2, the height of the limiting ring 54 is higher than the height of the opening of the channel 7 inside the installation groove. The limiting ring 54 can also keep the cap-shaped limiting part 5 in a horizontal state in the installation groove 2. The base 51 is also provided with a guide groove 56. As Figure 6As shown, a guide piece 42 longitudinally disposed at the bottom of the pressing ring 41 has a shape and position matching that of the guide groove 56. When the guide piece 42 is inserted into the guide groove 56, relative rotation between the pressing ring 41 and the cap-shaped limiting member 5 can be avoided.

[0031] The channel 7 is located at the bottom of the inner side wall of the installation groove 2 and is in communication with it. The top of the inner wall of the channel 7 is fixedly connected to the top of the slider 8. As Figure 3 shown, the extension rod 6 has a semi-circular arc cross-section and is provided with a sliding groove 9 for cooperating with the slider 8. By rotating the ball screw 3 in the clockwise direction, since the rotational motion mutually matched between the ball screw 3 and the ball nut 4 is converted into a linear motion, at this time, the ball nut 4 moves linearly downward. At the same time, the four extension rods 6 are in a synchronous motion state when the ball nut 4 moves downward. Therefore, the four extension rods 6 all extend around through the channel 7 and are always inserted into the surrounding soil layer in a state of being inclined downward at sixty degrees. Therefore, the surrounding soil layer can be grasped, the contact area is increased, and the horizontal load-bearing capacity of the pile foundation 11 is improved, enabling the structure to withstand a large horizontal thrust, reducing the structural bending moment, keeping the structure stable, reducing the lateral displacement amount, and being able to improve the linear bearing capacity of the entire pile foundation 11, avoiding the phenomenon that the pile foundation 11 settles due to soft soil, thereby meeting the stability requirements for cable erection.

[0032] The extension rod 6 has a semi-circular arc cross-section, and the end of the extension rod 6 located inside the channel 7 is a tip portion. As Figure 3 shown. The four extension rods 6 are evenly distributed at equal distances around the pile rod 1. The shape of the channel 7 matches the shape of the extension rod 6. The channel 7 is inclined, and the angle between the top of the channel 7 and the horizontal plane is sixty degrees. Due to the setting of the slider 8 and the sliding groove 9, through the sliding action of the slider 8 inside the sliding groove 9, the extension movement trajectory of the extension rod 6 can be restricted, so the stability of the movement of the extension rod 6 is improved. At the same time, the extension rod 6 can always be kept inclined at an angle of sixty degrees, so a right triangle can be formed within each surface around the pile rod 1, thereby being able to improve the stability of the entire pile foundation 11, improve the wind resistance and anti-toppling performance, and cooperate with the semi-circular arc structure of the extension rod 6 to reduce the contact area with the soil layer during extension, so it is convenient to insert into the soil layer, and at the same time, it can maintain good mechanical strength. A plug piece installation groove 102 is provided at the height of the outer opening of the channel 7. A plug piece 101 is arranged in the plug piece installation groove 102. The plug piece 101 is in a ring-shaped band shape and has a moderate hardness, such as a thin iron sheet, and is fixed by bonding or welding. When the pile foundation is moved or vibrated during pile driving, the plug piece can prevent the extension rod 6 inside the channel 7 from coming out, affecting the pile driving effect.

[0033] The bottom of the pile rod 1 is provided with a tip. The top of the pile rod 1 is fixedly connected to the middle position of the bottom of the bearing plate 10. The middle position of the top of the bearing plate 10 is connected to the bottom of the pile foundation 11. The connection between the bearing plate 10 and the pile foundation 11 is detachable, such as screw connection or flange connection. A through hole for the ball screw 3 to pass through is opened in the middle of the bearing plate 10. Since the above connection method is a commonly used connection method in the mechanical field, it is not shown in the figure. As Figure 4 shown, a placement groove 12 is opened inside the pile foundation 11. The top of the ball screw 3 sequentially extends into the inside of the placement groove 12. The top of the ball screw 3 is rotationally connected to the middle position of the inner wall of the top of the placement groove 12 through a bearing. The upper part of the outer surface of the ball screw 3 is fixedly connected to the inner side wall of the worm gear 13 through a flat key. Both sides of the inner wall of the placement groove 12 are rotationally connected to both ends of the worm 14 through bearings. The worm 14 is in meshing transmission connection with the worm gear 13. The right end of the worm 14 is fixedly connected to one end of the rotating rod 15. The other end of the rotating rod 15 extends to the outside of the right side of the pile foundation 11. The shape of the rotating rod 15 is Z-shaped. A protective sleeve is sleeved on the right side of the outer surface of the rotating rod 15. The present invention has the advantages of reasonable structural design, strong bearing capacity, strong structural stability, high bending and shear resistance strength, effectively reducing the settlement amount, more uniform settlement, strong horizontal load bearing capacity, reducing lateral displacement, high connection strength, high anti-pulling strength, and strong practicability. At the same time, the overall structure is simple and can meet the use requirements.

[0034] During the use process, the entire pile rod 1 is knocked into the soil layer by using a tool. At this time, the bottom of the bearing plate 10 is in contact with the ground. Then, the rotating rod 15 is rotated clockwise. Due to the meshing transmission connection state between the worm 14 and the worm gear 13, the rotating rod 15 drives the worm gear 13 to rotate through the worm 14. The worm gear 13 drives the entire ball screw 3 to rotate. The ball screw 3 and the ball nut 4 cooperate with each other. Since the ball nut 4 is fixedly connected to the pressure ring and the rotation of the pressure ring is restricted by the guide piece 42, and the extension rod 6 restricts the rotation of the cap-shaped limiting member 5 due to the limiting groove 53 at the bottom of the cap-shaped limiting member 5, the extension rod 6 finally restricts the rotation of the ball nut 4. Therefore, the rotation of the ball screw 3 is converted into the linear motion of the ball nut 4 downward. At the same time, the four extension rods 6 are in a synchronous motion state when the ball nut 4 moves downward. During the movement process, the top of the extension rod 6 slides outward along the limiting groove 53. The four extension rods 6 all extend through the channel 7 and break through the blocking piece 101 and extend around, and are always inserted into the surrounding soil layer at a sixty-degree downward inclination, as Figure 7As shown, it can thus grip the surrounding soil layer, increasing the contact area, enhancing the horizontal load-bearing capacity of the pile foundation 11, enabling the structure to withstand a large horizontal thrust, reducing the structural bending moment, and maintaining the stability of the structure. When the ball nut 4 reaches the lowest point, the extension rod 6 completely enters the channel 7, and the limit ring 54 blocks the channel 7. The inward and outward displacements of the extension rod 6 are respectively restricted by the cap-shaped limit member 5 and the slider 8, thus ensuring that the extension rod does not come out of the channel 7 or retract into the installation groove, as Figure 8 shown.

[0035] As Figure 9 shown, after the pile foundation is installed, the ball screw 3, the ball nut 4, and all the installation components inside the pile foundation 11 can be disassembled and reused, effectively saving materials, as Figure 9 shown.

[0036] In this embodiment, the ball nut is matched with four extension rods. In actual applications, designers can use any number of extension rods according to the local geological conditions. That is to say, changes in the number of extension rods also fall within the protection scope of the present invention. In addition to the above structure, the blocking piece 101 can also be other structures, such as an iron sheet with a shape matching the outer hole of the channel 7, spot-welded to the outer hole of the channel 7, which can achieve the same effect. To improve the installation speed, the rotating rod 15 can also be replaced with a power source such as an electric motor.

Claims

1. A simple pile foundation for soft soil layers, comprising a pile rod (1), a ball screw (3), a ball nut (4), a hinge (5), an extension rod (6), a slider (8), a bearing plate (10), a pile foundation (11), a worm gear (13), a worm (14) and a rotating rod (15), characterized in that: An installation groove (2) is formed inside the pile rod (1). One end of the ball screw (3) is rotatably connected to the middle position of the bottom inner wall of the installation groove (2) through a bearing. The ball nut (4) is in transmission connection with the outer surface of the ball screw (3). An extension rod (6) is circumferentially arranged on the ball nut (4). Channels (7) are formed on all four sides of the pile rod (1). The channels (7) are located at the bottom of the inner side wall of the installation groove (2) and are in communication with it. The lower part of the extension rod (6) is located in the channels (7). The upper end of the extension rod (6) is connected to the ball nut (4) and restricts its rotation. A tip is provided at the bottom of the pile rod (1). The top of the pile rod (1) is fixedly connected to the middle position of the bottom of the bearing plate (10). The middle position of the top of the bearing plate (10) is detachably connected to the bottom of the pile foundation (11). A placement groove (12) is formed inside the pile foundation (11). The top of the ball screw (3) extends into the interior of the placement groove (12) in sequence. The top of the ball screw (3) is rotatably connected to the middle position of the top inner wall of the placement groove (12) through a bearing. The upper part of the outer surface of the ball screw (3) is fixedly connected to the inner side wall of the worm gear (13) through a flat key. Both ends of the worm (14) are rotatably connected to both sides of the inner wall of the placement groove (12) through bearings. The worm (14) is in meshing transmission connection with the worm gear (13). A pressure ring (41) is fixedly installed circumferentially on the ball nut (4). A cap-shaped limiting member (5) is provided at the bottom of the pressure ring (41). The cap-shaped limiting member (5) includes a base (51). A radial limiting groove (53) corresponding to the extension rod (6) is provided on the bottom surface of the base (51). A limiting ring (54) is provided at the edge of the top surface of the cap-shaped limiting member (5). When the cap-shaped limiting member (5) descends to the bottom of the installation groove (2), the height of the limiting ring (54) is higher than the height of the opening of the channel (7) inside the installation groove. An installation hole (55) is formed in the middle of the base (51). The inner diameter of the installation hole (55) is larger than the outer diameter of the ball nut (4) and smaller than the inner diameter of the pressure ring (41). A longitudinal guide piece (42) is fixedly installed at the bottom of the pressure ring. A guide groove (56) is formed at the corresponding position of the base (51).

2. The simple pile foundation for soft soil layers according to claim 1, characterized in that: The cross section of the extension rod (6) is in a semi-circular arc shape. The extension rods (6) are evenly distributed at equal distances around the four sides of the pile rod (1).

3. The simple pile foundation for soft soil layers according to claim 1, characterized in that: The shape of the channel (7) matches the shape of the extension rod (6). The channel (7) is inclined, and the included angle between the top of the channel (7) and the horizontal plane is sixty degrees.

4. The simple pile foundation for soft soil layers according to claim 1, characterized in that: A blocking piece (101) is provided at the opening of the channel (7) outside. The blocking piece (101) can prevent the extension rod (6) from slipping out of the channel (7) when not pressed by the ball nut (4).

5. The simple pile foundation for soft soil layers according to claim 1, characterized in that: A blocking piece installation groove (102) is provided at the height of the opening of the channel (7) outside the pile rod (1). The blocking piece (101) is in a ring-shaped band shape and is fixedly installed in the blocking piece installation groove (102).

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