A top-expanding reinforced branch pile system and a construction process thereof

Abstract

The application relates to a top-expanding reinforced branch disc pile system and a construction process thereof, which comprises a branch disc top-expanding device and a steel reinforcement cage, the branch disc top-expanding device is used for forming a branch disc, a plurality of branch discs are embedded in the steel reinforcement cage, and the branch discs are coaxially arranged with the steel reinforcement cage; the branch disc stress steel reinforcement mounting device is further included, a plurality of steels are inserted into the branch disc, the steels are distributed along the branch disc in the radial direction, and a top-expanding reinforced branch disc pile steel framework is formed; then, concrete is poured to form the top-expanding reinforced branch disc pile; the application can improve the size, strength and toughness of the branch disc, and can greatly improve the vertical and horizontal bearing capacity of the pile foundation.

Description

TECHNICAL FIELD

[0001] The present application relates to a top expansion reinforced branch disc pile system and its construction process, belonging to the field of civil engineering branch disc pile application and construction. BACKGROUND

[0002] Pile is the most common form of foundation engineering, because of its simple and efficient construction process, small environmental impact and other advantages, it is widely used in high-rise buildings, high-speed railways, port bridges. But due to the inevitable disturbance of the soil around the pile during construction, the side resistance and end bearing capacity are affected, and the single pile bearing capacity is greatly reduced.

[0003] In order to solve the above problems, the extruded branch disc pile appears, which changes the original single end bearing point of the end bearing friction pile into multiple end bearing points of the friction end bearing pile, thereby changing the stress mechanism of the pile and greatly increasing the bearing capacity of the pile. However, the extruded branch disc pile is mostly used for small diameter and short pile type, and the working condition is limited; special drilling equipment is needed when forming the extruded branch disc pile, and the extruded disc needs to be replaced back and forth during construction, which increases the construction time and cost, and the continuous replacement of the extruded disc also leads to the possibility of hole collapse. At the same time, the size of the drilling equipment is limited, the area of the branch disc is small, and it cannot be reinforced, the shear strength of the plain concrete is poor, which leads to limited improvement of the pile foundation bearing capacity, so a new method is needed to overcome the above problems. SUMMARY

[0004] The present application provides a top expansion reinforced branch disc pile system and its construction process, which greatly improves the vertical and horizontal bearing capacity of the pile foundation.

[0005] The technical scheme adopted by the present application to solve its technical problems is:

[0006] A top expansion reinforced branch disc pile system, comprising a branch disc top expansion device and a steel reinforcement cage, the branch disc top expansion device is used for forming a branch disc, a plurality of branch discs are embedded in the steel reinforcement cage, and the branch disc and the steel reinforcement cage are coaxially arranged;

[0007] It also includes a branch disc stress steel bar installation device, which inserts a plurality of steel bars into the branch disc, the steel bars are distributed radially along the branch disc to form a top expansion branch disc pile steel reinforcement cage;

[0008] As a further preferred embodiment of the present application, the branch disc top expansion device comprises a motor, a force transmission rod, an oil tank, a jack, an oil pressure pipe and a pressure plate,

[0009] Symmetrically distributed jacks are installed on both sides of the oil tank, the extension end of the jack is perpendicular to the central axis of the pile body; the pressure plate is fixed at the extension end of the jack, the jack is started, and the pressure plate is pushed out radially outward along the pile hole, and the pushing distance is 0.5-2.0 times the pile diameter;

[0010] One end of the force transmission rod is vertically fixed at the center of the top of the oil storage tank, that is, the force transmission rod is coaxial with the pile hole; the other end of the force transmission rod is connected with the motor shaft of the motor;

[0011] The top of the oil storage tank also reserves a hydraulic oil passage opening, and the hydraulic oil passage opening is connected with the oil pressure pipe;

[0012] As a further preferred embodiment of the present application, when the motor is started, the force transmission rod rotates, and the pressure bearing plate fixed at the telescopic end of the jack rotates around the force transmission rod to form a cylindrical top expansion disc;

[0013] As a further preferred embodiment of the present application, the pressure bearing plate is curved towards the inner side of the jack and is formed in a rectangular or square or triangular pyramid shape;

[0014] As a further preferred embodiment of the present application, a plurality of support rods are arranged between the pressure bearing plate and the jack towards the inner side of the jack, the plurality of support rods are distributed around the circumferential wall of the support rod, and each support rod forms an included angle of 45-60 degrees with the jack;

[0015] As a further preferred embodiment of the present application, the reinforcement cage comprises a plurality of coaxially arranged stirrups, a plurality of vertical bars are fixed along the circumference of the stirrups, the vertical bars are parallel to the central axis of the pile hole, and the adjacent stirrups are connected by a plurality of vertical bars;

[0016] The disc top expansion device is arranged inside the reinforcement cage and coaxial with the reinforcement cage;

[0017] As a further preferred embodiment of the present application, the disc force bearing reinforcement mounting device comprises a conveyor belt skeleton, a conveyor belt, a transmission gear, a reinforcement fixing gear, a base, and a reinforcement driving device,

[0018] A reinforcement transportation channel is formed on the surface of the base, the center of the reinforcement transportation channel is defined as the origin, the central line direction is the X-axis, the direction perpendicular to the central line is the Y-axis, and the direction perpendicular to the surface of the base is the Z-axis, and a three-dimensional coordinate system is established;

[0019] The conveyor belt skeletons are respectively arranged on the Y-axes on both sides of the reinforcement transportation channel, and the conveyor belt skeletons are parallel to the Z-axis; the transmission gears are arranged at the ends of each conveyor belt skeleton, and the transmission gears at the two ends are connected by the conveyor belt; the reinforcement fixing gears are arranged on the surfaces of the conveyor belts, and the reinforcement fixing gears arranged oppositely on the two conveyor belt skeletons are spliced to form a transportation cavity for fixing the reinforcement; the reinforcement fixing gears are made of rubber;

[0020] The reinforcement driving device is also arranged on the reinforcement transportation channel, and the driving force of the reinforcement driving device inserts the reinforcement transported by the conveyor belt into the disc;

[0021] As a further preferred embodiment of the present application, the reinforcing bar driving device comprises a door-shaped frame, a horizontal servo motor, a vertical servo motor, a guide rail and a reinforcing bar driving machine,

[0022] On both sides of the reinforcing bar conveying channel, a guide rail is arranged parallel to the X-axis direction, and the bottom ends of the two vertical parts of the door-shaped frame are slidably connected to the guide rail; a horizontal servo motor is arranged at the bottom end of the vertical part of the door-shaped frame;

[0023] The vertical servo motor is mounted on the horizontal part of the door-shaped frame, the driving shaft of the vertical servo motor is connected to the reinforcing bar driving machine, and the reinforcing bar driving machine is mounted with a driving roller for pressing the reinforcing bar relative to the end of the reinforcing bar conveying channel;

[0024] As a further preferred embodiment of the present application, a plurality of reinforcing bar conveying channel rollers are arranged in the reinforcing bar conveying channel;

[0025] Based on the construction process of the top-expanding reinforced branch disc pile system, the construction process comprises the following steps:

[0026] Step S1: design the reinforcing cage, the top-expanding disc and the jack according to the size of the pile body and the bearing requirement;

[0027] Step S2: determine the position of the branch disc formed by the branch disc top-expanding device in the reinforcing cage;

[0028] Step S3: start the branch disc top-expanding device, the jack pushes out the pressure plate, forms the branch disc, and embeds the branch disc in the reinforcing cage;

[0029] Step S4: lower the reinforcing cage provided with the branch disc into the pile hole;

[0030] Step S5: hoist the branch disc stress reinforcing bar installation device to each branch disc position, start the branch disc stress reinforcing bar installation device, insert the reinforcing bar into the branch disc along the radial direction of the branch disc, and form the top-expanding branch disc pile reinforcing cage;

[0031] Step S6: after the reinforcing bars are completely installed, pour concrete into the top-expanding branch disc pile reinforcing cage to form the top-expanding reinforced branch disc pile.

[0032] Through the above technical scheme, compared with the prior art, the present application has the following beneficial effects:

[0033] 1. The top-expanding reinforced branch disc pile system provided by the present application, the branch disc top-expanding device is used for forming the branch disc, without the need to replace the extrusion-expanding disc back and forth, thereby saving construction time and construction cost;

[0034] 2. The top-expanding reinforced branch disc pile system provided by the present application is not limited by the size of the pile foundation, can obtain a pile foundation suitable for various working conditions, the formed branch disc is regular, a plurality of reinforcing bars are inserted into the branch disc through the branch disc stress reinforcing bar installation device, and the horizontal and vertical bearing capacity of the pile foundation is greatly improved.

[0035] 3、The top expansion reinforced branch disc pile system provided by the application can control the top expansion distance of the branch disc, thereby improving the size of the branch disc and further improving the strength and toughness of the branch disc. BRIEF DESCRIPTION OF DRAWINGS

[0036] The application will be further described below in combination with the drawings and examples.

[0037] Figures la-b is a schematic diagram of the overall structure of the branch disc top expansion device provided by the application, wherein Figure la is a structure when the pressure bearing plate is a flat plate, Figure lb is a structure when the pressure bearing plate is a triangular pyramid;

[0038] Figure 2 is a schematic diagram of the structure of the branch disc stress reinforcing bar installation device provided by the application;

[0039] Figure 3 is a forming structure involved in the construction process based on the top expansion reinforced branch disc pile system provided by the application.

[0040] In the figure: 1 is a jack, 2 is an oil storage tank, 3 is a hydraulic oil passage port, 4 is a top expansion disc, 5 is a force transmission rod, 6 is an oil pressure pipe, 7 is a support rod, 8 is a motor, 9 is a conveyor belt skeleton, 10 is a conveyor belt, 11 is a transmission gear, 12 is a reinforcing bar fixing gear, 13 is a base, 14 is a reinforcing bar transportation channel, 15 is a reinforcing bar transportation channel roller, 17 is a vertical servo motor, 18 is a horizontal servo motor, 19 is a door-shaped frame, 20 is a guide rail, 21 is a reinforcing bar driving machine, 22 is a driving roller, 23 is a reinforcing bar, 24 is a pile hole, 25 is a branch disc, 26 is a reinforcing cage, and 27 is a top expansion reinforced branch disc pile. EMBODIMENT

[0041] The application will be further described below in combination with the drawings and examples. In the description of the present application, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of the parts, and therefore cannot be understood as limiting the application. The specific dimensions used in the present embodiment are only used to illustrate the technical solutions and do not limit the protection scope of the application.

[0042] In the field of civil engineering branch pile forming technology, the commonly used extruded branch is replaced back and forth during construction, which directly increases the construction cost and construction time. At the same time, due to the size limitation of the formed pile, the horizontal and vertical bearing capacity of the pile foundation cannot be guaranteed. Therefore, the application provides a top-expanding reinforced branch pile system, which controls the size and formation of the top-expanding disc 4 through the branch top-expanding device. After the branch 25 is formed, the branch is embedded in the reinforcement cage 26 and then lowered into the pile hole 24, saving construction time and cost.

[0043] The system also includes a branch stress reinforcing bar installation device, which inserts several reinforcing bars 23 into the branch. The reinforcing bars are distributed radially along the branch, forming a top-expanding branch pile reinforcing cage. The operation of the reinforcing bars can greatly improve the horizontal and vertical bearing capacity of the pile foundation.

[0044] Next, the above-mentioned parts provided by the application will be described in detail. First, the branch top-expanding device, Figures la-b As shown, it includes a motor 8, a force transmission rod 5, an oil tank 2, a jack 1, an oil pressure pipe 6, and a pressure plate. The jacks are symmetrically distributed on both sides of the oil tank. The extension end of the jack is perpendicular to the central axis of the pile body. That is, the middle of the two jacks is the oil tank, which provides oil pressure for the jacks, and the range and stroke of the two jacks are consistent, which can be freely retracted. The pressure plate is fixed at the extension end of the jack. When the jack is started, the pressure plate is pushed out radially outward along the pile hole, and the pushing distance is 0.5-2.0 times the pile diameter. After the branch is formed, the jack is retracted to the original position. One end of the force transmission rod is vertically fixed at the center of the top of the oil tank, that is, the force transmission rod is coaxial with the pile hole. The other end of the force transmission rod is connected to the motor shaft of the motor. The motor can drive the jack to rotate through the force transmission rod. The rotation of the top-expanding disc in the same plane realizes the jacking work of the branch in different directions. The jack rotates along the same plane through the motor. The rotation distance of the jack is determined according to the design requirements. Generally, the same branch is jacked symmetrically by two jacks for 2-4 times. The top of the oil tank is also provided with a hydraulic oil passage port 3, which is connected to the oil pressure pipe.

[0045] The motor is started, the force transmission rod is rotated, and the pressure plate fixed at the extension end of the jack is rotated around the force transmission rod to form a cylindrical top-expanding disc. The thickness of the top-expanding disc is generally 5-10 cm, which is designed according to the stress of the top-expanding disc. The formation of the branch is also affected by the formation of the pressure plate. The inner side of the pressure plate facing the jack is curved, forming a rectangular or square or triangular pyramid. The application provides two preferred, Figure la flat plate type and Figure lb triangular pyramid respectively formed branch structure.

[0046] In order to ensure the stability of the top expansion disc, a plurality of support rods 7 are arranged between the inner side of the pressure plate and the jack, the plurality of support rods are distributed around the support rod circumferential wall, and each support rod forms an included angle of 45-60 degrees with the jack. Generally, 4 support rods are arranged.

[0047] When the branch disc is formed, the branch disc and the steel reinforcement cage need to be shaped before forming the top expansion branch disc pile steel reinforcement cage. In the present application, the steel reinforcement cage includes a plurality of hoop reinforcements arranged coaxially, a plurality of vertical reinforcements are fixed along the circumference of the hoop reinforcement, the vertical reinforcements are parallel to the central axis of the pile hole, and the adjacent hoop reinforcements are connected by a plurality of vertical reinforcements; the branch disc top expansion device is arranged inside the steel reinforcement cage and coaxial with the steel reinforcement cage.

[0048] In order to improve the bearing capacity of the pile body, the aforementioned top expansion branch disc pile steel reinforcement cage needs to insert the steel reinforcement into the branch disc along the radial direction of the branch disc, therefore, the present application also provides a branch disc stress steel reinforcement installation device, Figure 2 As shown, the branch disc stress steel reinforcement installation device includes a conveyor belt skeleton 9, a conveyor belt 10, a transmission gear 11, a steel reinforcement fixing gear 12, a base 13, and a steel reinforcement driving device. A steel reinforcement transportation channel 14 is opened on the surface of the base. In order to facilitate description, the center of the steel reinforcement transportation channel is defined as the origin, the central line direction is the X-axis, the direction perpendicular to the central line is the Y-axis, and the direction perpendicular to the surface of the base is the Z-axis, and a three-dimensional coordinate system is established. The conveyor belt skeletons are installed on the Y-axis on both sides of the steel reinforcement transportation channel, and the conveyor belt skeletons are parallel to the Z-axis. The end of each conveyor belt skeleton is installed with a transmission gear, and the transmission gears at both ends are connected by a conveyor belt. The steel reinforcement fixing gears are covered on the surface of the conveyor belt. The steel reinforcement fixing gears arranged oppositely on the two conveyor belt skeletons are spliced to form a transportation cavity for fixing the steel reinforcement. The inner diameter of the steel reinforcement fixing gear is equal to the outer diameter of the steel reinforcement, and the thickness of the steel reinforcement fixing gear is between 5cm and 10cm. The material of the steel reinforcement fixing gear is rubber material, which plays the role of fixing and transporting the steel reinforcement.

[0049] A steel reinforcement driving device is also erected on the steel reinforcement transportation channel. The driving force of the steel reinforcement driving device inserts the steel reinforcement transported by the conveyor belt into the branch disc. The steel reinforcement driving device includes a door-shaped frame 19, a horizontal servo motor 18, a vertical servo motor 17, a guide rail 20, and a steel reinforcement driving machine 21. On both sides of the steel reinforcement transportation channel, a guide rail is arranged parallel to the X-axis direction, and the bottom ends of the two vertical parts of the door-shaped frame are slidably connected to the guide rail. A horizontal servo motor is also arranged at the bottom end of the vertical part of the door-shaped frame. A vertical servo motor is installed on the horizontal part of the door-shaped frame, the driving shaft of the vertical servo motor is connected to the steel reinforcement driving machine, and the steel reinforcement driving machine is installed with a driving roller 22 for pressing the steel reinforcement relative to the end of the steel reinforcement transportation channel. After the steel reinforcement is sent to the steel reinforcement transportation channel, the steel reinforcement driving machine is lowered by the vertical servo motor, so that the driving roller presses the steel reinforcement and drives the steel reinforcement to move forward and backward. The steel reinforcement is inserted into the branch disc by the driving force of the steel reinforcement driving machine.

[0050] The steel bar conveying channel is generally 1 / 4-1 / 2 of the thickness of the base, and penetrates through the opposite two sides of the base surface. A plurality of steel bar conveying channel rollers 15 are arranged in the steel bar conveying channel, so as to facilitate the movement of the steel bars in the steel bar conveying channel.

[0051] Finally, the application also provides a construction process based on the top expansion reinforced branch disc pile system, Figure 3 As shown, the forming of each part includes branch disc jacking, lowering of the steel reinforcement cage, installation of the steel bars, and forming of the top expansion reinforced branch disc pile 27, and specifically includes the following steps:

[0052] Step S1: Design the steel reinforcement cage, the top expansion disc, and the jack according to the size of the pile body and the bearing requirement;

[0053] Step S2: Determine the position of the branch disc formed by the branch disc top expansion device in the steel reinforcement cage;

[0054] Step S3: Start the branch disc top expansion device, jack the pressure plate out, form the branch disc, and embed the branch disc in the steel reinforcement cage;

[0055] Step S4: Lower the steel reinforcement cage provided with the branch disc into the pile hole;

[0056] Step S5: Hoist the branch disc force steel bar installation device to each branch disc position, start the branch disc force steel bar installation device, insert the steel bars into the branch disc along the radial direction of the branch disc, and form the steel reinforcement cage of the top expansion branch disc pile;

[0057] Step S6: After the steel bars are completely installed, pour concrete into the steel reinforcement cage of the top expansion branch disc pile, form the top expansion reinforced branch disc pile, and perform the bearing capacity test or the engineering pile application.

[0058] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless otherwise defined.

[0059] The meaning of "and / or" described in the present application means that each single existence or both existences are included.

[0060] The meaning of "connection" described in the present application can be a direct connection between components or an indirect connection between components through other components.

[0061] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A top-expanded reinforced pile system, characterized in that: The device includes a support plate expansion device and a reinforcing cage. The support plate expansion device is used to form a support plate. Several support plates are embedded in the reinforcing cage. The support plate expansion device is set inside the reinforcing cage and is coaxial with the reinforcing cage. The device also includes a support plate reinforcing bar installation device, which inserts several reinforcing bars into the support plate. The reinforcing bars are distributed radially along the support plate to form a reinforcing bar skeleton for the expanded support plate pile. The expansion device includes a motor, a force transmission rod, an oil tank, jacks, hydraulic pipes, and a pressure plate. Jacks are symmetrically installed on both sides of the oil tank, with the extension / retraction direction of the jacks perpendicular to the central axis of the pile. A pressure plate is fixed to the extension / retraction end of the jacks. When the jacks are activated, the pressure plate is pushed outward radially along the pile hole. One end of the force transmission rod is vertically fixed at the center of the top of the oil tank, i.e., the force transmission rod is coaxial with the pile hole. The other end of the force transmission rod is connected to the motor shaft. A hydraulic oil passage is also provided at the top of the oil tank, which is connected to the hydraulic pipe. When the motor is activated, the force transmission rod rotates, and the pressure plate fixed to the extension / retraction end of the jack rotates around the force transmission rod to form a cylindrical expansion plate. The support plate reinforcing bar installation device includes a conveyor belt frame, a conveyor belt, transmission gears, reinforcing bar fixing gears, a base, and a reinforcing bar driving device. A reinforcing bar transport channel is formed on the base surface, with the center of the transport channel defined as the origin, its centerline direction as the X-axis, the direction perpendicular to the centerline as the Y-axis, and the direction perpendicular to the base surface as the Z-axis, establishing a three-dimensional coordinate system. Conveyor belt frames are installed on the Y-axis on both sides of the reinforcing bar transport channel, parallel to the Z-axis. A transmission gear is installed at the end of each conveyor belt frame, and the two end transmission gears are connected by the conveyor belt. Reinforcing bar fixing gears are covered on the surface of the conveyor belt, and the reinforcing bar fixing gears arranged opposite each other on the two conveyor belt frames are spliced ​​to form a transport cavity for fixing the reinforcing bars. The reinforcing bar fixing gears are made of rubber. A reinforcing bar driving device is also installed on the reinforcing bar transport channel, and the driving force of the reinforcing bar driving device inserts the reinforcing bars transported by the conveyor belt into the support plate. The rebar driving device includes a portal frame, a horizontal servo motor, a vertical servo motor, guide rails, and a rebar drive motor. A guide rail is set on both sides of the rebar transport channel, parallel to the X-axis. The bottom ends of the two vertical parts of the portal frame are slidably connected to the guide rails. A horizontal servo motor is also set at the bottom end of the vertical part of the portal frame. A vertical servo motor is installed on the horizontal part of the portal frame. The drive shaft of the vertical servo motor is connected to the rebar drive motor. A drive roller for pressing down the rebar is installed on the rebar drive motor at the end of the rebar transport channel.

2. The top-expanded reinforced pile system according to claim 1, characterized in that: Several support rods are installed between the pressure plate facing the inside of the jack and the jack. The support rods are distributed around the circumference of the jack, and each support rod forms an angle of 45-60 degrees with the jack.

3. The top-expanded reinforced pile system according to claim 1, characterized in that: The steel cage includes several coaxially arranged stirrups, and several vertical bars are fixed along the circumference of the stirrups. The vertical bars are parallel to the central axis of the pile hole, and adjacent stirrups are connected by several vertical bars.

4. The top-expanded reinforced pile system according to claim 1, characterized in that: Several steel bar transport rollers are installed in the steel bar transport channel.

5. The construction process of the top-expanded reinforced pile system according to any one of claims 1-4, characterized in that: Specifically, the following steps are included: Step S1: Design the reinforcing cage, top expansion plate, and jacks according to the pile size and bearing requirements; Step S2: Determine the position of the support plate formed by the support plate expansion device within the reinforcing cage; Step S3: Start the support plate expansion device, the jack pushes out the pressure plate to form a support plate, and embeds the support plate into the steel cage; Step S4: Lower the steel cage with the support plate into the pile hole; Step S5: Hoist the reinforcing steel bar installation device to each support plate position, start the reinforcing steel bar installation device, and insert the reinforcing steel bars into the support plate along the radial direction of the support plate to form the reinforcing steel bar skeleton of the top-expanded support plate pile; Step S6: After all the reinforcing bars are installed, pour concrete into the reinforcing bar cage of the top-expanded support pile to form the top-expanded reinforced support pile.

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