Pile foundation hole forming method

Abstract

The invention provides a pile foundation hole forming method, which belongs to the technical field of pile foundation construction, and comprises the following steps: S1, welding a pile shoe at the bottom of a pile pipe; s2, downward vertical pressure is applied to the pile pipe through vibration generated by the vibration pile sinking machine, so that the pile pipe sinks into soil; s3, when encountering a special soil layer with boulders or large friction resistance, a tamping core is hung on the upper portion in the pile pipe through lifting equipment, the tamping core is lowered in a free falling body mode, and the impact force of the tamping core is utilized for driving the pile pipe and the pile shoe to impact the special soil layer to assist in hole forming; and S4, the steel reinforcement cage is placed into the pile pipe through the hoisting device, then concrete is poured into the pile pipe, in the pouring process, the vibration pile sinking machine pulls the pile pipe while vibrating, and the pile pipe is separated from the pile shoe. The impact force generated when the ramming core freely falls is utilized to enable the pile shoe to split / jack the boulder open, the vibration pile sinking machine is matched for sinking, and therefore the purposes of assisting in hole forming, shortening the hole forming time and improving the overall construction efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of pile foundation construction, and particularly relates to a pile foundation hole forming method. Background Art

[0002] Vibration pile sinking is a method of using a vibrating pile driver to sink a pile pipe with a flap-type pile tip or pile shoe into the soil to form a hole by applying pressure to the pile pipe using the vertical directional vibration generated by the vibrating hammer and the pile pipe's own weight. The pile pipe is then vibrated and pulled out while pouring concrete, so that the concrete remains in the soil to form a pile. It is widely used in soft foundation treatment or foundation pile construction.

[0003] This technology is very suitable for areas with loose soil and simple geological conditions, and piles can be formed in about 2 hours. However, when there are boulders in the soil layer, the vibration sinking pipe is blocked by the boulders, the drilling time is greatly increased, and other technologies may even be needed to pass through the boulders. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, a pile foundation hole forming method is provided.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] This technical solution proposes a pile foundation hole forming method, comprising the following steps:

[0007] S1: Weld the pile shoe to the bottom of the pile pipe;

[0008] S2: The vibration generated by the vibrating pile driver is used to exert a downward vertical pressure on the pile pipe, so that the pile pipe sinks into the soil;

[0009] S3: When encountering isolated rocks or special soil layers with large friction resistance, the tamping core is hung on the top of the pile pipe through the lifting equipment, and the tamping core is lowered in a free fall manner. The impact force of the tamping core is used to drive the pile pipe and pile shoe to impact the special soil layer to assist in hole formation;

[0010] S4: Use a lifting device to place the steel cage into the pile pipe, and then pour concrete into the pile pipe. During the pouring process, the vibrating pile driver pulls up the pile pipe while vibrating, and separates the pile pipe from the pile shoe.

[0011] Preferably, the pile pipe is of hollow structure, a through hole is provided in the vibratory pile driver and is arranged concentrically with the pile pipe, the through hole is used for the ramming core and the steel cage to pass through, a feed port is provided on the upper part of the pile pipe, and a feed hopper is fixedly welded around the feed port.

[0012] Preferably, in S4, after the pile pipe is sunk into the soil at the designed position, at this time, the feed hopper is slightly higher than the soil surface, and the output end of the concrete mixer truck is moved to above the feed hopper, so that concrete can be poured into the pile pipe; as the pile pipe is pulled out, the feed hopper is located at a high position, and the concrete in the concrete mixer truck is poured into the lifting container, and the lifting container is lifted and aligned to the feed hopper by the lifting equipment, and the concrete is filled into the feed port into the interior of the pile pipe.

[0013] Preferably, the lifting container includes a container body, a discharge channel is provided on one side of the container body, a feed port is provided on the top of the container body, slide grooves are provided on both sides of the discharge channel, a baffle is provided in the discharge channel, and limiting plates are respectively provided on both sides of the baffle, the two limiting plates respectively pass through the two slide grooves and extend to the outside of the slide groove, and an auxiliary pull rope is also connected to the container body.

[0014] Preferably, the lifting device is detachably connected to the rear half of the lifting container, so that the discharge channel is tilted downward after the lifting container is suspended in the air, and the auxiliary pull rope is manually pulled to cooperate with the lifting device to align the discharge channel and insert it into the feed hopper. During the lowering process, the feed hopper pushes the two limit plates and the baffle plate upward to open the discharge channel, and the concrete is further filled into the pile pipe through the feed port.

[0015] Preferably, in S3, during the process of the tamping core being lifted, the concrete dry mix is ​​filled into the hopper.

[0016] Preferably, the lifting equipment includes a double-drum winch, and the two drums in the double-drum winch are respectively wound with a first lifting rope and a second lifting rope, the first lifting rope is connected to the ramming core, and the second lifting rope is detachably connected to the steel cage or the lifting container.

[0017] Preferably, the pile shoe consists of an upper settlement head and a lower impact head. The upper settlement head and the lower impact head are in close contact and have a triangular vertical cross-section. The top of the upper settlement head has a limiting edge which is sleeved on the bottom of the pile pipe and welded to the pile pipe. A connecting column is fixed on the upper settlement head, and the connecting column can freely pass through the center of the upper settlement head. After the connecting column passes through the upper settlement head, an impact plate is fixed.

[0018] Preferably, the tamping core is a solid steel cylinder, the diameter of the tamping core is 20 cm smaller than the inner diameter of the pile pipe, and the weight is 8 tons.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The present invention adopts tamping core to assist in hole drilling. When encountering obstacles such as hard soil layer or isolated rocks, the impact force generated by the free fall of the tamping core is used to make the pile shoe split / push the isolated rocks, and cooperate with the vibrating pile driver to sink, thereby achieving the purpose of assisting hole drilling, shortening the drilling time and improving the overall construction efficiency.

[0021] 2. The present invention utilizes a lifting device in conjunction with a lifting container to add slurry into a feed hopper at a high position, lifts the hopper through the lifting device, cooperates with a baffle to reduce slurry leakage during the lifting process, and manually pulls an auxiliary pull rope to control the position of the lifting container so that the lifting container is stuck in the feed hopper. This method is convenient and quick, and solves the pain point that the feed hopper is located at a high position and it is inconvenient to pour concrete into the pile pipe.

[0022] 3. The pile shoe in the present invention is composed of an upper settlement head and a lower impact head. After the tamping core falls freely, a downward force is applied to the lower impact head, thereby forming an impact point on the boulder, achieving the effect of breaking the surface with a point, destroying the overall strength of the boulder, and cooperating with the downward force of the upper settlement head and the vibrating pile driver. The combination of the three can maximize the impact force of the tamping core, improve the destruction efficiency, and accelerate the hole-making time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a schematic diagram of the layout of step one in the present invention.

[0025] Figure 2 It is a schematic diagram of the layout of step two and step three in the present invention.

[0026] Figure 3 It is a schematic diagram of the layout of placing a reinforcement cage into a pile pipe in the present invention.

[0027] Figure 4 It is a schematic diagram of the layout of pouring concrete in the pile pipe in the present invention.

[0028] Figure 5 It is a schematic diagram of the layout of pouring concrete after the pile pipe is in a high position in the present invention.

[0029] Figure 6 It is a three-dimensional structural schematic diagram of the pile pipe, pile shoe and vibrating pile driver in the present invention.

[0030] Figure 7 It is a three-dimensional structural schematic diagram of the lifting container and the pile pipe in the present invention.

[0031] Figure 8 It is a schematic structural diagram of the pile shoe in two states in the present invention.

[0032] 1. Vibratory pile driver; 2. Pile pipe; 21. Feed port; 22. Feed hopper; 3. Pile shoe; 31. Upper settlement head; 32. Lower impact head; 33. Connecting column; 34. Impact plate; 4. Ramming core; 5. Lifting equipment; 51. Double-drum winch; 52. First lifting rope; 53. Second lifting rope; 6. Concrete mixer truck; 7. Lifting container; 71. Container body; 72. Discharge channel; 73. Feed port; 74. Chute; 75. Baffle; 76. Limit plate; 77. Auxiliary pull rope; 8. Steel cage. DETAILED DESCRIPTION

[0033] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In addition, terms such as "long", "short", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific direction or operate with a specific direction structure, and should not be understood as a limitation of the present invention.

[0035] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings.

[0036] like Figure 1-8 As shown, this embodiment proposes a pile foundation hole forming method, comprising the following steps:

[0037] S1: Weld the pile shoe 3 to the bottom of the pile pipe 2. Preferably, the pile shoe 3 is connected to the bottom of the pile pipe 2 by electric welding, so that the pile shoe 3 and the pile pipe 2 can be separated after the ramming core 5 impacts multiple times.

[0038] S2: using the vibration generated by the vibrating pile driver 1 to apply a downward vertical pressure to the pile pipe 2, so that the pile pipe 2 sinks into the soil;

[0039] S3: When encountering isolated rocks or special soil layers with large friction resistance, the tamping core 4 is hung on the top of the pile pipe 2 by the lifting equipment 5, and the tamping core 4 is lowered in a free fall manner, and the impact force of the tamping core 4 is used to drive the pile pipe 2 and the pile shoe 3 to impact the special soil layer to assist in hole forming;

[0040] S4: Use a lifting device to place the steel cage 8 into the pile pipe 2, and then pour concrete in the pile pipe 2. During the pouring process, the vibrating pile driver 1 pulls out the pile pipe 2 while vibrating, and separates the pile pipe 2 from the pile shoe 3. Specifically, after the pile shoe 3 is impacted by the rammer core 4 several times, the pile shoe 3 and the pile pipe 2 are already in a separated state. Since the vibrating pile driver 1 applies downward pressure to the pile pipe 2, the bottom of the pile pipe 2 is tightly attached to the upper surface of the pile shoe 3 until the pile pipe 2 is pulled out, and the pile shoe 3 is completely separated from the pile pipe 2.

[0041] The traditional pipe sinking method is only suitable for areas with loose soil and simple geological conditions, and piles can be formed in about 2 hours. However, when there are boulders in the soil layer, the vibration pipe sinking is blocked by the boulders, the drilling time is greatly increased, and even other processes need to be used to penetrate the boulders. Therefore, the above-mentioned tamping core 4 is used to assist in drilling, and the impact force generated by the free fall of the tamping core 4 is used to make the pile shoe 3 split / push the boulders, and the pile pipe 2 sinks accordingly, thereby achieving the purpose of assisting drilling, shortening the drilling time, and improving the overall construction efficiency.

[0042] In some embodiments, the pile pipe 2 is a hollow structure, and a through hole is provided in the vibratory pile driver 1 concentrically arranged with the pile pipe 2. The through hole is used for the ramming core 4 and the steel cage 8 to pass through. A feed port 21 is opened on the upper part of the pile pipe 2, and a feed hopper 22 is fixedly welded around the feed port 21. After the pile pipe 2 sinks to the designed position, the concrete slurry enters the interior of the pile pipe 2 through the feed port 21, thereby facilitating grouting in the pile pipe 2.

[0043] Further, in S4, after the pile pipe 2 is sunk into the soil at the designed position; at this time, the position of the feed hopper 22 is slightly higher than the soil surface, and the output end of the concrete mixer 5 is moved to the top of the feed hopper 22, so that concrete can be poured into the pile pipe 2; as the pile pipe 2 is pulled out, the feed hopper 22 is now located at a high position above the soil surface, and the concrete in the concrete mixer 5 is poured into the lifting container 7, and the lifting container 7 is lifted and aligned to the feed hopper 22 by the lifting device 5, and the concrete is filled into the pile pipe 2 at the feed port 21. When the pile pipe 2 is pulled out to a certain height, it is difficult to continue to fill the pile pipe 2 with concrete through the concrete mixer 5, so the lifting container 7 is used as an intermediate receiving part, and the cement of the concrete mixer 5 is poured into the lifting container 7, and then the concrete in the lifting container 7 is poured into the feed hopper 22 at a high position. This method is convenient and quick, and solves the pain point that the feed hopper 22 is located at a high position and it is inconvenient to pour concrete into the pile pipe 2.

[0044] In some embodiments, the lifting device 5 includes a double-drum hoist 51, and the two drums in the double-drum hoist 51 are respectively wound with a first lifting rope 52 and a second lifting rope 53, the first lifting rope 52 is connected to the tamping core 4, and the second lifting rope 53 is detachably connected to the steel cage 8 or the lifting container 7. The double-drum hoist 51 can save a certain amount of space and facilitate the control of the two lifting ropes. The first lifting rope 52 is used to drive the tamping core 4 to move, and the second lifting rope 53 is first used to place the steel cage 8, and then connected to the lifting container 7 to lift it to a high place for grouting.

[0045] Furthermore, in the present embodiment, the lifting container 7 includes a container body 71, a discharge channel 72 is provided on one side of the container body 71, a feed port 73 is provided above the container body 71, slide grooves 74 are provided on both sides of the discharge channel 72, a baffle 75 is provided in the discharge channel 72, and limiting plates 76 are respectively provided on both sides of the baffle 75, the two limiting plates 76 respectively pass through the two slide grooves 74 and extend to the outside of the slide groove 74, and an auxiliary pull rope 77 is also connected to the container body 71.

[0046] refer to Figure 7 The lifting device 5 is detachably connected to the rear half of the lifting container 7. After the lifting container 7 is suspended by the lifting device 5, the discharge channel 72 is tilted downward. The auxiliary pull rope 77 is manually pulled, and the discharge channel 72 is aligned with the lifting device 5 and inserted into the feed hopper. During the lowering process, the feed hopper pushes the two limit plates 76 and the baffle 75 upward to open the discharge channel 72, and the concrete is further filled into the pile pipe 2 through the feed port 21. When the lifting container 7 is moved upward, it is difficult to keep the lifting container 7 moving in a stable state. If it tilts, the internal concrete slurry will leak out. Therefore, a baffle 75 and a limit plate 76 are designed. The baffle 75 temporarily closes the discharge channel 72, so that the lifting container 7 can be suspended in an inclined state. The inclined lifting container 7 is more convenient to dock with the feed hopper 22. The lifting rope container is controlled to rise by the second lifting rope 53, and the auxiliary pull rope 77 is manually pulled to control the docking position. During the docking process between the discharge channel 72 and the feed hopper 22, the feed hopper 22 pushes the baffle 75 upward through the limit plate 76, thereby opening the discharge channel 72 to allow concrete to enter the pile pipe 2. With this design, it is more convenient to grout the feed hopper 22 at a high position, and it can also save a certain amount of cost.

[0047] In some embodiments, during the lifting of the ram core 4, dry concrete can be filled in the hopper 22. The dry concrete is filled between the ram core and the pile shoe to play a certain buffering role, thereby preventing the ram core 4 from directly impacting the pile shoe 3 and causing excessive wear.

[0048] In some embodiments, the ramming core 4 is a solid steel cylinder, the diameter of the ramming core 4 is 20 cm smaller than the inner diameter of the pile pipe 2, and the weight is 8 tons.

[0049] like Figure 8 As shown, in some embodiments, the pile shoe 3 is composed of an upper settlement head 31 and a lower impact head 32. The upper settlement head 31 and the lower impact head 32 are in close contact with each other and the vertical cross-section is triangular. The top of the upper settlement head 31 has a limiting edge which is sleeved on the bottom of the pile pipe 2 and welded to the pile pipe 2. A connecting column 33 is fixed on the upper settlement head 31. The connecting column 33 can freely pass through the center of the upper settlement head 31. After the connecting column 33 passes through the upper settlement head 31, an impact plate 34 is fixed.

[0050] In this design, the impact force of the tamping core 4 is further utilized to form a point-to-point surface break, which has a stronger impact effect; during the free fall of the pile shoe 3, it first contacts the impact plate 34, driving the impact plate 34 to move downward, and the impact plate 34 further drives the sinking head to impact the boulder, thereby forming an impact point, destroying the overall strength of the boulder, and then the tamping core 4 further drives the impact plate 34 to cling to the upper sinking head 31, and the upper sinking head 31 and the lower impact head 32 go deeper downward to further destroy the boulder; cooperate with the vibrating pile driver 1 to apply downward pressure to the pile pipe 2, driving the pile shoe 3 to destroy the boulder. The combination of the three maximizes the impact force of the tamping core 4, improves the destruction efficiency, and speeds up the hole-making time.

[0051] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A pile foundation hole forming method, characterized in that: The steps include: S1: Weld the pile shoe to the bottom of the pile pipe; S2: The vibration generated by the vibrating pile driver is used to exert a downward vertical pressure on the pile pipe, so that the pile pipe sinks into the soil; S3: When encountering isolated rocks or special soil layers with large friction resistance, the tamping core is hung on the top of the pile pipe through the lifting equipment, and the tamping core is lowered in a free fall manner. The impact force of the tamping core is used to drive the pile pipe and pile shoe to impact the special soil layer to assist in hole formation; S4: Use a lifting device to place the steel cage into the pile pipe, and then pour concrete into the pile pipe. During the pouring process, the vibrating pile driver pulls up the pile pipe while vibrating, and separates the pile pipe from the pile shoe.

2. A pile foundation hole forming method according to claim 1, characterized in that: The pile pipe is of hollow structure, a through hole is arranged in the vibrating pile driver concentrically with the pile pipe, the through hole is used for the ramming core and the steel cage to pass through, a feed port is opened on the upper part of the pile pipe, and a feed hopper is fixedly welded around the feed port.

3. A pile foundation hole forming method according to claim 2, characterized in that: In S4, after the pile pipe is sunk into the designed position in the soil, the feed hopper is slightly higher than the soil surface. The output end of the concrete mixer truck is moved above the feed hopper, and concrete can be poured into the pile pipe. As the pile pipe is pulled out, the feed hopper is located at a high position, and the concrete in the concrete mixer truck is poured into the lifting container. The lifting container is lifted and aligned to the feed hopper by the lifting equipment, and the concrete is filled into the feed port into the pile pipe.

4. A pile foundation hole forming method according to claim 3, characterized in that: The lifting container includes a container body, a discharge channel is provided on one side of the container body, a feed port is provided on the top of the container body, slide grooves are provided on both sides of the discharge channel, a baffle is provided in the discharge channel, and limit plates are provided on both sides of the baffle, the two limit plates respectively pass through the two slide grooves and extend to the outside of the slide grooves, and an auxiliary pull rope is also connected to the container body.

5. A pile foundation hole forming method according to claim 4, characterized in that: The lifting device is detachably connected to the rear half of the lifting container, so that the discharge channel is tilted downward after the lifting container is suspended in the air. The auxiliary pull rope is manually pulled, and the lifting device is cooperated to align the discharge channel and insert it into the feed hopper. During the lowering process, the feed hopper pushes the two limit plates and the baffle plate upward to open the discharge channel, and the concrete is further filled into the pile pipe through the feed port.

6. A pile foundation hole forming method according to claim 1, characterized in that: In S3, during the lifting of the tamping core, the dry concrete mix is ​​filled into the hopper.

7. A pile foundation hole forming method according to claim 3, characterized in that: The lifting equipment includes a double-drum winch, and a first lifting rope and a second lifting rope are respectively wound on two drums of the double-drum winch. The first lifting rope is connected to the ramming core, and the second lifting rope is detachably connected to the steel cage or the lifting container.

8. A pile foundation hole forming method according to claim 1, characterized in that: The pile shoe consists of an upper settlement head and a lower impact head. The upper settlement head and the lower impact head are in close contact with each other and have a triangular vertical cross-section. The top of the upper settlement head has a limiting edge which is sleeved on the bottom of the pile pipe and welded to the pile pipe. A connecting column is fixed on the upper settlement head, and the connecting column can freely pass through the center of the upper settlement head. An impact plate is fixed after the connecting column passes through the upper settlement head.

9. A pile foundation hole forming method according to claim 1, characterized in that: The tamping core is a steel solid cylinder, the diameter of the tamping core is 20 cm smaller than the inner diameter of the pile pipe, and the weight is 8 tons.

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