CN113026746A - Static pile press for hole guiding and digging and construction method thereof - Google Patents
Static pile press for hole guiding and digging and construction method thereof Download PDFInfo
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- CN113026746A CN113026746A CN202110308237.6A CN202110308237A CN113026746A CN 113026746 A CN113026746 A CN 113026746A CN 202110308237 A CN202110308237 A CN 202110308237A CN 113026746 A CN113026746 A CN 113026746A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/20—Placing by pressure or pulling power
Abstract
The invention discloses a construction method for digging a static pile press in a pilot hole, which comprises the following steps: 1. the method comprises the steps of placing a pile machine in place, 2, installing a pipe pile, 3, hydraulically sending the pile in a soft soil layer on the top layer, 4, installing a drill bit and a drill rod, 5, digging and sending the pile in a guide hole of a holding hard soil layer, 6, reaming the holding hard soil layer, 7, pouring the pile bottom, and 8, finishing the pile foundation. The invention also discloses a static pile press for digging in the pilot hole for implementing the method. According to the synchronous improved equipment and the construction process, the foundation soil layers under and on the side parts of the tubular pile are excavated and drilled by combining the bottom expanding drill bit and the spiral drill rod, so that the diameter of the drilled hole is larger than the diameter of the pile, hole leading, middle digging and pile pressing are synchronously performed, the construction efficiency and the construction quality are greatly improved, and the construction cost is reduced; the static pile press for digging in the pilot hole can overcome the defect that the pile is difficult to pass through a hard sand layer, so that a pile sinking foundation can smoothly reach a designed bearing layer, the stratum adaptability of equipment is improved, and the design requirement of pile foundation engineering can be met.
Description
Technical Field
The invention relates to the technical field of static pile pressing machines and pile pressing construction, in particular to a static pile pressing machine for hole guiding and digging and a construction method thereof.
Background
The static pressure pile sinking method is a pile sinking process for pressing a tubular pile into the soil by providing counter force through the self weight of a static pile press and a counter weight on a frame. The process has the advantages of no vibration, no impact, no noise and the like; meanwhile, the high-strength prestressed precast tubular pile is selected for the pile body, and the pile foundation has the characteristics of simple process, reliable quality, low manufacturing cost and convenience in detection. However, when the static pile driver encounters a thick hard sand layer in the pile driving process, construction is difficult due to increased resistance, which is also an important reason for restricting the stratum adaptability of the static pile driver.
Several solutions exist:
1. and (4) leading holes before pile pressing, drilling holes at the well-determined pile positions, wherein the diameter of the drilled holes is smaller than the diameter of the pile so as to reduce pile pressing resistance. However, this construction method takes a long time and increases the construction cost. The hole collapse is easy, and the pile press is difficult to align the hole position.
2. Under the condition that pile sinking can not be continued by means of static pressure, a hammering mode is adopted, the hard sand layer is penetrated by means of impact on the hard sand layer, but the method has large damage to the prefabricated pipe pile, the pile body can be damaged, noise is high, and oil stains splash to pollute the environment.
In the prior art, a penetration static pressure construction process with application number CN201810430765.7 in a pipe is used for static pressure pile sinking of a PHC pipe pile, and comprises the following steps: (1) in the process of static-pressure pile sinking of the PHC pipe pile, a drill rod is firstly placed into a cavity on the inner wall of the PHC pipe pile; (2) starting static pressure sinking of the PHC pipe pile; (3) when the PHC tubular pile can not sink under the maximum pressure of the static pile machine, opening a power device of the hole leading pile machine to drive a drill rod to lead holes of the foundation; (4) when the depth of the guide hole reaches 0.5m to 7.0m, lifting the drill rod upwards by 0.5m to 6.0m, and then performing static pressure sinking on the PHC tubular pile; (5) and (5) repeatedly and alternately performing the steps (3) and (4) until the PHC tubular pile is sunk to the designed elevation, and completing the static pressure pile sinking of the PHC tubular pile. According to the invention, the drill rod can only drill the soil in the cavity of the inner wall of the tubular pile and the soil right below the cavity, but can not drill the soil at the side edge of the foundation below the tubular pile wall, and the drill hole diameter is smaller than the pile diameter, so that when the tubular pile passes through a hard sand layer and a hard stone layer, static pressure pile sinking is still difficult or can not pass through, and the engineering design requirement can not be met; the construction method and the equipment have the advantages that the hole guiding and the pile pressing are alternately operated, the alternate operation is complex, the consumed time is long, the energy consumption is high, the construction progress is influenced, and the construction cost is increased.
Disclosure of Invention
The invention aims to overcome the defects and provide a static pile press for hole guiding and digging and a construction method thereof, which lead the hole and the pile press to be synchronously operated without alternation, greatly simplify the operation steps and shorten the operation time by synchronously improving the construction method and the construction equipment; the foundation soil layer under and on the side part of the tubular pile is dug, broken and drilled by combining the bottom expanding drill bit and the spiral drill rod, so that the diameter of a drilled hole is larger than the diameter of the tubular pile, the tubular pile conveniently passes through a bearing layer comprising a hard sand layer and a hard stone layer smoothly, and the static pressure pile sinking is carried out, thereby greatly improving the construction efficiency and reducing the construction cost; the static pile driver for digging in the guide hole is subjected to large-width mechanism optimization design by matching with a construction process, so that the guide hole and pile driving operation are carried out synchronously, the static pile driver is convenient to operate, short in time consumption and low in energy consumption, stratum adaptability of pile driving equipment is greatly improved, and engineering design requirements can be better met.
The technical scheme is as follows:
a construction method for digging a static pile press in a pilot hole comprises the following steps:
(1) the static pile pressing machine is arranged in a guide hole and comprises a static pile pressing machine, a guide hole drill rod, a spiral drill rod, a bottom expanding drill bit, a drill rod winch and a fluid conveying pipe, wherein the bottom expanding drill bit comprises a bottom expanding digging cutter and a cement releasing port, the guide hole drill rod, the spiral drill rod and the bottom expanding drill bit are respectively hollow, and the fluid conveying pipe sequentially penetrates through the guide hole drill rod, the spiral drill rod and the bottom expanding drill bit and is communicated with the cement releasing port;
(2) the pipe pile installation, namely hoisting the pipe pile to be pressed to the hydraulic pile pressing mechanism by using a hoisting mechanism, and enabling the bottom of the pipe pile to be pressed to be in contact with the top of the center of the pile foundation to be constructed;
(3) the hydraulic pile pressing mechanism is utilized to press the pipe pile to be pressed into the top soft soil layer of the foundation soil layer; wherein the foundation soil layer comprises a top soft soil layer and a holding hard soil layer;
(4) installing a drill bit and a drill rod, namely installing a bottom expanding drill bit and a spiral drill rod at the lower end of a guide hole drill rod and inserting the bottom expanding drill bit and the spiral drill rod into a pressure pipe pile to be sent;
(5) the pile is dug and sent in the guide hole of the holding hard soil layer, a spiral drill rod in the tubular pile and a bottom expanding drill bit are rotated at low speed to discharge soil in the tubular pile, and the spiral drill rod and the bottom expanding drill bit descend along with the tubular pile under the control of a drill rod winch; when the hydraulic pile pressing mechanism presses the pipe pile to the vicinity of the holding hard soil layer and the pile pressing force of the hydraulic pile pressing mechanism cannot enable the pipe pile to sink continuously, the bottom expanding drill bit descends and goes out and expands the bottom expanding digging cutter, so that the foundation soil layer under and at the side part of the pipe pile is dug, and the hydraulic pile pressing mechanism is matched to press the pipe pile into the holding hard soil layer;
(6) expanding the hole in the hard soil layer, and when the tubular pile reaches the position near the specified depth, expanding the bottom-expanding digging cutter to the maximum angle by using the bottom-expanding drill bit, continuously digging downwards, and forming an expanded hole;
(7) pouring the pile bottom, wherein one end of the fluid conveying pipe is communicated with a cement pump station, the other end of the fluid conveying pipe injects cement into the enlarged hole by utilizing a cement releasing port of the bottom expanding drill bit, and the auger stem drives the bottom expanding drill bit to rotate at a low speed so as to fully stir the cement; cement is filled in the enlarged holes, and the enlarged pile heads of the tubular piles are formed;
(8) and after the pile foundation is finished, the bottom expanding digging cutter is folded by the bottom expanding drill bit, and the spiral drill rod and the bottom expanding drill bit are lifted by the drill rod winch to prepare for the next round of operation.
The static pile driver for digging in the pilot hole further comprises a down-the-hole hammer, and the step (5) further comprises the following steps:
(51) if, if expand end drill bit excavation holding power layer's stereoplasm soil or during the hard stone difficulty, use down the hole hammer replacement expand end drill bit, smash, dig the stereoplasm sand bed or the hard stone layer in the foundation soil layer of tubular pile below, then cooperate hydraulic pressure pile pressing mechanism to impress the tubular pile holding power layer.
A static pile driver for digging in pilot hole for implementing the construction method comprises a static pile driver, a support frame, a stand column, a jacking oil cylinder, a drill rod power head, a pilot hole drill rod, a spiral drill rod, a bottom expanding drill bit, a guide frame, a drill rod hoist and a suspension steel wire rope, wherein the static pile driver comprises a hydraulic pile pressing mechanism, a hoisting mechanism and a host platform, the hydraulic pile pressing mechanism, the hoisting mechanism, the support frame and the drill rod hoist are respectively arranged on the host platform, the hoisting mechanism and the support frame are respectively positioned at two sides of the hydraulic pile pressing mechanism, the stand column is vertically and slidably connected with the support frame through the jacking oil cylinder, the drill rod power head is arranged on the stand column, the guide frame is vertically and slidably connected with the stand column, the lower end of the pilot hole drill rod penetrates through the drill rod power head and is rotatably connected with the drill rod power head, the upper end of the, the bottom expanding drill bit is connected with the lower end of the hole guiding drill rod through the spiral drill rod, one end of the hanging steel wire rope is connected with the upper end of the hole guiding drill rod, and the other end of the hanging steel wire rope is wound on the drill rod winch.
The hydraulic driving device is installed in the drill bit containing cavity and is in driving connection with the two bottom-expanding digging knives, one end of the hydraulic driving pipe penetrates through the drill rod containing cavity, the drill bit containing cavity and the hydraulic driving device in sequence, the other end of the hydraulic driving pipe is wound on the first pipe storage turntable and is communicated with the hydraulic oil input port, and one end of the fluid conveying pipe penetrates through the drill rod containing cavity and the hydraulic driving device in sequence, The drill bit containing cavity is communicated with the cement releasing port, and the other end of the fluid conveying pipe is wound on the second storage pipe rotary table and is communicated with the cement input port.
The bottom expanding drill bit further comprises two transmission gears, a first transmission through hole and a second transmission through hole are respectively formed in the side walls of the two sides of the middle of the drill bit accommodating cavity, the cement release port is formed in the side wall of the lower end of the drill bit accommodating cavity, a cutter head is arranged at one end of the bottom expanding digging cutter, digging cutter teeth are arranged at the other end of the bottom expanding digging cutter, and the two bottom expanding digging cutters are respectively installed on the first transmission through hole and the outer side face of the second transmission through hole through one ends of the digging cutter teeth and are rotatably connected with the outer side face of the drill bit main body; the two transmission gears are respectively arranged in the first transmission through hole and the second transmission through hole and are respectively meshed with the two digging cutter teeth, and the hydraulic driving device is in driving connection with the two transmission gears.
The bottom expanding drill bit further comprises a lower spacer bush, the hydraulic driving device comprises a hydraulic oil cylinder, a telescopic rod and two racks, the lower spacer bush is installed in the middle of the drill bit containing cavity, a rotary through hole is formed in the middle of the lower spacer bush, the hydraulic oil cylinder is installed at the upper end of the drill bit containing cavity, the upper end of the telescopic rod is in telescopic connection with the hydraulic oil cylinder, the lower end of the telescopic rod penetrates through the rotary through hole and is in rotary connection with the lower spacer bush, and the two racks are installed on two sides of the middle of the telescopic rod respectively and are in meshed connection with the two transmission gears respectively.
The supporting frame comprises a supporting arm, a supporting bearing frame and a telescopic variable amplitude oil cylinder, the supporting bearing frame is installed on the host platform, the lower ends of the supporting arm and the telescopic variable amplitude oil cylinder are respectively hinged with the top surface of the supporting bearing frame, the upper end of the telescopic variable amplitude oil cylinder is hinged with the upper end of the supporting arm, and the stand column is connected with the supporting arm in a vertical sliding mode through the jacking oil cylinder.
The spiral drill pipe hoisting device is characterized by further comprising a first guide wheel and a second guide wheel, wherein the first guide wheel and the second guide wheel are respectively installed at the top end of the stand column, the drill pipe hoisting machine is installed on the supporting bearing platform, one end of the hanging steel wire rope is connected with the upper end of the spiral drill pipe, and the other end of the hanging steel wire rope is wound on the drill pipe hoisting machine after being turned by the first guide wheel and the second guide wheel.
The guiding hole drill rod comprises a drill rod layer, a drill rod layer and a drill rod layer, wherein the drill rod layer, the drill rod layer and the drill rod layer are hollow respectively, the drill rod layer and the drill rod layer are sequentially sleeved with the inner layer to form telescopic connection, the upper end of the drill rod layer is connected with the guide frame in a rotating mode, the lower end of the drill rod layer penetrates through the drill rod power head and is connected with the drill rod in a rotating mode, and the lower end of the drill rod layer is connected with the spiral drill.
The down-the-hole hammer replaces the bottom expanding drill bit and is arranged at the lower end of the spiral drill rod.
It should be noted that:
the foregoing references to "first and second …" do not denote any particular quantity or order, but rather are used to distinguish one name from another.
In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The following illustrates the advantages or principles of the invention:
1. according to the static pile press for hole guiding and middle digging and the construction method thereof, provided by the invention, through synchronous improvement of the construction method and construction equipment, hole guiding, middle digging and pile press operation can be synchronously carried out without alternation, the operation steps are greatly simplified, the operation time is shortened, and energy is saved; the foundation soil layer under the tubular pile and at the side part is dug, broken and drilled by combining a bottom expanding drill bit (or a down-the-hole hammer) and a spiral drill rod, so that the diameter of the drilled hole is larger than the diameter of the pile, the tubular pile conveniently passes through a holding layer comprising a hard sand layer and a hard stone layer smoothly, and the static pressure pile sinking is carried out, the construction efficiency is greatly improved, the time is shortened, the construction cost is reduced, and the pile sinking construction quality is improved; the static pile driver for digging in the guide hole is subjected to large-width mechanism optimization design by matching with a construction process, so that the guide hole and pile driving operation are synchronously performed, the operation is convenient and fast, and the stratum adaptability of pile driving equipment is improved. The pile press provided by the invention has the advantages of the traditional static pressure pile press, also increases the stratum adaptability of pile press equipment, overcomes the defect that the static pressure pile press is difficult to penetrate through a thicker hard sand layer and a hard stone layer, can enable a pile sinking foundation to smoothly reach a designed supporting layer, better meets the design requirement of pile foundation engineering, and obtains the pile foundation supporting force superior to the engineering design requirement.
2. The construction method for digging the static pile press in the pilot hole provided by the invention comprises the steps that firstly, a pile driver is put in place, the static pile press digging in the pilot hole is moved to a to-be-constructed area, then a pipe pile is installed, a pipe pile to be pressed is hoisted to a hydraulic pile press mechanism by utilizing a hoisting mechanism, the pipe pile to be pressed is pressed into a top soft soil layer of a foundation soil layer by utilizing the hydraulic pile press mechanism, then a bottom expanding drill bit and a spiral drill rod are installed at the lower end of a drill rod of the pilot hole and are inserted into the pipe pile to be pressed; the spiral drill rod and the bottom expanding drill bit in the tubular pile are rotated at low speed to discharge soil in the tubular pile and descend along with the tubular pile under the control of a drill rod winch; when the hydraulic pile pressing mechanism presses the pipe pile to the vicinity of the holding hard soil layer and the pile pressing force of the hydraulic pile pressing mechanism cannot enable the pipe pile to continuously sink, the bottom expanding drill bit descends and advances out, the bottom expanding digging cutter is unfolded, the foundation soil layer below the pipe pile is dug, and the hydraulic pile pressing mechanism is matched to press the pipe pile into the holding hard soil layer; when the tubular pile reaches the position near the designated depth, the bottom-expanding drill bit expands the bottom-expanding digging cutter to the maximum angle to continue digging downwards, and a hole is expanded for forming; finally, the pipe pile is communicated with a cement pump station through a fluid conveying pipe, cement conveyed by the cement pump station is injected into the enlarged hole through a cement release port of the bottom expanding drill bit, and after the enlarged hole is filled with the cement, the pipe pile enlarged pile head is formed; and (5) completing the pile foundation and preparing for the next round of operation. The construction method utilizes construction equipment combining static pressure and hole leading and digging, utilizes a combination of a bottom expanding drill bit and a spiral drill rod to dig and drill a foundation soil layer below the tubular pile, realizes that the diameter of a drilled hole is larger than the diameter of the pile, facilitates the static pressure pile sinking of the tubular pile on a bearing layer, and leads, middle digging and pile pressing operation to be synchronously carried out, greatly improves the construction efficiency, reduces the construction cost, overcomes the defect that a static pressure pile machine is difficult to penetrate through hard soil layers such as a thick hard sand layer, ensures that a pile sinking foundation smoothly reaches the designed bearing layer, meets more pile foundation engineering design requirements, and obtains the pile foundation bearing force superior to the engineering design requirements.
3. The construction method of the invention also comprises a down-the-hole hammer, if the bottom-expanding drill bit is difficult to excavate a bearing hard soil layer, a hard sand layer, a hard stone layer and the like, the bottom-expanding drill bit is replaced by the down-the-hole hammer, in addition, an external air compressor of the fluid conveying pipe can be used for being connected with the down-the-hole hammer, and the high-pressure air generated by the down-the-hole hammer drives the down-the-hole hammer, thereby simplifying the power structure design; meanwhile, the bottom expanding drill bit can be replaced by other pneumatic tool heads to meet different operation requirements so as to dig the foundation soil layer below the tubular pile.
4. The invention provides a static pile driver for guiding holes and digging in the construction method, which comprises a static pile driver, a support frame, an upright post, a jacking oil cylinder, a drill rod power head, a hole guiding drill rod, a spiral drill rod, a bottom expanding drill bit, a guide frame, a drill rod winch and a hanging steel wire rope, the static pile driver for digging in the pilot hole utilizes the combination of the bottom expanding drill bit and the spiral drill rod to dig and drill the foundation soil layer below the tubular pile, realizes that the diameter of the drilled hole is larger than the diameter of the pile, facilitates the static pressure pile sinking of the tubular pile on the bearing layer, adopts the construction method of combining the static pressure pile sinking with the hole digging, not only has the advantages of the traditional static pile driver, but also increases the stratum adaptability of pile pressing equipment, overcomes the defect that the static pile driver is difficult to penetrate through a thicker hard sand layer, ensures that the pile sinking foundation smoothly reaches the designed bearing layer, better meets the design requirement of pile foundation engineering, and obtains the pile foundation bearing force superior to the engineering design requirement.
5. The static pile driver for hole leading also comprises a hydraulic driving pipe, a fluid conveying pipe, a first pipe storage turntable and a second pipe storage turntable, wherein one end of the hydraulic driving pipe is communicated with a hydraulic driving device, the other end of the hydraulic driving pipe is wound on the first pipe storage turntable, the hydraulic driving pipe is convenient to store, and is communicated with a hydraulic oil input port, the hydraulic oil input port is communicated with an external hydraulic oil pump station so as to provide hydraulic driving power for the hydraulic driving device, one end of the fluid conveying pipe is communicated with a cement releasing port of the bottom expanding drill bit, the other end of the fluid conveying pipe is wound on the second pipe storage turntable so as to be convenient to store the fluid conveying pipe and is communicated with the cement input port, and the cement input port is communicated with the external cement pump station so as to inject cement provided by the cement pump station into an expanding pile head of the tubular pile through the cement releasing port.
6. When the bottom expanding drill bit is used, the hydraulic driving device drives the two transmission gears to rotate, the transmission gears drive the digging cutter teeth, and the digging cutter teeth drive the bottom expanding digging cutter to open.
7. The hydraulic driving device comprises a hydraulic oil cylinder, a telescopic rod and two racks, when the hydraulic driving device is used, the hydraulic oil cylinder is provided with the telescopic rod to stretch up and down, and the telescopic rod pulls the two transmission gears to rotate through the two racks so as to drive the two bottom expanding digging cutters to open or close.
8. The support frame comprises a support arm, a support bearing frame and a telescopic variable amplitude oil cylinder, wherein the telescopic variable amplitude oil cylinder is used for adjusting the inclination angle of the support arm, an upright post is vertically and slidably connected with the support arm through a jacking oil cylinder, and the jacking oil cylinder is used for adjusting the ground clearance of the upright post.
9. The hole-leading in-hole static pile driver also comprises a first guide wheel and a second guide wheel, wherein a suspension steel wire rope on a drill rod winch realizes steering through the first guide wheel and the second guide wheel, and the tunneling speed of a drill rod is controlled through the rope releasing speed.
10. The static pile press is characterized by that the bottom-expanding drill bit can be replaced by other tool head, and the down-the-hole hammer is driven by high-pressure air, and the input end of fluid conveying pipe can be connected with air compressor, and can share said power equipment so as to simplify power source of equipment and meet different operation requirements.
Drawings
Fig. 1 is a schematic perspective view of a static pile driver for hole guiding according to embodiment 1 of the present invention.
Fig. 2 is a side view of a static pile driver for hole guiding in accordance with embodiment 1 of the present invention.
Fig. 3 is a sectional view of a drill rod for guiding holes of a static pile driver in guiding holes in embodiment 1 of the invention.
Fig. 4 is a sectional view showing a closed state of a bottom-expanding excavation tool of a bottom-expanding drill bit of a static pile driver for hole guiding in accordance with embodiment 1 of the present invention.
Fig. 5 is a sectional view showing a deployed state of a bottom-expanding excavation tool of a bottom-expanding drill of a static pile driver for hole guiding in accordance with embodiment 1 of the present invention.
Fig. 6 is a first schematic view of the construction method of the static pile driver in the pilot hole of the embodiment 1 of the invention.
Fig. 7 is a schematic view of a second working principle of the construction method of the static pile driver in the pilot hole of the embodiment 1 of the present invention.
Fig. 8 is a third schematic view of the working principle of the construction method of the static pile driver in the pilot hole of the embodiment 1 of the invention.
Fig. 9 is a fourth schematic view of the working principle of the construction method of the static pile driver in the pilot hole of the embodiment 1 of the present invention.
Fig. 10 is a fifth schematic view of the working principle of the construction method of the static pile driver in the pilot hole of the embodiment 1 of the present invention.
Description of reference numerals:
10. a static pressure pile machine, 11, a hydraulic pile pressing mechanism, 12, a hoisting mechanism, 13, a host platform, 20, a support frame, 21, a support arm, 22, a support bearing rack, 23, a telescopic amplitude cylinder, 31, a stand column, 311, a first guide wheel, 312, a second guide wheel, 32, a drill rod power head, 33, a guide frame, 41, a guide hole drill rod, 411, a layer of drill rod, 412, a layer of drill rod, 413, a layer of drill rod, 414, a layer of drill rod, 42, a spiral drill rod, 50, a bottom expanding drill bit, 51, a drill bit main body, 52, a hydraulic driving device, 521, a hydraulic oil cylinder, 522, a telescopic rod, 523, a rack, 53, a bottom expanding digging cutter, 531, a cutter head, 532, digging cutter teeth, 54, a cement opening, 55, a transmission gear, 56, a lower spacer sleeve, 60, a drill rod winch, 61, a suspension steel wire rope, 71, a hydraulic driving pipe, 72, a fluid conveying pipe, 73 and a, 74. the second storage pipe rotary table 80, the tubular piles 81, the enlarged pile heads 90, the foundation soil layer 91, the top soft soil layer 92 and the sustaining hard soil layer.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1:
referring to fig. 1 to 10, a construction method of a static pile driver for digging in a pilot hole according to an embodiment of the present invention includes the following steps:
(1) the pile driver is in place, a static pile driver which is dug in a pilot hole is moved to a region to be constructed, the static pile driver which is dug in the pilot hole comprises a static pile driver 10, a pilot hole drill rod 41, a spiral drill rod 42, a bottom expanding drill bit 50, a drill rod winch 60 and a fluid conveying pipe 72, the static pile driver 10 comprises a hydraulic pile pressing mechanism 11 and a hoisting mechanism 12, the bottom expanding drill bit 50 comprises a bottom expanding digging cutter 53 and a cement releasing port 54, the pilot hole drill rod 41, the spiral drill rod 42 and the bottom expanding drill bit 50 are respectively hollow, and the fluid conveying pipe 72 sequentially penetrates through the pilot hole drill rod 41, the spiral drill rod 42 and the bottom expanding drill bit 50 to be communicated with the cement releasing port;
(2) the pipe pile 80 is installed, the pipe pile 80 to be pressed is hoisted to the hydraulic pile pressing mechanism 11 by utilizing the hoisting mechanism 12, and the bottom of the pipe pile 80 to be pressed is contacted with the top of the center of the pile foundation to be constructed;
(3) the hydraulic pile driving of the top soft soil layer 91 (see fig. 6) is carried out, and the hydraulic pile driving mechanism 11 is utilized to drive the pipe pile 80 to be driven into the top soft soil layer 91 of the foundation soil layer 90; wherein, the foundation soil layer 90 comprises a top soft soil layer 91 and a holding hard soil layer 92 (such as a hard sand layer or a hard stone layer);
(4) installing a drill bit and a drill rod, namely installing a bottom expanding drill bit 50 and a spiral drill rod 42 at the lower end of a guide hole drill rod 41 and inserting the bottom expanding drill bit and the spiral drill rod into a pressure pipe pile 80 to be sent;
(5) the hold hard soil layer 92 is led into a hole to dig and send a pile, the spiral drill rod 42 in the tubular pile 80 and the bellout drill bit 50 discharge soil in the tubular pile 80 through low-speed rotation, and descend along with the tubular pile 80 under the control of the drill rod winch 60; (see fig. 7) when the hydraulic pile pressing mechanism 11 presses the tubular pile 80 to the vicinity of the holding hard soil layer 92 (such as a thick hard sand layer), and the pile pressing force of the hydraulic pile pressing mechanism 11 cannot make the tubular pile 80 sink continuously, the bottom-expanding drill 50 descends to go out and expand the bottom-expanding digging cutter 53, and digs the foundation soil layer 90 under the tubular pile 80 and on the side part (side wall), and the tubular pile 80 is smoothly pressed into the holding hard soil layer 92 by matching with the hydraulic pile pressing mechanism 11; at the moment, the hole guiding and pile pressing operations are carried out synchronously without alternation;
(6) expanding the hole of the holding hard soil layer 92, (see fig. 8) when the tubular pile 80 reaches the position near the designated depth, the bottom expanding drill 50 expands the bottom expanding digging cutter 53 to the maximum angle to continue digging downwards, and the expanded hole is formed;
(7) pouring the pile bottom, wherein one end of a fluid conveying pipe 72 is communicated with a cement pump station, cement is injected into the enlarged hole by the other end of the fluid conveying pipe 72 through a cement release port 54 (shown in figure 9) of the bottom expanding drill bit 50, and the auger stem 42 drives the bottom expanding drill bit 50 to rotate at a low speed to fully stir the cement; cement is filled in the enlarged holes, and the tubular pile 80 is formed by enlarging the pile head 81 so as to obtain larger pile foundation supporting force;
(8) after the pile foundation is completed, (see fig. 10) the bottom-expanding digging cutter 53 is folded by the bottom-expanding drill bit 50, and the auger stem 42 and the bottom-expanding drill bit 50 are lifted by the stem winch 60 to prepare for the next operation; repeating the steps for multiple times to complete the construction operation of all pile foundations required by the engineering.
The construction method comprises the steps that firstly, a pile driver is put in place, a static pile driver digging in a guide hole is moved to a to-be-constructed area, then a pipe pile 80 is installed, a hoisting mechanism 12 is used for hoisting a to-be-pressure-pipe pile 80 to a hydraulic pile pressing mechanism 11, the hydraulic pile pressing mechanism 11 is used for pressing the to-be-pressure-pipe pile 80 into a top soft soil layer 91 of a foundation soil layer 90, then a bottom expanding drill 50 and a spiral drill rod 42 are installed at the lower end of a guide hole drill rod 41 and inserted into the to-be-pressure-pipe pile 80; the auger stem 42 and the bottom-expanding drill 50 in the tubular pile 80 discharge soil in the tubular pile 80 through low-speed rotation, and descend along with the tubular pile 80 under the control of the drill stem winch 60; when the hydraulic pile pressing mechanism 11 presses the tubular pile 80 to be close to the holding hard soil layer 92 and the pile pressing force of the hydraulic pile pressing mechanism 11 cannot enable the tubular pile 80 to sink continuously, the bottom expanding drill 50 descends to go out and expands the bottom expanding digging cutter 53, the foundation soil layer 90 below the tubular pile 80 is dug, and the tubular pile 80 is pressed into the holding hard soil layer 92 by matching with the hydraulic pile pressing mechanism 11; when the tubular pile 80 reaches the position near the designated depth, the bottom-expanding drill bit 50 expands the bottom-expanding digging cutter 53 to the maximum angle to continue digging downwards, and a hole is formed; finally, the cement pump station is communicated with the fluid conveying pipe 72, cement conveyed by the cement pump station is injected into the enlarged hole by utilizing the cement release port 54 of the bottom expanding drill bit 50, and after the enlarged hole is filled with the cement, the pile head 81 of the tubular pile 80 is expanded to be molded; and (5) completing the pile foundation and preparing for the next round of operation. The construction method utilizes construction equipment combining static pressure and hole leading and digging, utilizes the combination of the bottom expanding drill bit 50 and the spiral drill rod 42 to dig and drill the foundation soil layer 90 below the tubular pile 80, realizes that the diameter of the drilled hole is larger than the diameter of the pile, is convenient for static pressure pile sinking of the tubular pile 80 on a bearing layer, leads the hole and pile pressing operation to be synchronously carried out, greatly improves the construction efficiency, shortens the construction time, reduces the construction cost such as energy consumption and the like, and improves the engineering quality of pile sinking construction; the defect that the static pressure pile machine 10 is difficult to penetrate through a thick hard sand layer is overcome, the pile sinking foundation smoothly reaches the designed supporting layer, the pile foundation engineering design requirement is better met, and the pile foundation supporting force superior to the engineering design requirement is obtained.
Referring to fig. 1 to 5, the pilot hole in-hole static pile driver implementing the construction method according to the embodiment of the present invention includes a static pile driver 10, a support frame 20, a column 31, a jacking cylinder, a drill rod power head 32, a pilot hole drill rod 41, a spiral drill rod 42, a bottom-expanding drill bit 50, a guide frame 33, a drill rod hoist 60, and a suspension wire rope 61, where the static pile driver 10 includes a hydraulic pile driver 11, a hoist mechanism 12, and a host platform 13, the hydraulic pile driver 11, the hoist mechanism 12, the support frame 20, and the drill rod hoist 60 are respectively installed on the host platform 13, the hoist mechanism 12 and the support frame 20 are respectively located at two sides of the hydraulic pile driver 11, the column 31 is vertically slidably connected to the support frame 20 through the jacking cylinder, the drill rod power head 32 is installed on the column 31, the guide frame 33 is vertically slidably connected to the column 31, a lower end of the pilot hole, and is connected with the drill rod in a rotating way, the upper end of the pilot hole drill rod 41 is rotationally connected with the guide frame 33, the bottom expanding drill bit 50 is connected with the lower end of the pilot hole drill rod 41 through the spiral drill rod 42, one end of the suspension steel wire rope 61 is connected with the upper end of the pilot hole drill rod 41, and the other end of the suspension steel wire rope 61 is wound on the drill rod winch 60.
The static pile driver for driving in the pilot hole digs and drills the foundation soil layer 90 under the tubular pile 80 and on the side part by combining the bottom expanding drill bit 50 and the spiral drill rod 42, realizes that the diameter of the drilled hole is larger than the diameter of the pile, facilitates the static pile driving of the tubular pile 80 on the bearing layer, adopts a synchronous construction method of combining the static pile driving and the driving in the pilot hole, simplifies the equipment structure and operation besides the advantages of the traditional static pile driver 10, increases the stratum adaptability of pile driving equipment, overcomes the defect that the static pile driver 10 is difficult to penetrate through the thick hard soil layers such as hard sand layers and the like, ensures that the pile driving foundation can smoothly reach the designed bearing layer, better meets the design requirement of the pile foundation engineering, and obtains the pile foundation bearing force superior to the engineering design requirement.
The static pile driver in the pilot hole further comprises a hydraulic driving pipe 71, a fluid conveying pipe 72, a first storage pipe turntable 73, a second storage pipe turntable 74, a first guide wheel 311 and a second guide wheel 312, wherein the first storage pipe turntable 73 is provided with a hydraulic oil inlet, the second storage pipe turntable 74 is provided with a cement inlet, the bottom-expanding drill bit 50 comprises a drill bit main body 51, a hydraulic driving device 52, two bottom-expanding digging cutters 53 and a cement releasing port 54, a drill bit cavity is formed in the drill bit main body 51 in a hollow mode, a drill bit cavity is formed in the pilot hole drill rod 41 and the spiral drill rod 42 in a hollow mode, the hydraulic driving device 52 is installed in the drill bit cavity and is in driving connection with the two bottom-expanding digging cutters 53, one end of the hydraulic driving pipe 71 penetrates through the drill bit cavity in sequence and is communicated with the hydraulic driving device 52, the other end of the hydraulic driving pipe 71 is wound on the first storage pipe turntable 73 and is communicated with the, one end of the fluid delivery tube 72 is threaded through the drill bit cavity and the drill bit cavity is in communication with the cement release port 54, and the other end of the fluid delivery tube 72 is wrapped around the second reservoir turntable 74 and is in communication with the cement input port.
The first guide wheel 311 and the second guide wheel 312 are respectively installed at the top end of the upright column 31, the drill rod winch 60 is installed on the support bearing frame 22, one end of the suspension steel wire rope 61 is connected with the upper end of the spiral drill rod 42, and the other end of the suspension steel wire rope 61 is turned by the first guide wheel 311 and the second guide wheel 312 and then wound on the drill rod winch 60. The hanging wire rope 61 on the drill rod winch 60 realizes steering through the first guide wheel 311 and the second guide wheel 312, and the tunneling speed of the drill rod is controlled through the rope unwinding speed.
The one end and the hydraulic drive device 52 intercommunication of hydraulic drive pipe 71, the winding of the other end of hydraulic drive pipe 71 is in on the first storage pipe carousel 73, make things convenient for accomodating of hydraulic drive pipe 71, and with the hydraulic oil input port intercommunication, the hydraulic oil input port communicates with external hydraulic oil pump station, thereby provide hydraulic drive power for hydraulic drive device 52, the one end of fluid conveyer pipe 72 and the cement of expanding end drill bit 50 release mouth 54 intercommunication, the winding of the other end of fluid conveyer pipe 72 is on second storage pipe carousel 74, make things convenient for accomodating of fluid conveyer pipe 72, and with the cement input port intercommunication, the cement input port communicates with external cement pump station, thereby can be with the cement that the cement pump station provided, pour into the expansion pile head 81 of tubular pile 80 into through cement release mouth 54.
The bottom-expanding drill bit 50 further comprises two transmission gears 55 and a lower spacer sleeve 56, the side walls of the two sides of the middle part of the drill bit accommodating cavity are respectively provided with a first transmission through hole and a second transmission through hole, a cement release port 54 is arranged on the side wall of the lower end of the drill bit accommodating cavity, one end of the bottom-expanding digging cutter 53 is provided with a cutter head 531, the other end of the bottom-expanding digging cutter 53 is provided with digging cutter teeth 532, one ends of the two bottom-expanding digging cutters 53 are respectively arranged on the first transmission through hole and the outer side surface of the second transmission through hole through the digging cutter teeth 532, and are rotatably connected with the outer side surface; the two transmission gears 55 are respectively arranged in the first transmission through hole and the second transmission through hole and are respectively meshed with the two digging cutter teeth 532, and the hydraulic driving device 52 is in driving connection with the two transmission gears 55. When the bottom-enlarging digging cutter 53 is used, the hydraulic driving device 52 drives the two transmission gears 55 to rotate, the transmission gears 55 drive the digging cutter teeth 532, and the digging cutter teeth 532 drive the bottom-enlarging digging cutter 53 to open.
The hydraulic driving device 52 comprises a hydraulic oil cylinder 521, an expansion link 522 and two racks 523, the lower spacer 56 is installed in the middle of the drill bit accommodating cavity, a rotary through hole is formed in the middle of the lower spacer 56, the hydraulic oil cylinder 521 is installed at the upper end of the drill bit accommodating cavity, the upper end of the expansion link 522 is telescopically connected with the hydraulic oil cylinder 521, the lower end of the expansion link 522 penetrates through the rotary through hole and is rotatably connected with the lower spacer 56, and the two racks 523 are respectively installed on two sides of the middle of the expansion link 522 and are respectively meshed with the two transmission gears 55. When the bottom-expanding digging tool is used, the hydraulic oil cylinder 521 with the telescopic rod 522 stretches up and down, and the telescopic rod 522 pulls the two transmission gears 55 to rotate through the two racks 523, so that the two bottom-expanding digging tools 53 are driven to open or close.
The support frame 20 comprises a support arm 21, a support bearing frame 22 and a telescopic variable amplitude oil cylinder 23, the support bearing frame 22 is installed on the host platform 13, the lower ends of the support arm 21 and the telescopic variable amplitude oil cylinder 23 are respectively hinged with the top surface of the support bearing frame 22, the upper end of the telescopic variable amplitude oil cylinder 23 is hinged with the upper end of the support arm 21, and the upright column 31 is connected with the support arm 21 in a vertical sliding mode through a jacking oil cylinder. The telescopic variable-amplitude oil cylinder 23 is used for adjusting the inclination angle of the supporting arm 21, the upright column 31 is in vertical sliding connection with the supporting arm 21 through a jacking oil cylinder, and the jacking oil cylinder is used for adjusting the ground clearance of the upright column 31.
The guide hole drill rod 41 comprises a first drill rod 411, a second drill rod 412, a third drill rod 413 and a fourth drill rod 414, the first drill rod 411, the second drill rod 412, the third drill rod 413 and the fourth drill rod 414 are respectively hollow, the first drill rod 411, the second drill rod 412, the third drill rod 413 and the fourth drill rod 414 are sequentially sleeved with a telescopic connection from the outer layer to the inner layer, the upper end of the first drill rod 411 is rotatably connected with the guide frame 33, the lower end of the first drill rod 411 penetrates through the drill rod power head 32 and is rotatably connected with the same, and the lower end of the fourth drill rod 414 is connected with the spiral drill rod 42.
According to the static pile press for hole guiding and middle digging and the construction method thereof provided by the embodiment of the invention, through synchronous improvement of the construction method and the construction equipment, hole guiding, middle digging and pile press operation can be synchronously carried out without alternation, the operation steps are greatly simplified, the operation time is shortened, the energy is saved, and the pile sinking engineering quality is improved.
Example 2:
the static pile driver for digging in the pilot hole and the construction method thereof provided by the embodiment of the invention are basically the same as the embodiment 1, and the difference is that:
the static pile driver for digging in the pilot hole further comprises a down-the-hole hammer, and the step (5) further comprises the following steps:
(51) if the bottom-enlarging drill 50 is difficult to dig the bearing stratum soil (hard sand layer or hard stone layer), the bottom-enlarging drill 50 is replaced by a down-the-hole hammer, the hard sand layer or the hard stone layer in the foundation soil layer 90 below the tubular pile 80 is crushed and dug, and then the tubular pile 80 is pressed into the bearing stratum 92 by matching with the hydraulic pile pressing mechanism 11. When the bottom-expanding drill bit 50 is replaced by the down-the-hole hammer, an external air compressor connected with the down-the-hole hammer through a fluid conveying pipe 72 can be used, and the high-pressure air output by the down-the-hole hammer is used for driving the down-the-hole hammer to work, so that the equipment structure and power equipment are simplified.
In the embodiment of the invention, a down-the-hole hammer (not shown in the figure) of a static pile press is dug in the pilot hole, and the down-the-hole hammer can replace a bottom-expanding drill bit 50 and is arranged at the lower end of a spiral drill rod 42.
In other embodiments, the underreamer 50 may be replaced with other pneumatic tool bits depending on the particular needs of the construction. In this embodiment, this down-the-hole hammer adopts high-pressure air drive, connects the air compressor machine with fluid delivery pipe 72 input, and the high-pressure air source that this air compressor machine produced of sharing to simplify the mechanism and the power equipment of equipment, reduce the manufacturing cost of equipment and can adapt to different operation demands.
The above are merely specific embodiments of the present invention, and the scope of the present invention is not limited thereby; any alterations and modifications without departing from the spirit of the invention are within the scope of the invention.
Claims (10)
1. A construction method for digging a static pile press in a pilot hole is characterized by comprising the following steps:
(1) the static pile pressing machine is arranged in a guide hole and comprises a static pile pressing machine, a guide hole drill rod, a spiral drill rod, a bottom expanding drill bit, a drill rod winch and a fluid conveying pipe, wherein the bottom expanding drill bit comprises a bottom expanding digging cutter and a cement releasing port, the guide hole drill rod, the spiral drill rod and the bottom expanding drill bit are respectively hollow, and the fluid conveying pipe sequentially penetrates through the guide hole drill rod, the spiral drill rod and the bottom expanding drill bit and is communicated with the cement releasing port;
(2) the pipe pile installation, namely hoisting the pipe pile to be pressed to the hydraulic pile pressing mechanism by using a hoisting mechanism, and enabling the bottom of the pipe pile to be pressed to be in contact with the top of the center of the pile foundation to be constructed;
(3) the hydraulic pile pressing mechanism is utilized to press the pipe pile to be pressed into the top soft soil layer of the foundation soil layer; wherein the foundation soil layer comprises a top soft soil layer and a holding hard soil layer;
(4) installing a drill bit and a drill rod, namely installing a bottom expanding drill bit and a spiral drill rod at the lower end of a guide hole drill rod and inserting the bottom expanding drill bit and the spiral drill rod into a pressure pipe pile to be sent;
(5) the pile is dug and sent in the guide hole of the holding hard soil layer, a spiral drill rod in the tubular pile and a bottom expanding drill bit are rotated at low speed to discharge soil in the tubular pile, and the spiral drill rod and the bottom expanding drill bit descend along with the tubular pile under the control of a drill rod winch; when the hydraulic pile pressing mechanism presses the pipe pile to the vicinity of the holding hard soil layer and the pile pressing force of the hydraulic pile pressing mechanism cannot enable the pipe pile to sink continuously, the bottom expanding drill bit descends and goes out and expands the bottom expanding digging cutter, so that the foundation soil layer under and at the side part of the pipe pile is dug, and the hydraulic pile pressing mechanism is matched to press the pipe pile into the holding hard soil layer;
(6) expanding the hole in the hard soil layer, and when the tubular pile reaches the position near the specified depth, expanding the bottom-expanding digging cutter to the maximum angle by using the bottom-expanding drill bit, continuously digging downwards, and forming an expanded hole;
(7) pouring the pile bottom, wherein one end of the fluid conveying pipe is communicated with a cement pump station, the other end of the fluid conveying pipe injects cement into the enlarged hole by utilizing a cement releasing port of the bottom expanding drill bit, and the auger stem drives the bottom expanding drill bit to rotate at a low speed so as to fully stir the cement; cement is filled in the enlarged holes, and the enlarged pile heads of the tubular piles are formed;
(8) and after the pile foundation is finished, the bottom expanding digging cutter is folded by the bottom expanding drill bit, and the spiral drill rod and the bottom expanding drill bit are lifted by the drill rod winch to prepare for the next round of operation.
2. The construction method of a pilot hole static pile driver according to claim 1, wherein said pilot hole static pile driver further comprises a down-the-hole hammer, and said step (5) further comprises the steps of:
(51) if, if expand end drill bit excavation holding power layer's stereoplasm soil or during the hard stone difficulty, use down the hole hammer replacement expand end drill bit, smash, dig the stereoplasm sand bed or the hard stone layer in the foundation soil layer of tubular pile below, then cooperate hydraulic pressure pile pressing mechanism to impress the tubular pile holding power layer.
3. A static pile driver for digging in pilot hole for implementing the construction method as claimed in any one of claims 1 to 2, which comprises a static pile driver, a support frame, a column, a jacking cylinder, a drill rod power head, a pilot hole drill rod, a spiral drill rod, a bottom-expanding drill bit, a guide frame, a drill rod hoist and a suspension steel wire rope, wherein the static pile driver comprises a hydraulic pile pressing mechanism, a hoisting mechanism and a host platform, the hydraulic pile pressing mechanism, the hoisting mechanism, the support frame and the drill rod hoist are respectively arranged on the host platform, the hoisting mechanism and the support frame are respectively arranged at two sides of the hydraulic pile pressing mechanism, the column is vertically and slidably connected with the support frame through the jacking cylinder, the drill rod power head is arranged on the column, the guide frame is vertically and slidably connected with the column, the lower end of the pilot hole drill rod passes through the drill rod power head, the bottom expanding drill bit is connected with the lower end of the pilot hole drill rod through the spiral drill rod, one end of the hanging steel wire rope is connected with the upper end of the pilot hole drill rod, and the other end of the hanging steel wire rope is wound on the drill rod winch.
4. The pilot hole boring static pile driver according to claim 3, further comprising a hydraulic driving tube, a fluid delivery tube, a first storage tube turntable, a second storage tube turntable, said first storage tube turntable having a hydraulic oil input port, said second storage tube turntable having a cement input port, said bottom-enlarging drill bit comprising a drill bit body, a hydraulic driving device, two bottom-enlarging cutters, and a cement discharge port, said drill bit body being hollow to form a drill bit cavity, said pilot hole drill rod and auger rod being hollow to form a drill rod cavity, said hydraulic driving device being installed in said drill bit cavity and being drivingly connected to said two bottom-enlarging cutters, one end of said hydraulic driving tube passing through said drill rod cavity, said drill bit cavity communicating with said hydraulic driving device in sequence, the other end of said hydraulic driving tube being wound around said first storage tube turntable and communicating with said hydraulic oil input port, one end of the fluid conveying pipe penetrates through the drill rod containing cavity and the drill bit containing cavity and is communicated with the cement release port, and the other end of the fluid conveying pipe is wound on the second storage pipe rotary table and is communicated with the cement input port.
5. The pilot hole static pile driver according to claim 4, wherein said bottom-enlarging bit further comprises two driving gears, a first driving through hole and a second driving through hole are respectively formed on the side walls of both sides of the middle portion of said bit housing, said cement discharge port is formed on the side wall of the lower end of said bit housing, a cutter head is formed at one end of said bottom-enlarging cutter, cutter teeth are formed at the other end of said bottom-enlarging cutter, and said two bottom-enlarging cutters are respectively mounted on the outer side surfaces of said first driving through hole and said second driving through hole through one end of said cutter teeth and rotatably connected with the outer side surface of said bit body; the two transmission gears are respectively arranged in the first transmission through hole and the second transmission through hole and are respectively meshed with the two digging cutter teeth, and the hydraulic driving device is in driving connection with the two transmission gears.
6. The pilot hole boring static pile driver according to claim 5, wherein the bottom-enlarging bit further comprises a lower spacer, the hydraulic driving device comprises a hydraulic cylinder, a telescopic rod, and two racks, the lower spacer is mounted in the middle of the bit-receiving cavity, a rotary through hole is provided in the middle of the lower spacer, the hydraulic cylinder is mounted at the upper end of the bit-receiving cavity, the upper end of the telescopic rod is telescopically connected to the hydraulic cylinder, the lower end of the telescopic rod is connected to the rotary through hole and rotatably connected to the lower spacer, the two racks are mounted on two sides of the middle of the telescopic rod respectively and respectively engaged with the two transmission gears.
7. A static pile driver for driving in a hole according to any one of claims 3 to 6 wherein the support frame comprises a support arm, a support pedestal frame and a telescopic variable amplitude cylinder, the support pedestal frame is mounted on the host platform, the lower ends of the support arm and the telescopic variable amplitude cylinder are respectively hinged with the top surface of the support pedestal frame, the upper end of the telescopic variable amplitude cylinder is hinged with the upper end of the support arm, and the upright post is vertically connected with the support arm in a sliding manner through the jacking cylinder.
8. The pilot hole static pile driver as claimed in claim 7, further comprising a first guide wheel and a second guide wheel, wherein the first guide wheel and the second guide wheel are respectively installed at the top end of the column, the drill pipe hoist is installed on the support pedestal, one end of the suspension wire rope is connected with the upper end of the auger pipe, and the other end of the suspension wire rope is turned by the first guide wheel and the second guide wheel and then wound on the drill pipe hoist.
9. A static pile driver in a pilot hole according to any one of claims 3 to 6 wherein the pilot hole drill rod comprises a first drill rod, a second drill rod, a third drill rod and a fourth drill rod, the first drill rod, the second drill rod, the third drill rod and the fourth drill rod are hollow respectively, the first drill rod, the second drill rod, the third drill rod and the fourth drill rod are sequentially sleeved with a telescopic connection from the outer layer to the inner layer, the upper end of the first drill rod is rotatably connected with the guide frame, the lower end of the first drill rod penetrates through the drill rod power head and is rotatably connected with the drill rod power head, and the lower end of the fourth drill rod is connected with the auger rod.
10. A pilot hole static pile driver according to any one of claims 3 to 6 further including a down-the-hole hammer mounted at the lower end of the auger stem in place of the underreamer.
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| CN202110308237.6A CN113026746A (en) | 2021-03-23 | 2021-03-23 | Static pile press for hole guiding and digging and construction method thereof |
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| CN202110308237.6A CN113026746A (en) | 2021-03-23 | 2021-03-23 | Static pile press for hole guiding and digging and construction method thereof |
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| CN113774911A (en) * | 2021-09-30 | 2021-12-10 | 山东建筑大学 | Pipe pile variable-diameter hole leading and pile pressing synchronous construction equipment and method |
| CN113882376A (en) * | 2021-09-17 | 2022-01-04 | 湖南铁甲智能技术有限公司 | Pile sinking construction method and construction structure of prestressed pipe pile |
| CN115341543A (en) * | 2022-08-19 | 2022-11-15 | 广州市胜特建筑科技开发有限公司 | Semi-automatic pile pressing mechanism of hole leading type static pile pressing machine |
| CN117569318A (en) * | 2024-01-17 | 2024-02-20 | 浙江江南春建设集团有限公司 | Prefabricated sheet pile hole guiding device for underwater polished stone layer and construction method thereof |
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