WO2021189840A1

WO2021189840A1 - Construction method and construction apparatus for static-pressure tube-sinking pile

Info

Publication number: WO2021189840A1
Application number: PCT/CN2020/124398
Authority: WO
Inventors: 姚锋祥; 包华; 朱建新; 金波
Original assignee: 姚锋祥; 包华; 朱建新
Priority date: 2020-10-26
Filing date: 2020-10-28
Publication date: 2021-09-30
Also published as: CN112227349A

Abstract

A construction method and a construction apparatus for a static-pressure tube-sinking pile. The method comprises a positioning step and a tube sinking step. A tube sinking method comprises: starting a pressurizing static-pressure system and a tube sinking system of a pile construction apparatus, alternately pressurizing an outer tube (5) and an inner tube (6), and sinking the tube sinking system to a set depth. The pressurizing static-pressure system comprises a vertical frame (2) provided on a static-pressure pile machine chassis (1), a group of hydraulic holding pile grippers (3) provided on the chassis (1), and a group of hydraulic holding pile grippers (4) provided on the vertical frame (2). The tube sinking system comprises the steel outer tube (5) of a set rigidity and strength, the inner tube (6) of a set rigidity and strength, and an inner pipe hammer system.

Description

Construction method and construction equipment of static pressure sinking pipe pile

Technical field

The invention relates to a construction method and construction equipment of a static pressure sinking pipe pile.

Background technique

Among the existing construction techniques of static pressure piles, sinking pipe piles, cement-soil piles, and composite piles, sinking pipe sinking technology, bottom expansion technology, feeding technology, pile connection, pile planting technology, synchronous integration, streamlined operation technology Needs to be improved and ergonomics needs to be improved; the existing pile driver has a maximum pile pressing force of 1,200 tons (self weight + counterweight) and a maximum pile pulling force of 800 tons. It is difficult for a full-load general site to meet the construction requirements.

technical problem

The purpose of the present invention is to provide a construction method and construction equipment for the static pressure sinking pipe pile with simple method and good effect.

Technical solutions

A method for constructing a pile includes the construction of a first pile as a peripheral pile and a second pile as a core pile. The construction of the second pile includes the steps of positioning, sinking, and pouring, and is characterized by: sinking The method includes: starting the pressurized static pressure system and the immersed pipe system of the pile work equipment, alternately pressurize the outer pipe and the inner pipe, and sink the immersed pipe system to a set depth;

The pressurized static pressure system includes a stand set on the chassis of the static pile driver, a set of hydraulic pressure pile clamps set on the chassis, and a set of hydraulic pressure pile clamps or hydraulic pressure pile clamps set on the stand. ; The immersed pipe system includes a steel outer pipe with a set stiffness and an inner pipe hammer system with a set stiffness and strength;

The method of alternately pressurizing the outer tube and inner tube to sink the immersed tube system to a set depth includes at least one of the following methods:

(1) The outer pipe sinks under pressure and the inner pipe is rammed; the outer pipe sinks under pressure and the inner pipe is rammed to realize the sinking of the pipe;

(2) The outer pipe vibrates and sinks, and the inner pipe rammed the soil; the interactive outer pipe vibrates and sinks, and the inner pipe rammed the soil to realize the sinking of the pipe;

(3) The outer tube sinks under holding pressure, and the inner tube tops the soil; the outer tube alternately sinks under the holding pressure, and the inner tube presses the soil to realize the sinking of the tube;

(4) Potential energy acts on the sinking of the inner tube and the outer tube respectively, and the interaction potential energy acts on the inner tube and the outer tube respectively to realize the sinking of the tube.

The specific method of alternately pressurizing the outer tube and inner tube to sink the immersed tube system to a set depth includes at least one of the following methods:

(1), a) The hydraulic holding clamp on the chassis holds the outer pipe downward, sinking the pipe to a set stroke, and the soil under the outer pipe enters the outer pipe to a certain thickness; b) the hydraulic holding pressure on the stand Pile gripper, through the wire ropes connected together, pull the inner tube downwards through the ramming plate on the inner tube for a stroke, extruding the soil in the outer tube; c) alternate steps a) and b) until the inner tube, The outer tube is immersed to the set depth;

(2), a) The hydraulic holding clamp on the chassis holds the outer pipe downward, sinking the pipe to a set stroke, and the soil under the outer pipe enters the outer pipe to a certain thickness; b) Hydraulic holding pressure on the stand The pile gripper, through the horizontal beams connected together, sinks the pipe downwards through the ramming plate on the inner pipe and squeezes out the soil in the inner pipe; c) alternate steps a) and b) until the inner pipe The tube and outer tube are immersed to the set depth;

(3), a) The hydraulic holding and pressing pile clamp on the chassis, through the wire ropes connected together, pulls the inner tube back through the upper ramming plate of the inner tube, sinks the tube downward for a stroke, and the inner tube statically flushes the inner tube under the inner tube. Soil; b) The hydraulic holding and pressing pile clamp on the stand holds the outer pipe and moves to the next one along the inner pipe; c) Interacting steps a) and b) until the inner and outer pipes are immersed to the set depth ；

(4), a) The hydraulic holding and pressing pile clamp on the chassis, through the horizontal beams connected together, passes through the ramming plate on the inner tube to back pressure the inner tube to the next stroke, and the inner tube statically washes the soil under the inner tube B) The hydraulic holding and pressing pile clamp on the stand holds and presses the outer pipe, and moves to the next stroke along the inner pipe; c) Interacts steps a) and b) until the inner pipe and outer pipe sink to the set depth;

(5), a) The hydraulic holding and pressing pile clamp on the stand, through the wire ropes connected together, pulls the inner tube back through the upper ramming plate of the inner tube, sinks the tube down for a stroke, and the inner tube statically flushes the inner tube down B) The hydraulic pressure pile clamp on the chassis presses the outer pipe and moves along the inner pipe to the next stroke; c) Interact steps a) and b) until the inner and outer pipes are immersed to the set depth ；

(6), a) The hydraulic holding and pressing pile clamp on the stand, through the horizontal beams connected together, passes through the ramming plate on the inner pipe to back pressure the inner pipe to the next stroke, and the inner pipe statically washes the soil under the inner pipe. Body; b) The hydraulic holding and pressing pile clamp on the chassis holds the outer tube and moves along the inner tube to the next stroke; c) Interact steps a) and b) until the inner tube and outer tube sink to the set depth;

(7) For the soft soil area, the pile pressing force is small and the pipe sinking resistance is small, and the dead weight of the pile driver can satisfy the pile pressing force. The following methods are used:

a) The hydraulic pressure pile clamp on the chassis holds the outer pipe downward and sinks the pipe to a set stroke; b) The hydraulic pressure pile clamp on the stand holds the pressure outer pipe downward, and sinks the pipe to a set stroke. Set itinerary; c) Interact steps a) and b) until the immersed pipe system is immersed to the set depth;

(8) For hard soil areas, the pile pressing force is large and the pipe sinking resistance is large, and the dead weight of the pile driver cannot satisfy the pile pressing force. The following methods are used:

a) The hydraulic clamping pile clamp on the chassis clamps the outer pipe downward and sinks the pipe to a set stroke; b) The hydraulic clamping pile clamp on the stand connects the inner pipe through the steel wire rope or horizontal beam connected together. The pipe is lifted upward for a stroke, and then the connection between the steel wire rope or horizontal beam and the inner pipe is loosened, the inner pipe freely falls, punching and shearing the soil inside and under the outer pipe, and sinking the pipe downward; c) Interaction a), b) Steps until the inner tube and outer tube are immersed to the set depth;

(9), a) The hydraulic holding clamp on the chassis holds the outer tube downward, sinks the tube to a set stroke, and the soil under the outer tube enters the outer tube to a certain thickness; b) the hydraulic holding clamp on the chassis The pile device passes through the horizontal beams connected together, through the ramming plate on the inner tube, back pressures the inner tube to the next stroke, and extrudes the soil in the outer tube and under the outer tube; c) alternate steps a) and b) until the inner tube The tube and outer tube are immersed to the set depth;

(10), a) The hydraulic holding and pressing pile clamp on the chassis, through the horizontal beams connected together, through the ramming plate on the inner tube, the inner tube is counter-pressured and the inner tube sinks for a stroke to extrude the soil under the inner tube. ; B) The hydraulic holding and pressing pile clamp on the chassis holds the outer pipe and sinks the pipe one stroke downwards along the inner pipe; c) Interact steps a) and b) until the inner pipe and the outer pipe sink to the set depth;

(11), a) Hydraulic pressure pile clamp on the chassis or stand, the pressure outer pipe sinks down for one stroke, and the soil under the outer pipe enters a certain thickness inside the outer pipe; b) Hydraulic pressure on the chassis The holding pressure pile clamp, through the wire ropes connected together, pulls the inner tube downwards through the ramming plate of the inner tube for one stroke, extruding the soil inside and under the outer tube; c) Interaction a), b 1) Steps until the inner and outer pipes are immersed to the set depth;

(12), a) The hydraulic pressure pile clamp on the chassis or stand, through the steel wire ropes connected together, pulls the inner tube downwards through the upper ramming plate of the inner tube for one stroke, and extrudes the inner tube downward B) The hydraulic holding and pressing pile clamp on the chassis or stand, holding and pressing the outer pipe to sink one stroke down the inner pipe; c) Interact steps a) and b) until the inner pipe and the outer pipe Immerse the tube to the set depth;

(13), a) The hydraulic holding and pressing pile clamp on the chassis or stand, the holding and pressing outer pipe sinks to a certain depth; in the case of hard soil, the weight of the pile driver cannot meet the requirements of pile pressing force, and the pipe cannot be sunk inside. The internal rammer of a certain weight is built in the tube. The internal rammer is a self-falling hammer, an electric hammer or a hydraulic hammer. Cross over until the inner tube and outer tube are immersed to the set depth.

The construction method of the first pile is one of the following methods:

(1) Method 1:

(1) Move the machine into place: move the construction equipment and place the drill rod on the set pile position;

(2) Spinning sinking: Spin down the drill pipe to the set depth;

(3) Rotate and pull up: Rotate and pull the drill pipe to the set height;

(4) Repeat steps (2) and (3) to punch, cut and stir the underground in-situ soil into a fine grain shape; at the same time, use at least one of air jet, water spray, grout, and sand blasting to mix with liquid Or solid curing agent, punching and cutting, spraying and stirring until the first pile meets the set requirements;

(2) Method 2:

(2) Spinning sinking: Spin down the drill pipe to the set depth, take out all or part of the soil, and take out all or part of the underground in-situ soil;

(3) Rotating and lifting: Rotating and lifting the drill pipe to the set height;

(4) Repeat steps (1), (2), (3) to take out all or part of the underground in-situ soil, and refill the pre-mixed cement soil into the borehole until the first pile meets the set requirements.

The first pile is a non-borrowing in-situ cement-soil pile, a pre-mixed cement-soil pile that takes all or part of the soil and then refills it into the ground; the first pile has expanded top, expanded diameter, expanded bottom, and full screw threads along the pile body One or more of the same diameter or variable diameter form among all straight lines, inter-threads and straight lines.

The bottom expansion method of the first pile is mechanical expansion or hydraulic expansion, which is formed by repeated spraying and stirring.

The second pile is a static pressure pile, and the pile body is a precast pile or a cast-in-place pile; the second pile body has one or more of expanded top, expanded diameter, expanded bottom, full thread, full straight line, inter-threaded and straight line Kind of the same diameter or variable diameter form.

The bottom expansion method of the second pile is one or more forms of static pressure, internal ramming, internal ramming, and internal ramming.

The bottom of the second pile is expanded or not after sinking; when the bottom needs to be expanded, the bottom is expanded first, and then the pouring and forming construction is carried out; the pouring and forming construction method is: raising the inner pipe system, building the pile body or implanting the prefabricated pile body The immersed tube system is a single-steel outer tube, inner tube and connecting rods with set strength and rigidity. The outer diameter of the inner tube is smaller than the inner diameter of the outer tube; the inner tube can be used as a force-transmitting rod as well as a power rod; Built-in internal rammer of a certain weight, the inner tube and the internal rammer form an internal rammer tube hammer; the internal rammer can be used as an empty tank for storing filling materials, and as a soil borrow chamber for taking the in-situ soil under the inner tube; During bottom construction, the filler is put into the cavity between the inner and outer pipes, the inner pipe cavity, the outer pipe and the inner pipe are pulled up, the inner rammer is raised, and the filler overflows from the discharge port. Impulse, penetration, single control, double control, three control, four control setting parameters, repeated holding pressure, top pressure, back pressure, vibrating, internal ramming, internal ramming, static stamping, dynamic impact filler, Carry out dynamic compaction and compaction replacement, seal the bottom to stop the water, and form the required enlarged head.

A pile construction equipment includes a static pile driver and a sinking pipe system. It is characterized in that a stand is set on the chassis of the static pile press, and slide rails are provided on the left and right sides of the stand. The drill pipe mixing power head is slidingly matched, and the slide rail on the other side is matched with the pipe fixing device when the pipe is immersed.

The chassis is equipped with hydraulic holding and pressing pile clamps for pipe holding operations, and the stand is equipped with hydraulic holding and pressing pile clamps for holding pipe operations; Pipe and inner pipe hammer system.

An upper ramming disk is placed on the inner tube, and a lower ramming disk is set under the upper ramming disk; the diameter of the upper ramming disk ≥ the diameter of the lower ramming disk ≥ the diameter of the outer tube; the length of the outer tube ≤ the length of the inner tube.

Beneficial effect

The invention has convenient construction, good environmental protection performance, good construction quality and high cost performance.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the construction equipment of the present invention.

Figure 2 is a schematic diagram of the immersed tube system.

Figure 3 is a schematic diagram of the structure of the stand.

The best mode of the present invention

A pile construction method includes the construction of the first pile as the peripheral pile and the construction of the second pile as the core pile. The construction of the second pile includes the steps of setting in place, sinking a pipe, and pouring and forming. The sinking method includes: starting The pressurized static pressure system and the immersed pipe system of the piling equipment, alternately pressurize the outer pipe and the inner pipe, and sink the immersed pipe system to the set depth;

The stand is a multifunctional stand: a stand for setting potential energy functions such as holding pressure, top pressure, mixing power head, electric hammer, diesel hammer, vibrating hammer, etc. The stand is set on one side, two sides, three sides or four sides Matching function guide rail device.

The potential energy includes static pressure holding pressure, top pressure, back pressure, vibration, vibrating, rotating, shaking, internal ramming, internal ramming, spiral, down-the-hole impact, self-gravity potential energy, etc.

The construction method of the first pile is one of the following methods:

(1) Method 1:

(2) Spinning sinking: Spin down the drill pipe to the set depth;

(3) Rotate and pull up: Rotate and pull the drill pipe to the set height;

(2) Method 2:

The bottom of the second pile is expanded or not after sinking; when the bottom needs to be expanded, the bottom is expanded first, and then the pouring and forming construction is carried out; the pouring and forming construction method is: raising the inner pipe system, building the pile body or implanting the prefabricated pile body The immersed tube system is a single-steel outer tube, inner tube and connecting rods with set strength and rigidity. The outer diameter of the inner tube is smaller than the inner diameter of the outer tube; the inner tube can be used as a force-transmitting rod as well as a power rod; Built-in internal rammer of a certain weight, the inner tube and the internal rammer form an internal rammer tube hammer; the internal rammer can be used as an empty tank for storing filling materials, and as a soil borrow chamber for taking the in-situ soil under the inner tube; During bottom construction, the filling material is put into the cavity between the inner and outer pipes, the inner pipe cavity, the outer pipe and the inner pipe are pulled up, the inner rammer is raised, and the filling material overflows from the discharge port; according to the feeding amount, pile pressing force, vibration Impulse, penetration, single control, double control, three control, four control setting parameters, repeated holding pressure, top pressure, back pressure, vibrating, internal ramming, internal ramming, static stamping, dynamic impact filler, Carry out dynamic compaction and compaction replacement, seal the bottom to stop the water, and form the required enlarged head.

A pile construction equipment includes a static pile driver and a sinking pipe system. A stand 2 is set on the chassis 1 of the static pile press. The left and right sides of the stand are provided with slide rails 9, 10, one of which is a slide rail It is slidingly matched with the drill pipe mixing power head, and the slide rail on the other side is matched with the pipe fixing device when the pipe is immersed.

The hydraulic clamping pile clamp 3 is installed on the chassis for pipe clamping operation, and the hydraulic clamping pile clamp 4 is installed on the stand; Strong inner tube 6 and inner tube hammer system.

The upper ramming disk 7 is set on the inner tube, and the lower ramming disk 8 is set under the upper ramming disk; the diameter of the upper ramming disk ≥ the diameter of the lower ramming disk ≥ the diameter of the outer tube; the length of the outer tube ≤ the length of the inner tube.

Claims

A static pressure sinking pipe pile construction method includes the construction of the first pile as the peripheral pile and the construction of the second pile as the core pile. The construction of the second pile includes the steps of setting in place, sinking the pipe, and pouring and forming. Its characteristics are Yes: The immersed pipe method includes: starting the pressurized static pressure system and immersed pipe system of the pile work equipment, alternately pressurize the outer and inner pipes, and sink the immersed pipe system to a set depth;

The pressurized static pressure system includes a stand set on the chassis of the static pile driver, a set of hydraulic pressure pile clamps set on the chassis, and a set of hydraulic pressure pile clamps or hydraulic pressure pile clamps set on the stand. ; The immersed pipe system includes a steel outer pipe with a set stiffness and an inner pipe hammer system with a set stiffness and strength;

The method of alternately pressurizing the outer tube and inner tube to sink the immersed tube system to a set depth includes at least one of the following methods:

(1) The outer pipe sinks under pressure and the inner pipe is rammed; the outer pipe sinks under pressure and the inner pipe is rammed to realize the sinking of the pipe;

(2) The outer pipe vibrates and sinks, and the inner pipe rammed the soil; the interactive outer pipe vibrates and sinks, and the inner pipe rammed the soil to realize the sinking of the pipe;

(3) The outer tube sinks under holding pressure, and the inner tube tops the soil; the outer tube alternately sinks under the holding pressure, and the inner tube presses the soil to realize the sinking of the tube;

(4) Potential energy acts on the sinking of the inner tube and the outer tube respectively, and the interaction potential energy acts on the inner tube and the outer tube respectively to realize the sinking of the tube.
The static pressure sinking pipe pile construction method according to claim 1, characterized in that: the concrete method of alternately pressurizing the outer pipe and the inner pipe to sink the immersed pipe system to a set depth includes at least one of the following methods:

(1), a) The hydraulic holding clamp on the chassis holds the outer pipe downward, sinking the pipe to a set stroke, and the soil under the outer pipe enters the outer pipe to a certain thickness; b) the hydraulic holding pressure on the stand Pile gripper, through the wire ropes connected together, pull the inner tube downwards through the ramming plate on the inner tube for a stroke, extruding the soil in the outer tube; c) alternate steps a) and b) until the inner tube, The outer tube is immersed to the set depth;

(2), a) The hydraulic holding clamp on the chassis holds the outer pipe downward, sinking the pipe to a set stroke, and the soil under the outer pipe enters the outer pipe to a certain thickness; b) Hydraulic holding pressure on the stand The pile gripper, through the horizontal beams connected together, sinks the pipe downwards through the ramming plate on the inner pipe and squeezes out the soil in the inner pipe; c) alternate steps a) and b) until the inner pipe The tube and outer tube are immersed to the set depth;

(3), a) The hydraulic holding and pressing pile clamp on the chassis, through the wire ropes connected together, pulls the inner tube back through the upper ramming plate of the inner tube, sinks the tube downward for a stroke, and the inner tube statically flushes the inner tube under the inner tube. Soil; b) The hydraulic holding and pressing pile clamp on the stand holds the outer pipe and moves to the next one along the inner pipe; c) Interacting steps a) and b) until the inner and outer pipes are immersed to the set depth ；

(4), a) The hydraulic holding and pressing pile clamp on the chassis, through the horizontal beams connected together, passes through the ramming plate on the inner tube to back pressure the inner tube to the next stroke, and the inner tube statically washes the soil under the inner tube B) The hydraulic holding and pressing pile clamp on the stand holds and presses the outer pipe, and moves to the next stroke along the inner pipe; c) Interacts steps a) and b) until the inner pipe and outer pipe sink to the set depth;

(5), a) The hydraulic holding and pressing pile clamp on the stand, through the wire ropes connected together, pulls the inner tube back through the upper ramming plate of the inner tube, sinks the tube down for a stroke, and the inner tube statically flushes the inner tube down B) The hydraulic pressure pile clamp on the chassis presses the outer pipe and moves along the inner pipe to the next stroke; c) Interact steps a) and b) until the inner and outer pipes are immersed to the set depth ；

(6), a) The hydraulic holding and pressing pile clamp on the stand, through the horizontal beams connected together, passes through the ramming plate on the inner pipe to back pressure the inner pipe to the next stroke, and the inner pipe statically washes the soil under the inner pipe. Body; b) The hydraulic holding and pressing pile clamp on the chassis holds the outer tube and moves along the inner tube to the next stroke; c) Interact steps a) and b) until the inner tube and outer tube sink to the set depth;

(7) For the soft soil area, the pile pressing force is small and the pipe sinking resistance is small, and the dead weight of the pile driver can satisfy the pile pressing force. The following methods are used:

a) The hydraulic pressure pile clamp on the chassis holds the outer pipe downward and sinks the pipe to a set stroke; b) The hydraulic pressure pile clamp on the stand holds the pressure outer pipe downward, and sinks the pipe to a set stroke. Set itinerary; c) Interact steps a) and b) until the immersed pipe system is immersed to the set depth;

(8) For hard soil areas, the pile pressing force is large and the pipe sinking resistance is large, and the dead weight of the pile driver cannot satisfy the pile pressing force. The following methods are used:

a) The hydraulic clamping pile clamp on the chassis clamps the outer pipe downward and sinks the pipe to a set stroke; b) The hydraulic clamping pile clamp on the stand connects the inner pipe through the steel wire rope or horizontal beam connected together. The pipe is lifted upward for a stroke, and then the connection between the steel wire rope or horizontal beam and the inner pipe is loosened, the inner pipe freely falls, punching and shearing the soil inside and under the outer pipe, and sinking the pipe downward; c) Interaction a), b) Steps until the inner tube and outer tube are immersed to the set depth;

(9), a) The hydraulic holding clamp on the chassis holds the outer tube downward, sinks the tube to a set stroke, and the soil under the outer tube enters the outer tube to a certain thickness; b) the hydraulic holding clamp on the chassis The pile device passes through the horizontal beams connected together, through the ramming plate on the inner tube, back pressures the inner tube to the next stroke, and extrudes the soil in the outer tube and under the outer tube; c) alternate steps a) and b) until the inner tube The tube and outer tube are immersed to the set depth;

(10), a) The hydraulic holding and pressing pile clamp on the chassis, through the horizontal beams connected together, through the ramming plate on the inner tube, the inner tube is counter-pressured and the inner tube sinks for a stroke to extrude the soil under the inner tube. ; B) The hydraulic holding and pressing pile clamp on the chassis holds the outer pipe and sinks the pipe one stroke downwards along the inner pipe; c) Interact steps a) and b) until the inner pipe and the outer pipe sink to the set depth;

(11), a) Hydraulic pressure pile clamp on the chassis or stand, the pressure outer pipe sinks down for one stroke, and the soil under the outer pipe enters a certain thickness inside the outer pipe; b) Hydraulic pressure on the chassis The holding pressure pile clamp, through the wire ropes connected together, pulls the inner tube downwards through the ramming plate of the inner tube for one stroke, extruding the soil inside and under the outer tube; c) Interaction a), b 1) Steps until the inner and outer pipes are immersed to the set depth;

(12), a) The hydraulic pressure pile clamp on the chassis or stand, through the steel wire ropes connected together, pulls the inner tube downwards through the upper ramming plate of the inner tube for one stroke, and extrudes the inner tube downward B) The hydraulic holding and pressing pile clamp on the chassis or stand, holding and pressing the outer pipe to sink one stroke down the inner pipe; c) Interact steps a) and b) until the inner pipe and the outer pipe Immerse the tube to the set depth;

(13), a) The hydraulic holding and pressing pile clamp on the chassis or stand, the holding and pressing outer pipe sinks to a certain depth; in the case of hard soil, the weight of the pile driver cannot meet the requirements of pile pressing force, and the pipe cannot be sunk inside. The internal rammer of a certain weight is built in the tube. The internal rammer is a self-falling hammer, an electric hammer or a hydraulic hammer. Cross over until the inner tube and outer tube are immersed to the set depth.
The construction method of static pressure sinking pipe pile according to claim 1 or 2, characterized in that: the construction method of the first pile is one of the following methods:

(1) Method 1:

(1) Move the machine into place: move the construction equipment and place the drill rod on the set pile position;

(2) Spinning sinking: Spin down the drill pipe to the set depth;

(3) Rotate and pull up: Rotate and pull the drill pipe to the set height;

(4) Repeat steps (2) and (3) to punch, cut and stir the underground in-situ soil into a fine grain shape; at the same time, use at least one of air jet, water spray, grout, and sand blasting to mix with liquid Or solid curing agent, punching and cutting, spraying and stirring until the first pile meets the set requirements;

(2) Method 2:

(1) Move the machine into place: move the construction equipment and place the drill rod on the set pile position;

(2) Spinning sinking: Spin down the drill pipe to the set depth, take out all or part of the soil, and take out all or part of the underground in-situ soil;

(3) Rotating and lifting: Rotating and lifting the drill pipe to the set height;

(4) Repeat steps (1), (2), (3) to take out all or part of the underground in-situ soil, and refill the pre-mixed cement soil into the borehole until the first pile meets the set requirements.
The construction method of static pressure sinking pipe pile according to claim 1 or 2, characterized in that: the first pile is a non-borrowing in-situ cement-soil pile, a pre-mixing method of fully borrowing or partially borrowing the soil and refilling it into the ground Cement-soil pile; the first pile has one or more forms of the same diameter or reduced diameter from the group of expanding top, expanding diameter, expanding bottom, full thread, full straight line, inter-threaded and straight line along the pile body.
The construction method of the static pressure sinking pipe pile according to claim 1 or 2, characterized in that: the bottom expansion method of the first pile is mechanical expansion or hydraulic expansion, which is formed by repeated spraying and stirring.
The construction method of composite pile according to claim 1 or 2, characterized in that: the second pile is a static pressure pile, the pile body is a precast pile or a cast-in-place pile; One or more of the same diameter or variable diameter form of bottom, full thread, full straight line, inter-threaded and straight line; the bottom expansion method of the second pile is one of static pressure, internal ramming, internal striking, One or more forms.
The construction method of the static pressure sinking pipe pile according to claim 1 or 2, characterized in that: the bottom of the second pile is expanded after the sinking of the pipe or not; when the bottom needs to be expanded, the bottom is expanded first, and then the pouring and forming construction is carried out ; The construction method of pouring and forming is: lifting the inner pipe system, building the pile body or implanting the prefabricated pile body; The inner diameter of the outer pipe; the inner pipe can be used as a force-transmitting rod as well as a power rod; the inner pipe has a built-in internal rammer of a certain weight, and the inner pipe and the internal rammer form an internal rammer; the internal rammer is used as a storage and filling The ground-empty cabin for materials can also be used as a borrowing cabin for taking the in-situ soil under the inner tube; when the bottom is expanded, the filler is put into the cavity between the inner and outer tubes, the cavity of the inner tube, and the outer tube and inner tube are pulled up. Raise the inner rammer, the filling material overflows from the discharge port; according to the feeding amount, pile pressing force, vibrating force, penetration, single control, double control, three control, four control set parameters, repeated holding pressure, top pressure, Back pressure, vibratory impact, internal ramming, internal ramming, static stamping, dynamic impact filling materials are used for dynamic ramming and compaction replacement, and sealing and sealing the water to form the required enlarged head.
A static pressure sinking pipe pile construction equipment includes a static pile pressing machine and a sinking pipe system. It is characterized in that a stand is set on the chassis of the static pile press, and slide rails are set on the left and right sides of the stand, one of which is The slide rail is in sliding fit with the drill pipe mixing power head, and the other side slide rail is in conjunction with the pipe fixing device when the pipe is immersed.
The static pressure sinking pipe pile construction equipment according to claim 8, characterized in that: a hydraulic holding and pressing pile clamp for pipe holding is set on the chassis, and a hydraulic holding and pressing pile clamp for holding pipe is set on the stand ; The immersed tube system includes a steel outer tube with a set rigidity and an inner tube with a set rigidity and an inner tube hammer system.
The static pressure sinking pipe pile construction equipment according to claim 9, characterized in that: an upper ramming plate is arranged on the inner tube, and a lower ramming plate is arranged under the upper ramming plate; the diameter of the upper ramming plate is greater than or equal to the lower ramming plate Diameter ≥ outer tube diameter; outer tube length ≤ inner tube length.