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CN-116556320-B - Construction device suitable for composite pile and pile forming construction method

CN116556320BCN 116556320 BCN116556320 BCN 116556320BCN-116556320-B

Abstract

The invention relates to a construction device and a pile forming construction method suitable for a composite pile. The construction device with the inner pipe moving device and the pile forming construction method are adopted to form a novel composite pile, the novel composite pile comprises an inner pile and an outer pile, the inner pile is fully or partially wrapped by the outer pile within the length range, the inner pile is a prestressed concrete pile or a steel pile, the outer pile is composed of superfluid concrete with slump of 160-240 mm and comprises an expansion body section and a column section, one or more than two expansion body sections of the outer pile are arranged at the bottom and/or the middle and/or the top of the outer pile, the maximum outer diameter or the maximum diagonal dimension of the cross section of the inner pile is D, and the outer diameter of the expansion body section is D, so that D is more than or equal to 1.5D. The composite pile formed by the method has the advantages of energy conservation, emission reduction, better low-carbon effect, higher pile quality, large pile end resistance and stronger pile bearing capacity.

Inventors

  • LIU SHUAI
  • Xia Riguang
  • LI XIAOFENG

Assignees

  • 刘帅

Dates

Publication Date
20260512
Application Date
20230523

Claims (10)

  1. 1. The construction device suitable for the composite pile comprises a power head device (10), a concrete conversion reducing device (20), a transition reducing device (30) and a drilling tool (40), wherein the upper end of the drilling tool (40) is connected with the main shaft output end of the power head device (10) sequentially through the transition reducing device (30) and the concrete conversion reducing device (20), the construction device is characterized in that an inner pipe (50) is arranged, the inner pipe (50) is coaxially sleeved in the drilling tool (40), the upper end of the inner pipe (50) sequentially penetrates through the transition reducing device (30), the concrete conversion reducing device (20) and the upper end of a main shaft hole of the power head device (10) and is fixed with an inner pipe moving device (60), the lower end of the inner pipe (50) is connected with the lower end of the drilling tool (40) through an expanding device (70), and the inner pipe moving device (60) controls the inner pipe (50) to move up and down relative to the axial direction of the drilling tool (40), so that the expanding and retracting of the expanding device (70) are realized; the drilling tool (40) drives the inner tube (50) to rotate together, a double-opening drill tip device (80) is arranged at the bottom end of the drilling tool (40), after the inner tube (50) and the drilling tool (40) are coaxially sleeved, a ring-shaped hole cavity formed between the outer edge of the inner tube (50) and the inner wall of the core tube of the drilling tool (40) is communicated with the inner cavity (23-2) of the concrete conversion reducing (20) through the inner cavity of the transition reducing (30), forming a pouring channel of the super-fluid concrete.
  2. 2. The construction device according to claim 1, wherein the concrete conversion reducing (20) comprises a bent input pipe (21), an outer sleeve (22), an inner sleeve (23), a pressing plate (24), a fixing plate (25), rolling bodies (26) and a sealing piece (27), wherein a spline B is arranged in an inner hole of the inner sleeve (23), two transverse holes A are arranged at the upper end of the inner sleeve, the concrete conversion reducing (20) is connected with the lower end of a main shaft of the power head device (10) in a matched mode through the spline B and a pin penetrating through the transverse holes A, a plurality of channels (23-1) are arranged at the lower end of the inner sleeve (23), the channels (23-1) are communicated with an inner cavity (23-2) in the middle of the inner sleeve (23), a rotatable sealing body is formed between the outer sleeve (22) and the inner sleeve (23) through an upper rolling body (26) and a lower rolling body (27), one end of the bent input pipe (21) is fixedly connected with the inner cavity (23-2) of the inner sleeve (23) through the pressing plate (24) and bolts, the fixing plate (25) is fixedly connected with one end of the outer sleeve (22) on the other end of the outer sleeve (22), and the rotating limiting device (10) is fixedly connected with the other end of the outer sleeve (22).
  3. 3. The construction device according to claim 1, wherein the inner pipe moving device (60) comprises two groups of guide brackets (61), an oil cylinder lug plate (62), a pin (63), an oil cylinder (64), a conical guide pipe (65), an upper body (66), a lower body (67) and a ball body (68), wherein circumferential tracks for the ball body (68) to run are respectively arranged on the upper surface and the lower surface of a circular plate (51) arranged at the upper end of the inner pipe (50), the circumferential tracks are assembled with the upper body (66), the lower body (67) and the ball body (68) together with bolts to form a revolute pair, symmetrical protruding parts of the upper body (66) and the lower body (67) fastened into a whole form positioning cooperation with an inner groove of the two groups of guide brackets (61) respectively, the two oil cylinders (64) are fixed on the two groups of guide brackets (61) respectively, piston rod ends of the oil cylinders (64) are hinged with the oil cylinder lug plate (62) fixed on the upper body (66) through the pin (63), bottom ends of the two groups of the guide brackets (61) are fixed on the power head device (10) respectively, and the lower ends of the guide pipe (65) are fixed on the upper body (50) in the same diameter.
  4. 4. The construction device according to claim 1, wherein the diameter enlarging device (70) comprises two or three groups of diameter enlarging structures which are symmetrically or uniformly arranged, the diameter enlarging structures comprise a hinge shaft I (71), a connecting rod seat I (72), a connecting rod I (73), a hinge shaft II (74), a connecting rod II (75), a connecting rod seat II (76) and a hinge shaft III (77), the connecting rod seat I (72) is fixed on the outer wall of the lower end part of a core tube (41) of the drilling tool (40), the lower end of the connecting rod I (73) is hinged with the connecting rod seat I (72) through the hinge shaft I (71), the upper end of the connecting rod I (73) is hinged with the lower end of the connecting rod II (75) through the hinge shaft II (74), the upper end of the connecting rod II (75) is hinged with the connecting rod seat II (76) fixed on the outer wall of the lower end part of the inner tube (50), and the core tube (41) and the spiral blades at positions corresponding to the connecting rod I (73) and the connecting rod II (75) are provided with notches for enlarging the diameter enlarging device (70) and required retraction.
  5. 5. Construction device according to claim 1, wherein the double-opening drilling tip device (80) is a drilling tip plate (81), a plug plate I (82), a shaft (83), an ear plate seat (84), a plug plate II (86) and a drilling tip plate II (87); the two groups of ear plate seats (84) are symmetrically arranged on the outer wall of the lower end of the core tube (41) of the drilling tool (40), one side upper parts of the drill tip plate I (81) and the drill tip plate II (87) are respectively matched with the inner shelves of the two groups of ear plate seats (84) and hinged through a shaft (83), the drill tip plate I (82) and the drill tip plate II (86) are respectively two-step semicircular plates and are respectively fixed with the drill tip plate I (81) and the drill tip plate II (87), the drill tip plate I (81) and the drill tip plate II (87) are respectively half of an integral drill tip plate, a groove C is arranged at the end face of the drill tip plate I (81), a lug D is arranged at the end face of the drill tip plate II (87) corresponding to the groove C, the drill tip plate I (81) is provided with a lug D, the drill tip plate I (82) and the drill tip plate II (87) are respectively rotated around the shaft (83) to close or open the lower port of the core tube (41), the groove C is matched with the lug D in an inlaid manner, the drill tip plate I (82) and the drill tip plate II (86) are respectively formed into a complete circle, and small-diameter bosses of the blocking plate I (82) and the blocking plate II (86) are in circumferential positioning fit with an inner hole at the lower end of the core tube (41).
  6. 6. A composite pile forming construction method, characterized in that the construction method comprises the following steps by using the construction device according to any one of claims 1 to 5: 1) The pile machine for assembly construction is provided with a power head device (10), a concrete conversion reducing device (20), a transition reducing device (30), a drilling tool (40), an inner pipe (50), an inner pipe moving device (60), an expanding diameter device (70) and a double-opening drilling tip device (80), wherein the inner pipe moving device (60) is communicated with a pile machine hydraulic control device through a high-pressure oil pipe, a concrete conveying pump is communicated with the concrete conversion reducing device (20) through a concrete conveying pipe, the expanding diameter device is in a retraction state, the double-opening drilling tip device is in a closing state, the drilling tip is aligned with a pile hole site, and the drilling tool is straightened; 2) Starting a pile machine and a power head device, wherein the power head device drives a drilling tool to rotate in a downward drilling direction, and under the action of the rotating drilling tool, part of soil at a pile hole site is extruded into the pile hole wall, the rest of soil is conveyed to the surface outside the hole through a helical blade on the rotating drilling tool, and part of soil is extruded and drilled to the design standard depth of a composite pile outside the pile; 3) Lifting the drill, pressing and pouring concrete, and placing an inner pile; 4) And applying vertical pressure to the partially exposed inner piles by using inner pile conveying equipment, and conveying the inner piles downwards until the height of the inner piles meets the design pile top elevation of the composite pile, thereby completing the construction of the composite pile.
  7. 7. A composite pile forming construction method according to claim 6, wherein the step 3) comprises the steps of keeping the drilling tool (40) rotating, pressing and pouring concrete to the bottom of the bore of the drilling tool, then slowly lifting the drilling tool, pressing and pouring the concrete to the bottom of the bore of the outer pile to form a 500-1000 mm concrete cylinder section (102), starting the hydraulic control system, pushing the inner pipe (50) to move downwards through the inner pipe moving device (60), driving the diameter expanding device (70) to open, making the diameter expanding device (70) to make the diameter expansion rotation, pressing and pouring the concrete in the bore wall of the formed diameter expanding bore by pressing and pouring, conveying the concrete which is not pressed and poured into the bore wall in the diameter expanding process from bottom to top along the spiral blade of the rotating drilling tool, lifting and expanding the diameter, pressing and pouring to the top of the first diameter expanding section (101), lifting the inner pile (90) through a lifting appliance, penetrating the inner cavity of the inner pipe (50), unloading the inner pipe (50) by means of the inner pipe moving device (60) to self-reset the inner cavity of the inner pipe (90), driving the diameter expanding section (101) to move to the top of the diameter expanding section (101) by pressing and driving the diameter expanding section (101) to open, continuing to start the diameter expanding section (70) to move, starting the diameter expanding section (101) to move until the diameter expanding section is closed, and the diameter expanding section is continuously driven to move up, and the core parts of the formed second column section (102) and the second enlarged body section (101) are the inner piles (90), and the column section (102) and the enlarged body section (101) are repeatedly constructed in sequence until the top of the concrete outer pile (100) is higher, so that the concrete outer pile (100) concentrically wraps the inner piles (90), and part of the inner piles (90) are exposed above the pile top ends of the cast-in-situ concrete outer pile (100), and the pile tops of the exposed inner piles (90) are higher than the pile top design elevation of the composite pile.
  8. 8. The method of construction of composite pile according to claim 6, wherein step 3) comprises the steps of holding the drilling tool (40) in rotation, pressing and pouring concrete, simultaneously starting the hydraulic control system, driving the diameter enlarging device (70) to open by the inner pipe moving device (60), slowly lifting the drilling tool, pressing and opening the double-opening drilling tip device (80) by concrete, pressing and pouring into the hole bottom and the diameter enlarging cavity of the outer pile to form a first enlarged body section (101), starting the inner pipe moving device (60), driving the diameter enlarging device to retract, lifting and pressing and pouring into a cylinder section (102), stopping lifting and pouring, lifting and pouring by lifting the inner pile (90), penetrating the inner pipe (50) cavity, placing in the concrete at the bottom end cavity of the drilling tool by means of the self weight of the inner pile (90), unloading the lifting tool, driving the diameter enlarging device (70) again to open, continuing lifting and expanding, pressing and pouring to the top end of the second enlarged body section (101), starting the diameter enlarging device (70), continuing lifting and pressing and pouring to the top end of the second enlarged body section (102), forming the second enlarged body section (101), and the top end section (100) as the inner pile, and repeatedly lifting and pouring the inner pile (90) into the top end of the inner pile (100), and part of the inner piles (90) are exposed above the pile top ends of the cast-in-situ concrete outer piles (100), and the pile tops of the exposed inner piles (90) are higher than the pile top design elevation of the composite piles.
  9. 9. A composite pile formed by a pile forming construction method according to claim 6, 7 or 8 is characterized by comprising an inner pile (90) and an outer pile (100), wherein the inner pile (90) is fully or partially wrapped by the outer pile (100) within the length range, the inner pile (90) is a prestressed concrete pile or a steel pile, the outer pile (100) is formed by superfluid concrete with slump of 160-240 mm and comprises an enlarged body section (101) and a column section (102), one or more than two enlarged body sections (101) of the outer pile (100) are arranged at the bottom and/or the middle and/or the top of the outer pile, the maximum outer diameter or the maximum diagonal dimension of the cross section of the inner pile (90) is D, and the outer diameter of the enlarged body section (101) is D, so that D is more than or equal to 1.5D.
  10. 10. A composite pile according to claim 9, characterised in that the super-fluid concrete is fine stone concrete or fine aggregate concrete with a concrete strength grade of C15 or C20 or C25 or C30.

Description

Construction device suitable for composite pile and pile forming construction method Technical Field The invention belongs to the field of construction of building piles, and particularly relates to a construction method of a composite pile. Background In the building pile foundation, the foundation soil bearing capacity characteristic value is not more than a soil layer of 260kPa, the cement soil composite pile occupies a certain share, and on bearing, the cement soil composite pile changes the end bearing friction pile of the small pile diameter and the long pile body of the traditional static pressure precast pile into the end bearing friction pile of the large pile diameter and the short pile body, thereby realizing the effects of energy conservation and carbon reduction. The bearing capacity of the cement-soil composite pile mainly comprises friction between an outer pile (cement-soil pile) and surrounding soil, meanwhile, the bonding strength between the outer pile (cement-soil pile) and an inner pile (precast pile) can be influenced by a plurality of factors such as soil property, cement slurry injection amount, stirring technology, stirring time, groundwater and the like, and sometimes, the inner pile (precast pile) and the outer pile (cement-soil pile) are combined with each other in an infirm manner, and when the top of the inner pile (precast pile) is pressed, the inner pile (precast pile) and the outer pile (cement-soil pile) are caused to generate relative displacement, so that the pile quality stability of the cement-soil composite pile is poor. According to the technical Specification of building pile foundation, JGJ94-2008, the standard value q pk of the limiting end resistance of the same soil layer is 20-40 times, even higher, than the standard value q sik of the limiting side resistance. Disclosure of Invention Aiming at the problems of the existing cement soil composite pile and the existing construction deficiency, the invention provides a composite pile and a pile forming construction method thereof. The formed composite pile has the advantages of energy conservation, emission reduction, better low-carbon effect, higher pile quality, large pile end resistance and stronger pile bearing capacity. The invention adopts the technical scheme that the construction device suitable for the composite pile comprises a power head device, a concrete conversion diameter-changing device, a transition diameter-changing device and a drilling tool, wherein the upper end of the drilling tool is connected with the output end of a main shaft of the power head device through the transition diameter-changing device and the concrete conversion diameter-changing device in sequence, an inner pipe is arranged in the drilling tool in a coaxial sleeving manner, the upper end of the inner pipe penetrates through the transition diameter-changing device, the concrete conversion diameter-changing device and the upper end of a main shaft hole of the power head device in sequence and is fixed with an inner pipe moving device, the lower end of the inner pipe is connected with the lower end of the drilling tool through an expanding device, the inner pipe moving device controls the inner pipe to move up and down relative to the axial direction of the drilling tool to realize the expanding and retracting of the expanding device, the drilling tool drives the inner pipe to rotate together, a double-opening drilling tip device is arranged at the bottom end of the drilling tool, and an annular cavity formed between the outer edge of the inner pipe and the inner wall of a core pipe is communicated with the inner cavity of the concrete conversion diameter-changing device through an inner cavity formed by the transition diameter-changing after the inner pipe and the drilling tool are coaxially sleeved. The construction device comprises a curved input pipe, an outer sleeve, an inner sleeve, a pressing plate, a fixing plate, rolling bodies and sealing pieces, wherein a spline B is arranged in an inner hole of the inner sleeve, two transverse holes A are formed in the upper end of the inner sleeve, the concrete is matched and connected with the lower end of a main shaft of a power head device through the spline B and a pin penetrating through the transverse holes A, a plurality of channels are formed in the lower end of the inner sleeve, the channels are communicated with an inner cavity in the middle of the inner sleeve, a rotatable sealing body is formed between the outer sleeve and the inner sleeve through the upper and lower rolling bodies and the sealing pieces and is fastened through the pressing plate and the bolts, one end of the curved input pipe is fixedly connected with the inner cavity in the middle of the inner sleeve after being fixed with the outer sleeve, and one end of the fixing plate is fixedly arranged on an outer cylindrical surface of the outer sleeve while the other end of the fixing plate is fixedly connected