CN108118693B - Construction device for cast-in-situ concrete core cement-soil mixing pile - Google Patents
Construction device for cast-in-situ concrete core cement-soil mixing pile Download PDFInfo
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- CN108118693B CN108118693B CN201810105089.6A CN201810105089A CN108118693B CN 108118693 B CN108118693 B CN 108118693B CN 201810105089 A CN201810105089 A CN 201810105089A CN 108118693 B CN108118693 B CN 108118693B
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- 238000002156 mixing Methods 0.000 title claims abstract description 83
- 239000002689 soil Substances 0.000 title claims abstract description 76
- 239000004567 concrete Substances 0.000 title claims abstract description 32
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 26
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 239000004568 cement Substances 0.000 claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 abstract description 4
- 230000015271 coagulation Effects 0.000 abstract description 3
- 238000005345 coagulation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- -1 Polyethylene Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000009474 hot melt extrusion Methods 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Structural Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a construction device of a cast-in-situ concrete core cement mixing pile, which belongs to the field of soft soil foundation reinforcement, and the construction device is a multifunctional cement mixing pile machine formed by a machine body, a power head, a drill rod and the like, wherein the drill rod is an upper drill rod and a lower drill rod which are connected with each other, a corrugated pipe and a drill bit are detachably arranged in the lower drill rod through a fastening component, after the construction of the cement mixing pile is completed, the corrugated pipe and the drill bit are synchronously kept in the center by utilizing the vibration rising of the drill rod, and after cement is initially set, a concrete core is cast in the corrugated pipe to form a stiff core pile. Therefore, through the structure, the construction of the cement-soil mixing pile and the stiff core pile can be completed once only by one pile, the quality of the cement-soil mixing pile which is formed by mixing is not affected, the coagulation forming of cement-soil is not disturbed, the cement-soil is not pushed to cause the non-uniformity of the cement-soil, and the cement-soil mixing pile has the advantages of reasonable structure, convenience in construction, reliable quality, economy and the like.
Description
Technical Field
The invention relates to the field of soft soil foundation reinforcement, in particular to a construction device of a cast-in-situ concrete core cement-soil mixing pile.
Background
The cement soil mixing pile is formed by mixing cement paste or cement powder and soft soil in situ by using a cement mixing pile machine, and columnar cement soil is formed after mixing, and cement and soft soil generate a series of physical-chemical reactions to harden and modify the soft soil. The strength of the modified soft soil is far greater than that of the natural soft soil, and the compressibility and the water permeability of the modified soft soil are greatly reduced compared with those of the natural soft soil. Because the cement-soil mixing pile is formed by cement and soil through various physical and chemical reactions, the compression deformation of the pile body is large, the strength is only between the soil and the cement body, the strength of the cement-soil mixing pile cannot reach the design requirement, and the shear strength is low near the ground surface, so that the engineering requirement cannot be met.
In the middle 70 th century, a stiff material such as reinforced concrete, steel and the like is inserted into the center of a cement-soil mixing pile to form a stiff core pile, and the core pile is inserted into the stiff core pile before the cement-soil mixing pile is initially set to form a novel pile type composite stressed pile. The pile type foundation treatment method utilizes the larger contact area of the cement-soil mixing pile to provide side friction resistance, and utilizes the high-strength core pile to bear vertical load, so that the advantages of the two pile types are better exerted at the same time, and the foundation treatment method is economical and effective. The cement soil mixing pile of the stiff core pile is researched and tested at home in the middle 80 s of the 20 th century, and is still under deep research and popularization at present.
There are three main methods for forming a stiff core pile in a cement-soil mixing pile: firstly, the stiff core pile is inserted by static pressure or vibration mode, namely the construction method is similar to the construction method of 'SMW' (Soil Mixing Wall) in Japan; secondly, a method of inserting the stiffening core mould and then pouring cement concrete is adopted, namely the disclosed Chinese patent number is ZL201120340788.2, and the name is 'plastic sleeve concrete pile stiffening core rigid-flexible integrated combined pile'; thirdly, a long spiral drilling machine or a Luoyang shovel is adopted to draw holes in the cement-soil mixing pile to the designed depth, and a reinforcement cage is inserted to pour cement concrete. For the cement mixing pile, the first and second methods are substantially the same, and the stiff core pile is inserted into the stiff core pile or the stiff core mould which is prefabricated before the cement mixing pile is initially set, so that adverse effects are generated on the cement mixing pile which is formed by mixing to a certain extent, such as disturbance of coagulation forming of cement, non-uniformity caused by pushing of cement, difficulty in achieving expected pile body arrangement of soil after expansion and extrusion, and the like; the method III has the advantages that the quality of the cement-soil mixing pile is affected by digging holes in the cement-soil mixing pile, the efficacy is low, and the quality is difficult to control.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a construction device of the cast-in-situ concrete core cement-soil mixing pile, which has the advantages of reasonable structure, convenient construction, reliable quality and economy.
The technical problems of the invention are realized by the following technical scheme:
the construction equipment of a kind of cast-in-situ concrete core cement mixing pile, it is a multi-functional cement mixing pile machine, it includes fuselage, lifting rope, power head and hollow structural drilling rod, there are grouting tube groups to blowout cement paste to the bottom of drilling rod in the drilling rod, the external surface of the drilling rod has stirring pieces, the stirring piece is driven by the drilling rod to rotate and mix and stir cement paste and soil mass and form the cement mixing pile in the soft soil layer; the drill rod consists of an upper drill rod and a lower drill rod which are connected with each other; the lower drill rod is internally provided with a movably sleeved corrugated pipe, the bottom end of the lower drill rod is provided with a drill bit, and the top surface of the drill bit is fixed at the lower end of the corrugated pipe in a sealing way and is in airtight contact with the bottom end of the lower drill rod; the top of the lower drill rod is provided with a fastening component for detachably mounting the corrugated pipe and the drill bit in the lower drill rod; the top end of the upper drill rod is connected with a power head, and a water injection pipe for injecting water into the corrugated pipe is arranged in the upper drill rod; after the cement mixing pile is formed, the corrugated pipe and the drill bit are synchronously reserved in the center of the cement mixing pile, and a concrete core is cast in situ in the corrugated pipe.
When the drill rod starts to ascend and the corrugated pipe is left in the cement soil mixing pile, the corrugated pipe is subjected to the combined action of cement soil and water pressure, and the strength of the corrugated pipe is calculated by a formula I; the second formula calculates that the corrugated pipe is deformed at the moment, the gap between the outer wall of the corrugated pipe and the inner wall of the drill rod is also changed, the first formula and the second formula are used as the basis for selecting the material and the size of the corrugated pipe, and the first formula and the second formula are as follows:
equation one,
Formula II,
，
Then
In the first formula and the second formula
-pressure of water and soil cement against the bottom section of the bellows, < - > a->；
The effective length of the corrugated pipe embedded in the cement mixing pile, namely the water injection height of the corrugated pipe, < ->；
-volume weight of water, jersey>；
-volume weight of cement soil, < - > j->；
The lateral pressure coefficient before the initial setting of the cement soil is dimensionless, and is determined by a test, and 0.4 to 0.6 is taken when no test data exists;
-hoop tension applied to the bellows circular section, +.>；
-calculated radius of bellows, +.>；
-the angle between any point of the circumference of the circular section of the bottom surface of the bellows and the horizontal axis, +.>；
-hoop tensile stress on the bellows bottom circular section, +.>Wherein 1 is the unit height, < >>；
-bellows circular section calculation wall thickness, < >>；
-the bellows ring section material is tolerant of tensile stress, < ->；
-calculating the perimeter of the bellows bottom section, +.>；
-calculated perimeter elongation of the bellows bottom section under the pressure of water and soil cement, < ->；
-calculated radius of bellows, +.>；
-the bellows bottom section calculates the radius increment under the pressure of water and soil cement,/->，/>The increase of (2) possibly pressing the inner wall of the drill rod, the proper clearance between the outer diameter of the corrugated pipe and the drill rod, the wall thickness of the corrugated pipe and the elastic modulus parameters are selected, and the increment of the calculated radius of the corrugated pipe is not increased +.>The increase of the diameter of the corrugated pipe is 2 mm-4 mm, which is used for clamping the drill rod to influence the retention of the corrugated pipe;
the expansion increment of the bottom section of the corrugated pipe in the circumferential direction unit perimeter under the pressure action of water and cement soil is dimensionless, namely strain;
-modulus of elasticity of bellows, < >>；
Wave-shapeDesign allowance of the radius increment of the bellows calculation, < +.>。
The fastening component comprises a pull rod arranged in the corrugated pipe, the lower end of the pull rod is detachably connected to the drill bit, and the upper end of the pull rod is provided with a pull rod ring; the upper end of the corrugated pipe is provided with a pull rod bolt which horizontally passes through the pull rod ring, the pull rod, the corrugated pipe and the drill bit are integrated, and the two ends of the pull rod bolt respectively pass through and are arranged in a chute which vertically extends from the side wall of the lower drill rod; the lower drill rod is externally provided with a hoop which is detachably and tightly attached to the lower part of the pull rod bolt, the hoop is tightly held outside the lower drill rod, and the lifting and moving positions of the two ends of the pull rod bolt in the sliding groove are positioned.
The upper drill rod bottom and the lower drill rod top between be equipped with interconnect's flange, two the spout set up in the flange below on lower drill rod top to the axle center of lower drill rod sets up on the lateral wall of lower drill rod as central symmetry, the vertical extension length of every spout is 1~ 2mm, the width is greater than the diameter of pull rod bolt 1mm ~2mm, the both ends of this pull rod bolt are done lift along the spout and are removed, and drive bellows and drill bit and do synchronous lift in lower drill rod.
The pull rod is a steel round rod and is arranged at the axle center of the lower drill rod and the corrugated pipe, the lower end of the pull rod is provided with a pull rod bolt which is detachably connected to the drill bit, and the pull rod ring is an integrally formed round ring at the upper end of the pull rod.
The pull rod bolt is a steel round rod, one end of the pull rod bolt is nut-shaped, the other end of the pull rod bolt is provided with a bolt hole, and after sequentially penetrating through the chute on one side of the lower drill rod, the pull rod ring and the chute on the other side of the lower drill rod, the bolt is inserted into the bolt hole for temporary fixation.
The anchor ear is formed by connecting left and right semicircular plates in a butt joint way, wing plates are arranged on the left and right semicircular plates, and fastening bolts for holding the anchor ear are arranged on the wing plates.
Compared with the prior art, the invention mainly designs a multifunctional cement mixing pile machine, which is characterized in that a drill rod of the cement mixing pile machine is formed by adopting an upper drill rod and a lower drill rod which are connected with each other, and a corrugated pipe and a drill bit are detachably arranged in the lower drill rod through a fastening component to form an integral part. Therefore, through the cement mixing pile machine with novel structure, the construction of the cement mixing pile and the stiff core pile can be completed at one time only by one cement mixing pile machine, the quality of the cement mixing pile formed by mixing is not affected, the coagulation forming of the cement is not disturbed, the cement is not pushed to cause the non-uniformity of the cement, and the cement mixing pile machine has the advantages of reasonable structure, convenience in construction, reliable quality, economy and the like.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is an enlarged view at a of fig. 1.
Fig. 3 is a sectional view of B-B of fig. 2.
Fig. 4 is a schematic view of the connection structure at the drill bit.
Fig. 5 is a schematic structural view of a bellows.
Fig. 6 is a graph of bellows stress and deformation calculations.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings.
1-6, 1.soft soil layer, 2.cement mixing piles, 3.cast-in-place concrete core, 4.corrugated pipe, 41.exhaust hole, 5.cement mixing pile machine, 51.fuselage, 52.lifting rope, 53.power head, 54.locating clamp, 55.drill pipe, 551.upper drill pipe, 552.lower drill pipe, 553.flange, 56.stirring blade, 57.drill bit, 58.pull rod, 581.pull rod ring, 582.pull rod bolt, 583.pull rod bolt, 584.plug, 585.water injection pipe, 59.grouting pipe group, 591.vertical grouting pipe, 592.annular grouting pipe, 593.grouting head, 6.anchor ear and 61.chute.
The construction device is shown in figure 1, and concretely relates to a multifunctional cement mixing pile machine, wherein a cement mixing pile 2 is a main agent which uses cement as a curing agent and is an effective form of soft foundation treatment, and cement slurry is sprayed into soil by using the cement mixing pile machine 5 and fully mixed, so that the cement and soft soil are subjected to a series of physical and chemical reactions, and the soft soil is hardened into cement soil to improve the foundation strength.
The multifunctional cement mixing pile machine consists of a machine body 51, a lifting rope 52, a power head 53, a positioning clamp 54, a drill rod 55 with a hollow structure, a grouting pipe group 59 which is arranged in the drill rod and ejects cement paste to the bottom end of the drill rod, a mixing blade 56 which is arranged on the outer surface of the drill rod 55, and the like.
The main body 51 is a main supporting and moving part of the cement mixing pile machine 5; the lifting rope 52 is a steel wire rope, one end of the lifting rope is connected with the winch of the machine body 51, the other end of the lifting rope is wound around the pulley block at the top of the machine body to suspend the power head 53, the upper end of the drill rod 55 is vertically arranged at the bottom of the power head 53, and the power head 53 and the drill rod 55 are driven to move up and down through the lifting rope 52 by winding or releasing the winch, so that the stirring and grouting sinking and rising effects of the cement stirring pile machine 5 are achieved.
The power of the power head 53 has the functions of rotation and vibration, and is also a power source for the operation of parts such as the drill rod 55, and the drill rod 55 can be driven to rotate when sinking and rising; when the reserved corrugated pipe 4 ascends after the cement mixing pile 5 is sprayed, the vibration driving drill rod 55 overcomes the cohesive force of the soft soil of the mixing pile, and meanwhile, the damage of the mixing piece 56 to the pile body of the cement mixing pile 2 is reduced or avoided.
The positioning clamp 54 is a rigid component for connecting the machine body 51 and the drill rod 55, the height and the horizontal position of the positioning clamp 54 can be adjusted before the drill rod is positioned, and once the drill rod 55 is accurately positioned, the drill rod can horizontally rotate and vertically move up and down in the positioning clamp 54.
The stirring plate 56 is a sheet-shaped steel structure for stirring soft soil, and is fixed on the outer circumferential surface of the lower part of the drill rod 55 by various shapes, lengths and plum blossom shapes, and when the drill rod rotates, the stirring plate 56 rotates to stir the soft soil, so that the stirring plate is uniformly mixed with cement paste sprayed into the soft soil layer 1, and the cement soil stirring pile 2 is formed.
The corrugated pipe 4 and the drill bit 57 are arranged in the drill pipe 55, and after the construction of the cement-soil mixing pile 2 is completed and the drill pipe 55 is lifted, the corrugated pipe can be synchronously remained in the center of the cement-soil mixing pile 2 and the concrete core 3 can be cast in situ, so that a stiff core pile with much higher strength and rigidity than the cement-soil mixing pile is formed.
The drill rod 55 is a steel hollow pipe and consists of an upper drill rod 551 and a lower drill rod 552, the top end of the upper drill rod 551 is connected with a power head 53, a water injection pipe 585 is arranged in the upper drill rod 551, one end of the water injection pipe is exposed from the side wall of the drill rod 55 and is communicated with a water pump, the other end of the water injection pipe 585 is positioned above the corrugated pipe 4 and can be used for injecting water into the corrugated pipe, and the bottom end of the upper drill rod 551 is provided with a flange 553; the top end of the lower drill rod 552 is also provided with a flange 553, so the upper drill rod 551 and the lower drill rod 552 are connected through the flange 553; the bellows 4 is movably sleeved in the lower drill rod 552, and the drill bit 57 is arranged at the bottom end of the lower drill rod 552.
The corrugated pipe 4 is a double-wall hollow pipe with an outer wall and a smooth inner wall of an annular structure formed by hot melt extrusion, and the outer diameter of the double-wall hollow pipe is 2-4 mm smaller than the inner diameter of a drill rod, wherein Polyethylene (PE) or polypropylene (PP) or high-density polyethylene (HDPE) is used as a main raw material; the side wall of the top of the corrugated pipe is provided with the vent hole 41 shown in fig. 5 for exhausting when the water is injected into the corrugated pipe 4, so that after the water is injected into the corrugated pipe 4, the corrugated pipe can be prevented from being extruded and deformed by the cement-soil mixing pile 2 which is not initially set, the downward gravity of the corrugated pipe 4 can be increased, and the situation that the corrugated pipe 4 and the drill bit 57 are difficult to keep in the rising process of the drill pipe 55 is avoided; the corrugated pipe 4 can also adopt a steel band reinforced polyethylene spiral corrugated pipe, and when the single length is insufficient, the connection modes of hot melt extrusion welding, electric melting band connection, shrinkage pipe connection, clamping hoop and the like specified by the current standards can be adopted.
The drill bit 57 is funnel-shaped and made of the same material as the corrugated pipe 4, the bottom end of the lower drill rod 552 is tightly and closely contacted with the top surface of the drill bit 57 as shown in fig. 4 without water leakage, and the lower end of the corrugated pipe 4 is bonded, sealed and fixed with the top surface of the drill bit 57 by epoxy resin to play a role in sealing the corrugated pipe 4, so that water is not leaked when water is injected into the corrugated pipe; when the cement mixing pile 2 is completed and the corrugated pipe 4 is left after the drill pipe 55 is pulled out, the drill bit 57 and the corrugated pipe 4 are synchronously left in the cement mixing pile 2 to serve as the cast-in-situ concrete core 3.
When the drill rod 55 starts to ascend to leave the corrugated pipe 4 in the cement mixing pile 2, the strength of the corrugated pipe 4 is calculated by a formula I under the combined action of cement and water pressure; the second formula calculates that the bellows 4 is deformed at this time, the gap between the outer wall of the bellows and the inner wall of the drill pipe 55 is also changed, and the first and second formulas are used as the basis for selecting the material and the size of the bellows 4, and the formulas are as follows:
equation one,
Formula II,
，
Then
In the first formula and the second formula
-pressure of water and cement soil against the bottom section of bellows 4, +.>；
The effective length of the bellows 4 embedded in the cement mixing pile 2, i.e. the height of the bellows 4 filled with water,/->；
-volume weight of water, jersey>；
-volume weight of cement soil, < - > j->；
The lateral pressure coefficient before the initial setting of the cement soil is dimensionless, and is determined by a test, and 0.4 to 0.6 is taken when no test data exists;
-hoop tension exerted on the circular section of bellows 4->；
-calculated radius of bellows 4, +.>；
-the angle between any point of the circumference of the circular section of the bottom surface of the bellows 4 and the horizontal axis, +.>；
-the hoop tensile stress to which the bellows 4 base ring section is subjected, +.>Wherein 1 is the unit height, < >>；
-calculating the wall thickness of the bellows 4 circular section, < >>；
-the bellows 4 circular section material allows for tensile stress, +.>；
-bellows 4 bottom section calculation perimeter, +.>；
-calculated perimeter elongation of the bottom section of bellows 4 under the pressure of water and soil cement, < ->；
-calculated radius of bellows 4, +.>；
-the bottom section of bellows 4 calculates the radius increment under the pressure of water and soil cement,/->，/>The increase of (2) possibly squeezes the inner wall of the drill rod 55, and the appropriate gap between the outer diameter of the corrugated pipe 4 and the drill rod 55, the wall thickness of the corrugated pipe 4 and the elastic modulus parameter are selected, so that the increment of the calculated radius of the corrugated pipe is avoided>The increase of the diameter of the corrugated pipe 4 is 2 mm-4 mm, which is used for clamping the drill rod 55 to influence the retention of the corrugated pipe;
the expansion increment of the circumferential unit perimeter of the bottom section of the corrugated pipe 4 under the pressure action of water and cement soil is dimensionless, namely strain;
-modulus of elasticity of bellows 4 +.>；
-bellows 4 calculate the design allowance of the radius increment,/->。
The cement slurry in the soft soil layer 1 is mainly sprayed out from a grouting pipe group 59 in the drill pipe 55 to the bottom end of the drill pipe 55, and the grouting pipe group 59 comprises two vertical grouting pipes 591 symmetrically fixed on the outer wall of the drill pipe 55 and an annular grouting pipe 592 arranged at the bottom end of the drill pipe 55 and positioned above the drill bit 57; the upper end of the vertical grouting pipe 591 is externally connected with curing agent conveying pumps such as cement paste, the lower end of the vertical grouting pipe 591 is communicated with an annular grouting pipe 592, 3-4 symmetrically distributed grouting heads 593 are arranged on the annular grouting pipe, and the curing agent conveying pumps can spray cement paste from the grouting heads 593 through the grouting pipe group 59.
The lower drill rod 552 has a fastening unit at its top for detachably mounting the bellows 4 and the drill bit 57 in the lower drill rod 552, and the fastening unit is mainly composed of a tie rod 58, a tie rod bolt 583, a hoop 6, and the like as shown in fig. 2 and 3.
The pull rod 58 is a steel round rod and is arranged at the axes of the lower drill rod 552 and the corrugated pipe 4, the lower end of the pull rod 58 is detachably connected with the drill bit 57 through a pull rod bolt 582, and the upper end of the pull rod 58 is an integrally formed round pull rod ring 581.
The pull rod bolts 583 are steel round rods and are arranged at the upper end of the corrugated pipe 4, one end of each pull rod bolt is nut-shaped, bolt holes are formed in the other end of each pull rod bolt, two sliding grooves 61 are formed in the side wall below the flange 553 at the top end of the lower drill rod 552, the two sliding grooves are symmetrically arranged by taking the axis center of the lower drill rod 552 as the center, the vertical extension length of each sliding groove 61 is 1-2 m, the width of each sliding groove is 1-2 mm larger than the diameter of the pull rod bolt 583, the pull rod bolts are inserted from the sliding groove 61 at one side of the lower drill rod 552, then horizontally penetrate through the pull rod rings 581 and then penetrate out from the sliding groove 61 at the other side of the lower drill rod 552, bolts 584 are inserted into the bolt holes to be temporarily fixed, and then the pull rod 58, the corrugated pipe 4 and the drill bit 57 are formed into a whole through the pull rod bolts 583, and the two ends of the pull rod bolts 583 are just located in the two sliding grooves 61.
The hoop 6 is detachably attached to the outside of the lower drill rod 552 at the lower part of the pull rod bolt 583, the hoop 6 is tightly attached to the outside of the lower drill rod 552, the lifting and moving positions of the two ends of the pull rod bolt 583 in the sliding groove 61 are positioned, the hoop 6 is formed by joining two left and right semi-circular hoops after being joined, the wing plates of the hoop 6 are provided with fastening bolts, and the hoop can be tightly fixed on the lower drill rod 552 after being tightly held, so that the pull rod 58, the pull rod bolt 583, the corrugated pipe 4 and the drill bit 57 are temporarily fixed. When the anchor ear 6 is detached, both ends of the pull rod bolt 583 can move up and down in the sliding groove 61, and the bellows 4 and the drill bit 57 are driven to move up and down synchronously in the lower drill rod 552.
Therefore, the construction device can cast-in-situ concrete core 3 in the concrete mixing pile 2, in order to ensure that the axial force of the pile end of the cast-in-situ concrete core can be sufficiently diffused when being transmitted to a bearing layer through the cement mixing pile 2, the cast-in-situ concrete core 3 with high strength can not pierce the bottom end of the cement mixing pile 2, the length of the cast-in-situ concrete core 3 is 1 m-1.5 m shorter than that of the cement mixing pile, the ratio of the diameter of the cast-in-situ concrete core to the diameter of the cement mixing pile is not less than 0.3, the thickness of the cement covered by the cast-in-situ concrete core is not less than 120mm, the length-width ratio of the cast-in-situ concrete core is not more than 80, and the cast-in-situ concrete core is formed by directly pouring cement concrete, and a reinforcement cage can be configured according to requirements.
The examples of the present invention are only for illustrating the present invention and are not intended to limit the scope of the present invention. It is also to be understood that various changes and modifications may be made by one skilled in the art after reading the teachings of the invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (7)
1. The construction device of the cement mixing pile of the cast-in-situ concrete core is a multifunctional cement mixing pile machine, which comprises a machine body (51), a lifting rope (52), a power head (53) and a drill rod (55) with a hollow structure, wherein a grouting pipe group (59) for spraying cement paste to the bottom end of the drill rod (55) is arranged in the drill rod, a stirring sheet (56) is arranged on the outer surface of the drill rod (55), and is driven by the drill rod (55) to rotate so as to mix and stir cement paste and soil in a soft soil layer (1) and form a cement mixing pile (2), and is characterized in that the drill rod (55) consists of an upper drill rod (551) and a lower drill rod (552) which are connected with each other; the lower drill rod (552) is internally provided with a movably sleeved corrugated pipe (4), the bottom end of the lower drill rod (552) is provided with a drill bit (57), and the top surface of the drill bit is fixed at the lower end of the corrugated pipe (4) in a sealing way and is in airtight contact with the bottom end of the lower drill rod (552); the top of the lower drill rod (552) is provided with a fastening component for detachably mounting the corrugated pipe (4) and the drill bit (57) in the lower drill rod (552); the top end of the upper drill rod (551) is connected with a power head (53), and a water injection pipe (585) for injecting water into the corrugated pipe (4) is arranged in the upper drill rod (551); after the cement mixing pile (2) is molded, the corrugated pipe (4) and the drill bit (57) are synchronously reserved in the center of the cement mixing pile (2), and the concrete core (3) is cast in situ in the corrugated pipe (4).
2. The construction equipment of the cast-in-situ concrete core cement mixing pile according to claim 1, wherein when the drill pipe (55) starts to rise to leave the corrugated pipe (4) in the cement mixing pile (2), the strength of the corrugated pipe (4) is calculated by the formula one under the combined action of cement and water pressure; the second formula calculates that the corrugated pipe (4) is deformed at the moment, the gap between the outer wall of the corrugated pipe and the inner wall of the drill rod (55) is also changed, the first formula and the second formula are used as the basis for selecting the material and the size of the corrugated pipe (4), and the formulas are as follows: equation one,
Formula II,Then->In the first formula and the second formula
-the pressure of water and soil cement against the bottom section of the bellows (4), -the ∈10>；
The effective length of the corrugated pipe (4) embedded in the cement-soil mixing pile (2), namely the water injection height of the corrugated pipe (4), and the water injection height of the corrugated pipe (4)>；
-volume weight of water, jersey>；
-volume weight of cement soil, < - > j->；
The lateral pressure coefficient before the initial setting of the cement soil is dimensionless, and is determined by a test, and 0.4 to 0.6 is taken when no test data exists;
-the hoop tension exerted by the circular section of the bellows (4), -the +.>；
-calculated radius of bellows (4), -j->；
-the angle between any point on the circumference of the circular section of the bottom surface of the bellows (4) and the horizontal axis, +.>；
-the hoop tensile stress to which the bottom circular section of the bellows (4) is subjected, +.>Wherein 1 is the unit height, < >>；
-calculating the wall thickness of the bellows (4) circular section, ->；
-the bellows (4) circular section material tolerates tensile stress, < >>；
-calculating the circumference of the bottom section of the bellows (4), -and>；
-calculated perimeter elongation of the bottom section of the bellows (4) under the pressure of water and cement soil, < ->；
-calculated radius of bellows (4), -j->；
-the bottom section of the bellows (4) calculates the radius increment, < > -under the pressure of water and soil cement>，
The increase in (2) may press against the inner wall of the drill rod (55) by selecting the appropriate waveThe clearance between the external diameter of the bellows (4) and the drill rod (55) and the wall thickness and elastic modulus parameters of the bellows (4) do not cause increment of calculated radius of the bellows>The increase of the diameter of the corrugated pipe (4) is 2 mm-4 mm, which is used for clamping the drill rod (55) to influence the retention of the corrugated pipe;
the bottom section of the corrugated pipe (4) extends to a unit circumference in a circumferential direction under the pressure action of water and cement soil, and the expansion is dimensionless, namely strain;
-modulus of elasticity of bellows (4), - ∈>；
-bellows (4) calculate the design allowance of the radius increment, < >>。
3. The construction device of the cast-in-situ concrete core cement mixing pile according to claim 1, wherein the fastening component comprises a pull rod (58) arranged in the corrugated pipe (4), the lower end of the pull rod is detachably connected to the drill bit (57), and a pull rod ring (581) is arranged at the upper end of the pull rod (58); the upper end of the corrugated pipe (4) is provided with a pull rod bolt (583), the pull rod bolt horizontally penetrates through the pull rod ring (581) and enables the pull rod (58), the corrugated pipe (4) and the drill bit (57) to form a whole, and two ends of the pull rod bolt (583) respectively penetrate through and are arranged in a chute (61) which is formed by vertically extending the side wall of the lower drill rod (552); the lower drill rod (552) is externally provided with a hoop (6) which is detachably and tightly attached to the lower part of the pull rod bolt (583), the hoop is tightly held outside the lower drill rod (552), and the lifting and moving positions of the two ends of the pull rod bolt (583) in the sliding groove (61) are positioned.
4. The construction device of the cast-in-situ concrete core cement mixing pile according to claim 3, wherein a flange connected with each other is arranged between the bottom end of the upper drill rod and the top end of the lower drill rod, two sliding grooves (61) are arranged below a flange (553) at the top end of the lower drill rod (552), the sliding grooves are symmetrically arranged on the side wall of the lower drill rod (552) by taking the axis of the lower drill rod (552) as the center, the vertical extension length of each sliding groove (61) is 1-2 m, the width of each sliding groove is 1-2 m larger than the diameter of a pull rod bolt (583), and the two ends of the pull rod bolt (583) move up and down along the sliding grooves (61) and drive a corrugated pipe (4) and a drill bit (57) to move up and down synchronously in the lower drill rod (552).
5. A construction device of a cast-in-situ concrete core cement mixing pile according to claim 3, wherein the pull rod (58) is a steel round rod and is arranged at the axle center of the lower drill rod (552) and the corrugated pipe (4), the lower end of the pull rod (58) is provided with a pull rod bolt (582) detachably connected to the drill bit (57), and the pull rod ring (581) is an integrally formed round ring at the upper end of the pull rod (58).
6. The construction apparatus for a cast-in-situ concrete core cemented soil mixing pile according to claim 3, wherein the pull rod bolt (583) is a steel round rod, one end of the pull rod bolt (583) is in a nut shape, the other end of the pull rod bolt is provided with a bolt hole, and the pull rod bolt (583) is temporarily fixed by inserting a bolt (584) into the bolt hole after sequentially passing through the chute (61) on one side of the lower drill rod (552), the pull rod ring (581) and the chute (61) on the other side of the lower drill rod (552).
7. The construction device of the cast-in-situ concrete core cement mixing pile according to claim 3, wherein the anchor ear (6) is formed by connecting left and right semicircular plates in a butt joint way, wing plates are arranged on the left and right semicircular plates, and fastening bolts for holding the anchor ear (6) are arranged on the wing plates.
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Address after: 325002 No. 29, No. three industrial zone, Pu Zhou, Lucheng District, Wenzhou, Zhejiang. Applicant after: Zhejiang Green Art Construction Co.,Ltd. Address before: 325002 No. 29, No. three industrial zone, Pu Zhou, Lucheng District, Wenzhou, Zhejiang. Applicant before: ZHEJIANG GREEN ART GARDEN & PARK ENGINEERING Co.,Ltd. |
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Denomination of invention: Construction equipment for cast-in-place concrete core cement soil mixing piles Granted publication date: 20231219 Pledgee: Zhejiang Wenzhou Lucheng Rural Commercial Bank Co.,Ltd. Shuangyu sub branch Pledgor: Zhejiang Green Art Construction Co.,Ltd. Registration number: Y2024330001011 |
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