CN101215836B - Construction machinery used for large diameter hollow pile and its construction method and use - Google Patents

Construction machinery used for large diameter hollow pile and its construction method and use Download PDF

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Publication number
CN101215836B
CN101215836B CN2007100605589A CN200710060558A CN101215836B CN 101215836 B CN101215836 B CN 101215836B CN 2007100605589 A CN2007100605589 A CN 2007100605589A CN 200710060558 A CN200710060558 A CN 200710060558A CN 101215836 B CN101215836 B CN 101215836B
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pile
drill bit
injection stream
hollow pile
piling
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CN2007100605589A
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Chinese (zh)
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CN101215836A (en
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雷玉华
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雷玉华
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Abstract

The invention discloses a construction machine for hollow piles with large diameter and the construction method and usage, which comprises a drilling system, a pile pounding system, a drainage system which are integrated into one part. The pile forming method comprises: a high-spray drilling bit is arranged on a steel tube (a protection cylinder) or on the bottom of an inner hole of a pre-made tube pile for hole drilling and mud making; the mud is drained from a water joint or a drainage pipe; the protection cylinder or tube pile is pressed asynchronously or synchronously along with the drilling bit; during pile-sinking process, water mud is sprayed to the outer soil of the hole to solidify the surrounding soil of the pile and fill the gaps between the pile and surrounding soil of the pile; after the drilling bit reaches certain depth, the water mud is again sprayed to solidify surrounding soil of the pile; lifting the drilling bit; putting down reinforcement cage; casting concrete for piling. The invention is a construction method for foundation piles and drilling with large diameter, super long and high load, which especially provides convenient, labor-saving, rapid and economical equipment and method for marine pile driving.

Description

The construction machinery and job practices and the purposes that are used for large diameter hollow pile

Technical field

The present invention relates to a kind of construction machine and job practices thereof, especially heavy caliber foundation pile or push pipe pass through the construction machinery that is used for large diameter hollow pile and the job practices and the purposes of engineering.

Background technology

The type of the big load foundation pile of existing heavy caliber mainly contains bored pile, preformed pile etc.; The hole forming method of bored pile has positive reverse circulation drilling, rotary digging drilling hole and auger boring, gyro to be drilled to hole forming methods such as hole.It is slow that said method has speed of fulfiling hole respectively, the deficiency of retaining wall (especially liquefied sand) difficulty, and stake footpath, the stake of squeezing into preformed pile are long all very limited, and meet silt, the equal pile sinking difficulty of flour sand or stratum such as cobble, decomposed rock, cause the loading force of stake very restricted thereby easily the stake point is exploded or pile body swarmed in.This is the common problem that present domestic and international market runs in the construction of high-bearing capacity stake type, needs solution badly.

Summary of the invention

Technical problem to be solved by this invention is, a kind of construction machinery and job practices and purposes that is used for large diameter hollow pile is provided, and satisfies that major diameter, timber pile are long, the construction of high load foundation pile.

In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of construction machinery that is used for large diameter hollow pile, comprise hole-drilling system, row injection system, piling system, described hole-drilling system comprises the drill bit, drill bit power set, the drill bit stride drilling apparatus that have high injection stream water filling device, is positioned at drill bit top and the integrally formed cylindric retaining wall circle of drill bit; Described piling system comprises hanging apparatus, stake machine mobile device, piling device; Described row's injection system comprises high injection stream water filling device, annotates concrete device and discharge pipe; In the inner chamber that creeps into end of hollow pile, be fixed with fixed case, the upper end of fixed case links to each other with hanging apparatus, the lower chassis of fixed case removably is fixed on the flange that creeps into end of hollow pile, the fixed case internal fixation has drill bit stride drilling apparatus, the drill bit power set are positioned at the outside of the lower chassis of fixed case, be connected on the drill bit stride drilling apparatus, drill bit is connected on the drill bit power set by water swivel; The notes concrete pipe that is connected with notes concrete device passes fixed case and is fixed on the lower chassis, discharge pipe passes fixed case and is fixed on the lower chassis, the high jet pipe that is connected with high injection stream water filling device passes fixed case and is fixed on the water swivel entrance point, be connected with high spraying nozzle at the water swivel port of export, high spraying nozzle is positioned at the middle part of bit drills tooth.

Described row's injection system also comprises high injection stream grouting device, the high injection stream Grouting Pipe that is connected with high injection stream grouting device is passed fixed case and is fixed on the water swivel entrance point, be connected with high injection stream slip casting nozzle at the water swivel port of export, high injection stream slip casting nozzle is arranged on the top of drill bit retaining wall circle.

Described drill bit is one or more.

Described hollow pile is a kind of in casing, steel pipe pile or the prefabricated tubular pile.

A kind of job practices that is used for the construction machinery of large diameter hollow pile may further comprise the steps:

A, startup are contained in the drill bit that hollow pile creeps into end, start high injection stream water filling device, cutting soil, and the boring pulping makes mud discharge by the plasma discharge system;

B, when soil layer is not too hard, creep in the time of keeping synchronous with piling, synchronously hollow pile is pressed into;

C, when running into hard formation or decomposed rock, start the stride drilling apparatus, boring certain depth earlier, the piling certain depth circulates like this and creeps into piling, promptly asynchronous piling again;

After d, boring reached projected depth, high injection stream water filling device stopped water filling, holds native mesohigh spray cement paste with high injection stream water filling device to stake, and stake end soil is reinforced, and controlled pressure enlarges the churning diameter to form enlarged footing;

E, carry and bore to annotate concrete, pile.

The present invention is used for the job practices of the construction machinery of large diameter hollow pile, also can be may further comprise the steps:

A, startup are contained in the drill bit that hollow pile creeps into end, start high injection stream water filling device, cutting soil, the boring pulping, mud is discharged by the plasma discharge system, start high injection stream grouting device simultaneously, spray cement paste in pile peripheral earth makes all soil of stake become cement earth pile and forms compound pile with hollow pile;

B, when soil layer is not too hard, creep in the time of keeping synchronous with piling, synchronously hollow pile is pressed into;

C, when running into hard formation or decomposed rock, start the stride drilling apparatus, boring certain depth earlier, the piling certain depth circulates like this and creeps into piling, promptly asynchronous piling again;

After d, boring reached projected depth, high injection stream water filling device stopped water filling, holds native mesohigh spray cement paste with high injection stream water filling device to stake, and stake end soil is reinforced, and controlled pressure enlarges the churning diameter to form enlarged footing;

E, carry and bore to annotate concrete, pile.

Described step e is: be a mouth at the bottom of sealing, annotate concrete simultaneously carrying when boring, to certain depth, stop to annotate concrete, propose drilling tool and power set, put into reinforcing cage, annotate concrete, pile once more.

Described step e is: brill is carried on marginal not concrete limit, until reaching absolute altitude, proposes drilling tool.

Also comprise, insert reinforcing cage behind the pile again.

The construction machinery that is used for large diameter hollow pile passes through application in engineering at the foundation pile and the push pipe of heavy caliber, overlength, big load.

The invention has the beneficial effects as follows:

1, equipment of the present invention and worker's method integrate drilling and forming hole and piling (or jacking), make the soil compaction pile of preformed pile become the boring pile sinking, and this reduces the side friction of pile driving process king-pile greatly, and end resistance almost becomes zero.Because the reduction greatly of penetrating resistance, during construction pile body can be not again because of passing the pan soil interlayer, or for to enter the bearing stratum flour sand layer or the decomposed rock of design, and pile crown is exploded, press from both sides pile body quick-fried or when the folder stake because of the too big destruction of causing pile strength of armful folder power; It is bigger that the diameter of pile for prestressed pipe, steel pipe pile just can design, and the hardpan that passes just no longer becomes problem.

2, present device is furnished with high injection stream grouting device, when pile sinking (or push pipe), can constantly reinforce pile peripheral earth to stake Zhou Tuzhong gunite.Pile peripheral earth becomes cement-soil, and the diameter of reinforcing scope is greater than pile tube diameter (20%~30%), and pile tube forms compound pile with all cement-soil engagements of stake, and its total side friction can make the vertical bearing capacity of single pile of stake improve 1.5~1.8 times; High injection stream water filling device is held native mesohigh gunite to make by the soil body of drill bit disturbance to stake and is replaced as cement-soil before pile sinking reaches projected depth, and drill bit is extracted; Further pressurization (more than the 30MPa) can be held the enlarged footing that forms a cement-soil in the soil in stake, and this method has not only overcome at the bottom of the conventional borehole stake hole sediment and has been difficult to remove and causes holding the often minimum deadly defect of load, and has improved the end load of stake greatly.

3, the 3rd of high injection stream water filling device the advantage is, at super large caliber (during the construction of the stake of 1.5m~5.0m) creeps into, utilize the high-pressure rotary-spray jet can be with intact soil body cutting damage pulping in the blind area between a plurality of drill bits, avoided the blind area undisturbed soil when being subjected to upper tube sunk pile pressure pressurized and will around or adjacent drill bit squeeze off normal or squeeze bad.

4, on the equipment of the present invention hydraulic feed device is housed, the benefit of this device is to run into the pan soil interlayer, when hard soil layer (mark passes through and hits several N>40) or decomposed rock, can make pile sinking and creep into that walking is asynchronous to carry out, promptly pile sinking (or push pipe) stops, and promotes drill bit by hydraulic pusher and creeps into the pulping pore-forming and reach certain depth (such as 1m), stop to creep into piling then until reaching projected depth, move in circles like this and creep into, pile sinking continues, and the propeller descending drill bit that reduces pressure shrinks relatively.

5, first benefit of machinery of the present invention is large-caliber pile construction or heavy caliber pipe when passing through, and uses drill bit to creep into, and this method reduces drill bit level torsion by stages, creeps into easilier thereby make, and drilling speed can be faster.It is littler, lighter and handier that the power set of drill bit also can become.

Description of drawings

Fig. 1 is the composition schematic diagram of the present invention's construction machinery of being used for large diameter hollow pile.

Fig. 2 is the structure chart that the present invention has a bit system and row's injection system.

Fig. 3 is the structural representation that the present invention has two bit systems and row's injection system.

Fig. 4 is the one-tenth pile work method schematic diagram of the present invention's construction machinery of being used for large diameter hollow pile.

Among the figure, 1, pile press; 2, chassis; 3, mobile device; 4, power set; 5, hollow pile; 6, high injection stream water filling device; 7, annotate the concrete device; 8 have the drill bit of high injection stream water filling device; 9, drill bit; 10, high jet pipe; 11, drill bit dynamical system; 12, hydraulic pusher; 13, hydro-power pump; 14, hydraulic power transmitting device; 15, discharge pipe; 16, annotate the concrete pipe; 17, hanging apparatus.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of equipment of the present invention and worker's method being done one describes in detail:

As shown in Figure 1, 2, the present invention is used for the construction machinery of large diameter hollow pile, comprise hole-drilling system, row injection system, piling system, described hole-drilling system comprises the drill bit 9, drill bit power set 11, the drill bit stride drilling apparatus 30 that have high injection stream water filling device, is positioned at drill bit top and the integrally formed cylindric retaining wall circle 27 of drill bit; Described piling system comprises hanging apparatus 17, stake machine mobile device 3, piling device; Described row's injection system comprises high injection stream water filling device 6, annotates concrete device 25 and discharge pipe 15; In the inner chamber that creeps into end of hollow pile 5, be fixed with fixed case 20, the upper end of fixed case 20 links to each other with hanging apparatus 17, the lower chassis 23 of fixed case 20 removably is fixed on the flange that creeps into end of hollow pile 5, fixed case 20 internal fixation have drill bit stride drilling apparatus 30, drill bit power set 11 are positioned at the outside of the lower chassis 23 of fixed case 20, be connected on the drill bit stride drilling apparatus 30, drill bit 9 is connected on the drill bit power set 11 by water swivel 21; The notes concrete pipe 16 that is connected with notes concrete device 7 passes fixed case 20 and is fixed on the lower chassis 23, discharge pipe 15 passes fixed case 20 and is fixed on the lower chassis 23, the high jet pipe 10 that is connected with high injection stream water filling device 6 passes fixed case 20 and is fixed on water swivel 21 entrance points, be connected with high spraying nozzle 24 at water swivel 21 ports of export, high spraying nozzle 24 is positioned at the middle part that drill bit 9 bores tooth.

Described row's injection system can also comprise high injection stream grouting device 25, the high injection stream Grouting Pipe 22 that is connected with high injection stream grouting device 25 is passed fixed case 20 and is fixed on water swivel 21 entrance points, be connected with high injection stream slip casting nozzle 26 at water swivel 21 ports of export, high injection stream slip casting nozzle 26 is arranged on the top of drill bit retaining wall circle 27.

Described drill bit is one or more.As shown in Figure 3, for having the structure of two bit systems and row's injection system.

Described hollow pile is a kind of in casing, steel pipe pile or the prefabricated tubular pile.

The present invention is used for the job practices of the construction machinery of large diameter hollow pile, may further comprise the steps:

A, startup are contained in the drill bit that hollow pile creeps into end, start high injection stream water filling device, cutting soil, and the boring pulping makes mud discharge by the plasma discharge system;

B, when soil layer is not too hard, creep in the time of keeping synchronous with piling, synchronously hollow pile is pressed into;

C, when running into hard formation or decomposed rock, start the stride drilling apparatus, boring certain depth earlier, the piling certain depth circulates like this and creeps into piling, promptly asynchronous piling again;

After d, boring reached projected depth, high injection stream water filling device stopped water filling, holds native mesohigh spray cement paste with high injection stream water filling device to stake, and stake end soil is reinforced, and controlled pressure enlarges the churning diameter to form enlarged footing;

E, carry and bore to annotate concrete, pile.

The present invention is used for the job practices of the construction machinery of large diameter hollow pile, also can be may further comprise the steps:

A, startup are contained in the drill bit that hollow pile creeps into end, start high injection stream water filling device, cutting soil, the boring pulping, mud is discharged by the plasma discharge system, start high injection stream grouting device simultaneously, spray cement paste in pile peripheral earth makes all soil of stake become cement earth pile and forms compound pile with hollow pile;

B, when soil layer is not too hard, creep in the time of keeping synchronous with piling, synchronously hollow pile is pressed into;

C, when running into hard formation or decomposed rock, start the stride drilling apparatus, boring certain depth earlier, the piling certain depth circulates like this and creeps into piling, promptly asynchronous piling again;

After d, boring reached projected depth, high injection stream water filling device stopped water filling, holds native mesohigh spray cement paste with high injection stream water filling device to stake, and stake end soil is reinforced, and controlled pressure enlarges the churning diameter to form enlarged footing;

E, carry and bore to annotate concrete, pile.

Described step e is: be a mouth at the bottom of sealing, annotate concrete simultaneously carrying when boring, to certain depth, stop to annotate concrete, propose drilling tool and power set, put into reinforcing cage, annotate concrete, pile once more.

Described step e is: brill is carried on marginal not concrete limit, until reaching absolute altitude, proposes drilling tool.Can also select to insert reinforcing cage again behind the pile.

The construction machinery that the present invention is used for large diameter hollow pile passes through application in engineering at the foundation pile and the push pipe of heavy caliber, overlength, big load.

Drill bit stride drilling apparatus 30 comprises hydraulic pusher 12, hydro-power pump 13 that links to each other with hydraulic pusher 12 and hydraulic power transmitting device 14.

The lower chassis 23 of fixed case 20 is connected bayonet socket 19 by the jig 18 that tightens up or unload from steel pipe or pile tube and is fixed on steel pipe or the pile for prestressed pipe flange inner wall with pile tube.

Below in conjunction with accompanying drawing, forming compound piles with two drill bits is example, and the construction of foregoing invention machinery is elaborated:

Shown in Fig. 4 (a), pile-forming machine perching, the align piles position, with steel pipe (stake) or cement pile for prestressed pipe, and all penetrate drill bit 9, dynamical system 11 etc. in the pore and fix, start drill bit with high injection stream water filling device 6 and begin water spray and creep into, and start high injection stream grouting device 25 simultaneously, spray cement paste in pile peripheral earth.

Shown in Fig. 4 (b), along with creeping into,, start piling mechanism 1 simultaneously in mud pipe 15 holes because the pressure of water is discharged to mud the mud sump of ground, synchronously steel pipe (stake) or pile tube are compressed into (or jacking); Note observing the force value of pile press upward pressure table, too high as force value, then stop synchronous piling.

Shown in Fig. 4 (c), first segment steel pipe (stake) or pile tube are pressed onto after the position, start hanging apparatus 17, the second pipe joint stake of slinging, with whole dynamic transfer systems, discharge pipe 15, high injection stream water filling device 10, high injection stream grouting device 25 etc. pass and connect from the second pipe joint stake.With the second pipe joint stake and first segment pile tube contraposition welding, continue step shown in the earlier figures 4 (b).

Shown in Fig. 4 (d), Fig. 4 (e), when (creeping into) pile sinking, when running into hard interbedded layer or entering bearing stratum, force value shows too high, at this moment, stops piling immediately, changing synchronous piling is asynchronous piling, promptly start hydraulic pusher 12 and promote drill bits and creep into, when creep into finish one stroke after, push rod is shunk in propeller 12 decompressions, begin piling (Fig. 4 (e)) simultaneously, when treating that piling reaches drilling depth, stop piling again, open propeller and creep into the spoil disposal pore-forming once more, move in circles.Asynchronous piling can be avoided drill bit is damaged by pressure.The control of force value should be determined with reference to geologic report and piling practical experience.

Shown in Fig. 4 (f), the boring piling is to the absolute altitude of designing requirement.

Shown in Fig. 4 (g), after piling puts in place, stop piling and water spray, high spray water is converted to soil body mesohigh churning cement paste to the disturbance of stake bottom, and is forced into that 30MPa is above to be sprayed, make the stake end form a cement-soil major part that enlarges, and make cement paste under high drive, upwards pierce, in the crack of pile tube outer wall and inter-pile soil, the slit squeeze note is closely knit with water under high pressure mud.Reach with this and both to improve the end load, improve the effect of side friction again, surpassed the soil compaction stake and change the side friction and end load that drilled pile loses into even remedy.

Shown in Fig. 4 (h), after finishing last high spray cement paste, drill bit 9, jig 18 are connected bayonet socket 19 to be disconnected with pile tube, carry whole apparatuses in drill bit 9 pores such as grade on the pressure injection concrete limit, concrete pipe 16 limit by annotating, when mentioning the reinforcing cage bottom when following, can stop to annotate concrete, whole operation drilling tools and each system are proposed outside the pile tube.

Shown in Fig. 4 (i), in pile tube, insert reinforcing cage.(as design no-reinforcing-bar cage, then Fig. 4 (h) but shown in step marginal not concrete limit carry drilling tool and stop up to the stake top.)

Shown in Fig. 4 (j), perfusion concrete, pile.

If do not start high injection stream grouting device 25 spray cement paste in pile peripheral earth, so just only form single pile.Described hollow pile is a kind of in casing, steel pipe pile or the prefabricated tubular pile.If use casing, casing need be extracted.

For the purpose of explanation, the detailed icon and the explanation of pile sinking have only been listed, as long as the construction sequence that the large diameter pipeline limit is passed through cuts the step of irritating cage and pile bottom reinforcing under the concrete.

The present invention satisfies the construction of high load (more than the 4000KN-6000KN) foundation pile more than major diameter (generally more than the 1m) timber pile long (generally at 50m) and the requirement of equipment, make the bored pile piling of high load, major diameter, timber pile length more guaranteed, speed is faster, thoroughly solves the middle borehole wall-protection of abominable soil layer (as quicksand) and does not become, wears the not difficult problem of saturating hard soil layer.Have the advantage, the especially marine guidance piling that reduce cost, alleviate equipment self-weight, solve a series of problems such as construction difficult problem convenient, laborsaving, quick, economic worker's method is provided.

In sum, thinking of the present invention is:

1, adds one or several high spray drill bits in the lower end of steel pipe or pile tube etc., form mud by the rotation destruction soil body of drill bit and by pile tube or steel casing (pile tube) mesopore; When many drill bits, start high-pressure injection water filling device jetting undisturbed soil body and function jet water column cutting damage between each system's drill bit is formed mud; If be provided with high injection stream grouting device, start high injection stream grouting device simultaneously, spray cement paste in pile peripheral earth makes all soil of stake become cement earth pile and forms compound pile with hollow pile;

2, mud is discharged from the plasma discharge passage, to reach the purpose in hole clearly;

3, along with the progressively intensification in hole, steel pipe (casing) or pile for prestressed pipe are pressed into; Can satisfy the speed of piling or jacking as rate of penetration in weak soil, can be pressed into synchronously,, then utilize the walking propeller to creep into certain depth earlier, and then piling or push pipe promptly adopt asynchronous being pressed into or jacking to this degree of depth as pan soil or decomposed rock etc.

4, treat that steel pipe (casing) or pile for prestressed pipe are pressed onto projected depth after, stop boring and high-pressure spray and inject cement paste, stake end disturbed soil is reinforced and cement paste is pressed in the crack between pile lining and the inter-pile soil to guarantee side friction;

5, drill bit and churning device power set etc. is proposed from casing or pile for prestressed pipe;

6, reinforcing cage is put into steel pipe or pile for prestressed pipe;

7, penetration concrete, pile is finished.

Among the embodiment that content of the present invention is not confined to, the knowledgeable people in the same area can propose other embodiment easily within technological guidance's thought of the present invention, but this embodiment comprises within the scope of the present invention.

Claims (10)

1. construction machinery that is used for large diameter hollow pile, it is characterized in that, comprise hole-drilling system, row injection system, piling system, described hole-drilling system comprises the drill bit (9), drill bit power set (11), the drill bit stride drilling apparatus (30) that have high injection stream water filling device, is positioned at drill bit top and the integrally formed cylindric retaining wall circle (27) of drill bit; Described piling system comprises hanging apparatus (17), stake machine mobile device (3), piling device; Described row's injection system comprises high injection stream water filling device (6), annotates concrete device (7) and discharge pipe (15); In the inner chamber that creeps into end of hollow pile (5), be fixed with fixed case (20), the upper end of fixed case (20) links to each other with hanging apparatus (17), the lower chassis (23) of fixed case (20) removably is fixed on the flange that creeps into end of hollow pile (5), fixed case (20) internal fixation has drill bit stride drilling apparatus (30), drill bit power set (11) are positioned at the outside of the lower chassis (23) of fixed case (20), be connected on the drill bit stride drilling apparatus (30), drill bit (9) is connected on the drill bit power set (11) by water swivel (21); The notes concrete pipe (16) that is connected with notes concrete devices (7) passes fixed case (20) and is fixed on the lower chassis (23), discharge pipe (15) passes fixed case (20) and is fixed on the lower chassis (23), the high jet pipe (10) that is connected with high injection stream water filling device (6) passes fixed case (20) and is fixed on water swivel (21) entrance point, be connected with high spraying nozzle (24) at water swivel (21) port of export, high spraying nozzle (24) is positioned at the middle part that drill bit (9) bores tooth.
2. the construction machinery that is used for large diameter hollow pile according to claim 1, it is characterized in that, described row's injection system also comprises high injection stream grouting device (25), the high injection stream Grouting Pipe (22) that is connected with high injection stream grouting device (25) is passed fixed case (20) and is fixed on water swivel (21) entrance point, be connected with high injection stream slip casting nozzle (26) at water swivel (21) port of export, high injection stream slip casting nozzle (26) is arranged on the top of drill bit retaining wall circle (27).
3. the construction machinery that is used for large diameter hollow pile according to claim 1 and 2 is characterized in that, described drill bit is one or more.
4. the construction machinery that is used for large diameter hollow pile according to claim 1 and 2 is characterized in that, described hollow pile is a kind of in casing, steel pipe pile or the prefabricated tubular pile.
5. described job practices that is used for the construction machinery of large diameter hollow pile of claim 1 may further comprise the steps:
A, startup are contained in the drill bit that hollow pile creeps into end, start high injection stream water filling device, cutting soil, and the boring pulping makes mud discharge by the plasma discharge system;
B, when soil layer is not too hard, creep in the time of keeping synchronous with piling, synchronously hollow pile is pressed into;
C, when running into hard formation or decomposed rock, start the stride drilling apparatus, boring certain depth earlier, the piling certain depth circulates like this and creeps into piling, promptly asynchronous piling again;
After d, boring reached projected depth, high injection stream water filling device stopped water filling, holds native mesohigh spray cement paste with high injection stream water filling device to stake, and stake end soil is reinforced, and controlled pressure enlarges the churning diameter to form enlarged footing;
E, carry and bore to annotate concrete, pile.
6. described job practices that is used for the construction machinery of large diameter hollow pile of claim 2 may further comprise the steps:
A, startup are contained in the drill bit that hollow pile creeps into end, start high injection stream water filling device, cutting soil, the boring pulping, mud is discharged by the plasma discharge system, start high injection stream grouting device simultaneously, spray cement paste in pile peripheral earth makes all soil of stake become cement earth pile and forms compound pile with hollow pile;
B, when soil layer is not too hard, creep in the time of keeping synchronous with piling, synchronously hollow pile is pressed into;
C, when running into hard formation or decomposed rock, start the stride drilling apparatus, boring certain depth earlier, the piling certain depth circulates like this and creeps into piling, promptly asynchronous piling again;
After d, boring reached projected depth, high injection stream water filling device stopped water filling, holds native mesohigh spray cement paste with high injection stream water filling device to stake, and stake end soil is reinforced, and controlled pressure enlarges the churning diameter to form enlarged footing;
E, carry and bore to annotate concrete, pile.
7. according to claim 5 or the 6 described job practicess that are used for the construction machinery of large diameter hollow pile, it is characterized in that, described step e is: be a mouth at the bottom of sealing, when carrying brill, annotate concrete simultaneously,, stop to annotate concrete to certain depth, drilling tool and power set are proposed, put into reinforcing cage, annotate concrete, pile once more.
8. according to claim 5 or the 6 described job practicess that are used for the construction machinery of large diameter hollow pile, it is characterized in that described step e is: brill is carried on marginal not concrete limit, until reaching absolute altitude, proposes drilling tool.
9. the job practices that is used for the construction machinery of large diameter hollow pile according to claim 8 is characterized in that, also comprises, inserts reinforcing cage behind the pile again.
10. claim 1 or the 2 described construction machineries that are used for large diameter hollow pile pass through application in engineering at the foundation pile and the push pipe of heavy caliber, overlength, big load.
CN2007100605589A 2007-12-29 2007-12-29 Construction machinery used for large diameter hollow pile and its construction method and use CN101215836B (en)

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