CN1177109C - Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pile - Google Patents
Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pileInfo
- Publication number
- CN1177109C CN1177109C CNB021038554A CN02103855A CN1177109C CN 1177109 C CN1177109 C CN 1177109C CN B021038554 A CNB021038554 A CN B021038554A CN 02103855 A CN02103855 A CN 02103855A CN 1177109 C CN1177109 C CN 1177109C
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Abstract
The present invention relates to a pile end mortar pre-pressing construction method for a long screw auger drilling deposited pile and a CFG pile, which comprises the following steps: drilling a screw pile pipe of a long screw pile machine in rotation for discharging soil in a drill hole to designed depth; after holes are drilled, the screw pile pipe is not extracted; starting a slurry pump for pressure casting; delivering cement slurry to a casting port of a drill head via a high-pressure mortar delivering pipe, a rotary casting joint and a mortar and water delivering pipe; pre-pressing mortar for a pile end; consolidating soil at a pile bottom and soil body around the pile end; starting a concrete pump; pumping concrete to a feed outlet of the drill head via a delivering pipe and the screw pile pipe for pressure perfusion; synchronously extracting the screw pile pipe and forming a pile. After the pile is formed, a reinforcing cage is placed according to a design requirement. A construction device is provided with the rotary casing joint on the upper part of the screw pile pipe; at least one mortar delivering pipe is attached at the inner wall or an outer wall of the screw pile pipe; an outlet is positioned at the casting port of a drill head. Pressure casting or water injection can be realized, and water is sprayed for drilling. The present invention can substantially raise the bearing capacity of a single pile, reduce the settlement of the pile, enhance construction quality and efficiency, and prevent a rod surrounding phenomenon. The present invention can be applied to the construction of long screw auger drilling deposited piles and CFG piles under various geological conditions.
Description
Technical field
The present invention relates to the job practices and the device of in situ pile, CFG stake on a kind of architecture foundation pile preprocess method and device, particularly long auger, the reinforced concrete.
Background technology
The job practices of long auger in situ pile, CFG stake, two kinds of " pile " job practicess after being divided into traditional " secondary pile " job practices and improving.Traditional " secondary pile " job practices is after long-spiral drilling machine is drilled to a hole, rises to pull out drilling rod and stay emptying aperture, lays placement of cage of reinforcing bar (or not having reinforcing cage), again the concrete perfusion pile that vibrates simultaneously in emptying aperture." secondary pile " method construction before concrete perfusion, the not necking down that must guarantee to hole, is not caved in, thus below groundwater table or soil layer all can't construct when loose, its scope of application is very limited." pile " method is improved long spiral press power castinplace pile (being called for short " press and irritate stake " or " center pressure pipe stake ") job practices.Be that the long-spiral drilling machine drilling and forming hole stops boring to projected depth, use the concrete pump delivering concrete, unit head by hollow, screw pile pipe are to the discharging opening at drill bit place, the initiation pressure concrete perfusion, and synchronization onwards is pulled out screw pile pipe pile, after the screw pile pipe was extracted, concrete poured into simultaneously and finishes; Before concrete does not have initial set, whether place reinforcing cage behind the pile according to designing requirement.Because in " pile " method work progress, whenever all not vacant hole, so there is not the borehole collapse problem of " secondary pile " method, therefore " pile " method can be applicable to long screw auger drilling deposited pile, the CFG pile driving construction of various geological conditionss.
Patent of invention ZL 94116598.1 " job practices of the pile tip grouting of in situ pile and pile-end pressure grouting madjack pipe " is for bored pile, particularly the foundation pile post processing of the long stake of mud off method pore-forming.Promptly filling pile construction finishes at the scene, after the concrete initial set, again foundation pile is carried out post processing.Its key step is: behind drilling pouring pile hole, and when transferring reinforcing cage before the concrete perfusion, the fixing pile-end pressure grouting madjack pipe in the both sides of reinforcing cage, clear hole, concrete perfusion carried out mud jacking in 3～7 days behind the pile.
Existing long screw auger drilling deposited pile, CFG stake, because there is following problem in the limitation of construction technology:
1. in drilling process, bit part exists some loosened soil to be gone out by the screw pile pipe racks all the time, so stake end always has certain loosened soil to exist behind the pile, makes the stake end can't closely knitly contact with the bearing stratum soil body, causes that end resistance reduces, the sedimentation increase of stake.
2. for pile foundation, no matter be end bearing pile or Piles for Friction Piles, the intensity of its bearing course at pile end soil always is higher than the intensity of shallow layer foundation soil, if increase the floor space of stake end, utilize the higher bearing stratum soil body of intensity more, then bearing capacity of single pile can further improve.
3. in the long-spiral drilling machine drilling and forming hole process, the roach that gets out rises along the helical blade rotation on the screw pile pipe and discharges.When in the higher soil layer of viscosity, creeping into, often influence pore-forming, can form the earth pillar of piston-like when serious, claim " pole " phenomenon in the construction, can not creep into fully because of roach is bonded in can not discharge smoothly on the helical blade.Need in the construction to rise repeatedly and pull out the screw pile pipe, lean on manpower to clear up the roach that is bonded on the blade, water filling in boring simultaneously is so that clay softening and its adhesion stress of reduction." pole " phenomenon is very big to construction quality, the efficiency of construction influence of long screw pile machine.
Technology contents
The present invention handles by the stake end mortar pre-pressing, solve because there is loosened soil in the stake end, the stake end can't closely knitly be contacted with the bearing stratum soil body, cause bearing capacity of single pile low, can't lay out pile, big and clay " pole " technical problem of the overall settling amount of building, bearing capacity, construction quality and the efficiency of construction of raising foundation pile.
Technical scheme: the step of the stake end mortar pre-pressing construction method of long screw auger drilling deposited pile of the present invention, CFG stake is:
The screw pile pipe rotary drilling of a, long screw pile machine is discharged the soil in the boring, to projected depth;
Behind b, the pore-forming, the screw pile pipe is not extracted, and starts mortar pump and carries out slip casing by pressure, and cement paste to the drill bit grouting port, carries out pre-mud jacking to the stake end in high pressure feed pipe for mortar, rotation filling adaptor, defeated slurry water-supply-pipe, the reinforcing stake end loosened soil and the stake end soil body on every side;
C, start concrete pump, pumping of concrete to the drill bit discharging opening, carries out pressure injection through carrier pipe, screw pile pipe, and tube drawing, pile synchronously.
Behind the above-mentioned pile, place reinforcing cage, finish bored pile.
Behind the above-mentioned pile or in the formation of pile, start water pump, water spray creeps into, and water flows out along defeated slurry water-supply-pipe to drill bit, residual cement paste or " pole " clay in the annular feeding chamber in the cleaning rotation filling adaptor.
Behind the above-mentioned pile or in the formation of pile, start water pump, water spray creeps into, and water flows out along defeated slurry water-supply-pipe to drill bit, residual cement paste or " pole " clay in the annular feeding chamber in the cleaning rotation filling adaptor.
In the above-mentioned slip casting process, the screw pile pipe can rotate or not change.
Long screw auger drilling deposited pile of the present invention, the stake end mortar pre-pressing device of CFG stake, the screw pile pipe is arranged on mainframe, dynamic head on the screw pile pipe, under drill bit is arranged, screw pile pipe tube core connects elephant trunk and concrete pump, it is characterized in that: between screw pile pipe top and unit head, fixedly connected a rotation filling adaptor, the rotation filling adaptor is by combining through swivel bearing with the interior cover of screw pile pipe rotation and fixing overcoat, form an annular feeding chamber between overcoat and the interior cover middle part, the sleeve side wall in this chamber is connected with water pipe with the high-pressure slip-casting pipe that is connected mortar pump and water pump respectively, interior cover connects at least one defeated slurry water-supply-pipe by intercommunicating pore, defeated slurry water-supply-pipe is attached to the screw pile tube wall, and outlet is at the drill bit grouting port.
Between the inside and outside cover of above-mentioned rotation filling adaptor sealing ring is arranged.
Above-mentioned swivel bearing is ball bearing or wear-resisting copper sheathing.
Above-mentioned defeated slurry water-supply-pipe is attached to the screw pile inside pipe wall.
Above-mentioned defeated slurry water-supply-pipe is attached to screw pile pipe outer wall.
The key issue of the technical program is:
1, the treatment effect of precompressed, the pressure of direct determinant slip casting, pressure is big more, and it is big that then the slurries range of scatter is far away, the stake end increases area.And grouting pressure except the rated pressure restriction of equipment, also depends on the mud jacking counter-force that equipment provides.The present invention provides the slip casting counter-force by deadweight of stake machine and the side friction of screw pile pipe in soil.Behind the mortar depositing construction, for preventing grouting pressure loss, slurry reflux, concrete perfusion pile immediately.Therefore the present invention is applicable to the construction of " "forming column " long screw auger drilling deposited pile, CFG stake.
2, unit head by hollow of the long screw pouring piles of " pile " method construction, CFG stake, concrete, screw pile pipe are to the induction system of drill bit, and under rotation or non-rotary state, continuous pressure pours into.The construction of stake of the present invention end mortar pre-pressing because material difference, the pressure difference of carrying, needs, independently slurry delivery system totally disconnected with the transmission and concrete transmission system.Slip casting of the present invention, water filling (the water spray operation is required when creeping into) induction system are connected under the unit head through feed pipe for mortar (water pump is through water pipe) from mortar pump, the rotation filling adaptor at screw pile pipe top, filling adaptor is under rotation or non-rotary state, all can carry out slip casing by pressure through the inner or outside defeated slurry water-supply-pipe transporting water mud of screw pile pipe or water to the grouting port of drill bit, grouting port attaches one way valve.
Beneficial effect
The basic difference of the present invention and existing post-grouting technology is: to long screw auger drilling deposited pile, the CFG stake of " pile ", before concrete perfusion, carry out pile tip grouting in advance and handle; Its end mortar pre-pressing equipment is installed on the machine, the repeatable use.Its advantage has some:
1. handle by pre-mud jacking, reinforce the loosened soil under the long screw pouring piles stake end, improve the end resistance and the settling amount that reduces stake of stake.
2. pre-mud jacking can also make that the soil body in the certain limit obtains reinforcing around the stake end except that handling stake end loosened soil down, the stake of being constructed becomes the enlarged footing stake, and the permeability that grouting pressure is big more, grouting amount is many, native more is big more, and it is big more that the stake end expands; A part of cement paste is improved the pile side resistance of the above certain limit of stake end along oozing on the contact surface of screw pile pipe side and soil simultaneously.Because intensity height, the stake end of stake end soil expand factors such as head, pile side resistance raising, the bearing capacity of stake obviously improves.And bring more choice to Pile Foundations Design, solve the low problem that can't lay out pile of bearing capacity of single pile.
3. long-spiral drilling machine is constructed at argillic horizon, when " pole " phenomenon takes place, utilizes device of the present invention, sprays water in drilling process and creeps into.Because water from the drill bit ejection, is in the screw pile pipe of generation bonding and the active position between the soil; Spray water while creeping into simultaneously, water is evenly distributed in clay, stirs fully, can eliminate clay " pole " phenomenon of long screw pile machine in the construction of clay area basically, construction quality, the efficiency of construction of raising foundation pile.
4, this technology is carried out synchronously with long screw auger drilling deposited pile, the CFG stake of the construction of " pile " method, about 3～5 minutes of every pile mud jacking time, operation such as longly examine, record, roach cleaning, stake position are checked with the stake of the conventional construction of pile foundation and carry out synchronously, do not increase the engineering time substantially; The drill bit grouting port has one-way cock outward, can prevent from that the outer soil particle of grouting port from entering to result in blockage, and can slip casting guarantee that the cement paste in the pipe discharges smoothly, and also stoping simultaneously, the cement paste of pressure pile end and the concrete of perfusion reflux.Technological principle of the present invention is directly perceived, and technical application is reliable, applicable to the long screw auger drilling deposited pile and the CFG stake of " pile " method of employing construction.
Description of drawings
Fig. 1 is a construction sequence schematic diagram of the present invention;
Fig. 2 is the structural representation of apparatus of the present invention;
Fig. 3 is rotation filling adaptor vertical cross section figure, and defeated slurry water-supply-pipe is installed in screw pile pipe inboard;
Fig. 4 is an I-I sectional drawing among Fig. 3;
Fig. 5 is the screw pile pipe cross-sectional view that defeated slurry water-supply-pipe is installed in screw pile pipe inboard;
Fig. 6 is rotation filling adaptor vertical cross section figure, and defeated slurry water-supply-pipe is installed in the screw pile pipe outside;
Fig. 7 is an I-I sectional drawing among Fig. 6;
Fig. 8 is the screw pile pipe cross-sectional view that defeated slurry water-supply-pipe is installed in the screw pile pipe outside;
Fig. 9 is the scheme of installation of rotation filling adaptor;
Figure 10 is the structural representation of slip casting drill bit.
Among the figure: cover, 18-overcoat, 19-annular feeding chamber, 20-bearing, 21-intercommunicating pore, 22-sealing ring, 23-flange, 24-helical blade, 25-one way valve, 26-retainer ring in 1-unit head, 2-reinforcing cage, 3-drill bit, 4-screw pile pipe, 5-mainframe, 6-high-pressure slip-casting pipe, 7-carrier pipe, 8-water pipe, 9-mortar pump, 10-water pump, 11-concrete pump, 12-rotation filling adaptor, 13-fixed support, the defeated slurry of 14-water-supply-pipe, 15-discharging opening, 16-grouting port, the 17-.
The specific embodiment
The main construction sequence of embodiment one deposited reinforced concrete pile and the device as shown in Figure 1, 2:
Step a
1Following brill, a
2The soil in the boring is discharged in screw pile pipe 4 rotary drillings of long screw pile machine, to projected depth, stops boring;
Behind step b, the pore-forming, the screw pile pipe is not extracted, start mortar pump 9 and carry out slip casing by pressure, cement paste is failed in the slurry water-supply-pipe 14 to drill bit grouting port 16 through high pressure feed pipe for mortar 6, rotation filling adaptor 12, steel, the stake end is carried out pre-mud jacking, the reinforcing stake end loosened soil and the stake end soil body on every side, in the slip casting process, the screw pile pipe can rotate or not change;
Step c
1Start concrete pump 11, pumping of concrete to drill bit discharging opening 15, carries out pressure injection, step c through carrier pipe 7, screw pile pipe 4
2Tube drawing, one-tenth CFG stake.
Steps d
1Place reinforcing cage 2, steps d
2Finish bored pile.
Behind the pile or in the formation of pile,, start water pump 10 if any the pole phenomenon, water is through rotation filling adaptor 12, and to drill bit 3, water spray creeps into along the defeated slurry of steel water-supply-pipe 14, water to drill bit 3, cleans residual cement paste and clay along the defeated slurry of steel water-supply-pipe 14 through rotation filling adaptor 12.
Embodiment two; The main technique step of the CFG stake of no-reinforcing-bar cage:
Screw pile pipe 4 rotary drillings of a, long auger stake machine are discharged the roach in the boring, to the projected depth pore-forming.When the stake machine is constructed in the clay area, when the influence of " pole " phenomenon occurring and creeping into, start water pump 10, current through water pipe 8, rotation filling adaptor 12, be installed in steel pipe 14 on the screw pile pipe to drill bit 3, through grouting port 16 ejections, continue to creep into to projected depth or termination of pumping after passing argillic horizon.
Behind b, the pore-forming, screw pile pipe 4 is not extracted.Start mortar pump 9, cement paste is failed slurry water-supply-pipe 14 to drill bit 3, through grouting port 16 slip castings through high pressure feed pipe for mortar 6, rotation filling adaptor 12, steel.In the slip casting process, screw pile pipe 4 can rotate or not change as requested.
After c, slip casting finish, start concrete pump 11, to drill bit 3, from discharging opening 15 perfusions, synchronization onwards is pulled out screw pile pipe pile to concrete soil during perfusion through carrier pipe 7, screw pile pipe 4, and CFG stake is so far finished.
Follow-up pile driving construction is prepared in the displacement of stake machine.In order to clean residual cement paste in rotation filling adaptor 12 inside, the ring-like slip casting chamber, start water pump 10 simultaneously, the grouting port 16 that is filled to drill bit 3 begins to stop behind the water spray.Purpose is to clean in the rotation filling adaptor residual cement paste in the annular slip casting chamber, avoids in the follow-up pile driving construction, and solidify because of fricative heat makes residual water mud at rotation filling adaptor place, stops up defeated slurry system.
The stake end mortar pre-pressing device of long screw auger drilling deposited pile, CFG stake, shown in Fig. 2～10, unit head 1 is installed on the mainframe 5, between unit head and screw pile pipe, rotation filling adaptor 12 is installed, be connected with unit head flange 23 above the rotation filling adaptor, be connected with the screw pile pipe flange below, be connected on the unit head by fixed support 13, screw pile pipe 4 centers are carrier pipe 7, concrete is by concrete pump 11 pumpings, rotation filling adaptor 12 outsides one side connects mortar pump 9 and high pressure feed pipe for mortar 6, and opposite side 180 degree at interval connects water pump 10 and water pipe 8.
Rotation filling adaptor 12 is made up of the inside and outside cover of steel, inside and outside inner room is installed wear-resisting copper sheathing or ball bearing 20, and with O RunddichtringO 22 or rubber seal, the slit, lower end is fixing by retainer ring 26, overcoat is fixed on the support 13 of unit head, does not rotate with the screw pile pipe; Interior cover 17 is unfixed, communicates with cored screw stake pipe 4 and rotation synchronously, is used for concrete transfer passage; Overcoat 18 middle part ring-type evaginations, and form an annular feeding chamber 19 between the interior cover 17, this chamber overcoat can connect high-pressure slip-casting pipe 6 and water pipe 8 respectively behind the side connection tee piece, and high-pressure slip-casting pipe 6 is connected with mortar pump 9, and water pipe 8 is connected with water pump 10.Interior cover 17 sidewalls are opened an intercommunicating pore 21, connect one or the two defeated slurry of steels water-supply-pipes 14, drill bit 3 bottom band grouting port 16 and concrete discharging openings 15, band one way valve 25 on the grouting port.The defeated slurry of steel water-supply-pipe 14 can be attached to screw pile pipe 4 inboards or the outside, and the screw pile pipe has helical blade 24 outward.
Mudjack and ducts rated pressure should be less than 5.0Mpa.The preparation cement paste, under normal circumstances the pressure of 0.6～0.8Mpa can make cement paste begin to discharge from the grout outlet of slip casting drill bit down, and termination pressure is not less than 0.5Mpa.The cement paste proportioning is: water: cement: Admixture is 0.5～0.8: 1: 0.02～0.05.
Claims (6)
1, the stake end mortar pre-pressing construction method of a kind of long screw auger drilling deposited pile, CFG stake the steps include:
The screw pile pipe rotary drilling of a, long screw pile machine is discharged the soil in the boring, to projected depth;
Behind b, the pore-forming, the screw pile pipe is not extracted, and starts mortar pump and carries out slip casing by pressure, and cement paste to the drill bit grouting port, carries out pre-mud jacking to the stake end in high pressure feed pipe for mortar, rotation filling adaptor, defeated slurry water-supply-pipe, the reinforcing stake end loosened soil and the stake end soil body on every side;
C, start concrete pump, pumping of concrete to the drill bit discharging opening, carries out pressure injection through carrier pipe, screw pile pipe, and tube drawing, pile synchronously.
Behind d, the pile, place reinforcing cage, finish bored pile.
E, in said process, start water pump, water spray creeps into, water flows out along defeated slurry water-supply-pipe to drill bit, cleans in the rotation filling adaptor residual cement paste or " pole " clay in the annular feeding chamber.
2, a kind of long screw auger drilling deposited pile, the stake end mortar pre-pressing device of CFG stake, the screw pile pipe is arranged on mainframe, dynamic head on the screw pile pipe, under drill bit is arranged, screw pile pipe tube core connects elephant trunk and concrete pump, it is characterized in that: between screw pile pipe top and unit head, fixedly connected a rotation filling adaptor, the rotation filling adaptor is by combining through swivel bearing with the interior cover of screw pile pipe rotation and fixing overcoat, form an annular feeding chamber between overcoat and the interior cover middle part, the sleeve side wall in this chamber is connected with water pipe with the high-pressure slip-casting pipe that is connected mortar pump and water pump respectively, interior cover connects at least one defeated slurry water-supply-pipe by intercommunicating pore, defeated slurry water-supply-pipe is attached to the screw pile tube wall, and outlet is at the drill bit grouting port.
3, the stake end mortar pre-pressing device of long screw auger drilling deposited pile according to claim 2, CFG stake is characterized in that: between the inside and outside cover of described rotation filling adaptor sealing ring is arranged.
4, the stake end mortar pre-pressing device of long screw auger drilling deposited pile according to claim 2, CFG stake, it is characterized in that: described swivel bearing is ball bearing or wear-resisting copper sheathing.
5, the stake end mortar pre-pressing device of long screw auger drilling deposited pile according to claim 2, CFG stake, it is characterized in that: described defeated slurry water-supply-pipe is attached to the screw pile inside pipe wall.
6, the stake end mortar pre-pressing device of long screw auger drilling deposited pile according to claim 2, CFG stake, it is characterized in that: described defeated slurry water-supply-pipe is attached to screw pile pipe outer wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021038554A CN1177109C (en) | 2002-04-04 | 2002-04-04 | Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021038554A CN1177109C (en) | 2002-04-04 | 2002-04-04 | Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1370893A CN1370893A (en) | 2002-09-25 |
| CN1177109C true CN1177109C (en) | 2004-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021038554A Expired - Fee Related CN1177109C (en) | 2002-04-04 | 2002-04-04 | Pile end mortar pre-pressing construction method and apparatus for long screw auger drilling deposited pile and CFG pile |
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| CN103791200A (en) * | 2012-10-26 | 2014-05-14 | 中国机械工业建设集团有限公司 | Equipment installation mud jacking construction method |
| CN103046544B (en) * | 2013-01-25 | 2015-07-15 | 汤保新 | Spinning pile, spinning pile waist and spinning pile head |
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- 2002-04-04 CN CNB021038554A patent/CN1177109C/en not_active Expired - Fee Related
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