CN102127910A - Method for constructing soil-cement composite foundation pile as core tubular pile - Google Patents
Method for constructing soil-cement composite foundation pile as core tubular pile Download PDFInfo
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Abstract
The invention relates to a method for constructing a soil-cement composite foundation pile as a core tubular pile. The method is characterized by comprising the following steps of: constructing an outer soil-cement pile by a high-pressure injection merging stirring method; closing the upper end and the lower end of a core pile; concentrically and statically pressing the core pile to a designed elevation before outer soil-cement is primarily congealed; and filling micro-expansion concrete of C30-C80 in a range of 6-10 times the pile diameter of the upper part of the core pile and arranging 4-8 anchoring steel bars. The invention solves the limitation of high-strength prestress tubular piles applied to high-rise buildings and high-intensity areas.
Description
Technical field
The present invention relates to a kind of high-bearing capacity foundation pile that uses in soft clay area, insert in promptly a kind of major diameter cement earth pile and fill out the foundation pile that the core high-strength Prestressed Pipe Pile is composited.
Background technology
Skin open at present and that use can be divided into two kind as the composite pile of pile tube according to the pile size as cement-soil, inner core, and a kind of is intermediate diameters stake type, and a kind of is the large diameter pile type.
Intermediate diameters stake type is that outer cement earth pile is formed by deep mixing method or high-pressure rotary spraying method, and the center is inserted the medium-small diameter pile tube and formed.Intermediate diameters stake type is owing to being limited by a piling method and a stake construction equipment, and the stake footpath concentrates between 500 ~ 700mm, and the stake appearance is to shorter, and a bearing capacity that provides is still relatively low, and generally uses as strengthening body in the composite foundation.
Chinese patent application 200710113491.0 discloses a kind of composite pile, comprises a core and is wrapped in the outer outer stake of a core, and outer stake is a cement earth pile, it is characterized in that described stake core is that the cross section is the prestressed concrete pipe pile of annular.The diameter of described cement earth pile is 800-1500mm, and length is 20-30m, and described stake core is 7-15m by more piece length, and diameter is 300mm, and 400mm or 500mm prestressed concrete pipe pile are connected into, and the strength grade of prestressed concrete pipe pile is C60 or C80.The two advantage of cement earth pile and reinforced concrete pile is concentrated in this NEW TYPE OF COMPOSITE stake, bear vertical load by prestressed concrete pipe pile as the stake core, cement earth pile with larger cross-section transmits pile side friction, can farthest give play to the ultimate bearing capacity of prestressed concrete pipe pile, its force mechanism is clear and definite, the bearing capacity of single pile height, reliable in quality; When inserting pile tube, cement earth pile there is compacted effect, can improves the adhesion between a soil.Compare under the friction pile condition with other foundation pile, can save amount of reinforcement greatly, reduce construction costs.The NEW TYPE OF COMPOSITE stake can realize low noise, friction construction, and environment is not had influence.Vertical bearing capacity of single pile characteristic value 940kN-2700kN.
Chinese patent application 200710113495.9 discloses a kind of large load composite pile, with the main distinction of above-mentioned composite pile be that outer stake is plain concrete pile, vertical bearing capacity of single pile characteristic value 1000kN-3000kN, bear vertical load jointly by high strength prestressed concrete pipe pile and plain concrete pile, heavy in section low grade plain concrete pile has increased pile side friction, can farthest give play to the ultimate bearing capacity of high strength prestressed concrete pipe pile; When inserting pile tube, plain concrete pile there is a kind of compacted effect, can improves the density of plain concrete, the effect of hole enlargement and the native adhesion of enhancing stake is arranged.Under, the same terms such as stake footpath etc. long in geology and stake, compare with other foundation piles, its vertical bearing capacity of single pile is big, can significantly reduce amount of reinforcement, and cost is low.Can realize low noise, friction construction, little to ambient influnence, applied range.
The vertical ultimate bearing capacity of single pile standard value refers to single pile many corresponding maximum loads before vertical uniform load q is issued to collapse state or during the distortion that occurs being unsuitable for continuing to carry, depend on support resistance and the bearing capacity of pile of soil to stake, promptly soil should be given full play to simultaneously to the support resistance and the bearing capacity of pile of stake.But there is defective like this in present disclosed major diameter composite pile: (1) does not provide core stake and the physical dimension of outer stake and the economic matching relationship of intensity, cause all soil of core pile material intensity and stake can not give full play to simultaneously, and then increased unit bearing capacity cost the pile side friction that outer cement-soil provides; (2) bearing capacity of single pile is determined by the prestressed concrete pipe pile pile body structural bearing capacity as the core stake, bearing capacity of single pile improves restricted, tend to cause the core pile capacity to reach the limit and outer cement earth pile side friction is not also brought into play fully, be that core stake and outer cement earth pile do not reach economic matching relationship, have outer cement earth pile side friction wasting phenomenon; Even the pile side friction that all soil of core pile material intensity and stake provides outer cement-soil reaches capacity simultaneously,, also limited outer cement earth pile diameter and be 1500mm to the maximum owing to bearing capacity of single pile is determined by core stake pile body structural bearing capacity; (3) connectivity problem of unresolved and cushion cap can't directly use as foundation pile, and when strengthening body and use as composite foundation, occurs outer cement-soil easily and destroys earlier and then cause pile tube to press bad phenomenon of explosion; (4) job practices is simple, and the detailed technology parameter and the safeguard measure that reach designing requirement are not provided, and is difficult to instruct concrete enforcement.
Summary of the invention
The technical problem to be solved in the present invention is: (1) propose the prestressed concrete pipe pile that uses as the core stake be wrapped in around the core stake outer cement earth pile between the two physical dimension (comprising that external diameter is long with stake) and the economic matching relationship of intensity, reduce unit bearing capacity cost; (2) solve the problem that bearing capacity of single pile is subjected to the restriction of core stake pile shaft material intensity, significantly improve bearing capacity of single pile, increase outer cement earth pile economic diameter; When (3) proposing composite pile and use as foundation pile with the method for attachment of cushion cap, the destruction problem when avoiding composite pile as the use of enhancing body; (4) propose outer cement-soil pile and with the high-strength Prestressed Pipe Pile cohesive process in technical data and safeguard measure, improve efficiency of construction; (5) a kind of foundation pile that core high-strength prestressed concrete pipe pile and major diameter cement earth pile are composited of filling out is proposed on the basis that addresses the above problem.
The technical solution adopted for the present invention to solve the technical problems is: a kind of core filling tubular pile cement composite foundation pile, comprise the core stake and be wrapped in core stake cement earth pile on every side, it is characterized in that: the diameter of described cement earth pile is that 800 ~ 2000mm, length are 12 ~ 40m; Described core stake is a high-strength Prestressed Pipe Pile, and the diameter of described high-strength Prestressed Pipe Pile is 300 ~ 1000mm, and length is 6 ~ 30m; The diameter ratio of described high-strength Prestressed Pipe Pile and cement earth pile is 0.375 ~ 0.50, length ratio is 0.50 ~ 0.76; After the sealing of high-strength Prestressed Pipe Pile upper and lower side, before outer cement-soil initial set, be pressed into to design elevation from outer cement earth pile centres static(al);
On described cement earth pile top and cement earth pile be positioned at part below the high-strength Prestressed Pipe Pile bottom multiple spray section be set respectively, the described segment length of spraying again is 2 ~ 6m;
In high-strength Prestressed Pipe Pile top is hollow, insert the slightly expanded concrete of strength grade C30 ~ C80, fill out core concrete length and be high-strength Prestressed Pipe Pile stake footpath 6 ~ 10 times.
Be subjected to the restriction of core stake pile body structural bearing capacity and the bearing capacity of improving the standard in order to break through bearing capacity of single pile, in high-strength Prestressed Pipe Pile top is hollow, insert the slightly expanded concrete of strength grade C30 ~ C80, fill out core concrete length and be core stake stake footpath 6 ~ 10 times, on outer cement earth pile top and each 2 ~ 6m scope below the core stake bottom carry out multiple spray and form multiple spray section;
When inserting in order to increase the core stake to the compacted effect of ambient water earth, improve vertical bearing capacity and be convenient to fill out core, before the insertion, the high-strength Prestressed Pipe Pile upper and lower side seals with sheet iron respectively.
In order to use as foundation pile, fill out in high-strength Prestressed Pipe Pile 4 ~ 8 anchor bars are set in the core concrete, high-strength Prestressed Pipe Pile stake top and anchor rib are anchored into top cushion cap formation pile foundation.
Described cement earth pile merges the paddling process construction by high-pressure injection, comprise the steps: that with three fulcrum type crawler belt pile drivers be pile frame, the drilling rod top that be arranged in parallel with pile frame is provided with the high-pressure rotary-spray water tap, unit head, the drilling rod bottom is provided with puddler, level is to nozzle, vertical nozzle and drill bit, drilling rod is by high-pressure rotary-spray water tap and high-pressure mortar spraying, gas ejecting system connects the speed whitewashing of back with 2 ~ 5m/min, jet sinking, after sinking down into design elevation, speed whitewashing according to 20 ~ 25cm/min, jet lifting, and on cement earth pile top and be positioned at part below the core stake bottom at cement earth pile multiple spray section is set respectively, described multiple spray section is 2 ~ 6m; Rod rotation speed 20 ~ 30r/min, cement paste pressure 2 ~ 30MPa, flow 35 ~ 320L/min, air pressure 0.6 ~ 0.7MPa, flow 3 ~ 6m
3/ min; When meeting local hardpan, guarantee that by increasing vertical nozzle spray pressure subsidence velocity is not less than 2m/min, vertical nozzle spray pressure increase amplitude is 5 ~ 10MPa.
In order to increase drilling tool subsidence velocity in the local hardpan, improve pile efficient, vertical nozzle is set and guarantees that by increasing vertical nozzle spray pressure subsidence velocity is not less than 2m/min in the drilling rod bottom, vertical nozzle spray pressure increase amplitude is 5 ~ 10MPa.
A kind of job practices of core filling tubular pile cement composite foundation pile is characterized in that it comprises the steps: that (a) outer cement earth pile merges the paddling process construction by high-pressure injection; (b) two ends about the stake of sealing core; (c) before outer cement-soil initial set, be pressed into high-strength Prestressed Pipe Pile to design elevation at cement earth pile centres static(al); (d) 6 ~ 10 times of stake footpaths, high-strength Prestressed Pipe Pile top scope is inserted C30 ~ C80 slightly expanded concrete and 4 ~ 8 anchor bars is set.
Because composite foundation pile of the present invention is pushed up with cement earth pile, stake around being wrapped in the core stake by the high-strength Prestressed Pipe Pile as the core stake that is the specific quantity matching relationship and the multiple anchor bar of filling out core concrete, being connected with cushion cap that sprays section, high-strength Prestressed Pipe Pile top length-specific of bottom, core stake bottom cement earth pile length-specific is formed, and adopt the said method construction, so produced following beneficial effect:
(1) solved cement earth pile, high-strength Prestressed Pipe Pile application limit separately, can give full play to native side friction and the high-strength Prestressed Pipe Pile pile body structural bearing capacity that outer cement earth pile is provided of stake week simultaneously, increase substantially core filling tubular pile cement composite foundation pile vertical bearing capacity of the present invention, reduce construction costs, the bearing capacity of single pile characteristic value can reach 10000kN(Fig. 3,4), compare that bearing capacity of single pile improves about 2 times in the open source information, unit bearing capacity cost is compared the simple composite situation and is reduced by 30 ~ 60%(Fig. 5,6);
(2) broken through the defective that bearing capacity of single pile is controlled by core stake pile body structural bearing capacity, compare core stake pile body structural bearing capacity and improve 40 ~ 100%, giving full play to for outer cement earth pile side friction provides guarantee, makes the maximum economic diameter of outer cement earth pile can expand 2000mm to; Eliminated horizontal loading when big the core stake easily produce the problem of shearing resistance brittle fracture, can bear big horizontal loading, compare raising 80 ~ 150% with composite pile horizontal bearing capacity in the prior art or same size pile tube, solved high-strength Prestressed Pipe Pile in highrise building and high earthquake intensity area application limit;
(3) solved when composite pile uses as foundation pile and the method for attachment of cushion cap, outer cement-soil destroys earlier and then causes pile tube to be pressed quick-fried problem when having avoided strengthening body and using as composite foundation;
When (4) having increased the core stake and inserted to around and the compacted effect of bottom cement-soil, improved the adhesion stress at outer cement-soil and core stake interface, can carry on a shoulder pole load to the core pile and farthest be diffused on every side in the ground cement-soil and soil, force mechanism is clear and definite;
(5) effectively shorten drilling tool sinking time in the local hardpan, significantly improve efficiency of construction, reduce cement consumption, compared with prior art efficiency of construction improves about 90 ~ 120%.
Description of drawings
Fig. 1 is a major diameter core filling tubular pile cement composite foundation pile generalized section;
Fig. 2 is a major diameter core filling tubular pile cement composite foundation pile schematic cross-section;
Fig. 3 compares variation diagram than bearing capacity of single pile characteristic value under the condition with length for different-diameter;
Fig. 4 compares variation diagram than bearing capacity of single pile characteristic value under the condition with diameter for different length;
Fig. 5 compares variation diagram than unit bearing capacity cost under the condition with length for different-diameter;
Fig. 6 compares variation diagram than unit bearing capacity cost under the condition with diameter for different length;
Among the figure: 1-high-strength Prestressed Pipe Pile, 2-cement earth pile, 3-multiple spray section, 4-fill out core concrete, 5-anchor bar.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is done to describe in further detail.
Shown in Fig. 1 ~ 2, by as the high-strength Prestressed Pipe Pile 1 of core stake, core concrete 4 is filled out at the section of spray 3, high-strength Prestressed Pipe Pile top again, the anchor bar 5 that is connected with cushion cap forms to be wrapped in high-pressure injection stirring concrete earth pile 2, stake top and bottom, core stake bottom cement earth pile around the core stake.
A kind of job practices of core filling tubular pile cement composite foundation pile is characterized in that it comprises the steps: that (a) outer cement earth pile merges the paddling process construction by high-pressure injection; (b) two ends about the stake of sealing core; (c) before outer cement-soil initial set, be pressed into high-strength Prestressed Pipe Pile to design elevation at cement earth pile centres static(al); (d) 6 ~ 10 times of stake footpaths, high-strength Prestressed Pipe Pile top scope is inserted C30 ~ C80 slightly expanded concrete and 4 ~ 8 anchor bars is set.
Described cement earth pile merges the paddling process construction by high-pressure injection, comprise the steps: that with three fulcrum type crawler belt pile drivers be pile frame, the drilling rod top that be arranged in parallel with pile frame is provided with high-pressure rotary-spray water tap, unit head, the drilling rod bottom is provided with puddler, level to nozzle, vertical nozzle and drill bit, drilling rod is connected the back with the speed whitewashing of 2 ~ 5m/min, jet sinking by the high-pressure rotary-spray water tap with high-pressure mortar spraying, gas ejecting system, rod rotation speed 20 ~ 30r/min, cement paste pressure 2 ~ 30MPa, flow 35 ~ 320L/min, air pressure 0.6 ~ 0.7MPa, flow 3 ~ 6m
3/ min when meeting local hardpan, guarantees that by increasing vertical nozzle spray pressure subsidence velocity is not less than 2m/min, and vertical nozzle spray pressure increase amplitude is 5 ~ 10MPa.After sinking down into design elevation, according to the whitewashing of the speed of 20 ~ 25cm/min, jet lifting, and carry out multiple spray on stake top and below the core stake bottom in each 2 ~ 6m scope, the formation diameter is that 800 ~ 2000mm, length are the outer cement earth pile 2 of 12 ~ 40m.Principle according to stake footpath ratio 0.375 ~ 0.50, the long ratio 0.50 ~ 0.76 of stake is selected high-strength Prestressed Pipe Pile 1, respective diameters is that 300 ~ 1000mm, length are 6 ~ 30m, after the upper and lower side sealing, before outer cement-soil initial set, insert in the cement earth pile 2 with one heart to design elevation; Insert C30 ~ C80 slightly expanded concrete in the scope of 6 ~ 10 times of stakes footpath, high-strength Prestressed Pipe Pile 1 top as filling out core concrete 4, and the anchor bar 5 that is connected with the top cushion cap of setting.
A kind of job practices of core filling tubular pile cement composite foundation pile is characterized in that it comprises the steps: that (a) outer cement earth pile merges the paddling process construction by high-pressure injection; (b) two ends about the stake of sealing core; (c) before outer cement-soil initial set, be pressed into high-strength Prestressed Pipe Pile to design elevation at cement earth pile centres static(al); (d) 6 ~ 10 times of stake footpaths, high-strength Prestressed Pipe Pile top scope is inserted C30 ~ C80 slightly expanded concrete and 4 ~ 8 anchor bars is set.Described cement earth pile merges the paddling process construction by high-pressure injection, comprise the steps: that with three fulcrum type crawler belt pile drivers be pile frame, the drilling rod top that be arranged in parallel with pile frame is provided with high-pressure rotary-spray water tap, unit head, the drilling rod bottom is provided with puddler, level to nozzle, vertical nozzle and drill bit, drilling rod is connected the back with the speed whitewashing of 2 ~ 5m/min, jet sinking by the high-pressure rotary-spray water tap with high-pressure mortar spraying, gas ejecting system, drill speed 23r/min, water/binder ratio 1.0, cement paste pressure 2MPa, flow 35.0L/min, air pressure 0.6 ~ 0.7MPa, flow 3 ~ 6m
3/ min, when meeting local hardpan, vertical nozzle spray pressure increases 5 ~ 10MPa and is not less than 2m/min to guarantee subsidence velocity.After drill bit sinks down into design elevation,, in stake top 2m, the following 2m scope in core stake bottom, carry out multiple spray, form the outer cement earth pile 2 of diameter 800mm, length 12m according to the speed whitewashing of 20 ~ 21cm/min, jet lifting.High-strength Prestressed Pipe Pile 1 upper and lower side of selecting diameter 300mm, length 6m for use with the sheet iron sealing after, before outer cement-soil initial set, insert in the cement earth pile 2 with one heart to design elevation; Fill the C50 slightly expanded concrete in the high-strength Prestressed Pipe Pile 1 top 2.0m scope as filling out core concrete 4, and the HRB335 anchor bar 5 of four diameter 16mm being connected with the top cushion cap of setting.High-strength Prestressed Pipe Pile 1 and outer cement earth pile 2 diameter ratio are 0.375, length ratio is 0.50.
Test shows that the bearing capacity of single pile characteristic value is 1360kN, is composite pile integral body and thrusts failure mode, compares core stake pile body structural bearing capacity 900kN and improves 51%, has broken through the defective that bearing capacity of single pile is controlled by core stake pile body structural bearing capacity; Outer cement earth pile side friction average is 85kPa, compares side friction 54kPa raising 57% among the embodiment 2, can give full play to outer cement earth pile side friction; Unit bearing capacity cost is 12.5 yuan/10kN, reduces by 33% than 18.7 yuan/10kN of unit bearing capacity cost among the embodiment 2; The horizontal bearing capacity of single pile characteristic value is 49kN, compares horizontal bearing capacity characteristic value 23kN raising 113% among the embodiment 2; Outer cement earth pile efficiency of construction is 8.0m/h, compares and adopts the efficiency of construction 4.1m/h that vertical nozzle drilling tool is not set to improve 95% among the embodiment 2.
Embodiment 2(Comparative Examples)
Adopt the drilling tool that vertical nozzle is not set in the present open source information, multiple spray section 3 is not set, fills out core concrete 4 and anchor bar 5, core stake upper and lower side does not seal, and all the other parameters and job practices are with embodiment 1.
Test shows that the bearing capacity of single pile characteristic value is 910kN, and 900kN is very approaching with core stake pile body structural bearing capacity, and promptly bearing capacity of single pile is controlled by core stake pile body structural bearing capacity; Do not strengthen section owing to there is multiple spray, failure mode is that outer cement-soil is at first crushed and then cause the core stake in the quick-fried fracture of following 40cm place, pipe top quilt pressure; Outer cement earth pile side friction average is 54kPa, compares side friction 85kPa reduction by 36% among the embodiment 1, fails to give full play of outer cement earth pile side friction; Unit bearing capacity cost is 18.7 yuan/10kN, than increasing by 50% according to 12.5 yuan/10kN of unit bearing capacity cost among the embodiment 1 of the art of this patent scheme implementation; The horizontal bearing capacity of single pile characteristic value is 23kN, compares horizontal bearing capacity of single pile characteristic value 49kN reduction by 53% among the embodiment 1; Because the drilling tool sinking is slower in the local hardpan, outer cement earth pile efficiency of construction is 4.1m/h, compares and adopts the efficiency of construction 8.0m/h that vertical nozzle drilling tool is set to reduce by 49% among the embodiment 1; Because core stake two ends do not have sealing, cement-soil is full of core pile center position substantially in the lock pin process, hinders to fill out the core construction.
Present embodiment and embodiment 1 something in common repeat no more, and difference is: cement paste pressure 7MPa, flow 66.0L/min, in stake top 3m, the following 4m scope in core stake bottom, carry out multiple spray, and form the outer cement earth pile 2 of diameter 1000mm, length 16m.High-strength Prestressed Pipe Pile 1 upper and lower side of selecting diameter 400mm, length 10m for use with the sheet iron sealing after, before outer cement-soil initial set, insert in the cement earth pile 2 with one heart to design elevation; Fill the C60 slightly expanded concrete in the high-strength Prestressed Pipe Pile 1 top 3.5m scope as filling out core concrete 4, and the HRB335 anchor bar 5 of four diameter 16mm being connected with the top cushion cap of setting.High-strength Prestressed Pipe Pile 1 and outer cement earth pile 2 diameter ratio are 0.40, length ratio is 0.625.
Test shows that the bearing capacity of single pile characteristic value is 2520kN, is composite pile integral body and thrusts failure mode, compares core stake pile body structural bearing capacity 1650kN and improves 53%, has broken through the defective that bearing capacity of single pile is controlled by core stake pile body structural bearing capacity; Outer cement earth pile side friction average is 100kPa, compares side friction 64kPa raising 56% among the embodiment 4, can give full play to outer cement earth pile side friction; Unit bearing capacity cost is 12.6 yuan/10kN, reduces by 36% than 19.8 yuan/10kN of unit bearing capacity cost among the embodiment 4; The horizontal bearing capacity of single pile characteristic value is 65kN, compares horizontal bearing capacity characteristic value 35kN raising 86% among the embodiment 4; Outer cement earth pile efficiency of construction is 8.4m/h, compares and adopts the efficiency of construction 3.9m/h that vertical nozzle drilling tool is not set to improve 115% among the embodiment 4.
Embodiment 4(Comparative Examples)
Adopt the drilling tool that vertical nozzle is not set in the present open source information, multiple spray section 3 is not set, fills out core concrete 4 and anchor bar 5, core stake upper and lower side does not seal, and all the other parameters and job practices are with embodiment 3.
Test shows that the bearing capacity of single pile characteristic value is 1600kN, and it is smaller to compare core stake pile body structural bearing capacity 1650kN, and bearing capacity of single pile is controlled by core stake pile body structural bearing capacity; Do not strengthen section owing to there is multiple spray, failure mode is that outer cement-soil is at first crushed and then cause the core stake in the quick-fried fracture of following 38cm place, pipe top quilt pressure; Outer cement earth pile side friction average is 64kPa, compares side friction 100kPa reduction by 36% among the embodiment 3, fails to give full play of outer cement earth pile side friction; Unit bearing capacity cost is 19.8 yuan/10kN, than increasing by 57% according to 12.6 yuan/10kN of unit bearing capacity cost among the embodiment 3 of the art of this patent scheme implementation; The horizontal bearing capacity of single pile characteristic value is 35kN, compares horizontal bearing capacity of single pile characteristic value 65kN reduction by 49% among the embodiment 3; Because the drilling tool sinking is slower in the local hardpan, outer cement earth pile efficiency of construction is 3.9m/h, compares and adopts the efficiency of construction 8.4m/h that vertical nozzle drilling tool is set to reduce by 54% among the embodiment 3; Because core stake two ends do not have sealing, cement-soil is full of core pile center position substantially in the lock pin process, hinders to fill out the core construction.
Present embodiment and embodiment 1 something in common repeat no more, and difference is: cement paste pressure 9MPa, flow 80.0L/min, in stake top 4m, the following 5m scope in core stake bottom, carry out multiple spray, and form the outer cement earth pile 2 of diameter 1200mm, length 21m.High-strength Prestressed Pipe Pile 1 upper and lower side of selecting diameter 500mm, length 16m for use with the sheet iron sealing after, before outer cement-soil initial set, insert cement earth pile 2 with one heart; Fill C80 slightly expanded concrete core in the high-strength Prestressed Pipe Pile 1 top 4.0m scope as filling out core concrete 4, and the HRB335 anchor bar 5 of 4 diameter 18mm being connected with the top cushion cap of setting.High-strength Prestressed Pipe Pile 1 and outer cement earth pile 2 diameter ratio are 0.42, length ratio is 0.76.
Test shows that the bearing capacity of single pile characteristic value is 3840kN, compares core stake pile body structural bearing capacity 2700kN and improves 42%, has broken through the defective that bearing capacity of single pile is controlled by core stake pile body structural bearing capacity; Outer cement earth pile side friction average is 97kPa, compares side friction 35kPa raising 177% among the embodiment 6, can give full play to outer cement earth pile side friction; Unit bearing capacity cost is 12.4 yuan/10kN, reduces by 51% than 25.1 yuan/10kN of unit bearing capacity cost among the embodiment 6; The horizontal bearing capacity of single pile characteristic value is 89kN, improves 107% than same size pile tube horizontal bearing capacity characteristic value 43kN; Outer cement earth pile efficiency of construction is 8.4m/h, compares and adopts the efficiency of construction 4.3m/h that vertical nozzle drilling tool is not set to improve 95% among the embodiment 6.
Embodiment 6(Comparative Examples)
Adopt the drilling tool that vertical nozzle is not set in the present open source information outer cement earth pile 2 of constructing, diameter 1200mm, length 21m, the high-strength Prestressed Pipe Pile 1 of diameter 300mm, length 8m is adopted in the core stake.High-strength Prestressed Pipe Pile 1 and outer cement earth pile 2 diameter ratio are 0.25, length ratio is 0.38.All the other parameters and job practices are with embodiment 5.
Test shows that the bearing capacity of single pile characteristic value is 1400kN, compare core stake pile shaft material bearing capacity 900kN and improve 56%, has broken through the defective that bearing capacity of single pile is subjected to core pile material strength control; Outer cement earth pile side friction average is 35kPa, compares side friction 97kPa reduction by 64% among the embodiment 5, fails to give full play of outer cement earth pile side friction; Unit bearing capacity cost is 25.1 yuan/10kN, than increasing by 102% according to the 12.4/10kN of unit bearing capacity cost unit among the embodiment 5 of the art of this patent scheme implementation; Because the drilling tool sinking is slower in the local hardpan, outer cement earth pile efficiency of construction is 4.3m/h, compares and adopts the efficiency of construction 8.4m/h that vertical nozzle drilling tool is set to reduce by 49% among the embodiment 5.
Embodiment 7
Present embodiment and embodiment 1 something in common repeat no more, difference is: cement paste pressure 23MPa, flow 160.0L/min, in stake top 3.5m, the following 4m scope in core stake bottom, carry out multiple spray, form the outer cement earth pile 2 of diameter 1600mm, length 25m.High-strength Prestressed Pipe Pile 1 upper and lower side of selecting diameter 600mm, length 18m for use with the sheet iron sealing after, before outer cement-soil initial set, insert cement earth pile 2 with one heart; Fill the C70 slightly expanded concrete in the high-strength Prestressed Pipe Pile 1 top 6.0m scope as filling out core concrete 4, and the HRB335 anchor bar 5 of 6 diameter 18mm being connected with the top cushion cap of setting.High-strength Prestressed Pipe Pile 1 and outer cement earth pile 2 diameter ratio are 0.40, length ratio is 0.72.
Test shows that the bearing capacity of single pile characteristic value is 6000kN, and the maximum bearing capacity of single pile characteristic value of comparing in the present open source information improves 1 times; Compare core stake pile body structural bearing capacity 3550kN and improve 69%, broken through the defective that bearing capacity of single pile is controlled by core stake pile body structural bearing capacity; Outer cement earth pile side friction average is 95kPa, compares side friction 25kPa raising 280% among the embodiment 8, can give full play to outer cement earth pile side friction; Unit bearing capacity cost is 12.8 yuan/10kN, compares 26.6 yuan/10kN of unit bearing capacity cost reduction by 52% among the embodiment 8; The horizontal bearing capacity of single pile characteristic value reaches 105kN, improves 110% than same size pile tube horizontal bearing capacity characteristic value 50kN; Outer cement earth pile efficiency of construction is 8.6m/h, compares and adopts the efficiency of construction 4.4m/h that vertical nozzle drilling tool is not set to improve 95% among the embodiment 8.
Embodiment 8(Comparative Examples)
Adopt the drilling tool that vertical nozzle is not set in the present open source information outer cement earth pile 2 of constructing, diameter 1600mm, length 25m, the high-strength Prestressed Pipe Pile 1 of diameter 300mm, length 10m is adopted in the core stake.High-strength Prestressed Pipe Pile 1 and outer cement earth pile 2 diameter ratio are 0.1875, length ratio is 0.40.All the other parameters and job practices are with embodiment 7.
Test shows that the bearing capacity of single pile characteristic value is 1600kN, compare core stake pile shaft material bearing capacity 900kN and improve 78%, has broken through the defective that bearing capacity of single pile is subjected to core pile material strength control; Outer cement earth pile side friction average is 25kPa, compares side friction 95kPa reduction by 74% among the embodiment 7, fails to give full play of outer cement earth pile side friction; Unit bearing capacity cost is 26.6 yuan/10kN, than increasing by 108% according to 12.8 yuan/10kN of unit bearing capacity cost unit among the embodiment 7 of the art of this patent scheme implementation; Outer cement earth pile efficiency of construction is 4.4m/h, compares and adopts the efficiency of construction 8.6m/h that vertical nozzle drilling tool is set to reduce by 49% among the embodiment 7.
Embodiment 9
Present embodiment and embodiment 1 something in common repeat no more, difference is: cement paste pressure 30MPa, flow 320.0L/min, in stake top 6m, the following 6m scope in core stake bottom, carry out multiple spray, form the outer cement earth pile 2 of diameter 2000mm, length 40m.High-strength Prestressed Pipe Pile 1 upper and lower side of selecting diameter 1000mm, length 30m for use with the sheet iron sealing after, before outer cement-soil initial set, insert cement earth pile 2 with one heart; Fill the C30 slightly expanded concrete in the high-strength Prestressed Pipe Pile 1 top 6.0m scope as filling out core concrete 4, and the HRB335 anchor bar 5 of 8 diameter 20mm being connected with the top cushion cap of setting.High-strength Prestressed Pipe Pile 1 and cement earth pile 2 diameter ratio are 0.50, length ratio is 0.75.
Test shows that the bearing capacity of single pile characteristic value is 10000kN, and the maximum bearing capacity of single pile characteristic value of comparing in the present open source information improves 2 ~ 3 times; Compare core stake pile body structural bearing capacity 6600kN and improve 52%, broken through the defective that bearing capacity of single pile is controlled by core stake pile body structural bearing capacity; Outer cement earth pile side friction average is 80kPa, compares side friction 47kPa raising 70% among the embodiment 10, can give full play to outer cement earth pile side friction; Unit bearing capacity cost is 12.3 yuan/10kN, compares 19.6 yuan/10kN of unit bearing capacity cost reduction by 37% among the embodiment 10; The horizontal bearing capacity of single pile characteristic value is 270kN, improves 125% than same size pile tube horizontal bearing capacity characteristic value 120kN; Outer cement earth pile efficiency of construction is 9.8m/h, compares and adopts the efficiency of construction 5.1m/h that vertical nozzle drilling tool is not set to improve 92% among the embodiment 10.
Embodiment 10(Comparative Examples)
Adopt the drilling tool that vertical nozzle is not set in the present open source information outer cement earth pile 2 of constructing, diameter 2000mm, length 40m, the high-strength Prestressed Pipe Pile 1 of diameter 600mm, length 18m is adopted in the core stake.High-strength Prestressed Pipe Pile 1 and cement earth pile 2 diameter ratio are 0.30, length ratio is 0.45.All the other parameters and job practices are with embodiment 9.
Test shows that the bearing capacity of single pile characteristic value is 5900kN, compare core stake pile shaft material bearing capacity 3550kN and improve 66%, has broken through the defective that bearing capacity of single pile is subjected to core pile material strength control; Outer cement earth pile side friction average is 47kPa, compares side friction 80kPa reduction by 41% among the embodiment 9, fails to give full play of outer cement earth pile side friction; Unit bearing capacity cost is 19.6 yuan/10kN, than increasing by 59% according to 12.3 yuan/10kN of unit bearing capacity cost unit among the embodiment 9 of the art of this patent scheme implementation; Outer cement earth pile efficiency of construction is 5.1m/h, compares and adopts the efficiency of construction 9.8m/h that vertical nozzle drilling tool is set to reduce by 48% among the embodiment 9.
Brief summary
Closed at both ends effect when illustrating that multiple spray and core stake are inserted, according to relevant parameter among the embodiment 1,3,5,7,9 implemented not have multiple spray section respectively, totally 10 composite piles were not sealed under two kinds of operating modes at two ends when the core stake was inserted, contrast effect is as shown in table 1.Composite pile vertical bearing capacity of single pile characteristic value, horizontal bearing capacity characteristic value, outer cement earth pile side friction according to the art of this patent scheme implementation do not improve 19.8 ~ 29.5%, 16.7 ~ 35.0%, 19.4 ~ 28.8% than there being multiple spray section operating mode respectively, and corresponding unit bearing capacity cost reduces by 10.6 ~ 12.6%; Do not seal operating mode than core stake two ends and improve 20.0 ~ 23.9%, 5.0 ~ 10.2%, 20.3 ~ 24.4% respectively, corresponding unit bearing capacity cost reduces by 16.9 ~ 19.5%.
Multiple spray section of table 1 and the contrast of core stake closed at both ends effect
Claims (1)
1. the job practices of a core filling tubular pile cement composite foundation pile, it is characterized in that it comprises the steps: that (a) outer cement earth pile merges the paddling process construction by high-pressure injection, comprise the steps: that with three fulcrum type crawler belt pile drivers be pile frame, the drilling rod top that be arranged in parallel with pile frame is provided with the high-pressure rotary-spray water tap, unit head, the drilling rod bottom is provided with puddler, level is to nozzle, vertical nozzle and drill bit, drilling rod is by high-pressure rotary-spray water tap and high-pressure mortar spraying, gas ejecting system connects the speed whitewashing of back with 2 ~ 5m/min, jet sinking, after sinking down into design elevation, speed whitewashing according to 20 ~ 25cm/min, jet lifting, and on cement earth pile top and be positioned at part below the core stake bottom at cement earth pile multiple spray section is set respectively, described multiple spray section is 2 ~ 6m; Rod rotation speed 20 ~ 30r/min, cement paste pressure 2 ~ 30MPa, flow 35 ~ 320L/min, air pressure 0.6 ~ 0.7MPa, flow 3 ~ 6m
3/ min; When meeting local hardpan, guarantee that by increasing vertical nozzle spray pressure subsidence velocity is not less than 2m/min, vertical nozzle spray pressure increase amplitude is 5 ~ 10MPa; (b) two ends about the stake of sealing core; (c) before outer cement-soil initial set, be pressed into high-strength Prestressed Pipe Pile to design elevation at cement earth pile centres static(al); (d) 6 ~ 10 times of stake footpaths, high-strength Prestressed Pipe Pile top scope is inserted C30 ~ C80 slightly expanded concrete and 4 ~ 8 anchor bars is set.
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| CN107237325A (en) * | 2017-08-15 | 2017-10-10 | 张家港市兴鸿达基础有限公司 | A kind of pile foundation construction method of installation based on pre-installation hole |
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| CN102127910B (en) | 2012-02-01 |
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Address after: 250031 Shandong Province Flyover District of Ji'nan City Road 29. Co-patentee after: SHANDONG XINGUO FOUNDATION ENGINEERING Co.,Ltd. Patentee after: Shandong Academy of Building Science Co., Ltd Co-patentee after: SHANDONG LIAOJIAN GROUP Co.,Ltd. Address before: 250031 Shandong Province Flyover District of Ji'nan City Road 29. Co-patentee before: SHANDONG XINGUO FOUNDATION ENGINEERING Co.,Ltd. Patentee before: SHANDONG PROVINCIAL ACADEMY OF BUILDING RESEARCH Co-patentee before: SHANDONG LIAOJIAN GROUP Co.,Ltd. |
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