CN103669386A - Method for improving pile group bearing capacity by means of U-shaped row pile foundations - Google Patents
Method for improving pile group bearing capacity by means of U-shaped row pile foundations Download PDFInfo
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- CN103669386A CN103669386A CN201310742529.6A CN201310742529A CN103669386A CN 103669386 A CN103669386 A CN 103669386A CN 201310742529 A CN201310742529 A CN 201310742529A CN 103669386 A CN103669386 A CN 103669386A
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- 239000002689 soil Substances 0.000 description 15
- 238000010276 construction Methods 0.000 description 14
- 230000003014 reinforcing effect Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
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Abstract
The invention discloses a method for improving pile group bearing capacity by means of U-shaped row pile foundations. A pile group is composed of a plurality of rows of row pile foundations, each row pile foundation is formed by arranging a plurality of single piles, and the method is characterized by comprising the step of arranging a pile beam between the bottoms of adjacent single piles in each row pile foundation in a connection mode so as to increase the bottom bearing areas of the row pile foundations and enable the pile beam and the single piles to be of an integral structure. The method has the advantages that the pile group composed of the U-shaped row pile foundations is simple in structure, the pile beam for connecting the adjacent single piles is additionally arranged at the bottoms of the row pile foundations, strip-shaped pile feet or semicircular pile feet are additionally arranged at the bottoms of the single piles, therefore the whole bearing cross sections of the row pile foundations are increased, the whole bearing capacity and the anti-toppling capacity of the pile group are effectively improved, and compared with a conventional pile group foundation with the same bearing capacity, the length of each single pile is greatly shortened.
Description
Technical field
The invention belongs to pile foundation technical field, be specifically related to the method that pile group bearing capacity is improved on a kind of U of utilization font campshed basis.
Background technology
Campshed basis is the building pile basis structure arrange forming by queue-type with certain type, and it is large with bearing capacity, good stability, sedimentation value are little, can adapt to the features such as various geological conditionss and load situation and be widely applied in building, the hydraulic engineerings such as highrise building, large-sized workshop, water conservancy and hydropower hinge, railway engineering, highway engineering, bridge engineering, offshore production platform, nuclear power station.
Campshed basis specifically consists of jointly some foundation piles and the cushion cap that is connected in stake top, is used to the building on it that enough bearing capacities are provided; The load of building passes to ground by its below pile foundation, the frictional resistance that wherein vertical load is generally produced by the resistance of stake substratum and pile body side and the soil body supports, and that is to say that pile foundation is broadly divided into two kinds of end bearing pile and friction piles by Force principle.
As shown in Figure 1, it is hard soil layer or rock stratum that end bearing pile 1 reaches hard formation 3(through Soft Soil Layer 2), the superstructure load of end bearing pile 1 is mainly born by hard formation 3 resistances; During construction, take pile penetration as main, and pile top enters bearing stratum depth or pile top absolute altitude can be for referencial use.
As shown in Figure 2,4 of friction piles are arranged in Soft Soil Layer 2 completely, by its pile body by the compacted reality of Soft Soil Layer 2, to improve native compactness and supporting capacity, the load of its superstructure is born jointly by the frictional resistance between end-resistance and pile body side and Soft Soil Layer 2, during construction, take and control pile top design elevation as main, pile penetration can be for referencial use.
The existing problem of pile group consisting of campshed basis is at present: 1. in order to ensure it, to upper building, can provide enough bearing capacities, very big for the length requirement of pile body, the pressure that this has not only increased construction cost aspect, has also improved the difficulty of construction; 2. at adjacent foundation pile top, coupling beam is set conventionally and interconnects, to increase the resistance to overturning of pile group, but its effect is very limited, and cost is higher, affects the construction of upper building.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art part, provide a kind of U of utilization font campshed basis to improve the method for pile group bearing capacity, the method is interconnected to constitute one by crossbeam realization being set in each adjacent single pile bottom, to provide much larger than the loaded area on conventional campshed basis, improve the whole stress-bearing capability of pile group.
The object of the invention realizes and being completed by following technical scheme:
A kind of method of utilizing U font campshed basis to improve pile group bearing capacity, described pile group forms by arranging described campshed basis more, described campshed basis is rearranged by some single piles, it is characterized in that described method comprises the following steps: between each adjacent described single pile bottom, to connect a crossbeam is set in described campshed basis, to increase the bottom loaded area on described campshed basis, described stake crossbeam and described single pile are structure as a whole.
In described single pile bottom, footing is set, makes described footing and described single pile axis perpendicular.
The length of described footing is not more than as described single pile length.
Make described footing be strip, and centered by described single pile axis, be symmetrical arranged.
Make described footing be semicircle shape, and centered by described single pile axis, be symmetrical arranged.
Advantage of the present invention is, the pile group that should be comprised of U font campshed basis is simple in structure, by set up the stake crossbeam that connects adjacent single pile in campshed foundation bottom, and by setting up bar shaped footing or semicircle footing in each single pile bottom, to increase the whole pressure-bearing cross section on campshed basis, effectively improve whole bearing capacity and the resistance to capsizing of pile group, compare with the conventional pile group basis with equal bearing capacity, single pile length can shorten greatly.
Accompanying drawing explanation
Fig. 1 is end bearing pile schematic diagram in prior art;
Fig. 2 is friction pile schematic diagram in prior art;
Fig. 3 is the part elevation figure on U-shaped campshed basis in the embodiment of the present invention one;
Fig. 4 is the partial plan layout on U-shaped campshed basis in the embodiment of the present invention one;
Fig. 5 is the whole elevation on U-shaped campshed basis in the embodiment of the present invention one;
Fig. 6 is the part elevation figure on U-shaped campshed basis in the embodiment of the present invention two;
Fig. 7 is the partial plan layout on U-shaped campshed basis in the embodiment of the present invention two;
Fig. 8 is the part elevation figure on U-shaped campshed basis in the embodiment of the present invention three;
Fig. 9 is the partial plan layout on U-shaped campshed basis in the embodiment of the present invention three.
The specific embodiment
Below in conjunction with accompanying drawing, by embodiment, feature of the present invention and other correlated characteristic are described in further detail, so that technician's of the same trade understanding:
As Fig. 1-9, in figure, mark 1-9 is respectively: end bearing pile 1, Soft Soil Layer 2, hard formation 3, friction pile 4, single pile 5, stake crossbeam 6, campshed basis 7, bar shaped footing 8, semicircle footing 9.
Embodiment mono-: being used at present superstructure that the existing common problem in pile group basis of enough bearing capacities is provided is exactly that bearing capacity is less and pile body length is larger.As shown in Figure 5, in order to improve this phenomenon, the present embodiment provides a kind of U of utilization font campshed basis to improve the method for pile group bearing capacity, the campshed basis that described pile group is be arranged in parallel by many rows forms, and respectively organize campshed basis, by several single piles, rearranged, most of pile body of each single pile is arranged in the soil body, with respect to conventional campshed basis, the method of this raising pile group bearing capacity is by arranging a crossbeam 6 so that each single pile 5 in it is connected in 7 bottoms, campshed basis, make it to provide the loaded area much larger than original campshed basis, and improve whole stress-bearing capability and the stability of pile group.
As shown in Fig. 3,4,5, the U font campshed basis 7 in the present embodiment is rearranged by some single piles 5 that go deep in the soil body, and this method of utilizing U font campshed basis to improve pile group bearing capacity specifically comprises following measures:
In each adjacent single pile 5 bottoms, a crossbeam 6 is set so that interconnect between adjacent single pile 5, and is integrated pouring structure between each adjacent single pile 5 and stake crossbeam 6, finally make between each adjacent single pile 5, to form U font structure in campshed basis 7; Wherein each single pile 5 is the cylindrical pile body of vertical setting, and 6, crossbeam of stake is horizontally disposed cylindrical pile body, and the diameter of stake crossbeam 6 is identical with the diameter of single pile 5.
As shown in Fig. 3,4,5, the Specific construction step that improves the method for pile group bearing capacity for realizing the above-mentioned U of utilization font campshed basis is:
1. first on two ground, place separated by a distance, adopt the mode of mechanical hole building or manually digging hole to carry out vertical pore-forming, adjacent single pile 5 is carried out to pore-forming;
2. after, in vertical hole, transfer that cross drilling device carries out horizontal pore-forming so that be communicated with between adjacent vertical hole, stake crossbeam 6 is carried out to pore-forming;
3., after treating pile hole construction, determine as required whether below arranges the specification of reinforcing cage and reinforcing cage, last concreting pile;
4. according to above-mentioned steps 1. to step 3. described in, all the other single piles in campshed basis are adopted to same construction method, form U font campshed basis 7, and improve the supporting capacity of pile group integral body with this.
The beneficial effect that utilizes U font campshed basis to improve the method for pile group supporting capacity in the present embodiment is specially: the method is set up the stake crossbeam that connects both by the single pile bottom adjacent, not only make each single pile be linked to be whole force structure, promote pile group holistic resistant behavior, loaded area much larger than conventional pile group is provided simultaneously, its supporting capacity is promoted greatly, compare with the conventional pile group with equal supporting capacity, pile group length can shorten greatly.
Embodiment bis-: as shown in Figure 6,7, with respect to the U font campshed basis that utilizes described in embodiment mono-, improve the method for pile group bearing capacity, bar shaped footing 8 has been set up in the bottom of each single pile 5 in campshed basis in the present embodiment, further to increase loaded area on the basis on campshed basis described in embodiment mono-, and promote the resistance to capsizing of pile group.
As shown in Figure 6,7, the U font campshed basis 7 in the present embodiment is rearranged by some single piles 5 that go deep in the soil body, and this method of utilizing U font campshed basis to improve pile group bearing capacity specifically comprises following measures:
(1) in each adjacent single pile 5 bottoms, a crossbeam 6 is set so that interconnect between adjacent single pile 5, and is integrated pouring structure between each adjacent single pile 5 and stake crossbeam 6, finally make between each adjacent single pile 5, to form U font structure in campshed basis;
(2) in each single pile 5 bottoms, two the bar shaped footings 8 perpendicular with stake crossbeam 6 are all set, the both sides of these two bar shaped footings, 8 apportion stake crossbeams 6, and bar shaped footing 8 is perpendicular with the axis of single pile 5; Bar shaped footing 8 is cylindrical pile body, can be also barrette, and the length of this bar shaped footing 8 is not more than the length of single pile 5, certainly also can suitably lengthen according to soil property and requirement for bearing capacity.
As shown in Figure 6,7, for realizing the Specific construction step of the method for the above-mentioned U of utilization font campshed basis raising pile group bearing capacity, be:
1. first on two ground, place separated by a distance, adopt the mode of mechanical hole building or manually digging hole to carry out vertical pore-forming, adjacent single pile 5 carried out to pore-forming,
2. after, in vertical hole, transfer that cross drilling device carries out horizontal pore-forming so that be communicated with between adjacent vertical hole, stake crossbeam 6 is carried out to pore-forming;
3. thereafter again by this cross drilling device carrying out pore-forming with the perpendicular direction of stake crossbeam 6 holes, bar shaped footing 8 is carried out to pore-forming;
4., after treating pile hole construction, determine as required whether below arranges the specification of reinforcing cage and reinforcing cage, last concreting pile;
5. according to above-mentioned steps 1. to step 4. described in, all the other single piles in campshed basis are adopted to same construction method, form U font campshed basis 7, and improve the supporting capacity of pile group integral body with this.
The beneficial effect that utilizes U font campshed basis to improve the method for pile group supporting capacity in the present embodiment is specially:
The method is set up the stake crossbeam that connects both by the single pile bottom adjacent, not only make each single pile be linked to be whole force structure, promotes pile group holistic resistant behavior, and the loaded area much larger than conventional pile group is provided simultaneously, and its supporting capacity is promoted greatly;
In addition by set up the loaded area that bar shaped footing has further increased campshed basis in the bottom of single pile, and by means of the interaction force between bar shaped footing and the soil body, can effectively promote its resistance to capsizing;
This pile group is compared with the conventional campshed basis with equal bearing value, and single pile length can shorten greatly.
Embodiment tri-: as shown in Figure 8,9, with respect to the U font campshed basis that utilizes described in embodiment mono-, improve the method for pile group bearing capacity, semicircle footing 9 has been set up on campshed basis in the present embodiment in the bottom of each single pile 5, further to increase loaded area on the basis on campshed basis described in embodiment mono-, and promote the resistance to capsizing of pile group integral body.
As shown in Figure 8,9, the U font campshed basis 7 in the present embodiment is rearranged by some single piles 5 that go deep in the soil body, and this method of utilizing U font campshed basis to improve pile group bearing capacity specifically comprises following measures:
(1) in each adjacent single pile 5 bottoms, a crossbeam 6 is set so that interconnect between adjacent single pile 5, and is integrated pouring structure between each adjacent single pile 5 and stake crossbeam 6, finally make between each adjacent single pile 5, to form U font structure in campshed basis;
(2) widen semicircle footing 9, the both sides of these two semicircle footing 9 apportion stake crossbeams 6 for level is set in each single pile 5 bottoms two; Semicircle footing 9 is structure as a whole with single pile 5, its semicircular radius is not more than the length of single pile 5, certainly its radius also can suitably lengthen according to soil property and requirement for bearing capacity, obviously, the semicircle footing 9 in the present embodiment provides pressure-bearing cross section and the stability against overturning energy than bar shaped footing is larger in embodiment bis-.
As shown in Figure 8,9, for realizing the Specific construction step of the method for the above-mentioned U of utilization font campshed basis raising pile group bearing capacity, be:
1. first on two ground, place separated by a distance, adopt the mode of mechanical hole building or manually digging hole to carry out vertical pore-forming, adjacent single pile 5 is carried out to pore-forming;
2. after, in vertical hole, transfer that cross drilling device carries out horizontal pore-forming so that be communicated with between adjacent vertical hole, stake crossbeam 6 is carried out to pore-forming;
3. by this cross drilling device, form semicircle intervally swinging reaming with the perpendicular direction of stake crossbeam 6 holes more thereafter, semicircle footing 9 is carried out to pore-forming;
4., after treating pile hole construction, determine as required whether below arranges the specification of reinforcing cage and reinforcing cage, last concreting pile;
5. according to above-mentioned steps 1. to step 4. described in, all the other single piles in campshed basis are adopted to same construction method, form U font campshed basis 7, and improve the supporting capacity of pile group integral body with this.
It should be noted that, the semicircle footing 9 in the present embodiment is not limited to be the semicircle of 180 °, also comprises the fan shape that is 180 ° of less thaies.
The beneficial effect that utilizes U font campshed basis to improve the method for pile group supporting capacity in the present embodiment is specially:
Should set up the stake crossbeam that connects both by the single pile bottom adjacent, and not only make each single pile be linked to be whole force structure, promote pile group holistic resistant behavior, the loaded area much larger than conventional pile group was provided simultaneously, its supporting capacity is promoted greatly;
In addition by set up semicircle footing 9 in the bottom of single pile 5, further increase the pressure-bearing cross section on campshed basis, and by means of the interaction force between semicircle footing 9 and the soil body, can effectively promote resistance to capsizing and the stability of pile group integral body;
This pile group is compared with the conventional pile group with equal supporting capacity, and pile group length can shorten greatly.
Claims (5)
1. one kind is utilized the basic method that improves pile group bearing capacity of U font campshed, described pile group forms by arranging described campshed basis more, described campshed basis is rearranged by some single piles, it is characterized in that described method comprises the following steps: between each adjacent described single pile bottom, to connect a crossbeam is set in described campshed basis, to increase the bottom loaded area on described campshed basis, described stake crossbeam and described single pile are structure as a whole.
2. a kind of method of utilizing U font campshed basis to improve pile group bearing capacity according to claim 1, is characterized in that, in described single pile bottom, footing is set, and makes described footing and described single pile axis perpendicular.
3. a kind of method of utilizing U font campshed basis to improve pile group bearing capacity according to claim 2, is characterized in that making the length of described footing to be not more than as described single pile length.
4. a kind of method of utilizing U font campshed basis to improve pile group bearing capacity according to claim 2, is characterized in that making described footing to be strip, and centered by described single pile axis, is symmetrical arranged.
5. a kind of method of utilizing U font campshed basis to improve pile group bearing capacity according to claim 2, is characterized in that making described footing to be semicircle shape, and centered by described single pile axis, is symmetrical arranged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310742529.6A CN103669386B (en) | 2013-12-30 | 2013-12-30 | Utilize the method that pile group bearing capacity is improved on U-shaped campshed basis |
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| CN201310742529.6A CN103669386B (en) | 2013-12-30 | 2013-12-30 | Utilize the method that pile group bearing capacity is improved on U-shaped campshed basis |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114376A (en) * | 1994-09-07 | 1996-01-03 | 张国梁 | Underground continuous wall and construction method thereof |
| CN1441124A (en) * | 2003-04-18 | 2003-09-10 | 雷玉华 | High-pressure rotary spraying and core inserting process to form pedestal pile |
| CN1519436A (en) * | 2003-01-22 | 2004-08-11 | 敏 黄 | Grouting base slab burdening pile with its pile tip and design method |
| CN202007413U (en) * | 2011-03-30 | 2011-10-12 | 四川省电力公司眉山公司 | Cross-based electric pile |
| WO2011155619A1 (en) * | 2010-06-07 | 2011-12-15 | Ｊｆｅスチール株式会社 | Foundation pile group |
| CN102493475A (en) * | 2011-12-06 | 2012-06-13 | 牛伟民 | Lattice pile foundation and construction method thereof |
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2013
- 2013-12-30 CN CN201310742529.6A patent/CN103669386B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114376A (en) * | 1994-09-07 | 1996-01-03 | 张国梁 | Underground continuous wall and construction method thereof |
| CN1519436A (en) * | 2003-01-22 | 2004-08-11 | 敏 黄 | Grouting base slab burdening pile with its pile tip and design method |
| CN1441124A (en) * | 2003-04-18 | 2003-09-10 | 雷玉华 | High-pressure rotary spraying and core inserting process to form pedestal pile |
| WO2011155619A1 (en) * | 2010-06-07 | 2011-12-15 | Ｊｆｅスチール株式会社 | Foundation pile group |
| CN202007413U (en) * | 2011-03-30 | 2011-10-12 | 四川省电力公司眉山公司 | Cross-based electric pile |
| CN102493475A (en) * | 2011-12-06 | 2012-06-13 | 牛伟民 | Lattice pile foundation and construction method thereof |
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