CN202899121U - Cohesive force reinforcing type rigid material and flexible material composite pile - Google Patents
Cohesive force reinforcing type rigid material and flexible material composite pile Download PDFInfo
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- CN202899121U CN202899121U CN 201220144784 CN201220144784U CN202899121U CN 202899121 U CN202899121 U CN 202899121U CN 201220144784 CN201220144784 CN 201220144784 CN 201220144784 U CN201220144784 U CN 201220144784U CN 202899121 U CN202899121 U CN 202899121U
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Abstract
The utility model relates to a cohesive force reinforcing type rigid material and flexible material composite pile which comprises a cement stirring pile body (4) and a concrete immersed tube filling pile stiffness core (5), wherein the cement stirring pile body (4) and the concrete immersed tube filling pile stiffness core (5) are arranged in a concentric mode, the top of the cement stirring pile body (4) and the top of the concrete immersed tube filling pile stiffness core (5) are located on the same horizontal plane and provided with a cast-in-situ reinforced concrete cover plate (1), the concrete immersed tube filling pile stiffness core (5) is longer than the cement stirring pile body (4), and a precast pile tip (7) is arranged under the concrete immersed tube filling pile stiffness core (5). More than one expanded and squeezed concrete branch (6) is arranged on the portion, where the concrete immersed tube filling pile stiffness core (5) coincides with the cement stirring pile body (4), of the concrete immersed tube filling pile stiffness core (5). A branch expanding and squeezing device inside each steel immersed tube (12) is expanded and squeezed and then filled with concrete to form the expanded and squeezed concrete branch (6). The cohesive force reinforcing type rigid material and flexible material composite pile can effectively solve the problems that the upper portion of a pile body of an existing immersed tube filling pile is prone to breakage, and the like; and can effectively avoid the problems that the connection strength of the cover plate and the pile is low, the concentricity deviation is large, a pile cap can be separated from the pile due to construction machinery, and the like.
Description
Technical field
The utility model relates to the hard and soft compound pile of a kind of adhesion stress enhanced, be particularly related to and a kind ofly expand squeeze a tray concrete filling pile concentric sets by cement mixing pile and band and close the hard and soft compound pile of adhesion stress enhanced that forms, can be used for the medium deep soft soil treatments of engineering such as highway, municipal administration, airport and dykes and dams.
Background technology
China is vast in territory, and complex geologic conditions and various places difference are larger, and the soft foundation classification is many, distribution is wide; Particularly in the coastal area and sedimentary facies area, interior Di Hu river exist the medium deep soft soil foundation of numerous complicated.
A large amount of exploitations of China's pile foundation technology start from the eighties in 20th century, and pile foundation changes the characteristics such as strong adaptability and obtains increasingly extensive application with its bearing capacity height, good stability, with the geology condition.Tube-sinking cast-in-situ pile claims again the casing pipe hole forming castinplace pile, can be divided into vibrator pipe sinking cast-in-place pile, hammer hidden pipe caisson pile and vibratory impulse tube-sinking cast-in-situ pile by its hole forming method difference.The advantages such as tube-sinking cast-in-situ pile is simple with its construction equipment, easy construction, cost is low, speed of application is fast, the duration is short are widely used in China; The older generations of China's geotechnical engineering circle have carried out unremitting effort and exploration to the design of tube-sinking cast-in-situ pile, construction, detection etc., have also obtained significant progress since introducing China.Because tube-sinking cast-in-situ pile is Squeezing Soil Pile, being subjected to soil compaction effect and top construction machinery to roll load in practical engineering application affects and is prone to broken pile, have a strong impact on the load-carrying properties of tube-sinking cast-in-situ pile, and from present engineering experience, the broken pile position mostly is and is positioned at pile body top.At present in the practical engineering application, the rigid pile stake arranges square or circular cover at most, the setting of cover plate can effectively reduce the pulling force of bed course reinforcement material, improves the stress performance of reinforcement cushion, simultaneously capable of regulating stake soil load share ratio, coordinate pile soil common action, the stress that reduces an end face concentrates.Cover plate is normal to be adopted cast-in-place and prefabricated two kinds, at present stake is hanged down with the cover plate bonding strength and the large grade of concentricity deviation is FAQs, sheet pile with cover paves and rolls in the process at first floor soil in embankment, dam construction, the eccentric compression of construction machinery easily causes cover plate and stake to break away from, cause the cover plate pile capacity obviously to reduce, the cover plate effect also obviously reduces.
Cement mixing pile is on the spot weak soil and cement to be forced to mix and stir at earth formation deep by special deep-layer stirring machinery, makes the weak soil scleroma and the raising foundation strength.Cement mixing pile can be divided into two kinds of wet method and dry method by the injection of material state, and wet method stirs take cement paste as main, is easy to stir again, and the cement-soil firm time is longer; Wet method is used more popular at present under suitable condition.Require the characteristics such as lower, that construction technology is ripe, cost is relatively low because cement mixing pile has the construction plant, be widely applied in China.But the processing depth as shallow of cement mixing pile adopts domestic it is generally acknowledged of common construction equipment to be only applicable to process the degree of depth less than the soft base of 10～12m.The two-way cement mixing pile that grew up in recent years, by positive and negative friction speed rotating vane while two-way stirring, and reverse agitating function faster when the blade of upper strata, emit approach on the blocking-up slurries, cement grout is stirred fully with the soil body on the spot, guaranteed pile quality, particularly the deep layer pile quality.Though two-way cement mixing pile than the ordinary Portland cement agitation pile, increases aspect pile quality, it is amid a sharp increase to process the degree of depth, is difficult to be applied to medium deep soft soil treatment.Two-way cement mixing pile is by the setting of fixed blade and extensible blade, and by forward and reverse rotation, the mode according to designing requirement formation nail type stake or local diameter expansion pile body is verified in engineering practice in ground.
The engineering of at present steady-state deformation being had relatively high expectations often adopts rigid pile, hard and soft compound pile, length stake etc. to process deep soft foundation; Hard and soft compound pile is a kind of Soft Soil Subgrade Treatment Techniques of flexible pile (cement mixing pile, high-pressure rotary jet grouting pile etc.) interpolation rigid pile (plain concrete pile, pile for prestressed pipe, CFG stake etc.).The reinforcement mechanism of hard and soft compound pile is to have set the larger rigid pile of the concentric intubating length of flexible pile, forms hard and soft compound pile.Utilize side surface area and the cross-sectional area on the flexible pile increasing pile body top that construction depth is more shallow, diameter is larger to increase pile side friction and obtain the bearing capacity that larger replacement ratio improves single pile and composite foundation.Rigid pile is passed to preferably bearing stratum of bottom intensity with fractional load, sedimentation and the relative settlement of control composite foundation, overcome flexible pile and processed the difficult problem that the degree of depth is limited, the pile body lower mass is difficult to ensure, effectively saved the quantity that sets of rigid pile simultaneously, reduced construction costs.At present, hard and soft compound pile technology has obtained using more and more widely in the treatment of soft foundation engineerings such as speedway, high-speed railway, municipal administration, airport, dykes and dams with its superior load-carrying properties, cost performance height and the larger advantages such as range of application.
The hard and soft compound pile that adopts in the engineering at present because rigid pile and flexible pile contact surface shear strength deficiency, causes under some geological conditions flexible pile and rigid pile when bearing larger load
Shear failure easily occurs in contact surface, and this moment, pile side friction and end resistance were brought into play not yet fully.Have at present the mode of rigid pile being arranged to taper, improve the collaborative load-carrying properties of rigid pile and flexible pile, improve the technology of its bearing capacity, but in being provided with the hard and soft compound pile of conical rigid stake, some cross section flexible pile will be born larger pressure, easily cause flexible pile to destroy too early the destruction that closely causes whole hard and soft combination pile body because of strength deficiency.
Total the above, according to present actual conditions and technical condition, need badly invention a kind of between duration, construction investment, workmanship reasonable balance, effectively overcome the problems such as tube-sinking cast-in-situ pile pile concrete pouring quality poor and the poor and easy disengaging of the easy broken pile in top, cover plate and rigid pile bonding strength, rigid pile and flexible pile contact surface shear strength be low, give full play to the characteristics of flexible pile and rigidity shape, it is used in combination the hard and soft compound pile of adhesion stress enhanced and the job practices of reinforcing medium deep soft foundation.
The utility model content
The purpose of this utility model is to provide a kind of adhesion stress enhanced hard and soft compound pile, with concrete pipe sinking cast-in-place pile and cement mixing pile applied in any combination, gives full play to the advantage of two kinds of stake types.Overcome the problems such as tube-sinking cast-in-situ pile pile concrete pouring quality poor and the poor and easy disengaging of the easy broken pile in top, cover plate and rigid pile bonding strength, rigid pile and flexible pile contact surface shear strength be low.
In order to realize above-mentioned purpose, the utility model has adopted following technical scheme:
The hard and soft compound pile of a kind of adhesion stress enhanced is characterized in that comprising cement mixing pile pile body and the concrete pipe sinking cast-in-place pile strength core that arranges with one heart, and both tops are provided with the cast-in-situ steel reinforced concrete cover plate; The length of concrete pipe sinking cast-in-place pile strength core is greater than the cement mixing pile pile body, and the bottom at concrete pipe sinking cast-in-place pile strength core arranges precast pile tip, and the position that overlaps with the cement mixing pile pile body on concrete pipe sinking cast-in-place pile strength core arranges to expand more than one squeezes the concrete branch; Expanding crowded concrete branch is to be poured into and formed by the crowded rear concrete of branch extruding-spreading device expansion that is arranged in the tube-sinking cast-in-situ pile steel immersed tube.Expand the setting of squeezing the concrete branch, effectively avoided the problems such as rigid pile and flexible pile contact surface shear strength are low, improved the collaborative load-carrying properties of hard and soft compound pile.
The hard and soft compound pile of aforesaid adhesion stress enhanced, it is characterized in that the branch extruding-spreading device comprises dynamical system, power transmission shaft, blade, small-sized vibrating spear, blade is comprised of fixed blade and extensible blade, fixed blade is fixed on the power transmission shaft, and extensible blade pass is crossed the other end that universal driving shaft is connected to fixed blade; The interior outside of fixed blade all has cutting edge, and extensible blade semicircular in shape and inboard have cutting edge, and extensible blade was closed when power transmission shaft was rotated in the forward, and extensible blade is stretched out during the power transmission shaft reverse rotation; Small-sized vibrating spear is connected to the bottom of power transmission shaft, and vibrating bar hose is drawn by power transmission shaft inside.
The hard and soft compound pile of aforesaid adhesion stress enhanced is characterized in that concrete pipe sinking cast-in-place pile strength core and cast-in-situ steel reinforced concrete cover plate are once constructed to finish; Concrete pipe sinking cast-in-place pile strength core stake tip cutting is established the cover plate connecting reinforcement.The cover plate setting can effectively avoid flexible pile stake top crushed, the perfusion of cover plate and concrete pipe sinking arranges connecting reinforcement and one-time-concreting is finished and the major diameter cement mixing pile effective contact area that has increased at the bottom of the cover plate with stake is set, can effectively overcome the problems such as the poor and easy disengaging of cover plate and rigid pile bonding strength.
The hard and soft compound pile of aforesaid adhesion stress enhanced is characterized in that the cement mixing pile pile body is for adopting two to stir the two-way cement mixing pile of wet method that two pressure spray process are made.
The hard and soft compound pile of aforesaid adhesion stress enhanced is characterized in that precast pile tip adopts steel plate pile top or precast reinforced concrete piles point.
Characteristics of the present utility model are effectively to have overcome the problem such as tube-sinking cast-in-situ pile pile concrete pouring quality poor and the poor and easy disengaging of the easy broken pile in top, cover plate and rigid pile bonding strength, rigid pile and flexible pile contact surface shear strength be low, with concrete pipe sinking cast-in-place pile and cement mixing pile applied in any combination, given full play to the advantage of two kinds of stake types.
Description of drawings
Fig. 1 is the hard and soft compound pile generalized section of the utility model adhesion stress enhanced;
Fig. 2 is that the utility model branch expands crowded blading schematic diagram;
Fig. 3 is the hard and soft compound pile construction technology of the utility model adhesion stress enhanced schematic diagram;
Among the figure: 1-cast-in-situ steel reinforced concrete cover plate, 2-cover plate arrangement of reinforcement, 3-connecting reinforcement, 4-cement mixing pile pile body, 5-concrete pipe sinking cast-in-place pile strength core, 6-concrete expand crowded branch, 7-precast pile tip, 8-power transmission shaft, 9-fixed blade, the extensible blade of 10-, the small-sized vibrating spear of 11-, 12-steel immersed tube.
Specific embodiment
Fig. 1 is the hard and soft compound pile generalized section of the utility model adhesion stress enhanced, with reference to shown in Figure 1, the hard and soft compound pile of a kind of adhesion stress enhanced, comprise cement mixing pile pile body 4 and the concrete pipe sinking cast-in-place pile strength core 5 that arranges with one heart, both tops are positioned at same level and are provided with cast-in-situ steel reinforced concrete cover plate 1; The length of concrete pipe sinking cast-in-place pile strength core 5 is greater than cement mixing pile pile body 4, and the bottom at concrete pipe sinking cast-in-place pile strength core 5 arranges precast pile tip 7, arranges 1 with the compound position of cement mixing pile pile body 4 every 2m and expand and squeeze concrete branch 6 on concrete pipe sinking cast-in-place pile strength core 5.
Cast-in-situ steel reinforced concrete cover plate 1, diameter is 1.2m, and outward appearance is rounded, and thickness is 0.3m, by C25 concreting.Arrange arrangement of reinforcement 2 in the concrete cover, cover plate and pile body 4 are reinforced by connecting reinforcement 3.It is the indented bars of 12mm that connecting reinforcement 3 adopts diameter, evenly arranges 4, and inserting the stake top degree of depth is 0.5m.Concrete pipe sinking cast-in-place pile 5 is once constructed with cast-in-situ steel reinforced concrete cover plate 1 and is finished.
Cement mixing pile pile body 4, selecting diameter is the two-way cement mixing pile of wet method of 0.9m, the long 10m of stake, cement adopts No. 32.5 Portland cements, and water/binder ratio adopts 0.55, and the cement mixing content of agitation pile is 180kg/m, adopts two to stir two pressure spray process.
Concrete pipe sinking cast-in-place pile strength core 5, adopting diameter is the concrete pipe sinking cast-in-place pile of 377mm, the long 18m of stake.It is that 377mm, wall thickness are the seamless steel pipe of 10mm that steel immersed tube 12 adopts diameter; Concrete adopts C25, and match ratio should determine that the rubble coarse aggregate size is preferably 20～40mm by test, and fines should adopt clean medium coarse sand, determines slump value according to Soft Soil Parameters, need possess good flowability and workability.
Precast pile tip 7, adopting wall thickness is the circular steel plate pile tip of 12mm, diameter is 0.4m.
Expand and squeeze concrete branch 6, cross section presents ellipse, and vertical maximum ga(u)ge is 0.1m, and lateral length is 0.1m.To pour into and form by the crowded rear concrete of branch extruding-spreading device expansion that is arranged in the tube-sinking cast-in-situ pile 5 steel immersed tube 12.But the branch extruding-spreading device is comprised of dynamical system, power transmission shaft 8, blade, the small-sized vibrating spear 11 of positive and negative rotation, and place steel immersed tube 12 inside, Fig. 2 is that the utility model branch expands crowded blading schematic diagram, with reference to shown in Figure 2, blade is comprised of fixed blade 9 and extensible blade 10, fixed blade 9 is fixed with power transmission shaft, extensible blade 10 is connected to the other end of fixed blade 9, extensible blade 10 closures when power transmission shaft is rotated in the forward, extensible blade 10 is stretched out during the power transmission shaft reverse rotation, and water squeezing earth is expanded in cutting.
It is that 80mm, wall thickness are the seamless steel pipe of 8mm that power transmission shaft 8 adopts external diameters, and fixed blade 9 is welded on the power transmission shaft 8, and employing thickness is that 12mm, width are that 60mm, length are that the steel plate of 120mm is made, and the steel plate both sides have cutting edge; Extensible blade 10 semicirculars in shape, employing thickness are that 12mm, width are that steel plate, the inboard of 60mm has cutting edge, and semicircular diameter is 120mm.Fixed blade 9 be connected blade 10 and connect by universal driving shaft, connect extensible blade 10 closures when being convenient to power transmission shaft and being rotated in the forward, extensible blade 10 is stretched out during the power transmission shaft reverse rotation, can place steel immersed tube 12 inside after extensible blade 10 closures.
It is the motor in head vibrator of 25mm that the bottom connecting small-sized vibrating spear 11 of power transmission shaft 8, small-sized vibrating spear 11 can adopt the caput diameter, and vibrating bar hose is drawn by power transmission shaft 8 inside.
Fig. 3 is the hard and soft compound pile construction technology of the utility model adhesion stress enhanced schematic diagram, and with reference to shown in Figure 3, the job practices of the hard and soft compound pile of adhesion stress enhanced may further comprise the steps:
(1) at first carries out cement mixing pile 4 constructions according to designing pile length;
(2) after cement mixing pile 4 construction is finished, carry out immediately concrete pipe sinking cast-in-place pile 5 constructions, steel immersed tube 12 bottoms are by precast pile tip 11 sealings, and the auxiliary vibration of static pressure sets absolute altitude at the bottom of 5 of the concrete piles in cement-soil;
(3) to steel immersed tube 12 interior penetration concretes, promote pipe in the vibration, start small-sized vibrating spear 11 and vibrate;
(4) tube drawing squeezes concrete branch 6 positions to expanding, and makes immersed tube 12 bottoms squeeze blading a little more than expanding, and start to expand and squeeze device, reverse rotation, extensible blade 10 is stretched out, and water squeezing earth is expanded in cutting, and concrete pours into to form to expand and squeezes concrete branch 6;
(5) start expansion and squeeze device, be rotated in the forward, will stretch blade 10 closures, promote pipe in the continuation, in steel immersed tube 12, add concrete as required, to next branch design attitude, repeating step (4) is finished concrete pipe sinking cast-in-place pile 5 and is expanded crowded concrete branch 6 constructions.
(6) plug cover plate connecting reinforcement 3 at cast-in-place concrete pile 5 tops, cover plate formwork for placing and cover plate arrangement of reinforcement 2 are installed, build and form reinforced concrete cover plate 1.
Claims (5)
1. the hard and soft compound pile of adhesion stress enhanced is characterized in that comprising cement mixing pile pile body (4) and the concrete pipe sinking cast-in-place pile strength core (5) that arranges with one heart, and both tops are positioned at same level and are provided with cast-in-situ steel reinforced concrete cover plate (1); The length of concrete pipe sinking cast-in-place pile strength core (5) is greater than cement mixing pile pile body (4), and in the bottom of concrete pipe sinking cast-in-place pile strength core (5) precast pile tip (7) is set, arranges to expand more than one at the upper position that overlaps with cement mixing pile pile body (4) of concrete pipe sinking cast-in-place pile strength core (5) and squeeze concrete branch (6).
2. the hard and soft compound pile of adhesion stress enhanced according to claim 1, it is characterized in that the branch extruding-spreading device comprises dynamical system, power transmission shaft (8), blade, small-sized vibrating spear (11), blade is comprised of fixed blade (9) and extensible blade (10), fixed blade (9) is fixed on the power transmission shaft (8), and extensible blade (10) is connected to the other end of fixed blade (9) by universal driving shaft; The interior outside of fixed blade (9) all has cutting edge, and extensible blade (10) semicircular in shape and inboard have cutting edge, extensible blade (10) closure when power transmission shaft is rotated in the forward, and extensible blade (10) is stretched out during the power transmission shaft reverse rotation; Small-sized vibrating spear (11) is connected to the bottom of power transmission shaft 8, and vibrating bar hose is drawn by power transmission shaft (8) inside.
3. the hard and soft compound pile of adhesion stress enhanced according to claim 1 is characterized in that concrete pipe sinking cast-in-place pile strength core (5) and cast-in-situ steel reinforced concrete cover plate (1) are once constructed to finish; Concrete pipe sinking cast-in-place pile strength core (5) stake tip cutting is established cover plate connecting reinforcement (3).
4. the hard and soft compound pile of adhesion stress enhanced according to claim 1 is characterized in that cement mixing pile pile body (4) is for adopting two to stir the two-way cement mixing pile of wet method that two pressure spray process are made.
5. the hard and soft compound pile of adhesion stress enhanced according to claim 1 is characterized in that precast pile tip (7) adopts steel plate pile top or precast reinforced concrete piles point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220144784 CN202899121U (en) | 2012-04-09 | 2012-04-09 | Cohesive force reinforcing type rigid material and flexible material composite pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220144784 CN202899121U (en) | 2012-04-09 | 2012-04-09 | Cohesive force reinforcing type rigid material and flexible material composite pile |
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| Publication Number | Publication Date |
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| CN202899121U true CN202899121U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220144784 Expired - Fee Related CN202899121U (en) | 2012-04-09 | 2012-04-09 | Cohesive force reinforcing type rigid material and flexible material composite pile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343111A (en) * | 2014-09-28 | 2015-02-11 | 山东科技大学 | Composite foundation for reinforcing thick sand soil layer by using node piles |
| CN105421449A (en) * | 2015-11-18 | 2016-03-23 | 杭州江润科技有限公司 | Construction method of composite pile composed of nail-shaped active material plastic sleeve and concrete stiffened core |
| CN105484279A (en) * | 2016-01-28 | 2016-04-13 | 杭州江润科技有限公司 | Drainage cast-in-situ concrete thin-wall pipe pile construction method |
-
2012
- 2012-04-09 CN CN 201220144784 patent/CN202899121U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343111A (en) * | 2014-09-28 | 2015-02-11 | 山东科技大学 | Composite foundation for reinforcing thick sand soil layer by using node piles |
| CN105421449A (en) * | 2015-11-18 | 2016-03-23 | 杭州江润科技有限公司 | Construction method of composite pile composed of nail-shaped active material plastic sleeve and concrete stiffened core |
| CN105421449B (en) * | 2015-11-18 | 2017-04-26 | 杭州江润科技有限公司 | Construction method of composite pile composed of nail-shaped active material plastic sleeve and concrete stiffened core |
| CN105484279A (en) * | 2016-01-28 | 2016-04-13 | 杭州江润科技有限公司 | Drainage cast-in-situ concrete thin-wall pipe pile construction method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20180409 |