CN103485334B - Bi-layer plastic-bushing inverted-arch cambered hollow special-shaped pile and construction method - Google Patents
Bi-layer plastic-bushing inverted-arch cambered hollow special-shaped pile and construction method Download PDFInfo
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- CN103485334B CN103485334B CN201310426114.8A CN201310426114A CN103485334B CN 103485334 B CN103485334 B CN 103485334B CN 201310426114 A CN201310426114 A CN 201310426114A CN 103485334 B CN103485334 B CN 103485334B
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- 239000004033 plastic Substances 0.000 claims description 91
- 229920003023 plastic Polymers 0.000 claims description 91
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Abstract
The invention relates to a bi-layer plastic-bushing inverted-arch cambered hollow special-shaped pile and a construction method. The pile is characterized by structurally comprising the inverted-arch cambered hollow special-shaped pile, a pile toe arranged at the bottom end of the special-shaped pile and fixed through fixing parts, and a precast reinforced concrete pile tip; a cemented soil layer is arranged on the outer side of a pile body; a cross section of the special-shaped pile is Y-shaped or X-shaped, and bushings with threads are arranged in a round hole in the center of the pile body and on the outer side of the pile body; a reinforcement cage, which is in the same shape as the pile body but slightly smaller than the pile body, is arranged in the pile body; horizontal and longitudinal tensile reinforcements are arranged in the reinforcement cage; and the fixing parts corresponding to the bushings and an immersed tube are arranged on the top face of the precast reinforced concrete pile tip. During construction, the pile toe and the inner bushing are fixed firstly, then the reinforcement cage and the outer bushing are sleeved, and concrete is poured between the inner bushing and the outer bushing as well as between the outer bushing and the immersed tube to respectively form a concrete pile core and a pile-side cemented soil layer. Area of the cross section of the pile body is small, consumption of building materials is reduced, bearing capacity is high, and the pile body is high in capability of resisting to environmental erosion.
Description
Technical field
The present invention relates to a kind of Novel pile body structure and construction method, be the antiarch curve hollow shaped pile that Y shape or X-shaped, pile body center and outside are provided with the double-layer plastic sleeve pipe establishing deformed bar cage in threaded plastic bushing, pile body in particular to a kind of pile body cross section, belong to foundation engineering field, be applicable to the basement process in the engineerings such as building construction, highway, municipal administration, airport, dykes and dams.
Background technology
Along with the development of China's modernization, the scale of infrastructure and the load of building increasing, also more and more higher to the requirement of ground.The object of basement process is by a series of engineering measure, technical measures, structural measure, increases the strength and stability of ground, reduces foundation deformation.At present, common method for processing foundation comprises complex ground treatment method, consolidation, cushion, dynamic compaction etc., and various processing method all has the corresponding scope of application and pluses and minuses.
Consider that composite foundation has the advantages such as consolidation effect is good, the duration is short, settlement after construction is little, be widely applied in Base Consolidation Engineering, conventional composite foundation reinforcing method has tube-sinking cast-in-situ pile, precast square pile, pile for prestressed pipe, plastic sleeve concrete pile etc., and the transverse shape of pile body is generally circular or square.In above-mentioned treatment process of composite foundation, pile tube applies comparatively general one, is often divided into pile for prestressed pipe and non-prestressed pile tube two class, and it has, and bearing capacity of single pile energy is high, applied widely, pile quality reliable, save the advantages such as constructional materials.But because the pile body sectional area of pile tube is less, the ability that opposing lateral deformation and external environment corrode is poor.Tube-sinking cast-in-situ pile utilizes sinking apparatus, steel pipe with steel concrete shoe (valve type pile shoe) is sunk in soil, form stake holes, then cage of reinforcement is put into and concreting, extract sleeve pipe thereupon, utilize vibration during tube drawing by concrete tamping, just form required castinplace pile.Tube-sinking cast-in-situ pile avoids the pile body sinking that general bored pile pile top surface dust causes, and holds hypodynamic problem, and also effectively improve pile body surface laitance phenomenon, in addition, this technique also more saves material simultaneously.But construction quality is wayward, tube drawing is too fast easily causes stake shortea, and owing to being Squeezing Soil Pile, the stake of pouring into a mould in advance is vulnerable to soil compaction effect and produces inclined fracture even misplace.
Shaped pile is also progressively applied in engineering in recent years, as Y shape stake, X-shaped stake, H-shaped stake etc., wherein antiarch curved surface Y, X-shaped stake are widely used shaped pile in current engineering, two kinds of pile-type are the innovative techniques with China's independent intellectual property right, Y, X-shaped stake stake week have cambered inwards curved surface, may be defined as antiarch curved surface, typical circular stake has cambered outwards curved surface, may be defined as right arch curved surface.The traditional idea of Y, its common trait of X-shaped stake for a change stake " not rounded i.e. side ", there is cambered inwards antiarch curved surface, principle is expanded according to uniform section special-shaped periphery, derive from the circular stake of tradition, as Y shape stake and conventional diameter 377mm with compared with the circular stake of area, girth is its 1.46 times, can adopt prefabricated pile or common tube-sinking cast-in-situ pile device context cast pile.Though this shaped pile has good mechanical characteristic, because pile lining its corrosion resistance thinner is poor, stake side shear strength is on the low side.The more difficult control of construction quality of existing shaped pile, the uniformity being mainly reflected in pile is inadequate, pile breaking phenomenon is outstanding.
Have the Novel pile body structure establishing plastic bushing outside pile body at present, as plastic sleeve concrete pile, be made up of prefabricated water proof pile top, screw plastic casing, concrete, pile cover (cover plate) etc., also relative engineering effort is preferably achieved under suitable engineering background with geological conditions, but its pile body cross section is circular, and the double-layer plastic sleeve pipe antiarch curve hollow shaped pile applied for this exists larger difference in work progress, connected mode, stress performance etc.
In sum, although existing each method for processing foundation achieves good consolidation effect and economic benefit under suitable engineering specifications, some pile-type resist external environment corrode, resist lateral deformation, improve stock utilization, improve pile body stress performance etc. in remain certain shortcoming.Given this, according to current actual conditions and technical condition, need a kind of antiseptic property of invention is good, supporting capacity is high, constructional materials is low-consuming Novel pile body structure and construction method at present badly, to meet the needs of Base Consolidation Engineering.
Summary of the invention
The object of the present invention is to provide that a kind of stress performance is good, supporting capacity is high, decay resistance is strong, and double-layer plastic sleeve pipe antiarch curve hollow shaped pile structure and the construction method of constructional materials can be saved, to enrich method for processing foundation, to improve ground stabilization quality.
In order to realize above-mentioned technical purpose, present invention employs following technical scheme:
A kind of double-layer plastic sleeve pipe antiarch curve hollow shaped pile, is characterized in that comprising antiarch curve hollow shaped pile and precast reinforced concrete pile point; Y-shaped or the X-shaped in the cross section of antiarch curve hollow shaped pile, the circular hole of connectivity is established at pile body center vertically, is respectively equipped with threaded sleeve pipe outside pile body center and pile body;
Establish in pile body with pile body similar shape but the reinforcing cage of 100 ~ 200mm less of pile body, horizontal tension rib is set in reinforcing cage;
Conically, establish the fixture corresponding with the profile of sleeve pipe, reinforcing cage, immersed tube, size at the end face of precast reinforced concrete pile point, this fixture is specially convex falcon, tube connector or groove in the bottom of precast reinforced concrete pile point.
Described internal and external casing is threaded plastic bushing, the Y-shaped or X-shaped of outer side sleeve, and inside sleeve is rounded, and each joint sleeve pipe is fixedly connected with adopting the mode of adhesive or riveted joint between casing joint.Described internal and external casing is single wall screw pvc pipe, PE pipe or HDPE pipe.
Between the adjacent stirrup of described precast reinforced cage, horizontal tension rib is set, by colligation or be welded to connect between this horizontal tension rib and stirrup, vertical applied force reinforcing bar, and the middle part of stirrup is fixed in one end of horizontal tension rib, the other end and contiguous stirrup is vertical fixes.
Concrete perfusion in cavity between the threaded plastic bushing of inner circular and outside special-shaped casing tube, forms concrete pile core that is Y-shaped or X-shaped; Grouting Pipe spacing ring being set inside immersed tube, by being evenly pressed into cement paste in the cavity of Grouting Pipe laterally between sleeve pipe and immersed tube after concrete pile core has filled, forming stake side cement soil layer.
A construction method for double-layer plastic sleeve pipe antiarch curve hollow shaped pile, comprises the following steps:
Step one, smooth location, laying depth is sand cushion, the hardcore bed of 200mm ~ 300mm or slag blanket of gently delaying;
Step 2, precast reinforced concrete pile point, pile top end face diameter compared with the large 150mm ~ 250mm of outside immersed tube, and arranges at its end face and is used for the cover pipe connected pipe that is connected with double-layer plastic sleeve pipe and convex falcon, surveys with pile body the groove that immersed tube is connected outward;
Step 3, inner and outer tubes with casing joint respectively spreading bilayer sleeve, make sleeve pipe total length exceed designing pile length 200mm ~ 300mm;
Step 4, first the convex falcon of threaded for the inner circular at pile body center plastic bushing and precast pile tip and casing joint are connected seal, and use PVC adhesive cementation, again precast reinforced cage is placed on the outside of pile body center inside circular strip screw plastic casing, finally be socketed outer side sleeve, and outer side sleeve be connected with the tube connector of precast pile tip and seal;
Sleeve pipe with pile top stretches in the steel pipe immersed tube of outside from the bottom of outside steel pipe immersed tube by step 5, first employing lifting rope, then is inserted in immersed tube spacing ring by grouting behind shaft or drift lining pipe, is finally connected with precast pile tip closely by immersed tube;
Step 6, the immersed tube, pile body central circular sleeve pipe, outer side sleeve, the Grouting Pipe that adopt stake pile driver will to connect with precast pile tip, evenly squeeze in ground together with reinforcing cage;
Step 7, lifting immersed tube, stay in foundation soil body by pile body central circular sleeve pipe, reinforcing cage, outer side sleeve;
Step 8, pile driver is moved to next position;
Step 9, after all pile body sleeve pipes press-in ground, concrete perfusion in the cavity between pile body central circular sleeve pipe and outer side sleeve jolt ramming, form concrete pile core that is Y-shaped or X-shaped;
Step 10, by injecting concrete in the cavity of grouting behind shaft or drift lining pipe laterally between sleeve pipe and immersed tube, form stake side cement soil layer;
Step 11, establish template in stake topmast, concreting forms cast-in-place pile cover; After concrete curing expires 28 days, build in stake top casting and lay the thick sand cushion of 300mm ~ 700mm, and lay geo-grid at sand cushion top.
The present invention has the following advantages and beneficial effect:
(1) stake of antiarch curve special is due to the existence of antiarch curved surface, can expand pile body girth, improve the stress performance of pile body when cross sectional area is fixing, improves the ability of pile body opposing transverse bending moment, moment of torsion.
(2) plastic bushing that pile body inner side and outer side is arranged both can be used as the template of pile body concreting, improve pile quality; Concrete pile core and external environment can be isolated again, improve the corrosion resistance of pile body.
(3) sidewall of pile body outer side sleeve is shape of threads, can strengthen the frictional resistance of pile body and the extraneous soil body, improves the supporting capacity of pile body.
(4) by the Grouting Pipe between outside Special plastic sleeve pipe and circular immersed tube to Pile side soil body mud jacking, certain thickness stake side cement soil layer can be formed in stake week, improve the adhesion strength of pile body and Pile side soil body and the supporting capacity of Pile side soil body.
(5) precast pile tip adopts anticorrosion concrete prefabricated, and pile top end face preset can with the close-connected casing plug of double-layer plastic sleeve pipe and tube connector, can guarantee that sleeve pipe and pile top are airtight to be connected, cut off the contact of underground water and concrete pile body from bottom.
In a word, feature of the present invention is the advantage simultaneously with the stake of antiarch curve special and pile tube, not only can improve the stress performance of pile body, increase pile side friction, and the corrosion resistance of pile body and the supporting capacity of Pile side soil body can be improved, the consumption of pile body constructional materials can also be saved, there is good technical economic benefit.
Accompanying drawing explanation
Fig. 1 is the combination stereogram of double-layer plastic sleeve pipe antiarch curve hollow shaped pile of the present invention;
Fig. 2 is the sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile of the present invention;
Fig. 3 is the cross-sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile of the present invention;
Fig. 4 is the cross-sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile reinforcing cage of the present invention;
Fig. 5 is the sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile precast concrete pile pile top of the present invention;
Fig. 6 is the plan view of double-layer plastic sleeve pipe antiarch curve hollow shaped pile precast concrete pile pile top of the present invention;
Fig. 7 is the construction process figure of double-layer plastic sleeve pipe antiarch curve hollow shaped pile of the present invention.
In figure: the threaded plastic bushing of 1-inner circular, 2-outside Y-bandage screw plastic casing, 3-deformed bar cage, 4-inside sleeve tube connector, 5-inner side plastic bushing connects convex falcon, 6-outer side sleeve tube connector, 7-outside plastic bushing connects convex falcon, 8-immersed tube connecting groove, 9-precast reinforced concrete pile point, 10-stake side cement soil layer, the horizontal tension rib of 11-reinforcing cage, 12-reinforcing cage Reinforcement, 13-reinforced concrete pile core, 14-reinforcing cage lateral tie, 15-Grouting Pipe, 16-immersed tube, 17-cast-in-situ steel reinforced concrete pile cover, 18-plastic bushing joint.
Specific embodiment
The design and construction technical requirements of pile body deformed bar cage, the design and construction technical requirements of precast pile tip, the design and construction technical requirements of pile body concrete, reinforcing cage, stake side cement-soil, the bonding construction technical requirement etc. of plastic bushing and casing joint, be not repeated in present embodiment, emphasis sets forth the embodiment that the present invention relates to structure.
Fig. 1 is the combination stereogram of double-layer plastic sleeve pipe antiarch curve hollow shaped pile; Fig. 2 is the sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile of the present invention, and Fig. 3 is the cross-sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile.
With reference to shown in Fig. 1,2,3, double-layer plastic sleeve pipe antiarch curve hollow shaped pile, the threaded plastic bushing 1 of inner circular arranged primarily of pile body center and outside Y-bandage screw plastic casing 2, deformed bar cage 3, precast reinforced concrete pile point 9, stake side cement soil layer 10, reinforced concrete pile core 13, cast-in-situ steel reinforced concrete pile cover 17 form.
The threaded plastic bushing 1 of inner circular, outside Y-bandage screw plastic casing 2, all adopt single wall PVC plastic bellows, often joint cover pipe range 6m; The nominal diameter of the threaded plastic bushing 1 of inner circular is 200mm; The outsourcing circular diameter of outside Y-bandage screw plastic casing 2 is 600mm, and open arc spacing is 300mm.
The threaded plastic bushing 1 of inner circular, outside Y-bandage screw plastic casing 2 all adopt the plastic bushing joint 18 of corresponding size to connect, and plastic bushing joint 18 is double-decker, and adopt PVC straight coupling, the bellmouth degree of depth is 50mm; Often save the threaded plastic bushing 1 of inner circular or bond firmly by PVC adhesive glue between outside Y-bandage screw plastic casing 2 and plastic bushing joint 18.
The external diameter of immersed tube 16 is 700mm, adopts seamless steel pipe.The strength grade of steel is Q345, and thickness 20mm, dimensions meets the requirement of the existing related specifications of specification.
Fig. 5 is the sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile precast concrete pile pile top; Fig. 6 is the plan view of double-layer plastic sleeve pipe antiarch curve hollow shaped pile precast concrete pile pile top; With reference to shown in Fig. 5,6, in double-layer plastic sleeve pipe antiarch curve hollow shaped pile end, precast reinforced concrete pile point 9 is set, precast reinforced concrete pile point 9 is reinforced concrete structure, diameter is 800mm, pile top bottom conically, cone height is 300mm, and top is cylindrical, and cylinder height is 250mm; The strength grade of concrete of precast reinforced concrete pile point 9 is C30, adopts corrosion resistant concrete to build, requires that pile top surfacing is closely knit, and area must not be had to be greater than honeycomb, pitted skin and the losing angle phenomenon of 1%; Employing diameter in pile top inside is III grade of reinforcing bar of 12mm.
Precast reinforced concrete pile point 9 is connected by inserting mode with hollow shaped pile, and the upper face center of precast reinforced concrete pile point 9 is provided with the consistent inside sleeve tube connector 4 of plastic bushing 1 caliber threaded with inner circular and inner side plastic bushing connects convex falcon 5; The diameter that inner side plastic bushing connects convex falcon 5 is 180mm, exceeds upper surface 150mm; The diameter of inside sleeve tube connector 4 is 240mm, exceeds upper surface 200mm, stretches into pile top concrete 200mm.
For the ease of fixing shaped pile, the periphery connecting convex falcon 5 at the upper surface of precast reinforced concrete pile point 9, inner side plastic bushing arranges the fixture consistent with different in nature stake cross section, be embodied in: the outer side sleeve tube connector 6 corresponding with Y-bandage screw plastic casing 2 position, outside, size, profile is set and outside plastic bushing connects convex falcon 7, outside plastic bushing connect convex falcon 7 rectangular or fan annular, exceed upper surface 150mm, wide is 50mm, and limit (arc) is long is 200mm; Outer side sleeve tube connector 6 exceeds upper surface 200mm, and limit (arc) is long is 200mm, stretches into pile top concrete 200mm.
Inside sleeve tube connector 4, outer side sleeve tube connector 6 all adopt light surface and PVC pipe, and pipe thickness is 10mm, and quality and dimensional requirement meet current specifications requirement.
The upper surface of precast reinforced concrete pile point 9 is also provided with immersed tube connecting groove 8, the external diameter 700mm of this groove 8, slot bottom width 30mm, and groove depth is 150mm.
Fig. 4 is the cross-sectional drawing of double-layer plastic sleeve pipe antiarch curve hollow shaped pile reinforcing cage; With reference to shown in Fig. 4, the transverse shape of the precast reinforced cage 3 of abnormity is Y-shaped, its outsourcing circular diameter is 500mm, comprise reinforcing cage horizontal tension rib 11, reinforcing cage Reinforcement 12, reinforcing cage lateral tie 14, the middle part of stirrup is located in horizontal tension rib 11 one end of reinforcing cage, and the other end is vertical with contiguous stirrup; Horizontal tension rib 11 adopts colligation to be connected with between stirrup 14, reinforcing cage Reinforcement 12; Reinforcement 12 adopts diameter to be III grade of indented bars of 22mm; The horizontal tension rib 11 of reinforcing cage and lateral tie 14 all adopt diameter to be the I level reinforcing bar of 10mm, and reinforcing cage transverse direction tension rib 11 is vertically spaced apart 200mm.
After immersed tube 16 and precast reinforced concrete pile point 9 squeeze into ground, in the toroidal cavity that outside Y-bandage screw plastic casing 2 and immersed tube 16 are formed, insert Grouting Pipe 15, Grouting Pipe adopts diameter to be the pvc pipe of 30mm; A side cement soil layer 10 can be formed to mud jacking in the soil body outside pile body by this Grouting Pipe 15.
The concrete of reinforced concrete pile core 13 adopts the pea gravel concreten of C30, and require that concrete aggregate maximum particle diameter is no more than 25mm, concrete work performance meets current specifications requirement; And during concreting, need vibrate evenly along full stake is long with vibrating head.
Fig. 7 is the construction process figure of double-layer plastic sleeve pipe antiarch curve hollow shaped pile of the present invention, and with reference to shown in Fig. 7, the work progress of double-layer plastic sleeve pipe antiarch curve hollow shaped pile comprises:
Step one, smooth location, laying depth is the sand cushion of 300mm;
Step 2, precast reinforced concrete pile point 9, pile top end face diameter is the large 200mm of outside immersed tube 16 comparatively, and arrange at its end face and be used for the pile body central circular that is connected with the threaded plastic bushing of inner circular 1 and overlap pipe connected pipe 4 and inner side plastic bushing connects convex falcon 5, the outer side sleeve tube connector 6 be connected with outside Y-bandage screw plastic casing 2 and outside plastic bushing connect convex falcon 7, survey with pile body the immersed tube connecting groove 8 that immersed tube 16 is connected outward;
Step 3, with the casing joint respectively threaded plastic bushing 1 of inner circular of spreading bilayer sleeve and outside Y-bandage screw plastic casing 2, sleeve pipe total length is made to exceed designing pile length 200mm ~ 300mm;
Step 4, first the convex falcon 5 of threaded for the inner circular at pile body center plastic bushing 1 and precast pile tip 9 and casing joint 4 are connected sealing, and use PVC adhesive cementation, again precast reinforced cage 3 is placed on the outside of pile body center inside circular strip screw plastic casing 1, finally socket outside Y-bandage screw plastic casing 2, and outside Y-bandage screw plastic casing 2 is connected with the tube connector of precast pile tip 9 and seals;
Sleeve pipe with pile top 9 stretches in outside steel pipe immersed tube 16 from bottom by step 5, first employing lifting rope, then is inserted in immersed tube spacing ring by grouting behind shaft or drift lining pipe, is finally connected with precast pile tip 9 closely by immersed tube 16;
Step 6, the immersed tube 16, the threaded plastic bushing 1 of inner circular, outside Y-bandage screw plastic casing 2, the Grouting Pipe 15 that adopt stake pile driver will to connect with precast pile tip 9, evenly squeeze in ground together with reinforcing cage 3;
Step 7, lifting immersed tube 16, stay in foundation soil body by circular strip screw plastic casing 1, outside Y-bandage screw plastic casing 2, Grouting Pipe 15;
Step 8, pile driver is moved to next position;
Step 9, after all pile body sleeve pipes press-in ground, concrete perfusion in the cavity to the inside between circular strip screw plastic casing 1 and outside Y-bandage screw plastic casing 2 jolt ramming, form Y-shaped concrete pile core;
Step 10, by injecting a small amount of concrete in the cavity of grouting behind shaft or drift lining pipe 15 laterally between Y-bandage screw plastic casing 2 and immersed tube 16, form stake side cement soil layer;
Step 11, establish template in stake topmast, concreting forms cast-in-place pile cover; After concrete curing expires 28 days, build in stake top casting and lay the thick sand cushion of 400mm, and lay geo-grid at sand cushion top.
According to the content that above embodiment is recorded, described shaped pile cross section can be also X-shaped, and related content is not specifically set forth, but also within protection scope of the present invention.
Claims (5)
1. the construction method of double-layer plastic sleeve pipe antiarch curve hollow shaped pile, this double-layer plastic sleeve pipe antiarch curve hollow shaped pile comprises antiarch curve hollow shaped pile and precast reinforced concrete pile point; Y-shaped or the X-shaped in the cross section of antiarch curve hollow shaped pile, the circular hole of connectivity is established at pile body center vertically, is respectively equipped with threaded sleeve pipe outside pile body center and pile body; Establish in pile body with pile body similar shape but the reinforcing cage of 100 ~ 200mm less of pile body, horizontal tension rib is set in reinforcing cage; Conically, establish the fixture corresponding with the profile of sleeve pipe, reinforcing cage, immersed tube, size at the end face of precast reinforced concrete pile point, this fixture is specially convex falcon, tube connector and groove in the bottom of precast reinforced concrete pile point;
It is characterized in that comprising the following steps:
Step one, smooth location, laying depth is sand cushion, the hardcore bed of 200mm ~ 300mm or slag blanket of gently delaying;
Step 2, precast reinforced concrete pile point, pile top end face diameter compared with the large 150mm ~ 250mm of outside immersed tube, and arranges the cover pipe connected pipe and convex falcon that are used for being connected with double-layer plastic sleeve pipe, the groove be connected with immersed tube outside pile body at its end face;
Step 3, inner and outer tubes with casing joint respectively spreading bilayer sleeve, make sleeve pipe total length exceed designing pile length 200mm ~ 300mm;
Step 4, first the convex falcon of threaded for the inner circular at pile body center plastic bushing and precast pile tip and casing joint are connected seal, and use PVC adhesive cementation, again precast reinforced cage is placed on the outside of pile body center inside circular strip screw plastic casing, finally be socketed outer side sleeve, and outer side sleeve be connected with the tube connector of precast pile tip and seal;
Sleeve pipe with pile top stretches in the steel pipe immersed tube of outside from the bottom of outside steel pipe immersed tube by step 5, first employing lifting rope, then is inserted in immersed tube spacing ring by grouting behind shaft or drift lining pipe, is finally connected with precast pile tip closely by immersed tube;
Step 6, the immersed tube, pile body central circular sleeve pipe, outer side sleeve, the Grouting Pipe that adopt stake pile driver will to connect with precast pile tip, evenly squeeze in ground together with reinforcing cage;
Step 7, lifting immersed tube, stay in foundation soil body by pile body central circular sleeve pipe, reinforcing cage, outer side sleeve;
Step 8, pile driver is moved to next position;
Step 9, after all pile body sleeve pipes press-in ground, concrete perfusion in the cavity between pile body central circular sleeve pipe and outer side sleeve jolt ramming, form concrete pile core that is Y-shaped or X-shaped;
Step 10, by injecting concrete in the cavity of grouting behind shaft or drift lining pipe laterally between sleeve pipe and immersed tube, form stake side cement soil layer;
Step 11, establish template in stake topmast, concreting forms cast-in-place pile cover; After concrete curing expires 28 days, build in stake top casting and lay the thick sand cushion of 300mm ~ 700mm, and lay geo-grid at sand cushion top.
2. the construction method of double-layer plastic sleeve pipe antiarch curve hollow shaped pile according to claim 1, it is characterized in that in described step 3, internal and external casing is threaded plastic bushing, Y-shaped or the X-shaped of outer side sleeve, inside sleeve is rounded, and each joint sleeve pipe is fixedly connected with adopting the mode of adhesive or riveted joint between casing joint.
3. the construction method of double-layer plastic sleeve pipe antiarch curve hollow shaped pile according to claim 2, is characterized in that described internal and external casing is single wall screw pvc pipe, PE pipe.
4. the construction method of double-layer plastic sleeve pipe antiarch curve hollow shaped pile according to claim 1, between the adjacent stirrup that it is characterized in that precast reinforced cage in described step 4, horizontal tension rib is set, by colligation or be welded to connect between this horizontal tension rib and stirrup, vertical applied force reinforcing bar.
5. the construction method of double-layer plastic sleeve pipe antiarch curve hollow shaped pile according to claim 4, is characterized in that the middle part of stirrup is fixed in one end of horizontal tension rib, the other end and contiguous stirrup is vertical fixes.
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| CN201310426114.8A CN103485334B (en) | 2013-09-18 | 2013-09-18 | Bi-layer plastic-bushing inverted-arch cambered hollow special-shaped pile and construction method |
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| CN104141304B (en) * | 2014-08-06 | 2016-02-24 | 冠鲁建设股份有限公司 | The construction method of a kind of extrusion molding preformed pile stiff-core cement soil Y shape stake |
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