CN107034877B - Combine post jacking device and its construction method in pile end stake side - Google Patents

Combine post jacking device and its construction method in pile end stake side Download PDF

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Publication number
CN107034877B
CN107034877B CN201710347157.5A CN201710347157A CN107034877B CN 107034877 B CN107034877 B CN 107034877B CN 201710347157 A CN201710347157 A CN 201710347157A CN 107034877 B CN107034877 B CN 107034877B
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reinforcement cage
steel reinforcement
steel
stake
mud jacking
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CN107034877A (en
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戴国亮
万志辉
邓会元
龚维明
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Southeast University
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Southeast University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/36Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts

Abstract

The invention discloses a kind of pile end stake sides to combine post jacking device, including steel reinforcement cage, the lateral elasticity cavity that is coated on steel reinforcement cage lower outside, be fixed on steel reinforcement cage for being the side squeezing unit of lateral elasticity cavity slip casting and for the end squeezing unit for steel reinforcement cage end mud jacking, wherein the lateral elasticity cavity includes elastic film and positioned at elastic film upper/lower terminal and clamps the double-deck steel loop of the elastic film, the bilayer steel loop is fixedly connected by steel bar with steel reinforcement cage, and forms gap between lateral elasticity cavity and steel reinforcement cage;The steel reinforcement cage is outer, in elastic film, close on and be arranged with rubber pneumatic bag device at Dual-layer steel loop respectively.Post jacking device is combined using pile end stake of the present invention side, the load-carrying properties of pile foundation can be effectively improved, reduces settlement amount of pile foundation, cost is greatly lowered;The device of the invention simple structure, construction method are reasonable, easy to operate, securely and reliably, are suitble to install at the construction field (site), easy to promote and utilize.

Description

Combine post jacking device and its construction method in pile end stake side
Technical field
The present invention relates to the bored concrete pile squeezing units and its construction method more particularly to pile end of field of civil engineering Stake side combination post jacking device and its construction method.
Background technique
Bored concrete pile is the most commonly used base form that builds a bridge, because its selection flexibly, construction be not subject to seasonal restrictions, The advantages that environmental pollution is smaller, the base form is using more and more extensive.But since filling pile construction is in the process to soil around pile And the disturbance of bearing course at pile end, and side mudcake and a sediment of the hole bottom are generated, to influence pile quality, cause bearing capacity of pile foundation big It is big to reduce.And post-grouting technology can improve above-mentioned problem, improve Ultimate Bearing Capacity, reduce settling amount, therefore, in recent years The technology is widely used and develops.
But there is uncertain and influence factor complexity during stake side pressure grouting or pile tip grouting in common post-grouting technology, Pressure slurries make it that can not form ideal geometry slurry bubble body in the randomness of stake side or stake end flow direction, meanwhile, it estimates Reasonable mud jacking amount and mud jacking pressure cannot be effectively controlled, thus the vertical bearing capacity for causing bored concrete pile show compared with Big discreteness makes post jacking that required effect often be not achieved.So how to solve the above problems is to effectively improve stake The key of end resistance and pile side friction keeps post-grouting technology more reasonable.
It would therefore be highly desirable to solve the above problems.
Summary of the invention
Goal of the invention: the first object of the present invention be to provide it is a kind of can solve a side or stake end slurries flow direction not really Qualitative question forms ideal geometry slurry bubble body, and efficiently controls the pile end stake side combination of mud jacking amount and mud jacking pressure Post jacking device.
Another goal of the invention of the invention is to provide the construction method of pile end stake side combination post jacking device.
Technical solution: in order to achieve the above object, post jacking device is combined in a kind of pile end stake side of the present invention, Including steel reinforcement cage, the lateral elasticity cavity that is coated on steel reinforcement cage lower outside, be fixed on steel reinforcement cage for for lateral elasticity The side squeezing unit of cavity slip casting and for the end squeezing unit for steel reinforcement cage end mud jacking, wherein the lateral elasticity chamber Body includes elastic film and positioned at elastic film upper/lower terminal and clamps the double-deck steel loop of the elastic film, and the bilayer steel loop is logical It crosses steel bar to be fixedly connected with steel reinforcement cage, and forms gap between lateral elasticity cavity and steel reinforcement cage;The steel reinforcement cage is outer, elastic In film, closes on and be arranged with rubber pneumatic bag device at Dual-layer steel loop respectively.
Preferably, several lateral elasticity cavitys are placed within the scope of full pile cutoff from bottom to top on the outside of the steel reinforcement cage.
Wherein, the rubber pneumatic bag device includes air bag hose, the hard steel pipe and high torque for connecting air bag hose both ends Bicyclic pipe clamp is connected with air bag madjack pipe on the hard steel pipe, and air bag madjack pipe is fixed on steel reinforcement cage, extends to steel reinforcement cage Top.
Preferably, the quantity of the end squeezing unit is at least two, is distributed on steel reinforcement cage, every one end mud jacking dress It sets including end mud jacking device and pile tip grouting pipe, the pile tip grouting pipe is fixed on the inside of steel reinforcement cage, extends at the top of steel reinforcement cage.
Further, the quantity of the side squeezing unit is at least two, is distributed on steel reinforcement cage, each side mud jacking dress It sets including side mud jacking device and stake side pressure grouting pipe, this side pressure grouting pipe upwardly extends supreme clad steel ring from steel reinforcement cage exterior bottom Place is to infolding, then along steel reinforcement cage disposed inboard, until at the top of steel reinforcement cage;The side mud jacking device is located in elastic film.
The construction method of combination post jacking device in a kind of pile end stake side of the invention, which is characterized in that including as follows Step:
(1) precast reinforced cage, the double-deck steel loop, elastic film, rubber pneumatic bag device, end squeezing unit and side mud jacking dress It sets;
(2) the interior steel ring welding in the double-deck steel loop is fixed on to the lower part of steel reinforcement cage using steel bar, up and down between interior steel loop It is separated by a distance;
(3) mounting end squeezing unit: pile tip grouting pipe is symmetrically fixed on the inside of steel reinforcement cage, and end mud jacking device is located at stake Hold the lower end of madjack pipe;
(4) side squeezing unit is installed: stake side pressure grouting pipe is symmetrically fixed on steel reinforcement cage, stake side pressure grouting pipe is from steel reinforcement cage Exterior bottom upwardly extends at supreme interior steel loop to infolding, then along steel reinforcement cage disposed inboard, until at the top of steel reinforcement cage;Bending part Stake side pressure grouting pipe is connected by elbow;
(5) rubber pneumatic bag device is installed: outside steel reinforcement cage, up and down between steel loop, and close at Dual-layer steel loop and cover If two rubber pneumatic bag devices, the air bag madjack pipe of each rubber pneumatic bag device extends upwardly to reinforcing bar cage top on the inside of steel reinforcement cage Portion;
(6) lateral elasticity cavity is installed: the upper and lower ends of elastic film are fixed on corresponding interior steel loop by outer steel loop On, complete the assembly of pile end stake side combination post jacking device;
(7) by the pile end stake side assembled combination post jacking device hang to stake position, to rubber pneumatic bag device into Row gas-flow closure;
(8) casting concrete in the hole of stake position, concrete initial set formed pile body, to pile tip grouting pipe, stake side pressure grouting pipe into Row pressure water opens plug test, dredges mud jacking pipeline and opens end mud jacking device and side mud jacking device;
(9) mud jacking is carried out to rubber pneumatic bag device, terminates mud jacking when mud jacking amount reaches the 90% of discreet value, and double up and down Rigid boundary condition is formed at layer steel loop;
(10) mud jacking is carried out to stake side, a side slurries is made radially to diffuse to form ideal column somaplasm in lateral elasticity cavity Bubble terminates mud jacking when mud jacking amount reaches the 90% of discreet value;
(11) after the completion of stake side pressure grouting, rigid boundary condition is formed in steel reinforcement cage bottom;Mud jacking is carried out to stake end, so that stake End slurries are radial or diffuse to form ideal orbicule slurry bubble downwards, terminate mud jacking when mud jacking amount reaches the 90% of discreet value.
The utility model has the advantages that compared with prior art, the present invention has following remarkable advantage:
1) present invention solves a side and stake end slurries by installing rubber pneumatic bag and lateral elasticity cavity on steel reinforcement cage The uncertainty of flow direction, and the problem of ideal geometry slurry bubble body cannot be formed, make grout pile side friction and stake end Resistance is effectively improved;
2) pile foundation being perfused using present invention combination squeezing unit, can effectively improve the load-carrying properties of pile foundation, reduce Cost is greatly lowered in settlement amount of pile foundation;
3) present invention can calculate the mud jacking amount of rubber pneumatic bag device according to the size of air bag hose in rubber pneumatic bag device, The slurries amount being pressed into air bag hose is controlled 90%, prevents mud jacking from excessively causing rubber pneumatic bag failure of apparatus;Stake end, stake side pressure Slurry amount can be estimated by ideal stake end spherical and stake lateral column body is formed, the slurries in jacked pile end, stake side pressure grouting pipe Amount is preferably controlled the 90% of estimated value, and stake end, stake side pressure grouting pressure can be obtained according to ball (column) bore expansion theoretical calculation;The present invention Realization efficiently controls mud jacking amount and mud jacking pressure, reduces uncertain factor during post jacking, it is expected that guarantee reaches post jacking Effect;
4) the device of the invention simple structure, construction method are reasonable, easy to operate, securely and reliably, economic and practical, are suitble to Construction site installation, it is easy to promote and utilize.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention;
Fig. 2 is top view of the invention;
Fig. 3 is the structural schematic diagram of rubber pneumatic bag device in the present invention;
Fig. 4 is the structural schematic diagram of lateral elasticity cavity in the present invention;
Fig. 5 is the structural schematic diagram using pile body prepared by the present invention.
Specific embodiment
Technical solution of the present invention is described further with reference to the accompanying drawing.
As depicted in figs. 1 and 2, a kind of pile end stake side combination post jacking device of the invention include steel reinforcement cage 1, it is lateral Flexible cavity 2, side squeezing unit 3, end squeezing unit 4 and rubber pneumatic bag device 5.As shown in figure 4, lateral elasticity cavity 2 It is coated on 1 lower outside of steel reinforcement cage, lateral elasticity cavity 2 is including elastic film 201 and is located at 201 upper/lower terminal of elastic film And the double-deck steel loop 202 of the elastic film 201 is clamped, which is fixedly welded by steel bar 203 with steel reinforcement cage 1, and Gap is formed between lateral elasticity cavity 2 and steel reinforcement cage 1;The length of steel bar 203 determines the size in gap, and the steel bar 203 length need to meet the thickness requirement of concrete cover.Side squeezing unit 3 is fixed on steel reinforcement cage 1, for being lateral Slip casting is carried out in flexible cavity 2.The quantity of above-mentioned side squeezing unit 3 is at least two, is distributed on steel reinforcement cage 1, each side Squeezing unit 3 include side mud jacking device 301 and stake side pressure grouting pipe 302, this side pressure grouting pipe 302 from 1 exterior bottom of steel reinforcement cage to On extend at the double-deck steel loop 202 to infolding, then along 1 disposed inboard of steel reinforcement cage, until 1 top of steel reinforcement cage;The side pressure Slurry device 301 is located in lateral elasticity cavity 2.And it is realized and is connected by elbow between the stake side pressure grouting pipe 302 of bending part.The present invention By installing rubber pneumatic bag and lateral elasticity cavity on steel reinforcement cage, solve the uncertain of a side and stake end slurries flow direction Property, and the problem of ideal geometry slurry bubble body cannot be formed, mention grout pile side friction and end resistance effectively It is high.
The distance between bilateral steel loop is according to " technical code for building pile foundation " and " highway bridge and culvert ground and base above and below the present invention Plinth design specification " it can be identified as 12m, i.e. stake side pressure grouting plays humidification to pile body 12m.The present invention only gives at stake end Laid lateral elasticity cavity between the position 12m of stake end, can, geological conditions long according to stake and bearing capacity of pile foundation etc. want It asks, is laying lateral elasticity cavity again apart from the stake end position 12m and between the position 24m of stake end, can also wanted according to spacing It asks within the scope of the long full pile cutoff of stake and is covered with lateral elasticity cavity.
Above-mentioned end squeezing unit 4 is fixed on steel reinforcement cage 1, for carrying out slip casting for 1 end of steel reinforcement cage.End mud jacking The quantity of device 4 is at least two, is distributed on steel reinforcement cage 1, and every one end squeezing unit 4 includes end mud jacking device 401 and stake end Madjack pipe 402, the pile tip grouting pipe 402 is fixed on the inside of steel reinforcement cage 1, extends to 1 top of steel reinforcement cage.Pile tip grouting pipe of the present invention Number is generally laid according to stake diameter size, as D < 1200mm, lays 2 pile tip grouting pipes;As 1200mm≤D≤2500mm, 3 are laid Root pile tip grouting pipe;Work as D > 2500mm, lays 4 pile tip grouting pipes.And stake side also can be big according to stake diameter according to pile tip grouting pipe Small laying, and surrounding is uniform or is symmetrically arranged on steel reinforcement cage.
As shown in figure 3, the present invention during casting concrete in order to prevent concrete to expanding on the outside of the flexible cavity of stake side Rigid boundary condition is formed at scattered and stake side pressure grouting stage Dual-layer steel loop, using rubber pneumatic bag device 5 to Dual-layer steel Ring portion position is sealed, and wherein rubber pneumatic bag device 5 includes air bag hose 501, the hard steel pipe for connecting 501 both ends of air bag hose 502 and the bicyclic pipe clamp 503 of high torque, air bag madjack pipe 504, air bag mud jacking are connected with by elbow on the hard steel pipe 502 Pipe 504 is fixed on steel reinforcement cage 1, extends to 1 top of steel reinforcement cage.Using the bicyclic pipe clamp 503 of high torque by air bag hose 501 and firmly The connecting portion of matter steel pipe 502 connects to form airtight sealing.
The present invention is pressed into the intracorporal slurry of lateral elasticity chamber by the fixing fabric structure stake side pressure grouting amount of the lateral flexible cavity of calculating Liquid measure control is 90%, and stake end stake side pressure grouting can form ideal stake lateral column shape and stake end spherical on demand, and mud jacking pressure can It is calculated according to shape is formed;Present invention realization efficiently controls mud jacking amount and mud jacking pressure, reduces post jacking in the process not Determine factor, guarantee reaches post jacking expected effect.
A kind of construction method of combination post jacking device in pile end stake side of the invention, includes the following steps:
(1) precast reinforced cage 1, double-deck steel loop 202, elastic film 201, rubber pneumatic bag device 5,4 and of end squeezing unit Side squeezing unit 3;
(2) the interior steel ring welding in the double-deck steel loop 202 is fixed on to the lower part of steel reinforcement cage 1 using steel bar 203, up and down interior steel It is separated by a distance between ring;
(3) pile tip grouting pipe 402 mounting end squeezing unit 4: is symmetrically fixed on 1 inside of steel reinforcement cage, end mud jacking device 401 are located at the lower end of pile tip grouting pipe 402;
(4) side squeezing unit 3 is installed: stake side pressure grouting pipe 302 being symmetrically fixed on steel reinforcement cage 1, stake side pressure grouting pipe 302 It upwardly extends from supreme interior steel loop from 1 exterior bottom of steel reinforcement cage to infolding, then along 1 disposed inboard of steel reinforcement cage, until steel reinforcement cage 1 pushes up Portion;The stake side pressure grouting pipe 302 of bending part is connected by elbow;
(5) installation rubber pneumatic bag device 5: outside steel reinforcement cage 1, between upper and lower interior steel loop, and set at interior steel loop up and down is closed on If the air bag madjack pipe 504 of two rubber pneumatic bag devices 5, each rubber pneumatic bag device 5 extends upwardly to reinforcing bar on the inside of steel reinforcement cage 1 1 top of cage;
(6) lateral elasticity cavity 2 is installed: the upper and lower ends of elastic film 201 are bolted to by outer steel loop On corresponding interior steel loop, the assembly of pile end stake side combination post jacking device is completed;
(7) by the pile end stake side assembled combination post jacking device hang to stake position, to rubber pneumatic bag device 5 into Row gas-flow closure prevents concrete to diffusion on the outside of the flexible cavity of stake side, and the gap between steel reinforcement cage and stake side wall is made to meet concrete Protective layer thickness requirement;
(8) casting concrete in the hole of stake position, concrete initial set forms pile body, to pile tip grouting pipe 402, stake side pressure grouting pipe 302, which carry out pressure water, opens plug test, dredges mud jacking pipeline and opens end mud jacking device 401 and side mud jacking device 301;
(9) mud jacking is carried out to rubber pneumatic bag device 5, terminates mud jacking when mud jacking amount reaches the 90% of discreet value, prevents mud jacking Rubber pneumatic bag failure of apparatus excessively is caused, and forms rigid boundary condition at Dual-layer steel loop 202;
(10) mud jacking is carried out to stake side, a side slurries is made radially to diffuse to form ideal column in lateral elasticity cavity 2 Slurry bubble terminates mud jacking when mud jacking amount reaches the 90% of discreet value;
(11) after the completion of stake side pressure grouting, rigid boundary condition is formed in 1 bottom of steel reinforcement cage;Mud jacking is carried out to stake end, so that Stake end slurries are radial or diffuse to form ideal orbicule slurry bubble downwards, terminate mud jacking when mud jacking amount reaches the 90% of discreet value, such as Shown in Fig. 5.
The pile foundation being perfused using present invention combination squeezing unit, can effectively improve the load-carrying properties of pile foundation, reduce stake Base settling amount, is greatly lowered cost;The device of the invention simple structure, construction method are reasonable, easy to operate, securely and reliably, It is economic and practical, it is suitble to install at the construction field (site), it is easy to promote and utilize.

Claims (5)

1. post jacking device is combined in a kind of pile end stake side, it is characterised in that: including steel reinforcement cage (1), be coated on steel reinforcement cage (1) the lateral elasticity cavity (2) of lower outside, be fixed on steel reinforcement cage (1) for for lateral elasticity cavity (2) slip casting side Portion's squeezing unit (3) and for for steel reinforcement cage (1) end mud jacking end squeezing unit (4), wherein the lateral elasticity cavity (2) include elastic film (201) and be located at elastic film (201) upper/lower terminal and clamp the clad steel of the elastic film (201) Ring (202), the bilayer steel loop (202) are fixedly connected by steel bar (203) with steel reinforcement cage (1), and in lateral elasticity cavity (2) and Steel reinforcement cage forms gap between (1);The steel reinforcement cage (1) is outside, elastic film (201) is interior, closes at Dual-layer steel loop (202) It is arranged with respectively rubber pneumatic bag device (5), the rubber pneumatic bag device (5) includes air bag hose (501), connection air bag hose (501) the hard steel pipe (502) and the bicyclic pipe clamp of high torque (503) at both ends is connected with air bag pressure on the hard steel pipe (502) Slurry pipe (504), air bag madjack pipe (504) are fixed on steel reinforcement cage (1), are extended at the top of steel reinforcement cage (1).
2. post jacking device is combined in pile end stake according to claim 1 side, it is characterised in that: outside the steel reinforcement cage Side is placed with several lateral elasticity cavitys (2) within the scope of full pile cutoff from bottom to top.
3. post jacking device is combined in pile end stake according to claim 1 side, it is characterised in that: the end mud jacking The quantity of device (4) is at least two, is distributed on steel reinforcement cage (1), every one end squeezing unit (4) includes end mud jacking device (401) it is fixed on the inside of steel reinforcement cage (1) with pile tip grouting pipe (402), the pile tip grouting pipe (402), extends to steel reinforcement cage (1) top Portion.
4. post jacking device is combined in pile end stake according to claim 1 side, it is characterised in that: the side mud jacking The quantity of device (3) is at least two, is distributed on steel reinforcement cage (1), each side squeezing unit (3) includes side mud jacking device (301) and stake side pressure grouting pipe (302), this side pressure grouting pipe (302) upwardly extend supreme clad steel from steel reinforcement cage (1) exterior bottom To infolding at ring (202), then along steel reinforcement cage (1) disposed inboard, until at the top of steel reinforcement cage (1);Side mud jacking device (301) position In lateral elasticity cavity (2).
5. the construction method of post jacking device, feature are combined in pile end stake according to claim 1 to 4 side It is, includes the following steps:
(1) precast reinforced cage (1), the double-deck steel loop (202), elastic film (201), rubber pneumatic bag device (5), end squeezing unit (4) and side squeezing unit (3);
(2) the interior steel ring welding in the double-deck steel loop (202) is fixed on to the lower part of steel reinforcement cage (1) using steel bar (203), it is interior up and down It is separated by a distance between steel loop;
(3) mounting end squeezing unit (4): pile tip grouting pipe (402) is symmetrically fixed on the inside of steel reinforcement cage (1), end mud jacking Device (401) is located at the lower end of pile tip grouting pipe (402);
(4) side squeezing unit (3) are installed: stake side pressure grouting pipe (302) are symmetrically fixed on steel reinforcement cage (1), stake side pressure grouting pipe (302) from steel reinforcement cage (1), exterior bottom is upwardly extended from supreme interior steel loop to infolding, then along steel reinforcement cage (1) disposed inboard, until At the top of steel reinforcement cage (1);The stake side pressure grouting pipe (302) of bending part is connected by elbow;
(5) rubber pneumatic bag device (5) are installed: steel reinforcement cage (1) outside, up and down between steel loop, and close in up and down and covered at steel loop If two rubber pneumatic bag devices (5), the air bag madjack pipe (504) of each rubber pneumatic bag device (5) prolongs upwards on the inside of steel reinforcement cage (1) It extends at the top of steel reinforcement cage (1);
(6) lateral elasticity cavity (2) are installed: the upper and lower ends of elastic film (201) is fixed in corresponding by outer steel loop On steel loop, the assembly of pile end stake side combination post jacking device is completed;
(7) the pile end stake side assembled combination post jacking device is hung to stake position, rubber pneumatic bag device (5) is carried out Gas-flow closure;
(8) casting concrete in the hole of stake position, after pile concrete initial set, to pile tip grouting pipe (402), stake side pressure grouting pipe (302) it carries out pressure water and opens plug test, dredge mud jacking pipeline and open end mud jacking device (401) and side mud jacking device (301);
(9) mud jacking is carried out to rubber pneumatic bag device (5), terminates mud jacking when mud jacking amount reaches the 90% of discreet value, and double up and down Rigid boundary condition is formed at layer steel loop (202);
(10) mud jacking is carried out to stake side, a side slurries is made radially to diffuse to form ideal column somaplasm in lateral elasticity cavity (2) Bubble terminates mud jacking when mud jacking amount reaches the 90% of discreet value;
(11) after the completion of stake side pressure grouting, rigid boundary condition is formed in steel reinforcement cage (1) bottom;Mud jacking is carried out to stake end, so that stake End slurries are radial or diffuse to form ideal sphere slurry bubble downwards, terminate mud jacking when mud jacking amount reaches the 90% of discreet value.
CN201710347157.5A 2017-05-17 2017-05-17 Combine post jacking device and its construction method in pile end stake side Active CN107034877B (en)

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Publication number Priority date Publication date Assignee Title
CN107916671A (en) * 2017-12-06 2018-04-17 徐州迈斯特机械科技有限公司 A kind of tunnel pile foundation pouring construction device
CN111021402B (en) * 2019-11-11 2021-05-25 合肥学院 Grouting type anchoring foundation with inner bag and outer bag and construction method thereof
CN113513054B (en) * 2021-09-15 2021-11-30 江苏中云筑智慧运维研究院有限公司 Pile foundation grouting pressure testing device and method based on optical fiber sensing

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CN102644284A (en) * 2012-04-11 2012-08-22 沈阳中建东设岩土工程有限公司 Method and device for post grouting in pile bottom
CN103114578A (en) * 2013-02-06 2013-05-22 上海市建工设计研究院有限公司 Grouting molding pedestal pile and construction method thereof and pedestal expanding device
CN103741683A (en) * 2013-12-23 2014-04-23 浙江天润建设有限公司 Bag bottom expanding rigid-flexible combined pile and construction method thereof

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JPH08209688A (en) * 1995-02-02 1996-08-13 Asahi Chem Ind Co Ltd Ready-made pile having bag body
CN102587358A (en) * 2012-03-27 2012-07-18 河海大学 Technology of high polymer material post-grouting squeezed cast-in-place pile
CN102644284A (en) * 2012-04-11 2012-08-22 沈阳中建东设岩土工程有限公司 Method and device for post grouting in pile bottom
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