CN103114578A - Grouting molding pedestal pile and construction method thereof and pedestal expanding device - Google Patents

Grouting molding pedestal pile and construction method thereof and pedestal expanding device Download PDF

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Publication number
CN103114578A
CN103114578A CN2013100482654A CN201310048265A CN103114578A CN 103114578 A CN103114578 A CN 103114578A CN 2013100482654 A CN2013100482654 A CN 2013100482654A CN 201310048265 A CN201310048265 A CN 201310048265A CN 103114578 A CN103114578 A CN 103114578A
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CN
China
Prior art keywords
cloth bag
geotechnological cloth
reinforcing cage
expansion
pile
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Granted
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CN2013100482654A
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Chinese (zh)
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CN103114578B (en
Inventor
胡玉银
孔德志
陈建兰
朱小军
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Shanghai tongrenli Geotechnical Engineering Technology Co.,Ltd.
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Shanghai Construction Group Design Institute Co Ltd
Shanghai Construction No 4 Group Co Ltd
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Priority to CN201310048265.4A priority Critical patent/CN103114578B/en
Publication of CN103114578A publication Critical patent/CN103114578A/en
Application granted granted Critical
Publication of CN103114578B publication Critical patent/CN103114578B/en
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Abstract

The invention discloses a pedestal expanding device which comprises a geotechnical cloth bag and a grouting pipe, wherein the geotechnical cloth bag is sleeved on the outer side of the bottom of a steel reinforcement cage. The upper end and the lower end of the geotechnical cloth bag are fixed with the bottom of the steel reinforcement cage. The middle portion of the geotechnical cloth bag is tightened by a plurality of elastic bands, and one end of the grouting pipe is inserted into the geotechnical cloth bag. The invention further discloses a grouting molding pedestal pile and a construction method thereof. The method includes the steps of setting the pedestal expanding device on the outer side of the bottom of the steel reinforcement cage, and placing downward the steel reinforcement cage provided with the pedestal expanding device at the bottom in place, and pouring concrete into the steel reinforcement cage, and beginning to grout after the maintenance of the concrete. The geotechnical cloth bag of the pedestal expanding device forms a plump cylindrical grouting bag structural body under the filling of cement paste, the diameter of the geotechnical cloth bag swells continuously along with the injection of the cement paste liquid and is expanded, then the geotechnical cloth bag can squeeze the concrete around and enables the soil body around to be dense, and finally a pile end expanding head is formed, so occlusion capacity of pile soil and bearing capacity of the pile can be greatly improved.

Description

Device at the bottom of injection forming expanded bore pile and job practices thereof and expansion
Technical field
The present invention relates to the realm of building construction, is a kind of expansion bottom application work method and expansion end device of suitable bored pile.
Background technology
Existing Post Grouting Technique is, by bury the high-pressure slip-casting flexible pipe underground on stake side different depth place reinforcing cage, after the bored pile concreting, by pre-buried pipe, cement mortar injected stake side soil layer to improve a kind of technology of pile side friction.According to the result of some tests, think can reach reasonable effect after rear mud jacking is processed, can improve 30%~70% to the bearing capacity of single pile in fine grained soils; To the stake in coarse-grained soil, amplification can reach 60%~120%.The shearing rigidity that side frictional resistance effect after mud jacking shows as side friction raising and stake side soil improves; Thereby after the shift value when frictional resistance is given full play to moved, this toughness that just means stake increased.But stake rear flank slurry injection technique is the Shortcomings part also, and namely the flow path of uncontrollable slurries, the running pulp phenomenon easily occurs, and reliability ratio is relatively poor.
Existing expanded bore pile often needs to adopt special plant equipment to expand end pore-forming, thereby reach the purpose that improves the pile body uplift resistance, but expand the complex process at the end, construction cost is high, is also a major reason that causes existing expanded bore pile to be difficult to promote because the collapse hole phenomenon that causes after soil body reaming causes pile quality unstable simultaneously.
although, open on 07 25th, 2012, document number is the Chinese invention patent of CN102605773, job practices and the extruding-spreading device thereof of injection forming bell-out bored pile are disclosed, this a kind of extruding-spreading device, comprise flange, the some distributing bars that distribute ringwise vertically are set on this flange, on this flange also vertical welding one velamen be trapped among steel pipe between described distributing bar, the outer wall of being close to described steel pipe is wound with grouting tube, also cover has one between steel pipe and the distributing bar outside steel pipe, and the cylindrical geotechnological cloth bag in the grouting tube bottom is wrapped in, these two ends, geotechnique's cloth bag up and down all are fixed on steel pipe by the larynx hoop.This shows, in this technical scheme, need a steel pipe, need first steel-pipe welding on the bottom of reinforcing cage, and then geotechnological cloth bag is enclosed within the steel pipe outside, complicated structure, construction technology is also more loaded down with trivial details.
Therefore, how to provide a kind of construction technology simple, convenient, can increase substantially the native interlocking of stake, improve that device is the technical problem that those skilled in the art need to be resolved hurrily at the bottom of the injection forming expanded bore pile of bearing capacity and job practices and expansion.
Summary of the invention
The object of the present invention is to provide device at the bottom of a kind of injection forming expanded bore pile and job practices and expansion, its construction technology is simple, can increase substantially the native interlocking of stake, improves bearing capacity.
To achieve the above object, the present invention adopts following technical scheme:
Device at the bottom of a kind of expansion, comprise geotechnological cloth bag and Grouting Pipe, described geotechnological cloth bag is sheathed on the bottom outside of reinforcing cage, the upper and lower end of described geotechnological cloth bag fixes with the bottom of described reinforcing cage respectively, tighten with some roads elastic cord the middle part of described geotechnological cloth bag, described geotechnological cloth bag integral body is hollow cylinder, described geotechnological cloth bag is double-decker, upper lower sealing at least and has at least one for the inner chamber that holds injection slurry, one end of described Grouting Pipe is connected with described geotechnological cloth bag, the external slip casting of the other end of described Grouting Pipe source.
Preferably, in device at the bottom of above-mentioned expansion, the cuff cloth bag is offered on the top of described geotechnological cloth bag, and the top of described cuff cloth bag has the opening for an end insertion of described Grouting Pipe, and the bottom of described cuff cloth bag is communicated with the inner chamber of described geotechnological cloth bag.
Preferably, in device at the bottom of above-mentioned expansion, the quantity of described cuff cloth bag is two.
Preferably, in device at the bottom of above-mentioned expansion, an end of described Grouting Pipe arranges a slurry casting machine with injected hole.
Preferably, in device at the bottom of above-mentioned expansion, described cuff cloth bag is arranged at the middle and upper part of described geotechnological cloth bag.
Preferably, in device at the bottom of above-mentioned expansion, the diameter of described geotechnological cloth bag is than the large 200-300mm of diameter of described reinforcing cage.
Preferably, in device at the bottom of above-mentioned expansion, described Grouting Pipe is iron pipe.
The invention also discloses a kind of injection forming expanded bore pile, it is built and forms by the reinforcing cage of device is installed at the bottom of expansion as described in any one in claim 1~7.
The invention also discloses a kind of job practices of injection forming expanded bore pile, comprise the steps:
Step 1, in the arranged outside of the bottom of reinforcing cage as described in any one in claim 1~7
Expansion at the bottom of device, specifically comprise:
Step 1-1 is sheathed on described geotechnological cloth bag the bottom outside of reinforcing cage and described geotechnological cloth bag
Bottom and the bottom (being the bottom of the bottom of reinforcing cage) of the reinforcing cage distance of reserving 500mm;
Step 1-2 adopts rope 5 that the upper and lower end of described geotechnological cloth bag is solid mutually with the bottom of reinforcing cage
Fixed, the middle part of described geotechnological cloth bag adopts some roads elastic cord to tighten, and makes geotechnological cloth bag and steel
The bottom of muscle cage is closely connected;
Step 2 is transferred the bottom and is put in place with the reinforcing cage that expands end device, and concrete perfusion inward;
Step 3, after concrete curing 6h~7h, beginning slip casting, whole slip casting process is divided and is carried out for 3 times,
Every minor tick 15~20 minutes, the geotechnological cloth bag that expands end device forms full under the filling of cement paste
Cylindrical slip casting bag structure, its diameter squeeze along with the injection of the cement grout expansion of constantly expanding thereupon
Press surrounding concrete and encrypt surrounding soil, the final stake end enlarged footing that forms.
Preferably, in the job practices of above-mentioned injection forming expanded bore pile, described cement paste adopts P42.5 cement.
device at the bottom of injection forming expanded bore pile provided by the invention and job practices and expansion, expand end device by the arranged outside in the bottom of reinforcing cage, the bottom is transferred with the reinforcing cage that expands end device put in place, and concrete perfusion inward, Deng beginning slip casting after concrete curing, the geotechnological cloth bag that expands end device forms full cylindrical slip casting bag structure under the filling of cement paste, its diameter is along with the injection of the cement grout expansion of constantly expanding, push surrounding concrete thereupon and encrypt surrounding soil, the final stake end enlarged footing that forms, the injection forming expanded bore pile has not only embodied the advantage of existing expanded bore pile, also be to be applicable to multiple soil layer regional, be not subjected to the impact of the unfavorable factors such as collapse hole, construction technology is simple simultaneously, need not big machinery formula squeeze equipment, the slip casting good stability, slurries can be controlled, running pulp not, bearing capacity improves obviously, a kind of new and effective, the economic type of stake reliably.
The invention provides a kind of Novel pile type and job practices thereof, adopt existing Post Grouting Technique, utilize simultaneously the boundary constraint of geotechnological cloth bag to control slurries, can regularly flow, both filling the space of stake between soil, by slurries, surrounding soil is produced compacted effect and invigoration effect again, thereby reach the purpose that improves the stake anti-pulling capacity, it is regional that this new stake type goes for multiple soil layer.
Description of drawings
At the bottom of injection forming expanded bore pile of the present invention and job practices and expansion, device is provided by following embodiment and accompanying drawing.
Fig. 1 is the structural representation of device at the bottom of expansion of the present invention;
Fig. 2 is the A-A cross-sectional schematic of Fig. 1;
Fig. 3 A is that the job practices of injection forming expanded bore pile of the present invention is at the step structural representation of injection forming expanded bore pile for the moment;
Fig. 3 B is the schematic top plan view of Fig. 3 A;
Fig. 4 is the structural representation of the injection forming expanded bore pile of job practices when step 2 of injection forming expanded bore pile of the present invention;
Fig. 5 is the structural representation of the injection forming expanded bore pile of job practices when step 3 of injection forming expanded bore pile of the present invention;
In figure, 1-geotechnique cloth bag, 11-internal layer, 12-skin, 2-Grouting Pipe, 3-cuff cloth bag, 4-reinforcing cage, 5-rope, 6-elastic cord, 7-slurry casting machine.
The specific embodiment
Below with reference to accompanying drawings the present invention is described in more detail, has wherein represented the preferred embodiments of the present invention, should be appreciated that those skilled in the art can revise the present invention described here and still realize beneficial effect of the present invention.Therefore, following description is appreciated that extensively knowing for those skilled in the art, and not as limitation of the present invention.
For clear, whole features of practical embodiments are not described.They in the following description, are not described in detail known function and structure, because can make the present invention chaotic due to unnecessary details.Will be understood that in the exploitation of any practical embodiments, must make a large amount of implementation details to realize developer's specific objective, for example according to the restriction of relevant system or relevant business, change into another embodiment by an embodiment.In addition, will be understood that this development may be complicated and time-consuming, but be only routine work to those skilled in the art.
For purpose of the present invention, feature are become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the purpose of the aid illustration embodiment of the present invention lucidly.
See also 1 and Fig. 2, and please in conjunction with Fig. 3 A, the present embodiment provides a kind of injection forming expanded bore pile, it is built and forms by the reinforcing cage that expands end device is installed.device at the bottom of described expansion, the bottom that is arranged at reinforcing cage 4 is the outside of cage at the bottom of reinforcing bar, at the bottom of described expansion, device comprises geotechnological cloth bag 1 and Grouting Pipe 2, described geotechnological cloth bag 1 is sheathed on the bottom outside of reinforcing cage 4, the diameter of described geotechnological cloth bag is than the large 200-300mm of diameter of described reinforcing cage, described geotechnological cloth bag 1 upper, the lower end respectively with the bottom of described reinforcing cage 4 by being iron wire in rope 5(the present embodiment) fix, described geotechnological cloth bag 1 integral body is hollow cylinder, described geotechnological cloth bag 1 is double-decker at least, upper lower sealing and have at least an inner chamber that is used for holding injection slurry, to be described geotechnological cloth bag in the present embodiment sealed by upper and lower port by internal layer 11 and outer 12 connects to form.Tighten with some roads elastic cord 6 middle part of described geotechnological cloth bag 1, in the process of slip casting, because elastic cord 6 is flexible, therefore, geotechnological cloth bag 1 can distending, one end of described Grouting Pipe 2 inserts in described geotechnological cloth bag 1, the external slip casting of the other end of described Grouting Pipe 2 source.
Better, in the present embodiment, cuff cloth bag 3 is offered on the top of described geotechnological cloth bag 1, and the top of described cuff cloth bag 3 has the opening for an end insertion of described Grouting Pipe 2, and the bottom of described cuff cloth bag 3 is communicated with the inner chamber of described geotechnological cloth bag 1.
Better, in the present embodiment, the quantity of described cuff cloth bag 3 is two, so setting can be so that cement paste flows in geotechnological cloth bag 1 more evenly, reposefully.Further preferred, described cuff cloth bag 3 is arranged at the middle and upper part of described geotechnological cloth bag.So arrange and further to make cement paste flow into more evenly, reposefully in geotechnological cloth bag 1.
Better, in the present embodiment, an end of described Grouting Pipe 2 is provided with the slurry casting machine 7 of injected hole, so that cement paste evenly flows in geotechnological cloth bag 1.
Better, in the present embodiment, described Grouting Pipe 2 is iron pipe.
See also Fig. 1 to Fig. 5, the present embodiment has also offered a kind of job practices of injection forming expanded bore pile, comprises the steps:
Step 1, device at the bottom of the arranged outside expansion as above of the bottom of reinforcing cage 4 as shown in Fig. 3 A and Fig. 3 B, specifically comprises:
Step 1-1 is enclosed within described geotechnological cloth bag 1 on the bottom of reinforcing cage 4, and described geotextiles
The distance of 500mm is reserved in the bottom of bag 1 and the bottom of reinforcing cage 4, is beneficial to follow-up concrete casting
Instead starch smoothly when building, take pile bottom sediment out of;
Step 1-2 adopts rope 5 with the end of upper and lower end and the reinforcing cage 4 of described geotechnological cloth bag 1
Section fixes, and the middle part of described geotechnological cloth bag 1 adopts some roads elastic cord 6 to tighten, and makes soil
The bottom of work cloth bag 1 and reinforcing cage 4 is closely connected;
Step 2 is utilized construction process for bored pile that the bottom is transferred with the reinforcing cage 4 that expands end device and is put in place, and concrete perfusion inward, as shown in Figure 4;
Step 3, after concrete curing 6h~7h, beginning slip casting, for preventing that geotechnological cloth bag 1 from being burst, whole slip casting process is divided and is carried out for 3 times, and every minor tick 15~20 minutes is beneficial to the dribbling of grouting pressure in geotechnological cloth bag 1.The geotechnological cloth bag 1 that expands end device forms full cylindrical slip casting bag structure under the filling of cement paste, its diameter is along with the injection of the cement grout expansion of constantly expanding, push surrounding concrete thereupon and encrypt surrounding soil, the final stake end enlarged footing that forms, as shown in Figure 5, thereby increased substantially the native interlocking of stake, improved the bearing capacity of uplift pile.
Preferably, in the job practices of above-mentioned injection forming expanded bore pile, described cement paste adopts P42.5 cement.PO42,5 refer to the Portland cement strength grade, and 28 days compressive strength standard that are exactly Portland cement are not less than 42.5 MPas.
in sum, device at the bottom of injection forming expanded bore pile provided by the invention and job practices and expansion, expand end device by the arranged outside in the bottom of reinforcing cage, the bottom is transferred with the reinforcing cage that expands end device put in place, and concrete perfusion inward, Deng beginning slip casting after concrete curing, the geotechnological cloth bag that expands end device forms full cylindrical slip casting bag structure under the filling of cement paste, its diameter is along with the injection of the cement grout expansion of constantly expanding, push surrounding concrete thereupon and encrypt surrounding soil, the final stake end enlarged footing that forms, the injection forming expanded bore pile has not only embodied the advantage of existing expanded bore pile, also be to be applicable to multiple soil layer regional, be not subjected to the impact of the unfavorable factors such as collapse hole, construction technology is simple simultaneously, need not big machinery formula squeeze equipment, the slip casting good stability, slurries can be controlled, running pulp not, bearing capacity improves obviously, a kind of new and effective, the economic type of stake reliably.
The invention provides a kind of Novel pile type and job practices thereof, adopt existing Post Grouting Technique, utilize simultaneously the boundary constraint of geotechnological cloth bag to control slurries, can regularly flow, both filling the space of stake between soil, by slurries, surrounding soil is produced compacted effect and invigoration effect again, thereby reach the purpose that improves the stake anti-pulling capacity, it is regional that this new stake type goes for multiple soil layer.
Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of claim of the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.

Claims (10)

1. one kind is expanded end device, it is characterized in that, comprise geotechnological cloth bag and Grouting Pipe, described geotechnological cloth bag is sheathed on the bottom outside of reinforcing cage, the upper and lower end of described geotechnological cloth bag fixes with the bottom of described reinforcing cage respectively, tighten with some roads elastic cord the middle part of described geotechnological cloth bag, described geotechnological cloth bag integral body is hollow cylinder, described geotechnological cloth bag is double-decker, upper lower sealing at least and has at least one for the inner chamber that holds injection slurry, one end of described Grouting Pipe is connected with described geotechnological cloth bag, the external slip casting of the other end of described Grouting Pipe source.
2. device at the bottom of expansion according to claim 1, it is characterized in that, the cuff cloth bag is offered on the top of described geotechnological cloth bag, and the top of described cuff cloth bag has the opening for an end insertion of described Grouting Pipe, and the bottom of described cuff cloth bag is communicated with the inner chamber of described geotechnological cloth bag.
3. device at the bottom of expansion according to claim 2, is characterized in that, the quantity of described cuff cloth bag is two.
4. device at the bottom of expansion according to claim 2, is characterized in that, an end of described Grouting Pipe arranges a slurry casting machine with injected hole.
5. device at the bottom of expansion according to claim 2, is characterized in that, described cuff cloth bag is arranged at the middle and upper part of described geotechnological cloth bag.
6. device at the bottom of expansion according to claim 1, is characterized in that, the diameter of described geotechnological cloth bag is than the large 200-300mm of diameter of described reinforcing cage.
7. device at the bottom of expansion according to claim 1, is characterized in that, described Grouting Pipe is iron pipe.
8. an injection forming expanded bore pile, is characterized in that, it is built and form by the reinforcing cage of device is installed at the bottom of expansion as described in any one in claim 1~7.
9. the job practices of an injection forming expanded bore pile, is characterized in that, comprises the steps:
Step 1, the arranged outside of the bottom of reinforcing cage as any one in claim 1~7 device at the bottom of described expansion, specifically comprise:
Step 1-1 is sheathed on described geotechnological cloth bag the bottom outside of reinforcing cage, and the distance of 500mm is reserved in the bottom of the bottom of described geotechnological cloth bag and reinforcing cage;
Step 1-2 adopts rope that the upper and lower end of described geotechnological cloth bag and the bottom of reinforcing cage are fixed, and the middle part of described geotechnological cloth bag adopts some roads elastic cord to tighten, and makes the bottom of geotechnological cloth bag and reinforcing cage closely connected;
Step 2 is transferred the bottom and is put in place with the reinforcing cage that expands end device, and concrete perfusion inward;
Step 3, after concrete curing 6h~7h, beginning slip casting, whole slip casting process is divided and is carried out for 3 times, every minor tick 15~20 minutes, the geotechnological cloth bag that expands end device forms full cylindrical slip casting bag structure under the filling of cement paste, and its diameter is along with the injection of the cement grout expansion of constantly expanding, push surrounding concrete thereupon and encrypt surrounding soil, the final stake end enlarged footing that forms.
10. the job practices of injection forming expanded bore pile according to claim 9, is characterized in that, cement paste adopts P42.5 cement.
CN201310048265.4A 2013-02-06 2013-02-06 Grouting molding pedestal pile and construction method thereof and pedestal expanding device Active CN103114578B (en)

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CN103114578B CN103114578B (en) 2015-07-01

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103711122A (en) * 2013-12-09 2014-04-09 杭州江润科技有限公司 Cloth bag squeezing concrete branch pile and construction method
CN104213554A (en) * 2014-08-15 2014-12-17 上海市建工设计研究院有限公司 Construction method of slip-casting variable-cross section steel pipe pile and expansion and extrusion device of slip-casting variable-cross section steel pipe pile
CN107034877A (en) * 2017-05-17 2017-08-11 东南大学 Pile end stake side combination post jacking device and its construction method
CN107059849A (en) * 2017-04-28 2017-08-18 安徽理工大学 A kind of driven cast-in-place pile and its construction technology
CN109763772A (en) * 2019-01-12 2019-05-17 东北电力大学 A kind of portable hydraulic base expanding and base expanding device for base expanding and base expanding pile foundation construction

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Publication number Priority date Publication date Assignee Title
JPH0711638A (en) * 1993-06-23 1995-01-13 Asahi Chem Ind Co Ltd Pile provided with bag
JPH08239833A (en) * 1995-03-01 1996-09-17 Asahi Chem Ind Co Ltd Pile with bag body
CN1226491C (en) * 2003-10-30 2005-11-09 北京城建集团有限责任公司 Post mudjack construction technics for sidewal and bottom of bore of filling pile
CN102605773A (en) * 2012-04-16 2012-07-25 上海市建工设计研究院有限公司 Construction method of slip-casting expanded-base cast-in-situ bored pile and extruding-extending device thereof
CN203129129U (en) * 2013-02-06 2013-08-14 上海市建工设计研究院有限公司 Slip casting expanded bottom pile and bottom-expanding device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0711638A (en) * 1993-06-23 1995-01-13 Asahi Chem Ind Co Ltd Pile provided with bag
JPH08239833A (en) * 1995-03-01 1996-09-17 Asahi Chem Ind Co Ltd Pile with bag body
CN1226491C (en) * 2003-10-30 2005-11-09 北京城建集团有限责任公司 Post mudjack construction technics for sidewal and bottom of bore of filling pile
CN102605773A (en) * 2012-04-16 2012-07-25 上海市建工设计研究院有限公司 Construction method of slip-casting expanded-base cast-in-situ bored pile and extruding-extending device thereof
CN203129129U (en) * 2013-02-06 2013-08-14 上海市建工设计研究院有限公司 Slip casting expanded bottom pile and bottom-expanding device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103711122A (en) * 2013-12-09 2014-04-09 杭州江润科技有限公司 Cloth bag squeezing concrete branch pile and construction method
CN104213554A (en) * 2014-08-15 2014-12-17 上海市建工设计研究院有限公司 Construction method of slip-casting variable-cross section steel pipe pile and expansion and extrusion device of slip-casting variable-cross section steel pipe pile
CN107059849A (en) * 2017-04-28 2017-08-18 安徽理工大学 A kind of driven cast-in-place pile and its construction technology
CN107034877A (en) * 2017-05-17 2017-08-11 东南大学 Pile end stake side combination post jacking device and its construction method
CN107034877B (en) * 2017-05-17 2019-06-18 东南大学 Combine post jacking device and its construction method in pile end stake side
CN109763772A (en) * 2019-01-12 2019-05-17 东北电力大学 A kind of portable hydraulic base expanding and base expanding device for base expanding and base expanding pile foundation construction
CN109763772B (en) * 2019-01-12 2020-04-03 东北电力大学 Portable hydraulic bottom expanding device for foundation construction of bottom expanding pile

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