CN104727315B - Post-grouting prestressed concrete hollow pile and manufacturing method thereof - Google Patents
Post-grouting prestressed concrete hollow pile and manufacturing method thereof Download PDFInfo
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- CN104727315B CN104727315B CN201510135370.0A CN201510135370A CN104727315B CN 104727315 B CN104727315 B CN 104727315B CN 201510135370 A CN201510135370 A CN 201510135370A CN 104727315 B CN104727315 B CN 104727315B
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Abstract
The invention relates to a post-grouting prestressed concrete hollow pile and the manufacturing method thereof. The hollow pile comprises multiple hollow pile units, a post-grouting pile tip and a pile butt grouting pipe connecting piece, wherein each hollow pile unit comprises a lower end plate, an upper end plate, a post-grouting lower connecting piece, a post-grouting upper connecting piece, a grouting pipe, a sealing washer and sealing cement. On the premise that the traditional pile foundation production and construction technology is only changed slightly, the advantages of prestressed hollow piles and the advantages of the post-grouting technology are combined effectively, original production equipment and construction equipment are fully utilized, investment is reduced, the bearing capacity of a single pile can be improved greatly, soil compaction effect is reduced, and construction efficiency is improved.
Description
Technical field
The present invention relates to a kind of grouting behind shaft or drift lining prestressing concrete hollow pile and preparation method thereof, belongs to pre-stress hollow stake life
Produce and construction field.
Background technology
Pre-stress hollow stake has mechanized construction degree in building site high, and speed of application is fast, and scene is clean and tidy, can avoid generation
The soiled condition that cast-in-situ bored pile building site mud completely flows, is also not in that artificial digging pile building site is drawn water everywhere and mound muck haulage
Busy scene, the advantages of pile strength is high.But because pre-stress hollow stake pile body is smooth, stake end diameter is less etc., and factor is caused
Stake is less with native frictional resistance, the unfavorable factor such as bearing capacity of pile tip is limited.Often so that its higher pile strength cannot fill
Divide and utilize, so as to increase pile foundation quantity, certain waste is caused in engineering.Increasing piling quantity simultaneously can strengthen soil compaction effect again
Should, cause the adverse effect to piling construction and periphery construction of structures.
Post Grouting Technique can greatly improve the bearing capacity of pile foundation, and according to data Post Grouting Technique is carried to pile body frictional resistance
High-amplitude is about 1.2～1.8 times, and to stake end end resistance increase rate 2～4 times are about.Post Grouting Technique is suitable for almost various
Geology soil layer and strong, middle weathered rock formation, the scope of application is widely.In filling pile construction, Post Grouting Technique has been obtained for
It is widely applied, technology maturation reliability, remarkable in economical benefits.But not yet it is promoted in pre-stress hollow stake and applies, greatly
The utilization of Post Grouting Technique is limited greatly.
The content of the invention
For the defect that prior art is present, it is an object of the invention to provide a kind of grouting behind shaft or drift lining prestressing concrete hollow pile
And preparation method thereof, the stake of pre-stress hollow stake can be effectively improved in the construction that Post Grouting Technique is applied to pre-stress hollow stake
Body frictional resistance and end resistance, the pile strength for making pre-stress hollow stake is fully utilized, and reaches saving construction costs, reduces
The effect of the unfavorable factor produced in pre-stress hollow pile driving construction.
To reach above-mentioned purpose, the present invention adopts following technical proposals：
A kind of grouting behind shaft or drift lining prestressing concrete hollow pile, including several hollow pile elements, grouting behind shaft or drift lining pile top, stake top slip casting
Pipe connections；Each hollow pile element includes connector, grouting behind shaft or drift lining upper connector, slip casting under bottom plate, upper head plate, grouting behind shaft or drift lining
Pipe, seal washer and sealing cement；The bottom plate is fixed on the bottom of hollow pile element pile body, connector under the grouting behind shaft or drift lining
In the centre bore of bottom plate, and sealed by seal washer and sealing cement, symmetrically fixed on the side wall of bottom plate
The pile body external communication of two pile body grouting valves and hollow pile element；The upper head plate is fixed on the top of hollow pile element pile body
Portion, the central hole of upper head plate is provided with Grouting Pipe conduit, and the grouting behind shaft or drift lining upper connector is arranged in the centre bore of upper head plate, and
Sealed by seal washer and sealing cement, described Grouting Pipe one end is fixed with grouting behind shaft or drift lining upper connector, after the other end is fixed on
Under slip casting on connector, between the Grouting Pipe and two connectors produce a pretension so that two connectors with it is upper and lower
End plate holds out against respectively, with better seal；The bottom of the bottom plate is provided with sealing flange, and the top of the upper head plate is provided with right
The sealed groove answered, when the hollow pile element of each two carries out pile extension, sealing flange is snapped in sealed groove and sealed, at two
Peviform or the infundibulate slip casting space of an indent are formed between hollow pile element；It is empty that the grouting behind shaft or drift lining pile top is fixed on lowermost end
The bottom of heart pile element, is provided with pile end grouting valve in grouting behind shaft or drift lining pile top；Connect on the upper head plate of the hollow pile element of top
Stake top slip casting pipe connections, the stake top slip casting pipe connections connection outside Grouting Pipe；Set on the stake top slip casting pipe connections
Putting check-valves prevents slurry reflux.
A kind of manufacture method of grouting behind shaft or drift lining prestressing concrete hollow pile, has steps of：
1）Making of reinforcement cage, framework of steel reinforcement enters mould：According to prestressing concrete hollow pile structural reinforcement design requirement, adopt
Framework of steel reinforcement is made with special framework of steel reinforcement automatic welding machine.By the framework of steel reinforcement made, bottom plate and upper head plate placement
In prestressing concrete hollow pile lower half punching block, and with deformed bar anchor plate, stretch board, tension rod connection.
2）Grouting Pipe is installed：Connector under grouting behind shaft or drift lining and Grouting Pipe are tightened, before pre-stress hollow stake casting concrete,
During Grouting Pipe to be inserted the centre bore of bottom plate and the Grouting Pipe conduit of upper head plate.
3）Concrete feeding, matched moulds：By the consumption requirement for often saving prestressing concrete hollow pile, by fresh concrete along mould
Tool uniformly inserts female die, then upper mold section is hung to into female die top, and blending bolt fixes upper and lower two-half die.To guarantee mould
Tool does not loosen and concrete not running pulp in high speed centrifugation operation process.
4）Prestressed stretch-draw, centrifugal forming：Entirety is carried out to the framework of steel reinforcement after matched moulds using the stretching machine of jack type
Tensioning, after being stretched to the 70% of reinforced steel bar strength, is fixed on tension rod in steel mold with big nut.By the band mould after stretch-draw anchor
Tool prestressing concrete hollow pile is hung on centrifuge, is accelerated step by step by the centrifugal speed of initial velocity, middling speed, high speed, makes concrete
Closely knit molding is centrifuged.The centrifugal operation time, general control was between 10 ~ 20 minutes.
5）Steam curing, the demoulding：The band mould prestressing concrete hollow pile of centrifugal forming is hung to into atmospheric steam curing
Interior, stands 1 ~ 2 hour, is to slowly warm up to 90 DEG C ~ 100 DEG C, conserves 4 ~ 8 hours under normal pressure, makes concrete strength reach 40MPa
More than, then it is hung on special stripping station position, tensioning bolt and die bolt are shed with spanner, upper mold section is hung away, stir
Female die, sheds prestressing force and widens screw rod, hangs away female die.
6）Grouting behind shaft or drift lining upper connector is installed：Prestressing concrete hollow pile after the demoulding is hung to into grouting behind shaft or drift lining upper connector behaviour
Make platform, grouting behind shaft or drift lining upper connector and Grouting Pipe are tightened, produce a pretension, make the connector and upper and lower side at Grouting Pipe two ends
Plate holds out against respectively, to reach the effect of sealing.For the stake that concrete design strength grade is not higher than C60 can directly be hung to into
Product storehouse pile, natural curing is dispatched from the factory by reaching after design strength.Stake of the concrete design strength grade higher than more than C60, needs
Hang in again and carry out in autoclave high temperature steam curing, maximum temperature is 180 DEG C ~ 200 DEG C, and saturated vapour pressure is 1.0MPa, support
The shield time is 4 ~ 8 hours, and concrete strength is reached after design strength can directly dispatch from the factory.
7）Hollow pile element is transported to into job site, lowermost end hollow pile element solder grouting behind shaft or drift lining pile top carries out pile sinking；Treat
When the hollow pile element pile sinking of lower section is to Near Ground, the hollow pile element of upper section is hung into stake in place, carry out pile extension, it is close after the completion of pile extension
Envelope flange is snapped in sealed groove and sealed, it is ensured that Grouting Pipe is unimpeded；When the hollow pile element piling of top is to Near Ground,
First connect stake top slip casting pipe connections, and connect outside Grouting Pipe, then pile follower is carried out using Pile feeder, by prestressed concrete
Hollow pile delivers to predetermined absolute altitude, and now the Grouting Pipe after spreading can just basset, convenient connection outside grouting equipment.
The present invention compared with prior art, with following obviously substantive distinguishing features and advantage：
Grouting Pipe of the present invention affects less, using traditional work using being mechanically connected on the production technology of Traditional project stake
Journey stake production equipment may be used for the production of Novel engineering pile, reduce the input cost at project initial stage.Only in advance should to traditional
The end plate and pile top of power hollow pile carry out the modification of very little, do not change the structure design of pile body, do not affect the intensity of pile body, can be with
It is that the design and popularization of novel tubular pile all brings very big directly using the atlas of traditional pre-stress hollow stake, design parameter etc.
It is convenient.Post Grouting Technique is applied in pre-stress hollow stake, bearing capacity of single pile 40% ~ 100% can be improved, pre-stress hollow is made
The pile strength of stake is not fully exerted；Pile foundation density is reduced, reduces soil compaction effect, reduced to piling construction and periphery construction
Build the adverse effect of thing.
The present invention effectively will be answered in advance in the case where only producing to traditional pile foundation and construction technology making the modification of very little
The advantage of power hollow pile and Post Grouting Technique combines.Both original production equipment and construction equipment had been made full use of, throwing had been reduced
Enter cost, bearing capacity of single pile can be greatly improved again, reduce soil compaction effect, improve efficiency of construction.
Description of the drawings
The structural representation of Fig. 1 grouting behind shaft or drift lining prestressing concrete hollow piles.
Fig. 2 grouting behind shaft or drift lining prestressing concrete hollow pile end plate detail drawings.
Fig. 3 slip casting pipe connections detail drawings.
Fig. 4 stake top slip casting pipe connections detail drawings.
Fig. 5 grouting behind shaft or drift lining pile top detail drawings.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the present invention is described further.
As shown in Figures 1 to 5, a kind of grouting behind shaft or drift lining prestressing concrete hollow pile, including several hollow pile elements, note afterwards
Slurry pile top 6, stake top slip casting pipe connections 14；Each hollow pile element include bottom plate 1, upper head plate 2, grouting behind shaft or drift lining under connector 3,
Grouting behind shaft or drift lining upper connector 4, Grouting Pipe 5, seal washer and sealing cement 8；The bottom plate 1 is fixed on hollow pile element pile body
Bottom, connector 3 is arranged in the centre bore of bottom plate 1 under the grouting behind shaft or drift lining, and close by seal washer and sealing cement 8
Envelope, symmetrically fixes the pile body external communication of two pile body grouting valves 7 and hollow pile element on the side wall of bottom plate 1；On described
End plate 2 is fixed on the top of hollow pile element pile body, and the central hole of upper head plate 2 is provided with Grouting Pipe conduit 11, the grouting behind shaft or drift lining
Upper connector 4 is arranged in the centre bore of upper head plate 2, and is sealed by seal washer and sealing cement 8, the Grouting Pipe 5 one
End is fixed with grouting behind shaft or drift lining upper connector 4, and the other end is fixed under grouting behind shaft or drift lining on connector 3, the Grouting Pipe 5 and two connectors
Between produce a pretension so that two connectors hold out against respectively with upper and lower end plate, with better seal；The bottom plate 1
Bottom be provided with sealing flange 9, the top of the upper head plate 2 is provided with corresponding sealed groove 10, and the hollow pile element of each two enters
During row pile extension, sealing flange 9 is snapped in and sealed in sealed groove 10, one indent of formation between two hollow pile elements
Peviform or infundibulate slip casting space；The grouting behind shaft or drift lining pile top 6 is fixed on the bottom of the hollow pile element of lowermost end, in grouting behind shaft or drift lining pile top
Pile end grouting valve 13 is provided with 6；Connect stake top slip casting pipe connections 14 on the upper head plate 2 of the hollow pile element of top, it is described
Stake top slip casting pipe connections 14 connect outside Grouting Pipe 15；Check-valves 12 are arranged on the stake top slip casting pipe connections 14 prevents slurry
Liquid flows back.
A kind of manufacture method of grouting behind shaft or drift lining prestressing concrete hollow pile, has steps of：
1）Making of reinforcement cage, framework of steel reinforcement enters mould：According to prestressing concrete hollow pile structural reinforcement design requirement, adopt
Framework of steel reinforcement is made with special framework of steel reinforcement automatic welding machine.By the framework of steel reinforcement made, bottom plate 1 and upper head plate 2 are put
Be placed in prestressing concrete hollow pile lower half punching block, and with deformed bar anchor plate, stretch board, tension rod connection；
2）Grouting Pipe 5 is installed：Connector under grouting behind shaft or drift lining 3 is tightened with Grouting Pipe 5, in pre-stress hollow stake casting concrete
Before, during Grouting Pipe 5 to be inserted the centre bore of bottom plate 1 and the Grouting Pipe conduit 11 of upper head plate 2；
3）Concrete feeding, matched moulds：By the consumption requirement for often saving prestressing concrete hollow pile, by fresh concrete along mould
Tool uniformly inserts female die, then upper mold section is hung to into female die top, and blending bolt fixes upper and lower two-half die.To guarantee mould
Tool does not loosen and concrete not running pulp in high speed centrifugation operation process；
4）Prestressed stretch-draw, centrifugal forming：Entirety is carried out to the framework of steel reinforcement after matched moulds using the stretching machine of jack type
Tensioning, after being stretched to the 70% of reinforced steel bar strength, is fixed on tension rod in steel mold with big nut.By the band mould after stretch-draw anchor
Tool prestressing concrete hollow pile is hung on centrifuge, is accelerated step by step by the centrifugal speed of initial velocity, middling speed, high speed, makes concrete
Closely knit molding is centrifuged.The centrifugal operation time, general control was between 10 ~ 20 minutes；
5）Steam curing, the demoulding：The band mould prestressing concrete hollow pile of centrifugal forming is hung to into atmospheric steam curing
Interior, stands 1 ~ 2 hour, is to slowly warm up to 90 DEG C ~ 100 DEG C, conserves 4 ~ 8 hours under normal pressure, makes concrete strength reach 40MPa
More than, then it is hung on special stripping station position, tensioning bolt and die bolt are shed with spanner, upper mold section is hung away, stir
Female die, sheds prestressing force and widens screw rod, hangs away female die；
6）Grouting behind shaft or drift lining upper connector 4 is installed：Prestressing concrete hollow pile after the demoulding is hung to into grouting behind shaft or drift lining upper connector
Operating board, grouting behind shaft or drift lining upper connector 4 is tightened with Grouting Pipe 5, produces a pretension, make the connector at the two ends of Grouting Pipe 5 with
Up and down end plate holds out against respectively, to reach the effect of sealing.Can be direct for the stake that concrete design strength grade is not higher than C60
Warehouse for finished product pile is hung to, natural curing is dispatched from the factory by reaching after design strength.Concrete design strength grade is higher than more than C60
Stake, need to hang in again in autoclave carries out high temperature steam curing, and maximum temperature is 180 DEG C ~ 200 DEG C, and saturated vapour pressure is
1.0MPa, curing time is 4 ~ 8 hours, and concrete strength is reached after design strength can directly dispatch from the factory；
7）Hollow pile element is transported to into job site, lowermost end hollow pile element solder grouting behind shaft or drift lining pile top 6 carries out pile sinking；
When the hollow pile element pile sinking of lower section is to Near Ground, the hollow pile element of upper section is hung into stake in place, pile extension is carried out, after the completion of pile extension
Sealing flange 9 is snapped in and sealed in sealed groove 10, it is ensured that Grouting Pipe is unimpeded；The hollow pile element piling of top is attached to ground
When near, first connect stake top slip casting pipe connections 14, and connect outside Grouting Pipe 15, then pile follower is carried out using Pile feeder, will be pre-
Prestressed concrete hollow pile delivers to predetermined absolute altitude, and now the Grouting Pipe after spreading can just basset, and convenient connection is outside to note
Slurry equipment.
Claims (1)
1. a kind of grouting behind shaft or drift lining prestressing concrete hollow pile, it is characterised in that including several hollow pile elements, grouting behind shaft or drift lining pile top
（6）, stake top slip casting pipe connections（14）；Each hollow pile element includes bottom plate（1）, upper head plate（2）, connector under grouting behind shaft or drift lining
（3）, grouting behind shaft or drift lining upper connector（4）, Grouting Pipe（5）, seal washer and sealing cement（8）；The bottom plate（1）It is fixed on hollow
The bottom of pile element pile body, connector under the grouting behind shaft or drift lining（3）Installed in bottom plate（1）Centre bore in, and by sealing gasket
Circle and sealing cement（8）Sealing, in bottom plate（1）Side wall on symmetrically fix two pile body grouting valves（7）With hollow pile element
Pile body external communication；The upper head plate（2）It is fixed on the top of hollow pile element pile body, upper head plate（2）Central hole set
There is Grouting Pipe conduit（11）, the grouting behind shaft or drift lining upper connector（4）Installed in upper head plate（2）Centre bore in, and by sealing gasket
Circle and sealing cement（8）Sealing, the Grouting Pipe（5）One end and grouting behind shaft or drift lining upper connector（4）Fixed, the other end is noted after being fixed on
The lower connector of slurry（3）On, the Grouting Pipe（5）A pretension is produced between two connectors so that two connectors with
Up and down end plate holds out against respectively, with better seal；The bottom plate（1）Bottom be provided with sealing flange（9）, the upper head plate
（2）Top be provided with corresponding sealed groove（10）, when the hollow pile element of each two carries out pile extension, sealing flange（9）Snap in close
Envelope groove（10）In sealed, between two hollow pile elements formed an indent peviform or infundibulate slip casting space；
The grouting behind shaft or drift lining pile top（6）The bottom of the hollow pile element of lowermost end is fixed on, in grouting behind shaft or drift lining pile top（6）On be provided with pile end grouting valve
（13）；The upper head plate of the hollow pile element of top（2）Upper connection stake top slip casting pipe connections（14）, the stake top Grouting Pipe company
Fitting（14）The outside Grouting Pipe of connection（15）；The stake top slip casting pipe connections（14）Upper setting check-valves（12）Prevent serosity from returning
Stream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510135370.0A CN104727315B (en) | 2015-03-26 | 2015-03-26 | Post-grouting prestressed concrete hollow pile and manufacturing method thereof |
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| CN104727315B true CN104727315B (en) | 2017-04-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237329B (en) * | 2017-06-12 | 2020-01-24 | 武汉大学 | Grouting device and grouting method |
| CN107905223B (en) * | 2017-11-16 | 2019-07-09 | 中铁十六局集团第三工程有限公司 | A kind of tubular pole pile top with slip casting function |
| CN113622418A (en) * | 2021-08-10 | 2021-11-09 | 上海市机械施工集团有限公司 | Prestressed concrete pipe pile structure and construction method |
| CN114277834B (en) * | 2022-01-06 | 2022-09-23 | 江苏科技大学 | Wind power single pile foundation and construction method |
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