CN102605767A - Precast pile reserved with grouting pipe and piling process of precast pile - Google Patents
Precast pile reserved with grouting pipe and piling process of precast pile Download PDFInfo
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- CN102605767A CN102605767A CN2012100832649A CN201210083264A CN102605767A CN 102605767 A CN102605767 A CN 102605767A CN 2012100832649 A CN2012100832649 A CN 2012100832649A CN 201210083264 A CN201210083264 A CN 201210083264A CN 102605767 A CN102605767 A CN 102605767A
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Abstract
The invention discloses a precast pile reserved with a grouting pipe, which comprises a pile body, wherein the bottom of the pile body is fixedly connected with a pile head, a pile-side grouting pipe and a pile-end grouting pipe are arranged in the pile body; the pile-end grouting pipe is positioned at the center of the pile body, a pile-side one-way grout outlet is prearranged on a separation section of the pile-side grouting pipe, the lower end of the pile-end grouting pipe is communicated with an outlet of the lower end of the pile body, a pile-side connecting pipe is arranged at the upper end of the pipe-side grouting tube, a pile-end connecting pipe is arranged at the upper end of the pile-end grouting pipe, and the pile-side connecting pipe and the pile-end connecting pipe are connected with the upper end surface of the pile body. The invention also provides a piling process of the precast pile. According to the precast pile reserved with the grouting pipe and the piling process of the precast pile, the pile-side friction force and the pile-end bearing capability are improved effectively, and the cost is reduced.
Description
Technical field
The present invention relates to a kind of preformed pile and pile-formation process thereof.
Background technology
Along with the pile foundation of greatly developing of China's construction business becomes especially a kind of deep foundation form of extensively adopting such as highrise building, heavy factory building, subway station of various buildings.Criteria for classification pile foundation according to different can be divided into different types, can be divided into by piling method: preformed pile (timber, piling bar, concrete pile), castinplace pile (tube-sinking cast-in-situ pile, bored pile, hollow out castinplace pile), agitation pile etc. on the spot.From economy, environmental protection, safe equal angles, the use of concrete precast pile and castinplace pile is quite general.For adopting construction of prefabricated piles to have remarkable advantages under the situation peremptorily in the soft soil layer of covering layer, many soil layer and durations of underground water; But cause the long curtailment of single-unit stake owing to hang the restriction of an equipment; The pile extension position can become plane of weakness again, and the pile body crack can reduce that pile strength, bearing capacity of pile tip are not high, pile side friction is little behind the pile sinking.For bored pile, though be applicable to that complicated soil layer pile quality is wayward, problems such as broken pile, dew muscle, folder mud appear easily, cause bearing capacity of single pile not high.Post grouting process develops to some extent and has obtained using widely in recent years, the unobstructed difficult assurance of injected hole when still in bored pile, adopting post grouting process; For the PHC pile tube; Because tube wall is too thin, horizontal bearing capacity is low, and the post grouting process of introducing thus can increase to the horizontal bearing capacity of pile tube; Be difficult to control but when the slip casting simultaneously of stake side at the bottom of the stake, face a side slip casting again, pile grouting needs problems such as the keyhole degree of depth.If can develop and a kind ofly have the new technology that preformed pile and grouting behind shaft or drift lining combine concurrently and will solve a lot of problems for the construction of pile foundation, reservation Grouting Pipe preformed pile is the enforcement of this thinking according to the problems referred to above.
Summary of the invention
In order to overcome the stake deficiency that side-friction force is less, bearing capacity of pile tip is less, cost is higher of existing preformed pile and pile-formation process thereof, the present invention provides a kind of effective reservation Grouting Pipe preformed pile and pile-formation process thereof that improves stake side-friction force and bearing capacity of pile tip, reduces cost.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of reservation Grouting Pipe preformed pile comprises pile body, and said pile body bottom is fixedly connected with pile crown, establishes a side Grouting Pipe and pile end grouting pipe in the said pile body; Said pile end grouting pipe is positioned at the center of pile body, the unidirectional grout outlet of said stake side Grouting Pipe compartment preset stake side, and the lower end of pile end grouting pipe is communicated with the outlet of said pile body lower end; Stake side tube connector is installed in the upper end of said stake side Grouting Pipe, and stake end tube connector is installed in the upper end of said pile end grouting pipe, and said stake side tube connector all is connected with the upper surface of pile body with stake end tube connector.
Further, said pile crown comprises conical head and cylinder body portion, and said cylinder body portion is cage shape or netted.
Further, cross is installed in the lower end of pile end grouting pipe.
Further again, fill rubble in the said pile crown.
Said pile body has at least two sections, leans on the lower end outlet of last pile body to connect with the upper surface that abuts pile body down mutually, and two side Grouting Pipe connections in the neighbouring pile body, the connection of two pile end Grouting Pipe.
Said stake side Grouting Pipe and pile end grouting pipe are bellows.
A kind of pile-formation process of reserving the Grouting Pipe preformed pile, said pile-formation process may further comprise the steps:
(1), arrange template and reinforcing bar, the pile end grouting pipe is located at the pile body center, stake side Grouting Pipe is arranged in the stake side of pile body,
(2) with the pile body of pre-tensioning system processing prestressed pile;
(3) piling and stake delivered to design elevation after begin slip casting;
(4) adopt tube connector that the Grouting Pipe joint is communicated with stake side Grouting Pipe and pile end grouting pipe respectively;
(5) with water under high pressure mediation stake side Grouting Pipe and pile end grouting pipe, open grout outlet;
(6) carry out a side slip casting earlier, carry out pile end grouting again, form preformed pile.
Further, in the said step (1), the main body of stake side Grouting Pipe and pile end grouting pipe all adopts plastic film capicitor, and the termination tube connector is the steel pipe that has internal thread.
Further again, in the said step (1), built-in fitting is set up at the two ends of pile body; In the said step (2), with the built-in fitting butt welding of two sections neighbouring pile bodies.
In the said step (1), template is being had the hole that cooperates with the unidirectional grout outlet of stake side.
Technical conceive of the present invention is: the plastic film capicitor of use has good bending property on the one hand; On the other hand prestressing force apply finish can coordinate pile body when blocking prestressed reinforcement distortion again can with closely interlock of pile body; Secondly plastic film capicitor is cheap can practice thrift construction costs, and this is designed with very big advantage the factor of comprehensive each side.
When stake side slurries inject; At first stake side mud skin is destroyed, eliminates, all soil of stake is played infiltration and compacted effect, a filling stake and a gap of side surrounding soil; Increase along with grouting amount and grouting pressure; On-the-spot retaining wall mud skin is destroyed and extrudes the face of land under the roof pressure of high pressure slurries, filling, squeezing action, enlarge the close district of a stake side pressure scope gradually, makes a stress path of side soil and concretion state change.When the stake side forms fracture grouting when being poor permeability such as cohesive soil or slity soil native,, form the close slip casting state of stake side pressure if a stake side is a permeance property such as gravel property preferably during soil layer.Stake rear flank mud jacking makes between cement paste and stake side mud skin, the soil layer processes such as generation is compacted, infiltration, filling, splitting; The intensity of the stake side soil body and the adhesion stress between the stake side concrete and the soil body have been improved; And increased the stake footpath, improved pile side friction, thereby improved bearing capacity of single pile.
During pile end grouting; Because the existence of rubble in the prefabricated pile crown; Can prevent the good pulp passage of the stake end blocked formation of grout outlet on the one hand, slip casting end rear slurry combines to form the bigger concrete of anti-pressure ability with the reinforcing bar that rubble, stake end stretch out on the other hand.And along with the increase of grouting amount, a stake end, forms " pyriform head " densification zone gradually and also enlarges gradually, and the effect that the final stake end can produce expanded bore pile also can improve bearing capacity of single pile widely.
It is the situation that traditional preformed piles such as soft soil horizon, underflow is big, the duration is more urgent are suitable for that the present invention is suitable for overburden layer.In addition, the present invention has combined the advantage of traditional preformed pile, pile for prestressed pipe, bored pile post grouting process, than traditional preformed pile higher bearing capacity and extraction-resistant behavior is arranged.
Beneficial effect of the present invention mainly shows: the lower-prestressed that (1) pile body reinforcing bar is applied can alleviate the crack of hanging stake, the appearance of piling process effectively, can guarantee pile quality.(2) Grouting Pipe is arranged more rationally, is difficult for blockedly, improves efficiency of construction.(3) can remedy the pile extension defective through grouting process, and occur under the situation in crack at pile body, back mud jacking can be filled in the crack, reaches the effect of repairing pile body.(4) side-friction force and bearing capacity of pile tip are improved greatly, and then can reduce piling quantity, practice thrift cost.(5) when design, just consider grouting behind shaft or drift lining,, also reached the purpose of economical and efficient than grouting behind shaft or drift lining is saved manpower and financial resources as remedial measure.(5) technology is simple, and can guarantee under the prerequisite of bearing capacity of pile the reduction of erection time widely.(6) the pile crown filler can be used slag, building debris, can waste product be utilized again energy-conserving and environment-protective.
The present invention has These characteristics simultaneously, thereby the supporting capacity that has significantly improved stake reduces engineering cost simultaneously, can be the pile foundation engineering service effectively.
Description of drawings
Fig. 1 reserves Grouting Pipe preformed pile pile body structural representation.
Fig. 2 reserves Grouting Pipe preformed pile A-A cross-sectional view.
Fig. 3 reserves Grouting Pipe preformed pile linkage section pile body A-A structural representation.
Fig. 4 reserves Grouting Pipe preformed pile B-B cross section structure sketch map.
Fig. 5 is the pile crown structural representation.
Fig. 6 is the sketch map of pile extension jig.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 4, a kind of reservation Grouting Pipe preformed pile adopts preformed pile to combine with post grouting process, pile body employing lower-prestressed concrete, in establish a side Grouting Pipe 5, pile end grouting pipe 7; Pile crown 10 is prefabricated, fills rubble 9 in the pile crown, and pile crown and stake end are welded into integral body.The unidirectional grout outlet 6 of stake side Grouting Pipe compartment preset stake side, stake end are provided with cross 8 a conducts end grout outlet that are connected with the pile end grouting pipe, guarantee three grout outlets evenly distribute (at be projected as 120 ° of horizontal plane) as far as possible
Above-mentioned prefabricated pile crown 10 is the integral body of similar " yurt " shape, and wherein column part (below stake end join domain) is a cage shape or netted.
Above-mentioned rubble 9 also can be replaced by gravel, slag, building fragment.
With reference to Fig. 1～Fig. 6, a kind of pile-formation process of reserving the Grouting Pipe preformed pile comprises the steps:
(1) arrange template, reinforcing bar and stake side Grouting Pipe 5, pile end grouting pipe 7 and following end built-in fitting 11 and go up stake and hold a built-in fitting 13, pile grouting pipe 7 is located at the center, and a side Grouting Pipe 5 is arranged in a side; The main body of Grouting Pipe adopts plastic film capicitor (stake side Grouting Pipe can be in charge of with 4, and pile end grouting pipe available 6 is in charge of), and the termination tube connector is the steel pipe 4 that has internal thread.
(2) with the pile body of pre-tensioning system processing prestressed pile, the prestressing force that applies not too big (4-6MPa gets final product), pile concrete is crushed when avoiding driving piles.
(3) after concrete reaches requirement of strength, block the unnecessary reinforcing bar in two ends, will reserve the length that is slightly less than pile crown 10 column parts for the reinforcing bar of stake end parts.
(4) connect stake end grout outlet---cross 8 (also can pre-buriedly putting).
(5) with filling metaling 9 in the prefabricated pile crown 10, metaling is not filled overfill with anti-tamper stake end grout outlet.
(6) pile crown 10 is welded piles by figure with following end built-in fitting 11.
(7) piling the time is preferably adopted special pile cover, with the anti-tamper grouting port, begins slip casting after stake delivered to design elevation.
(8) adopt tube connector 3 that stake side Grouting Pipe socket 1, pile end grouting male union 2 are connected with corresponding inner thread steel pipe respectively, form the slip casting passage.
(9) annotate stake side Grouting Pipe 5, pile end grouting pipe 7 with the water under high pressure mediation, open grout outlet.
(10) measure of grouting pressure and the two controls of grouting amount is taked in slip casting, carries out a side slip casting earlier, carries out pile end grouting (generally finishing about 6 hours in the slip casting of stake side) again.
Needing under the situation of pile extension, built-in fitting is set up at the two ends of every joint stake, with the built-in fitting butt welding (can fill metaling in the space) of two sections stakes.
In order to guarantee the intact of the unidirectional grout outlet 6 of stake side behind the pile, can consider in step 1, template is reserved in corresponding position be slightly larger than a hole of side Grouting Pipe 5.
Be disposed in order template, reinforcing bar and stake side Grouting Pipe 5, pile end grouting pipe 7, following end built-in fitting 11 and go up stake end built-in fitting 13 like Fig. 2,3, guarantee that as far as possible pile end grouting pipe 7 is located at the center, stake side Grouting Pipe 5 is arranged in a side; The main body of Grouting Pipe adopts plastic film capicitor (stake side Grouting Pipe is in charge of with four, and pile end grouting effective six is in charge of), and replaces with the steel pipe 4 that has internal thread in the end; With filling metaling 9 in order to improve slip casting effect in the prefabricated pile crown 10, metaling is not filled overfill with anti-tamper stake end grout outlet; Pile crown 10 is held built-in fitting 11 welding piles by figure with stake; The measure of grouting pressure and the two controls of grouting amount is taked in slip casting, carries out a side slip casting earlier, carries out pile end grouting (generally finishing 6 hours in the slip casting of stake side) again.
Claims (10)
1. reserve the Grouting Pipe preformed pile for one kind, comprise pile body, said pile body bottom is fixedly connected with pile crown, it is characterized in that: establish a side Grouting Pipe and pile end grouting pipe in the said pile body; Said pile end grouting pipe is positioned at the center of pile body, the unidirectional grout outlet of said stake side Grouting Pipe compartment preset stake side, and the lower end of pile end grouting pipe is communicated with the outlet of said pile body lower end; Stake side tube connector is installed in the upper end of said stake side Grouting Pipe, and stake end tube connector is installed in the upper end of said pile end grouting pipe, and said stake side tube connector all is connected with the upper surface of pile body with stake end tube connector.
2. reservation Grouting Pipe preformed pile as claimed in claim 1 is characterized in that: said pile crown comprises conical head and cylinder body portion, and said cylinder body portion is cage shape or netted.
3. according to claim 1 or claim 2 reservation Grouting Pipe preformed pile, it is characterized in that: cross is installed in the lower end of pile end grouting pipe.
4. according to claim 1 or claim 2 reservation Grouting Pipe preformed pile is characterized in that: fill rubble in the said pile crown.
5. according to claim 1 or claim 2 reservation Grouting Pipe preformed pile; It is characterized in that: said pile body has at least two sections; Lean on the lower end outlet of last pile body to connect with the upper surface that abuts pile body down mutually, and two side Grouting Pipe connections in the neighbouring pile body, the connection of two pile end Grouting Pipe.
6. according to claim 1 or claim 2 reservation Grouting Pipe preformed pile, it is characterized in that: said stake side Grouting Pipe and pile end grouting pipe are bellows.
7. the pile-formation process of a reservation Grouting Pipe preformed pile as claimed in claim 1, it is characterized in that: said pile-formation process may further comprise the steps:
(1), arrange template and reinforcing bar, the pile end grouting pipe is located at the pile body center, stake side Grouting Pipe is arranged in the stake side of pile body,
(2) with the pile body of pre-tensioning system processing prestressed pile;
(3) piling and stake delivered to design elevation after begin slip casting;
(4) adopt tube connector that the Grouting Pipe joint is communicated with stake side Grouting Pipe and pile end grouting pipe respectively;
(5) with water under high pressure mediation stake side Grouting Pipe and pile end grouting pipe, open grout outlet;
(6) carry out a side slip casting earlier, carry out pile end grouting again, form preformed pile.
8. the pile-formation process of reservation Grouting Pipe preformed pile as claimed in claim 7 is characterized in that: in the said step (1), the main body of stake side Grouting Pipe and pile end grouting pipe all adopts plastic film capicitor, and the termination tube connector is the steel pipe that has internal thread.
9. like the pile-formation process of claim 7 or 8 described reservation Grouting Pipe preformed piles, it is characterized in that: in the said step (1), built-in fitting is set up at the two ends of pile body; In the said step (2), with the built-in fitting butt welding of two sections neighbouring pile bodies.
10. like the pile-formation process of claim 7 or 8 described reservation Grouting Pipe preformed piles, it is characterized in that: in the said step (1), template is being had the hole that cooperates with the unidirectional grout outlet of stake side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100832649A CN102605767A (en) | 2012-03-27 | 2012-03-27 | Precast pile reserved with grouting pipe and piling process of precast pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100832649A CN102605767A (en) | 2012-03-27 | 2012-03-27 | Precast pile reserved with grouting pipe and piling process of precast pile |
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| CN102605767A true CN102605767A (en) | 2012-07-25 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906822A (en) * | 2017-03-08 | 2017-06-30 | 威海齐德新型建材有限公司 | A kind of prefabricated foundation stake and construction method |
| CN107447750A (en) * | 2017-09-22 | 2017-12-08 | 金陵科技学院 | A kind of high intensity and it is easy to the building stake poured |
| CN108468336A (en) * | 2018-04-16 | 2018-08-31 | 浙江大学 | Slip casting machine and construction method for Ruins protection |
| CN108643169A (en) * | 2018-06-11 | 2018-10-12 | 北京市地质工程公司 | One kind can slip casting prefabricated pile and its piling construction and grouting method |
| CN109868813A (en) * | 2017-12-04 | 2019-06-11 | 中国二十冶集团有限公司 | The bottom sealing method of pile for prestressed pipe |
| CN111021359A (en) * | 2019-12-25 | 2020-04-17 | 中铁上海工程局集团有限公司 | Pressure-controllable intelligent post-grouting device and method for pile end and pile side of cast-in-situ bored pile |
| CN111778980A (en) * | 2020-07-31 | 2020-10-16 | 中建四局第一建筑工程有限公司 | Large-diameter pile grouting device |
| CN112832235A (en) * | 2021-01-08 | 2021-05-25 | 翟宇思 | Construction method and construction device for precast pile post-grouting |
| CN114411727A (en) * | 2022-02-25 | 2022-04-29 | 南京东土建设科技有限公司 | Built-in post-grouting device for realizing multi-depth grouting of tubular pile |
| CN114457833A (en) * | 2022-02-21 | 2022-05-10 | 三峡大学 | Pile foundation structure capable of being strengthened on coral sand and method |
| CN116397687A (en) * | 2023-05-26 | 2023-07-07 | 上海勘测设计研究院有限公司 | Composite pile foundation |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906822A (en) * | 2017-03-08 | 2017-06-30 | 威海齐德新型建材有限公司 | A kind of prefabricated foundation stake and construction method |
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| CN109868813A (en) * | 2017-12-04 | 2019-06-11 | 中国二十冶集团有限公司 | The bottom sealing method of pile for prestressed pipe |
| CN108468336B (en) * | 2018-04-16 | 2023-09-01 | 浙江大学 | Grouting machine for site protection and construction method |
| CN108468336A (en) * | 2018-04-16 | 2018-08-31 | 浙江大学 | Slip casting machine and construction method for Ruins protection |
| CN108643169A (en) * | 2018-06-11 | 2018-10-12 | 北京市地质工程公司 | One kind can slip casting prefabricated pile and its piling construction and grouting method |
| CN111021359A (en) * | 2019-12-25 | 2020-04-17 | 中铁上海工程局集团有限公司 | Pressure-controllable intelligent post-grouting device and method for pile end and pile side of cast-in-situ bored pile |
| CN111778980A (en) * | 2020-07-31 | 2020-10-16 | 中建四局第一建筑工程有限公司 | Large-diameter pile grouting device |
| CN112832235A (en) * | 2021-01-08 | 2021-05-25 | 翟宇思 | Construction method and construction device for precast pile post-grouting |
| CN114457833A (en) * | 2022-02-21 | 2022-05-10 | 三峡大学 | Pile foundation structure capable of being strengthened on coral sand and method |
| CN114457833B (en) * | 2022-02-21 | 2024-03-12 | 三峡大学 | Pile foundation structure capable of being reinforced on coral sand and method |
| CN114411727A (en) * | 2022-02-25 | 2022-04-29 | 南京东土建设科技有限公司 | Built-in post-grouting device for realizing multi-depth grouting of tubular pile |
| CN114411727B (en) * | 2022-02-25 | 2024-02-20 | 南京东土建设科技有限公司 | Built-in post grouting device for realizing multi-depth grouting of tubular piles |
| CN116397687A (en) * | 2023-05-26 | 2023-07-07 | 上海勘测设计研究院有限公司 | Composite pile foundation |
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Application publication date: 20120725 |