CN105735248A - Construction method for guaranteeing that pile end of prefabricated pile enters bearing layer and improving bearing force - Google Patents
Construction method for guaranteeing that pile end of prefabricated pile enters bearing layer and improving bearing force Download PDFInfo
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- CN105735248A CN105735248A CN201610140404.XA CN201610140404A CN105735248A CN 105735248 A CN105735248 A CN 105735248A CN 201610140404 A CN201610140404 A CN 201610140404A CN 105735248 A CN105735248 A CN 105735248A
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- prefabricated pile
- pile
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- stake
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
Abstract
The invention belongs to the technical field of prefabricated pile construction, and discloses a construction method for guaranteeing that the pile end of a prefabricated pile enters a bearing layer and improving the bearing force to solve the problems that according to an existing prefabricated pile construction method, the construction period is long, the construction cost is high, and a pile end cannot enter a designed bearing layer. The construction method comprises the following steps that firstly, a pile hole is manufactured, the pile hole goes deep to the bearing layer of a soil body, and the size of the cross section of the pile hole is larger than that of the cross section of the prefabricated pile; secondly, a centering guide is arranged at the upper end of the pile hole, then the prefabricated pile is hoisted up and penetrates the centering guide to enter the pile hole, and the lower end of the prefabricated pile arrives at the designed bearing layer of the soil body; thirdly, the part between the prefabricated pile and the pile hole wall is backfilled with materials; and fourthly, the backfilled materials are tamped, and construction of the prefabricated pile is finished. Compared with an existing prefabricated pile construction method, the construction method has the beneficial effects of being short in construction period, low in construction cost and high in bearing force.
Description
Technical field
The invention belongs to construction of prefabricated piles technical field, be specifically related to a kind of construction method ensureing prefabricated pile stake end entrance design supporting course and improving bearing capacity.
Background technology
Traditional construction of prefabricated piles method mainly has static pressure method and hammering method, but pile body is produced damage by both approaches on the one hand, can produce soil compaction effect on the other hand, affect stake self construction quality and surrounding enviroment.For solving these problems, have developed and replant the embedded type construction method into prefabricated pile by boring in advance.
Such as application number be 201510320942.2 patent of invention disclose the construction method of a kind of prefabricated pile to hold holding capacity, comprise the steps:
Step one, stake holes make, and casing is sunk to desired depth；Utilize the hammer of the single motor oscillating on walking or crawler type piling machine to clamp casing wall, casing is sink to desired depth；Or the knocking casing front end soil body forms hole, casing is sink to desired depth；Or by long auger, then casing is sunk to desired depth；Or form stake holes by holing with slurry wall protection mode, then casing is sink to desired depth；Or utilize diesel hammer directly to ram casing mouth top casing is sunk to desired depth.
Step 2, predetermined reinforcing soil layer is reinforced, formed and reinforce soil layer；Repeatedly ram inserts by elongated hammer, predetermined reinforcing soil layer is carried out closely knit formation compacting body；Repeatedly ramming inserts by elongated hammer, the method that predetermined reinforcing soil layer carries out closely knit formation compacting body is:
A, in casing first time fill the inserts of 0.1-0.5m3, repeatedly ram inserts with elongated hammer, until the elongated hammer hammer end does not go out bottom casing mouth, and exceed 4-10cm bottom casing mouth；
B, in batches, repeatedly in casing, fill inserts, repeatedly ram with elongated hammer until the inserts of each batch is rammed out bottom casing mouth；
C reinforces soil layer total filler amount requirement until the loading of inserts meets, and casing inner filling material is rammed out outside casing by elongated hammer, until meeting design requirement；Described inserts is rubble, brickbat, slag, broken concrete or dry concrete；
Step 3, labelling casing centre coordinate；
Step 4, by quiet for prefabricated pile be pressed in stake holes or adopt hang the mode of stake and directly prefabricated pile hung in and in casing, be put into the end face reinforcing soil layer；Prefabricated pile static pressure is entered the method in stake holes is:
A, extracting casing, Static pressure pile driver is in place, and centering is label stake site coordinate；
B, ready made prefabricated pile is fixed into Pile feeder, checks centre coordinate；
C, Static pressure pile driver or are hammered onto prefabricated pile static pressure above the reinforcing soil layer in step 2 with static pressure or hammer mode, or enter in reinforcing soil layer, complete the construction of whole stake；
Adopt and hang the mode of stake and directly prefabricated pile is hung in the method being put into the end face reinforcing soil layer in casing be: adopt crane directly vertically to be sling by precast pile and put into casing, or adopt hoist engine on stake machine to put into casing after directly being sling by prefabricated pile, then gently buckle precast pile head end face with elongated hammer and prefabricated pile is compacted to the end face reinforcing soil layer, complete the construction of whole stake.
But, the construction method of existing prefabricated pile also exists following problem:
Construction is long-term long, requires over piling machine and squeezed in stake holes by casing after making stake holes, and after casing puts in place, it is necessary to carry out compacting process to the bottom of stake holes；Thus causing long construction period.And due to some areas owing to geological stratification is very soft, occur substantial amounts of across hole in the process squeeze into casing, in order to ensure the position that casing is installed, it is necessary to pour into a mould in soil body upper end, then punch, then squeeze into casing；Thus it is long-term to extend construction further, cause that construction cost is high.
Summary of the invention
The present invention is to solve long construction period that existing prefabricated pile construction method exists and the high problem of construction cost；And provide a kind of and ensure that prefabricated pile stake end enters design supporting course and improves the construction method of bearing capacity, compared to existing construction of prefabricated piles method, shortens construction period, reduces construction cost；Improve the bearing capacity of prefabricated pile simultaneously.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is:
A kind of construction method ensureing prefabricated pile stake end entrance supporting course and improving bearing capacity, comprises the steps:
One, making stake holes, the degree of depth of stake holes is until the design supporting course of foundation soil；The cross sectional dimensions of stake holes is more than the cross sectional dimensions of prefabricated pile；
Two, installing centralizer in the upper end of stake holes, then being sling by prefabricated pile and passing centralizer enters in stake holes, and the lower end of prefabricated pile arrives the design supporting course of foundation soil；
Three, backfill with material between prefabricated pile and stake holes wall；
Four, backfill material is carried out compacting process, complete the construction of prefabricated pile.
Carry out backfilling between prefabricated pile and stake holes wall backfilling with concrete.
Backfill with crushed stone aggregate between prefabricated pile and stake holes wall.
Described prefabricated pile is for wishing pile tube, precast square pile or prefabricated polygonal pile.
Described stake holes adopts churning driven to make.
In above-mentioned steps 2, adopt crane to be sling by prefabricated pile and pass in centralizer entrance stake holes.
Described centralizer includes upper shell and lower shell, and described upper shell is horn-like, and described lower shell and prefabricated pile are mutually adapted；The outer wall of described upper shell or lower shell is connected to for the mounting bracket that centralizer is fixing.
Described lower shell includes inner core and urceolus, and the outer wall of described inner core is horizontally installed with ball bearing, and described inner core offers through hole, and the inside of inner core is stretched into through through hole in the side of described ball bearing；Described urceolus is set in the periphery of inner core.
It is 2.5-5mm that described ball bearing stretches into the length within inner core.
Compared with prior art, the method have the advantages that
The present invention ensures that prefabricated pile stake end enters supporting course and improves the construction method of bearing capacity, in whole work progress, even if there is the situation across hole (particularly soil is than relatively soft area) in the process of pore-forming, also without installing casing, also without promoting casing, thus shortening construction period, reduce the cost of construction.
The present invention avoids the generation destroying soil body supporting course in work progress, improves the bearing capacity of prefabricated pile.Owing to existing prefabricated pile passes through in work progress, by piling machine casing squeezed in the process of stake holes, there is casing and soil body supporting course is destroyed the situation of (punching), thus causing that the bearing capacity of prefabricated pile is relatively low.The present invention, in whole work progress, damages all without to supporting course, thus improving the bearing capacity of prefabricated pile.
Meanwhile, the present invention has carried out backfill process at periphery aggregate or the concrete of prefabricated pile, further increases the bearing capacity of prefabricated pile.
Accompanying drawing explanation
Fig. 1 is the structural representation of the centralizer of the present invention；
Fig. 2 is the sectional view structural representation at A-A place in Fig. 1；
Labelling in figure: 1, upper shell, 2, lower shell, 3, mounting bracket.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and described embodiment is only a part of embodiment of the present invention, is not whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art obtain under not making creative work premise other used by embodiment, broadly fall into protection scope of the present invention.
The present invention ensures that prefabricated pile stake end enters supporting course and improves the construction method of bearing capacity, comprises the steps:
One, making stake holes, the degree of depth of stake holes is until the supporting course of the soil body；The cross sectional dimensions of stake holes is more than the cross sectional dimensions of prefabricated pile；
Two, installing centralizer in the upper end of stake holes, then being sling by prefabricated pile and passing centralizer enters in stake holes, and the lower end of prefabricated pile arrives the supporting course of the soil body；The present invention is by installing centralizer, it is possible to ensure the perpendicularity of prefabricated pile, thus decreasing the operation of subsequent detection detection precast pile inclination degree.Simultaneously by centralizer, there is feature easy to use.
Three, backfill with material between prefabricated pile and stake holes wall；
Four, backfill material is carried out compacting process, complete the construction of prefabricated pile.
As the mode of a kind of selection of the present invention, carry out backfilling between prefabricated pile and stake holes wall backfilling with concrete.
As the mode that another kind of the present invention selects, backfill with crushed stone aggregate between prefabricated pile and stake holes wall.
Wherein, the selection of concrete and crushed stone aggregate is to descend the situation of water and soil body to determine in combination, and those skilled in the art can be appreciated and understood that, does not repeat them here.
Situation according to prefabricated pile, it is possible to select as requested to wish pile tube, precast square pile or prefabricated polygonal pile.
Described stake holes adopts churning driven to make.
In above-mentioned steps 2, adopt crane to be sling by prefabricated pile and pass in centralizer entrance stake holes.
In conjunction with accompanying drawing 1 and accompanying drawing 2, as a kind of preferred mode of the present invention, described centralizer includes upper shell 1 and lower shell 2, and described upper shell 1 is in horn-like, and described lower shell 2 is mutually adapted with prefabricated pile；Being connected on the outer wall of described upper shell 1 or lower shell 2 for the mounting bracket 3 that centralizer is fixing, mounting bracket 3 is arranged on lower shell.
Described lower shell 2 includes inner core 5 and urceolus 4, and the outer wall of described inner core 5 is horizontally installed with ball bearing 3, and described inner core 5 offers through hole, and the inside of inner core 5 is stretched into through through hole in the side of described ball bearing 3；Described urceolus 4 is set in the periphery of inner core 5, thus the ball bearing being arranged on inner core 5 is protected.It is 2.5-5mm that described ball bearing 6 stretches into the length within inner core 5.The centralizer of the present invention has simple in construction, feature easy to use, decreases the friction between prefabricated pile and centralizer simultaneously, it is simple to transferring of prefabricated pile.In the process of construction, first pass through mounting bracket and centralizer is fixed, when hoisting prefabricated stake, ensured the perpendicularity of prefabricated pile by the effect of centralizer.If square prefabricated pile, each ball bearing is arranged along the radial direction of lower shell.
The present invention ensures that prefabricated pile stake end enters supporting course and improves the construction method of bearing capacity, in whole work progress, even if there is the situation across hole (particularly soil is than relatively soft area) in the process of pore-forming, also without installing casing, also without promoting casing, thus shortening construction period, reduce the cost of construction.
The present invention avoids the generation destroying soil body supporting course in work progress, improves the bearing capacity of prefabricated pile.Owing to existing prefabricated pile passes through in work progress, by piling machine casing squeezed in the process of stake holes, there is casing and soil body supporting course is destroyed the situation of (punching), thus causing that the bearing capacity of prefabricated pile is relatively low.The present invention, in whole work progress, damages all without to supporting course, thus improving the bearing capacity of prefabricated pile.
Meanwhile, the present invention has carried out backfill process at periphery aggregate or the concrete of prefabricated pile, further increases the bearing capacity of prefabricated pile.
Embodiment one
Ensureing prefabricated pile stake end entrance supporting course and improving the construction method of bearing capacity of the present embodiment, comprises the steps:
One, adopting churning driven to carry out making stake holes, the degree of depth of stake holes is until the supporting course of the soil body；The cross sectional dimensions of stake holes is more than the cross sectional dimensions of prefabricated pile；
Two, centralizer is installed in the upper end of stake holes, then adopts crane to be sling by prefabricated pile and pass in centralizer entrance stake holes, and the lower end of prefabricated pile arrives the supporting course of the soil body；
Three, carry out backfilling between prefabricated pile and stake holes wall backfilling with concrete.
Four, fill concrete is carried out compacting process, complete the construction of prefabricated pile.
Embodiment two
Ensureing prefabricated pile stake end entrance supporting course and improving the construction method of bearing capacity of the present embodiment, comprises the steps:
One, adopting churning driven to carry out making stake holes, the degree of depth of stake holes is until the supporting course of the soil body；The cross sectional dimensions of stake holes is more than the cross sectional dimensions of prefabricated pile；
Two, centralizer is installed in the upper end of stake holes, then adopts crane to be sling by prefabricated pile and pass in centralizer entrance stake holes, and the lower end of prefabricated pile arrives the supporting course of the soil body；
Three, carry out backfilling between prefabricated pile and stake holes wall backfilling with crushed stone aggregate.
Four, crushed stone aggregate is carried out compacting process, complete the construction of prefabricated pile.
Embodiment three
Ensureing prefabricated pile stake end entrance supporting course and improving the construction method of bearing capacity of the present embodiment, comprises the steps:
One, adopting churning driven to carry out making stake holes, the degree of depth of stake holes is until the supporting course of the soil body；The cross sectional dimensions of stake holes is more than the cross sectional dimensions of prefabricated pile；
Two, centralizer is installed in the upper end of stake holes, then adopts crane to be sling by square prefabricated pile and pass in centralizer entrance stake holes, and the lower end of prefabricated pile arrives the supporting course of the soil body；
Three, carry out backfilling between prefabricated pile and stake holes wall backfilling with crushed stone aggregate.
Four, crushed stone aggregate is carried out compacting process, complete the construction of prefabricated pile.
Embodiment four
On the basis of any of the above-described embodiment, described centralizer includes upper shell and lower shell, and described upper shell is horn-like, and described lower shell and prefabricated pile are mutually adapted；The outer wall of described upper shell or lower shell is connected to for the mounting bracket that centralizer is fixing.
Embodiment five
On the basis of embodiment four, described lower shell includes inner core and urceolus, and the outer wall of described inner core is horizontally installed with ball bearing, and described inner core offers through hole, and the inside of inner core is stretched into through through hole in the side of described ball bearing；Described urceolus is set in the periphery of inner core.
Embodiment six
On the basis of embodiment five, it is 2.5-5mm that described ball bearing stretches into the length within inner core.
Claims (9)
1. one kind ensures that prefabricated pile stake end enters design supporting course and improves the construction method of bearing capacity, it is characterised in that comprise the steps:
One, making stake holes, the degree of depth of stake holes is until designing the supporting course of foundation soil；The cross sectional dimensions of stake holes is more than the cross sectional dimensions of prefabricated pile；
Two, installing centralizer in the upper end of stake holes, then being sling by prefabricated pile and passing centralizer enters in stake holes, and the lower end of prefabricated pile arrives the supporting course of the soil body；
Three, backfill with material between prefabricated pile and stake holes wall；
Four, backfill material is carried out compacting process, complete the construction of prefabricated pile.
2. guarantee prefabricated pile stake end according to claim 1 enters design supporting course and improves the construction method of bearing capacity, it is characterised in that step 3 backfills with concrete for carrying out backfilling between prefabricated pile and stake holes wall.
3. guarantee prefabricated pile stake end according to claim 1 enters design supporting course and improves the construction method of bearing capacity, it is characterised in that backfill with crushed stone aggregate between prefabricated pile and stake holes wall.
4. according to arbitrary described the ensureing prefabricated pile stake end entrance design supporting course and improve the construction method of bearing capacity of claim 1-3, it is characterised in that described prefabricated pile is prefabricated tubular pile, precast square pile or prefabricated polygonal pile.
5. guarantee prefabricated pile stake end according to claim 1 enters design supporting course and improves the construction method of bearing capacity, it is characterised in that described stake holes adopts churning driven to make.
6. guarantee prefabricated pile stake end according to claim 1 enters design supporting course and improves the construction method of bearing capacity, it is characterised in that in above-mentioned steps 2, adopts crane to be sling by prefabricated pile and passes in centralizer entrance stake holes.
7. guarantee prefabricated pile stake end according to claim 1 enters design supporting course and improves the construction method of bearing capacity, it is characterised in that described centralizer includes upper shell and lower shell, and described upper shell is horn-like, and described lower shell and prefabricated pile are mutually adapted；The outer wall of described upper shell or lower shell is connected to the mounting bracket for being fixed by centralizer.
8. guarantee prefabricated pile stake end according to claim 7 enters design supporting course and improves the construction method of bearing capacity, it is characterized in that, described lower shell includes inner core and urceolus, the outer wall of described inner core is horizontally installed with ball bearing, described inner core offers through hole, and the inside of inner core is stretched into through through hole in the side of described ball bearing；Described urceolus is set in the periphery of inner core.
9. guarantee prefabricated pile stake end according to claim 9 enters design supporting course and improves the construction method of bearing capacity, it is characterised in that it is 2.5-5mm that described ball bearing stretches into the length within inner core.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610140404.XA CN105735248A (en) | 2016-03-14 | 2016-03-14 | Construction method for guaranteeing that pile end of prefabricated pile enters bearing layer and improving bearing force |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610140404.XA CN105735248A (en) | 2016-03-14 | 2016-03-14 | Construction method for guaranteeing that pile end of prefabricated pile enters bearing layer and improving bearing force |
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Cited By (1)
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| CN109024558A (en) * | 2018-07-21 | 2018-12-18 | 四川启创建设工程有限公司 | A kind of construction of prefabricated piles method improving bearing capacity and torsional property |
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Application publication date: 20160706 |