CN103233467A - Construction method for expanded-base cast-in-place piles - Google Patents
Construction method for expanded-base cast-in-place piles Download PDFInfo
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- CN103233467A CN103233467A CN2013101130991A CN201310113099A CN103233467A CN 103233467 A CN103233467 A CN 103233467A CN 2013101130991 A CN2013101130991 A CN 2013101130991A CN 201310113099 A CN201310113099 A CN 201310113099A CN 103233467 A CN103233467 A CN 103233467A
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Abstract
The invention provides a construction method for expanded-base cast-in-place piles. The method comprises the steps as follows: a), pile casings are embedded to form a straight-hole pile hole, and a slurry protecting wall is formed automatically in a pile hole forming process; b), an expanded-base drill bit is fixed below a drilling machine, and the drilling distance of the drill bit is determined; c), the drilling machine is moved into the pile hole, and the bottom of the expanded-base drill bit is located at the bottom of the pile hole; d), the drilling machine is driven to drill, so that the preset drilling distance is completed; e), the opening diameter of the expanded-base drill bit is adjusted to be smaller than the diameter of the straight-hole pile hole, and the drilling machine is moved out of the pile hole; f), a reinforcement cage is lifted and fixed into the pile hole, and the reinforcement cage and the pile hole are coincided axially; g), concrete is continuously poured into the pile hole through a guide pipe above the reinforcement cage; h), a sizing agent is poured between the reinforcement cage and the pile hole wall through a grouting pipe above the reinforcement cage; and i), after initial set of the concrete, the pile casings are pulled out.
Description
Technical field
The present invention relates to the construction foundation working technical field, specifically, relate to a kind of job practices of bottom-enlarging filling pile.
Background technology
In building foundation engineering, bottom-enlarging filling pile is a kind of novel stake type that grows up on the basis of isometrical castinplace pile, and bottom-enlarging filling pile is to form an enlarged footing by pressure or mechanical mode at the stake end of isometrical castinplace pile.The advantage of bottom-enlarging filling pile is, stake end diameter is doubled to expand at the end, and then the sectional area of stake end is equivalent to four times of pile body sectional area, has improved the bearing capacity of castinplace pile greatly, thus can dwindle the stake footpath or shorten stake long, to reduce engineering quantity.Multitest is the result show: expanded bore pile is under identical stake shaft diameter size, and the axial allowable bearing of single pile is bigger than isometrical stake, and under the situation of identical bearing capacity, than isometrical pile concrete consumption conservation, and the stake footpath is more big, and concrete saving amount is more many.
Usually adopt big quality application of force hammer to make bottom-enlarging filling pile, application of force hammer carries out the movement of falling object repeatedly in castinplace pile inside in addition, forms enlarged footing until castinplace pile.Fig. 1 a-1d illustrates the job practices of bottom-enlarging filling pile in the prior art.As shown in Figure 1a, bury steel casing 10 underground, adopt the rig 20 that has common drill bit 22 on the drilling rod 21 to carry out drilling construction; Rig 20 is drilled into the straight apertures section 31 in a hole 30, and rig 20 is shifted out in stake hole 30; Shown in Fig. 1 b, stop perfusion behind the concrete of stake hole 30 interior perfusion certain altitudes, application of force hammer 40 threshes the movement of falling object in addition, beats layer of concrete repeatedly, make layer of concrete be compacted, and form expansion footpath section 32 by straight apertures section 31 to stake hole 30 diffuse outside; Shown in Fig. 1 c, be hammered into expansion end footpath section 32 and finish, application of force hammer 40 is shifted out a hole 30, the 30 interior continuation concrete perfusions to the stake hole; Shown in Fig. 1 d, treat that perfusion is finished after, insert reinforcing cages 50 in 30 to the stake hole, the band concrete initial set is extracted steel casing 10, treats concrete setting, then expanded bore pile moulding.
The shortcoming of this method is, application of force hammer beating repeatedly layer of concrete, downward pressure is provided, make the stake hole produce hole enlargement, but it is irregular to expand Bottom Shape, can not calculate the concrete specification of expanded bore pile, is unfavorable for calculating bearing capacity, and beat effect and have randomness, can not select the concrete specification of castinplace pile pile body.
Summary of the invention
The present invention makes in order to address the above problem.Specifically, the objective of the invention is to, a kind of job practices of bottom-enlarging filling pile is provided, can implement castinplace pile and expand end operation, can change the diameter dimension of castinplace pile exactly, and can select castinplace pile pile body specification neatly.
To achieve these goals, the invention provides a kind of job practices of bottom-enlarging filling pile, this method comprises: a) bury casing underground, form the straight hole pile hole, and form mud off automatically in the process that forms the stake hole; B) bottom expanding drill is fixed to the rig below, determines the distance of creeping into of described drill bit; C) described rig is moved in the stake hole, the bottom of described bottom expanding drill is positioned at a bottom, hole; D) the driving rig creeps into and finishes the predefined distance of creeping into; E) diameter of opening with described bottom expanding drill is adjusted to diameter less than the straight hole pile hole, and described rig is shifted out in the stake hole; F) with reinforcing bar cage hoisting and be fixed in the described stake hole, described reinforcing cage and described stake hole axially overlap; G) conduit by described reinforcing cage top carries out the continous pouring concrete in the stake hole; H) between described reinforcing cage and described stake hole wall, pour into slurry by the Grouting Pipe of described reinforcing cage top; I) treat concrete initial set after, described casing is extracted.
Preferably, the boring scope of described bottom expanding drill can be regulated.
Preferably, the described distance of creeping into refers to that described bottom expanding drill is in the terminal location on the described rig and the distance between the initial position.
Preferably, the position of described bottom expanding drill on the drilling rod of rig when the position of described bottom expanding drill on the drilling rod of rig when described terminal location refers to opening diameter and equating with the maximum gauge in described stake hole of described bottom expanding drill, described initial position are opening diameter and equating with described straight hole pile bore dia of described bottom expanding drill.
Preferably, the maximum of described bottom expanding drill is opened diameter more than or equal to the maximum gauge in described stake hole.
In addition, preferably, the initial position top that range limiter is installed to described bottom expanding drill is fixed.
From top description and the practice as can be known, according to the present invention, in the job practices process of bottom-enlarging filling pile, adopt bottom expanding drill that end operation is expanded in the stake hole, bottom expanding drill open diameter be can be artificial adjusting and control, so can change the diameter dimension of castinplace pile exactly, and can select castinplace pile pile body specification neatly, in addition, the shape of expansion end footpath section is regular.
Description of drawings
Fig. 1 a-1d illustrates the job practices of bottom-enlarging filling pile in the prior art.
Fig. 2 a-2d illustrates the job practices of the described bottom-enlarging filling pile of one embodiment of the present of invention.
The specific embodiment
The embodiment of the job practices of bottom-enlarging filling pile of the present invention is described below with reference to the accompanying drawings.Those of ordinary skill in the art can recognize, under situation without departing from the spirit and scope of the present invention, can revise described embodiment with various mode.Therefore, accompanying drawing is illustrative with being described in essence, rather than is used for the protection domain of restriction claim.In addition, in this manual, identical Reference numeral is represented same or analogous part.
The described bottom-enlarging filling pile job practices of embodiment of various details.Fig. 2 a-2d is schematic diagram, shows the described bottom-enlarging filling pile job practices of one embodiment of the present of invention.
Shown in Fig. 2 a, bury steel casing 10 underground, select suitable method and drilling tool, adopt the rig 20 that has common drill bit 22 on the drilling rod 21 axially to overlap with stake hole 30, rig 20 creeps in steel casing 10, forming the straight hole hole section 31 in stake hole 30, and in the process that forms stake hole 30, form mud off automatically.
Shown in Fig. 2 b, rig 20 is sling in stake hole 30, unload the common drill bit 22 of rig 20, according in advance the design the stake end diameter select corresponding bottom expanding drill 22 ', bottom expanding drill 22 ' open diameter be can be artificial adjusting and control.Therefore, can select to expand the diameter of footpath, end section 32 flexibly, make the bottom-enlarging filling pile of plurality of specifications, with bottom expanding drill 22 ' be fixed to rig 20 ' drilling rod 21 belows.Before bottom expanding drill 22 ' do not put into a hole 30 as yet, determine bottom expanding drill 22 ' creep into distance.Here, creep into the distance refer to bottom expanding drill 22 ' terminal location and the distance between the initial position.Wherein, terminal location be bottom expanding drill 22 ' the expansion of opening diameter and stake hole 30 at the bottom of the maximum gauge of footpath section 32 bottom expanding drill 22 when equating ' rig 20 ' drilling rod 21 on the position; Initial position be described bottom expanding drill 22 ' open the equal diameters of diameter and straight apertures section 31 time bottom expanding drill 22 ' rig 20 ' drilling rod 21 on the position.Preferably, bottom expanding drill 22 ' maximum open diameter more than or equal to the expansion in stake hole 30 at the bottom of the maximum gauge of footpath section 32.Bottom expanding drill 22 ' maximum open the maximum gauge that diameter is set to footpath section 32 at the bottom of the expansion in preferred pile hole 30, then do not need to determine bottom expanding drill 22 ' terminal location.With range limiter 23 be installed to bottom expanding drill 22 ' initial position top fix.
To have bottom expanding drill 22 ' rig 20 ' immigration stake hole 30 in, bottom expanding drill 22 ' the bottom be positioned at straight apertures section 31 bottoms in a hole 30, bottom expanding drill 22 ' the equal diameters of opening diameter and the straight apertures section 31 in stake hole 30.
Shown in Fig. 2 c, driving have bottom expanding drill 22 ' rig 20 ' creep into straight down, bottom expanding drill 22 ' move to terminal location from the initial position of demarcating on drilling rod, namely the diameter in stake hole by the enlarged-diameter of straight apertures section 31 to the diameter that expands footpath, the end sections 32, the radial and axial cutting force of rig 20 ' make bottom expanding drill 22 ' have, the bottom expanding drill 22 of rotation ' will be according to the ground on certain shape cutting stake hole wall, the shape that therefore expands footpath, end section 32 is rule.When the predefined distance of creeping into of bottom expanding drill 22 ' finish, i.e. bottom expanding drill 22 ' the be positioned at stake during end of expanding sizing section 32 continues to keep bottom expanding drill 22 ' original place to rotate a few.Then, with bottom expanding drill 22 ' the diameter of opening be adjusted to diameter less than straight apertures section 31, with rig 20 ' in stake hole 30, shift out residue at the bottom of the cleaning eye.
Shown in Fig. 2 d, reinforcing cage 50 is lifted and is fixed in the hole 30, reinforcing cage 50 and stake hole 30 axially overlap, residue at the bottom of the cleaning eye, conduit by 50 reinforcing cages top carries out the continous pouring concrete in stake hole 30, the concrete perfusion finishes, and pours into slurry by the Grouting Pipe of reinforcing cage 50 tops between reinforcing cage 50 and stake hole wall.After treating concrete initial set, casing 10 is extracted, like this, bottom-enlarging filling pile has just formed.
From top description and the practice as can be known, according to the present invention, in the job practices process of bottom-enlarging filling pile, adopt bottom expanding drill that end operation is expanded in the stake hole, bottom expanding drill open diameter be can be artificial adjusting and control, so can change the diameter dimension of castinplace pile exactly, and can select castinplace pile pile body specification neatly, in addition, the shape of expansion end footpath section is regular.
As above in the mode of example Bored Pile Construction method of the present invention has been described with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that for said method, can also make various improvement and combination on the basis that does not break away from content of the present invention.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (6)
1. the job practices of a bottom-enlarging filling pile comprises:
A) bury casing underground, form the straight hole pile hole, and in the process that forms the stake hole, form mud off automatically;
B) bottom expanding drill is fixed to the rig below, determines the distance of creeping into of described drill bit;
C) described rig is moved in the stake hole, the bottom of described bottom expanding drill is positioned at a bottom, hole;
D) the driving rig creeps into and finishes the predefined distance of creeping into;
E) diameter of opening with described bottom expanding drill is adjusted to diameter less than the straight hole pile hole, and described rig is shifted out in the stake hole;
F) with reinforcing bar cage hoisting and be fixed in the described stake hole, described reinforcing cage and described stake hole axially overlap;
G) conduit by described reinforcing cage top carries out the continous pouring concrete in the stake hole;
H) between described reinforcing cage and described stake hole wall, pour into slurry by the Grouting Pipe of described reinforcing cage top;
I) treat concrete initial set after, described casing is extracted.
2. the job practices of bottom-enlarging filling pile as claimed in claim 1, wherein, the boring scope of described bottom expanding drill can be regulated.
3. the job practices of bottom-enlarging filling pile as claimed in claim 1, wherein, the described distance of creeping into refers to that described bottom expanding drill is in the terminal location on the described rig and the distance between the initial position.
4. the job practices of bottom-enlarging filling pile as claimed in claim 1, wherein, the position of described bottom expanding drill on the drilling rod of rig when the position of described bottom expanding drill on the drilling rod of rig when described terminal location is opening diameter and equating with the maximum gauge in described stake hole of described bottom expanding drill, described initial position are opening diameter and equating with described straight hole pile bore dia of described bottom expanding drill.
5. the job practices of bottom-enlarging filling pile as claimed in claim 1, wherein, the maximum of described bottom expanding drill is opened diameter more than or equal to the maximum gauge in described stake hole.
6. the job practices of bottom-enlarging filling pile as claimed in claim 1, wherein, the initial position top that range limiter is installed to described bottom expanding drill is fixed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101130991A CN103233467A (en) | 2013-04-02 | 2013-04-02 | Construction method for expanded-base cast-in-place piles |
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| CN2013101130991A CN103233467A (en) | 2013-04-02 | 2013-04-02 | Construction method for expanded-base cast-in-place piles |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410142A (en) * | 2013-08-09 | 2013-11-27 | 武汉中力岩土工程有限公司 | Construction method for cast-in-place pile through punching and base expanding and base expanding device |
| CN103526745A (en) * | 2013-10-14 | 2014-01-22 | 何霞 | Reinforced concrete pile welding process and reinforced concrete pile |
| CN104631441A (en) * | 2014-12-19 | 2015-05-20 | 五广（上海）基础工程有限公司 | Two-segment type rotary-excavating expanded bore pile construction method |
| CN104631442A (en) * | 2014-12-24 | 2015-05-20 | 福建工程学院 | Full casing pipe soil taking vibration construction method for squeezed and expanded cast-in-place pile |
| CN105155519A (en) * | 2015-09-29 | 2015-12-16 | 中国一冶集团有限公司 | Rotary-excavating under-reamed bored pile constructing method |
| CN106939595A (en) * | 2017-02-14 | 2017-07-11 | 中建二局第三建筑工程有限公司 | Construction process of rotary digging bottom expanding cast-in-place pile |
| CN110344764A (en) * | 2019-07-26 | 2019-10-18 | 范茂丰 | Base expanding and base expanding reperfusion pile mechanical piling device and its pile making method |
| CN112302004A (en) * | 2020-11-11 | 2021-02-02 | 辽宁工程技术大学 | Cast-in-place pile with upper straight rod and lower expanded-base structure for reducing negative frictional resistance and construction method thereof |
| CN114837170A (en) * | 2022-04-08 | 2022-08-02 | 中国电建集团华东勘测设计研究院有限公司 | Drilling root-planting expanded-bottom end bearing pile and construction method thereof |
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| JP2002138470A (en) * | 2000-10-30 | 2002-05-14 | Taisei Corp | Developing tool of cage, under-reamed pile method and structure of under-reamed pile |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410142A (en) * | 2013-08-09 | 2013-11-27 | 武汉中力岩土工程有限公司 | Construction method for cast-in-place pile through punching and base expanding and base expanding device |
| CN103410142B (en) * | 2013-08-09 | 2015-09-30 | 武汉中力岩土工程有限公司 | A kind of construction method of punching bottom-enlarging filling pile and expansion end device |
| CN103526745A (en) * | 2013-10-14 | 2014-01-22 | 何霞 | Reinforced concrete pile welding process and reinforced concrete pile |
| CN104631441A (en) * | 2014-12-19 | 2015-05-20 | 五广（上海）基础工程有限公司 | Two-segment type rotary-excavating expanded bore pile construction method |
| CN104631442A (en) * | 2014-12-24 | 2015-05-20 | 福建工程学院 | Full casing pipe soil taking vibration construction method for squeezed and expanded cast-in-place pile |
| CN105155519A (en) * | 2015-09-29 | 2015-12-16 | 中国一冶集团有限公司 | Rotary-excavating under-reamed bored pile constructing method |
| CN106939595A (en) * | 2017-02-14 | 2017-07-11 | 中建二局第三建筑工程有限公司 | Construction process of rotary digging bottom expanding cast-in-place pile |
| CN110344764A (en) * | 2019-07-26 | 2019-10-18 | 范茂丰 | Base expanding and base expanding reperfusion pile mechanical piling device and its pile making method |
| CN112302004A (en) * | 2020-11-11 | 2021-02-02 | 辽宁工程技术大学 | Cast-in-place pile with upper straight rod and lower expanded-base structure for reducing negative frictional resistance and construction method thereof |
| CN114837170A (en) * | 2022-04-08 | 2022-08-02 | 中国电建集团华东勘测设计研究院有限公司 | Drilling root-planting expanded-bottom end bearing pile and construction method thereof |
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Address after: 100085, Beijing, Beijing economic and Technological Development Zone, Kangding street, No. 1, 2, six or seven, Daxing District Applicant after: MCC COMMUNICATION CONSTRUCTION GROUP CO., LTD. Address before: 100028, Beijing, Chaoyang District, No. 28, west of China Metallurgical Building, 18 and 19 Applicant before: MCC Communication Engineering Technology Co., Ltd. |
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Application publication date: 20130807 |