CN111549767A - Construction method for improving bearing capacity of concrete cast-in-place pile - Google Patents
Construction method for improving bearing capacity of concrete cast-in-place pile Download PDFInfo
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- CN111549767A CN111549767A CN202010460396.3A CN202010460396A CN111549767A CN 111549767 A CN111549767 A CN 111549767A CN 202010460396 A CN202010460396 A CN 202010460396A CN 111549767 A CN111549767 A CN 111549767A
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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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
-
- 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
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a construction method for improving bearing capacity of a concrete cast-in-place pile, which mainly aims at a large-thickness collapsible loess and large-thickness miscellaneous fill backfilling field; the bearing capacity of the pile end can be greatly improved, so that the pile length and the pile diameter are reduced, and in addition, the steel pile pipe is adopted for construction, so that the potential quality hazard caused by hole collapse can be avoided, and the construction difficulty and cost are increased. The technology of the invention has the characteristics of low construction cost, high speed, easily controlled quality and high single-pile bearing capacity.
Description
Technical Field
The invention relates to the technical field of cast-in-place pile construction, in particular to a construction method for improving bearing capacity of a concrete cast-in-place pile.
Background
Along with the continuous development of construction engineering, collapsible loess with large thickness and miscellaneous fill backfill sites with large thickness are frequently encountered, particularly, more and more mountain-opening backfill construction sites are encountered, and the foundation and foundation construction of the site construction industry and civil buildings is very difficult, the cost is high, the construction period is long, and the main reason is that the geological soil of the planned site can generate negative friction force on pile foundations. There are two major disadvantages if prior art cast-in-situ bored piles are used: firstly, the length of the pile is long, and the diameter of the pile is large; and secondly, the hole collapse phenomenon is generated during construction, and the quality is difficult to ensure, so that the engineering cost and the construction period are greatly improved.
Disclosure of Invention
The invention aims to provide a construction method for improving the bearing capacity of a concrete cast-in-place pile, which aims to solve the problems in the prior art, improve the bearing capacity of a pile end and ensure the effective bearing capacity of a single pile; the engineering cost is reduced, the construction period is short, and the engineering quality is well controlled.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a construction method for improving bearing capacity of a concrete cast-in-place pile, which comprises the following steps:
(1) forming a hole at the pile position, wherein the hole forming depth is the sum of the height of the pile body and the construction height of the mixed material;
(2) repeatedly tamping the hole bottom by using a columnar heavy hammer to compact the soil at the hole bottom;
(3) filling the mixed material to the bottom of the hole layer by layer and tamping until the diameter of the mixed material is enlarged and the height of the mixed material meets the design requirement;
(4) hammering a steel pile pipe which is consistent with the designed pile diameter and length into the hole by using a pile driver, wherein the bottom end of the pile pipe is positioned on the top surface of the pile body of the mixed material;
(5) putting a columnar heavy hammer into the pile tube, and tamping the top surface of the pile body of the mixed material for several times;
(6) adding dry and hard concrete into the pile pipe in multiple times, tamping the dry and hard concrete added into the pile pipe by adopting a columnar heavy hammer in multiple times, extruding and expanding the dry and hard concrete at the bottom end of the pile pipe to form a concrete expanded head, and lifting the columnar heavy hammer out of the pile pipe;
(7) placing a reinforcement cage into the pile tube;
(8) pouring concrete into the pile pipe;
(9) and after the concrete is poured, slowly pulling out the pile pipe, and finishing the pile construction.
Furthermore, in the step (1), when the hole is formed at the pile position, the hole forming method can adopt a drilling type or a immersed tube soil extrusion type; the diameter of the hole is
The depth of the holes is 10m-90 m.
Further, the diameter of the adopted cylindrical heavy hammer is smaller than the inner diameter of the pile tube, and the weight of the cylindrical heavy hammer is 2-15 tons.
Further, the mixed material is cement soil, lime soil or dry and hard concrete, in the step (3), the cement soil, the lime soil or the dry and hard concrete is filled in the hole bottom layer by layer, and the filler is tamped in the layer by layer.
Further, in the step (3), a column-shaped heavy hammer is adopted to tamp and expand a cement soil or lime soil or dry and hard concrete pile body with the diameter larger than the aperture and the height conforming to the design at the bottom end of the hole, and the diameter of the pile body is equal to that of the pile body
The length is 0.5m-18 m.
Further, in the step (4), the diameter of the pile tube is
The length of the pile pipe is 6m-80 m.
Further, in the step (6), the diameter of the concrete expansion head is
Further, in the step (8), the slump of the poured concrete is 16cm-24 cm.
Compared with the prior art, the invention has the following technical effects:
the construction method for improving the bearing capacity of the concrete cast-in-place pile mainly aims at a large-thickness collapsible loess and large-thickness miscellaneous fill backfilling field, can greatly improve the bearing capacity of the pile end, thereby reducing the length and the diameter of the pile, and in addition, because the construction adopts the steel pile pipe, the hidden quality trouble caused by hole collapse can be avoided, and the construction difficulty and the construction cost are increased. The technology of the invention has the characteristics of low construction cost, high speed, easily controlled quality and high single-pile bearing capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 shows a concrete cast-in-place pile after construction;
wherein, 1, the concrete is poured into the pile; 2 hard concrete expanding head; 3 mixing the material pile body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a construction method for improving the bearing capacity of a concrete cast-in-place pile, which aims to solve the problems in the prior art, improve the bearing capacity of a pile end and ensure the effective bearing capacity of a single pile; the engineering cost is reduced, the construction period is short, and the engineering quality is well controlled.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the present invention provides a construction method for improving bearing capacity of a concrete cast-in-place pile, which comprises the following construction steps:
(1) and forming a hole at the pile position, wherein the depth of the hole is the length of the concrete filling pile design pile length plus the length of the mixed material pile length construction. The diameter of the hole is based on the design. The hole forming method can adopt a drilling hole type or a sinking pipe soil extrusion type, and the diameter of the hole is
The depth of the holes is 10m-90 m.
(2) And repeatedly tamping the hole bottom by using a columnar heavy hammer to compact the soil at the hole bottom.
(3) Filling mixed materials such as cement soil, lime soil and dry and hard concrete layer-by-layer fillers into the hole bottom layer by layer, and tamping the materials layer by layer. Until the diameter of the mixed material pile body 3 is enlarged and the height meets the design requirement, the columnar heavy hammer is usually used for raising a certain height and continuously ramming for a plurality of times, and finally the ramming settlement meets the requirement.
(4) A steel pile pipe matched with the designed pile diameter and length is hammered into the hole by a special pile driver. The bottom end of the pile pipe is contacted with the top surface of the pile body of the mixed material pile body 3. Pile pipe diameter of
The length of the pile pipe is 6m-80 m.
(5) The column-shaped heavy hammer is put into the pile tube, and the mixed material pile body 3 is firstly tamped for a plurality of times.
(6) The dry and hard concrete is added into the pile pipe in times, the dry and hard concrete in the pile pipe is tamped by adopting the columnar heavy hammer in times, so that the dry and hard concrete is squeezed and expanded at the bottom end of the pile pipe to form a dry and hard concrete expanded head 2, and the pile pipe can be properly improved when the concrete expanded head is constructed, so that the dry and hard concrete is squeezed and expanded outwards. Wherein the diameter of the hard concrete expanding head 2 is
(7) And placing the reinforcement cage into the pile pipe.
(8) And pouring concrete into the pile pipe. The concrete slump is 16cm-24cm, and the concrete pouring amount must ensure that the pile top surface conforms to the designed pile top elevation after the pile pipe is pulled out.
(9) And slowly pulling out the pile pipe, and finishing the construction of the cast-in-place concrete pile 1.
In this embodiment, the diameter of the cylindrical weight is slightly smaller than the inner diameter of the pile tube, and the dry and hard concrete can smoothly fall into the bottom end of the pile tube from the gap between the cylindrical weight and the inner wall of the pile tube. The weight of the columnar heavy hammer is 2-15 tons, and the columnar heavy hammer can be pulled by another hoisting device or a special pile driver during construction.
Further, in this embodiment, in step (3), a pile body of cement soil or lime soil with a diameter larger than the designed bore diameter height is compacted and expanded at the bottom end of the bore by using a cylindrical heavy hammer. Having a diameter of
The length is 0.5m-18m, the adoption of a column-shaped heavy hammer for tamping, squeezing and expanding the mixed material pile body 3 is a key step for improving the bearing capacity of the concrete cast-in-place pile 1, the pile body is tamped after layered filling, the quality control takes the filling amount and the last several-strike tamping sinking amount as control standards, thereby ensuring that the squeezing and expanding diameter of the pile body meets the design requirement, and the mixed material pile body 3 can be constructed before or after being sunk into a pile pipe. Determined according to geological soil conditions. If the hole collapse phenomenon exists, the pile body 3 made of the mixed material is constructed after the pile pipe is sunk firstly.
Example one
The layering of a certain engineering geological soil is as follows: firstly, 25-30 m of miscellaneous soil is backfilled, 50m of silty clay is drilled, and underground water is not available.
Eight thirty-storey residential buildings are planned in the site, the area of each building is 840 square meters, the scheme of the pile foundation is designed, the total number of the piles is 210, and the diameter of the piles is
The length of the pile is 32 meters, the cement soil with the volume ratio of 1:6 is adopted as construction filler at the bottom end of the pile, a column-shaped heavy hammer is adopted for 4 tons, the drop distance is 8 meters, and the diameter of the extrusion expansion is 1500 mm. The length is 5 meters cement soil pile. The diameter of the hard concrete expanded head 2 on the cement-soil pile is 1500mm, the length is 1m, the concrete strength of the cast-in-place pile is C30, and the number of the main reinforcement bars of the reinforcement cage is 6
The length of the steel reinforcement cage is 32 meters, and the vertical limit bearing capacity of the single pile after construction is greater than 6000 KN.
The construction method comprises the following specific steps:
firstly, forming a hole for 38 meters at a pile position by using a drilling machine;
secondly, a special pile driver is adopted to drive a pile with the diameter of
Sinking a 34-meter-long steel pile tube into the hole for 33 meters by using an electric vibration hammer;
thirdly, a special pile driver is adopted to lead the diameter of one bottom end to be equal to
A cylindrical heavy hammer with the height of 3 meters and the weight of 4 tons is placed at the bottom end of the pile pipe, lifted by a winch for drawing the heavy hammer, the soil layer at the bottom end of the hole is tamped repeatedly, the soil layer at the bottom end of the hole is settled by 1500mm, and finally the settlement amount of the two steps is less than 50 mm;
fourthly, throwing cement soil with a volume ratio of 1:6 into the bottom of the hole, throwing 2 cubic meters of cement soil each time, lifting a heavy hammer for 8 meters, continuously tamping for 10 times, expanding the pile diameter to 1500mm, repeating the steps for 6 times, and finally, ensuring that the actual length of the cement soil pile is 6.5 meters;
fifthly, putting dry and hard concrete into the pile pipe, lifting the pile pipe by 500mm when the material is fed by 1 cubic meter each time, tamping the dry and hard concrete in the pile pipe out of the bottom end of the pile pipe by a heavy hammer, repeating the process twice, and extruding and expanding the bottom end of the pile pipe to form a pile pipe with the diameter of 1 cubic meter
A dry and hard concrete expanded head 2 with the length of 1 meter lifts the columnar heavy hammer out of the pile pipe;
sixthly, placing a reinforcement cage into the pile pipe;
seventhly, pouring pile body concrete into the pile pipe;
and eighthly, starting the pile driver, vibrating and pulling the pipe at the same time, and finishing the construction of the pile.
The engineering puts into a special pile driver, the construction period is 32 days, then the static load test is carried out, the pressure is increased to 7000KN, the settlement of the pile is 15mm, all indexes meet the design requirement, and the cost is saved by 47% by adopting the technology of the invention compared with the prior art through approximate calculation.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A construction method for improving bearing capacity of a concrete cast-in-place pile is characterized by comprising the following steps:
(1) forming a hole at the pile position, wherein the hole forming depth is the sum of the height of the pile body and the construction height of the mixed material;
(2) repeatedly tamping the hole bottom by using a columnar heavy hammer to compact the soil at the hole bottom;
(3) filling the mixed material to the bottom of the hole layer by layer and tamping until the diameter of the mixed material is enlarged and the height of the mixed material meets the design requirement;
(4) hammering a steel pile pipe which is consistent with the designed pile diameter and length into the hole by using a pile driver, wherein the bottom end of the pile pipe is positioned on the top surface of the pile body of the mixed material;
(5) putting a columnar heavy hammer into the pile tube, and tamping the top surface of the pile body of the mixed material for several times;
(6) adding dry and hard concrete into the pile pipe in multiple times, tamping the dry and hard concrete added into the pile pipe by adopting a columnar heavy hammer in multiple times, extruding and expanding the dry and hard concrete at the bottom end of the pile pipe to form a concrete expanded head, and lifting the columnar heavy hammer out of the pile pipe;
(7) placing a reinforcement cage into the pile tube;
(8) pouring concrete into the pile pipe;
(9) and after the concrete is poured, slowly pulling out the pile pipe, and finishing the pile construction.
2. The construction method for improving the bearing capacity of the cast-in-place concrete pile according to claim 1, wherein the construction method comprises the following steps: in the step (1), when the hole is formed at the pile position, the hole forming method can adopt a drilling type or a immersed tube soil extrusion type; diameter of the holeIs composed of
The depth of the holes is 10m-90 m.
3. The construction method for improving the bearing capacity of the cast-in-place concrete pile according to claim 1, wherein the construction method comprises the following steps: the diameter of the adopted columnar heavy hammer is smaller than the inner diameter of the pile pipe, and the weight of the columnar heavy hammer is 2-15 tons.
4. The construction method for improving the bearing capacity of the cast-in-place concrete pile according to claim 1, wherein the construction method comprises the following steps: the mixed material is cement soil or lime soil or hard concrete; and (3) filling cement soil, lime soil or dry hard concrete to the hole bottom layer by layer, and tamping the layered filler layer by layer.
5. The construction method for improving the bearing capacity of the cast-in-place concrete pile according to claim 4, wherein the construction method comprises the following steps: in the step (3), a pile body of cement soil, lime soil or dry and hard concrete with the diameter larger than the aperture and the height meeting the design is tamped and expanded at the bottom end of the hole by a columnar heavy hammer, and the diameter of the pile body is
The length is 0.5m-18 m.
6. The construction method for improving the bearing capacity of the cast-in-place concrete pile according to claim 1, wherein the construction method comprises the following steps: in the step (4), the diameter of the pile pipe is
The length of the pile pipe is 6m-80 m.
7. The construction method for improving the bearing capacity of the cast-in-place concrete pile according to claim 1, wherein the construction method comprises the following steps: in the step (6), the diameter of the concrete expansion head is
8. The construction method for improving the bearing capacity of the cast-in-place concrete pile according to claim 1, wherein the construction method comprises the following steps: in the step (8), the slump of the poured concrete is 16-24 cm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010460396.3A CN111549767A (en) | 2020-05-27 | 2020-05-27 | Construction method for improving bearing capacity of concrete cast-in-place pile |
| PCT/CN2020/094110 WO2021237766A1 (en) | 2020-05-27 | 2020-06-03 | Construction method for improving bearing capacity of concrete cast-in-place pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010460396.3A CN111549767A (en) | 2020-05-27 | 2020-05-27 | Construction method for improving bearing capacity of concrete cast-in-place pile |
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| CN111549767A true CN111549767A (en) | 2020-08-18 |
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| CN202010460396.3A Pending CN111549767A (en) | 2020-05-27 | 2020-05-27 | Construction method for improving bearing capacity of concrete cast-in-place pile |
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| CN (1) | CN111549767A (en) |
| WO (1) | WO2021237766A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114606933A (en) * | 2022-01-28 | 2022-06-10 | 赵关保 | Concrete filling pile for reinforcing pile bottom by adopting cement-soil mixing pile and construction method |
| CN114808950A (en) * | 2022-05-22 | 2022-07-29 | 赵关保 | Concrete cast-in-place pile with pile end reinforcing body capable of providing uplift resistance and construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220592A (en) * | 2008-02-04 | 2008-07-16 | 王继忠 | Construction method of concrete pile |
| CN102268877A (en) * | 2011-06-21 | 2011-12-07 | 刘清洁 | Construction method for great-depth or large-diameter mechanical expanding caisson pile |
| CN102733377A (en) * | 2012-04-25 | 2012-10-17 | 王继忠 | Method for constructing concrete pile |
| CN103114579A (en) * | 2013-02-22 | 2013-05-22 | 建基建设集团有限公司 | Dynamic compaction vibration compound base-expanded pile machine and construction method of dynamic compaction vibration compound base-expanded pile |
| DE102018123794B3 (en) * | 2018-09-26 | 2019-10-24 | Keller Holding Gmbh | Method for producing a tip-pressure-free component |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1137314C (en) * | 2001-12-28 | 2004-02-04 | 王继忠 | Construction method of concrete pile |
| CN100375820C (en) * | 2004-12-28 | 2008-03-19 | 王继忠 | Construction method for concrete pile |
| CN101768970B (en) * | 2010-01-14 | 2012-02-01 | 王继忠 | Construction method of concrete pile |
| CN104711976B (en) * | 2015-01-27 | 2016-06-29 | 南昌大学 | A kind of construction refuse regenerated aggregate complex carrier stake and preparation method thereof |
-
2020
- 2020-05-27 CN CN202010460396.3A patent/CN111549767A/en active Pending
- 2020-06-03 WO PCT/CN2020/094110 patent/WO2021237766A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220592A (en) * | 2008-02-04 | 2008-07-16 | 王继忠 | Construction method of concrete pile |
| CN102268877A (en) * | 2011-06-21 | 2011-12-07 | 刘清洁 | Construction method for great-depth or large-diameter mechanical expanding caisson pile |
| CN102733377A (en) * | 2012-04-25 | 2012-10-17 | 王继忠 | Method for constructing concrete pile |
| CN103114579A (en) * | 2013-02-22 | 2013-05-22 | 建基建设集团有限公司 | Dynamic compaction vibration compound base-expanded pile machine and construction method of dynamic compaction vibration compound base-expanded pile |
| DE102018123794B3 (en) * | 2018-09-26 | 2019-10-24 | Keller Holding Gmbh | Method for producing a tip-pressure-free component |
Non-Patent Citations (1)
| Title |
|---|
| 于海峰等: "《全国注册岩土工程师专业考试培训教材 第十版 下》", 31 March 2016 * |
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