CN113585245A - Construction process for rammed pile - Google Patents
Construction process for rammed pile Download PDFInfo
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- CN113585245A CN113585245A CN202110896331.8A CN202110896331A CN113585245A CN 113585245 A CN113585245 A CN 113585245A CN 202110896331 A CN202110896331 A CN 202110896331A CN 113585245 A CN113585245 A CN 113585245A
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- pile
- outer pipe
- pipe
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- inner pipe
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 239000002689 soil Substances 0.000 claims abstract description 25
- 230000002787 reinforcement Effects 0.000 claims abstract description 14
- 238000004806 packaging method and process Methods 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 5
- 238000005553 drilling Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a construction process for a rammed pile, which comprises the following steps: preparing bagged dry concrete; preparing an inner pipe, an outer pipe and a reinforcement cage; measuring and paying off; tamping the outer pipe to insert the outer pipe into the underground soil body and sinking the bagged dry concrete into the ground; pouring initial setting concrete into the outer pipe; tamping the inner pipe to insert the inner pipe into the underground soil body and jacking the initial set concrete into the ground; the initial set concrete is rammed and the inner and outer pipes are simultaneously pulled out. By adopting the technical scheme of the invention, the inner pipe and the outer pipe are tamped alternately by the rammer, and finally the initially-set concrete is tamped to enlarge the hole to form the bottom tamping expansion head, the rammer tamps and compacts the soil body at the bottom of the pile, because the outer diameter of the inner pipe is smaller than the inner diameter of the outer pipe, the outer pipe is tamped first and then the inner pipe is tamped, so that the concrete is compacted, the cross section area of the pile end is enlarged by the pile bottom tamping expansion head, and the loading force of the pile end is increased. The method solves the defects that the rammed and expanded pile can not penetrate through a harder soil layer to enter a pile bottom bearing layer and the side resistance of the pile body with the same cross section is small.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a construction process for a rammed and expanded pile.
Background
In the building engineering, the piles are classified according to the stress conditions, the friction piles, the end bearing piles and the friction end bearing piles are classified, and the bearing capacity of the piles consists of pile side resistance and pile end bearing capacity. In general, the way to increase the bearing capacity of a pile is to increase the pile-side resistance or the pile-end resistance by technical means. The pile is characterized in that a pile casing is sunk into the ground by using vibration pipe sinking equipment or hammering of a diesel hammer, dry and hard concrete is rammed in the pile casing by using a column hammer or the diesel hammer to form a pile bottom ramming and expanding head, then a reinforcement cage is placed, and a concrete pipe is poured to form a pile. The vibration immersed tube or the hammering immersed tube by a diesel hammer has the defects of large noise, non-conformity with the environmental protection requirement, poor immersed tube footage capability, difficulty in penetrating through harder soil layers to enter better bearing layers and the like, and the single pile has lower bearing capacity, thus being difficult to meet the requirement of modern buildings on the bearing capacity of pile foundations. The rammed pile has the advantages that the soil body at the bottom of the pile is reinforced by hammering, the rammed pile is hammered into a rammed enlarged head, the sectional area of the pile end is enlarged, and accordingly the resistance of the pile end is increased, but the rammed pile has the defects of high noise, poor piling efficiency, shallow hole forming depth and the like. The pipe sinking capability of the hammering and vibration pipe sinking process of the rammed and expanded pile is poor, the efficiency is low, the shape of a pile body cannot be changed, the further progress on the aspect of improving the pile side resistance cannot be achieved, how to enable the pile length of the rammed and expanded pile to be longer, the pile side resistance to be larger, or how to enable the pile bottom of a threaded pile to have no virtual soil, and the section of the pile bottom to be larger, so that the pile side resistance and the pile end resistance of a cast-in-place pile are further improved, the bearing capacity is higher, the energy is more saved, and the environment-friendly friction end bearing pile becomes a great problem in the pile foundation technical research at the present stage, and therefore, the rammed and expanded pile construction process is provided aiming at the problems.
Disclosure of Invention
In order to solve the technical problem, the invention provides a construction process of a rammed pile.
The invention is realized by the following technical scheme.
The invention provides a construction process for a rammed pile, which comprises the following steps:
the method comprises the following steps: providing a plurality of packaging bags, filling a proper amount of cement into each packaging bag, and sealing the packaging bags to obtain a plurality of bagged dry concrete;
step two: preparing an inner pipe, an outer pipe and a reinforcement cage, wherein the inner diameter of the outer pipe is larger than the outer diameter of the inner pipe, and the inner diameter of the inner pipe is larger than the outer diameter of the reinforcement cage;
step three: and (3) measurement and paying-off: carrying out measurement and setting-out according to a design drawing and determining a pile position on the ground;
step four: providing a pile machine, wherein a rammer is arranged on the pile machine, a plurality of bagged dry concrete in the step one are placed at the center of the pile position in the step three, then the outer pipe in the step two is placed on the bagged dry concrete, one end of the outer pipe is aligned to the center of the pile position, the pile machine is started, the other end of the outer pipe is rammed by the rammer, the outer pipe is inserted into underground soil, and the bagged dry concrete is sunk underground;
step five: pouring a proper amount of initial setting concrete into the outer pipe in the fourth step;
step six: placing one end of the inner pipe in the second step on the surface of the initial setting concrete in the fifth step, and tamping the other end of the inner pipe through the rammer to insert the inner pipe into the underground soil body and prop the initial setting concrete into the underground soil body;
step seven: and D, putting the reinforcement cage in the step two into the inner pipe in the step six, filling initial concrete into a gap between the inner pipe and the reinforcement cage, tamping the initial concrete through the tamping hammer, simultaneously pulling the outer pipe and the inner pipe out of the ground, and finishing construction after the initial concrete is solidified.
In the process of preparing the bagged dry concrete in the step one, the mass of the cement filled in each packaging bag is not less than 30 kg.
In the fourth step, the outer pipe is inserted into the underground soil body for at least 3.5 meters.
And fifthly, the relative height between the top surface of the initially solidified concrete poured into the outer pipe and the lower end of the outer pipe is not less than 3.5 m.
The rammed pile construction process further comprises the following steps: and after the fifth step is finished, pulling out the outer pipe for at least 2 meters, and then performing a sixth step.
And step six, when the depth of the inner pipe inserted into the underground soil body is larger than the height of the part of the inner pipe exposed above the ground, and step seven is carried out.
And when the step four or the step six is carried out, the tamping force of the tamping hammer for tamping the outer pipe or the inner pipe is required to enable the outer pipe or the inner pipe to sink by 40 cm-60 cm each time.
And seventhly, the pulling speed of the outer pipe or the inner pipe is less than 0.8 m/min.
The invention has the beneficial effects that: by adopting the technical scheme of the invention, the inner pipe and the outer pipe are tamped alternately by the rammer, and finally the initially-set concrete is tamped to enlarge the hole to form the bottom tamping expanding head, the rammer tamps and compacts the soil body at the bottom of the pile, thereby solving the problem that the pile bottom has the virtual soil and the value is small when the end load force is calculated in various drilling hole-forming pile-forming processes. The method solves the defects that the rammed and expanded pile can not penetrate through a hard soil layer to enter a pile bottom bearing layer and the side resistance of the pile body with the same cross section is small, and also solves the problem that the bearing capacity of the pile bottom of various threaded piles formed by drilling through a drill bit is low.
Drawings
FIG. 1 is a flow chart of the construction process of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
As shown in fig. 1, the invention provides a construction process of a rammed expanded pile, which comprises the following steps:
the method comprises the following steps: providing a plurality of packaging bags, filling a proper amount of cement into each packaging bag, and sealing the packaging bags to obtain a plurality of bagged dry concrete; in the preparation process of the bagged dry concrete in the step one, the mass of the cement filled in each packaging bag is not less than 30 kg.
Step two: preparing an inner pipe, an outer pipe and a reinforcement cage, wherein the inner diameter of the outer pipe is larger than the outer diameter of the inner pipe, and the inner diameter of the inner pipe is larger than the outer diameter of the reinforcement cage;
step three: and (3) measurement and paying-off: carrying out measurement and setting-out according to a design drawing and determining a pile position on the ground;
step four: providing a pile machine, wherein a rammer is arranged on the pile machine, a plurality of bagged dry concrete in the step one are placed at the center of the pile position in the step three, then the middle and outer pipes in the step two are placed on the bagged dry concrete, one end of each outer pipe is aligned to the center of the pile position, the pile machine is started, the other end of each outer pipe is rammed by the rammer, the outer pipe is inserted into the underground soil body, and the bagged dry concrete is sunk underground; in the fourth step, the outer pipe is inserted into the underground soil body for at least 3.5 meters.
Step five: pouring a proper amount of initial setting concrete into the outer pipe in the fourth step; and fifthly, the relative height between the top surface of the initially solidified concrete poured into the outer pipe and the lower end of the outer pipe is not less than 3.5 m. The rammed pile construction process further comprises the following steps: and after the fifth step is finished, pulling out the outer tube for at least 2 meters, and then performing a sixth step.
Step six: placing one end of the inner pipe in the second step on the surface of the initial setting concrete in the fifth step, and tamping the other end of the inner pipe through a tamping hammer to insert the inner pipe into the underground soil body and push the initial setting concrete into the underground soil body; and step six, when the depth of the inner pipe inserted into the underground soil body is larger than the height of the part of the inner pipe exposed above the ground, and step seven is carried out. And when the fourth step or the sixth step is carried out, the tamping force of the tamping hammer for tamping the outer pipe or the inner pipe is required to enable the outer pipe or the inner pipe to sink by 40 cm-60 cm each time.
Step seven: and (3) putting the reinforcement cage in the step two into the inner pipe in the step six, filling the gap between the inner pipe and the reinforcement cage with the initial set concrete, tamping the initial set concrete through a rammer, simultaneously pulling the outer pipe and the inner pipe out of the ground, and finishing construction after the initial set concrete is condensed. And seventhly, the pulling-out speed of the outer pipe or the inner pipe is less than 0.8 m/min.
By adopting the technical scheme of the invention, the inner pipe and the outer pipe are tamped alternately by the rammer, and finally the initially-set concrete is tamped to enlarge the hole to form the bottom tamping expanding head, the rammer tamps and compacts the soil body at the bottom of the pile, thereby solving the problem that the pile bottom has the virtual soil and the value is small when the end load force is calculated in various drilling hole-forming pile-forming processes. The method solves the defects that the rammed and expanded pile can not penetrate through a hard soil layer to enter a pile bottom bearing layer and the side resistance of the pile body with the same cross section is small, and also solves the problem that the bearing capacity of the pile bottom of various threaded piles formed by drilling through a drill bit is low.
Claims (8)
1. A pile ramming and expanding construction process is characterized in that: the method comprises the following steps:
the method comprises the following steps: providing a plurality of packaging bags, filling a proper amount of cement into each packaging bag, and sealing the packaging bags to obtain a plurality of bagged dry concrete;
step two: preparing an inner pipe, an outer pipe and a reinforcement cage, wherein the inner diameter of the outer pipe is larger than the outer diameter of the inner pipe, and the inner diameter of the inner pipe is larger than the outer diameter of the reinforcement cage;
step three: and (3) measurement and paying-off: carrying out measurement and setting-out according to a design drawing and determining a pile position on the ground;
step four: providing a pile machine, wherein a rammer is arranged on the pile machine, a plurality of bagged dry concrete in the step one are placed at the center of the pile position in the step three, then the outer pipe in the step two is placed on the bagged dry concrete, one end of the outer pipe is aligned to the center of the pile position, the pile machine is started, the other end of the outer pipe is rammed by the rammer, the outer pipe is inserted into underground soil, and the bagged dry concrete is sunk underground;
step five: pouring a proper amount of initial setting concrete into the outer pipe in the fourth step;
step six: placing one end of the inner pipe in the second step on the surface of the initial setting concrete in the fifth step, and tamping the other end of the inner pipe through the rammer to insert the inner pipe into the underground soil body and prop the initial setting concrete into the underground soil body;
step seven: and D, putting the reinforcement cage in the step two into the inner pipe in the step six, filling initial concrete into a gap between the inner pipe and the reinforcement cage, tamping the initial concrete through the tamping hammer, simultaneously pulling the outer pipe and the inner pipe out of the ground, and finishing construction after the initial concrete is solidified.
2. The rammed pile-expanding construction process according to claim 1, wherein: in the process of preparing the bagged dry concrete in the step one, the mass of the cement filled in each packaging bag is not less than 30 kg.
3. The rammed pile-expanding construction process according to claim 1, wherein: in the fourth step, the outer pipe is inserted into the underground soil body for at least 3.5 meters.
4. The rammed pile-expanding construction process according to claim 1, wherein: and fifthly, the relative height between the top surface of the initially solidified concrete poured into the outer pipe and the lower end of the outer pipe is not less than 3.5 m.
5. The rammed pile-expanding construction process according to claim 1, wherein: the rammed pile construction process further comprises the following steps: and after the fifth step is finished, pulling out the outer pipe for at least 2 meters, and then performing a sixth step.
6. The rammed pile-expanding construction process according to claim 1, wherein: and step six, when the depth of the inner pipe inserted into the underground soil body is larger than the height of the part of the inner pipe exposed above the ground, and step seven is carried out.
7. The rammed pile-expanding construction process according to claim 1, wherein: and when the step four or the step six is carried out, the tamping force of the tamping hammer for tamping the outer pipe or the inner pipe is required to enable the outer pipe or the inner pipe to sink by 40 cm-60 cm each time.
8. The rammed pile-expanding construction process according to claim 1, wherein: and seventhly, the pulling speed of the outer pipe or the inner pipe is less than 0.8 m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110896331.8A CN113585245A (en) | 2021-08-05 | 2021-08-05 | Construction process for rammed pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110896331.8A CN113585245A (en) | 2021-08-05 | 2021-08-05 | Construction process for rammed pile |
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| Publication Number | Publication Date |
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| CN113585245A true CN113585245A (en) | 2021-11-02 |
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| CN202110896331.8A Pending CN113585245A (en) | 2021-08-05 | 2021-08-05 | Construction process for rammed pile |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220592A (en) * | 2008-02-04 | 2008-07-16 | 王继忠 | Construction method of 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 |
| CN108049401A (en) * | 2018-01-26 | 2018-05-18 | 刘淼 | A kind of screw thread rammed bulb pile and its construction method |
| CN111395319A (en) * | 2020-03-23 | 2020-07-10 | 江西基业科技有限公司 | Construction method of full-ramming type secondary soil squeezing single-head club-footed pile |
-
2021
- 2021-08-05 CN CN202110896331.8A patent/CN113585245A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220592A (en) * | 2008-02-04 | 2008-07-16 | 王继忠 | Construction method of 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 |
| CN108049401A (en) * | 2018-01-26 | 2018-05-18 | 刘淼 | A kind of screw thread rammed bulb pile and its construction method |
| CN111395319A (en) * | 2020-03-23 | 2020-07-10 | 江西基业科技有限公司 | Construction method of full-ramming type secondary soil squeezing single-head club-footed pile |
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Application publication date: 20211102 |
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| RJ01 | Rejection of invention patent application after publication |