CN113106992A - Construction method of variable cross-section anchoring type micro pile - Google Patents
Construction method of variable cross-section anchoring type micro pile Download PDFInfo
- Publication number
- CN113106992A CN113106992A CN202110468331.8A CN202110468331A CN113106992A CN 113106992 A CN113106992 A CN 113106992A CN 202110468331 A CN202110468331 A CN 202110468331A CN 113106992 A CN113106992 A CN 113106992A
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- Prior art keywords
- pile
- variable cross
- micropile
- miniature
- anchor rod
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- 238000004873 anchoring Methods 0.000 title claims abstract description 22
- 238000010276 construction Methods 0.000 title claims abstract description 10
- 230000001681 protective effect Effects 0.000 claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 6
- 239000011440 grout Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims 1
- 239000002002 slurry Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
Abstract
The invention aims to disclose a construction method of a variable cross-section anchoring type micro pile, which comprises the following steps: vertically driving the miniature pile into the soil body of the sliding body, so that the middle point of the protective sleeve is positioned on the slip crack surface; the anchor rod penetrates through the mounting hole, and one end of the anchor rod is driven into the sliding body; and pressurizing and grouting from the top of the micro pile, wherein the grout seeps out from the opening of the protective sleeve to form a mixed material with the peripheral soil body to reinforce the peripheral soil body. The problem of among the prior art miniature stake can take place to buckle even destroy with the slip crack face contact surface department is solved.
Description
Technical Field
The invention belongs to the technical field of landslide prevention and control and pile foundation engineering, and particularly relates to a construction method of a variable cross-section anchoring type micro pile.
Background
The micro-piles belong to flexible piles, the bearing capacity of a single pile is small, and the micro-piles can be generally arranged into pile groups or combined with other structures in engineering application to form different combination forms. However, when the glide amount of the landslide body is larger and larger, the self weight of the soil body is increased continuously, the increased landslide thrust is born by a system formed by the pile and the soil body, when the landslide thrust is increased to a certain degree, the contact surface of the micro pile and the slide bed is bent or even damaged, and due to the insecurity of the micro pile, a large amount of experimental research and theoretical discussion are needed to be carried out on the reinforcing mechanism of the micro pile on the slide bed, so that the variable cross section anchoring type micro pile is provided.
Disclosure of Invention
The invention aims to provide a construction method of a variable cross-section anchoring type micro pile, which aims to solve the problem that the contact surface of the micro pile and a slip crack surface in the prior art is bent or even damaged.
The invention adopts the following technical scheme: a construction method of a variable cross-section anchoring type micro pile comprises the following steps:
vertically driving the miniature pile into the soil body of the sliding body, so that the middle point of the protective sleeve is positioned on the slip crack surface;
the anchor rod penetrates through the mounting hole, and one end of the anchor rod is driven into the sliding body;
pressurizing and grouting from the top of the micro pile, and enabling the grout to seep out from the opening of the protective sleeve to form a mixed material with the peripheral soil body to reinforce the peripheral soil body;
wherein, the structure of variable cross section anchor type micropile includes:
the miniature pile is a steel pipe concrete pile;
the protective sleeve is a cylinder which is coaxial and fixedly sleeved outside the pile body of the miniature pile, a plurality of through holes are uniformly distributed on the circumferential surface of the protective sleeve, and the through holes are communicated with the inside of the miniature pile;
the mounting hole is a through hole which obliquely penetrates through the pile body at the top of the miniature pile, and the included angle between the axis of the mounting hole and the horizontal line is 25 +/-5 degrees;
the anchor rod penetrates through the mounting hole, and one end of the anchor rod penetrates through the slip crack surface and is inserted into the slip body;
the bottom of the micro pile is vertically inserted into the sliding body, and is used for grouting through the top of the micro pile and discharging through the protective sleeve so as to reinforce the connection between the micro pile and the sliding body; the stock is used for providing lateral support power for the micropile.
Furthermore, a plurality of micro-piles are arranged on the slip crack surface in a quincunx shape, the pile pitch of each micro-pile is 10 times of the pile diameter, and the row pitch of each micro-pile is 8 times of the pile diameter.
Further, the anchoring depth of each micro-pile is 1/3 of the length of the pile body.
Furthermore, the protective sheath sets up in the one third position in the below of miniature stake pile body.
Further, the anchor rod is a grouting anchor rod.
Further, the diameter of the mounting hole is 25 mm; the diameter of the pile body of the micro pile is 120 mm; the diameter of protective sheath is 140mm, and length is 2000mm, and the wall thickness is 10mm, and the through-hole diameter is 10 mm.
The invention has the beneficial effects that: the utility model provides a variable cross section anchor type micro pile, its simple structure, reasonable in design can play the great effect for micro pile consolidates the landslide, can more effectual resistance sliding force in the use, and the facilitate promotion is used. The steel protective sleeve is additionally arranged on the pile body of the miniature pile, so that the rigidity of the miniature pile at a slip crack surface is increased, and the phenomenon that the contact surface of the miniature pile and a sliding bed is bent or even damaged can be effectively prevented; the slurry seeps out of the opening of the steel protective sleeve of the micro pile and forms a mixed material with the soil body around the sliding surface to reinforce the soil body around the sliding surface, so that the shear strength of the soil body around the sliding surface is improved, and the slip resistance is increased; through driving the stock into the sliding bed, provide sufficient pulling force, overcome the dead weight and the sliding force of gliding mass, can effectually prevent the emergence of landslide phenomenon.
Drawings
FIG. 1 is a schematic view of a variable cross-section anchoring type micropile according to the present invention in use;
FIG. 2 is a schematic structural view of a variable cross-section anchoring type micropile of the present invention without including an anchor rod;
fig. 3 is a schematic view of the installation and arrangement of the variable cross-section anchoring type micropile of the present invention.
The pile comprises a miniature pile body 1, a protective sleeve 2, an anchor rod 3, an installation hole 4, a slip crack surface 5 and a slip bed 6.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a construction method of a variable cross-section anchoring type micro pile, which comprises the following steps:
determining parameters of the landslide according to an engineering geological survey report, and determining the worst sliding surface of the side slope, namely a slip crack surface;
driving the micro pile with the steel protective sleeve into a sliding bed 6 to be treated, ensuring that the micro pile is vertically driven into an anchored rock mass which penetrates through a slip crack surface 5 and enters the sliding bed 6, and ensuring that the middle point of the steel protective sleeve 2 is positioned on the slip crack surface 5;
the anchor rod penetrates through holes on two sides of the pile body, one end of the anchor rod 3 penetrates through a slip crack surface 5 and is driven into a slip bed 6, and anchoring is carried out through high-pressure grouting and prestress application;
and pressurizing and grouting from the top of the micro pile, wherein slurry seeps out from the opening of the steel protective sleeve of the micro pile to form a mixed material with the soil around the slip fracture surface 5 to reinforce the soil around the slip fracture surface, so that the shear strength of the soil around the slip fracture surface 5 is improved, and the slip resistance is increased.
As shown in fig. 1, the variable cross-section anchoring type micro pile used in the construction method of the variable cross-section anchoring type micro pile comprises a micro pile 1, a protective sleeve 2, a mounting hole 4 and an anchor rod 3. The bottom of the micro pile 1 is vertically inserted into the slide bed 6 and is used for grouting through the top of the micro pile and then is discharged through the protective sleeve 2 so as to reinforce the connection between the micro pile 1 and the slide bed 6; the anchor rods 3 are used to provide lateral support force for the micropile 1. Miniature stake 1 includes the miniature stake of steel pipe concrete pile, and a steel protective sheath welding is at miniature stake pile body, and steel protective sheath whole body is equipped with the through-hole that the plum blossom form was arranged, and the through-hole runs through miniature stake, and pile body upper portion is equipped with the through-hole for squeeze into the stock, the stock is squeezed into the angle and is 25 +/-5 with water flat line contained angle, wholly forms a variable cross section anchor type miniature stake, consolidates and squeezes the anti-skidding power that the stock anchor increased miniature stake through the steel protective sheath.
In some embodiments, as shown in fig. 3, the plurality of micropiles 1 are arranged in a quincunx pattern, each micropile having a distance between the micropiles of 10 times the diameter of the micropiles, and each micropile having a pitch of 8 times the diameter of the micropiles.
In some embodiments, the protective sleeve 2 is disposed at a lower third of the shaft of the micropile 1.
In some embodiments, each micropile has an anchor depth of 1/3 shaft lengths.
In some embodiments, as shown in fig. 2, the mounting hole 4 has a diameter of 25 mm; the diameter of the pile body of the miniature pile 1 is 120 mm; the diameter of the protective sleeve 2 is 140mm, the length is 2000mm, the wall thickness is 10mm, and the diameter of the through hole is 10 mm.
The variable cross-section anchoring type micro pile designed by the invention comprises a variable cross-section anchoring micro pile which is composed of a micro pile 1 of a steel pipe concrete pile, a steel protective sleeve 2 and an anchor rod 3, as shown in figure 1. Two through holes are formed in two sides of the pile body of the miniature pile, the through holes penetrate through the miniature pile and are used for driving the anchor rods, the included angle between the driving angle of the anchor rods and the horizontal line is 25 +/-5 degrees, pressurized grouting is conducted from the top of the miniature pile, grout seeps out from the steel protective sleeve opening of the miniature pile and forms mixed materials with the soil body around the slip crack surface 5 to reinforce the soil body around the slip crack surface, the shear strength of the soil body around the slip crack surface 5 is improved, and the slip resistance is increased.
The method is characterized in that a miniature pile is vertically driven into a sliding bed 6 to anchor a rock mass through a sliding surface 5, the middle point of a steel protective sleeve is positioned in 1m of the sliding surface 5 upwards and downwards respectively, the maximum pile diameter of the steel protective sleeve is 2 times of the pile diameter of the miniature pile 1, the miniature pile is used for reinforcing an accumulation layer, the accumulation layer is characterized by shallow landslide, and the thickness of the landslide layer is 4-5 m, so that the pile body of the miniature pile extending into the sliding bed 6 is reinforced by the steel protective sleeve, the steel protective sleeve enables the rigidity of the miniature pile at the sliding surface 5 to be increased, and the phenomenon that the contact surface of the miniature pile and the sliding bed 6 is bent or even damaged is effectively prevented; the slurry seeps out of the opening of the steel protective sleeve of the micro pile and forms a mixed material with the soil body around the slip crack surface 5 to reinforce the soil body around the slip crack surface 5, so that the shear strength of the soil body around the slip crack surface 5 is improved, and the slip resistance is increased; through driving the stock into the sliding bed, provide sufficient pulling force, overcome the dead weight and the sliding force of gliding mass, can effectually prevent the emergence of landslide phenomenon. The anti-slip force of the sliding slope surface is increased, so that the anti-slip force of the pile body is fully exerted, the soil body above the slip crack surface 5 is reinforced, the anti-slip force is increased, and the safety coefficient of the most dangerous surface is improved.
Claims (6)
1. A construction method of a variable cross-section anchoring type micro pile is characterized by comprising the following steps:
vertically driving a miniature pile (1) into the soil body of the sliding body (6) to enable the middle point of the protective sleeve (2) to be positioned on the slip crack surface (5);
the anchor rod (3) penetrates through the mounting hole (4), and one end of the anchor rod (3) is driven into the sliding body (6);
pressurizing and grouting from the top of the micro pile (1), and enabling the grout to seep out from the opening of the protective sleeve (2) to form a mixed material with the peripheral soil body to reinforce the peripheral soil body;
wherein, the structure of variable cross section anchor type micropile includes:
the miniature pile (1) is a steel pipe concrete pile;
the protective sleeve (2) is a cylinder which is coaxial and fixedly sleeved on the outer side of the pile body of the miniature pile (1), a plurality of through holes are uniformly distributed on the circumferential surface of the protective sleeve (2), and the through holes are communicated with the inside of the miniature pile (1);
the mounting hole (4) is a through hole which obliquely penetrates through the pile body at the top of the miniature pile (1), and the included angle between the axis of the mounting hole (4) and the horizontal line is 25 +/-5 degrees;
the anchor rod (3) penetrates through the mounting hole (4) and one end of the anchor rod is inserted into the sliding body (6) through the slip crack surface (5);
the bottom of the micro pile (1) is vertically inserted into the sliding body (6) and is used for grouting through the top of the micro pile and then is discharged through the protective sleeve (2) so as to reinforce the connection between the micro pile (1) and the sliding body (6); the anchor rod (3) is used for providing lateral supporting force for the miniature pile (1).
2. The method for constructing a variable cross-section anchoring type micropile according to claim 1, wherein a plurality of said micropiles (1) are arranged on the slip surface (5) in a quincunx pattern, the pitch of each of said micropiles (1) is 10 times the diameter of the micropile, and the pitch of each of the micropiles is 8 times the diameter of the micropile.
3. A method for constructing an anchor micropile of variable cross-section according to claim 1 or 2, wherein each micropile (1) is anchored to 1/3 the length of its shaft.
4. The method for constructing a variable cross-section anchoring micropile according to claim 1 or 2, wherein said protective sheath (2) is placed in the lower third of the shaft of said micropile (1).
5. The method for constructing a micro pile of variable cross-section anchoring type according to claim 1 or 2, wherein the anchor rod (3) is a slip-casting anchor rod.
6. The construction method of a variable cross-section anchoring type micropile according to claim 1 or 2, wherein the diameter of the installation hole (4) is 25 mm; the diameter of the pile body of the miniature pile (1) is 120 mm; the diameter of protective sheath (2) is 140mm, and length is 2000mm, and the wall thickness is 10mm, and the through-hole diameter is 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110468331.8A CN113106992A (en) | 2021-04-28 | 2021-04-28 | Construction method of variable cross-section anchoring type micro pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110468331.8A CN113106992A (en) | 2021-04-28 | 2021-04-28 | Construction method of variable cross-section anchoring type micro pile |
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| Publication Number | Publication Date |
|---|---|
| CN113106992A true CN113106992A (en) | 2021-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110468331.8A Pending CN113106992A (en) | 2021-04-28 | 2021-04-28 | Construction method of variable cross-section anchoring type micro pile |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458345A (en) * | 2003-04-29 | 2003-11-26 | 立基工程有限公司 | Combined pile section with reinfored horizontal bending strength and rigidity and its construction method |
| JP2015021369A (en) * | 2013-07-23 | 2015-02-02 | 旭化成建材株式会社 | Pile |
| CN106245629A (en) * | 2016-09-13 | 2016-12-21 | 大连理工大学 | A kind of anti-skid uplift pile in mountain area and method for designing thereof |
| CN109868812A (en) * | 2019-03-18 | 2019-06-11 | 绿城乐居建设管理集团有限公司 | A kind of pouch diameter-variable pile and its construction method |
| CN109914446A (en) * | 2019-04-11 | 2019-06-21 | 西安工业大学 | A kind of strong skid resistance mini pile and its construction method of landslide-proofing |
| CN209779642U (en) * | 2019-01-31 | 2019-12-13 | 西安工业大学 | Miniature pile with antiskid structure and retaining wall assembly thereof |
| CN111021376A (en) * | 2019-12-18 | 2020-04-17 | 中国地质科学院探矿工艺研究所 | Three-dimensional frame pile body structure for deep landslide treatment and construction process thereof |
| CN211898463U (en) * | 2020-03-20 | 2020-11-10 | 西安公路研究院 | Reinforcing device combining micro-steel pipe pile and anchor rod |
-
2021
- 2021-04-28 CN CN202110468331.8A patent/CN113106992A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1458345A (en) * | 2003-04-29 | 2003-11-26 | 立基工程有限公司 | Combined pile section with reinfored horizontal bending strength and rigidity and its construction method |
| JP2015021369A (en) * | 2013-07-23 | 2015-02-02 | 旭化成建材株式会社 | Pile |
| CN106245629A (en) * | 2016-09-13 | 2016-12-21 | 大连理工大学 | A kind of anti-skid uplift pile in mountain area and method for designing thereof |
| CN209779642U (en) * | 2019-01-31 | 2019-12-13 | 西安工业大学 | Miniature pile with antiskid structure and retaining wall assembly thereof |
| CN109868812A (en) * | 2019-03-18 | 2019-06-11 | 绿城乐居建设管理集团有限公司 | A kind of pouch diameter-variable pile and its construction method |
| CN109914446A (en) * | 2019-04-11 | 2019-06-21 | 西安工业大学 | A kind of strong skid resistance mini pile and its construction method of landslide-proofing |
| CN111021376A (en) * | 2019-12-18 | 2020-04-17 | 中国地质科学院探矿工艺研究所 | Three-dimensional frame pile body structure for deep landslide treatment and construction process thereof |
| CN211898463U (en) * | 2020-03-20 | 2020-11-10 | 西安公路研究院 | Reinforcing device combining micro-steel pipe pile and anchor rod |
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Application publication date: 20210713 |
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