CN106836205B - The Macadam Pile Construction method suitable for saturated soft soil - Google Patents
The Macadam Pile Construction method suitable for saturated soft soil Download PDFInfo
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- CN106836205B CN106836205B CN201710166397.5A CN201710166397A CN106836205B CN 106836205 B CN106836205 B CN 106836205B CN 201710166397 A CN201710166397 A CN 201710166397A CN 106836205 B CN106836205 B CN 106836205B
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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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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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)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of the Macadam Pile Construction methods suitable for saturated soft soil, the first seamless steel casing are sunk to certain depth in pan soil, and complete drilling construction in the first seamless steel casing, the second seamless steel casing is sunk in pan soil；Drilling construction is completed in the second seamless steel casing, the stake holes in the second seamless steel casing is filled using graded broken stone filler；It is extremely concordant with the scale plate of bottom that stake holes between first seamless steel casing and the second seamless steel casing is filled using graded broken stone filler；For placing of reinforcement cage between the first seamless steel casing and the second seamless steel casing, the medial surface of steel reinforcement cage is equipped with geotextiles；Stake holes between first seamless steel casing and the second seamless steel casing is filled to concordant with the scale plate of lower section second using graded broken stone filler, is repeated to the top layer for reaching saturated soft soil.The present invention solves the problems, such as to be distributed the paxilla diameter pile body constructed not inclination and distortion using quincuncial pile.
Description
Technical field
The invention belongs to foundation in saturated soft soil process fields.It is more particularly related to a kind of soft suitable for being saturated
The Macadam Pile Construction method of soil.
Background technique
It is well known that adding with the high speed development of national economy, the rapid progress of science and technology and domestic city
Speed, so that building site growing tension, many buildings, which have to be built in, to be not appropriate on the ground as building foundation.And
The weak soil of the area such as China strand distributed more widely, lakes and marhshes, valley floor, river shoal large area, it is more and more be used to build it is various big
In type building.
Saturated soft soil as a kind of typical unfavorable foundation, physics characteristic be high void ratio, high-moisture, low-intensity,
And high-compressibility, there is apparent rheological characteristic.In pile foundation construction, due to these engineering characteristics of saturated soft soil, using
When sinking tubular gravel pile, immersed tube soil compaction can generate strong interference when constructing to stake week weak soil, can be to elder generation in the adjacent stake of injection
The pile body beaten generates soil compaction effect, causes adjacent pile foundation the problem of inclination and distortion occur, influences the bearing capacity of stake, work as adjacent studs
When body distance is less than 6 times of pile body diameter, results even in pile body and entirely destroy.
Therefore, when using the Macadam Pile Construction, it is necessary to carry out adequately processing construction, meet the rubble of paxilla diameter short distance
Pile driving construction guarantees the bearing capacity and intensity of paxilla diameter, when overcoming injection pile body, the problem of causing inclination and distortion to adjacent pile body.
Summary of the invention
It is an object of the invention to solve at least the above problems, and provide the advantages of at least will be described later.
It is a still further object of the present invention to provide a kind of the Macadam Pile Construction method suitable for saturated soft soil, guarantee that stake diameter exists
When 500~600mm, is made using blossom type stake distribution, overcome soil compaction effect, the problem of pile body is not in inclination and distortion.
In order to realize these purposes and other advantages according to the present invention, a kind of rubble suitable for saturated soft soil is provided
Pile construction method, construction ground is made of the saturated soft soil that depth is h and the pan soil below saturated soft soil, including following step
It is rapid:
Step 1: the first seamless steel casing is sunk to certain depth in pan soil, and seamless first behind guide pile hole site
Drilling construction is carried out in steel sleeve, the caliber D of the first seamless steel casing is slightly less than an electrical path length；
Step 2: the second seamless steel casing is sunk in pan soil, the second seamless steel casing caliber is less than 2/3D, and compared with
First seamless steel casing sinkage depth 1-2m；The second seamless steel casing and the first seamless steel casing are coaxially disposed,
Drilling construction is carried out in the second seamless steel casing later；
Wherein, the second seamless steel casing is located to be spaced in the truncation that length is 2/3h from top to bottom in saturated soft soil and set
Multiple scale plates are equipped with, the distance between neighbouring scale plate is 3~6m；
Step 3: filling the stake holes in the second seamless steel casing using graded broken stone filler, and it is compacted with hammer ram；
Step 4: filling the stake holes between the first seamless steel casing and the second seamless steel casing extremely using graded broken stone filler
It is concordant with the scale plate of bottom, and be compacted with hammer ram；
Step 5: placing of reinforcement cage, between the first seamless steel casing and the second seamless steel casing, the steel reinforcement cage is whole
For up big and down small frustum cone structure, height is 1/2~3/5 of distance between two adjacent scale plates, the steel reinforcement cage it is interior
Side is equipped with geotextiles；Stake holes between first seamless steel casing and the second seamless steel casing is filled using graded broken stone filler
It is extremely concordant with the scale plate of lower section second, and be compacted with hammer ram；
Step 6: repeating step 5 to the upper bottom and bottom of the steel essence cage for reaching the top layer of saturated soft soil, and being located above
Radius be respectively greater than the upper bottom of adjacent lower section steel reinforcement cage and the radius of bottom, filled with graded broken stone filler to stake top set later
Count absolute altitude.
Preferably, sinking tubular gravel pile stake position is arranged by quincuncial pile or grid stake, adjacent studs spacing be 3 times of stake diameter with
On.
Preferably, further includes:
Step 7: pulling out the second seamless steel casing, being compacted again with hammer ram, the stake adjacent with the first pile of constructing is carried out,
And then pull out the first seamless steel casing of the first pile.
Preferably, further includes:
Step 7: pulling out the second seamless steel casing, being compacted again with hammer ram, the first seamless steel casing is pulled out later, is completed
This pile operation, carries out the operation of next pile again later.
Preferably, in step 2, before the second seamless steel casing is sunk in pan soil, inner wall is fixed with geotextiles, described
Multiple viscose points are arranged in geotextiles to fix with the second seamless steel casing.
Preferably, stake electrical path length is 500~600mm.
Preferably, joined in graded broken stone filler in the step 5 and step 6 0.1~0.2% polyamides it is sub-
Amine fiber；
In the step 5 and step 6 the partial size of graded broken stone filler be 3mm~5cm.
The present invention is include at least the following beneficial effects:
1, construction of the application suitable for the stake of minor diameter in saturated soft soil overcomes in the prior art using pore-forming work
When skill, since weak soil is big to its disturbance effect, the bearing capacity of stake is reduced, therefore be only applicable to large diameter pile, and can not inserting piling
The problem of Small Diameter Pile.
2, in the prior art due to the property of saturated soft soil, the stake diameter for generally requiring pilespacing to be greater than 6 times, the application passes through
It is classified the steel reinforcement cage of pile and lower specific structure, makes pile body top that there is the protection structure of inverted pyramid type, to can realize
Small pilespacing construction.
3, it is compacted using side hammer ram, the steel reinforcement cage that diameter is gradually expanded under side arranges the saturated soft soil around pile body again
Hole that is closely knit, reducing weak soil is arranged, it is laterally strong can to increase pile body instead of the graded broken stone filler of part for multiple steel reinforcement cages
Degree, overcomes stake tilt problem caused by soil compaction effect.
4, geotextiles due to and fill material between frictional force, make geotextiles are still cylindrical to surround the second seamless steel sleeve
Material is filled in pipe, can be improved the drainage effect of pile body, reduces the consolidation time of water discharge in stake.
5, polyamides is being added in the graded broken stone filler of the second seamless steel casing lateral surface with what saturation clay contacted
Imine fiber, shearing strength greatly improve, and have buffer function to saturated soft soil, prevent pile body settlement after work.
By be arranged inverted round stage structure steel reinforcement cage, overcome pile body apart from it is close when, beat new pile to stake week weak soil generate strongly
Interference, cause adjacent studs side to due to soil compaction effect upper angled deform
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is that the present invention completes step 1~step 3 construction schematic diagram；
Fig. 2 is that the present invention completes step 4~step 6 construction schematic diagram.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
In the description of the present invention, term " transverse direction ", " longitudinal direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, is merely for convenience of description of the present invention and simplification of the description, is not that device or the element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
As shown in Fig. 1~2, wherein a is the first seamless steel of sinking casing 1, b is drilling construction, c is that sinking second is seamless
Steel sleeve, d be fill stake holes in the second seamless steel casing, e is Step 4: f~i is step 5~Step 6: j ' is to pull out
The pile of first seamless steel casing 1 and the second seamless steel casing.
The present invention provides a kind of the Macadam Pile Construction method suitable for saturated soft soil, and construction ground is soft by the saturation that depth is h
Soil and pan soil 7 positioned at the lower section of saturated soft soil 6 are constituted, the construction method of the application be suitable for major diameter (800~1600mm) with
And construction of minor diameter (500~700mm) broken stone pile in saturated soft soil, specifically includes the following steps:
Step 1: being punched out operation behind guide pile hole site, the first seamless steel casing 1 is sunk to one in pan soil later
Depthkeeping degree (depth has a projected depth for different construction sites), and pore-forming is carried out in the first seamless steel casing 1
Construction, pore-forming equipment are rotary drilling rig 2, and the caliber D of the first seamless steel casing 1 is slightly less than an electrical path length.
Step 2: the second seamless steel casing 3 is sunk in pan soil, 3 caliber of the second seamless steel casing is less than 2/3D, and
Compared with 1 sinkage depth 1-2m of the first seamless steel casing；The second seamless steel casing 3 and the first seamless steel casing 1 are coaxial
Setting, carries out drilling construction in the second seamless steel casing 3 later, only needs in the second seamless steel casing to compared with the first seamless steel sleeve
The pan soil of Guan Shen carries out pore-forming.
Wherein, the second seamless steel casing 3 is located in the truncation that length is 2/3h from top to bottom in saturated soft soil and is spaced
Multiple scale plates 4 are provided with, the distance between neighbouring scale plate 4 is 3~6m.
Step 3: filling the stake holes in the second seamless steel casing 3 using graded broken stone filler, and it is compacted with hammer ram.
Step 4: filling the stake holes between the first seamless steel casing 1 and the second seamless steel casing 3 using graded broken stone filler
It is extremely concordant with the scale plate 4 of bottom, and be compacted with hammer ram.
Step 5: placing of reinforcement cage 5 is between the first seamless steel casing 1 and the second seamless steel casing 3, the steel reinforcement cage 5
Generally up big and down small frustum cone structure, height are 1/2~3/5 of distance between two adjacent scale plates 4, the steel reinforcement cage
5 medial surface is equipped with geotextiles；Using graded broken stone filler fill the first seamless steel casing 1 and the second seamless steel casing 3 it
Between stake holes to concordant with the scale plate 4 of lower section second, and be compacted with hammer ram.In saturated soft soil, due to easy above pile foundation
Deformation is compacted using side hammer ram, and the steel reinforcement cage 5 that diameter is gradually expanded under side rearranges the saturated soft soil around pile body close
Hole that is real, reducing weak soil, multiple steel reinforcement cages 5 can increase pile body lateral strength instead of the graded broken stone filler of part,
Overcome stake tilt problem caused by soil compaction effect.
Step 6: repeating step 5 to the upper bottom and bottom of the steel essence cage for reaching the top layer of saturated soft soil, and being located above
Radius be respectively greater than the upper bottom of adjacent lower section steel reinforcement cage 5 and the radius of bottom, filled later with graded broken stone filler to stake top
Designed elevation.
In the above-mentioned technical solutions, graded broken stone filler is preferably the hard discrete material such as cobble, and clay content should be less than
5%.
In another technical solution, sinking tubular gravel pile stake position is arranged by quincuncial pile or grid stake, and adjacent studs spacing is stake
3 times or more of diameter, in the prior art due to the property of saturated soft soil, the stake diameter for generally requiring pilespacing to be greater than 6 times, the application is led to
The steel reinforcement cage 5 for crossing classification pile and lower specific structure makes pile body top have the protection structure of inverted pyramid type, so as to reality
Existing small pilespacing construction.
In another technical solution, further includes:
Step 7: pulling out the second seamless steel casing 3, being compacted again with hammer ram, the stake adjacent with the first pile of constructing is carried out,
And then the first seamless steel casing 1 of the first pile is pulled out, pull out the first seamless steel casing 1 again after adjacent pile body of having constructed
The restraining force to rubble pile body can be improved accordingly, further obviate the adverse effect around constructed to neighbouring pile body.Pull out
When two seamless steel pipes, after starting tube drawing, first 30s is stayed in vibration, later every tube drawing 1m, stops tube drawing, continues tube drawing after vibrating 30s, directly
It is extracted to the second seamless steel pipe；When pulling out the first seamless steel pipe, after starting tube drawing, first 30s is stayed in vibration, and every tube drawing 1m, stops pulling out later
Pipe continues tube drawing after vibrating 30s, until the first seamless steel pipe is extracted.Two steel sleeves are extracted using the technique, make around to be saturated
The vibration that weak soil receives is close, compacted effect is good.
In another technical solution, further includes:
Step 7: pulling out the second seamless steel casing 3, being compacted again with hammer ram, the first seamless steel casing 1 is pulled out later, it is complete
At this pile operation, the operation of next pile is carried out again later.When pulling out the second seamless steel pipe, after starting tube drawing, first 30s is stayed in vibration,
Every tube drawing 1m later stops tube drawing, continues tube drawing after vibrating 30s, until the second seamless steel pipe is extracted；Pull out the first seamless steel pipe
When, after starting tube drawing, first 30s is stayed in vibration, every tube drawing 1m later, stops tube drawing, continues tube drawing after vibrating 30s, until first seamless
Steel pipe is extracted.Two steel sleeves are extracted using the technique, make that the vibration that around saturated soft soil receives is close, compacted effect is good.
In another technical solution, in step 2, before the second seamless steel casing 3 is sunk in pan soil, inner wall is fixed with
Geotextiles, multiple viscose points are arranged in the geotextiles and the second seamless steel casing 3 is fixed.In the technical scheme, due to
One seamless steel casing 1 has been sunk in pan soil, and the native stone in pipe has been removed, and when sinking to the second seamless steel casing 3, can only be led to
It is substantially stationary to geotextiles to cross setting viscose point, when filling the second seamless steel casing 3, in hammer ram compacting process, soil can be made
Work cloth is separated with the second seamless steel casing 3, therefore, after extracting the second seamless steel casing 3, geotextiles due to and fill between material
Frictional force, so that still cylindrical surround in the second seamless steel casing 3 of geotextiles is filled material, can be improved the draining of pile body
Effect reduces the consolidation time of water discharge in stake.
In another technical solution, stake electrical path length is 500~600mm.The construction party of the application in the technical scheme
Construction of the method suitable for the stake of minor diameter in saturated soft soil, when overcoming operation pore-forming technique in the prior art, due to weak soil
It is big to its disturbance effect, reduce the bearing capacity of stake, therefore be only applicable to large diameter pile, and can not inserting piling Small Diameter Pile ask
Topic.
It joined 0.1 in graded broken stone filler in another technical solution, in the step 5 and step 6~
0.2% polyimide fiber.In the step 5 and step 6 the partial size of graded broken stone filler be 3mm~5cm.With it is full
Polyimide fiber is added in the graded broken stone filler of 3 lateral surface of the second seamless steel casing with what clay contacted, shearing resistance is strong
Degree greatly improves, and has buffer function to saturated soft soil, prevents pile body settlement after work.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (6)
1. a kind of the Macadam Pile Construction method suitable for saturated soft soil, construction ground is by the saturated soft soil that depth is h and is located at saturation
Pan soil below weak soil is constituted, which comprises the following steps:
Step 1: the first seamless steel casing is sunk to certain depth in pan soil, and in the first seamless steel sleeve behind guide pile hole site
Drilling construction is carried out in pipe, the caliber D of the first seamless steel casing is slightly less than an electrical path length；
Step 2: the second seamless steel casing is sunk in pan soil, the second seamless steel casing caliber is less than 2/3D, and compared with first
Seamless steel casing sinkage depth 1-2m；The second seamless steel casing and the first seamless steel casing are coaxially disposed, later
Drilling construction is carried out in the second seamless steel casing；Before second seamless steel casing is sunk in pan soil, inner wall is fixed with geotextiles,
Multiple viscose points are arranged in the geotextiles to fix with the second seamless steel casing；
Wherein, the second seamless steel casing is located in the truncation that length is 2/3h from top to bottom in saturated soft soil and is arranged at intervals with
Multiple scale plates, the distance between neighbouring scale plate are 3~6m；
Step 3: filling the stake holes in the second seamless steel casing using graded broken stone filler, and it is compacted with hammer ram；
Step 4: using graded broken stone filler fill the stake holes between the first seamless steel casing and the second seamless steel casing to and most
The scale plate of lower section is concordant, and is compacted with hammer ram；
Step 5: placing of reinforcement cage is between the first seamless steel casing and the second seamless steel casing, the steel reinforcement cage generally on
Small frustum cone structure under big, height are 1/2~3/5 of distance between two adjacent scale plates, the medial surface of the steel reinforcement cage
It is equipped with geotextiles；Using graded broken stone filler fill the stake holes between the first seamless steel casing and the second seamless steel casing to
The scale plate of lower section second is concordant, and is compacted with hammer ram；
Step 6: repeating step 5 to the upper bottom and the half of bottom for the steel reinforcement cage for reaching the top layer of saturated soft soil, and being located above
Diameter is respectively greater than the upper bottom of adjacent lower section steel reinforcement cage and the radius of bottom, is filled later with graded broken stone filler to design of pile top mark
It is high.
2. being suitable for the Macadam Pile Construction method of saturated soft soil as described in claim 1, which is characterized in that sinking tubular gravel pile stake
Position is arranged that adjacent studs spacing is 3 times or more of stake diameter by quincuncial pile or grid stake.
3. being suitable for the Macadam Pile Construction method of saturated soft soil as claimed in claim 2, which is characterized in that further include:
Step 7: pulling out the second seamless steel casing, being compacted again with hammer ram, the stake adjacent with the first pile of constructing is carried out, later,
The first seamless steel casing of the first pile is pulled out again.
4. being suitable for the Macadam Pile Construction method of saturated soft soil as claimed in claim 2, which is characterized in that further include:
Step 7: pulling out the second seamless steel casing, being compacted again with hammer ram, the first seamless steel casing is pulled out later, completes this root
Stake operation, carries out the operation of next pile again later.
5. the Macadam Pile Construction method suitable for saturated soft soil as described in claim 3 or 4, which is characterized in that stake electrical path length
For 500~600mm.
6. as described in claim 1 be suitable for saturated soft soil the Macadam Pile Construction method, which is characterized in that the step 5 and
It joined 0.1~0.2% polyimide fiber in step 6 in graded broken stone filler；
In the step 5 and step 6 the partial size of graded broken stone filler be 3mm~5cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710166397.5A CN106836205B (en) | 2017-03-20 | 2017-03-20 | The Macadam Pile Construction method suitable for saturated soft soil |
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| CN201710166397.5A CN106836205B (en) | 2017-03-20 | 2017-03-20 | The Macadam Pile Construction method suitable for saturated soft soil |
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| CN106836205A CN106836205A (en) | 2017-06-13 |
| CN106836205B true CN106836205B (en) | 2019-10-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111021171A (en) * | 2019-12-17 | 2020-04-17 | 中交路桥建设有限公司 | Method for widening soft soil roadbed in frozen soil area |
| CN112127350B (en) * | 2020-08-19 | 2021-09-14 | 中国港湾工程有限责任公司 | Construction process of marine gravel pile |
| CN113089627B (en) * | 2021-03-10 | 2022-09-20 | 中电建路桥集团有限公司 | Construction method of prestressed pipe pile composite foundation for deep soft soil surcharge preloading |
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