CN111305250A - Collapsible loess foundation structure treated by T-shaped compaction piles and construction method - Google Patents
Collapsible loess foundation structure treated by T-shaped compaction piles and construction method Download PDFInfo
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- CN111305250A CN111305250A CN202010184945.9A CN202010184945A CN111305250A CN 111305250 A CN111305250 A CN 111305250A CN 202010184945 A CN202010184945 A CN 202010184945A CN 111305250 A CN111305250 A CN 111305250A
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- 238000005056 compaction Methods 0.000 title claims abstract description 45
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims description 63
- 239000004571 lime Substances 0.000 claims description 18
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 17
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000012634 fragment Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000012856 packing Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 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
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/16—Foundations formed of separate piles
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/227—Gutters; Channels ; Roof drainage discharge ducts set in sidewalks
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/34—Foundations for sinking or earthquake territories
-
- 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0037—Clays
- E02D2300/0039—Clays mixed with additives
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a collapsible loess foundation structure treated by T-shaped compaction piles and a construction method thereof. The method is practical, reasonable in technology, and investment-saving, can effectively solve the problem of collapsibility of the loess foundation, and enriches the collapsibility loess foundation treatment technology.
Description
Technical Field
The invention relates to the technical field of civil construction, in particular to a collapsible loess foundation structure treated by a T-shaped compaction pile and a construction method.
Background
Compaction piles are one method of treating collapsible loess foundations. The method is characterized in that a pile hole is formed in soil by using methods of driving a steel sleeve, vibrating a pipe sinking and the like, then lime soil, cement soil or plain soil is backfilled in the hole layer by layer and tamped to form the pile, and common compaction piles comprise a soil compaction pile, a lime (cement) soil compaction pile and the like.
The main design parameters of the compaction pile include pile hole diameter, pile spacing, compaction coefficient and the like. The distance between the piles is generally 2.0 to 3.0 times of the diameter of the pile hole. In specific engineering practice, the diameter of the pile hole within the range of compaction depth is a fixed value. However, in the range of the compaction depth, the lower soil layer has a small collapse coefficient and the upper soil layer has a large collapse coefficient, that is, the diameter of the lower soil layer is smaller than that of the upper soil layer at the same pile spacing, and the upper soil layer and the lower soil layer have different pile diameters, which is economical and reasonable.
Disclosure of Invention
The invention aims to provide a collapsible loess foundation structure treated by a T-shaped compaction pile and a construction method thereof.
The technical scheme adopted by the invention is as follows:
collapsible loess foundation structure is handled to T shape compaction stake, its characterized in that:
the foundation structure is provided with vertical T-shaped compaction piles arranged in rows, the T-shaped compaction piles are divided into an upper part and a lower part, large-diameter piles are arranged in soil layers with large upper collapsible coefficients, small-diameter piles are arranged in soil layers with small lower collapsible coefficients, and the upper part and the lower part are coaxial cylinders and are of an integrated structure.
The T-shaped compaction piles are arranged in multiple rows and are arranged in a regular triangle, square or rectangle shape.
An improved soil cushion layer is arranged above the T-shaped compaction pile.
The improved soil cushion layer is filled with the soil.
The edges of the improved soil cushion layers on two sides of the filling are provided with longitudinal drainage ditches.
The drainage ditch is internally laid with a lime soil cushion layer, and the surface of the lime soil cushion layer is laid with a concrete block plate.
The construction method for treating the collapsible loess foundation structure by the T-shaped compaction piles is characterized by comprising the following steps of:
the method comprises the following steps:
the method comprises the following steps: cleaning and leveling a construction site, and removing surface soil with the thickness of 0.3 m;
step two: constructing a T-shaped compaction pile:
arranging pile positions, accurately determining the positions of pile holes and numbering the pile holes;
the pore-forming sequence is carried out from outside to inside at intervals, the pore-forming adopts the methods of immersed tube pore-forming, impact pore-forming and column hammer pore-forming, and the pile hole filler adopts lime soil or cement soil;
the hole forming machine is put in place, a lower small-diameter pile is constructed firstly, after the hole is formed to the required depth, the mixed qualified filler is filled into the pile hole layer by using a standard hopper or a material transporting vehicle, and the pile hole is tamped layer by layer;
after the construction of the lower small-diameter pile is completed, a large-diameter hole forming device is used for reaming, and the upper large-diameter pile is constructed;
the whole or the fragment pile is completely constructed, the upper 0.7m thick soil layer is removed, and the soil layer is rolled and leveled;
step three: cushion layer construction:
after the quality of the compacted pile is detected to be qualified, constructing a pile top cushion layer, wherein the thickness of the cushion layer is 1m, and the cushion layer is made of lime soil or cement soil;
step four: construction of a drainage ditch:
and 3m outside the filling slope toe is provided with a drainage ditch which is reinforced by a concrete block plate, and the bottom of the drainage ditch is provided with a 0.15m thick lime soil anti-seepage cushion layer.
The invention has the following advantages:
the method is practical, reasonable in technology, and investment-saving, can effectively solve the problem of collapsibility of the loess foundation, and enriches the collapsibility loess foundation treatment technology.
Drawings
FIG. 1 is a cross-sectional view of a collapsible loess foundation structure treated by a T-shaped compaction pile;
FIG. 2 is a layout view of T-shaped packing piles;
FIG. 3 is an elevation view of a T-shaped packing pile;
FIG. 4 is a view showing a drain structure.
In the figure, 1-soil layer with large collapse coefficient, 2-soil layer with small collapse coefficient, 3-drainage ditch, 4-filling, 5-T-shaped compaction pile, 6-large diameter pile, 7-small diameter pile, 8-improved soil cushion layer, 9-inter-pile soil, 10-concrete block plate and 11-lime soil cushion layer.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention relates to a collapsible loess foundation structure treated by T-shaped compaction piles, wherein vertical T-shaped compaction piles 5 which are arranged in rows are arranged in the foundation structure, the T-shaped compaction piles 5 are divided into an upper part and a lower part, large-diameter piles 6 are arranged in a soil layer 1 with a large upper collapsible coefficient, small-diameter piles 7 are arranged in a soil layer with a small lower collapsible coefficient, and the upper part and the lower part are coaxial cylinders and are of an integral structure.
The T-shaped compaction piles 5 are arranged in multiple rows and arranged in a regular triangle, square or rectangle. An improved soil cushion layer 8 is arranged above the T-shaped compaction piles 5. Above the improved soil mat layer 8 is a fill 4. The edges of the improved soil cushion layer 8 at both sides of the fill 4 are provided with longitudinal drainage ditches 3. The drainage ditch 3 is internally provided with a lime soil cushion layer 11, and the surface of the lime soil cushion layer 11 is provided with a concrete block plate 10.
The construction method for treating the collapsible loess foundation structure by using the T-shaped compaction pile comprises the following steps:
the method comprises the following steps: cleaning and leveling a construction site, and removing surface soil with the thickness of 0.3 m;
step two: constructing a T-shaped compaction pile:
arranging pile positions, accurately determining the positions of pile holes and numbering the pile holes;
the pore-forming sequence is carried out from outside to inside at intervals, the pore-forming adopts the methods of pipe sinking pore-forming, impact pore-forming and column hammer pore-forming, the pile hole filler adopts lime soil or cement soil, and the construction requirements of the conventional compaction pile construction are compounded;
the hole forming machine is put in place, a lower small-diameter pile is constructed firstly, after the hole is formed to the required depth, the mixed qualified filler is filled into the pile hole layer by using a standard hopper or a material transporting vehicle, and the pile hole is tamped layer by layer;
after the construction of the lower small-diameter pile is completed, a large-diameter hole forming device is used for reaming, and the upper large-diameter pile is constructed;
the whole or the fragment pile is completely constructed, the upper 0.7m thick soil layer is removed, and the soil layer is rolled and leveled;
step three: cushion layer construction:
after the quality of the compacted pile is detected to be qualified, constructing a pile top cushion layer, wherein the thickness of the cushion layer is 1m, and the cushion layer is made of lime soil or cement soil;
step four: construction of a drainage ditch:
and 3m outside the filling slope toe is provided with a drainage ditch which is reinforced by a concrete block plate, and the bottom of the drainage ditch is provided with a 0.15m thick lime soil anti-seepage cushion layer.
The T-shaped compaction pile is composed of two parts with different pile diameters, the upper part of the pile diameter is large, the lower part of the pile diameter is small, and the method is determined according to the following method:
(1) firstly, the diameter of pile holes and the distance between piles within the proposed compaction depth range are preliminarily calculated according to the traditional method.
(2) The stratum within the compaction depth range is manually divided into an upper layer and a lower layer, wherein the layer with larger collapsible coefficient is divided into one layer, and the layer with smaller collapsible coefficient is divided into the other layer.
(3) The pile spacing is a fixed value, and the diameters of the pile holes of the upper layer and the lower layer are respectively calculated and drawn up in a reverse mode according to a traditional method.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (7)
- The collapsible loess foundation structure is handled to T shape compaction stake, its characterized in that:vertical T-shaped compaction piles (5) arranged in rows are arranged in the foundation structure, the T-shaped compaction piles (5) are divided into an upper part and a lower part, large-diameter piles (6) are arranged in a soil layer (1) with a large upper collapsible coefficient, small-diameter piles (7) are arranged in a soil layer with a small lower collapsible coefficient, and the upper part and the lower part are coaxial cylinders and are of an integrated structure.
- 2. The T-shaped compaction pile processing collapsible loess foundation structure according to claim 1, wherein:the T-shaped compaction piles (5) are arranged in multiple rows and are arranged in a regular triangle, square or rectangle shape.
- 3. The T-shaped compaction pile processing collapsible loess foundation structure according to claim 2, wherein:an improved soil cushion layer (8) is arranged above the T-shaped compaction pile (5).
- 4. The T-shaped compaction pile processing collapsible loess foundation structure according to claim 3, wherein:the improved soil cushion layer (8) is provided with a filling (4) above.
- 5. The T-shaped compaction pile processing collapsible loess foundation structure according to claim 4, wherein:the edges of the improved soil cushion layers (8) at the two sides of the filling (4) are provided with longitudinal drainage ditches (3).
- 6. The T-shaped compaction pile processing collapsible loess foundation structure according to claim 5, wherein:a lime soil cushion layer (11) is laid in the drainage ditch (3), and a concrete block plate (10) is laid on the surface of the lime soil cushion layer (11).
- The construction method for treating the collapsible loess foundation structure by the T-shaped compaction piles is characterized by comprising the following steps of:the method comprises the following steps:the method comprises the following steps: cleaning and leveling a construction site, and removing surface soil with the thickness of 0.3 m;step two: constructing a T-shaped compaction pile:arranging pile positions, accurately determining the positions of pile holes and numbering the pile holes;the pore-forming sequence is carried out from outside to inside at intervals, the pore-forming adopts the methods of immersed tube pore-forming, impact pore-forming and column hammer pore-forming, and the pile hole filler adopts lime soil or cement soil;the hole forming machine is put in place, a lower small-diameter pile is constructed firstly, after the hole is formed to the required depth, the mixed qualified filler is filled into the pile hole layer by using a standard hopper or a material transporting vehicle, and the pile hole is tamped layer by layer;after the construction of the lower small-diameter pile is completed, a large-diameter hole forming device is used for reaming, and the upper large-diameter pile is constructed;the whole or the fragment pile is completely constructed, the upper 0.7m thick soil layer is removed, and the soil layer is rolled and leveled;step three: cushion layer construction:after the quality of the compacted pile is detected to be qualified, constructing a pile top cushion layer, wherein the thickness of the cushion layer is 1m, and the cushion layer is made of lime soil or cement soil;step four: construction of a drainage ditch:and 3m outside the filling slope toe is provided with a drainage ditch which is reinforced by a concrete block plate, and the bottom of the drainage ditch is provided with a 0.15m thick lime soil anti-seepage cushion layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010184945.9A CN111305250A (en) | 2020-03-17 | 2020-03-17 | Collapsible loess foundation structure treated by T-shaped compaction piles and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010184945.9A CN111305250A (en) | 2020-03-17 | 2020-03-17 | Collapsible loess foundation structure treated by T-shaped compaction piles and construction method |
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| CN111305250A true CN111305250A (en) | 2020-06-19 |
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| CN202010184945.9A Pending CN111305250A (en) | 2020-03-17 | 2020-03-17 | Collapsible loess foundation structure treated by T-shaped compaction piles and construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112030614A (en) * | 2020-09-14 | 2020-12-04 | 中铁二十一局集团第六工程有限公司 | Roadbed construction method based on large-thickness collapsible loess area column hammer impact pile extension and cement improved soil |
| CN113463618A (en) * | 2021-07-14 | 2021-10-01 | 安徽森通建设工程有限公司 | Foundation reinforcing method for constructional engineering |
| CN115262535A (en) * | 2022-01-21 | 2022-11-01 | 郑州航空工业管理学院 | Variable-cross-section soil-squeezing precast tubular pile and construction process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926303A (en) * | 2012-11-22 | 2013-02-13 | 河海大学 | Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use |
| JP2017101520A (en) * | 2015-12-04 | 2017-06-08 | 千代田工営株式会社 | Construction method of foundation pile having reinforced pile head |
| CN108797557A (en) * | 2018-09-12 | 2018-11-13 | 河南工业大学 | A kind of lime-soil compaction pile constructing process in Collapsible Loess District end of the bridge section |
| CN212375898U (en) * | 2020-03-17 | 2021-01-19 | 中铁第一勘察设计院集团有限公司 | Collapsible loess foundation structure is handled to T shape compaction stake |
-
2020
- 2020-03-17 CN CN202010184945.9A patent/CN111305250A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102926303A (en) * | 2012-11-22 | 2013-02-13 | 河海大学 | Method for reinforcing soft soil foundation settlement control pile foundation bracket of high-grade highway in use |
| JP2017101520A (en) * | 2015-12-04 | 2017-06-08 | 千代田工営株式会社 | Construction method of foundation pile having reinforced pile head |
| CN108797557A (en) * | 2018-09-12 | 2018-11-13 | 河南工业大学 | A kind of lime-soil compaction pile constructing process in Collapsible Loess District end of the bridge section |
| CN212375898U (en) * | 2020-03-17 | 2021-01-19 | 中铁第一勘察设计院集团有限公司 | Collapsible loess foundation structure is handled to T shape compaction stake |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112030614A (en) * | 2020-09-14 | 2020-12-04 | 中铁二十一局集团第六工程有限公司 | Roadbed construction method based on large-thickness collapsible loess area column hammer impact pile extension and cement improved soil |
| CN113463618A (en) * | 2021-07-14 | 2021-10-01 | 安徽森通建设工程有限公司 | Foundation reinforcing method for constructional engineering |
| CN115262535A (en) * | 2022-01-21 | 2022-11-01 | 郑州航空工业管理学院 | Variable-cross-section soil-squeezing precast tubular pile and construction process |
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