CN112575775A - Immersed tube cement soil mixing pile, construction process and immersed tube device - Google Patents
Immersed tube cement soil mixing pile, construction process and immersed tube device Download PDFInfo
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- CN112575775A CN112575775A CN202110094564.6A CN202110094564A CN112575775A CN 112575775 A CN112575775 A CN 112575775A CN 202110094564 A CN202110094564 A CN 202110094564A CN 112575775 A CN112575775 A CN 112575775A
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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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/126—Consolidating by placing solidifying or pore-filling substances in the soil and mixing by rotating blades
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- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a immersed tube cement soil mixing pile and a construction process and an immersed tube device, wherein the immersed tube device comprises an immersed tube and a grouting tube, the immersed tube comprises an inner tube and an outer tube, the upper end of the inner tube is flush with the upper end of the outer tube, the bottom end of the inner tube is higher than the bottom end of the outer tube, the bottom end of the inner tube is connected with the bottom end of the outer tube through a conical sealing plate, an annular supporting plate is arranged between the inner tube and the outer tube, and a mounting hole is formed in the annular supporting plate; the grouting pipe is arranged between the inner pipe and the outer pipe of the immersed pipe through the mounting hole; the lower end of the grouting pipe is provided with a 90-degree elbow; the invention limits the soil body to be stirred and the cement slurry in the immersed tube through the double-layer immersed tube, so that the soil body to be stirred and the cement slurry can be fully and uniformly mixed, and then, the grouting pipe is utilized to perform grouting on the interface of the pile body and the peripheral soil body in the process of extracting the immersed tube after the construction of the stirring pile body is finished, so that the quality uniformity of the pile body of the cement-soil stirring pile is improved, the compressive strength of the pile body is enhanced, the frictional resistance and the end resistance of the pile body are improved, and the bearing capacity of the cement-soil stirring pile can.
Description
Technical Field
The invention belongs to the technical field of foundation engineering, and relates to a pipe sinking cemented soil mixing pile, a construction process and a pipe sinking device.
Background
The cement soil mixing pile is commonly used for reinforcing various foundation soil layers which comprise silt, mucky soil, silt soil, sandy soil, peat soil and the like and have higher water content and lower foundation bearing capacity, and the principle of reinforcing the stratum lies in that: the cement is used as a curing agent, the special stirring equipment is utilized to forcibly stir and mix the soft soil and the curing agent in a certain depth in situ, and a series of physical and chemical reactions are generated between the reinforced soil body and the curing agent, so that the soil body is hardened into a high-quality pile body with integrity, water stability and certain strength, and the aim of improving the foundation is further achieved. Compared with a concrete filling pile, the cement mixing pile has the characteristics of material saving and simple construction process.
However, the cement-soil pile has the great defects that the vertical compression-resistant bearing capacity is low, the pile body strength is uneven, the difference of different parts is large, and even the pile is broken, which is mainly caused by that cement slurry injected into the cement-soil mixing pile is unevenly mixed with the mixed soil body and the cement slurry leaks in the construction process of the cement-soil mixing pile.
On the premise of giving full play to the advantage of lower cost of the cement-soil pile, in order to improve the compressive strength of the cement-soil pile, a pile forming method which is simple, effective and capable of enhancing the strength of the cement-soil pile and improving the bearing capacity of the cement-soil pile is urgently needed to be developed.
Disclosure of Invention
The invention aims to provide a pipe sinking cement soil mixing pile and a construction process thereof, and also provides a pile forming device thereof. The cement soil pile obtained by the process can effectively avoid the defects that the pile body of the traditional cement soil pile is weaker in strength and easy to break.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a pipe sinking device for a pipe sinking cemented soil mixing pile comprises a sinking pipe and a grouting pipe, wherein the sinking pipe comprises an inner pipe and an outer pipe, the upper end of the inner pipe is flush with the upper end of the outer pipe, the bottom end of the inner pipe is higher than the bottom end of the outer pipe, the bottom end of the inner pipe is connected with the bottom end of the outer pipe through a conical sealing plate, an annular supporting plate is further arranged between the inner pipe and the outer pipe, and a mounting hole is formed in the annular supporting plate; the grouting pipe is arranged between the inner pipe and the outer pipe of the immersed pipe through the mounting hole; the lower end of the grouting pipe is provided with a 90-degree elbow, and the 90-degree elbow bends to the outer pipe and is communicated with a grout outlet arranged on the outer pipe.
Evenly set up 4 mounting holes on the annular support plate, the slip casting pipe is 4, and 4 slip casting pipes are installed respectively in 4 mounting holes.
The annular supporting plate is 2, is the last annular supporting plate and the lower annular supporting plate that set up along immersed tube top-down respectively, go up annular supporting plate and set up in being close to inner tube upper end position, lower annular supporting plate sets up the bottom position at the inner tube.
The annular supporting plate and the conical sealing plate are both steel plates.
The immersed tube cement soil mixing pile prepared by the immersed tube device comprises a cement soil mixing pile core pile and an immersed tube cement slurry layer which is arranged around the core pile; the core pile of the cement soil mixing pile is divided into an upper section and a lower section, the lower section is a variable diameter section, the diameter of the upper part of the variable diameter section is consistent with that of the upper section, the diameter of the variable diameter section is gradually enlarged downwards along the axis of the core pile, and the included angle between the variable diameter section and the axis of the core pile is 3-5 degrees.
The cross section of the cement-soil mixing pile is circular, the cross section of the pipe sinking cement slurry layer is annular, and the thickness of the pipe sinking cement slurry layer is 20-30 mm.
The construction process for preparing the immersed tube cement soil mixing pile by using the immersed tube device comprises the following steps:
1) sinking the pipe into the soil: starting a pile driver pressurizing device to press the immersed tube device into the soil together according to the determined pile position until the designed elevation position is reached;
2) premixing and sinking: starting a stirring motor to enable the stirrer to cut the soil body to sink along the guide frame while stirring until the designed elevation position is reached;
3) spraying slurry, stirring and lifting: according to the designed speed, cement paste is sprayed while the stirring drill bit is rotated to lift;
4) and (3) repeatedly spraying, stirring, sinking and lifting: the stirring machine is rotated and sunk into the soil while spraying the cement paste to reach the elevation of the pile bottom, then the stirring machine is rotated and lifted out of the ground, and the operation is repeated for two to six times so as to uniformly stir the soft soil and the cement paste;
5) tube drawing and grouting: and (3) pulling out the immersed tube after the construction of the cement mixing pile is completed, and grouting the interface between the pile body of the cement mixing pile and the surrounding soil body through the grouting tube while pulling out the tube in the tube pulling process to form a cement slurry layer of the immersed tube.
In the construction process of the cement-soil pile, the soil body to be stirred and cement grout are limited in the immersed tube through the double-layer immersed tube, so that the soil body to be stirred and the cement grout can be fully and uniformly mixed, and then, grouting is performed on the interface of the pile body and the peripheral soil body by using the grouting tube in the process of pulling out the immersed tube after the construction of the stirring pile body is finished, so that a solidified cement grout layer with the thickness of about 30mm is formed on the periphery of the pile body, the strength of the solidified cement grout layer is higher than that of the cement soil body, and a hoop effect is generated on the pile; and on the other hand, grouting can fill gaps of soil around the pile body, so that the compactness of the soil is increased, and the frictional resistance between the pile body and the soil and the end resistance of the soil at the pile end are improved. Therefore, the method can effectively improve the quality uniformity of the pile body of the cement soil mixing pile, enhance the compressive strength of the pile body, improve the frictional resistance and the end resistance of the pile body and obviously improve the bearing capacity of the cement soil mixing pile.
Specifically, compared with the prior art, the invention has the technical effects that:
1) the immersed tube is arranged on the outer side of the cement soil pile, so that the stirred soil body and cement slurry can be fully and uniformly mixed in a limited space, the strength uniformity of the pile body is ensured, the compressive strength of the cement soil pile is improved, and the bearing capacity of the pile is further improved;
2) in the process of pressing the immersed tube into the soil body, the soil body inside and outside the tube is subjected to a certain horizontal compaction effect, so that the density of the pile body inside the tube is improved on one hand, the lateral resistance of the soil body outside the pile is improved on the other hand, and the bearing capacity of the pile is improved;
3) grouting is carried out between the pile body and the surrounding soil body interface through the grouting pipe in the pipe drawing process, so that the combination degree of the pile body, the pile bottom and the pile side soil body is improved, the side resistance and the end resistance of the pile are further improved, and the bearing capacity of the pile is enhanced;
4) the length of the outer pipe of the immersed tube is longer than that of the inner pipe, so that the bottom end of the immersed tube forms a tip, the immersed tube operation is more favorable, and on the other hand, the lower section of the obtained cement soil mixing pile is an expanded section, so that the bearing capacity of a pile foundation is further improved.
Drawings
FIG. 1 is a schematic structural view of a sinking pipe apparatus according to the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a schematic structural view of the pipe-sinking soil-cement mixing pile according to the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples.
As shown in fig. 1 and 2, the pipe sinking device for the pipe sinking cemented soil mixing pile comprises a sinking pipe 1 and a grouting pipe 2, wherein the sinking pipe 1 comprises an inner pipe 11 and an outer pipe 12, the upper end of the inner pipe 11 is flush with the upper end of the outer pipe 12, the bottom end of the inner pipe 11 is higher than the bottom end of the outer pipe, the bottom end of the inner pipe 11 is connected with the bottom end of the outer pipe through a conical sealing plate 5, an annular supporting plate 3 is further arranged between the inner pipe 11 and the outer pipe 12, and a mounting hole 4 is formed in the annular supporting plate 3; evenly set up 4 mounting holes 4 on the annular support plate 3, slip casting pipe 2 is 4, and 4 slip casting pipes 2 are installed respectively in 4 mounting holes 4. Annular support plate 3 is 2, is the upper annular support plate 31 and the lower annular support plate 32 that set up along immersed tube 1 top-down respectively, upper annular support plate 31 sets up and is being close to inner tube 11 upper end position, and lower annular support plate 32 sets up the bottom position at inner tube 11. The annular supporting plate 3 and the conical sealing plate 5 are both steel plates.
The grouting pipe 2 is arranged between an inner pipe 11 and an outer pipe 12 of the immersed tube 1 through the mounting hole 4; the lower end of the grouting pipe 2 is provided with a 90-degree elbow 21, and the 90-degree elbow 21 bends towards the outer pipe 12 and is communicated with a grout outlet 13 arranged on the outer pipe 12.
The pipe-sinking soil-cement mixing pile 6 prepared by the pipe-sinking device comprises a soil-cement mixing pile core pile 61 and a pipe-sinking cement slurry layer 62 which is arranged around the core pile 61 as shown in figure 2; the core pile 61 of the cement soil mixing pile is divided into an upper section and a lower section, the lower section is a straightening warp section 63, the diameter of the upper part of the straightening warp section 63 is consistent with that of the upper section, the diameter of the straightening warp section 63 is gradually enlarged downwards along the axis of the core pile, and the included angle between the straightening warp section 63 and the axis of the core pile is 3-5 degrees. The cross section of the cement mixing pile is circular, the cross section of the pipe sinking cement slurry layer is annular, and the thickness of the pipe sinking cement slurry layer is 20-30 mm. The diameter of the outer pipe of the immersed tube cement paste layer is consistent with the maximum diameter of the reducer section of the cement-soil mixing pile core pile.
The construction process for preparing the immersed tube cement soil mixing pile by using the immersed tube device comprises the following specific steps:
1) preparation work: positioning and paying off according to a design drawing, and determining a pile position;
2) manufacturing a sinking pipe and a grouting pipe: the immersed tube is made of an inner seamless steel tube and an outer seamless steel tube, wherein the length of the outer tube 12 is 500mm longer than that of the inner tube 11, the inner diameter of the inner tube 11 is 20-30mm larger than that of the cement mixing pile 6, the inner diameter of the outer tube 12 is 50mm larger than that of the outer tube 11, the upper end of the inner tube 11 is flush with the outer tube 12, the upper end and the lower end of the inner tube 11 are connected with the outer tube 12 through annular steel plate supporting plates, and each annular steel plate supporting plate is provided with 4 mounting holes 4 for mounting; 4 grouting pipes 2 are arranged, are made of seamless steel pipes with the diameter of 12mm, are symmetrically distributed between the inner layer and the outer layer of the immersed tube 1 according to 90 degrees, are fixedly and firmly fixed with the annular steel plate supporting plate by electric welding, the lower end of each grouting pipe 2 is provided with a 90-degree elbow 21 towards the outer pipe, and a grout outlet 13 is formed in the side surface of the bottom end of the outer pipe 12;
3) the pile driver is in place: adding a pressure sinking pipe soil-entering device on the traditional cement mixing pile construction device to ensure the verticality of the guide frame of the pile machine and the ground;
4) sinking the pipe into the soil: starting a pile driver pressurizing device to press the immersed tube 1 and the grouting pipe 2 into the soil together according to the determined pile position until a designed elevation position (pile length) is reached;
5) premixing and sinking: starting a stirring motor to enable the stirrer to cut the soil body to sink along the guide frame while stirring until the designed elevation position is reached;
6) spraying slurry, stirring and lifting: spraying cement slurry at the speed of 0.5m/min, and rotating the stirring drill bit to lift;
7) and (3) repeatedly spraying, stirring, sinking and lifting: the stirring machine is rotated and sunk into the soil while spraying the cement paste to reach the elevation of the pile bottom, then the stirring machine is rotated and lifted out of the ground, and the operation is repeated for two to six times so as to uniformly stir the soft soil and the cement paste;
8) tube drawing and grouting: after the cement soil pile construction is completed, the immersed tube 1 is pulled out, and grouting is carried out between the pile body and the surrounding soil body interface through the grouting pipe while pulling the tube in the tube pulling process, so that the combination degree of the pile body, the pile bottom and the pile side soil body is improved, the side resistance and the end resistance of the pile are further improved, and the bearing capacity of the pile is enhanced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A pipe sinking device for a pipe sinking cemented soil mixing pile is characterized by comprising a sinking pipe and a grouting pipe, wherein the sinking pipe comprises an inner pipe and an outer pipe, the upper end of the inner pipe is flush with the upper end of the outer pipe, the bottom end of the inner pipe is higher than the bottom end of the outer pipe, the bottom end of the inner pipe is connected with the bottom end of the outer pipe through a conical sealing plate, an annular supporting plate is further arranged between the inner pipe and the outer pipe, and a mounting hole is formed in the annular supporting plate; the grouting pipe is arranged between the inner pipe and the outer pipe of the immersed pipe through the mounting hole; the lower end of the grouting pipe is provided with a 90-degree elbow, and the 90-degree elbow bends to the outer pipe and is communicated with a grout outlet arranged on the outer pipe.
2. A pipe sinking apparatus for a pipe sinking soil-cement mixing pile as claimed in claim 1, wherein 4 mounting holes are uniformly provided in said annular supporting plate, said number of grouting pipes is 4, and 4 grouting pipes are respectively mounted in the 4 mounting holes.
3. A pipe sinking apparatus for a pipe-sinking soil-cement mixing pile as claimed in claim 2, wherein said annular support plates are 2, an upper annular support plate and a lower annular support plate respectively disposed along the sinking pipe from top to bottom, said upper annular support plate being disposed at a position near an upper end of the inner pipe, and said lower annular support plate being disposed at a position near a lower end of the inner pipe.
4. A pipe sinking apparatus for a pipe-sinking cement-soil mixing pile as recited in any one of claims 1 to 3, wherein said annular support plate and said tapered closure plate are both steel plates.
5. A pipe sinking cement mixing pile prepared by the pipe sinking device of claim 1, which comprises a core pile of the cement mixing pile and a layer of pipe sinking cement slurry surrounding the core pile; the core pile of the cement soil mixing pile is divided into an upper section and a lower section, the lower section is a straightening channel section, the diameter of the upper part of the diameter changing section is consistent with that of the upper section, the diameter of the diameter changing section is gradually enlarged downwards along the axis of the core pile, and the included angle between the diameter changing section and the axis of the core pile is 3-5 degrees.
6. The immersed tube cement-soil mixing pile according to claim 5, wherein the cement-soil mixing pile is circular in cross section, the immersed tube cement-soil layer is annular in cross section, and the immersed tube cement-soil layer is 20-30mm thick.
7. The construction process for preparing a pipe-sinking cement mixing pile by using the pipe sinking device of claim 1, which is characterized by comprising the following steps:
1) sinking the pipe into the soil: starting a pile driver pressurizing device to press the pipe sinking device of claim 1 into the soil together according to the determined pile position until reaching a designed elevation position;
2) premixing and sinking: starting a stirring motor to enable the stirrer to cut the soil body to sink along the guide frame while stirring until the designed elevation position is reached;
3) spraying slurry, stirring and lifting: according to the designed speed, cement paste is sprayed while the stirring drill bit is rotated to lift;
4) and (3) repeatedly spraying, stirring, sinking and lifting: the stirring machine is rotated and sunk into the soil while spraying the cement paste to reach the elevation of the pile bottom, then the stirring machine is rotated and lifted out of the ground, and the operation is repeated for two to six times so as to uniformly stir the soft soil and the cement paste;
5) tube drawing and grouting: and (3) pulling out the immersed tube after the construction of the cement mixing pile is completed, and grouting the interface between the pile body of the cement mixing pile and the surrounding soil body through the grouting tube while pulling out the tube in the tube pulling process to form a cement slurry layer of the immersed tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110094564.6A CN112575775A (en) | 2021-01-25 | 2021-01-25 | Immersed tube cement soil mixing pile, construction process and immersed tube device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110094564.6A CN112575775A (en) | 2021-01-25 | 2021-01-25 | Immersed tube cement soil mixing pile, construction process and immersed tube device |
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| CN112575775A true CN112575775A (en) | 2021-03-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309128A (en) * | 2021-05-24 | 2021-08-27 | 北京建材地质工程有限公司 | Construction method of dumbbell-shaped cement soil curtain pile in peat soil stratum |
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2021
- 2021-01-25 CN CN202110094564.6A patent/CN112575775A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309128A (en) * | 2021-05-24 | 2021-08-27 | 北京建材地质工程有限公司 | Construction method of dumbbell-shaped cement soil curtain pile in peat soil stratum |
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