CN111364454A - Construction method of variable cross-section composite pile - Google Patents
Construction method of variable cross-section composite pile Download PDFInfo
- Publication number
- CN111364454A CN111364454A CN202010234121.8A CN202010234121A CN111364454A CN 111364454 A CN111364454 A CN 111364454A CN 202010234121 A CN202010234121 A CN 202010234121A CN 111364454 A CN111364454 A CN 111364454A
- Authority
- CN
- China
- Prior art keywords
- pile
- section
- variable cross
- mixing
- stirring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
-
- 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
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
Abstract
The invention discloses a construction method of a variable cross-section composite pile, which is suitable for treating soft soil foundation, and the construction operation comprises the following steps: a. leveling a field, and positioning a bidirectional mixing pile machine; b. the mixing pile machine drills downwards to spray and mix the soil body; c. lifting the mixing pile machine, and continuously mixing the cement soil to the ground surface or 50cm above the designed elevation; repeating the steps b and c to finish the lower pile body of the variable cross-section stirring pile; d. extending the blades of the stirrer, and constructing an enlarged head part of the stirring pile; e. completing the construction of the variable cross-section mixing pile; f. when the fabricated mixing pile with variable cross section is not hardened, the prefabricated pile with variable cross section and enlarged head is driven by vibration pipe sinking method in its center. The invention fully combines the diameter expanding technology of a single rigid pile and a stirring pile, has the dual advantages of a flexible section and a stiff composite pile, can effectively improve the bearing capacity of the pile body, increase the pile spacing, reduce the construction cost and has wide application prospect.
Description
Technical Field
The invention relates to a variable cross-section composite pile and a construction method thereof, which are suitable for soft soil foundation treatment and foundation engineering and belong to the technical field of civil engineering.
Background
Deep and soft soil is widely distributed in regions such as rivers, coasts and the like in China, and great challenges are brought to engineering construction. At present, the deep soft soil treatment mainly adopts cement soil mixing piles, reinforced concrete precast piles, cast-in-situ bored piles and other composite foundations and pile foundations. The cement soil mixing pile has the advantages of small construction disturbance, high speed and low cost, but has the defects of low pile body strength and difficulty in controlling the construction working medium quantity. Although the precast pile has higher strength and rigidity, when the ultimate bearing capacity is reached, the soil body around the pile is firstly damaged, the strength of the pile body is not fully exerted, and the economical efficiency is poor. The phenomena of hole collapse and necking are easy to occur in the construction process of the bored pile, the quality is difficult to control, and the application range of the bored pile is limited. Meanwhile, the traditional pile foundation and the pile foundation in the composite foundation engineering are all equal-section piles, and the upper load is mainly transmitted through pile side friction resistance and pile end resistance. In order to fully exert the side wall frictional resistance and the soil body compression resistance bearing capacity, in recent years, the technology of variable-section rigid piles and mixing piles is developed, such as the technology of support piles with expanded diameters in the middle, club-footed piles with expanded diameters at the bottom, variable-section mixing piles and the like, so that obvious effects are obtained, and the problems of low pile body strength and limited bearing capacity still exist.
The reinforced composite pile developed in recent years is formed by combining a cement-soil mixing pile (outer core) and a reinforced concrete precast pile (inner core), namely, inserting the reinforced concrete precast pile into a large-diameter cement-soil pile before the cement-soil pile is solidified and hardened. The stiffened composite pile can give full play to the advantages of high bearing capacity of the reinforced concrete precast pile and lateral friction resistance provided by the large-diameter cement-soil pile, avoids the defects of waste of strength of the reinforced concrete precast pile material, low strength of the section of the cement-soil pile body and the like, can obviously reduce the engineering cost, and has good economic benefit.
But the stiff composite pile still has the following problems in the soft foundation treatment:
(1) for the layering phenomenon existing in deep and soft soil stratum, if the layering foundation is processed according to the conventional equal-section stiff composite pile, the replacement rate of the pile bodies of different soil layers is the same. However, the soft soil layer is a main compression layer, and if the soft soil layer is designed according to the replacement rate of the soft soil layer, the replacement rate of pile bodies of other soil layers is higher, and resource waste is caused;
(2) the pile spacing of the traditional stiffness composite pile is small, the manufacturing cost is high, and the popularization and the application of the stiffness composite pile are influenced.
The invention provides a variable cross-section composite pile and a construction method thereof, aiming at the problems in the deep and soft soil foundation composite pile reinforcement technology, improving the form of a rigid composite pile, organically combining the design concepts of a variable cross-section stirring pile and the rigid composite pile and taking the dual advantages of the variable cross-section and the rigid composite pile.
Disclosure of Invention
The technical problem is as follows: aiming at the defects of the traditional stiffness composite pile in engineering application, the invention provides the variable cross-section composite pile and the construction method thereof, which effectively improve the resource utilization, reduce the construction cost and popularize the application range of the stiffness composite pile.
The technical scheme is as follows: the construction method of the variable cross-section composite pile mainly changes the inner core pile and the outer core pile of the traditional constant cross-section stiff composite pile into the variable cross-section cement soil pile and the precast pile. The specific construction operation steps of the variable cross-section composite pile are as follows:
a. leveling a field, positioning a bidirectional mixing pile machine: the variable cross-section cement soil mixing pile comprises a pile body at the lower part of the variable cross-section mixing pile and a pile body at the enlarged head part at the upper part of the mixing pile, and the pile positions are arranged in a quincunx shape or a square shape; suspending the bidirectional stirrer to an appointed pile position by using a crane and centering;
b. drilling, spraying and stirring: starting a stirrer drill rod and a pressurizing device of the bidirectional stirrer in sequence, drilling the pressurized stirrer drill rod downwards along a guide frame, starting a guniting device after the bottommost rotary blade of a drill bit at the end part of the stirrer drill rod completes soil cutting and soil entering, stirring by the middle rotary blade, and pressing by the uppermost rotary blade; the bidirectional mixing pile machine continuously drills and mixes the cement soil until the design depth;
c. lifting and stirring: lifting the bidirectional stirrer, and continuously stirring the cement soil to the ground surface or 50cm above the designed elevation; repeating the steps b and c to finish the lower pile body of the variable cross-section stirring pile;
d. and (3) constructing the enlarged head part of the mixing pile: stopping the stirring blade at the designed part of the expanded head, closing the guniting device, starting a telescopic switch of the stirring blade, extending the stirring blade to the designed length, and repeating the steps b and c to complete the construction of the pile body part of the expanded head part at the upper part of the stirring pile;
e. completing the construction of the variable cross-section mixing pile;
f. pile pressing of the variable cross-section reinforced concrete precast pile: when the fabricated variable cross-section mixing pile is not hardened, driving a variable cross-section reinforced concrete precast pile to the designed depth by a vibration pipe sinking method at the center of the fabricated variable cross-section mixing pile;
g. and finishing the construction of the variable cross-section composite pile.
The stirring blades are telescopic stirring blades.
The lower pile body of the variable cross-section mixing pile and the upper enlarged head part of the mixing pile are formed into a whole, the upper part of the mixing pile is thick, the lower part of the mixing pile is thin, and concrete is poured into the mixing pile.
The variable cross-section reinforced concrete precast pile is composed of two parts, and the lower half section is thinner than the upper half section.
The variable cross-section composite pile consists of a lower pile body of a variable cross-section stirring pile, an upper expanded head part pile body of the stirring pile and a variable cross-section reinforced concrete precast pile, wherein the lower half section of the variable cross-section reinforced concrete precast pile is positioned in the lower pile body of the variable cross-section stirring pile, and the upper half section of the variable cross-section reinforced concrete precast pile is positioned in the upper expanded head part pile body of the stirring pile.
Has the advantages that: the method has the advantages of convenient construction and simple operation, and mainly comprises the following steps:
(1) pile-forming parameters with different diameter-changing ratios (the ratio of the diameter of the enlarged pile body to the original diameter) and diameter-changing heights are selected according to different stratums, and the enlarged parts can effectively improve the bearing capacity of the pile body and increase the pile spacing;
(2) for flexible load, the expansion head can better exert the soil arch effect, improve the load sharing proportion of the pile body and reduce the settlement of the composite foundation;
(3) compared with the constant-section stiff composite pile, the construction cost is effectively reduced, and the application of the stiff composite pile is popularized.
Drawings
Fig. 1 is a flow chart of a construction process of a variable cross-section composite pile. The power transmission device 1 is shown; a blender drill rod 2; a retractable stirring blade 3; a lower pile body 4 of the variable cross-section mixing pile; a pile body 5 of the expanded head part at the upper part of the mixing pile; vibrating the immersed tube pile pressing device 6; a variable cross-section reinforced concrete precast pile 7; and (4) the variable cross-section composite pile 8.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the embodiments.
Example 1:
the invention discloses a variable cross-section composite pile and a construction method thereof, and is shown in figure 1. Comprises the following steps:
a. leveling a field, positioning a bidirectional mixing pile machine: the pile positions of the variable cross-section cement soil mixing pile are arranged in a quincunx or square shape; suspending the bidirectional stirrer to an appointed pile position by using a crane and centering;
b. drilling, spraying and stirring: starting a drill rod and a pressurizing device in sequence, drilling the pressurized drill rod downwards along a guide frame, extending a stirring blade to be 800mm (the diameter of a pile body at the lower part of the variable cross-section stirring pile is 800-1200 mm in common, and the pile diameter of 800mm is selected in the embodiment), starting a guniting device after the bottommost rotating blade of a drill bit at the end part of the drill rod finishes soil cutting and soil penetration, stirring by a middle rotating blade, and pressing by the uppermost rotating blade; the bidirectional mixing pile machine continuously drills and mixes the cement soil until the design depth;
c. lifting and stirring: lifting the mixing pile machine, and continuously mixing the cement soil to the ground surface or 50cm above the designed elevation; repeating the steps b and c to finish the lower pile body of the variable cross-section stirring pile;
d. and (3) constructing the enlarged head part of the mixing pile: stopping the stirring blade at the designed part of the expanded head, closing the guniting device, starting a telescopic switch of the stirring blade, extending the stirring blade to 1200mm (the general diameter ratio of the variable diameter is 1.5-2, 1.5 is selected in the embodiment), repeating the steps b and c, and completing construction of the expanded head part of the stirring pile, wherein the construction height of the expanded head part is 2m (the general diameter ratio of the variable diameter is 2-5 m, and 2m is selected in the embodiment);
e. completing the construction of the variable cross-section mixing pile;
f. pile pressing of the variable cross-section precast pile: when the fabricated variable-section cement-soil mixing pile is not hardened, driving a variable-section precast tubular pile to a designed depth (the precast pile can be a tubular pile, the diameter of the tubular pile is usually 300-800 mm, the diameter of the 500mm pile is selected in the embodiment) by using a vibration pipe sinking method at the center of the pile, wherein the diameter of the expanded head part is 750mm (the diameter ratio of the variable diameter is usually 1.5-2, the diameter of the variable diameter is 1.5 in the embodiment), and the variable diameter height is 2m (the variable diameter height is usually 2-5 m, and the diameter of the variable diameter height is 2m in the embodiment);
g. completing the construction of the variable cross-section composite pile;
example 2:
a variable cross-section composite pile and a construction method thereof, as shown in figure 1. Comprises the following steps:
a. leveling a field, positioning a bidirectional mixing pile machine: the pile positions of the variable cross-section cement soil mixing pile are arranged in a quincunx or square shape; suspending the bidirectional stirrer to an appointed pile position by using a crane and centering;
b. drilling, spraying and stirring: starting a drill rod and a pressurizing device in sequence, drilling the pressurized drill rod downwards along a guide frame, extending a stirring blade to be 800mm (the diameter of a pile body at the lower part of the variable cross-section stirring pile is 800-1200 mm in common, and the pile diameter of 800mm is selected in the embodiment), starting a guniting device after the bottommost rotating blade of a drill bit at the end part of the drill rod finishes soil cutting and soil penetration, stirring by a middle rotating blade, and pressing by the uppermost rotating blade; the bidirectional mixing pile machine continuously drills and mixes the cement soil until the design depth;
c. lifting and stirring: lifting the mixing pile machine, and continuously mixing the cement soil to the ground surface or 50cm above the designed elevation; repeating the steps b and c to finish the lower pile body of the variable cross-section stirring pile;
d. and (3) constructing the enlarged head part of the mixing pile: stopping the stirring blade at the designed part of the expanded head, closing the guniting device, starting a telescopic switch of the stirring blade, extending the stirring blade to 1200mm (the general diameter ratio of the variable diameter is 1.5-2, 1.5 is selected in the embodiment), repeating the steps b and c, and completing construction of the expanded head part of the stirring pile, wherein the construction height of the expanded head part is 3m (the general diameter ratio of the variable diameter is 2-5 m, and 3m is selected in the embodiment);
e. completing the construction of the variable cross-section mixing pile;
f. pile pressing of the variable cross-section precast pile: when the fabricated variable-section cement-soil mixing pile is not hardened, driving a variable-section precast tubular pile to a designed depth (the precast pile can be a tubular pile, the diameter of the tubular pile is usually 300-800 mm, the diameter of the 500mm pile is selected in the embodiment) by using a vibration pipe sinking method at the center of the pile, wherein the diameter of the expanded head part is 750mm (the diameter ratio of the variable diameter is usually 1.5-2, the diameter of the variable diameter is 1.5 in the embodiment), and the variable diameter height is 3m (the variable diameter height is usually 2-5 m, and the diameter of the variable diameter is 3m in the embodiment);
g. completing the construction of the variable cross-section composite pile;
example 3:
a variable cross-section composite pile and a construction method thereof, as shown in figure 1. The method is characterized by comprising the following steps:
a. leveling a field, positioning a bidirectional mixing pile machine: the pile positions of the variable cross-section cement soil mixing pile are arranged in a quincunx or square shape; suspending the bidirectional stirrer to an appointed pile position by using a crane and centering;
b. drilling, spraying and stirring: starting a drill rod and a pressurizing device in sequence, drilling the pressurized drill rod downwards along a guide frame, extending a stirring blade to be 800mm (the diameter of a pile body at the lower part of the variable cross-section stirring pile is 800-1200 mm in common, and the pile diameter of 800mm is selected in the embodiment), starting a guniting device after the bottommost rotating blade of a drill bit at the end part of the drill rod finishes soil cutting and soil penetration, stirring by a middle rotating blade, and pressing by the uppermost rotating blade; the bidirectional mixing pile machine continuously drills and mixes the cement soil until the design depth;
c. lifting and stirring: lifting the mixing pile machine, and continuously mixing the cement soil to the ground surface or 50cm above the designed elevation; repeating the steps b and c to finish the lower pile body of the variable cross-section stirring pile;
d. and (3) constructing the enlarged head part of the mixing pile: stopping the stirring blade at the designed part of the expanded head, closing the guniting device, starting a telescopic switch of the stirring blade, extending the stirring blade to 1600mm (the general diameter ratio of the variable diameter is 1.5-2, and 2 is selected in the embodiment), repeating the steps b and c, and completing construction of the expanded head part of the stirring pile, wherein the construction height of the expanded head part is 2m (the general diameter ratio of the variable diameter is 2-5 m, and 2m is selected in the embodiment);
e. completing the construction of the variable cross-section mixing pile;
f. pile pressing of the variable cross-section precast pile: when the fabricated variable-section cement-soil mixing pile is not hardened, driving a variable-section precast tubular pile to a designed depth (the precast pile can be a tubular pile, the diameter of the tubular pile is usually 300-800 mm, the diameter of the 500mm pile is selected in the embodiment) by using a vibration pipe sinking method at the center of the pile, wherein the diameter of the expanded head part is 750mm (the diameter ratio of the variable diameter is usually 1.5-2, the diameter of the variable diameter is 1.5 in the embodiment), and the variable diameter height is 2m (the variable diameter height is usually 2-5 m, and the diameter of the variable diameter height is 2m in the embodiment);
g. completing the construction of the variable cross-section composite pile;
it should be noted that the foregoing is only a preferred embodiment of the present invention; it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. A construction method of a variable cross-section composite pile is characterized by comprising the following steps:
a. leveling a field, positioning a bidirectional mixing pile machine: the variable cross-section cement soil mixing pile comprises a lower pile body (4) of the variable cross-section mixing pile and an upper enlarged head part pile body (5) of the mixing pile, and the pile positions are arranged in a quincunx or square shape; suspending the bidirectional stirrer to an appointed pile position by using a crane and centering;
b. drilling, spraying and stirring: the method comprises the following steps that a blender drill rod (2) and a pressurizing device of a bidirectional blender are started in sequence, the pressurized blender drill rod (2) drills downwards along a guide frame, when a bottommost rotary blade of a drill bit at the end part of the blender drill rod (2) finishes soil cutting and soil entering, a guniting device is started, a middle rotary blade conducts stirring, and a topmost rotary blade conducts material pressing; the bidirectional mixing pile machine continuously drills and mixes the cement soil until the design depth;
c. lifting and stirring: lifting the bidirectional stirrer, and continuously stirring the cement soil to the ground surface or 50cm above the designed elevation; repeating the steps b and c to finish the lower pile body (4) of the variable cross-section stirring pile;
d. and (3) constructing the enlarged head part of the mixing pile: stopping the stirring blade (3) at the designed part of the expanded head, closing the guniting device, starting a telescopic switch of the stirring blade, extending the stirring blade (3) to the designed length, repeating the steps b and c, and completing construction of the pile body (5) part of the expanded head part at the upper part of the stirring pile;
e. completing the construction of the variable cross-section mixing pile;
f. pile pressing of the variable cross-section reinforced concrete precast pile: when the fabricated variable cross-section mixing pile is not hardened, a vibration pipe sinking method is used for driving the variable cross-section reinforced concrete precast pile (7) to the designed depth in the center of the fabricated variable cross-section mixing pile;
g. and finishing the construction of the variable cross-section composite pile.
2. The construction method of the variable cross-section composite pile according to claim 1, wherein the stirring blades (3) are retractable stirring blades.
3. The construction method of the variable cross-section composite pile according to claim 1, wherein the lower pile body (4) of the variable cross-section mixing pile and the upper enlarged head part pile body (5) of the mixing pile are formed into a whole, the upper part is thick, the lower part is thin, and concrete is poured into the inside.
4. The construction method of the composite pile with the variable cross-section according to claim 1, wherein the precast reinforced concrete pile (7) with the variable cross-section is composed of two parts, and the lower half section is thinner than the upper half section.
5. The construction method of the variable cross-section composite pile according to claim 1, wherein the variable cross-section composite pile (8) is composed of a variable cross-section mixing pile lower part pile body (4), a mixing pile upper part enlarged head part pile body (5) and a variable cross-section reinforced concrete precast pile (7), the lower half section of the variable cross-section reinforced concrete precast pile (7) is positioned in the variable cross-section mixing pile lower part pile body (4), and the upper half section of the variable cross-section reinforced concrete precast pile (7) is positioned in the mixing pile upper part enlarged head part pile body (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010234121.8A CN111364454A (en) | 2020-03-30 | 2020-03-30 | Construction method of variable cross-section composite pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010234121.8A CN111364454A (en) | 2020-03-30 | 2020-03-30 | Construction method of variable cross-section composite pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111364454A true CN111364454A (en) | 2020-07-03 |
Family
ID=71206927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010234121.8A Pending CN111364454A (en) | 2020-03-30 | 2020-03-30 | Construction method of variable cross-section composite pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111364454A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115162377A (en) * | 2022-07-28 | 2022-10-11 | 四川公路桥梁建设集团有限公司 | Variable-section combined slide-resistant pile with upper part and lower part being circular and construction method thereof |
| CN115198734A (en) * | 2022-07-19 | 2022-10-18 | 广东广晟南方建设有限公司 | Large-size CFG pile structure in municipal soft soil zone and energy-saving construction method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632234A (en) * | 2004-12-23 | 2005-06-29 | 东南大学 | Nail type cement soil stirring pile operation method |
| JP2008297752A (en) * | 2007-05-30 | 2008-12-11 | Taisei Corp | Pile burying method |
| CN101608448A (en) * | 2009-07-28 | 2009-12-23 | 武汉高铁桩工科技有限公司 | Cement paste spraying multi-directional core entraining agitation pile piling method |
| CN102561332A (en) * | 2012-02-09 | 2012-07-11 | 东南大学 | Continuous variable-diameter cement-soil mixed pile forming method |
-
2020
- 2020-03-30 CN CN202010234121.8A patent/CN111364454A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632234A (en) * | 2004-12-23 | 2005-06-29 | 东南大学 | Nail type cement soil stirring pile operation method |
| JP2008297752A (en) * | 2007-05-30 | 2008-12-11 | Taisei Corp | Pile burying method |
| CN101608448A (en) * | 2009-07-28 | 2009-12-23 | 武汉高铁桩工科技有限公司 | Cement paste spraying multi-directional core entraining agitation pile piling method |
| CN102561332A (en) * | 2012-02-09 | 2012-07-11 | 东南大学 | Continuous variable-diameter cement-soil mixed pile forming method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198734A (en) * | 2022-07-19 | 2022-10-18 | 广东广晟南方建设有限公司 | Large-size CFG pile structure in municipal soft soil zone and energy-saving construction method thereof |
| CN115162377A (en) * | 2022-07-28 | 2022-10-11 | 四川公路桥梁建设集团有限公司 | Variable-section combined slide-resistant pile with upper part and lower part being circular and construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106087999B (en) | It is a kind of to stir the constructing device and its construction method for spraying expanding reinforcing pile | |
| CN106996105B (en) | Down-the-hole impact jet grouting stirring pile construction technology and equipment | |
| CN105887876A (en) | Construction method for cast-in-situ large-diameter combined thin-wall threaded pipe pile and pile forming device of cast-in-situ large-diameter combined thin-wall threaded pipe pile | |
| CN103774644B (en) | A kind of construction method of drainage cement mixing method | |
| CN105604001A (en) | Stiffening core cement-soil tubular pile, construction method and cylindrical rotary stirring drilling tool | |
| CN111364454A (en) | Construction method of variable cross-section composite pile | |
| CN111764404A (en) | Partially recyclable secant pile supporting structure and construction method | |
| CN104863132A (en) | Bougainvillea spectabilis willd-shaped cement-soil mixing pile and shaping method thereof | |
| CN111472688B (en) | Self-drilling type pipe column supporting device and method thereof | |
| CN105113488B (en) | Construction method of multi-head minor-diameter long-spiral drilling machine in cast-in-situ major-diameter tubular pile | |
| CN102605773A (en) | Construction method of slip-casting expanded-base cast-in-situ bored pile and extruding-extending device thereof | |
| CN202450517U (en) | Large cross-section tube-sinking cast-in-place concrete post pressure-grouting hollow square pile | |
| CN101560766A (en) | Grid-like underground continuous wall plate and production method thereof | |
| CN102535446B (en) | Large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile and production method thereof | |
| JP3242356U (en) | Composite pile foundation structure to fix the quicksand layer | |
| CN208363088U (en) | A kind of changeable diameter high-pressure rotary jet grouting pile of applicable Deep Thick Soft Ground-changeable diameter DJM pile compound foundation structure | |
| CN110331936B (en) | Combined drilling bottom-expanding pile-planting construction method | |
| CN111636420A (en) | Construction equipment and construction method of anti-necking sinking pipe cast-in-place pile | |
| CN111877386A (en) | Wedge-shaped composite pile and construction method thereof | |
| CN111877324A (en) | Expanded-base composite pile and construction method thereof | |
| CN208251078U (en) | A kind of bottom-expanding sinking-pipe pilework | |
| CN208363084U (en) | A kind of NEW TYPE OF COMPOSITE pile foundation with higher level bearing capacity | |
| CN208363087U (en) | A kind of changeable diameter high-pressure rotary jet grouting pile foundation structure of applicable deep soft soil foundation | |
| CN104863125A (en) | Bougainvillea spectabilis willd-shaped drilling pile and shaping method thereof | |
| CN111636419A (en) | Construction equipment and construction method for grouting thin-wall tubular pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200703 |