CN210031788U - Bag reducing pile - Google Patents

Bag reducing pile Download PDF

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Publication number
CN210031788U
CN210031788U CN201920340212.2U CN201920340212U CN210031788U CN 210031788 U CN210031788 U CN 210031788U CN 201920340212 U CN201920340212 U CN 201920340212U CN 210031788 U CN210031788 U CN 210031788U
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China
Prior art keywords
bag
pile
reducing
main
reducing pile
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CN201920340212.2U
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Inventor
裘黎英
项鹏飞
尚玲丽
应海敏
张益栋
付旻
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Lancheng Leju Construction Management Group Co Ltd
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Lancheng Leju Construction Management Group Co Ltd
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Abstract

The utility model discloses a bag reducing pile, which comprises a bag reducing pile main body arranged in a hollow cavity structure, wherein a plurality of hole sections are arranged on the bag reducing pile main body at intervals along the axial direction, bags are fixed outside the hole sections, a plurality of injection holes for injecting sprayed concrete into the bags are arranged on the hole sections, and the injection holes are respectively communicated with the bags and the inside of the bag reducing pile main body; the lower end of the main body of the bag reducing pile is provided with a sealing plate. The main body of the bag reducing pile is a prefabricated hollow pile, and the shearing resistance of the pile is effectively improved after the hollow cavity and the bag are filled with the sprayed concrete; after the injection concrete is filled in the bag, the diameter expansion is formed, and the diameter-variable pile is formed by adopting a field pouring mode, so that the vertical bearing capacity is effectively improved compared with other types of piles with the same specification; the bag reducing pile does not need to be punched and then grouted in advance, and compared with the traditional reducing pile which is punched and then grouted, the bag reducing pile does not have any hole collapse risk.

Description

Bag reducing pile
Technical Field
The utility model belongs to the technical field of the ground reinforcement engineering, in particular to bag reducing pile is applicable to the reinforcement of weak soil foundation.
Background
The improvement is opened for 40 years, the economic construction of China is rapidly developed, a plurality of high-rise buildings are pulled out, and the construction of various urban infrastructures is gradually completed. The civil engineering industry, one of the major support industries of national economy, meets with a good opportunity of unprecedented development.
Particularly, the development speed is more rapid in economically developed coastal areas and inland plain areas. However, most coastal areas and inland plain areas are soft soil foundations, and in construction and development, if the soft soil foundations are encountered, the soft soil foundations must be treated. According to different practical conditions of a construction site, different methods are needed to reinforce the soft soil foundation.
Therefore, it is necessary to continuously improve and create a new soft soil foundation treatment method, thereby improving the quality of the project and bringing great economic benefits to the project.
Chinese patent literature (publication date: 6/8/2018, publication number: CN 106013132B) discloses a variable-diameter combined pile, which is formed by 2-3 reinforced concrete piles, wherein a variable-diameter pile body with gradually increased length and gradually decreased diameter is formed from top to bottom, and one or combination of ① cement soil piles, ② carriers and ③ carriers is selected at the bottom end of the pile on the basis of the variable-diameter pile body, so that the variable-diameter combined pile with various changes is formed.
Chinese patent literature (Announcement date: 6/13/2017, Announcement number: CN 106836211A) discloses a prefabricated club-footed reducing pile for treating soft soil foundation and a construction method thereof, wherein the side surface of the prefabricated club-footed reducing pile is wrapped with carbon fiber cloth, the diameter expansion part of the prefabricated club-footed reducing pile is shaped, the diameter reduction part of the prefabricated club-footed reducing pile is sleeved with a steel sleeve, and two super-strong PVC pipes are inserted at the diameter expansion part of the prefabricated club-footed reducing pile. The prefabricated club-footed reducing pile is driven into the designed depth for electro-osmosis consolidation, and 0.25 percent of NaCl solution is poured through the super-strong PVC pipe in the electro-osmosis process. By adopting the prefabricated club-footed variable diameter pile and the construction method thereof, the defect of poor pile forming quality of the cast-in-place variable diameter pile can be overcome; the reducing pile is integrally cylindrical, so that the soil resistance borne by the pile can be reduced during pile sinking, and the pile sinking speed is improved; 0.25% NaCl solution is poured through the super-strong PVC pipe in the electroosmosis process, so that the electroosmosis consolidation efficiency can be improved; the prefabricated bottom-expanding variable-diameter pile has the advantages that the pile bottom is expanded, and the pile end is implanted into the bearing layer, so that larger pile end bearing capacity can be provided.
Chinese patent literature (Announcement date: 9/4/2018, Announcement number: CN 108487268A) discloses a square hollow stepped variable-diameter slide-resistant pile structure and a construction method, wherein the slide-resistant pile structure consists of five sections from top to bottom, and comprises a first pile section (1), a second pile section (2), a third pile section (3), a fourth pile section (4) and a fifth pile section (5). The third pile body section has the longest side length and the largest cross-sectional area; and then sequentially reducing the diameter of the pile body towards the pile top and the pile bottom step by step with gradually reduced side length, wherein two adjacent sections are connected by a variable cross section. The second pile body section (2) to the fourth pile body section (4) are of a pile body hollow section (6) structure. The anti-slide pile structure of the utility model has strong bending resistance, shearing resistance and shearing resistance, the cross section area of the middle section of the pile body is obviously increased, and the anti-slide pile structure has stronger anti-slide capability; the utility model discloses the building materials are practiced thrift to friction pile structure, and reduce cost can practice thrift building materials such as muddy earth 40% -70% under the same resistance to compression, bending resistance, ability numerical value that shears, and economic benefits is obvious.
Although the technical scheme also relates to the technology of the variable diameter piles, the variable diameter piles in the prior art are complex in operation, time-consuming, labor-consuming and high in cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can effectively consolidate soft soil foundation for solving among the prior art reducing pile operation complicacy, waste time and energy, problem such as with high costs, and convenient operation is swift moreover, labour saving and time saving's bag reducing pile.
The utility model discloses realize that the technical scheme that its technical purpose adopted is: a bag reducing pile comprises a bag reducing pile body which is arranged in a hollow cavity structure, wherein a plurality of hole sections are axially arranged on the bag reducing pile body at intervals, bags are fixed outside the hole sections, a plurality of injection holes for injecting sprayed concrete into the bags are formed in the hole sections, and the injection holes are respectively communicated with the bags and the inside of the bag reducing pile body; the lower end of the main body of the bag reducing pile is provided with a sealing plate. This bag reducing pile, be provided with the hole section of taking the filling hole through the interval on bag reducing pile main part, bag in the external fixation of hole section, the hollow cavity and the bag of bag reducing pile main part pass through the filling hole intercommunication, when using this bag reducing pile, implant this bag reducing pile in the soil body of the soft soil foundation of treating the reinforcement, pour into shotcrete into bag reducing pile main part, shotcrete pours into the bag through the filling hole under the effect of high-power pump into, the bag can be protruding to the outside after pouring into shotcrete into, until the bag is filled with shotcrete, shotcrete in the bag solidifies integratively with the inside shotcrete of bag reducing pile main part and bag reducing pile main part cavity this moment, form bag reducing pile. The main body of the bag type variable-diameter pile is a prefabricated hollow pile, and the shearing resistance of the pile can be effectively improved after the hollow part is filled with sprayed concrete; after the injection concrete is filled in the bag, the diameter is expanded, and the vertical bearing capacity is greatly improved; compared with the traditional variable diameter pile which is punched and then grouted, the bag variable diameter pile has the advantages of no hole collapse risk and the like; and the operation is convenient, time-saving and labor-saving.
Preferably, the main body of the bag reducing pile is a prefabricated hollow pile; the diameter of the hole section is smaller than or equal to that of the main body of the reducing pile of the bag. The bag type reducing pile body is prefabricated into a hollow pile preferentially, is manufactured in advance and is light and convenient to transport, and meanwhile, the design requirement of bag type reducing is met. The diameter of hole section slightly is less than or equal to the diameter of bag reducing stake main part and can guarantee the setting of bag for the bag is fixed as an organic whole and can not take place the displacement with bag reducing stake main part all the time when implanting in the soil matrix, thereby has protected the requirement of bag reducing stake design use, can reach better anti-shear ability and bearing capacity.
Preferably, the spacing distance between two adjacent hole sections is 3-5 m. The spacing distance of the hole sections can be determined according to design requirements, and the bearing capacity and the shearing resistance of the pile can be improved as much as possible. The injection hole can be a through hole or an inner flaring type horn hole and is designed into the inner flaring type horn hole, and the aim is to enable the sprayed turbid concrete to be injected into the bag more quickly and effectively under the action of a high-power pump, so that the operation efficiency is further improved.
Preferably, the diameter of the injection hole is 5-8 cm. The diameter of the injection hole is designed to meet the requirements that the sprayed concrete can be injected into the bag, and the injection speed requirement is also met to control the solidification speed of the sprayed concrete and the like.
Preferably, the capsular bag is fixedly connected with the variable diameter pile body of the capsular bag through a group of fasteners. The bag is preferably made of an impermeable material, such as impermeable geotextile, so that the sprayed concrete injected into the bag can be guaranteed to bulge the bag to form the reducing diameter, and meanwhile, the sprayed concrete can be guaranteed not to leak, thereby guaranteeing that the sprayed concrete and the bag reducing main body can finally form an integral reducing pile with the same quality, and guaranteeing the shearing resistance and the bearing capacity. Meanwhile, the cost is low, and the environment is protected.
Preferably, the fastening piece comprises a steel wire and a sealing rubber gasket which are arranged at the upper end and the lower end of the bag, and a binding belt arranged in the middle of the bag. Adopt sealing rubber gasket and steel wire to realize the fixed connection of bag and bag reducing stake main part to prevent the shotcrete seepage, thereby guarantee that the bag can form the reducing stake with bag reducing stake main part after pouring into shotcrete, the cable tie at bag middle part is then in order to guarantee that bag reducing stake implantation in-process bag keeps the position unchangeable.
Preferably, the bag is annularly arranged outside the bag reducing pile body after being filled with the sprayed concrete and is integrated with the bag reducing pile body, and the radial thickness and the axial height of the bag filled with the sprayed concrete are 0.3-0.5 times of the diameter of the bag reducing pile body. The diameter-expanding type reducing pile is formed by the annular bag and the bag reducing pile main body after the bag is filled with the sprayed concrete, the shearing resistance and the bearing capacity of the pile are enhanced, the diameter of the bag reducing pile main body is 0.3-0.5 times and the axial height of the bag reducing pile main body is 0.3-0.5 times, the shearing resistance and the bearing capacity of the reducing pile are guaranteed, materials are saved, and the cost is reduced.
The utility model has the advantages that: the main body of the bag reducing pile is a prefabricated hollow pile, and the shearing resistance of the pile is effectively improved after the hollow cavity and the bag are filled with the sprayed concrete; after the injection concrete is filled in the bag, the diameter expansion is formed, and the diameter-variable pile is formed by adopting a field pouring mode, so that the vertical bearing capacity is effectively improved compared with other types of piles with the same specification; the bag reducing pile does not need to be punched and then grouted in advance, and has the advantage of no hole collapse risk compared with the traditional reducing pile which is punched and then grouted.
Drawings
Fig. 1 is a schematic structural view of the bag reducing pile of the present invention;
fig. 2 is a schematic view of an exploded structure of the reducing pile of the bag of the present invention;
fig. 3 is a schematic view of the structure of the bladder of the present invention;
fig. 4 is a cross-sectional view of the bag-type reducing pile after pile sinking;
fig. 5 is another schematic structural diagram of the bag reducing pile of the present invention;
in the figure: 1. the pile comprises a bag reducing pile body, 2 hole sections, 3 bags, 4 filling holes, 5 steel wires, 6 sealing rubber gaskets, 7 binding tapes, 8 sealing plates, 9 spraying concrete, 10 opposite supporting layers.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the present invention easy to understand, the technical solution of the present invention will be further described in detail through the specific embodiments with reference to the attached drawings.
As shown in fig. 1, 2 and 3, the bag reducing pile is used for reinforcing soft soil foundations. Including being bag reducing stake main part 1 of hollow cavity structures setting, be provided with a plurality of hole sections 2 along axial interval on bag reducing stake main part 1, the external fixation of hole section 2 has bag 3, is provided with a plurality of filling holes 4 that are used for pouring into the shotcrete to bag 3 on the hole section 2, filling hole 4 respectively with bag 3 and the inside intercommunication of bag reducing stake main part 1. The lower end of the bag reducing pile body 1 is provided with a sealing plate 8. The sealing plate is made of sealing steel plate, and can also be made of sealing prefabricated plate.
The bag reducing pile body 1 is a prefabricated hollow pile. The diameter of the hole section 2 is slightly smaller than or equal to that of the bag reducing pile body 1. The height of the hole section in the axial direction of the reducing main body of the bag is 2-3 m; the spacing distance between two adjacent hole sections 2 is 3-5 m. The diameter of the injection hole 4 is 5-8 cm. The injection hole 4 is a through hole with equal diameter or an inner flaring type horn hole; when the injection hole is an inner flaring type horn hole, the opening diameter of the injection hole 4 facing to one side of the inner part of the bag reducing pile main body 1 is larger than the opening diameter facing to the outer part of the bag reducing pile main body 1. The bag 3 is made of an impermeable material, which can be impermeable geotextile, impermeable geomembrane, bentonite waterproof blanket and the like. The bag 3 is fixedly connected with the bag reducing pile body 1 through a group of fasteners. The fastener includes steel wire 5 and sealing rubber gasket 6 that set up both ends about sack 3 to and set up at the cable tie 7 in sack 3 middle part. The bag 3 is annularly arranged outside the bag reducing pile body 1 after being filled with the sprayed concrete and is integrated with the bag reducing pile body 1, and the radial thickness and the axial height of the bag 3 after being filled with the sprayed concrete are 0.3-0.5 times of the diameter of the bag reducing pile body 1.
The construction method of the bag reducing pile comprises the following steps:
step 1), manufacturing a bag reducing pile: firstly, manufacturing a bag diameter-variable pile main body with set length, diameter and wall thickness according to the requirement of bearing capacity, arranging hole sections on the bag diameter-variable pile main body at intervals of 3-5 meters in the axial direction, and arranging a plurality of injection holes with diameters of 5-8 centimeters on the hole sections; then fixing an upper bag outside the hole section; finally, sealing the bottom of the main body of the reducing pile of the bag by using a sealing plate at the bottom of the main body of the reducing pile of the bag;
step 2), construction of the bag reducing pile: implanting the bag reducing pile into a soil body of a soft soil foundation to be reinforced, so that the pile bottom of the bag reducing pile enters a relative bearing layer;
and 3) injecting sprayed concrete into the bag reducing pile main body through a high-power pump, injecting the sprayed concrete into the bag through an injection hole in a hole section on the bag reducing pile main body, enabling the bag to bulge outwards, breaking a binding tape on the bag, continuously injecting the sprayed concrete until the bag is filled with the sprayed concrete, and finally enabling the bag to be annular and the bag reducing pile main body to form an integral bag reducing pile.
The radial thickness and the axial height of the bag filled with the sprayed concrete are 0.3-0.5 times of the diameter of the bag reducing pile main body.
Example 1:
the method comprises the following specific implementation steps: this bag reducing pile, bag reducing pile main part 1 adopts diameter 600mm, prefabricated hollow pile of wall thickness 100mm, the bottom of bag reducing pile main part 1 is sealed with thickness 3.0mm closing plate 8, beat out a plurality of filling holes of diameter 5 centimetres on bag reducing pile main part 1 every 3 meters again, form the hole section, the diameter of hole section equals the diameter of bag reducing pile main part 1, hole section 2 sets up to 2 meters at the axial height of bag reducing pile main part 1, choose prevention of seepage geotechnological cloth to make into and design specification matched with bag 3, cover bag 3 in hole section 2, bag 3 and bag reducing main part 1 matched with upper and lower both ends have filled up sealing rubber gasket 6, it is fixed with bag reducing pile main part 1 with steel wire 5 simultaneously to fix bag 3 with bag reducing pile main part 1, 3 middle parts of bag are fixed with ligature area 7. The bag 3 is annular after being filled with the sprayed concrete 9 and forms an expanding diameter with the bag diameter-variable pile body 1, and the thickness and the axial height of the bag 3 protruding to the outside of the bag diameter-variable pile body 1 are both 0.3 times of the diameter of the bag diameter-variable pile body 1.
As shown in figure 4, a bag reducing pile with the diameter of 600mm is constructed in a soft soil foundation treatment project.
The diameter 600mm is processed well before the construction, and the bag reducing pile main part 1 of wall thickness 100mm, the bottom is sealed with the circular closing plate 8 of thickness 3.0mm, every 3m is even on the circumference of bag reducing pile main part 1 sets up one section hole section, and the diameter of hole section equals the diameter of bag reducing pile main part 1, evenly is provided with a plurality of filling hole 4 on the hole section, and the filling hole is 5cm for the diameter. The bag reducing pile comprises bag reducing pile bodies 1 and bag reducing pile bodies 1, wherein the bag reducing pile bodies 1 are provided with a plurality of sections of hole sections, the bag reducing pile bodies 1 are respectively fixed with a bag 3 made of impermeable geotextile, the thickness and the height of the bag reducing pile bodies 1 which are annularly and outwards protruded after the bag 3 is filled with sprayed concrete 9 are 0.5 times of the diameter of the bag reducing pile bodies 1, the upper end and the lower end of the bag 3 are fixed with the bag reducing pile bodies 1 through tightly fixing pieces of steel wires 5 which are padded with sealing rubber gaskets 6, and the middle of the bag 2 is fixed through a binding tape 7.
During the specific construction, the following construction steps are adopted:
1) manufacturing a bag reducing pile: according to the bearing capacity requirement, a bag reducing pile main body 1 with corresponding length, diameter of 600mm and wall thickness of 100mm is manufactured, and hole sections with a plurality of injection holes are arranged at intervals of 3 meters on the bag reducing pile main body 1. Fixing a bag 3 on the hole section, fixing the upper end and the lower end of the bag 3 with a steel wire 5 padded with a rubber gasket 6 and a bag reducing pile main body 1, fixing the middle of the bag 3 with a binding tape 7, and sealing the bottom end of the bag reducing pile main body 1 with a circular sealing plate 8 with the thickness of 3 mm;
2) preparation before construction: cleaning a field, arranging a temporary walking road of a pile machine, and entering the pile machine and the bag variable-diameter pile;
3) construction of the bag reducing pile: the method comprises the steps of implanting the bag reducing pile into a soil body, enabling the bottom of the bag reducing pile to enter a relative bearing layer 10, injecting sprayed concrete 9 into a bag reducing pile main body 1 by using a high-power pump, enabling a binding tape 7 in the middle of a bag to be broken, filling the bag with the sprayed concrete 9, finally filling the bag 3 with the sprayed concrete 9 to form a ring shape, enabling the thickness and the height of the ring shape to be 0.3 times of the diameter of the bag reducing pile main body 1, namely 180 mm, stopping injecting the sprayed concrete 9, finishing construction of the bag reducing pile, and carrying out subsequent engineering construction.
Example 2:
in the embodiment shown in fig. 5, the bag diameter-variable pile body 1 is a prefabricated hollow pile with the diameter of 800mm and the wall thickness of 150mm, the bottom end of the bag diameter-variable pile body 1 is sealed by a sealing plate 8 with the thickness of 5.0mm, a plurality of injection holes with the diameter of 8 cm are punched on the bag diameter-variable pile body 1 every 5 m, and the injection holes 4 are inner flaring type horn holes; when the filling hole is interior flaring type horn hole, the filling hole 4 is greater than the opening diameter towards 1 outside of bag reducing stake main part towards the opening diameter of 1 inside one side of bag reducing stake main part, the diameter of hole section slightly is less than the diameter of bag reducing stake main part 1, for 780mm, hole section 2 highly sets up to 3 meters at 1 axial of bag reducing main part, choose for use impervious geomembrane to make and design specification matched with bag 3, overlap bag 3 at hole section 2, bag 3 has sealed rubber gasket 6 with bag reducing main part 1 matched with upper and lower both ends pad, it is fixed with bag 3 and bag reducing stake main part 1 with steel wire 5 simultaneously, 3 middle parts of bag are fixed with ligature 7. The bag 3 is annular after being filled with the sprayed concrete 9 and forms an expanding diameter with the bag diameter-variable pile body 1, and the thickness and the axial height of the bag 3 protruding to the outside of the bag diameter-variable pile body 1 are both 0.5 times of the diameter of the bag diameter-variable pile body 1.
During the specific construction, the following construction steps are adopted:
1) manufacturing a bag reducing pile: according to the bearing capacity requirement, a bag reducing pile main body 1 with corresponding length, diameter of 800mm and wall thickness of 150mm is manufactured, and hole sections with a plurality of inner flaring horn-shaped injection holes are arranged every 5 meters on the bag reducing pile main body 1. Fixing a bag 3 on the hole section, fixing the upper end and the lower end of the bag 3 with a steel wire 5 padded with a rubber gasket 6 and a bag reducing pile main body 1, fixing the middle of the bag 3 with a binding tape 7, and sealing the bottom end of the bag reducing pile main body 1 with a circular sealing plate 8 with the thickness of 5 mm;
2) preparation before construction: cleaning a field, arranging a temporary walking road of a pile machine, and entering the pile machine and the bag variable-diameter pile;
3) construction of the bag reducing pile: the method comprises the steps of implanting the bag reducing pile into a soil body, enabling the bottom of the bag reducing pile to enter a relative bearing layer 10, injecting sprayed concrete 9 into a bag reducing pile main body 1 by using a high-power pump, enabling a binding belt 7 in the middle of a bag to be broken, filling the sprayed concrete 9 into the bag, enabling the bag 3 to be annular after being filled with the sprayed concrete 9, enabling the thickness and the height of the bag to be 0.5 times of the diameter of the bag reducing pile main body 1, namely 400mm, stopping injecting the sprayed concrete 9, finishing construction of the bag reducing pile, and carrying out subsequent engineering construction.
The main body of the bag reducing pile is a prefabricated hollow pile, and the shearing resistance of the pile is effectively improved after the hollow cavity and the bag are filled with the sprayed concrete; after the injection concrete is filled in the bag, the diameter expansion is formed, and the diameter-variable pile is formed by adopting a field pouring mode, so that the vertical bearing capacity is effectively improved compared with other types of piles with the same specification; the bag reducing pile does not need to be punched and then grouted in advance, and has the advantage of no hole collapse risk compared with the traditional reducing pile which is punched and then grouted.

Claims (7)

1. The bag reducing pile is characterized in that: the bag-type variable diameter pile comprises a bag-type variable diameter pile main body (1) which is arranged in a hollow cavity structure, wherein a plurality of hole sections (2) are axially arranged on the bag-type variable diameter pile main body (1) at intervals, bags (3) are fixed outside the hole sections (2), a plurality of injection holes (4) used for injecting sprayed concrete (9) into the bags (3) are formed in the hole sections (2), and the injection holes (4) are respectively communicated with the bags (3) and the interiors of the bag-type variable diameter pile main bodies (1); the lower end of the bag reducing pile main body (1) is provided with a sealing plate (8).
2. The bag reducing pile as claimed in claim 1, wherein: the bag reducing pile main body (1) is a prefabricated hollow pile.
3. The bag reducing pile as claimed in claim 1, wherein: the spacing distance between two adjacent hole sections (2) is 3-5 m.
4. The bag reducing pile as claimed in claim 1, wherein: the diameter of the injection hole (4) is 5-8 cm.
5. The bag reducing pile as claimed in claim 1, wherein: the bag (3) is fixedly connected with the bag reducing pile main body (1) through a group of fasteners.
6. The bag reducing pile as claimed in claim 5, wherein: the fastener include set up steel wire (5) and sealing rubber gasket (6) at bag upper and lower both ends to and set up at cable tie (7) in bag (3) middle part.
7. The pouch reducing pile according to any one of claims 1 to 6, wherein: the bag (3) is annularly arranged outside the bag reducing pile main body (1) after being filled with the sprayed concrete and is integrated with the bag reducing pile main body (1), and the radial thickness and the axial height of the bag filled with the sprayed concrete (9) are 0.3-0.5 times of the diameter of the bag reducing pile main body (1).
CN201920340212.2U 2019-03-18 2019-03-18 Bag reducing pile Active CN210031788U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109868812A (en) * 2019-03-18 2019-06-11 绿城乐居建设管理集团有限公司 A kind of pouch diameter-variable pile and its construction method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109868812A (en) * 2019-03-18 2019-06-11 绿城乐居建设管理集团有限公司 A kind of pouch diameter-variable pile and its construction method

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