CN116240883A - Stirring pile construction method for penetrating existing underground reinforced concrete structure - Google Patents
Stirring pile construction method for penetrating existing underground reinforced concrete structure Download PDFInfo
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- CN116240883A CN116240883A CN202310144393.2A CN202310144393A CN116240883A CN 116240883 A CN116240883 A CN 116240883A CN 202310144393 A CN202310144393 A CN 202310144393A CN 116240883 A CN116240883 A CN 116240883A
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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
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/08—Removing obstacles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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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
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Abstract
The invention discloses a construction method of a stirring pile penetrating through the existing underground reinforced concrete structure, which comprises the following steps: s1, excavating a filling area, wherein the filling area comprises a first filling area and a second filling area, and the filling area is provided with a filling device; s2, backfilling the backfilled area to the ground by adopting first cement soil in a layered manner and compacting; s3, designing a second obstacle clearance area according to the stirring pile construction area, wherein the stirring pile construction area is positioned in the second obstacle clearance area, then drilling holes in the second obstacle clearance area by adopting a full-circle casing pipe drilling machine, and the bottom end of each obstacle clearance hole is lower than the bottom surface of the bottom plate of the underground structure; backfilling the obstacle clearance holes by adopting second cement soil in a layering way; s4, performing construction of the stirring pile in the second obstacle clearance area. The construction method of the invention utilizes the existing underground reinforced concrete structure to retain soil and water, has little influence on surrounding environment, has no risk of foundation pit construction, is safe and quick in construction process, and shortens construction period.
Description
Technical Field
The invention relates to a tunnel and underground engineering, in particular to a construction method of a stirring pile penetrating through the existing underground reinforced concrete structure.
Background
The triaxial mixing pile is an effective form of soft foundation treatment, and the mixing pile machine is used for spraying cement into soil body and fully mixing the cement and the soil body so as to make the cement and the soil produce a series of physical and chemical reactions and harden soft soil to raise foundation strength.
When the construction process of the triaxial mixing pile meets the existing underground reinforced concrete structural barriers, the existing construction method comprises the steps of firstly excavating and then removing the barriers, then backfilling and then constructing the mixing pile, wherein the concrete construction method comprises the following steps: firstly, constructing foundation pit supports and supports on the outer sides of barriers, and implementing foundation pit dewatering; then excavating a foundation pit and removing the underground reinforced concrete structure barriers; backfilling and compacting the soil after the underground obstacle is cleaned; and finally, removing the foundation pit support and the support, and constructing the triaxial stirring pile. However, the construction method has the following disadvantages:
(1) If the underground reinforced concrete structure barrier to be treated is only a part of the whole underground structure, the construction difficulty of the foundation pit enclosure for removing the barrier is high, and the foundation pit cannot be closed.
(2) When the surrounding buildings or structures are close to each other, the foundation pit is used for excavating and removing the underground barriers, the stability of the buildings or structures is greatly influenced, adjacent projects can be mutually influenced, when the surrounding buildings are too close to the foundation pit, the deformation of the foundation pit can be greatly influenced, and when other construction projects exist around, the deformation of the foundation pit can be aggravated.
(3) The existing construction method has the defects of multiple and complex procedures, long construction period and high construction cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art that the stirring pile encounters the existing underground reinforced concrete barrier construction, and provides a stirring pile construction method for penetrating through the existing underground reinforced concrete structure.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a pass through stirring stake construction method of existing underground reinforced concrete structure, underground reinforced concrete structure includes underground structure bottom plate, underground structure roof and underground structure wall body, underground structure wall body includes the lateral wall, the lateral wall is vertical to be set up underground structure bottom plate with between the underground structure roof, the construction method includes following steps:
step S1, excavating a filling area, wherein the filling area comprises a first filling area and a second filling area, and the concrete steps are as follows:
s11, excavating a ground slope to the depth of a top plate of the underground structure to form a first filling-changing area, wherein an area surrounded by the outer side walls is the second filling-changing area, and the bottom of the first filling-changing area is positioned right above the second filling-changing area;
s12, breaking the top plate of the underground structure; removing the buildings in the area between the outer side walls to form the second filling area;
s2, backfilling the backfilled area to the ground by adopting first cement soil in a layered manner and compacting;
s3, designing a second obstacle clearance area according to the stirring pile construction area, wherein the stirring pile construction area is positioned in the second obstacle clearance area, and then drilling holes in the second obstacle clearance area by adopting a full-circle casing pipe drilling machine, wherein the bottom ends of the obstacle clearance holes are lower than the bottom surface of the underground structure bottom plate; backfilling the obstacle clearance holes by adopting second cement soil in a layering way;
and S4, performing construction of the stirring pile in the second obstacle clearance area.
According to the technical scheme, the existing underground reinforced concrete structure is utilized for retaining soil and water, a first filling area is excavated by slope placement, the bottom of the first filling area is the upper part of the outer side wall, the depth and the area of the excavation of the first filling area are small, and a temporary enclosure structure is not required to be arranged in the first filling area; the second filling area is formed by enclosing an underground structure bottom plate and an outer side wall, the existing underground structure is utilized for retaining soil, the stability of a foundation can be guaranteed after the first cement soil is adopted for backfilling in the filling area economically, a full-convolution sleeve drilling machine is used for taking holes to remove the reinforced concrete structure of the existing underground structure bottom plate, a second obstacle clearance area is formed, the influence of the method for breaking the reinforced concrete structure on peripheral buildings is small, the safety of a foundation pit and the peripheral environment is guaranteed, and the triaxial mixing pile can be conveniently and rapidly constructed in the second obstacle clearance area.
In the invention, the underground structure wall is a wall body which forms an underground structure space in a surrounding manner in the vertical direction.
As a preferred embodiment of the present invention, the detailed steps of step S2 are as follows: and backfilling the first backfill area and the second backfill area of the backfill area by adopting 8% cement soil, and then compacting the backfill area, wherein the compactness is not lower than 92%.
As a preferable scheme of the invention, the bottom end of the obstacle clearance hole is not lower than 1m than the bottom surface of the underground structure bottom plate, so that the reinforced concrete obstacle is ensured to be completely cleaned, and the construction of the stirring pile is facilitated.
As a preferable scheme of the invention, the method for drilling the obstacle clearance hole in the second obstacle clearance area by adopting the full-circle casing drilling machine and backfilling the obstacle clearance hole by adopting the first cement soil layer comprises the following specific steps:
and S31, drilling by adopting a full-circle casing drill according to the design of the second obstacle clearance area, wherein the drilling adopts a steel casing. In the construction process, attention should be paid to the fact that concrete blocks or large blocks of stones and the like cannot be backfilled to the steel sleeve of the full-circle sleeve drilling machine, and the follow-up triaxial mixing pile construction is affected.
And S32, backfilling the second cement soil of the obstacle clearance Kong Caiyong in the steel sleeve, and pulling out the steel sleeve while backfilling the second cement soil in the backfilling process, and tamping the second cement soil by using an impact hammer, wherein the steel sleeve is pulled out after the backfilling of the obstacle clearance hole is completed.
As a preferable scheme of the invention, the underground structure wall body further comprises lining walls, and the lining walls are vertically arranged between the outer side walls. In step S11, the first filling area is formed by digging from the ground slope to the depth of the top plate of the underground structure, and the bottom of the first filling area is between the outer side wall and the inner lining wall.
Compared with the prior art, the invention has the beneficial effects that:
1. the construction method of the invention firstly excavates the first filling area on a slope, the bottom of the first filling area is the upper part of the outer side wall, the depth and the area of the excavation of the first filling area are smaller, and the first filling area does not need to be provided with a temporary enclosure structure; the second filling area is formed by enclosing an underground structure bottom plate and an outer side wall, the existing underground structure is utilized for retaining soil, the stability of a foundation can be guaranteed after the first cement soil is adopted for backfilling in the filling area economically, a full-convolution sleeve drilling machine is used for taking holes to remove the reinforced concrete structure of the existing underground structure bottom plate, a second obstacle clearance area is formed, the influence of the method for breaking the reinforced concrete structure on peripheral buildings is small, the safety of a foundation pit and the peripheral environment is guaranteed, and the triaxial mixing pile can be conveniently and rapidly constructed in the second obstacle clearance area.
2. The construction method of the invention utilizes the existing underground reinforced concrete structure to retain soil and water, other structures are reserved except the existing underground structure top plate, and the problems of foundation pit leakage and peripheral water and soil loss can not occur.
3. The construction method has little influence on the surrounding environment, the construction process is safe and quick, the construction period is shortened, and the risk of foundation pit construction is avoided.
Description of the drawings:
FIG. 1 is a flow chart of a method of construction of a stirred pile of the present invention across an existing underground reinforced concrete structure;
FIG. 2 is a schematic cross-sectional view of the first reclamation area constructed in step S1 of example 2;
FIG. 3 is a schematic cross-sectional view of a second reclamation area constructed in step S1 of example 2;
FIG. 4 is a schematic cross-sectional view of the backfill area of step S2 of example 2;
FIG. 5 is a schematic plan view of a second obstacle clearing area in step S3 of embodiment 2;
FIG. 6 is a schematic cross-sectional view of the clearance hole in step S3 of example 2;
FIG. 7 is a schematic cross-sectional view of the backfill clearance hole of step S3 of example 2;
FIG. 8 is a schematic cross-sectional view of a triaxial stirring pile constructed in step S3 of example 2;
FIG. 9 is a schematic cross-sectional view of the first reclamation area constructed in step S1 of example 3;
the marks in the figure: the concrete pile comprises a top plate of an 11-underground structure, an outer side wall of the 12-underground structure, a bottom plate of the 13-underground structure, a lining wall of the 14-underground structure, a first filling area of the 2-underground structure, a second filling area of the 3-underground structure, first cement soil of the 4-underground structure, barrier removing holes of the 5-underground structure, stirring pile construction holes of the 6-underground structure and second cement soil of the 7-underground structure.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, a construction method of a stirring pile penetrating through an existing underground reinforced concrete structure, the underground reinforced concrete structure comprises an underground structure bottom plate 13, an underground structure top plate 11 and an underground structure wall body, the underground structure wall body comprises an outer side wall 12, the outer side wall 12 is vertically arranged between the underground structure bottom plate 13 and the underground structure top plate 11, the construction method comprises the following steps:
step S1, excavating a filling area, wherein the filling area comprises a first filling area 2 and a second filling area 3, and the concrete steps are as follows:
s11, excavating a slope from the ground to the depth of the top plate 11 of the underground structure to form a first reclamation area 2, wherein a region surrounded by the outer side walls is the second reclamation area 3, and the bottom of the first reclamation area 2 is positioned right above the second reclamation area 3;
s12, breaking the top plate 11 of the underground structure; removing the building in the area between the outer side walls 12 to form the second reclamation area 3;
s2, backfilling the backfilled area to the ground by adopting first cement soil 4 in a layered manner, and compacting;
s3, designing a second obstacle clearance area according to the stirring pile construction area, wherein the stirring pile construction area is positioned in the second obstacle clearance area, and then drilling holes in the second obstacle clearance area by adopting a full-circle casing pipe drilling machine to form obstacle clearance holes 5, wherein the bottom ends of the obstacle clearance holes 5 are lower than the bottom surface of the underground structure bottom plate 13; backfilling the obstacle clearance holes 5 by adopting second cement soil 7;
and S4, performing construction of the stirring pile in the second obstacle clearance area.
The underground structure wall body is a wall body which is enclosed in the vertical direction to form an underground structure space. The construction method of the invention utilizes the existing underground reinforced concrete structure to retain soil and water, other structures are reserved except the existing underground structure top plate, and the problems of foundation pit leakage and peripheral water and soil loss can not occur. The construction method of the invention not only can be used for the construction of triaxial mixing piles, but also can be used for other mixing piles when encountering the existing underground reinforced concrete structure, such as MJS construction method piles, high-pressure jet grouting piles, drilling piles and the like.
Example 2
The construction method of the embodiment 1 is adopted in the embodiment to carry out concrete construction, specifically, the stirring pile is a triaxial stirring pile, a triaxial stirring pile construction drill bit is phi 850@600mm, and a full-circle casing drilling machine is a steel casing pipe with phi 1500mm.
In step S1, from the ground, the first filling area 2 is excavated by slope, as shown in fig. 2, the first filling area 2 is in an inverted trapezoid shape, the bottom of the first filling area 2 is the upper portion of the top plate 11 of the underground structure, and the slope rate of slope is less than or equal to 1:1, in this embodiment, the construction area of the triaxial mixing pile is located between the outer side walls 12 of the underground structure, so that an area surrounded by the outer side walls is taken as the second filling area 3, the bottom boundary of the first filling area 2 is the top end of the outer side wall 12, that is, the bottom of the first filling area 2 is communicated with and equal to the second filling area 3, as shown in fig. 3, and the top plate 11 of the underground structure is broken; the building between the outer side walls 12 is removed, and the space between the outer side walls 12 forms the second reclamation area 3.
The construction is carried out by adopting a digging machine to break the top plate 11 of the underground structure, the outer side wall 12 and the bottom plate 13 of the underground structure are reserved, and earthwork and construction residues in the construction are transported out in time.
In the step S2, 8% cement soil is adopted to backfill the first backfill area 2 and the second backfill area 3 of the backfill area, and then the backfill area is compacted, wherein the compaction degree is not lower than 92%. In the backfilling construction process, water can be sprayed and maintained, so that the strength of the first cement soil 4 is ensured. After backfilling, the top of the backfill area is leveled with the ground, as shown in fig. 4.
In step S3, according to the position of the designed triaxial stirring pile, a second obstacle clearance area is designed according to the stirring pile construction area, the stirring pile construction hole 6 is completely located in the second obstacle clearance area, in this embodiment, the second obstacle clearance area is formed by combining the obstacle clearance holes 5, the obstacle clearance holes 5 are formed by the construction of a full-circle casing drilling machine, the reinforced concrete structure of the underground structure bottom plate 13 can be removed through the full-circle casing drilling machine, large-scale construction is prevented, and as shown in fig. 5 and 6, according to the plan view of the second obstacle clearance area, the lofting is measured in the replacement area, and the hole position of the obstacle clearance hole 5 is released.
The full-circle casing drilling machine is in place, the full-circle casing drilling machine is stable and smooth after being in place, verticality is observed by a plumb bob, the deviation of the pile center is not more than 50mm, and the pile body verticality error is not more than 1/200.
The triaxial stirring pile construction area adopts full-circle casing pipe drilling machine to clear up all reinforced concrete structures, the bottom of clearance hole 5 is less than the bottom surface of underground structure bottom plate 13, and further, clearance degree of depth is than underground structure bottom plate 13 is low and the low size is greater than 1m, so with guaranteeing the whole clean up of reinforced concrete barrier, more be favorable to the construction of stirring pile.
The specific steps of adopting a full-circle casing drilling machine to drill holes in the second obstacle clearance area to form obstacle clearance holes 5 and adopting cement soil to backfill the obstacle clearance holes 5 in a layering manner are as follows:
and S31, drilling by adopting a full-circle casing drill according to the design of the second obstacle clearance area, wherein the drilling adopts a steel casing. In the construction process, attention should be paid to the fact that concrete blocks or large blocks of stones and the like cannot be backfilled to the steel sleeve of the full-circle sleeve drilling machine, and the follow-up triaxial mixing pile construction is affected.
Step S32, backfilling the obstacle clearance holes 5 in the steel sleeve by adopting second cement soil 7, and pulling out the steel sleeve while backfilling the second cement soil 7 in the backfilling process, and tamping the second cement soil 7 by using an impact hammer, wherein the steel sleeve is pulled out after the backfilling of the obstacle clearance holes 5 is completed. The back filling of the obstacle clearance holes 5 is shown in fig. 7.
The second cemented soil 7 in the clearance hole 5 is 8% cemented soil, which is the same as the first cemented soil 4 in the backfill region. After the previous obstacle clearance hole 5 is completed, the full-circle casing drilling machine is moved to perform the next construction of the obstacle clearance hole 5, and the obstacle clearance hole 5 can be sequentially constructed or can be constructed at intervals, and the embodiment is not limited specifically.
In step S4, after all the obstacle clearance holes 5 are completed, the second obstacle clearance area is formed, and the triaxial mixing pile is constructed in the second obstacle clearance area, as shown in fig. 8.
Example 3
The present embodiment provides a construction method of a stirring pile penetrating through an existing underground reinforced concrete structure, which is similar to embodiment 1, except that the underground structure wall body of the present embodiment further includes a lining wall 14, and the lining wall 14 is vertically disposed between the outer side walls 12. In this embodiment, the mixing pile construction area is located between the outer side walls 12 of the underground structure, and the lining wall 14 is located in the mixing pile construction area, so that the second reclamation area 3 is an area surrounded by the outer side walls, and the outer side walls are used for retaining soil and water. In step S12, the lining wall 14 located in the region where the mixing piles are to be constructed is broken at the same time as the roof of the underground structure is broken.
Example 4
The present embodiment provides a method for constructing a mixing pile penetrating through an existing underground reinforced concrete structure, which is similar to embodiment 3, except that the lining walls 14 of the present embodiment are vertically disposed between the outer side walls 12, and the lining walls 14 are not located in a mixing pile construction area, as shown in fig. 9, between the outer side walls 12 and the lining walls 14 on the left. Thus, the second reclamation area 3 is an area enclosed between the outer side wall 12 and the inner lining wall 14, and the outer side wall 12 and the inner lining wall 14 are utilized to retain soil and water. In step S11, the first reclamation area 2 is excavated on a slope, the bottom of the first reclamation area 2 is between the outer side wall 12 and the inner lining wall 14, and the bottom boundary of the first reclamation area 2 is the top end of the outer side wall 12 or the inner lining wall 14.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The utility model provides a pass through stirring stake construction method of existing underground reinforced concrete structure, underground reinforced concrete structure includes underground structure bottom plate, underground structure roof and underground structure wall body, underground structure wall body includes the lateral wall, the lateral wall is vertical to be set up underground structure bottom plate with between the underground structure roof, its characterized in that, construction method includes following steps:
step S1, excavating a filling area, wherein the filling area comprises a first filling area and a second filling area, and the concrete steps are as follows:
s11, excavating a ground slope to the depth of a top plate of the underground structure to form a first filling-changing area, wherein an area surrounded by the outer side walls is the second filling-changing area, and the bottom of the first filling-changing area is positioned right above the second filling-changing area;
s12, breaking the top plate of the underground structure; removing the buildings in the area between the outer side walls to form the second filling area;
s2, backfilling the backfilled area to the ground by adopting first cement soil in a layered manner and compacting;
s3, designing a second obstacle clearance area according to the stirring pile construction area, wherein the stirring pile construction area is positioned in the second obstacle clearance area, and then drilling holes in the second obstacle clearance area by adopting a full-circle casing pipe drilling machine, wherein the bottom ends of the obstacle clearance holes are lower than the bottom surface of the underground structure bottom plate; backfilling the obstacle clearance holes by adopting second cement soil in a layering way;
and S4, performing construction of the stirring pile in the second obstacle clearance area.
2. The method for constructing a stirring pile penetrating through an existing underground reinforced concrete structure according to claim 1, wherein the detailed steps of the step S2 are as follows: and backfilling the first backfill area and the second backfill area of the backfill area by adopting 8% cement soil, and then compacting the backfill area, wherein the compactness is not lower than 92%.
3. The method for constructing a stirring pile penetrating through an existing underground reinforced concrete structure according to claim 1, wherein the bottom end of the obstacle clearance hole is not less than 1m lower than the bottom surface of the underground structure bottom plate.
4. The method for constructing a stirring pile penetrating through an existing underground reinforced concrete structure according to claim 1, wherein the specific steps of forming an obstacle clearance hole by drilling in the second obstacle clearance area by using a full-circle casing drill and backfilling the obstacle clearance hole by using second cement soil in a layered manner are as follows:
s31, drilling holes by using a full-circle casing drilling machine according to the design of the second obstacle clearance area, wherein the drilling holes are steel casings;
and S32, backfilling the second cement soil of the obstacle clearance Kong Caiyong in the steel sleeve, and pulling out the steel sleeve while backfilling the second cement soil in the backfilling process, and tamping the second cement soil by using an impact hammer, wherein the steel sleeve is pulled out after the backfilling of the obstacle clearance hole is completed.
5. The method of claim 1-4, wherein the underground structure wall further comprises lining walls vertically disposed between the outer side walls.
6. The method according to claim 5, wherein the second filling area is an area surrounded by the outer wall and the inner wall, and in step S11, the first filling area is formed by digging from the ground to the depth of the top plate of the underground structure, and the bottom of the first filling area is between the outer wall and the inner wall.
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| CN202310144393.2A CN116240883A (en) | 2023-02-21 | 2023-02-21 | Stirring pile construction method for penetrating existing underground reinforced concrete structure |
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| CN202310144393.2A CN116240883A (en) | 2023-02-21 | 2023-02-21 | Stirring pile construction method for penetrating existing underground reinforced concrete structure |
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