CN110700239B - Method for reinforcing foundation by adopting tree root piles - Google Patents
Method for reinforcing foundation by adopting tree root piles Download PDFInfo
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- CN110700239B CN110700239B CN201910823522.4A CN201910823522A CN110700239B CN 110700239 B CN110700239 B CN 110700239B CN 201910823522 A CN201910823522 A CN 201910823522A CN 110700239 B CN110700239 B CN 110700239B
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- hole
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- root pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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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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- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a method for reinforcing a foundation by adopting a tree root pile, which comprises the following steps: (A) Drilling a tree root pile hole on the main foundation, and putting a casing pipe to protect the wall while drilling to prevent the hole from collapsing; (B) Putting hole cleaning equipment into the drilled root pile hole for carrying out multiple hole cleaning operations, and taking out the hole cleaning equipment after clean water overflows from the hole opening; (C) Placing aggregate into the cleaned tree root pile hole, placing the aggregate into a grouting pipe, and simultaneously injecting water to ensure that the hole is clean; (D) The invention aims to provide a method for reinforcing a foundation by using a tree root pile, which can conveniently reinforce the foundation without being limited by a site.
Description
Technical Field
The invention belongs to the field of pile foundation construction, and particularly relates to a method for reinforcing a foundation by using a tree root pile.
Background
As a small-sized cast-in-situ bored pile, the diameter of the root pile is 150-300 mm. The stumps originated in Italy since the beginning of the thirties of the twentieth century, and have been developed in recent years. It is suitable for reinforcing the foundation of small and medium-sized industrial and civil buildings with small and dispersed load. The method can be used for foundation treatment of a newly built project and foundation underpinning of the existing project, and has particularly outstanding advantages particularly for project sites with narrow sites and low clearances.
The root pile is used for research and application in China, the underpinning and reinforcement of the Suzhou Huqiu tower are started in 1981, and the root pile is popularized and applied in Shanghai land engineering after a large number of researches and experiments. However, the domestic application of the tree root pile is mainly used for underpinning the foundation and has less application in the foundation treatment; when the site is leveled after the construction of the main structure engineering is completed, the bearing capacity of the ground of the reservoir is not strong, other foundation reinforcing methods are not suitable for the problems of the fact, the construction period, the budget and the like of the main structure engineering, and the hole cleaning is very inconvenient because the aperture is too small and the sludge content in soil is too much when the tree root pile method is adopted.
Disclosure of Invention
The invention aims to solve the problems, and provides a method for reinforcing a foundation by using tree root piles, which can conveniently reinforce the foundation without the limitation of a field.
In order to realize the purpose, the invention adopts the technical scheme that: a method for reinforcing a foundation by adopting a tree root pile comprises the following steps:
(A) Drilling tree root pile holes at intervals of 1-1.5m on a main foundation, wherein the plane layout of the tree root pile holes is a triangular layout, the length of the tree root pile holes is greater than 7m, the diameter of the tree root pile holes is 180-220mm, and the distance between the tree root pile holes and a building structure foundation is less than 1m during drilling; a casing pipe is put into the hole to protect the wall and prevent the hole from collapsing;
(B) Placing hole cleaning equipment in the drilled tree root pile hole, injecting water through a water injection pipe to perform hole cleaning operation when the hole cleaning equipment reaches the bottom of the hole, performing hole cleaning operation for 2-4 times, and taking out the hole cleaning equipment after clean water overflows from the hole opening;
(C) Placing aggregate into the cleaned tree root pile hole, and injecting clear water from the water injection pipe while placing the aggregate to ensure that the whole hole is clean;
(D) Cement grouting or concrete pouring is carried out on the tree root pile hole, the water cement ratio of the pure cement slurry is controlled to be 0.4-0.5 during grouting, and cement mortar generally adopts cement: sand: the weight ratio of water is 1.0: 0.3: 0.4, in the grouting process, the pipe needs to be pulled out immediately after grouting is finished, grout needs to be supplemented once every 1m until the pipe is pulled out, and finally the whole tree root pile construction is completed.
Further, in the step (A), a vertical drilling mode is adopted when the tree root pile hole is drilled.
And (C) placing the aggregate and a grouting pipe at the same time, and injecting water to clean the hole.
The hole cleaning equipment used by the method for reinforcing the foundation by adopting the tree root pile comprises a movable machine body and a water injection pipe arranged in a hole; the water injection pipe is provided with a partition device capable of moving along the water injection pipe, and the partition device is connected with the mobile machine body through a winch; an opening is formed in the partition equipment, a switch plate is hinged to the inner wall of one side of the opening, and a boss is arranged on the inner wall of the other side of the opening; the partition device is characterized in that a cavity is formed above the boss, a baffle is arranged in the cavity, the middle of the baffle is connected to the inner wall of the cavity in a connecting mode, a pull rod capable of vertically moving along the partition device is arranged in the cavity, a clamping tooth is arranged at the tail end of the pull rod, and one side of the clamping tooth is in contact with one end of the baffle.
Furthermore, the winch is connected with a pull ring, and the pull ring is connected with the head end of the pull rod through a pull rope.
Furthermore, the two sides of the partition equipment are provided with bristles, and the bristles are arranged along the side edges of the partition equipment.
Furthermore, the switch board is provided with a heavy object block.
Furthermore, both sides of the baffle are connected with the inner wall of the cavity through elastic rubber.
The invention has the beneficial effects that: the method for reinforcing the foundation by the tree root piles is provided, the foundation can be conveniently reinforced, and the limitation of a field is avoided.
1. The method has wide applicable conditions, is not limited by the conditions of construction sites, can effectively reinforce the existing foundation, and finds out the construction arrangement which does not influence other procedures in the actual operation;
2. by adopting the partition equipment and utilizing the piston principle, the backflow of water during hole cleaning can be prevented, so that the hole cleaning efficiency is reduced; the descending speed of the whole partition equipment can be improved by using the limit switch plate, and meanwhile, the backflow of water is prevented when the partition equipment is pulled upwards;
3. the bristles arranged at the edge of the partition equipment can effectively prevent muddy water from flowing back from a gap between the partition equipment and the sleeve;
4. the pull rope is used for controlling the baffle to be opened and closed, so that the operation is convenient and quick, and no additional starting equipment is needed;
drawings
FIG. 1 is a schematic view of the main structure of the present invention.
Fig. 2 is a schematic perspective view of the partition apparatus of the present invention.
FIG. 3 is a schematic top view of the partition apparatus of the present invention.
Fig. 4 isbase:Sub>A schematic cross-sectional view taken along linebase:Sub>A-base:Sub>A in fig. 3.
FIG. 5 is a schematic side view of a partition apparatus according to the present invention.
Fig. 6 is a schematic cross-sectional view taken along line B-B in fig. 5.
The text labels in the figures are represented as: 1. moving the machine body; 2. a water injection pipe; 3. a partition device; 31. an opening; 32. a switch plate; 33. a boss; 34. a cavity; 35. a baffle plate; 36. a pull rod; 361. clamping teeth; 37. brushing; 4. and (4) a pull ring.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
Example 1:
the invention specifically comprises the following steps: a method for reinforcing a foundation by adopting a tree root pile comprises the following steps:
(A) Drilling tree root pile holes at intervals of 1m on a main foundation, wherein the plane layout of the tree root pile holes is a triangular layout, the length of the tree root pile holes is 7m, the diameter of the tree root pile holes is 180mm, and the distance between the tree root pile holes and a building structure foundation is 1m during drilling; a casing pipe is put into the hole to protect the wall and prevent the hole from collapsing;
(B) Putting hole cleaning equipment in the drilled root pile hole, injecting water through a water injection pipe to perform hole cleaning operation when the hole cleaning equipment reaches the bottom of the hole, performing hole cleaning operation for 2 times, and taking out the hole cleaning equipment after ensuring that clear water overflows from a hole opening;
(C) Placing aggregate into the cleaned tree root pile hole, and injecting clear water from the water injection pipe while placing the aggregate to ensure that the whole hole is clean;
(D) Cement grouting or concrete pouring are carried out on the tree root pile hole, the water cement ratio of pure cement mortar is controlled to be 0.4 when grouting is carried out, and cement mortar generally adopts cement: sand: the weight ratio of water is 1.0: 0.3: 0.4, in the grouting process, the pipe needs to be pulled out immediately after grouting is finished, grout must be supplemented once every 1m until the pipe is pulled out, and finally the whole tree root pile construction is finished.
Preferably, in the step (a), a vertical drilling mode is adopted when the tree root pile hole is drilled.
Preferably, in the step (C), the grouting pipe is put in and the hole is filled with water while the aggregate is put in.
Example 2:
the invention specifically comprises the following steps: a method for reinforcing a foundation by adopting tree root piles comprises the following steps:
(A) Drilling tree root pile holes at intervals of 1.2m on a main foundation, wherein the plane layout of the tree root pile holes is a triangular layout, the length of the tree root pile holes is 8m, the diameter of the tree root pile holes is 200mm, and the distance between the tree root pile holes and a building structure foundation is 0.8m during drilling; a casing pipe is put into the hole to protect the wall and prevent the hole from collapsing;
(B) Placing hole cleaning equipment in the drilled tree root pile hole, injecting water through a water injection pipe to perform hole cleaning operation when the hole cleaning equipment reaches the bottom of the hole, performing hole cleaning operation for 3 times, and taking out the hole cleaning equipment after clean water overflows from an orifice;
(C) Placing aggregate into the cleaned tree root pile hole, and injecting clear water from the water injection pipe while placing the aggregate to ensure that the whole hole is clean;
(D) Cement grouting or concrete pouring is carried out on the tree root pile hole, the water cement ratio of pure cement mortar is controlled to be 0.45 when grouting is carried out, and cement mortar generally adopts cement: sand: the weight ratio of water is 1.0: 0.3: 0.4, in the grouting process, the pipe needs to be pulled out immediately after grouting is finished, grout needs to be supplemented once every 1m until the pipe is pulled out, and finally the whole tree root pile construction is completed.
Preferably, in the step (a), a vertical drilling mode is adopted when the tree root pile hole is drilled.
Preferably, in the step (C), the grouting pipe is put in and the hole is filled with water while the aggregate is put in.
Example 3
The invention specifically comprises the following steps: a method for reinforcing a foundation by adopting a tree root pile comprises the following steps:
(A) Drilling tree root pile holes at intervals of 1.5m on a main foundation, wherein the plane layout of the tree root pile holes is a triangular layout, the length of the tree root pile holes is 9m, the diameter of the tree root pile holes is 220mm, and the distance between the tree root pile holes and a building structure foundation is 0.7m during drilling; a casing pipe is put into the hole to protect the wall and prevent the hole from collapsing;
(B) Placing hole cleaning equipment in the drilled tree root pile hole, injecting water through a water injection pipe to perform hole cleaning operation when the hole cleaning equipment reaches the bottom of the hole, performing hole cleaning operation for 4 times, and taking out the hole cleaning equipment after clean water overflows from an orifice;
(C) Placing aggregate into the cleaned tree root pile hole, and injecting clear water from the water injection pipe while placing the aggregate to ensure that the whole hole is clean;
(D) Cement grout or concrete placement are carried out to root stake hole, and the water cement ratio of pure cement thick liquid should be controlled at 0.5 when the grout, and cement mortar generally adopts cement: sand: the weight ratio of water is 1.0: 0.3: 0.4, in the grouting process, the pipe needs to be pulled out immediately after grouting is finished, grout must be supplemented once every 1m until the pipe is pulled out, and finally the whole tree root pile construction is finished.
Preferably, in the step (a), a vertical drilling mode is adopted when the tree root pile hole is drilled.
Preferably, in the step (C), the grouting pipe is put in and the hole is filled with water while the aggregate is put in.
As shown in fig. 1-6, the hole cleaning device used in the above embodiment comprises a movable body 1 and a water injection pipe 2 arranged in the hole; the water injection pipe 2 is provided with a partition device 3 capable of moving along the water injection pipe 2, and the partition device 3 is connected with the movable machine body 1 through a winch; an opening 31 is formed in the partition equipment 3, a switch plate 32 is hinged to the inner wall of one side of the opening 31, and a boss 33 is formed in the inner wall of the other side of the opening 31; a cavity 34 is formed above the boss 33, the cavity 34 is a T-shaped cavity, a baffle 35 is arranged at the lower part of the cavity 34, the middle part of the baffle 35 is connected to the inner wall of the cavity 34, a pull rod 36 capable of moving vertically along the partition equipment 3 is arranged in the cavity 34, the head end of the pull rod 35 penetrates through the partition equipment 3, abrasive particles are arranged between the pull rod 36 and the inner wall of the cavity 34 for increasing friction, a latch 361 is arranged at the tail end of the pull rod 36, and one side of the latch 361 is contacted with one end of the baffle 35; by adopting the partition equipment, the backflow of water during hole cleaning can be prevented by utilizing the piston principle, so that the hole cleaning efficiency is reduced; and the use of the limit switch board can improve the descending speed of the whole partition equipment and prevent the backflow of water during pulling up.
Preferably, the winch is connected with a pull ring 4, and the pull ring 4 is connected with the head end of a pull rod 36 through a pull rope; the pull rope controls the baffle to be opened and closed, so that the device is convenient and quick, and does not need extra starting equipment.
Preferably, bristles 37 are arranged on both sides of the partition device 3, and the bristles 37 are arranged along the side edges of the partition device 3; the bristles arranged at the edge of the partition equipment can effectively prevent muddy water from flowing back from a gap between the partition equipment and the sleeve.
Preferably, the switch plate 32 is provided with a heavy object block; the closing of the switch plate can be accelerated by adopting the weight block.
Preferably, both sides of the baffle 35 are connected with the inner wall of the cavity 34 through elastic rubber; the elastic rubber can prevent muddy water from entering the cavity, and the whole mechanism is prevented from being blocked.
When the water injection pipe 2 is fixed at the center of a sleeve when holes need to be cleaned, then the winch rope is loosened, the partition device 3 is enabled to slowly slide down along the water injection pipe 2, the switch plate 32 is opened under the action of water in the downward sliding process, the downward sliding speed of the partition device 3 is accelerated, after the partition device 3 reaches the bottom and waits for 3 minutes, the switch plate 32 returns to the original position under the action of a heavy object block, then the pull rod 36 is pulled up by the pull rope through the winch pulling rope, the latch 361 moves upwards at the moment, the baffle 35 is forced to rotate, when the latch 361 moves to the upper limit, the baffle 35 clamps the switch plate 32, the switch plate cannot move, the water injection pipe 2 is connected with a water pump, then the hole cleaning water is injected, meanwhile, the winch pulls the pull rope, the water level rising rate of the lower end of the partition device 3 is higher than the pull rope pulling rate of the winch, until the partition device 3 comes out of the hole from the drilling, and the whole hole cleaning operation is finished.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (7)
1. A method for reinforcing a foundation by adopting a tree root pile is characterized by comprising the following steps:
(A) Drilling tree root pile holes at intervals of 1-1.5m on a main foundation, wherein the plane layout of the tree root pile holes is a triangular layout, the length of the tree root pile holes is greater than 7m, the diameter of the tree root pile holes is 180-220mm, and the distance between the tree root pile holes and a building structure foundation is less than 1m during drilling; a casing pipe is put into the hole to protect the wall and prevent the hole from collapsing;
(B) Putting hole cleaning equipment into the drilled root pile hole, injecting water through a water injection pipe when the hole cleaning equipment reaches the bottom of the hole to perform hole cleaning operation for 2-4 times, and taking out the hole cleaning equipment after clean water overflows from the hole opening;
(C) Placing aggregate into the cleaned tree root pile hole, and injecting clean water from the water injection pipe while placing the aggregate to ensure that the whole hole is clean;
(D) Cement grouting or concrete pouring is carried out on the tree root pile hole, the water cement ratio of the pure cement slurry is controlled to be 0.4-0.5 during grouting, and the cement slurry adopts cement: sand: the weight ratio of water is 1.0: 0.3: 0.4, in the grouting process, the pipe needs to be pulled out immediately after the grouting is finished, the grout needs to be supplemented once every 1m until the pipe is pulled out, and finally the whole tree root pile construction is finished;
wherein the hole cleaning equipment comprises a movable machine body (1) and a water injection pipe (2) arranged in a hole; the water injection pipe (2) is provided with a partition device (3) capable of moving along the water injection pipe (2), and the partition device (3) is connected with the movable machine body (1) through a winch; an opening (31) is formed in the partition equipment (3), a switch plate (32) is hinged to the inner wall of one side of the opening (31), and a boss (33) is arranged on the inner wall of the other side of the opening (31); a cavity (34) is arranged above the boss (33), a baffle (35) is arranged in the cavity (34), the middle of the baffle (35) is hinged to the inner wall of the cavity (34), a pull rod (36) capable of moving vertically along the partition equipment (3) is arranged in the cavity (34), clamping teeth (361) are arranged at the tail end of the pull rod (36), and one side of each clamping tooth (361) is in contact with one end of the baffle (35).
2. The method of claim 1, wherein the step (A) of drilling the hole is performed by drilling a hole vertically.
3. The method for reinforcing a foundation with a root pile as claimed in claim 1, wherein the grouting pipe is put and the hole is filled with water while the aggregate is put in step (C).
4. A method for consolidating foundation by means of stumps according to claim 1, characterized in that the hoist is connected to a pull ring (4), the pull ring (4) being connected to the head end of the pull rod (36) by means of a pull rope.
5. A method for consolidating a foundation with root piles according to claim 1, characterised in that the partition device (3) is provided with bristles (37) on both sides, the bristles (37) being provided along the sides of the partition device (3).
6. A method of consolidating foundation with stumps according to claim 1, wherein said switch plate (32) is provided with heavy pieces.
7. A method of consolidating a foundation with root stakes as claimed in claim 1, wherein said dam (35) is attached to the inner wall of the cavity (34) by elastic rubber on both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910823522.4A CN110700239B (en) | 2019-09-02 | 2019-09-02 | Method for reinforcing foundation by adopting tree root piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910823522.4A CN110700239B (en) | 2019-09-02 | 2019-09-02 | Method for reinforcing foundation by adopting tree root piles |
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| Publication Number | Publication Date |
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| CN110700239A CN110700239A (en) | 2020-01-17 |
| CN110700239B true CN110700239B (en) | 2022-11-25 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202645442U (en) * | 2012-05-21 | 2013-01-02 | 北京市三一重机有限公司 | Foundation and hole bottom residue removing drilling rig |
| CN103696417B (en) * | 2013-12-20 | 2016-01-06 | 中国一冶集团有限公司 | Secondary pile hole cleaning device and method bottom a kind of bored pile |
| CN109183797B (en) * | 2018-10-20 | 2020-08-21 | 四川志德公路工程有限责任公司 | Pile foundation hole cleaning device and process |
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Effective date of registration: 20210113 Address after: 414000 room 602, xinluncheng, Qingnian Middle Road, Yueyanglou District, Yueyang City, Hunan Province Applicant after: Hunan Murong Engineering Management Co.,Ltd. Address before: Floor 15, jinyingge, pedestrian street, dongmaoling Road, Yueyanglou District, Yueyang City, Hunan Province 414000 Applicant before: Yueyang Pengcheng Construction Engineering Co.,Ltd. |
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