CN115030170B - Hole collapse backfill construction method and backfill auxiliary device for bored pile - Google Patents

Hole collapse backfill construction method and backfill auxiliary device for bored pile Download PDF

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Publication number
CN115030170B
CN115030170B CN202210629883.7A CN202210629883A CN115030170B CN 115030170 B CN115030170 B CN 115030170B CN 202210629883 A CN202210629883 A CN 202210629883A CN 115030170 B CN115030170 B CN 115030170B
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China
Prior art keywords
auxiliary device
hole
concrete
collapse
bored pile
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CN202210629883.7A
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CN115030170A (en
Inventor
张继珍
徐建刚
谷建伟
吴建标
胡金刚
刘杰
韩学良
李智杰
张庆华
杨晓辉
翟瑞明
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China Railway 12th Bureau Group Co Ltd
Third Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
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China Railway 12th Bureau Group Co Ltd
Third Engineering Co Ltd of China Railway 12th Bureau Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same

Abstract

The application belongs to the technical field of pile foundation drilling construction, and particularly relates to a drilling pile hole collapse backfilling construction method and a backfilling auxiliary device, which solve the problems that the traditional treatment mode is labor-consuming and labor-consuming, the treatment effect is general, and hole collapse can occur again during re-drilling. When the hole collapse occurs in the drilling process, an auxiliary device is erected in the drill hole after the hole collapse is cleaned, the bottom of the auxiliary device is embedded into soil, concrete is backfilled between the drill hole and the auxiliary device, the auxiliary device is pulled out after the concrete is initially set, and a concrete retaining wall with the thickness of 20 cm-30 cm is formed after the concrete strength reaches the design strength, so that the hole is drilled again directly in the concrete retaining wall. The application not only greatly reduces the consumption of concrete and reduces the waste of resources, but also increases the specific surface area of the released hydration heat when the concrete is hardened, reduces the existence of temperature stress, effectively ensures the construction quality and has high cost performance of construction facilities; the auxiliary device can be suitable for the collapsed hole backfilling treatment of various conditions and can be recycled.

Description

Hole collapse backfill construction method and backfill auxiliary device for bored pile
Technical Field
The application belongs to the technical field of pile foundation drilling construction, and particularly relates to a drilling pile collapse backfill construction method and a backfill auxiliary device.
Background
Hole collapse of a drilled pile is the most common accident, and can occur during the drilling process or after the hole is formed. Moreover, the quality of the bored pile is greatly influenced by the collapse of the hole, and the safety of constructors and equipment can be endangered when the collapse of the hole is serious, so that the in-situ treatment of the bored pile accident is required in time.
At present, the main working procedures of the bored pile comprise: 1. measuring and paying off; 2. forming holes; 3. the reinforcement cage is hung to put concrete to be poured into piles, wherein in the pore-forming construction process, poor strata such as sand layers, pebble soil and the like are frequently encountered, so that the problem of pore collapse of different degrees is caused. Backfill clay or sheet stones are often adopted, the hole piles are stood for a period of time which is not equal for one month or half year, and the drill bit is re-drilled after the precipitation in the holes is compact, and the drill bit is repeatedly ground and extruded in a collapse area to backfill granules in the drilling process so as to form a compact hole inner protection wall. The soil body of the collapse body area is compacted by external force, so that labor and time are wasted, the treatment effect is general, and the small-scale collapse condition in the hole cannot be avoided when the drilling is performed again; when the rock face after backfilling by the rock is inclined greatly, the drill bit is easy to swing and hit the casing or the hole wall, so that the phenomena of hole deviation or hole collapse, drill sticking and the like are caused.
When the hole collapse is carried out, the in-situ backfilling concrete forms a protection wall after solidification, and re-drilling is a common emergency treatment measure, the treatment effect is good, the treatment process is simple, the construction time is effectively reduced, the construction efficiency is improved, the method is a treatment method with higher neutral price in the hole collapse treatment, and the concrete protection ring can be formed in the hole to prevent the hole collapse phenomenon from happening again, so that the method has wide application value.
The Chinese patent No. 113738272A provides a rotary drilling construction method for pile foundations in gravel areas with easy hole collapse, which belongs to the technical field of building construction, and comprises the steps of construction preparation, rotary drilling and boring, concrete backfilling, secondary drilling, continuous drilling, pile foundation pouring and the like, wherein the construction preparation step comprises the steps of instrument preparation, construction scheme making and emergency preparation, the concrete backfilling step further comprises the steps of erecting pouring guide pipes and pouring plain concrete, and the plain concrete is C20 fine stone concrete. However, the concrete is directly backfilled in the collapsed hole, and then the core of the concrete is drawn out, so that the time and the labor are wasted, the concrete is wasted, the construction cost is high and the social resource is wasted.
Disclosure of Invention
The application provides a bored pile hole collapse backfilling construction method and a backfilling auxiliary device, which are used for solving the problems that the traditional treatment mode is labor-consuming, the treatment effect is general, the hole collapse can occur again during re-boring, the consumption of directly backfilling concrete is large, the construction cost is high, the social resource is wasted and the like.
The application is realized by adopting the following technical scheme: when the hole collapse occurs in the drilling process, an auxiliary device is erected in the drill hole after the hole collapse is cleaned, concrete is backfilled between the drill hole and the auxiliary device, the auxiliary device is pulled out after the initial setting of the concrete, and after the strength of the concrete reaches the design strength, a concrete retaining wall of 20 cm-30 cm is formed, and the hole is directly re-drilled in the concrete retaining wall.
Further, the bottom of the auxiliary device is embedded into the soil body by at least 10cm.
Further, before the auxiliary device is erected in the drill hole, a release agent is smeared on the outer surface of the auxiliary device.
Further, prior to erecting the auxiliary device in the borehole, the technical grade endoscope is used for checking the specific conditions inside the collapsed borehole, including the position and the height, and the auxiliary device with the corresponding height is assembled according to the position and the height.
Further, the auxiliary device comprises a top connector end, a plurality of splicing parts and a bottom fixed end which are sequentially connected from top to bottom;
the top joint end is of a truncated cone-shaped structure, and a rotary drilling machine drill rod base is arranged at the top of the top joint end;
the splicing part comprises an upper fixed section, a lower fixed section and a plurality of middle splicing sections, wherein the upper fixed section is fixedly connected with the joint end at the top, the lower fixed section is fixedly connected with the fixed end at the bottom, the upper fixed section, the lower fixed section and the middle splicing sections are detachably connected, and the middle splicing sections are spliced;
the bottom stiff end is the arc structure, and the bottom edge equidistance of bottom stiff end is equipped with 4 axial sawtooth heads.
Further, the top joint end adopts the sawtooth structure concatenation with splice, two adjacent splice and bottom stiff end, and the inside of splice is through buckle fixed connection.
Further, the outer diameter of the auxiliary device is 20 cm-30 cm smaller than the inner diameter of the drill hole.
Further, the thickness of the auxiliary device is 4-12mm.
Further, the length of the sawtooth head at the bottom fixed end is 5 cm-10 cm.
Further, the heights of the upper fixing section, the lower fixing section and the middle splicing section of the splicing part are 60cm.
Compared with the prior art, the application has the beneficial effects that:
1. according to the application, before backfilling concrete, auxiliary equipment is erected in the drill hole, the auxiliary equipment is embedded into soil at the bottom of the drill hole, the auxiliary equipment is used as an internal mold when the concrete is backfilled at the collapsed position, and the auxiliary equipment can be pulled out for re-drilling after the initial setting of the concrete; in addition, the concrete is convenient to express solidification, meanwhile, the construction of the concrete core part is less drawn out, the construction period is greatly shortened, and the construction efficiency is improved;
2. the auxiliary device is simple to manufacture, has less material consumption, is formed by splicing the top joint end, the plurality of splicing parts and the bottom fixed end, can select the splicing parts with corresponding sections to splice to form the auxiliary device with corresponding height according to the depth of the collapsed holes, can be suitable for the collapsed hole backfill treatment under various conditions, can be repeatedly used, and has remarkable economic and social benefits.
Drawings
FIG. 1 is a schematic diagram of an auxiliary device according to the present application;
FIG. 2 is a schematic view of backfilling concrete with an auxiliary device at the hole collapse site of the present application;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is a schematic connection diagram of a splice;
in the figure: 1. the drilling rod base of the rotary drilling machine comprises a drilling rod base, a top joint end, a splicing part, an upper fixing section, a middle splicing section, a lower fixing section, a bottom fixing end, a sawtooth head, a general collapse hole, a special collapse hole, backfill concrete, an auxiliary device and a buckle.
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which is to be read in light of the specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the application to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the application, are not intended to be critical to the essential characteristics of the application, but are intended to fall within the spirit and scope of the application. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the application, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the application may be practiced.
Referring to fig. 1 to 3, the present application provides a technical solution: when a hole collapse occurs in the drilling process, an auxiliary device 9 is erected in a drill hole after the hole collapse (the broken soil in the hole collapse is cleaned), the middle splicing section 3.2 with proper sections is selected according to the detected hole collapse condition, the auxiliary device 9 is assembled, the bottom of the auxiliary device 9 is embedded into soil, concrete is backfilled between the drill hole and the auxiliary device 9, the concrete is low-grade concrete, the excessive concrete is removed during re-drilling, for the special hole collapse 7 condition, a cavity collapsing obliquely upwards occurs at the hole collapse position, an expansion agent is properly added in the concrete, the special hole collapse 7 is fully filled with the backfilled concrete, the treatment effect is ensured, the auxiliary device 9 serves as an inner mold during backfilling of the concrete, the concrete has larger surface area and higher hardening speed compared with the direct backfilling of the concrete; and after the concrete is initially set, pulling out the auxiliary device 9, connecting the rotary excavator drill rod base 1 of the auxiliary device 9 with a rotary excavator, pulling out the auxiliary device 9 by the rotary excavator, and forming a concrete retaining wall of 20 cm-30 cm after the concrete strength reaches the design strength, and directly re-drilling the inside of the concrete retaining wall until the design elevation is reached.
The bottom of the auxiliary device 9 is embedded with at least 10cm of soil body, so as to prevent concrete from being poured into the auxiliary steel casing and ensure the stability of the steel casing auxiliary device when the concrete is backfilled.
Before erecting auxiliary device 9 in the drilling, smear release agent on auxiliary device 9 surface, be convenient for directly extract auxiliary device 9 after the post backfill concrete initial setting, utilize dig the machine soon in time with the steel pile casing pull out, avoid causing the influence to follow-up process construction.
Before the auxiliary device 9 is erected in the drill hole, the technical grade endoscope is used for checking the specific conditions inside the collapsed hole, wherein the conditions comprise the position and the height, and the auxiliary device 9 with the corresponding height is assembled according to the position and the height; when the industrial endoscope is used, the probe of the endoscope can be first inserted into the collapsed hole part by using a proper guiding tool, and then the probe angle is adjusted or the probe type is changed, so that the probe irradiation direction of the endoscope is changed, and the detailed collapsed hole internal condition is obtained.
The auxiliary device 9 comprises a top connector end 2, a splicing part 3 and a bottom fixed end 4 which are sequentially connected from top to bottom;
the top joint end 2 is of a round table-shaped structure and is used for being transited from a large diameter section of the splicing part 3 to a small diameter section of the rotary drilling machine drilling rod base 1, so that the rotary drilling machine drilling rod base 1 is convenient to weld with the rotary drilling machine drilling rod base 1, the rotary drilling machine drilling rod base 1 is connected with a rotary drilling machine, the rotary drilling machine drilling rod base 1 is matched with a joint of the rotary drilling machine, stable connection is formed, the operation is convenient, the rotary drilling machine is utilized for embedding an auxiliary device 9 into a soil body, and fixing is carried out, so that the stability of the steel casing auxiliary device 9 is ensured when concrete is backfilled; and the auxiliary device 9 is pulled out by the rotary digging machine;
the splicing part 3 comprises an upper fixing section 3.1, a lower fixing section 3.3 and a plurality of middle splicing sections 3.2, wherein the upper fixing section 3.1 is fixedly connected with the top connector end 2, the lower fixing section 3.3 is fixedly connected with the bottom fixing end 4, the upper fixing section 3.1, the lower fixing section 3.3 and the middle splicing sections 3.2 are detachably connected, and the middle splicing sections 3.2 are spliced to form auxiliary devices 9 with different heights, so that the auxiliary devices are applicable to collapse holes with different depths;
the bottom fixed end 4 is of an arc-shaped structure, and 4 axial sawtooth heads 5 are arranged at equal intervals on the bottom edge of the bottom fixed end 4.
As shown in fig. 4, the top connector end 2 and the splicing part 3, two adjacent splicing parts 3, and the splicing part 3 and the bottom fixed end 4 are spliced by adopting a saw-tooth structure, and the inside of the splicing part is fixedly connected through a buckle 10; the form is similar to box buckle, and a set of buckle is installed to each section sawtooth department, fully fixes both ends concatenation, and convenient operation, concatenation are firm and stable.
The outer diameter of the auxiliary device 9 is 20 cm-30 cm smaller than the inner diameter of the drilled hole, namely, a concrete retaining wall of 20 cm-30 cm is formed, the secondary drilling is not affected on the premise of saving concrete, if the outer diameter of the auxiliary device is smaller than 20cm, the inflow speed of the concrete and the fullness of the concrete can be affected, and the reinforcing effect is affected.
The thickness of the auxiliary device 9 is 4-12mm, if necessary, the auxiliary device 9 can be thickened according to the aperture of the bored pile, the embedding method and the depth, and the auxiliary device 9 is made of a common steel casing.
The length of the sawtooth head 5 of the bottom fixing end 4 is 5 cm-10 cm, so that the bottom of the auxiliary device 9 is conveniently embedded into soil, and the stability of the auxiliary device 9 in concrete backfilling is ensured.
The heights of the upper fixing section 3.1, the lower fixing section 3.3 and the middle splicing section 3.2 of the splicing part 3 are 60cm, and the splicing quantity is controlled, so that the splicing part is selected according to different conditions of hole collapse.
Through long-term construction experience, when the personnel of the company study and analyze to adopt concrete backfill, only concrete close to the hole wall position actually plays a role of protecting the wall, the concrete backfilled in the middle of the hole is an excessive part, and the larger the hole diameter of the bored pile is, the more serious the waste of the concrete is, so that a disposal method capable of solving the problems is required. In order to further illustrate the application effect of the method and the auxiliary device of the present application, the following engineering examples are specifically listed for illustration:
the three longitudinal lines K6-K12 frame beam pile foundation K6-K12 frame beams of Chongqing city are positioned at the three longitudinal line tail, the thickness of the pile foundation position coverage of the K6-K11 shaft is 5.5-11.3 m, the thickness change is large, the groundwater is loose layer pore water and bedrock crack water, the water content is high, the collapse rate in the construction process is up to 50%, the concrete pouring is completed at the beginning of 2020-2021 at the end of 4 months by adopting the construction technology of the patent, and the pile length is 7-25 m. All pile inspection is qualified, the construction period is safe, the quality is controllable, the construction period also meets the requirements of construction units, and compared with the traditional construction method, the pile inspection method is economical, and good social benefit and economic benefit are obtained.
The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (7)

1. A bored pile collapse backfill construction method is characterized in that: when the hole collapse occurs in the drilling process, an auxiliary device (9) is erected in the drill hole after the hole collapse is cleaned, concrete is backfilled between the drill hole and the auxiliary device (9), the auxiliary device (9) is pulled out after the initial setting of the concrete, and after the strength of the concrete reaches the design strength, a concrete retaining wall of 20 cm-30 cm is formed, and the hole is drilled again directly in the concrete retaining wall;
before the auxiliary device (9) is erected in the drilling hole, the technical grade endoscope is used for checking the specific conditions inside the collapsed hole, wherein the conditions comprise the position and the height, and the auxiliary device (9) with the corresponding height is assembled according to the position and the height;
the auxiliary device (9) comprises a top connector end (2), a plurality of splicing parts (3) and a bottom fixed end (4) which are sequentially connected from top to bottom; the top joint end (2) is of a truncated cone-shaped structure, and a rotary excavator drill rod base (1) is arranged at the top of the top joint end (2); the splicing part (3) comprises an upper fixing section (3.1), a lower fixing section (3.3) and a plurality of middle splicing sections (3.2), wherein the upper fixing section (3.1) is fixedly connected with the top joint end (2), the lower fixing section (3.3) is fixedly connected with the bottom fixing end (4), the upper fixing section (3.1), the lower fixing section (3.3) and the middle splicing sections (3.2) are detachably connected, and the middle splicing sections (3.2) are spliced; the bottom fixing end (4) is of an arc-shaped structure, and 4 axial sawtooth heads (5) are equidistantly arranged at the bottom edge of the bottom fixing end (4);
the top connector end (2) adopts the sawtooth structure to splice with splice (3), two adjacent splice (3) and bottom stiff end (4), and buckle (10) fixed connection is passed through to the inside of splice.
2. The method for backfilling collapsed holes of a bored pile according to claim 1, wherein the method comprises the following steps: the bottom of the auxiliary device (9) is embedded into the soil body by at least 10cm.
3. The method for backfilling collapsed holes of a bored pile according to claim 1 or 2, which is characterized in that: and before the auxiliary device (9) is erected in the drilling hole, coating a release agent on the outer surface of the auxiliary device (9).
4. An auxiliary device for a bored pile collapse backfill construction method according to claim 3, which is characterized in that: the outer diameter of the auxiliary device (9) is 20 cm-30 cm smaller than the inner diameter of the drill hole.
5. An auxiliary device for a bored pile collapse backfill construction method according to claim 4, which is characterized in that: the thickness of the auxiliary device (9) is 4-12mm.
6. An auxiliary device for a bored pile collapse backfill construction method according to claim 5, which is characterized in that: the length of the sawtooth head (5) of the bottom fixed end (4) is 5 cm-10 cm.
7. An auxiliary device for a bored pile collapse backfill construction method as set forth in claim 6, which is characterized in that: the heights of the upper fixing section (3.1), the lower fixing section (3.3) and the middle splicing section (3.2) of the splicing part (3) are 60cm.
CN202210629883.7A 2022-06-06 2022-06-06 Hole collapse backfill construction method and backfill auxiliary device for bored pile Active CN115030170B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404703A1 (en) * 1989-06-21 1990-12-27 Raymond Louis Foundation piles, methods, tools and devices for the construction of these piles
JPH08209686A (en) * 1994-12-05 1996-08-13 Masaharu Ookawa Pile head processing tool and pile head processing construction method for cast-in-place pile
JP2009007836A (en) * 2007-06-28 2009-01-15 Takenaka Komuten Co Ltd Bucket for diameter enlarging excavation, excavation method for middle enlarged diameter part, and excavation method for enlarged bottom part
CN205475205U (en) * 2016-03-01 2016-08-17 中国建筑第八工程局有限公司 Dig bored concrete pile soon and meet hole backfill device that collapses
CN110387880A (en) * 2019-07-29 2019-10-29 中铁十二局集团建筑安装工程有限公司 A kind of bored pile construction method
CN111764819A (en) * 2020-05-11 2020-10-13 中交路桥建设有限公司 Buried drilling treatment method for collapsed hole of pile foundation in aeolian sand stratum
CN113802544A (en) * 2021-10-28 2021-12-17 福建省兴岩建设集团有限公司 Concrete pouring pile foundation anti-broken pile processor and construction method thereof
CN114351693A (en) * 2022-03-02 2022-04-15 四川志德岩土工程有限责任公司 Collapse hole underpinning device for rotary excavating cast-in-place pile and underpinning construction method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0404703A1 (en) * 1989-06-21 1990-12-27 Raymond Louis Foundation piles, methods, tools and devices for the construction of these piles
JPH08209686A (en) * 1994-12-05 1996-08-13 Masaharu Ookawa Pile head processing tool and pile head processing construction method for cast-in-place pile
JP2009007836A (en) * 2007-06-28 2009-01-15 Takenaka Komuten Co Ltd Bucket for diameter enlarging excavation, excavation method for middle enlarged diameter part, and excavation method for enlarged bottom part
CN205475205U (en) * 2016-03-01 2016-08-17 中国建筑第八工程局有限公司 Dig bored concrete pile soon and meet hole backfill device that collapses
CN110387880A (en) * 2019-07-29 2019-10-29 中铁十二局集团建筑安装工程有限公司 A kind of bored pile construction method
CN111764819A (en) * 2020-05-11 2020-10-13 中交路桥建设有限公司 Buried drilling treatment method for collapsed hole of pile foundation in aeolian sand stratum
CN113802544A (en) * 2021-10-28 2021-12-17 福建省兴岩建设集团有限公司 Concrete pouring pile foundation anti-broken pile processor and construction method thereof
CN114351693A (en) * 2022-03-02 2022-04-15 四川志德岩土工程有限责任公司 Collapse hole underpinning device for rotary excavating cast-in-place pile and underpinning construction method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
桥梁钻孔桩回填素混凝土防塌孔施工技术;樊立志;;山西建筑(第03期);全文 *

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