CN113738272A - Rotary drilling hole forming construction method for pile foundation in gravel area with easy hole collapse - Google Patents
Rotary drilling hole forming construction method for pile foundation in gravel area with easy hole collapse Download PDFInfo
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- CN113738272A CN113738272A CN202111309934.XA CN202111309934A CN113738272A CN 113738272 A CN113738272 A CN 113738272A CN 202111309934 A CN202111309934 A CN 202111309934A CN 113738272 A CN113738272 A CN 113738272A
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- 238000005553 drilling Methods 0.000 title claims abstract description 83
- 238000010276 construction Methods 0.000 title claims abstract description 74
- 239000004567 concrete Substances 0.000 claims abstract description 54
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000002787 reinforcement Effects 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000009933 burial Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 abstract description 4
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000009472 formulation Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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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
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterised by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
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- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The invention provides a rotary drilling and pore-forming construction method for a pile foundation in a gravel area with easy hole collapse, which belongs to the technical field of building construction, and comprises the steps of construction preparation, rotary drilling and drilling, concrete backfilling, secondary drilling, continuous drilling, pile foundation pouring and the like, wherein the construction preparation steps comprise equipment preparation, construction scheme formulation, emergency preparation steps, concrete backfilling steps further comprise the steps of erecting a pouring guide pipe and pouring plain concrete, the plain concrete is C20 fine stone plain concrete, the method utilizes the plain concrete to be mixed with the gravel area, improves geological conditions, increases the strength of a hole wall, prevents hole collapse again, improves the speed and quality of the pile foundation drilling, prevents construction rework, saves labor and mechanical cost, reduces economic loss, reduces delay of the collapse on construction period, improves construction efficiency, shortens the construction period, effectively solves the problem that the pile foundation in the large-diameter gravel area with dark current cannot be formed with holes, valuable experience is accumulated for similar projects in the future.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a rotary drilling construction method for a pile foundation in a gravel area with easy hole collapse.
Background
Under the background of continuous social development and scientific and technical progress, the quantity of civil buildings and industrial buildings is more and more, and under the background, the buildings are also gradually developed towards the direction of high-rise, so that the construction technology of building foundation and pile foundation civil engineering faces greater challenges, the quality of the building engineering directly influences the production and life of people, and in the civil engineering construction of the building engineering, due to the excellent engineering performance and higher economic benefit of a pile foundation, the pile foundation technology is widely applied to high-rise buildings, ports, bridges and other engineering, the application rationality and the appropriateness of the technical function play determine the overall quality of the building engineering to a certain extent. The selection of the pile foundation construction scheme needs to consider the type of the pile foundation, the quality requirement of the construction period, the geological condition and the like, and particularly under the complex geological environment, the selection of the pile foundation construction scheme is particularly important.
In part of construction sites, in the construction process of the rotary drilling rig, when the pile foundation construction passes through a gravel layer, because gravels are large and loose, after the hole is drilled to a certain depth, the hole can collapse due to slight disturbance, mud of the retaining wall is easy to run off through the gravels or is dispersed by a dark current, the hole cannot be formed, the progress of engineering construction is greatly influenced, waste of construction machinery and personnel is caused, and the construction cost is increased, so that a construction method for solving the problem that the hole is easy to collapse in a gravel area is urgently needed.
Disclosure of Invention
The embodiment of the invention provides a rotary drilling construction method for a pile foundation in a gravel area with easy collapse, which effectively improves the engineering performance of easy collapse of the gravel area, effectively controls the collapse range, enhances the strength of a hole wall, prevents reworking, improves the speed and quality of hole forming, and reduces economic loss caused by reworking.
In view of the above problems, the technical solution proposed by the present invention is:
a rotary drilling and hole forming construction method for a pile foundation in a gravel area with easy hole collapse comprises the following steps:
s1, construction preparation: completing preparation work in a construction area according to a design construction drawing;
wherein, S11, the instrument is prepared: leveling a field, identifying a rotary digging operation point of a pile foundation according to a construction drawing, hoisting construction machinery and materials to the vicinity of the operation point, checking the construction machinery and cables, and ensuring the use safety;
s12, making a construction scheme: checking a geological survey report, determining the gravel area range, the burial depth and the thickness of the operation points, and preliminarily making a construction scheme of each operation point;
s13, emergency preparation: preparing emergency reinforced concrete and tools according to a construction scheme;
s2, rotary drilling: drilling a hole by using a crawler-type hydraulic rotary drilling machine, constantly paying attention to the soil quality condition of the drilled hole, reducing the drilling speed of the rotary drilling machine when the drilled hole reaches a gravel area until a small-range collapse area is formed in the gravel area, withdrawing a drill bit of the rotary drilling machine, and installing a wellhead casing at the drilled hole;
s3, concrete backfilling: backfilling a collapse area by using emergency plain concrete and waiting for initial setting of the concrete;
wherein, S31, erect and pour the pipe: inserting the bottom of the guide pipe into the drill hole, extending the bottom of the guide pipe to the position above the collapse area, and temporarily fixing the top of the guide pipe and the wellhead casing;
s32, pouring plain concrete: the concrete mixer truck directly pours plain concrete into the collapse area through the top of the guide pipe, the left and right directions of the guide pipe are kept stable during pouring and only can move up and down, and the guide pipe is detached after the pouring is finished and the concrete is solidified;
s4, secondary drilling: drilling again by using a rotary drilling machine, digging out the concrete core filled in the step S3, and forming a concrete retaining wall by the rest part;
s5, drilling is continued: the rotary drilling machine continues to dig the drill hole downwards, if the drill hole collapses, the steps S3-S4 are repeated until the drill hole penetrates through the gravel area, the hole is drilled to the elevation depth, then the hole forming of the pile foundation is completed, and in the drilling process, the quality of the drill hole is checked regularly;
s6, pouring a pile foundation: and (4) cleaning the pile foundation pit degree, putting the pile foundation pit degree into a reinforcement cage and pouring pile foundation concrete after the pile foundation pit degree is qualified through field supervision and acceptance, and waiting for pile foundation forming.
As a preferred technical solution of the present invention, in the step S2, the bore diameter of the rotary drilling machine is greater than the designed pile diameter by 10 cm.
As a preferable technical scheme of the invention, the lifting speed of the drill rod of the rotary drilling machine is 0.5-0.6 m/S when the drill hole reaches the gravel zone in the step S2.
As a preferable technical scheme of the invention, the wellhead casing in the step S2 is made of steel and has the thickness not less than 15 mm.
In a preferred embodiment of the present invention, the plain concrete in step S32 is C20 fine stone concrete.
In a preferred embodiment of the present invention, in step S31, the diameter of the guide pipe is 250mm, the length of the bottom pipe is not less than 4m, the lengths of the rest sections of the guide pipe are 3.5m, and the depth of the bottom of the guide pipe inserted into the concrete is not less than 1m and not more than 6 m.
As a preferred technical solution of the present invention, the method for checking the drilling quality in step S5 includes: and (3) withdrawing the drill bit of the rotary drilling machine every time the drill bit is drilled for 2-3 m, hoisting the reinforcement cage with the outer diameter matched with the designed pile diameter into the drill hole, enabling the reinforcement cage to coincide with the center of the drill hole, and completing the inspection of the diameter and the verticality of the drill hole without hanging and blocking the upper part and the lower part in the hoisting process.
Compared with the prior art, the invention has the beneficial effects that:
(1) the plain concrete is mixed with the gravel area, so that the geological condition is improved, the strength of the hole-forming hole wall is increased, the hole collapse is prevented again, the speed and the quality of pile foundation drilling are improved, the construction rework is prevented, the labor and mechanical cost is saved, and the economic loss is reduced;
(2) the delay of the construction period influenced by hole collapse is reduced, the construction efficiency is improved, and the construction period is shortened;
(3) the difficult problem that the pile foundation in the large-particle-size gravel area with the undercurrent cannot be formed into the hole is effectively solved, and valuable experience is accumulated for subsequent similar engineering.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic flow diagram of a rotary drilling construction method for a pile foundation in a gravel area with easy hole collapse;
FIG. 2 is a schematic structural diagram of a rotary drilling construction method for a pile foundation in a gravel area with easy hole collapse;
description of reference numerals: 100-pile foundation holes; 101-wellhead casing; 102-a gravel zone; 103-collapse zone; 104-a catheter; 105-plain concrete; 200-a rotary drilling machine; 300-concrete mixer truck.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Examples
Referring to the attached drawings 1-2, the invention provides a technical scheme: a rotary drilling and hole forming construction method for a pile foundation in a gravel area with easy hole collapse comprises the following steps:
s1, construction preparation: and finishing preparation work in the construction area according to the design construction drawing.
In this embodiment, the steps are:
s11, preparing the instrument: and (4) field leveling, namely identifying the pile foundation rotary excavating operation point according to a construction drawing, hoisting construction machinery and materials to the position near the operation point, checking the construction machinery and the cables, and ensuring the use safety.
S12, making a construction scheme: and checking a geological survey report, determining the gravel area range, the burial depth and the thickness of the operation points, and preliminarily formulating the construction scheme of each operation point.
S13, emergency preparation: according to the construction scheme, emergency reinforced concrete and tools are prepared in a linking manner.
S2, rotary drilling: and (3) drilling by using a crawler-type hydraulic rotary drilling machine, constantly paying attention to the soil quality condition of the drilled hole, reducing the drilling speed of the rotary drilling machine when the drilled hole reaches a gravel area until a small-range collapse area is formed in the gravel area, withdrawing a drill bit of the rotary drilling machine, and installing a wellhead casing at the drilled hole.
In the step S2, the drilling hole diameter of the rotary drilling machine is 10cm larger than the designed pile diameter, downward exploration of a drilling tool and detection of subsequent hole forming quality are facilitated, the lifting speed of a drill rod of the rotary drilling machine is 0.5-0.6 m/S when a hole is drilled to a gravel area, if the drilling speed is too high, phenomena of drill cone jumping, drill rod swing increasing, drill cone deflection and the like can be caused, the drilling machine is prone to overload damage, low-grade low-speed drilling is suitable, meanwhile, the disturbance influence of the drilling machine on surrounding soil layers can be reduced, the hole collapse generation range is reduced, the well mouth protecting cylinder is made of steel, the thickness of the well mouth protecting cylinder is not smaller than 15mm, the well mouth protecting cylinder plays a role in positioning and protecting a well mouth, stones are prevented from falling into the hole, meanwhile, support is provided for the well mouth, and hole collapse is prevented.
S3, concrete backfilling: and backfilling the collapse area with the emergency plain concrete and waiting for the initial setting of the concrete.
In this embodiment, the steps are:
s31, erecting a pouring guide pipe: and inserting the bottom of the guide pipe into the drill hole, extending the bottom of the guide pipe to be above the collapse area, and temporarily fixing the top of the guide pipe with the wellhead casing.
Wherein, the pipe diameter is 250mm in step S31, bottom tube length is not less than 4m, all the other sections of pipe length is 3.5m, and the pipe bottom inserts the concrete degree of depth and is not less than 1m, and is not more than 6m, and the pipe is used for leading-in the concrete to the pile foundation downthehole, does not educe when guaranteeing that the concrete falls to the hole bottom, can accomplish simultaneously and pull out along with watering, convenient operation, assurance pouring quality.
S32, pouring plain concrete: and (3) directly pouring plain concrete into the collapse area through the top of the guide pipe by the concrete mixer truck, keeping the left and right directions of the guide pipe stable during pouring, only moving up and down, dismantling the guide pipe after pouring, and waiting for concrete solidification.
The plain concrete in the step S32 is C20 fine stone plain concrete, so that the using amount of coarse aggregate is reduced, the cost performance of the used plain concrete is high, the economic benefit is high, the subsequent construction is convenient, and the guide pipe is not moved left and right in the pouring process so as to avoid causing water return accidents in the guide pipe and influencing the construction quality.
S4, secondary drilling: the hole is drilled again using a rotary drill, the concrete core filled in step S3 is fished out, and the remaining portion forms a concrete retaining wall.
S5, drilling is continued: and (4) continuing to dig the drill hole by the rotary drilling machine, if the drill hole collapses, repeating the steps S3-S4 until the drill hole penetrates through the gravel area, drilling to the elevation depth, then completing pile foundation hole forming, and regularly checking the drilling quality in the drilling process.
In step S5, the method for checking the drilling quality is as follows: and (3) withdrawing the drill bit of the rotary drilling machine every time the drill bit is drilled for 2-3 m, hoisting the reinforcement cage with the outer diameter matched with the designed pile diameter into the drill hole, enabling the reinforcement cage to coincide with the center of the drill hole, and completing the inspection of the diameter and the verticality of the drill hole without hanging and blocking the upper part and the lower part in the hoisting process.
S6, pouring a pile foundation: and (4) cleaning the pile foundation pit degree, putting the pile foundation pit degree into a reinforcement cage and pouring pile foundation concrete after the pile foundation pit degree is qualified through field supervision and acceptance, and waiting for pile foundation forming.
Knowing the construction site quality before construction, making instruments and emergency preparation, withdrawing the drill bit after the rotary drilling machine drills for the first time until the gravel area forms a small-range collapse, filling plain concrete, mixing and solidifying the plain concrete and gravel in the well to form a hard protective wall, improving the strength of the gravel area, preventing the secondary collapse of the gravel area from influencing the drilling construction progress, adopting a step-by-step propelling mode, repeatedly pouring the plain concrete once every step-by-step collapse is formed, continuously enhancing the strength of the hole wall of the gravel area, improving the speed of subsequent drilling operation, simultaneously checking the diameter and the vertical degree of a pile foundation well by assembling a reinforcement cage in the construction process, ensuring the forming quality of the hole wall, improving the construction efficiency, saving labor and mechanical cost, placing a prefabricated reinforcement cage in the pile foundation pit after drilling, and pouring the pile foundation for forming, the construction operation of the pile foundation is completed, and the problem that the pile foundation in the large-particle-size gravel area with the undercurrent cannot be formed into holes is effectively solved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The rotary drilling hole forming construction method for the pile foundation in the gravel area with the easy-to-collapse holes is characterized by comprising the following steps of:
s1, construction preparation: completing preparation work in a construction area according to a design construction drawing;
wherein, S11, the instrument is prepared: leveling a field, identifying a rotary digging operation point of a pile foundation according to a construction drawing, hoisting construction machinery and materials to the vicinity of the operation point, checking the construction machinery and cables, and ensuring the use safety;
s12, making a construction scheme: checking a geological survey report, determining the gravel area range, the burial depth and the thickness of the operation points, and preliminarily making a construction scheme of each operation point;
s13, emergency preparation: preparing emergency reinforced concrete and tools according to a construction scheme;
s2, rotary drilling: drilling a hole by using a crawler-type hydraulic rotary drilling machine, constantly paying attention to the soil quality condition of the drilled hole, reducing the drilling speed of the rotary drilling machine when the drilled hole reaches a gravel area until a small-range collapse area is formed in the gravel area, withdrawing a drill bit of the rotary drilling machine, and installing a wellhead casing at the drilled hole;
s3, concrete backfilling: backfilling a collapse area by using emergency plain concrete and waiting for initial setting of the concrete;
wherein, S31, erect and pour the pipe: inserting the bottom of the guide pipe into the drill hole, extending the bottom of the guide pipe to the position above the collapse area, and temporarily fixing the top of the guide pipe and the wellhead casing;
s32, pouring plain concrete: the concrete mixer truck directly pours plain concrete into the collapse area through the top of the guide pipe, the left and right directions of the guide pipe are kept stable during pouring and only can move up and down, and the guide pipe is detached after the pouring is finished and the concrete is solidified;
s4, secondary drilling: drilling again by using a rotary drilling machine, digging out the concrete core filled in the step S3, and forming a concrete retaining wall by the rest part;
s5, drilling is continued: the rotary drilling machine continues to dig the drill hole downwards, if the drill hole collapses, the steps S3-S4 are repeated until the drill hole penetrates through the gravel area, the hole is drilled to the elevation depth, then the hole forming of the pile foundation is completed, and in the drilling process, the quality of the drill hole is checked regularly;
s6, pouring a pile foundation: and (4) cleaning the pile foundation pit degree, putting the pile foundation pit degree into a reinforcement cage and pouring pile foundation concrete after the pile foundation pit degree is qualified through field supervision and acceptance, and waiting for pile foundation forming.
2. The construction method for rotary drilling of the pile foundation in the gravel region with the easy collapse hole according to claim 1, wherein in the step S2, the drilling hole diameter of the rotary drilling machine is 10cm larger than the designed pile diameter.
3. The construction method for rotary drilling of the pile foundation in the gravel region with the easy hole collapse according to claim 1, wherein the lifting speed of the drill rod of the rotary drilling machine when the hole is drilled to the gravel region in the step S2 is 0.5-0.6 m/S.
4. The construction method for rotary drilling of the pile foundation in the gravel area with the easy-to-collapse holes according to claim 1, wherein the wellhead casing in the step S2 is made of steel and has a thickness not less than 15 mm.
5. The construction method for rotary drilling of the pile foundation in the gravel area with the easy-to-collapse holes as claimed in claim 1, wherein the plain concrete in the step S32 is C20 fine plain concrete.
6. The construction method for rotary drilling of the pile foundation in the gravel region with the easy-to-collapse holes according to claim 1, wherein in the step S31, the diameter of the guide pipe is 250mm, the length of the bottom pipe is not less than 4m, the lengths of the rest sections of the guide pipe are 3.5m, and the depth of the bottom of the guide pipe inserted into the concrete is not less than 1m and not more than 6 m.
7. The construction method for rotary drilling of the pile foundation in the gravel area with the easy-to-collapse holes according to claim 1, wherein the drilling quality is checked in the step S5 in a mode that: and (3) withdrawing the drill bit of the rotary drilling machine every time the drill bit is drilled for 2-3 m, hoisting the reinforcement cage with the outer diameter matched with the designed pile diameter into the drill hole, enabling the reinforcement cage to coincide with the center of the drill hole, and completing the inspection of the diameter and the verticality of the drill hole without hanging and blocking the upper part and the lower part in the hoisting process.
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Cited By (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114293907A (en) * | 2021-12-29 | 2022-04-08 | 云南建投第五建设有限公司 | Pile foundation pore-forming construction method under boulder water-out stratum condition |
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