CN114182749A - Karst complex geological pile foundation construction process and karst complex geological pile foundation - Google Patents
Karst complex geological pile foundation construction process and karst complex geological pile foundation Download PDFInfo
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- CN114182749A CN114182749A CN202111640042.8A CN202111640042A CN114182749A CN 114182749 A CN114182749 A CN 114182749A CN 202111640042 A CN202111640042 A CN 202111640042A CN 114182749 A CN114182749 A CN 114182749A
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- 238000010276 construction Methods 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 238000005553 drilling Methods 0.000 claims description 32
- 239000004927 clay Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 7
- 238000011161 development Methods 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 230000003116 impacting effect Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 6
- 238000013517 stratification Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 210000000434 stratum corneum Anatomy 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
-
- 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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The application provides a karst complicated geology pile foundation construction process and karst complicated geology pile foundation, and construction process includes following step: acquiring the geological types of a plurality of pile foundation construction stratums distributed in the extending direction of a pile foundation to be set, wherein the geological types of at least two pile foundation construction stratums in the plurality of pile foundation construction stratums are different; and respectively taking corresponding pile foundation construction measures for a plurality of pile foundation construction stratums. Can carry out the testing and analysis to the geology of construction area earlier before the pile foundation construction, acquire the parameter information of a plurality of different geological stratification that the pile foundation spaned earlier, according to the corresponding pile foundation construction scheme of the integrated design of multiple geology type to improve the efficiency of construction, improve construction quality.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction process of a karst complex geological pile foundation and the karst complex geological pile foundation.
Background
At present, pile foundations can be divided into precast piles and cast-in-place piles, the precast piles are used for driving prefabricated reinforced concrete piles into addresses through pile drivers, so that materials can be saved, the strength is high, the precast pile drivers are suitable for buildings with higher requirements, and the precast pile drivers have the defects of high construction difficulty and long construction time limited by the number of machines; the cast-in-place pile is drilled in a construction site, and the steel bars are placed into the cast-in-place concrete for fixing and forming after the required depth is reached, so that the cast-in-place pile has the advantages of low construction difficulty, particularly manual hole digging piles, no limitation of the number of machines, simultaneous construction of all the piles and great time saving. In the prior art, due to the fact that geology is complex, pile foundations generally span multiple geology of different types, and construction operations such as drilling and wall protection are carried out only by means of worker experience during pile foundation construction.
The inventor researches and discovers that the prior art at least has the following defects for pile foundation construction of complex geology:
and manual experience judgment is performed, the efficiency is low, and the error is large.
Disclosure of Invention
The invention aims to provide a karst complex geological pile foundation construction process and a karst complex geological pile foundation, which can reduce errors generated in the construction process, improve the construction accuracy, improve the operation efficiency and improve the pile foundation forming quality.
The embodiment of the invention is realized by the following steps:
in a first aspect, the invention provides a construction process of a karst complex geological pile foundation, which comprises the following steps:
acquiring the geological types of a plurality of pile foundation construction strata which are distributed in the extending direction of a pile foundation to be set, wherein the geological types of at least two pile foundation construction strata in the plurality of pile foundation construction strata are different;
and respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums.
In an optional implementation mode, the multiple pile foundation construction strata arranged in the extending direction of the pile foundation to be set are obtained, the geological soil sample of the area where the pile foundation to be set is located is analyzed, corresponding geology is obtained according to the analysis of the geological soil sample, and the boundary of the adjacent geology is determined.
In an optional embodiment, the step of respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums comprises drilling in a mode of punching or rotary drilling to obtain a first hole when the pile foundation construction stratum is in a quicksand layer geology, and then embedding a steel casing in the first hole.
In an optional embodiment, the step of embedding the steel casing in the hole includes inserting the steel casing into the first hole, knocking the steel casing until the steel casing does not reach the first hole or a knocked end of the steel casing turns up, and moving the steel casing relative to the first hole by drilling.
In an optional embodiment, the step of respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums comprises drilling to obtain a second hole in a mode of punching or rotary drilling when the pile foundation construction stratum is karst cave geology and the depth of the karst cave geology is more than 3m, and then burying a double-steel casing in the second hole.
In an optional implementation mode, the step of embedding the double-steel casing into the second hole comprises the following step of the inner steel casing according to the drilling progress of the pile foundation, inserting the outer steel casing into the bottom of the karst cave after the inner steel casing enters the karst cave, and then drilling.
In an optional embodiment, the step of respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction strata includes that when the pile foundation construction strata are karst cave geology and the depth of the karst cave geology is less than or equal to 3m, impact pore forming is adopted to obtain a third hole, and then block stone clay is filled in the third hole to form a pore protection wall, wherein the weight ratio of the block stone to the clay is (2:1) - (7: 4).
In an optional embodiment, the step of respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums comprises the steps of adopting a mode of impacting pore-forming or rotary drilling pore-forming to obtain a fourth hole when the pile foundation construction stratums are karst pole development sections, and adopting backfilled clay to carry out wall-making filling when slurry seepage occurs in the drilling process.
In an alternative embodiment, the specific gravity of the slurry wall of the backfilled clay is controlled to be 1.2-1.4.
In a second aspect, the invention provides a karst complex geological pile foundation which is prepared by adopting the karst complex geological pile foundation construction process in any one of the embodiments.
The embodiment of the invention has the beneficial effects that:
in summary, the karst complex geology pile foundation construction process provided by this embodiment carries out detection and analysis to the geology of pile foundation position earlier before carrying out the pile foundation construction to obtain a plurality of pile foundation construction stratums, a plurality of pile foundation construction stratums are arranged in proper order in the extending direction of pile foundation, and the geological conditions on two adjacent pile foundation construction stratums at least are different. Then, according to the corresponding pile foundation construction measure of the pile foundation construction stratum design of each layer, so, in pile foundation construction process, pile foundation construction data is accurate, and can in time take measures to the proruption state effectively, construction safety, the efficiency of construction is high, the pile foundation high quality that finally prepares and obtains.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flow chart of a construction process of a karst complex geological pile foundation according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection 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 should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
At present, the pile foundation construction of prior art all adopts same kind of drilling mode at complicated topography, and so security and quality all can not obtain guaranteeing, and in pile foundation work progress, the workman judges construction parameter according to the experience to and reply the complex condition that appears in the work progress according to the experience, so, it is inefficient, with high costs.
In view of this, the designer designs a karst complex geology pile foundation construction process, can carry out the detection and analysis to the geology of construction area earlier before the pile foundation construction, obtains the parameter information of a plurality of different geology areas that the pile foundation spaned earlier, designs corresponding pile foundation construction scheme according to the geology area that corresponds to improve efficiency of construction, improve construction quality.
Referring to fig. 1, in this embodiment, a process for constructing a karst complex geological pile foundation includes the following steps:
step s 100: acquiring the geological types of a plurality of pile foundation construction stratums distributed in the extending direction of a pile foundation to be set, wherein the geological types of at least two pile foundation construction stratums in the plurality of pile foundation construction stratums are different;
and step s200, respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums.
The complicated geology pile foundation construction process of karst that this embodiment provided, before carrying out the pile foundation construction, carry out the testing and analysis to the geology of pile foundation position earlier to acquire a plurality of pile foundation construction stratums, a plurality of pile foundation construction stratums are arranged in proper order in the extending direction of pile foundation, and the geological conditions in two at least pile foundation construction stratums are different, should understand, when the pile foundation construction stratum of different geology appears, the pile foundation construction stratum of two different geologies must be adjacent setting. Then, according to the corresponding pile foundation construction measure of the pile foundation construction stratum design of each layer, so, in pile foundation construction process, pile foundation construction data is accurate, and can in time take measures to the proruption state effectively, construction safety, the efficiency of construction is high, the pile foundation high quality that finally prepares and obtains. In addition, different construction measures can be adopted according to different depths in the same geological pile foundation construction stratum.
In this embodiment, optionally, the step of obtaining the geological conditions of the multiple pile foundation construction strata may include inserting an adopting machine into the strata, taking a soil sample or a water quality sample in the geological strata, analyzing the stratum distribution conditions of the pile foundation construction area through the soil sample or the water quality sample or a combination of the soil sample and the water quality sample, analyzing to obtain boundaries of adjacent geology, determining the depth of each geological type, and finally determining the arrangement conditions of multiple different geological types, so as to analyze and obtain the construction measures corresponding to the geological strata according to the arrangement conditions.
In this embodiment, corresponding construction measures can be taken according to different geological layers, and the geological layers may be, but are not limited to, quicksand geological layers, karst cave geological layers, karst polar development section geological layers, and the like.
When the stratum is sand bed geology, adopt to strike the mode drilling that the pore-forming was dug or dug the pore-forming soon and obtain first hole, then bury the steel in first downthehole underground and protect a section of thick bamboo.
Specifically, a pile foundation with a hole phi of 1.5m is drilled in an impact mode, a 1.8m hammer head is adopted to drill the pile foundation to the surface of a rock stratum, a smooth rock surface is chiseled out, and then a crane is adopted to install the pile foundation
And (3) driving the steel casing with the wall thickness of 12mm by using a vibration hammer, repeatedly hammering for 3-5 times, stopping if no footage or curling sign exists after 10 seconds of each time, and starting normal drilling. The mud weight during pre-drilling should be controlled to be 1.30-1.32, for example, the mud weight is set to be 1.30, 1.31 or 1.32, etc. After the steel casing is drilled, the specific gravity of the slurry drilled to other stable layers can be reduced to 1.10-1.20. The slurry enters unstable geology such as a broken zone, karst pole development, marl and the like, and the specific gravity of the slurry is increased to 1.3-1.4. The construction of the rotary drilling rig is the same.
And when the geological formation is karst cave geology and the depth of the karst cave is more than 3m, drilling in a mode of punching or rotary drilling to obtain a second hole, and burying a double-steel protective cylinder in the second hole.
Specifically, according to the geological exploration, the drilling speed is reduced by rotating the drill bit at the position of 1m of the top of the karst cave and the impact drill at the position of 1.5m of the top of the karst cave, and the pressure and the stroke are reduced. And the inner steel casing follows up according to the drilling progress of the pile foundation. After entering the karst cave, an outer steel casing is inserted into the bottom of the karst cave, and then drilling is carried out, so that drilling sticking is avoided. After the rock face is drilled and leveled, the steel casing is embedded and combined with the rock stratum tightly.
When the geological formation is karst cave geology and the depth of the karst cave is less than or equal to 3m, a third hole is obtained by adopting impact hole forming, and then the third hole is filled with lump stone clay to form a hole protection wall, wherein the weight ratio of the lump stone to the clay is (2:1) - (7:4), for example, the weight ratio of the lump stone to the clay is 2, 7/3 or 7/4, and the like. In the actual operation process, according to the geological survey, the drilling depth is reduced at the position of 1m at the top of the karst cave by rotary drilling and at the position of 1.5m at the top of the karst cave by impact drilling, and the pressure and the stroke are reduced.
When stratum corneum is the karst pole development section, also when broken area, adopt to strike the pore-forming or dig the mode of pore-forming soon and acquire the fourth hole, when creeping into the thick liquid in-process appearance, adopt backfill clay to make the wall and fill in the fourth hole. During construction, the mud weight is controlled to be 1.2-1.4, for example, the mud weight is controlled to be 1.2, 1.3 or 1.4, and the like.
It should be noted that, the karst complex geology pile foundation construction process that this embodiment provided, before the construction, to geological exploration back, obtain the condition of arranging of a plurality of stratums on the pile foundation extending direction, according to the degree of depth and the corresponding drilling of type design and dado strategy of every geological stratification to and carry out corresponding construction adjustment according to the condition of arranging of geological stratification, can obtain the pile foundation construction measure of a set of complete reply complex topography finally. Corresponding measures can be taken efficiently when emergencies occur in the construction process, the efficiency is high, and the safety is high.
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 (10)
1. A karst complex geological pile foundation construction process is characterized by comprising the following steps:
acquiring the geological types of a plurality of pile foundation construction strata which are distributed in the extending direction of a pile foundation to be set, wherein the geological types of at least two pile foundation construction strata in the plurality of pile foundation construction strata are different;
and respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums.
2. The karst complex geological pile foundation construction process of claim 1, characterized in that:
the method comprises the steps of obtaining geological types of a plurality of pile foundation construction stratums distributed in the extending direction of a pile foundation to be set, analyzing geological soil samples of an area where the pile foundation to be set is located, analyzing according to the geological soil samples to obtain corresponding geology and determining the boundary of adjacent geology.
3. The karst complex geological pile foundation construction process of claim 1, characterized in that:
the step of respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums comprises the steps of drilling in a mode of punching or rotary drilling to obtain a first hole when the pile foundation construction stratums are in quicksand geological conditions, and then embedding a steel pile casing in the first hole.
4. The karst complex geological pile foundation construction process of claim 3, characterized in that:
the step of embedding the steel casing in the hole comprises the steps of firstly inserting the steel casing into the first hole, knocking the steel casing until the steel casing does not advance or one end of the steel casing which is knocked generates a curled edge, and then moving the steel casing relative to the first hole in a drilling mode.
5. The karst complex geological pile foundation construction process of claim 1, characterized in that:
the step of respectively taking corresponding pile foundation construction measures for the plurality of pile foundation construction stratums comprises the steps of drilling in a mode of punching or rotary drilling to obtain a second hole when the pile foundation construction stratums are karst cave geology and the depth of the karst cave geology is larger than 3m, and then burying a double-steel pile casing in the second hole.
6. The karst complex geological pile foundation construction process of claim 5, wherein:
and the step of embedding the double-steel casing in the second hole comprises the steps that the inner steel casing follows up according to the drilling progress of the pile foundation, after the inner steel casing enters the karst cave, the outer steel casing is inserted into the bottom of the karst cave, and then the inner steel casing is drilled.
7. The karst complex geological pile foundation construction process of claim 1, characterized in that:
the method comprises the steps of respectively taking corresponding pile foundation construction measures for a plurality of pile foundation construction stratums, obtaining a third hole by adopting impact hole forming when the pile foundation construction stratums are karst cave geology and the depth of the karst cave geology is less than or equal to 3m, and then filling block stone clay into the third hole to form a hole protection wall, wherein the weight ratio of the block stone to the clay is (2:1) - (7: 4).
8. The karst complex geological pile foundation construction process of claim 1, characterized in that:
the step of respectively adopting corresponding pile foundation construction measures for the plurality of pile foundation construction stratums comprises the step of adopting a mode of impacting or rotary excavating to form a fourth hole when the pile foundation construction stratums are karst pole development sections, and adopting backfilled clay to carry out wall-making filling when slurry seepage occurs in the drilling process.
9. The karst complex geological pile foundation construction process of claim 8, wherein:
the specific gravity of the slurry wall of the backfilled clay is controlled to be 1.2-1.4.
10. A karst complex geological pile foundation, characterized in that, the karst complex geological pile foundation is prepared by the karst complex geological pile foundation construction process of any of claims 1-9.
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| CN202111640042.8A CN114182749A (en) | 2021-12-29 | 2021-12-29 | Karst complex geological pile foundation construction process and karst complex geological pile foundation |
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| CN202111640042.8A CN114182749A (en) | 2021-12-29 | 2021-12-29 | Karst complex geological pile foundation construction process and karst complex geological pile foundation |
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2021
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