CN113914309A - Laminated karst cave stratum pile foundation construction method - Google Patents
Laminated karst cave stratum pile foundation construction method Download PDFInfo
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- CN113914309A CN113914309A CN202111147221.8A CN202111147221A CN113914309A CN 113914309 A CN113914309 A CN 113914309A CN 202111147221 A CN202111147221 A CN 202111147221A CN 113914309 A CN113914309 A CN 113914309A
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- pile foundation
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 238000005553 drilling Methods 0.000 claims abstract description 55
- 239000011435 rock Substances 0.000 claims abstract description 40
- 235000019994 cava Nutrition 0.000 claims abstract description 6
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000002787 reinforcement Effects 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 15
- 239000002002 slurry Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002356 single layer Substances 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
- 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)
- 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)
- Piles And Underground Anchors (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a laminated karst cave stratum pile foundation construction method, which comprises the following steps: the hole forming of the covering layer is carried out by combining a conventional steel pipe with a rotary drilling slag discharging mode; the rock stratum hole forming is carried out by adopting a core drilling and annular rock sample drilling mode; passing through the laminated karst cave is carried out in a steel pipe follow-up mode with different concentric diameters; drilling to a designed elevation after repeatedly penetrating through the rock stratum and all the laminated karst caves, putting down a reinforcement cage after cleaning holes, pouring concrete, and finishing pile foundation construction. According to the invention, the rotary drilling is adopted to be matched with the steel pipe graded drilling construction, so that the influence on the surrounding environment in the construction process is reduced; in each stage of drilling construction after rock entering, the core drilling and the annular rock sample drilling are combined by adopting drill bits with different diameters, so that the rock entering effect and the construction progress are ensured; the stability of pile foundation drilling in the range of the laminated karst cave is ensured by the following mode of the steel pipes with different diameters; a positioning device is arranged in the steel pipe during operation, so that the verticality of drilling and steel pipe lowering is guaranteed.
Description
Technical Field
The invention relates to the technical field of pile foundation construction, in particular to a laminated karst cave stratum pile foundation construction method.
Background
In the pile foundation construction, if the karst cave appears in the stake hole, very easily influence pile foundation drilling and concrete placement, handle improper can cause to fall to bore, bury the brill, inclined hole, leak thick liquid, accident such as hole collapse takes place, influences construction quality and construction progress, and the pile foundation is handled badly or even influences bridge life and safety, consequently must take effectual measure to guarantee that the pile foundation construction goes on smoothly.
The traditional treatment method of the karst cave stratum at present comprises a grouting method, a backfill method and the like, but the method takes long time and has poor effect when aiming at the laminated karst cave. For example, a thin slurry wall is formed at a karst cave position in a hole through slurry, when concrete is poured, the slurry wall is easily broken due to the fact that the volume weight of the concrete is large and the pressure at the karst cave position in the hole is large, concrete overflow is caused, the pile foundation is prone to having a diameter expansion phenomenon at the position, and the forming quality of the pile foundation is difficult to ensure. For example, backfilling of rubbles or clay inevitably affects the construction progress of the pile foundation, and the size characteristics outside the karst cave in the hole are not detected, so that a large amount of slurry is lost, and the construction period of the pile foundation, the manpower and material resource loss are large.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and overcome a plurality of difficulties encountered in the traditional pile foundation construction, and provides a laminated karst cave stratum pile foundation construction method, which obviously improves the safety and the high efficiency of pile foundation construction.
In order to achieve the purpose, the invention adopts the following technical scheme:
a laminated karst cave stratum pile foundation construction method specifically comprises the following steps:
the hole forming of the covering layer is carried out by combining a conventional steel pipe with a rotary drilling slag discharging mode;
the rock stratum hole forming is carried out by adopting a core drilling and annular rock sample drilling mode;
passing through the laminated karst cave is carried out in a steel pipe follow-up mode with different concentric diameters;
drilling to a designed elevation after repeatedly penetrating through the rock stratum and all the laminated karst caves, putting down a reinforcement cage after cleaning holes, pouring concrete, and finishing pile foundation construction.
When the steel pipe passes through a rock stratum, particularly a laminated karst cave, the subsequent follow-up steel pipe has high rigidity, and in order to ensure the verticality of the drill hole and the downward placement of the steel pipe, a positioning device matched with the steel pipe and a drill bit is adopted to ensure the verticality of the drill hole and the downward placement of the steel pipe.
The positioning device is a ring plate concentric with the steel pipe and the drill bit.
The diameter of the positioning device is 10cm smaller than that of the steel pipe.
The concrete operation mode of the covering layer pore-forming is as follows: in the covering layer, after the steel pipe combined with the positioning device is vibrated and placed on the bottom surface of the covering layer, the steel pipe is matched with a rotary drilling rig to take out the residue soil.
When the rock stratum under the covering layer is penetrated, the core drilling and the annular rock sample drilling are combined due to the hard rock.
The concrete operation mode of rock stratum pore-forming is as follows: the coring method comprises the steps of firstly adopting a first drill bit to core, coring and drilling 1/2 with the aperture being the diameter of a formed hole, and then adopting a second drill bit to perform graded drilling and hole forming, wherein the diameter of the second drill bit is larger than that of the first drill bit.
When the laminated karst cave is penetrated, the development of karst in the laminated karst cave presents a through trend, the height is larger, and the hole collapse risk is larger in the drilling process, so that a following mode of steel pipes with different diameters concentrically is adopted.
The specific operation mode of crossing the laminated karst cave is as follows:
when the first laminated karst cave is crossed, the drill hole is merged into rock stratum below a bottom plate of the first laminated karst cave, a second steel pipe is followed subsequently, the diameter of the second steel pipe is 15cm smaller than that of the drill hole, and smooth descending of the second steel pipe is ensured; when the karst cave penetrates through the second laminated karst cave, the drilled hole is merged into rock stratum below the bottom plate of the second laminated karst cave, a third steel pipe is subsequently followed, the diameter of the third steel pipe is 15cm smaller than that of the drilled hole, the third steel pipe is ensured to be smoothly placed, the diameter of the third steel pipe is smaller than that of the second steel pipe, and the diameter of the second steel pipe is smaller than that of the first steel pipe in the covering layer.
The invention has the beneficial effects that: according to the invention, the rotary drilling is adopted to be matched with the steel pipe graded drilling construction, so that the influence on the surrounding environment in the construction process is reduced;
in each stage of drilling construction after rock entering, the core drilling and the annular rock sample drilling are combined by adopting drill bits with different diameters, so that the rock entering effect and the construction progress are ensured; the stability of pile foundation drilling in the range of the laminated karst cave is ensured by the following mode of the steel pipes with different diameters; a positioning device is arranged in the steel pipe during operation, so that the verticality of drilling and steel pipe lowering is guaranteed.
Drawings
FIG. 1 is a schematic view of the construction of the present invention;
in the figure: 1-a cover layer; 2-a rock formation; 3-stacking karst caves; 4-a steel pipe; 5-a drill bit; 6-a positioning device; 7, rotary drilling;
3.1-first laminated cavern; 3.2-second laminated cavern;
4.1-a first steel tube; 4.2-second steel tube; 4.3-third steel pipe;
5.1 — a first drill bit; 5.2-a second drill bit;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
china has wide distribution of karst landforms and many types, and is rare in the world. Karst caves in karst areas are divided into small, ordinary, large and extra-large sizes according to size. The height of the single-layer cave is less than 2m, and the full-filling karst cave is a small karst cave; half-filled or 2-5m fully-filled two-layer below beaded caverns with the cavern height smaller than 2m are common caverns; the full filling karst cave with the diameter of more than 5m is a large karst cave; the multi-layer beaded karst cave with poor filling is an oversize karst cave. The general karst cave is a common karst cave.
Due to the special form of the karst cave, when pile foundation construction is carried out in a karst area according to the traditional engineering technical method, if a lot of difficulties are met, accidents such as drill falling, buried drill, inclined hole, slurry leakage and hole collapse can be caused due to improper treatment, and the construction quality and the construction progress are influenced.
The bad treatment of the pile foundation even influences the service life and the safety of the bridge, so that effective measures must be taken to ensure the smooth construction of the pile foundation.
In order to overcome various difficulties and barriers in the prior art, the invention provides a laminated karst cave stratum pile foundation construction method, as shown in figure 1, which specifically comprises the following steps:
the hole forming of the covering layer 1 is carried out by combining a conventional steel pipe 4 with a slag discharging mode of a rotary drilling rig 7;
the rock stratum 2 is formed by adopting a core drilling and annular rock sample drilling mode;
the crossing of the laminated karst cave 3 is carried out by adopting a following mode of concentric steel pipes 4 with different diameters;
and repeatedly penetrating through the rock stratum 2 and all the laminated karst caves 3, drilling to a designed elevation, clearing holes, then putting down a reinforcement cage, pouring concrete, and finishing pile foundation construction.
When the steel pipe passes through the rock stratum 2, particularly the laminated karst cave 3, the steel pipe 4 which follows subsequently has high rigidity, and in order to ensure the verticality of the drilled hole and the downward placement of the steel pipe 4, the positioning device 6 matched with the steel pipe 4 and the drill bit 5 is adopted to ensure the verticality of the drilled hole and the downward placement of the steel pipe 4.
The positioning device 6 is a ring plate concentric with the steel pipe 4 and the drill 5.
The diameter of the positioning device 6 is 10cm smaller than that of the steel pipe 4.
The concrete operation mode of the pore-forming of the covering layer 1 is as follows: in the covering layer 1, after the steel pipe 4 combined with the positioning device 6 is placed on the bottom surface of the covering layer 1 in a vibrating mode, the rotary drilling rig 7 is matched to take out the slag soil.
When penetrating the rock stratum 2 below the covering layer 1, the core drilling and the annular rock sample drilling are combined due to the hard rock.
The concrete operation mode of the rock stratum 2 pore-forming is as follows: the core is firstly taken by the first drill bit 5.1, the core drilling hole diameter is 1/2 of the hole-forming diameter, then the second drill bit 5.2 is adopted to carry out graded drilling hole-forming, and the diameter of the second drill bit 5.2 is larger than that of the first drill bit 5.1.
When the laminated karst cave 3 is penetrated, the karst development in the laminated karst cave 3 shows a through trend, the height is larger, and the hole collapse risk is larger in the drilling process, so that the steel pipes 4 with different concentric diameters are adopted in a follow-up mode.
The specific operation mode of crossing the laminated karst cave 3 is as follows:
when the steel pipe passes through the first laminated karst cave 3.1, the drill hole is merged into rock stratum 2 below the bottom plate of the first laminated karst cave 3.1, the second steel pipe 4.2 is followed subsequently, the diameter of the second steel pipe 4.2 is 15cm smaller than that of the drill hole, and smooth downward placement of the second steel pipe 4.2 is ensured; when the steel pipe passes through the second laminated karst cave 3.2, the drilled hole is merged into the rock stratum 2 below the bottom plate of the second laminated karst cave 3.2, the third steel pipe 4.3 is followed, the diameter of the third steel pipe 4.3 is 15cm smaller than that of the drilled hole, the third steel pipe 4.3 is ensured to be smoothly placed, the diameter of the third steel pipe 4.3 is smaller than that of the second steel pipe 4.2, and the diameter of the second steel pipe 4.2 is smaller than that of the first steel pipe 4.1 in the covering layer 1.
In the present invention,
the rotary drilling is matched with the steel pipe 4 for hierarchical drilling construction, so that the influence on the surrounding environment in the construction process is reduced;
in each stage of drilling construction after rock entering, the drill bits 5 with different diameters are adopted for core drilling and combined with annular rock sample drilling, so that the rock entering effect and the construction progress are ensured;
the stability of pile foundation drilling in the range of the laminated karst cave 3 is ensured by adopting a steel pipe 4 follow-up mode with different concentric diameters;
set up positioner 6 in the operation in steel pipe 4, guaranteed the straightness that hangs down that drilling and steel pipe 4 transferred, it is more accurate.
The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, adaptations or uses of the invention, and all such modifications and variations are within the scope of the invention.
Claims (7)
1. A laminated karst cave stratum pile foundation construction method is characterized by comprising the following steps:
the hole forming of the covering layer (1) is carried out by combining a conventional steel pipe (4) with a slag discharging mode of a rotary drilling rig (7);
the hole forming of the rock stratum (2) is carried out by adopting a core drilling and annular rock sample drilling mode;
the crossing of the laminated karst cave (3) is carried out in a following mode by adopting steel pipes (4) with different concentric diameters;
drilling to a designed elevation after repeatedly penetrating through the rock stratum (2) and all the laminated karst caves (3), putting down a reinforcement cage after cleaning holes, and pouring concrete to complete pile foundation construction.
2. The laminated karst cave stratum pile foundation construction method according to claim 1, characterized in that when penetrating through the rock stratum (2) and the laminated karst cave (3), the perpendicularity of drilling and lowering of the steel pipe (4) is ensured by using a positioning device (6) matched with the steel pipe (4) and the drill bit (5).
3. The laminated karst cave stratum pile foundation construction method according to claim 2, wherein the concrete operation mode of the hole forming of the covering layer (1) is as follows: in the covering layer (1), after the steel pipe (4) combined with the positioning device (6) is vibrated and lowered to the bottom surface of the covering layer (1), the rotary drilling rig (7) is matched to take out the residue soil.
4. The laminated karst cave stratum pile foundation construction method according to claim 3, wherein the concrete operation mode of pore-forming of the rock stratum (2) is as follows: the core is firstly taken by a first drill bit (5.1), the core drilling hole diameter is 1/2 of the hole forming diameter, then the second drill bit (5.2) is adopted to carry out graded drilling hole forming, and the diameter of the second drill bit (5.2) is larger than that of the first drill bit (5.1).
5. The laminated karst cave stratum pile foundation construction method according to claim 4, wherein the specific operation mode of traversing the laminated karst cave (3) is as follows: when the steel pipe passes through the first laminated karst cave (3.1), the drilled hole is merged into rock stratum (2) below the bottom plate of the first laminated karst cave (3.1), a second steel pipe (4.2) is followed subsequently, the diameter of the second steel pipe (4.2) is 15cm smaller than that of the drilled hole, and the second steel pipe (4.2) is ensured to be smoothly placed; when the steel pipe passes through the second laminated karst cave (3.2), the drilled hole is merged into rock stratum (2) below the bottom plate of the second laminated karst cave (3.2), a third steel pipe (4.3) is followed subsequently, the diameter of the third steel pipe (4.3) is 15cm smaller than that of the drilled hole, the third steel pipe (4.3) is ensured to be smoothly placed, the diameter of the third steel pipe (4.3) is smaller than that of the second steel pipe (4.2), and the diameter of the second steel pipe (4.2) is smaller than that of the first steel pipe (4.1) in the covering layer (1).
6. The laminated karst cave formation pile foundation construction method according to claim 5, wherein the positioning device (6) is a ring plate concentric with the steel pipe (4) and the drill bit (5).
7. The laminated karst cave formation pile foundation construction method according to claim 6, wherein the diameter of the positioning device (6) is 10cm smaller than that of the steel pipe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111147221.8A CN113914309A (en) | 2021-09-29 | 2021-09-29 | Laminated karst cave stratum pile foundation construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111147221.8A CN113914309A (en) | 2021-09-29 | 2021-09-29 | Laminated karst cave stratum pile foundation construction method |
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| CN113914309A true CN113914309A (en) | 2022-01-11 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100631103B1 (en) * | 2006-04-14 | 2006-10-04 | 주식회사 산하이앤씨 | Grout bag reinforcing method for underground caves |
| CN108411928A (en) * | 2018-03-22 | 2018-08-17 | 中建桥梁有限公司 | One kind passing through multilayer karst cave ultra-deep and large diameter pile foundation boring method |
| 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 |
-
2021
- 2021-09-29 CN CN202111147221.8A patent/CN113914309A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100631103B1 (en) * | 2006-04-14 | 2006-10-04 | 주식회사 산하이앤씨 | Grout bag reinforcing method for underground caves |
| CN108411928A (en) * | 2018-03-22 | 2018-08-17 | 中建桥梁有限公司 | One kind passing through multilayer karst cave ultra-deep and large diameter pile foundation boring method |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 唐毅冠等: "多层溶洞超长冲孔灌注桩多护筒跟进施工方法", 《城市建设理论研究（电子版）》 * |
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Application publication date: 20220111 |