CN118065759A - Double-casing drilling construction process for rotary drilling of sand-rich stratum in riverside region - Google Patents
Double-casing drilling construction process for rotary drilling of sand-rich stratum in riverside region Download PDFInfo
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- CN118065759A CN118065759A CN202410238883.3A CN202410238883A CN118065759A CN 118065759 A CN118065759 A CN 118065759A CN 202410238883 A CN202410238883 A CN 202410238883A CN 118065759 A CN118065759 A CN 118065759A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 48
- 238000010276 construction Methods 0.000 title claims abstract description 46
- 238000005553 drilling Methods 0.000 title claims abstract description 42
- 239000004576 sand Substances 0.000 title claims description 35
- 230000001681 protective effect Effects 0.000 claims abstract description 29
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000011900 installation process Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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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
-
- 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
- E21B12/00—Accessories for drilling tools
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
- E21B19/084—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods with flexible drawing means, e.g. cables
-
- 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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The construction process comprises S1, pouring auxiliary support bases, uniformly arranging at least three auxiliary support bases on the outer side of a pre-drilling position, vertically fixing upright posts on the auxiliary support bases, and arranging fixed pulleys on the tops of the upright posts; s2, arranging a winch on each auxiliary supporting base; s3, processing the outer protective cylinder and the inner protective cylinder; s4, installing an outer protection barrel, wherein the end part of a traction rope on each winch is fixed on a lifting lug of the outer protection barrel in the construction process, and the traction rope on each winch is in a tensioning state in the outer protection barrel installation process and the length from the lifting lug of the outer protection barrel to the winch is kept consistent; s5, installing an inner protection cylinder, and after the outer protection cylinder is installed and rechecked, vibrating the inner protection cylinder once every 3 m; s6, pouring concrete, namely pulling out the inner protective cylinder and then pulling out the outer protective cylinder before initial setting of the concrete after pouring is completed.
Description
Technical Field
The application relates to the field of bridge construction, in particular to a double-casing drilling construction process for rotary drilling of sand-rich stratum in a shore region.
Background
When the pile foundation of the sand-rich stratum in the shore region is constructed, a thicker sand layer needs to be penetrated, and the underground water is extremely rich and easy to collapse holes. The pile casing is embedded deeply, and the resistance generated by friction between the inner wall and the outer wall of the steel pile casing can be greatly increased when penetrating through a sand layer, so that the pile casing is difficult to pull out, the double pile casings are adopted for pile foundation construction, namely, a section of the outer pile casing with the thickness of about 4.5m is driven in advance, so that the friction force generated when the long pile casing is driven and pulled out is reduced, and then the inner pile casing is vibrated and set in place by adopting a pile vibrating hammer. After the hole forming and pouring are completed, the inner protective cylinder and the outer protective cylinder are sequentially pulled out by adopting a pile vibrating hammer in reverse order, and the work is completed before the initial setting of the concrete.
From this present construction unit has adopted two pile casings to creep into construction process, like application number 201921858109.3, and the two pile casings pore-forming structures of open karst geology pile foundation, outer pile casing subsides to the surface soil layer bottom of reaching, and interior pile casing is concentric with outer pile casing, and the subsidence passes the karst development layer, and reinforced concrete pile foundation pours in interior pile casing, and the depths get into the rock base member. The structure can effectively prevent accidents of subsidence and subsidence of the surface soil layer in the construction of the karst geology casing pile foundation, and the outer casing is positioned and centered to the inner casing, so that the subsidence center line deviation of the inner casing caused by geology unevenness is prevented.
The prior art of double pile casings has the difficulty that 1, when the outer pile casings are vibrated, the construction is usually carried out by adopting rotary drilling and drilling holes, a crawler crane and a vibrating hammer in the vibration setting process because of large volume and heavy weight, the outer pile casings cannot be ensured to be vertical no matter what the crawler crane or the vibrating hammer can deviate in the construction process, and the subsequent re-checking is needed, but re-construction adjustment is needed after the deviation is found in the re-checking, the construction amount is large, and the prior problem cannot be avoided; 2. in the stage of pile casing extraction, the mode of vibration hammer is adopted at present and is not very much influenced for the outer pile casing, because the inner pile casing is extracted firstly after pouring is finished, and the stress of the outer pile casing in the extraction process is not very different from the stress of the outer pile casing in the vibration setting, namely the friction force between the outer surface and the sand layer, but for the inner pile casing, the extraction stage of the inner pile casing is required to overcome the friction force between part of the inner pile casing and the sand layer due to the action of the adhesive force between the inner pile casing and the concrete, and the inner pile casing is required to overcome the adhesive force between the inner surface and the concrete, so that the inner pile casing is laborious in the extraction process and cannot be extracted smoothly by only relying on the vibration hammer.
In view of this, the present application requires improvements to the current construction process to overcome the above-mentioned drawbacks.
Disclosure of Invention
The application mainly aims to provide a double-casing drilling construction process for rotary drilling of sand-rich stratum in the region of the beach, which ensures the verticality of the outer casing in the vibration setting process without the need of re-construction after subsequent rechecking, and secondly increases the pulling-out force of the inner casing during pulling-out, thereby facilitating the pulling-out operation of the inner casing after concrete pouring.
In order to achieve the above purpose, in a first aspect, the application provides a construction process for rotary drilling of a sand-rich stratum in a shore region by double casing drilling, comprising the following steps:
S1, pouring auxiliary support bases, uniformly arranging at least three auxiliary support bases on the outer side of a pre-digging drill position, keeping the same horizontal height of all the auxiliary support bases, vertically fixing upright posts on the auxiliary support bases, and arranging fixed pulleys on the tops of the upright posts;
S2, arranging a winch on each auxiliary supporting base;
S3, processing an outer casing and an inner casing, wherein the inner diameter of the outer casing is the pile diameter plus 0.4m, and the inner diameter of the inner casing is the pile diameter plus 0.2m;
S4, installing the outer protection cylinder, constructing by adopting rotary drilling and drilling holes, a crawler crane and a vibrating hammer, fixing the end part of a traction rope on a winch on a lifting lug of the outer protection cylinder in the construction process, wherein the traction rope on each winch is in a tensioning state in the process of installing the outer protection cylinder, and the lengths from the lifting lug of the outer protection cylinder to the winch are kept consistent;
S5, installing an inner protection cylinder, and after the outer protection cylinder is installed and rechecked, vibrating the inner protection cylinder once every 3 m;
S6, pouring concrete, namely pulling out the inner protective cylinder before initial setting of the concrete after pouring is finished, and constructing by using the crawler crane and the vibrating hammer, wherein in the construction process, a traction rope on a winch bypasses the fixed pulley to be fixed with a lifting lug on the inner protective cylinder, and in the pulling out process, the traction rope on each winch is in a tensioning state and the length between the lifting lug of the inner protective cylinder and the winch is kept consistent; after the inner casing is pulled out, the crawler crane and the vibrating hammer are used for construction to pull out the outer casing.
The step S1 comprises embedding foundation bolts, after determining coordinates and elevation of the foundation bolts, welding and fixing a horizontal supporting plate on the foundation bolts, and pouring to form a supporting foundation after fixing foundation reinforcements on the horizontal supporting plate, wherein the upright posts are vertically and fixedly arranged on the upper surface of the supporting foundation.
Further improved is that the upright post is formed on the upper surface of the supporting foundation in a pouring mode.
Further improved is that a guiding structure is arranged between the outer casing and the inner casing.
Further improved is that the guide structure comprises a plurality of guide grooves formed in the inner side wall of the outer casing, the length direction of the guide grooves extends along the length direction of the outer casing, the depth direction of the guide grooves extends along the radial direction of the outer casing, the outer side wall of the inner casing is provided with a plurality of positioning protrusions matched with the guide grooves, the thickness of each positioning protrusion is consistent, and the positioning protrusions are arranged on the outer side wall of the inner casing.
Further improved is that the end part of the positioning bulge is arc-shaped.
Further improved is that a plugging sealing structure is arranged between the upper end part of the outer casing and the inner casing.
Further improved is that the length of the outer protective cylinder is 60% -70% of the thickness of the sand layer, the length of the inner protective cylinder is larger than the thickness of the sand layer, and the contact length of the inner protective cylinder and the sand layer is 30% -40% of the total length of the inner protective cylinder and the sand layer.
The length of the outer protective cylinder is 4.5m, the inner protective cylinder is manufactured by sections, and the length of each section of the inner protective cylinder is 2-3m.
Compared with the prior art, the double-casing drilling construction process for the rotary drilling of the sand-rich stratum in the beach area has the advantages that the auxiliary supporting base with consistent levelness is arranged, so that the outer casing is prevented from shifting in the vibration setting process by using the tension force of each winch in the vibration setting process, the subsequent re-construction is avoided, and in the inner casing pulling-out stage, the traction rope of the winch bypasses the fixed pulley, so that the auxiliary lifting function in the inner casing pulling-out process is realized, and the inner casing can be pulled out smoothly.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:
FIG. 1 is a schematic view of an outer casing vibration;
FIG. 2 is a schematic drawing of an inner casing pull-out;
FIG. 3 is a schematic illustration of an outer casing assembled with an inner casing;
FIG. 4 is a schematic view of an outer casing;
fig. 5 is a schematic view of an inner casing.
Wherein: 1. an outer casing; 2. an inner casing; 3. a guide groove; 4. positioning the bulge; 5. supporting the foundation; 6. a column; 7. a hoist; 8. a fixed pulley; 9. a traction cable; 10. and (5) a crawler crane.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
1-5, The double casing drilling construction process of the rotary drilling of the sand-rich stratum in the shore region comprises the following steps:
S1, pouring auxiliary support bases, uniformly arranging at least three auxiliary support bases on the outer side of a pre-digging drill position, keeping the same horizontal height of all the auxiliary support bases, vertically fixing an upright post 6 on the auxiliary support bases, and arranging a fixed pulley 8 on the top of the upright post 6;
S2, arranging a winch 7 on each auxiliary supporting base;
s3, processing an outer casing 1 and an inner casing 2, wherein the inner diameter of the outer casing 1 is the pile diameter +0.4m, and the inner diameter of the inner casing 2 is the pile diameter +0.2m;
S4, installing the outer protection cylinder 1, constructing by adopting rotary drilling and drilling holes, a crawler crane 10 and a vibrating hammer, wherein the end part of a traction rope 9 on a winch 7 is fixed on a lifting lug of the outer protection cylinder 1 in the construction process, and the traction rope 9 on each winch 7 is in a tensioning state and the length from the lifting lug of the outer protection cylinder 1 to the winch 7 is kept consistent in the installation process of the outer protection cylinder 1;
s5, installing the inner protection cylinder 2, and after the outer protection cylinder 1 is installed and rechecked, vibrating the inner protection cylinder 2 once every 3 m;
S6, pouring concrete, namely removing the inner protection cylinders 2 before initial setting of the concrete after pouring, and constructing by using the crawler crane 10+ vibration hammer, wherein in the construction process, the traction ropes 9 on the windlass 7 bypass the fixed pulleys 8 to be fixed with lifting lugs on the inner protection cylinders 2, and in the removal process, the traction ropes 9 on each windlass 7 are in a tensioning state and the lengths from the lifting lugs of the inner protection cylinders 2 to the windlass 7 are kept consistent; after the inner casing 2 is pulled out, the outer casing 1 is pulled out by construction through the crawler crane 10+ vibration hammer.
It should be noted that, the levelness of each auxiliary supporting base needs to be kept consistent, because it is used for fixing the winch 7, and the length relation of the traction rope 9 on the winch 7 determines the offset degree of the outer casing 1 in the vibration setting process, by ensuring the length of the traction rope 9 on the winch 7, namely the length of the traction rope 9 between the lifting lug and the winch 7, the whole verticality is ensured, and the auxiliary supporting base is in a tensioning state, so that the influence caused by external force in the construction process is avoided, the outer casing 1 is large in volume and heavy in weight, at present, the control cannot be performed in the construction process, only the recheck is performed in the construction process or after the construction is completed, the adjustment is performed in time when the deviation occurs, and in order to ensure the concentricity between the inner casing 2 and the outer casing 1 in the vibration setting process and the verticality of the inner casing 2 in the vibration setting process, because a guide structure is arranged between the guide structure and the outer casing 1, the guide structure comprises a plurality of guide grooves 3 which are arranged on the inner side wall of the outer casing 1, the length direction of the guide grooves 3 extends along the length direction of the outer casing 1, the depth direction of the guide grooves extends along the radial direction of the outer casing 1, the outer side wall of the inner casing 2 is provided with a plurality of positioning bulges 4 which are matched with the guide grooves 3, the thickness of each positioning bulge 4 is consistent, the positioning bulges 4, namely, after the perpendicularity of the outer casing 1 is ensured, the perpendicularity of the inner casing 2 is necessarily consistent with the requirement, and the outer casing 1 is forced by a traction rope 9 on a winch 7, so that the deflection of the outer casing 1 in the process of vibrating the inner casing 2 is avoided, and the inner casing 2 must be removed firstly in terms of dismantling stage, but the dismantling force required by the inner casing 2 is far greater than the force required by vibrating the inner casing 2, because the concrete has adhesive force, at the moment, the traction rope 9 on the winch 7 bypasses the fixed pulley 8 to work, thereby being equivalent to adding a plurality of auxiliary cranes, being convenient for the smooth pulling out of the inner casing 2, and keeping the inner casing 2 vertical in the pulling out process, thereby avoiding the influence of offset on the pile body during the pulling out and reducing unnecessary external resistance caused by the offset.
In this embodiment, preferably, step S1 includes burying anchor bolts, after determining coordinates and elevation of the anchor bolts, welding and fixing a horizontal support plate on the anchor bolts, and casting to form a supporting foundation 5 after fixing foundation reinforcements on the horizontal support plate, where the upright posts 6 are vertically fixed on the upper surface of the supporting foundation 5, and because the heights of the ground on the surface of the sand stratum are inconsistent, the horizontal heights are required to be measured before burying the anchor bolts, and the soil foundation is finished before burying, and the upright posts 6 are cast on the upper surface of the supporting foundation 5.
A guide structure is arranged between the outer casing 1 and the inner casing 2.
The end of the positioning projection 4 is circular in order to reduce the friction between the inner casing 2 and the outer casing 1 during the removal process, while the length of the positioning projection 4 is preferably 10% of the length of the outer casing 1, thereby ensuring guiding and avoiding additional friction resistance.
In order to prevent drill slag from scattering in the gap during drilling construction and increase the frictional resistance of the outer wall during the pile casing pulling-out construction, a sealing structure is arranged between the upper end part of the outer pile casing 1 and the inner pile casing 2, and the sealing structure can preferably fill the gap between the upper end part and the inner pile casing 2 by adopting a sand bag, and the sand bag can be taken out firstly during the pile casing pulling-out construction by only adjusting the upper end part.
In this embodiment, preferably, the length of the outer casing 1 is 60% -70% of the thickness of the sand layer, the length of the inner casing 2 is greater than the thickness of the sand layer, the contact length of the inner casing 2 and the sand layer is 30% -40% of the total length of the inner casing 2, the length of the outer casing 1 is 4.5m, the inner casing 2 is manufactured in sections, and the length of each section of the inner casing 2 is 2-3m.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. The double-casing drilling construction process for the rotary drilling of the sand-rich stratum in the shore region is characterized by comprising the following steps of:
S1, pouring auxiliary support bases, uniformly arranging at least three auxiliary support bases on the outer side of a pre-digging drill position, keeping the same horizontal height of all the auxiliary support bases, vertically fixing upright posts on the auxiliary support bases, and arranging fixed pulleys on the tops of the upright posts;
S2, arranging a winch on each auxiliary supporting base;
S3, processing an outer casing and an inner casing, wherein the inner diameter of the outer casing is the pile diameter plus 0.4m, and the inner diameter of the inner casing is the pile diameter plus 0.2m;
S4, installing the outer protection cylinder, constructing by adopting rotary drilling and drilling holes, a crawler crane and a vibrating hammer, fixing the end part of a traction rope on a winch on a lifting lug of the outer protection cylinder in the construction process, wherein the traction rope on each winch is in a tensioning state in the process of installing the outer protection cylinder, and the lengths from the lifting lug of the outer protection cylinder to the winch are kept consistent;
S5, installing an inner protection cylinder, and after the outer protection cylinder is installed and rechecked, vibrating the inner protection cylinder once every 3 m;
S6, pouring concrete, namely pulling out the inner protective cylinder before initial setting of the concrete after pouring is finished, and constructing by using the crawler crane and the vibrating hammer, wherein in the construction process, a traction rope on a winch bypasses the fixed pulley to be fixed with a lifting lug on the inner protective cylinder, and in the pulling out process, the traction rope on each winch is in a tensioning state and the length between the lifting lug of the inner protective cylinder and the winch is kept consistent; after the inner casing is pulled out, the crawler crane and the vibrating hammer are used for construction to pull out the outer casing.
2. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 1, which is characterized in that: step S1 comprises embedding foundation bolts, after determining coordinates and elevation of the foundation bolts, welding and fixing a horizontal supporting plate on the foundation bolts, and pouring to form a supporting foundation after fixing foundation reinforcements on the horizontal supporting plate, wherein the upright posts are vertically and fixedly arranged on the upper surface of the supporting foundation.
3. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 2, which is characterized in that: and the upright post is cast and formed on the upper surface of the supporting foundation.
4. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 1, which is characterized in that: a guide structure is arranged between the outer protective cylinder and the inner protective cylinder.
5. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 4, which is characterized in that: the guide structure comprises a plurality of guide grooves formed in the inner side wall of the outer protective cylinder, the length direction of each guide groove extends along the length direction of the outer protective cylinder, the depth direction of each guide groove extends along the radial direction of the outer protective cylinder, a plurality of positioning protrusions matched with the guide grooves are arranged on the outer side wall of the inner protective cylinder, the thickness of each positioning protrusion is consistent, and the positioning protrusions are arranged.
6. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 5, which is characterized in that: the end part of the positioning bulge is arc-shaped.
7. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 5, which is characterized in that: and a plugging sealing structure is arranged between the upper end part of the outer casing and the inner casing.
8. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 1, which is characterized in that: the length of the outer protective cylinder is 60% -70% of the thickness of the sand layer, the length of the inner protective cylinder is larger than the thickness of the sand layer, and the contact length of the inner protective cylinder and the sand layer is 30% -40% of the total length of the inner protective cylinder and the sand layer.
9. The construction process for rotary drilling double casing drilling of sand-rich stratum in the shore region according to claim 8, which is characterized in that: the length of the outer casing is 4.5m, the inner casing is manufactured by sections, and the length of each section of the inner casing is 2-3m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410238883.3A CN118065759A (en) | 2024-03-01 | 2024-03-01 | Double-casing drilling construction process for rotary drilling of sand-rich stratum in riverside region |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410238883.3A CN118065759A (en) | 2024-03-01 | 2024-03-01 | Double-casing drilling construction process for rotary drilling of sand-rich stratum in riverside region |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118065759A true CN118065759A (en) | 2024-05-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410238883.3A Pending CN118065759A (en) | 2024-03-01 | 2024-03-01 | Double-casing drilling construction process for rotary drilling of sand-rich stratum in riverside region |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118065759A (en) |
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2024
- 2024-03-01 CN CN202410238883.3A patent/CN118065759A/en active Pending
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