CN111236214A - Construction method for constructing secant pile by lengthening protective cylinder of rotary drilling rig - Google Patents
Construction method for constructing secant pile by lengthening protective cylinder of rotary drilling rig Download PDFInfo
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- CN111236214A CN111236214A CN202010059115.3A CN202010059115A CN111236214A CN 111236214 A CN111236214 A CN 111236214A CN 202010059115 A CN202010059115 A CN 202010059115A CN 111236214 A CN111236214 A CN 111236214A
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- pile
- rotary drilling
- hole
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- guide wall
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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
-
- 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
- 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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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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)
Abstract
The invention relates to a construction method for constructing an occlusive pile by using a lengthened pile casing of a rotary drilling rig, which comprises the following construction steps: (1) and (3) drilling holes in the guide wall: a hole is formed in the guide wall by a rotary drilling rig; hanging a protective cylinder in a hole formed in the guide wall and pressing down or vibrating and sinking the protective cylinder; after the rotary drilling rig conducts rotary drilling and soil taking in the protective cylinder, the protective cylinder is lengthened and pressed down or sunk, and then rotary drilling and soil taking are conducted again; (2) pouring concrete: and (2) adopting the step of (1) drilling in the guide wall to obtain an A plain pile hole required by the occlusive pile, directly pouring concrete after checking and accepting the A plain pile hole, and then removing the pile casing once or for multiple times. Adopting the step of (1) perforating in a guide wall to obtain a B meat pile hole required by the secant pile, and performing reinforcement cage installation and conduit installation after checking and accepting the B meat pile hole and then pouring concrete; then the catheter is pulled out and the sheath is pulled out once or more times. The invention can effectively prevent the hole wall from collapsing in the process of constructing the secant pile by the rotary drilling rig, and avoids the excessive use of concrete.
Description
Technical Field
The invention relates to the technical field of construction methods of foundation pit enclosure secant piles.
Background
At present, the construction method is commonly used in the construction of foundation pit enclosure secant piles of buildings, municipal works and other construction projects, and the construction method comprises a rotary digging drilling machine construction method, a full casing pipe twisting machine grab bucket construction method and a full casing pipe full rotary drilling machine construction method. The construction method of the rotary drilling rig is widely used due to the advantages of high construction speed, low manufacturing cost, capability of entering rocks, capability of performing hard occlusion construction and the like, but also has the defects of poor perpendicularity of pile holes, easiness in collapse of the holes, leakage of a building enclosure and excessive concrete. Therefore, a construction method for constructing the secant pile by using the lengthened pile casing of the rotary drilling rig needs to be researched.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the construction method for constructing the secant pile by using the lengthened pile casing of the rotary drilling rig can effectively prevent the hole wall of the rotary drilling rig from collapsing in the secant pile construction process.
1. The technical scheme adopted by the invention for solving the technical problems is as follows: a construction method for constructing an occlusive pile by using a lengthened pile casing of a rotary drilling rig comprises the following construction steps:
(1) and (3) conducting wall construction: measuring and lofting, leveling a field, constructing a reinforced concrete guide wall, reserving a reserved hole of an occlusive pile on the guide wall, wherein the diameter of the reserved hole is 30-60 mm larger than that of a designed pile;
(2) and (3) drilling holes in the guide wall: forming a hole in the guide wall by a rotary drilling rig after the construction of the guide wall required by the field; the diameter of the hole in the guide wall is 30-60 mm larger than the diameter of the designed pile;
hanging a protective cylinder in a hole formed in the guide wall and pressing down or vibrating and sinking the protective cylinder; the diameter of the outer part of the pile casing is 20-40 mm larger than the diameter of the designed pile; the wall thickness of the protective cylinder is 15-20 mm;
after the rotary drilling rig conducts rotary drilling and soil taking in the protective barrel, the protective barrel is lengthened and pressed down or sunk and then the rotary drilling and soil taking are conducted again;
the rotary drilling rig lengthens the pile casing for multiple times, presses down or shakes and sinks the pile casing, and conducts rotary drilling and soil taking for multiple times until the pile casing reaches the pile bottom of the designed pile;
(3) pouring concrete: and (2) drilling a hole in the guide wall to obtain an A plain pile hole required by the occlusive pile, directly pouring concrete after the A plain pile hole is checked and accepted, and then removing the pile casing once or for multiple times.
Adopting (2) a step of opening a hole in the guide wall to obtain a B meat pile hole required by the secant pile, and performing reinforcement cage installation and conduit installation after the B meat pile hole is checked and accepted, and then pouring concrete; then the catheter is pulled out and the protective sleeve is pulled out once or for multiple times.
Preferably, the length of each pile casing is 3m or 6m, and when the length of the pile casing is within 6m, the pile casing can be pulled out once after the concrete is poured; when the length of the casing is more than 6m, the casing is pulled out for multiple times in a segmented mode in the pouring process.
Preferably, the drill rod of the rotary drilling rig is a short drill rod, and the height of the bottom of the drill bit from the ground is 3.0-4.0 m during construction.
The invention has the beneficial effects that: the construction method for constructing the secant pile by using the lengthened pile casing of the rotary drilling rig can effectively prevent the hole wall of the rotary drilling rig from collapsing in the construction process of the secant pile, avoids excessive concrete use, and is particularly suitable for the construction of the hard secant pile which is filled with soil on the upper layer and needs to enter rock or has underground obstacles and needs to be removed by the rotary drilling rig.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a construction flow chart of a construction method of constructing an occlusive pile by lengthening a pile casing of a rotary drilling rig;
FIG. 2 is a schematic plan view of a bite pile construction;
FIG. 3 is a schematic elevation view of a bite pile construction;
the method comprises the following steps of 1, a guide wall 2, a preformed hole 3, an occlusive pile to be constructed 4 and a pile casing.
Detailed Description
The invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
1. As shown in fig. 1, a construction method for constructing an occlusive pile by using a lengthened pile casing of a rotary drilling rig comprises the following construction steps:
(1) and (3) conducting wall construction: measuring and lofting, leveling a field, constructing a reinforced concrete guide wall 1, reserving a reserved hole 2 of an occlusive pile on the guide wall 1, wherein the diameter of the reserved hole 2 is 30-60 mm larger than that of a designed pile;
(2) and (3) drilling holes in the guide wall: forming a hole in the guide wall by a rotary drilling rig after the construction of the guide wall required by the field; the diameter of the hole in the guide wall is 30-60 mm larger than the diameter of the designed pile;
hanging a protective cylinder in a hole formed in the guide wall and pressing down or vibrating and sinking the protective cylinder; the diameter of the outer part of the pile casing is 20-40 mm larger than the diameter of the designed pile; the wall thickness of the protective cylinder is 15-20 mm;
after the rotary drilling rig conducts rotary drilling and soil taking in the protective barrel, the protective barrel is lengthened and pressed down or sunk and then the rotary drilling and soil taking are conducted again;
the rotary drilling rig lengthens the pile casing for multiple times, presses down or shakes and sinks the pile casing, and conducts rotary drilling and soil taking for multiple times until the pile casing reaches the pile bottom of the designed pile;
(3) pouring concrete: and (2) performing hole opening step in the guide wall to obtain a plain pile hole A required by the secant pile, directly pouring concrete after checking and accepting the plain pile hole A, and then pulling out the pile casing once or for multiple times.
Adopting (2) a step of opening a hole in the guide wall to obtain a B meat pile hole required by the secant pile, and performing reinforcement cage installation and conduit installation after the B meat pile hole is checked and accepted, and then pouring concrete; then the catheter is pulled out and the protective sleeve is pulled out once or for multiple times.
The length of each pile casing is 3m or 6m, and when the length of the pile casing is within 6m, the pile casing can be pulled out once after the concrete is poured; when the length of the casing is more than 6m, the casing is pulled out for multiple times in a segmented mode in the pouring process. The drill rod of the rotary drilling rig is a short drill rod, and the height between the bottom of the drill bit and the ground is 3.0-4.0 m during construction.
As shown in a plan view of the construction of the occlusive pile shown in fig. 2 and a vertical view of the construction of the occlusive pile shown in fig. 3, the occlusive pile construction of a vegetable pile A and a meat pile B needs to be carried out on the guide wall 1, and a steel casing 4 is added in the construction.
The invention provides a construction method for constructing an occlusive pile by lengthening a pile casing of a rotary drilling rig, which can effectively prevent a hole wall of the rotary drilling rig from collapsing in the process of constructing the occlusive pile, avoids excessive concrete use, and is particularly suitable for the construction of a hard occlusive pile constructed by a rotary drilling process in which soil is filled in an upper layer and rock entering is needed or underground obstacles need to be cleared by the rotary drilling rig. The construction method for constructing the secant pile by using the lengthened pile casing of the rotary drilling rig can effectively prevent the hole wall from collapsing and prevent the guide wall from displacing and sinking in the construction process. The plain pile concrete for pouring the plain pile hole A can adopt non-delayed coagulation concrete, thereby saving the construction cost, reducing the consumption of slurry and the discharge of the slurry, and belonging to a practical, advanced and environment-friendly construction process.
The process flow chart is shown in fig. 3, before the guide wall construction, the measurement lofting and the field leveling are performed according to the conventional method, the slurry circulation is performed according to the conventional method when the rotary drilling rig opens the hole, and the slurry preparation and the slurry treatment are performed according to the conventional method. The casing has been processed in advance. And the reinforcement cage is manufactured and accepted in advance, the guide pipe is checked and tested conventionally, and the concrete is supplied and checked before the pouring concrete is lifted.
The technical requirements are as follows: 1. during the construction of the guide wall, the diameter of a preformed hole of the guide wall is required to be 30-60 mm larger than the diameter of a designed pile, so that the lower pile casing and drilling excavation are facilitated. 2. The outer diameter of the pile casing is preferably larger than the designed pile diameter by 20-40 mm, the wall thickness is preferably 15-20 mm, the length is preferably 3m or 6m per section, the total length of the pile casing is preferably 1-2m through a fill layer or a poor stratum, the pile casing can be lengthened according to the drilling requirement, generally, 3-9 m is below a vegetable pile casing A, 3-6 m is below a meat pile casing B, and the construction difficulty is too large when the pile casing is too long. 3. The drill rod of the rotary drilling rig uses a short drill rod, and the height from the bottom of the drill bit to the ground is 3.0-4.0 m during construction. 4. When the pile casing is hoisted and pressed down or vibrated and sunk by using a vibration hammer, the verticality of the pile casing is required to be less than 0.3 percent, and the pile casing can be hoisted, rotationally drilled and drilled by a crane (an automobile crane or a crawler crane) and positioned and sunk by an excavator in a matching way. If the protective cylinder has larger inclination, the protective cylinder should be pulled out and replaced after necessary measures are taken. 5. When the A plain pile is constructed, a reinforcement cage is not needed to be installed, and the pile concrete can be directly poured after the drilling and acceptance check. 6. After concrete is poured, the protective cylinder can be pulled out once or for multiple times according to actual conditions, according to field construction experience, when the length of the protective cylinder is within 6m, the protective cylinder can be pulled out once after concrete pouring is finished, and when the length of the protective cylinder is more than 6m, the protective cylinder is pulled out in sections in the pouring process.
The lengthened protective barrel of the guide wall internal rotation excavator is adopted to construct and enclose the secant pile, so that the problems of hole collapse and overlarge inclination in the drilling process of the filled soil layer and other unfavorable stratums are solved, the construction quality of the secant pile is improved, and the cost is reduced. In the engineering construction process of the enclosure secant pile of the main body of a railway station, the number of the secant piles is about 800, the surface layer is mostly backfilled soil, the excavation depth of a foundation pit is 17m, the length of the enclosure pile is about 19-23 m, the weathering rock in the middle is 2-13 m, a 3-6 m long pile casing and rotary excavating hard secant construction method is adopted, the engineering construction is smoothly carried out, the filling coefficient of concrete is within 1.1, no collapse hole, no guide wall displacement and collapse phenomenon exist, no water leakage phenomenon exists after the foundation pit is excavated, and good benefits are obtained.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. A construction method for constructing an occlusive pile by lengthening a pile casing of a rotary drilling rig is characterized by comprising the following steps: the method comprises the following construction steps:
(1) and (3) conducting wall construction: measuring and lofting, leveling a field, constructing a reinforced concrete guide wall, reserving a reserved hole of an occlusive pile on the guide wall, wherein the diameter of the reserved hole is 30-60 mm larger than that of a designed pile;
(2) and (3) drilling holes in the guide wall: forming a hole in the guide wall by a rotary drilling rig after the construction of the guide wall required by the field; the diameter of the hole in the guide wall is 30-60 mm larger than the diameter of the designed pile;
hanging a protective cylinder in a hole formed in the guide wall and pressing down or vibrating and sinking the protective cylinder; the diameter of the outer part of the pile casing is 20-40 mm larger than the diameter of the designed pile; the wall thickness of the protective cylinder is 15-20 mm;
after the rotary drilling rig conducts rotary drilling and soil taking in the protective barrel, the protective barrel is lengthened and pressed down or sunk and then the rotary drilling and soil taking are conducted again;
the rotary drilling rig lengthens the pile casing for multiple times, presses down or shakes and sinks the pile casing, and conducts rotary drilling and soil taking for multiple times until the pile casing reaches the pile bottom of the designed pile;
(3) pouring concrete: and (2) drilling a hole in the guide wall to obtain an A plain pile hole required by the occlusive pile, directly pouring concrete after the A plain pile hole is checked and accepted, and then removing the pile casing once or for multiple times.
Adopting (2) a step of opening a hole in the guide wall to obtain a B meat pile hole required by the secant pile, and performing reinforcement cage installation and conduit installation after the B meat pile hole is checked and accepted, and then pouring concrete; then the catheter is pulled out and the protective sleeve is pulled out once or for multiple times.
2. The construction method for constructing the secant pile by lengthening the casing of the rotary drilling rig according to claim 1, which is characterized in that: the length of each pile casing is 3m or 6m, and when the length of the pile casing is within 6m, the pile casing can be pulled out once after the concrete is poured; when the length of the casing is more than 6m, the casing is pulled out for multiple times in a segmented mode in the pouring process.
3. The construction method for constructing the secant pile by lengthening the casing of the rotary drilling rig according to claim 1, which is characterized in that: the drill rod of the rotary drilling rig is a short drill rod, and the height from the bottom of the drill bit to the ground is 3.0-4.0 m during construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010059115.3A CN111236214A (en) | 2020-01-18 | 2020-01-18 | Construction method for constructing secant pile by lengthening protective cylinder of rotary drilling rig |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010059115.3A CN111236214A (en) | 2020-01-18 | 2020-01-18 | Construction method for constructing secant pile by lengthening protective cylinder of rotary drilling rig |
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| CN111236214A true CN111236214A (en) | 2020-06-05 |
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| CN202010059115.3A Pending CN111236214A (en) | 2020-01-18 | 2020-01-18 | Construction method for constructing secant pile by lengthening protective cylinder of rotary drilling rig |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356189A (en) * | 2021-06-21 | 2021-09-07 | 中铁十二局集团有限公司 | Full-sleeve hole forming construction method for rotary drilling rig |
| CN113718798A (en) * | 2021-10-09 | 2021-11-30 | 中建八局第二建设有限公司 | Construction method for layered construction pore-forming of rock-socketed secant pile in riprap region near sea |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356189A (en) * | 2021-06-21 | 2021-09-07 | 中铁十二局集团有限公司 | Full-sleeve hole forming construction method for rotary drilling rig |
| CN113718798A (en) * | 2021-10-09 | 2021-11-30 | 中建八局第二建设有限公司 | Construction method for layered construction pore-forming of rock-socketed secant pile in riprap region near sea |
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Application publication date: 20200605 |