CN111962504A - Construction method for covering and digging top-down permanent steel pipe column - Google Patents
Construction method for covering and digging top-down permanent steel pipe column Download PDFInfo
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- CN111962504A CN111962504A CN202010716852.6A CN202010716852A CN111962504A CN 111962504 A CN111962504 A CN 111962504A CN 202010716852 A CN202010716852 A CN 202010716852A CN 111962504 A CN111962504 A CN 111962504A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 186
- 239000010959 steel Substances 0.000 title claims abstract description 186
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 238000005553 drilling Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000009434 installation Methods 0.000 claims abstract description 18
- 230000002787 reinforcement Effects 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a construction method for covering and excavating a top-down permanent steel pipe column, which comprises the following steps: s1, pile position centering, steel sleeve installation, drilling by a drilling machine: a full-casing full-slewing drilling machine is adopted to rotationally press a steel sleeve in a pile position, and drilling operation is carried out simultaneously, so that the steel sleeve leads the drilling depth, and the perpendicularity of the steel sleeve and the perpendicularity of a formed hole are detected; s2, installing a reinforcement cage, and pouring pile foundation concrete; s3, installing the steel pipe column and checking the verticality of the steel pipe column: the method comprises the steps of installing a vertical sensor on a steel pipe column, placing the steel pipe column into a full-casing full-slewing drilling machine for hoisting, installing a plurality of hydraulic jacks on the outer wall of the steel pipe column, and controlling the hydraulic jacks to adjust the position of the steel pipe column according to the reading of the vertical sensor. The construction method of the cover-excavation reverse-construction permanent steel pipe column can monitor the hole-forming verticality and the steel pipe column verticality and correct the deviation in time, thereby ensuring the installation precision and the verticality of the steel pipe column and ensuring the engineering quality and the safety performance of the cover-excavation reverse-construction structure.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a construction method for a cover-excavation reverse construction permanent steel pipe column.
Background
With the vigorous development of rail transit construction, the demand of subway stations in densely-built areas is more and more strong, the ground traffic can be blocked when the subway stations in the central area of the city are constructed by adopting an open excavation method, the construction floor area can be reduced to the maximum extent by a cover excavation reverse method without interrupting the traffic, and the influence of subway construction on the urban traffic operation and the life of residents is greatly reduced, so that the subway construction method is widely applied in recent years. The cover-excavation reverse method is that after the ground is excavated downwards to a certain depth, the top is sealed, and the rest lower engineering works are constructed under the sealed top plate, namely, the main structure is excavated layer by layer from top to bottom and is built to the bottom plate.
In the cover-excavation reverse construction method, the steel pipe column is used as a main stressed structural member of the cover-excavation structure, can bear vertical load in a construction stage and a use stage, and has quite high requirements on installation accuracy and verticality control of the steel pipe column. Meanwhile, the mounting precision and the verticality of the steel pipe column in the construction process directly influence the bearing performance and the safety performance of the steel pipe column in the subsequent construction and use stages. Therefore, ensuring smooth installation and accurate positioning of the steel pipe column is a technical difficulty in construction and is also a technical key point.
In the prior art, the positioning construction of the steel pipe column mostly adopts an HPE hydraulic vertical method, and a permanent steel pipe column with a closed bottom end is vertically inserted into supporting pile concrete after the supporting pile concrete is poured and before the concrete is initially set by vertically inserting HPE liquid into two hydraulic vertical insertion devices on a machine body until the permanent steel pipe column is inserted to a designed elevation. However, the HPE hydraulic vertical method cannot guarantee positioning accuracy after exceeding a certain depth.
At present, no complete, mature and safe construction method exists for the installation and positioning of the large-diameter steel pipe column in the large-scale comprehensive transportation hub project.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects of the prior art and provide the construction method of the cover-excavation reverse-construction permanent steel pipe column, which can monitor the hole-forming verticality and the steel pipe column verticality and correct the deviation in time, thereby ensuring the installation precision and the verticality of the steel pipe column and ensuring the engineering quality and the safety performance of the cover-excavation reverse-construction structure.
The invention is realized based on the following inventive concept: a construction method for covering and digging a top-down permanent steel pipe column comprises the following steps:
s1, pile position centering, steel sleeve installation, drilling by a drilling machine: a full-casing full-slewing drilling machine is adopted to rotationally press a steel sleeve in a pile position, and drilling operation is carried out simultaneously, so that the steel sleeve leads the drilling depth, and the perpendicularity of the steel sleeve and the perpendicularity of a formed hole are detected;
s2, installing a reinforcement cage, and pouring pile foundation concrete;
s3, installing the steel pipe column and checking the verticality of the steel pipe column: the method comprises the steps of installing a vertical sensor on a steel pipe column, placing the steel pipe column into a full-casing full-slewing drilling machine for hoisting, installing a plurality of hydraulic jacks on the outer wall of the steel pipe column, and controlling the hydraulic jacks to adjust the position of the steel pipe column according to the reading of the vertical sensor.
Compared with the prior art, the invention provides a construction method of a covering and digging top-down permanent steel pipe column, which adopts a full-casing full-slewing drilling machine to form a hole when constructing a pile foundation, simultaneously detects the perpendicularity of the formed hole, corrects the deviation in time, ensures that the perpendicularity of the formed hole meets the high-precision design requirement, and also lays a foundation for the installation precision of the steel pipe column; meanwhile, when the steel pipe column is installed, the verticality condition of the steel pipe column is detected in real time by using the vertical sensor, automatic deviation rectification is realized by using the hydraulic jack, and the verticality of the steel pipe column is ensured to meet the design requirement. According to the invention, through the common regulation and control of the hole forming verticality and the vertical reading of the steel pipe column, the accurate positioning of the steel pipe column is realized, and further the engineering quality and the safety performance of the cover-excavation reverse construction structure are ensured.
Further, in step S3, the vertical sensors are respectively installed at the top and the bottom of the steel pipe column, the vertical sensors are tilt sensors, and the tilt sensors are in a horizontal state during installation, and the X/Y axis values of the wireless receiving display of the tilt sensors are reset to zero. According to the invention, the inclination angle sensors are arranged at the top and the bottom of the steel pipe column, whether the steel pipe column is vertical or not can be judged by measuring the inclination of the top surface and the bottom surface of the steel pipe column relative to the horizontal position, and the offset can be judged according to the reading of the X/Y axis of the inclination angle sensors, so that the deviation can be corrected in time.
Further, in step S3, before the steel pipe column is installed, slurry is pumped out of the hole to reduce buoyancy, and when the steel pipe column is installed, a solution is injected into the steel pipe column to increase gravity. After the dead weight of the steel pipe column and the buoyancy and the friction force in the installation process are calculated and compared, when the buoyancy and the friction force are larger than the dead weight of the steel pipe column, a construction method of pumping and discharging the slurry in the hole before the steel pipe column hole and injecting water into the steel pipe column in the installation process is adopted, the gravity of the water in the steel pipe column and the steel pipe column is larger than the buoyancy, and smooth installation of the steel pipe column is further ensured.
Further, the hydraulic jacks are specifically four, and are arranged at equal intervals along the circumferential direction of the steel pipe column. The offset of the steel pipe column can be judged according to the reading of the vertical sensor, and then four hydraulic jacks are controlled to correct the deviation of the steel pipe column in different directions.
Further, a chain rope is arranged on the hydraulic jack. The chain rope is installed on the hydraulic jack to realize later-stage dismantling and achieve the aim of recycling.
Further, in step S1, the method specifically includes: a full-casing full-slewing drilling machine is adopted to drive a steel casing to be rotationally pressed into a formed hole, and drilling is carried out simultaneously, so that the depth of the steel casing ahead of the drilled hole is 3 m; in the process, the full-casing full-slewing drilling machine stops pressing the steel casing pipe when drilling for 10-15m, detects the hole forming verticality by using an ultrasonic drilling detector, and corrects the verticality of the steel casing pipe by using a total station. The method for pressing the steel sleeve while drilling is adopted, and the hole forming verticality is detected in real time, so that the hole forming verticality and the verticality of the steel sleeve can meet the design requirements.
Furthermore, the perpendicularity of the formed hole is not more than three thousandths, and the depth of the steel pipe sleeve is 3m ahead of the depth of the formed hole.
Further, in step S2, the cast pile foundation concrete is super-retarding concrete, and the slump when the concrete is poured is 18cm-22 cm.
Further, in step S2, when installing the reinforcement cage, the reinforcement cage is welded to the steel sleeve by using the spacer bar. The positioning steel bars can prevent the steel reinforcement cage from floating upwards.
Further, after the step S3, the method further includes (1) pouring concrete into the steel pipe column, (2) removing the hydraulic jack and the vertical sensor, (3) removing the steel casing (4), and backfilling coarse sand outside the steel pipe column.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a construction method for covering and excavating a top-down permanent steel pipe column according to an embodiment of the present invention;
FIG. 2 is a structural view of a construction apparatus for capping and excavating a top-down permanent steel pipe column according to an embodiment of the present invention;
fig. 3 is an installation structure view of the hydraulic jack according to the embodiment of the present invention.
Detailed Description
A construction method of a covered-excavated reversed permanent steel pipe column, referring to fig. 1, comprising the following steps:
s1, pile position centering, steel sleeve installation, drilling by a drilling machine: a full-casing full-slewing drilling machine is adopted to rotationally press a steel sleeve in a pile position, and drilling operation is carried out simultaneously, so that the steel sleeve leads the drilling depth, and the perpendicularity of the steel sleeve and the perpendicularity of a formed hole are detected;
before installing the steel casing, the construction site is leveled, a total station is adopted to discharge a pile position central line and a positioning pile, then the control pile is led out, in the embodiment, the control pile is made of phi 12 steel bars and is driven into the ground for at least 30cm, the pile position and the pile position center are checked repeatedly, the base of the full-casing full-slewing drilling machine is hoisted after the control pile is confirmed to be correct, the reserved hole of the base is aligned to the pile position center, and the steel casing is installed.
When the steel sleeve is installed, a full-sleeve full-slewing drilling machine is adopted to drive the steel sleeve to rotate for 360 degrees and press down, and the steel sleeve is pressed into a formed hole while slewing, so that the steel sleeve is always ensured to advance 3-5m in comparison with the drilling depth in the process of digging and grabbing soil by a rotary drilling machine; in the process, the full-casing full-slewing drilling machine stops pressing the steel casing pipe when drilling for 10-15m, detects the hole forming verticality by using an ultrasonic drilling detector, and corrects the verticality of the steel casing pipe by using a total station instrument, wherein the hole forming verticality is not more than three thousandths of a hole. The installation depth of the steel sleeve is controlled to be 3m above the pile top of the pile foundation, so that the steel sleeve is prevented from being embedded into the pile foundation concrete to cause difficulty in dismantling and pulling. After the hole forming depth is below the steel sleeve, adding the prepared qualified slurry, continuing drilling the drilled pile with the diameter of 2.5m, and adding the stabilizing liquid while drilling to keep the liquid level in the hole at a certain height so as to increase the pressure and ensure the quality of the steel sleeve.
S2, installing a reinforcement cage, and pouring pile foundation concrete;
after the steel sleeve is installed, the steel sleeve is subjected to hole cleaning treatment, concrete pouring is immediately performed on a pile foundation, the concrete is super-delayed coagulation concrete, the slump during concrete pouring is 18cm-22cm, the concrete initial setting time needs to be considered, the concrete pouring completion time and the steel pipe column insertion operation time need to be considered, and in the embodiment, the concrete initial setting time is 30 hours. And hoisting the steel reinforcement cage, and welding the steel reinforcement cage on the inner wall of the steel sleeve by adopting 2 positioning steel bar weldings.
S3, installing the steel pipe column and checking the verticality of the steel pipe column: the method comprises the steps of installing a vertical sensor on a steel pipe column, placing the steel pipe column into a full-casing full-slewing drilling machine for hoisting, installing a plurality of hydraulic jacks on the outer wall of the steel pipe column, and controlling the hydraulic jacks to adjust the position of the steel pipe column according to the reading of the vertical sensor.
Specifically, referring to fig. 2, before installing the steel pipe column 30, the method further includes a step of centering the full-casing full-slewing drilling machine 10, i.e., a technician releases the center of the pile position again, marks crosshairs on the steel casing 20, and runs and sets the fender piles in four directions, rechecks the center 10 of the full-casing full slewing drilling machine to be consistent with the center of the pile position, and rechecks to ensure that the drilling machine is horizontal and stable. After the centering of the full-casing full-rotary drilling machine 10 is completed, the levelness can be manually and automatically adjusted, the adjustment is mainly carried out through a horizontal adjusting oil cylinder, a laser level meter is used for auxiliary inspection, the verticality is rechecked after the adjustment is completed, the central position is rechecked, and the hoisting and entering hole work of the steel pipe column is carried out after the requirements are met. In addition, the vertical sensors 40 are installed on the top and the bottom of the steel pipe column 30, in this embodiment, the vertical sensors 40 are tilt sensors, the tilt sensors must be installed in a horizontal state, and the X/Y axis numbers of the wireless receiving display of the tilt sensors are reset to zero. Further, still include at steel pipe column top installation tool post, because steel pipe column design capital elevation lies in the scope of 0 ~ 10m below the former ground, the effect of tool post is exactly supplementary steel pipe column installation to design roof elevation, and the built-in steel cat ladder of tool post makes things convenient for the staff to get into the steel pipe column in, removes to the roof position after, dismantles the junction with the following steel pipe column of roof, accomplishes the elevation of steel pipe column capital. In this embodiment, the diameter of the tool post is Φ 2100m, the wall thickness is 20mm, the tool post is combined with the top of the steel pipe post, and the tool post is 2.5-4 m higher than the ground plane.
When installing the steel-pipe column, at first calculate the dead weight of steel-pipe column and buoyancy and frictional force in the installation, and compare the two, the buoyancy and the frictional resistance of steel-pipe column are greater than the dead weight of steel-pipe column in this embodiment, therefore, carry out the pump drainage to downthehole mud before steel-pipe column hoist and mount hand-hole in this embodiment, begin the hoist and mount after the pump drainage is accomplished and transfer the steel-pipe column, the steel-pipe column is transferred the in-process and is poured water into the steel-pipe column, ensure that the gravity sum of water is greater than buoyancy, frictional force sum in steel-pipe column and the steel-pipe. Referring to fig. 3, after the steel pipe 30 is lowered to a set position, 4 hydraulic jacks 50 are installed on the outer wall of the steel pipe column 30, and one end of each hydraulic jack 50 is installed on the inner wall of the steel casing 20, and the other end abuts against the outer wall of the steel pipe column 30. In this embodiment, the four hydraulic jacks 50 are equally spaced along the circumferential direction of the steel pipe column 30, and the hydraulic jacks 50 are installed at positions close to the bottom of the steel pipe column 30 but higher than the elevation of the top surface of the pile foundation concrete, so that the steel pipe column is adjusted to be vertical by adjusting the four jacks. Furthermore, the hydraulic jack is provided with a steel wire rope or an iron chain and other chain ropes, so that the hydraulic jack can be conveniently taken out of the hole when being subsequently dismantled.
When the verticality of the steel pipe column is detected and adjusted, the inclination angle sensor automatically detects the verticality of the steel pipe column, data are transmitted to the wireless receiving display, the stroke of four jacks mounted on the steel pipe column is automatically adjusted according to the data on the wireless receiving display to correct the deviation, when the data reading of an X/Y axis in the wireless receiving display is zero, the steel pipe column is vertical, and the verticality check of the steel pipe column is successful.
S4, pouring concrete into the steel pipe column;
and after the strength of the concrete of the pile foundation reaches more than 70% of the designed strength, pouring the concrete into the steel pipe column, and pouring by adopting C60 self-closed chamber micro-expansion concrete and a conduit method. After the tool column, the vertical sensor and the hydraulic jack are dismantled, concrete pouring in the permanent steel pipe column is carried out, the guide pipe is firstly put down to carry out concrete pouring in the permanent steel pipe column, the concrete compactness under a flange plate in the permanent steel pipe column needs to be paid particular attention to during pouring, when the flange part is poured, the guide pipe needs to be pulled up and down to enable the concrete to fully fill a gap at the bottom of the flange, pouring is stopped after the permanent steel pipe column is poured, and a period of time is observed, if the concrete sinks from the compactness, the concrete needs to be refilled to the column top.
S5, dismantling the steel sleeve, and backfilling medium coarse sand;
and removing the steel sleeve, after the concrete pouring in the steel pipe column is finished and reaches 70% of the design strength, backfilling coarse sand between the cast-in-situ bored pile and the steel pipe column, adding water for compacting, backfilling the coarse sand to the position 2m below the original ground, and tamping the residual backfilled clay 2 m.
Compared with the prior art, the invention provides a construction method of a covering and digging top-down permanent steel pipe column, which adopts a full-casing full-slewing drilling machine to form a hole when constructing a pile foundation, simultaneously detects the perpendicularity of the formed hole, corrects the deviation in time, ensures that the perpendicularity of the formed hole meets the high-precision design requirement, and also lays a foundation for the installation precision of the steel pipe column; meanwhile, when the steel pipe column is installed, the verticality condition of the steel pipe column is detected in real time by using the vertical sensor, automatic deviation rectification is realized by using the hydraulic jack, and the verticality of the steel pipe column is ensured to meet the design requirement. According to the invention, through the common regulation and control of the hole forming verticality and the vertical reading of the steel pipe column, the accurate positioning of the steel pipe column is realized, and further the engineering quality and the safety performance of the cover-excavation reverse construction structure are ensured.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (10)
1. A construction method for covering and digging a top-down permanent steel pipe column is characterized by comprising the following steps: the method comprises the following steps:
s1, pile position centering, steel sleeve installation, drilling by a drilling machine: a full-casing full-slewing drilling machine is adopted to rotationally press a steel sleeve in a pile position, and drilling operation is carried out simultaneously, so that the steel sleeve leads the drilling depth, and the perpendicularity of the steel sleeve and the perpendicularity of a formed hole are detected;
s2, installing a reinforcement cage, and pouring pile foundation concrete;
s3, installing the steel pipe column and checking the verticality of the steel pipe column: the method comprises the steps of installing a vertical sensor on a steel pipe column, placing the steel pipe column into a full-casing full-slewing drilling machine for hoisting, installing a plurality of hydraulic jacks on the outer wall of the steel pipe column, and controlling the hydraulic jacks to adjust the position of the steel pipe column according to the reading of the vertical sensor.
2. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 1, characterized in that: in step S3, the vertical sensors are respectively installed at the top and bottom of the steel pipe column, the vertical sensors are tilt sensors, and when the vertical sensors are installed, the tilt sensors are in a horizontal state, and the X/Y axis values of the wireless receiving display of the tilt sensors are reset to zero.
3. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 2, characterized in that: in step S3, before the steel pipe column is installed, slurry is pumped out of the hole to reduce buoyancy, and when the steel pipe column is installed, a solution is injected into the steel pipe column to increase gravity.
4. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 3, characterized in that: the number of the hydraulic jacks is four, and the hydraulic jacks are arranged at equal intervals along the circumferential direction of the steel pipe column.
5. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 4, characterized in that: the hydraulic jack is provided with a chain rope.
6. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 1, characterized in that: in step S1, the method specifically includes: a full-casing full-slewing drilling machine is adopted to drive a steel casing to be rotationally pressed into a formed hole, and drilling is carried out simultaneously, so that the depth of the steel casing ahead of the drilled hole is 3 m; in the process, the full-casing full-slewing drilling machine stops pressing the steel casing pipe when drilling for 10-15m, detects the hole forming verticality by using an ultrasonic drilling detector, and corrects the verticality of the steel casing pipe by using a total station.
7. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 6, characterized in that: the perpendicularity of the formed hole is not more than three thousandths, and the depth of the steel pipe sleeve is 3m ahead of that of the formed hole.
8. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 1, characterized in that: in step S2, the cast pile foundation concrete is super-retarding concrete, and the slump constant of the concrete during pouring is 18cm-22 cm.
9. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 8, characterized in that: in step S2, when the reinforcement cage is installed, the reinforcement cage is welded to the steel sleeve by using the spacer bar.
10. The construction method of the covered-excavated reversed permanent steel pipe column according to claim 1, characterized in that: and (S3) pouring concrete into the steel pipe column, (2) removing the hydraulic jack and the vertical sensor, (3) removing the steel sleeve (4), and backfilling coarse sand outside the steel pipe column.
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| CN202010716852.6A CN111962504A (en) | 2020-07-23 | 2020-07-23 | Construction method for covering and digging top-down permanent steel pipe column |
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| CN202010716852.6A CN111962504A (en) | 2020-07-23 | 2020-07-23 | Construction method for covering and digging top-down permanent steel pipe column |
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Cited By (10)
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| CN112814277A (en) * | 2020-12-31 | 2021-05-18 | 开普天（上海）岩土科技有限公司 | Upright post construction method in one-post one-pile construction |
| CN112832458A (en) * | 2020-12-31 | 2021-05-25 | 开普天（上海）岩土科技有限公司 | Upright post construction method in one-post one-pile construction |
| CN112900450A (en) * | 2021-01-20 | 2021-06-04 | 深圳市工勘岩土集团有限公司 | Rotary drilling and full-rotation combined back-inserting method positioning method for steel pipe structure pile by reverse construction method |
| CN112983276A (en) * | 2021-03-19 | 2021-06-18 | 中建四局第一建筑工程有限公司 | Deviation rectifying device based on large-diameter overlong pile hole forming drilling machine, drilling machine and deviation rectifying method |
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| CN115324105A (en) * | 2022-08-11 | 2022-11-11 | 中铁十一局集团第一工程有限公司 | Permanent steel pipe column positioning and verticality adjusting device for cover-excavation top-down construction method and construction method |
| CN117926866A (en) * | 2024-03-21 | 2024-04-26 | 凯屹建设(山西)有限公司 | Method for manufacturing cast-in-place pile deviation correction under building foundation by adopting horizontal reaming |
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| CN112983276B (en) * | 2021-03-19 | 2023-08-29 | 中建四局第一建设有限公司 | Deviation correcting device based on large-diameter ultra-long pile hole forming drilling machine, drilling machine and deviation correcting method |
| CN112983276A (en) * | 2021-03-19 | 2021-06-18 | 中建四局第一建筑工程有限公司 | Deviation rectifying device based on large-diameter overlong pile hole forming drilling machine, drilling machine and deviation rectifying method |
| CN113293869A (en) * | 2021-04-21 | 2021-08-24 | 北京城建集团有限责任公司 | Construction method for rear insertion of steel upright post |
| CN113914310A (en) * | 2021-11-09 | 2022-01-11 | 粤水电轨道交通建设有限公司 | Bottom sealing type steel pipe column and uplift pile concrete continuous pouring method and structure |
| CN114541783A (en) * | 2022-03-09 | 2022-05-27 | 中建三局基础设施建设投资有限公司 | Accurate positioning device suitable for permanent-temporary combined steel pipe column and construction method |
| CN115324105A (en) * | 2022-08-11 | 2022-11-11 | 中铁十一局集团第一工程有限公司 | Permanent steel pipe column positioning and verticality adjusting device for cover-excavation top-down construction method and construction method |
| CN117926866A (en) * | 2024-03-21 | 2024-04-26 | 凯屹建设(山西)有限公司 | Method for manufacturing cast-in-place pile deviation correction under building foundation by adopting horizontal reaming |
| CN117926866B (en) * | 2024-03-21 | 2024-05-28 | 凯屹建设(山西)有限公司 | Method for manufacturing cast-in-place pile deviation correction under building foundation by adopting horizontal reaming |
| CN118390977A (en) * | 2024-06-26 | 2024-07-26 | 中铁广州工程局集团市政环保工程有限公司 | Pile foundation construction positioner |
| CN118390977B (en) * | 2024-06-26 | 2024-09-13 | 中铁广州工程局集团市政环保工程有限公司 | Pile foundation construction positioner |
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