CN117738172B - Pile foundation steel pile casing construction method under bare rock geological condition - Google Patents
Pile foundation steel pile casing construction method under bare rock geological condition Download PDFInfo
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- CN117738172B CN117738172B CN202410184855.8A CN202410184855A CN117738172B CN 117738172 B CN117738172 B CN 117738172B CN 202410184855 A CN202410184855 A CN 202410184855A CN 117738172 B CN117738172 B CN 117738172B
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- 238000010276 construction Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000000670 limiting effect Effects 0.000 claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 230000008093 supporting effect Effects 0.000 claims description 46
- 230000007246 mechanism Effects 0.000 claims description 13
- 210000001503 joint Anatomy 0.000 claims description 2
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- 239000007769 metal material Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 18
- 238000005553 drilling Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000003628 erosive effect Effects 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
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- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention belongs to the technical field of pile foundation steel casing construction methods, and particularly relates to a pile foundation steel casing construction method under bare rock geological conditions, wherein the method comprises the following steps of S1: calibrating the vertical projection range of the steel casing on the surface of the bare rock, and implanting a plurality of positioning steel bars into the bare rock around the edge of the projection range, so that the positioning steel bars form a positioning cage sleeved and fixed at the bottom end of the steel casing; s2: the top end of the steel pile casing is mounted on a construction platform in a limiting way through a guide frame, the position and the verticality of the steel pile casing are detected through a total station, the position and the verticality of the steel pile casing are adjusted through the guide frame according to the deviation value of measured data and standard data, and the steel pile casing is hoisted to enable the bottom end of the steel pile casing to be embedded into a positioning cage, so that the two ends of the steel pile casing are limited to prevent the deflection displacement of the steel pile casing; s3: the rotary digging machine descends along the steel pile casing from the construction platform, so that the rotary digging part digs and guides the bare rock by depending on the limit and the protection of the steel pile casing; the method can improve the installation accuracy of the steel casing under the geological condition of bare rock.
Description
Technical Field
The invention belongs to the technical field of pile foundation steel casing construction methods, and particularly relates to a pile foundation steel casing construction method under bare rock geological conditions.
Background
The pile foundation steel pile casing is generally used for protecting an orifice soil body in a construction process, preventing orifice collapse, ensuring safety of the orifice, positioning a drilling machine, helping the drilling machine to accurately work in an orifice, blocking external water flow into the orifice, helping to keep stability of water level in the orifice, controlling elevation of a pile top, ensuring that a pile body cannot deviate from a preset target in the drilling process, protecting the pile body from erosion of external forces such as pit wall collapse, sediment flushing, sand penetration and the like, and when bare rock geology is encountered in the construction process, the steel pile casing is used for pouring construction of the pile foundation as a pile foundation protection wall because the bare rock geology is generally underwater, and water flow intercommunication inside and outside the steel pile casing is isolated under water, so that poured concrete is prevented from flushing away under the action of the water flow, and other construction steps in the steel pile casing are protected, and therefore the steel pile casing needs to be placed at the bottom of a guiding hole when the underwater bare rock geology is constructed.
When the general construction method for the sand-stone river bed or the sea bottom is used for burying the steel pile casing on the uneven bare rock surface, the steel pile casing is installed in a vibrating mode by adopting a vibrating hammer, but the phenomenon of curling occurs when the bottom opening of the steel pile casing collides with the surface of the bare rock, the steel pile casing cannot be embedded into the rock surface, one side of the steel pile casing is supported by boulder or bare rock, the other side of the steel pile casing is suspended in the air, the steel pile casing cannot be accurately and stably placed, accurate guiding and positioning of a rotary excavator cannot be achieved, and the final drilling and steel pile casing installation have deviation or lower engineering quality, so that reworking is required and the construction period is prolonged.
In the prior art, in order to set a steel casing on bare rock, a guide hole is generally drilled on the bare rock through a rotary excavator and reaches a designed elevation position, and then the steel casing is placed in the guide hole, so that the drill bit cannot be guided through the stable placement of the steel casing on the surface of the bare rock due to the uneven surface of the bare rock, and only the construction position can be preliminarily determined, and then the construction operation is carried out on the surface of the bare rock through the rotary excavator without guidance, so that the construction efficiency and the construction precision are low.
In order to reduce the installation difficulty of the steel casing under the bare rock geological condition and improve the construction precision, the steel casing is required to be accurately positioned, so that the steel casing guides the rotary excavator, and therefore, the pile foundation steel casing construction method under the bare rock geological condition is provided.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a pile foundation steel casing construction method under bare rock geological conditions.
The aim of the invention can be achieved by the following technical scheme:
the invention discloses a pile foundation steel casing construction method under bare rock geological conditions, which comprises the following steps:
S1: calibrating the vertical projection range of the steel casing on the surface of the bare rock, and implanting a plurality of positioning steel bars into the bare rock around the edge of the projection range, so that the positioning steel bars form a positioning cage for fixedly sleeving the bottom end of the steel casing;
s2: the top end of the steel pile casing is mounted on the construction platform in a limiting manner through a guide frame, and the steel pile casing is hoisted to enable the bottom end of the steel pile casing to be embedded into the positioning cage, so that the two ends of the steel pile casing are limited to prevent deflection displacement of the steel pile casing;
s3: the rotary digging machine descends along the steel pile casing from the construction platform, so that the rotary digging part performs hole digging and guiding operation on bare rock by depending on the limit and protection of the steel pile casing.
In step S2, after positioning the two ends of the steel casing, the position and the verticality of the steel casing are detected by the total station, and the position and the verticality of the steel casing are adjusted by the guide frame according to the deviation value of the measured data and the standard data.
As a preferable technical scheme of the invention, the guide frame comprises an outer frame and a limiting mechanism, wherein the outer frame is fixedly arranged on a construction platform, one end of the limiting mechanism is fixed on the inner wall of the outer frame, and the other end of the limiting mechanism abuts against the side wall of the steel casing to limit.
As a preferable technical scheme of the invention, the limiting mechanism comprises a pushing component and a bearing component, wherein the pushing component is propped against the side wall of the steel casing through a pushing part, the bearing component is propped against the side wall of the steel casing through a supporting part, and the steel casing is longitudinally moved through controlling the pushing part and the supporting part.
In the step S3, the pushing portion and the supporting portion are controlled to reciprocate the steel casing longitudinally every time the rotary digging portion digs to a certain depth, so that the steel casing vibrates to follow the digging depth of the rotary digging portion.
In step S2, if the surface of the bare rock is uneven within the vertical projection range of the steel casing, the bottom end surface of the steel casing abuts against the highest point of the bare rock, and the deflection displacement of the bottom end of the steel casing is limited by the positioning cage, and guide steel bars are circumferentially arranged around the steel casing.
In step S3, when the depth of the hole of the rotary drilling part is greater than the maximum height difference of the surface irregularities of the bare rock, the guide bar is removed and the steel casing is moved down to follow the downward drilling depth of the rotary drilling part.
As a preferable technical scheme of the invention, the bearing assembly further comprises a bearing support rod and a first hydraulic rod, wherein one end of the bearing support rod and one end of the first hydraulic rod are connected to the inner side wall of the outer frame, and the other end of the first hydraulic rod is connected to the bearing support rod; the pushing component comprises a second hydraulic rod; the supporting part and the pushing part are respectively connected to the bearing support rod and the other end of the second hydraulic rod, the bearing components and the pushing components are four groups, the four groups of bearing components and the pushing components are respectively in circumferential array butt joint with the side wall of the steel protection barrel, and the position and the verticality of the steel protection barrel are adjusted through the first hydraulic rod and the second hydraulic rod.
The beneficial effects of the invention are as follows:
fixing the positioning steel bar on bare rock, placing the steel pile casing in a range surrounded by the positioning steel bar to form preliminary positioning of the steel pile casing, supporting the guiding steel bar obliquely upwards on the side wall of the bottom of the steel pile casing to form secondary positioning after detecting the position and verticality of the steel pile casing, positioning and adjusting the top of the steel pile casing by a guide frame bearing assembly and a pushing assembly, drilling a guide hole in the bottom bare rock within the limit range of the steel pile casing by a rotary excavator after the positioning of the steel pile casing is completed, gradually lowering the steel pile casing along with downward excavation of the rotary excavator, and improving construction precision by guiding the steel pile casing in the preliminary excavation construction process by the rotary excavator;
Through the improvement to the guide frame, the bearing component of the guide frame applies upward supporting force to the steel pile casing, and the pushing component applies reverse pushing force larger than the supporting force to the steel pile casing, so that the steel pile casing moves downwards, the upward supporting force of the bearing component is larger than the gravity of the steel pile casing after a set distance is reached, the pushing component stops applying force, and when the steel pile casing is required to move upwards, a part of supporting force is also provided, the pushing component provides upward pushing force, the guide frame has the functions of positioning and adjusting, and a part of crane has the functions of avoiding the crane from interfering the rotary excavator and the steel pile casing during the simultaneous working, and the working efficiency is improved.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a schematic view of the structure of a steel casing of the present invention placed on the surface of bare rock;
FIG. 2 is a schematic diagram of the structure of the rotary excavator for excavating pilot holes in bare rock;
FIG. 3 is a schematic side sectional view of the guide frame of the present invention;
Fig. 4 is a schematic top view of the guide frame of the present invention.
Reference numerals illustrate: 1. a construction platform; 2. a rotary digging machine; 3. bare rock; 4. guiding steel bars; 5. positioning reinforcing steel bars; 6. a steel pile casing; 7. a guide frame; 71. an outer frame; 72. a bearing strut; 73. a first hydraulic lever; 74. a second hydraulic lever; 75. a support part; 76. a pushing part; 8. and (5) hole guiding.
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the attached drawings and the preferred embodiment.
1-4, The pile foundation steel casing construction method under bare rock geological conditions comprises the following steps:
S1: because the surface of the bare rock 3 is an uneven surface, the steel casing 6 cannot be directly placed on the surface of the bare rock 3, the position of the steel casing 6 on the vertical projection surface of the bare rock 3 needs to be determined firstly, then a plurality of positioning steel bars 5 are inserted around the outer side of the edge of the projection surface and fixed, the positioning steel bars 5 are vertically inserted into the bare rock 3, the positioning steel bars 5 form a positioning cage sleeved at the bottom end of the steel casing 6, and the distance between the positioning steel bars 5 and the edge of the projection surface is 2-3mm;
S2: the steel pile casing 6 is hoisted and placed into a projection plane formed by encircling a plurality of positioning steel bars through a crane on the construction platform 1 to realize positioning, and the distance between the positioning steel bars 5 and the edge of the projection plane is 2-3mm, so that the diameter of the projection plane is slightly larger than that of the steel pile casing 6, the steel pile casing 6 is conveniently placed into a positioning cage, both ends of the steel pile casing 6 are limited to prevent deflection displacement of the steel pile casing 6, the preliminary positioning of the bottom of the steel pile casing 6 is realized, and the top of the steel pile casing 6 is limited through a guide frame 7 on the construction platform 1, so that both ends of the steel pile casing 6 are limited to prevent deflection displacement of the steel pile casing 6;
s3: after the steel pile casing 6 is initially positioned on the bare rock 3, the rotary excavator 2 descends along the steel pile casing 6 from the construction platform 1, so that the rotary excavator part performs hole digging and guiding 8 operation on the bare rock 3 by depending on the limit and protection of the steel pile casing 6, and the rotary excavator 2 can be prevented from shifting in the excavating process of the rotary excavator 2 under the limit action of the steel pile casing 6 on the rotary excavator 2.
Although the positioning cage is implanted to position the steel pile casing 6 after the position of the steel pile casing 6 is positioned in step S1, a certain construction error exists between the steps in the construction process, so that the position and the verticality of the steel pile casing 6 need to be detected again before the construction by using the rotary excavator 2 to ensure the construction precision, and therefore, in step S2, after the positioning of the two ends of the steel pile casing 6 is completed, the position and the verticality of the steel pile casing 6 need to be detected by the total station, and the position and the verticality of the steel pile casing 6 need to be adjusted by the guide frame 7 according to the deviation value of measured data and standard data.
In one embodiment, the guide frame 7 comprises an outer frame 71 and a limiting mechanism, wherein the outer frame 71 is fixedly arranged on the construction platform 1, one end of the limiting mechanism is fixed on the inner wall of the outer frame 71, and the other end of the limiting mechanism abuts against the side wall of the steel casing 6 to limit; the limiting mechanism is used for adjusting the position of the steel casing 6 according to the measured data of the total station until the position is within the standard data range.
Since the steel pile casing 6 needs to be lowered from the construction platform 1 into the positioning cage during the construction process, the vertical lowering or lifting of the steel pile casing 6 needs to be ensured during the process, the lowering of the general steel pile casing 6 is realized through the crane, and the crane and the rotary excavator 2 are positioned above the steel pile casing 6 during the process, so that the two machines cannot be used simultaneously, and frequent transfer is required during the construction process so as to facilitate the use of the other equipment, therefore, in order to improve the construction efficiency, in one embodiment, the limiting mechanism comprises a pushing component and a bearing component, the pushing component is propped against the side wall of the steel pile casing 6 through the pushing part 76, the bearing component is propped against the side wall of the steel pile casing 6 through the supporting part 75, and the steel pile casing 6 is longitudinally moved through controlling the pushing part 76 and the supporting part 75;
When the steel pile casing 6 is lowered in the step S2, the bearing component of the guide frame 7 applies upward supporting force to the steel pile casing 6, the pushing component applies reverse pushing force larger than the supporting force to the steel pile casing 6, the upward supporting force of the bearing component is larger than the gravity of the steel pile casing 6 after a set distance is reached, the pushing component stops applying force, the guide frame 7 only has the guiding and positioning function on the steel pile casing 6, the guide frame 7 is improved to have the longitudinal moving function on the steel pile casing 6, the pushing component drives the steel pile casing 6 to be lowered, the pushing component realizes automatic control through manual control or according to the set distance in a control device, the excavation efficiency of the guide hole 8 is improved through improvement on the guide frame 7, and the construction difficulty is reduced.
Since the rotary excavator 2 in the above embodiment excavates downwards in the steel casing 6, the diameter of the bare rock 3 excavated by the rotary excavator 2 is the inner diameter of the steel casing 6, and at this time, the bare rock 3 larger than the inner diameter of the steel casing 6 is abutted against the bottom of the side wall of the steel casing 6, so that the steel casing 6 is difficult to be lowered, and the steel casing 6 is blocked due to the probability of insufficient pushing by the pushing component on the guide frame 7, in the step S3, the steel casing 6 is longitudinally reciprocated by controlling the pushing part 76 and the supporting part 75 every time the rotary excavating part digs a certain depth, so that the steel casing 6 vibrates to descend to follow the downward excavating depth of the rotary excavating part;
after the pilot hole 8 is excavated, the steel casing 6 is reversely lifted by the pushing component and then pushed downwards again, so that bare rock 3 in the pilot hole 8, which is larger than the outer diameter part of the steel casing 6, falls off; the thickness of the side wall of the general steel pile casing 6 is 12mm, so that the thickness of bare rock 3 abutting against the bottom of the side wall of the steel pile casing 6 is equal to or less than 12mm, the structural strength is low, the steel pile casing 6 is lifted by the pushing component and then pushed downwards, the steel pile casing 6 has a certain impact force on the bare rock 3 with the thickness of 12mm, the bare rock 3 with the thickness of 12mm falls off from the side wall of the guide hole 8, and the structural strength of the bare rock 3 with the thickness of 12mm is low, so that the bottom of the steel pile casing 6 is difficult to curl after the bare rock is impacted, and the construction efficiency can be improved;
The steel pile casing 6 can gradually descend along with the descending of the rotary excavator 2 in the construction process, namely the rotary excavator 2 digs a certain distance, then the steel pile casing 6 is placed to the bottommost part, then the steel pile casing 6 continues to dig downwards, the top of the steel pile casing 6 is clamped by the guide frame 7 in the digging process of the rotary excavator 2, the steel pile casing 6 is prevented from falling off, the position and the perpendicularity of the steel pile casing 6 are detected through the total station after each step is completed in the alternate descending process of the steel pile casing 6 and the rotary excavator 2 until the design elevation position of the guiding hole 8 is reached, and the bearing component and the pushing component are locked after the position and the perpendicularity are detected and confirmed, so that the construction precision in the alternate descending process of the steel pile casing 6 and the rotary excavator 2 is ensured.
In S2, preliminary positioning of the steel casing 6 is realized through a positioning cage, however, in order to facilitate the placement of the steel casing 6 into the positioning cage, each steel bar on the positioning cage is 2-3mm away from the edge of the projection surface, after the steel casing 6 is placed into the positioning cage, a certain space is reserved between the inner wall of the positioning cage and the outer wall of the steel casing 6, meanwhile, as the surface of the bare rock 3 is uneven, only a part of the bottom of the steel casing 6 is contacted with the bare rock 3, and the other part is suspended, therefore, only the inner side wall of the positioning cage is used for providing a certain support for the steel casing 6, in order to further improve the positioning accuracy of the bottom of the steel casing 6, therefore, in step S2, if the surface of the bare rock 3 in the vertical projection range of the steel casing 6 is uneven, the bottom end surface of the steel casing 6 is propped against the highest point of the bare rock 3, the deflection displacement of the bottom end of the steel casing 6 is limited through the positioning cage, and meanwhile, the guide 4 is arranged circumferentially around the steel casing 6;
The guide steel bar 4 is obliquely inserted into the bare rock 3 and supports the top of the guide steel bar 4 on the side wall of the steel casing 6, meanwhile, as the outer side wall of the steel casing 6 is a smooth arc surface and has no fixed fulcrum, slipping easily occurs when the guide steel bar 4 is obliquely and laterally supported, and the guide steel bar 4 is fixed, so that the guide steel bar is offset when the guide steel bar 4 is possibly fixed, in one embodiment, the outer side wall of the steel casing 6 is provided with a notch, one end of the guide steel bar 4 is installed on the bare rock 3, and the other end of the guide steel bar is abutted in the notch;
Because the guide steel bar 4 is only used in the early construction stage of the steel pile casing 6, and the guide steel bar 4 only needs to be abutted and fixed on the side wall of the bottom of the steel pile casing 6, the notch on the outer side wall of the steel pile casing 6 can be only arranged at the bottom of the steel pile casing 6, holes are drilled on bare rock 3 when the guide steel bar 4 is installed, the guide steel bar 4 is gradually beaten into the holes after the steel pile casing 6 is placed at a preset position, and the upper end of the guide steel bar 4 is abutted and pressed in the notch after the guide steel bar 4 is completely installed in place, so that good lateral supporting force can be provided for the steel pile casing 6.
Because the steel casing 6 gradually moves downwards to the bottom of the guiding hole 8 along with the downwards digging of the rotary digger 2, and the guiding steel bars 4 squeeze the steel casing 6 and provide upward supporting force, the steel casing 6 can be disturbed when the steel casing 6 needs to be lowered, so in order to facilitate the subsequent construction of the steel casing 6, in step S3, when the depth of the guiding hole 8 dug by the rotary digger is greater than the maximum height difference of the surface roughness of the bare rock 3, the guiding steel bars 4 are removed and the steel casing 6 is caused to descend to follow the downwards dug depth of the rotary digger;
Namely, in the early stage, the steel casing 6 cannot be placed on the bare rock 3 due to the uneven surface of the bare rock 3, the steel casing 6 is accurately positioned and supported through the guide steel bar 4, after the uneven bare rock 3 is dug out by the rotary digger 2 to form an area capable of horizontally placing the steel casing 6 and then dug down for a certain distance, the steel casing 6 can be stably placed in the guide hole 8, in order to stably place the steel casing 6, the plane is a complete circular surface, the guide hole 8 is positioned in the projection surface, the projection surface is uneven, a complete circular surface can be formed only after the rotary digger 2 dug to the lowest point position of the guide hole 8, the continuous down-digging distance after the complete circular surface is formed is adjusted according to the actual condition in a construction site, the guide steel bar 4 is not needed, the guide steel bar 4 is removed, and the guide steel bar 4 can be directly cut into a plurality of sections and taken out in the middle part of the guide steel bar 4 in a dismantling process.
Because the guide frame 7 in the prior art is generally provided with four adjusting devices on four sides in a square frame, the adjusting devices are connected in the frame and apply pressure to four side walls of the steel casing 6 at the same time, when the position or the verticality of the steel casing 6 needs to be adjusted, four people need to adjust the steel casing 6 manually in four directions at the same time, the adjusting efficiency is low, and the precision is low, therefore, in one embodiment, the bearing components and the pushing components of the guide frame 7 are all arranged in the outer frame 71, the bearing components comprise a bearing strut 72 and a first hydraulic rod 73, one end of the bearing strut 72 and one end of the first hydraulic rod 73 are connected to the inner side wall of the outer frame 71, the other end of the first hydraulic rod 73 is connected to the bearing strut 72, the other end of the bearing strut 72 is provided with a supporting part 75, the pushing components comprise a second hydraulic rod 74 and a pushing part 76, the first hydraulic rod 73 and the second hydraulic rod 74 are used for adjusting the position and the verticality of the steel casing 6, and the supporting part 75 and the pushing part 76 are used for adjusting the upward supporting force and downward pushing force according to the height of the steel casing 6;
The first hydraulic rods 73 can be used for adjusting contact and separation of the supporting parts 75 on the bearing support rods 72 and the steel pile casing 6, linkage matching of the first hydraulic rods 73 in different directions can also be used for adjusting the position and the verticality of the steel pile casing 6, when the steel pile casing 6 is hoisted to the central hole of the guide frame 7 through the crane, the bearing support rods 72 are lifted by shortening the first hydraulic rods 73 at the same time, and after the steel pile casing 6 is positioned in the central hole of the guide frame 7, the supporting parts 75 are stretched at the same time and abutted against the side walls of the steel pile casing 6; in the process of adjusting the position and the verticality of the steel casing 6, when the first hydraulic rod 73 on one side is extended, the first hydraulic rod 73 on the opposite side is shortened, so that the steel casing 6 can move to the shortened side of the first hydraulic rod 73, and the like, the supporting part 75 provides an upward supporting force for the steel casing 6, the steel casing 6 is prevented from falling in the working process of the rotary excavator 2, and the steel casing 6 can be prevented from being offset and positioned before being fixed;
The second hydraulic rod 74 has the same function as the first hydraulic rod 73, and can be used for positioning and adjusting the steel pile casing 6, the pushing part 76 has a driving function, power is provided in the process that the steel pile casing 6 needs to move upwards or downwards, the supporting force of the supporting part 75 is larger than the gravity of the steel pile casing 6 when the steel pile casing 6 is in a fixed state, and the pushing force of the pushing part 76 is larger than the supporting force of the supporting part 75 when the steel pile casing 6 is in a moving state, so that the steel pile casing 6 can move quickly when the steel pile casing 6 needs to move quickly, and the steel pile casing 6 can also be slowly lowered when the steel pile casing 6 needs to be slowly lowered;
Pressure sensors are arranged between the first hydraulic rod 73 and the bearing support rod 72 and between the second hydraulic rod 74 and the pushing part 76, and the steel pile casing 6 is doubly fixed through a plurality of bearing components and pushing components, and the bearing components and the pushing components are located at different heights, so that when the steel pile casing 6 is in a vertical state, the pressure data of each pressure sensor are different in a certain range, when a plurality of pressure sensors at different heights have pressure differences, the fact that the verticality deviation of the steel pile casing 6 is larger is indicated, and the adjustment can be performed by referring to the data of the pressure sensors.
Since the outer side wall surface of the steel casing 6 is smooth or is a circular arc plane, the friction force is small, the first hydraulic rod 73 and the second hydraulic rod 74 are required to apply larger pressure to the steel casing 6 to fix the steel casing, and the steel casing 6 is easy to deviate due to pressure difference when larger pressure is applied at different angles, and the grooves are only distributed at the bottom position of the steel casing 6 in the embodiment, therefore, in one embodiment, the grooves are arranged on the outer side wall of the steel casing 6 along the axial direction of the steel casing to form a plurality of friction belts, and the supporting part 75 and the pushing part 76 are abutted on the friction belts for increasing friction force and supporting force;
The friction belt extends from the bottom to the top along the axial direction of the steel casing 6 on the side wall of the steel casing 6, and then a larger friction force can be provided after the supporting part 75 and the pushing part 76 are abutted against the friction belt, so that the pressure applied by the first hydraulic rod 73 and the second hydraulic rod 74 to the friction belt can be reduced, the offset of the steel casing 6 is further reduced, and the construction precision and efficiency are improved.
In one embodiment, the supporting portion 75 includes a first rotating wheel set and a motor disposed on the bearing strut 72, and the pushing portion 76 includes a second rotating wheel set and a motor disposed on the second hydraulic lever 74, where the two motors are respectively used to drive the first rotating wheel set and the second rotating wheel.
Because the general structure for supporting and having the function of moving other objects drives the rotating wheel to rotate through the motor, and the steel casing 6 in the embodiment has heavier weight, the moment required by directly driving the rotating wheel to rotate through the motor is larger, the moving effect of the steel casing 6 with heavier weight is poorer, and a certain supporting force is required to be provided for the steel casing 6 with heavier weight through applying larger pressure, in one embodiment, the first rotating wheel group comprises a driving wheel and a driven wheel, the output shaft of the motor is connected with the driving wheel, the driving wheel and the driven wheel are connected through a driving belt, and the driving belt at the driven wheel is abutted on the steel casing 6;
The torque moment of the motor is overlarge, the larger torque requires larger power and is easy to damage the motor because the rotating wheel is directly driven by the motor, and the size of the driving wheel is larger than that of the driven wheel by arranging the driving wheel and the driven wheel to drive the driven wheel to rotate, so that the rotating speed can be reduced, the torque is increased, the acting force on the steel casing 6 is improved, the output power of the motor is saved, and the volume of the motor can be reduced under the same output power.
Since the friction belt is abutted against the supporting portion 75 and the pushing portion 76 to increase the friction force in the above embodiment, however, since the construction scene is water, the steel casing 6 is easy to slip after the surface of the steel casing 6 is adhered with water, and the steel casing 6 is likely to slide down to a small extent when the steel casing 6 is required to be stopped to be positioned, so that deviation occurs in the verticality of the steel casing, in one embodiment, the transmission belt is a transmission chain made of metal, teeth engaged with grooves on the friction belt are arranged on the transmission chain, and the grooves and the teeth are engaged to increase the bearing force;
The notch of the friction belt on the steel pile casing 6 is equidistantly arranged, the teeth on the transmission chain are correspondingly equidistantly arranged, when the motor drives the driving wheel to rotate with the driven wheel to rotate the transmission chain, the teeth on the transmission chain are in one-to-one correspondence with the notch on the steel pile casing 6 and form an upward supporting effect on the steel pile casing 6, and the first hydraulic rod 73 can enable the steel pile casing 6 to be kept at a fixed height without providing larger pressure so as not to slide downwards, so that the construction precision and the construction safety can be improved.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (3)
1. A pile foundation steel casing construction method under bare rock geological conditions is characterized in that: the method comprises the following steps:
S1: calibrating the vertical projection range of the steel casing on the surface of the bare rock, and implanting a plurality of positioning steel bars into the bare rock around the edge of the projection range, so that the positioning steel bars form a positioning cage for fixedly sleeving the bottom end of the steel casing;
s2: the top end of the steel pile casing is mounted on the construction platform in a limiting manner through a guide frame, and the steel pile casing is hoisted to enable the bottom end of the steel pile casing to be embedded into the positioning cage, so that the two ends of the steel pile casing are limited to prevent deflection displacement of the steel pile casing;
s3: the rotary digging machine descends along the steel pile casing from the construction platform, so that the rotary digging part digs and guides the bare rock by depending on the limit and the protection of the steel pile casing;
In the step S2, after the two ends of the steel casing are positioned, detecting the position and the verticality of the steel casing by a total station, and adjusting the position and the verticality of the steel casing by a guide frame according to the deviation value of measured data and standard data;
the guide frame comprises an outer frame and a limiting mechanism, the outer frame is fixedly arranged on the construction platform, one end of the limiting mechanism is fixed on the inner wall of the outer frame, and the other end of the limiting mechanism abuts against the side wall of the steel casing to limit;
The limiting mechanism comprises a pushing component and a bearing component, the pushing component is propped against the side wall of the steel casing through a pushing part, the bearing component is propped against the side wall of the steel casing through a supporting part, and the steel casing is longitudinally moved through controlling the pushing part and the supporting part;
in the step S3, each time the rotary digging portion digs a certain depth, the pushing portion and the supporting portion are controlled to enable the steel casing to longitudinally reciprocate, so that the steel casing vibrates to follow the downward digging depth of the rotary digging portion;
The bearing assembly further comprises a bearing supporting rod and a first hydraulic rod, one end of the bearing supporting rod and one end of the first hydraulic rod are connected to the inner side wall of the outer frame, and the other end of the first hydraulic rod is connected to the bearing supporting rod; the pushing component comprises a second hydraulic rod; the supporting part and the pushing part are respectively connected to the other ends of the bearing support rod and the second hydraulic rod, the bearing components and the pushing components are four groups, the four groups of bearing components and the pushing components are respectively in circumferential array butt joint with the side wall of the steel casing, and the position and the verticality of the steel casing are adjusted through the first hydraulic rod and the second hydraulic rod;
the outer side wall of the steel protective cylinder is provided with notch grooves, the notch grooves are arranged on the outer side wall of the steel protective cylinder along the axial direction of the steel protective cylinder to form a plurality of friction belts, and the supporting part and the pushing part are abutted on the friction belts for increasing friction force and supporting force;
The supporting part comprises a first rotating wheel group arranged on the bearing support rod, the first rotating wheel group comprises a driving wheel and a driven wheel, the driving wheel is connected with the driven wheel through a driving belt, the driving belt is a driving chain made of metal materials, teeth matched with grooves on the friction belt are arranged on the driving chain, and the grooves and the teeth are matched to increase bearing capacity.
2. The pile foundation steel casing construction method under bare rock geological conditions of claim 1, wherein the construction method comprises the following steps: in step S2, if the surface of the bare rock is uneven within the vertical projection range of the steel casing, the bottom end surface of the steel casing abuts against the highest point of the bare rock, the deflection displacement of the bottom end of the steel casing is limited by the positioning cage, and meanwhile, guide steel bars are circumferentially arranged around the steel casing.
3. The pile foundation steel casing construction method under bare rock geological conditions according to claim 2, wherein the construction method comprises the following steps: and in the step S3, when the depth of the digging guiding hole of the rotary digging part is larger than the maximum height difference of the surface roughness of the bare rock, the guide steel bar is removed, and the steel casing is enabled to descend to follow the downward digging depth of the rotary digging part.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8157481B1 (en) * | 1994-05-02 | 2012-04-17 | Shell Oil Company | Method for templateless foundation installation |
| CN112726611A (en) * | 2020-12-30 | 2021-04-30 | 湖北工建基础设施建设有限公司 | Lifting device and method for positioning and mounting steel casing of deepwater cast-in-situ bored pile |
| CN116479888A (en) * | 2023-06-15 | 2023-07-25 | 中国建筑第六工程局有限公司 | Deep water inclined uneven bare rock area steel casing positioning device and pile foundation pore-forming method |
| CN116676964A (en) * | 2023-07-27 | 2023-09-01 | 中国建筑第六工程局有限公司 | Bare rock pile foundation construction method under tidal action |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8157481B1 (en) * | 1994-05-02 | 2012-04-17 | Shell Oil Company | Method for templateless foundation installation |
| CN112726611A (en) * | 2020-12-30 | 2021-04-30 | 湖北工建基础设施建设有限公司 | Lifting device and method for positioning and mounting steel casing of deepwater cast-in-situ bored pile |
| CN116479888A (en) * | 2023-06-15 | 2023-07-25 | 中国建筑第六工程局有限公司 | Deep water inclined uneven bare rock area steel casing positioning device and pile foundation pore-forming method |
| CN116676964A (en) * | 2023-07-27 | 2023-09-01 | 中国建筑第六工程局有限公司 | Bare rock pile foundation construction method under tidal action |
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