CN115874609A - Construction method of large-diameter overlong cast-in-place pile - Google Patents
Construction method of large-diameter overlong cast-in-place pile Download PDFInfo
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- CN115874609A CN115874609A CN202310019288.6A CN202310019288A CN115874609A CN 115874609 A CN115874609 A CN 115874609A CN 202310019288 A CN202310019288 A CN 202310019288A CN 115874609 A CN115874609 A CN 115874609A
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Abstract
The application relates to a construction method of a large-diameter overlong cast-in-place pile, which relates to the technical field of cast-in-place pile construction technology and comprises the following steps: construction preparation: leveling a construction site, and tamping and filling tightly; embedding a steel casing: adopting mechanical excavation to embed a pile casing; drilling: static slurry wall protection is adopted in the drilling process; a pore-forming inspection step: when the drilling depth meets the design requirement, checking hole position, hole diameter, hole depth, inclination and the like; hole cleaning: cleaning holes by adopting a pulp changing method; manufacturing and installing a reinforcement cage: pile foundation reinforcement cages are manufactured in a reinforcement yard in a centralized manner; the steel reinforcement cage is installed by adopting an automobile crane; a conduit installation step: hoisting the guide pipe into the hole; and (3) secondary hole cleaning: secondary hole cleaning is carried out by utilizing a guide pipe; pouring underwater concrete: underwater concrete pouring is continuously carried out; removing the guide pipe and the steel casing: after the underwater concrete is poured, the underwater concrete is slowly pulled out by a crane. This application has the effect of the big problem of the degree of difficulty when improving bored concrete pile construction.
Description
Technical Field
The application relates to the field of cast-in-place pile construction technology, in particular to a construction method of a large-diameter overlong cast-in-place pile.
Background
Currently, a cast-in-place pile refers to a pile formed by forming a pile hole in foundation soil through mechanical drilling, steel pipe soil extrusion or manual excavation on an engineering site, placing a reinforcement cage and pouring concrete in the pile hole, and the cast-in-place pile can be classified into a sinking pipe cast-in-place pile, a cast-in-place pile and a cast-in-place pile according to different hole forming methods. The cast-in-situ bored pile is widely applied due to the advantages of high construction efficiency, high drilling speed, low cost, small occupied area and the like.
In view of the above-mentioned related technologies, the applicant believes that when the geological conditions of the drilling below the ground are complex, due to different geological conditions of the depth below the ground, the drilling is normally performed downwards, which easily causes the drilled hole to collapse or the drilled hole does not reach the predetermined standard, and further causes the construction difficulty to increase.
Disclosure of Invention
In order to solve the problem of high difficulty in cast-in-place pile construction, the application aims to provide a large-diameter overlong cast-in-place pile construction method.
The construction method of the large-diameter overlong cast-in-place pile adopts the following technical scheme:
the construction method of the large-diameter overlong cast-in-place pile comprises the following steps:
construction preparation: before the construction of the pile foundation, the condition of the buried pipeline is firstly detected, then the construction site is leveled, and the construction site is tamped; for softer ground, soft soil is replaced, road base plates are laid at the operation position of the drilling machine after being compacted, and smooth slope surfaces need to be rolled and trimmed between a construction site and a sidewalk, so that the drilling machine and construction vehicles can smoothly enter and exit from the construction sidewalk;
embedding a steel casing: the method comprises the following steps of (1) embedding a pile casing by adopting mechanical excavation, firstly excavating soil within the embedding depth range of the pile casing at a hole position by using a rotary drilling bit, and then directly pressing the pile casing into the soil after the pile casing is hoisted in place by using the rotary drilling bit; when the length of the pile casing is smaller than the depth of the hole, the pile casing is butted on site through a pile casing butting device, and if the length of the butted pile casing is larger than the depth of the hole, a section of the pile casing higher than the hole is cut off;
a drilling machine positioning step: before the drilling machine is in place, a measurer needs to retest the pile position and then reports to a supervision engineer for rechecking, the diameter of a drill bit, the gradient of a drill rod, a base and the top end are checked to ensure stability, and the position deviation of the center of the drill bit and the center of a drill hole is controlled within a range of 2 cm;
drilling: according to project geological conditions, a rotary drilling rig and a circulating drilling rig are selected for pile foundation construction, communicated elevation is measured before drilling, actual hole depth is calculated, a static mud retaining wall is adopted in the drilling process, and different drill bits, drilling pressures, drilling speeds and proper mud proportions are selected for different geological layers according to design geological and hydrological data; during the hole drilling construction, the drilling is slowly carried out under light pressure, the rotating speed of a drill bit is not more than 10 revolutions per minute, normal drilling can be gradually accelerated after drill rods completely enter holes, slow drilling is carried out at a slow rotating speed in loose and easily collapsed strata such as sand layers, the specific gravity and viscosity of slurry are increased, and hole sweeping times are increased during drilling of the stratum which is easily reduced in diameter; continuously performing drilling operation in shifts, paying attention to stratum changes all the time, fishing out sampling slag in time, storing and checking geological conditions, and filling drilling construction records; under normal conditions, taking sample slag once according to 2m, and adding once when geology changes; when the geology is not accordant with the design, the geology is carried out once every 0.3 to 0.5 m;
a pore-forming inspection step: when the drilling depth meets the design requirement, checking hole position, hole diameter, hole depth, inclination and the like;
hole cleaning: cleaning the hole by adopting a slurry changing method, injecting the treated slurry into the hole, and changing the slurry containing suspended drilling slag in the hole;
manufacturing and installing a reinforcement cage: pile foundation reinforcement cages are manufactured in a reinforcement field in a centralized manner, 4 positioning lug reinforcements are uniformly distributed on the reinforcement cages every 2m along the periphery of a pile body, and pile head reinforcements extending into a bearing platform part are wrapped by pearl cotton sleeves so as to facilitate pile head chiseling in the later period; the steel reinforcement cage is installed by adopting an automobile crane, and the steel reinforcement cage is lifted by the carrying pole beam and is gradually lowered;
a conduit installation step: after the guide pipe is assembled, the axis deviation does not exceed 0.5% of the drilling depth and is not more than 10cm, and the test pressure is 1.5 times of the hydrostatic pressure of the hole bottom; when the guide pipe is hoisted into the hole, the rubber ring or the rubber pad is placed rightly and tightly to ensure good sealing;
and (3) secondary hole cleaning: checking the thickness of the sediments again before pouring the underwater concrete, and performing secondary hole cleaning by using the guide pipe when the thickness of the sediments of the friction pile is more than 20cm or the thickness of the columnar sediments is more than 5 cm;
pouring underwater concrete: the quantity of the first-batch bottom sealing concrete is controlled, certain impact energy is generated when the first-batch bottom sealing concrete falls, slurry can be discharged from the guide pipe, and the lower opening of the guide pipe is embedded into the concrete to be not less than 1m and not more than 3m; the underwater concrete pouring is ensured to be continuously carried out, the buried depth of the guide pipe in the concrete is controlled to be 2-6 m in the pouring process, and the pouring top surface of the underwater concrete is controlled according to the height 1m higher than the design height of the pile top, so that the quality of the pile top concrete is ensured;
removing the guide pipe and the steel casing: after the underwater concrete pouring is finished, the residual guide pipe and the steel casing are slowly pulled out by a crane for recycling.
By adopting the technical scheme, when drilling, the diameter of the drill bit, the gradient of the drill rod, the base and the top end are checked to ensure stability, so that the stability of the drill bit during operation can be improved, and in the drilling process, the static slurry retaining wall is adopted, so that slurry can form a mud skin on the surface of the hole wall in the circulating process, and the mud skin and the self weight of the slurry play a role in protecting the hole wall, and the hole wall is prevented from collapsing; different drill bits, drilling pressures and drilling speeds are adopted according to different geologies, so that the stability of drilling is improved by adopting different drilling methods under different geological conditions; finally, timely fishing out the sampling slag, storing and checking the geological condition, and filling a drilling construction record, so that the design and the geological condition can be kept consistent, and the whole drilling process can be more stable and faster; by the method, the probability of collapse or failure of drilled holes to meet the preset standard can be reduced during drilling, so that the difficulty in cast-in-place pile construction is reduced.
Optionally, the pile casing docking device comprises a rack, an upper clamping mechanism, a lower clamping mechanism, a driving mechanism and a welding mechanism; the driving mechanism is arranged on the rack, the upper clamping mechanism and the lower clamping mechanism are both arranged on the driving mechanism, the upper clamping mechanism and the lower clamping mechanism are used for clamping one protection cylinder respectively, and the driving mechanism is used for simultaneously driving the upper clamping mechanism and the lower clamping mechanism to clamp the two protection cylinders respectively and enable the two clamped protection cylinders to be opposite to each other; the welding mechanism is arranged between the upper clamping mechanism and the lower clamping mechanism and is used for welding two opposite protective cylinders.
Through adopting above-mentioned technical scheme, when docking two pile casings, through last fixture and fixture centre gripping one section of pile casing respectively down, then let fixture and fixture centre gripping down press from both sides two sections pile casings tightly respectively through actuating mechanism, make two pile casings be in the state of coaxial line and butt joint, and let the butt joint department of two pile casings be in fixture and lower fixture between, carry out the circumference welding through the butt joint department of welding mechanism to two pile casings after that, thereby let two pile casings directly become a longer pile casing, and then make things convenient for the darker stake hole of adaptation.
Optionally, the driving mechanism includes a rotating motor, a bidirectional threaded rod, a moving cylinder and a connecting bracket; the rotating motor is arranged on the frame, and the bidirectional threaded rod is coaxially arranged on an output shaft of the rotating motor; the inner wall of the moving cylinder is provided with threads matched with the bidirectional threaded rod; the bidirectional threaded rod is formed by coaxially connecting a forward-rotation threaded column and a reverse-rotation threaded column, the forward-rotation threaded column and the reverse-rotation threaded column are both sleeved with the moving cylinder in a threaded manner, the connecting support is arranged on the moving cylinder, and the upper clamping mechanism and the lower clamping mechanism are arranged on the connecting support; the rack is further provided with a limiting guide assembly, and the limiting guide assembly is used for enabling the moving cylinder to move along the length direction of the bidirectional threaded rod.
By adopting the technical scheme, the rotating motor is started, so that the output shaft of the rotating motor rotates to drive the bidirectional threaded rod to rotate, and at the moment, the two moving cylinders approach to or move away from each other under the rotation of the bidirectional threaded rod under the limitation of the limiting guide assembly; when the two movable cylinders are driven to be close to each other, the two connecting supports can be close to each other, the upper clamping mechanism and the lower clamping mechanism can simultaneously clamp the two protective cylinders, and therefore the effect that the upper clamping mechanism and the lower clamping mechanism are driven to clamp the protective cylinders is achieved.
Optionally, the upper clamping mechanism comprises a first upper clamping plate and a second upper clamping plate, the first upper clamping plate and the second upper clamping plate are respectively connected with the connecting bracket through an upper cross rod, and the first upper clamping plate is opposite to the plate surface of the second upper clamping plate; the lower clamping mechanism comprises a first lower clamping plate and a second lower clamping plate, the first lower clamping plate and the second lower clamping plate are respectively connected with the connecting support through a lower cross rod, and the plate surfaces of the first lower clamping plate and the second lower clamping plate are opposite; the upper clamping plate I and the lower clamping plate I are flush, and the lower clamping plate I and the lower clamping plate II are flush.
Through adopting above-mentioned technical scheme, when two linking bridge were close to each other, relative positive punch holder one and punch holder two then can be close to each other, relative positive lower plate one also can be close to each other with lower plate two to protect a section of thick bamboo centre gripping simultaneously with two, and punch holder one and lower plate one also keep level mutually, lower plate one and lower plate two also keep level mutually, can guarantee that two protect a section of thick bamboo and be in relative positive state, guarantee two and protect the connection stability of a section of thick bamboo.
Optionally, the upper clamp plate I, the upper clamp plate II, the lower clamp plate I and the lower clamp plate II are arc plates matched with the side wall of the protective cylinder.
Through adopting above-mentioned technical scheme, the setting up of arc can let punch holder one, punch holder two, lower plate one and two homoenergetic of lower plate closely laminate on protecting a section of thick bamboo, promotes the centre gripping stability that the centre gripping protected a section of thick bamboo.
Optionally, the limiting guide assembly comprises a guide rail, the guide rail is mounted on the frame, the length direction of the guide rail is consistent with that of the bidirectional threaded rod, a limiting groove is formed in the guide rail along the length direction of the guide rail, a limiting block is arranged on the movable cylinder, and the limiting block is in sliding fit with the limiting groove.
Through adopting above-mentioned technical scheme, after the stopper on removing a section of thick bamboo inserted the spacing inslot, remove a section of thick bamboo and just can receive the restriction in the ascending rotation of self circumference direction to reach and let remove the effect that a section of thick bamboo can stably remove along the length direction of two-way screw rod.
Optionally, the welding mechanism includes an electric welding assembly and an adjusting assembly, the adjusting assembly is mounted on the connecting bracket, and the electric welding assembly is mounted on the adjusting assembly; the electric welding assembly is used for welding the butt joint of the two pile casings, and the adjusting assembly is used for adaptively adjusting the position of the electric welding assembly so that the electric welding assembly can align the butt joint of the two pile casings.
Through adopting above-mentioned technical scheme, after two protect a butt joint, directly adjust the position of welding the subassembly through adjusting part for it can aim at the butt joint department of two protect a to weld the subassembly, thereby conveniently welds, promotes the adaptability when welding.
Optionally, the electric welding assembly comprises an electric welding gun, and a nozzle of the electric welding gun faces the side of the protective sleeve; the adjusting component comprises an adjusting plate, a sleeve, a straight pipe, a sliding rod, a spring, a transmission box, a gear, a rack, a connecting rod, a transmission rod and a drive plate; the adjusting plate is mounted on the connecting support, a sliding groove is vertically formed in the adjusting plate, and the length direction of the sliding groove is consistent with that of the protective cylinder; the sleeve is sleeved on the electric welding gun, the two sides of the sleeve of the straight pipe are respectively provided with one sliding rod, the sliding rods are slidably inserted on the straight pipe, the springs are arranged in the straight pipe, and the springs enable the sliding rods to always have the tendency of moving towards the side far away from the straight pipe; abutting grooves are formed in the two inner walls of the sliding groove along the length direction of the sliding groove, and the sliding rod is opposite to the abutting grooves; the transmission box is arranged at one end of the electric welding gun, the transmission rod is rotatably arranged on the transmission box in a penetrating mode, one end of the transmission rod extends into the transmission box, the gear is coaxially arranged at one end, located in the transmission box, of the transmission rod, the racks are arranged on the transmission box and located on two sides of the gear in a sliding mode respectively, and one part, located in the transmission box, of each of the two racks is meshed with the gear; the connecting rod is arranged on the sliding rod, and one end of the rack, which is far away from the transmission box, is connected with the connecting rod; the drive plate is coaxially arranged at one end, far away from the transmission box, of the transmission rod.
By adopting the technical scheme, when the gun head of the electric welding gun is not aligned with the joint of the two protection cylinders, the drive plate is rotated firstly, so that the drive plate drives the gear to rotate, the two racks move towards the direction close to each other, at the moment, the racks are connected with the sliding rod through the connecting rod, when the racks move towards the side close to the transmission box, the two sliding rods can be simultaneously pulled to move towards the straight pipe, the end parts of the sliding rods are not abutted against the abutting groove, at the moment, the electric welding gun can be controlled to slide up and down in the length direction of the sliding groove, and the position of the electric welding gun is adjusted so that the gun mouth of the electric welding gun is aligned with the abutting joint of the two protection cylinders; after loosening the driver plate, the spring can let the slide bar remove toward the direction of keeping away from the straight tube again and finally the butt on the inside wall in butt groove under self elastic action, after two slide bars all butt on the inside wall in butt groove, the electric welding gun can be spacing at current position to reach the comparatively convenient effect in position of fixed electric welding gun and the position of adjusting electric welding gun.
Optionally, the connecting supports are provided with semicircular arc-shaped rails, when the upper clamping mechanism and the lower clamping mechanism both clamp the pile casings and enable the two pile casings to be in butt joint, the semicircular arc-shaped rails on the two connecting supports form a complete circular rail, and the adjusting plate is provided with rollers in sliding fit with the semicircular arc-shaped rails.
Through adopting above-mentioned technical scheme, when last fixture all gripped when protecting a section of thick bamboo with lower fixture, at this moment two semi-circular arc tracks also can form a circular track, and because the regulating plate passes through gyro wheel and semi-circular arc track sliding fit, consequently can let the electric welding gun remove at will on the circumferential direction who protects a section of thick bamboo, and then conveniently weld the butt joint department that protects a section of thick bamboo.
Optionally, a holding handle is arranged on the adjusting plate.
Through adopting above-mentioned technical scheme, the setting of gripping the handle can make things convenient for the staff to adjust the position of adjusting plate.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when drilling, the diameter of the drill bit, the gradient of the drill rod, the base and the top end are checked to ensure stability, so that the stability of the drill bit during operation can be improved, and in the drilling process, static slurry is adopted to protect the wall so as to form a mud skin on the surface of the hole wall in the circulating process of the slurry, protect the hole wall by the mud and prevent the hole wall from collapsing; different drill bits, drilling pressures and drilling speeds are adopted according to different geologies, so that the stability of drilling is improved by adopting different drilling methods under different geological conditions; finally, sampling slag is fished in time to store and check the geological condition, and a drilling construction record is filled, so that the design can be ensured to be consistent with the geological condition, and the whole drilling process can be more stable and faster; by the method, the probability of collapse or failure of drilled holes to meet the preset standard can be reduced during drilling, so that the effect of reducing the difficulty of cast-in-place pile construction is achieved;
2. when two pile casings are butted, one section of pile casing is clamped by the upper clamping mechanism and the lower clamping mechanism respectively, then the upper clamping mechanism and the lower clamping mechanism clamp the two sections of pile casings respectively through the driving mechanism, so that the two pile casings are in a coaxial and butted state, the butted part of the two pile casings is positioned between the upper clamping mechanism and the lower clamping mechanism, and then the butted part of the two pile casings is circumferentially welded through the welding mechanism, so that the two pile casings are directly changed into a longer pile casing, and further the pile casing is convenient to adapt to a deeper pile hole;
3. when the gun head of the electric welding gun is not aligned with the joint of the two protection cylinders, the driving plate is rotated firstly, so that the driving plate drives the gear to rotate, and the two racks move towards the direction close to each other; after loosening the driver plate, the spring can let the slide bar remove toward the direction of keeping away from the straight tube again and finally the butt on the inside wall in butt groove under self elastic action, after two slide bars all butt on the inside wall in butt groove, the electric welding gun can be spacing at current position to reach the comparatively convenient effect in position of fixed electric welding gun and the position of adjusting electric welding gun.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;
fig. 2 is a partial schematic view for showing a casing docking device according to an embodiment of the present application;
FIG. 3 is a partial cross-sectional view of an embodiment of the present application showing the connection of an adjustment assembly to an electric welding assembly;
FIG. 4 is a partial cross-sectional view of an embodiment of the present application showing the connection of the adjustment plate to the semicircular arcuate track;
in the figure, 1, a pile casing butt joint device; 2. a frame; 3. an upper clamping mechanism; 31. a first upper clamping plate; 32. a second upper clamping plate; 4. a lower clamping mechanism; 41. a first lower clamping plate; 42. a second lower clamping plate; 5. a drive mechanism; 51. rotating the motor; 52. a bidirectional threaded rod; 521. a positive-rotation threaded post; 522. reversely rotating the threaded column; 53. moving the drum; 531. a limiting block; 54. connecting a bracket; 6. a welding mechanism; 7. a limiting guide component; 71. a guide rail; 711. a limiting groove; 8. an electric welding assembly; 81. an electric welding gun; 9. an adjustment assembly; 91. an adjusting plate; 911. a sliding groove; 9111. a butt joint groove; 912. a grip handle; 913. a roller; 92. a sleeve; 93. a straight pipe; 94. a slide bar; 95. a spring; 96. a transmission box; 97. a gear; 98. a rack; 99. a connecting rod; 901. a transmission rod; 902. a dial; 10. semicircular arc-shaped tracks.
Detailed Description
The present application is described in further detail below with reference to fig. 1-4.
A construction method of a large-diameter overlong cast-in-place pile refers to fig. 1, and comprises the following steps:
construction preparation: before pile foundation construction, the condition of a buried pipeline is firstly detected, then a construction site is leveled, and tamping and filling are dense, so that the phenomena that a drilling machine is unstable in the drilling process, safety accidents occur and the engineering quality is influenced are prevented; for softer ground, soft soil is replaced, road base plates are laid at the operation position of the drilling machine after compaction, and smooth slopes need to be rolled and finished between the construction site and the sidewalk, so that the drilling machine and construction vehicles can smoothly enter and exit from the construction sidewalk; the arrangement of a drilling site is carried out, the arrangement positions of a mud pit, a reinforcement cage, a guide pipe, a hopper and construction machinery are clearly planned, and the requirements of drilling machine operation and displacement, mud circulation system arrangement, concrete pouring operation and the like are met; lofting the pile position, embedding a cross pile guard which is higher than the top surface of the pile casing and needs to be reinforced and protected by mortar or concrete for inspecting the pile position in the drilling process; a field technician checks at any time to ensure that the pile protector cannot be displaced; the mud ponds are all arranged on the left sides of the large mileage directions of the lines, the size of each mud pond is 6m multiplied by 12m multiplied by 2.5m, and the mud ponds are timely surrounded after being dug; the mud tank is divided into a sedimentation tank and a mud storage tank, mud with drilling slag flowing out of the drilling hole flows into the sedimentation tank through a mud tank, flows into the mud storage tank after being preliminarily precipitated by the sedimentation tank for being sucked by a mud pump, and is uniformly mixed by a mud stirring machine in the mud tank for later use;
embedding a steel casing: the steel casing is made of a steel plate with the thickness of 12mm, the length of the steel casing is 6m, and the requirements of different drilling modes on the rigidity and the strength of the casing are met; adopting mechanical excavation to bury the pile casings, firstly excavating soil within the burying depth range of the pile casings at hole sites by using a rotary drilling bit, and then directly pressing the pile casings into the soil after hoisting the pile casings in place by using the rotary drilling bit; when the length of the pile casing is smaller than the depth of the hole, the pile casing is butted on site through the pile casing butting device 1, and if the length of the butted pile casing is larger than the depth of the hole, a section of the pile casing higher than the hole is cut off; the embedding of the pile casing meets the standard requirement; the outer side of the pile casing is filled with clay and tamped, and surface water is prevented from permeating along the position;
a drilling machine positioning step: before the drilling machine is in place, a measurer needs to retest the pile position and then reports to a supervision engineer for retesting, and various preparation works before drilling are checked, wherein the preparation works comprise the checking and maintenance of main machine and tool equipment, the diameter of a drill bit, the gradient of a drill rod, a base and the top end are ensured to be stable, and the deviation of the center of the drill bit and the center of the drill hole is controlled within the range of 2 cm;
drilling: according to project geological conditions, a rotary drilling rig and a circulating drilling rig are selected for pile foundation construction, the communicated elevation is measured before drilling, the actual hole depth is calculated, a static mud retaining wall is adopted in the drilling process, and different drill bits, drilling pressures, drilling speeds and proper mud proportions are selected for different geological layers according to design geological and hydrological data; during the hole opening construction, the drilling is slowly advanced under light pressure, the rotating speed of a drill bit is not more than 10 revolutions per minute, normal drilling can be gradually accelerated after drill rods completely enter holes, slow drilling is slowly carried out at a low rotating speed in loose and easily collapsed strata such as a sand layer, the specific gravity and the viscosity of slurry are increased, and the hole sweeping times are increased when the stratum which is easily reduced in diameter is drilled; continuously performing drilling operation in shifts, paying attention to stratum changes all the time, fishing out sampling slag in time, storing and checking geological conditions, and filling drilling construction records; under normal conditions, taking sample slag once according to 2m, and adding once when geology changes; when the geology is not accordant with the design, the geology is carried out once every 0.3 to 0.5 m;
a pore-forming inspection step: when the drilling depth meets the design requirement, checking hole positions, hole diameters, hole depths, inclination and the like, and performing hole forming detection by adopting a cage type hole detector, wherein the hole detector is manufactured according to the standard requirement, and has the outer diameter of 1m and the length of 6m;
hole cleaning: cleaning the hole by adopting a slurry changing method, injecting the treated slurry into the hole, changing the slurry containing suspended drilling slag in the hole, testing the index of the slurry after cleaning the hole by field testers, and ensuring that the slurry discharged from the hole has no particles with the diameter of 2-3 mm when being touched by hands;
manufacturing and installing a reinforcement cage: pile foundation reinforcement cages are manufactured in a reinforcement field in a centralized mode, 4 positioning lug reinforcements are uniformly distributed on the periphery of a pile body of each reinforcement cage every 2m, and pile head reinforcements extending into a bearing platform part are wrapped by pearl cotton sleeves so as to facilitate pile head chiseling in the later period; after the processing of the steel reinforcement cage is finished, the steel reinforcement cage is transported to the site for storage, the lower part of the steel reinforcement cage is supported by a support, and the upper part of the steel reinforcement cage is covered by color stripe cloth; the steel reinforcement cage is installed by adopting an automobile crane, and the steel reinforcement cage is lifted by the carrying pole beam and is gradually lowered; after the lowering is finished, the positioning and fixing are carried out at the orifice, so that the floating cage phenomenon is avoided in the concrete pouring process, the coincidence of the reinforcement cage and the center of the hole site is ensured, and the length of the hanging rib is accurate; the sound measuring pipes are connected by adopting threaded sleeves, water injection inspection is carried out on each sound measuring pipe, and the sound measuring pipes and the reinforcement cage are bound and fixed by iron wires at positions 1m above and below the connecting joints; the middle part of the steel bar cage is fixed with the sounding pipe by a positioning ring, so that the sounding pipe is ensured to be installed smoothly, straightly and firmly;
a conduit installation step: the inner wall of the guide pipe is smooth and round, the inner diameter is consistent, the interface is tight, the diameter is 30cm, test assembly and pressure test are carried out before the guide pipe is used, the axis deviation does not exceed 0.5% of the drilling depth and is not more than 10cm after the guide pipe is assembled, and the test pressure is 1.5 times of the hydrostatic pressure at the bottom of the hole; when the guide pipe is hoisted into the hole, the rubber ring or the rubber cushion is placed rightly and tightly to ensure good sealing;
and (3) secondary hole cleaning: checking the thickness of the sediments again before pouring the underwater concrete, and performing secondary hole cleaning by using the guide pipe when the thickness of the sediments of the friction pile is more than 20cm or the thickness of the columnar sediments is more than 5 cm; testing the specific gravity, sand content and viscosity of the slurry after hole cleaning, and immediately pouring underwater concrete after the hole cleaning is qualified;
pouring underwater concrete: the pile foundation concrete is all intensively mixed by adopting a concrete mixing station, the concrete is transported to the site by a concrete tanker, the site inspection is carried out on the concrete on site by experimenters before the pouring, the slump, the expansion and the air content indexes must meet the design requirements of the mix proportion, standard maintenance test pieces are manufactured according to the stipulation, and each pile must not be less than 2 groups of test pieces; the quantity of the first batch of bottom sealing concrete is controlled, certain impact energy is generated when the first batch of bottom sealing concrete falls, slurry can be discharged from the guide pipe, and the lower opening of the guide pipe is embedded into the concrete to be not less than 1m and not more than 3m; the underwater concrete pouring is ensured to be continuously carried out, the buried depth of the guide pipe in the concrete is controlled to be 2-6 m in the pouring process, and the pouring top surface of the underwater concrete is controlled according to the height 1m higher than the design height of the pile top, so that the quality of the pile top concrete is ensured;
removing the guide pipe and the steel casing: after the underwater concrete pouring is finished, the residual guide pipe and the steel casing are slowly pulled out by a crane for recycling.
Referring to fig. 1 and 2, the pile casing butt-joint device 1 comprises a frame 2, an upper clamping mechanism 3, a lower clamping mechanism 4, a driving mechanism 5 and a welding mechanism 6; it should be noted that, in this embodiment, the frame 2 includes a base, four support columns and a top plate, a lower hole body is disposed on the base between the four support columns, and the lower hole body is mainly used for the casing to pass through and be inserted below the ground; an upper hole body is arranged on the top plate, the upper hole body is opposite to the lower hole body in the vertical direction, and the upper hole body is used for another pile casing to pass through; the driving mechanism 5 is installed on a top seat of the frame 2, the upper clamping mechanism 3 and the lower clamping mechanism 4 are both installed on the driving mechanism 5, the upper clamping mechanism 3 and the lower clamping mechanism 4 are used for respectively clamping one pile casing, and the driving mechanism 5 is used for simultaneously driving the upper clamping mechanism 3 and the lower clamping mechanism 4 to respectively clamp the two pile casings and enable the two clamped pile casings to be opposite; the welding mechanism 6 is arranged between the upper clamping mechanism 3 and the lower clamping mechanism 4, and the welding mechanism 6 is used for welding two opposite protective cylinders.
When two protect a section of thick bamboo and dock, through last fixture 3 and fixture 4 centre gripping one section respectively protect a section of thick bamboo down, then let fixture 3 and fixture 4 down all press from both sides two sections of protecting a section of thick bamboos respectively tightly through actuating mechanism 5, make two protect a state that is in coaxial line and butt joint, and let the butt joint department that two protect a section of thick bamboo be in fixture 3 and down between fixture 4, carry out circumference welding through welding mechanism 6 to the butt joint department that two protect a section of thick bamboo after that, thereby let two protect a section of thick bamboo and directly become a longer section of thick bamboo, and then make things convenient for the darker stake hole of adaptation.
With reference to fig. 1 and 2, the driving mechanism 5 includes a rotating motor 51, a bidirectional threaded rod 52, a moving cylinder 53 and a connecting bracket 54; the rotating motor 51 is arranged on the top seat of the frame 2, and the bidirectional threaded rod 52 is coaxially arranged on the output shaft of the rotating motor 51; the inner wall of the moving cylinder 53 is provided with a thread which is matched with the bidirectional threaded rod 52; the bidirectional threaded rod 52 is formed by coaxially connecting a forward-rotation threaded column 521 and a reverse-rotation threaded column 522, the forward-rotation threaded column 521 and the reverse-rotation threaded column 522 are respectively in threaded sleeve with a moving cylinder 53, the connecting support 54 is arranged on the moving cylinder 53, and the upper clamping mechanism 3 and the lower clamping mechanism 4 are arranged on the connecting support 54; the rack 2 is also provided with a limiting guide assembly 7, the limiting guide assembly 7 is used for enabling the moving cylinder 53 to move along the length direction of the bidirectional threaded rod 52, the limiting guide assembly 7 comprises a guide rail 71, the guide rail 71 is installed on the rack 2, and the length direction of the guide rail 71 is consistent with the length direction of the bidirectional threaded rod 52; a limiting groove 711 is formed in the guide rail 71 along the length direction of the guide rail 71, a limiting block 531 is arranged on the movable cylinder 53, and the limiting block 531 is in sliding fit with the limiting groove 711; it is noted that the components of the upper clamping mechanism 3 and the lower clamping mechanism 4 are distributed on the two connecting brackets 54, that is, when the two connecting brackets 54 are close to each other, the upper clamping mechanism 3 and the lower clamping mechanism 4 are in a clamping state; when the two connecting brackets 54 are away from each other, the upper clamping mechanism 3 and the lower clamping mechanism 4 are in a released state.
Referring to fig. 1 and 2, the upper clamping mechanism 3 includes a first upper clamping plate 31 and a second upper clamping plate 32, the first upper clamping plate 31 and the second upper clamping plate 32 are respectively connected with the connecting bracket 54 through an upper cross rod, and the plate surfaces of the first upper clamping plate 31 and the second upper clamping plate 32 are opposite; the lower clamping mechanism 4 comprises a first lower clamping plate 41 and a second lower clamping plate 42, the first lower clamping plate 41 and the second lower clamping plate 42 are respectively connected with the connecting bracket 54 through a lower cross rod, and the plate surfaces of the first lower clamping plate 41 and the second lower clamping plate 42 are opposite; the upper clamping plate I31 and the lower clamping plate I41 are level, and the lower clamping plate I41 and the lower clamping plate II 42 are level; that is, when the two connecting brackets 54 move, the distance between the first upper plate 31 and the second upper plate 32 is the same as the distance between the first lower plate 41 and the second lower plate 42.
The rotating motor 51 is started, so that the output shaft of the rotating motor 51 rotates to drive the bidirectional threaded rod 52 to rotate, and the two moving cylinders 53 are respectively sleeved on the positive-rotation threaded column 521 and the negative-rotation threaded column 522 in a threaded manner, and after the limiting blocks 531 on the moving cylinders 53 are inserted into the limiting grooves 711, the moving cylinders 53 are limited to rotate in the circumferential direction; at this time, the rotation of the bidirectional threaded rod 52 directly drives the two moving cylinders 53 to approach or move away from each other; when the two movable cylinders 53 approach each other, the two connecting brackets 54 also approach each other, so that the upper clamp plate 31 and the upper clamp plate 32 approach each other, and the lower clamp plate 41 and the lower clamp plate 42 approach each other, so that the two protective cylinders are clamped simultaneously; and the upper clamping plate I31 and the lower clamping plate I41 are kept flat, and the lower clamping plate I41 and the lower clamping plate II 42 are kept flat, so that the two protective cylinders are in a state of being opposite to each other, and the connection stability of the two protective cylinders is ensured. It should be noted that, in order to make the casing clamped more stably, the upper clamp plate 31, the upper clamp plate 32, the lower clamp plate 41 and the lower clamp plate 42 are all arc plates fitted with the side wall of the casing.
Referring to fig. 2 and 3, the welding mechanism 6 includes an electric welding assembly 8 and an adjusting assembly 9, the adjusting assembly 9 is mounted on the connecting bracket 54, and the electric welding assembly 8 is mounted on the adjusting assembly 9; the electric welding assembly 8 is used for welding the butt joint of the two protection cylinders, and the adjusting assembly 9 is used for adaptively adjusting the position of the electric welding assembly 8 so as to enable the electric welding assembly 8 to be aligned to the butt joint of the two protection cylinders. After two protect a butt joint, directly adjust the position of welding subassembly 8 through adjusting part 9 for welding subassembly 8 can aim at the butt joint department of two protecting a, thereby conveniently welds, adaptability during the promotion welding.
Referring to fig. 2 and 3, the electric welding assembly 8 includes an electric welding gun 81, a nozzle of the electric welding gun 81 facing the side of the protective sleeve; the adjusting assembly 9 comprises an adjusting plate 91, a sleeve 92, a straight pipe 93, a sliding rod 94, a spring 95, a transmission box 96, a gear 97, a rack 98, a connecting rod 99, a transmission rod 901 and a dial 902; the adjusting plate 91 is installed on the connecting bracket 54, a sliding groove 911 is vertically formed in the adjusting plate 91, and the length direction of the sliding groove 911 is consistent with the length direction of the casing; the sleeve 92 is sleeved on the welding gun 81, and the straight pipes 93 are respectively arranged on two sides of the sleeve 92; the sliding rod 94 is inserted on the straight pipe 93 in a sliding mode, the spring 95 is installed in the straight pipe 93, and the spring 95 enables the sliding rod 94 to always have the tendency of moving to the side far away from the straight pipe 93; the straight tube 93 is hollow and has an open end, one end of the spring 95 is connected with the inner end wall of the straight tube 93, and the other end is connected with the end wall of the sliding rod 94 in the straight tube 93; an anti-falling flange is arranged at one end of the sliding rod 94 positioned in the straight pipe 93, a circle of anti-falling convex edge is arranged around the opening of the straight pipe 93, and the anti-falling flange and the anti-falling convex edge are in a mutually restricted state in the length direction of the sliding rod 94;
as shown in fig. 2 and 3, two inner walls of the sliding groove 911 are both provided with an abutting groove 9111, the length direction of each of the two abutting grooves 9111 is the same as the length direction of the sliding groove 911, and the rod end of the sliding rod 94 is opposite to the inner wall of the abutting groove 9111; the transmission box 96 is installed at one end of the electric welding gun 81, the transmission rod 901 is rotatably arranged on the transmission box 96 in a penetrating mode, the length direction of the transmission rod 901 is consistent with the length direction of the sliding groove 911, and one end of the transmission rod 901 extends into the transmission box 96; the gear 97 is coaxially installed at one end of the transmission rod 901, which is located in the transmission box 96, the racks 98 are respectively arranged on the transmission box 96 in a sliding manner at two sides of the gear 97, and one part of each of the two racks 98, which is located in the transmission box 96, is meshed with the gear 97, i.e. as long as the gear 97 rotates, the two racks 98 can move in the direction away from or close to each other certainly; a connecting rod 99 is arranged on the sliding rod 94, and one end of the rack 98 far away from the transmission box 96 is connected with the connecting rod 99; a dial 902 is coaxially mounted on the end of the transmission rod 901 remote from the transmission case 96.
When the dial 902 is not operated, the sliding rods 94 are pressed by the spring 95 to move in a direction away from the straight tube 93 and close to the abutting groove 9111 under the action of the elastic force of the spring 95, so that the rod ends of the two sliding rods 94 are respectively pressed against the inner side wall of the abutting groove 9111, and the electric welding gun 81 is tightly pressed against between the two abutting grooves 9111 and is not easy to move autonomously; when the head of the electric welding gun 81 is not aligned with the joint of the two protection sleeves, the dial 902 is rotated first, so that the dial 902 drives the gear 97 to rotate, and the two racks 98 move towards the direction close to each other, at this time, because the racks 98 are connected with the sliding rods 94 through the connecting rods 99, when the racks 98 move towards the transmission box 96 side, the two sliding rods 94 are pulled to move towards the straight pipe 93 at the same time, the end parts of the sliding rods 94 do not abut against the abutting grooves 9111 any more, at this time, the electric welding gun 81 can be operated to slide up and down in the length direction of the sliding grooves 911, and the position of the electric welding gun 81 is adjusted so that the mouth of the electric welding gun 81 is aligned with the abutting joint of the two protection sleeves; after the dial 902 is released, the spring 95 enables the sliding rods 94 to move in the direction away from the straight pipe 93 again under the action of the elastic force of the spring 95 and finally abut against the inner side wall of the abutting groove 9111, and after the two sliding rods 94 abut against the inner side wall of the abutting groove 9111, the electric welding gun 81 can be limited at the current position, so that the effects of fixing the position of the electric welding gun 81 and adjusting the position of the electric welding gun 81 are achieved conveniently.
Referring to fig. 2 and 4, the connecting brackets 54 are provided with semicircular arc-shaped rails 10, when the upper clamping mechanism 3 and the lower clamping mechanism 4 both clamp the pile casings and enable the two pile casings to be in butt joint, the semicircular arc-shaped rails 10 on the two connecting brackets 54 form a complete circular rail, and the adjusting plate 91 is provided with a roller 913 in sliding fit with the semicircular arc-shaped rails 10; in this embodiment, the inner sidewall of the semicircular arc rail 10 has a rolling groove along the radian of the semicircular arc rail 10 itself, and the upper and lower groove walls of the rolling groove have deep grooves, i.e. the roller 913 is located in the rolling groove but the upper and lower wheel surfaces of the roller 913 are located in the deep grooves respectively, so that the roller 913 is stably located in the rolling groove and is not easy to disengage.
When last fixture 3 and lower fixture 4 all held when protecting a section of thick bamboo, a circular track also can be constituteed to two semi-circular arc track 10 at this moment, and because regulating plate 91 passes through gyro wheel 913 and semi-circular arc track 10 sliding fit, consequently can let electric welding gun 81 remove at will on the circumferential direction who protects a section of thick bamboo, and then conveniently weld the butt joint department of two protecting a section of thick bamboos.
The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. Therefore, the method comprises the following steps: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The construction method of the large-diameter overlong cast-in-place pile is characterized by comprising the following steps of:
construction preparation: before the construction of the pile foundation, the condition of the buried pipeline is firstly detected, then the construction site is leveled, and the pile is compacted; for softer ground, soft soil is replaced, road base plates are laid at the operation position of the drilling machine after being compacted, and smooth slope surfaces need to be rolled and trimmed between a construction site and a sidewalk, so that the drilling machine and construction vehicles can smoothly enter and exit from the construction sidewalk;
embedding a steel casing: adopting mechanical excavation to bury the pile casings, firstly excavating soil within the burying depth range of the pile casings at hole sites by using a rotary drilling bit, and then directly pressing the pile casings into the soil after hoisting the pile casings in place by using the rotary drilling bit; when the length of the pile casing is smaller than the depth of the hole, the pile casing is butted on site through a pile casing butting device (1), and if the length of the butted pile casing is larger than the depth of the hole, one section of the pile casing higher than the hole is cut off;
a drilling machine positioning step: before the drilling machine is in place, a surveying worker needs to retest the pile position without errors and then reports to a supervision engineer for rechecking, the diameter of a drill bit, the gradient of a drill rod, a base and the top end are checked to ensure stability, and the position deviation of the center of the drill bit and the center of a drill hole is controlled within the range of 2 cm;
drilling: according to project geological conditions, a rotary drilling rig and a circulating drilling rig are selected for pile foundation construction, communicated elevation is measured before drilling, actual hole depth is calculated, a static mud retaining wall is adopted in the drilling process, and different drill bits, drilling pressures, drilling speeds and proper mud proportions are selected for different geological layers according to design geological and hydrological data; during the hole opening construction, the drilling is slowly advanced under light pressure, the rotating speed of a drill bit is not more than 10 revolutions per minute, normal drilling can be gradually accelerated after drill rods completely enter holes, slow drilling is slowly carried out at a low rotating speed in loose and easily collapsed strata such as a sand layer, the specific gravity and the viscosity of slurry are increased, and the hole sweeping times are increased when the stratum which is easily reduced in diameter is drilled; continuously performing drilling operation in shifts, constantly paying attention to stratum changes, timely fishing sampling slag for storage, checking geological conditions, and filling drilling construction records; under normal conditions, taking sample slag once according to 2m, and adding once when geology changes; when the geology is not accordant with the design, the geology is carried out once every 0.3 to 0.5 m;
a pore-forming inspection step: when the drilling depth meets the design requirement, checking hole position, hole diameter, hole depth, inclination and the like;
hole cleaning: cleaning the hole by adopting a slurry changing method, injecting the treated slurry into the hole, and changing the slurry containing suspended drilling slag in the hole;
manufacturing and installing a reinforcement cage: pile foundation reinforcement cages are manufactured in a reinforcement field in a centralized manner, 4 positioning lug reinforcements are uniformly distributed on the reinforcement cages every 2m along the periphery of a pile body, and pile head reinforcements extending into a bearing platform part are wrapped by pearl cotton sleeves so as to facilitate pile head chiseling in the later period; the steel reinforcement cage is installed by adopting an automobile crane, and the steel reinforcement cage is lifted by the carrying pole beam and is gradually lowered;
a conduit installation step: after the guide pipe is assembled, the axis deviation does not exceed 0.5% of the drilling depth and is not more than 10cm, and the test pressure is 1.5 times of the hydrostatic pressure of the hole bottom; when the guide pipe is hoisted into the hole, the rubber ring or the rubber cushion is placed rightly and tightly to ensure good sealing;
and (3) secondary hole cleaning: checking the thickness of the sediments again before pouring the underwater concrete, and performing secondary hole cleaning by using the guide pipe when the thickness of the sediments of the friction pile is more than 20cm or the thickness of the columnar sediments is more than 5 cm;
pouring underwater concrete: the quantity of the first batch of bottom sealing concrete is controlled, certain impact energy is generated when the first batch of bottom sealing concrete falls, slurry can be discharged from the guide pipe, and the lower opening of the guide pipe is embedded into the concrete to be not less than 1m and not more than 3m; the underwater concrete pouring is ensured to be continuously carried out, the buried depth of the guide pipe in the concrete is controlled to be 2-6 m in the pouring process, and the pouring top surface of the underwater concrete is controlled according to the height 1m higher than the design height of the pile top, so that the quality of the pile top concrete is ensured;
removing the guide pipe and the steel casing: after the underwater concrete pouring is finished, the residual guide pipe and the steel casing are slowly pulled out by a crane for recycling.
2. The construction method of the large-diameter and ultra-long cast-in-place pile according to claim 1, wherein the pile casing butt joint device (1) comprises a frame (2), an upper clamping mechanism (3), a lower clamping mechanism (4), a driving mechanism (5) and a welding mechanism (6); the device comprises a rack (2), a driving mechanism (5), an upper clamping mechanism (3), a lower clamping mechanism (4), a driving mechanism (5), an upper clamping mechanism (3) and a lower clamping mechanism (4), wherein the upper clamping mechanism (3) and the lower clamping mechanism (4) are arranged on the driving mechanism (5) respectively and are used for clamping a protection cylinder respectively, and the driving mechanism (5) is used for simultaneously driving the upper clamping mechanism (3) and the lower clamping mechanism (4) to respectively clamp the two protection cylinders and enable the two clamped protection cylinders to be opposite to each other; the welding mechanism (6) is arranged between the upper clamping mechanism (3) and the lower clamping mechanism (4), and the welding mechanism (6) is used for welding two opposite protective cylinders.
3. The construction method of a large-diameter overlong cast-in-place pile according to claim 2, wherein the driving mechanism (5) comprises a rotating motor (51), a bidirectional threaded rod (52), a moving cylinder (53) and a connecting bracket (54); the rotating motor (51) is installed on the rack (2), and the bidirectional threaded rod (52) is coaxially installed on an output shaft of the rotating motor (51); the inner wall of the moving cylinder (53) is provided with threads matched with the bidirectional threaded rod (52); the bidirectional threaded rod (52) is formed by coaxially connecting a forward-rotation threaded column (521) and a reverse-rotation threaded column (522), the forward-rotation threaded column (521) and the reverse-rotation threaded column (522) are respectively sleeved with the moving cylinder (53) in a threaded manner, the connecting bracket (54) is arranged on the moving cylinder (53), and the upper clamping mechanism (3) and the lower clamping mechanism (4) are arranged on the connecting bracket (54); the machine frame (2) is further provided with a limiting guide assembly (7), and the limiting guide assembly (7) is used for enabling the moving cylinder (53) to move along the length direction of the bidirectional threaded rod (52).
4. The construction method of the large-diameter and ultra-long cast-in-place pile as claimed in claim 3, wherein the upper clamping mechanism (3) comprises a first upper clamping plate (31) and a second upper clamping plate (32), the first upper clamping plate (31) and the second upper clamping plate (32) are respectively connected with the connecting bracket (54) through an upper cross rod, and the first upper clamping plate (31) is opposite to the plate surface of the second upper clamping plate (32); the lower clamping mechanism (4) comprises a first lower clamping plate (41) and a second lower clamping plate (42), the first lower clamping plate (41) and the second lower clamping plate (42) are respectively connected with the connecting bracket (54) through a lower cross rod, and the surfaces of the first lower clamping plate (41) and the second lower clamping plate (42) are opposite; the first upper clamping plate (31) is flush with the first lower clamping plate (41), and the first lower clamping plate (41) is flush with the second lower clamping plate (42).
5. The construction method of the large-diameter overlong cast-in-place pile as claimed in claim 4, wherein the first upper clamping plate (31), the second upper clamping plate (32), the first lower clamping plate (41) and the second lower clamping plate (42) are arc-shaped plates matched with the side wall of the pile casing.
6. The construction method of the large-diameter and ultra-long cast-in-place pile according to claim 3, wherein the limiting guide assembly (7) comprises a guide rail (71), the guide rail (71) is installed on the frame (2), the length direction of the guide rail (71) is consistent with that of the bidirectional threaded rod (52), a limiting groove (711) is formed in the guide rail (71) along the length direction of the guide rail (71), a limiting block (531) is arranged on the movable barrel (53), and the limiting block (531) is in sliding fit with the limiting groove (711).
7. A large-diameter overlength cast-in-place pile construction method according to claim 3, wherein the welding mechanism (6) comprises an electric welding assembly (8) and an adjusting assembly (9), the adjusting assembly (9) is mounted on the connecting bracket (54), and the electric welding assembly (8) is mounted on the adjusting assembly (9); electric welding subassembly (8) are used for welding the butt joint department of two protecting sections, thereby adjusting part (9) are used for adaptability adjustment to electric welding subassembly (8) the position lets electric welding subassembly (8) can aim at the butt joint department of two protecting sections.
8. The large-diameter overlong cast-in-place pile construction method according to claim 7, wherein the electric welding assembly (8) comprises an electric welding gun (81), and a nozzle of the electric welding gun (81) faces to a side of the sheath cylinder; the adjusting component (9) comprises an adjusting plate (91), a sleeve (92), a straight pipe (93), a sliding rod (94), a spring (95), a transmission box (96), a gear (97), a rack (98), a connecting rod (99), a transmission rod (901) and a dial (902); the adjusting plate (91) is installed on the connecting support (54), a sliding groove (911) is vertically formed in the adjusting plate (91), and the length direction of the sliding groove (911) is consistent with the length direction of the casing; the sleeve (92) is sleeved on the electric welding gun (81), one straight pipe (93) is arranged on each of two sides of the sleeve (92), the sliding rod (94) is inserted into the straight pipe (93) in a sliding mode, the spring (95) is installed in the straight pipe (93), and the sliding rod (94) always tends to move towards the side far away from the straight pipe (93) due to the spring (95); abutting grooves (9111) are formed in the two inner walls of the sliding groove (911) along the length direction of the sliding groove (911), and the sliding rod (94) is opposite to the abutting grooves (9111); the transmission box (96) is installed at one end of the electric welding gun (81), the transmission rod (901) is rotatably arranged on the transmission box (96) in a penetrating mode, one end of the transmission rod extends into the transmission box (96), the gear (97) is coaxially installed at one end, located in the transmission box (96), of the transmission rod (901), one rack (98) is arranged on the transmission box (96) and located on two sides of the gear (97) in a sliding mode, and one part, located in the transmission box (96), of the two racks (98) is meshed with the gear (97); the connecting rod (99) is arranged on the sliding rod (94), and one end, far away from the transmission box (96), of the rack (98) is connected with the connecting rod (99); the dial (902) is coaxially arranged at one end of the transmission rod (901) far away from the transmission box (96).
9. The construction method of the large-diameter and ultra-long cast-in-place pile as claimed in claim 8, wherein the connecting bracket (54) is provided with a semicircular arc-shaped track (10), when the upper clamping mechanism (3) and the lower clamping mechanism (4) clamp the pile casing and enable the two pile casings to be butted, the semicircular arc-shaped tracks (10) on the two connecting brackets (54) form a complete circular track, and the adjusting plate (91) is provided with a roller (913) which is in sliding fit with the semicircular arc-shaped track (10).
10. The large-diameter overlength bored concrete pile construction method according to claim 8, wherein said adjusting plate (91) is provided with a grip handle (912).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310019288.6A CN115874609A (en) | 2023-01-06 | 2023-01-06 | Construction method of large-diameter overlong cast-in-place pile |
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| CN202310019288.6A CN115874609A (en) | 2023-01-06 | 2023-01-06 | Construction method of large-diameter overlong cast-in-place pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117802990A (en) * | 2024-03-01 | 2024-04-02 | 山东天元绿色建筑科技有限公司 | Building conduit concrete pouring auxiliary equipment and pouring method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117802990A (en) * | 2024-03-01 | 2024-04-02 | 山东天元绿色建筑科技有限公司 | Building conduit concrete pouring auxiliary equipment and pouring method |
| CN117802990B (en) * | 2024-03-01 | 2024-05-28 | 山东天元绿色建筑科技有限公司 | Building conduit concrete pouring auxiliary equipment and pouring method |
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