CN210737541U - Positioning device for lowering protective cylinder of underwater cast-in-place pile - Google Patents
Positioning device for lowering protective cylinder of underwater cast-in-place pile Download PDFInfo
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- CN210737541U CN210737541U CN201920952944.7U CN201920952944U CN210737541U CN 210737541 U CN210737541 U CN 210737541U CN 201920952944 U CN201920952944 U CN 201920952944U CN 210737541 U CN210737541 U CN 210737541U
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Abstract
The embodiment of the utility model discloses a positioner that is used for aquatic bored concrete pile to protect a section of thick bamboo to transfer relates to bored concrete pile construction technical field, can sink to protect a section of thick bamboo and play the guiding orientation effect. The method comprises the following steps: the anti-collision device comprises a vertical telescopic beam, a counter-force seat and a first guide frame, wherein the counter-force seat is arranged at the top of the vertical telescopic beam, the first guide frame is connected with a profile steel copying pad, the profile steel copying pad is welded with the first guide frame and the counter-force seat respectively, and a guide through hole structure consistent with the outline of a protective cylinder is arranged on the first guide frame and used for guiding and positioning the protective cylinder. The utility model is suitable for an in the construction of deep water area bridge.
Description
Technical Field
The utility model relates to a bored concrete pile construction technical field especially relates to a positioner that is used for aquatic bored concrete pile to protect a section of thick bamboo to transfer.
Background
Cast-in-situ bored piles are used as foundation supports for buildings such as bridges and become an important part in the construction of high-speed railways and the like.
With the construction of bridges across the river and the like, the construction of underwater cast-in-place piles becomes a key point of research. In the cast-in-situ bored pile construction process, the pile casing can play roles of fixing, protecting, guiding drilling and the like in the cast-in-situ bored pile construction, and the requirement on the downward position is relatively high.
Therefore, a positioning device which can be used for lowering the pile casing of the underwater cast-in-place pile is needed to play a role in guiding and positioning the sinking of the pile casing.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a positioner that is used for aquatic bored concrete pile to protect a section of thick bamboo to transfer can sink to protect a section of thick bamboo and play guiding orientation effect.
In order to achieve the above object, the embodiments of the present invention adopt the following technical solutions:
on the one hand, the embodiment of the utility model provides a positioner that is used for aquatic bored concrete pile to protect a section of thick bamboo to transfer, include: the method comprises the following steps: the anti-collision device comprises a vertical telescopic beam, a counter-force seat and a first guide frame, wherein the counter-force seat is arranged at the top of the vertical telescopic beam, the first guide frame is connected with a profile steel copying pad, the profile steel copying pad is welded with the first guide frame and the counter-force seat respectively, and a guide through hole structure consistent with the outline of a protective cylinder is arranged on the first guide frame and used for guiding and positioning the protective cylinder.
Preferably, the first guiding frame comprises a first guiding and positioning frame, and a first guiding wheel assembly and a second guiding wheel assembly which are arranged on the first guiding and positioning frame and are used for hanging the plumb bob, and the first guiding wheel assembly 12 and the second guiding wheel assembly 13 are symmetrically arranged about the central point;
the guide through hole structure is an annular guide hole, and the annular guide hole is arranged in the middle of the first guide positioning frame.
Preferably, the device further comprises a second guide frame arranged at a corresponding position below the first guide frame, the second guide frame comprises a second guide positioning frame, a third guide wheel assembly and a fourth guide wheel assembly, the third guide wheel assembly and the fourth guide wheel assembly are arranged on the second guide positioning frame, the second guide positioning frame is welded on a connecting system of the drilling platform through a base plate, or the second guide positioning frame is connected to the lower end of the vertical telescopic beam;
the middle of the second guiding and positioning frame is provided with the guiding through hole structure, and the guiding through hole structure on the first guiding frame and the guiding through hole structure on the second guiding frame are coaxially arranged.
Preferably, the height of the welding seam between the backing plate and the connecting system is 8 mm.
Preferably, the vertical telescopic beam is a hydraulic shear fork telescopic structure beam.
The embodiment of the utility model provides a positioner that is used for aquatic bored concrete pile to protect a section of thick bamboo to transfer, include: vertical flexible roof beam, counter-force seat and first leading truck, the counter-force seat is located vertical flexible roof beam top, first leading truck passes through the shaped steel and shovels the pad connection, the shaped steel shovels the pad and welds with first leading truck and counter-force seat respectively, be equipped with on the first leading truck with protect a direction through-hole structure that the outline is unanimous, can connect on drilling platform through vertical flexible roof beam when using, because be equipped with on the first leading truck with protect a direction through-hole structure that the outline is unanimous, when protecting a section of thick bamboo below, can sink to protect a section of thick bamboo and put the effect that plays guiding orientation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an application of the positioning device for lowering the casing of the underwater cast-in-place pile in the embodiment;
FIG. 2 is a schematic view of an application structure of the lower guiding frame according to the present embodiment;
FIG. 3 is a schematic structural diagram of an embodiment of the slurry circulation system of the present embodiment;
fig. 4 is a schematic view of the arrangement structure of the concrete pouring platform in this embodiment.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model provides a positioner that is used for aquatic bored concrete pile to protect a section of thick bamboo to transfer can be applicable to the bored concrete pile construction in the deep waters in the river. Thereby being applicable to the construction engineering of the bridge in the deep water area.
Fig. 1 is a schematic view of an application structure of a positioning device for lowering a casing of a cast-in-place pile in water according to an embodiment of the present invention; referring to fig. 1, the apparatus comprises: the steel section bar protection device comprises a vertical telescopic beam 1, a counter-force seat 4 and a first guide frame 3, wherein the counter-force seat is arranged at the top of the vertical telescopic beam, the first guide frame is connected with a section bar copying pad through the section bar, the section bar copying pad is respectively welded with the first guide frame and the counter-force seat, a guide through hole structure 31 which is consistent with the outline of a protection cylinder 2 is arranged on the first guide frame, the protection cylinder is placed along the guide through hole structure 31, and the protection cylinder is guided and positioned in the placing process.
The embodiment of the utility model provides a positioner that is used for aquatic bored concrete pile to protect a section of thick bamboo to transfer, include: vertical flexible roof beam, counter-force seat and first leading truck, the counter-force seat is located vertical flexible roof beam top, first leading truck passes through the shaped steel and shovels the pad connection, the shaped steel shovels the pad and welds with first leading truck and counter-force seat respectively, be equipped with on the first leading truck with protect a direction through-hole structure that the outline is unanimous, can connect on drilling platform through vertical flexible roof beam when using, because be equipped with on the first leading truck with protect a direction through-hole structure that the outline is unanimous, when protecting a section of thick bamboo below, can sink to protect a section of thick bamboo and put the effect that plays guiding orientation.
Specifically, the vertical telescopic beam is a hydraulic shear fork telescopic structure beam. Therefore, the height can be adjusted according to the requirement, and the bearing performance is good.
Referring to fig. 1, in an embodiment of the present invention, the first guiding frame includes a first guiding and positioning frame 11, and a first guiding wheel assembly 12 and a second guiding wheel assembly 13 disposed on the first guiding and positioning frame 11 for hanging the plumb bob, and the first guiding wheel assembly 12 and the second guiding wheel assembly 13 are symmetrically disposed about the central point; the guiding through hole structure is an annular guiding hole, the annular guiding hole is formed in the middle of the first guiding and positioning frame 11, the protective barrel is placed along the annular guiding hole, and guiding and positioning are conducted on the protective barrel in the placing process.
Referring to fig. 2, in another embodiment of the present invention, the device further includes a second guiding frame disposed below the first guiding frame at a corresponding position, the second guiding frame includes a second guiding and positioning frame 14 and a third guiding wheel assembly 15 and a fourth guiding wheel assembly 16 disposed on the second guiding and positioning frame 14, the second guiding and positioning frame is welded on the connection system 6 of the drilling platform through a pad 17, or the second guiding and positioning frame is connected to the lower end of the vertical telescopic beam (not shown in the figure).
The middle of the second guiding and positioning frame is provided with the guiding through hole structure, and the guiding through hole structure on the first guiding frame and the guiding through hole structure on the second guiding frame are coaxially arranged.
Specifically, the height of the welding seam between the backing plate and the connecting system is 8 mm.
The first guide wheel and the second guide wheel can be connected with the first guide positioning frame by using 5.6-grade M27 common bolts.
The third guide wheel assembly 15 and the fourth guide wheel assembly 16 are also connected with the second guide positioning frame by using 5.6-grade M27 common bolts.
The embodiment also provides a construction method of the underwater large-diameter (more than 3 meters) cast-in-place pile, which comprises the following steps: measuring and lofting; the method specifically comprises the following steps: building a drilling platform, determining a pile position by using a total station coordinate lofting method, and setting a leveling point; and measuring the central point of the pile position by using a total station, arranging four-point guide piles, and measuring the elevation of the leveling point by using a triangular elevation method.
Embedding a protective cylinder; the method specifically comprises the following steps: based on the central point of the pile position and the guide pile, a guide frame is arranged on the drilling platform and used for guiding and positioning the pile casing.
During specific construction, the lower guide frame can be manufactured in a larger number, for example, 45 sleeves, due to more than one pile position. The upper guide frame can be made into a small number and can be recycled, for example, 6 sets.
According to the hoisting construction sequence when the steel casing is sunk, the steel casing is loaded and transported to the position near the drilling platform layer by layer; this can reduce secondary dumping. The cross supports are arranged at the two ends and the middle part in each section of steel casing to ensure that the steel casing is not deformed in the manufacturing, transporting and hoisting processes; and lifting rings are arranged at the positions of the steel pile casings, which are 0.5-0.8 m away from the two ends, so that the steel pile casings can be lifted conveniently.
The crane ship horizontally lifts the steel casing from the transport ship and places the steel casing on the drilling platform; the shipping steel protective cylinder is fixed by adopting a transportation jig frame, is provided with a skid and is fastened by a steel wire rope to prevent rolling; and the carrier is strictly inspected and necessary reinforcement measures are taken. The length of the steel pile casing can be determined according to the water depth, geology, scouring condition and drilling requirement at the pile position, the inner diameter of the steel pile casing is 35cm larger than the pile diameter, for example, when the pile diameter is 3m, the inner diameter of the steel pile casing is 3.35 m; the steel casing is made by rolling a steel plate with the thickness of 24mm, and a single steel casing weighs about 88 tons. In one embodiment, the length of the bottom section of the steel casing is 18m, the length of the middle section of the steel casing is 18m, and the length of the top section of the steel casing is 8 m; in another combination, the length of the bottom section of the steel casing is 16 or 18m, the length of the middle section is 16m, and the length of the top section is 12m or 10 m; the design elevation of the bottom of the steel casing is-19.16 m so as to enter a stable fine gravel soil layer and ensure the stability of a pile foundation.
The utility model discloses an in the embodiment, because the steel protects a diameter big, the degree of depth of burying is long, for guaranteeing to insert and beat the process steel and protect a top mouth and a bottom mouth not impaired destruction, respectively protect a top mouth 50cm high range paste weld 10mm thick steel sheet, protect a bottom mouth 100cm range paste weld 20mm thick steel sheet at the steel and strengthen, like this, the smooth of assurance major diameter bored concrete pile construction that can be better goes on.
The 200t floating crane is matched with 1 crawler crane or 2 crawler cranes, and the first section of steel casing is lifted and erected through the lifting rings at the two ends of the top end and the bottom; wherein the steel casing is transported to the drilling platform and is responsible for 200t of floating crane; the erection is carried out by 200t floating crane and 1 crawler crane or 2 crawler cranes; in the process of height connection and inserting driving, a 130t crawler crane, a 100t gantry crane or a 200t floating crane are used for hoisting; before hoisting and erecting or transporting, the quality, particularly the diameter, the line shape and the ovality of the steel casing are required to be checked, and a lifting lug at the top of the casing is checked.
And lifting and erecting the first section of steel pile casing to keep the bottom of the pile casing to be higher than the drilling platform by a preset distance, such as about 1.0 m. Cutting off the lower part of the cross-shaped support at the bottom of the first section of the protective cylinder; and hanging a first section of steel protecting cylinder to slowly sink into the annular guide hole of the guide frame until a lifting lug at the upper end of the first section of steel protecting cylinder touches a guide positioning frame at the top end of the annular guide hole.
In this embodiment, the pile casing is hung and is put into the stake hole and will slowly transfer, because the space between annular guiding hole and the steel casing is little, when the steel casing is put down to annular guiding hole top surface, if the position is not adjusted well, should rotate the steel casing and make it automatic entering guiding hole in, strictly forbid the high-rise impactedly drop and protect a section of thick bamboo.
Supporting the first section of steel casing at the top end of the annular guide hole through the lifting lug; and a plumb bob is vertically hung on the first guide wheel assembly and the second guide wheel assembly arranged at the tops of the guide piles or the guide frames in the 4 vertical directions so as to detect the verticality of the first section of pile casing.
And if the verticality of the first section of steel casing is detected not to be in the verticality range required by the design, adjusting the verticality of the first section of steel casing to be in the verticality range required by the design, for example, adjusting the verticality of the steel casing to be within 1/250, and continuing to be supported at the top end of the annular guide hole through the lifting lug.
The method for hoisting the first section of steel casing is repeated, and a second section of steel casing (namely the middle section of steel casing) is hoisted to be aligned to the top end of the first section of steel casing and is welded with the top end of the first section of steel casing into a whole in an alignment way;
after welding, cutting off a lifting lug and an inner cross-shaped support of a first section of protective cylinder, adjusting the verticality of the welded steel protective cylinder, and controlling the plane position and the vertical position of the steel protective cylinder by using a total station and a plumb bob so as to control the level and the verticality of the steel protective cylinder; after welding is completed, ultrasonic flaw detection of the weld is also required.
Slowly lowering the casing, inserting the casing into a riverbed stable soil layer, and supporting the casing at the top end of the annular guide hole by using a second section of lifting lug; the APE400B is lifted by the loose hook to vibrate the pile driver to drive the pile casing downwards until the top surface of the steel pile casing is 1.0m higher than the drilling platform. The APE400 twin hydraulic vibratory pile driver suspended weight was 55 tons, maximum power (738 x 2) kW, maximum excitation force 640.6 t.
Repeating the processes of lifting, inserting and piling of the second section of steel casing, aligning the top end of the second section of steel casing, welding a third section of steel casing, and inserting and beating to the preset design depth of the riverbed; and connecting the steel casing which is inserted and drilled to the preset design depth with the drilling platform.
In the embodiment, after the construction of the first pile position steel casing is completed, the steps are repeated to complete the construction of other pile position steel casings, and after the construction of each pile position steel casing is completed, the following quality requirements are met, namely the perpendicularity of the steel casing must meet the following requirements that ① meets the requirements of the construction of the bored pile, namely the perpendicularity of the bored pile does not exceed 1/250 and the deviation of the plane position of the bored pile does not exceed 50mm, the inserting and driving perpendicularity precision of the ② steel casing must not prevent the steel casing box cofferdam from descending, and mainly the mutual relation between the fixed guide ring adjustment amount of the cofferdam and the deviation of the casing.
The quality of the steel casing meets the design requirements that deviation of the outer circumference of ① is +10mm, -0mm, ovality of ② is not more than 5mm, inclination of a plane of an end part of ③ is not more than 2mm, flatness of an end part of ④ is not more than 2mm, a weld joint of ⑤ is provided, undercut depth is less than 0.5mm, height of a butt weld joint is increased by 1-3 mm, the width of the butt weld joint is covered by the butt weld joint is 3-4 mm, dislocation of the butt weld joint of ⑥ is not more than 2mm, deviation of a ⑦ joint groove is 5 degrees, pipe diameter deviation of adjacent pile positions of ⑧ is not more than 2mm, longitudinal bending rise of the ⑨ casing is not more than 1/1000 of length and not more than 10mm, quality inspection of weld joints of the ⑩ casing is carried out, ultrasonic flaw detection is carried out for 40%, polishing light circles are needed for opening of the steel casing, drilling and strictly cutting holes are needed for opening of ear plates, and various technical data of the steel casing after.
Positioning a drilling machine; driving the rotary drilling rig to a hole site to be constructed, adjusting the angle of a drill rod, aligning the center of a drill bit with the center of a hole channel surrounded by a steel casing, putting the drill bit into the hole channel surrounded by the steel casing, adjusting the horizontal and vertical parameters of a platform of the drilling rig to enable the drill rod to be vertical, and simultaneously lifting the drilling tool; in one embodiment, the rotary drilling rig is provided with 5 stations for circularly drilling a plurality of pile positions of the tower pier.
Measuring and releasing the elevation of the top of the protective cylinder, the ground and the level point of the drilling machine platform, and adjusting the deviation between the center of the drill bit and the center of the top surface of the protective cylinder within a design tolerance range; drilling to form a hole; drilling a hole by adopting a slurry protection wall; the drilling mud is PHP high-quality bentonite chemical mud with non-dispersion, low solid phase and high viscosity. The slurry is composed of raw materials such as high-quality bentonite, alkali (Na2CO3), methyl cellulose (CMC), polyacrylamide (PHP) and the like, and the water for pulping is river water nearby. The drilling holes are formed by adopting slurry to protect the wall, and the slurry plays a wall protecting role in the drilling process.
In an embodiment of the present invention, the drilling with the mud wall comprises:
20m is arranged in the steel casing3The air compressor I is used for injecting air into the protecting cylinder by utilizing the air compressor and the drill rod air bag so as to enable the stored water in the protecting cylinder to be in a continuous overturning state; and simultaneously, bentonite, sodium carbonate, cellulose and polyacrylamide are put into the casing to prepare slurry which is used as the slurry required by the drilling machine before opening the hole.
A 3.0m double-bottom double-cutting-tooth drill bit is placed into the protective cylinder to slowly drill downwards; the rotating speed of the drill bit is less than or equal to 10r/min so as to ensure that the hole position is controlled within the range of the design requirement during tunneling; after the opening of the hole, the mud preparation was carried out on a mud boat, set at 1.5m 31 stirrer.
When drilling to a position which is about 1-2 m close to the bottom opening of the steel casing, drilling by adopting a first bit pressure and a first drilling speed, and controlling the tunneling size to ensure the stability of the stratum at the bottom opening part of the casing; when the drill bit drills out a bottom opening of the protective cylinder for 2-3 m, the drilling state is recovered to a second bit pressure and a second drilling speed; wherein the second weight-on-bit is greater than the first weight-on-bit and the second rate-of-penetration is greater than the first rate-of-penetration. The first drilling pressure is 8-10 t, and the first drilling speed is 3-6 r/min; the second drilling pressure is 10-20 t, and the second drilling speed is 6-10 r/min.
In the drilling process, the slurry surface in the hole is kept higher than the bottom of the pile casing by more than 0.5m or the underground water level is kept to be 1.5-20 m; an opening is formed at a position 0.3m lower than the top of the pile casing to prevent the slurry from overflowing, and the slurry is timely supplemented after the slag is drawn out;
the verticality of the formed hole is repeatedly checked through a three-way vertical control system of a drilling machine in the drilling process so as to ensure the quality of the formed hole.
In the embodiment, as an optional embodiment, in the drilling process, the slurry surface in the hole is kept 0.5m higher than the bottom of the pile casing or the underground water level is kept 1.5-20 m; the opening is arranged at the position 0.3m lower than the top of the pile casing to prevent the slurry from overflowing, and the slurry is timely supplemented after the slag is drawn out, so that the method comprises the following steps:
detecting the height of the slurry surface in the hole in real time; when the height of the slurry surface in the hole is detected to be 0.5m lower than the bottom of the protective cylinder or the underground water level is detected to be 1.5-20 m, a slurry ship of a slurry circulating system is used for conveying slurry into the protective cylinder; when sediment in the drill hole is detected to be larger than a first threshold value, pumping mud in the drill hole to a mud separator; the slurry separator filters the slurry and conveys the filtered slurry to the slurry storage pool; and when the height of the slurry surface in the protective cylinder is detected to be 0.5m lower than the bottom of the protective cylinder or the underground water level is detected to be 1.5-20 m, the slurry in the slurry storage pool is conveyed into the protective cylinder, so that the cyclic utilization of the slurry is realized. Preferably, the first threshold is 5 cm.
Wherein, referring to fig. 3, the drilling platform is 01, and the mud circulation system comprises: a mud boat 06 on which a mud mixer and a mud pump are arranged, the mud pump being connected to the inside of the casing 07 through a first conduit 61; the mud pump is used for pumping the mud made by the mud mixer into the protective cylinder; an air compressor 8 connected to the bottom inside the casing through a second conduit 71 for discharging air to the slurry to tumble the slurry; and the slurry separator 9 and the slurry storage tank 10 are connected into the protective cylinder through a third conduit 81 and used for pumping slurry out of the protective cylinder when hole cleaning is needed, separating and filtering the slurry and then conveying the separated and filtered slurry to the slurry storage tank so as to recycle the slurry in the drilling process.
Cleaning holes and replacing pulp; and when the hole is drilled to the designed height, cleaning the hole by adopting a gas lift reverse circulation mode, and detecting the hole shape.
After the detection is qualified, a steel reinforcement cage is arranged, and a plurality of sections of guide pipes are put down; after the steel reinforcement cage and the guide pipe are placed, measuring the thickness of sediment at the bottom of the hole, if the thickness of the sediment does not exceed a first threshold value, erecting a pouring platform, pouring concrete, and determining whether to lift or pull out the guide pipe according to the pouring speed of the concrete; and when the pile elevation is poured to the designed pile elevation, stopping pouring, and finishing the construction of the cast-in-place pile.
The positioning device for lowering the pile casing of the cast-in-place pile in water provided by the embodiment of the utility model comprises a measuring lofting; building a drilling platform, determining a pile position by using a total station coordinate lofting method, and setting a leveling point; measuring the central point of the pile position by using a total station, arranging four-point guide piles, and measuring the elevation of a leveling point by using a triangular elevation method; embedding a protective cylinder; based on the central point of the pile position and the guide pile, arranging a guide frame on the drilling platform, wherein the guide frame is used for guiding and positioning the pile casing; the guide frame comprises a guide positioning frame, a first guide wheel assembly and a second guide wheel assembly, wherein the first guide wheel assembly and the second guide wheel assembly are arranged on the guide positioning frame, the first guide wheel assembly and the second guide wheel assembly are symmetrically arranged relative to the central point, and an annular guide hole is formed in the middle of the guide positioning frame; according to the hoisting construction sequence when the steel casing is sunk, the steel casing is loaded and transported to the position near the drilling platform layer by layer; cross supports are arranged at two ends and the middle part in each section of steel casing, and lifting rings are arranged at the positions of the steel casing, which are 0.5-0.8 m away from the two ends; the crane ship horizontally lifts the steel casing from the transport ship and places the steel casing on the drilling platform; the 200t floating crane is matched with 1 crawler crane or 2 crawler cranes, and the first section of steel casing is lifted and erected through the lifting rings at the two ends of the top end and the bottom; hoisting and erecting a first section of steel pile casing to keep the bottom of the pile casing higher than a drilling platform by a preset distance; cutting off the lower part of the cross-shaped support at the bottom of the first section of the protective cylinder; a first section of steel protecting cylinder is hung and slowly sunk into the annular guide hole of the guide frame until a lifting lug at the upper end of the first section of steel protecting cylinder touches a guide positioning frame at the top end of the annular guide hole; supporting the first section of steel casing at the top end of the annular guide hole through the lifting lug; a plumb bob is vertically hung on a first guide wheel assembly and a second guide wheel assembly arranged at the top of the guide pile or the guide frame so as to detect the verticality of the first section of pile casing; if the verticality of the first section of steel casing is detected to be not in the verticality range required by the design, adjusting the verticality of the first section of steel casing to be in the verticality range required by the design, and continuously supporting the first section of steel casing at the top end of the annular guide hole through the lifting lug; the method for hoisting the first section of steel casing is repeated, and the second section of steel casing is hoisted to be aligned to the top end of the first section of steel casing and is welded with the top end of the first section of steel casing into a whole; after welding, cutting off a lifting lug and an inner cross-shaped support of a first section of protective cylinder, adjusting the verticality of the welded steel protective cylinder, and controlling the plane position and the vertical position of the steel protective cylinder by using a total station and a plumb bob; slowly lowering the casing, inserting the casing into a riverbed stable soil layer, and supporting the casing at the top end of the annular guide hole by using a second section of lifting lug; the APE400B is hoisted by the loose hook to vibrate the pile driver to drive the pile casing downwards until the top surface of the steel pile casing is 1.0m higher than the drilling platform; repeating the processes of lifting, inserting and piling of the second section of steel casing, aligning the top end of the second section of steel casing, welding a third section of steel casing, and inserting and beating to the preset design depth of the riverbed; connecting the steel casing which is inserted and punched to a preset design depth with a drilling platform; positioning a drilling machine; driving the rotary drilling rig to a hole site to be constructed, adjusting the angle of a drill rod, aligning the center of a drill bit with the center of a hole channel surrounded by a steel casing, putting the drill bit into the hole channel surrounded by the steel casing, adjusting the horizontal and vertical parameters of a platform of the drilling rig to enable the drill rod to be vertical, and simultaneously lifting the drilling tool; measuring and releasing the elevation of the top of the protective cylinder, the ground and the level point of the drilling machine platform, and adjusting the deviation between the center of the drill bit and the center of the top surface of the protective cylinder within a design tolerance range; drilling to form a hole; drilling a hole by adopting a slurry protection wall; cleaning holes and replacing pulp; when the hole is drilled to the designed elevation, cleaning the hole by adopting a gas lift reverse circulation mode, and detecting the hole shape; after the detection is qualified, a steel reinforcement cage is arranged, and a plurality of sections of guide pipes are put down; after the steel reinforcement cage and the guide pipe are placed, measuring the thickness of sediment at the bottom of the hole, if the thickness of the sediment does not exceed a first threshold value, erecting a pouring platform, pouring concrete, and determining whether to lift or pull out the guide pipe according to the pouring speed of the concrete; when the pile elevation is designed, the pouring is stopped, the construction of the cast-in-place pile is completed, and the method is suitable for the construction of the cast-in-place pile in the deep water area in the river.
In another embodiment of the present invention, during drilling, the method further comprises: and taking slag in time to observe the change condition of the stratum, and adjusting drilling parameters in time according to the geological condition.
In another embodiment of the present invention, the step of placing the reinforcement cage after the detection is qualified comprises: manufacturing a reinforcement cage in a processing workshop section by adopting a jig frame long line method, wherein the reinforcement cage at least comprises a reversed V-shaped grounding reinforcement formed by welding two surfaces of an HPB300 reinforcement and a main reinforcement of a vertical structure; the segmentation preparation steel reinforcement cage includes: checking whether the end part of the reinforcing steel bar material is bent or not, and straightening if so, so that the end surface is flat and vertical to the axis of the reinforcing steel bar; sawing and cutting the reinforcing steel bar material by using a reinforcing steel bar sawing and threading machine, and rolling threads on the end part of each section of reinforcing steel bar to manufacture a main reinforcement, a stirrup and a stiffening ring of the reinforcement cage; protecting the processed steel bar screw head by using a protective cap after the processing is finished so as to prevent the threads from being collided; manufacturing a special connecting sleeve, and arranging a protective end cover at the end part of the sleeve; the thread form of the connecting sleeve is complete, and no crack is formed on the surface of the connecting sleeve; and inspecting the screw head of each section of the steel bar and the special connecting sleeve by using a thread gauge, manufacturing the qualified main steel bar, the stirrup and the stiffening ring into a multi-section steel bar cage, and numbering the steel bar cage according to the field installation sequence.
Hoisting the reinforcement cage comprises: transporting the numbered reinforcement holes and the special connecting casing boxes to the position close to the pile position; arranging protective layer cushion blocks on the outer peripheral surface of the steel reinforcement cage, wherein the protective layer cushion blocks are formed by concrete cushion blocks and are arranged at intervals of 2m along a pile body, 6 protective layer cushion blocks are arranged on each layer, each protective layer cushion block is a C40 concrete circular ring-shaped cushion block with the diameter of 14cm and the thickness of 6cm, and round steel with the diameter of 12mm penetrates through the circular ring-shaped cushion block in the radial direction and is fixed with the main reinforcement in a spot welding manner; arranging a pad beam 20 on a top panel 011 of the drilling platform, leveling the pad on site, and automatically setting limit; adopting a 130t crawler crane, a 200t floating crane or a 100t gantry crane to perform section-by-section lowering installation according to the installation sequence of the reinforcing steel bar holes; wherein, the section of reinforcement cage with the grounding reinforcement is the first section of hoisted reinforcement cage 21; after each section of reinforcement cage is completely placed, the clamping plate 22 is used for positioning the reinforcement cage, and the operator uses the connecting sleeve to butt the reinforcement cage up and down; the section from the top of the steel bar cage to the drilling platform is lengthened by adopting a steel bar hanging frame, the section from the top of the steel bar cage to the drilling platform is designed to be 23.5m, the steel bar hanging frame consists of main steel bars 22 and stiffening rings, the main steel bars are 10 phi 28mmHRB400 steel bars, the stiffening rings are phi 32mmHRB400 steel bars, every two vertical lines are arranged, and the top of each section of the steel bar hanging frame is provided with a double-layer stiffening ring and an L-shaped stiffening bar; after the steel reinforcement cage is transferred and is taken one's place, place the stiffening ring in hanger frame top on the cardboard, 10 main muscle are no longer than 5cm to corresponding cardboard position interval.
In this embodiment, specifically, making the steel reinforcement cage in sections further includes: vertically binding an ultrasonic sounding pipe on the outer peripheral surface of the steel bar to detect the quality of the cast-in-situ bored pile; the lower end of the sound measuring tube adopts a sealed shaped bottom section, the upper end of the sound measuring tube is covered with a temporary cap and screwed tightly, and no foreign matter exists in the sound measuring tube; the pipe orifice of the ultrasonic sounding pipe positioned on the uppermost section of the reinforcement cage at the mounting position is flush with the drilling platform, and the ultrasonic sounding pipes are vertically arranged in parallel and have consistent pipe orifice heights.
In another embodiment of the present invention, before the lowering the plurality of tubes, the method further comprises: carrying out a watertight pressure-bearing experiment on the conduit; the method specifically comprises the following steps: splicing the guide pipes in sequence; irrigating water into the guide pipe; sealing two ends, wherein one end is provided with a water valve and a gas transmission pipe; connecting the gas pipe with an air pressure pipeline through a pressure gauge; the air compression pipeline comprises an air compressor; starting an air compressor, conveying gas into the guide pipe, and keeping the air pressure at 1.54MPa for 15 min; checking the conduit for water leakage; if no water is leaked, the product is qualified.
Referring to fig. 4, in still another embodiment of the present invention, the cast-in-place concrete includes: calculating the first concrete pouring amount; the calculation formula is as follows:
in the formula: v is the quantity of the first concrete, and the unit is m3(ii) a H1 is the high layer needed by the concrete in the guide pipe to balance the external water (or slurry) pressure of the guide pipe when the height of the concrete surface in the hole reaches Hc, namely H1 is more than or equal to Hw r w/rc; hc is the height Hc from the concrete surface to the bottom of the hole in the well hole, which is h2+ h3, required when the first batch of concrete is poured; hw is the depth of water or slurry above the concrete surface in the hole, and 81m is taken; d is the diameter phi 3m of the hole; d is the diameter phi of the catheter 0.305 m; rc is the concrete mix capacity, which in one embodiment is 23.97kN/m3(ii) a rw is the volume weight of water or slurry in the borehole, and in one embodiment is 10.3 to 11kN/m 3; h2 is the primary embedment depth of the conduit, measured as 1.5 m; h3 is the distance from the bottom end of the conduit to the bottom of the hole, which in one embodiment is 0.3m.
Determining the size specifications of the ball drawing and hopper of the filling frame based on the filling amount; the volume of the first batch of concrete is not less than 15.43m3Using 6m3Hopper and 15.8m3Drawing the ball by the perfusion rack; the ball pulling device is arranged at the neck opening of the hopper of the perfusion rack; pouring concrete into the hopper, toLifting the pulling ball, and pouring concrete into the bottom of the drilled hole; in the process of pouring, observing the conditions of concrete falling in the guide pipe and water level rising in the hole; repeatedly measuring the height of the concrete surface, and adjusting the buried depth of the guide pipe according to the height to control the buried depth of the guide pipe to be 2-6 m; determining whether a catheter needs to be lifted or pulled out based on the burial depth; when the concrete is poured to a position within 5m from the pile top, the guide pipe is not lifted any more, and the guide pipe is pulled out once when the concrete is poured to the designed pile height.
In this embodiment, specifically, hopper neck department seals with steel deck (pull out the ball), put water proof bolt (valve) in the pipe, the steel deck passes through wire rope and crane hooklet and is connected, adopt steel pipe or reinforcing bar earlier to push up the steel deck and die tightly when concrete goes into the hopper, prevent the steel deck aversion, when filling frame concrete and the interior concrete storage of hopper are full, pull out the ball by on-the-spot commander's instruction down, the operation personnel immediately lifts out the steel deck according to the instruction, open the filling frame valve simultaneously, let the interior concrete of filling frame get into the hopper, then let the interior concrete of hopper press the air and water proof bolt to wash into the hole bottom, the water proof bolt is taken out after floating out the mud face.
In one embodiment of the present invention, during the pouring process, when the concrete in the duct is not full and contains air, the subsequent concrete is poured into the duct at a slower speed; therefore, a high-pressure air bag formed in the guide pipe can be avoided, and concrete falling is prevented from being influenced.
In an embodiment of the present invention, after the first filling pile is filled, the first filling pile is marked and recorded;
and cleaning the grouting tool, and beginning to pour the pile hole at the adjacent position until all the cast-in-place pile construction is completed. In grouting, when the top surface of poured concrete is about 1m away from the bottom of a reinforcement cage, the pouring speed of the concrete is reduced in order to prevent the reinforcement cage from floating upwards; when the concrete rises to the bottom opening of the reinforcement cage by more than 4m, the guide pipe is lifted, so that the bottom opening is higher than the bottom of the framework by more than 2m, and the normal pouring speed can be recovered.
In order to prevent the reinforcement cage from sinking, the reinforcement cage is positioned on the clamping plates of the reinforcement cage lowering device after being lowered in place, so that the 10 clamping plates are stressed at the same time, and a limiting device is arranged; and simultaneously, the deformation condition of the drilling platform at the hole position is checked to prevent the steel reinforcement cage from sinking.
The positioner that is used for aquatic bored concrete pile casing to transfer that this embodiment provided can be applicable to the bored concrete pile construction in the deep waters in the river, and can guarantee the construction quality of bored concrete pile.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A positioner that is used for a water bored concrete pile casing to transfer, its characterized in that includes: the anti-collision device comprises a vertical telescopic beam, a counter-force seat and a first guide frame, wherein the counter-force seat is arranged at the top of the vertical telescopic beam, the first guide frame is connected with a profile steel copying pad, the profile steel copying pad is welded with the first guide frame and the counter-force seat respectively, and a guide through hole structure consistent with the outline of a protective cylinder is arranged on the first guide frame.
2. The positioning device according to claim 1, wherein the first guiding frame comprises a first guiding and positioning frame, and a first guiding wheel assembly and a second guiding wheel assembly which are arranged on the first guiding and positioning frame and used for hanging the plumb bob, and the first guiding wheel assembly and the second guiding wheel assembly are symmetrically arranged about the center point of the guiding through hole structure;
the guide through hole structure is an annular guide hole, and the annular guide hole is arranged in the middle of the first guide positioning frame.
3. The positioning device according to claim 1, further comprising a second guiding frame disposed at a corresponding position below the first guiding frame, wherein the second guiding frame comprises a second guiding and positioning frame, and a third guiding wheel assembly and a fourth guiding wheel assembly disposed on the second guiding and positioning frame, the second guiding and positioning frame is welded to the connection system of the drilling platform through a pad plate, or the second guiding and positioning frame is connected to the lower end of the vertical telescopic beam;
the middle of the second guiding and positioning frame is provided with the guiding through hole structure, and the guiding through hole structure on the first guiding frame and the guiding through hole structure on the second guiding frame are coaxially arranged.
4. The positioning device according to claim 3, wherein the weld height between the shim plate and the connection system is 8 mm.
5. The positioning device of claim 1 wherein said vertically telescoping beams are hydraulic scissor telescoping structural beams.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111778970A (en) * | 2020-06-16 | 2020-10-16 | 中交二航局第四工程有限公司 | Measurement and control method for sinking of pile group steel casing of far-shore non-construction platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111778970A (en) * | 2020-06-16 | 2020-10-16 | 中交二航局第四工程有限公司 | Measurement and control method for sinking of pile group steel casing of far-shore non-construction platform |
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