CN111364464A - Construction equipment for pouring concrete into karst cave and construction method thereof - Google Patents
Construction equipment for pouring concrete into karst cave and construction method thereof Download PDFInfo
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- CN111364464A CN111364464A CN202010196935.7A CN202010196935A CN111364464A CN 111364464 A CN111364464 A CN 111364464A CN 202010196935 A CN202010196935 A CN 202010196935A CN 111364464 A CN111364464 A CN 111364464A
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- drill rod
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- karst cave
- cylinder
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/22—Rods or pipes with helical structure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
Abstract
The invention belongs to the technical field of foundation and foundation engineering, and particularly relates to construction equipment for pouring concrete into a karst cave and a construction method thereof. According to the invention, the drill rod with the protective cylinder is arranged at the bottom of the hollow spiral drill rod, the movable protective cylinder is arranged on the drill rod with the protective cylinder, when concrete is injected into the karst cave, the outer cylinder of the movable protective cylinder moves downwards under the action of gravity, and the concrete is rapidly solidified in the outer cylinder, so that the defect that the concrete is spread outwards in the traditional construction method is reduced, the loss of materials is further reduced, and meanwhile, the bearing capacity of the upper foundation of the karst cave is greatly improved.
Description
Technical Field
The invention belongs to the technical field of foundation and foundation engineering, and particularly relates to construction equipment for pouring concrete into a karst cave and a construction method thereof.
Background
The karst cave is an underground space formed by karst action in soluble rocks, and the formation of the karst cave is a result of long-term corrosion of underground water in limestone areas. China is a country with a plurality of karsts, and the karst area of China is about 1/4 of the total area of the subtropical karsts in the world.
The construction of karst (earth) caverns in geology often requires the necessary treatment to ensure adequate bearing capacity of the building foundation. At present, the main treatment mode is to fill the hole body after drilling to reduce the risk of unstable and collapse of the hole body structure, but the method often causes a great deal of material waste. Meanwhile, the existing construction method needs to be repeatedly hammered after filling, the construction equipment is complex, and the construction period is long.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides construction equipment for pouring concrete into a karst cave and a construction method thereof, which can solve the technical problems of large consumption of karst cave treatment materials, complex construction, long construction period and the like, and further improve the bearing capacity of a treated foundation.
The invention provides construction equipment for pouring concrete into a karst cave, which comprises a drilling machine, a hollow spiral drill rod, a concrete pumping vehicle and a connecting pipe, wherein the drilling machine is provided with a power head, one end of the hollow spiral drill rod and one end of the connecting pipe are respectively connected to the power head, the other end of the connecting pipe is connected with the concrete pumping vehicle, the connecting pipe, the power head and the hollow spiral drill rod are sequentially communicated, the equipment further comprises a drill rod with a protective cylinder, and the drill rod with the protective cylinder is vertically and downwards fixedly arranged at the other end of the hollow spiral drill rod.
Further, the drill rod with the protective cylinder comprises a hollow steel pipe, a helical blade, a movable protective cylinder and a drill bit, the hollow steel pipe is fixedly communicated with the hollow spiral drill rod, the helical blade is arranged on the upper portion of the hollow steel pipe, the movable protective cylinder is arranged on the lower portion of the hollow steel pipe, the drill bit is arranged at the bottom end of the hollow steel pipe, and a concrete pouring outlet is formed in the drill bit.
Furthermore, the movable protective cylinder comprises an inner cylinder, an outer cylinder, a connecting piece and a limiting mechanism, the inner cylinder is connected with the lower portion of the hollow steel pipe through a bearing, grooves which are communicated up and down are evenly formed in the outer surface of the inner cylinder along the circumference, sliding blocks are arranged in the grooves and connected with the outer cylinder through the connecting piece, and the limiting mechanism used for limiting the sliding of the sliding blocks along the grooves is further arranged in the grooves.
Furthermore, the drill bit is provided with reaming wings which are symmetrically arranged on the outer surface of the drill bit.
Further, the upper edge of the reaming wing is arc-shaped.
Further, the outside that the export was filled to the concrete is equipped with sealed lid, is equipped with the spring part between sealed inboard and the export is filled to the concrete, and under initial condition, the spring part is in tensile state.
Furthermore, a limiting mechanism is connected with the spring part, and when the sealing cover is forced to be opened, the spring part triggers the limiting mechanism to release the sliding block.
And the drill rod guide device is connected with the drilling machine, and the drill rod with the protective barrel and the hollow spiral drill rod vertically and downwards penetrate through the drill rod guide device.
Furthermore, the drill rod guiding device comprises a base, a guiding steel cylinder arranged on the base, a rubber sleeve arranged on the inner side of the guiding steel cylinder, a reinforcing rib positioned at the joint of the base and the guiding steel cylinder, and leveling oil cylinders uniformly distributed along the circumference at the lower end of the base.
Furthermore, the construction equipment is also provided with an automatic drill rod deviation rectifying device which comprises an upright post arranged on the drilling machine, a pressure sensor arranged between the rubber sleeve and the guide steel cylinder and a leveling terminal connected with the pressure sensor.
The construction equipment for pouring concrete into the karst cave has the following beneficial effects:
(1) according to the invention, the drill rod with the protective cylinder is arranged at one end of the hollow spiral drill rod close to the karst cave, the movable protective cylinder is arranged on the drill rod with the protective cylinder, when concrete is injected into the karst cave, the outer cylinder of the movable protective cylinder moves downwards under the action of gravity, the concrete falls into the outer cylinder in a concentrated manner and is solidified quickly, the defect that the concrete is spread outwards in the traditional construction method is reduced, and the loss of materials is effectively reduced.
(2) According to the invention, the drill rod guide device is arranged on the drilling machine, the drill rod guide device can be adjusted to be horizontal through the leveling oil cylinder at the lower end of the base, if the drill rod direction inclines, extrusion force is generated between the drill rod guide device and the rubber sleeve, the extrusion force distribution is measured by the pressure sensor and then transmitted to the leveling terminal, and the direction of the upright column can be adjusted in a targeted manner, so that the deviation of the hollow spiral drill rod is corrected.
(3) The reaming wing is arranged on the drill bit, the upper outer edge of the reaming wing is arc-shaped, when a hole is drilled downwards, the reaming wing is opened outwards under the action of cutting force to assist in reaming, and the diameter of the reaming is larger than that of the outer cylinder of the movable protective cylinder, so that the movable protective cylinder and the hollow spiral drill rod are lowered simultaneously; when concrete is poured, under the action of confining pressure, the reaming wings contract inwards into the outer barrel, so that the outer barrel can slide downwards under the action of gravity, and the concrete filled in the karst cave is completely limited in the outer barrel to form a concrete column with a fixed shape.
(4) According to the invention, the limiting mechanism is arranged in the groove, when the spring part is in an initial state and the sealing cover is closed, the limiting mechanism prevents the sliding block from sliding in the groove, the outer cylinder and the inner cylinder are at the same height, so that the movable protective cylinder does not interfere with the drilling process during drilling, when the spring part is stressed to open the sealing cover (namely, when concrete is poured, the limiting effect of the limiting mechanism on the sliding block disappears, the sliding block and the outer cylinder connected with the sliding block slide downwards along the groove under the action of gravity, the outer cylinder stops descending after descending to the bottom of the karst cave, and the shape of the concrete table post is limited through the shape of the outer cylinder.
The second purpose of the invention is to apply any one of the construction equipment for filling concrete into a karst cave to carry out construction of the concrete for filling the karst cave, which comprises the following steps:
s1: mounting and moving the drilling machine to the vicinity of the design position for pouring concrete;
s2: installing a drill rod guide device, and starting a leveling oil cylinder to level the drill rod guide device;
s3: connecting a first section of hollow spiral drill rod with a casing through a bolt, connecting the top end of the first section of hollow spiral drill rod with a power head, and enabling the bottom end of the drill rod with the casing to penetrate through a drill rod guide device;
s4: correcting the deviation of the hollow spiral drill rod and the drill rod with the protective barrel by the drill trial power head;
s5: drilling by a positive rotating power head, and cleaning the slag soil at the hole opening;
s6: when the hollow spiral drill rod above the ground is 1.0m-2.0m higher than the ground, hoisting the next section of hollow spiral drill rod, wherein the top of the newly hoisted hollow spiral drill rod is connected with the power head through a bolt, and the bottom of the newly hoisted hollow spiral drill rod is connected with the previous section of hollow spiral drill rod with the top higher than the ground through a bolt;
s7: after the drill reaches the designed depth of the bottom of the karst cave, firstly, clean water is infused into the karst cave through a channel communicated by a power head middle, a hollow spiral drill rod and a drill rod with a casing to clean the drilled hole; and pumping the concrete into the karst cave and slowly lifting the hollow spiral drill rod to form the concrete column.
S8: and stopping pumping the concrete when the drill bit is lifted to the designed elevation above the karst cave.
S9: lifting the hollow spiral drill rod and the drill rod with the casing to the ground and washing with clean water.
And S10, inserting a steel reinforcement cage or a steel tube into the concrete to enhance the bearing capacity of the concrete column.
S11: in the same cave region, the columns of the dry concrete can be repeatedly arranged according to the plane projection area from S1 to S10 so as to meet the requirement of the basic bearing capacity.
Furthermore, the concrete is low-slump plain concrete doped with an accelerating agent.
The construction method for pouring concrete into the karst cave adopts the concrete column formed by the special equipment provided by the invention, can stabilize rock stratum to the bottom of the karst cave, can greatly improve the bearing capacity of an upper foundation, has high degree of mechanization of the construction equipment, and greatly shortens the construction period compared with the traditional karst cave treatment method.
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 view of construction equipment for grouting concrete in a karst cave according to the present invention;
FIG. 2 is a schematic structural view of a drill rod guide device in the construction equipment for grouting concrete in a karst cave of the invention;
FIG. 3 is a schematic view of a protective cylinder drill rod in the construction equipment for grouting concrete in a karst cave according to the present invention;
FIG. 4 is a sectional view of a drill bit structure of the construction equipment for placing concrete in a karst cave according to the present invention;
FIG. 5 is a schematic view showing the connection between the sealing cover and the spring in the construction equipment for filling concrete into the karst cave according to the present invention;
FIG. 6 is a sectional view of a drill rod structure with a protective cylinder in the construction equipment for grouting concrete in a karst cave according to the present invention;
FIG. 7 is a schematic diagram of a concrete pillar formed by the construction method for placing concrete in a karst cave according to the present invention;
wherein: 1-drilling machine, 11-power head, 12-upright post, 2-hollow auger stem, 3-auger stem with casing, 31-hollow steel pipe, 32-helical blade, 33-movable casing, 331-inner barrel, 332-outer barrel, 333-connecting piece, 334-bearing, 335-groove, 336-sliding block, 34-drill bit, 341-reaming wing, 342-concrete pouring outlet, 343-sealing steel sheet, 344-spring piece, 4-drill stem guide device, 41-base, 42-guide steel barrel, 43-reinforcing rib, 44-leveling oil cylinder, 45-rubber sleeve, 5-concrete pumping vehicle, 6-rubber hose, 7-ball hinge, 8-earthing soil, 9-concrete table post and 10-karst cave.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-6, the present invention provides a construction equipment for grouting concrete in a karst cave, which comprises a drilling machine 1, a hollow auger stem 2, a drill stem with casing 3, a drill stem guide device 4, a concrete pumping vehicle 5 and a connecting pipe, wherein the connecting pipe is preferably a rubber hose 6. It should be noted that the number of the hollow auger stems 2 is at least one, and a plurality of hollow auger stems 2 can be adapted to karst caves with different depths by being sequentially connected in an inserting manner.
Specifically, the drill rod 3 with the casing is arranged at the bottom of the hollow spiral drill rods 2 which are connected in an inserting manner, and the tops of the hollow spiral drill rods 2 which are connected in an inserting manner are fixedly connected with the power head 11 of the drilling machine 1, so that the power head 11 of the embodiment can directly provide drilling torque for the hollow spiral drill rods 2; a drill rod 3 with a casing and a plurality of hollow spiral drill rods 2 which are connected in an inserting mode penetrate through a drill rod guide device 4 to be excavated vertically downwards to form drill holes; the drill rod guiding device 4 is connected with the drilling machine 1 through a spherical hinge 7, the drill rod guiding device 4 comprises a base 41, a guiding steel cylinder 42, a reinforcing rib 43, a plurality of leveling oil cylinders 44 and rubber sleeves 45 which are uniformly distributed along the circumference, wherein the hollow spiral drill rod 2 and the drill rod 3 with the protecting cylinder penetrate through the guiding steel cylinder 42 to vertically drill downwards, the reinforcing rib 43 is arranged at the joint of the base 41 and the guiding steel cylinder 42 to further improve the strength of the drill rod guiding device 4, the rubber sleeves 45 are arranged at the inner side of the guiding steel cylinder 42 to avoid the generation of extrusion force which causes the irreversible deformation of components between the hollow spiral drill rod 2 and the guiding steel cylinder 42 due to the deflection of the hollow spiral drill rod 2, the leveling oil cylinders 44 are arranged at the bottom of the base 41 to play a leveling role on the drill rod guiding device 4, in the embodiment, the number of the leveling oil cylinders 44 is 3, of course, a person, it is within the scope of the invention as long as the leveling action is achieved.
Specifically, a spiral drill rod channel for concrete or water to pass through is arranged in the hollow spiral drill rod 2; the power head 11 is provided with a pipeline for concrete or water to pass through, one end of the pipeline is communicated with the top of the auger stem channel, the other end of the pipeline is provided with a convex opening, and two ends of the rubber hose 6 are respectively connected with the convex opening and a grout outlet of the concrete pumping vehicle 5 through connecting joints, wherein the rubber hose 6 is used for communicating the power head 11 with the concrete pumping vehicle 5, so that a person skilled in the art can select any connecting pipe with a communicating function to achieve the purpose of the invention.
Specifically, the drill rod 3 with the casing comprises a hollow steel pipe 31, a helical blade 32, a movable casing 33 and a drill bit 34; the hollow steel pipe 31 is correspondingly communicated with the bottom of the hollow spiral drill rod channel; the helical blade 32 is provided on the upper portion of the hollow steel pipe 31; the movable casing 33 is arranged at the lower part of the hollow steel pipe 31, the drill bit 34 is fixedly arranged at the bottom end of the hollow steel pipe 31, and a plurality of dry concrete pouring outlets 342 communicated with the hollow steel pipe 31 with the casing drill rod 3 are arranged in the drill bit 34, so that concrete or water sequentially passes through the rubber hose 6, the power head 11, the hollow auger stem 2, the hollow steel pipe 31 and the concrete pouring outlets 342 to enter the karst cave 10.
Specifically, the movable protective cylinder 33 includes an inner cylinder 331, an outer cylinder 332, a connecting piece 333 and a limiting mechanism (not shown in the figure), the inner cylinder 331 is connected with the lower part of the hollow steel pipe 31 through a bearing 334, so that the inner cylinder 331 can freely rotate around the hollow steel pipe 31, a plurality of grooves 335 are uniformly distributed on the inner cylinder 331 along the circumference, and a sliding block 336 capable of sliding along the grooves 335 is arranged in the grooves 335; a limiting mechanism is disposed within the groove 335 to limit the sliding movement of the slider 336 along the groove 335. The length of the movable casing 33 is not specifically limited in this embodiment, and those skilled in the art can design the casing according to actual conditions; it will be appreciated that the invention preferably uses a movable casing 33 having a length greater than the depth of the cavern, which may better limit the shape of the concrete column 9.
Specifically, one end of the reaming wing 341 of the drill bit 34 is connected to the main body of the drill bit 34 through a pin hinge (i.e., the reaming wing 341 is disposed on the outer surface of the drill bit 34), and under the action of cutting force, the reaming wing 341 opens outwards to assist in reaming, and the diameter of the reaming is larger than that of the outer cylinder of the movable protection cylinder, so that the movable protection cylinder 33 and the hollow auger stem 2 descend simultaneously; when concrete is poured, under the action of confining pressure, the reaming wings 341 contract inwards into the outer cylinder 332, and the outer cylinder 332 can slide downwards under the action of the gravity of the concrete in the hollow steel pipe 31, so that the concrete filled in the karst cave 10 is completely limited in the outer cylinder 332, and the shape of the concrete column 9 has a fixed shape. The upper edge of the reaming wings 341 of this embodiment is arc-shaped, which reduces the contact pressure generated when the outer cylinder 332 descends, so that the reaming wings 341 can more easily shrink into the outer cylinder 332.
Specifically, as shown in fig. 5, a sealing cover is disposed outside the concrete pouring outlet 342, the sealing cover of this embodiment is a sealing steel sheet 343, a spring member 344 is disposed between an inner side of the sealing steel sheet 343 and a fixing point inside the concrete pouring outlet 342, the spring member is selected from a tension spring or a spring piece, and the spring member 344 is in an initial tension state, so that the concrete pouring outlet 342 is tightly sealed by the sealing steel sheet 343 under the tension of the spring member 344 in the case of no concrete pouring, and the concrete can break away the sealing steel sheet 343 in the case of a certain concrete pressure. In the embodiment, the sealing steel sheet 343 is selected as the sealing cover, so that the sealing cover has certain rigidity and good pressure bearing capacity, and the sealing steel sheet 343 is not easy to deform and open when drilling downwards.
Specifically, the spring piece 344 is connected with a limiting mechanism, when the spring piece 344 is at an initial state and the sealing steel sheet 343 is closed, the limiting mechanism prevents the sliding block 336 from sliding in the groove 335, the outer cylinder 332 and the inner cylinder 331 are at the same height, the relative positions of the outer cylinder 332 and the hollow steel pipe 31 are fixed during drilling, and the outer cylinder 332 does not interfere with the drilling process; when the spring pieces 344 are stressed to open the sealing steel sheets 343 (namely when concrete is poured), the limiting function of the limiting mechanism on the sliding blocks 336 disappears, the sliding blocks 336 and the outer cylinders 332 connected with the sliding blocks 336 slide downwards along the grooves 335 under the action of gravity, the outer cylinders 332 descend to the bottoms of the karst caves 10 to limit the shapes of the concrete table posts 9, on one hand, the bearing capacity of the processed foundation is improved more preferably, and on the other hand, concrete materials are saved. It should be understood that the present invention is not limited to the specific structure of the limiting mechanism, and those skilled in the art can select any limiting mechanism in the prior art to limit the sliding block 336 of the present invention, and all of them fall within the protection scope of the present invention.
Specifically, the construction equipment is further provided with an automatic drill rod deviation rectifying device, which comprises an upright post 12 arranged on the drilling machine 1, a film pressure sensor arranged between the rubber sleeve 45 and the guide steel cylinder 42, and a leveling terminal (not shown in the figure) connected with the film pressure sensor. It should be noted that the column 12 provided on the drilling machine 1 is rotatable, and the leveling terminal of the present embodiment is similar to a processing terminal, and the leveling terminal can analyze the data of the pressure sensor into the rotation of the column 12, so that the hollow auger 2 can be kept in a vertical state.
Specifically, the drill rod guide device 4 of the embodiment can be adjusted to be horizontal through the leveling cylinder 44 at the lower end of the base, if the hollow auger rod 2 inclines, extrusion force is generated between the hollow auger rod and the rubber sleeve 45, the film pressure sensor measures the distribution of the extrusion force and transmits the distribution to the leveling terminal, and the direction of the upright post 12 can be adjusted in a targeted manner, so that the hollow auger rod 2 is corrected.
According to the invention, the drill rod 3 with the protective cylinder is arranged at one end of the hollow spiral drill rod 2 close to the karst cave, the movable protective cylinder 33 is arranged on the drill rod 3 with the protective cylinder, when concrete is injected into the karst cave, the outer cylinder 332 of the movable protective cylinder 33 moves downwards under the action of gravity, the concrete falls into the outer cylinder 332 in a centralized manner and is solidified quickly, the defect that the concrete is spread outwards in the traditional construction method is reduced, and the loss of materials is effectively reduced.
The invention also provides a construction method for pouring concrete into the karst cave, which comprises the following steps as shown in figure 7:
s1: installing and moving the drilling machine 1 to the vicinity of a design position for pouring concrete;
s2: installing the drill rod guiding device 4, and starting the leveling oil cylinder 44 to level the drill rod guiding device 4;
s3: connecting a first section of hollow spiral drill rod 2 with a drill rod 3 with a protective cylinder through a bolt, connecting the top end of the first section of hollow spiral drill rod 2 with a power head 11, and enabling the bottom end of the drill rod 3 with the protective cylinder to penetrate through a drill rod guide device 4 to enter a position needing construction drilling;
s4: the trial drilling power head 11 corrects the deviation of the hollow spiral drill rod 2 and the drill rod with the protective cylinder 3;
s5: and (3) drilling by the positive rotating power head 11, taking the residue soil out of the orifice by the helical blades on the drill rod 3 with the casing and the hollow helical drill rod 2, and continuously cleaning the residue soil in the orifice until the drill bit drills into the designed position of the bottom surface of the karst cave 10.
S6: when the hollow spiral drill rod 2 above the ground is 1.0m-2.0m higher than the ground, the next hollow spiral drill rod 2 is hoisted, the top of the newly hoisted hollow spiral drill rod 2 is connected with the power head 11 through a bolt, the bottom of the newly hoisted hollow spiral drill rod is connected with the previous hollow spiral drill rod with the top higher than the ground through a bolt, and drilling is continued.
S7: after the drill bit 34 penetrates through the covering soil 8 and reaches the designed position on the bottom surface of the karst cave 10, firstly, clear water is injected into the concrete pumping vehicle 5, under the action of water pressure, the concrete pumping vehicle 5 pumps the clear water into the karst cave 10 through a communication structure of a pipeline in the power head 11, the hollow spiral drill rod 2, the hollow steel pipe 31 with the casing drill rod 3 and a concrete filling outlet 342 of the drill bit 34 so as to wash and clean fillers in the karst cave 10, and the fillers such as garbage and the like in the karst cave 10 can be flushed out of a drill hole through flushing the karst cave 10, so that the concrete molding quality is further improved; and opening a grout outlet of the concrete pumping vehicle 5, pumping low-slump plain concrete doped with an accelerating agent into the karst cave 10 and slowly lifting the hollow auger stem 2, opening the sealing steel sheet 343 under the action of gravity of the concrete, triggering a limiting mechanism by the spring piece 344 to cancel the limiting action on the sliding block 336, sliding the sliding block 336 and the outer cylinder 332 connected with the sliding block along the groove downwards until the outer cylinder 332 descends to the bottom of the karst cave 10, allowing the concrete to enter a space surrounded by the outer cylinder 332 through the concrete pouring outlet 342 at the moment to limit the shape of the concrete column, and finally forming the concrete column 9 with a certain shape. It should be noted that the low slump plain concrete applied in the embodiment has better anti-vibration performance, and after the fresh concrete is strongly vibrated, the phenomena of bleeding, layering and floating slurry are not easy to occur, so that the uniformity of the concrete can be well maintained, and the wrapping property and the workability are better; and because the slump is small, the water consumption of the concrete is reduced, the strength guarantee rate is higher, the dryness of the concrete is reduced, and the cracking resistance is enhanced.
S8: when the drill bit 34 is raised to the design level above the cavern 10, pumping of the concrete is stopped.
S9: lifting the hollow spiral drill rod 2 and the drill rod 3 with the casing to the ground and then washing with clean water.
S10: and a reinforcement cage or a steel pipe is inserted into the concrete to enhance the bearing capacity of the column.
S11: in the same cave 10 area, a plurality of dry concrete columns can be repeatedly arranged according to the plane projection area from S1 to S10 to meet the requirement of the basic bearing capacity.
The construction method for pouring concrete into the karst cave adopts the concrete column 9 formed by the construction of the special equipment provided by the invention, can stabilize rock stratum to the bottom of the karst cave, can greatly improve the bearing capacity of an upper foundation, has high degree of mechanization of the construction equipment, and greatly shortens the construction period compared with the traditional karst cave treatment method.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (10)
1. The utility model provides a construction equipment of solution cavity cast-in-place concrete, includes rig, hollow auger stem, concrete pumping vehicle and connecting pipe, be equipped with the unit head on the rig, the one end of hollow auger stem with the one end of connecting pipe is connected respectively on the unit head, the other end of connecting pipe with concrete pumping vehicle connects, concrete pumping vehicle, connecting pipe, unit head and hollow auger stem's inside communicates in proper order, and its characterized in that still protects a drilling rod including the area, the vertical downward fixed setting of section of thick bamboo drilling rod is protected in the area is in hollow auger stem's the other end.
2. The construction equipment for pouring concrete into a karst cave according to claim 1, wherein the drill rod with the casing comprises a hollow steel pipe, a helical blade, a movable casing and a drill bit, the hollow steel pipe is fixedly communicated with the hollow helical drill rod, the helical blade is arranged at the upper part of the hollow steel pipe, the movable casing is arranged at the lower part of the hollow steel pipe, the drill bit is arranged at the bottom end of the hollow steel pipe, and a concrete pouring outlet is arranged on the drill bit.
3. The construction equipment for pouring concrete into a karst cave according to claim 2, wherein the movable protective cylinder comprises an inner cylinder, an outer cylinder, a connecting piece and a limiting mechanism, the inner cylinder is connected with the lower part of the hollow steel pipe through a bearing, grooves which are communicated up and down are uniformly formed in the outer surface of the inner cylinder along the circumference, sliding blocks are arranged in the grooves and connected with the outer cylinder through the connecting piece, and the limiting mechanism used for limiting the sliding of the sliding blocks along the grooves is further arranged in the grooves.
4. The construction equipment for pouring concrete into a karst cave according to claim 1, wherein the drill bit is provided with reaming wings, the reaming wings are symmetrically arranged on the outer surface of the drill bit, and the upper edges of the reaming wings are arc-shaped.
5. A construction equipment for injecting concrete into a cavern as recited in claim 3, wherein a sealing cover is provided outside the concrete injection outlet, a spring member is provided between an inner side of the sealing cover and an inner side of the concrete injection outlet, and the spring member is in a stretched state in an initial state.
6. A construction equipment for filling concrete into a cave according to claim 5, wherein the limiting mechanism is connected with the spring element, and when the sealing cover is forced to open, the spring element triggers the limiting mechanism to release the sliding block.
7. The construction equipment for injecting concrete into a karst cave according to claim 1, further comprising a drill rod guide device, wherein the drill rod guide device is connected with the drilling machine, and the drill rod with the casing and the hollow spiral drill rod vertically penetrate through the drill rod guide device downwards.
8. The construction equipment for pouring concrete into a karst cave according to claim 7, wherein the drill rod guide device comprises a base, a guide steel cylinder arranged on the base, a rubber sleeve arranged in the guide steel cylinder, a reinforcing rib positioned at the joint of the base and the guide steel cylinder, and leveling oil cylinders uniformly distributed along the circumference at the lower end of the base.
9. The construction equipment for pouring concrete into a karst cave according to claim 8, wherein the construction equipment is further provided with an automatic deviation rectifying device of a drill rod, and the automatic deviation rectifying device comprises a stand column arranged on a drilling machine, a pressure sensor arranged between the rubber sleeve and the guide steel cylinder, and a leveling terminal connected with the pressure sensor.
10. A construction method of the construction equipment for grouting concrete in a cave according to any one of claims 1 to 9, comprising the steps of:
s1: mounting and moving the drilling machine to the vicinity of the design position for pouring concrete;
s2: installing a drill rod guide device, and starting a leveling oil cylinder to level the drill rod guide device;
s3: connecting a first section of hollow spiral drill rod with a casing through a bolt, connecting the top end of the first section of hollow spiral drill rod with a power head, and enabling the bottom end of the drill rod with the casing to penetrate through a drill rod guide device;
s4: correcting the deviation of the hollow spiral drill rod and the drill rod with the protective barrel by the drill trial power head;
s5: drilling by a positive rotating power head, and cleaning the slag soil at the hole opening;
s6: when the hollow spiral drill rod above the ground is 1.0m-2.0m higher than the ground, hoisting the next section of hollow spiral drill rod, wherein the top of the newly hoisted hollow spiral drill rod is connected with the power head through a bolt, and the bottom of the newly hoisted hollow spiral drill rod is connected with the previous section of hollow spiral drill rod with the top higher than the ground through a bolt;
s7: after the drill bit reaches the designed depth of the bottom of the karst cave, firstly, clean water is infused into the karst cave through a channel communicated by a power head, a hollow spiral drill rod and a drill rod with a casing to clean the drilled hole; pumping concrete into the karst cave and slowly lifting the hollow spiral drill rod to form a concrete column;
s8: when the drill bit is lifted to a designed elevation above the karst cave, stopping pumping the concrete;
s9: lifting the hollow spiral drill rod and the drill rod with the casing to the ground and then washing the hollow spiral drill rod and the drill rod with the casing with clean water;
and S10, inserting a steel reinforcement cage or a steel pipe into the concrete to enhance the bearing capacity of the concrete column.
S11: in the same cave region, a plurality of dry concrete columns can be repeatedly arranged according to the plane projection area from S1 to S10 so as to meet the requirement of basic bearing capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010196935.7A CN111364464A (en) | 2020-03-19 | 2020-03-19 | Construction equipment for pouring concrete into karst cave and construction method thereof |
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| CN202010196935.7A CN111364464A (en) | 2020-03-19 | 2020-03-19 | Construction equipment for pouring concrete into karst cave and construction method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151007A (en) * | 2021-09-07 | 2022-03-08 | 浙江吴浙建设有限公司 | Construction equipment for pouring concrete into karst cave |
| CN115247419A (en) * | 2021-04-28 | 2022-10-28 | 广州市建筑科学研究院有限公司 | Full-length steel casing concrete cast-in-place pile construction equipment and method without slurry discharge |
| CN115263208A (en) * | 2022-08-23 | 2022-11-01 | 华亭煤业集团有限责任公司 | Device for accurately collecting drilling cuttings at drilling position and drilling cuttings collecting method |
| CN116181218A (en) * | 2023-04-27 | 2023-05-30 | 陕西省外经贸建设集团有限公司 | Building foundation drilling device |
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2020
- 2020-03-19 CN CN202010196935.7A patent/CN111364464A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115247419A (en) * | 2021-04-28 | 2022-10-28 | 广州市建筑科学研究院有限公司 | Full-length steel casing concrete cast-in-place pile construction equipment and method without slurry discharge |
| CN114151007A (en) * | 2021-09-07 | 2022-03-08 | 浙江吴浙建设有限公司 | Construction equipment for pouring concrete into karst cave |
| CN114151007B (en) * | 2021-09-07 | 2024-04-30 | 无锡市德勤商品混凝土有限公司 | Construction equipment for filling concrete into karst cave |
| CN115263208A (en) * | 2022-08-23 | 2022-11-01 | 华亭煤业集团有限责任公司 | Device for accurately collecting drilling cuttings at drilling position and drilling cuttings collecting method |
| CN115263208B (en) * | 2022-08-23 | 2024-03-19 | 华亭煤业集团有限责任公司 | Device and method for accurately collecting drilling cuttings in drilling position |
| CN116181218A (en) * | 2023-04-27 | 2023-05-30 | 陕西省外经贸建设集团有限公司 | Building foundation drilling device |
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