CN114232611A - Filling device and filling method for karst cave in pile hole - Google Patents
Filling device and filling method for karst cave in pile hole Download PDFInfo
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- CN114232611A CN114232611A CN202111522337.5A CN202111522337A CN114232611A CN 114232611 A CN114232611 A CN 114232611A CN 202111522337 A CN202111522337 A CN 202111522337A CN 114232611 A CN114232611 A CN 114232611A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
Abstract
The invention discloses a filling device and a filling method for a karst cave in a pile hole, which comprises a grouting protection part, a grouting device and a grouting device, wherein the grouting protection part is provided with at least one grouting hole, and a grouting space is formed between the grouting protection part and the inner side wall of the pile hole; the grouting pipe is communicated with the grouting hole, and the rolling support assembly is arranged on the outer wall of the grouting protection part, so that the rolling surface of the rolling part is in pressing contact with the inner wall of the pile hole and can roll up and down along the pile hole; the top of the grouting protection part is connected with hoisting equipment through the hanging device; the plugging device is arranged to be in the position of soil body on the upper part of the rock-socketed section when the grouting protection piece is placed at the bottom of the hole, and the plugging device can radially expand to realize slurry sealing. When the grouting steel cylinder is hung at the bottom of the pile hole, after one-time pressureless grouting is finished, water is injected into the water-injectable closed bag, so that the water-injectable closed bag is expanded to be fully contacted with the soil body on the upper part of the rock-embedded section or expanded into the soil body on the upper part of the rock-embedded section, a closed space is formed between the hole wall and the grouting steel cylinder, and then pressure grouting is carried out on the closed space.
Description
Technical Field
The invention relates to the technical field of filling of karst caves in pile holes, in particular to a filling device and a filling method of the karst caves in the pile holes.
Background
China is one of the countries with the most extensive distribution of karst in the world, and with the rapid development of economy, pile foundation engineering projects are continuously increased, and a plurality of karst areas are occupied by the engineering. Geological disasters in karst areas frequently occur, and risks are high. Certain economic loss is brought to the country and people. The development and development conditions of karst caves are different due to different lithologies of rock masses, so that the condition that the stability of the upper structure is influenced by large displacement of the pile foundations in the karst areas when the pile foundations in the karst areas meet different loads and other secondary disasters are determined.
The damage of the karst cave to the pile foundation construction mainly comprises the following steps: if karst caves exist in the karst area or karst cracks develop strongly, the bearing capacity of rock layers at rock-socketed sections can be greatly reduced, meanwhile, pile foundation construction is carried out in the karst area, the filling of the karst caves is not tight enough, the pile foundation can be lowered, the phenomenon of pile foundation failure can be caused seriously, and therefore the upper building is settled and the like. In addition, after the holes are formed in the karst area, when concrete or other slurry is poured into the pile holes, a large amount of slurry flows into the karst caves or karst cracks, so that the slurry is wasted, and the cost is greatly increased. All the hazards can affect the construction cost and the construction period and endanger the construction and operation safety.
The existing karst cave treatment mainly comprises filling and grouting, the phenomena of incomplete filling, slurry material waste, unexpected filling strength and the like can occur, and certain influence is caused on subsequent construction.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
The present inventors have made intensive studies to achieve the above object, and more particularly, the present invention provides a device and a method for filling a cavern in a pile hole.
The technical scheme is as follows: a pile hole karst cave filling device comprises:
the grouting protection piece is provided with at least one grouting hole, is positioned in the pile hole and forms a grouting space with the inner side wall of the pile hole;
the grouting pipe is communicated with the grouting hole and is used for grouting into the grouting space through a connecting grouting device;
the rolling support assembly comprises a connecting piece and a rolling piece, the connecting piece is used for mounting the rolling piece on the outer wall of the grouting protection piece, so that the rolling surface of the rolling piece is in pressing contact with the inner wall of the pile hole and can roll up and down along the pile hole;
the hanging device is arranged to connect the top of the grouting protection part with the hoisting equipment;
the plugging device is connected to the outer edge of the top opening of the grouting protection piece, is arranged at the position of a soil body on the upper part of the rock-socketed section when the grouting protection piece is placed at the bottom of a hole, and can radially expand to realize slurry sealing.
Preferably, the distance between the outer wall of the grouting protection piece and the wall of the pile hole is 10% -20% of the radius of the pile hole. Preferably, the grouting protection piece is a barrel with an opening at the top end and a sealed bottom.
Preferably, the rolling support assembly adopts an adjustable structure, so that the distance between the rolling member and the grouting protection member can be conveniently adjusted, and the rolling surface of the rolling member is kept in pressing contact with the inner wall of the pile hole.
Preferably, the plugging device is a water injection closed bag, an annular bag with expansion amount more than 30% of the gap between the outer wall of the grouting protection part and the hole wall is adopted, the water injection closed bag is provided with a water injection port, the water injection closed bag is connected with a water injection device through the water injection port, and the water injection closed bag can resist 1Mpa pressure after being plugged.
Preferably, the grouting holes are arranged at any positions of the corresponding rock-socketed section parts of the pile hole when the grouting protection piece is put down to the bottom of the pile hole.
Preferably, at least three lifting holes are uniformly formed in the circumferential direction at the top port of the grouting protection part, a steel cable penetrates through the lifting holes to be fixedly connected with the grouting protection part, and the steel cable intersects at the same point on the center line of the grouting protection part and is connected with hoisting equipment in a hanging mode.
Preferably, the slurry is a normal concrete slurry or a quick setting slurry.
A filling method of a karst cave in a pile hole comprises the following steps:
s1, collecting structural information of the pile hole, wherein the structural information comprises the size of the diameter of the pile hole, the depth of the pile hole and the position of a rock-socketed section, so that the diameter and the depth of the grouting protection piece and the size of the rolling support assembly are determined, the grouting protection piece can be kept at the center of the pile hole after being placed at the bottom of the pile hole, the distance between the grouting protection piece and the wall of the pile hole is 10% -20% of the radius of the pile hole, and the sealing device is located at the upper soil body position of the rock-socketed section;
s2, connecting and fixing the grouting pipe with the grouting hole from the inside of the grouting protection piece, connecting the rolling support assembly with the grouting protection piece, and adjusting the rolling support assembly to enable the rolling surface of each rolling part to be tightly attached to the inner wall of the pile hole; connecting the sealing device with an injection device for filling the sealing device; fixedly connecting the hanging device with the grouting protection piece, and hanging the hanging device and a hook of the hoisting equipment together;
s3, a layer of lubricant is smeared on the outer wall of the grouting protection piece and the sealing device, the grouting protection piece is hoisted to the bottom of the pile hole by using hoisting equipment, in the process, the rolling support assembly enables the grouting protection piece to smoothly move downwards along the pile hole by using the supporting action of the pulley and the pile hole wall, the grouting protection piece and the pile hole are concentrically arranged by using the adjusting support function of the rolling support assembly, and the gap between the grouting protection piece and the pile hole is ensured to be consistent, so that the balanced grouting is ensured;
s4, after the bottom of the pile hole is stabilized, injecting slurry into a grouting space formed by the pile hole and the grouting protection piece through a grouting pipe by using grouting equipment, filling a karst cave, and stopping grouting when the slurry reaches the position of the sealing device;
s5, operating the sealing device to radially expand until the sealing device is fully contacted with the soil body on the upper part of the rock-embedded section or expanded and embedded into the soil body on the upper part of the rock-embedded section;
s6, pressurizing and grouting, wherein the grouting pressure is 0.1-0.8Mpa, if the pressure does not reach a preset value in the pressurizing and grouting process, the grout overflows, the pressure is reduced until the grout does not overflow, the pressure is kept for grouting continuously until the grout is not pressed in, and the grouting is stopped after the pressure is kept for 30 min;
s7, after the slurry is initially set, removing the seal, and then pulling out the grouting protection piece; extract and wash grouting protection spare, wait later stage used repeatedly, if extract comparatively difficultly, accessible slip casting hole is to grouting protection spare outer wall impressed gas, makes things convenient for pulling out of grouting protection spare
S8, removing redundant slurry between the grouting protection piece and the hole wall;
and S9, placing a reinforcement cage in the pile hole according to a conventional mode, pouring concrete, and after the cast-in-place pile is formed, repeating the steps from S1 to S9 to continue to construct the rest cast-in-place pile until the cast-in-place pile is completed.
Preferably, in step S6, the grouting pressure is determined by performing a grouting test, and gradually increasing the pressure, wherein when the pressure is increased to a certain value and the grouting amount is suddenly increased, it indicates that the slab structure is damaged or the size of the voids is enlarged, and the pressure value at this time is used as the basis for determining the allowable grouting pressure.
Compared with the prior art, the invention has the beneficial effects that: compared with the traditional grouting filling, the grouting protection system is placed in the pile hole, so that the sufficient strength of the karst cave after filling can be guaranteed, and the subsequent construction safety can be guaranteed. The grouting machine is simple and rapid in construction, a closed space is formed by the water-injectable closed bag for grouting, the grouting effect can be improved, the grouting amount is reduced, and the cost is saved.
Drawings
Fig. 1 is a schematic structural plan view of an embodiment 1 of the karst cave filling apparatus in a pile hole according to the present invention.
Fig. 2 is a schematic top view of a water-injection closed bag structure of one embodiment of the filling device for caverns in pile holes.
Fig. 3 is a schematic top view of the water-fillable closed bladder structure of embodiment 1 of the filling device for caverns in pile holes of the present invention.
Fig. 4 is a schematic structural diagram of embodiment 2 of the filling device for caverns in pile holes of the present invention.
Fig. 5 is a schematic side view of the structure of the rolling support assembly of embodiment 2 of the karst cave filling device in the pile hole of the invention.
Fig. 6 is a schematic structural elevation view of a rolling support assembly of embodiment 2 of the karst cave filling apparatus in a pile hole according to the present invention.
Fig. 7 is a schematic view of the internal structure of the pile hole after completion of karst cave filling in the pile hole.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the present invention, the following description will be made in terms of several specific embodiments with reference to the accompanying drawings, and the drawings are not intended to limit the embodiments of the present invention.
Example 1
A pile hole 8 is drilled on the earth surface 1, a karst fissure 9 exists in a rock embedding section 10, and the following technical scheme is adopted for realizing the filling of the karst fissure 9.
Referring to fig. 1-3, a karst cave filling device in a pile hole comprises: the grouting protection part 1, the grouting pipe 3, the rolling support assembly 5, the hanging device 6 and the blocking device 4 are arranged in the pile hole, as can be seen from fig. 1, the grouting protection part 1 is positioned in the pile hole and forms a grouting space 7 with the inner wall of the pile hole 8, and the distance between the outer wall of the grouting protection part 1 and the hole wall of the pile hole 8 is 20% of the radius of the pile hole 8. The grouting protection part 1 is a cylinder body 1-1 with an opening at the top end and a sealed bottom, and liquid is injected into the cylinder body 1-1 and used for increasing the weight of the grouting protection part 1 and ensuring the stability of the grouting protection part; the wall of the grouting protection part 1 is provided with a grouting hole 2, and the grouting hole 2 is arranged at any position of the corresponding pile hole rock-socketed section 10 part when the grouting protection part 1 is lowered to the bottom of the pile hole 8. The grouting holes 2 are connected with grouting equipment through the grouting pipes 3 and are used for grouting in a grouting space 7 formed between the grouting protection piece 1 and the pile hole 8. The grouting pipe 3 is a flexible pipe, can be replaced in time when being blocked, is connected with the grouting hole 2 in the cylinder body 1-1 of the grouting protection part 1, and can be in threaded connection, clamping connection and the like. The cylinder body 1-1 of the grouting protection part 1 adopts a sectional type assembly structure, and the cylinder body with the corresponding specification can be selected according to the depth and the diameter of the pile hole 8, and all the cylinder bodies are connected in a sealing way.
The rolling support assembly 5 comprises a connecting part I5-1 and a rolling part I5-2, the connecting part 5-1 is of an adjustable structure, one form of the connecting part I is shown in fig. 1 and fig. 2, the connecting part I5-1 comprises a main body part I5-11 and an expansion part 5-12, one end of the expansion part 5-12 is connected with the rolling part I5-2, the other end of the expansion part 5-12 penetrates through the cylinder wall of the grouting protection part to be connected with the main body part I5-11, the expansion part 5-12 can be adjusted in length relative to the main body part I5-11, and is fixed through a fastening part I5-13 after reaching the required length so as to meet the use requirements of pile holes with different apertures, and the rolling surface of the rolling part I5-2 can be respectively pressed and contacted with the inner wall of the pile hole 8 to keep a tight support state. This form is suitable for the case where the gap between the grouting protector 1 and the inner wall of the pile hole 8 is large. The setting of roll supporting component 5 not only makes things convenient for the central point of slip casting protection piece 1 to fix a position, can effectively prevent moreover that slip casting protection piece 1 radially from rocking in hoist and mount process, avoids consequently the damage to the stake hole that leads to utilize the effect that roll supporting component 5 rolled the support, make slip casting protection piece 1 can transfer to suitable position smoothly.
In this embodiment, the hanging device 6 is configured as a cross-wire structure, and is connected to the top of the grouting protection member 1 for hanging connection with a hook of a hoisting machine.
The plugging device 4 is connected to the outer edge of the top opening of the grouting protection part 1, is positioned below the rolling support component 5, is arranged to be located at the position of soil on the upper part of the rock-socketed section 9 when the grouting protection part 1 is lowered to the bottom of the hole, and is arranged to be radially expanded under the filling action of the plugging device 4 so as to realize slurry sealing. The specific structure is as shown in fig. 1 and fig. 3, the plugging device 4 is a water injection closed bag, an annular bag 4-1 with expansion amount more than 30% of the gap between the outer wall of the grouting protection part 1 and the hole wall is adopted, the water injection closed bag 4-1 is provided with a water injection port 4-2, the water injection device is connected through the water injection port 4-2, and 1Mpa pressure can be resisted after water injection plugging. At the installation position of the plugging device 4 and the grouting protection piece 1, a circle of embedded grooves 4-3 can be arranged on the periphery of the grouting protection piece 1, one side of the plugging device close to the grouting protection piece is embedded into the embedded grooves, connectors are arranged on the peripheries of the embedded grooves 4-3 and are connected through bolts, screws and the like or fixed through adhesives and the like, the depth of the embedded grooves 4-3 is about 1/2 of the ring width of the plugging device, the plugging device is supported before being filled, and the phenomenon that the plugging device falls down due to lack of support to influence grouting is avoided.
The grouting method of the embodiment comprises the following steps:
s1, collecting structural information of a pile hole, wherein the structural information comprises the size of the diameter of the pile hole, the depth of the pile hole and the position of a rock-socketed section, so that the diameter and the depth of the grouting protection piece are determined, the grouting protection piece 1 can be kept at the center of the pile hole after being lowered to the bottom of the pile hole, the distance between the grouting protection piece 1 and the wall of the pile hole 8 is 10% -20% of the radius of the pile hole 8, and the sealing device is positioned at the upper soil body position of the rock-socketed section;
s2, connecting and fixing the grouting pipe 3 with the grouting hole 2 from the inside of the grouting protection piece 1 and the cylinder 1-1, connecting the rolling support assembly 5 with the grouting protection piece 1, and adjusting the rolling support assembly 5 to make the rolling surface of each rolling part closely contact with the inner wall of the pile hole 8; connecting the water-injection closed bag with water injection equipment; fixedly connecting the hanging device 6 with the grouting protection part 1, and hanging the hanging device 6 and a hook of hoisting equipment together;
s3, applying a layer of lubricant on the outer wall of the grouting protection member 1 and the sealing device 4, hoisting the grouting protection member 1 to the bottom of the pile hole by using a hoisting device, wherein the rolling support assembly 5 enables the grouting protection member 1 to smoothly move downwards along the pile hole by using the supporting action of the rolling part and the pile hole wall, and enables the grouting protection member 1 and the pile hole 8 to be concentrically arranged by using the size adjusting function of the rolling support assembly 5, thereby ensuring the consistent gap between the grouting protection member and the pile hole and ensuring balanced grouting;
s4, after the bottom of the pile hole is stabilized, injecting water into the cylinder of the grouting protection piece to prevent the grouting protection piece from floating after slurry is injected, then injecting the slurry into a grouting space 7 formed by the pile hole and the grouting protection piece through a grouting pipe by grouting equipment to fill the karst cave, and stopping grouting when the slurry reaches the position of the sealing device;
s5, pressurizing and injecting water into the water-injection closed bag to expand the bag to be fully contacted with or embedded into the soil body on the upper part of the rock-embedded section;
s6, pressurizing and grouting, firstly, performing a grouting test, determining grouting pressure, adopting a method for gradually increasing the pressure, when the pressure is increased to a certain value and the grouting amount is suddenly increased, indicating that the slab structure is damaged or the size of a gap is enlarged, taking the pressure value at the moment as the basis for determining the allowable grouting pressure, wherein the grouting pressure is 0.1-0.8Mpa, if the pressure does not reach a preset value in the pressurizing and grouting process, the pressure is reduced until the grout does not overflow, the pressure is kept for continuous grouting until the grout is not pressed in, and the grouting is stopped after the pressure is kept for 30 min;
s7, after slurry is initially set, pumping water in the water-injection closed bag, pumping water in the grouting protection part barrel 1-1, then pulling out and cleaning the grouting protection part 1, and after the grouting protection part is repeatedly used in the later period, if the grouting protection part is difficult to pull out, pressing gas into the outer space of the grouting protection part through the grouting hole, so that the grouting protection part can be conveniently pulled out;
s8, removing the redundant slurry between the grouting protection piece 1 and the wall of the pile hole by using a rotary excavating machine;
and S9, placing a reinforcement cage in the pile hole according to a conventional mode, pouring concrete, and after the cast-in-place pile is formed, repeating the steps from S1 to S9 to continue to construct the rest cast-in-place pile until the cast-in-place pile is completed.
Example 2
As shown in fig. 4, 5 and 6, the karst cave filling device in the pile hole comprises: grouting protection piece 1, grouting pipe 2, rolling support assembly 5, hanging device 6 and plugging device 4.
In this embodiment, the grouting protection piece 1 still adopts a bottom-sealed cylinder 1-1 structure, and the gap distance between the grouting protection piece 1 and the inner side wall of the pile hole 8 is 10% of the radius of the pile hole 8. The rolling support assembly 5 can adopt another form, as shown in fig. 5 and 6, and includes a connection portion two 5-3 and a rolling portion two 5-4, the connection portion two 5-3 is an adjustable structure, and includes a main body portion two 5-31 and an adjusting groove 5-32, the main body portion two 5-31 is connected with the grouting protection member 1 by means of bolts or riveting or welding, the main body portion two 5-31 is provided with a transverse adjusting groove 5-32, the rolling portion two 5-4 is mounted on a shaft rod 5-42 through a bearing 5-41, the shaft rod 5-42 can horizontally move along the adjusting groove 5-32 and can be screwed and fixed by a screwing device two 5-43. In order to further improve the pressing effect of the rolling part II 5-4 and the pile hole wall, an elastic element 5-5 can be installed on the main body part II 5-31, in the embodiment, a spring is selected, one end of the spring is connected with the main body part II 5-31, the other end of the spring is connected with the rolling part II 5-4, and the force of the spring is utilized to play a role in buffering and tensioning the rolling part II 5-4 towards the pile hole 8 wall.
In this example, the method of filling the pile hole cavern is the same as that of example 1.
In the invention, the grouting protection part can adopt a cylinder structure with a sealed bottom, or a cylinder structure with an unsealed bottom, a cylinder structure with a sealed upper part and a sealed lower part, or a solid cylindrical structure, and the final purpose is to form a space which can meet the requirements of complete filling, no waste of grout and improved filling strength in a pile hole. The grouting protection member is not limited to increase the weight of the grouting protection member by means of water injection, and other substances such as sand, soil or compressed gas can be injected, or the grouting protection member can be pressurized from the top directly through a pressurizing device. The sealing device is not limited to water injection and can inject gas. The rolling part of the rolling support component can be a roller, a sphere or the like.
In the embodiment, the slurry is selected according to engineering requirements, common concrete slurry is generally selected, and quick-setting slurry such as water glass mortar and the like can be selected under the condition of short construction period.
Fig. 7 is a schematic diagram of the internal structure of the pile hole after the karst cave in the pile hole is filled according to the two embodiments, and the pile foundation construction is realized by performing subsequent operations of placing a reinforcement cage and pouring concrete on the foundation.
Industrial applicability
The filling device and the filling method for the karst cave in the pile hole can be manufactured and used in the field of filling the karst fissure in the pile hole.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A pile hole karst cave filling device comprises:
the grouting protection piece is provided with at least one grouting hole, is positioned in the pile hole and forms a grouting space with the inner side wall of the pile hole;
the grouting pipe is communicated with the grouting hole and is used for grouting into the grouting space through a connecting grouting device;
the rolling support assembly comprises a connecting piece and a rolling piece, the connecting piece is used for mounting the rolling piece on the outer wall of the grouting protection piece, so that the rolling surface of the rolling piece is in pressing contact with the inner wall of the pile hole and can roll up and down along the pile hole;
the hanging device is arranged to connect the top of the grouting protection part with the hoisting equipment;
the plugging device is connected to the outer edge of the top opening of the grouting protection piece, is arranged at the position of a soil body on the upper part of the rock-socketed section when the grouting protection piece is placed at the bottom of a hole, and can radially expand to realize slurry sealing.
2. The pile hole karst cave filling apparatus of claim 1, wherein the distance between the outer wall of the grouting guard and the wall of the pile hole is 10-20% of the radius of the pile hole.
3. The pile hole cavern filling device of claim 1, wherein the grouting protection member is a cylinder with an open top and a sealed bottom.
4. The pile hole karst cave filling device of claim 1, wherein the rolling support assembly is adjustable to facilitate adjustment of the distance between the rolling member and the grouting protection member, and to maintain the rolling surface of the rolling member in pressing contact with the inner wall of the pile hole.
5. The pile hole karst cave filling device of claim 1, wherein the plugging device is a water-injectable closed bag, an annular bag with an expansion amount more than 30% of the gap between the outer wall of the grouting protection part and the hole wall is adopted, the water-injectable closed bag is provided with a water injection port, the water injection port is connected with a water injection device, and the water injection device can resist 1MPa pressure after being plugged by water injection.
6. The pile hole karst cave filling apparatus of claim 1, wherein said grouting hole is disposed at any position of the rock-socketed section of the pile hole corresponding to the grouting protection member when the grouting protection member is lowered to the bottom of the pile hole.
7. The pile hole karst cave filling device of claim 1, wherein the top port of the grouting protection part is uniformly provided with at least three lifting holes along the circumferential direction, and a steel cable is fixedly connected with the grouting protection part through the lifting holes, intersects at the same point on the center line of the grouting protection part and is connected with a hoisting device in a hanging manner.
8. A pile hole karst cave filling device according to claim 1, wherein the grout is common concrete grout or quick setting grout.
9. The filling method of the pile hole inner cavern filling device according to any one of claims 1 to 7, comprising the following steps:
s1, collecting structural information of the pile hole, wherein the structural information comprises the size of the diameter of the pile hole, the depth of the pile hole and the position of a rock-socketed section, so that the diameter and the depth of the grouting protection piece and the size of the rolling support assembly are determined, the grouting protection piece can be kept at the center of the pile hole after being placed at the bottom of the pile hole, the distance between the grouting protection piece and the wall of the pile hole is 10% -20% of the radius of the pile hole, and the sealing device is located at the upper soil body position of the rock-socketed section;
s2, connecting and fixing the grouting pipe with the grouting hole from the inside of the grouting protection piece, connecting the rolling support assembly with the grouting protection piece, and adjusting the rolling support assembly to enable the rolling surface of each rolling part to be tightly attached to the inner wall of the pile hole; connecting the sealing device with an injection device for filling the sealing device; fixedly connecting the hanging device with the grouting protection piece, and hanging the hanging device and a hook of the hoisting equipment together;
s3, a layer of lubricant is smeared on the outer wall of the grouting protection piece and the sealing device, the grouting protection piece is hoisted to the bottom of the pile hole by using hoisting equipment, in the process, the rolling support assembly enables the grouting protection piece to smoothly move downwards along the pile hole by using the supporting action of the pulley and the pile hole wall, the grouting protection piece and the pile hole are concentrically arranged by using the adjusting support function of the rolling support assembly, and the gap between the grouting protection piece and the pile hole is ensured to be consistent, so that the balanced grouting is ensured;
s4, after the bottom of the pile hole is stabilized, injecting slurry into a grouting space formed by the pile hole and the grouting protection piece through a grouting pipe by using grouting equipment, filling a karst cave, and stopping grouting when the slurry reaches the position of the sealing device;
s5, operating the sealing device to radially expand until the sealing device is fully contacted with the soil body on the upper part of the rock-embedded section or expanded and embedded into the soil body on the upper part of the rock-embedded section;
s6, pressurizing and grouting, wherein the grouting pressure is 0.1-0.8Mpa, if the pressure does not reach a preset value in the pressurizing and grouting process, the grout overflows, the pressure is reduced until the grout does not overflow, the pressure is kept for grouting continuously until the grout is not pressed in, and the grouting is stopped after the pressure is kept for 30 min;
s7, after the slurry is initially set, removing the seal, and then pulling out the grouting protection piece;
s8, removing redundant slurry between the grouting protection piece and the hole wall;
and S9, placing a reinforcement cage in the pile hole according to a conventional mode, pouring concrete, and after the cast-in-place pile is formed, repeating the steps from S1 to S9 to continue to construct the rest cast-in-place pile until the cast-in-place pile is completed.
10. The method for filling the cavern in the pile hole according to claim 9, wherein in step S6, the grouting pressure is determined by performing a grouting test, and gradually increasing the pressure, wherein when the pressure is increased to a certain value and the grouting amount is suddenly increased, the pressure value indicates that the slab structure is damaged or the size of the void is enlarged, and the pressure value at that time is used as the basis for determining the allowable grouting pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111522337.5A CN114232611B (en) | 2021-12-14 | 2021-12-14 | Filling device and filling method for karst cave in pile hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111522337.5A CN114232611B (en) | 2021-12-14 | 2021-12-14 | Filling device and filling method for karst cave in pile hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114232611A true CN114232611A (en) | 2022-03-25 |
| CN114232611B CN114232611B (en) | 2023-03-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115142409A (en) * | 2022-06-20 | 2022-10-04 | 中国建筑第八工程局有限公司 | Pile foundation pore-forming slurry leakage repairing device and construction method thereof |
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| CN112030956A (en) * | 2020-07-15 | 2020-12-04 | 中交第一航务工程局有限公司 | Karst stratum bored pile construction method |
| CN214614083U (en) * | 2021-02-05 | 2021-11-05 | 云南建投基础工程有限责任公司 | Grouting assembly for repairing quality defects of karst geological cast-in-place pile |
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| US20090269146A1 (en) * | 2005-04-22 | 2009-10-29 | Bozidar Miljovski | Method for Construction of Piles and Caissons and Soil Improvement by Using Rubber Hoses |
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| CN110761265A (en) * | 2019-10-30 | 2020-02-07 | 大连交通大学 | Karst cave disposal method for deep foundation pit pile foundation construction in karst area |
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| CN112030956A (en) * | 2020-07-15 | 2020-12-04 | 中交第一航务工程局有限公司 | Karst stratum bored pile construction method |
| CN214614083U (en) * | 2021-02-05 | 2021-11-05 | 云南建投基础工程有限责任公司 | Grouting assembly for repairing quality defects of karst geological cast-in-place pile |
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| CN115142409A (en) * | 2022-06-20 | 2022-10-04 | 中国建筑第八工程局有限公司 | Pile foundation pore-forming slurry leakage repairing device and construction method thereof |
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| CN114232611B (en) | 2023-03-14 |
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