CN112227356A - Gravel grouting steel pipe pile and preparation method thereof - Google Patents
Gravel grouting steel pipe pile and preparation method thereof Download PDFInfo
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- CN112227356A CN112227356A CN201910635007.3A CN201910635007A CN112227356A CN 112227356 A CN112227356 A CN 112227356A CN 201910635007 A CN201910635007 A CN 201910635007A CN 112227356 A CN112227356 A CN 112227356A
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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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
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Abstract
The invention relates to the technical field of pile foundations, in particular to a gravel grouting steel pipe pile and a preparation method thereof, wherein the gravel grouting steel pipe pile provided by the invention can be adopted in a common building construction site, can also be adopted in the process of reinforcing the foundation of an existing building with limited space, and meanwhile, gravel grouting consolidation bodies are arranged on the inner side and the outer side of the steel pipe to form protection on the steel pipe, so that the steel pipe can be effectively prevented from being rusted; through setting up primary grouting pipe and secondary grouting pipe, guarantee rubble slip casting steel-pipe pile can carry out twice slip casting at the work progress, and the grout accessible infiltration of secondary injection, splitting effect get into pile tip and pile week soil body, make the soil body in the pile week uniform thickness participate in the pile body atress, improved the bearing capacity of rubble slip casting steel-pipe pile, its vertical bearing capacity has improved 20 ~ 30% than same diameter drilling bored concrete pile.
Description
Technical Field
The invention relates to the technical field of pile foundations, in particular to a gravel grouting steel pipe pile and a preparation method thereof.
Background
The pile foundation is a common deep foundation form, and when the settlement of a natural foundation is too large or the bearing capacity of the foundation cannot meet the design requirement, the pile foundation is often adopted and is divided into concrete piles, steel piles and wood piles according to the pile body materials; for steel piles, the steel pipe piles are widely applied due to the advantages of good rigidity, high bearing capacity, difficulty in damage, easiness in pile length adjustment, small soil discharge amount and the like.
But present steel-pipe pile needs comparatively complicated equipment in the work progress, and the space that the work progress occupy is great, and because steel-pipe pile and soil layer direct contact cause the corrosion problem easily.
Disclosure of Invention
The invention aims to provide a gravel grouting steel pipe pile (GGP) and a preparation method thereof, wherein the gravel grouting steel pipe pile can be adopted in a common building construction site and also can be adopted in the process of reinforcing a foundation of a building with limited space, and meanwhile, the corrosion of a steel pipe is avoided, and the larger bearing capacity is provided.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a gravel grouting steel pipe pile which is characterized by comprising a primary grouting pipe 1, a pile top secondary grouting pipe 2, a pile end secondary grouting pipe 3, a steel pipe 4, a steel pipe outer gravel grouting consolidation body 5, a steel pipe inner gravel grouting consolidation body 6, a pile peripheral soil body 7, a positioning ring 8, a pipe end grouting device 9 and inner and outer communication holes 10.
Preferably, the wall thickness of the steel pipe 4 is more than or equal to 6 mm;
the steel pipe 4 is composed of segmented steel pipes; the length of the segmented steel pipe is 3-6 m;
the pipe wall of the sectioned steel pipe is provided with inner and outer communicating holes 10.
Preferably, the diameter of the inner and outer communicating holes 10 is 8 mm;
the maximum vertical distance between the adjacent inner and outer communication holes 10 in the radial direction perpendicular to the steel pipe 4 is 200 mm;
the number of the inner and outer communicating holes 10 in the circumferential direction at the same vertical height of the steel pipe 4 is more than or equal to 4.
Preferably, the maximum vertical distance between adjacent positioning rings 8 in the radial direction perpendicular to the steel pipe 4 is 3000 mm;
the number of the positioning rings 8 in the circumferential direction at the same vertical height of the steel pipe 4 is 3.
Preferably, the number of the primary grouting pipes 1 is 2; the number of the pile top secondary grouting pipes 2 is 1; the number of the pile end secondary grouting pipes 3 is 2;
the primary grouting pipe 1, the pile top secondary grouting pipe 2 or the pile end secondary grouting pipe 3 are arranged on the inner wall of the steel pipe 4;
the primary grouting pipe 1, the pile top secondary grouting pipe 2 and the pile end secondary grouting pipe 3 are arranged at intervals in the circumferential direction at the same vertical height.
Preferably, the length of the primary grouting pipe 1 extending out of the bottom of the steel pipe 4 is more than or equal to 100 mm; the length of the pile end secondary grouting pipe 3 extending out of the bottom of the steel pipe 4 is more than or equal to 200mm, and the bottom end of the pile top secondary grouting pipe 2 is positioned 2m below the top of the steel pipe 4;
the length of the primary grouting pipe 1 extending out of the bottom of the steel pipe 4 is less than the length of the pile end secondary grouting pipe 3 extending out of the bottom of the steel pipe 4.
Preferably, the particle size of the crushed stone in the steel pipe outer crushed stone grouting consolidation body 5 or the steel pipe inner crushed stone grouting consolidation body 6 is 5-20 mm;
the preparation raw materials of the steel pipe outer gravel grouting consolidation body 5 or the steel pipe inner gravel grouting consolidation body 6 are independently gravel grouting consolidation bodies;
the gravel grouting consolidation body comprises gravel and cement paste; the water-cement ratio of the cement paste is 0.6-0.8.
Preferably, the pipe end grouting device 9 is arranged at the pipe bottom ends of the primary grouting pipe 1, the pile top secondary grouting pipe 2 and the pile end secondary grouting pipe 3;
the pipe end grouting device 9 is respectively integrated with the primary grouting pipe 1, the pile top secondary grouting pipe 2 or the pile end secondary grouting pipe 3;
the pipe end grouting device 9 comprises a grout outlet 11, a high-pressure adhesive tape 12, a transparent adhesive tape 13 and a pipe bottom plug 14.
The invention also provides a preparation method of the gravel grouting steel pipe pile, which comprises the following steps:
drilling and cleaning holes at the selected position of the gravel grouting steel pipe pile, putting a steel pipe 4 provided with a primary grouting pipe 1, a pile top secondary grouting pipe 2, a pile end secondary grouting pipe 3 and a positioning ring 8, and positioning in the drilled hole through the positioning ring 8;
and filling broken stones on the inner side and the outer side of the steel pipe 4 by a water return method, and then sequentially performing primary grouting and secondary grouting to obtain the broken stone grouting steel pipe pile after cement paste is solidified.
Preferably, the water return method is to fill the crushed stones and simultaneously inject clean water into the inner side and the outer side of the steel pipe 4 through the primary grouting pipe 1;
the first grouting is to inject first cement paste into the inner side and the outer side of the steel pipe 4 through a primary grouting pipe 1 until no mud flows out from an orifice of a drill hole of the steel pipe pile provided with gravel grouting, and stopping grouting; the water-cement ratio of the first cement slurry is 0.8;
and the secondary grouting is to sequentially inject second cement paste to the inner side and the outer side of the steel pipe 4 near the bottom and the top of the steel pipe 4 through a pile end secondary grouting pipe 3 and a pile top secondary grouting pipe 2 until the grouting pressure is 5-8 MPa, and stop grouting after the grouting is stabilized for 3-5 min, wherein the water-cement ratio of the second cement paste is 0.6.
The invention provides a gravel grouting steel pipe pile (GGP), which comprises a primary grouting pipe 1, a pile top secondary grouting pipe 2, a pile end secondary grouting pipe 3, a steel pipe 4, a steel pipe outer gravel grouting consolidation body 5, a steel pipe inner gravel grouting consolidation body 6, a pile periphery soil body 7, a positioning ring 8, a pipe end grouting device 9 and inner and outer communication holes 10. The gravel grouting steel pipe pile (GGP) can be adopted in a common building construction site, can also be adopted when the space is limited, namely a foundation of a building is reinforced, and meanwhile, the gravel grouting consolidation bodies are arranged on the inner side and the outer side of the steel pipe to form protection on the steel pipe, so that the steel pipe can be effectively prevented from being corroded; through setting up primary grouting pipe and secondary grouting pipe, guarantee rubble slip casting steel-pipe column can carry out twice slip casting at the work progress, and the grout accessible infiltration of secondary injection, splitting effect get into pile tip and pile week soil body, make the soil body in the pile week uniform thickness participate in the pile body atress, improved the bearing capacity of rubble slip casting steel-pipe pile (GGP), its vertical bearing capacity has improved 20 ~ 30% than same diameter drilling bored concrete pile.
Drawings
FIG. 1 is a schematic diagram of the structure of GGP;
FIG. 2 is a schematic structural view of a pipe end grouting device;
FIG. 3 is a sectional view of GGP;
the method comprises the following steps of 1-primary grouting pipe, 2-pile top secondary grouting pipe, 3-pile end secondary grouting pipe, 4-steel pipe, 5-steel pipe outer gravel grouting consolidation body, 6-steel pipe inner gravel grouting consolidation body, 7-pile periphery soil body, 8-positioning ring, 9-pipe end grouting device, 10-inner and outer communication hole, 11-grout outlet, 12-high pressure adhesive tape, 13-transparent adhesive tape and 14-pipe bottom plug.
Detailed Description
The invention provides a gravel grouting steel pipe pile (GGP), which comprises a primary grouting pipe 1, a pile top secondary grouting pipe 2, a pile end secondary grouting pipe 3, a steel pipe 4, a steel pipe outer gravel grouting consolidation body 5, a steel pipe inner gravel grouting consolidation body 6, a pile periphery soil body 7, a positioning ring 8, a pipe end grouting device 9 and inner and outer communication holes 10 (shown in figure 1).
As a specific embodiment of the present invention, the number of the primary grouting pipes 1 is preferably 2; the number of the pile top secondary grouting pipes 2 is preferably 1; the number of the pile end secondary grouting pipes 3 is preferably 2;
the primary grouting pipe 1, the pile top secondary grouting pipe 2 or the pile end secondary grouting pipe 3 are preferably arranged on the inner wall of the steel pipe 4;
the primary grouting pipe 1, the pile top secondary grouting pipe 2 and the pile end secondary grouting pipe 3 are arranged at intervals in the circumferential direction at the same vertical height.
The primary grouting pipe 1, the pile top secondary grouting pipe 2 or the pile end secondary grouting pipe 3 are connected with the inner wall of the steel pipe 4 in a welding mode (as shown in fig. 3).
As a specific embodiment of the invention, the length of the primary grouting pipe 1 extending out of the bottom of the steel pipe 4 is preferably equal to or more than 100mm, more preferably 100mm, and the inner diameter of the primary grouting pipe 1 is preferably equal to or more than 20mm, more preferably 25 mm; the bottom end of the pile top secondary grouting pipe 2 is located 2m below the top of the steel pipe 4, the length of the pile end secondary grouting pipe 3 extending out of the bottom of the steel pipe 4 is preferably more than or equal to 200mm, more preferably 200mm, and the inner diameters of the pile top secondary grouting pipe 2 and the pile end secondary grouting pipe 3 are preferably more than or equal to 20mm, more preferably 25 mm; the length of the primary grouting pipe 1 extending out of the bottom of the steel pipe 4 is less than the length of the pile end secondary grouting pipe 3 extending out of the bottom of the steel pipe 4.
As a specific embodiment of the present invention, the primary grouting pipe 1, the pile top secondary grouting pipe 2, or the pile end secondary grouting pipe 3 is preferably welded by a DN20 welded pipe, the joint of the DN20 welded pipe is preferably welded by a DN25 welded pipe, and the primary grouting pipe 1, the pile top secondary grouting pipe 2, and the pile end secondary grouting pipe 3 are welded to the inner wall of the steel pipe 4.
As a specific embodiment of the present invention, one end of the primary grouting pipe 1, the pile top secondary grouting pipe 2 or the pile end secondary grouting pipe 3 near the bottom of the steel pipe 4 preferably includes a pipe end grouting device 9, and the pipe end grouting device 9 is integrated with the primary grouting pipe 1, the pile top secondary grouting pipe 2 or the pile end secondary grouting pipe 3 respectively; the pipe end grouting device 9 preferably comprises a grout outlet 11, a high-pressure adhesive tape 12, a transparent adhesive tape 13 and a pipe bottom plug 14 (shown in figure 3); the aperture of the slurry outlet 11 is preferably 6-10 mm, and more preferably 8 mm; the number of the slurry outlets 11 is preferably 6-10, and more preferably 8; the distance between the grout outlets 11 in the direction along the primary grouting pipe 1, the pile top secondary grouting pipe 2 or the pile end secondary grouting pipe 3 is preferably 50-70 mm, and more preferably 60 mm; the number of the grout outlets 11 in the circumferential direction is preferably 2-3, and more preferably 2. The high-voltage adhesive tape 12 is preferably a high-voltage adhesive tape for electricians, and 2-3 layers of the high-voltage adhesive tape are wrapped outside the slurry outlet 11; the transparent adhesive tape 13 is wrapped on the outer side of the high-pressure adhesive tape.
As a specific embodiment of the invention, the wall thickness of the steel pipe 4 is preferably equal to or more than 6mm, and more preferably 8 mm; the outer diameter of the steel pipe 4 is adjusted according to the hole forming diameter for placing the steel pipe pile, and specifically, the outer diameter of the steel pipe 4 is preferably smaller than the hole forming diameter for placing the steel pipe pile by 100-150 mm, and more preferably smaller than the hole forming diameter for placing the steel pipe pile by 150 mm; the steel pipe 4 is preferably composed of segmented steel pipes; the length of the segmented steel pipe is preferably 3-6 m, and the length of the segmented steel pipe is preferably determined according to the size of an operation space, for example: the length of the segmented steel pipe is preferably 3m when the working space height is about 4m, and is preferably 6m when the working space height is about 8 m.
As a specific embodiment of the present invention, the segmented steel pipe is provided with inner and outer communication holes 10, the diameter of the inner and outer communication holes 10 is preferably 8mm, and the maximum vertical distance between adjacent inner and outer communication holes 10 in the radial direction perpendicular to the steel pipe 4 is preferably 200 mm; the number of the inner and outer communication holes 10 in the circumferential direction at the same vertical height of the steel pipe 4 is preferably not less than 4, and more preferably 6.
As a specific embodiment of the invention, two adjacent sections of the segmental steel pipes are welded and lengthened by adopting pull plates, and the pull plates are uniformly arranged on the circumference of the steel pipe 4; the number of the pulling plates in the circumferential direction is preferably 3-6, and more preferably 4; the method has no special requirements on the material, thickness and width of the pulling plate, adopts common steel plates well known by the technical personnel in the field, and can meet the strength requirement of the gravel grouting steel pipe pile (GGP) in the using process.
As a specific embodiment of the present invention, the positioning rings 8 are disposed on the outer wall of the steel pipe 4, and the maximum vertical distance between adjacent positioning rings 8 in the radial direction perpendicular to the steel pipe 4 is preferably 3000 mm; the number of the positioning rings 8 in the circumferential direction at the same vertical height of the steel pipe 4 is preferably 3; the positioning ring 8 can ensure that the steel pipe 4 is positioned at the center of the drilled hole formed in the soil body 7 around the pile.
As a specific embodiment of the invention, the particle size of the crushed stone in the crushed stone grouting and consolidating body 5 outside the steel pipe or 6 inside the steel pipe is preferably 5-20mm, and more preferably 5-16.5 mm; the mud content of the broken stone is preferably less than or equal to 1.0 percent, the mud block content is preferably less than or equal to 0.5 percent, and the needle and flake content is preferably less than or equal to 15 percent; the preparation raw materials of the steel pipe outer gravel grouting consolidation body 5 or the steel pipe inner gravel grouting consolidation body 6 are independently gravel grouting consolidation bodies; the gravel grouting consolidation body preferably comprises gravel and cement paste; the invention has no special limitation on the dosage ratio of the gravel and the cement paste. The method comprises the following steps of preparing a steel pipe external gravel slurry body 5, and preparing an internal gravel slurry body 6, wherein the steel pipe external gravel slurry body is prepared from a first gravel slurry body and a second gravel slurry body; in the invention, the first gravel grouting consolidation body preferably comprises gravel and first cement paste; the first cement slurry preferably comprises P.O42.5 cement, a water reducing agent, an expanding agent and water in parts by weight; the invention has no special limitation on the types of the water reducing agent and the expanding agent, and can adopt the types well known by the technical personnel in the field; in the invention, the mass percentage of the water reducing agent in the first cement slurry is preferably 1-2%, and more preferably 1.5%; the mass percentage of the expanding agent in the first cement slurry is preferably 6-8%, and more preferably 8%. The water-cement ratio of the first cement slurry is preferably 0.8. In the present invention, the components and proportions of the second cement slurry are preferably referred to the first cement slurry, except that the water cement ratio of the second cement slurry is 0.6.
The invention also provides a preparation method of the gravel grouting steel pipe pile (GGP) in the technical scheme, which comprises the following steps:
drilling and cleaning holes at the selected position of the gravel grouting steel pipe pile (GGP), putting a steel pipe 4 provided with a primary grouting pipe 1, a pile top secondary grouting pipe 2, a pile end secondary grouting pipe 3 and a positioning ring 8, and positioning in the drilled hole through the positioning ring 8;
and filling broken stones on the inner side and the outer side of the steel pipe 4 by a water return method, and then sequentially performing primary grouting and secondary grouting to obtain a broken stone grouting steel pipe pile (GGP) after cement paste is solidified.
Drilling and cleaning holes at the selected position of a gravel grouting steel pipe pile (GGP), putting a steel pipe 4 provided with a primary grouting pipe 1, a pile top secondary grouting pipe 2, a pile end secondary grouting pipe 3 and a positioning ring 8, and positioning in the drilled hole through the positioning ring 8;
in the present invention, the borehole is preferably a mud dado borehole; but when the underground water level is deep and the hole wall is stable, dry drilling can be adopted. Taking slurry wall-protecting drilling as an example: the concrete drilling process is preferably to select drilling equipment according to the pile diameter of a gravel grouting steel pipe pile (GGP) and the size of an operation space; for example, when the pile diameter of the gravel grouting pipe pile is less than or equal to 300mm and the height of the operation space is less than 4m, micro drilling equipment needs to be selected; when the stake footpath of rubble slip casting tubular pile is in 300 ~ 600 mm's within range, when the operation space height is in 4 ~ 8 m's within range, need choose the drilling equipment of medium and small model for use. In the present invention, the hole diameter of the drilled hole is preferably 100mm or more larger than the outer diameter of the steel pipe 3; in the present invention, the deviation of the hole diameter of the drilled hole is preferably ± 20mm, and the deviation of the hole perpendicularity of the drilled hole is preferably < 1%. In the invention, the concrete process of cleaning the hole is preferably to inject dilute slurry into the drilled hole to replace the concentrated slurry remained in the drilled hole in the drilling process; in the invention, the dilute slurry is preferably slurry with the specific gravity of 1.06-1.1 and the sand content of less than 4%; in the present invention, the purpose of said cleaning is to make the mud weight in the drill hole less than 1.15 and the sand content less than 4%.
In the present invention, when the segmented steel pipes (which meet the above definition of the segmented steel pipes) in the steel pipes 4 are welded, it is preferable to correct the verticality of the segmented steel pipes in two mutually perpendicular directions by using a horizontal ruler; the present invention does not specifically limit the specific conditions for the welding, and the conditions known to those skilled in the art may be used. In the present invention, the primary grouting pipe 1, the pile top secondary grouting pipe 2, and the pile end secondary grouting pipe 3 are fixed to the inner wall of the steel pipe 4 by welding, and the welding conditions of the present invention are not limited to any particular conditions, and may be performed by welding using conditions known to those skilled in the art.
After the steel pipe 4 provided with the primary grouting pipe 1, the pile top secondary grouting pipe 2, the pile end secondary grouting pipe 3 and the positioning ring 8 is positioned in the hole provided with the gravel grouting steel pipe pile (GGP) through the positioning ring 8, the invention fills gravel on the inner side and the outer side of the steel pipe 4 through a water return method, then carries out primary grouting and secondary grouting in sequence, and obtains the gravel grouting steel pipe pile (GGP) after cement slurry is solidified. In the present invention, the water returning method is preferably performed by filling crushed stones and simultaneously injecting clean water into the inside and outside of the steel pipe 4 through the primary grouting pipe 1. In the invention, the process of filling the gravels is uniform and slow; the speed of filling the crushed stones is preferably 400-500 kg/min, and more preferably 400 kg/min.
According to the invention, clear water is injected while filling the broken stones, so that the broken stones are compact, and the broken stones can be uniformly and slowly filled, so that the broken stone bridging blockage can be prevented.
In the invention, the first grouting is preferably to inject first cement paste into the inner side and the outer side of the steel pipe 4 through a primary grouting pipe 1 until no mud flows out from the orifice of the drill hole provided with the gravel grouting steel pipe pile (GGP), and stop grouting; carrying out secondary grouting after the initial setting of the cement slurry injected in the primary grouting; and preferably, the second grouting is performed sequentially through a pile end secondary grouting pipe 3 and a pile top secondary grouting pipe 2, second cement paste is respectively injected into the inner side and the outer side of the steel pipe 4 near the bottom and the top of the steel pipe 4 until the grouting pressure is 5-8 MPa, and the grouting is stopped after the stability is maintained for 3-5 min.
The gravel-grouted steel pipe pile (GGP) and the method for manufacturing the same according to the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
In an alumina plant located in Shanxi province, a seed decomposer needs to be reinforced due to large sedimentation (foundation soil mainly comprises silty clay, silty soil and a silty sand layer, the underground water level burial depth is 2.5m, pipelines are vertical and horizontal in the construction range and cannot be detached, a foundation reinforcement design with limited construction space adopts a gravel grouting steel pipe pile (GGP), the pile diameter is 600mm, the pile length is 33m, and the steel pipe is a welded pipe with the diameter of 500mm and the wall thickness of 8 mm);
the concrete construction process comprises the following steps:
drilling and cleaning: and (3) adopting a small impact drill to form holes, wherein the hole diameter of each formed hole is 600mm, and the hole depth of each formed hole is 33.1 m. The quality of the formed hole is checked after the hole is formed, the requirements that the diameter deviation is +/-20 mm, the verticality deviation is less than 1 percent and the hole forming depth is not less than the design depth are met. And (4) cleaning the drilled hole after the quality of the formed hole is checked, namely injecting dilute slurry into the hole to replace thick slurry in the hole, and stopping cleaning the hole when the specific gravity of the slurry is less than 1.15 and the sand content is less than 4%.
The steel pipe 4 is a welded pipe (formed by welding sectional steel pipes with the length of 3 m) with the wall thickness of 8 mm. Every meter of steel pipe is longitudinally spaced by 200mm and is provided with 5 groups (4 are equidistantly arranged on the circumference) of internal and external communicating holes 10 with the diameter of 8mm, the drill hole openings between two sections of segmented steel pipes 4 are welded and lengthened by adopting pull plates, the pull plates are symmetrically provided with 4 pieces, and the thickness of each pull plate is 10mm, and the width of each pull plate is 100 mm. And when the upper section and the lower section are welded, correcting the verticality of the steel pipe along two vertical directions by using a horizontal ruler. 1 group (3 are arranged on the circumference at equal intervals) of positioning rings 8 are welded on the outer part of the steel pipe 3 every 3m, and the steel pipe is ensured to be positioned in the center of a drill hole after being placed in the drill hole.
The positions of the primary grouting pipe 1, the pile top secondary grouting pipe 2 and the pile end secondary grouting pipe 3 are shown in figure 3, the primary grouting pipe 1 extends out of the bottom of the steel pipe 3 by 100mm, the bottom of the pile top secondary grouting pipe 2 is arranged 2m below the top surface of the steel pipe 4, and the pile end secondary grouting pipe 3 extends out of the bottom of the steel pipe 3 by 200 mm. The distance between the grouting pipe ends is 60mm within the length range of 150mm, the grout outlets with the diameter of 8mm are arranged in three rows, each row is 2, the pipe bottom plugs 14 are welded to seal the bottoms, the grout outlets 11 are sealed by two layers of high-pressure adhesive tapes 12, and then 2 layers of transparent adhesive tapes 13 are coated to protect the grout outlets.
Filling broken stones by a water returning method: the particle size of the broken stone is 5-20mm, the mud content is less than or equal to 1.0 percent, the mud block content is less than or equal to 0.5 percent, and the needle and flake content is less than or equal to 15 percent. When filling in the rubble, through one-time slip casting pipe 1 to the inboard and the outside injection clear water of steel pipe 4, the clear water flows out to the drill way from the hole bottom when filling in the rubble to guarantee that the downthehole rubble of stake can be closely knit. The filling speed of the crushed stones is controlled according to the filling height of not more than 1m in the drill hole per minute (the filling amount of the crushed stones per meter is about 400kg), and the final filling amount of the crushed stones is not less than 95 percent of the calculated amount of the volume of the drill hole.
Grouting for the first time: after filling the pile hole with the gravel, starting primary grouting, injecting first cement paste (water reducing agent 2%, expanding agent 8%, water cement ratio 0.8) into the inner side and the outer side of the steel pipe 4 until no mud flows out of the orifice of the drill hole provided with the gravel grouting steel pipe pile (GGP), and stopping grouting;
and (3) grouting for the second time: and (3) performing secondary grouting after the cement paste injected in the primary grouting is initially set, namely injecting second cement paste (2% of water reducing agent, 8% of expanding agent and 0.6% of water cement ratio) to the bottom of the steel pipe 4 and the vicinity of the pile top respectively through the pile top secondary grouting pipe 2 and the pile end secondary grouting pipe 3 until the grouting pressure is 5-8 MPa, and stopping grouting after the cement paste is stabilized for 3-5 min. And during the second grouting, injecting second cement paste to the position near the pile end through the pile end secondary grouting pipe 3, and injecting the second cement paste to the position near the pile top through the pile top secondary grouting pipe 2 after the grouting pressure meets the requirement, and stopping grouting until the grouting pressure meets the requirement.
According to the standard of the building foundation pile detection technical specification JGJ106-2014, a field load test is carried out, the vertical bearing capacity characteristic value of the gravel grouting steel pipe pile (GGP) can reach 1600KN, and the horizontal bearing capacity characteristic value can reach 180KN (the vertical bearing capacity of the bored pile with the site diameter of 600mm and the pile length of 35m is 1200-1250 KN, and the horizontal bearing capacity is 80-85 KN).
According to the embodiment, the gravel grouting steel pipe pile (GGP) can be adopted in a common building construction site, can also be adopted when a foundation of a building foundation is reinforced when the space is limited, and meanwhile, the gravel grouting body is arranged on the inner side and the outer side of the steel pipe to form protection on the steel pipe, so that the steel pipe can be effectively prevented from being rusted; through setting up the slip casting pipe and secondary slip casting pipe, guarantee rubble slip casting steel-pipe pile (GGP) can carry out twice slip casting at the work progress, and the grout accessible infiltration of the second time injection, splitting effect get into pile end and pile week soil body, make the soil body in the pile week uniform thickness participate in the pile body atress, improved rubble slip casting steel-pipe pile (GGP) bearing capacity, its vertical bearing capacity has improved 20 ~ 30% than same diameter drilling bored concrete pile.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A gravel grouting steel pipe pile is characterized by comprising a primary grouting pipe (1), a pile top secondary grouting pipe (2), a pile end secondary grouting pipe (3), a steel pipe (4), a steel pipe outer gravel grouting consolidation body (5), a steel pipe inner gravel grouting consolidation body (6), a pile periphery soil body (7), a positioning ring (8), a pipe end grouting device (9) and inner and outer communication holes (10).
2. A stone-crushed grouting steel pipe pile according to claim 1, characterised in that the wall thickness of the steel pipe (4) is greater than or equal to 6 mm;
the steel pipe (4) consists of segmented steel pipes; the length of the segmented steel pipe is 3-6 m;
the pipe wall of the segmental steel pipe is provided with an inner communication hole and an outer communication hole (10).
3. A stone-crushed grouting steel pipe pile according to claim 1 or 2, characterised in that the diameter of the inner and outer communication holes (10) is 8 mm;
the maximum vertical distance between the adjacent inner and outer communicating holes (10) in the radial direction perpendicular to the steel pipe (4) is 200 mm;
the number of the inner and outer communicating holes (10) in the circumferential direction at the same vertical height of the steel pipe (4) is more than or equal to 4.
4. A stone-grouted steel pipe pile according to claim 1, characterised in that the maximum vertical distance between adjacent positioning rings (8) in a direction perpendicular to the radial direction of the steel pipe (4) is 3000 mm;
the number of the positioning rings (8) in the circumferential direction at the same vertical height of the steel pipe (4) is 3.
5. A stone-crushed grouting steel pipe pile according to claim 1, characterised in that the number of the primary grouting pipes (1) is 2; the number of the pile top secondary grouting pipes (2) is 1; the number of the pile end secondary grouting pipes (3) is 2;
the primary grouting pipe (1), the pile top secondary grouting pipe (2) or the pile end secondary grouting pipe (3) is arranged on the inner wall of the steel pipe (4);
the primary grouting pipe (1), the pile top secondary grouting pipe (2) and the pile end secondary grouting pipe (3) are arranged at intervals in the circumferential direction of the same vertical height.
6. A gravel-grouted steel pipe pile according to claim 1 or 5, characterized in that the length of the primary grouting pipe (1) extending out of the bottom of the steel pipe (4) is more than or equal to 100 mm; the length of the pile end secondary grouting pipe (3) extending out of the bottom of the steel pipe (4) is more than or equal to 200mm, and the bottom end of the pile top secondary grouting pipe (2) is located 2m below the top of the steel pipe (4);
the length of the primary grouting pipe (1) extending out of the bottom of the steel pipe (4) is smaller than the length of the pile end secondary grouting pipe (3) extending out of the bottom of the steel pipe (4).
7. The gravel-grouted steel pipe pile according to claim 1, wherein the gravel in the steel pipe external gravel grouting consolidation body (5) or the steel pipe internal gravel grouting consolidation body (6) has a particle size of 5 to 20 mm;
the preparation raw materials of the steel pipe external gravel grouting consolidation body (5) or the steel pipe internal gravel grouting consolidation body (6) are independently gravel grouting consolidation bodies;
the gravel grouting consolidation body comprises gravel and cement paste; the water-cement ratio of the cement paste is 0.6-0.8.
8. The crushed stone-grouted steel pipe pile according to claim 1, wherein the pipe-end grouting device (9) is provided at pipe bottom ends of the primary grouting pipe (1), the pile-top secondary grouting pipe (2), and the pile-end secondary grouting pipe (3);
the pipe end grouting device (9) is respectively integrated with the primary grouting pipe (1), the pile top secondary grouting pipe (2) or the pile end secondary grouting pipe (3);
the pipe end grouting device (9) comprises a grout outlet (11), a high-pressure adhesive tape (12), a transparent adhesive tape (13) and a pipe bottom plug (14).
9. The method for manufacturing a gravel-grouted steel pipe pile according to any one of claims 1 to 8, characterized by comprising the steps of:
drilling and cleaning holes at the selected position of the broken stone grouting steel pipe pile, putting a steel pipe (4) provided with a primary grouting pipe (1), a pile top secondary grouting pipe (2), a pile end secondary grouting pipe (3) and a positioning ring (8), and positioning in the drilled hole through the positioning ring (8);
and filling broken stones on the inner side and the outer side of the steel pipe (4) by a water return method, then sequentially carrying out primary grouting and secondary grouting, and solidifying cement paste to obtain the broken stone grouting steel pipe pile.
10. The manufacturing method according to claim 9, wherein the water returning method is to fill crushed stones and simultaneously inject clean water to the inner side and the outer side of the steel pipe (4) through a primary grouting pipe (1);
the first grouting is to inject first cement paste into the inner side and the outer side of the steel pipe (4) through a primary grouting pipe (1) until no mud flows out of an orifice of a drill hole of the steel pipe pile provided with gravel grouting, and stopping grouting; the water-cement ratio of the first cement slurry is 0.8;
and the secondary grouting is to sequentially inject second cement paste to the inner side and the outer side of the steel pipe (4) near the bottom and the top of the steel pipe (4) through a pile end secondary grouting pipe (3) and a pile top secondary grouting pipe (2) until the grouting pressure is 5-8 MPa, and stop grouting after stabilizing for 3-5 min, wherein the water cement ratio of the second cement paste is 0.6.
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