CN111877327A - Grouting spiral steel pile for foundation stabilization and pile planting method thereof - Google Patents
Grouting spiral steel pile for foundation stabilization and pile planting method thereof Download PDFInfo
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- CN111877327A CN111877327A CN202010849624.6A CN202010849624A CN111877327A CN 111877327 A CN111877327 A CN 111877327A CN 202010849624 A CN202010849624 A CN 202010849624A CN 111877327 A CN111877327 A CN 111877327A
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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
- E02D5/56—Screw piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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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
- E02D5/72—Pile shoes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
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Abstract
The invention discloses a grouting spiral steel pile for foundation stabilization, which comprises a pile rod, wherein the pile rod is a steel pipe, the top of the pile rod is provided with a first interface, the first interface is connected with a power output end of rotary driving equipment through a connecting structure, the bottom of the pile rod is a pile tip, the outer rotary surface of the pile rod is provided with a spiral blade, and the pile tip is provided with a plurality of slurry outlet holes communicated with the pile rod; the power output end of the rotary driving device is connected to the grouting pipe. In the invention, built-in grouting pipes can be arranged in the pile rod to complete the connection, screw-in and grouting of all spiral steel piles, the grouting is stopped when cement grout returns to the ground from the wall of the pile hole, the connection between the rotary driving device and the uppermost section of steel pile is loosened, the built-in grouting pipes are locked by using a lock, the rotary driving device is lifted to pull out all the built-in grouting pipes, and the built-in grouting pipes are disassembled and cleaned for reuse. The resistance of the pile body in the process of pile planting in the spinning process is reduced, and the bearing capacity of the spiral steel pile is improved.
Description
Technical Field
The invention relates to a spiral steel pile for reinforcing a foundation, in particular to a grouting spiral steel pile.
Background
Foundations often face several problems for several reasons: 1) bearing capacity and stability problems; 2) compression and differential settlement problems; 3) leakage problems; 4) problems with liquefaction; 5) special soil is a special problem. When one or more of the five problems of the natural foundation exist, foundation treatment measures are needed to ensure the safety and normal use of the superstructure.
At present, in the field of foundation treatment and reinforcement in China, concrete pile bodies mainly made of cement binding materials are mainly applied to small piles. Because the concrete material exerts the slow reason of intensity, can't satisfy some special engineering requirements. Some precast piles are increasingly widely used because they avoid the problem of cast-in-place construction. Steel piles, which are one type of precast piles, are also used for foundation reinforcement in many fields.
The spiral steel pile is introduced into China in the early 90 s of the 20 th century, and the application in the field of photovoltaic power stations is more. The novel screw driver has the advantages of no need of earth excavation, direct screwing, lowest ecological damage, capability of directly bearing load and the like. Usually, the spiral steel pile is provided with a plurality of blades to achieve the purposes of no waste soil generation during use and labor saving during screwing. However, since the spiral steel pile is directly screwed into the soil, the disturbance to the soil around the pile providing the bearing capacity is huge, the disturbed soil around the pile needs a long time to recover and is difficult to completely recover to the original structural state, and in addition, the spiral steel pile is difficult to screw in the harder soil layer. Therefore, for the popularization and the use of the spiral steel pile, the problems of disturbance to soil and construction to harder soil layers in the screwing process must be solved.
At present, the reinforcement of the existing buildings is increased year by year, for example, the existing multi-storey buildings are additionally provided with elevator shaft structure foundations, the foundation reinforcement and reconstruction of old residential districts, the reinforcement of bridges, road embankments and side slopes and other construction sites need to be carried out the reinforcement of foundations and foundations so as to improve the strength and the stability of the foundations, and the reinforcement of the foundation is often required to be carried out the piling or the pile planting operation. The spiral steel pile is one of pile types for reinforcing foundation, and is formed from cylindrical steel pipe and one or several spiral blades which are vertically winded round the steel pipe (pile bar) and are independently arranged at intervals, and the pile-planting mode adopts rotary pile body and utilizes the spiral blades to make spinning and inserting into soil. In the process of steel pile burying, because helical blade is to the disturbance of the soil body around, must make the intensity that is located the soil body around the steel pile reduce to some extent, at the in-process that the steel pile buried, in case meet closely knit sand bed, then the burying of steel pile is more difficult.
Disclosure of Invention
Aiming at the prior art, the invention provides a grouting spiral steel pile for foundation reinforcement and a pile planting method thereof, thereby solving the problem that the pile planting of the spiral steel pile adopting the traditional structure is difficult. The bolt steel pile with the structure reduces the resistance of the pile body to be spun into the soil on one hand and fills the soil mass at the pile end on the side of the pile with cement slurry on the other hand to improve the strength of the soil mass and greatly improve the bearing capacity of the spiral steel pile in the pile planting process.
In order to solve the technical problems, the invention provides a grouting spiral steel pile for foundation reinforcement, which has the basic technical scheme that the grouting spiral steel pile comprises a pile rod, wherein the pile rod is a steel pipe, the top of the pile rod is provided with a first interface, the first interface is connected with a power output end of a rotary driving device through a connecting structure, the bottom of the pile rod is a pile tip, the outer rotary surface of the pile rod is provided with a spiral blade, and the pile tip is provided with a plurality of slurry outlet holes communicated with the pile rod; the power output end of the rotary driving device is connected to the grouting pipe.
Further, another technical scheme of the grouting spiral steel pile is that a built-in grouting pipe is arranged in the pile rod, a first connector of the pile rod is provided with internal threads, and the upper end of the built-in grouting pipe is provided with external threads; the output end of the rotary driving device is fixed with the upper end of an adapter, and the lower end of the adapter is simultaneously connected with the built-in grouting pipe and the first interface of the pile rod; the bottom of the built-in grouting pipe is positioned above the pile tip, a grout stop plug is arranged between an outer revolution surface at the bottom end of the built-in grouting pipe and an inner revolution surface of the pile rod, and all grout outlets are positioned below the grout stop plug; and a support ring is arranged between the upper end of the pile rod and the upper end of the built-in grouting pipe, and the support ring and the grout stopping plug are used for keeping the built-in grouting pipe and the pile rod coaxial.
The invention also comprises N sections of steel pile lengthening sections, each section of steel pile lengthening section comprises a lengthening section pile rod and a helical blade arranged on the outer rotating surface of the pile rod, and both ends of each section of steel pile lengthening section are in threaded connection with the connected steel pile lengthening section or helical steel pile.
Meanwhile, the invention also provides a pile planting method of the grouting spiral steel pile, pile planting equipment comprises a drilling machine with rotary driving equipment and a grouting pump, and the step of implanting is as follows:
step one, adjusting a drilling angle after the drilling machine with the rotary driving equipment is in place; aligning the pile tip of the spiral steel pile to a design position, connecting the top of the pile rod of the spiral steel pile with the power output end of a rotary driving device, and mixing cement slurry according to the cement mixing amount and the water cement ratio required by the design; determining the drilling speed of the spiral steel pile and the grouting flow rate of the grouting pump;
step two, starting a grouting pump to enable cement slurry to be sequentially conveyed to a pile tip at the bottom of the pile rod along a grouting pipe and a pile rod inner cavity which are connected with the grouting pump, and enabling the cement slurry to flow out of a slurry outlet; at the moment, the rotary driving equipment is started to enable the spiral steel pile to rotate and drill at a set drilling speed, the spiral blades are screwed into the soil, cement slurry is continuously injected according to a set grouting flow rate while screwing in, the grouting pressure is gradually and stably increased, and the grouting pump is stopped when the top of the spiral steel pile is drilled to be close to the ground along with the drilling; controlling the rotary driving equipment to rotate reversely, and loosening the connection between the rotary driving equipment and the top of the spiral steel pile; and the rotary driving device and the output end are lifted upwards by a certain height;
step three, taking a section of steel pile lengthening section, firmly connecting the bottom end of the pile rod of the section of steel pile lengthening section with the top end of the previous section of pile rod, and connecting the rotary driving equipment with the top end of the pile rod of the section of steel pile lengthening section; returning to the step two, completing the connection, the screwing-in and the grouting of all the spiral steel piles;
step four, continuing to keep grouting, stopping grouting by a grouting pump when cement grout returns to the ground from the pile hole wall, controlling the rotary driving equipment to rotate reversely, and loosening the connection between the rotary driving equipment and the top of the spiral steel pile;
and fifthly, putting graded gravel and cement slurry in the inner cavity of the pile rod into the pile rod, tamping to form concrete so as to improve the vertical compression resistance of the pile rod, completing the construction of one spiral steel pile, removing the equipment, and performing the pile planting construction of the next spiral steel pile.
If the implantation method of the spiral steel pile with the built-in grouting pipe in the pile rod is different from the basic method, the implantation method only comprises the following steps:
in the first step, the power output end of a rotary driving device is connected with a pile rod and a built-in grouting pipe of a spiral steel pile through an adapter, the adapter is fixed with the rotary driving device, and the adapter is in threaded connection with the pile rod and the built-in grouting pipe of the spiral steel pile;
in the second step, after stopping grouting by the grouting pump, controlling the rotary driving equipment to rotate reversely, and loosening the connection between the adapter and the top of the spiral steel pile and the built-in grouting pipe; and the output end of the rotary driving device is lifted upwards by a certain height;
in the third step, the bottom ends of the pile rod and the built-in grouting pipe of the lengthened section of the steel pile are respectively and firmly connected with the top ends of the pile rod and the built-in grouting pipe of the previous section of the steel pile, and the pile rod and the top ends of the built-in grouting pipes of the lengthened section of the steel pile are both connected with the lower end of the adapter, namely in the lengthened sections of the steel pile which are axially connected, the pile rod of the lengthened section and the built-in grouting pipe of the lengthened section are mutually and independently connected in the axial direction;
and in the fourth step, after the loosening conversion joint is connected with the lengthened section of the uppermost steel pile, the built-in grouting pipes of the lengthened section in the lengthened section of the uppermost steel pile are locked by using the lock, the lock is connected with the rotary driving device, the rotary driving device is lifted to pull out all the built-in grouting pipes, the built-in grouting pipes are disassembled, and the steel pile is washed clean by using clean water for reuse.
And fifthly, pouring concrete into the pile rod according to design requirements to improve the vertical compressive property of the pile rod, completing the construction of one spiral steel pile, removing the equipment, and performing the pile planting construction of the next spiral steel pile.
Compared with the prior art, the invention has the beneficial effects that:
according to the bolt steel pile with the structure, in the pile planting process, a steel pipe (pile rod) central channel is utilized or a grouting pipeline (namely a built-in grouting pipe) is independently arranged, a pile tip is provided with a grouting hole, cement grout with a certain water cement ratio is continuously injected in the pile body spinning-in process, the injection flow of the cement grout is matched with the spinning-in speed of pile soil, and the injected cement grout can soften a hard soil layer possibly met by the pile tip, so that the pile body can be smoothly implanted; cement slurry permeates into the pile surrounding soil layer damaged and disturbed by screwing the helical blades, and the soil layer is solidified and reinforced, so that the bearing capacity of the pile is improved; because cement slurry is injected in the pile planting process, soil around the pile is softened during pile planting, the effect of soil squeezing during pile body planting is further reduced, and the influence on the foundation of the nearby building is further reduced; the pile bearing capacity fully utilizes the shearing friction resistance effect of the column body formed by the helical blades and the cement reinforced soil between the helical blades on the foundation soil at the outer side, so that less steel is used to obtain higher bearing capacity, and the energy-saving effect is obvious; the pile planting process has no pollution such as soil discharge, slurry discharge and the like, and is green and environment-friendly.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a grouting spiral steel pile of the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of a grouting spiral steel pile of the present invention;
FIG. 3 is a schematic structural view of a helical blade of the helical steel pile;
FIG. 4 is a schematic structural view of another helical blade of the helical steel pile;
fig. 5 is a schematic structural view of an elongated section of a steel pile according to the present invention.
In the figure:
1-slip casting pipe 2-rotation driving device
3-first interface 4-helical blade
5-pile rod 6-grout outlet
7-pile tip 8-ground
9-stop-grouting plug 10-built-in grouting pipe
11-support ring 12-adapter
13-ring piece 51-lengthening section pile rod
52-extension section built-in grouting pipe 53-upper support ring
54-lower support ring
Detailed Description
The design idea of the grouting spiral steel pile is that one or more grout outlet holes are formed in the pile tip of the bottom of the pile rod of the spiral steel pile on the premise of meeting the requirements of rigidity and strength, when the pile is planted, the pile rod is rotated and pressure is applied along the pile rod, cement grout is injected into the pile rod from the pile top in the steel pile implanting process by matching with a grouting pipe, namely, the cement grout is injected into the pile bottom while the pile body is spun into the soil, and the cement grout is sprayed out from the grout outlet holes of the pile tip, so that the resistance of spinning into the soil of the pile body is reduced, and on the other hand, the cement grout fills a gap formed by the spiral blade rotating to damage the soil body on the pile side, and the soil body on the pile side is reinforced, so that the strength of the soil body is improved, and the bearing capacity of the spiral steel pile is greatly improved.
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
Example one
As shown in fig. 1, the grouting spiral steel pile for foundation stabilization provided by the invention comprises a pile rod 5, wherein the pile rod 5 is a steel pipe, a first connector 3 is arranged at the top of the pile rod 5, the first connector 3 is connected with a power output end of a rotary driving device 2 through a connecting structure, a pile tip 7 is arranged at the bottom of the pile rod 5, a spiral blade 4 is arranged on the outer rotary surface of the pile rod 5, and a plurality of slurry outlet holes 6 communicated with the pile rod 5 are arranged at the position of the pile tip 7; the power output end of the rotary driving device 2 is connected to the grouting pipe 1.
The steel pile lengthening structure is characterized by further comprising N sections of steel pile lengthening sections, each section of steel pile lengthening section comprises a lengthening section pile rod 51 and a helical blade 4 arranged on the outer rotating surface of the pile rod 51, and two ends of each section of steel pile lengthening section are in threaded connection with the connected steel pile lengthening section or the helical steel pile.
The pile planting equipment comprises rotary driving equipment 2 and a grouting pump, wherein the rotary driving equipment 2 is a rotary power device of a drilling machine, and the pile planting method for grouting the spiral steel pile comprises the following steps:
step one, adjusting a drilling angle after the drilling machine with the rotary driving equipment 2 is in place; aligning the pile tip 7 of the spiral steel pile to a design position, connecting the top of the pile rod 5 of the spiral steel pile with the power output end of the rotary driving device 2, and mixing cement slurry according to the cement mixing amount and the water cement ratio required by the design, wherein the cement mixing amount is the percentage of the natural weight of the reinforced soil and can be selected within the range of 12-40%, and the reinforced soil refers to a soil column with the diameter within the range of the diameter of the spiral blade on the outer side of the pile rod and the length equal to the length of the pile. The water cement ratio is the weight ratio of water to cement and can be selected within the range of 0.4-2.0, the dosage of the cement slurry comprises the dosage of the cement slurry filled in the inner cavity of the pile rod 5, and the volume of the single-pile cement slurry is measured. And determining that the drilling speed of the spiral steel pile can be selected between 0.2-1.0 m/min, and setting the unit time flow of the grouting pump.
Step two, starting the grouting pump to enable cement slurry to be sequentially conveyed to a pile tip 7 at the bottom of the pile rod 5 along a grouting pipe 1 and an inner cavity of the pile rod 5 connected with the grouting pump, and ejecting the cement slurry from a slurry outlet hole 6; at the moment, the rotary driving device 2 is started to enable the spiral steel pile to rotate and drill at a set drilling speed, the spiral blade 4 is screwed into the soil, cement slurry is continuously injected according to a set grouting flow rate while screwing in, the grouting pressure is gradually and stably increased, and grouting of a grouting pump is stopped when the top of the spiral steel pile is drilled to be close to the ground along with drilling; controlling the rotary driving device 2 to rotate reversely, loosening the connection between the rotary driving device 2 and the top of the spiral steel pile, and lifting the rotary driving device 2 and the output end upwards by a certain height;
and step three, taking a section of steel pile lengthening section, firmly connecting the bottom end of a pile rod 51 of the section of steel pile lengthening section with the top end of a pile rod 5 of a first section of spiral steel pile, moving the rotary driving equipment 2 upwards or downwards, properly connecting a power output end of the rotary driving equipment with the top end of a pile rod 51 of a second section of spiral steel pile (steel pile lengthening section), starting a grouting pump again, observing grouting pressure and flow, ensuring that the grouting pressure is not increased sharply and the flow is stable, ensuring that the bottom grout outlet hole 6 is smooth, continuously rotating and propelling the spiral steel pile to screw in according to a set drilling speed, and further continuously connecting a third section, a fourth section and … … nth section of spiral steel piles, and completing connection, screwing in and grouting of all spiral steel piles.
Continuing grouting until cement grout returns to the ground from the wall of a pile hole (namely the diameter range of the spiral blade 4 on the outer side of the pile rod), stopping grouting, controlling the rotary driving equipment 2 to rotate reversely, loosening and disassembling the connection between the rotary driving equipment 2 and the top of the spiral steel pile;
and fifthly, putting graded gravel and cement slurry in the inner cavity of the pile rod into the pile rod, tamping to form concrete so as to improve the vertical compression resistance of the pile rod, completing the construction of one spiral steel pile, removing the equipment, and performing the pile planting construction of the next spiral steel pile.
Example two
As shown in fig. 2, the spiral steel pile of the second embodiment is configured in such a manner that, on the basis of the first embodiment, a built-in grouting pipe 10 is arranged in the pile rod 5, the first connector 3 of the pile rod 5 is provided with internal threads, and the upper end of the built-in grouting pipe 10 is provided with external threads; the output end of the rotary driving device 2 is fixed with the upper end of a conversion joint 12, and the lower end of the conversion joint 12 is simultaneously connected with the built-in grouting pipe 10 and the first interface 3 of the pile rod 5; the bottom of the built-in grouting pipe 10 is positioned above the pile tip 7, a grout stop plug 9 is arranged between the outer revolution surface of the bottom end of the built-in grouting pipe 10 and the inner revolution surface of the pile rod 5, and all the grout outlet holes 6 are positioned below the grout stop plug 9; a support ring 11 is arranged between the upper end of the pile rod 5 and the upper end of the built-in grouting pipe 10, and the support ring 11 and the grout stop plug 9 are used for keeping the built-in grouting pipe 10 coaxial with the pile rod 5.
In the second embodiment, the built-in grouting pipe 10 is arranged in the pile rod 5, and the grout stop plug 9 is arranged between the built-in grouting pipe 10 and the pile rod 5, so that the use amount of cement grout can be saved by implementing grouting, the pile rod 5 is kept not to be filled with the cement grout, and the built-in grouting pipe 10 is used for grouting under the condition that the spiral steel pile is repeatedly used, so that the cement grout is not contained in the pile rod 5, the built-in grouting pipe 10 and the pile rod 5 can be smoothly pulled out, and the repeated use of the spiral steel pile is realized. In addition, if the built-in grouting pipe 10 is pulled out according to the design requirement, the concrete can be poured into the pile rod 5 to form a steel pipe concrete structure.
The second embodiment may also include N sections of steel pile extension sections, each section of steel pile extension section includes an extension section pile rod 51 and an extension section built-in grouting pipe 52, an upper support ring 53 and a lower support ring 54 are arranged between the extension section pile rod 51 and the extension section built-in grouting pipe 52, and the upper support ring 53 and the lower support ring 54 are used for keeping the extension section pile rod 51 and the extension section built-in grouting pipe 52 coaxial; the upper end of each lengthening section pile rod 51 is provided with an internal thread, the lower end of each lengthening section pile rod 51 is provided with an external thread, the upper end of each lengthening section built-in grouting pipe 52 is provided with an external thread, and the lower end of each lengthening section built-in grouting pipe 52 is provided with an internal thread; in the multiple axially connected steel pile extension sections, the extension section pile rod 51 and the extension section built-in grouting pipe 52 are axially and independently connected.
In order to pull out all the support rings (including the support ring 11, the upper support ring 53, the lower support ring 54 and the grout stop plug 9, as shown in fig. 2 and 5) together while the built-in grouting pipe is pulled out after the pile is planted, annular sheets 13 are fixed on the built-in grouting pipe 10 above and below the grout stop plug 9; the outer diameter of the ring segment 13 is smaller than the inner diameter of the pile rod 5.
The pile planting equipment in the pile planting method in the second embodiment is the same as that in the first embodiment, and comprises a rotary driving device 2 and a grouting pump, wherein the rotary driving device 2 is a rotary power device of a drilling machine, the conversion joint 12 in the second embodiment is used for realizing the connection of the rotary driving device 2 and a spiral steel pile (such as a first spiral steel pile shown in fig. 2 or a multi-section steel pile extension section which is subsequently connected as shown in fig. 5), the upper end of the conversion joint 12 is connected with the rotary driving device 2, the lower end of the conversion joint 12 is provided with external threads and internal threads, the external threads at the lower end of the conversion joint 12 are connected with the internal threads of a pile rod 5 of the first spiral steel pile or an extension section pile rod 51 of the steel pile extension section, and the internal threads at the lower end of the conversion joint 12 are connected with the external threads of an internal grouting pipe 10 or an internal grouting pipe 52 of the extension section. In the second embodiment, the supporting ring 11, the grout stop plug 9, the upper supporting ring 53 and the lower supporting ring 54 are all sleeved at corresponding positions on the built-in grouting pipe by using rubber rings, and the inner diameter and the outer diameter of the grout stop plug 9 are tightly matched with the outer rotating surface of the built-in grouting pipe 10 and the inner rotating surface of the pile rod 5.
The pile planting method of the grouting spiral steel pile of the second embodiment comprises the following steps:
firstly, sleeving a grout stop plug 9 and a support ring 11 on a built-in grouting pipe 10 of a first section of spiral steel pile, placing the built-in grouting pipe 10 into a pile rod 5, enabling the built-in grouting pipe 10 to be coaxial with the pile rod 5 through the support ring 11 and the grout stop plug 9, and adjusting a drilling angle after a drilling machine with rotary driving equipment 2 is in place; aligning the pile tip 7 of the first section of spiral steel pile to a design position, connecting the power output end of the rotary driving device 2 with the pile rod 5 and the built-in grouting pipe 10 of the spiral steel pile through an adapter 12, fixing the adapter 12 with the rotary driving device 2, and connecting the adapter 12 with the pile rod 5 and the built-in grouting pipe 10 of the spiral steel pile through threads; mixing cement slurry according to the designed cement mixing amount and the water-cement ratio (same as the first embodiment); the drilling rate of the spiral steel pile and the grouting flow rate of the grouting pump are determined (same as in the first embodiment).
Step two, starting a grouting pump to enable cement grout to be sequentially sent to the lower part of a grout stop plug 9 in an inner cavity of the pile rod 5 along a grouting pipe 1 connected with the grouting pump and a built-in grouting pipe 10 in the pile rod 5, and the cement grout is sprayed out from a plurality of grout outlet holes 6 at the bottom of the pile rod 5 and a pile tip 7; at the moment, the rotary driving device 2 is started to enable the spiral steel pile to rotate and drill at a set drilling speed, so that the spiral blade 4 is screwed into the soil, cement slurry is continuously injected according to a set grouting flow speed and flow while screwing in, the grouting pressure is gradually and stably increased, and the grouting is stopped when the top of the spiral steel pile is drilled to be close to the ground along with the drilling; controlling the rotary driving device 2 to rotate reversely, and loosening the connection between the adapter and the top of the spiral steel pile and the built-in grouting pipe; and the rotary driving device 2 and the output end are lifted upwards by a certain height;
hoisting a section of steel pile lengthening section (namely a second section of spiral steel pile), connecting the bottom end of the pile rod 51 and the bottom end of the built-in grouting pipe of the section of steel pile lengthening section with the pile rod of the previous section of steel pile and the top end of the built-in grouting pipe respectively and independently, and connecting the pile rod 51 and the top end of the built-in grouting pipe of the section of steel pile lengthening section with the lower end of the adapter; and (3) starting the grouting pump again, observing grouting pressure and flow, ensuring that the grouting pressure is not increased rapidly and the flow is stable, ensuring that the grout is discharged from the bottom grout outlet hole 6 smoothly, continuously rotating and propelling the spiral steel pile to screw in at a set drilling speed, and continuously connecting the third section, the fourth section, … … and the nth section of spiral steel pile to complete connection, screwing in and grouting of all the spiral steel piles.
Step four, continuing to keep grouting, stopping grouting by a grouting pump when cement grout returns to the ground from the pile hole wall, controlling the rotary driving equipment 2 to rotate reversely, and loosening the connection between the conversion joint and the uppermost section of the steel pile extension section; locking the built-in grouting pipes 52 of the extension section in the uppermost section of the steel pile extension section by using a lock, connecting the lock with the rotary driving device 2, lifting the rotary driving device 2 to pull out all the built-in grouting pipes 10, and pulling out all the support rings 11, the upper support rings 53, the lower support rings 54 and the grout stop plugs 9 together while pulling out all the built-in grouting pipes under the action of the annular sheets 13 on the built-in grouting pipes of the first section of spiral steel pile; disassembling the built-in grouting pipe 10, and washing the grouting pipe with clear water for repeated use; and then, completing the construction of one spiral steel pile, removing the equipment, and performing the pile planting construction of the next spiral steel pile.
In the second embodiment, after the internal grouting pipe 10 is pulled out, concrete can be poured into the pile rod according to requirements to form a steel pipe concrete structure, so as to improve the vertical compression resistance of the pile rod,
the spiral steel pile can be used for temporary diagonal bracing of side slopes and foundation pits. In particular, in the spiral steel pile described in the second embodiment, within the excavation depth range of the spiral steel pile entering the side slope and the foundation pit, clear water can be injected into the pile rod built-in grouting pipe to reduce the connection between the pile body and the surrounding soil body, cement grout is injected into the embedding depth range below the side slope and the foundation pit, and after the spiral steel pile completes the temporary support of the side slope and the foundation pit, the pile body exposed above the bottom of the side slope and the foundation pit is removed for reuse.
In the invention, after the pile body is completely buried, grouting is stopped and is stopped for a certain time, and secondary grouting can be carried out, so that the strength of the soil body at the bottom and the side of the pile is further enhanced.
The structural form of the helical blade in the present invention is not limited, and may be the structural form shown in fig. 3 or fig. 4, or may be another structural form.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (10)
1. The utility model provides a slip casting spiral steel pile for foundation stabilization, includes stake pole (5), stake pole (5) are the steel pipe, the top of stake pole (5) is equipped with first interface (3), first interface (3) link to each other with the power take off end of rotary driving equipment (2) through connection structure, the bottom of stake pole (5) is stake point (7), be equipped with helical blade (4), its characterized in that on the outer revolution surface of stake pole (5):
a plurality of grout outlet holes (6) communicated with the pile rod (5) are formed in the pile tip (7); the power output end of the rotary driving device (2) is connected to the grouting pipe (1).
2. The grouting spiral steel pile according to claim 1, characterized by further comprising N sections of steel pile extension sections, each section of steel pile extension section comprises an extension section pile rod (51) and a spiral blade (4) arranged on the outer rotating surface of the pile rod (5), and both ends of each section of steel pile extension section are in threaded connection with the connected steel pile extension section or spiral steel pile.
3. A method of placing a grouted spiral steel pile, the pile placing equipment comprising a drilling machine with a rotary driving device (2) and a grouting pump, characterized in that the step of placing the grouted spiral steel pile according to claim 1 is:
step one, adjusting a drilling angle after the drilling machine with the rotary driving equipment (2) is in place; aligning the pile tip of the spiral steel pile to a design position, connecting the top of the pile rod of the spiral steel pile with the power output end of the rotary driving device (2), and mixing cement slurry according to the cement mixing amount and the water cement ratio required by the design; determining the drilling speed of the spiral steel pile and the grouting flow rate of the grouting pump;
step two, starting a grouting pump to enable cement slurry to be sequentially conveyed to a pile tip (7) at the bottom of the pile rod along a grouting pipe (1) connected with the grouting pump and an inner cavity of the pile rod, and enabling the cement slurry to flow out of a slurry outlet hole (6); at the moment, the rotary driving device (2) is started to enable the spiral steel pile to rotate and drill at a set drilling speed, the spiral blade (4) is screwed into the soil, cement slurry is continuously injected at a set grouting flow rate while screwing in, the grouting pressure is gradually and stably increased, and the grouting pump is stopped when the top of the spiral steel pile is drilled to be close to the ground along with the drilling; controlling the rotary driving equipment (2) to rotate reversely, and loosening the connection between the rotary driving equipment (2) and the top of the spiral steel pile; the rotary driving device (2) and the output end are lifted upwards by a certain height;
step three, taking a section of the steel pile extension section in the spiral steel pile according to claim 2, firmly connecting the bottom end of the pile rod of the section of the steel pile extension section with the top end of the previous section of the pile rod, and connecting the power output end of the rotary driving device (2) with the top end of the pile rod of the section of the steel pile extension section; returning to the step two, completing the connection, the screwing-in and the grouting of all the spiral steel piles;
step four, continuing to keep grouting, stopping grouting by a grouting pump when cement grout returns to the ground from the pile hole wall, controlling the rotary driving equipment (2) to rotate reversely, and loosening the connection between the power output end of the rotary driving equipment (2) and the top of the spiral steel pile;
and fifthly, putting graded gravel and cement slurry in the inner cavity of the pile rod into the pile rod, tamping to form concrete so as to improve the vertical compression resistance of the pile rod, completing the construction of one spiral steel pile, removing the equipment, and performing the pile planting construction of the next spiral steel pile.
4. The grouting spiral steel pile according to claim 1, characterized in that a built-in grouting pipe (10) is arranged in the pile rod (5), the first connector (3) of the pile rod (5) is provided with internal threads, and the upper end of the built-in grouting pipe (10) is provided with external threads; the output end of the rotary driving device (2) is fixed with the upper end of a conversion joint (12), and the lower end of the conversion joint (12) is simultaneously connected with the built-in grouting pipe (10) and the first interface (3) of the pile rod (5); the bottom of the built-in grouting pipe (10) is positioned above the pile tip (7), a grout stop plug (9) is arranged between the outer revolution surface of the bottom end of the built-in grouting pipe (10) and the inner revolution surface of the pile rod (5), and all grout outlets (6) are positioned below the grout stop plug (9);
and a support ring (11) is arranged between the upper end of the pile rod (5) and the upper end of the built-in grouting pipe (10), and the support ring (11) and the grout stop plug (9) are used for keeping the built-in grouting pipe (10) coaxial with the pile rod (5).
5. The grouting spiral steel pile according to claim 4, characterized by further comprising N sections of steel pile extension sections, wherein each section of steel pile extension section comprises an extension section pile rod (51) and an extension section built-in grouting pipe (52), an upper support ring (53) and a lower support ring (54) are arranged between the extension section pile rod (51) and the extension section built-in grouting pipe (52), and the upper support ring (53) and the lower support ring (54) are used for keeping the extension section pile rod (51) and the extension section built-in grouting pipe (52) coaxial;
the upper end of each lengthening section pile rod (51) is provided with an internal thread, the lower end of each lengthening section pile rod (51) is provided with an external thread, the upper end of each lengthening section built-in grouting pipe (52) is provided with an external thread, and the lower end of each lengthening section built-in grouting pipe (52) is provided with an internal thread;
in the multiple sections of axially connected steel pile extension sections, the pile rod (51) of the extension section is mutually and independently connected with the built-in grouting pipe (52) of the extension section in the axial direction.
6. Grouting spiral steel pile according to claim 4, characterised in that on the built-in grouting pipe (10) above and below the stop-grouting plug (9) there is fixed one ring-shaped piece (13) each; the outer diameter of the annular sheet (13) is smaller than the inner diameter of the pile rod (5).
7. A method for placing a grouting spiral steel pile, the pile placing equipment comprising a drilling machine with a rotary driving device (2) and a grouting pump, characterized in that the step of placing the grouting spiral steel pile according to claim 4 is:
step one, adjusting a drilling angle after the drilling machine with the rotary driving equipment (2) is in place; aligning the pile tip of the spiral steel pile to a design position, connecting the power output end of the rotary driving device (2) with the pile rod and the built-in grouting pipe of the spiral steel pile through an adapter, wherein the adapter is fixed with the power output end of the rotary driving device (2), and the adapter is in threaded connection with the pile rod and the built-in grouting pipe of the spiral steel pile; mixing cement slurry according to the cement mixing amount and the water-cement ratio required by design; determining the drilling speed of the spiral steel pile and the grouting flow rate of the grouting pump,
step two, starting a grouting pump to enable cement slurry to be sequentially conveyed to a pile tip (7) at the bottom of the pile rod along a grouting pipe (1) connected with the grouting pump and a built-in grouting pipe (10) in the pile rod, and enabling the cement slurry to flow out of a slurry outlet hole (6); at the moment, the rotary driving device (2) is started to enable the spiral steel pile to rotate and drill at a set drilling speed, the spiral blade (4) is screwed into the soil, cement slurry is continuously injected at a set grouting flow rate while screwing in, the grouting pressure is gradually and stably increased, and the grouting pump is stopped when the top of the spiral steel pile is drilled to be close to the ground along with the drilling; controlling the rotary driving equipment (2) to rotate reversely, and loosening the connection between the adapter and the top of the spiral steel pile and the built-in grouting pipe; the rotary driving device (2) and the output end are lifted upwards by a certain height;
step three, taking a section of the steel pile lengthening section in the spiral steel pile according to claim 5, firmly connecting the bottom end of the pile rod and the built-in grouting pipe of the section of the steel pile lengthening section with the pile rod of the previous section of the steel pile and the top end of the built-in grouting pipe respectively, and connecting the pile rod of the section of the steel pile lengthening section and the top end of the built-in grouting pipe with the lower end of the adapter; returning to the step two, completing the connection, the screwing-in and the grouting of all the spiral steel piles;
step four, continuing to keep grouting, stopping grouting by a grouting pump when cement grout returns to the ground from the pile hole wall, controlling the rotary driving equipment (2) to rotate reversely, and loosening the connection between the adapter and the uppermost section of the steel pile extension section;
locking the built-in grouting pipes of the lengthened section in the uppermost section of the steel pile lengthened section by using a lock, connecting the lock with the rotary driving device (2), lifting the rotary driving device (2) to pull out all the built-in grouting pipes, and simultaneously pulling out all the support rings, the upper support rings, the lower support rings and the grout stop plugs together under the action of the annular sheets (13) in the spiral steel pile as claimed in claim 6; disassembling the built-in grouting pipe, and washing the grouting pipe with clear water for repeated use;
and fifthly, completing the construction of one spiral steel pile, removing the equipment, and performing the pile planting construction of the next spiral steel pile.
8. The pile planting method of the grouting spiral steel pile according to claim 7, wherein between the fourth step and the fifth step, concrete is poured into the pile rod according to design requirements to improve the vertical compression resistance of the pile rod.
9. A pile-planting method for grouting spiral steel piles as claimed in claim 3 or 7, wherein cement is added to the cement grout in an amount of 12 to 40% of the natural weight of the reinforced soil; the water cement ratio is the weight ratio of water to cement, and is 0.4-2.0.
10. The pile planting method for the grouting spiral steel pile as claimed in claim 3 or 7, wherein the drilling machine with the rotary driving device (2) drives the spiral steel pile to have a drilling speed of 0.2-1.0 m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010849624.6A CN111877327A (en) | 2020-08-21 | 2020-08-21 | Grouting spiral steel pile for foundation stabilization and pile planting method thereof |
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| CN202010849624.6A CN111877327A (en) | 2020-08-21 | 2020-08-21 | Grouting spiral steel pile for foundation stabilization and pile planting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233663A (en) * | 2022-09-06 | 2022-10-25 | 杭州联力地空建筑科技有限公司 | Pile sinking device for precast pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115233663A (en) * | 2022-09-06 | 2022-10-25 | 杭州联力地空建筑科技有限公司 | Pile sinking device for precast pile |
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