CN113373907B - Composite driving type snowflake type pile system and construction method - Google Patents
Composite driving type snowflake type pile system and construction method Download PDFInfo
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- CN113373907B CN113373907B CN202110690796.8A CN202110690796A CN113373907B CN 113373907 B CN113373907 B CN 113373907B CN 202110690796 A CN202110690796 A CN 202110690796A CN 113373907 B CN113373907 B CN 113373907B
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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
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
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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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- 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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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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
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
Abstract
The invention discloses a composite driving type snowflake type pile system and a construction method, wherein the system comprises a cement mixing pile outer core, a snowflake type steel sheet pile inner core, a guide assembly, a pile splicing device and a cement paste state monitoring system; the top of the snowflake type steel sheet pile inner core is provided with a pile cap, and the pile cap is connected with the bearing platform; when the outer core of the cement mixing pile exceeds the set length, the snowflake type steel sheet pile inner core is driven into the outer core of the cement mixing pile which is not initially set in a segmented pile connecting mode through the pile connecting device and the guide assembly. The invention combines the bearing characteristics of the cement mixing pile and the snowflake type steel sheet pile, makes up the conditions of insufficient side friction resistance and insufficient structural stability caused by relatively small volume of the high-strength steel sheet pile, and improves the bearing capacity of the pile body. The invention balances construction cost, enhances the bearing capacity of the pile body, has wide application range, is used for solving the problems of soft soil foundation reinforcement, foundation pit support and differential settlement of the bridge head, and has wide application prospect in the fields of bridges, foundation pits and roads.
Description
Technical Field
The invention relates to a wet cement mixing pile in buildings and rock and soil and a steel sheet pile in geological engineering, in particular to a composite driving snowflake type pile system and a construction method.
Background
Along with the high-speed development of the longitudinal direction and the transverse direction of a building, the stress state of the building is more complex, the requirement on the bearing characteristic is continuously improved, and a pile foundation needs to have the capabilities of resisting horizontal load and vertical load. Especially when the soft soil layer of the foundation is thick, the upper load of the building is large, the utilization of the foundation engineering is poor, deformation is easy to occur under the load effect, and integral settlement or local uneven settlement is caused. Moreover, the enclosure structure is required to be not allowed to crack in the building, and the restriction on the settlement is strict. Therefore, the building has extremely strong horizontal load resistance and vertical load resistance at the same time, and becomes a development direction with great prospect.
The soft soil foundation pit and the high-speed bridge head transition section often cause stability reduction due to the soft soil property, the bearing capacity of each soil layer cannot be fully utilized by the common pile body, sufficient side friction resistance cannot be provided, and even pile foundation instability can be generated. Meanwhile, the supporting layers in the soft soil area are distributed differently, the problem of unreasonable construction cost is easily caused by the pile length change of engineering requirements, and a composite pile combining the characteristics of a cement pile and a steel sheet pile needs to be researched urgently.
Disclosure of Invention
The invention aims to: the invention aims to provide a composite driving type snowflake type pile system and a construction method, which aim to solve the problem that a common pile body in the prior art cannot provide enough side friction resistance to cause instability of a pile foundation; and the distribution of the bearing stratum in the soft soil area causes the deficiency of pile length change of engineering requirements.
The technical scheme is as follows: the composite driving type snowflake type pile system comprises a cement mixing pile outer core, a snowflake type steel sheet pile inner core, a guide assembly, a pile splicing device and a cement paste state monitoring system;
the top of the snowflake type steel sheet pile inner core is provided with a pile cap, and the pile cap is connected with a bearing platform;
when the outer core of the cement mixing pile exceeds the set length, the snowflake type steel sheet pile inner core is driven into the outer core of the cement mixing pile which is not initially set in a segmented pile connecting mode through the pile connecting device and the guide assembly.
The guide assembly comprises a fixed support, a supporting rod and a positioning unit, and the supporting rod moves in the fixed support.
The positioning unit comprises an I-steel transverse rib, a first limiting plate, a second limiting plate and a slide rail device; the I-steel transverse ribs, the first limiting plate and the second limiting plate are used for fixing the snowflake type steel sheet pile inner core through the sliding rail device.
The slide rail device comprises a plurality of slide rail units symmetrically fixed on the transverse ribs of the I-shaped steel, each slide rail unit comprises a first guide rail, a central rail and a second guide rail, and the central rails are connected through the first guide rails and the second guide rails.
The pile splicing device comprises a pile splicing ring and a tightening nut, wherein a pile groove for fixing the snowflake type steel sheet pile inner core is formed in the pile splicing ring.
The cement paste state monitoring system comprises a concrete water content detector and an air humidity sensor.
The gypsum powder is added into the outer core of the cement mixing pile, so that the impermeability of the cement mixing pile is improved, and the snowflake type steel sheet pile inner core is protected from corrosion.
The snowflake type steel sheet pile inner core is driven into the cement mixing pile outer core in a long core, short core or equal core mode.
The construction method of the composite driving type snowflake type pile system comprises the following steps:
(1) carrying out leveling treatment on the site of the pile, setting pile positions and pile distances and carrying out fixed-point marking;
(2) moving a cement mixer to a specified pile manufacturing position, centering and adjusting, wherein the positioning error between the drilling center point of the mixer and the center point of a pile body is less than or equal to 2.5cm, detecting whether a main arm of a drilling machine is vertical, and adjusting a drill rod to enable the verticality deviation of the drill rod to be less than or equal to 1%;
(3) mixing the slurry, and adding gypsum powder for anticorrosion protection of the snowflake type steel sheet pile inner core into the cement;
(4) starting a cement mixer, drilling at a positioning point, sinking, and stirring to form a hole; after the designed depth is reached, a high-pressure grouting pump is started, reverse circulation drilling is started, and slurry is sprayed; when the deep layer stirring machine is lifted to 0.8-1m below the ground, slowly lifting and stirring, when the deep layer stirring machine is lifted to 0.2-0.4m away from the ground, stopping spraying the slurry, and stirring for several seconds to ensure that the pile body is compact;
(5) after preliminary stirring, detecting grout by using a concrete water content detector and an air humidity sensor, stopping lifting when a grout spraying opening reaches the elevation of the pile top, stirring for several seconds, and finally, ensuring that the pile position deviation of a formed pile is less than or equal to 5cm and the perpendicularity deviation of a pile body is less than or equal to 1.5%;
(6) if stopping slurry for reasons in the construction process, lifting the stirring head to a position 0.5m above a slurry stopping point, and stirring and lifting after the slurry supply is resumed and the stirring sinks to a position below 1m of the slurry stopping position;
(7) when the cement mixing pile is not initially set, preparing to insert the snowflake type steel sheet pile inner core;
(8) fixing a fixed support at a pile point, placing the snowflake type steel sheet pile inner core in a positioning unit, limiting the position and the angle of the snowflake type steel sheet pile by adopting a sliding rail device, aligning the pile tip of the steel sheet pile inner core to the center of a cement mixing pile through a guide assembly, and vertically inserting the snowflake type steel sheet pile inner core into the cement mixing pile outer core which is not initially set through the self weight of the snowflake type steel sheet pile inner core;
(9) if the piles are not connected in sections, controlling the inner core of the snowflake type steel sheet pile to be driven into the outer core of the cement mixing pile to the designed depth, and enabling the snowflake type steel sheet pile to enter the bearing layer for 0.8-1 m; the pile cap and the snowflake type steel sheet pile inner core are connected into a whole through a flange, and the snowflake type steel sheet pile inner core is further driven into the cement mixing pile outer core;
(10) if the pile is spliced in sections, driving a first section of inner core in the inner core assembly to the reserved length of the spliced pile, fixing a second section of inner core through a pile splicing ring, splicing the pile by welding two sides, and staggering joints; after the welding is finished, polishing the welding line, welding the reinforcing plate again, and polishing the welding line again; driving the inner core assembly again; and repeating the operation until the inner core assembly is driven into the designed depth, and connecting the pile cap through the flange.
In the step (8), a power supply is switched on, two I-shaped steel transverse ribs are longitudinally moved through a sliding rail device, and two sides of the snowflake type steel sheet pile inner core are clamped; the first limiting plate and the second limiting plate are moved through the sliding rail device, the included angles of the first limiting plate, the second limiting plate and the transverse I-steel rib are set to be 60 degrees, and the snowflake-shaped steel pipe pile inner core is clamped.
The working principle is as follows: the composite driving-in snowflake type pile system comprises two steps of processing the outer core of the cement mixing pile and connecting the inner core of the snowflake type steel sheet pile during construction, wherein after the outer core of the cement mixing pile is formed through a wet cement mixing process, the inner core of the snowflake type steel sheet pile is driven into cement which is not condensed by using pile sinking equipment, and finally the composite driving-in snowflake type pile system with the outline of the cement mixing pile and the built-in snowflake type steel sheet pile is formed.
Add snowflake type steel sheet pile inner core in cement mixing pile outer core for the pile body structure is more three-dimensional, and pile body horizontal bearing capacity and vertical bearing capacity all increase by a wide margin, have horizontal resistance and bending resistance concurrently.
The length ratio of the snowflake type steel sheet pile inner core and the cement mixing pile outer core is adjusted according to the soil layer condition, and the snowflake type steel sheet pile inner core and the cement mixing pile outer core are divided into three combination forms of short cores, equal cores and long cores; meanwhile, the snowflake type steel sheet pile inner core adopts a sectional pile splicing treatment mode, and the structural stability is improved.
The invention is provided with the guide component during construction, which is convenient for inserting the inner core of the steel sheet pile, increases the friction resistance of the pile side, and controls the sedimentation of the pile body by utilizing the soil layers of the upper part and the lower part of the pile body; meanwhile, the multi-dimensional limiting of the snowflake type steel sheet pile inner core is realized by adopting a slide rail device; the pile splicing device is arranged to facilitate the control of the length of the steel plate pile core.
Has the advantages that: compared with the prior art, the invention adds the steel sheet pile into the cement mixing pile, and has the following advantages:
(1) the invention has the advantages of both wet-spraying cement pile foundation and steel sheet pile, stereo structure, increased bearing capacity, great pile side resistance, horizontal resistance and bending resistance, low foundation cost and fast construction speed.
(2) Compared with a steel sheet pile, under the same design requirement condition, the steel sheet pile has the advantages that the rigidity and the stability of the structure are improved, and the corrosion resistance, the durability and the fire resistance of the pile structure are enhanced.
(3) Compared with cement mixing piles, the snowflake steel sheet pile inner core is added, so that the bearing capacity of the composite pile is greatly improved, and the bending resistance is enhanced.
(4) In the foundation pit supporting engineering, when the depth of a foundation pit is large, the problems of long construction period and insufficient supporting capability are easily caused, and the surrounding environment is influenced. When the invention is adopted to support the foundation pit, the investment is saved, the influence on the surrounding environment is reduced, the water seepage resistance is good, and the supporting capability is multiple times of that of the conventional concrete supporting pile.
(5) The position arrangement of the guide assembly accords with the stress diffusion rule of soil mass around the pile, and is beneficial to fully stressing the pile body and enabling the pile body to achieve smaller settlement; meanwhile, the cement mixing pile and the outer core of the cement mixing pile make up for the condition that the side friction resistance is small due to the fact that the size of the high-strength steel sheet pile is relatively small, and the cement mixing pile has good shearing resistance, pulling resistance and bending resistance.
(6) When the pile body bears larger pulling force, the steel plate improves the shearing resistance of the pile body; in addition, compared with the steel sheet pile, the cement soil mixing pile or the rotary spraying pile is arranged around the existing pile foundation, and meanwhile, gypsum powder is added into cement, so that the impermeability of the cement mixing pile is improved, the snowflake type steel sheet pile inner core is protected from corrosion, and the horizontal resistance of the existing pile foundation is increased.
(7) When the method is adopted, if the reinforcement depth is large, namely the outer core of the cement mixing pile exceeds the set length, the segmental pile splicing treatment is carried out on the snowflake type steel sheet pile, so that the construction difficulty is reduced, the verticality error is avoided, and the strength and the stability of the inner core of the snowflake type steel sheet pile are improved.
(8) The addition of the outer core of the cement mixing pile and the stiffening ribs on the upper part of the snowflake type steel sheet pile makes up for the conditions of insufficient side friction resistance and insufficient structural stability caused by relatively small volume of the high-strength steel sheet pile, so that the cement mixing pile has good shear resistance, pulling resistance and bending resistance.
(9) The invention has wider application range, is used for projects with higher requirements on uneven settlement, and solves the problems of differential settlement of bridge heads, foundation pit support and soft foundation reinforcement.
(10) Because the invention has larger bearing capacity, and the core length can be adjusted according to the soil layer condition, the invention has wide application range and balances the problem of unreasonable construction cost caused by soil layer difference; has remarkable social benefit and economic and technical benefit, and has wide application prospect in the fields of buildings, roads, bridges and rock-soil.
Drawings
FIG. 1 is a schematic view of a composite driving type snowflake type pile system structure and construction thereof;
FIG. 2 is a schematic view of a guide assembly according to the present invention;
FIG. 3 is a schematic structural view of a slide rail device of the guide assembly of the present invention;
FIG. 4 is a top view of the process of inserting the steel sheet pile core according to the present invention;
FIG. 5 is a schematic diagram illustrating the adjustment of the core length of the snowflake-type steel sheet pile inner core according to the present invention;
FIG. 6 is a schematic diagram of core pile splicing of a snowflake type steel sheet pile according to the present invention;
fig. 7 is a top view of a pile splicing apparatus according to the invention;
FIG. 8 is a schematic view of the construction of the composite driving type snowflake type pile system of the present invention.
Detailed Description
As shown in fig. 1, the composite driving type snowflake type pile system of the invention comprises a cement mixing pile outer core 1, a snowflake type steel sheet pile inner core 2, a guide assembly, a pile extension device and a cement paste state monitoring system.
The snowflake type pile body is formed by compounding an outer core 1 of a cement mixing pile and an inner core 2 of a snowflake type steel sheet pile, namely the snowflake type steel sheet pile inner core is contained in the composite driving snowflake type pile body to be used as a support. The snowflake type steel sheet pile inner core comprises a pile body, a stiffening rib positioned on the pile body, a pile cap 3 positioned at the top of the inner core, an inner core support 4 and a pile tip 5 positioned at the pile bottom of the steel sheet pile.
The cross section of the pile body of the steel sheet pile inner core 2 is snowflake-shaped, Y-shaped and the included angle is 120 degrees. The length of the outer core 1 of the cement mixing pile and the length of the inner core 2 of the snowflake type steel sheet pile of each composite driving snowflake type pile system are selected according to design requirements. In the embodiment, the length of the outer core 1 of the cement mixing pile is less than or equal to 15m, and when the length of the outer core 1 exceeds 8m, the snowflake type steel plate pile inner core 2 is connected in a segmented pile connecting mode.
As shown in fig. 1 to 3, the snowflake type steel sheet pile core 2 of the present invention is provided with a guide assembly and a pile extension means at the time of pile driving for the convenience of installation and construction. Wherein, the guide assembly comprises a fixed support 10, a support rod 11 and a positioning unit; the support bar 11 moves within the fixed support 10.
The positioning unit comprises an I-shaped steel transverse rib 12, a first limiting plate 18, a second limiting plate 17, a shock-absorbing rubber pad 19 and a slide rail device 13; the I-shaped steel transverse rib 12, the first limiting plate 18 and the second limiting plate 17 fix the snowflake type steel sheet pile inner core 2 through the slide rail device 13.
As shown in fig. 3, a capacitor, a power supply and a pressure valve are built in the slide rail device 13, and the slide rail device 13 includes a first aluminum guide rail 15, a central aluminum rail 14 and a second aluminum guide rail 16; wherein, the first aluminum guide rail 15 and the second aluminum guide rail 16 are both L-shaped, and the central aluminum rail 14 is located between the first aluminum guide rail 15 and the second aluminum guide rail.
The slide rail devices 13 are symmetrically arranged at the end parts of the transverse I-steel ribs 12 and used for positioning the first limiting plate 18 and the second limiting plate 17. The transverse h-shaped steel ribs 12 are embedded into the guide rail grooves of the second aluminum guide rails 16 of the two symmetrically-installed slide rail devices 13 to be positioned after moving, that is, the two slide rail devices 13 are connected and fixed through the transverse h-shaped steel ribs 12. The first limit plate 18 moves in the rail groove of the first aluminum rail 15 of one of the rail devices 13; the second stopper plate 17 moves in a rail groove between the central aluminum rail 14 and the first aluminum rail 15 of the other symmetrical slide rail device 13.
As shown in fig. 4, when the steel sheet pile inner core is connected, firstly, the power supply of the slide rail system is started, the transverse i-steel ribs 12, the first limiting plate 18 and the second limiting plate 17 are expanded to the maximum distance, and then the two transverse i-steel ribs 12 are longitudinally moved through the slide rail device to clamp the longitudinal two sides of the snowflake type steel sheet pile inner core; remove first limiting plate 18 and second limiting plate 17 through slide rail device 13, first limiting plate 18 and the horizontal shrink of second limiting plate 17, consider the particularity of steel sheet pile inner core snowflake type, set first limiting plate 18, second limiting plate 17 and the contained angle of I-steel cross rib to 60 slants to the centre gripping restriction waits to squeeze into snowflake type steel-pipe pile inner core 2, thereby plays limiting displacement.
In the construction process of the present invention, as shown in fig. 7, the pile extension device includes a reinforcing plate 6, a pile extension ring 20, and a tightening nut 21; wherein, pile connecting ring 20 is provided with pile groove 22 for fixing the snowflake type steel sheet pile inner core.
The cement paste state monitoring system consists of a concrete water content detector 7, an air humidity sensor 8 and a computer 9 and is used for monitoring the state of cement paste in real time.
In addition, the steel sheet pile inner core pile cap 3 and the steel sheet pile inner core pile body 2 are installed separately, after the inner core pile body 2 is driven stably, the inner core pile cap 3 and the inner core pile body 2 are connected through a flange, and the pile cap 3 is provided with a steel sheet bearing platform 23.
As shown in FIG. 5, the length ratio of the snowflake type steel sheet pile inner core and the cement mixing pile outer core is adjusted according to soil layer conditions, and the snowflake type steel sheet pile inner core is divided into three working condition examples of long core, short core and equal core. In the invention, the pile body penetrates through the soft soil layer until the hard soil layer is reached to serve as the control standard of the pile length, so that the construction type is determined by the site soil layer investigation condition. When the soil layer of the shallow construction site is good and a qualified bearing stratum can be found, constructing the inner core of the snowflake type steel sheet pile in a short core or equal core mode; when the shallow soil layer of the construction ground is poor, a bearing layer needs to be searched in the deep soil layer, and then the long-core composite driven pile is adopted for construction.
As shown in FIG. 6, the snowflake type steel sheet pile inner core 2 adopts a sectional pile splicing mode when the cement mixing pile outer core 1 exceeds the snowflake type steel sheet pile inner core pile for a long time, the pile splicing device is adopted to fix the inner core pile body as shown in FIG. 7, and then the structural stability is improved by adopting a method of welding two sides of the periphery of the inner core pile body and additionally welding reinforcing plates.
As shown in fig. 8, the construction method of the composite driving type snowflake type pile system of the present invention comprises four steps, which are the manufacturing of the cement mixing pile outer core 1, the insertion of the snowflake type steel sheet pile inner core 2, the installation of the pile cap 3, the driving of the pile cap 3 and the coagulation of the pile. The concrete construction method of the composite driving type snowflake type pile system comprises the following steps:
(1) and (3) carrying out leveling treatment on the site of the pile to ensure no settlement, setting the pile position and the pile distance, marking at a fixed point, and clearing the barrier at the pile position.
(2) Moving a cement mixer to a specified pile making position, centering and adjusting to enable the device to be horizontal, enabling the positioning error between the drilling center point of the mixer and the center point of a pile body to be less than or equal to 2.5cm, detecting whether a main arm of a drilling machine is vertical through a theodolite or a total station on site, and adjusting a drill rod to enable the verticality deviation of the drill rod to be less than or equal to 1%;
(3) stirring the slurry, controlling the water cement ratio to be 0.45-0.5, and requiring the prepared cement slurry to have better fluidity and workability; meanwhile, gypsum powder is added into cement soil, so that the impermeability of the cement mixing pile is improved, and the snowflake type steel sheet pile inner core is protected from corrosion;
(4) and starting the cement mixer, drilling at the positioning point, sinking, and stirring to form a hole. The first drilling speed is controlled to be 0.5m/min, the forward circulation drilling is adopted, after the designed depth is reached, a high-pressure grouting pump is started, the reverse circulation drilling is started, the cement slurry is sprayed, at the moment, the slurry spraying speed is coordinated with the lifting speed, the distribution of the cement slurry along the pile length is ensured, and the stirring lifting speed is controlled to be 0.5-0.8 m/min. When the cement mixer is lifted to 0.8-1m below the ground, the cement mixer is slowly lifted and stirred, when the cement mixer is lifted to 0.2 m away from the ground, the cement mixer stops spraying the cement and is stirred for several seconds, so that the quality of the pile head is ensured.
(5) After preliminary mixing, utilizing concrete moisture content detector and air humidity transducer to carry out the thick liquid and detecting, the grout state meets the requirements and then carries out the repeated mixing, and promotes the stirring at last time and should adopt the promotion at a slow speed, when spouting mouthful arrival pile bolck elevation, stops promoting, stirs several seconds to guarantee the even closely knit of pile head, form the cement mixing pile outer core of not initial setting, guarantee that final pile forming position deviation is less than or equal to 5cm, pile shaft straightness deviation of hanging down is less than or equal to 1.5%.
(6) If stopping the slurry for any reason in the construction process, lifting the stirring head to a position 0.5m above the slurry stopping point, and stirring and lifting the stirring head after the slurry supply is resumed and the stirring and sinking position is less than one m below the slurry stopping position so as to avoid pile breakage.
(7) And (4) when the cement mixing pile is not initially set, namely within 30min after the mixing in the step (6) is stopped, preparing for inserting the snowflake type steel sheet pile inner core. When the inner core is placed, the leveling is carried out by adopting a skid and a steel buttress so as to reduce the deformation of the inner core of the snowflake type steel sheet pile.
(8) Fix snowflake type steel sheet pile guide assembly at the stake point, hoist snowflake type steel sheet pile simultaneously, ensure that the steel sheet pile inner core is under vertical state, inclination ≦ 1%, make the inner core arrange guide assembly in, adopt the positioning unit to inject steel sheet pile position and angle, aim at cement mixing pile center with steel sheet pile inner core stake point through guide assembly, lean on the dead weight to sink into the cement mixing pile perpendicularly in, should not be too fast at the beginning, after the stake point is squeezed into outer core, further correct the straightness that hangs down of steel sheet pile. The verticality deviation between the crane and the guide assembly and the ground is less than 1%. The insertion of the inner core of the snowflake type steel sheet pile is controlled within 30min after the stirring is stopped, and the longest time is not more than 1 hour. When the snowflake type steel sheet pile inner core is difficult to sink to the designed elevation by the dead weight, a hammering press tool is adopted to assist in sinking.
(9) If the outer core of the steel sheet pile does not need to be connected in a segmented manner, pile sinking of the inner core of the snowflake type steel sheet pile is controlled to reach the designed depth and reserve the length, and the outer core of the steel sheet pile enters the bearing layer by 0.8-1 m. In order to facilitate the arrangement of the pile cap, the insertion and remaining length of the inner core of the steel sheet pile is not less than 0.5 m. The pile cap and the pile body are connected into a whole through the flange, and the pile cap and the pile body are further driven into the inner core pile body.
(10) If steel sheet pile inner core segmentation pile extension, insert first section inner core to pile extension reserve length, clean the pile head this moment, clear away moisture, greasy dirt, mud, fix second section inner core through pile extension device, connect the pile through two-sided welding after linking up inerrably, stagger the joint. And after welding, polishing the welding line to be smooth by using a grinding wheel machine, removing welding slag, and checking whether the welding line is qualified. And welding the reinforcing plate after the inspection is qualified, keeping the reinforcing plate vertical during welding, and polishing the welding line again after the welding is finished. Then the inner core pile body is driven again; and repeating the operation until the inner core is inserted to the designed depth, and connecting the pile cap through the flange.
Claims (1)
1. A construction method of a composite driving type snowflake type pile system is characterized in that: the composite driving type snowflake type pile system comprises a cement mixing pile outer core (1), a snowflake type steel sheet pile inner core (2), a guide assembly, a pile splicing device and a cement paste state monitoring system;
the top of the snowflake type steel sheet pile inner core is provided with a pile cap (3), and the pile cap (3) is connected with a bearing platform;
when the outer core (1) of the cement mixing pile exceeds a set length, the inner core of the snowflake type steel sheet pile is driven into the outer core (1) of the cement mixing pile which is not initially set in a sectional pile connecting mode through a pile connecting device and a guide assembly;
the guide assembly comprises a fixed support (10), a support rod (11) and a positioning unit, wherein the support rod (11) moves in the fixed support (10);
the positioning unit comprises an I-shaped steel transverse rib (12), a first limiting plate (18), a second limiting plate (17) and a sliding rail device (13); the I-shaped steel transverse ribs (12), the first limiting plate (18) and the second limiting plate (17) are used for fixing the snowflake type steel sheet pile inner core (2) through the slide rail device (13);
the slide rail device (13) comprises a plurality of slide rail units symmetrically fixed on the transverse I-shaped steel rib (12), each slide rail unit comprises a first aluminum guide rail (15), a central aluminum rail (14) and a second aluminum guide rail (16), and the central aluminum rails (14) are connected through the first aluminum guide rails (15) and the second aluminum guide rails (16);
the pile splicing device comprises a pile splicing ring (20) and a tightening nut (21), wherein a pile groove (22) for fixing the snowflake type steel sheet pile inner core is formed in the pile splicing ring (20);
the cement paste state monitoring system comprises a concrete water content detector (7) and an air humidity sensor (8);
gypsum powder is added into the outer core of the cement mixing pile;
the construction method comprises the following steps:
(1) carrying out leveling treatment on the site of the pile, setting pile positions and pile distances and carrying out fixed-point marking;
(2) moving a cement mixer to a specified pile manufacturing position, centering and adjusting, wherein the positioning error between the drilling center point of the mixer and the center point of a pile body is less than or equal to 2.5cm, detecting whether a main arm of a drilling machine is vertical, and adjusting a drill rod to enable the verticality deviation of the drill rod to be less than or equal to 1%;
(3) mixing the slurry, and adding gypsum powder for anticorrosion protection of the snowflake type steel sheet pile inner core into the cement;
(4) starting a cement mixer, drilling at a positioning point and sinking, and forming a hole by stirring; after the designed depth is reached, a high-pressure grouting pump is started, reverse circulation drilling is started, and cement slurry is sprayed; when the deep layer stirring machine is lifted to 0.8-1m below the ground, slowly lifting and stirring, when the deep layer stirring machine is lifted to 0.2-0.4m away from the ground, stopping spraying slurry, and stirring for several seconds;
(5) after preliminary stirring, detecting grout by using a concrete water content detector and an air humidity sensor, stopping lifting when a grout spraying opening reaches the elevation of the pile top, stirring for several seconds, and finally, ensuring that the pile position deviation of a formed pile is less than or equal to 5cm and the perpendicularity deviation of a pile body is less than or equal to 1.5%;
(6) if stopping slurry for any reason in the construction process, lifting the stirring head to a position 0.5m above the slurry stopping point, and stirring and lifting after the slurry supply is resumed and the stirring is sunk to a position below 1m of the slurry stopping position;
(7) when the cement mixing pile is not initially set, preparing to insert the snowflake type steel sheet pile inner core;
(8) fixing a fixed support (10) at a pile point, placing the snowflake type steel sheet pile inner core in a positioning unit, limiting the position and the angle of the snowflake type steel sheet pile by adopting a slide rail device (13), switching on a power supply, longitudinally moving two I-shaped steel transverse ribs (12) through the slide rail device (13), and clamping two sides of the snowflake type steel sheet pile inner core; the first limiting plate (18) and the second limiting plate (17) are moved through the slide rail device (13), and the included angles between the first limiting plate and the transverse rib of the I-shaped steel are set to be 60 degrees so as to clamp the snowflake type steel sheet pile inner core (2); the pile tip of the steel sheet pile inner core is aligned to the center of the cement mixing pile through the guide assembly, and the steel sheet pile inner core is vertically inserted into the cement mixing pile outer core (1) which is not initially set through the self weight of the snowflake type steel sheet pile inner core;
(9) if the piles are not connected in sections, controlling the inner core of the snowflake type steel sheet pile to be driven into the outer core (1) of the cement mixing pile to the designed depth, and enabling the inner core to enter the bearing layer by 0.8-1 m; the pile cap and the snowflake type steel sheet pile inner core are connected into a whole through the flange, and the snowflake type steel sheet pile inner core is further driven into the cement mixing pile outer core (1);
(10) if the pile is spliced in sections, driving a first section of inner core in the inner core assembly to the reserved length of the spliced pile, fixing a second section of inner core through a pile splicing ring, splicing the pile by welding two sides, and staggering joints; after the welding is finished, polishing the welding line, welding the reinforcing plate again, and polishing the welding line again; driving the inner core assembly again; and repeating the operation until the inner core assembly is driven into the designed depth, and connecting the pile cap through the flange.
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