CN113006036B - Construction method of prestressed bamboo joint pipe pile shallow curing composite foundation - Google Patents
Construction method of prestressed bamboo joint pipe pile shallow curing composite foundation Download PDFInfo
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- CN113006036B CN113006036B CN202110298712.6A CN202110298712A CN113006036B CN 113006036 B CN113006036 B CN 113006036B CN 202110298712 A CN202110298712 A CN 202110298712A CN 113006036 B CN113006036 B CN 113006036B
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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
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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
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Abstract
The application relates to a construction method of a prestressed bamboo joint pipe pile shallow curing composite foundation, which comprises the following steps: construction preparation, site cleaning, partition block division, curing agent blending, stirring construction through a stirring and spraying device, prepressing and prestress bamboo joint pipe pile construction. This application utilizes drive assembly low pipe rotation and sleeve rotation simultaneously through setting up rotatable low pipe and sleeve, has realized the revolution and the rotation of helical blade on the sleeve promptly, and two kinds of rotation modes superpose mutually to improve the stirring homogeneity to the normal position soil layer, in order to improve the mixed effect of curing agent and normal position soil greatly, and then improve normal position curing effect.
Description
Technical Field
The application relates to the field of foundation construction, in particular to a construction method of a prestressed bamboo joint pipe pile shallow curing composite foundation.
Background
With the development of engineering construction in China, more and more complex foundations of ultra-soft soil and special soil are encountered, such as: reclamation of land from the sea by hydraulic filling of soil foundations, ponds, fish ponds, swamp foundations, mud piling yards, polluted soil and the like can generate a large amount of engineering waste soil if the reclamation is carried out according to the traditional method.
Therefore, in order to solve the problems, the method for carrying out in-situ solidification treatment on the soft soil is a novel foundation treatment method, and the method is characterized in that a stirring device is used for stirring an in-situ soil layer, and a curing agent is sprayed into the in-situ soil layer, so that the curing agent is mixed with the in-situ soil layer, the in-situ soil layer is solidified, a hard shell layer is quickly formed, and an operation environment is provided for subsequent prestressed pipe pile construction.
In view of the above related technologies, the inventor believes that the existing stirring manner has a poor stirring effect on the in-situ soil layer, which easily causes a reduction in the mixing effect of the curing agent and the in-situ soil.
Disclosure of Invention
In order to improve the mixing effect of a curing agent and in-situ soil, the application provides a construction method of a prestressed bamboo joint pipe pile shallow curing composite foundation.
The application provides a construction method of a shallow solidification composite foundation of a prestressed bamboo joint pipe pile, which adopts the following technical scheme:
a construction method of a shallow curing composite foundation of a prestressed bamboo joint pipe pile comprises the following steps:
s1, construction preparation;
s2, cleaning a site;
s3, dividing the blocks: lofting an area to be processed and dividing the area into a plurality of processing blocks;
s4, blending a curing agent;
s5, stirring construction, namely stirring the in-situ soil in the treatment block by using stirring and spraying equipment, wherein the stirring and spraying equipment comprises a control device, a stirring device arranged at the control end of the control device and a spraying device used for spraying a curing agent into the in-situ soil layer; the stirring device comprises an upper pipe fixed at the control end of the control device, a lower pipe inserted in the upper pipe and a driving assembly for driving the lower pipe to rotate, wherein a plurality of support arms are convexly arranged on the peripheral side of the lower pipe, a sleeve driven to rotate by the driving assembly is rotatably sleeved on each support arm, a spiral cutting edge is arranged on the peripheral wall of the sleeve, and the spiral axis of the spiral cutting edge is coaxial with the rotation axis of the sleeve;
during stirring, the control end of the control device drives the lower pipe to be inserted into the in-situ soil layer, then the stirring device and the injection device are started simultaneously, the driving assembly controls the lower pipe and the sleeves to rotate, namely the sleeves revolve around the axis of the lower pipe to stir the in-situ soil, the helical blades on the sleeves rotate around the axis of the sleeves to stir the in-situ soil, and the injection device simultaneously injects the curing agent to mix the curing agent with the stirred in-situ soil;
s6, prepressing: laying iron plates in the processing block and prepressing the iron plates;
s7, construction of the prestressed bamboo joint pipe pile: and pressing the prestressed bamboo joint pipe pile into the in-situ soil layer.
Through adopting above-mentioned technical scheme, through setting up rotatable low tube and sleeve, utilize drive assembly low tube simultaneously to rotate and the sleeve rotates, even make the helical blade on the sleeve around the revolution of low tube axis and helical blade around the rotation of sleeve axis, these two kinds of rotation modes of the revolution of helical blade on the sleeve and rotation superpose mutually promptly, not only improve the stirring scope, stirring efficiency has been improved again, thereby improve the disturbance effect to the normal position soil, and improve the stirring homogeneity to the normal position soil layer, thereby improve the mixed effect of curing agent and normal position soil greatly, and then improve the normal position curing effect.
Optionally, each support arm is spirally arranged with the axis of the lower pipe as a center.
Through adopting above-mentioned technical scheme, first, the effect that creeps into can be improved in the forward revolution of the support arm of spiral arrangement, can upwards arrange soil promptly to bore down comparatively easily, secondly, the reverse revolution of the support arm of spiral arrangement can drive upper soil and move down, in order to improve stirring effect, improves the mixing homogeneity.
Optionally, the spiral blades on two adjacent sleeves have opposite rotation directions.
By adopting the technical scheme, the forward spiral cutting edge can drive the surrounding in-situ soil to move towards the axis direction of the lower pipe, and the reverse spiral cutting edge can drive the surrounding in-situ soil to move away from the axis direction of the lower pipe, namely, the forward spiral cutting edge and the reverse spiral cutting edge are mutually matched, and the surrounding in-situ soil can be driven to move in a reciprocating manner along the radial direction of the lower pipe, so that the stirring effect on the in-situ soil is greatly improved.
Optionally, the driving assembly comprises a driving motor fixed in the upper pipe, a rotating shaft fixed on an output shaft of the driving motor, and a plurality of first bevel gears fixed on the rotating shaft, the rotating shaft is coaxially arranged with the lower pipe, a rotating rod positioned in the support arm is coaxially fixed on the sleeve, the rotating rod is rotatably connected with the support arm, and the rotating rod is fixed with a second bevel gear meshed with the first bevel gear.
Through adopting above-mentioned technical scheme, driving motor drive pivot is rotated, and the pivot rotates in order to drive the bull stick through the meshing of first bevel gear and second bevel gear to the spiral blade on the drive sleeve rotates around the axis of bull stick, accomplishes spiral blade's rotation promptly.
Optionally, the driving assembly further includes a planetary gear member, the planetary gear member includes a sun gear fixed to the rotating shaft, a ring gear fixed to the inner wall of the lower pipe, and a planetary gear meshed with the sun gear and the ring gear at the same time, and each planetary gear is connected with the planet carrier.
By adopting the technical scheme, the driving motor drives the rotating shaft to rotate, and the rotating shaft drives the gear ring to rotate through the planet gear part, so that the lower pipe is driven to rotate around the lower pipe, namely the helical blade on the sleeve is driven to revolve.
Optionally, the drive assembly further comprises a clutch component arranged in the upper pipe, and the clutch component is used for braking the planet carrier.
By adopting the technical scheme, when the clutch component brakes the planet carrier, the planet carrier is locked, then the driving motor rotates in the positive direction to drive the rotating shaft to rotate, so that the lower pipe is driven to rotate through the planet gear component, the helical blades on the sleeves are driven to revolve around the axis of the lower pipe in the positive direction, and meanwhile, the rotating shaft drives the rotating rod to rotate through the meshing of the first bevel gear and the second bevel gear, so that the helical blades on the sleeves are driven to rotate around the axis of the rotating rod, namely, the medium revolution speed and the medium autorotation speed are adopted, and the first stirring mode is adopted; when the clutch component does not brake the planet carrier, the planet carrier is in the active state, namely the torque of the driving motor is input from the rotating shaft and output from the planet carrier and the gear ring, and the torque of the driving motor is preferably transmitted to the rotating rod, namely the torque of the rotating rod is larger, the torque transmitted to the gear ring is smaller, at the moment, the rotating speed of the lower pipe is lower, the rotating speed of the sleeve is higher, namely the rotating speed of the sleeve is low, and the rotating speed of the sleeve is high, namely the rotating speed of the sleeve is low, so that the stirring mode is the second stirring mode. First stirring mode is used for stirring on a large scale promptly, and the second stirring mode is used for stirring at a small scale and high speed, and its application scope is different, and through clutch parts's control to realize the switching of first stirring mode and second stirring mode, thereby realize different stirring effect, with satisfying different operating modes, thereby improve stirring suitability and effect greatly.
Optionally, the injection device comprises a slurry inlet pipe, a slurry outlet pipe and a background feeding assembly for feeding the slurry inlet pipe, a conveying passage is arranged at the axis of the rotating shaft, one end of the slurry inlet pipe is connected with an outlet of the background feeding assembly, and the other end of the slurry inlet pipe is connected with an upper port of the conveying passage through a first rotary joint; rotate in the pivot and overlap and be equipped with second rotary joint, second rotary joint's entry with the transfer passage intercommunication of pivot, go out the thick liquid pipe and wear to locate the axle center department of bull stick, go out the thick liquid pipe one end with second rotary joint's export intercommunication, the other end that goes out the thick liquid pipe is located the terminal surface of support arm, just go out the thick liquid pipe with second rotary joint rotates the setting around self axis.
By adopting the technical scheme, the curing agent in the background feeding assembly enters the conveying passage through the slurry inlet pipe, and then sequentially passes through the second rotary joint and the slurry outlet pipe and is sprayed into the in-situ soil layer, so that the mixing of the curing agent and the in-situ soil is realized; and the slurry outlet pipe can revolve along with the support arm, so that the spraying range of the curing agent is greatly improved.
Optionally, the export of play thick liquid pipe is equipped with the elasticity separation blade, the partial structure of elasticity separation blade shelters from the export of play thick liquid pipe, and the axis of play thick liquid pipe with the contained angle has between the medial surface of elasticity separation blade.
By adopting the technical scheme, the spraying route of the curing agent can be changed by shielding the elastic blocking piece, namely, an included angle is formed between the spraying route of the curing agent and the rotating rod, and the elastic blocking piece can rotate (rotate) along with the slurry outlet pipe, namely, the position of an unblocked outlet of the slurry outlet pipe is constantly changed, so that the spraying route of the curing agent is constantly changed, and the spraying range is greatly improved; and, the elasticity separation blade has elasticity, and when the export of stone card at elasticity separation blade and play thick liquid pipe, the injection pressure of curing agent will be exerted on the elasticity separation blade for the elasticity separation blade is little deformed, thereby makes the stone can drop, takes place with the condition that reduces the jam.
Optionally, the inner side surface of the elastic blocking sheet is convexly configured with a plurality of protrusions.
Through adopting above-mentioned technical scheme, when the stone card was between the export of elasticity separation blade medial surface and play thick liquid pipe, because bellied existence for there is certain clearance between stone and the elasticity separation blade, and this clearance can reduce the flow path sectional area of curing agent, thereby increases the velocity of flow and the pressure of curing agent, thereby changes and makes elasticity separation blade deformation, thereby gives the stone of blocking and washes away, takes place in order to reduce the condition of jam.
Optionally, when the clutch component brakes the planet carrier, the planet carrier is locked, and then the driving motor rotates in the forward direction to drive the rotating shaft to rotate, so that the lower pipe is driven to rotate through the planet gear component, so that the helical blades on the sleeves are driven to revolve around the axis of the lower pipe in the forward direction, and meanwhile, the rotating shaft drives the rotating rod to rotate through the meshing of the first bevel gear and the second bevel gear, so that the helical blades on the sleeves are driven to rotate around the axis of the rotating rod, that is, the stirring mode in which the two motion modes are overlapped is the first stirring mode; when the clutch component does not brake the planet carrier, the planet carrier is in a movable state, namely the torque of the driving motor is input from the rotating shaft and output from the planet carrier and the gear ring, at the moment, the rotating speed of the lower pipe is reduced, and the rotating speed of the sleeve is increased, namely the rotating speed is low in revolution speed and high in rotation speed, which is a second stirring mode;
in step S5, the concrete stirring step is as follows;
firstly, the stirring device operates in a first stirring mode, the driving motor rotates forwards, the injection device continuously injects the curing agent, the control device controls the stirring device to be inserted into the in-situ soil layer downwards, when the stirring device is positioned at the bottom of the in-situ soil layer, the depth of the in-situ soil layer is divided into multiple sections from bottom to top, namely when the stirring device is positioned at the section position, the stirring device is switched to a second stirring mode, the driving motor rotates backwards and continuously stirs for 10s-20s, after the section position is stirred, the stirring device is lifted to the next section position and is switched to the first stirring mode in the process, the driving motor rotates backwards, and the operation is repeated until the stirring device rises to be far away from the in-situ soil layer.
By adopting the technical scheme, the speed of the stirring device drilling into the in-situ soil layer can be accelerated in the first stirring mode of forward revolution, so that the stirring device can be quickly positioned to the bottom of the in-situ soil layer, and the first stirring mode can realize large-range stirring, so that the surrounding in-situ soil can be stirred in a large range in the drilling process of the stirring device, and the primary scattering and stirring effects are realized; the stirring device moves upwards to adopt a first stirring mode of reverse revolution, so that the disturbance effect on the in-situ soil can be increased, namely the in-situ soil above flows to below, namely the effect of up-down convection; when the stirring device is positioned in the section, the stirring device stays and adopts a second stirring mode of reverse revolution, so that the in-situ soil in the section can be stirred strongly and in a small range, and the in-situ soil in a small area can be stirred accurately and effectively; according to agitating unit's different vertical shift position promptly to match different stirring modes, thereby realize stirring on a large scale and the effective utilization of the powerful stirring of small scale, thereby improved the stirring effect to the normal position soil greatly.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by arranging the rotatable lower pipe and the sleeve, the lower pipe rotates and the sleeve rotates at the same time by utilizing the driving assembly, so that revolution and rotation of the helical blade on the sleeve are realized, and the two rotating modes are overlapped, so that the stirring uniformity of an in-situ soil layer is improved, the mixing effect of a curing agent and in-situ soil is greatly improved, and the in-situ curing effect is further improved;
2. by setting the opposite rotation directions of the adjacent spiral cutting edges and utilizing the mutual matching of the forward spiral cutting edges and the reverse spiral cutting edges, the in-situ soil around the lower pipe is driven to move in a reciprocating manner along the radial direction of the lower pipe, so that the stirring effect on the in-situ soil is greatly improved;
3. through the control of separation and reunion part to realize the switching of first stirring mode and second stirring mode, according to agitating unit's different vertical shift position, with the stirring mode of matching difference, thereby realize stirring on a large scale and the effective utilization of the powerful stirring of narrow range, thereby improved the stirring effect to the normal position soil greatly.
Drawings
Fig. 1 is a schematic view of the overall structure of the stirring and jetting apparatus of the present embodiment.
Fig. 2 is a partial sectional view of the stirring device of the present embodiment.
Fig. 3 is a partially enlarged view of a portion a in fig. 2.
Fig. 4 is a sectional view of the upper and lower tubes of the present embodiment.
Fig. 5 is a partially enlarged view at B in fig. 4.
Fig. 6 is a flow chart of the construction method of the present embodiment.
Description of reference numerals: 100. a control device; 200. a stirring device; 300. an injection device; 11. feeding a pipe; 12. a lower pipe; 121. a support arm; 122. a sleeve; 123. a helical cutting edge; 13. a drive assembly; 131. a drive motor; 132. a rotating shaft; 134. a sun gear; 135. a ring gear; 136. a planetary gear; 137. a planet carrier; 141. a cylinder; 142. a brake pad; 151. a first bevel gear; 152. a second bevel gear; 153. a rotating rod; 154. a conveying path; 21. a background feeding assembly; 22. a pulp inlet pipe; 221. a first rotary joint; 23. a pulp outlet pipe; 231. a second rotary joint; 232. an elastic baffle plate; 233. and (4) protruding.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses stirring and spraying equipment, which refers to fig. 1 and comprises a control device 100, a stirring device 200 arranged at the control end of the control device 100 and a spraying device 300 used for spraying a curing agent into an in-situ soil layer; wherein the control device 100 may be an excavator or a crane to drive the stirring device 200 to go down into the in-situ soil layer or to be separated from the in-situ soil layer.
As shown in fig. 1 and 2, the stirring device 200 includes an upper tube 11, a lower tube 12 and a driving assembly 13, wherein an upper end of the upper tube 11 is fixedly connected with the control device 100, an upper end of the lower tube 12 is inserted into a lower end of the upper tube 11, and the lower tube 12 is coaxially and rotatably connected with the upper tube 11.
A plurality of cylindrical support arms 121 are fixed on the lower periphery of the lower pipe 12 in a protruding manner, the support arms 121 are arranged obliquely downwards, and each support arm 121 is spirally arranged by taking the axis of the lower pipe 12 as the center; the sleeve 122 is rotatably sleeved on the support arm 121, the rotating axis of the sleeve 122 is the axis of the support arm 121, the spiral blade 123 is fixed on the outer circumferential surface of the sleeve 122, the spiral axis of the spiral blade 123 is coaxial with the rotating axis of the sleeve 122, and the rotating directions of the spiral blades 123 on two adjacent sleeves 122 are opposite.
The driving assembly 13 can drive the lower pipe 12 to rotate, namely, the helical blade 123 on the sleeve 122 rotates around the axis of the lower pipe 12, namely, the helical blade 123 revolves, and the driving assembly 13 can drive the sleeve 122 to rotate around the axis of the support arm 121, namely, the helical blade 123 rotates.
As shown in fig. 3, the driving assembly 13 includes a planetary gear member and a driving motor 131 fixed on the inner wall of the upper tube 11, wherein an output shaft of the driving motor 131 is fixed with a rotating shaft 132, the rotating shaft 132 is located in the lower tube 12, and the rotating shaft 132 is coaxially arranged with the lower tube 12; the planet gear members comprise a sun gear 134, a ring gear 135 and a plurality of planet gears 136, wherein the sun gear 134 is fixedly connected with the rotating shaft 132, the ring gear 135 is coaxially fixed with the inner wall of the lower tube 12, the planet gears 136 are simultaneously meshed with the sun gear 134 and the ring gear 135, and the planet gears 136 are commonly connected with an annular planet carrier 137.
The driving motor 131 drives the rotating shaft 132 to rotate, and the rotating shaft 132 drives the gear ring 135 to rotate through the planetary gear 136 component, so as to drive the lower pipe 12 to rotate around itself, i.e. drive the helical blade 123 on the sleeve 122 to revolve; and the revolution and the rotation are overlapped, so that the stirring range is increased, the stirring efficiency is improved, the stirring uniformity of the in-situ soil layer is improved, the mixing effect of the curing agent and the in-situ soil is greatly improved, and the in-situ curing effect is improved.
As shown in fig. 4 and 5, a plurality of first bevel gears 151 are fixed to the rotating shaft 132 at intervals along the axial direction thereof, and the first bevel gears 151 are arranged in one-to-one correspondence with the support arms 121; a rotating rod 153 is arranged at the axis of the support arm 121, the rotating rod 153 and the support arm 121 are coaxially and rotatably arranged, one end of the rotating rod 153 is fixedly connected with the sleeve 122, a second bevel gear 152 is fixed at the other end of the rotating rod 153, and the second bevel gear 152 is meshed with the first bevel gear 151; the driving motor 131 drives the rotating shaft 132 to rotate, and the rotating shaft 132 drives the rotating rod 153 to rotate through the engagement of the first bevel gear 151 and the second bevel gear 152, so as to drive the helical blade 123 on the sleeve 122 to rotate around the axis of the rotating rod 153, i.e. complete the rotation of the helical blade 123.
In order to control the revolution and rotation speeds of the screw blade 123 to be suitable for the mixing in different working conditions, as shown in fig. 3, a clutch member for braking the carrier 137 is provided on the inner wall of the upper pipe 11, the clutch member includes a cylinder 141 fixed in the upper pipe 11, and a brake pad 142 is fixed to a piston rod of the cylinder 141, that is, the contact of the brake pad 142 with the upper surface of the ring-shaped carrier 137 can be controlled by the expansion and contraction of the piston rod of the cylinder 141, thereby performing the braking by using the friction force.
When the clutch member brakes the planet carrier 137, that is, the planet carrier 137 is locked, then the driving motor 131 rotates forward to drive the rotation shaft 132 to rotate, so as to drive the lower pipe 12 to rotate through the planetary gear 136, so as to drive the helical blades 123 on the respective sleeves 122 to revolve around the axis of the lower pipe 12 in a forward direction, and at the same time, the rotation shaft 132 also drives the rotation rod 153 to rotate through the engagement of the first bevel gear 151 and the second bevel gear 152, so as to drive the helical blades 123 on the sleeves 122 to rotate around the axis of the rotation rod 153, that is, at a medium revolution speed and a medium rotation speed, which is a first stirring mode.
When the clutch member does not brake the carrier 137, the carrier 137 is in the active state, i.e., the torque of the driving motor 131 is input from the rotating shaft 132 and output from the carrier 137 and the ring gear 135, and the torque of the driving motor 131 is preferably transmitted to the rotating rod 153, i.e., the torque of the rotating rod 153 is large, and the torque transmitted to the ring gear 135 is small, at this time, the rotation speed of the lower pipe 12 is low, and the rotation speed of the sleeve 122 is high, i.e., the low revolution speed and the high rotation speed, which is the second stirring mode. First stirring mode is used for stirring on a large scale promptly, and the second stirring mode is used for stirring at a small scale and high speed, and its application scope is different, and through clutch parts's control to realize the switching of first stirring mode and second stirring mode, thereby realize different stirring effect, with satisfying different operating modes, thereby improve stirring suitability and effect greatly.
As shown in fig. 1 and 4, the injection device 300 includes a slurry inlet pipe 22, a slurry outlet pipe 23, and a rear feeding assembly 21 for feeding the slurry inlet pipe 22, wherein the rear feeding assembly 21 may be a high-pressure delivery tanker, which is located behind the control device 100; the shaft center of the rotating shaft 132 is provided with a conveying passage 154, the slurry inlet pipe 22 is made of flexible material, one end of the slurry inlet pipe 22 is connected with the outlet of the background feeding assembly 21, the other end of the slurry inlet pipe 22 penetrates through the upper pipe 11, and the other end is connected with the upper inlet of the conveying passage 154 through a first rotating joint 221.
As shown in fig. 5, a second rotary joint 231 corresponding to the arm 121 is rotatably sleeved on the rotating shaft 132, and an inlet of the second rotary joint 231 is communicated with the conveying passage 154; the pulp outlet pipe 23 is fixedly arranged at the axis of the rotating rod 153 in a penetrating manner, one end of the pulp outlet pipe 23 is exposed out of the end surface of the support arm 121 far away from the lower pipe 12, the other end of the pulp outlet pipe 23 is communicated with an outlet of the second rotating joint 231, and the pulp outlet pipe 23 and the second rotating joint 231 are rotatably connected around the axis of the pulp outlet pipe 23; the fluid delivery principle of the swivel joint is that the inner wall of the swivel joint has an annular groove that communicates with the holes formed in the shaft 132, so that the liquid in the delivery passage 154 of the swivel joint can flow out from the holes to the annular groove to the output pipe during the rotation of the shaft 132.
The curing agent in the background feeding assembly 21 enters the conveying passage 154 through the slurry inlet pipe 22, and then sequentially passes through the second rotary joint 231 and the slurry outlet pipe 23 and is sprayed into the in-situ soil layer, so that the mixing of the curing agent and the in-situ soil is realized.
As shown in fig. 5, an outlet of the slurry outlet pipe 23 is provided with an elastic blocking piece 232, the elastic blocking piece 232 is made of rubber, and a plurality of protrusions 233 are protruded from the inner side surface of the elastic blocking piece 232; part of the structure of the elastic baffle 232 shields the outlet of the pulp outlet pipe 23, and an included angle is formed between the axis of the pulp outlet pipe 23 and the inner side surface of the elastic baffle 232.
The embodiment of the application also discloses a construction method for curing the composite foundation by the shallow layer of the prestressed bamboo joint pipe pile by applying the stirring and spraying equipment, which comprises the following steps:
s1, construction preparation, which comprises the following steps:
s1.1, according to the main characteristics of engineering, the distribution of peripheral material sources, traffic conditions and site environments are investigated, and the construction of temporary construction facilities such as stock yards, equipment sites and the like is carried out.
S1.2, performing a manufacturability test before construction, wherein the manufacturability test comprises the strength of a field solidified soil body, a construction technology test and the like; and performing field trial stirring by adopting the optimal mixing ratio determined by an indoor mixing ratio test, evaluating the actual reinforcing effect under the optimal mixing ratio by using field test results such as a cross plate strength test or static sounding, and optimizing and adjusting the mixing ratio by combining the actual results.
S2, site cleaning: the method is characterized in that impurities such as surface impurities and the like which affect sinking and stirring are removed from a treatment area, a field is leveled, and field trial stirring is performed before construction.
S3, dividing the blocks: and lofting and dividing the area to be processed into a plurality of processing blocks.
S4, preparing a curing agent.
S5, stirring construction: dividing the depth of the in-situ soil layer into a plurality of section positions from bottom to top, firstly, operating the stirring device 200 in a first stirring mode, positively rotating the driving motor 131, continuously spraying the curing agent by the spraying device 300, controlling the stirring device 200 to be downwards inserted into the in-situ soil layer by the control device 100, and accelerating the speed of the stirring device 200 entering the in-situ soil layer by the first stirring mode of positive revolution, thereby realizing that the stirring device 200 is fast positioned to the bottom of the in-situ soil layer, and realizing large-range stirring by the first stirring mode, so that the stirring device 200 can stir the surrounding in-situ soil in a large range in the downward drilling process, thereby realizing the effect of primarily scattering and stirring the in-situ soil.
When the stirring device 200 is located at the bottom of the in-situ soil layer, that is, when the stirring device 200 is located at the first section, the second stirring mode is switched, the driving motor 131 rotates reversely, and the stirring is continued for 10s to 20s, so that the in-situ soil in the section can be stirred strongly and within a small range, and the in-situ soil in the section can be stirred accurately and effectively.
After the first-stage stirring is finished, the stirring device 200 is switched to a first stirring mode, the driving motor 131 rotates reversely, then the stirring device 200 is lifted upwards to the next-stage process, and the first stirring mode of reverse revolution is adopted, so that the disturbance effect on the in-situ soil can be increased, namely the in-situ soil above flows to the below, namely the effect of up-and-down convection is achieved; the above operation is then repeated until the stirring device 200 is lifted away from the in situ soil layer.
S6, prepressing and maintaining, including the following steps:
s6.1, prepressing: after the processing blocks are stirred, iron plates are paved on the processing blocks to serve as an excavator construction supporting platform of the next processing block, and the iron plates are paved every other half day or one day and then are pre-pressed by an excavator.
S6.2, maintenance: after the whole field area is cured, after the strength of shallow soil is preliminarily improved, an excavator is used for moving in the field to level and roll the field, and after the whole construction is finished, a plastic film is paved for curing and then curing.
S7, construction of the prestressed bamboo joint pipe pile: and (3) pressing the pile by adopting a full hydraulic static pile press, and slowly pressing the pile according to the point position after centering and adjusting to ensure that the prestressed bamboo joint pipe pile is vertically pressed into the soil layer.
In the press mounting process, an operator in a main control chamber of the pile machine observes the pressure gauge at any time, controls pile pressing force, adjusts the pressure of the pile machine to be synchronously balanced, avoids eccentricity, and evenly divides length marks on a pile body according to 1m intervals before the pile is buried so as to control the buried depth of the pile body. Recording the pressure value once per 1m of pressure, and controlling the pile pressing speed to be 1.0-1.9 m/min.
S8, constructing gravel among piles, geogrid and sand cushion, comprising the following steps:
s8.1, filling broken stones among piles: and paving broken stones among the piles in a layered mode, and rolling and compacting in a layered mode, wherein the compaction degree meets the design requirement, and the filling height of the broken stones is required to be 5-10cm higher than that of the pile caps.
S8.2, laying geogrids: after the gravel construction between piles is finished and the acceptance is qualified, the geogrid is laid according to the design requirement, and the laying needs to be smooth and free of wrinkles. After the laying is finished, the soil is pressed and fixed by the inserted nails and the earth and the stone.
S8.3, sand cushion layer construction: the geogrid is laid, and a sand cushion is laid after self-checking and supervision inspection approval. The sand cushion layer must be laid in time, so that the exposure time of the geogrid is not more than 48 h.
The implementation principle of the embodiment of the application is as follows: through setting up rotatable low tube 12 and sleeve 122, utilize drive assembly 13 low tube 12 simultaneously to rotate and sleeve 122 rotates, realized the revolution and the rotation of helical blade 123 on the sleeve 122 promptly, two kinds of rotation modes superpose mutually to improve the stirring homogeneity to the normal position soil layer, with the mixed effect that improves curing agent and normal position soil greatly, and then improve normal position curing effect.
And, through the switching of clutch parts to stirring mode to different stirring modes of different vertical shift position matching according to agitating unit, thereby realize stirring on a large scale and the effective utilization of the strong stirring of narrow range, thereby improved the stirring effect to the normal position soil greatly.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A construction method of a prestressed bamboo joint pipe pile shallow solidification composite foundation is characterized by comprising the following steps: the method comprises the following steps:
s1, construction preparation;
s2, cleaning a site;
s3, dividing the blocks: lofting an area to be processed and dividing the area into a plurality of processing blocks;
s4, blending a curing agent;
s5, stirring construction, namely stirring the in-situ soil in the treatment block by using stirring and spraying equipment, wherein the stirring and spraying equipment comprises a control device (100), a stirring device (200) arranged at the control end of the control device (100) and a spraying device (300) used for spraying a curing agent into the in-situ soil layer; the stirring device (200) comprises an upper pipe (11) fixed at the control end of the control device (100), a lower pipe (12) inserted in the upper pipe (11), and a driving assembly (13) used for driving the lower pipe (12) to rotate, wherein a plurality of support arms (121) are convexly arranged on the peripheral side of the lower pipe (12), a sleeve (122) driven to rotate by the driving assembly (13) is rotatably sleeved on each support arm (121), a spiral cutting edge (123) is arranged on the peripheral wall of the sleeve (122), and the spiral axis of each spiral cutting edge (123) is coaxial with the rotation axis of the sleeve (122);
during stirring, the control end of the control device (100) drives the lower pipe (12) to be inserted into the in-situ soil layer, then the stirring device (200) and the injection device (300) are started simultaneously, the driving assembly (13) controls the lower pipe (12) and the sleeves (122) to rotate, namely, the sleeves (122) revolve around the axis of the lower pipe (12) to stir the in-situ soil, the helical blades (123) on the sleeves (122) rotate around the axis of the sleeves to stir the in-situ soil, and simultaneously the injection device (300) injects the curing agent to mix the curing agent with the stirred in-situ soil;
s6, prepressing: laying iron plates in the processing block and prepressing the iron plates;
s7, construction of the prestressed bamboo joint pipe pile: pressing the prestressed bamboo joint pipe pile into an in-situ soil layer;
the driving assembly (13) comprises a driving motor (131) fixed in the upper pipe (11), a rotating shaft (132) fixed on an output shaft of the driving motor (131), and a plurality of first bevel gears (151) fixed on the rotating shaft (132), the rotating shaft (132) and the lower pipe (12) are coaxially arranged, a rotating rod (153) positioned in the support arm (121) is coaxially fixed on the sleeve (122), the rotating rod (153) is rotatably connected with the support arm (121), and a second bevel gear (152) meshed with the first bevel gear (151) is fixed on the rotating rod (153);
the driving assembly (13) further comprises a clutch component arranged in the upper pipe (11), and the clutch component is used for braking the planet carrier (137); the clutch component comprises an air cylinder (141) fixed in the upper pipe (11), and a brake pad (142) is fixed on a piston rod of the air cylinder (141).
2. The construction method of the prestressed bamboo joint pipe pile shallow curing composite foundation according to claim 1, characterized in that: the support arms (121) are spirally arranged by taking the axis of the lower pipe (12) as a center.
3. The construction method of the prestressed bamboo joint pipe pile shallow curing composite foundation according to claim 2, characterized in that: the spiral blade (123) on two adjacent sleeves (122) are opposite in rotation direction.
4. The construction method of the prestressed bamboo joint pipe pile shallow curing composite foundation according to claim 1, characterized in that: the driving assembly (13) comprises a driving motor (131) fixed in the upper pipe (11), a rotating shaft (132) fixed on an output shaft of the driving motor (131), and a plurality of first bevel gears (151) fixed on the rotating shaft (132), the rotating shaft (132) and the lower pipe (12) are coaxially arranged, a rotating rod (153) located in the support arm (121) is coaxially fixed on the sleeve (122), the rotating rod (153) is rotationally connected with the support arm (121), and a second bevel gear (152) meshed with the first bevel gears (151) is fixed on the rotating rod (153).
5. The construction method of the prestressed bamboo joint pipe pile shallow curing composite foundation according to claim 1, characterized in that: the spraying device (300) comprises a pulp inlet pipe (22), a pulp outlet pipe (23) and a background feeding assembly (21) for feeding the pulp inlet pipe (22), a conveying channel (154) is arranged at the axis of the rotating shaft (132), one end of the pulp inlet pipe (22) is connected with an outlet of the background feeding assembly (21), and the other end of the pulp inlet pipe (22) is connected with an upper port of the conveying channel (154) through a first rotary joint (221); rotate the cover on pivot (132) and be equipped with second rotary joint (231), the entry of second rotary joint (231) with transfer passage (154) intercommunication of pivot (132), go out thick liquid pipe (23) and wear to locate the axle center department of bull stick (153), the one end of play thick liquid pipe (23) with the export intercommunication of second rotary joint (231), the other end that goes out thick liquid pipe (23) is located the terminal surface of support arm (121), just go out thick liquid pipe (23) with second rotary joint (231) rotate around self axis and set up.
6. The construction method of the prestressed bamboo joint pipe pile shallow curing composite foundation according to claim 5, characterized in that: the export of play thick liquid pipe (23) is equipped with elasticity separation blade (232), the partial structure of elasticity separation blade (232) shelters from the export of play thick liquid pipe (23), and the axis of play thick liquid pipe (23) with the contained angle has between the medial surface of elasticity separation blade (232).
7. The construction method of the prestressed bamboo joint pipe pile shallow curing composite foundation according to claim 6, characterized in that: the inner side surface of the elastic baffle sheet (232) is convexly provided with a plurality of bulges (233).
8. The construction method of the prestressed bamboo joint pipe pile shallow curing composite foundation according to claim 1, characterized in that: when the clutch component brakes the planet carrier (137), the planet carrier (137) is locked, then the driving motor (131) rotates in the forward direction to drive the rotating shaft (132) to rotate, so that the lower pipe (12) is driven to rotate through the planet gear component, so that the helical blades (123) on the sleeves (122) are driven to revolve around the axis of the lower pipe (12) in the forward direction, meanwhile, the rotating shaft (132) drives the rotating rod (153) to rotate through the meshing of the first bevel gear (151) and the second bevel gear (152), so that the helical blades (123) on the sleeves (122) are driven to rotate around the axis of the rotating rod (153), namely, the stirring mode with the two motion modes overlapped is a first stirring mode; when the clutch part does not brake the planet carrier (137), the planet carrier (137) is in a movable state, namely the torque of the driving motor (131) is input from the rotating shaft (132) and output from the planet carrier (137) and the ring gear (135), the rotating speed of the lower pipe (12) is reduced, the rotating speed of the sleeve (122) is increased, namely the low revolution speed and the high rotation speed, and the second stirring mode is formed;
in step S5, the concrete stirring step is as follows;
firstly, the stirring device (200) runs in a first stirring mode, the driving motor (131) rotates forwards, the spraying device (300) continuously sprays the curing agent, the control device (100) controls the stirring device (200) to be downwards inserted into the in-situ soil layer, when the stirring device (200) is located at the bottom of the in-situ soil layer, the depth of the in-situ soil layer is divided into multiple sections from bottom to top, namely when the stirring device (200) is located at the section position, the stirring device is switched to a second stirring mode, the driving motor (131) rotates backwards and continuously stirs for 10s-20s, after the section position stirring is finished, the stirring device (200) is lifted to the next section position, the first stirring mode is switched to, the driving motor (131) rotates backwards, and the operation is repeated until the stirring device (200) rises to be far away from the in-situ soil layer.
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| JP2842771B2 (en) * | 1993-10-13 | 1999-01-06 | 株式会社テノックス | Knotted soil cement column construction equipment |
| CN101245596B (en) * | 2008-03-18 | 2010-06-30 | 徐玉杰 | Multi-azimuth tridimensional stirring drill for mollisol or spongy soil reinforcing stirring pile |
| KR101052548B1 (en) * | 2009-10-08 | 2011-07-29 | 주식회사 성원중기계 | Stirring rod for ground excavation |
| KR101284089B1 (en) * | 2012-05-15 | 2013-07-19 | 주식회사 네지트 | Enhanced ground improvement of mixing device and method of ground improvement |
| CN104863113B (en) * | 2015-06-04 | 2017-08-22 | 杭州特诚基础工程科技有限公司 | The method and mixing plant of original place curing process are carried out to in-situ soil |
| CN205348160U (en) * | 2016-01-28 | 2016-06-29 | 郑州巨业液压机械有限公司 | Novel cement flour spouts two -way stirring stake machine construction equipment |
| CN107813424A (en) * | 2017-09-05 | 2018-03-20 | 吉林省田舍建筑材料研发制造有限公司 | A kind of new vertical shaft type planetary mixer of band balance vibrator |
| CN209907378U (en) * | 2019-03-26 | 2020-01-07 | 东莞嘉誉诚建设基础工程有限公司 | Cement mixing pile machine |
| CN210367368U (en) * | 2019-05-31 | 2020-04-21 | 三川德青科技有限公司 | Rotary sludge in-situ solidification device |
| CN110397028A (en) * | 2019-07-08 | 2019-11-01 | 罗红云 | Reverse agitating function transmission mechanism and device, two-way stirring drill bit, mixing pile machine and its application method |
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