CN110894723A - Cement mixing pile construction equipment with upper and lower grout spraying openings and construction method - Google Patents
Cement mixing pile construction equipment with upper and lower grout spraying openings and construction method Download PDFInfo
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- CN110894723A CN110894723A CN201911010420.7A CN201911010420A CN110894723A CN 110894723 A CN110894723 A CN 110894723A CN 201911010420 A CN201911010420 A CN 201911010420A CN 110894723 A CN110894723 A CN 110894723A
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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Abstract
The invention provides cement-soil mixing pile construction equipment with an upper grout spraying port and a lower grout spraying port, which comprises a rotatable stirring shaft, wherein the lower part of the stirring shaft is provided with a plurality of stirring blades, a lower grout spraying pipe is arranged inside the stirring shaft, the lower end of the stirring shaft is provided with the lower grout spraying port connected with the lower grout spraying pipe, the outer side of the stirring shaft is provided with the upper grout spraying pipe, the lower end of the upper grout spraying pipe is provided with the upper grout spraying port, the grout spraying direction of the upper grout spraying port is transverse, the upper grout spraying port is positioned above the stirring blades, and the upper grout spraying port is provided with a one-; the end part of the upper guniting pipe is fixedly connected with the stirring shaft through a hoop, and the upper guniting pipe is fixed and does not rotate relative to the hoop. The equipment can change the working time of the high-low grout-spraying opening, so that the cement soil is fully stirred after grout spraying. The method has the characteristics of high construction efficiency, uniform stirring of the formed cement soil, high strength, good water stopping effect and the like.
Description
Technical Field
The invention relates to the technical field of civil engineering, further relates to the technical field of traffic municipal roadbed and foundation engineering, and particularly relates to the technical field of reinforcement treatment of weak soil bodies.
Background
Along with the rapid development of urbanization construction, the technical requirements on the construction of foundation foundations related to traffic, municipal and underground space construction are higher and higher, and the cement-soil mixing pile technology is used as a green technology for reinforcing a soft foundation and forming a waterproof curtain, so that the rapid popularization and application are achieved. Therefore, higher requirements are put forward on the construction quality and the construction efficiency of the concrete. However, the construction quality and the construction efficiency of the existing single-shaft and multi-shaft cement-soil mixing piles can not meet the development requirement of the current foundation engineering, and a large number of engineering accidents occur while the engineering quality and the construction period are influenced, so that huge economic loss is caused.
The construction process of the existing single-shaft and multi-shaft mixing pile machine mainly has the following problems:
1) in the existing mixing pile machine, a guniting port is positioned at the bottom position of a drill bit (namely the lower part of a mixing blade) or at the upper part of the mixing blade, when guniting is carried out in the drilling process, a rock-soil body is not stirred to be loosened, a sprayed slurry has small diffusion gap, and the diffusion radius is small; when the drill is lifted and the grout is sprayed, the diffusion resistance of the grout along the drill rod is smaller than the diffusion resistance towards the periphery, a large amount of grout return occurs, and the loss of external grout is large;
2) in order to meet the requirement of full diffusion of slurry, the existing cement-soil stirring method increases the amount of slurry spraying by increasing the water-cement ratio, so that the water content of cement-soil is increased, and the strength is reduced;
3) the grout spraying openings of the existing mixing pile machine are not uniformly distributed, so that grout can not be uniformly diffused in a mixing pile body, the grout is very unevenly mixed with a rock-soil body, and the strength distribution of the mixing pile body is also seriously uneven; the non-uniformity of the strength distribution is further aggravated by the sleeve-driving connection between each two adjacent three-axis mixing piles.
4) In the existing two-axis or three-axis cement soil mixer, the slurry spraying and the stirring cannot be carried out simultaneously, so that the sprayed slurry cannot be stirred in time, a large amount of slurry return phenomenon occurs, and a large amount of reinforcing materials are wasted;
5) the single-shaft and double-shaft mixing piles have small mixing pile machine power, low soil layer penetrating capacity and shallow mixing and reinforcing depth, and cannot meet the requirements of deep soft soil reinforcement;
6) the stirring blades of the existing stirring pile machine are only distributed in the range of one meter above the drill bit, the rotating speed is low, the contact probability of the stirring blades and the soil body is low, the solidified cement slurry and the soil body cannot be fully stirred and cut, no slurry exists in a large complete soil block, and the uniformity and the compactness of a formed stirring wall are poor. The waterproof curtain has great influence on the quality of the waterproof curtain and is not suitable for the waterproof curtain formed in the sandy soil body. For the double-shaft mixing pile with the guniting port positioned at the upper part of the mixing blade, a skylight is formed at the bottom of the mixing pile, and the double-shaft mixing pile is not suitable for water stop or foundation reinforcement.
7) And the pile forming efficiency is low. The pile forming efficiency is lower no matter in a single shaft, a double shaft or a three shaft way. The effective width of each pile of the single-shaft stirring pile machine is only 400-700 mm, and the effective width of each pile of the double-shaft stirring pile is only 1.0m (so as to)
A double-shaft stirring pile is taken as an example);
the effective width of each pile of the triaxial mixing pile is only 1.2 m. And because the width of the pile is limited, the equipment is frequently moved, and the working efficiency is greatly reduced.
8) And the mechanization level is low. Most of the existing single-shaft or double-shaft mixing pile equipment are in a pipe type, the equipment is slow in movement and easy to overturn, and the labor amount of machine moving is large; the verticality of the pile machine, the drilling and lifting speed of a drill rod are low, the torque is small, the cutting capability of a drill bit is small, the manual control speed is completely depended on, the error is large, and the pile forming quality is influenced;
9) the control of key indexes such as water-cement ratio, admixture doping amount, slurry flow and the like mainly depends on manpower, large errors exist, and pile forming quality is influenced;
10) the lapping quality between piles of each single-shaft stirring pile and the double-shaft stirring pile is difficult to guarantee, and the foundation pit leakage is easy to cause. The existing single-shaft cement-soil mixing pile construction equipment is shown in figure 1, and can be seen from the figure that one pile is constructed at a time, a continuous pile wall is formed by overlapping piles, the designed overlapping quantity becomes negative due to the fact that the diameter of a drill rod is small, the rigidity of the drill rod is small, deformation is easy to occur, and in addition, the positioning error and the verticality error are added, and the opening of the mixing pile in the lower portion along the axial direction or the direction perpendicular to the axial direction is represented. The single-shaft stirring pile forms the continuous wall, and the probability of opening seams is higher due to more lap seams.
The above-mentioned problems, which are summarized mainly by limitations in both construction equipment and construction process, have seriously hindered the application and development of the mixing pile technology. Therefore, research and development and innovation of cement soil reinforcement construction equipment and a construction method are necessary.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides cement-soil mixing pile construction equipment with an upper grout spraying opening and a lower grout spraying opening and a construction method adopting the equipment.
In order to solve the above problems, the technical solution of the present invention is as follows:
cement mixing pile construction equipment with upper and lower grout spraying mouth, including rotatable (mixing) shaft, the (mixing) shaft lower part is provided with a plurality of stirring vane, and the inside grout spraying pipe that is provided with down of (mixing) shaft, the lower extreme of (mixing) shaft be provided with lower grout spraying mouth, characterized by of grout spraying union coupling down: an upper guniting pipe is arranged outside the stirring shaft, and an upper guniting port is arranged at the lower end of the upper guniting pipe; the end part of the upper guniting pipe is fixedly connected with the stirring shaft through a hoop, and the upper guniting pipe is fixed and does not rotate relative to the hoop.
And the lower guniting pipe in the stirring shaft and the upper guniting pipe outside the stirring shaft are connected with an external slurry supply pipeline through a guniting conversion valve.
The lower guniting pipe inside the stirring shaft and the upper guniting pipe outside the stirring shaft are respectively connected with the slurry pumps for slurry supply, and the switch of each slurry pump is controlled so as to control whether the guniting of the upper guniting port and the lower guniting port is in guniting or not.
The guniting direction of the upper guniting port is horizontal, vertical or oblique, and the upper guniting port is provided with a one-way valve.
The upper slurry spraying port is positioned above the stirring blade.
The upper slurry spraying port is positioned below the stirring blade.
The guniting direction of the lower guniting port is horizontal, vertical or oblique and rotates along with the stirring shaft; the lower guniting port is provided with a one-way valve.
The one-way valve is a baffle or a baffle plate which can only open outwards
The stirring shaft is two, the upper guniting pipes are two, and the two upper guniting pipes are respectively and closely arranged at one side of the stirring shaft.
The stirring shafts are two, the upper guniting pipe is one, and one upper guniting pipe is arranged in the middle of the two stirring shafts.
The stirring shafts are three, the three stirring shafts are arranged in a shape like a Chinese character 'pin', the upper guniting pipes are three, the three upper guniting pipes are respectively clung to the same side of the stirring shaft or between two adjacent stirring shafts, and the guniting direction of the upper guniting port transversely faces to the direction of the adjacent stirring shaft.
The stirring shaft is three, and three (mixing) shafts become the row, goes up the whitewashing pipe and is three, and three go up the whitewashing pipe and hug closely respectively and arrange in the same one side of (mixing) shaft or between two adjacent (mixing) shafts, go up the whitewashing mouth whitewashing direction and be the direction of keeping away from the (mixing) shaft for horizontal orientation.
The stirring shafts are three, the three stirring shafts are arranged in a straight line, the upper guniting pipes are two, the two upper guniting pipes are respectively arranged on one side of each of the two stirring shafts or between the two adjacent stirring shafts in a clinging manner, and the guniting direction of the upper guniting ports is the direction which transversely faces away from the stirring shafts.
The four stirring shafts are arranged in a square shape, the four upper guniting pipes are respectively arranged on the same side of the stirring shaft or between two adjacent stirring shafts in a close fit manner, and the guniting direction of the upper guniting port transversely faces to the direction of the adjacent stirring shaft.
The four stirring shafts are arranged in a straight line, the four upper guniting pipes are respectively arranged on the same side of the stirring shaft or between two adjacent stirring shafts in a clinging manner, and the guniting direction of the upper guniting port is a direction which transversely faces away from the stirring shaft.
The stirring shafts are four, the four stirring shafts are arranged in a straight line, the number of the upper guniting pipes is three, the three upper guniting pipes are respectively and tightly attached to one side of the three stirring shafts or the middle of two adjacent stirring shafts, and the guniting direction of the upper guniting port is the direction which transversely faces away from the stirring shafts.
The stirring shaft is five, five stirring shafts are arranged into two rows, one row is provided with two stirring shafts, one row is provided with three stirring shafts, the upper guniting pipe is five, the five upper guniting pipes are respectively clung to the same side of the stirring shaft or the middle of two adjacent stirring shafts, and the guniting direction of the upper guniting port is the direction which transversely faces away from the stirring shaft.
The stirring shafts are five, the five stirring shafts are arranged in a straight line, the number of the upper guniting pipes is four, the four upper guniting pipes are respectively and tightly attached to one side of the four stirring shafts or the middle of two adjacent stirring shafts, and the guniting direction of the upper guniting port is the direction which transversely faces away from the stirring shafts.
The stirring shafts are n, the number of the upper guniting pipes is less than n, and n is an integer greater than 1.
The construction method for constructing the cement-soil mixing pile by adopting the cement-soil mixing pile construction equipment with the upper and lower grout-spraying openings comprises the following steps:
A) down drill
The stirring shaft drills downwards from the elevation of the pile top to the elevation of the pile bottom, and the lower guniting port is guniting or not guniting in the process;
B) reciprocating by a certain height h
The stirring shaft is lifted up by h from the elevation of the pile bottom, and the slurry is sprayed or is not sprayed at the upper slurry spraying port in the process; then the stirring shaft drills to the bottom of the pile from the height h, and the lower guniting port is guniting or not guniting in the process;
h is larger than the vertical distance between the upper and lower grout spraying ports;
C) lifting of
The stirring shaft is lifted upwards to the elevation of the pile top from the elevation of the pile bottom, and the slurry is sprayed through the slurry spraying port in the process.
B) In the step, according to the actual situation, repeat.
When the end part of the stirring shaft is positioned at the bottom of the pile or after the end part of the stirring shaft is lifted to h height, the stirring shaft stops lifting to carry out fixed spraying, and a guniting port carries out guniting under the fixed spraying process.
When the pile top elevation is below the ground, the part between the pile top elevation and the ground is not sprayed with the cement.
Compared with the prior art, the soft soil foundation reinforced by the equipment has the advantages of uniform strength, uniform density, higher bearing capacity, better water stopping effect, low construction cost, controlled dust pollution in the construction process, no environmental pollution and environmental protection.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a schematic view of a stirring shaft as described in example 1.
Fig. 1a is a schematic diagram of the operation of a guniting conversion valve.
FIG. 2 is a schematic view of the two stirring shafts of example 2.
FIG. 2a is a schematic cross-sectional view of the stirring shaft at the hoop in example 2.
FIG. 2b is the schematic view of the upper guniting pipe located in the middle of two stirring shafts.
FIG. 3 is a schematic view of three stirring shafts as described in example 3.
FIG. 3a is a schematic cross-sectional view of the stirring shaft at the hoop of example 3.
FIG. 3b is another schematic view of the section of the stirring shaft at the hoop of the embodiment 3 a.
FIG. 3c is a schematic view of three stirring shafts arranged in a line and two upper guniting pipes positioned in the middle of the stirring shafts.
FIG. 3d is a schematic view of three stirring shafts arranged in a delta shape and three upper guniting pipes positioned in the middle of the stirring shaft.
FIG. 4 is a schematic representation of four stirring shafts as described in example 4.
FIG. 4a is a schematic cross-sectional view of the stirring shaft at the hoop of example 4.
FIG. 4b is a schematic representation of four stirring shafts as described in example 4 a.
FIG. 4c is a schematic cross-sectional view of the stirring shaft at the hoop of example 4 a.
FIG. 5 is a schematic diagram of a construction screen curve during the construction process according to the construction method of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Referring to fig. 1a, the lower guniting pipe 3 inside the stirring shaft and the upper guniting pipe 5 outside the stirring shaft are connected with an external slurry supply pipeline through a guniting conversion valve 8. The lower guniting pipe 3 and the upper guniting pipe 5 downstream of the guniting conversion valve 8 are respectively provided with an air path conversion valve 9 for switching air injection.
The direction and orientation of the upper grout spraying opening 6 can be set as required, such as left, right or downward grout spraying.
The lower guniting port 4 can also be adjusted and arranged into lateral guniting or downward guniting according to requirements.
In the embodiment 2, referring to 2 and 2a, the stirring shaft is two, two upper guniting pipes 5 are respectively and closely arranged on one side of the stirring shaft 1, and the guniting direction of an upper guniting port is transverse and faces to the left side or the right side. Of course, the two upper guniting pipes 5 can also be arranged at the inner side or the outer side of the stirring shaft. Otherwise, the procedure is similar to example 1.
Referring to fig. 2b, there are two stirring shafts, and one upper guniting pipe 5 is located between two adjacent stirring shafts.
Otherwise, the procedure is similar to example 1.
In the embodiment 3, referring to fig. 3 and fig. 3a, three stirring shafts are arranged in a line, three upper slurry spraying pipes 5 are respectively and closely arranged on the same side of the stirring shaft 1, and the slurry spraying direction of the upper slurry spraying port is a direction which transversely faces away from the stirring shaft.
Otherwise, the procedure is similar to example 1.
In the embodiment 3a, referring to fig. 3b, the number of the stirring shafts is three, three stirring shafts 1 are arranged in a finished product shape, three upper guniting pipes 5 are respectively and closely arranged on the same side of the stirring shafts, and the guniting direction of the upper guniting ports is the direction transversely facing to the adjacent stirring shafts.
Otherwise, the procedure is similar to example 1.
Referring to fig. 3c, three stirring shafts 1 are arranged in a line, and two upper slurry-spraying pipes 5 are located between two adjacent stirring shafts, similar to example 1.
Referring to fig. 3d, three stirring shafts 1 are arranged in a shape like a Chinese character 'cheng', and three upper slurry spraying pipes 5 are arranged between two adjacent stirring shafts, and the rest is similar to that of embodiment 1.
In example 4, referring to fig. 4 and 4a, four stirring shafts are provided, four stirring shafts 1 are arranged in a line, four upper slurry spraying pipes 5 are respectively arranged on the same side of the stirring shafts in a close contact manner, and the slurry spraying direction of the upper slurry spraying port is a direction which transversely faces away from the stirring shafts.
Otherwise, the procedure is similar to example 1.
In the embodiment 4a, referring to fig. 4b and 4c, four stirring shafts are arranged in a square shape, four upper guniting pipes are respectively arranged on the same side of the stirring shaft in a close fit manner, and the guniting direction of the upper guniting port is towards the direction of the adjacent stirring shaft in a transverse direction.
Otherwise, the procedure is similar to example 1.
Four stirring shafts are arranged in a straight line, and three upper guniting pipes are respectively positioned between two adjacent stirring shafts. Otherwise, the procedure is similar to example 1.
Four stirring shafts are arranged in a square shape, and the four upper guniting pipes are respectively positioned between every two adjacent stirring shafts. Otherwise, the procedure is similar to example 1.
Of course, the stirring shaft can also be a plurality of n stirring shafts, the n stirring shafts 1 are arranged in a straight line, the n upper guniting pipes 5 are respectively arranged on the same side of the stirring shaft or in the middle of two adjacent stirring shafts in a clinging manner, and the guniting direction of the upper guniting port is a direction which transversely faces away from the stirring shaft.
The construction method for constructing the cement-soil mixing pile by adopting the equipment comprises the following steps:
A) down drill
The stirring shaft drills downwards from the elevation of the pile top to the elevation of the pile bottom, and the grout is sprayed through a lower grout spraying port in the process;
B) reciprocating by a certain height h
The stirring shaft is lifted up by h from the elevation of the pile bottom, and the slurry is sprayed or is not sprayed at the upper slurry spraying port in the process; then the stirring shaft drills to the bottom of the pile from the height h, and the lower guniting port guniting is carried out in the process;
h is the vertical distance between the upper and lower grout spraying ports;
C) lifting of
The stirring shaft is lifted upwards to the elevation of the pile top from the elevation of the pile bottom, and the slurry is sprayed through the slurry spraying port in the process.
B) In the step, according to the actual situation, repeat.
And after the stirring shaft is positioned at the bottom of the pile or the stirring shaft is lifted to h height, stopping lifting of the stirring shaft for fixed spraying, and spraying slurry at a slurry spraying port in the fixed spraying process.
When the pile top elevation is below the ground, the part between the pile top elevation and the ground is not sprayed with the cement.
Referring to fig. 5, in this example, the drill rod is drilled down according to a certain number of rotation times, and a small amount of water is sprayed to drill down when the drill rod is difficult to drill into a soil layer in the drilling process, and the water spraying amount needs to be controlled so as not to affect the quality of the pile body. If an obstacle is encountered in the process of drilling down, the actions of lifting and drilling down are repeated, so that the downward drilling is facilitated.
Hard soil layer is judged through the hard soil layer elevation of comparison current and design, need the water spray to bore down this moment, until getting into the certain degree of depth of hard soil layer. The rotation times can be adjusted during the drilling process so as to facilitate the drilling.
And intercepting a GPS coordinate after the pile is drilled to the bottom, lifting at the speed of 1m/s at the rotating speed of 22r/min and the lifting height of 4.5m after the pile position is determined to be accurate, and spraying no water and spraying no grout in the process. The rotating direction of the drill rod is opposite to that of the drill pipe during the lifting process.
After 4.5m of lifting (the value is related to the length of the drill rod and the number of the blade forms), the drill rod is switched to rotate, then the drill rod is lowered, the drilling is carried out according to the set rotating times, the slurry is sprayed, and the cutting times are calculated from the stage until the slurry is sprayed to the bottom of the pile, wherein the ① is shown in the figure.
Referring to the ② process in the figure, the reverse lifting drill is 1m after the drill is lowered to the bottom, the process is carried out according to the fixed rotation times, and water spraying and pulp squeezing actions exist in the process to prevent pipe blockage.
⑦ in the figure, in order to reverse and lift the pile, reverse and lift from the pile bottom, switch the upper and lower guniting ports before starting, ensure the opening of the upper guniting port, and lift the drill according to the set rotating speed, set lifting speed and designed guniting speed in the lifting process until the designed pile top is reached, and the pile is formed.
In order to fully mix cement paste and soil body and form a stirring pile body with reliable quality and uniform quality, the cutting times of the soil body are required to be controlled, and the cutting times of the soil body per linear meter of a reciprocating section are 2160 times; wherein the cutting times of the soil body per linear meter are calculated as follows:
t ═ Σ M (Nu/Vu + Nd/Vd) X + T0, where:
t is the cutting times of the soil body per linear meter;
sigma M is the number of the blades;
nu is the rotating speed of the blade during stirring and lifting, and the unit is rotation per minute;
vu is the stirring and lifting speed, and the unit is m/min;
nd is the rotating speed of the blade when stirring is reduced, and the unit is rotation per minute;
vd is the stirring descending speed, and the unit is m/min;
x is the reciprocating times;
t0 is constant flow or constant stirring times, T0 ∑ M × N × T,
sigma M is the number of the blades; n is the rotating speed of the blade during fixed spraying or fixed stirring; and T is fixed spraying or fixed stirring time.
When a pile is formed, a certain parameter is changed, and in order to ensure the cutting times of the soil body, the system can automatically balance other parameters.
In this embodiment, the number of cutting times for the last meter of pile bottom treatment is:
①(30/0.4)*1*4＝300
②(30/0.4)*1*4＝300
③(30/0.4)*1*4＝300
④(30/0.4)*1*4＝300
⑤(30/0.4)*1*4＝300
⑥(30/0.4)*1*4＝300
⑦30*4*3＝360
① + ② + ③ + ④ + ⑤ + ⑥ + ⑦ times 2160.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited by the foregoing examples, which are provided to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (30)
1. Cement mixing pile construction equipment with upper and lower grout spraying mouth, including rotatable (mixing) shaft, the (mixing) shaft lower part is provided with a plurality of stirring vane, and the inside grout spraying pipe that is provided with down of (mixing) shaft, the lower extreme of (mixing) shaft be provided with lower grout spraying mouth, characterized by of grout spraying union coupling down: an upper guniting pipe is arranged outside the stirring shaft, and an upper guniting port is arranged at the lower end of the upper guniting pipe; the end part of the upper guniting pipe is fixedly connected with the stirring shaft through a hoop, and the upper guniting pipe is fixed and does not rotate relative to the hoop.
2. The apparatus for constructing a soil cement mixing pile with upper and lower grout spraying ports as claimed in claim 1, wherein the lower grout spraying pipe inside the mixing shaft and the upper grout spraying pipe outside the mixing shaft are connected to an external grout supply pipeline through a grout spraying change-over valve.
3. The apparatus for constructing a soil cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the lower grout-spraying pipe inside the mixing shaft and the upper grout-spraying pipe outside the mixing shaft are connected to the grout pumps respectively for grout supply, and the opening and closing of each grout pump is controlled to control whether the upper and lower grout-spraying ports are grout-sprayed or not.
4. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the direction of grout-spraying of the upper grout-spraying port is horizontal, vertical or oblique, and the upper grout-spraying port is provided with a check valve.
5. The apparatus for constructing a soil-cement mixing pile having upper and lower grout-spouting ports according to claim 1, wherein the upper grout-spouting port is located above the mixing blade.
6. The apparatus for constructing a soil-cement mixing pile having upper and lower grout-spouting ports according to claim 1, wherein the upper grout-spouting port is located in the middle of the mixing blade.
7. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the grout-spraying direction of the lower grout-spraying port is horizontal, vertical or oblique and rotates with the mixing shaft; the lower guniting port is provided with a one-way valve.
8. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 4 or 7, wherein the check valve is a baffle or a baffle plate which is open only to the outside.
9. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-injection ports as claimed in claim 1, wherein the number of the agitating shafts is two, the number of the upper grout-injection pipes is two, and the two upper grout-injection pipes are respectively disposed to be closely attached to one side of the agitating shafts.
10. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-injection ports as claimed in claim 1, wherein the number of the agitating shafts is two, the number of the upper grout-injection pipes is one, and one upper grout-injection pipe is disposed at a middle position between the two agitating shafts.
11. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-injection ports as claimed in claim 1, wherein the number of the stirring shafts is three, the three stirring shafts are arranged in a delta shape, the number of the upper grout-injection pipes is three, the three upper grout-injection pipes are respectively closely arranged on the same side of the stirring shaft or between two adjacent stirring shafts, and the grout-injection direction of the upper grout-injection port is oriented in a direction transversely toward the adjacent stirring shaft.
12. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the number of the stirring shafts is three, the three stirring shafts are arranged in a line, the number of the upper grout-spraying pipes is three, the three upper grout-spraying pipes are respectively arranged closely on the same side of the stirring shafts or between two adjacent stirring shafts, and the grout-spraying direction of the upper grout-spraying port is a direction transversely facing away from the stirring shafts.
13. The apparatus for constructing a soil-cement mixing pile according to claim 1, wherein the number of the stirring shafts is three, the three stirring shafts are arranged in a line, the number of the upper slurry spraying pipes is two, the two upper slurry spraying pipes are respectively arranged on one side of the two stirring shafts or between the two adjacent stirring shafts, and the slurry spraying direction of the upper slurry spraying port is a direction which is transversely away from the stirring shafts.
14. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-injection ports as claimed in claim 1, wherein the number of the stirring shafts is four, the four stirring shafts are arranged in a square shape, the number of the upper grout-injection pipes is four, the four upper grout-injection pipes are respectively arranged closely on the same side of the stirring shaft or between two adjacent stirring shafts, and the grout-injection direction of the upper grout-injection port is oriented transversely toward the adjacent stirring shaft.
15. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the number of the stirring shafts is four, the four stirring shafts are arranged in a straight line, the number of the upper grout-spraying pipes is four, the four upper grout-spraying pipes are respectively arranged closely on the same side of the stirring shafts or between two adjacent stirring shafts, and the grout-spraying direction of the upper grout-spraying port is a direction transversely facing away from the stirring shafts.
16. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein four stirring shafts are arranged in a straight line, three upper grout-spraying pipes are provided, the three upper grout-spraying pipes are respectively closely arranged at one side of three stirring shafts or between two adjacent stirring shafts, and the direction of grout-spraying from the upper grout-spraying port is a direction transversely facing away from the stirring shafts.
17. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the number of the stirring shafts is five, the five stirring shafts are arranged in two rows, one row is formed by two, one row is formed by three, the number of the upper grout-spraying pipes is five, the five upper grout-spraying pipes are respectively arranged closely on the same side of the stirring shafts or between two adjacent stirring shafts, and the grout-spraying direction of the upper grout-spraying ports is a direction transversely facing away from the stirring shafts.
18. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the number of the mixing shafts is five, the five mixing shafts are arranged in a straight line, the number of the upper grout-spraying pipes is four, the four upper grout-spraying pipes are respectively arranged closely at one side of the four mixing shafts or between two adjacent mixing shafts, and the grout-spraying direction of the upper grout-spraying port is a direction transversely facing away from the mixing shafts.
19. The apparatus for constructing a soil-cement mixing pile with upper and lower grout-spraying ports as claimed in claim 1, wherein the number of the stirring shafts is n, the number of the upper grout-spraying pipes is less than n, and n is an integer greater than 1.
20. The construction method for constructing the cement-soil mixing pile by adopting the cement-soil mixing pile construction equipment with the upper and lower grout-spraying openings is characterized by comprising the following steps of:
A) down drill
The stirring shaft drills downwards from the elevation of the pile top to the elevation of the pile bottom;
B) reciprocating by a certain height h
The stirring shaft is lifted up by h from the elevation of the pile bottom, and then the stirring shaft is drilled down to the pile bottom from h, and the section is fully stirred;
the height h is greater than the vertical distance between the upper and lower grout spraying ports;
C) lifting of
The stirring shaft is lifted upwards to the elevation of the pile top from the elevation of the pile bottom.
21. The method as set forth in claim 20, wherein the B) is reciprocated by a height h at least once.
22. The method as set forth in claim 20, wherein the lower grout port is used for grout injection during the drilling of the A) step.
23. The method as claimed in claim 20, wherein B) the step of reciprocating the shaft by a height h is performed by lifting the shaft from the elevation of the pile bottom to the height h, the step of spraying the cement slurry from the upper port is performed by the shaft, and the step of drilling the shaft from the height h to the bottom of the pile is performed by the shaft, and the step of spraying the cement slurry from the lower port is performed by the shaft.
24. The method as set forth in claim 20, wherein the C) the lifting operation is performed by spraying the grout through the upper grout port.
25. The method as set forth in claim 20, wherein the lower grout port does not spray grout during the drilling of a) step.
26. The method as claimed in claim 20, wherein the step B) comprises the step of lifting the mixing shaft from the elevation of the pile bottom to the height h, wherein the upper grout port is not grouted, and the step B) comprises the step of drilling the mixing shaft from the height h to the bottom of the pile, wherein the lower grout port is not grouted.
27. The method as set forth in claim 20, wherein the top grout is not applied during the C) lifting process.
28. The method as claimed in claim 20, wherein the stirring shaft stops moving up and down to perform the fixed-position grouting after the end of the stirring shaft is located at the bottom of the pile or after the end of the stirring shaft is lifted to a height of h, and the grout is injected through the lower grout-injecting port during the fixed-position grouting.
29. The method as claimed in claim 20, wherein the cement-soil mixed pile is constructed by using the cement-soil mixed pile construction equipment having the upper and lower grout injection ports, wherein when the pile top elevation is located below the ground, the grout is not injected into a portion between the pile top elevation and the ground.
30. The method as claimed in claim 20, wherein the cement-soil mixing pile is constructed by using cement-soil mixing pile construction equipment having upper and lower grout-spraying openings, wherein the soil cutting times of the mixing pile per linear meter in the reciprocating section are at least 1800 times; and the cutting times of the soil body per linear meter T ═ Sigma M (Nu/Vu + Nd/Vd) X + T0, wherein:
t is the cutting times of the soil body per linear meter;
sigma M is the number of the blades;
nu is the rotating speed of the blade during stirring and lifting, and the unit is rotation per minute;
vu is the stirring and lifting speed, and the unit is m/min;
nd is the rotating speed of the blade when stirring is reduced, and the unit is rotation per minute;
vd is the stirring descending speed, and the unit is m/min;
x is the reciprocating times;
t0 is constant flow or constant stirring times, T0 ∑ M × N × T,
sigma M is the number of the blades; n is the rotating speed of the blade during fixed spraying or fixed stirring; and T is fixed spraying or fixed stirring time.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019105919640 | 2019-07-02 | ||
| CN201910591964.0A CN110374096A (en) | 2019-07-02 | 2019-07-02 | The cement-soil stirring pile construction equipment and construction method that can be whitewashed up and down |
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| Publication Number | Publication Date |
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| CN110894723A true CN110894723A (en) | 2020-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910591964.0A Pending CN110374096A (en) | 2019-07-02 | 2019-07-02 | The cement-soil stirring pile construction equipment and construction method that can be whitewashed up and down |
| CN201911010420.7A Pending CN110894723A (en) | 2019-07-02 | 2019-10-23 | Cement mixing pile construction equipment with upper and lower grout spraying openings and construction method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910591964.0A Pending CN110374096A (en) | 2019-07-02 | 2019-07-02 | The cement-soil stirring pile construction equipment and construction method that can be whitewashed up and down |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114000501A (en) * | 2021-12-13 | 2022-02-01 | 上海强劲地基工程股份有限公司 | Construction method of large-diameter land four-axis mixing pile |
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2019
- 2019-07-02 CN CN201910591964.0A patent/CN110374096A/en active Pending
- 2019-10-23 CN CN201911010420.7A patent/CN110894723A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114000501A (en) * | 2021-12-13 | 2022-02-01 | 上海强劲地基工程股份有限公司 | Construction method of large-diameter land four-axis mixing pile |
| CN114000501B (en) * | 2021-12-13 | 2023-01-17 | 上海强劲地基工程股份有限公司 | Construction method of large-diameter land four-axis mixing pile |
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| CN110374096A (en) | 2019-10-25 |
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