CN211773592U - Construction device for improving uniformity of cement soil mixing pile - Google Patents

Abstract

The application discloses improve construction equipment of cement mixing pile homogeneity relates to the civil engineering construction. The construction device comprises: slurrying equipment, a mixing pile machine and a control host. The mixing pile machine comprises a power head, a drill rod, a mixing blade and an automatic switching device. The upper part and the bottom part of the drill rod are correspondingly provided with drill rod guniting ports, a cement slurry channel is arranged in the drill rod, and the cement slurry channel is communicated with the drill rod guniting ports. The automatic switching device is arranged at the guniting port of the drill rod at the upper part and is configured to realize automatic switching of guniting in the drilling and lifting processes. This application has realized the drilling down through automatic switching device and has lifted the process conversion whitewashing automatic for drilling down in the construction is effective stirring with lifting, thereby guarantees grout and the soil body intensive mixing, makes pile body intensity unanimous, has greatly improved the construction efficiency of cement mixing pile, has realized that the construction of single reciprocal stirring can satisfy the stirring homogeneity, has shortened construction cycle greatly and has practiced thrift the cost.

Description

Construction device for improving uniformity of cement soil mixing pile

Technical Field

The application relates to civil engineering construction, in particular to a construction device for improving the uniformity of a cement mixing pile, which is applied to occasions of foundation pit enclosure, seepage prevention and foundation reinforcement in civil and industrial infrastructure construction.

Background

The cement mixing pile is a foundation reinforcing method suitable for saturated soft clay. It uses cement as solidifying agent, and utilizes a stirring machine to forcedly stir the soft soil and solidifying agent in the deep position of foundation, and utilizes a series of physical and chemical reactions produced between solidifying agent and soft soil to make the soft soil be consolidated into the artificial improved foundation with integrity, water stability and a certain strength.

The existing mixing pile construction equipment is generally single sinking guniting or lifting guniting.

A large number of engineering practices show that in the pile forming process of the cement-soil mixing pile, the mass distribution of the pile body is uneven along the pile length direction, and the mass of the upper part of the pile body is usually higher than that of the lower part. Therefore, the pile-forming quality control of the cement-soil mixing pile is always a hot point of concern in the engineering field. The defects of the existing cement-soil mixing pile construction method seriously affect the construction quality control of the existing cement-soil mixing pile construction method, and further affect the construction progress.

SUMMERY OF THE UTILITY MODEL

The inventor finds that the reason that the upper mass of the pile body is higher than the lower mass is that: is caused by the existing construction equipment and process of the mixing pile. The existing mixing pile construction equipment is generally single sinking guniting or lifting guniting, if repeated stirring is not carried out, the curing agent and soft soil are not fully stirred in the depth direction. The deep soil body confining pressure is great, and the grout is very easy to cause to get into the soil body less for the stirring homogeneity and the pile body intensity of the deep soil body can't be guaranteed. The inventors have found that this condition is improved if the guniting pattern is changed during the piling process. Based on this, this application provides a construction equipment of improvement cement mixing pile homogeneity.

According to an aspect of the present application, there is provided a construction apparatus for improving uniformity of a soil cement mixing pile, including:

a slurrying device for preparing a cement slurry, having a slurry delivery pipe;

stirring stake machine for provide stirring power, it includes:

the power head is used for providing power so as to drive the drill rod to rotate;

the drilling rod is connected with the power head and driven by the power head, the drilling rod is hollow, a plurality of stirring blades are fixed on the outer surface of the drilling rod to form a stirring blade section, drilling rod slurry spraying ports are correspondingly formed in the positions, at the upper part and the bottom part, of the stirring blade section in the drilling rod, at least one cement slurry channel is arranged in the hollow part of the drilling rod, and the cement slurry channel is communicated with the drilling rod slurry spraying ports;

the automatic switching device is arranged at a drill rod guniting port at the upper part of the drill rod and is configured to close the drill rod guniting port at the upper part to realize guniting of the drill rod guniting port at the bottom when the drill rod is drilled downwards; and

and the control host is connected with the pulping equipment and the power head of the mixing pile machine and is configured to control the pulp output amount of the pulping equipment and control the operation of the power head.

Optionally, the automatic switching device includes:

the base is arc-shaped and is fixed at a drill rod guniting port at the upper part of the drill rod, holes penetrating through two side parts are formed in the base along the axis of the base to form a sliding space, and a window penetrating through the holes is formed at the front end of the base and used for exposing a part of sliding blocks;

the sliding block is arranged in the hole and can slide in the sliding space so as to open or close a drill rod guniting port at the upper part of the drill rod; and

and the shifting block is fixed at the front end of the sliding block and extends outwards from the window.

Optionally, a beaded blade guniting port is arranged at the stirring blade at the bottommost part of the drill rod, and the beaded blade guniting port is communicated with the cement grout channel so as to realize the uniform distribution of the cement grout in the radial direction of the pile body.

Optionally, the beaded blade nozzle is configured as a plurality of linearly distributed blade nozzles of different diameters, and the diameter of the blade nozzle is larger the further away from the central axis of the drill pipe.

Optionally, the control host is configured to automatically control the grouting amount, and is further configured to automatically match the drilling speed of the drill rod, the rotating speed of the blades, the drilling depth and the grouting amount of each point section in real time, so as to ensure that cement grout is uniformly distributed along the length of the pile.

This application improves construction equipment of cement soil mixing pile homogeneity sets up automatic switching control equipment through drilling rod grout spraying mouth position on drilling rod upper portion, has realized that the drilling is down with lift the process conversion grout spraying automatic for the drilling in the construction is effective stirring with lifting, thereby guarantees grout and soil body intensive mixing. Therefore, the problem of pile body strength difference caused by uneven stirring of slurry and soil in the cement-soil mixing pile construction process is solved, the construction efficiency of the cement mixing pile is greatly improved, the mixing uniformity can be met by single reciprocating mixing construction, the construction period is greatly shortened, and the cost is saved.

The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic structural view of a construction apparatus for improving uniformity of a soil cement mixing pile according to an embodiment of the present application;

FIG. 2 is a schematic block diagram of a drill pipe shotcrete port and an automatic switching device in an upper portion of the drill pipe shown in FIG. 1;

FIG. 3 is a schematic block diagram at the bottom of the drill pipe of section A shown in FIG. 2;

FIG. 4 is a schematic perspective view of the drill rod shown in FIG. 1;

FIG. 5 is a sectional view taken along line B-B of FIG. 4;

figure 6 is a front cross-sectional view of the drill rod of figure 4.

The symbols in the drawings represent the following meanings:

100 a construction apparatus for a concrete structure, comprising,

10 a pulping device, 11 a pulp conveying pipe,

the control unit 20 controls the main unit,

30 a mixing pile machine is arranged in the mixing pile machine,

31 power head, 32 drilling rods, 33 stirring blades, 34 drilling rod guniting ports, 35 cement grout channel, 36 automatic switching device, 361 base, 362 hole, 363 window, 364 slide block, 365 shifting block, 37 blade guniting ports, 371 first blade guniting ports and 372 second blade guniting ports.

Detailed Description

Fig. 1 is a schematic structural view of a construction apparatus for improving uniformity of a soil cement mixing pile according to an embodiment of the present application. Fig. 2 is a schematic configuration view of a drill pipe spouting port and an automatic switching device in an upper portion of the drill pipe shown in fig. 1. Fig. 3 is a schematic block diagram at the bottom of the drill pipe of section a shown in fig. 2. Figure 4 is a schematic perspective view of the drill rod shown in figure 1. Fig. 5 is a sectional view taken along B-B in fig. 4. Figure 6 is a front cross-sectional view of the drill rod of figure 4.

As shown in fig. 1, and also referring to fig. 2 to 6, the present embodiment provides a construction apparatus 100 for improving uniformity of a soil cement mixing pile, which may generally include: the system comprises a pulping device 10, a mixing pile machine 30 and a control host machine 20. The pulping apparatus 10 is used for preparing cement paste, and the pulping apparatus 10 has a pulp feed pipe 11. The mixing pile machine 30 is used for providing mixing power. The mixing pile machine 30 includes: a power head 31, a drill stem 32, a stirring blade 33 and an automatic switching device 36. The power head 31 is used to provide power to rotate the drill stem 32. A drill stem 32 is connected to the power head 31 and is driven by the power head 31. The drill rod 32 is hollow inside, and a plurality of stirring blades 33 are fixed on the outer surface of the drill rod 32 and form a stirring blade segment. The drill rod 32 is provided with drill rod guniting ports 34 at the upper part and the bottom part of the stirring blade section correspondingly. More specifically, as shown in fig. 1, the upper drill pipe spouting port 34 is located at the drill pipe 32 corresponding to the uppermost stirring blade 33. As shown in fig. 3 and 5, the bottom drill pipe shotcrete port 34 is located at the bottom end of the drill pipe 32. As shown in fig. 2, 4 and 6, at least one cement slurry channel 35 is provided in the hollow portion of the drill rod 32, and the cement slurry channel 35 communicates with the drill rod spouting port 34. As shown in fig. 1, an automatic switching device 36 is provided at the drill pipe spouting port 34 of the upper portion of the drill pipe 32. The automatic switching device 36 is configured such that when drilling downwards, the automatic switching device 36 closes the upper drill rod shotcrete port 34 and realizes guniting of the lower drill rod shotcrete port 34. The automatic switching device 36 is configured such that when lifted upwards, the automatic switching device 36 opens the upper drill rod shotcrete port 34, and the upper drill rod shotcrete port 34 is realized. Thereby realizing the automatic conversion of the guniting in the drilling and lifting processes. The control host 20 is connected with the power head 31 of the pulping equipment 10 and the mixing pile machine 30, and is configured to control the pulp output amount of the pulping equipment 10 and control the operation of the power head 31.

This application improves construction equipment 100 of cement mixing pile homogeneity sets up automatic switching control equipment 36 through drilling rod grout spraying mouth 34 position on drilling rod 32 upper portion, has realized that the process conversion grout spraying is automatic with lifting drilling down for drilling down in the construction and lifting are effective stirring, thereby guarantee grout and soil body intensive mixing. Therefore, the problem of pile body strength difference caused by uneven stirring of slurry and soil in the construction process of the cement-soil mixing pile is solved. This application has realized that the construction of single reciprocal stirring can satisfy the stirring homogeneity, has greatly improved the construction efficiency of cement mixing stake from this, has shortened construction cycle greatly and has practiced thrift the cost.

In this embodiment, the mixing pile machine 30 is a single-shaft mixing pile machine. Of course, in other embodiments, the mixing pile machine 30 may also be a two-shaft mixing pile machine and a multi-shaft mixing pile machine.

More specifically, in this embodiment, the pulping apparatus 10 and the mixing pile machine 30 are both existing apparatuses in the prior art, and therefore detailed descriptions of the specific structures of the apparatuses in this embodiment are omitted. For example, the pulping apparatus 10 is of the type XB-1200. The mixing pile machine 30 is typically of type SBJ-II. In specific implementation, the control host 20 may be implemented by a control chip and a control circuit, and may also be implemented by a control circuit.

As shown in fig. 2, referring to fig. 1, 4, and 5, in this embodiment, the automatic switching device 36 includes: base 361, slider 364, and paddle 365. The base 361 is arc-shaped and is fixed at the drill pipe grout-spraying opening 34 at the upper part of the drill pipe 32. The base 361 has a hole 362 formed therein along its axis to penetrate both sides thereof, thereby forming a sliding space. The base 361 has a window 363 at a front end thereof through the hole 362 for exposing a portion of the slider 364. A slider 364 is mounted in the bore 362 and is slidable in the slide space to open or close the drill pipe tap 34 in the upper portion of the drill pipe 32. A toggle 365 is fixed at the front end of the slider 364 and extends outwardly from the window 363 to facilitate toggling of the slider 364.

In the implementation process of automatic switching of the shifting block 364 in this embodiment, the drill rod 32 drills downwards and anticlockwise, and the shifting block 364 is automatically closed under the pressure of soil; the drill rod 32 drills upwards and clockwise, and the shifting block 364 is automatically opened under the pressure of the soil.

In the process of implementing the present application, the inventors also found that the following problems still exist in the prior art: along the pile diameter direction, the pile body mass distribution is uneven, and the center mass of the pile body is generally higher than the edge mass. In other words, the prior art still has the problem of pile body strength difference caused by uneven slurry distribution.

The inventors have found that the reason for the above problems is: the existing mixing pile construction equipment usually sprays slurry at the central point of a drill rod 32, and cuts soil bodies by means of slurry spraying pressure and blades to generate gaps, so that cement slurry is distributed in the radial direction of a pile body, and the quality of cement soil is unevenly distributed in the radial direction.

In order to solve the above problem, in the present embodiment, as shown in fig. 1, referring to fig. 3 and 4, a beaded blade grout spraying port 37 is provided at the stirring blade 33 at the bottommost portion of the drill rod 32, and the beaded blade grout spraying port 37 is communicated with the cement grout channel 35, so as to achieve uniform distribution of cement grout in the radial direction of the pile body and further improve the pile forming quality. The beaded blade slurry spraying port 37 means that a plurality of blade slurry spraying ports 37 are linearly arranged at intervals. For example, the first blade spouting port 371 and the second blade spouting port 372 in the present embodiment are arranged at a linear interval like stringing beads on a string.

More specifically, in the present embodiment, as shown in fig. 1, and also referring to fig. 3 and 4, the beaded blade shotcrete ports 37 are configured as several linearly distributed blade shotcrete ports 37 having different diameters, and the diameter of the blade shotcrete ports 37 is larger as the distance from the central axis of the drill pipe 32 is farther. For example, in the present embodiment, the diameter of the second blade spouting port 372 is larger than the diameter of the first blade spouting port 371.

The inventor still discovers at the in-process of realizing this application that current cement mixing pile machine spouts thick liquid volume according to single flow control, because the change of soil layer softness and hardness, drilling rate differs, spouts thick liquid volume can't change with the stratum and matches, causes thick liquid volume along pile shaft degree of depth maldistribution.

In order to solve the above problem, in this embodiment, as shown in fig. 1, the control host 20 is configured to automatically control the grouting amount, and is further configured to automatically match the drilling speed, the blade rotation speed, the drilling depth and the grouting amount of each point section of the drill rod 32 in real time, so as to ensure that the cement grout is uniformly distributed along the length of the pile, and further improve the pile-forming quality.

Referring to fig. 1 to 6, the present embodiment further provides a construction method for improving the uniformity of a cement-soil mixing pile using the construction apparatus 100, which comprises the following steps:

setting out a real model according to the construction drawing;

grooving, namely grooving according to the requirements of a drawing;

moving the mixing pile machine 30 to a position to be constructed;

starting the pulping equipment 10, and preparing cement paste according to the water-cement ratio required by design;

the control host 20 is started, the construction parameters are input, and the control host 20 automatically controls the preset data, wherein the preset data comprise: drilling speed, spraying amount per meter, total slurry amount distribution and pile end design elevation;

starting a power head 31 of the mixing pile machine 30 to drive a drill bit, and spraying cement paste while mixing, wherein when sinking and drilling, a drill rod grout spraying port 34 at the bottom sprays cement paste or a blade grout spraying port 37 and the drill rod grout spraying port 34 at the bottom spray cement paste, the drill rod grout spraying port 34 at the upper part is closed, and the drilling reaches the designed pile bottom elevation;

reversely rotating the lifting power head 31, starting the automatic switching device 36, spraying cement slurry from the drill rod slurry spraying port 34 at the upper part, spraying cement slurry while stirring, lifting the drill to the elevation of the pile top, and forming a pile at one time;

and after one group is finished, moving to a second group for continuous construction until all the piles are formed.

According to the construction method for improving the uniformity of the cement-soil mixing pile, the automatic switching device 36 is arranged at the position of the drill rod guniting port 34 in the upper portion of the drill rod 32, so that the conversion of guniting in the drilling and lifting processes is automatic, the drilling and lifting in the construction process are both effective in mixing, and cement paste and soil are fully mixed. Therefore, the problem of pile body strength difference caused by uneven stirring of slurry and soil in the construction process of the cement-soil mixing pile is solved. The stirring uniformity can be met by single reciprocating stirring construction, so that the construction efficiency of the cement stirring pile is greatly improved, the construction period is greatly shortened, and the cost is saved.

The single pile aperture of stirring stake in this application can be 700 mm. Of course, in other embodiments, the aperture of the single pile of the mixing pile may also be 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 950mm, 1000mm or 1050mm, and other apertures, according to the construction requirement.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.

In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, "a plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (5)

1. A construction apparatus (100) for improving uniformity of a cement-soil mixing pile, comprising:

a slurrying device (10) for preparing a cement slurry, having a slurry feed pipe (11);

stirring stake machine (30) for provide stirring power, it includes:

the power head (31) is used for providing power to drive the drill rod (32) to rotate;

the drilling rod (32) is connected with the power head (31) and driven by the power head (31), the interior of the drilling rod (32) is hollow, a plurality of stirring blades (33) are fixed on the outer surface of the drilling rod (32) to form stirring blade sections, drilling rod guniting ports (34) are correspondingly arranged at the upper part and the bottom of the stirring blade sections in the drilling rod (32), at least one cement slurry channel (35) is arranged in the hollow part of the drilling rod (32), and the cement slurry channel (35) is communicated with the drilling rod guniting ports (34);

the automatic switching device (36) is arranged at a drill rod slurry spraying port (34) at the upper part of the drill rod (32), and is configured in such a way that when the drill rod is drilled downwards, the automatic switching device (36) closes the drill rod slurry spraying port (34) at the upper part to realize slurry spraying of the drill rod slurry spraying port (34) at the bottom part, and when the drill rod is lifted upwards, the automatic switching device (36) opens the drill rod slurry spraying port (34) at the upper part to realize the drill rod slurry spraying port (34) at the upper part, so that the automatic switching of slurry spraying during the drilling and the lifting processes is realized; and

and the control host (20) is connected with the pulping equipment (10) and the power head (31) of the mixing pile machine (30) and is configured to control the pulp output amount of the pulping equipment (10) and control the operation of the power head (31).

2. The construction device (100) according to claim 1, wherein the automatic switching device (36) comprises:

the base (361) is arc-shaped and is fixed at a drilling rod guniting port (34) at the upper part of the drilling rod (32), a hole (362) penetrating through two side parts is formed in the base (361) along the axis of the base to form a sliding space, and a window (363) penetrating through the hole (362) is formed at the front end of the base (361) and is used for exposing a part of the sliding block (364);

a slide block (364) which is installed in the hole (362) and can slide in the sliding space to open or close the drill rod guniting port (34) at the upper part of the drill rod (32); and

a dial (365) fixed at the front end of the slider (364) and projecting outwardly from the window (363).

3. The construction device (100) according to claim 1, wherein a beaded blade guniting port (37) is provided at the stirring blade (33) at the bottommost portion of the drill rod (32), and the beaded blade guniting port (37) is communicated with the cement grout passage (35) to achieve uniform distribution of cement grout in the radial direction of the pile body.

4. The construction device (100) according to claim 3, wherein the beaded blade nozzle (37) is configured as a plurality of linearly distributed blade nozzles (37) of different diameters, and the diameter of the blade nozzle (37) is larger the farther from the central axis of the drill pipe (32).

5. The construction apparatus (100) according to any one of claims 1-4, wherein said control host (20) is configured to automatically control the grouting amount and is further configured to automatically match the drilling rate, the blade rotation speed, the drilling depth and the amount of grout per section of the drill pipe (32) in real time to ensure that the grout is evenly distributed along the length of the pile.

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