WO2020248702A1

WO2020248702A1 - Bidirectional overall stirring apparatus and method for reinforcing shallow soft foundation using same

Info

Publication number: WO2020248702A1
Application number: PCT/CN2020/084847
Authority: WO
Inventors: 杜广印; 刘松玉; 蔡光华; 宫能和; 储海岩; 高常辉; 秦川; 钱星辰
Original assignee: 东南大学
Priority date: 2019-06-11
Filing date: 2020-04-15
Publication date: 2020-12-17
Also published as: CN110359448B; CN110359448A

Abstract

Disclosed in the present invention is a bidirectional overall stirring apparatus. Said apparatus comprises a machine body, a frame, a feed device, a power transmission system, an outer drill device and an inner drill device. The outer drill device consists of an outer drill sleeve and an outer drill stirrer, and the inner drill device consists of an inner drill core rod, an inner drill blade and a drill bit. The outer drill stirrer consists of outer blades and inner blades, and the inner drill blade consists of two parts, i.e. upper blades and lower blades. The inner blades of the outer drill stirrer, the upper blades and the lower blades are each provided with at least one row, and the outer drill stirrer, the upper blades and the lower blades are distributed in an equal angular staggered manner. The outer blades can be spliced into different shapes, the operating directions of the outer drill device and the inner drill device are opposite, a feed port is located above the lower blades of the inner drill device, and the power transmission system is driven by an excavator power system. Also disclosed in the present invention is a method for reinforcing a shallow soft foundation with such a bidirectional overall stirring apparatus. By means of the design of the present invention, the efficiency is high, the construction is fast, and the soft foundation can be continuously reinforced as a whole.

Description

Two-way integral mixing equipment and method for strengthening shallow soft foundation by adopting it

Technical field

The invention relates to a technique for strengthening shallow soft foundations, in particular to a two-way integral mixing equipment and a method for strengthening shallow soft foundations by adopting the same.

Background technique

In recent years, with the rapid development of my country's highway engineering, various complex problems have emerged. Among them, the existence of weak foundations has brought certain tests to highway and bridge construction. Weak foundations include silt, silty soil, peat, peaty soil, etc. This type of soil has high natural water content, large void ratio, high compressibility, and low shear strength. If improperly handled, it is easy to cause road settlement or burial. Broken pipes and other problems. The common treatment methods in the project include replacement method, dump rock squeeze silt method, cushion method and dynamic compaction. However, these methods have some limitations, especially in urban road construction, environmental protection issues, construction period issues and site Restrictions and other issues have brought great challenges to traditional processing methods. At present, the commonly used cement-soil mixing pile method, such as a patented two-way cement-soil mixing pile (publication number CN205242387U), discloses a cement-soil mixing pile with internal and external drills reversed and bidirectional mixing. This kind of device still has the problems of uneven mixing of cement and soil and poor quality of piles; in addition, when dealing with shallow and weak foundations in road construction with a tight schedule, the advantages of its deep treatment appear to be "big material and small use". The construction process of "positioning of pile machine → mixing sinking → mixing lifting → pile formation → displacement of pile machine" is slow, and there will be a little soft soil between piles, which makes it difficult to achieve the effect of overall strengthening of weak foundations.

Summary of the invention

Object of the invention: The object of the present invention is to solve the problems of the existing two-way cement-soil mixer being unable to cope with the mixing of soft soil in various environments, there are still problems of uneven mixing of cement and soil, poor quality of piles, and the use of the existing two-way The cement-soil mixer cannot move flexibly when mixing and solidifying the soft soil, the construction process is slow, and there will be a little soft soil between the piles, which makes it difficult to achieve the problem of overall strengthening of the weak foundation. Technical solution: In order to solve the above problems, the present invention adopts the following technical solutions:

A two-way integral mixing equipment, including a fuselage, a frame, a mixing device, and an injection device. The mixing device includes a power transmission system, an outer drilling device and an inner drilling device. The injection device includes an injection pipe and a nozzle. One end of the manipulator is fixed On the fuselage, the other end is connected to the frame arranged in the vertical direction. The upper side of the frame is equipped with a power transmission system, and an outer drilling device and an inner drilling device are arranged under the power transmission system. The injection pipe is arranged inside the frame It is laid along the extension direction of the frame. One end of the injection pipe is connected to the external injector, and the other end is connected to the nozzle set above the lower blade of the inner drilling device. The inner drilling device and the outer drilling device are respectively connected to the power transmission system to rotate Two motors with opposite directions.

Further, the inner drilling device includes an inner core rod, an inner drill blade arranged on the inner core rod and arranged in a horizontal direction, and a drill bit arranged at the end of the inner core rod, and the outer drilling device includes an outer drill sleeve Tube and an outer drill agitator connected under the outer drill casing, the outer drill agitator includes an outer blade constituting the outer frame of the outer drill agitator and an inner blade arranged in the outer frame of the outer drill agitator formed by the outer blade; The drill blade comprises an upper blade arranged in the outer frame of the outer drill agitator and a lower blade under the outer frame of the outer drill agitator.

Further, the inner blade, the upper blade and the lower blade are all provided in at least one row.

Further, the horizontally arranged blades of the outer drilling device and the inner drilling device are staggered at equal angles.

Further, the outer frame of the outer drill agitator includes horizontal blades arranged in a horizontal direction and frame blades that can be joined and spliced into different shapes with the outer blades.

Further, the fuselage is an excavator fuselage, and the power transmission system is driven by the power system of the excavator.

A method for strengthening shallow soft ground with two-way integral mixing equipment, including the following steps:

1) Clean up the surrounding area of the construction site for the two-way integral mixing equipment;

2) Use a water pump to pump out the accumulated water in the upper part of the soft soil foundation;

3) Drive the excavator body to the required construction site by the power of the excavator body itself, and direct the mixing device to the required construction site;

4) Start the two-way integral mixing equipment, make the outer drilling device and the inner drilling device of the two-way integral mixing equipment run in reverse at the same time and insert them into the soft soil construction site, turn on the injection device, and spray the curing agent into the soft soil;

5) After mixing to the design depth for the first time, the two-way integrated mixing equipment moves flexibly around according to the predetermined route, and the mixing device can move up and down through the power transmission system to stir the entire foundation;

6) Reinforce and shape the soft soil foundation.

Further, in the step 4), the outer drilling device and the inner drilling device are inserted into the soft soil and stirred while the injection device is turned on and the curing agent is sprayed into the soft soil.

Further, in the step 5), the two-way integrated mixing equipment realizes flexible movement within the required construction range through the movement of the fuselage, the power transmission system to control the lifting of the outer drilling device and the inner drilling device, and the manipulation of the manipulator.

Compared with the prior art, the present invention has the following beneficial effects:

(1) Reinforce the shallow soft foundation as a whole, which is convenient and flexible in construction and has obvious reinforcement effects, avoiding the problem of residual soft soil;

(2) The two-way stirring of the outer drilling device and the inner drilling device can form a certain reinforcement range. The blades of different layouts ensure the uniformity of the mixing of the curing agent and the soft soil in the reinforcement range. The combination of the two ensures the solidification of the solidified body. Quality, and improve construction efficiency;

(3) The reinforcement method is flexible, and there is no need to frequently move the fuselage, which improves the construction efficiency and shortens the construction period;

(4) The construction equipment can be converted from conventional excavating machinery, which is easy to promote.

Description of the drawings

Figure 1 is a front view of the two-way integral mixing equipment of the present invention;

Figure 2 is a side view of the stirring device of the two-way integral stirring equipment of the present invention;

Figure 3 is a schematic diagram of the mixing blade of the present invention;

Figure 4 is a top view of the mixing blade of the present invention;

Figure 5 is a schematic diagram of Embodiment 2 of the present invention;

Figure 6 is a schematic diagram of Embodiment 3 of the present invention;

Figure 7 is a schematic diagram of longitudinal reinforcement row by row using the two-way integral mixing equipment of the present invention;

Fig. 8 is a schematic diagram of the two-way integral mixing equipment of the present invention being reinforced successively from the periphery to the center.

Explanation of labels in the figure: 1-frame, 2-frame, 3-power transmission system, 4-injection tube, 5-nozzle, 6-outer drill casing, 7-outer drill agitator, 71-outer blade, 72-inner blade, 711-frame blade, 8-inner drill device, 81-inner drill core rod, 82-inner drill blade, 821-upper blade, 822-lower blade, 83-drill, 9-manipulator.

Detailed ways

The patent of the present invention will be further described in detail below with reference to the drawings and specific embodiments.

Example 1:

Refer to Figure 1, Figure 2, Figure 3 and Figure 4.

A two-way integral mixing equipment, including a fuselage 1, a frame 2, a mixing device, and an injection device. The mixing device includes a power transmission system 3, an outer drilling device and an inner drilling device, and the injection device includes an injection pipe 4 and a nozzle 5 , One end of the manipulator 9 is fixed on the fuselage 1, and the other end is connected to the frame 2 arranged in the vertical direction. The upper side of the frame 2 is provided with a power transmission system 3, and an outer drilling device and an inner drilling device are arranged under the power transmission system 3. Drilling device, the injection pipe 4 is arranged inside the frame 2 and laid along the extension direction of the frame 2, one end of the injection pipe 4 is connected to an external injector (not shown), and the other end is connected and arranged under the inner drilling device The nozzle 5 above the blade 822, the inner drilling device and the outer drilling device are respectively connected to two motors (not shown) in the power transmission system 3 whose rotation directions are opposite to each other.

The inner drilling device includes an inner core rod 81, an inner drill blade 82 arranged on the inner core rod 81 and arranged in a horizontal direction, and a drill bit 83 arranged at the end of the inner core rod 81. The outer drilling device includes an outer drill sleeve The tube 6 and the outer drill agitator 7 connected below the outer drill casing. The outer drill agitator 7 includes an outer blade 71 constituting the outer frame of the outer drill agitator and an inner blade arranged in the outer frame of the outer drill agitator formed by the outer blade 71 Blade 72; The inner drill blade 82 includes an upper blade 821 provided in the outer frame of the outer drill agitator and a lower blade 822 below the outer frame of the outer drill agitator.

The inner blade 72 has two rows, the upper blade 821 has two rows, and the lower blade 822 has one row.

The horizontally arranged blades of the outer drilling device and the inner drilling device are staggered at equal angles. The angle of the interval here is 22.5°.

The outer frame of the outer drill agitator includes horizontal blades arranged in a horizontal direction and frame blades 711 that can be joined and spliced into different shapes with the outer blades.

The body 1 is an excavator body, and the power transmission system 3 is driven by the power system of the excavator.

Example 2:

Refer to Figure 5.

This embodiment is a further improvement to the first embodiment. The frame blade 711 is designed as a semicircle, and the horizontal blade of the outer blade 71 is matched to form an oval frame to adapt.

Example 3:

Refer to Figure 6.

This embodiment further improves on embodiment 1, and sets the lower blades 822 in two rows.

Example 4:

Refer to Figure 7 and Figure 8.

The outer drilling device and the inner drilling device are inserted into the soft soil and stirred while the injection device is turned on and the curing agent is sprayed into the soft soil.

The two-way integrated mixing equipment realizes flexible movement within the required construction range through the movement of the fuselage, the power transmission system to control the lifting of the outer drilling device and the inner drilling device, and the manipulation of the manipulator. As shown in Figure 7, the longitudinal reinforcement is adopted row by row, and in Figure 8 the reinforcement is adopted successively from the periphery to the center.

6) Reinforce and shape the soft soil foundation.

Claims

A two-way integral mixing equipment, which is characterized in that it includes a fuselage, a frame, a mixing device, and an injection device. The mixing device includes a power transmission system, an outer drilling device and an inner drilling device. The injection device includes an injection pipe and a nozzle. One end of the manipulator is fixed on the fuselage, and the other end is connected to the frame arranged in the vertical direction. The upper side of the frame is equipped with a power transmission system, and an outer drilling device and an inner drilling device are arranged under the power transmission system. The injection pipe is arranged Lay inside the frame and along the extension direction of the frame. One end of the injection pipe is connected to the external injector, and the other end is connected to the nozzle set above the lower blade of the inner drilling device. The inner drilling device and the outer drilling device are respectively connected to the power Two motors in the transmission system whose rotation directions are opposite to each other.
The two-way integral mixing equipment according to claim 1, characterized in that: the inner drilling device comprises an inner core rod, an inner drill blade arranged on the inner core rod and arranged in a horizontal direction, and an inner drill blade arranged at the end of the inner core rod The outer drill device includes an outer drill casing and an outer drill agitator connected below the outer drill casing. The outer drill agitator includes an outer blade that forms the outer frame of the outer drill agitator and an outer blade formed by the outer blade. The inner blade in the outer frame of the drill agitator; the inner drill blade includes an upper blade arranged in the outer frame of the outer drill agitator and a lower blade under the outer frame of the outer drill agitator.
The two-way integral mixing equipment according to claim 1 or 2, wherein the inner blade, the upper blade and the lower blade are all provided in at least one row.
The two-way integral mixing equipment according to claim 1 or 2, characterized in that the blades of the outer drilling device and the inner drilling device arranged in the horizontal direction are staggered at an equal angle.
The two-way integral mixing equipment according to claim 1, wherein the body is an excavator body, and the power transmission system is driven by the power system of the excavator.
The two-way integrated mixing equipment according to claim 2, wherein the outer frame of the outer drill agitator includes horizontal blades arranged in a horizontal direction and frame blades that can be joined and spliced into different shapes with the outer blades.
A method for strengthening shallow soft foundations with two-way integral mixing equipment according to claim 1, characterized in that it comprises the following steps:

1) Clean up the surrounding area of the construction site for the two-way integral mixing equipment;

2) Use a water pump to pump out the accumulated water in the upper part of the soft soil foundation;

3) Drive the excavator body to the required construction site by the power of the excavator body itself, and direct the mixing device to the required construction site;

4) Start the two-way integral mixing equipment, make the outer drilling device and the inner drilling device of the two-way integral mixing equipment run in reverse at the same time and insert them into the soft soil construction site, turn on the injection device, and spray the curing agent into the soft soil;

5) After mixing to the design depth for the first time, the two-way integrated mixing equipment moves flexibly around according to the predetermined route, and the mixing device can move up and down through the power transmission system to stir the entire foundation;

6) Reinforce and shape the soft soil foundation.
The method for strengthening shallow soft foundations with two-way integrated mixing equipment according to claim 7, characterized in that: in step 4), the outer drilling device and the inner drilling device are inserted into the soft soil and stirred while the injection device is turned on and directed Spray the curing agent into the soft soil.
The method for strengthening shallow soft foundations with two-way integrated mixing equipment according to claim 7, characterized in that: in said step 5), the two-way integrated mixing equipment controls the outer drilling device and the inner drilling through the movement of the fuselage and the power transmission system. The lifting of the device and the manipulation of the manipulator can achieve flexible movement within the required construction range.