CN111851527B

CN111851527B - Foundation trench backfill construction method based on premixed fluidized solidified soil

Info

Publication number: CN111851527B
Application number: CN202010735217.2A
Authority: CN
Inventors: 范璐璐; 刘忠; 涂亮亮; 刘铁军; 陈建友; 侯勇勇
Original assignee: Shenzhen Tianjian Asphalt Road Engineering Co ltd; Shenzhen Municipal Engineering Corp
Current assignee: Shenzhen Tianjian Asphalt Road Engineering Co ltd; Shenzhen Municipal Engineering Corp
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2022-03-22
Anticipated expiration: 2040-07-28
Also published as: CN111851527A

Abstract

The invention relates to the technical field of foundation trench backfill, and discloses a foundation trench backfill construction method based on premixed fluid-state solidified soil, which comprises the following steps: before backfilling the foundation trench, cleaning to the elevation of the bottom surface of the foundation, and cleaning fallen loose garbage, mortar and stone sundries; inspecting the quality of the backfilled fluid-state solidified soil; backfilling the fluid solidified soil; after the soil filling is completed, the surface is leveled by pulling lines, and the soil is shoveled according to the lines in time when the surface exceeds the standard elevation; in places lower than the standard elevation, soil should be supplemented and tamped; measuring the mass density of the dry soil; when the mass density meets the specified requirements, layer soil is laid above the fluid-state solidified soil, and in the process of backfilling the foundation trench, the backfilled fluid-state solidified soil has the advantages of high compactness, high shear strength and high compressive strength.

Description

Foundation trench backfill construction method based on premixed fluidized solidified soil

Technical Field

The invention relates to the technical field of foundation trench backfill, in particular to a foundation trench backfill construction method based on premixed flow state solidified soil.

Background

In the building engineering construction, subway construction, exploration, pile foundation, well drilling and excavation of underground foundation pits, a large amount of waste residual soil is generated, and the waste residual soil is a multiphase stable colloidal suspension containing clay, organic and inorganic material additives, sump oil and drill cuttings, and has quite complex components.

The building material which is developed vigorously in China and has the profound historical significance of saving energy, saving soil, utilizing waste, protecting environment and improving building functions is a major measure for realizing sustainable development and is also left in the millennium industry of descendants, mud and sand are separated from residual mud and residue soil by a water washing method, the sand is used as a building material for self use, impurities are removed from the mud, and a curing reinforcing agent and a drying anti-cracking agent are added to prepare pre-flowing state cured soil for backfilling.

The foundation trench is a trench with a trench bottom width within 3 meters and a trench length greater than 3 times the trench width, and in the prior art, earthwork is generally directly filled into the foundation trench when the foundation trench is backfilled, but because the earthwork has poor waterproof and anti-seepage performance, the problems of water seepage and water leakage of the foundation trench can occur in subsequent construction, and further the construction quality of the foundation trench is affected.

Disclosure of Invention

The invention aims to provide a foundation trench backfill construction method based on premixed fluid-state solidified soil, and aims to solve the problems of water seepage and water leakage of earthwork in the foundation trench backfill process in the prior art.

The invention is realized in this way, and the construction method for backfilling foundation trench based on premixed fluid solidified soil comprises the following steps:

s1, before backfilling the foundation trench, cleaning to the elevation of the bottom surface of the foundation, and cleaning fallen loose garbage, mortar and stone sundries;

s2, checking the quality of the backfilled fluid solidified soil, including whether the backfilled fluid solidified soil is free of impurities and the particle size meets the requirements and whether the water content of the fluid solidified soil is in a control range;

s3, backfilling the fluid solidified soil;

s4, after the soil filling is completed, leveling the surface by drawing lines, and leveling the surface according to the lines in time when the surface exceeds the standard elevation; and (5) filling and tamping soil below the standard elevation.

S5, performing cutting ring sampling according to the specification, and measuring the mass density of the dry soil; and after the mass density meets the specified requirements, paving layer soil above the fluid solidified soil, and finishing the construction of the foundation trench.

Furthermore, the fluid solidified soil is prepared by mixing and stirring soil, water, a curing agent and an expanding agent, and in the preparation process, 120 parts of soil, 10 parts of water, 2 parts of curing agent and 1 part of expanding agent are taken.

Further, the curing agent mainly comprises the following components: 5-20% of sulfate; 5-15% of silicate; 1-10% of cement; 1-5% of fluorosilicate; 1-10% of silicon oxide; 1-10% of calcium oxide; 1-5% of limestone; 1-10% of aluminum oxide.

Further, in the step 3), in the process of backfilling the fluidized solidified soil into the foundation trench, backfilling layer by layer is adopted, and then after each layer is paved, raking is carried out; and circulating the steps until the height of the last layer of fluid state solidified soil exceeds the standard elevation.

Furthermore, after each layer of fluid state solidified soil is paved and leveled, manual work or a machine is adopted for tamping, and after tamping, the next layer of fluid state solidified soil is backfilled.

Furthermore, the thickness of each layer of the fluid-state solidified soil is between 150mm and 220 mm.

Further, in the step 2), roughening treatment is performed on the bottom of the base groove, and a clay layer is laid on the bottom of the base groove and the side wall of the base groove.

Further, in the step 3), in the process of backfilling the fluid solidified soil, backfilling is started from the lowest end of the foundation trench, and the backfilling is performed layer by layer from one end of the foundation trench to the other end of the foundation trench from bottom to top.

Further, when the foundation trench is backfilled, the backfilling and tamping should be performed on both sides or the periphery of the building at the same time, so as to keep the backfilling heights of the plurality of foundation trenches consistent.

Further, in the step 5), after the fluid solidified soil is solidified, sampling by the cutting ring to test the mass density.

Compared with the prior art, the backfill construction method of the foundation trench based on the premixed fluid-state solidified soil has the advantages that the backfill fluid-state solidified soil has high compactness, high shear strength and high compressive strength in the backfill process of the foundation trench, and the fluid-state solidified soil is not disintegrated after being soaked in water at normal temperature after being solidified, has good water stability and durability, and improves the performance of the foundation trench, thereby ensuring the construction effect.

Drawings

FIG. 1 is a schematic flow chart illustrating steps of a foundation trench backfilling construction method based on premixed fluid solidified soil provided by the invention;

FIG. 2 is a schematic flow chart illustrating the steps of the method for mixing and making the premixed fluidized solidified soil provided by the present invention;

FIG. 3 is a schematic front view of a mixing pan and a stirrer according to a first embodiment of the construction method for backfilling a foundation trench based on premixed fluid solidified soil provided by the present invention;

FIG. 4 is a schematic perspective view of a second embodiment provided by the present invention;

FIG. 5 is a perspective view of a stirring section of the stirrer according to the present invention;

FIG. 6 is an enlarged schematic view of the stirring blade of the stirrer according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1 to 6, preferred embodiments of the present invention are shown.

The foundation trench backfill construction method based on premixed fluidized solidified soil comprises the following manufacturing steps:

s3, backfilling the fluid solidified soil;

The stirring method for the premixed fluidized solidified soil is not only used for backfilling the foundation trench, but also can be used for backfilling pipe ditches, mine goafs and the like.

According to the construction method for backfilling the foundation trench based on the premixed fluid-state solidified soil, in the process of backfilling the foundation trench, the backfilled fluid-state solidified soil has the advantages of high compactness, high shear strength and high compressive strength, and after the fluid-state solidified soil is solidified, the fluid-state solidified soil is not disintegrated after being soaked in water at normal temperature, so that the water stability and the durability are good, the strength of the foundation trench is improved, and the construction effect is guaranteed.

Specifically, the fluid solidified soil is prepared by mixing and stirring soil, water, a curing agent and an expanding agent, and in the preparation process, 120 parts of soil, 10 parts of water, 2 parts of the curing agent and 1 part of the expanding agent are taken.

The concrete steps of stirring the fluid solidified soil comprise screening out soil from waste sludge and residue soil, crushing and screening the soil to obtain soil grains with the grain size less than 4 mm;

s2, adding water into the mixing pot, adding the curing agent into the mixing pot, and starting the stirrer to stir for 30S;

s3, adding the soil materials according to the proportion, and dividing the soil materials into a plurality of groups in the process of adding the soil materials, wherein the soil materials are added for a plurality of times; after the first group of soil materials are added, adding the next group of soil materials under the condition of keeping the continuous stirring of the stirrer until the soil materials are completely added into the stirring pot;

the time interval of adding into mixing the pot for adjacent two sets of soil material is 20s, that is to say, after adding first group soil material, the agitator stirring 20s, then carry out the interpolation of next group soil material again, the benefit of doing so is, compare prior art once only add the soil material in mixing the pot, soil can mix with water better, stir more comprehensively, evenly, fine and smooth, be convenient for follow-up pouring into flow state solidified soil, like this, the flow state solidified soil who makes also can reach better construction effect.

In the aspect of putting time, the time for putting each group of soil materials is 25s, each group of soil materials is not directly put into the mixing pot at one time, but the soil is slowly poured into the mixing pot, and the stirrer 100 continuously stirs in the pouring process, so that the soil is further conveniently blended into the water.

And S4, adding the expanding agent into the stirring pot, stirring for 40S by using a stirrer, and finishing the preparation of the fluid solidified soil.

The curing agent comprises the following main components: 5-20% of sulfate; 5-15% of silicate; 1-10% of cement; 1-5% of fluorosilicate; 1-10% of silicon oxide; 1-10% of calcium oxide; 1-5% of limestone; 1-10% of aluminum oxide.

The curing agent is a novel high-tech building material, has the characteristics of no pollution, difficult combustion, long-term storage and the like, and can generate a series of physical and chemical changes after acting on soil, so that original loose soil particles form a whole with a compact structure, thereby improving the strength and compactness and improving the bearing capacity of a wall body.

The curing agent is widely distributed, and cheap soil is used as a main raw material, can replace traditional building materials such as river sand, stones, lime-fly-ash broken stones and the like, is currently applied to a plurality of fields, such as municipal roads, factory roads, sidewalks, roadbed of airport runways and foundation treatment of various building fields, and can also be used for ramming earth walls, archaeological excavation and other places needing soil stabilization.

In addition, the strength, compactness, shearing strength and the like of the modern rammed earth wall treated by the curing agent all reach and exceed the acceptance standards of building materials, so that the modern rammed earth wall can withstand the examination of time, the service life of the rammed earth wall is prolonged, and the living safety of people is guaranteed.

In addition, the curing agent is added into the soil, so that the road building cost is saved, and the construction period is shortened. Compared with the road building by using the traditional road base material, the road building cost can be saved by 30-50 percent, and the working period can be shortened by about 50 percent.

The compressive strength is high: under the condition of not changing construction conditions, the unconfined compressive strength can be improved by 40-100%.

The water stability is good: the curing agent composite consolidated soil test piece does not disintegrate in water immersion at normal temperature, and has good water stability and durability.

The freeze stability is good, energy-conserving environmental protection: the traditional road building material damages vegetation and pollutes the environment, particularly lime and cement production consumes a large amount of coal resources and releases a large amount of carbon dioxide greenhouse gas, thereby intensifying the global greenhouse effect. The technology reduces the usage amount of the traditional cementing materials, is beneficial to saving resources and energy sources and protecting the ecological environment, can destroy the nature when digging a river to collect sand and blasting mountain and broken stone, pollutes the environment, replaces the sand and stone materials with the soil which is widely distributed and can be recommended everywhere by adopting the technology, is beneficial to the sustainable development of roads, and meets the requirements of building a resource-saving and environment-friendly society in China.

In addition, the production and the use of the soil curing agent are pollution-free, and the diluted curing agent aqueous solution is non-toxic and harmless, belongs to an environment-friendly and resource-saving high-tech new material, and can effectively solve the problem of pollution of road building materials.

The construction process is simple: the curing agent has good permeability and good workability with soil, so that the soil is easy to compact and convenient to construct, the used construction machinery is basically the same as the traditional mechanical equipment for road construction, the labor demand is reduced, the construction process is simple, and workers can be put on duty only by simple training.

The service life of the road can be prolonged, and the later maintenance cost is reduced: the strength, compactness, resilience modulus, deflection value, cbr, shearing strength and the like of the soil treated by the curing agent are greatly improved, and the surface layer is not influenced by natural conditions such as heat, frost or moisture, so that the service life of a road is prolonged, and the engineering maintenance cost is saved.

Has wide practicability: compared with the traditional soil cementing materials such as cement, lime and the like, the soil cementing material has better performance and economic and environmental benefits, can also solve some special problems which are difficult to solve when the soil is consolidated by the cementing materials such as cement, lime, fly ash and the like, has unique soil solidification effect and wide practicability, and is widely applied to the fields of treatment of base layers and subbase layers of roads, building foundations and the like.

Convenient to use, easily transportation and storage: high concentration, less consumption, low transportation cost and large supply radius; can be stored for more than one year at room temperature without combustion and explosion.

The method is characterized in that: the road has the advantages of low road building cost, energy conservation, environmental protection, high compressive strength, good water stability, easy mastering of construction, good road performance, long service life, wide application range, high bearing capacity and low energy consumption.

The application range is as follows: building a base layer and a subbase layer of each grade of road; and (5) flattening and solidifying the field. Such as parking lots, storage yards, playgrounds, etc.; baking-free bricks of soil curing agents; dam filling and solidifying in hydraulic engineering; the original ecological road without a surface layer is suitable for all places needing original ecological pavements, such as green ecological parks, scenic spots, farming and forestry pasturing areas, golf fields and the like; and (3) a soil curing agent wall. The wall has the characteristics of small temperature difference, slow heat dissipation, water vapor soaking resistance and the like, and is suitable for building walls in various greenhouses.

The application range is very wide, and the composite material can be used for reinforcing road base layers, bottom layers and surface layers, and can also be applied to the fields of foundation treatment of various buildings, geological disaster prevention and control, seepage prevention and leakage stoppage of hydraulic and hydroelectric engineering, oil field grouting, methane tanks and the like.

In the step 3), backfilling layer by layer is adopted in the process of backfilling the fluidized solidified soil into the foundation trench, and then after each layer is paved, raking is carried out; and circulating the steps until the height of the last layer of fluid state solidified soil exceeds the standard elevation.

After each layer of the fluid state solidified soil is paved and leveled, tamping is carried out by manpower or a machine, and after tamping, backfilling of the next layer of the fluid state solidified soil is carried out.

The thickness of each layer of the fluid solidified soil is 150 mm-220 mm.

In the step 2), the groove bottom of the foundation groove is roughened, and a clay layer is laid on the groove bottom of the foundation groove and the side wall of the foundation groove, so that the adhesion between the fluid state solidified soil and the side wall of the foundation groove can be enhanced.

In the step 3), in the process of backfilling the fluidized solidified soil, backfilling is started from the lowest end of the foundation trench, and the backfilling is performed layer by layer from bottom to top from one end of the foundation trench to the other end of the foundation trench.

When the foundation trench is backfilled, the backfilling and tamping should be simultaneously carried out on two sides or the periphery of the building, and the backfilling heights of a plurality of foundation trenches are kept consistent.

And in the step 5), after the fluid solidified soil is solidified, sampling by using a cutting ring to test the mass density.

In the first embodiment, as shown in fig. 3, the mixing pan 20 has a cavity therein, and the mixing pan 20 has an opening arranged upward, and the opening is communicated with the cavity; the side wall of the mixing pot 20 is provided with a first fixing piece and a second fixing piece, the first fixing piece and the second fixing piece are connected, a connecting line between two points of the first fixing piece and the second fixing piece passes through the circle center of the mixing pot 20, the first fixing piece is connected with a first inhaul cable 30, the other end of the first inhaul cable 30 is fixedly connected with a first driving device, the second fixing piece is connected with a second inhaul cable 31, the other end of the second inhaul cable 31 is connected with a second driving device, the first driving device can drive the first inhaul cable 30 to swing, the second driving device can drive the second inhaul cable 31 to swing, and the first inhaul cable 30 and the second inhaul cable 31 can drive the mixing pot 20 to swing.

Specifically, the movement frequencies of the first driving device and the second driving device are consistent, and the movement directions of the first driving device and the second driving device are consistent, that is, the first driving device and the second driving device simultaneously swing to the right or simultaneously swing to the left, so that the curing agent, the soil material, the expanding agent and the water are mixed, and the automatic stirring effect on the fluid curing soil in the stirring pot 20 is achieved.

Like this, when first drive arrangement and second drive arrangement function, be located the first cable 30 and the second cable 31 of mixing pot 20 both sides and drive respectively and mix the pot 20 and rock back and forth to be convenient for mix the cooperation between curing agent, native material, inflation agent and the water in the pot 20, on the other hand, can also realize mixing the system automatically to curing agent, native material, inflation agent and water, need not manual stirring, liberation manpower.

Specifically, the first driving device comprises a first motor, a rotating shaft of the first motor is provided with a first eccentric wheel 40, and the end of the first cable 30 is fixedly arranged on the first eccentric wheel 40; the second driving device comprises a second motor, a rotating shaft of the second motor is provided with a second eccentric wheel 41, and the end head of the second inhaul cable 31 is fixedly arranged on the second eccentric wheel 41; when the first eccentric wheel 40 and the second eccentric wheel 41 rotate, the mixing pan 20 swings back and forth up and down.

The first eccentric wheel 40 and the second eccentric wheel 41 are vertically arranged, and during the rotation of the first eccentric wheel 40 and the second eccentric wheel 41, due to the eccentric action of the eccentric wheels, the first eccentric wheel 40 and the second eccentric wheel 41 can adjust the mixing pan 20 in height and length, specifically, X, Z space rectangular coordinate systems are respectively defined, and the mixing pan 20 can be adjusted in the X-axis direction and the Y-axis direction through the rotation of the first eccentric wheel 40 and the second eccentric wheel 41.

In order to prevent the first eccentric wheel 40 and the second eccentric wheel 41 from interfering during the rotation, the rotation directions of the first eccentric wheel 40 and the second eccentric wheel 41 are defined to be identical, and the rotation frequency and the rotation angle of the two are identical.

Furthermore, in order to adjust the movement of the mixing pan 20 in the Y-axis direction, a first moving block 50 is disposed below the first motor, the first motor and the first moving block 50 are fixedly disposed, the first moving block 50 reciprocates left and right on one side of the mixing pan 20, a second moving block 51 is disposed below the second motor, the second motor and the second moving block 51 are fixedly disposed, and the second moving block 51 reciprocates left and right on the other side of the mixing pan 20.

The first moving block 50 and the second moving block 51 move in the same direction.

Through the cooperation between first eccentric wheel 40, second eccentric wheel 41, first movable block 50 and the second movable block 51 to realize mixing pot 20 at X, Y, Z three ascending swings of axle, mix the fluid state solidification soil more comprehensively, diversely, and then promote the system effect of mixing to the fluid state solidification soil in mixing pot 20.

The stirrer 100 further includes a supporting rod 60 and a stirring claw, as shown in fig. 3, the stirring claw is disposed at the end of the supporting rod 60 and extends to the inside of the stirring pan 20, the stirring claw is used for stirring the fluid-state solidified soil in the stirring pan 20, and in the process of stirring the fluid-state solidified soil, the stirring claw is disposed inside the stirring pan 20 under multi-directional shaking of the stirring pan 20 itself, and the stirring claw does not need to be stirred and moves relative to the fluid-state solidified soil in the stirring pan 20, so that stirring of the fluid-state solidified soil in the stirring pan 20 can be achieved.

The agitator 100 may move along with the first movable block 50 so that the agitator 100 is not separated from the mixing pan 20 when the mixing pan 20 is shaken.

Certainly, the stirring claws can also independently grip and stir the fluid state solidified soil, so that the better stirring effect of the fluid state solidified soil is achieved by matching with the shaking of the stirring pot 20.

The stirring claw comprises a plurality of grippers 61 which are dispersedly arranged, a plurality of stirring rods are arranged on the side wall of each gripper 61, the stirring rods are arranged at intervals and face towards different directions in a vacant mode respectively, the contact area between the stirring claws and the fluid state solidified soil is enlarged, and the stirring effect on the fluid state solidified soil is further improved.

In the stirring process, the supporting rod 60 can rotate, and the supporting rod 60 drives the stirring claws at the end part to rotate, so that the stirring efficiency is improved.

The supporting rod 60 is telescopic, and the distance between the stirring claw and the bottom of the stirring pan 20 is adjusted through telescopic; when the amount of the fluid-state solidified soil in the mixing pan 20 is large, the support rod 60 can be contracted upwards to stir the middle area of the fluid-state solidified soil, and when the amount of the fluid-state solidified soil in the mixing pan 20 is small, the support rod 60 can be extended towards the bottom of the mixing pan 20 until the support rod is contacted with the fluid-state solidified soil.

In order to enhance the stability of the mixing pan 20 in the reciprocating shaking process, a limiting device is arranged at the bottom of the mixing pan 20 and is a universal wheel 71, a movable sleeve 70 is sleeved on the periphery of the universal wheel 71, the movable sleeve 70 rotates around the universal wheel 71 in all directions, and the upper end of the movable sleeve 70 is fixedly arranged at the bottom of the mixing pan 20, so that when the mixing pan 20 swings towards X, Y shaft in any direction, the limiting device does not influence the swing of the mixing pan, but can play a role in limiting the position of the mixing pan 20, and the mixing pan 20 does not depart from the limiting device, thereby avoiding the problems that the mixing pan 20 spills materials and the mixing pan 20 shakes uncontrollably in the swinging process.

The bottom of the limiting device is further provided with a spring column 72, when the mixing pan 20 is driven by the first eccentric wheel 40 and the second eccentric wheel 41 to move along the Z-axis direction, the spring column 72 can stretch and retract without affecting the shaking of the mixing pan 20 in the Z-axis direction, when the mixing pan 20 stops swinging, the shape of the spring column 72 is restored, the functions of supporting and fixing the mixing pan 20 are continuously exerted, and the swinging of the mixing pan 20 in three directions X, Y, Z is not interfered while the stability of the mixing pan 20 is improved.

Another advantage of providing the spring post 72 is that when the mixing pan 20 moves in the Y axis direction under the traction of the first moving block 50 and the second moving block 51, the spring post 72 is elongated, and the movement of the mixing pan 20 is not affected, and after the stirring is completed, the first moving block 50 and the second moving block 51 stop operating, the spring post 72 restores to the vertical arrangement state, the mixing pan 20 is located right above the spring post 72, and the spring post 72 supports the mixing pan 20, and is in a more stable state at this time.

In the second embodiment, as shown in fig. 4, the stirrer 100 is disposed above the stirring pan 20, the stirrer 100 includes a support rod and a stirring portion, and the stirring portion is formed at the end of the support rod 60; a plurality of stirring blades 63 are formed below the stirring part, and the stirring blades 63 are arranged at intervals along the circumferential direction of the stirring part; the stirring blade 63 is arranged opposite to the stirring pan 20 and is arranged in the containing cavity of the stirring pan 20.

A cover plate 69 is arranged on the support rod 60, the middle part of the cover plate 69 is recessed towards the direction away from the cavity to form a recessed groove, the cover plate 69 is provided with a second opening arranged towards the cavity, and the second opening is communicated with the recessed groove; the outer diameter of the cover 69 is larger than the inner diameter of the opening of the mixing pan 20, so that the fluidized solidified soil in the mixing pan 20 is prevented from splashing to the outside of the mixing pan 20 during the mixing process of the mixing blades 63.

In the process of making and stirring the fluid solidified soil in the mixing pot 20, the support rod 60 rotates to drive the stirring blades 63 on the stirring part to rotate, and the stirring blades 63 stir the solidifying agent, the soil material, the expanding agent and the water in the mixing pot 20.

In order to stir the materials close to the inner side wall of the mixing pan 20 as much as possible, the supporting rod 60 can be contracted, and the stirring blade 63 can be placed at the most proper position in the mixing pan 20 by adjusting the supporting rod 60, so that the curing agent, the soil material, the expanding agent and the water can be stirred better.

In addition, the bottom of the stirring blade 63 is arranged close to the bottom wall of the stirring pan 20, a gap is formed between the bottom of the stirring blade 63 and the bottom wall of the stirring pan 20, and the stirring blade 63 is close to the inner side wall of the stirring pan 20 as much as possible, so that a larger stirring area is obtained, and interference between the stirring blade 63 and the bottom wall of the stirring pan 20 is avoided.

In order to further increase the stirring efficiency of the stirring vanes 63, the stirring vanes 63 include a front side and a rear side, and the stirring vanes 63 rotate in the rear-to-front direction; the rear side of the stirring blade 63 is bent towards the middle part of the stirring pan 20 to form a blocking partition wall 65; in the rotation process of the stirring blade 63, the blocking wall 65 can better drive the rotation of the pre-mixed fluid solidified soil in the stirring pot 20, when the stirring blade 63 rotates, and the blocking wall 65 is positioned at one side of the rear end of the stirring blade 63, in the stirring process of the stirring blade 63, the stirring blade 63 rotates, the material close to the bottom wall of the stirring pot 20 is scraped by the front side of the stirring blade 63, and then the blocking wall 65 drives the material to rotate and mix.

Along the direction of stirring pot 20, stirring leaf 63 is the interior heliciform and arranges, that is to say, increases the ascending length of stirring leaf 63 vertical direction to the stirring radiation scope of increase stirring leaf 63 further promotes stirring efficiency and mixing effect.

As shown in fig. 5, along the length direction of the stirring blade 63, the friction increasing strips 64 are disposed in the middle of the inner side wall of the stirring blade 63, and the friction increasing strips 64 protrude out of the inner side wall of the stirring blade 63 and are arranged in an S-shaped bent manner, so as to further facilitate driving the premixed fluid solidified soil.

The middle part of the stirring blade 63 is bent outwards, the stirring blade 63 is arranged in an arc surface shape, and the bent radian of the stirring blade 63 is consistent with the radian of the inner side wall of the stirring pot 20; when the stirring blade 63 is placed in the stirring pan 20, the outer side wall of the stirring blade 63 is arranged close to the inner side wall of the stirring pan 20, so that the stirring range of the stirring blade 63 in the rotating process is further enlarged.

Moreover, a feeding device is arranged above the stirring blades 63, the feeding device comprises a conveyor belt, the front end of the conveyor belt is arranged right above the stirring pot 20, the conveyor belt is conveyed from the rear end to the front end, soil is placed at the rear end of the conveyor belt in the process of feeding the materials into the stirring pot 20, and the soil falls into the stirring pot 20 from the front end under the driving of the conveyor belt; in step 3, a set of earth material may be inserted every 20 seconds towards the rear end of the conveyor belt.

In order to enable the soil to slowly fall into the mixing pot 20, when the soil is placed on the conveyor belt, the soil can be placed in a strip shape instead of a pile shape, and the conveying speed of the conveyor belt is adjusted, so that a group of soil can be completely conveyed into the mixing pot 20 just after the conveyor belt conveys the soil for 20 s.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A foundation trench backfill construction method based on premixed fluid solidified soil is characterized by comprising the following manufacturing steps:

s3, backfilling the fluid solidified soil;

s4, after the soil filling is completed, leveling the surface by drawing lines, and leveling the surface according to the lines in time when the surface exceeds the standard elevation; in places lower than the standard elevation, soil should be supplemented and tamped;

s5, performing cutting ring sampling according to the specification, and measuring the mass density of the dry soil; after the mass density reaches the specified requirement, paving layer soil above the fluid solidified soil, and finishing the construction of the foundation trench;

the fluid solidified soil is prepared by mixing and stirring soil material, water, a curing agent and an expanding agent, and in the preparation process, 120 parts of soil material, 10 parts of water, 2 parts of curing agent and 1 part of expanding agent are taken;

the curing agent mainly comprises the following components: 5-20% of sulfate; 5-15% of silicate; 1-10% of cement; 1-5% of fluorosilicate; 1-10% of silicon oxide; 1-10% of calcium oxide; 1-5% of limestone; 1-10% of aluminum oxide;

the concrete steps of stirring the fluid solidified soil comprise:

s01, crushing and screening the soil material screened from the waste residue soil to obtain soil particles with the particle size of less than 4 mm;

s02, adding water into a mixing pot, adding the curing agent into the mixing pot, and starting a stirrer to stir for 30S;

s03, adding the soil materials according to the proportion, and dividing the soil materials into a plurality of groups in the process of adding the soil materials, wherein the soil materials are added for a plurality of times; after the first group of soil materials are added, adding the next group of soil materials under the condition of keeping the continuous stirring of the stirrer until the soil materials are completely added into the stirring pot;

s04, adding an expanding agent into the stirring pot, and stirring for 40S by using a stirrer to complete the preparation of the fluid solidified soil;

the stirring pot is internally provided with a containing cavity, the stirring pot is provided with an opening which is arranged upwards, and the opening is communicated with the containing cavity; a first fixing piece and a second fixing piece are arranged on the side wall of the mixing pot, a connecting line between two points of the first fixing piece and the second fixing piece passes through the center of the mixing pot, a first inhaul cable is connected to the first fixing piece, the other end of the first inhaul cable is fixedly connected with a first driving device, a second inhaul cable is connected to the second fixing piece, the other end of the second inhaul cable is connected with a second driving device, the first driving device drives the first inhaul cable to swing, the second driving device drives the second inhaul cable to swing, and the first inhaul cable and the second inhaul cable drive the mixing pot to swing;

the movement frequencies of the first driving device and the second driving device are consistent, and the movement directions of the first driving device and the second driving device are consistent;

the first driving device comprises a first motor, a rotating shaft of the first motor is provided with a first eccentric wheel, and the end head of the first inhaul cable is fixedly arranged on the first eccentric wheel; the second driving device comprises a second motor, a rotating shaft of the second motor is provided with a second eccentric wheel, and the end of the second inhaul cable is fixedly arranged on the second eccentric wheel; when the first eccentric wheel and the second eccentric wheel rotate, the stirring pot swings up and down;

the rotating directions of the first eccentric wheel and the second eccentric wheel are defined to be consistent, and the rotating frequency and the rotating angle of the first eccentric wheel and the second eccentric wheel are consistent;

a first moving block is arranged below the first motor, the first motor and the first moving block are fixedly arranged, the first moving block moves left and right in a reciprocating mode on one side of the mixing pot, a second moving block is arranged below the second motor, the second motor and the second moving block are fixedly arranged, and the second moving block moves left and right in a reciprocating mode on the other side of the mixing pot;

the moving directions of the first moving block and the second moving block are consistent;

the bottom of the mixing pot is provided with a limiting device which is a universal wheel, the periphery of the universal wheel is sleeved with a movable sleeve, the movable sleeve rotates around the universal wheel in all directions, and the upper end of the movable sleeve is fixedly arranged with the bottom of the mixing pot;

the bottom of the limiting device is also provided with a spring column, and when the mixing pot moves along the Z-axis direction under the driving of the first eccentric wheel and the second eccentric wheel, the spring column can stretch and retract;

the stirrer is arranged above the stirring pot and comprises a supporting rod and a stirring part, and the stirring part is formed at the tail end of the supporting rod; a plurality of stirring blades are formed below the stirring part and are arranged at intervals along the circumferential direction of the stirring part; the stirring blades are arranged opposite to the stirring pot and are arranged in the accommodating cavity of the stirring pot;

in the process of making and stirring the fluid state solidified soil in the stirring pot, the supporting rod rotates to drive the stirring blades on the stirring part to rotate;

the stirring blade comprises a front side and a rear side, and the stirring blade rotates along the direction from the rear side to the front side; the rear side of the stirring blade is bent towards the middle part of the stirring pot to form a baffle wall;

the edge the length direction of stirring leaf, the middle part of the inside wall of stirring leaf is provided with increases the rubbing strip, it bulges to increase the rubbing strip the inside wall of stirring leaf is the S type and buckles and arranges.

2. The backfill construction method for foundation trench based on premixed fluid solidified soil according to claim 1, characterized in that in step 3), during the backfill of fluid solidified soil into the foundation trench, the backfill is performed layer by layer, and then each layer is spread and then raked; and circulating the steps until the height of the last layer of fluid state solidified soil exceeds the standard elevation.

3. The foundation trench backfill construction method based on premixed fluid solidified soil according to claim 2, wherein each layer of fluid solidified soil is compacted manually or by a machine after being spread and leveled, and the next layer of fluid solidified soil is backfilled after being compacted.

4. The backfill construction method for foundation trench based on premixed fluid solidified soil according to claim 2, wherein the thickness of each layer of fluid solidified soil is between 150mm and 220 mm.

5. The backfill construction method for foundation trench based on premixed solidified fluidized soil according to claim 1, wherein in step 2), the bottom of the foundation trench is roughened, and a clay layer is laid on the bottom of the foundation trench and the sidewalls of the foundation trench.

6. The backfill construction method for foundation trench based on premixed fluid solidified soil according to claim 1, wherein in the step 3), the backfill is started from the lowest end of the foundation trench and is performed layer by layer from bottom to top from one end of the foundation trench to the other end in the backfill process of the fluid solidified soil.

7. The foundation trench backfill construction method based on premixed fluid solidified soil according to claim 1, wherein in the step 3), when the foundation trench is backfilled, the backfilling and tamping should be simultaneously performed on two sides or the periphery of the building, so as to keep the backfilling heights of the plurality of foundation trenches consistent.

8. The backfill construction method for foundation trench based on premixed solidified fluid soil according to claim 1, wherein in step 5), after the solidified fluid soil is solidified, the cutting ring is used for sampling to test the mass density.