CN111894055A - Construction method for correcting deviation and reducing settlement of building by using EPS light soil - Google Patents
Construction method for correcting deviation and reducing settlement of building by using EPS light soil Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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Abstract
The invention provides a construction method for rectifying deviation and reducing settlement of a building by using EPS light soil, which comprises the following steps: 1. determining a deviation correction parameter; 2. constructing an isolation load shedding mechanism to obtain the grout sealing wall and a grout sealing layer; 3. constructing a floating support anti-sinking mechanism, namely injecting EPS light soil slurry into the slurry spraying hole and the pressure relief hole, and uniformly mixing the EPS light soil slurry with the slurry spraying hole and the soft soil layer in the pressure relief hole; 4. and (4) grouting and correcting, namely injecting EPS light soil slurry into the correction hole through the high-pressure rotary spraying device to finish the grouting and correcting process. The construction method for correcting the deviation and reducing the settlement of the building by using the EPS light soil fully utilizes the advantages of the EPS light soil, such as small density, high strength, field manufacture and the like, combines the grouting jacking principle to combine jacking construction and filling construction into a whole, simplifies the construction steps, shortens the construction period, reduces the cost and scientifically realizes the deviation correction and the settlement reduction of the building structure.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a construction method for correcting deviation and reducing settlement of a building by using EPS light soil.
Background
Houses built on weak underlying layers often have overall settlement and inclination due to reasons such as uneven distribution of foundation soil, environmental influence, errors in exploration and design, overlarge eccentricity of the bases of the houses and the like. The method for correcting the deviation of the house in the engineering generally comprises two steps: correcting the deviation and then reinforcing. From the analysis of economic benefits, the deviation rectification underpinning performed in two steps is generally long in construction period and high in cost. The soil body compaction grouting has two effects of reinforcement and lifting, so that the deviation rectifying support of general engineering is combined into one step, the construction steps can be simplified, the construction period can be shortened, but a perfect, reasonable and economic house grouting deviation rectifying method does not exist at present.
Disclosure of Invention
In order to solve the problems, the invention provides a construction method for rectifying deviation and reducing settlement of a building by using EPS light soil, which fully utilizes the advantages of small density, high strength, field manufacture and the like of the EPS light soil, combines the grouting jacking principle to combine jacking construction and filling construction into a whole, simplifies construction steps, shortens construction period, reduces cost and scientifically realizes rectifying deviation and reducing settlement of a building structure.
In order to achieve the above purpose, the invention adopts a technical scheme that:
a construction method for rectifying deviation and reducing settlement of a building by using EPS light soil comprises the following steps: s10, determining deviation correcting parameters, determining grouting deviation correcting positions and deviation correcting quantities through engineering geological data of the building structure, further determining grouting pressure and grouting quantities required by the deviation correcting quantities, leveling a field, measuring and setting out, and determining positions of a grout sealing wall, an isolation load reducing mechanism, a grout spraying hole and a pressure relief hole; s20, constructing an isolation load-reducing mechanism, drilling holes at the position of a grout-sealing wall by using a mixing pile machine, and manufacturing a cement-soil mixing pile by spraying grout to obtain the grout-sealing wall; drilling holes at a designed position by a drilling machine, and spraying slurry by a high-pressure rotary spraying device to manufacture a slurry sealing layer; s30, constructing a floating support sinking prevention mechanism, namely, drilling the guniting hole and the pressure relief hole in a specified sequence by a drilling machine within the influence range of the bottom of the building foundation, injecting EPS light soil cement into the guniting hole, and uniformly mixing the EPS light soil cement with a soft soil layer in the guniting hole to obtain the floating support sinking prevention mechanism; and S40 grouting deviation correction, selecting the existing grout spraying hole as a deviation correcting hole or re-drilling the deviation correcting hole at the position to be corrected on the basis of construction of the floating support sinking stopping mechanism, and injecting EPS light soil slurry into the deviation correcting hole through the high-pressure rotary spraying device to finish the grouting deviation correcting process.
Further, the step S20 includes the following steps: s21 the drilling machine of the deep mixing pile machine is in place, centered and leveled, pre-mixed and sunk, cement paste is mixed, cement paste spraying and stirring are lifted, pre-mixed and sunk, cement paste spraying and stirring are repeated, the drilling machine of the deep mixing pile machine is shifted, and next circulation operation is carried out until cement-soil piles are mutually occluded to form a closed cement paste sealing wall; and S22 drilling machine takes one' S place, and the centering is leveled, and drilling is bored one with the drilling machine whitewashing hole and one the relief pressure hole is to design elevation, transfers high pressure jet grouting device to design elevation, to high pressure injection stirring grout in the design degree of depth, stops the whitewashing, promotes high pressure jet grouting device, and temporary hole sealing, the rig aversion adopts the quincunx type to punch and carries out next cycle operation, and it is more even to form the one deck up to building basis bottom surface certain degree of depth department the grout blanket.
Further, the high-pressure spraying and stirring device comprises: the high-pressure rotary spraying device adopts a double-pipe spraying flow, and the double-pipe spraying flow comprises a high-pressure EPS light soil slurry spraying flow and a compressed air spraying flow; and the EPS light soil slurry production device is connected with the high-pressure rotary spraying device through a slurry conveying pipe.
Further, the step S30 includes the following steps: s31, secondary punching, namely, drilling a group of floating support counterbores to a designed elevation by using a drilling machine; s32, placing a high-pressure rotary spraying device, placing the high-pressure rotary spraying device in the grout spraying hole to a designed elevation, configuring the required EPS light soil slurry concentration, respectively setting the conveying pressure of two pipes in a double pipe, the rotating speed and the lifting speed of the high-pressure rotary spraying device, and setting a mud suction pipe in the grout spraying hole; s33, spraying slurry, starting the high-pressure spraying device, observing the slurry return condition of the mud suction pipe in the slurry spraying hole, starting to lift the high-pressure rotary spraying device and simultaneously lift the mud suction pipe after the slurry return is normal, repeating the steps until the slurry injection in all designed depths is finished, stopping the high-pressure spraying and stirring device, and sealing the hole; and S34, moving the drilling machine and the high-pressure spraying and stirring device to the hole sites of the next group of the guniting holes and the pressure relief holes, and repeating the steps S31-S33 until the construction of the floating and sinking stopping mechanism is finished.
Furthermore, the construction sequence of the floating support sinking prevention mechanism is that the construction is carried out by moving from the edge hole position to the central hole position one by one.
Furthermore, the floating support counterbore of one group comprises three guniting holes and one pressure relief hole, and the three guniting holes and the pressure relief hole are arranged in a quincunx shape.
Further, the EPS light soil is formed by mixing EPS particles, cement, dry soil and water in proportion, the mass percentages of the EPS particles, the cement, the water and the dry soil are respectively 2% -6%, 4% -15% and 60% -80%, and the density of the prepared EPS light soil is 8-16g/cm3The unconfined compressive strength is 50-500kPa, and the EPS light soil slurry is formed by mixing the EPS light soil with water under the condition of combining with a field soil layer.
Further, the distance between the grout sealing wall and the edge of the building structure is not less than 2 m.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) according to the construction method for rectifying and reducing the deviation and the settlement of the building by utilizing the EPS light soil, the isolation load reduction mechanism, the floating support settlement-stopping mechanism and the grouting deviation rectification are arranged at the bottom of the building structure, so that the engineering problems of integral settlement or inclination and the like of the building structure with a weak underlying layer caused by uneven distribution of foundation soil, environmental influence, error in exploration and design, overlarge eccentricity of the foundation and the like can be solved; the invention fully utilizes the advantages of small density, high strength, field manufacture and the like of the EPS light soil, combines the grouting jacking principle to combine jacking construction and filling construction into a whole, simplifies the construction steps, shortens the construction period, reduces the cost and scientifically realizes the deviation rectification and settlement reduction of the building structure.
(2) The invention relates to a construction method for rectifying deviation and reducing settlement of a building by utilizing EPS light soil, which is characterized in that the EPS light soil is formed by mixing EPS foam particles or fragments and raw materials with water through curing agents such as cement and the like, and then curing the mixture to form light EPS light soil with the strength and rigidity meeting the requirements below a building foundation: on one hand, the compressibility of the EPS light soil is much smaller than that of the in-situ soil body, namely, the compressibility of the soil body is reduced; on the other hand, the EPS light soil has lower density than water, has a floating effect on an upper building structure under the action of underground water, can eliminate additional stress of a high-compression soil layer at the lower part, fundamentally stops settlement development and avoids the problem of long-term creep deformation of soft soil. The jacking force of grouting can be effectively increased, so that the building structure is lifted.
(3) According to the construction method for rectifying deviation and reducing settlement of the building by using the EPS light soil, the floating support and settlement stopping mechanism is arranged around the building foundation, and the additional stress of the upper load of the building foundation on the soft lower layer at the bottom of the foundation is reduced by using the compensatory floating support force generated by the low density of the EPS light soil, so that the building settlement is reduced.
(4) According to the construction method for rectifying deviation and reducing settlement of the building by using the EPS light soil, the isolation load reducing mechanism is arranged on the outer side of the building foundation, and the grouting wall is used for forming the plugging cavity so as to be beneficial to grouting rectification by using a grouting jacking principle and isolating the influence of peripheral environment load on the settlement of the building foundation.
Drawings
The technical solution and the advantages of the present invention will be apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 is a flow chart of a construction method for correcting deviation and reducing settlement of a building by using EPS light soil according to an embodiment of the present invention;
FIG. 2 is a schematic view of the isolation load shedding mechanism according to an embodiment of the present invention;
FIG. 3 is a sequence diagram of construction hole sites of the isolation load shedding mechanism according to an embodiment of the present invention;
FIG. 4 is a schematic view of a floating and sinking prevention mechanism according to an embodiment of the present invention;
FIG. 5 is a sequence diagram of construction holes of a floating and sinking prevention mechanism according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a deviation rectifying structure according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a force analysis of the principles of float-over and sink-stop according to an embodiment of the present invention;
FIG. 8 is a diagram of an isolation load shedding numerical simulation analysis model according to an embodiment of the present invention;
fig. 9 is a schematic diagram illustrating the influence of the isolation load relief mechanism on the additional stress field according to an embodiment of the invention.
Reference numerals in the figures
1-grout sealing wall, 2-grout sealing layer, 3-high pressure rotary spraying device, 4-EPS light soil grout production device, 5-grout spraying holes, 5(1) - (5) (30) for isolating relief mechanism construction hole site sequence, 6-pressure relief holes, 7-building foundation, 8-a group of grout spraying holes and pressure relief holes, 8(1) - (8) (2) for floating and sinking stopping mechanism hole site construction sequence and 9-deviation rectifying structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this embodiment, a construction method for performing deviation rectification and settlement reduction on a building by using EPS lightweight soil is provided, as shown in fig. 1 to 6, including the following steps: s10, determining deviation correcting parameters, determining grouting deviation correcting position and deviation correcting amount according to engineering geological data of the building structure, further determining grouting pressure and grouting amount required by the deviation correcting amount, leveling the site, measuring and setting out, and determining the positions of the grout sealing wall 1, the isolation load shedding mechanism, the grout spraying hole 5 and the pressure relief hole 6. S20, constructing an isolation load-reducing mechanism, drilling a hole in the position of the grout-sealing wall 1 by a mixing pile machine, and manufacturing a cement-soil mixing pile by spraying grout to obtain the grout-sealing wall 1; and drilling holes at the designed position by a drilling machine, and spraying slurry by a high-pressure rotary spraying device 3 to manufacture a slurry sealing layer 2. S30, constructing a floating support sinking prevention mechanism, namely, drilling the grout spraying holes 5 in the influence range of the bottom of the building foundation 7 according to a specified sequence by a drilling machine, injecting EPS light soil cement into the grout spraying holes 5, and uniformly mixing the EPS light soil cement with the soft soil layer in the grout spraying holes 5 to obtain the floating support sinking prevention mechanism. And S40 grouting deviation correction, selecting the existing grout spraying hole 5 as a deviation correcting hole or re-drilling the deviation correcting hole at the position to be corrected on the construction foundation 7 of the floating support sinking stopping mechanism, and injecting EPS light soil slurry into the deviation correcting hole through the high-pressure rotary spraying device 3 to finish the grouting deviation correcting process.
The EPS particle mixed light soil is modified soil formed by mixing EPS foam particles or fragments and raw materials with water through curing agents such as cement and the like, fully and uniformly mixing and then performing curing action. The EPS particle mixed light soil has the characteristics of small self weight, high strength, low compressibility, low engineering cost and the like. The application of the soft soil subgrade in the highway can effectively reduce the dead weight of the embankment and improve the stability of the embankment, thereby achieving the purpose of reducing the settlement of the soft soil subgrade and having very wide application prospect.
Step S10, determining the grouting deviation rectifying position and deviation rectifying amount according to the soil layer information and the building structure information; and determining the position and thickness of the soft soil layer to be replaced according to the whole load of the building structure and the information of the lower lying soft soil layer, and finally determining the grouting pressure and the grouting amount required for achieving the deviation correction amount.
The step S20 includes the following steps: s21 the drilling machine of the deep mixing pile machine is in place, centered and leveled, pre-mixed and sunk, cement paste is mixed, cement paste spraying and stirring are lifted, pre-mixed and sunk, cement paste spraying and stirring are repeated, the drilling machine of the deep mixing pile machine is shifted, and next circulation operation is carried out until cement-soil piles are mutually occluded to form a closed cement paste sealing wall 1; the distance between the grout sealing wall 1 and the edge of the building structure is not less than 2m, and the grout sealing wall is used for forming a plugging cavity so as to be beneficial to grouting deviation correction by using a grouting jacking principle and isolating the influence of peripheral environment load on building foundation settlement. The isolation and load shedding mechanism is simplified by one wall with two purposes. S22 drilling machine is taken one' S place, and the centering is leveled, and drilling is bored one with the drilling machine whitewashing hole 5 and one the relief pressure hole 6 is to the design elevation, transfers high pressure jet grouting device 3 to the design elevation, to high-pressure injection stirring grout in the design degree of depth, stops the whitewashing, promotes high pressure jet grouting device 3, and the hole sealing is temporary, and the rig aversion adopts the quincunx type to punch and carries out next circulation operation, and it is more even to form the one deck up to the certain degree of depth department in building basis 7 bottom surface grout layer 2. The isolation damping mechanism is arranged at the boundary of the building and the peripheral stress difference, and the influence of the peripheral stress difference on the building is prevented. The isolation load-shedding mechanism is a separation wall, and the separation wall is the grout sealing wall 1 at the boundary between the building and the peripheral stress difference. The construction sequence of the guniting holes of the sealing layer in the isolation load shedding mechanism is shown in fig. 3, and construction is carried out according to the construction sequence of 5(1) -5 (30).
The high-pressure jet-stirring device 3 is composed of a high-pressure jet-stirring device and an EPS light soil slurry production device, and the high-pressure jet-stirring device 3 is connected with the EPS light soil slurry production device through a pipeline. The high-pressure rotary spraying device 3 adopts a double-pipe spraying jet which comprises a high-pressure EPS light soil slurry spraying jet and a compressed air spraying jet. And the high-pressure EPS light soil slurry jet flow and the compressed air jet flow are horizontally and regularly sprayed. The EPS light soil slurry production device 4 is connected with the high-pressure rotary spraying device 3 through a slurry conveying pipe.
The step S30 includes the following steps: s31, drilling a hole again, and drilling a group of floating support counterbores to the designed elevation by using a drilling machine. S32 places high-pressure rotary spraying device 3 transfer high-pressure rotary spraying device 3 to the design elevation in whitewashing hole 5, dispose required EPS light soil slurry concentration, set up the delivery pressure of two pipes in the dual pipe, high-pressure rotary spraying device 3' S rotation rate and hoisting speed respectively set up the mud suction pipe in whitewashing hole 5. And S33, spraying slurry, starting the high-pressure spraying device, observing the slurry return condition of the mud suction pipe in the slurry spraying hole 5, starting to lift the high-pressure rotary spraying device 3 and simultaneously lift the mud suction pipe after the slurry return is normal, repeating the steps until the slurry injection in all designed depths is finished, stopping the high-pressure spraying and stirring device, and sealing the hole. And S34, moving the drilling machine and the high-pressure spraying and stirring device to the hole sites of the next group of the guniting holes 5 and the pressure relief holes 6, and repeating the steps S31-S33 until the construction of the floating-supporting anti-sinking mechanism is finished.
As shown in FIG. 5, the construction sequence of the floating-supporting anti-sinking mechanism is that the construction is carried out by moving the edge hole sites one by one to the center hole site. The floating support counterbore group comprises three guniting holes 5 and a pressure relief hole 6, and the three guniting holes 5 and the pressure relief hole 6 are arranged in a quincunx shape. The floating support sinking-stopping mechanism utilizes a high-pressure spraying and stirring device to spray and stir EPS light soil slurry in a soft soil layer at the bottom of a building foundation 7 at high pressure so as to mix into EPS light soil. The EPS light soil is formed by mixing EPS foam particles or fragments and raw materials with water through curing agents such as cement and the like, fully and uniformly mixing, and then performing curing action. Forming light EPS light soil with strength and rigidity meeting requirements below the building foundation 7: on one hand, the compressibility of the EPS light soil is much smaller than that of the in-situ soil body, namely, the compressibility of the soil body is reduced; on the other hand, the EPS light soil has lower density than water, has a floating effect on an upper building structure under the action of underground water, can eliminate additional stress of a high-compression soil layer at the lower part, fundamentally stops settlement development and avoids the problem of long-term creep deformation of soft soil. The jacking force of grouting can be effectively increased, so that the building structure is lifted. The floating support sinking-stopping mechanism is characterized in that EPS light soil and an in-situ weak soil body below the building foundation 7 are mixed by using a high-pressure spraying and stirring device, and a whole light block with light weight and strength and rigidity meeting requirements is formed below the building foundation 7. On the one hand, the compressibility of the light block material is much smaller than that of the in-situ soil body, namely, the compressibility of the soil body is reduced. On the other hand, the block body has lower density than water, has a floatage effect on the upper building foundation under the action of underground water, can eliminate the additional stress of a high-compression soil layer at the lower part, fundamentally stops the sedimentation development, and avoids the problem of long-term creep deformation of soft soil. The jacking force of the grouting can be effectively increased, so that the building can be lifted.
The EPS light soil is prepared by mixing EPS particles, cement, dry soil and water in proportion, wherein the mass percentages of the EPS particles, the cement, the water and the dry soil are respectively 2-6%, 4-15% and 60-80%, and the prepared EPS light soil has the density of 8-16g/cm3The unconfined compressive strength is 50-500kPa, and the EPS light soil slurry is formed by mixing the EPS light soil with water under the condition of combining with a field soil layer.
The deviation rectifying mechanism 9 is positioned between the top surface of the EPS light soil and the bottom surface of the building foundation 7 and is arranged at a position to be rectified at the bottom of the building foundation. The building foundation 7 is lifted through the EPS light soil injected at the position to be corrected. The problem of building foundation eccentricity is solved. The invention adopts high-pressure grouting to lift the elevation of the building, realizes deviation rectification, combines the traditional deviation rectification support into one step, can simplify the construction steps and shorten the construction period. The deviation rectifying mechanism 9 is positioned between the EPS light soil and the building foundation 7 and is arranged at a position to be rectified of the building. The EPS light soil with different heights is arranged at different positions to realize the differential lifting of the building foundation 7. The problem of building foundation 7 eccentricity is solved. Different grouting pressures are applied to different positions to realize differential lifting, so that the building is rectified.
The construction method of the invention is described below by taking the correction and sinking reduction of the house as an example: the size of the house foundation is 20m multiplied by 10m, the length of the house foundation in the north-south direction is 20m, and the width of the house foundation in the east-west direction is 10 m. The information of the soil layers below the foundation bottom is shown in table 1. The settlement of the north side of the foundation is 34cm, the average settlement of the foundation is 11.2cm, and the inclination of the house exceeds the standard. 11m thick peat soil and 10m thick clay are buried in the field, and both belong to high-compressibility soft soil; and backfilling 1.8m of filling soil in the field road area, and considering that the large-area stacking load is 36kPa and the house load is 20 kPa.
TABLE 1 soil layer information
And (3) analyzing a scheme: as the compressibility of the peat soil and the following clay layers (hereinafter collectively referred to as lower lying soft soil layers) is very high, the permeability coefficient is extremely low, the settlement is large and the development is slow, and therefore, the additional stress is firstly reduced; because the house foundation is close to the road backfill area, the backfill load causes great additional stress below the house, and the road backfill load is isolated and prevented from being transmitted below the house; in addition, the lower lying soft soil layer has strong rheological property, and if the traditional underpinning scheme is adopted, large creep settlement can be generated under the action of basic underpinning load. Based on the three aspects, the embodiment adopts three measures of isolation load shedding, floating support sinking stopping and grouting deviation rectifying. The detailed description is as follows:
s10, determining deviation correction parameters, and determining grouting deviation correction along the north-south direction on the north side of the house according to the engineering geological data of the building structure; the estimated jacking amount is 5-23 cm, and the grouting pressure is 25-30 MPa by in-situ test measurement on site; and (4) leveling the field, measuring and setting out, and determining the positions of the grout sealing wall 1, the isolation load shedding mechanism, the grout spraying hole 5 and the pressure relief hole 6. And laying a settlement observation point every 4m on the periphery of the house.
S21, positioning a drilling machine of the three-axis deep mixing pile machine, aligning and leveling, pre-mixing and sinking, mixing cement paste, lifting, spraying and stirring, repeating the pre-mixing and sinking, lifting, spraying and stirring, shifting the drilling machine, and performing the next circulation operation until cement-soil piles are mutually occluded with the sealed grout sealing wall 1; the grout sealing wall 1 is composed of cement soil mixing piles which are connected end to end around the periphery of a house foundation, the pile diameter is 850mm, the pile spacing is 600mm, and the pile length is 18 m. The position of the grout sealing wall 1 is 3m away from the edge of the house foundation.
S22, placing a drilling machine in place, performing centering and leveling, drilling one of a guniting hole 5 and one of a pressure relief hole 6 to a designed elevation minus 16.0m (a leveling ground elevation is 0.0m), lowering a high-pressure rotary spraying device 3 to the designed elevation minus 15.5m, spraying and stirring cement paste at a high pressure in the designed elevation minus 15.5 to minus 14.5m, stopping guniting after observing that returned paste is normal, lifting the high-pressure rotary spraying device 3, temporarily sealing holes, shifting the drilling machine, performing next circulation operation in an outward-inward direction by adopting quincunx type punching until a certain depth of the bottom surface of the building foundation forms a uniform grout sealing layer 2. After 24 hours, the subsequent operation was carried out.
S31, secondary punching is carried out, and a group of floating support counterbores are drilled by a drilling machine until the designed elevation reaches-14.0 m; and stopping drilling when the shotcrete hole 5 is drilled to 0.5-1.0 m below the designed elevation, and completely replacing residues in the hole before hole sealing.
S32, lowering the high-pressure rotary spraying device 3 in the guniting hole 5 to the designed elevation of-14.0 m, configuring the required EPS light soil slurry concentration, wherein the guniting pressure is 25-30 MPa, the rotating speed of the rotary spraying device is 18-22 r/min, and the lifting speed is 14-20 cm/min, and ensuring the influence range of guniting and stirring;
s33, spraying slurry, starting a high-pressure spraying and stirring device, observing the slurry return condition of a mud suction pipe in the slurry spraying hole 5, starting to lift the high-pressure rotary spraying device 3 and simultaneously lift the mud suction pipe after the slurry return is normal, repeating the steps until the slurry injection in all designed depths is finished, stopping the high-pressure spraying and stirring device, and sealing the hole; and
s34, moving the drilling machine and the high-pressure spraying and stirring device to the hole sites of the next group of the guniting holes 5 and the pressure relief holes 6, and repeating the steps S31-S33 until the construction of the floating and sinking stopping mechanism is finished.
After the construction of the floating support sinking stopping mechanism is finished, the soft soil layer below 2m of the bottom surface of the house foundation is uniformly mixed with the EPS light soil, the density of the EPS light soil after one week is about 8.5g/cm3, and the unconfined compressive strength is 240 kPa.
And S40 grouting deviation correction, namely, taking the existing grouting hole 5 on the north side of the house as a grouting deviation correction grouting hole 5, drilling to a position 1-1.5 m below a bottom plate of the house, stopping drilling, lowering a high-pressure rotary spraying device 3 to a position 1.0m below the elevation of the bottom plate, starting a high-pressure spraying and stirring EPS light soil device to perform grouting, wherein the grouting pressure is 25-40 MPa, the rotating speed of the rotary spraying device is 10-25 r/min, and the lifting speed is 14-20 cm/min. And monitoring the settlement condition of the periphery of the house at any moment, stopping grouting immediately when the settlement is abnormal, and adjusting the grouting position after finding out reasons to continue working to finish the deviation rectifying process.
As shown in fig. 7, for the stress analysis, in order to eliminate the additional stress at the interface between the EPS light soil and the lower lying soft soil layer caused by the engineering construction, the volume and the mass of the EPS light soil satisfy the following relationship:
Gsoil 1+GSoil 2≥FHouse+FRoad surface+GSoil 1+GLight soil-FFloating body
In the formula GSoil 1、GSoil 2The weight of the upper soil body of the soft soil layer before construction and the weight of the soft soil layer in the treatment range (the weight of the soil body below underground water is the floating weight, the same below); fHouseFor house loading, FRoad surfaceVertical load transmitted for the backfill of adjacent roads, GSoil 1For working up the weight of the soil layer above the compacted soft soil layer, GLight soilIs the dead weight of EPS light soil FFloating bodyIs the buoyancy force borne by the EPS light soil.
As shown in fig. 8, the isolation and load shedding effects of the grout-sealing wall 1 are analyzed by numerical simulation (the floatage effect of the EPS lightweight soil material is not considered in the simulation). The range of the numerical model is horizontally wide by 40m, vertically deep by 30m and vertically 1 linear meter in plane thickness; the bottom surface and the left and right side surfaces apply the additive phase shift constraint, and no displacement is caused in the plane direction. Using elastic analysis, compression modulus Es1-2The poisson's ratio is 0.2 as the elastic modulus. The top is applied with loads of 36kPa and 20kPa which are evenly distributed to simulate the effects of backfill and house loads respectively.
Referring to fig. 9, first of all, balancing under a gravity field, followed by applying 45.5% of the top distribution load (corresponding to the current field consolidation), thus forming an effective stress field corresponding to the current field situation. The remaining 54.5% of the load on the top was then applied, both without and with the dividing wall in mind. The wallpaper, which gives the additional vertical stress in the field resulting from the application of this remaining 54.5% load, is distributed in the model space with the vertical stress that has previously developed. It can be seen that the grout sealing wall 1 effectively limits the additional stress distribution range of the soil body below the building, which shows that the isolation and load shedding effects are effective.
The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are transformed by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A construction method for rectifying deviation and reducing settlement of a building by using EPS light soil is characterized by comprising the following steps:
s10, determining deviation correcting parameters, determining grouting deviation correcting positions and deviation correcting quantities through engineering geological data of the building structure, further determining grouting pressure and grouting quantities required by the deviation correcting quantities, leveling a field, measuring and setting out, and determining positions of a grout sealing wall, an isolation load reducing mechanism, a grout spraying hole and a pressure relief hole;
s20, constructing an isolation load-reducing mechanism, drilling holes at the position of the grout-sealing wall by using a mixing pile machine, and manufacturing a cement-soil mixing pile by spraying grout to obtain the grout-sealing wall; drilling holes at a designed position by a drilling machine, and spraying slurry by a high-pressure rotary spraying device to manufacture a slurry sealing layer;
s30, constructing a floating support sinking prevention mechanism, namely drilling the guniting hole and the pressure relief hole in a specified sequence by a drilling machine within the influence range of the bottom of a building foundation, injecting EPS light soil cement into the guniting hole, and uniformly mixing the EPS light soil cement with a soft soil layer in the guniting hole to obtain the floating support sinking prevention mechanism; and
s40, grouting and correcting, selecting the existing grout spraying hole as a deviation correcting hole or re-drilling the deviation correcting hole at the position to be corrected on the basis of construction of the floating support sinking stopping mechanism, and injecting EPS light soil grout into the deviation correcting hole through the high-pressure rotary spraying device to finish the grouting and correcting process.
2. The construction method for rectifying deviation and reducing sinking of a building by using EPS light soil as claimed in claim 1, wherein the step S20 comprises the steps of:
s21, positioning a drilling machine of the deep mixing pile machine, aligning and leveling, pre-mixing and sinking, stirring cement paste, lifting and spraying, stirring, repeating the pre-mixing and sinking, lifting and spraying stirring, shifting the drilling machine of the deep mixing pile machine, and performing the next circulation operation until cement-soil piles are mutually occluded to form a closed slurry sealing wall; and
s22, drilling machine take one' S place, the centering levelling, drill hole, drill one with the drilling machine whitewashing hole and one the relief pressure hole is to design elevation, transfers high pressure jet grouting device to design elevation, to high pressure injection stirring grout in the design degree of depth, stops the whitewashing, promotes high pressure jet grouting device, and temporary hole sealing, the rig aversion adopts the quincunx type to punch and carries out next cycle operation, and it is more even to form the one deck up to the certain degree of depth department of building basis bottom surface the grout blanket.
3. The construction method for rectifying deviation and reducing settlement of a building by using EPS (expandable polystyrene) light soil as claimed in claim 2, wherein the high-pressure spraying and stirring device comprises:
the high-pressure rotary spraying device adopts a double-pipe spraying flow, and the double-pipe spraying flow comprises a high-pressure EPS light soil slurry spraying flow and a compressed air spraying flow; and
the EPS light soil slurry production device is connected with the high-pressure rotary spraying device through a slurry conveying pipe.
4. The construction method for rectifying deviation and reducing sinking of a building by using EPS light soil as claimed in claim 1, wherein the step S30 comprises the steps of:
s31, re-drilling, and drilling a group of floating support counterbores to a designed elevation by using a drilling machine;
s32, placing a high-pressure rotary spraying device, placing the high-pressure rotary spraying device in the grout spraying hole to a designed elevation, configuring the required EPS light soil slurry concentration, respectively setting the conveying pressure of two pipes in a double pipe, the rotating speed and the lifting speed of the high-pressure rotary spraying device, and setting a mud suction pipe in the grout spraying hole;
s33, spraying slurry, starting the high-pressure spraying device, observing the slurry return condition of the mud suction pipe in the slurry spraying hole, starting to lift the high-pressure rotary spraying device and lift the mud suction pipe after the slurry return is normal, repeating the steps until the slurry injection in all designed depths is finished, stopping the high-pressure spraying and stirring device, and sealing the hole; and
s34, moving the drilling machine and the high-pressure spraying and stirring device to hole positions of the next group of the guniting holes and the pressure relief holes, and repeating the steps S31-S33 until the construction of the floating and sinking stopping mechanism is finished.
5. The construction method for rectifying deviation and reducing sinking of a building by using EPS light soil as claimed in claim 4, wherein the construction sequence of the floating support sinking prevention mechanism is that the construction is carried out by moving from the edge hole site to the center hole site one by one.
6. The construction method for rectifying deviation and reducing sinking of a building by using EPS light soil as claimed in claim 4, wherein a set of floating support counterbores comprises three grout spraying holes and one pressure relief hole, and the three grout spraying holes and the one pressure relief hole are arranged in a quincunx shape.
7. The construction method for rectifying deviation and reducing sinking of the building by using the EPS light soil as claimed in claim 1, wherein the EPS light soil is prepared by mixing EPS particles, cement, dry soil and water in proportion, the mass percentages of the EPS particles, the cement, the water and the dry soil are respectively 2% -6%, 4% -15% and 60% -80%, and the density of the prepared EPS light soil is 8-16g/cm3The unconfined compressive strength is 50-500kPa, and the EPS light soil slurry is formed by mixing the EPS light soil with water under the condition of combining with a field soil layer.
8. The construction method for rectifying deviation and reducing sinking of the building by using the EPS light soil as claimed in claim 1, wherein the distance between the grout-sealing wall and the edge of the building structure is not less than 2 m.
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