CN114277762B - Foundation treatment method for foundation vibration control of power machine - Google Patents
Foundation treatment method for foundation vibration control of power machine Download PDFInfo
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a foundation treatment method for foundation vibration control of a power machine, which comprises the steps of firstly, through simulating foundation dynamic characteristic test, setting up foundation treatment schemes of rolling cement soil replacement and tamping pile edge locking, designing foundation treatment parameters, then carrying out construction process tests such as material preparation, indoor compaction test, field rolling test and the like, simultaneously carrying out replacement preparation work, mixing and transportation of cement soil, layered paving, rolling and quality inspection until reaching the total design thickness of a replacement area, carrying out maintenance, and finally adopting tamping pile edge locking along one week of the edge of the replacement area. The invention improves the soil performance by means of cement, reduces the deformation of the foundation, improves the bearing capacity of the foundation, effectively controls the foundation settlement, ensures the safe operation of the power machine, and has simple and easy construction, high efficiency and rapidness, strong quality controllability and remarkable economic benefit.
Description
Technical Field
The invention belongs to the technical field of foundation construction of constructional engineering, and particularly relates to a foundation treatment method for controlling foundation vibration of a power machine.
Background
With the rapid development of industrial technology, machine equipment is continuously updated, and large-tonnage, high-rotation-speed and high-power machines, such as high-capacity or ultrahigh-pressure compressors, high-rotation-speed turbines, high-precision instruments and meters, precision machine tools and the like are increasingly popular. Any power machine needs to have a stable foundation and a safe and reliable foundation to support. When the foundation design of the power machine equipment is carried out, the vibration of the foundation needs to be controlled within the allowable range.
When a large-scale power machine normally operates, unbalanced disturbance force generated by the action of power load causes the machine to vibrate, so that the foundation vibrates, and a large part of energy is transmitted into the foundation, so that the movement of the surface of the foundation is caused, the foundation is deformed, and the bearing capacity of the foundation is reduced, and even additional settlement is added. The deformation of the foundation is conducted to the upper power machine to respond, the foundation and the upper power machine form a complex vibration system, and the damping and self-vibration periods of the whole structure are finally acted, so that the normal operation of the machine is influenced, machine parts are easy to wear, the operation conditions of workers are deteriorated, and the physical and psychological health and the working efficiency of the workers are influenced. Meanwhile, excessive vibration is transmitted to nearby houses through the foundation, so that normal work and life of people are disturbed, and a precision machine tool and instruments cannot be used normally.
Theoretical research and experiments show that the influence factors of the basic vibration of the power machine are mainly the dynamic characteristics of the basic vibration and the dynamic characteristics of the foundation, and are also related to the structural form and the size of the machine foundation. The basis weight is not the only factor controlling the vibrations, and the basis area and the depth of burial and the dynamic characteristics of the foundation also have a significant impact on the vibrations. Therefore, the dynamic response processing of the foundation of the power machine foundation is an important content for controlling the vibration of the power machine foundation, and has very important practical significance.
Disclosure of Invention
The present invention aims to provide a foundation treatment method for controlling the foundation vibration of a power machine in response to the above technical needs.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the foundation treatment method for the foundation vibration control of the power machine is characterized by comprising the following steps of: the method comprises the following steps:
s1) a foundation treatment scheme is planned, and foundation treatment parameters are designed:
combining the running frequency characteristic of the power machine and the displacement characteristic of the foundation of the power machine, and developing a foundation treatment scheme for rolling cement soil replacement and tamping pile lockstitch by simulating foundation dynamic characteristic test, and designing a replacement filler, a mixing ratio, a total foundation treatment thickness T, a compaction coefficient k and an optimal water content WOP of foundation treatment;
s2) material preparation and construction process test:
cement soil is selected as a filling material, and cement in the cement soil adopts bulk compositeSilicate cement is taken, qualified soil materials are taken, cement is added according to the mixing ratio designed by foundation treatment after screening, cement is mechanically mixed uniformly, a compaction test is carried out by adopting an electric compaction instrument, a water content-dry density compaction curve of the cement soil is drawn, the optimal water content WOP and the corresponding maximum dry density rho of the cement soil are analyzed and determined, an on-site rolling construction process test is carried out according to the parameters obtained by the indoor compaction test, and construction control parameters are further verified and determined: rolling machine and spreading thickness t 0 Number of rolling passes, compacting machine, thickness t of rolling forming 1 Compaction coefficient k, optimal water content WOP, maximum dry density ρ;
s3) replacement and filling preparation work;
the foundation pit excavation of the on-site foundation treatment filling area is carried out while the material preparation and construction process tests are carried out, the underground water level is firstly reduced to 500mm below the elevation of the bottom surface of the foundation pit of the filling area before filling, no ponding exists in the foundation pit, the bottom surface of the foundation pit of the filling area is subjected to leveling treatment, all weak interlayers, silt, floating soil and sundries are thoroughly removed, the water content is proper through water airing or airing, the on-site groove inspection is carried out, and the elevation of the bottom surface of the foundation pit of the filling area is retested;
s4) mixing and transporting cement soil:
according to the soil mass amount of the filling area, cement is added into the soil material in batches to be mixed to form cement soil;
s5) cement soil paving and rolling:
filling in the direction of a foundation pit by adopting a space-filling method, paving cement soil by using a loader and a bulldozer, leveling by using a land leveler and a frog rammer, immediately starting rolling by adopting a low-frequency high-amplitude vibration road roller and a bump vibration roller, and fully rolling by adopting a forward and backward full-vibration offset method from outside to inside in a parallel axis direction;
s6) quality inspection:
measuring settlement by using a leveling instrument by adopting a square grid method, and checking the thickness t of the rolling forming 1 If the design requirement is met, the excess or insufficient part is manually adjusted, and the soil cement is dried by a ring cutter methodDetecting density, wherein the sampling depth of the cutting ring is rolling forming thickness t 1 1/3 of the total weight of the cement soil, calculating average dry density according to a plurality of measurement points, comparing the average dry density with the maximum dry density rho corresponding to the optimal water content WOP, determining whether the compaction coefficient k meets the designed foundation treatment requirement, and continuously rolling until the compaction coefficient does not meet the designed foundation treatment requirement, and tracking and detecting the water content of the cement soil by adopting an alcohol burning loss method and an oven method on site until the compaction coefficient reaches the requirement;
s7) repeating the construction of the upper layer of cement soil:
after a layer of cement soil is paved, rolled and inspected to be qualified in quality, repeating the steps S3, S4 and S5, and carrying out uninterrupted construction on the upper layer of cement soil from bottom to top until the construction of each layer within the total thickness T of foundation treatment is completed;
s8) maintenance of the filling area:
rolling, filling and covering all cement soil in the filling area by geotextile, plastic film or straw bag, and sprinkling and curing for at least 7 days;
s9) ramming pile edge locking construction:
the pile edge is sealed by tamping cement gravel soil along the periphery of the filling area, a pile machine is firstly used for aligning and forming holes to the designed depth, a heavy hammer is used for tamping and then filling cement gravel soil stones into the pile holes, and a region with the depth of 800-1200 mm at the lower part of the pile is continuously tamped and expanded to form an enlarged head of the pile body, so that the continuity and compactness of the pile body are ensured;
s10) evaluating foundation treatment:
after the construction of the rammed pile edge locking of the whole filling area is finished, the bearing capacity tester is used for measuring the bearing capacity and the compressibility of the foundation of the cement soil, and the foundation treatment is evaluated to verify whether the foundation treatment design requirement is met.
According to the scheme, in the step S4), the cement is added into the soil material and mixed by adopting a road mixing method and grid paving construction, or a plant mixing method is adopted in the foundation treatment construction of a large-scale power machine foundation, and a mixer is selected to mix the cement soil.
According to the scheme, the water content of the cement soil is checked in time in the mixing process in the step S4), and the water content is controlled to be between-2% and +3% of the WOP.
According to the scheme, in the step S5), the joint of two adjacent sections is cut into a slope shape or a tooth ridge shape, the gradient is not steeper than 1:3, the joint positions are overlapped with each other during rolling, the overlap width is controlled between 0.3 and 0.5m, and the paving and rolling processes of the two adjacent sections are simultaneously carried out.
According to the scheme, the cement soil paving in the step S5) is completed within 2 hours, and the time from the mixing to the rolling compaction of the cement soil is controlled within 4 hours.
According to the scheme, the dry density detection in the step S6) is carried out by adopting a sand filling method or a nuclear densitometer, and then the dry density detection is compared and checked with a ring cutting method.
According to the scheme, the quality inspection in the step S7) is completed within 4 hours after each layer of cement soil is rolled, and the covering of the upper layer of cement soil is completed within 6-8 hours.
The beneficial effects of the invention are as follows: the foundation treatment method for the foundation vibration control of the power machine is provided, the foundation treatment technology of rolling cement soil replacement and ramming pile edge locking is adopted, the problem of foundation vibration control of the power machine is effectively solved, on the premise that the foundation size of the power machine is determined, the performance of soil is improved by means of cement, the deformation of the foundation is reduced, the bearing capacity of the foundation is improved, the foundation settlement is effectively controlled, and the safe operation of the power machine is ensured; the method realizes local material taking of the soil material, saves materials, reduces transportation, can realize continuous and large-scale construction, is simple, convenient, feasible, efficient and quick in construction, low in cost and remarkable in economic benefit; the foundation treatment method provided by the invention has the advantages of high requirements on construction conditions, multiple working procedures and difficult quality control, reasonable technological measures are formulated, the controllability is high, and the construction quality is easy to ensure.
Drawings
FIG. 1 is a flow chart of one embodiment of the present invention.
Fig. 2 is a schematic diagram of layered spreading and rolling of soil cement according to an embodiment of the present invention.
Fig. 3 is a schematic plan view of a compressor foundation, foundation treatment reclamation area, and rammed pile according to a third embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of a compressor foundation, foundation treatment reclamation area, and rammed pile according to a third embodiment of the present invention.
Fig. 5 is an enlarged schematic view of a section of the rammed pile of fig. 4.
Wherein: 1-foundation pit bottom surface, 2-foundation pit slope, 3-cement, 4-cement soil, 5-power machine foundation, 6-filling area, 7-rammed pile, 8-construction channel and 9-cement gravelly soil.
Detailed Description
Embodiments of the present invention will now be described with reference to the accompanying drawings, and the present invention is not limited to the following examples.
The foundation treatment method for foundation vibration control of power machine includes simulating foundation dynamic characteristic test, setting foundation treatment scheme of rolling cement soil to replace and fill pile, designing foundation treatment parameters, preparing material, indoor compaction test, site rolling test, etc. while mixing and transporting cement soil, spreading, rolling and quality inspection until reaching the thickness of the replaced area, maintaining, and final pile locking by using ramming and expanding along the edge of the replaced area.
Example 1
As shown in fig. 1, the foundation treatment method for foundation vibration control of the power machine is specifically implemented by the following steps:
s01, a foundation treatment scheme is planned, and foundation treatment parameters are designed
By combining the running frequency characteristic of the power machine and the displacement characteristic of the power machine foundation 5, a foundation treatment scheme of rolling cement soil replacement and rammed pile edge locking is formulated by developing a simulated foundation dynamic characteristic test, and parameters such as filler replacement, proportion, total foundation treatment thickness T, compaction coefficient k, optimal water content WOP and the like of foundation treatment are designed.
S02, preparing materials and testing construction process
(1) Raw material selection
Cement 4 is selected as the refill material. The soil material in the cement soil 4 is selected from clay or powdery clay, and poor clay materials containing saline soil, expansive soil, frozen soil, organic matters and the like cannot be used. The water content of the soil is strictly controlled according to the foundation treatment design requirement, for example, the soil is excessively wet and needs to be aired, and the soil is excessively dry and needs to be sprayed with water. The soil material must not have turf, and the large block of soil material must be broken and sieved, and its grain size must not exceed 50mm. The cement 3 in the cement soil 4 adopts bulk composite silicate cement, the strength grade is determined according to the foundation treatment design requirement, and the cement is continuously fed according to the same manufacturer, the same grade, the same variety and the same batch number.
(2) Indoor compaction test
And (3) taking qualified soil materials, adding cement 3 according to a mixing ratio designed for foundation treatment after screening, mechanically stirring the soil uniformly to obtain cement 4, performing compaction test by adopting an electric compaction tester, and drawing a compaction curve of the water content corresponding to the dry density. And analyzing the compaction curve of the cement soil 4, and determining the maximum dry density rho corresponding to the optimal water content WOP of the cement soil 4.
(3) In situ roller compaction test
According to the parameters obtained by the indoor compaction test, carrying out a rolling construction process test of the on-site cement soil 4, verifying and determining the virtual thickness t of the rolling machine and the paving material 0 Number of passes of rolling, compacting machine, thickness t of formed after rolling 1 Construction control parameters such as compactness k, optimal water content WOP, maximum dry density rho and the like. Test parameters and working procedures which meet foundation treatment design specifications, are good in quality, fast in progress, economical and reasonable are preferentially selected and used as construction control parameters and quality control technical requirements for replacing and filling the cement 4 in foundation treatment.
S03, replacement and filling preparation work
(1) Earthwork excavation
And (3) carrying out foundation pit excavation of the site foundation treatment filling area 6 while carrying out material preparation and construction process tests. And carrying out contour lofting according to the size of the design drawing, and carrying out slope ratio excavation by adopting machinery. When the foundation pit is excavated to 100-200 mm above the basic soil of the foundation pit bottom surface 1, the foundation pit is manually trimmed, sludge and broken rock on the foundation pit bottom surface 1 are removed, and overexcavation is avoided.
(2) Lowering groundwater level
Before the replacement, the underground water level is firstly reduced to 500mm below the 1 elevation of the bottom surface of the foundation pit in the replacement area 6, so that no ponding exists in the foundation pit.
(3) Cleaning the bottom surface of a foundation pit
And (3) flattening the bottom surface 1 of the foundation pit in the filling area 6 to thoroughly remove all weak interlayers, silt, floating soil and sundries. If the soil quality of the foundation pit bottom surface 1 is generally loose and the water loss is serious, sprinkling water and static grinding is carried out; and if the water content of the foundation pit bottom surface 1 is too high and the foundation pit bottom surface is in a soft plastic state, airing is carried out, and after the water content is proper, the next construction is carried out.
(4) Concealed acceptance check
And (3) checking the groove on site, retesting the elevation of the bottom surface 1 of the foundation pit in the filling area 6, and checking whether the soil on the bottom surface 1 of the foundation pit is uniform or not by using steel bars with the length of 2m for cutting.
S04, mixing and transporting cement soil
And (3) adding the cement 3 into the soil material in batches according to the mixing amount of the cement 3 calculated by the soil mass of the filling-changing area 6, and stirring to form cement soil 4.
And (5) adopting a road mixing method and performing gridding paving construction. Dividing the soil into square grids according to the calculated mixing amount of the cement 3 after the soil material is paved, dividing the square grids into square grids according to the paving area corresponding to 50kg or 100kg of the cement 3, manually paving and sprinkling the cement 3 in each square grid, and rotationally stirring for 4-6 times by using a rotary cultivator until the soil material is uniformly stirred, has consistent color, has no blank spots, gray strips, gray clusters or flower surfaces and has no soil material interlayer.
In the mixing process, the water content of the cement soil 4 is checked in time, and the water content is controlled to be between-2% and +3% of the WOP. If the humidity of the cement soil 4 is too high, airing; if the humidity of the cement soil 4 is too low, water is supplemented by a water gun spray pipe or a water spraying vehicle.
S05, paving and rolling cement soil
(1) Spreading and leveling cement soil
Filling in the direction of a foundation pit by adopting an occupying method, paving the cement soil 4 by using a loader and a bulldozer, and leveling by using a land leveler and a frog ramming machine. Before spreading the first layer of material, a layer of cement 3 is spread on the bottom surface 1 of the foundation pitThen spreading the virtual material of the cement soil 4, and spreading the virtual thickness t 0 Properly thickening 50-100 mm. Firstly, rough leveling is performed by using a loader and a flat vibrator, and then 3-5 times are performed by using a land leveling machine and a frog rammer according to the sequence of the periphery and the middle. And (5) leveling the corner positions by adopting superfilling and manual matching.
Further, the prepared cement soil 4 is paved and pressed within 2 hours.
(2) Cement soil compaction
Immediately adopting a low-frequency high-amplitude vibratory roller and a bump vibratory roller to start rolling after the cement soil 4 is paved and leveled. The rolling mode is parallel to the axis direction, and the forward and backward full-vibration offset method is used for rolling back and forth comprehensively, and the rolling is performed by adjacent staggered arrangement from the outer side to the inner side. The vibration rolling times of the convex blocks are controlled to be 8-10 times, the static pressure is firstly carried out for 2 times, then the vibration rolling is carried out for 4-6 times, and finally the static pressure is carried out for 2 times until the surface is flat and no obvious indentation exists. The running speed is not more than 2.5km/h when rolling, the rolling is started, the rolling is suitable to run slowly, the rolling track is about 1/2 of the rolling width by adopting a track rolling method, and the rolling track is not less than 200mm. Large construction machines such as bulldozers, excavators and the like cannot turn around, brake or turn around on the rolled cement soil 4 suddenly, so that obvious tracks are prevented from being left.
Further, during the sectional construction, the joint of two adjacent sections should be cut into a slope shape or a tooth shape, the gradient is not steeper than 1:3, the joint positions are mutually overlapped when rolling, the overlap width is controlled between 0.3-0.5 m, and the paving and rolling processes of the two adjacent sections are simultaneously carried out.
Further, a small frog tamper and manual cooperation tamping are adopted near the corner part which cannot be rolled by the vibration roller. When rolling, if the phenomena of spring soil, loose soil, peeling and the like are bad, the cement 3 is timely turned over and excavated, and a proper amount of cement 3 is added for re-mixing or replaced by new cement soil 4. And (3) manually paving fine materials of the cement soil 4 at the rolling wave pits, and continuously rolling until the surface is flat and no obvious indentation exists.
Further, the time from the mixing to the compaction of the soil cement 4 is controlled within 4 hours.
Attention points in construction: in the rolling process, the surface of the cement soil 4 is always kept moist, and if the water evaporates too fast, a small amount of water is timely added.
S06, quality inspection
And immediately measuring the settlement amount, checking the compactness and detecting the water content after the cement soil 4 is paved and rolled.
(1) Settlement measurement
The settlement is measured by a leveling instrument by adopting a square grid method, and the forming thickness t of the spreading material is ensured 1 The design requirement is met. And the exceeding or the shortage part is adjusted by manual cooperation.
(2) Compaction test
The dry density of the cement soil 4 is detected by adopting a ring cutter method, and the sampling depth of the ring cutter is the paving forming thickness t 1 1/3 of the total weight of the foundation, calculating average dry density according to a plurality of measurement points, comparing the average dry density with maximum dry density rho corresponding to the optimal water content WOP, and determining whether the compactness k meets the designed foundation treatment requirement. And when the compactness does not meet the designed foundation treatment requirement, rolling is continued until the compactness meets the requirement.
(3) Water content detection
And (3) carrying out tracking detection on the water content of the cement soil 4 by adopting an alcohol burning loss method and an oven method on site.
S07, repeating the construction of the upper layer of cement soil
And (3) after the one layer of cement soil 4 is paved, rolled and inspected to be qualified in quality, repeating the steps S03, S04 and S05, and carrying out uninterrupted construction on the upper layer of cement soil 4 from bottom to top until the construction on each layer within the total thickness T of foundation treatment is completed. The construction of the cement soil 4 of each layer follows the principle of quick paving, quick leveling, compaction and quick detection.
Further, the joint of the cement soil 4 layers is cut into a slope shape or a tooth ridge shape, the gradient is not steeper than 1:3, the width is controlled within 500-1000 mm, and the joint positions of all layers are staggered by 500-1000 mm. After each layer of cement soil 4 is rolled, the loose cement soil 4 at the joint is removed.
Further, after rolling of each layer of cement soil 4 is completed, quality detection is completed within 4 hours, and covering of the upper layer of cement soil 4 is completed within 6-8 hours.
Attention points in construction: the construction should take particular attention to weather changes. And stopping construction in the continuous low-temperature overcast and rainy weather, and rapidly rolling, covering and covering the paved cement soil 4 to ensure that the water content of the cement soil 4 does not change greatly. When in winter construction, the rolled cement soil 4 is covered with heat preservation measures to prevent freezing; if frozen into blocks, mechanically crushed or temporarily removed, and reused after thawing. When the construction is interrupted due to reasons, new and old joint surfaces are shaved and then the joint is constructed after the construction is restored, the joint is lapped according to a slope shape or a tooth bank shape, the lapping width is not less than 2m, and the joint is reinforced and rolled.
S08, maintenance of the filling area
And (3) rolling, filling and replacing all the cement soil 4 in the filling area 6, adopting geotextile, plastic films or straw bags for heat preservation and covering, and carrying out sprinkling maintenance for not less than 7 days. The water sprinkling frequency per day is determined according to the climate and humidity conditions, the water sprinkling amount and the water sprinkling frequency are properly reduced in rainy days, the water sprinkling amount and the water sprinkling frequency are properly increased in sunny days, and the surface of the cement soil 4 is always kept moist during maintenance.
S09, ramming pile edge-locking construction
And tamping and expanding piles 7 by cement and gravel soil 9 along the periphery of the edge of the filling area 6 for locking. Firstly, a pile machine is used for aligning and forming holes to the designed depth, a heavy hammer is used for tamping, then cement, gravel and soil 9 stones are filled into the pile holes, and a depth area of 800-1200 mm of the lower part of a formed pile is continuously rammed and expanded to form an enlarged head of the pile body, so that the continuity and compactness of the pile body are ensured.
Example two
The difference between this embodiment and the first embodiment is that:
step S04, mixing and transporting cement soil:
in the foundation treatment construction of the large-scale power machine foundation 5, a plant mixing method is adopted, and a mixer is selected to mix the cement soil 4. And (3) stirring the cement soil 4 according to the mixing ratio determined by the foundation treatment design, repeatedly stirring by a stirrer until the color is uniform, and performing EDTA titration detection on the mixing amount of the cement 3 on the cement soil 4.
Further, the number of the stirring at each time is not too large, the size of the stirring field is limited, the thickness is not more than 500mm, and uneven stirring caused by too thick soil is avoided. Meanwhile, the number of mixing at each time is 1.1-1.2 times of the number required by construction of each layer, so that the consolidation of the cement soil 4 caused by excessive mixing and residual stacking is prevented.
Attention points in construction: the prepared cement soil 4 is temporarily covered by industrial felt or plastic film in the transportation process, so that water loss or rain is prevented.
Step S06, the compactness test of the step (2) of the quality test:
dry density detection is carried out by adopting a sand filling method or a nuclear densitometer, and then comparison check is carried out with a ring cutting method.
Step S09, tamping and expanding pile edge locking construction:
after the construction of the locking edge of the rammed pile 7 in the whole filling area 6 is completed, the bearing capacity and the compressibility of the foundation of the cement soil 4 are measured by a bearing capacity tester, and the foundation treatment is evaluated to verify whether the foundation treatment design requirement is met.
The second embodiment is particularly suitable for vibration control of a large, important, high-precision power machine foundation 5.
Example III
A large-scale high-precision compressor of a certain project is designed with basic dimensions of 41035 multiplied by 11400 multiplied by 6100mm (length multiplied by width multiplied by height), basic burial depth of about-6.0 m, working frequency of a compressor motor of 1.6 Hz to 15.7Hz, and differential settlement sensitivity. The foundation is positioned in a soil filling area, foundation treatment is needed for controlling foundation vibration, the rigidity, compactness and bearing capacity of foundation soil are required to be improved, and the compression rigidity, the shear rigidity, the bending rigidity, the torsional rigidity, the compaction coefficient, the foundation bearing capacity, the foundation horizontal resistance and the like of the treated foundation soil are definitely required.
S01, a foundation treatment scheme is planned, and foundation treatment parameters are designed
By combining the running frequency characteristic of a power machine and the displacement characteristic of a power machine foundation 5, a foundation treatment scheme of rolling cement soil replacement and tamping pile locking is formulated by developing a foundation dynamic characteristic test of a simulated foundation, the replacement filler of foundation treatment is cement soil 4, the mixing ratio of cement 3 to soil volume is 2:8, cement 3 adopts P.O 42.5.5 ordinary Portland cement, the total thickness T=2.2 m of the foundation treatment, the compaction coefficient k is more than or equal to 0.95, the water content is controlled to be the optimal water content WOP+/-2%, the foundation treatment range is about 6m of the foundation of the power machine at each side, and the edge of the foundation treatment range adopts cement gravel soil 9 tamping pile 7 locking treatment.
S02, preparing materials and testing construction process
(1) Raw material selection
Cement 4 is selected as the refill material. The soil material in the cement soil 4 is selected from clay or powdery clay, and poor clay materials containing saline soil, expansive soil, frozen soil, organic matters and the like cannot be used, the maximum grain diameter of the soil material after sieving is less than or equal to 15mm, the water content is controlled to be within the optimum water content WOP+/-2%, the organic matter content is less than or equal to 2%, and the soil material is required to be held by hands to form clusters and fall to the ground to form flowers. If the soil is too wet, the soil needs to be dried, and if the soil is too dry, the water needs to be sprayed. Cement 3 in cement soil 4 adopts bulk composite silicate cement, the strength grade is P.O 42.5.42.5, and the cement is continuously fed according to the same manufacturer, the same grade, the same variety and the same batch number.
(2) Indoor compaction test
And (3) taking qualified soil materials, adding cement 3 according to a mixing ratio designed by foundation treatment after screening, mechanically stirring uniformly to form cement soil 4, performing compaction test by adopting an electric compaction device, and drawing a compaction curve of the water content of the cement soil corresponding to the dry density. And analyzing the compaction curve of the cement soil 4, and determining the optimal water content WOP of the cement soil 4 and the maximum dry density rho of the corresponding optimal water content WOP.
(3) In situ roller compaction test
According to the parameters obtained by the indoor compaction test, carrying out an on-site rolling construction process test, verifying and determining construction control parameters, and selecting the test parameters meeting foundation treatment design specifications, good quality, fast progress, economy and rationality as the virtual thickness t of rolling machinery and paving materials 0 About 400mm, the number of the rolling passes is 10, and the thickness t is formed 1 The compaction coefficient k is equal to or larger than 0.95 and is approximately 200mm, the water content is controlled to be the optimal water content WOP+/-2%, and the compaction coefficient k is used as a construction control parameter for replacing and filling the cement 4 in the foundation treatmentNumber and quality control specifications.
S03, replacement and filling preparation work
(1) Earthwork excavation
And (3) carrying out foundation pit excavation of the site foundation treatment filling area 6 while carrying out material preparation and construction process tests. And (3) carrying out contour lofting according to the width of each side of the foundation 5m of the power machine, and excavating by adopting a machine according to the slope ratio of 1:1.5. When the foundation pit is excavated to 100-200 mm above the foundation soil of the foundation pit bottom surface 1 (namely, the elevation of the foundation pit bottom surface 1 is excavated-8.0-8.1 m), the foundation pit bottom surface 1 is manually trimmed, and the sludge and broken rock of the foundation pit bottom surface 1 are removed, so that the over-excavation is avoided.
(2) Lowering groundwater level
Before the replacement, the underground water level is firstly reduced to 500mm below the 1 elevation of the bottom surface of the foundation pit in the replacement area 6, so that no ponding exists in the foundation pit. And a drainage ditch is arranged on the bottom surface 1 of the foundation pit in the filling area 6, the clear water is discharged into a water collecting well according to a gradient of 1%, and the water is discharged by a submersible pump.
(3) Cleaning the bottom surface of a foundation pit
And (3) flattening the bottom surface 1 of the foundation pit in the filling area 6 to thoroughly remove all weak interlayers, silt, floating soil and sundries. If the soil quality of the foundation pit bottom surface 1 is generally loose and the water loss is serious, sprinkling water and static grinding is carried out; and if the water content of the foundation pit bottom surface 1 is too high and the foundation pit bottom surface is in a soft plastic state, airing is carried out, and after the water content is proper, the next construction is carried out.
(4) Concealed acceptance check
And (3) checking the groove on site, retesting the elevation of the bottom surface 1 of the foundation pit in the filling area 6, and checking whether the foundation pit bottom surface 1 is uniform or not by using steel bars with the length of 2m for cutting.
S04, mixing and transporting cement soil
And (3) calculating the doping amount of the cement 3 according to the earthwork amount of the filling area 6, and adding the cement 3 into the soil material in batches to mix so as to form the cement soil 4.
And (3) adopting a plant mixing method, and mixing the cement soil 4 by using a mixer. And (3) stirring the cement soil 4 according to the mixing ratio of the cement 3 to the soil volume of 2:8, repeatedly stirring by a stirrer until the color is uniform, and performing EDTA titration detection on the cement 3 doping amount of the cement soil 4.
Further, the number of the stirring at each time is not too large, the size of the stirring field is limited, the thickness is not more than 500mm, and uneven stirring caused by too thick soil is avoided. Meanwhile, the number of mixing at each time is 1.1-1.2 times of the number required by construction of each layer, so that the consolidation of the cement soil 4 caused by excessive mixing and residual stacking is prevented.
Attention points in construction: the prepared cement soil 4 is temporarily covered by industrial felt or plastic film in the transportation process, so that water loss or rain is prevented.
S05, paving and rolling cement soil
(1) Spreading and leveling cement soil
Filling in the direction of a foundation pit by adopting an occupying method, paving the cement soil 4 by using a loader and a bulldozer, and leveling by using a land leveler and a frog ramming machine. Spreading a layer of cement 3 before spreading the first layer of cement, and spreading the virtual material of cement soil 4 to obtain a virtual thickness t of the spread material 0 Thickening to 500mm. Firstly, rough leveling is performed by using a loader and a flat vibrator, and then 3-5 times are performed by using a land leveling machine and a frog rammer according to the sequence of the periphery and the middle. And (5) leveling the corner positions by adopting superfilling and manual matching.
Further, the prepared cement soil 4 is paved and pressed within 2 hours.
(2) Cement soil compaction
Immediately adopting a 20t low-frequency high-amplitude vibratory roller and bump vibratory roller to start rolling after the cement soil 4 is paved and leveled. The rolling mode is parallel to the axis direction, and the forward and backward full-vibration offset method is used for rolling back and forth comprehensively, and the rolling is performed by adjacent staggered arrangement from the outer side to the inner side. The vibration rolling times of the convex blocks are controlled to be 10 times, firstly, the static pressure is carried out for 2 times in the longitudinal and transverse directions, then the vibration rolling is carried out for 6 times in the longitudinal and transverse directions, finally, the static pressure is carried out for 2 times, and the surface is collected until the surface is flat and no obvious indentation exists. The running speed is not more than 2.5km/h when rolling, the rolling is started, the rolling is suitable to run slowly, the rolling track is about 1/2 of the rolling width by adopting a track rolling method, and the rolling track is not less than 200mm. Large construction machines such as bulldozers, excavators and the like cannot turn around, brake or turn around on the rolled cement soil 4 suddenly, so that obvious tracks are prevented from being left.
Further, during the sectional construction, the joint of two adjacent sections should be cut into a slope shape or a tooth shape, the gradient is not steeper than 1:3, the joint positions are mutually overlapped when rolling, the overlap width is controlled between 0.3-0.5 m, and the paving and rolling processes of the two adjacent sections are simultaneously carried out.
Further, a small electric frog compactor and manual compaction are adopted to compact the vicinity of the corner part which cannot be compacted by the vibration mill, and the compaction times are 5-7. When rolling, if the phenomena of spring soil, loose soil, peeling and the like are bad, the cement 3 is timely turned over and excavated, and a proper amount of cement 3 is added for re-mixing or replaced by new cement soil 4. And (3) manually paving fine materials of the cement soil 4 at the rolling wave pits, and continuously rolling until the surface is flat and no obvious indentation exists.
Further, the time from the mixing to the compaction of the soil cement 4 is controlled within 4 hours.
Attention points in construction: in the rolling process, the surface of the cement soil 4 is always kept moist, and if the water evaporates too fast, a small amount of water is timely added.
S06, quality inspection
And immediately measuring the settlement amount, checking the compactness and detecting the water content after the cement soil 4 is paved and rolled.
(1) Settlement measurement
The settlement is measured by a leveling instrument by adopting a square grid method, and the forming thickness t of the spreading material is ensured 1 =200mm. And the exceeding or the shortage part is adjusted by manual cooperation.
(2) Compaction test
And (3) dry density detection is carried out on the cement soil 4 by adopting a sand filling method or a nuclear densimeter, and then comparison check is carried out with a cutting ring method to determine whether the compactness k is more than or equal to 0.95. And when the compactness does not meet the designed foundation treatment requirement, rolling is continued until the compactness meets the requirement.
(3) Water content detection
And (3) carrying out tracking detection on the water content of the cement soil 4 by adopting an alcohol burning loss method and an oven method on site.
S07, repeating the construction of the upper layer of cement soil
A layer of cement soil 4 is paved and rolledAnd after the quality inspection is qualified, repeating the steps S03, S04 and S05, and carrying out uninterrupted construction on the cement soil 4 on the previous layer, wherein the construction on each layer is carried out from bottom to top until the total thickness T=2200 mm of the foundation treatment is finished. In this example, the virtual thickness t of the pavement of each layer of the cement soil 4 0 Spreading forming thickness t =400 mm 1 =200 mm, co-layed, rolled 11 layers. The construction of each layer of the cement soil 4 follows the principle of quick paving, quick leveling, compaction and quick detection.
Further, the joint of the cement soil 4 layers is cut into a slope shape or a tooth ridge shape, the gradient is not steeper than 1:3, the width is controlled within 500-1000 mm, and the joint positions of all layers are staggered by 500-1000 mm. After each layer of cement soil 4 is rolled, the loose cement soil 4 at the joint is removed.
Further, after rolling of each layer of cement soil 4 is completed, quality detection is completed within 4 hours, and covering of the upper layer of cement soil 4 is completed within 6-8 hours.
Attention points in construction: the construction should take particular attention to weather changes. And stopping construction in the continuous low-temperature overcast and rainy weather, and rapidly rolling, covering and covering the paved cement soil 4 to ensure that the water content of the cement soil 4 does not change greatly. When in winter construction, the rolled cement soil 4 is covered with heat preservation measures to prevent freezing; if frozen into blocks, mechanically crushed or temporarily removed, and reused after thawing. When the construction is interrupted due to reasons, new and old joint surfaces are shaved and then the joint is constructed after the construction is restored, the joint is lapped according to a slope shape or a tooth bank shape, the lapping width is not less than 2m, and the joint is reinforced and rolled.
S08, maintenance of the filling area
And (3) rolling, filling and replacing all the cement soil 4 in the filling area 6, adopting geotextile, plastic films or straw bags for heat preservation and covering, and carrying out sprinkling maintenance for not less than 7 days. The water sprinkling frequency per day is determined according to the climate and humidity conditions, the water sprinkling amount and the water sprinkling frequency are properly reduced in rainy days, the water sprinkling amount and the water sprinkling frequency are properly increased in sunny days, and the surface of the cement soil 4 is always kept moist during maintenance.
S09, ramming pile edge-locking construction
And tamping and expanding piles 7 by cement and gravel soil 9 along the periphery of the edge of the filling area 6 for locking. The diameter of the rammed pile 7 is 550mm, the distance between piles is 1.2m, the pile body is made of cement and gravel soil 9, the volume ratio of the cement and the gravel soil=2:5, the cement 3 in each gravel soil is not less than 200kg, the cement 3 is made of P.O 42.5.5 ordinary Portland cement, the particle size of the gravel is 10-30 mm, and the water content of the mixture is controlled to be within +/-2% of the optimal water content WOP. Firstly, a pile machine is used for aligning and forming holes to the depth of deep design of pile ends, a heavy hammer is used for tamping 1-2 shots, then cement and gravel soil 9 stones are filled into the pile holes, and a pile deep area of 800-1200 mm at the lower part of a formed pile is continuously tamped and expanded to form an enlarged head of the pile body; the subsequent feeding is carried out for 0.1 to 0.2m3 each time, and 2 to 3 shots are tamped with the pile depth of each 500 to 800 mm; and the ramming is not less than 3 strokes within the depth range of 2.0m of the pile top, and the weight of each ramming hammer is about 3t, so that the continuity and compactness of the pile body are ensured. The pile forming test requires that the bearing capacity of the composite foundation reach 220kPa.
Further, after the edge locking construction of the rammed pile 7 of the whole filling area 6 is completed, the bearing capacity and the compressibility of the foundation of the cement soil 4 are measured by a bearing capacity tester, the strength of the cement soil 4 is ensured to reach 0.8MPa, evaluation is made on foundation treatment, and whether the foundation treatment design requirement is met is verified.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. The foundation treatment method for the foundation vibration control of the power machine is characterized by comprising the following steps of: the method comprises the following steps:
s1) a foundation treatment scheme is planned, and foundation treatment parameters are designed:
combining the running frequency characteristic of the power machine and the displacement characteristic of the foundation of the power machine, and developing a foundation treatment scheme for rolling cement soil replacement and tamping pile lockstitch by simulating foundation dynamic characteristic test, and designing a replacement filler, a mixing ratio, a total foundation treatment thickness T, a compaction coefficient k and an optimal water content WOP of foundation treatment;
s2) material preparation and construction process test:
cement is selected as a filling material, cement in the cement soil adopts bulk composite silicate cement, qualified soil materials are taken, cement is added according to a mixing ratio designed by foundation treatment after screening, cement is mechanically mixed uniformly, a compaction test is carried out by adopting an electric compaction instrument, a water content-dry density compaction curve of the cement soil is drawn, the optimal water content WOP and the corresponding maximum dry density rho of the cement soil are analyzed and determined, a field rolling construction process test is carried out according to parameters obtained by the indoor compaction test, and construction control parameters are further verified and determined: rolling machine, pavement thickness t0, rolling pass number, compacting machine, rolling forming thickness t1, compaction coefficient k, optimal water content WOP and maximum dry density ρ;
s3) replacement and filling preparation work;
the foundation pit excavation of the on-site foundation treatment filling area is carried out while the material preparation and construction process tests are carried out, the underground water level is firstly reduced to 500mm below the elevation of the bottom surface of the foundation pit of the filling area before filling, no ponding exists in the foundation pit, the bottom surface of the foundation pit of the filling area is subjected to leveling treatment, all weak interlayers, silt, floating soil and sundries are thoroughly removed, the water content is proper through airing, the on-site groove inspection is carried out, and the elevation of the bottom surface of the foundation pit of the filling area is retested;
s4) mixing and transporting cement soil:
according to the soil mass amount of the filling area, cement is added into the soil material in batches to be mixed to form cement soil;
s5) cement soil paving and rolling:
filling in the direction of a foundation pit by adopting an approach method, paving cement soil by using a loader and a bulldozer, leveling by using a grader and a frog ramming machine, immediately starting to grind by using a low-frequency high-amplitude vibration road roller and a bump vibration roller, comprehensively grinding in a parallel axis direction by a forward and backward full-vibration offset method, grinding by adjacent staggered arrangement from the outer side to the inner side, grinding the joints of two adjacent sections into a slope shape or a tooth shape, wherein the gradient is not steeper than 1:3, the joint positions are mutually overlapped during grinding, the overlap joint width is controlled to be between 0.3 and 0.5m, and the steps of paving and grinding of two adjacent sections are simultaneously carried out;
s6) quality inspection:
measuring the settlement by using a square grid method, checking whether the rolling forming thickness t1 meets the design requirement or not by using a leveling instrument, manually matching and adjusting the exceeding or insufficient part, detecting the dry density by adopting a sand filling method or a nuclear densimeter, comparing and checking with a ring cutter method, wherein the sampling depth of the ring cutter is 1/3 of the rolling forming thickness t1, calculating the average dry density according to a plurality of measuring points, comparing with the maximum dry density ρ corresponding to the optimal water content WOP, determining whether the compaction coefficient k meets the designed foundation treatment requirement or not, and continuously rolling until the compaction coefficient does not meet the designed foundation treatment requirement, and tracking and detecting the water content of cement soil by adopting an alcohol burning loss method or an oven method on site until the compaction coefficient does not meet the requirement;
s7) repeating the construction of the upper layer of cement soil:
after a layer of cement soil is paved, rolled and inspected to be qualified in quality, repeating the steps S3, S4 and S5, and carrying out uninterrupted construction on the upper layer of cement soil from bottom to top until the construction of each layer within the total thickness T of foundation treatment is completed;
s8) maintenance of the filling area:
rolling, filling and covering all cement soil in the filling area by geotextile, plastic film or straw bag, and sprinkling and curing for at least 7 days;
s9) ramming pile edge locking construction:
the pile edge is sealed by tamping cement gravel soil along the periphery of the filling area, a pile machine is firstly used for aligning and forming holes to the designed depth, a heavy hammer is used for tamping and then filling cement gravel soil stones into the pile holes, and a region with the depth of 800-1200 mm at the lower part of the pile is continuously tamped and expanded to form an enlarged head of the pile body, so that the continuity and compactness of the pile body are ensured;
s10) evaluating foundation treatment:
after the construction of the rammed pile edge locking of the whole filling area is finished, the bearing capacity tester is used for measuring the bearing capacity and the compressibility of the foundation of the cement soil, and the foundation treatment is evaluated to verify whether the foundation treatment design requirement is met.
2. The foundation treatment method for vibration control of foundation of power machine according to claim 1, wherein in step S4), the cement is added and mixed with soil material by road mixing, gridding paving construction, or plant mixing method is adopted in foundation treatment construction of large-scale power machine, and cement soil is mixed by a mixer.
3. The foundation treatment method for foundation vibration control of power machine according to claim 2, wherein in step S4), the water content of the cement soil is checked in time during the mixing process, and the deviation between the water content and the optimum water content WOP is controlled to be-2% to +3%.
4. The foundation treatment method for foundation vibration control of power machine according to claim 1, wherein the soil cement paving in step S5) is completed within 2 hours, and the time from the completion of mixing to the completion of rolling compaction is controlled within 4 hours.
5. The foundation treatment method for foundation vibration control of power machine according to claim 1, wherein the quality inspection in step S7) is completed within 4 hours after completion of rolling of each layer of cement soil, and the covering of the upper layer of cement soil is completed within 6 to 8 hours.
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