CN116103969A - High-efficiency highway engineering saline soil roadbed treatment process - Google Patents
High-efficiency highway engineering saline soil roadbed treatment process Download PDFInfo
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- CN116103969A CN116103969A CN202211401134.5A CN202211401134A CN116103969A CN 116103969 A CN116103969 A CN 116103969A CN 202211401134 A CN202211401134 A CN 202211401134A CN 116103969 A CN116103969 A CN 116103969A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a high-efficiency highway engineering saline soil subgrade treatment process, which comprises the following steps of: before construction, the repeated route measurement, the repeated level point measurement and the encryption work are required to be implemented, and the stock yard raw material test detection and the field check on design files and drawings are completed; implementing the geological condition of the section of route; measuring lofting and clearing the surface, and then leveling the road; accurately setting out before filling, setting out a square grid of filling after setting out the slope foot line of the roadbed according to the elevation and the middle pile position, controlling the distribution condition according to the quantity of materials conveyed by each transport vehicle, discharging the filling in the square grid after the construction, filling the roadbed from low to high, and carrying out horizontal layered filling; compacting the roadbed; measuring porosity by adopting a water irrigation method, and measuring a sedimentation difference corresponding to the porosity; and (5) shaping the roadbed. According to the invention, salt expansion is avoided through the high-efficiency highway engineering saline soil subgrade treatment process, the construction quality is ensured, and the construction cost is reduced.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a high-efficiency highway engineering saline soil subgrade treatment process.
Background
When the salty soil is used as a highway subgrade, the highway subgrade is easy to suffer from diseases such as salt expansion, dissolution, deformation, slurry turning and erosion, so that the construction quality of highway engineering is seriously affected, and the salty soil has great potential safety hazard to the safety of passing vehicles. Common methods for treating saline soil are as follows: (1) geosynthetic material barrier layers; (2) a gravel pack; (3) aeolian sand or river sand separating layer { take from highway salty soil roadbed construction technical discussion, how good, huadong highway 3 rd 2018, 6 months and 20 days }. However, the above-described treatment method has the following problems and disadvantages: (1) all salinized soil regional characteristics cannot be considered, some projects are located in a 50km gobi unmanned area of Yizhou area ya Man Suzhen in Hami, common strong wind, high temperature and 2-3mm of annual average precipitation in project construction range, gravel or broken stone isolating layers in the literature do not have proper aggregate on site, and the site is mainly made of silt; (2) aeolian sand or river sand barrier layer: in some project construction ranges, the past water passing areas mostly occupy the national forest and grass land, the consumption of all-line isolation layers cannot be met, the procedures of the forest land and the grass land are complex, large-area exploitation cannot be achieved, and the method is not suitable for the project. (3) Because some areas are special in geographic position and are close to the national natural protection areas, the construction site cannot be excavated in a large scale to damage the original landform and grasslands in the river course range in order to protect the natural environment. (4) Some of the earth materials in the unmanned area are mainly medium salt and strong salt, the weak salt can be used as common roadbed filling materials, and the medium salt and the strong salt can be used as roadbed filling materials after being treated by adopting certain technical measures, so that the method is not suitable for local construction operation. The invention provides a high-efficiency highway engineering saline soil roadbed treatment process, which adopts a stone-filled roadbed to replace the saline soil roadbed so as to solve the problem of roadbed salt expansion in the saline soil area and consider the construction requirements and applicability conditions of projects in gobi unmanned areas.
Disclosure of Invention
The invention aims to provide an efficient highway engineering saline soil subgrade treatment process which is used for solving the problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a high-efficiency highway engineering saline soil subgrade treatment process comprises the following steps:
s1, carrying out line retest, level point retest and encryption work before construction, and finishing stock ground raw material test detection and field check on design files and drawings;
s2, implementing the geological condition of the section of route;
s3, measuring lofting and surface cleaning, then leveling the road, recovering piles in the route before construction, accurately discharging the roadbed filling range after measuring the original ground elevation, and spraying lime lines for on-site cleaning after the protective piles are bound on the roadbed side;
s4, accurately laying out the materials before filling, and after laying out the roadbed slope foot line according to the elevation and the middle pile position, sprinkling out a filler square grid, controlling the distribution condition according to the quantity of materials conveyed by each transport vehicle, discharging the filler in the square grid after the construction, and filling the roadbed from low to high, so as to carry out horizontal layered filling;
s5, compacting the roadbed, namely firstly compacting two sides and then compacting the middle, overlapping a transverse joint by 0.4-0.5m, longitudinally overlapping front and rear adjacent sections by 1.0-1.5m, and adopting a road roller to carry out static pressure for 2 times during rolling, then carrying out vibration compaction from weak to strong until the top surface of a roadbed compacting layer is stable, no wheel track exists, stone blocks are compact and the surface is flat, and detecting the roadbed;
s6, measuring the porosity by adopting a water irrigation method, measuring the corresponding sedimentation difference, and carrying out strict self-inspection on the rolled roadbed working face of each layer;
s7, shaping the roadbed, recovering each middle pile and each side pile, and checking the route position, the width, the longitudinal slope, the transverse slope, the side slope and the corresponding elevation of the roadbed according to the requirements of a design drawing; the soil subgrade is shaped by a method of combining manpower and machinery, the deep cutting slope is shaped according to the gradient required by design, and the slope is brushed from top to bottom; and (5) checking the reinforced slope shaping, and if the slope shaping is unqualified, processing in time.
S8, compacting and self-checking each layer of filling material, conforming to the standard requirement, and filling the next layer after inspection and approval by a supervision engineer; each layer of filling is provided with a special person to strictly grasp the position of unloading and the layering thickness, and the transportation vehicles are uniformly distributed and run within the whole roadbed filling width; the testers should follow the work to measure the sedimentation difference, so that the degree of solidity of each layer meets the design and specification requirements.
Further, in step S2, it is necessary to determine the type of rock along the line, including sandstone, conglomerate, mudstone, tuff, and volcanic breccia.
Further, the method also comprises a step S9, wherein the concrete process is that excavation of the culvert foundation pit is carried out in a period of low daily air temperature, and the influence of sunlight on the frozen soil of the culvert base is reduced; and (3) constructing the culvert foundation in a period of high daily air temperature so as to ensure the construction quality.
Further, in step S5, small stones or stone scraps are manually used for filling up and filling gaps at any time during compaction; for large hard materials which cannot be crushed by compaction equipment, the large hard materials are removed or crushed by manpower, and the maximum size of the crushed hard materials is not more than 2/3 of the thickness of the compaction layer and is uniformly distributed.
Further, in step S6, when the porosity of the filled-stone roadbed meets the standard requirement, observing the sedimentation difference, wherein the sedimentation difference observing method comprises a filled-stone embankment elevation difference detecting method, and the method comprises the following steps:
a1, laying measuring points: 5 control points are distributed on each section surface of the test section, and at least 3 sub-control points are distributed on each control point so as to ensure the reliability of a test result, so that quantitative analysis is carried out, and the compaction standard of the rock filling embankment is determined;
a2, measuring elevation of each measuring point by using a precise instrument before rolling;
a3, carrying out secondary elevation observation after twice heavy vibration rolling, and taking the obtained sedimentation difference as a detection basis of roadbed construction quality.
Further, the step S8 further includes the following steps: and each three layers of the roadbed are used for checking and correcting the center line, the elevation and the width of the roadbed in the roadbed filling process so as to ensure the roadbed filling quality.
The beneficial effects are that: the salinized soil roadbed treatment process provided by the invention has the advantages that a new construction process is adopted, the stone roadbed can play a role in isolating faults, salt expansion is avoided, the construction quality is ensured, a high-power excavator is increased, the stone is excavated to change the filling roadbed into the stone roadbed, the construction quality is excellent, good social benefits are obtained, the cost is relatively lower than that of the remotely-transported and outsourced gobi material from the aspect of economic benefit comparison, and the salinized soil roadbed treatment process is worthy of popularization in the construction process of the salinized soil roadbed.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below by way of examples or the description of the prior art, and it is apparent that the following descriptions of specific embodiments are only some examples of the present invention, and other embodiments may be obtained according to the following examples without inventive effort to those of ordinary skill in the art. It should be noted that the description of these examples is for aiding in understanding the present invention, but is not intended to limit the present invention.
Examples:
the embodiment provides a high-efficiency highway engineering saline soil subgrade treatment process, which comprises the following steps:
s1, carrying out line retest, level point retest and encryption work before construction, and finishing stock ground raw material test detection and field check on design files and drawings; the main personnel and the test personnel for management and construction are in place, and the mechanical driver and other auxiliary personnel are in place.
S2, implementing the geological condition of the section of route.
S3, measuring lofting and surface cleaning, then leveling the road, recovering piles in the route before construction, accurately discharging the roadbed filling range after measuring the original ground elevation, and spraying lime lines for on-site cleaning after the protective piles are bound on the roadbed side; the method provides a reliable basis for the compaction degree detection of rolling before filling after on-site cleaning in construction, and the frequency selective inspection after rolling meets the specified compaction degree requirement of more than or equal to 90% according to the technical specification requirement. When the measurement lofting is carried out, an obvious construction control mark is set; the width of the clear gauge is 30cm widened by designing slope foot lines on two sides of the road, and the depth of the clear gauge is 30cm; and (3) when leveling, adopting a loader for rough leveling and a grader for fine leveling.
S4, accurately laying out the materials before filling, and after laying out the roadbed slope foot line according to the elevation and the middle pile position, sprinkling out a filler square grid, controlling the distribution condition according to the quantity of materials conveyed by each transport vehicle, discharging the filler in the square grid after the construction, and filling the roadbed from low to high, so as to carry out horizontal layered filling; the paving thickness of each layer is controlled within 50cm, the stone quantity of each square lattice is calculated through a temporary loose paving coefficient, the unloading quantity is controlled, the packing thickness is strictly controlled, super-thick filling is strictly forbidden, and the packing is carried out by widening 30cm each side in order to ensure that the edge of the rolled embankment has enough compactness. After the filler is transported to a construction site, the filler is paved and rough and flat by a loader, and the paving thickness is checked in time. And (3) timely processing the thickness exceeding the standard requirement, and finally leveling by using a grader to ensure that each point position of each layer is controlled within the range of the loose thickness required by the standard.
S5, compacting the roadbed, namely firstly pressing two sides and then pressing the middle, wherein the transverse joint is overlapped by 0.4-0.5m, and the front and rear adjacent sections are longitudinally overlapped by 1.0-1.5m, so that the compaction quality is ensured without pressure leakage and dead angles. When rolling, adopting a road roller to carry out static pressure for 2 times firstly, then carrying out vibration pressing from weak to strong firstly and then carrying out vibration pressing quickly, wherein the running speed of the road roller is controlled to be 1-2km/h, namely, the road roller is compacted by using a lowest grade accelerator until the top surface of a roadbed compacted layer is stable, no wheel track exists, stone blocks are compact, and the surface is flat, and then detecting the roadbed; the roadbed filler stones are not compressible per se, and the purpose of compression is to change the loose contact state between the granules into a tight occlusion state.
S6, measuring the porosity by adopting a water filling method, measuring the corresponding sedimentation difference, strictly self-checking the rolled roadbed working surface of each layer, requiring the roadbed working surface to be smooth and compact, free of pits, segregation, obvious wheel marks and the like, scattering white ash on the boundary and the center line of the roadbed on the roadbed working surface to be checked after the self-checking is qualified, and defining the range of filling the roadbed, and checking and accepting by a report and supervision engineer. In the rolling process, related personnel such as measurement, test, supervision and the like measure and record, measure and record the porosity of roadbed filling materials under different rolling passes and the sedimentation difference after rolling until the specified porosity requirement is met, and record the sedimentation difference at the moment.
S7, shaping the roadbed, recovering each middle pile and each side pile, and checking the route position, the width, the longitudinal slope, the transverse slope, the side slope and the corresponding elevation of the roadbed according to the requirements of a design drawing; the soil subgrade is shaped by a method of combining manpower and machinery, the deep cutting slope is shaped according to the gradient required by design, and the slope is brushed from top to bottom; and (5) checking the reinforced slope shaping, and if the slope shaping is unqualified, processing in time.
S8, compacting and self-checking each layer of filling material, conforming to the standard requirement, and filling the next layer after inspection and approval by a supervision engineer; each layer of filling is provided with a special person to strictly grasp the position of unloading and the layering thickness, and the transportation vehicles are uniformly distributed and run within the whole roadbed filling width; the testers should follow the work to measure the sedimentation difference, so that the degree of solidity of each layer meets the design and specification requirements.
Measurement and test instrument employed in step S1: two sets of Zhonghaida RTKs, 1 total station, 4 sets of leveling instrument, 5 handles of 50m steel rule, 10 handles of 5m steel tape, 2 sets of sand filling cylinder and 2 sets of electronic balance.
The expandable rock and the easily soluble rock are not suitable for being directly used for embankment filling, the strongly weathered rock is not suitable for being directly used for filling, and the disintegrating rock and the salinized rock are not suitable for being directly used for filling. Fillers exceeding 25cm in size are removed.
The roadbed substrate is thoroughly cleaned, widened filling is adopted when filling is carried out, temporary drainage is carried out, construction channels are repaired, and special people and materials are organized to carry out maintenance work. Meanwhile, the protective measures in rainy season are taken.
In another embodiment of the present invention, on the basis of embodiment 1, further comprising step S9 of excavating a culvert foundation pit in a period of low daily air temperature, so as to reduce the influence of solar radiation on the frozen soil of the culvert foundation; and (3) constructing the culvert foundation in a period of high daily air temperature so as to ensure the construction quality.
In another embodiment of the invention, in step S2, it is desirable to determine along-line rock types, including sandstone, conglomerate, mudstone, tuff, and volcanic breccia.
In another embodiment of the invention, in step S5, small stones or stone chips are manually used at any time to fill up and fill up gaps during compaction; for large hard materials which cannot be crushed by compaction equipment, the large hard materials are removed or crushed by manpower, and the maximum size of the crushed hard materials is not more than 2/3 of the thickness of the compaction layer and is uniformly distributed.
In another embodiment of the present invention, as shown in table 1 (table of the compaction quality standards for upper and lower embankments of the rockfill bed in the present invention):
TABLE 1
In step S6, when the porosity of the stone-filled roadbed meets the standard requirement, observing the sedimentation difference, wherein the sedimentation difference observation method comprises a stone-filled embankment elevation difference detection method, and comprises the following steps of:
a1, laying measuring points: as the stone is used as roadbed filler, the grain size is larger, so that the grain material has a dislocation phenomenon in the rolling process, and the reliability of the test result is easily reduced. 5 control points are distributed on each section surface of the test section, and at least 3 sub-control points are distributed on each control point so as to ensure the reliability of a test result, so that quantitative analysis is carried out, and the compaction standard of the rock filling embankment is determined;
a2, measuring elevation of each measuring point by using a precise instrument before rolling;
a3, carrying out secondary elevation observation after twice heavy vibration rolling, and taking the obtained sedimentation difference as a detection basis of roadbed construction quality.
In another embodiment of the present invention, the step S8 further includes the steps of: and each three layers of the roadbed are used for checking and correcting the center line, the elevation and the width of the roadbed in the roadbed filling process so as to ensure the roadbed filling quality.
A sound quality management system is also established in the process:
the quality assurance system of quality inspection and test technology taking project manager as the first responsible person and taking master worker as the responsibility is established, the quality responsibility system is established, the technical management is perfected, and the engineering quality is ensured.
Quality inspection: the project manager sets up quality inspection engineers, each team work team establishes quality inspectors, a three-level management system is implemented, each process must be inspected by internal self-inspection, mutual inspection and quality inspection engineers, and after inspection and confirmation by the supervision engineers, the construction of the next process can be carried out.
And (3) testing: the project manager establishes a construction site laboratory and is comprehensively responsible for the test and detection work of the whole project. And a conventional laboratory is set up at each construction point, so that standard tests are ensured before each project is started, inspection tests are performed in construction, and perfect data are obtained after completion.
Measurement: project manager and construction team form measurement group, responsible for the restoration routing of whole line engineering and the control measurement in the work progress, make construction control measurement management, lofting work, guarantee the measurement work of construction whole process. The measured data are strictly regulated according to the specification, carefully arranged, and the data are ensured to be correct and complete.
The quality information circulation link is grasped, a quality feedback system is established, and the detection, collection, processing, transmission and storage of data are noticed and mastered.
Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The high-efficiency highway engineering saline soil subgrade treatment process is characterized by comprising the following steps of:
s1, carrying out line retest, level point retest and encryption work before construction, and finishing stock ground raw material test detection and field check on design files and drawings;
s2, implementing the geological condition of the section of route;
s3, measuring lofting and surface cleaning, then leveling the road, recovering piles in the route before construction, accurately discharging the roadbed filling range after measuring the original ground elevation, and spraying lime lines for on-site cleaning after the protective piles are bound on the roadbed side;
s4, accurately laying out the materials before filling, and after laying out the roadbed slope foot line according to the elevation and the middle pile position, sprinkling out a filler square grid, controlling the distribution condition according to the quantity of materials conveyed by each transport vehicle, discharging the filler in the square grid after the construction, and filling the roadbed from low to high, so as to carry out horizontal layered filling;
s5, compacting the roadbed, namely firstly compacting two sides and then compacting the middle, overlapping a transverse joint by 0.4-0.5m, longitudinally overlapping front and rear adjacent sections by 1.0-1.5m, and adopting a road roller to carry out static pressure for 2 times during rolling, then carrying out vibration compaction from weak to strong until the top surface of a roadbed compacting layer is stable, no wheel track exists, stone blocks are compact and the surface is flat, and detecting the roadbed;
s6, measuring the porosity by adopting a water irrigation method, measuring the corresponding sedimentation difference, and carrying out strict self-inspection on the rolled roadbed working face of each layer;
s7, shaping the roadbed, recovering each middle pile and each side pile, and checking the route position, the width, the longitudinal slope, the transverse slope, the side slope and the corresponding elevation of the roadbed according to the requirements of a design drawing; the soil subgrade is shaped by a method of combining manpower and machinery, the deep cutting slope is shaped according to the gradient required by design, and the slope is brushed from top to bottom; and (5) checking the reinforced slope shaping, and if the slope shaping is unqualified, processing in time.
S8, compacting and self-checking each filling layer of filler, conforming to the standard requirement, and filling the next layer after inspection and approval by a supervision engineer; each layer of filling is provided with a special person to strictly grasp the position of unloading and the layering thickness, and the transportation vehicles are uniformly distributed and run within the whole roadbed filling width; the testers should follow the work to measure the sedimentation difference, so that the degree of solidity of each layer meets the design and specification requirements.
3. An efficient highway engineering saline soil subgrade treatment process according to claim 1, wherein in step S2, it is desired to determine the type of rock along the line including sandstone, conglomerate, mudstone, tuff and volcanic brewster.
4. The process for treating the salty soil subgrade of the high-efficiency highway engineering according to claim 1, further comprising the step S9, wherein the concrete process is that the excavation of the culvert foundation pit is carried out in a period with low daily air temperature, and the basic construction of the culvert is carried out in a period with high daily air temperature.
5. The process for treating a salty soil subgrade for highway engineering according to claim 1, wherein in step S5, small stones or stone chips are manually used for filling up and filling gaps at any time during compaction; for large hard materials which cannot be crushed by compaction equipment, the large hard materials are removed or crushed by manpower, and the maximum size of the crushed hard materials is not more than 2/3 of the thickness of the compaction layer and is uniformly distributed.
6. The process for treating the salty soil subgrade of the high-efficiency highway engineering according to claim 1, which is characterized in that in the step S6, the settlement difference is observed when the porosity of the filled stone subgrade meets the standard requirement, and the settlement difference observation method comprises a filled stone embankment elevation difference detection method, and comprises the following steps:
a1, laying measuring points: 5 control points are distributed on each section surface of the test section, and at least 3 sub-control points are distributed on each control point so as to ensure the reliability of a test result, so that quantitative analysis is carried out, and the compaction standard of the rock filling embankment is determined;
a2, measuring elevation of each measuring point by using a precise instrument before rolling;
a3, carrying out secondary elevation observation after twice heavy vibration rolling, and taking the obtained sedimentation difference as a detection basis of roadbed construction quality.
7. The process for treating a salty soil subgrade for highway engineering according to claim 1, wherein said step S8 further comprises the steps of: and each three layers of the roadbed are used for checking and correcting the center line, the elevation and the width of the roadbed in the roadbed filling process so as to ensure the roadbed filling quality.
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| CN117323706A (en) * | 2023-12-01 | 2024-01-02 | 山东电力建设第三工程有限公司 | Construction method of double-medium gravity type filter tank of large-scale sea water desalination water plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117323706A (en) * | 2023-12-01 | 2024-01-02 | 山东电力建设第三工程有限公司 | Construction method of double-medium gravity type filter tank of large-scale sea water desalination water plant |
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