CN113737591A - Construction method for filling highway subgrade by solidifying sea sand soil - Google Patents
Construction method for filling highway subgrade by solidifying sea sand soil Download PDFInfo
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- CN113737591A CN113737591A CN202111228265.3A CN202111228265A CN113737591A CN 113737591 A CN113737591 A CN 113737591A CN 202111228265 A CN202111228265 A CN 202111228265A CN 113737591 A CN113737591 A CN 113737591A
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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
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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
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
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Abstract
The invention discloses a construction method for filling a highway subgrade by solidifying sea sand soil, which comprises the following steps: s1, preparing soil; s2, pumping water and dredging; s3, mixing outside the field; s4, backfilling layer by layer; s5, leveling road mixing; and S6, rolling and forming. The invention adopts solidified sea sand soil, can obtain local materials, has low transportation cost, reduces the construction cost, simultaneously can protect cultivated land, reduces the environmental damage, has small sea sand soil particles, can complete the stirring process without needing to be equipped with enough stirring machines on the spot, has small stirring times, can save the construction stirring time, and can ensure normal soil transportation and leveling construction after raining because the sea sand soil has good water seepage performance, the surface can not be muddy after raining, and the construction can be rapidly switched to construction after raining, is basically not restricted by rainy seasons, and has quick construction progress.
Description
Technical Field
The invention belongs to the technical field of roadbed construction, and particularly relates to a construction method for filling a highway roadbed by solidifying sea sand soil.
Background
The method is characterized in that water circulates on three sides of the north side of the sea entrance of the Yangtze river, the shape of the water is similar to that of a peninsula, the coastal road section is in a soft soil foundation area, the terrain is low, the river pond and water system are developed, in the construction of highways in the coastal area, the conditions of difficult soil taking and poor soil source are frequently met, if soil is transported from a far distance, cultivated land and ecological resources are greatly damaged, the cost of engineering soil preparation and soil transportation is greatly increased, in addition, if the engineering progress is tightly required and insufficient time is used for soil preparation, the construction task cannot be completed on time at all, and the method is a small problem for relatively fast-developing coastal construction. In the aspect of carrying, a large amount of sand sources exist in coastal areas, the carrying distance is short, and for projects directly facing the sea, the projects can be directly taken from the sea and used for construction sites, but the roadbed filled by sea sand is not properly constructed and treated, and diseases such as pavement collapse, salt expansion, roadbed instability and the like are easily generated.
In order to solve the technical problem, technical research is carried out on sea sand soil filling highway subgrade construction technology, a construction method for filling coastal highway subgrades with solidified sea sand soil is formed through summary analysis, and in order to ensure the correct use of the technology and ensure the engineering quality, the construction method is formulated to be beneficial to engineering implementation by referring to relevant reference documents such as highway geotechnical test regulations (JTGE 40-2007), highway engineering technical standards (JTGBO1-2003), highway subgrade construction technical specifications (JTGF 10-2006), highway engineering inorganic building material stable material test regulations (JTGF51-2009), highway subgrade and road surface field test regulations (JTG 6O-2008) and highway engineering quality inspection and assessment standards (JTG 80/1-2001).
Disclosure of Invention
The invention aims to provide a construction method for filling highway subgrade by solidifying sea sand soil, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a construction method for filling highway subgrade by solidifying sea sand soil comprises the following steps:
s1, preparing soil;
s2, pumping water and dredging;
s3, mixing outside the field;
s4, backfilling layer by layer;
s5, leveling road mixing;
and S6, rolling and forming.
Preferably, the specific method for preparing the soil in the S1 comprises the following steps:
s101, after carrying out reclamation on the sea sand soil reserve area, taking the sea sand soil from the beach, transporting the sea sand soil to a construction site for use, detecting the water content through a laboratory, and carrying out in-situ soil reserve on the beach for piling according to the characteristics of the sea sand soil;
s102, performing grid digging and soil preparation according to the working range of the excavator arm, performing soil preparation in a grid-empty grid mode to reduce the water content of the sea sand soil, and detecting the water content of the piled earthwork in a laboratory every day until the water content is reduced to meet the construction requirement;
s103, transporting the sea sand meeting the water content requirement to a soil piling area of a roadbed construction site, carrying out smoldering treatment on the sea sand by using quick lime, detecting that the water content is 3-4% of the optimal water content, and using the sea sand for roadbed backfilling;
and S104, the ash amount of the sea sand soil subjected to ash stewing treatment meets the standard requirement, and the sea sand soil is used for filling after being detected to be qualified.
Preferably, the soil preparation process in S1 further includes: the earthwork transportation is carried to the site by using a certain number of earthwork transport vehicles, and the number of the earthwork transport vehicles is equipped according to the construction efficiency and the transport distance of the soil loading excavator, so that continuous construction of the roadbed at the construction site is ensured.
Preferably, the pumping and dredging in the S2 is performed by cleaning the substrate by using an excavator to remove the silt soft soil foundation.
Preferably, the step-by-step backfilling in S4 includes bottom layer backfilling, second layer backfilling, third layer backfilling, and fourth layer and above layer backfilling.
Preferably, the specific method for backfilling the bottom layer comprises the following steps:
s201, after dredging treatment, filling the lime-stewed sea sand into a clean subgrade bottom layer meeting the backfilling requirement by using an excavator, and performing elevation control in the backfilling process, wherein the number of sections is not less than 3;
s202, controlling the bottom layer backfill loose thickness to be 80cm according to the field condition of the roadbed, if the water level under the roadbed is high and water seepage occurs, increasing the bottom layer fill thickness, but the loose thickness is 81-100cm, and arranging a water collecting well to pump water during backfilling so as to prevent filled sea sand soil from being soaked by water;
s203, backfilling, namely leveling by using an excavator, if ash is added at a place where local ash mixing is not uniform or a place where local soil has a large water content, leveling to a measured thickness by using the excavator, walking for three times on the ash by using the excavator or a large bulldozer crawler, enabling the excavator to walk stably, enabling the surface to basically have no spring, namely meeting the requirement of backfilling the bottom layer, detecting the compactness of the bottom layer after detection to meet the requirement of 87%, enabling the filling width to meet the design requirement, and completely performing secondary soil supplement and slope pasting.
Preferably, the specific method for backfilling the second layer comprises the following steps:
s301, after the bottom layer compaction degree is qualified, a filling second layer is arranged, the smoldering soil is filled into the roadbed by an excavator, the filling thickness is controlled by a lofting pier, the filling loose thickness of the second layer is controlled to be 25cm, the compaction coefficient is 1.25, and ash is filled in a place with local uneven ash mixing;
s302, after leveling by using an excavator, rolling by using an excavator crawler belt, enabling the excavator to walk stably, and after four times of rolling, meeting 90% of requirements after compaction degree detection;
and S303, if the on-site roadbed condition permits, the last rolling is recommended to be carried out by adopting a vibratory roller, and the rolling is ensured not to generate a spring.
Preferably, the third layer backfilling method comprises the following steps:
s401, filling a third layer, filling the smoldering soil into a roadbed by using an excavator, and controlling the filling loose paving thickness of the third layer to be 25 cm;
s402, leveling by using an excavator, arranging a cross slope for drainage during leveling, arranging a simple drainage ditch on the outer side, and carrying out static pressure for three times by using a vibratory roller;
and S403, if the tonnage of the compaction degree is smaller, increasing the rolling times, stabilizing the surface after compaction, and completing the one-time filling of the first layer to the third layer on the same day, wherein the compaction degree meets the requirement.
Preferably, the specific method for backfilling the fourth layer and the above layers comprises the following steps:
s501, filling the position above the fourth layer of skin, filling sea sand soil into a roadbed by using an excavator or a soil transport vehicle, and controlling the filling loose paving thickness to be 25 cm;
s502, leveling by a bulldozer, then carrying out static pressure once by a vibratory roller, beating grid soil ash, controlling the paving area of each square of lime to be 40 square meters, and paving ash manually;
s503, turning and stirring by using a furrow plough and a rotary cultivator, wherein the turning and stirring adopts a mode of stirring 4 ploughshares and 6, when the water content is detected to be +/-2% in a laboratory, after the water content is detected to be within the optimal water content, a vibratory roller is used for static time, a grader is used for leveling, after the water content is detected to be static for two times, a three-wheel roller is used for grinding for 2 times, no obvious track mark exists on the surface, and the compactness meets the design requirement;
s504, if the air temperature is high during construction, the water content of the lime soil is strictly controlled during inkstone pressing, and when the water content is low, water drying treatment is carried out.
Preferably, the method further comprises the following steps: protecting along-river grout and building blocks: when the roadbed is easily soaked by water, the protection along the river side slope is immediately carried out, the mortar sheet adopts a covered edge form, the lower part of the foundation extends to form a silt bottom, and the upper part of the foundation is provided with a platform.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts solidified sea sand soil, can obtain local materials, has low transportation cost, reduces the construction cost, simultaneously can protect cultivated land, reduces the environmental damage, has small sea sand soil particles, can complete the stirring process without needing to be equipped with enough stirring machines on the spot, has small stirring times, can save the construction stirring time, and can ensure normal soil transportation and leveling construction after raining because the sea sand soil has good water seepage performance, the surface can not be muddy after raining, and the construction can be rapidly switched to construction after raining, is basically not restricted by rainy seasons, and has quick construction progress.
Drawings
FIG. 1 is a block flow diagram of the present invention.
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.
Referring to fig. 1, the present invention provides a technical solution: a construction method for filling highway subgrade by solidifying sea sand soil comprises the following steps:
s1, preparing soil;
s2, pumping water and dredging;
s3, mixing outside the field;
s4, backfilling layer by layer;
s5, leveling road mixing;
and S6, rolling and forming.
In this embodiment, preferably, the specific method for preparing soil in S1 includes the following steps:
s101, after carrying out reclamation on the sea sand soil reserve area, taking the sea sand soil from the beach, transporting the sea sand soil to a construction site for use, detecting the water content through a laboratory, and carrying out in-situ soil reserve on the beach for piling according to the characteristics of the sea sand soil;
s102, performing grid digging and soil preparation according to the working range of the excavator arm, performing soil preparation in a grid-empty grid mode to reduce the water content of the sea sand soil, and detecting the water content of the piled earthwork in a laboratory every day until the water content is reduced to meet the construction requirement;
s103, transporting the sea sand meeting the water content requirement to a soil piling area of a roadbed construction site, carrying out smoldering treatment on the sea sand by using quick lime, detecting that the water content is 3-4% of the optimal water content, and using the sea sand for roadbed backfilling;
and S104, the ash amount of the sea sand soil subjected to ash stewing treatment meets the standard requirement, and the sea sand soil is used for filling after being detected to be qualified.
In this embodiment, preferably, the soil preparation process in S1 further includes: the earthwork transportation is carried to the site by using a certain number of earthwork transport vehicles, and the number of the earthwork transport vehicles is equipped according to the construction efficiency and the transport distance of the soil loading excavator, so that continuous construction of the roadbed at the construction site is ensured.
In this embodiment, preferably, in the step S2, the water pumping and dredging are performed by cleaning the substrate with an excavator to remove the silt soft soil foundation.
In this embodiment, preferably, the step S4 of backfilling layer by layer includes a bottom layer backfilling, a second layer backfilling, a third layer backfilling, and a fourth and above layer backfilling.
In this embodiment, preferably, the specific method for backfilling the bottom layer includes the following steps:
s201, after dredging treatment, filling the lime-stewed sea sand into a clean subgrade bottom layer meeting the backfilling requirement by using an excavator, and performing elevation control in the backfilling process, wherein the number of sections is not less than 3;
s202, controlling the bottom layer backfill loose thickness to be 80cm according to the field condition of the roadbed, if the water level under the roadbed is high and water seepage occurs, increasing the bottom layer fill thickness, but the loose thickness is 81-100cm, and arranging a water collecting well to pump water during backfilling so as to prevent filled sea sand soil from being soaked by water;
s203, backfilling, namely leveling by using an excavator, if ash is added at a place where local ash mixing is not uniform or a place where local soil has a large water content, leveling to a measured thickness by using the excavator, walking for three times on the ash by using the excavator or a large bulldozer crawler, enabling the excavator to walk stably, enabling the surface to basically have no spring, namely meeting the requirement of backfilling the bottom layer, detecting the compactness of the bottom layer after detection to meet the requirement of 87%, enabling the filling width to meet the design requirement, and completely performing secondary soil supplement and slope pasting.
In this embodiment, preferably, the specific method for backfilling the second layer includes the following steps:
s301, after the bottom layer compaction degree is qualified, a filling second layer is arranged, the smoldering soil is filled into the roadbed by an excavator, the filling thickness is controlled by a lofting pier, the filling loose thickness of the second layer is controlled to be 25cm, the compaction coefficient is 1.25, and ash is filled in a place with local uneven ash mixing;
s302, after leveling by using an excavator, rolling by using an excavator crawler belt, enabling the excavator to walk stably, and after four times of rolling, meeting 90% of requirements after compaction degree detection;
and S303, if the on-site roadbed condition permits, the last rolling is recommended to be carried out by adopting a vibratory roller, and the rolling is ensured not to generate a spring.
In this embodiment, preferably, the specific method for backfilling the third layer includes the following steps:
s401, filling a third layer, filling the smoldering soil into a roadbed by using an excavator, and controlling the filling loose paving thickness of the third layer to be 25 cm;
s402, leveling by using an excavator, arranging a cross slope for drainage during leveling, arranging a simple drainage ditch on the outer side, and carrying out static pressure for three times by using a vibratory roller;
and S403, if the tonnage of the compaction degree is smaller, increasing the rolling times, stabilizing the surface after compaction, and completing the one-time filling of the first layer to the third layer on the same day, wherein the compaction degree meets the requirement.
In this embodiment, preferably, the specific method for backfilling at the fourth layer and the above layers includes the following steps:
s501, filling the position above the fourth layer of skin, filling sea sand soil into a roadbed by using an excavator or a soil transport vehicle, and controlling the filling loose paving thickness to be 25 cm;
s502, leveling by a bulldozer, then carrying out static pressure once by a vibratory roller, beating grid soil ash, controlling the paving area of each square of lime to be 40 square meters, and paving ash manually;
s503, turning and stirring by using a furrow plough and a rotary cultivator, wherein the turning and stirring adopts a mode of stirring 4 ploughshares and 6, when the water content is detected to be +/-2% in a laboratory, after the water content is detected to be within the optimal water content, a vibratory roller is used for static time, a grader is used for leveling, after the water content is detected to be static for two times, a three-wheel roller is used for grinding for 2 times, no obvious track mark exists on the surface, and the compactness meets the design requirement;
s504, if the air temperature is high during construction, the water content of the lime soil is strictly controlled during inkstone pressing, and when the water content is low, water drying treatment is carried out.
In this embodiment, it is preferable that the method further includes: protecting along-river grout and building blocks: when the roadbed is easily soaked by water, the protection along the river side slope is immediately carried out, the mortar sheet adopts a covered edge form, the lower part of the foundation extends to form a silt bottom, and the upper part of the foundation is provided with a platform.
The principle and the advantages of the invention are as follows: the invention adopts solidified sea sand soil, can obtain local materials, has low transportation cost, reduces the construction cost, simultaneously can protect cultivated land, reduces the environmental damage, has small sea sand soil particles, can complete the stirring process without needing to be equipped with enough stirring machines on the spot, has small stirring times, can save the construction stirring time, and can ensure normal soil transportation and leveling construction after raining because the sea sand soil has good water seepage performance, the surface can not be muddy after raining, and the construction can be rapidly switched to construction after raining, is basically not restricted by rainy seasons, and has quick construction progress.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A construction method for filling highway subgrade by solidifying sea sand soil is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing soil;
s2, pumping water and dredging;
s3, mixing outside the field;
s4, backfilling layer by layer;
s5, leveling road mixing;
and S6, rolling and forming.
2. The construction method of the solidified sea sand soil for filling the roadbed of the highway according to the claim 1, wherein the construction method comprises the following steps: the specific method for preparing the soil in the S1 comprises the following steps:
s101, after carrying out reclamation on the sea sand soil reserve area, taking the sea sand soil from the beach, transporting the sea sand soil to a construction site for use, detecting the water content through a laboratory, and carrying out in-situ soil reserve on the beach for piling according to the characteristics of the sea sand soil;
s102, performing grid digging and soil preparation according to the working range of the excavator arm, performing soil preparation in a grid-empty grid mode to reduce the water content of the sea sand soil, and detecting the water content of the piled earthwork in a laboratory every day until the water content is reduced to meet the construction requirement;
s103, transporting the sea sand meeting the water content requirement to a soil piling area of a roadbed construction site, carrying out smoldering treatment on the sea sand by using quick lime, detecting that the water content is 3-4% of the optimal water content, and using the sea sand for roadbed backfilling;
and S104, the ash amount of the sea sand soil subjected to ash stewing treatment meets the standard requirement, and the sea sand soil is used for filling after being detected to be qualified.
3. The construction method of the solidified sea sand soil for filling the roadbed of the highway according to the claim 2, wherein: the soil preparation process in the step S1 further comprises the following steps: the earthwork transportation is carried to the site by using a certain number of earthwork transport vehicles, and the number of the earthwork transport vehicles is equipped according to the construction efficiency and the transport distance of the soil loading excavator, so that continuous construction of the roadbed at the construction site is ensured.
4. The construction method of the solidified sea sand soil for filling the roadbed of the highway according to the claim 1, wherein the construction method comprises the following steps: and pumping water and dredging in the S2, and cleaning the substrate by adopting an excavator to remove the silt soft soil foundation.
5. The construction method of the solidified sea sand soil for filling the roadbed of the highway according to the claim 1, wherein the construction method comprises the following steps: and the step-by-step backfilling in the step S4 comprises bottom layer backfilling, second layer backfilling, third layer backfilling and fourth layer and above layer backfilling.
6. The method for constructing a roadbed by solidifying the sea sand soil, according to claim 5, wherein the method comprises the following steps: the specific method for backfilling the bottom layer comprises the following steps:
s201, after dredging treatment, filling the lime-stewed sea sand into a clean subgrade bottom layer meeting the backfilling requirement by using an excavator, and performing elevation control in the backfilling process, wherein the number of sections is not less than 3;
s202, controlling the bottom layer backfill loose thickness to be 80cm according to the field condition of the roadbed, if the water level under the roadbed is high and water seepage occurs, increasing the bottom layer fill thickness, but the loose thickness is 81-100cm, and arranging a water collecting well to pump water during backfilling so as to prevent filled sea sand soil from being soaked by water;
s203, backfilling, namely leveling by using an excavator, if ash is added at a place where local ash mixing is not uniform or a place where local soil has a large water content, leveling to a measured thickness by using the excavator, walking for three times on the ash by using the excavator or a large bulldozer crawler, enabling the excavator to walk stably, enabling the surface to basically have no spring, namely meeting the requirement of backfilling the bottom layer, detecting the compactness of the bottom layer after detection to meet the requirement of 87%, enabling the filling width to meet the design requirement, and completely performing secondary soil supplement and slope pasting.
7. The method for constructing a roadbed by solidifying the sea sand soil, according to claim 5, wherein the method comprises the following steps: the specific method for backfilling the second layer comprises the following steps:
s301, after the bottom layer compaction degree is qualified, a filling second layer is arranged, the smoldering soil is filled into the roadbed by an excavator, the filling thickness is controlled by a lofting pier, the filling loose thickness of the second layer is controlled to be 25cm, the compaction coefficient is 1.25, and ash is filled in a place with local uneven ash mixing;
s302, after leveling by using an excavator, rolling by using an excavator crawler belt, enabling the excavator to walk stably, and after four times of rolling, meeting 90% of requirements after compaction degree detection;
and S303, if the on-site roadbed condition permits, the last rolling is recommended to be carried out by adopting a vibratory roller, and the rolling is ensured not to generate a spring.
8. The method for constructing a roadbed by solidifying the sea sand soil, according to claim 5, wherein the method comprises the following steps: the third-layer backfilling method comprises the following steps:
s401, filling a third layer, filling the smoldering soil into a roadbed by using an excavator, and controlling the filling loose paving thickness of the third layer to be 25 cm;
s402, leveling by using an excavator, arranging a cross slope for drainage during leveling, arranging a simple drainage ditch on the outer side, and carrying out static pressure for three times by using a vibratory roller;
and S403, if the tonnage of the compaction degree is smaller, increasing the rolling times, stabilizing the surface after compaction, and completing the one-time filling of the first layer to the third layer on the same day, wherein the compaction degree meets the requirement.
9. The method for constructing a roadbed by solidifying the sea sand soil, according to claim 5, wherein the method comprises the following steps: the specific method for backfilling the fourth layer and the above layers comprises the following steps:
s501, filling the position above the fourth layer of skin, filling sea sand soil into a roadbed by using an excavator or a soil transport vehicle, and controlling the filling loose paving thickness to be 25 cm;
s502, leveling by a bulldozer, then carrying out static pressure once by a vibratory roller, beating grid soil ash, controlling the paving area of each square of lime to be 40 square meters, and paving ash manually;
s503, turning and stirring by using a furrow plough and a rotary cultivator, wherein the turning and stirring adopts a mode of stirring 4 ploughshares and 6, when the water content is detected to be +/-2% in a laboratory, after the water content is detected to be within the optimal water content, a vibratory roller is used for static time, a grader is used for leveling, after the water content is detected to be static for two times, a three-wheel roller is used for grinding for 2 times, no obvious track mark exists on the surface, and the compactness meets the design requirement;
s504, if the air temperature is high during construction, the water content of the lime soil is strictly controlled during inkstone pressing, and when the water content is low, water drying treatment is carried out.
10. The method of constructing a solidified sea sand soil filled highway subgrade according to claim 1, further comprising: protecting along-river grout and building blocks: when the roadbed is easily soaked by water, the protection along the river side slope is immediately carried out, the mortar sheet adopts a covered edge form, the lower part of the foundation extends to form a silt bottom, and the upper part of the foundation is provided with a platform.
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Application publication date: 20211203 |