CN103628375A - Rock salt roadbed construction method - Google Patents
Rock salt roadbed construction method Download PDFInfo
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- CN103628375A CN103628375A CN201210303765.3A CN201210303765A CN103628375A CN 103628375 A CN103628375 A CN 103628375A CN 201210303765 A CN201210303765 A CN 201210303765A CN 103628375 A CN103628375 A CN 103628375A
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- rock salt
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Abstract
The invention relates to a rock salt roadbed construction method in a salty soil area. The method comprises the following steps: 1, laying lines before construction; 2, selecting proper rock salt, wherein the total amount of soluble salt in the rock salt is not less than 40%, and the ratio of chlorine ion to sulfate ion (Cl<->/SO4<2->) is in a range of 3.0 to 25.5; 3, digging rock salt and paving the rock salt; 4, grinding the rock salt, paving rock salt on the ground by using a bulldozer, continuously driving the bulldozer back and forth on the rock salt to crush the rock salt blocks, then fiercely vibrating and rolling so as to pulverize the rock salt by using a pulling type sheep-horn roller which is pulled by the bulldozer, then racking over the rock salt by using a land leveler, and fiercely vibrating and rolling to pulverize the rock salt again by using the pulling type sheep-horn roller; 5, spraying brine; 6, trimming the roadbed, rolling the roadbed with a smooth wheel vibration roller, spraying a little amount of brine on the surface of the roadbed after the compactness detection, carrying out a weak vibration treatment for a time so as to shine the surface; 7, maintaining the surface with brine, and examining the quality. The operation in the construction process of the construction method is simple; the construction method solves the problem of shortage of construction materials in salty soil areas at the same time, reasonably utilizes the local materials and resources, has a prominent effect on reducing construction cost and energy consumption, and is suitable for being applied to basic construction of building projects such as road construction, railway construction, and the like, in salty soil areas.
Description
Technical field
The present invention relates to a kind of roadbed construction method, relate in particular to a kind of rock salt roadbed construction method crossing saline soil area.
Background technology
Constantly perfect along with highway construction technology, the road materialss such as loess, grit soil are used widely in subgrade construction, and roadbed earthwork construction, as the modal construction technology of highway engineering, is grasped by Road Construction Enterprises already.At present, roadbed filling in Construction of roadway is mainly loess, flyash, drift-sand, grit soil and water, and in Xinjiang, be called the Lop Nur of dead sea, life forbidden zone from ancient times, be located in playa region of no relief, Lop Nur, water resource along the line lacks, dry, earth's surface soil property was categorized as saline soil area by salt amount completely, common road materials scarcity of resources, use cost is high, and difficulty of construction is large.And in saline soil area, adopt conventional road materials to be prone to the roadbed harm such as salt rises, differential settlement, maintenance cost is high.
Technical method of the present invention has no relevant report.
Summary of the invention
The object of the invention is to propose a kind of gathering materials on the spot, in saline soil area, reduce difficulty of construction, strengthen the rock salt roadbed construction method of subgrade strength and stability.
The technical solution adopted in the present invention is: rock salt roadbed construction method comprises taking of the choosing of unwrapping wire before construction, rock salt, rock salt and laying, the fragmentation of rock salt, the sprinkling of bittern, roadbed leveling and rolls and bittern health and quality examination:
(1) unwrapping wire before construction: emit route midline position, calculate position, sideline according to design width according to subgrade construction design drawing coordinate;
(2) choosing of rock salt: the lyotropic salt total amount of the rock salt of selecting is not less than 40%, and the chlorion in lyotropic salt and sulfate ion (Cl
-/ SO
4 2-) ratio in 3.0-25.5;
(3) the taking and lay of rock salt: by the rock salt requirement described in step 2, at rock salt, meet the demands and minable appointment stock ground, with excavator, remove after table soil, take applicable rock salt, by haulage vehicle, be transported to the scene of filling, the engineering quantity of calculating according to filling-up thickness is carried out discharging, according to loose laying depth, rock salt is evenly spread out, to carry out fragmentation, rolling operation with loader or bulldozer simultaneously;
(4) fragmentation of rock salt: use bulldozer that rock salt heap is laid in to earth's surface, constantly come and go in driving process at bulldozer, utilize the deadweight of bulldozer and rolling of crawler belt, large volume rock salt piece is crushed to small size rock salt piece.With bulldozer traction, drag formula spiky roller to shake by force more subsequently and roll fragmentation, then use land leveller to blow over along land leveller direction of advance from midline position to position, sideline, then shake by force and roll fragmentation with the formula spiky roller of dragging;
(5) sprinkling of bittern: spray the method that saturated bittern adopts the profit while spilling, after first pass saturated bittern sprays, when rock salt surface does not have obvious water mark, then carry out the sprinkling of second, third time.Consider evaporation capacity, water supply volume is by being greater than optimum moisture content 2% with interior control, and the compacted depth of take is no more than 20cm as degree, has spilt stewing material after saturated bittern, treats that moisture content fully permeates whole filler, i.e. rock salt.When water content is excessive, suitably airing, if any the section of lack of water, can mend and spill saturated bittern;
(6) roadbed flattens and rolls: adopt halo vibratory roller to roll, middle behind first both sides while rolling, the halo vibratory roller maximal rate of travelling is no more than 3km/h, the mode of rolling a little less than being, shake one time, Qiang Zhensan all over, shake one time a little less than again, within compacted depth is controlled at 20cm, after compacting degree detects, at a small amount of bittern of surface sprinkling, with weak shaking, receive optical surface one time, a small amount of bittern refers to and can make earth's surface infiltrate, and the bittern consumption while there is not free-pouring state;
(7) bittern health and quality examination: in the roadbed health stage, continue to spray saturated bittern by the optimum moisture content in step 5, after treating the health stage, can carry out quality examination.
Owing to adopting technique scheme, work progress of the present invention is simple to operate, solved the problem of saline soil area construction material scarcity simultaneously, gather materials on the spot resource is received rational application, the successful Application of rock salt Roadbed Construction Technology, break through the routine techniques means of roadbed, cracked a difficult problem for the regional workmanship common faults such as the feeding existing in the construction of rock salt area is difficult, water is difficult to and salt rises.Suit measures to local conditions, gather materials on the spot and guarantee workmanship on the one hand, rationally utilize abundant region resource.Reducing construction cost, the aspect such as energy-saving and cost-reducing obtains remarkable result.The civil works foundation constructions such as the present invention is applicable to by force, the highway of mistake saline soil area, railway.
The specific embodiment
Embodiment: the present invention includes following steps: the taking and laying, the fragmentation of rock salt, the sprinkling of bittern, roadbed leveling and roll and bittern health and quality examination of the choosing of the unwrapping wire before construction, rock salt, rock salt.
1, unwrapping wire before construction: emit route midline position, calculate position, sideline according to design width according to subgrade construction design drawing coordinate.
2, choosing of rock salt: the lyotropic salt total amount of the rock salt of selecting is not less than 40%, and the chlorion in lyotropic salt and sulfate ion (Cl
-/ SO
4 2-) ratio in 3.0-25.5.The moisturizing of rock salt outer wrapping damp course, in moisturizing layer, temperature is 20 ℃, the health seven days of not soaking in the isoperibol that relative air humidity is 60%-70%.When being not less than 0.5MPa, unconfined compression strength under 95% degree of compaction condition can use.
Unconfined compression strength refers to that the soil body resists the ultimate strength of axial compression under without side limit condition.
Its chemical composition of described rock salt is NaCl, and crystal all belongs to the halide of isometric system hexakisoctahedral class.The generation type of rock salt is mainly mineralized groundwater and forms salinized soil and earth's surface mineralising runoff formation salinized soil, and, due to strong evaporation from land effect, salt lake surface water is evaporated, and entrained salt is gathered in earth's surface or underground not dark position.Its soil property and hard, for khaki is the salt shell of ridge shape or annular distribution.
Described lyotropic salt mainly refers to strong acid, highly basic, solubility >=10%, the salt of the metal that some are active (as Ka, Na etc.) or with the salt of Cl ion, acid group is that the salt of the salt (except Ba ion) of SO4 is referred to as lyotropic salt.
3, the taking and lay of rock salt: by the rock salt requirement described in step 2, at rock salt, meet the demands and minable appointment stock ground, with excavator, remove after table soil, take applicable rock salt, by haulage vehicle, be transported to the scene of filling, the engineering quantity of calculating according to filling-up thickness is carried out discharging, according to loose laying depth, rock salt is evenly spread out, to carry out fragmentation, rolling operation with loader or bulldozer simultaneously.Loose laying depth is pressed content provided in < < highway road surface construction technique normalizing > > and is calculated gained.
4, the fragmentation of rock salt: use bulldozer that rock salt heap is laid in to earth's surface, constantly come and go in driving process at bulldozer, utilize the deadweight of bulldozer and rolling of crawler belt, large volume rock salt piece is crushed to small size rock salt piece.With bulldozer traction, drag formula spiky roller to shake by force more subsequently and roll fragmentation, the overlapping 30cm that is no less than of wheelmark.Along land leveller direction of advance from midline position to position, sideline, use land leveller to blow over 5-8cm thickness again.With the formula spiky roller of dragging, shake by force and roll fragmentation again, until rock salt piece is all crushed to particle diameter content≤5% of 10-15cm, content >=95% below 10cm, while being no more than 25cm with loose laying depth, crushes broken best results.Now coefficient of loose laying is controlled by 1.19.
Guarantee every layer of surfacing of rock salt roadbed, need every layer of surface more than 95% rock salt piece to be crushed to 5-8cm.
5, the sprinkling of bittern: spray the method that saturated bittern adopts the profit while spilling, after first pass saturated bittern sprays, when rock salt surface does not have obvious water mark, then carry out the sprinkling of second, third time.Consider evaporation capacity, water supply volume is by being greater than optimum moisture content 2% with interior control.Described optimum moisture content refers to that water content measured when the filler that bankets reaches maximum dry density is optimum moisture content, and its numerical value is obtained by compaction test.From wetting effect, with compacted depth, be no more than 20cm effect best.After having spilt saturated bittern, boil in a covered pot over a slow fire material, treat that moisture content fully permeates whole filler, i.e. rock salt.When water content is excessive, suitably airing, if any the section of lack of water, can appropriate supplement spill saturated bittern.
The generation type of saturated bittern: bittern on earth's surface, assemble after under high light and high temperature irradiate, concentration progressively improves, in the concentration of bittern, reaching 40% can be so that be used on roadbed the total salinity >300g/L of saturated bittern.
Compaction test is to understand a kind of method of soil compaction characteristic with hammer compacted soil samples.This method is to distinguish the soil sample of hammering different moisture content by the different real merits (hammer weigh * fall distance * hammer number) of hitting, and measures corresponding dry density, thereby tries to achieve maximum dry unit weight, optimum water content, for the design of fill construction, constructing provides foundation.Compaction test can divide two kinds of typical compacting method and individual layer compacting process.
6, roadbed leveling and rolling: after checking that water content is suitable, just can roll, water content is suitable refers to bittern in step 5.Adopt halo vibratory roller to roll, while rolling behind first both sides in the middle of, the halo vibratory roller maximal rate of travelling is no more than 3km/h, the mode of rolling a little less than being, shake one time, Qiang Zhensan all over, shake one time a little less than again, within compacted depth is controlled at 20cm.Compacting degree at a small amount of bittern of surface sprinkling, is received optical surface one time with weak shaking after detecting.A small amount of bittern refers to and can make earth's surface infiltrate, and the bittern consumption while there is not free-pouring state.
7, bittern health and quality examination: in the roadbed health stage, continue to spray saturated bittern by the optimum moisture content in step 5.After treating the health stage, can carry out quality examination.
Rock salt roadbed under the reasonable control of rock salt and saturated bittern, improving aspect subgrade strength and stability effect remarkable, its physical and mechanical property technical indicator meets the requirement of highway engineering quality acceptance criteria.
Through cross the test of salinized soil rock salt section in playa district, Lop Nur, utilize abundant rock salt material along the line as filling roadbed, underground saturated bittern is as construction water, spill paving brine delamination and roll formation subgrade and pavement, only with subgrade construction construction cost, compare, the stone embankment unit price of borrowing of rock salt roadbed is 50 yuan/m
3, as adopt natural gravel roadbed, and its comprehensive haul distance is more than 95 kilometers, and its debit's unit price is 100 yuan/m
3.Therefore the present invention selects, transports filling material, the aspects such as construction cost all have great advantage, are applicable to the civil works foundation constructions such as strong, to cross saline soil area highway, railway.
Claims (6)
1. a rock salt roadbed construction method, is characterized in that: comprise the following steps: the taking and laying, the fragmentation of rock salt, the sprinkling of bittern, roadbed leveling and roll and bittern health and quality examination of the choosing of the unwrapping wire before construction, rock salt, rock salt:
(1) unwrapping wire before construction: emit route midline position, calculate position, sideline according to design width according to subgrade construction design drawing coordinate;
(2) choosing of rock salt: the lyotropic salt total amount of the rock salt of selecting is not less than 40%, and the chlorion in lyotropic salt and sulfate ion (Cl
-/ SO
4 2-) ratio in 3.0-25.5;
(3) the taking and lay of rock salt: by the rock salt requirement described in step 2, at rock salt, meet the demands and minable appointment stock ground, with excavator, remove after table soil, take applicable rock salt, by haulage vehicle, be transported to the scene of filling, the engineering quantity of calculating according to filling-up thickness is carried out discharging, according to loose laying depth, rock salt is evenly spread out, to carry out fragmentation, rolling operation with loader or bulldozer simultaneously;
(4) fragmentation of rock salt: use bulldozer that rock salt heap is laid in to earth's surface, at bulldozer, constantly come and go in driving process, utilize the deadweight of bulldozer and rolling of crawler belt, rock salt piece is crushed, with bulldozer traction, drag formula spiky roller to shake by force more subsequently and roll fragmentation, along land leveller direction of advance from midline position to position, sideline, use land leveller to blow over again, then shake by force and roll fragmentation with the formula spiky roller of dragging;
(5) sprinkling of bittern: spray the method that saturated bittern adopts the profit while spilling, after first pass saturated bittern sprays, when rock salt surface does not have obvious water mark, carry out again the sprinkling of second, third time, water supply volume is by being greater than optimum moisture content 2% with interior control, and the compacted depth of take is no more than 20cm as degree, has spilt stewing material after saturated bittern, treat that moisture content fully permeates whole filler, be rock salt, when water content is excessive, suitably airing, if any the section of lack of water, can mend and spill saturated bittern;
(6) roadbed flattens and rolls: adopt halo vibratory roller to roll, middle behind first both sides while rolling, the halo vibratory roller maximal rate of travelling is no more than 3km/h, the mode of rolling a little less than being, shake one time, Qiang Zhensan all over, shake one time a little less than again, within compacted depth is controlled at 20cm, after compacting degree detects, at a small amount of bittern of surface sprinkling, with weak shaking, receive optical surface one time, a small amount of bittern refers to and can make earth's surface infiltrate, and the bittern consumption while there is not free-pouring state;
(7) bittern health and quality examination: in the roadbed health stage, continue to spray saturated bittern by the optimum moisture content in step 5, after treating the health stage, can carry out quality examination.
2. rock salt roadbed construction method as claimed in claim 1, it is characterized in that: the rock salt outer wrapping damp course moisturizing of selecting, in moisturizing layer, temperature is 20 ℃, relative air humidity is the health seven days of not soaking in 60%-70% isoperibol, until it meets unconfined compression strength under 95% degree of compaction condition, is not less than 0.5MPa.
3. a kind of rock salt roadbed construction method as claimed in claim 1, is characterized in that: the overlapping 30cm of being no less than of wheelmark while dragging formula spiky roller to shake by force to roll fragmentation with bulldozer traction.
4. a kind of rock salt roadbed construction method as claimed in claim 1, is characterized in that: it is 5-8cm that land leveller blows over thickness.
5. a kind of rock salt roadbed construction method as claimed in claim 1, it is characterized in that: the formula spiky roller of dragging shakes by force and while rolling fragmentation, rock salt piece is all crushed to particle diameter content≤5% of 10-15cm, content >=95% below 10cm, the loose laying depth of take is no more than 25cm as degree.
6. a kind of rock salt roadbed construction method as claimed in claim 5, is characterized in that: the more than 95% rock salt piece in every layer of rock salt surface is crushed to 5-8cm.
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Cited By (6)
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| CN107938454A (en) * | 2016-10-12 | 2018-04-20 | 新疆铁道勘察设计院有限公司 | Utilize the filling roadbed method of rock salt |
| CN109137692A (en) * | 2017-06-13 | 2019-01-04 | 新疆北方建设集团有限公司 | A kind of gobi roadbed salt marsh chemical treatment construction |
| CN109736175A (en) * | 2018-12-25 | 2019-05-10 | 青海盐湖工业股份有限公司 | A kind of factories and miness rock salt road and its construction method |
| CN112160221A (en) * | 2020-09-17 | 2021-01-01 | 青海省能源发展（集团）有限责任公司 | Method for hardening pavement of transportation road in mining area by using brine |
| CN113277812A (en) * | 2021-05-06 | 2021-08-20 | 新疆维吾尔自治区交通规划勘察设计研究院 | Rock salt base layer mixture, preparation method and application |
| CN114108407A (en) * | 2021-12-09 | 2022-03-01 | 中铁十局集团第七工程有限公司 | Construction method of strong-alkali saline soil subgrade in plateau cold and arid region |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107938454A (en) * | 2016-10-12 | 2018-04-20 | 新疆铁道勘察设计院有限公司 | Utilize the filling roadbed method of rock salt |
| CN109137692A (en) * | 2017-06-13 | 2019-01-04 | 新疆北方建设集团有限公司 | A kind of gobi roadbed salt marsh chemical treatment construction |
| CN109736175A (en) * | 2018-12-25 | 2019-05-10 | 青海盐湖工业股份有限公司 | A kind of factories and miness rock salt road and its construction method |
| CN112160221A (en) * | 2020-09-17 | 2021-01-01 | 青海省能源发展（集团）有限责任公司 | Method for hardening pavement of transportation road in mining area by using brine |
| CN113277812A (en) * | 2021-05-06 | 2021-08-20 | 新疆维吾尔自治区交通规划勘察设计研究院 | Rock salt base layer mixture, preparation method and application |
| CN114108407A (en) * | 2021-12-09 | 2022-03-01 | 中铁十局集团第七工程有限公司 | Construction method of strong-alkali saline soil subgrade in plateau cold and arid region |
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Application publication date: 20140312 |