CN112832094A - Construction method for filling intercommunicating ramp by using foam light soil - Google Patents
Construction method for filling intercommunicating ramp by using foam light soil Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 119
- 239000006260 foam Substances 0.000 title claims abstract description 59
- 238000010276 construction Methods 0.000 title claims abstract description 50
- 238000011049 filling Methods 0.000 title claims abstract description 32
- 239000010410 layer Substances 0.000 claims abstract description 84
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 28
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 28
- 239000004571 lime Substances 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 27
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000011065 in-situ storage Methods 0.000 claims abstract description 4
- 239000002356 single layer Substances 0.000 claims abstract description 4
- 230000001680 brushing effect Effects 0.000 claims abstract 2
- 238000005266 casting Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 27
- 238000005187 foaming Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 17
- 238000002360 preparation method Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 11
- 238000012423 maintenance Methods 0.000 claims description 8
- 238000011282 treatment Methods 0.000 claims description 8
- 239000004088 foaming agent Substances 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 claims description 3
- 238000013012 foaming technology Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000011328 necessary treatment Methods 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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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
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a construction method for filling an intercommunicating ramp by using foamed light soil, which comprises the following steps: 1) preparing cement paste; 2) preparing foam; 3) preparing foamed light soil; 4) preparing a pouring area site; 5) pouring foam light soil in situ, taking the bottommost layer as a poured 1 st layer, and arranging pouring areas every 10-15 m along the longitudinal direction of the roadbed; after the side slope is excavated, sequentially constructing from the bottom layer to the top layer in a layered mode during filling, controlling the single-layer pouring thickness to be 60cm, controlling the top layer to be 0.3-1.0 m according to the designed height pouring thickness, and transversely retracting 90cm when pouring to the upper layer; filling the edge covering lime soil layer by layer from bottom to top according to the super width of 1m, wherein the compactness meets the design requirement, and brushing the edge covering lime soil after the edge covering lime soil is filled to the top elevation; the road bed lime soil filling is carried out after the strength of the foamed light soil meets the requirement, the filling is carried out layer by layer, the compactness meets the design requirement, and the transverse slope and the longitudinal slope of the roadbed are adjusted; 6) and (5) maintaining. The invention can obviously reduce the load of the subgrade base, eliminate the settlement of the subgrade after construction and solve the problems of vehicle bump at the bridge head and the like.
Description
Technical Field
The invention relates to a ramp construction method, in particular to a construction method for filling an intercommunicated ramp by using foamed light soil.
Background
The expressway is used as an important life line in a national transportation network, and is constructed in a steep section with complex working conditions and without leaving a mountain road. At the present stage, the expressway in the steep mountain road and complicated working condition section is usually constructed by adopting a conventional roadbed filling method, and the expressway is generally constructed by adopting a low slope foot to build a large-scale retaining wall and adopting a conventional filling and compacting mode. However, the traditional method has the problems of engineering environment danger, large land acquisition area required by slope putting, large filling volume and easy damage to the current mountain slope environment. In addition, the activities of earth excavation and filling, soil borrowing and abandoning, river channel changing, surface soil cleaning, material mining field exploitation and the like of the project planned during the construction period of the conventional soil roadbed filling method can change the natural water flow form, aggravate the water quality deterioration and directly cause the damage to the natural environment; and the activities of material transportation, loading and unloading, mixing of various mixed materials, soil borrowing and excavation, spoil stacking, earth and stone allocation and transportation and the like can cause dust pollution in a short period. The high-fill roadbed is easy to have large post-construction settlement, causes the defects of bridge head bumping and the like, and the conventional ramp filling adopts conventional materials, so that the problems of inconvenient or unreal rolling of lime soil filling, large pressure on the structure side and the like are easily caused.
Chinese patent application CN 110983892 a discloses a foamed lightweight soil and a pouring construction process thereof, which comprises the following steps: s1, base station establishment: the method comprises the steps of building a cement paste mixing station, S2, preparing a pouring area field, S3, preparing foam light soil, S4, pouring the foam light soil and S5, paving a road surface. S3, the concrete method of the foamed lightweight soil in the step is as follows: mixing cement, mineral powder, coal ash and water in a cement paste mixing station and uniformly stirring to obtain cement paste, conveying the cement paste to a construction site through a conveying pipeline, simultaneously dissolving a foaming agent in the water to form foaming liquid in the construction site, introducing compressed air into the foaming liquid to form foam, and mixing and stirring the cement paste and the foam uniformly to form the foamed lightweight soil. The foamed light soil comprises the following components in parts by weight: cement of 280-320 parts, mineral powder of 400-450 parts, coal ash of 300-350 parts and water of 550-650 parts. However, the technology is suitable for the steep mountain road and the complicated working condition, and cannot be suitable for the construction of the ramp which is required to be normally passed on the existing expressway.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a construction method for filling intercommunicating ramps by using foamed light soil, has higher construction efficiency, and can greatly shorten the construction period of a project.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method for filling an intercommunicating ramp by using foamed light soil comprises the following steps:
1) preparation of cement slurries
2) Foam preparation
3) Preparation of foamed light soil
4) Preparing a pouring area site, and checking a pouring area substrate before pouring construction of the light soil to ensure that the substrate has no impurities or accumulated water; the height and the plane size of the substrate meet the design requirements.
5) Pouring foam light soil in situ, taking the bottommost layer as a poured 1 st layer, and arranging pouring areas every 10-15 m along the longitudinal direction of the roadbed;
after the side slope is excavated, sequentially constructing from the bottom layer to the top layer in a layered mode during filling, controlling the single-layer pouring thickness to be 60cm, controlling the top layer to be 0.3-1.0 m according to the designed height pouring thickness, and transversely retracting 90cm when pouring to the upper layer;
after the foam light soil is integrally poured, construction of edge covering lime soil and road bed lime soil is carried out in time. The edge covering lime soil is filled layer by layer from bottom to top according to the super width of 1m, the compactness meets the design requirement, and after the edge covering lime soil is filled to the top elevation, the edge covering lime soil is brushed to the slope. The road bed lime soil filling is carried out after the strength of the foamed light soil meets the requirement, the filling is carried out layer by layer, the compactness meets the design requirement, and the transverse slope and the longitudinal slope of the roadbed are adjusted;
6) and (5) maintaining.
In the step 1), the cement paste stirring process is actually a mixing reaction process of cement and water, and the cement paste mixing ratio and the stirring time are controlled in the process.
The step 2) of preparing the foam is a process of mixing the foaming liquid and the compressed air: mixing compressed air and foaming liquid in a foaming device, and forming a certain foam flow by taking the conveying power of the foaming liquid and the compressed air as power; the mixing proportion of the link is determined by the foaming multiplying power of the foaming agent or the standard density value of the foam; because the mixed medium is gas-liquid mixed, the control difficulty is higher, the control quality is determined by the foaming technology of an equipment system and the performance of a foaming agent, and the control quality is expressed as whether the prepared foam flow is fine and smooth and the foam density is stable.
The mixing proportion of the foam and the cement paste in the preparation process of the foam light soil in the step 3) is determined by the wet density target value of the light soil or the bubble rate of the light soil; the control of the link is the most difficult link to control because of the three-phase medium of gas, liquid and solid; the control quality is determined by the mixing technology of the equipment system, and is represented by whether the density of the prepared light soil is stable and uniform.
In the step 4), the foamed lightweight soil substrate treatment comprises the following steps: adding 5% of lime by mass, digging 20cm, rolling and compacting, and controlling the compaction degree according to not less than 90%; after the side slope steps are excavated, the slope is protected by spraying foam light soil to prevent rainwater erosion.
In the step 5), the area of a single pouring area is divided according to the capacity of the equipment, the pouring of a single pouring layer in the pouring area can be finished in the initial setting time, and the pouring amount of the single pouring layer is not more than 200m3For the control standard, the maximum casting area should not exceed 400m2。
In the step 5):
(1) the upper and lower adjacent pouring layers in the same section are hardened into a control standard within the pouring interval time of the lower pouring layer, and the time is not less than 6 hours;
(2) each pouring layer is poured within the initial setting time of cement paste, and the pouring time is not more than 3 hours; the interval time from the completion of the preparation of the cement paste to the start of the preparation of the light soil is not more than 3h at most;
(3) pouring from one end to the other end along the long axis direction of the pouring area; if a plurality of pouring pipes are adopted for pouring, pouring can be started from one end side by side, or a diagonal pouring mode is adopted;
(4) in the casting process, when the casting tube needs to be moved, the casting tube is required to move back and forth along the placing direction of the casting tube, and the casting tube is not required to move left and right; if the pouring tube is required to move left and right, the pouring tube is moved after being lifted out of the surface of the currently poured light soil as much as possible;
(5) in the pouring process, the maximum height difference between a discharge port of the pouring tube and the current pouring surface is not more than 2 m;
(6) during the pouring construction process, the walking disturbance in the pouring layer should be reduced as much as possible.
In the step 5), transverse deformation joints are preferably arranged every 10-15 m in the longitudinal direction of the roadbed and are filled with foam plastic plates with the thickness of 1-2 cm; the deformation joint should be combined with the position of the construction joint of the pouring area and staggered in the transition area.
In the step 5), when settlement and cracks occur in the pouring construction process of the cast-in-place foam lightweight soil, necessary treatment should be carried out on the conditions that the settlement is serious and the width of the cracks is large:
(1) for hollow type subsidence, a subsidence area is removed, the treatment depth is the thickness of a pouring layer, and the removed part is subjected to supplementary pouring;
(2) for the integral settlement of the whole pouring layer, when the settlement distance is not more than 5% of the thickness of the pouring layer, no treatment is needed; when the subsidence distance exceeds 5% of the thickness of the casting layer, the casting layer is reworked;
(3) and (4) for the crack with the width not more than 3mm, not processing, otherwise, sealing the crack, and paving a layer of galvanized wire gauze in the range of 1m of the boundary of the whole crack.
In the step 6), after the top surface of the light soil roadbed is poured to a designed elevation, a plastic film is adopted for moisturizing and curing, and the curing time is not less than 7 days; forbidding the construction machinery to walk during maintenance;
when the foam light soil is not poured to the top elevation, the surface of the foam light soil is covered and protected when the next layer of construction cannot be carried out for a long time due to reasons such as severe weather.
The invention has the beneficial effects that:
the invention is mainly applied to the ramp wide-spliced road section with the filling height of more than 4.5m, the roadbed below the bed bottom elevation of the wide-spliced side road is filled with the foam light soil, and the light weight of the foam light soil is utilized, so that the roadbed base load can be obviously reduced, the settlement of the roadbed after construction can be eliminated, and the problems of bridge head bumping and the like can be solved. And the foam light soil is filled relative to the lime soil, so that the construction efficiency is higher. The construction period of the project can be greatly shortened, and valuable time is won for the project. Especially, the foamed light soil has great significance for rapidly finishing the quality guarantee of wide sections under the requirement that the conventional expressway still needs normal traffic. The construction part of the foam lightweight soil is overlapped with part of box culverts and abutment backs of the bridge heads. The uprightness characteristic of the solidified foam light soil is adopted, so that the problems that the conventional lime soil is inconvenient to fill and roll or is unrealistic to roll, the pressure on the structure side is high and the like are solved. And good transition of the connection part of the roadbed and the structure is realized.
Drawings
FIG. 1 is a flow chart of a construction process according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a key ring of the light soil preparation process.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope covered by the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
As shown in fig. 1 and 2, the construction method for filling the intercommunicating ramp with the foamed lightweight soil includes:
1) preparing cement paste, wherein the cement paste stirring process is actually a mixing reaction process of cement and water, and the cement paste mixing ratio and the stirring time are controlled in the process.
2) The foam preparation step is a process of mixing foaming liquid and compressed air: mixing compressed air and foaming liquid in a foaming device, and forming a certain foam flow by taking the conveying power of the foaming liquid and the compressed air as power; the mixing proportion of the link is determined by the foaming multiplying power of the foaming agent or the standard density value of the foam; because the mixed medium is gas-liquid mixed, the control difficulty is higher, the control quality is determined by the foaming technology of an equipment system and the performance of a foaming agent, and the control quality is expressed as whether the prepared foam flow is fine and smooth and the foam density is stable.
3) Preparing foam light soil, wherein the mixing ratio of foam and cement paste in the preparation process of the foam light soil is determined by a wet density target value of the light soil or a bubble rate of the light soil; the control of the link is the most difficult link to control because of the three-phase medium of gas, liquid and solid; the control quality is determined by the mixing technology of the equipment system, and is represented by whether the density of the prepared light soil is stable and uniform.
4) Preparing a pouring area site, and checking a pouring area substrate before pouring construction of the light soil to ensure that the substrate has no impurities or accumulated water; the height and the plane size of the substrate meet the design requirements. The foamed lightweight soil substrate treatment comprises the following steps: adding 5% of lime by mass, digging 20cm, rolling and compacting, and controlling the compaction degree according to not less than 90%; after the side slope steps are excavated, the slope is protected by spraying foam light soil to prevent rainwater erosion.
5) Pouring foam light soil in situ, taking the bottommost layer as a poured 1 st layer, and arranging pouring areas every 10-15 m along the longitudinal direction of the roadbed;
after the side slope is excavated, sequentially constructing from the bottom layer to the top layer in a layered mode during filling, controlling the single-layer pouring thickness to be 60cm, controlling the top layer to be 0.3-1.0 m according to the designed height pouring thickness, and transversely retracting 90cm when pouring to the upper layer;
after the foam light soil is integrally poured, construction of edge covering lime soil and road bed lime soil is carried out in time. The edge covering lime soil is filled layer by layer from bottom to top according to the super width of 1m, the compactness meets the design requirement, and after the edge covering lime soil is filled to the top elevation, the edge covering lime soil is brushed to the slope. The road bed lime soil filling is carried out after the strength of the foamed light soil meets the requirement, the filling is carried out layer by layer, the compactness meets the design requirement, and the transverse slope and the longitudinal slope of the roadbed are adjusted; .
The area of the single pouring area is divided according to the capacity of the equipment, the pouring of the single pouring layer in the pouring area can be finished in the initial setting time, and the pouring amount of the single pouring layer is not more than 200m3For the control standard, the maximum casting area should not exceed 400m2。
Note that:
(1) the upper and lower adjacent pouring layers in the same section are hardened into a control standard within the pouring interval time of the lower pouring layer, and the time is not less than 6 hours;
(2) each pouring layer is poured within the initial setting time of cement paste, and the pouring time is not more than 3 hours; the interval time from the completion of the preparation of the cement paste to the start of the preparation of the light soil is not more than 3h at most;
(3) pouring from one end to the other end along the long axis direction of the pouring area; if a plurality of pouring pipes are adopted for pouring, pouring can be started from one end side by side, or a diagonal pouring mode is adopted;
(4) in the casting process, when the casting tube needs to be moved, the casting tube is required to move back and forth along the placing direction of the casting tube, and the casting tube is not required to move left and right; if the pouring tube is required to move left and right, the pouring tube is moved after being lifted out of the surface of the currently poured light soil as much as possible;
(5) in the pouring process, the maximum height difference between a discharge port of the pouring tube and the current pouring surface is not more than 2 m;
(6) during the pouring construction process, the walking disturbance in the pouring layer should be reduced as much as possible.
Transverse deformation joints are preferably arranged every 10-15 m in the longitudinal direction of the roadbed and are filled with foam plastic plates with the thickness of 1-2 cm; the deformation joint should be combined with the position of the construction joint of the pouring area and staggered in the transition area.
In the pouring construction process of the cast-in-place foam light soil, when subsidence and cracks occur, necessary treatment is carried out on the conditions that the subsidence is serious and the width of the cracks is large:
(1) for hollow type subsidence, a subsidence area is removed, the treatment depth is the thickness of a pouring layer, and the removed part is subjected to supplementary pouring;
(2) for the integral settlement of the whole pouring layer, when the settlement distance is not more than 5% of the thickness of the pouring layer, no treatment is needed; when the subsidence distance exceeds 5% of the thickness of the casting layer, the casting layer is reworked;
(3) and (4) for the crack with the width not more than 3mm, not processing, otherwise, sealing the crack, and paving a layer of galvanized wire gauze in the range of 1m of the boundary of the whole crack.
6) Maintaining, namely after pouring the top surface of the light soil roadbed to a designed elevation, performing moisture preservation and maintenance by adopting a plastic film, wherein the maintenance time is not less than 7 days; forbidding the construction machinery to walk during maintenance;
when the foam light soil is not poured to the top elevation, the surface of the foam light soil is covered and protected when the next layer of construction cannot be carried out for a long time due to reasons such as severe weather.
Before the road bed construction, the construction can be carried out after the light soil roadbed meets the design strength requirement. When the road bed is constructed, large-scale machines such as a dump truck, a road roller, a bulldozer and the like are strictly forbidden to directly walk on the top surface of the light soil roadbed, and the paving and the rolling are carried out in an advancing mode of unloading, leveling and rolling at the same time, namely, the unloading truck and the road roller are required to unload and walk at the rear end of the leveling machine.
In rainy season construction, temporary drainage prevention measures are specially made, water and soil loss of an excavated section and an adjacent non-excavated section is mainly prevented, and the slope surface is prevented from being washed away by adopting related measures of covering a film and arranging a temporary drainage ditch, so that a large amount of water and soil is prevented from flowing to a low light soil pouring surface to pollute the light soil.
Construction in rainy days should be avoided according to weather forecast; once the casting is started and the rain is in the case, the casting is stopped immediately and emergency measures such as rain shielding and the like are adopted for protection; when the construction is continued, the surface of the poured foam light soil is checked, and the defoaming conveying layer is removed when the surface is found.
Test detection after curing
1. The compressive strength is detected as an index in a conventional test after the foamed lightweight soil is cured.
2. When the foam light soil roadbed is poured to the last 1 layer, 3 groups of strength detection test pieces are taken from each pouring layer of each section, strength detection in the age period of 7 days and 28 days is respectively carried out on the test pieces, and the test pieces are sealed by plastic bags and placed on the site for curing under the same conditions; and (3) taking 1 group of strength detection test pieces for each pouring layer of the foamed light soil at other layers, performing 28-day age strength detection, sealing the test pieces by adopting plastic bags in a single piece, and maintaining in a 20-25 ℃ maintenance environment.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A construction method for filling an intercommunicating ramp by using foam light soil is characterized by comprising the following steps:
1) preparation of cement slurries
2) Foam preparation
3) Preparation of foamed light soil
4) Preparing a pouring area site, and checking a pouring area substrate before pouring construction of the light soil to ensure that the substrate has no impurities or accumulated water; the height and the plane size of the substrate meet the design requirements;
5) pouring foam light soil in situ, taking the bottommost layer as a poured 1 st layer, and arranging pouring areas every 10-15 m along the longitudinal direction of the roadbed;
after the side slope is excavated, sequentially constructing from the bottom layer to the top layer in a layered mode during filling, controlling the single-layer pouring thickness to be 60cm, controlling the top layer to be 0.3-1.0 m according to the designed height pouring thickness, and transversely retracting 90cm when pouring to the upper layer;
after the foam light soil is integrally poured, construction of edge covering lime soil and road bed lime soil is carried out in time; filling the edge covering lime soil layer by layer from bottom to top according to the super width of 1m, wherein the compactness meets the design requirement, and brushing the edge covering lime soil after the edge covering lime soil is filled to the top elevation; the road bed lime soil filling is carried out after the strength of the foamed light soil meets the requirement, the filling is carried out layer by layer, the compactness meets the design requirement, and the transverse slope and the longitudinal slope of the roadbed are adjusted;
6) and (5) maintaining.
2. The method as claimed in claim 1, wherein the step 1) is a step of mixing cement with water, and the mixing ratio and mixing time are controlled.
3. The method for constructing an intercommunicating ramp filled with foamed lightweight soil according to claim 1, wherein the step 2) is a process of mixing a foaming liquid with compressed air: mixing compressed air and foaming liquid in a foaming device, and forming a certain foam flow by taking the conveying power of the foaming liquid and the compressed air as power; the mixing proportion of the link is determined by the foaming multiplying power of the foaming agent or the standard density value of the foam; because the mixed medium is gas-liquid mixed, the control difficulty is higher, the control quality is determined by the foaming technology of an equipment system and the performance of a foaming agent, and the control quality is expressed as whether the prepared foam flow is fine and smooth and the foam density is stable.
4. The method as claimed in claim 1, wherein the mixing ratio of the foam and the cement slurry in the preparation process of the foam light soil in the step 3) is determined by a wet density target value of the light soil or a bubble rate of the light soil; the control of the link is the most difficult link to control because of the three-phase medium of gas, liquid and solid; the control quality is determined by the mixing technology of the equipment system, and is represented by whether the density of the prepared light soil is stable and uniform.
5. The method for constructing an intercommunicating ramp using foamed lightweight soil according to claim 1, wherein in the step 4), the foamed lightweight soil base is treated as follows: adding 5% of lime by mass, digging 20cm, rolling and compacting, and controlling the compaction degree according to not less than 90%; after the side slope steps are excavated, the slope is protected by spraying foam light soil to prevent rainwater erosion.
6. The method according to claim 1, wherein in the step 5), the area of the single casting area is divided according to the capacity of the equipment, so that the single casting layer in the casting area can be cast within the initial setting time and the casting volume of the single casting layer is not more than 200m3For the control standard, the maximum casting area should not exceed 400m2。
7. The construction method for filling an intercommunicating ramp with foamed lightweight soil according to claim 1, wherein in the step 5):
(1) the upper and lower adjacent pouring layers in the same section are hardened into a control standard within the pouring interval time of the lower pouring layer, and the time is not less than 6 hours;
(2) each pouring layer is poured within the initial setting time of cement paste, and the pouring time is not more than 3 hours; the interval time from the completion of the preparation of the cement paste to the start of the preparation of the light soil is not more than 3h at most;
(3) pouring from one end to the other end along the long axis direction of the pouring area; if a plurality of pouring pipes are adopted for pouring, pouring can be started from one end side by side, or a diagonal pouring mode is adopted;
(4) in the casting process, when the casting tube needs to be moved, the casting tube is required to move back and forth along the placing direction of the casting tube, and the casting tube is not required to move left and right; if the pouring tube is required to move left and right, the pouring tube is moved after being lifted out of the surface of the currently poured light soil as much as possible;
(5) in the pouring process, the maximum height difference between a discharge port of the pouring tube and the current pouring surface is not more than 2 m;
(6) during the pouring construction process, the walking disturbance in the pouring layer should be reduced as much as possible.
8. The construction method for filling and constructing intercommunicating ramps by using foamed light soil according to claim 1, wherein in the step 5), transverse deformation joints are preferably arranged every 10-15 m in the longitudinal direction of the roadbed and are filled by using foamed plastic plates with the thickness of 1-2 cm; the deformation joint should be combined with the position of the construction joint of the pouring area and staggered in the transition area.
9. The method as claimed in claim 1, wherein in step 5), when the settlement and crack occur during the pouring process of the cast-in-place foam light soil, the necessary treatment is performed for the case of serious settlement and large crack width:
(1) for hollow type subsidence, a subsidence area is removed, the treatment depth is the thickness of a pouring layer, and the removed part is subjected to supplementary pouring;
(2) for the integral settlement of the whole pouring layer, when the settlement distance is not more than 5% of the thickness of the pouring layer, no treatment is needed; when the subsidence distance exceeds 5% of the thickness of the casting layer, the casting layer is reworked;
(3) and (4) for the crack with the width not more than 3mm, not processing, otherwise, sealing the crack, and paving a layer of galvanized wire gauze in the range of 1m of the boundary of the whole crack.
10. The method as claimed in claim 1, wherein in step 6), after the top surface of the light soil roadbed is poured to a designed height, the top surface of the light soil roadbed is subjected to moisture preservation and maintenance by using a plastic film, and the maintenance time is not less than 7 days; forbidding the construction machinery to walk during maintenance;
when the foam light soil is not poured to the top elevation, the surface of the foam light soil is covered and protected when the next layer of construction cannot be carried out for a long time due to reasons such as severe weather.
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