CN112095380A - Layered filling method for light combined roadbed at steep slope section - Google Patents
Layered filling method for light combined roadbed at steep slope section Download PDFInfo
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- CN112095380A CN112095380A CN202010791254.5A CN202010791254A CN112095380A CN 112095380 A CN112095380 A CN 112095380A CN 202010791254 A CN202010791254 A CN 202010791254A CN 112095380 A CN112095380 A CN 112095380A
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
- E02D29/0233—Retaining or protecting walls comprising retention means in the backfill the retention means being anchors
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/025—Retaining or protecting walls made up of similar modular elements stacked without mortar
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0084—Geogrids
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2450/00—Gaskets
- E02D2450/10—Membranes
- E02D2450/105—Membranes impermeable
- E02D2450/106—Membranes impermeable for liquids
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a method for hierarchically filling a light combined roadbed in a steep slope section, which comprises the following steps: completing the construction of a concrete foundation of the protective wall on the foundation pit; inserting an anti-skid anchoring part on the steep slope section; building a first protective wall single layer on a protective wall concrete foundation, pouring a first foamed light soil single layer between a steep slope section and the first protective wall single layer to form a first filled roadbed, laying an intermediate geogrid on the surface of the first filled roadbed, repeating the steps until a top filled roadbed is formed, and laying a top geogrid on the surface of the top filled roadbed to form a light combined roadbed; and (4) laying the HDPE impermeable geomembrane on the top geogrid. In the embodiment of the invention, the layered filling method has the advantages of simple structure, convenient construction and high overall stability, can effectively reduce differential settlement, and has good practicability.
Description
Technical Field
The invention relates to the technical field of construction of highways and urban roads, in particular to a layered filling method of a light combined roadbed at a steep slope section.
Background
The construction of the steep slope road section roadbed engineering is always a difficult point of the construction technology, at present, the construction method of the steep slope road section roadbed generally comprises the steps of building a protective wall, pouring a foundation bed between the protective wall and the steep slope road section, connecting the protective wall and the foundation bed as auxiliary supports, and two main conventional methods for building the protective wall are adopted: one is to adopt reinforced concrete to build the protective wall, the other is to adopt concrete prefabricated panels to build the protective wall, the protective wall and the steep slope section are usually poured by adopting foam lightweight soil, and the connection between the protective wall and the foundation bed adopts the combination of upright posts and pull rods as auxiliary supports.
The existing method is adopted to build the roadbed at the steep slope road section, on one hand, the self weight of the protection wall is large, the difference between the building materials of the protection wall and the roadbed is large, the auxiliary support relation between the protection wall and the roadbed is weak, the overall stability of the filled steep slope roadbed is poor, differential settlement is easy to generate, and therefore engineering diseases are caused, and on the other hand, the defects that the construction period is long, the construction period is greatly influenced by the environment, the cost investment is large and the like exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the layered filling method of the light combined roadbed at the steep slope section.
Correspondingly, the embodiment of the invention provides a layered filling method of a light combined roadbed at a steep slope section, which comprises the following steps:
ensuring that a foundation pit is smooth and has no accumulated water, rolling the foundation pit, ensuring the bearing capacity of the foundation pit, and completing construction of a concrete foundation of a protective wall on the foundation pit;
performing surface cleaning treatment on a steep slope section, and inserting an anti-skid anchoring part into the steep slope section;
building a first protective wall single layer on the protective wall concrete foundation, pouring a first foamed light soil single layer between the steep slope section and the first protective wall single layer, wherein the first foamed light soil single layer and the first foamed light soil single layer are the same in height to form a first filled roadbed, laying an intermediate geogrid on the surface of the first filled roadbed, repeating the steps until a top filled roadbed is formed, and laying a top geogrid on the surface of the top filled roadbed to form a light combined roadbed;
and after the lightweight combined roadbed is subjected to moisturizing maintenance, paving an HDPE impermeable geomembrane on the top geogrid.
In an optional embodiment, the anti-skid anchoring elements are inserted into the steep slope section according to a quincunx arrangement rule;
the angle between the anti-skid anchoring piece and the horizontal plane is 45 degrees;
the length of the anti-slide anchoring piece is L, and the depth of the anti-slide anchoring piece inserted into the steep slope section is greater than or equal to L/2.
In an optional implementation mode, the first layer of protective wall single layer is formed by building aerated concrete blocks in a longitudinal staggered stacking mode, the aerated concrete blocks are connected through building mortar, building seams among the aerated concrete blocks are pointing seams, and the seam width of the pointing seams is not more than 1 cm.
In an alternative embodiment, the thickness of the first protective wall single layer is between 0.3 and 1 meter;
pouring a first single layer of foamed lightweight soil between the steep slope section and the first single layer of protective wall, comprising:
dividing a plurality of pouring areas between the steep slope road section and the first layer of protective wall single layer, wherein the area of the pouring areas is less than 400m2The length of the pouring area in the long axis direction is 10-20 meters;
and casting the first foamed lightweight soil single layer in a subarea manner, wherein the thickness of the first foamed lightweight soil single layer is 0.3-1 m.
In an optional embodiment, in the process of separately pouring the first layer of foamed light soil, a settlement joint is arranged every time foamed light soil with a thickness of 10cm to 20cm is poured, wherein the settlement joint is a clamping plate, and the thickness of the clamping plate is 1.5 cm.
In an optional embodiment, in the process of casting the first single layer of foamed lightweight soil in different regions, the foamed lightweight soil is cast from one end to the other end along the long axis direction of the casting area, or the foamed lightweight soil is cast from the two ends to the middle position along the long axis direction of the casting area, or the foamed lightweight soil is cast in the casting area in an opposite angle manner.
In an alternative embodiment, after a first layer of filling subgrade is formed and an intermediate geogrid is laid on the surface of the first layer of filling subgrade, the above steps are repeated after a shortest pouring time interval T, wherein:
when the air temperature in the construction period is not lower than 15 ℃, the shortest pouring time interval T is 8 hours;
when the air temperature in the construction period is lower than 15 ℃, the shortest pouring time interval T is 12 hours.
In an alternative embodiment, the left side of the middle geogrid does not completely cover the first foamed light soil single layer, and the left side of the middle geogrid is anchored on the first foamed light soil single layer by using U-shaped nails; the right side of the middle geogrid is completely covered on the first layer of protective wall single layer, and the right side of the middle geogrid is fixed on the first layer of protective wall single layer through special masonry mortar;
and the top geogrid completely covers and is embedded in the surface of the top filling roadbed.
In an alternative embodiment, the top geogrid is covered with a plastic film, and the lightweight combined roadbed is subjected to moisturizing maintenance for at least 7 days.
In an alternative embodiment, the HDPE impermeable geomembrane is overlapped on the top geogrid by means of heat welding, wherein the thickness of the HDPE impermeable geomembrane is between 0.3mm and 0.6 mm.
The embodiment of the invention provides a layered filling method of a light combined roadbed at a steep slope section, which is adopted, wherein a protective wall is formed by layering and stacking aerated concrete blocks, a foamed light soil foundation bed is formed by layering and zoning pouring foamed light soil, meanwhile, the protective wall and the foamed light soil foundation bed are connected by reinforcing ribs through a middle geogrid and a top geogrid, and an anti-skidding anchoring part is adopted for carrying out steep slope anchoring, so that the problems of poor stability, insufficient strength, easiness in collapse, landslide and uneven settlement of the steep slope roadbed in the prior art are solved, reasonable utilization of resources can be realized, the stability, the overall strength and the durability of the light combined roadbed at the steep slope section are effectively improved, and the convenience and the flexibility of construction are improved; in addition, by adopting the layered filling method, the difference between the materials of the protective wall and the foamed light soil foundation bed is smaller, and the difference settlement of the light combined roadbed can be effectively avoided, so that the stability, the overall strength and the durability of the light combined roadbed are further improved, and the layered filling method has good practicability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a layered filling method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a light combined roadbed at a steep slope section in the embodiment of the invention;
FIG. 3 is a layout view of anti-skid anchors in an embodiment of the present invention;
FIG. 4 is a schematic illustration of the insertion angle of the anti-skid anchor in an embodiment of the present invention;
FIG. 5 is a schematic illustration of the stacking of protective walls in an embodiment of the invention;
fig. 6 is a schematic view of the structure of the geogrid in the embodiment 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.
Fig. 1 is a schematic flow chart of a layered filling method in an embodiment of the invention, and fig. 2 is a schematic structural diagram of a light combined roadbed at a steep slope section in the embodiment of the invention.
The embodiment of the invention provides a method for hierarchically filling a light combined roadbed at a steep slope section, which comprises the following steps:
s11: ensuring that the foundation pit is smooth and has no accumulated water, rolling the foundation pit, ensuring the bearing capacity of the foundation pit, and completing construction of a concrete foundation 2 of the protective wall on the foundation pit;
in the embodiment of the invention, a water pump can be adopted to pump away the accumulated water in the foundation pit, so that the foundation pit is ensured to be free of accumulated water; a grader can be adopted to shape the foundation pit to ensure the leveling of the foundation pit; the foundation pit can be rolled by a road roller, the bearing capacity of the foundation pit is ensured, and the bearing capacity of the foundation pit is required to be not less than 80Kpa according to construction requirements.
In the embodiment of the invention, the construction of the concrete foundation 2 of the protective wall is completed on the foundation pit by adopting a mode of pouring concrete on site, the label of the concrete foundation 2 of the protective wall is required to be larger than C25 according to the construction requirement, and in the specific implementation, the label of the concrete foundation 2 of the protective wall is preferably C30.
S12: the steep slope section 1 is subjected to a surface cleaning treatment, and an anti-skid anchor 6 is inserted on the steep slope section 1.
Fig. 3 is a layout view of the slide resisting anchor in the embodiment of the present invention, and fig. 4 is a schematic view of an insertion angle of the slide resisting anchor in the embodiment of the present invention.
In the embodiment of the present invention, the steep slope section 1 is subjected to a surface cleaning process, that is, the surface of the steep slope section 1 is cleaned.
After the surface of the steep slope road section 1 is cleaned, the anti-slide anchoring parts 6 are inserted into the steep slope road section 1, the anti-slide anchoring parts 6 are members with higher bending strength, such as steel bars, steel pipes, water pipes, I-shaped steel and the like, and the selected materials, specifications, insertion depth and arrangement rules of the anti-slide anchoring parts can be determined according to the actual roadbed construction environment and road requirements.
In the embodiment of the invention, the anti-skid anchoring parts 6 are inserted into the steep slope section 1 according to the quincunx arrangement rule, wherein the anti-skid anchoring parts 6 can be inserted into the steep slope section 1 according to the gradient and actual construction conditions of the steep slope section 1 according to the number of the anti-skid anchoring parts 6 of 1/2 m2To 1 root/4 m2Is arranged.
The angle between the anti-skid anchor 6 and the horizontal plane is 45 degrees.
The length of the anti-slide anchoring piece 6 is L, and the depth of the anti-slide anchoring piece 6 inserted into the steep slope section 1 needs to be greater than or equal to L/2 so as to ensure the stability of the anti-slide anchoring piece 6.
In specific construction, a steel pipe is preferably used as the anti-slide anchoring piece 6, the specification of the steel pipe is D30mm, the length of the steel pipe is 200cm, the steel pipe is inserted into the steep slope section 1 according to a square arrangement rule of 200cm x 200cm, the angle between the steel pipe and the horizontal plane is 45 degrees, and the depth of the steel pipe inserted into the steep slope section 1 needs to be greater than or equal to 100 cm.
S13: building a first protective wall single layer 31 on the protective wall concrete foundation 2, pouring a first foamed light soil single layer 41 between the steep slope road section 1 and the first protective wall single layer 31, wherein the first foamed light soil single layer 31 is as high as the first foamed light soil single layer 41 to form a first filled roadbed, paving an intermediate geogrid 71 on the surface of the first filled roadbed, repeating the steps until a top filled roadbed is formed, and paving a top geogrid 72 on the surface of the top filled roadbed to form the light combined roadbed.
Fig. 5 is a schematic view of the stacking of protective walls in an embodiment of the invention.
In the embodiment of the invention, a first protective wall single layer 31 is built on the protective wall concrete foundation 2.
The first layer of protective wall single layer 31 is formed by building aerated concrete blocks 8 in a longitudinal staggered stacking mode.
It should be noted that, compared with the common bricks, the aerated concrete blocks 8 have the characteristics of light weight and high strength, so that the additional stress of the light combined roadbed can be greatly reduced, and the structural strength of the light combined roadbed is improved.
It should be noted that the first protective wall single layer 31 stacked longitudinally and alternately can achieve higher stability than the parallel stacking method.
Moreover, the aerated concrete blocks 8 are connected by masonry mortar, and the gaps between the adjacent aerated concrete blocks 8 are filled by the masonry mortar, so that the connection between the aerated concrete blocks 8 is firmer, wind and rain can be prevented from invading the wall body, and the wall surface is clean, neat and beautiful; wherein, the masonry mortar should meet the quality requirements of No. M7.5 mortar.
Furthermore, the building seams between the aerated concrete blocks 8 are jointing seams 9, the seam width of the jointing seams 9 is not more than 1cm, the jointing seams 9 can ensure that the building mortar is filled completely, the connection between the aerated concrete blocks 8 is further enhanced, and the wall surface is further clean, neat and attractive.
Preferably, the aerated concrete block 8 is a cuboid, so that the aerated concrete block is convenient to construct, and the length, the width and the height of the aerated concrete block 8 are respectively 60cm x 10cm x 20 cm.
The thickness of the first protection wall single layer 31 is 0.3-1 m, which can be selected according to actual conditions, in particular, in construction, in order to improve construction efficiency, the thickness of the first protection wall single layer 31 is preferably 1m, and the height of the longitudinally stacked 5 aerated concrete blocks 8 is the thickness of the first protection wall single layer 31.
In the embodiment of the invention, a first foamed light soil single layer 41 is poured between the steep slope section 1 and the first protective wall single layer 31, and the first protective wall single layer 31 and the first foamed light soil single layer 41 have the same height, so that a first filled roadbed is formed.
In specific construction, in order to improve the construction efficiency, the first foamed lightweight soil single layer 41 is preferably poured in a partition mode:
firstly, a plurality of casting areas are divided between the steep slope section 1 and the first protective wall single layer 31, wherein the area of the casting areas is less than 400m2And the length of the pouring area in the long axis direction is 10-20 m, so that the pouring efficiency and the pouring effect of the foamed light soil are ensured.
Then, the first foamed lightweight soil single layer 41 is poured in a partitioned manner, the thickness of the first foamed lightweight soil single layer 41 is also 0.3m to 1m, and in specific construction, the thickness of the first foamed lightweight soil single layer 41 is also preferably 1m because the thickness of the first protective wall single layer 31 is preferably 1 m.
In the partition pouring process of the first foamed light soil single layer 41, a settlement joint is arranged every time foamed light soil with the thickness of 10cm to 20cm is poured, the settlement joint can effectively avoid the condition that the first foamed light soil single layer 41 has uneven settlement, in specific construction, the settlement joint adopts a clamping plate, and the thickness of the clamping plate is 1.5 cm.
In the partitioned pouring process of the first foamed light soil single layer 41, if only one pouring pipe is used for pouring, the foamed light soil is poured from one end to the other end along the long axis direction of the pouring area, and if two or more pouring pipes are used for pouring, the foamed light soil can be poured from two ends of the long axis direction of the pouring area to the middle position, or the foamed light soil is poured in the pouring area in a diagonal manner.
In addition, in the partitioned pouring process of the first foamed light soil single layer 41, when the pouring tube needs to be moved, the pouring tube should be moved back and forth along the placing direction of the pouring tube, but the pouring tube should not be moved left and right, and the pouring tube should be moved after being moved out of the foamed light soil.
In addition, in the partitioned pouring process of the first foamed lightweight soil single layer 41, the pouring construction time of each partition should be controlled within two hours, so as to ensure the pouring efficiency and the pouring effect of the foamed lightweight soil.
Fig. 6 is a schematic view of the structure of the geogrid in the embodiment of the present invention.
In the embodiment of the present invention, an intermediate geogrid 71 is laid on the surface of the first-layer roadbed, and the intermediate geogrid 71 serves to join the first foamed lightweight soil single layer 41 and the first protective wall single layer 31.
The left side of the middle geogrid 71 is not completely covered on the first foamed light soil single layer 31, the left side of the middle geogrid 71 is anchored on the first foamed light soil single layer 31 through U-shaped nails, in specific construction, the longitudinal anchoring interval of the U-shaped nails is 2m, the transverse anchoring interval of the U-shaped nails is 1m, the connection effect of the middle geogrid 71 and the first foamed light soil single layer 41 is guaranteed, it needs to be noted that the incomplete covering can also achieve the effect of connecting reinforcement, and materials and cost are also saved; the right side of the middle geogrid 71 completely covers the first protective wall single layer 31, and the right side of the middle geogrid 71 is fixed on the first protective wall single layer 31 through special masonry mortar, so that the connection effect of the middle geogrid 71 and the first protective wall single layer 31 is guaranteed.
In the embodiment of the present invention, after the first layer of filling subgrade is formed and the intermediate geogrid 71 is laid on the first layer of filling subgrade, the above steps are repeated until the shortest pouring time interval T elapses, that is, the filling process of the next layer of filling subgrade is started until the shortest pouring time interval T elapses, wherein the shortest pouring time interval T is determined according to the air temperature in the construction period.
When the air temperature in the construction period is not lower than 15 ℃, the shortest pouring time interval T is 8 hours, namely when the air temperature in the construction period is not lower than 15 ℃, the filling process of the next layer of filling roadbed can be started after at least 8 hours.
When the air temperature in the construction period is lower than 15 ℃, the shortest pouring time interval T is 12 hours, namely when the air temperature in the construction period is lower than 15 ℃, at least 12 hours are needed to start the filling process of the next layer of filling roadbed.
In the embodiment of the invention, after the shortest pouring time interval T, the steps are repeated, namely, a second protective wall single layer is built on the first protective wall single layer 31, a second foamed light soil single layer is poured between the steep slope section 1 and the second protective wall single layer to form a second filled roadbed, an intermediate geogrid 71 is laid on the second filled roadbed, and the steps are repeated until a top filled roadbed is formed, namely, the complete foamed light soil foundation bed 4 and the protective wall 3 are formed zone by zone.
In addition, after the top layer is formed to fill the roadbed, the strength of the foam light soil foundation bed 4 is required to be ensured to reach 0.6Mpa, and other constructions can be carried out.
In the embodiment of the invention, after the top-layer filled roadbed is formed and the strength of the foamed light soil foundation bed 4 reaches 0.6Mpa, the top-layer geogrid 72 is paved on the surface of the top-layer filled roadbed to form the light combined roadbed.
Wherein the top geogrid 72 completely covers and is embedded in the surface of the top roadbed, namely the left side of the top geogrid 72 completely covers and is embedded in the foamed light soil foundation bed 4, the right side of the top geogrid 72 completely covers and is embedded in the protective wall 3, and the top geogrid 72 can play a role in connecting and restraining the foamed light soil foundation bed 4 and the protective wall 3.
It should be noted that both the middle geogrid 71 and the top geogrid 72 can play a role in connecting and restraining the foamed light soil foundation bed 4 and the protective wall 3, so that the connection strength of the foamed light soil foundation bed 4 and the protective wall 3 is improved, the stability, the overall strength and the durability of the light combined roadbed are further improved, and the problems that in the prior art, a steep slope section is poor in structural stability and insufficient in strength, and collapse, landslide and uneven settlement are easy to occur are solved.
Preferably, the middle geogrid 71 and the top geogrid 72 are both of square network structures made of steel and plastic, the tensile force of the steel and plastic grids is borne by high-strength steel wires woven in warp and weft, the steel wire of the longitudinal and transverse ribs of the steel-plastic grating is woven into a net in a warp-weft mode, the outer wrapping layer is formed in one step, the steel wire and the outer wrapping layer can act in a coordinated mode, the breaking elongation is very low (not more than 3%), the main stress units of the steel-plastic grating are steel wires, the creep amount is very low, it can be seen that the square network structure made of steel and plastic has excellent connection strength, the stability, the overall strength and the durability of the light combined roadbed are effectively improved, in the concrete construction, the intermediate geogrid 71 and the top geogrid 72 are both GSZ60-60 type.
S14: and after the lightweight combined roadbed is subjected to moisturizing maintenance, the HDPE impermeable geomembrane 5 is laid on the top geogrid 72.
In the embodiment of the invention, the top geogrid 72 is covered with the plastic film, the light combined roadbed is subjected to moisturizing maintenance for at least 7 days, and after the moisturizing maintenance is carried out for at least 7 days, the plastic film on the top geogrid 72 is removed, so that the plastic film can achieve a relatively ideal moisturizing effect and has the advantages of convenience and quickness in covering and removing.
In the embodiment of the invention, after the light combined roadbed is subjected to moisturizing maintenance, the HDPE impermeable geomembrane 5 is laid on the top geogrid 72, and the HDPE impermeable geomembrane 5 can play a good impermeable effect, so that the stability, the overall strength and the durability of the light combined roadbed are effectively improved.
The HDPE impermeable geomembrane 5 is lapped on the top-layer geogrid 72 in a hot welding mode, the lapping width of the HDPE impermeable geomembrane 5 which is connected with the top-layer geogrid is 5cm, so that the hot welding can be conveniently carried out, and the HDPE impermeable geomembrane 5 should be stretched and tensioned as far as possible when laid, so that the phenomenon that the HDPE impermeable geomembrane 5 is partially rolled up is avoided.
Preferably, the HDPE impermeable geomembrane 5 is a CH-1 type polyethylene geomembrane, the thickness of the HDPE impermeable geomembrane 5 is greater than 0.3mm and less than 0.6mm, it should be noted that if the thickness of the HDPE impermeable geomembrane 5 is less than or equal to 0.3mm, air holes may be generated, which affects the impermeable effect, and if the thickness of the impermeable geomembrane 5 is greater than or equal to 0.6mm, the cost is increased, therefore, in the embodiment of the present invention, the thickness of the HDPE impermeable geomembrane 5 is preferably 0.4mm, which saves the cost while achieving the impermeable effect.
In the embodiment of the invention, the concrete foundation 2 of the protective wall can provide enough bearing capacity for the protective wall 3, so that the stability of the protective wall 3 is ensured, and the stability, the overall strength and the durability of the light combined roadbed are further improved.
In the embodiment of the invention, the protective wall 3 is formed by stacking aerated concrete blocks 8, the foam light soil foundation bed 4 is formed by pouring foam light soil, the difference between the materials of the protective wall 3 and the foam light soil foundation bed 4 is small, and the difference settlement of the light combined roadbed can be effectively avoided, so that the stability, the overall strength and the durability of the light combined roadbed are further improved.
The embodiment of the invention provides a layered filling method of a light combined roadbed at an abrupt slope road section, which is adopted, a protective wall 3 is formed by layering and stacking aerated concrete blocks 8, a foamed light soil foundation bed 4 is formed by layering and casting foamed light soil in different regions, meanwhile, a middle geogrid 71 and a top geogrid 72 are adopted to reinforce and connect the protective wall 3 and the foamed light soil foundation bed 4, and an anti-skid anchoring part 6 is adopted to anchor the abrupt slope, so that the problems of poor stability, insufficient strength, easiness in collapse, landslide and uneven settlement of the abrupt slope roadbed in the prior art are solved, reasonable utilization of resources can be realized, the stability, the overall strength and the durability of the light combined roadbed at the abrupt slope road section are effectively improved, and the convenience and the flexibility of construction are improved; in addition, by adopting the layered filling method, the difference between the materials of the protective wall 3 and the foamed light soil foundation bed 4 is small, and the difference settlement of the light combined roadbed can be effectively avoided, so that the stability, the overall strength and the durability of the light combined roadbed are further improved, and the layered filling method has good practicability.
In addition, the above detailed description is given to the layered filling method for a light combined roadbed at a steep slope section according to the embodiment of the present invention, and a specific example should be adopted herein to explain the principle and the implementation manner of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A layered filling method for a light combined roadbed at a steep slope road section is characterized by comprising the following steps:
ensuring that a foundation pit is smooth and has no accumulated water, rolling the foundation pit, ensuring the bearing capacity of the foundation pit, and completing construction of a concrete foundation of a protective wall on the foundation pit;
performing surface cleaning treatment on a steep slope section, and inserting an anti-skid anchoring part into the steep slope section;
building a first protective wall single layer on the protective wall concrete foundation, pouring a first foamed light soil single layer between the steep slope section and the first protective wall single layer, wherein the first foamed light soil single layer and the first foamed light soil single layer are the same in height to form a first filled roadbed, laying an intermediate geogrid on the surface of the first filled roadbed, repeating the steps until a top filled roadbed is formed, and laying a top geogrid on the surface of the top filled roadbed to form a light combined roadbed;
and after the lightweight combined roadbed is subjected to moisturizing maintenance, paving an HDPE impermeable geomembrane on the top geogrid.
2. The layered filling method according to claim 1, wherein the anti-skid anchors are inserted onto the steep slope sections in a quincunx arrangement;
the angle between the anti-skid anchoring piece and the horizontal plane is 45 degrees;
the length of the anti-slide anchoring piece is L, and the depth of the anti-slide anchoring piece inserted into the steep slope section is greater than or equal to L/2.
3. The layered filling method according to claim 1, wherein the first protective wall single layer is formed by longitudinally and alternately stacking aerated concrete blocks, the aerated concrete blocks are connected by masonry mortar, and building seams among the aerated concrete blocks are pointing seams, and the seam width of the pointing seams is not more than 1 cm.
4. The layered filling method of claim 1, wherein the first protective wall monolayer has a thickness of between 0.3 and 1 meter;
pouring a first single layer of foamed lightweight soil between the steep slope section and the first single layer of protective wall, comprising:
dividing a plurality of pouring areas between the steep slope road section and the first layer of protective wall single layer, wherein the area of the pouring areas is less than 400m2The length of the pouring area in the long axis direction is 10-20 meters;
and casting the first foamed lightweight soil single layer in a subarea manner, wherein the thickness of the first foamed lightweight soil single layer is 0.3-1 m.
5. The layered filling method according to claim 4, wherein in the process of the zonal pouring of the first foamed light soil single layer, a settlement joint is arranged for each poured foamed light soil with the thickness of 10cm to 20cm, wherein the settlement joint adopts a clamping plate, and the thickness of the clamping plate is 1.5 cm.
6. The layered filling method according to claim 4, wherein in the process of the zonal pouring of the first foamed light soil single layer, the foamed light soil is poured from one end to the other end along the long axis direction of the pouring area, or the foamed light soil is poured from both ends to the middle position along the long axis direction of the pouring area, or the foamed light soil is poured in the pouring area in a diagonal manner.
7. The layered filling method according to claim 1, wherein a first filling subgrade is formed, and after an intermediate geogrid is laid on the surface of the first filling subgrade, the steps are repeated until a shortest pouring time interval T elapses, wherein:
when the air temperature in the construction period is not lower than 15 ℃, the shortest pouring time interval T is 8 hours;
when the air temperature in the construction period is lower than 15 ℃, the shortest pouring time interval T is 12 hours.
8. The layered filling method according to claim 1, wherein the left side of the middle geogrid does not completely cover the first single layer of foamed lightweight soil, and the left side of the middle geogrid is anchored to the first single layer of foamed lightweight soil by means of a U-shaped nail; the right side of the middle geogrid is completely covered on the first layer of protective wall single layer, and the right side of the middle geogrid is fixed on the first layer of protective wall single layer through special masonry mortar;
and the top geogrid completely covers and is embedded in the surface of the top filling roadbed.
9. The layered filling method according to claim 1, wherein the top geogrid is covered with a plastic film, and the lightweight combined roadbed is subjected to moisturizing maintenance for at least 7 days.
10. The layered filling method according to claim 1, wherein the HDPE impermeable geomembrane is heat welded to the top geogrid, wherein the HDPE impermeable geomembrane has a thickness between 0.3mm and 0.6 mm.
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Application publication date: 20201218 |