CN112813757B - Foam light soil composite roadbed construction method for bridge head transition treatment - Google Patents
Foam light soil composite roadbed construction method for bridge head transition treatment Download PDFInfo
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- CN112813757B CN112813757B CN202011621343.1A CN202011621343A CN112813757B CN 112813757 B CN112813757 B CN 112813757B CN 202011621343 A CN202011621343 A CN 202011621343A CN 112813757 B CN112813757 B CN 112813757B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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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
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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Abstract
The invention discloses a construction method of a foam light soil composite roadbed for bridge head transition treatment, which comprises the steps of paving a cushion layer; pouring a protective wall foundation, building a first light protective wall single layer, and arranging a partition pouring template; a first layer of foam light soil single layer is poured on the cushion layer in a partition mode to form a first layer of foam light soil filling body, and a reinforcement structure is laid on the first layer of foam light soil filling body; and building a second lightweight protective wall single layer, pouring a second layer of foamed lightweight soil single layer to form a second layer of foamed lightweight soil filling body, laying a reinforcement structure on the second layer of foamed lightweight soil filling body, and circulating until a top layer of foamed lightweight soil filling body is formed. In the embodiment of the invention, the construction method of the foamed lightweight soil composite roadbed can solve the problems of insufficient overall stability, easy weathering, unattractive appearance, high cost and long construction period in the conventional bridge transition section construction method.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a construction method of a foam light soil composite roadbed for bridge head transition treatment.
Background
The principle of the bump at the bridge head is that the road surface has different settlement fractures at the back filling positions of the abutment, so that the vehicle jumps and impacts when passing, thereby causing additional impact load to the bridge culvert and the road surface, causing drivers and passengers to feel uncomfortable and even causing the vehicle to decelerate greatly, and causing serious traffic accidents (particularly mechanical accidents of the vehicle); therefore, the problem of the bump at the bridge head becomes an important influence factor of the engineering quality and the construction cost of a high-grade road, the problem of the bump at the bridge head is solved, and the problem is an important task of a municipal facility management department.
The construction at the bridge transition section is mainly to avoid the settlement problem among different structures, and the existing bridge transition section construction method utilizes earthwork or foam light soil to fill the bridge transition section:
utilize the earthwork to fill bridge changeover portion, subside after the earthwork is backfilled greatly, the bridge floor of long-time earthwork backfill can form the concave surface, can form the jump car when the vehicle goes, and the construction speed is slow moreover, and the cycle length is long, consumes a large amount of manpower and materials simultaneously.
The foam light soil is utilized without being matched with a connecting reinforced material to fill the bridge transition section, so that the additional stress cannot be effectively dispersed due to the loss of the lateral constraint effect, the deformation of the embankment is difficult to control, and the cost is greatly improved; moreover, when the foam light soil is poured, the construction characteristics of partitioned layered filling are adopted, and more construction templates are adopted, so that a large amount of manpower and material resources are consumed; in addition, after the foam light soil is poured, the outer surface of the foam light soil is exposed in the air, so that the engineering attractiveness is influenced, and the exposed part of the foam light soil is easy to weather, so that the stability of a filling structure is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a construction method of a foam light soil composite roadbed for bridge head transition treatment.
Correspondingly, the embodiment of the invention provides a construction method of a foam light soil composite roadbed for bridge head transition treatment, which comprises the following steps:
paving a cushion layer on the original ground of the substrate;
pouring a protective wall foundation on the cushion layer, building a first light protective wall single layer surrounding the original roadbed on the protective wall foundation, and arranging a partition pouring template between the first light protective wall single layer and the original roadbed;
according to the partition pouring template, a first layer of foam light soil single layer is poured on the cushion layer in a partition mode to form a first layer of foam light soil filling body, and a reinforcement structure is laid on the first layer of foam light soil filling body;
and building a second light-weight protective wall single layer on the first light-weight protective wall single layer, pouring a second foam light-weight soil single layer on the first foam light-weight soil single layer according to the partition pouring template to form a second foam light-weight soil filling body, and paving a reinforcement structure on the second foam light-weight soil filling body, so as to circulate until a top foam light-weight soil filling body is formed, thereby completing the construction of the foam light-weight soil composite roadbed.
In an optional embodiment, the method for constructing a foamed lightweight soil composite roadbed further comprises:
ensuring that the original ground of the substrate is flat and has no accumulated water, and performing surface cleaning and rolling on the original ground of the substrate to ensure the bearing capacity of the original ground of the substrate;
and excavating one side of the original roadbed close to the bridge pier to form a step.
In an alternative embodiment, the paving a mat on a base ground comprises:
presetting a height marking pile on the original ground of the substrate;
propelling sandy soil or gravels on the original ground of the substrate, and paving the sandy soil or gravels into a cushion;
and rechecking the paving thickness of the cushion layer.
In an optional embodiment, the pouring of the protection wall foundation on the cushion layer, building a first light protection wall single layer surrounding the original roadbed on the protection wall foundation, and setting a partition pouring template between the first light protection wall single layer and the original roadbed includes:
pouring a protective wall foundation on the cushion layer, and embedding support pillars in advance after the protective wall foundation is poured;
building a first light-weight protective wall single layer surrounding the original roadbed on the protective wall base, and connecting the first light-weight protective wall single layer with the support columns through connecting rods;
paving a bottom anti-seepage geomembrane on a cushion layer between the first light-weight protective wall single layer and the original roadbed;
and arranging a partition pouring template between the first light-weight protective wall single layer and the original roadbed.
In an optional embodiment, the casting a first foamed light soil single layer on the cushion layer in a partitioned manner according to the partitioned casting template to form a first foamed light soil filling body, and laying a reinforcement structure on the first foamed light soil filling body includes:
according to the partition pouring template, a first layer of foamed light soil single layer is poured on the bottom anti-seepage geomembrane in a partition mode to form a first layer of foamed light soil filling body;
paving a reinforced structure on the first layer of foam light soil filling body;
and waiting for the first layer of foamed lightweight soil to finish setting.
In an optional embodiment, the constructing of the foamed lightweight soil composite roadbed comprises the steps of building a second lightweight protective wall single layer on the first lightweight protective wall single layer, pouring a second foamed lightweight soil single layer on the first foamed lightweight soil single layer according to the partition pouring templates to form a second foamed lightweight soil filling body, and laying a reinforcement structure on the second foamed lightweight soil filling body, so as to circulate until a top foamed lightweight soil filling body is formed, and completing the construction of the foamed lightweight soil composite roadbed:
building a second light protective wall single layer on the first light protective wall single layer, and connecting the second light protective wall single layer with the support columns through connecting rods;
according to the partition pouring template, pouring a second layer of foamed light soil single layer on the first layer of foamed light soil single layer to form a second layer of foamed light soil filling body;
paving a reinforced structure on the second layer of foam light soil filling body;
waiting for the second layer of foamed lightweight soil to finish setting;
and circulating the steps until a top foam light soil filling body is formed, and finishing the construction of the foam light soil composite roadbed.
In an optional implementation mode, the first light-weight protective wall single layer and the second light-weight protective wall single layer are both formed by building a plurality of prefabricated light-weight concrete blocks in a longitudinal staggered stacking mode, the prefabricated light-weight concrete blocks are connected with one another by building mortar, building seams among the prefabricated light-weight concrete blocks are pointing seams, and the width of each pointing seam is not more than 1cm.
In an optional embodiment, the reinforced structure is an intermediate steel-plastic geogrid;
when the middle steel-plastic geogrid is laid on the first layer of foam light soil filling body and the middle steel-plastic geogrid is laid on the second layer of foam light soil filling body, the middle steel-plastic geogrid is anchored by U-shaped nails, the longitudinal anchoring interval is 2m, and the transverse anchoring interval is 1m.
In an optional implementation manner, in the process of casting the first foamed light soil single layer in a subarea manner, in the process of casting the second foamed light soil single layer in a subarea manner, a settlement joint is arranged by using a clamping plate every time the foamed light soil with the thickness of 10cm to 20cm is cast, and the thickness of the clamping plate is 1.5cm.
In an optional embodiment, the method for constructing a foamed lightweight soil composite roadbed further comprises:
carrying out moisture preservation and maintenance on the foamed light soil composite roadbed;
and paving a top anti-seepage geomembrane on the foamed light soil composite roadbed.
The embodiment of the invention provides a construction method of a foam light soil composite roadbed for bridge head transition treatment, which is used for filling foam light soil between a light protective wall and an original roadbed, and performing bridge head transition section treatment by using the foam light soil: the light-weight protective walls are arranged around the foamed light-weight soil, have the characteristic of light weight, have material similarity with the foamed light-weight soil, can effectively reduce the differential settlement between the light-weight protective walls and the foamed light-weight soil, effectively improve the overall stability, have low requirements on the basic bearing capacity and can reduce the manufacturing cost; the light-weight protective wall can also play a good role in protecting the foam light-weight soil, so that the foam light-weight soil is prevented from being exposed in the air, the engineering attractiveness is ensured, meanwhile, the foam light-weight soil can be prevented from weathering, and the overall stability is ensured; the partitioned construction of the cushion layer and the foam light soil is realized through the partitioned pouring template, the construction progress can be accelerated, the construction period is shortened, and meanwhile, the construction quality is ensured; the light protection wall and the foam light soil are connected into an integral structure after construction is completed, and the integral stability is ensured; in addition, the reinforced structure is laid between layers, the reinforced structure runs through the protective wall single layer, the foam light soil single layer and the original roadbed, the reinforced connection effect is achieved, after construction is completed, the protective wall single layer, the foam light soil single layer and the original roadbed are connected into an integral structure through the reinforced structure, and overall stability is guaranteed. Therefore, the construction method of the foamed lightweight soil composite roadbed can solve the problems of insufficient overall stability, easy weathering, unattractive appearance, high cost and long construction period in the conventional construction method of the bridge transition section.
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 construction method of a foamed lightweight soil composite roadbed in the embodiment of the invention;
FIG. 2 is a schematic longitudinal sectional view of a foamed lightweight soil composite roadbed structure according to the embodiment of the invention;
FIG. 3 is a schematic cross-sectional view of a foamed lightweight soil composite roadbed structure according to the embodiment of the invention;
FIG. 4 is a vertical cross-section of a lightweight protective wall in an embodiment of the invention;
FIG. 5 is a transverse cross-sectional view of a lightweight protective wall in an embodiment of the invention;
FIG. 6 is a front view of a lightweight protective wall in an embodiment of the invention;
FIG. 7 is a flowchart illustrating the detailed procedure of S3 in the embodiment of the present invention;
FIG. 8 is a schematic diagram of a detailed flow chart of S4 in the embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating a detailed flow of S5 in the embodiment of the present invention;
fig. 10 is a schematic specific flowchart of S6 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 construction method of a foamed lightweight soil composite roadbed in the embodiment of the invention.
The embodiment of the invention provides a construction method of a foam light soil composite roadbed for bridge head transition treatment, which comprises the following steps:
s1: ensuring that the original ground of the substrate is flat and has no accumulated water, and performing surface cleaning and rolling on the original ground of the substrate to ensure the bearing capacity of the original ground of the substrate;
in the embodiment of the invention, a water pump can be adopted to pump away the accumulated water in the original ground of the substrate, so as to ensure that no accumulated water exists in the original ground of the substrate; the original ground of the substrate can be shaped by a grader, so that the original ground of the substrate is ensured to be flat; the base original ground can be rolled by a road roller, so that the bearing capacity of the base original ground is ensured.
S2: excavating one side of the original roadbed 7 close to the bridge abutment 12 into a step form;
it should be noted that the excavation height and the range of the step form need to be determined according to actual engineering.
Fig. 2 is a schematic longitudinal section of a foam lightweight soil composite roadbed structure in an embodiment of the invention, fig. 3 is a schematic cross-sectional view of the foam lightweight soil composite roadbed structure in the embodiment of the invention, fig. 4 is a vertical sectional view of a lightweight protective wall in the embodiment of the invention, fig. 5 is a transverse sectional view of the lightweight protective wall in the embodiment of the invention, and fig. 6 is a front view of the lightweight protective wall in the embodiment of the invention.
In fig. 2 to 6, reference numeral 1 denotes a foamed lightweight soil filling body formed by a plurality of foamed lightweight soil single layers after construction, reference numeral 22 denotes a lightweight protective wall formed by a plurality of foamed lightweight protective wall single layers after construction, and reference numeral 2 denotes an integral connection structure of the lightweight protective wall and the support column 23.
S3: paving a cushion layer 13 on the original ground of the substrate;
fig. 7 is a specific flowchart of S3 in the embodiment of the present invention.
In the embodiment of the present invention, the paving of the cushion layer 13 on the base original ground includes:
s31: presetting a height marking pile on the original ground of the substrate;
firstly, retesting, measuring and finishing the original ground of the substrate to ensure that the plane size, the elevation and the bearing capacity of the foundation of the original ground of the substrate meet the design requirements, and simultaneously ensuring that the original ground of the substrate has no accumulated water, no sundries and no soft soil.
Then, the height-marking piles are preset on the original ground of the substrate according to 10-10 m grids, so that the paving thickness of the cushion layer 13 can be controlled visually.
S32: propelling sand or gravel on the original ground of the substrate, and paving the sand or gravel into a cushion layer 13;
in the embodiment of the present invention, the sandy soil or gravel is propelled on the base raw ground by a propelling method, that is, the prepared sandy soil or gravel is transported to the paving starting point of the base raw ground by a transport vehicle, and then the sandy soil or gravel is propelled by a bulldozer to be paved into the mat 13.
Meanwhile, the influence of the transportation vehicle and the bulldozer on the base ground needs to be considered.
In addition, a groove with the width of 2-3cm and the depth of 2-3cm is reserved in the cushion layer 13, so that the arrangement and installation of the partition pouring template are facilitated.
S33: rechecking the paving thickness of the cushion layer 13;
in the embodiment of the invention, after the cushion layer 13 is flattened and compacted, the paving thickness of the cushion layer 13 is rechecked by using a level gauge.
S4: pouring a protective wall foundation 21 on the cushion layer 13, building a first light protective wall single layer surrounding the original roadbed 7 on the protective wall foundation 21, and arranging a partition pouring template between the first light protective wall single layer and the original roadbed 7;
fig. 8 is a schematic specific flowchart of S4 in the embodiment of the present invention.
In the embodiment of the present invention, the pouring of the protective wall foundation 21 on the cushion layer 13, building a first light protective wall single layer surrounding the original roadbed 7 on the protective wall foundation 21, and setting a partition pouring template between the first light protective wall single layer and the original roadbed 7 includes:
s41: pouring a protective wall foundation 21 on the cushion layer 13, and embedding a support pillar 23 in time after pouring the protective wall foundation 21;
in the embodiment of the invention, the pouring of the protective wall foundation 21 is horizontal, and the protective wall foundation 21 is preferably a C25 concrete foundation, so that the construction requirement is met.
After the protective wall foundation 21 is poured, the supporting columns 23 are embedded in time and vertically, the embedding positions of the supporting columns 23 are accurate, and meanwhile the perpendicularity of the supporting columns 23 is guaranteed.
S42: building a first light protection wall single layer surrounding the original roadbed 7 on the protection wall foundation 21, and connecting the first light protection wall single layer with the support columns 23 through connecting rods;
the connecting rod can strengthen the auxiliary support relation between the first light-weight protective wall single layer and the support column 23, and the overall stability of the first light-weight protective wall single layer is effectively improved.
In the present embodiment, the connecting rod includes a tie rod 24 and a connecting member 25.
The connection member 25 is provided on the first lightweight type protective wall single layer to perform a connection function.
Two ends of the pull rod 24 are respectively connected with the connecting member 25 on the first light-weight protective wall single layer, and the middle part of the pull rod 24 bypasses the support column 23 and is connected with the support column 23.
S43: and laying a bottom impermeable geomembrane 31 on the cushion layer 13 between the first light-weight protective wall single layer and the original roadbed 7.
In the embodiment of the present invention, firstly, the cushion layer 13 between the first lightweight protective wall single layer and the original roadbed 7 needs to be covered with poured foam lightweight soil, and then the bottom impermeable geomembrane 31 is laid, so as to prevent the cushion layer 13 from puncturing and damaging the bottom impermeable geomembrane 31.
Wherein, the bottom of the bottom anti-seepage geomembrane 31 is wrapped upwards by 1 meter around the foam light soil along a single layer of the light protection wall, and the periphery of the top is wrapped downwards by 0.5 meter.
The periphery of the bottom anti-seepage geomembrane 31 is sealed and installed by adopting press strips, so that the bottom is ensured to be not less than 1m upwards along the light-weight protective wall.
The bottom anti-seepage geomembrane 31 adopts a double-welding-seam hot-melting welding process, the width of a welding seam is 2.5cm, and the lap joint length of the bottom anti-seepage geomembrane 31 is not less than 5cm.
Sundries on the surface of the welding seam are cleaned up before welding, and the welding seam forms a T-shaped welding seam according to dislocation.
And in consideration of larger foundation deformation, reserving the expansion and contraction release amount according to 2-5% when the bottom anti-seepage geomembrane 31 is laid.
S44: arranging a partition pouring template between the first light-weight protective wall single layer and the original roadbed 7;
in the embodiment of the invention, the partition pouring template has the following requirements:
1. when the longitudinal and transverse dimensions of the total casting area are large, the area of the single-partition casting area should not exceed 400m at most 2 In the embodiment of the present invention, it is preferably 300m 2 。
2. The length of the single partition casting area in the long axis direction is 10-20 m.
It should be noted that the partition pouring template is arranged to realize partition construction of the cushion layer 13 and the foamed light soil, so that the construction progress can be accelerated, the construction period can be shortened, and the construction quality can be ensured.
S5: according to the partition pouring template, a first layer of foam light soil single layer is poured on the cushion layer 13 in a partition mode to form a first layer of foam light soil filling body, and a reinforcement structure 4 is laid on the first layer of foam light soil filling body.
Fig. 9 is a specific flowchart of S5 in the embodiment of the present invention.
In the embodiment of the present invention, the casting a first foamed light soil single layer in different areas on the cushion layer 13 according to the casting template in different areas to form a first foamed light soil filling body, and laying a reinforcement structure 4 on the first foamed light soil filling body includes:
s51: according to the partition pouring template, a first layer of foam light soil single layer is poured on the bottom anti-seepage geomembrane 31 in a partition mode to form a first layer of foam light soil filling body;
in the embodiment of the invention, a first foamed light soil single layer is poured on the bottom impermeable geomembrane 31 in a partition mode in a pumping pouring mode, the height of the first foamed light soil single layer is the same as that of the first light protective wall single layer, and the first foamed light soil single layer and the first light protective wall single layer are combined to form a first foamed light soil filling body.
S52: paving a reinforced structure 4 on the first layer of foam light soil filling body;
the reinforced structure 4 is preferably an intermediate steel-plastic geogrid.
S53: waiting for the first layer of foamed lightweight soil to finish setting;
in the embodiment of the invention, the first layer of foamed lightweight soil needs to be waited for final setting, and then a second lightweight protective wall single layer can be built on the first lightweight protective wall single layer.
S6: building a second light protective wall single layer on the first light protective wall single layer, pouring a second foam light soil single layer on the first foam light soil single layer according to the partition pouring template to form a second foam light soil filling body, and paving a reinforcement structure 4 on the second foam light soil filling body, so as to circulate until a top foam light soil filling body is formed, thereby completing the construction of the foam light soil composite roadbed;
fig. 10 is a schematic specific flowchart of S6 in the embodiment of the present invention.
In the embodiment of the present invention, the method specifically includes:
s61: building a second light protection wall single layer on the first light protection wall single layer, and connecting the second light protection wall single layer with the support column 13 through a connecting rod;
the connecting rod can strengthen the auxiliary support relation between the second light protection wall single layer and the support column 23, and the overall stability of the second light protection wall single layer is effectively improved.
In the present embodiment, the connecting rod includes a tie rod 24 and a connecting member 25.
The connection member 25 is provided on the second lightweight type protective wall single layer to perform a connection function.
Two ends of the pull rod 24 are respectively connected with the connecting member 25 on the second light protection wall single layer, and the middle part of the pull rod 24 bypasses the support column 23 and is connected with the support column 23.
S62: according to the partition pouring template, a second layer of foam light soil single layer is poured on the first layer of foam light soil single layer to form a second layer of foam light soil filling body;
in the embodiment of the invention, according to the partition pouring template, a second foamed light soil single layer is poured on the first foamed light soil single layer in a pumping pouring mode, the height of the second foamed light soil single layer is the same as that of the second light protective wall single layer, and the second foamed light soil single layer and the second light protective wall single layer are combined to form a second foamed light soil filling body.
S63: paving a reinforced structure 4 on the second layer of foam light soil filling body;
the reinforced structure 4 is preferably an intermediate steel-plastic geogrid.
S64: waiting for the second layer of foamed lightweight soil to finish setting;
in the embodiment of the invention, the second layer of foamed lightweight soil needs to be waited for final setting before circulation can be carried out.
S65: and circulating the steps until a top foam light soil filling body is formed, and finishing the construction of the foam light soil composite roadbed.
In the embodiment of the invention, the first lightweight protective wall single layer and the second lightweight protective wall single layer are both built by a plurality of prefabricated lightweight concrete blocks 28 in a longitudinal staggered stacking manner, so that differential settlement between the first layer of lightweight foam soil single layer and the second layer of lightweight foam soil single layer can be effectively reduced, and the stability of a filling structure is effectively improved; the plurality of prefabricated lightweight concrete blocks 28 are connected by masonry mortar 26, and the joints among the plurality of prefabricated lightweight concrete blocks 28 are pointing joints, wherein the joint width of the pointing joints is not more than 1cm.
It should be noted that the longitudinally staggered stacking approach can achieve greater stability than the parallel stacking approach.
It should be noted that the masonry mortar 26 can fill the gaps between the plurality of prefabricated lightweight concrete blocks 28, so that the connection between the plurality of prefabricated lightweight concrete blocks 28 can be firmer, wind and rain can be prevented from invading the wall, and the wall is clean, neat and beautiful.
It should be noted that the jointing can fill the masonry mortar 26, further strengthen the connection between the plurality of precast lightweight concrete blocks 28, and further make the wall surface clean, neat and beautiful.
Preferably, the C25 concrete foundation is connected with the first lightweight protective wall single-layer lightweight precast block 28 through mortar 27.
The light prefabricated building block 28 is made of aerated concrete mixed on site and is prefabricated and formed by a rectangular mould, the light prefabricated building block 28 is a cuboid building block, and the specific size can be adjusted according to engineering requirements.
It should be noted that, the lightweight precast block 28 made of aerated concrete has the characteristic of lightweight, can effectively reduce differential settlement between a single layer of the protective wall and a single layer of foamed lightweight soil, has low requirements for basic bearing capacity, and can reduce manufacturing cost.
Preferably, the masonry mortar 6 adopts M7.5 mortar.
In the embodiment of the invention, when the middle steel-plastic geogrid is laid on the first layer of foamed light-weight soil filling body and the middle steel-plastic geogrid is laid on the second layer of foamed light-weight soil filling body, the middle steel-plastic geogrid is anchored by U-shaped nails, the longitudinal anchoring interval is 2m, and the transverse anchoring interval is 1m.
It should be noted that, in the embodiment of the present invention, the stacking of the single layer of the protective wall and the pouring of the single layer of the foamed lightweight soil are alternately performed, after the alternate construction, the middle steel-plastic geogrid is laid between the layers, and the steel-plastic geogrid penetrates through the single layer of the protective wall, the single layer of the foamed lightweight soil and the original roadbed 7 to perform the function of reinforcement connection, and after the construction is completed, the single layer of the protective wall, the single layer of the foamed lightweight soil and the original roadbed 7 are connected into an integral structure through the steel-plastic geogrid, so as to ensure the overall stability.
Preferably, the middle steel-plastic geogrid is a GSZ60-60 type middle steel-plastic geogrid.
In the embodiment of the invention, in the process of casting the first foamed light soil single layer in a subarea manner, in the process of casting the second foamed light soil single layer in a subarea manner, the thickness of the foamed light soil single layer is preferably 0.3-1.0m, and in the process, when the foamed light soil with the thickness of 10 cm-20 cm is cast, a settlement joint is arranged by using a clamping plate, and the thickness of the clamping plate is 1.5cm.
The foam lightweight soil is prepared by a foam concrete machine from a mixture of foam and cement paste, the foam is prepared by physically foaming an enhanced foaming agent, and the cement paste mixture is prepared by stirring cement, an additive and water by a stirrer.
In the process of casting the single-layer foamed lightweight soil in the subarea, if only one casting pipe is used for casting, the foamed lightweight soil is cast from one end to the other end along the long axis direction of the casting area, and if two or more casting pipes are used for casting, the foamed lightweight soil can be cast from two ends of the long axis direction of the casting area to the middle position, or the foamed lightweight soil is cast in the casting area in an opposite angle mode.
In addition, in the process of the partitioned pouring of the single layer of the foamed light soil, when the pouring pipe needs to be moved, the pouring pipe should be moved back and forth along the placing direction of the pouring pipe, but the pouring pipe should not be moved left and right, and the pouring pipe should be moved after being moved out of the foamed light soil.
In addition, in the process of the single-layer subarea casting of the foamed light soil, the casting construction time of each subarea should be controlled within two hours so as to ensure the casting efficiency and the casting effect of the foamed light soil.
S7: carrying out moisture preservation and maintenance on the foamed light soil composite roadbed;
in the embodiment of the invention, after the construction of the foamed light soil composite roadbed is completed, a plastic film is required to cover the foamed light soil composite roadbed, the foamed light soil composite roadbed is subjected to moisturizing maintenance for at least 7 days, and the plastic film is removed after the moisturizing maintenance.
S8: and laying a top impermeable geomembrane 32 on the foamed light soil composite roadbed.
And after moisturizing and maintaining the foamed light soil composite roadbed, paving a top layer anti-seepage geomembrane 32 on the foamed light soil composite roadbed.
The lap joint should adopt the hot welding mode when top layer prevention of seepage geomembrane 32 is laid, and the overlap joint width of continuous geomembrane is 5cm, should open up the flat taut top layer prevention of seepage geomembrane 32 that should lay, avoids appearing the phenomenon of local curl up.
Preferably, the bottom and top impermeable geomembranes 31 and 32 are HDPE impermeable geomembranes, preferably CH-1 type polyethylene geomembranes, preferably having a thickness of between 0.3mm and 0.6 mm.
In addition, after the top impermeable geomembrane 32 is laid on the foamed light soil composite roadbed, the structural layer 6 can be constructed on the top impermeable geomembrane 32 only when the strength needs to reach 0.6 Mpa.
The embodiment of the invention provides a construction method of a foam light soil composite roadbed for bridge head transition treatment, which is used for filling foam light soil between a light protective wall and an original roadbed 7, and performing bridge head transition section treatment by using the foam light soil: the light-weight protective walls are arranged around the foamed light-weight soil, have the characteristic of light weight, have material similarity with the foamed light-weight soil, can effectively reduce the differential settlement between the light-weight protective walls and the foamed light-weight soil, effectively improve the overall stability, have low requirements on the basic bearing capacity and can reduce the manufacturing cost; the light-weight protective wall can also play a good role in protecting the foam light-weight soil, so that the foam light-weight soil is prevented from being exposed in the air, the engineering attractiveness is ensured, meanwhile, the foam light-weight soil can be prevented from weathering, and the overall stability is ensured; the partitioned construction of the cushion layer 13 and the foam light soil is realized through the partitioned pouring template, the construction progress can be accelerated, the construction period is shortened, and meanwhile, the construction quality is ensured; the lightweight protective wall has the template effect during the pouring of the foamed light soil, so that the use of pouring templates can be reduced, the construction progress is accelerated, the construction period is shortened, the lightweight protective wall and the foamed light soil are connected into an integral structure after the construction is finished, and the integral stability is ensured; in addition, reinforced structure 4 is laid between the layer, reinforced structure 4 runs through protection wall individual layer, foam light soil individual layer and original road bed 7, plays the effect that adds the muscle connection, passes through after the construction is accomplished reinforced structure 4 links protection wall individual layer, foam light soil individual layer and original road bed 7 into overall structure, guarantees overall stability. Therefore, the construction method of the foamed lightweight soil composite roadbed can solve the problems of insufficient overall stability, easy weathering, unattractive appearance, high cost and long construction period in the conventional bridge transition section construction method.
In addition, the above detailed description is provided for the construction method of the foamed lightweight soil composite roadbed for bridge head transition treatment according to the embodiment of the present invention, and a specific example is used herein to explain the principle and the implementation manner of the present invention, and the above description of the 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 (8)
1. A construction method of a foam light soil composite roadbed for bridge head transition treatment is characterized by comprising the following steps:
ensuring that the original ground of the substrate is flat and has no accumulated water, and performing surface cleaning and rolling on the original ground of the substrate to ensure the bearing capacity of the original ground of the substrate;
excavating one side of the original roadbed close to the bridge pier into a step form;
paving a cushion layer on the original ground of the substrate;
pouring a protective wall foundation on the cushion layer, building a first light protective wall single layer surrounding the original roadbed on the protective wall foundation, and arranging a partition pouring template between the first light protective wall single layer and the original roadbed;
according to the partition pouring template, a first layer of foam light soil single layer is poured on the cushion layer in a partition mode to form a first layer of foam light soil filling body, and a reinforcement structure is laid on the first layer of foam light soil filling body;
building a second light protective wall single layer on the first light protective wall single layer, pouring a second foam light soil single layer on the first foam light soil single layer according to the partition pouring template to form a second foam light soil filling body, and paving a reinforcement structure on the second foam light soil filling body, so as to circulate until a top foam light soil filling body is formed, and finishing the construction of the foam light soil composite roadbed;
pouring a protective wall foundation on the cushion layer, building a first light protective wall single layer surrounding the original roadbed on the protective wall foundation, and arranging a partition pouring template between the first light protective wall single layer and the original roadbed, wherein the partition pouring template comprises the following steps:
pouring a protective wall foundation on the cushion layer, and embedding support columns in advance in time after the protective wall foundation is poured;
building a first light-weight protective wall single layer surrounding an original roadbed on the protective wall, and connecting the first light-weight protective wall single layer with the support columns through connecting rods, wherein each connecting rod comprises a pull rod and a connecting member, the connecting members are arranged on the first light-weight protective wall single layer, two ends of each pull rod are respectively connected with the connecting members on the first light-weight protective wall single layer, and the middle part of each pull rod bypasses the support columns and is connected with the support columns;
laying a bottom anti-seepage geomembrane on a cushion layer between the first light protective wall single layer and the original roadbed;
and arranging a partition pouring template between the first light-weight protective wall single layer and the original roadbed.
2. The construction method of a foamed lightweight soil composite roadbed according to claim 1, wherein the step of laying a cushion layer on the foundation ground comprises:
presetting a height marking pile on the original ground of the substrate;
propelling sandy soil or gravels on the original ground of the substrate, and paving the sandy soil or gravels into a cushion;
and rechecking the paving thickness of the cushion layer.
3. The construction method of the foam lightweight soil composite roadbed according to the partition casting template, wherein the first foam lightweight soil single layer is cast on the cushion layer in a partition mode according to the partition casting template to form a first foam lightweight soil filling body, and a reinforcement structure is laid on the first foam lightweight soil filling body, and the construction method comprises the following steps:
according to the partition pouring template, a first layer of foamed light soil single layer is poured on the bottom anti-seepage geomembrane in a partition mode to form a first layer of foamed light soil filling body;
paving a reinforced structure on the first layer of foam light soil filling body;
and waiting for the first layer of foamed lightweight soil to finish setting.
4. The construction method of the foam light soil composite roadbed according to claim 3, wherein the construction of the foam light soil composite roadbed is completed by building a second light protective wall single layer on the first light protective wall single layer, pouring a second foam light soil single layer on the first foam light soil single layer according to the partition pouring template to form a second foam light soil filling body, and laying a reinforcement structure on the second foam light soil filling body, and circulating the steps until a top foam light soil filling body is formed, and the construction of the foam light soil composite roadbed is completed, and the construction method comprises the following steps of:
building a second light protective wall single layer on the first light protective wall single layer, and connecting the second light protective wall single layer with the support columns through connecting rods;
according to the partition pouring template, pouring a second layer of foamed light soil single layer on the first layer of foamed light soil single layer to form a second layer of foamed light soil filling body;
paving a reinforced structure on the second layer of foam light soil filling body;
waiting for the second layer of foamed lightweight soil to finish setting;
and circulating the steps until a top foam light soil filling body is formed, and finishing the construction of the foam light soil composite roadbed.
5. The foam lightweight soil composite roadbed construction method according to claim 4, wherein the first lightweight protection wall single layer and the second lightweight protection wall single layer are both built by a plurality of prefabricated lightweight concrete blocks in a longitudinal staggered stacking mode, the prefabricated lightweight concrete blocks are connected by building mortar, building seams among the prefabricated lightweight concrete blocks are pointing, and the seam width of the pointing is not more than 1cm.
6. The construction method of the foamed lightweight soil composite roadbed according to claim 4, wherein the reinforcement structure is an intermediate steel-plastic geogrid;
when the middle steel-plastic geogrid is laid on the first layer of foam light soil filling body and the middle steel-plastic geogrid is laid on the second layer of foam light soil filling body, the middle steel-plastic geogrid is anchored by U-shaped nails, the longitudinal anchoring interval is 2m, and the transverse anchoring interval is 1m.
7. The construction method of the foamed light soil composite roadbed according to claim 4, wherein in the process of casting the first foamed light soil single layer in a subarea manner, in the process of casting the second foamed light soil single layer in a subarea manner, a settlement joint is arranged by using a clamping plate every time the foamed light soil with the thickness of 10cm to 20cm is cast, and the thickness of the clamping plate is 1.5cm.
8. The construction method of a foam lightweight soil composite roadbed according to claim 1, wherein the construction method of a foam lightweight soil composite roadbed further comprises:
carrying out moisturizing maintenance on the foamed lightweight soil composite roadbed;
and paving a top anti-seepage geomembrane on the foamed light soil composite roadbed.
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| CN208981122U (en) * | 2018-10-15 | 2019-06-14 | 青海第三路桥建设有限公司 | A kind of bridge platform back Foam lightweight soil roadbed backfill structure |
| CN110042716B (en) * | 2019-04-30 | 2021-09-17 | 杭州悦为科技有限公司 | Widening construction method for high-fill roadbed with foamed light soil |
| CN110578290B (en) * | 2019-08-14 | 2024-04-05 | 山东高速工程检测有限公司 | Bridge abutment back backfill structure and construction method thereof |
| CN112095380A (en) * | 2020-08-07 | 2020-12-18 | 广东盛瑞科技股份有限公司 | Layered filling method for light combined roadbed at steep slope section |
| CN112144337A (en) * | 2020-09-04 | 2020-12-29 | 广东同创科鑫环保有限公司 | Cast-in-place construction process for modified red mud-based foam light soil |
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