CN115478458A - Integrated structure of white-to-black road surface of existing road bed block stone retaining wall and construction method - Google Patents

Integrated structure of white-to-black road surface of existing road bed block stone retaining wall and construction method Download PDF

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Publication number
CN115478458A
CN115478458A CN202211169154.4A CN202211169154A CN115478458A CN 115478458 A CN115478458 A CN 115478458A CN 202211169154 A CN202211169154 A CN 202211169154A CN 115478458 A CN115478458 A CN 115478458A
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retaining wall
steel wire
wire mesh
layer
mesh
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Inventor
冯杰
罗平
徐炎锋
李亮
杜雨波
鲁镔演
周贤明
夏小娟
何海伟
王利平
王林旭
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Ningbo Communication Engineering Construction Group Co Ltd
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Ningbo Communication Engineering Construction Group Co Ltd
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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
    • 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
    • E01C11/00—Details of pavings
    • E01C11/005—Methods or materials for repairing pavings
    • 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
    • E01C11/00—Details of pavings
    • E01C11/16—Reinforcements
    • 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
    • E01C3/02—Concrete base for bituminous paving
    • 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
    • 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
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
    • 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
    • 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
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains

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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)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention discloses a white-to-black road surface integrated structure of an existing road block stone retaining wall and a construction method, wherein the structure comprises the retaining wall, a drain pipe, a filling part and a raw cement concrete road surface of an original road bed, the raw cement concrete road surface is mainly subjected to resonance rubblization to form a base layer, a steel wire mesh and a surface layer are sequentially laid on the base layer, steel bar meshes fixed by anchoring steel bars are arranged on the outer side and the top of the retaining wall, and the steel bar meshes and the steel wire mesh on the base layer are mutually connected and sprayed with cement concrete to form an integrated structure; therefore, the invention has the advantages of simple structure, economy, applicability, safety, reliability, energy conservation, emission reduction, dynamic self-stress balance and the like, can better save energy and protect resources, embodies the construction concept of green energy-saving road engineering, combines with a corresponding construction method, and has higher economic benefit, energy conservation, emission reduction benefit and social benefit.

Description

Integrated structure of white-to-black road surface of existing road bed block stone retaining wall and construction method
Technical Field
The invention relates to the field of energy-saving road construction, in particular to a white-to-black road surface integrated structure of an existing roadbed block stone retaining wall and a construction method.
Background
In order to actually improve the happiness and the acquaintance of people in mountainous areas, four good rural villages are built, ecological tourism roads in rural areas are beautified, abundant tourism resources in mountainous areas are developed, the road traffic capacity and the service level are improved, and the early-stage construction of a damaged cement concrete pavement into an asphalt concrete pavement, namely 'white-to-black' and the reinforcement and reconstruction of a roadbed retaining wall are needed.
The method is characterized in that cement concrete is poured on the outer side of an original retaining wall to increase the section of the retaining wall or additionally arrange a tie bar in a roadbed to reinforce the retaining wall, meanwhile, a steel wire mesh is arranged between a new asphalt concrete pavement and a base layer of a resonance rubblization of the original asphalt concrete pavement to change the asphalt concrete pavement into white and black, the old road reconstruction method reconstructs the pavement and the retaining wall as independent parts, the mutual relation between the pavement and the retaining wall is ignored, and the total stress and the economic benefit of the structure are poor. The overall coordinated stress effect of each part of the engineering structure is better than the independent stress of each part, so that the method of integrally designing the bottom steel wire mesh of the white-modified black asphalt concrete pavement and the reinforcement of the original retaining wall is adopted, the coordinated stress of the pavement and the retaining wall is obviously facilitated, and the greater economic benefit and energy-saving benefit are brought into play.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the integrated structure of the white-to-black road surface of the existing retaining wall of the roadbed block stone and the construction method thereof, wherein the integrated structure has the advantages of simple structure, economy, applicability, safety, reliability, energy conservation, emission reduction and dynamic self-stress balance.
The technical problem of the invention is realized by the following technical scheme:
a white-to-black road surface integrated structure of an existing road bed block stone retaining wall comprises the retaining wall, a drain pipe, a filling and an original cement concrete road surface of an original road bed, wherein the original cement concrete road surface is subjected to resonance rubblization to form a base layer, and a steel wire mesh and a surface layer are sequentially laid on the base layer; the outside and the top of the retaining wall are both provided with reinforcing mesh fixed by anchoring steel bars, and the reinforcing mesh and a steel wire mesh on the base layer are connected with each other and sprayed with cement concrete to form an integrated structure.
The surface layer generates a deflection disc under the action of automobile load, and the deflection disc is arranged on the surface layerxoyThe plane deflection curve is simulated by using Logistic equation, namely Logistic curve
Figure 276271DEST_PATH_IMAGE001
Equation of deflection curve
Figure 758068DEST_PATH_IMAGE002
To wind aroundxoyPlane surfaceyThe shaft rotates for a circle to form a concave deflection basin, the compression deformation of the surface layer is ignored, the steel wire mesh deformation curve and the surface layer synchronously sink to form a Logistic deflection curve with the same shape, and the steel wire mesh settlement is subjected to the counter force intensity of
Figure 250360DEST_PATH_IMAGE003
Then, the following calculation formula is obtained:
formula I,
Center of steel wire mesh deflection discOContact part of steel wire mesh and surface course side at top of retaining wallAAnd the middle point between two tire sets of the standard axle load of the automobileBRespectively is
Figure 665161DEST_PATH_IMAGE004
To do so byOBeing the originxoyEach undetermined parameter of the Logistic deflection curve equation in the plane and the related calculation formula are as follows:
Figure 919294DEST_PATH_IMAGE005
in the formula
Figure 153966DEST_PATH_IMAGE006
Thus, each undetermined parameter of Logistic deflection curve is obtained
Figure 387632DEST_PATH_IMAGE007
；
Figure 594623DEST_PATH_IMAGE008
The second formula,
Under the condition of single vehicle running, the contact position of the steel wire mesh with unit width and the steel bar mesh on the top of the retaining wall is formed according to the force balance principleATensile force and maximum deflection therebetweenORespectively at a tension of
Figure 100002_DEST_PATH_IMAGE009
In the formula
Figure 822254DEST_PATH_IMAGE010
When a plurality of vehicles act simultaneously on the section of the pavement surface course, the contact part of the steel wire mesh with unit width and the steel bar mesh at the top of the retaining wallAAnd maximum deflectionOThe tension at the point is calculated according to the superposition principle:
the formula III,
Figure 100002_DEST_PATH_IMAGE011
The steel wire mesh at the bottom of the surface layer and the steel bar mesh for reinforcing the retaining wall are mutually connected at the top of the retaining wall, when a vehicle runs on the surface layer, the steel wire mesh at the bottom of the surface layer is settled and extended to generate tension on the top of the retaining wall, the tension is dynamic and disappears along with the leaving of the vehicle, the tension is increased along with the increase of the weight and the number of the vehicle, and the direction of the tension is opposite to the horizontal active soil pressure direction of the retaining wall;
the symbols in formula one, formula two and formula three are defined as:
Figure 154009DEST_PATH_IMAGE007
-respectively fitting parameters of the Logistic deflection curve,
Figure 440634DEST_PATH_IMAGE012
no dimension, no dimension,
Figure 813715DEST_PATH_IMAGE013
；
Figure 160383DEST_PATH_IMAGE014
-automotive standardsThe axial load is a single circle with a radius,
Figure 385959DEST_PATH_IMAGE012
；
Figure 882799DEST_PATH_IMAGE015
respectively, the standard axle-loaded single-circle center of the automobile close to one side of the retaining wall to the top of the retaining wallADistance of, standard axle load single circle center of automobileOIs positioned to the middle point between two standard axle load tyre groups of the automobileBThe distance between the two or more of (a) and (b),
Figure 861120DEST_PATH_IMAGE012
；
Figure 627956DEST_PATH_IMAGE002
the surface layer generates a deflection plate under the action of the load of the automobile, and the deflection platexoyThe plane deflection curve is simulated by using Logistic equation which is the deflection curve equation
Figure 386834DEST_PATH_IMAGE016
To deflect the basin
Figure 500414DEST_PATH_IMAGE002
Is wound with a curvexoyPlane surfaceyThe shaft rotates for a circle to form a concave deflection basin;
Figure 598820DEST_PATH_IMAGE017
the strength of the standard single-circle uniform load of the automobile axle load, the strength of the dead weight of the surface layer material and the strength of the counter force applied to the settlement of the steel wire mesh under the action of the standard single-circle uniform load of the automobile axle load are respectively obtained,
Figure 959395DEST_PATH_IMAGE018
；
Figure 658098DEST_PATH_IMAGE019
respectivelyThe friction coefficient between the steel wire mesh and the surface layer and the base layer and the foundation reaction coefficient,
Figure 559058DEST_PATH_IMAGE020
obtained by looking up data or actually measuring, and has no dimension,
Figure 528282DEST_PATH_IMAGE021
；
Figure 184391DEST_PATH_IMAGE022
-the steel wire mesh and the top of the retaining wall are respectively in unit widthAThe tension force and the unit width steel wire mesh are arranged at the standard axle load single circle center of the automobileOThe tension of the steel wire mesh and the allowable tension of the steel wire mesh,
Figure 325652DEST_PATH_IMAGE023
；
Figure 358199DEST_PATH_IMAGE024
respectively at any position after the steel wire mesh is settled and deformedxIncluded angle of shaft, near the top of retaining wallAIs treated withxIncluded angle of shaft, standard axle load single circle center of automobileOIs treated withxIncluded angle of axle, middle point between two tyre groups of standard axle load of carBIs treated withxThe included angle of the axes is set by the angle,
Figure 916351DEST_PATH_IMAGE025
；
Figure 946623DEST_PATH_IMAGE026
the friction resistance stress between the steel wire mesh and the surface layer and the base layer,
Figure 354340DEST_PATH_IMAGE018
；
Figure 534786DEST_PATH_IMAGE027
-using standard automobile axle to carry single round bending sinking plateCenter of a shipOAt the origin of coordinatesxA shaft,yThe shaft is provided with a plurality of axial holes,
Figure 727869DEST_PATH_IMAGE012
；
Figure 414197DEST_PATH_IMAGE028
-the number of coefficients is,
Figure 59942DEST_PATH_IMAGE023
。
the steel bar net and the steel wire net on the base layer are connected with each other and sprayed with cement concrete to form a protective layer, the protective layer of the sprayed cement concrete is C30, the thickness of the protective layer is 8 cm-20 cm, the thickness of the protective layer of the steel bar net is not less than 3cm, and the protective layer on the top of the retaining wall can also be made of cast-in-situ C30 cement concrete.
The reinforcing mesh is a reinforcing mesh formed by welding hot rolled steel bars; the reinforcing mesh and the steel wire mesh on the top of the retaining wall are welded into a whole, and the protective layer and the surface layer form an integrated structure to bear force together.
The anchoring steel bar is a hot rolled steel bar; the reinforcing mesh and the outer side and the top of the retaining wall are fixed through anchoring reinforcing bars, and the anchoring reinforcing bars are inserted into block stone gaps of the retaining wall or drilled holes are inserted into block stones of the retaining wall and are distributed in a quincunx shape.
The steel wire mesh is a hexagonal double-twisted metal mesh woven by antiseptic treated steel wires through a machine, and the longitudinal lap joint width of the steel wire mesh is 20-30 cm, and the transverse lap joint width of the steel wire mesh is 15-20 cm; a plurality of distributed reinforcing steel bars are woven into the steel wire mesh at certain intervals along the longitudinal direction of the base layer, and simultaneously, 1 distributed reinforcing steel bar is respectively woven into the edges of the two sides of the base layer along the longitudinal direction; the steel wire mesh is fixed on the base layer through anchoring steel nails, and the anchoring points of the anchoring steel nails are longitudinally 90-100 cm or 50-60 cm and transversely 70-80 cm or 40-50 cm and are arranged in a quincunx shape.
The distributed reinforcing steel bars are ordinary hot-rolled round reinforcing steel bars, the distance between every two adjacent hexagonal meshes is 1 or 2, and 1 distributed reinforcing steel bar which is respectively woven into the edges of the two sides of the base layer along the longitudinal direction is disconnected every 2-3 m and releases stress.
The retaining wall is a protective structure of a mountain road foundation block masonry to be improved; the surface layer is a modified black asphalt concrete pavement.
The base layer is formed by crushing a raw cement concrete pavement through a resonance crusher, the upper half part of the base layer is made into compact granular fragments smaller than 10cm, and the lower half part of the base layer is made into interlocking and meshing granular fragments of 10 cm-20 cm.
A construction method of a white-to-black road surface integrated structure of an existing road block stone retaining wall comprises the following steps:
step one, the integrated structural design of the white-to-black road surface of the retaining wall
Figure 417980DEST_PATH_IMAGE029
Investigating and analyzing the current situation and the bearing capacity of the retaining wall of the old roadbed, detecting the deflection of the original pavement, and drawing up the thickness of cement concrete sprayed on the retaining wall of the existing roadbed rubble blocks, and selecting the specification of a reinforcing mesh, a steel wire mesh and a layout mode;
Figure 465570DEST_PATH_IMAGE030
determining technical indexes of the used materials through tests;
(3) calculating the technical parameters of the integrated structure of the white-to-black road surface of the retaining wall by using a formula I, a formula II and a formula III, designing a construction drawing and providing a construction scheme;
step two, retaining wall reinforcement
Figure 322799DEST_PATH_IMAGE029
Carrying out measurement lofting according to a design drawing;
(2) removing 20-30 cm of the top of the existing roadbed block stone retaining wall, and cleaning a serious weathering layer of the block stone wall surface of the retaining wall;
(3) manufacturing or purchasing reinforcing steel bar meshes and detecting to be qualified, paving reinforcing steel bar meshes on the outer side and the top of the retaining wall, and fixing the reinforcing steel bar meshes on the outer side of the retaining wall and the top of the retaining wall after 20-30 cm of anchoring steel bar meshes are removed;
(4) preparing a sprayed cement concrete mixture, and passing the test;
(5) when a cement concrete protective layer is sprayed on the retaining wall, firstly, block stone gaps of the retaining wall are sprayed, the cement concrete sprayed at the gaps is inserted and tamped by a hand tool to be filled compactly, and then the whole wall surface is sprayed, wherein cement concrete is sprayed or poured after a reinforcing mesh is left at the top of the retaining wall and is welded with a steel wire mesh;
step three, constructing the base course of the original cement concrete pavement after the resonance rubblization
Figure 455840DEST_PATH_IMAGE029
Firstly, carrying out plate replacement treatment on the original cement concrete plate which is seriously broken and damaged, and carrying out resonance crushing when the strength of the cement concrete plate to be replaced and paved again reaches over 75 percent of the designed strength; carrying out resonance rubblization treatment on the original cement concrete plate needing plate replacement treatment and the original cement concrete plate not needing plate replacement treatment, wherein the cement concrete pavement after resonance breaking is used as a base layer of a surface layer;
(2) lofting the resonant operation paths before construction, and tightly connecting adjacent crushing paths;
Figure 100002_DEST_PATH_IMAGE031
the resonance crushing is carried out to-and-fro crushing according to a path parallel to the road trend, the crushing is not inclined, the vibration is not leaked, the crushing is repeated, the crushing is overlapped, and a section of test road section is arranged for carrying out the resonance test to obtain related data;
Figure 289673DEST_PATH_IMAGE032
according to the technological parameters determined in the test section, the construction technological parameters are reasonably finely adjusted by combining the difference of the road surface conditions of the construction road section, and the crushing effect is ensured to meet the crushing quality requirement of the crushed stone layer;
Figure 100002_DEST_PATH_IMAGE033
the crushed stone layer is sprayed with water and rolled with the water spraying amount of 1kg/m 2 ～3kg/m 2 (ii) a Rolling the crushed stone layer according to three stages of initial pressing, secondary pressing and final pressing, wherein rolling equipment adopts a steel wheel roller, a steel wheel vibration roller or a tyre roller, the rolling is performed in sequence from roadside to middle and from low to high, the width of the rolling wheel of which the width is not less than 1/3 of that of the adjacent rolling belt is overlapped during the rolling, and the technical indexes of the flatness and the compactness are qualified;
Figure 801557DEST_PATH_IMAGE034
the crushed stone layer is subjected to resonance crushing, subsequent construction is continuously carried out, the exposure time of the stone layer is not more than 3d, and the stone layer is not opened for traffic;
step four, laying steel wire mesh
Figure 78954DEST_PATH_IMAGE029
After being conveyed to the field, the steel wire mesh is lifted by a machine, lifted lightly and protected well, and the mesh surface of the steel wire mesh is prevented from being damaged due to manual throwing or rolling by a vehicle;
(2) the net surface of the steel wire net is completely unfolded and manually adjusted to a correct position, and each steel wire net is lapped according to the specification;
Figure 688839DEST_PATH_IMAGE031
before the steel wire mesh is laid and is not fixed, rolling for 1 to 2 times by using a rubber-tyred roller; after the synchronous gravel sealing layer is paved, rolling for 1-2 times by using a rubber-tyred roller again;
Figure 280357DEST_PATH_IMAGE032
the net surface of the steel wire net adopts M8 pressure explosion screw nails as anchoring steel nails, and is fixed by using a small-sized percussion drill, and the density of the anchoring steel nails is not less than 1/M 2 The positions of the net surface fixing end, the sharp bend section and the wheel track belt of the paver are properly encrypted to ensure that the net surface fixing end, the sharp bend section and the wheel track belt are tightly attached to the road surface;
Figure 36961DEST_PATH_IMAGE033
after the reinforcing mesh is laid and is checked to be qualified, synchronous gravel lower seal layer construction is carried out;
Figure 235992DEST_PATH_IMAGE034
the SBS modified asphalt for the synchronous chip seal has the dosage of 1.8g/m 2 ～2.0kg/m 2 The aggregate spreading amount is 13kg/m 2 ～15kg/m 2 The maximum grain size of the synchronous gravel seal graded aggregate is not more than 19mm;
step five, asphalt concrete construction
Figure 140363DEST_PATH_IMAGE029
The materials of the asphalt mixture meet the design requirements, sampling inspection is carried out in the mixing operation to verify that the composition and the mixing ratio of the asphalt mixture subjected to sampling inspection meet the design requirements;
(2) the synchronous broken stone seal layer is cleaned by adopting a road sweeper and a powerful blower, so that the surface is kept clean, dry and flat;
Figure 847157DEST_PATH_IMAGE031
the hot asphalt mixture is paved and rolled along the direction of the overlapped upper layer net and the lower layer net, and the construction process and the quality are ensured to meet the relevant standards and design requirements.
Compared with the prior art, the invention mainly provides a white-to-black road surface integrated structure of the existing road block stone retaining wall and a construction method, the white-to-black road surface integrated structure comprises the retaining wall of the original road bed, a drain pipe, a base layer filled with original cement concrete road surface after resonance rubblization, and a steel wire mesh and a surface layer which are sequentially laid on the base layer, meanwhile, the outer side and the top of the retaining wall are respectively provided with a steel bar mesh fixed by anchoring steel bars, and the steel bar mesh and the steel wire mesh on the base layer are mutually connected and sprayed with cement concrete to form an integrated structure. The invention has the following advantages: firstly, the original cement concrete pavement slab is crushed into a base layer by adopting a resonance rubblized base layer and a steel wire mesh laying process, so that the base layer is utilized in place, materials are saved, and energy conservation and emission reduction are realized; secondly, after the white-to-black modification, the bottom steel wire mesh of the surface layer of the asphalt concrete and the reinforcing steel bar mesh for reinforcing the retaining wall are mutually connected at the top of the retaining wall, when a vehicle runs on the surface layer, the bottom steel wire mesh of the surface layer is subjected to sedimentation and elongation to generate dynamic tension on the top of the retaining wall, disappears along with the separation of the vehicle, increases along with the increase of the weight and the quantity of the vehicle, has the opposite direction to the horizontal active soil pressure of the retaining wall, plays a role in dynamic self-stress balance, enhances the stability of the retaining wall structure, and effectively reduces the cross section area and the engineering quantity of the retaining wall; and thirdly, the provided calculation method is clear in principle, scientific, reasonable, practical and easy to implement, and can guide the integrated structural design and construction of the white-to-black road surface of the existing road block stone retaining wall so as to save cost and improve safety quality performance. Therefore, the invention is an integrated structure of changing white into black road surface of existing road block retaining wall with simple structure, economy and applicability, safety and reliability, energy conservation and emission reduction and dynamic self-stress balance, can better save energy and protect resources, embodies the idea of green energy-saving road engineering construction, combines with corresponding construction method, and has higher economic benefit, energy conservation and emission reduction benefit and social benefit.
Drawings
FIG. 1 is a schematic elevation view of the structure of the present invention.
Fig. 2 is a plan view of the arrangement of the wire mesh and the reinforcing mesh of fig. 1.
FIG. 3 is a road surface automobile load deflection diagram.
Fig. 4 is a graph of force calculation of the steel wire mesh.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings.
As shown in fig. 1 to 4, the retaining wall 1, the drainage pipe 11, the fill 2, the base layer 3, the surface layer 4, the deflection curve 41, the steel wire mesh 5, the distributed steel bars 51, the steel wire mesh deformation curve 52, the steel bar mesh 6, the anchoring steel bars 61, and the protective layer 7.
The white-to-black road surface integrated structure of the existing road bed block stone retaining wall and the construction method thereof comprise the retaining wall 1, a drain pipe 11, a filling 2 and a raw cement concrete pavement of the original road bed, wherein the raw cement concrete pavement forms a base layer 3 after resonance rubblization, and a steel wire mesh 5 and a surface layer 4 are sequentially laid on the base layer.
The outside and the top of the retaining wall 1 are provided with reinforcing mesh 6 fixed by anchoring reinforcing bars 61, and the reinforcing mesh and the steel mesh 5 on the base layer 3 are connected with each other and sprayed with cement concrete to form an integrated structure.
Retaining wall 1 for waiting to reform transform the mountain road subgrade stone masonry protective structure who promotes, through many years's use, the totality satisfies the service function, nevertheless there is the morals and manners disease in retaining wall 1's the surface that exposes, so need be consolidated with reinforcing bar net 6 and spray cement concrete.
The drainage pipe 11 is an original roadbed drainage facility, generally meets the use function, when the retaining wall 1 is reinforced by the reinforcing mesh 6 and the sprayed cement concrete, the retaining wall needs to be lengthened to discharge accumulated water, and the filling part 2 is a filling part of the original roadbed and generally meets the use function.
The base layer 3 is formed by crushing a raw cement concrete pavement through a resonance crusher, and because the raw cement concrete pavement has a plurality of diseases, high-frequency low-amplitude vibration energy is transmitted into a cement plate to be crushed through a crushing hammer head of the resonance crusher, the upper half part of the cement plate is in a granular fragment less than 10cm and is in a compact state from a relatively loose state; the lower half part of the plate is 10 cm-20 cm granular fragments which present an interlocking and occluding state, thereby reducing or avoiding reflection cracks on the asphalt concrete surface layer when the transformation from white to black is carried out, and the crushing operation of the resonance crusher needs not to damage the base layer 3, the roadbed and surrounding structural facilities.
The surface layer 4 is made of asphalt concrete, namely, a white original cement concrete pavement is reformed into a black asphalt concrete pavement.
The steel wire mesh is a hexagonal double-twisted metal wire mesh woven by antiseptic treated steel wires through a machine, the longitudinal lap joint width of the steel wire mesh is 20-30 cm, the transverse lap joint width of the steel wire mesh is 15-20 cm, the steel wire mesh is fixed on a base layer through anchoring steel nails, the anchoring steel nails adopt M8 compression explosion threaded nails, and the anchoring point intervals of the anchoring steel nails are 90-100 cm in the longitudinal direction and 70-80 cm in the transverse direction and are arranged in a quincunx shape; in unfavorable road sections such as curves and steep slopes, the anchoring points of the steel wire mesh 5 are encrypted to be 50-60 cm in the longitudinal direction and 40-50 cm in the transverse direction, the steel wire mesh 5 needs to be flattened by a road roller before being anchored, and the steel wire mesh 5 needs to be tensioned and flattened.
Wire net 5 in weave into many distributed steel bars 51 along the vertical certain interval of basic unit, simultaneously 1 distributed steel bar 51 is also respectively woven along vertical the both sides edge of basic unit, be favorable to surface course 4's wholeness and crack control nature, this distributed steel bar 51 is ordinary hot rolling round steel bar, be the distance of 1 or 2 hexagon meshes along the vertical interval of basic unit, distributed steel bar 51's diameter is greater than the steel wire diameter, 1 distributed steel bar every 2m ~ 3m disconnection and release stress that vertical each woven into is followed to basic unit both sides edge.
The reinforcing mesh 6 is a reinforcing mesh sheet formed by welding hot rolled steel bars, is used for preventing weathering damage on the exposed surface of the retaining wall 1 and enhancing the integrity of the block stone retaining wall 1, and can be used for reinforcing the retaining wall together with sprayed cement concrete; meanwhile, the reinforcing mesh 6 is welded with the steel wire mesh 5 at the top of the retaining wall 1, so that the road surface and the retaining wall 1 are integrally stressed together, and the reinforcing mesh 6 can also adopt the steel wire mesh 5 according to actual conditions.
The anchoring bar 61 is a hot rolled bar, and is mainly used for fixing the reinforcing mesh 6 with the outer side and the top of the retaining wall 1, and the anchoring bar 61 is inserted into the gap between two blocks of stones of the retaining wall 1 or drilled holes are inserted into the blocks of the outer side and the top of the retaining wall 1 and arranged in a quincunx shape.
The reinforcing mesh 6 and the steel wire mesh 5 on the base layer 3 are mutually connected and sprayed with cement concrete to form a protective layer 7 which can be used for protecting exposed surface weathering diseases of the retaining wall 1 and enhancing the integrity of the block stone retaining wall, the sprayed cement concrete protective layer is C30 and 8 cm-20 cm in thickness, the thickness of the protective layer of the reinforcing mesh is not less than 3cm, and the protective layer on the top of the retaining wall can also adopt cast-in-situ C30 cement concrete.
The surface layer 4 generates a deflection disc under the action of automobile load, and the deflection disc is arranged on the surface layerxoyThe planar deflection curve 41 is simulated using the Logistic equationThe Logistic deflection curve equation is
Figure 192687DEST_PATH_IMAGE001
Equation of deflection curve
Figure 93778DEST_PATH_IMAGE002
To wind aroundxoyPlane surfaceyThe shaft rotates for a circle to form a concave deflection basin, the compression deformation of the surface layer is neglected, the steel wire mesh deformation curve 52 and the surface layer 4 synchronously sink to form a Logistic deflection curve with the same shape, and the strength of the counterforce applied to the steel wire mesh settlement is the same as that of the counterforce applied to the steel wire mesh settlement according to the assumption of the Wencher foundation
Figure 95233DEST_PATH_IMAGE003
Then, the following calculation formula is obtained:
formula I,
Center of steel wire mesh deflection discOContact part of steel wire mesh and surface course side at top of retaining wallAAnd the middle point between two tire sets of the standard axle load of the automobileBRespectively is
Figure 825291DEST_PATH_IMAGE004
To do so byOOf originxoyEach undetermined parameter of the Logistic deflection curve equation in the plane and a related calculation formula are as follows:
Figure 805754DEST_PATH_IMAGE005
in the formula
Figure 923752DEST_PATH_IMAGE006
Thus, each undetermined parameter of Logistic deflection curve is obtained
Figure 225551DEST_PATH_IMAGE007
；
Figure 290459DEST_PATH_IMAGE008
The second formula,
Under the condition of single vehicle running, the contact part of the steel wire mesh 5 with the steel bar mesh 6 on the top of the retaining wall 1 is formed by the force balance principleATensile force and maximum deflection betweenORespectively at a tensile force of
Figure 859850DEST_PATH_IMAGE009
In the formula
Figure 86432DEST_PATH_IMAGE010
When a plurality of vehicles act simultaneously on the section of a pavement surface course 4, the contact part of the steel wire gauze 5 with unit width and the steel wire gauze 6 at the top of the retaining wall 1AAnd maximum deflectionOThe tension at the point is calculated according to the superposition principle:
the formula III,
Figure 62478DEST_PATH_IMAGE011
The steel wire mesh 5 at the bottom of the surface layer and the steel bar mesh 6 for reinforcing the retaining wall 1 are mutually connected at the top of the retaining wall, when a vehicle runs on the surface layer, the steel wire mesh 5 at the bottom of the surface layer 4 is settled and extended to generate tension on the top of the retaining wall 1, the tension is dynamic and disappears along with the leaving of the vehicle, the tension is increased along with the increase of the weight and the quantity of the vehicle, and the direction of the tension is opposite to the horizontal active soil pressure direction of the retaining wall 1, so that the dynamic self-stress balancing effect is realized, the stability of the retaining wall structure is enhanced, and the section area and the engineering quantity of the retaining wall 1 are effectively reduced;
the symbols in formula one, formula two and formula three are defined as:
Figure 416230DEST_PATH_IMAGE007
-fitting parameters of Logistic deflection curves respectively,
Figure 590860DEST_PATH_IMAGE012
no dimension, no dimension,
Figure 497330DEST_PATH_IMAGE013
；
Figure 22990DEST_PATH_IMAGE014
-a standard axle-borne single-circle radius of the automobile,
Figure 977170DEST_PATH_IMAGE012
；
Figure 537465DEST_PATH_IMAGE015
respectively from the standard axle-loaded single-circle center of the vehicle close to one side of the retaining wall 1 to the top of the retaining wallADistance between, standard axle load single circle center of automobileOIs positioned to the middle point between two standard axle load tyre groups of the automobileBThe distance between the two or more of the sensors,
Figure 89538DEST_PATH_IMAGE012
；
Figure 40176DEST_PATH_IMAGE002
the surface layer 4 generates a deflection plate under the action of the load of the automobile, and the deflection platexoyThe plane deflection curve (41) is simulated by using Logistic equation, and the deflection curve 41 equation is
Figure 984998DEST_PATH_IMAGE016
To bend and sink the basin
Figure 150531DEST_PATH_IMAGE002
Is wound with a curvexoyPlane surfaceyThe shaft rotates for a circle to form a concave deflection basin;
Figure 624238DEST_PATH_IMAGE017
-respectively are automobile standard axle load single-circle uniform distributionLoad strength, dead weight strength of surface layer material, counter force strength of steel wire mesh 5 settlement under the action of standard axle load single circle uniform load of an automobile,
Figure 170495DEST_PATH_IMAGE018
；
Figure 919008DEST_PATH_IMAGE019
the friction coefficient and the foundation reaction coefficient between the steel wire mesh 5 and the surface layer 4 and the base layer 3 respectively,
Figure 673469DEST_PATH_IMAGE020
obtained by looking up data or actually measuring, and has no dimension,
Figure 849235DEST_PATH_IMAGE021
；
Figure 508886DEST_PATH_IMAGE022
The steel wire mesh 5 and the top of the retaining wall 1 are respectively of unit widthAThe steel wire mesh 5 with unit width is arranged at the standard axle load single circle center of the automobileOThe tension of the steel wire mesh 5 and the allowable tension of the steel wire mesh,
Figure 44779DEST_PATH_IMAGE023
；
Figure 168593DEST_PATH_IMAGE024
respectively at any position after the steel wire mesh 5 is settled and deformedxIncluded angle of shaft, near the top of retaining wallAIs treated withxIncluded angle of shaft, standard axle load single circle center of automobileOIs treated withxIncluded angle of axle, middle point between two tyre groups of standard axle load of carBIs treated withxThe included angle of the axes is set by the angle,
Figure 265993DEST_PATH_IMAGE025
；
Figure 271995DEST_PATH_IMAGE026
the friction resistance stress between the steel wire mesh 5 and the surface layer 4 and the base layer 3,
Figure 617438DEST_PATH_IMAGE018
；
Figure 595758DEST_PATH_IMAGE027
-using standard automobile axle to carry single round bending sinking plate centerOAt the origin of coordinatesxA shaft,yThe shaft is provided with a plurality of axial holes,
Figure 864059DEST_PATH_IMAGE012
；
Figure 498303DEST_PATH_IMAGE028
-the number of coefficients is,
Figure 126730DEST_PATH_IMAGE023
。
in addition, a construction method of a white-to-black road surface integrated structure of the existing road block stone retaining wall mainly comprises the following steps:
step one, the integrated structural design of the white-to-black road surface of the retaining wall
Figure 208825DEST_PATH_IMAGE029
Investigating and analyzing the current situation and the bearing capacity of the retaining wall of the old roadbed, detecting the deflection of the original pavement, and drawing up the thickness of cement concrete sprayed on the retaining wall of the existing roadbed rubble blocks, and selecting the specifications of a reinforcing mesh 6 and a steel wire mesh 5 and the layout mode;
Figure 897295DEST_PATH_IMAGE030
determining technical indexes of the used materials through tests;
(3) calculating the technical parameters of the integrated structure of the white-to-black road surface of the retaining wall 1 by using a formula I, a formula II and a formula III, designing a construction drawing and providing a construction scheme;
step two, retaining wall reinforcement
Figure 628622DEST_PATH_IMAGE029
Carrying out measurement lofting according to a design drawing;
(2) removing 20-30 cm of the top of the existing retaining wall made of the roadbed rubbles, and cleaning a severe weathering layer of the wall face made of the roadbed rubbles;
(3) manufacturing or purchasing reinforcing steel bar meshes and detecting to be qualified, paving reinforcing steel bar meshes 6 on the outer side and the top of the retaining wall, and fixing the reinforcing steel bar meshes on the outer side of the retaining wall 1 and the top of the retaining wall after 20-30 cm removal by using anchoring reinforcing steel bars 61;
(4) preparing a sprayed cement concrete mixture, and passing the test;
(5) when a cement concrete protective layer is sprayed on the retaining wall, firstly, block stone gaps of the retaining wall 1 are sprayed, the cement concrete sprayed at the gaps is inserted and tamped by a hand tool to be filled compactly, and then the whole wall surface is sprayed, wherein the cement concrete is sprayed or poured after a reinforcing mesh 6 and a steel wire mesh 5 are left at the top of the retaining wall;
step three, constructing the base course of the original cement concrete pavement after the resonance rubblization
Figure 60740DEST_PATH_IMAGE029
Firstly, carrying out plate replacement treatment on the original cement concrete plate which is seriously broken and damaged, and carrying out resonance crushing when the strength of the cement concrete plate to be replaced and paved again reaches over 75 percent of the designed strength; carrying out resonance rubblization treatment on the original cement concrete plate needing plate replacement treatment and the original cement concrete plate not needing plate replacement treatment, wherein the cement concrete pavement after resonance breaking is used as a base layer 3 of a surface layer 4;
(2) before construction, lofting is carried out on the resonant operation paths, and adjacent crushing paths are closely connected;
Figure 528500DEST_PATH_IMAGE031
the resonance crushing is carried out to-and-fro crushing according to a path parallel to the road trend without inclining crushing, leaking vibration, repeated crushing and overlapping crushing,arranging a section of test road section to carry out resonance test to obtain related data;
Figure 122292DEST_PATH_IMAGE032
according to the technological parameters determined in the test section, the construction technological parameters are reasonably finely adjusted by combining the difference of the road surface conditions of the construction road section, and the crushing effect is ensured to meet the crushing quality requirement of the crushed stone layer;
Figure 465549DEST_PATH_IMAGE033
the crushed stone layer is sprayed with water and rolled with the water spraying amount of 1kg/m 2 ～3kg/m 2 (ii) a Rolling the crushed stone layer according to three stages of initial pressing, secondary pressing and final pressing, wherein rolling equipment adopts a steel wheel roller, a steel wheel vibration roller or a tire roller, the rolling is performed in sequence from roadside to middle and from low to high, when in rolling, the adjacent rolling belts are overlapped by not less than 1/3 of the width of the rolling wheel, and the technical indexes of flatness, compactness and the like are detected to be qualified;
Figure 186511DEST_PATH_IMAGE034
the crushed stone layer is subjected to resonance crushing, subsequent construction is continuously carried out, the exposure time of the stone layer is not more than 3d, and the stone layer is not opened for traffic;
step four, laying steel wire mesh
Figure 993930DEST_PATH_IMAGE029
After being conveyed to the field, the steel wire mesh 5 is hoisted by a machine, lightly lifted and lightly placed, and is well protected, so that the mesh surface of the steel wire mesh is prevented from being damaged due to manual throwing or vehicle rolling and the like;
(2) the net surface of the steel wire net 5 is completely unfolded and manually adjusted to a correct position, and each frame is lapped according to the specification;
Figure 273471DEST_PATH_IMAGE031
before the steel wire mesh 5 is laid and is not fixed, glue is adoptedRolling for 1-2 times by a wheel road roller; after the synchronous gravel sealing layer is paved, rolling for 1-2 times by using a rubber-tyred roller again;
Figure 228657DEST_PATH_IMAGE032
the net surface of the steel wire net 5 adopts M8 pressure explosion screw nails as anchoring steel nails which are fixed by equipment such as a small impact drill, and the density of the anchoring steel nails is not less than 1/M 2 The positions of the net surface fixing end, the sharp bending section and the wheel track belt of the paver are properly encrypted to ensure that the net surface fixing end, the sharp bending section and the wheel track belt are tightly attached to the road surface;
Figure 753310DEST_PATH_IMAGE033
after the reinforcing mesh 5 is laid and checked to be qualified, synchronous gravel lower seal layer construction is carried out;
Figure 680815DEST_PATH_IMAGE034
the SBS modified asphalt for the synchronous chip seal has the dosage of 1.8g/m 2 ～2.0kg/m 2 The amount of the aggregate spread is 13kg/m 2 ～15kg/m 2 The maximum grain size of the synchronous gravel seal graded aggregate is not more than 19mm;
step five, asphalt concrete construction
Figure 554093DEST_PATH_IMAGE029
The materials of the asphalt mixture meet the design requirements, sampling inspection is carried out in the mixing operation to verify that the composition and the mixing ratio of the asphalt mixture subjected to sampling inspection meet the design requirements;
(2) the synchronous broken stone seal layer is cleaned by adopting equipment such as a road sweeper, a powerful blower and the like, so that the surface is kept clean, dry and flat;
Figure 13605DEST_PATH_IMAGE031
the hot asphalt mixture is paved and rolled along the direction of the overlapped upper layer net and the lower layer net, and the construction process and the quality are ensured to meet the relevant standards and design requirements。
The examples of the present invention are provided for illustration only and are not intended to limit the scope of the present invention. It should also be understood that various changes or modifications may be made by those skilled in the art after reading the teachings herein, and such equivalents are intended to fall within the scope of the invention as defined in the appended claims.

Claims (10)

1. A white-to-black road surface integrated structure of an existing road bed block stone retaining wall comprises the retaining wall (1) of an original road bed, a drain pipe (11), a filling (2) and a raw cement concrete road surface, and is characterized in that the raw cement concrete road surface is subjected to resonance rubblization to form a base layer (3), and a steel wire mesh (5) and a surface layer (4) are sequentially laid on the base layer; the outside and the top of the retaining wall (1) are both provided with a reinforcing mesh (6) fixed by anchoring reinforcing steel bars (61), and the reinforcing mesh and a steel wire mesh (5) on the base layer (3) are connected with each other and sprayed with cement concrete to form an integrated structure.
2. The integrated structure of white-to-black road surface of existing retaining wall of roadbed block stone as claimed in claim 1, wherein said surface layer (4) is formed into a deflection plate under the action of vehicle load, and said deflection plate is formed into a curved platexoyThe plane deflection curve (41) is simulated by using Logistic equation which is
Figure 631622DEST_PATH_IMAGE001
Equation of deflection curve
Figure 928480DEST_PATH_IMAGE002
To wind aroundxoyPlane surfaceyThe shaft rotates for a circle to form a concave deflection basin, the compression deformation of the surface layer is ignored, the steel wire mesh deformation curve (52) and the surface layer (4) synchronously sink to form a Logistic deflection curve with the same shape, and the steel wire mesh settlement receives the counter force strength of the steel wire mesh settlement according to the assumption of the Wencherler foundation
Figure 300555DEST_PATH_IMAGE003
Then, the following calculation formula is obtained:
formula I,
Center of steel wire mesh deflection discOContact part of steel wire mesh and surface course side at top of retaining wallAAnd the middle point between two tire sets of the standard axle load of the automobileBRespectively is
Figure 184329DEST_PATH_IMAGE004
To do so byOOf originxoyEach undetermined parameter of the Logistic deflection curve equation in the plane and the related calculation formula are as follows:
Figure 300052DEST_PATH_IMAGE005
in the formula
Figure 451417DEST_PATH_IMAGE006
Thus, each undetermined parameter of Logistic deflection curve is obtained
Figure 994394DEST_PATH_IMAGE007
；
Figure 631043DEST_PATH_IMAGE008
The formula II,
Under the condition that a single automobile runs, according to the principle of force balance, the contact part of the steel wire mesh (5) with the steel bar mesh (6) on the top of the retaining wall (1) is arranged at the steel wire mesh with unit widthATensile force and maximum deflection betweenORespectively at a tensile force of
Figure DEST_PATH_IMAGE009
In the formula
Figure 596462DEST_PATH_IMAGE010
When a plurality of vehicles act simultaneously on the section of one pavement surface layer (4), the contact part of the steel wire mesh (5) with unit width and the steel bar mesh (6) at the top of the retaining wall (1)AAnd maximum deflectionOThe tension at the point is calculated according to the superposition principle:
the formula III,
Figure DEST_PATH_IMAGE011
The steel wire mesh (5) at the bottom of the surface layer (4) and the reinforcing steel bar mesh (6) for reinforcing the retaining wall are connected with each other at the top of the retaining wall, when a vehicle runs on the surface layer, the steel wire mesh (5) at the bottom of the surface layer (4) is settled and extended to generate a tension force on the top of the retaining wall (1), the tension force is dynamic, disappears along with the leaving of the vehicle, increases along with the increase of the weight and the number of the vehicle and is opposite to the horizontal active soil pressure direction of the retaining wall (1);
the symbols in formula one, formula two and formula three are defined as:
Figure 431694DEST_PATH_IMAGE007
-fitting parameters of Logistic deflection curves respectively,
Figure 145572DEST_PATH_IMAGE012
no dimension, no dimension,
Figure 988893DEST_PATH_IMAGE013
；
Figure 446419DEST_PATH_IMAGE014
-a standard axle-load single-circle radius of the vehicle,
Figure 73841DEST_PATH_IMAGE012
；
Figure 958620DEST_PATH_IMAGE015
respectively from the standard axle-loaded single-circle center of the automobile close to one side of the retaining wall (1) to the top of the retaining wallADistance between, standard axle load single circle center of automobileOTo the middle point between two standard axle-load tyre groups of the automobileBThe distance between the two or more of the sensors,
Figure 537238DEST_PATH_IMAGE012
；
Figure 798455DEST_PATH_IMAGE002
the surface layer (4) generates a deflection plate under the action of the load of the vehicle, the deflection platexoyThe plane deflection curve (41) is simulated by using Logistic equation, and the deflection curve (41) equation is
Figure 280383DEST_PATH_IMAGE016
To bend and sink the basin
Figure 336064DEST_PATH_IMAGE002
Is wound with a curvexoyPlane surfaceyThe shaft rotates for a circle to form a concave deflection basin;
Figure 401977DEST_PATH_IMAGE017
the strength of the standard single-circle uniform axle-load of the automobile, the self-weight strength of the surface layer material and the counter-force strength of the steel wire mesh (5) sedimentation under the action of the standard single-circle uniform axle-load of the automobile are respectively obtained,
Figure 466885DEST_PATH_IMAGE018
；
Figure 537741DEST_PATH_IMAGE019
the friction coefficient and the foundation reaction coefficient between the steel wire mesh (5) and the surface layer (4) and the base layer (3) respectively,
Figure 764323DEST_PATH_IMAGE020
obtained by looking up data or actually measuring, and has no dimension,
Figure 317533DEST_PATH_IMAGE021
；
Figure 920552DEST_PATH_IMAGE022
-steel wire mesh (5) and retaining wall (1) top each in unit widthAThe tension and unit width steel wire mesh (5) is arranged at the standard axle load single circle center of the automobileOThe tension of the steel wire mesh (5),
Figure 845914DEST_PATH_IMAGE023
；
Figure 774556DEST_PATH_IMAGE024
respectively at any position after the steel wire mesh (5) is settled and deformedxIncluded angle of shaft, near the top of retaining wallAIs treated withxIncluded angle of shaft, standard axle load single circle center of automobileOIs treated withxIncluded angle of axle, middle point between two tyre groups of standard axle load of carBIs treated withxThe included angle of the axes is set by the angle,
Figure 289763DEST_PATH_IMAGE025
；
Figure 962053DEST_PATH_IMAGE026
the friction stress between the steel wire mesh (5) and the surface layer (4) and the base layer (3),
Figure 7500DEST_PATH_IMAGE018
；
Figure 841464DEST_PATH_IMAGE027
-carrying the single round sinking disc center by the automobile standard shaftOAt the origin of coordinatesxA shaft,yThe shaft is provided with a plurality of axial holes,
Figure 369266DEST_PATH_IMAGE012
；
Figure 314088DEST_PATH_IMAGE028
-the number of coefficients is,
Figure 479622DEST_PATH_IMAGE023
。
3. the integrated structure of white-to-black road surface of existing retaining wall of roadbed blocks as claimed in claim 1, wherein the reinforcing mesh (6) and the steel mesh (5) on the base layer (3) are connected with each other and sprayed with cement concrete to form a protective layer (7), the thickness of the protective layer (7) is 8 cm-20 cm, the thickness of the protective layer of the reinforcing mesh (6) is not less than 3cm, and the protective layer on top of the retaining wall (1) is also cast-in-place C30 cement concrete.
4. The integrated structure of white-to-black road surface of existing road block stone retaining wall according to claim 3, wherein the reinforcing mesh (6) is a reinforcing mesh sheet formed by welding hot rolled reinforcing bars; the reinforcing mesh (6) and the steel mesh (5) on the top of the retaining wall (1) are welded into a whole, and the protective layer (7) and the surface layer (4) form an integrated structure to bear force together.
5. The integrated structure of white-to-black road surface of existing road block stone retaining wall according to claim 1, characterized in that the anchoring reinforcing bars (61) are hot rolled reinforcing bars; the reinforcing mesh (6) is fixed with the outer side and the top of the retaining wall (1) through anchoring reinforcing steel bars (61), and the anchoring reinforcing steel bars are inserted into block stone gaps of the retaining wall (1) or drilled holes are inserted into block stones of the retaining wall (1) and arranged in a quincunx shape.
6. The integrated structure of white-to-black road surface of existing road block stone retaining wall according to claim 1, characterized in that the steel wire mesh (5) is a hexagonal double-twisted metal mesh woven by antiseptic treated steel wires through a machine, the steel wire mesh (5) has a longitudinal lap width of 20cm to 30cm and a transverse lap width of 15cm to 20cm; a plurality of distributed reinforcing steel bars (51) are woven into the steel wire mesh (5) at certain intervals along the longitudinal direction of the base layer, and simultaneously, 1 distributed reinforcing steel bar (51) is woven into the edges of the two sides of the base layer along the longitudinal direction; the steel wire mesh (5) is fixed on the base layer through anchoring steel nails, and the anchoring points of the anchoring steel nails are longitudinally 90-100 cm or 50-60 cm and transversely 70-80 cm or 40-50 cm and are arranged in a quincunx shape.
7. The integrated structure of white to black road surface of an existing road bed block stone retaining wall according to claim 6, wherein the distributed reinforcing bars (51) are general hot rolled round reinforcing bars, the interval in the longitudinal direction of the base layer is 1 or 2 hexagonal meshes, and the 1 distributed reinforcing bars (51) respectively woven in the edges of both sides of the base layer in the longitudinal direction are broken every 2m to 3m and stress is released.
8. The integrated structure of white-to-black road surface of the existing retaining wall of road blocks according to claim 1, characterized in that the retaining wall (1) is a protective structure of the mountain road block and stone blocks to be improved; the surface layer (4) is a modified black asphalt concrete pavement.
9. The integrated structure of white-to-black road surface of an existing roadbed blockstone retaining wall according to claim 1, wherein the base layer (3) is formed by crushing a raw cement concrete road surface by a resonance crusher, and the upper half part of the base layer is made into compact granular fragments smaller than 10cm, and the lower half part of the base layer is made into interlocking and engaging granular fragments of 10 cm-20 cm.
10. A construction method of a white-to-black road surface integrated structure of an existing road block stone retaining wall according to any one of claims 1~9, which is characterized in that the construction method comprises the steps of:
step one, the integrated structural design of the white-to-black road surface of the retaining wall
Figure 484487DEST_PATH_IMAGE029
Investigating and analyzing the current situation and the bearing capacity of the retaining wall of the old roadbed, detecting the deflection of the original road surface, and drawing up the thickness of cement concrete sprayed on the retaining wall of the existing roadbed rubble blocks, and selecting the specifications of a reinforcing mesh and a steel wire mesh and the arrangement mode;
Figure 234006DEST_PATH_IMAGE030
determining technical indexes of the used materials through tests;
(3) calculating the technical parameters of the integrated structure of the white-to-black road surface of the retaining wall (1) by using a formula I, a formula II and a formula III, designing a construction drawing, and providing a construction scheme;
step two, retaining wall reinforcement
Figure 982519DEST_PATH_IMAGE029
Carrying out measurement lofting according to a design drawing;
(2) removing 20-30 cm of the top of the existing retaining wall made of the roadbed rubbles, and cleaning a severe weathering layer of the wall face made of the roadbed rubbles;
(3) manufacturing or purchasing reinforcing steel bar meshes and detecting to be qualified, paving reinforcing steel bar meshes (6) on the outer side and the top of the retaining wall, and fixing the reinforcing steel bar meshes on the outer side of the retaining wall (1) and the top of the retaining wall after 20-30 cm of reinforcing steel bar meshes are removed by using anchoring reinforcing steel bars (61);
(4) preparing a sprayed cement concrete mixture, and passing the test;
(5) when a cement concrete protective layer is sprayed on the retaining wall, firstly, block stone gaps of the retaining wall are sprayed, cement concrete sprayed at the gaps is inserted and tamped by a hand tool to be filled compactly, and then the whole wall surface is sprayed, wherein cement concrete is sprayed or poured after a reinforcing mesh (6) and a steel wire mesh (5) are welded at the top of the retaining wall;
step three, constructing the base course of the original cement concrete pavement after the resonance rubblization
Figure 268138DEST_PATH_IMAGE029
Firstly, carrying out plate replacement treatment on the original cement concrete plate which is seriously broken and damaged, and carrying out resonance crushing when the strength of the cement concrete plate to be replaced and paved again reaches over 75 percent of the designed strength; carrying out resonance rubblization treatment on the original cement concrete plate needing plate replacement treatment and the original cement concrete plate not needing plate replacement treatment, wherein the cement concrete pavement after resonance breaking is used as a base layer (3) of a surface layer (4);
(2) before construction, lofting is carried out on the resonant operation paths, and adjacent crushing paths are closely connected;
Figure DEST_PATH_IMAGE031
the resonance crushing is carried out to-and-fro crushing according to a path parallel to the road trend, the crushing is not inclined, the vibration is not leaked, the crushing is repeated, the crushing is overlapped, and a section of test road section is arranged for carrying out the resonance test to obtain related data;
Figure 489910DEST_PATH_IMAGE032
according to the technological parameters determined in the test section, the construction technological parameters are reasonably finely adjusted by combining the difference of the road surface conditions of the construction road section, and the crushing effect is ensured to meet the crushing quality requirement of the crushed stone layer;
Figure DEST_PATH_IMAGE033
the crushed stone layer is sprayed with water and rolled with the water spraying amount of 1kg/m 2 ～3kg/m 2 (ii) a Rolling the crushed stone layer according to three stages of initial pressing, secondary pressing and final pressing, wherein rolling equipment adopts a steel wheel roller, a steel wheel vibration roller or a tire roller, the rolling is performed in sequence from roadside to middle and from low to high, when in rolling, the adjacent rolling belts are overlapped by not less than 1/3 of the width of the rolling wheel, and the technical indexes of flatness and compactness are detected to be qualified;
Figure 759348DEST_PATH_IMAGE034
the crushed stone layer is subjected to resonance crushing, subsequent construction is continuously carried out, the exposure time of the stone layer is not more than 3d, and the stone layer is not opened for traffic;
step four, laying steel wire mesh
Figure 45973DEST_PATH_IMAGE029
After being conveyed to the field, the steel wire mesh (5) is lifted by a machine, is lightly lifted and lightly placed, is well protected, and prevents the mesh surface of the steel wire mesh from being damaged due to manual throwing or vehicle rolling;
(2) the net surface of the steel wire net (5) is completely unfolded and manually adjusted to a correct position, and each frame is lapped according to the specification;
Figure 678774DEST_PATH_IMAGE031
before the steel wire mesh (5) is laid and is not fixed, rolling for 1 to 2 times by using a rubber-tyred roller; after the synchronous gravel sealing layer is paved, rolling for 1-2 times by using a rubber-tyred roller again;
Figure 25442DEST_PATH_IMAGE032
the net surface of the steel wire net (5) adopts M8 pressure explosion screw nails as anchoring steel nails, and is fixed by using a small-sized percussion drill, and the density of the anchoring steel nails is not less than 1/M 2 Fixing end of net surface, sharp bending section and pavingThe position of the wheel track belt is properly encrypted to ensure that the wheel track belt is tightly attached to the road surface;
Figure 251018DEST_PATH_IMAGE033
after the reinforcing mesh is laid and is checked to be qualified, synchronous gravel lower seal layer construction is carried out;
Figure 341334DEST_PATH_IMAGE034
the SBS modified asphalt for the synchronous chip seal has the dosage of 1.8g/m 2 ～2.0kg/m 2 The amount of the aggregate spread is 13kg/m 2 ～15kg/m 2 The maximum grain size of the synchronous gravel seal graded aggregate is not more than 19mm;
step five, asphalt concrete construction
Figure 568922DEST_PATH_IMAGE029
The materials of the asphalt mixture meet the design requirements, sampling inspection is carried out in the mixing operation to verify that the composition and the mixing ratio of the asphalt mixture subjected to sampling inspection meet the design requirements;
(2) the synchronous broken stone seal layer is cleaned by adopting a road sweeper and a powerful blower, so that the surface is kept clean, dry and flat;
Figure 86491DEST_PATH_IMAGE031
the hot asphalt mixture is paved and rolled along the direction of the overlapped upper layer net and the lower layer net, and the construction process and the quality are ensured to meet the relevant standards and design requirements.
CN202211169154.4A 2022-09-26 2022-09-26 Integrated structure of white-to-black road surface of existing road bed block stone retaining wall and construction method Pending CN115478458A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116240801A (en) * 2023-04-24 2023-06-09 安徽省交通控股集团有限公司 Rail type deformation isolation layer and seamless pile plate type road based on same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116240801A (en) * 2023-04-24 2023-06-09 安徽省交通控股集团有限公司 Rail type deformation isolation layer and seamless pile plate type road based on same

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