CN117005260A - Concrete pavement repairing construction method based on convex structure - Google Patents
Concrete pavement repairing construction method based on convex structure Download PDFInfo
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- CN117005260A CN117005260A CN202310991938.3A CN202310991938A CN117005260A CN 117005260 A CN117005260 A CN 117005260A CN 202310991938 A CN202310991938 A CN 202310991938A CN 117005260 A CN117005260 A CN 117005260A
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- 239000004567 concrete Substances 0.000 title claims abstract description 68
- 238000010276 construction Methods 0.000 title claims abstract description 19
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 27
- 230000008439 repair process Effects 0.000 claims abstract description 23
- 238000002955 isolation Methods 0.000 claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 17
- 239000004744 fabric Substances 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 70
- 230000009471 action Effects 0.000 abstract description 6
- 238000005086 pumping Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 239000004746 geotextile Substances 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000009991 scouring Methods 0.000 abstract description 2
- 239000004575 stone Substances 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 description 15
- 230000007704 transition Effects 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete 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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/147—Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a concrete pavement repairing construction method based on a convex structure, which is provided with a convex pit structure, so that the interlayer contact state of the area except for the joint of a new concrete panel and an old concrete panel is effectively improved, the stress characteristics of the joint area of the new board and the old board of a cement pavement are effectively improved under the action of heavy load and environmental coupling, the load transmission capacity mechanism between the new board and the old board of the cement pavement repairing is effectively improved, and the water scouring effect of a base layer caused by pumping effect caused by dynamic load is eliminated at the joint position; by arranging the composite isolation layer and wrapping the waterproof film layer by using double geotextile, the defect that the waterproof layer is poor in anti-broken stone or sharp object puncture capability can be effectively solved, and the integrity of the geomembrane below the pavement is ensured; after the repair is enhanced by the dowel bar reinforcing rib composite component, the stress transfer efficiency of the repaired plate and the adjacent old plate is enhanced, and the stress concentration state of the joint is improved.
Description
Technical Field
The invention belongs to the technical field of highway engineering concrete pavement damage maintenance, and particularly relates to a concrete pavement repair construction method based on a convex structure.
Background
The current concrete pavement repair mainly adopts a mode of scribing, cutting, chiseling broken concrete and pouring repair concrete, the contact state of the concrete pavement in the repair area and the roadbed is not treated, and meanwhile, the joint of the new and old concrete panels is not treated, the treatment mode does not accord with the design theory of a small deflection thin plate on the elastic half-space foundation of the cement concrete pavement in China, it is assumed that the surface layer and the base layer are in vertical continuous smooth contact, namely the contact surface of the panel and the base layer is always consistent in the deformation process, the vertical displacement of the panel and the base layer is equal, and no friction resistance exists on the contact surface of the panel and the base layer.
When the concrete surface layer is repaired and paved on the prior cement concrete pavement, cement slurry permeates into the base layer through the base layer cracks, a transition layer with weaker strength is formed between the base layer and the surface layer, and the transition layer enables a high friction effect to exist between the base layer and the cement concrete surface layer. The bottom of the joint of the new concrete and the old concrete is used as a weak area, stress concentration is generated under the conditions of repeated action of heavy load traffic, buckling stress generated by temperature or humidity gradient or shrinkage stress and other factors, the bottom of the slab is subjected to bending and stretching stress, cracks are generated due to the stress concentration, at the moment that the cracks penetrate through the slab, the tensile stress of the concrete slab near the two ends of the cracks is completely released, the concrete slab is just like a tensioned spring suddenly broken, huge restoring force is generated by the concrete slab to enable the surface layer to retract, and the suddenly generated restoring force is very huge. Because the transition layer bonds the surface layer and the base layer into a whole, the base layer can prevent the restoring movement, and a huge shearing force is necessarily generated near the connecting interface, the shearing force can quickly lead the interface between the surface layer and the base layer to form a crack in the horizontal direction, and the crack can lead the surface layer and the base layer to be separated along the transition layer, so that a separation interface is generated;
after the interlayer transition layer is crushed, the crushed layer can expand unevenly, so that uneven void of the pavement is aggravated, and the bearing capacity of the pavement is reduced; after water enters the interface between the surface layer and the base layer along the road surface joint or crack, the joint position generates a pumping action under the impact action of the vehicle load, and the scouring and emptying of the broken layer can be caused, so that the contact condition of the surface layer and the base layer is further deteriorated, the damage speed of the cement concrete pavement repair structure is increased, the service life of the cement concrete pavement repair structure is shortened, and the repair effect is poor.
In view of the above technical problems, there is a need to design a concrete pavement repair construction method based on a convex structure.
Disclosure of Invention
The invention aims to provide a concrete pavement repairing construction method based on a convex structure, which aims to solve the problem that a cement concrete pavement repairing structure is easy to produce secondary damage.
In order to achieve the above object, the present invention provides the following solutions:
the concrete pavement repairing construction method based on the convex structure comprises the following steps of;
firstly, cutting and breaking a damaged cement concrete pavement, and excavating downwards to the top of a roadbed along the damaged cement concrete pavement to form a convex pit;
tamping the convex pit, and leveling the bottom of the convex pit by using mortar; after leveling, pre-burying a pressure box in the convex pit;
paving a composite isolation layer, wherein the composite isolation layer is paved above the pre-buried pressure box, and two sides of the composite isolation layer are respectively and tightly adhered to the roadbed at the edge of the convex pit;
drilling holes in the cutting surface of the cement concrete pavement, and installing dowel bar reinforcing rib composite assemblies in the drilled holes; the dowel bar reinforcing rib composite assembly is arranged above the composite isolation layer;
reserving a grouting pipe in the convex pit groove, and communicating a grouting outlet of the grouting pipe with an elastic grouting bag; placing the elastic grouting bag in the convex pit groove cavity, and inflating the elastic grouting bag to enable the elastic grouting bag to fully cover the top area of the roadbed;
installing a prefabricated panel above the elastic grouting bag, and performing preliminary grouting into the elastic grouting bag through a reserved grouting pipe according to the feedback pre-buried pressure of the pre-buried pressure box;
and seventhly, observing pressure feedback of the embedded pressure box after the primary grouting material is hardened, and re-grouting the elastic grouting bag if the feedback pressure is reduced and stable and unchanged.
In the first step, the digging depth is larger than the thickness of the prefabricated panel and smaller than +5cm of the thickness of the prefabricated panel.
The convex pit comprises a damaged concrete pavement, a chiseling part at the top of the roadbed and an extension cavity; the extended cavity is formed by extending the chiseling part on the top surface of the roadbed to two sides of the non-broken damaged concrete pavement; the two extension cavities are perpendicular to the driving direction; the extension length of the extension cavity is more than 0.5m and less than 1m.
The pressure boxes are respectively arranged at the bottom surface center of the chiseling part at the top of the roadbed, the bottom surface center of the extending cavity, the edge corner of the chiseling part at the top of the roadbed and the edge corner of the chiseling part at the top of the extending cavity, which is close to the roadbed.
In the third step, the composite isolation layer sequentially comprises a lower geotechnical cloth layer, a waterproof film layer and an upper geotechnical cloth layer from bottom to top; the lower geotechnical cloth layer is laid on the bottom surface of the convex pit after leveling.
In the fourth step, the dowel bar and reinforcing rib composite assembly comprises dowel bars and reinforcing ribs; the dowel bar is of a U-shaped structure; one end of the dowel bar is inserted into the drill hole in the cutting surface of the cement concrete pavement, the other end of the dowel bar extends into the extension cavity, and the end part of the dowel bar is tightly attached to the top surface of the upper geotechnical cloth layer;
the dowel bars are horizontally arranged and have the same installation direction as the driving direction; the dowel bars are connected through the reinforcing ribs.
In the fifth step, the grouting pipe grout outlet faces to the extension cavity; two grouting openings and an inflation inlet are formed in the elastic grouting bag, and the grouting openings are communicated with the grouting pipe; and inflating the inflation inlet of the elastic grouting bag until the gap of the extension cavity is fully filled by the elastic grouting bag.
The outer surface of the elastic grouting bag is provided with a reticular pipeline, and pipe holes are uniformly distributed in the reticular pipeline; the grouting device is characterized in that the elastic grouting bag is further provided with a grouting opening communicated with the mesh pipeline, and the grouting opening communicated with the mesh pipeline is used for grouting materials to the mesh pipeline and releasing the grouting materials through uniformly distributed pipe holes, so that gaps between the elastic grouting bag and the base layer are filled.
In the sixth step, preliminary grouting is to grouting the inside of the elastic grouting bag, one grouting opening is opened, the other grouting opening is kept closed, pressurized grouting is carried out through the opened grouting opening, and grouting pressure is greater than the pressure of the embedded pressure box of the measured extension cavity and is not more than 10%; and when grouting is nearly completed, maintaining grouting pressure, observing the pressure measured by the pressure box in the extended cavity area, and if the measured pressure is stable and has no obvious change, continuing to maintain the grouting pressure for 2 minutes, and closing a grouting port valve to avoid pressure drop.
Compared with the prior art, the invention has the following advantages and technical effects: (1) Through setting up protruding type pit slot repair structure, except effectively improve the interlaminar contact state in the region beyond the new old concrete panel seam, simultaneously under heavy load and environment coupling effect, effectively improve the atress characteristic in the new old board seam region of cement road surface, cement road surface repair new board and old board between the mechanism of carrying the load effectively improves, compare with conventional concrete road surface pit slot repair, through extension compound isolation layer lay length, when the concentrated load of vehicle acts on seam department, new old panel synergism, the strengthening rib of board bottom and compound isolation layer can effectively disperse stress, the board bottom flexural tensile stress decline, the phenomenon of stress concentration is effectively improved.
(2) Through setting up compound isolation layer, use double-deck geotechnique cloth package to press from both sides waterproof film layer, can effectively solve the waterproof layer and resist the defect that rubble or sharp object puncture ability is poor, guarantee the integrality of geomembrane below the road surface. Meanwhile, when cracks are generated at the surface layer or the joint, the waterproof film layer in the composite isolation layer can prevent water from flowing into the base layer, so that pumping and mud pumping phenomena of the pavement slab can be prevented under the action of running load, dislocation of the joint and plate void are prevented, and the service life of the cement concrete pavement repair structure is prolonged.
(3) The composite isolating layer is arranged between the surface layer and the base layer, so that the interlayer contact state of the surface layer and the semi-rigid (or rigid) base layer is improved, the surface layer and the base layer are in vertical continuous smooth contact, and when the concrete panel bears load, the concrete panel has the outstanding characteristics of good integrity and uniform external load dispersion on the base layer due to integral stress.
Drawings
For a clearer description of an embodiment of the invention or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:
FIG. 1 is an overall flow diagram;
FIG. 2 is a schematic cross-sectional view of the overall structure;
FIG. 3 is a schematic diagram of an installation arrangement of pre-buried pressure boxes;
fig. 4 is a schematic structural view of the elastic grouting bag.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The concrete pavement repairing construction method based on the convex structure comprises the following steps of;
firstly, cutting and breaking a damaged cement concrete pavement, and excavating downwards to the top of a roadbed along the damaged cement concrete pavement to form a convex pit;
tamping the convex pit, and leveling the bottom of the convex pit by using mortar; after leveling, pre-burying a pressure box in the convex pit;
paving a composite isolation layer, wherein the composite isolation layer is paved above the pre-buried pressure box, and two sides of the composite isolation layer are respectively and tightly adhered to the roadbed at the edge of the convex pit;
drilling holes in the cutting surface of the cement concrete pavement, and installing dowel bar reinforcing rib composite assemblies in the drilled holes; the dowel bar reinforcing rib composite assembly is arranged above the composite isolation layer;
reserving a grouting pipe in the convex pit groove, and communicating a grouting outlet of the grouting pipe with an elastic grouting bag; placing the elastic grouting bag in the convex pit groove cavity, and inflating the elastic grouting bag to enable the elastic grouting bag to fully cover the top area of the roadbed;
installing a prefabricated panel above the elastic grouting bag, and performing preliminary grouting into the elastic grouting bag through a reserved grouting pipe according to the feedback pre-buried pressure of the pre-buried pressure box;
and seventhly, observing pressure feedback of the embedded pressure box after the primary grouting material is hardened, and re-grouting the elastic grouting bag if the feedback pressure is reduced and stable and unchanged.
In one embodiment of the invention, in the second step, the rough surface appears after the top surface of the base layer is partially chiseled, and mortar is used for leveling the rough top surface of the base layer and forming a leveling layer.
In the first step, the digging depth is larger than the thickness of the prefabricated panel and smaller than +5cm of the thickness of the prefabricated panel.
The convex pit comprises a damaged concrete pavement, a chiseling part at the top of the roadbed and an extension cavity; the extended cavity is formed by extending the chiseling part on the top surface of the roadbed to two sides of the non-broken damaged concrete pavement; the two extension cavities are perpendicular to the driving direction; the extension length of the extension cavity is more than 0.5m and less than 1m.
In one embodiment of the invention, the extension cavity extends into the cut surface of the damaged cement concrete pavement, and the actual length of the extension cavity is determined according to the extension length of the stress damage crack generated in the cutting process of the undamaged concrete pavement during cutting.
The pressure boxes are respectively arranged at the bottom surface center of the chiseling part at the top of the roadbed, the bottom surface center of the extending cavity, the edge corner of the chiseling part at the top of the roadbed and the edge corner of the chiseling part at the top of the extending cavity, which is close to the roadbed.
In the third step, the composite isolation layer sequentially comprises a lower geotechnical cloth layer, a waterproof film layer and an upper geotechnical cloth layer from bottom to top; the lower geotechnical cloth layer is laid on the bottom surface of the convex pit after leveling.
In one embodiment of the invention, the composite isolation layer uses double geotextile to sandwich the waterproof film layer, so that the defect of poor anti-broken stone or sharp object puncture capability of the waterproof layer can be effectively overcome, and the integrity of the geomembrane below the pavement is ensured. Meanwhile, when cracks are generated at the surface layer or the joint, the waterproof film layer in the composite isolation layer can prevent water from flowing into the base layer, so that pumping and mud pumping phenomena of the pavement slab can be prevented under the action of running load, dislocation of the joint and plate void are prevented, and the service life of the cement concrete pavement repair structure is prolonged.
In the fourth step, the dowel bar and reinforcing rib composite assembly comprises dowel bars and reinforcing ribs; the dowel bar is of a U-shaped structure; one end of the dowel bar is inserted into the drill hole in the cutting surface of the cement concrete pavement, the other end of the dowel bar extends into the extension cavity, and the end part of the dowel bar is tightly attached to the top surface of the upper geotechnical cloth layer;
the dowel bars are horizontally arranged and have the same installation direction as the driving direction; the dowel bars are connected through the reinforcing ribs.
In one embodiment of the invention the arrangement density of the dowel bars provided at the edge of the extension chamber is relatively high.
Further, the dowel bars are connected into a whole through the reinforcing ribs, and the reinforcing ribs are respectively arranged at the end parts of the dowel bars in the roadbed, and the two U-shaped connecting joints and other areas needing to be reinforced.
In the fifth step, the grouting pipe grout outlet faces to the extension cavity; two grouting openings and an inflation inlet are formed in the elastic grouting bag, and the grouting openings are communicated with the grouting pipe; and inflating the inflation inlet of the elastic grouting bag until the gap of the extension cavity is fully filled by the elastic grouting bag.
The outer surface of the elastic grouting bag is provided with a reticular pipeline, and pipe holes are uniformly distributed in the reticular pipeline; the grouting device is characterized in that the elastic grouting bag is further provided with a grouting opening communicated with the mesh pipeline, and the grouting opening communicated with the mesh pipeline is used for grouting materials to the mesh pipeline and releasing the grouting materials through uniformly distributed pipe holes, so that gaps between the elastic grouting bag and the base layer are filled.
In the sixth step, preliminary grouting is to grouting the inside of the elastic grouting bag, one grouting opening is opened, the other grouting opening is kept closed, pressurized grouting is carried out through the opened grouting opening, and grouting pressure is greater than the pressure of the embedded pressure box of the measured extension cavity and is not more than 10%; and when grouting is nearly completed, maintaining grouting pressure, observing the pressure measured by the pressure box in the extended cavity area, and if the measured pressure is stable and has no obvious change, continuing to maintain the grouting pressure for 2 minutes, and closing a grouting port valve to avoid pressure drop.
In one embodiment of the invention, in the fifth step, the extension cavity area is leveled, impurities such as scum on the joint surface are cleaned, the extension cavity area is kept clean and tidy, before concrete pouring is carried out, the elastic grouting bags are pre-inflated through the inflation openings of the elastic grouting bags, two elastic grouting openings are arranged, the valve switch of one grouting opening is closed, the other grouting opening is inflated, the extension cavity area is supported, and the valve of the connecting opening is closed.
After the inflation is completed, concrete is poured, after the concrete is hardened, grouting is carried out in the elastic grouting bag, when grouting is carried out in the elastic grouting bag, two grouting openings are formed, one grouting opening is connected with the grouting pipe, the other grouting opening is opened, the equal slurry enters from the grouting pipe, after the grouting bag is filled, the grouting opening from which the slurry flows out is closed after the grouting bag flows out from the other grouting pipe, and then the grouting opening is kept pressed for 2min.
Further, in the sixth step, according to the mix proportion of the repairing material, the original concrete pavement slab length, slab width, slab thickness and other three dimensions, casting prefabricated slabs with the same dimensions and the same mix proportion on an empty site, wherein the prefabricated slabs are used for determining grouting pressure, only one prefabricated slab is required to be prepared, the prefabricated slabs hardened to the corresponding strength level are hoisted to a repairing area, the pressure of the pre-buried pressure boxes arranged on the top surface of the roadbed and the pressure of the pre-buried pressure boxes at the corner positions are collected after the prefabricated slabs are installed and leveled, and the prefabricated slabs are hoisted out after the pressure collection is completed. The step is only needed to be carried out once, the obtained grouting pressure can be used for different pile numbers of different subsequent segments, and the pre-buried pressure boxes in the repairing area do not need to be laid continuously.
Furthermore, in the process of collecting pressure, a dowel bar is not installed, otherwise, the prefabricated panel cannot be placed; and (5) lifting out after the equal pressure acquisition is completed, releasing the force transmission rod, and then constructing according to the normal working procedures.
Pouring a repairing material in the residual construction range, wherein the repairing material is a micro-expansion high-crack-resistance cement-based rapid repairing material, after the repairing material is hardened, performing primary grouting in the extended cavity area according to the pressure of the pressure box in the central area and the pressure box in the corner area, performing primary grouting to perform grouting into an elastic grouting bag, opening one of two grouting openings for completely closing an interface valve, and keeping the other one closed, performing pressurized grouting by opening the valve grouting opening 1, wherein the grouting pressure is larger than the pressure of the pre-buried pressure box in the repairing area and is not more than 10%. And when grouting is nearly completed, maintaining grouting pressure, observing the pressure measured by the pressure box in the extended cavity area, and if the measured pressure is stable and has no obvious change, continuing to maintain the grouting pressure for 2 minutes, and closing a grouting port valve to avoid pressure drop.
More specifically, after the grouting is completed in the elastic grouting bag, the grouting is performed through the reticular pipeline after the material in the elastic grouting bag is coagulated and solidified, the grouting principle is the same as that of the grouting in the elastic grouting bag, the reticular pipeline is arranged on the outer surface of the elastic grouting bag, and the grouting ports communicated with the reticular pipeline are used for injecting the grouting material into the reticular pipeline and releasing the grouting material through uniformly distributed pipe holes, so that gaps between the elastic grouting bag and the base layer are filled.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (9)
1. The concrete pavement repairing construction method based on the convex structure is characterized by comprising the following steps of;
firstly, cutting and breaking a damaged cement concrete pavement, and excavating downwards to the top of a roadbed along the damaged cement concrete pavement to form a convex pit;
tamping the convex pit, and leveling the bottom of the convex pit by using mortar; after leveling, pre-burying a pressure box in the convex pit;
paving a composite isolation layer, wherein the composite isolation layer is paved above the pre-buried pressure box, and two sides of the composite isolation layer are respectively and tightly adhered to the roadbed at the edge of the convex pit;
drilling holes in the cutting surface of the cement concrete pavement, and installing dowel bar reinforcing rib composite assemblies in the drilled holes; the dowel bar reinforcing rib composite assembly is arranged above the composite isolation layer;
reserving a grouting pipe in the convex pit groove, and communicating a grouting outlet of the grouting pipe with an elastic grouting bag; placing the elastic grouting bag in the convex pit groove cavity, and inflating the elastic grouting bag to enable the elastic grouting bag to be fully supported in the top area of the cavity roadbed;
installing a prefabricated panel above the elastic grouting bag, and performing preliminary grouting into the elastic grouting bag through a reserved grouting pipe according to the feedback pre-buried pressure of the pre-buried pressure box;
and seventhly, observing pressure feedback of the embedded pressure box after the primary grouting material is hardened, and re-grouting the elastic grouting bag if the feedback pressure is reduced and stable and unchanged.
2. The concrete pavement repair construction method based on the convex structure according to claim 1, wherein: in the first step, the digging depth is larger than the thickness of the prefabricated panel and smaller than +5cm of the thickness of the prefabricated panel.
3. The concrete pavement repair construction method based on the convex structure according to claim 1, wherein: the convex pit comprises a damaged concrete pavement, a chiseling part at the top of the roadbed and an extension cavity; the extended cavity is formed by extending the chiseling part on the top surface of the roadbed to two sides of the non-broken damaged concrete pavement; the two extension cavities are perpendicular to the driving direction; the extension length of the extension cavity is more than 0.5m and less than 1m.
4. The concrete pavement repair construction method based on the convex structure according to claim 3, wherein: the pressure boxes are respectively arranged at the bottom surface center of the chiseling part at the top of the roadbed, the bottom surface center of the extending cavity, the edge corner of the chiseling part at the top of the roadbed and the edge corner of the chiseling part at the top of the extending cavity, which is close to the roadbed.
5. The concrete pavement repair construction method based on the convex structure according to claim 1, wherein: in the third step, the composite isolation layer sequentially comprises a lower geotechnical cloth layer, a waterproof film layer and an upper geotechnical cloth layer from bottom to top; the lower geotechnical cloth layer is laid on the bottom surface of the convex pit after leveling.
6. The concrete pavement repair construction method based on the convex structure according to claim 3, wherein: in the fourth step, the dowel bar and reinforcing rib composite assembly comprises dowel bars and reinforcing ribs; the dowel bar is of a U-shaped structure; one end of the dowel bar is inserted into the drill hole in the cutting surface of the cement concrete pavement, the other end of the dowel bar extends into the extension cavity, and the end part of the dowel bar is tightly attached to the top surface of the upper geotechnical cloth layer;
the dowel bars are horizontally arranged and have the same installation direction as the driving direction; the dowel bars are connected through the reinforcing ribs.
7. The concrete pavement repair construction method based on the convex structure according to claim 3, wherein: in the fifth step, the grouting pipe grout outlet faces to the extension cavity; two grouting openings and an inflation inlet are formed in the elastic grouting bag, and the grouting openings are communicated with the grouting pipe; and inflating the inflation inlet of the elastic grouting bag until the gap of the extension cavity is fully filled by the elastic grouting bag.
8. The concrete pavement repair construction method based on the convex structure according to claim 1, wherein: the outer surface of the elastic grouting bag is provided with a reticular pipeline, and pipe holes are uniformly distributed in the reticular pipeline; the grouting device is characterized in that the elastic grouting bag is further provided with a grouting opening communicated with the mesh pipeline, and the grouting opening communicated with the mesh pipeline is used for grouting materials to the mesh pipeline and releasing the grouting materials through uniformly distributed pipe holes, so that gaps between the elastic grouting bag and the base layer are filled.
9. The concrete pavement repair construction method based on the convex structure according to claim 7, wherein the concrete pavement repair construction method is characterized in that: in the sixth step, preliminary grouting is to grouting the inside of the elastic grouting bag, one grouting opening is opened, the other grouting opening is kept closed, pressurized grouting is carried out through the opened grouting opening, and grouting pressure is greater than the pressure of the embedded pressure box of the measured extension cavity and is not more than 10%; and when grouting is nearly completed, maintaining grouting pressure, observing the pressure measured by the pressure box in the extended cavity area, and if the measured pressure is stable and has no obvious change, continuing to maintain the grouting pressure for 2 minutes, and closing a grouting port valve to avoid pressure drop.
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