CN117051640A - Structural combination design optimization method for repairing cement pavement - Google Patents
Structural combination design optimization method for repairing cement pavement Download PDFInfo
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- CN117051640A CN117051640A CN202310815586.6A CN202310815586A CN117051640A CN 117051640 A CN117051640 A CN 117051640A CN 202310815586 A CN202310815586 A CN 202310815586A CN 117051640 A CN117051640 A CN 117051640A
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- 239000004568 cement Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000013461 design Methods 0.000 title claims abstract description 24
- 238000005457 optimization Methods 0.000 title claims abstract description 14
- 239000004567 concrete Substances 0.000 claims abstract description 53
- 239000010410 layer Substances 0.000 claims description 169
- 239000002131 composite material Substances 0.000 claims description 44
- 238000002955 isolation Methods 0.000 claims description 38
- 230000003014 reinforcing effect Effects 0.000 claims description 30
- 239000002344 surface layer Substances 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 28
- 230000008439 repair process Effects 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 9
- 239000004746 geotextile Substances 0.000 claims description 9
- 239000004570 mortar (masonry) Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000007569 slipcasting Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 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
- 239000004575 stone Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003466 welding 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
- E01C11/00—Details of pavings
- E01C11/005—Methods or materials for repairing pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
- E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
- E01C11/14—Dowel assembly ; Design or construction of reinforcements in the area of joints
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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
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
- E01C23/09—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges
- E01C23/0966—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for filling or priming, with or without working the surface of the filling or applying particulate material thereto, e.g. for filling the joints of stone-sett paving
- E01C23/0973—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for forming cuts, grooves, or recesses, e.g. for making joints or channels for markings, for cutting-out sections to be removed; for cleaning, treating, or filling cuts, grooves, recesses, or fissures; for trimming paving edges for filling or priming, with or without working the surface of the filling or applying particulate material thereto, e.g. for filling the joints of stone-sett paving with liquid or semi-liquid materials, e.g. crack sealants
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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
- E01C7/147—Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering
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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
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a structural combination design optimization method for repairing a cement pavement, which relates to the technical field of maintenance of pavement damage of highway engineering concrete pavement.
Description
Technical Field
The invention relates to the technical field of damage maintenance of highway engineering concrete pavements, in particular to a structural combination design optimization method for repairing cement pavements.
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, under the conditions of repeated action of heavy load traffic and buckling stress or shrinkage stress caused by temperature or humidity gradient, stress concentration is generated, 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 is 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 large. 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 joint or crack, under the impact action of the vehicle load, the broken layer can be scoured and run off, 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 shorter, and the repair effect is poor.
Disclosure of Invention
The invention aims to solve the problem that a cement concrete pavement repair structure in the prior art is easy to produce secondary damage.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a structural combination design optimization method for repairing a cement pavement, which is characterized by comprising the following steps of:
the utility model provides a pavement repair structure combination, includes that protruding formula pit, basic unit, multilayer geotechnique's cloth layer and waterproof film layer combine compound isolation layer, mortar leveling layer, strengthening rib, dowel steel, slip casting layer, pre-buried pressure box and concrete surface layer of constituteing, wherein:
a. the convex pit groove is formed by chiseling a damaged concrete pavement and chiseling a base layer on a part to be repaired, the area of the chiseled base layer on the part to be repaired is larger than that of the chiseled base layer on the damaged surface layer, and the boundary of the chiseled base layer on the part to be repaired exceeds an upper cutting line and forms a cavity with the bottom of the original surface layer;
b. after the rough surface appears on the top surface of the base layer after the partial chiseling, leveling the rough top surface of the base layer by using mortar and forming a leveling layer;
c. the composite isolation layer formed by combining the plurality of geotechnical cloth layers and the waterproof film layers is positioned on the leveling layer in the convex pit;
d. the dowel bar adopts a U-shaped dowel bar and is matched with the reinforcing ribs, when the U-shaped dowel bar-reinforcing rib composite structure is installed, the functional end of the dowel bar-reinforcing rib is inserted into a drill hole, the functional end of the reinforcing rib is inserted into a cavity along with the functional end of the dowel bar-reinforcing rib, the dowel bar-reinforcing rib composite structure is longitudinally arranged in the running direction, the corners at two sides of the repairing structure are properly encrypted and arranged, and the repairing structure is welded through transverse reinforcing ribs to form an integral structure;
e. the grouting layer is composed of an elastic grouting bag, the size of the grouting bag is consistent with that of the cavity, two connecting holes A and two connecting holes B are formed in one side, close to the reinforcing ribs, of the grouting bag, small-sized net-shaped pipelines are arranged on the outer surface of the elastic grouting bag, small-sized net-shaped pipelines are provided with small uniformly distributed holes, and the net-shaped pipelines are of a cross structure and uniformly distributed on the surface of the elastic grouting bag.
The optimized repairing construction method comprises the following steps:
step 1, determining a construction boundary, and cutting and breaking a damaged old cement concrete pavement;
step 2, tamping and leveling the top surface of the roadbed;
step 3, pre-burying a pressure box;
step 4, paving an isolation layer;
step 5, installing reinforcing ribs and dowel bars;
step 6, paving a grouting layer;
and 7, pouring a repair material.
The invention is further arranged to: in the step of cutting and breaking the damaged old cement concrete pavement, the construction boundary is determined, and a cavity formed by the boundary of the base layer and the bottom of the original surface layer is chiseled off by the part to be repaired, wherein the length of the cavity is more than 0.5m and less than 1m, and the height of the cavity is more than 5cm and less than 20cm in the running direction;
the invention is further arranged to: in the pressure box embedding step, an embedded pressure box is arranged at the center of a repairing area, the top surface of a base layer, an embedded pressure box is respectively arranged at the positions of two sides of corners of the repairing area, and the pressure boxes are positioned below a composite isolation layer and on the top surface of the base layer; correspondingly, pre-buried pressure boxes are respectively arranged at the center area of the top surface of the cavity and two corners of one side close to the repair joint in the cavity area;
the invention is further arranged to: in the isolation layer laying step, a plurality of geotechnical cloth layers are specifically two layers, a first geotechnical cloth layer is positioned on a leveling layer, a waterproof film layer is positioned on the first geotechnical cloth layer, a second geotechnical cloth layer is positioned on the waterproof film layer, the two geotechnical cloth layers and one layer of waterproof film form a composite isolation layer sandwich structure, the boundary of the composite isolation layer is bonded, the composite isolation layer formed by combining the plurality of geotechnical cloth layers and the waterproof film layer is positioned on the leveling layer in a convex pit groove, the laying area is equal to the area of a chiseled roadbed, and one end of the composite isolation layer penetrates into a cavity formed by an original concrete pavement and the chiseled roadbed and clings to one side of the foundation layer;
the invention is further arranged to: in the step of installing the reinforcing rib and the dowel steel, after the composite isolation layer is paved in the cavity, a hole is drilled on one side of the cutting surface of the original concrete pavement, a U-shaped dowel steel-reinforcing rib composite structure is installed, the dowel steel functional end of the dowel steel-reinforcing rib is inserted into the drilled hole, the dowel steel functional end is inserted into the cavity along with the dowel steel-reinforcing rib functional end, the dowel steel-reinforcing rib composite structure is longitudinally arranged in the running direction, corners on two sides of the repairing structure are properly encrypted and arranged, and the transverse reinforcing rib is welded to form an integral structure;
the invention is further arranged to: in the grouting layer laying step, specifically, one end of a grouting outlet of an L-shaped grouting pipe is connected with an elastic grouting bag, the elastic grouting bag is respectively connected with an interface A and an interface B, the elastic grouting bag is placed in a cavity area and is positioned on a composite isolation layer and a reinforcing rib, and the other end of the grouting outlet faces upwards and is higher than the original pavement elevation;
the invention is further arranged to: in the grouting layer laying step, the isolation layer in the repairing area is leveled, the scum on the surface of the joint is cleaned, before concrete pouring is carried out, the elastic grouting bags are pre-inflated through the interfaces A, the number of the elastic grouting interfaces A is two, the valve switch of one grouting port A is closed, the other grouting port A is inflated, the bags support the hollow area, the valve of the connecting ports is closed, the connecting ports B which are connected with the reticular pipelines are reserved at the two ends of the grouting bags in the same way, grouting materials are injected into the grouting bags by the connecting ports A, and the grouting materials are injected into the reticular grouting pipes by the connecting ports B and released through small holes which are uniformly distributed.
The invention is further arranged to: in the repair material pouring step, a repair material is poured in the residual construction range, the repair material is made of a micro-expansion high-crack-resistance cement-based rapid repair material, after the repair material is hardened, preliminary grouting is carried out on a cavity area according to the pressure of a pressure box in a measured central area and a pressure box in a corner area, the preliminary grouting is to grouting into an elastic grouting bag, one of two grouting interfaces A with all the interface valves closed is opened, the other grouting interface A is kept closed, pressurized grouting is carried out through the opening of the valve grouting opening A, the grouting pressure is greater than the pressure of an embedded pressure box in the measured repair area by not more than 10%, the grouting is nearly completed, the grouting pressure is kept, the pressure measured by the pressure box in the cavity area is observed, if the measured pressure is stable and has no obvious change, the grouting is continued for 2 minutes, and the grouting opening valve is closed to avoid pressure drop;
the invention is further arranged to: in the repair material pouring step, after the primary grouting material is hardened, continuously observing the pressure of the pressure box in the cavity area, if the pressure box pressure is reduced and the reduced area is stable and has no obvious change, performing secondary grouting through a grouting opening B, performing grouting monitoring in the same process as primary grouting, keeping the grouting pressure close to completion, keeping the grouting pressure, observing the pressure measured by the pressure box in the cavity area, if the measured pressure is stable and has no obvious change, continuously keeping the pressure for 2 minutes, and closing a grouting opening valve.
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
according to the invention, the convex pit slot repairing structure is arranged, so that the stress characteristics of the joint area of the new and old plates of the cement pavement are effectively improved under the action of heavy load and environmental coupling on the basis of improving the interlayer contact state of the area outside the joint of the new and old concrete plates, and compared with the conventional concrete pavement pit slot repairing structure, the reinforcing rib of the plate bottom and the composite isolating layer effectively disperse stress, the bending tensile stress of the plate bottom is reduced and the stress concentration phenomenon is effectively improved by prolonging the paving length of the composite isolating layer when the concentrated load of a vehicle acts on the joint;
according to the invention, the double-layer geotextile is arranged to wrap the waterproof film layer, when cracks are generated in the surface layer or the joint, the waterproof film layer in the composite isolation layer prevents water from flowing into the base layer, so that pumping and mud pumping phenomena of the pavement slab are prevented under the action of running load, the occurrence of dislocation and plate void at the joint is prevented, the service life of the cement concrete pavement repair structure is prolonged, the defect of poor puncture resistance of a waterproof layer to broken stones or sharp objects is effectively solved, and the integrity of a geomembrane below a pavement is ensured;
according to the invention, a composite isolation 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 whole stress uniformly distributes external load to the base layer, so that the problem that the cement concrete pavement repair structure in the prior art is easy to generate secondary damage is solved.
Drawings
FIG. 1 is an optimized construction flow chart of a structural combination design optimization method for repairing a cement pavement;
FIG. 2 is a diagram showing the structure of a convex pit and groove of the structural combination design optimization method for repairing cement pavement;
FIG. 3 is a diagram showing the structure of the bottom side cavity of the convex pit in the method for optimizing the structural combination design for repairing the cement pavement;
FIG. 4 is a schematic diagram of the position structure of geotextile, waterproof film, grouting pipe, U-shaped reinforcing rib and dowel bar in the structural combination design optimization method for repairing cement pavement;
FIG. 5 is a schematic view of a structure for installing and connecting a reinforcing rib and a dowel bar by using the structural combination design optimization method for repairing a cement pavement;
FIG. 6 is a schematic view of the structure of an elastic grouting bag of the structural combination design optimization method for repairing cement pavement;
FIG. 7 is a diagram showing the installation position of a pressure box in the method for optimizing the structural assembly design for repairing a cement pavement according to the present invention;
FIG. 8 is a schematic diagram of the external net-shaped pipeline of the elastic grouting bag for the structural combination design optimization method for repairing the cement pavement.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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.
Referring to fig. 1-8, the present invention provides a technical solution: the structural combination design optimization method for repairing the cement pavement is characterized by comprising the following steps of:
the utility model provides a pavement repair structure combination, includes that protruding formula pit, basic unit, multilayer geotechnique's cloth layer and waterproof film layer combine compound isolation layer, mortar leveling layer, strengthening rib, dowel steel, slip casting layer, pre-buried pressure box and concrete surface layer of constituteing, wherein:
a. the convex pit consists of chiseling a damaged concrete pavement and chiseling a base layer on a part to be repaired, wherein the area of the chiseling base layer on the part to be repaired is larger than that of the chiseling base layer on the damaged surface layer, and the boundary of the chiseling base layer on the part to be repaired exceeds an upper cutting line and forms a cavity with the bottom of the original surface layer, as shown in figure 2;
b. after the rough surface appears on the top surface of the base layer after the partial chiseling, leveling the rough top surface of the base layer by using mortar and forming a leveling layer;
c. the composite isolation layer formed by combining the plurality of geotechnical cloth layers and the waterproof film layers is positioned on the leveling layer in the convex pit;
d. the dowel bar adopts a U-shaped dowel bar and is matched with the reinforcing rib, when the U-shaped dowel bar-reinforcing rib composite structure is installed, the functional end of the dowel bar-reinforcing rib is inserted into a drill hole, the functional end of the reinforcing rib is inserted into a cavity along with the functional end of the dowel bar, the dowel bar-reinforcing rib composite structure is longitudinally arranged in the running direction, corners on two sides of the repairing structure are properly arranged in an encrypted mode, and the corners are welded through transverse reinforcing ribs to form an integral structure, as shown in fig. 5, wherein an end A is poured into and newly repaired with concrete, an end B is implanted into original pavement concrete through the drill hole, and an end C is inserted into the cavity and is positioned on a composite isolation layer;
e. the grouting layer is composed of an elastic grouting bag, the size of the grouting bag is consistent with that of the cavity, two connecting holes A and two connecting holes B are formed in one side, close to the reinforcing ribs, of the grouting bag, small-sized net-shaped pipelines are arranged on the outer surface of the elastic grouting bag, small-sized net-shaped pipelines are provided with small uniformly distributed holes, and the net-shaped pipelines are of a cross structure and uniformly distributed on the surface of the elastic grouting bag, as shown in fig. 6.
The optimized repairing construction method comprises the following steps:
s1, firstly, cutting and breaking a damaged old cement concrete pavement, determining a construction boundary during repair, excavating the damaged pavement to the depth which is the thickness of an original concrete pavement slab and is equal to the thickness of a roadbed top surface, and further, excavating part of the roadbed to the depth which is more than 5cm and less than 20cm, as shown in figure 3;
s2, re-tamping the top surface of the excavated roadbed by adopting a small-sized tamping machine, wherein tamping is performed by taking the compactness of the original concrete pavement roadbed as a standard, and the compacted roadbed part and the cavity part are subjected to leveling on the top surface of the excavated roadbed by adopting mortar, as shown in fig. 4;
s3, finishing leveling, arranging pre-buried pressure boxes at different positions respectively, arranging a pre-buried pressure box at the center of a repairing area and the top surface of a base layer, arranging a pre-buried pressure box at the positions of two sides of corners of the repairing area respectively, and arranging the pressure boxes below a composite isolation layer and on the top surface of the base layer; correspondingly, in the cavity area, two corners at the center area of the top surface of the cavity and at one side close to the repair joint are respectively provided with embedded pressure boxes, as shown in fig. 7;
s4, paving a composite isolation layer, wherein the composite isolation layer formed by combining a plurality of geotechnical cloth layers and waterproof film layers is positioned on the leveling layer in the convex pit slot, the paving area is equal to the area of the chiseled roadbed, and one end of the composite isolation layer penetrates into a cavity formed by the original concrete pavement and the chiseled roadbed and is clung to one side of the roadbed;
s5, drilling holes on one side of the cutting surface of the original concrete pavement after the composite isolation layer is paved on the top surface of the roadbed leveling layer and the cavity, installing a U-shaped dowel bar-reinforcing rib composite structure, inserting dowel bar functional ends of dowel bars-reinforcing ribs into the drilled holes, inserting reinforcing rib functional ends into the cavity along with the dowel bar functional ends, longitudinally arranging the dowel bar-reinforcing rib composite structure in the running direction, and properly encrypting and arranging corners on two sides of the repairing structure, so that the repairing structure forms an integral structure through transverse reinforcing rib welding;
s6, installing the dowel bar-reinforcing rib composite structure, connecting one end of a grouting outlet of the L-shaped grouting pipe with an elastic grouting bag, respectively connecting the interface A and the interface B, placing the elastic grouting bag into a cavity area, and placing the elastic grouting bag on a composite isolation layer and the reinforcing rib, wherein the other end of the grouting outlet faces upwards and is higher than the original pavement elevation;
s7, leveling the isolation layer in the repair area, cleaning scum on the surface of the joint, keeping clean and tidy, pre-inflating the elastic grouting bags through the interfaces A before concrete pouring, closing the valve switch of one grouting port A and inflating the other grouting port A by the interfaces A, supporting the bags to fill the cavity area, and closing the valve of the connecting port;
s8, after the concrete slab is finished, pouring prefabricated panels with the same size and the same mixing ratio on an empty site according to the mixing ratio of the repairing materials, the length, the width and the thickness of the original concrete slab, wherein the prefabricated panels are used for determining grouting pressure, only one prefabricated panel is required to be prepared, the prefabricated panels which are 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 are collected after the prefabricated panels are installed and leveled, the pressure of the pre-buried pressure boxes at the corner positions are collected, and the prefabricated slabs are hoisted out after the pressure collection is finished. The step is only needed to be carried out once, the obtained grouting pressure is used in different pile numbers of different subsequent segments, and the pre-buried pressure boxes in the repairing area do not need to be laid continuously;
s9, 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 preliminary grouting in a cavity area according to the pressure of the pressure box in the central area and the pressure box in the corner area, performing preliminary grouting, namely grouting into an elastic grouting bag, opening one of two grouting interfaces A with all the interface valves closed, and keeping the other one closed, performing pressurized grouting by opening the valve grouting opening A, wherein the grouting pressure is larger than the pressure of the pre-buried pressure box in the repairing area by not more than 10%. When grouting is nearly completed, maintaining grouting pressure, observing the pressure measured by a pressure box in a cavity area, 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;
s10, according to the characteristics of grouting materials, after the primary grouting materials harden, continuously observing the pressure of a pressure box in a cavity area, if the pressure box pressure is reduced and the reduced area is stable and has no obvious change, performing secondary grouting through a grouting opening B, enabling a grouting monitoring process to be consistent with the primary grouting, keeping the grouting pressure close to completion, keeping the grouting pressure, observing the pressure measured by the pressure box in the cavity area, if the measured pressure is stable and has no obvious change, continuously keeping the pressure for 2 minutes, and closing a grouting opening valve.
In summary, the structural combination design optimization method for repairing the cement pavement provided by the invention has the advantages that the stress characteristics of the joint area of the new plate and the old plate of the cement pavement are effectively improved by arranging the convex pit repairing structure, the load transmission capability mechanism between the new plate and the old plate of the cement pavement is effectively improved, compared with the conventional concrete pit repairing, when the vehicle concentrated load acts on the joint, the new and the old plates act cooperatively, the reinforcing ribs at the bottom of the plate and the composite isolating layer effectively disperse the stress, the bending and stretching stress at the bottom of the plate is reduced, the stress concentration phenomenon is effectively improved, and in addition, the double-layer geotextile is used for wrapping the waterproof film layer, the defect of poor anti-broken stone or sharp object puncture capability of the waterproof layer is effectively solved, and the integrity of the geofilm 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 prevents water from flowing into the base layer, so that pumping and mud pumping phenomena of the pavement slab are prevented under the action of driving load, the occurrence of dislocation and slab void at the joint is prevented, the service life of the cement concrete pavement repairing structure is prolonged, the composite isolation layer is arranged between the surface layer and the base layer, 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 slab bears load, the whole stress uniformly distributes external load onto the base layer.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. The structural combination design optimization method for repairing the cement pavement is characterized by comprising the following steps of:
the utility model provides a pavement repair structure combination, includes that protruding formula pit, basic unit, multilayer geotechnique's cloth layer and waterproof film layer combine compound isolation layer, mortar leveling layer, strengthening rib, dowel steel, slip casting layer, pre-buried pressure box and concrete surface layer of constituteing, wherein:
a. the convex pit groove is formed by chiseling a damaged concrete pavement and chiseling a base layer on a part to be repaired, the area of the chiseled base layer on the part to be repaired is larger than that of the chiseled base layer on the damaged surface layer, and the boundary of the chiseled base layer on the part to be repaired exceeds an upper cutting line and forms a cavity with the bottom of the original surface layer;
b. after the rough surface appears on the top surface of the base layer after the partial chiseling, leveling the rough top surface of the base layer by using mortar and forming a leveling layer;
c. the composite isolation layer formed by combining the plurality of geotechnical cloth layers and the waterproof film layers is positioned on the leveling layer in the convex pit;
d. the dowel bar adopts a U-shaped dowel bar and is matched with the reinforcing ribs, when the U-shaped dowel bar-reinforcing rib composite structure is installed, the functional end of the dowel bar-reinforcing rib is inserted into a drill hole, the functional end of the reinforcing rib is inserted into a cavity along with the functional end of the dowel bar-reinforcing rib, the dowel bar-reinforcing rib composite structure is longitudinally arranged in the running direction, the corners at two sides of the repairing structure are properly encrypted and arranged, and the repairing structure is welded through transverse reinforcing ribs to form an integral structure;
e. the grouting layer is composed of an elastic grouting bag, the size of the grouting bag is consistent with that of the cavity, two connecting holes A and two connecting holes B are formed in one side, close to the reinforcing ribs, of the grouting bag, small-sized net-shaped pipelines are arranged on the outer surface of the elastic grouting bag, small-sized net-shaped pipelines are provided with small uniformly distributed holes, and the net-shaped pipelines are of a cross structure and uniformly distributed on the surface of the elastic grouting bag.
The optimized repairing construction method comprises the following steps:
step 1, determining a construction boundary, and cutting and breaking a damaged old cement concrete pavement;
step 2, tamping and leveling the top surface of the roadbed;
step 3, pre-burying a pressure box;
step 4, paving an isolation layer;
step 5, installing reinforcing ribs and dowel bars;
step 6, paving a grouting layer;
and 7, pouring a repair material.
2. The method for optimizing structural combination design for repairing a cement pavement according to claim 1, wherein in the step of determining the construction boundary and cutting and breaking the damaged old cement concrete pavement, the part to be repaired chisels a cavity formed by the boundary of the base layer and the bottom of the original surface layer, the length of the cavity in the running direction is more than 0.5m and less than 1m, and the height of the cavity in the running direction is more than 5cm and less than 20cm.
3. The method for optimizing structural combination design for repairing cement pavement according to claim 1, wherein in the step of embedding the pressure boxes, an embedded pressure box is arranged at the center of a repairing area and at the top surface of a base layer, embedded pressure boxes are respectively arranged at the positions of two sides of corners of the repairing area and at the top surface of the base layer, and the pressure boxes are positioned below a composite isolation layer and on the top surface of the base layer; correspondingly, in the cavity area, two corners at the center area of the top surface of the cavity and at one side close to the repair joint are respectively provided with a pre-buried pressure box.
4. The method for optimizing the structural combination design for repairing the cement pavement according to claim 1, wherein in the step of laying the isolation layer, the plurality of geotextiles are two layers, the first geotextile layer is positioned on the leveling layer, the waterproof film layer is positioned on the first geotextile layer, the second geotextile layer is positioned on the waterproof film layer, the two geotextiles and the waterproof film layer form a composite isolation layer sandwich structure, the boundary of the composite isolation layer is bonded, the composite isolation layer formed by combining the plurality of geotextiles and the waterproof film layer is positioned on the leveling layer in the convex pit groove, the laying area is equal to the area of the chiseled roadbed, and one end of the composite isolation layer is deep into a cavity formed by the original concrete pavement and the chiseled roadbed and clings to one side of the foundation layer.
5. The method for optimizing the structural combination design for repairing the cement pavement according to claim 1, wherein in the step of installing the reinforcing rib and the dowel steel, after the composite isolation layer is paved in the cavity, a hole is drilled on one side of the cutting surface of the original concrete pavement, the U-shaped dowel steel and the reinforcing rib composite structure is installed, the dowel steel functional end of the dowel steel and the dowel steel is inserted into the drilled hole, the reinforcing rib functional end is inserted into the cavity along with the dowel steel functional end, the dowel steel and the reinforcing rib composite structure are longitudinally arranged in the running direction, corners on two sides of the repairing structure are properly encrypted and arranged, and the transverse reinforcing ribs are welded to form the integral structure.
6. The method for optimizing the structural combination design for repairing a cement pavement according to claim 1, wherein in the step of laying the grouting layer, specifically, one end of a grouting opening of an L-shaped grouting pipe is connected with an elastic grouting bag, the elastic grouting bag is respectively connected with an interface A and an interface B, the elastic grouting bag is placed in a cavity area and is positioned on a composite isolation layer and a reinforcing rib, and the other end of the grouting opening faces upwards and is higher than the original pavement elevation.
7. The method according to claim 6, wherein in the step of laying the grouting layer, the isolation layer of the repair area is leveled and the scum on the surface of the joint is cleaned, before the concrete is poured, the elastic grouting bags are pre-inflated through the connectors A, two of the elastic grouting connectors A are used for closing the valve switch of one grouting opening A, the other grouting opening A is inflated, the bags are used for supporting the hollow area, the valve of the connectors is closed, the same connectors B for reserving connecting net pipelines are reserved at two ends of the grouting bags, the connectors A are used for grouting materials into the grouting bags for filling, and the connectors B are used for grouting the grouting materials into the net grouting pipes and releasing the grouting materials through evenly distributed small holes.
8. The method for optimizing the structural combination design for repairing the cement pavement according to claim 1, wherein in the step of pouring the repairing material, the repairing material is poured in the residual construction range, the repairing material is a micro-expansion high-crack-resistance cement-based rapid repairing material, after the repairing material is hardened, the cavity area preliminary grouting is performed according to the measured pressure of the pressure box in the central area and the corner area, the preliminary grouting is performed to grouting the inside of an elastic grouting bag, one of two grouting interfaces A with all the interface valves closed is opened, the other one is kept closed, the pressurizing grouting is performed by opening the valve grouting opening A, the grouting pressure is larger than the measured pressure of the pre-buried pressure box in the repairing area and is not more than 10%, the grouting is nearly completed, the grouting pressure is kept to be kept under the pressure, the measured pressure of the pressure box in the cavity area is observed, if the measured pressure is stable and has no obvious change, the grouting opening valves are continuously kept under the pressure for 2 minutes, and the grouting opening valves are closed to avoid the pressure drop.
9. The method for optimizing structural combination design for repairing a cement pavement according to claim 8, wherein in the step of pouring the repairing material, after the primary grouting material is hardened, continuously observing the pressure of the pressure box in the cavity area, if the pressure box is reduced and the reduced area is stable and has no obvious change, performing secondary grouting through the grouting opening B, wherein the grouting monitoring process is consistent with the primary grouting, when grouting is nearly completed, maintaining the grouting pressure, observing the pressure measured by the pressure box in the cavity area, and if the measured pressure is stable and has no obvious change, continuously maintaining the grouting pressure for 2 minutes, and closing the grouting opening valve.
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| CN117266023A (en) * | 2023-11-21 | 2023-12-22 | 北京城建信捷轨道交通工程咨询有限公司 | Paving structure and paving method of rail steel bridge deck |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117266023A (en) * | 2023-11-21 | 2023-12-22 | 北京城建信捷轨道交通工程咨询有限公司 | Paving structure and paving method of rail steel bridge deck |
| CN117266023B (en) * | 2023-11-21 | 2024-02-06 | 北京城建信捷轨道交通工程咨询有限公司 | Paving structure and paving method of rail steel bridge deck |
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