Asphalt pavement coring hole repairing structure and repairing method

Abstract

The invention provides an asphalt pavement coring hole repairing structure, which comprises an asphalt pavement body, the asphalt pavement body comprises a pavement surface layer, and the pavement surface layer is provided with a surface layer coring hole; the repairing body is fixedly arranged in the surface layer coring hole through an auxiliary repairing mechanism, the repairing body comprises a repairing body, the repairing body comprises a core filling precast block and an expansion filling body, the core filling precast block is arranged in the center of the surface layer coring hole, and the expansion filling body is arranged on the periphery of the core filling precast block. The invention further provides an asphalt pavement coring hole repairing method. By means of the expansion characteristic of the expansion filling body, the compaction effect of the core filling prefabricated block and the side wall of the coring hole is enhanced; and meanwhile, by means of the characteristics of low-temperature shrinkage and high-temperature softening of the asphalt pavement material, the filling compaction degree in the coring hole and the interface bonding firmness strength of the coring hole are further improved.

Description

Technical Field

[0001] This application relates to the field of asphalt pavement testing technology, specifically to an asphalt pavement core hole repair structure and repair method. Background Technology

[0002] Core sampling of asphalt pavement is an important way to assess pavement quality. However, if the holes left after core sampling are not repaired in a timely and effective manner, they will cause a series of pavement defects.

[0003] Currently, the repair of core holes is mostly carried out by cold patching or hot asphalt injection. These methods are simple to operate and low in cost, but they have many inherent drawbacks, such as weak bonding at the core hole interface, poor compaction of the hole filling, and poor road surface smoothness.

[0004] To address the aforementioned inherent drawbacks, an existing technology offers a prefabricated filling method for coring holes in asphalt pavements based on deformation. This method involves preparing novel top, middle, and bottom layer specimens based on the hole depth, and stacking them concentrically from top to bottom to obtain a composite specimen matching the hole depth. A tool is then used to press down on the composite specimen until the downward displacement equals the deformation of the asphalt mixture layer. This method fully considers the thickness of the pavement structural layers and the coordination between the structural deformation after coring and the deformation of the outer structural layers of the hole during prefabrication. However, the prefabrication process in this method is complex, making it difficult to solve the bonding problem at the interface between the prefabricated component and the hole, and it is also difficult to ensure the smoothness of the pavement structure after hole filling. Summary of the Invention

[0005] The purpose of this invention is to provide a structure and method for repairing core holes in asphalt pavements, so as to solve one or more of the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution.

[0007] In a first aspect, the present invention provides a structure for repairing core holes in asphalt pavement, comprising: An asphalt pavement body, the asphalt pavement body including a pavement surface layer, the pavement surface layer being provided with surface layer core sampling holes; The repair body is fixed in the core retrieval hole of the surface layer by an auxiliary repair mechanism. The repair body includes a repair body, which includes a core filling prefabricated block and an expanded filler. The core filling prefabricated block is located at the center of the core retrieval hole of the surface layer, and the expanded filler is located on the outer periphery of the core filling prefabricated block.

[0008] As an improvement of the present invention, the repair body further includes a rod-side connector and transverse connecting ribs. The rod-side connector is provided in the core filling precast block. A plurality of transverse connecting ribs are evenly distributed around the rod-side connector, and the transverse connecting ribs extend into the expansion filling body.

[0009] As an improvement of the present invention, the outer periphery of the core-filling precast block is evenly distributed with a plurality of sidewall connecting grooves, the sidewall connecting grooves are provided with the expansion filler, and the transverse connecting ribs penetrate the expansion filler in the sidewall connecting grooves.

[0010] As an improvement of the present invention, the asphalt pavement body further includes a pavement base course and a subgrade soil, the pavement base course being stacked on the upper surface of the subgrade soil, the repair body further includes a repair base, the repair base includes a pre-installed anchor pipe, the pre-installed anchor pipe being inserted into the pavement base course and the subgrade soil, the repair body further includes a stiffening connecting rod, one end of the stiffening connecting rod passing through the rod-side connector and the other end passing through the pre-installed anchor pipe.

[0011] As an improvement of the present invention, the repair substrate further includes a pipe bottom grout and a grout-stabilized soil. The pipe bottom grout is located at the bottom of the pre-installed anchor pipe and at the bottom end of the rigid connecting rod, and the grout-stabilized soil is located at the bottom of the outer periphery of the pre-installed anchor pipe.

[0012] As an improvement of the present invention, the repair body further includes a grout bonding body, and the bottom of the core filling precast block is provided with a plurality of annular grout connecting grooves, the grout bonding body is provided in the grout connecting grooves, and the grout bonding body is provided on the upper surface of the road base layer.

[0013] As an improvement of the present invention, the upper surface of the core filling prefabricated block and the expansion filler is designed as an upwardly convex arch shape.

[0014] As an improvement of the present invention, an elastic side rib is provided at the end of the transverse connecting rib away from the rod-side connecting body, and the elastic side rib abuts against the inner wall of the core hole of the surface layer.

[0015] Secondly, the present invention provides a method for repairing core holes in asphalt pavement, comprising the following steps: A precast core-filled precast block; the core-filled precast block is provided with a rod-side connector, a transverse connecting rib and a stiffening connecting rod. The rod-side connector is provided with a plurality of transverse connecting ribs evenly distributed around its circumference. The transverse connecting ribs extend to the outside of the core-filled precast block. The outer end of the transverse connecting rib is provided with an elastic side rib. One end of the stiffening connecting rod passes through the rod-side connector and the other end extends to the outside of the core-filled precast block. The pre-installed anchor pipes are inserted into the post-installed anchor holes in the road base and subgrade soil, and grout is injected into the bottom of the pre-installed anchor pipes; the bottom of the pre-installed anchor pipes is provided with multiple rows of grouting holes in the circumferential direction; A grout adhesive is laid at the bottom of the core hole of the road surface layer; a metal adhesive is applied to the bottom of the stiffening connecting rod. The core-filling precast block is placed in the core-taking hole of the surface layer and the bottom of the stiffening connecting rod is inserted into the pre-installed anchor pipe. An auxiliary repair mechanism is placed on the upper surface of the pavement surface layer and spans across the top of the core-filling precast block; the auxiliary repair mechanism includes an arched pressure plate on the upper surface of the core-filling precast block, a low-temperature pressure box on the upper surface of the pavement surface layer and around the core-taking hole of the surface layer, multiple temperature compensation bands on the upper surface of the arched pressure plate, and a compaction mechanism located directly above the arched pressure plate; the arched pressure plate is provided with a filling injection pipe; The road surface layer around the core sampling hole is cooled to a first temperature by the low-temperature pressure chamber; an expansion filler is injected into the outer periphery of the core precast block through the filling injection pipe; and the core precast block is heated to a second temperature by the temperature compensation belt. The compaction mechanism applies pressure to the arched pressure plate to make the precast core block, the expansion filler and the grouting adhesive tightly connected, and the rigid connecting rod causes the grouting material at the bottom of the pipe to be squeezed into the subgrade soil from the grouting hole to form grout-stabilized soil.

[0016] As an improvement of the present invention, the auxiliary repair mechanism further includes an annular support plate laid on the upper surface of the road surface layer, the annular support plate being provided with the low-temperature ballast box, the low-temperature ballast box containing water-ice mixed salt; the compaction mechanism includes two guide columns symmetrically arranged on the inner side of the annular support plate, a counter-pressure screw on the guide columns, a support beam connected to the counter-pressure screw at both ends, and an arched pressure beam connected to the support beam through multiple connecting uprights, the arched pressure beam being provided on the upper surface of the arched pressure plate, the arched pressure plate being slidably connected to the guide columns, and multiple temperature compensation strips being provided on the upper surface of the arched pressure beam.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses a combination of core-filling precast blocks and expansion fillers to seal and repair the core holes of asphalt pavement. The expansion characteristics of the expansion filler can be used to enhance the compaction effect between the core-filling precast blocks and the sidewalls of the core holes. At the same time, the low-temperature ballast box can reduce the temperature of the pavement surface layer, and the temperature compensation belt can increase the temperature of the core-filling precast blocks. The low-temperature shrinkage and high-temperature softening characteristics of asphalt pavement materials can be used to further improve the compaction degree of the core hole and the bonding strength of the core hole interface.

[0018] (2) The present invention connects the stiff connecting rod at the bottom of the core-filling precast block to the precast anchor pipe, and sets the bottom grouting body at the bottom of the precast anchor pipe. At the same time, the side wall connecting groove and transverse connecting bar are set on the core-filling precast block, which can enhance the axial and radial connection stability of the core-filling precast block.

[0019] (3) The present invention uses a linkage compaction mechanism, which can apply a stable downward pressure load to the core-filled precast block to reduce the difficulty of compacting the core-filled precast block.

[0020] (4) The present invention sets the upper surface of the core-filling precast block as an upward convex arch shape, which can be used to apply a downward pressure load to the core-filling precast block with the help of the upper traffic load to improve the smoothness of the road surface and avoid the problem of road surface depression after the core hole of the asphalt pavement is repaired. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below; obviously, the drawings described below are some embodiments of this invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort. Figure 1 This is a schematic diagram of an asphalt pavement core hole repair structure according to the present invention; Figure 2 This is a cross-sectional view of the auxiliary repair mechanism in the asphalt pavement core hole repair structure of the present invention; Figure 3 This is a partial cross-sectional view of the repair body in an asphalt pavement core hole repair structure according to the present invention; In the diagram: 10-Asphalt pavement body, 11-Pavement base course, 111-Post-installed anchor hole, 12-Subgrade soil, 13-Pavement surface course, 131-Surface course core sampling hole; 20-Repair body, 21-Repair substrate, 211-Pre-installed anchor pipe, 2111-Grouting hole, 212-Grouting body at the bottom of the pipe, 213-Grouting-solidified soil, 22-Repair body, 221-Core filling precast block, 2211-Grouting connection groove, 2212-Side wall connection groove, 222-Rod side connector, 223-Strength connecting rod, 224-Transverse reinforcement, 225-Elastic side reinforcement, 226-Grouting adhesive, 227-Expanding filler; 30-Auxiliary repair mechanism, 31-Compacting mechanism, 311-Arch-shaped pressure plate, 312-Arch-shaped pressure beam, 313-Connecting upright, 314-Supporting crossbeam, 315-Reverse pressure screw, 316-Pressing nut, 317-Guide column, 3171-Sliding channel, 318-Sliding channel connecting plate, 32-Low temperature pressure box, 321-Water-ice mixed salt, 33-Annular support plate, 34-Temperature compensation belt, 35-Filling injection pipe. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention; obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Based on the technical solutions disclosed in the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0024] Please see Figures 1 to 3 This invention provides an asphalt pavement core hole repair structure, comprising an asphalt pavement body 10 and a repair body 20. The asphalt pavement body 10 includes a pavement surface layer 13, on which a surface layer core hole 131 for testing is excavated. The repair body 20 is fixed within the surface layer core hole 131 by an auxiliary repair mechanism 30. The repair body 20 includes a repair body 22, which includes a pre-filled core block 221 and an expanded filler 227. The pre-filled core block 221 is located at the center of the surface layer core hole 131, and the expanded filler 227 is located between the outer periphery of the pre-filled core block 221 and the inner wall of the surface layer core hole 131, and is tightly connected to both the outer periphery of the pre-filled core block 221 and the inner wall of the surface layer core hole 131.

[0025] More specifically, the surface layer core sampling hole 131 is a cylindrical hole with an inner diameter of 90mm~130mm; the core filling precast block 221 is precast using SMA-20 medium-grained asphalt concrete, and its shape is basically cylindrical with an upwardly convex arch on the upper surface, the arch height being 0.4cm~1.0cm; the bottom of the core filling precast block 221 is provided with multiple annular grouting grooves 2211 at equal intervals, the cross-section of the grouting grooves 2211 is rectangular, and the grouting grooves... The groove 2211 is filled with a grouting binder 226; the outer peripheral wall of the core-filling precast block 221 is evenly distributed with multiple side wall connecting grooves 2212, and the cross section of the side wall connecting grooves 2212 is trapezoidal; the expansion filler 227 is filled between the outer periphery of the core-filling precast block 221 and the inner wall of the surface core hole 131 and is filled in the side wall connecting grooves 2212. At the same time, the upper surface of the expansion filler 227 is also an upward convex arch shape, which smoothly transitions with the upper surface of the core-filling precast block 221.

[0026] In some embodiments, the repair body 22 further includes a rod-side connector 222, transverse reinforcing bars 224, and a stiffening rod 223. Specifically, the center of the core-filling precast block 221 is provided with a rod-side connector 222, which is made of rolled steel plate; a plurality of horizontally arranged transverse reinforcing bars 224 are uniformly welded around the circumference of the rod-side connector 222, which are made of rolled threaded steel bars; the other end of the transverse reinforcing bars 224 extends through the side wall connecting groove 2212 into the expansion filler 227, and the free end of the transverse reinforcing bars 224, i.e., the end away from the rod-side connector 222, is welded with an elastic side reinforcing bar 225, which is made of steel. The core-filling precast block 221 is made of rolled sheet material, and the elastic side ribs 225 can abut against the inner wall of the core-taking hole 131 in the surface layer to improve the stability of the core-filling precast block 221. A vertically arranged stiffening rod 223 is welded on the rod-side connector 222. The stiffening rod 223 is made of rolled threaded steel bar. The top end of the stiffening rod 223 passes through the rod-side connector 222, and the bottom end of the stiffening rod 223 extends to the outside of the core-filling precast block 221 and passes through the pre-placed anchor tube 211. At the same time, the stiffening rod 223 is fixedly connected to the inner wall of the pre-placed anchor tube 211 by metal adhesive.

[0027] More specifically, the asphalt pavement body 10 also includes a pavement base course 11 and a subgrade soil 12. The pavement base course 11 is a cement-stabilized crushed stone base course, and the subgrade soil 12 is cohesive soil with a compaction degree of 96%. The pavement base course 11 is laid on the upper surface of the subgrade soil 12, and the pavement surface course 13 is laid on the upper surface of the pavement base course 11. Post-installed anchor holes 111 are provided on both the pavement base course 11 and the subgrade soil 12. The repair body 20 also includes a repair substrate 21, which includes pre-installed anchor pipes 211, grout at the bottom of the pipes 212, and grout-stabilized soil 213. The pre-installed anchor pipe 211 is made of rolled steel pipe. The bottom of the pre-installed anchor pipe 211 has multiple rows of grouting holes 2111. The pre-installed anchor pipe 211 is inserted into the post-installed anchor holes 111 of the road base 11 and the subgrade soil 12. The bottom of the pre-installed anchor pipe 211 is injected with pipe bottom grout 212. The pipe bottom grout 212 is located at the bottom end of the stiffening connecting rod 223. After being squeezed by the stiffening connecting rod 223, the pipe bottom grout 212 can be squeezed into the subgrade soil 12 through the grouting holes 2111 to form a grout-fixed soil body 213 fixed on the outer periphery of the pre-installed anchor pipe 211.

[0028] Furthermore, the expansion filler 227 is composed of thermosensitive expanding asphalt, fine aggregate, and glass fiber. The thermosensitive expanding asphalt is petroleum asphalt mixed with 5% to 10% thermally expanding microspheres, and the mass ratio of thermosensitive expanding asphalt to fine aggregate is 4% to 6%. The materials of the pipe bottom grouting body 212 and the bedding grouting binder 226 are the same, both of which are mainly composed of ordinary Portland cement, mixed with UEA expansion agent at a cement mass ratio of 0.1 to 0.15, silica fume at a cement mass ratio of 0.1 to 0.2 and a water-cement ratio of 0.4 to 0.5, and medium and fine sand at a cement mass ratio of 2 to 3.

[0029] This invention provides a method for repairing core holes in asphalt pavement, specifically including the following steps: S1, Precast core-filled precast block 221.

[0030] In this embodiment of the invention, the precast core block 221 is precast using SMA-20 medium-grained asphalt concrete, and its shape is basically cylindrical. The upper surface is an upwardly convex arch with a height of 0.4cm to 1.0cm. Multiple annular grouting grooves 2211 are evenly spaced at the bottom of the precast core block 221, and the cross-section of the grouting grooves 2211 is rectangular. Multiple side wall grooves 2212 are evenly distributed circumferentially on the outer periphery of the precast core block 221, and the cross-section of the side wall grooves 2212 is trapezoidal. A rod-side connector 222 is provided at the center of the precast core block 221, and the rod-side connector 222 is made of rolled steel plate. Multiple horizontally arranged transverse reinforcing bars 224 are evenly welded circumferentially to the rod-side connector 222. The lateral connecting bar 224 is made of rolled threaded steel bars; the other end of the transverse connecting bar 224 passes through the side wall connecting groove 2212 and extends to a certain length outside the core filling precast block 221; two elastic side bars 225 are welded to the end of the transverse connecting bar 224 away from the rod side connecting body 222. The two elastic side bars 225 are arranged in a figure-eight shape. The elastic side bars 225 are made of rolled steel sheets and can abut against the inner wall of the core hole 131 in the surface layer; a vertically arranged stiff connecting rod 223 is also welded on the rod side connecting body 222. The stiff connecting rod 223 is made of rolled threaded steel bars. The top end of the stiff connecting rod 223 passes through the rod side connecting body 222, and the bottom end of the stiff connecting rod 223 extends to a certain length outside the core filling precast block 221.

[0031] S2. Insert the pre-installed anchor pipe 211 into the post-installed anchor hole 111 of the road base layer 11 and the subgrade soil 12, and inject the bottom grout 212 into the pre-installed anchor pipe 211.

[0032] In this embodiment of the invention, the asphalt pavement body 10 comprises, from bottom to top, a pavement base layer 11, a subgrade soil 12, and a pavement surface layer 13 stacked sequentially. The pavement base layer 11 is a cement-stabilized crushed stone base layer, and the subgrade soil 12 is cohesive soil with a compaction degree of 96%. Post-installed anchor holes 111 of a certain depth and inner diameter are drilled in the pavement base layer 11 and the subgrade soil 12. These post-installed anchor holes 111 are located at the center of the surface layer core sampling hole 131, and the inner diameter of the post-installed anchor hole 111 is adapted to the outer diameter of the pre-installed anchor pipe 211 to facilitate the insertion of the pre-installed anchor pipe 211 into the post-installed anchor holes 111 in the pavement base layer 11 and the subgrade soil 12. A surface layer core sampling hole 131 for testing is excavated in the pavement surface layer 13. This surface layer core sampling hole 131 is a cylindrical hole with an inner diameter of 90mm~130mm. The aforementioned pre-filled core block 22... The outer diameter of the precast anchor pipe 211 is smaller than the inner diameter of the core sampling hole 131 of the surface layer so as to facilitate the subsequent placement of the precast core block 221 into the core sampling hole 131 of the surface layer. At the same time, the precast anchor pipe 211 is made of rolled steel pipe. Multiple rows of grouting holes 2111 are provided around the bottom of the precast anchor pipe 211. After the precast anchor pipe 211 is inserted into the post-anchor holes 111 of the road base 11 and the subgrade soil 12, a certain height of bottom grout 212 is injected into the precast anchor pipe 211. The height of the bottom grout 212 is 1 / 3 to 1 / 2 of the height of the precast anchor pipe 211. The bottom grout 212 is mainly composed of ordinary Portland cement, mixed with UEA expansion agent with a cement mass ratio of 0.1 to 0.15, silica fume with a cement mass ratio of 0.1 to 0.2 and a water-cement ratio of 0.4 to 0.5, and medium and fine sand with a cement mass ratio of 2 to 3.

[0033] S3. Lay a grout adhesive 226 at the bottom of the core hole 131 of the road surface layer 13; apply a metal adhesive to the bottom of the stiffening link 223.

[0034] In this embodiment of the invention, the material ratio of the grout bonding body 226 and the pipe bottom grouting body 212 is the same. A certain thickness of grout bonding body 226 is laid at the bottom of the core sampling hole 131 of the surface layer 13 so that when the core filling precast block 221 is placed in the core sampling hole 131, the grout bonding body 226 enters the grout connecting groove 2211 at the bottom of the core filling precast block 221 so that the lower surface of the core filling precast block 221 is firmly bonded to the upper surface of the road base layer 11. A metal adhesive is applied to the bottom of the stiffening link 223 so that when the bottom of the stiffening link 223 is inserted into the pre-placed anchor pipe 211, the stiffening link 223 is firmly bonded to the pre-placed anchor pipe 211.

[0035] S4. Place the core-filling precast block 221 into the core-taking hole 131 of the surface layer and make the bottom of the stiffening connecting rod 223 penetrate into the pre-installed anchor pipe 211.

[0036] In this embodiment of the invention, the diameter of the stiffening link 223 is adapted to the inner diameter of the pre-set anchor tube 211 so that the bottom of the stiffening link 223 can be inserted into the pre-set anchor tube 211. When the core filling precast block 221 is placed in the core extraction hole 131 of the surface layer, the bottom of the stiffening link 223 is aligned with the inner hole of the pre-set anchor tube 211 and the bottom of the stiffening link 223 penetrates into the pre-set anchor tube 211. At the same time, the lower surface of the core filling precast block 221 contacts the upper surface of the road base layer 11 so that the grout bonding body 226 enters the grout connecting groove 2211 at the bottom of the core filling precast block 221.

[0037] S5. Place the auxiliary repair mechanism 30 on the upper surface of the road surface layer 13 and span across the top of the filler precast block 221.

[0038] In this embodiment of the invention, the auxiliary repair mechanism 30 includes a compaction mechanism 31, a low-temperature ballast box 32, an annular support plate 33, and a temperature compensation belt 34. The compaction mechanism 31 is positioned across the top of the precast core block 221 to compact it. The annular support plate 33 is located on the upper surface of the pavement surface layer 13 and around the core sampling hole 131 to support the low-temperature ballast box 32 and limit the compaction mechanism 31. The annular support plate 33 is made of rolled steel plate and is circular in shape. The low-temperature ballast box 32 is located on the upper surface of the annular support plate 33 and around the core sampling hole 131 to reduce the temperature of the pavement surface layer 13 to a first temperature. The low-temperature ballast box 32 is made of rolled steel plate and is cylindrical in shape. It is filled with water-ice mixed salt 321 with a freezing point of -10℃ to -5℃. The temperature compensation belt 34 is located on the compaction mechanism 31 and above the core filling precast block 221 to raise the temperature of the core filling precast block 221 to a second temperature. Multiple temperature compensation belts 34 are provided and connected to an external heating source such as an industrial electric heating blanket. The heating temperature is 100℃ to 200℃.

[0039] Furthermore, the compaction mechanism 31 includes an arched pressure plate 311, an arched pressure beam 312, a connecting upright 313, a supporting crossbeam 314, a counter-pressure screw 315, a pressing nut 316, a guide column 317, and a sliding groove connecting plate 318. Among them, the arched pressure plate 311 is provided on the upper surface of the core-filling precast block 221. The arched pressure plate 311 is made of rolled steel plate, is circular and has an upward convex arch shape, and its curvature is consistent with the curvature of the upper surface of the core-filling precast block 221. The arched pressure plate 311 is provided with a filling injection pipe 35 to facilitate the subsequent injection of expansion filler 227 from the filling injection pipe 35 between the core-filling precast block 221 and the surface layer core hole 131. The arched pressure beam 312 is provided on the upper surface of the arched pressure plate 311. It is made of rolled steel plate, is circular and has an upward convex arch shape, and its curvature is consistent with the curvature of the upper surface of the arched pressure plate 311. Two guide posts 317 are symmetrically provided on the inner side of the annular support plate 33 and on the upper surface of the road surface layer 13. The guide posts 317 are made of rolled steel plate. The guide posts 317 have a horizontal crossbar on the side facing the surface layer core hole 131. The sliding channel 3171 has a T-shaped cross-section; the sliding connecting plate 318 is slidably disposed in the sliding channel 3171, and the outer edge of the arched pressure plate 311 is welded to two symmetrical sliding connecting plates 318 to facilitate the vertical movement of the arched pressure plate 311. The sliding connecting plate 318 is made of rolled steel plate; the outer sides of the two guide columns 317 are welded with counter-pressure screws 315, and the top of the counter-pressure screws 315 is fitted with a pressing nut 316; the two ends of the support beam 314 are fitted on the counter-pressure screws 315 and limited by the pressing nut 316. The support beam 314 is made of rolled square steel tube or section steel; multiple connecting uprights 313 are provided, and the multiple connecting uprights 313 are equally spaced. The two ends of the connecting uprights 313 are welded to the support beam 314 and the arched pressure beam 312 respectively. The connecting uprights 313 are made of rolled steel tube.

[0040] S6. The surface layer 13 around the core sampling hole 131 is cooled to a first temperature by the low temperature pressure box 32; the expansion filler 227 is injected into the outer periphery of the core filling precast block 221 by the filling injection pipe 35; and the core filling precast block 221 is heated to a second temperature by the temperature compensation belt 34.

[0041] In this embodiment of the invention, after the compaction mechanism 31, the low-temperature ballast box 32, the annular support plate 33, and the temperature compensation belt 34 are set up, the road surface layer 13 around the core hole 131 is first cooled to a first temperature, such as -5℃ to 0℃, through the low-temperature ballast box 32 to cause the road surface layer 13 to shrink. Then, the expansion filler 227 is injected into the space between the core precast block 221 and the core hole 131 through the filling injection pipe 35 until it is full. Then, the core precast block 221 is heated to a second temperature, such as 75℃ to 90℃, through the temperature compensation belt 34 so that the high temperature is transferred to the expansion filler 227 through the core precast block 221 so that the expansion filler 227 expands and compacts the gap between the core precast block 221 and the core hole 131.

[0042] Furthermore, the expandable filler 227 is composed of thermosensitive expandable asphalt, fine aggregate and glass fiber. The thermosensitive expandable asphalt is made by adding 5% to 10% thermally expandable microspheres to petroleum asphalt, and the mass ratio of thermosensitive expandable asphalt to fine aggregate is 4% to 6%.

[0043] S7. Pressure is applied to the arched pressure plate 311 by the compaction mechanism 31.

[0044] In this embodiment of the invention, after the temperature of the precast core block 221 is increased, the downward pressure is applied to the support beam 314 by the pressing nut 316 in the compaction mechanism 31. The support beam 314 then applies downward pressure to the arched pressure beam 312 through the connecting rod 313. The arched pressure beam 312 pushes the arched pressure plate 311 downward until it abuts against the upper surface of the precast core block 221 and applies downward pressure to the upper surface of the precast core block 221, so that the precast core block 221 is tightly connected with the expansion filler 227 and the grouting adhesive 226. At the same time, the stiffening connecting rod 223 can squeeze the bottom grouting body 212 from the grouting hole 2111 into the subgrade soil 12 and form a grout-solidified soil body 213 on the outer side of the bottom of the bottom grouting body 212.

[0045] S8. Remove the compaction mechanism 31, low-temperature ballast box 32, annular support plate 33 and temperature compensation belt 34 from the auxiliary repair mechanism 30.

[0046] This invention employs a combination of precast core-filling blocks and expandable fillers for the sealing and repair of coring holes in asphalt pavements. The expansion characteristics of the filler enhance the compaction effect between the precast core-filling blocks and the sidewalls of the coring holes. Simultaneously, a low-temperature ballast box lowers the surface temperature of the pavement, while a temperature compensation strip raises the temperature of the precast core-filling blocks. The low-temperature shrinkage and high-temperature softening properties of asphalt pavement materials further improve the compaction degree of the filling within the coring holes and the bonding strength of the coring hole interface. Furthermore, by designing the upper surface of the precast core-filling blocks as an upward-convex arch, the overhead traffic load can apply a downward pressure load to the precast core-filling blocks, improving pavement smoothness and preventing surface depressions after coring hole repair in asphalt pavements.

[0047] Furthermore, the methods for preparing and installing precast core blocks, the methods for injecting expansion fillers, the methods for injecting grout at the bottom of pipes, the methods for controlling the position of temperature compensation belts, and the methods for preparing low-temperature ballast boxes, etc., are all based on relevant existing technologies and construction standards, and will not be elaborated further in this embodiment of the invention.

[0048] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the invention to these descriptions. The present invention is applicable to single-compartment integrated utility tunnels and also to single-compartment power tunnels, both of which are within the scope of protection of this application. For those skilled in the art, any equivalent substitutions or obvious modifications made without departing from the inventive concept, resulting in identical performance or application, should be considered as falling within the scope of protection defined by the claims submitted herein.

Claims

1. A core hole repair structure for asphalt pavement, characterized in that, include: asphalt The road body (10) includes a road surface layer (13) and a surface core hole (131) is provided on the road surface layer (13). The repair body (20) is fixed in the surface core hole (131) by an auxiliary repair mechanism (30). The repair body (20) includes a repair body (22), which includes a core filling prefabricated block (221) and an expansion filler (227). The core filling prefabricated block (221) is located in the center of the surface core hole (131), and the expansion filler (227) is located on the outer periphery of the core filling prefabricated block (221).

2. The asphalt pavement core hole repair structure according to claim 1, characterized in that, The repair body (22) also includes a rod-side connector (222) and a transverse connecting rib (224). The rod-side connector (222) is provided in the core filling precast block (221). The rod-side connector (222) is evenly distributed with a plurality of transverse connecting ribs (224) in the circumference. The transverse connecting ribs (224) extend into the expansion filler (227).

3. The asphalt pavement core hole repair structure according to claim 2, characterized in that, The outer periphery of the core-filling precast block (221) is evenly distributed with multiple side wall connecting grooves (2212), and the expansion filler (227) is provided in the side wall connecting groove (2212). The transverse connecting rib (224) penetrates the expansion filler (227) in the side wall connecting groove (2212).

4. The asphalt pavement core hole repair structure according to claim 2, characterized in that, The asphalt pavement body (10) also includes a pavement base layer (11) and a subgrade soil (12). The pavement base layer (11) is stacked on the upper surface of the subgrade soil (12). The repair body (20) also includes a repair base (21). The repair base (21) includes a pre-installed anchor pipe (211). The pre-installed anchor pipe (211) is inserted into the pavement base layer (11) and the subgrade soil (12). The repair body (22) also includes a stiffening link (223). One end of the stiffening link (223) passes through the rod side connector (222) and the other end passes into the pre-installed anchor pipe (211).

5. The asphalt pavement core hole repair structure according to claim 4, characterized in that, The repair substrate (21) also includes a pipe bottom grouting body (212) and a grout-stabilized soil body (213). The pipe bottom grouting body (212) is located at the bottom of the pre-installed anchor pipe (211) and at the bottom end of the stiffening connecting rod (223). The grout-stabilized soil body (213) is located at the bottom of the outer periphery of the pre-installed anchor pipe (211).

6. The asphalt pavement core hole repair structure according to claim 4, characterized in that, The repair body (22) also includes a grout bonding body (226). The bottom of the core filling precast block (221) is provided with a plurality of annular grout connecting grooves (2211). The grout connecting grooves (2211) are provided with the grout bonding body (226). The grout bonding body (226) is provided on the upper surface of the road base layer (11).

7. The asphalt pavement core hole repair structure according to any one of claims 1 to 6, characterized in that, The upper surfaces of the core-filling precast block (221) and the expanded filler (227) are designed to be convex arched.

8. The asphalt pavement core hole repair structure according to any one of claims 2 to 6, characterized in that, The transverse connecting rib (224) is provided with an elastic side rib (225) at the end away from the rod side connector (222), and the elastic side rib (225) abuts against the inner wall of the surface core hole (131).

9. A method for repairing core holes in asphalt pavement, applied to the repair structure described in any one of claims 1-8, characterized in that, Includes the following steps: Precast core-filled precast block (221); the core-filled precast block (221) is provided with a rod-side connector (222), a transverse connecting rib (224) and a rigid connecting rod (223). The rod-side connector (222) is evenly distributed with a plurality of transverse connecting ribs (224) in the circumferential direction. The transverse connecting ribs (224) extend to the outside of the core-filled precast block (221). The outer end of the transverse connecting ribs (224) is provided with an elastic side rib (225). One end of the rigid connecting rod (223) passes through the rod-side connector (222) and the other end extends to the outside of the core-filled precast block (221). A pre-installed anchor pipe (211) is inserted into the post-installed anchor hole (111) of the road base (11) and the subgrade soil (12), and the bottom grout (212) is injected into the pre-installed anchor pipe (211); the bottom of the pre-installed anchor pipe (211) is provided with multiple rows of grouting holes (2111) in the circumferential direction. A grout adhesive (226) is laid at the bottom of the core hole (131) of the road surface layer (13); a metal adhesive is applied to the bottom of the stiffening link (223); The core-filling precast block (221) is placed in the surface core-taking hole (131) and the bottom of the stiffening connecting rod (223) is inserted into the pre-installed anchor pipe (211); The auxiliary repair mechanism (30) is placed on the upper surface of the road surface layer (13) and spans across the top of the core-filling precast block (221); the auxiliary repair mechanism (30) includes an arched pressure plate (311) on the upper surface of the core-filling precast block (221), a low-temperature pressure box (32) on the upper surface of the road surface layer (13) and on the outer periphery of the core-taking hole (131) of the surface layer, multiple temperature compensation strips (34) on the upper surface of the arched pressure plate (311), and a compaction mechanism (31) directly above the arched pressure plate (311); the arched pressure plate (311) is provided with a filling injection pipe (35). The road surface layer (13) around the core sampling hole (131) is cooled to a first temperature by the low-temperature pressure box (32); an expansion filler (227) is injected into the outer periphery of the core filling precast block (221) through the filling injection pipe (35); and the core filling precast block (221) is heated to a second temperature by the temperature compensation band (34). Pressure is applied to the arched pressure plate (311) by the compaction mechanism (31) so that the core filling precast block (221) is tightly connected with the expansion filler (227) and the grouting adhesive (226) and the bottom grouting body (212) is squeezed into the subgrade soil (12) from the grouting hole (2111) by the stiffening rod (223) to form grout-stabilized soil (213).

10. The method for repairing core holes in asphalt pavement according to claim 9, characterized in that, The auxiliary repair mechanism (30) further includes an annular support plate (33) laid on the upper surface of the road surface layer (13), on which the low-temperature ballast box (32) is arranged, and the low-temperature ballast box (32) contains water-ice mixed salt (321); the compaction mechanism (31) includes two guide columns (317) symmetrically arranged on the inner side of the annular support plate (33), a counter-pressure screw (315) arranged on the guide columns (317), and two ends of... A supporting beam (314) is connected to the counter-pressure screw (315), and an arched pressure beam (312) is connected to the supporting beam (314) through multiple connecting rods (313). The arched pressure beam (312) is located on the upper surface of the arched pressure plate (311). The arched pressure plate (311) is slidably connected to the guide column (317) through a sliding groove connecting plate (318). Multiple temperature compensation strips (34) are arranged on the upper surface of the arched pressure beam (312).

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