Construction method for asphalt replaceable pavement for large passenger aircraft test

Abstract

A construction method for an asphalt replaceable pavement (1) for a large passenger aircraft test, the construction method comprising the following steps: S1, roughening a concrete top surface and treating map cracking; S2, performing surveying and setting out, and performing pouring to form a leveling layer; S3, laying a rubber plate; S4, mounting formwork, binding steel bars, pre-burying an anchor-plate sleeve suspension member (14), and performing pouring to form a base layer (11); S5, mounting formwork, and performing paving and compaction to form an asphalt sand stress absorption layer (12); S6, mounting formwork, and performing paving and compaction to form an asphalt concrete layer (13); S7, performing integral joint-cutting on the asphalt sand stress absorption layer (12) and the asphalt concrete layer (13) according to a design size, separating into blocks, and numbering for each block; S8, mounting a lifting screw in the anchor-plate sleeve suspension member (14), hoisting the asphalt replaceable pavement (1) by means of a crane, and mounting edge-covering angle steel at four corners; S9, mounting a longitudinal expansion joint plate and a transverse joint plate, and mounting the asphalt replaceable pavement (1); and S10, filling the longitudinal expansion joint plate with a joint filler. The method has the advantages of achieving high prefabrication precision and meeting the requirement for rapid mounting.

Description

A construction method for asphalt replaceable pavement for large aircraft testing Technical Field

[0001] The present invention relates to the technical field of pavement structures, and in particular to a construction method of an asphalt replaceable pavement for large aircraft testing. Background Art

[0002] The large aircraft ground dynamics test platform is the first test platform in the relevant field in China. It is of great significance and far-reaching impact. After completion, it will test various aircraft tires, wheel brakes, and landing gear systems, as well as high-speed dynamic characteristics on different road surfaces and large sideslip angle dynamic characteristics on real runways. It will collect basic data, break the foreign monopoly on basic data on key technologies, and fill a gap in China.

[0003] The test platform uses a test rig to simulate large aircraft to conduct dynamic tests on different pavement structures. It is now necessary to provide an asphalt replaceable pavement that can be quickly assembled into an aircraft test pavement during the test. The construction difficulty lies in its high flatness and precision requirements. It must not only meet the requirements of rapid installation, but also avoid asphalt collapse during the installation process.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a construction method for an asphalt replaceable pavement for large aircraft testing that has high prefabrication accuracy and meets the requirements of rapid lifting and installation.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for constructing an asphalt replaceable pavement for large aircraft testing, wherein the asphalt replaceable pavement is laid in a groove of a cap, comprising the following steps:

[0008] S1: Cut the steel bar heads on the side of the cap groove and grind and level the uneven areas of the concrete. Roughen the top surface of the groove concrete and deal with the mesh cracks.

[0009] S2: Measure and set out, check the groove position and elevation, and pour the fine stone concrete leveling layer;

[0010] S3: Laying rubber sheets in the grooves;

[0011] S4: Installing the formwork, installing and tying the steel bars, pre-buried the anchor plate type sleeve suspension parts for hoisting the asphalt replaceable pavement, and pouring the base layer using the skipping method, wherein the base layer is set as a reinforced concrete layer;

[0012] S5: Install formwork, transport, spread and compact asphalt sand stress absorption layer;

[0013] S6: Install formwork, transport, spread and compact asphalt concrete layer;

[0014] S7: After the asphalt cools to room temperature, the asphalt sand stress absorption layer and the asphalt concrete surface layer are cut according to the designed dimensions, and divided into sections and numbered one by one;

[0015] S8: Install hanging nails in the anchor plate sleeve suspension, use a crane to lift out the asphalt replaceable pavement, and install the edge angle steel at the four corners;

[0016] S9: Install longitudinal expansion joint plates, transverse joint plates, and asphalt replaceable pavement;

[0017] S10: Fill the top of the longitudinal expansion joint with filler.

[0018] As a further improvement of the above technical solution:

[0019] In step S1, cracks with a width less than 0.15 mm are directly roughened, and cracks with a width greater than 0.15 mm are chiseled open to a width of 50 mm. The mortar and loose layers are cleaned with a large vacuum cleaner and high-pressure water, and then sealed with a leveling layer of concrete.

[0020] In step S2, the fine stone concrete is designed to be C30, poured to the elevation, vibrated and compacted, and then scraped and leveled, and then covered with a permeable geotextile and watered for curing.

[0021] In step S3, the rubber sheet is an industrial hard rubber sheet, a plastic film is laid on the surface of the hard rubber sheet and a release agent is applied.

[0022] In step S4, the template includes a side template and a transverse end template. The side template adopts a hard foam board, the surface of the hard foam board is covered with a plastic film and a release agent is brushed on it. The transverse end template is set as a plastic tempered template, and a release agent is brushed on the surface. When the skip-bin method is used for construction, the transverse template adopts a hard foam board, the surface of the template is covered with a plastic film and a release agent is brushed on it.

[0023] In step S4, the concrete design grade of the base layer is C40, and a vibrating rod is used to compact it after pouring.

[0024] In step S4, during vibration, the vibrating rod is inserted quickly and pulled out slowly, and the vibration time is controlled within 15-20 seconds. The moving distance of the vibrating rod in the concrete is not greater than 50 cm.

[0025] In step S5, tack coat oil is sprayed before paving the asphalt sand stress absorbing layer.

[0026] In step S6, tack coat oil is sprayed before paving the asphalt concrete, and the asphalt concrete layer is paved in layers, with tack coat oil provided between the layers.

[0027] The tack coat oil is configured as cationic modified emulsified asphalt.

[0028] In step S9, the expansion joint plate is a polyurethane hard foam plate, and the transverse joint plate is an industrial hard rubber gasket.

[0029] In step S10, the sealant is a high polyurethane or silicone sealant.

[0030] Compared with the prior art, the advantages of the present invention are:

[0031] The present invention provides a construction method for an asphalt replaceable pavement for large aircraft testing. The method ensures the fit between the asphalt replaceable pavement and the pedestal by prefabricating the asphalt replaceable pavement in situ in the pedestal groove, solves the problems of prefabrication flatness, elevation and accuracy, and prevents the asphalt concrete layer from collapsing during lifting by providing a high-strength reinforced concrete layer as a base layer. Anchor plate type sleeve suspension parts are pre-embedded in the base layer. During lifting, hanging nails are installed in the anchor plate type sleeve suspension parts for lifting. The lifting and installation are convenient and quick. After installation, the hanging nails are removable, thereby ensuring the flatness of the asphalt replaceable pavement. The stress is absorbed by laying rubber sheets and asphalt sand stress absorption layers, which plays a buffering role and improves the durability and fatigue resistance of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a partial structural schematic diagram (sectional view) of the asphalt replaceable pavement of the present invention.

[0033] FIG2 is a schematic diagram of the asphalt replaceable pavement of the present invention after being installed on the cap.

[0034] FIG3 is a construction flow chart of the present invention.

[0035] The reference numerals in the figure indicate: 1. asphalt replaceable pavement; 11. base layer; 12. asphalt sand stress absorption layer; 13. asphalt concrete layer; 14. anchor plate sleeve suspension; 2. pedestal. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] As shown in FIG1 to FIG3, the construction method of the asphalt replaceable pavement for large aircraft testing of this embodiment, the asphalt replaceable pavement 1 is laid in the groove of the base 2, and includes the following steps:

[0038] S1: Cut the steel bar heads on the side of the groove of the platform 2, grind and level the uneven areas of the concrete, and roughen the top surface of the groove concrete and deal with the reticular cracks;

[0039] S2: Measure and set out, check the groove position and elevation, and pour the fine stone concrete leveling layer;

[0040] S3: Laying rubber sheets in the grooves;

[0041] S4: Install the formwork, install and tie the steel bars, pre-embed the anchor plate type sleeve suspension member 14 for hoisting the asphalt replaceable pavement 1, and cast the base layer 11 using the skipping method. The base layer 11 is set as a reinforced concrete layer;

[0042] S5: Install formwork, transport, spread, and compact the asphalt sand stress absorption layer 12;

[0043] S6: Install formwork, transport, spread and compact asphalt concrete layer 13;

[0044] S7: After the asphalt cools to room temperature, the asphalt sand stress absorption layer 12 and the asphalt concrete surface layer 13 are cut as a whole according to the designed dimensions, and are divided into sections and numbered one by one;

[0045] S8: Install hanging nails in the anchor plate sleeve suspension member 14, use a crane to lift out the asphalt replaceable pavement 1, and install the edge angle steels at the four corners;

[0046] S9: Install longitudinal expansion joint plates, transverse joint plates, and install asphalt replaceable pavement 1;

[0047] S10: Fill the top of the longitudinal expansion joint with filler.

[0048] The method ensures the fit between the asphalt replaceable pavement 1 and the cap 2 by prefabricating the asphalt replaceable pavement 1 in situ in the groove of the cap 2, solves the problems of prefabrication flatness, elevation and accuracy, and prevents the asphalt concrete layer 13 from collapsing during lifting by setting a high-strength reinforced concrete layer as the base layer 11. Anchor plate type sleeve suspension parts 14 are pre-embedded in the base layer 11. During lifting, hanging nails are installed in the anchor plate type sleeve suspension parts 14 for lifting. The lifting and installation are convenient and fast. After installation, the hanging nails are removable, thereby ensuring the flatness of the asphalt replaceable pavement 1. The stress is absorbed by laying rubber sheets and asphalt sand stress absorption layers 12, which plays a buffering role and improves the durability and fatigue resistance of the overall structure.

[0049] In this embodiment, in step S1, cracks with a width of less than 0.15 mm are directly roughened. Cracks with a width greater than 0.15 mm are chiseled open to a width of 50 mm. The mortar and loose layers are cleaned with a large vacuum cleaner and high-pressure water, and then a leveling layer of concrete is poured and sealed simultaneously. After the cracks are treated and the concrete surface is roughened, the concrete on the base cap is well bonded to the newly poured concrete.

[0050] In this embodiment, in step S2, fine aggregate concrete with a design grade of C30 is poured to the elevation, vibrated and compacted, and then scraped flat. A permeable geotextile is then applied and watered for curing. After compaction, an aluminum alloy square plate is used with an iron trowel to scrape the surface flat to a surface smoothness of less than 3 mm. This prevents surface cracking and unevenness, which could cause stress during testing and cracking of the asphalt replaceable pavement 1.

[0051] In this embodiment, in step S3, the rubber sheet is an industrial hard rubber sheet, and a plastic film is laid on the surface of the hard rubber sheet and a mold release agent is applied. The industrial hard rubber sheet has a good cushioning effect and is less deformed under pressure, thereby improving the stability of the road surface structure.

[0052] In this embodiment, in step S4, the template includes a side template and a transverse end template. The side template adopts a hard foam board, and a plastic film is laid on the surface of the hard foam board and a release agent is brushed. The transverse end template is set as a plastic tempered template, and a release agent is brushed on the surface. When the skip-bin method is used for construction, the transverse template adopts a hard foam board, and a plastic film is laid on the surface of the template and a release agent is brushed.

[0053] In this embodiment, in step S4, the concrete design grade of the base layer 11 is C40, and a vibrating rod is used to compact it after pouring.

[0054] In this embodiment, in step S4, during vibration, the vibrating rod is inserted quickly and pulled out slowly, the vibration time is controlled within 15-20 seconds, and the moving distance of the vibrating rod in the concrete is no more than 50 cm.

[0055] In this embodiment, in step S5, tack coat oil is sprayed before paving the asphalt sand stress-absorbing layer 12. Before spraying the tack coat oil, the base layer 11 is milled using a small milling machine. After milling, debris and dust from the concrete surface are collected using a large vacuum cleaner and then rinsed clean with high-pressure water. Before spraying the tack coat oil, the surface is ensured to be dry. This spraying of the tack coat oil ensures good adhesion between the asphalt sand stress-absorbing layer 12 and the base layer 11.

[0056] In this embodiment, the asphalt sand is transported to the site by a new environmentally friendly vehicle with eight rear wheels, and then loaded into a 5t small dump truck by a loader and transported to the paving position. It is spread by a very compact small paver, and different rollers are used for initial compaction, secondary compaction, and final compaction in sequence. Initial compaction: static compaction is performed by a 12t double steel wheel roller once, secondary compaction is performed by a 12t double steel wheel roller with weak vibration once, and strong vibration compaction is performed by a 10t front steel and rear rubber wheel roller 2-4 times. Final compaction: static compaction is performed by a 10t front steel and rear rubber wheel roller 1-2 times, and a small flat rammer is used to compact the area around the anchor plate sleeve suspension 14.

[0057] In this embodiment, in step S6, tack coat oil is sprayed before paving the asphalt concrete. The asphalt concrete layer 13 is paved in layers, with tack coat oil applied between the layers. The asphalt concrete layer 13 is paved in two layers, with coarse-grained AC-25C asphalt concrete and fine-grained SMA-13C asphalt concrete arranged in descending order of particle size. This two-layer structure enhances durability and fatigue resistance. The tack coat oil is applied at a rate of 0.3-0.6 kg per cubic meter. Spraying the tack coat oil ensures good adhesion between the asphalt concrete layers.

[0058] In this embodiment, a threaded steel pipe with the same height as the asphalt concrete layer 13 is threadedly connected to the anchor plate sleeve suspension 14. The threaded steel pipe is also divided into two sections for installation according to the height of the asphalt concrete to be paved in layers. When the asphalt concrete layer 13 is being paved, a cover is set on the threaded steel pipe to seal it to prevent the asphalt concrete from falling in and causing blockage. When the asphalt replaceable pavement 1 needs to be lifted, a hanging nail is threadedly connected to the threaded steel pipe and lifted by a crane. After the lifting is completed, the hanging nail is removed and the cover is covered to maintain the flatness of the pavement.

[0059] In this embodiment, before paving the first layer of coarse-grained AC-25C asphalt concrete, the first section of the threaded steel pipe on the anchor plate sleeve suspension 14 is sealed with a cover, the coarse-grained AC-25C asphalt concrete is transported to the site by a new type of environmentally friendly vehicle with eight rear wheels, and then transported to a 5t small dump truck by a loader and transported to the paving position. It is paved with a very compact small paver, and different rollers are used for initial compaction, re-compaction, and final compaction in sequence. Initial compaction: static compaction with a 12t double steel wheel roller for 1 time, re-compaction with a 12t double steel wheel roller for 2 times with weak vibration, and strong vibration rolling with a 10t front steel and rear rubber wheel roller for 2-3 times. Final compaction: static compaction with a 30t rubber wheel roller for 2-3 times. Before paving the second layer of fine-grained SMA-13C concrete, the first section of the threaded steel pipe is removed by chiseling. Asphalt concrete is laid around the corrugated steel pipe. The cover is taken out and the second section of threaded steel pipe is installed on the first section of threaded steel pipe. The elevation of the second section of threaded steel pipe is consistent with the elevation of the second layer of fine-grained SMA-13C concrete. The chiseled area around the first section of steel pipe is sealed with asphalt concrete and compacted with a flat plate. The second section of threaded steel pipe is sealed with a cover. The fine-grained SMA-13C concrete is transported to the site by a new type of environmentally friendly vehicle with eight rear wheels. It is then transported to a 5t small dump truck by a loader and transported to the paving position. It is paved with a very compact small paver. Different rollers are used for initial compaction, re-compaction and final compaction. Initial compaction: static compaction with a 12t double steel wheel roller for 1-2 times, re-compaction with a 12t double steel wheel roller for 2-3 times with weak vibration and 2-3 times with strong vibration. Final compaction: Use a steel-front and rubber-back roller to perform static compaction 1-2 times to finish the surface, and check that the flatness is no more than 3mm to ensure the compaction of the two layers of asphalt concrete. Spread continuously along the entire length to ensure flatness.

[0060] In this embodiment, the adhesive layer oil is set to cationic modified emulsified asphalt, which has a good bonding effect.

[0061] In this embodiment, in step S9, the expansion joint plates are polyurethane hard foam plates, and the transverse joint plates are industrial hard rubber gaskets.

[0062] In this embodiment, in step S10, the caulking material is a high polyurethane or silicone caulking material, which has a good sealing effect and strong waterproof performance.

[0063] Although the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, utilize the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A construction method for an asphalt replaceable pavement for large aircraft testing, wherein the asphalt replaceable pavement (1) is laid in a groove of a cap (2), characterized in that: The following steps are involved: S1: cutting the steel bar heads on the side of the groove of the cap (2), grinding and leveling the uneven concrete areas, roughening the top surface of the groove concrete and treating the mesh cracks; S2: Measure and set out, check the groove position and elevation, and pour the fine stone concrete leveling layer; S3: Laying a rubber sheet in the groove; S4: installing the formwork, installing and tying the steel bars, pre-buried the anchor plate type sleeve suspension member (14) for hoisting the asphalt replaceable pavement (1), and casting the base layer (11) by the skipping method, wherein the base layer (11) is set as a reinforced concrete layer; S5: Installing formwork, transporting, paving, and compacting the asphalt sand stress absorbing layer (12); S6: Installing formwork, transporting, paving and compacting the asphalt concrete layer (13); S7: After the asphalt is cooled to room temperature, the asphalt sand stress absorption layer (12) and the asphalt concrete surface layer (13) are cut as a whole according to the designed size, and are divided into sections and numbered one by one; S8: Install a hanging nail in the anchor plate type sleeve suspension member (14), use a crane to lift out the asphalt replaceable pavement (1), and install the edge angle steels at the four corners; S9: Install longitudinal expansion joint plates, transverse joint plates, and install asphalt replaceable pavement (1); S10: Fill the top of the longitudinal expansion joint with filler.

2. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 1 is characterized by: In step S1, cracks with a width less than 0.15 mm are directly roughened, and cracks with a width greater than 0.15 mm are chiseled open to a width of 50 mm. The mortar and loose layers are cleaned with a large vacuum cleaner and high-pressure water, and then closed with leveling layer concrete.

3. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 2 is characterized by: In step S2, the fine stone concrete is designed as C30, poured to the elevation, vibrated and compacted, and then scraped and leveled, and covered with a permeable geotextile and watered for curing.

4. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 3 is characterized by: In step S3, the rubber sheet is an industrial hard rubber sheet, a plastic film is laid on the surface of the hard rubber sheet and a mold release agent is applied.

5. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 4 is characterized by: In step S4, the template includes a side template and a transverse end template. The side template adopts a hard foam board, and a plastic film is laid on the surface of the hard foam board and a release agent is brushed. The transverse end template is set as a plastic tempered template, and a release agent is brushed on the surface. When the skip-bin method is used for construction, the transverse template adopts a hard foam board, and a plastic film is laid on the surface of the template and a release agent is brushed.

6. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 5 is characterized by: In step S4, the concrete design number of the base layer (11) is C40, and after pouring, it is vibrated and compacted using a vibrating rod.

7. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 6, characterized in that: In step S4, during vibration, the vibrating rod is inserted quickly and pulled out slowly, and the vibration time is controlled within 15-20 seconds. The moving distance of the vibrating rod in the concrete is not greater than 50 cm.

8. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 7, characterized in that: In step S5, tack coat oil is sprayed before paving the asphalt sand stress absorbing layer (12).

9. The method for constructing asphalt replaceable pavement for large aircraft testing according to claim 8, characterized in that: In step S6, tack coat oil is sprayed before paving the asphalt concrete, and the asphalt concrete layer (13) is paved in layers, with tack coat oil being provided between the layers.

10. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 9, characterized in that: The tack coat oil is cationic modified emulsified asphalt.

11. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 10, characterized in that: In step S9, the expansion joint plate is a polyurethane hard foam plate, and the transverse joint plate is an industrial hard rubber gasket.

12. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 11, characterized in that: In step S10, the sealant is a high-polyurethane or silicone sealant.

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