A construction method for asphalt replaceable pavement for large aircraft testing

Abstract

The invention discloses a construction method of an asphalt replaceable pavement for large aircraft testing, comprising the following steps: S1: roughening the top surface of concrete and processing mesh cracks; S2: measuring and setting out, pouring a leveling layer; S3: laying a rubber sheet; S4: installing a template, tying steel bars, pre-embedding an anchor plate type sleeve suspension, and pouring a base layer; S5: installing a template, paving and compacting an asphalt sand stress absorption layer; S6: installing a template, paving and compacting an asphalt concrete layer; S7: cutting the asphalt sand stress absorption layer and the asphalt concrete layer as a whole according to the design size, and dividing and numbering them piece by piece; S8: installing a hanging nail in the anchor plate type sleeve suspension, using a crane to hoist the asphalt replaceable pavement, and installing hemming angle steels at the four corners; S9: installing a longitudinal expansion joint plate and a transverse joint plate, and installing the asphalt replaceable pavement; S10: filling the longitudinal expansion joint plate top with a filler. The method has the advantages of high prefabrication accuracy and meeting the requirements of rapid installation.

Description

Technical Field

[0001] The 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, landing gear systems, high-speed dynamic characteristics on different pavement surfaces and large sideslip angle dynamic characteristics on real runways, collect basic data, 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 requirements for flatness and precision. It must not only meet the requirements of rapid installation, but also avoid asphalt collapse during the installation process. Summary of the invention

[0004] 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 which has high prefabrication accuracy and meets the requirements of rapid lifting and installation.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A construction method of 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:

[0007] S1: Cut the steel bar head on the side of the groove of the cap, grind and level the uneven concrete, and roughen the top surface of the groove concrete and deal with the mesh cracks;

[0008] S2: Measure and set out, check the groove position and elevation, and pour the fine stone concrete leveling layer;

[0009] S3: Laying a rubber sheet in the groove;

[0010] 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 casting the base layer by skipping method, wherein the base layer is set as a reinforced concrete layer;

[0011] S5: Install formwork, transport, spread and compact asphalt sand stress absorption layer;

[0012] S6: Install formwork, transport, spread and compact asphalt concrete layer;

[0013] S7: After the asphalt cools to room temperature, the asphalt sand stress absorption layer and the asphalt concrete layer are cut as a whole according to the designed size, and divided into sections and numbered one by one;

[0014] S8: Install the nails in the anchor plate sleeve suspension, use a crane to lift the asphalt replaceable pavement, and install the edge angle steel at the four corners;

[0015] S9: Install longitudinal expansion joint plates, transverse joint plates, and install asphalt replaceable pavement;

[0016] S10: Fill the top of the longitudinal expansion joint with filler.

[0017] As a further improvement of the above technical solution:

[0018] 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.

[0019] 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.

[0020] In step S3, the rubber sheet is an industrial hard rubber sheet, and a plastic film is laid on the surface of the industrial hard rubber sheet and a release agent is applied.

[0021] 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 end template adopts a hard foam board, and a plastic film is laid on the surface of the template and a release agent is brushed.

[0022] In step S4, the concrete design number of the base layer is C40, and a vibrating rod is used to compact it after pouring.

[0023] 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.

[0024] In step S5, tack coat oil is sprayed before paving the asphalt sand stress absorbing layer.

[0025] 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.

[0026] The tack coat oil is cationic modified emulsified asphalt.

[0027] In step S9, the expansion joint plate is a polyurethane hard foam plate, and the transverse joint plate is an industrial hard rubber gasket.

[0028] In step S10, the sealant is a high-polyurethane or silicone sealant.

[0029] Compared with the prior art, the advantages of the present invention are:

[0030] The present invention provides a construction method for an asphalt replaceable pavement used for large aircraft testing. The method ensures the fit between the asphalt replaceable pavement and the cap by prefabricating the asphalt replaceable pavement in situ in the cap groove, solves the problems of prefabrication flatness, elevation and precision, 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-buried 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. 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

[0031] Figure 1 It is a partial structural schematic diagram (cross-sectional view) of the asphalt replaceable pavement of the present invention.

[0032] Figure 2 It is a schematic diagram of the asphalt replaceable pavement of the present invention after being installed on the cap.

[0033] Figure 3 It is a construction flow chart of the present invention.

[0034] The symbols in the figure represent:

[0035] 1. Asphalt replaceable pavement; 11. Base layer; 12. Asphalt sand stress absorption layer; 13. Asphalt concrete layer; 14. Anchor plate sleeve suspension; 2. Capping platform. DETAILED DESCRIPTION

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

[0037] like Figures 1 to 3 As shown, the construction method of the asphalt replaceable pavement for large aircraft testing in this embodiment, the asphalt replaceable pavement 1 is laid in the groove of the cap 2, including the following steps:

[0038] S1: Cut the steel bar head on the side of the groove of the cap 2, grind and level the uneven concrete, and roughen the top surface of the groove concrete and deal with the mesh cracks;

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

[0040] S3: Laying a rubber sheet in the groove;

[0041] 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, casting the base layer 11 by the skipping method, and setting the base layer 11 as a reinforced concrete layer;

[0042] S5: Installing formwork, transporting, paving, and compacting the asphalt sand stress absorbing layer 12;

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

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

[0045] S8: Install the hanging nails in the anchor plate type sleeve suspension member 14, use a crane to lift 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 precision, and prevents the asphalt concrete layer 13 from collapsing during lifting by setting a high-strength reinforced concrete layer as the base layer 11. An anchor plate sleeve suspension member 14 is pre-buried in the base layer 11. During lifting, hanging nails are installed in the anchor plate sleeve suspension member 14 for lifting. The lifting and installation are convenient and quick. After installation, the hanging nails are removable, which ensures the flatness of the asphalt replaceable pavement 1. The rubber sheet and asphalt sand stress absorption layer 12 are laid to absorb stress, 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 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 and cleaned with a large vacuum cleaner and high-pressure water, and then the leveling layer concrete is poured and sealed synchronously. After the cracks are treated and the concrete surface is roughened, the concrete on the surface of the cap is well combined with the newly poured concrete.

[0050] In this embodiment, in step S2, the fine stone concrete is designed as C30, poured to the elevation, vibrated and compacted, and then scraped and smoothed, and covered with a permeable geotextile for watering and curing. After vibrating and compacting, an aluminum alloy square plate is used in combination with an iron trowel to scrape and smooth the surface, ensuring that the surface flatness is less than 3 mm, preventing surface cracking and preventing unevenness from causing stress generated during the test to cause the asphalt replaceable pavement 1 to break.

[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 industrial hard rubber sheet and a mold release agent is applied. The industrial hard rubber sheet has a good buffering effect and small deformation after being subjected to pressure, thereby improving the stability of the pavement 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 end 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 number 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 to be 15-20 seconds, and the moving distance of the vibrating rod in the concrete is not greater 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, a small milling machine is used to mill the surface of the base layer 11. After milling, the slag and dust on the concrete surface are absorbed by a large vacuum cleaner and washed clean with high-pressure water. Before spraying the tack coat oil, the surface is ensured to be dry. By spraying the tack coat oil, the asphalt sand stress absorbing layer 12 and the base layer 11 are ensured to be well bonded.

[0056] In this embodiment, the asphalt sand 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 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 compaction is performed by a 10t front steel and rear rubber wheel roller with strong vibration for 2-4 times. Final compaction: static compaction is performed by a 10t front steel and rear rubber wheel roller for 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 asphalt concrete, and the asphalt concrete layer 13 is paved in layers, with tack coat oil set between the layers. The asphalt concrete layer 13 is paved in two layers, and is sequentially set to coarse-grained AC-25C asphalt concrete and fine-grained SMA-13C asphalt concrete according to the particle size. It is set to a two-layer structure with particle sizes from large to small, which enhances durability and fatigue resistance. The amount of tack coat oil sprayed is 0.3-0.6 kg per cubic meter, and spraying tack coat oil ensures good bonding of the asphalt concrete between the 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 provided on the threaded steel pipe for sealing 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 closed 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 by a very compact small paver, and different rollers are used for initial compaction, re-compacting, and final compaction in sequence. Initial compaction: static compaction once with a 12t double steel wheel roller, re-compacting twice with a 12t double steel wheel roller with weak vibration, and strong vibration rolling 2-3 times with a 10t front steel and rear rubber wheel roller, and final compaction: static compaction 2-3 times with a 30t rubber wheel roller; before paving the second layer of fine-grained SMA-13C concrete, the asphalt concrete around the first section of the threaded steel pipe is chiseled off, the cover is taken out, and the second section of the threaded steel pipe is installed on the first section of the threaded steel pipe. The first section of the threaded steel pipe, the second section of the threaded steel pipe elevation is consistent with the second layer of fine-grained SMA-13C concrete elevation, the first section of the steel pipe around the chiseled area is blocked with asphalt concrete, compacted with a flat plate, and the second section of the threaded steel pipe is closed with a lid. The fine-grained SMA-13C concrete is transported to the site by a new type of environmentally friendly vehicle with eight 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: 12t double steel wheel roller is used for static compaction 1-2 times, re-compaction is carried out with 12t double steel wheel roller with weak vibration 2-3 times, and strong vibration 2-3 times. Final compaction: front steel and rear rubber roller is used for static compaction 1-2 times to finish the surface, and the flatness is checked to be no more than 3mm, so as to ensure the compaction of the two layers of asphalt concrete, and the flatness is ensured by continuous paving throughout the length.

[0060] In this embodiment, the adhesive layer oil is set as 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 sealant is a high polyurethane or silicone sealant, which has good sealing effect and strong waterproof performance.

[0063] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for constructing 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: Cut the steel bar heads on the side of the groove of the cap (2), grind and level the uneven areas of the concrete, and roughen the top surface of the groove concrete and treat the mesh cracks; S2: Measure and set out, check the groove position and elevation, and pour the fine stone concrete leveling layer; S3: Laying an industrial hard rubber sheet in the groove, laying a plastic film on the surface of the industrial hard rubber sheet and applying a release agent; 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: Install formwork, transport, spread and compact asphalt concrete layer (13); S7: After the asphalt is cooled to room temperature, the asphalt sand stress absorption layer (12) and the asphalt concrete 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 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 end template adopts a hard foam board, and a plastic film is laid on the surface of the template and a release agent is brushed.

5. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 4 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.

6. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 5 is characterized by: 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.

7. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 6, characterized in that: In step S5, tack coat oil is sprayed before paving the asphalt sand stress absorbing layer (12).

8. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 7, 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.

9. The method for constructing an asphalt replaceable pavement for large aircraft testing according to claim 8, characterized in that: The tack coat oil is cationic modified emulsified asphalt.

10. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 9, 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.

11. The construction method of asphalt replaceable pavement for large aircraft testing according to claim 10, characterized in that: In step S10, the sealant is a high-polyurethane or silicone sealant.

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