Paving cement concrete pavement device for airport pavement, paving device and method

Abstract

A kind of paving cement concrete pavement device for airport pavement, paving device and method, contain the concrete lower layer (1) for as the bottom layer of paving cement concrete pavement, the concrete upper layer (2) for as the top layer of paving cement concrete pavement, for as the dowel bar (3) of interrelated concrete lower layer (1), through concrete lower layer (1) and dowel bar (3), realize the foundation support to concrete upper layer (2), through concrete upper layer (2), realize the pavement optimization of paving cement concrete pavement, realize the layer of bare face part paving performance type, solve the technical problem that all one-time cement concrete pavement forming on natural soil base is formed, thereby restricting the service life of airport concrete pavement, so as to reduce the number of functional maintenance to pavement in service period.

Description

Technical Field

[0001] This invention relates to a device, paving apparatus and method for paving cement concrete pavement, and more particularly to a device, paving apparatus and method for paving cement concrete pavement for airport pavement. Background Technology

[0002] Airport pavement refers to one or more artificial structures paved with road-building materials on top of a natural soil base and subgrade. It serves as a runway for aircraft takeoff, landing, taxiing, maintenance, and parking, including runways, taxiways, passenger aprons, maintenance aprons, cargo aprons, and parking aprons. Therefore, the concrete pavement system for airports is a crucial structure. Currently, existing concrete pavement systems for airports still involve a one-time molding process on a natural soil base. However, the rate of functional degradation of the concrete pavement, such as surface wear, freeze-thaw spalling of the surface de-icing fluid, and edge / corner chipping, exceeds the rate of structural performance decline, thus limiting the service life of airport concrete pavements. Frequent functional maintenance is required during the service life of the pavement.

[0003] This invention, through its technical features of performance-based layered paving on exposed surfaces, effectively explores and studies the technical problem of the limited service life of airport concrete pavements caused by the one-time molding of cement concrete pavements on natural soil bases.

[0004] The statements herein provide only background information related to this invention and do not necessarily constitute prior art. Based on the technical disclosure provided by the applicant on May 28, 2023, which addresses practical technical problems encountered during the work process, and by searching for similar patent documents and existing technical problems, technical features, and technical effects in the background art, the technical solution of this invention is proposed. Summary of the Invention

[0005] The subject of this invention is a device for paving cement concrete pavement for airport pavements.

[0006] The subject of this invention is a cement concrete pavement paving device for airport pavements.

[0007] The subject of this invention is a method for paving cement concrete pavements for airport runways.

[0008] In order to overcome the above-mentioned technical shortcomings, the purpose of this invention is to provide a cement concrete pavement paving device, paving apparatus and method for airport pavements, thereby reducing the number of functional maintenance operations required during the service life of the pavement.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is: a concrete paving device for airport pavement, comprising a lower concrete layer for paving the bottom layer of the concrete pavement, a top concrete layer for paving the top layer of the concrete pavement, and force transmission bars for interconnecting the lower concrete layer.

[0010] By designing a concrete lower layer, a concrete upper layer, and dowel bars, the lower layer and dowel bars provide foundation support for the upper layer, while the upper layer optimizes the pavement surface of the cement concrete pavement. This allows for the paving of performance-oriented layers on exposed surfaces, solving the technical problem of limiting the service life of airport concrete pavements due to the one-time molding of cement concrete pavements on natural soil foundations. As a result, the number of functional maintenance operations required during the service life of the pavement is reduced.

[0011] This invention designs a method for connecting a lower concrete layer, a higher concrete layer, and dowel bars in a performance-oriented layering manner on an exposed surface.

[0012] This invention designs a method for connecting the concrete top layer, the concrete bottom layer, and the dowel bars in a way that optimizes the pavement of cement concrete pavement.

[0013] The technical effects of the above three solutions are: they enable the setting of functional covering layers, which are more suitable for the needs of the usage environment, and reduce the occurrence of concrete pavement surface wear, surface de-icing liquid freeze-thaw peeling, and edge and corner chipping.

[0014] The present invention comprises a concrete upper layer on a concrete lower layer, a dowel bar in the concrete lower layer, and the ratio of the thickness D2 of the concrete upper layer to the thickness D1 of the concrete lower layer is set to 1:5.2-6.2. The distance H between the center point of the dowel bar and the upper end face of the concrete lower layer is set to 118-122mm.

[0015] The technical effect of the above technical solution is that the basic technical solution of the present invention is formed by the lower concrete layer, the upper concrete layer, and the force transmission rod, which solves the technical problem of the present invention.

[0016] The present invention is designed such that the upper end face of the concrete lower layer is configured to be in contact with the concrete upper layer and the concrete lower layer is configured to be in a receiving connection with the force transmission rod. A corrugated trough is provided on the side face of the concrete lower layer and the concrete lower layer is a solidified body of ordinary pavement concrete. The corrugated trough is configured as an S-shaped trough.

[0017] The technical effects of the above solutions are: they provide support for the foundation of the paved cement concrete pavement, and through the corrugated trough, they enable the edges of the concrete surface layer to sink.

[0018] The present invention designs a high-performance concrete concretion in which the lower end face of the concrete top layer is configured to be in contact with the concrete bottom layer and the concrete top layer is configured to be distributed in a 1 / 4 shape.

[0019] The technical effect of the above solution is that it enables the adhesion and connection of the side surface of the lower concrete layer, thereby increasing the overall support strength of the upper concrete layer.

[0020] The present invention designs a force transmission bar that is embedded in the lower concrete layer and is made of round steel bars, and the force transmission bars are arranged at intervals along the center line of the cross section of the lower concrete layer.

[0021] The technical effect of the above solutions is to improve the overall performance of the concrete sublayer.

[0022] The present invention is designed such that the lower concrete layer and the dowel bar are distributed in a double-layer manner with the upper concrete layer.

[0023] This invention designs a cement concrete pavement paving device for airport pavements, comprising an outer steel formwork, an inner steel formwork, a support base, a hook, a slipform paver, a thrust block, and ground stakes. The support base and ground stakes are respectively set on the outer steel formwork, the inner steel formwork and the hook are respectively set on the support base, the slipform paver is set between the inner steel formwork, and the thrust block is set between the slipform paver and the inner steel formwork.

[0024] The technical effect of the above technical solution is that the basic technical solution of the present invention is formed by the outer steel formwork, inner steel formwork, support base, hook, slipform paver, thrust block and ground nail, which solves the technical problem of the present invention.

[0025] This invention designs an external steel formwork comprising a vertical plate portion I and a horizontal plate portion, with an opening I at the upper end of the vertical plate portion I, an opening II at the outer end of the horizontal plate portion, and the lower end portion of the vertical plate portion I being connected to the inner end portion of the horizontal plate portion. The opening I is connected to a support base, and the outer side portion of the vertical plate portion I is in contact with the support base. The opening II is connected to a ground nail, and the upper side portion of the horizontal plate portion is in contact with the ground nail. The vertical plate portion I and the horizontal plate portion are respectively configured as strip-shaped sheets, arranged in an L-shape, and the opening I and opening II are respectively configured as U-shaped openings.

[0026] The present invention designs an inner steel template comprising a vertical plate part II, a crank arm part, and a contact ball part. The horizontal end of the crank arm part is connected to the outer surface of the vertical plate part II, the vertical end of the crank arm part is connected to the contact ball part, and the middle part of the horizontal part of the crank arm part is connected to the support seat via a pin. The contact ball part is connected to the thrust block in contact. The vertical plate part II is a strip-shaped sheet with an S-shaped groove on its inner surface, the crank arm part is an L-shaped rod, and the contact ball part is a sphere.

[0027] The technical advantages of the two solutions above are: they enable the use of dual templates, allowing for the step-by-step molding of the lower and upper layers of concrete.

[0028] The present invention designs a support base that is configured as a Z-shaped block and has an opening III in the upper vertical part of the support base. The opening III is configured to be connected to the inner steel template by a pin, and the upper end face of the upper vertical part of the support base is configured to be connected to a hook. The upper vertical part of the support base is configured to be recessed and connected to the outer steel template, and the inner side face of the lower vertical part of the support base is configured to be contacted and connected to the outer steel template. The opening III is configured as a C-shaped opening.

[0029] The technical effect of the above technical solution is that it enables the detachable installation of the internal steel formwork.

[0030] The present invention designs a slipform paver as a concrete slipform paver and the slipform paver is arranged to be distributed corresponding to the inner steel formwork, and the side part of the slipform paver is arranged to be connected to the thrust block.

[0031] The technical effect of the above solution is that it enables the paving and shaping of the lower and upper concrete layers.

[0032] The present invention is designed such that the thrust block is configured as a strip pile body and the inner end face of the thrust block is configured to be connected to the slipform paver, and the outer end face of the thrust block is configured to be connected to the inner steel formwork in contact.

[0033] The technical effect of the above technical solution is that it enables the internal steel formwork to swing.

[0034] The present invention designs a hook as an assembly having a ring and a vertical rod, wherein the end of the vertical rod of the hook is configured to be connected to a support base.

[0035] The technical effect of the above solution is that it enables the hoisting of internal steel formwork.

[0036] The present invention designs a ground nail as an L-shaped rod, with the vertical part of the ground nail being embedded and connected to the outer steel template, and the horizontal part of the ground nail being contacted and connected to the outer steel template.

[0037] The technical effect of the above solution is that it enables the fixing of external steel formwork.

[0038] The present invention designs a slipform paver, an outer steel formwork and ground nails, an inner steel formwork, a support base and a thrust block, which are arranged in a manner similar to an internal formwork, and the slipform paver, outer steel formwork, ground nails, inner steel formwork, support base and thrust block and hooks are arranged in a manner similar to having a hanging part.

[0039] The present invention is designed such that a support base and a hook are configured to form a set of embedded components, multiple sets of embedded components are arranged between the inner steel template and the outer steel template, ground nails are arranged at intervals along the center line of the horizontal plate, and the opening body III is connected to the crank arm.

[0040] This invention designs a method for paving cement concrete pavement for airport runways. The steps are as follows: ordinary runway concrete raw materials for the lower layer are mixed to obtain ordinary runway concrete; high-performance concrete raw materials for the upper layer are mixed to obtain high-performance concrete; an outer steel formwork is placed on the edge of the paved cement concrete pavement; the vertical part of the ground stake is inserted into the opening II; the ground stake is hammered, so that the horizontal part of the ground stake acts on the upper side of the horizontal plate. Connect the ring of the hook to the hook, and use a crane to lift the inner steel formwork. Install the upper vertical part of the support seat into the opening I, connecting the inner side of the lower vertical part of the support seat to the outer side of the vertical plate I. Place the slipform paver between the two vertical plate IIs, and install the dowel bar between the two vertical plate IIs, ensuring that the distance H between the center point of the dowel bar and the upper end face of the lower concrete layer is 118-122mm. Place the ordinary pavement concrete of the lower concrete layer into the slipform paver. Using the slipform paver, the concrete is spread between the two vertical plate IIs. The lower layer of concrete is laid between sections II. A corrugated groove is formed on the side of the lower layer of concrete through vertical plate section II. When the contact ball contacts the outer end face of the thrust block, the crank arm swings on the pin located in the opening section III, causing vertical plate section II to move inward and upward, compressing and squeezing the lower layer of concrete between vertical plate sections II. The lower layer of concrete is then vibrated to obtain the final lower layer. Before the lower layer of concrete begins to set, the ring of the hook is connected to the hook, and the inner steel formwork is lifted by a crane. The upper vertical section of the support base is then... Remove from opening I, separate the inner side of the lower vertical part of the support from the outer side of vertical plate I, remove vertical plate II from vertical plate I, place the slipform paver on the lower concrete layer, put the high-performance concrete for the upper concrete layer into the slipform paver, and pave the upper concrete layer on the lower concrete layer using the slipform paver. After the upper concrete layer is paved, pull the ground stakes out from the natural soil base of the paved cement concrete pavement of the airport runway, and remove the outer steel formwork from the edge of the paved cement concrete pavement of the airport runway.

[0041] This invention designs a high-performance concrete for the concrete surface layer, which has a compressive strength greater than 60 MPa, a flexural strength greater than 7 MPa, a water-cement ratio not greater than 0.35, a freeze-thaw resistance grade greater than F500, and a permeability grade not less than P12.

[0042] This invention comprises the following operational steps:

[0043] S1. Equipment preparation: 2 HZS180 mixing plants, 2 Wirtgen SP500 slipform pavers, and other machinery and equipment.

[0044] S2, Formwork erection: Erect 32cm high formwork for the lower layer of concrete construction. The formwork is made of steel and has a tongue-and-groove joint. It is secured with steel stakes. Any gaps at the bottom of the formwork are sealed with cement mortar and covered with tar paper folded at 90° to prevent grout leakage during concrete pouring.

[0045] S3, ordinary roadway concrete mixing, uses batching plant #1 for ordinary roadway concrete mixing. An intermittent forced twin-shaft mixing tower is used for centralized mixing of cement concrete. Operators must strictly control the feeding speed of various material silos, the accuracy of metering, and the mixing time according to the instructions.

[0046] S4. Concrete transportation: Dump trucks will be used to transport the mixed concrete to the construction site. Good condition, high-capacity, and leak-proof dump trucks must be selected for concrete transportation. The unloading drop of the dump trucks must not exceed 1.5m. The transportation and paving time of the mixture must be strictly controlled according to the construction temperature.

[0047] S5, Concrete base layer paving: The 32cm thick base layer is paved using a #1 Wirtgen SP500 slipform paver. A formwork construction method is employed. Cement concrete is poured in front of the paver, and an excavator performs initial placement to ensure even distribution of the mix in front of the paver. As the paver advances, a auger or spreading plow evenly distributes the concrete in front of the vibratory slab, which controls the amount of concrete entering the vibratory chamber. The loose paving coefficient should be determined through trial paving based on the slump. The construction distance between the spreading paver and the slipform paver should be controlled at 5–10m.

[0048] Concrete vibration: The vibrator is inserted into the concrete in an "L" shape. The rotation of the eccentric block of the vibrator generates periodic vibration waves, which makes the concrete dense.

[0049] Concrete extrusion molding: As the paver moves forward, the vibrated and liquefied concrete enters the extrusion plate. Through extrusion, the concrete fills the entire molding cavity, further enhancing the pavement's compactness. The extrusion plate's elevation angle is adjusted according to the longitudinal slope of the paving section to ensure the concrete receives sufficient extrusion pressure.

[0050] Dowel bar insertion: The slipform paver is equipped with a DBI device for automatic dowel bar insertion. The dowel bars are positioned at a thickness of -12cm.

[0051] S6, High-Performance Concrete (HPC) mixing, uses batching plant #2. Other key points are the same as S3. High-performance concrete has a 28-day compressive strength greater than 60 MPa, a flexural strength greater than 7 MPa, a water-cement ratio not greater than 0.35, a frost resistance grade greater than F500, and a permeability grade not less than P12.

[0052] S7. Concrete transportation: Dump trucks will be used to transport the mixed concrete to the construction site. Other key points are the same as in S4.

[0053] S8, Concrete surface layer paving: The 8cm thick surface layer is paved using a #2 Wirtgen SP500 slipform paver, employing a drag-formwork construction method (no formwork support). The surface layer must be paved before the initial setting of the underlying cement. Other key points are the same as in S5.

[0054] S9, surface preparation, the smoothing and repair of the pavement surface is completed by the smoothing beam and the super smoothing tool together, which can eliminate local defects such as surface bubbles and aggregate drag. After the slipform paver is used to make the surface, manual smoothing is required.

[0055] The technical effect of the above three technical solutions is that they enable the use of slipform pavers to perform two paving operations for laying cement concrete pavements.

[0056] In this technical solution, the concrete lower layer, concrete upper layer and dowel bars of the exposed surface paving performance layer are important technical features. In the technical field of paving cement concrete pavement device, paving device and method for airport pavement, it has novelty, inventiveness and practicality. The terminology in this technical solution can be explained and understood by patent literature in this technical field. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of the present 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of a cement concrete pavement paving device for airport pavements according to the present invention.

[0059] Figure 2 This is a schematic diagram of a cement concrete pavement paving device for airport pavement according to the present invention.

[0060] Concrete lower layer-1, concrete upper layer-2, dowel bar-3, corrugated trough-11, outer steel formwork-4, inner steel formwork-5, support base-6, hook-7, slipform paver-8, thrust block-9, ground nail-91, vertical plate I-41, horizontal plate I-42, opening body I-43, opening body II-44, vertical plate II-51, crank arm-52, contact ball-53, opening body III-61. Detailed Implementation

[0061] According to the examination guidelines, terms such as “having,” “comprising,” and “including” used in this invention should be understood to mean without dispensing the presence or addition of one or more other elements or combinations thereof.

[0062] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0063] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. In addition, unless otherwise specified, the equipment and materials used in the following embodiments are commercially available. If the processing conditions are not explicitly stated, please refer to the product manual or follow the conventional methods in the field.

[0065] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] A device for paving cement concrete pavement for airport pavements. Figure 1This is the first embodiment of the present invention. The embodiment is described in detail with reference to the accompanying drawings. It includes a lower concrete layer 1, a higher concrete layer 2, and a dowel bar 3. The upper concrete layer 2 is disposed on the lower concrete layer 1. The dowel bar 3 is disposed in the lower concrete layer 1. The ratio of the thickness D2 of the upper concrete layer 2 to the thickness D1 of the lower concrete layer 1 is set to 1:5.2-6.2. The distance H between the center point of the dowel bar 3 and the upper end face of the lower concrete layer 1 is set to 118-122 mm.

[0067] In this embodiment, the upper end face of the concrete lower layer 1 is configured to be in contact with the concrete upper layer 2 and the concrete lower layer 1 is configured to be in accommodating connection with the force transmission rod 3. A corrugated trough 11 is provided on the side face of the concrete lower layer 1 and the concrete lower layer 1 is configured as a solidified body of ordinary track concrete. The corrugated trough 11 is configured as an S-shaped trough.

[0068] The lower concrete layer 1 forms a support connection point for the upper concrete layer 2 and the dowel bar 3. The lower concrete layer 1 connects to the upper concrete layer 2 and the dowel bar 3. The corrugated trough 11 enhances the stability of the upper concrete layer 2. Its technical purpose is to serve as the main support component of the cement concrete pavement device.

[0069] In this embodiment, the lower end face of the concrete top layer 2 is configured to be in contact with the concrete bottom layer 1, and the concrete top layer 2 is configured as a solidified high-performance concrete in a 1 / 4" shape.

[0070] The concrete top layer 2 forms a support connection point to the concrete bottom layer 1. The connection between the concrete top layer 2 and the concrete bottom layer 1 is achieved through the concrete top layer 2. Its technical purpose is to serve as a functional component of the cement concrete pavement paving device.

[0071] In this embodiment, the force transmission rod 3 is configured to be embedded and connected to the lower concrete layer 1, and the force transmission rod 3 is configured to be a round steel bar. The force transmission rod 3 is configured to be arranged at intervals along the center line of the cross section of the lower concrete layer 1.

[0072] The force transmission rod 3 forms a support connection point for the lower concrete layer 1. The force transmission rod 3 realizes the connection with the lower concrete layer 1. Its technical purpose is to serve as a component to prevent uneven settlement of the lower concrete layer 1.

[0073] In this embodiment, the lower concrete layer 1 and the force transmission rod 3 are arranged in a double-layer configuration with the upper concrete layer 2.

[0074] In one of the supporting examples of the first embodiment of the present invention, the ratio of the thickness D2 of the concrete upper layer 2 to the thickness D1 of the concrete lower layer 1 is set to 1:5.2, and the distance H between the center point of the force transmission rod 3 and the upper end face of the concrete lower layer 1 is set to 118mm.

[0075] In a supporting example of the first embodiment of the present invention, the ratio of the thickness D2 of the concrete upper layer 2 to the thickness D1 of the concrete lower layer 1 is set to 1:6.2, and the distance H between the center point of the force transmission rod 3 and the upper end face of the concrete lower layer 1 is set to 122mm.

[0076] In the third supporting example of the first embodiment of the present invention, the ratio of the thickness D2 of the concrete upper layer 2 to the thickness D1 of the concrete lower layer 1 is set to 1:5.7, and the distance H between the center point of the force transmission rod 3 and the upper end face of the concrete lower layer 1 is set to 120mm.

[0077] A cement concrete pavement paving device for airport pavements. Figure 2 This is the first embodiment of the present invention. The embodiment is described in detail with reference to the accompanying drawings. It includes an outer steel formwork 4, an inner steel formwork 5, a support base 6, a hook 7, a slipform paver 8, a thrust block 9, and ground spikes 91. The support base 6 and ground spikes 91 are respectively provided on the outer steel formwork 4. The inner steel formwork 5 and the hook 7 are respectively provided on the support base 6. The slipform paver 8 is provided between the inner steel formwork 5. The thrust block 9 is provided between the slipform paver 8 and the inner steel formwork 5.

[0078] In this embodiment, the outer steel template 4 is configured to include a vertical plate portion I 41 and a horizontal plate portion 42, with an opening I 43 at the upper end of the vertical plate portion I 41, an opening II 44 at the outer end of the horizontal plate portion 42, and the lower end portion of the vertical plate portion I 41 being connected to the inner end portion of the horizontal plate portion 42. The opening I 43 is connected to the support base 6, and the outer side portion of the vertical plate portion I 41 is in contact with the support base 6. The opening II 44 is connected to the ground nail 91, and the upper side portion of the horizontal plate portion 42 is in contact with the ground nail 91. The vertical plate portion I 41 and the horizontal plate portion 42 are respectively configured as strip-shaped sheets, arranged in an L-shape, and the opening I 43 and the opening II 44 are respectively configured as U-shaped openings.

[0079] The outer steel formwork 4 forms a support connection point for the support base 6 and the ground nail 91. The connection with the support base 6 is achieved by the guide plate part I 41 and the opening body I 43, and the connection with the ground nail 91 is achieved by the horizontal plate part 42 and the opening body II 44. Its technical purpose is to be used as one of the formwork components for shaping the lower concrete layer 1.

[0080] In this embodiment, the inner steel template 5 is configured to include a vertical plate portion II 51, a crank arm portion 52, and a contact ball portion 53. The horizontal end of the crank arm portion 52 is configured to be connected to the outer surface of the vertical plate portion II 51, the vertical end of the crank arm portion 52 is configured to be connected to the contact ball portion 53, and the middle part of the horizontal portion of the crank arm portion 52 is configured to be connected to the support seat 6 via a pin. The contact ball portion 53 is configured to be connected to the thrust block 9 in contact. The vertical plate portion II 51 is configured to be a strip-shaped sheet with an S-shaped groove on its inner surface, the crank arm portion 52 is configured to be an L-shaped rod, and the contact ball portion 53 is configured to be a sphere.

[0081] The inner steel template 5 forms a support connection point for the support base 6 and the thrust block 9. The crank arm 52 connects to the support base 6, the ball 53 connects to the thrust block 9, and the vertical plate 51 shapes the corrugated trough 11. Its technical purpose is to serve as the second template component for shaping the lower concrete layer 1.

[0082] In this embodiment, the support base 6 is configured as a Z-shaped block and an opening III 61 is provided on the upper vertical part of the support base 6. The opening III 61 is configured to be connected to the inner steel template 5 by a pin, and the upper end face of the upper vertical part of the support base 6 is configured to be connected to the hook 7. The upper vertical part of the support base 6 is configured to be recessed and connected to the outer steel template 4, and the inner side face of the lower vertical part of the support base 6 is configured to be contacted and connected to the outer steel template 4. The opening III 61 is configured as a U-shaped opening.

[0083] The support base 6 forms a support connection point for the outer steel formwork 4, the inner steel formwork 5, and the hook 7. The opening body Ⅲ61 connects to the inner steel formwork 5, the support base 6 connects to the outer steel formwork 4, and the hook 7. Its technical purpose is to serve as a support carrier for the inner steel formwork 5.

[0084] In this embodiment, the slipform paver 8 is configured as a concrete slipform paver and is distributed corresponding to the inner steel formwork 5. The side of the slipform paver 8 is configured to be connected to the thrust block 9.

[0085] The slipform paver 8 forms a support connection point for the inner steel formwork 5 and the thrust block 9. The slipform paver 8 realizes the connection with the inner steel formwork 5 and the connection with the thrust block 9. Its technical purpose is to be used as a component for shaping the lower concrete layer 1 and the upper concrete layer 2.

[0086] In this embodiment, the thrust block 9 is configured as a strip pile body and the inner end face of the thrust block 9 is configured to be connected to the slipform paver 8, while the outer end face of the thrust block 9 is configured to be connected to the inner steel formwork 5 in contact.

[0087] The thrust block 9 forms a support connection point between the inner steel formwork 5 and the slipform paver 8. The thrust block 9 realizes the connection with the inner steel formwork 5 and the slipform paver 8. Its technical purpose is to serve as a component that pushes the inner steel formwork 5 to swing on the outer steel formwork 4.

[0088] In this embodiment, the hook 7 is configured as an assembly having a ring and a vertical rod, and the end of the vertical rod of the hook 7 is configured to be connected to the support base 6.

[0089] The hook 7 forms a support connection point for the support base 6, and the hook 7 realizes the connection with the support base 6. Its technical purpose is to serve as a component for connection with the hook.

[0090] In this embodiment, the ground nail 91 is configured as an L-shaped rod, and the vertical part of the ground nail 91 is configured to be embedded and connected to the outer steel template 4, while the horizontal part of the ground nail 91 is configured to be connected to the outer steel template 4 in contact.

[0091] The ground nail 91 forms a support connection point for the outer steel formwork 4. The ground nail 91 enables the connection with the outer steel formwork 4. Its technical purpose is to serve as a component for fixing the outer steel formwork 4.

[0092] In this embodiment, the slipform paver 8, outer steel formwork 4, and ground spikes 91 are arranged with the inner steel formwork 5, support base 6, and thrust block 9 in a manner similar to built-in templates. The slipform paver 8, outer steel formwork 4, ground spikes 91, inner steel formwork 5, support base 6, and thrust block 9 are arranged with the hook 7 in a manner similar to having a hook-on part. One support base 6 and one hook 7 are arranged to form a set of embedded parts. Multiple sets of embedded parts are arranged between the inner steel formwork 5 and the outer steel formwork 4. The ground spikes 91 are arranged at intervals along the center line of the horizontal plate part 42. The opening body Ⅲ 61 is connected to the crank arm part 52.

[0093] The present invention will be further described below with reference to embodiments. These embodiments are intended to illustrate the present invention and not to further limit the present invention.

[0094] A method for paving cement concrete pavement for airport pavement, one of the first embodiments of the present invention, comprises the following steps: mixing the raw materials of ordinary pavement concrete for the lower concrete layer 1 to obtain ordinary pavement concrete for the lower concrete layer 1; mixing the raw materials of high-performance concrete for the upper concrete layer 2 to obtain high-performance concrete for the upper concrete layer 2; placing the outer steel formwork 4 on the edge of the paved cement concrete pavement; inserting the vertical part of the ground nail 91 into the opening body II 44; hammering the ground nail 91 so that the horizontal part of the ground nail 91 acts on the upper side of the horizontal plate part 42; connecting the ring of the hook 7 to the hook; lifting the inner steel formwork 5 using a crane; installing the upper vertical part of the support seat 6 into the opening body I 43, so that the inner side of the lower vertical part of the support seat 6 is flush with the vertical plate part I 41. The outer surface of the concrete layer 1 is connected, and the slipform paver 8 is placed between the two vertical plate sections II 51. The dowel bar 3 is installed between the two vertical plate sections II 51, so that the distance H between the center point of the dowel bar 3 and the upper end face of the concrete lower layer 1 is 118-122mm. The ordinary pavement concrete of the concrete lower layer 1 is placed into the slipform paver 8. The slipform paver 8 spreads the concrete lower layer 1 between the two vertical plate sections II 51. The vertical plate sections II 51 form a corrugated groove 11 on the side surface of the concrete lower layer 1. When the contact ball 53 contacts the outer end face of the thrust block 9, the crank arm 52 swings on the pin located in the opening body III 61, causing the vertical plate sections II 51 to move inward and upward, compressing and squeezing the concrete lower layer 1 located between the vertical plate sections II 51. The concrete lower layer 1 is then vibrated.

[0095] Before the initial setting of the concrete lower layer 1, the ring of the hook 7 is connected to the hook. The inner steel formwork 5 is lifted by the crane. The upper vertical part of the support seat 6 is removed from the opening body I 43, and the inner side of the lower vertical part of the support seat 6 is separated from the outer side of the vertical plate part I 41. The vertical plate part II 51 is removed from the vertical plate part I 41. The slipform paver 8 is placed on the concrete lower layer 1. The high-performance concrete of the concrete upper layer 2 is placed in the slipform paver 8. The concrete upper layer 2 is laid on the concrete lower layer 1 by the slipform paver 8. After the concrete upper layer 2 is laid, the ground nail 91 is pulled out from the natural soil base of the cement concrete pavement of the airport runway. The outer steel formwork 4 is removed from the edge of the cement concrete pavement of the airport runway.

[0096] In this embodiment, the high-performance concrete of the concrete top layer 2 is set as high-performance concrete with a compressive strength greater than 60MPa, a flexural strength greater than 7MPa, a water-cement ratio not greater than 0.35, a freeze-thaw resistance grade greater than F500, and a permeability grade not less than P12.

[0097] One of the supporting examples of the first embodiment of the present invention is to make the distance H between the center point of the force transmission rod 3 and the upper end face of the concrete lower layer 1 118mm.

[0098] The second supporting example of one of the first embodiments of the present invention is to make the distance H between the center point of the force transmission rod 3 and the upper end face of the concrete lower layer 1 122mm.

[0099] The third supporting example of one of the first embodiments of the present invention is to make the distance H between the center point of the force transmission rod 3 and the upper end face of the concrete lower layer 1 120mm.

[0100] A method for paving cement concrete pavement for airport pavements, the second of the first embodiments of the present invention.

[0101] The following steps are included:

[0102] S1. Equipment preparation: 2 HZS180 mixing plants, 2 Wirtgen SP500 slipform pavers, and other machinery and equipment.

[0103] S2, Formwork erection: Erect 32cm high formwork for the lower layer of concrete construction. The formwork is made of steel and has a tongue-and-groove joint. It is secured with steel stakes. Any gaps at the bottom of the formwork are sealed with cement mortar and covered with tar paper folded at 90° to prevent grout leakage during concrete pouring.

[0104] S3, ordinary roadway concrete mixing, uses batching plant #1 for ordinary roadway concrete mixing. An intermittent forced twin-shaft mixing tower is used for centralized mixing of cement concrete. Operators must strictly control the feeding speed of various material silos, the accuracy of metering, and the mixing time according to the instructions.

[0105] S4. Concrete transportation: Dump trucks will be used to transport the mixed concrete to the construction site. Good condition, high-capacity, and leak-proof dump trucks must be selected for concrete transportation. The unloading drop of the dump trucks must not exceed 1.5m. The transportation and paving time of the mixture must be strictly controlled according to the construction temperature.

[0106] S5, Concrete base layer paving: The 32cm thick base layer is paved using a #1 Wirtgen SP500 slipform paver. A formwork construction method is employed. Cement concrete is poured in front of the paver, and an excavator performs initial placement to ensure even distribution of the mix in front of the paver. As the paver advances, a auger or spreading plow evenly distributes the concrete in front of the vibratory slab, which controls the amount of concrete entering the vibratory chamber. The loose paving coefficient should be determined through trial paving based on the slump. The construction distance between the spreading paver and the slipform paver should be controlled at 5–10m.

[0107] Concrete vibration: The vibrator is inserted into the concrete in an "L" shape. The rotation of the eccentric block of the vibrator generates periodic vibration waves, which makes the concrete dense.

[0108] Concrete extrusion molding: As the paver moves forward, the vibrated and liquefied concrete enters the extrusion plate. Through extrusion, the concrete fills the entire molding cavity, further enhancing the pavement's compactness. The extrusion plate's elevation angle is adjusted according to the longitudinal slope of the paving section to ensure the concrete receives sufficient extrusion pressure.

[0109] Dowel bar insertion: The slipform paver is equipped with a DBI device for automatic dowel bar insertion. The dowel bars are positioned at a thickness of -12cm.

[0110] S6, High-Performance Concrete (HPC) mixing, uses batching plant #2. Other key points are the same as S3. High-performance concrete has a 28-day compressive strength greater than 60 MPa, a flexural strength greater than 7 MPa, a water-cement ratio not greater than 0.35, a frost resistance grade greater than F500, and a permeability grade not less than P12.

[0111] S7. Concrete transportation: Dump trucks will be used to transport the mixed concrete to the construction site. Other key points are the same as in S4.

[0112] S8, Concrete surface layer paving: The 8cm thick surface layer is paved using a #2 Wirtgen SP500 slipform paver, employing a drag-formwork construction method (no formwork support). The surface layer must be paved before the initial setting of the underlying cement. Other key points are the same as in S5.

[0113] S9, surface preparation, the smoothing and repair of the pavement surface is completed by the smoothing beam and the super smoothing tool together, which can eliminate local defects such as surface bubbles and aggregate drag. After the slipform paver is used to make the surface, manual smoothing is required.

[0114] In verifying this invention, the inventors abandoned the existing technical features of one-time cement concrete pavement forming on natural soil, which restricts the service life of airport concrete pavement. They first proposed the technical feature of laying performance-type layers on exposed surfaces, resulting in the first unexpected technical effect: the traffic performance of the laid cement concrete pavement was optimized through the concrete top layer 2. The second unexpected technical effect: the corrugated trough 11 increased the downward turning amount of the concrete top layer 2, improving the connection strength with the concrete bottom layer 1. The third unexpected technical effect: the thickness ratio of the concrete bottom layer 1 and the concrete top layer 2 was set to meet the paving performance of the high-performance concrete of the concrete top layer 2, improving the flatness of the concrete top layer 2. The fourth unexpected technical effect: the layered removal of the concrete bottom layer 1 and the concrete top layer 2 was realized, optimizing the re-paving operation. The fifth unexpected technical effect: the forming accuracy of the concrete bottom layer 1 and the concrete top layer 2 was ensured through the outer steel formwork 4 and the inner steel formwork 5.

[0115] In a second embodiment of the present invention, the lower concrete layer 1, the upper concrete layer 2, and the dowel bar 3 are interconnected in a manner that allows for the laying of performance-type layers on exposed surfaces.

[0116] In this embodiment, the concrete upper layer 2, the concrete lower layer 1, and the dowel bar 3 are interconnected in a way that optimizes the pavement of the cement concrete pavement.

[0117] The second embodiment of the present invention is based on the first embodiment.

[0118] This invention has the following characteristics:

[0119] 1. Due to the design of concrete lower layer 1, concrete upper layer 2 and dowel bars 3, the concrete lower layer 1 and dowel bars 3 are used to support the foundation of concrete upper layer 2. Concrete upper layer 2 is used to optimize the pavement of cement concrete pavement. It realizes the paving of performance-type layers on exposed surfaces, and solves the technical problem that the one-time molding of cement concrete pavement on natural soil base restricts the service life of airport concrete pavement. Therefore, it reduces the number of functional maintenance of pavement during the service life.

[0120] 2. Due to the design of external steel formwork 4, internal steel formwork 5, support base 6, slipform paver 8, thrust block 9 and ground nail 91, it is possible to carry out formwork construction for the lower concrete layer 1 and drag formwork construction for the upper concrete layer 2.

[0121] 3. Due to the design of the hook 7, the inner steel formwork 5 can be hoisted.

[0122] 4. Because the design limits the numerical range of the structural shape, the numerical range is a technical feature in the technical solution of this invention, and is not a technical feature obtained by formula calculation or a limited number of experiments. The experiment shows that the technical feature of the numerical range has achieved very good technical effect.

[0123] 5. Due to the design of the technical features of this invention, and the combined effect of the individual and collective technical features, experiments have shown that the performance indicators of this invention are at least 1.7 times that of existing performance indicators, and the invention has been evaluated to have good market value.

[0124] Other technical features that connect the concrete lower layer 1, concrete upper layer 2, and dowel bar 3 to the performance-type layer of the paving on the exposed surface are also embodiments of the present invention. Furthermore, the technical features of the above embodiments can be combined in any way. In order to meet the requirements of the Patent Law, the Patent Implementation Regulations, and the Examination Guidelines, all possible combinations of the technical features in the above embodiments will not be described.

[0125] The above embodiments are merely one implementation of the cement concrete pavement paving device, paving apparatus and method for airport pavement provided by the present invention. Other modifications of the solution provided by the present invention, additions or reductions of components or steps, or application of the present invention to other technical fields similar to the present invention, all fall within the protection scope of the present invention.

Claims

1. A cement concrete pavement paving device for airport pavements, characterized in that: It includes an outer steel formwork (4), an inner steel formwork (5), a support base (6), a hook (7), a slipform paver (8), a thrust block (9), and ground spikes (91). The outer steel formwork (4) is provided with a support base (6) and a ground spike (91). The inner steel formwork (5) and the hook (7) are provided on the support base (6). The slipform paver (8) is provided between the inner steel formwork (5). The thrust block (9) is provided between the slipform paver (8) and the inner steel formwork (5). The outer steel formwork (4) is configured to include a vertical plate part I (41) and a horizontal plate part (42), and an opening body I (43) is provided at the upper end of the vertical plate part I (41), and an opening body II (44) is provided at the outer end of the horizontal plate part (42). The lower end face of the vertical plate part I (41) is configured to be connected to the inner end face of the horizontal plate part (42). The opening body I (43) is configured to be connected to the support base (6), and the outer side of the vertical plate part I (41) is also configured to be connected to the support base (6). The part is configured to be connected to the support base (6) in contact, the opening body II (44) is configured to be connected to the ground nail (91), and the upper side of the horizontal plate part (42) is configured to be connected to the ground nail (91) in contact. The vertical plate part I (41) and the horizontal plate part (42) are respectively configured as strip-shaped pieces. The vertical plate part I (41) and the horizontal plate part (42) are configured to be distributed in an L-shape, and the opening body I (43) and the opening body II (44) are respectively configured as U-shaped openings. The inner steel formwork (5) is configured to include a vertical plate part II (51), a crank arm part (52), and a ball part (53). The horizontal end of the crank arm part (52) is connected to the outer surface of the vertical plate part II (51), the vertical end of the crank arm part (52) is connected to the ball part (53), and the middle part of the horizontal part of the crank arm part (52) is connected to the support base (6) via a pin. The ball part (53) is connected to the thrust block (9) in contact. The vertical plate part II (51) is a strip-shaped sheet with an S-shaped groove on its inner surface, the crank arm part (52) is an L-shaped rod, and the ball part (53) is a sphere. The support base (6) is configured as a Z-shaped block and has an opening III (61) on its upper vertical part. The opening III (61) is configured to be connected to the inner steel template (5) via a pin. The upper end face of the upper vertical part of the support base (6) is configured to be connected to the hook (7). The upper vertical part of the support base (6) is configured to be recessed into the outer steel template (4). The inner side face of the lower vertical part of the support base (6) is configured to be in contact with the outer steel template (4). The opening III (61) is configured as a U-shaped opening. The slipform paver (8) is configured as a concrete slipform paver and is distributed correspondingly to the inner steel formwork (5). The side of the slipform paver (8) is configured to be connected to the thrust block (9). The thrust block (9) is configured as a strip pile body, and the inner end face of the thrust block (9) is configured to connect with the slipform paver (8), while the outer end face of the thrust block (9) is configured to connect with the inner steel formwork (5) in contact. The hook (7) is configured as an assembly with a ring and a vertical rod, and the end of the vertical rod of the hook (7) is configured to be connected to the support base (6). The ground nail (91) is set as an L-shaped rod and the vertical part of the ground nail (91) is set to be embedded and connected with the outer steel template (4), and the horizontal part of the ground nail (91) is set to be connected in contact with the outer steel template (4).

2. The cement concrete pavement paving device for airport pavements according to claim 1, characterized in that: A support base (6) and a hook (7) are configured to form a set of embedded components. Multiple sets of embedded components are set between the inner steel template (5) and the outer steel template (4). Ground nails (91) are arranged at intervals along the center line of the horizontal plate (42). Opening body III (61) is connected to the crank arm (52).

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