Coarse aggregate-containing ultra-high performance concrete, bridge deck pavement layer and pavement method

Abstract

The invention relates to ultra-high performance concrete containing coarse aggregate, a bridge deck pavement layer and a pavement method, and the ultra-high performance concrete containing the coarse aggregate comprises the following components in parts by weight: 500-600 parts of cement, 100-110 parts of microbeads, 40-50 parts of silica fume, 680-750 parts of river sand, 600-700 parts of basalt macadam, 140-160 parts of water, 15-20 parts of a superplasticizer and 40-50 parts of steel fiber. According to the invention, the compressive strength and tensile strength of the concrete can be improved, the bridge deck pavement cost is reduced, and the service life of the bridge deck pavement layer is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of steel bridge deck pavement, and in particular to an ultra-high performance concrete containing coarse aggregate, a bridge deck pavement layer and a paving method. Background Art

[0002] Ultra-high performance concrete (UHPC) has excellent mechanical properties and durability and has been used in many engineering projects in recent years. However, UHPC has significant self-leveling properties and poor slope fixation ability, so it cannot be used in bridge deck paving projects with large slopes. In addition, the high cost of UHPC materials has become a significant obstacle to its large-scale promotion and application.

[0003] In addition, in order to improve the driving safety of circular curve bridges and offset the centrifugal force generated during driving, the driving lane is usually designed as a one-way transverse slope structure with high outside and low inside of the curve, that is, the superelevation design of the bridge. The methods to achieve this design mainly include structural slope change and cushion slope change. Among them, the structural slope change is to achieve superelevation structural slope change by directly adjusting the transverse slope of the top plate of the steel box girder, but this method increases the difficulty and cost of steel structure processing, and greatly increases the overall construction cost of circular curve bridges; cushion slope change is to use concrete as the cushion layer, and achieve superelevation structure by adjusting the slope or shape of the cushion layer. It has the advantages of strong adaptability and low cost. However, ordinary concrete cushion layers have problems such as poor stress performance and insufficient durability, which are difficult to meet the high requirements of modern bridge engineering for material performance and service life. Summary of the invention

[0004] The present application provides an ultra-high performance concrete containing coarse aggregate, a bridge deck pavement layer and a paving method, which can solve the technical problems of poor stress-bearing performance and insufficient durability of ordinary concrete cushion layers existing in the prior art.

[0005] In a first aspect, an embodiment of the present application provides an ultra-high performance concrete containing coarse aggregate, wherein the ultra-high performance concrete containing coarse aggregate comprises, by weight, 500-600 parts of cement, 100-110 parts of microspheres, 40-50 parts of silica fume, 680-750 parts of river sand, 600-700 parts of basalt gravel, 140-160 parts of water, 15-20 parts of high-efficiency water reducing agent, and 40-50 parts of steel fiber.

[0006] In the second aspect, the embodiment of the present application provides a bridge deck pavement layer based on the above-mentioned ultra-high performance concrete containing coarse aggregate, including: a main body, a single-layer steel mesh, a plurality of shear nails of different lengths, and a double-layer steel mesh. The main body is cast from ultra-high performance concrete containing coarse aggregate, and its top surface is an inclined surface in the transverse direction of the bridge. The main body is divided into a first part, a second part, and a third part in the transverse direction of the bridge, and the first part is located at the lower end of the inclined surface; the single-layer steel mesh is buried in the first part; a plurality of shear nails of different lengths are buried in the second part and the third part; the double-layer steel mesh is buried in the third part; wherein the length of the plurality of shear nails and the elevation of the steel bars of the double-layer steel mesh increase as the inclined surface increases.

[0007] In combination with the second aspect, in one implementation, the single-layer steel mesh and the shear nails are both pre-embedded by welding, and the double-layer steel mesh is pre-embedded by binding.

[0008] In combination with the second aspect, in one embodiment, the double-layer steel mesh includes an upper steel mesh and a lower steel mesh, the upper steel mesh adjusts the steel bar elevation through elevation control bars, and the lower steel mesh controls the steel bar elevation through pad bars.

[0009] In combination with the second aspect, in one embodiment, the elevation control bars are supported below the upper steel mesh and are arranged at equal intervals along the longitudinal direction of the bridge; the pad bars are supported below the lower steel mesh and are arranged at equal intervals in a plum blossom shape.

[0010] On the third aspect, an embodiment of the present application provides a paving method for a bridge deck pavement layer based on the above-mentioned ultra-high performance concrete containing coarse aggregate, the steps comprising: based on the target elevation range of the slope, dividing the bridge deck into a first area, a second area and a third area in three parts along the transverse direction of the bridge; pre-embedding a single-layer steel mesh in the first area, pre-embedding a number of shear nails of different lengths in the second area and the third area, and tying a double-layer steel mesh in the third area, and the length of the several shear nails and the elevation of the steel bars of the double-layer steel mesh increase with the increase of the slope; uniformly pouring the ultra-high performance concrete containing coarse aggregate in each area until the elevation of the slope reaches the target elevation range to obtain a bridge deck pavement layer containing ultra-high performance concrete containing coarse aggregate.

[0011] In combination with the third aspect, in one embodiment, the target elevation range includes three continuous elevation ranges, and the first part, the second part, and the third part of the main body each correspond to an elevation range, the elevation range corresponding to the first part is smaller than the elevation range corresponding to the second part, and the elevation range corresponding to the second part is smaller than the elevation range corresponding to the third part.

[0012] In combination with the third aspect, in one embodiment, ultra-high performance concrete containing coarse aggregate is uniformly poured in each area until the elevation of the inclined surface reaches the target elevation range to obtain a bridge deck pavement layer of ultra-high performance concrete containing coarse aggregate, and the steps include: erecting a steel track composed of plain round steel bars and horse stools, and making the top surface elevation of the steel track transverse to the bridge reach the target elevation range; installing side formwork, and pouring ultra-high performance concrete containing coarse aggregate in the side formwork, and vibrating the poured ultra-high performance concrete containing coarse aggregate along the steel track using a vibrating and laminating integrated machine until the elevation of the inclined surface reaches the target elevation range; and using the vibrating and laminating integrated machine to perform surface finishing and laminating to obtain a bridge deck pavement layer of ultra-high performance concrete containing coarse aggregate.

[0013] In combination with the third aspect, in one implementation, the plain round steel bars are installed above the horse stool.

[0014] In combination with the third aspect, in one embodiment, the expansion of the ultra-high performance concrete containing coarse aggregate is 480mm-550mm.

[0015] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0016] By adopting the ultra-high performance concrete containing coarse aggregate of the present invention for bridge deck paving, compared with conventional ultra-high performance concrete, the addition of coarse aggregate components (i.e. 600-700 parts of basalt crushed stone) significantly improves the compressive strength and tensile strength of concrete, while improving the durability and impermeability of concrete, further reducing the cost of bridge deck paving, and increasing the service life of the bridge deck pavement layer, thereby solving the technical problems of poor stress-bearing performance and insufficient durability of ordinary concrete cushion layers in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete in an embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the double-layer steel mesh controlling the elevation in the embodiment of the present application;

[0020] Figure 3 This is a flow chart of a method for paving a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete in an embodiment of the present application;

[0021] Figure 4 for Figure 3 Flow chart of step S30;

[0022] Figure 5 This is a schematic diagram of a steel bar track in an embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of the construction of the vibration and film-laminating integrated machine in the embodiment of the present application.

[0024] In the figure:

[0025] 1. Main body; 11. Part I; 12. Part II; 13. Part III;

[0026] 2. Single-layer steel mesh;

[0027] 3. Shear nails;

[0028] 4. Double-layer steel mesh; 41. Upper steel mesh; 42. Lower steel mesh;

[0029] 5. Elevation control reinforcement;

[0030] 6. Pad reinforcement;

[0031] 7. Steel bar track; 71. Plain round steel bar; 72. Horse stool;

[0032] 8. Side formwork;

[0033] 9. Vibrating and laminating machine. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] The embodiments of the present application provide an ultra-high performance concrete containing coarse aggregate, a bridge deck pavement layer and a paving method, which can solve the technical problems existing in the prior art that ordinary concrete cushion layers have poor stress-bearing performance and insufficient durability.

[0036] In a first aspect, an embodiment of the present application provides an ultra-high performance concrete containing coarse aggregate.

[0037] In one embodiment, the ultra-high performance concrete containing coarse aggregate includes, by weight, 500-600 parts of cement, 100-110 parts of microspheres, 40-50 parts of silica fume, 680-750 parts of river sand, 600-700 parts of basalt gravel, 140-160 parts of water, 15-20 parts of high-efficiency water reducing agent, and 40-50 parts of steel fiber.

[0038] In the present embodiment, cement is the main cementitious material of concrete, and its number (such as 500, 600, etc.) represents its strength grade. High-grade cement can provide better compressive and tensile strength, and is suitable for projects requiring high-strength support. In this ratio, the content of cement occupies a dominant position, ensuring the basic strength and stability of concrete. The hydration reaction of cement is the basis of concrete hardening. During the cement hydration process, it reacts with water to generate products such as hydrated calcium silicate (CSH) gel and calcium hydroxide (CH). These products tightly bond cement particles together to form a hardened structure of concrete.

[0039] Microbeads are extremely fine particles. When added to concrete, they can fill the gaps between cement particles, allowing free water to be discharged and increasing the fluidity of cement paste. At the same time, the spherical structure of microbeads can also play a ball effect, reduce the viscosity of concrete, and improve construction efficiency. In addition, microbeads can also improve the strength and durability of concrete after hardening. Silica fume is a high-performance admixture with a reasonable particle size distribution, strong density, high hardness, and good wear resistance.

[0040] The addition of silica fume can significantly improve the tensile, compressive, impact strength and wear resistance of concrete. At the same time, silica fume can also increase the thermal conductivity of concrete, change its adhesiveness and increase flame retardancy.

[0041] River sand is the fine aggregate in concrete, and together with cement, microspheres, etc., it constitutes the skeleton of concrete. The addition of river sand can improve the density and strength of concrete, while reducing the water seepage rate of concrete and improving the durability of concrete.

[0042] Basalt is a common volcanic rock with excellent properties such as high strength, high wear resistance and low water absorption. As a coarse aggregate in concrete, the addition of basalt crushed stone can significantly improve the compressive and tensile strength of concrete, while also improving the durability and impermeability of concrete.

[0043] Water is an indispensable component of concrete. It participates in the hydration reaction of cement and forms the hardened structure of concrete. In this mix, the water content is precisely controlled to ensure the working performance and strength of concrete. At the same time, by reasonably controlling the type and content of water, the durability of concrete can also be improved.

[0044] High-efficiency water reducer is an admixture that can significantly reduce the amount of water used in concrete. Its addition can increase the fluidity of concrete and improve the working performance of concrete without reducing the strength of concrete. At the same time, the addition of water reducer can also reduce the shrinkage and cracks of concrete and improve the durability of concrete.

[0045] Steel fiber is a high-performance fiber-reinforced material. Its incorporation can significantly improve the tensile strength and crack resistance of concrete, while also improving the durability and impact resistance of concrete. The incorporation of steel fiber is particularly important in projects that need to withstand greater tensile and impact forces.

[0046] To give a specific example: the ingredients of the ultra-high performance concrete containing coarse aggregate include 600 parts of cement, 100 parts of microspheres, 45 parts of silica fume, 720 parts of river sand, 650 parts of basalt gravel, 150 parts of water, 15 parts of high-efficiency water reducing agent, and 40 parts of steel fiber.

[0047] In this embodiment, by adopting the ultra-high performance concrete containing coarse aggregate of this scheme for bridge deck paving, compared with conventional ultra-high performance concrete, the coarse aggregate component (i.e. 600-700 parts of basalt crushed stone) is added, which significantly improves the compressive strength and tensile strength of concrete, while improving the durability and impermeability of concrete, further reducing the cost of bridge deck paving, and increasing the service life of the bridge deck pavement layer, thereby solving the technical problems of poor stress-bearing performance and insufficient durability of ordinary concrete cushion layers in the prior art.

[0048] In a second aspect, an embodiment of the present application provides a bridge deck pavement layer based on the above-mentioned ultra-high performance concrete containing coarse aggregate.

[0049] Reference Figure 1 , Figure 1 Schematic diagram of a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete in an embodiment of the present application. Figure 1 As shown, in one embodiment, the bridge deck pavement layer containing coarse aggregate ultra-high performance concrete includes a main body 1, a single-layer steel mesh 2, a plurality of shear nails 3 of different lengths, and a double-layer steel mesh 4. The main body 1 is cast by ultra-high performance concrete containing coarse aggregate. The top surface of the main body 1 is an inclined surface in the transverse direction of the bridge. The main body 1 is divided into a first part 11, a second part 12, and a third part 13 in the transverse direction of the bridge, and the first part 11 is located at the lower end of the inclined surface. The single-layer steel mesh 2 is buried in the first part 11. A plurality of shear nails 3 of different lengths are buried in the second part 12 and the third part 13. The double-layer steel mesh 4 is buried in the third part 13. Among them, the lengths of the plurality of shear nails 3 and the elevation of the steel bars of the double-layer steel mesh 4 increase as the inclined surface increases.

[0050] In this embodiment, the bridge deck pavement layer is mainly used for circular curve bridges. In order to offset the centrifugal force generated during driving, the bridge deck pavement layer in the circular curve area is designed to be a one-way transverse slope structure with a higher outer side of the curve and a lower inner side. In this embodiment, the main body 1 is cast from ultra-high performance concrete containing coarse aggregate, and its components have been disclosed in the previous embodiment and need not be repeated here. The top surface of the main body 1 is an inclined surface upward from the horizontal bridge, and the corresponding part is exactly the "one-way transverse slope structure of the curved bridge with a higher outer side and a lower inner side of the curve" mentioned above. At the same time, it also means that there is a continuously increasing elevation range of the inclined surface, which is defined as the target elevation range.

[0051] The main body 1 is divided into a first part 11, a second part 12 and a third part 13 in the transverse direction of the bridge. The first part 11 is set at the lower end of the slope, and the arrangement direction of the first part 11, the second part 12 and the third part 13 can be determined. In this embodiment, the main body 1 is only cast by ultra-high performance concrete containing coarse aggregate, and it is also necessary to bury a single-layer steel mesh 2 in the first part 11, a number of shear nails 3 of different lengths in the second part 12 and the third part 13, and a double-layer steel mesh 4 in the third part 13. The length of the shear nails 3 and the steel bar elevation of the double-layer steel mesh 4 increase as the slope rises. It can be found that using a single-layer steel mesh 2, a number of shear nails 3 of different lengths and a double-layer steel mesh 4 as the skeleton of the bridge deck pavement layer can effectively enhance the force-bearing performance and slope-fixing performance of the bridge deck pavement layer. In addition, the force-bearing structures embedded in the first part 11, the second part 12 and the third part 13 are different, especially the third part 13 embeds both the shear nails 3 and the double-layer steel mesh 4, which greatly improves the force-bearing performance of the outer side of the curve and enhances its durability.

[0052] In other embodiments, the junction between the second part 12 and the third part 13 can be connected by pre-embedded a part of the double-layer steel mesh 4 to ensure that the junction between the second part 12 and the third part 13 is more stable.

[0053] Furthermore, in one embodiment, the single-layer steel mesh 2 and the shear nails 3 are both pre-buried by welding, and the double-layer steel mesh 4 is pre-buried by binding. In this embodiment, the single-layer steel mesh 2 and the shear nails 3 are both pre-buried by welding, which can significantly improve the shear resistance of the single-layer steel mesh 2 and the shear nails 3, and improve the stability and bearing capacity of the bridge deck pavement layer. The double-layer steel mesh 4 is pre-buried by binding, which is relatively flexible, and the size, shape and position of the double-layer steel mesh 4 can be fine-tuned according to actual needs. In addition, the binding method can also ensure that the double-layer steel mesh 4 is more evenly stressed in the concrete. Through reasonable binding spacing and methods, it can be ensured that the double-layer steel mesh 4 will not be displaced or deformed when pouring concrete, thereby ensuring the stress performance of the structure.

[0054] Furthermore, in one embodiment, the double-layer steel mesh 4 includes an upper steel mesh 41 and a lower steel mesh 42. The upper steel mesh 41 adjusts the steel bar elevation through the elevation control ribs 5, and the lower steel mesh 42 controls the steel bar elevation through the pad ribs 6. In this embodiment, through the above-mentioned technical solution, the elevation of the upper and lower steel meshes 42 can be accurately controlled by using the elevation control ribs 5 and the pad ribs 6 to ensure that the position of the steel bars in the concrete is accurate. This helps to avoid dislocation or deformation of the steel bars and improves the controllability of the construction quality. At the same time, accurately controlling the elevation of the steel bars of the upper steel mesh 41 and the lower steel mesh 42 can form a more stable and uniform force system, which helps to enhance the bearing capacity of the bridge deck pavement layer and improve the overall stability and safety of the bridge deck pavement layer.

[0055] Further, in one embodiment, referring to Figure 2 , Figure 2 Schematic diagram of the double-layer steel mesh 4 controlling the elevation in the embodiment of the present application. Figure 2 As shown, the elevation control ribs 5 are supported below the upper steel mesh 41 and are arranged at equal intervals along the longitudinal direction; the pad bars 6 are supported below the lower steel mesh 42 and are arranged at equal intervals in a plum blossom shape. In this embodiment, the elevation control ribs 5 are supported below the upper steel mesh 41 and are arranged at equal intervals along the longitudinal direction to ensure that the entire upper steel mesh 41 is in the same horizontal plane. At the same time, supported by the elevation control ribs 5, the elevation of the steel bars of the upper steel mesh 41 in the transverse direction is within an elevation range. For example, the elevation control ribs 5 are generally formed by connecting a transverse steel bar and a plurality of vertical steel bars. The transverse steel bars are welded to the ends of the plurality of vertical steel bars. The lengths of the plurality of vertical steel bars increase as the inclined plane increases, ensuring that the transverse steel bars maintain a certain inclination angle with the horizontal plane, thereby allowing the upper steel mesh 41 to maintain a certain inclination angle in the transverse direction. The pad bars 6 are supported below the lower steel mesh 42 and are arranged in a plum blossom shape with equal spacing. This makes the force on the lower steel mesh 42 more uniform, which helps to reduce the risk of structural damage caused by excessive local force. In addition, by reasonably arranging the pad bars 6, the number of support points of the lower steel mesh 42 can be increased, thereby improving the bearing capacity of the entire structure.

[0056] In a third aspect, an embodiment of the present application provides a method for paving a bridge deck pavement layer based on the above-mentioned ultra-high performance concrete containing coarse aggregate.

[0057] Reference Figure 3 , Figure 3 Flow chart of the paving method of the bridge deck pavement layer containing coarse aggregate ultra-high performance concrete in the embodiment of the present application. Figure 3 As shown, in one embodiment, the steps of the paving method include:

[0058] Step S10, based on the target elevation range of the slope, the bridge deck is divided into three parts along the transverse direction of the bridge, namely, a first area, a second area and a third area.

[0059] In this embodiment, before the bridge deck pavement construction, the construction personnel can obtain the target elevation range of the top surface of the bridge deck pavement layer in the transverse direction of the bridge, that is, the target elevation range of the inclined surface, according to the construction drawings, and divide the bridge deck into the first area, the second area and the third area in the transverse direction of the bridge according to the three parts. In this way, the entire project can be decomposed into multiple relatively independent construction areas, so that the construction teams in each area can work in parallel, thereby significantly improving the construction efficiency.

[0060] Step S20, pre-embed a single-layer steel mesh 2 in the first area, pre-embed a plurality of shear nails 3 of different lengths in the second and third areas, and tie a double-layer steel mesh 4 in the third area, and the lengths of the plurality of shear nails 3 and the elevation of the steel bars of the double-layer steel mesh 4 increase as the slope increases.

[0061] In this embodiment, a single-layer steel mesh 2 is embedded in the first area, which can provide basic structural support and stability and enhance the bearing capacity of the area; a double-layer steel mesh 4 is tied in the third area, which can further increase the strength and stability of the structure, and is particularly suitable for areas that need to bear large loads or have complex stresses; shear nails 3 of different lengths are embedded in the second and third areas, which can effectively connect the double-layer steel mesh 4 and concrete, and improve the stability and bearing capacity of the bridge deck pavement. At the same time, as the slope increases, the length of the shear nails 3 is increased, which can better adapt to the stress distribution of the slope and reduce the risk of damage to the bridge deck pavement.

[0062] Step S30, pouring the coarse aggregate ultra-high performance concrete uniformly in each area until the elevation of the slope reaches the target elevation range, so as to obtain a bridge deck pavement layer of the coarse aggregate ultra-high performance concrete.

[0063] In this embodiment, the ultra-high performance concrete containing coarse aggregate has excellent mechanical properties, and its compressive strength, flexural tensile strength and elastic modulus are all higher than those of traditional concrete. The ultra-high performance concrete containing coarse aggregate is uniformly poured in each area until the elevation of the inclined surface reaches the target elevation range to obtain a bridge deck pavement layer containing ultra-high performance concrete containing coarse aggregate. The bridge deck pavement layer containing ultra-high performance concrete containing coarse aggregate obtained in this way also has the above-mentioned excellent mechanical properties, can resist the erosion of various harsh environments and loads, and extend the service life of the bridge deck pavement layer.

[0064] Furthermore, in one embodiment, the target elevation range includes three continuous elevation ranges, and the first part 11, the second part 12 and the third part 13 of the main body 1 correspond to an elevation range respectively, the elevation range corresponding to the first part 11 is smaller than the elevation range corresponding to the second part 12, and the elevation range corresponding to the second part 12 is smaller than the elevation range corresponding to the third part 13.

[0065] In this embodiment, the target elevation range includes three continuous elevation ranges, and the first part 11, the second part 12, and the third part 13 of the main body 1 correspond to one elevation range respectively. Among them, the elevation range corresponding to the first part 11 is smaller than the elevation range corresponding to the second part 12, and the elevation range corresponding to the second part 12 is smaller than the elevation range corresponding to the third part 13. For example, if the target elevation range is [3.5cm, 15cm], then the elevation range corresponding to the first part 11 is [3.5cm, 5cm], the elevation range corresponding to the second part 12 is [5cm, 15cm], and the elevation range corresponding to the third part 13 is [13cm, 15cm].

[0066] In this embodiment, it is also necessary to explain that no matter the first part 11, the second part 12 or the third part 13, the corresponding embedded parts (such as the single-layer steel mesh 2, the shear nails 3 and the double-layer steel mesh 4) inside will be covered by the ultra-high performance concrete containing coarse aggregate to form a concrete protective layer. Therefore, the above three continuous elevation ranges are only used to divide the first area, the second area and the third area, that is, to determine the corresponding embedded areas of the single-layer steel mesh 2, the shear nails 3 and the double-layer steel mesh 4. As for how to calculate the steel bar elevation of the single-layer steel mesh 2, the length of the shear nails 3 and the steel bar elevation of the double-layer steel mesh 4, it is sufficient to subtract the thickness of the concrete protective layer from the target elevation range.

[0067] Further, in one embodiment, referring to Figures 4 to 6 , Figure 4 for Figure 3 Flow chart of step S30; Figure 5 This is a schematic diagram of a steel bar track 7 in an embodiment of the present application; Figure 6 This is a schematic diagram of the construction of the vibrating and coating integrated machine 9 in the embodiment of the present application. Step S30 includes:

[0068] Step S301, erecting a steel track 7 consisting of plain round steel bars 71 and horse stools 72, and making the top surface elevation of the steel track 7 in the transverse direction of the bridge reach a target elevation range.

[0069] In this embodiment, the steel rail 7 is composed of plain round steel bars 71 and horse stools 72. The plain round steel bars 71 are cut according to the preset segment length, and naturally extend along the bridge circular curve by overlapping the segments. The curved track is formed by replacing the curve with a straight line. The overlapping length between adjacent segments should not be less than 2 times the spacing of the horse stools 72. At the same time, the top surface elevation of the steel rail 7 in the transverse direction of the bridge needs to reach the target elevation range, so that the top surface elevation of the steel rail 7 in the transverse direction of the bridge can be used as a reference for casting.

[0070] Step S302, install the side formwork 8, and pour the ultra-high performance concrete containing coarse aggregate in the side formwork 8, and use the vibrating and laminating integrated machine 9 to vibrate the poured ultra-high performance concrete containing coarse aggregate along the steel rail 7 until the elevation of the slope reaches the target elevation range.

[0071] Step S303, using the vibrating and coating integrated machine 9 to perform surface finishing and coating to obtain a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete.

[0072] In this embodiment, a side formwork 8 is installed on the bridge deck, and the area to be poured (in this embodiment, the area to be poured includes the first area, the second area and the third area) is equally divided by the side formwork 8. The ultra-high performance concrete containing coarse aggregate is poured into the side formwork 8 in equal portions by using a sky pump to ensure that the poured ultra-high performance concrete containing coarse aggregate is more evenly distributed on the bridge deck, avoiding the occurrence of local uneven thickness or leakage. The poured ultra-high performance concrete containing coarse aggregate is vibrated along the steel rail 7 by using a vibrating and coating integrated machine 9, which can expel bubbles and voids in the concrete and improve the density and strength of the pavement layer until the elevation of the inclined surface reaches the target elevation range. Finally, the vibrating and coating integrated machine 9 is used to collect and coat the surface, and the concrete surface is smoothed. In this way, a bridge deck pavement layer of ultra-high performance concrete containing coarse aggregate is obtained, and its impermeability, wear resistance and crack resistance are all improved.

[0073] Further, in one embodiment, if Figure 5 As shown, the plain round steel bar 71 is erected above the horse stool 72. In this embodiment, the horse stool 72 is a "door" shaped structure formed by connecting two vertical steel bars and one horizontal steel bar. The plain round steel bar 71 is erected above the horse stool 72. In order to limit the movement of the plain round steel bar 71 arranged above the horse stool 72, the end surface height of the vertical steel bar is higher than the top surface height of the horizontal steel bar, but does not exceed the top surface height of the plain round steel bar 71. Among them, the spacing between two adjacent horse stools 72 is specifically set according to actual construction requirements, and is not specifically limited in this embodiment.

[0074] In addition, the top elevation of the steel rail 7 is controlled by the height of the saddle 72. The inclination angle of the inclined surface can be changed by adjusting the top elevations of the steel rails 7 on both sides of the bridge deck in the transverse direction. Before construction, the top elevations of the saddle 72 and the round steel bars 71 should be checked at equal intervals to ensure that there is no error in the top elevation of the bridge deck pavement in the transverse direction.

[0075] Furthermore, in one embodiment, the expansion of the ultra-high performance concrete containing coarse aggregate is 480mm-550mm. In this embodiment, by adjusting the expansion of the ultra-high performance concrete containing coarse aggregate to within the range of 480mm-550mm, a perfect balance between the material's slope fixation and pumpability is achieved, greatly broadening the application scope of ultra-high performance concrete.

[0076] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0077] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0078] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An ultra-high performance concrete containing coarse aggregate, characterized in that: The ultra-high performance concrete containing coarse aggregate comprises the following components by weight: 500-600 parts of cement, 100-110 parts of microspheres, 40-50 parts of silica fume, 680-750 parts of river sand, 600-700 parts of basalt gravel, 140-160 parts of water, 15-20 parts of high-efficiency water reducing agent, and 40-50 parts of steel fiber.

2. A bridge deck pavement layer based on the ultra-high performance concrete containing coarse aggregate according to claim 1, characterized in that: include: The main body (1) is cast from ultra-high performance concrete containing coarse aggregate, and its top surface is an inclined surface in the transverse direction. The main body (1) is divided into a first part (11), a second part (12) and a third part (13) in the transverse direction, and the first part (11) is located at the lower end of the inclined surface; A single-layer steel mesh (2) buried inside the first part (11); A plurality of shear studs (3) of different lengths, which are embedded inside the second part (12) and the third part (13); A double-layer steel mesh (4) buried inside the third part (13); The lengths of the plurality of shear nails (3) and the height of the steel bars of the double-layer steel mesh (4) increase as the slope increases.

3. The bridge deck pavement layer containing coarse aggregate ultra-high performance concrete according to claim 2, characterized in that: The single-layer steel mesh (2) and the shear nails (3) are both pre-buried by welding, and the double-layer steel mesh (4) is pre-buried by binding.

4. The bridge deck pavement layer containing coarse aggregate ultra-high performance concrete according to claim 3, characterized in that: The double-layer steel mesh (4) comprises an upper steel mesh (41) and a lower steel mesh (42); the upper steel mesh (41) adjusts the steel bar elevation through elevation control bars (5), and the lower steel mesh (42) controls the steel bar elevation through pad bars (6).

5. The bridge deck pavement layer containing coarse aggregate ultra-high performance concrete according to claim 4, characterized in that: The elevation control bars (5) are supported below the upper steel mesh (41) and are arranged at equal intervals along the longitudinal bridge direction; the cushion bars (6) are supported below the lower steel mesh (42) and are arranged at equal intervals in a plum blossom shape.

6. A method for paving a bridge deck pavement layer based on the coarse aggregate ultra-high performance concrete according to any one of claims 2 to 5, comprising: Based on the target elevation range of the slope, the bridge deck is divided into the first area, the second area and the third area in the transverse direction of the bridge according to three parts; A single-layer steel mesh (2) is embedded in the first area, a plurality of shear nails (3) of different lengths are embedded in the second area and the third area, and a double-layer steel mesh (4) is tied in the third area, wherein the lengths of the plurality of shear nails (3) and the height of the steel bars of the double-layer steel mesh (4) increase as the slope increases; The coarse aggregate ultra-high performance concrete is uniformly poured in each area until the elevation of the slope reaches the target elevation range to obtain a bridge deck pavement layer containing the coarse aggregate ultra-high performance concrete.

7. The method for paving a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete according to claim 6, characterized in that: The target elevation range includes three continuous elevation ranges, and the first part (11), the second part (12) and the third part (13) of the main body (1) respectively correspond to an elevation range, the elevation range corresponding to the first part (11) is smaller than the elevation range corresponding to the second part (12), and the elevation range corresponding to the second part (12) is smaller than the elevation range corresponding to the third part (13).

8. The method for paving a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete according to claim 6, characterized in that: The ultra-high performance concrete containing coarse aggregate is uniformly poured in each area until the elevation of the slope reaches the target elevation range to obtain a bridge deck pavement layer containing the ultra-high performance concrete containing coarse aggregate, the steps comprising: A steel bar track (7) composed of plain round steel bars (71) and a horse stool (72) is installed, and the top surface elevation of the steel bar track (7) in the transverse direction of the bridge reaches a target elevation range; Installing a side formwork (8), pouring ultra-high performance concrete containing coarse aggregate in the side formwork (8), and vibrating the poured ultra-high performance concrete containing coarse aggregate along the steel rail (7) using a vibrating and laminating integrated machine (9) until the elevation of the inclined surface reaches a target elevation range; The vibrating and coating integrated machine (9) is used to perform surface finishing and coating to obtain a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete.

9. The method for paving a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete according to claim 8, characterized in that: The plain round steel bar (71) is installed above the horse stool (72).

10. The method for paving a bridge deck pavement layer containing coarse aggregate ultra-high performance concrete according to claim 6, characterized in that: The expansion degree of the ultra-high performance concrete containing coarse aggregate is 480mm-550mm.

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