Ultra-tough cement seamless joint structure and construction method therefor

Abstract

The present invention relates to the technical field of seamless jointing for bridges and tunnels, and in particular to an ultra-tough cement seamless joint structure and a construction method. The technical key points are as follows: the ultra-tough cement seamless joint structure is arranged in a pavement cushion layer structure, and is a seamless joint structure consisting of a base layer, a pavement cushion layer, an ultra-tough cement structure, a pavement surface layer, and a filling sealing strip; rough adhesive-surface jointing is employed, interlocking rough surfaces and an interface agent are used to enhance the connection via a combination of physical and chemical methods, and wedge-shaped engagement slots are provided to achieve position-limiting fixation and a staggered joint configuration; an ultra-tough cement jointing material comprises dry mix, nano active powder, composite fibers, admixtures, and water; and the high-strength interface agent comprises two components: an epoxy resin and a curing agent. The ultra-tough cement seamless joint structure provided by the present invention is applicable to bridge and tunnel engineering construction, can meet the requirements for long-life seamless pavement, and provides reliable assurance for driving safety and comfort.

Description

A super-tough cement seamless splicing structure and construction method thereof Technical Field

[0001] The present invention relates to the technical field of seamless splicing of bridges and tunnels, and in particular to an ultra-tough cement seamless splicing structure and a construction method thereof. Background Art

[0002] With the advancement of society and the rapid development of transportation, bridge and tunnel expansion joints have become a key technology in steel bridge construction. Seamless joints, as a type of expansion joint, maximize deformation coordination with the pavement structure while maintaining excellent adhesion to the pavement material, maintaining smoothness and driving comfort. Therefore, they are frequently used in pavement construction.

[0003] my country's expressways are constantly expanding and developing, with increasing traffic volume, especially the growing proportion of truck traffic. The complex stresses in bridge and tunnel joints have long been a weak link in pavement structures. Conventional asphalt joint materials suffer from insufficient durability. Under the influence of factors such as fluctuating ambient temperatures, repeated vehicle loads, and deformation in bridge and tunnel joints, joints are increasingly susceptible to high stress, large deformation, and high-cycle fatigue damage, impacting smooth and comfortable driving conditions. Summary of the Invention

[0004] The purpose of the present invention is to provide an ultra-tough cement seamless splicing structure and its construction method to solve the problems of high stress, large deformation and high cycle fatigue damage in bridge and tunnel splicing joints, improve the overall durability of bridge and tunnel pavement structures, and improve the smoothness and comfort of road driving.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] The present invention provides an ultra-tough cement seamless splicing structure, which comprises, from bottom to top, a base layer, a pavement cushion layer, and a paving surface layer; wherein the pavement cushion layer comprises an ultra-tough cement structure spliced ​​together, and the ultra-tough cement structure is seamed to the pavement cushion layer and the base layer via a rough rubber surface; the width of the ultra-tough cement structure and the elongation of the ultra-tough cement structure material satisfy the following relationship:

[0007] ,

[0008] in, is the elongation of super-tough cement structural material, the unit is 1;

[0009] L is the width of the super-tough cement structure, in mm;

[0010] f is the adjustment coefficient, the unit is mm -1 .

[0011] Furthermore, the value of f is 1.

[0012] Through data fitting, the present invention obtains the relationship between the elongation of the ultra-tough cement seamless splicing material and the width of the ultra-tough cement structure. From the relationship, it can be seen that while keeping the deformation of the ultra-tough cement structure unchanged, the smaller the width of the ultra-tough cement structure, the greater the elongation of the ultra-tough cement material should be. Otherwise, problems such as cracking at the splicing parts and interface slippage will occur, resulting in a decrease in the usability and durability of the bridge and tunnel splicing seams.

[0013] Furthermore, the width of the super-tough cement structure is 200~2000mm; the elongation of the super-tough cement structure material is 0.5~2.5%.

[0014] Furthermore, calculated by weight, the ultra-tough cement structural material includes the following components: 65-70 parts of dry mix, 10-18 parts of nano active powder, 14-22 parts of composite fiber, 1-2 parts of shrinkage reducing admixture and 3-5 parts of water.

[0015] Furthermore, the addition amounts of the composite fiber and the shrinkage-reducing admixture satisfy the following relationship: ;

[0016] in, is the elongation of super-tough cement structural material, the unit is 1;

[0017] p and q are adjustment coefficients, in g -1 ;

[0018] m1 is the amount of composite fiber added, in g;

[0019] m2 is the amount of shrinkage reducing admixture added, the unit is g.

[0020] Furthermore, the values ​​of p and q are both 1.

[0021] The present invention uses the above formula to adjust the proportional relationship between the addition amounts of composite fibers and shrinkage-reducing admixtures in the material component formula according to the elongation of the ultra-tough cement structural material, thereby obtaining a material composition that is more suitable for the width of the ultra-tough cement structure, making the deformation of the ultra-tough cement structure more reasonable, and greatly improving the durability of the bridge and tunnel joints and the comfort of road driving.

[0022] Furthermore, calculated by weight, the dry mix includes the following components: 55-70 parts of cement, 20-30 parts of quartz sand powder, 8-15 parts of fly ash and 4-10 parts of steel slag powder.

[0023] Furthermore, the composite fiber includes a mixture of any one or more of steel fiber, polyethylene fiber or basalt fiber.

[0024] Furthermore, the shrinkage reducing admixture is a mixture of a magnesium oxide expansion agent and a polycarboxylate water reducer, wherein the mass ratio of the magnesium oxide expansion agent to the polycarboxylate water reducer is (2~5):1.

[0025] Furthermore, the nano active powder is any one of ultrafine calcium carbonate or silicon dioxide or a mixture of the two with a particle size of 20 to 800 nm.

[0026] Furthermore, a wedge-shaped slot is provided at the joint interface between the super-tough cement structure and the pavement cushion layer, for limiting and fixing the super-tough cement structure and the pavement cushion layer.

[0027] Furthermore, the cross-section of the wedge-shaped slot is an inverted trapezoid, with an upper width of 100~200mm, a lower width of 50~100mm, a depth of 50~80mm, a length of 300~900mm, a spacing of 300~600mm, a step height of 150~200mm, and a step width of 250~350mm.

[0028] Furthermore, the wedge-shaped slots are staggered, the width of the staggered table is 200~500mm, and the height of the upper and lower steps is 100~200mm.

[0029] In the present invention, the above structure is adopted, which, on the one hand, increases the splicing connection surface, thereby increasing the bonding stress, and at the same time avoids the occurrence of vertically penetrating splicing cracks, thereby ensuring the stability of the overall structure.

[0030] Furthermore, a filling sealing strip is provided at the joint between the base layer and the pavement cushion layer.

[0031] Furthermore, the filling sealing strip is made of rubber, sponge or steel, has a diameter of 12 to 20 mm, and is not limited to a circular, square or other special-shaped shape.

[0032] Furthermore, the surface of the filling sealing strip is flush with the base layer.

[0033] Furthermore, in the super-tough cement structure, prestressed portal frame reinforcement is also provided along the length direction, and the prestressed portal frame reinforcement includes an inverted Ω bending stress reinforcement, at least one inverted U embedded reinforcement and at least one splicing surface transverse anchor reinforcement;

[0034] The raised part in the middle of the inverted U embedded reinforcement is connected to the concave part of the inverted Ω bent reinforcement, the end of the inverted Ω bent reinforcement overlaps one end of the transverse anchor reinforcement of the splicing surface, and the height of the end of the inverted Ω bent reinforcement is higher than the height of the transverse anchor reinforcement of the splicing surface.

[0035] In the present invention, the super-tough cement structure can be cast on site or prefabricated; the prefabricated module has a length of 0.5 to 4 meters. According to the fixed position of the reserved wedge-shaped slot, high-strength interface agent and super-tough cement are injected successively along the inverted U-shaped reinforcement hole and the transverse anchor reinforcement hole, which saves the on-site construction time of the pavement. At the same time, considering the convenience of later maintenance, modular replacement is fast and convenient.

[0036] Furthermore, the diameter of the prestressed portal frame reinforcement is 12~20mm, the height of the bending force reinforcement is 150~250mm, the distance between the bottom surface and the foundation layer is 50~150mm, and the prestressed tension is set to 2~12MPa.

[0037] Furthermore, the rough rubber surface comprises a chiseled concave-convex surface and a high-strength interface layer coated on the chiseled concave-convex surface, and the chiseled concave-convex surface is formed by milling the original road surface.

[0038] Furthermore, the roughness of the chiseled concave-convex surface and the coating amount of the high-strength interface agent used in the high-strength interface layer satisfy the following relationship:

[0039] ;

[0040] Where A is the ratio of the interface bite force to the interface connection force, and the unit is 1;

[0041] h is the roughness, reflecting the height difference between the concave and convex parts of the interface, and the unit is mm;

[0042] w is the coating amount of high-strength interface agent, the unit is kg / m 2 ;

[0043] B is the ratio of chemical bonding force to the total interfacial bonding force, with the unit being 1;

[0044] a and b are exponential constants with the unit being 1;

[0045] k is the adjustment coefficient, the unit is mm -1 ;

[0046] c is the adjustment coefficient, the unit is 1×10 6 mm 2 / kg.

[0047] Furthermore, the aggregate exposure rate of the roughened concave and convex surface is 25-35% of the maximum aggregate particle size.

[0048] Furthermore, the roughness of the roughened concave and convex surface is 5 to 10 mm, and the processed area is ≥90%.

[0049] In the present invention, the interface roughness is controlled within the range of 5-10 mm, corresponding to the coating amount of the high-strength interface agent of 0.8-1.2 kg / m 2, and the aggregate exposure rate is required to account for 25~35% of the maximum particle size; the reason is that the coarse aggregate particle size in concrete is generally less than 20mm, the roughness is 5~10mm, that is, the rough surface unevenness is in the range of 5~10mm, and 25~35% of the aggregate particle size is exposed, which can remove the floating slurry and loose cement stone on the concrete surface and enhance the reliability of the interface connection; if the rough surface unevenness is less than 5mm, the floating slurry is not completely removed, and the bite force formed by the unevenness is insufficient; if the rough surface unevenness is greater than 10mm, the surface of some aggregates covered by cement is less than 50%, the embedding force is not strong and it is easy to cause the aggregate to loosen.

[0050] Furthermore, the high-strength interface agent is composed of the following components, calculated by weight: a polycondensation product consisting of 55-65 parts of polyhydroxy epoxy resin, 10-15 parts of isocyanate polyurethane, 5-12 parts of unsaturated polyester and 16-28 parts of amidoamine curing agent; the coating amount of the high-strength interface agent is 0.8-1.2 kg / m 2 .

[0051] Furthermore, the unsaturated polyester is prepared by polycondensation of maleic anhydride, maleic acid, phthalic anhydride and a styrene crosslinker, and has an acidity of 40-60 mg KOH / g, which can promote a full reaction while avoiding volatilization that affects the quality.

[0052] Furthermore, the mass ratio of maleic anhydride, maleic acid, phthalic anhydride and styrene crosslinker is 2:3:4:1, and the temperature of the polycondensation reaction is controlled at 180-220°C.

[0053] Furthermore, the amide curing agent is obtained by polycondensation of diglycidyl ester and diethylenetriamine, and has an amine value of 220-380 mg KOH / g, ensuring excellent flexibility and impact resistance, while having excellent bonding properties.

[0054] The present invention also provides a construction method for an ultra-tough cement seamless splicing structure, which utilizes a physical and chemical combination of a concave-convex rough surface and an interface agent, and the matrix and the slot are arranged to increase the connection surface and strengthen the connection, thereby ensuring the overall performance of the ultra-tough cement seamless splicing structure.

[0055] The construction method provided by the present invention comprises the following steps:

[0056] S1. Clear the construction site of the super-tough cement structure, the excess pavement cushion on the foundation layer, and set a wedge-shaped slot;

[0057] S2. Set roughened concave and convex surfaces at the construction locations of the tough cement structure of the pavement cushion layer and the base layer;

[0058] S3. Install filling sealing strips at the expansion joints;

[0059] S4. Install prestressed door reinforcement frames at the construction location of the super-tough cement structure;

[0060] S5. Apply a high-strength interface agent on the surface of the roughened concave and convex surface;

[0061] S6. Prepare super-tough cement structural materials, pour the super-tough cement structural materials at the construction location of the super-tough cement structure, and vibrate and level them;

[0062] S7. After the super-tough cement structural material has initially solidified, smooth the surface and lay the paving surface after curing.

[0063] Furthermore, the above construction method is specifically as follows:

[0064] S1. Remove excess cushioning at the joints of super-tough cement and set staggered wedge-shaped slots with a step height of 150-200mm, a step width of 250-350mm, an upper width of 100-200mm, a lower width of 50-100mm, a depth of 50-80mm, a length of 300-900mm, and a spacing of 300-600mm.

[0065] S2. Roughen the rubber surface on the connection surface between the pavement cushion layer, base layer and super-tough cement structure, and roughen the concave and convex surface to 5-10mm. The treatment area should be ≥90%, with 25-35% of the aggregate exposed, and the residual particles should be cleaned.

[0066] S3. Install rubber, sponge or steel filling sealing strips at the expansion joints. The diameter should be 12-20mm. The shape is not limited to round, square or other special shapes. The surface should be flush with the structural foundation layer.

[0067] S4. Install prestressed reinforcement frames, including bent reinforcement and portal frame embedded reinforcement. The reinforcement diameter is 12-32 mm. The bent reinforcement is inverted Ω shape, 150-250 mm high, and the bottom surface is 50-150 mm from the foundation layer. The prestressed tension is set at 2-12 MPa.

[0068] S5. Prepare a high-strength interface agent by weight with 55-65 parts of polyhydroxy epoxy resin, 10-15 parts of isocyanate polyurethane, 5-12 parts of unsaturated polyester and 16-28 parts of amidoamine curing agent, and control the coating amount to 0.8-1.2 kg / m 2 ;

[0069] S6. Prepare an ultra-tough cement by using 65-70 parts of dry mix, 10-18 parts of nano active powder, 14-22 parts of composite fiber, 1-2 parts of shrinkage reducing admixture, and 3-5 parts of water, calculated by weight, wherein the dry mix includes 55-70 parts of high-performance cement, 20-30 parts of quartz sand powder, 8-15 parts of fly ash, and 4-10 parts of steel slag powder, to prepare an ultra-tough cement structural material;

[0070] S7. Super tough cement is evenly poured and spliced. After vibrating and leveling, it is smoothed and plastered after initial setting, and water mist is sprayed for moisturizing maintenance in time. The paving surface can be applied after 7 days.

[0071] Furthermore, the construction method provided by the present invention is a super-tough cement structure prefabrication + on-site assembly, specifically comprising:

[0072] S1. Select modules and assemble them according to the actual needs of the site. The length of the prefabricated super-tough cement structure module is 0.5~4m, and the cross-section is stepped, wide at the top and narrow at the bottom. The two sides protrude downward to form a wedge-shaped buckle. The upper and lower widths are 1~3cm smaller than the width of the splicing position.

[0073] S2. Install prestressed reinforcement frames, including curved reinforcement and portal frame embedded reinforcement. The reinforcement diameter is 12-32 mm. The curved reinforcement is inverted Ω shape, 150-250 mm high, and the bottom surface is 50-150 mm from the foundation layer. The prestressing tension is set at 2-12 MPa. The ultra-tough cement structure is prefabricated in the factory, and corresponding U-shaped reinforcement holes and transverse anchorage holes are reserved.

[0074] S3. Reserve wedge-shaped slots at the on-site splicing locations and clear any debris. The step height should be 150-200mm, the step width 250-350mm, the slot width at the top 100-200mm, the bottom 50-100mm, the depth 50-80mm, the length 300-900mm, and the spacing 300-600mm.

[0075] S4. After the prefabricated super-tough cement structural components have reached 80% of the design strength, high-strength interface agent and super-tough cement are injected successively along the inverted U-shaped reinforcement holes and transverse anchor reinforcement holes according to the reserved wedge-shaped slot fixing positions, saving on-site pavement construction time. At the same time, considering the convenience of later maintenance, modular replacement is carried out quickly and efficiently.

[0076] In summary, the present invention has the following beneficial effects:

[0077] (1) The present invention discloses a construction method of an ultra-tough cement seamless splicing structural agent, which comprises a base layer, a pavement cushion layer, ultra-tough cement and a paving surface layer and a filling sealing strip. The splicing interface adopts a rough rubber surface, and is provided with a wedge-shaped card slot limit fixation and a staggered joint structure. By combining the physicochemical properties of the concave and convex rough surface and the interface agent, the bonding force between the splicing structure and the original pavement is greatly improved, thereby ensuring the overall performance of the ultra-tough cement seamless splicing structure while ensuring the comfort of driving on the road.

[0078] (2) The ultra-tough cement splicing material provided by the present invention includes a dry mix, nano-active powder, composite fiber, admixture and water; the high-strength interface agent includes two components, epoxy resin and curing agent; it is suitable for use in bridge and tunnel engineering construction, can meet the requirements of long-life seamless pavement, and provide reliable protection for driving safety and comfort performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] FIG1 is a schematic structural diagram of a super-tough cement seamless splicing structure of the present invention;

[0080] FIG2 is a top view of the super-tough cement seamless splicing structure of the present invention;

[0081] FIG3 is a schematic structural diagram of the ultra-tough cement structure of the present invention;

[0082] FIG4 is a schematic structural diagram of a prefabricated ultra-tough cement structure of the present invention;

[0083] FIG5 is a fitting curve of the width of the ultra-tough cement structure and the elongation of the ultra-tough cement structure material of the present invention;

[0084] FIG6 is a fitting curve of the elongation of the ultra-tough cement structural material of the present invention and the addition amount of composite fiber and shrinkage-reducing admixture.

[0085] Reference numerals

[0086] 1. Base layer, 2. Pavement cushion layer, 3. Super-tough cement structure, 4. Pavement surface layer, 5. Filling seal, 6. Rough rubber surface, 7. Wedge-shaped slot, 81. Inverted Ω bending reinforcement, 82. Inverted U embedded reinforcement, 83. Horizontal anchor reinforcement for the splicing surface, 31. U-shaped reinforcement hole, 32. Horizontal anchor reinforcement hole. DETAILED DESCRIPTION

[0087] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, a super-tough cement seamless splicing structure and its construction method proposed in accordance with the present invention, its specific implementation method, characteristics and effects are described in detail as follows.

[0088] Source of raw materials:

[0089] Cement: Conch high-performance Portland cement ;

[0090] Quartz sand powder: Quartz sand produced in Huanggang, Hubei;

[0091] Fly ash: fly ash produced in Shijiazhuang, Hebei;

[0092] Steel slag powder: Shandong Zibo steel slag;

[0093] Ultrafine calcium carbonate: 200-2500 mesh nano calcium carbonate;

[0094] Polyethylene fiber: Japan Toray PVA;

[0095] Shrinkage reducing admixture: magnesium expansion agent KBS-M5;

[0096] Polyhydroxy epoxy resin: Huayi AFG-90 hydroxy resin, purity 99.9%;

[0097] Isocyanate polyurethane: BASF isocyanate M20S;

[0098] Maleic anhydride: Maleic anhydride / CAS 108-31-6;

[0099] Phthalic anhydride: Phthalic anhydride (PA) C8H4O3;

[0100] Styrene crosslinker: Luxi YS041 styrene;

[0101] Diglycidyl ester: TCI diglycidyl ester;

[0102] Diethylenetriamine: German Merck reagent D93856, concentration 99%;

[0103] Steel fiber: copper-plated steel fiber 2850MPa;

[0104] Polyethylene fiber: Japan Toray PVA;

[0105] Basalt fiber: Jiangsu Sky BF;

[0106] Magnesium oxide expansion agent: magnesium expansion agent KBS-M5;

[0107] Polycarboxylate water reducer: Jiangsu Subote high efficiency water reducer;

[0108] Calcium carbonate: 200-2500 mesh nano calcium carbonate;

[0109] Silica: 30±5nm silicon dioxide.

[0110] This specific embodiment provides an ultra-tough cement seamless splicing structure, as shown in FIG1 , which includes, from bottom to top, a base layer 1, a pavement cushion layer 2, and a pavement surface layer 4; wherein the pavement cushion layer 2 includes an ultra-tough cement structure 3 spliced ​​therein, and the ultra-tough cement structure 3 is connected to the pavement cushion layer 2 and the base layer 1 by a rough rubber surface 6; the width of the ultra-tough cement structure 3 and the elongation of the ultra-tough cement structure material satisfy the following relationship, and the fitting curve is shown in FIG5 :

[0111] ,

[0112] in, is the elongation of super-tough cement structural material, the unit is 1;

[0113] L is the width of the super-tough cement structure 3, in mm;

[0114] f is the adjustment coefficient, the unit is mm -1 .

[0115] Here, the value of f is 1.

[0116] In some preferred embodiments, the width of the super-tough cement structure 3 is 200-2000 mm, and the elongation of the super-tough cement structure material is 0.5-2.5%.

[0117] Calculated by weight, the ultra-tough cement structural material includes the following components: 65-70 parts of dry mix, 10-18 parts of nano-active powder, 14-22 parts of composite fiber, 1-2 parts of shrinkage-reducing admixture and 3-5 parts of water.

[0118] In actual engineering, the material of the seamless joint has good deformation resistance, that is, elongation. In this specific embodiment, the seamless joint width of ultra-tough cement concrete is 200-2000 mm. The smaller the joint width, the higher the elongation requirement of the material. The corresponding ultra-tough cement elongation range is 0.5-2.5%. The elongation of the ultra-tough cement material is mainly affected by the amount of composite fiber and shrinkage-reducing admixture. The addition amount of composite fiber and shrinkage-reducing admixture satisfies the following relationship. The fitting curve is shown in Figure 6: ;

[0119] in, is the elongation of super-tough cement structural material, the unit is 1;

[0120] p and q are adjustment coefficients, in g -1 ;

[0121] m1 is the amount of composite fiber added, in g;

[0122] m2 is the amount of shrinkage reducing admixture added, the unit is g.

[0123] Among them, the values ​​of p and q are both 1.

[0124] In some preferred embodiments, the material of the composite fiber includes but is not limited to a mixture of any one or more of steel fiber, polyethylene fiber or basalt fiber; the shrinkage reducing admixture is a mixture of magnesium oxide expansion agent and polycarboxylate water reducer.

[0125] In some preferred embodiments, the dry mix includes the following components, calculated by weight: 55-70 parts of cement, 20-30 parts of quartz sand powder, 8-15 parts of fly ash, and 4-10 parts of steel slag powder.

[0126] In some preferred embodiments, the nano active powder is any one of ultrafine calcium carbonate or silicon dioxide or a mixture of the two with a particle size of 20 to 800 nm.

[0127] In this specific embodiment, as shown in Figures 1 and 2, a wedge-shaped slot 7 is provided at the joint interface between the super-tough cement structure 3 and the pavement cushion layer 2 for limiting and fixing the super-tough cement structure 3 and the pavement cushion layer 2.

[0128] In some preferred embodiments, the cross-section of the wedge-shaped slot 7 is an inverted trapezoid, with an upper width of 100~200mm, a lower width of 50~100mm, a depth of 50~80mm, a length of 300~900mm, a spacing of 300~600mm, a step height of 150~200mm, and a step width of 250~350mm; in some preferred embodiments, the wedge-shaped slot 7 is staggered, the staggered table width is 200~500mm, and the upper and lower step heights are 100~200mm.

[0129] As shown in FIG1 and FIG2 , a filling sealing strip 5 is further provided at the joint between the base layer 1 and the pavement cushion layer 2 .

[0130] In some preferred embodiments, the material of the filling sealing strip 5 is preferably rubber, sponge or steel, with a diameter of 12~20 mm, and the shape is not limited to round, square or other special shapes; the surface of the filling sealing strip 5 is flush with the base layer 1.

[0131] As shown in Figure 1, in the super-tough cement structure 3, prestressed portal frame reinforcement is also arranged along the length direction. The prestressed portal frame reinforcement includes an inverted Ω curved stress reinforcement 81, at least one inverted U embedded reinforcement 82 and at least one splicing surface transverse anchor reinforcement 83. The middle convex part of the inverted U embedded reinforcement 82 is connected to the concave part of the inverted Ω curved stress reinforcement 81, and the two end parts of the inverted Ω curved stress reinforcement 81 are overlapped with one end of the two splicing surface transverse anchor reinforcements 83 respectively. The height of the end part of the inverted Ω curved stress reinforcement 81 is higher than the height of the splicing surface transverse anchor reinforcement 83.

[0132] In some preferred embodiments, the diameter of the prestressed portal frame reinforcement is 12~20 mm, the height of the inverted Ω bent stress reinforcement 81 is 150~250 mm, and the distance between the bottom surface of the prestressed portal frame reinforcement and the foundation layer 1 is 50~150 mm, and the prestressed tension of the prestressed portal frame reinforcement is set to 2~12 MPa.

[0133] In this specific embodiment, the rough rubber surface 6 is composed of a chiseled concave and convex surface and a high-strength interface layer coated on the chiseled concave and convex surface. The chiseled concave and convex surface is formed by milling the original road surface; the aggregate exposure rate of the chiseled concave and convex surface is 25~35% of the maximum particle size of the aggregate, the roughness is 5~10mm, and the treated area is ≥90%.

[0134] The roughness of the chiseled concave-convex surface and the coating amount of the high-strength interface agent used in the high-strength interface layer satisfy the following relationship:

[0135] ;

[0136] Where A is the ratio of the interface bite force to the interface connection force, and the unit is 1;

[0137] h is the roughness, reflecting the height difference between the concave and convex parts of the interface, and the unit is mm;

[0138] w is the coating amount of high-strength interface agent, the unit is kg / m 2 ;

[0139] B is the ratio of chemical bonding force to the total interfacial bonding force, with the unit being 1;

[0140] a and b are exponential constants with the unit being 1;

[0141] k is the adjustment coefficient, the unit is mm -1 ;

[0142] c is the adjustment coefficient, the unit is 1×10 6 mm 2 / kg.

[0143] Then, the coating amount of high-strength interface agent is 0.8~1.2kg / m 2 .

[0144] Calculated by weight, the high-strength interface agent consists of the following components: a condensation product consisting of 55-65 parts of polyhydroxy epoxy resin, 10-15 parts of isocyanate polyurethane, 5-12 parts of unsaturated polyester and 16-28 parts of amide amine curing agent.

[0145] In some preferred embodiments, the unsaturated polyester is prepared by a polycondensation reaction of maleic anhydride, maleic acid, phthalic anhydride, and a styrene crosslinker, and has an acidity of 40 to 60 mg KOH / g; the mass ratio of maleic anhydride, maleic acid, phthalic anhydride, and styrene crosslinker is 2:3:4:1, and the temperature of the polycondensation reaction is controlled at 180 to 220° C.; the amide curing agent is obtained by a polycondensation reaction of diglycidyl ester and diethylenetriamine, and has an amine value of 220 to 380 mg KOH / g.

[0146] This specific embodiment also provides a construction method of an ultra-tough cement seamless splicing structure, which specifically includes the following steps:

[0147] S1, remove the excess pavement cushion layer 2 on the base layer 1 at the construction location of the super-tough cement structure 3, and set a wedge-shaped groove 7;

[0148] S2, setting roughened concave and convex surfaces at the construction positions of the super-tough cement structure 3 of the pavement cushion layer 2 and the base layer 1;

[0149] S3, install the filling sealing strip 5 at the deformation joint position;

[0150] S4, installing a prestressed door reinforcement frame at the construction location of the super-tough cement structure 3;

[0151] S5. Apply a high-strength interface agent on the surface of the roughened concave and convex surface;

[0152] S6. Prepare ultra-tough cement structural materials, pour the ultra-tough cement structural materials at the construction location of ultra-tough cement structure 3, and vibrate and level them;

[0153] S7. After the super-tough cement structural material has initially set, smooth the surface and lay the paving surface layer 4 after curing.

[0154] In some preferred embodiments, a construction method of super-tough cement structure prefabrication + on-site assembly can also be used, specifically including:

[0155] S1. Select modules and assemble them according to the actual needs of the site. The prefabricated ultra-tough cement structure 3 modules are 0.5-4m long, with a stepped cross-section that is wide at the top and narrow at the bottom. The two sides protrude downward to form a wedge-shaped buckle. The upper and lower widths are 1-3cm smaller than the width of the splicing position, as shown in Figure 3.

[0156] S2. Install prestressed reinforcement frames, including inverted Ω-shaped curved reinforcement bars 81 and inverted U-embedded reinforcement bars 82. The reinforcement diameter is 12-32 mm. The height of the inverted Ω-shaped curved reinforcement bars 81 is 150-250 mm. The bottom surface is 50-150 mm from the foundation layer. The prestressed tension is set at 2-12 MPa. The ultra-tough cement structure 3 is prefabricated in the factory, and corresponding U-shaped reinforcement holes 31 and transverse anchorage holes 32 are reserved.

[0157] S3. Reserve wedge-shaped slots at the on-site splicing locations and clear any debris. The step height should be 150-200mm, the step width 250-350mm, the slot width at the top 100-200mm, the bottom 50-100mm, the depth 50-80mm, the length 300-900mm, and the spacing 300-600mm.

[0158] S4. After the prefabricated super-tough cement structural components have reached 80% of the design strength, as shown in FIG4 , high-strength interface agent and super-tough cement are injected successively along the inverted U-shaped reinforcement holes 31 and the transverse anchorage reinforcement holes 32 according to the fixed position of the reserved wedge-shaped slots 7, thereby saving on-site construction time of the pavement and taking into account the convenience of later maintenance, modular replacement is quick and efficient.

[0159] Example 1: A super-tough cement seamless splicing structure and its construction method

[0160] As shown in Figure 1, from bottom to top, it includes a base layer 1, a pavement cushion layer 2 and a paving surface layer 4; wherein, the pavement cushion layer 2 includes a spliced ​​super-tough cement structure 3, and the super-tough cement structure 3 is connected to the pavement cushion layer 2 and the base layer 1 through a rough rubber surface 6; the splicing interface between the super-tough cement structure 3 and the pavement cushion layer 2 is provided with a wedge-shaped card groove 7, which is used to limit and fix the super-tough cement structure 3 and the pavement cushion layer 2; a filling sealing strip 5 is also provided at the splicing seam position between the base layer 1 and the pavement cushion layer 2.

[0161] Among them, the width of the super-tough cement structure 3 is 900mm, the cross-section of the wedge-shaped slot 7 is an inverted trapezoid, the upper width is 120mm, the lower width is 60mm, the depth is 50mm, the length is 400mm, the spacing is 400mm, the step height is 150mm, and the step width is 270mm; the filling sealing strip 5 is a circle with a diameter of 12mm, the surface is flush with the base layer 1, and the material is rubber.

[0162] As shown in Figure 1, in the super-tough cement structure 3, prestressed portal frame reinforcement is also arranged along the length direction. The prestressed portal frame reinforcement includes an inverted Ω curved stress reinforcement 81, two inverted U embedded reinforcements 82 and two splicing surface transverse anchor reinforcements 83. The middle convex part of the inverted U embedded reinforcement 82 is connected to the concave part of the inverted Ω curved stress reinforcement 81, and the two end parts of the inverted Ω curved stress reinforcement 81 are respectively overlapped with one end of the two splicing surface transverse anchor reinforcements 83. The height of the end part of the inverted Ω curved stress reinforcement 81 is higher than the height of the splicing surface transverse anchor reinforcement 83.

[0163] The diameter of the prestressed portal frame reinforcement is 12 mm, the height of the inverted Ω bent reinforcement 81 is 150 mm, the distance between the bottom surface of the prestressed portal frame reinforcement and the foundation layer 1 is 80 mm, and the prestressed tension of the prestressed portal frame reinforcement is set to 6 MPa.

[0164] In this embodiment, the width of the super-tough cement structure 3 and the elongation of the super-tough cement structure material satisfy the following relationship: ,

[0165] in, is the elongation of super-tough cement structural material, the unit is 1;

[0166] L is the width of the super-tough cement structure 3, in mm;

[0167] f is the adjustment coefficient, the unit is mm -1 , the value is 1.

[0168] In this embodiment, the elongation of the super-tough cement structural material is: 0.75.

[0169] According to the relationship: The calculated weight ratio of composite fiber and shrinkage reducing admixture is 12.8.

[0170] in, is the elongation of super-tough cement structural material, the unit is 1;

[0171] p and q are adjustment coefficients, in g -1 , the value is 1;

[0172] m1 is the amount of composite fiber added, in g;

[0173] m2 is the amount of shrinkage reducing admixture added, the unit is g.

[0174] Therefore, calculated by weight, the specific components of the ultra-tough cement structural material used in this embodiment are as follows: 65 parts of cement, 28 parts of quartz sand powder, 10 parts of fly ash, 6 parts of steel slag powder, 13 parts of ultrafine calcium carbonate with a particle size of 200 nm, 16 parts of polyethylene fiber, 1.25 parts of shrinkage reducing admixture and 4 parts of water, wherein the shrinkage reducing admixture is a mixture of magnesium oxide expansion agent and polycarboxylic acid water reducer, and the weight ratio of magnesium oxide expansion agent to polycarboxylic acid water reducer is: 3.

[0175] In this embodiment, the rough rubber surface 6 also includes a chiseled concave-convex surface and a high-strength interface layer coated on the chiseled concave-convex surface. The roughness of the chiseled concave-convex surface is 6 mm, and the aggregate exposure rate accounts for 30% of the maximum particle size. The roughness of the chiseled concave-convex surface and the coating amount of the high-strength interface agent of the high-strength interface layer satisfy the following relationship:

[0176] ;

[0177] Where A is the ratio of the interface bite force to the interface connection force, and the unit is 1;

[0178] h is the roughness, reflecting the height difference between the concave and convex parts of the interface, and the unit is mm;

[0179] w is the coating amount of high-strength interface agent, the unit is kg / m 2 ;

[0180] B is the ratio of chemical bonding force to the total interfacial bonding force, with the unit being 1;

[0181] a and b are exponential constants with the unit being 1;

[0182] k is the adjustment coefficient, the unit is mm -1 ;

[0183] c is the adjustment coefficient, the unit is 1×10 6 mm 2 / kg.

[0184] The coating amount of high-strength interface agent is: 0.95kg / m 2 .

[0185] Calculated by weight, the high-strength interface agent includes the following components: 58 parts of polyhydroxy epoxy resin, 12 parts of isocyanate polyurethane, 8 parts of unsaturated polyester and 22 parts of amide amine curing agent; wherein, the unsaturated polyester is prepared by polycondensation reaction of maleic anhydride, maleic acid, phthalic anhydride and styrene crosslinker in a mass ratio of 2:3:4:1, the temperature of the polycondensation reaction is controlled at 195°C, and the acidity of the unsaturated polyester is 46 mg KOH / g; the amide curing agent is obtained by polycondensation reaction of diglycidyl ester and diethylenetriamine, and the amine value of the amide curing agent is 268 mg KOH / g.

[0186] This embodiment also provides a construction method of an ultra-tough cement seamless splicing structure, which specifically includes the following steps:

[0187] S1. Remove the excess cushion layer at the super-tough cement joint and set staggered wedge-shaped slots 7;

[0188] S2. Lay a rough rubber surface 6 on the connection surface between the pavement cushion layer 2, the base layer 1 and the super-tough cement structure 3. The roughness of the roughened concave and convex surface is 5-10 mm. The treated area is ≥ 90%, and 1 / 3 of the aggregate is exposed and the residual particles are cleaned;

[0189] S3. Install the filling sealing strip 5 at the deformation joint, with the surface flush with the base layer 1;

[0190] S4, install the prestressed reinforcement frame 8, including the inverted Ω bent reinforcement 81, two inverted U embedded reinforcements 82 and two splicing surface transverse anchor reinforcements 83;

[0191] S5. Prepare a high-strength interface agent according to the above scheme and apply it on the roughened concave and convex surface, controlling the coating amount to 0.95kg / m 2 ;

[0192] S6. Prepare the super-tough cement structural material according to the above scheme, pour it evenly, and after vibrating and leveling, finish and plaster the surface after initial setting, and spray water mist for moisturizing maintenance in a timely manner;

[0193] After S7 and 7 days, the surface layer 4 can be applied.

[0194] Example 2: A super-tough cement seamless splicing structure and its construction method

[0195] A super-tough cement seamless splicing structure and construction method thereof

[0196] As shown in Figure 1, from bottom to top, it includes a base layer 1, a pavement cushion layer 2 and a paving surface layer 4; wherein, the pavement cushion layer 2 includes a spliced ​​super-tough cement structure 3, and the super-tough cement structure 3 is connected to the pavement cushion layer 2 and the base layer 1 through a rough rubber surface 6; the splicing interface between the super-tough cement structure 3 and the pavement cushion layer 2 is provided with a wedge-shaped card groove 7, which is used to limit and fix the super-tough cement structure 3 and the pavement cushion layer 2; a filling sealing strip 5 is also provided at the splicing seam position between the base layer 1 and the pavement cushion layer 2.

[0197] Among them, the width of the super-tough cement structure 3 is 1600mm, the cross-section of the wedge-shaped slot 7 is an inverted trapezoid, the upper width is 180mm, the lower width is 90mm, the depth is 75mm, the length is 800mm, the spacing is 450mm, the step height is 180mm, and the step surface is 320mm; the filling sealing strip 5 is a circle with a diameter of 18mm, the surface is flush with the base layer 1, and the material is rubber.

[0198] As shown in Figure 1, in the super-tough cement structure 3, prestressed portal frame reinforcement is also arranged along the length direction. The prestressed portal frame reinforcement includes an inverted Ω curved stress reinforcement 81, two inverted U embedded reinforcements 82 and two splicing surface transverse anchor reinforcements 83. The middle convex part of the inverted U embedded reinforcement 82 is connected to the concave part of the inverted Ω curved stress reinforcement 81, and the two end parts of the inverted Ω curved stress reinforcement 81 are respectively overlapped with one end of the two splicing surface transverse anchor reinforcements 83. The height of the end part of the inverted Ω curved stress reinforcement 81 is higher than the height of the splicing surface transverse anchor reinforcement 83.

[0199] The diameter of the prestressed portal frame reinforcement is 18 mm, the height of the inverted Ω bent reinforcement 81 is 220 mm, the distance between the bottom surface of the prestressed portal frame reinforcement and the foundation layer 1 is 120 mm, and the prestressed tension of the prestressed portal frame reinforcement is set to 10 MPa.

[0200] In this embodiment, the width of the super-tough cement structure 3 and the elongation of the super-tough cement structure material satisfy the following relationship: ,

[0201] in, is the elongation of super-tough cement structural material, the unit is 1;

[0202] L is the width of the super-tough cement structure 3, in mm;

[0203] f is the adjustment coefficient, the unit is mm -1 , the value is 1.

[0204] In this embodiment, the elongation of the super-tough cement structural material is: 0.5.

[0205] According to the formula The calculated ratio of the added amount of composite fiber and shrinkage reducing admixture is: 10.9.

[0206] in, is the elongation of super-tough cement structural material, the unit is 1;

[0207] p and q are adjustment coefficients, in g -1 ;

[0208] m1 is the amount of composite fiber added, in g;

[0209] m2 is the amount of shrinkage reducing admixture added, the unit is g.

[0210] Therefore, calculated by weight, the specific components of the ultra-tough cement structural material used in this embodiment are as follows: 65 parts of cement, 25 parts of quartz sand powder, 12 parts of fly ash, 8 parts of steel slag powder, 16 parts of ultrafine calcium carbonate with a particle size of 200 nm, 21.8 parts of polyethylene fiber, 2 parts of shrinkage reducing admixture and 4 parts of water; wherein, the shrinkage reducing admixture is a mixture of magnesium oxide expansion agent and polycarboxylic acid water reducer, and the weight ratio of magnesium oxide expansion agent to polycarboxylic acid water reducer is: 2.5.

[0211] In this embodiment, the rough rubber surface 6 also includes a chiseled concave-convex surface and a high-strength interface layer coated on the chiseled concave-convex surface. The roughness of the chiseled concave-convex surface is 6 mm, and the aggregate exposure rate accounts for 33% of the maximum particle size. The roughness of the chiseled concave-convex surface and the coating amount of the high-strength interface agent of the high-strength interface layer satisfy the following relationship:

[0212] ;

[0213] Where A is the ratio of the interface bite force to the interface connection force, and the unit is 1;

[0214] h is the roughness, reflecting the height difference between the concave and convex parts of the interface, and the unit is mm;

[0215] w is the coating amount of high-strength interface agent, the unit is kg / m 2 ;

[0216] B is the ratio of chemical bonding force to the total interfacial bonding force, with the unit being 1;

[0217] a and b are exponential constants with the unit being 1;

[0218] k is the adjustment coefficient, the unit is mm -1 ;

[0219] c is the adjustment coefficient, the unit is 1×10 6 mm 2 / kg.

[0220] The coating amount of high-strength interface agent is: 1.1kg / m 2 .

[0221] Calculated by weight, the high-strength interface agent includes the following components: 62 parts of polyhydroxy epoxy resin, 14 parts of isocyanate polyurethane, 8 parts of unsaturated polyester and 25 parts of amide amine curing agent; wherein, the unsaturated polyester is prepared by polycondensation reaction of maleic anhydride, maleic acid, phthalic anhydride and styrene crosslinker in a mass ratio of 2:3:4:1, the temperature of the polycondensation reaction is controlled at 205°C, and the acidity of the unsaturated polyester is 45 mg KOH / g; the amide curing agent is obtained by polycondensation reaction of diglycidyl ester and diethylenetriamine, and the amine value of the amide curing agent is 380 mg KOH / g.

[0222] This embodiment also provides a construction method for an ultra-tough cement seamless splicing structure, specifically, prefabricating the ultra-tough cement seamless splicing structure and assembling it on site, specifically including:

[0223] S1. Select modules and assemble them according to the actual needs of the site. The prefabricated super-tough cement structure module is 2 meters long and has a stepped cross-section with a wide top and narrow bottom. The two sides protrude downward to form a wedge-shaped buckle, as shown in Figure 3. The upper and lower widths are 2 cm smaller than the width of the splicing position.

[0224] S2. Install prestressed reinforcement frames, including curved reinforcement and portal frame embedded reinforcement. The reinforcement diameter is 18 mm, the curved reinforcement is inverted Ω shape, 200 mm high, and the bottom surface is 100 mm from the foundation layer. The prestressed tension is set to 10 MPa. The ultra-tough cement structure is prefabricated in the factory, and corresponding U-shaped reinforcement holes and transverse anchorage holes are reserved.

[0225] S3. Reserve wedge-shaped slots at the on-site splicing locations and clear any debris inside. As shown in Figure 4, the step height is 180mm, the step width is 300mm, the slots have an upper width of 150mm, a lower width of 80mm, a depth of 60mm, a length of 800mm, and a spacing of 500mm.

[0226] S4. After the prefabricated super-tough cement structural component reaches 80% of the design strength, high-strength interface agent and super-tough cement structural material are injected successively along the inverted U-shaped rib hole 31 and the transverse anchor rib hole 32 according to the fixed position of the reserved wedge-shaped slot 7.

[0227] Comparative Example 1: A seamless splicing structure and its construction method

[0228] The ultra-tough cement seamless splicing structure of this comparative example is the same as that of Example 1, and the construction method of the seamless splicing structure is the same as that of Example 1, except that:

[0229] In this comparative example, the relationship between the width of the super-tough cement structure 3 and the elongation of the super-tough cement structure material is not used:

[0230] Calculate the elongation of super-tough cement structural materials. The elongation of super-tough cement structural materials is directly 0.3%. According to the relationship:

[0231] The calculated ratio of the added amount of composite fiber and shrinkage reducing admixture is: 18.2.

[0232] in, is the elongation of super-tough cement structural material, the unit is 1;

[0233] p and q are adjustment coefficients, in g -1 , all values ​​are 1;

[0234] m1 is the amount of composite fiber added, in g;

[0235] m2 is the amount of shrinkage reducing admixture added, the unit is g.

[0236] Therefore, the specific components of the super-tough cement structural material used in this comparative example are as follows: 65 parts of cement, 28 parts of quartz sand powder, 10 parts of fly ash, 10 parts of steel slag powder, 13 parts of ultrafine calcium carbonate with a particle size of 200 nm, 31.85 parts of polyethylene fiber, 1.75 parts of shrinkage reducing admixture and 4 parts of water, wherein the weight ratio of magnesium oxide expansion agent and polycarboxylic acid water reducer is: 3.

[0237] The other component material formulas of this comparative example are the same as those in Example 1.

[0238] Comparative Example 2: A seamless splicing structure and its construction method

[0239] The ultra-tough cement seamless splicing structure of this comparative example is the same as that of Example 1, and the construction method of the seamless splicing structure is the same as that of Example 1, except that:

[0240] In this comparative example, the relationship between the width of the super-tough cement structure 3 and the elongation of the super-tough cement structure material is not used: Calculate the elongation of super-tough cement structural materials. The elongation of super-tough cement structural materials directly adopts 3%. According to the relationship: The calculated ratio of the added amount of composite fiber and shrinkage reducing admixture is: 4.8.

[0241] in, is the elongation of super-tough cement structural material, the unit is 1;

[0242] p and q are adjustment coefficients, in g -1 ;

[0243] m1 is the amount of composite fiber added, in g;

[0244] m2 is the amount of shrinkage reducing admixture added, the unit is g.

[0245] Therefore, the specific components of the ultra-tough cement structural material used in this comparative example are as follows: 65 parts of cement, 28 parts of quartz sand powder, 10 parts of fly ash, 10 parts of steel slag powder, 13 parts of ultrafine calcium carbonate with a particle size of 200 nm, 16 parts of polyethylene fiber, 4.8 parts of shrinkage reducing admixture and 3-5 parts of water, wherein the weight ratio of magnesium oxide expansion agent and polycarboxylic acid water reducer is: 3.

[0246] The other component material formulas of this comparative example are the same as those in Example 1.

[0247] Comparative Example 3: A seamless splicing structure and its construction method

[0248] The cement seamless splicing structure of this comparative example is the same as that of Example 1, and the construction method of the seamless splicing structure is the same as that of Example 1, except that:

[0249] In this comparative example, the roughness of the chiseled concave and convex surface is selected to be 20mm, and the aggregate exposure rate accounts for 40% of the maximum particle size. The relationship formula is not used. Adjust the coating amount of high-strength interface agent.

[0250] The other component material formulas of this comparative example are the same as those in Example 1.

[0251] Comparative Example 4: A seamless splicing structure and its construction method

[0252] The cement seamless splicing structure of this comparative example is the same as that of Example 1, and the construction method of the seamless splicing structure is the same as that of Example 1, except that:

[0253] In this comparative example, the roughness of the chiseled concave and convex surface is selected to be 3mm, and the aggregate exposure rate accounts for 15% of the maximum particle size. The relationship formula is not used. Adjust the coating amount of high-strength interface agent.

[0254] The other component material formulas of this comparative example are the same as those in Example 1.

[0255] Performance Testing

[0256] The durability and other properties of the seamless splicing structures of Examples 1 to 2 and Comparative Examples 1 to 4 were tested. The test method was as follows: by fixing both sides of the ultra-tough cement seamless splicing structure, with a loading rate of 0.05 mm / s, a controlled displacement of 40 mm, and loading 5000 times as the target, the tensile strength and fatigue performance were tested. The test results are shown in the following table.

[0257] Table 1. Performance test results

[0258]

[0259] According to the comparison of the test results of Comparative Examples 1 and 2 with Example 1, when the relationship provided by the present invention is not adopted and the elongation of the super-tough cement structure material is limited by the width of the super-tough cement structure, the obtained seamless splicing structure exhibits slippage, cracking and other phenomena.

[0260] According to the comparison of the test results of Comparative Example 3 and Example 1, it can be seen that when the relationship provided by the present invention is not used to adjust the coating amount of the high-strength interface agent, increasing the roughness of the roughened concave and convex surface and then increasing the aggregate exposure rate will cause some aggregates to be covered by cement for less than 50%, resulting in insufficient embedding force and causing the aggregate to loosen.

[0261] According to the comparison of the test results of Comparative Example 4 and Example 1, when the coating amount of the high-strength interface agent is not adjusted by the relationship provided by the present invention, the roughness of the roughened concave and convex surface is too small, resulting in incomplete removal of the floating slurry and insufficient bite force formed by the concave and convex difference.

[0262] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been presented as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A super-tough cement seamless splicing structure, characterized in that: From bottom to top, it includes a base layer, a pavement cushion layer, and a paving surface layer; wherein the pavement cushion layer includes a spliced ultra-tough cement structure, and the ultra-tough cement structure is connected to the pavement cushion layer and the base layer through a rough rubber surface; the width of the ultra-tough cement structure and the elongation of the ultra-tough cement structure material satisfy the following relationship: ， in, is the elongation of super-tough cement structural material, the unit is 1; L is the width of the super-tough cement structure, in mm; f is the adjustment coefficient, the unit is mm -1 .

2. The ultra-tough cement seamless splicing structure according to claim 1, characterized in that: Calculated by weight, the ultra-tough cement structural material includes the following components: 65-70 parts of dry mix, 10-18 parts of nano active powder, 14-22 parts of composite fiber, 1-2 parts of shrinkage reducing admixture and 3-5 parts of water.

3. The ultra-tough cement seamless splicing structure according to claim 2, characterized in that: The addition amounts of the composite fiber and the shrinkage-reducing admixture satisfy the following relationship: ; in, is the elongation of super-tough cement structural material, the unit is 1; p and q are adjustment coefficients, in g -1 ; m1 is the amount of composite fiber added, in g; m2 is the amount of shrinkage reducing admixture added, the unit is g.

4. The super-tough cement seamless splicing structure according to claim 1, characterized in that: A wedge-shaped slot is provided at the splicing interface between the super-tough cement structure and the pavement cushion layer, which is used to limit and fix the super-tough cement structure and the pavement cushion layer.

5. The super-tough cement seamless splicing structure according to claim 1, characterized in that: A filling sealing strip is provided at the deformation joint between the base layer and the pavement cushion layer.

6. The ultra-tough cement seamless splicing structure according to any one of claims 1 to 5, characterized in that: In the super-tough cement structure, prestressed portal frame reinforcement is provided along the length direction of the super-tough cement structure; The prestressed portal frame reinforcement includes an inverted Ω bent stress reinforcement, at least one inverted U embedded reinforcement and at least one splicing surface transverse anchor reinforcement; The middle raised portion of the inverted U embedded reinforcement is connected to the concave portion of the inverted Ω bent reinforcement, the end portion of the inverted Ω bent reinforcement overlaps one end of the transverse anchor reinforcement of the splicing surface, and the height of the end portion of the inverted Ω bent reinforcement is higher than the height of the transverse anchor reinforcement of the splicing surface.

7. The ultra-tough cement seamless splicing structure according to claim 1, characterized in that: The rough rubber surface comprises a chiseled concave-convex surface and a high-strength interface layer coated on the chiseled concave-convex surface, and the chiseled concave-convex surface is formed by milling the original road surface.

8. The super-tough cement seamless splicing structure according to claim 7, characterized in that: The roughness of the chiseled concave-convex surface and the coating amount of the high-strength interface agent used in the high-strength interface layer satisfy the following relationship: ； Where A is the ratio of the interface bite force to the interface connection force, and the unit is 1; h is the roughness, reflecting the height difference between the concave and convex parts of the interface, and the unit is mm; w is the coating amount of high-strength interface agent, the unit is kg / m 2 ; B is the ratio of chemical bonding force to the total interfacial bonding force, with the unit being 1; a and b are exponential constants with the unit being 1; k is the adjustment coefficient, the unit is mm -1 ; c is the adjustment coefficient, the unit is 1×10 6 mm 2 / kg.

9. The super-tough cement seamless splicing structure according to claim 8, characterized in that: The high-strength interface agent is a condensation product prepared by the following components in parts by weight: 55-65 parts of polyhydroxy epoxy resin, 10-15 parts of isocyanate polyurethane, 5-12 parts of unsaturated polyester and 16-28 parts of amidoamine curing agent; the coating amount of the high-strength interface agent is 0.8-1.2 kg / m 2 .

10. The construction method of the super-tough cement seamless splicing structure according to any one of claims 1 to 9, characterized in that: The steps include: S1. Clear the construction site of the super-tough cement structure, the excess pavement cushion on the foundation layer, and set a wedge-shaped slot; S2. Setting roughened concave and convex surfaces at the construction locations of the super-tough cement structure of the pavement cushion layer and the base layer; S3. Install filling sealing strips at the expansion joints; S4. Install prestressed door reinforcement frames at the construction location of the super-tough cement structure; S5. Apply a high-strength interface agent on the surface of the roughened concave and convex surface; S6. Prepare super-tough cement structural materials, pour the super-tough cement structural materials at the construction location of the super-tough cement structure, and vibrate and level them; S7. After the super-tough cement structural material has initially solidified, smooth the surface and lay the paving surface after curing.

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