A PK board and its preparation method

Abstract

The present invention discloses a PK board and a preparation method thereof, belonging to the field of building materials. The PK board includes a base board and a plurality of high-strength prestressed steel bars arranged and fixed in the base board. Laminated boards are integrally formed on both the upper and lower layers of the base board. A plurality of grouting trusses are arranged above the upper laminated board. A plurality of connecting feet are welded and fixed on the grouting trusses. Part of the connecting feet are buried and fixed in the upper laminated board, and a plurality of through holes are formed in the part of the connecting feet buried in the upper laminated board. For the PK board prepared by the present invention, the connecting feet of the grouting trusses are designed in a "J" shape, and a plurality of through holes are formed in the part of the connecting feet buried inside the laminated board, so that a plurality of cross-shaped connection points are formed between the connecting feet and the laminated board. At the same time, the "J" shape can also be hooked with the laminated board, so that the grouting truss can be firmly fixed on the PK board.

Description

Technical Field

[0001] The present invention relates to building materials, and particularly to a PK board and a preparation method thereof. Background Art

[0002] The PK board is a prestressed concrete composite slab, which has the characteristics of light weight, large stiffness, high load-bearing capacity, good crack resistance, etc. And because the PK board is manufactured in a factory and produced on a large scale, there is no need to lay formwork during the construction stage, which can effectively save wooden formwork and supports, shorten the construction period, and reduce the cost. Therefore, it is widely used in the engineering construction industry. However, during the manufacturing process of the traditional PK board, the connection node design between the grouting truss and the concrete is relatively complex, which increases the manufacturing difficulty and cost. And the traditional PK board is directly cast with C50 concrete. At the same time, in order to ensure the characteristics of easy transportation and construction of the PK board, its thickness is relatively thin, which results in general waterproof and heat insulation effects of the traditional PK board. During the later construction process, additional construction operations are required, such as fixing waterproof and heat insulation boards on the outside of the PK board to ensure the waterproof and heat insulation effects of the building, which is likely to lead to a longer construction period. Summary of the Invention

[0003] Object of the Invention: The object of the present invention is to provide a PK board; another object of the present invention is to provide a preparation method of a PK board.

[0004] Technical Solution: A PK board includes a base plate and a plurality of high-strength prestressed steel bars arranged and fixed in the base plate. Composite slabs are integrally formed on both the upper and lower layers of the base plate. A plurality of grouting trusses are arranged above the upper composite slab. A plurality of connecting feet are welded and fixed on the grouting trusses. Part of the connecting feet is buried and fixed in the upper composite slab, and a plurality of through holes are formed in the part of the connecting feet buried in the upper composite slab.

[0005] Preferably, the connecting feet are in a "J" - shaped structure, and the through holes are formed in the area outside the inflection point of the connecting feet.

[0006] Preferably, a plurality of channels are formed on the base plate. The channels and the high-strength prestressed steel bars are distributed at intervals, and rib plates are filled in the channels. The rib plates are integrally formed with the upper and lower composite slabs.

[0007] Preferably, the upper and lower composite slabs and the rib plates are integrally cast and formed with the same molding material. The molding material includes cement, lignosulfonic acid formaldehyde condensate, silica, fly ash, aggregate, calcium silicate, and magnesium oxide.

[0008] Preferably, the molding material specifically comprises 70-90 parts by weight of cement, 8-12 parts by weight of lignosulfonic acid formaldehyde condensate, 10-15 parts by weight of silicon dioxide, 10-15 parts by weight of fly ash, 20-30 parts by weight of aggregate, 5-9 parts by weight of calcium silicate, and 7-10 parts by weight of magnesium oxide; the preparation process of the molding material is as follows: the above-mentioned parts by weight of cement, lignosulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate, and magnesium oxide are mechanically mixed evenly to obtain the molding material.

[0009] Preferably, the aggregate is a mixture of coarse aggregate and fine aggregate in a weight ratio of 2-5:1-3.

[0010] Preferably, the coarse aggregate is pebbles with a particle size of 4-8 mm, and the fine aggregate is crushed stones with a particle size of 1-3 mm.

[0011] A preparation method of a PK board comprises the following steps:

[0012] S1. According to the design requirements, put the steel bars into the mold, and then comb and arrange the steel bars.

[0013] S2. Carry out prestress tensioning on the steel bars that have been combed and arranged, so that the steel bars reach the prestress value required by the design.

[0014] S3. Uniformly arrange C50 concrete in the mold to ensure that the concrete wraps the steel bars and fills them densely.

[0015] S4. After the C50 concrete dries to a certain extent, carry out roughening treatment on the C50 concrete.

[0016] S5. After the C50 concrete is completely dry, form a base plate, then open a through channel on the base plate, and demold.

[0017] S6. Put the base plate in step S5 into another mold, make the two sides of the mold clamp the base plate, so that there is a certain gap between the base plate and the bottom of the mold, and place a plurality of grouting trusses with connecting feet equidistantly above the base plate.

[0018] S7. Add water to the molding material, and fully stir to form mortar, then add methanol and trichlorosilane to the mortar, stir and mix again, and pour it into the mold and fill it densely.

[0019] S8. After standing for a period of time until the mortar solidifies to form a laminated plate on the upper and lower sides of the base plate, demold to obtain the PK board.

[0020] Preferably, in step S7, material: water (W / W) = 1:3-4; methanol: trichlorosilane (W / W) = 1-3:2-5. Beneficial effects

[0021] (1)For the PK board prepared by the present invention, the connecting feet of the grouting truss are designed in a "J" shape, and a plurality of through holes are opened in the part of the connecting feet buried inside the composite slab, so as to form a plurality of cross-shaped connection points between the connecting feet and the composite slab. At the same time, the "J" shape structure can also be hooked with the composite slab, so that the grouting truss can be firmly fixed on the PK board. Compared with the complex node design between the traditional PK complex grouting truss and concrete, the connection design between the grouting truss of the PK board prepared by the present invention and the PK board is simpler.

[0022] (2)For the PK board prepared by the present invention, the rib plates are hidden inside the base plate, and the rib plates and the high-strength prestressed steel bars inside the base plate are distributed at intervals, so as to form a criss-cross grid structure inside the base plate, and thus the load-bearing capacity of the PK can be stronger. At the same time, compared with the way of directly casting the rib plates on the outside of the base plate, the rib plates hidden inside the base plate can ignore the height limit of the rib plates, so that the base plates of different thicknesses can be cast according to the design requirements to improve the flexural load-bearing capacity of the PK board.

[0023] (3)For the PK board prepared by the present invention, composite slabs are integrally formed on the upper and lower layers of the base plate, and the composite slabs are made of the forming materials prepared by the present invention. Methanol and trichlorosilane in the materials will generate methyl silicate inside the materials, thereby increasing the waterproof performance of the materials. And fly ash in the materials can undergo a secondary hydration reaction with calcium hydroxide in the cement, so as to fill the voids and further increase the water resistance of the materials. And calcium silicate and magnesium oxide in the materials can increase the heat preservation performance of the materials. Compared with the traditional PK board, the PK board prepared by the present invention has good waterproof and heat preservation performance.

[0024] (4)The composite slabs in the PK board prepared by the present invention are located on the upper and lower layers of the base plate and are integrally formed with the rib plates in the base plate. The upper and lower layer composite slabs and the rib plates form an I-shaped structure, which can avoid the situation of loose connection and delamination between the composite slab and the base plate. Description of the Drawings

[0025] Figure 1 is the structural schematic diagram of PK;

[0026] Figure 2 is the A-A sectional view of the PK board;

[0027] In the figure: 1, base plate; 2, grouting truss; 3, connecting foot; 4, composite slab; 5, high-strength prestressed steel bar; 6, channel; 7, through hole; 8, rib plate. Detailed Embodiments

[0028] To make the technical solutions of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments. Embodiment

[0029] As shown Figure 1-2 in the figure, a PK board includes a substrate 1 and a number of high-strength prestressed steel bars 5 arranged and fixed in the substrate 1. Laminated plates 4 are integrally formed on both the upper and lower layers of the substrate 1. A plurality of channels 6 are opened on the substrate 1, and rib plates 8 are filled inside the channels 6. The rib plates 8 are integrally cast with the upper and lower laminated plates 4. A plurality of grouting trusses 2 are arranged above the upper laminated plate 4. A plurality of "J"-shaped connecting feet 3 are welded and fixed on the grouting trusses 2. Part of the connecting feet 3 are buried and fixed in the upper laminated plate 4, and a plurality of through holes 7 are opened on the part of the connecting feet 3 buried outside the inflection points of the upper laminated plate 4.

[0030] Among them, the upper and lower laminated plates 4 and the rib plates 8 are all made of the same molding material. The molding material includes 70 parts of cement, 8 parts of lignosulfonic acid formaldehyde condensate, 10 parts of silicon dioxide, 10 parts of fly ash, 20 parts of aggregate (mixed by coarse and fine aggregates in a weight ratio of 2:1), 5 parts of calcium silicate, and 7 parts of magnesium oxide by weight. The molding material is obtained by mechanically mixing the above-mentioned parts of cement, lignosulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate and magnesium oxide evenly. The coarse aggregate is pebbles with a particle size of 4 mm, and the fine aggregate is crushed stones with a particle size of 1 mm.

[0031] The preparation method of the PK board is as follows:

[0032] (1), According to the design requirements, put the steel bars into the mold, and then comb and arrange the steel bars.

[0033] (2), Carry out prestress tensioning on the combed and arranged steel bars so that the steel bars reach the prestress required by the design.

[0034] (3), Uniformly arrange C50 concrete in the mold to ensure that the concrete wraps the steel bars and fills them densely.

[0035] (4), After the C50 concrete dries to a certain extent, carry out roughening treatment on the C50 concrete.

[0036] (5), After the C50 concrete is completely dried, form a substrate, then open through channels on the substrate and demold.

[0037] (6), Put the substrate in step S5 into another mold, make the two sides of the mold clamp the substrate, make a certain gap between the substrate and the bottom of the mold, and equidistantly place a plurality of grouting trusses with connecting feet above the substrate.

[0038] (7) Add water to the molding material, material: water (W / W) = 1:3, and stir thoroughly to form a mortar. Then add methanol and trichlorosilane to the mortar, methanol: trichlorosilane (W / W) = 1:2, stir again and pour into the mold and fill tightly.

[0039] (8) After the mortar solidifies on the upper and lower sides of the base plate to form a composite board, demoulding is performed to obtain a PK board. Example

[0040] like Figure 1-2 As shown, a PK plate comprises a base plate 1 and a plurality of high-strength prestressed steel bars 5 arranged and fixed in the base plate 1, the upper and lower layers of the base plate 1 are integrally formed with a composite plate 4, and a plurality of channels 6 are provided on the base plate 1, the interior of the channels 6 is filled with ribs 8, the ribs 8 are integrally cast with the upper and lower composite plates 4, a plurality of grouting trusses 2 are arranged above the upper composite plate 4, a plurality of "J"-shaped connecting legs 3 are welded and fixed on the grouting trusses 2, the connecting legs 3 are partially buried and fixed in the upper composite plate 4, and a plurality of through holes 7 are provided on the portion of the connecting legs 3 buried outside the inflection point of the upper composite plate 4.

[0041] The upper and lower laminated plates 4 and the ribs 8 are made of the same molding material, which includes 83 parts of cement, 11 parts of lignin sulfonic acid formaldehyde condensate, 15 parts of silicon dioxide, 10 parts of fly ash, 27 parts of aggregate (mixed by coarse and fine aggregates in a weight ratio of 3:2), 9 parts of calcium silicate, and 8 parts of magnesium oxide. The molding material is obtained by mechanically mixing the above parts of cement, lignin sulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate and magnesium oxide. The coarse aggregate is pebbles with a particle size of 7 mm, and the fine aggregate is crushed stone with a particle size of 2 mm.

[0042] The preparation method of the PK plate is as follows:

[0043] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0044] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0045] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps the steel bars and fills them densely.

[0046] (4) After the C50 concrete has dried to a certain degree, the surface of the C50 concrete is roughened.

[0047] (5) After the C50 concrete is completely dry, a base plate is formed, and then a through channel is opened on the base plate and demoulding is performed.

[0048] (6) Place the substrate in step S5 into another mold, such that both sides of the mold clamp the substrate, leaving a certain gap between the substrate and the bottom of the mold, and place multiple grouting trusses with connecting feet equidistantly above the substrate.

[0049] (7) Add water to the forming material, with the ratio of material: water (W / W) = 1:3. After thorough stirring, a mortar is formed. Then, add methanol and trichlorosilane to the mortar, with the ratio of methanol: trichlorosilane (W / W) = 2:3. After stirring and mixing again, pour it into the mold and fill it densely.

[0050] (8) After standing for a period of time until the mortar solidifies to form a laminated board on the upper and lower sides of the substrate, demold it to obtain the PK board. Example

[0051] As Figure 1-2 shown, a PK board includes a substrate 1 and several high-strength prestressed steel bars 5 arranged and fixed in the substrate 1. Laminated boards 4 are integrally formed on both the upper and lower layers of the substrate 1. Multiple channels 6 are opened on the substrate 1, and ribs 8 are filled inside the channels 6. The ribs 8 are integrally cast with the upper and lower laminated boards 4. Above the upper laminated board 4, multiple grouting trusses 2 are provided. Multiple "J"-shaped connecting feet 3 are welded and fixed on the grouting trusses 2. Part of the connecting feet 3 is buried and fixed in the upper laminated board 4, and multiple through holes 7 are opened on the part of the connecting feet 3 buried outside the inflection points of the upper laminated board 4.

[0052] Among them, the upper and lower laminated boards 4 and the ribs 8 are all made of the same forming material. The forming material includes 90 parts by weight of cement, 12 parts of lignosulfonic acid formaldehyde condensate, 15 parts of silicon dioxide, 15 parts of fly ash, 30 parts of aggregate (mixed by coarse and fine aggregates in a weight ratio of 5:3), 9 parts of calcium silicate, and 10 parts of magnesium oxide. The forming material is obtained by mechanically mixing the above-mentioned parts of cement, lignosulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate, and magnesium oxide evenly. The coarse aggregate is pebbles with a particle size of 8 mm, and the fine aggregate is crushed stones with a particle size of 3 mm.

[0053] The preparation method of this PK board is as follows:

[0054] (1) According to the design requirements, place the steel bars into the mold, and then comb and arrange the steel bars.

[0055] (2) Perform prestress tensioning on the combed and arranged steel bars, so that the steel bars reach the prestress required by the design.

[0056] (3) Uniformly arrange C50 concrete in the mold to ensure that the concrete wraps the steel bars and fills it densely.

[0057] (4) After the C50 concrete dries to a certain extent, roughen the C50 concrete surface.

[0058] (5) After the C50 concrete is completely dry, form a substrate, then create a through-channel on the substrate, and demold.

[0059] (6) Place the substrate from step S5 into another mold, let the two sides of the mold hold the substrate, leaving a certain gap between the substrate and the bottom of the mold, and equidistantly place multiple grouting trusses with connecting feet above the substrate.

[0060] (7) Add water to the forming material, with the ratio of material: water (W / W) = 1:4. After thorough mixing, form mortar. Then add methanol and trichlorosilane to the mortar, with the ratio of methanol: trichlorosilane (W / W) = 3:5. After mixing again, pour it into the mold and fill it densely.

[0061] (8) After standing for a period of time until the mortar solidifies to form a laminated slab on the upper and lower sides of the substrate, demold to obtain the PK slab.

[0062] As Figure 1-2 shown, a PK slab includes a substrate 1 and several high-strength prestressed steel bars 5 arranged and fixed in the substrate 1. Laminated slabs 4 are integrally formed on both the upper and lower layers of the substrate 1. Multiple channels 6 are opened on the substrate 1, and rib plates 8 are filled inside the channels 6. The rib plates 8 are integrally cast with the upper and lower laminated slabs 4. Above the upper laminated slab 4, multiple grouting trusses 2 are provided. Multiple "J"-shaped connecting feet 3 are welded and fixed on the grouting trusses 2. Part of the connecting feet 3 is buried and fixed in the upper laminated slab 4, and multiple through holes 7 are opened on the part of the connecting feet 3 buried outside the inflection points of the upper laminated slab 4.

[0063] Among them, the upper and lower laminated slabs 4 and the rib plates 8 are all made of the same forming material. This forming material includes 90 parts by weight of cement, 12 parts of lignosulfonic acid formaldehyde condensate, 15 parts of silica, 30 parts of aggregate (mixed by coarse and fine aggregates in a weight ratio of 5:3), 9 parts of calcium silicate, and 10 parts of magnesium oxide. This forming material is obtained by mechanically mixing the above-mentioned parts of cement, lignosulfonic acid formaldehyde condensate, silica, aggregate, calcium silicate, and magnesium oxide evenly. The coarse aggregate is pebbles with a particle size of 8 mm, and the fine aggregate is crushed stones with a particle size of 3 mm.

[0064] The preparation method of this PK slab is as follows:

[0065] (1) According to the design requirements, place the steel bars into the mold, and then comb and arrange the steel bars.

[0066] (2) Perform prestress tensioning on the combed and arranged steel bars so that the steel bars reach the prestress required by the design.

[0067] (3) Uniformly arrange C50 concrete in the mold to ensure that the concrete wraps the steel bars and is filled densely.

[0068] (4) After the C50 concrete dries to a certain extent, roughen the surface of the C50 concrete.

[0069] (5) After the C50 concrete is completely dry, form a substrate. Then, open a through-channel on the substrate and demold it.

[0070] (6) Place the substrate in step S5 into another mold, make the two sides of the mold clamp the substrate, so that there is a certain gap between the substrate and the bottom of the mold, and place multiple grouting trusses with connecting feet equidistantly above the substrate.

[0071] (7) Add water to the forming material, material: water (W / W) = 1:4, and stir well to form mortar. Then, add methanol and trichlorosilane to the mortar, methanol: trichlorosilane (W / W) = 3:5, and stir and mix again before pouring it into the mold and filling it densely.

[0072] (8) After standing for a period of time until the mortar solidifies to form a composite slab on the upper and lower sides of the substrate, demold it to obtain a PK slab.

[0073] As Figure 1-2 shown, a PK slab includes a substrate 1 and a number of high-strength prestressed steel bars 5 arranged and fixed in the substrate 1. Composite slabs 4 are integrally formed on both the upper and lower layers of the substrate 1, and a number of channels 6 are opened on the substrate 1. Rib plates 8 are filled inside the channels 6, and the rib plates 8 are integrally cast with the upper and lower composite slabs 4. A number of grouting trusses 2 are arranged above the upper composite slab 4, and a number of "J"-shaped connecting feet 3 are welded and fixed on the grouting trusses 2. Part of the connecting feet 3 are buried and fixed in the upper composite slab 4, and a number of through holes 7 are opened on the part of the connecting feet 3 buried outside the inflection points of the upper composite slab 4.

[0074] Among them, the upper and lower composite slabs 4 and the rib plates 8 are all made of the same forming material. The forming material includes 90 parts by weight of cement, 12 parts of lignosulfonic acid formaldehyde condensate, 15 parts of silicon dioxide, 15 parts of fly ash, 30 parts of aggregate (mixed by coarse and fine aggregates in a weight ratio of 5:3), 9 parts of calcium silicate, and 10 parts of magnesium oxide. The forming material is obtained by mechanically mixing the above-mentioned parts of cement, lignosulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate, and magnesium oxide evenly. The coarse aggregate is pebbles with a particle size of 8 mm, and the fine aggregate is crushed stones with a particle size of 3 mm.

[0075] The preparation method of the PK slab is as follows:

[0076] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0077] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0078] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps the steel bars and fills them densely.

[0079] (4) After the C50 concrete has dried to a certain degree, the surface of the C50 concrete is roughened.

[0080] (5) After the C50 concrete is completely dry, a base plate is formed, and then a through channel is opened on the base plate and demoulding is performed.

[0081] (6) Place the substrate in step S5 into another mold so that the two sides of the mold clamp the substrate, so that there is a certain gap between the substrate and the bottom of the mold, and place multiple grouting trusses with connecting legs equidistantly above the substrate.

[0082] (7) Add water to the molding material, material: water (W / W) = 1:4, and stir thoroughly to form mortar, then pour it into the mold and fill it tightly.

[0083] (8) After the mortar solidifies on the upper and lower sides of the base plate to form a composite board, demoulding is performed to obtain a PK board.

[0084] like Figure 1-2 As shown, a PK plate comprises a base plate 1 and a plurality of high-strength prestressed steel bars 5 arranged and fixed in the base plate 1, the upper and lower layers of the base plate 1 are integrally formed with a composite plate 4, and a plurality of channels 6 are provided on the base plate 1, the interior of the channels 6 is filled with ribs 8, the ribs 8 are integrally cast with the upper and lower composite plates 4, a plurality of grouting trusses 2 are arranged above the upper composite plate 4, a plurality of "J"-shaped connecting legs 3 are welded and fixed on the grouting trusses 2, the connecting legs 3 are partially buried and fixed in the upper composite plate 4, and a plurality of through holes 7 are provided on the portion of the connecting legs 3 buried outside the inflection point of the upper composite plate 4.

[0085] The upper and lower laminated plates 4 and the ribs 8 are made of the same molding material, which includes 90 parts of cement, 12 parts of lignin sulfonic acid formaldehyde condensate, 15 parts of silicon dioxide, 15 parts of fly ash, and 30 parts of aggregate (mixed by coarse and fine aggregates in a weight ratio of 5:3). The molding material is obtained by mixing the above parts of cement, lignin sulfonic acid formaldehyde condensate, silicon dioxide, fly ash, and aggregate uniformly. The coarse aggregate is pebbles with a particle size of 8 mm, and the fine aggregate is crushed stone with a particle size of 3 mm.

[0086] The preparation method of the PK plate is as follows:

[0087] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0088] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0089] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps the steel bars and fills them densely.

[0090] (4) After the C50 concrete has dried to a certain degree, the surface of the C50 concrete is roughened.

[0091] (5) After the C50 concrete is completely dry, a base plate is formed, and then a through channel is opened on the base plate and demoulding is performed.

[0092] (6) Place the substrate in step S5 into another mold so that the two sides of the mold clamp the substrate, so that there is a certain gap between the substrate and the bottom of the mold, and place multiple grouting trusses with connecting legs equidistantly above the substrate.

[0093] (7) Add water to the molding material, material: water (W / W) = 1:4, and stir thoroughly to form a mortar. Then add methanol and trichlorosilane to the mortar, methanol: trichlorosilane (W / W) = 3:5, stir again and pour into the mold and fill tightly.

[0094] (8) After the mortar solidifies on the upper and lower sides of the base plate to form a composite board, demoulding is performed to obtain a PK board.

[0095] The fourth generation PK plate is commercially available.

[0096] PK performance test:

[0097] ①, bearing capacity test: according to the JGJ / T70-2009 test standard, the bearing capacity of the PK boards of the same specifications (1.5m×2.0m×0.15m) of Examples 1 to 3 and Comparative Examples 1 to 4 was tested, and the test results are shown in Table 1.

[0098] Table 1 PK board load capacity

[0099]

[0100] It can be seen from Table 1 that the PK board prepared by the present invention has better bearing capacity and has a greater bearing weight than the traditional PK board.

[0101] ② Tensile property test: PK boards of the same specifications (1.5m × 2.0m × 0.15m) in Examples 1 - 3 and Comparative Examples 1 - 4 were successively fixed on the loading platform of the YM - 160T hydraulic machine. Then, steel wires were fixed on the grouting truss, and the other ends of the steel wires were fixed on the CLY - 10T tensiometer. The other end of the tensiometer was on the hydraulic column of the hydraulic press. The hydraulic press was started to retract the hydraulic column. After the upper laminated board cracked, the reading of the tensiometer was recorded, and the hydraulic press was shut down. The test results are shown in Table 2.

[0102] Table 2 Tensile capacity of PK board

[0103]

[0104] As can be seen from Table 2, the PK board prepared by the present invention has better tensile properties. And through the simple node design between the grouting truss and the PK board body, the grouting truss can be firmly connected and fixed to the PK board, so that during the hoisting or use of the PK board, the grouting truss is not likely to be separated from the main body of the PK board.

[0105] ③ Waterproof property test: PK boards of the same specifications (1.5m × 2.0m × 0.15m) in Examples 1 - 3 and Comparative Examples 1 - 4 were respectively sprayed with water on one side of the PK board. After 12 hours, the spraying was stopped, and the water absorption rate of the PK boards in Examples 1 - 3 and Comparative Examples 1 - 4 was calculated by the following formula. The waterproof property of the PK board was tested through the water absorption rate. The smaller the water absorption rate, the better the waterproof effect.

[0106] Water absorption rate = (mass of PK board after spraying - mass of PK board before spraying) / mass of PK board before spraying × 100%.

[0107] The test results are shown in Table 3.

[0108] Table 3 Water absorption rate of PK board

[0109]

[0110] As can be seen from Table 3, the PK board prepared by the present invention has good waterproof properties and can effectively prevent water from penetrating the PK board.

[0111] ④ Heat preservation property test: By measuring the thermal conductivity and thickness of PK boards of the same specifications (1.5m × 2.0m × 0.15m) in Examples 1 - 3 and Comparative Examples 1 - 4, and calculating the thermal resistance of the PK boards in Examples 1 - 3 and Comparative Examples 1 - 4 by the following formula, the heat preservation property of the PK board was tested through the thermal resistance value. The larger the thermal resistance value, the better the heat preservation property of the PK board.

[0112]

[0113] In the formula R is the thermal resistance, m 2 ·K / W; L is the thickness of the PK board, m; k is the thermal conductivity of the PK board, W / (m·K); A is the area perpendicular to the heat transfer direction, m 2 .

[0114] The test results are shown in Table 4

[0115] Table 4 Thermal resistance values of PK boards

[0116]

[0117] As can be seen from Table 4, the PK board prepared by the present invention has good heat preservation performance. It can reduce heat loss, and when combined with other heat preservation building materials, it can further enhance the heat preservation performance of the building

[0118] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims

Claims

1. A PK board, comprising a base plate and a plurality of high-strength prestressed steel bars arranged and fixed in the base plate, characterized in that, Laminated plates are integrally formed on both the upper and lower layers of the substrate. Above the upper laminated plate, a plurality of grouting trusses are provided. A plurality of connecting feet are welded and fixed on the grouting trusses. Part of the connecting feet are buried and fixed in the upper laminated plate, and a plurality of through holes are formed in the part of the connecting feet buried in the upper laminated plate. The upper and lower laminated plates and the rib plates are integrally cast from the same molding material. The molding material consists of 70-90 parts of cement, 8-12 parts of lignosulfonic acid formaldehyde condensate, 10-15 parts of silicon dioxide, 10-15 parts of fly ash, 20-30 parts of aggregate, 5-9 parts of calcium silicate, and 7-10 parts of magnesium oxide by weight. The preparation process of the molding material is as follows: mechanically mix the above-mentioned parts of cement, lignosulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate and magnesium oxide evenly to obtain.

2. The PK board according to claim 1, wherein The connecting feet are in a "J" shape structure, and the through holes are formed in the area outside the inflection point of the connecting feet.

3. The PK board according to claim 1, characterized in that, A plurality of channels are formed on the substrate. The channels and the high-strength prestressed steel bars are distributed at intervals, and the inside of the channels is filled with rib plates, and the rib plates are integrally formed with the upper and lower laminated plates.

4. The PK board according to claim 1, wherein The aggregate is a mixture of coarse aggregate and fine aggregate in a weight ratio of 2-5:1-3.

5. The PK board according to claim 4, characterized in that, The coarse aggregate is pebbles with a particle size of 4-8 mm, and the fine aggregate is crushed stones with a particle size of 1-3 mm.

6. A preparation method of a PK board according to any one of claims 1 to 5, characterized in that, It includes the following steps: S1. According to the design requirements, place the steel bars into the mold, and then comb and arrange the steel bars. S2. Perform prestress tension on the combed and arranged steel bars so that the steel bars reach the prestress value required by the design. S3. Uniformly arrange C50 concrete in the mold to ensure that the concrete wraps the steel bars and is filled densely. S4. After the C50 concrete dries to a certain extent, perform roughening treatment on the C50 concrete. S5. After the C50 concrete is completely dried, form the substrate, then open through channels on the substrate, and demold. S6. Place the substrate in step S5 into another mold, make the two sides of the mold clamp the substrate, so that there is a certain gap between the substrate and the bottom of the mold, and place a plurality of grouting trusses with connecting feet equidistantly above the substrate. S7. Add water to the molding material, stir well to form mortar, then add methanol and trichlorosilane to the mortar, stir and mix again, and pour it into the mold and fill it densely. S8. After standing for a period of time until the mortar solidifies to form laminated plates on the upper and lower sides of the substrate, demold to obtain the PK plate.

7. The preparation method of the PK board according to claim 6, characterized in that, In step S7, material: water (W / W)=1:3-4; methanol: trichlorosilane (W / W)=1-3:2-5.

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