PK plate and preparation method thereof

Abstract

The invention discloses a PK plate and a preparation method thereof, and belongs to the field of building materials. The PK plate comprises a base plate and a plurality of high-strength prestressed steel bars arranged and fixed in the base plate, laminated plates are integrally formed on the upper layer and the lower layer of the base plate, a plurality of grouting trusses are arranged above the upper laminated plate, a plurality of connecting feet are welded and fixed to the grouting trusses, and the connecting feet are partially embedded and fixed in the upper laminated plate. And a plurality of through holes are formed in the parts, embedded in the upper laminated plate, of the connecting pins. According to the PK plate prepared through the method, the connecting feet of the grouting truss are designed to be of the J-shaped structures, the multiple through holes are formed in the parts, embedded in the laminated plates, of the connecting feet, so that multiple cross-shaped connecting points are formed between the connecting feet and the laminated plates, and meanwhile the J-shaped structures can be hooked with the laminated plates; and therefore, the grouting truss can be firmly fixed on the PK plate.

Description

Technical Field

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

[0002] PK board is a prestressed concrete composite board with the characteristics of light weight, high rigidity, high bearing capacity and good crack resistance. And because PK board is manufactured and mass-produced in factories, it is not necessary to lay formwork during the construction phase, which can effectively save wooden formwork and support, shorten the construction period and reduce the cost. Therefore, it is widely used in the engineering construction industry. However, in the manufacturing process of traditional PK board, the connection node design between the grouting truss and the concrete is relatively complex, which increases the manufacturing difficulty and cost. In addition, 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 PK board, its thickness is relatively thin, which leads to the general waterproof and thermal insulation effect of traditional PK board. In the later construction process, additional construction operations are required, such as fixing waterproof and thermal insulation board on the outside of PK board to ensure the waterproof and thermal insulation effect of the building, which easily leads to a long construction period. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a PK board; another purpose of the present invention is to provide a method for preparing a PK board.

[0004] Technical solution: A PK plate comprises a base plate and a plurality of high-strength prestressed steel bars arranged and fixed in the base plate, the upper and lower layers of the base plate are integrally formed with composite plates, a plurality of grouting trusses are arranged above the upper composite plate, a plurality of connecting legs are welded and fixed on the grouting trusses, the connecting legs are partially embedded and fixed in the upper composite plate, and a plurality of through holes are opened on the portion of the connecting legs embedded in the upper composite plate.

[0005] Preferably, the connecting pin is a "J"-shaped structure, and the through hole is opened in a region outside the inflection point of the connecting pin.

[0006] Preferably, a plurality of channels are provided on the base plate, the channels are spaced at regular intervals from the high-strength prestressed steel bars, and the interior of the channels is filled with ribs, which are integrally formed with the upper and lower laminated plates.

[0007] Preferably, the upper and lower laminated plates and the rib plates are integrally cast with the same molding material, which includes cement, lignin sulfonate formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate and magnesium oxide.

[0008] Preferably, the molding material specifically comprises, by weight, 70-90 parts of cement, 8-12 parts of lignin sulfonate 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; the preparation process of the molding material is: mechanically mix the above-mentioned parts of cement, lignin sulfonate formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate and magnesium oxide uniformly 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 stone with a particle size of 1-3 mm.

[0011] A method for preparing a PK plate comprises the following steps:

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

[0013] S2. Prestress the steel bars that have been sorted and arranged, so that the steel bars reach the prestress value required by the design;

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

[0015] S4, after the C50 concrete is dried to a certain extent, roughening is performed on the C50 concrete;

[0016] S5. After the C50 concrete is completely dried, a base plate is formed, and then a through channel is opened on the base plate, and demoulding is performed;

[0017] S6, placing 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 a plurality of pipe trusses with connecting legs are placed equidistantly above the substrate;

[0018] S7, adding water to the molding material, and stirring thoroughly to form mortar, then adding methanol and trichlorosilane to the mortar, stirring and mixing again, and then pouring into the mold and filling densely;

[0019] S8. After the mortar solidifies on the upper and lower surfaces of the base plate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

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

[0021] Beneficial effects:

[0022] (1) The PK board prepared by the present invention designs the connection foot of the grouting truss into a "J"-shaped structure, and opens a plurality of through holes on the inner part of the composite board where the connection foot is buried, so that a plurality of cross-shaped connection points are formed between the connection foot and the composite board, and the "J"-shaped structure can also be hooked with the composite board, thereby enabling the grouting truss to be firmly fixed on the PK board. Compared with the complex node design between the traditional PK grouting truss and concrete, the connection design between the grouting truss and the PK board prepared by the present invention is simpler.

[0023] (2) The PK board prepared by the present invention hides the ribs inside the base plate, and the ribs are spaced apart from the high-strength prestressed steel bars inside the base plate, thereby forming a criss-cross grid structure inside the base plate, thereby making the PK load-bearing stronger. At the same time, compared with the method of directly casting the ribs on the outside of the base plate, the ribs hidden inside the base plate can ignore the limitation of the rib height, so that base plates of different thicknesses can be cast according to design requirements to improve the bending load-bearing capacity of the PK board.

[0024] (3) The PK board prepared by the present invention has a laminated board integrally formed on the upper and lower layers of the substrate, and the laminated board is made of the molding material prepared by the present invention. The methanol and trichlorosilane in the material will generate methylsilicic acid inside the material, thereby increasing the waterproof performance of the material, and the fly ash in the material can undergo a secondary hydration reaction with the calcium hydroxide in the cement, thereby filling the gaps and further increasing the water resistance of the material. In addition, the calcium silicate and magnesium oxide in the material can increase the thermal insulation performance of the material. Compared with the traditional PK board, the PK board prepared by the present invention has good waterproof and thermal insulation performance.

[0025] (4) The stacking plates in the PK board prepared by the present invention are located in the upper and lower layers of the base plate, and are integrally formed with the ribs in the base plate. The upper and lower stacking plates and the ribs form an I-shaped structure, which can avoid loose connection between the stacking plates and the base plate, thereby preventing the stacking plates from opening due to delamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of PK;

[0027] Figure 2 It is the AA section of the PK board;

[0028] In the figure: 1. base plate; 2. grouting truss; 3. connecting foot; 4. composite plate; 5. high-strength prestressed steel bar; 6. channel; 7. through hole; 8. rib plate. DETAILED DESCRIPTION

[0029] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] 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.

[0032] The upper and lower laminated plates 4 and the ribs 8 are made of the same molding material, which includes 70 parts of cement, 8 parts of lignin sulfonic 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. 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 4 mm, and the fine aggregate is crushed stone with a particle size of 1 mm.

[0033] The preparation method of the PK plate is as follows:

[0034] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0035] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0036] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps around the steel bars and fills them densely.

[0037] (4) After the C50 concrete has dried to a certain degree, the C50 concrete is roughened.

[0038] (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.

[0039] (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 pipe trusses with connecting legs equidistantly above the substrate.

[0040] (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.

[0041] (8) After the mortar solidifies on the upper and lower surfaces of the substrate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

[0042] Example 2

[0043] 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.

[0044] 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.

[0045] The preparation method of the PK plate is as follows:

[0046] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0047] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0048] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps around the steel bars and fills them densely.

[0049] (4) After the C50 concrete has dried to a certain degree, the C50 concrete is roughened.

[0050] (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.

[0051] (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 pipe trusses with connecting legs equidistantly above the substrate.

[0052] (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) = 2:3, stir again and pour into the mold, and fill tightly.

[0053] (8) After the mortar solidifies on the upper and lower surfaces of the substrate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

[0054] Example 3

[0055] 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.

[0056] 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, 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 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 8 mm, and the fine aggregate is crushed stone with a particle size of 3 mm.

[0057] The preparation method of the PK plate is as follows:

[0058] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0059] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0060] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps around the steel bars and fills them densely.

[0061] (4) After the C50 concrete has dried to a certain degree, the C50 concrete is roughened.

[0062] (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.

[0063] (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 pipe trusses with connecting legs equidistantly above the substrate.

[0064] (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.

[0065] (8) After the mortar solidifies on the upper and lower surfaces of the substrate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

[0066] Comparative Example 1

[0067] 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.

[0068] 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, 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 molding material is obtained by mechanically mixing the above parts of cement, lignin sulfonic acid formaldehyde condensate, silicon dioxide, aggregate, calcium silicate and magnesium oxide. 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.

[0069] The preparation method of the PK plate is as follows:

[0070] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0071] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0072] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps around the steel bars and fills them densely.

[0073] (4) After the C50 concrete has dried to a certain degree, the C50 concrete is roughened.

[0074] (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.

[0075] (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 pipe trusses with connecting legs equidistantly above the substrate.

[0076] (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.

[0077] (8) After the mortar solidifies on the upper and lower surfaces of the substrate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

[0078] Comparative Example 2

[0079] 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.

[0080] 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, 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 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 8 mm, and the fine aggregate is crushed stone with a particle size of 3 mm.

[0081] The preparation method of the PK plate is as follows:

[0082] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0083] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0084] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps around the steel bars and fills them densely.

[0085] (4) After the C50 concrete has dried to a certain degree, the C50 concrete is roughened.

[0086] (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.

[0087] (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 pipe trusses with connecting legs equidistantly above the substrate.

[0088] (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.

[0089] (8) After the mortar solidifies on the upper and lower surfaces of the substrate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

[0090] Comparative Example 3

[0091] like Figure 1-2As 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.

[0092] 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 mechanically mixing the above parts of cement, lignin sulfonic acid formaldehyde condensate, silicon dioxide, fly ash, and aggregate. 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.

[0093] The preparation method of the PK plate is as follows:

[0094] (1) According to the design requirements, place the steel bars into the mold, and then sort and arrange the steel bars.

[0095] (2) Prestress the steel bars that have been sorted and arranged so that they reach the prestress required by the design.

[0096] (3) Arrange the C50 concrete evenly in the mold, ensuring that the concrete wraps around the steel bars and fills them densely.

[0097] (4) After the C50 concrete has dried to a certain degree, the C50 concrete is roughened.

[0098] (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.

[0099] (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 pipe trusses with connecting legs equidistantly above the substrate.

[0100] (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.

[0101] (8) After the mortar solidifies on the upper and lower surfaces of the substrate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

[0102] Comparative Example 4

[0103] The fourth generation PK plate is commercially available.

[0104] PK performance test:

[0105] 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.

[0106] Table 1 PK board bearing capacity

[0107] PK board of embodiment and comparative example <![CDATA[Bearing capacity (KN / m 2 )]]> Example 1 1.13 Example 2 1.17 Example 3 1.22 Comparative Example 1 1.21 Comparative Example 2 1.21 Comparative Example 3 1.21 Comparative Example 4 1.05

[0108] 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.

[0109] ②, tensile performance test: the same specifications (1.5m×2.0m×0.15m) of PK boards of Examples 1 to 3 and Comparative Examples 1 to 4 are fixed on the YM-160T hydraulic press stage in sequence, and then the steel wire rope is fixed on the grouting truss, and the other end of the steel wire rope is fixed on the CLY-10T tensile gauge, and the other end of the tensile gauge is on the hydraulic column of the hydraulic press. The hydraulic press is started to retract the hydraulic column. When the upper laminated board cracks, the tensile gauge reading is recorded and the hydraulic press is closed. The test results are shown in Table 2.

[0110] Table 2 PK board tensile strength

[0111] PK board of embodiment and comparative example Tensile strength(KN) Example 1 12.27 Example 2 12.31 Example 3 12.37 Comparative Example 1 12.35 Comparative Example 2 12.35 Comparative Example 3 12.35 Comparative Example 4 12.23

[0112] It can be seen from Table 2 that the PK board prepared by the present invention has better tensile properties, and through a simple node design between the grouting truss and the PK board body, the grouting truss and the PK board can be firmly connected and fixed together, so that the grouting truss is not easy to separate from the PK board body during the lifting or use of the PK board.

[0113] ③. Waterproof performance test: PK boards of the same specifications (1.5m×2.0m×0.15m) of Examples 1 to 3 and Comparative Examples 1 to 4 were sprayed with water on one side of the PK boards. After 12 hours, the spraying was stopped, and the water absorption rate of the PK boards of Examples 1 to 3 and Comparative Examples 1 to 4 was calculated by the following formula. The water absorption rate was used to test the water resistance of the PK board. The smaller the water absorption rate, the better the water resistance effect.

[0114] Moisture absorption rate = (mass of PK board after spraying - mass of PK board before spraying) / mass of PK board before spraying × 100%.

[0115] The test results are shown in Table 3.

[0116] Table 3 PK board moisture absorption rate

[0117] PK board of embodiment and comparative example Water absorption rate (%) Example 1 3.02 Example 2 2.65 Example 3 2.13 Comparative Example 1 2.27 Comparative Example 2 4.51 Comparative Example 3 2.15 Comparative Example 4 5.07

[0118] It can be seen from Table 3 that the PK board prepared by the present invention has good waterproof performance and can effectively prevent water from penetrating the PK board.

[0119] ④. Thermal insulation performance test: By measuring the thermal conductivity and thickness 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, and calculating the thermal resistance of the PK boards of Examples 1 to 3 and Comparative Examples 1 to 4 by the following formula, the thermal insulation performance of the PK boards was tested by the thermal resistance value. The larger the thermal resistance value, the better the thermal insulation performance of the PK board.

[0120]

[0121] Where R is 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 direction of heat transfer, m 2 .

[0122] The test results are shown in Table 4.

[0123] Table 4 PK board thermal resistance

[0124]

[0125]

[0126] As shown in Table 4, the PK board prepared by the present invention has good thermal insulation performance, can reduce heat loss, and can further increase the thermal insulation performance of the building when combined with other thermal insulation building materials.

[0127] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which 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 attached claims.

Claims

1. A PK plate, comprising a base plate and a plurality of high-strength prestressed steel bars arranged and fixed in the base plate, characterized in that: The upper and lower layers of the base plate are integrally formed with a composite plate, and a plurality of grouting trusses are arranged above the upper composite plate. A plurality of connecting feet are welded and fixed on the grouting trusses. The connecting feet are partially embedded and fixed in the upper composite plate, and a plurality of through holes are opened on the part of the connecting feet embedded in the upper composite plate.

2. The PK board according to claim 1, characterized in that: The connecting pin is a "J"-shaped structure, and the through hole is arranged in a region outside the turning point of the connecting pin.

3. The PK board according to claim 1, characterized in that: A plurality of channels are provided on the base plate, and the channels are spaced at regular intervals from the high-strength prestressed steel bars. The interior of the channels is filled with ribs, and the ribs are integrally formed with the upper and lower laminated plates.

4. The PK board according to claim 1, characterized in that: The upper and lower laminated plates and the rib plates are integrally cast and formed by the same molding material, which includes cement, lignin sulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate and magnesium oxide.

5. The PK board according to claim 4, characterized in that: The molding material specifically comprises, by weight, 70-90 parts of cement, 8-12 parts of lignin sulfonic 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. The preparation process of the molding material is as follows: the above-mentioned parts of cement, lignin sulfonic acid formaldehyde condensate, silicon dioxide, fly ash, aggregate, calcium silicate and magnesium oxide are mechanically mixed uniformly to obtain the molding material.

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

7. The PK board according to claim 6, characterized in that: The coarse aggregate is pebbles with a particle size of 4-8 mm, and the fine aggregate is crushed stone with a particle size of 1-3 mm.

8. A method for preparing a PK board according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. According to the design requirements, put the steel bars into the mold, and then sort and arrange the steel bars; S2. Prestress the steel bars that have been sorted and arranged, so that the steel bars reach the prestress value required by the design; S3. Evenly arrange the C50 concrete in the mold to ensure that the concrete wraps the steel bars and fills them densely; S4, after the C50 concrete is dried to a certain extent, roughening is performed on the C50 concrete; S5. After the C50 concrete is completely dried, a base plate is formed, and then a through channel is opened on the base plate, and demoulding is performed; S6, placing 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 a plurality of pipe trusses with connecting legs are placed equidistantly above the substrate; S7, adding water to the molding material, and stirring thoroughly to form mortar, then adding methanol and trichlorosilane to the mortar, stirring and mixing again, and then pouring into the mold and filling densely; S8. After the mortar solidifies on the upper and lower surfaces of the base plate for a period of time to form a composite board, demoulding is performed to obtain a PK board.

9. The method for preparing the PK board according to claim 8, 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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