A bidirectional self-stressed prefabricated panel and prefabrication method thereof

Abstract

The invention relates to a bidirectional self-stressed prefabricated panel and a prefabrication method thereof. The bidirectional self-stressed prefabricated panel comprises: expansive concrete, a prefabricated panel base and a self-stressing device. The expansion of the poured expansive concrete causes the self-stressed tensioning panels arranged in the longitudinal and transverse directions to move outward, and the self-stressed tensioning panels drive the self-stressed tendons to be tensioned. At the same time, the self-stressed tensioning panels apply longitudinal and transverse self-stress to the prefabricated panels in the reverse direction. The bidirectional self-stressed panel has strong longitudinal and transverse rigidity and integrity, and has the characteristics of high quality, simple process, low cost, no need for grouting, and green environmental protection, thereby solving the problems of low rigidity and easy cracking of ordinary prefabricated panels, high cost of bidirectional prestressed prefabricated panels, complex process, and poor durability.

Description

Technical Field

[0001] The present invention relates to a bidirectional self-stressed prefabricated board and a prefabrication method thereof, and in particular to a bidirectional self-stressed prefabricated board comprising a prefabricated board and a self-stressed tensioning board, wherein the self-stressed tensioning board applies longitudinal and transverse bidirectional self-stress to the prefabricated board in reverse. Background Art

[0002] Ordinary reinforced concrete precast panels have low overall stiffness and are prone to cracking. After cracking, the steel bars are prone to corrosion, which shortens the service life of the precast panels. Precast panels for roads with heavy traffic require bidirectional prestressing to meet the use requirements under heavy loads.

[0003] The production of bidirectional prestressed precast panels can adopt the post-tensioning process. The post-tensioning method is to tension the longitudinal and transverse prestressed tendons to form bidirectional prestress after the poured concrete reaches more than 75% of the design strength. The grouting of the post-tensioned bidirectional stress precast panels is greatly affected by temperature, and it is not easy to be dense, the durability is insufficient, the tensioning requires more working anchors, the process is complicated, and the cost is high. The pre-tensioning method can apply longitudinal prestress to the precast panels, but cannot apply transverse prestress.

[0004] A bidirectional self-stressed cement concrete precast panel structure for roads, in which the expansion of the poured expansive concrete causes the self-stressed tensioning panels arranged in the longitudinal and transverse directions to move outward, and the self-stressed tensioning panels drive the self-stressed tendons to be tensioned, and at the same time the self-stressed tensioning panels apply bidirectional self-stress in the longitudinal and transverse directions to the precast panels in the reverse direction. The bidirectional self-stressed panels have strong longitudinal and transverse rigidity and integrity, and have the characteristics of high quality, simple process, low cost, no grouting, and green environmental protection, solving the problems of low rigidity and easy cracking of ordinary precast panels, high cost, complex process, and poor durability of bidirectional prestressed precast panels. Summary of the invention

[0005] In view of the problems existing in the related art, the object of the present invention is to provide a bidirectional self-stressed prefabricated panel, characterized in that it includes expansive concrete, a prefabricated panel base and a self-stressing device, characterized in that:

[0006] A self-stressing device is arranged on the base in a vertical and horizontal direction perpendicular to each other;

[0007] The self-stress device is composed of self-stress tendons and a self-stress tensioning plate. The self-stress tensioning plate is arranged on the end surface of the expansive concrete. The self-stress tendons are cast in the expansive concrete. During the expansion process, the expansive concrete generates tension on the self-stress tensioning plate through the self-stress tendons, so that the self-stress tensioning plate generates compressive stress on the expansive concrete, wherein:

[0008] The self-stress tensioning plates are aligned and evenly arranged at the longitudinal and transverse ends of the bidirectional self-stress prefabricated plate, and reserved holes are left on the self-stress tensioning plates;

[0009] The self-stressing tendons are composed of secondary steel bars, including longitudinal self-stressing tendons and transverse self-stressing tendons;

[0010] The prefabricated slab base is composed of a treated foundation, a concrete base, angle steel, longitudinal and transverse structural reinforcements, and a terrazzo surface layer;

[0011] Bolt holes and supporting steel formwork are evenly spaced in the base foundation along the length direction of the self-stressing tendons and fixed to the base with tension bolts.

[0012] According to a preferred embodiment of the present invention, the longitudinal self-stressing tendons pass through the reserved holes of the self-stressing tensioning plate and are welded and fixed to the self-stressing tensioning plate;

[0013] The longitudinal external self-stressed reinforcement bars connected to the embedded reinforcement bars are left outside the self-stressed tensioning plates on both sides;

[0014] One end of the transverse self-stressing tendon is fixed through the reserved hole of the self-stressing tensioning plate, and the other end is directly welded and fixed to the self-stressing tensioning plate;

[0015] Transverse external self-stressed reinforcement connected to the embedded reinforcement is left on the outer side of the through-end self-stressed tensioning plate.

[0016] According to another preferred embodiment of the present invention, the number of the self-stressing ribs is 4, the diameter is 16 mm-18 mm, and they are distributed in a rectangular or square shape.

[0017] According to another preferred embodiment of the present invention, the prefabricated panel has a length of 2m-6m, a width of 2m-3.6m, and a thickness of 16cm-24cm.

[0018] According to another preferred embodiment of the present invention, the self-stressed tensioning plate is a low alloy steel plate with a height of 15cm-23cm, a width of 18cm-24cm, and a thickness of 0.4cm-0.6cm; the self-stressed tensioning plate includes a transverse self-stressed tensioning plate and a longitudinal self-stressed tensioning plate, and the net spacing between the transverse self-stressed tensioning plates is 10 cm-20 cm, and the net spacing between the longitudinal self-stressed tensioning plates is 30 cm-50 cm.

[0019] According to another preferred embodiment of the present invention, the compressive stress generated on the self-stressed tensioning plate by the expansion of the expansive concrete is in the range of 2 MPa-5 MPa.

[0020] According to another preferred embodiment of the present invention, the self-stressing ribs are of model HRB335 and have a diameter of 16 mm-20 mm.

[0021] According to another preferred embodiment of the present invention, the terrazzo surface layer of the prefabricated panel base is composed of angle steel, anti-cracking transverse and longitudinal structural reinforcements, terrazzo concrete, and anchor nails for fixing the angle steel.

[0022] According to another preferred embodiment of the present invention, the transverse structural reinforcement and the longitudinal structural reinforcement are respectively welded to the angle steels on both sides; the base foundation number is 25mpa-30mpa, the angle steel model is 50mm×50mm×5mm, the longitudinal structural reinforcement and the transverse structural reinforcement are secondary steel bars with a diameter of 10mm-12mm; the spacing between the transverse structural reinforcements is 80cm-120cm, the longitudinal structural reinforcement is 100cm-120cm, and the spacing between the anchors is 50cm-80cm.

[0023] According to another aspect of the present invention, a method for manufacturing a bidirectional self-stressed prefabricated plate base is provided, wherein the method comprises the following steps:

[0024] S01, treat the foundation with 4-5% cement soil and compact it at 95% compaction degree;

[0025] S02, the foundation is watered and cured for 3 days, and a precast slab base with a grade of 25mpa-30mpa and a thickness of 15cm is cast on the cement soil foundation. The size is the same as that of the bidirectional self-stressed precast slab; a plastic pipe with a diameter of 3cm-5cm is embedded in the concrete base as a bolt hole for the tension bolts;

[0026] S03, use anchor nails to anchor the angle steel on the outside of the bidirectional self-stressed precast slab foundation, and weld the longitudinal and transverse structural reinforcements to the angle steel. The model of the angle steel is 50mm×50mm×5mm, and the longitudinal and transverse structural reinforcements are secondary steel bars with a diameter of 10mm-12mm; the spacing between the transverse structural reinforcements is 80cm-120cm, the longitudinal structural reinforcement is 100cm-120cm, and the spacing between the anchor nails is 50cm-80cm.

[0027] S04, pour terrazzo concrete in the angle steel, compact it with a vibrator, level the top layer of terrazzo with a three-meter ruler, and finally finish it with a trowel.

[0028] S05, cover with health care cloth for 5 days.

[0029] S06, use a grinder to polish the top surface of the terrazzo, the flatness should not exceed 2mm.

[0030] According to another aspect of the present invention, a method for prefabricating a bidirectional self-stressed prefabricated panel is provided, wherein the method comprises the following steps:

[0031] Treat the precast slab base foundation;

[0032] Pouring a bidirectional self-stressed precast slab concrete base on the foundation;

[0033] Use anchor nails to fix angle steel outside the concrete base, weld vertical and horizontal structural reinforcements, pour terrazzo concrete, and polish the top surface of terrazzo with a polisher after curing for 5 days;

[0034] A self-stress device perpendicular to the longitudinal and transverse directions is arranged on the bidirectional base of the prefabricated plate, the self-stress device is composed of self-stress tendons and self-stress tensioning plates, the self-stress tensioning plates are aligned and evenly arranged at the longitudinal and transverse ends of the bidirectional self-stress prefabricated plate, and the self-stress tendons are distributed in a rectangular or square shape;

[0035] The longitudinal self-stressing tendons pass through the reserved holes of the self-stressing tensioning plate and are welded and fixed to the self-stressing tensioning plate. The outer sides of the self-stressing tensioning plates on both sides are provided with longitudinal external self-stressing tendons connected to the embedded tendons. One end of the transverse self-stressing tendons passes through the reserved holes of the self-stressing tensioning plate and is fixed. The other end is directly welded and fixed to the self-stressing tensioning plate. The outer sides of the self-stressing tensioning plates on the passing ends are provided with transverse external self-stressing tendons connected to the embedded tendons.

[0036] Bolt holes are evenly spaced along the length direction of the longitudinal and transverse self-stressing tendons, and the steel formwork is supported and fixed to the base with tension bolts;

[0037] Pour the expansive concrete and compact it with a vibrator, polish it with a grinder after raising the slurry, and finally finish it manually;

[0038] After covering with curing cloth for 7 days, use a notching machine to make grooves on the top of the board.

[0039] According to another preferred embodiment of the present invention, the size of the base is equal to the length and width of the bidirectional self-stressed prefabricated plate;

[0040] The longitudinal length of the bidirectional self-stressed prefabricated board is 36 cm-44 cm shorter than the longitudinal side of the precut rectangle or square, the transverse side is 18 cm-22 cm shorter, and the thickness is 8 mm-10 mm thinner; the concrete grade of the bidirectional self-stressed prefabricated board is 35 MPa-40 MPa, the concrete adopts high-expansion cement concrete, and the content of high-efficiency expansion agent is 8-12%.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention provides a bidirectional self-stressed prefabricated panel and a prefabrication method thereof. The self-stressed tensioning panels arranged in the longitudinal and transverse directions are moved outwards due to the expansion of the poured expansive concrete. The self-stressed tensioning panels drive the self-stressed tendons to be tensioned. At the same time, the self-stressed tensioning panels apply bidirectional self-stress in the longitudinal and transverse directions to the prefabricated panels in the reverse direction. The bidirectional self-stressed panels have strong longitudinal and transverse rigidity and integrity, and have the characteristics of high quality, simple process, low cost, no need for grouting, and green environmental protection. The problems of low rigidity and easy cracking of ordinary prefabricated panels and high cost, complex process, and poor durability of bidirectional prestressed prefabricated panels are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a plan view of the bidirectional self-stressed prefabricated panel of the present invention.

[0044] Figure 2 It is a schematic diagram of the transverse self-stress device of the present invention.

[0045] Figure 3 It is a schematic diagram of the longitudinal self-stressing device of the present invention.

[0046] Figure 4 It is a cross-sectional view of the prefabricated board base of the present invention.

[0047] Figure 5 It is a plan view of the prefabricated panel base of the present invention.

[0048] The relevant reference numerals are as follows:

[0049] 1. Bidirectional self-stressed precast slab; 2. Transverse self-stressed reinforcement; 3. Longitudinal self-stressed reinforcement; 4. Transverse external self-stressed reinforcement; 5. Longitudinal external self-stressed reinforcement; 6. Expansive concrete; 7. Self-stressed tensioning plate; 8. Reserved holes for self-stressed tensioning plate; 9. Self-stressed reinforcement welding points; 10. Transverse structural reinforcement; 11. Longitudinal structural reinforcement; 12. Anchor nails; 13. Angle steel; 14. Terrazzo surface layer; 15. Concrete base layer; 16. Bolt holes; 17. Treated foundation. DETAILED DESCRIPTION

[0050] Next, we will refer to Figure 1-5 The bidirectional self-stressed prefabricated plate and the base manufacturing method thereof according to the present invention are further described and illustrated, wherein reference is made to Figure 1-3 The present invention provides a bidirectional self-stressed prefabricated panel 1, comprising an expansion concrete 6, a prefabricated panel base and a self-stressing device, characterized in that:

[0051] A self-stressing device is arranged on the base in a vertical and horizontal direction perpendicular to each other;

[0052] The self-stressing device is composed of self-stressing tendons and self-stressing tensioning plates 7. The self-stressing tendons include transverse self-stressing tendons 2, longitudinal self-stressing tendons 3, transverse external self-stressing tendons 4 and longitudinal external self-stressing tendons 5. For specific configuration, please refer to Figure 1 The self-stress tensioning plate 7 is arranged on the end surface of the expansive concrete 6, and the self-stressing tendons are cast in the expansive concrete 6. During the expansion process of the expansive concrete 6, the self-stressing tendons generate tension on the self-stress tensioning plate 7, so that the self-stressing tensioning plate 7 generates compressive stress on the expansive concrete 6, wherein:

[0053] The self-stress tensioning plates 7 are aligned and evenly arranged at the longitudinal and transverse ends of the bidirectional self-stress prefabricated plate, and reserved holes 8 are left on the self-stress tensioning plates;

[0054] The self-stressing tendons are composed of secondary steel bars, including longitudinal self-stressing tendons 3 and transverse self-stressing tendons 2;

[0055] The prefabricated slab base is composed of a processed foundation 17, a concrete base layer 15, angle steels 13, transverse structural reinforcements 10, longitudinal structural reinforcements 11 and a terrazzo surface layer 14.

[0056] Bolt holes 16 and supporting steel formwork (not shown in the figure, but actually a supporting steel plate) are evenly spaced in the base foundation along the length direction of the self-stressing tendons and fixed to the base with tension bolts.

[0057] Preferably, the longitudinal self-stressing tendons 3 pass through the reserved holes 8 of the self-stressing tensioning plate and are welded and fixed to the self-stressing tensioning plate 7;

[0058] The longitudinal external self-stressing tendons 3 connected to the embedded tendons are left outside the self-stressing tensioning plates 7 on both sides;

[0059] One end of the transverse self-stressing tendon 2 is fixed through the reserved hole 8 of the self-stressing tensioning plate, and the other end is directly welded and fixed to the self-stressing tensioning plate 7;

[0060] A transverse external self-stressing tendon 4 connected to the embedded tendon is left outside the self-stressing tensioning plate 7 at the through end.

[0061] More preferably, the number of the self-stressing ribs is 4, the diameter is 16mm-18mm, and they are distributed in a rectangular or square shape.

[0062] Further preferably, the prefabricated board has a length of 2m-6m, a width of 2m-3.6m, and a thickness of 16cm-24cm.

[0063] Preferably, the self-stressed tensioning plate is a low alloy steel plate with a height of 15cm-23cm, a width of 18cm-24cm, and a thickness of 0.4cm-0.6cm; the self-stressed tensioning plate includes a transverse self-stressed tensioning plate and a longitudinal self-stressed tensioning plate, the net spacing of the transverse self-stressed tensioning plates is 10 cm-20 cm, and the net spacing of the longitudinal self-stressed tensioning plates is 30 cm-50 cm.

[0064] Preferably, the compressive stress generated on the self-stressed tensioning plate by the expansion of the expansive concrete is in the range of 2 MPa-5 MPa.

[0065] Further preferably, the self-stressing ribs are of model HRB335 and have a diameter of 16 mm-20 mm.

[0066] The above parameters are the optimal parameters selected by the inventor after numerous tests and on-site construction results. They are not subjective conjectures, but are obtained through countless comparisons, references and continuous changes.

[0067] Preferably, the terrazzo surface layer 14 of the prefabricated slab base is composed of angle steel 13 , anti-cracking transverse structural ribs 10 and longitudinal structural ribs 11 , terrazzo concrete and anchors 12 for fixing the angle steel 13 .

[0068] The transverse structural reinforcement 10 and the longitudinal structural reinforcement 11 are respectively welded to the angle steels 13 on both sides; the base foundation grade is 25mpa-30mpa, the angle steel model is 50mm×50mm×5mm, the longitudinal structural reinforcement and the transverse structural reinforcement are secondary steel bars with a diameter of 10mm-12mm; the spacing between the transverse structural reinforcements is 80cm-120cm, the spacing between the longitudinal structural reinforcements is 100cm-120cm, and the spacing between the anchor nails is 50cm-80cm.

[0069] The above parameters are also the optimal parameters selected by the inventor after numerous tests and on-site construction results. They are not subjective conjectures, but are obtained through countless comparisons, references and continuous changes.

[0070] The present invention also provides a method for manufacturing a bidirectional self-stressed prefabricated plate base, see Figure 4-5 , the method comprises the following steps:

[0071] S01, treat the foundation with 4-5% cement soil and compact it at 95% compaction degree;

[0072] S02, the foundation is watered and cured for 3 days, and a precast slab base with a grade of 25mpa-30mpa and a thickness of 15cm is cast on the cement soil foundation. The size is the same as that of the bidirectional self-stressed precast slab; a plastic pipe with a diameter of 3cm-5cm is embedded in the concrete base as a bolt hole for the tension bolts;

[0073] S03, use anchor nails to anchor the angle steel on the outside of the bidirectional self-stressed precast slab foundation, and weld the longitudinal and transverse structural reinforcements to the angle steel. The model of the angle steel is 50mm×50mm×5mm, and the longitudinal and transverse structural reinforcements are secondary steel bars with a diameter of 10mm-12mm; the spacing between the transverse structural reinforcements is 80cm-120cm, the longitudinal structural reinforcement is 100cm-120cm, and the spacing between the anchor nails is 50cm-80cm.

[0074] S04, pour terrazzo concrete in the angle steel, compact it with a vibrator, level the top layer of terrazzo with a three-meter ruler, and finally finish it with a trowel.

[0075] S05, cover with health care cloth for 5 days.

[0076] S06, use a grinder to polish the top surface of the terrazzo, the flatness should not exceed 2mm.

[0077] In addition, the present invention also provides a prefabrication method of a bidirectional self-stressed prefabricated panel (not shown in the figure), characterized in that the method comprises the following steps:

[0078] Treat the precast slab base foundation;

[0079] Pouring a bidirectional self-stressed precast slab concrete base on the foundation;

[0080] Use anchor nails to fix angle steel outside the concrete base, weld vertical and horizontal structural reinforcements, pour terrazzo concrete, and polish the top surface of terrazzo with a polisher after curing for 5 days;

[0081] A self-stress device perpendicular to the longitudinal and transverse directions is arranged on the bidirectional base of the prefabricated plate, the self-stress device is composed of self-stress tendons and self-stress tensioning plates, the self-stress tensioning plates are aligned and evenly arranged at the longitudinal and transverse ends of the bidirectional self-stress prefabricated plate, and the self-stress tendons are distributed in a rectangular or square shape;

[0082] The longitudinal self-stressing tendons pass through the reserved holes of the self-stressing tensioning plate and are welded and fixed to the self-stressing tensioning plate. The outer sides of the self-stressing tensioning plates on both sides are provided with longitudinal external self-stressing tendons connected to the embedded tendons. One end of the transverse self-stressing tendons passes through the reserved holes of the self-stressing tensioning plate and is fixed. The other end is directly welded and fixed to the self-stressing tensioning plate. The outer sides of the self-stressing tensioning plates on the passing ends are provided with transverse external self-stressing tendons connected to the embedded tendons.

[0083] Bolt holes are evenly spaced along the length direction of the longitudinal and transverse self-stressing tendons, and the steel formwork is supported and fixed to the base with tension bolts;

[0084] Pour the expansive concrete and compact it with a vibrator, polish it with a grinder after raising the slurry, and finally finish it manually;

[0085] After covering with curing cloth for 7 days, use a notching machine to make grooves on the top of the board.

[0086] Preferably, the application and installation method of the bidirectional self-stressed prefabricated panel as described above, wherein:

[0087] The size of the base is equal to the length and width of the bidirectional self-stressed prefabricated plate;

[0088] The longitudinal length of the bidirectional self-stressed prefabricated board is 36 cm-44 cm shorter than the longitudinal side of the precut rectangle or square, the transverse side is 18 cm-22 cm shorter, and the thickness is 8 mm-10 mm thinner; the concrete grade of the bidirectional self-stressed prefabricated board is 35 MPa-40 MPa, the concrete adopts high-expansion cement concrete, and the content of high-efficiency expansion agent is 8-12%.

[0089] It can be seen that the present invention provides a bidirectional self-stressed prefabricated panel and a prefabrication method thereof, in which the self-stressed tensioning panels arranged in the longitudinal and transverse directions are moved outward by the expansion of the poured expansive concrete, and the self-stressed tensioning panels drive the self-stressed tendons to be tensioned, and at the same time the self-stressed tensioning panels apply bidirectional self-stress in the longitudinal and transverse directions to the prefabricated panels in the reverse direction. The bidirectional self-stressed panels have strong longitudinal and transverse stiffness and integrity, and have the characteristics of high quality, simple process, low cost, no grouting, and green environmental protection, which solves the problems of low stiffness and easy cracking of ordinary prefabricated panels, high cost, complex process, and poor durability of bidirectional prestressed prefabricated panels.

[0090] Although the exemplary embodiments and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications may be made to these embodiments without departing from the spirit of the present invention and the scope of protection defined by the appended claims. For other examples, it should be readily understood by those skilled in the art that the order of the process steps may be changed while maintaining the scope of protection of the present invention.

[0091] In addition, the scope of application of the present invention is not limited to the processes, mechanisms, manufactures, material compositions, means, methods and steps of the specific embodiments described in the specification. From the disclosure of the present invention, it will be easily understood by those skilled in the art that the processes, mechanisms, manufactures, material compositions, means, methods or steps that currently exist or will be developed in the future, which perform substantially the same functions as the corresponding embodiments described in the present invention or obtain substantially the same results, can be applied according to the present invention. Therefore, the claims attached to the present invention are intended to include these processes, mechanisms, manufactures, material compositions, means, methods or steps within their scope of protection.

Claims

1. A bidirectional self-stressed prefabricated panel, comprising expansive concrete, a prefabricated panel base and a self-stressing device, characterized in that: A self-stressing device is arranged on the base in a vertical and horizontal direction perpendicular to each other; The self-stress device is composed of self-stress tendons and a self-stress tensioning plate. The self-stress tensioning plate is arranged on the end surface of the expansive concrete. The self-stress tendons are cast in the expansive concrete. During the expansion process, the expansive concrete generates tension on the self-stress tensioning plate through the self-stress tendons, so that the self-stress tensioning plate generates compressive stress on the expansive concrete, wherein: The self-stress tensioning plates are aligned and evenly arranged at the longitudinal and transverse ends of the bidirectional self-stress prefabricated plate, and reserved holes are left on the self-stress tensioning plates; The self-stressing tendons are composed of secondary steel bars, including longitudinal self-stressing tendons and transverse self-stressing tendons; The prefabricated slab base is composed of a treated foundation, a concrete base, angle steel, longitudinal and transverse structural reinforcements, and a terrazzo surface layer; Angle steel is fixed with anchor nails outside the concrete base, longitudinal and transverse structural reinforcements are welded to the angle steel, and the terrazzo surface layer is formed inside the angle steel; Bolt holes and supporting steel formwork for pouring expansion concrete are evenly spaced in the base foundation along the length direction of the self-stressing tendons and fixed to the base with tension bolts.

2. The bidirectional self-stressed prefabricated panel according to claim 1, wherein: The longitudinal self-stressing tendons pass through the reserved holes of the self-stressing tensioning plate and are welded and fixed to the self-stressing tensioning plate; The longitudinal external self-stressed reinforcement bars connected to the embedded reinforcement bars are left outside the self-stressed tensioning plates on both sides; One end of the transverse self-stressing tendon is fixed through the reserved hole of the self-stressing tensioning plate, and the other end is directly welded and fixed to the self-stressing tensioning plate; Transverse external self-stressed reinforcement connected to the embedded reinforcement is left on the outer side of the self-stressed tensioning plate at the through end.

3. The bidirectional self-stressed prefabricated panel according to claim 1, wherein: The number of the self-stressing tendons is 4, the diameter is 16mm-18mm, and they are distributed in a rectangular or square shape.

4. The bidirectional self-stressed prefabricated panel according to claim 1, wherein: The prefabricated board has a length of 2m-6m, a width of 2m-3.6m, and a thickness of 16cm-24cm.

5. The bidirectional self-stressed prefabricated panel according to claim 1, wherein: The self-stressed tensioning plate is a low alloy steel plate with a height of 15cm-23cm, a width of 18cm-24cm, and a thickness of 0.4cm-0.6cm; the self-stressed tensioning plate includes a transverse self-stressed tensioning plate and a longitudinal self-stressed tensioning plate, the net spacing of the transverse self-stressed tensioning plate is 10 cm-20 cm, and the net spacing of the longitudinal self-stressed tensioning plate is 30 cm-50 cm.

6. The bidirectional self-stressed prefabricated panel according to claim 1, wherein: The expansion of the expansive concrete generates a compressive stress in the range of 2 MPa to 5 MPa on the self-stressed tensioning plate.

7. The bidirectional self-stressed prefabricated panel according to claim 1, wherein: The model of the self-stressing rib is HRB335, and the diameter is 16mm-20mm.

8. The bidirectional self-stressed prefabricated panel according to claim 1, wherein: The terrazzo surface layer of the prefabricated board base is composed of angle steel, transverse and longitudinal structural reinforcements for preventing cracking, terrazzo concrete, and anchor nails for fixing the angle steel.

9. The bidirectional self-stressed prefabricated panel according to claim 8, wherein: The transverse structural reinforcement and the longitudinal structural reinforcement are respectively welded to the angle steels on both sides; the base foundation grade is 25mpa-30mpa, the angle steel model is 50mm×50mm×5mm, the longitudinal structural reinforcement and the transverse structural reinforcement are secondary steel bars with a diameter of 10mm-12mm; the spacing between the transverse structural reinforcements is 80cm-120cm, the longitudinal structural reinforcements is 100cm-120cm, and the spacing between the anchor nails is 50cm-80cm.

10. A method for manufacturing a prefabricated board base based on the bidirectional self-stressed prefabricated board according to claim 1, characterized in that: The method comprises the following steps: S01, treat the foundation with 4-5% cement soil and compact it at 95% compaction degree; S02, the foundation is watered and cured for 3 days, and a precast slab base with a grade of 25mpa-30mpa and a thickness of 15cm is cast on the cement soil foundation. The size is the same as that of the bidirectional self-stressed precast slab; a plastic pipe with a diameter of 3cm-5cm is embedded in the concrete base as a bolt hole for the tension bolts; S03, Anchor angle steel is anchored with anchor nails on the outside of the bidirectional self-stressed precast slab foundation, and the longitudinal and transverse structural reinforcements are welded to the angle steel. The model of the angle steel is 50mm×50mm×5mm, and the longitudinal and transverse structural reinforcements are secondary steel bars with a diameter of 10mm-12mm; the spacing between the transverse structural reinforcements is 80cm-120cm, the longitudinal structural reinforcements are 100cm-120cm, and the spacing between the anchor nails is 50cm-80cm; S04, pour terrazzo concrete in the angle steel, compact it with a vibrator, level the top layer of terrazzo with a three-meter ruler, and finally finish it with a trowel; S05, covered with health care cloth for 5 days; S06, use a grinder to polish the top surface of the terrazzo, the flatness should not exceed 2mm.

11. A prefabrication method of the bidirectional self-stressed prefabricated panel according to claim 1, characterized in that: The method comprises the following steps: Treat the precast slab base foundation; Pouring a bidirectional self-stressed precast slab concrete base on the foundation; Use anchor nails to fix angle steel outside the concrete base, weld vertical and horizontal structural reinforcements, pour terrazzo concrete, and polish the top surface of terrazzo with a polisher after curing for 5 days; A self-stress device perpendicular to the longitudinal and transverse directions is arranged on the bidirectional base of the prefabricated plate, the self-stress device is composed of self-stress tendons and self-stress tensioning plates, the self-stress tensioning plates are aligned and evenly arranged at the longitudinal and transverse ends of the bidirectional self-stress prefabricated plate, and the self-stress tendons are distributed in a rectangular or square shape; The longitudinal self-stressing tendons pass through the reserved holes of the self-stressing tensioning plate and are welded and fixed to the self-stressing tensioning plate. The outer sides of the self-stressing tensioning plates on both sides are provided with longitudinal external self-stressing tendons connected to the embedded tendons. One end of the transverse self-stressing tendons passes through the reserved holes of the self-stressing tensioning plate and is fixed. The other end is directly welded and fixed to the self-stressing tensioning plate. The outer sides of the self-stressing tensioning plates on the passing ends are provided with transverse external self-stressing tendons connected to the embedded tendons. Bolt holes are evenly spaced along the length direction of the longitudinal and transverse self-stressing tendons, and the steel formwork is supported and fixed to the base with tension bolts; Pour the expansive concrete and compact it with a vibrator, polish it with a grinder after raising the slurry, and finally finish it manually; After covering with curing cloth for 7 days, use a notching machine to make grooves on the top of the board.

12. The method for prefabricating a bidirectional self-stressed prefabricated panel according to claim 11, wherein: The size of the base is equal to the length and width of the bidirectional self-stressed prefabricated plate; The longitudinal length of the bidirectional self-stressed prefabricated board is 36 cm-44 cm shorter than the longitudinal side of the precut rectangle or square, the transverse side is 18 cm-22 cm shorter, and the thickness is 8 mm-10 mm thinner; the concrete grade of the bidirectional self-stressed prefabricated board is 35 MPa-40 MPa, the concrete adopts high-expansion cement concrete, and the content of high-efficiency expansion agent is 8-12%.

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