Post-cast strip concrete blocking net sealing device

Abstract

The invention belongs to the technical field of building structure construction, and particularly relates to a post-cast strip concrete blocking net sealing device. The post-cast strip reserved on the building structure foundation is subjected to chiseling cleaning, exposed steel bars of anchoring rods are subjected to rust removal, the inner side wall of the post-cast strip is coated with an adhesion agent or cement paste, and a blocking net sealing device is assembled in the post-cast strip. Anti-seepage and anti-freezing shrinkage-compensating concrete with the grade higher than that of the original concrete is poured from the position above the blocking net sealing device, and pouring and curing are conducted for 28 days after 42 days; by arranging the protruding parts protruding inwards in the middles of the two side walls of the post-cast strip and additionally arranging the anchoring rods on the upper portions and the lower portions of the two side walls of the post-cast strip, the connection reliability between interfaces after pouring can be greatly improved, and the situation that weak parts are formed due to cracks caused by the new concrete problem and the old concrete problem is effectively avoided; the blocking net sealing device is reasonable in structural design, reliable outer support is provided for the blocking net, the side impact prevention performance is good, and the pouring quality can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure construction, and in particular relates to a post-cast zone concrete screen closing device. Background Art

[0002] Post-cast strips are concrete strips set aside at the corresponding positions of the foundation slab, wall, and beam in accordance with the design or construction specifications to prevent harmful cracks that may occur in reinforced concrete structures due to uneven shrinkage or uneven settlement. Post-cast strips temporarily divide the structure into several parts. After the internal shrinkage of the components, the construction joint concrete is poured again after a period of time to connect the structure into a whole. The pouring time of the post-cast strip should be selected when the temperature is relatively low. Cement or concrete with a trace amount of aluminum powder added to cement can be poured. Its strength grade should be one level higher than the strength of the component to prevent cracks between the new and old concrete and form weak parts. The location of the post-cast strip should also consider the different consumption factors of formwork and other measures. During the concrete pouring construction process where the post-cast strip needs to be left, once the post-cast strip leaks, it is very troublesome to clean up, which is not only time-consuming and labor-intensive, but also affects the quality of the project.

[0003] For this purpose, a post-cast strip concrete screen closure device is disclosed in the patent specification with publication number CN110485610A, including a left screen closure device and a right screen closure device arranged on both sides of the post-cast strip. The left and right screen closure devices have the same structure, including an upper and lower clamping seat and a steel mesh installed between the upper and lower clamping seats; the upper and lower clamping seats have the same structure and are installed facing each other, or are N independent clamping seats connected end to end, or are N independent clamping seats connected end to end and a special clamping seat, the length of the independent clamping seat is twice the spacing of the floor reinforcement, the cross-section of the independent clamping seat is an isosceles trapezoid, the width of its installation surface is less than or equal to 80mm, and a skeleton groove and two inner grooves are provided on the installation surface. The installation construction method includes off-site production of independent clamping seats and steel mesh frames, and sequentially installing the lower clamping seat, the steel mesh frame, the upper clamping seat, pouring the floor concrete, and pouring the post-cast strip. The screen closure device has a simple structure, light weight, is easy to store and carry, is easy to install, has high construction efficiency, and can effectively intercept concrete and prevent slurry from running.

[0004] However, this post-cast concrete mesh closure device still has some shortcomings. First, after pouring, cracks easily appear on the interface due to the problem of new and old concrete, forming a weak point; second, there is no effective support system inside the mesh, and the side pressure of the concrete during pouring easily causes the formwork to deform. Therefore, it needs to be optimized and improved. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems existing in the traditional technology and provide a post-cast zone concrete barrier closure device.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a post-cast strip concrete mesh closure device, which is arranged in a post-cast strip reserved in a building structure foundation, and a protrusion protruding inward is provided in the middle of two side walls of the post-cast strip, and a plurality of exposed anchor rods are evenly distributed on the upper and lower parts of the two side walls of the post-cast strip; the mesh closure device comprises a plurality of equidistantly distributed mesh frames, the inner sides of all the mesh frames are paved with meshes, grille support members are installed inside the mesh frames, and two supporting oblique rods distributed along the diagonal of the rectangular parallelepiped are welded between two adjacent mesh frames.

[0008] Furthermore, in the above-mentioned post-cast strip concrete mesh closure device, the opening width of the post-cast strip is 800mm to 1200mm, and the length is 30m to 300m.

[0009] Furthermore, in the above-mentioned post-cast strip concrete mesh closure device, the cross-section of the raised portion is an isosceles trapezoidal structure.

[0010] Furthermore, in the above-mentioned post-cast strip concrete mesh closure device, the mesh frame includes a frame body that matches the cross-sectional shape of the post-cast strip, both sides of the frame body are provided with inner recesses that match the raised portions, and the inner side wall of the frame body is provided with snap-in holes that are convenient for installing a grid support.

[0011] Furthermore, in the above-mentioned post-cast strip concrete mesh closing device, the grid support member includes a plurality of transverse support rods and a plurality of vertical support rods, and both ends of the transverse support rods and the vertical support rods can be snapped into corresponding snap-in holes.

[0012] Furthermore, in the above-mentioned post-cast zone concrete mesh closing device, the mesh is composed of a first stainless steel wire mesh located at the bottom and a second stainless steel wire mesh located at both sides thereof.

[0013] Furthermore, in the above-mentioned post-cast strip concrete mesh closure device, the first stainless steel wire mesh and the second stainless steel wire meshes on both sides are an integrated structure or a split structure.

[0014] Furthermore, in the above-mentioned post-cast strip concrete mesh closure device, the middle parts of the two supporting diagonal rods are also fixed to each other by welding.

[0015] Furthermore, in the above-mentioned post-cast concrete barrier closure device, the material of the mesh frame is high-strength low-carbon cast steel, which includes, by mass percentage: C 0.14% to 0.18%, Si 0.54% to 0.56%, Mn 1.25% to 1.35%, Cr 0.25% to 0.35%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-strength low-carbon cast steel has a yield strength of ≥320MPa, a tensile strength of ≥460MPa, an elongation of ≥20%, a cross-sectional shrinkage of ≥32%, and an AKv of ≥32J at -40°C;

[0016] The method for preparing the grid frame comprises the following steps:

[0017] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0018] 2) heating the molten steel to 1600° C. to 1650° C., adding 0.10% to 0.20% of aluminum by mass of the molten steel for deoxidation, and then adding a silicon-calcium series modifier to the molten steel, and casting at a temperature not exceeding 1550° C.;

[0019] 4) The casting obtained by casting is heated from room temperature to 930°C to 940°C, kept warm for 3h to 5h, water quenched, and then tempered at 260°C to 280°C for 2 to 4h to obtain a cast steel part.

[0020] Furthermore, in the above-mentioned post-casting belt concrete barrier closure device, the material of the grid support member and the supporting diagonal rod is high-toughness low-carbon cast steel, which includes, by mass percentage: C 0.10%-0.25%, Si 0.65%-1.25%, Mn 0.55%-1.25%, Cr 0.55%-1.25%, Mo 0.15%-0.25%, V 0.15%-0.25%, Ni 0.15%-0.30%, Cu 0.15%-0.25%, Ca 0.05%-0.10%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the tensile strength of the high-toughness low-carbon cast steel is 1450-1550MPa, and AKv≥32J at -40°C;

[0021] The method for preparing the grid support member and the supporting diagonal rod comprises the following steps:

[0022] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0023] 2) heating the molten steel to 1600° C. to 1650° C., adding 0.10% to 0.20% of aluminum by mass of the molten steel for deoxidation, and then adding a silicon-calcium series modifier to the molten steel, and casting at a temperature not exceeding 1550° C.;

[0024] 3) The casting obtained by casting is heated from room temperature to 930°C to 940°C, kept warm for 3h to 5h, water quenched, and then tempered at 260°C to 280°C for 2 to 4h to obtain a cast steel part.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention performs roughening and cleaning of the post-cast strip reserved for the building structure foundation, removes rust from the exposed steel bars of the anchor rod, applies interface agent or cement slurry to the inner wall of the post-cast strip, assembles a screen closure device inside the post-cast strip, pours and casts anti-seepage, anti-freezing and shrinkage compensating concrete with a higher grade than the original concrete from the top of the screen closure device, and performs pouring and curing for 28 days after 42 days; by providing an inwardly protruding protrusion in the middle of both side walls of the post-cast strip, and adding anchor rods to the upper and lower parts of both side walls of the post-cast strip, the connection reliability between the interfaces after pouring can be greatly improved, and the occurrence of weak parts caused by cracks due to problems with new and old concrete can be effectively avoided.

[0027] 2. The structural design of the mesh closing device of the present invention is reasonable, including a number of equidistantly distributed mesh frames, the inner sides of all the mesh frames are paved with meshes, grille support members are installed inside the mesh frames, and two supporting diagonal bars distributed along the diagonals of the rectangular bodies are welded between two adjacent mesh frames. The mesh frames with built-in supporting diagonal bars can provide reliable external support for the meshes, and the supporting diagonal bars can be used to improve the ability of the mesh frames to prevent side impacts, thereby ensuring the casting quality.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the position of the post-casting strip in the present invention;

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of the blocking and closing device in the present invention;

[0032] Figure 3 It is a schematic diagram of the main structure of the blocking and closing device in the present invention;

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the blocking net in the present invention;

[0034] Figure 5This is a schematic diagram of the main structure of the blocking net in the present invention;

[0035] Figure 6 It is a schematic diagram of the assembly of the grid frame, the grid support member, and the supporting diagonal rod in the present invention;

[0036] Figure 7 It is a structural schematic diagram of the network frame in the present invention;

[0037] Figure 8 It is a schematic structural diagram of the grid support member in the present invention;

[0038] In the accompanying drawings, the reference numerals of the various components are as follows:

[0039] 1-building structure foundation, 2-post-cast strip, 3-raised part, 4-anchor rod, 5-grid frame, 501-frame, 502-recessed part, 503-clamping hole, 6-net, 601-first stainless steel wire net, 602-second stainless steel wire net, 7-grating support, 8-support diagonal rod. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1

[0042] like Figure 1-Figure 8 As shown, this embodiment provides a post-cast strip concrete mesh closure device, which is arranged in a post-cast strip 2 reserved in a building structure foundation 1, and a protrusion 3 protruding inward is provided in the middle of the two side walls of the post-cast strip 2, and the cross-section of the protrusion 3 is an isosceles trapezoidal structure. A number of exposed anchor rods 4 are evenly distributed on the upper and lower parts of the two side walls of the post-cast strip 2. The mesh closure device includes a number of equidistantly distributed mesh frames 5, and the inner sides of all the mesh frames 5 are paved with meshes 6. A grid support 7 is installed inside the mesh frame 5, and two supporting diagonal rods 8 distributed along the diagonal of the rectangular parallelepiped are welded between two adjacent mesh frames 5, and the middle parts of the two supporting diagonal rods 8 are also fixed to each other by welding.

[0043] In this embodiment, the opening width of the post-cast strip is 800 mm and the length is 30 m.

[0044] In this embodiment, the grid frame 5 includes a frame body 501 that matches the cross-sectional shape of the post-cast strip 2, and inner recesses 502 that match the protrusions 3 are provided on both sides of the frame body 501. The inner wall of the frame body 501 is provided with snap-in holes 503 that facilitate the installation of the grid support 7.

[0045] In this embodiment, the grille support member 7 includes a plurality of transverse support rods and a plurality of vertical support rods, and both ends of the transverse support rods and the vertical support rods can be snapped into the corresponding snap-in holes 503 .

[0046] In this embodiment, the net 6 is composed of a first stainless steel wire net 601 located at the bottom and a second stainless steel wire net 602 located on both sides thereof. The first stainless steel wire net 601 and the second stainless steel wire nets 602 on both sides are an integrated structure. The first stainless steel wire net 601 and the second stainless steel wire nets 602 on both sides are tied and fixed to each mesh frame 5 by metal binding wires.

[0047] In this embodiment, the material of the grid frame is high-strength low-carbon cast steel, which includes, by mass percentage, C0.14%, Si 0.54%, Mn 1.25%, Cr 0.25%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-strength low-carbon cast steel has a yield strength of ≥320MPa, a tensile strength of ≥460MPa, an elongation of ≥20%, a cross-sectional shrinkage of ≥32%, and an AKv of ≥32J at -40°C;

[0048] The preparation method of the grid frame comprises the following steps:

[0049] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0050] 2) heating the molten steel to 1600°C, adding 0.10% aluminum by weight of the molten steel for deoxidation, then adding a silicon-calcium based modifier to the molten steel, and casting at a temperature not exceeding 1550°C;

[0051] 4) The casting obtained by casting is heated from room temperature to 930°C, kept at this temperature for 5 hours, water quenched, and then tempered at 260°C for 4 hours to obtain a cast steel part.

[0052] In this embodiment, the material of the grid support member and the supporting diagonal rod is high-toughness low-carbon cast steel, which includes, by mass percentage: C 0.10%, Si 0.65%, Mn 0.55%, Cr 0.55%, Mo 0.15%, V 0.15%, Ni0.15%, Cu 0.15%, Ca 0.05%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-toughness low-carbon cast steel has a tensile strength of 1450-1550MPa, and AKv≥32J at -40°C;

[0053] The method for preparing the grid support member and the supporting diagonal rod comprises the following steps:

[0054] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0055] 2) heating the molten steel to 1600°C, adding 0.10% aluminum by weight of the molten steel for deoxidation, then adding a silicon-calcium based modifier to the molten steel, and casting at a temperature not exceeding 1550°C;

[0056] 4) The casting obtained by casting is heated from room temperature to 930°C, kept at this temperature for 5 hours, water quenched, and then tempered at 260°C for 4 hours to obtain a cast steel part.

[0057] The specific application of this embodiment is:

[0058] The post-cast strip 2 reserved for the building structure foundation 1 is roughened and cleaned, the exposed steel bars of the anchor rod 4 are rust-removed, the inner wall of the post-cast strip 2 is coated with an interface agent or cement slurry, and the assembly of the blocking and closing device is performed inside the post-cast strip 2; during assembly, each mesh frame 5 is first fixed in the post-cast strip 2, and then the blocking net 6 is laid on the inner side of the mesh frame 5, so that the exposed steel bars of the anchor rod 4 can pass through the mesh holes of the corresponding blocking net 6 during laying, and then a grid support 7 is added to the inside of the mesh frame 5, and the end of the grid support 7 is bent by using its own toughness and then inserted into the corresponding clamping hole 503 by using the deformation recovery force, so that the end of the grid support 7 passes through the mesh holes of the corresponding blocking net 6 during clamping, and then the support diagonal rod 8 is welded and installed on two adjacent mesh frames 5, and the assembly of the blocking and closing device is completed. The anti-seepage and anti-freezing compensating shrinkage concrete with a higher grade than the original concrete is poured from the top of the blocking and closing device, and poured and cured for 28 days after 42 days.

[0059] Embodiment 2

[0060] like Figure 1-Figure 8 As shown, this embodiment provides a post-cast strip concrete mesh closure device, which is arranged in a post-cast strip 2 reserved in a building structure foundation 1, and a protrusion 3 protruding inward is provided in the middle of the two side walls of the post-cast strip 2, and the cross-section of the protrusion 3 is an isosceles trapezoidal structure. A number of exposed anchor rods 4 are evenly distributed on the upper and lower parts of the two side walls of the post-cast strip 2. The mesh closure device includes a number of equidistantly distributed mesh frames 5, and the inner sides of all the mesh frames 5 are paved with meshes 6. A grid support 7 is installed inside the mesh frame 5, and two supporting diagonal rods 8 distributed along the diagonal of the rectangular parallelepiped are welded between two adjacent mesh frames 5, and the middle parts of the two supporting diagonal rods 8 are also fixed to each other by welding.

[0061] In this embodiment, the opening width of the post-cast strip is 1000 mm and the length is 100 m.

[0062] In this embodiment, the grid frame 5 includes a frame body 501 that matches the cross-sectional shape of the post-cast strip 2, and inner recesses 502 that match the protrusions 3 are provided on both sides of the frame body 501. The inner wall of the frame body 501 is provided with snap-in holes 503 that facilitate the installation of the grid support 7.

[0063] In this embodiment, the grille support member 7 includes a plurality of transverse support rods and a plurality of vertical support rods, and both ends of the transverse support rods and the vertical support rods can be snapped into the corresponding snap-in holes 503 .

[0064] In this embodiment, the net 6 is composed of a first stainless steel wire net 601 located at the bottom and a second stainless steel wire net 602 located on both sides thereof. The first stainless steel wire net 601 and the second stainless steel wire nets 602 on both sides are split structures. The first stainless steel wire net 601 and the second stainless steel wire nets 602 on both sides are tied and fixed to each mesh frame 5 by metal binding wires.

[0065] In this embodiment, the material of the grid frame is high-strength low-carbon cast steel, which includes, by mass percentage, C0.16%, Si 0.55%, Mn 1.30%, Cr 0.30%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-strength low-carbon cast steel has a yield strength of ≥320MPa, a tensile strength of ≥460MPa, an elongation of ≥20%, a cross-sectional shrinkage of ≥32%, and an AKv of ≥32J at -40°C;

[0066] The preparation method of the grid frame comprises the following steps:

[0067] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0068] 2) heating the molten steel to 1630°C, adding 0.15% aluminum by weight of the molten steel for deoxidation, then adding a silicon-calcium based modifier to the molten steel, and casting at a temperature not exceeding 1550°C;

[0069] 4) The casting obtained by casting is heated from room temperature to 935°C, kept at this temperature for 4 hours, water quenched, and then tempered at 270°C for 3 hours to obtain a steel casting.

[0070] In this embodiment, the material of the grid support member and the supporting diagonal rod is high-toughness low-carbon cast steel, which includes, by mass percentage, C 0.15%, Si 0.85%, Mn 0.95%, Cr 0.85%, Mo 0.20%, V 0.20%, Ni0.20%, Cu 0.20%, Ca 0.08%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-toughness low-carbon cast steel has a tensile strength of 1500MPa, and AKv≥32J at -40°C;

[0071] The method for preparing the grid support member and the supporting diagonal rod comprises the following steps:

[0072] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0073] 2) heating the molten steel to 1630°C, adding 0.15% aluminum by weight of the molten steel for deoxidation, then adding a silicon-calcium based modifier to the molten steel, and casting at a temperature not exceeding 1550°C;

[0074] 4) The casting obtained by casting is heated from room temperature to 935°C, kept at this temperature for 4 hours, water quenched, and then tempered at 270°C for 3 hours to obtain a steel casting.

[0075] Embodiment 3

[0076] like Figure 1-Figure 8 As shown, this embodiment provides a post-cast strip concrete mesh closure device, which is arranged in a post-cast strip 2 reserved in a building structure foundation 1, and a protrusion 3 protruding inward is provided in the middle of the two side walls of the post-cast strip 2, and the cross-section of the protrusion 3 is an isosceles trapezoidal structure. A number of exposed anchor rods 4 are evenly distributed on the upper and lower parts of the two side walls of the post-cast strip 2. The mesh closure device includes a number of equidistantly distributed mesh frames 5, and the inner sides of all the mesh frames 5 are paved with meshes 6. A grid support 7 is installed inside the mesh frame 5, and two supporting diagonal rods 8 distributed along the diagonal of the rectangular parallelepiped are welded between two adjacent mesh frames 5, and the middle parts of the two supporting diagonal rods 8 are also fixed to each other by welding.

[0077] In this embodiment, the opening width of the post-cast strip is 1200 mm and the length is 300 m.

[0078] In this embodiment, the grid frame 5 includes a frame body 501 that matches the cross-sectional shape of the post-cast strip 2, and inner recesses 502 that match the protrusions 3 are provided on both sides of the frame body 501. The inner wall of the frame body 501 is provided with snap-in holes 503 that facilitate the installation of the grid support 7.

[0079] In this embodiment, the grille support member 7 includes a plurality of transverse support rods and a plurality of vertical support rods, and both ends of the transverse support rods and the vertical support rods can be snapped into the corresponding snap-in holes 503 .

[0080] In this embodiment, the net 6 is composed of a first stainless steel wire net 601 located at the bottom and a second stainless steel wire net 602 located on both sides thereof. The first stainless steel wire net 601 and the second stainless steel wire nets 602 on both sides are split structures. The first stainless steel wire net 601 and the second stainless steel wire nets 602 on both sides are tied and fixed to each mesh frame 5 by metal binding wires.

[0081] In this embodiment, the material of the grid frame is high-strength low-carbon cast steel, which includes, by mass percentage, C0.18%, Si 0.56%, Mn 1.35%, Cr 0.35%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-strength low-carbon cast steel has a yield strength of ≥320MPa, a tensile strength of ≥460MPa, an elongation of ≥20%, a cross-sectional shrinkage of ≥32%, and an AKv of ≥32J at -40°C;

[0082] The preparation method of the grid frame comprises the following steps:

[0083] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0084] 2) heating the molten steel to 1650°C, adding 0.20% aluminum by weight of the molten steel for deoxidation, then adding a silicon-calcium based modifier to the molten steel, and casting at a temperature not exceeding 1550°C;

[0085] 4) The casting obtained by casting is heated from room temperature to 940°C, kept warm for 3 hours, water quenched, and then tempered at 280°C for 2 hours to obtain a cast steel part.

[0086] In this embodiment, the material of the grid support member and the supporting diagonal rod is high-toughness low-carbon cast steel, which includes, by mass percentage: C 0.25%, Si 1.25%, Mn 1.25%, Cr 1.25%, Mo 0.25%, V 0.25%, Ni0.30%, Cu 0.25%, Ca 0.10%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-toughness low-carbon cast steel has a tensile strength of 1550MPa, and AKv≥32J at -40°C;

[0087] The method for preparing the grid support member and the supporting diagonal rod comprises the following steps:

[0088] 1) Mix the metal raw materials and heat and melt them in an electric arc furnace;

[0089] 2) heating the molten steel to 1650°C, adding 0.20% aluminum by weight of the molten steel for deoxidation, then adding a silicon-calcium based modifier to the molten steel, and casting at a temperature not exceeding 1550°C;

[0090] 4) The casting obtained by casting is heated from room temperature to 940°C, kept warm for 3 hours, water quenched, and then tempered at 280°C for 2 hours to obtain a cast steel part.

[0091] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A post-cast concrete screen closure device, characterized in that: The mesh enclosing device is arranged in a post-cast strip reserved in the foundation of the building structure, and a protrusion protruding inward is provided in the middle of both side walls of the post-cast strip, and a number of exposed anchor rods are evenly distributed on the upper and lower parts of both side walls of the post-cast strip; the mesh enclosing device includes a number of equidistantly distributed mesh frames, and the inner sides of all the mesh frames are paved with meshes together, and grille support members are installed inside the mesh frames, and two supporting diagonal rods distributed along the diagonal of the rectangular parallelepiped are welded between two adjacent mesh frames.

2. The post-cast zone concrete screen sealing device according to claim 1 is characterized in that: The opening width of the post-casting strip is 800mm-1200mm, and the length is 30m-300m.

3. The post-cast zone concrete screen sealing device according to claim 1 is characterized in that: The cross section of the raised portion is an isosceles trapezoidal structure.

4. The post-cast zone concrete screen sealing device according to claim 1 is characterized in that: The grid-carrying frame comprises a frame body matched with the cross-sectional shape of the post-casting strip, inner recesses matched with the protrusions are arranged on both sides of the frame body, and a clamping hole for facilitating the installation of a grid support is opened on the inner side wall of the frame body.

5. The post-cast zone concrete screen sealing device according to claim 4 is characterized in that: The grid support member comprises a plurality of transverse support rods and a plurality of vertical support rods, and the two ends of the transverse support rods and the vertical support rods can be snapped into corresponding snap-in holes.

6. The post-cast zone concrete screen sealing device according to claim 4 is characterized in that: The fence is composed of a first stainless steel wire fence located at the bottom and a second stainless steel wire fence located at both sides thereof.

7. The post-cast zone concrete screen sealing device according to claim 6 is characterized in that: The first stainless steel wire fence and the second stainless steel wire fences on both sides are an integrated structure or a split structure.

8. The post-cast zone concrete screen sealing device according to claim 6 is characterized in that: The middle parts of the two supporting oblique rods are also fixed to each other by welding.

9. The post-cast zone concrete screen sealing device according to claim 1, characterized in that: The material of the grid frame is high-strength low-carbon cast steel, which includes, by mass percentage, C 0.14% to 0.18%, Si 0.54% to 0.56%, Mn 1.25% to 1.35%, Cr 0.25% to 0.35%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-strength low-carbon cast steel has a yield strength of ≥320MPa, a tensile strength of ≥460MPa, an elongation of ≥20%, a cross-sectional shrinkage of ≥32%, and an AKv of ≥32J at -40°C; The method for preparing the grid frame comprises the following steps: 1) Mix the metal raw materials and heat and melt them in an electric arc furnace; 2) heating the molten steel to 1600° C. to 1650° C., adding 0.10% to 0.20% of aluminum by mass of the molten steel for deoxidation, and then adding a silicon-calcium series modifier to the molten steel, and casting at a temperature not exceeding 1550° C.; 4) The casting obtained by casting is heated from room temperature to 930°C to 940°C, kept warm for 3h to 5h, water quenched, and then tempered at 260°C to 280°C for 2h to 4h to obtain a cast steel part.

10. The post-cast zone concrete screen sealing device according to claim 6, characterized in that: The grid support members and the supporting diagonal rods are made of high-toughness low-carbon cast steel, which includes, by mass percentage, C 0.10%-0.25%, Si 0.65%-1.25%, Mn 0.55%-1.25%, Cr 0.55%-1.25%, Mo 0.15%-0.25%, V 0.15%-0.25%, Ni 0.15%-0.30%, Cu 0.15%-0.25%, Ca 0.05%-0.10%, P≤0.025%, S≤0.025%, and the balance is iron and other unavoidable impurity elements; the high-toughness low-carbon cast steel has a tensile strength of 1450MPa-1550MPa, and AKv≥32J at -40°C; The method for preparing the grid support member and the supporting diagonal rod comprises the following steps: 1) Mix the metal raw materials and heat and melt them in an electric arc furnace; 2) heating the molten steel to 1600° C. to 1650° C., adding 0.10% to 0.20% of aluminum by mass of the molten steel for deoxidation, and then adding a silicon-calcium series modifier to the molten steel, and casting at a temperature not exceeding 1550° C.; 3) The casting obtained by casting is heated from room temperature to 930°C to 940°C, kept warm for 3h to 5h, water quenched, and then tempered at 260°C to 280°C for 2h to 4h to obtain a cast steel part.

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