Prestress applying device for fiber gridding cloth reinforced reinforced concrete precast slab

Abstract

The invention relates to the technical field of prestressed fiber gridding cloth reinforced reinforced concrete construction, in particular to a fiber gridding cloth reinforced reinforced concrete precast slab prestress applying device which comprises a bottom die and four side dies, and the four side dies respectively comprise two test die long side plates and two test die short side plates. The bottom die and the four side dies are used for defining a test die, the number of the angle steel end plates is two, horizontal plates of the two angle steel end plates are arranged at the two ends in the test die respectively, and the angle steel end plates are fixed to the corresponding short side plates of the test die; the number of the flat steel plates is two, and the two flat steel plates are arranged at the two ends of the interior of the test mold respectively; the plurality of pressing rods are arranged in parallel and are all fixed in the test mold; a plurality of anchoring sliding blocks are arranged in parallel, and full-thread bolts with the number corresponding to that of the anchoring sliding blocks are screwed on each angle steel end plate in a threaded mode; the technical problem that the prestress of the fiber gridding cloth in the fiber gridding cloth reinforced reinforced concrete prefabricated slab cannot be applied is solved.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed fiber mesh cloth reinforced reinforced concrete construction, and in particular to a prestressing device for a fiber mesh cloth reinforced reinforced concrete prefabricated plate. Background Art

[0002] Fiber mesh cloth is made of woven fabrics such as glass fiber, carbon fiber, basalt fiber, etc. as the base material, and is formed after being soaked in a polymer anti-emulsion coating. The fiber mesh cloth has the characteristics of light weight, high strength, alkali resistance, waterproofness, corrosion resistance, and dimensional stability. Its warp and weft tensile strength exceeds 1400MPa. At present, alkali-resistant glass fiber mesh cloth has been widely used in the decoration and renovation of internal and external walls, and can effectively reduce the cracking of the wall surface.

[0003] Fiber mesh cloth reinforced cast-in-place reinforced concrete slabs, shear walls, etc. are a new type of structural component with excellent crack resistance. Fiber mesh cloth reinforced cast-in-place reinforced concrete structural components without prestressing can bear force together with structural components, which can enhance the bending stiffness of the structure, reduce structural cracks, and improve the durability of the structure to a certain extent. However, since the fiber mesh cloth and structural components in the fiber mesh cloth reinforced cast-in-place reinforced concrete structural components bear force and deform together, considering that the elastic modulus of the fiber mesh cloth is 1 / 4 to 3 / 4 of the elastic modulus of the steel bar, under the same deformation conditions, the stress of the fiber mesh cloth is only 1 / 4 to 3 / 4 of the stress of the steel bar. Therefore, under the normal use of the structural component, the stress of ordinary steel bars is much lower than the yield strength (300MPa to 500MPa), and the ultra-high strength characteristics of the fiber mesh cloth are difficult to be fully utilized.

[0004] In summary, it can be seen that applying prestress to fiber mesh cloth reinforced reinforced concrete prefabricated structural components, allowing the fiber mesh cloth to be stressed before the reinforced concrete prefabricated components, and developing prestressed fiber mesh cloth reinforced reinforced concrete prefabricated structural components are effective measures to further improve the bending stiffness, crack resistance and durability of structural components. However, there is currently no public literature report on how to apply prestress in prestressed fiber mesh cloth reinforced reinforced concrete prefabricated structural components, which has caused great inconvenience to the promotion of prestressed fiber mesh cloth reinforced reinforced concrete structural components. Summary of the invention

[0005] The invention provides a device for applying prestress of a fiber mesh cloth reinforced reinforced concrete precast plate, so as to solve the technical problem that the prestress of the fiber mesh cloth in the fiber mesh cloth reinforced reinforced concrete precast plate cannot be applied.

[0006] In order to solve the above problems, the fiber mesh cloth reinforced reinforced concrete precast slab prestressing device provided by the present invention adopts the following technical solutions: The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device comprises: The bottom mold and four side molds, the four side molds respectively include two long side plates of the test mold and two short side plates of the test mold, the bottom mold and the four side molds are used to surround the test mold, and the bottom mold is used to lay the fiber mesh cloth; There are two angle steel end plates, the horizontal plates of which are placed at the two ends of the inside of the test mold, and the vertical plates of each angle steel end plate are closely attached to the corresponding short side plate of the test mold, and the angle steel end plates are fixed to the corresponding short side plate of the test mold; Two flat steel plates are placed at two ends of the test mold, and each flat steel plate is placed on the bottom plate of the corresponding angle steel end plate after being wrapped with the end of the fiber mesh cloth; Multiple compression rods are arranged in parallel, and the multiple compression rods are fixed in the test mold, and the height of the compression rods does not exceed the thickness of the concrete cover to be poured; A plurality of anchoring sliders are arranged in parallel, the extension direction of the anchoring sliders is the same as the extension direction of the long side plate of the test mold, each angle steel end plate is threaded with full-thread bolts corresponding to the number of anchoring sliders, each full-thread bolt is threaded with one of the anchoring sliders, and the flat steel plate is located between the anchoring sliders and the angle steel end plate; Each of the anchoring sliders is used to move toward the corresponding angle steel end plate under the action of the jack, thereby driving the fiber mesh cloth on the flat steel plate to be tensioned toward both ends.

[0007] Furthermore, multiple anchoring sliders are provided with L-shaped notches at the bottom facing the corresponding angle steel end plates, and the size of the L-shaped notches corresponds to the flat steel plate for the flat steel plate to be placed therein. The anchoring sliders are used to cooperate with the flat steel plate through the L-shaped notches.

[0008] Furthermore, each full-thread bolt is provided with a nut which fits with the anchoring slider, and the nut is used to prevent the anchoring slider from moving back due to the prestress of the fiber mesh cloth after the external force is removed.

[0009] Furthermore, each full-thread bolt passes through the corresponding angle steel end plate and is screwed onto the short side plate of the test mold. The short side plate of the test mold has corresponding bolt holes to achieve the fixation of the angle steel end plate and the corresponding short side plate of the test mold.

[0010] Furthermore, each compression rod is fixed to the long side plate of the test mold by bolts.

[0011] Furthermore, it also includes a long thin aluminum plate. Before winding the fiber mesh cloth, the long thin aluminum plate is folded along the longer center line, and resin glue is applied to the upper and lower surfaces within the angle of the aluminum plate, and the two ends of the fiber mesh cloth are placed in the angle of the thin aluminum plate and pressed tightly, and then resin glue is applied to the upper surface of the outside of the aluminum plate, and a flat steel plate is placed on the upper surface of the outside of the aluminum plate, and then the fiber mesh cloth is wrapped around the flat steel plate for 3-5 times.

[0012] Furthermore, it also includes a rigid connector, which is used to simultaneously connect to multiple anchoring sliders at one end of the test mold, and the rigid connector is used to simultaneously push the multiple anchoring sliders to move when pushed by the jack.

[0013] Furthermore, the bottom upper surface of the angle steel end plate and the bottom surface of the pressure rod are smooth and have no edges or corners to prevent scratches and damage to the fiber mesh cloth.

[0014] The beneficial effects of the fiber mesh cloth reinforced reinforced concrete precast slab prestressing device provided by the present invention are: the fiber mesh cloth arranged at the bottom of the reinforced concrete precast slab can bear force together with ordinary steel bars and resist external loads together, so it can improve the bidirectional bending stiffness and bending bearing capacity of the precast slab to a certain extent, and can reduce the bidirectional cracks of the precast slab to a certain extent; by applying prestress in the fiber mesh cloth, the fiber mesh cloth is subjected to force in advance in the concrete structure, thereby increasing the bending stiffness in the direction of prestressing. The pre-tensioning force of the fiber mesh cloth can generate a certain pre-compression stress inside the concrete, which can offset the tensile stress of the concrete caused by external loads, thereby effectively delaying or reducing the generation of concrete cracks and improving the crack resistance of the structure; the application of pre-tensioning force can constrain the shrinkage and creep of the concrete, reducing the resulting shrinkage cracks and long-term deformation cracks. This helps to improve the service life of the structure; by setting angle steel pads at both ends of the prestressed fiber mesh cloth reinforced reinforced concrete precast slab, it can effectively prevent the fiber mesh from shear damage due to local pressure, and after the trial mold is removed, it can cooperate with the full-thread bolts and anchor sliders to effectively anchor the two ends of the prestressed fiber mesh cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a schematic diagram of the matching of the fiber mesh cloth and the aluminum plate in the present invention; Figure 2 It is a three-dimensional schematic diagram of a prestressing device for a fiber mesh cloth reinforced prefabricated plate according to the present invention; Figure 3 A top view of the prestressing device for the fiber mesh cloth reinforced prefabricated board of the present invention; Figure 4 It is a partial three-dimensional schematic diagram of the prestressing device for the fiber mesh cloth reinforced prefabricated plate of the present invention; Figure 5 It is a partial schematic plan view of the prestressing device for the fiber mesh cloth reinforced prefabricated plate of the present invention; Figure 6 It is a schematic diagram of the coordination of the jack, the rigid connector and the anchoring slider in the present invention.

[0016] Description of reference numerals: 1. Fiber mesh cloth; 4. Aluminum plate; 5. Flat steel plate; 6. Long side plate of test mold; 7. Short side plate of test mold; 8. Angle steel end plate; 9. Pressure rod; 10. Full-thread bolt; 11. Anchor slider; 12. Bolt; 13. Jack; 14. Rigid connector. DETAILED DESCRIPTION

[0017] 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. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] It should be noted that the main idea of ​​the present invention is that the fiber mesh cloth 1 arranged at the bottom of the reinforced concrete precast slab can bear force together with the steel bars in the reinforced concrete member and resist external loads together, so it can improve the bidirectional bending stiffness and bending bearing capacity of the precast slab to a certain extent, and reduce the bidirectional cracks of the precast slab to a certain extent; by applying prestress in the fiber mesh cloth 1, the fiber mesh cloth 1 is subjected to force in advance in the concrete structure, thereby increasing the bending stiffness in the direction of prestress application. The pre-tension of the fiber mesh cloth 1 can cause a certain pre-compression stress to be generated inside the concrete, which can offset the tensile stress of the concrete caused by external loads, thereby effectively delaying or reducing the generation of concrete cracks and improving the crack resistance of the structure; the application of pre-tension can constrain the shrinkage and creep of the concrete, reducing the resulting shrinkage cracks and long-term deformation cracks. This helps to improve the service life of the structure; by arranging angle steel pads 8 at both ends of the prestressed fiber mesh cloth reinforced reinforced concrete precast slab, it can effectively prevent the fiber mesh 1 from shear damage due to local pressure, and after the trial mold is removed, it can cooperate with the full-thread bolts 10 and the anchoring slider 11 to effectively anchor the two ends of the prestressed fiber mesh cloth 1.

[0019] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0020] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0021] Embodiments of the prestressing device for fiber mesh cloth reinforced reinforced concrete precast slab provided by the present invention: like Figures 1 to 6 As shown, a prestressing device for reinforced reinforced concrete precast panels reinforced with fiber mesh cloth comprises a bottom mold and four side molds, wherein the four side molds respectively comprise two long side plates 6 of the test mold and two short side plates 7 of the test mold, the bottom mold and the four side molds are used to enclose the test mold, and the bottom mold is used to lay the fiber mesh cloth 1; there are two angle steel end plates 8, and the horizontal plates of the two angle steel end plates 8 are respectively placed at the two ends of the inside of the test mold, and the vertical plate of each angle steel end plate 8 is close to the corresponding short side plate 7 of the test mold, and the angle steel end plates 8 are fixed to the corresponding short side plates 7 of the test mold.

[0022] It also includes two flat steel plates 5, which are placed at the two ends of the test mold, and each flat steel plate 5 is placed on the bottom plate of the corresponding angle steel end plate 8 after being wrapped with the end of the fiber mesh cloth 1; multiple parallel arranged pressure rods 9, which are fixed in the test mold, and the height of the pressure rods 9 does not exceed the thickness of the protective layer of the concrete to be poured; multiple parallel arranged anchoring sliders 11, the extension direction of the anchoring sliders 11 is the same as the extension direction of the long side plate 6 of the test mold, each angle steel end plate 8 is threaded with a number of full-thread bolts 10 corresponding to the anchoring sliders 11, and each full-thread bolt 10 is screwed with an anchoring slider 11, and the flat steel plate 5 is located between the anchoring slider 11 and the angle steel end plate 8; each of the anchoring sliders 11 is used to move toward the corresponding angle steel end plate 8 under the action of the jack 13, thereby driving the fiber mesh cloth 1 on the flat steel plate 5 to be tensioned at both ends. In this embodiment, each pressure rod 9 is fixed to the long side plate 6 of the test mold by bolts 12.

[0023] Specifically, a plurality of anchoring sliders 11 are provided with L-shaped notches at the bottom facing the corresponding angle steel end plates 8, and the size of the L-shaped notches corresponds to the flat steel plate 5, so that the flat steel plate 5 can be placed therein, and the anchoring sliders 11 are used to stop and cooperate with the flat steel plate 5 through the L-shaped notches. This effectively improves the stability of the movement of the flat steel plate 5.

[0024] In addition, each full-thread bolt 10 also has a nut that fits with the anchoring slider 11, and the nut is used to prevent the anchoring slider 11 from moving back due to the prestress of the fiber mesh cloth 1 after the external force is removed.

[0025] Regarding the arrangement of the full-thread bolts 10 , each full-thread bolt 10 passes through the corresponding angle steel end plate 8 and is screwed onto the short side plate 7 of the test mold. The short side plate 7 of the test mold has corresponding bolt holes to achieve the fixation of the angle steel end plate 8 and the corresponding short side plate 7 of the test mold.

[0026] Before winding the fiber mesh cloth 1, it is also necessary to use a long thin aluminum plate 4. The long thin aluminum plate 4 is folded in half along the longer center line, and resin glue is applied to the upper and lower surfaces within the angle of the aluminum plate 4. The two ends of the fiber mesh cloth 1 are placed in the angle of the thin aluminum plate 4 and pressed tightly. Then, resin glue is applied to the upper surface of the outside of the aluminum plate 4, and the flat steel plate 5 is placed on the upper surface of the outside of the aluminum plate 4, and then the fiber mesh cloth 1 is wrapped around the flat steel plate 5 for 3-5 turns.

[0027] The multiple anchoring sliders 11 at one end of the test mold are connected by a rigid connector 14 , and the rigid connector 14 is used to simultaneously push the multiple anchoring sliders 11 to move when pushed by the jack 13 .

[0028] About the selection of the angle steel end plate 8. The bottom upper surface of the angle steel end plate 8 and the bottom surface of the pressure rod 9 are smooth and have no edges and corners to prevent scratches and damage to the fiber mesh cloth 1.

[0029] The working principle of the prestressing device for fiber mesh cloth reinforced reinforced concrete prefabricated slab provided by the present invention is: S1: Assemble the bottom form and four-side side forms of the prestressed fiber mesh cloth reinforced reinforced concrete precast slab to form a test mold, place the horizontal plates of the two angle steel end plates 8 at the two ends of the inside of the test mold, and ensure that the vertical plates of the angle steel end plates 8 are close to the short side mold of the test mold, and then use full-thread bolts 10 to fix the angle steel end plates 8 to the short side mold of the test mold; S2: Horizontally spread the fiber mesh cloth 1 on the upper surface of the test mold bottom plate, wrap the two ends of the fiber mesh cloth 1 around the flat steel plate 5 respectively, and then place the flat steel plate 5 wrapped with the fiber mesh cloth 1 on the bottom plate of the angle steel end plate 8, and keep the flat steel plate 5 parallel to the angle steel end plate 8; S3: insert the full-thread bolt 10 with the nut into the bolt hole of the anchor slider 11, place the anchor slider 11 with the full-thread bolt 10 on the flat steel plate 5, and use the L-shaped notch of the anchor slider 11 to clamp the flat steel plate 5, and then screw the screw of the bolt 12 into the threaded hole of the vertical plate of the angle steel end plate 8; S4: Use bolts 12 to fix the two ends of the pressure rod 9 to the two long side plates of the test mold respectively, and the height of the pressure rod 9 does not exceed the thickness of the protective layer of the concrete to be poured; S5: Apply external force to all the anchoring sliders 11 at both ends of the test mold at the same time. After being stressed, the anchoring sliders 11 slide toward both ends along the full-thread bolts 10, thereby driving the fiber mesh cloth 1 to be tensioned toward both ends. When the prestress in the fiber mesh cloth 1 reaches the design value, tighten the nuts on the full-thread bolts 10 to press against the anchoring sliders 11 to prevent the anchoring sliders 11 from moving back due to the prestress of the fiber mesh cloth 1 after the external force is removed.

[0030] S6: placing ordinary bidirectional steel mesh 3, pouring concrete, tamping and vibrating, and after curing to the designed strength, removing the test mold to form a prestressed fiber mesh cloth 1 reinforced reinforced concrete precast slab.

[0031] In S1, there are at least two rows of threaded holes on the vertical plate of the angle steel end plate 8, at least one row of threaded holes is completely aligned with the bolt holes of the short side mold of the test mold, and at least another row of threaded holes is completely aligned with the bolt holes of the anchoring slider 11, ensuring that the angle steel end plate 8 can be fixed to the short side mold of the test mold and the anchoring slider 11 at the same time.

[0032] In S2, before winding the fiber mesh cloth 1, a long thin aluminum plate 4 is prepared in advance, and then folded along the longer center line, and resin glue is applied to the upper and lower surfaces within the angle of the aluminum plate 4, and the two ends of the fiber mesh cloth 1 are placed in the angle of the thin aluminum plate 4 and pressed tightly, and then resin glue is applied to the upper surface of the outside of the aluminum plate 4, and the flat steel plate 5 is placed on the upper surface of the outside of the aluminum plate 4, and then the fiber mesh cloth 1 is wrapped around the flat steel plate 5 for 3-5 turns.

[0033] In S3, the nut and the hexagonal head of the full-thread bolt 10 are located on the same side of the anchoring slider 11; In S5, before applying external force to the anchoring slider 11, two rigid connectors 14 can be made in advance, one end of the connector can be matched and tightened with all the anchoring sliders 11 on the same side, and the other end of the connector can be matched and connected with the jack 13; then the jack 13 can be placed in the middle of the test mold, and the end of the jack 13 can be connected to the anchoring slider 11 on the same side through the rigid connector 14; finally, the jack 13 can be used to apply external force to the anchoring slider 11, and the anchoring slider 11 slides toward both ends along the full-thread bolts 10 fixed on the angle steel side plate, thereby driving the fiber mesh cloth 1 to be tensioned toward both ends.

[0034] The fiber mesh cloth 1 can be a fiber mesh cloth 1 with a grid, or a fiber cloth. The fiber can be one or more of glass fiber, carbon fiber, aramid fiber or basalt fiber, and the tensile strength of the fiber is not less than 2000 MPa.

[0035] The side mold, bottom mold and pressure rod 9 of the test mold are all very rigid and deform very little after being subjected to force.

[0036] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0037] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A fiber mesh cloth reinforced reinforced concrete precast slab prestressing device, characterized in that: include: The bottom mold and four side molds, the four side molds respectively include two long side plates of the test mold and two short side plates of the test mold, the bottom mold and the four side molds are used to surround the test mold, and the bottom mold is used to lay the fiber mesh cloth; There are two angle steel end plates, the horizontal plates of which are placed at the two ends of the inside of the test mold, and the vertical plates of each angle steel end plate are closely attached to the corresponding short side plate of the test mold, and the angle steel end plates are fixed to the corresponding short side plate of the test mold; Two flat steel plates are placed at two ends of the test mold, and each flat steel plate is placed on the bottom plate of the corresponding angle steel end plate after being wrapped with the end of the fiber mesh cloth; Multiple compression rods are arranged in parallel, and the multiple compression rods are fixed in the test mold, and the height of the compression rods does not exceed the thickness of the concrete cover to be poured; A plurality of anchoring sliders are arranged in parallel, the extension direction of the anchoring sliders is the same as the extension direction of the long side plate of the test mold, each angle steel end plate is threaded with full-thread bolts corresponding to the number of anchoring sliders, each full-thread bolt is threaded with one of the anchoring sliders, and the flat steel plate is located between the anchoring sliders and the angle steel end plate; Each of the anchoring sliders is used to move toward the corresponding angle steel end plate under the action of the jack, thereby driving the fiber mesh cloth on the flat steel plate to be tensioned toward both ends.

2. The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device according to claim 1 is characterized in that: Multiple anchoring sliders are provided with L-shaped notches at the bottom facing the corresponding angle steel end plates. The size of the L-shaped notches corresponds to the flat steel plates for the flat steel plates to be placed in. The anchoring sliders are used to cooperate with the flat steel plates through the L-shaped notches.

3. The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device according to claim 2 is characterized in that: Each full-thread bolt is also provided with a nut which fits with the anchoring slider, and the nut is used to prevent the anchoring slider from moving back due to the prestress of the fiber mesh cloth after the external force is removed.

4. The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device according to any one of claims 1 to 3, characterized in that: Each full-thread bolt passes through the corresponding angle steel end plate and is screwed onto the short side plate of the test mold. The short side plate of the test mold has corresponding bolt holes to fix the angle steel end plate to the corresponding short side plate of the test mold.

5. The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device according to any one of claims 1 to 3, characterized in that: Each pressure rod is fixed to the long side plate of the test mold by bolts.

6. The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device according to any one of claims 1 to 3, characterized in that: It also includes a long thin aluminum plate. Before winding the fiber mesh cloth, the long thin aluminum plate is folded along the longer center line, and resin glue is applied to the upper and lower surfaces within the angle of the aluminum plate, and the two ends of the fiber mesh cloth are placed in the angle of the thin aluminum plate and pressed tightly, and then resin glue is applied to the upper surface of the outside of the aluminum plate, and a flat steel plate is placed on the upper surface of the outside of the aluminum plate, and then the fiber mesh cloth is wrapped around the flat steel plate for 3-5 turns.

7. The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device according to any one of claims 1 to 3, characterized in that: It also includes a rigid connector, which is used to simultaneously connect to multiple anchoring sliders at one end of the test mold, and the rigid connector is used to simultaneously push the multiple anchoring sliders to move when pushed by the jack.

8. The fiber mesh cloth reinforced reinforced concrete precast slab prestressing device according to any one of claims 1 to 3, characterized in that: The bottom upper surface of the angle steel end plate and the bottom surface of the pressure rod are both smooth and have no edges or corners to prevent the fiber mesh cloth from being scratched and damaged.

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