CN113459274B - Manufacturing method of fiber woven mesh reinforced concrete composite board - Google Patents
Manufacturing method of fiber woven mesh reinforced concrete composite board Download PDFInfo
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- CN113459274B CN113459274B CN202110809241.0A CN202110809241A CN113459274B CN 113459274 B CN113459274 B CN 113459274B CN 202110809241 A CN202110809241 A CN 202110809241A CN 113459274 B CN113459274 B CN 113459274B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a method for manufacturing a fiber woven mesh reinforced concrete composite board, which comprises the following steps: firstly, dipping a fiber woven net; step two, flattening the end part of the fiber bundle; step three, pre-tensioning each fiber bundle to ensure that the pre-tensioning force borne by each fiber bundle is the same; simultaneously tensioning all the clamps until all the fiber woven meshes reach a preset tension; each fiber bundle has the same pretensioning force; and fifthly, pouring cement-based materials into the stretched fiber woven mesh, maintaining the cement-based materials for 28 days under standard maintenance conditions, and shearing the fiber woven mesh to obtain the fiber woven mesh reinforced concrete composite board. The invention can effectively solve the problem of uneven pretension force of each fiber bundle in the carbon fiber woven net by realizing the anchoring of single fiber bundles and adjusting the initial tension stress on each fiber bundle, and improves the integral preset tension force of the fiber woven net.
Description
Technical Field
The invention belongs to the field of buildings, and particularly relates to a manufacturing method of a fiber woven mesh reinforced concrete composite board.
Background
The prestressed plate is adopted for reinforcement, so that the performance of the material can be fully exerted, and compared with a composite plate without prestress, the friction bonding between the fiber woven mesh and a concrete matrix can be improved, and the interface performance between the fiber woven mesh and the concrete matrix is improved. Meanwhile, after the prestress is applied, the crack development mechanism of the plate can be delayed, the crack load of the plate is improved, the cracks of the plate are finer, and the cracking resistance, the permeability resistance and the corrosion resistance of the plate are improved.
However, when the existing carbon fiber woven mesh reinforced concrete composite board is manufactured, the whole woven mesh is integrally tensioned, and the thickness of the whole woven mesh is different, so that the tension force applied to each fiber bundle on the mesh after tensioning is not equal, even the difference is large, the prestress of the carbon fiber woven mesh is unbalanced, and the carbon fiber woven mesh reinforced concrete composite board is difficult to reach the preset strength.
Disclosure of Invention
In order to solve the problems, the invention provides a method for manufacturing a fiber woven mesh reinforced concrete composite board, which can effectively solve the problem of non-uniform prestress in the prestress application process of the carbon fiber woven mesh by realizing the anchoring of single fiber bundles and adjusting the initial tension stress on each fiber bundle, and improve the integral tension prestress of the fiber woven mesh.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a method for manufacturing a fiber woven mesh reinforced concrete composite board comprises the following steps:
the method comprises the following steps of firstly, performing gum dipping treatment on a fiber woven mesh to obtain a gum dipped fiber woven mesh;
step two, flattening both ends of each fiber bundle of the fiber woven mesh after gum dipping, wherein the pressure during flattening is N a ；
Fixing the flattened part of each fiber bundle of the fiber woven mesh on a clamp, connecting a pre-tensioning device on the clamp, connecting the pre-tensioning devices to a total tensioning device, pre-tensioning the clamp by the pre-tensioning device, and then adjusting the pre-tensioning force on each fiber bundle to ensure that the pre-tensioning force on each fiber bundle is the same as T a ；
Step four, simultaneously tensioning all the clamps by a total tensioning device until all the fiber bundles reach a preset tension T b (ii) a The fiber bundles reach a predetermined tension T b While the pressure of the clamp on the fiber bundle is N b ；
Fifthly, pouring cement-based materials into the stretched fiber woven mesh, shearing the fiber woven mesh after the concrete is compositely hardened, and thus obtaining the fiber woven mesh reinforced concrete composite board;
wherein N is a ＞N b ；0＜T a ≤10％T b 。
The further improvement, pretension device and total tensioning equipment are the punching jack, and pretension device is connected with pretension force detection device, and pretension force detection device includes tension sensor.
In a further improvement, the fiber woven mesh is a carbon fiber woven mesh.
In the first step, during gum dipping, the glue used consists of 2-3 parts by volume of water glass and 1-1.5 parts by volume of internally doped waterproofing agent; the gum dipping time is 10-15min.
The further improvement is that the internally doped waterproofing agent is a sodium methylsilicate solution; the concentration of the sodium methylsilicate solution is 55-62%.
In a further improvement, the clamp comprises a U-shaped clamp, a separation blade is arranged at the opening end of the U-shaped clamp, an anchor cylinder is fixed in the separation blade, and the anchor cylinder is provided with two conical clamping pieces.
In the fourth step, during tensioning, the fiber woven mesh is firstly tensioned to 50% of the preset tension value, is stabilized for 2-3 minutes, changes of the fiber woven mesh are observed, and then the fiber woven mesh is tensioned to the preset tension value to maintain the stability of the force to be stressed.
The invention has the advantages that:
when prestressing force is applied to the fiber woven mesh, initial stress of each fiber bundle can be adjusted by anchoring a single fiber bundle through an anchorage device, after the initial stress of each fiber bundle is consistent, the fiber woven mesh is uniformly tensioned through an anchoring system, prestress application strength of the fiber woven mesh can be improved, accuracy and uniformity of tension application of each fiber bundle are improved, the fiber woven mesh is tensioned more uniformly, and the overall performance of the fiber woven mesh reinforced concrete composite board is improved.
Drawings
FIG. 1 is a schematic view of a fixture;
FIG. 2 is a schematic structural diagram of a device for manufacturing a prestressed fiber-woven mesh reinforced concrete composite board;
FIG. 3 is a schematic perspective view of a tensioning end anchoring device and a pretensioning device;
FIG. 4 is a schematic perspective view of an anchor end anchoring device;
FIG. 5 is a side view schematic of the tension end anchoring device and the pre-tension device;
FIG. 6 is a schematic structural view of an anchor plate;
FIG. 7 is a schematic structural view of a U-shaped guide frame;
FIG. 8 is a schematic view of the overall tensioning device configuration;
FIG. 9 is a schematic perspective view of a casting table;
FIG. 10 is a schematic view of a layered roller assembly;
FIG. 11 is a schematic view of the collapsing assembly;
FIG. 12 is a graph of tension displacement for both ends of a fiber bundle with and without a flattening operation.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
A method for manufacturing a fiber woven mesh reinforced concrete composite board comprises the following steps:
the method comprises the following steps of firstly, performing gum dipping treatment on a fiber woven mesh to obtain a gum dipped fiber woven mesh;
step two, flattening both ends of each fiber bundle of the fiber woven mesh after gum dipping, wherein the pressure during flattening is N a ；
Fixing the flattened part of each fiber bundle of the fiber woven mesh on a clamp, connecting a pre-tensioning device on the clamp, connecting the pre-tensioning devices to a total tensioning device, pre-tensioning the clamp by the pre-tensioning device, and then adjusting the pre-tensioning force on each fiber bundle to ensure that the pre-tensioning force on each fiber bundle is the same as T a ；
Step four, simultaneously tensioning all the clamps by a total tensioning device, firstly tensioning the total tensioning device to 50% of a preset tension value, stabilizing for 2-3 minutes, observing the change of the fiber woven net, and tensioning after stabilization until all the fiber bundles reach a preset tension T b Maintaining the stability of the force to be stressed; the fiber bundles reach a predetermined tension T b While the pressure of the clamp on the fiber bundle is N b ；
Fifthly, pouring a cement-based material to the tensioned fiber woven mesh, shearing the fiber woven mesh after the concrete is compositely hardened to obtain a fiber woven mesh reinforced concrete composite board;
wherein N is a ＞N b ；0＜T a ≤10％T b 。
The pre-tensioning device and the total tensioning device are through jacks, the pre-tensioning device is connected with a pre-tensioning force detection device, and the pre-tensioning force detection device comprises a tension sensor.
The fiber woven mesh is a carbon fiber woven mesh.
In the first step, when in gumming, the glue used consists of 2-3 parts by volume of water glass and 1-1.5 parts by volume of internal-doped waterproofing agent; the gum dipping time is 10-15min.
The internal-doped waterproofing agent is a sodium methylsilicate solution; the concentration of the sodium methylsilicate solution is 55-62%.
As shown in figure 1, the clamp comprises a U-shaped clamp 1,U, a blocking piece 2 is arranged at the opening end of the clamp 1, an anchor cylinder 4 is fixed on the blocking piece 2, and two conical clamping pieces 3 are arranged in the anchor cylinder 4.
In this embodiment, in the second step, the flattening and flattening operations are performed on the two ends of the fiber bundle, for the following reasons: when flattening and flattening are not performed, the corresponding relation between the pulling force and the displacement of the clamp on a single tensioning fiber bundle is shown as 12: it can be seen that after flattening and flattening, the displacement and the pulling force of the clamp are more approximate to a straight line, namely, the pulling force and the displacement are in a direct proportion relation, so that the tensioning force received by each fiber bundle is more uniform and consistent during tensioning, and when flattening and flattening are not performed, the displacement and the pulling force of the total tensioning device are curves during tensioning, so that even if the pre-tensioning force is uniformly adjusted through the pre-tensioning device, in the subsequent adjustment, the horizontal displacement of the clamp at the end part of each fiber bundle after being stressed is the same, the corresponding tensioning force is inevitably different, and the whole net is unevenly tensioned.
The reason for this is that, as shown in fig. 1, as the pulling force increases, the tapered clamping pieces 3 will have a vertical pressure on the fiber bundle, so that the gap between the two tapered clamping pieces 3 becomes smaller, and the tapered clamping pieces slide to the left, thereby superimposing the tensile displacement of the fiber bundle, and generating the curve change as shown in fig. 12. However, since the shapes of the fiber bundles are different and the clamping lengths are different, the sliding distances to the left of the tapered clamping pieces 3 are different when the tapered clamping pieces are under the same tension, and thus the fiber bundles are not uniform.
Example 2
In order to more conveniently implement the method, the invention discloses a device for manufacturing a prestressed fiber woven mesh reinforced concrete composite board, which comprises an anchoring end 5 and a tensioning end 6, wherein the anchoring end 5 comprises an anchoring device, the tensioning end 6 comprises an anchoring device and a pre-tensioning device, and the pre-tensioning device at the tensioning end 6 is connected with a total tensioning device. The inner sides of the anchoring end 5 and the tensioning end 6 are layered roller devices 8, a pouring platform 7 is arranged between the layered roller devices 8, the outer side of each layered roller device 8 comprises a U-shaped clamp 1,U clamp 1, the opening end of the U-shaped clamp 1 is internally provided with a blocking piece 2 in a protruding mode, two conical clamping pieces 3,U clamp 1 are inserted between the blocking pieces 2, a threaded rod 15 is connected with the blocking piece,
the pretensioning device comprises an adjusting nut 16 in threaded connection with the threaded rod 15, the adjusting nut 16 is connected with a gasket 17, a spring 18 is sleeved on the threaded rod 15 between the adjusting nut 16 and the U-shaped clamp 1, a limiting sleeve 19 is sleeved outside the spring 18, and the length of the limiting sleeve 19 is smaller than that of the spring 18 in a natural extension state; an anchoring plate 20 is arranged between the spring 18 and the U-shaped clamp 1, and the anchoring plate 20 is connected with the threaded rod 15 in a sliding mode and is fixedly connected with a total tensioning device.
The total tensioning device comprises a U-shaped frame 10 connected with an anchoring plate 20, the U-shaped frame 10 is connected to a sliding structure in a sliding mode, the sliding structure comprises a U-shaped guide frame 9,U, a roller 23 is connected to the U-shaped guide frame 9 through a roller 22 in a shaft mode, baffles 14 are fixed to two sides of the top of the U-shaped guide frame 9, the U-shaped frame 10 is connected with a screw rod 11, the screw rod 11 penetrates through a fixed frame plate 12 and is connected with a center-penetrating type jack 13, and the screw rod 11 is connected with the fixed frame plate 12 in a sliding mode. A first nut 25 corresponding to the fixed frame plate 12 and a second nut 24 corresponding to the feed-through jack 13 are connected to the screw 11 by screw threads. The U-shaped clamp 1 is provided with an anchor cylinder 4 for the conical clamping piece 3 to pass through.
The pouring platform 7 comprises a supporting plate 27, a pouring bottom plate 26 is fixed on the top of the supporting plate 27, and pouring side plates 28 are fixed on two sides of the pouring bottom plate 26.
The layering roller device 8 comprises two mounting plates 29, a plurality of groups of rollers are connected between the two mounting plates 29 in a shaft connection mode, each group of rollers comprises two rollers 21, and a gasket 17 is fixed on the adjusting nut 16.
When two ends of the fiber bundle are flattened, the flattening device comprises an upper pressing plate 30 and a lower pressing plate 31, a plurality of rectangular grooves are formed on the lower pressing plate 31, and rectangular pressing blocks matched with the rectangular grooves are protruded on the upper pressing plate 30; the upper pressing plate 30 and the lower pressing plate 31 are fixedly pressed by bolts 32.
The use method of the device comprises the following steps:
(1) The fiber woven net is firstly treated by dipping glue, and the fiber bundle at the anchor clamping section is clamped and shaped by a pressing plate device shown in fig. 11 when dipping glue. The pressing plate device is composed of an upper pressing plate, a lower pressing plate and bolts, the lower pressing plate is provided with grooves along a certain distance (equal to the distance between the fiber bundles), the corresponding position of the upper pressing plate is provided with a bulge, and the upper pressing plate and the lower pressing plate can be connected through the bolts to realize the compression. The specific operation is that a plastic film is paved on the lower pressing plate in advance, each fiber bundle in the stress direction of the fiber grid is placed in the corresponding groove of the lower pressing plate, then each fiber bundle in the groove of the brush is brushed with glue to fully dip the fiber bundle, then the plastic film is coated, the pressing plate is covered, the bolt is used for screwing, and the fiber is taken down after the glue is solidified.
(2) Lay the fibre mesh grid after the flooding in pour the bench, the tow both ends are pressed from both sides tightly through toper clamping piece 3 to anchor through anchor cylinder 4: after the fiber bundle is placed between the conical clamping pieces 3 of the anchorage device, the clamping pieces are pushed forwards, and the fibers are preliminarily clamped through the wedge-shaped structure of the anchor cylinder. When a plurality of layers of fiber woven nets are laid, the height of the anchorage device is larger than the distance between every two layers of fibers along the thickness direction, so that the distance between every two layers of fibers along the thickness direction needs to be enlarged by using a layering roller device, and the roller can rotate as shown in figure 5.
(3) After the fiber bundle is anchored by batch operation, the fixed end is anchored by screwing down the locking nut on the screw rod of the fixed end.
(4) The total tensioning device pulls the pre-tensioning device to pre-tension the fiber woven net, the pre-tensioned threaded rod 15 drives the adjusting nut 16 to compress the spring, and the compression amount of the compression spring is the pre-tensioning force of the fiber bundle. The adjusting nut 16 is then rotated so that the nut 16 bears against the stop sleeve 19, so that the compression of the springs, i.e. the pretension of the fibre tows, is the same. The springs are special springs, the stiffness of each spring is consistent, and the compression distance of the springs is ensured to be the same through the sleeve, so that the initial stress of each fiber bundle is consistent, as shown in fig. 3.
(5) And screwing the screw rod at the stretching end by using a nut, and connecting stretching and measuring equipment (such as a tension sensor) such as a feed-through jack, a feed-through sensor and the like.
(6) After the through jack and the sensor are installed, the jack is pressurized, the anchoring system is pulled to move on the slideway of the sliding system, when tensioning is carried out, the tensioning is firstly carried out to 50% of the prestress value, the stabilization is carried out for 2-3 minutes, the change of the fiber woven mesh is observed, then when the tensioning is carried out to the specified tension value, the locking nut at the tensioning end is locked, and when the stress is stable, the jack can be unloaded.
(7) And (4) pouring the fiber composite board, after the mortar is hardened, cutting the fiber woven mesh, knocking the clamping piece along the tensioning direction, and repeating the operation after the anchor is withdrawn.
The above description is only one specific guiding embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention using this concept shall fall within the scope of the invention.
Claims (7)
1. The manufacturing method of the fiber woven mesh reinforced concrete composite board is characterized by comprising the following steps of:
the method comprises the following steps of firstly, performing gum dipping treatment on a fiber woven mesh to obtain a gum dipped fiber woven mesh;
step two, flattening both ends of each fiber bundle of the fiber woven mesh after gum dipping, wherein the pressure during flattening is N a ；
Fixing the flattened part of each fiber bundle of the fiber woven mesh on a clamp, connecting a pre-tensioning device on the clamp, connecting the pre-tensioning devices to a total tensioning device, pre-tensioning the clamp by the pre-tensioning device, and then adjusting the fiber bundles to be subjected toThe pre-tension force is that the pre-tension force applied to each fiber bundle is the same as T a ；
Step four, simultaneously tensioning all the clamps by a total tensioning device, and tensioning the total tensioning device until all the fiber bundles reach a preset tension T b (ii) a At this time, the pressure of the jig against the fiber bundle is N b ；
Fifthly, pouring cement-based materials into the stretched fiber woven mesh until the cement-based materials are maintained for 28 days under standard maintenance conditions, and shearing the fiber woven mesh to obtain the fiber woven mesh reinforced cement-based composite board;
wherein N is a ＞N b ；0＜T a ≤10％T b 。
2. The method of claim 1, wherein the pre-tensioning device and the total tensioning device are through jacks, the pre-tensioning device is connected with a pre-tensioning force detection device, and the pre-tensioning force detection device comprises a tension sensor.
3. The method of claim 1, wherein the woven fiber mesh is a woven carbon fiber mesh.
4. The method for manufacturing the fiber woven mesh reinforced concrete composite board according to claim 1, wherein in the first step, during gum dipping, the glue used comprises 2-3 parts by volume of water glass and 1-1.5 parts by volume of an internal mixing type waterproof agent; the gum dipping time is 10-15min.
5. The method for manufacturing the fiber woven mesh reinforced concrete composite board according to claim 4, wherein the internal doping type waterproof agent is a sodium methyl silicate solution; the concentration of the sodium methylsilicate solution is 55-62%.
6. The method of claim 1, wherein the fixture comprises a U-shaped clip, a separation blade is formed at the open end of the U-shaped clip in an inward protruding manner, an anchor cylinder is fixed in the separation blade, and two conical clamping pieces are arranged in the anchor cylinder.
7. The method for manufacturing the fiber woven mesh reinforced concrete composite board according to claim 1, wherein in the fourth step, during the tensioning, the fiber woven mesh is firstly tensioned to 50% of the predetermined tension value, is stabilized for 2-3 minutes, the change of the fiber woven mesh is observed, and after the stabilization, the fiber woven mesh is tensioned to the predetermined tension value, and is maintained until the stress is stabilized.
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| CN108340474A (en) * | 2018-04-25 | 2018-07-31 | 泰州龙祥现代建筑发展有限公司 | A kind of precast prestressed concrete exterior wall cladding process units and production installation method |
| CN114109044B (en) * | 2021-11-25 | 2022-08-23 | 浙江大学 | 3D weaves and prints integration structure construction equipment |
| CN116787578A (en) * | 2023-08-22 | 2023-09-22 | 内蒙古工业大学 | Manufacturing device and manufacturing method of high-performance fiber reinforced cement substrate |
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