CN114851361B - U-shaped fiber reinforced composite material beam permanent formwork prefabricating mold and preparation method thereof - Google Patents

U-shaped fiber reinforced composite material beam permanent formwork prefabricating mold and preparation method thereof Download PDF

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Publication number
CN114851361B
CN114851361B CN202210589596.8A CN202210589596A CN114851361B CN 114851361 B CN114851361 B CN 114851361B CN 202210589596 A CN202210589596 A CN 202210589596A CN 114851361 B CN114851361 B CN 114851361B
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China
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shaped
layer
inner layer
die
cement
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CN114851361A (en
Inventor
冯然
侯林兵
朱继华
邢锋
许颖
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Shenzhen University
Shenzhen Graduate School Harbin Institute of Technology
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Shenzhen University
Shenzhen Graduate School Harbin Institute of Technology
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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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
    • B28B7/18—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article
    • 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
    • B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
    • B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
    • 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
    • B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/093—Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
    • 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
    • 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
    • B28B23/18—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 for the production of elongated articles
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0002—Auxiliary parts or elements of the mould
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0002—Auxiliary parts or elements of the mould
    • B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
    • 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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/28—Cores; Mandrels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Abstract

The invention provides a permanent formwork prefabricating die for a U-shaped fiber reinforced composite beam and a preparation method thereof, wherein the prefabricating die comprises a bottom plate, an inner layer die, an outer layer moving die, an inner layer U-shaped plug used for being sleeved at the outer sides of two ends of the inner layer die and an outer layer U-shaped plug used for being sleeved at the outer sides of the inner layer U-shaped plug, the thickness of a plate of the inner layer U-shaped plug is consistent with that of an inner layer cement-based composite layer, and the thickness of a plate of the outer layer U-shaped plug is consistent with that of an outer layer cement-based composite layer; the bottom plate is provided with a positioning member for fixing the inner layer die and a fixing member for fixing the outer layer moving die which moves outwards; the bottom plate, the inner layer die, the outer layer moving die and the inner layer U-shaped plug/outer layer U-shaped plug form a U-shaped cavity. By adopting the technical scheme of the invention, the die has a simple structure, solves the problems of uneven fiber dispersion, non-compact pouring, limited fiber grid reinforcing layer number and the like, and prolongs the service life of the structure.

Description

U-shaped fiber reinforced composite material beam permanent formwork prefabricating mold and preparation method thereof
Technical Field
The invention relates to the technical field of building prefabrication molds, in particular to a permanent formwork prefabrication mold for a U-shaped fiber reinforced composite beam and a preparation method thereof.
Background
With the wide application of reinforced concrete structures in buildings, bridges and marine structures, pebbles, river sand and fresh water resources adopted by concrete are gradually becoming scarce, so that the building cost is greatly increased, and the geological condition on land is becoming worse. Therefore, many scholars adopt sea water and sea sand to replace fresh water river sand so as to alleviate the problem of resource scarcity. However, seawater and sea sand contain a large amount of SO4-2, cl-and other anions with erosion effect, and the corrosion degree of the poured reinforced concrete structure is far greater than that of the reinforced concrete of the freshwater river sand, SO that the strength and the rigidity of the structure are rapidly reduced. Therefore, in order to alleviate the condition that the mechanical properties are reduced due to corrosion of the components, students at home and abroad develop and research various reinforcing technologies, wherein the adhesion of fiber reinforced composite materials (FRP) is a common reinforcing means, and meanwhile, the FRP has better durability.
FPR is widely used in the fields of reinforcing civil buildings, bridges, marine structures and the like because of the characteristics of high specific strength, good corrosion resistance, similar thermal expansion coefficient to concrete and the like. Although the FRP material has the capability of resisting various environments in a short term, due to the complexity and diversity of practical application environments, and the FRP reinforcing structure is subjected to long-term load and severe environments, the matrix material epoxy resin of the FRP reinforcing structure is easy to degrade due to high temperature or low temperature, so that the bonding force between the FRP material and concrete is weakened, and the coordination working capability between the FRP material and the concrete is reduced. In addition, the simple structural reinforcement cannot prevent further corrosion and aging of the steel bars in the reinforced concrete, the bearing capacity and rigidity of the structure are continuously reduced, and the problem of durability of the structure is not completely solved. The impressed current cathodic protection technology forms a closed circuit with the reinforcing steel bars through an external power supply and auxiliary anode materials, so that the reinforcing steel bars in the reinforced concrete can be effectively protected from corrosion of anions such as Cl & lt- & gt, and further corrosion of the reinforcing steel bars is avoided. Therefore, the durability and the corrosion resistance of the reinforced concrete structure can be effectively improved by combining the structure reinforcing technology and the impressed current cathodic protection technology.
The problems of steel bar corrosion and durability not only cause the strength and rigidity degradation of the established structure, but also are design problems of the service life and the service life of the newly-established structure to be considered. In order to fundamentally solve the durability problem of reinforced concrete structures, a technology for protecting a building from the start of service is required to be developed and studied.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a permanent template prefabricating die for a U-shaped fiber reinforced composite beam and a preparation method thereof, which solve the problems of uneven fiber dispersion and non-compact pouring in a cement-based composite material, avoid the suspension of doped fibers on a fiber grid in the cement-based composite material, and the produced permanent template has good anti-cracking, conductive and anti-erosion capabilities.
In this regard, the invention adopts the following technical scheme:
the U-shaped fiber reinforced composite beam permanent formwork comprises an inner cement-based composite layer, an outer cement-based composite layer and a fiber grid, wherein the fiber grid is positioned between the inner cement-based composite layer and the outer cement-based composite layer;
the U-shaped fiber reinforced composite material beam permanent formwork prefabricating die comprises a bottom plate, an inner layer die, an outer layer moving die, an inner layer U-shaped plug and an outer layer U-shaped plug, wherein the inner layer U-shaped plug is used for being sleeved at the outer sides of two ends of the inner layer die, the outer layer U-shaped plug is used for being sleeved at the outer sides of the inner layer U-shaped plug, the thickness of a plate of the inner layer U-shaped plug is consistent with that of an inner layer cement-based composite material layer, and the thickness of a plate of the outer layer U-shaped plug is consistent with that of an outer layer cement-based composite material layer;
the outer layer moving die comprises two templates respectively positioned at the front side and the rear side of the inner layer die;
the bottom plate is provided with a positioning component for fixing the inner layer die and a fixing component for fixing the outer layer moving die which moves outwards, the inner diameter of the inner layer U-shaped plug is consistent with the width of the inner layer die, and the inner diameter of the outer layer U-shaped plug is matched with the outer diameter of the inner layer U-shaped plug;
the two sides of the inner layer U-shaped plug are fixedly connected with the inner layer die through connecting members, and the two sides of the outer layer U-shaped plug are connected with the inner layer U-shaped plug through connecting members; the bottom plate, the inner layer die, the outer layer moving die and the inner layer U-shaped plug form a U-shaped cavity. After the cement-based composite material is poured into the U-shaped cavity, the outer layer moving die is moved outwards, and the bottom plate, the inner layer cement-based composite material layer, the outer layer moving die and the outer layer U-shaped plug form another U-shaped cavity.
By adopting the technical scheme, the detachable die can be obtained through the assembly of the bottom plate, the inner die, the outer moving die, the inner U-shaped plug, the outer U-shaped plug and other parts, the inner cement-based composite material layer can be obtained by pouring the cement-based composite material into the U-shaped cavity, after the fiber grid is installed, the outer moving die is moved, the outer U-shaped plug is installed, a second U-shaped cavity is formed, and the second U-shaped cavity is poured with the outer cement-based composite material layer which can be connected with the inner cement-based composite material layer and the fiber grid. The die has simple structure, convenient operation and low cost; and the obtained template has good durability and corrosion resistance.
Connecting holes for fixedly connecting with the inner layer die are formed in the two sides of the inner layer U-shaped plug, and connecting holes for connecting with the inner layer U-shaped plug are formed in the two sides of the outer layer U-shaped plug; besides preventing slurry leakage and controlling the thickness of the inner cement-based composite material layer and the outer cement-based composite material layer, the two plugs can fix fiber grids and perform pre-tightening tensioning by bolts.
As a further improvement of the invention, the connecting holes are bolt holes. The connector and the connecting member may be bolts.
As a further improvement of the invention, the inner layer die comprises two C-shaped templates which are spliced, a gap between the C-shaped templates is filled with foaming agent or rubber, the bottom of the C-shaped templates is an inverted fixed template, the bottom of the C-shaped templates is provided with bolt holes, and the C-shaped templates can be connected with the bottom plate through bolts. By adopting the technical scheme, the installation and the disassembly are convenient, and the cost is low. Furthermore, the two ends of the C-shaped template are provided with positioning holes, so that the inner U-shaped plug is convenient to install and fix. Further, the C-shaped template is a C-shaped steel plate.
As a further improvement of the invention, the positioning member comprises a positioning hole.
As a further improvement of the present invention, the fixing member includes a fixing hole of an elongated shape. By adopting the technical scheme, the device is convenient to install and move and is not easy to misplace.
As a further improvement of the present invention, the outer layer moving mold includes two L-shaped mold plates provided with stiffening ribs, so that the mold can be ensured to have sufficient rigidity. Wherein, L type template is L shaped steel board.
As a further improvement of the invention, the bottom of the L-shaped template is provided with a bolt hole connected with a fixing member of the bottom plate so as to be convenient for connection and fixation with the bottom plate.
As a further improvement of the present invention, the bottom of the L-shaped formwork is connected with the fixing member of the bottom plate by bolts.
As a further improvement of the invention, the inner U-shaped plug is a U-shaped steel plate, and the inner dimension of the inner U-shaped plug is the same as the outer dimension of the inner die.
As a further improvement of the invention, the outer layer U-shaped plug and the inner layer U-shaped plug are consistent in structure, and the inner dimension of the outer layer U-shaped plug is the same as the outer dimension of the inner U-shaped plug.
As a further improvement of the invention, the U-shaped plugs on the outer layer can be multiple, and the multi-layer cement-based composite material can be poured, and the method is not limited to 2 layers.
As a further improvement of the invention, the U-shaped fiber reinforced composite beam permanent formwork prefabrication mould comprises an auxiliary pouring steel plate for preventing damage to the inner cement-based composite layer or displacement of the fiber grid when pouring to form the outer cement-based composite layer. The auxiliary pouring steel plate is an auxiliary tool for the pouring process.
The invention also discloses a preparation method of the U-shaped fiber reinforced composite beam permanent template, which is characterized in that: the method is prepared by adopting the U-shaped fiber reinforced composite material beam permanent template prefabricating die, and comprises the following steps:
step S1, fixing an inner layer die on a bottom plate, nesting inner layer U-shaped plugs and fixing the inner layer U-shaped plugs at the outer sides of two ends of the inner layer die; fixing the outer layer moving die on a bottom plate, and enabling the outer layer moving die, the inner layer die and the inner layer U-shaped plug to form a U-shaped cavity; fixing a layer of film on the inner surface of the outer layer moving die;
s2, pouring cement-based composite materials into the U-shaped cavity, and obtaining an inner cement-based composite material layer after the cement-based composite materials are initially set; disassembling an outer layer moving die, moving the outer layer moving die outwards, taking down a film, paving fiber grids on the surface of an inner layer cement-based composite material layer, pressing the fiber grids to enable the fiber grids to be embedded into the inner layer cement-based composite material layer, ensuring that the grids and a cement base have a strong bonding effect, paving redundant fiber grids on two sides of the fiber grids on the outer side of an inner layer U-shaped plug, sleeving the outer layer U-shaped plug on the outer side of the redundant fiber grids, fixedly connecting the outer layer U-shaped plug with the inner layer U-shaped plug, and preventing the fiber grids from shifting in the pouring process;
step S3, the outer layer moving die is moved outwards and fixed on the bottom plate, so that a second U-shaped cavity is formed by the outer layer moving die, the inner layer cement-based composite material layer and the outer layer U-shaped plug;
s4, pouring a cement-based composite material into the second U-shaped cavity, and removing the outer layer moving die, the outer layer U-shaped plug, the inner layer U-shaped plug and the inner layer die after hardening; and (5) natural maintenance.
By adopting the technical scheme, the obtained beam permanent template is integrally formed, and the cement-based and fiber grids and the cement-based and cement-based have good interface performance.
As a further improvement of the invention, in the step S2, when the cement-based composite material is poured into the U-shaped cavity, an auxiliary pouring steel plate is adopted to cling to the film, and the steel plate is lifted at one side of the cement-based composite material, so that the shearing force applied to the plastic film is reduced, and the plastic film is prevented from being damaged.
As a further improvement of the present invention, in step S4, an auxiliary pouring steel plate is placed close to the inner cement-based composite layer, then the outer cement-based composite is poured, and the steel plate is lifted on one side of the pouring cement-based composite to reduce the shearing force to which the fiber mesh is subjected, so as to prevent the fiber mesh from being displaced.
As a further improvement of the invention, in the steps S2 and S4, vibration is continuously carried out in the pouring process, so that the pouring compactness is ensured.
As a further improvement of the invention, in the step S1, a release agent is smeared on the outer side of the inner layer mould, one side of the inner layer U-shaped plug facing the cavity and the inner side of the outer layer movable mould; and coating a release agent on the surface of the film.
In step S2, a release agent is applied to the side of the outer U-shaped plug facing the cavity.
As a further improvement of the invention, in the step S4, when hardening is carried out, the plastic wrap is adhered and then is placed in a shade place for hardening, and the die is removed after 48 hours; and during natural curing, the U-shaped fiber reinforced composite beam permanent template is covered by a preservative film, and the natural curing is carried out for 28 days.
Compared with the prior art, the invention has the beneficial effects that:
firstly, by adopting the technical scheme of the invention, the production requirements of beam permanent templates with different thicknesses, layers and lengths can be easily met, the problems of uneven fiber dispersion and non-compact pouring in the cement-based composite material are solved, the phenomenon that the doped fibers in the cement-based composite material are hung on fiber grids is avoided, and the produced permanent template has good anti-cracking, conductive and anti-erosion capabilities. Meanwhile, the problem of durability of the reinforced concrete structure is fundamentally solved, and the fiber reinforced cement-based composite material permanent template can be used as a structural external reinforcing material or an auxiliary anode material of an impressed current cathodic protection technology. In addition, the use of the fiber reinforced cement-based composite material permanent template can save template consumption, and the fiber reinforced cement-based composite material permanent template and concrete form a combined structure after construction, and are stressed together, so that the effect of improving the durability of the structure can be exerted from the initial use stage of the structure, and the service life of the structure is prolonged.
Secondly, by adopting the technical scheme of the invention, the die has simple structure, easy installation and low cost.
Drawings
Fig. 1 is a schematic diagram of a structure of an assembled mold for preparing a permanent mold of a U-shaped fiber reinforced cement-based composite beam according to an embodiment of the present invention.
Fig. 2 is a top view of a base plate according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an inner mold according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an inner layer U-shaped plug according to an embodiment of the present invention.
Fig. 5 is an assembly schematic diagram of a bottom plate, an inner layer mold and an inner layer U-shaped plug according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an outer layer moving mold according to an embodiment of the present invention.
Fig. 7 is a schematic diagram showing assembly of a mold when pouring an inner cement-based composite material according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of an outer U-shaped plug according to an embodiment of the present invention.
Fig. 9 is a schematic structural view of an auxiliary pouring steel plate according to an embodiment of the present invention.
The reference numerals include:
the steel plate casting device comprises a base plate 1, an inner layer die 2, an outer layer moving die 3, an inner layer U-shaped plug 4, an outer layer U-shaped plug 5, an auxiliary pouring steel plate 6 and bolts 7;
11-positioning holes and 12-fixing holes;
21-C-shaped steel plates, 22-bottom plate connecting holes and 23-plug connecting holes;
31-L-shaped steel plates, 32-stiffening ribs and 33-bolt holes;
41-connection holes.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
The U-shaped fiber reinforced cement-based composite material beam permanent template comprises an inner-layer cement-based composite material, an outer-layer cement-based material and a fiber grid, wherein the fiber grid is positioned between the inner-layer cement-based composite material and the outer-layer cement-based material.
As shown in fig. 1, the embodiment provides a preparation mold for preparing the permanent mold plate of the U-shaped fiber reinforced cement-based composite beam, which comprises a bottom plate 1, an inner layer mold 2, an outer layer moving mold 3, an auxiliary pouring steel plate 6, an inner layer U-shaped plug 4 and an outer layer U-shaped plug 5. The bottom plate 1 is respectively provided with a positioning hole 11 of the inner layer die 2 and a fixing hole 12 of the outer layer moving die 3, wherein the fixing hole 12 of the outer layer moving die 3 is a slotted hole, and the outer layer moving die 3 can be freely fixed according to the thickness and layer number requirements of the cement-based composite material, as shown in fig. 2. In addition, the positioning holes 11 are provided with threads, the inner layer mold 2 can be fixedly connected by bolts 7, and the outer layer moving mold 3 is fixed by high-strength bolts 7 and nuts.
Specifically, as shown in fig. 3, the inner layer mold 2 is composed of two C-shaped steel plates 21, the lower part of the C-shaped steel plates 21 is provided with an inverted fixed steel plate, a bottom plate connecting hole 22 is arranged on the fixed steel plate, the two C-shaped steel plates 21 are assembled into an inverted U-shaped inner layer mold 2, and a middle gap is filled with foaming agent or rubber, so that the demolding operation after the permanent mold of the U-shaped fiber reinforced cement-based composite beam is formed is facilitated; meanwhile, plug connecting holes 23 are formed in two ends of the inner layer die 2, so that the inner layer U-shaped plugs 4 and the outer layer U-shaped plugs 5 can be conveniently fixed.
As shown in fig. 4, the inner layer U-shaped plug 4 is a U-shaped steel plate, the inner dimension of the inner layer U-shaped plug is the same as the outer dimension of the inner layer die 2, the thickness of the inner layer U-shaped plug is consistent with the thickness of the inner layer cement-based composite material, and connecting holes 41 fixed with the inner layer die 2 are formed on two sides of the inner layer U-shaped plug 4; the inner layer U-shaped plugs 4 are nested at two ends of the inner layer die 2 to prevent slurry leakage at the two ends, and meanwhile, the pouring thickness of the cement-based composite material can be controlled, as shown in fig. 5.
As shown in fig. 6, the outer layer moving mold 3 includes two L-shaped steel plates 31 positioned at both front and rear sides of the inner layer mold 2, stiffening ribs 32 are provided on the L-shaped steel plates 31 to ensure that the mold has sufficient rigidity, and bolt holes 33 are provided at the bottoms of the L-shaped steel plates 31 to facilitate connection and fixation with the base plate 1. As shown in fig. 7, the outer layer moving mold 3, the inner layer plug and the inner layer mold 2 form a U-shaped cavity, and the inner layer cement-based composite material is poured.
As shown in fig. 8, the outer layer U-shaped plug 5 and the inner layer U-shaped plug 4 are identical in structure, the inner dimension of the outer layer U-shaped plug 5 is identical to the outer dimension of the inner U-shaped plug, and the thickness of the outer layer U-shaped plug is identical to the thickness of the outer layer cement-based composite material. Meanwhile, the side surfaces of the outer U-shaped plug 5 and the inner U-shaped plug 4 are respectively provided with a connecting hole 41 for fixing, besides preventing slurry leakage and controlling the pouring thickness of the cement-based composite material, a fiber grid can be fixed between the outer U-shaped plug 5 and the inner U-shaped plug 4, and pre-tensioning is carried out by adopting bolts 7, as shown in fig. 1.
As shown in fig. 9, the auxiliary pouring steel plate 6 is a steel plate having a thickness of 2mm in this embodiment. The use mode of the auxiliary pouring steel plate 6 is as follows: after the outer layer U-shaped plug 5 is installed, the outer layer moving die 3 moves inwards again, a second layer U-shaped cavity is formed by the outer layer moving die 3, the inner layer die 2 and the outer layer U-shaped plug 5, and a cement-based composite material is poured. In the pouring process, the auxiliary pouring templates are tightly attached to the inner-layer cement-based composite material, and one side is poured and lifted to ensure that the inner-layer cement-based composite material is subjected to vertical uniform pressure of cement paste, reduce shearing force applied to the inner-layer cement-based composite material, prevent fiber grids from moving, and the obtained beam permanent templates are integrally formed, so that the cement-based and fiber grids and the cement-based and cement-based have good interface performance.
The method for preparing the U-shaped fiber reinforced cement-based composite beam permanent template by adopting the die comprises the following steps of:
(1) Splicing 2 inner-layer C-shaped steel plates, fixing the steel plates on a bottom plate by bolts, and blocking gaps between the steel plates by foaming agent or rubber to prevent slurry leakage and obtain an inner-layer die;
(2) After the inner layer mould is assembled, fixing the inner layer U-shaped plugs at two ends of the inner layer mould, and then uniformly smearing release agents on the outer side of the inner layer mould and the inner side of the inner layer U-shaped plugs;
(3) Fixing bolts are adopted to fix the outer layer moving die on the bottom plate through fixing holes of the outer layer moving die, a U-shaped cavity is formed by the outer layer moving die, the inner layer die and the inner layer U-shaped plug, and then a release agent is uniformly smeared on the inner side of the outer layer moving die.
And fixing a layer of plastic film on the inner surface of the outer layer moving die, and uniformly smearing a release agent on the surface of the plastic film. Because the outer layer moving die needs to move outwards during cement-based initial setting, in order to prevent cement-based collapse caused by demolding, a layer of plastic film is covered on the die, so that demolding during cement-based initial setting can be facilitated.
(4) And (3) tightly attaching the auxiliary pouring steel plate to the plastic film, pouring cement-based composite material on one side, and lifting the steel plate on the other side so as to reduce the shearing force applied to the plastic film and prevent the plastic film from being damaged. In the pouring process, continuously vibrating to ensure the pouring compactness, and finally pouring to obtain a member formed by the inner cement-based composite material;
(5) After pouring the inner cement-based composite material, after cement-based is initially set (about 1 hour), the outer moving die fixing bolts are disassembled, the outer moving die is moved outwards, and the plastic film on the inner cement-based composite material is taken down. Then, the fiber grids are paved on the surface of the inner layer cement-based composite material, and the fiber grids are pressed by a pressing plate, so that the fiber grids are embedded into the cement-based composite material, the fiber grids and the cement-based composite material are ensured to have a strong bonding effect, the length of the fiber grids is larger than that of an inner layer mould, then redundant fiber grids on two sides are paved on the inner layer U-shaped plug, then the outer layer U-shaped plug is fixedly pressed by bolts, and the fiber grids are prevented from shifting.
(6) And uniformly smearing a release agent on the inner side of the outer layer U-shaped plug, and then fixing the outer layer moving die on the fixing hole of the bottom plate again to form a second U-shaped cavity together with the inner layer cement-based composite material and the outer layer U-shaped plug.
(7) Placing the auxiliary pouring steel plate tightly close to the inner cement-based composite material, pouring the outer cement-based composite material as soon as possible, and pouring the cement-based steel plate on one side to reduce the shearing force suffered by the fiber grid so as to prevent the fiber grid from shifting. In the pouring process, vibration is continued, the pouring compactness is guaranteed, the construction mode can ensure that the beam permanent template is integrally formed, the pouring time difference between the inner cement base and the outer cement base is small, the fact that a weak interface does not exist between the inner cement base and the outer cement base can be guaranteed, and the overall performance of the permanent template is better.
(8) And (3) attaching a preservative film to the sample, then placing the sample in a shade place for hardening, and removing the die after 48 hours. The outer layer moving die is removed firstly, then the inner layer U-shaped plug and the outer layer U-shaped plug are removed, then the foaming agent or rubber in the middle of the inner layer die is removed, and finally the inner layer die is removed.
(9) Trimming redundant fiber grids, flushing with the cement-based composite material, covering the sample with a preservative film, and naturally curing for 28 days to finish prefabrication of the U-shaped beam permanent template.
(10) And cleaning the removed inner layer mould, outer layer movable mould, inner layer U-shaped plug, outer layer U-shaped plug, bottom plate and other moulds so as to be reused.
Preferably, during the construction process, the following points are noted:
(1) After the inner layer mold is assembled, the top surfaces of the C-shaped steel plates on two sides are ensured to be positioned on the same horizontal plane, and two ends are flush; when the gap is filled, after the gap is filled tightly, the filling material is trimmed to be flush with the top surface of the C-shaped steel plate.
(2) When arranging the plastic film, the mold and the plastic film are both required to be coated with a release agent on the outer layer, and the plastic film is ensured to be firmly fixed, and the surface is flat and tight; in addition, in the pouring process, the plastic film is prevented from being scratched and torn by the auxiliary pouring steel plate.
(3) The thickness of the top cement base is determined according to the inner layer U-shaped plug and the outer layer U-shaped plug, namely the top of the inner layer cement base composite material is flush with the inner layer U-shaped plug, and the top of the outer layer cement base composite material is flush with the outer layer U-shaped plug, so that a beam permanent template with accurate size is ensured to be obtained.
(4) When the fiber grids are tiled, the fiber grids are tightly pressed and embedded into the inner cement-based composite material, two ends of the fiber grids are clamped and tensioned by the inner U-shaped plugs and the outer U-shaped plugs, and the fiber grids are sequentially paved and pressed from one side to the top to the other side.
(5) When the inner layer mould is disassembled, firstly, the filling material of the middle gap is disassembled, and then the C-shaped steel plate is disassembled, so that no damage to the cement-based permanent mould is ensured.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims (9)

1. The utility model provides a permanent template prefabricated mould of U-shaped fiber reinforced composite beam which characterized in that: the U-shaped fiber reinforced composite beam permanent template comprises an inner cement-based composite layer, an outer cement-based composite layer and a fiber grid, wherein the fiber grid is positioned between the inner cement-based composite layer and the outer cement-based composite layer;
the U-shaped fiber reinforced composite material beam permanent formwork prefabricating die comprises a bottom plate, an inner layer die, an outer layer moving die, an inner layer U-shaped plug and an outer layer U-shaped plug, wherein the inner layer U-shaped plug is used for being sleeved at the outer sides of two ends of the inner layer die, the outer layer U-shaped plug is used for being sleeved at the outer sides of the inner layer U-shaped plug, the thickness of a plate of the inner layer U-shaped plug is consistent with that of an inner layer cement-based composite material layer, and the thickness of a plate of the outer layer U-shaped plug is consistent with that of an outer layer cement-based composite material layer;
the outer layer moving die comprises two templates respectively positioned at the front side and the rear side of the inner layer die;
the bottom plate is provided with a positioning member for fixing the inner layer die and a fixing member for fixing the outer layer moving die which moves outwards; connecting holes for fixedly connecting with the inner layer die are formed in the two sides of the inner layer U-shaped plug, and connecting holes for connecting with the inner layer U-shaped plug are formed in the two sides of the outer layer U-shaped plug;
the bottom plate, the inner layer die, the outer layer moving die and the inner layer U-shaped plug/outer layer U-shaped plug form a U-shaped cavity; the inner layer die comprises two C-shaped templates which are spliced, gaps between the C-shaped templates are filled with foaming agent or rubber, and the C-shaped templates are connected with the bottom plate through bolts.
2. The U-shaped fiber reinforced composite beam permanent formwork prefabricated mold of claim 1, wherein: the positioning member includes a positioning hole.
3. The U-shaped fiber reinforced composite beam permanent formwork prefabricated mold of claim 1, wherein: the fixing member includes a fixing hole in a long strip shape.
4. The U-shaped fiber reinforced composite beam permanent formwork prefabricated mold of claim 1, wherein: the outer layer movable mould comprises two L-shaped templates, and the L-shaped templates are provided with stiffening ribs.
5. The U-shaped fiber reinforced composite beam permanent formwork prefabricated mold of claim 4 wherein: the bottom of the L-shaped template is provided with a bolt hole connected with a fixing member of the bottom plate.
6. The permanent formwork prefabrication mold for the U-shaped fiber reinforced composite girder according to any one of claims 1-5, wherein: which includes an auxiliary casting steel plate for preventing damage to the inner cement-based composite material layer or displacement of the fiber mesh when the outer cement-based composite material layer is formed by casting.
7. The preparation method of the U-shaped fiber reinforced composite beam permanent template is characterized by comprising the following steps of: the method is prepared by adopting the permanent template prefabricating die for the U-shaped fiber reinforced composite beam according to any one of claims 1-6, and comprises the following steps:
step S1, fixing an inner layer die on a bottom plate, nesting inner layer U-shaped plugs and fixing the inner layer U-shaped plugs at the outer sides of two ends of the inner layer die; fixing the outer layer moving die on a bottom plate, and enabling the outer layer moving die, the inner layer die and the inner layer U-shaped plug to form a U-shaped cavity; fixing a layer of film on the inner surface of the outer layer moving die;
s2, pouring cement-based composite materials into the U-shaped cavity, and obtaining an inner cement-based composite material layer after the cement-based composite materials are initially set; disassembling an outer layer moving die, moving the outer layer moving die outwards, taking down a film, paving fiber grids on the surface of an inner layer cement-based composite material layer, pressing the fiber grids to enable the fiber grids to be embedded into the inner layer cement-based composite material layer, paving redundant fiber grids on two sides of the fiber grids on the outer side of an inner layer U-shaped plug, sleeving the outer layer U-shaped plug on the outer side of the redundant fiber grids, and fixedly connecting the outer layer U-shaped plug with the inner layer U-shaped plug;
step S3, the outer layer moving die is moved outwards and fixed on the bottom plate, so that a second U-shaped cavity is formed by the outer layer moving die, the inner layer cement-based composite material layer and the outer layer U-shaped plug;
s4, pouring a cement-based composite material into the second U-shaped cavity, and removing the outer layer moving die, the outer layer U-shaped plug, the inner layer U-shaped plug and the inner layer die after hardening; and (5) natural maintenance.
8. The method for preparing the permanent formwork for the U-shaped fiber reinforced composite beam, as claimed in claim 7, wherein the method comprises the following steps:
in the step S2, when the cement-based composite material is poured into the U-shaped cavity, an auxiliary pouring steel plate is adopted to cling to the film, and the steel plate is lifted on one side of the cement-based composite material;
in the step S4, the auxiliary pouring steel plate is closely attached to the inner cement-based composite material layer, then the outer cement-based composite material layer is poured, and the steel plate is lifted on one side of the cement-based composite material layer;
and step S2 and step S4, continuously vibrating in the pouring process, and ensuring the pouring compactness.
9. The method for preparing the permanent formwork for the U-shaped fiber reinforced composite beam, as claimed in claim 8, wherein the method comprises the following steps: in the step S1, a release agent is smeared on the outer side of an inner layer die, one side of an inner layer U-shaped plug facing a cavity and the inner side of an outer layer moving die; coating a release agent on the surface of the film;
in the step S2, a release agent is smeared on one side of the outer layer U-shaped plug towards the cavity;
in the step S4, when hardening is carried out, a preservative film is stuck on the test piece, and then the test piece is placed in a shade place for hardening, and the die is removed after 48 hours; and during natural curing, the U-shaped fiber reinforced composite beam permanent template is covered by a preservative film, and the natural curing is carried out for 28 days.
CN202210589596.8A 2022-05-27 2022-05-27 U-shaped fiber reinforced composite material beam permanent formwork prefabricating mold and preparation method thereof Active CN114851361B (en)

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AU1760695A (en) * 1994-05-20 1995-11-30 Waffle-Crete International, Inc. Concrete panel construction and mold
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CN103934885A (en) * 2014-04-18 2014-07-23 富于安（福建）环保模板有限公司 Integral beam pouring system and integral beam clamp of concrete formworks
CN106049759A (en) * 2016-07-29 2016-10-26 华南理工大学 Cylindrical ultra-high performance concrete permanent formwork and preparation method thereof
CN113119297A (en) * 2021-04-22 2021-07-16 哈尔滨工业大学（深圳） Preparation mold and preparation method of fiber reinforced cement-based composite material prefabricated pipe
CN213732497U (en) * 2020-08-25 2021-07-20 广东丰业电力器材有限公司 Prevent running thick liquid wire pole mould device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85204221U (en) * 1985-10-07 1986-09-24 邵阳市市政工程公司 Steel die set for tamping concrete fabricated pipe
AU1760695A (en) * 1994-05-20 1995-11-30 Waffle-Crete International, Inc. Concrete panel construction and mold
CN103266760A (en) * 2013-05-14 2013-08-28 浙江大学 Permanent beam template made of fiber woven mesh reinforced cement based composite material and method for manufacturing permanent beam template
CN103934885A (en) * 2014-04-18 2014-07-23 富于安（福建）环保模板有限公司 Integral beam pouring system and integral beam clamp of concrete formworks
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