CN111663459A - Bridge reinforcing device based on high-molecular metal composite material plate and manufacturing method thereof - Google Patents
Bridge reinforcing device based on high-molecular metal composite material plate and manufacturing method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/36—Hydroxylated esters of higher fatty acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/4269—Lactones
- C08G18/4277—Caprolactone and/or substituted caprolactone
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6662—Compounds of group C08G18/42 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/6696—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
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Abstract
The invention provides a bridge reinforcing device based on a high-molecular metal composite material plate and a manufacturing method thereof, and the bridge reinforcing device is applied to maintenance and reinforcement of bridges. The device comprises a longitudinal beam and a cross beam connected with the longitudinal beam through a connecting plate, wherein the connecting plate is vertically connected with the cross beam; the upper wing plate and the connecting plate of the cross beam are respectively provided with an L-shaped steel plate fixedly connected with the upper wing plate and the connecting plate, and peripheral steel sheets are arranged between the L-shaped steel plate and the upper wing plate and between the L-shaped steel plate and the connecting plate of the cross beam; the L-shaped steel plate is provided with 3 exhaust holes and 1 pouring hole, and a high polymer material interlayer is poured in the pouring hole. The device is welded on the upper wing plate of the beam and the beam connecting plate to prevent the connecting plate from bending out of the plane to generate fatigue cracks, thereby increasing the local fatigue resistance, preventing the fatigue cracks from expanding and improving the overall strength and rigidity of the beam connecting plate. The method can be applied to the reinforcement and repair of the bearing metal structure in large-scale equipment, and can obviously improve the bearing capacity of the metal structure.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to a bridge reinforcing device based on a high-molecular metal composite material plate and a manufacturing method thereof.
Background
Steel bridge fatigue may be defined as a progressive destructive behavior from the formation and slow propagation of localized micro-cracks initiated at defects or flaws under repeated cyclic stresses until finally failure occurs. Under the action of cyclic load, fatigue cracks are easily generated in the flat and longitudinal connecting structure of the steel-framed bridge, and the cracks can cause structural damage to a certain extent and bring threat to bridge safety.
At present, a common bridge reinforcing method in China is to reinforce a bridge by adhering carbon fiber composite plates, wherein the carbon fiber reinforced composite plates are composite materials generated by micro fibers wrapped in a resin matrix. The carbon fibers serve as stiffening reinforcement, while the resin serves as a binder for the fibers, typically an epoxy resin. The shearing force between the fibers and the concrete is transferred through the resin, so that the reinforcing effect is achieved. The method for adhering the carbon fiber composite plate is to arrange continuous carbon fibers with high strength or high elastic modulus in a bundle in a single direction and impregnate the continuous carbon fibers with epoxy resin to form a carbon fiber reinforced composite sheet. The sheet is adhered to the tension surface of the bridge structure by specially prepared epoxy resin, the resin is cured to form a new stressed complex with the original structure, and the carbon fiber and the reinforcing steel bar can be stressed together. Because the carbon fiber sheets share the load, the stress of the reinforcing steel bar is reduced, and the structure is reinforced.
In conclusion, the carbon fiber reinforced composite material is gradually and widely applied to bridge reinforcement due to the characteristics of light weight, high strength, corrosion resistance, fatigue resistance and the like, and the defects of the carbon fiber reinforced composite material in the bridge reinforcement application are also shown. As follows:
(1) the bending rigidity of the reinforcing beam in the later loading stage can be improved by sticking the carbon fiber plate, but the rigidity improvement effect in the elastic stress stage is not obvious;
(2) the carbon fiber plate can be bonded to inhibit cracks in the later loading stage, but the effect of improving the cracking bending moment and improving the early cracking is not obvious;
(3) the carbon fiber reinforced composite material has insufficient ductility and uneven internal force distribution. The insufficient ductility of the material directly leads to the insufficient ductility of the component, and the excessive deformation of the component leads to the brittle fracture of the fiber composite material, thereby leading to the brittle failure of the structure;
(4) although the carbon fiber has excellent mechanical properties and physical and chemical properties, the carbon fiber is expensive, so that the production cost is high and the competitiveness is poor.
Disclosure of Invention
According to the technical problem, the bridge reinforcing device based on the high polymer metal composite material plate and the manufacturing method thereof are provided. The invention is applied to the maintenance and the reinforcement of the bridge. Fatigue cracks are easy to generate at the flat and longitudinal joints of the bridge, and the device is welded at the dangerous points of the joints to prevent the joints from bending out of the plane, so that the local fatigue resistance is improved, the fatigue cracks are prevented from expanding, and the overall strength and the rigidity of the beam connecting plate are improved. The reinforcing device can obviously improve the bearing capacity of the metal structure, so that the reinforcing device is very suitable for reinforcing and repairing the steel bridge structure.
The technical means adopted by the invention are as follows:
a bridge reinforcing device based on a high polymer metal composite plate comprises a longitudinal beam and a cross beam connected with the longitudinal beam through a connecting plate, wherein the connecting plate is vertically connected with the cross beam; the upper wing plate and the connecting plate of the cross beam are respectively provided with an L-shaped steel plate fixedly connected with the upper wing plate and the connecting plate, and peripheral steel sheets are arranged between the L-shaped steel plate and the upper wing plate and between the L-shaped steel plate and the connecting plate of the cross beam; the L-shaped steel plate is provided with 3 exhaust holes and 1 pouring hole, and a high polymer material interlayer is poured in the pouring hole.
Furthermore, the exhaust hole and the pouring hole are respectively engraved with threads and are respectively used for connecting a high polymer material pouring valve and an exhaust valve.
And furthermore, when the high polymer material interlayer is poured in the pouring hole, a guard beam is arranged on the outer surface of the L-shaped steel plate.
Further, the guard beam is adsorbed on the outer surface of the L-shaped steel plate through a magnet.
Further, the polymer material interlayer comprises a component A polymer material and a component B polymer material;
the component A high polymer material comprises the following components in parts by weight: 30-40 parts of castor oil, 60-70 parts of polyester polyol, 5-10 parts of micromolecular polyol, 1-1.5 parts of coupling agent and 0.5-1 part of auxiliary agent;
the component B is a polyisocyanate.
Further, the component A polymer material and the component B polymer material are mixed according to the mol ratio of NCO/OH which is 1.0-1.2.
Further, the polyester polyol includes, but is not limited to, one or a mixture of polycaprolactone diol, polycaprolactone triol and polytetrahydrofuran diol.
The invention also provides a manufacturing method of the bridge reinforcing device based on the high polymer metal composite material plate, which comprises the following steps:
s1, fixing the peripheral steel sheets on the upper wing plate and the connecting plate of the cross beam in a welding or steel structure adhesive filling mode, and meanwhile, fixedly connecting the L-shaped steel sheets on the peripheral steel sheets to keep the interior to form an L-shaped cavity;
s2, drilling 4 holes in the L-shaped steel plate on one side, wherein threads are carved in the 4 holes, one of the 4 holes is set as a pouring hole and is connected with a high polymer material pouring valve; the other 3 are arranged as exhaust holes and connected with an exhaust valve;
s3, placing a guard beam on the outer surface of the L-shaped steel plate, and adsorbing the guard beam on the outer surface of the L-shaped steel plate by using a magnet;
s4, connecting an exhaust funnel, mixing the two-component materials, and injecting the mixture into the L-shaped cavity through a pouring hole to fill the cavity with the high polymer material to form a high polymer material interlayer; after pouring, taking down the exhaust funnel, and controlling the pouring time within 10 minutes;
and S5, after the pouring is finished, the guard beam is kept on the surface of the L-shaped steel plate for 1 hour and then is taken down.
Compared with the prior art, the invention has the following advantages:
1. the bridge reinforcing device provided by the invention has the advantages that the local fatigue resistance is improved, the fatigue crack is prevented from expanding, and the overall strength and rigidity of the cross beam are improved.
2. Compared with a reinforced steel structure and a steel-concrete combined structure, the bridge reinforcing device provided by the invention has the advantage that the load transmission is more uniform.
3. According to the bridge reinforcing device provided by the invention, the polymer material interlayer has a larger damping coefficient, and the vibration absorption characteristic of the original structure is obviously improved.
4. Compared with a carbon fiber reinforced composite material, the bridge reinforcing device provided by the invention has the advantages that the cost of the high polymer material interlayer is lower, and the economical efficiency of use and maintenance can be obviously improved.
5. The bridge reinforcing device provided by the invention has the advantages of simple structure and process, light weight and short production period.
Based on the reasons, the invention can be widely popularized in the fields of bridge reinforcement and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of fatigue cracks at a connecting plate of a conventional cross beam.
Fig. 2 is a three-dimensional shape diagram of the bridge reinforcing device of the present invention.
Fig. 3 is a schematic view of the connection mode of the bridge reinforcing device of the present invention.
In the figure: 1. a stringer; 2. a connecting plate; 3. a cross beam; 4. an L-shaped steel plate; 5. peripheral steel sheets; 6. an exhaust hole; 7. pouring holes; 8. a polymer material interlayer.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
The flat longitudinal connection structure of the steel-framed bridge is easy to generate fatigue cracks under the action of cyclic load, as shown in figure 1, for example, a royal canyon large bridge has 40 flat longitudinal connection members, wherein, 80 percent of the members have cracks, as shown in figure 1, the cracks start from the top end of a welding seam of a connecting plate and a web plate of a cross beam, and vertically extend downwards under the action of cyclic tensile load caused by traffic. No matter at the connection part of the longitudinal beam to the cross beam or the connection part of the cross beam to the supporting beam, the cracks can cause structural damage to a certain extent, and the bridge safety is threatened.
In order to solve the problems, the invention provides a bridge reinforcing device based on a polymer metal composite plate, which comprises a longitudinal beam 1 and a cross beam 3 connected with the longitudinal beam 1 through a connecting plate 2, wherein the connecting plate 2 is vertically connected with the cross beam 3; the upper wing plate and the connecting plate 2 of the cross beam 3 are respectively provided with an L-shaped steel plate 4 fixedly connected with the cross beam, and a peripheral steel sheet 5 is arranged between the L-shaped steel plate 4 and the upper wing plate and the connecting plate 2 of the cross beam 3; the L-shaped steel plate 4 is provided with 3 exhaust holes 6 and 1 pouring hole 7, and a high polymer material interlayer 8 is poured in the pouring hole 7. And when the high polymer material interlayer 8 is poured in the pouring hole 7, the outer surface of the L-shaped steel plate 4 is provided with a guard beam. The guard beam is adsorbed on the outer surface of the L-shaped steel plate 4 through a magnet.
Further, as a preferred embodiment of the present invention, the exhaust hole 6 and the casting hole 7 are respectively engraved with threads for connecting a high polymer material casting valve and an exhaust valve.
In a further preferred embodiment of the present invention, the metal structures of the present invention are made of low-cost steel materials, such as Q235, Q234, etc., by a stamping process.
As a further preferable embodiment of the present invention, the polymer material interlayer 8 includes a component a polymer material and a component B polymer material;
the component A high polymer material comprises the following components in parts by weight: 30-40 parts of castor oil, 60-70 parts of polyester polyol (the polyester polyol comprises but is not limited to one or a mixture of more of polycaprolactone diol, polycaprolactone triol and polytetrahydrofuran diol), 5-10 parts of micromolecule polyol, 1-1.5 parts of coupling agent and 0.5-1 part of auxiliary agent;
the component B is a polyisocyanate.
Further, as a preferred embodiment of the present invention, the a-component polymer material and the B-component polymer material are mixed in a molar ratio NCO/OH of 1.0 to 1.2.
The invention also provides a manufacturing method of the bridge reinforcing device based on the high polymer metal composite material plate, which comprises the following steps:
s1, fixing the peripheral steel sheets 5 on the upper wing plates of the cross beam 3 and the connecting plate 2 by adopting a welding or steel structure adhesive filling mode, and simultaneously fixedly connecting the L-shaped steel sheets 4 on the peripheral steel sheets 5 to keep the interior to form an L-shaped cavity;
s2, drilling 4 holes in the L-shaped steel plate 4 on a single side, wherein threads are carved in the 4 holes, one of the 4 holes is set as a pouring hole 7 and is connected with a high polymer material pouring valve; the other 3 are provided with exhaust holes 6 which are connected with an exhaust valve;
s3, placing a guard beam on the outer surface of the L-shaped steel plate 4, and adsorbing the guard beam on the outer surface of the L-shaped steel plate 4 by using a magnet;
s4, connecting an exhaust funnel, mixing the two-component materials, and injecting the mixture into the L-shaped cavity through a pouring hole to fill the cavity with the high polymer material to form a high polymer material interlayer 8; after pouring, taking down the exhaust funnel, and controlling the pouring time within 10 minutes;
and S5, after the pouring is finished, the guard beam is kept on the surface of the L-shaped steel plate 4 for 1 hour and then is taken down.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A bridge reinforcing device based on a high polymer metal composite plate comprises a longitudinal beam (1) and a cross beam (3) connected with the longitudinal beam (1) through a connecting plate (2), wherein the connecting plate (2) is vertically connected with the cross beam (3); the beam is characterized in that an L-shaped steel plate (4) fixedly connected with the beam is respectively arranged on an upper wing plate of the beam (3) and a connecting plate (2), and a peripheral steel sheet (5) is arranged between the L-shaped steel plate (4) and the upper wing plate of the beam (3) and the connecting plate (2); the L-shaped steel plate (4) is provided with 3 exhaust holes (6) and 1 pouring hole (7), and a high polymer material interlayer (8) is poured in the pouring hole (7).
2. The bridge reinforcing device based on polymer metal composite material plates is characterized in that the exhaust holes (6) and the pouring holes (7) are respectively engraved with threads and are respectively used for connecting polymer material pouring valves and exhaust valves.
3. The bridge reinforcing device based on polymer metal composite material plates as claimed in claim 1 or 2, wherein when the polymer material interlayer (8) is poured in the pouring hole (7), a guard beam is arranged on the outer surface of the L-shaped steel plate (4).
4. The bridge reinforcing device based on the polymer metal composite material plate is characterized in that the guard beam is adsorbed on the outer surface of the L-shaped steel plate (4) through a magnet.
5. The bridge reinforcing apparatus based on polymer metal composite plate according to claim 1, wherein the polymer material interlayer (8) comprises a component A polymer material and a component B polymer material;
the component A high polymer material comprises the following components in parts by weight: 30-40 parts of castor oil, 60-70 parts of polyester polyol, 5-10 parts of micromolecular polyol, 1-1.5 parts of coupling agent and 0.5-1 part of auxiliary agent;
the component B is a polyisocyanate.
6. The bridge reinforcing device based on the polymer metal composite material plate as claimed in claim 5, wherein the A-component polymer material and the B-component polymer material are mixed in a molar ratio NCO/OH of 1.0-1.2.
7. The bridge reinforcing device based on polymer metal composite material plate of claim 5, wherein the polyester polyol comprises but is not limited to one or a mixture of polycaprolactone diol, polycaprolactone triol and polytetrahydrofuran diol.
8. A method of manufacturing a bridge girder reinforcing apparatus according to any one of claims 1 to 7, comprising the steps of:
s1, fixing the peripheral steel sheets (5) on the upper wing plates of the cross beam (3) and the connecting plate (2) in a welding or steel structure adhesive filling mode, and meanwhile, fixedly connecting the L-shaped steel sheets (4) on the peripheral steel sheets (5) to keep the interior to form an L-shaped cavity;
s2, drilling 4 holes in the L-shaped steel plate (4) on a single side, wherein threads are engraved in the 4 holes, one of the 4 holes is set as a pouring hole (7) and is connected with a high polymer material pouring valve; the other 3 are provided with exhaust holes (6) which are connected with exhaust valves;
s3, placing a guard beam on the outer surface of the L-shaped steel plate (4), and adsorbing the guard beam on the outer surface of the L-shaped steel plate (4) by using a magnet;
s4, connecting an exhaust funnel, mixing the two-component materials, and injecting the mixture into the L-shaped cavity through a pouring hole to fill the cavity with the high polymer material to form a high polymer material interlayer (8); after pouring, taking down the exhaust funnel, and controlling the pouring time within 10 minutes;
and S5, after the pouring is finished, the guard beam is kept on the surface of the L-shaped steel plate (4) for 1 hour and then is taken down.
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