WO2021182291A1 - Passerelle - Google Patents

Passerelle Download PDF

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Publication number
WO2021182291A1
WO2021182291A1 PCT/JP2021/008416 JP2021008416W WO2021182291A1 WO 2021182291 A1 WO2021182291 A1 WO 2021182291A1 JP 2021008416 W JP2021008416 W JP 2021008416W WO 2021182291 A1 WO2021182291 A1 WO 2021182291A1
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WIPO (PCT)
Prior art keywords
resin
tread
tread plate
foam layer
weight
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PCT/JP2021/008416
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English (en)
Japanese (ja)
Inventor
後藤　敏晴
遊佐　敦
水谷　圭
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マクセルホールディングス株式会社
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Publication of WO2021182291A1 publication Critical patent/WO2021182291A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/04—Layered products comprising a layer of synthetic resin as impregnant, bonding, or embedding substance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00—Component parts or accessories for scaffolds
    • E04G5/08—Scaffold boards or planks

Definitions

  • This disclosure relates to treads including scaffolding treads used at building construction sites and the like.
  • Scaffolding treads used at building construction sites are often made of metal such as iron and aluminum.
  • Metal treads are relatively heavy. Therefore, the metal treads increase the cost burden for transportation, installation, removal, etc., and the physical burden on the workers.
  • a tread structure for the purpose of weight reduction is provided.
  • the scaffolding structure can secure the strength by providing the skin member, since the core member is foamed rigid polyurethane, there may still be a problem in strength.
  • the treads according to the present disclosure may include a plurality of tread members arranged side by side in the width direction.
  • Each tread member may include a resin foam layer and a fiber reinforced resin layer laminated on the main surface of the resin foam layer.
  • the breaking load (Wcc) of each tread member may be Wcc> 980 Lc (N), where Lc is the distance between the fulcrums in the length direction of the tread member.
  • FIG. 1 is an external perspective view showing the structure of the tread plate according to the embodiment.
  • FIG. 2 is an external perspective view showing the structure of the tread plate member among the tread plates shown in FIG. 1.
  • the treads may include a plurality of tread members arranged side by side in the width direction.
  • Each tread member may include a resin foam layer and a fiber reinforced resin layer laminated on the main surface of the resin foam layer.
  • the breaking load (Wcc) of each tread member may be Wcc> 980 Lc (N), where Lc is the distance between the fulcrums in the length direction of the tread member.
  • Each tread member can secure the strength of Wcb> 980Lc (N), which is a relatively high breaking load. Further, the weight can be reduced by forming bubbles in the resin foam layer. In this way, the treads in which a plurality of tread members are arranged side by side in the width direction can improve the strength while reducing the weight.
  • the resin foam layer may contain 50% by weight or more of the polycarbonate resin with respect to the resin foam layer.
  • the tread plate member can obtain sufficient strength.
  • the fiber reinforced resin layer may contain 50% by weight or more of the polycarbonate resin with respect to the resin contained in the fiber reinforced resin layer.
  • the resin foam layer and the resin contained in the fiber reinforced resin layer may each have a sea-island structure containing a polycarbonate resin as a sea component.
  • the resin contained together with the polycarbonate resin is formed inside the resin foam layer and the fiber reinforced resin layer as island components, and the surface of the main surface of the resin foam layer and the fiber reinforced resin layer is a sea component polycarbonate resin. Is exposed a lot.
  • the adhesiveness between the resin foam layer and the fiber-reinforced resin layer can be improved due to the compatibility between the polycarbonate resins. As a result, it is possible to suppress the peeling of the fiber reinforced resin layer from the resin foam layer, and it is possible to further improve the strength of the tread member.
  • the fiber reinforced resin layer may be laminated on both sides of the main surface of the resin foam layer.
  • the bending strength can be improved against the stress applied from the vertical direction to the main surface of the tread member.
  • the tread may further include a frame.
  • the frame may include one selected from the group consisting of metals, carbon fibers, inert particles and fiber reinforced plastics.
  • the plurality of tread members may be arranged inside the frame with both ends supported by the frame in the length direction orthogonal to the width direction. Thereby, a plurality of tread plate members can be reinforced.
  • the tread plate 1 for scaffolding used at the construction site of a building can be mentioned as an example.
  • the scaffolding tread plate 1 will be described as the tread plate 1.
  • the tread plate 1 can also be used as a ladder, a stepladder, a foldable scaffold, and a tread plate 1 such as a part of the floor of an automobile, a train, a bus, or the like. That is, in the present specification, the tread plate 1 means not only the tread plate 1 for scaffolding but also a plate material on which a person's foot is pressed from above when walking or the like.
  • each tread member 2 includes a resin foam layer 21 and a fiber reinforced resin layer 22.
  • the resin foam layer 21 contains 50% by weight or more of polycarbonate resin.
  • the resin contained in the resin foam layer 21 may contain 100% by weight of the polycarbonate resin, may be a compound resin of the polycarbonate resin and at least one of the other resin and the inert particles, or may be a copolymerized polycarbonate resin.
  • Other resins include ABS resin, AS resin, acrylic resin, polyester resin (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycyclohexanedimethylene terephthalate, polybutylene naphthalate, etc.), PPS resin, polyphenylene ether resin, polyether.
  • the other resins may be used alone or in combination of two or more.
  • the polycarbonate resin since the polycarbonate resin has a high melt viscosity and low fluidity, it is difficult for the physical foaming agent to be mixed and it is difficult to secure a high foaming ratio of the foamed molded product. Further, when the polycarbonate resin is physically foamed, it is plasticized only by adding a foaming agent, so that the melt viscosity tends to decrease, but the viscosity increases when the cooling step after the foaming treatment is started. Therefore, as will be described later, when the polycarbonate resin is extruded from the die of the extruder for molding, air bubbles near the surface of the resin foam layer 21 may be broken and the surface may be roughened. As described above, the polycarbonate resin may have a problem in moldability.
  • a polycarbonate resin having a low viscosity average molecular weight (including a resin obtained by blending a polycarbonate resin having a high viscosity average molecular weight with a polycarbonate resin having a low viscosity average molecular weight) is used, or a resin having good fluidity is used.
  • an additive such as a filler to secure the fluidity.
  • a polycarbonate resin having an excessively low viscosity average molecular weight is used, the strength of the resin foam layer 21 may decrease.
  • the polycarbonate resin is preferably 90% by weight or less, more preferably 80% by weight or less.
  • the other resin having good fluidity is at least one selected from the group consisting of polyester resin (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), ABS resin, AS resin, polypropylene resin, and acrylic resin. Two resins can be mentioned. From the viewpoint of improving the strength, the content of the polycarbonate resin contained in the resin foam layer 21 is preferably 100% by weight.
  • Aromatic dihydroxy compounds such as 4-hydroxyphenyl) methane, 1,1-bis (p-hydroxyphenyl) ethane, 2,2-bis (p-hydroxyphenyl) butane; ethylene glycol, 1,2-propylene glycol, 3 Examples thereof include aliphatic dihydroxy compounds such as -methyl-1,5-pentanediol, 1,6-hexanediol, 1,3-propanediol, and 1,4-butanediol. These dihydroxy compounds may be used alone or in combination of two or more.
  • the polycarbonate resin may contain a structural unit derived from a monohydroxy compound, a trihydroxy compound, or the like.
  • the polypropylene resin can improve the foaming characteristics of the polycarbonate resin, that is, improve the fluidity and increase the foaming ratio, so that the tread plate can be formed.
  • the weight of the member 2 can be reduced.
  • the foaming ratio can be increased as in the case where the polypropylene resin is contained, so that the tread member 2 should be reduced in weight. Can be done.
  • the tread member 2 can maintain the strength because the polyester resin has the same strength as the polycarbonate resin.
  • the tread plate member 2 can determine the resin to be combined with the polycarbonate resin depending on whether the weight reduction or the strength is emphasized. Even when the weight is reduced, the resin foam layer 21 contains 50% by weight or more of the polycarbonate resin, so that sufficient strength, which will be described later, is ensured.
  • the resin foam layer 21 is foam-molded.
  • the resin foam layer 21 has a foaming ratio of 1.2 to 4 times.
  • the foaming ratio is preferably 1.2 times or more, preferably 1.5 times or more, more preferably 2 times or more. It is preferably fold or less, preferably 3.5 times or less, and more preferably 3 times or less.
  • the viscosity average molecular weight of the polycarbonate resin is 10,000 to 100,000. If the viscosity average molecular weight of the polycarbonate resin is too high, the viscosity increases and the torque required for the extruder described later increases, making extrusion processing difficult. As a result, if the molecular weight of the resin is increased, the strength of the molded product after processing can be improved, but the production itself is hindered. On the other hand, if the viscosity average molecular weight of the polycarbonate resin is too low, the bubbles tend to coalesce and the bubble diameter does not become uniform, so that the strength after curing decreases. In addition, the decrease in melt tension makes it difficult to foam.
  • the viscosity average molecular weight of the polycarbonate resin is preferably 10,000 or more, preferably 15,000 or more, and preferably 100,000 or less, preferably 50,000 or less. That is, by setting the viscosity average molecular weight of the polycarbonate resin to 10,000 to 100,000, it is possible to obtain the effects of improving the strength and reducing the weight of the tread plate member 2 while facilitating molding.
  • the viscosity average molecular weight of the polycarbonate resin may be obtained by mixing a resin having a viscosity average molecular weight of less than 15,000 or more than 50,000.
  • a resin having a viscosity average molecular weight of less than 15,000 or more than 50,000 for example, an aromatic polycarbonate resin having a viscosity average molecular weight of more than 50,000 improves the entropy elasticity of the resin, and thus exhibits good molding processability in foam molding of the resin foam layer 21. Such improvement in molding processability is even better than that of branched polycarbonate.
  • the viscosity average molecular weight in the present disclosure is calculated as follows. First, using an Ostwald viscometer, the specific viscosity ( ⁇ SP ) is calculated from a solution in which 0.7 g of aromatic polycarbonate (resin contained in the resin foam layer 21) is dissolved in 100 ml of methylene chloride at 20 ° C. The specific viscosity can be calculated by the formula ⁇ (t-t 0 ) / t 0 ⁇ . t 0 is the number of seconds for the methylene chloride (solvent) to fall, and t is the falling speed of the sample solution.
  • c in the formula is the concentration of aromatic polycarbonate (0.7%).
  • the fiber reinforced resin layer 22 is a fiber reinforced resin sheet containing fibers, and is laminated on both sides of the main surface of the resin foam layer 21. That is, the resin foam layer 21 is arranged between the two fiber reinforced resin layers 22.
  • the fiber-reinforced resin layer 22 is formed in a shape substantially similar to the shape of the main surface of the resin foam layer 21.
  • the tread plate member 2 can improve the bending strength against the stress applied from the vertical direction to the main surface of the tread plate member 2. That is, the fiber-reinforced resin layer 22 functions as a reinforcing material for the resin foam layer 21.
  • one fiber reinforced resin layer 22 may be laminated on the main surface of one side of the resin foam layer 21.
  • the fibers contained in the fiber reinforced resin layer 22 are carbon fibers, glass fibers, aramid fibers, polyester fibers, acrylic fibers, polyethylene fibers, polypropylene fibers, hollow metal fibers and the like. Hollow metal fibers are stainless steel, steel and the like.
  • the fibers contained in the fiber-reinforced resin layer 22 are not limited to these, and other fiber materials may be used.
  • the texture of the fibers contained in the fiber reinforced resin layer 22 is more preferably 100 g / m 2 or more, preferably 175 g / m 2 or more, more preferably from the viewpoint of balancing the improvement of strength and the weight reduction. Is preferably 250 g / m 2 or more, 500 g / m 2 or less, preferably 425 g / m 2 or less, and more preferably 350 g / m 2 or less.
  • the breaking load (Wcb) of each tread member 2 configured in this way is 980 Lc (N), where Lc is the distance between the fixed ends where both ends of the tread member 2 in the length direction are fixed. (Wcb> 980Lc (N)), and even if the tread member 2 is destroyed near the center, it is considered that the worker can be supported.
  • Wcb> 980Lc can be calculated as follows.
  • 980Lc (N) is referred to as required yield strength.
  • the tread plate member 2 is in a state of both end support beams in which both end portions of the tread plate member 2 are supported by the frame 3 in a state where the tread plate member 2 is not destroyed.
  • the length of the support beams at both ends (distance between fulcrums) is Lc
  • the load applied to the tip of the cantilever is at most 1/2 of the body weight of the worker. That is, assuming that the weight of the worker is 100 kg, which is relatively heavier than the average weight of a Japanese man, the load applied to the tip of the cantilever is 50 kg. Based on these conditions, the relational expression of ⁇ L ⁇ 50 (kg) ⁇ 9.8 ⁇ Wccb ⁇ Lc / 4 ⁇ (Equation 5) is established from (Equation 4).
  • the breaking load Wcc of the both ends support beam with the length Lc of both ends support beam being 1 m can be expressed by ⁇ Wcc> L ⁇ 50 ⁇ 9.8 ⁇ 4 ⁇ (Equation 6). When this is calculated, it becomes ⁇ Wcc> 1960L (N) ⁇ (Equation 7). Further, since the length L of the cantilever beam is Lc / 2, the breaking load Wcc of the support beam at both ends can be expressed by ⁇ Wcc> 980Lc (N) ⁇ (Equation 8).
  • each tread member 2 can secure the strength capable of supporting the worker as described above by obtaining a relatively high breaking load of Wcb> 980 Lc (N), and the resin foam layer 21 Weight reduction can be achieved by forming bubbles.
  • the resin foam layer 21 has an apparent density of 0.3 to 0.8 when it contains 100% by weight of the polycarbonate resin.
  • the polycarbonate resin has an apparent density of 1.2. Therefore, when the apparent density of the foamed polycarbonate resin is 0.3 to 0.8, the foaming ratio of the resin foamed layer 21 is 1.5 to 4 times.
  • Each tread member 2 has a width of 5 to 500 mm.
  • the width of the tread member 2 is about the same as the average shoulder width of a worker (Japanese male), or smaller than the average shoulder width of a worker.
  • the plurality of tread plate members 2 are arranged side by side in the width direction. That is, the tread plate 1 is destroyed even if one tread plate member 2 is destroyed by forming each tread plate member 2 with the above-mentioned width and further arranging the tread plate members 2 side by side in the width direction. Workers can be supported by the tread plate members 2 on both sides of the tread plate member 2. Further, as described above, each tread plate member 2 has excellent strength that can support the worker even in the state of a cantilever.
  • the frame 3 has a substantially rectangular shape in a plan view.
  • the frame 3 has a pair of facing frame members 31 and a pair of facing frame members 32.
  • the frame member 31 has a substantially L-shaped cross section due to the flange portion 31a and the wall portion 31b. Each of the pair of frame members 31 is arranged so that the flange portion 31a is inside the wall portion 31b.
  • the frame member 32 is formed in a flat plate shape.
  • a plurality of partition plates 33 are provided on the upper surface of the flange portion 31a of one of the frame members 31.
  • a partition plate 33 is provided on the upper surface of the flange portion 31a of the other frame member 31 at a position facing the partition plate 33 provided on the one flange portion 31a.
  • Frame 3 contains one selected from the group consisting of metals, carbon fibers, inert particles and fiber reinforced plastics.
  • the frame 3 may contain one of these materials, or may contain two or more of them. With such a configuration, the frame 3 can obtain the strength to support the plurality of tread plate members 2.
  • the tread plate member 2 is fitted in a region surrounded by a wall portion 31b, a partition plate 33, and a flange portion 31a.
  • each of the tread plate members 2 is positioned by partition plates 33 provided at the four corners of the tread plate member 2, except for the tread plate member 2 adjacent to the frame member 32. That is, two partition plates 33 are provided on one frame member 31 side between the tread plate member 2 and the tread plate member 2 adjacent to the tread plate member 2.
  • the tread plate member 2 adjacent to the frame member 32 is fitted in a region surrounded by the frame member 32, the partition plate 33, the flange portion 31a, and the wall portion 31b.
  • the end portion of the tread plate member 2 facing the frame member 31 in the length direction is supported by the flange portion 31a. In this way, a plurality of tread plate members 2 are attached to the inside of one frame 3.
  • the tread plate member 2 can be reinforced and a plurality of tread plate members 2 can be arranged side by side in the width direction.
  • a gap is formed by interposing a partition plate 33 between the tread plate member 2 and the tread plate member 2 adjacent to the tread plate member 2.
  • the tread plate 1 can be reduced in weight. Further, depending on the place where the tread plate 1 is attached, the air permeability can be improved.
  • One tread plate member 2 may be arranged inside the frame 3, or a plurality of tread plate members 2 may be arranged. Further, the frame member 31 may also have a substantially L-shaped cross section. Further, the partition plate 33 may be provided with one partition plate 33 between adjacent tread plate members 2 on one frame member 31 side.
  • the partition plate 33 is not limited to the above-described configuration as long as it can partition the adjacent tread plate members 2 and facilitate the positioning when the tread plate members 2 are fitted. Further, the partition plate 33 may be provided with one or a plurality of partition plates 33 on one of the frame members 31 depending on the number of tread plate members 2 attached to the inside of the frame 3. Further, the tread plate member 2 can be attached without providing the partition plate 33 inside the frame 3.
  • the frame 3 is not particularly limited as long as it can support both ends of the plurality of tread members 2 in the length direction and the plurality of tread members 2 can be arranged in the width direction.
  • the polycarbonate resin When a load is applied, the polycarbonate resin is plastically deformed by yielding and then fractured, but the amount of plastic deformation from yielding to fracture is large. Therefore, the polycarbonate resin does not break immediately after yielding and has a tenacious property. As a result, if the deformation of the tread plate member 2 is detected, the risk caused by the subsequent destruction of the tread plate member 2 can be dealt with with a margin.
  • the resin foam layer 21 contains 50% by weight or more of the polycarbonate resin, so that the sea-island structure is formed by the polycarbonate resin and the resin contained together with the polycarbonate resin. That is, the resin foam layer 21 has a sea-island structure in which the polycarbonate resin is a sea component and the resin contained together with the polycarbonate resin is an island component.
  • the fiber-reinforced resin layer 22 includes a resin (a compound resin of a polycarbonate resin and at least one of another resin and inert particles, a copolymerized polycarbonate resin, or another resin) contained in the fiber-reinforced resin layer 22. 50% by weight or more of the polycarbonate resin may be contained with respect to the blended polycarbonate resin).
  • the resin contained in the fiber-reinforced resin layer 22 is the same as the resin contained in the resin foam layer 21 described above, and thus the description thereof will be omitted.
  • a sea-island structure in which the polycarbonate resin is a sea component and the resin contained together with the polycarbonate resin is an island component is formed as in the resin foam layer 21. Will be done.
  • the fiber-reinforced resin layer 22 is bonded to the main surface of the resin foam layer 21, as will be described later, the resin foam layer 21 and the fiber-reinforced resin layer 22 are adhered to each other due to the compatibility between the polycarbonate resins.
  • the sex can be improved.
  • the fiber-reinforced resin layer 22 can be prevented from peeling from the resin foam layer 21, and the strength of the tread member 2 can be further improved.
  • the amount of the polycarbonate resin contained in each of the resin foam layer 21 and the fiber reinforced resin layer 22 is 50% by weight or more, preferably 60% by weight or more, and more preferably 70% by weight or more, as described above. Is good.
  • the resin foam layer 21 of the tread plate member 2 is molded by a deformed extrusion molding method. Specifically, first, in an extruder such as a screw, the pellets of polycarbonate resin and other resins, for example, pellets of polypropylene resin, inert particles, etc. are heated and melted, and the polycarbonate resin is 50% by weight or more. The molten resin material is produced by mixing so as to be. The blending ratio of 50% by weight or more of the polycarbonate resin (pellets) is a ratio to the weight including other resins (pellets) and inert particles charged into the extruder. Further, in the extruder, at least one of the chemical foaming agent and the physical foaming agent is injected into the produced molten resin material, and the molten resin material and the foaming agent are mixed.
  • an extruder such as a screw
  • the pellets of polycarbonate resin and other resins for example, pellets of polypropylene resin, inert particles, etc.
  • the molten resin material mixed with the foaming agent is poured into a die, and the resin foam layer 21 is formed while gradually lowering the temperature by passing the die.
  • the die is open in the direction of extruding the molten resin material.
  • bubbles are generated in the molten resin material mixed with the foaming agent due to the pressure drop when passing through the die.
  • the resin foam layer 21 is foam-molded.
  • the fiber reinforced resin layer 22 can be attached to the main surface of the resin foam layer 21. That is, the fiber reinforced resin layer 22 is attached to the main surface of the resin foam layer 21 before being cured by cooling without using an adhesive.
  • the fiber reinforced resin layer 22 is formed by impregnating the resin with a fiber material woven by plain weave or the like.
  • the method for producing the fiber reinforced resin layer 22 is not particularly limited. In the method of bonding the fiber reinforced resin layer 22 to the main surface of the resin foam layer 21, a solvent capable of dissolving the polycarbonate resin is applied to the surface of either the resin foam layer 21 or the fiber reinforced resin layer 22 or facing each other. An appropriate amount may be applied to both surfaces, and the two may be bonded together and then dried.
  • the shape of the resin foam layer 21 and the fiber reinforced resin layer 22 is adjusted while being cooled in the cooling tank. In this state, the resin foam layer 21 and the fiber reinforced resin layer 22 are formed in a continuous plate shape. Therefore, these are cut to a predetermined size.
  • tread plate members 2 are arranged side by side along the width direction inside the above-mentioned frame 3. In this way, the tread plate 1 can be created.
  • the tread members of Examples 1 to 4 and the tread members of Comparative Examples 1 to 4 are each formed in a rectangular plate shape in a plan view, and the width, length, and thickness are as shown in Table 1. .. Further, in Table 1, PC means a polycarbonate resin, ABS means an ABS resin, PP means a polypropylene resin, CFRTP means a carbon fiber reinforced resin, and GFRTP means a glass fiber. Indicates reinforced resin. The PC resin ratio indicates the ratio of the polycarbonate resin contained in the resin foam layer.
  • the viscosity average molecular weight of the polypropylene resin is 100,000.
  • the viscosity average molecular weight of the polycarbonate resin was adjusted to 25,000 by blending a polycarbonate resin having a viscosity average molecular weight of 10,000 and a polycarbonate resin having a viscosity average molecular weight of 300,000. Further, as CFRTP, a prepreg "TPWF E3163 (manufactured by Teijin Limited)" was used, in which a 200 g / m 2 plain weave woven fabric was impregnated with a polycarbonate resin and the content of the woven fabric was 50% by weight.
  • GFRTP As GFRTP, a 360 g / m 2 plain weave woven fabric (glass cloth WE181D100BS6B manufactured by Nitto Boseki Co., Ltd.) impregnated with an epoxy resin and having a woven fabric content of 30% by weight was used.
  • the expanded polypropylene resin is polypropylene Sumitomo Noblen FS2011DG3 manufactured by Sumitomo Chemical Co., Ltd.
  • Example 4 the alloy of the polycarbonate resin and the ABS resin contained in the resin foam layer is a PC / ABS alloy grade "T2754" manufactured by Teijin Limited. T2754 contains 50 parts of polycarbonate resin, 45 parts of ABS resin, and 5 parts of additives. That is, the resin foam layer of Example 4 contains 50% by weight of the polycarbonate resin.
  • the alloy of the polycarbonate resin and the polypropylene resin contained in the resin foam layer was 77 parts of "Panlite L-1250WQ” manufactured by Teijin Co., Ltd. as the polycarbonate resin and "SunAllomer” manufactured by SunAllomer Ltd. as the polypropylene resin. 23 parts of "PL400A”, 7 parts of Septon 2104, which is a styrene-ethylene / propylene-styrene block copolymer manufactured by Kuraray Co., Ltd., and 130 parts of Tarku HST 0.8 manufactured by Hayashi Kasei Co., Ltd. as inert particles. (“Panlite”, “SunAllomer” and “Septon” are registered trademarks). That is, the resin foam layer of Comparative Example 4 contains about 32.5% by weight of the polycarbonate resin.
  • the fracture load test was carried out by using a full-scale strength tester (AC-2000SIV manufactured by Tokyo Koki Co., Ltd.) and attaching a bending fulcrum manufactured for the tread member to the full-scale strength tester.
  • As the bending fulcrum a round bar having a diameter of 50 mm was divided in half to form a semi-cylindrical shape, and both ends of the tread member in the length direction were placed on the curved surface side to form a fulcrum.
  • the test was carried out by a three-point load method in which the distance between the fulcrums at both ends of the tread member was 100 cm and the displacement was applied to the center at a crosshead speed of 2 cm / min.
  • the breaking load (N) shown in Table 1 above was obtained from the measured value of the load and the measured value of the displacement amount.
  • the required proof stress in Table 1 is calculated based on the above (Equation 8). For example, since the tread member of the first embodiment has a length of 1800 mm, the required proof stress 1764 (N) can be calculated by calculating ⁇ 980 ⁇ 1.8 (m) ⁇ .
  • the tread members of Examples 1 to 4 had a fracture load larger than the required proof stress. Therefore, when a worker comes and goes on the upper surface of the tread member of Examples 1 to 4 and is destroyed at the center in the length direction, even one tread member whose length is halved can withstand the load of the worker. Can be done. Even if the tread member is destroyed near the center in the length direction, it is considered that the tread member is not completely damaged and is only destroyed to the extent that a crack in the width direction is formed in the center of the tread member in the length direction.
  • the tread members of Comparative Examples 1 to 4 had a smaller breaking load than the required proof stress. Therefore, the tread plate members of Comparative Examples 1 to 4 can be destroyed by the traffic of workers. Further, if the tread members of Comparative Examples 1 to 4 are broken near the center in the length direction, the safety of the worker cannot be surely maintained. As described in (Equation 8) above, the required proof stress (980 Lc) varies depending on the length of the tread member. Therefore, in order to improve the breaking load of the tread member, it is necessary to increase the thickness, and the weight increases accordingly. Therefore, the tread plate members of Comparative Examples 1 to 3 increase the cost burden for transportation, installation, removal, and the like.
  • the width, length and thickness of each are the same, and the composition of the fiber reinforced resin layer is different.
  • the weight was smaller and the breaking load was larger when the carbon fiber reinforced resin was used than when the glass fiber reinforced resin was used as the fiber reinforced resin layer. Therefore, it was confirmed that by using the carbon fiber reinforced resin, the weight can be further reduced and the strength can be further improved.
  • the width, length and thickness of each are the same, and the resin contained in the resin foam layer is different.
  • the tread member of Example 1 uses a polycarbonate resin for the resin foam layer, so that the breaking load satisfies the required proof stress.
  • the tread member of Comparative Example 3 uses polypropylene resin for the resin foam layer, and the breaking load is significantly less than the required proof stress. As described above, it was found that the strength can be significantly improved by forming the resin foam layer with the polycarbonate resin.
  • the tread member of Comparative Example 4 cannot withstand the load of the worker when the length of the tread member is halved. It is considered that this is because the proportion of the polycarbonate resin contained in the tread member of Comparative Example 4 was less than 50% by weight, so that the strength was significantly reduced.
  • the resin contained in each of the fiber reinforced resin layers (CFRTP) of Example 4 and Comparative Example 4 is a polycarbonate resin. As described above, when the polycarbonate resin contained in the resin foam layer is 50% by weight or more, a sea-island structure containing the polycarbonate resin as a sea component is formed. Therefore, it is considered that in Example 4, the adhesion between the resin foam layer and the fiber reinforced resin layer was improved and the strength was further improved, while in Comparative Example 4, the strength was significantly reduced.
  • the tread member of Example 1 Comparing the tread member of Example 1 and the tread member of Example 3 from the viewpoint of the adhesion between the resin foam layer and the fiber reinforced resin layer, the tread member of Example 1 has slightly stronger strength. It is considered that this is because the adhesiveness between the resin foam layer and the fiber reinforced resin layer was improved by using the same polycarbonate resin for the resin foam layer and the fiber reinforced resin layer in Example 1. In this way, it was confirmed that the strength can be further improved by allowing the same polycarbonate resin to appear on the surfaces of the resin foam layer and the fiber reinforced resin layer. It is presumed that the same can be said for the tread member of Comparative Example 3 in which the strength is significantly reduced due to the deterioration of the adhesiveness.
  • the tread members of Examples 1 to 4 were lighter than the tread members of Comparative Examples 1 to 2 and 4.
  • the tread member of Comparative Example 3 is relatively light in weight, but its strength is significantly lower than that of the tread members of Examples 1 to 4.
  • the tread members of Comparative Examples 1 to 4 need to be increased in thickness in order to improve the breaking load. Therefore, it is considered that the weight of the tread members of Comparative Examples 1 to 4 becomes even heavier when they are actually used as scaffolding.
  • the tread members of Examples 1 to 4 can withstand the load of the worker even if the length of the tread members is halved due to the relatively high breaking load of Wcb> 980 Lc (N). I was able to obtain the strength that I could. Further, it was confirmed that by setting the content of the polycarbonate resin in the resin foam layer to 50% by weight or more, a high breaking load of Wcb> 980 Lc (N) can be appropriately obtained. Further, the weight of the tread plate member is 1 to 10 kg / m 2, and the weight can be reduced as compared with Comparative Examples 1, 2 and 4.
  • the tread plate 1 is arranged by arranging a plurality of tread plate members configured in this way in the width direction. Therefore, since each tread member has the above-mentioned strength and a plurality of tread members are arranged side by side, even if one tread member is destroyed and falls, it is adjacent to each other. Tread plate members support workers. In this way, not only the strength of the tread plate members, but also by arranging a plurality of tread plate members, it is possible to take double safety measures, and it is possible to more reliably ensure the safety of workers.
  • tread plate 1 tread plate, 2 tread plate member, 21 resin foam layer, 22 fiber reinforced resin layer, 3 frame, 31 frame material, 31a flange part, 31b wall part, 32 frame material, 33 partition plate, 4 hook

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention fournit une passerelle qui est dotée d'une excellente solidité, et dont le poids est diminué. La passerelle (1) de l'invention est équipée d'une pluralité d'éléments passerelle (2) disposée de manière à être rangée dans une direction largeur. Ainsi, même si une partie d'un élément passerelle (2) est cassée, les éléments passerelle (2) des deux côtés soutiennent l'opérateur. Chaque élément passerelle (2) contient une couche de mousse en résine (21) telle qu'une résine de polycarbonate, ou similaire, et une couche de résine renforcée par des fibres (22) stratifiée sur la face principale de la couche de mousse en résine (21), telle que des fibres de carbone, ou similaire. Dans chaque élément passerelle (2), lorsque la portée dans une direction longueur de l'élément passerelle (2), est représentée par Lc, la solidité est telle que la charge de rupture (Wcb) satisfait Ｗｃｂ＞９８０Ｌｃ（Ｎ）. Ainsi, le poids est diminué, et simultanément il est possible d'améliorer la solidité de chaque élément passerelle (2), et d'améliorer la sécurité de la passerelle.
PCT/JP2021/008416 2020-03-13 2021-03-04 Passerelle WO2021182291A1 (fr)

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JP2020043610A JP2023057183A (ja) 2020-03-13 2020-03-13 足場用踏板
JP2020-043610 2020-03-13

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49146734U (fr) * 1973-04-16 1974-12-18
JPS5123228U (fr) * 1974-08-06 1976-02-20
JP2012140782A (ja) * 2010-12-28 2012-07-26 Sumitomo Rubber Ind Ltd 足場構造体
JP2013209830A (ja) * 2012-03-30 2013-10-10 East Japan Railway Co 天井内作業用床板及び天井内の移動方法
JP2014208417A (ja) * 2013-03-29 2014-11-06 積水化成品工業株式会社 繊維強化複合体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49146734U (fr) * 1973-04-16 1974-12-18
JPS5123228U (fr) * 1974-08-06 1976-02-20
JP2012140782A (ja) * 2010-12-28 2012-07-26 Sumitomo Rubber Ind Ltd 足場構造体
JP2013209830A (ja) * 2012-03-30 2013-10-10 East Japan Railway Co 天井内作業用床板及び天井内の移動方法
JP2014208417A (ja) * 2013-03-29 2014-11-06 積水化成品工業株式会社 繊維強化複合体

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