Method of manufacturing non-ferrous wall railings

Abstract

To provide a method for manufacturing a non-ferrous wall balustrade capable of manufacturing the non-ferrous wall balustrade having no possibility of corrosion by using an inexpensive general-purpose separator.SOLUTION: In the manufacturing method of the non-ferrous wall balustrade 1 for manufacturing the non-ferrous wall balustrade not using a rusting material in the concrete internal reinforcing bar by on-site construction, concrete (fresh concrete 9) is placed in a state where a non-ferrous cylindrical body 53 composed of a rust-free material is inserted into a separator 5 having a steel bar (separator body 50) for connecting forms 3 of the non-ferrous wall balustrade 1, and after the concrete is hardened, the steel bar (separator body 50) of the separator 5 is pulled out from the non-ferrous cylindrical body 53 together with the forms 3 and removed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a non-iron wall balustrade, and more particularly to a method for manufacturing a non-iron wall balustrade on-site when it is not possible to drill holes in the upper surface of a deck slab. [Background technology]

[0002] Conventionally, when constructing non-steel wall balustrades on-site, the formwork used to construct the exposed P-cone separators is made of ceramic, but the rods connecting them are made of steel rods, which have the problem of corrosion over time. While it is possible to use stainless steel for the separator's steel rods, stainless steel is not only susceptible to corrosion, but is also expensive. Therefore, there is a strong demand for a manufacturing method for non-steel wall balustrades that can solve these problems.

[0003] For example, Patent Document 1 discloses a formwork fixture that is hollow cylindrical and has a central hole, an internal thread on the inner wall surface of the central hole, one or more protrusions formed on the outer circumferential side, and is made of a molded fiber material such as polypropylene or nylon (see claim 4 in the claims of Patent Document 1, paragraphs

[0016] to

[0023] in the specification, and Figures 1 to 6 in the drawings, etc.).

[0004] However, the formwork fixture described in Patent Document 1 is made of a custom-made molded fiber material, and therefore the problem of it being significantly more expensive than a general-purpose ordinary steel separator remains. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-44186 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, the present invention has been devised in consideration of the above-mentioned problems, and its object is to provide a method for manufacturing a non-iron walled balustrade that can be manufactured using inexpensive, general-purpose separators and is free from the risk of corrosion. [Means for solving the problem]

[0007] The method for manufacturing a non-steel railing according to the first invention is a method for manufacturing a non-steel railing that does not use rusting materials for the internal reinforcement of the concrete, constructed on-site, and is characterized in that concrete is poured with a non-steel cylindrical body made of a rust-resistant material inserted into a separator having steel bars that connect the formwork of the non-steel railing, and after the concrete has hardened, the steel bars of the separator are pulled out and removed together with the formwork from the non-steel cylindrical body.

[0008] The manufacturing method for a non-steel wall balustrade according to the second invention is characterized in that, in the first invention, the supports that support the formwork when pouring concrete are hung and fixed by counterweights placed on the deck slab. [Effects of the Invention]

[0009] According to the first and second inventions, concrete is poured while a non-steel cylindrical body made of a rust-resistant material is inserted into a separator having steel rods that connect the formwork of the non-steel wall balustrade, and after the concrete has hardened, the steel rods of the separator are pulled out and removed from the non-steel cylindrical body along with the formwork.This makes it possible to manufacture a non-steel wall balustrade that is not susceptible to corrosion, even when inexpensive, general-purpose separators are used to connect the formwork.

[0010] In particular, according to the second invention, there is no need to drill holes in the deck or embed insert fittings in advance, which eliminates cross-sectional defects and eliminates the need for fittings that may rust, improving the durability of not only the wall parapet but also the deck. [Brief explanation of the drawings]

[0011] [Figure 1]FIG. 1 is a process explanatory diagram showing the deck slab installation process of the manufacturing method for the non-iron wall balustrade according to this embodiment. [Figure 2] FIG. 2 is a process explanatory diagram showing the reinforcing bar arrangement process of the above-mentioned non-steel wall balustrade manufacturing method. [Figure 3] FIG. 3 is a process explanatory diagram showing a formwork installation process in the manufacturing method of the non-iron wall balustrade. [Figure 4] FIG. 4 is a process explanatory diagram showing the support installation state in the formwork installation step of the manufacturing method for non-iron wall balustrades according to this embodiment. [Figure 5] FIG. 5 is a process explanatory diagram showing the concrete pouring step in the manufacturing method for the non-iron wall balustrade according to this embodiment. [Figure 6] FIG. 6 is a process explanatory diagram showing the formwork removal step of the manufacturing method for the non-iron wall balustrade according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, one embodiment of a method for manufacturing a non-iron wall balustrade according to the present invention will be described in detail with reference to the drawings.

[0013] A method for manufacturing a non-steel wall balustrade according to an embodiment of the present invention will be described using Figures 1 to 6. In this embodiment, a case will be described in which a non-steel wall balustrade 1 in which RC carbon fiber reinforcement is arranged as non-steel reinforcement is manufactured by pouring cast-in-place concrete on a precast PC deck 10 in which carbon fiber composite cables, which are non-corrosive materials, are arranged as tendons in two directions, perpendicular to the bridge axis and in the bridge axis direction.

[0014] (1. Floor slab installation process) Figure 1 is a process explanatory diagram showing the slab installation process of the non-iron wall balustrade manufacturing method according to this embodiment. As shown in Figure 1, in the non-iron wall balustrade manufacturing method according to this embodiment, first, a slab installation process is carried out in which a precast PC slab 10 is installed in a predetermined position.

[0015] The precast PC deck slab 10 is an MeL slab (registered trademark) made of non-ferrous material without using steel bars as reinforcement, and is equipped with carbon fiber composite cables 11 arranged perpendicular to the bridge axis and carbon fiber composite cables 12 arranged in the bridge axis direction.

[0016] (2. Reinforcement process) Fig. 2 is a process explanatory diagram showing the reinforcing bar arrangement process of the manufacturing method of the non-steel wall balustrade according to this embodiment. Next, as shown in Fig. 2, in the manufacturing method of the non-steel wall balustrade according to this embodiment, a reinforcing bar arrangement process is carried out in which reinforcing bars are added to the loop bars 10b protruding from the ground covering portion 10a of the installed precast PC deck 10.

[0017] For the non-steel wall balustrade 1, non-steel reinforcement bars 2 for RC are used as internal reinforcement bars, with each strand of a carbon fiber composite cable made from a composite of resin and resin fiber covered with PET fiber to create an uneven surface. Although details will be omitted, this uneven carbon fiber reinforcement bar for RC has been compared in anchorage performance with J-shaped and L-shaped hooks of general rebars of each nominal diameter made of SD345, in accordance with the "Guidelines for Reinforcement Anchorages and Joints [2020 Edition] Japan Society of Civil Engineers," and it has been confirmed that it is at the same level or better than general rebars.

[0018] Therefore, in this process, as shown in FIG. 2, non-steel reinforcing bars 2 are arranged in the same manner as in the conventional arrangement of steel bars according to the structural calculations of the wall parapet.

[0019] (3. Formwork installation process) Fig. 3 is a process explanatory diagram showing the formwork installation step of the manufacturing method for non-steel wall balustrades according to this embodiment. Next, as shown in Fig. 3, in the manufacturing method for non-steel wall balustrades according to this embodiment, a formwork installation step is carried out in which formwork 3 is installed on both sides of the non-steel reinforcing bars 2 arranged in the previous step, with a predetermined overlapping distance.

[0020] The formwork 3 is assembled from standard waterproof lauan plywood and battens used for concrete formwork, and is supported and fixed by single pipes 4 and separators 5. The separators 5 connecting the formwork 3 of the non-steel wall balustrade are standard B-type separators for double-sided exposed concrete, with ceramic P-con 51 attached to threaded sections formed on both ends of the separator body 50 made of steel rod. Of course, the P-con 51 can also be standard plastic P-con. Form ties 52 are attached to the P-con 51, and the separators 5 are fixed to the single pipes 4 with the form ties 52, thereby defining and maintaining the spacing between the formwork 3.

[0021] In this process, as shown in Fig. 3, separator body 50 is inserted into non-ferrous cylindrical body 53 made of a rust-resistant material and mounted between P concrete columns 51, 51. Therefore, after the concrete hardens, separator body 50 made of steel rods of separator 5 can be pulled out and removed together with formwork 3 from non-ferrous cylindrical body 53. Although the illustrated non-ferrous cylindrical body 53 is an example of a continuous, integrated cylindrical body, it may be separated to make it easier to remove later.

[0022] 4 is a process explanatory diagram showing the support installation status in the formwork installation process of the manufacturing method for non-steel wall balustrades according to this embodiment. As shown in Fig. 4, in this process, supports 6 are fastened and fixed by counterweights 7 placed on the precast PC deck 10 as shoring to support the formwork 3 during concrete pouring. In the illustrated embodiment, a temporary protective fence is used as the counterweight 7, but of course any heavy object can be used.

[0023] Furthermore, single pipes 4 and the like are installed horizontally along the counterweight 7, and the supports 6 are fixed to the single pipes 4 with wire, clamps, or special jigs, etc., so that they can withstand forces acting in the direction of tilting the formwork 3 outward and forces acting in the direction of tilting it inward. In addition, facing wood 8 is attached to the top edge of the concrete to be poured in the next process to prevent markers and corners from being chipped.

[0024] (4. Concrete pouring process) Fig. 5 is a process explanatory diagram showing the concrete pouring step in the manufacturing method for non-steel wall balustrades according to this embodiment. Next, as shown in Fig. 5, in the manufacturing method for non-steel wall balustrades according to this embodiment, a concrete pouring step is carried out in which fresh concrete 9 is poured into the formwork 3 installed in the formwork installation step.

[0025] (5. Formwork removal process) 6 is a process explanatory diagram showing the formwork demolding step in the manufacturing method for non-steel wall balustrades according to this embodiment. Next, in the manufacturing method for non-steel wall balustrades according to this embodiment, after a predetermined curing period has passed and the concrete poured in the concrete pouring step has reached a predetermined strength, a formwork demolding step is carried out in which the formwork installed in the formwork installation step is demolded and dismantled and removed.

[0026] In this process, the separator body 50 of the separator 5 is pulled out and removed from the non-steel cylindrical body 53 together with the formwork 3. When this process is completed, the method for manufacturing a non-steel railing according to an embodiment of the present invention is complete, and the non-steel railing 1 is completed. As a result, even if an inexpensive, general-purpose separator is used for the separator 5 connecting the formwork 3, it is possible to manufacture a non-steel railing 1 that is free from the risk of corrosion, because the separator body 50, which is a steel rod, is removed.

[0027] According to the manufacturing method for the non-steel wall balustrade of this embodiment described above, the separator body 50 of the separator 5 is pulled out and removed from the non-steel cylindrical body 53 along with the formwork 3. Therefore, even if an inexpensive, general-purpose separator is used for the separator 5 connecting the formwork 3, since the separator body 50, which is a steel rod, is removed, a non-steel wall balustrade 1 that is not susceptible to corrosion can be manufactured.

[0028] Furthermore, according to the manufacturing method for non-steel wall balustrades of this embodiment, supports 6, which act as shoring to support formwork 3 during concrete pouring, are fastened by counterweights 7 placed on precast PC deck slab 10, eliminating the need to drill holes in precast PC deck slab 10 or embed metal inserts in advance, and eliminating cross-sectional defects. Furthermore, according to the manufacturing method for non-steel wall balustrades of this embodiment, metal fittings that may rust are not required for precast PC deck slab 10, improving the durability of not only non-steel wall balustrades 1 but also precast PC deck slab 10.

[0029] Although the manufacturing method of the non-iron wall balustrade according to the embodiment of the present invention has been described in detail above, the above-mentioned and illustrated embodiments are merely specific examples for carrying out the present invention, and therefore the technical scope of the present invention should not be interpreted as being limited by them. [Explanation of symbols]

[0030] 1: Non-iron wall railing 2: Non-ferrous reinforcement 3: Formwork 4: Single pipe 5: Separator 50: Separator body (steel bar) 51: P-Con 52: Form tie 53: Non-ferrous cylindrical body 6: Support 7: Counterweight 8: Menki 9: Fresh concrete 10: Precast PC deck 10a: Ground covering part 10b: Loop muscle 11,12: Carbon fiber composite cable

Claims

1. A method for manufacturing a non-iron wall balustrade that does not use a rust-causing material for the internal reinforcement of concrete, by on-site construction. Pour concrete into a separator having a steel rod connecting the formwork of the non-steel wall balustrade with a non-steel cylindrical body made of a rust-resistant material inserted through it, and after the concrete has hardened, pull out and remove the steel rod of the separator together with the formwork from the non-steel cylindrical body. A manufacturing method for non-iron wall balustrades characterized by the above.

2. When pouring concrete, the supports that support the formwork are fastened and fixed with counterweights placed on the deck.

2. The method for manufacturing a non-iron wall balustrade according to claim 1 .

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