Manufacturing method of lattice products

Abstract

To provide an optimal, reliable and efficient manufacturing method for manufacturing a lattice-like product by eliminating the need for a pressure-welding machine and a large-scale related device, suppressing energy consumption of a power use amount during manufacturing, and fixing a plurality of pipe-like connecting members perpendicular to a main member in a crossing manner.SOLUTION: A method for manufacturing a lattice-like product in which a plurality of thin plate-like main members with a constant thickness (t) are juxtaposed at a fixed intervals by connecting members includes the steps of: through-hole formation of the main members; holding of the main members to a fixed comb member and a movable comb member; alignment of the main members; holding of the main members; installation of the connecting members in a penetrating manner; (A) fixation by pressing down of the connecting members by the movable comb member; (B) table surface movement of a main member group; repetition of the steps (A) and (B) by the number (n) of connecting members; formation of an outer frame part of a lattice body; and hot-dip galvanizing.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a manufacturing method for obtaining a lattice-shaped product by fixing a plurality of main members arranged in parallel at regular intervals to each other in a crosswise manner using a plurality of pipe-shaped connecting members that are perpendicular to the main members. [Background technology]

[0002] For example, metal lattice products (gratings) are often used for scaffolding in factories and plants, roads, and sidewalks, with the top surfaces of multiple parallel, regularly spaced main members fixed in a lattice pattern by fixing members (twist bars). As shown in Figure 15, this type of grating 100 is most commonly manufactured by arranging multiple twist bars 130 perpendicular to multiple main members 120 arranged at regular intervals, and then welding the twist bars 130 from the top surfaces of the main members 120 by electric pressure welding such as projection welding (see, for example, Figure 3 of Patent Document 1). Reference numeral 111 denotes an outer frame member.

[0003] However, because electric pressure welding involves passing a large current through the weld, generating resistance heat at the weld and applying pressure to perform the welding, the equipment tends to be large and the amount of electricity used during manufacturing increases. Furthermore, when the fixing members are welded using projection welding, the fixing members, especially the welded portions, protrude from the top surface of the grating, which can lead to problems such as poor appearance (unclear) or slippery tripping. Furthermore, the strength of the lower part of the main member, i.e., the back side of the grating, can be reduced. Furthermore, the welding machines and related equipment are large, which leads to problems such as energy consumption, setup changes, and the factory environment due to noise and flying debris. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-60738 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above points and provides a manufacturing method for a lattice product that does not require a pressure welding machine or large-scale related equipment, solves or suppresses problems such as energy consumption during manufacturing, setup changes, and other problems in the factory environment due to noise and flying debris, and improves the appearance of the product. In particular, the present invention provides an optimal, reliable, and efficient manufacturing method for manufacturing a lattice product by fixing multiple pipe-like connecting members perpendicular to a main member in a crosswise manner. [Means for solving the problem]

[0006] That is, the invention of claim 1 is a method for manufacturing a lattice-shaped product in which a plurality of thin plate-shaped main members having a constant thickness t are arranged side by side at a constant interval s by connecting members, forming through holes in side surfaces of the plurality of main members; a fixed comb member and a movable comb member, each of which protrudes or sinks into a table surface on which the main member is placed, and each of which has holding grooves of a thickness t of the main member formed in a comb-teeth shape at the constant intervals s, the movable comb member being arranged in parallel with the fixed comb member and being capable of advancing and retreating toward the fixed comb member, and a step of holding the main member perpendicularly in both of the holding grooves of the fixed comb member and the movable comb member protruding from the table surface; a step of aligning the group of main members placed on the table surface by end surface aligning members having abutment portions for contacting end surfaces of the main members held perpendicularly in both the holding grooves of the fixed comb member and the movable comb member; a step of holding an upper portion of the group of main members placed on the table surface by an upper holding member having a plurality of holding grooves formed at the same intervals as the interval s; a step of inserting a pipe-shaped connecting member through the through hole of each main member of the group of main members that are aligned and held; (A) a step of moving the movable comb member toward a fixed comb member with respect to one of the connecting members of the group of aligned and held main members, compressing and crushing the connecting member to form a major diameter deformed portion larger than the diameter of the through hole of each of the main members, and fixing the connecting member to the through hole of the main member via the major diameter deformed portion; (B) a step of temporarily sinking the fixed comb member and the movable comb member from the table surface, moving the main member group, and then protruding the fixed comb member and the movable comb member from the table surface again to hold other connecting members perpendicularly in both holding grooves of the movable comb member and the fixed comb member; A step of repeating the above steps (A) and (B) for the number n of connecting members; After completing the repeating steps, forming an outer frame portion on the outer periphery of the lattice body; A step of hot-dip galvanizing the grid body provided with the outer frame to obtain a grid-shaped product. The present invention relates to a method for producing a lattice product, characterized by comprising the steps of:

[0007] The invention of claim 2 relates to a method for manufacturing a lattice-shaped product in claim 1, in which the end surface alignment member and upper holding member are composed of a single alignment member having a main member end surface abutment portion and a main member upper holding groove portion.

[0008] The invention of claim 3 relates to a method for manufacturing a lattice-shaped product in claim 1, wherein the diameter of the through hole of the main member is 8 to 10 mm, and the compressed, crushed long diameter deformed portion of the pipe-shaped connecting member is formed 1 to 4 mm larger than the diameter of the through hole. [Effects of the Invention]

[0009] As described above, the grating processing device according to the invention of claim 1 is a method for manufacturing a grid-like product in which a plurality of thin plate-like main members having a constant thickness t are arranged side by side at a constant interval s using connecting members, the method comprising the steps of: forming through holes in the side surfaces of the plurality of main members; fixed comb members and movable comb members that protrude from or are recessed into a table surface on which the main members are placed, and have holding grooves of the thickness t of the main members formed in a comb-teeth shape at the constant interval s, the movable comb member being arranged in parallel with the fixed comb member and being able to advance and retreat toward the fixed comb member, and holding the main members perpendicular to both the holding grooves of the fixed comb member and the movable comb member that protrude from the table surface; aligning the group of main members placed on the table surface by an end surface aligning member that has abutting portions that contact the end surfaces of the main members held perpendicular to both the holding grooves of the fixed comb member and the movable comb member; and forming the upper parts of the group of main members placed on the table surface at the same interval as the interval s. a step of inserting a pipe-shaped connecting member into the through-hole of each main member of the group of aligned and held main members; (A) a step of moving the movable comb member toward the fixed comb member with respect to one of the connecting members of the group of aligned and held main members and compressing the connecting member to form a long-diameter deformed portion larger than the diameter of the through-hole of each of the main members, and fixing the connecting member to the through-hole of the main member via the long-diameter deformed portion; (B) a step of temporarily sinking the fixed comb member and the movable comb member from the table surface, moving the group of main members, and then protruding the fixed comb member and the movable comb member from the table surface again to hold another connecting member perpendicularly in both the holding grooves of the movable comb member and the fixed comb member; a step of repeating the steps (A) and (B) the number of times equal to n for the number of connecting members; and a step of forming an outer frame portion around the outer periphery of the grid after completing the repeating steps; and a step of hot-dip galvanizing the grid with the outer frame to obtain a grid-shaped product. Since the present invention is characterized by having the above, it has the following effects. (a) First, since there is no need for pressure welding machines or large-scale related equipment, energy consumption during manufacturing is significantly reduced, and problems such as setup changes and other problems in the factory environment caused by noise and flying debris can be solved or suppressed at once. In addition to (i), since a lattice product is manufactured by fixing a plurality of pipe-like connecting members perpendicular to the through holes of the main member in a crossing manner, the connecting members are not exposed on the surface of the product, improving the appearance of the product and preventing slipping and tripping when passing through. In particular, this invention provides an optimal, reliable, and efficient manufacturing method for manufacturing a lattice product by fixing a plurality of pipe-like connecting members perpendicular to the main member in a crossing manner.

[0010] (iii) Furthermore, according to this invention, there are provided a fixed comb member and a movable comb member that protrude from or are recessed into a table surface on which the main members are placed, and that have holding grooves of the main members having a thickness t and formed in a comb-teeth shape at the constant interval s, the movable comb member being arranged in parallel with the fixed comb member so as to be able to move toward and away from the fixed comb member, and the main members are held perpendicularly in both the holding grooves of the fixed comb member and the movable comb member that protrude from the table surface, the main member group placed on the table surface is aligned by an end surface alignment member that has abutting portions that contact the end faces of the main members held perpendicularly in both the holding grooves of the fixed comb member and the movable comb member, and the upper part of the main member group placed on the table surface is held by an upper holding member that has a plurality of holding grooves formed at the same interval as the interval s. This makes it possible to efficiently and reliably align and arrange a plurality of main members in a predetermined main member group. (d) Then, the pipe-shaped connecting members can be reliably and quickly inserted through the through holes of each of the main members of the group of main members that have been aligned and held by the above (c). (e) At the same time, the process of compressing and crushing the portions between the main members through which the pipe-shaped connecting members of the main member group are inserted by moving the fixed comb member toward the movable comb member can be carried out reliably and efficiently. In particular, the movement of the main members due to the compression and crushing of the connecting members caused by the movement of the movable comb member can be suppressed by holding the alignment grooves of the upper alignment member, making it possible to obtain an accurate lattice-shaped product. (a) After one connecting member is fixed by compressing and crushing, the fixed comb member and the movable comb member are temporarily buried in the table surface, and then the main member group on the table surface is moved to fix another connecting member, and it protrudes again and is fixed by compressing and crushing. This is repeated for the number n of connecting members, so there is no need for necessary setup changes, which improves work efficiency and is cost-effective.

[0011] The invention of claim 2 is the same as claim 1, in that the end surface alignment member and upper holding member are composed of a single alignment member having a main member end surface abutment portion and a main member upper holding groove portion, thereby providing good work efficiency and cost advantages.

[0012] In the invention of claim 3, the diameter of the through hole of the main member is 8 to 10 mm, and the compressed, crushed long diameter deformed portion of the pipe-shaped connecting member is formed to be 1 to 4 mm larger than the diameter of the through hole, so that this type of lattice-shaped product can be manufactured reliably and efficiently. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a process diagram of a manufacturing method according to an embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view of a grating showing an example of a grid-like product. [Figure 3] FIG. 3 is a longitudinal cross-sectional view of a main part of the grating of FIG. 2. [Figure 4] FIG. 3 is a comparative explanatory diagram of a connecting member that penetrates the main member of the grating in FIG. 2. [Figure 5] 1 is a perspective view of a main part of a processing device used in the present invention. [Figure 6] FIG. 10 is a partial perspective view showing the alignment and holding state of the main members by the alignment member of the present invention. [Figure 7] 1 is a schematic top view showing a state in which a main member and a connecting member are placed on a processing device according to a method of the present invention. [Figure 8] FIG. 10 is a schematic top view showing the process of crushing the connecting member. [Figure 9] FIG. 10 is a schematic top view showing the completed state of the crushing process of the connecting member. [Figure 10] 1 is a schematic explanatory view showing a state in which a main member is placed on a fixed comb member and a movable comb member in a protruding state of the processing device of the present invention; [Figure 11] FIG. 10 is a schematic explanatory view showing a state in which the main member is placed with the connecting member inserted through the fixed comb member and the movable comb member in the protruding state. [Figure 12] 10 is a schematic explanatory view showing a process of crushing the connecting member by the fixed comb member and the movable comb member in the protruding state. FIG. [Figure 13] FIG. 10 is a schematic explanatory view showing the completed state of the crushing step of the connecting member of the present invention. [Figure 14] FIG. 10 is a schematic explanatory view showing the immersion state of the fixed comb members and the movable comb members after the connecting member has been crushed. [Figure 15] FIG. 10 is a vertical cross-sectional view of the vicinity of a connecting member of a conventional grating. DETAILED DESCRIPTION OF THE INVENTION

[0014] As shown in Figures 2 to 4, the present invention is a method for manufacturing a lattice-shaped product, such as a grating 50, in which multiple thin plate-like main members 60 of a certain thickness t are juxtaposed at a certain interval s by connecting members 70, and comprises the steps shown in Figure 1. The corresponding steps are shown below along with their corresponding drawing numbers. (A) Process for forming through holes in the main component (A) The process of holding the main member to the fixed comb member and the movable comb member (Figures 5, 6, 7, 10, and 11) (c) Main component alignment process (Figures 6 and 7) (d) Main component holding process (Figures 8, 12, 13, and 14) (E) Installation process of connecting members (Figures 7 and 10) (F) (A) Fixing process by crushing the connecting member with the movable comb member (Fig. 8, Fig. 12, Fig. 13) (G) (B) Main member group table surface movement process (Fig. 9, Fig. 14) (h) A process of repeating the above steps (A) and (B) for the number n of connecting members. (i) Formation process of the outer frame of the grid (J) Hot-dip galvanizing process (K) A method for manufacturing a lattice-shaped product comprising (A) to (K) above

[0015] 2 to 4, reference numeral 51 denotes the outer frame of the grating 50, and reference numeral 61 denotes the main member 60, which has upper and lower bulges 62 and 63 and a cross section shaped like the letter "I," 64 denotes a non-slip uneven portion formed on the upper surface of the main member, and 65 denotes a through-hole in the main member. Furthermore, reference numeral 71 denotes the insertion portion of the main member through-hole 65, 72 denotes a portion other than the insertion portion, 73 denotes a hollow portion of the pipe, 75 denotes a compressed and deformed portion, 76 and 77 denote the elliptical major axis portions at both ends of the compressed and deformed portion 75, and 80 denotes a portion fixed to the main member through-hole 65.

[0016] 5 to 14 show a processing apparatus 10 according to an embodiment of the present invention, and the embodiment of the present invention will be described below. (A) Process for forming through holes in the main component The present invention relates to a method for manufacturing a lattice product such as an iron grating 50 in which a plurality of thin plate-like main members 60 of a certain thickness t are arranged side by side at a certain interval s using connecting members, particularly pipe-like connecting members 70 having hollow portions 73, as shown in the figure, and through holes 65 are formed in the sides of the plurality of main members 60.

[0017] The main member 60 is made of a thin iron plate with a cross section shaped like the letter "I" (eye) or flat, with bulges 62 and 63 at the top and bottom, and a through hole 65 larger than the outer diameter of the pipe-shaped connecting member 70 is drilled in its side by a known method. The through hole 65 in the main member 60 is configured to allow the connecting member 70 to pass through, and is formed approximately 1 mm larger than the outer diameter of the connecting member 70 from the perspective of workability during manufacturing. If the size formed larger than the outer diameter of the connecting member 70 is less than 1 mm, it will be difficult to insert the connecting member 70, and workability will be reduced. If it is larger than 1 mm, the amount of deformation of the connecting member 70, which will be described later, will need to be increased, making it difficult to fix and there is a risk of the appearance being deteriorated.

[0018] The main member 60 shown in the figure has an I-shaped cross section 61 with upper and lower swollen portions 62, 63, and the through-hole 65 is drilled so that part of it overlaps the upper swollen portion 62. This increases the thickness of the main member 60 at the swollen portions 62, 63, thereby improving strength. Note that, in drilling work, the through-hole 65 may be drilled so that it does not overlap the swollen portions 62, 63. The spacing s between the main members 60 in the lattice product is designed as appropriate from the standpoint of the function and strength of the grating 50, but in the embodiment, it is a fine mesh type of 8 to 10 mm. If the spacing s is smaller than 8 mm, the number of main members 60 increases, which is economically disadvantageous, and if the spacing s is larger than 10 mm, stones and the like may fall through the gaps s, or wheels of bicycles, strollers, etc. may fall in.

[0019] As can be seen from the comparative explanatory views of the left and right sides of Figures 3 and 4, the connecting member 70 is inserted into the through hole 65 and then fixed to the through hole 65 of the main member 60 by a compressively deformed portion 75 formed by compressing and deforming a portion 72 other than the through-hole insertion portion 71 from both radial sides. Reference numeral 80 denotes a fixing portion. This connecting member 70 has a cylindrical shape with a hollow portion 73, so that compressive deformation can be easily performed. The compressively deformed portion 75 is formed into a substantially elliptical cross section by being compressed from both radial sides, and both end portions 76, 77 of its major axis constitute a through-hole fixing portion 80 that is fixed by being pressed against the inner periphery of the through hole 65 of the main member 60.

[0020] The connecting member 70 is fixed by being inserted into the through-hole 65 on the side surface of the main member 60, eliminating the need for an exposed portion on the upper side of the main member 60 as in the past, improving the appearance. Furthermore, because the fixing is achieved by compressive deformation, there is no need to pass a large current through projection welding as in the past, and power consumption during manufacturing can be significantly reduced. Furthermore, when a portion of the through-hole 65 is drilled so as to overlap the upper swelling portion 62, the upper portion of the through-hole fixing portion 80 is fixed over the upper swelling portion 62, thereby increasing the bonding strength between the main member 60 and the connecting member 70. It goes without saying that the through-hole insertion portion 71 also deforms within the through-hole 65 as the compressive deformation portion 75 is formed.

[0021] (a) A process of holding the main member to the fixed comb member and the movable comb member The main member 60 having the through-holes 65 formed therein is held by the fixed comb member 20 and the movable comb member 30 of the processing device 10, as shown in FIGS. The processing device 10 will be described in detail in the explanation of Figures 10 to 14, and is a device for processing gratings 50 consisting of main members 60 arranged in parallel at regular intervals s and having through holes 65 on their sides, and connecting members 70 that are inserted into the through holes 65 perpendicular to the main members 60 and fix them in a grid pattern, and is equipped with a table 11, fixed comb members 20, movable comb members 30, moving means 40, lifting means 45, and alignment members 46. The fixed comb member 20 and the movable comb member 30 have holding grooves 21, 31 of the main member 60, each of which is formed in a comb-teeth shape at the constant interval s and has a thickness t, and as can be seen from the explanatory views of Figures 10 to 14, are configured to protrude or sink into or from the table surface 12 on which the main member 60 is placed by a lifting means 45. The movable comb member 30 is arranged in parallel to the fixed comb member 20 and is configured to be able to advance and retreat toward the fixed comb member 20 by a moving means 40. The main member 60 is held perpendicularly by both holding grooves 21, 31 of the fixed comb member 20 and the movable comb member 30, which protrude from the table surface 12 of the processing device 10, as shown in Figures 5 and 7.

[0022] The table 11 of the processing device 10 has a mounting surface 12 on which a plurality of main members 60 are placed. In this table 11, a groove space V is formed on the mounting surface 12, in which the fixed comb member 20 and the movable comb member 30 can move up and down. The shape of the groove space V is not particularly limited, and may be a notch, a hole, or the like as appropriate.

[0023] The fixed comb member 20 protrudes from or is recessed into the support surface 12 of the table 11, and has a plurality of retaining grooves 21 formed at intervals equal to the spacing s between the main members 60. The retaining grooves 21 are used to hold the main members 60 during the manufacture of the grating 50, and the number of retaining grooves 21 is at least equal to the number of main members 60 of the grating 50 to be manufactured. Similarly, the movable comb member 30 protrudes from or is recessed into the support surface 12 of the table 11, and has a plurality of retaining grooves 31 formed at intervals equal to the spacing s between the main members 60. The movable comb member 30 is arranged in parallel with the fixed comb member 20 and is configured to be able to advance and retreat toward the fixed comb member 20. The retaining grooves 31 are used to hold the main members 60 together with the retaining grooves 21 of the fixed comb member 20 during the manufacture of the grating 50, and the number of retaining grooves 31 is at least equal to the number of main members 60 of the grating 50 to be manufactured.

[0024] 8 and 9 and the explanatory views of Figures 10 to 14, the moving means 40 moves the movable comb member 30 forward and backward, and moves the movable comb member 30 toward the fixed comb member 20, thereby compressing and deforming the connecting member 70, which is inserted into the through-holes 65 of the main member 60 aligned with the holding grooves 21, 31 of the fixed comb member 20 and the movable comb member 30 and is positioned between the fixed comb member 20 and the movable comb member 30, from both radial sides, to form a compressive deformation portion 75 that fixes the connecting member 70 to the through-hole 65 of the main member 60. The moving means 40 moves the movable comb member 30 forward and backward and is composed of an appropriate device such as a known cylinder device that can compress and deform the connecting member 30 with a predetermined pressure.

[0025] The lifting means 45 lifts and lowers the fixed comb member 20 and the movable comb member 30 together. The lifting means 45 of the embodiment lifts and lowers the fixed comb member 20 and the movable comb member 30 to a processing position where they can protrude above the table 11 and hold the main member 60, and after processing (or when not processing), they sink the fixed comb member 20 and the movable comb member 30 below the table 11 and lower them to a position where they can move and hold the main member 60. The lifting means 45 is made up of an appropriate device such as a known cylinder device that can lift and lower the fixed comb member 20 and the movable comb member 30.

[0026] (c) Alignment process of main components; As described above, the main members 60 are held perpendicularly in the holding grooves 21, 31 of the fixed comb member 20 and the movable comb member 30 on the table surface 12 of the processing device 10. At this time, as shown in FIG. 6, the group of main members w placed on the table surface is aligned by the end face alignment member 46 (46B) having an abutment portion 47 for contacting the end face of each main member 60.

[0027] (d) Main component holding process; The main component group w placed on the table surface by the end surface alignment member 46 is held at its upper part by an upper holding member 46 (46A) having a plurality of holding grooves 48 formed at the same intervals as the interval s. In the embodiment, as shown in the figure, the upper holding member of the end surface alignment member 46B and the upper holding member 46A are configured as a single alignment member 46. This provides good work efficiency and is also advantageous in terms of cost.

[0028] (E) Installation process of connecting members; A pipe-shaped connecting member 70 is inserted through each of the corresponding through-holes 65 of each of the aligned and held main members 60 of the group of main members w. As described above, the alignment member 46 holds the main members 60 of the group of main members w in an orderly and accurate alignment, so that the pipe-shaped connecting members 70 can be inserted through each of the aligned through-holes 65 quickly, efficiently and reliably.

[0029] (F) (A) Fixing process by crushing the connecting member with the movable comb member 7, 11, and 12, the movable comb member 30 moves toward the fixed comb member 20 with respect to one connecting member 70 of the aligned and held main member group w, compressing and crushing the connecting member 70 to form major diameter deformed portions 76, 77 (see FIG. 3) that are larger than the diameter of the through hole 65 of the main member 60. As can be understood from the comparison with FIG. 4, the portion 72 of the connecting member 70 other than the insertion portion 71 of the main member through hole 65 is compressed and crushed to deform into an elliptical shape, and the connecting member 70 is fixed to the through hole 65 of the main member 60 via the major diameter deformed portions 76, 77. Reference numeral 80 in FIGS. 3 and 4 denotes a fixing portion. Here, in this fixing process by crushing, if the alignment grooves 48 of the alignment members 46 are arranged in the main member group w near the movable comb member 30 as shown in Figures 8 and 12, fluctuations (shifts, wobble) or deformations of the main members 60 due to the pressure force during crushing can be suppressed, and an accurate and beautiful lattice body can be produced.

[0030] (G) (B) Table surface moving process of main component group After the pressing step is completed and one connecting member 70 of the main member group w is fixed, the movable comb member 30 retracts as shown in Figures 9 and 13, and then, as shown in Figure 13, the fixed comb member 20 and the movable comb member 30 are temporarily recessed from the table surface 12. In this state, the main member group w is moved, and the fixed comb member 20 and the movable comb member 30 again protrude from the table surface 12 in order to process another connecting member 70. Then, as described above, the other connecting member 70 is held perpendicularly in both the holding grooves 31, 21 of the movable comb member 30 and the fixed comb member 20.

[0031] (h) A process of repeating the above steps (A) and (B) for the number n of connecting members. Thereafter, the steps (A) and (B) are repeated the number of times equal to n, which is the number of connecting members.

[0032] (i) Formation process of the outer frame of the grid After the repetitive process is completed and a grid body consisting of a group of main members w to which a plurality of connecting members 70 are fixed is formed, a necessary outer frame portion is formed around the periphery of the grid body.

[0033] (J) Hot dip galvanizing process, The grid body with the outer frame is then hot-dip galvanized to obtain a grid-shaped product called a grating. The galvanized layer is formed by a known hot-dip galvanizing process. Forming the galvanized layer improves the corrosion resistance of the grating 50 and also allows the main members 60 (through holes 65) of the through-hole fixing portions 80 to be joined and more firmly fixed to the connecting members 70 (compression-deformed portions 75). Furthermore, during the hot-dip galvanizing process, the grid body 50 is heated and strengthened, thereby improving its strength. [Explanation of symbols]

[0034] 10 Processing equipment 12 Table Surface 20 Fixed comb member 21 Retaining groove 30 Movable comb member 31 Retaining groove 40 Transportation 45 Lifting means 46 Alignment member 47 End face alignment section 48 Upper holding part 50 Grating 51 Outer frame 60 Main member 65 through holes 70 Pipe-shaped connecting member 71 Through-hole insertion part 75 Compression deformation part 80 Through hole fixing part t Main member thickness s Regular spacing (between main members) w Main member group v Groove space

Claims

1. A method for manufacturing a lattice-shaped product in which a plurality of thin plate-shaped main members having a constant thickness (t) are arranged side by side at a constant interval (s) using connecting members, forming through holes in side surfaces of the plurality of main members; a fixed comb member and a movable comb member, each of which protrudes or sinks into a table surface on which the main member is placed, and which have holding grooves formed in a comb-teeth shape at the fixed intervals (s) and having a thickness (t) of the main member, the movable comb member being arranged in parallel with the fixed comb member and being able to move toward and away from the fixed comb member, and a step of holding the main member perpendicularly in both the holding grooves of the fixed comb member and the movable comb member, which are protruding from the table surface; a step of aligning the group of main members placed on the table surface by end surface aligning members having abutment portions for contacting end surfaces of the main members held perpendicularly in both the holding grooves of the fixed comb member and the movable comb member; a step of holding the upper part of the group of main members placed on the table surface by an upper holding member having a plurality of holding grooves formed at the same intervals as the interval (s); a step of inserting a pipe-shaped connecting member through the through hole of each main member of the group of main members that are aligned and held; (A) a step of moving the movable comb member toward a fixed comb member with respect to one of the connecting members of the group of aligned and held main members, compressing and crushing the connecting member to form a major diameter deformed portion larger than the diameter of the through hole of each of the main members, and fixing the connecting member to the through hole of the main member via the major diameter deformed portion; (B) a step of temporarily sinking the fixed comb member and the movable comb member from the table surface, moving the main member group, and then protruding the fixed comb member and the movable comb member from the table surface again to hold other connecting members perpendicularly in both holding grooves of the movable comb member and the fixed comb member; A step of repeating the above steps (A) and (B) for the number (n) of connecting members; After completing the repeating steps, forming an outer frame portion on the outer periphery of the lattice body; A step of hot-dip galvanizing the grid body provided with the outer frame to obtain a grid-shaped product. A method for producing a lattice product, comprising:

2. 2. The method for manufacturing a grid-like product according to claim 1, wherein the end surface aligning member and the upper holding member are constituted by a single aligning member having a main member end surface abutment portion and a main member upper holding groove portion.

3. The method for manufacturing a lattice product according to claim 1, wherein the diameter of the through hole of the main member is 8 to 10 mm, and the compressed and crushed long diameter deformed portion of the pipe-shaped connecting member is formed 1 to 4 mm larger than the diameter of the through hole.

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