Support column corrosion prevention cover

Abstract

This invention provides a corrosion prevention cover for metal support posts that can be easily installed near the base of the post to provide corrosion prevention, increase the post's erection strength, and extend its lifespan. [Solution] A column corrosion prevention cover 1 for a metal column 100 that is installed partially embedded in concrete 110, comprising: a cylindrical portion 10 into which the column is inserted when the column is installed; an upper V-cut portion 12 provided on the inner circumference side of the upper part of the cylindrical portion into which the column is inserted for filling with sealant; a flange portion 20 provided near the embedded portion of the cylindrical portion that is embedded in concrete when installed; a lip provided on the back surface of the flange portion that faces the concrete when installed; and a rib 30 provided on the back surface of the flange portion with a gap between it and the lip, which is embedded in concrete when installed.

Description

[Technical Field]

[0001] The present invention relates to a corrosion prevention structure for the GL (root) portion of a metal support pillar. The corrosion-protected object (support pillar) is mainly used as a component of road signs, road protection fences, road mirrors, signboards, playground equipment, fences, carports and the like. [Background Art]

[0002] For metal support pillars, environmental conditions such as moisture adhesion to the surface of the metal structure and high humidity change irregularly in the area near the portion embedded and fixed in concrete. To prevent corrosion at such locations, corrosion prevention treatment is performed by painting, coating methods or the like.

[0003] Conventional techniques related to the present invention include, for example, those using an electrolytic protection method employing an anode material as described in Patent Document 1, and those in which portions prone to corrosion such as the vicinity of an embedded portion are formed of a material with high corrosion resistance as described in Patent Document 2.

[0004] Further, Patent Document 3, Patent Document 4, and Patent Document 5 disclose a method of covering portions prone to corrosion such as the vicinity of an embedded portion with a waterproof material. [Prior Art Documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Unexamined Patent Publication No. 2002-60983 [Patent Document 2] Japanese Unexamined Patent Publication No. 2009-127353 [Patent Document 3] Japanese Unexamined Patent Publication No. 2010-180644 [Patent Document 4] Japanese Unexamined Patent Publication No. 10-212794 [Patent Document 5] Japanese Unexamined Patent Publication No. 2011-99221 [Non-Patent Documents]

[0006] [Non-Patent Document 1] http: / / www.sofutemu.co.jp / poll.html [Overview of the project] [Problems that the invention aims to solve]

[0007] The conventional configuration described above had problems such as the inability to obtain corrosion protection due to damage from humidity changes, wind and rain, vibration stress, dog urine, and human-induced external impacts, thus shortening the lifespan of the metal structure. Accidents caused by such deterioration are occurring nationwide, and are having a significant impact on the safety of daily life.

[0008] In the structure of the aforementioned Patent Document 1, although corrosion of the protected object can be solved by the cathodic protection method, direct bonding to the protected object is necessary for electrical connection, which presented challenges in terms of pretreatment such as paint film removal and the reliability of the bonding.

[0009] In the structure described in Patent Document 2, welding of dissimilar materials requires welding equipment and welders in addition to conventional labor, which increases the number of processes and thus the cost.

[0010] The construction method described in Patent Document 3, which supports the pillars with concrete legs, is a method that adds a sheet around the boundary in addition to the conventional root wrapping method, but there is a risk that the sheet may be damaged by impact. Also, it is dangerous if someone comes into contact with the overhanging part without noticing it. In particular, in areas with heavy snowfall in winter, the danger increases as it becomes hidden by the snow and can also hinder snow removal.

[0011] The waterproof structure for the base of a column described in Patent Document 4 is a construction method for balconies and verandas of buildings, and the conditions of the installation site and the method of holding the column differ from those of signs, etc.

[0012] Patent Document 5 describes a method of waterproofing a column by wrapping a waterproof sleeve around it and then wrapping it with elastic (flexible) rubber to prevent moisture from entering from the upper end of the sleeve. However, elasticity (flexibility) and weather resistance are generally conflicting elements, and deterioration due to direct exposure to ultraviolet rays, temperature fluctuations, and moisture is unavoidable, so the method assumes that the wrapped rubber parts will need to be replaced.

[0013] Therefore, this invention provides a column corrosion prevention cover that can easily provide corrosion prevention effects by simply installing it near the concrete embedding of a metal column without requiring any special work, thereby increasing the erection strength of the column and extending its lifespan. [Means for solving the problem]

[0014] The most important feature of this invention is that, compared to conventional construction methods, it improves the waterproofing and uprightness of metal support posts and provides inexpensive corrosion prevention by simply covering the base of the metal support post with a corrosion prevention cover, which takes only a short time and is easy to do.

[0015] (Structure of the support column corrosion prevention cover) The column corrosion prevention cover according to the present invention is a column corrosion prevention cover for a metal column that is installed with a portion embedded in concrete, In the installed state with the support column in place, the structure has a cylindrical section into which the support column is inserted, an upper V-cut section provided on the inner circumference of the upper part of the cylindrical section into which the support column is inserted for filling with sealant, and a flange section provided near the embedded portion of the cylindrical section that is embedded in concrete in the installed state.

[0016] (Spatial step difference in the cylindrical section) In the column corrosion prevention cover according to the present invention, it is preferable that the cylindrical portion has a caulking reservoir near the flange portion, which is formed by a step on the inner circumference of the cylindrical portion, between the inner circumference of the cylindrical portion and the column.

[0017] (Scratch area) In the support corrosion prevention cover according to the present invention, the flange portion is formed to serve as an upright indicator when installing the support, and to serve as an upright indicator for the support before concrete hardens immediately after installation, and in the installed state, it is preferably provided on the outer peripheral side of the cylindrical portion along the support and at the root portion of the support rising from the concrete surface.

[0018] (barb) In the support corrosion prevention cover according to the present invention, in the installed state, it is preferable that a barb is provided on the back surface of the flange portion that is on the concrete surface side.

[0019] (bite-in space) In the support corrosion prevention cover according to the present invention, the flange portion is provided on the outer peripheral side of the cylindrical portion along the support and at the root portion of the support rising from the concrete surface in the installed state, the barb extends from the outer periphery of the flange portion toward the cylindrical portion on the back surface of the flange portion, and it is preferable that a space for concrete to bite into is formed between the back surface of the flange portion and the barb.

[0020] (rib) In the support corrosion prevention cover according to the present invention, a rib is provided on the back surface of the flange portion with a gap from the barb, and it is preferable that the rib is embedded in concrete in the installed state.

[0021] (hole in rib) The rib may be provided with a hole that is filled with concrete in the installed state.

[0022] (three-direction ribs) In the column corrosion prevention cover according to the present invention, the ribs include a first rib provided on the outer circumference of the cylindrical portion and extending in a first direction along the direction from the outer circumference of the cylindrical portion toward the outer circumference of the flange portion, a second rib provided on the outer circumference of the cylindrical portion and extending in a second direction different from the first direction along the direction from the outer circumference of the cylindrical portion toward the outer circumference of the flange portion, and a third rib provided on the outer circumference of the cylindrical portion and extending in a third direction different from the first and second directions along the direction from the outer circumference of the cylindrical portion toward the outer circumference of the flange portion. [Effects of the Invention]

[0023] By using the column corrosion prevention cover of this invention, corrosion of metal columns can be prevented without requiring special work or personnel.

[0024] The column corrosion prevention cover of this invention is installed near the concrete embedding of a metal column, thereby shielding the column from moisture, humidity, and physical damage to prevent corrosion, and also has the advantage of increasing the standing strength of the column by integrating with the concrete. [Brief explanation of the drawing]

[0025] [Figure 1] A front perspective view of the column corrosion prevention cover according to the present invention. [Figure 2] This diagram illustrates the method of implementing the column corrosion prevention cover according to the present invention, and shows (a) a cross-sectional view of the column corrosion prevention cover in a state of temporary fastening to the upper part of the column, and (b) a cross-sectional view of the column corrosion prevention cover installed at the GL (base) portion of the column. [Figure 3] Figure 2(b) shows a detailed enlarged view of the application of sealant to the column corrosion prevention cover in its installed state. [Figure 4] A front perspective view of another embodiment of the column corrosion prevention cover according to the present invention. [Figure 5] A front perspective view of an embodiment using the support column corrosion prevention cover according to the present invention, wherein (a) a front perspective view of a convex mirror and (b) a front perspective view of a sign. [Figure 6]A front perspective view of an embodiment using the support column corrosion prevention cover according to the present invention, the front perspective view of a sign. [Figure 7] This is an explanatory diagram showing conventional methods for erecting support columns, where (a) represents the conventional erection method, (b) represents the coating method, and (c) represents the root wrapping method. [Modes for carrying out the invention]

[0026] The embodiments and examples of the column corrosion prevention cover according to the present invention will be described below with reference to the drawings. The same reference numerals will be used for the same components throughout the following drawings.

[0027] (Structure of the support column corrosion prevention cover) The column corrosion prevention cover 1 according to the present invention is a column corrosion prevention cover 1 for a metal column 100, which is installed by partially embedding it in concrete 110, as shown in Figure 1. In the installation state immediately after the column 100 is embedded in concrete 110, the column corrosion prevention cover 1, which has been inserted into the column 100 in advance and is in a temporary fixing state, is fixed to the concrete 110 so as to cover the area around the GL (base) portion 102 of the column 100 before the concrete 110 hardens.

[0028] In other words, in the installed state of the support column 100, the support column corrosion prevention cover 1 has a cylindrical section 10 into which the support column 100 is inserted, an upper V-cut section 12 provided on the inner circumference side of the upper part of the cylindrical section 10 for filling with sealant 3, a flange section 20 provided near the embedded portion of the cylindrical section 10 which is embedded in the concrete 110, a lip 22 provided on the back surface of the flange section 20 which faces the surface of the concrete 110, and a rib 30 provided on the back surface of the flange section 20 with a gap between it and the lip 22, which is embedded in the concrete 110 in the installed state.

[0029] (Scratch area) As shown in Figure 2(b) or Figure 3, the flange portion 20 serves as an indicator for upright positioning when installing the support column 100, and can also contribute to maintaining the upright position of the support column 100 before the concrete 110 hardens immediately after installation. Furthermore, in this installed state of the support column 100, it is provided on the outer circumference of the cylindrical portion 10 along the support column 100, and at the GL (base) portion 102 of the support column 100 rising from the surface of the concrete 110.

[0030] (The brim flap) Furthermore, the lip 22 provided on the flange portion 20 preferably extends from the outer circumference of the flange portion 20 toward the cylindrical portion 10 on the back surface of the flange portion 20, and a space is formed between the back surface of the flange portion 20 and the lip 22 in which the concrete 110 bites into. However, the lip 22 may also extend vertically downward from the outer circumference of the flange portion 20, and once the concrete 110 hardens, the lip 22 will be fixed by the concrete 110, and the support column 100 can be stabilized.

[0031] (Rib holes) Furthermore, holes 32 may be provided in the ribs 30 of the column corrosion prevention cover 1, into which concrete 110 is filled when the column 100 is installed (see Figures 2 and 3). When concrete 110 is filled into the holes 32 of the ribs 30 and hardens, it can contribute to the stabilization of the column 100. [Examples]

[0032] (Corrosion prevention cover for support posts in Example 1) Figures 2(a) and 2(b), showing a first example of the present invention, are cross-sectional views illustrating a construction method in which the area around the GL (base) portion 102 of a support column, which is prone to corrosion due to factors such as slight external impacts when using baked paint or corrosion-preventive tape, is covered with a resin component that is harder than those materials.

[0033] (Construction method) When digging a hole in the ground and placing the concrete foundation 110 to install the corrosion-resistant body (support column) 100, the support column corrosion prevention cover 1 is temporarily fixed to the top of the support column 100. When the support column 100 is erected, sealant 3 is applied to the vicinity of the GL (base) portion 102 of the support column 100, and the support column corrosion prevention cover 1 is lowered to the application position so that the back surface of the flange portion 20 of the support column corrosion prevention cover 1 comes into contact with the surface of the concrete 110. A portion of the cylindrical portion 10 below the back surface of the flange portion 20, the flange portion 20, and the rib 30 are embedded in the concrete 110 before it hardens.

[0034] (Upper V-cut section) To prevent rainwater and other elements from entering the support column corrosion prevention cover 1, the sealant 3 is also applied to the upper V-cut portion 12 and allowed to harden. This installation method for the support column corrosion prevention cover 1 according to the present invention is a simple, quick construction method that adds the application of sealant 3 to conventional installation methods, thus reducing costs. The sealant 3 is preferably a silicone-based sealant such as "Cemedine 8060 Pro Silicone Sealant," which has excellent waterproofing, weather resistance, heat resistance, and cold resistance, but the material and type of the sealant 3 are not particularly limited.

[0035] (effect) Conventional corrosion-preventive coatings and covering methods are susceptible to corrosion caused by changes in external humidity, wind and rain, vibration stress, dog urine, and external impacts. The column corrosion prevention cover 1 of this invention can extend the lifespan of the column by covering the vicinity of the GL (base) portion 102 of the column 100.

[0036] One of the causes of the collapse of the support column 100 is that the installation method used for the support column 100 to connect with the concrete 110 allows rainwater and dog urine to easily accumulate, leading to corrosion. In this regard, by installing the support column corrosion prevention cover 1 of the present invention near the concrete embedding of the metal support column 100, the support column 100 can be shielded from rainwater and dog urine, thus preventing corrosion for a longer period than with conventional methods.

[0037] (Reply) The underside of the flange 20 of the support column corrosion prevention cover 1 has a barb 22 that extends from the outer circumference of the flange 20 toward the center. When a space is to be created between the underside of the flange 20 and the barb 22, the surface of the flange 20 is pressed against the upper side of the concrete 110 before it hardens. This causes the concrete 110 near the flange 20 to move due to stress and bite into the space between the underside of the flange 20 and the barb 22. When the concrete 110 hardens, the barb 22 is fixed in place, increasing the installation strength of the support column 100 and preventing it from toppling over.

[0038] (rib) The concrete embedded portion of the support column corrosion prevention cover 1 has ribs 30, and by further providing holes 32, the concrete 110 of the embedded portion and the ribs 30 become integrated, thereby increasing the installation strength. This also increases the resistance to swaying of the support column 100 due to wind, etc., and provides a collapse prevention effect.

[0039] During construction, if only the support column 100 is provided, support is needed to maintain its upright position until the concrete has hardened to a certain extent. However, by providing the flange portion 20 and the three ribs 30 on the concrete-embedded portion, surfaces that press against the concrete 110 can be secured in multiple directions, allowing the support column to maintain its upright position even immediately after construction, before the concrete has hardened.

[0040] (Caulking agent) To prevent rainwater and dog urine from entering, sealant 3 is used. Sealant 3 has excellent waterproofing and airtightness, as well as water and heat resistance, and high weather resistance with minimal expansion and contraction due to temperature changes. It is used in construction in areas with water, such as bathrooms, kitchens, and toilets. It is inexpensive and readily available at home improvement stores, and can be applied using a caulking gun. In addition, once hardened, sealant 3 also acts as an adhesive, so it also serves to fix the corrosion-protected object (support column) 100 to the support column corrosion prevention cover 1.

[0041] (Application of caulking agent) As described above, the installation of the column corrosion prevention cover 1 is carried out by first digging a hole in the ground, pouring in the foundation concrete 110, and installing the column to be protected from corrosion 100. The column corrosion prevention cover 1 is temporarily fixed to the top of the column 10, and when the column is erected, the sealant 3 is applied to the area around the GL (base) portion 102 of the column, and then the column corrosion prevention cover 1 is lowered to the applied portion. When the column corrosion prevention cover 1 is lowered until the back surface of the flange portion 20 contacts the surface of the concrete 110, the sealant 3 accumulates in the space below the step 14 on the inner circumference of the cylindrical portion 10, which is positioned slightly above the GL (base) portion 102 of the column 100, as shown in the enlarged detail view of Figure 3. The sealant 3 is also applied to the upper V-cut portion 12 to prevent rainwater and other liquids from entering the column corrosion prevention cover 1.

[0042] (Caulking agent) Figure 3 is an enlarged longitudinal cross-sectional view of the area near where the sealant 3 was applied. The sealant 3, which was applied near the GL (base) portion 102 of the support column 10 before the temporary fixing of the support column corrosion prevention 1, accumulates in the space below the step 14 of the cylindrical portion 10, and also penetrates into the narrowed portion above the step 14, thereby improving waterproofing and airtightness. By providing the upper V-cut portion 12 on the inner circumference side of the upper part of the cylindrical portion 10, the sealant 3 can be easily applied and accumulate.

[0043] Furthermore, if the sealant 3 flows into the narrowed area below the upper V-cut section 12, the waterproofing and airtightness of the column corrosion prevention cover 1 will be further enhanced. Even if one tries to improve waterproofing and airtightness by eliminating the gap between the outer circumference of the column corrosion prevention cover 1 and the column 10, it is impossible to completely fill the gap, and it is not possible to completely prevent moisture from entering through minute gaps. As shown in Figure 3, if an appropriate space is provided, the sealant 3, which has just been applied, will flow and easily conform to the shape of the gap, thereby improving waterproofing and airtightness. [Examples]

[0044] (Example 2) In Figure 2, the column corrosion prevention cover 1 of the present invention had a circular cross-section that could be inserted into a column 10 with a circular cross-section. In contrast, the column corrosion prevention cover 1 in Figure 4 has a square cross-section that can be inserted into a column 10 with a square cross-section.

[0045] Figures 5 and 6 illustrate examples of the use of the column corrosion prevention cover 1 of this invention, which corresponds to a column 10 with a circular cross-section and a column 10 with a square cross-section, respectively, on various types of columns 10 such as signs, convex mirrors, and billboards, demonstrating how it can prevent corrosion and increase the strength of the column 10.

[0046] In particular, when installing signs like the one shown in Figure 6, conventional construction methods used root wrapping (see Figure 7) to prevent corrosion. However, this method involves two on-site work steps: creating formwork to build concrete above the GL (base) portion 102 of the support column, and then removing it after it hardens. This is time-consuming and often leads to premature corrosion. Using the support column corrosion prevention cover 1 of this invention, a simple, short-term job is required, and it provides long-term protection. Furthermore, conventional root wrapping construction creates a concrete overhang around the GL (base) portion 102 of the support column, but construction using the support column corrosion prevention cover 1 of this invention can minimize this overhang.

[0047] The above description concerns the column corrosion prevention cover according to the present invention, but the present invention is not limited to the above embodiments and examples. Furthermore, the present invention can be implemented in various forms with improvements, modifications, and changes based on the knowledge of those skilled in the art, without departing from its spirit. [Industrial applicability]

[0048] The support column corrosion prevention cover according to this invention can be widely used not only for signs, as shown in Figures 5 and 6, but also for playground equipment, fences, billboards, carports, warehouses, sheds, and other structures that use support columns. [Explanation of Symbols]

[0049] 1: Corrosion prevention cover for support posts 3: Caulking agent 10:Cylinder part 12: Upper V-cut section 14: Step 20: Tsubabu 22: Counterattack 30: Rib 32: Hole 100: Corrosion protected body (post) 102 GL (root) section 110 Concrete

Claims

1. A corrosion-preventing cover for a metal support post, which is installed with part of it embedded in concrete, In the installed state with the support column in place, the cylindrical part into which the support column is inserted, An upper V-cut portion for filling with sealant is provided on the inner circumference side of the upper part of the cylindrical portion into which the support column is inserted, In the aforementioned installation state, a flange portion is provided near the buried portion of the cylindrical portion which is embedded in concrete, A support column corrosion prevention cover.

2. The column corrosion prevention cover according to claim 1, wherein the cylindrical portion has a caulking reservoir near the flange portion, formed by a step formed on the inner circumference of the cylindrical portion, between the inner circumference of the cylindrical portion and the column.

3. The aforementioned flange portion is, It is formed to serve as an indicator for upright positioning when installing the support column, and to serve as an indicator for upright positioning of the support column before the concrete hardens immediately after installation. The column corrosion prevention cover according to claim 1 or 2, provided in the aforementioned installation state on the outer circumference of the cylindrical portion along the column and at the base portion of the column rising from the concrete surface.

4. The column corrosion prevention cover according to claim 1, wherein, in the installed state, a lip is provided on the back surface of the flange portion that faces the concrete surface.

5. The flange portion is provided, in the installed state, on the outer circumference of the cylindrical portion along the support column and at the base of the support column rising from the concrete surface. The aforementioned lip extends from the outer circumference of the flange towards the cylindrical portion on the back surface of the flange, and a space is formed between the back surface of the flange and the lip into which concrete can penetrate, as described in claim 4 of the column corrosion prevention cover.

6. A column corrosion prevention cover according to claim 1, wherein a rib is provided on the back surface of the flange portion, spaced apart from the lip, The aforementioned ribs are support column corrosion prevention covers that are embedded in concrete in the aforementioned installation state.

7. The column corrosion prevention cover according to claim 6, wherein the rib is provided with a hole into which concrete is filled when the column is installed.

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