JP5186315B2 - Anticorrosion lining method for column members - Google Patents

Description

  The present invention relates to an anticorrosion lining method for a column member, and more particularly, to an anticorrosion lining method for a column member that can easily form a anticorrosion lining having a predetermined shape while reducing the work of installing and removing a formwork. .

  In steel pipe piles that support piers and the like, the progress of corrosion is suppressed in the underwater part, which is always flooded, since the supply of oxygen from the outside is blocked. On the other hand, in a tidal zone that repeats a dry state in the air and a submerged state in the sea due to sea surface tidal, corrosion is significantly accelerated. In order to solve such a problem, a method for preventing the corrosion of steel pipe piles by covering the tidal zone and the splash zone located above it with an anticorrosion lining made of concrete, etc., and blocking the supply of oxygen to this range It has been known.

  When building anti-corrosion lining, build a scaffold around the outer periphery of the column member to be constructed, install a metal frame to surround the column member, and then put concrete into the gap between the column member and the frame. Fill with grout material. In such a conventional method, in order to install the mold at a predetermined position, a receiving angle member that supports the lower end of the mold is attached to the surface of the column member by welding or the like. Since the mounting position of the receiving angle member is in the sea, there is a problem that a very complicated mounting work is required. In addition, a large number of molds, which are heavy objects, have to be installed and removed, requiring a great deal of labor.

  As a measure for reducing the work load by reducing the weight of the mold, it has been proposed to use a fiber sheet such as a woven fabric or a non-woven fabric as the mold member (for example, see Patent Document 1). This proposal is applied not to the case where the anticorrosion lining is applied but to the case where the concrete is simply placed, but it is also conceivable to use such a fiber sheet when applying the anticorrosion lining.

However, with a fiber sheet that is less rigid than conventional molds, when the grout material is filled, the weight of the grout material cannot be withstood and bulges occur, forming an anti-corrosion lining with a predetermined shape. The problem that it is not possible arises. Therefore, if the sheet thickness is increased, a reinforcing material is added, or a large number of cylindrical bodies are connected to improve the rigidity as proposed in Patent Document 1, the effect of weight reduction can be obtained. There was a problem of being lost. Further, when the rigidity of the fiber sheet is simply improved, the handleability is lowered, and the filling operation is difficult because the fiber sheet is not easily displaced (moved) along the filled grout material.
JP-A-8-4284

  An object of the present invention is to provide an anticorrosion lining method for a column member that can lighten the installation and removal work of a mold and can easily form an anticorrosion lining having a predetermined shape.

  In order to achieve the above object, the column member anticorrosion lining method of the present invention has a mold frame so as to surround an outer periphery of the column member, and is filled with a grout material between the mold frame and the column member. In the anticorrosion lining method of the column member for forming the anticorrosion lining covering the outer peripheral surface, the mold frame includes a fiber sheet having water permeability capable of holding a grout material, and a wire mesh body formed in a cylindrical shape. Using a formwork unit, the fiber sheet is disposed so as to be wound around the outer peripheral surface of the column member, and the wire mesh body is disposed so as to surround the outer periphery of the fiber sheet. The upper end and the lower end of the body are fixed at predetermined positions with respect to the column member, and at least the lower end of the upper end and the lower end is fastened by a belt-like fastening member. The grout material is injected from the inlet provided in the fixed fiber sheet, and the grout material is filled into the gap between the fiber sheet and the column member while removing air from the upper end of the fiber sheet. In the state where the outer peripheral surface of the fiber sheet filled with is held by a wire mesh body, the grout material is solidified to form an anticorrosion lining.

  Here, the upper ends of the fiber sheet and the wire mesh body can be fastened and fixed by a belt-like fastening member. Before injecting the grout material, a belt-like fastening member can be wound around the outer peripheral surface between the upper end portion and the lower end portion of the wire mesh body. The upper end portion and the lower end portion of the wire mesh body may be preliminarily reduced in a stepped shape. It is also possible to remove the wire mesh body after forming the anticorrosion lining and repeatedly form the anticorrosion lining.

  According to the present invention, as a formwork, a formwork unit having a water-permeable fiber sheet capable of holding a grout material and a wire mesh body formed in a cylindrical shape is used. It can be made lighter than that. And while arrange | positioning so that a fiber sheet may be wound around the outer peripheral surface of a pillar member, a wire mesh body is arrange | positioned so that the outer periphery of this fiber sheet may be enclosed, and the upper end part and lower end part of the arrange | positioned fiber sheet and wire mesh body Is fixed at a predetermined position with respect to the column member, and at least the lower end portion of the upper end portion and the lower end portion is fastened and fixed by the belt-like fastening member, so that the lower end portion of the fiber sheet and the wire mesh body is in water. Even if it is located, complicated fixing work becomes unnecessary.

  Then, the grout material is injected from the injection port provided at the lower end portion of the fiber sheet fixed to the column member, and the grout material is filled between the fiber sheet and the column member while removing air from the upper end portion of the fiber sheet. Since the outer peripheral surface of the fiber sheet filled with the grout material is held by the wire mesh body and the grout material is solidified to form an anticorrosion lining, the fiber sheet filled with the grout material depends on the weight of the grout material. Excessive swelling can be prevented.

  After forming the anti-corrosion lining, the formwork unit can remain attached. Alternatively, only the wire mesh body can be removed. Since the wire mesh body is lightweight and the lower end portion only needs to release the tightening fixing of the tightening member, even if the lower end portion is located in water, a complicated releasing operation is not necessary.

  As described above, according to the present invention, it is possible to reduce the work burden of installing and removing the mold unit, and it is possible to easily form the anticorrosion lining having a predetermined shape on the outer peripheral surface of the column member.

  Hereinafter, the anticorrosion lining method for a column member according to the present invention will be described based on the embodiments shown in the drawings.

  In a structure such as a pier, as illustrated in FIG. 1, a mold is used for a tidal zone and a splash zone of a pillar member such as a steel pipe pile 13 that is erected from the sea and supports the superstructure 14. May form an anti-corrosion lining. When carrying out the present invention, a mold unit 1 illustrated in FIG. 1 is used as a mold. This formwork unit 1 can hold the grout material G, and includes a fiber sheet 2 having water permeability and a wire mesh body 7 formed in a cylindrical shape.

  The fiber sheet 2 can hold a grout material G such as cement milk, mortar, concrete, and is made of a material having water permeability. A woven fabric, non-woven fabric, knitted fabric or the like made of a polymer material used for civil engineering or the like called so-called geotextile can be used as the material of the fiber sheet 2. For example, a high strength polyester fiber sheet is used.

  The fiber sheet 2 has a planar shape as illustrated in FIG. 2, and has joint portions 3 that join each other at both ends facing each other when formed in a cylindrical shape. By joining the joint portions 3 to each other, a cylindrical shape can be maintained as illustrated in FIG. As the joining part 3, for example, a hook-and-loop fastener can be used. When using a hook-and-loop fastener, the specification which has high joint strength (shear joint strength) with respect to the circumferential direction of the fiber sheet 2 formed in the cylinder shape is selected. When a stronger joining force is required, a binding string or a hook-and-loop strap and a binding string are used in combination instead of the hook-and-loop fastener.

  The fiber sheet 2 has the through-hole 5 in the position which becomes an upper end part and a lower end part when it forms in a cylinder shape. An inlet 6a and an air vent 6b are attached to the through hole 5.

  It is preferable that the upper end portion and the lower end portion of the fiber sheet 2 when formed into a cylindrical shape are in a reduced diameter state. Therefore, in this embodiment, when the upper end portion and the lower end portion of the fiber sheet 2 are slightly shortened and formed into a cylindrical shape, the contraction portion 4 can be formed.

  The thickness of the fiber sheet 2 is, for example, not less than 0.3 mm and not more than 3.0 mm. Although it depends on the material of the fiber sheet 2, if the sheet thickness is less than 0.3 mm, the strength tends to be insufficient, and if it exceeds 3.0 mm, the sheet rigidity becomes too high and the weight increases, resulting in poor handling. It is to do.

  As illustrated in FIGS. 4 and 5, the wire mesh body 7 is formed in a cylindrical shape by intersecting a large number of wires 8. The wire 8 may be a general material (steel material or the like) and may not use a special material.

  The wire mesh body 7 needs to be formed in a cylindrical shape so that the outer periphery of the steel pipe pile 13 can be surrounded without inserting the steel pipe pile 13. Therefore, in the embodiment, the divided body 7a obtained by dividing the cylindrical body along the cylinder axis can be formed into a cylindrical shape by being joined by a binding member 9 such as a binding wire. The number of the divided bodies 7a is not limited to two shown in the embodiment.

  The wire mesh body 7 is configured not only by the divided body 7a, but also by forming a sheet-like wire mesh into a cylindrical shape and connecting both ends facing each other by a bundling member 9 when the cylindrical shape is formed. You can also.

  The wire mesh body 7 is preferably provided with a reduced diameter portion 8a in which the upper end portion and the lower end portion thereof are previously reduced in a stepped shape. The dimensional difference D in the radial direction between the reduced diameter portion 8a and other portions is set based on the thickness of the anticorrosion lining to be formed.

  The outer diameter of the wire 8 is, for example, not less than 1.0 mm and not more than 5.0 mm. Although depending on the material of the wire 8, if the wire outer diameter is less than 1.0 mm, the wire 8 is easily deformed, and if it exceeds 5.0 mm, the weight of the wire mesh body 7 is increased and the handleability is lowered.

The size of the mesh formed by the wire 8, the weight of the wire mesh element 7, is determined in consideration of the shape-retaining performance of the filled grout G, for example, to about 25cm ² ~900cm ^2.

  A procedure for forming an anticorrosion lining in the tidal zone and the splash zone of the steel pipe pile 13 using the mold unit 1 will be described with reference to FIGS.

  First, as illustrated in FIG. 6, the fiber sheet 2 is disposed around the outer peripheral surface of the target region of the steel pipe pile 13, and the wire mesh body 7 is disposed so as to surround the outer periphery of the fiber sheet 2. . At this time, the fiber sheet 2 is formed in a cylindrical shape by joining the joint portions 3 at both ends, and the wire mesh body 7 is formed in a cylindrical shape by joining the divided bodies 7a. The fiber sheet 2 is wound so as to ensure a gap for filling the grout material G between the outer peripheral surface of the steel pipe pile 13.

  When the superstructure 14 is in the way and the anticorrosion lining cannot be formed on the upper end of the steel pipe pile 13, the elastic coating material 12 is applied in advance to the outer peripheral surface of the steel pipe pile 13 in this region. And the upper end part of the fiber sheet 2 and the wire mesh body 7 is arrange | positioned so that it may overlap with the elastic coating material 12. FIG.

  Although the fiber sheet 2 and the wire mesh body 7 can be separately arranged on the outer periphery of the steel pipe pile 13, the fiber sheet 2 is previously placed along the inner peripheral surface of the wire mesh body 7 (divided body 7a). It can also be attached and arranged so as to surround the outer periphery of the steel pipe pile 13 in a state in which both are integrated. In this case, for example, the fixed string 11 is sewn to the fiber sheet 2, and the fixed string 11 is tied to the intersection of the wires 8 of the wire mesh body 7.

  The fiber sheet 2 and the upper end and lower end of the wire mesh body 7 arranged on the outer periphery of the steel pipe pile 13 are fixed at predetermined positions with respect to the steel pipe pile 13, but at least the lower end of these upper end and lower end. Are fastened and fixed by a belt-like fastening member 10. As the tightening member 10, a lashing belt used for packing or the like, or a member configured such that a divided body obtained by dividing an annular body in a circumferential direction is assembled in an annular shape and tightened with a bolt or the like can be used.

  Since the belt-like tightening member 10 is used as a fixing means for the steel pipe pile 13 of the formwork unit 1, even if the lower ends of the fiber sheet 2 and the wire mesh body 7 are located in water, complicated fixing work is unnecessary. Become. In this embodiment, the upper end portions of the fiber sheet 2 and the wire mesh body 7 are also fastened and fixed to the steel pipe pile 13 by the belt-like tightening member 10, so that the fixing work can be further reduced.

  The upper end part (shrinking part 4) of the cylindrical fiber sheet 2 arrange | positioned on the outer periphery of the steel pipe pile 13 is made to protrude above the upper end of the wire mesh body 7, and the lower end part (shrinking part 4) of the fiber sheet 2 is The wire mesh body 7 may be projected downward from the lower end. Then, the fiber sheet 2 is firmly fixed to the steel pipe pile 13 by fixing the upper end portion and the lower end portion of the fiber sheet 2 protruding from the upper end and the lower end of the wire mesh body 7 with the belt-like tightening member 10. Can do. About the wire mesh body 7, the diameter-reduced part 8a of an upper end part and a lower end part is fastened and fixed to the steel pipe pile 13 with the belt-shaped fastening member 10. FIG.

  A belt-shaped fastening member 10 is wound around the outer peripheral surface between the upper end portion and the lower end portion of the wire mesh body 7 as necessary. As will be described later, the tightening member 10 functions so as to regulate the bulging (gripping) of the filled grout material G. The number of the fastening members 10 that regulate the bulging of the grout material G is not particularly limited.

  Next, as illustrated in FIG. 7, the grout material G is injected from the inlet 6 a provided at the lower end of the fiber sheet 3 fixed to the steel pipe pile 13. At this time, the air A inside the fiber sheet 2 is extracted through the air vent 6b provided at the upper end, and the grout material G is formed between the inner peripheral surface of the fiber sheet 2 and the outer peripheral surface of the steel pipe pile 13. Filled. Whether or not the filling of the grout material G has been completed can be confirmed by looking into the air vent 6b.

  In addition, when using normal grout material G, since it will separate if it falls freely in water, the inlet 6a is provided in the lower end part of the fiber sheet 2 formed in the cylindrical shape as in this embodiment. When the grouting material G is used, it is possible to fall freely underwater, so that the inlet 6a is not limited to the lower end of the fiber sheet 2 and can be provided at an arbitrary position.

  In the present invention, since the wire mesh body 7 is used, the fiber sheet 2 does not need to be excessively thick, and the rigidity of the fiber sheet S does not increase as the flexibility is impaired. Therefore, since the fiber sheet 2 is displaced flexibly by the filled grout material G, the filling operation does not become difficult.

  In this manner, the outer peripheral surface of the cylindrical fiber sheet 2 filled with the grout material G is held by the wire mesh body 7. Therefore, the shape of the grout material G is maintained by the wire mesh body 7 without being greatly deformed. In this state, when the filled grout material G is solidified, an anticorrosion lining made of the solidified grout material G is formed as illustrated in FIG. Therefore, by appropriately setting the radial dimension difference D between the reduced diameter portion 8a of the wire mesh body 7 and other portions, the anticorrosion lining having a predetermined shape (thickness) can be formed.

  Since the fiber sheet 2 has water permeability, moisture accumulated inside the fiber sheet 2 before the injection of the grout material G is discharged to the outside through the fiber sheet 2 by injecting the grout material G. . In addition, since moisture and excess air contained in the filled grout material G are also discharged to the outside through the fiber sheet 2, it is possible to form a dense anticorrosion lining.

  In the case where the thickness of the anticorrosion lining to be molded is large, the wire mesh body 7 may be excessively swollen due to the weight of the grout material G filled in the fiber sheet 2, but in such a case, The bulging can be prevented by the tightening member 10 wound around the outer peripheral surface between the upper end portion and the lower end portion of the wire mesh body 7. Since the wire mesh body 7 is composed of the wire 8 that is a rigid body, when the fastening member 10 that restricts the bulging is wound, the bulging can be prevented over a wide range compared to the area of the fastening member 10. .

  After forming the anticorrosion lining, the formwork unit 1 can be left attached. Alternatively, only the wire mesh body 7 can be removed. The wire mesh body 7 is lightweight, and even if the lower end portion is located in water, it is only necessary to release the fastening of the fastening member 10 that fastens and secures the lower end portion, so that complicated release work is not required. . In this embodiment, since the upper end portion of the wire mesh body 7 is also fastened and fixed to the steel pipe pile 13 by the belt-like tightening member 10, the work of removing the wire mesh body 7 can be further reduced in labor. .

  Thus, according to this invention, the work burden of installation and removal of the formwork unit 1 used as a formwork can be reduced. Moreover, it becomes possible to easily form the anticorrosion lining having a predetermined shape on the outer peripheral surface of the steel pipe pile 13.

  When the wire mesh body 7 is removed after the anticorrosion lining is formed, the removed wire mesh body 7 can be used when the anticorrosion lining is repeatedly formed. Therefore, it is an excellent construction method from the viewpoint of resource saving.

  In this invention, since the fiber sheet 2 arrange | positioned on the outer periphery of the steel pipe pile 13 and the lower end part of the wire mesh body 7 are located in the water, the belt-shaped fastening member 10 which is easy to fix and release is used. And the upper end part of the wire mesh body 7 can also be fixed to the steel pipe pile 13 using a fixing means different from the belt-shaped tightening member 10.

  For example, a ceramic insert is embedded in the lower surface of the upper work 14 supported by the upper end of the steel pipe pile 13, and the fixing member is fixed by a plastic bolt. Then, the upper end portion of the fiber sheet 2 is fixed between the fixing member and the lower surface of the upper work 14 with the upper end portion of the fiber sheet 2 formed in a cylindrical shape interposed therebetween. The upper end portion of the wire mesh body 7 may be locked to a fixing member, or may be fastened and fixed by a belt-like fastening member 10. In this fixing structure, the fiber sheet 2 can be more firmly fixed to the steel pipe pile 13.

  The present invention can be applied not only to the existing steel pipe pile 13 but also to the case where the anticorrosion lining is formed on the new steel pipe pile 13. Moreover, it can apply when forming an anticorrosion lining not only with the steel pipe pile 13 but with respect to other column members.

It is a half section front view of the anti-corrosion lining of the column member formed by this invention. It is a top view which illustrates a fiber sheet. It is a front view which illustrates the fiber sheet formed in the cylinder shape. It is explanatory drawing which illustrates the process of joining a division body and forming a wire mesh body. It is a top view which illustrates a wire mesh body. It is a longitudinal cross-sectional view which illustrates the inside of the formwork unit before inject | pouring a grout material. It is a longitudinal cross-sectional view which illustrates the inside of the formwork unit after filling a grout material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Formwork unit 2 Fiber sheet 3 Joining part 4 Shrinkage part 5 Through-hole 6a Inlet 6b Air inlet 7 Wire mesh body 7a Divided body 8 Wire 8a Reduced diameter part 9 Coupling member 10 Belt-like tightening member 11 Fixed string 12 Elasticity Coating material 13 Steel pipe pile 14 Superstructure G Grout material

Claims (5)

  In the anticorrosion lining method for a column member, a mold frame is installed so as to surround the outer periphery of the column member, and a grout material is filled between the mold frame and the column member to form an anticorrosion lining that covers the outer peripheral surface of the column member. As the mold, a mold unit comprising a fiber sheet capable of holding a grout material and having water permeability and a wire mesh body formed in a tubular shape is used, and the fiber sheet is used on the outer peripheral surface of the column member. The wire mesh body is arranged so as to surround the outer periphery of the fiber sheet, and the upper and lower ends of the arranged fiber sheet and the wire mesh body are fixed at predetermined positions with respect to the column member. Of these upper and lower ends, at least the lower end is fastened and fixed by a belt-like fastening member, and grouted from the inlet provided in the fixed fiber sheet. And injecting air from the upper end of the fiber sheet, filling the grout material between the fiber sheet and the column member, and holding the outer peripheral surface of the fiber sheet filled with the grout material with the wire mesh body. An anti-corrosion lining method for a column member that solidifies the grout material to form an anti-corrosion lining.   The column member anticorrosion lining method according to claim 1, wherein upper ends of the fiber sheet and the wire mesh body are fastened and fixed by a belt-like fastening member.   The anticorrosion lining method for a column member according to claim 1 or 2, wherein a belt-shaped fastening member is wound around an outer peripheral surface between an upper end portion and a lower end portion of the wire mesh body before the grout material is injected.   The anticorrosion lining method for a column member according to any one of claims 1 to 3, wherein an upper end portion and a lower end portion of the wire mesh body are previously reduced in a stepped shape.   The anticorrosion lining method for a pillar member according to any one of claims 1 to 4, which is used when the anticorrosion lining is formed and then the wire mesh body is removed and the anticorrosion lining is repeatedly formed.

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