JP2019183591A - Repair method of structure with crack - Google Patents

Abstract

To provide a repair method capable of injecting inorganic materials from an inside of a crack into void such as a crack and an internal defect at high quality and efficiently, in repairing a crack of a structure.SOLUTION: An injection hole 10 for injecting inorganic injection material for repairing a crack is drilled from a position with a prescribed distance from a crack 11 on a structure surface so as to diagonally cross the crack 11. An injection plug 1 for injecting the inorganic injection material is inserted into an opening on the structure surface of the injection hole 10. Water is pressed in to remove impurities inside the crack from the injection plug 1 and to wash it. Then, the inorganic injection material is injected via the injection plug 1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for repairing cracks and internal defects in structures typified by concrete.

Concrete is widely used in various structures, but cracks may occur due to the following causes.
(1) Shrinkage due to hardening reaction of concrete (2) External factors due to ground fluctuation or load (3) Expansion / shrinkage due to environmental conditions (4) Freezing and expansion of moisture soaked inside (5) Alkali bone Expansion of aggregate due to material reaction (6) Rusting of internal steel (rebar)

  As a method for repairing cracks, Patent Document 1 discloses that a base of an injection plug is fixed with an adhesive to a crack surface exposed on the surface of a structure, a resin pressure tank is attached, and the injection material is filled in the tank. Thus, a method of compressing the air in the tank and press-fitting with the restoring expansion force of the air is disclosed.

  Further, in Patent Document 2, the pedestal of the injection plug is fixed to the crack surface exposed on the surface of the structure with an adhesive, and the cylindrical material injector is filled with the injection material to be pressurized and expanded. A method is disclosed in which a repair material is press-fitted into a crack by a shape restoring force of the material.

JP2003-129675A JP 2004-169550 A

Problems to be solved by the invention

  However, the crack repair methods disclosed in Patent Documents 1 and 2 are designed to inject a low-viscosity epoxy resin into a relatively new crack at a low pressure and a low speed. Injection was difficult when there were dirt on the cracked surface or obstructions found in the civil engineering structure that had passed. Moreover, since the repair material injected into the crack is different from the material of the structure, there is room for improvement from the viewpoint of affinity.

  Furthermore, in the case of injecting an inorganic material typified by a cement material by the same method as described above, due to the difference in the settling speed of the material constituting the material due to the difference in specific gravity in the process of injecting at a low speed There was a problem of occurrence of separation and dryout due to water absorption on the structure side.

  The present invention has been made in view of the above problems, and in repairing cracks in a structure, an inorganic material of the same quality as the base material is introduced into the voids such as cracks and internal defects from the inside of the cracks. The object is to provide a repair method that can be injected efficiently with high quality.

  The present invention has been made as a result of intensive studies on a method of filling a crack with a repair material in order to solve the above problems.

    That is, the present invention is a crack repairing method for repairing a structure having a crack inside by filling the crack with an inorganic injection material, and maintains a certain distance from the crack along the crack. A step of marking a plurality of drilling positions at intervals corresponding to the cracks, and an injection for drilling an injection hole obliquely penetrating inside the crack at the marked drilling position by a hydrodynamic drill A hole drilling step, an injection plug mounting step for inserting and fixing an injection plug for injecting the inorganic injection material, and injection of purified water into the crack from the injection plug, A crack cleaning step for cleaning and wetting the inside of the crack, and when the inorganic injection material is injected from the injection plug, the crack is the surface of the structure. In order to prevent the injection material from leaking from the open crack opening, a crack opening opening sealing step for closing the crack opening with an inorganic seal material, and the inorganic injection material in the crack An inorganic injection material filling step for filling with an injection pump through the injection plug; a plug / seal removal step for removing the injection plug and the inorganic sealing material after the inorganic injection material is cured; and It has the finishing process which fills the bottomed hole which arises by removal of an injection | pouring plug with the repair mortar, and cleans the surface of the said structure.

  Further, the present invention provides the injection hole drilling step in which, since the injection hole penetrates the crack inside, the injection hole is formed on the surface of the structure from a position at a certain distance from the crack opening. It is inclined to form an angle of 45 ° or more and 60 ° or less with respect to the normal line, and drilling is performed while washing cutting dust with a water flow type drill.

  In the present invention, the injection plug has a substantially cylindrical shape in which an injection material passage hole through which the inorganic injection material passes is formed in the center, and a small diameter portion is formed on the discharge side of the inorganic injection material. A hollow shaft in which a large diameter portion is formed on the press-fitting side of the inorganic injection material, and a backflow prevention mechanism for preventing a backflow of the inorganic injection material formed in the large diameter portion, An injection plug that does not require an adhesive or a special tool for mounting is used by providing a fixing portion formed by mounting bellows packing made of an elastic material on the outer periphery of the small diameter portion.

  Further, the present invention provides a plastic cartridge in which the inorganic sealing material and the inorganic injection material are filled with a specified amount of cementitious material powder, and a specified amount of purified water or dedicated blended water is used at the time of use. In addition, it is prepared by mixing.

The invention's effect

  In the present invention, an injection hole for inserting and fixing an injection plug for injecting an inorganic-based injection material at a predetermined interval along the crack using a hydrodynamic drill is provided. Perforate. This is because the range in which the inorganic injection material can be injected into the crack from one injection hole is limited, and by providing a plurality of injection holes at appropriate intervals, a sufficient amount can be provided inside the crack. It can be filled with an inorganic injection material.

  In many cases, there are clogs due to dust or deposits inside the cracks, and if an inorganic injection material is injected directly from the opening where the cracks are exposed to the surface, the influence of the clogs will strongly affect the cracks. In the present invention, the inorganic injection material may not be sufficiently filled up to the inside, but in the present invention, the inorganic injection material is injected from the inside of the crack by drilling the injection hole obliquely so as to penetrate the crack inside the structure. This problem can be greatly reduced because it can be injected. The reason why the injection hole is set to 45 ° or more and 60 ° or less with respect to the normal of the surface of the structure is that fixing the plug is difficult at an angle smaller than this, and at an angle larger than this, the injection hole is cracked. This is because the reaching distance becomes excessively long.

  Further, in the present invention, by using a hydrodynamic drill for drilling the injection hole, the concrete cutting powder generated by the drilling is drilled while being washed away, so that a clean injection hole free from clogging that leads to cracks can be provided. .

  Further, in the present invention, the fixing side of the injection plug is provided with a bellows packing made of an elastic material, and the injection plug inserted into the injection hole can be easily fixed, and an adhesive or a special tool is used. This is unnecessary and contributes to shortening the construction time. Moreover, the removal operation after the completion of the injection operation is easy.

  In addition, in the present invention, before injecting the inorganic injection material into the crack, by injecting clean water from the injection plug under pressure, the inorganic injection into the crack gap is performed by washing away dust and dirt inside the crack. It is possible to improve the filling property and adhesiveness of the material, and to wet the inorganic injection material to prevent dry-out. The purified water used here is water that does not contain impurities such as mud and salt, and tap water can be used.

  In addition, the injection plug used in the present invention includes the bellows packing for fixing as described above, and the valve is opened by applying injection pressure by a valve urged by a compression spring, and when the injection is finished, the valve is opened. A backflow prevention mechanism that closes and prevents backflow is provided. In addition, by installing a check valve release pin for opening the check valve, it serves as a leak port for the injection material injected from the injection plug installed elsewhere, and an air vent port for releasing the internal pressure. It can be used as three types of functions.

  In addition, when a cement-based material and water are mixed in advance, it is difficult to ensure a certain fluidity at the time of injection, especially in a cement-based material that is fast-cured. Therefore, the inorganic-based injection material used in the present invention Then, using a product prepared by filling a plastic cartridge with a specified amount of cementitious material powder, add the specified amount of purified water or blended water and shake it just before using the material. Inorganic sealing materials and inorganic injection materials can be obtained, and by using these materials with a manual injection pump, it is possible to ensure stable material quality without compounding errors, improve workability on closed or scaffolding, and empty cartridges. Accurate management of the injection volume by the body becomes possible.

It is a figure which shows an example of the injection | pouring plug used for this invention, Fig.1 (a) is a front view, FIG.1 (b) is sectional drawing. Sectional drawing of an example of the non-return valve opening pin used for this invention FIG. 3 is a cross-sectional view showing a crack generated inside a structure from a direction perpendicular to a surface formed by the crack, and showing a basic configuration of the injection hole installation method according to the present invention. The figure which shows the arrangement | sequence structure of the injection | pouring plug installed in the space | interval corresponding to a crack which looked at FIG. 3 from the horizontal direction in a figure Construction process diagram showing process of repair method to repair structure

  Next, an embodiment of the present invention will be described based on a diagram showing a specific example.

  1A and 1B are diagrams showing an example of an injection plug used in the present invention. FIG. 1A is a front view and FIG. 1B is a cross-sectional view. FIG. 2 is a front view showing an example of a check valve opening pin used in the present invention.

  In the injection plug 1 shown in FIGS. 1A and 1B, the left end in FIGS. 1A and 1B is inserted into the injection hole. The bellows packing 2 is made of a rubber-based elastic material, and is configured such that the outer diameter is larger than the inner diameter of the injection hole, and by giving a tapered shape in which the outer diameter decreases toward the left end in the figure, By being driven into the injection hole using a plastic hammer or the like, the bellows packing 2 is fixed inside the injection hole by the elasticity.

  Further, the check valve release pin 6 is inserted into the injection plug 1 in FIG. 1A from the direction of the arrow shown in FIG. 1B, and inserted and fixed until the locking portion 8 reaches the right end of the injection plug. As a result, the check valve 5a is pushed in the direction of the arrow in the figure, and the check valve mechanism 5 is opened.

  FIG. 3 is a cross-sectional view showing a crack generated in the structure from a direction perpendicular to the surface where the crack is formed, and shows a basic configuration of the injection hole installation method according to the present invention. As shown in FIG. 3, the injection hole 10 is obliquely drilled with a water flow drill with the angle θ shown in the figure being 45 ° to 60 ° with respect to the normal of the structure surface. The effective length is 220 mm as a necessary length for penetrating the crack at a depth of, for example, about 100 mm from the surface of the structure, that is, a / sin θ when the depth is a as shown in FIG. It is desirable to use an electric drill having a no-load rotational speed of about 10,000 (times / minute), which is the rotational speed of the drill necessary for drilling the injection hole.

  After the injection hole 10 is drilled, as shown in FIG. 3, the injection plug 1 is inserted, and purified water is pressurized and injected into the crack 11 through the injection plug 1 and cleaned, and the opening is opened with the inorganic sealing material 12. 11a is closed. In this way, by washing away dust and dirt accumulated inside the crack in advance, it is possible to remove the factor that hinders the injection of the repair material into the crack gap and greatly improve the filling property and adhesion of the repair material. Furthermore, wetting is possible to prevent dry out of the inorganic injection material.

  As a material used for inorganic seals, for example, a so-called ultra-fast cement powder that hardens within 10 to 30 minutes is filled into a plastic cartridge in a specified amount, and a specified amount of purified water is added when the material is used. By using a caulking gun or the like, a cartridge type inorganic sealing material that can obtain a stable ultra-high speed cement sealing material by shaking. In addition, as for the inorganic type injection material used for filling of cracks, various materials can be blended and selected according to the deterioration property of the structure.

  FIG. 4 is a diagram showing an arrangement configuration of injection plugs installed at intervals to be applied to cracks when the crack surface is viewed from the lateral direction. FIG. 4 (a) shows a basic configuration of the above-described injection site installation method, in which a cartridge 15 filled with an inorganic injection material along a crack is inserted into an injection plug, and a manual injection pump (not shown). The state where the inorganic filler is filled in the crack is shown.

  FIG. 4B shows an injection in which the check valve release pin 14a is attached when the inorganic injection material injected from the cartridge 15 accumulates in the crack and the material water level reaches the adjacent plug position. The state where the completion of filling of the material can be confirmed by being discharged from the plug is shown. FIG. 4C shows a state where the air inside the crack is discharged from the injection plug to which the check valve release pin 14b is attached, and the internal pressure that inhibits the filling of the inorganic injection material is released.

  After completion of the injection of the inorganic injection material, the cartridge 15 is removed, and the check plug opening pins 14a and 14b attached to the injection plug and the injection plug are adjacent to each other in the directions (b) to (c) in FIG. The inorganic injection material is injected into the crack while sequentially moving to the injection plug.

  FIG. 5 is a construction process diagram showing a process of a repair method for repairing a structure. The injection hole marking step (1) is a step of marking the thousand positions along the cracks generated in the structure at intervals applied to the crack width.

  The injection hole drilling step (2) is a step of drilling an injection hole of about 10.5 mm, for example, at the marked drilling position. In the method of drilling the injection hole, the hydrodynamic drill is inclined at an appropriate angle with respect to the normal of the surface of the structure to be repaired at a position spaced apart from the generated crack. Drill to penetrate inside the crack.

  The injection plug mounting step (3) is a step of inserting and fixing the injection plug into the drilled injection hole. Since the bellows packing of the fixing portion has a tapered angle, it can be easily inserted into the perforated hole, and can be securely attached by lightly driving it with a rubber hammer or the like. At the time of installation, no adhesive or special tools are required, and an injection operation can be performed immediately after installation, thereby shortening the construction time.

  The crack cleaning process (4) is a process in which purified water such as tap water is injected under pressure from the attached injection plug with a water supply pump or the like to clean the inside of the crack. The injected purified water springs out from the crack surface and flushes out deposits such as dust and dirt inside the crack, thereby improving the filling property of the inorganic injection material. In addition, by pre-injecting the purified water under pressure, it also serves to confirm the continuous range of cracks that have occurred and to prevent dryout that occurs when the cement-based injection material is absorbed by the structure body.

  The crack sealing step (5) is a step of closing the crack surface with the sealing material in order to prevent leakage of the material from the crack surface when filling the injection material. By using a cartridge-type inorganic sealing material, the construction time can be shortened due to the fact that construction on a wet surface is possible and the curing is fast. In addition, inorganic sealing materials are easy to remove and have good appearance recovery.

  In the filling material filling step (6), the cartridge type inorganic filling material was appropriately pressurized by the filling pump from the filling plug attached to the lowermost part or the end part of the target crack, and the check valve was opened. While confirming material leakage from the adjacent plug, the process proceeds to the next plug in sequence. By using cartridge-type inorganic injection material, the required amount can be kneaded on the spot, eliminating material waste due to excessive kneading so far, and managing the number of cartridges makes it easy to manage the injection amount Become.

  The plug / seal material removing step (7) is a step of removing the sealing material by pulling out the injection plug from the injection hole after the filled material is cured. Since the injection plug is fixed only by the gripping force of the bellows packing, it can be removed in a short time without a special tool. The cement-based sealing material can be easily removed by lightly hitting with a leather skin or a flat chisel.

  The perforated hole filling / finishing step (8) is a step of filling the bottomed hole after removing the plug with repair mortar or the like and finishing it smoothly. The mortar used for restoration should be of the same or better performance than the base material concrete of the structure.

  As described above, according to the present invention, the crack injection method using an inorganic injection material, which was difficult to construct by the conventional method, is constituted by a method and a process that fully considers the properties of the material. It can be said that the effect of reducing the environmental load due to the crack cleaning process that improves the construction quality that is not present and the fact that all the materials used are made of inorganic materials. The present invention is not limited to the above-described embodiment, and includes various modifications and corrections that can be conceived as long as they have ordinary knowledge in the field of the present invention. There is no doubt that the present invention is included in the present invention even if there is a design change.

DESCRIPTION OF SYMBOLS 1 ... Injection plug 2 ... Bellows packing 3 ... Small diameter part 4 ... Large diameter part 5 ... Backflow prevention mechanism 5a ... Check valve 5b ... Compression spring 6... Check valve release pin 7... Holding part 8... Locking part 9... Opening groove 10 ... Injection hole 11 ... Crack 11 a. ... Inorganic-based sealing material 13 ... Rebars 14a, 14b ... Plug 15 with check valve open pin attached ... Cartridge

Claims (5)

  A crack repairing method for repairing a structure having a crack inside by filling the crack with an inorganic injection material, and in the crack, at a position maintaining a certain distance from the crack along the crack. A step of marking a plurality of drilling positions at corresponding intervals, and an injection hole drilling process of drilling an injection hole obliquely penetrating inside the crack at the marked drilling position by a hydrodynamic drill; An injection plug mounting step for inserting and fixing an injection plug for injecting the inorganic injection material into the injection hole, and clean water is injected into the crack from the injection plug to clean and wet the inside of the crack. And a crack cleaning step for forming a crack, and when the inorganic injection material is injected from the injection plug, the crack is open to the surface of the structure. In order to prevent the injection material from leaking from the crack opening, a crack opening opening sealing step for closing the crack opening with an inorganic sealing material, and the inorganic injection material inside the crack, the injection plug Via an injection pump for filling with an inorganic injection material, a plug / seal removal step for removing the injection plug and the inorganic sealing material after the inorganic injection material is cured, and removal of the injection plug A crack repairing method for a structure, comprising a finishing step of filling a bottomed hole generated by the above with a repairing mortar and finishing the surface of the structure.   In the injection hole drilling step, since the injection hole penetrates the crack inside, the injection hole is 45 ° away from a normal line of the structure surface from a position at a certain distance from the crack opening. 2. The method of repairing a crack in a structure according to claim 1, wherein the drilling is performed so as to form an angle of not less than 60 [deg.] And not more than 60 [deg.] And the cutting dust is washed away with a water-flow drill.   The injection plug has a substantially cylindrical shape in which an injection material passage hole through which the inorganic injection material passes is formed at the center, and a small-diameter portion is formed on a discharge side of the inorganic injection material, and the inorganic injection material A hollow shaft formed with a large-diameter portion on the press-fitting side of the material, a backflow prevention mechanism for preventing backflow of the inorganic injection material formed inside the large-diameter portion, and an outer periphery of the small-diameter portion 3. The crack repair of a structure according to claim 1, wherein an adhesive or a special tool is not required for installation by providing a fixing portion formed by mounting a bellows packing made of an elastic material. Method.   2. The inorganic sealing material is prepared by adding a specified amount of purified water to a plastic cartridge filled with a specified amount of cementitious material powder and mixing at the time of use. An inorganic sealing material as described in 1.   The inorganic injection material is prepared by adding a specified amount of exclusive blended water to a plastic cartridge filled with a specified amount of cementitious material powder and mixing it at the time of use. The inorganic injection material in any one of Claim 1 or Claim 3.

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