JP2004183334A - Curing method for epoxy resin system double-fluid type adhesive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curing method for an epoxy resin system double-fluid type adhesive satisfying requirements such as an improvement in construction result, the stability of work, an improvement in work efficiency, the free suspension of work, power saving, the reduction of cost, and the simplification of work preparations and tidying. <P>SOLUTION: In construction work for supplying the epoxy resin system double-fluid adhesive composed of a main agent 1 and a curing agent 2 to a construction part 5 of a concrete structure 4 and curing the same, an adhesive supply means 11 including a main agent supply system 21, a curing agent supply system 31 and a mixing supply system 41 is used to feed the main agent 1 and the curing agent 2 from the main agent supply system 21 and the curing agent supply system 31 to the mixing supply system 41 to obtain an uncured mixed adhesive 3 which is supplied from the tip of the mixing supply system 41 to the construction part 5 of the concrete structure 4. The uncured adhesive 3 is cured in the construction part 5. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method for carrying out various works using two-part epoxy resin adhesives in the field of civil engineering and construction, particularly for repairing and reinforcing concrete structures. The present invention relates to an epoxy resin-based two-part adhesive curing method suitable for use.
[0002]
[Prior art]
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. 05-065768
[Patent Document 2] Japanese Patent Application Laid-Open No. 2002-121901 [0005] As described in Patent Documents 1 and 2, concrete structures include floor plates, piers, beams, outer walls, gantry, dams, dams, tunnels, and buildings. There are many different things. It is well known that concrete structures deteriorate over time. Typical degradation is cracking. Such deterioration (reduction in strength) may cause concrete to fall off. When the deterioration is severe, the internal rebar and the like may also corrode, leading to structural destruction. As a countermeasure, concrete buildings are regularly inspected, repaired and reinforced.
For repair or reinforcement of concrete buildings, an adhesive injection method, a U-cut sealing material filling method, a sealing method, a packer method, and the like have already been developed. The techniques of Patent Documents 1 and 2 also belong to any of these methods.
[0007] Among the above methods of adhesive injection, there are a manual type and a mechanical type. In any of the injection methods, there are many types in which an epoxy resin-based two-part adhesive is injected into each cracked portion of a concrete structure to close them. The methods of Patent Documents 1 and 2 also use an epoxy resin-based two-pack type as the adhesive.
In the case of the U-cut seal material filling method, a U-shaped groove is formed along a cracked portion of a concrete structure with an electric cutter, and an epoxy resin-based two-part adhesive (sealing material) is formed in the groove with a caulking gun. ) Is filled, and then pressed with a spatula to bring the substrate into close contact with the surface, so that the surface is finished smoothly.
In the sealing method, an epoxy resin-based two-part adhesive, which is a sealing material, is applied to cracks with a pate vera and the surface is smoothed.
[0010] In the packer method, an epoxy resin-based two-part adhesive is filled into a hollow portion of concrete by an injection machine to eliminate this kind of defect.
As is apparent from the above description, epoxy resin two-part adhesives are often used for repairing and reinforcing concrete structures. For example, the method of Patent Document 1 developed at the time of 1991 and the relatively recent reason is that the epoxy resin system satisfies various requirements such as adhesion, durability, water resistance, alkali resistance, and dimensional stability. It is.
[0012]
On the other hand, the following (A) to (E) have been pointed out with respect to epoxy resin-based two-part adhesives.
(A) Since it is a two-part type, extra time is consumed to mix it.
(B) Because low-pressure injection is the mainstream, mechanization and automation tend to be delayed. It makes rational work difficult and prolongs construction time.
(C) The viscosity of the adhesive changes significantly with temperature. This means that outside temperatures are greatly affected in summer and winter. If the appropriate viscosity of the adhesive cannot be maintained, stable work cannot be performed, and the finish is deteriorated.
(D) Since material inspection is an empty bag inspection, accurate checks cannot be made.
(E) It takes considerable time to clean the equipment and tools required for the work.
[0013] The method of Patent Document 1 places an emphasis on ensuring that the two epoxy-based liquids are mixed, so that it is difficult to address the problems (A) to (E). The method of Patent Document 2 is also good for repairing minute cracks in concrete, but new improvements are required to solve the problems (A) to (E).
[0014]
SUMMARY OF THE INVENTION The present invention has been made in view of such technical problems, and has been made to improve construction results, work stability, work efficiency, work interruption freedom, labor saving, cost reduction, and work preparation. It is an object of the present invention to provide an epoxy resin-based two-part adhesive curing method capable of satisfying these requirements, such as simplification of cleaning.
[0015]
The epoxy resin two-part adhesive curing method according to claim 1 of the present invention is characterized by the following means for achieving the intended purpose. That is, the construction method according to claim 1 is to supply an epoxy resin-based two-part adhesive composed of a main agent and a curing agent to a construction site of a concrete structure and to supply the main agent in a construction for curing the same. Using an adhesive supply means having a main agent supply system and a curing agent supply system for supplying the curing agent and a mixture supply system for supplying a mixture of the main agent and the curing agent by combining these two systems and supplying the same, The uncured adhesive in which the main agent and the curing agent are mixed is sent from each of the main agent supply system and the curing agent supply system to the mixed supply system, and is supplied from the tip of the mixture supply system toward the construction site of the concrete structure The uncured adhesive is cured at a construction site.
According to a second aspect of the present invention, there is provided an epoxy resin-based two-component adhesive curing method, wherein the adhesive supply means has a temperature adjusting means and / or a pressure adjusting means. And
According to a third aspect of the present invention, there is provided an epoxy resin-based two-part adhesive curing method, wherein the cleaning means for cleaning the mixed supply system is incorporated in the adhesive supply means. It is characterized by having.
[0018]
According to the method of the present invention, the main agent and the curing agent are fed from each supply system of the adhesive supply means to the mixing supply system and mixed, and the mixture (uncured adhesive) is supplied to the concrete structure from the tip of the mixing supply system. Supply to construction site. The supply mode of the adhesive to the construction site is selected according to the content of the construction. It can be adhesive application, adhesive lamination, adhesive injection or adhesive filling. Two or more of these may be performed. Thereafter, it is only necessary to wait for the uncured adhesive supplied to the construction site to cure, and thus the main construction is completed.
In the method of the present invention, as described above, the main agent and the curing agent are mixed and supplied through each system of the adhesive supplying means. The features are as follows (1) to (7).
(1) Since the transport and mixing of the adhesive are synchronized and unified, the number of work types is reduced. This leads to a streamlining of the work.
(2) The main agent and the curing agent are measured in each supply system, and the mixing ratio between the two can be suppressed to substantially zero error. As a result, the adhesive properties can be matched with the construction conditions, so that the repair and reinforcement can achieve the designed construction results.
(3) In each system, the temperature, viscosity, pressure, etc. of the base agent, curing agent, and mixture (uncured adhesive) can all be controlled. When these operations can be performed, it is possible to suppress the influence of external factors (eg, the effect of the outside temperature) even in the case of outdoor construction, and to ensure the stability of the work. This also increases the quality of the repair and reinforcement.
(4) Regardless of the type of construction, application, lamination, pouring, and filling, it is only necessary to replace the tip of the mixing and supply system such as a nozzle. A site where multiple types of construction content are mixed can be used without difficulty.
(5) Since the main agent and the curing agent can be controlled by each system of the adhesive supply means, mechanization and automation are established. In another respect, dependence on workers is greatly reduced, and a high degree of finish can be expected in mechanical work. Therefore, when combined with the above points, it is possible to improve the work efficiency and save labor while maintaining the height of the grade, and to realize a reduction in construction cost.
(6) When the supply of the main agent and the curing agent is stopped, the mixture of the two remaining in the mixed supply system hardens, and this blocks the inside of the mixed supply system. If this is left unchecked, subsequent implementation and use of the equipment will be difficult. However, the adhesive supply means includes a mixing supply system cleaning means. According to this, the inside of the mixture supply system can be cleaned without leaving the mixture. Thus, cleaning means is useful when work is interrupted or terminated. Moreover, the cleaning means guarantees freedom of work interruption.
(7) The main work preparation is only to set the main agent and the curing agent at the site, and the main cleaning is only to clean the mixing and supply system by the cleaning means.
[0020]
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an epoxy resin-based two-part adhesive curing method according to the present invention will be described with reference to the accompanying drawings.
In FIG. 1, the two-part epoxy resin adhesive comprises a main agent 1 and a curing agent 2. In these, the main agent 1 is referred to as the liquid A and the curing agent 2 is referred to as the liquid B.
Examples of the main agent 1 include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol AD type epoxy resin, novolak type epoxy resin and the like. These may be used alone or in combination. Two typical examples are as follows. The main agent 1 of the first example is composed of 100% bisphenol A type epoxy resin, and the main agent 1 of the second example is 60 to 70% by weight of bisphenol A type epoxy resin and 10 to 20% of pigment. % By weight and 20 to 30% by weight of the filler.
As the curing agent 2, aliphatic amines, modified aliphatic amines, modified aliphatic polyamines and the like are used alone or in combination. The curing agent 2 may include an ether-based diluent. If the curing agent 2 corresponds to each of the main agents 1 of the above specific example, the curing agent 2 for the main agent 1 of the first example is diluted with 45 to 55% by weight of an aliphatic amine and 20 to 30% by weight of a modified aliphatic amine. The curing agent 2 for the main component 1 of the second example is composed of 90 to 100% by weight of the modified aliphatic polyamine.
The adhesive supply means 11 illustrated in FIG. 1 has a main agent supply system 21, a curing agent supply system 31, and a mixing supply system 41.
The main agent supply system 21 illustrated in FIG. 1 feeds a liquid tank 22 for containing the main agent 1, supply pipes 23 and 24 serving as flow paths for the main agent 1, and the main agent 1 in the liquid tank 22. And a pump unit PU. As an example, the illustrated liquid tank 22 having an opening / closing lid on the upper surface is made of a known material such as a metal, a synthetic resin, and a composite material thereof. In this regard, it is desirable to have heat resistance and heat insulation. The liquid tank 22 is provided with a temperature adjusting means for maintaining the main agent 1 contained therein at a desired temperature, for example, an electric heating type heating means or a hot water type heating means. Such a liquid bath 22 can be said to be a constant temperature bath. The supply pipes 23 and 24 are also made of a known material such as metal or synthetic resin. The supply pipe 23 has a distal end branched into two parts. It is desirable that the supply pipes 23 and 24 also have heat resistance and heat insulation properties. In particular, portions exposed to the outside are preferably covered with a heat insulating material. The supply pipes 23 and 24 may be partially or wholly flexible. The pump unit PU is a combination of a plurality of pump sections P1 to P3, and also serves as a curing agent supply system 31 described later. The pump unit PU has three suction ports and two discharge ports. The proximal end of the supply pipe 23 is connected to the bottom of the liquid tank 22, the bifurcated distal end of the supply pipe 23 is connected to both suction ports of the pump unit PU, and the proximal end of the supply pipe 24 is connected to the pump unit PU. Is connected to the discharge port of
The curing agent supply system 31 illustrated in FIG. 1 includes a liquid tank 32 for containing the curing agent 2, supply pipes 33 and 34 serving as flow paths for the curing agent 2, and a curing agent in the liquid tank 32. And the pump unit PU for delivering the agent 2. The configuration of the liquid tank 32 is substantially the same as or similar to the liquid tank 22. Therefore, the liquid bath 32 also becomes a constant temperature bath. The supply pipes 33 and 34 are configured in the same manner as the supply pipes 23 and 24, but the distal end of the supply pipe 33 is not branched. The proximal end of the supply pipe 33 is connected to the bottom of the liquid tank 32, the distal end of the supply pipe 33 is connected to the remaining suction port of the pump unit PU, and the proximal end of the supply pipe 34 is connected to the remaining discharge port of the pump unit PU. Connected to port.
In the pump unit PU comprising a plurality of pump sections P1 to P3, the pressure of the main agent 1, the hardener 2, and the mixture thereof can be adjusted by adjusting the output of each pump section.
The mixing supply system 41 in FIG. 1 is mainly composed of a static mixer without a driving unit, that is, a static mixer 42. The static mixer 42 has one inlet port (two), the other outlet port (one), and a flow path between the inlet port and the outlet port. In the flow path of the static mixer 42, a stirring element for causing stirring, such as division, conversion, and inversion, of a fluid flowing therein is incorporated. A typical example of the stirring element is a rectangular plate twisted by 180 degrees, with a right element and a left element depending on the twisting direction. The size of each element is basically 1.5 times the diameter. Other components of the mixing supply system 41 are a mixing supply pipe 43 and a nozzle 44. The mixing and supply pipe 43 may be the same as each of the pipes described above, but is preferably flexible. As the nozzle 44, various types such as a spray type, a coating type, an injection type, and a filling type can be adopted. The nozzle 44 illustrated in FIG. 1 is a spray type, FIG. 2 (A) is an injection type, FIG. 2 (B) is a coating type, and FIG. 2 (C) is a filling type. The two inlet ports of the static mixer 42 are connected to the leading ends of the supply pipes 24 and 34 of the two systems 21 and 31, respectively, and the outlet port of the static mixer 42 is connected to the base end of the mixing supply pipe 43. The nozzle 44 is connected to the distal end of the mixing supply pipe 43 via a detachable connection tool. The attachment / detachment / replacement of the nozzle 44 with respect to the static mixer 42 can also be performed at a connection point between the static mixer 42 and the mixing supply pipe 43. That is, the nozzle 44 can be replaced with the mixing / supplying tube 43 attached thereto.
As apparent from FIG. 1, there are two types of cleaning means incorporated in the adhesive supply means 11. One of the cleaning means 51 includes a cleaning unit 52 of a solvent cleaning type and a cleaning liquid pipe 53. The cleaning unit 52 mainly includes a container for storing an epoxy resin solvent (cleaning liquid) and a pump for sending out the solvent therefrom. A cleaning liquid tube 53 having a valve 54 is for connecting the cleaning unit 52 to the static mixer 42. Therefore, the cleaning liquid pipe 53 has one end connected to the discharge port of the cleaning unit 52 and the other end connected to the end of the static mixer 42 on the inlet port side. The washing liquid tube 53 connected in this way leads to the inlet port of the static mixer 42. As a solvent for dissolving the epoxy resin, for example, a mixture of a halogenated hydrocarbon and propylene glycol is used, but other known or well-known solvents can also be used. This solvent is contained in the container of the cleaning unit 52. In FIG. 1, the other cleaning means 61 comprises an air-jet type cleaning unit 62 and a flexible high-pressure air supply pipe 63. The cleaning unit 62 includes an air pump or a compressor. A high-pressure air supply pipe 63 having a valve 64 is also for connecting the cleaning unit 62 to the static mixer 42. Therefore, the high-pressure air supply pipe 63 has one end connected to the discharge port of the cleaning unit 62 and the other end connected to the end of the static mixer 42 on the inlet port side. The high-pressure air supply pipe 63 connected in this way also leads to the inlet port of the static mixer 42.
With respect to the adhesive supply means 11 illustrated in FIG. 1, a control panel (for controlling the outputs of the main agent supply system 21, the hardener supply system 31, and the mixture supply system 41 and for turning them on and off). (Not shown). The control panel is also capable of adjusting the outputs of the two cleaning means 51 and 61 and turning them on and off. On the other hand, a remote controller (not shown) for remote control having a function equivalent to that of the control panel is provided on the nozzle 44 side. In this case, the remote controller may be a wired system or a wireless system.
Concrete structures to be repaired or reinforced by the method of the present invention include the above-mentioned concrete floorboards, concrete piers, concrete beams, concrete outer walls, concrete gantry, concrete dams, concrete sabo dams, tunnels and buildings. . Other than these, any concrete structure can be repaired or reinforced by the method of the present invention. Hereinafter, embodiments of the method of the present invention will be specifically described.
Referring to FIG. 1, a main agent 1 is stored in a liquid tank 22 of a main agent supply system 21, and a hardener 2 is stored in a liquid tank 32 of a hardener supply system 31. When the temperature of the outside air is low, the main agent 1 and the curing agent 2 are maintained at about room temperature (20 ° C.) via a temperature adjusting means. When the pump unit PU is turned on and each of the pump sections P1 to P3 is operated, the main agent 1 is statically controlled in the mixing / supply system 41 via the liquid tank 22 → supply pipe 23 → pump section P1 · P2 → supply pipe 24 while the pressure is adjusted. The curing agent 2 also reaches the static mixer 42 of the mixing / supplying system 41 via the liquid tank 32 → supply pipe 33 → pump section P3 → supply pipe 34 while the pressure of the curing agent 2 is adjusted. The main agent 1 and the curing agent 2 that have reached the static mixer 42 are homogeneously stirred and mixed while passing therethrough to become the uncured adhesive 3, which enters the nozzle 44 via the mixing supply pipe 43 and Is sprayed from the tip of the nozzle 44 toward the construction site 5 of the concrete structure 4. Thus, a film or layer of the uncured adhesive 3 is formed on the surface of the construction site 5, and the cured product becomes the reinforcing material and / or the repair material 6 of the concrete structure 4.
When repairing cracks in the concrete structure 4 in the above, the nozzle 44 shown in FIG. In this case, the uncured adhesive 3 is injected into the crack while applying the nozzle 44 to the construction site (cracked point) of the concrete structure 4. In this construction, a U-shaped groove may be formed along the cracked portion with an electric cutter, and the uncured adhesive 3 may be injected from the U-shaped groove. Also in such a case, the cured material of the uncured adhesive 3 injected serves as a repair material for cracks and reinforces the concrete structure 4. In addition, when the nozzle 44 shown in FIG. 2B is used, the uncured adhesive 3 can be applied to the surface (construction site) of the concrete structure 4. When the nozzle 44 shown in FIG. The uncured adhesive 3 can be filled inside the concrete structure 4 (construction site). Of course, these are also works for reinforcing or repairing the concrete structure 4.
FIG. 3 exemplifies the construction by the packer method, which is a method for eliminating a cavity (structural defect) generated in the concrete structure 4. Specifically, in FIG. 3, a hole 7 is formed in advance in the cavity (construction site 5) of the concrete structure 4, and the uncured adhesive 3 is filled in the cavity 5 by using this. . At the beginning of the filling, the packer nozzle 44 attached to the mixer head of the static mixer 42 is inserted into the drilled hole 7 so that its tip reaches the inside of the cavity 5. Then, the uncured adhesive 3 produced by the adhesive supply means 11 is filled into the cavity 5 from the tip of the nozzle 44. Thereafter, as the amount of the adhesive filled in the cavity 5 increases, the nozzle 44 is pulled out from the hole 7, and the hole 7 is similarly closed with the uncured adhesive 3. Also in this case, the work for repair and reinforcement is completed by curing the uncured adhesive 3.
In each of the above-mentioned works, the work is interrupted as necessary. Therefore, when the supply of the main agent 1 and the curing agent 2 is stopped, the uncured adhesive 3 remaining in the mixed supply system 41 is cured, and the cured product closes the inside of the mixed supply system 41. Therefore, in order to enable the subsequent operation and use of the equipment, it is necessary to quickly remove the uncured adhesive 3 as the causative substance from the mixing and supply system 41. In this case, after stopping the pump unit PU, the inside of the mixing and supply system 41 may be cleaned using the cleaning unit 51 in the first stage and using the cleaning unit 61 in the second stage. This is as follows.
Referring to FIG. 1, in the first stage, the cleaning unit 52 of the cleaning means 51 is operated. In this manner, the cleaning liquid (solvent) in the container of the cleaning unit 52 is pumped by the pump and sent out from the cleaning liquid pipe 53, and enters into the static mixer 42 through the inlet port. The cleaning liquid that has entered the static mixer 42 passes through the mixing / supplying pipe 43 to the outside through the tip of the nozzle 44 without curing the uncured adhesive 3 remaining in these paths. And carry it out. Also, if there is any that has begun to cure through these routes, the cleaning liquid carries it out. Referring to FIG. 1, in the second stage, the cleaning unit 62 of the cleaning means 61 is operated. In such a case, the high-pressure air generated by the air-jet type cleaning unit 62 enters the inside of the static mixer 42 from the inlet port via the high-pressure air supply pipe 63. The high-pressure air that has entered the static mixer 42 removes the cleaning liquid and foreign matter (residue of the cured product) remaining in these paths until the air exits from the tip of the nozzle 44 via the mixing supply pipe 43 to the outside. Take out to. Thus, the inside of the mixing supply system 41 is kept in a clean state without blockage, and is prepared for the next use.
As for the adhesive supply means in the method of the present invention, an embodiment as illustrated in FIG. 4 can be adopted. In the illustrated example, the main part of the pump unit PU is constituted by a mono pump. That is, the pump portions P4 and P5 in FIG. 4 supply the adhesive to a predetermined portion by the rotor eccentrically rotating in the stator. In this case, the rotor is made of metal and is formed of a single thread having a perfect circular cross section, and the stator is made of an elastic material and is formed of a double thread having an elliptical cross section. 4 is substantially the same as or similar to the items described in FIGS. 1 to 3.
The reinforcement work and repair work for the concrete structure performed by the method of the present invention include application, lamination, injection, and filling of the adhesive, and two or more of these may be applied to the concrete structure. . In this case, if a plurality of construction facilities illustrated in FIG.
[0039]
According to the present invention, the main agent and the curing agent are mixed in a mixed supply system to form an uncured adhesive, and the uncured adhesive is directed from the tip of the mixed supply system to the construction site of the concrete structure. It is a method of supplying and curing it at the construction site. Therefore, when the method of the present invention is used, the problems of the conventional method can be solved, thereby improving construction results, improving work stability, improving work efficiency, freeing work interruption, saving labor, reducing costs, preparing work, and cleaning up. Can be satisfied.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing an embodiment of the method of the present invention.
FIG. 2 is an explanatory view schematically showing various nozzles used in the method of the present invention.
FIG. 3 is an explanatory view schematically showing another embodiment of the method of the present invention.
FIG. 4 is an explanatory view schematically showing another example of a pump unit used in the method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main agent 2 Hardening agent 3 Unhardened adhesive 4 Concrete structure 5 Construction site 6 Reinforcement material / repair material 7 Drilling hole 11 Adhesive supply means 21 Main agent supply system 22 Liquid tank 23 Supply pipe 24 Supply pipe 31 Hardener supply system 32 Liquid tank 33 Supply pipe 34 Supply pipe 41 Mixing supply system 42 Static mixer 43 Mixing supply pipe 44 Nozzle 51 Cleaning means 52 Cleaning unit 53 Cleaning liquid pipe 54 Valve 61 Cleaning means 62 Cleaning unit 63 High pressure air supply pipe 64 Valve PU Pump unit P1 Pump Part P2 Pump part P3 Pump part P4 Pump part P5 Pump part

Claims (3)

Supplying a main agent supply system and a curing agent for supplying a main agent in a construction for supplying an epoxy resin two-part adhesive composed of a main agent and a curing agent to a construction site of a concrete structure and curing the same. A mixture of the main agent and the curing agent by combining the two systems to form a mixture of the main agent and the curing agent. The uncured adhesive in which the main agent and the curing agent are mixed is sent from each to the mixed supply system, and the uncured adhesive is supplied from the tip of the mixed supply system toward the construction site of the concrete structure, and the uncured adhesive is constructed. An epoxy resin-based two-part adhesive curing method characterized by curing at a site. 2. The epoxy resin-based two-part adhesive curing method according to claim 1, wherein the adhesive supply means has a temperature adjusting means and / or a pressure adjusting means. 3. The epoxy resin two-part adhesive curing method according to claim 1, wherein cleaning means for cleaning the mixed supply system is incorporated in the adhesive supply means.

Images