JP2012007400A - Method for repairing peeled section on thickness-increased floor slab and repairing crack on floor slab concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable, in a road or a bridge where a thickness-increased slab and asphalt are paved on an existing slab, making sure that a peeling or a narrow crack on a road is cleaned and reliably and durably repairing the peeling or the crack by resin adhesive injection.SOLUTION: The present invention comprises the processes: to drill a plurality of injection holes based on a prescribed pattern to a depth at least reaching a peeled part or a cracked part from an upper surface or a lower surface of a road or a bridge; to drill a plurality of cleaning holes near the injection holes at least in a region of the peeled part; to clean the peeled part and the injection holes by alternately supplying air and pressurized cleaning water into the cleaning holes; to execute a pilot injection of water into the injection holes after cleaning; to inject a resin adhesive by making sure that, after the pilot injection, the resin adhesive injected into one of the injection holes next to each other in the peeled part is discharged from another injection hole; and to inject the resin adhesive into all the injection holes out of the peeled part.

Description

  The present invention relates to a method for repairing a peeling portion of a thickened floor slab integrally formed on floor slab concrete such as an expressway or a bridge and repairing cracks in the floor slab concrete.

  A plurality of techniques are known as this type of repair method. The first conventional example is an aqueous epoxy resin injection material used in floor slab reinforcement injection work, and the injection material is composed of an aqueous epoxy resin, cement and an admixture, and has a coefficient of thermal expansion and elasticity. The constant volume expansion at the time of coefficient and water absorption is almost the same as that of concrete, a small amount of water-based epoxy resin is used to enhance the adhesive strength, and the use of admixtures improves workability and thixotropic properties, and makes it water-based. (Patent document 1).

  And this water-based epoxy resin injection material can adhere the concrete and mortar on the wet surface, and can adhere the concrete and the steel plate as firmly as the dry surface, and also has little decrease in the adhesive force due to aging. In addition, there is no heat generation in handling, and the containers and instruments can be washed with water, and the containers can be treated as general waste, so that handling becomes easy.

  Further, as a second conventional example, a repair method for an upper surface thickened slab, in which a void material formed in the upper surface thickened slab and / or a bridge floor slab is filled with a binder material from above, The upper thickened floor slab is tightly integrated with the filled binder material, and a hole forming step for drilling a hole in the upper thickened floor plate and an injection for injecting the binder material from the hole provided in the hole forming step And a solid integration process in which the binder material injected in the injection step is filled in a void formed in the upper surface thickened slab, and the void is filled with the filled and solidified binder material. And the hole diameter is 50 mm, the interval is 0.5 to 5 m, the binder material is a cement grout material, and has a cleaning process in which the holes are cleaned prior to the injection of the binder material. (Patent Literature ).

  And if a hole is drilled from the upper part to the lower part of the top thickened floor slab, and a binder material (cement grout material) is injected from the opening of this hole, a void (horizontal (horizontal direction) communicating with this hole The binder material (cement-type grout material) is smoothly filled in the voids spread out. The solidification of the binder material (cement-based grout material) ensures that the top thickened slab has a solid structure. Therefore, the upper surface thickened slab is reliably repaired.

JP 2000-72508 A JP 2008-208581 A

  In the invention of the conventional example 1, only the water-based epoxy resin injection material used in the floor slab reinforcement injection work is shown, and it is completely unknown how the injection material is injected to reinforce the floor slab. .

  Further, in the invention of the conventional example 2, it has a cleaning process in which the hole is cleaned prior to the injection of the binder material. For the cleaning, a fluid such as water or air is blown or sucked. It is only described that it is cleaned by doing so, and where and how the fluid is injected and sucked from where it is cleaned, or the injection state of the binder material and the cleaning situation are completely It is not described.

  And in the prior art example 2, it is supposed that the cement-type grout material whose fluidity | liquidity is J14 funnel will be used as a binder material used. However, not only is it unknown how to inject cement-based grout after the holes have been cleaned, but it is difficult for such cement-based grout materials to flow into narrow cracks, In addition, since the adhesiveness and toughness are poor, the required adhesive strength cannot be obtained, and there is a problem that reliable and strong repairs cannot be substantially performed.

  Therefore, in the prior art, it is possible to efficiently clean the peeled portions and cracks generated in the road, and use an injection material having a strong adhesive force to flow into the peeled portions and narrow cracks. There is a problem to be solved in order to be able to perform a strong repair.

  The present invention provides a specific means for solving the problems of the conventional example described above, in a road or a bridge in which an increased floor slab and asphalt pavement are formed on an existing floor slab, between the existing floor slab and the increased floor slab. A repair method for repairing cracks generated in joints of thick slabs and cracks in existing floor slabs, and having a plurality of injection holes from the upper surface or the lower surface of the road or bridge to a depth reaching at least the peeled portions or cracks Drilling based on a set pattern, a step of drilling a plurality of cleaning holes at least in the vicinity of the injection hole in the range of the peeling portion, and air and pressurized cleaning water alternately in the cleaning hole A step of cleaning the inside of the peeled portion and the injection hole, a step of pilot injecting water into the injection hole after the cleaning step, and a resin from one of the adjacent injection holes in the range of the peeled portion after the pilot injection step Glue A repairing process comprising a step of injecting a resin adhesive for confirming that it enters and discharges from the other injection hole, and a step of injecting a resin adhesive into all the injection holes outside the range of the peeling portion. The construction method is provided.

  In the present invention, the set pattern is obtained by drawing a plurality of lines in a cross shape within an interval of about 1 m; the diameter of the injection hole is about 10.5 ± 2 mm, and the diameter of the cleaning hole is Approximately 28 ± 4 mm; the cleaning pressure of the air is approximately 0.01 to 0.2 MPa, the cleaning pressure of the pressurized cleaning water is approximately 0.15 MPa or less, and the pilot driving pressure is approximately 0.7 MPa or less. The driving pressure of the resin adhesive is approximately 0.3 MPa or less; the diameter of the injection hole is such that the asphalt pavement is expanded to approximately 14.5 ± 2 mm; and the air cleaning As an additional requirement, the pressure is gradually increased while confirming air blowing from the injection hole around the cleaning hole.

  In the repair method according to the present invention, a cleaning hole is provided in addition to the injection hole, and air and pressurized cleaning water are alternately supplied and cleaned from the cleaning hole in the cleaning process, thereby removing an internal peeling portion or a cracked portion and Since the inside of the injection hole is washed by stirring with water and foam, the cleaning power is greatly improved, and by injecting water with pilot, the resin adhesive can be induced to flow into narrow cracks, In addition, the injection state can be confirmed between the adjacent injection holes in the resin adhesive injection step, and the resin adhesive is injected into all the injection holes that are outside the range of the peeled portion, so that it can be reliably and at the site to be repaired. There is an excellent effect that it can be repaired firmly.

When investigating the peeling position in the repair method of the peeling part of the thickening slab concerning an embodiment of the invention, it is a pattern figure which allocates an injection hole and a cleaning hole. It is sectional drawing which showed schematically the repair part of the peeling part regarding the repair method concerning the 1st Embodiment of this invention. It is explanatory drawing which showed schematically the process of wash | cleaning the repair part of the peeling part which concerns on the embodiment. It is explanatory drawing which showed schematically the process of inject | pouring resin into the repair part of the peeling part which concerns on the embodiment. It is sectional drawing which showed schematically the repair part of the peeling part regarding the repair method concerning the 2nd Embodiment of this invention. It is explanatory drawing which showed schematically the process of inject | pouring resin into the repair part of the peeling part which concerns on the embodiment. It is sectional drawing which showed schematically the repair part of the peeling part in an elevated highway or a bridge regarding the repair method concerning the 3rd Embodiment of this invention.

  The present invention will be described in detail based on the illustrated embodiment. In FIG. 1, for example, at a position where repair is desired on an expressway, FIG. 1 is a pattern diagram for reference for setting an injection hole for injecting a resin for repair and an injection hole for cleaning water. A pattern diagram creating step is performed in which a line 2 is drawn in a cross shape at intervals of about 1 m in advance on 1, and each intersection portion of the line 2 is a planned drilling position of the injection hole 3. In this case, the black circle portion is the injection hole 3 formed at the intersection, and the white circle portion is the injection hole 3 formed in the range A where the separation portion exists, and the inside of the separation portion is cleaned in the vicinity thereof. For this purpose, a plurality of cleaning holes 4 are formed at predetermined intervals. Moreover, the interval of the drawing pattern can be appropriately changed depending on the range to be repaired and the cracking condition. For example, when the crack width is as small as 0.05 mm or less, a pattern diagram is created at intervals of approximately 0.5 m. In some cases. In the case of repair with a small peeling range, without creating a cross-shaped drawing pattern diagram at intervals of about 0.5 m or 1 m, an injection hole or the like is provided at appropriate intervals in the peeling range. In some cases. Therefore, the creation of pattern diagrams at intervals of about 1 m is only an interval that serves as a guideline for the injection hole drilling that is preferable for the operations of cleaning and resin injection, and is not limited to this.

  Further, when the injection hole 3 and the cleaning hole 4 are formed, the separation portion is detected by judging the range A based on the sound generated by hitting the road with a 900 g hammer, taking into account the road gradient, and being arranged in the road. Alternatively, a process of detecting whether or not a reinforced reinforcing bar is present is performed, and the portion that hits the reinforcing bar is slightly displaced from the intersection and is cleaned at a position where the reinforcing bar is not cut and the cutting hole is about 10.5 mm and about 28 mm. A step of drilling holes 4 is performed. In this case, the diameters of the injection hole 3 and the cleaning hole 4 are determined by the capacity of the apparatus and the size of the instrument used to efficiently perform the work with less damage to the target object. Therefore, only a preferable range is described for implementation. That is, the injection hole 3 can be changed to substantially 10.5 ± 2 mm, and the cleaning hole 4 can be changed to substantially 28 ± 4 mm. The cleaning hole 4 is formed by selecting a position where peeling is likely (deep) at a position above the road gradient.

  In the first embodiment shown in FIG. 2, repair is performed with the asphalt pavement peeled off and removed from the upper surface, and the concrete thickened floor slab 6 is entirely exposed on the existing floor slab 5. The existing floor slab 5 is provided with an upper reinforcing bar 7 and a lower reinforcing bar 8. In such a road portion, there is a peeling portion 10 generated between the existing floor slab 5 and the thickened floor slab 6 or a peeling portion 10a generated at the joint generated when the thickening floor slab 6 is constructed. 5 has cracks 11 generated in the horizontal or vertical direction, or gaps 12 and 13 are formed below the reinforcing bars 7 and 8.

  In the road 1 that requires such repair, first, cracks that are exposed on the surface and leak the injection material injected in the repair process are investigated in advance and preliminarily surfaced with a fast-curing resin mortar or the like. Apply and seal from above. Next, the plurality of injection holes 3 and the plurality of cleaning holes 4 drilled for repairing the road 1 in the drilling process are at least as deep as the lower rebar 8 of the existing floor slab 5 and the same level position. Drilled.

  A cleaning process is performed after the drilling process. In this cleaning process, as shown in FIG. 3, the cleaning device 14 is attached to the cleaning hole 4. The cleaning device 14 includes a compressor 15, a pressure water device 16 having a variable pressure, a regulator 17, and a bifurcated cleaning plug 18 having a Y-shape. 19 is provided, and the packer portion 19 is attached to the cleaning hole 4 so as to be pressed and fixed at the position of the thickened floor slab 6.

  A regulator 17 is detachably connected to one of the bifurcated ones 18 a of the cleaning plug 18, and a pressurized water device 16 is detachably connected to the other 18 b, and pressurized air from the compressor 15 is supplied to the cleaning hole 4 via the regulator 17. In addition, the water supply 9 and the driving air from the compressor 15 are supplied to the pressurized water device 16 to supply the pressurized water (cleaning water) to the cleaning hole 4. In addition, valves 20a and 20b that can be opened and closed are provided at the bifurcated portions.

With the cleaning device 14 set in this manner and the injection hole 3 being opened, the valve 20a is opened and the valve 2b is closed. First, the compressor 15 starts from 0.01 to 0.2 MPa (0.7 MPa air pressure). Hour): Supply air of about 1 m ³ / min. In this case, if the air of suddenly high wind pressure is sent suddenly, the thickened floor slab 6 may be lifted and further increase the cracks. Therefore, the pressure is gradually increased by the regulator 17 to check for air leakage. When air leakage is not confirmed, the thickened concrete between the cleaning hole 4 and the injection hole 3 is struck with a hammer of about 900 g and penetrated.

  By supplying the air, dirt such as concrete powder and cutting waste accumulated in the peeling portions 10 and 10a, the crack 11 and the gaps 12 and 13 blows out from the surrounding injection hole 3 to the outside. If there is an injection hole 3 in which air blow-out cannot be confirmed within the range where it has been peeled off, hammering is performed again to check the state, and conversely, it is recognized as the range A of the peeled portion. The same confirmation is made when air is blown out from the injection hole 3 at a non-existing position.

  After confirming the injection hole 3 from which the air is blown out, the injection hole 3 and the peeled portion or cracked portion in the vicinity thereof are preferably cleaned in the order closer to the cleaning hole 4. This cleaning is performed with the injection hole 3 to be cleaned open and the other injection holes closed with a stopper or the like. The valve 20a is closed and the valve 20b is opened, and water of 0.15 MPa or less (at 0.7 MPa air pressure): about 1.5 L / min is appropriately supplied from the pressurized water device 16. In addition, the arrow a in a figure shows the flow direction of air or water.

  The supply of pressurized washing water is temporarily interrupted, the valve 20b is closed and the valve 20a is opened, and air is supplied from the compressor 15 by gradually increasing the pressure by the regulator 17 in the same manner as the first. By supplying the air, the cleaning water inside is bubbled and stirred to discharge water containing impurities and dirt (mud concrete powder) from the injection hole 3 to the outside. Repeat this operation until clean water without dirt comes out. The other injection holes 3 are also cleaned in order, and after the planned range of cleaning is performed, the air is finally supplied and the injection at the farthest low gradient position is performed. The washing water inside the hole 3 is discharged as much as possible. After the cleaning process is completed, the cleaning device 14 is removed from the cleaning hole 4, and the cleaning hole 4 is sealed with a stopper or the like. In this cleaning process, how to remove dirt such as muddy concrete powder is extremely important for ensuring good adhesion (repair).

  For the injection hole 3 provided outside the range A of the peeling portion, for example, a nozzle having a small diameter and a required length is provided on the cleaning plug 18 in order to remove chips or chips generated by the drilling. In addition, each injection hole 3 may be individually cleaned with air and pressurized cleaning water. The reason is that, in short, since the road is in a normal state with no peeling portion, it may be filled later with a resin adhesive for repair.

Next, a process of injecting the repairing resin adhesive shown in FIG. 4 will be described.
The resin adhesive used is a two-component, water-bonded fast-curing epoxy resin agent composed of a main agent (modified epoxy resin) and a curing agent (modified aliphatic polyamine). When both are mixed during use, Viscosity, pot life, and curing time change with temperature. Depending on the outside air temperature, the temperature of the resin adhesive is adjusted so as to obtain optimum properties for work. Since the temperature is preferably about 20 ° C., the temperature is adjusted to the optimum temperature by keeping the temperature when the outside air temperature is lower than that and by cooling when the outside temperature is high.

  It shows in Table 1 about the characteristic (physical property) value of this resin adhesive.

  An injection plug 22 with a nipple 21 that is detachable is attached to all the injection holes 3. A rubber packer portion 23 is provided on the tip end side of the injection plug 22, and the packer portion 23 is pressed against the thickened floor slab 6 and firmly attached in a watertight state. A plunger pump 24 is detachably connected to one injection plug 22 via a nipple 21. The plunger pump 24 is driven by a compressor 25, and a resin adhesive 26 is inserted into the injection plug 22 by the plunger pump 24. Then, the injection is carried out into the injection hole 3 with a required injection pressure. In addition, a vinyl tube 27 is attached to one adjacent injection plug 22 with the nipple 21 removed, and a container 28 for receiving the effluent is installed on the free end side thereof. All other injection plugs 22 are kept closed.

First, pilot injection using water is performed prior to injection of the resin adhesive. The plunger pump 24 (airless pump) used in this case is
Pump ratio: 30 to 1
Driving pressure: 0.4 MPa or less Maximum discharge flow rate: 4.2 L / min. Chips or chips at the time of drilling are removed at the minute gap in the existing floor slab. Since it cannot be cut, it takes time for the resin adhesive to penetrate and penetrate, and it is a kind of tip guide meaning for the purpose of preventing the initial hardening and efficiency reduction of the material, that is, water penetrates even with narrow cracks, so it enters the water Pilot injection is performed to create a path so that the resin can easily enter along. In this case, the driving pressure that is the cleaning pressure is set to 0.4 MPa or less because it is a pressure that allows efficient cleaning without damaging the housing, and was confirmed from the results of various experiments.

Next, the resin adhesive 26 is injected using the set plunger pump 24 (airless pump). The plunger pump 24 (airless pump) used is
Pump ratio: 40 to 1
Driving pressure ... 0.3MPa
The maximum discharge flow rate is 15 L / min, and the injected resin adhesive 26 is in the peeling portions 10 and 10 a facing the injection hole 3, in the horizontal or vertical cracks 11, and in the gaps 12 and 13. And a part thereof is directly discharged to the outside from the vinyl tube 27 attached to the adjacent injection hole 3 in an open state. When the state of the discharged resin adhesive 26 is visually observed, and impurities such as water and filth are mixed therein, the resin adhesive 26 is continuously injected until the impurities are exhausted. Bend the vinyl tube 27 to stop the outflow. In this case, the driving pressure as the injection pressure is set to 0.3 MPa because the pressure can be efficiently injected without damaging the housing, which is confirmed from the experimental results.

  By repeating such an operation sequentially between the adjacent injection holes 3, the resin adhesive 26 is injected into all the injection holes 3 in the range A of the peeling portion, and outside the range A of the peeling portion. For each injection hole 3, the resin adhesive 26 is injected through the injection plug 22 for each injection hole 3, and the water accumulated in the pilot injection is pushed out by injection of this resin adhesive, Water in the narrow vertical cracks 11 and the like is also pushed out and replaced with the resin adhesive, so that the resin adhesive can be injected efficiently and without gaps, and the resin adhesive 26 is injected into all the injection holes 3. Therefore, the whole including the cracks is reinforced regardless of the presence or absence of the peeled portion, and becomes even stronger. In addition, the arrow b in a figure shows the flow direction of a resin adhesive.

  After the resin adhesive 26 is injected, the resin adhesive is cured for about 2 hours until the resin adhesive is initially cured. When the resin adhesive is initially cured, the injection plug 22 and the plug material are removed. If there is a hole in the upper part of the injection hole 3 or the cleaning hole 4 due to these removals, the hole is filled in accordance with the upper surface of the thickened slab 6 using a quick-hardening resin mortar. If the resin pressure is high and the outside air temperature is low and the resin viscosity is high, forcibly increasing the injection pressure may cause problems such as removal of the injection plug, cracking around the injection plug, or explosion of the floor slab. There is. In such a case, not only the resin adhesive is heated, but also the thickened floor slab 6 and the existing floor slab 5 are heated by using a mat-like carbon heater to increase the temperature by 3 to 4 ° C. in about 3 hours. This allows quick injection work.

  Next, the second embodiment shown in FIGS. 5 and 6 will be described. This embodiment is a repair method performed without removing asphalt pavement on the surface of a road or a bridge. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, and the details thereof are omitted because they are the same.

  In the second embodiment, the surface asphalt pavement 30 is repaired as it is without peeling off. Of course, there are peeling portions 10, 10 a between the existing floor slab 5 and the thickened floor slab 6 or at the joint of the thickened floor slab 6, and there are horizontal or vertical cracks 11 in the existing floor slab 5 or thickened floor slab 6. That is, it is the same example as the first embodiment in that there are gaps 12 and 13 along the upper reinforcing bar 7 and the lower reinforcing bar 8.

  Then, similarly to the first embodiment, a pattern diagram for making the injection hole and the cleaning hole is created, and the injection hole 3 of about 10.5 mm is formed at a position where the reinforcing bar is not cut at each intersection. A cleaning hole 4 of about 28 mm is formed. In this case, after each injection hole 3 is formed with a diameter of about 10.5 mm, the hole 3 a provided in the asphalt pavement 30 portion is formed by expanding the hole diameter to about 14.5 mm. The reason is that the injection plug 22 is securely fixed to the thickened floor slab 6 and the pressure is released so that the asphalt pavement 30 is not lifted by the resin adhesive transmitted through the vertical crack. Also in this embodiment, it is needless to say that each hole diameter can be changed within the range of ± 2 mm to the above numerical values.

  Also in the second embodiment, the cleaning step is performed in the same manner using the cleaning device 14 as described in the first embodiment, and the injection hole 3 and the peeling portions 10, 10a, The crack 11 and the gaps 12 and 13 are cleaned.

  Further, for the injection of the resin adhesive 26 after the cleaning, as shown in FIG. 6, the injection plugs 22 with the nipples 21 that are detachable are attached to all the injection holes 3. In this case, when the injection plug 22 is inserted from the upper hole 3a of the injection hole 3, the rubber packer portion 23 is not in contact with the inner peripheral surface of the hole 3a. The sense of touching the injection hole 3 is obtained, whereby the injection plug 22 can be securely attached to the injection hole 3. The process for injecting the resin adhesive 26 is almost the same as that in the first embodiment, and the description thereof is omitted because it overlaps.

  Next, a third embodiment is shown in FIG. In the third embodiment, for example, a repair method is performed from the lower surface side of the bridge. In this case, the road 1 of the bridge has a structure in which the thick portion 5 a of the existing floor slab 5 is supported by a girder 31, and the thickened floor slab 6 and the asphalt pavement 30 are laminated on the existing floor slab 5. In addition, an upper reinforcing bar 7 and a lower reinforcing bar 8 are disposed in the existing floor slab 5.

  Further, there are peeling portions 10 and 10a between the existing floor slab 5 and the thickened floor slab 6 or at the joint of the thickened floor slab 6, and there are horizontal or vertical cracks 11 between the existing floor slab 5 and the thickened floor slab 6. Applying epoxy resin or the like in advance to seal the gaps 12 and 13 along the upper rebar 7 and lower rebar 8 and cracks that are exposed on the lower surface and the injection material leaks. This is the same example as the first embodiment.

  In the bridge road 1 having such a configuration, an injection hole 3 having a diameter of 10.5 mm and a cleaning hole 4 having a diameter of 28 mm are drilled from the lower existing floor slab 5 side. Even in this case, in order to make the substantial hole interval of the injection hole 3 approximately 1 m, it is preferable that the thick part 5a supported by the girder 31 is formed obliquely. And the terminal part of each injection hole 3 is taken as the depth which reaches the boundary part of the existing floor slab 5 and the thickening floor slab 6, ie, the position where the peeling part 10 has generate | occur | produced. The same applies to the cleaning hole 4. Also in this embodiment, it is needless to say that each hole diameter can be changed within the range of ± 2 mm to the above numerical values.

  Furthermore, although there is a difference between the upper part and the lower part in the cleaning process, substantially the same operation is performed using the cleaning device 14 as described in the first embodiment, and the injection hole 3 and The peeling part 10, 10a crack 11 and the gaps 12, 13 are washed.

  As the resin adhesive used in the third embodiment, the same type as the resin adhesive 26 shown in the first embodiment is used. Also, the injection plugs 22 attached to the injection holes 3 and the injection process of the resin adhesive are almost the same as those in the first embodiment, and are not described here because they overlap. The resin adhesive used in any of the above embodiments is preferably an epoxy resin, but in the case where water is present, an acrylic resin can be used and the water is dried. Then, urethane resin, polyester resin, vinyl ester resin, and the like can be used, and the resin adhesive is not limited to the resin described in the embodiment.

The experiment according to the first embodiment of the present invention was designated as experimental example 1, and the invention according to the conventional example 2 was designated as comparative example 1, and experiments were conducted under the same conditions.
[Experimental Example 1]
In an existing road, a plurality of 10.5 mm injection holes are drilled at 1 m intervals in an area where the thickened slab is recognized as being peeled, and a plurality of 28 mm cleaning holes are provided in the vicinity of these injection holes at a required interval. After drilling and supplying air from the cleaning hole to 0.1 MPa: 1 m ³ / min and confirming the ejection of air from the surrounding injection hole, water is supplied from the cleaning hole to about 0.1 Pma: 1.5 L / min. After supplying and discharging the dirt existing in the gap in the thickened slab together with water to the outside through the injection hole (cleaning process), air is supplied again to remove the dirt together with the water inside. Along with this exclusion action, thin tubes were inserted in order into all of the injection holes and cleaning holes and removed by suction.

  Next, pilot injection with fresh water was performed. In this pilot injection, fresh water permeates into a narrow gap (crack) of 0.05 mm or less inside by injecting fresh water from the cleaning hole at 0.4 MPa: 4.2 L / min for approximately 1 minute. Thereafter, a resin adhesive is sequentially injected from each injection hole. The viscosity of this resin adhesive is 600 mPa · s. At the time of injection, the cleaning hole is closed with a required plug member, one adjacent injection hole is opened, and the other one injection hole is 0.3 MPa: 15 L When the injection is performed at a rate of / min, the pilot water gradually overflows from the opened injection hole side, and the injection is stopped when the resin adhesive is discharged. In the same manner, resin adhesive was injected from the other injection holes to fill all the injection holes, and the cleaning holes were filled with fast-curing resin mortar.

[Comparative Example 1]
On the same existing road as in Experimental Example 1, a plurality (5, 6) of 50 mm holes were drilled at an interval of 1 m in an area where the thickened floor slab was found to be peeled off at the same date and time. Water is supplied from one hole (5) adjacent to these holes (as for the supply of water, there is no description about the amount, injection pressure, etc., so that it is in line with Experimental Example 1) 0.1 PMa: 1.5 L / After supplying the water for about 5 minutes and causing the dirt present in the gap in the thickening slab to overflow from the other hole (6) together with water, the compressed air is injected for about 5 minutes from one hole (5). The inner walls of the holes and voids were dried.

As the cement grout material, a cement grout material that faithfully reproduced the material composition described in the specification of Comparative Example 1 and had a flowability of 20 seconds or less with a J14 funnel was used. This grout material is opened (since there is no description about how to inject the grout material), one adjacent injection hole (6) is opened, and the other one injection hole is injected at 0.3 MPa: 15 L / min, Stop the injection with the cement grout material visible from the open injection hole side. In the same manner, cement grout material was injected, and the space remaining in the upper part of the hole was filled with cement grout material from the upper part to fill all holes.
In addition, in the injection of the cement grout material, in order for the cement grout material injected from one hole to be discharged from the other hole, the grout material is poorly slidable, so it takes time and the injection pressure must be raised, The injection was stopped to the extent that it was visible.

[Experimental result]
The experimental example 1 and the comparative example 1 were examined after collecting 50 mm core samples at a plurality of locations (three locations) after 24 hours. As a result, one experimental example 1 had a narrow gap (cracked) of 0.05 mm or less. ) Also infiltrated the resin adhesive, filling the gaps and confirming strong adhesive strength. In the other Comparative Example 1, the cement grout material entered the gap (crack) of 0.1 mm or more, but hardly entered the narrow gap of 0.05 mm or less. In addition, even in places where cement grout material has intruded and solidified, dirt such as concrete powder and cutting waste remains on the adhesive surface, and it can be peeled off with a little twist by hand. Could not be confirmed.

  From the above experimental results, the resin adhesive of Experimental Example 1 has low viscosity and good sliding properties, so that it is guided to the pilot water and penetrates into narrow gaps (cracks) to completely fill the gaps and cure. In this state, it is firmly bonded integrally with the thickened floor slab, it is confirmed that the adhesive strength is strong, and it is suitable for repairing roads where there are many cracks of 0.05 mm or less and which is a problem. It was recognized. The cement grout material of the other comparative example 1 is mixed with silica sand as an aggregate even if it is said to have good fluidity, so that it cannot penetrate into a narrow gap of 0.1 mm or less, but also solidifies. It was confirmed that it was not suitable for repairing the road in question, because it was weakly compatible with the thickened floor slab or its adhesiveness.

  In particular, due to the delamination phenomenon between floor slab concrete and thickened floor slabs on highways, the thickened floor slab has many narrow gaps due to cracks of 0.05 mm or less, and the narrow gaps travel. Cracks gradually expand due to vibrations caused by automobiles and trucks. Cement grout materials that are brittle and have low adhesive strength are crushed by vibrations, so they are virtually unsuitable for repairing this type of road. This became clear from the experimental results.

  About the exfoliation part repair of the thickening slab and the crack repair method of floor slab concrete according to the present invention, a pattern in which a plurality of injection holes are set from the upper surface or the lower surface of the road or bridge to the depth reaching at least the exfoliation part or the crack part. And a step of drilling a plurality of cleaning holes in the vicinity of the injection hole at least in the range of the peeling portion, and a cleaning device capable of supplying air and water to the cleaning holes. And a step of alternately supplying pressurized washing water and washing, a step of pilot injecting water after the washing step, and a resin adhesive being injected from one of the adjacent injection holes after the pilot injection step By adopting a configuration comprising the step of confirming the discharge from the injection hole, it can be widely used in any situation road or bridge.

1 Road or bridge 2 Cross-shaped line (pattern)
3 Injection hole 3a Expanded hole (asphalt pavement part)
4 Washing hole 5 Existing floor slab 5a Thick part of existing floor slab 6 Thickening floor slab 7 Upper rebar 8 Lower rebar 9 Water supply 10, 10a Peeling part 11 Crack 12, 13 Crevice 14 Washing device 15, 25 Compressor 16 Pressurized water device 17 Regulator 18 Cleaning plug 19 Packer part 20a, 20b Valve
21 Nipple 22 Injection plug 23 Packer part 24 Plunger pump 26 Resin adhesive
27 Vinyl tube 28 Container 30 Asphalt pavement 31 Digit

Claims (6)

On roads or bridges with thickened floor slabs and asphalt pavement on existing floor slabs, cracks generated between the existing floor slabs and thickened floor slabs and in the joints of thickened floor slabs and in existing floor slabs A repair method for repairing
Drilling a plurality of injection holes based on a set pattern from the upper surface or the lower surface of the road or bridge to a depth reaching at least the peeled portion or the cracked portion;
Drilling a plurality of cleaning holes in the vicinity of the injection hole at least in the range of the peeling portion; and
Alternately supplying air and pressurized cleaning water to the cleaning hole to clean the inside of the peeling portion and the injection hole;
A step of pilot injecting water into the injection hole after the cleaning step;
After the pilot injection step, the resin adhesive injection step for confirming that the resin adhesive is injected from one of the adjacent injection holes in the range of the peeling portion and discharged from the other injection hole is outside the range of the peeling portion. A repair method characterized by comprising a step of injecting a resin adhesive into all injection holes. The repair method according to claim 1, wherein the set pattern is obtained by drawing a plurality of lines in a cross shape within an interval of about 1 m. The repair method according to claim 1, wherein the diameter of the injection hole is approximately 10.5 ± 2 mm, and the diameter of the cleaning hole is approximately 28 ± 4 mm. The cleaning pressure of the air is approximately 0.01 to 0.2 MPa, the cleaning pressure of the pressurized cleaning water is approximately 0.15 MPa or less, the pilot driving pressure is approximately 0.4 MPa or less, and the resin adhesive The repairing method according to claim 1, wherein the driving pressure is approximately 0.3 MPa or less. The repair method according to claim 1 or 3, wherein a diameter of the asphalt pavement is expanded to 14.5 ± 2 mm in the diameter of the injection hole. 5. The repair method according to claim 1, wherein the cleaning pressure of the air is gradually increased while confirming air blowing from an injection hole around the cleaning hole.

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