JP6608131B2 - Repair method and repair structure of concrete structure using repair panel - Google Patents

Description

  The present invention relates to a repair method and a repair structure of a concrete structure using a repair panel. More specifically, the present invention relates to a repair of a concrete structure such as a bridge wall rail or a side wall of an observer passage in a tunnel in a short period of time. The present invention relates to a method for repairing a concrete structure that can be easily performed and a repair structure constructed by the method.

  For example, concrete structures such as bridge wall railings and the side walls of surveillance passages in tunnels may have deteriorated due to insufficient covering of steel bars or neutralization, and are included in antifreeze agents. In some cases, the salt-containing water is deteriorated due to salt damage caused by splashing up as the vehicle travels. Conventionally, as a repair method for such deterioration, a method of repairing a cross section by a spraying method or a formwork method (first method) after repairing deteriorated concrete, or using a repair panel, A method (second method) is known in which a mortar is filled in the gap between the repair panel and the existing concrete after the steel plate is fixed to the existing concrete using a fixing bracket (Japanese Patent Laid-Open No. 2012-62628). Publication).

  In the case of the first method among these methods, it is necessary to coat the repaired concrete surface in order to ensure long-term durability, but there is a problem that it is necessary to periodically repaint thereafter. In the case of the second method, the repair panel is painted and the joints between the panels are sealed, and also in this case, it is necessary to periodically repaint and repair the sealing material thereafter. The cycle of repainting and the like is determined by the durability of the coating (coating film). However, no matter how good the coating is, the cycle is about 20 to 25 years.

  In any of the above methods, main line (lane) regulation is required at the time of work, but the second method has the advantage that the construction period is shorter than that of the first method, so that it is used more frequently. ing. However, even in such a case, there is no change in the operation of ordinary vehicles during the construction period, so further shortening of the construction period is required and the construction can be rationalized. Therefore, a method that eliminates the need for maintenance such as repainting has been desired.

JP 2012-62628 A

  As described above, conventionally, as a method of repairing a deteriorated concrete structure, after removing the deteriorated concrete, a method of repairing a cross section by a spraying method or a formwork method, a repair panel, One of the methods of repairing by filling the gaps between the existing concrete with mortar etc. has been implemented, but in either case, the construction period is long and the main line (lane) regulation is required during that period Therefore, there has been a problem that smooth running of the vehicle is hindered for a long time.

  The present invention was made in order to solve the problems in the conventional method, the construction is easy, the construction period is short, the main line (lane) regulation days can be shortened, and the construction can be rationalized. It is an object of the present invention to provide a repair method and a repair structure for a concrete structure using a repair panel that does not require maintenance such as repainting.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have obtained knowledge that it is necessary to satisfy all the following sub-problems a to f in order to solve the above-mentioned problems. It was.
a. Reduce the weight of the repair panel in the second method of the above conventional methods and improve the construction ability b. Develop a repair panel with salt barrier and neutralization prevention that can omit painting c. Develop a long-lasting vertical joint structure that can absorb errors when standing in the repair panel and prevent the entry of deterioration factors d. To develop a horizontal joint structure at the lower end of the panel that makes it easy to set up and set up the repair panel, reduces the error during standing (the gap between the vertical joints), and prevents the entry of deterioration factors e. Develop a structure of the upper part of the repair panel (top edge) that can prevent deterioration factors from entering the gap between the repair panel and the cross-section repair material, and does not require protection by painting f. Realize a structure that can resist the load at the time of construction such as mortar injection and can self-support the repair panel.

The inventors of the present invention have completed the present invention by solving all of the above small problems. That is, the invention according to claim 1 for solving the above problem is
A process of picking up the parts to be repaired in the concrete structure to be repaired,
A panel guide laying in which a panel guide having a groove for receiving the lower end portion of the repair panel is arranged along the lower part of the suspension surface of the concrete structure so as to be integrated with the suspension surface of the concrete structure with a mortar material. Process,
A plurality of the repair panels, a repair panel upset process of dropping the lower end portion of the repair panels into the groove of the panel guide and standing side by side;
A mortar injecting step of injecting mortar into the gap between the upright restoration panel and the suspension surface of the concrete structure;
A vertical joint treatment process for preventing the entry of deterioration factors into the vertical joint between the repair panels that have stood up,
The top end processing step of processing the top end of the concrete structure and the repair panel,
The restoration panel is made of ultra-high-strength fiber reinforced concrete, and the standing of the panel guide in the standing step into the groove has a salt-blocking property and a neutralization preventing property in the groove. A method for repairing a concrete structure, which is performed after filling with a filler .

The repair panel is a lightweight panel having a salt-blocking property and neutralization-preventing property that can be omitted. Upon In one embodiment, bored positioning holes in the groove as well as projecting the anchor bolts to the lower surface of the front Symbol repair panel, Tatsukomi into the groove of the repair panel in the repair panel elevational inclusive process, The anchor bolt is inserted into the positioning hole.

  Moreover, in one Embodiment, the joint filler which has salt-insulating property and neutralization prevention property is filled into the hollow part produced | generated between the end surfaces of the said adjacent repair panel in the said vertical joint processing process. In that case, a connecting material for receiving the end of the other repair panel provided with the vertical groove is attached to an end of one of the adjacent repair panels, and the connection between the connecting material and the vertical groove. In some cases, the hollow portion generated in the above is filled with the joint filler having the above-described salt-blocking property and neutralization-preventing property.

  Moreover, in one Embodiment, prior to the said mortar injection | pouring process, the upper part of the said restoration panel and the upper part of the said concrete structure are connected via a connection metal fitting. The top end portion is treated by applying an epoxy resin or other resin paint to the suspended portion of the top end portion and covering the top with a mortar.

Moreover, the invention according to claim 8 for solving the above-mentioned problem is an ultra-high salt-proofing property and a neutralization-preventing property that allow painting to be omitted via a mortar on the hanging surface of the concrete structure to be repaired. made fiber reinforced concrete lightweight panel a is repaired panel strength is stretched more side by side, the lower end portion of the repair panel, the along the lower end of the hanging surface, shielding salinisation and neutralized blocking property the chipping surface and the groove provided in the arranged panels guide integral with the mortar material said concrete structure having, housed through the joint filler having salt resistance and neutralized blocking property barrier cage, the hollow portion is generated between the end faces of the repair panel adjacent is the repair structure of the concrete structure, characterized in that joint filling material is filled with salt resistance and neutralized blocking property barrier .

  In one embodiment, a connecting member that receives an end portion of the other repair panel having an end face provided with a longitudinal groove is attached to an end portion of one of the adjacent repair panels, and the connecting member. And the vertical groove are filled with the joint filler having the salt-insulating property and neutralization-preventing property. An anchor bolt protrudes from the lower surface of the repair panel, and a positioning hole is formed in the groove. The anchor bolt is inserted into the positioning hole.

  The present invention is as described above, and the use of a repair panel having a light-blocking property and a salt-blocking property and a neutralization-preventing property that can omit the coating eliminates the need for maintenance of the portion. Can be done by placing the lower end in a groove provided in the panel guide laid along the lower end of the suspension surface, so that the construction is easy and the construction period can be shortened. There is an effect that sometimes the main line (lane) regulation is unnecessary.

  In addition, the vertical joints between the repair panels are treated by filling the hollow portions created between the end faces of the repair panels with joint fillers having salt-blocking properties and neutralization-preventing properties. It is possible to absorb the error of time and to prevent the deterioration factor from entering, and to make the vertical joint structure highly durable. Performing after filling with epoxy resin or other joint filler has the effect of providing a horizontal joint structure that can prevent the ingress of deterioration factors.

It is a partial cutaway perspective view for demonstrating the repair structure and repair method of a concrete structure using the repair panel which concerns on this invention. It is a longitudinal cross-sectional view which shows the repair structure of the concrete structure using the repair panel which concerns on this invention. It is a longitudinal cross-sectional view which shows the detail of the upper part of the repair structure of the concrete structure using the repair panel which concerns on this invention. It is a longitudinal cross-sectional view which shows the detail of the lower part of the repair structure of the concrete structure using the repair panel which concerns on this invention. It is a cross-sectional view which shows an example of the vertical joint processing method in the repair method of the concrete structure using the repair panel which concerns on this invention. It is a figure which shows the other example of the vertical joint processing method in the repair method of the concrete structure using the repair panel which concerns on this invention. It is a figure which shows the modification of the vertical joint processing method shown in FIG.

  A mode for carrying out the present invention will be described with reference to the accompanying drawings. The repair structure of a concrete structure according to the present invention has a salt-blocking property and a neutralization-preventing property that allow painting to be omitted via a mortar 14 (usually a grout mortar) on the suspension surface of the concrete structure 1 to be repaired. A plurality of repair panels 11 that are lightweight panels are stretched side by side, and the lower end of the repair panel 11 is in a groove 4 provided in the panel guide 3 made of mortar laid along the lower end of the suspension surface. The hollow part produced | generated between the end surfaces of the adjacent repair panel 11 is filled with the joint filler 17 which has salt-blocking property and neutralization prevention property, It is characterized by the above-mentioned.

  Further, the repair method of the concrete structure according to the present invention is a construction method for constructing the repair structure, and is roughly divided into a suspending process of a repaired part and a laying process of a panel guide for assisting the standing of the repair panel. And a restoration panel standing process, a mortar injection process into the gap between the repair surface and the repair panel, a vertical joint treatment process between the repair panels, and a top edge treatment process. Hereafter, it demonstrates in detail, referring an accompanying drawing for every process.

The repairing part is a hanging process. This process is a process in which the depth is appropriately hung from the vertical surface to the upper surface of the portion of the concrete structure 1 to be repaired before the restoration panel is set up. The lifting operation can be performed by a general method. As the concrete structure 1 to be repaired by the repairing method according to the present invention, a bridge wall rail, a side wall of a supervisor passage in a tunnel, or the like is assumed. The illustrated example relates to a bridge wall rail, but the same applies to the case of the side wall of the observer passage in the tunnel.

Panel guide laying process This process accepts the lower end of the repair panel 11 along the lower part of the portion of the concrete structure 1 to be repaired (the far end of the ground cover 2 in the case of a wall rail). For example, it is a step of laying a panel guide 3 made of mortar in which a groove 4 having a depth of about 5 mm is provided in the length direction. If a material with excellent salt shielding performance (the diffusion coefficient of chloride ions is about 0.024 cm ² / year or less) is used as the panel guide, the chloride ion concentration at the reinforcing bar position after 100 years with a cover thickness of 35 mm Can be made lower than the generation limit chloride ion concentration.

  By disposing the panel guide 3 along the lower part of the concrete structure 1 at the location to be repaired in this way, as will be described later, it becomes easy to set up and set the repair panel 11 later. The time error (gap between the vertical joints) can be reduced, so that it is possible to realize a horizontal joint structure at the lower end of the panel that can prevent deterioration factors from entering from the vertical joints.

Repair panel standing up process This process is a process of dropping a large number of repair panels 11 and dropping their lower ends into the grooves 4 of the panel guide 3 and standing side by side. The concrete used in the restoration panel upsetting method described in Patent Document 1 is a fiber reinforced concrete having a compressive strength of about 40 N / mm ² , and the thickness of the restoration panel used in that case is 30 mm. In addition, it has been intended to resist lateral pressure during filling of grout mortar by disposing grid-like reinforcing bars and screw rods inside the panel to increase panel strength.

  On the other hand, the repair panel 11 used in the present invention is an ultra-high-strength fiber reinforced concrete shown in “Design and Construction Guidelines for Ultra-High Strength Fiber Reinforced Concrete (Draft)” (hereinafter referred to as UFC Guidelines), or UFC. It is manufactured using ultra-high-strength fiber reinforced concrete (mixed with non-ferrous fibers such as polypropylene) equivalent to the various physical properties (air permeability coefficient, chloride ion diffusion coefficient) indicated in the guidelines. is there. Since the repair panel 11 according to the present invention is made of such fiber reinforced concrete, the thickness thereof can be reduced to 2/3 of the conventional 20 mm, and the weight can be significantly reduced. . Further, since the repair panel 11 has a salt barrier property and a neutralization inhibiting property, it is possible to omit surface protection treatment such as painting.

  Installation of the repair panel 11 in the groove 4 is performed after the panel guide 3 is cured after filling the groove 4 with a joint filler 5 having a salt-blocking property and a neutralization-preventing property. In this way, by fixing the lower part of the repair panel 11 that is accommodated in the groove 4 with the joint filler 5, it is possible to prevent the deterioration factor from entering from the horizontal joint part below the repair panel 11. Further, by finishing the panel guide 3 using a ruler, a groove forming jig or the like, it becomes easy to ensure construction accuracy and improve construction ability.

  Moreover, in one embodiment, the anchor bolt 13 protrudes from the lower surface of the repair panel 11, passes through the inner bottom surface of the groove 4, is placed on the ground cover 2, and is provided with a positioning hole into which the anchor bolt 13 is inserted. In this case, when the repair panel 11 stands, it is easy to correctly position the repair panel 11 in the groove 4 by inserting the anchor bolts 13 into the positioning holes. Note that the joint filler 5 supplied into the groove 4 also flows into the positioning hole.

  After the lower end portion of the repair panel 11 is disposed in the groove 4 as described above, the upper portion of the repair panel 11 is fixed to the upper portion of the concrete structure 1. The fixing is performed using, for example, an L-shaped bracket 21. That is, the vertical surface of the L-shaped bracket 21 is fixed to the upper side surface of the repair panel 11, and the horizontal surface of the L-shaped bracket 21 is fixed to the upper surface of the concrete structure 1 (see FIGS. 2 and 3).

Mortar Injecting Step This step is a step of injecting and filling mortar 14 into the gap existing between the repair panel 11 arranged in a plurality of sides as described above and the suspension surface of the concrete structure 1.

Longitudinal joint treatment process between repair panels In this process, after the above mortar injection process, the vertical joint 12 is treated by preventing the deterioration factor from entering the longitudinal joints 12 between the repair panels 11. It is. When the repair panel 11 stands, it is inevitable that a stand-up error occurs, and a gap is inevitably formed in the vertical joint 12 portion. Therefore, it is necessary to have a configuration that can absorb this standing-up error and prevent the deterioration factor from entering through the gap. There are two types of configurations for that purpose. The first type A shown in FIG. 5 can deal with a case where the standing error is about several millimeters or less, and the second type B shown in FIGS. 6 and 7 has a few standing errors. It can handle up to about 10 mm.

  In the case of Type A, vertical grooves 15 extending in the vertical direction are formed on the opposing end faces of the repair panels 11 that are laid side by side, and the back side of the opposing end faces of one or both of the repair panels 11 to be abutted. The seal sponge 16 is fixed to the edge. The seal sponge 16 is compressed when standing to absorb the standing error between the panels 11, and when the mortar (usually, grout mortar) 14 is injected, the mortar 14 is moved from the vertical joint 12 to the surface side. It plays a role of preventing leakage into the water (see FIG. 5B). In this case, it is preferable to provide the longitudinal groove 15 in both of the adjacent repair panels 11 and 11, but it may be provided only on one side.

  Further, in this type A, after the restoration panel 11 stands up, the surface side gap of the restoration panel 11 is closed with a sealing material 18 such as mortar, and then the longitudinal grooves 15 on the end surfaces of both of the restoration panels 11 that are abutted with each other. A joint portion 17 having a salt-blocking property and a neutralization-preventing property is filled in a space portion having a circular or elliptical cross section formed by combining them. When a highly fluid filler such as an epoxy resin filler is used as the joint filler 17, the filling is performed by using an injection jig (steel hollow rod having an outer diameter of about 5 mm) at the tip of the injection vinyl hose. Can be carried out using an injection tool equipped with In this way, by injecting the joint filler 17 having a salt-blocking property and a neutralization-preventing property into the vertical joint 12 portion, the vertical joint 12 is completely blocked, so that the deterioration factor enters the inside. Can be reliably prevented.

  In the case of Type B shown in FIGS. 6 and 7, a connecting member 22 formed by combining two metal members 23 and 24 such as stainless steel plates bent into a crank shape is used. The end face of the repair panel 11 is kept flat, and a semicircular or other suitably shaped vertical groove 15 is formed on the end face of the other repair panel 11 opposite to the end face.

  Then, the joint portions 25 of the metal members 23 and 24 are embedded in advance in the flat end surface of the one repair panel 11. The joint portion 25 can be embedded by setting concrete in a formwork in advance when the repair panel 11 is manufactured. In that case, it is preferable that a large number of openings 26 are provided in the joint portion 25 so that the uncured concrete enters the openings 26 with the embedding (see FIG. 6). In that case, since concrete hardens over the opening 26, the joint portion 25 is reliably prevented from coming off.

  In the case of this type B, the connecting material 22 is attached only to one of the adjacent repair panels 11. In this case, after the repair panel 11 to which the connecting material 22 is attached is first installed on the panel guide 3, the edge of the other repair panel 11 having the longitudinal groove 15 formed on the end surface is connected to the opening of the connecting material 22 from above or from above. Push in from the side. As a result, a space extending in the vertical direction is generated between the connecting material 22 and the vertical groove 15, and the joint filler 17 is injected and filled therein. The size of the space generated between the connecting material 22 and the vertical groove 15 depends on the standing error of the repair panel 11.

  Moreover, in the case of the example shown in FIG. 7, it differs from the case of the example shown in FIG. 6 in that the joint portion 25 of the metal members 23 and 24 is bolted. When the portion 28 is locked, the joint portion 25 is prevented from coming off. Also in this example, the joint filler 17 is injected and filled into the space generated between the connecting material 22 and the longitudinal groove 15 as in the above example.

  In any of the types A and B, the connecting material 22 such as the sealing material 18 and the stainless steel plate prevents deterioration of the filled joint filler 17 due to ultraviolet rays or the like. It can be secured.

  As described above, in the case of Type A, a flexible seal sponge 16 is attached to the repair panel 11 in advance, and the seal sponge 16 is compressed when the repair panel 11 stands up, so that the repair panel 11 and the concrete structure 1 are compressed. The leakage of the mortar 14 filled in the gap between them is prevented, and the error between the repair panels 11 is absorbed. In the case of Type B, the connecting material 22 prevents the mortar 14 from leaking, and the space portion that is generated between the connecting material 22 and the longitudinal groove 15 and is filled with the joint filler 17 Incorporation error is absorbed.

The top edge of the concrete structure 1 is partly or entirely removed (partly in the illustrated example). In either case, after the mortar injection process is finished, the ceiling of the concrete structure 1 is removed. A salt-blocking epoxy resin or other resin coating is applied to the end surface, and the top end is processed so as to cover the repair panel 11 from the top end surface with the mortar 14a. The mortar 14a used in this case is also a grout mortar having excellent salt shielding performance as described above. Thereby, the entrance of water to the interface between the repair panel 11 and the mortar 14 can be prevented, and corrosion of the reinforcing bars caused by the entrance of deterioration factors such as chloride ions to the mortar 14 can be prevented. In the case of partial repair as in the illustrated example, a joint is formed at the top, so it is preferable to cover the cover 27 for concealing this portion.

  Although the invention has been described in some detail in its most preferred embodiments, it will be appreciated that a wide variety of embodiments can be constructed without departing from the spirit and scope of the invention. Accordingly, the invention is not limited to that particular embodiment, except as limited in the appended claims.

DESCRIPTION OF SYMBOLS 1 Concrete structure 2 Ground cover 3 Panel guide 4 Groove 5, 17 Joint filler 11 Restoration panel 12 Long joint 13 Anchor bolt 14, 14a Mortar 15 Vertical groove 16 Seal sponge 17 Joint filler 18 Seal material 21 L-shaped metal fitting 22 Connection Material 23, 24 Metal member 25 Joint part 26 Opening 27 Cover 28 Bolt fastening part

Claims (10)

A process of picking up the parts to be repaired in the concrete structure to be repaired,
Panel guide laying with a mortar material so as to be integrated with the suspension surface of the concrete structure along the lower portion of the suspension surface of the concrete structure, with a groove guide for receiving the lower end of the repair panel. Process,
A plurality of the repair panels, a repair panel standing up step of dropping the lower end portion into the groove of the panel guide and standing side by side;
A mortar injecting step of injecting mortar into the gap between the upright restoration panel and the suspension surface of the concrete structure;
A vertical joint treatment process for preventing the entry of deterioration factors into the vertical joint between the repair panels that have stood up,
The top end processing step of processing the top end of the concrete structure and the repair panel,
The restoration panel is made of ultra-high-strength fiber reinforced concrete, and the standing of the panel guide in the standing step into the groove has a salt-blocking property and a neutralization preventing property in the groove. A method for repairing a concrete structure, which is performed after filling with a filler .   The method for repairing a concrete structure according to claim 1, wherein the repair panel is a lightweight panel having a salt-blocking property and a neutralization-preventing property that can be omitted from painting. An anchor bolt protrudes from the lower surface of the repair panel and a positioning hole is drilled in the groove. When the repair panel stands in the groove in the repair panel standing step, the anchor bolt is inserted into the positioning hole. The repair method of the concrete structure of Claim 1 or 2 inserted in. In the longitudinal joint process step, the hollow portion is generated between the end faces of the repair panel adjacent, filling the joint filler having a salt resistance and neutralized blocking resistance barrier, to any one of claims 1 to 3 Repair method of concrete structure of description. A connecting material for receiving the end of the other repair panel having a longitudinal groove on the end face is attached to an end of one of the adjacent repair panels, and is generated between the connecting material and the longitudinal groove. The method for repairing a concrete structure according to claim 4 , wherein the hollow portion is filled with a joint filler having the salt-insulating property and the neutralization-preventing property. The method for repairing a concrete structure according to any one of claims 1 to 5 , wherein an upper part of the repair panel and an upper part of the concrete structure are connected to each other via a connecting metal prior to the mortar pouring step. The concrete structure according to any one of claims 1 to 6 , wherein the treatment of the top end portion is performed by applying an epoxy resin-based resin coating or the like to a suspended portion of the top end portion and coating the top with a mortar. How to repair things. Multiple repair panels, which are lightweight panels made of ultra-high-strength, fiber-reinforced concrete , with salt-blocking and neutralization-preventing properties that can be omitted, are applied sideways and stretched through mortar on the suspension surface of the concrete structure to be repaired. Established,
The lower end of the repair panel, the along the lower end of the hanging surface, the panel disposed in chipping surface integral of the concrete structure using a mortar material with a salt resistance and neutralized blocking property barrier Guide in the groove provided in, and housed through a joint filler having salt resistance and neutralized blocking resistance barrier, the hollow portion is generated between the end faces of the repair panel adjacent barrier saline and medium A structure for repairing a concrete structure, characterized by being filled with a joint filler having an anti-oxidation property. A connecting material for receiving the end of the other repair panel having a longitudinal groove on the end surface is attached to an end of one of the adjacent repair panels, and the connection material and the longitudinal groove The repair structure for a concrete structure according to claim 8 , wherein a hollow portion formed therebetween is filled with a joint filler having the salt-insulating property and neutralization-preventing property. The concrete structure according to claim 8 or 9 , wherein an anchor bolt protrudes from a lower surface of the repair panel, a positioning hole is formed in the groove, and the anchor bolt is inserted into the positioning hole. Repair structure of things.

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