JPH0518120A - Repairing method for concrete skeleton - Google Patents

Abstract

PURPOSE:To perform repair in a short period at a low cost without reconstructing a building, constructing a new bridge, or temporarily supporting a bridge girder in the repairing method of a concrete bridge pier, the base of a large machine, or the other general concrete skeleton. CONSTITUTION:A repairing hole 9 is bored at the required repair position, multiple resin injection conduits 10, 11 are inserted into the inlet of the hole 9 while the rear end sections are protruded to the outside, the tip sections 10a, 11a of the resin injection conduits 10, 11 are located at the depth side of the hole 9, and the inlet 9a section of the hole 9 is sealed with grout 12. A repairing filler material is injected into the hole 9 with an injection device from one resin injection conduit 10. After the hole 9 is filled with the repairing filler material, the other resin injection conduit 11 used for an air vent is closed, the repairing filler material is further injected with high pressure into the hole 9 from the other resin injection conduit 10 to be infiltrated to fine sections of the position under repair.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing concrete piers, foundations for large machines, and other general concrete frames.

[0002]

2. Description of the Related Art Conventionally, a concrete skeleton, such as a concrete bridge, requires repair if it has been a long time since its construction or if it has a structural defect. This is because when constructing a concrete bridge pier, concrete is cast on site in multiple times, so the concrete splicing part is not completely integrated, and it is unavoidable that there is a peeling part. Then, a repeated load is applied and cracks are easily generated from the peeled portion.

That is, in a bridge that crosses a river like a railway bridge, the distance between the piers of the bridge standing in the river is short,
The ones standing on both ends of the river are long. Therefore, the bridge girder is constructed thin at the riverside and thick at both ends of the river. In the bridge piers supporting the bridge girders of different steps, the thick bridge girder is directly supported by the upper part of the pier and the thin bridge girder is supported by the concrete foundation added to the upper part of the pier. Therefore, peeling was observed at the striking joint of the concrete foundation that was added to the pier body, large vibration was generated by the passage of the train, the grout under the girder was damaged, the anchor bolt of the girder was loosened, and the inside of the pier body Cracks occur. Thus the bridge piers gradually weakened.

As a countermeasure, the following method has been adopted. That is, the temporary bridge is provided on the side of the bridge to be repaired, and the temporary bridge is detoured around the traffic route to repair the old bridge. As another method, as shown in FIG. 7, the bridge girder 1 is temporarily supported and then the damaged portion 4a of the foundation of the pier 4 is removed by a rock drill or the like, and reinforcing steel bars 7 are installed and new concrete is poured. Installed, after the required strength of the cast concrete is developed, repel the upper part of the pier foundation, place a grout under the girder seat 2, and remove the temporary support after the completion of repair work. is there.

[0005]

However, in the method of repairing the piers described above, constructing a temporary bridge requires a huge amount of cost and a long construction period. Further, in order to carry out temporary support, it is necessary to hit piles for temporary support, which also entails a huge cost and a long construction period. In addition, in the repair method by injecting the resin into the concrete crack, since the resin was injected from the surface of the concrete, there was a drawback that it did not sufficiently penetrate into the crack inside the concrete and the effect could not be expected so much. . For this reason, there were many cases where the bridge piers were left alone without being sufficiently repaired.

[0006] The present invention has been made in view of the above problems, and without constructing a temporary bridge or temporarily supporting a bridge girder,
An object of the present invention is to provide a method for repairing a concrete skeleton that can be performed in a short period of time and at low cost.

[0007]

Means for Solving the Problems The object of the present invention to solve the above problems and achieve the above objects is to repair a required repaired portion after leaving a portion necessary for supporting a structure, etc. Of the resin injection conduit, the rear end of the resin injection conduit is projected to the outside, and the resin injection conduit is inserted into the hole. The tip of the resin injection conduit is positioned on the inner side of the hole and the inlet of the hole. Is sealed with a grout, and a repair filling material is injected into the hole from one of the resin injection conduits by an injection device, and after the hole is filled with the repair filling material, it is used for bleeding. The other resin injection conduit used was closed, and then a repair filling material was further injected from one of the injection conduits into the hole under high pressure to penetrate the details of the repaired part and repelled. There is a repair method such as placing grout on the part.

Further, in the case of a method of repairing a concrete skeleton, in the case where a work space is narrow and a long hole is bored for repair, a core drill made long by successively adding joints is used to open the long hole for repair. Drill and drill a plurality of steel wires and provide an anchor plate at one end and a bolt at the other end to insert a bendable steel wire into the slot while bending it appropriately and inject multiple resins. Insert the conduit into the slot with its rear end protruding to the outside, and fix the steel wire anchor plate in the slot, then position the tip of the resin injection conduit at the back side of the slot and insert the slot into the slot. Of the resin injection conduit after sealing the inlet part of the with a grout and tightening the bolt of the steel wire protruding to the outside to tighten the steel wire of the steel wire. After injecting a repairing filler into the hole from the resin injecting conduit of No. 1 with the injecting device and filling the elongated hole with the repairing filler, the other resin injecting conduit used for air venting is closed and then A repairing method further comprises injecting a repairing filler into the hole under high pressure from one of the resin injecting conduits to penetrate the details of the repairing site.

Further, the repair filler is a mixture of an epoxy resin main agent and a curing agent, and the grout is a resin mortar comprising the epoxy resin main agent, a curing agent and an aggregate. It is preferable.

[0010]

The filler filled in the hole for repair is forcibly injected into the hole at a high pressure, so that it penetrates and is hardened in every corner of the concrete joint and the crack. Further, even when the working space is limited, for example, even when the distance between the pier and the bridge girder is small, it is possible to similarly perform sufficient repair by using the bendable steel wire.
If an epoxy resin is used as the repair filler or grout, it can be firmly bonded and cured.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic front view of a bridge pier and a bridge girder for implementing the repair method of the present invention. In the figure, reference numeral 1 is a bridge girder, 2 is a girder seat, 3 is a spliced concrete foundation, 4 is a bridge pier,
Reference numerals 5 indicate anchor bolts, respectively. When the embodiment of the method for repairing a concrete skeleton according to the present invention is applied to an anchor bolt of a girder seat of a concrete bridge pier, similarly when it is applied to a crack inside a concrete or a joint, a PC steel rod is used for concrete. When applied to a splice, the case where the space between the bridge girder and the pier is narrow is explained.

First, as shown in FIG. 2, in order to reinforce the anchor bolt 5 of the girder seat 2, a repair hole 9 reaching the anchor bolt 5 from the upper part of the concrete foundation 3 is provided with a rock drill (not shown). 2 resin injection conduits 1 made of copper pipe with a diameter of about 4 to 10 mm and bendable by hand.
0 and 11 are inserted from the inlet 9a of the hole 9. Then, the tip ends 10a, 11a of the resin injection conduits 10, 11 are positioned on the inner side 9b of the hole 9, and the inlet 9a of the hole 9 is sealed with a grout 12. This includes the inlet 9 in the hole 9.
Insert a padding 12a such as cotton into a place of about 10 to 30 cm from a, and further, a resin of a mixture of an aggregate such as silica sand (particle diameter of about 0.1 to 1.0 mm) and an epoxy resin (for example, Alhua Tech 110 manufactured by Al Hua Tech Industrial Co., Ltd.) The mortar is filled as the grout 12 so as not to enter the inside of the hole 9, and is cured and hermetically sealed.

Next, a repair filling material is injected from the resin injection conduit 10 into the hole 9 by an injection device. Here, the repair filler is a mixture of a liquid main material of an epoxy resin and curing (for example, manufactured by Alpha Tech 800 Alpha Industry). When the repair filling material is injected, the air in the hole 9 is removed from the resin injection conduit 11 to the outside.

After the hole 9 is filled with the repair filling material, the external exposed portion 11b of the other resin injection conduit 11 used for bleeding air is closed. For this purpose, the resin injection conduit 11 may be manually bent to be closed, or another tool may be used.

Thereafter, a repair filling material is further injected into the hole 9 at a high pressure from the one resin injection conduit 10 so as to permeate the anchor bolt 5 in detail. As a result, the slack portion between the anchor bolt 5 and the concrete foundation 3 is filled with the repair filler, which prevents the anchor bolt 5 from rusting and is firmly fixed by the strong adhesive performance of the epoxy resin.

Next, as shown in FIG.
Alternatively, when applying to the crack 13 and the splicing portion 14 inside 4, a repair hole 9 is drilled up to the crack 13 and the splicing portion 14, and the resin injection conduits 10, 1 are provided in the hole 9.
1 and the PC steel rod 15 for reinforcement are inserted. This PC steel rod 1
5 is entirely buried in the hole 9.

Then, the repair work is carried out in the same manner as described above, the repair filler is forcibly permeated into the crack 13 and the splicing portion 14 to reinforce it, and the PC steel bar 15 is firmly fixed, as if the reinforcing bar was added. It is reinforced more strongly as it was done.

Next, as shown in FIG. 4, when repairing the splicing joint 14 with, for example, concrete 3, 4, first, the repairing hole 9 is penetrated into the splicing joint 14 with a required length. Make a hole. Then, the washer grout allowance 18 is repelled by a rock crusher, and further, a repair filler is poured from the entrance of the hole 9 from the bottom of the hole 9 to just before the splicing portion 14. The resin injection conduits 10 and 11 and the total length are about 1.9 m and the diameter is 1
A PC steel rod 17 (for example, a deformed PC steel rod B type No. 1 manufactured by Sumitomo Electric Industries, Ltd.) in which a 9-32 mm steel rod is engraved with a thread groove at one end and an anchor plate 16 is provided at the other end Insert into hole 9. As shown, the screw portion of the PC steel rod 17 and the upper portions of the resin injection conduits 10 and 11 are the concrete foundation 3
It is projected from the surface.

The repair filling material is hardened so that the PC steel rod 17
After fixing the anchor plate 16 of the
A padding 12a of cotton or the like is put in a place of about -30 cm, and the grout 12 is set on the washer grout allowance 18 while preventing the grout 12 from entering the hole 9. Then cure and cure. As a result, the entrance of the hole 9 is sealed.

After this, the PC steel rod 17 is attached to the washer 19 of mild steel plate.
Then, the nut 20 is used to apply a reaction force to the hardened grout 12 of the grout allowance 18 to strongly tighten the grout 12 to tighten the steel rod. Then, as described above, the repairing filler is injected and further injected at a high pressure to penetrate into the splicing portion 14 for repairing.

When the distance between the bridge girder and the bridge pier is, for example, about 1 m, the PC steel rod 17 as described above cannot be used. In such a case, repair work is performed as follows. That is, as shown in FIGS. 5 to 6, first, a diamond core drill (not shown) is used to rotate the core drill blade 22 while replenishing the joints 21, 21 ... In a narrow working space to form the hole 9. As a substitute for the PC steel rod 17, a bendable steel wire 23 shown in FIG. 6 is used.

The steel wire 23 is formed by bundling a plurality of steel wires 24 each having a diameter of about 0.26 to 4.5 mm and twisting them. A bolt 25 is provided on one end side and an anchor plate 26 on the other end side. Is provided. This is bent and inserted into the perforated hole 9, and in the same manner as in the case of the PC steel rod 17, the repair filling material is injected at high pressure through the resin injection conduits 10 and 11, and cracks and hits are made. It repairs fragile parts of concrete bridge piers such as joints.

Although not shown, the grout 12 used in the repairing method of the present invention may be placed in the place where the girder is separated from the old grout or the old grout may be repaired, or the resin injection conduit may be used. Needless to say, a method of injecting resin using 10 and 11 can be adopted.

As described above, according to the repairing method of the present invention, since the epoxy resin-based mixed material is injected under high pressure into the details of the peeled portion such as cracks, the repairing purpose can be sufficiently achieved.

The repair method as described above is carried out by applying the resin between the girder seat and the grout, between the grout and the foundation concrete, the grout repair, high-pressure resin injection into the anchor bolt of the girder seat, the splice joint and the crack. When performed for high-pressure injection, it took about 13 days. By the way, the conventional method of constructing a temporary support foundation requires a construction period of about 28 days. Needless to say, the method for repairing a concrete skeleton according to the present invention can be applied to a foundation of a large machine, a foundation of a concrete structure, and a general concrete skeleton other than the above-described embodiment.

[0026]

As described above, according to the method of repairing a concrete skeleton of the present invention, a plurality of resin injections are performed by forming holes for repair after leaving a portion necessary for supporting a structure and repelling. The conduit is inserted into the hole with its rear end protruding to the outside, the tip of the resin injection conduit is located at the back side of the hole, and the inlet of the hole is sealed with a grout, A repair filler is injected from one of the resin injection conduits into the hole by an injector, and after the hole is filled with the repair filler, the other resin injection conduit is closed and then the resin injection conduit is filled. Since one of the above resin injection conduits is used to inject a repairing filler into the hole under high pressure to penetrate the details of the repaired part, it will not be troublesome and cost will be reduced without rebuilding the building or structure, For bridge piers, conventional repair work Becomes lower cost with reduced construction period enables repair work without interrupting temporary traffic as peeling parts such as cracks and strike joints are firmly reinforced.

Further, in the case of a method of repairing a concrete skeleton, when the working space is narrow and a long hole is bored for repairing, the drill portion of the core drill lengthened by sequentially adding joints is used for repairing. A plurality of holes are bored, a plurality of steel wires are twisted, an anchor plate is provided at one end thereof, and a bolt is provided at the other end thereof. After inserting the resin injection conduit into the elongated hole by projecting the rear end thereof to the outside, and fixing the anchor plate of the steel wire in the elongated hole, position the tip of the resin injection conduit at the inner side of the hole and Close the entrance of the long hole with grout,
After tightening the bolt of the steel wire protruding to the outside to tension the steel wire of the steel wire, in the same manner as above, the repair filler is injected into the hole under high pressure by the injection device to penetrate the details of the repaired part. Therefore, the repair work can be performed even in a small work place.

Since the repair filler is an epoxy resin, its adhesive performance is exhibited, and the grout to be placed is also a resin mortar of epoxy resin and aggregate, so the curing period is shortened and the construction period is shortened. At the same time, it becomes possible to improve the durability and make a firm repair.

[Brief description of drawings]

FIG. 1 is a front view of a pier to which a repair method of the present invention is applied.

FIG. 2 is a front view showing how the anchor bolt of the girder is reinforced.

FIG. 3 is a front view showing a manner of repairing a splice portion and a crack.

FIG. 4 is a front view showing a repairing method using a PC steel rod.

FIG. 5 is a front view showing how a blade of a diamond core drill is replenished with a joint.

FIG. 6 is a front view showing the structure of a steel wire.

FIG. 7 is a front view showing a conventional method of repairing a concrete bridge pier.

[Explanation of symbols]

1 bridge girder, 2 girder seat, 3 concrete foundation, 4 bridge piers, 5 anchor bolts, 7 reinforcing bars, 9 repair holes, 10 and 11 resin injection conduit, 10a and 11a resin injection conduit tip, 11b resin injection conduit Externally exposed part of the, 12 grout, 12a filling, 13 crack, 14 piecing joint, 15,17 PC steel rod, 16
Anchor plate, 21 joints, 22 core drill blades,
23 Steel wire.

Claims (4)

[Claims] 1. A method of repairing a concrete skeleton, comprising:
After the required repair points have been repelled leaving the parts necessary to support the structure, holes for repair are drilled, and a plurality of resin injection conduits are inserted into the holes with their rear ends protruding outside. ,
The tip of the resin injection conduit is located at the back side of the hole and the entrance of the hole is sealed with a grout, and a repair filler is injected into the hole from one of the resin injection conduits. After injecting with a device and filling the hole with the repair filling material, the other resin injection conduit used for bleeding is closed and then further repair filling is performed from one of the resin injection conduits of the resin injection conduit. A method for repairing a concrete skeleton, characterized in that a material is injected into the hole under high pressure to permeate the details of the repaired part, and a grout is placed in the repelled part. 2. In the method of repairing a concrete skeleton, when a work space is narrow and a long hole is bored for repair, a core drill is lengthened by sequentially adding joints to drill the long hole for repair. The steel wire is twisted and a anchor plate is provided at one end of the steel wire and a bolt is provided at the other end of the steel wire. Insert the conduit into the slot with its rear end protruding to the outside, and fix the steel wire anchor plate in the slot, then position the tip of the resin injection conduit at the back side of the slot and insert the slot into the slot. After sealing the inlet part of the with a grout and tightening the bolt of the steel wire protruding to the outside to tighten the steel wire of the steel wire, repair from one of the resin injection conduits After injecting a filling material into the hole with an injection device and filling the long hole with the repairing filling material, the other resin injection conduit used for bleeding is closed and then the one resin injection conduit is used. Furthermore, a method for repairing a concrete skeleton, characterized by injecting a repairing filler into the hole under high pressure so as to permeate through the details of the repaired part. 3. The method for repairing a concrete skeleton according to claim 1, wherein the repair filler is a mixture of an epoxy resin main component and a curing agent. 4. The method for repairing a concrete skeleton according to claim 1, wherein the grout is a resin mortar including an epoxy resin main component, a curing agent, and an aggregate.