Repair structure for revetment concrete

Abstract

To provide a repair structure of revetment concrete, in which each form can be adjusted in the lateral direction by simple improvement and which can be installed smoothly.SOLUTION: The repair structure for revetment concrete includes a plurality of anchor bolts (2) driven into a cellular block (1) of revetment concrete, a frame (3) to which the anchor bolts (2) are fixed, a plurality of bolt studs (5) provided on the frame (3), a corrosion-resistant form (6) fixed via holes (9) of the bolt studs (5) and covering a surface of the cellular block (1), and concrete (12) filled between the cellular block and the form. The hole (9) of the form is formed larger than the diameter of the bolt stud (5), a corrosion resistant lug member (10) extending vertically is provided at the side end of the form (6), and the adjacent form (6) is joined through the lug member (10) to correct the lateral displacement when the form is mounted.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a repair structure for concrete revetments installed in rivers and on coasts. [Background technology]

[0002] Concrete revetments are constructed on river banks and coasts to prevent landslides. If the ground is relatively solid, simply solidifying the bank with concrete is sufficient, but if the ground is weak, it is common to strengthen the revetment by sunk rows of large concrete caissons with embedded rebar. However, after several decades, water seeps into this type of revetment and the rebar inside the concrete begins to corrode, causing the concrete itself to deteriorate, making repairs necessary.

[0003] For this reason, there are cases where fluororesin is applied to the surface of the concrete beforehand, but applying it to an existing revetment is difficult as it requires a lot of underwater work, and its durability only lasts for a few years.There is also a repair method in which the revetment surface is covered with precast concrete, but this type is costly as it can reach a thickness of 1m, and in some cases it cannot be used in some revetment locations.

[0004] Furthermore, repairs have been considered in which the concrete surface is covered with corrosion-resistant formwork and concrete is then filled into the formwork (Japanese Patent Laid-Open No. 7-127133, Japanese Utility Model Laid-Open No. 6-63609), but in order to secure the formwork, a number of anchor bolts are driven into the concrete, and a metal frame with spacers and bolt studs is fixed between them, after which the formwork is attached and concrete is filled inside.

[0005] The concrete surface to be repaired is surveyed, and multiple forms of the required size are fabricated in advance in the factory, but when trying to connect and secure the forms at the actual construction site, the edges of the formwork do not fit snugly with the adjacent formwork, and sometimes gaps appear.Even if the bolt holes for securing the formwork are left uncut, there is a limit to the amount of error that can be made, so workers have to go to the trouble of cutting out part of the formwork or filling in the gaps with sealant. [Patent Document 1] Japanese Utility Model Application Publication No. 6-63609 [Patent Document 2] Japanese Patent Application Publication No. 7-127133 [Patent Document 3] Japanese Patent Application Laid-Open No. 2000-139201 [Patent Document 4] Japanese Patent Application Laid-Open No. 2001-172091 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above circumstances, and its object is to provide a revetment concrete repair structure that allows each formwork to be adjusted laterally with simple improvements and can be installed smoothly. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the repair structure of the present invention is a repair structure for revetment concrete consisting of multiple anchor bolts driven into the cellular blocks of the revetment concrete, a frame fixed to the anchor bolts, multiple bolt studs provided on the frame, a corrosion-resistant formwork fixed to the bolt studs through holes and covering the surface of the cellular blocks, and concrete filled between the cellular blocks and the formwork, in which the holes in the formwork are formed larger than the diameter of the bolt studs, and corrosion-resistant ear members extending vertically are provided at the side ends of the formwork, and adjacent formwork is joined via these ear members. [Effects of the Invention]

[0008] In the present invention, the ear members and large holes provided on the formwork allow the formwork to be adjusted laterally, and also have the effect of facilitating installation by fitting the adjacent formwork into the ear members. DETAILED DESCRIPTION OF THE INVENTION

[0009] Figure 1 is a plan view of a repair structure to which the present invention is applied, with a cellular block 1 made of revetment concrete at the top. Multiple anchor bolts 2 are driven into the cellular block 1, and a metal frame 3 is fixed to the anchor bolts 2 with nuts 4. The frame 3 is provided with multiple bolt studs 5, and formwork 6 is fixed to the bolt studs 5 with nuts 7 and washers 8. A lattice reinforcing bar 11 is placed between the frame 3 and the formwork 6 to reinforce the filled concrete.

[0010] As shown in Figures 2 and 3, the formwork 6 is made of corrosion-resistant FRP, and has multiple holes 9 for bolt studs on its surface, with the holes 9 being larger (so-called clearance holes) than the diameter of the bolt studs 5. In this embodiment, four formwork pieces 6 (some omitted) are connected horizontally to cover the cellular block 1, with the formwork pieces 6 at both ends having curved sides 6a and bottoms 6b, and the two central formwork pieces 6 having only bottoms.

[0011] An FRP ear member 10 extending vertically is riveted to the right side of the leftmost formwork 6, and as shown in Figures 4 and 5, the ear member 10 is elongated and L-shaped in cross section, with one side joined to the side of the formwork 6 and the lower, bent portion joined to the bottom of the formwork. As can be seen in Figure 1, the rightmost formwork 6 has an ear member 10 joined to the left side, and the right end is bent, making it symmetrical to the formwork 6 on the left.

[0012] Next, the construction sequence for the repair structure will be explained. First, the frame 3 is placed against the surface of the cellular block 1 of the revetment using a crane or the like (not shown) and temporarily fixed in place. Then, anchor bolts 2 are fastened to the corresponding positions of each hole in the frame 3 with nuts 4, and lattice steel bars 11 are placed on the front of the frame 3.

[0013] Next, the formwork 6 on the left end is lowered by a crane onto the front of the rebar 11, and the bolt studs 5 protruding from the frame 3 are fitted into the holes 9 in the formwork, and it is fixed in place with corrosion-resistant nuts 7 and washers 8. Holes 9 are just clearance holes, but are completely blocked by the washers 8.

[0014] Next, the adjacent formwork 6 is fitted into the ear member 10 of the left formwork as shown in Figure 5, and is installed one after the other while being positioned. Since the formwork's large hole 9 and ear member 10 allow for lateral adjustment, the formwork edge will not protrude or large gaps will not form. Even if a small gap does form, the ear members 10 will prevent water from entering or the poured concrete from leaking. In this embodiment, ear members 10 were only provided on the formworks at both ends, and the two intermediate formworks did not require ear members, so lateral errors could be adequately absorbed.

[0015] Finally, underwater non-segregating concrete 12 is poured into the injection port (not shown) at the bottom of the central formwork, and when this is complete, the injection port is closed and the concrete is allowed to harden. The concrete 12 inside the formwork is reinforced with frames 3 and lattice steel bars 11. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a plan view of a repair structure to which the present invention is applied; [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Explanation of symbols]

[0017] 1 Cellular Block 2 anchor bolts 3 frames 5 bolt studs 6 Buried formwork 9 Formwork holes 10 Ear member 12 Filled concrete

Claims

[Claim 1] A revetment concrete repair structure comprising a plurality of anchor bolts (2) driven into a cellular block (1) of revetment concrete, a frame (3) fixed to the anchor bolts (2), a plurality of bolt studs (5) provided on the frame (3), a corrosion-resistant formwork (6) fixed to the bolt studs (5) via holes (9) and covering the surface of the cellular block (1), and concrete (12) filled between the cellular block (1) and the formwork (6), characterized in that the holes (9) in the formwork are formed larger in diameter than the bolt studs (5), corrosion-resistant ear members (10) extending vertically are provided at the side ends of the formwork (6), and adjacent formwork (6) is joined via these ear members (10).

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