JPH09324408A - Underwater construction method for piers, etc. - Google Patents

Abstract

(57) [Abstract] [Subject] In the method of reinforcing the pier in water, reduce the temporary materials and reduce the weight to reduce the transportation cost and the loading and unloading labor, and remove the panels after curing by integrally mounting them. The purpose is to eliminate the need for work, shorten the construction period, increase the strength of the bridge pier, and reinforce the reinforcing bars to increase the strength, similar to the conventional construction method. An anchor bolt 2 is driven into a pier 1, and a rod 3 is fixed to the anchor bolt 2 by welding. The non-woven sheet 8 is inserted and attached to the end of the rod, sandwiched between packing washers 7 and fixed with nuts 6 and lock nuts 9.
A panel made of the non-woven sheet 8 is attached around the.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater method for repairing or reinforcing underwater a bridge pier, a river, a seawall, etc. (hereinafter simply referred to as "pier, etc.") or a new construction.

[0002]

2. Description of the Related Art Conventionally, as a method of repairing or reinforcing a pier in water, the surface of the pier has been polished with a brush or sandplast, then anchor bolts are driven at regular intervals, and then rebars are assembled and panels are attached to the pier. A method of driving concrete between is known.

Similarly, when a pier is newly constructed, a method is known in which after arranging the riverbed or the seabed, a panel is attached around it and concrete is poured between the panels. On the other hand, as a revetment construction method for rivers and coasts, a method of laying a nylon mat on the construction surface and then injecting concrete into the mat is known.

[0004]

In the above-mentioned conventional construction method using a panel, a large amount of temporary materials such as panels are required, and since these are heavy and bulky, the transportation cost is high, and it is considerably easy to load and unload. Requires a lot of effort. After curing, the panel will be removed, but this requires removal work in water.

In the conventional revetment construction method using a mat,
Reinforcing bars cannot be arranged in the mat, and a strong construction body cannot be obtained. INDUSTRIAL APPLICABILITY The present invention, in the underwater construction method for piers and the like performed by arranging reinforcing bars, reduces temporary materials and reduces weight to reduce transportation costs and labor for loading and unloading. In addition to shortening the construction period, the strength of the pier can be increased by integrally placing the panels.

[0006]

The construction method of the present invention is a method for repairing or reinforcing an existing pier or the like underwater, which comprises a step of cleaning and polishing the surface of the pier or the like under the water, and an appropriate anchor bolt for the pier or the like. Steps of driving at intervals, steps of attaching reinforcing bars to anchor bolts protruding from bridge piers, etc., after attaching reinforcing bars, attaching resin sheet to anchor bolts and tensioning around piers, etc. , The process of driving concrete.

Another construction method is a construction method of newly constructing a pier or the like in water, which is a step of assembling a reinforcing bar on the riverbed or the seabed,
It consists of a step of tensioning a resin sheet around the reinforcing bars after assembling the reinforcing bars, and a step of driving concrete after tensioning the resin sheets. In each of the above construction methods, the resin sheet is usually stretched by connecting a plurality of sheets in the lateral direction, but it may be stretched by using one sheet.
In any case, it should be stretched around the piers or around the reinforcing bars, and in order to connect in a ring shape, the seat edges must be connected together at a small number in one place. To connect the sheet edges,
For example, a fastener may be used, or sheet ends may be overlapped and overlapped, and an anchor bolt may be passed through the overlapping portion.

The resin sheet used in each of the above-mentioned construction methods is preferably a non-woven fabric or woven fabric having water permeability. This is because concrete kneading water can be separated and discharged, and the water-cement ratio can be lowered, so that the hardening time can be shortened and high-strength, high-density piers and the like can be obtained. In each of the above-mentioned construction methods, if the construction surface of the resin sheet is curved or bent, it is necessary to make a notch in the hem so as to open in a V shape so as to bend or bend along the construction surface. . In this case, in order to prevent the concrete from flowing out from the V-shaped cut portion, it is desirable to apply a patch cloth to the cut portion from the back side.

In each of the above-mentioned construction methods, the hem of the resin sheet is pressed by the holding plate to prevent concrete from flowing out.
The holding plate preferably has a rising portion for reinforcing the lower end of the seat. If the construction surface is curved or bent, the hem of the holding plate is similarly cut.

[0010]

1 and 2 show a method of reinforcing an existing pier 1, in which the surface of the pier 1 is ground with sand plus, and then the foundation of the pier 1 and the surroundings of the pier 1 are shown. And anchor bolts 2 at regular intervals in the height direction
Type in. Next, a rod 3 having a thread at one end is connected by welding to an anchor bolt 2 projecting laterally from the pier 1, and a steel bar 4 is connected by welding to the anchor bolt 2 projecting upward from the base portion. Then, the wire 3 is connected to the rod 3 by binding the wire 5. After that, the nut 6 is attached to the end of the rod, and then the packing washer 7 is attached. Then, the non-woven fabric sheet 8 having a constant width and having holes for passing the anchor bolt 2 and the rod 3 is made vertically long, and the anchor bolt 2 and the rod 3 are provided in the respective holes. Pass through.

When the non-woven sheet 8 is bent in accordance with the shape of the bridge pier 1, a cut 12 is formed in the hem as shown in FIG. 3, and the cut 12 opens in a V shape. The patch cloth 13 is applied from the back side to the V-shaped cut portion. After passing the non-woven fabric sheet 8 through each rod 3, the set nut 9 is screwed in via the packing washer 7, and the non-woven fabric sheet 8 is sandwiched and fixed by both packing washers 7. As a result, the non-woven sheet as a panel is attached to the pier 1 with a certain space.

The non-woven fabric sheet 8 attached to the rods 3 having a constant height is bent outward from the end rods 3 and is hung down. The above-mentioned attachment of the nonwoven fabric sheet 8 is sequentially performed in the lateral direction so that the sheets 8 are continuous, and one round is made around the pier 1. The connection between the adjacent sheets 8 is performed by a fastener,
Alternatively, it is carried out by overlapping a part of them and passing the overlapped portion through the rod 3 and tightening it with a lock nut 9. In addition, the sheet protruding around the pier 1 once is cut out or overlapped.

Next, the hem of the nonwoven fabric sheet 8 is pressed by the pressing plate 11, and the lock nut 9 is screwed in to fix it. A notch is also made in the lower side of the holding plate 11 that holds the curved portion. After the panel made of the non-woven fabric sheet 8 is attached around the pier 1 as described above, concrete is poured in the same manner as before.

[0014]

The present invention is configured as described above and has the following effects. According to the underwater construction method according to claims 1 and 2, unlike the construction method using a conventional panel, a crosspiece, a pillar, a stud, etc. are not required, and temporary materials can be reduced, and the resin sheet is a conventional panel. Since it is not bulky and lighter than the above, the transportation cost and the labor of unloading are reduced, the noise during transportation, unloading and assembly is less than that of the conventional panel, and the safety of work is improved. Compared with the construction method using the conventional panel, after curing, there is no need to remove the resin sheet, and since it is integrally placed, the strength increases, the construction period can be shortened, and the cost can be reduced, etc. In addition, since the resin sheet is stretched at an appropriate distance from the construction surface, reinforcing bars can be arranged between the construction surface and the construction method, and a strong construction body can be obtained. it can.

When the resin sheet is a non-woven fabric or a woven fabric sheet as described in claim 3, since it has water permeability, concrete kneading water can be separated and the water-cement ratio can be lowered, so that the concrete is hardened. The time can be shortened and high strength and high density bridge piers can be obtained. According to the construction method of the fourth aspect, it is possible to deal with a curved or bent construction surface, and it is also possible to prevent concrete from flowing out by applying a patch cloth to the V-shaped notch.

If the bottom of the resin sheet is pressed by the pressing plate as in the method described in Claim Steel 5, concrete can be prevented from flowing out and the sheet can be reinforced.

[Brief description of drawings]

FIG. 1 is a view showing a construction method for reinforcing an existing bridge pier.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view of a hem portion.

[Explanation of symbols]

 1 ... Bridge pier 2 ... Anchor bolt 3 ... Rod 4 ... Steel bar 5 ... Wire 6 ... Nut 7 ... Packing washer 8 ... Nonwoven sheet 9 ... Lock nut 11 ... Press plate 12 ..Fabric

Claims (5)

[Claims] 1. A method for repairing or reinforcing a pier or the like in water, which comprises the steps of cleaning and polishing the surface of the pier or the like under the water, driving anchor bolts into the pier or the like at appropriate intervals, and A step of assembling the reinforcing bar to the protruding anchor bolt, and a step of attaching a resin sheet to the anchor bolt after assembling the reinforcing bar and stretching around the pier etc.
An underwater construction method that consists of the step of driving concrete after tensioning the resin sheet. 2. A method of constructing a pier or the like in water, which comprises a step of assembling a reinforcing bar to a riverbed or a seabed, and a step of tensioning a resin sheet around the reinforcing bar after the reinforcing bar is assembled.
An underwater construction method that consists of the step of driving concrete after tensioning the resin sheet. 3. The underwater method according to claim 1, wherein the resin sheet is a non-woven fabric or a woven fabric sheet. 4. The underwater according to any one of claims 1 to 3, wherein a cut is made in the hem of the resin sheet according to a curved or bent construction surface, and a patch is applied to the cut. Construction method. 5. The underwater method according to claim 1, wherein the hem portion of the resin sheet is held by a holding plate.