JP4084256B2 - Repair structure of concrete channel - Google Patents

Description

  The present invention relates to a structure for reinforcing a concrete channel such as an irrigation channel for paddy fields, and more particularly to a technique for reinforcing an existing concrete side wall using a reinforcing plate.

  As shown in FIG. 5, a concrete water channel such as an irrigation water channel is dug down from the general ground G to form a water channel 1, and the side wall 2 and the bottom surface 3 of the water channel 1 are covered with a concrete.

  Since the useful life of concrete structures is generally 40 to 60 years, the depreciation period of concrete waterways in the country and local governments is also planned to be 40 years.

  However, in the case of the so-called deep water irrigation shown in FIG. 5 (structure in which the water channel 1 is located below the ground G), the backside earth and sand 5 around the concrete water channel contains a large amount of water. The concrete is exposed to harsh environments. This is because the paddy water intrudes into the surrounding earth and sand (5), and the water channel 1 is often formed at the edge of the mountain where there is a lot of moisture even at a location away from the paddy field.

  Of course, such circumstances around the water have been taken into consideration from the beginning of the design of the concrete channel, and a large amount of sand is put into the backside earth and sand 5 in order to improve drainage. However, after 30 to 40 years have passed, aging deterioration in which the sand is integrated and solidified with the soil grains is observed. When this happens, the concrete on the side walls 2 and the bottom surface 3 gradually becomes a concrete composition before the scheduled depreciation period, as a result of constantly being exposed to water by a large amount of water contained in the water channel 1 and the surrounding earth and sand 5. Undesirably changes.

  Even if the concrete composition changes, if the drainage of the backside earth and sand 5 is good, the water channel 1 can maintain the durability as originally planned. However, in reality, since the sand is hardened and the backside earth and sand 5 often contains a large amount of water, the water in the backside earth and sand 5 is especially affected when heavy rain falls from the beginning of autumn to the beginning of spring when the water volume of the waterway 1 decreases. Presses the concrete on the side wall 2 and the bottom surface 3 from the back surface, and in some cases, the side wall 2 is collapsed or the bottom surface 3 is pushed up to be damaged.

  In order to prevent such a situation, conventionally, various techniques for repairing a concrete water channel have been proposed. There are two ways of thinking in this case. One is to efficiently remove the water of the backside earth and sand 5, and the second is to reinforce the surface of the side wall 2 that is severely damaged, such as cracks on the surface. The former is generally performed by providing a pressure regulating valve (so-called weep hole) for draining water on the side wall 2. In the latter, a reinforcing material such as a concrete plate is provided on the surface of the side wall 2. The present invention is the latter type of repair structure.

  As a technique for providing a reinforcing plate on the surface of the side wall 2, there is, for example, JP-A-2002-021056. For example, as shown in FIG. 6, the reinforcing plate 6 having a predetermined rigidity is fixed to the surface of the side wall 2 formed of concrete by bolts, and the adjacent reinforcing plates 6 are connected to each other by bolts. The joint material 8 is filled in to secure the water tightness of the reinforcing surface. In addition, 7 is a recessed part which arrange | positions a volt | bolt.

  By the way, in such a conventional repair structure, generally, a plurality of reinforcing plates 6 arranged on the surface of the side wall 2 are provided on the top, bottom, left and right.

  In the left-right direction, since a construction section requiring repair is not constant, a large number of reinforcing plates 6 are inevitably required. However, generally, a large number of reinforcing plates 6 are also arranged in the vertical direction due to fine unevenness and angular deformation. This is because the reinforcing plate 6 is brought into close contact with the existing side wall surface (2) with as little gap as possible. Further, by reducing the area of the reinforcing plate 6, it is possible to minimize the deviation between the adjacent reinforcing plates 6.

However, if the area of the reinforcing plate 6 is reduced, the number of fixing points increases, so that the repair work cannot be quickly performed. As a result, the total area of the joints increases, resulting in watertightness such as joint cracks due to earthquakes and deterioration. There is a problem of increasing concern.
JP 2002-021056 A

  An object of the present invention is to speed up installation work and reduce the area of joints per unit area by using as large a reinforcing plate as possible.

  In order to achieve the object, the concrete water channel repair structure according to the present invention is provided with an advancing and retreating anchor capable of adjusting the height on the side wall of the concrete water channel, and supporting the reinforcing plate via the advancing and retreating anchor. 1).

  The height adjustment here is adjustment of the separation distance between the reinforcing plate 10 supported by the advance / retreat anchor 20 and the channel side wall. By adjusting the height of the forward / backward anchor (for example, adjusting the nut position), the position of the reinforcing plate supported by the forward / backward anchor, that is, the separation distance between the back surface of the reinforcing plate and the existing concrete side wall changes. For this reason, even if the existing concrete side wall is uneven or distorted due to deterioration, the reinforcing plate can be arranged at a preferred position without being affected by the distortion or unevenness, and the positional displacement between adjacent reinforcing plates can be reduced. (Surface difference) can also be eliminated. As a result, even if the area of the reinforcing plate is increased, there is no problem, and at least the size of the reinforcing plate can be increased from the bottom surface of the water channel to the top end or above the top end. The size of the reinforcing plate described in claims 4 and 5 is based on such a principle. The rigidity of the reinforcing plate can be increased by increasing the size of the reinforcing plate.

Reciprocating anchor comprises at least two nuts in the vicinity of the tip of the predetermined length of the bolt, Ru comprises a base for positioning between the two nuts.

  The advancing / retreating anchor supports a large reinforcing plate, and therefore needs to withstand a large load. Most preferably, a bolt and a nut having a predetermined diameter are used to achieve both height adjustment and load resistance. If a pedestal for positioning is arranged between two nuts arranged at the tip of the bolt, the position of the reinforcing plate can be freely changed by changing the position of the nut. In addition, the position of the reinforcing plate can be easily adjusted by adjusting the position of the nut after construction. There is no need for a structure in which the bolt itself moves.

  According to the concrete water channel repair structure of the present invention, it is possible to adjust the position of the reinforcing plate. By using a large reinforcing plate, the installation work can be quickly performed and joints per unit area can be reduced. .

  1 to 3 illustrate an embodiment of a concrete water channel repair structure according to the present invention. In the present invention, the side wall 2 of the water channel 1 is covered with the reinforcing plate 10 having sufficient rigidity, and at that time, the four corners of the reinforcing plate 10 can be freely adjusted. Reference numeral G is a general ground surface, and 3 is a bottom surface of the water channel 1.

  For this reason, in the vicinity of the four corners of the reinforcing plate 10, advance / retreat anchors 20 capable of height adjustment are arranged. By adjusting the position of the advance / retreat anchor 20, the four corners of the reinforcing plate 10 can be fixed independently from the side walls 2 of the water channel 1 at free positions, as indicated by reference numerals X 1 and X 2 in FIG.

  As shown in FIG. 3, the advancing / retracting anchor 20 is positioned, for example, between a bolt 21 having a predetermined length, two nuts 22, 23 arranged at the tip of the bolt 21, and the two nuts 22, 23. The pedestal 25 is used. 26 is a packing made of rubber or the like disposed so as to contact the pedestal 25, and 27 is a washer disposed between the packing 26 and the nuts 22 and 23. The packing 26 is not limited to rubber, and an appropriate rust-resistant material can be used. The presence or absence of elasticity does not matter.

  The pedestal 25 includes, for example, a channel material having a substantially U-shaped cross section, and a hole through which the bolt 21 is inserted in the bottom surface 25-2. The bolt 21 can change the position of the reinforcing plate 10 (separation distance from the side surface 2) according to the positions of the nuts 22 and 23 arranged on the front and rear sides of the bottom surface 25-2 of the base 25.

  In FIG. 1 to FIG. 3, a portion indicated by a symbol S is a gap that may be generated between the side wall 2 of the water channel 1 and the back surface 10 </ b> R of the reinforcing plate 10. The size of the gap may vary depending on the shape of the side wall 2 of the water channel 1 and the positional relationship between adjacent reinforcing plates. In some cases, the back surface 10R of the reinforcing plate 10 may be in contact with the side wall 2 of the water channel 1 so that no gap S is generated. In order not to generate the gap S, a recess for accommodating the nut 23 may be formed in advance on the side wall 2 or the back side of the reinforcing plate.

  Although the length of the bolt 21 is arbitrary, it is usually desirable to align it with a certain length. When the forward / backward anchor 20 is disposed on the side wall 2 of the water channel 1, an anchor hole is drilled in the side wall 2 using an appropriate tool, and the rear end of the bolt 21 is inserted.

  It is desirable that the depth of the hole for the anchor having the bottom is made substantially constant. If the depths of the holes are made uniform and the lengths of the bolts 21 are made uniform, the positions of the nuts 22 and 23 can be determined in advance without error according to the shape of the side wall 2 and the like when the reinforcing plate 10 is installed. Because. Pre-positioning of the nuts 22 and 23 requires a high level of proficiency, but even a person with little experience can position the nuts 22 and 23 with a certain tolerance, so workability is good.

  Therefore, according to the repair structure of the concrete water channel, the separation distance between the side wall 2 of the water channel 1 and the back surface 10R of the reinforcing plate 10 is adjusted by adjusting the height of the advancing and retracting anchor 20 by adjusting the position of the nuts 22 and 23. It can be freely adjusted independently at the four corners of the reinforcing plate 10.

  As a result, the reinforcing plate 10 can reinforce the water channel 1 by taking the most preferable position in relation to the shape change of the side wall 2 and the relationship with the adjacent reinforcing plate (10). Depending on the unevenness of the side wall 2 and the inclination angle of the adjacent reinforcing plate (10), it may be difficult to maintain the watertightness of the repair by the conventional method. However, according to the repair structure according to the present invention, For example, it is possible to maintain high water tightness both in relation to the side wall 2 of the water channel 1 and in relation to the adjacent reinforcing plate (10).

  In addition, the repair structure of the concrete waterway which concerns on this invention is not limited to the said structure. For example, in order to protect the side wall 2 from the influence of a severe negative outside air temperature in winter, a gap S having a predetermined width can be provided between the side wall 2 and the reinforcing plate 10 and an appropriate filler can be injected into the gap S. For example, injection of grout material, a structure in which concrete is placed with reinforcing bars, injection of resin-based foam material, and the like. In order to inject a grout material or a resin-based foam material, an injection port may be formed in advance at an appropriate location of the reinforcing plate 10.

  By injecting the filler into the gap S, the surface of the side wall 2 is not exposed to cold air, and the state before repair can be maintained for a long time. In this case, if the gap S is about 5 cm, for example, the heat insulation effect (outside air blocking performance) can be improved. Moreover, since the back surface 10R of the reinforcing plate 10 is supported from the back by injecting the filler, it is possible to suppress the slack and displacement of the advance / retreat anchor 20. In the case of injecting a resin-based foam material and when no filler is used, water from the backside earth and sand may flow into the gap S through cracks or gaps in the side wall 2, so that water is drained into the side wall 2. It is desirable to arrange the tube.

  As the material of the reinforcing plate 10, for example, concrete, FRP, various high-strength resins, resin concrete, or the like is selected and used. It is desirable to arrange reinforcing bars inside. The thickness of the reinforcing plate is determined according to the depth of the water channel and the amount of water, but for a normal water channel, for example, 5 cm is used as a reference. The reinforcing plate 10 may be designed so that the upper end is located above the top end of the water channel 1. This is because the amount of water for deep water irrigation can be increased without large-scale civil engineering work.

  The forward / backward anchors 20 for positioning the reinforcing plate 10 are provided at least at the four corners (including the vicinity) of the reinforcing plate 10. When the reinforcing plate 10 is made larger, four or more advance / retreat anchors 20 may be provided for load distribution.

  For example, resin or metal is used for the bolt 21. The outer diameter and length are set according to the size of the reinforcing plate 10 and the number of advance / retreat anchors 20 installed. In the case of a standard, an outer diameter of 16 mm and a length of about 120 to 125 mm are used.

  The bottom surface 25-2 of the pedestal 25 is not necessarily aligned with the back surface 10R of the reinforcing plate 10 as shown in FIG. A concave portion for installing the advance / retreat anchor 20 may be formed in the reinforcing plate 10 and an appropriately shaped base (25) may be provided. The shape of the pedestal is not limited to a member having a substantially U-shaped cross section. For example, as shown in FIG. 4, a spacer 40, which has an inverted U-shaped cross section, is arranged on the bottom surface 25-2 of the pedestal 25 having a substantially U-shaped cross section (front surface). , 23 may be positioned. In this structure, it is desirable that the nut 23 and the washer 27 are integrated by appropriate means, for example, welding or adhesion, and the washer 27 rotates in the same direction when the nut 23 is rotated. This is because the height of the reinforcing plate 10 can be adjusted simply by turning the nut 23.

  It is desirable that adjacent reinforcing plates (10) do not communicate with each other. Since the reinforcing plate 10 according to the present invention is often a large plate that reaches the top from the bottom, each reinforcing plate 10 is less susceptible to rolls / pitches during an earthquake when not connected sideways. Because it becomes.

  The reinforcing plate 10 is not necessarily a rectangular parallelepiped. This is because, in order to support a large load at the lower end, for example, the lower end portion may be designed to be curved.

  In the above description, the advancing / retracting anchor (20) has been described as adjusting the position of the reinforcing plate (10) by adjusting the position of the nut (22, 23), but the bolt (21) can be adjusted by adjusting the nut (22, 23). It is possible to adopt a structure that can move in the front-rear direction. Even in that case, the reinforcing plate (10) is supported by the nuts (22, 23) or appropriate support means. In the description of FIG. 4, it has been described that the nut 23 and the washer 27 are integrated. However, the position of the reinforcing plate 10 can be adjusted even if the nut 23 and the washer 27 are not integrated.

It is a figure which illustrates the external appearance of the reinforcement board which concerns on embodiment. It is a figure which illustrates the positional relationship of the reinforcement board which concerns on embodiment, and the side wall of a waterway. It is a figure which illustrates the 1st advance / retreat anchor which concerns on embodiment. It is a figure which illustrates the 2nd advance / retreat anchor which concerns on embodiment. It is a figure which illustrates the concrete channel for deep water irrigation. It is a figure which shows the repair method of the conventional concrete water channel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waterway 2 Side wall 3 Bottom surface 10 Reinforcement plate 10R (Reinforcement plate) Back surface 20 Advance / Retreat anchor 21 Bolt 22, 23 Nut 25 Base 26 Packing 27 Washer 25-2 Bottom surface (base) 40 Spacer (base)
G General ground S Clearance X1, X2 Reinforcement plate adjustment direction

Claims (1)

A concrete water channel repair structure in which an advancing and retracting anchor capable of height adjustment is arranged on the side wall of the concrete water channel, and a reinforcing plate is supported via the advancing and retracting anchor ,
The advance / retreat anchor comprises at least two nuts in the vicinity of the tip of a bolt of a predetermined length, and a positioning base having a substantially U-shaped cross section between the two nuts.
While integrating the nut and washer placed on the back side of the reinforcing plate, the washer is brought into contact with the back side of the reinforcing plate,
A spacer that has a reverse U-shaped cross section is arranged on the bottom of the pedestal having a substantially U-shaped cross section,
A concrete water channel repair structure in which a nut on the front side of a reinforcing plate is positioned through the spacer .

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