JP6904542B2 - Circular waterway repair method - Google Patents

Description

The present invention relates to a method for repairing a circular waterway, and a precast block, a frame, and a hanging member for use in the method for repairing a circular waterway.

Since 1970, circular waterways have been installed for the purpose of collecting and draining rainwater from expressways, etc., but many of them have been constructed for more than 30 years and have become significantly deteriorated. Due to aging, the main factors are repeated running load by the vehicle and deterioration of concrete, and especially water that opens as a drainage channel on the surface side of the circular channel (entrance to the circular channel) and has weak strength. Defects such as cracks and depressions have occurred mainly around the swallowing mouth. In addition, various defects such as defects due to land subsidence have occurred.

As a countermeasure, replace it with a new circular channel, remove the defective circular channel part, replace only that part with a new circular channel, or reinforce and repair only the defective surface side without replacing it. Is going. However, in order to replace the circular channel, it is necessary to destroy and remove the existing circular channel and install a new precast circular channel at the site. In addition, when repairing only the reinforcement on the surface side without replacing the circular waterway, a steel lid made of a thick iron plate provided with a drainage port (water inlet to the circular waterway) is attached to the surface side where the defect has occurred. The construction was the main one. The steel lid is attached by driving the steel lid into the concrete layer of the circular waterway with an anchor and fixing it. On the other hand, as in Patent Document 1, it is known that a steel lid is attached to the surface side by using a water swallowing port of a circular water channel and a water channel below the water channel as a fixing means.

When replacing the entire circular canal, many steps such as destroying the circular canal, lifting and removing it with a crane, and installing a new circular canal after leveling are required, which requires a long construction time. During that time, the vehicle traffic in the area had to be stopped and the construction work had to be carried out, and the construction work had to be carried out under harsh conditions because the construction work was forced at night when the traffic volume was light. In addition, repairs using reinforcing materials such as steel lids were temporary, such as by driving anchors into existing circular waterways, and were not a permanent measure. Further, when the entire circular waterway is unequally subsided, it is not possible to secure a smooth slope of the waterway, and no drastic repair measures have been taken.

Japanese Unexamined Patent Publication No. 2012-241509

An object of the present invention is that in the repair of a circular waterway in which a defect has occurred, the construction efficiency is high and the construction can be performed in a short time, and the repaired circular waterway has the same strength and shape as the existing portion, and is a long-term circular waterway. It is an object of the present invention to provide a method for repairing a circular waterway that can sufficiently withstand the use of the above, and a precast block, a frame, and a hanging member that can be suitably used for the method.

The present inventors have studied for the purpose of repairing an existing circular waterway with the existing circular waterway installed without replacing the entire circular waterway in order to repair the defective circular waterway in a short time. I proceeded. As a result, by removing the upper part of the existing circular waterway where the defect occurred and providing a concrete layer having a curved surface with the same curvature as the waterway part in the removed part, the entire circular waterway around the defect part is not replaced. It was found that it has excellent strength and can be repaired with excellent connection with existing parts without defects. In particular, by inserting a precast block having a curved surface having the same curvature as the waterway portion into the removed portion to form a concrete layer, and when providing a concrete layer, a cylindrical shape having a cross-sectional radius almost the same as that of the waterway portion. By using the frame of No. 1 and providing a concrete layer above it, it was found that the repair can be done in a short time and a waterway part similar to the existing part with excellent strength after construction can be formed. The present invention has been completed in this way.

That is, the present invention is specified by the following matters.
(1) The upper part of the existing circular water channel in which the defect has occurred is removed over the longitudinal direction having at least the width of the water channel portion to provide a cavity portion, and the channel portion is provided on the water channel portion remaining below the cavity portion. A method of repairing a circular waterway in which a cylindrical frame having a circular cross section having a size along a curved surface of the above-mentioned frame is installed, a concrete layer is provided in a cavity portion above the frame, and then the frame is removed.
(2) The method for repairing a circular waterway according to (1) above, wherein a concrete layer is provided by installing and fixing a precast block in a hollow portion which is an upper portion of a cylindrical frame.
(3) The method for repairing a circular waterway according to (1) or (2) above, wherein the cylindrical frame contracts when it is removed.
(4) The cylindrical frame is expandable and contractible, and when the frame is installed on the water channel portion, it is expanded to form a cylindrical frame having a circular cross section having a size along the curved surface of the water channel portion. The circular shape according to any one of (1) to (3) above, wherein when the frame is removed, the frame is contracted and the frame is removed through a water swallowing port at a location other than the portion provided with the cavity. Waterway repair method.
(5) The precast block is provided by attaching a suspension member longer than the length in the lateral direction of the cavity to the precast block and passing both ends of the suspension member to the side wall of a circular water channel facing the cavity. The method for repairing a circular waterway according to any one of (2) to (4) above.
(6) A concrete precast block having a curved surface having substantially the same curvature as the water channel portion for use in the circular water channel repair method described in (2) to (5) above.
(7) A tube-shaped frame for use in the circular waterway repair method described in (4) and (5) above.
(8) A suspension member provided with a precast block mounting mechanism and a height adjusting mechanism for use in the circular waterway repair method of (5) above.

According to the method for repairing a circular waterway of the present invention, the repair work for a circular waterway in which a defect has occurred can be carried out efficiently and in a short time. In addition, the repaired circular waterway has the same strength and shape as the existing part, and can withstand use as a circular waterway.

(A) A cross-sectional view of a circular waterway of an existing portion where a defect has occurred. (B) A cross-sectional view after removing the upper portion of the circular water channel of the existing portion where the defect shown in (a) has occurred and providing a cavity portion. A cross-sectional view of a state in which a cylindrical frame is installed on the water channel remaining after removing the upper part of the circular water channel, and a concrete precast block is installed on the cylindrical frame. A cross-sectional view showing a state after injecting a grout material between the precast block and the cavity and the frame and curing the material, and removing the cylindrical frame after curing. Top view of the precast block. Side view of the precast block. A cross-sectional view showing a state in which a hanging member is used when installing a precast block. (A) A schematic view of a state in which a tube-shaped frame (before expansion) is installed in a circular water channel after the cavity is provided, as viewed from above. (B) A schematic view of a state in which a tube-shaped frame (after expansion) is installed in a circular water channel after the cavity is provided, as viewed from the side surface.

In the method for repairing a circular water channel of the present invention, the upper part of the existing circular water channel in which a defect has occurred is removed over the longitudinal direction with at least the width of the water channel to provide a cavity, and the cavity remains below the cavity. A cylindrical frame having a circular cross section having a size along the curved surface of the water channel is installed on the water channel, a concrete layer is provided in the cavity above the frame, and then the frame is removed. It is characterized by. The hollow portion in the present invention is provided by removing the upper portion of the existing circular water channel in which the defect has occurred. The width of the cavity may be at least the width of the channel at the depth position of the cavity, and may be equal to or greater than the width of the channel. The length of the cavity in the longitudinal direction is not particularly limited as long as the length is such that all the defects are removed. The depth of the cavity portion is not particularly limited as long as it is a depth below the upper end of the water channel portion, but the depth at the substantially center position of the water channel portion is preferable because the width of the water channel portion in the horizontal direction is the largest. Remove in the longitudinal direction with a width of several centimeters, for example, about 1 to 5 cm on each of the left and right side walls from the width of the channel (that is, the diameter of the channel) to the depth of the approximate center position of the channel. Is preferable. To remove the upper part of the existing circular channel where the defect has occurred, for example, the plunge cutter method is used to cut both ends of the removal range in the transverse direction (short direction), and the removal is performed using a large concrete cutter. This can be done by cutting the vertical direction of the range and lifting and removing the cut portion. After the cavity is provided, the unremoved portion of the channel remains below the cavity.

In the repair method of the present invention, a cylindrical frame having a circular cross section having a size along the curved surface of the water channel portion is installed on the water channel portion remaining under the cavity portion. Here, the cylindrical shape means both a tubular shape having a hollow inside and a cylindrical shape having a non-hollow inside. After that, a concrete layer is provided in the hollow portion which is the upper portion of the cylindrical frame. The concrete layer may be provided by pouring ready-mixed concrete and hardening it, or may be provided by inserting a concrete precast block into the cavity. The precast block to be inserted into the cavity preferably has a curved surface that becomes a water channel after the precast block is fixed on the lower surface at the time of insertion. As the precast block, it is preferable that a curved surface having substantially the same curvature as the water channel portion is formed on the lower surface at the time of insertion so as to extend in the longitudinal direction of the water channel portion at the time of insertion. When a concrete precast block is inserted into the cavity, the precast block can be fixed by injecting a grout material such as mortar into the gap of the cavity and hardening the block. From the viewpoint of ease of construction and quality stability such as strength of the concrete layer to be provided, it is preferable that the concrete layer is provided by a precast block.

After the grout material that fixes the ready-mixed concrete and precast block has hardened, the previously installed cylindrical frame is removed. When ready-mixed concrete is poured and hardened, a curved surface having substantially the same curvature as the water channel portion is formed on the surface in contact with the cylindrical frame, and a new water channel portion is formed. Further, if a precast block having a curved surface having substantially the same curvature as the water channel portion is installed and fixed on a cylindrical frame and then the frame is removed, the precast block newly forms the water channel portion. In the present invention, after removing only the upper portion of the portion where the defect has occurred, a new water channel portion can be formed in the portion to repair the circular water channel. Further, when installing the precast block, if a hanging member longer than the length in the lateral direction of the cavity is attached to the precast block and both ends of the hanging member are passed to the side wall of the circular water channel facing the cavity, the precast block is installed. Can be installed stably. Further, if the hanging member is provided with a height adjusting mechanism, it is possible to adjust the height at which the precast block is installed, the inclination to the left and right, and the like.

The material, structure, and the like of the cylindrical frame used in the repair method of the present invention are not particularly limited as long as they have a circular cross-sectional shape along the curved surface of the water channel, and for example, the material. Examples include resins, rubbers, chemical fibers and the like. The cylindrical frame can be installed from above the cavity when it is installed, but it cannot be removed from above the frame because the upper part of the frame is covered with a concrete layer when it is removed. Therefore, for example, it is preferable that the portion of the circular water channel other than the portion provided with the cavity portion, for example, one that can be contracted so that it can be removed from a water swallowing mouth or the like. The cylindrical frame is expandable and contractible, and when the frame is installed on the water channel portion, it is expanded to form a cylindrical frame having a circular cross section having a size along the curved surface of the water channel portion, and the frame is removed. When this is done, it is preferable that the water channel can be contracted and removed through a water swallowing port at a location other than the portion where the cavity of the water channel is provided. Such materials are not particularly limited in terms of material, structure, etc., but for example, tube-shaped ones are preferable. In the case of a tube-shaped frame, the end is closed at the time of installation and air is inserted to inflate it to form a cylindrical frame of the required size and shape. It can be removed by pulling it out from the waterway through such means. The tube-shaped frame has a structure in which both ends can be closed and at least one of the closed ends can be opened, and a structure having an air inlet is preferable. At least one of both ends of the air inlet may be used as an air inlet, or an air inlet may be provided separately from the both ends.

An embodiment of the present invention will be described below. FIG. 1A shows a cross-sectional view of the circular water channel 1 in which the defective portion A is formed in the lateral direction. As shown by the dotted line in FIG. 1A, the portion including the periphery of the water swallowing port 2 where the defect portion A is generated has a width slightly wider than the width corresponding to the diameter of the water channel portion 3, for example, the left and right side walls. Each of them has a width of about 30 mm, which is wider than the diameter of the water channel 3, and is removed by cutting the periphery of the defect with a plunge cutter or a concrete cutter from above in the longitudinal direction to a depth reaching the center position of the water channel 3. As shown in FIG. 1 (b), the cutting / removal results in the formation of a cavity 4 extending in the longitudinal direction in the upper portion of the circular water channel 1.

FIG. 2 is a diagram showing an example in which a concrete precast block 6 is used to provide a concrete layer. A cylindrical frame B is installed on the water channel portion 3. Then, the concrete precast block 6 is installed on the cylindrical frame B. The precast block 6 has a curved surface having substantially the same curvature as the water channel 3 on the lower surface when inserted, from one end to the other end in the lateral direction of the circular water channel. After that, mortar is injected as a grout material between the side wall 5 and the precast block 6 of the circular water channel facing the cavity 4 and between the cylindrical frame B and the precast block 6 and the side wall 5 to cure and cure. The rear cylindrical frame B is removed. FIG. 3 is a diagram showing a state after the cylindrical frame B is removed, and the gray portion 7 is a portion where the grout material is injected and cured. As shown in FIG. 3, after the removal of the cylindrical frame B, the water channel portion having the same shape as the cylindrical frame B, that is, the water channel portion having the same shape as the original water channel portion, remained without being removed from the precast block 6. It is formed by the water channel portion 3 below the cavity portion 4 and by a slight mortar hardening portion in addition.

FIG. 4 is a view of the precast block 6 as viewed from above. The horizontal plane of the precast block 6 has almost the same size and outer shape as the horizontal plane of the cavity, but is filled with the voids required for inserting the precast block 6 into the cavity and the grout material for fixing the precast block 6. The voids necessary for forming the voids are slightly smaller than the horizontal plane of the cavity to the extent necessary for forming the voids between the side walls 5 of the circular channel 5. The precast block 6 is provided with a water swallowing port 8 leading to a water channel portion which is a through hole having a rectangular cross section. Further, a grout material injection hole 9 which is a recess for injecting the grout material is provided on the side surface. When the grout material injection hole 9 is provided, the grout material can be smoothly injected from between the precast block 6 and the side wall 5. The upper surface of the precast block 6 is inclined downward from the end on the side surface side to the water swallowing port 8 so that rainwater can easily enter the water swallowing port 8. FIG. 5 is a side view of the precast block 6. Reinforcing bars 6 project from both sides of the non-curved portion of the lower surface of the precast block 6. Further, this reinforcing bar portion is omitted in FIGS. 2 and 3. By projecting a part of the reinforcing bar inside the precast block 6 from the lower surface, the bonding strength with the grout material is increased by the anchor effect, and the precast block 6 is integrated.

FIG. 6 is a diagram showing a state in which the suspension member 11 is used when the precast block 6 is installed. The suspension member 11 includes, for example, a bolt 12 for attaching the precast block 6 to a steel plate-shaped member, and a bolt 13 for adjusting the height of the installation position of the precast block 6 in contact with the upper surface of the side wall 5. Have. Further, a spacer 14 is provided to provide an appropriate distance between the suspension member 11 and the precast block 6. For example, when the lower part of the water channel portion 3 is settled, if the precast block 6 is installed on the cylindrical frame B as it is, the settled water channel portion is formed, but the suspension member 11 is used. By providing the height adjusting mechanism 13, the precast block 6 can be installed at a higher position, and the height position of the newly formed water channel portion can be adjusted. Further, by attaching the suspension members 11 at a plurality of locations in the longitudinal direction, it is possible to adjust the height variation in the longitudinal direction and the lateral direction. When the suspension member 11 is used, it is preferable to provide the precast block 6 with a ceramic insert for attaching the mounting bolt 12 of the suspension member 11.

FIG. 7A is a schematic view of the circular water channel 1 after the cavity is provided, and the tube-shaped frame 15 is installed on the water channel below the cavity 4 in an unexpanded state. It is a schematic diagram which shows the state. The tube-shaped frame 15 before expansion is placed on the remaining water channel below the cavity 4, and both ends are pulled out of the circular water channel from the water swallowing ports 2'on both sides facing the cavity 4. , Each end is tightened with the tightening clamp 16 to close it. An air injection tube 17 with a valve is attached to the tube-shaped frame 15. When air is injected into the tube-shaped frame 15 through the air injection tube 17, the tube-shaped frame 15 expands. In this way, the tube-shaped frame 15 is expanded to form the tube-shaped frame 15 as a cylindrical frame whose cross-sectional circular shape is the size along the curved surface of the water channel portion. The state is shown in FIG. 7 (b). A concrete layer is provided above the tube-shaped frame 15 that has become a cylindrical frame, and then the tightening clamp 16 is released to evacuate the air, and the tube-shaped frame 15 is shrunk. The tubular frame 15 is pulled out from the water swallowing port 2'and removed. By using the tube-shaped frame 15 in this way, the frame can be installed and removed with a simple frame structure and operation. The position where the air injection tube is attached is not particularly limited as long as it is a position where air can be injected with the tube-shaped frame 15 installed. As the tube-shaped frame 15, for example, a hose commercially available under the trade name of Sunny Hose (registered trademark) can be preferably used. If a hose having the same diameter as the water channel portion is used, the cylindrical frame of the present invention can be easily manufactured. FIG. 7 shows a case where both ends of the tube-shaped frame 15 are pulled out to the outside of the circular water channel. However, using a tube in which one side is closed in advance, only one side is pulled out to the outside of the circular water channel. It may be installed.

The circular waterway repair method of the present invention can be repaired with the existing circular waterway installed without replacing the entire circular waterway, so that the repair work of the damaged circular waterway can be carried out efficiently. It can be constructed in a short time, and the renovated circular waterway has the same strength and shape as the existing part and can withstand use as a circular waterway, so various roads such as highways, tunnels, etc. It is suitable for the repair work of the circular waterway in. Further, the concrete precast block, the tube-shaped frame and the hanging member in the present invention can be suitably used in the repair method of the present invention.

1 Circular water channel 2 Water swallowing port 2'Water swallowing port 3 Water channel part 4 Cavity part 5 Side wall of circular water channel facing the cavity 6 Precast block 7 Grout material 8 Precast block water swallowing port 9 Grout material injection hole 10 Reinforcing bar 11 Suspended Member 12 Precast block mounting bolt (mounting mechanism)
13 Height adjustment bolt (height adjustment mechanism)
14 Spacer 15 Tube shape frame (before expansion)
15'Tube shape frame (after expansion)
16 Tightening clamp 17 Air injection tube (with valve)
A Missing part B Cylindrical frame

Claims (5)

The upper part of the existing circular waterway where the defect occurred is cut in the longitudinal direction with at least the width of the waterway part in the longitudinal direction , the cut part is removed to provide a cavity part, and the waterway remaining below the cavity part is provided. the frame of the size of the circular cross section cylindrical shape along the curved surface of the water path portion was placed on a section, a concrete layer provided on the cavity comprising the upper portion of the frame, to remove subsequently the frame, Circular waterway repair method. The method for repairing a circular water channel according to claim 1, wherein a concrete layer is provided by installing and fixing a precast block in a hollow portion that is an upper portion of a cylindrical frame. The method for repairing a circular water channel according to claim 1 or 2, wherein the cylindrical frame contracts when it is removed. The cylindrical frame is expandable and contractible, and when the frame is installed on the water channel portion, it is expanded to form a cylindrical frame having a circular cross section having a size along the curved surface of the water channel portion, and the frame is used. The method for repairing a circular water channel according to any one of claims 1 to 3, wherein when the frame is removed, the frame is removed through a water swallowing port at a location other than the portion provided with the cavity. A claim characterized in that a suspension member longer than the length in the lateral direction of the cavity is attached to the precast block, and both ends of the suspension member are passed to the side wall of a circular water channel facing the cavity to install the precast block. Item 8. The method for repairing a circular waterway according to any one of Items 2 to 4.

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