JP2005307452A - Method of regenerating concrete open channel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supplement the strength of an open channel 10 by a reinforcement net 18 installed between the open channel 10 and a panel 20 by locking the reinforcement net 18 and the panel 20 to bar-like members 14 to easily install them to the inner surface of the open channel 10 and forming the inner surface of the water channel 10 of the panel 20 with small roughness to secure drain capacity of the open channel 10. <P>SOLUTION: The bar-like members 14 are installed in the inner surface of the concrete open channel 10 with anchors 12, and the reinforcement net 18 is fitted to the bar-like members 14 with binding bands. The surface of the panel 20 with small roughness is faced toward the opposite side of the open channel 10, the locking members 24 of the panel 20 are inserted though clearances of the reinforcement net 18, and the locking members 24 are fitted to the bar-like members 14. The filler 38a is filled between the panel 20 and the inner surface of the open channel 10 to integrally form the open channel 10, the reinforcement net 18, and the panel 20 with each other so as to regenerate the open channel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for rehabilitating a concrete open channel, and more particularly, to a method for rehabilitating a concrete open channel, in which, for example, the flow rate is restored and the strength of the water channel is restored without destroying an aged channel.

  In a general method for rehabilitating a concrete open channel, a panel or the like is attached to the inner surface of the concrete open channel, and a filler or the like is filled between the inner surface and the panel. According to this method, since the width of the open channel becomes narrow, the flow rate of the water flowing through the open channel decreases.

An example of a conventional method for rehabilitating a concrete open channel that solves this problem is disclosed in Patent Document 1. In the concrete water channel repair structure of Patent Document 1, a plurality of holes are formed in the side surface and the bottom surface of the concrete water channel, and anchor bolts are fixed to the holes. A mortar is poured on the bottom, a plate-like body having a thick film layer is placed on the mortar whose surface is leveled, and the plate-like body is fixed to an anchor bolt with a nut. Next, the plate-like body is fixed to the anchor bolt with a nut so that the plate-like body is parallel to the side surface, and mortar is poured between the side surface and the plate-like body.
JP 2000230226 A [E02B 5/02]

  In the prior art of Patent Document 1, since the inner surface roughness of the concrete open channel is improved, the flow rate can be secured, but since the filler is only mortar and does not contain reinforcing bars, the strength recovery of the concrete open channel itself is not difficult.

  Therefore, the main object of the present invention is to provide a method for rehabilitating a concrete open channel that can restore sufficient strength while ensuring a flow rate.

  The invention of claim 1 is: (a) a rebar wire mesh is arranged at a distance from the inner surface of the concrete open channel, and (b) a panel having an inner surface whose roughness is smaller than the center of the concrete open channel than the rebar wire mesh. A method for rehabilitating a concrete open channel, which is attached to the open channel, and (c) a filler is filled between the inner surface of the concrete open channel and the panel.

  In the invention of claim 1, the flow rate of water is increased by reducing the surface roughness of the panel against the decrease in the flow rate in the open channel by attaching a panel or the like to the inner surface of the concrete open channel. It is possible to ensure sufficient drainage capacity.

  By filling a filler between the inner surface of the open channel and the panel, the open channel, the reinforcing bar mesh, and the panel are integrated, and the renovated open channel can obtain an integrated strength. In particular, by inserting a reinforcing bar with high tensile strength, the strength of the filler such as mortar and concrete, which has high compressive strength but low tensile strength, is compensated, so that the open channel can sufficiently withstand earth pressure and water pressure. it can.

  According to a second aspect of the present invention, in the step (a), an attachment material extending in the longitudinal direction is attached to the inner surface of the concrete open channel with an anchor, and a rebar wire mesh is locked to the attachment material. Is the method.

  In the second aspect of the invention, the reinforcing bar mesh can be easily attached to the inner surface of the open channel, even if the inner surface of the open channel is uneven, since it is only necessary to attach the reinforcing bar to the attachment material fixed in advance to the inner surface of the open channel with an anchor. Can do.

  The invention of claim 3 is the concrete open channel rehabilitation method according to claim 2, wherein the panel is locked to the mounting member in the step (c).

  In the invention of claim 3, it is easier to lock the panel to the bar-like member directly attached on the inner surface of the uneven open channel than to attach the flat plate to the inner surface in parallel with a gap.

  The invention of claim 4 is the method for rehabilitating a concrete open channel according to claim 2 or 3, wherein the attachment material is a hollow perforated pipe.

  In the invention of claim 4, since the attachment material is attached to the inner surface of the open channel and is covered with the panel, if the attachment material is a perforated tube in which a plurality of through holes are formed on the side wall of the hollow tube, the attachment material is attached. The material can be used as a filler inlet. That is, by inserting a filling hose or the like into the mounting material and injecting a filling material such as mortar, the filling material flows from the through hole of the perforated pipe between the inner surface of the open channel and the panel. This space can be filled evenly.

  According to the present invention, the strength of the concrete open channel itself can be recovered by securing a flow rate using a panel having a small inner surface roughness and providing a reinforcing bar in the filler between the inner surface and the panel.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  In the method for rehabilitating the concrete open channel 10 according to one embodiment of the present invention, first, the deteriorated portion of the inner surface of the existing open channel 10 is removed by high-pressure washing or the like.

  Then, as shown in FIG. 1, the attachment position of the attachment material of a rod-shaped member (FIG. 2) is determined on the basis of the upper end 10a of the side wall of the open channel 10 inclined in the longitudinal direction. For example, the anchor 12 is struck on the left and right side surfaces of the open channel 10 with the upper and lower two positions spaced apart from each other and the left and right two positions spaced at the bottom surface as the attachment positions of the rod-shaped members. And the anchor 12 is hit | damaged to the position of 2 places on a bottom face, two places on each side surface at intervals in the longitudinal direction of the open channel 10.

  The anchor 12 is directed perpendicularly or obliquely upward with respect to the side surface of the open channel 10, and only the tip of the anchor 12 strikes the side wall of the open channel 10. The anchor 12 on the bottom surface is made perpendicular or oblique to the bottom surface, and the tip is applied to the bottom surface. As shown in FIG. 2 (A), a rod-like member 14 is placed on each anchor 12 that continues in the longitudinal direction of the side surface of the open channel 10, and the anchor 12 that is fixed beside or obliquely to the anchor 12 that is fixed vertically to the bottom surface. The rod-shaped members 14 are respectively installed on the side where the angle is small.

  The rod-shaped member 14 is a hollow tube, and as shown in FIG. 2 (B), it is a perforated tube in which a large number of through holes 14a are formed on the side surface. The rod-shaped members 14 are regular materials, and may be arranged so as to extend in the longitudinal direction of the open channel 10, or adjacent rod-shaped members 14 may be coupled to each other by a short hollow coupling tube socket 16.

  When the six rod members 14 are attached to the inner surface of the open channel 10, the reinforcing bar 18 shown in FIG. 3 is attached to the rod member 14 with a binding band or the like. The rebar metal mesh 18 is U-shaped as a whole, and the rectangular metal mesh 18b for the side faces vertically with respect to the rectangular metal mesh 18a for the bottom face horizontally, and the rectangular metal mesh 18c for the corner portion is sandwiched between them. Are welded in advance. As shown in FIG. 4, the rebar metal mesh 18 is put inside the bar-shaped member 14, and the bar-shaped member 14 and the rebar metal mesh 18 are joined using a binding band (not shown) or the like.

  When the inner surface of the open channel 10 is covered with the rebar wire mesh 18, the panel 20 shown in FIG. The panel 20 is a rectangular plate-shaped member made of a resin such as vinyl chloride resin or waste plastic, for example, having a short side of 30 cm and a long side of 2 m. One surface 20a of the panel 20 is a smooth surface with a small roughness, and the other surface 20b is provided with a plurality of T-shaped protrusions 22, and each protrusion 22 is parallel to the long side of the panel 20 at intervals. Extend. In addition, fitting grooves 20 c are formed at both ends of the panel 20.

  A locking member 24 is inserted between two adjacent T-shaped protrusions 22 of the panel 20. The locking member 24 has a T-shaped fixing portion 26, and one end of a rod 28 screwed in a spiral shape is fixed in the fixing portion 26. An arc-shaped fitting portion 30 is attached to the other end of the rod 28, the arc angle of the fitting portion 30 is greater than 180 degrees, and the fitting portion 30 opens on the opposite side to the rod 28. The fixing portion 26 is inserted between the T-shaped protrusions 22 at positions corresponding to the rod-shaped member 14 and attached to the panel 20.

  As shown in FIG. 6, the long side of the panel 20 is set in the longitudinal direction of the open channel 10, and the surface of the panel 20 on which the protrusions 22 are formed faces the inner surface side of the open channel 10. The locking member 24 of the panel 20 is passed through between the reinforcing bar meshes 18, the fitting portion 30 of the locking member 24 is fitted to the rod-shaped member 14, and the panel 20 is attached to the rod-shaped member 14. When attaching the plurality of panels 20 to the side surface and the bottom surface of the open channel 10, the panels adjacent to each other in the short side direction of the panels are connected by a joint member 32 shown in FIG.

  The joint member 32 is a belt-shaped body made of a resin such as vinyl chloride resin. Two ridges 32a and two protrusions 32b are provided symmetrically on one side, the order of which is protrusion 32b, ridge 32a, ridge 32a, and protrusion 32b. The tip of the flange 32a faces the center of the joint member 32, and a fitting groove is formed between the protrusion 32b and the flange 32a.

  The projection 32b of the joint member 32 is fitted into the fitting groove 20c of the panel 20, the end of the panel 20 is fitted between the flange 32a and the projection 32b of the joint member 32, and the adjacent panels are connected by the joint member 32. .

  Further, the panels 20 adjacent to each other in the long side direction of the panel 20 are connected by a connecting member 35 shown in FIGS. 7B and 7C. The connecting member 35 has a prismatic central axis 35a, and a plurality of, in this embodiment, six insertion portions 35b are provided on both side surfaces thereof. The insertion portion 35b has a U shape having two side surfaces and one bottom surface, the width W of the bottom surface is the gap between the projections 22 of the panel 20, and the height H of the side surface is the height of the shaft portion 22a of the projections 22. . Each insertion portion 35 b is joined to the central shaft 35 a with a space therebetween so that the side surfaces thereof face each other, and the gap D is the width of the shaft portion 22 a in the projection 22 of the panel 20. When the panel 20 is inserted into one side surface of the connecting member 35, the shaft portion 22a of the projection 22 of the panel 20 contacts the outside of the side surface of the insertion portion 35b, and the inner surface of the panel 20 contacts the outside of the bottom surface of the insertion portion 35b. When the shaft portion 22a of the projection 22 of the panel 20 is inserted into the gap between the adjacent insertion portions 35b, the connecting member 35 and the panel 20 are joined. Similarly, if another panel 20 is inserted into the other side surface of the connecting member 35, the joining member and the other panel 20 are joined, so that the adjacent panels 20 are connected via the connecting member 35.

  In addition, when attaching the panel 20 to the rod-shaped member 14, the notch 34 shown to FIG. 8 (A) is previously provided in the both surfaces of the panel 20 in the panel 20 used as the corner | angular part of the open channel 10 in parallel with the long side of the panel 20. Keep it. As shown in FIG. 8B, the panel 20 bends at the position of the notch 34. Therefore, the panel 20 is attached to the rod-shaped member 14 along the corners of the open channel 10 as shown in FIG. A gap between the end of the bent panel 20 and the panel 20 attached to the bottom surface is filled with an adhesive 36 or the like.

  If the inner surface of the open channel 10 is covered with the panel 20, then the filling hose 38 is inserted into the rod-shaped member 14 and inserted to the back of the rod-shaped member 14. If a filling material 38a such as mortar is injected from the nozzle of the filling hose 38 while pulling the filling hose 38 forward, the filling material 38a comes out of the through hole 14a of the rod-shaped member 14, and the inner surface of the open channel 10 and the panel The open channel 10, the reinforcing bar 18 and the panel 20 are integrated. At this time, the T-shaped protrusions 22 provided on the panel 20 exhibit a throwing effect on the filler 38a, making it difficult for the panel 20 to come off. The T-shaped protrusion 22 also has an effect as a spacer for creating a space between the panel and the reinforcing bar net 18. Thereby, the panel 20 can be arrange | positioned in the position spaced apart from the reinforcing bar metal net 18 by a fixed space | interval.

  Thus, if the rod-shaped member 14 is first attached to the inner surface of the open channel 10, even if the inner surface of the open channel 10 is uneven, the reinforcing bar mesh 18 and the panel 20 are locked to the rod-shaped member 14, so Can be easily attached to the inner surface of the open channel 10. Moreover, since the rod-shaped member 14 leaves | separates between the inner surface of the open channel 10 and the panel 20 at a fixed space | interval, it can take here as the space of the filler 38a. Furthermore, by using a perforated tube for the rod-shaped member 14, the filler 38a can be injected from the rod-shaped member 14, and the space between the inner surface of the open channel 10 and the panel 20 is evenly filled. be able to. Therefore, the bar-shaped member 14 not only serves as an attachment material for the panel 20 or the like, but also secures a space for the filler 38a and further serves as an inlet for the filler 38a. Therefore, the open channel 10 can be renewed easily and quickly. .

  Since the roughness of the inner surface of the panel 20 is small, the flow rate of water can be increased without disturbing the water flow, and the drainage capacity of the open channel 10 can be sufficiently secured.

  Rather than being based on the aging and uneven inner surface of the open channel 10, the upper end of the side wall of the open channel 10 that is originally inclined is used as a reference. Water can flow smoothly.

  By integrating the open channel 10, the rebar wire mesh 18 and the panel 20 using the filler 38 a, the high tensile strength rebar 18 has the strength of the filler 38 a such as mortar and concrete having high compressive strength and low tensile strength. In order to compensate, the renovated open channel 10 can sufficiently withstand earth pressure and water pressure. For example, as shown in FIG. 9, the reinforcing bar 10a on the inner surface side of the open channel 10 out of the two reinforcing bars 10a and 10b in the side wall of the open channel 10 is rusted or aged, and its strength decreases. Even so, the reinforcing bar 10b opposite to the inner surface of the open channel 10 and the newly attached reinforcing bar 18 are integrated by the filler 38a, so that the strength of the open channel 10 can be maintained. .

  In this way, strength can be recovered by adding and integrating reinforcing bars, but the simplest is to reinforce the concrete by placing reinforcing bars in the soil outside the open channel. However, this method requires an outside excavation, which makes construction difficult and greatly increases the cost. On the other hand, in this embodiment, the strength can be recovered by adding a reinforcing bar, and further, the workability is good and the cost can be suppressed because the outside cutting is unnecessary.

  In addition, although the rod-shaped member 14 was fixed to the inner surface of the open channel 10 by the anchor 12, it may be fixed by a band 40 shown in FIG. The rod-shaped member 14 is arranged at the mounting position on the inner surface of the open channel 10, the band 40 is fitted into the rod-shaped member 14, and both ends of the band 40 are hit against the inner surface of the open channel 10 by the anchors 12.

  Moreover, although the side surface 18b of the reinforcing bar mesh 18 is oriented perpendicularly to the bottom wire mesh 18a, the present invention is not limited to this. For example, when the side surface of the open channel 10 is inclined outward, the side surface The shape of the reinforcing bar mesh 18 is appropriately changed according to the shape of the open channel 10, for example, the metal mesh 18 b is inclined according to the outward inclination of the side surface of the open channel 10. Furthermore, although the bottom wire mesh 18a, the side wire mesh 18b, and the corner wire mesh 18c are joined by welding to form the U-shaped rebar wire mesh 18, the rebar wire mesh may be bent into a U shape.

  Furthermore, although the reinforcing bar mesh 18 previously formed in the U-shape was used, an L-shaped reinforcing bar mesh 42 shown in FIG. 11A may be used. In the wide open channel 10, as shown in FIG. 11 (B), two L-shaped reinforcing bars 42 are arranged in a U-shape so as to face each other, and another rectangular shape is formed on the bottom portion between them. Reinforcement wire mesh 44 is added. On the other hand, as shown in FIG. 11 (C), two L-shaped reinforcing bar meshes 42 are disposed facing each other in the narrow open water channel 10 and the bottom portions are overlapped. In this way, the two L-shaped reinforcing bar meshes 42 can be made to face each other to correspond to the width of the open channel 10.

  The rebar wire mesh 18 is not a wire mesh, and a rebar or a combination of rebars may be used instead.

  Furthermore, although the fitting part 30 of the locking member 24 has an arc shape, it may have a circular shape.

  The locking member 24 is inserted between the two T-shaped protrusions 22, but may be integrally formed with the panel 20.

  Further, the locking member 24 for attaching the panel 20 to the rod-like member 14 has a fixing portion 26 inserted between two adjacent T-shaped projections 22, but instead of this, a truncated cone shown in FIG. A locking member 48 having a fixed portion 46 having a shape may be used. In this locking member 48, the other end of the rod 50 having one end connected to the arcuate fitting portion 30 penetrates the fixing portion 46 and protrudes from the upper surface having a small diameter of the fixing portion 46. A spiral screw is cut in the protruding portion 50a. When the protruding portion 50a is heated and pressed against the panel 20 made of olefin resin or the like, the panel 20 is melted and the bar 50 is pierced and fixed to the panel 20. In this way, the locking member 48 can be easily attached to the panel 20. In addition, by setting the small-diameter surface of the truncated cone-shaped fixing portion 46 to the panel 20 side, the fixing portion 46 exhibits an anchoring effect on the filler 38a.

  In addition, as the locking member 24, a locking member 52 shown in FIG. The locking member 52 is formed by integrally forming a T-shaped fixing portion 48 and an arc-shaped fitting portion 30. When this locking member 52 is used, it is necessary to provide a dedicated protrusion 56 for attaching the locking member 52 between the T-shaped protrusions 22 of the panel 20. Moreover, you may use the latching member 58 shown to FIG. 13 (B) which thickened the neck part 54a of FIG. 13 (A). In the locking member 52 of FIG. 13A, the anchoring effect is shown by narrowing the neck portion 54a. However, as the locking member 58 of FIG. 13B is made thick, the neck portion 54a is made strong. To do.

  Further, the panel 20 used at the corner of the open channel 10 is cut at only one place, but the panel 20 placed at two places may be used as shown in FIG. If cuts 34 parallel to the long side of the panel 20 are formed at the same position on both sides of the panel 20, the panel 20 can be bent at two locations as shown in FIG. The corner of the open channel 10 can be formed.

  Furthermore, instead of using a rod-shaped member that is a hollow, perforated round tube, a solid rod may be used as the attachment member 14.

  As for the attachment member 14, a hollow perforated square tube 60 shown in FIG. 15 may be used. The perforated tube 60 has a quadrangular cross section, and a through hole 60a is provided on the side wall.

  In addition, as the panel 20 used in the above-mentioned embodiment, basically, a strip-like body used for rehabilitation of an old pipe can be used, but other panel materials may be used as a matter of course. .

  Moreover, although the panel 20 adjacent in the longitudinal direction was connected by the connection member 35, the edge part of the panel 20 was made into a fitting shape without using the connection member 35, and the edge parts of this panel 20 were directly connected. May be.

  Further, the side wall panel 20 is bent at the position of the notch 34 to form a corner, but a connecting member 62 shown in FIG. 16 may be used at the corner. The connecting member 62 is a plate-shaped body of a rectangular long material, and cuts 64 extending in the longitudinal direction are formed at two locations on the short side. Through holes 66 are provided at both ends in the longitudinal direction at intervals, and U-shaped recesses 68 are formed at both ends. The width of the recess 68 is the thickness of the panel 20. In this case, the panel 20 is covered on the side wall and the bottom surface of the open water channel 10, leaving the corners of the open water channel 10, and the connecting members 62 are attached to the corners. First, the connecting member 62 is bent at the notch 64, and one concave portion 68 of the connecting member 62 is fitted into the lower end portion of the side panel 20, and the other concave portion 68 is fitted into the end portion of the bottom panel 20, The panel 20 with the bottom surface is connected by a connecting member 62. Then, the anchor 12 is inserted into the through hole 66 of the connecting member 62 and driven against the inner surface of the open channel 10, and the connecting member 62 is fixed to the inner surface of the open channel 10, and then between the connecting member 62 and the panel 20. Apply adhesive to the joints.

It is sectional drawing which shows the state which attached the anchor to the open channel comprised by the rehabilitation method of the concrete open channel of one Example of this invention. It is sectional drawing which shows the state which attached the rod-shaped member to the open channel of FIG. It is sectional drawing which shows the rebar metal mesh attached to the rod-shaped member of FIG. It is sectional drawing which shows the state which attached the reinforcing bar metal mesh of FIG. 3 to the rod-shaped member of FIG. (A) is sectional drawing which shows the panel which attached the locking member. It is sectional drawing which shows the state which attached the panel of FIG. 5 to the open channel of FIG. (A) is sectional drawing which shows the state which connected the panel of FIG. 5 in the short side direction with the joint member, (B) is sectional drawing which shows the state which connected the panel in the long side direction with the connection member, C) is a perspective view showing a panel and a connecting member. (A) is sectional drawing which shows the panel used for the corner | angular part of an open channel, (B) is sectional drawing which shows the state which bent the panel of (A). It is sectional drawing which shows the state which renewed the open channel. It is sectional drawing which shows the fixing method of another rod-shaped member which can be used for the rehabilitation method of this invention. (A) is a perspective view which shows another example of the rebar wire mesh which can be used for the rehabilitation method of this invention, (B) is sectional drawing which shows the state which uses the rebar wire mesh of (A) for a wide open channel. And (C) is a cross-sectional view showing a state in which the reinforcing bar mesh of (A) is used for a narrow open channel. It is sectional drawing which shows another example of the locking member which can be used for the rehabilitation method of this invention. (A) is sectional drawing which shows another example of the locking member which can be used for the rehabilitation method of this invention, (B) is a cross section which shows the locking member which made the neck part of the locking member of (A) thick. FIG. (A) is sectional drawing which shows another example of the panel which can be used for the rehabilitation method of this invention, (B) is sectional drawing which shows the state which bent the panel of (A). It is a perspective view which shows another attachment member which can be used for the rehabilitation method of this invention. It is a fragmentary sectional view which shows the state which connected the connection member to the panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Concrete open channel 12 ... Anchor 14 ... Bar-shaped member 18 ... Reinforcement wire mesh 20 ... Panel 38 ... Filler

Claims (4)

(A) A rebar wire mesh is arranged at an interval from the inner surface of the concrete open channel,
(B) A panel having an inner surface whose roughness is smaller than the center of the concrete open channel than the rebar wire mesh is attached to the concrete open channel, and (c) filling between the inner surface of the concrete open channel and the panel. Rehabilitation method of concrete open channel filled with wood.   2. The method for rehabilitating a concrete open channel according to claim 1, wherein, in the step (a), an attachment member extending in a longitudinal direction is attached to an inner surface of the concrete open channel with an anchor, and the reinforcing bar mesh is locked to the attachment member.   The method for rehabilitating a concrete open channel according to claim 2, wherein, in the step (c), the panel is locked to the attachment member.   The method for rehabilitating a concrete open channel according to claim 2 or 3, wherein the attachment material is a hollow perforated pipe.

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