JP2017082510A - Method for removing circular channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for removing a circular channel that can remove the entire section of a failed circular channel portion without damaging the other portion of the circular channel.SOLUTION: The front and rear positions of a prescribed section regarding a failed existing circular channel 1 is vertically cut by a blade of a rotary blade cutting machine so as to form a first concrete unit 14 to be removed, and the first concrete unit 14 to be removed is hoisted and removed. After the removal, the rear position of a prescribed section of a subsequent circular channel is vertically cut and is divided right and left to be half-split circular channels so that second and third concrete units to be removed are formed and are hoisted and removed. The method for removing the second and third concrete units to be removed is repeated over the longer direction so that the existing circular channel with a prescribed length is removed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a circular water channel removal method for separating a circular water channel only in a specific section where damage has occurred in a circular water channel continuously extending in the longitudinal direction and removing the circular water channel from above.

  The circular waterway used for the side ditch etc. of the road was introduced from France in 1970, and its construction extension has exceeded 3,000 km so far. Since the original one has been used continuously, it has deteriorated over 40 years after the completion of construction, and various damages have occurred due to some external factors such as defects in the surrounding area and impact. There is.

  For example, the opening of the water intake is exposed on the surface side of the circular water channel, but the left and right side walls of the upper part that form the water intake are cantilevered parts, which are structurally weak and damaged. Or the phenomenon which collapses and expands until the opening width of about 60 mm reaches about 200 mm width has arisen.

  When the opening width is widened as described above, there is a risk of tire removal from a motorcycle or a light vehicle. This defect is caused by the deterioration of the concrete on the surface side and the corrosion of reinforcing bars due to the use over time, in addition to the structurally weak strength.

  In addition, there are cases in which the entire circular waterway sinks in a predetermined section of the circular waterway that continues in the longitudinal direction, causing a step between the road surface and damage on the lower side of the waterway. One reason for this is thought to be accompanying subsidence of embankments and subsidence of foundations that support circular waterways.

  A repair method for covering a damaged or collapsed portion with a separate lid is performed for the above-mentioned water intake on the surface side and problems around the water intake. For this purpose, a certain thickness of the upper part of the circular water channel is removed, a grating lid with a predetermined thickness is attached, and a striped steel plate lid is attached in consideration of smooth drainage.

  The former grating lid has the advantage of being able to use common materials, while the latter striped steel plate lid only requires attaching the striped steel plate to the existing circular waterway with anchor bolts. It is excellent in workability as a countermeasure for the necessary trouble spots, and the stagnation mouth installed in the striped steel plate lid has sufficient drainage capacity, and it is 360 mm / hour, which is the same as a rectangular channel with the same opening. It has been confirmed by experiments that it is possible to drain even the amount of rainfall.

  However, in the former case, it took time, labor and accuracy to remove the upper part of the circular channel, and there were difficulties in construction capacity and economy, and there was a risk of damaging the main body of the circular channel during lifting. .

  In the latter case, it is assumed that the longitudinal gradient in the short direction of the water channel changes and water is accumulated, and if the inside of the circular water channel is damaged, water leakage occurs, There are concerns about subsidence of circular waterways and adverse effects on the roadbed.

  Furthermore, when the lower part of the circular channel is damaged or when the entire circular channel is depressed, it is necessary to destroy the circular channel and replace the entire channel. It was difficult, and there was a possibility that the normal circular waterway would be affected if the separation of the removal section was confirmed by fishing.

  As shown in FIG. 10, Patent Document 1 described below shows a repair method in the case where the concrete at the intake port is partially damaged. A metal cover plate C that closes the opening of the water intake B in the circular water channel A, a metal fixing bracket D that has an arc shape substantially along the curved surface of the circular water channel A and is narrower than the width of the water intake port, and the metal Using a circular water channel repair metal fitting composed of a fastening bolt E and a nut F that connect the central parts of the metal fixing plate D and the metal lid plate C, the concrete at the intake B part in the circular water channel A is damaged. The metal cover plate C can be fixed in a state in which the chipped portion is closed, and can be easily repaired by simply covering the opening of the damaged portion in the water intake.

  However, as described above, this repair method could not cope with the case where the inside or the lower part of the circular waterway was damaged or the entire main body was depressed.

Utility Model Registration No. 3194020

  The present invention solves the above-mentioned drawbacks, and makes it possible to remove the entire section of the defective circular water channel portion without damaging the remaining circular water channel. In the removed section, a new precast circular canal is separately provided thereafter, and a continuous canal can be completed with the existing circular canal.

  In the present invention, in the short direction of the existing circular water channel, from the upper surface part to the base part bottom is vertically cut by a blade by a rotary blade cutting machine, and the circular water channel at the rear position separated by a predetermined dimension is the same as described above. Cut vertically by the method to form a first removed concrete unit, hang it over the first removed concrete unit so that the lifting device is located, and attach the coupling device attached to the first removed concrete unit to the first removed concrete unit. Fixed to the lifting device, the first removed concrete unit is lifted and removed while cutting the edges of both sides in the longitudinal direction of the circular water channel between the predetermined dimensions with the installation surface, and the longitudinal predetermined dimensions after the removal Vertically cut the short direction of the circular water channel at the rear position far away to the bottom of the base by the blade of the rotary blade cutting machine, and the center of the inner bottom surface of the circular water channel Is cut vertically along the longitudinal direction to the bottom of the base part, and wedges are driven from the upper side between the longitudinal side walls and the installation surface of the circular channel to cut the edges between the side walls and the installation surface at the center. Forming the second and third removed concrete units as cut half-circular water channels, fixing the connecting tool and the elevator attached to each of the second and third removed concrete units; A circular water channel that lifts and removes each of the third removed concrete units, and removes an existing circular water channel of a predetermined length by repeating the formation and removal of the same unit as the second and third removed concrete units in the longitudinal direction. It is characterized by the removal method.

  Also, in the short direction of the existing circular water channel, from the upper surface part to the bottom of the base part is vertically cut with a blade by a rotary blade cutting machine, and the circular water channel at a rear position separated by a predetermined dimension is obtained by the same method as above. A vertical cutting is performed, and both longitudinal wall surfaces in the longitudinal direction of the cut circular water channel between the predetermined dimensions are edge-cut with the installation surface to form a first removed concrete unit, and a lifting device is mounted on the first removed concrete unit. The connecting unit attached to the first removed concrete unit is fixed to the lifting device, the first removed concrete unit is lifted and removed, and the longitudinal direction after the removal is separated by a predetermined dimension. The circular direction of the circular channel at the rear position is vertically cut by the blade of the rotary blade cutter until it reaches the bottom of the base, and the central part of the inner bottom surface of the circular channel is Cut vertically in the longitudinal direction until reaching the bottom of the section, and wedges are inserted from the upper side between the longitudinal side walls and the installation surface of the circular channel to cut the edges between the side walls and the installation surface and cut at the center. The second and third removed concrete units are formed as half-circular water channels, and the connecting tool and the elevator attached to each of the second and third removed concrete units are fixed, and the second and second The removal of the circular water channel that removes the existing circular water channel of a predetermined length by lifting and removing each of the 3 removed concrete units and repeating the formation and removal of the same unit as the second and third removed concrete units in the longitudinal direction. Characterized by construction method.

  Further, the rotary blade cutting machine forms a pilot hole at a position close to the vertical cutting portion as a pre-process of vertical cutting of the circular water channel, and inserts the rotating device column of the rotary blade cutting machine body into the pilot hole, It is characterized in that the circular water channel is removed by vertically cutting the circular water channel by lowering the rotation axis of the blade along the rotating device column.

  Further, the blade of the rotary blade cutting machine is characterized by a removal method of the circular water channel formed by rotating and lowering at least a position where the bottom side load-bearing reinforcement of the circular water channel is cut.

  Further, as a pre-process for vertically cutting the central portion of the bottom surface of the circular water channel inside the water channel to the bottom of the base portion in the longitudinal direction, the side wall of the water intake port is removed or the upper surface side of the water channel portion is destroyed to open the water intake port. It is characterized by a circular waterway removal method that employs a process that facilitates the introduction of a cutting machine that vertically cuts the center portion of the bottom surface into the waterway.

  According to the method for removing a circular channel of the present invention, the circular channel that leaves only a predetermined section of the defective circular channel can be removed without giving vibration or impact, and the end surface in the short direction of the remaining circular channel is vertical. The new precast circular waterway can be installed as it is from above and connected to the remaining circular waterway, and only the defective part can be easily replaced with the new precast circular waterway. became.

  By the above removal method, it is possible to remove the defective part in a short time, and the new installation can be performed in a short time. It became possible to shorten the time extremely.

  In addition, since the construction method was able to remove the entire defective circular channel instead of partial repair, all the circular channels installed after this removal will be newly constructed, and it is extremely likely that the problem will recur in that part. It became possible to reduce it.

The longitudinal direction side view which shows the state which cuts a circular water channel perpendicularly | vertically. (A), (b) Sectional drawing which shows the relationship between the circular water channel and a braid | blade in a transversal direction. The perspective view which shows the rotary blade cutting machine used for this construction method. The top view which shows the state which formed the pilot hole in the circular waterway. (A) The perspective view which shows the lifting apparatus which removes the circular water channel of predetermined length, (b) The AA sectional drawing. (A) The side view which shows the state which installed the lifting apparatus on the circular water channel, (b) The side view which shows the state which has raised the circular water channel by the lifting device. The perspective view which shows the process of removing the circular water channel of a back position. Sectional direction sectional drawing which shows the other Example of the process of removing a circular waterway. The perspective view which shows the process of making a circular waterway into a right-and-left half state. Sectional drawing of the prior art example of circular waterway repair.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.

  FIG. 1 is a side view showing a method for removing a predetermined section of an existing circular water channel 1 in which a problem has occurred. First, a rotating blade is disposed in the short direction of the longitudinal front position of the existing circular water channel 1 in which a problem has occurred. The blade 3 is rotated and lowered by the cutting machine 2 to cut from the upper surface 4 of the circular water channel 1 to the bottom 6 of the base portion 5 to form a first vertical cutting portion 7. The base portion 5 is formed in advance to support the circular water channel 1 when it is installed.

  As shown in the cross-sectional views of FIGS. 2A and 2B, the entire circular water channel 1 can be cut in the short direction by rotating the blade 3 down to the bottom 6 of the base portion 5. it can. When the blade 3 reaches the bottom 6 of the base portion 5 below the water channel portion 8, the strength bars 9 arranged on the left and right side walls below the circular water channel 1 can be cut. As described above, the cutting edge can reach the bottom 6 of the base portion 5 or lower by rotating and lowering the disk-shaped blade 3 to the position where the strength bar 9 is cut.

  As shown in FIG. 3, the rotary blade cutting machine 2 has a blade 3 that is rotatably fixed to a shaft 11 that moves up and down along a support column 10, and as shown in FIG. A pilot hole 12 is formed in advance at a position in contact with a predetermined position of the first vertical cutting portion 7, and the strut 10 enters the pilot hole 12 as the blade 3 rotates and descends. The circular water channel 1 can be cut deeply in the vertical direction, and the first vertical cutting portion 7 can be formed.

  After the end of the cutting of the first vertical cutting portion 7, the circular water channel 1 at a rear position separated by a predetermined dimension forms a cutting portion that becomes the second vertical cutting portion 13 by the rotational drop of the blade 3 as described above. The installation method of the rotary blade cutting machine 2 is performed by providing the pilot holes 12 in the same manner as when the first vertical cutting unit 7 is cut.

  The longitudinal dimension up to the second vertical cutting portion 13 which is the rear position is a rectangular first removed concrete unit which becomes a concrete block mass of the circular water channel 1 formed by the first and second vertical cutting portions 7 and 13. For example, a dimension such as a position of about 1 m is appropriately selected.

  To remove the first removed concrete unit 14, a lifting device 15 shown in FIGS. 5 (a) and 5 (b) is used. As an example of the lifting device 15, a lifting device 15 having a shape mounted on the circular water channel 1 shown in FIGS. 5A and 5B is used. The lifting device 15 is a frame structure 16a, 16b made of a pair of left and right H-shaped steel bars in parallel with each other that can be passed over the front and rear upper surface 4 positions of the cut first removed concrete unit 14. The connecting plates 17a and 17b having a substantially U-shaped cross-section covering the upper and lower webs at both ends of the frame bodies 16a and 16b, and the lower receiving plates 18a and 18b of the connecting plates 17a and 17b are extended to the tip portions. Projecting plates 19a and 19b bent in an orthogonal direction, and both ends to be placed on the upper surface 4 of the circular water channel 1 which are the front and rear positions of the projecting plates 19a and 19b below the lower receiving plates 18a and 18b. Raised mounting plates 20a and 20b, jacks 21a and 21b arranged between the lower receiving plates 18a and 18b and the mounting plates 20a and 20b, and the lower francs on the center side of the left and right frame bodies 16a and 16b. It is formed of a connector 22a, 22b, 22c, 22d serving as a latching means, such as lifting U bolts evenly spaced apart a predetermined dimension.

  Since the connecting plates 17a, 17b and the mounting plates 20a, 20b are formed as separate bodies, a combination as a set, installation at a predetermined position, etc. by connecting the two in advance with a predetermined length chain or the like. Becomes easy.

  As shown in FIG. 6A, the placing plates 20a and 20b are placed on the upper surface 4 of the circular water channel 1 at the front and rear positions of the first removed concrete unit 14, and the frame bodies 16a and 16b are placed in the first 1 It arrange | positions so that the removal concrete unit 14 may be straddled above.

  On the upper surface 4 of the first removed concrete unit 14, the removed concrete unit side couplers 23a, 23b, 23c, 23d such as anchors are located at positions that coincide with the positions of the couplers 22a to 22d fixed to the frame bodies 16a, 16b. Is fixed in advance.

  By connecting the connecting members 22a to 22d on the side of the frame bodies 16a and 16b and the connecting members 23a to 23d on the side of the first removal concrete unit 14, respectively, the jacks 21a and 21b at the front and rear positions are then raised evenly. The frame bodies 16a and 16b can be raised while maintaining a horizontal state. As the jacks 21a and 21b, appropriate ones such as an air bag type, a mechanical type or a hydraulic type are used, and those effective for lifting at least about 3 tons are used. Air jack is the best because it is easy to carry and handle.

  In the case of an air jack, as shown in FIG. 6 (b), air can be blown into a bag body having a bellows-like strength, and the frame bodies 16a and 16b can be raised by the bulging.

  The edge cutting between the base part 5 of the first removed concrete unit 14 and the left and right side wall parts 25a, 25b and the connection between the installation surface and the like is ascending force of the jacks 21a, 21b or between the jacks 21a, 21b and the elevator 24. It can be done with the ascending force by the combined use.

  When the edge removal of the first removal concrete unit 14 is performed only by the lifting force of the jacks 21a and 21b, it is possible when the edge cutting with the installation surface is preceded by a separate means in advance or when the connection with the installation surface is small. . As described above, when there is little connection with the installation surface, the lifting force is increased by adding the lifting force of the elevator 24 to the lifting force of the jack, and the elevator 24 is swung vertically and horizontally as necessary. Thus, the first removed concrete unit 14 can be reliably cut off from the base portion 5, the first and second vertical cut portions 7, 13, and the left and right side wall portions 25a, 25b and the installation portion.

  In order to lift and remove the first removed concrete unit 14, suspension means 26a to 26d are provided in advance at predetermined positions of the frame bodies 16a and 16b, or a string-like body 27 made of a chain or a wire is attached to the frame body 16a, It is necessary to wind and connect to 16b and to be integrated with the elevator 24.

  As described above, the first removed concrete unit 14 separated from the installation portion by the jacks 21a, 21b or accompanied by the force of the elevator 24 is moved by the elevator 24 via the suspension means 26a, 26b and the string-like body 27. The first lifting concrete unit 14 can be removed from the state shown in FIG. 6 (a) through the state shown in FIG. 6 (b).

  The jacks 21a, 21b, the elevator 24, and, if necessary, the left and right side walls 25a, 25b of the first removed concrete unit 14 by a lifting force while swinging the elevator 24 up, down, left and right, roads such as concrete pavement and asphalt pavement. It can be cut off from the installation surface such as a surface or a slope. On the other hand, when the integration with the installation surface is much stronger, such as when a circular waterway is constructed on-site, separate construction is performed in advance to rim the side walls 25a, 25b and the installation surface in advance. The first removed concrete unit 14 is lifted and removed by the lifting force of the jacks 21a and 21b.

  The edge cutting can be performed by the rotary blade cutting machine 2 as described above, or other general devices can be used. Although the edge cutting may also extend over the entire side wall 25a, 25b of the main body, it may be performed only in part if necessary, and is determined in consideration of the lifting force of the jacks 21a, 21b and the elevator 24. become.

  After lifting and removing the first removed concrete unit 14, the lifting device 15 is removed from the installation position.

  After the removal of the first removed concrete unit 14, as shown in FIG. 7, the circular water channel is caused by the rotation and lowering of the blade 3 by the rotary blade cutting machine 2 in the short direction at the rear position away from the circular water channel 1 by a predetermined length in the longitudinal direction. A third vertical cut portion 28 is formed from the top surface 4 of 1 to the bottom 6 of the base portion 5.

  The formation of the third vertical cut portion 28 is performed by forming the pilot hole 12 in advance and rotating and lowering the blade 3 using the pilot hole 12 in the same manner as the first and second vertical cut portions 7 and 13. It will be.

  Thereafter, a central cutting portion 29 is formed by vertically cutting the central portion on the bottom surface side of the water channel portion 8 in the longitudinal direction until reaching the bottom 6 of the base portion 5 by using the same rotary blade cutting machine 2 as described above or a general concrete cutting machine. To do. The cutting width is about 6 mm.

  In forming the central cutting portion 29, a cutting machine such as the blade 3 is inserted from the water intake 30. The width of the water intake 30 is about 60 mm, and there is a possibility that a cutting tool cannot be inserted. . In that case, as shown in FIG. 8, the water intake side walls 31a and 31b forming both side walls of the water intake 30 are removed or the upper surface side of the water channel is destroyed so that a large opening is obtained.

  The central cutting portion 29 cuts vertically along the longitudinal direction of the circular water channel 1 to the bottom 6 of the base portion 5 to at least the position of the third vertical cutting portion 28, and then, as shown in FIG. Between the longitudinal side walls 25a and 25b of the circular water channel 1 up to the cutting portion 28 and the installation surface, wedges 32 are driven from above to cut the edge of the circular water channel 1 and the installation surface. By cutting the edge by driving the wedge 32, the circular water channel 1 includes a base part 5 in the center direction on the side of the water intake 30 in a state where the half-divided circular water channels cut to the left and right are separated from the base part 5. It can be tilted and can be an independent concrete mass. As a result, the second and third removed concrete units 33 and 34 are individually formed.

  By connecting and fixing a connecting tool such as an anchor to the upper surfaces of the second and third removed concrete units 33 and 34 in advance, the connecting tool and an elevator such as a crane are connected to each other. The removal concrete units 33 and 34 can be raised and removed.

  As described above, since the circular water channel 1 is lifted and removed in the left and right halved states, the third vertical cutting portion 28 can be obtained by using an elevator having the same ability as that of the removal of the first removed concrete unit 14. As the cutting position, for example, a position of 2 m or more, which is a position twice or more that of the first removed concrete unit, is appropriately selected.

  After the removal of the second and third removed concrete units 33, 34, the same construction as the removal of the second and third removed concrete units 33, 34 is repeated, so that a predetermined section of the circular channel 1 in which a defect has occurred All can be removed. Therefore, like the front end cut surface, the end cut surface of the remaining circular water channel from which the final removed concrete unit has been removed remains as a vertical cut portion.

DESCRIPTION OF SYMBOLS 1 Circular waterway 2 Rotary blade cutting machine 3 Blade 4 Upper surface 5 Base part 6 Bottom 7 1st vertical cutting part 8 Waterway part 9 Strength bar 10 Strut 11 Axis 12 Pilot hole 13 2nd vertical cutting part 14 1st removal concrete unit 15 Lifting Device 16 Frame 17 Connecting plate 18 Lower receiving plate 19 Protruding plate 20 Mounting plate 21 Jack 22 Connecting device 23 Removal concrete side connecting device 24 Elevator 25 Side wall portion 26 Lifting means 27 String-like body 28 Third vertical cutting portion 29 Center cutting Part 30 Water intake 31 Water intake side wall 32 Wedge 33 Second removed concrete unit 34 Third removed concrete unit

Claims (5)

  In the short direction of the existing circular channel, from the upper surface to the base of the base is vertically cut with a blade by a rotary blade cutter, and the circular channel at the rear position separated by a predetermined dimension is cut vertically by the same method as above. Then, a first removed concrete unit is formed, spanned so that the lifting device is positioned on the first removed concrete unit, and a connector attached to the first removed concrete unit is fixed to the lifting device. Then, the first removed concrete unit is lifted and removed while cutting the both side walls in the longitudinal direction of the circular water channel cut between the predetermined dimensions with the installation surface, and the rear position separated by a predetermined length in the longitudinal direction after the removal. The vertical direction of the circular channel is cut vertically by the blade of the rotary blade cutter until it reaches the bottom of the base, and the center of the inner bottom of the channel of the circular channel is the base Cut vertically in the longitudinal direction until reaching the bottom, and a wedge was driven from the upper side between the longitudinal side walls and the installation surface of the circular channel to cut the edges between the side walls and the installation surface and cut at the center. The second and third removed concrete units are formed as half-circular water channels, and the connecting tool and the elevator attached to each of the second and third removed concrete units are fixed, and the second and third Each of the removed concrete units is lifted and removed, and the existing circular water channel of a predetermined length is removed by repeating the formation and removal of the same unit as the second and third removed concrete units in the longitudinal direction. Removal method of circular waterway.   In the short direction of the existing circular channel, from the upper surface to the base of the base is vertically cut with a blade by a rotary blade cutter, and the circular channel at the rear position separated by a predetermined dimension is cut vertically by the same method as above. Then, both side walls in the longitudinal direction of the circular water channel cut between the predetermined dimensions are edge-cut with the installation surface to form a first removed concrete unit, and the lifting device is located on the first removed concrete unit The connecting position attached to the first removed concrete unit is fixed to the lifting device, the first removed concrete unit is lifted and removed, and the rear position separated by a predetermined length in the longitudinal direction after the removal The circular direction of the circular channel is cut vertically by the blade of the rotary blade cutting machine until it reaches the bottom of the base, and the center of the inner bottom of the circular channel is the bottom of the base The halves were cut vertically in the longitudinal direction, and wedged from the upper side between the longitudinal side walls and the installation surface of the circular channel to cut the edges between the side walls and the installation surface and cut at the center. The second and third removed concrete units are formed as circular water channels, the connecting tool and the elevator attached to each of the second and third removed concrete units are fixed, and the second and third removed A circular water channel characterized in that each concrete unit is lifted and removed, and an existing circular water channel having a predetermined length is removed by repeating the formation and removal of the same unit as the second and third concrete units in the longitudinal direction. Removal method.   The rotary blade cutting machine forms a pilot hole at a position close to the vertical cutting portion as a pre-process of vertical cutting of the circular water channel, and inserts the rotating device column of the rotary blade cutting machine body into the pilot hole, and the rotating device 3. The circular water channel removing method according to claim 1, wherein the circular water channel is vertically cut by lowering a rotating shaft of the blade along the support column.   4. The method for removing a circular water channel according to claim 1, wherein the blade of the rotary blade cutting machine is rotated and lowered at least to a position at which the bottom side strength reinforcement of the circular water channel is cut.   As a pre-process for vertically cutting the center of the inner bottom of the circular channel to the bottom of the base, the side wall of the intake is removed or the upper surface of the channel is broken to widen the opening of the intake The method for removing a circular waterway according to any one of claims 1 to 4, wherein a step of facilitating introduction of a cutting machine that vertically cuts the center portion of the bottom surface into the waterway is adopted.

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