JP2015137450A - Installation structure for concrete water channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent uneven subsidence and floating of precast concrete water channel blocks installed on a weak ground.SOLUTION: In an installation structure for concrete water channel blocks, precast concrete water channel blocks 1 are laid out in a series for forming a water channel by connecting their connection parts. A subsidence prevention block 7 is protruded on an external surface 2A of a standing wall part of the water channel block 1, at the same time connecting the water channel blocks 1 with linking members 11 that have a movable area with respect to the joint opening in the longitudinal direction of the water channel.

Description

  The present invention relates to an installation structure of a precast concrete water channel block, and more particularly to an optimal concrete water channel installation structure used when a water channel is constructed on soft ground.

  Concrete structures such as waterways, culverts and manholes constructed on soft ground may sink or rise due to deformation of the ground. In particular, in the case of an open channel that is continuously laid on soft ground, the larger the exposed portion of the channel block, the greater the effect of dead load, and there is a possibility of uneven settlement.

  In such a precast concrete water channel constructed on soft ground, there are many cases in which the joint portion is damaged in particular, and this may cause water leakage or the like and greatly impair the function. In addition, in the case of sand ground, it must be assumed that liquefaction will occur due to an earthquake and that it will be damaged extensively.

  Usually, as a measure to cope with the uneven settlement, an elastomer or a fiber reinforced elastomer is used for the joint portion of the precast concrete product so that the displacement of the concrete product can be followed by expansion and contraction of the flexible joint. Yes. Many types have been proposed (Patent Documents 1 to 3).

JP 2009-46834 A JP 2005-126985 A JP-A-9-144148

  However, in concrete structures on soft ground, there is a limit to the non-uniform settlement measures depending on the performance of the joints, and it is necessary to install many flexible joints that can largely follow the amount of settlement and the opening in the extension direction. There's a problem. Since concrete products are heavy and tend to sink, it is reasonable to add a load reducing means to prevent the sinking.

On the other hand, as a countermeasure against liquefaction, it is conceivable to use ground improvement or drainage method in combination, but it is inevitable that the construction cost will be expensive.

In order to solve the above-described problems of the prior art, the present invention is designed to prevent the settlement by receiving a dead load of the water channel in a wide area as much as possible by mounting a settlement block outside the concrete water channel. In addition, the present invention proposes a concrete water channel installation structure including a connecting member provided with a movable range in a range in which the function of a water stop joint between the water channel blocks is achieved also in the water channel extension direction.

In order to achieve the above object, in forming a water channel by continuously arranging and extending water channel blocks made of precast concrete, the invention according to claim 1 of the present application is provided with a settlement prevention block on the outer surface of the standing wall portion of the water channel block. When projecting, the concrete water channel installation structure is characterized in that the connecting portions of the water channel blocks are connected by a connecting member having a movable range with respect to the joint opening in the direction of the water channel extension.

In the invention according to claim 2 of the present application, the subsidence prevention blocks provided on the outer surface of the standing wall portion of the water channel block are arranged in a zigzag pattern with different positions in the vertical direction of the standing wall portion. The concrete water channel installation structure according to claim 1, wherein the concrete water channel is installed.

In the invention according to claim 3 of the present application, when the step portion having an upward butting surface and a downward butting surface is formed in the connecting portion of the water channel block, respectively, the upward butting surface and the downward butting are formed. 3. The concrete waterway installation structure according to claim 1 or 2, wherein the surface contacting with the surface is connected via a misalignment bar.

  The invention according to claim 4 of the present application is characterized in that a part or all of the connecting member provided with the movable range is replaced with an elastic or flexible joint attached to the pair of right and left water channel blocks. A concrete water channel installation structure according to claim 1, 2 or 3.

Further, in the invention according to claim 5 of the present application, the precast concrete water channel block is disposed so as to abut the bottom plate portion of the pair of left and right L-shaped blocks, and the gap between the bottom plate portions is abutted from the tip of the bottom plate portion The concrete water channel installation structure according to claim 1, 2, 3, or 4, wherein the concrete water channel is integrally formed by a bottom wall portion made of cast-in-place concrete through protruding protruding bars.

In the invention of the present application, a sinking prevention block is provided on the outer surface of the standing wall of the concrete water channel block so that the dead load of the concrete water channel block can be received in as wide an area as possible, thereby laying the water channel on soft ground. Even in such a case, the dead load of the water channel block can be supported from below, and the dead load of the water channel can be reduced to prevent settlement. The water channel function can be maintained within the movable range of the water joint and the connecting member.

In addition, since the settling prevention blocks projecting on the outer surface of the standing wall portion of the water channel block are arranged in a zigzag pattern with different positions in the vertical direction of the standing wall portion, the settling prevention blocks are moved back and forth ( The waterway blocks (in the direction of the waterway extension) will be held alternately, and even if the ground sinks or rises, it will not cause uneven settlement or uneven uplift.

  Further, when the step part having an upward butting surface and a downward butting surface is respectively formed in the connecting portion of the water channel block, the contact surface between the upward butting surface and the downward butting surface is prevented from slipping. By adopting a configuration connected through, even when the blockage prevention blocks cannot be alternately arranged in a staggered manner in the vertical direction, the water channel blocks are mutually supported by the stepped portion, without causing a vertical displacement, The above effects can be maintained.

  Further, the entire water channel assuming a predetermined displacement is obtained by replacing a part or all of the connecting member provided with the movable range with an elastic or flexible joint attached to the pair of right and left water channel blocks. The flexible structure can be reasonably formed.

  Further, the precast concrete water channel block is disposed by abutting the bottom plate portions of the pair of left and right L-shaped blocks, and the in-situ concrete is provided through a protruding line protruding from the front end of the bottom plate portion between the bottom plate portions. Since the bottom wall portion is integrally formed, the water channel having the necessary water flow cross section can be arbitrarily installed while providing the above-described effect.

It is a perspective view of the water channel block made from the precast concrete used by this invention, and another structural member. It is a top view of the installation structure of the concrete waterway which concerns on this invention. It is sectional drawing of the installation structure of the concrete water channel which concerns on this invention. It is a perspective view of the channel block (2nd Example) made from the precast concrete used by this invention, and another structural member. It is a top view of the installation structure of the concrete water channel of 2nd Example. It is sectional drawing of the installation structure of the concrete water channel of 2nd Example. It is a top view of the installation structure of the concrete water channel of 3rd Example. It is sectional drawing of the installation structure of the concrete water channel of 3rd Example. It is an expanded partial view of the connection part of the concrete water channel of 3rd Example.

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. In FIG. 1 to FIG. 3, reference numeral 1 denotes a precast concrete water channel block, which is an L-shape composed of a standing wall portion 2 and a bottom slab portion 3, and a plurality of protruding streaks from the front end surface 3 </ b> A of the bottom slab portion 3. 4 and 4 protrude.

  7 is a subsidence prevention block attached to the outside of the standing wall portion 2 in the water channel block 1. It is comprised from the horizontal part 9 extended in the outward direction, and the said horizontal part 9 is a part which fulfill | performs the function which supports the said waterway block 1 from the bottom on G, such as soft ground.

  Reference numeral 11 denotes a connecting member, which is formed of a plate having a rectangular shape when viewed from the front. The water channel blocks 1 and 1 are abutted at the front and rear (water channel direction) connection end faces 6 and 6 and connected in the extending direction of the water channel R. In this case, a circular bolt hole 11A is formed on one end side of the connecting member 11, and a long hole 11B which is long in the lateral direction is formed on the other end side. In the drawings, reference numeral 12 denotes an elastic or flexible joint member.

  When the water channel R is constructed on the soft ground G such as a landfill by the members having the above-described configuration, the embankment is preliminarily formed on the soft ground G, and a pair of left and right (water channel width direction) is formed on the embankment. The L-shaped water channel blocks 1 and 1 are arranged to face each other so that the bottom plate portions 3 and 3 face each other, and the tip surfaces 3A and 3A of the bottom plate portions 3 and 3 are separated from each other by a desired dimension. To do.

  Next, in both the water channel blocks 1, 1, the cast-in-place concrete is placed between the front end surfaces 3 A, 3 A of the bottom plate portions 3, 3, and the front end surfaces 4, 4 are placed between the bottom plate portions 3, 3. A bottom wall 5 is formed through the protruding bars 4 and 4 protruding from the bottom. By forming the bottom wall portion 5 by the cast-in-place concrete, the left and right water channel blocks 1 and 1 are integrated through the bottom wall portion 5 in which protruding bars 4 and 4 are embedded, and a predetermined water channel width is obtained. A U-shaped water channel block 1A is formed.

  Another U-shaped water channel block 1A connected to the U-shaped water channel block 1A formed as described above is arranged in front of and behind (water channel extending direction), and both of the U-shaped water channel blocks 1A and 1A are arranged. The connection part end faces 6 and 6 are brought into contact with each other and connected. Next, both the U-shaped waterway blocks 1A and 1A are connected by bolting via the connecting member 11, but one bolt hole 11B of the connecting member 11 is formed as a long long hole in the lateral direction. The connecting member 11 functions as a connecting bracket provided with a movable range that can move by the length of the long hole 11B, and maintains the water channel function.

  By repeating the construction procedure as described above, the U-shaped channel blocks 1A and 1A are arranged side by side on the soft ground G and extended to form the channel R. Next, in the U-shaped water channel block 1 </ b> A which is a constituent member of the water channel R, the settlement prevention block 7 is attached to the outer side surface 2 </ b> A of the standing wall portion 2 with a bolt 10. Specifically, by attaching the hanging portion 8 of the subsidence prevention block 7 to the standing wall portion outer surface 2A of the water channel blocks 1A, 1A with a bolt 10, one horizontal portion 9 is directed outward from the outer surface 2A of the standing wall portion 2. Installed in a horizontally protruding state.

  Here, since the U-shaped channel block 1A, 1A is installed in a state where the upper surface of the soft ground G is pressed by the lower surface of the horizontal portion 9 of the settlement prevention block 7, the U-shaped channel block The loads 1A and 1A are supported from below by embankment and soft ground G through the horizontal portion 9 of the settlement prevention block 7. Thereby, the dead load of the water channel R is reduced, and the settlement of the water channel blocks 1A and 1A can be prevented.

  Further, when the sinking prevention block 7 is mounted on the outer surface 2A of the standing wall portion of the U-shaped water channel block 1A, 1A at the hanging portion 8, the height position of the horizontal portion 9 of the sinking prevention block 7 is raised and lowered. It is set as the arrangement | positioning arrange | positioned in the zigzag form which was different in. As a result, the subsidence prevention block 7 holds the U-shaped waterway blocks 1A and 1A in the front and rear (waterway direction) alternately. Even if the ground subsidence or lift occurs, the waterway blocks 1A and 1A are not the same. No subsidence or uneven uplift.

  Next, after the U-shaped water channel blocks 1A, 1A are arranged side by side and extended to form a water channel R, the U-shaped water channel blocks 1A, 1A are elastically or flexibly straddled across the connection end faces 6, 6. A flexible joint member 12 is disposed on the water channel surface side, and both end edges of the joint member 12 are attached to the front and rear water channel blocks 1A and 1A by screws 13. The joint member 12 is deformed corresponding to the opening of the joint in the range of the movable range of the connecting member 11 and retains the water leakage prevention function of the water channel R.

  4 to 6 show a concrete water channel installation structure according to a second embodiment of the present invention. The difference from the first embodiment shown in FIGS. 1 to 3 is that an L-shaped water channel block 1 is used. , 1 and only the connecting portions before and after (water channel extension direction), and other configurations are the same as those of the first embodiment.

  More specifically, in FIGS. 4 to 6, reference numerals 26 and 26 denote end faces of the connecting portion of the L-shaped channel block 1, and 27 and 27 are formed at a height position of about ½ of the total height of the channel block 1, respectively. It is a stepped part. The stepped portions 27 formed on the connection portion end surface 26 respectively form an upward butting surface 28A on one connection portion end surface 26 and a downward butting surface 28B on the other connection portion end surface 26.

  Reference numeral 29 denotes a slip-off reinforcing bar. When connecting the front and rear (water channel direction) water-block blocks 1 and 1 with the connecting portion end faces 26 and 26 of the water-channel block 1 being brought into contact with each other, Are pushed into the vertical holes respectively formed in the butting surfaces 28A and 28B. As a result, when the connecting portions of the front and rear water channel blocks 1 and 1 are integrally connected by the misalignment reinforcing bars 29, the upper and lower abutting surfaces 28A and 28B support each other in the vertical direction, and the front and rear water channels There is no vertical displacement between the blocks 1 and 1.

  FIG. 7 to FIG. 9 show a third embodiment of the concrete water channel installation structure according to the present invention. The difference from the first embodiment shown in FIG. 1 to FIG. Only the portion of the connecting structure of the front and rear U-shaped waterway blocks 1A, 1A arranged in the above, and the other structures are the same.

  In the figure, 1A is a U-shaped channel block, and when the U-shaped channel blocks 1A and 1A installed at the front and rear are connected to the outer surface 2A in the vicinity of the connecting portion end surface 6 of the standing wall portion 2, A ridge portion 30 extending in the vertical direction for attaching the member is formed. Reference numeral 31 denotes a horizontal through hole formed in the protruding line portion 30. In the illustrated embodiment, the horizontal through hole 31 is formed at predetermined intervals in the vertical direction in the height direction of the water channel block 1A. Is provided with a connecting member, which will be described later, having a movable range as long as it functions as a water stop joint between the water channel blocks 1A and 1A.

  A connecting member 32 is a bolt 33 inserted into the matching lateral through-holes 31, 31 in the protruding strips 30, 30 formed on the outer side surface 2 </ b> A near the connection portion end surface 6 of the water channel block 1 </ b> A. A nut 34 fixed to one end side of the bolt 33, a hard rubber ring 35 installed on the other end side of the bolt 33, and a nut 36 fixed via the hard rubber ring 35. The front and rear water channel blocks 1A, 1A are connected by tightening nuts 36 of the bolts 33 so that they can be moved within the range of expansion and contraction of the hard rubber ring 35.

  37 is a connecting member according to another embodiment, and a bolt 38 inserted into the matching lateral through holes 31, 31 and nuts 40, 40 screwed to both ends of the bolt 38 via coil springs 39, 39. The front and rear water channel blocks 1A, 1A are connected by tightening nuts 40 of the bolts 38 so that they can move within the range of expansion and contraction of the coil springs 39, 39.

DESCRIPTION OF SYMBOLS 1 L-shaped water channel block 1A U-shaped water channel block 2 Standing wall part 2A Outer side surface 3 Bottom plate part 3A Tip surface 4 Extrusion line 5 Bottom wall part 6.26 Connection part end surface 7 Settling prevention block 8 Hanging part 9 Horizontal part 10 32 connecting member 11B long hole 12 elastic or flexible joint member 13 screw stopper 27 step 28A upward abutting surface 28B downward abutting surface 29 misalignment bar 30 convex strip 31 lateral through hole 33/38 bolt 34/40 Nut 35 Hard rubber ring 39 Coil spring

Claims (5)

  It is a water channel installation structure in which water channel blocks made of precast concrete are continuously arranged and extended, and the connection parts of the water channel blocks are connected to form a water channel, and a settlement prevention block is provided on the outer surface of the standing wall portion of the water channel block. A concrete waterway installation structure characterized in that when projecting, the connection parts of the waterway blocks are connected by a connecting member provided with a movable range with respect to the joint opening in the direction of extension of the waterway.   2. The concrete-made concrete according to claim 1, wherein the settling prevention blocks projecting from the outer surface of the standing wall portion of the water channel block are arranged in a zigzag shape with different positions in the vertical direction of the standing wall portion. Waterway installation structure.   When a step having an upward butting surface and a downward butting surface is formed at the connecting portion of the water channel block, the surface of the surface between the upward butting surface and the downward butting surface is connected via a misalignment bar. The concrete water channel installation structure according to claim 1 or 2, wherein the concrete water channel is connected.   The concrete water channel according to claim 1, 2 or 3, wherein a part or all of the connecting member provided with the movable range is replaced with an elastic or flexible joint attached to the pair of right and left water channel blocks. Installation structure.   The precast concrete water channel block is disposed by abutting the bottom plate portions of a pair of left and right L-shaped blocks, and a bottom made of cast-in-place concrete through a protruding line projecting from the tip of the bottom plate portion between the bottom plate portions. 5. The concrete water channel installation structure according to claim 1, 2, 3, or 4, wherein the concrete water channel is formed integrally with a wall portion.

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