JP2006002481A - Concrete pit repairing method and device for use therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of reduction in diameter of an existing cylindrical concrete public pit constructed by assembling blocks, and the problem occurring at the time of repairing the public pit except for an invert, because of attachment and insertion of a pipe joint or the like into a lower end of the pit beforehand, under the circumstance that the public pit undergoes deterioration with the lapse of time at joint portions between piled blocks, and that roots of plants infiltrate into the joint portions to hinder functions of the pit. <P>SOLUTION: There is provided a concrete pit repairing method, according to which only a PVC vertical pipe 7 is inserted into the public pit 1A having a vertical wall 5 of a vertically constant internal diameter. The PVC vertical pipe 7 has an expanded diameter section 6 at a lower end thereof, that makes internal contact with the vertical wall 5, so that a gap between the vertical wall 5 and the vertical pipe 7 is minimized. Then, mortar with high fluidity is poured in the gap to repair the public pit. Thus the bore of the vertical pipe 7 is kept unchanged in spite of the repair. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concrete repair method and apparatus for concrete, and more particularly to that of public works.

  In general, in the case of a public mascot made by a public sewer administrator, which is installed at the downstream end of the home piping, and is maintained by a public sewer manager, it is assembled and constructed in the same manner as a concrete manhole. The whole is a factory product, and the blocks are stacked on site.

  That is, for example, as shown in FIG. 5, the public slat 50 is loaded with a pipe mounting wall 54 having a PVC inflow pipe 52 and an outflow pipe 53 respectively on a bottom plate 51 forming an inverter. The straight wall 55 is stacked, the inclined wall 56 and the adjustment ring 57 are stacked on the straight wall 55, and the lid 58 and the receiving frame 59 are placed and fixed on the adjustment ring 57.

  Further, such a public mass 50 is required to have a solid and durable structure, and in particular, since it is a block assembly as described above, a joint portion (seam) between these blocks is not recommended in order to prevent infiltration of groundwater. It is said that it is necessary to carry out mortar construction carefully, and that it is necessary to be tightly connected to prevent displacement between blocks during an earthquake.

  By the way, general concrete sewage equipment has deteriorated due to long-term earth pressure due to road surface load, etc., and this deteriorated, for example, sewage pipe is inserted with a PVC pipe having a smaller diameter than that. The sewage pipe is repaired or regenerated by pouring mortar into the donut-shaped space (see, for example, JP-A-62-127586).

  And even though the public assembly 50 made of the block assembly type concrete has been carefully finished, when it is used over a long period of time, pipes, side lumps, etc. (the straight wall 55, the inclined wall 56, etc.) Since the mortar used in the joint parts peels off and plant roots, groundwater or rainwater infiltrates from the outside and closes the pipelines, these joint parts are repaired and regenerated.

The following proposals have been made for such repair methods.
In the proposal of Japanese Patent No. 29898647, when a vinyl chloride main body having an outflow inlet corresponding to the outflow inlet is set in an existing concrete wall, the PVC main body is connected to the outlet. Introducing repair methods for connecting joints to be connected in advance. In addition, in the proposal of Japanese Patent Laid-Open No. 2001-193147, an existing concrete made-inverter has a curved cover that covers each invert part on the outflow inlet side, and these The repair method covered with a cover body with an upward cleaning tube receptacle in the middle of the cover is introduced.

  However, in any of the above-mentioned proposals, an inner PVC inspection tube or cleaning pipe is attached to the lower end of the inner side of the existing concrete side wall lump in advance. Therefore, there is a problem that the diameter is reduced accordingly.

  In particular, the existing concrete slabs are not only small in size but also difficult to work inside, as with the small concrete manholes established by the Sewerage Association. The smaller diameter of the cylinder has a further adverse effect.

  Therefore, the present invention is made of existing concrete. However, for example, if round No. 3 sewage is used, the inner diameter of the side lump is determined to be approximately 300 mmφ, and the above problem is solved. It is something to try.

  In order to solve such a problem, the present invention provides: 1) In an existing block assembly type concrete made by suspending or standing a synthetic resin standing pipe substantially inscribed in its straight wall, It is in the repair method of concrete made by pouring a filler between the vertical pipes and repairing the joints and cracks of the straight wall, and 2) the existing block assembly type round concrete -In the manufacturing process, only a synthetic resin standpipe with a generally cylindrical body that is substantially inscribed in the straight wall is suspended or erected, and a filler is poured between the straight wall and the standpipe so that the straight pipe It is a concrete repair device characterized by repairing joints and cracks on the wall, and 3) an enlarged diameter portion is provided at the lower end of the vertical pipe, and the enlarged diameter portion is in sliding contact with the straight wall. The repair method of the concrete made according to each of claims 1 or 2, Located in the device and, 4) the leaving less straight walls, concrete of the described other from replacing claim 1 to 3 - a repair method or gist the device of bets made masu.

  According to the present invention, only the damaged part of the straight wall including cracks due to deterioration or aging of the concrete is repaired, so that the healthy part is left as it is, and the efficiency of the repair (simply moving the pipe upward) Of course, it is possible to improve the workability such as no need to connect to the outflow / inflow pipeline by simply inserting it from the pipe, and to save material by simply using only the pipe body. Can be made as large as possible, and as a result, the dimensions are close to the existing diameter, and the functions of the vertical pipe, that is, inspection and insertion of cleaning tools, etc., will be the same as before, and this will not be hindered. .

  In particular, it is convenient for a small-diameter concrete made, and there is no trouble or cracking in durability after repair. If there is earthquake-proof construction at the joint, it can be reinforced and used as it is.

  Furthermore, since the public mascot is installed in the vicinity of the public road, the block joint can be easily damaged by the slight vibration of the roadway.

  The invention will be described in more detail by means of an embodiment shown in the accompanying drawings.

  1 to 4 show each installation of the embodiment method of the present invention. FIG. 1 (A) is a longitudinal sectional view of a public block made of an existing block assembly type round concrete, and FIG. 1 (B) is a diagram. 1 (A) is a cross-sectional view of excavating the ground surface to leave the side lump, FIG. 2 (C) is a cross-sectional view of a state where a repair stand pipe is installed in FIG. 1 (B), and FIG. 2 (D) is a diagram. 2 (C) is a cross-sectional view of a state in which mortar is poured by an injector, FIG. 3 (E) is a cross-sectional view of a state in which a standing tube is covered with a lid or the like in FIG. 2 (D), and FIG. E) is a cross-sectional view of a state where the excavated portion is backfilled, FIG. 4 is a partial cross-sectional view of the standpipe shown in FIGS. Turn into.

  First, the outline | summary of the Example (method and apparatus) of this invention is described.

  In a public block 1 made of an existing block-assembled round concrete, with the passage of time, for example, the roots of plants invade from the joints, that is, the joints 2 2... When a complaint or problem occurs that blocks 4 or the like, the straight wall 5 that forms the same inner diameter in the vertical direction of the concrete wall 1 of the concrete can be used for simple repairs, without needing to replace the product. A vertical pipe 7 made of PVC (synthetic resin) having only a diameter-expanded portion 6 whose bottom end is expanded so as to be in contact with the inner surface (including a seal but having a generally cylindrical shape) 5 is suspended while being in sliding contact with the inner surface of 5 and positioned so that the expanded diameter portion 6 is equal to or lower than the lowest joint 2a. Pour high mortar 8 and make the stand 7 public 1 Carry out the repair method of interior.

  And the simple construction which covers directly the sealing lid (20) currently used widely by the small diameter made from a vinyl chloride at the upper end of this standing pipe 7 is performed.

  If this is expressed numerically as an example, when the inner diameter of the straight wall 5 is 350 mmφ, the outer diameter of the riser tube 7 used therein is 318 mmφ, the outer diameter of the expanded portion 6 is 340 mmφ, and the expanded portion A seal (ring) 9 is fitted on the outer periphery of 6 and brought into sliding contact with the inner surface of the straight wall 5. And the pipe length of this vertical pipe 7 is good to use the thing of 750 mm in the case of this public first.

  This vertical pipe 7 is attached to a general-purpose polyvinyl chloride injection-molded product, and the product accuracy is extremely high. Particularly, the center circularity is high, which is convenient for a block assembly type which is a factory production with high processing accuracy.

  Next, the vertical pipe 7 will be described in detail.

  In FIG. 4, a downward trumpet-shaped enlarged diameter portion 6 is formed at the lower end of the PVC pipe 7. The downward trumpet-shaped diameter-expansion angle θ is about 15 °, the diameter-expansion bending length L is 40 mm, and a seal (ring) 9 is attached to the outer periphery of the diameter-expanded portion 6 and attached. The outer periphery of the seal 9 prevents leakage of the mortar 8 flowing in.

  In addition, the outer peripheral surface below the vertical pipe 7 is provided with a sanding portion 10 having a vertical width of about 200 mm, coated with a synthetic resin adhesive, and uniformly coated with dry silica sand. The riser 7 and the mortar 8 to be poured are firmly fixed.

  And the standpipe 7 may form the enlarged diameter part 6 by post-processing, such as hot press molding, at one end of the extruded product made of PVC.

  Next, the repair using the vertical pipe 7 will be described in detail.

  1 to 3, the existing public block 1 made of block-assembled round concrete shown in FIG. 1A forms an inverter 11 and is provided with an outlet 12 to which a PVC pipe is connected. .. Are placed on a bottom plate 13 as a bottom lump through side walls, for example, three (several) block straight walls 5a, 5a... Via adhesive mortar (not shown), and these straight walls 5 have the same inner diameter. The inner surface of the is formed.

  Furthermore, the slant wall 14 which is an upper lump is placed on these straight walls 5, and the slant wall 14 is covered with a lid member 15, and the upper surface of the lid member 15 is made to coincide with the ground surface GL.

  When such a problem occurs in the existing public mast 1, as shown in FIG. 1B, the vicinity of the public mast 1 is excavated 16 to the extent that only the upper mass can be removed, and the lid member 13 and the inclined wall 14 are removed. except.

  Next, as shown in FIG. 2 (C), when the vertical pipe 7 is installed in the straight wall 5 and the enlarged diameter portion 6 at the lower end is positioned below the lowest joint 2a of the side lump, A grip retaining ring used for a portion having no groove is wound around and the standing tube 7 is temporarily fixed to the straight wall 5.

  That is, the grip screw fastening portion 18 of the temporary fixing band 17 serving as a half retaining ring is locked to the upper end surface of the straight wall 5, and the vertical pipe 7 is suspended in the straight wall 5.

  Therefore, by using the temporary fixing band 17, the vertical tube 7 is concentric with the straight wall 5.

  Therefore, as shown in FIG. 2D, mortar (filler) 8 is poured into the narrow donut-shaped space 19 between the inner surface of the straight wall 5 and the outer surface of the vertical tube 7 by the injector 21. The mortar 8 is preferably a non-shrinkage quick setting mortar with good fluidity.

  Next, as shown in FIG. 3 (E), a vinyl chloride (sealing lid commonly used for small-diameter polyvinyl chloride) or cast iron lid member 20 is set on the vertical pipe 7, and the mortar is cured. Of course, this set prevents foreign matter from falling during the curing period.

  In the case of a public mast 1A installed under a public road, cover with a protective lid with a base (not shown).

  Then, as shown in FIG. 3 (F), the temporary fixing band 17 is removed, or it is backfilled as it is to make a repaired public mass 1A.

  In addition, when a method not using the temporary fixing band 17 for increasing concentricity with the straight wall 5 is described, when the inverter 11 is a straight, the lower end of the vertical pipe 7 is straddled across these inverters 1. A pair of concave portions is formed, and the vertical pipe 7 is brought into contact with the uppermost inclined portion on the inverter.

  And if the leakage of the injected mortar is prevented by fitting a packing with a lip having a large cross section in the portion below the lowest joint 2a in the vertical pipe 7, the vertical pipe 7 can be erected on the straight wall 5. Therefore, the suspension of this specification may include standing.

  In short, the inner surface of the concrete public waste 1 and the PVC stand 7 may be processed into the same shape, but a circular stand is preferred.

It is explanatory sectional drawing of the Example of this invention. It is other explanatory sectional drawing of FIG. FIG. 5 is still another explanatory sectional view of FIG. 2. It is principal part sectional drawing of a present Example. This is a conventional example.

Explanation of symbols

1, 1A Public masu 2, 2a Seam 5 Straight wall 7 Stand pipe 8 Mortar

Claims (4)

  In an existing block assembly type concrete, a synthetic resin standing pipe that is substantially inscribed in the straight wall is suspended or erected, and a filler is poured between the straight wall and the standing pipe, A concrete repair method characterized by repairing joints and cracks on straight walls.   In an existing block assembly type round concrete, only a synthetic resin standpipe with a generally cylindrical body that is inscribed in the straight wall is suspended or erected, and the straight wall and the standpipe are placed between them. A concrete repair apparatus for concrete made by pouring a filler to repair joints and cracks on the straight wall.   The method for repairing concrete made of concrete according to claim 1 or 2, wherein an enlarged diameter portion is provided at a lower end of the vertical pipe, and the enlarged diameter portion is slidably in contact with a straight wall.   4. The repair method or apparatus for concrete made of concrete according to any one of claims 1 to 3, wherein the portion below the straight wall is left and the others are replaced.

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