JP4812451B2 - Waterway repair method - Google Patents

Description

  The present invention relates to a construction method for repairing a water channel by laying a water channel molded body in an existing water channel.

  When refurbishing an existing waterway, a method of filling the gap between the existing waterway and the waterway molded body with a backfilling material after laying the waterway molded body in the existing waterway has been adopted. For example, air mortar obtained by kneading cement, water, aggregate, and foaming agent, and fluidized soil obtained by mixing water and the like with earth and sand and adding a solidifying material thereto are often used.

  However, when the molded body for the water channel is directly laid in the existing water channel through which water flows, the back material is diluted by the flowing water, or the quality of the back material is deteriorated due to material separation. There is.

  Therefore, as shown in FIG. 7, by using a water stop material 100 such as a sheet pile, a bypass existing water channel 102 of the existing water channel 101 is provided to completely shut off water from the repaired portion, and then the water channel molded body at the repaired portion. 103 was laid and backfilled with backfill soil.

  However, when this construction method is adopted, there is a problem that the construction period becomes longer by the amount of providing the bypass water channel and the cost is increased.

  The present invention has been made in view of the above points, and even if a backfill material is directly placed at a repaired place where water flows, dilution or material separation does not occur. The purpose is to provide a method for repairing a canal that can be reliably repaired.

  The water channel renovation method of the present invention is a plastic injection obtained by laying a water channel molded body in an existing water channel and stirring and mixing the liquid A composed of cement milk and the liquid B composed of a suspension containing a plasticizer. After the material is injected into the gap formed between the existing water channel and the molded body for water channel to stop the flow of water in the gap, the plastic injection material is injected into the remaining gap. The gap is filled by pouring.

  The term “plasticity” as used herein refers to a property that is in a gel-like aggregate state and is not diluted with running water or the like, and is unlikely to deviate to the surroundings due to its shape imparting property.

  It is preferable to provide a mold at a boundary portion of the filling portion of the plastic injection material to reduce the amount of water in the filling portion.

  According to the method of repairing a water channel of the present invention, there is no material separation or dilution of the molded product for the water channel in the flowing water even if the backfill material is directly injected into the water channel of the water channel. There is no need to stop the water, and the construction cost and construction period can be greatly reduced.

  Also, after injecting the plastic injection material into the gap formed between the existing water channel and the water channel molded body to stop the flow of water in the gap, and then injecting the plastic injection material into the remaining gap, The plastic injection material injected into the gap can be reliably prevented from being swept away in an aggregated state, the plastic injection material can be smoothly injected, and workability is improved.

  In addition, if the seam of the water channel molded body is plugged with a plastic injection material injected into the gap, the work process for plugging the seam becomes unnecessary, and the efficiency of the construction work is improved, and the seam is plugged. The construction cost can be reduced because no special water-stopping material is required.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a waterway repair method according to the present invention will be described with reference to the drawings.

1 to 4 show a construction process of a waterway repair method using a plastic injection material.
(1) As shown in FIGS. 1 and 2, a molded tube 2 such as a fume tube is continuously laid in the existing water channel 1 through which the water channel water 3 flows along the water flow direction indicated by an arrow. Thereby, as shown by the arrow of the figure, the canal water 3 flows in the forming pipe 2, and the canal water 3 also flows in the gap 4 between the forming pipe 2 and the existing canal 1. The molded tube 2 is an example of a water channel molded body.
(2) Next, as shown in FIGS. 3 and 4, the plastic injection material 5 is injected into the gap 4.

  The plastic injection material 5 is a gel-like agglomerate instantly by stirring and mixing the liquid A and the liquid B described later and mixing them uniformly, and its shape imparting property is not diluted with running water or the like. Therefore, it is difficult to cause a deviation from the surroundings.

  The plastic injection material 5 injected into the gap 4 flows with its own weight, so that the gap 4 is reliably filled.

  The injection order of the plastic injection material 5 is as shown by the white arrows in FIGS. 4 and 5 after injecting the plastic injection material 5 into the upstream gap 4 and filling the upstream gap 4 as shown in FIG. Then, the plastic injection material 5 is sequentially injected from the filling portion toward the downstream side.

  Although the plastic injecting material 5 is less likely to deviate to the surroundings due to its shape imparting property, the plastic injecting material 5 is swept downstream in the state of agglomerates when the amount of flowing water is large when injected into the running water. There is a fear.

  Therefore, if the plastic injection material 5 is first intensively injected into the upstream gap 4 and the flow of the channel water 3 in the gap 4 is stopped, the plastic injection material 5 injected into the gap 4 is then swept away in a cohesive state. Can be prevented. In addition, the amount of water may be reduced by providing a mold, but since it is not necessary to stop the water, it is only necessary to form a simple mold with a sheet pile, plywood, pile, or the like.

  The filling amount of the plastic injection material 5 may be set to be larger than the amount necessary for filling the gap 4, and unnecessary portions may be excavated and formed into a predetermined shape after filling.

The plastic injection material 5 injected into the gap 4 closes the gap 4 and simultaneously closes the joint 2a of the molded tube 2 as shown in FIG. In this case, the plastic injection material 5 closes the seam 2a in a state where it enters the seam 2a by an appropriate depth without flowing out from the seam 2a into the forming pipe 2 due to its shape imparting property. There is no need to provide a separate work process.
(3) When the filling of the plastic injection material 5 into the gap 4 is completed, a water channel in which the molded pipe 2 in which the water channel water 3 flows is laid is completed.

  In addition to the molded pipe 2 such as a fume pipe, a box culvert shown in FIG. 6 is conceivable as the water channel molded body, and the box culvert is constructed in the same manner as described above. Further, the water channel molded body may have an open structure.

  About injection | pouring to the clearance gap 4 of the plastic injection material 5, when there is much water quantity of an injection | pouring location, as shown by the dashed-two dotted line of FIG. 2, a sheet pile, a plywood, a pile is shown in the boundary part of the filling location of the plastic injection material 5 Alternatively, a simple mold 6 may be provided by using a sandbag or the like to reduce the amount of water at the filling location. In this way, the plastic injection material 5 can be injected more accurately, and the injection work is further facilitated.

  The A liquid used in the method of the present invention is not particularly limited as long as it is cement milk used in the conventional plastic injection material 5. Cement milk is a solution in the form of milk mainly composed of cement and water. As cement, various boltland cements such as normal, early strength, super early strength, white color, sulfate resistance, moderate heat, low heat, etc. It can be selected from a mixed cement obtained by mixing at least one kind of the bolt land cement and at least one kind such as blast furnace slag and fly ash, a special cement such as a jet cement and an alumina cement, a cement-based solidified material, and the like.

  The cement milk may be made into cement air milk by mixing bubbles obtained by foaming a foaming agent as necessary. Further, the specific gravity of the plastic injection material 5 may be adjusted by adding sand, reki, foam beads or the like to cement milk.

  Furthermore, admixtures such as water reducing agents, retarders, and dispersing agents may be added to cement milk as necessary, and even when these admixtures are added, there is almost no effect on plasticity after kneading. No. By adding a water reducing agent, the amount of unit water in cement milk can be reduced or the amount of unit cement can be increased, thereby expanding the range of compounding design for increasing strength and reducing weight. By adding a retarder, it is possible to prevent hardening inside the equipment such as transportation piping and reduce washing of the equipment. Addition of a dispersant improves the fluidity and can extend the transport distance by piping or the like.

  The amount of water added in the cement milk may be in a range in which homogeneous cement milk can be prepared, and is usually in a range of cement: water (weight ratio) = 1: 0.3 to 1: 1.

  The B liquid (plasticizing liquid) used in the method of the present invention is a suspension liquid in which a plasticizing material is dispersed, and various conventionally known plasticizing materials can be used. Specific examples of such plasticizers include pentonite, attapulgite, metakaolin, and the like, and these can be used alone or in combination of two or more.

  The amount of water added in the plasticizing liquid is not particularly limited, but is usually in the range of plasticizer: water (weight ratio) = 1: 6.2 to 1: 7.1.

  There are no particular limitations on the quality of pentonite, attapulgite, metakaolin, or the like used as the plasticizer, and those conventionally used can be appropriately selected and used.

  In addition, by increasing or decreasing the amount of solidified material, it is possible to develop an arbitrary strength, and by setting it to a low strength, excavation is easy even when re-digging for repairing underground structures after backfilling. Can be done.

  In the construction method of the present invention, usually at the construction site, it is pumped to the construction site using piping such as a pipe, and both liquids are mixed immediately before the construction site, instantly plasticized, and injected into the construction site. . In addition, after manufacturing A liquid and B liquid in the manufacturing plant installed in another place instead of the construction site, A liquid and B liquid are conveyed to the construction site using a mixer car etc. Liquid B may be mixed, plasticized instantaneously, and injected into the construction site.

  The mixing ratio of the A liquid and the B liquid is not particularly limited, and may be determined as appropriate so that appropriate plastic performance, curing performance, and the like can be exhibited according to the type of plasticizer contained in the B liquid.

  Also, the B liquid containing the plasticizer can be diluted at the construction site as needed, mixed with the A liquid, plasticized, and injected into the construction site, and a flow value suitable for the construction site depending on the degree of dilution. The plasticizer concentration can be adjusted.

  Further, the flow value of the adjusted plastic injection material 5 is preferably in the range of 80 to 120 mm, and in this range, material separation is extremely reduced even in places where water is poured or running water. In addition, the flow value was based on the cylinder method of the consistency test method of Japan Highway Public Corporation standard "Test method of air mortar and air milk (JHSA 313-1992)". The sample was put in a cylinder having an inner diameter of 8 cm and a height of 8 cm, and the diameter of the bottom surface of the sample after drawing was measured.

  The plastic injection material 5 does not use a plasticizing agent and exhibits plasticity only by the blending technique of the inorganic material.

(A) is a top view which shows the construction process of the repair method of the waterway of this invention, (b) is a cross-sectional view of the construction process. (A) is a top view which shows the construction process of the repair method of the waterway of this invention, (b) is a cross-sectional view of the construction process. (A) is a top view which shows the construction process of the repair method of the waterway of this invention, (b) is a cross-sectional view of the construction process. It is a top view which shows the construction process of the repair method of the waterway of this invention. It is a longitudinal cross-sectional view which shows the construction process of the repair method of the waterway of this invention. It is a cross-sectional view which shows the other construction process of the repair method of the waterway of this invention. It is a top view which shows the construction process of the repair method of the conventional waterway.

Explanation of symbols

1 Water channel 2 Molded pipe (Molded body for water channel)
2a Molded pipe joint 3 Water channel 4 Crevice 5 Plastic injection material

Claims (2)

A plastic injection material obtained by laying a molded body for a water channel in an existing water channel and stirring and mixing the liquid A composed of cement milk and the liquid B composed of a suspension containing a plasticizer, the existing water channel and the water channel Filling the gap by injecting the plastic injection material into the gap formed between the molded article and stopping the flow of water in the gap, and then injecting the plastic injection material into the remaining gap. Waterway repair method characterized by The method for repairing a water channel according to claim 1, wherein a mold is provided at a boundary portion of the filling portion of the plastic injection material to reduce the amount of water in the filling portion.

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