JP6325319B2 - Water leakage repair device and water leakage repair method - Google Patents

Description

  The present invention relates to a water leakage repair device and a water leakage repair method for forming a water shielding layer on an existing concrete structure.

  Conventionally, as a method of shielding the lower surface of the existing revetment concrete, a method of forming an improved soil layer by applying a cement-based deep mixing treatment method to the lower ground of the revetment concrete, or a chemical injection method to the lower ground of the revetment concrete There has been proposed a method of forming a solidified layer by applying the above.

  In these conventional methods, by forming an improved soil layer or solidified layer below the revetment concrete, water leakage from the bottom surface of the revetment concrete is blocked by the improved soil layer or solidified layer to prevent leakage from the revetment concrete. It is for the purpose.

  As a method for applying the cement-based deep mixing treatment method, for example, a water-blocking revetment structure disclosed in Patent Document 1 has been proposed. The impermeable revetment structure disclosed in Patent Document 1 is provided with a pair of steel walls spaced apart, and solidified soil such as viscous soil is packed in the spaces between the steel walls, An improved soil layer is formed below the steel wall by a cement-based deep mixing process.

JP 2002-227166 A

  Here, since the existing revetment concrete is constructed as a revetment wall between the ocean and the ground, there are tide level fluctuations in the ocean, effects of waves, impact force at the time of ship berthing, ground level water level fluctuations, etc. Due to the influence, it is continuously displaced between the ocean and the ground to the ground side or ocean side.

  For this reason, in the impermeable revetment structure disclosed in Patent Document 1, only the existing revetment concrete is constantly displaced to the ground side or the ocean side, resulting in a displacement difference between the bottom surface of the revetment concrete and the improved soil layer. Thus, a water channel is formed at the interface between the bottom surface of the existing revetment concrete and the improved soil layer.

  At this time, the water-impervious revetment structure disclosed in Patent Document 1 is based on the fact that groundwater or the like passes through the interface between the bottom surface of the existing revetment concrete and the improved soil layer, and cracks or the like generated in the existing revetment concrete There was a problem in that groundwater and the like infiltrated into the concrete, and the groundwater flowed out to the ocean side.

  In addition, the water-impervious revetment structure disclosed in Patent Document 1 has a problem in that earth and sand on the lower ground of the existing seawall concrete and the ground on the back side also flow out to the ocean side together with groundwater.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to improve the quality of the water shielding layer formed on the lower surface of the concrete structure, It is an object of the present invention to provide a water leakage repair device and a water leakage repair method capable of reliably blocking water leakage from a concrete structure to the ocean.

A water leakage repair device according to a first aspect of the present invention is a water leakage repair device for forming a water-impervious layer on an existing revetment concrete structure, and is inserted from the outside to the inside of a gap formed below the revetment concrete structure. comprising a support base that is, the support base is at least spray underside water shield material is sprayed device seawall concrete structure, and the barrier spraying state of the water medium which is blown at least on the lower surface of the revetment concrete structure Any one or both of the confirmation devices for confirmation are provided on the upper surface of the main body .

The water leakage repair device according to a second aspect of the present invention is the first aspect of the invention, wherein the spraying device is configured such that a nozzle for ejecting the water shielding material toward at least the lower surface of the seawall concrete structure is fixed to the support base, and the nozzle is It is supported by the said support stand from the bottom face of the said space | gap part.

The water leakage repair device according to a third aspect of the present invention is the water leakage repair device according to the first aspect, wherein the confirmation device projects the water shielding material sprayed on at least the lower surface of the revetment concrete structure, and the water shielding material from the outside of the gap. A mirror for visually confirming is attached to the support base.

  In a water leakage repair device according to a fourth aspect of the present invention, in any one of the first to third aspects, the support base is placed on a rail extending from the outside to the inside of the gap, and along the rail It is a thing which moves.

In the water leakage repair device according to a fifth aspect of the present invention, in any one of the first to third aspects, the support base moves by sliding a curved surface protruding downward on the bottom surface of the gap. It is characterized by that.
According to a sixth aspect of the present invention, in the fifth aspect of the water leakage repair device, the support base is a board type for sliding and moving the curved surface protruding downward on the bottom surface of the gap. And

The water leakage repair method according to the seventh aspect of the present invention is a water leakage repair method for forming a water shielding layer on an existing seawall concrete structure, forming a void under the seawall concrete structure, Using a spraying device in which a nozzle that is ejected toward at least the lower surface of the revetment concrete structure is fixed to the upper surface of the main body of the support base, the support base is inserted from the outside to the inside of the gap portion, and It is characterized by including a first step of spraying a material to at least the lower surface of the revetment concrete structure to form a water shielding layer.

According to an eighth aspect of the present invention, there is provided a water leakage repair method as set forth in the seventh aspect , wherein after the first step, the water shielding material sprayed on at least the lower surface of the revetment concrete structure is viewed from the outside of the gap. Using the confirmation device attached to the upper surface of the main body portion of the support base, the water-impervious material that is sprayed on at least the lower surface of the revetment concrete structure by inserting the support base from the outside to the inside of the gap portion It is characterized by including the 2nd process of confirming the spraying state.

The water leakage repair method according to a ninth aspect of the present invention is that in the eighth aspect of the invention, after the second step, the foam material is foamed and cured in the gap portion, and the foam material is filled in the gap portion. A water permeable layer is provided, and the method includes a third step of bringing the water shielding layer into close contact with the lower surface of the revetment concrete structure with the foam material.

According to 1st invention- 6th invention, while a nozzle is fixed to a support stand so that it may not rock | fluctuate in a height direction etc., while a water shielding material is sprayed uniformly on the lower surface of a concrete structure, By ensuring that the spraying state can be confirmed reliably and easily by the worker, it is possible to improve the quality of the water shielding layer formed on the bottom surface of the concrete structure, thereby reliably blocking water leakage from the existing concrete structure. It becomes possible.

According to the seventh to ninth inventions, even if only the concrete structure is constantly displaced to the ocean side or the ground side, it is not necessary to perform large-scale excavation of the lower ground of the concrete structure. It is possible to prevent leakage of groundwater or the like to the ocean from cracks or the like generated in the structure.

It is a perspective view which shows the concrete structure in which the water leak repair construction method to which this invention is applied is implemented. It is a side view which shows the concrete structure in which the water leak repair construction method to which this invention is applied is implemented. It is a top view which shows the concrete structure in which the water leak repair construction method to which this invention is applied is implemented. It is a side view which shows the concrete structure after the water leak repair construction method to which this invention is applied. It is a perspective view which shows the trolley | bogie type support stand provided with the spraying apparatus of the water leak repair apparatus to which this invention is applied. It is a perspective view which shows the board-type support stand provided with the spraying apparatus of the water leak repair apparatus to which this invention is applied. It is a perspective view which shows the trolley | bogie type support stand provided with the confirmation apparatus of the water leak repair apparatus to which this invention is applied. It is a side view which shows the process of excavating the ground side of a concrete structure in the water leak repair method to which this invention is applied. It is a side view which shows the process of forming a space | gap part under a concrete structure in the water leak repair method to which this invention is applied. It is a side view which shows the process of inserting the trolley | bogie type support stand in which the spraying apparatus was provided in the space | gap part under the concrete structure in the water leak repair method to which this invention is applied. It is an expanded side view which shows the trolley | bogie type support stand provided with the spraying apparatus inserted in the space | gap part under the concrete structure in the water leak repair method to which this invention is applied. It is an expanded rear view which shows the trolley | bogie type support stand provided with the spraying apparatus inserted in the space | gap part under the concrete structure in the water leak repair method to which this invention is applied. It is an enlarged plan view which shows the trolley | bogie type support stand provided with the spraying apparatus inserted in the space | gap part under the concrete structure in the water leak repair method to which this invention is applied. It is a side view which shows the process of forming a water-impervious layer in the lower surface of a concrete structure in the water leak repair method to which this invention is applied. It is a side view which shows the process of confirming the spraying state of the water shielding material sprayed on the lower surface of the concrete structure in the water leak repair method to which this invention is applied. It is an expanded side view which shows the cart type | mold support stand provided with the confirmation apparatus inserted in the space | gap part under the concrete structure in the water leak repair method to which this invention is applied. It is an enlarged side view which shows the board-type support stand provided with the spraying apparatus inserted in the space | gap part under the concrete structure in the water leak repair method to which this invention is applied. It is an enlarged plan view which shows the board-type support stand provided with the spraying apparatus inserted in the space | gap part under the concrete structure in the water leak repair method to which this invention is applied. It is a side view which shows the process of installing a foaming material in the space | gap part below a concrete structure in the water leak repair method to which this invention is applied. It is a side view which shows the process of providing a poorly water permeable layer continuously to a water-impervious layer under a concrete structure in the water leak repair method to which this invention is applied. It is a side view which shows the process of installing a water shielding sheet in the back surface of a concrete structure in the water leak repair method to which this invention is applied.

  Hereinafter, the form for implementing the water leak repair apparatus 1 to which this invention is applied is demonstrated in detail, referring drawings.

  As shown in FIG. 1, the water leakage repair device 1 to which the present invention is applied prevents leakage of water from an existing concrete structure 5 such as revetment concrete constructed as a revetment wall between the ocean and the ground to the ocean. As what it does, it is used in order to form the water-impervious layer 7 in the existing concrete structure 5.

  As shown in FIG. 2, the existing concrete structure 5 is constructed as a wall structure that separates the ocean side A and the ground side B, and a concrete upper part 51 and a concrete lower part 52 erected as a wall body are provided. It is formed integrally. In the existing concrete structure 5, a concrete upper part 51 is constructed so as to have a predetermined wall height in the height direction Y, and a concrete lower part 52 is constructed so as to have a predetermined extension in the depth direction Z.

  As shown in FIG. 3, the existing concrete structure 5 is constructed to have a predetermined extension in the width direction X along the boundary separating the ocean side A and the ground side B, for example, a plurality of steel sheet piles. 53 and a plurality of inclined piles 54 such as H-shaped steel are embedded in the concrete lower part 52. In the existing concrete structure 5, a pair of bellows members 55 such as channel steel is installed by being installed on a plurality of oblique piles 54, and the steel sheet pile 53 and the bellows members 55 are connected by a tie rod 56. .

  As shown in FIG. 4, the existing concrete structure 5 includes a water-impervious layer 7 that blocks intrusion of groundwater and the like into the concrete structure 5 and a ground below the concrete structure 5 after the repair of water leakage. And a hardly water-permeable layer 8 provided continuously below the water-impervious layer 7. In the existing concrete structure 5, a water shielding sheet 57 that blocks water leakage from the concrete structure 5 to the ocean is installed on the back surface 5 b of the ground side B of the concrete structure 5.

  The water shielding layer 7 is provided so as to cover the lower surface 5 a of the concrete structure 5 by spraying the water shielding material 70 onto the lower surface 5 a of the existing concrete structure 5. For the water shielding material 70, a water shielding material such as a rubber asphalt-based waterproofing coating material or a cement-based waterproofing material having elasticity is preferably used. The water shielding material 70 is sprayed on the lower surface 5a of the concrete structure 5 so that water leakage to the ocean due to intrusion of groundwater or the like from the lower surface 5a of the concrete structure 5 is blocked. The water shielding material 70 is not limited to this, and any material such as a water shielding material may be used as long as a predetermined water shielding performance for blocking water leakage is ensured.

  The hardly water-permeable layer 8 is provided in the gap 6 formed in the height direction Y at a height of about 20 cm to 50 cm by excavating the lower ground of the existing concrete structure 5. The hardly water-permeable layer 8 is provided by foaming and curing the foam material 80 in the gap portion 6 and filling the gap material 6 with the foam material 80. The foam material 80 is made of a hardly water permeable material such as hard foamed urethane which has a very small water permeability coefficient after foaming and curing. The foam material 80 is not limited to this, and any material such as a hardly water-permeable material or a water-impervious material may be used as long as it can be filled by being foam-cured in the gap 6.

  The water leakage repair device 1 to which the present invention is applied includes a carriage-type or board-type support base 2, and as shown in FIGS. 5 and 6, a spray device 3 is provided on the support base 2, or As shown in FIG. 7, a confirmation device 4 is provided on the support base 2.

  As shown in FIGS. 5 and 6, the spraying device 3 is made of a fixing member 33 made of metal or the like on the distal end side 2 a of the carriage-type or board-type support base 2 with the nozzle 31 facing upward. Fixed by. In the spraying device 3, a hose 32 connected to a nozzle 31 is fixed to a base end side 2 b of a carriage-type or board-type support base 2 by a fixing member 33 made of metal or the like.

  As shown in FIG. 7, the confirmation device 4 is supported by a support member 43 made of metal or the like on the distal end side 2 a of the support base 2 with the mirror 41 tilted in the depth direction Z with the mirror 41 facing upward. Thus, the mirror 41 is attached to the support base 2. In the confirmation device 4, a lighting device 42 such as a flashlight inclined at a predetermined angle toward the mirror 41 is fixed to the base end side 2 b of the support base 2 by a holding member 45 made of metal or the like. In FIG. 7, the mirror 41 is attached to the carriage-type support base 2, but the mirror 41 may be attached to the board-type support base 2.

  As shown in FIGS. 5 to 7, the support base 2 is provided with the spraying device 3 or the confirmation device 4 on the upper surface of the body portion 21 made of metal or the like, and has a substantially circular cross section or the like extending in the depth direction Z. One end of the rod 26 is attached to the attachment portion 25 on the base end side 2 b of the support base 2.

  As shown in FIGS. 5 and 7, when the support base 2 is a carriage type, the main body portion 21 is formed in a substantially rectangular shape or the like, and four wheel portions 22 are provided below the main body portion 21. Is attached. At this time, the support base 2 is configured such that the wheel portion 22 is placed inside a rail 23 made of metal or the like provided at a predetermined interval in the width direction X, and the wheel portion 22 is rotated to rotate the rail 23. The main body 21 moves substantially linearly in the depth direction Z.

  As shown in FIG. 6, when the board 2 is used as the support base 2, a curved surface 21 a that protrudes downward at the lower portion of the main body portion 21 is formed. At this time, the support base 2 slides on the curved surface 21a, so that the main body 21 moves in a substantially straight line at an arbitrary angle with respect to the depth direction Z.

  The water leakage repair method to which the present invention is applied is carried out for repairing water leakage from the existing concrete structure 5 to the ocean, as shown in FIGS. 8 to 21, and in particular, the existing concrete structure. 5 is for forming the water shielding layer 7.

  The water leakage repair method to which the present invention is applied includes a first step of forming a water shielding layer 7 by spraying a water shielding material 70 on at least the lower surface 5a of the existing concrete structure 5. Furthermore, the water leakage repair method to which the present invention is applied is a second step of confirming the spraying state of the water shielding material 70 sprayed on at least the lower surface 5a of the existing concrete structure 5 as necessary, or the foam material 80. A third step of bringing the water shielding layer 7 into close contact with the lower surface 5a of the existing concrete structure 5 is provided.

  First, as shown in FIG. 8, the water leakage repair method to which the present invention is applied excavates the ground side B of the existing concrete structure 5 in the height direction Y, and removes the earth and sand below the concrete lower part 52. Then, the back surface 5b of the ground side B of the concrete structure 5 is exposed.

  Next, in the water leakage repair method to which the present invention is applied, as shown in FIG. 9, the water in the depth direction Z is passed through the ground below the concrete structure 5 from the ground side B of the concrete lower part 52 toward the ocean side A. While excavating with a jet, the mud is collected with a vacuum device.

  At this time, in the first step, the water leakage repair method to which the present invention is applied forms the gap 6 below the concrete structure 5. The gap 6 is formed with a gap height H of about 20 cm to 50 cm without increasing the amount of excavation of the ground below the concrete structure 5 and without an operator entering the concrete structure 5. .

  Next, in the water leakage repair method to which the present invention is applied, in the first step, as shown in FIG. 10, the nozzle 31 for ejecting the water shielding material 70 supplied from the hose 32 upward is fixed to the support base 2. As a result, the spraying device 3 is provided on the carriage-type support base 2. The support 2 is placed on a rail 23 that extends substantially linearly in the depth direction Z from the outside to the inside of the gap 6 and is inserted from the outside to the inside of the gap 6. The support base 2 moves in a substantially straight line along the rail 23 by being pushed or pulled out in the depth direction Z of the gap portion 6 after the worker grips the other end of the push-out pull-out rod 26. .

  At this time, as shown in FIG. 11, the water leakage repair method to which the present invention is applied is that the concrete structure 5 above the rail 23 is in a state where the nozzle 31 is supported from the bottom surface 6 a of the gap portion 6 by the support base 2. The water shielding material 70 is ejected from the nozzle 31 toward the lower surface 5a. The spraying device 3 swings in the height direction Y when the nozzle 31 is fixed to the support base 2 and the reaction force is obtained from the bottom surface 6a of the gap 6 to eject the water shielding material 70 from the nozzle 31. The nozzle 31 is fixed so as not to occur. Thus, in the spraying device 3, the nozzle 31 is fixed to the support base 2 by the fixing member 33, and the nozzle 31 is restrained so as not to swing in the width direction X and the depth direction Z.

  As shown in FIG. 12, the water leakage repair method to which the present invention is applied is provided with a water shielding effect on the lower surface 5 a of the concrete structure 5 by moving along the rail 23 in a state where the support 2 is constrained in the width direction X. The material 70 is sprayed uniformly in the width direction X. As shown in FIG. 13, the water leakage repair method to which the present invention is applied is drawn onto the lower surface 5 a of the concrete structure 5 by the support base 2 being drawn and moved along the rail 23 at a substantially constant speed in the depth direction Z. The water shielding material 70 is sprayed uniformly in the depth direction Z.

  As shown in FIG. 14, the water leakage repair method to which the present invention is applied is a concrete structure above the rail 23 by fixing the nozzle 31 so as not to swing in the height direction Y or the like, as shown in FIG. The water shielding material 70 is sprayed uniformly on the lower surface 5a of the water 5 to form the water shielding layer 7 that blocks leakage of groundwater and the like from the concrete structure 5 to the ocean.

  In addition, the water shielding material 70 may be sprayed to the substantially vertical part of the depth of the space | gap part 6 by changing the direction of the nozzle 31 to substantially horizontal. Thereby, the water-impervious layer 7 is also provided on the ground on the ocean side A of the gap 6 formed below the concrete structure 5. Furthermore, it is preferable that the water shielding material 70 is sprayed also on the back surface 5 b of the ground side B of the concrete lower part 52.

  Next, in the second step, the water leakage repair method to which the present invention is applied is such that, as shown in FIG. 15, the mirror 41 inclined upward in the depth direction Z is attached to the support base 2, thereby A confirmation device 4 is provided on the support 2. The support 2 is placed on a rail 23 that extends substantially linearly in the depth direction Z from the outside to the inside of the gap 6 and is inserted from the outside to the inside of the gap 6. The support base 2 moves in a substantially straight line along the rail 23 by being pushed or pulled out in the depth direction Z of the gap portion 6 after the worker grips the other end of the push-out pull-out rod 26. .

  At this time, in the water leakage repair method to which the present invention is applied, the water blocking material 70 sprayed onto the lower surface 5a of the concrete structure 5 is projected on the mirror 41 as shown in FIG. The water-impervious material 70 is visually recognized from the outside, and the spraying state of the water-impervious material 70 sprayed on the lower surface 5a of the concrete structure 5 is confirmed. Since the gap portion 6 is formed as a closed space below the concrete structure 5, the lighting device 42 illuminates the mirror 41 to brighten it, so that the operator can change the sprayed state of the water shielding material 70 to the outside of the gap portion 6. Therefore, it can be clearly confirmed.

  As shown in FIGS. 12 and 13, the water leakage repair method to which the present invention is applied uses a spraying device 3 provided on a cart-type support base 2 as shown in FIGS. The water-blocking material 70 is sprayed uniformly on the lower surface 5a, and the spraying state of the water-blocking material 70 is confirmed using the confirmation device 4 provided on the carriage-type support base 2 as shown in FIG. . In the water leakage repair method to which the present invention is applied, while the rail 23 is sequentially moved in the width direction X in the gap 6, the spraying work and the confirmation work of the water shielding material 70 are repeated, so that the predetermined range in the width direction X is obtained. The water shielding layer 7 can be formed on the lower surface 5 a of the concrete structure 5.

  In the water leakage repairing method to which the present invention is applied, the gap 6 is formed below the concrete structure 5 and, if necessary, as shown in FIG. 2 is used. The support base 2 is inserted from the outside to the inside of the gap portion 6 by sliding the curved surface 21 a of the main body portion 21 on the bottom surface 6 a of the gap portion 6. In the state where the nozzle 31 is supported from the bottom surface 6 a of the gap 6 by the support 2, the water shielding material 70 is ejected toward the lower surface 5 a of the concrete structure 5. When the nozzle 31 is fixed to the support base 2 and the reaction force is obtained from the bottom surface 6a of the gap 6 to cause the water shielding material 70 to be ejected from the nozzle 31, the spraying device 3 swings in the height direction Y or the like. The nozzle 31 is fixed so as not to move.

  As shown in FIG. 18, the water leakage repairing method to which the present invention is applied uses the board-type support base 2 provided with the spraying device 3, so that even on the back side of the obstacle such as the slant pile 54, It becomes possible to spray the water shielding material 70 on the lower surface 5 a of the concrete structure 5. At this time, the support base 2 is pushed in the depth direction Z of the gap portion 6 after the operator grips the other end of the push-out pull-out rod 26, and further tilted obliquely to the main body portion at the bottom surface 6 a of the gap portion 6. By sliding 21, the main body 21 moves in a substantially straight line at an arbitrary angle with respect to the depth direction Z. Note that the water leakage repair method to which the present invention is applied uses the board-type support base 2 provided with the confirmation device 4 so that the sprayed state of the water shielding material 70 sprayed on the lower surface 5a of the concrete structure 5 is inclined. It can also be confirmed on the back side of an obstacle such as a pile 54.

  In the water leakage repair method to which the present invention is applied, the water blocking material 70 can be sprayed locally by using the board-type support base 2 provided with the spraying device 3 and the confirmation device 4, and the spraying state is Since it can confirm locally, the partial rework work of water leak repair is easily implement | achieved, and it becomes possible to implement water leak repair of the existing concrete structure 5 efficiently.

  As shown in FIG. 19, in the third step, the water leakage repair method to which the present invention is applied is the gap 6 below the concrete structure 5 in order from the ocean side A to the ground side B of the gap 6. The foam material 80 before foam curing is installed below the water shielding layer 7. At this time, the foam material 80 is installed while the two-liquid mixing hose 81 or the like is inserted from the ground side B into the gap 6 and the two liquids are mixed in the gap 6. Here, 2 liquid mixing is what mixes the 1st liquid containing a polyisocyanate component and the 2nd liquid containing a polyol component, for example.

  As shown in FIG. 20, the water leakage repair method to which the present invention is applied is difficult by foaming the foam material 80 in the gap portion 6 by two-liquid mixing or the like and curing the foam material 80 in the gap portion 6. A water permeable layer 8 is provided. At this time, when the foam material 80 expands, the water-impervious layer 7 is pressed from below to the hardly water-permeable layer 8 continuously provided below the water-impervious layer 7. This is in close contact with the lower surface 5a.

  Finally, as shown in FIG. 21, the water leakage repair method to which the present invention is applied is a predetermined method for blocking infiltration of groundwater or the like into the concrete structure 5 on the back surface 5b of the ground side B of the concrete structure 5. A water shielding sheet 57 having a water shielding performance is installed. Furthermore, in the water leakage repair method to which the present invention is applied, as shown in FIG. 4, the ground side B of the concrete structure 5 is backfilled to complete the water leakage repair work for the existing concrete structure 5.

  When the water permeable material is used for the foam material 80 or when earth or sand is backfilled in the gap portion 6, the concrete structure 5 is located above the gap portion 6 in a state where ground groundwater has entered the gap portion 6. The groundwater level will be set in At this time, in the concrete structure 5, upward groundwater pressure due to a height difference from the groundwater level above the gap 6 to the water shielding layer 7 acts on the water shielding layer 7.

  On the other hand, in the concrete structure 5, since the water-permeable material or the like is used for the foam material 80, the groundwater hardly penetrates into the gap 6, so that the water-impervious layer 8 is formed from the groundwater level above the gap 6. Due to the height difference to the lower end, a larger upward groundwater pressure acts from below the hardly permeable layer 8.

  The concrete structure 5 is made of a hardly permeable material or the like used as the foam material 80, thereby causing a larger upward groundwater pressure to act on the hardly permeable layer 8 and impermeable to water due to the upward groundwater pressure acting on the hardly permeable layer 8. Since the layer 7 is provided in close contact with the lower surface 5 a of the concrete structure 5, it is possible to prevent the water shielding material 70 from being peeled off.

  In the water leakage repair method to which the present invention is applied, the water shielding material 70 is sprayed on the lower surface 5a of the concrete structure 5 from the gap portion 6 formed in a narrow range, so as to reduce the amount of excavation at the time of water leakage repair. In the water leakage repairing method to which the present invention is applied, the water-impervious layer 7 is filled with the foam material 80 in the narrow space 6 to form the water shielding layer 7 on the lower surface 5a of the concrete structure 5 in spite of the narrow space. It becomes possible to adhere to.

  The water leakage repair method to which the present invention is applied is such that even when only the concrete structure 5 is constantly displaced to the ocean side A or the ground side B, the water shielding layer 7 is brought into close contact with the lower surface 5a of the concrete structure 5. In addition, it is possible to prevent water from forming on the lower surface 5a of the concrete structure 5, and to prevent sediment from flowing out due to outflow of groundwater or the like from the lower ground or the back side ground of the concrete structure 5. .

  As a result, the water leakage repair method to which the present invention is applied prevents the outflow of earth and sand accompanying the outflow of groundwater or the like from the lower ground or the back side ground of the concrete structure 5 and reduces the supporting force of the concrete structure 5 by the ground. Can not be.

  In addition, the water leakage repair method to which the present invention is applied is a double barrier between the water-impervious layer 7 on the lower surface 5a of the existing concrete structure 5 and the hardly water-permeable layer 8 provided continuously below the water-impervious layer 7. By introducing the water structure, the water leakage prevention performance of the concrete structure 5 can be remarkably improved.

  Furthermore, the water leakage repair method to which the present invention is applied can introduce a double water-impervious structure of the water-impervious layer 7 and the hardly water-permeable layer 8 only by forming the gap 6 below the concrete structure 5. For this reason, it is possible to easily provide the concrete structure 5 with a significantly improved water leakage prevention performance while reducing the amount of excavation at the time of water leakage repair and improving work efficiency and safety.

  As shown in FIG. 14, the water leakage repair device 1 to which the present invention is applied has the nozzle 31 fixed to the carriage-type support base 2 so as not to swing in the height direction Y or the like. It is possible to uniformly spray the water shielding material 70 on the lower surface 5a of the water to form the water shielding layer 7 without unevenness. Further, as shown in FIG. 15, the water leakage repair device 1 to which the present invention is applied has a carriage-type support base 2 mounted on a rail 23 that extends substantially linearly in the depth direction Z from the outside to the inside of the gap 6. Since the worker can easily grasp the position visually recognized by the highly visible mirror 41, the sprayed state of the water shielding material 70 can be reliably and easily confirmed from the outside of the gap portion 6. It becomes possible to do.

  Accordingly, the water leakage repair device 1 to which the present invention is applied does not require large-scale excavation of the lower ground of the existing concrete structure 5, and the water shielding layer 7 formed on the lower surface 5 a of the existing concrete structure 5. Thus, it is possible to reliably block water leakage from the existing concrete structure 5 to the ocean.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

DESCRIPTION OF SYMBOLS 1: Leak repair apparatus 2: Support stand 2a: Tip side 2b: Base end side 21: Main body part 21a: Curved surface 22: Wheel part 23: Rail 25: Mounting part 26: Push-out extraction rod 3: Spraying device 31: Nozzle 32 : Hose 33: Fixing member 4: Confirming device 41: Mirror 42: Lighting device 43: Supporting member 45: Holding member 5: Concrete structure 5a: Lower surface 5b: Back surface 51: Concrete upper part 52: Concrete lower part 53: Steel sheet pile 54: Slanted pile 55: Raised material 56: Tie rod 57: Water-impervious sheet 6: Cavity 6a: Bottom surface 7: Water-impervious layer 70: Water-impervious material 8: Hard water-permeable layer 80: Foam 81: Two-component mixing hose A: Ocean side B: Ground side X: Width direction Y: Height direction Z: Depth direction

Claims (9)

A water leakage repair device for forming a water-impervious layer on an existing revetment concrete structure,
Provided with a support base inserted from the outside to the inside of the gap formed below the revetment concrete structure,
The support base is at least spray underside water shield material is sprayed device seawall concrete structure, and, the confirmation device for confirming the barrier spraying state of the water medium which is blown at least on the lower surface of the revetment concrete structure One or both of them is provided on the upper surface of the main body, and the water leakage repair device. In the spraying device, a nozzle for ejecting the water shielding material toward at least the lower surface of the revetment concrete structure is fixed to the support base, and the nozzle is supported from the bottom surface of the gap by the support base. The water leakage repair device according to claim 1, wherein the device is a water leakage repair device. The confirmation device projects that the water shielding material sprayed on at least the lower surface of the revetment concrete structure is projected, and a mirror for visually recognizing the water shielding material from the outside of the gap is attached to the support base. The water leakage repair device according to claim 1, wherein the device is a water leakage repair device. The said support stand is mounted on the rail extended toward the inner side from the outer side of the said space | gap part, and moves along the said rail. The Claim 1 characterized by the above-mentioned. Leak repair equipment. The water leakage repair device according to any one of claims 1 to 3, wherein the support base moves by sliding a curved surface protruding downward on the bottom surface of the gap. The water leakage repair device according to claim 5, wherein the support base is a board type for sliding and moving the curved surface protruding downward on the bottom surface of the gap. A water leakage repair method for forming a water-impervious layer on an existing revetment concrete structure,
To form a void portion beneath the revetment concrete structure, using a spray device nozzle for ejecting toward the Saegimizuzai at least the lower surface of the revetment concrete structure is fixed to the upper surface of the support base of the main body, the A water leakage repair method comprising a first step of inserting the support base from the outside to the inside of the gap and spraying the water shielding material onto at least the lower surface of the revetment concrete structure to form a water shielding layer. After the first step, a confirmation device in which a mirror for visually recognizing the water shielding material sprayed onto at least the lower surface of the revetment concrete structure is attached to the upper surface of the main body of the support base. A second step of inserting the support base from the outside to the inside of the gap portion and confirming the sprayed state of the water shielding material sprayed on at least the lower surface of the revetment concrete structure. The water leakage repair method according to claim 7 . After said second step, is cured with foaming the foam material in the gap portion, wherein the foam material impermeable layer is provided by filling the air gap portion, revetment concrete structure in the foam material The water leakage repairing method according to claim 8 , further comprising a third step of bringing the water shielding layer into close contact with the lower surface of the water leakage barrier.

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