Method for repairing a dry-stone structure and dry-stone structure

Abstract

Provided are a repair method for a stone retaining structure and a stone retaining structure constructed using the repair method, in which a base material is filled in a hole formed by a stone falling out from a base portion with a sufficient size, and the base material can be firmly meshed with an existing stone forming the inner surface of the hole. 【Solution means】A cloth formwork 6 that can expand three-dimensionally is laid in a hole 5 of a base portion 2 in a sheet state. Next, flowing underwater concrete 7 is injected into the cloth formwork 6 to expand the cloth formwork 6, and the cloth formwork 6 expanded by the underwater concrete 7 is filled in the hole 5 as a base material and is made to enter between existing stones 20 forming the inner surface of the hole 5.

Description

Technical Field

[0001] The present invention relates to a method for repairing a rubble-mound structure and a rubble-mound structure.

Background Art

[0002] Examples of rubble-mound structures include breakwaters, revetments, and mooring quays. As shown in Patent Document 1, some rubble-mound structures are constructed by stacking rubble to form a base portion and covering the slope of the base portion with a layer of covering stones. By using such a rubble-mound structure, the covering stone layer prevents the suction of the rubble in the base portion and protects against waves hitting from the open sea due to its stable structure.

[0003] By the way, as shown in Patent Document 2 (Figs. 3 and 11), in some rubble-mound structures, an underwater structure (such as a caisson) as a gravity structure is constructed on the base portion (top surface) formed by stacking rubble to build breakwaters, mooring quays, revetments, etc. (see also Patent Document 1

[0002] ). In such a rubble-mound structure, as also shown in Patent Document 2

[0002] , due to scouring caused by water flow, waves, etc., the rubble in the base portion may scatter and wash away. If this is left unattended, it will lead to the expansion, elongation, and even deepening of the holes, and damage the stability of the gravity structure. Therefore, when scattering and washing away of the rubble are observed in the base portion, repairs are carried out. As a repair method, it is generally carried out to fill the repair location (inside the hole in the base portion) with a base material (rubble) by a ship from the sea.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, as a method for repairing the missing holes of the riprap in the base part, when backfilling the missing holes with a base material, if a base material larger than the opening of the missing hole is used, it cannot be inserted into the missing hole, and a relatively small base material that can be inserted into the missing hole must be used. For this reason, a base material of such a size cannot be meshed with the existing riprap forming the inner surface of the missing hole. Furthermore, after the riprap has come out, it is difficult to mesh the base material with the existing riprap forming the inner surface of the missing hole afterwards. In backfilling the base material, it is substantially impossible to mesh the base material with the existing riprap. Therefore, in a riprap structure repaired in this way, the riprap in the base part cannot be firmly integrated with each other, and due to new scouring etc. caused by water flow, waves, etc., the backfilled base material will scatter and wash away, causing it to come out, and re-repair will be required.

[0006] The present invention has been made in consideration of the above circumstances. The first object is to provide a method for repairing a riprap structure in which a base material is filled into a missing hole formed by a riprap coming out from a base part with a sufficient size, and the base material can be firmly meshed with the existing riprap forming the inner surface of the missing hole. The second object is to provide a riprap structure constructed using the above repair method.

[0007] In order to achieve the first object, the present invention has the following configurations (1) to (2).

[0008] (1) A method for repairing a riprap structure in which a riprap has come out from a base part constructed with riprap, and a missing hole has been formed in the base part In Lay a flexible sheet formwork that can expand three-dimensionally in a non-three-dimensional state in the missing hole. Next, inject a curable material in a fluid state into the flexible sheet formwork to expand the flexible sheet formwork with the curable material. The flexible sheet formwork inflated by the hardening material is filled into the through-hole as a base material and is made to enter between the existing riprap stones forming the inner surface of the through-hole. a case where a plurality of flexible sheet molding frames are prepared, and for each flexible sheet molding frame, a laying process of the flexible sheet molding frame in the through hole and an injection process of the curable material in the fluid state are sequentially performed, so that a plurality of flexible sheet molding frames inflated by the curable material are formed in the through hole. Adjacent ones of the plurality of flexible sheet molding frames inflated by the curable material are connected by inserting a connecting bar into the curable material in both flexible sheet molding frames, taking advantage of the fact that the curable material in both flexible sheet molding frames is uncured. It is configured as such.

[0009] According to this configuration, if the flexible sheet formwork is laid in the through-hole in a non-three-dimensional state and a fluid hardening material is injected into the flexible sheet formwork to inflate the flexible sheet formwork, the flexible sheet formwork inflated by the hardening material can be inserted into the through-hole as a sufficiently large one exceeding the opening of the through-hole. Furthermore, by utilizing the fluidity (deformability) of the hardening material in the flexible sheet formwork, the flexible sheet formwork inflated by the hardening material is made to fit between the existing riprap stones forming the inner surface of the through-hole and enter the gap between the existing riprap stones. After the hardening of the hardening material, the flexible sheet formwork containing the hardening material can be firmly meshed with the existing riprap stones with the flexible sheet formwork as a base material. Therefore, it is possible to provide a method for repairing a riprap structure in which a base material can be filled into the through-hole formed by the riprap stones coming out from the base part with a sufficient size and the base material can be firmly meshed with the existing riprap stones. Of course, in this case, since the base material, which is a flexible sheet formwork containing the hardening material, can be filled into the through-hole with a sufficient size, stability can be ensured by the weight of the base material.

[0010] Also, The configuration of (1) above in A plurality of the flexible sheet formworks are prepared, and for each of the flexible sheet formworks, the laying process of the flexible sheet formwork in the through-hole and the injection process of the fluid hardening material are sequentially performed. As a result, a plurality of flexible sheet formworks inflated by the hardening material are formed in the through-hole. Adjacent ones of the plurality of flexible sheet formworks inflated by the hardening material are connected by inserting a connecting bar into the hardening material in both of the flexible sheet formworks, taking advantage of the fact that the hardening material in both of the flexible sheet formworks is not yet hardened. from this, a plurality of flexible sheet molding frames inflated by the curable material can be accommodated in the through hole in an integrated state as a base material, and it is possible to accurately cope with the repair of through holes of various sizes.

[0011] (2) Under the configuration of (1) above, as each flexible sheet molding frame, a cloth molding frame using a cloth material having air permeability and water permeability, being stretchable, and ensuring a predetermined strength as a flexible sheet material is used.

[0012] In order to achieve the second object, the present invention has the following configuration (3).

[0013] (3) In a rubble structure provided with a base portion built with rubble, a flexible sheet formwork inflated by storing a hardening material is provided in a part of the base portion, the flexible sheet formwork inflated by storing the hardening material enters between the existing rubble around the flexible sheet formwork, and the flexible sheet formwork inflated by storing the hardening material meshes with the existing rubble A case where a plurality of flexible sheet molding frames inflated by storing the curable material are provided in a part of the base portion. Adjacent ones of the plurality of flexible sheet molding frames inflated by storing the curable material are connected by inserting a connecting bar into the curable material in both flexible sheet molding frames, taking advantage of the fact that the curable material in both flexible sheet molding frames is uncured. configured as such.

[0014] According to this configuration, a rubble structure repaired by the method (1) described above can be provided. Moreover, when constructing a rubble structure, if a flexible sheet formwork storing a hardening material is used from the beginning in a part of the base portion, a rubble structure with enhanced strength of the base portion can be constructed quickly.

Effect of the Invention

[0015] According to the present invention, it is possible to provide a method for repairing a rubble structure in which a base material is filled into a hole formed by the extraction of rubble from the base portion with a sufficient size, and the base material can be firmly meshed with the existing rubble forming the inner surface of the hole. Further, a rubble structure constructed using the above repair method can be provided. When constructing a rubble structure, if a flexible sheet formwork storing a hardening material is used from the beginning in a part of the base portion, a rubble structure with enhanced strength of the base portion can be constructed quickly.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

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Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the rubble structure will be described. Rubble structures include breakwaters, revetments, mooring quays, etc. As an example, in the present embodiment, a caisson-type mooring quay 1 as shown in FIG. 1 is shown. The mooring quay 1 is a structure where a ship directly comes to shore and is moored among the mooring facilities such as a quay wall, a jetty, a dolphin, a floating jetty, a cargo handling area, etc. The mooring quay 1 includes a base portion 2 (foundation mound), a caisson 22 as an underwater structure placed on the top surface 2a (upper surface) of the base portion 2, a backfill stone arrangement area 23 and a backfilled soil arrangement area 24 that support the back surface of the caisson 22, an upper concrete 25 arranged on the upper part of the caisson 22, and an apron paving portion 26 provided behind the upper concrete 25.

[0018] The base portion 2 is constructed by stacking a large number of riprap stones 20 from the foundation ground surface BG in order to stabilize the mooring quay 1 below the water surface W. The top surface 2a of the base portion 2 is formed as a flat surface that extends long toward the side away from the land (seaward side: left side in FIG. 1) as is known. As the riprap stones 20, general ones (for example, 10 to 500 kg / piece) are used, and the riprap stones 20 are exposed on the top surface 2a of the base portion 2. The caisson 22 is a large box formed using concrete or steel. The inside of this caisson 22 is filled with backfill material 27, and the side surface 22a facing the seaward side of the caisson 22 is configured as a quay wall surface.

[0019] The riprap placement area 23 is an area where the riprap is placed in a filled state, and the backfill soil placement area 24 is an area where the backfill soil is provided. The riprap placement area 23 supports the entire back surface of the caisson 22, and the upper surface of the riprap placement area 23 is inclined downward as it moves away from the caisson 22. The backfill soil placement area 24 is located above the riprap placement area 23, and its upper part extends above the caisson 22 while forming the upper surface of the mooring quay 1. A sand control sheet 28 is provided between the riprap placement area 23 and the backfill soil placement area 24.

[0020] The upper concrete 25 is provided on the upper side of the caisson 22, on the quay wall surface side rather than the upper tip of the backfill soil placement area 24. While the upper surface of the upper concrete 25 forms the flat upper surface of the mooring quay 1, the side surface 25a facing the seaward side is continuous with the side surface 22a of the caisson 22 and cooperates with the side surface 22a to form the quay wall surface. Accordingly, a mooring bent column 29 is provided on the upper surface of the upper concrete 25, and a fender 30 is provided on the side surface 25a of the upper concrete 25. The apron paving portion 26 extends a certain length from the upper concrete 25 toward the back side (land side (right side in FIG. 1)), and its upper surface is made the same as the upper surface of the mooring quay 1 by replacing a part of the upper part of the backfill soil placement area 24.

[0021] In such a mooring quay 1, on the top surface 2a of the base portion 2, as shown in FIG. 2, the riprap 20 may come out and a hole 5 may be formed in the base portion 2. It is considered that the riprap 20 scatters and is washed away due to scouring by water flow, waves, etc. If such a hole 5 is left unattended, as shown by the phantom line in FIG. 1, the hole area 5A will further expand, extend, and deepen, impairing the stability of the caisson 22. Therefore, in order to prevent such a phenomenon, it is necessary to repair the base portion 2 at the stage when the hole 5 is generated.

[0022] The repair method according to the present embodiment (first embodiment) is designed to prevent the above-mentioned phenomenon and minimize the need for re-repair after repair. Therefore, in the repair method according to the present embodiment, as shown in FIG. 3, a preparation step, a laying step of a fabric formwork, and an injection step of underwater concrete are carried out in sequence.

[0023] In the preparation step, the state of the hole 5 is examined, and a fabric formwork 6 as a flexible sheet formwork corresponding to the hole 5 (see FIGS. 6 to 8 described later) and underwater concrete 7 as a hardening material are prepared. This is because the underwater concrete 7 injected into the fabric formwork 6 is to be accommodated in the hole 5 as a repair base material, and the fabric formwork 6 and the underwater concrete 7 need to be used in a state adapted to the state of the hole 5. Therefore, first, the state of the hole 5 is examined. At this time, the diameter, area, depth of the hole 5, the inner peripheral surface 5b of the hole 5 (the surface rising from the inner bottom surface 5a among the inner surfaces and formed by the existing riprap 20), the inner diameter of the opening, the internal shape, etc. are collected and measured. Then, from this information, the internal volume of the hole 5, the required weight and the required volume (required injection amount) of the base material (underwater concrete 7) are calculated. Specifically, the internal volume of the hole 5 is calculated (approximate value) using the state information (measurement values) of the hole 5, and the required weight of the underwater concrete 7 is calculated based on the internal volume and Scrap stone 20 its specific gravity (for example, 2.65 g / cm 3 ). Then, based on the required weight of the underwater concrete 7 and its specific gravity (for example, 2.5 t / m3 ) According to this, the injection amount (volume) of underwater concrete 7 is calculated.

[0024] The fabric formwork 6 to be prepared basically has an internal space into which the underwater concrete 7 is to be injected, and has a swelling function as the flowing underwater concrete 7 is injected into the internal space. For this reason, in this embodiment, a fabric material having air permeability, water permeability, being stretchable and ensuring a predetermined strength is used for the fabric formwork 6, and high-strength synthetic fibers (for example, polyester) are used for the formation of the fabric material. In this embodiment, a fabric material using polyester fibers as the high-strength synthetic fibers, having a tensile strength of 350 (kgf / 3 cm), an elongation of 16 (%), and a tear strength of 80 (kgf) is used.

[0025] A more specific description of the fabric formwork 6 will be given. As shown in FIGS. 4 and 5, the fabric formwork 6 is composed of a lower surface portion 6a, an upper surface portion 6b located above the lower surface portion 6a, and a side surface portion 6c connecting the peripheral edges of the upper surface portion 6b and the lower surface portion 6a using the fabric material. These can form an internal space 6d (see FIG. 5). And in this internal space 6d, underwater concrete 7 can be injected through a fabric injection port (formed by combining fabric materials) 8 sewn to the upper surface portion 6b. Therefore, when the underwater concrete 7 is not injected into the fabric formwork 6, the upper surface portion 6b shrinks so as to overlap the lower surface portion 6a. Along with this, the side surface portion 6c is folded (half-folded) near the approximate center in the vertical direction and can protrude outside the upper surface portion 6b and the lower surface portion 6a, and the fabric formwork 6 can be in a sheet-like state as a non-solid (see FIG. 4). On the other hand, when the flowing underwater concrete 7 is injected into the fabric formwork 6, accordingly, the upper surface portion 6b separates from the lower surface portion 6a while the side surface portion 6c bulges, and the fabric formwork 6 becomes a three-dimensional state. In the present embodiment, the upper surface portion 6b and the lower surface portion 6a of the fabric formwork 6 are formed in a rectangular shape, and the corresponding side portions of the upper surface portion 6b and the lower surface portion 6a are connected via the side surface portion 6c. When the fabric formwork 6 becomes three-dimensional, it basically tries to extend upward to form a rectangular parallelepiped shape. At this time, under the influence of the injection of the underwater concrete 7, the side surface portion 6c bulges outward. The arrow in FIG. 5 indicates that mainly the side surface portion 6c bulges outward when the fabric formwork 6 tries to become three-dimensional.

[0026] When selecting the fabric formwork 6 to be prepared, as described above, the state content of the escape hole 5 is referred to. Specifically, the accommodation capacity satisfies the requirement of the necessary injection amount of the underwater concrete 7, the lower surface portion 6a has a size that covers the entire inner bottom surface 5a of the escape hole 5, and when the underwater concrete 7 is injected into the fabric formwork 6 to expand the fabric formwork 6, the side surface portion 6c presses against the inner peripheral surface 5b of the escape hole 5, etc. are considered.

[0027] As the underwater concrete 7 to be prepared, as a composition, it contains known materials such as cement, water, sand (fine aggregate), gravel (coarse aggregate), admixtures, etc., and its specific gravity is close to the specific gravity of the discarded stones 20 (for example, 2.65 g / cm 3 ). The value of ) (for example, 2.5 t / m 3 ) is selected. Even when using the cloth formwork 6 containing the underwater concrete 7, as long as it is filled into the escape hole 5, it will have almost the same volume and almost the same weight as the escaped discarded stones 20, and it can be visually grasped that the required weight is satisfied from the perspective of the stability of the mooring quay 1 (simplification of work). This is effective when, due to the large scale of the escape hole 5, a plurality of cloth formwork 6 containing the underwater concrete 7 must be accommodated in the escape hole 5 as the base material. By using a cloth formwork 6 with a clearly known weight (standard product) containing the underwater concrete 7 and filling the escape hole 5, even if the escape hole 5 is large, the required weight for the escape hole 5 will be ensured.

[0028] However, in the future, it is considered that with climate change and the like, strengths and stabilities exceeding the previous assumed standards may be required. At that time, as the aggregate of the underwater concrete 7, those with a higher specific gravity than the previous standard ones can be used to make the specific gravity of the underwater concrete 7 higher than before (exceeding the specific gravity of the discarded stones 20 (for example, 2.65 g / cm 3 )). Thereby, just by making the required volume to be accommodated in the escape hole 5 the same, the weight can be increased compared to the previous weight (required weight), and the strength and stability can be enhanced.

[0029] When the preparation process is completed, as shown in FIGS. 3 and 6, the laying process of the cloth formwork 6 is executed. Regardless of the size of the opening of the escape hole 5, in the subsequent process, a base material (cloth formwork 6 containing underwater concrete 7) larger than the opening of the escape hole 5 can be filled into the escape hole 5, and the base material can be accurately meshed with the existing riprap 20 forming the inner surface of the escape hole 5. For this reason, the sheet-like cloth formwork 6 is laid so that its lower surface portion 6a covers the inner bottom surface 5a of the escape hole 5. At this time, it is preferable to raise the semi-folded side surface portion 6c protruding from the upper surface portion 6b and the lower surface portion 6a along the inner peripheral surface 5b of the escape hole 5. This is for smoothly expanding and inflating the cloth formwork 6 as the underwater concrete 7 is injected in the subsequent underwater concrete 7 injection process. Moreover, at this time, the semi-folded side surface portion 6c may be held as it is along the riprap 20 on the inner peripheral surface 5b of the escape hole, but it is more preferable to temporarily fix it with an adhesive or the like. This is to prevent the semi-folded side surface portion 6c from falling down and separating from the inner peripheral surface 5b of the escape hole 5.

[0030] When the laying process of the cloth formwork 6 is completed, as shown in FIGS. 3 and 7, the injection process of the underwater concrete 7 is executed. By injecting the underwater concrete 7 into the cloth formwork 6, the cloth formwork 6 is expanded three-dimensionally, and the cloth formwork 6 containing the underwater concrete 7 is filled into the escape hole 5 as a base material. At the same time, the cloth formwork 6 containing the underwater concrete 7 is made to enter the gap 2aa between the existing ripraps 20 forming the inner surface of the escape hole 5 by utilizing the fluidity of the underwater concrete 7 inside it, so that the cloth formwork 6 containing the underwater concrete 7 and the existing riprap 20 on the inner surface of the escape hole 5 are accurately meshed.

[0031] Specifically, in the process of injecting underwater concrete 7, as shown in Fig. 7, a supply hose 9 extending from a concrete pump truck (not shown) is connected to a cloth injection port 8, and the underwater concrete 7 is injected into the cloth formwork 6 through the supply hose 9 and the injection port 8. As a result, the cloth formwork 6 begins to swell, and its lower surface portion 6a is pressed against the inner bottom surface 5a of the escape hole 5 and conforms to it along the inner bottom surface 5a of the escape hole 5, while the upper surface portion 6b moves in a direction away from the lower surface portion 6a. Along with this movement, the outer portion of the side surface portion 6c (the half-folded one-sided portion that abuts against the inner peripheral surface 5b of the escape hole 5 based on the rise during laying) is pressed against the inner peripheral surface 5b of the escape hole 5, while the inner portion of the side surface portion 6c (the half-folded other-sided portion) rises without being obstructed by anything, and based on the further injection of the underwater concrete 7, the side surface portion 6c part is also pressed against the inner peripheral surface 5b of the escape hole 5 outward (see Figs. 6 and 7).

[0032] As a result, the side surface portion 6c enters the gaps 2aa between the existing riprap stones 20 that form the inner peripheral surface 5b of the escape hole 5. The arrows in the cloth formwork 6 in Fig. 7 indicate that the cloth formwork 6 swells due to the injected underwater concrete 7, and based on this, the side surface portion 6c enters the gaps 2aa between the existing riprap stones 20. At this time, by utilizing the fluidity of the underwater concrete 7 in the cloth formwork 6 and applying an external force to the underwater concrete 7 in the cloth formwork 6 with a push rod or the like through the cloth formwork 6, the underwater concrete 7 in the cloth formwork 6 can be actively and accurately guided between the existing riprap stones 20. The arrows outside the cloth formwork 6 in Fig. 7 indicate the external force applied by a push rod or the like to the cloth formwork 6 at that time. When a predetermined amount of underwater concrete 7 is injected into the cloth formwork 6, the injection is stopped, and the supply hose 9 of the concrete pump truck is withdrawn from the injection port 8. Then, the injection port 8 is closed by tying it with a string and then pushed into the cloth formwork 6, and the opening of the escape hole 5 is blocked by the cloth formwork 6 containing the underwater concrete 7 as shown in Fig. 8. After that, wait for the underwater concrete 7 in the cloth formwork 6 to harden and finish the construction.

[0033] FIG. 9 shows the second embodiment, and FIG. 10 shows the third embodiment. In each of these embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0034] In the second embodiment shown in FIG. 9, a plurality of fabric formworks 6 are prepared. For each fabric formwork 6, the laying process of the fabric formwork 6 in the escape hole 5 and the injection process of the flowing underwater concrete 7 are sequentially performed, so that a plurality of fabric formworks 6 inflated by the underwater concrete 7 are arranged in the escape hole 5. Each of these fabric formworks 6 inflated by the underwater concrete 7 is a standardized product with a determined weight and volume (the accommodation capacity of the fabric formwork 6 and the injection amount of the underwater concrete are standardized). These are arranged side by side in the horizontal direction and overlap in the vertical direction to fill the escape hole 5. Thereby, even if the escape hole 5 has expanded, elongated, or even deepened, corresponding repairs can be made. FIG. 9 shows a state in which the fabric formwork 6 inflated by the underwater concrete 7 is being incorporated in the escape hole 5. In this case, adjacent ones of the plurality of fabric formworks 6 inflated by the underwater concrete 7 are connected by inserting a connecting bar 11 into the underwater concrete 7 in both fabric formworks 6, taking advantage of the fact that the underwater concrete 7 in both fabric formworks 6 is not yet cured.

[0035] Specifically, one end side of the connecting bar 11 is inserted into the fabric formwork 6 into which the underwater concrete 7 has been injected, and the other end side is made to protrude from the fabric formwork 6. Then, the other end side of the connecting bar 11 is inserted into the fabric formwork 6 before the injection of the underwater concrete 7 that will be adjacent in the vertical or horizontal direction, and the underwater concrete 7 is injected into that fabric formwork 6. In particular, for the fabric formworks 6 that will be adjacent in the horizontal direction, when the height of the underwater concrete 7 due to the injection into the fabric formwork 6 reaches the height of the connecting bar 11, the other end side of the connecting bar 11 may be inserted into the adjacent fabric formwork 6. For the connecting bar 11, in this embodiment, epoxy resin reinforcing bars are used.

[0036] As a result, a plurality of fabric formworks 6 inflated by underwater concrete 7 can be accommodated in the through-hole 5 in an integrated state as a base material, and can accurately correspond to the states of through-holes 5 of various sizes. Of course, in this case, when the specific gravity of the underwater concrete 7 is approximately the same as that of the riprap 20, only by arranging a plurality of fabric formworks 6 containing the underwater concrete 7 so as to fill the through-hole 5, the necessary weight required for repair is satisfied. If the specific gravity of the underwater concrete 7 is made larger than that of the riprap 20, by using a plurality of fabric formworks 6 containing the underwater concrete 7, a weight greater than the necessary weight required for repair can be ensured, and the strength and stability of the repaired mooring quay 1 can be enhanced.

[0037] The third embodiment shown in FIG. 10 shows the content in which the mounting process of the stone material 10 with an anchor is executed after the injection process of the underwater concrete is completed. This is because even at the bottom of the water, it may be necessary to cover the upper surface of the fabric formwork 6 with the stone material 10a to harmonize with the surrounding environment (the environment where the riprap 20 is laid). For this reason, a plurality of stone materials 10 with anchors are prepared. Each stone material 10 with an anchor has one end of the anchor 10b attached to the stone material 10a and the other end extending away from the stone material 10a. As the stone material 10a, natural stone, artificial stone, etc. can be appropriately used, and from the viewpoint of better harmonizing with the surrounding environment, it is preferable to use natural stone. Regarding the size and weight of the natural stone, etc., since the installation work is carried out by the operator, it is preferably of a degree that the operator can hold (20 kg to 30 kg). Also, for the anchor 10b, since it is to be embedded in the underwater concrete 7, it is preferably one that can be protected from corrosion. In this embodiment, an epoxy resin steel bar in which a steel bar is coated with an epoxy resin is used. Moreover, when selecting this anchor 10b, for the wave force from the lateral direction on the stone material 10a, it is sufficiently resisted by the shear stress of the anchor 10b (the cross-sectional area of the anchor 10b), and for the uplift force on the lower surface of the stone material 10a, one that is sufficiently resisted by the adhesive force of the anchor 10b (the outer peripheral length of the anchor 10b × the extended length of the anchor 10b) is selected.

[0038] When attaching the above-mentioned stone material 10 with an anchor, while the underwater concrete 7 in the cloth formwork 6 exposed from the through-hole 5 is uncured, insert the anchor 10b of each stone material 10 with an anchor into the underwater concrete 7 through the cloth formwork 6, and fix each stone material 10a to cover the upper surface of the cloth formwork 6. As a result, it becomes possible to harmonize with the surrounding environment more than when the exposed state of the upper surface of the cloth formwork 6 is maintained.

[0039] Although the above embodiments have been described, the present invention includes the following aspects. (1) As the hardening material, in addition to the aforementioned underwater concrete 7, a material that becomes hardened through a fluid state (uncured state), such as mortar, is used. (2) As long as the flexible sheet formwork can expand with the injection of the underwater concrete 7 and can be deformed by an external force, the material of the flexible sheet formwork may be a material other than cloth. (3) During construction (especially when injecting underwater concrete 7 into the cloth formwork 6), install a pollution prevention film around the construction site to prevent the diffusion of pollution components even if they flow out during construction. (4) Regarding the repair of the through-hole of the base part 2 (constructed by the riprap 20) used in various riprap structures such as caisson-type hybrid levees, regardless of whether the base part 2 is covered with irregular blocks, root-fixed blocks, covering stones, etc., use this method. (5) The construction using this method can be carried out either above water or underwater.

Industrial Applicability

[0040] The present invention can be used to sufficiently fill the through-hole 5 formed by the riprap 20 coming out of the base part 2 with a base material, and firmly engage the base material with the existing riprap 20 forming the inner surface of the through-hole 5.

Explanation of Reference Numerals

[0041] 1 Caisson-type mooring quay (riprap structure) 2 Base part 2aa gap 5 holes 6 fabric formwork (flexible sheet formwork) 7 underwater concrete (hardening material) 11 connecting bars 20 ballast

Claims

1. A method for repairing a rubble-type structure in which rubble has fallen out of a foundation constructed with the rubble, forming a loophole in the foundation, comprising the steps of: A flexible sheet formwork capable of expanding into a three-dimensional form is laid in the loophole in a non-three-dimensional state; Next, a hardening material in a fluid state is injected into the flexible sheet mold to inflate the flexible sheet mold with the hardening material; The flexible sheet formwork inflated with the hardening material is filled into the loophole as a base material and is inserted between the existing rubble stones that form the inner surface of the loophole, A plurality of the flexible sheet forms are prepared, and for each of the flexible sheet forms, a step of laying the flexible sheet form in the loop hole and a step of injecting the hardening material in the fluid state are sequentially carried out to form a plurality of flexible sheet forms inflated with the hardening material in the loop hole; Adjacent flexible sheet formworks inflated with the hardening material are connected to each other by inserting connecting bars into the hardening material in both flexible sheet formworks, taking advantage of the fact that the hardening material in both flexible sheet formworks is still unhardened. A method for repairing a rubble-rock structure comprising the steps of:

2. In claim 1, As each of the flexible sheet forms, a cloth form is used in which a flexible sheet material is a cloth material that has air permeability and water permeability, is stretchable, and has a predetermined strength. A method for repairing a rubble-rock structure comprising the steps of:

3. In a rubble-type structure having a foundation constructed with rubble, A flexible sheet formwork is provided on a part of the base portion and is expanded by containing a hardening material, The flexible sheet formwork expanded by storing the hardening material is inserted between existing riprap around the flexible sheet formwork, and the flexible sheet formwork expanded by storing the hardening material and the existing riprap are engaged with each other, A plurality of flexible sheet forms inflated by containing the hardening material are provided in a portion of the base portion, Adjacent flexible sheet formworks expanded by storing the hardening material are connected to each other by inserting connecting bars into the hardening material in both flexible sheet formworks, taking advantage of the fact that the hardening material in both flexible sheet formworks is unhardened. A rubble-type structure characterized by:

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