Bag body fixing structure

Abstract

This more reliably prevents concrete from entering the area around the bag. [Solution] In a fixing structure for formwork bags 20 that are inserted into the hollow portion 10 of a concrete structure 1 having a hollow portion 10 and fixed inside the hollow portion 10 by filling the inside with a filler material, the fixing structure for the bags is provided in which a plurality of bags 20, 20 are inserted into the hollow portion 10 and a cover member 30 covers the upper part of the gap between adjacent bags 20, 20.

Description

Technical Field

[0001] The present invention relates to a fixing structure for a bag body used when repairing a hollow concrete structure or the like. Background Art

[0002] Among concrete slabs in bridges, viaducts, buildings and the like used for roads, railways and the like, and other various concrete structures, there are those provided with a hollow portion inside the structure. A structure provided with such a hollow portion is referred to as a hollow concrete structure.

[0003] For example, in the floor slab of a viaduct, when placing concrete, a hollow pipe body (hereinafter referred to as a hollow formwork) and necessary reinforcing bars are arranged in advance inside the concrete placement formwork, and in this state, uncured concrete is poured and cured. As the hollow formwork, for example, a steel cylindrical pipe is used. The hollow formwork is placed on a receiving member arranged in the formwork, fixed so as not to move in the lateral direction, and appropriately subjected to measures for preventing lifting (see, for example, Patent Document 1).

[0004] Further, in a hollow concrete structure, as a repair method when the concrete around the hollow portion deteriorates, there is a method using a bag body made of a flexible material. The deteriorated concrete is removed, the bag body is inserted into the hollow portion, the bag body is filled with urethane foam, and then concrete is placed in the removed portion. The intervention of the bag body filled with urethane foam as a formwork prevents concrete from entering the space corresponding to the original hollow portion (see, for example, Patent Document 2).

[0005] Also, a technique is disclosed in which the bag body is formed into a cylindrical shape to facilitate the insertion work of the bag body into the hollow portion, and the adhesion between the inner surface of the hollow portion and the outer surface of the bag body when the interior is filled with a fluid (liquid or gas) is improved (see, for example, Patent Document 3). Prior Art Documents Patent Documents

[0006] [Patent Document 1] Japanese Patent Publication No. 2002-138665 [Patent Document 2] Japanese Patent Publication No. 2005-146569 [Patent Document 3] Japanese Patent Publication No. 2023-122824 [Overview of the project] [Problems that the invention aims to solve]

[0007] When using formwork bags, depending on the shape of the hollow section, multiple bags may be inserted in parallel inside. However, using multiple bags raises concerns that concrete or other pouring material may flow into the gaps between the bags. If pouring material flows into the gaps between the bags, the shape of the hollow section changes before and after construction, which can lead to problems such as changes in the load conditions and performance of the structure. Therefore, it is desirable to prevent pouring material from flowing into the hollow section.

[0008] Therefore, the objective of this invention is to more reliably prevent the intrusion of concrete material around the bag. [Means for solving the problem]

[0009] To solve the above problems, this invention provides a fixing structure for formwork bags that are inserted into the hollow portion of a concrete structure having a hollow portion and fixed inside the hollow portion by filling the inside with a filler, wherein a plurality of the bags are inserted into the hollow portion and a cover member is provided to cover the upper part of the gap between adjacent bags (Configuration 1).

[0010] In configuration 1, a configuration can be adopted in which adjacent bags are connected to each other via the cover member (configuration 2).

[0011] In configuration 2, the bags connected via the cover member can be configured to be in contact with each other while filled with a filling material inside the bags (configuration 3).

[0012] In any one of configurations 1 to 3, adjacent bags are cylindrical, and the cover member is constructed by connecting a first member provided on one of the adjacent bags and a second member provided on the other at opposing ends, and at least one of the first member and the second member can be configured such that the length in the vertical direction perpendicular to the cylindrical axis of the bag, or the length in the width direction perpendicular to the cylindrical axis, or both, increases as it approaches the opposing end (configuration 4).

[0013] Furthermore, in any one of configurations 1 to 4, adjacent bags are cylindrical, and the distance from the cylindrical axis to the outer edge of the bag at the point where the cross-sectional area of ​​the bag in the direction perpendicular to the cylindrical axis is maximum when the bag is filled with the filling material is greater than or equal to the distance from the cylindrical axis to the outer edge of the cover member at the point where the cross-sectional area of ​​the cover member in the direction perpendicular to the cylindrical axis is maximum (configuration 5).

[0014] Furthermore, in any one of configurations 1 to 5, adjacent bags are cylindrical, and the cover member is attached to the bag inward in the cylindrical direction from the end of the bag in the cylindrical direction (configuration 6).

[0015] A bag used in the fixing structure of a bag described in any one of configurations 1 to 6, which is made of a flexible material and can be used to insert into the hollow part of a concrete structure having a hollow part (configuration 7).

[0016] Furthermore, a concrete structure repair method can be adopted in which a fixing structure for the bag body described in any one of configurations 1 to 6 is used, and unhardened concrete material is poured around the bag body and hardened (configuration 7). [Effects of the Invention]

[0017] According to the present invention, intrusion of placing material into the periphery of the bag body can be prevented more reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] [Figure 1] Cross-sectional view showing an example of a concrete structure [Figure 2] Perspective view showing an embodiment of the present invention and illustrating a situation when a bag body is inserted into a hollow portion [Figure 3] Longitudinal sectional view showing the embodiment and illustrating a state where a plurality of bag bodies are inserted in a connected state into a hollow portion [Figure 4] Perspective view showing a situation when a filler is filled into a bag body inserted into a hollow portion [Figure 5] Front view showing a state of bag bodies before connection [Figure 6] Plan view of a bag body [Figure 7] Longitudinal sectional view showing a state where a new concrete layer is placed [Figure 8] Enlarged view of essential parts showing a modified example of a cover member MODE FOR CARRYING OUT THE INVENTION

[0019] An embodiment of the present invention will be described based on the drawings. Here, the configuration of the present invention will be described by taking a viaduct floor slab used for a road as an example of a hollow concrete structure 1 (hereinafter referred to as structure 1) in which a hollow portion 10 is provided in concrete.

[0020] In this embodiment, as shown in Figure 1, a hollow formwork 11 (hereinafter referred to as formwork 11) is embedded inside the concrete deck slab that constitutes the roadbed 2. The necessary reinforcing bars 4 are arranged around the formwork 11. The type, location, and number of reinforcing bars 4 are set appropriately according to the specifications of the structure 1. In this embodiment, a steel cylindrical pipe is used as the formwork 11, and multiple formwork 11s are arranged parallel to each other along the bridge axis direction of the elevated bridge. The formwork 11 is held in place by various fixing devices (not shown / see, for example, Figures 1 and 2 of Patent Document 1) so that a predetermined cover thickness is ensured for the reinforcing bars 4 and for the upper and lower surfaces of the deck slab, and so that lateral movement is restricted, and is embedded in the concrete in that state. The space inside this formwork 11 constitutes the hollow section 10.

[0021] When the structural frame of Structure 1 (paving material, concrete, etc.) deteriorates over time, resulting in corrosion or damage, repair work is carried out on the affected areas. In addition, work is also carried out to reinforce Structure 1, either in conjunction with the repairs or to increase its strength. These works are collectively referred to as the repair work on Structure 1. The areas of corrosion and damage can be identified by visual inspection of surface abnormalities or by known non-destructive testing methods.

[0022] The repair work is carried out by inserting a bag 20 into the hollow section 10 facing the area to be repaired, filling the bag 20 with a filler material, and then pouring new concrete into the area to be repaired. At this time, the bag 20 filled with the filler material acts as a formwork, so that the shape of the space corresponding to the original hollow section 10 is maintained in the structure 1.

[0023] The repair work in this embodiment begins with the step of removing the deteriorated parts of the structure to expose the hollow section 10.

[0024] In Figure 1, reference numeral 3 indicates an opening 3 created by removing the pavement that constitutes the surface layer 2a of the roadbed 2, which is the deteriorated portion, and the concrete layer 2b below the surface layer 2a. In the opening 3, the reinforcing bars 4 located above the hollow section 10 are exposed. The reinforcing bars 4 are arranged in a grid pattern where the reinforcement in the direction of the bridge axis and the reinforcement in the direction perpendicular to the bridge axis intersect at right angles in a plan view. Below the reinforcing bars 4, the structure has been removed until the upper surface of the formwork 11 is exposed. The opening 3 in the roadbed 2 is connected to an opening 13 in the formwork 11. The opening 13 in the formwork 11 may be a hole caused by corrosion of the members constituting the formwork 11, or it may be a hole created when the structure of the roadbed 2 was removed.

[0025] Next, as shown in Figure 2, the bag 20 is inserted into the hollow section 10 through the openings 3 and 13. The bag 20 in this embodiment has a circular cross-section and a longitudinal shape. Because the hollow section 10 has a circular cross-section and a longitudinal shape, the bag 20 is easy to insert along the longitudinal direction of the hollow section 10. In addition, since the bag 20 is made of a flexible material, it can be flexibly deformed. For this reason, it is easy to insert it into the hollow section 10 through the gaps in the grid-like reinforcing bars 4 (see Figure 2).

[0026] The material of the bag 20 can be any material that has a predetermined strength to withstand internal and external pressure and is resistant to damage (less prone to punctures). For example, synthetic resins such as polyvinyl chloride, polyester, and polyurethane, or rubber can be used, and these may also be materials reinforced with textile fabrics. The material of the bag 20 may be non-stretchable or may be a material with a certain degree of stretchability (shape conformability).

[0027] The bag body 20 is formed by winding a strip of material into a cylindrical shape and then sealing the ends by narrowing both ends in the axial direction of the cylinder. The length of the bag body 20 (length in the longitudinal direction) can be set as appropriate, but it is desirable to make it large enough so that the filling material to be filled inside reaches every corner. The diameter of the bag body 20 can be set as appropriate to match the size of the hollow section 10, but it is desirable to set it so that the outer surface 20a of the bag body 20 contacts the inner surface 10a of the hollow section 10 when the internal pressure is at a predetermined pressure, so that the bag body 20 is easily fixed inside the hollow section 10. The shape of the bag body 20 can also be set as appropriate to match the shape of the hollow section 10, but if the hollow section 10 is cylindrical, it is desirable that the bag body 20 also be cylindrical as in this embodiment. However, its cross-sectional shape is not limited to a perfect circle and can be set as appropriate according to the specifications and purpose of construction.

[0028] Multiple bags 20, 20 are inserted into the hollow section 10 in parallel along its longitudinal direction. Figure 3 shows four bags 20 arranged in parallel along the longitudinal direction, but the number of bags 20 used can be appropriately set according to the construction area. Also, in Figure 3, the bags 20 are shown slightly inflated for easier understanding. When inserting the bags 20 into the hollow section 10, a small amount of filler material may be filled to slightly inflate the bags 20. However, it is desirable that the outer surface 20a of the bags 20 does not come into close contact with the entire inner surface 10a of the hollow section 10 until the filler material is filled to a predetermined pressure inside the bags 20.

[0029] Here, a cover member 30 is provided between adjacent bag bodies 20, 20 to cover the upper part of the gap between the bag bodies 20, 20. The adjacent bag bodies 20, 20 are connected via the cover member 30 (see Figure 3). In addition, as shown in Figures 5 and 6, the bag body 20 is provided with a handle 22, so that when moving the bag body 20 within the hollow section 10, the handle 22 can be grasped.

[0030] Next, as shown in Figure 4, the bag 20 is filled with fluid as a filler. The bag 20 expands due to the pressure of the filler being filled inside, and is firmly fixed in close contact with the inner surface of the hollow section 10 (see the bag 20 shown in Figure 7).

[0031] In this embodiment, air is used as the fluid (filling material). The fluid can be supplied from an external fluid source by a pump or the like through a supply pipe 25 connected to a supply pipe connection part 21 provided on the bag body 20. In this embodiment, two supply pipe connection parts 21 are provided on one bag body 20 so that the fluid can flow back and forth between adjacent bag bodies 20 by connecting the supply pipes 25, thereby enabling pressure control including the other connected bag bodies 20. That is, one supply pipe connection part 21 can be used for injection from the pump, and the other supply pipe connection part 21 can be used as a bypass to the other bag body 20. Alternatively, the two supply pipe connection parts 21 may be designated as an inlet 21a and an outlet 21b, with the supply pipe 25a on the sending side connected to the inlet 21a and the supply pipe 25b on the returning side connected to the outlet 21b, so that the fluid can be smoothly filled into the bag body 20. Each supply pipe connection 21 is equipped with a sealing function (valve), so that after the supply pipe 25 is removed, the fluid inside the bag 20 can be sealed to prevent leakage to the outside. Reference numeral 23 in the figure indicates a retainer to prevent the valve or the like provided on the supply pipe connection 21 from falling into the bag 20.

[0032] In addition to air and water, a fluid mortar may be used as the filler material to be placed in the bag 20. In cases including when mortar is used, the filler material may be removed after the completion of construction.

[0033] Finally, unhardened concrete is poured into the upper part of the opening 13, that is, the area where the main structure was removed, to create a new concrete layer C (see Figure 7). In this embodiment, the concrete layer C consists of a concrete layer 5b that constitutes the slab and a surface layer 5a, which is pavement for road surface finishing, on top of it, and after hardening it constitutes the newly constructed structure 5. Concrete is generally used as the concrete material, but asphalt, mortar, or other materials may be used depending on the location.

[0034] Here, when pouring in uncured concrete, the cover member 30 that covers the upper part of the gap between the bags 20, 20 prevents the concrete from getting between them. Also, since adjacent bags 20, 20 are connected via the cover member 30, the gap between the bags 20, 20 is not widened by the concrete. By using multiple bags 20 connected in this way, a formwork can be created that can be used for renovations over a wide area.

[0035] Furthermore, since the end face 24b of the bag body 20 in the axial direction tends to bulge spherically, when the bag bodies 20, 20 connected via the cover member 30 come into contact with each other, they push against each other, generating tension in the cover member 30. As a result, the cover member 30 is able to withstand the pressure of the pouring material (the pressure of pouring concrete). Therefore, the cover member 30 can easily maintain its shape against the pressure of the pouring material and can perform highly functionally as formwork.

[0036] As shown in Figures 5 and 6, the cover member 30 of the embodiment is constructed by connecting a first member a provided on one of two adjacent bag bodies 20, 20 with a second member b provided on the other, at an opposing portion 32. The first member a and the second member b are each made of flexible sheet members 31, 31. The opposing portions 32 of the first member a and the second member b are brought closer together in the direction of the arrows shown in Figure 5 and then connected to each other with wire fasteners. As the flexible sheet members 31, 31, for example, the same material as the bag body 20, or other nonwoven fabrics, woven fabrics, etc. can be used.

[0037] The wire fasteners are attached by sewing (sewn together) along the edges of the opposing portions 32 of the first member a and the second member b. The first member a and the second member b are also attached to the cylindrical body portion 24a of the bag body 20 by sewing along the cylindrical axis (see reference numeral 33 in Figures 5 to 7).

[0038] Furthermore, the connecting means for the opposing parts 32 is not limited to wire fasteners; point fasteners (such as snap buttons), hook fasteners, or other well-known connecting means may be used. For example, a hole may be made in one of the first member a and the second member b, a string may be attached to the other, the string of the other member may be passed through the hole in the first member, and the two members may be connected by tying the string together while pulling it in a direction that brings the first member a and the second member b closer together.

[0039] Furthermore, in this embodiment, the connecting means of the opposing portion 32 is configured to close the upper parts of adjacent bag bodies 20, 20 and leave the lower parts open. That is, the first member a and the second member b cover the upper and side parts of adjacent bag bodies 20, 20 but not the lower parts. However, the first member a and the second member b may be configured to cover the entire circumference of the cylindrical axis of adjacent bag bodies 20, 20. In this case, the connecting means of the opposing portion 32 may connect the entire circumference of the cylindrical axis of the first member a and the second member b.

[0040] Incidentally, when the bag body 20 expands, it tends to spread out into a spherical shape, and the area near the end face 24b in particular tends to protrude convexly in the direction of the cylindrical axis, which may prevent it from making close contact with the inner surface 10a of the cylindrical hollow portion 10. However, in this embodiment, the first member a and the second member b (cover member 30) are attached to the bag body 20 at an inner side in the direction of the cylindrical axis than the end face 24b of the bag body 20 (see the suture portion indicated by reference numeral 33 in Figures 5 to 7). Therefore, when the inside of the bag body 20 reaches a predetermined pressure or higher and installation is complete, the effect of this protrusion of the bag body in the direction of the cylindrical axis becomes less significant, and the radial size difference between the maximum diameter portion of the bag body 20 and the cover member 30 is reduced. As a result, the gap between the outer surface 20a of the bag body 20 and the inner surface 10a of the hollow portion 10 can be reduced.

[0041] In this embodiment, the first member a and the second member b are composed of flexible sheet members 31, 31, respectively, but they may be composed of materials other than flexible sheet members 31. For example, a rigid board (plastic corrugated cardboard, wood, etc.) may be used as the cover member 30. However, it is desirable that the material does not allow the concrete to penetrate it.

[0042] Furthermore, according to this invention, gaps are unlikely to occur between the outer surface 20a of the bag body 20 and the inner surface 10a of the hollow portion 10. However, if a gap does occur, it is preferable to fill it with an elastic material such as urethane sponge, soft resin, or rubber as appropriate.

[0043] In this embodiment, the lengths of the first member a and the second member b constituting the cover member 30 in the direction of the cylindrical axis are the same, but these lengths may be made different to create an asymmetrical design. Alternatively, one of the first member a and the second member b may be omitted, and the first member a provided on one bag body 20 may be directly connected to the body portion 24a of the other bag body 20. Or, the second member b provided on the other bag body 20 may be directly connected to the body portion 24a of the one bag body 20. Furthermore, the bag bodies 20, 20 may be connected to each other by connecting a sheet member (strip member) with fasteners on both sides to fasteners provided on the body portions 24a of the bag bodies 20, 20.

[0044] The timing for connecting the bag bodies 20, 20 with the cover member 30 is preferably before inserting the bag bodies 20 into the hollow section 10. However, for example, one bag body 20 may be connected to the other bag body 20 after it has been placed in the hollow section 10, or while it is being placed (while the end of the bag body 20 is still exposed to the outside of the hollow section 10).

[0045] Figure 8 shows a modified example of the cover member 30. In the cover member 30 of Figure 8, the outer diameters of the first member a and the second member b increase as they approach the opposing portion 32. That is, the length in the vertical direction perpendicular to the cylindrical axis and the length in the width direction perpendicular to the cylindrical axis of the bag body 20 increase as they approach the opposing portion 32, resulting in an overall tapered shape. Therefore, the size difference between the diameter L1 of the maximum diameter portion of the bag body 20 when the filler material is filled to a predetermined pressure or higher (when installation is complete) and the diameter L2 of the cover member 30 at the connection portion to the bag body 20 can be further reduced. Therefore, the gap with the inner surface 10a of the hollow portion 10 can be further reduced. The effect of making the cover member 30 tapered can be achieved even if only one of the first member a or the second member b is used.

[0046] In Figure 8, the symbol a indicates the outer edge of the bag 20 before expansion, and the symbol b indicates the outer edge of the bag 20 when the filler material is filled to a predetermined pressure or higher (when installation is complete). Similarly, the symbol a' indicates the outer edge of the cover member 30 before expansion, and the symbol b' indicates the outer edge of the cover member 30 when the filler material is filled to a predetermined pressure or higher (when installation is complete). The diameters L1 and L2 in the figure indicate the vertical dimensions of each member, but the same relationship applies to the width dimensions. Note that in Figure 8, the opposing portion 32 of the cover member 30 is shown separated for easier understanding.

[0047] As described above, when the filler is filled to a predetermined pressure or higher, it is desirable that the distance from the cylindrical axis of the outer edge of the bag 20 at the point where the cross-sectional area in the direction perpendicular to the cylindrical axis of the bag 20 is maximum (corresponding to diameter L1 ÷ 2 in the embodiment) is the same as or greater than the distance from the cylindrical axis of the outer edge of the cover member 30 at the point where the cross-sectional area in the direction perpendicular to the cylindrical axis of the cover member 30 is maximum (corresponding to diameter L2 ÷ 2 in the embodiment).

[0048] Furthermore, spacers may be installed at the openings 3 and 13 of the hollow section 10 to prevent a portion of the bag body 20 from protruding outside the hollow section 10 through the openings 3 and 13. As spacers, for example, plate-shaped members made of concrete, wood, resin, metal, etc., shaft-shaped members or block-shaped members made of similar materials can be used.

[0049] Furthermore, a release agent layer may be provided on the outer surface 20a of the bag 20 to facilitate separation of the outer surface 20a of the bag 20 from the inner surface 10a of the hollow portion 10. Examples of materials for the release agent layer include silicone resin and fluororesin.

[0050] Here, the pressure of the filler material inside the bag 20 (predetermined pressure) is set to be higher than or equal to the pouring pressure when pouring a new pouring material layer C. Here, the pouring pressure of the new pouring material layer C can be defined as the pressure acting at the bottom of the flowing, unhardened concrete (pouring material) in the case of concrete. In this case, it corresponds to the pressure from the unhardened concrete near the top surface of the bag 20. For example, if the pouring pressure of the concrete is 3 kPa, the pressure inside the bag 20 can be set to 6 kPa (safety factor 2), taking a safety factor into consideration. Of course, it is assumed that the strength of the bag 20 is sufficient to withstand that pressure. However, this condition does not necessarily have to be achieved before pouring the pouring material. For example, even if the normal force is slightly lower than the pouring pressure before pouring, the internal pressure of the bag 20 increases when it receives the pouring pressure, and then the normal force on the bag 20 side balances the pouring pressure, so that the bag 20 does not sink any further even when subjected to pouring pressure and functions as formwork.

[0051] In the above embodiment, a cylindrical steel pipe is used as the formwork 11, but the formwork 11 can take various forms. For example, in addition to a cylindrical pipe with a perfectly circular cross-section, a structure 1 can be made using a cylindrical body with various cross-sections or a hollow member of other shapes. Furthermore, a structure 1 may also have a hollow section 10 in which the formwork 11 does not exist (the formwork 11 has been removed). The bag body 20 of this invention can also be applied to a structure 1 having a formwork 11 or a hollow section 10 in any of these forms. The cross-sectional shape of the bag body 20 can also be set to an appropriate shape.

[0052] Furthermore, in the above embodiment, the configuration of this invention was explained using as an example a configuration in which the bag body 20 is longitudinal with a circular cross-section and is inserted along the longitudinal direction of the longitudinal hollow portion 10. However, the shape of the bag body 20 can be changed in various ways to match the shape of the hollow portion 10 in which it is placed. For example, assuming a hollow portion 10 that is rectangular in plan view and has a certain length in the vertical and horizontal directions, multiple longitudinal bag bodies 20 with arbitrary cross-sections may be prepared, and these multiple bag bodies 20 may be arranged in parallel so that their longitudinal directions are parallel, and a cover member 30 extending in the longitudinal direction may be placed to cover the gap between adjacent bag bodies 20, 20. The cover member 30 can be set to cover the gap between adjacent bag bodies 20, 20 over the entire length in the longitudinal direction. Moreover, this invention can be applied to various types of bag bodies 20 other than longitudinal shapes.

[0053] In the above embodiment, the configuration of this invention was explained using the case where a new cast material layer C is constructed above the hollow portion 10 as an example. However, this invention can also be applied when a new cast material layer C is constructed below or to the side of the hollow portion 10, or within the hollow portion 10 in a portion facing the bag 20.

[0054] In the above embodiment, the structure of this invention was explained using the deck slab of an elevated bridge used for roads as an example of structure 1. However, this invention can be applied to other forms of concrete structures, such as elevated bridges other than roads, various bridges used for roads and railways, concrete slabs in buildings, and various other concrete structures. Furthermore, this invention can be applied not only to planned large-scale renovations of structure 1, but also to emergency repairs for partial deformations (such as partial subsidence of the road surface) that occur in structure 1, and to repairs that improve the strength of structure 1. [Explanation of Symbols]

[0055] 1. Concrete structure (structure) 2 skeleton 3,13 Opening 10 Hollow part 10a Inner surface 11 Formwork 20 Bag body 30 Cover component 32 Opposing part a First member b Second member

Claims

1. In a fixing structure for a formwork bag (20) which is inserted into the hollow portion (10) of a concrete structure (1) having a hollow portion (10) and fixed inside the hollow portion (10) by filling the inside with a filler material, A bag fixing structure comprising a plurality of bag bodies (20, 20) inserted into the hollow portion (10), and a cover member (30) covering the upper part of the gap between adjacent bag bodies (20, 20).

2. The bag fixing structure according to claim 1, wherein adjacent bag bodies (20, 20) are connected to each other via the cover member (30).

3. The bag fixing structure according to claim 2, wherein the bag bodies (20, 20) connected via the cover member (30) are in contact with each other with the bag bodies (20, 20) filled with a filling material.

4. The bag fixing structure according to claim 1, wherein adjacent bag bodies (20, 20) are cylindrical, and the cover member (30) is constructed by connecting a first member (a) provided on one of the adjacent bag bodies (20, 20) and a second member (b) provided on the other at an opposing portion (32), and at least one of the first member (a) and the second member (b) increases in length in the vertical direction perpendicular to the cylindrical axis direction of the bag body (20) or in the width direction perpendicular to the cylindrical axis direction, or both, as it approaches the opposing portion (32).

5. The bag fixing structure according to claim 1, wherein adjacent bag bodies (20, 20) are cylindrical, and the distance from the cylindrical axis to the outer edge of the bag body (20) at the point where the cross-sectional area of ​​the bag body (20) in a direction perpendicular to the cylindrical axis direction is maximum when the bag body (20) is filled with the filling material is greater than or equal to the distance from the cylindrical axis to the outer edge of the cover member (30) at the point where the cross-sectional area of ​​the cover member (30) in a direction perpendicular to the cylindrical axis direction is maximum.

6. The bag fixing structure according to claim 1, wherein adjacent bag bodies (20, 20) are cylindrical, and the cover member (30) is attached to the bag body (20) inward in the cylindrical direction from the cylindrical direction end of the bag body (20).

7. A bag (20) used in a bag fixing structure according to any one of claims 1 to 6, the bag being made of a flexible material and inserted into the hollow portion (10) of a concrete structure (1) having a hollow portion (10).

8. A method for repairing a concrete structure, comprising using a bag-type fixing structure described in any one of claims 1 to 6, and filling the bag-type (20) with unhardened concrete material to allow it to harden.

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