Grout injection tool and masonry repair method

Abstract

To provide a grout injection tool and a masonry repair method capable of filling a filler behind a joint without scraping the joint even when a joint opening is narrow.SOLUTION: A grout injection tool 1 comprises a cylindrical leading-in part 2 made of a flexible member and having a flattened tip end, a cylindrical connecting pipe part 3 connected to a base end side of the leading-in part 2, and an outlet 4 formed to open at a tip of the leading-in part 2. The tip of the leading-in part 2 of the grout injection tool 1 is inserted into a joint in a masonry retaining wall, a tip of a grout injection hose connected to a grout pressure-feeding pump is inserted into the connecting pipe part 3, and grout is pressure-fed into the grout injection tool 1, and the grout is poured into the joint from the outlet 4, filling the space in the joint with grout. After filling, the grout injection tool 1 is removed from the joint.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a grout injection tool used to repair a masonry retaining wall that has opened or loosened joints, and a masonry repair method using the same. [Background technology]

[0002] When repairing a masonry retaining wall with gaps or loose joints, the wall is reinforced by injecting a grout material such as non-shrink mortar, water glass, or synthetic resin (epoxy resin, urethane resin, polyester resin, etc.) into the joints and allowing it to harden. The techniques described in Patent Documents 1 to 7 are known as methods for repairing such masonry retaining walls.

[0003] The method of reinforcing a retaining wall described in Patent Document 1 involves forming a narrow through hole (7) penetrating the masonry (1), inserting a perforated pipe (8) into the through hole (7), and injecting mortar (12) through the perforated pipe (8) to sufficiently fill the cavity (5) on the back side of the masonry (1) with mortar (12) (see Figure 1 in Patent Document 1). The perforated pipe (8) has an inner diameter of 35 to 45 mm, an outer diameter of 40 to 55 mm, and a length of 400 to 600 mm (see Claim 5 in Patent Document 1). A sealing filler is injected into the gap between the through hole and the perforated pipe and into the gap in the retaining wall, and the gap is sealed by injecting the sealing filler into each gap. An injection nozzle is connected to the perforated pipe, and the filler is injected from the injection nozzle through the perforated pipe into the cavity at a discharge pressure of 0.1 to 0.5 MPa. After the filler is injected, the perforated pipe is removed from the through hole, and the through hole after the perforated pipe is removed is sealed with new filler. (See Reference

[0008] )

[0004] The masonry reinforcement method described in Patent Document 2 involves drilling a hole at the joint of the joint, directly inserting an injection hose connected to the discharge port of a grout injection pump, and injecting a filler from the injection hose (see Figure 6 of the document).

[0005] In the reinforcement method for masonry retaining walls described in Patent Document 3, a drainage member is inserted into the joints (6) of the masonry stones (2), a nozzle (8) is inserted through the joints (6), and a foaming agent is sprayed through the nozzle (8) into the back wall of the cavity (5) to form a barrier wall (9) that covers the entire back wall surface (see Figure 1 of the Patent Document). At this time, if the adjacent masonry stones (2) are in close contact with each other and there is no gap in the joints 6 required for the work, the joints (6) are chipped away with a chipping tool such as a pick to an extent that a sufficient gap can be secured (see Patent Document

[0025] ). After the foaming agent in the barrier wall (9) has solidified, a filler (grout) (10) is injected into the cavity (5) through the joints (6) of the masonry stones (2) to fill the cavity (5). The filler (10) is injected by pouring it in using a mortar injector or funnel, or by spraying it using a mortar sprayer (11) (see Document

[0037] , Figure 4).

[0006] In the method for reinforcing a masonry retaining wall described in Patent Document 4, first, the joints (1a) of the masonry retaining wall, which includes assembled masonry stones (1) and the inner surface (the back side of the masonry stones (1)) behind them, are sealed with a sealant, and an injection port (12) is provided for injecting grout material from the surface side of the masonry stones (1) into the gaps between the inner surfaces. For example, a nozzle at the tip of a grout material injection hose with a large / small diameter of 50 mm / 30 mm and a length of about 100 mm or a shaped tube (13a) such as a PVC pipe equivalent thereto is inserted into the joint (1a), and the sealant is applied around it, hardened, and then removed to form the sealant. The sealant is made by mixing inorganic early-hardening cement with silica-based silica sand No. 6 to 7 and an organic adhesive in an appropriate ratio, adding water to the mixture, and kneading it. The installation location is above one row of joints where the intervals are wide, or where the ends of the stones near the joints have been slightly shaved, and the number of the sealants is 1 m. 2 Two or three holes are placed per hole (Patent Reference

[0018] ). Next, the grout material is injected from the injection port (12) using a pump. After the grout material has solidified, a core (16) is removed from the surface side using a drilling machine where the grout material was injected. A water filter (17) is installed in the space left by the core.

[0007] In the method for repairing masonry described in Patent Document 5, first, the joints (13) of each gap stone (2) are washed with high-pressure water sprayed from a high-pressure washing device to remove foreign matter such as moss and dirt, and then a base agent (22) made of epoxy resin is applied to the washed joints (13) and allowed to harden. Next, a bonding agent (23) made of clay-like epoxy resin is filled into the joints (13) with the base formed therein using a gun-type injection machine or by hand filling, and the joints (13) are sealed. Next, a hole is opened using a hole saw from the face (14) of the gap stone (2) to the backing material layer (20) of the back part (6) and a polyvinyl chloride drain pipe (26) is installed. This series of operations for sealing and gluing the joints (13) is performed up to, for example, the second row of the gap stones (2) piled in a valley. Next, a filler (27) (mortar) is poured using a funnel (28) into the joints (13) above the second row of the valley-piled gap stones (2) where the joints (13) are not sealed or glued. The poured mortar (27) flows under its own weight and fills the cavities (21) of the masonry (1) where the joints (13) have been repaired. After the mortar (27) filled in the cavities (21) has hardened, the work of sealing and gluing the joints (13) and filling the cavities (21) with mortar (27) are repeated above the second row of the valley-piled gap stones (2) until the entire surface of the masonry (1) is repaired. (See Fig. 4 in previous documents

[0014] to

[0016] )

[0008] In the method for seismic reinforcement of a masonry wall described in Patent Document 6, a core cutter (11) is used to remove masonry materials (2B) near a masonry junction (P1) where four masonry materials almost meet on the surface of the masonry wall, and an insertion opening (12) is formed to reach the core stone area from the outside. A driving injection pipe (13) with a pointed end (13b) at its front end and an inlet (13c) at its rear end is inserted through the insertion opening (12) and pushed in by impact. The driving injection pipe (13) is then pulled out and hardened to form a roughly bulb-shaped solidified area between the back of the four masonry materials and the ground (G). This process is repeated to form multiple solidified areas so that the planar arrangement when viewed from the surface of the masonry wall is roughly scattered (see Figures 1, 3, and 4 of the document).

[0009] In the method of reinforcing masonry described in Patent Document 7, first, a flexible, elastic bag (1) is placed over the tip of a pipe (2) and inserted through the gap (joint) (7) in the masonry (A) until it reaches the back of the cavity (Patent Document

[0017] , Figure 1). A flexible bag made of rubber or synthetic resin material, etc., with a thickness of 0.02 to 1.20 mm, a width of 30 to 60 cm, a length of 60 to 120 cm, and a capacity of about 0.002 to 0.010 m3 is used for the bag (1), and an easily cut synthetic resin pipe such as a polyvinyl chloride plumbing pipe is used for the pipe (Patent Documents

[0014] to

[0015] ). Next, a hose for supplying the filler is connected to the pipe (2) using a connecting device, the filler (13) is filled into the bag (1) through the pipe (2), the filler (13) fills the cavity via the bag (1), the filler (13) is hardened, the hardened filler (13) is cut out together with the pipe (2) to match the surface of the stonework, and a waterproof paint of the same color as the piled stones (11) is applied to the cut surface (Patent Documents

[0018] to

[0021] ). [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2017-040162 A [Patent Document 2] Patent Publication No. 2022-101245 [Patent Document 3] JP 2015-040463 A [Patent Document 4] JP 2000-355949 A [Patent Document 5] JP 2005-036636 A [Patent Document 6] JP 2006-283309 A [Patent Document 7] Japanese Patent Application Publication No. 09-256393 Summary of the Invention [Problem to be solved by the invention]

[0011] In the conventional masonry retaining wall repair method described above, the following methods are used to inject grout into the joints: (a) directly insert an injection hose connected to a grout injection pump, (b) insert a rigid injection pipe such as a polyvinyl chloride pipe or a driving injection pipe and connect the injection hose to the rigid injection pipe and inject (the rigid injection pipe is left in the joint after injection), or (c) use a funnel to pour grout into the joints. In this case, if the joint does not open sufficiently, part of the joint is cut away with a drill or chipping tool to create a gap for injection before inserting the injection hose, rigid injection pipe, or funnel.

[0012] However, although the masonry as a whole has gaps and loose joints, there are often cases where the gaps are narrow locally. In addition, there are also cases where the area of ​​the masonry wall to be repaired is large, or where the height of the masonry wall is taller than the height of the worker. In such cases, it takes a lot of time to find places where the gaps are not large enough and to cut the gaps with a drill or chipping tool, which is a factor in reducing the efficiency of the repair work. In addition, since the cutting work applies vibrations and impacts to the masonry, in masonry where deformation due to earth pressure has progressed and the masonry has become loose overall or in parts, stones may fall out during the cutting work, which is a safety issue.

[0013] Therefore, an object of the present invention is to provide a grout injection tool and a masonry repair method that can fill the back of a joint with a filler without having to cut the joint with a drill or the like, even if the joint opening is narrow. [Means for solving the problem]

[0014] The first configuration of the grout injection tool according to the present invention is a cylindrical leading-in part made of a flexible member and having a flat tip side, A cylindrical connecting pipe portion connected to a base end side of the leading-in portion; and a pouring outlet formed at the tip of the leading portion.

[0015] According to this configuration, when injecting grout into the joints of a masonry retaining wall, first the leading-in part of the grout injection tool is inserted into the joint, and then the grout is injected from the cylindrical connecting pipe part of the grout injection tool, thereby enabling the grout to be injected into the joint. The leading-in part has a flattened tip and is flexible, so that it can be inserted even into narrow joints, and the grout injection tool can be inserted into the joint and filler can be filled behind the joint without having to cut the joint with a drill or the like.

[0016] Here, the "flexible member" may be made of synthetic resin, rubber, etc. "Grout" is a general term for materials injected into gaps. Non-shrink mortar, water glass, synthetic resin (epoxy resin, urethane resin, polyester resin, etc.), etc. are usually used as grout for repairing masonry retaining walls.

[0017] A second configuration of the grout injection tool according to the present invention is the first configuration, wherein the leading portion has a flat shape at the tip side and a shape in which the center of the tip side protrudes in an arc shape, The pouring outlet is formed as an opening at the tip of the leading portion.

[0018] According to this configuration, by making the shape of the tip edge of the leading-in portion such that the center of the tip edge protrudes in an arc shape, it becomes easier to insert the tip of the leading-in portion into the joint, improving work efficiency.

[0019] A fourth configuration of the grout injection tool according to the present invention is the first configuration, wherein the leading portion has a flat tip side and a tip side inclined with respect to a central axis, The pouring outlet is formed as an opening at the tip of the leading portion.

[0020] According to this configuration, by configuring the shape of the tip edge of the leading-in portion so that the tip edge is inclined with respect to the central axis, it becomes easier to insert the tip of the leading-in portion into the joint, improving work efficiency.

[0021] A third configuration of the grout injection tool according to the present invention is the first configuration, wherein the leading portion is formed into a cylindrical shape with a flat tip side and a sealed central tip side portion, The pouring outlet is formed as an opening at one or both of the left and right corners of the tip edge of the leading portion.

[0022] According to this configuration, by forming an outlet at one or both of the left and right corners of the tip edge of the forward-fitting portion, the grout injected into the joint can be caused to flow toward the left or right side or both sides within the joint.

[0023] A fifth configuration of the grout injection tool according to the present invention is the first configuration, wherein the leading portion has a flat tip side and a sealed tip edge, The pouring outlet is formed as an opening on one or both of the left and right side surfaces at the tip side of the leading portion.

[0024] According to this configuration, by forming an outlet on one or both of the left and right side surfaces at the tip of the forward-fitting portion, the grout injected into the joint can be caused to flow toward the left or right side or both within the joint.

[0025] A first configuration of the masonry repair method according to the present invention is a masonry repair method for repairing a masonry wall by injecting and hardening grout into a cavity formed inside the masonry wall constructed by piling up masonry, An injection tool setting process in which a tip portion of a grout injection tool having any one of the first to fifth configurations is inserted into a joint between each stone of a masonry retaining wall; A hose connection process of inserting the tip of a grout injection hose connected to the discharge port of a grout pump into the connection pipe of the grout injection tool inserted into the joint, or connecting the tip of the grout injection hose; A grout filling process in which grout is pumped to a grout injection tool through a grout injection hose to inject grout into the joint from an injection outlet of the grout injection tool to fill the space in the joint with grout; and an injection tool removal step of removing the grout injection tool from the joint after filling the space in the joint with grout.

[0026] According to this method, first, the joints into which the grout is to be injected are determined, the tip of the grout injection tool is inserted into those joints, and then the grout is injected into the joints from the connecting pipe of the inserted grout injection tool via the grout injection hose by the grout pressure pump, thereby making it possible to efficiently inject the grout into the joints. In addition, since the grout injection tool that has been used is removed from the joints and collected in the injection tool removal process, the grout injection tool can be reused, and the same grout injection tool can be used repeatedly to inject the grout into each section of the masonry retaining wall.

[0027] The second configuration of the stone masonry repair method according to the present invention is that in the hose connecting step, The method is characterized in that the tip of the grout injection hose is inserted into the connecting pipe portion of the grout injection tool, and the tip of the grout injection hose is used to push open the leading-in portion of the grout injection tool from the inside, thereby bringing the inner wall of the entrance portion of the joint and the outer wall of the leading-in portion into tight contact with each other.

[0028] According to this method, the tip of the grout injection hose is used to push open the leading-in part of the grout injection tool from the inside, thereby bringing the inner wall of the entrance part of the joint and the outer wall of the leading-in part into tight contact with each other. This prevents the grout injected into the joint by the grout pressure pump from being pushed out and leaking out of the joint before the space behind the joint is sufficiently filled with grout, making it possible to inject grout into the joint more reliably and efficiently.

[0029] A third configuration of the stone masonry repair method according to the present invention is a grout injection tool having any one of the first to third configurations, In the hose connecting step, The method is characterized in that the tip of the grout injection hose is inserted into the connecting pipe portion of the grout injection tool, and the tip of the grout injection hose is inserted into the inside of the joint using the inner wall of the leading-in portion of the grout injection tool as a guide until the tip of the grout injection hose protrudes from the outlet at the tip of the leading-in portion of the grout injection tool.

[0030] According to this configuration, when the opening of the joint into which grout is injected is large, the tip of the grout injection hose is inserted into the inside of the joint using the inner wall of the leading-in part of the grout injection tool as a guide until the tip of the grout injection hose protrudes from the outlet of the leading-in part of the grout injection tool, so that grout can be directly injected from the grout injection hose into the space behind the joint, and grout can be injected more reliably and efficiently into the joint. Also, the flexible leading-in part is pushed open from the inside by the grout injection hose so that the inner wall of the entrance part of the joint and the outer wall of the leading-in part are in close contact with each other or the gap is narrowed, so that the grout injected into the joint by the grout pressure-feeding pump is prevented from being pushed out of the joint and leaking out before the space behind the joint is sufficiently filled with grout. Effect of the Invention

[0031] As described above, according to the grout injection tool of the present invention, it is possible to insert the pre-filled part even in a narrow joint, and it is possible to insert the grout injection tool into the joint and fill the back of the joint without cutting the joint with a drill or the like. As a result, even if the masonry as a whole has joint openings or loosening, but the joint openings are locally narrow, it is possible to inject grout into the joint without cutting the joint, improving the work efficiency of repair work. In addition, since there is no need to cut the joint with a drill or chipping tool, unnecessary vibrations and impacts are not applied to the masonry, and it is possible to safely carry out repair work even in masonry where deformation due to earth pressure etc. has progressed and the masonry has become loose overall or in parts.

[0032] According to the masonry repair method of the present invention, it is possible to inject grout into the joints without cutting the joints with a drill or the like, improving the work efficiency of the repair work. Also, by first deciding the joints to inject grout into, inserting the tip of the grout injection tool into those joints, and then injecting grout into the joints from the connecting pipe of the inserted grout injection tool through the grout injection hose by a grout pressure pump, it is possible to efficiently inject grout into the joints, improving the work efficiency of the repair work. Also, since the grout injection tool that has been used is removed from the joints and collected in the injection tool removal process, it is possible to reuse the grout injection tool, and the same grout injection tool can be used repeatedly to perform grout injection work for each certain section of the masonry retaining wall. [Brief description of the drawings]

[0033] [Figure 1] FIG. 1 is a diagram showing a grout injection tool according to a first embodiment of the present invention; (a) left and right side views, (b) front and back views, (c) upper right front oblique view, (d) plan view, (e) bottom view, and (f) AA cross-sectional view. [Diagram 2] This is a diagram showing the state in which the tip of the grout injection tool 1 is inserted into the joints between each stone of a stone retaining wall. [Diagram 3] 1 is a diagram showing a state in which the tip of a grout injection hose 13 is inserted into a connection pipe portion 3 of a grout injection tool 1. FIG. [Figure 4] 1 is a diagram showing a state in which the tip portion 2 of the grout injection tool 1 is inserted into a joint before the tip of the grout injection hose 13 is inserted into the grout injection tool 1. FIG. [Diagram 5] FIG. 2 is a diagram showing a state in which the tip of a grout injection hose 13 is inserted into a grout injection tool 1 when the joint width is narrow. [Figure 6] FIG. 2 is a diagram showing a state in which the tip of a grout injection hose 13 is inserted into a grout injection tool 1 when the joint width is wide. [Figure 7] FIG. 5 is a diagram showing a grout injection tool according to a second embodiment of the present invention; (a) left and right side views, (b) front and back views, (c) upper right front oblique view, (d) plan view, (e) bottom view, and (f) AA cross-sectional view. [Figure 8] FIG. 11 is a left and right side view, a front and rear view, a front right bottom perspective view, and a front cross-sectional view of a grout injection tool according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a left and right side view, a front and rear view, a front right bottom perspective view, and a front cross-sectional view of a grout injection tool of a fourth embodiment of the present invention. [Figure 10] FIG. 11 is a left and right side view, a front and rear view, a front right bottom perspective view, and a front cross-sectional view of a grout injection tool of a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. EXAMPLES

[0035] FIG. 1 shows (a) left and right side views (because it is symmetrical, the right side view and the left side view are the same, and therefore referred to as "left and right side views". The same applies to other embodiments below), (b) front and back views (because it is symmetrical from front to back, the front view and the back view are the same, and therefore referred to as "front and back views". The same applies to other embodiments below), (c) front upper right oblique view, and (d) front cross-sectional view (referring to the AA cross-sectional view. The same applies to other embodiments below).

[0036] In FIG. 1, the grout injection tool 1 of this embodiment is made of a flexible member and includes a cylindrical leading portion 2 having a flat tip end, a cylindrical connecting pipe portion 3 connected to the base end of the leading portion, and an outlet 4 formed at the tip of the leading portion. The leading portion 2 has a cross-sectional shape at the base end that is approximately circular, and a cross-sectional shape at the tip end that is a flat convex closed curve that is long in the left and right directions. In addition, flexible resin sheets such as polyethylene and polystyrene, and flexible rubber sheets of natural or synthetic rubber are used as the flexible member constituting the leading portion 2, but it is preferable to use transparent or semi-transparent flexible resin sheets in order to make it easier to see inside from the outside. The connecting pipe portion 3 is a hard cylindrical pipe, and the tip side is inserted up to the center of the leading portion 2. This connecting pipe portion 3 is made of a hard material such as a hard resin such as hard polyvinyl chloride or a metal. The base end side of the leading portion 2 is bonded to the outer surface of the connecting pipe portion 3 at the bonding portion 2a. The tip of the leading portion 2 is open all over and forms a spout 4 (see FIG. 1(e)).

[0037] Next, we will explain a masonry repair method in which the grout injection tool 1 of Example 1 configured as described above is used to repair a masonry retaining wall by injecting and hardening grout into a cavity formed inside (behind the joints) of the masonry retaining wall constructed by piling up piled stones.

[0038] First, if there are plants growing in the joints of the masonry retaining wall, they are removed, and if there are plant roots, they are incinerated and removed with a burner. Then, the tip of the tip part 2 of the grout injection tool 1 is inserted into the joints that have opened between each stone of the masonry retaining wall due to deformation caused by loosening of the stones. Figure 2 shows the state in which the tip of the grout injection tool 1 has been inserted into the joints 11 that have opened between each stone 10 of the masonry retaining wall. From the viewpoint of work efficiency, as shown in Figure 2, the masonry retaining wall is divided into certain work sections, and multiple grout injection tools 1 are inserted into each joint within each work section.

[0039] Next, the tip of the grout injection hose 13 connected to the discharge port 12a of the grout pressure pump 12 is inserted into the connection pipe 3 of the grout injection tool 1 inserted into each joint. Here, a joint may be provided at the tip of the grout injection hose 13 to jointly connect the tip of the grout injection hose to the connection pipe 3, but from the viewpoint of work efficiency, it is preferable to make the outer diameter of the grout injection hose 13 smaller than the inner diameter of the connection pipe 3 and insert the tip of the grout injection hose 13 directly into the connection pipe 3. In this case, a flexible and deformable soft resin hose (e.g., soft vinyl hose, etc.) made of soft polyvinyl chloride or the like is used as the grout injection hose 13. FIG. 3 shows the state in which the tip of the grout injection hose 13 is inserted into the connection pipe 3 of the grout injection tool 1. FIG. 3 shows an example of masonry repair work performed by two workers P1 and P2. Worker P1 is an operator who inserts the tip of the grout injection hose 13 into the grout injection tool 1 to perform the grout injection work, and worker P2 is an operator who follows the instructions of worker P1 to start / stop the grout pressure-feeding pump 12 and replenish the grout to be pressure-fed.

[0040] Next, while worker P1 has inserted the tip of the grout injection hose 13 into the grout injection tool 1, worker P2 starts the grout pressure-feed pump 12 and pressure-feeds grout to the grout injection tool 1 through the grout injection hose 13, causing the grout to be poured into the joint from the outlet 4 of the leading-in part 2 of the grout injection tool 1, filling the space in the joint with grout. When filling is complete, worker P2 stops the grout pressure-feed pump 12, and worker P1 inserts the tip of the grout injection hose 13 into the next grout injection tool 1, and repeats the same grout injection work. In this way, grout injection work is performed for all grout injection tools 1 inserted into each joint.

[0041] When the grout injection work is completed, the worker P1 removes the grout injection tools from the joints. Then, he reinserts each of the removed grout injection tools 1 into the joints of other work sections where the grout injection work has not yet been completed, and continues the grout injection work by the same procedure as above. In this way, the grout injection work is completed for the entire joints of the masonry retaining wall.

[0042] As described above, this method does not require drilling or chipping the narrow joints during grout injection work, so repair work can be carried out efficiently and safely without applying unnecessary vibration or impact to the masonry during repair work. In addition, the grout injection tool 1 used in the previous work area can be removed from the joint and collected for reuse in the next work area, so repair work can be carried out at a lower cost than when a hard injection pipe is left in the joint as in the past.

[0043] Here, the detailed steps for inserting the tip of the grout injection hose 13 into the grout injection tool 1 will be additionally explained.

[0044] FIG. 4 is a diagram showing the state in which the leading-in part 2 of the grout injection tool 1 is inserted into the joint before the tip of the grout injection hose 13 is inserted into the grout injection tool 1. Since the tip of the leading-in part 2 is formed in a flat shape, the tip of the leading-in part 2 can be easily inserted into the joint even if the joint width is narrow. Since the leading-in part 2 is made of a flexible material, the leading-in part 2 inserted into the joint deforms to conform to the shape of the joint, and the tip is in a crushed state as shown in FIG. 4. In addition, since the hard connection pipe part 3 is inserted up to near the center of the leading-in part 2, the center of the leading-in part 2 is not crushed and maintains a constant width.

[0045] In this state, the tip of the grout injection hose 13 is inserted into the grout injection tool 1. FIG. 5 is a diagram showing the state in which the tip of the grout injection hose 13 is inserted into the grout injection tool 1 when the joint width is narrow. When the joint width is narrow, the tip of the grout injection hose 13 protrudes from the tip of the connection pipe part 3 into the front-in part 2, but because the joint width is narrow, it does not enter the back of the joint and is stopped just before the joint or near the opening. In this case, the front-in part 2 is pushed outward from the inside by the tip of the grout injection hose 13, so that the outer surface of the front-in part 2 is in close contact with the inner wall of the joint to close the gap. Therefore, if grout is poured from the tip of the grout injection hose 13 in this state, the grout is poured from the pouring outlet 4 to the back of the joint, and the grout is prevented from protruding from the joint before the space behind the joint is sufficiently filled with grout.

[0046] On the other hand, FIG. 6 is a diagram showing a state in which the tip of the grout injection hose 13 is inserted into the grout injection tool 1 when the joint width is wide. When the joint width is wide, the tip of the grout injection hose 13 is inserted until it protrudes from the outlet 4. At this time, the tip of the grout injection hose 13 is inserted while being deformed using the inner wall of the leading-in part 2 as a guide, so that the insertion work is easily performed. Also, as in the case of a narrow joint width, the leading-in part 2 is pushed outward from the inside by the tip of the grout injection hose 13, so that the outer surface of the leading-in part 2 is in close contact with the inner wall of the joint to close the gap. Therefore, if grout is poured out from the tip of the grout injection hose 13 in this state, grout can be directly injected from the grout injection hose into the space behind the joint, making it possible to inject grout into the joint more reliably and efficiently, and also suppressing the grout from protruding from the joint before the space behind the joint is sufficiently filled with grout. EXAMPLES

[0047] Fig. 7 shows (a) left and right side views, (b) front and back views, (c) front upper right perspective view, (d) plan view, (e) bottom view, and (f) front cross-sectional view (AA cross-sectional view) of a grout injection tool according to a second embodiment of the present invention. In Fig. 7, parts corresponding to those in Fig. 1 are given the same reference numerals.

[0048] In the grout injection tool 1 of this embodiment, the leading-in portion 2 is configured so that the tip side is flat and the center of the tip side protrudes in an arc shape. Also, the pouring outlet 4 is formed as an opening at the tip of the leading-in portion 2. In this way, by forming the tip side of the leading-in portion 2 to have the center of the tip side protrude in an arc shape, the work of inserting the tip of the leading-in portion 2 into the joint becomes easier and the work efficiency is improved. EXAMPLES

[0049] Fig. 8 shows (a) left and right side views, (b) front and back views, (c) front right lower perspective view, and (d) front cross-sectional view of a grout injection tool according to a third embodiment of the present invention. In Fig. 8, parts corresponding to those in Fig. 1 are given the same reference numerals.

[0050] In the grout injection tool 1 of this embodiment, the leading-in portion 2 is configured so that the tip side has a flat shape and the tip edge is inclined relative to the central axis. Also, the outlet 4 is formed as an opening at the tip of the leading-in portion. In this way, by configuring the shape of the tip edge of the leading-in portion 2 so that the tip edge is inclined relative to the central axis (the central axis of the grout injection tool 1, i.e., the central axis of the cylindrical connecting pipe portion 3), the work of inserting the tip of the leading-in portion 2 into the joint becomes easier and the work efficiency is improved. EXAMPLES

[0051] 9A shows left and right side views, (b) front and back views, (c) front right lower perspective view, and (d) front cross-sectional view of a grout injection tool according to a fourth embodiment of the present invention. In FIG. 9, parts corresponding to those in FIG. 1 are given the same reference numerals.

[0052] In the grout injection tool 1 of this embodiment, the leading-in part 2 is formed in a cylindrical shape as a whole with a flattened tip side, and a sealing part 5 is formed by sealing the center of the tip side. In addition, the pouring outlet 4 is formed as an opening at the left and right corners of the tip side of the leading-in part 2. In this way, by forming the pouring outlet 4 as an opening at the left and right corners of the tip side of the leading-in part 2, the grout injected into the joint can be poured in both directions within the joint. In addition, since the sealing part 5 is flat, the work of inserting the tip of the leading-in part 2 into the joint is facilitated, improving the work efficiency.

[0053] In addition, Figure 9 shows an example in which the pouring outlet 4 is formed as an opening at the left and right corners of the tip edge of the leading-in portion 2, but if it is desired to pour in only one direction, the pouring outlet 4 may be configured to be formed as an opening at either the left or right corner of the tip edge of the leading-in portion 2. EXAMPLES

[0054] Fig. 10 shows (a) left and right side views, (b) front and back views, (c) front right lower perspective view, and (d) front cross-sectional view of a grout injection tool according to a fifth embodiment of the present invention. In Fig. 10, parts corresponding to those in Fig. 1 are given the same reference numerals.

[0055] In the grout injection tool 1 of this embodiment, the leading-in part 2 is formed in a cylindrical shape as a whole with a flattened tip, and a sealing part 5 is formed at the center of the tip edge. In addition, the pouring outlet 4 is formed as an opening on the left and right side surfaces of the leading-in part 2 on the tip side. In this way, by forming the pouring outlet 4 as an opening on the left and right side surfaces of the leading-in part 2, the grout injected into the joint can be poured in both directions within the joint. In addition, since the sealing part 5 is flat, the work of inserting the tip of the leading-in part 2 into the joint is facilitated, improving work efficiency.

[0056] In addition, Figure 10 shows an example in which the pouring outlet 4 is formed as an opening on the left and right side surfaces at the tip of the leading-in portion 2, but if it is desired to pour in only one direction, the pouring outlet 4 may be configured to be formed as an opening on either the left or right side surface at the tip of the leading-in portion 2. [Explanation of symbols]

[0057] 1 Grout injection tool 2 Advance section 3 Connection pipe section 4 spout 5 Sealing part 10 stacked stones 11 Joint 12 Grout pump 12a Discharge port 13 Grout injection hose

Claims

1. A cylindrical leading-in portion made of a flexible member and having a flat tip end, A cylindrical connecting pipe portion connected to a base end side of the leading-in portion; A spout formed at the tip of the leading portion; A grout injection tool comprising:

2. The leading end portion is configured to have a flat shape at the tip side and a shape in which the center of the tip side protrudes in an arc shape, The pouring outlet is formed at the tip of the leading portion.

2. The grout injection tool according to claim 1 .

3. The leading end portion is configured to have a flattened tip end and a tip side thereof is inclined with respect to a central axis, The pouring outlet is formed at the tip of the leading portion.

2. The grout injection tool according to claim 1 .

4. The leading portion is formed in a cylindrical shape with a flat tip end and a sealed central portion of the tip end side, The spout is formed as an opening at one or both of the left and right corners of the tip side of the leading portion.

2. The grout injection tool according to claim 1 .

5. The leading end portion has a flat shape at its leading end and a sealed leading end edge. The spout is formed as an opening on one or both of the left and right side surfaces at the tip end of the leading portion.

2. The grout injection tool according to claim 1 .

6. A masonry repair method for repairing a masonry wall by injecting grout into a cavity formed inside the masonry wall and hardening the grout, An injection tool setting step of inserting a tip portion of the groove injection tool according to any one of claims 1 to 5 into a joint between each stone of a masonry retaining wall; A hose connection process of inserting the tip of a grout injection hose connected to the discharge port of a grout pump into the connection pipe of the grout injection tool inserted into the joint, or connecting the tip of the grout injection hose; A grout filling process in which grout is pumped to a grout injection tool through a grout injection hose to inject grout into the joint from an injection outlet of the grout injection tool to fill the space in the joint with grout; A grout injection tool removal step of removing the grout injection tool from the joint after filling the space in the joint with grout; A stone masonry repair method comprising the steps of:

7. In the hose connecting step, 7. A masonry repair method according to claim 6, characterized in that the tip of the grout injection hose is inserted into the connecting pipe of the grout injection tool, and the tip of the grout injection hose is used to push open the leading-in portion of the grout injection tool from the inside, thereby bringing the inner wall of the entrance portion of the joint and the outer wall of the leading-in portion into tight contact with each other.

8. The grout injection tool is a grout injection tool according to any one of claims 1 to 3, In the hose connecting step, 7. The masonry repair method according to claim 6, characterized in that the tip of the grout injection hose is inserted into the connecting pipe portion of the grout injection tool, and the tip of the grout injection hose is inserted into the inside of the joint using the inner wall of the leading-in portion of the grout injection tool as a guide until the tip of the grout injection hose protrudes from the outlet at the tip of the leading-in portion of the grout injection tool.

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