Plug body

Abstract

To provide a plug body that is easy to clean for reuse, easy for even inexperienced operators to attach, and also easy to remove.SOLUTION: A plug body 1 is in a conical shape made of hard rubber, etc., and has a plurality of protrusions 2 extending in an axial direction of the plug body formed on an outer peripheral surface of a small diameter end side. A top portion 2a of the protrusion contacts an inner peripheral surface of a connecting pipe 9 so that the plug body is prevented from falling out due to friction. The plug body is almost in a simple conical shape except for the protrusion. When the plug body is attached to the connecting pipe, it can be easily attached without applying a large amount of force by pushing it in while rotating it around an axis of the plug body 1. Because a contact area itself between the protrusion and an inner surface of the connecting pipe is small, it can be easily removed by rotating it around the axis of the plug body and pulling it out when removing it for reuse.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stopper used when filling a mortar-filled reinforcing bar joint with grout. This stopper is fitted into the opening of a connecting pipe or a communication hole attached to a grout outlet when filling grout such as mortar from a grout injection port of a mortar-filled reinforcing bar joint, and is used for the purpose of preventing leakage of grout and preventing contamination of the surface of a building while discharging muddy liquid containing cement components in air or water spray. [Background technology]

[0002] Mortar-filled rebar joints were developed as rebar joints for reinforcing concrete members placed inside precast reinforced concrete members, etc., and their application is not limited to precast reinforced concrete, but is also becoming widely used in cast-in-place concrete.

[0003] Figure 4 shows an example of a simultaneous injection method of construction as an example of a construction method when a mortar-filled rebar joint is applied to the erection of a precast concrete column.

[0004] In this example, multiple sleeves 12 that constitute mortar-filled reinforcing bar joints are embedded in the lower end of a PCa column 11 (precast concrete column), and the lower end of each main reinforcing bar 13 of the PCa column is set so as to be positioned approximately in the axial center of the sleeve 12.

[0005] This PCa column 11 is hung in the erection position, and each foundation side rebar 15, which has been made to protrude from a predetermined position in the foundation side concrete 14, is fitted into each sleeve 12 embedded in the lower end of the PCa column 11. The outer periphery of the joint between the PCa column 11 and the foundation side concrete 14 is sealed with a mortar form 16 or a wooden formwork, etc., to prevent the filling grout such as mortar from leaking.

[0006] An injection port 17 for injecting grout in advance and a drain port 18 for checking the filling of grout and discharging excess air and moisture are provided on the outer peripheral surface of the lower end of the PCa column 11, and these injection port 17 and drain port 18 are connected to the outer peripheral surface of the PCa column 11 by a connecting pipe 19 made of a PVC pipe or the like.

[0007] A stopper A made of hard rubber or the like is attached to the outlet 17 to prevent the filled grout from being discharged, and in this state, grout is injected from the injection port 17 using an electric pump (not shown) or the like. As the filling of the sleeve 12 with grout progresses, air inside the sleeve 12 is first discharged through the gap between the stopper A and the communicating pipe 19 or through a void formed in the stopper A.

[0008] When filling the grout, the grout that first comes out of the opening of the PCa column 11 through the communicating pipe 19 is a muddy liquid rich in cement paste. Some separation occurs in the grout during injection, and the light cement paste component tends to gather at the injection tip, but by using the stopper A that forms a small gap, this muddy liquid is mainly discharged and healthy grout with excess water removed is prevented from being discharged.

[0009] After the sleeve 12 is filled with sound grout, it is usually left in that state for several hours to a day. After the grout has been poured, the stopper A is removed when the grout has hardened to a certain extent (for example, after about 2 to 3 hours have passed), washed with water, etc., and then reused. A specially designed rubber stopper or the like (not shown) with sealing properties is fitted in place of the drainage port 17 to prevent leakage of the grout, and the rubber stopper or the like is removed after the grout has lost its fluidity.

[0010] As stopper A used when filling grout into such a mortar-filled reinforcing bar joint, the applicant has developed stopper bodies (see FIG. 5) described in, for example, Patent Documents 1 to 3.

[0011] Patent Document 1 discloses a stopper body comprising a rubber truncated cone-shaped stopper body 31 and a piston body 35, as shown in FIG. 5(a), in which the stopper body 31 has a through hole 34 passing through along the axis, and the piston body 35 comprises a shaft body, a pressure-receiving plate 36 provided at one end, and a stopper plate 37 provided at the other end, the shaft body of the piston body 35 being loosely inserted into the through hole 34 of the stopper body 31, with the pressure plate 36 positioned outside the inner end face of the stopper body 31 and the stopper plate 37 positioned outside the outer end face of the stopper body 31.

[0012] In the stopper described in Patent Document 1, the muddy liquid that comes out first is discharged through the gap between the pressure plate 36 and the connecting pipe 38 which is connected to the discharge port of the mortar-filled rebar joint, and through the gap between the through hole 34 and the shaft 35. At this time, however, the anti-slip plate 37 is separated from the outer end face 33 and does not hinder the discharge.

[0013] The muddy liquid exerts a weak force on the pressure plate 36, so the pressure plate 36 does not move much, but when normal grout comes out of the discharge port, the grout exerts a strong force on the pressure plate 36, pressing it against the inner end surface 32 of the plug 31. This closes the opening of the gap between the through hole 34 and the shaft 35, and the discharge of grout naturally stops.

[0014] In addition, the outlet of the muddy liquid discharged outside the PC component is not flush with the outer wall surface of the component, but protrudes slightly from it, so it does not flow down along the outer wall surface and does not contaminate the outer wall surface. The muddy liquid that flows down is collected in a receiver such as a beaker. After the injected grout loses its fluidity, the stopper body is collected and reused.

[0015] The stopper 41 described in Patent Document 2 is an improvement of the stopper described in Patent Document 1 mentioned above, and is a stopper 41 that communicates with the grout discharge port of a mortar-filled rebar joint buried in reinforced concrete and is fitted into the opening of a communicating pipe or communicating hole having one end open to the outside, and is composed of a hard elastic stopper 42 with a through hole 49, a shaft 46 that is freely inserted into the through hole 49, and a piston body 46 consisting of a pressure-receiving body 44 at one end and a stopper end 45 at the other end, both of which are provided at positions protruding from the stopper 42 of the shaft 46, and the stopper end 45 is formed so that the maximum width H including the shaft 46 in the direction perpendicular to the shaft 46 is the same as or slightly larger than the inner diameter w of the through hole 49.

[0016] Compared with the stopper described in Patent Document 1 mentioned above, this makes it easier to attach the piston body 46 to the stopper body 42 and to remove the piston body 46 from the stopper body 42 after use, thereby simplifying cleaning of the stopper body 41, particularly the inside of the through hole 49 and the piston body 46, and enabling repeated use.

[0017] Patent Document 3 discloses a stopper that can detect the completion of grout injection without providing the through hole that was provided in the stopper described in Patent Documents 1 and 2 above to confirm that the grout injected and filled in the joint has reached the discharge outlet.The stopper has a solid truncated cone stopper 51 and a plurality of grooves 55 of an appropriate cross-sectional shape (e.g., triangular) are provided along the entire length of the slope of the stopper, and air, water and muddy water preceding the grout are discharged to the outside through these grooves 55.The stopper is configured to confirm the filling of grout by checking for moisture leaking from the stopper 51 and to stop the grout injection. [Prior art documents] [Patent documents]

[0018] [Patent Document 1] Patent No. 3277482 [Patent Document 2] Patent No. 4870624 [Patent Document 3] Patent No. 7228300 Summary of the Invention [Problem to be solved by the invention]

[0019] The stopper described in the above-mentioned Patent Document 1 is not easy to assemble, and is difficult to clean and reuse. Also, the invention described in Patent Document 2, which is an improvement over the above, has a through hole that passes through the piston body in the stopper, so there is a problem that it takes time to clean off the solidified matter, including the cement, that adheres to the stopper when it is reused.

[0020] In response to these issues, the stopper described in Patent Document 3 does not have any through holes or piston bodies, but instead has multiple grooves extending over the entire axial length of the outer peripheral surface of a rubber stopper. However, when the stopper is reused, solidified materials including cement that have gotten into the grooves must be cleaned off, and although this has been improved, the cleaning process still requires a fair amount of effort.

[0021] Furthermore, all of the stopper bodies described in Patent Documents 1 to 3 discharge a muddy liquid containing air and cement components through the gap between the stopper body and the communicating tube or communicating hole, and when attaching the stopper body to the communicating tube or communicating hole, delicate adjustments are required in how hard the stopper body is pushed in.

[0022] For experienced workers, this task does not pose much of a problem, but when an inexperienced worker installs the stopper, depending on how hard they push it in, the stopper may come off easily when the grout is injected, or conversely, they may push it in too hard, making it difficult to remove.

[0023] The present invention seeks to solve these problems and aims to provide a stopper body that is easier to clean for reuse than conventional stopper bodies, can be easily attached even by inexperienced workers, and is also easy to remove. [Means for solving the problem]

[0024] The present invention relates to a truncated cone-shaped stopper which communicates with the grout discharge outlet of a mortar-filled rebar joint embedded in reinforced concrete and is fitted into the opening of a communicating pipe or communicating hole which is open to the outside, and which is characterized in that a plurality of protrusions extending in the axial direction of the stopper are formed on the outer peripheral surface of the small diameter end side of the stopper, and a predetermined range of the tops of the protrusions are in contact with the inner peripheral surface of the communicating pipe or communicating hole.

[0025] Since the stopper of the present invention has an almost simple truncated cone shape except for the multiple protrusions, cleaning of solid matter, including cement components, adhering to the surface after use is much easier than with conventional stopper bodies used for similar purposes.

[0026] As described in the Background Art section, the stopper of the present invention is removed after the injection of grout such as mortar into the sleeve of a mortar-filled rebar joint is completed and the grout has hardened to a certain extent, for example, after about 2 to 3 hours have passed, and is reused after being washed with water, etc. After the stopper of the present invention is removed, a dedicated rubber stopper or the like with a tight seal is attached instead.

[0027] The plurality of ridges provided on the outer peripheral surface of the stopper are adapted to contact the inner peripheral surface of the communicating pipe or communicating hole at a predetermined range of their tops when the stopper is attached to the communicating pipe or communicating hole, and friction at the contact portion can prevent or suppress the stopper from coming out when the stopper is attached or when grout is filled in. The predetermined range of the top is not particularly limited, but is set to a range in which friction is obtained such that the stopper does not easily come out when the stopper is attached to the communicating pipe or the like, and which does not significantly impede the insertion or removal of the stopper from the communicating pipe.

[0028] The portion of the protrusion other than the apex has a tapered shape that narrows gradually toward the small diameter end of the stopper, which makes it easier to attach the stopper to a communicating pipe or the like.

[0029] The material of the stopcock is not particularly limited, but hard rubber has traditionally been used, and by molding the circle connecting the tops of the multiple protrusions so that the outer diameter is the same as, or preferably slightly larger than, the inner diameter of the communicating tube or communicating hole, the elasticity of the hard rubber itself is also added, and the stopcock body can be prevented from slipping out.

[0030] When filling a mortar-filled reinforcing bar joint with grout, the air and muddy liquid that are initially discharged from the outlet are discharged through the gap between the protrusions on the outer surface of the stopper body and the inner surface of the connecting pipe or connecting hole, and then through the gap on the opening side of the connecting pipe or connecting hole to the outer surface of the reinforced concrete member.

[0031] Thereafter, the leakage of the healthy grout, which has low fluidity, is prevented by the narrow gaps, and the grout injection is completed.

[0032] As described above, the stopper of the present invention has a shape in which multiple ridges are provided on the outer peripheral surface of the small diameter end side of an approximately simple truncated cone, so that when it is attached to a communicating pipe or communicating hole, it can be easily attached without applying a particularly large force by simply pushing it in while rotating it around the axis of the stopper, and as described above, friction at the contact point with the inner surface of the communicating pipe or communicating hole prevents or suppresses the stopper from coming loose during attachment or when filling with grout.

[0033] Furthermore, since the contact area between the protrusion portion and the inner surface of the communicating pipe or communicating hole is small, when the grout has hardened to a certain extent and the plug is to be removed for reuse, it can be easily removed without applying a large amount of force by simply rotating the plug around its axis and pulling it out.

[0034] When the stopper is attached to the communicating pipe or communicating hole, it is necessary to ensure that a gap is created between the outer surface of the stopper and the inner surface of the communicating pipe or communicating hole at the opening position of the communicating pipe or communicating hole to the outer surface of the reinforced concrete member. However, by molding the large diameter end of the stopper, i.e., the very rear part, to be larger than the inner diameter of the communicating pipe or communicating hole, it is possible to prevent the stopper from becoming completely stuck inside the communicating pipe or communicating hole and becoming difficult to remove. Effect of the Invention

[0035] Since the stopper of the present invention has an almost simple truncated cone shape except for the multiple protrusions, cleaning of solid matter, including cement components, adhering to the surface after use is much easier than with conventional stopper bodies used for similar purposes.

[0036] In the stopper of the present invention, friction at the contact points between the multiple protrusions provided on the outer peripheral surface and the inner surface of the communicating pipe, etc., prevents or inhibits the stopper from coming loose when being attached or when filling with grout.

[0037] By making the stopcock out of hard rubber and making the outer diameter of the circle connecting the tops of the multiple protrusions the same as or slightly larger than the inner diameter of the communicating pipe, etc., the elasticity of the hard rubber itself is also added, making it more difficult for the stopcock to come loose.

[0038] The stopper of the present invention has a shape in which multiple protrusions are provided on the outer peripheral surface of the small diameter end side of an approximately simple truncated cone. Therefore, when attaching the stopper to a communicating pipe or communicating hole, it can be easily attached by simply rotating the stopper around its axis and pushing it in without applying any particularly large force, and friction at the contact point with the inner surface of the communicating pipe, etc. can prevent or suppress the stopper from coming loose during attachment or when filling with grout.

[0039] In addition, since the contact area between the protrusion portion and the inner surface of the connecting pipe, etc. is small, when removing it for reuse once the grout has hardened to a certain extent, it can be easily removed without applying any particularly large force by simply rotating the stopper body around its axis and pulling it out. [Brief description of the drawings]

[0040] [Figure 1] FIG. 2 is an explanatory diagram showing a state in which the stopper is attached to an opening of a communication pipe that communicates with a grout discharge port in one embodiment of the stopper of the present invention. [Diagram 2] 2(a) to (c) are a front view, a left side view and a right side view, respectively, of the stopper body of FIG. [Diagram 3] 13A and 13B are diagrams showing the end face on the small diameter side in another embodiment of the present invention, where (a) shows the case where three protrusions are provided, (b) shows the case where six protrusions are provided, and (c) shows the case where four wide protrusions are provided. [Figure 4] FIG. 1 is an explanatory diagram of a conventional simultaneous injection method for simultaneously filling multiple filled-type rebar joints. [Diagram 5] 1(a) to 1(c) are explanatory diagrams of stoppers disclosed in Patent Documents 1, 2 and 3, which are prior art. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

[0042] Fig. 1 shows one embodiment of the stopper of the present invention, in which the stopper 1 is attached to the opening of a communication pipe 9 made of a PVC pipe or the like that communicates with a grout outlet. Figs. 2(a) to (c) are a front view, a left side view, and a right side view, respectively, of the stopper of Fig. 1.

[0043] The outer peripheral surface of the small diameter end of the stopper 1 of the present invention is formed with a plurality of ridges 2 (four ridges in this example) extending in the axial direction of the stopper 1, and as shown in Figure 1, the tops 2a of the ridges 2 are adapted to contact the inner peripheral surface of the communicating pipe 9.

[0044] As shown in FIG. 2, stopper 1 has a simple truncated cone shape except for protrusion 2, so that cleaning of solid matter, including cement components, adhering to the surface after use is easier than with conventional stopper bodies used for similar purposes.

[0045] These protrusions 2 provided on the outer peripheral surface of the stopper body 1 are designed so that when the stopper body 1 is attached to the communicating pipe 9, its top 2a comes into contact with the inner peripheral surface of the communicating pipe 9, and friction at the contact area prevents the stopper body 1 from coming loose when the stopper body 1 is attached or when the stopper body 1 is filled with grout.

[0046] Conventionally, general hard rubber has been suitable as the material for the stopcock 1, and by molding the circle connecting the tops 2a of the protrusions 2 so that the outer diameter of the circle is the same as the inner diameter of the communicating pipe 9 or preferably slightly larger, the elasticity of the hard rubber itself is also added, making the stopcock 1 less likely to come loose.

[0047] In this embodiment, the portion of the protrusion 2 other than the apex 2a has a tapered shape that gradually narrows toward the small diameter end 1a of the stopper 1 so as to facilitate attachment to the communicating pipe 9.

[0048] When filling a mortar-filled rebar joint with grout such as mortar, the air and muddy liquid that are initially discharged from the outlet pass through the gap between the protrusions 2 on the outer surface of the stopper 1 and the inner surface of the communicating pipe 9, and are discharged from the gap on the opening side of the communicating pipe 9 facing the outer surface of the reinforced concrete member.

[0049] Thereafter, the leakage of the healthy grout, which has low fluidity, is prevented by the narrow gaps, and the grout injection is completed.

[0050] Since the stopper 1 of the present invention has a shape in which multiple protrusions 2 are provided on the outer surface of the small diameter end side of an approximately simple truncated cone, when attaching it to the communicating pipe 9, it can be easily attached by simply rotating the stopper 1 around its axis while pushing it in, without applying any particularly large force.

[0051] Furthermore, since the contact area between the protrusion portion 2 and the inner surface of the communicating pipe 9 is small, when the grout has hardened to a certain extent, it can be easily removed for reuse by rotating the stopper body 1 around its axis and pulling it out, without applying any particularly large force.

[0052] In addition, in this embodiment, the large diameter end 1b of the stopper body 1, i.e., the very rear part, is larger than the inner diameter of the communicating tube 9, so that the stopper body 1 does not become completely stuck inside the communicating tube 9 and become difficult to remove.

[0053] Figure 3 shows the end face on the small diameter side in another embodiment of the present invention, where Fig. 3(a) shows the case where three protrusions 2 are provided, Fig. 3(b) shows the case where six protrusions 2 are provided, and Fig. 3(c) shows the case where four wide protrusions 2 are provided.

[0054] If the stopper 1 has three or more ridges 2 in the circumferential direction, it is easy to align it with the center of the communicating pipe, etc., and it is stable. By providing a large number of ridges 2, the frictional force can be increased, but if there are too many, it becomes difficult to attach and remove, it is difficult to mold, and cleaning is also time-consuming.

[0055] The width and length of the protrusion 2 can be determined taking into consideration the size and material of the stopper 1, friction with the communicating tube or communicating hole, and the like. [Explanation of symbols]

[0056] A…Stop plug 1...stopper body, 1a...small diameter side end, 1b...large diameter side end 2...projection, 2a...top 9…Communication pipe 11…PCa pillar 12...Sleeve 13…Main rebar 14…Concrete foundation 15…Foundation side rebar 16…Mortar frame 17...Inlet 18…Discharge port 19...Communication pipe

Claims

1. A truncated cone-shaped stopper that communicates with the grout discharge outlet of a mortar-filled rebar joint buried in reinforced concrete and is fitted into the opening of a communicating pipe or communicating hole that is open to the outside, wherein a plurality of protrusions extending in the axial direction of the stopper are formed on the outer peripheral surface of the small diameter end side of the stopper, and a predetermined range of the top of the protrusions is in contact with the inner peripheral surface of the communicating pipe or communicating hole.

2. 2. The plug according to claim 1, wherein said plug is made of hard rubber.

3. 2. The plug according to claim 1, wherein an outer diameter of the large-diameter end of the plug is larger than an inner diameter of the communicating tube or communicating hole.

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