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 plug body used when filling grout in a mortar-filled steel bar joint. This plug body is fitted to the opening of a connecting pipe or a communication hole attached to a grout discharge port when filling grout such as mortar from a grout injection port of a mortar-filled steel bar joint, and discharges muddy liquid containing a cement component into air or scattered water, while preventing the leakage of grout and preventing dirt on the surface of the building, etc., and is used for the purpose of preventing such problems.

Background Art

[0002] The mortar-filled steel bar joint was developed as a steel bar joint for reinforcing concrete members arranged inside precast reinforced concrete members, etc., and its application target is not limited to precast reinforced concrete, but has come to be widely applied to in-situ concrete as well.

[0003] FIG. 4 shows an example of a construction method in the case of applying a mortar-filled steel bar joint to the erection of a precast concrete column, showing a construction example of the simultaneous injection method.

[0004] In this example, a plurality of sleeves 12 constituting a mortar-filled steel bar joint are embedded in the lower end portion of a PCa column 11 (precast concrete column), and the lower end portions of the main steel bars 13 of the PCa column are set so as to be located substantially at the center in the axial direction of the sleeve 12.

[0005] This PCa column 11 is hoisted into the construction position, and each foundation-side steel bar 15 protruding from a predetermined position of the foundation-side concrete 14 in advance is fitted into each sleeve 12 embedded in the lower end portion of the PCa column 11. In addition, sealing is performed on the outer peripheral portion of the joint position between the PCa column 11 and the foundation-side concrete 14 with a mortar form 16 or a wooden form, etc., so that grout such as mortar to be filled does not leak.

[0006] On the outer peripheral surface of the lower end of the PCa column 11, an injection port 17 for previously injecting grout and a discharge port 18 for confirming the filling of the grout and discharging excess air and moisture are provided. These injection port 17 and discharge port 18 are communicated with the outer peripheral surface of the PCa column 11 through a communication pipe 19 made of a PVC pipe or the like.

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

[0008] When filling the grout, the grout that first comes out from the opening of the PCa column 11 through the communication pipe 19 is a muddy liquid rich in cement paste. Slight separation occurs in the injected grout, and the cement paste, which is a light component, tends to gather at the injection tip. By using the stopper body A that forms a slight gap, mainly only the muddy liquid can be discharged, and the sound grout from which excessive moisture has been removed can be prevented from being discharged.

[0009] After the sound grout is filled in the sleeve 12, usually, the state is maintained as it is for about several hours to one day. The stopper body A is removed when the grout has solidified to a certain extent (for example, when about 2 to 3 hours have passed) after the injection of the grout is completed. After being washed with water or the like, it is diverted. Instead, a dedicated rubber stopper or the like with airtightness (not shown) is fitted to the drain port 17 portion to prevent the leakage of the grout, and after the fluidity of the grout is lost, the rubber stopper or the like is removed.

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

[0011] In Patent Document 1, as shown in Fig. 5(a), it consists of a rubber frustum-shaped plug body 31 and a piston body 35. The plug body 31 has a through-hole 34 penetrating along the axis. The piston body 35 consists of a shaft body, a pressure-receiving plate 36 provided at one end thereof, and a retaining plate 37 provided at the other end. The shaft body of the piston body 35 is loosely inserted into the through-hole 34 of the plug body 31, and the pressure-receiving plate 36 is located outside the inner end face of the plug body 31, and the retaining plate 37 is located outside the outer end face of the plug body 31 to form a combined stop plug body.

[0012] In the stop plug body described in this Patent Document 1, the initially emerging muddy liquid is discharged through the gap between the communication pipe 38 communicating with the discharge port of the mortar-filled steel bar joint and the pressure-receiving plate 36 and the gap between the through-hole 34 and the shaft body 35. At this time, since the retaining plate 37 is separated from the outer end face 33, it does not prevent the discharge.

[0013] The force pushing the pressure-receiving plate 36 by the muddy liquid is weak, and the pressure-receiving plate 36 does not move much. However, when normal grout comes out of the discharge port, the force of this grout pushing the pressure-receiving plate 36 is strong, and the pressure-receiving plate 36 is pressed against the inner end face 32 of the plug body 31. As a result, the opening of the gap between the through-hole 34 and the shaft body 35 is blocked, and the discharge of the grout naturally stops.

[0014] In addition, the outlet of the muddy liquid discharged outside the PC member is not flush with the outer wall surface of the member and protrudes slightly therefrom, so it does not flow down along the outer wall surface of the member and does not contaminate the outer wall surface. The flowing-down muddy liquid is received by a receiver such as a beaker. Also, after the injected grout loses its fluidity, the stop plug body is recovered and reused.

[0015] The plug body 41 described in Patent Document 2 is an improvement of the plug body described in the above-mentioned Patent Document 1. It communicates with the grout discharge port of the mortar-filled steel bar joint embedded in the reinforced concrete, and one end thereof is a plug body 41 fitted to the opening of a communication pipe or a communication hole that opens to the outside. It is composed of a hard plug body 42 having a through hole 49 and an elastic shaft body 46 movably inserted into the through hole 49, and a piston body 46 composed of a pressure receiving body 44 at one end and a retaining end portion 45 at the other end provided at positions protruding from the plug body 42 of the shaft body 46. The retaining end portion 45 is formed such that the maximum lateral width H including the shaft body 46 in the direction orthogonal to the shaft body 46 is the same as or slightly larger than the inner diameter w of the through hole 49.

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

[0017] In Patent Document 3, without providing the through hole provided in the plug bodies described in the above-mentioned Patent Documents 1 and 2 to confirm that the grout injected into the joint has reached the discharge port, as a plug body capable of detecting the completion of grout injection, a plurality of grooves 55 with an appropriate cross-sectional shape (for example, triangular) are provided along the entire length of the inclined surface of a solid truncated cone-shaped plug body 51, and air, water, and muddy water that precede the grout are discharged to the outside through these grooves 55. By confirming the moisture leaking from the plug body 51, a plug body is disclosed that is configured to confirm the filling of the grout and stop the grout injection.

Prior Art Documents

Patent Documents

[0018]

Patent Document 1

Patent Document 2

Patent Document 3

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0019] The stopper body described in Patent Document 1 mentioned above is not easy to assemble and is also difficult to clean and reuse. Also, in the invention described in Patent Document 2 which improved this, since a through-hole through which a piston body penetrates is formed in the stopper body, there is a problem that it takes time to clean solidified matter including cement adhered during reuse.

[0020] In response to such problems, the stopper body described in Patent Document 3 does not have a through-hole or a piston body, and a plurality of grooves extending in the axial direction over the entire length are formed on the outer peripheral surface of the rubber stopper body. However, during reuse, it is necessary to clean solidified matter including cement that has entered the grooves, and although it has been improved, there is still a problem that it takes a certain amount of time to clean.

[0021] Also, for any of the stopper bodies described in Patent Documents 1 to 3, air or a muddy liquid containing cement components is discharged through the gap between the stopper body and the communication pipe or the communication hole, and when attaching the stopper body to the communication pipe or the communication hole of the stopper body, delicate adjustment of the pushing-in degree is required.

[0022] In the case of a skilled operator, this operation does not cause much of a problem. However, when an inexperienced operator attaches the stopper body, depending on the pushing-in degree, the stopper body may easily come off when grout is injected, or conversely, it may be difficult to remove if pushed in too much.

[0023] The present invention aims to solve these problems, and provides a stopper body that is easier to clean for reuse compared to conventional stopper bodies, can be easily attached even by an inexperienced operator, and can also be easily removed.

MEANS FOR SOLVING THE PROBLEMS

[0024] The present invention relates to a conical plug body that communicates with a grout discharge port of a mortar-filled steel bar joint embedded in reinforced concrete and is fitted to an opening of a communication pipe or a communication hole that opens to the outside. A plurality of protrusion portions extending in the axial direction of the plug body are formed on the outer peripheral surface of the small-diameter end side of the plug body, and a predetermined range of the top portion of the protrusion portion is in contact with the inner peripheral surface of the communication pipe or the communication hole.

[0025] Since the plug body of the present invention has a substantially simple truncated cone shape except for a plurality of protrusion portions, cleaning of solids containing cement components adhering to the surface after use is much easier than that of the plug body used for the same purpose in the past.

[0026] As described in the background art section, after the injection of grout such as mortar into the sleeve of the mortar-filled steel bar joint is completed and the grout has hardened to a certain extent, for example, when about 2 to 3 hours have passed, the plug body of the present invention is removed, washed with water or the like, and then diverted. After removing the plug body of the present invention, a dedicated rubber plug or the like with airtightness is attached instead.

[0027] When the plurality of protrusion portions provided on the outer peripheral surface of the plug body are attached to the communication pipe or the communication hole, a predetermined range of the top portion thereof is in contact with the inner peripheral surface of the communication pipe or the communication hole, and the friction at the contact portion can prevent or suppress the plug from coming out during attachment or grout filling. The predetermined range of the top portion mentioned here is not particularly limited, but it is a range in which friction is obtained to such an extent that the plug body does not easily come out when the plug body is attached to the communication pipe or the like, and a range in which it does not cause a major obstacle to the insertion or removal of the plug body into the communication pipe.

[0028] By making the portion other than the top of the protrusion portion have a tapered shape that gradually narrows toward the small-diameter side end of the plug body, it becomes easy to attach the plug body to the communication pipe or the like.

[0029] The material of the plug is not particularly limited, but hard rubber has often been used conventionally. By molding the outer diameter of the circle connecting the tops of the plurality of protruding ridges to be the same as or preferably slightly larger than the inner diameter of the communication pipe or communication hole, the elasticity of the hard rubber itself is added, and the plug body can be prevented from coming out.

[0030] When filling the grout into the mortar-filled rebar joint, the air and muddy liquid first discharged from the discharge port pass through the gap between the protruding ridges on the outer peripheral surface of the plug body and the inner surface of the communication pipe or communication hole, and are discharged from the gap on the opening side to the outer surface of the rebar concrete member of the communication pipe or communication hole.

[0031] Thereafter, the leakage of the sound grout with low fluidity is prevented by this narrow gap, and the injection of the grout is completed.

[0032] Since the plug body of the present invention has a shape in which a plurality of protruding ridges are provided on the outer peripheral surface of the small-diameter end side of a substantially simple truncated cone as described above, when attaching it to the communication pipe or communication hole, it can be easily attached without applying a particularly large force by pushing it in while rotating around the axis of the plug body. Also, as described above, the slipping out during attachment or grout filling is prevented or suppressed by the friction at the contact portion with the inner surface of the communication pipe or communication hole.

[0033] In addition, since the contact area itself between the protruding ridge and the inner surface of the communication pipe or communication hole is small, when removing it for reuse when the grout has solidified to a certain extent, it can be easily removed without applying a particularly large force by pulling it out while rotating around the axis of the plug body.

[0034] In the state where the stopper body is attached to the communication pipe or communication hole, it is necessary to create a gap between the outer peripheral surface of the stopper body and the inner surface of the communication pipe or communication hole at the opening position on the outer surface of the reinforced concrete member of the communication pipe or communication hole. However, for the large-diameter side end of the stopper body, that is, the rearmost part, by forming it to be larger than the inner diameter of the communication pipe or communication hole, it is possible to prevent the stopper body from being completely fitted inside the communication pipe or communication hole and becoming difficult to remove.

Advantages of the Invention

[0035] Since the stopper body of the present invention has a substantially simple truncated cone shape except for the plurality of ridge portions, cleaning of solids containing cement components adhering to the surface after use is much easier compared to stopper bodies used for the same purpose in the past.

[0036] In the stopper body of the present invention, due to the friction at the contact portion between the plurality of ridge portions provided on the outer peripheral surface and the inner surface of the communication pipe or the like, it is possible to prevent or suppress the stopper body from coming out during installation or grout filling.

[0037] By making the water stop plug made of hard rubber and making the outer diameter of the circle connecting the tops of the plurality of ridge portions the same as or slightly larger than the inner diameter of the communication pipe or the like, the elasticity of the hard rubber itself is added, making the stopper body more difficult to come out.

[0038] Since the stopper body of the present invention has a shape in which a plurality of ridge portions are provided on the outer peripheral surface on the small-diameter end side of a substantially simple truncated cone, when attaching it to the communication pipe or communication hole, it can be easily attached without applying a particularly large force by pushing it in while rotating it around the axis of the stopper body, and the friction at the contact portion with the inner surface of the communication pipe or the like can prevent or suppress the coming out during installation or grout filling.

[0039] Also, since the contact area itself between the ridge portion and the inner surface of the communication pipe or the like is small, when removing it for reuse when the grout has hardened to a certain extent, it can be easily removed without applying a particularly large force by pulling it out while rotating it around the axis of the stopper body.

Brief Description of the Drawings

[0040]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0041] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

[0042] FIG. 1 shows a state where, in one embodiment of the plug body of the present invention, the plug body 1 is attached to the opening of a communication pipe 9 made of a PVC pipe or the like that communicates with a grout discharge port. FIGS. 2(a) to (c) are respectively the front view, left side view, and right side view of the plug body of FIG. 1.

[0043] On the outer peripheral surface of the small diameter end side of the plug body 1 of the present invention, a plurality of protruding strip portions 2 (four protruding strip portions in this example) extending in the axial direction of the plug body 1 are formed. As shown in FIG. 1, the top portions 2a of the protruding strip portions 2 are in contact with the inner peripheral surface of the communication pipe 9.

[0044] As shown in FIG. 2, since the stopper body 1 has a substantially simple frustoconical shape except for the ridge portion 2, cleaning of solids containing cement components adhering to the surface after use is easier than that of stopper bodies used for the same purpose in the past.

[0045] When these ridge portions 2 provided on the outer peripheral surface of the stopper body 1 are attached to the communication pipe 9, the top portion 2a thereof comes into contact with the inner peripheral surface of the communication pipe 9, and slipping out during attachment or grout filling can be suppressed by the friction at the contact portion.

[0046] As the material of the water stop plug 1, a conventionally common hard rubber is suitable. By forming the outer diameter of the circle connecting the top portions 2a of the ridge portions 2 to be the same as or preferably slightly larger than the inner diameter of the communication pipe 9, the elasticity of the hard rubber itself is added, making it difficult for the stopper body 1 to slip out.

[0047] In the present embodiment, the portion other than the top portion 2a of the ridge portion 2 has a tapered shape that gradually narrows toward the small-diameter side end 1a of the stopper body 1 so as to facilitate attachment to the communication pipe 9.

[0048] When filling grout such as mortar into a mortar-filled steel bar joint, the air and muddy liquid first discharged from the discharge port pass through the gap between the ridge portions 2 on the outer peripheral surface of the stopper body 1 and the inner surface of the communication pipe 9, and are discharged from the gap on the opening side to the outer surface of the reinforced concrete member of the communication pipe 9.

[0049] Thereafter, the leakage of the sound grout with low fluidity is prevented by this narrow gap, and the injection of the grout is completed.

[0050] Since the stopper body 1 of the present invention has a shape in which a plurality of ridge portions 2 are provided on the outer peripheral surface of the small-diameter end side of a substantially simple frustoconical shape as described above, when attaching to the communication pipe 9, it can be easily attached without applying a particularly large force by pushing it in while rotating around the axis of the stopper body 1.

[0051] In addition, since the contact area itself between the protruding strip portion 2 and the inner surface of the communication pipe 9 is small, when the grout has hardened to a certain extent, even when removing it for reuse, it can be easily removed without applying a particularly large force by pulling it out while rotating it around the axis of the stopper body 1.

[0052] Moreover, in this embodiment, regarding the large-diameter side end 1b of the stopper body 1, that is, the rearmost part, it is larger than the inner diameter of the communication pipe 9, so that the stopper body 1 is prevented from being completely fitted inside the communication pipe 9 and becoming difficult to remove.

[0053] FIG. 3 is a view showing the end face on the small-diameter side in another embodiment of the present invention. FIG. 3(a) shows the case where three protruding portions 2 are provided, FIG. 3(b) shows the case where six protruding strip portions 2 are provided, and (c) shows the case where four wide protruding strip portions 2 are provided.

[0054] If there are three or more locations in the circumferential direction of the protruding strip portion 2 of the stopper body 1, it is easy to align it with the center of the communication pipe or the like and it is stable. By providing a large number of protruding strip portions 2, the frictional force can be increased, but if there are too many, the attachment and removal will become troublesome, and it will also be difficult to mold and time-consuming to clean.

[0055] In addition, the width and length of the protruding strip portion 2 can be determined in consideration of the size and material of the stopper body 1, the friction with the communication pipe or the communication hole, and the like.

Explanation of Reference Numerals

[0056] A... stopper body 1... stopper body, 1a... small-diameter side end, 1b... large-diameter side end 2... protruding strip portion, 2a... top 9... communication pipe 11... PCa column 12... sleeve 13... main reinforcing bar 14... foundation-side concrete 15... foundation-side reinforcing bar 16... mortar form 17... injection port 18... discharge port 19... communication pipe

Claims

1. A conical plug body that communicates with the grout outlet of a mortar-filled reinforcing bar joint embedded in reinforced concrete and is fitted to the opening of a communication pipe or communication hole that opens to the outside. A plurality of ridge portions extending in the axial direction of the plug body are formed only on the small-diameter end side of the outer peripheral surface of the plug body. The portion other than the portion where the ridge portions are formed has a substantially simple conical frustum shape. A predetermined range of the top of the ridge portion is in contact with the inner peripheral surface of the communication pipe or communication hole, and the portion other than the top of the ridge portion has a tapered shape that gradually tapers toward the small-diameter side end of the plug body. The plug body is characterized by this.

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

3. The plug body according to claim 1, wherein the outer diameter of the large-diameter side end of the plug body is larger than the inner diameter of the communication pipe or communication hole.

Images