JPH06100024B2 - Waterproof packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a water blocking packing used in a new construction method for constructing an underwater structure such as a pier or a standing tunnel for a submerged tunnel.

<Problems to be Solved by Conventional Techniques and Inventions> Recently, as a method of constructing an underwater structure such as the upright of a pier or a submerged tunnel, as shown in FIG.
A steel shell structure formwork F divided into a plurality of compartments B by F1 ... is manufactured on land, towed to the water above the construction site, and then each room is filled with water and submerged at the bottom of the construction site.
Next, a new construction method has been developed, in which the water in each of the above-mentioned sections is discharged one by one, and instead, concrete is placed one by one, and its implementation is planned. In addition, the figure is a formwork for constructing the pit of the submerged tunnel.
F2 ... indicates a partition wall for reinforcing the formwork, and F3 indicates a bottom plate.

In the above-mentioned construction method, as shown in FIG. 5, a plurality of threaded joint reinforcing bars S ... Embedded in a plurality of sections B ... Are arranged so as to penetrate the partition wall F1. As shown in FIG. 5, each threaded joint reinforcing bar S is fixed to the partitioning wall F1 by sandwiching the partitioning wall F1 from the front and back with nuts N, N screwed to the threaded joint reinforcing bar S. .

However, in the above structure, since water is not sufficiently shut off between the partition wall F1 and the thread-bar reinforcement S .... Water enters the drained section B from the adjacent non-drained section B, There is a risk of adversely affecting the hardening time of the concrete, the strength after hardening, or the threaded joint reinforcing bars S, etc. embedded in the cast concrete.

Therefore, it is possible to interpose an annular seal member such as an O-ring between the nut N and the partition wall F1. However, the tightening torque of the sealing member is limited because it is difficult to use a large wrench or the like that can be tightened with high torque for tightening the nut N because it is narrow within the section B of the mold F. (Usually about 4000 kg-cm). Therefore, as shown in FIG. 6, the sealing member is made to sufficiently follow the threaded joint reinforcing bar S which has complicated irregularities on the surface and is easily eccentric to the through hole of the partition wall F1. However, there is a problem that water cannot be reliably stopped between the partition wall and the threaded joint reinforcing bar.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a waterproof packing that can reliably stop water between the partition wall and the threaded joint bar even with a relatively low torque tightening force. I am trying.

<Means for Solving the Problems> The water-proof packing of the present invention for solving the above problems is entirely made of an elastic material made of rubber or plastic, and has a circular insertion hole through which a threaded reinforcing bar is inserted on the center side. With, at least the side end surface facing the partition wall, the center side where the insertion hole is formed, an annular packing member formed gradually thicker so as to project toward the partition wall,
The packing member is provided along the side end surface facing the nut, has a through hole through which the threaded bar reinforcing bar is inserted, and has an annular peripheral side wall surrounding the outer peripheral surface of the packing member at the peripheral portion. It is characterized by having a washer.

<Operation> In the water blocking packing of the present invention having the above configuration, the threaded bar reinforcing bar is inserted into the insertion hole with the packing member facing the partition wall, and then the threaded bar reinforcing bar is screwed from behind the washer. When tightening the attached nut, the inner thickness part of the packing member on the center side protruding toward the partition wall becomes
In the state that it bites into the complicated unevenness of the surface of the threaded joint reinforcing bar, it enters between the threaded joint reinforcing bar and the partition wall to stop the water between them.
Further, at the time of tightening, the peripheral side wall formed on the washer prevents the packing member from escaping to the outside.

<Example> Below, the waterproof packing of this invention is demonstrated, referring drawings which show an Example.

As shown in FIG. 1 (a), the water blocking packing P of this embodiment has an insertion hole H through which a threaded reinforcing bar is inserted on the center side, and the entire ring is made of an elastic material made of rubber or plastic. The packing member 1 is provided with a washer 2 which has a through hole h through which a threaded reinforcing bar is inserted and which is attached along one side end surface 10 of the packing member 1.

The packing member 1 has an outer peripheral surface 11 on the opposite side of the side end surface 10.
From the side toward the center side where the insertion hole H is formed, the inclined surface 13 formed to have a gradually increasing thickness, and a vertical surface parallel to the side end surface 10 that connects the inclined surface 13 and the outer peripheral surface 11. 14 is formed in a cross-sectional shape. Then, on the center side where the insertion hole H is formed, the thick portion 1a protruding toward the partition wall
Is formed, and an annular thin portion 1b is formed on the outer peripheral surface 11 side.

The hardness of the elastic material constituting the packing member 1 is not particularly limited, but within the range of 30 to 60 ° in JIS A hardness, especially 4
It is preferably around 0 °. If the hardness of the packing member 1 exceeds 60 °, it is not possible to sufficiently follow the complicated unevenness of the threaded joint reinforcing bar, and conversely, if the hardness is less than 30 °, the followability is excellent, but water pressure is applied. At that time, it is likely to be deformed, and in any case, there is a possibility that a sufficient water blocking effect cannot be obtained.

On the other hand, the washer 2 is formed by bending the disk-shaped main body 20 in which the insertion hole h is formed in the central portion and the peripheral portion of the disk-shaped main body 20 in a direction parallel to the axis of the screw joint reinforcing bar. Was done,
An annular peripheral side wall surrounding the outer peripheral surface 11 of the packing member 1
It has 21 and.

The packing member 1 and the washer 2 have the main body 20 of the washer 2 along one side end surface 10 of the packing member 1 and the outer peripheral surface of the packing member 1 by the peripheral side wall 21 of the washer 2.
They are fixed to each other in a state of surrounding 11. For fixing the packing member 1 and the washer 2 to each other, an adhesive for baking is used to heat the packing member 1 and the washer 2 by heating when vulcanizing the rubber material forming the packing member 1. In addition to baking, so-called vulcanization adhesion (baking) is preferably performed, it is also possible to carry out adhesion with an ordinary adhesive. Further, the packing member 1 and the washer 2 may be fixed by simply press-fitting and fitting, but when the fitting is disengaged during turning, the separated parts are
The packing member 1 and the washer 2 are preferably adhered and fixed by baking, as described above, because the work needs to be moved because they must be moved on the threaded joint reinforcing bars.

The water blocking packing P, P of this embodiment, which includes the above-mentioned parts,
As shown in FIG. 2, the thickened portions 1a, 1a of the packing members 1, 1
The threaded rebar S through the insertion holes H, h, with the wall facing toward the partition F1, and then tighten the nuts N, N screwed to the threaded rebar S from behind the washer 2. When going, as shown in FIG. 3, the thick portions 1a, 1a enter between the thread-bar reinforcement S and the bulkhead F1 in a state of biting into the complicated unevenness of the surface of the thread-bar reinforcement S. With a relatively low torque tightening force (usually 4000 kg-cm or less), water can be reliably stopped between the two.

Further, in the waterproof packing P of this embodiment, the outer peripheral surface is
Since the vertical surface 14 whose inner thickness does not gradually increase is provided on the 11 side, the thin portion 1b is made thinner than in the case where the inclined surface 13 is formed starting from the tip of the peripheral side wall 21 of the washer 2. Since the meat escape to the outside of the packing member 1 at the time of the tightening can be mitigated and the peripheral side wall 21 formed on the washer 2 can surely prevent the meat escape, A reliable water stop can be performed.

The waterproof packing of the present invention is not limited to the above embodiments.

For example, in the packing member 1, as shown in FIG. 1 (b), the inclined surface 15 connecting the thick portion 1a on the center side and the thin portion 1b on the outer peripheral surface 11 side does not have a vertical surface and the inclined surface 15 It may be directly connected to the surface 11.

Further, in the packing member, the thick portion on the center side and the thin portion on the outer peripheral surface side may be connected by a step portion instead of the inclined surface.

In addition, various design changes can be made without changing the gist of the present invention.

<Effects of the Invention> The water-proof packing of the present invention is configured as described above, and in the state in which the packing member is directed toward the partition wall, the threaded section reinforcing bar is inserted into the insertion hole, and then from the back of the washer. When tightening the nut screwed to the threaded bar reinforcement, the peripheral side wall formed on the washer prevents the packing member from escaping to the outside and projects toward the partition wall of the packing member. The thick part on the center side digs into the complicated unevenness of the surface of the threaded joint reinforcing bar, enters between the threaded joint reinforcing bar and the partition wall, and water can be stopped between them. Therefore, the water blocking packing of the present invention can reliably stop the water between the partition wall and the threaded joint rebar by the tightening force of a relatively low torque, so that a large wrench that can be tightened with a high torque is used. This is suitable for stopping water between the partition wall and the threaded joint bar in the above-mentioned new construction method, which is difficult to do.

[Brief description of drawings]

1 (a) is a sectional view showing an embodiment of the water blocking packing of the present invention, FIG. 1 (b) is a sectional view showing a modified example of the water blocking packing of the present invention, and FIG. 2 is FIG. FIG. 3A is a cross-sectional view showing a state in which the water blocking packing of the embodiment of (a) is mounted on a threaded joint reinforcing bar, and FIG. 3 shows the water blocking packing is tightened with a nut to stop water between the threaded joint reinforcing bar and the partition wall. FIG. 4 is a cross-sectional view showing a state, FIG. 4 is a partially cutaway perspective view showing an example of a mold in which the water blocking packing of the present invention is used, and FIG. 5 is a positional relationship between a partition wall and a threaded bar in the above mold. FIG. 6 is a sectional view showing the positional relationship between the threaded joint bar, the partition wall and the nut when the water blocking packing is not used. 1 ... Packing member, 10 ... Side end surface, 11 ... Outer surface, 12 ... Inner surface, 13,15 ... Inclined surface, H ... Insertion hole, 1a ... Thick portion, 1b ... Thin portion Part, 2 ... washer, 20 ... main body, 21 ... peripheral side wall, h ... insertion hole, P ... waterproof packing.

Claims (1)

[Claims] 1. A water-proof packing that is interposed between a nut screwed to a threaded joint reinforcing bar and a partition wall through which the threaded joint reinforcing bar penetrates to stop water between the threaded joint reinforcing bar and the partition wall. The whole thing is made of elastic material made of rubber or plastic,
The center side has a circular insertion hole through which the threaded reinforcing bar is inserted, and at least the side end face facing the partition wall is formed to be gradually thicker so that the center side where the insertion hole is formed protrudes toward the partition wall. And a ring-shaped packing member that is formed, along with the side end surface facing the nut of the packing member, and has an insertion hole through which a threaded rebar is inserted in the central portion,
A water blocking packing comprising: a washer having an annular peripheral side wall surrounding the outer peripheral surface of the packing member in a peripheral portion.