JPH03169908A - Water stop device - Google Patents

Abstract

PURPOSE:To make easy and sure method for water stop available by making up a water stop device of an annular packing member whose center is formed to become gradually thicker as it approaches a partition wall, a washer having an annular peripheral wall, a spacer and a seal ring. CONSTITUTION:A water stop device A is made up of an annular packing member 1 made of elastic material, a washer 2 fixed to the member 1, a spacer 3 and a seal ring 4. A pair of the water stop devices are employed, holding a partition wall F1 from both sides. The spacers 3 of each of the devices are attached, through the seal rings 4, along the partition wall F1. The packing members 1 are held roughly coaxial with the spacers 3, with the thick parts of the members 1 placed facing the partition wall F1, and a screw-knotted reinforcement S is inserted through each of through holes H1, H2 and H3. Then nuts N are applied from the rear side of the washers 2 and are screwed down until the thick parts 1a are thrusted into the surface of the screw-knotted reinforcement S. Thereby water stop can be made by tightening with relatively low torque.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application Field The present invention relates to a water stop device used in a new construction method for constructing underwater structures such as bridge piers and vertical shafts for immersed tunnels.

Problems to be Solved by the Prior Art and the Invention Recently, as a method of constructing underwater structures such as the above-mentioned bridge piers and vertical shafts of submerged tunnels, as shown in FIG. Formwork F with a steel shell structure partitioned into B is manufactured on land and towed to the water at the construction site, then each compartment is filled with water and sunk to the bottom of the water at the construction site, and then the water in each compartment is A new construction method has been developed, in which concrete is poured one section at a time, and concrete is poured one section at a time, and plans are being made to implement it. In addition, the figure shows a formwork for constructing the vertical shaft of an immersed tunnel, and in the figure, reference numeral F2 indicates a partition wall for reinforcing the formwork, and F3 indicates a bottom plate.

In the above construction method, as shown in Fig. 6, a plurality of threaded reinforcing bars S buried between a plurality of sections B
As shown in FIG. By attaching it, it is fixed to the partition wall F1.

However, in the above structure, water is not sufficiently stopped between the partition wall F1 and the threaded reinforcing bars S, so water enters the drained section B from the adjacent undrained section B, and the pouring This may adversely affect the hardening time of concrete, the strength after hardening, or the threaded reinforcing bars S buried in this poured concrete.

Therefore, it is conceivable to interpose an annular sealing member such as an O-ring between the nut N and the partition wall F1. However, the inside of section B of formwork F is narrow, and it is difficult to use a large wrench or the like that can tighten the nut N with high torque, so there is a limit to the tightening torque of the sealing member. (Usually 4000kg-(7
)degree). For this reason, the sealing member cannot sufficiently follow the threaded joint reinforcing bar S, which has a complicated surface unevenness and is likely to be eccentric with respect to the through hole of the partition wall F1, and There is a problem in that it is not possible to reliably shut off water between the steel and the reinforcing steel.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a water stop device that can reliably stop water between a partition wall and a threaded reinforcing bar even with a relatively low tightening torque. It is said that

Means for Solving the Problems> In order to solve the above problems, the water stop device of the present invention has the following features:
The entire body is made of an elastic material such as rubber or plastic, and has a circular insertion hole on the center side into which the threaded reinforcing bar is inserted, and at least the center side of the end face on the partition wall side where the insertion hole is formed faces toward the partition wall. It has an annular packing member that is gradually thickened so as to protrude, and is placed along the side end surface of the packing member facing the nut, and has an insertion hole in the center through which the threaded reinforcing bar is inserted. , a washer having an annular circumferential side wall surrounding the outer circumferential surface of the packing member in its peripheral portion, and ■ interposed between the partition wall and the packing member;
It is characterized by being equipped with a spacer having an insertion hole in the center through which a threaded reinforcing bar is inserted, and (1) a seal ring that shuts off water between the spacer and the partition wall.

According to the water stop device of the present invention having the above configuration, the spacer is placed along the partition wall via the seal ring, the packing member is opposed to the spacer, and the insertion hole of the spacer and the packing member is When the threaded reinforcing bar is inserted through the threaded reinforcing bar, and the nut screwed onto the threaded reinforcing bar is tightened from behind the washer, the thick part of the center side of the Basokin member that protrudes toward the bulkhead will be inserted into the threaded bar. It bites into the complicated irregularities on the surface of the reinforcing bars, and also gets in between the threaded reinforcing bars and the spacer to stop water between them. Furthermore, during the tightening process, the circumferential wall formed on the washer prevents the packing member from escaping outward. Further, the seal ring is in close contact with the partition wall to shut off water between the spacer and the partition wall.

In particular, since the spacer and seal ring are interposed between the packing member and the bulkhead, even if the threaded reinforcing bar is largely eccentric with respect to the through hole of the bulkhead, the space between the bulkhead and the threaded reinforcing bar can be securely maintained. Water can be stopped.

Embodiments The water stop device of the present invention will be described below with reference to drawings showing embodiments.

FIG. 1 is a sectional view showing a water stop device A of the present invention.

This water stop device A includes an annular packing member 1 made entirely of an elastic material made of rubber or plastic, a washer 2 attached along one side edge 10 of the packing member 1, and a partition wall F1 (first 2) and the packing member 1, and the spacer 3 and the partition F1.
A seal ring 4 is provided to shut off water between.

The packing member 1 has an insertion hole H1 formed on the center side for inserting a threaded reinforcing bar S (see FIG. 2). The packing member 1 also has an inclined surface 13 formed on the opposite side of the side end surface 10 so as to gradually become thicker from the outer circumferential surface 11 side toward the insertion hole H1 side, and between this inclined surface 13 and the outer periphery. It is formed in a cross-sectional shape having a vertical plane 14 that is parallel to the side end surface 10 and connects the surface 11 . A thick wall portion 1a protruding toward the partition wall F1 is formed on the center side where the insertion hole H1 is formed, and an annular thin wall portion 1b is formed on the outer circumferential surface 11 side.

Although the hardness of the elastic material constituting the packing member 1 is not particularly limited, it is preferably within the range of 30 to 60@, particularly around 40@ in terms of JIS A hardness. If the hardness of the packing member 1 exceeds 60°, it will not be able to sufficiently follow the complex unevenness of the threaded reinforcing bar S. On the other hand, if the hardness is less than 306, although it has excellent followability, it will not be able to follow water pressure etc. In either case, there is a risk that a sufficient water-stopping effect may not be obtained.

On the other hand, the washer 2 includes a disc-shaped main body 20 in which an insertion hole H2 for inserting the threaded reinforcing bar S is formed in the center, and an axis of the threaded reinforcing bar S in the peripheral part of the disc-shaped main body 20. and an annular peripheral side wall 21 surrounding the outer peripheral surface 11 of the packing member 1, which is formed by bending and raising the packing member 1 in a direction parallel to the packing member 1.

The packing member 1 and the washer 2 are arranged such that the main body 20 of the washer 2 is aligned with one side end surface 10 of the packing member 1, and
The outer circumferential surface 1 of the packing member 1 is
They are fixed to each other in a state surrounding 1. Note that the above-mentioned packing member 1 and washer 2 are fixed by baking the packing member 1 and washer 2 by using a baking adhesive and heating when vulcanizing the rubber material that constitutes the packing member 1. Although so-called vulcanization adhesion (baking) is preferably carried out, adhesion using a normal adhesive can also be performed. Further, the packing member 1 and washer 2 may be fixed by simply press-fitting or fitting, but if this fitting comes undone during construction, the separated parts are placed on the threaded reinforcing bar. The packing member 1 and the washer 2 are preferably bonded and fixed by baking as described above, since the work is complicated.

The spacer 3 has an annular shape in which an insertion hole H3 for inserting the threaded reinforcing bar S is formed in the center, and both end surfaces 30
．． 31 are formed parallel to each other, and the partition walls F
1, an annular groove 32 is formed concentrically with the insertion hole H3, and a seal ring 4 is fitted into this crown groove 32.

In the case of the figure, the seal ring 4 is constituted by an O-ring, and its diameter is the same as that of the through hole H4 of the threaded reinforcing bar S of F1.
The diameter of the through hole H4 is set to be sufficiently large so that even if it is most eccentric to the partition wall F1, it is located outside the through hole H4 of the partition F1 (see Fig. 2).
.

The water stop device A of this embodiment, which is composed of the above-mentioned parts, is normally used one set at a time with the partition wall F1 in between, as shown in FIG. In this use, the spacer 3 is placed along the partition wall F1 via the seal ring 4, and the packing member 1 is placed approximately concentrically with the spacer 3 with the thick portion 1a of the packing member 1 facing toward the partition wall Fl. After holding the washer 2 and inserting the threaded reinforcing bar S into each of the insertion holes 81, H2, and H3, tighten the nut N screwed onto the threaded reinforcing bar S from behind the washer 2, as shown in FIG. As shown in FIG. 2, the thick portion 1a can be inserted between the threaded reinforcing bar S and the spacer 3 in a state where it bites into the complicated irregularities on the surface of the threaded reinforcing bar S. Therefore, water can be reliably sealed between the two with a relatively low tightening force (usually 4000 kg-(7) or less). Also,
At the same time as stopping the water between the threaded reinforcing bar S and the base plate 3,
By bringing the seal ring 4 into close contact with the partition wall F1, water can also be stopped between the spacer 3 and the partition wall F1.

In the above water stop device A, since the vertical plane 14 whose wall thickness does not gradually increase is provided on the outer circumferential surface 11 side, the inclined plane 1
3 starting from the most distal end of the circumferential wall 21 of the washer 2, the thin portion 1b can be made thinner, and the outward thickness of the packing member 1 during tightening can be reduced. The circumferential wall 21 formed on the washer 2 reduces the relief and
This reliably prevents the meat from escaping, so water can be stopped more reliably. Moreover, since water is stopped between the partition wall Fl and the spacer 3 by the seal ring 4 interposed between them, even if the threaded reinforcing bar S is largely eccentric with respect to the through hole H4 of the partition wall F1, The water stop can be reliably performed.

Note that the water stop device A of the present invention is not limited to the above embodiments. For example, in the packing member 1, as shown in FIG. It may be directly connected to 11.

Further, in the above-mentioned packing member, the thick portion 1a on the center side and the thin portion 1b on the outer peripheral side may be continuous in a stepped shape instead of an inclined surface. Furthermore, the volume of the thick portion 1a may be increased by making the center side of the side end surface 10 protrude toward the washer 2.

In addition, various design changes can be made, such as configuring the seal ring 4 with a ring with a rectangular cross section.

On the other hand, the partition wall to which this invention is applied may be any partition wall other than the partition wall F1 that partitions the inside of the formwork for concrete pouring.

Effects of the Invention> As described above, according to the water stop device of the present invention, the packing member stops water between the spacer and the threaded reinforcing bar, and the seal ring stops water between the partition wall and the spacer. Therefore, by simply tightening the nut screwed onto the threaded reinforcing bar with a relatively low torque, water can be reliably sealed between the partition wall and the threaded reinforcing bar. Therefore, it is suitable for stopping water between the partition wall and the threaded reinforcing bars in the above-mentioned new construction method in which it is difficult to use a large wrench or the like.

In particular, since a spacer and a seal ring are interposed between the packing member and the partition wall, water can be reliably stopped even when the threaded reinforcing bar is largely eccentric with respect to the insertion hole of the partition wall. can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the water stop device of the present invention, Fig. 2 is a sectional view showing the state where the water stop device is attached to a threaded reinforcing bar, and Fig. 3 is a sectional view showing the water stop device attached to a threaded reinforcing bar. A sectional view showing a state in which water is stopped between a threaded reinforcing bar and a partition wall by tightening, FIG. 4 is a sectional view showing another embodiment, and FIG. 5 is a model in which the water stopping device of the present invention is used. A partially cutaway perspective view showing an example of the frame, Figure 6 is a perspective view of the main part showing the bulkhead and threaded reinforcing bars in the formwork, and Figure 7 shows the threaded reinforcing bars and bulkhead when no water stop device is used. A sectional view showing a nut. 1... Packing member, 10... Side end surface, H1 to H3
...Insertion hole, 1a...Thick part, 2...Washer, 2
]... Circumferential wall, 3... Spacer, 4... Seal ring, F1... Partition wall, S... Threaded joint reinforcement, A...
Water stop device.

Claims (1)

[Scope of Claims] 1. A stopper that is interposed between a nut screwed onto a threaded reinforcing bar and a partition wall through which the threaded reinforcing bar is penetrated to stop water between the threaded reinforcing bar and the partition wall. The water device is entirely made of an elastic material such as rubber or plastic, and has an insertion hole on the center side through which the threaded reinforcing bar is inserted, and at least the center side of the end face on the partition wall side, where the insertion hole is formed, An annular packing member formed to gradually increase in thickness so as to protrude toward the partition wall, and an insertion hole extending along the side end surface of the packing member facing the nut and into which a threaded reinforcing bar is inserted in the center. a washer having an annular circumferential side wall surrounding the outer circumferential surface of the packing member at its periphery, and a spacer interposed between the partition wall and the packing member and having an insertion hole in the center through which a threaded reinforcing bar is inserted. A water stop device comprising: and a seal ring that stops water between the spacer and the partition wall.