JPH06117195A - Method for testing watertightness of watertight sheet-connecting device and connecting device used therefor - Google Patents

Abstract

PURPOSE:To simply determine whether or not both members for engagement are watertightly fitted to each other. CONSTITUTION:One end of cavities C, which are formed between an inner surface 5f on a female member 5 to be engaged and a head part 4f on a male member 4 for engaging after the members 4, 5 are fitted to each other, is shut and the other end is filled with a compressed gas. If there are some clearances on close contact parts B, B' between the members 4, 5, the compressed gas leaks out therethrough and the pressure thereof lowers gradually. If there are no clearances thereon, the pressure is kept constant, and hence whether the clearances exist or not can be easily confirmed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water density inspection method for a waterproof sheet connecting device used for tunnel construction or waterproofing of concrete structures, and a connecting device used for the method.

[0002]

2. Description of the Related Art For example, in tunnel construction, in order to prevent the underground spring water from invading from the primary concrete side sprayed on the inner surface of the tunnel to the secondary concrete side placed on the inner surface, It is known that a water blocking sheet is stretched on the surface of primary concrete before placing concrete.

Since the length of the waterproof sheet is finite, the side edges of the waterproof sheet must be stretched while being watertightly connected to each other as the tunnel is advanced. As a conventional connecting means for watertightly connecting the side edges of such a waterproof sheet, for example, a male engaging member as shown in FIGS. 4 and 5 is used.
There is a coupling device (A) consisting of (4) and a female engagement member (5).

In FIG. 4, (1) is a flexible waterproof sheet made of plastic, and the front and back surfaces excluding the side edge portions thereof have a concave portion (2) and a convex portion along a direction intersecting with each other. Department
(3) and (3) are continuously provided so as to be located close to each other.

At one side edge of the water blocking sheet (1), two pairs of large and small elastic tongues extending from both the tip and the middle of the plate-shaped head (4a) toward both sides are formed. A male engagement member (4) including pieces (4b) (4c) is provided.

The male type engaging member (4) has a bifurcated branch at the base end of the head (4a), and one piece of the connecting piece (4d) is one side edge of the waterproof sheet (1). The other piece is a knob piece (4e) used when fitting the male engagement member (4) to the female engagement member (5).

The other side edge of the water blocking sheet (1) has a non-recessed area larger than the one side edge, and that portion is a nail stopper.
(6), and the female engaging member (5) is attached to the base of the nailing piece (6).
Is provided.

The female engaging member (5) has a substantially trapezoidal cross section, and the head portion (4a) of the male engaging member (4) is fitted in the center of the base of the trapezoid. Aperture (5
a) The fitting part (5b) provided with the base of this fitting part (5b)
It is composed of a connecting piece (5c) and a knob piece (5d) which are bifurcated from (the upper side of the trapezoid).

When the male engaging member (4) is fitted to the inner surface (5f) of the female engaging member (5), the female engaging member (5) is
It is interposed between two pairs of elastic tongues (4b) and (4c) of (4), and the elastic tongue (4b) near the tip of the head (4a) is pressed to further improve the water tightness. A pair of elastic tongues (5e) are formed.

The opening (5) of the fitting portion (5b) of the female engaging member (5)
The vicinity of a) is largely bent toward the inner side of the inner surface (5f) and slightly inclined, and after the male and female engagement members (4) and (5) are press-fitted,
The elastic tongue (4c) engages with this inclined portion so that the male engaging member (4) is more reliably prevented from coming off.

The connecting piece (5c) is fixed to the base of the nail stopping piece (6) in the water blocking sheet (1), and the knob piece (5d) performs the same function as the knob piece (4e).

To use this waterproof sheet (1) for tunnel construction, nail the nail piece (6) with a nail (7) to the primary spray concrete (not shown) to stop the waterproof sheet (1).
Next, the male engaging member (4) of the water blocking sheet (1) stretched as shown in FIG. 5 is then press-fitted onto the female engaging member (5), and then on the opposite side. The waterproof sheet (1) is stretched in order by nailing the nail stopper pieces (6).

That is, when the coupling device (A) of the water blocking sheet (1) is coupled, the female type engaging member (5) is connected to the male type engaging member.
(4) is press-fitted, and the elastic tongue in the male engaging member (4)
(4b) A close contact portion (B) is formed by the tips of (4c) and the inner surface (5f) of the female engaging member (5), and the female engaging member (5) is further formed.
Of the elastic tongue (5e) provided on the inner surface (5f) of the head and the head (4a) of the male engaging member (4), thereby forming another pair of close contact parts (B ').
Is formed, and the sealing property is secured.

[0014]

SUMMARY OF THE INVENTION In the conventional water-stop sheet connecting device (A) described above, the male engaging member (4) and the female engaging member (5) are simply press-fitted. By close part (B)
(B ') is formed, and the water tightness is maintained by the close contact portions (B) and (B').

However, for example, when the press-fitting work is incomplete, a part of the coupling device (A) abuts on the projection of the primary shotcrete, the head of the anchor bolt (not shown) and other projections. When some of the engaging members (4) and (5) are deformed, a gap may be formed in the close contact portions (B) and (B '). If there is a gap in the close contact parts (B) and (B '), spring water may enter from there.

Since there is no conventional method for confirming whether or not there is a gap between the close contact portions (B) and (B ') in a state in which both the engaging members (4) and (5) are press-fitted as described above. However, there was a possibility that the subsequent construction would be continued with a gap and that the adverse effect of spring water would occur after the construction.

The present invention has been made in order to solve the above problems, and it is possible to easily confirm whether or not there is a gap in a close contact portion formed by fitting of both engaging members. An object of the present invention is to provide a water density inspection method for a sheet binding device and a binding device that can be used for the method.

[0018]

In order to achieve the above object, the method for inspecting the water density of a waterproof sheet joining apparatus according to the present invention comprises:
After press-fitting a head-shaped male engaging member provided on one of the opposite side edges of two water blocking sheets adjacent to each other to a female engaging member provided on the other side edge, By closing one end of the space formed between the inner surface of the female engagement member and the head of the male engagement member and introducing compressed gas from the other end of the space, both It is characterized in that the water density of the close contact portion formed by fitting of the engaging members is inspected.

Further, the coupling device used for this is a head-shaped male engaging member provided on one of opposite side edges of two water blocking sheets adjacent to each other, and provided on the other opposite side edge. And a female engagement member that engages with the male engagement member, and a base portion of the female engagement member and a tip portion of the head portion of the male engagement member. At least one
Along the respective longitudinal directions, both ends are open, and the space is formed by communicating with the void formed by the head of the male engaging member and the inner surface of the female engaging member. It is characterized by forming a part of the introduction hole.

[0020]

After fitting both engaging members, one end of the void formed between the inner surface of the female engaging member and the head of the male engaging member is closed, and When compressed gas is introduced into the space from the other end, if there is a gap in the close contact parts of both engaging members, the compressed gas leaks from there and the pressure of the compressed gas gradually decreases,
If there is no gap, the pressure of the compressed gas is kept constant, so it is possible to easily confirm whether there is a gap.

[0021]

1 and 2 show an example of a coupling device (A ') for a waterproof sheet (1) used directly for carrying out the method of the present invention. The coupling device (A ') has the same configuration as the above-described conventional example except for the following points, and the same reference numerals are given to the same constituent members as those in the conventional example for detailed description. Is omitted.

In the coupling device (A '), the waterproof sheet
(1) The base portion (5) of the female engaging member (5) that is continuously provided on one side edge
An introduction hole (5h) having a circular cross section for introducing compressed gas is formed near the inner surface (5f) of g) along the longitudinal direction of the female engagement member (5).

The introduction hole (5h) has an inner surface through the slit (5i).
(5f), the engaging member is substantially in the engaging member (5)
The inner surface (5) of the engaging member (5) when the head (4a) of (4) is press-fitted
It forms a part of a space (C) formed between the f) and the head portion 4a of the engaging member 4. Incidentally, the slit (5i), the compressed gas injected into the introduction hole (5h) can flow to the inner surface (5f) side through the slit (5i), but will be described later injected into the inner surface (5f) side. Such a viscous sealing material (8) (see FIG. 2) is made minute so as not to flow into the introduction hole (5h) side through the slit (5i), or a mere cut, or A lip check valve is preferable. Both ends of the introduction hole (5h) are open to the end surface of the engaging member (5).

Next, one embodiment of the water density inspection method of the present invention using this coupling device (A ') will be described. As shown in FIG. 1, a headed male engaging member (4) provided on one of the opposing side edges of two water blocking sheets (1) adjacent to each other is provided on the other side edge. After being press-fitted into the female type engaging member (5), as shown in FIG. 2, the engaging member which is a part of the empty space (C) from one end of the empty space (C) as required. Head of (4) (4a)
The outer surface of the elastic tongue (4b) near the tip of the
A low-viscosity butyl rubber or other viscous sealing material (8) is injected between the elastic tongue (5e) and the inner surface (5f) on the inner side.

The injection of the viscous sealing material (8) is carried out by a coupling device.
It is intended to improve the water tightness of (A ') and is not essential as a method for inspecting the water density. The viscous sealing material (8) is attached to the engaging members (4) and (5) before press fitting.
Either one or both of the outer surface of the head (4a) of (4) and the inner surface (5f) of the engaging member (5) are pre-coated and each engaging member
You may leave it as a part of (4).

Next, both engaging members (4) and (5) fitted to each other
At one end of the space (C) (including the introduction hole (5h)) that opens at the end of the space (C), for example, a rubber plug (not shown) is press-fitted to hermetically close the space (C) from the other end. , Compressed air or other compressed gas (compressed air in the following description) is introduced into the space (C).

More specifically, among the other ends of the void (C),
The tip of an air hose (not shown) connected to a compressed air source (not shown) is closed at the opening of the introduction hole (5h) except for the opening of the introduction hole (5h) by the same means as the above rubber stopper. And pressurize to introduce compressed air into the introduction hole (5h). Air hose
An on-off valve and a pressure gauge (both not shown) are preferably provided.

The compressed air introduced into the introduction hole (5h) passes through the slit (5i) and enters the inner surface (5f) side of the void (C), and in the unlikely event that it comes into close contact (B) (B '). If there is a gap in the compressed air, the compressed air leaks out of both engaging members (4) and (5) through the gap, and if there is no such gap, it is introduced into the introduction hole (5h). The pressure of the compressed air gradually increases.

Therefore, for example, even if it is only confirmed whether the pointer of the pressure gauge provided on the air hose reaches a pressure value substantially equal to the pressure of the compressed air source within an appropriate time, it is determined whether or not a gap is formed. It can be easily determined.

In order to make an accurate determination, in the same manner as above, after introducing compressed air into the introduction hole (5h) until the required pressure is reached, the on-off valve provided in the air hose is closed and then It is preferable to confirm whether the reading of the pointer of the pressure gauge decreases within a predetermined time. In this case, it can be seen that a gap is generated if the height decreases.

Further, in place of the pressure gauge, a flow meter is provided in the air hose, and it is confirmed whether or not there is a gap depending on whether or not the reading of the flow meter becomes 0 within a fixed time. A colored gas is used as the compressed gas, and whether or not there is a gap depending on whether or not the colored gas is ejected from any part of the fitting parts of both engaging members (4) and (5). You may check.

If it is found that there is a gap, the leaking portion of the compressed air is searched for by a leaking sound or contact and the portion is re-fitted, or other necessary measures are taken. . In this case, it is convenient to use a colored gas as the compressed gas because it is possible to immediately identify the portion where the gap is formed.

FIG. 3 shows a modification of the male engaging member (4) of the coupling device (A ') used directly for carrying out the method of the present invention, the head of this engaging member (4). The tip end surface of the portion (4a) is provided with a concave strip-shaped introduction hole (9) for introducing compressed air which forms a part of the space (C). The other configurations are the same as those shown in FIG. 1, and the same reference numerals are shown in the drawings, and detailed description will be omitted.

This engaging member (4) is the same as the engaging member (5) shown in FIGS. 1 and 2, or an introducing hole (5h) and a slit (5i) are formed from the engaging member (5). Mating with the omitted one,
If carried out in the same manner as described above, the same operation and effect as described above can be obtained. In this case, the tip of the air hose
It is preferable that the compressed air is introduced into the space (C) by fitting it into one end of the introduction hole (9).

[0035]

(A) According to the inspection method of the present invention, when air is introduced into the void formed by the inner surface of the female engaging member and the head of the male engaging member, the close contact portion If there is a gap in the air, it is easy to see that air leaks from this gap and the two engaging members are not watertightly fitted.

(B) If the introduction hole for introducing compressed gas is provided in either one of the two engaging members as in the coupling device of the present invention, the introduction of air becomes easy and the inspection can be performed quickly. At the same time, it is possible to prevent clogging of vacant spaces and improve the accuracy of inspection.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a water-stop sheet joining device of the present invention after fitting.

FIG. 2 is a cross-sectional view showing a state in which a viscous seal material is press-fitted after the fitting.

FIG. 3 is a cross-sectional view showing a modified example of the male engaging member of the coupling device of the present invention.

FIG. 4 is a cross-sectional view showing a conventional water blocking sheet and a connecting device therefor.

FIG. 5 is a cross-sectional view of a conventional water blocking sheet coupling device before fitting.

[Explanation of symbols]

(1) Water stop sheet (2) Recessed portion (3) Convex portion (4) Male type engagement member (4a) Head portion (4b) (4c) Elastic tongue piece (4d) Connecting piece (4e) Knob piece (4f ) Head (5) Female engaging member (5a) Opening (5b) Fitting part (5c) Connecting piece (5d) Knob piece (5f) Inner surface (5g) Base (5h) Introducing hole (5i) Slit ( 6) Nail stopper (7) Nail (8) Butyl rubber (viscous sealing material) (9) Introductory hole (A) (A ') Coupling device (B) (B') Close part (C) Vacancy

Claims (5)

[Claims] 1. A head-shaped male engaging member provided on one of opposite side edges of two water blocking sheets adjacent to each other is replaced with a female engaging member provided on the other side edge. After press fitting, one end of the space formed between the inner surface of the female engagement member and the head of the male engagement member is closed, and compressed gas is introduced from the other end of the space. By doing so, the water density inspection method of the water blocking sheet joining device is characterized in that the water density of the close contact portion formed by fitting of both engagement members is inspected. 2. A viscous sealing material is injected into a part of the void after the male engagement member and the female engagement member are press-fitted to each other and before the compressed gas is introduced into the void. The method for inspecting water density of a waterproof sheet joining device according to claim 1. 3. The method for inspecting water density of a water blocking sheet binding apparatus according to claim 1, wherein the compressed gas is a colored gas. 4. A head-shaped male engaging member provided on one of opposite side edges of two water blocking sheets adjacent to each other, and the male die provided on the other opposite side edge. A female engaging member that engages with the engaging member of, at least one of the base of the female engaging member and the tip of the head of the male engaging member, Along the respective longitudinal directions, both ends are open, and the space is formed by communicating with the void formed by the head of the male engaging member and the inner surface of the female engaging member. A water-stop sheet coupling device having a part of an introduction hole. 5. The viscous sealing material is applied to at least one of the head of the male engaging member and the inner surface of the female engaging member. Water-stop sheet binding device.