JP3712602B2 - Joint pipe water blocking structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint pipe water stop structure, about the water stop structure of the pipe-shaped joint pipe to be used for particular connecting steel sheet pile.
[0002]
[Prior art]
For example, a steel pipe sheet pile foundation that is often used for large-scale foundations such as bridge foundations, for example, as shown in FIG. 7, while connecting joints of adjacent steel pipe sheet piles 50 to each other, It is constructed by placing it in the ground so as to have a closed shape such as an oval shape or a rectangle, and constructing the top concrete 51 in the internal space of this closed shape.
[0003]
Conventionally, as a joint of a steel pipe sheet pile foundation, a PP type (pipe type) as shown in FIG. 8 is generally used. This PP joint includes a joint structure of a steel pipe sheet pile 50 in which a small-diameter circular steel pipe (hereinafter referred to as a joint pipe) 53 in which slits 53a are formed along the pipe axis direction is attached to the side surface of the steel pipe sheet pile 50. Then, in the construction of the steel pipe sheet pile, the steel pipe sheet pile 50 is sequentially fitted into the slit 53a of the joint pipe 53 of the adjacent steel pipe sheet pile 50 so that the steel pipe sheet pile 50 sequentially defines a predetermined shape of the internal space. Then, the earth and sand in the joint pipe 53 is excavated and discharged, the inside of the joint pipe 53 is cleaned, the mortar 54 is filled in the joint pipe, and the steel pipe sheet pile 50 is connected.
[0004]
[Problems to be solved by the invention]
By the way, as shown in FIG. 7, steel pipe sheet piles are often used for the purpose of deadlines in rivers and harbors, so it is necessary to consider the water level difference between the water level _{Win in the} joint pipe and the surrounding water level _Wout. is there. Figure 9 is a partially enlarged view schematically illustrating the relationship between water level W _in in the peripheral water level W _out the joint tube 53 of steel sheet pile 50 which is connected through a joint pipe 53. As shown in the figure, at the time of connecting work of the steel pipe sheet pile 50, the water level W _in in the peripheral water level W _out the joint tube 53 of steel sheet piles 50 are the same level, moving the water around and within the joint pipe 53 In this case, the hydrostatic state is maintained.
[0005]
It is known that when the joint pipe 53 is cleaned from this state, movement occurs between the water in the joint pipe 53 and the water around the steel pipe sheet pile 50. That is, normal cleaning of the joint pipe 53 is performed by cutting the earth and sand in the joint pipe 53 with high-pressure jet water and discharging the cut earth and sand together with the muddy water in the joint pipe 53 by air transportation. At this time, since the water level Win _{in the} joint pipe decreases due to fluid transportation, muddy water supplied from a plant (not shown) is supplied from the upper part of the joint pipe 53 to stabilize the water level. However, as shown in FIG. 10 (a), when to hold the joint pipe water level W _in higher than the surrounding water level W _out, because of its water level difference [Delta] H, and the other joint tubes 53 of the slit 53a of the joint pipe 53 The muddy water in the joint pipe 53 may flow out from the gap 53a as indicated by the arrow A. Since the muddy water in this joint pipe 53 contains cutting earth and sand, if it flows out, it will lead to environmental pollution of the nearby water area.
[0006]
On the other hand, as shown in FIG. 10 (b), if the joint pipe water level W _in is kept lower than the peripheral level W _out, so that water around the steel pipe sheet pile is indicated by the arrow B, and the joint pipe 53 Will flow in. Further, the water level difference ΔH also affects the position below the joint pipe 53. That is, when the ground 55 such as the seabed or the riverbed is soft, soft soil and sand may flow into the joint pipe as indicated by the arrow C as water flows into the joint pipe 53.
[0007]
Thus, even if the inside of the joint pipe is cleaned in a state in which earth and sand flows from the slit of the joint pipe, it is difficult to surely clean the inside of the joint pipe. As a result, the mortar filled in the joint pipe There is a problem that the adhesion between the filler and the joint pipe cannot be sufficiently obtained, and the joint strength cannot be secured.
[0008]
Therefore, the object of the present invention is to eliminate the problems of the conventional techniques described above, and to provide a water stop means in the slit portion of the joint pipe, and to keep the water level in the joint pipe higher than the surrounding water level, so that It is intended to provide a joint pipe water-stopping structure and a joint pipe cleaning method that prevent the inflow of the joint pipe, reliably clean the joint pipe, and allow the joint to exhibit high strength.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a pair of circular steel pipes that are attached to the opposite side of the outer surface of a steel pipe sheet pile along the pipe axis direction of the steel pipe sheet pile and that have slits formed in the pipe axis direction. A joint pipe waterproofing structure for a joint pipe, wherein a part of the joint pipe is fitted to each other through the slit, and a fixed hardware that closes a gap generated along the slit when the steel pipe sheet pile is connected. The fixed water stop plate is attached to a guide rail attached to the outer surface in the vicinity of the slit along the tube axis direction of the joint pipe by engaging the fixed hardware, and a part of the water stop plate is It is provided so that the surface of the other joint pipe fitted by the said slit may be pressed and contacted.
[0010]
It is a joint water-stopping structure of a pair of joint pipes made of circular steel pipes attached to the opposite side of the outer surface of the steel pipe sheet pile along the pipe axis direction of the steel pipe sheet pile and having slits formed in the pipe axis direction. A water stop plate for closing a gap generated along the slit when a part of the joint pipe is fitted to each other through the slit and the steel pipe sheet pile is connected, and the outer surface of the joint pipe at the slit end and It is attached to the inner surface, and a part thereof is provided so as to press and abut the surface of the other joint pipe fitted with the slit.
[0011]
It is a joint water-stopping structure of a pair of joint pipes made of circular steel pipes attached to the opposite side of the outer surface of the steel pipe sheet pile along the pipe axis direction of the steel pipe sheet pile and having slits formed in the pipe axis direction. A water stop plate for closing a gap generated along the slit when a part of the joint pipe is fitted to each other through the slit and the steel pipe sheet pile is connected, and the outer surface of the joint pipe at the slit end and A curable filler is filled in a closed space attached to the inner surface and surrounded by the water stop plate and the surface of the other joint pipe fitted by the slit .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, several embodiments regarding the joint pipe water stop structure of the present invention will be described with reference to the accompanying drawings.
[First embodiment: Outer water stop structure] Reference examples (FIGS. 1 to 3) and an example (FIG. 4) of an outer water stop structure will be described with reference to FIGS. FIG. 1 is a perspective view partially showing a joint pipe in a fitted state to which an outer water stop structure is attached, FIG. 2 is an end view of the joint pipe portion of FIG. 1 viewed from above, and FIG. It is the enlarged view which showed the attachment state of the structure. Reference Example outside Gawatomesui structure 10 shown in FIG. 1, a gap 3 at two positions occurring in the slit portion 2a extending in the tube axis direction of the joint pipe 2 in a state where the steel pipe sheet piles 1 are connected, It consists of the structure which stops water with the water stop board 11 attached from the outer side of a pipe | tube (refer FIG. 2). This water stop plate 11 is attached in advance to a predetermined position of the joint pipe 2 before the steel pipe sheet pile 1 is placed, and at the same time when the joint pipe 2 is fitted in the slit 2a as the steel pipe sheet pile 1 is placed. The water stop of the joint pipe 2 can be achieved.
[0014]
In the present embodiment, in the joint structure of the steel pipe sheet pile 1, a steel pipe having an outer diameter of φ267.4 mm and a wall thickness of 12 mm is used as the joint pipe 2, and the slit 2 a formed in the pipe axis direction of the joint pipe 2. The steel pipe sheet pile 1 is connected in such a manner that a part of the other joint pipe 2 is fitted to the other. At that time, as shown in FIG. 2, a gap 3 of about 10 mm is generated in the slit 2a into which the joint pipe 2 is fitted. In order to close the gap 3, an elongated synthetic rubber water stop plate 11 as shown in an enlarged view in FIG. 3 is fixed to the slit end 2 b of the joint pipe 2 with a fixing bolt 13 via a holding plate 12. Yes. A synthetic rubber plate having a thickness of 5 to 10 mm is used for the water stop plate 11. However, the water stop plate 11 has sufficient rigidity so as to securely adhere to the outer surface of the other joint pipe 2 in the fitted state. It has become. As the synthetic rubber, chloroprene rubber, butyl rubber and the like are suitable.
[0015]
The total length of the water stop plate 11, as shown in FIG. 1, above the joint pipe water level W _in the upper end is planned, the lower end seabed (riverbed) by a predetermined embedment length D min in the ground 5 from surface It is set to be buried. The penetration length D varies depending on the soil condition, but is preferably about 1.5 times or more the expected water level difference ΔH.
[0016]
Next, an example of a retrofitting water stop structure as an example of the outer water stop structure 10 will be described with reference to FIGS. In this water stop structure, as shown in FIG. 4A, a guide rail 15 using CT steel or the like is attached to the outer surface end 2c in the vicinity of the slit of the joint pipe 2 along the pipe axis direction, After the placement of the steel pipe sheet pile 1 is completed, a water stop member 16 having a water stop plate 11 is attached to the guide rail. As shown in FIG. 4 (b), the water stop member 16 is provided with a slit 17 a on one side, and has a rectangular C-shaped cross section fixed metal 17 having a hollow portion 17 b with which the flange 15 a of the guide rail 15 can be engaged. And a synthetic rubber water stop plate 11 screwed to the fixed hardware 17 with a fixing bolt 13 via a holding plate 12. Although only the upper end surface of the water stop member 16 is shown in FIG. 4, the total length in the tube axis direction is preferably the same length as the water stop structure 10 shown in FIG.
[0017]
[Second embodiment: Both-side water stop structure]
5 and 6 are explanatory views showing an example of a double-side water stop structure having water stop plates on both surfaces of the slit side end of the joint pipe as another embodiment.
In the both-side water stop structure 20 shown in FIG. 5, two water stop plates 21 and 22 are attached so as to sandwich the joint pipe 2 from both sides. Among these, the inner water stop plate 21 is subjected to the muddy water pressure filled in the joint pipe, and a part 21a of the water stop plate 21 is pressed against and comes into contact with the outer surface of the other joint pipe 2. Degree is obtained.
[0018]
Each figure of FIG. 6 is the end view and sectional drawing which showed the structure of the both-side water stop structure 20. As shown in FIG. As shown in FIG. 6 (a), a fixed metal 23 having a U-shape in a plan view is locked to the slit side end 2 b of the joint pipe 2. The recesses 23a of the fixed hardware 23 are set to be approximately equal to the thickness of the joint pipe 2, and the synthetic rubber water stop plates 21 and 22 are attached to both side surfaces of the fixed metal 23 by the fixing bolts 25 via the pressing plates 24. Is attached. The inner water blocking plate 21 is bent at an acute angle as a whole, and a part 21 a thereof is in contact with the outer peripheral surface of another joint pipe 2. The outer water stop plate 22 curves slightly outward, and the tip portion 22 a abuts against the outer surface of the other joint pipe 2. As shown in FIG. 6 (b), the fixed hardware 23 is fixed to the joint pipe 2 by through bolts 26 that are provided at predetermined intervals in the pipe axis direction and penetrate the joint pipe.
[0019]
Moreover, in this both-side water stop structure 20, it fills with the sclerosing | hardenable filler 30 (mortar, chemical | medical solution solidification material, etc.) in the closed space part which makes | forms substantially triangular shape by planar view pinched | interposed between the two water stop plates. Is also preferable. FIG. 6B shows a state in which the curable filler 30 is filled in the closed space 6. The watertightness of the joint portion can be reliably improved by closing the closed space 6 while maintaining watertightness. Moreover, since the slit side end of the joint pipe can be fixed, the joint pipe 2 can be prevented from being deformed near the slit.
[0020]
In addition, the muddy water circulated in the joint pipe 2 for fluid transport of the earth and sand cut in the joint pipe 2 is used as a stable liquid such as bentonite liquid used when creating a groove wall such as a continuous underground wall. Managed muddy water is preferred. In the case of a natural ground with a low risk of collapse such as a self-supporting ground, normal water can be used for cleaning the inside of the joint pipe.
[0021]
【The invention's effect】
Since it has a water stop structure that maintains the water level in the joint pipe of the steel pipe sheet pile, it is possible to reliably clean the inside of the joint pipe pipe, thereby ensuring the joint strength obtained by the filler. Play.
[Brief description of the drawings]
FIG. 1 is a partial perspective view showing one embodiment of a joint pipe water blocking structure of the present invention.
2 is an end view showing the joint pipe water blocking structure of FIG. 1 along the line II-II.
FIG. 3 is an enlarged view of the joint pipe water stop structure shown in FIG. 2;
FIG. 4 is an enlarged view showing a modified example of the outer water stop structure.
FIG. 5 is a partial perspective view showing another embodiment of the joint pipe water blocking structure.
6 is an enlarged view showing the joint pipe water blocking structure and the mounting state of FIG. 5;
FIG. 7 is a perspective view showing an example of a conventional steel pipe sheet pile foundation, excluding some steel pipe sheet piles.
FIG. 8 is an end view showing an example of a joint structure of a conventional steel pipe sheet pile.
FIG. 9 is an explanatory view schematically showing the periphery of a conventional steel pipe sheet pile and the water level in the joint pipe (at the time of still water).
FIG. 10 is an explanatory view schematically showing the surroundings of a conventional steel pipe sheet pile and the water level state in the joint pipe (at the time of high water level in the joint pipe and at the high level of the surrounding water level).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel pipe sheet pile 2 Joint pipe 2a Slit 3 Crevice 10 Outer water stop structure 11, 21, 22 Water stop plate 13 Fixing bolt 15 Guide rail 16 Water stop member 17, 23 Fixing hardware 20 Both sides water stop structure 30 Curing filler

Claims (3)

  It is a joint water-stopping structure of a pair of joint pipes made of circular steel pipes attached to the opposite side of the outer surface of the steel pipe sheet pile along the pipe axis direction of the steel pipe sheet pile and having slits formed in the pipe axis direction. The water stop plate to which a part of the joint pipe is fitted to each other through the slit and a fixing hardware for closing a gap generated along the slit when the steel pipe sheet pile is connected is fixed in the vicinity of the slit. Of the other joint pipe, which is attached to the guide rail attached to the outer surface of the joint pipe along the tube axis direction of the joint pipe by engaging with the fixed hardware, and a part of the water stop plate is fitted in the slit. A joint pipe water-stop structure provided to press and abut the surface.   It is a joint water-stopping structure of a pair of joint pipes made of circular steel pipes attached to the opposite side of the outer surface of the steel pipe sheet pile along the pipe axis direction of the steel pipe sheet pile and having slits formed in the pipe axis direction. A water stop plate for closing a gap formed along the slit when a part of the joint pipe is fitted to each other through the slit and the steel pipe sheet pile is connected, and the outer surface of the joint pipe at the slit end and A joint pipe water stop structure, which is attached to an inner surface and is provided so as to press and abut the surface of the other joint pipe fitted with the slit.   It is a joint water-stopping structure of a pair of joint pipes made of circular steel pipes attached to the opposite side of the outer surface of the steel pipe sheet pile along the pipe axis direction of the steel pipe sheet pile and having slits formed in the pipe axis direction. A water stop plate for closing a gap generated along the slit when a part of the joint pipe is fitted to each other through the slit and the steel pipe sheet pile is connected, and the outer surface of the joint pipe at the slit end and A joint pipe waterproof structure characterized in that a curable filler is filled in a closed space which is attached to an inner surface and surrounded by the water stop plate and the surface of the other joint pipe fitted by the slit.

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