JPH08193339A - Water bottom tunnel and cut-off of water structure for extrusion shaft - Google Patents

Abstract

PURPOSE: To make it possible to satisfy both requirements covering the maintenance of a cut-off of water ability and the movability of a tunnel at the same time. CONSTITUTION: A plurality of seal flanges 25 are installed on an inner peripheral surface of an opening 23 of a shaft 20 with a specified spacing. The free end of each seal flange 25 is elastically connected to a water bottom tunnel 10 where a high viscosity fluid 29 is injected into a cell formed between the seal flanges 25. Expansion seal materials 24 and 40, which are capable of controlling expansion and contraction by feeding or discharging the fluid, are mounted on the outer most part of the seal flanges 25 and the inner peripheral surface of the outer most side opening 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stop structure for a water bottom tunnel and an extrusion shaft for constructing a tunnel skeleton in a vertical shaft on the land side and sequentially pushing it toward the water bottom to construct a water bottom tunnel.

[0002]

2. Description of the Related Art As shown in FIG. 4, a bearing a is installed in advance on a route, and a tunnel frame b is pushed from the land on the bearing a to construct a water bottom tunnel c.
It is disclosed in Japanese Laid-Open Patent Publication No. 0-1478. Compared with the conventional submersion method, this construction method has an advantage that not only the production yard equipment is not necessary at a place different from the submerged point, but also the steps of towing and submerging can be omitted.

[0003]

In the construction method of the underwater tunnel described above, since the underwater tunnel c is pushed to the water bottom through the sloped road d with a gradual slope, the production yard on the land side and the sloped road d are included. As a result, the extrusion range becomes longer.
In the construction method of a water-bottomed tunnel, a shaft for dry dogs is constructed on the bay, and a tunnel frame is constructed inside the shaft, and a method of pushing it out to the bottom of the water is also being developed. Assuming a construction method for starting a submerged tunnel from inside the shaft, it is necessary to develop a suitable waterproof structure between the opening of the shaft and the outer surface of the submerged tunnel that penetrates this opening. That is, there is a technical problem that the mobility of the tunnel is impaired if the water pressure is prioritized by increasing the pressure force of the sealing material in the penetration portion, and the water mobility is easily impaired if the mobility of the tunnel is prioritized. Has been clarified, and proposals for improved techniques are desired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a submerged tunnel and an extrusion type which can simultaneously satisfy both requirements of securing water shutoff and mobility of the tunnel. It is to provide water stoppage technology for vertical shafts.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an opening for inserting a water-bottom tunnel is formed in the front surface of the shaft, and the water-bottom tunnel for stopping the water by inserting the water-bottom tunnel into the opening to stop the vertical shaft for extrusion. In the water structure, a plurality of seal brushes are installed at a predetermined interval on the inner peripheral surface of the opening of the vertical shaft, and the free ends of the seal brushes are elastically contacted with the water bottom tunnel, and the image is drawn between the water bottom tunnel and the seal brush. It is a water stop structure of a water bottom tunnel and a vertical shaft for extrusion, which is characterized by injecting a highly viscous fluid into the formed compartment. The present invention forms an opening for inserting a water-bottom tunnel in the front surface of the shaft, and in the water-stop structure of the water-bottom tunnel and the shaft for extrusion, which inserts the water-bottom tunnel into the opening to stop water, the inner circumference of the opening of the shaft. A plurality of seal brushes are installed on the surface at a predetermined interval, the free ends of each seal brush are elastically contacted with the water bottom tunnel, and a highly viscous fluid is injected into the compartment defined between the water bottom tunnel and the seal brush. Along with the inner peripheral surface of the outermost opening of the seal brush,
A water stop structure of a water bottom tunnel and a vertical shaft for extrusion, which is equipped with an expansion / contraction sealing material capable of controlling expansion / contraction by supplying / discharging a fluid. The present invention forms an opening for inserting a water-bottom tunnel in the front surface of the shaft, and in the water-stop structure of the water-bottom tunnel and the shaft for extrusion, which inserts the water-bottom tunnel into the opening to stop water, the inner circumference of the opening of the shaft. A plurality of seal brushes are installed on the surface at a predetermined interval, the free ends of each seal brush are elastically contacted with the water bottom tunnel, and a highly viscous fluid is injected into the compartment defined between the water bottom tunnel and the seal brush. In addition, the outermost and innermost opening inner peripheral surfaces of the seal brush are respectively equipped with expansion and contraction sealing materials capable of operating expansion and contraction by supply and discharge of fluid, characterized in that It has a waterproof structure. The present invention is the water blocking structure for a water bottom tunnel and a vertical shaft for extrusion according to any one of the above, wherein the high-viscosity fluid is grease. The present invention is the water blocking structure for a water bottom tunnel and a vertical shaft for extrusion according to any one of the above, wherein the seal brush is attached to the opening of the vertical shaft by a replaceable bolt. In the invention, in any one of the above, the expansion / contraction sealing material has a cross section M.
A water-stop structure for a water-bottom tunnel and a vertical shaft for extrusion, characterized by being a rubber seal material that has a shape and expands by pouring water when the water-bottom tunnel is not extruded. According to the present invention, in any one of the above, the shaft front surface forming the shaft is configured as a double wall, and an expansion / contraction sealing member that expands / contracts by supplying and discharging fluid is attached to the outermost side of the front wall, and a high viscosity A water blocking structure of a water bottom tunnel and a vertical shaft for extrusion characterized in that a seal brush capable of injecting a fluid is attached, and a separate expansion / contraction sealing material that expands / contracts by supplying / discharging the fluid is attached to a rear wall.

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings.

<A> Assumed Structure FIG. 2 shows a cross-sectional view of the starting portion of the subsea tunnel 10, and FIG.
The plan view is shown in FIG. Up to now, the production and extrusion work of the underwater tunnel were performed on land, but in the present embodiment, it is premised that the vertical shaft 20 is constructed at a position near the coastline, and the underground tunnel is constructed and pushed out within the vertical shaft 20. . Vertical shaft 20
Is constructed by, for example, cutting and cutting all four sides, then casting the vertical shaft body in place, or hanging an existing concrete box. The construction technology of the vertical shaft 20 itself is not the object of the present invention, and various known construction methods can be adopted.

Reference numeral 11 in the figure is a temporary revetment constructed along the coastline. Reference numeral 12 is a trench constructed by dredging along the extrusion direction of the subsea tunnel 20, and temporary supports 13 that support the lower surface of the subsea tunnel 20 are installed at equal intervals. The vertical shaft 20 is provided with a space where the water-bottom tunnel 20 can be framed, and a pushing means for pushing the constructed water-bottom tunnel 20 to the seabed side. The pushing means has a property such that a known means such as a cylinder pushing mechanism using fluid pressure or a pushing mechanism using rope material can be applied.

<B> Water stop structure on the front of the shaft As shown in FIG. 2, the front surface 21 of the shaft 20 has an opening 2 slightly larger than the sectional shape of the subsea tunnel 20 (for example, about 4 cm).
2 has been opened. A water blocking structure as shown in FIG. 1 is adopted for the opening 22.

That is, the front surface 21 forming the opening 23 of the vertical shaft 20 is constructed as a double wall of a front wall 21a and a rear wall 21b as shown in the drawing. The inner peripheral surface of the front wall 21a is provided with two types of water stopping means. That is, the first expansion / contraction sealing material 24 is arranged at the position closest to the sea side (outermost side), and the plurality of seal brushes 25 are arranged on the land side of the first expansion / contraction sealing material 24. The first expansion / contraction sealing material 24 is, for example, a hollow rubber sealing material having an M-shaped cross section, and is filled with water by a pump P ₁ disposed inside the shaft 20 through a flow path 26 formed in the body of the shaft 20 to drain and drain water. The expansion and contraction can be operated remotely.

The seal brush 25 is composed of an endless strip of a large number of brush wires, and a plurality of one ends of each seal brush 25 are arranged on the inner peripheral surface of the front wall 21a with a predetermined interval. The total length of each seal brush 25 is set such that its free end is in elastic contact with the water bottom tunnel 10. Further, although each seal brush 25 may be fixed by welding or the like, it is desirable that the seal brushes 25 are replaceably attached by bolting or the like. Since almost no water blocking effect can be expected by the seal brushes 25, the compartments 28 formed between the seal brushes 25 and the pump P ₂ arranged inside the vertical shaft 20 are connected by the flow passage 27 to form the compartments 28. By injecting the highly viscous fluid 29 into the inside and controlling the injecting amount and the pressure of the highly viscous fluid 29, it is possible to ensure good water shutoff while allowing sliding of the water bottom tunnel 10. As the high-viscosity fluid 29, grease for lubrication can be used, for example. The point is that it is a highly viscous fluid, and any known fluid that does not cause environmental problems even if it is dissolved in the sea can be used.

Further, a second expansion / contraction seal material 30 having the same structure as the first expansion / contraction seal 24 is mounted on the inner peripheral surface of the rear wall 21b. The water injection and drain operation of the second expansion / contraction sealing material 30 may be performed by the pump P ₁ or may be performed by a separate pump. Of the three water-stop means described above, the water-stop means by the seal brush 25 and the high-viscosity fluid 29 is mainly used, and the first and second seal members 24, 30 play an auxiliary role. Even though it is auxiliary, the first
The expansion / contraction sealing material 24 needs to be designed so as to be able to stop the water independently when it is replaced due to wear of the seal brush 25.

[0013]

[Operation] Next, a method of constructing a subsea tunnel will be described.

<A> Preparation for extrusion Vertical shaft 20 provided with the water-stop structure in a state of being temporarily cut off.
After constructing, the water bottom tunnel 10 is constructed in the air in the vertical shaft 20 and inserted into the opening 23 of the vertical shaft 20. At this time, the first and second sealing materials 2 installed in the opening 23 of the vertical shaft 20
The provisional cutoffs are opened in a state where the high viscosity fluid 29 is injected under pressure between the seal brushes 25 by injecting water into each of the seal brushes 4 and 30 for expansion. As a result, the water pressure acts on the opening 23 of the vertical shaft 20 and the location of the first expansion / contraction sealing material 23, but the expansion force of the first expansion / contraction sealing material 23 to be crimped to the subsea tunnel 10 and the viscosity and injection of the high-viscosity fluid 29. Due to the pressure and the expansion force of the second expansion / contraction sealing material 30 that is pressure-bonded to the water bottom tunnel 10, the infiltration of water into the vertical shaft 20 is effectively prevented by the three-stage water stopping means. The injection pressure of the high-viscosity fluid 29 is basically maintained by the rigidity of the seal brush 25.

<B> Extension of Submerged Tunnel Under the condition where water is stopped by the above three means for stopping water, a submerged tunnel is extended by a predetermined span at the tail end of the submerged tunnel 10 in the vertical shaft 20.

<C> Extrusion After the water-bottomed tunnel 20 has a predetermined span, the water-bottomed tunnel 20 is extruded to the seabed side by a known extrusion means. When the water bottom tunnel 20 is pushed out, the first and second expansion / contraction sealing materials 24 and 30 shown in FIG. 1 are contracted so that they do not become an extrusion resistance element of the water bottom tunnel 20. At the time of extrusion, the water pressure is maintained by the injection pressure of the high-viscosity fluid 29 in the compartment 28 defined by the seal brush 25. However, leakage of the high-viscosity fluid 29 due to the extrusion of the water bottom tunnel 10 is prevented. Considering this, the pump P ₂ is appropriately operated to replenish the compartment 28 with the high-viscosity fluid 29 to maintain good water shutoff. The water bottom tunnel 10 is extended by repeating the above tunnel extension step and the water bottom tunnel extrusion step.

<D> Replacement of Seal Brush It is expected that the seal brush 25 will be worn away by the extrusion of the water bottom tunnel 10 and the water stopping function will be deteriorated. In this case, the worn seal brush 25 is removed and replaced with a new one in a state where only the first expansion / contraction sealing material 24 is expanded and sealed. For removing and replacing the seal brush 25, for example, as shown in FIG.
1c is used.

[0018]

[Embodiment 2] The combination of the three water stopping means described above is most suitable for the water stopping structure of the vertical shaft 20, but the second innermost expansion / contraction sealing member 30 is omitted in consideration of the tunnel diameter, the generated water pressure and the like. Or the first and second expansion / contraction sealing materials 24, 30
May be omitted.

[0019]

[Third Embodiment] In the first embodiment described above, the front surface 21 of the shaft 20 has a double wall, but the three water stopping means described above are provided on the inner peripheral surface of the opening 23 of the single wall. Of course, you can do that.

[0020]

Since the present invention is as described above, the following effects can be obtained. <B> By injecting a high-viscosity fluid between the seal brushes and adjusting the injection quality of the high-viscosity fluid and the injection pressure, it is possible to secure water shutoff between the vertical shaft opening and the water bottom tunnel. Therefore, the water bottom tunnel can be constructed while suppressing the extrusion resistance of the water bottom tunnel and ensuring good water blocking performance. <B> The expansion / contraction sealing material arranged before and after the seal brush contributes to the improvement of the water blocking performance between the vertical shaft and the bottom tunnel when not extruding, and also contracts during the extrusion to become the extrusion resistance element of the bottom tunnel. You can avoid that. <C> When constructing a subsea tunnel, it is possible to effectively stop water with multiple water stop means, which further improves the safety of work in the shaft. <D> It is possible to replace the worn-out seal brush with a new one while the outermost expansion / contraction seal material is expanded to stop water.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a water stop structure of a vertical shaft and a water bottom tunnel.

[Fig. 2] Vertical section of the shaft

FIG. 3 is a plan view thereof

FIG. 4 is an explanatory view of a technique for constructing a subsea tunnel, which is a premise of the present invention.

Claims (7)

[Claims] 1. In a water stop structure of a water bottom tunnel and an extrusion shaft, wherein an opening for inserting a water bottom tunnel is formed on the front surface of the shaft, and the water bottom tunnel is inserted into the opening to stop water. A plurality of seal brushes are installed on the inner peripheral surface at a predetermined interval, and the free ends of each seal brush are elastically contacted with the water bottom tunnel, and a highly viscous fluid is placed in the compartment defined between the water bottom tunnel and the seal brush. Water injection structure of water bottom tunnel and vertical shaft for extrusion. 2. A water-stopping structure for a water bottom tunnel and an extrusion shaft, wherein an opening for inserting a water bottom tunnel is formed on the front surface of the shaft, and the water bottom tunnel is inserted through the opening to stop water. A plurality of seal brushes are installed on the inner peripheral surface at a predetermined interval, and the free ends of each seal brush are elastically contacted with the water bottom tunnel, and a highly viscous fluid is placed in the compartment defined between the water bottom tunnel and the seal brush. And a sealant material capable of controlling expansion and contraction by supplying and discharging a fluid is attached to the inner peripheral surface of the outermost opening of the seal brush. Construction. 3. A water-stop structure for a water bottom tunnel and an extrusion shaft, wherein an opening for inserting a water bottom tunnel is formed on the front surface of the shaft, and the water bottom tunnel is inserted through the opening to stop water. A plurality of seal brushes are installed on the inner peripheral surface at a predetermined interval, and the free ends of each seal brush are elastically contacted with the water bottom tunnel, and a highly viscous fluid is placed in the compartment defined between the water bottom tunnel and the seal brush. While injecting, on the inner peripheral surface of the outermost and innermost openings of the seal brush,
A water-stop structure for a water-bottom tunnel and a vertical shaft for extrusion, each of which is equipped with an expansion-contraction seal material that can be operated to expand and contract by supplying and discharging fluid. 4. The water stop structure for a water bottom tunnel and a vertical shaft for extrusion according to claim 1, wherein the highly viscous fluid is grease. 5. The water blocking structure for a water bottom tunnel and a vertical shaft for extrusion according to claim 2, wherein the seal brush is attached to the opening of the vertical shaft by means of replaceable bolts. 6. The water bottom according to any one of claims 2 to 5, wherein the expansion / contraction seal material is a rubber seal material having an M-shaped cross section and which is inflated by pouring water when the water bottom tunnel is not extruded. Water stop structure for tunnel and vertical shaft for extrusion. 7. The shaft according to claim 3, wherein the shaft front surface forming the shaft is configured as a double wall, and an expansion / contraction seal member that expands / contracts by supplying / discharging a fluid is attached to the outermost side of the front wall. , A seal brush capable of injecting a highly viscous fluid is installed inside it, and a separate expansion / contraction seal material that expands / contracts by supplying / discharging the fluid is installed on the rear wall. Water structure.