JP2756923B2 - Starting shaft water seal device for underwater propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water seal device for a starting shaft for underwater propulsion, and more particularly, to a pipeline used for sewerage, electric wiring, underground walkways, underground roads, etc. Technology to lay underwater
While sequentially adding laying pipes such as fixed-length concrete pipes, add propulsion to the laying pipe row with a main jack, etc.
An underwater propulsion method in which the entire laying pipe row is propelled underwater and laid, which is provided in front of the starting pit where the laying pipe starts and prevents the water from entering the starting pit. It is.

[0002]

2. Description of the Related Art As a method for preventing inundation of water in a starting shaft for underwater propulsion, there is a method disclosed in Japanese Patent Application Laid-Open No. 52-130113. In this method, as shown in FIG. 6, a plurality of partition walls 18 are arranged side by side from the rear side wall 17 of the starting shaft 16. The laying pipe passage of each partition is
A hole slightly larger than the outer diameter of the laying pipe is formed, and a sealing material having a hole slightly smaller than the outer diameter of the laying pipe is provided in the hole. After the laying pipe 19 is sequentially passed through the plurality of partition walls 18, the front side wall 2 of the starting shaft 16 is formed.
After the laying pipe passage of No. 0 is lifted by a crane or the like,
The water is pushed out into the water by a main push jack provided on the fourth compartment 24 side. Each compartment is drained by a drain pump 25 to sequentially lower the water level from the first compartment 21 near the front side wall 20 to the second compartment 22 and the third compartment 23 on the rear side, and a main push jack, etc. This is a method for preventing water from entering the fourth compartment 24 provided with the above.

FIG. 7 shows a situation in which water leaking from the sealing material 26 of the partition wall 18 has penetrated into the first compartment 21. If water has penetrated, the attached drain pump 2 is mounted.
5 operates to drain the water. In the second compartment 22, a part of the water remaining in the first compartment 21 enters through the sealing material 26,
The water is further drained to a lower water level than the first compartment 21, and the water level is sequentially reduced to the third compartment 23 and the fourth compartment 24. The fourth compartment 24 can be kept almost dry.

[0004]

However, in the prior art described above, in constructing the shaft for underwater propulsion, in order to construct a bulkhead that blocks water, a bulkhead having a width equal to the shaft width must be constructed. It requires many construction days and the construction cost is high.

Further, as shown in FIG. 7, since the width of the partition wall is the shaft width, the space volume of each compartment becomes very large, so that the amount of water entering each compartment also increases, A large capacity drainage pump is also required for the drainage pump for treating wastewater, which increases electricity and equipment costs.

[0006]

SUMMARY OF THE INVENTION In a starting shaft water seal device of the underwater propulsion method of laying underwater by applying a propulsive force to a laying tube line according to the present invention, the laying tube line is covered and the ground shaft of the starting shaft is covered with a ground wall. It is characterized by comprising a fixed outer cylinder, a sealing material for blocking a space formed by the laying pipe and the outer cylinder, and a drainage device provided below each space.

[0007] The inner diameter of the outer cylinder may be set to such a size that the laying pipe and the sealing material can be attached inside the outer casing.

[0008] As a material of the sealing material, generally used rubber, synthetic resin and the like can be used.

The outer cylinder is fixed by attaching clasps fixed to the top and bottom of the outer cylinder to a retaining wall in front of the starting shaft.

[0010]

According to the invention described above, the use of the outer cylinder eliminates the necessity of constructing a partition wall having a width corresponding to the shaft shaft unlike the prior art.

Further, since the volume of space between the outer cylinder and the laying pipe is reduced, the amount of water that enters is small, and the capacity of the drain pump for treating the water that enters is small.

Since the outer cylinder is provided with a plurality of sealing materials (partitions), the preparation for propulsion can be completed only by fixing the clasp of the outer cylinder to the retaining wall.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on one embodiment. FIG. 1 is a vertical sectional view for explaining a starting vertical shaft water sealing device of the present invention. In order to construct the starting shaft 1, the surrounding space is surrounded by earth retaining walls made of steel sheet pile or the like on all four sides. Starting shaft 1
Front retaining wall 2 faces the water W, and the front retaining wall 2
Is a laying pipe starting surface from which the laying pipe 3 starts. The rear retaining wall 4 is embedded and constructed in the ground E. The front retaining wall 2, which is the laying pipe starting surface, can be pulled out when the laying pipe starts. The other rear retaining wall 4 does not need to be able to be pulled out.

In order to fix the outer cylinder 5 to the front retaining wall 2 of the laying pipe starting surface, both ends of the clasp 6 are fixed to the front retaining wall 2. Since the front retaining wall 2 is pulled out so that the laying pipe can be started, the clasps 6 are fixed to the front retaining wall 2 on both sides of the unremoved portion.

A plurality of sealing members 7 for blocking water entering from the front into the space formed by the laying pipe 3 and the outer cylinder 5 covering the laying pipe 3 are provided in the outer cylinder 5, and each of the compartments is provided. 10, 1
A drain pump 8 is provided at the lower part of each of the compartments 10, 11, 12, and 13 so that the water accumulated in 1, 12, and 13 can be drained to the outside.

FIG. 2 is a longitudinal sectional view for explaining the situation where the front retaining wall 2 is pulled out upward, and the laying pipe 3 is propelled from the starting shaft 1 into the water. The tip of the laying pipe 3 is closed with a lid 9 so that water does not enter.

In the space between the outer cylinder 5 and the laying pipe 3, compartments 10, 11, 12, 13 are formed at regular intervals in the propulsion direction so that the sealing material 7 is in close contact with the laying pipe 3. It has a structure to prevent infiltration.

When the laying pipe 3 approaches the front retaining wall 2 and the front retaining wall 2 is pulled upward, water W penetrates into the inside of the outer cylinder 5 through a gap between the front retaining wall 2 and the laying pipe 3. The sealing material 7 is applied to the outer cylinder 5 from several places near the front retaining wall 2 side.
, The water W cannot freely pass through the outer cylinder 5. However, since the sealing member 7 and the laying pipe 3 are not in a completely water-sealed state, it is impossible to prevent a certain amount of water W from entering the back first compartment 10 through the gap. This means that the second compartment 11, the third compartment 12,
The same applies to the fourth compartment 13.

The water that has entered each compartment is drained by a drain pump 8, and the water level is sequentially reduced from a first compartment 10 near the front retaining wall 2 to a second compartment 11 and a third compartment 12 behind. Thus, water is prevented from entering the fourth compartment 13 provided with the main push jack 14 and the like.

FIG. 3 is a plan view of FIG.
This is a state in which the laying pipe 3 is being pushed into the water from the starting shaft 1 by the main push jack 14.

In the underwater propulsion construction process, the starter shaft 1 is constructed, and the outer cylinder 5 in which a plurality of sealing materials 7 are set in the shaft.
Is fixed to the front retaining wall 2 with the clasp 6, and the laying pipe 3 is inserted into the outer cylinder 5. Then, the front retaining wall 2 is pulled out and propelled underground or underwater. In order to propel the laid pipe row, a propulsive force is applied to the laid pipe row by a main push jack 14 or the like installed in the starting shaft 1. Laying pipe 3
In the state of being sequentially connected by bolting, welding, bonding, and other means, it is promoted as in the prior art.

FIG. 4 is a front view of FIG. The front retaining wall 2 is connected by fitting steel sheet piles having a width of about 40 cm, and several laying pipes 3 are pulled upward by a crane or the like when the laying pipe 3 approaches the front retaining wall 2. At this time, a gap is formed between the pulled-out front retaining wall 2 and the outer cylinder 5. Therefore, the water blocking plate 30 made of steel or the like is welded and fixed to the front retaining wall 2 and the outer cylinder 5 which are not drawn. . At the bottom of the outer cylinder 5 in each compartment, a hole is provided through which the drain pipe 15 passes, and the drain pipe 15 sucks the water and drains it to the outside.

FIG. 5 is a cross-sectional view of FIG.
(A) shows a cross section of the first compartment 10 and (b) shows a cross section of the second compartment 11. In the cross section of the first compartment shown in FIG. 5A, water flowing from between the laying pipe 3 and the pulled out retaining wall 2 leaks from the sealing member 7 and enters the first compartment 10. This shows the situation, and when water invades, the attached drain pump 14 operates to drain the water.

In the second compartment 11 shown in FIG. 5 (b), a part of the water remaining in the first compartment 10 enters through the sealing member 7, and the water is further drained. This indicates that the water level is lower than 10, and the water level is sequentially reduced to the third compartment 12 and the fourth compartment 13. In the fourth compartment 13, almost dry condition can be maintained.

Although the steel sheet pile is exemplified in the present embodiment as the retaining wall, the retaining wall may be constructed by sinking a concrete wall or may be directly driven.

At the time of propulsion construction in the soil, it is necessary that the laid pipe has an excavation function at the tip.

[0027]

According to the above-described starting vertical shaft water sealing device for the underwater propulsion method according to the present invention, the use of the outer cylinder eliminates the need to construct a partition wall having a width corresponding to the vertical shaft width. Since the number of construction days and materials can be significantly reduced, construction costs are low.

As a result of using the outer cylinder, the space volume between the outer cylinder and the laying pipe is small, the volume of the drain pump for treating infiltrated water may be small, the power cost is low, the handling of the drain pump is small. Will also be easier.

Further, according to the present invention, the outer cylinder is provided with a plurality of sealing materials (partition walls), and the preparation for propulsion can be completed only by fixing the clasp of the outer cylinder to the retaining wall. Work can be done easily.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view for explaining a starting vertical water seal device of the present invention.

FIG. 2 is a longitudinal sectional view for explaining a situation in which a laid pipe is propelled from a starting shaft into water.

FIG. 3 is a plan view in FIG. 2;

FIG. 4 is a front view of FIG. 1.

FIG. 5 is a cross-sectional view of FIG.

FIG. 6 is a longitudinal sectional view illustrating a state in which a laying pipe is propelled underwater from a starting shaft in the prior art.

FIG. 7 is a cross-sectional view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Starting shaft 2 Front retaining wall 3 Laying pipe 4 Rear retaining wall 5 Outer cylinder 6 Clasp 7 Sealing material 8 Drain pump 9 Lid 10 First compartment 11 Second compartment 12 Third compartment 13 Fourth compartment 14 yuan Push jack 15 Drainage pipe 16 Prior art starting shaft 17 Prior art rear retaining wall 18 Prior art bulkhead 19 Prior art laying pipe 20 Prior art retaining wall 21 First compartment 22 prior art 22 Second prior art Compartment 23 Prior art third compartment 24 Prior art fourth compartment 25 Prior art drainage pump 26 Prior art sealing material 27 Space 28 Prior art side retaining wall 29 Prior art laying pipe 30 Waterstop

Claims (1)

(57) [Claims] An underwater propulsion start-up shaft water sealing device in which a propulsion force is applied to a laying pipe row to lay it underwater, an outer cylinder covering the laying pipe row and fixed to a retaining wall of the starting pit, A starting vertical shaft water sealing device for a submersible propulsion method, comprising: a plurality of sealing materials for blocking a space formed by a pipe and an outer cylinder; and a drainage device provided at a lower portion of each space.