JP3067376B2 - Middle press 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 middle-push method in a propulsion method used when laying a tunnel in the ground.

Conventionally, in urban areas, water and sewage, gas,
2. Description of the Related Art In tunnel construction such as power lines and communication lines, a construction method called a propulsion construction method is widely used in order to perform construction without restricting traffic on the ground.

In this propulsion method, as shown in FIG. 3, a construction section is appropriately divided, and a shaft 1 is excavated at both ends of the section.
While excavating the horizontal shaft 2 horizontally from the shaft 1, the pipes 3 such as fume pipes are pushed from the shaft 1 into the horizontal shaft 2 by a large number of jacks 5 of the main pushing device 4.

[0004] As the excavation of the shaft 2 proceeds, new pipes 3 are successively added to the rear end of the pipe 3 in the shaft 1 and pushed in from the rear end, and finally a tunnel is formed until the next shaft. You do it.

In this method, as the excavation of the horizontal shaft 2 proceeds, the length of the cave becomes longer, and the number of pipes 3 pushed into the cave increases. Therefore, it becomes difficult to push the tube 3 only by the propulsive force of the main pushing device 4.

Therefore, usually, for every predetermined number of tubes 3, an intermediate pressing device 7 is inserted between the tubes 3, and the intermediate pressing device 7 and the main pressing device 4 cooperate to form a large number of tubes 3. Is promoted.

More specifically, referring to FIG. 3, first, the jack 5 of the intermediate pressing device 7 is operated, and the intermediate pressing device 7 is operated.
Is supported by the rear pipe 3, and the front pipe 3 is propelled by the stroke length of the jack 5 and pushed into the horizontal shaft 2.

Thereafter, the stroke of the jack 5 of the intermediate pushing device 7 is reduced, and the jack 5 of the main pushing device 4 is operated. Then, the main pushing device 4 is supported by the supporting wall 18 of the starting shaft and does not retreat, and the pipe 3 between the main pushing device 4 and the middle pushing device 7 is propelled by the stroke length.

Subsequently, the stroke of the jack 5 of the main pushing device 4 is reduced to insert the spacer 6, or the new pipe 3
And the intermediate pushing device 7 and the jack 5 of the main pushing device 4 are alternately operated again.

By repeating this series of cooperative operations of the main pushing device 4 and the middle pushing device 7, the tubular body 3 is sequentially propelled without imposing an excessive load on the main pushing device 4 to cut a long sinus passage. It forms.

In FIG. 3, only one intermediate pressing device 7 is provided. However, when a long sinus is formed, the intermediate pressing device 7 is installed at a plurality of positions for every predetermined number of tubes 3. Then, it can be sequentially operated from the front middle pushing device 7 to be sequentially propelled from the front pipe 3.

When the tip tube 3 reaches the next shaft 1, the jacks 5 are sequentially removed from the front middle pushing device 7, and the rear tube 3 is propelled to be connected to the front tube 3. Eventually, a continuous tunnel is formed between the shafts 1.

[0013]

2. Description of the Related Art In this construction method, it is generally difficult to secure watertightness in a middle-push device, and groundwater flows into a cave, which often makes construction difficult. The applicants and the like have invented a water-tight middle-pushing device that does not allow groundwater to enter, and filed a patent application as Japanese Patent Application No. 1-135105.

In this apparatus, as shown in FIG. 4, an intermediate push tube 8 is fitted to the end of one adjacent tubular body 3b, and the sleeve 10 supported by the end of the other tubular body 3a is pushed inward. The jack 5 is slidably fitted to the outside of the tube 8, the jack 5 is interposed between the middle push tube 8 and the other tube body 3 a, and the sleeve 10 is inserted between the middle push tube 8 and the sleeve 10. A flexible tubular membrane member 14 folded in a substantially U shape so as to open to the terminal side is interposed, and both ends of the tubular membrane member 14 are fixed to the outer surface of the middle push tube 8 and the inner surface of the sleeve 10, respectively. is there.

In this device, the tubular membrane member 14 prevents the infiltration of groundwater from outside and waterproofs it.
When the jack 5 is actuated to cause the middle push tube 8 and the sleeve 10 to slide relative to each other, the cylindrical membrane member 14
However, since the inner and outer surfaces are reversed at the folded portion 15, sliding between the two is allowed without generating a large frictional resistance.

[0016]

However, in this apparatus, the tubular membrane member 14 is a thin and flexible member, which is usually a woven fabric coated with rubber or a soft synthetic resin. However, it cannot be said that it is highly durable and is easily consumed.

The tubular membrane member 14 is folded at the folded portion 15 so that the inner portion and the outer portion overlap, and the tubular film member 14 is turned over at the folded portion 15 so that the inner portion and the outer portion are interchanged with each other. Although it follows the sliding with the middle push tube 8, the reversal at the folded portion 15 is not smoothly performed, and the inner portion and the outer portion are overlapped and rounded while being doubled. And it may be damaged by being pinched between the inner push tube 8 and the inner push tube 8.

Further, when sand particles enter between the middle-pushed tube 8 and the sleeve 10 and enter the tubular membrane member 14, the sand particles roll between the middle-pushed tube 8 and the sleeve 10 as the sleeve slides. In some cases, the tubular membrane member 14 may be damaged.

As shown in the drawing, a packing 16 is attached to the inner surface of the distal end of the sleeve 10, and the sleeve 16 is attached by the packing 16.
Sealing the gap between 0 and the centrally pressed tube 8 can reduce the penetration of sand particles to some extent.
6 itself wears due to friction with the middle-pushed tube 8, and the penetration of sand particles cannot be reliably prevented.

Further, by applying a lubricant to the space 17 between the packing 16 and the tubular membrane member 14, it is possible to prevent the tubular membrane member 14 from being damaged, but this is not sufficient. . In particular, penetration of sand particles cannot be prevented, and once the sand particles have entered, it is inevitable that the tubular membrane member 14 will be damaged.

If the packing 16 is worn out, the lubricant leaks out, so that a sufficient effect cannot be expected.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent sand particles from entering the space 17, prevent damage to the tubular membrane member 14, and more completely prevent infiltration of groundwater. It is intended for.

According to the present invention, one of the adjacent pipes is provided in the middle-push method in which a middle push jack is interposed between adjacent pipe bodies in the propulsion method, and the front pipe body is propelled into the horizontal shaft by the middle push jack. The middle-pushed tube fitted to the end of the body and the sleeve supported at the end of the other body are slidably fitted to each other, and opened between the middle-pushed tube and the sleeve toward the end of the sleeve. A flexible tubular membrane member folded in a substantially U-shape is interposed, and both ends of the tubular membrane member are fixed to the outer surface of the intermediately pressed tube and the inner surface of the sleeve, respectively.
At the distal end of the sleeve, a hard packing that protrudes inward and slidably contacts the outer surface of the intermediately pressed tube is attached, and a space between the cylindrical membrane member and the packing between the sleeve and the intermediately pressed tube. While press-fitting a lubricant at a constant pressure from a pressure vessel into the inside, a plurality of jacks interposed between the middle-pushed pipe and the other pipe body are expanded and contracted, and the tubular membrane member is folded at its folded portion. In both cases, the two pipes are alternately propelled while being inverted, and the lubricant is circulated between the pressure vessel and the space with the change in the volume of the space accompanying the operation, and the pressure in the space is always kept constant. It is characterized by the following.

In this intermediate pressing method, it is preferable that a pressure higher than the external water pressure acting on the centrally pressed pipe is applied to the lubricant in the space so that the lubricant is ejected from the gap between the packing and the centrally pressed pipe.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show an example of an intermediate pressing device for implementing the present invention. In this drawing, portions denoted by the same reference numerals as those in FIG. 4 are the same portions having the same functions.

In this embodiment, the cylindrical membrane member 14
Is folded in a substantially U-shape that opens toward the distal end side of the sleeve 10 at the folded portion 15, the outer end thereof is fixed to the inside of the distal end of the sleeve 10, and the inner end is the inner push tube 8. It is attached to the outer circumference.

At the end of the sleeve 10 is mounted a hard packing 16 projecting inward and slidably in contact with the outer surface of the middle push tube 8.

The through hole 1 is located slightly behind the mounting position of the inner end of the tubular membrane member 14 in the middle push tube 8.
8 are drilled.

Reference numeral 19 denotes a pressure vessel provided in the pipe body 3. The pressure vessel 19 contains a lubricant 20, and a space 21 is formed above the lubricant 20 in the pressure vessel 19. Is formed.

A lubricant press-fitting pipe 22 is connected to the lower part of the pressure vessel 19, and the tip of the lubricant press-fitting pipe 22 is connected to the inside of the through hole 18, and the middle press pipe 8 and the sleeve 1 are connected to each other.
The space 17 communicates with a space 17 between the cylindrical membrane member 14 and the packing 16.

An air compressor 24 is connected to the upper part of the pressure vessel 19 via an air hose 23 so that compressed air is sent from the air compressor 24 into the space 21 above the pressure vessel 19. Has become.

When compressed air is fed from the air compressor 24 into the space 21 of the pressure vessel 19, the pressure vessel 19 is pressurized, and the lubricant 20 in the pressure vessel 19 is changed into a lubricant press-fit pipe 22. Through the through hole 18 and the space 17
Pressed into. At this time, it is preferable that the pressure is at least higher than the external water pressure of the groundwater applied to the middle push pipe 8.

As the lubricating material 20 used here, a lubricating material usually used in civil engineering works of the same type can be used. For example, a material in which bentonite and mud oil are dispersed in water together with a stabilizer is suitable. It is.

When the lubricant 20 is press-fitted into the space 17, the air in the space 17 is released from the middle press pipe 8 and the packing 16.
Is extruded from the minute gap between
Filled with 0.

When the jack 5 is operated and extended in this state, the front tube 3a is pushed forward by the jack 5 as shown in FIG. 2, and the sleeve 10 attached to the tube 3a is also moved. Proceed forward.

As a result, the packing 16 slides forward along the outer surface of the middle push tube 8, and the outer portion of the tubular membrane member 14 also advances forward, so that the folded portion 15 is turned over so that the outside is inside.

Accordingly, the volume in the space 17 is reduced.
The lubricant 20 in the space 17 is returned from the through hole 18 into the pressure vessel 19 through the lubricant press-fitting pipe 22.

After the jack 5 is extended and the tube 3a is advanced by the stroke, the jack 5 is contracted,
When the jack 5 of the main pushing device 4 is extended, the tube 3b at the rear of the middle pushing device 7 is advanced.

As a result, while the sleeve 10 is stationary, the middle-pushed tube 8 advances, and returns to the state shown in FIG.

At this time, the packing 16 slides to the rear of the intermediately pushed tube 8, and the tubular membrane member 14 is inverted at the folded portion 15 so that the inside is turned outside, and the volume in the space 17 is reduced. Expanding. Then, a lubricant 20 is supplied from the pressure vessel 19 to the expanded volume.

Hereinafter, similarly, the middle pressing device 7 and the main pressing device 4
By pushing the front pipe 3a and the rear pipe 3b of the intermediate pressing device 7 alternately, thereby performing the propulsion method and the lubricating material accompanying the fluctuation of the volume of the space 17 accompanying the propulsion method. Flowing 20 between the space 17 and the pressure vessel 19;
The pressure of the lubricant 20 filling the space 17 is always kept constant.

[0042]

According to the present invention, the packing 16 and the cylindrical membrane member 14 prevent groundwater from entering the inside pushing device 7.

The packing 16 slides on the outer surface of the intermediately pressed tube 8 with the relative reciprocation of the sleeve 10 and the intermediately pressed tube 8, and the lubricating material 20 has a lubricating effect on the sliding. None, wear of the packing 16 is reduced.

The cylindrical membrane member 14 is pressed against the sleeve 10 by the pressure of the lubricant 20 in the space 17, and the inner part is pressed against the middle-pushed tube 8 by the pressure of the lubricant 20. The friction between the turning portion 15 and the inner portion is reduced, and the inversion at the turning portion 15 is performed smoothly.

Further, the wear of the packing 16 and the sleeve 1
A gap may occur between the packing 16 and the middle-pushed tube 8 due to a deviation in the relative position between the packing 0 and the middle-pushed pipe 8, and the like. By making it higher, the lubricant 20
To prevent sand particles and the like from entering between the sleeve 10 and the middle-pushed tube 8.

Although the amount of the lubricant 20 in the pressure vessel 19 is reduced by the ejection of the lubricant 20 from the gap, the pressure vessel 19 is installed in the tube 3 having a sufficient width. It is possible to accommodate the amount of the lubricant 20 in the interior 19 in consideration of the above-mentioned consumption.

[0047]

Thus, according to the present invention, the consumption of the packing 16 is reduced, and the lubricant 20 is ejected from the gap between the packing 16 and the middle-pushed pipe 8 to thereby reduce the space 17.
Intrusion of sand particles and the like into the inside is prevented, and damage of the tubular membrane member 14 due to the rolling of the sand particles between the sleeve 10 and the middle-pushed pipe 8 is prevented, and infiltration of groundwater into the middle-push device 7 is prevented. It can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing an embodiment of an intermediate pressing device for implementing the present invention.

2 is a central longitudinal sectional view of the embodiment of FIG. 1 with a jack extended.

FIG. 3 is a central longitudinal sectional view showing an implementation state of a propulsion method.

FIG. 4 is a central longitudinal sectional view of a conventional middle pressing device 2 horizontal shaft 3 tube 4 main pressing device 5 jack 7 middle pressing device 8 middle pressing tube 10 sleeve 14 cylindrical membrane member 15 folded portion 16 rigid packing 17 space 19 pressure vessel 20 Lubricants

Continued on the front page (72) Katsuhiko Higashi, Inventor 1-4-1 Kishibekita, Suita-shi, Osaka (72) Ryoji Tatsujo 1-33-1, Ozashi, Takatsuki-shi, Osaka Iriya Heights B-205 ( 72) Inventor Teruhisa Minano 9-6-3, Iwanaridai, Kasugai-shi, Aichi (72) Inventor Mamoru Yamana 44-11, Eggplant Sakuhigashi-cho, Hirakata-shi, Osaka (56) References JP-A-3-2494 (JP, A) JP-A-3-253695 (JP, A) JP-A-4-77693 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 311 E21D 9/06 301

Claims (2)

(57) [Claims] 1. An adjacent pipe (3a, 3) in a propulsion method.
In the middle-pressing method in which a middle pushing jack (5) is interposed between b) and the front pipe (3a) is propelled into the horizontal shaft (2) by the middle pushing jack (5), one adjacent pipe ( 3b), the middle pressed tube (8) fitted to the end and the sleeve (10) supported at the end of the other tube (3a) are slidably fitted to each other, and the middle pressed tube (8) is fitted. And sleeve (1
0) between the end of the sleeve (10) and the approximate U
A flexible tubular membrane member (14) folded in the shape of a letter is interposed, and both ends of the tubular membrane member (14) are fixed to the outer surface of the middle push tube (8) and the inner surface of the sleeve (10), respectively. A rigid packing (16) is attached to the distal end of the sleeve (10) so as to protrude inward and slidably abut on the outer surface of the middle push tube (8), and the sleeve (10) and the middle push tube (8) are attached. The tubular membrane member (14) between
While the lubricant (20) is always press-fitted from the pressure vessel (19) at a constant pressure into the space (17) between the gasket and the packing (16), the middle-pushed pipe (8) and the other pipe (3a) are pressed. ), The plurality of jacks (5) interposed therebetween are expanded and contracted, and the tubular membrane member (14) is folded back (15).
In both cases, the two pipes (3a, 3b) are alternately propelled while being inverted, and the volume of the space ( 17) varies with the operation.
And the space between the pressure vessel (19) and the space (17).
The lubricant (20) is circulated and the pressure in the space (17) is constantly
Middle-pressing method characterized by maintaining a constant 2. A center push method of claim 1, a pressure higher than the outside pressure acting on the middle push tube (8) to the lubricant (20) in said space (17) was added, and the packing (16)
A middle- push method characterized by ejecting a lubricant (20) from a gap with the middle-push pipe (8).