JP3134731B2 - Water-blocking structure and reaching penetration method at the shaft entrance of the shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watertight structure and a penetration method at a shaft entrance of a shield machine, and more particularly, to a shield machine having an opening formed by mirror-cutting a side wall of a shaft. When penetrating the mouth, the water stop structure for preventing groundwater from flowing into the shaft from the arrival port, and the shield excavator that arrived, after restarting the shaft of the shaft of the shaft, restarting, The present invention relates to a reaching penetration method for penetrating a reaching opening formed with an opening.

[0002]

2. Description of the Related Art Particularly in the field of urban civil engineering, a tunnel construction method using a shield machine is known as a method for excavating and forming a tunnel in the ground where groundwater is present or in a relatively soft ground. The tunnel construction method using this shield machine generally excavates a face face with a shield machine, assembles segments behind it to form a lining body, and protects the inner wall surface of the tunnel with such lining body The tunnel is excavated and formed while obtaining the propulsion reaction force from the lining body.

[0003] In the tunnel construction method using such a shield excavator, usually, for example, the tunnel is divided for every predetermined tunnel extension of several hundred meters to several kilometers, and the shield excavator is provided at both ends of each of these sections. A shaft as a starting or reaching facility is constructed underground as a concrete structure by, for example, a continuous underground construction method, and a shield tunnel excavated and formed in each section is communicated through these shafts. As a result, a considerably extended tunnel in which each shield tunnel is integrated is constructed.

That is, according to the tunnel construction method using the shield excavator, the shield excavator is started from the shaft or reaches the shaft in each section so that the shield tunnel can communicate with the shaft. It is necessary to say that the starting and arriving work of such a shield excavator tightens an important point of the shield tunnel construction, and it is not an exaggeration to say that it determines the success or failure of the construction.

[0005] In each of these starting and reaching works, an opening is formed in the side wall of the shaft, and the shield excavator penetrates the ground through the opening, or advances from the ground to the inside of the shaft. Therefore, it is necessary to perform such starting work and reaching work while preventing water from flowing out from the opening and outflow from the ground. Of these starters and arrivals, a stable construction method has been adopted for the starter by adopting starter protection as an auxiliary method using various ground improvement methods and starting portals using entrance packing. Established.

[0006]

On the other hand, as for the arrival work, as in the case of the start work, the arrival protection work by various ground improvement methods is adopted as an auxiliary method. In particular, it is not possible to use highly water-tight packing, so the shield excavator must be stopped before reaching the side wall of the shaft, and the side wall must be mirror-cut (mirror cut) to form an access port. Regarding the so-called re-entry of a shield excavator, in which the excavator is restarted and the tip portion penetrates into the arrival port, a stable construction method has not yet been established.

That is, according to the conventional reaching works, when the pressure of the groundwater is low, only the above-mentioned reaching protection works are used together. In such a state, the mirror shaving or the shield excavator may be restarted. However, even when the pressure of the groundwater is low, there is a problem that the work may be hindered by the flooding.

Further, when the pressure of the groundwater is high, a gap is easily formed between the improved ground and the outer peripheral surface of the shield machine, particularly when the shield machine restarts.
Therefore, in order to avoid the occurrence of water flowing out of such gaps as a water path, furthermore, a chemical liquid injection method or a freezing method is constructed, or other measures are implemented, but such measures are generally expensive and However, there is a problem in that the work requires a considerable amount of time, which causes a delay in the work.

In view of the above, the present invention has been made in view of such a conventional problem. After reaching the shield excavator, the shield excavator is re-started at the reaching opening formed by mirror cutting. It is an object of the present invention to provide a watertight structure at a shaft reaching port of a shield machine which can easily and economically prevent water from flowing from the ground side when penetrating a tip portion of the shaft excavator.

[0010] Further, the present invention is to easily and stably prevent water from flowing from the ground side into a reaching opening formed by mirror shaving, and to promptly re-enter the shield machine. It is an object of the present invention to provide a method of reaching a penetration of a shield excavator which can be performed.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the gist of the invention is to provide a shield excavator which has been reached by shaving the side wall of a shaft to form an opening. When penetrating into the shaft, a water stop structure for preventing groundwater from flowing into the shaft from the arrival port, so as to be in close contact with the inner peripheral surface of the wall of the arrival port, the shield machine consists foamed urethane layer formed on the tip outer peripheral portion, while maintaining a close contact between the foam urethane layer the wall inside peripheral surface, the sliding penetration to Resid Rudo excavation the shield machine through the access openings At the shaft entrance of the machine
The shield formed on the outer periphery of the tip of the shield machine
Foam urethane layer is to form by injecting filling the foamed urethane filling the space formed by the ring-shaped frame member mounted along the front surface outer peripheral portion of the shield machine after completion of the mirror斫Ri .

Further, the water stop structure of the invention, the the wall inside the peripheral surface of the access openings forms a access openings onset foam urethane layer by blowing foamed urethane,該到our mouth onset foam urethane <br / > while maintaining the emission layer adhesion state between the shield machine of foamed urethane layer, it is preferable to slide penetrate the shield machine through the access openings.

[0013] Further, another gist of the present invention is an attainment penetrating method for re-starting the reached shield excavator after cutting the side wall of the shaft and then penetrating the opening formed at the opening. Before the shield machine reaches the reaching part of the reach of the shield machine, or after the shield machine reaches the stop part and stops, use the ground improvement method such as the chemical liquid injection method or the freezing method to perform the protection work. Performing the step and mirror-cutting the shaft wall to form an opening, so that the front surface of the shield machine that has reached and stopped just before the shaft wall by excavation work faces the arrival port. a step of Maseru, said to be in close contact with the wall inside the peripheral surface of the access openings, forming a foamed urethane layer on the tip outer peripheral portion of the shield machine, the wall body of the foam urethane layer the access openings Close contact with peripheral surface While maintaining, certain shield machine to reach penetration method of shield machine, characterized in that comprising the step of sliding penetration through the access openings.

[0014] The arrival of the shield excavator means that the shield excavator is propelled on a predetermined route while stabilizing the ground up to the shaft reaching surface, and then the shield excavator is opened from an opening prepared in advance. It is a series of operations to stop the shield excavator after drawing it into the shaft or propelling it to the position just before or partly facing the shaft wall as the reaching wall, and then stopping the shield machine. The reached shield excavator means a shield excavator that has reached and stopped just before the side wall of the shaft due to excavation work, and the ground at the reaching part of the shield excavator has an opening at the entrance. It is located on the back side of the shaft wall at the location where it is formed, and when the shield machine stops reaching, the area that will cover the tip of the shield machine and the area around it It is intended to mean the mountain.

[0015] According to the water blocking structure of the shield excavator reaching port of the present invention, the shield excavating machine that has reached is re-started after the mirror portal is cut to form an opening in the side wall of the shaft. shield when penetrating the front end portion reaches port, a foamed <br/> urethane layer formed on the tip outer peripheral portion of the shield machine, while maintaining close contact with the wall inside the peripheral surface of the access openings Advance the excavator.

[0016] That is, foamed urethane expandable, since provided the adhesion to the elasticity and wall inside peripheral surface, for example, such as by constraining the foamed, be brought into contact with the wall inside the peripheral surface of the access openings, since foamed urethane layer will be in close contact while pressing the walls inside circumferential surface, such close contact easily hold the shield machine can slide penetration, the re-start penetrating this by shield machine In this case, it is possible to easily secure the water stoppage of the arrival port.

Further, the foamed urethane layer, the access openings by opening forming a Kagami斫Ri, after facing the front of the shield machine into the access openings, foamed urethane ring for filling in the front peripheral portion the filling space is formed by attaching a Jo of the frame, be formed by injecting filling the foamed urethane thereto, can be provided foamed urethane layer in accuracy and quality.

Furthermore, the forming the access openings onset foam urethane layer by blowing foamed c <br/> urethane on the wall inside the peripheral surface of the access openings, the access openings onset foam urethane layer and the shield machine <br /> while maintaining the close contact between the onset foam urethane layer, if the shield machine to slide penetration, if the irregularities or uneven surface occurs on the wall inside the peripheral surface of the access openings in which the Kagami斫Ri But, it is possible to ensure correct integer this by spraying the foamed <br/> urethane, and adhesion and water cut of more reliable access openings, and a smooth sliding of the shield machine.

[0019] Incidentally, with foamed urethane is easily available at low cost, a ring-shaped frame member for forming a filling space of foamed urethane, it can also be easily manufactured by using an inexpensive material Therefore, the water stopping structure can be installed economically.

According to the method of reaching the penetration of the shield machine according to the present invention, the outer peripheral portion of the tip of the shield machine is formed.
After forming the foam urethane layer, restarting penetration operation is performed while maintaining the close contact between the foamed urethane layer and the wall inside the peripheral surface of the access openings. Wherein such foamed urethane layer can be provided easily and quickly, also the foamed urethane layer, ensuring easy and stable water cut in close contact with the wall inside the circumferential surface by its elasticity and adhesion Therefore, it is possible to quickly and stably perform the re-entering operation of the shield machine while preventing water from flowing from the ground side.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention, that is, an embodiment, will be described below in detail with reference to the accompanying drawings. In this embodiment, as shown in FIG. 1, the tip of a shield excavator 12 is advanced into the side wall 11 of a reaching shaft 10 so that a shield tunnel 13 is formed.
The present invention employs the water stopping structure at the shaft reaching port and the reaching penetrating method of the shield excavator according to the present invention.

That is, according to this embodiment, for the reaching shaft 10, for example, an underground continuous wall method or the like is used before the shield excavator 12 approaches the shaft 10 as the excavation work proceeds. The inside of the side wall 11, which is formed as a concrete structure in a cylindrical shape up to a predetermined depth, is connected to the shield tunnel 1
3 is a work space formed underground by excavating to the depth at which it is installed, and this shaft 10 is also used as a shaft for starting to an adjacent construction section.

Further, according to this embodiment, before the shield machine 12 reaches the position close to the side wall 11 of the shaft 10,
As the reaching protection work, the improved ground 14 is created by applying a ground improvement method such as a high pressure injection method (CJG method) or a freezing method from the ground surface to the ground.

When the shield machine 12 reaches a position close to the side wall 11 while cutting the improved ground 14 formed, the shield machine 12 is temporarily stopped, and the side wall 11 positioned opposite to the reaching portion is stopped. Then, a reaching port 15 for penetrating and advancing the distal end portion of the shield machine 12 is formed in the side wall 11. In addition,
According to the reaching operation of the shield excavator 12, the shield excavator 12 is moved from the center of the cutter face 29 to the fish tail portion 40 so that the cutter face 29 on the front surface of the shield excavator 12 approaches the side wall 11 as close as possible. Are cut off and cut into the side wall 11 (see FIG. 2).

Prior to the mirror shaving, a water-stopping work may be supplemented from the ground surface or from inside the shield machine 12 by a chemical injection method, a freezing method, or the like, as needed, so that the mirror cutting operation is performed. In addition, it is possible to more reliably prevent water from flowing out through cracks and gaps generated during cutting of the improved ground 14. Further, the work of forming the improved ground 14 by the above ground improvement method is performed by the shield excavator 1.
After reaching the position near the side wall 11 of the shaft 10, the ground improvement method may be applied from the ground surface or from the inside of the shield machine 12.

On the other hand, the above-mentioned mirror shaving is performed by, for example, grounding a large number of core boring from a working space inside the shaft 10 along a locus drawn on the surface of the side wall 11 and representing a position around the arrival port 15. By drilling toward the mountain, the wall of the opening portion is cut off from the surrounding side wall 11, and thereafter, the wall located inside the cutout locus is scraped off using a breaker or the like. This is performed by forming the arrival port 15 as an opening.

Then, after performing the mirror shaving, as shown in FIG. 2, by removing the earth and sand at the reaching portion located between the tip end surface of the shield machine 12 and the side wall 11,
The front face of the shield machine 12 is made to face the opening 15 formed with an opening, and the work of providing the water stopping structure 20 at the shaft reaching port according to the present invention is performed.

That is, the water stopping structure 20 of this embodiment is
As shown in FIG. 3, the access openings onset foam urethane layer 22 formed on the wall inside the peripheral surface 21 of the access openings 15, the shield machine 1
Shield machine onset foam urethane layer 23 formed on the second distal outer peripheral portion
It is constituted by and.

[0029] In this case, access openings onset foam urethane layer 22 is issued
Since the urethane foam has an adhesive property to concrete, it can be easily formed along the wall surface 21 with an arbitrary thickness by spraying the urethane foam toward the wall surface 21. In the spraying operation, when forming the reaching port 15, the unevenness and unevenness generated on the peripheral surface 21 in the wall due to the drilling operation of a large number of core boring or the cutting operation using a breaker or the like. It is performed in such a way that it is adjusted.

Further, foamed urethane used in this example, a material comprising at least swellable, elasticity and adhesion, preferably, for example, air Light Form SF-20
0NF (trade name: Nisshinbo Industries Co., Ltd.) foamed magnification about 3
It can be used as about 0 times.

On the other hand, the shield machine onset foam urethane layer 23 is easily by injecting filling the filling space 35 two shot foaming urethane formed by a ring-shaped frame 24 attached to the distal end outer peripheral portion of the shield machine 12 Can be formed.

That is, as shown in FIGS. 4 and 5, the frame unit 25 is formed by welding a frame unit 25 consisting of an arcuate plate 27 divided into 16 parts in the circumferential direction, and welding angle iron to the inner circumferential surfaces of both ends in the circumferential direction. The connecting piece 26 formed as above is connected to each other by a bolt to form a ring shape, and by being connected in this way to a ring shape, the lip groove shape attached to the distal end side of each frame unit 25 is formed. The steel 28 will be continuous in the circumferential direction. Therefore, the frame body 24 is firmly fixed to the cutter face 29 on the front surface of the shield machine 12 through welding, the bracket 30 and the like, so that the arc-shaped plate 27 and the lip channel steel 28, the cutter face 29, and improved ground 14, is surrounded by a wall inside the peripheral surface 21 of the side wall 11, the filling space 35 for filling the foamed urethane will be formed in a ring shape (see FIG. 3).

Further, the frame 24, the outer peripheral plate 31 so as to contact the access openings onset foam urethane layer 22 of the wall inside circumferential surface 21, and side walls and an arcuate plate 27 is a cutter face 29 of the lip groove-shaped steel 28 11 is attached so as to protrude and extend to the inside of the arrival port 15 so as to cover the gap between the port 11 and the inside.

[0034] Then, the arcuate plates 27 of each frame unit 25, and advance the ball valve 32 is attached (see FIGS. 4 and 5), to which are connected the inlet valve 33 of foamed urethane (Figure by supplying the 3 reference) to foam urethane, quickly work to form a shield machine onset foam urethane <br/> emission layer 23 by filling the filling space 35 two shot foaming urethane tip outer peripheral portion of the shield machine 12 Can be done.

[0035] Here, injected foamed urethane, and foamed is injected into the filling space 35, the filling space 35 to fill with no gap, is further injected, the arcuate plate 27, the lip groove-shaped steel 28, is constrained to the foamed by filling space within 35 surrounded by the wall inside the peripheral surface 21 or the like, closing the filling space 35 by its elasticity. Further, since the foamed <br/> urethane having adhesion, the shield machine onset foam urethane layer 23, as well as firmly adhered to the wall inside the peripheral surface 21 of the side wall 11, between the cutter face 29 and side walls 11 Close gaps tightly.

With the installation work of the water stopping structure 20 of this embodiment performed as described above, the soil and sand in the chamber 37 of the shield machine 12 are removed, and the skin plate 36 is removed in the chamber 37. work for attaching the injection valve 34 for injecting a foamed urethane outer peripheral portion is made appropriate. In addition, this injection valve 3
4, the foamed urethane <br/> emission layer to complement a shield machine onset foam urethane layer 23, to further formed on an outer peripheral portion of the skin plate 36, to supplement injecting foamed urethane, restarting penetration described below It is used for work to more reliably prevent accidental flooding from the arrival port 15 during work.

According to this embodiment, after installing the water stopping structure 20, the shield machine 12 is advanced again so that at least the tip portion of the skin plate 36 penetrates the arrival port 15, and the arrival port 15 Perform a re-penetration operation to position it to be supported by the wall.

In such a penetrating operation, the shield machine 12 slides forward through the arrival port 15, but since the water stopping structure 20 of this embodiment is provided,
During such sliding, the shield machine onset foam urethane layer 23 with pressing the access openings <br/> onset foam urethane layer 22 formed on the wall inside the peripheral surface 21 of the access openings 15 by its elasticity, be provided with adhesion Thereby, the close contact state with the wall inner peripheral surface 21 is easily and firmly maintained. That is, according to this embodiment, by maintaining such a close contact state, the water stoppage of the arrival port 15 is reliably and stably secured, and the outflow of the groundwater or the outflow of the ground due to the eruption or the like during the re-entry operation. Can be easily prevented.

Note that the present invention is not limited to the embodiment of the above-described embodiment, and various forms can be adopted. For example, the inner peripheral surface 21 of the wall of the arrival port 15
Access openings onset foam urethane layer 22 formed is not necessarily provided, against the wall inside the peripheral surface 21 of the access openings 15 after the Kagami斫Ri directly contact sliding the shield machine onset foam urethane layer 23 The water stoppage can be ensured while moving.

[0040]

As described in detail above, the water blocking structure at the shaft entrance of the shield machine according to the present invention is a mirror cutting machine.
After finishing the installation, take along the outer periphery of the shield machine
To the filling space formed by the ring-shaped frame
By injecting filling urethane foam, so as to close contact with the wall inside the peripheral surface of the access openings, consists foamed urethane layer formed on the tip outer peripheral portion of the shield machine, economically and easily using inexpensive materials easily it is possible to install, by holding the close contact between the foamed urethane layer and the wall inside circumferential surface, a water outlet from the ground mountainside during restarting penetrate to ensure water-blocking of the access openings to the And it can be prevented stably.

According to the shield penetration machine reaching penetration method of the present invention, when the side wall of the shaft is mirror-cut and an opening is formed, the outer periphery of the front surface of the shield machine is taken out.
To the filling space formed by the ring-shaped frame
By injecting filling urethane foam, so as to close contact with the wall inside the peripheral surface of the access openings to form a foamed urethane layer on the tip outer peripheral portion of the shield machine, the wall body of the access openings This foamed urethane layer Since the shield machine is slid and penetrated through the arrival port while maintaining the close contact state with the peripheral surface, water repellency at the time of re-penetration and penetration is quickly ensured by a simple configuration, and a stable penetration from the arrival port is achieved. It is possible to easily and quickly perform the re-entry penetration work while preventing flooding.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a situation in which a shield machine reaches a shaft.

FIG. 2 is a cross-sectional view showing a configuration of a water stopping structure according to one embodiment of the present invention.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is a front view showing an example of a frame used when providing the water blocking structure of the present invention.

5 is a perspective view showing a frame unit constituting the frame shown in FIG. 4;

[Explanation of symbols]

10 the vertical shaft 11 side wall 12 shield machine 14 improved ground 15 reaches opening 20 water-shutoff structure 21 walls inside circumferential surface 22 reaches port onset foam urethane layer 23 excavator onset foam urethane layer (foamed urethane layer) 24 frame 29 cutter face 33 Injection valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-180473 (JP, A) JP-A-2-240397 (JP, A) JP-A 8-270373 (JP, A) JP-A 61-180373 221492 (JP, A) JP 6-31537 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 9/06 301

Claims (3)

(57) [Claims] 1. A stop for preventing groundwater from flowing into a shaft from the arrival port when the reached shield excavator penetrates into an opening port formed by mirror-cutting a shaft of a shaft. a water structure, so as to close contact with the wall inside peripheral surface of said access openings, wherein consists shield machine foamed urethane layer formed on the tip outer peripheral portion of the wall inside the circumferential surface and the foam urethane layer while maintaining close contact with, a said shield machine a water stop structure in a pit access openings of the sliding penetration to Resid Rudo excavator through the access openings, the seal
Urethane foam layer formed on the outer periphery of the tip of the machine
However, after the end of the mirror shaving, the outer peripheral portion of the front face of the shield machine is
Formed by a ring-shaped frame attached along the minute
By filling and filling urethane foam into the filling space
A shaft reaching port of a shield machine which is characterized by being formed
Water stop structure in The 2. A wall inside peripheral surface of said access openings, forming a access openings onset foam urethane layer by blowing foamed urethane <br/> Tan,該到our mouth onset foam urethane layer and the shield machine while maintaining the contact state between the <br/> onset foam urethane layer, in the pit access openings of the shield machine according to the shield machine to claim 1, characterized in that the slide penetrating through the access openings Water stop structure. 3. A reaching penetrating method for re-starting the reached shield excavator after mirror-cutting the side wall of the shaft and penetrating into an opening formed with an opening, wherein the reaching part of the shield excavator is provided. For the ground, before or after the shield machine reaches the reaching portion and stops, using a ground improvement method such as a chemical liquid injection method or a freezing method, a step of performing protection protection, and by opening forming the access openings to the Kagami斫Ri, a step for exposing a front surface of the shield machine is stopped to reach immediately before the pit sidewall by excavation work the access openings, the shield machine Before
With a ring-shaped frame attached along the outer periphery of the surface
Injecting and filling urethane foam into the formed filling space
Accordingly, the so as to close contact with the wall inside the peripheral surface of the access openings, forming a foamed urethane layer on the tip outer peripheral portion of the shield machine, the wall inside the circumferential surface of the foam urethane layer the access openings And a step of slidingly penetrating the shield machine through the access port while maintaining a close contact with the shield machine.