JP2784511B2 - Bagged concrete lining 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 bagging concrete lining method, and more particularly to a bagging concrete lining method suitable for excavating only a supporting portion of a tunnel ground.

[0002]

2. Description of the Related Art In a tunnel lining method as a prior art, a digging machine first excavates a ring-shaped or arch-shaped cross section in the ground, and then fills the excavated portion with concrete or covers. After constructing the outer shell of the tunnel by installing a body, the earth and sand inside the outer shell are excavated to complete the tunnel.

FIG. 16 is a partially sectional perspective view for explaining an example of a ring-shaped tunnel lining method. As shown in FIG. 16, the excavator 1 includes a ring excavation unit 2 in which cutters having relatively small diameters are arranged, and a work pit excavation unit 3 having a cutter having a relatively large diameter. The ring excavation portion 2 has inner and outer double skin plates 4 and 5, and the space between the skin plates 4 and 5 is excavated along with the excavation, and the excavated gap portion has a steel hollow inside the outer skin plate. The segments 6 are assembled in a duct shape, and then the concrete filling 7 is performed inside to construct the lining portion 8.

The working pit 9 has a diameter enough to allow a person to work inside, and is a work space necessary for construction such as carrying out excavated earth and sand, transporting and assembling segments for lining, placing concrete, and the like. After completion, it will be used for applications such as joint grooves. The hollow segment is filled with concrete or the steel lining is assembled around the working pit 9 in the same manner as the ring portion.

[0005] In this way, first, the lining portion 8 is set in advance to form the outer shell portion, and then the excavation work 1 of the ground in the outer shell portion is performed.
0 is performed to form a tunnel. In this case, the lining structure in the prior art is constructed by connecting existing portions called segments made of steel, reinforced concrete, or a composite structure of steel and concrete. In addition, there is also a technique in which concrete is cast directly between a ground in an excavated space and a formwork installed inside the excavated space to form a lining body, which is called an ECL method or an NTL method.

[0006]

In the above prior art, in the case of lining using a segment, between the ground and the lining body,
It is necessary to fill a gap corresponding to the thickness of the outer skin plate with a material such as mortar called a backfill material in order to prevent collapse of the ground, which requires a material and complicated construction time. Further, since a material such as mortar is directly injected into the ground, there is a problem that it is difficult to completely fill the ground.

[0007] In the case of the ECL method or the NTL method, a large inner formwork is required, and in addition, measures for treating the end of the formwork and ensuring the quality of concrete are required. Furthermore, in the case of the ECL method or the NTL method, the precision of concrete filling in the ground is inaccurate, and it has been difficult to ensure the quality of concrete in the ground with spring water. In addition,
Japanese Unexamined Patent Publication No. 59-228597 discloses that a toe behind an excavator is provided.
A water-permeable tube is placed along the inner peripheral wall of the
Fill lining material such as mortar or concrete,
Is pressed in the radial direction of the tunnel from the inside to perform dehydration.
First, the lining material was drained from the tube, and this drained
Depending on the lining material, the tube and the inner peripheral wall of the tunnel and the adjacent tube
It describes a tunnel lining method that joins the bushings. I
However, the method of this example flows out of the tube by pressing.
The mortar or concrete that has fallen around the excavator
And invading various parts of the work site and contaminating the underground environment
Problems.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and it is possible to simplify a construction process and construct a lining body in close contact with the ground with high accuracy, thereby shortening the construction period. And to provide a bagged concrete lining method capable of reducing costs.

[0009]

An object of the present invention is to use an excavator capable of excavating only a tunnel lining portion in a ground in advance.
Wherein arranged a bag-like band body gap portion caused by excavation of the excavator post section, row cormorants method der the lining of the tunnel by bagging Concrete pressurized圧打set concrete into the bag-like band body
Thus, the bag-shaped band is made up of only the moisture in the concrete.
With water permeability to pass through and pressurized inside
Contact between concrete and soil and groundwater
And only within the range of the bag while having a flexible structure
Characterized by the fact that it allows concrete to be cast
This is achieved by the bagging concrete lining method .
In addition, human can work inside the tunnel lining part
A working pit with a large diameter is arranged, and the lining of the working pit is
Do not use the bagged concrete or the bag-like band
The segment is used, and the above
It is characterized in that bagged concrete is used . In the tunnel lining section, a working pit having a diameter capable of being operated by a human is arranged, and the tunnel is used for the lining section excluding the working pit .
It is characterized by having a means for fixing the bagged concrete to be inserted and a lining portion of the work pit. Further , the excavator includes a pressurizing means for pressing the bagged concrete from outside the bag-like band.
Further, in place of the concrete in the above-described configuration of the present invention, the tunnel can be covered with a bagged mortar obtained by pressing mortar into a bag-like band.

[0010]

According to the above construction, kept in drilling only for lining the working face, it is possible to suppress loosening of the working face as much as possible, the complete bagging concrete lining body can be brought into close contact with the tunnel natural ground. Further, by pressurizing the Concrete Da設the bag, can dehydrate the unwanted water from the bag, further, by using the bag, pouring concrete and out flow that and, sediment and groundwater into the concrete Can be prevented from occurring. That is, from the bag
Only leaks water and concrete does not leak
To form dense concrete at an early stage
Leakage of concrete leaked from
To prevent deterioration of the underground environment due to concrete leakage.
Wear.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, only the case where concrete is used will be described, but the present invention is not limited to this, and the case where mortar is used instead of concrete is also within the scope of the present invention.

FIG. 1 is a perspective view showing one embodiment of a bag-filled concrete lining method of the present invention in a ring-shaped tunnel. In FIG. 1, in the method of the present embodiment, a ring-shaped excavator 30 is excavated in the ground, and after the excavation of a certain unit is completed, water permeability is applied to a groove-shaped and annular ground gap generated behind the excavator 30. An empty bag-like band (hereinafter, referred to as a bag) is provided, and a bag-filled concrete 31 in which concrete is pressured into the bag is constructed as a tunnel lining body.

The excavator 30 includes a ring 32 and a working shaft 33.
The excavation part for excavating the and is integrally formed in a ring shape. In the figure, the ring portion 32 is lined with the bagged concrete 31 and the lining body of the work pit 32 uses a steel segment 34. It may be. The excavator 30 moves forward by the reaction force of the shield jack 35. Although not shown in the drawing, the work pit 33 is provided with a device for discharging the excavated soil.

Further, this embodiment will be described in detail. FIG.
FIG. 2 is a perspective view of an excavator used in the embodiment of FIG. FIG.
As shown in the figure, the ring-shaped excavator 30 excavates only the ring-shaped lining part in the ground, and
6 and an inner skin plate 37 formed of a steel shell of a double skin plate, and in front of the steel shell, an excavated portion of a ring portion 32 provided with a relatively small-diameter cutter 38, and a relatively large-diameter cutter. And a digging part for digging a working pit 33 having a pit 39.

FIG. 3 is a sectional view of the ring portion 32 of FIG. As shown in FIG. 3, the rear part (tail part) of the excavator 30
A press ring 40 is attached to the shield jack 35, and the packed concrete 31 immediately after casting is pressed in the ground direction, whereby the moisture of the concrete is dehydrated through the water-permeable bag and hardened. In addition,
The press ring 40 can also advance the excavator in conjunction with the propulsion mechanism of the work pit 33.

FIG. 4 is a sectional view for explaining the procedure of the lining method for the bagged concrete according to the present embodiment.
As shown in (A), in the tail part 41 of the excavator 30,
A water-permeable bag 42 for placing concrete is placed in a ring-shaped void formed in front of the lining body of the existing bagged concrete 31 by excavation. Then, FIG.
As shown in (B), most of the concrete is poured into the bag 42 at the same time as the excavation, and as shown in FIG. It is possible to obtain the bagged concrete 31 (lining body) which is in close contact with the ground.

Next, FIG. 5 and FIG. 6 are explanatory views of the bag 42 used in the bagging concrete lining method of the present invention. The bag 42 shown in FIG. 5 has a shape corresponding to a ring portion between the adjacent work pits, and an end of the bag 42 is connected to a concrete transport pipe 44 disposed in the work pit via a concrete casting attachment pipe 43. A stopper 45 is provided in the concrete installation pipe 43 to control the concrete installation and installation. It should be noted that the concrete placing in the bag 42 is carried out by a concrete placing vehicle 4 for transporting and placing concrete in the existing tunnel.
4 can also be connected.

As shown in FIG. 6, the bag 42 can be provided with a spacer 46 corresponding to the lining thickness. Reference numeral 47 denotes sewing of a bag. As a material of the bag 42 having water permeability, a woven fabric having high tensile strength and excellent impact resistance made of synthetic fibers such as nylon and polyester is used. Any material can be used as long as it is resistant to water and permeable to concrete.

FIG. 7 is a sectional view showing a ring-shaped lining body made of bagged concrete constructed in the ground. The filled concrete 31a placed in the ring portion 32 and the filled concrete 31b placed in the work pit 33 come into contact with each other,
A ring-shaped lining is being constructed. In FIG. 1, the lining of the work pit is made of steel segments. However, as shown in FIG.
It goes without saying that b may be cast and used as a lining.
In this case, a fixing means 49 such as a planar fastener may be provided at the contact portion of each bag so that the position of the bag between the ring portion and the working well portion does not shift.

FIG. 8 is a diagram showing an excavation and removal operation of the ground in the outer shell portion. As shown in the figure, a ring-shaped lining body made of bagged concrete 31 is used as a tunnel outer shell portion. The tunnel 50 is completed by excavating and discharging the ground inside. For excavation in a tunnel, a hydraulic excavator and earth and sand transport equipment (not shown) are installed.

Next, another embodiment of the present invention will be described. FIG. 9 is a perspective view showing one embodiment of the bagged concrete lining method of the present invention in an arched tunnel. In FIG. 9, in the method of the present embodiment, an arch-shaped excavator 60 is excavated in the ground, and after completion of excavation of a certain unit, a water-permeable material is formed in a groove-shaped and arch-shaped ground space generated behind the excavator 60. An empty bag 42 having the following structure is provided, and a bag-filled concrete in which concrete is pressure-poured into the bag is constructed as a tunnel lining body.

The excavator 60 includes an arch portion 62 and a work shaft 33.
In the figure, the arch 62 and the work pit 33 are lined with bagged concretes 31a and 31b, respectively. In addition, the excavator 60
Is moved forward by the reaction force of the shield jack 35. In this embodiment, only the upper half of the tunnel is excavated in advance in an arch shape. A gripper 63 is provided at the excavation portion of the work pit 33, and the gripper 63 may take a reaction force.

Hereinafter, the operation procedure will be described assuming the construction example of this embodiment. (1) Outline of this construction example When considering a three-lane road tunnel to be constructed, the excavation width is approximately 17.0m to 20.0m and the excavation height is 13.5m to
It is 15.0 m, and the excavation cross section is about 200 m ² or more. In this method, when excavating a flat tunnel with a large cross section, the excavator excavates only the arched tunnel lining part first, and once the excavation of one lining length (about 1 m) is completed. A high-strength bag is disposed in a void formed at the rear of the excavator, and concrete is poured into the bag to form a lining body. In this method, a tunnel is constructed by excavating and excavating the remaining ground inside the arched outer shell surrounded by the lining body constructed in this way.

(2) Construction procedure of this method As shown in FIG. 10, an arch-shaped tunnel excavator 6
0 is the bagging concrete 31a, 3
1b is advanced by applying a propulsion reaction force. As shown in FIG. 11, when the propulsion of one lining length is completed, the press ring 40 is housed, and the space 65 of the lining part in the next process is secured. As shown in FIG.
Is arranged. As shown in FIG. 13, concrete is cast into the bag 42 using a concrete casting pipe 66. As shown in FIG. 14, after the concrete placement is completed,
The tunnel machine 60 is advanced again in the same manner as in the above steps. As shown in FIG.
The remaining soil 67 inside the area surrounded by 1b is excavated and discharged to complete the tunnel.

In the above description of some embodiments, the concrete packed in the lining portion of the arch portion or the ring portion other than the working pit and the concrete filled in the lining portion of the working pit are separate bodies. Although it is configured, for example, in the case of a tunnel having a relatively small diameter, the lining part of the working pit and the bags arranged in the lining part other than the working pit are connected to each other, and the cast concrete in both bags is removed. It is also possible to form an integrated lining.

As described above, according to several bagged concrete lining methods of the present invention, the following effects can be obtained. (1) The bag holds the internal pressure of the cast concrete, and has a dehydrating effect on the excess water of the concrete. (2) The poured concrete packed in the ground is restrained on all sides by the ground, the existing lining body, and the press ring, so that the internal pressure can be applied to the ground at an early stage in close contact with the ground. (3) Since concrete is poured into a bag, quality control and construction management of concrete are easy. (1) Improvement of concrete quality by pressure dehydration. (2) There is no deterioration in concrete quality due to collapse of the ground. (3) Since concrete is poured into the bag, there is no problem such as spilling of concrete. (4) Therefore, the inner mold frame may be a simple one that retains its shape. (5) No formwork is required at arches or rings other than the working pit. (6) When the shield is propelled, pressure is applied to the bagged concrete, so the concrete becomes compressed concrete.
It is conceivable that the strength is further increased.

[0027]

As described above, according to the present invention, loosening of the ground can be reduced as much as possible by providing bagged concrete in advance as a lining body or by applying internal pressure. In addition, the bag has water permeability, and unnecessary water is dehydrated by pressurizing the concrete in the bag, thereby improving the quality of the bag-filled concrete lining. Furthermore, by pouring concrete into the bag, it is possible to prevent the concrete from flowing out to unnecessary places and prevent contamination of earth and sand and groundwater, thereby ensuring quality. Further, it is possible to improve the troublesome work due to the heavy and rigid support material as in the prior art and the deterioration of the underground environment due to the leakage of concrete.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a ring-shaped tunnel of the bagged concrete lining method of the present invention.

FIG. 2 is a perspective view of an excavator used in the embodiment.

FIG. 3 is a sectional view of a ring portion of the present embodiment.

FIG. 4 is a cross-sectional view for explaining the procedure of the method of this embodiment.

FIG. 5 is an explanatory diagram of a bag used in the method of this embodiment.

FIG. 6 is an explanatory diagram of a bag used in the method of this embodiment.

FIG. 7 is a cross-sectional view showing a ring-shaped bagged concrete lining according to the present invention.

FIG. 8 is a diagram showing an excavation and removal operation of the ground inside the outer shell portion of the tunnel.

FIG. 9 is a perspective view showing one embodiment of an arched tunnel of the bagged concrete lining method of the present invention.

FIG. 10 is a sectional view for explaining a construction step of the embodiment in FIG. 9;

FIG. 11 is a sectional view for explaining a construction step of the embodiment in FIG. 9;

FIG. 12 is a cross-sectional view for explaining a construction step of the embodiment in FIG. 9;

FIG. 13 is a cross-sectional view for explaining a construction step of the embodiment in FIG. 9;

FIG. 14 is a cross-sectional view for explaining a construction step of the embodiment in FIG. 9;

FIG. 15 is a cross-sectional view for explaining a construction process of the embodiment in FIG. 9;

FIG. 16 is a partial cross-sectional perspective view for explaining a tunnel lining method in a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excavator 2 Ring excavation part 3 Work pit excavation part 4 Inner skin plate 5 Outer skin plate 6 Steel hollow segment 7 Concrete filling 8 Lining part 9 Work pit 10 Excavation work 30 Ring excavator 31, 31a, 31b Packing Concrete 32 Ring part 33 Work well 34 Steel segment 35 Shield jack 36 Outer skin plate 37 Inner skin plate 38, 39 Cutter 40 Press ring 41 Tail part 42 Bag 43 Concrete installation pipe 44 Concrete transport pipe 45 Stopper 46 Spacer 47 Sewing Including 48 Inner form 49 Fixing means 50 Tunnel 60 Excavator 62 Arch 63 Gripper 65 Space 66 Concrete casting pipe 67 Remaining soil

──────────────────────────────────────────────────続 き Continuing on the front page (73) Patent owner 000231198 Japan Land Development Co., Ltd. 4-9-1-9 Akasaka, Minato-ku, Tokyo (73) Patent owner 000236610 Fudo Construction Co., Ltd. Hirano-cho, Chuo-ku, Osaka-shi, Osaka Chome 2-16 (74) Attorney Tatsuyuki Unuma (73) Patent holder 000002118 Sumitomo Metal Industries Co., Ltd. 4-5-33 Kitahama, Chuo-ku, Osaka-shi, Osaka (73) Patent holder 000006208 Mitsubishi Heavy Industries, Ltd. 2-5-1 Marunouchi, Chiyoda-ku, Tokyo (73) Patentee 000000033 Asahi Kasei Kogyo Co., Ltd. 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Osaka (74) The above three patent attorneys Tatsuyuki Unuma (72) Inventor Masayuki Sadazuka 2-15-11 Higashi-Oizumi, Nerima-ku, Tokyo (72) Inventor Takahisa Ida 31 Ichibancho, Chiyoda-ku, Tokyo Kanitagumi Corporation East In-house (72) Inventor Kazuto Hamada 2-8-8 Koraku, Bunkyo-ku, Tokyo Within Goyo Construction Co., Ltd. (72) Inventor Masashi Kaneko 13-4 Arakicho, Shinjuku-ku, Tokyo Within Sumitomo Corporation (72) Inventor Sumio Toriumi 31st Ichibancho, Chiyoda-ku, Tokyo Zenitaka Gumi Tokyo Head Office (72) Inventor Yuji Asagami 1-16-14 Shibuya, Shibuya-ku, Tokyo Tokyu Construction Co., Ltd. (72) Invention Person Koji Ninomiya 4-9-9 Akasaka, Minato-ku, Tokyo Inside Japan Soil Development Co., Ltd. (72) Inventor Toshiaki Oku 2-1-1, Taito, Taito-ku, Tokyo Immovable Construction Co., Ltd.Examiner Toshiaki Nakamaki ( 56) References JP-A-5-239994 (JP, A) JP-A-59-228597 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/10 E21D 9/06 301

Claims (5)

(57) [Claims] 1. A land Yamauchi prior only tunnel lining section with excavation of the shield machine into the bag-like band body is disposed in the gap portion caused by excavation of the excavator post portion, the bag-shaped belt the lining of the tunnel by bagging concrete pressurized圧打set concrete into the body a row cormorants method, the bag-shaped belt body, that having a water permeability to pass only water in said concrete
Together, it and the concrete which has been pressurized圧打set in the inner portion, without the sediment and groundwater natural ground is in direct contact, and in which causes fastened only to Da設concrete within the bag, yet soft structure bag packed concrete lining method you said. 2. A lining method according to claim 1, the tunnel lining section, humans are arranged working pit workable diameter internally, the lining portion of the working pit, the Bagging
Concrete or segment that does not use the bag-like band body is used, a bag packed concrete lining method you wherein said bagging concrete be used in lining portion excluding the working pit. 3. The lining method according to claim 1, wherein the tunnel lining portion is provided with a working pit having a diameter capable of being worked inside by a human, and is used for the lining portion excluding the working pit. sacked concrete lining method and a means for fixing said bagging concrete, and a lining portion of the working pit. 4. A lining method according to claim 1, wherein the excavator is a bag you characterized by comprising a pressurizing means for pressurizing the bagging concrete from the outside of the bag-shaped belt member <br/> Concrete lining method. 5. A tunnel lining is performed by using a bagged mortar in which mortar is pressed into a bag-like band instead of concrete in the method according to any one of claims 1 to 4. Mortar lining method.