JP3453564B2 - Continuous construction method of tunnel block - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of continuously constructing a tunnel block, and more particularly to a method of continuously constructing an arch lining member made of precast concrete and an arch tunnel structure itself.

[0002]

2. Description of the Related Art One of the applicants has developed a horizontal pulling method using bearing balls as a friction reducing means as a rational laying method for precast concrete products such as box culverts (see Japanese Patent No. 2879021). ).

FIG. 8 is a schematic side view showing a horizontal pulling work state of a box culvert as an example of this laying method. As shown in the figure, a horizontal pulling rail 103 is laid on the basic concrete 101 constructed in the excavation tunnel 100 along the extension direction of the box culvert 102. As the horizontal pulling rail 103, FIG.
As shown in FIG. 3, a narrow width H-section steel or the like in which most of the portion is buried in the concrete 101 in the laid state is used. One side of the embedded H-section steel web 103a becomes a rail surface, and the flange 1 is slightly exposed at the end.
03b is the side wall. Furthermore, bearing balls 104 as spherical bodies for reducing friction are arranged on the rail surface so as to be dispersed appropriately. For example, a steel ball having a diameter of about 11 mm is used for the bearing ball 104. Above these bearing balls 104,
A box culvert 102 having a guide plate 105 made of a thick steel plate fixed to the bottom is placed. The box culvert 102 is point-supported by a large number of bearing balls 104 via a guide plate 105. As shown in FIG. 8, as the box culvert 102 is pulled in the arrow direction by a horizontal pulling (pulling) device such as a winch (not shown), the bearing balls 104 supporting the box culvert 102 roll. As a result, the dynamic friction between the guide plate 105 and the rail 103 is significantly reduced. According to the experiment, the dynamic friction coefficient is reduced to 1/4 as compared with the case of the horizontal pulling method such as warping. 8 and 9, the bearing ball 10
4 is enlarged and shown for explanation.

By the way, in the tunnel structure in which a large number of unit-width precast concrete members are connected in the extension direction, not only the box culvert having the above-mentioned rectangular cross section but also an arch-shaped lining member applied to the upper half arch portion and There is known a tunnel structure member made of precast concrete such as an arch tunnel, which is composed of both side wall portions and a vault (arch member) portion joined thereto.

FIG. 10 shows the construction of an arch-shaped lining member 150 made of precast concrete used to renew the deteriorated upper half arch portion 161 of the existing tunnel 160 (FIG. 10C). It is the explanatory view shown. The lining member 150 is an arch-shaped member made of precast reinforced concrete which is divided into two in the circumferential direction as shown in FIG.
The two members are connected via a bolt or the like at 50a, and the arch shape is held by a shape-maintaining jig 151 made of a steel frame. The lining member 150 is assembled outside the tunnel for several spans in the tunnel extension direction, and is suspended on the self-propelled assembly frame 152 that is waiting.
It is fixed on top and temporarily placed ((b) in the same figure). In this state, the assembly frame 152 is run to carry the lining member 150 to the construction position in the tunnel, and the lining member 150 is attached to the existing lining with an anchor or the like with a predetermined waterproofing inside. It is designed to be fixed to the inner surface.

Further, FIG. 11 is an explanatory view showing a construction condition of a new tunnel using the tunnel block 170 having an arch structure. In this tunnel block 170, a side wall block 172 made of precast concrete composed of a plurality of blocks of unit width is hung in an open-cut part where the basic concrete 171 is constructed, and a joint portion 172a at the top of the side wall block 172 is vaulted ( (Arch member) 173 is bolted to an end of the arch member) 173, and an invert 174 is further constructed with cast-in-place concrete to close the tunnel ring having the upper half arch. Closed ring-shaped tunnels consisting of this unit width (depth of 1 to 2 m) are sequentially assembled in the extension direction and connected at multiple points with bolts, and then the circumference of the tunnel is backfilled to construct a tunnel with a predetermined extension. Has become.

[0007]

By the way, in the arch-shaped lining work made of precast concrete described with reference to FIG. 10, the lining member placed on the traveling type mounting base is carried to the lining position in the tunnel,
Installation work is performed, and the empty assembly frame is moved to the outside of the tunnel again to repeat the loading of the next process. For this reason, since all the work such as loading and mounting of the lining is carried out by using the assembly stand, there is a problem that the work efficiency is poor as a whole because the carrying and assembling work cannot be carried out continuously.

Further, in the construction work of the tunnel having the upper half arch portion, since closed ring-shaped tunnels having a unit width are sequentially assembled and connected in the extension direction, the individual works cannot be continuously performed, resulting in the construction efficiency. However, there is a problem that a space for carrying in the structural member is required over the entire extension.

Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, and to efficiently carry in arch-shaped precast concrete members continuously to a predetermined position and then connect them, thereby significantly improving the construction efficiency. Another object is to provide an improved tunnel block continuous construction method.

[0010]

In order to achieve the above object, the present invention disperses spherical bodies on a rail surface laid on the top end face of a side wall concrete pre-constructed along the tunnel extension direction. Arranged, covering the upper half of the tunnel from the inside, the arch member of the precast concrete tunnel block assembled at the tunnel well, transferred to the connecting position of the arch member at the back of the tunnel while being supported by the spherical body, It is characterized in that the tunnel lining is continuously constructed by connecting with an already installed arch member.

Further, spherical bodies are dispersedly arranged on a rail surface laid on a foundation concrete preliminarily constructed along the tunnel extension direction, and the precast concrete side wall block is placed on the side wall block. The arch block and the closing ring having a tunnel shape formed by connecting the invert closing member are transferred to the closing ring connecting position while being supported by the spherical body, and are connected to the closing ring already installed. , Arch tunnels are constructed continuously.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for continuously constructing tunnel blocks according to the present invention will be described below with reference to the accompanying drawings. 1 to 4 are explanatory views showing a state of loading and assembling work of the arch-shaped lining member shown in FIG. 10 as an application example of continuous construction of a tunnel block.

The tunnel schematic longitudinal view of FIG. 1 partially shows the vicinity of the wellhead (I) and the inside of the tunnel (II, III) of the existing tunnel 10. In particular, inside the tunnel (II, III), a wall body 11 constructed along the inner side surface of the side wall (not shown) of the existing tunnel 10 is shown. This wall 11
Functions as a support member for a horizontal pulling rail 13 of the lining member 1 to be described later at the time of temporary installation, and is thereafter used as a side wall concrete 11 that supports the arch portion of the repair lining. For this reason, the horizontal rails 13 are provided on the tops of the side wall concrete 11 on both sides. The horizontal rail 13 has a sectional shape in which an H-shaped steel is placed horizontally like the one shown in FIG. 10, and the bearing balls 14 as spherical bodies for reducing friction are appropriately dispersed on the rail surface. Are arranged as follows. In the present embodiment, a steel ball having a diameter of about 11 mm is used as the bearing ball 14. The side wall concrete 11 is made of cast-in-place concrete, but a precast concrete member to which a rail for horizontal pulling can be attached may be assembled on site. It goes without saying that the tunnel to be applied may be a new lining for a new tunnel or a refurbished lining for an existing tunnel.

FIG. 2 shows the hanging of the lining member 1 on the assembly frame 20 in the vicinity of the tunnel wellhead (I), the assembly state, and the installation state of the protector 30 under the assembly frame 20. As shown in FIG. 2 (a), the assembly frame 20 is a stationary structure installed in a tunnel wellhead, and is a steel frame in which a pillar portion 22 and an arch frame portion 23 erected on the concrete foundation 12 are assembled. Consists of shoulders 24
Is a rail 1 for horizontal pulling on the side wall concrete 11 described above.
A rail (not shown) that is set to the same height as 3 and that communicates with the horizontal pulling rail 13 is provided. This allows
The arch lining member 1 assembled on the assembly stand 20 can be moved as it is onto the horizontal rail 13. In the present embodiment, as shown in FIG. 3B, the two-part arch lining members 1 connected at the arch top end are connected in two rows in the extension direction to form one unit for conveyance. A bolt (not shown) connects the arch top end and the arch lining members 1 adjacent to each other in the extension direction.

Further, a gate protector 30 is provided in the space below the assembly frame 20 so as not to block the traffic even when the lining member 1 is suspended and connected. As shown in FIG. 2 (a), the portal protector 30 is constructed by assembling shaped steel into a portal shape and covering the ceiling 32 and the side surface, and the inside of the tunnel 10 is covered by the tires 31 provided on the legs. It can move by self-propelled or towed.

FIG. 1 (II) shows the side wall concrete 1
1 shows a state in which the arch lining member 1 pulled out on the horizontal pulling rail 13 above 1 is pulled by a winch 9 (see FIG. 1) using a pulling wire W. At this time, although not shown, it is preferable to attach a fall prevention frame (not shown) to the arch lining member 1 so as to prevent the arch lining member 1 from falling during horizontal pulling. In the present embodiment, the winches 9 are each side wall concrete 11
It is installed in the back of the tunnel and the winches 9 on the left and right are driven in synchronization. The wire W is fixed near the lower end of the arch lining member 1 and is stretched over the side wall concrete 11.

At this time, as shown in FIGS. 1A and 1B, the portal protector 30 is arranged so that the portal protector 30 is always located below the archlining member 1 as the archlining member 1 is pulled and moved. Is preferably run. As a result, for example, as shown in FIG. 3A, the general vehicle C can be face-to-face traveling in the tunnel in parallel with the tunnel construction.

3A and 3B are explanatory views showing the positional relationship between the arch lining member 1 being pulled at the position (II) in FIG. 1 and the portal protector 30 located below the arch lining member 1. Since the arch of this embodiment has a small rise with respect to the span, a horizontal tie rod 5 is stretched over a part of the arch lining member 1. As a result, the arch shape can be maintained even when the arch lining member 1 is pulled.

4A and 4B are enlarged views of the leg portion 1a of the arch lining member 1 and the top end of the side wall concrete 11 portion on which the horizontal rail 13 is installed. Figure 4
FIG. 4A is a laterally pulled state of the arch lining member 1, and FIG. 4B is a state in which the arch lining member 1 is connected after being laterally pulled as shown in FIG. The space 17 between the bottom surface of the bottom slab and the side wall concrete is filled with mortar 18 to securely fix the arch lining member 1 on the side wall concrete 11. A seal member 19 is attached to the outer edge of the clearance so that the filling mortar 18 does not leak outside.

5 to 7 show, as an application example of continuous construction of tunnel blocks according to another embodiment, loading and assembling of the closing ring 40 by the tunnel block for constructing an arch tunnel as shown in FIG. It is the front view and side view which showed the state of work. In the present embodiment, FIG.
As shown in (a), a basic concrete 41 is laid in advance along the tunnel extension, and a horizontal rail is laid on the upper surface of the basic concrete 41 along the 13 tunnel extension direction. This horizontal rail 13 is
Similar to the one provided on the side wall concrete 11 in FIG. 1, it has a cross-sectional shape in which an H-shaped steel is laid horizontally, and an appropriate number of bearing balls 14 for reducing friction are dispersedly arranged on the rail surface.

FIG. 5 (a) shows the lateral pulling rails 13 on both sides.
The side wall blocks 42 are installed on the upper side, and the vault (arch member) 43 is joined at the joint portion 42 a at the top of the side wall blocks 42. Further side wall block 42
The closing ring 40 is shown with an invert closing temporary member 44 attached between them. On the bottom surface side of the side wall block 42, as shown in FIG.
A convex elongated guide plate 42b is formed on the bearing ball 14 in the recess.

As shown in FIG. 2B, the closing ring 40 is laterally pulled by a pulling wire W so that the closing ring 40 communicates with the extension direction at a predetermined position, and a continuous tunnel 50 as shown in FIG. Can be built. At this time, it is preferable that a fall prevention frame (not shown) is attached to the closing ring 40 so that the closing ring 40 does not fall down during lateral pulling.

FIGS. 6 and 7 are a sectional view and a partially enlarged view showing a modified example of tunnel construction by laterally pulling the closing ring shown in FIG. Also in the case of the spectacle-shaped double arch tunnel shown in FIG. 6, each side wall block 42, the middle wall block 45, and the vault 43 hung over each side wall block 42.
It is possible to integrally connect the invert closing temporary member 44 to form the closing ring 40, attach a pulling wire or the like to the leg portion of each block, and pull it horizontally on a horizontal pulling rail (not shown). . FIG. 7 is an enlarged partial enlarged view for explaining the configurations of the side wall block 42 and the middle wall block 45. As shown in the figure, the guide plate 42 formed on the bottom surface of each block 42, 45
On the foundation concrete 41 facing b, 45b, H
A horizontal pulling rail 13 having a sectional shape in which a shaped steel is horizontally placed is laid, and an appropriate number of bearing balls 14 are dispersedly arranged on the rail surface. Further, a grout injection hole 46 is formed in the block leg portion, and finally, in a state where the closing ring 40 is connected at a predetermined position, grout is performed, and a clearance 47 between the bottom surface of the block and the foundation concrete is closed and hardened. Tunnel 5 integrated over the entire grout
The load of 0 is transmitted to the foundation concrete 41.

[0024]

As described above, the arch member made of the precast concrete member can be continuously carried in by a simple structure and can be installed by connecting in the longitudinal direction, so that the construction efficiency can be remarkably improved. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional side view and a plan view of a tunnel shown for explaining an embodiment of a continuous construction method of tunnel blocks according to the present invention.

2A and 2B are a front view and a side view showing an assembled state of a lining member near a tunnel wellhead (I) shown in FIG.

3 is a front view and a side view showing a pulled state of the lining member in the tunnel pit (II) shown in FIG.

FIG. 4 is a partially enlarged view showing a configuration of a leg portion of the lining member shown in FIG.

FIG. 5 is a schematic vertical sectional side view and a front view of a tunnel shown for explaining another embodiment of the method for continuously constructing a tunnel block according to the present invention.

6 is a front view of a tunnel showing a modification of another embodiment of the continuous construction method of the tunnel block shown in FIG.

FIG. 7 is an enlarged front view showing the configuration of a horizontal pulling structure portion of the arch block shown in FIG.

FIG. 8 is a side view showing an example of conventional continuous pipe laying work.

9 is a partial front view showing an example of friction reducing means in continuous pipe laying work shown in FIG.

FIG. 10 is a construction state explanatory view showing an example of a conventional method of installing an arch lining member in a tunnel.

FIG. 11 is a construction state explanatory view showing an example of a conventional arch tunnel construction method.

[Explanation of symbols]

1 Arch lining member 10 tunnels 11 Sidewall concrete 12,41 Foundation concrete 13 Horizontal pulling rail 20 Assembly stand 30 protector 40 closing ring 42 Side wall block 43 vault 44 Temporary member for invert closing 45 Middle wall block

─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Ryusuke 3-12-8 Shibaura, Minato-ku, Tokyo Within Ando Construction Co., Ltd. (72) Inventor Yuichi Shiga 4-3-3 Shibaura, Minato-ku, Tokyo Geostar -Incorporated (72) Inventor Sadaichi Iwasaki 4-3 Shiba, Minato-ku, Tokyo Geostar Co., Ltd.-Inventor Takeshi Odaka 4 2-3 Shiba, Minato-ku, Tokyo Geostar Co., Ltd. (56) Reference JP-A-8-109645 (JP, A) JP-A-2000-186332 (JP, A) JP-A-2000-186331 (JP, A) JP-A-5-71159 (JP, A) Patent 2879021 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/08

Claims (2)

(57) [Claims] 1. A tunnel in which spherical bodies are dispersedly arranged on a rail surface laid on a top end surface of a side wall concrete pre-constructed along a tunnel extension direction to cover an upper half arch portion of the tunnel from the inside. The arch member of the precast concrete tunnel block assembled at the wellhead is transferred to the connecting position of the arch member at the back of the tunnel while being supported by the spherical body, and is connected with the already installed arch member to continue the tunnel lining. A method of continuously constructing tunnel blocks, characterized by constructing. 2. A rail surface laid on a foundation concrete pre-built along the tunnel extension direction,
Spherical bodies are arranged in a distributed manner, a precast concrete side wall block, an arch block mounted on the side wall block, and a tunnel-shaped closing ring formed by connecting an invert closing member with the spherical body. A method for continuously constructing a tunnel block, comprising transporting to a closed ring connection position in a supported state and connecting the closed ring already installed to continuously construct an arch tunnel.