JP2002250044A - Continuous construction method for tunnel block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently construct a precast concrete arch lining member and an arch tunnel structure itself. SOLUTION: Spherical bodies are dispersively arranged on the top end face of a side wall concrete 11 constructed in advance along the tunnel extension direction. An arch member 1 of a precast concrete tunnel block assembled at a tunnel pit port to cover a tunnel upper half arch section from the inside is shifted to the connection position of the arch member 1 at the tunnel depth in the supported state by the spherical bodies. The arch member 1 is connected to an already installed arch member 1 to continuously construct a tunnel lining.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously constructing a tunnel block, and more particularly to a method for 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 drawing method using bearing balls as friction reducing means as a rational method for laying precast concrete products such as box culverts (see Japanese Patent No. 2879021). ).

FIG. 8 is a schematic side view showing an example of a method of laying a box culvert in a horizontal pulling operation. As shown in FIG. 1, a horizontal pulling rail 103 is laid along a direction in which a box culvert 102 extends on a foundation concrete 101 constructed in an excavation tunnel 100. FIG. 9 shows the horizontal pulling rail 103.
As shown in FIG. 2, a narrow width H-section steel or the like whose most part is buried in the concrete 101 in a horizontal state is used. One side of the buried H-section steel web 103a is a rail surface, and the flange 1 is slightly exposed at the end.
03b is a side wall. Further, on the rail surface, bearing balls 104 as spherical bodies for reducing friction are arranged so as to be appropriately dispersed. For example, a steel ball having a diameter of about 11 mm is used for the bearing ball 104. On these bearing balls 104,
A box culvert 102 on which a guide plate 105 made of a thick steel plate is fixed is mounted on the bottom surface. The box culvert 102 is point-supported by a number of bearing balls 104 via a guide plate 105. As shown in FIG. 8, as the box culvert 102 is pulled in the direction of the arrow by a horizontal pulling device (not shown) such as a winch, the bearing balls 104 supporting the box culvert 102 roll. Thereby, the dynamic friction between the guide plate 105 and the rail 103 is greatly reduced. According to the experiment, the coefficient of kinetic friction is reduced to 1/4 as compared with the case of the horizontal drawing method such as warping. 8 and 9, the bearing ball 10
4 is enlarged for explanation.

By the way, not only a box culvert having a rectangular cross section as described above but also an arch-shaped lining member applied to an upper half arch portion is used in a tunnel structure formed by connecting a large number of precast concrete members having a unit width in an extending direction. There is known a tunnel structural member made of precast concrete, such as an arch tunnel, composed of side walls and a vault (arch member) portion joined thereon.

[0005] Each figure in Fig. 10 shows the construction status of a precast concrete arch-shaped lining member 150 used for renewing the deteriorated upper half arch portion 161 of the existing tunnel 160 (Fig. (C)). FIG. The lining member 150 is an arch-shaped member made of precast reinforced concrete divided into two parts in the circumferential direction as shown in FIG.
At 50a, the two members are connected via bolts or the like, and the arch shape is held by a shape-retaining jig 151 made of a steel frame. The lining member 150 is assembled for several spans in the tunnel extension direction outside the tunnel mine, and is suspended on a self-propelled assembling stand 152 which stands by.
It is fixed on the top and temporarily placed ((b) in the figure). In this state, the assembling pedestal 152 is moved to the position where the lining member 150 is installed in the tunnel, and the lining member 150 is fixed to the existing lining by using an anchor or the like with a predetermined waterproofing inside the existing lining. It is designed to be fixed to the inner surface.

FIG. 11 is an explanatory view showing a construction state of a new tunnel using the tunnel block 170 having an arch structure. In this tunnel block 170, a precast concrete side wall block 172 composed of a plurality of blocks having a unit width is hung in an excavated portion on which a foundation concrete 171 has been constructed, and further, a joint 172 a at the top of the side wall block 172 is vaulted ( The end of the arch member 173 is bolted, and an invert 174 is constructed with cast-in-place concrete to close the tunnel ring having the upper half arch. A closed ring-shaped tunnel having this unit width (depth: 1 to 2 m) is sequentially assembled in the extending direction, and a plurality of locations are connected by bolts. Thereafter, the periphery of the tunnel is backfilled to construct a tunnel of a predetermined extension. Has become.

[0007]

By the way, in the precast concrete arch-shaped lining work described with reference to FIG. 10, the lining member placed on the traveling assembly base is carried to the lining position in the tunnel,
The installation work is performed, and the empty assembly base is moved to the outside of the tunnel again, and the loading of the next process is repeated. For this reason, since all operations such as carrying in and lining are performed by using the assembling gantry, there is a problem that continuous transportation and assembling operations cannot be performed, resulting in poor work efficiency as a whole.

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

[0009] Therefore, an object of the present invention is to solve the problems of the above-mentioned prior art, and to improve the construction efficiency by carrying in an arch-shaped precast concrete member efficiently and continuously to a predetermined position and then connecting it. Another object of the present invention is to provide a method for continuously constructing a tunnel block, which is improved.

[0010]

In order to achieve the above object, the present invention disperses spherical bodies on a rail surface laid on the top end surface of a side wall concrete constructed in advance along a tunnel extending direction. Arrange, cover the upper half arch part of the tunnel from the inside, transfer the arch member of the precast concrete tunnel block assembled at the tunnel wellhead to the connection position of the arch member on the back of the tunnel while supported by the spherical body, It is characterized in that the tunnel lining is continuously constructed by connecting to the already installed arch member.

Further, the spherical bodies are dispersedly arranged on a rail surface laid on a foundation concrete constructed in advance along a tunnel extending direction, and a precast concrete side wall block is placed on the side wall block. The arch block and the closing ring in the form of a tunnel formed by connecting the invert closing member are transferred to the closing ring connecting position while being supported by the spherical body, and connected to the already installed closing ring. It is characterized by the continuous construction of arch tunnels.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for continuously constructing a tunnel block according to the present invention will be described below with reference to the accompanying drawings. FIGS. 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 the continuous construction of the tunnel block.

FIG. 1 is a schematic vertical sectional view of a portion of the tunnel 10 near the entrance of the existing tunnel 10 (I) and inside the tunnel (II, III). In particular, the inside of the tunnel (II, III) shows a wall 11 constructed along the inner surface of the side wall (not shown) of the existing tunnel 10. This wall 11
Functions as a support member for the later-described lateral pulling rail 13 of the lining member 1 at the time of temporary installation, and thereafter is used as a side wall concrete 11 for supporting an arch portion of the renovation lining. For this reason, rails 13 for horizontal pulling are provided on the top end of the side wall concrete 11 on both sides. The horizontal pulling rail 13 has a cross-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, steel balls having a diameter of about 11 mm are used for the bearing balls 14. Although the side wall concrete 11 is constructed by cast-in-place concrete, a precast concrete member to which a rail for horizontal drawing can be attached may be assembled on site. Needless to say, the applicable tunnel may be a new lining for a new tunnel or a modified lining of an existing tunnel.

FIG. 2 shows the hanging state of the lining member 1 on the assembling stand 20 near the tunnel entrance (I), the assembling state, and the setting state of the protector 30 below the assembling stand 20. As shown in FIG. 2A, the assembling pedestal 20 is a stationary structure installed at a tunnel entrance, and is a steel frame in which a pillar 22 and an arch frame 23 erected on the foundation concrete 12 are assembled. Consisting of shoulders 24
Is the rail 1 for lateral pulling on the side wall concrete 11 described above.
A rail (not shown) which is set at the same height as 3 and communicates with the horizontal pulling rail 13 is provided. This allows
The arch lining member 1 assembled on the assembly base 20 can be moved on the horizontal pulling rail 13 as it is. In the present embodiment, as shown in FIG. 2B, two divided 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. The arch top end and the arch lining member 1 adjacent in the extension direction are connected by bolts (not shown).

A portal protector 30 is provided in the space below the assembly stand 20 so that traffic is not interrupted even when the lining member 1 is suspended and connected. As shown in FIG. 2 (a), the portal protector 30 is formed by assembling a shaped steel into a portal and covers a ceiling 32 and side surfaces, and the inside of the tunnel 10 is provided by tires 31 provided on legs. It can move by self-propelled or towed.

FIG. 1 (II) shows a side wall concrete 1.
The drawing shows a state in which the arch lining member 1 pulled out on the horizontal pulling rail 13 above is pulled by the winch 9 (see FIG. 1) using the pulling wire W. At this time, although not shown, it is preferable that an overturn prevention frame (not shown) is attached to the arch lining member 1 to prevent the arch lining member 1 from overturning during lateral pulling. In the present embodiment, the winch 9 is provided on each side wall concrete 11.
And the right and left winches 9 are operated synchronously. Further, the wire W is fixed near the lower end of the arch lining member 1 and extends over the side wall concrete 11.

At this time, as shown in FIGS. 1A and 1B, the portal protector 30 is positioned so that the portal protector 30 is always located below the arch lining member 1 with the arch lining member 1 that is pulled and moved. Is preferably run. Thus, for example, as shown in FIG. 3A, the general vehicle C can travel in the tunnel in parallel with the tunnel construction.

FIG. 3 is an explanatory view showing the positional relationship between the arch lining member 1 pulled in the position (II) in FIG. 1 and the portal protector 30 located therebelow. Since the arch of the present embodiment has a small rise relative to the span, a horizontal tie rod 5 is stretched over a part of the arch lining member 1. Thus, the arch shape can be maintained even when the arch lining member 1 is pulled.

4A and 4B are enlarged views of the leg 1a of the arch lining member 1 and the top end of the side wall concrete 11 where the horizontal pulling rail 13 is installed. FIG.
FIG. 4A shows a state in which the arch lining member 1 is laterally pulled, and FIG. 4B shows a state in which the arch lining member 1 is connected after the horizontal drawing as shown in FIG. The mortar 18 is filled in the gap 17 between the bottom surface of the bottom slab and the side wall concrete, and the arch lining member 1 is securely fixed 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.

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

FIG. 5 (a) shows the horizontal pulling rails 13 on both sides.
A side wall block 42 is installed on each of the upper sides, and a vault (arch member) 43 is bonded at a bonding portion 42 a at the top of the side wall block 42. Further, the side wall block 42
A closing ring 40 with an invert closing temporary member 44 mounted therebetween is shown. On the bottom side of the side wall block 42, as shown in FIG.
A convex and 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 to connect at a predetermined position in the extending direction, thereby forming a continuous tunnel 50 as shown in FIG. Can be built. At this time, it is preferable to attach a fall prevention frame (not shown) to the closing ring 40 so that the closing ring 40 does not fall during the horizontal pull.

FIGS. 6 and 7 are a sectional view and a partially enlarged view showing a modification of the construction of the tunnel by the horizontal pulling operation of the closing ring shown in FIG. Also in the case of the glasses-shaped double arch tunnel shown in FIG. 6, each of the side wall blocks 42, the middle wall blocks 45, and the vaults 43 bridged over each of them.
And the invert closing temporary member 44 are integrally connected to form a closing ring 40, a pulling wire or the like is attached to the leg of each block, and it is possible to pull laterally on a horizontal pulling rail (not shown). . FIG. 7 is a partially enlarged view illustrating the configuration of the side wall block 42 and the middle wall block 45 in an enlarged manner. As shown in the figure, a guide plate 42 formed on the bottom surface of each block 42, 45
b, 45b on the foundation concrete 41
A horizontal pulling rail 13 having a cross section in which a shaped steel is placed horizontally 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, and grouting is performed in a state where the closing ring 40 is finally connected at a predetermined position, and the clearance 47 between the block bottom surface and the foundation concrete is closed and hardened. Tunnel 5 integrated over the entire grout
A load of 0 is transmitted to the foundation concrete 41.

[0024]

As described above, since arch members made of precast concrete members can be continuously carried in a simple structure and connected in the longitudinal direction and installed, the construction efficiency is greatly improved. It has the effect of being able to do so.

[Brief description of the drawings]

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

FIGS. 2A and 2B are a front view and a side view showing an assembled state of a lining member near a tunnel entrance (I) shown in FIG. 1;

FIG. 3 is a front view and a side view showing a towing state of the lining member in the tunnel pit (II) shown in FIG. 1;

FIG. 4 is a partially enlarged view showing a configuration of a leg of the lining member shown in FIG. 1;

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.

FIG. 6 is a front view of a tunnel showing a modification of another embodiment of the method of continuously constructing the tunnel blocks shown in FIG. 5;

FIG. 7 is an enlarged front view showing a configuration of a horizontal pulling structure portion of the arch block shown in FIG. 6;

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

9 is a partial front view showing an example of a friction reducing means in the continuous laying of the sewer shown in FIG. 8;

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arch lining member 10 Tunnel 11 Side wall concrete 12, 41 Foundation concrete 13 Lateral drawing rail 20 Assembly stand 30 Protector 40 Closing ring 42 Side wall block 43 Vault 44 Invert closing temporary member 45 Middle wall block

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masahiro Sawada 3-12-8 Shibaura, Minato-ku, Tokyo Ando Construction Co., Ltd. (72) Inventor Ryusuke 3-12-8 Shibaura, Minato-ku, Tokyo Ando Construction Inside (72) Inventor Yuichi Shiga 2-3-2 Shiba, Minato-ku, Tokyo Geostar Inc. (72) Inventor Tadashiro Iwasaki 2-3-2 Shiba, Minato-ku, Tokyo Geostar Inc. (72 Inventor Takeshi Odaka Takeshi F-term (reference) 2D055 BA07 BB02, 2-3 2-3 Shiba, Minato-ku, Tokyo

Claims (2)

[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 constructed in advance along a tunnel extending direction to cover an upper half arch portion of a tunnel from inside. The arch member of the precast concrete tunnel block assembled at the wellhead is transported to the connection position of the arch member at the back of the tunnel while being supported by the spherical body, and connected to the already installed arch member, and the tunnel lining is continuously performed. A method for continuously constructing a tunnel block, characterized by being constructed. 2. On a rail surface laid on a foundation concrete pre-constructed along the tunnel extension direction,
A spherical body is dispersed and arranged, and a precast concrete side wall block, an arch block placed on the side wall block, and a tunnel-shaped closing ring formed by connecting an invert closing member are formed by the spherical body. A method for continuously constructing a tunnel block, wherein the arched tunnel is continuously constructed while being supported and transported to a closing ring connection position, and connected to an already installed closing ring.