JP6464481B2 - Suspension anchor support method and suspension anchor support structure - Google Patents

Description

  The present invention relates to a suspension anchor support method and a suspension anchor support structure capable of reliably supporting a heavy object without affecting the durability of the tunnel.

  Conventionally, in tunnels, the durability of the tunnel is ensured by driving lining concrete.

  And in patent document 1, even if a wire rope is hung on the tile panel in a tunnel and the function of the anchor for panel support which makes the tunnel wall mounting structure of a tile panel deteriorates remarkably, a wire rope stops the fall of a panel. A fall prevention mechanism for the tunnel wall covering tile panel is described.

  Further, Patent Document 2 describes a hardware used when a secondary winding concrete is driven in a shield tunnel, and an anchor bolt of the hardware is screwed into a screw hole of a segment.

  Furthermore, Patent Document 3 describes a tunnel primary lining fitted with a tunnel suspension bar that does not impair the sealing function of the waterproof sheet even if it slides against the secondary lining concrete when an earthquake occurs. ing. Also in this patent document 3, the anchor rod is attached to the primary lining of the tunnel.

JP 2014-173323 A JP-A-10-306695 Japanese Utility Model Publication No. 6-26638

  Any of the conventional suspension anchors described above is for attaching a post-construction anchor to a lining body. Post-construction anchors are affected by the strength and surface condition of the base material, construction skill, anchor type, and the like.

  Furthermore, the tunnel lining is a structure for ensuring the durability of the tunnel. Therefore, if the post-construction anchor described above is embedded in the lining concrete and a heavy object such as a jet fan is supported, the durability of the tunnel may be impaired.

  The present invention has been made in view of the above, and provides a suspension anchor support method and a suspension anchor support structure that can reliably support heavy objects without affecting the durability of the tunnel. With the goal.

  In order to solve the above-described problems and achieve the object, a suspension anchor support method according to the present invention is a suspension anchor support method for suspending heavy objects placed in a tunnel, the inner wall of the tunnel being A supporting material for supporting the suspension anchor is provided on the outer periphery of the lining concrete to be poured into the lining concrete, and the lining concrete is driven in a state where the suspension anchor is supported by the supporting material.

  The suspension anchor supporting method according to the present invention is the above-described invention, wherein the suspension anchor is a U-shaped round steel, the support material is an H-shaped steel, and the U-shaped round steel is The bent portion is inserted into and engaged with a through hole formed in the H-shaped steel web.

  The suspension anchor supporting method according to the present invention is the above-described invention, wherein a waterproof sheet is provided on an outer surface of the lining concrete, and the lining concrete is provided at a boundary between the waterproof sheet and the lining concrete. A water stop rubber patch is provided on the side in a state where the suspension anchor penetrates.

  The suspension anchor supporting method according to the present invention is characterized in that, in the above invention, a water-expandable water stop ring is provided in the lining concrete so that the suspension anchor penetrates.

  The suspension anchor supporting method according to the present invention is the above-described invention, wherein an inspection window is provided in a portion where the suspension anchor is arranged, and at least the suspension anchor is supported by the support material. It changes to the inspection window dam plate which can be kept in a state, and then the lining concrete is driven.

  A suspension anchor support structure according to the present invention is a suspension anchor support structure for suspending heavy objects disposed in a tunnel, and the suspension anchor is supported on an outer periphery of lining concrete to be driven into the inner wall of the tunnel. A support material for supporting the anchor is provided, and the suspended anchor penetrates the lining concrete and protrudes into the tunnel.

  Moreover, the supporting structure of the suspension anchor concerning this invention is the above-mentioned invention. WHEREIN: The said suspension anchor is U-shaped round steel, The said support material is H-section steel, The said U-shaped round steel of The bent portion is inserted into and engaged with a through hole formed in the H-shaped steel web.

  The suspension anchor supporting structure according to the present invention is characterized in that, in the above invention, a waterproof sheet is provided on an outer surface of the lining concrete, and the lining concrete is provided at a boundary between the waterproof sheet and the lining concrete. A water stop rubber patch is provided on the side in a state where the suspension anchor penetrates.

  The suspension anchor support structure according to the present invention is characterized in that, in the above invention, a water-expandable water stop ring is provided in the lining concrete so that the suspension anchor penetrates.

  According to the present invention, a support material for supporting a suspension anchor is provided on the outer periphery of the lining concrete to be driven into the inner wall of the tunnel, and the lining concrete is cast in a state where the suspension anchor is supported by the support material. Therefore, the suspension anchor does not affect the durability of the tunnel and can reliably support a heavy object.

FIG. 1 is a cross-sectional view showing the structure of a tunnel provided with a suspension anchor according to an embodiment of the present invention. FIG. 2 is a plan view showing a coupled state of the suspension anchor shown in FIG. 1 and a jet fan supported by the suspension anchor. FIG. 3 is a left side view showing a coupled state of the suspension anchor shown in FIG. 1 and a jet fan supported by the suspension anchor. FIG. 4 is a cross-sectional view showing a detailed configuration in the vicinity of the suspension anchor. 5 is a cross-sectional view taken along line AA shown in FIG. FIG. 6 is an enlarged view of a portion B in FIG. FIG. 7 is an explanatory diagram for explaining a support method for the suspension anchor when the inspection window is provided at the attachment position of the suspension anchor. FIG. 8 is a view showing a configuration of the inspection window dam plate as seen from the inside of the tunnel in a state where the hanging metal fitting shown in FIG. 7 is incorporated.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

(overall structure)
FIG. 1 is a cross-sectional view showing a structure of a tunnel 1 provided with a suspension anchor 4 according to an embodiment of the present invention. FIG. 2 is a plan view showing a coupled state of the suspension anchor 4 shown in FIG. 1 and the jet fan 5 supported by the suspension anchor 4. Further, FIG. 3 is a left side view showing a coupling state of the suspension anchor 4 shown in FIG. 1 and the jet fan 5 supported by the suspension anchor 4.

  As shown in FIGS. 1 to 3, the tunnel 1 has a semicircular cross section. The lining concrete 3 is driven into the arch portion above the horizontal line of the road in the tunnel 1. The support material 2 is, for example, an H-shaped steel, and is provided in an arch shape around the covering concrete 3 so that the web stands in the radial direction. The suspension anchor 4 is supported by the support material 2 and penetrates the lining concrete 3 and protrudes into the tunnel 1. A suspension fitting 20 (see FIG. 4), which will be described later, is attached to the tip of the suspension anchor 4 protruding into the tunnel.

  As shown in FIG. 1, there are two jet fans 5 installed in the tunnel 1. As shown in FIGS. 2 and 3, the attachment positions P <b> 11 to P <b> 16 to which the six hanging brackets 20 are attached and the six attachment positions of the jet fan 5 are connected to one jet fan 5 by the six turnbuckles 6. The Further, in the other jet fan 5, the attachment positions P <b> 21 to P <b> 26 and the six attachment positions of the jet fan 5 are connected by the six turnbuckles 6.

(Detailed installation structure of hanging anchor)
FIG. 4 is a cross-sectional view showing a detailed configuration in the vicinity of the suspension anchor 4. FIG. 5 is a cross-sectional view taken along line AA shown in FIG. Further, FIG. 6 is an enlarged view of a portion B in FIG.

  As shown in FIG. 4, a through-hole 7 through which the suspension anchor 4 is inserted is formed in the H-shaped steel web 2 a that is the support material 2. Two suspension anchors 4 a and 4 b are provided at the attachment position of one suspension fitting 20. Therefore, two through holes 7a and 7b are formed in the web 2a corresponding to the two suspension anchors 4a and 4b. The two through holes 7a and 7b are formed at positions corresponding to the attachment positions of the suspension anchors 4a and 4b.

  As shown in FIG. 5, the suspension anchor 4 is a U-shaped stainless steel round steel. The bent portion side of the suspension anchor 4 is inserted into the through hole 7. On the other hand, both end portions of the suspension anchor 4 penetrate the lining concrete 3 and project into the tunnel 1. Both ends of the projecting anchor 4 are threaded.

  As shown in FIGS. 4 and 6, the through-hole 7 has a long diameter in a direction perpendicular to the surface of the lining concrete 3, so that the suspension anchor 4 can be easily inserted. In addition, the width of the through hole 7 in the direction horizontal to the surface of the lining concrete 3 is substantially the same as the diameter of the U-shaped stainless steel round bar with a predetermined clearance. In order to suppress the movement of the suspension anchor 4 in the through-hole 7, reinforcing members 8 and 9 are provided on the web and the flange, respectively.

  There are four ends of the suspension anchor 4 protruding from the lining concrete 3. Hanging metal fittings 20 for connecting the turnbuckle 6 and the suspension anchor 4 are installed at both ends. The suspension fitting 20 has holes corresponding to the four end portions, and the four end portions are inserted into the holes and fastened with the nuts 21. As shown in FIG. 5, the hanging metal fitting 20 has an inclined plate 20 a extending in the extending direction of the turnbuckle 6.

(Waterproof structure)
As shown in FIGS. 4 to 6, the outer surface of the lining concrete 3, that is , the side on which the support material 2 is provided is covered with a waterproof sheet 12. The suspension anchor 4 (4a, 4b) penetrates the waterproof sheet 12. For this reason, the waterproof rubber patch 10 (10a, 10b) is provided on the side of the lining concrete 3 at the boundary between the waterproof sheet 12 and the lining concrete 3 and with the suspension anchor 4 penetrating therethrough. As shown in FIG. 6, a water-swellable sealing material 13 is filled around the suspension anchor 4 surrounded by the waterstop rubber patch 10 and the waterproof sheet 12.

  As shown in FIGS. 4 and 5, a water-expandable water stop ring 11 (11 a, 11 b) is provided in the lining concrete 3 so as to penetrate the suspension anchor 4 (4 a, 4 b). Water transmitted through the suspension anchor 4 (4a, 4b) by the water-stopping rubber patch 10 (10a, 10b) including the water-expandable sealing material 13 and the water-expandable water-stopping ring 11 (11a, 11b). Infiltration can be suppressed.

  In addition, it is preferable that the lining concrete 3 in which the suspension anchor 4 is installed is not in the vicinity of the joint when the lining concrete 3 is driven. The position where the suspension anchor 4 is installed is particularly preferably the central portion between the seams when the lining concrete 3 is driven.

(Supporting method for suspension anchor)
In general, an inspection window is provided for compacting the lining concrete 3 and observing the driving condition of the lining concrete 3. Therefore, in this embodiment, as shown in FIG. 7, an inspection window 31 is provided at a position where the suspension anchor 4 is installed. The inspection window 31 can be opened and closed via a hinge having a rectangular shape and one end coupled by a pin 32. The inspection window 31 is open when the lining concrete 3 is compacted or observed.

  In the present embodiment, as shown in FIG. 7A, the suspension anchor 4 is attached to the support material 2, and the mold 30 is installed with the inspection window 31 open. Thereafter, the hinge pin 32 is pulled out and the inspection window 31 is removed.

  Further, as shown in FIG. 7 (b), the water-stopping rubber patch 10, the water-expandable water-stopping ring 11 and the like are arranged and attached to the suspension anchor 4. Thereafter, the suspension fitting 20 is inserted into the holes 20b (see FIG. 8) of the suspension fitting 20 with the both ends of the suspension anchor 4 protruding, and fixed by the nut 21. The Further, instead of the inspection window 31, an inspection window barrier plate 33 is attached. As shown in FIG. 8, the inspection window dam plate 33 is formed with a hole 33 a for incorporating the periphery of the hanging metal fitting 20. The inspection window barrier plate 33 is attached from the inside of the tunnel 1 by fitting the hanging metal fitting 20 into the hole 33a.

  Thereafter, the inspection window barrier plate 33 is fixed by the barrier plate fixing member 34. For example, as shown in FIG. 7B, the barrier plate fixing member 34 may be a single pipe, or may be fixed using a hinge and a cotter in the same manner as the inspection window 31. Good. Thereafter, the lining concrete 3 is driven.

  After the lining concrete 3 is driven, the inspection window dam plate 33 is removed, and the heavy jet fan 5 is suspended and supported through the turnbuckle 6 after an appropriate curing period, usually four weeks. In addition, when removing the inspection window barrier plate 33, the both ends of the suspension anchor 4 are driven with lining concrete in a state in which the suspension fitting 20 is fastened to the suspension anchor 4 by the nut 21.

  In the present embodiment, the suspension anchor 4 is not installed on the lining concrete 3 but on the support material 2 dedicated to the suspension anchor 4 provided separately. Even when an object is suspended, the durability of the tunnel 1 is not impaired.

Moreover, since the double water-stopping measure by the water-stop rubber patch 10 and the water-expandable water-stop ring 11 is applied, there is no water leakage and the durability of the tunnel 1 can be ensured. Moreover, since the suspension anchor 4 and the support material 2 do not have close contact like welding, the occurrence of corrosion and rust due to the difference in ionization tendency that is a concern among different metals can be suppressed.

  Furthermore, an inspection window is provided at a position where the suspension anchor 4 is arranged, and after the installation of the mold, while confirming the arrangement state of the suspension anchor 4 and the installation state of the water stop rubber patch 10 and the water-expandable water stop ring 11, Since the suspension anchor 4 can be arrange | positioned, the arrangement | positioning state of the suspension anchor 4 can be made reliable and favorable.

  In the present embodiment, the inspection window barrier plate 33 is attached after the suspension metal fitting 20 is attached to the suspension anchor 4, and then the lining concrete 3 is driven. The inspection window dam plate 33 may be fixed, and then the lining concrete 3 may be driven in, the inspection window dam plate 33 may be removed when the mold 30 is removed, and then the hanging metal fitting 20 may be attached to the suspension anchor 4.

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Supporting material 2a Web 3 Covering concrete 4, 4a, 4b Hanging anchor 5 Jet fan 6 Turn buckle 7, 7a, 7b Through-hole 8, 9 Reinforcement material 10, 10a, 10b Water-stop rubber patch 11, 11a, 11b Water-expandable water stop ring 12 Prevention sheet 13 Water-expandable sealant 20 Suspension bracket 20a Inclined plate 20b, 33a Hole 21 Nut 30 Mold 31 Inspection window 32 Pin 33 Inspection window weir plate 34 Dam plate fixing member

Claims (7)

A suspension anchor support method for suspending heavy objects placed in a tunnel,
Provide a support material to support the suspension anchor on the outer periphery of the lining concrete to be driven into the inner wall of the tunnel,
The hanging anchor is a U-shaped round steel,
The support material is H-section steel,
The bent portion of the U-shaped round steel is inserted into and engaged with a through-hole formed in the H-shaped steel web,
A method for supporting a suspension anchor, wherein the lining concrete is driven in a state where the suspension anchor is supported by the support material. A waterproof sheet is provided on the outer surface of the lining concrete,
Wherein the lining concrete side at the boundary between the waterproofing sheet and the lining concrete, the support method of hanging anchor according to claim 1, wherein the suspension anchor is characterized in that a water stop rubber patch while penetrating. The suspension anchor supporting method according to claim 1 or 2 , wherein a water-expandable water stop ring is provided in the lining concrete so that the suspension anchor penetrates. An inspection window is provided in a portion where the suspension anchor is arranged, and the inspection window is replaced with an inspection window barrier plate that can hold at least the suspension anchor supported by the support material, and then the lining concrete is The suspension anchor support method according to any one of claims 1 to 3 , wherein the anchor is driven. A suspension anchor support structure for suspending heavy objects placed in a tunnel,
Provide a support material to support the suspension anchor on the outer periphery of the lining concrete to be driven into the inner wall of the tunnel,
The hanging anchor is a U-shaped round steel,
The support material is H-section steel,
The bent portion of the U-shaped round steel is inserted into and engaged with a through-hole formed in the H-shaped steel web,
The suspension anchor supporting structure, wherein the suspension anchor penetrates the lining concrete and protrudes into the tunnel. A waterproof sheet is provided on the outer surface of the lining concrete,
The suspension anchor support structure according to claim 5 , wherein a waterproof rubber patch is provided on the lining concrete side at a boundary between the waterproof sheet and the lining concrete so that the suspension anchor penetrates. The suspension anchor support structure according to claim 5 or 6 , wherein a water-expandable water stop ring is provided in the lining concrete so that the suspension anchor penetrates.

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