JP4408256B2 - How to build an arched rock shed - Google Patents

Description

The present invention, collapse of earth and sand to a method for the construction of arched Rokkushe' de covering protecting the traffic route against falling rocks or snow, and the like.

  In a traffic route provided in a mountainous area, a valley, or the like, there is a case where a lock shed that covers the traffic road is provided in order to protect people, vehicles, and the like against landslides, falling rocks, or snow damage. Since the rock shed receives a large impact due to falling rocks or the like, it requires high strength, and excellent impact resistance and buffering performance are desired.

  In a concrete-structured rock shed, there is a structure in which necessary pillars and the like are erected to form a support portion, both ends of beams and slabs are supported on this support portion, and a buffer material is placed thereon (for example, , See Patent Document 1).

  In such a rock shed, there is a problem in that it is necessary to block traffic for a long time on a traffic road because construction is mainly performed on site. Rock sheds using precast PC beams are preferable because they have high strength, high elasticity, and high resilience, and the traffic cut-off time may be shorter than when constructed with cast-in-place concrete. A technique for reducing this is desired.

  Further, there is a structural member made of a composite material having high strength, high toughness, high rigidity, and high torsional rigidity (see, for example, cited document 2).

This technology is a member of a two-layer integrated structure of steel and short fiber reinforced concrete. Short fiber reinforced concrete is concrete mixed with short fibers such as polyvinyl alcohol, polyethylene, and steel fibers.
Japanese Patent No. 2667101 (page 1-2, FIG. 1) JP 2003-41708 A (page 2-3, FIG. 1)

When building in the current field, high strength along with the traffic interruption time can be minimized, and developed an arcuate lock shed made of precast concrete member having a high impact resistance, that provides this.

  The present invention also provides a method for constructing a lock shed that uses such an arched lock shed and can minimize the traffic interruption time.

The present invention is configured by assembling an arc plate-shaped precast concrete member divided in the axial direction and the circumferential direction, and the member includes a plurality of rows of main steel pipes arranged in parallel in the circumferential direction and an axial auxiliary steel pipe penetrating the main steel tube row. built, but according to the circumferential direction adjacent member and a flange coupling portion to the coupling end of the, how to build a over terrain lock shed provided with a securable structures attached to and detached from the foundation coupling end of the underlying is there.

  The arc-shaped precast concrete member of the lock shed includes, for example, a segment piece that divides the arch into three parts, and the dimension of the segment piece in the lock shed axial direction is an appropriate dimension considering workability. The frame constituting the arc plate-like precast concrete member is a plurality of rows of curved main steel pipes, and is provided with a connecting flange or the like with an adjacent member at an end thereof. Moreover, the fixed structure fixed to a foundation so that attachment or detachment is possible is provided in the connection edge part with the foundation of this circular arc plate-shaped precast concrete member.

  In addition, this circular arc plate-shaped precast concrete member has a built-in auxiliary steel pipe penetrating the main steel pipe row laterally. Furthermore, it is preferable to incorporate a reinforcing bar that is welded and fixed to the surface of the main steel pipe and surrounds the main steel pipe group.

Moreover, if this circular arc plate-shaped precast concrete member is made of concrete using a high toughness composite cement-based material as the concrete, it is preferable because the pile has high strength, high impact resistance and high toughness.

  If a concave portion for filling the filler is provided in the joint portion of the auxiliary steel pipe with the adjacent member, it is easy to connect and assemble the seam in the axial direction of the lock shed and can be integrated with the adjacent member. For example, organic fiber mixed mortar may be used as the filler.

  The construction method of the arched rock shed according to the present invention is such that a rail is laid on both sides of a rock shed construction traffic road, and a gate-shaped supporter having an internal dimension that allows the vehicle to pass is placed on the rail in a movable manner. The arch-shaped lock shed is constructed by assembling the arch-shaped lock shed on the portal support.

  This portal support straddles the traffic road, and its internal dimensions are such that the vehicle can pass through, and the traffic blocking time can be kept to a minimum without blocking the traffic even during the construction of the lock shed. it can.

  In addition, a lock shed assembly position is provided at a position that does not obstruct vehicle traffic, the rail is extended to the assembly position, and an arched rock shed is freely assembled and assembled on the gate support at the lock shed assembly position. It is preferable that the gate-shaped supporter on which the three-dimensional object is placed is moved to the lock shed construction position and installed, so that the traffic blocking time can be further shortened.

As described above, the arched rock shed according to the present invention is composed of a combination of arc plate-like precast concrete members, and is easy to assemble and install, and has high strength and high impact resistance. Useful.

  According to the method of the present invention, when building a lock shed on site, the traffic interruption time can be kept to a minimum.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an arched lock shed according to the present invention , and FIG. 2 is a front view thereof.

As shown in FIG. 1 and FIG. 2, the arched rock shed 10 according to the present invention is formed by connecting arc plate-shaped precast concrete members 21, 22, and 23 divided in the circumferential direction to form an arch shape. Is connected to the foundations 31 and 32 and is independent. In FIG. 1 and FIG. 2, one leg is embedded and fixed on the foundation 31, and the other leg is detachably coupled to the foundation 32 via brackets 33 and 34. The lock shed 10 is configured by sequentially connecting the arch composed of the arc-shaped plate-shaped precast members 21, 22 and 23 to the preceding arch such as the arch composed of the members 21a, 22a and 23a adjacent in the lock shed axial direction.

  FIG. 3 shows a cross-sectional view of these precast concrete members 20 (21, 22, 23). Each of the precast concrete members 20 (21, 22, 23) has a built-in frame composed of a plurality of (four rows in FIG. 3) main steel pipes curved along the circumferential direction. Moreover, the auxiliary steel pipe 52 which penetrates the row | line | column of the main steel pipe 51 in the lock shed axial direction is incorporated.

  It is possible to easily manufacture the precast concrete member 20 in which the reinforcing bars 53 and the auxiliary reinforcing bars 54 that are welded at positions where they are in contact with the outer periphery of the main steel pipe 51 are attached, the concrete 55 is placed, and these are built in. it can. Since this precast concrete member 20 has an arch shape with the main steel pipe 51 as the main structure in the circumferential direction, it has high strength against external force applied by falling rocks, fallen objects, snow, etc., has excellent impact resistance, and has excellent performance as a rock shed. Have

  In FIG. 3, a high tough composite cement material may be used as the concrete 55. The high-toughness composite cement material is made of short fiber reinforced concrete. For example, the fiber diameter is about 600 μm × the fiber length is about 30 mm, the fiber diameter is about 40 μm × the fiber length is about 12 mm, the polyvinyl alcohol fiber or the fiber diameter is 12 μm. It is a concrete mixed with polyethylene fibers or the like of about x fiber length of about 12 mm. The arcuate plate-like precast concrete member 20 using this high toughness composite cement-based material has excellent high strength, and has both high toughness and high rigidity.

  Moreover, even if a high-toughness composite cementitious material is temporarily cracked, it disperses as microcracks and has the property of being restored by the elasticity of the steel after unloading. In addition, the main steel pipe 51 may be filled with concrete to improve the strength, and a town-receiving unbonded PC steel material may be installed for reinforcement. Moreover, the technique shown in FIG. 3 can also be applied to a slope collapse prevention measure.

  FIG. 4 is an explanatory view showing a joint portion between adjacent precast concrete members, for example, members 22 and 23. As shown in FIG. 4, the main steel pipe 51 includes a flange joint 62 at a joint portion 60 with a circumferentially adjacent member. The flange joint 62 can easily and firmly join the members when the lock shed is assembled.

Further, as shown in FIG. 5, a connecting end portion with the base 32 is provided with a structure that is detachably fixed to the base. In the example of FIG. 5, an example is shown in which a fixed metal member 35 having a female screw is embedded in the foundation 32, and the leg portion 37 of the precast concrete member 23 is fixed with a bolt 36 that is screwed into the female screw of the fixed metal member 35. ing. This is an example, and a structure using the bracket shown in FIGS. 1 and 2 and other known detachable fixing means can be used.

  FIG. 6 is an explanatory view showing the structure of the joint 70 between the adjacent members 21 and 21a in the lock seed axial direction. An opposing recess 71 is provided in which the ends of the auxiliary steel pipes 52 of the precast concrete members 21 and 21a are exposed, and the joint material 70 and the opposing recess 71 are filled and filled with a filler 72.

  Next, the construction method of the arched rock shed 10 of the present invention will be described with reference to FIG.

  Rails 43 are laid on both sides of the traffic path 45 where the arched rock shed 10 should be constructed. A portal support 41 is placed on the rail 43 via the wheel 42. The arc-shaped precast member 22 is placed and fixed on the portal support 41 via the support device 44, and the arc-shaped precast members 21 and 23 coupled thereto are combined, and the members are coupled to each other by the circumferential joint portion 60. To do.

  Next, the legs of the arched rock shed 10 are joined to the foundations 31 and 32. At the same time, the filler material is filled in the joint joint with the adjacent rock shed.

  When the fixing of the arched lock shed 10 is completed, the support device 44 is reduced, and the portal support 41 is moved to the next assembly position of the arched lock shed.

  By repeating the above, it is possible to construct the lock shed of the present invention without substantially blocking the traffic on the traffic road.

  Alternatively, the assembly position of the arch-shaped lock shed 10 may be provided at a position that does not hinder traffic on the traffic path 45, and the rail 43 may be extended to that position. Then, the arch-shaped lock shed 10 is assembled at the assembly position, and the portal support 41 on which the arch-shaped lock shed 10 is mounted is moved on the rail 43 by the wheels 42 and conveyed to the construction position of the lock shed 10 for installation. There are no restrictions on work facilities and places, and the traffic interruption time can be further shortened.

1 is a perspective view showing an arched rock shed according to the present invention . 1 is a front view showing an arched rock shed according to the present invention . It is sectional drawing of the member of the arched rock shed which concerns on this invention . It is explanatory drawing of the circumferential direction coupling | bond part of the member of the arched rock shed which concerns on this invention . It is explanatory drawing of the coupling | bond part with the foundation of the member of the arched rock shed which concerns on this invention . It is explanatory drawing of the axial direction coupling | bond part of the member of the arch-shaped lock shed which concerns on this invention .

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Arch-shaped rock shed 20, 21, 22, 23, 21a, 22a Arc plate-shaped precast concrete member 31, 32 Foundation 33, 34 Bracket 35 Fixed metal 36 Bolt 37 Leg 41 Portal support 42 Wheel 43 Rail 44 Support device 45 Traffic Road 51 Main Steel Pipe 52 Auxiliary Steel Pipe 53, 54 Reinforcement 55 Concrete 60 Circumferential Joint 61 Steel Pipe 62 Flange Joint 70 Joint 71 Recess 72 Filler

Claims (2)

Rail laying rails on both sides of the lock shed construction road, a gate-shaped supporter having internal dimensions that the vehicle can pass is placed on the rail to be movable, and an arch-shaped lock is placed on the gate-shaped supporter An arched rock shed construction method characterized by assembling a shed . 2. The method of constructing an arched rock shed according to claim 1 , wherein a lock shed assembly position is provided at a position that does not obstruct vehicle passage, and the rail is extended to the assembly position .

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