JP4524800B2 - Arch material for tunnel - Google Patents

Description

The present invention relates to an arch member used for construction of a tunnel, and more particularly to a lightened tunnel arch member.

Conventionally, there has been a construction in which a tunnel is constructed by horizontally placing a precast concrete arch member on a side wall. For example, a pair of left and right arc plate-shaped precast concrete plates are arched between both ends in the width direction of the bottom plate extending in the tunnel length direction and connected in the tunnel length direction. A side band that bulges upward at an appropriate distance from the outer surface of the leg part and extends in the tunnel length direction is provided integrally on the outside of the leg part of each precast concrete plate, and a pressure receiving member is provided between the side band and the leg part. There is disclosed a structure in which a leg portion is fastened to a side band by a fastening member such as a bolt, and embankment is applied so as to cover the concrete plate (Patent Document 1).
JP 7-21617 A

However, in the above-mentioned patent documents, since the arc-shaped precast concrete slab is heavy, there is a problem that transportation and installation are difficult, work man-hours increase, and cost increases. Such a problem is conspicuous in the tunnel structure with a large cross section because the arc-shaped precast concrete slab increases in size.

In view of the above problems, an object of the present invention is to provide a tunnel arch member capable of reducing the cost by facilitating the transportation and installation of the arch member.

In order to achieve the above object, the invention according to claim 1 is directed to a tunnel arch member made of precast concrete that is curved in an arch shape and is laid on a side wall that is installed on the ground. It is characterized by being.

The invention according to claim 1 is characterized in that the implant is hollow and a plurality of tubes are connected coaxially.

Further, the invention according to claim 2 is an arch member for a tunnel made of precast concrete curved in an arch shape that is horizontally mounted on a side wall installed on the ground, wherein the embedded body is embedded, and the embedded body Is hollow, and is configured by coaxially connecting a plurality of square tubes.

The invention according to claim 3 is characterized in that the embedded body is hollow and is constituted by a tube bent into an arch shape.

The invention according to claim 4 is characterized in that the embedded body is hollow and is formed of a steel pipe.

According to a fifth aspect of the present invention, there is provided a precast concrete tunnel arch member horizontally mounted on a side wall installed on the ground and curved in an arch shape. The embedded body is formed of a steel pipe bent into an arch shape, and the steel pipe includes a pair of flat steel and a pair of grooved steel so that the concrete does not flow into the inside.

According to the tunnel arch member according to claim 1 of the present invention, by embedding the embedded body, the tunnel arch member is made hollow to reduce the weight, and the tunnel arch member can be easily transported and installed. By reducing the cost, the cost can be reduced.

According to the tunnel arch member according to claim 1 , the plurality of pipes are coaxially connected to each other so that the embedded body is embedded in the entire circumferential direction of the tunnel arch member. It is possible to reduce the weight effectively.

Further, according to the tunnel arch member according to claim 2, when the width of the square tube is the same as the diameter of the tube, the cross-sectional area of the embedded body can be increased, so that a constant strength is maintained. However, the tunnel arch member can be efficiently reduced in weight.

Further, according to the tunnel arch member according to claim 3 , the implant can be integrated by being bent into an arch shape according to the curved shape of the arch member, When forming a tunnel arch member in a factory, the number of steps can be reduced and the cost can be reduced.

According to the tunnel arch member according to claim 4 , the strength of the tunnel arch member is improved and the reinforcement is arranged in the tunnel arch member because the embedded body is made of a steel pipe. Reinforcing bars can be simplified, and the cost can be reduced by simplifying the configuration of the tunnel arch member.

Further, according to the tunnel arch member according to claim 5 , the embedded body is formed of a steel pipe bent into an arch shape, and the steel pipe includes a pair of flat steel and a pair of slotted steel. By being constructed so as not to flow into the interior, the weight can be reduced and the strength of the tunnel arch member can be improved. Therefore, the reinforcing bars arranged in the tunnel arch member can be simplified, and the tunnel The cost can be reduced by simplifying the configuration of the arch member.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

A tunnel structure 1 shown in FIG. 1 includes a pair of left and right precast concrete L-shaped members 2 extending in the tunnel height direction from the bottom side of the tunnel, and a precast concrete tunnel horizontally mounted above the L-shaped member 2. Arch member 3 (hereinafter referred to as arch member). Further, between the L-shaped members 2, a central bottom slab portion 4 is formed by in-situ cast concrete.

The L-shaped member 2 includes a bottom portion 5 that contacts the ground G and a side wall portion 6 that is a side wall extending vertically from one end of the bottom portion 5 and is formed in advance at a factory. The side wall portion 6 is gently curved upward on the inner side, that is, toward the other end side of the bottom portion 5, and is formed at a height approximately in the middle of the height of the tunnel. Further, the L-shaped member 2 is provided with a vertical fastening insertion hole 7 for performing vertical fastening in the length direction of the tunnel.

The arch member 3 is a rectangular plate member having substantially the same thickness as the side wall portion 6 which is curved in the width direction of the tunnel so as to protrude upward, and is formed in advance at a factory. is there. The arch member 3 includes a joint portion 8 provided at one end in the circumferential direction and a top portion 9 provided at the other end. The arch members 3 are configured as a pair of left and right, and are arranged to face each other at the top end face and are arranged on the ceiling portion of the tunnel. Further, the arch member 3 is provided with a vertical fastening insertion hole 7 on the outer peripheral surface side for vertical fastening in the length direction of the tunnel. An embedded body 11 is embedded in the arch member 3, whereby the weight of the arch member 3 can be reduced.

The embedded body 11 is formed of, for example, a tube made of paper, cardboard, polystyrene foam, vinyl chloride, or the like and having a hollow inside. The diameter A of the tube which is the embedded body 11 is formed to be approximately half the length of the cross-sectional height H. Both ends of the embedded body 11 are closed by a lid member (not shown), and are held in a hollow state to prevent the inflow of concrete. This embedded body 11 is embedded over substantially the entire curved circumferential direction by connecting a plurality of tubes (in this case, four) coaxially and fixing them to a reinforcing bar (not shown). Can do.

Next, a method for constructing the tunnel structure 1 will be described.

First, the case where the L-shaped member 2 and the arch member 3 made of precast concrete are installed will be described. On the ground G which has been cut, a foundation 12 is laid with leveled concrete. After laying a mortar (not shown) on the foundation 12, the L-shaped member 2 is installed as a pair of left and right. Since the L-shaped member 2 is integrated with the bottom portion 5, it can stand on its own and workability can be improved. Next, one arch member 3 is placed on the side wall 6 of the L-shaped member 2 and connected to the side wall 6 at the joint 8. Similarly, the joint portion 8 of the other arch member 3 is connected to the upper end of the side wall portion 6 of the L-shaped member 2. Next, the pair of left and right arch members 3 are joined at the top 9. To join the pair of arch members 3, a PC steel rod is inserted into an insertion hole (not shown) penetrating perpendicularly to the top end face, and nuts screwed to both ends of the PC steel rod are tightened to tension the PC steel rod. Introduce power. Thereby, prestress which is tension in the left-right direction is introduced into the top portions 9 of the left and right arch members 3. The same operation is repeated in the length direction of the tunnel, and when a predetermined number, for example, 10 sets of the arch members 3 are installed, they are vertically tightened and integrated in the length direction of the tunnel. Although the vertical tightening is not shown, a PC steel rod is inserted into the vertical tightening insertion holes formed on the outer peripheral surface side of the arch member 3 and the L-shaped member 2, and nuts are screwed into both ends of the PC steel rod. This is done by introducing tension to the PC steel bar.

Next, the case where the center bottom plate | version | printing part 4 is nailed by the cast-in-place concrete to the said tunnel member installed in the field is demonstrated. The center bottom plate part 4 is constituted by a reinforcing bar (not shown) arranged between the bottom parts 5 of the L-shaped member 2 and a cast-in-place concrete, and the reinforcing bar and a reinforcing bar formed in advance on the bottom part 5 are formed. It is formed by placing concrete between the bottoms 5 of the L-shaped member 2 connected by mechanical joints (not shown) and joined with reinforcing bars.

Next, a modified example of the embedded body 11 will be described with reference to FIGS. The implant 11 shown in FIG. 3 is composed of a square tube. By doing so, when the width W of the square tube is the same as the diameter A of the tube, the cross-sectional area of the embedded body 11 can be increased, so that the arch member 3 can be efficiently reduced in weight. . Although not shown, it goes without saying that the corners are R-processed to avoid stress concentration.

In addition, the cross-sectional shape of the embedded body 11 is not limited to the circular shape or the quadrangular shape shown in FIG. 2 or FIG. 3, but may be configured by an elliptical shape, an oblong hole shape, a corrugated shape, a polygonal shape, or the like. Is possible.

FIG. 4 is a view showing another modification of the embedded body 11. The embedded body 11 shown in FIG. 4 is configured by bending into an arch shape. By doing so, since the embedded body 11 can be integrated, when the arch member 3 is formed in the factory, the number of steps can be reduced and the cost can be reduced.

Thus, the tunnel structure 1 according to the present embodiment is constituted by a plurality of divided precast concrete members, and by using the weight-reduced arch member 3, compared to a case where the tunnel structure 1 is constructed with cast-in-place concrete. This eliminates the need for formwork and dismantling, greatly reducing the work man-hours and greatly reducing costs. In addition, since the arch member 3 is light in weight and the tunnel structure 1 is composed of four parts, it can be easily formed in a factory, and can be easily transported and installed.

As described above, in the present embodiment, the arch member 3 is made of precast concrete curved in an arch shape and is placed on the side wall installed on the ground G, and the embedded body 11 is embedded. The cost can be reduced by making the member 3 hollow to reduce the weight and facilitating the transportation and installation of the arch member 3.

Further, since the embedded body 11 is hollow and is constituted by connecting a plurality of tubes coaxially, the embedded body 11 can be embedded over the entire circumferential direction of the arch member 3, The weight can be effectively reduced.

Further, since the embedded body 11 is hollow and is constituted by connecting a plurality of rectangular tubes coaxially, when the width W of the rectangular tube is the same as the diameter A of the tube, the cross-sectional area is increased. Therefore, the arch member 3 can be efficiently reduced in weight while maintaining a certain strength.

Further, since the embedded body 11 is hollow and is formed of a tube bent into an arch shape, the embedded body 11 can be integrated, and man-hours are required when forming the arch member 3 at the factory. The cost can be reduced.

Next, a second embodiment of the embedded body 15 will be described with reference to FIG. The embedded body 15 according to the present embodiment is made of a steel pipe, thereby improving the strength of the arch member 3, thereby reducing the number of reinforcing bars arranged in the arch member 3 and simplifying the configuration of the arch member 3. To reduce costs. The embedded body according to the present embodiment may be configured with a pipe-shaped member, but a steel pipe may be configured with a plurality of members. For example, the embedded body 15 shown in FIG. 5 includes a pair of flat steel 16 and a pair of grooved steel 17. The flat steel 16 and the groove steel 17 are respectively curved and formed in the same manner as the arch member 3. The flat steel 16 is arranged on the upper and lower sides, and the groove steel 17 is arranged on the left and right with respect to the flat steel 16. The section steel 17 is connected by welding. Both ends of the embedded body 15 configured in this way are closed by a lid member (not shown), and are held in a hollow state to prevent the inflow of concrete. Thus, by configuring the embedded body 15 with a steel member, the strength of the arch member 3 is improved, and the amount of reinforcing bars arranged in the arch member 3 can be reduced. The cost can be reduced by simplifying.

As described above, in the present embodiment, since the embedded body 15 is composed of a steel pipe composed of a pair of flat steel 16 and a pair of grooved steel 17, the strength of the arch member 3 is improved and the arch member 3 is improved. Reinforcing bars placed inside can be simplified, and the cost can be reduced by simplifying the configuration of the arch member 3.

Further, in the arch member 3 made of precast concrete which is horizontally mounted on the side wall installed on the ground G and curved in an arch shape, an embedded body 15 is embedded, and the embedded body 15 is formed in an arch shape. The steel pipe comprises a pair of flat steel 16 and a pair of groove steel 17 so that the concrete does not flow into the inside, so that the weight can be reduced and the strength of the arch member 3 can be reduced. Therefore, the reinforcing bars arranged in the arch member 3 can be simplified, and the cost can be reduced by simplifying the configuration of the arch member 3.

The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the above-described embodiments, the embedded body is hollow and the inside is driven. However, the present invention is not limited to this, and a solid member made of a lightweight material may be used. Good.

Moreover, although the above-mentioned Example demonstrated the case where an arch member was used for a tunnel structure, this invention is not restricted to this, You may use for an arch bridge.

It is a longitudinal cross-sectional view which shows the tunnel structure provided with the arch member which concerns on 1st Example of this invention. It is a longitudinal cross-sectional view of the arch member which concerns on 1st Example of this invention. It is a longitudinal cross-sectional view of the arch member which shows the modification based on 1st Example of this invention. It is a longitudinal cross-sectional view of the tunnel structure which shows another modification based on 1st Example of this invention. It is a longitudinal cross-sectional view of the arch member which concerns on 2nd Example of this invention.

3 Arch members
11 Implant G Ground

Claims (5)

In a tunnel arch member made of precast concrete, which is horizontally mounted on a side wall installed on the ground and curved in an arch shape, an embedded body is embedded, the embedded body is hollow, and a plurality of tunnel arch member, wherein Rukoto constructed by connecting a tube coaxially. It is laterally placed on the installed side walls on the ground, in an arch shape curved shaped precast concrete for tunnel arch member, and buried buried body, before Symbol Umakomitai is hollow, more arch member for being configured by connecting a corner tube coaxially and features that you belt tunnel. The buried body according to claim 1 or 2 for tunnel arch member according to characterized in that it is constituted by a molded tube bent into A over switch shape. The buried body for tunnel arch member according to claim 3, characterized in that it is constituted by a steel pipe. In a tunnel arch member made of precast concrete, which is horizontally mounted on a side wall installed on the ground and curved into an arch shape, an embedded body is embedded, and the embedded body is a steel pipe bent into an arch shape. A tunnel arch member characterized in that the steel pipe includes a pair of flat steel and a pair of slotted steel so that concrete does not flow into the interior.

Images