JP4386798B2 - Curing method and curing device for tunnel lining concrete - Google Patents

Description

  The present invention relates to a curing method and curing apparatus for tunnel lining concrete, and more specifically, tunnel lining concrete capable of efficiently curing tunnel lining concrete after demolding without hindering the progress of tunnel excavation work. The present invention relates to a curing method and a curing apparatus.

  Currently, the Natom method is widely used for tunnel excavation work. An example of the Natom method is as follows. While digging a tunnel with an excavator, concrete is sprayed on the inner wall after digging, then anchor bolts are driven into the inner wall, and concrete is sprayed again to hold and fix the inner wall. After that, a waterproof sheet is put on the inner wall, a mold is attached, and lining concrete is placed between the inner wall and the mold. The thickness of sprayed concrete is about 10 cm, and the thickness of lining concrete is about 30 cm.

  The NATOM method is safe and efficient because the tunnel excavation work and the wall holding and fixing work can be performed in parallel.

  However, after moisture is removed from the surface of the lining concrete after removing the formwork, cracks are generated. In order to prevent this, it is necessary to cure for a predetermined period.

  If it is a flat concrete surface, it can be cured by covering it with a vinyl sheet or the like, but in the case of a tunnel wall surface, it is difficult to cure in this way. In addition, excavation work is being carried out at the tunnel tip, and vehicles for transporting earth and sand generated by excavation to the outside of the tunnel come and go through the section where lining concrete that requires curing is placed. There are many restrictions on construction time and space.

As a curing device for tunnel lining concrete, on the work carriage that can move in the tunnel, the water spray pipe formed along the arch shape of the tunnel is moved in the tunnel longitudinal direction along the guide on the carriage, The thing which sprinkles water on tunnel lining concrete is proposed (refer patent document 1). In this proposal, since the apparatus is large and complicated, a large space is required, and the inside of the tunnel becomes narrow, which causes troubles in carrying out excavated earth and sand and materials in and out. In addition, it is difficult to adjust the position of the water spray pipe so as to follow the arch shape of the tunnel for each tunnel, and there is a problem that work is troublesome. As described above, it has been difficult for the conventional apparatus to efficiently cure the tunnel lining concrete without hindering the progress of tunnel excavation.
JP 2001-248398 A

  An object of the present invention is to provide a method and apparatus capable of curing tunnel lining concrete efficiently without hindering the progress of tunnel excavation work.

  In order to achieve the above object, the tunnel lining concrete curing method of the present invention is a tunnel lining concrete curing method in which a curing liquid is sprayed on the surface of the tunnel lining concrete after demolding to cure the concrete. An arch-shaped spray arm having a spray nozzle is attached to the tip of the movable boom of the self-propelled traveling body, along the surface of the lining concrete, and the curing liquid is applied from the spray nozzle to the lining concrete surface. While spraying, the self-propelled traveling body is moved toward one side of the tunnel width direction and moved in the tunnel longitudinal direction to moisturize and cure the surface of the lining concrete.

  The tunnel lining concrete curing device of the present invention is a tunnel lining concrete curing device that sprays a curing liquid on the surface of the tunnel lining concrete after demolding to cure the concrete. A traveling body, a movable boom provided on the traveling body, an arch-shaped spray that is rotatably attached to the tip of the movable boom, has a spray nozzle, and is connected to a curing liquid supply source And an arm.

  According to the curing method for tunnel lining concrete of the present invention, an arch-shaped spray arm having a spray nozzle is attached to the tip of a movable boom of a self-propelled traveling body, and is placed along the surface of the lining concrete. Since the curing liquid is sprayed on the surface of the lining concrete, the curing liquid can be sprayed on the surface of the lining concrete without any gaps, so that efficient curing can be achieved.

  Also, while spraying the curing liquid from the spray nozzle onto the lining concrete surface, the self-propelled traveling body is moved toward the tunnel width direction and moved in the tunnel longitudinal direction, so that the space on the other side of the tunnel width direction is always excavated. It can be used as an unloading path for earth and sand, etc. by construction, and does not hinder the progress of tunnel excavation work.

  According to the tunnel lining concrete curing device of the present invention, it has a self-propelled traveling body, a movable boom provided on the self-propelled traveling body, and a spray nozzle, and is rotatably attached to the tip of the movable boom. Since the arch-shaped spray arm connected to the curing liquid supply source is provided, the curing liquid is sprayed from the spray nozzle along the surface of the lining concrete so that there is no gap on the surface of the lining concrete. Can be moisturized by spraying, enabling efficient curing.

  In addition, while spraying the curing liquid from the spray nozzle onto the lining concrete surface, the self-propelled traveling body can be moved toward the tunnel width direction and moved in the tunnel longitudinal direction, so the space on the other side of the tunnel width direction can be increased. It can always be used as a carrying-out path for earth and sand, etc. by excavation work, and does not hinder the progress of tunnel excavation work.

  Hereinafter, the curing method and curing apparatus for tunnel lining concrete of the present invention will be described based on the embodiments shown in the drawings.

  As shown in FIG. 8, in the tunnel excavation work, the excavation work at the tip of the tunnel 1, the lining concrete placement work in the section where the excavation work is completed, the lining concrete placement work is finished, and the concrete type Curing construction of lining concrete in the section where the frame is removed is performed in parallel.

  The earth and sand D generated by the excavation work is carried out from the excavation work section A at the tip of the tunnel 1 to the outside of the tunnel 1 through a lining concrete placing work section B and a lining concrete curing work section C by a truck or the like. In addition, construction materials and equipment are carried into and out of each construction section A, B, and C. Therefore, a construction truck or the like frequently travels in the lining concrete curing construction section C.

  3 and 4 show an example of the lining concrete curing device 2 of the present invention. This curing device 2 has a spray arm 5 attached to the tip of a boom 4 of a general backhoe 3. The backhoe 3 is provided with a curing water tank 6 and a spray pump 7, and water is supplied to the spray arm 5 by the spray pump 7 through a water supply pipe (not shown) for supplying water from the curing water tank 6.

  A plurality of spray units 9 are connected to the spray arm 5 in the longitudinal direction, and can be rotated around the respective connecting links 11 by a spray unit hydraulic cylinder 10. Each spray unit 9 is provided with a spray nozzle 12. The spray arm 5 is rotatable with respect to the boom 4 of the backhoe 3 by a spray arm hydraulic cylinder 8.

  FIG. 1 shows a curing method using the curing apparatus 2 of the present invention in a longitudinal sectional view in the width direction of a tunnel 1. A plurality of spraying units 9 constituting the spraying arm 5 mounted on the boom 4 of the backhoe 3 are rotated about the connecting link 11 by the spraying unit hydraulic cylinder 10, so that the spraying arm 5 becomes the surface of the lining concrete 14. It is formed in an arch shape along. Then, the spray arm 5 is rotated by the spray arm hydraulic cylinder 8 to move the boom 4 of the backhoe 3 so as to cover more than one half of the surface of the lining concrete 14 in the tunnel width direction. Close to the surface. In this state, the curing device 2 travels in the tunnel longitudinal direction while approaching one side in the tunnel width direction while spraying water W from the spray nozzle 12 of the spray arm 5. Thereby, the water W can be sprayed to the range more than half of one side with respect to the tunnel width direction of the lining concrete 14 simultaneously.

  This curing method is shown in FIG. 2 in a cross-sectional view in the tunnel plane direction. The curing device 2 advances in the longitudinal direction of the tunnel while spraying water W while moving the curing construction section C toward one side of the tunnel width direction, turns and returns to the other end of the curing construction section C while moving toward the tip of the curing construction section C. Come. Thus, by reciprocating the curing construction section C once (one cycle), the surface of the lining concrete 14 in the curing construction section C is sprayed with water W, and the surface is moisturized. In addition to the water W, a concrete curing agent can be used as the curing liquid to be sprayed.

  This curing construction varies depending on the environment such as the humidity in the tunnel 1. For example, one cycle of spraying water while traveling in a curing construction section C having a length of 70 m at a traveling speed of about 1 to 4 m / min. Curing is repeated every 6 hours, and after demolding, it is continued for at least 3 days, preferably about 1 week. By this curing work, the tunnel lining concrete 14 is cured so that the surface does not dry rapidly after demolding and is kept moist and does not crack.

  In this method, since the curing device 2 reciprocates in the longitudinal direction toward one side in the tunnel width direction, a carry-in / out path space S can always be secured on the other side in the width direction as shown in FIG. Unloading of earth and sand generated by excavation work, and loading / unloading of materials and equipment to / from each construction section are performed through the unloading / intake path space S, so that there is no problem in the progress of tunnel excavation work.

  In other words, in the present invention, one side of the tunnel width direction is a curing construction area of the lining concrete 14, and the other side is a loading / unloading area for earth and sand or materials.

  As shown in FIG. 5, the spray arm 5 is formed in an arch shape along the surface of the lining concrete 14 by rotating and moving each spray unit 9 around the connecting link 11, so that there is no gap on the surface of the lining concrete 14. W can be sprayed and efficient curing is possible. Since the arch shape of the spray arm 5 can be expanded and contracted, it can correspond to the tunnel 1 having various sizes and shapes.

  Further, the spray arm 5 can be stored in a small size as shown in FIG. 6 by rotating the spray unit 9 by the spray unit hydraulic cylinder 10 from the expanded state shown in FIG. Accordingly, when the curing device 2 is transported or not sprayed at the construction site, the curing device 2 can be easily stored and can be moved easily.

  The distance between the spray nozzle 12 of the spray arm 5 and the surface of the lining concrete 14 to be sprayed can be controlled so as to always maintain a predetermined distance by using a laser type distance measuring device or the like. Further, the spray nozzle 12 may be movable to control the spray direction. An air nozzle may be provided close to the spray nozzle 12 so that the spray direction is changed by the air ejected from the air nozzle.

  When there is no truck or the like that goes through the curing construction section C, the entire range in the tunnel width direction on the surface of the lining concrete 14 of the tunnel can be obtained by attaching extended spray units 13 that extend to both ends of the spray unit 9 as shown in FIG. Can also be covered. In this case, one cycle of curing can be performed by causing the curing device 2 to advance in the tunnel longitudinal direction in one direction in the tunnel longitudinal direction.

  Since this curing device 2 uses the existing backhoe 3, the cost can be greatly reduced, and the lower traveling body of the backhoe 3 can turn on the spot, so that it is possible to make a small turn even in the narrow tunnel 1. The efficiency of curing construction can be improved.

  In addition, in this embodiment, although the backhoe 3 is utilized for the curing apparatus 2, not only the backhoe 3 but another self-propelled traveling body can be used. Moreover, you may make it install in another place, without equip | installing the curing water tank 6 and the spraying pump 7 in the backhoe 3. FIG.

It is a tunnel width direction longitudinal cross-sectional view which shows the curing method by the curing apparatus of this invention. It is a tunnel plane direction cross-sectional view which shows the curing method by the curing apparatus of this invention. It is a front view which shows an example of the curing apparatus of this invention. FIG. 4 is a side view of FIG. 3. It is a front view which shows the state which expanded the spray arm which concerns on this invention. It is a front view which shows the state which stored the spray arm of FIG. It is a front view which shows the state which attached the extended spray unit to the spray arm of the curing apparatus of this invention. It is a tunnel plane direction cross-sectional view which illustrates typically the condition of the whole excavation site of a tunnel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Curing apparatus 3 Backhoe 4 Boom 5 Spraying arm 6 Curing water tank 7 Spraying pump 8 Spraying arm hydraulic cylinder 9 Spraying unit 10 Spraying unit hydraulic cylinder 11 Connecting link 12 Spraying nozzle 13 Extended spraying unit 14 Covering concrete

Claims (7)

A tunnel lining concrete curing method for curing the concrete by spraying a curing liquid on the surface of the tunnel lining concrete after demolding,
An arch-shaped spray arm having a spray nozzle is attached to the tip of the movable boom of the self-propelled traveling body, and the curing liquid is sprayed from the spray nozzle onto the lining concrete surface along the lining concrete surface. A method for curing tunnel lining concrete in which the self-propelled traveling body is moved toward one side of the tunnel width direction and moved in the tunnel longitudinal direction to moisturize and cure the surface of the lining concrete.   The tunnel lining concrete curing method according to claim 1, wherein the curing liquid is sprayed in a range of half or more on one side simultaneously with respect to the tunnel width direction of the lining concrete.   The method for curing tunnel lining concrete according to claim 1 or 2, wherein the self-propelled traveling body is a backhoe. A tunnel lining concrete curing device for curing the concrete by spraying a curing liquid on the surface of the tunnel lining concrete after demolding,
A self-propelled traveling body, a movable boom provided on the self-propelled traveling body, an arcuate shape that is rotatably attached to the tip of the movable boom, has a spray nozzle, and is connected to a curing liquid supply source Tunnel lining concrete curing device with spray arm.   5. The tunnel lining concrete curing according to claim 4, wherein the arch-shaped spray arm is configured by rotatably connecting a plurality of spray units, and is formed in an arch shape so that the spray unit can be rotated and moved. apparatus.   The curing apparatus for tunnel lining concrete according to claim 4 or 5, wherein the curing liquid supply source includes a curing liquid tank and a spray pump provided in the self-propelled traveling body.   The tunnel lining concrete curing device according to any one of claims 4 to 6, wherein the self-propelled traveling body is a backhoe.

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