Invert construction method

Abstract

To improve efficiency of invert placing work.SOLUTION: Concrete supplied from a stationary pump P is discharged from a flexible hose FH through a first placing piping FCP and concrete of a first layer is placed. Subsequently, the concrete supplied from the stationary pump P is discharged from the flexible hose FH through a second placing piping SCP installed above the first placing piping FCP and concrete of a second layer is placed on a top surface of the concrete of the first layer. The first placing and the second placing are executed by removing piping parts CP1, CP2 of the first placing piping FCP and the second placing piping SCP at a position where the placing is completed while moving a concrete discharge position backward.SELECTED DRAWING: Figure 1

Claims

1. The process of installing a concrete supply means for supplying concrete to the invert pouring area, The process involves providing a plurality of first piping sections detachably connected to each other along the concrete supply direction, and installing a first concrete-laying pipe for supplying the first layer of concrete to the invert in the concrete-laying area of ​​the invert, The process of installing the invert above the first concrete pouring pipe, with a plurality of second piping sections detachably connected to each other along the concrete supply direction, and the second pouring pipe for supplying the second layer of concrete of the invert supported by a plurality of support members arranged along the second pouring pipe, A process of installing a concrete supply destination switching means that switches the supply destination of the concrete supplied from the concrete supply means to either the first pouring pipe or the second pouring pipe, It has, A first concrete placement process in which the first layer of concrete is placed by discharging the concrete supplied from the concrete supply means to the first concrete placement pipe via the concrete supply destination switching means from a flexible pipe detachably connected to the concrete discharge end of the first concrete placement pipe, After the first concrete placement process, the flexible pipe is removed from the first concrete placement pipe and detachably connected to the tip of the second concrete placement pipe, and the concrete supplied from the concrete supply means to the second concrete placement pipe via the concrete supply destination switching means is discharged from the flexible pipe to place the second layer of concrete on the top surface of the first layer of concrete in a second concrete placement process. It has, The first concrete placement process described above is: (a) The process of pouring concrete in a predetermined first area, (b) After the concrete pouring in the first area is completed, the process of removing the flexible pipe, (c) After the concrete pouring in the first area is completed, a predetermined number of the first pipe sections are removed from the tip of the first concrete pouring pipe, (d) After the process in (c), the flexible pipe that was removed in the process in (b) is attached to the tip of the first concrete pouring pipe that remains after the process in (c), and then the pouring of the first layer of concrete is resumed. (e) The process of repeating steps (a) to (d) above until the entire pouring of the first layer of concrete is completed, It has, The second concrete placement process described above is: (f) The process of pouring concrete in a predetermined second area, (g) After the concrete pouring in the second area is completed, the process of removing the flexible pipe, (h) After the concrete pouring in the second area is completed, a predetermined number of the second pipe sections are removed from the tip of the second concrete pouring pipe, (i) After the process in (h), the flexible pipe that was removed in the process in (g) is attached to the tip of the second concrete pouring pipe that remains after the process in (h), and then the pouring of the second layer of concrete is resumed. (j) The process of repeating steps (f) to (i) above until the entire pouring of the second layer of concrete is completed, A method for pouring invert concrete, characterized by having the following features.

2. The invert casting method according to claim 1, characterized in that, after the second casting process, the support member is left in place within the layers of the first and second concrete, such that the highest part of the support member is located below the upper surface of the second concrete layer by a predetermined thickness.

3. The support member comprises a support leg, a jig detachably provided on the top of the support leg, and a pipe holding portion connected to the jig and provided above the top surface of the second concrete layer for holding the second concrete pouring pipe. The invert casting method according to claim 1, characterized in that the second casting process includes the steps of casting the second layer of concrete such that the upper surface of the jig is exposed from the upper surface of the second layer of concrete, then removing the jig from the second layer of concrete to form a recess in the place where the jig was, and further filling in the recess.

4. The invert casting method according to claim 3, characterized in that the support leg is installed such that the top of the support leg is located below the upper surface of the second layer of concrete by a predetermined thickness.

5. The method for pouring an invert according to claim 3 or 4, characterized in that when the jig is withdrawn from the second layer of concrete, multiple jigs are withdrawn at once.

6. The support member comprises a support leg and a pipe holding portion that is detachably attached to the top of the arm portion of the support leg and holds the second concrete pouring pipe. The top of the arm portion and the pipe holding portion are located above the upper surface of the second layer of concrete. The method for pouring an invert according to claim 1, characterized in that, in the second pouring process, the second layer of concrete is poured from above the poured upper surface of the second layer of concrete.

7. The second concrete pouring process includes the steps of: removing the pipe holder from the support leg after pouring the second layer of concrete; and cutting and removing the arm at a predetermined thickness below the top surface of the second layer of concrete. The invert casting method according to claim 6, characterized in that, after the second casting process, the cutting portion of the arm portion is located below the upper surface of the second layer of concrete by a predetermined thickness, and the support leg portion is left in place within the layers of the first and second layers of concrete.

8. In the second concrete pouring process, after pouring the second layer of concrete, the pipe holding portion is removed from the support leg portion, and the arm portion is bent at a position a predetermined thickness below the poured surface of the second layer of concrete. The invert casting method according to claim 6, characterized in that, after the second casting process, the support legs are left in the layers of the first and second concrete with the highest part of the arm positioned below the upper surface of the second concrete layer by a predetermined thickness.

Images