JP6039853B1 - How to build a dam corridor - Google Patents

Abstract

A technique for further improving the filling property of concrete below the bottom surface of a corridor cell is provided. A gantry cell for a dam corridor, on which a pedestal on which a precast corridor cell having a plurality of holes is formed is placed, is installed on a levee body concrete of a front lift. An installation step, an installation step of the corridor cell for placing the corridor cell on the gantry, a gap below the bottom surface of the corridor cell placed on the gantry, a periphery below the bottom surface of the corridor cell, and Including placing concrete around a corridor cell and embedding the corridor cell, in the concrete placing step, while confirming the filling status from the plurality of holes, Place concrete in the gap below the bottom of the corridor cell. [Selection] Figure 7

Description

  The present invention relates to a method for constructing a dam corridor, a dam corridor, a corridor cell of a dam corridor, and a mold used for manufacturing the corridor cell.

  As a construction method of a corridor to be installed inside a dam body of a concrete dam, there is a technique described in Patent Document 1, for example. In the construction method of the dam corridor described in Patent Document 1, a mounting frame is installed on the levee concrete of the front lift, and the precast reinforced concrete corridor cells formed into a tunnel shape on the mounting frame are sequentially and successively formed. Leaving the bottom of the corridor cells, placing the levee concrete at a predetermined height, and then placing a fluidized binder around the bottom of the corridor cells. The corridor cell is buried by flowing into the gap below the bottom of the corridor cell and filling the upper layer with concrete.

Japanese Patent No. 3064841

  When installing a precast corridor cell, it is preferable that the concrete filled under the bottom face of the corridor cell is excellent in filling property. For example, in the technique described in Patent Document 1, a high-fluidity concrete that does not require compaction and has excellent fluidity is filled in the space below the bottom surface of the corridor cell. Although the high fluidity concrete is excellent in filling property as compared with general slumped concrete requiring compaction, it is preferable that the filling property of the concrete below the bottom surface of the passage cell is higher.

  This invention makes it a subject to provide the technique which further improves the filling property of the concrete below the bottom face of a corridor cell in view of such a problem.

  In order to solve the above problems, a plurality of holes were formed in the bottom surface of the corridor cell. Specifically, the present invention relates to a method for constructing a dam corridor, wherein the dam corridor cell is formed on a levee concrete of a front lift, and a plurality of holes are formed on a bottom surface. A step of installing a pedestal on which a pedestal cell is placed, a step of installing a pedestrian cell on which the pedestrian cell is placed on the pedestal, and a bottom surface of the gallery cell placed on the pedestal And a concrete placing step for placing the concrete around the passage cell and embedding the passage cell, and in the concrete placing step, A method for constructing a dam corridor in which concrete is placed in a space below the bottom surface of the corridor cell while confirming a filling state from the plurality of holes.

According to the method for constructing a dam corridor according to the present invention, it is possible to reliably check whether concrete is filled below the bottom surface of the passage cell through a plurality of holes when placing concrete. . For example, in comparison with a conventional corridor cell in which only one air vent hole is formed in the center of the bottom surface of the corridor cell, it is surely confirmed whether or not concrete is filled below the bottom surface of the passage cell. Can do. As a result, the concrete can be sufficiently filled below the bottom surface of the passage cell. Note that concrete may be filled through a plurality of holes. Moreover, the concrete placement process may not be after the passage cell installation process. For example, the space below the bottom surface of the corridor cell placed on the pedestal and the periphery below the bottom surface of the corridor cell may be placed with concrete before placing the corridor cell on the pedestal.

  The space below the bottom surface of the passage cell is a space formed between the bottom surface of the passage cell placed on the gantry and the installation surface of the gantry. The installation surface of the gantry is the upper surface of the levee concrete of the front lift. The lift is the height of one portion of the concrete that is continuously driven once in one block. The front lift is a block of embankment concrete that has been placed immediately before. In other words, the periphery below the bottom surface of the corridor cell is the periphery of the air gap, and is a region from the installation surface of the gantry to the bottom surface of the corridor cell in the periphery of the corridor cell. The periphery of the corridor cell is a region other than the periphery below the bottom surface of the corridor cell, that is, the upper part of the periphery of the corridor cell than the bottom surface of the corridor cell.

  Further, in the concrete placing step, the gap below the bottom surface of the corridor cell precedes the periphery below the bottom surface of the corridor cell, or the gap below the bottom surface of the corridor cell and the corridor cell It is also possible to cast concrete around the periphery below the bottom and then cast concrete around the corridor cell.

  Conventionally, the gap below the bottom surface of the corridor cell is difficult to fill with concrete compared with the periphery below the bottom surface of the corridor cell and the periphery of the corridor cell, and the work takes time. In order to improve the filling of the concrete in the gap below the bottom surface of the corridor cell, for example, when using high-fluidity concrete, the surrounding concrete below the bottom surface of the corridor cell is placed in advance to It was necessary to make a wall that dammed the high-fluidity concrete placed in the gap below the bottom of the corridor cell. Therefore, compared to the gap below the bottom surface of the corridor cell, there is a need for partially placing the surrounding concrete below the bottom surface of the corridor cell where the amount of concrete placement is large. There was concern.

  In the method for constructing a corridor cell according to the present invention, since the concrete can be placed prior to the periphery below the bottom surface of the corridor cell, the void below the bottom surface of the corridor cell, In comparison, it is possible to work without stopping the surrounding concrete placement below the bottom surface of the corridor cell with a large amount of concrete placement. As a result, the working efficiency can be improved as compared with the prior art. Placing after that may be performed in the next step, or may be performed after other steps are interposed therebetween.

  The construction method of placing concrete in the space below the bottom surface of the corridor cell prior to the periphery below the bottom surface of the corridor cell is the so-called RCD method (Roller Compacted Dam-Concrete), CSG method (Cented Sand and Gravel). Can be suitably used. The construction method in which concrete is simultaneously placed in the gap below the bottom surface of the passage cell and the periphery below the bottom surface of the passage cell can be suitably used assuming a so-called expansion layer method and columnar block method.

  Here, when the corridor cell construction method according to the present invention is applied to the so-called RCD construction method and CSG construction method, construction may be performed as follows. For example, in the concrete placing step, high-fluidity concrete is placed in a space below the bottom surface of the corridor cell, and then slump concrete is provided around the bottom bottom surface of the corridor cell and around the corridor cell. May be placed.

By using the high fluidity concrete, the filling property can be further improved as compared with the conventional case. High fluidity concrete is a concrete that has no need for compaction and has excellent fluidity. Slump concrete is a concrete that requires compaction that has been conventionally used for embankment concrete. Placing after that may be performed in the next step, or may be performed after other steps are interposed therebetween.

  Further, in the method for constructing a corridor cell according to the present invention, before the concrete placing step, a mold is installed at a boundary between a gap below the bottom surface of the corridor cell and a periphery below the bottom surface of the corridor cell. It may further include an installation step of forming the mold.

  By installing the formwork as described above, high-fluidity concrete can be placed in the space below the bottom surface of the corridor cell prior to the periphery below the bottom surface of the corridor cell. As an example, a lath mold can be used as the mold.

  Here, when the construction method of the corridor cell according to the present invention is applied to a so-called extended layer construction method and columnar block construction method, construction may be performed as follows. For example, in the concrete placing step, in the concrete placing step, a gap is formed in the gap below the bottom surface of the corridor cell between the slump concrete placing surface and the ceiling top. Slump concrete may be placed and then the gap may be filled with a filler.

  In the case of using high-fluidity concrete, a production facility for high-fluidity concrete is required in addition to general slump concrete that requires compaction. Moreover, since high fluidity concrete requires much mixing time and setting time compared with slump concrete, there is a concern that the process may be delayed. According to the construction method of the corridor cell according to the present invention, the bank body can be constructed without using the high fluidity concrete. This eliminates the need for high-fluidity concrete equipment and can reduce costs. In addition, since the kneading time and the placing time can be shortened, the working efficiency can be improved as compared with the conventional case. It should be noted that filling after that may be performed in the next step, or may be performed with another step interposed therebetween.

  Moreover, the construction method of the corridor cell according to the present invention may further include a filler filling step of filling the filler from the plurality of holes after the concrete placing step. Since the filler can be filled from the corridor cell, the filling operation can be performed without being influenced by the concrete placing process around the corridor cell. As a result, the working efficiency can be improved as compared with the prior art.

  Here, you may identify this invention as a dam corridor constructed | assembled by the construction method of the corridor cell mentioned above. For example, the dam corridor according to the present invention is a corridor cell of a dam corridor that is continuously placed on a pedestal installed on a levee concrete of a front lift, and a plurality of holes are formed on the bottom surface With a precast corridor cell.

  Moreover, you may identify this invention as a corridor cell of a dam corridor used for the construction method of the corridor cell mentioned above. For example, a corridor cell of a dam corridor according to the present invention is a corridor cell of a dam corridor installed on a gantry in the construction of a dam corridor, and concrete is placed in a space below the bottom surface of the corridor cell. A plurality of holes are formed on the bottom surface for confirming the state of filling of the concrete when placing. Further, the plurality of holes may be formed in a staggered pattern. The plurality of holes may be used as holes when filling concrete or as fillers, and in this case, in particular, the filling efficiency of concrete and fillers can be improved and work efficiency can be improved. .

Moreover, this invention can be specified as a formwork used for manufacture of the corridor cell mentioned above. For example, a formwork used for manufacturing a corridor cell according to the present invention is a formwork used for manufacturing a corridor cell placed on a gantry in the construction of a dam corridor. The mold main body and the mold main body are provided in an area corresponding to the bottom surface of the corridor cell, and the concrete filling state is confirmed when placing concrete in the gap below the bottom surface of the corridor cell. A projection for forming a plurality of holes.

  ADVANTAGE OF THE INVENTION According to this invention, the technique which further improves the filling property of the concrete below the bottom face of a corridor cell can be provided.

FIG. 1: shows the perspective view which looked at the dam dam body which concerns on 1st Embodiment from the front. FIG. 2 shows an example of a dam corridor according to the first embodiment. FIG. 3 shows a front view of the corridor cell according to the first embodiment. FIG. 4 shows a side view of the corridor cell according to the first embodiment. FIG. 5 is a cross-sectional view taken along line AA of FIG. FIG. 6 shows an exploded perspective view of the formwork of the corridor cell. FIG. 7 shows a flow diagram of a method for constructing a corridor cell in the RCD method / CSG method according to the first embodiment. FIG. 8 shows a state where the differential bars are installed in the installation process of the gantry. FIG. 9 shows a state in which the gantry is installed in the gantry installation process. FIG. 10 shows a state where the corridor cell is installed in the corridor cell installation process. FIG. 11 shows a state in which the lath mold is installed in the mold installation process. FIG. 12 is a perspective view showing a state in which the lath mold is installed in the mold installation process. FIG. 13 shows the placement of high fluidity concrete in the high fluidity concrete placement process. FIG. 14 shows a state in which high-fluidity concrete is placed in the high-fluidity concrete placing process. FIG. 15 shows a state where the periphery below the bottom surface of the corridor cell is placed in the slump concrete placing step. FIG. 16 shows a state where the periphery of the corridor cell is placed in the slump concrete placing process. FIG. 17: shows the flowchart of the construction method of the corridor cell in the extended layer method and the columnar block method based on 2nd Embodiment. FIG. 18 shows a state in which the lower portion of the bottom of the corridor cell and the periphery thereof are placed in the slump concrete placement step (1). FIG. 19 shows a state where the corridor cell is installed in the corridor cell installation process. FIG. 20 shows a state in which the periphery of the corridor cell is placed in the slump concrete placing step (2). FIG. 21 shows a state in which the filling material is filled in the gap below the bottom surface of the corridor cell in the filling material filling step.

  Next, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below is an example for carrying out the present invention, and the present invention is not limited to the mode described below.

<First Embodiment>
<Dam dam body, dam corridor>
FIG. 1: shows the perspective view which looked at the dam dam body which concerns on 1st Embodiment from the front. FIG. 2 shows an example of a dam corridor according to the first embodiment. FIG. 2 is an example of a dam corridor, and corresponds to a region surrounded by a circle in FIG. The dam dam body 1 is made of concrete, and is provided with a dam corridor 3 (also referred to as an audit gallery) that is formed by continuously installing a precast corridor cell 2 therein. Such a dam dam body 1 is constructed by executing a dam dam body construction method described later.

<Corridor cell>
FIG. 3 shows a front view of the corridor cell according to the first embodiment. FIG. 4 shows a side view of the corridor cell according to the first embodiment. FIG. 5 is a cross-sectional view taken along the line AA in FIG. The corridor cell 2 shown in FIG. 3 to FIG. 5 is a concrete precast corridor cell 2 manufactured in a factory, and constitutes a horizontal corridor of the dam corridor 3. The corridor cell 2 includes a horizontal bottom surface 21, a wall 22 raised vertically from both ends of the bottom surface 21, and an inverted U-shaped ceiling 23 connected to the upper end of the wall 22. A drainage groove 24 is formed on the bottom surface 21 of the passage cell 2. In addition, a plurality of filling holes 25 are formed on the bottom surface 21 of the corridor cell 2 in a staggered manner for confirming the filling state when placing concrete. The wall 22 of the corridor cell 2 is formed with a suspension hole 26 used when the corridor cell 2 is lifted.

  The corridor cell 2 shown in FIG. 3 to FIG. 5 is an example of the corridor cell 2. As the corridor cell 2, a stairway corridor cell constituting a staircase portion of the dam corridor 3, a dam passage Examples include a corridor cell for a curve that forms a curved portion of the corridor 3, a corridor cell for an intersection that forms an intersecting portion of the dam corridor 3, a corridor cell for an entrance that forms the entrance and exit of the corridor cell 2, and the like Is done. And the dam corridor 3 is constructed | assembled by combining these various corridor cells suitably. These various passage cells also have a plurality of filling holes 25 formed in a staggered pattern on the bottom surface 21.

<Corridor cell formwork>
FIG. 6 shows an exploded perspective view of the formwork of the corridor cell. FIG. 6 shows the mold 4 of the corridor cell shown in FIGS. The corrugated cell mold 4 includes an outer mold 41, an inner mold 42, a suspension hole projection 43, a filling hole projection 44, and a drainage trench mold 45. The outer mold 41 and the inner mold 42 are examples of the main body of the mold of the present invention. The outer mold 41 supports the outer side of the wall 22 of the corridor cell 2 and the outer side of the ceiling connected to the wall, and supports the outer sides of the pair of first outer mold frames 411 and 411 and the bottom surface 21 of the corridor cell 2. A second outer mold 412 is provided. The inner mold frame 42 supports the inner side of the wall 22 of the corridor cell 2 and the inner side of the ceiling 23 connected to the wall 22, and a pair of first inner mold frames 421 and 421, the inner side of the bottom surface 21 of the corridor cell 2. A second inner mold 422 to be supported is provided. A suspension hole projection 43 for forming the suspension hole 26 is connected to the outside of the pair of first inner molds 421 and 421. Also, on the outside of the second inner mold 422, drainage groove molds 45 for forming the drainage grooves 24 and filling hole protrusions 44 for forming the filling holes 25 are connected in four locations in a staggered manner. Has been.

  Note that the corridor cell mold 4 shown in FIG. 6 is an example of the corridor cell mold. The form of the corridor cell includes the form of the corridor cell for the staircase, the form of the corridor cell for the curve, the form of the corridor cell for the intersection, and the form of the corridor cell for the entrance / exit. Etc. are exemplified. A plurality of filling hole projections 44 are also connected in a staggered manner to the outside of the second inner mold form in the molds of these various corridor cells.

  The connection between the outer mold frames 41, the connection between the inner mold frames 42, and the connection between the outer mold frame 41 and the inner mold frame 42 may be appropriately performed using existing fixtures and metal fittings such as bolts, nuts, and separators. it can.

<How to build a corridor cell>
Next, the construction method of the corridor cell will be described. The construction method of the corridor cell will be described by dividing into a method applied to the so-called RCD method (Roller Compacted Dam-Concrete) and the CSG method, a so-called extended layer method, and a method applied to the columnar block method. 1st Embodiment demonstrates the construction method of the corridor cell in a RCD construction method and a CSG construction method.

<Construction method of corridor cell in RCD method / CSG method>
FIG. 7 shows a flow diagram of a method for constructing a corridor cell in the RCD method / CSG method according to the first embodiment. The construction method of the corridor cell in the RCD method / CSG method can be suitably used for a relatively large dam.

  First, in step S01, the pedestal 5 on which the corridor cell 2 is placed is installed on the levee body concrete 11 of the front lift (installation step of the pedestal). Here, FIG. 8 shows a state in which the differential bars are installed in the installation process of the gantry. As shown in FIG. 8, the differential bars 51, 51 are installed on the levee body concrete 11 of the front lift at an interval narrower than the lateral width of the corridor cell 2. FIG. 9 shows a state in which the gantry is installed in the gantry installation process. As shown in FIG. 9, the leg members 52 and 52 of the gantry constituting the gantry 5 are welded and fixed to the differential bars 51 and 51. Further, a horizontal receiving member 53 that supports the corridor cell 2 is welded and fixed to the upper ends of the leg members 52 and 52 of the gantry. Further, reinforcing reinforcing bars 54 and 54 are fixed to the base leg members 52 and 52 in a bracing manner by welding. Thus, the installation of the gantry 5 is completed.

  Next, in step S02, the corridor cell 2 is placed on the gantry 5 (the corridor cell installation step). FIG. 10 shows a state where the corridor cell is installed in the corridor cell installation process. As shown in FIG. 10, the corridor cell 2 lifted by a crane or the like is placed on the gantry 5 installed in the gantry installation process. The corridor cell 2 is sequentially placed so as to be continuous in the longitudinal direction of the dam corridor 3. The gantry 5 and the corridor cell 2 can be connected using, for example, a metal fitting (not shown) welded to the horizontal receiving member 53 of the gantry 5. The corridor cells 2 can be connected to each other by bolts or cotters via joint fittings (not shown). Thus, the installation of the corridor cell 2 is completed.

  Next, in step S03, the lath mold 6 is installed on the levee concrete 11 of the front lift so as to surround the periphery below the bottom surface of the corridor cell 2 (form setting process). FIG. 11 shows a state in which the lath mold is installed in the mold installation process. FIG. 12 shows a perspective view in which a lath mold is installed in the mold installation process. As shown in FIGS. 11 and 12, the lath form 6 is installed on the levee body concrete 11 of the front lift so as to surround the periphery below the bottom surface of the passage cell 2. In FIG. 12, a plurality of corridor cells 2 constituting a horizontal corridor are connected, and a stairway corridor cell constituting a staircase portion of the dam corridor 3 is connected to both ends. And the lath form 6 is installed so that the circumference | surroundings below the bottom face of these several corridor cells 2 may be surrounded. A ladder is installed in the staircase corridor cell located on the front side of FIG. Thus, the installation of the lath form 6 is completed.

  Next, in step S04, high-fluidity concrete C1 is placed (high-fluidity concrete placing step). The high fluidity concrete placing process is an example of the concrete placing process of the present invention. The high fluidity concrete C1 is a concrete that does not require compaction and has excellent fluidity. Here, FIG. 13 shows the high-fluidity concrete placement state in the high-fluidity concrete placement step. FIG. 14 shows a state in which high-fluidity concrete is placed in the high-fluidity concrete placing process. As shown in FIG. 13, high-fluidity concrete C <b> 1 is placed, for example, with a hopper, in the gap inside the lath mold 6 and below the bottom surface of the corridor cell 2. The placement of the high fluidity concrete C <b> 1 is performed while checking the filling state from the plurality of filling holes 25. As a result, as shown in FIG. 14, the high fluidity concrete C <b> 1 can be sufficiently filled below the bottom surface of the corridor cell 2. Thus, the placement of the high fluidity concrete C1 is completed.

Next, in step S05, slump concrete C2 is placed (placement process of slump concrete). The slump concrete placing process is an example of the concrete placing process of the present invention. The slump concrete C2 is a concrete requiring compaction that has been conventionally used for embankment concrete. Here, FIG. 15 shows a state in which the periphery below the bottom surface of the passage cell is placed in the slump concrete placing step. FIG. 16 shows a state where the periphery of the corridor cell is placed in the slump concrete placing process. As shown in FIG. 15, slump concrete C <b> 2 is placed on the outside of the lath mold 6 and around the bottom of the corridor cell 2 by, for example, a hopper (not shown). Thereafter, slump concrete C2 is sequentially placed around the corridor cell 2. As a result, as shown in FIG. 16, the high fluidity concrete C1 is filled below the bottom surface of the corridor cell 2, and the slump concrete C2 is placed around the other, and the corridor cell 2 and the dam body concrete are placed. A part of the dam corridor 3 in which (the high fluidity concrete C1 and the slump concrete C2) are integrated is completed. Thus, the placement of the slump concrete C2 is completed.

  The dam dam body 1 and the dam corridor 3 are completed by appropriately repeating the processes described above.

<Effect>
According to the dam corridor construction method according to the first embodiment (the corridor cell construction method in the RCD method / CSG method), the corridor is inserted through the plurality of filling holes 25 when placing the high-fluidity concrete C1. Whether or not the high fluidity concrete C1 is filled below the bottom surface of the cell 2 can be reliably confirmed. Therefore, for example, whether or not high-fluidity concrete C1 is filled below the bottom surface of the corridor cell 2 as compared to a conventional corridor cell in which only one air vent hole is formed in the center of the bottom surface of the corridor cell. Can be confirmed reliably. As a result, the high-fluidity concrete can be sufficiently filled below the bottom surface of the corridor cell 2. Note that concrete may be filled through a plurality of holes. Further, by using the high fluidity concrete C1, for example, the filling property can be improved as compared with the case of using slump concrete.

  Moreover, in the construction method of the dam corridor according to the first embodiment, the lath mold 6 is installed so as to surround the lower periphery of the bottom surface of the corridor cell 2, so that the gap below the bottom surface of the corridor cell 2 is High fluidity concrete C1 can be placed prior to the periphery below the bottom surface of the corridor cell 2. Therefore, compared with the space below the bottom surface of the corridor cell 2, it is possible to work without stopping the surrounding concrete placement below the bottom surface of the corridor cell 2, which has a large amount of concrete placement. As a result, the working efficiency can be improved as compared with the prior art.

Second Embodiment
2nd Embodiment demonstrates the case where the construction method of a corridor cell is applied to what is called an extended layer construction method and a columnar block construction method. The construction method of the corridor cell in the extended layer construction method / columnar block construction method can be suitably used for medium-scale dams and small-scale dams. The corridor cell 2 and the corrugated cell mold 4 may be the same as those described in the first embodiment. Therefore, these explanations are omitted. Moreover, although the dam body 1 and the dam corridor 3 constructed | assembled by the construction method of the corridor cell in an extended layer construction method and a columnar block construction method are medium scale or small scale compared with 1st Embodiment, The functions of the dam body 1 and the dam corridor 3 are the same. Therefore, these explanations are also omitted.

<Construction method of corridor cell in extended layer method and columnar block method>
FIG. 17: shows the flowchart of the construction method of the corridor cell in the extended layer method and the columnar block method based on 2nd Embodiment. In step S11, as shown in FIGS. 8 and 9, as in step S01, the gantry 5 on which the corridor cell 2 is placed is installed on the levee concrete 11 of the front lift (installation step of the gantry). . In that case, the top 5 of the mount 5 (the top end of the horizontal receiving material 53) is raised and the mount 5 is installed. For example, the gantry 5 is installed so that the top end is 30 mm higher than the placement surface of the slump concrete C2 as a raised portion. Instead of raising the platform 5, the slump concrete placement process of the slump concrete C <b> 2 may be adjusted to be lower than the top end of the platform 5 in the slump concrete placement process of step S <b> 21 described later. .

  Next, in step S12, slump concrete C2 is placed below and around the bottom surface of the corridor cell 2 (slump concrete placement step (1)). The slump concrete placing step (1) is an example of the concrete placing step of the present invention. Here, FIG. 18 shows a state where the lower part of the bottom surface of the corridor cell 2 and the periphery thereof are placed in the slump concrete placing process. As shown in FIG. 18, slump concrete C2 is placed below the bottom surface of the corridor cell 2 and around it. The slump concrete C <b> 2 is placed such that the placement surface is lower than the top end of the raised platform 5. In other words, the slump concrete C2 is placed so that a gap 7 is formed between the placement surface of the slump concrete C2 and the top end of the mount 5. Thus, the placement of slump concrete C2 under the bottom surface of the corridor cell 2 and around the bottom is completed.

  Next, in step S13, the corridor cell 2 is placed on the mount 5 (the corridor cell installation step). FIG. 19 shows a state where the corridor cell is installed in the corridor cell installation process. As shown in FIG. 19, the corridor cell 2 suspended by a crane or the like is placed on the gantry 5. The corridor cell 2 is sequentially placed so as to be continuous in the longitudinal direction of the dam corridor 3. Similarly to the first embodiment, the gantry 5 and the corridor cell 2 can be connected using, for example, a metal fitting (not shown) welded to the horizontal receiving member 53 of the gantry 5. The corridor cells 2 can be connected to each other by bolts or cotters via joint fittings (not shown). Thus, the installation of the corridor cell 2 is completed.

  Next, in step S14, slump concrete C2 is placed around the corridor cell 2 (slump concrete placing step (2)). The slump concrete placing step (2) is an example of the concrete placing step of the present invention. In the step of placing the slump concrete (2), slump concrete C2 is sequentially placed around the corridor cell 2. FIG. 20 shows a state in which the periphery of the corridor cell is placed in the slump concrete placing step (2). As shown in FIG. 20, slump concrete C <b> 2 is placed in addition to the gap 7 below the bottom surface of the corridor cell 2. Thus, the placement of the slump concrete C2 around the corridor cell 2 is completed.

  Next, in step S15, the gap M below the bottom surface of the corridor cell 2 (the gap 7 between the placing surface of the slump concrete C2 and the top of the mount 5) is filled with the filler M (filler). Filling step). FIG. 21 shows a state in which the filling material is filled in the gap below the bottom surface of the corridor cell in the filling material filling step. As shown in FIG. 21, in the filling process of the filling material, the high-flowing mortar as the filling material M is filled into the gap 7 below the bottom surface of the passage cell 2 from the plurality of filling holes 25 in the passage cell 2. The As described above, a part of the dam corridor 3 in which the corridor cell 2 and the dam body concrete (slump concrete C2) are integrated is completed. Thus, filling of the filler M is completed.

  The dam dam body 1 and the dam corridor 3 are completed by appropriately repeating the processes described above.

<Effect>
According to the construction method of the dam corridor according to the second embodiment (the construction method of the corridor cell in the extended layer construction method / columnar block construction method), the dam dam body 1 and the dam corridor 3 are used without using the high-fluidity concrete C1. Can be built. In the case of using the high fluidity concrete C1, a production facility for the high fluidity concrete C1 is required in addition to the general slump concrete C2 that requires compaction. Moreover, since the high fluidity concrete C1 requires much mixing time and setting time compared with the slump concrete C2, there exists a concern about the delay of a process. In the construction method of the dam corridor according to the second embodiment, since the high-fluidity concrete C1 is not used, the equipment for the high-fluidity concrete C1 is not necessary, and the cost can be reduced. In addition, since the kneading time and the placing time can be shortened, the working efficiency can be improved as compared with the conventional case.

  In addition, when the slump concrete C2 is placed, it is possible to reliably check whether the slump concrete C2 is filled below the bottom surface of the passage cell 2 through the plurality of filling holes 25. Therefore, for example, whether or not slump concrete C2 is filled below the bottom surface of the corridor cell 2 as compared with a conventional corridor cell in which only one air vent hole is formed at the center of the bottom surface of the corridor cell. Can be confirmed reliably. As a result, the slump concrete C2 can be sufficiently filled below the bottom surface of the corridor cell 2. Note that the slump concrete C2 may be filled through the plurality of filling holes 25.

  Moreover, the construction method of the corridor cell which concerns on 2nd Embodiment can be filled with the filler M from the several filling hole 25 after the placement process of slump concrete. Since the filler M can be filled from the corridor cell 2, the filling operation can be performed without being influenced by other processes. As a result, the working efficiency can be improved as compared with the prior art. Moreover, since the several filling hole 25 is formed in zigzag form, while being able to improve the filling property of a filler, work efficiency can be improved. Furthermore, when the corridor cell 2 is installed, most of the pedestal 5 is already embedded in the slump concrete C2. Therefore, when installing the corridor cell 2, the contact between the corridor cell 2 and the gantry 5 can be reduced, and as a result, the breakage of the corridor cell 2 due to the contact can also be reduced.

  The preferred embodiments of the present invention have been described above. However, the dam corridor construction method, the dam corridor, the corridor cell of the dam corridor, and the mold used for manufacturing the corridor cell according to the present invention are various. It will be apparent to those skilled in the art that changes, improvements, combinations, and the like can be made.

DESCRIPTION OF SYMBOLS 1 ... Dam body 11 ... Bank body concrete 2 ... Corridor cell 21 ... Bottom 22 ... Wall 23 ... Ceiling 24 ... Drainage channel 25 ... Filling hole 3. ..Dam corridor 4 ... Formwork 41 ... Outer formwork 42 ... Inner formwork 43 ... Suspension projection 44 ... Filling hole projection 45 ... Drainage channel Form 5 ... frame 51 ... differential bar 52 ... frame base material 53 ... horizontal receiving material 54 ... reinforcing bar 6 ... lath mold frame 7 ... gap C1 ... High fluidity concrete C2 ... Slump concrete M ... Filler

Claims (1)

A method for constructing a dam corridor,
Installation of a pedestal on the levee concrete of the front lift, on which a pedestrian cell of the dam corridor is placed, on which a precast gallery cell with a plurality of holes formed in a staggered pattern is placed on the bottom surface Process,
After the installation step of the gantry, placing the slump concrete on the levee body concrete of the front lift to a height lower than the top of the gantry; and
After the step of placing the slump concrete, the step of installing a corridor cell for placing the corridor cell on the gantry,
After the step of installing the corridor cell, placing the slump concrete around the corridor cell and burying the corridor cell;
Filling a filling material or concrete into a gap between a plurality of holes formed in a staggered shape on the bottom surface of the passage cell and a placement surface of slump concrete below the bottom surface of the passage cell. ,
How to build a dam corridor.

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