JP3889112B2 - Dam dam corridor and its construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dam embankment corridor and a construction method thereof, and more particularly, to a corridor constructed using a prefabricated embedded formwork and a construction method of the corridor using the buried formwork. .
[0002]
[Prior art]
Inside the dam body, there are vertical and horizontal corridors for maintenance and inspection, operation passages, or external drainage of leaked water. The corridor is generally formed of cast-in-place concrete that constitutes a bank body. For this reason, it was necessary to install the formwork over a wide range in a short time and to perform support work in accordance with the concrete driving. On the other hand, in some dams, attempts have been made to construct a corridor by stacking concrete blocks, or to construct a corridor by connecting donut-shaped precast concrete members in the axial direction.
[0003]
[Problems to be solved by the invention]
However, when using the conventional method of formwork and support, a large number of skilled workers must be concentrated in a short period of time. For this reason, it is difficult to secure workers in the recent shortage of manpower. In addition, the support work must be maintained while curing the cast-in-place concrete, so the interior of the corridor cannot be used for carrying materials or passing workers. Furthermore, if a part of work is delayed, the whole work schedule is affected, resulting in a longer construction period and cost increase.
On the other hand, the method of stacking concrete blocks and the method of connecting precast concrete members have problems in terms of reliability such as integration with cast-in-place concrete. Moreover, in order to perform installation work by suspending a huge concrete member, a heavy machine such as a large crane is required.
The present invention has been proposed in view of the above, and it is an object of the present invention to provide a corridor that is well-suited with on-site concrete and has high reliability at a low cost and in a short period of time by simple construction.
[0004]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention described in claim 1 is a corridor provided in a dam dam body formed by assembling a concrete embedded formwork produced in advance in a factory so as to secure a passage space at a dam construction site. The embedded form is composed of a ceiling panel that forms a ceiling part and a side wall panel that forms a side wall part, and the length of the ceiling panel is half of the side wall panel and is adjacent to the ends of the two panels. Provided with connecting means for connecting with the embedded formwork, and also provided with an adhesion processing part and an adhesion bar on the joint surface with the cast-in-place concrete, and connecting multiple embedded formwork by connecting means at the construction site This is a dam embankment corridor that forms a passage space and is cast into the surrounding concrete and integrated with the concrete.
Moreover, the invention described in claim 2 is made of concrete manufactured in advance in a factory, and includes an adhesion processing portion and an adhesion reinforcement , and includes a ceiling panel that forms a ceiling portion and a side wall panel that forms a side wall portion. The embedded formwork, which is half the length of the side wall panel, is hung at a predetermined position on the dam construction site, assembled so as to secure a passage space inside, and corresponds to one lift of cast-in-place concrete placed around Then, a simple support work is made inside, and the simple support work is sequentially moved in response to the lift of the cast-in-place concrete, and after the cast-in-place concrete in the surrounding area is completed, the simple support work is removed and buried This is a method of constructing a dam bank corridor that integrates a frame and cast-in-place concrete.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the dam body 1 constructed in the mountainous area, a corridor 11 is provided vertically and horizontally for maintenance and inspection, or as a visitor's passage after completion, while it is used to carry workers and equipment during construction. It is circulated. This corridor 11 is not only provided on a horizontal plane, but is often provided as a staircase 12 on the slope connecting the layers, and an elevator 13 is also provided. The dam body 1 is classified into various types such as gravity type, rockfill type, arch type, etc. depending on its structure, but the corridor 11 is necessary for any type of dam.
[0006]
Conventionally, when constructing the dam body 1, concrete is driven over a wide range, so to provide the passage 11, the formwork must be assembled in accordance with the concrete driving work, It was necessary to concentrate workers in a short time. On the other hand, since the strength of the levee body 1 should not be reduced by opening the passage 11, the passage 11 must be integrated with the dam body 1 to ensure strength.
[0007]
The present invention provides a corridor 11 that can be constructed in a short period of time using a prefabricated embedded formwork and that exhibits sufficient strength. That is, the outline of the present invention is that the corridor 11 disposed in the dam body 1 is divided into appropriate lengths in the axial direction, and is also divided into appropriate portions in the cross section, and these are divided. A concrete member to be an embedded form corresponding to each part is produced in advance in a factory, and this concrete product is assembled and formed at a construction site.
[0008]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The drawing shows a case where the passage 11 arranged in the dam body 1 of the dam is divided into a ceiling part, a side wall part and a bottom floor part in the cross section, and the bottom floor part uses a concrete slab made in the field. Yes.
[0009]
That is, in the embodiment shown in the drawings, a ceiling panel 2 (see FIGS. 5 to 7) for forming a ceiling portion and a side wall panel 3 (see FIGS. 8 to 9) for forming a side wall portion are provided. It has been prepared in advance as an embedded formwork. As an example, if the size of each panel is shown, the side wall panel 3 has a length of about 3 m and a height of about 2.5 m, and a thickness not including a reinforcing bar is about 6 cm. On the other hand, the ceiling panel 2 has a generally inverted cross-section, the width is about 3.1 m, the height is about 80 cm, and the length is about 1.5 m, which is half of the side wall panel 3. Thus, if the length of the ceiling panel 2 is half of the side panel, the weight of the ceiling panel 2 can be matched with the weight of the side surface, and work can be performed using the same crane or the like. .
[0010]
FIG. 2 is an allocation diagram of each panel showing a specific construction example. In this construction example, two horizontal portions 11a and 11b are connected to each other by a staircase portion 12a, and an end portion of one horizontal portion 11a is further provided. The other horizontal portion 11c communicates with the T-shape, and the elevator 13 is installed.
[0011]
Next, each panel will be specifically described. First, the side wall panel 3 forming the side wall portion of the passage 11 is a rectangular concrete product as shown in FIGS. 8 to 9, and has a width × height × thickness of about 300 × 250 as described above. The size is about 6 cm. Further, on the back side (side embedded in the dam body 1), an adhesion processing part 31 with a concavo-convex pattern is provided and a truss-like adhesion line 32 is provided.
[0012]
On the other hand, inside the side wall panel 3, as shown by broken lines in FIG. 8, internal reinforcing bars 33 are arranged in a lattice shape, and the truss reinforcing leg portions 32 a constituting the adhesive reinforcing bars 32 are fixed to the internal reinforcing bars 33. ing.
[0013]
Further, an embedded nut 42 for attaching a bracket fitting 41 for securing a support work described later is disposed at a desired position of the side wall panel 3. That is, in the case of the illustrated embodiment, embedded nuts 42 are embedded at three locations along the vicinity of the left and right side edges so that a three-stage support can be attached in the vertical direction.
[0014]
Further, embedded nuts 52 for attaching the connecting metal fittings 51 for connecting to other panels or the bottom floor are arranged on the outer edge of the side wall panel 3, that is, the upper and lower edges and the left and right side edges. It is. For example, in the illustrated embodiment, four portions are embedded along the upper and lower edge portions, and two upper and lower portions are embedded in the left and right side edges, respectively.
[0015]
And the joint part 34 of the step-like shape is formed in the upper end surface of the side wall panel 3 so that it may mutually fit, when connecting with the ceiling panel 2 mentioned later.
[0016]
In the illustrated embodiment, the surface of the side wall panel 3 (side exposed to the inside of the corridor 11) is laid out so as to be finished smoothly, but by providing a concavo-convex pattern on the formwork used during manufacture. Various designs can be applied to the surface of the completed side wall panel 3.
[0017]
As shown in FIGS. 5 to 7, the ceiling panel 2 installed above the side wall panel 3 has an inverted bowl shape with a narrowed upper end. That is, the swash plate portion 22 extends obliquely inward from the upper edges of the left and right side plate portions 21 facing each other, and the upper edge of the swash plate portion 22 communicates with each edge of the top plate portion 23 that is generally horizontal. .
[0018]
On the outer surface side of the ceiling panel 2, that is, the surface embedded in the dam dam body 1, an adhesion treatment is performed to provide an uneven surface 24, and an adhesion bar 25 is disposed on the top plate portion 23. Although not shown, internal reinforcing bars are arranged in a lattice pattern inside the ceiling panel 2.
[0019]
On the other hand, on the inner surface side that becomes the ceiling surface of the passageway 11, various designs can be applied to the ceiling surface by providing a concavo-convex pattern at the time of manufacture as in the case of the side wall panel 3.
[0020]
When the length of the ceiling panel 2 as described above is, for example, half of the side wall panel 3 described above, it is possible to achieve a weight balance between both panels, and it is possible to work with a common small crane or the like.
[0021]
A joint portion 26 corresponding to the joint portion 34 of the side wall panel 3 is formed at the lower end portion of the side surface of the ceiling panel 2. In addition, the embedded nut 27 for attaching the connection fitting 51 is arranged at a desired position.
[0022]
Although an embedded formwork may be prepared for the bottom floor portion of the passageway 11, in the illustrated embodiment, the bottom floor 6 is formed using concrete that is driven to construct the dam body 1. In addition, concrete is driven into the end portion of the bottom floor 6 after a side groove 7 for drainage is disposed in advance.
[0023]
The side groove 7 is formed by connecting so-called U-shaped grooves, which are concrete products having a U-shaped cross section, for example. FIG. 10 shows an example of the U-shaped groove. The length is about 2 m, the height is about 36 cm, and the inner diameter of the groove is about 30 cm. A reinforcing bar 72 is arranged in the wall 71. Further, when connecting the U-shaped grooves, the sealing material 74 may be filled in the concave portions 73 provided on the end surfaces.
[0024]
The corridor 11 formed in the horizontal portion is formed by sequentially connecting the side wall panel 3 and the ceiling panel 2 as described above. On the other hand, in order to connect with the corridors 11 of other levels, the corridors 11 need to be provided in an inclined shape between different levels. And although the bottom floor 6 of this inclined corridor 11 is good also as a slope, since the direction formed in step shape can absorb the difference in height in a short distance, it is efficient.
[0025]
Therefore, in the illustrated embodiment, a stair block 8 for forming a stair portion is prepared. That is, as shown in FIG. 11 to FIG. 13, a stair block 8 having a tread plate 81 and a kick plate 82 for five steps is provided per block. Then, an adhesion process is performed on the back side of the stair block 8 to form an adhesion part 83, and step joints 84 and 85 are provided on the front edge part and the rear edge part.
[0026]
On the other hand, on one side edge of the stair block 8, a mounting portion 86 for placing the side wall panel 3 is formed. On the other hand, the side groove 7 faces the other side edge, and the side wall panel 3 is placed on the upper end surface of the outer side edge of the side groove 7. In addition, as shown in FIG. 13, while forming a seal groove in each connection part, it is good to fill and seal with the sealing material 87. FIG.
[0027]
An appropriate angle block may be preliminarily configured at a portion where the passage 11 branches or changes direction, and may be appropriately combined as necessary. For example, 90 degrees, 135 degrees, etc. may be prepared.
[0028]
As described above, reinforcing bars are arranged on each panel. That is, the internal rebar 33 is disposed inside the embedded formwork. In addition, on the back side, adhesive muscles 25 and 32 for integrating with the bank body 1 are provided. Further, for example, as shown in FIG. 14, a structural reinforcing bar 9 which is a structural material of the bank body 1 is disposed around the panel, and is fixed to the adhesion reinforcing bars 25 and 32 or the internal reinforcing bar 33. If comprised in this way, an embedding formwork also becomes a part of structural material and does not cause the strength reduction of the dam body 1. FIG. In addition, the bar arrangement work can be performed in advance at the factory, or can be performed on site. On the other hand, the structural rebar 9 can be disposed in advance in an embedded formwork.
[0029]
A connection fitting 51 is used to connect the panels. That is, for connecting the ceiling panel 2 and the side wall panel 3, the plate-shaped connecting metal 51 is attached using the embedded nuts 27 and 52 embedded in appropriate positions of both panels. Further, the portion where the side wall panel 3 rises from the bottom floor 6 is attached with an L-shaped fixing metal 53 using the embedded nut 52 embedded in the panel as described above. Furthermore, the plate-shaped coupling metal 51 is attached using the embedded nut 52 for the axial extension of the side wall panel 3. A sealing material 54 is interposed between the panels.
[0030]
The passage 11 may be provided with an illumination or communication cable or an air conditioning duct. It is also possible to embed these on the back side.
[0031]
Next, the construction method of the dam bank corridor 11 according to the present invention will be described. First, concrete to be the bottom floor 6 is placed. At this time, the side groove 7 is embedded in advance.
[0032]
The side wall panel 3 is made to face and stand at a predetermined position. At this time, one side wall panel 3 is placed on the outer upper end surface of the side groove 7, and the other side wall panel 3 is placed on the upper surface of the bottom floor 6. And it connects with the bottom floor 6 using the L-shaped fixing metal fitting 53 attached using the embedded nut 52 embed | buried under the lower edge part. Further, a stay 62 is obliquely stretched between the anchor 61 embedded in the concrete slab and the adhesion bar 32 at an appropriate height position. Further, a pipe support 43 is interposed in the vicinity of the upper edge of the opposite side wall panel 3 to maintain the interval. In this way, the pair of side wall panels 3 are installed (see FIG. 15).
[0033]
Concrete is placed outside the side wall panel 3 installed as described above. At this time, in order to counteract the pressure by the concrete, the pipe support 43 is arranged at a position slightly lower than one lift, for example, 75 cm (see FIG. 16).
[0034]
As shown in FIG. 19, the pipe support 43 is attached to a support 45 having an angle shape attached by using an embedded nut 42 embedded in the side wall panel 3. It is held by a base jack 46 at the tip of the support.
[0035]
When driving of the first lift L1 is completed, the pipe support 43 is moved in preparation for driving of the second lift L2. That is, the pipe support 43 used for the first lift L1 is raised near the upper edge of the second lift L2 (see FIG. 17). At this time, the support metal fitting 44 and the crosspiece 45 are interposed as described above. Then, the second lift L2 is driven.
[0036]
Next, a support work is performed in preparation for driving the third lift L3. Since the third lift L3 reaches almost the upper edge of the side wall panel 3, this support work is first arranged for maintaining the distance. A pipe support 43 is sufficient (see FIG. 18). Then, the third lift L3 is driven.
[0037]
Furthermore, the ceiling panel 2 is installed. As described above, since the joint portion 26 is provided at the lower edge portion of the ceiling panel 2, the joint portion 26 is fitted to the joint portion 34 of the side wall panel 3 and is fastened by the connecting fitting 51.
[0038]
On the other hand, support work will be carried out inside. That is, as shown in FIG. 19, a jack 47 for supporting the ceiling panel 2 from the lower side, a pipe support 43 for supporting the ceiling panel 2 in the width direction, and the like are disposed. More specifically, the swash plate portion 22 of the ceiling panel 2 is supported with an angle piece 48 interposed therebetween, and a crosspiece 45 is disposed on the top plate portion 23. Then, a large pull 49 attached to the U head 47a is arranged in the axial direction to support the pier 45.
[0039]
Furthermore, since the length of the ceiling panel 2 is half the length of the side wall panel 3 as described above, two ceiling panels 2 are arranged per one side wall panel 3. And also, when connecting the ceiling panels 2 to each other, the connecting bracket 51 is used.
[0040]
When the installation of the ceiling panel 2 is finished, the fourth lift concrete is driven. This fourth lift has a height at which the top plate portion 23 is almost buried.
[0041]
On the other hand, as shown in FIGS. 20 and 21, in the staircase portion for connecting the corridors 11 of different levels, the number of support works increases. Can be constructed. The connecting pipe 63 and the rooting pipe 64 are bridged and fixed to each jack 47.
[0042]
As mentioned above, although embodiment of drawing was described for this invention, this invention is not limited to above-described embodiment, It can implement suitably, unless the structure described in the claim is changed.
[0043]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
Construction becomes extremely easy. That is, since it is sufficient to sequentially assemble and arrange the embedded formwork produced in the factory in advance, it is not necessary for skilled technicians such as formwork carpenters and rebar workers, and ordinary workers are sufficient if bolt tightening and simple welding are possible. . Therefore, it is extremely effective in resolving the shortage of labor due to the shortage of skilled engineers.
Moreover, in the construction of a dam body that needs to be driven over a wide area, it is not necessary to concentrate engineers in a short period of time, so there is no delay in the construction period due to lack of manpower.
Moreover, because it is a buried formwork, it has the effect of keeping concrete warm, it can be in an ideal curing state even in a dam constructed in a mountainous area, and it can suppress drying shrinkage. Maximum performance can be demonstrated.
On the other hand, it is not necessary to dismantle the formwork, and the interior can be used immediately after installation, and can pass through the corridor even during construction. Therefore, it is possible to smoothly carry in the curtain grouting material equipment.
By dividing the corridor into appropriate shapes, several types of divided panels or blocks can be prepared, and these panels or blocks can be combined to form the desired shape of the corridor. In addition to being effective in reducing costs, the benefits of precasting are also significant.
Furthermore, since it is easy to form an appropriate pattern on the surface of the panel or block, it can be applied to various designs or designs, and is especially applied to general open corridors that can be visited by visitors and tourists. In some cases, it can contribute to improving the image of the dam.
The support work is simple, the number of support work members can be greatly reduced, the safety of the formwork assembly work is improved, and the work can be sufficiently performed with a small crane.
[Brief description of the drawings]
FIG. 1 is a schematic view of a dam body to which a corridor according to the present invention is applied.
FIGS. 2A and 2B are a plan view and a side view showing allocation of a corridor.
FIG. 3 is a cross-sectional view of a corridor.
FIG. 4 is a side view in which a side wall panel and a ceiling panel are assembled.
FIG. 5 is a front view of a ceiling panel.
FIG. 6 is a plan view of a ceiling panel.
FIG. 7 is a side view of a ceiling panel.
FIGS. 8A and 8B are a front view and a side view showing an inner surface side of the side wall panel. FIGS.
FIGS. 9A and 9B are a rear view and a bottom view showing the outer surface side of the side wall panel. FIGS.
FIG. 10 is a front view and a side view showing a side groove, a front view and a side view showing a cross section, and a detailed view of a connecting portion.
FIG. 11 is a plan view and a side view showing a staircase block.
FIG. 12 is a back view and a front view showing a staircase block.
FIG. 13 is an explanatory diagram of a connection state between the stair block, the side groove, and the side wall panel.
FIG. 14 is a front view of a corridor showing the arrangement of support works and structural reinforcing bars.
FIG. 15 is an explanatory view showing a construction method of a corridor.
FIG. 16 is an explanatory view showing a construction method of a corridor.
FIG. 17 is an explanatory view showing a construction method of a corridor.
FIG. 18 is an explanatory view showing a construction method of a corridor.
FIG. 19 is an explanatory view showing a construction method of a corridor.
FIG. 20 is an explanatory diagram showing a construction method for a staircase portion.
21 is a cross-sectional view taken along line A in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dyke body 2 Ceiling panel 3 Side wall panel 7 Side groove 8 Stair block 11 Corridor 24 Uneven surface 25 Adhesion reinforcement 26 Joint part 31 Adhesion treatment part 32 Adhesion part 34 Joint part 43 Pipe support 47 Jack

Claims (2)

A corridor provided in a dam embankment formed by assembling a concrete embedded formwork produced in advance in a factory so as to secure a passage space at a dam construction site,
The embedded form consists of a ceiling panel that forms the ceiling part and a side wall panel that forms the side wall part, and the length of the ceiling panel is half of the side wall panel, and the embedded form form adjacent to the end parts of the two panels. In addition to providing connecting means for connecting to each other, an adhesion processing portion and an adhesion bar are provided on the joint surface with the cast-in-place concrete, and a plurality of embedded molds are connected by the connecting means on the construction site to provide a passage space inside. A dam embankment corridor characterized by being formed and cast with cast-in-place concrete around it and integrated with the cast-in-place concrete. A buried type that is made of concrete produced in advance and has an adhesion processing part and adhesion reinforcement, and consists of a ceiling panel that forms the ceiling part and a side wall panel that forms the side wall part, and the length of the ceiling panel is half that of the side wall panel. The frame is hung at a predetermined position on the dam construction site, assembled to secure the passage space inside, and a simple support work is done inside corresponding to one lift of the cast-in-place concrete cast around. The simple support works are moved sequentially according to the lift of the cast concrete, and after the surrounding cast-in-place concrete is completed, the simple support work is removed and the buried formwork and the cast-in-place concrete are integrated. The construction method of the dam wall corridor characterized by

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