JP3872178B2 - Precast concrete unit constituting the corridor of concrete dam and the structure of the intersection of the corridor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a unit made of precast concrete used for providing a corridor in a concrete dam, particularly a gravitational dam, a method for installing the unit, and a structure of an intersection of the corridor.
[0002]
[Prior art]
In the dam body of the gravity dam, a corridor extending horizontally and obliquely is provided. The passage is composed of a plurality of annular or cylindrical units connected to each other. Each unit is made of precast concrete, on the surface of the concrete that is struck multiple times in the vertical and horizontal directions for building the dam body (ie on the building dam body) Installed. The unit installed on the concrete surface is then embedded in concrete that is further placed for building a bank.
[0003]
Conventionally, it has been proposed to install the unit on the concrete surface via a gantry (see JP-A-8-184025).
[0004]
According to this, each unit is stably installed on the concrete surface via the mount. However, on the other hand, it is necessary to arrange the anchor bars for fixing the gantry to the concrete surface with high accuracy in the concrete, and both of them for fixing the gantry and the anchor bars. The welding operation takes time and effort, and further, the welding operation depends on the weather. For this reason, the installation work of the said conventional unit is not enough at the point of the efficiency.
[0005]
The corridor provided in the levee body includes a horizontal portion extending horizontally, a sloping corridor portion extending obliquely upward or obliquely downward, and an ascending or descending portion disposed between the horizontal portion and the oblique corridor portion. It consists of a mouth.
[0006]
The conventional unit constituting the horizontal portion of the passage has a top portion and a bottom portion extending horizontally, and the unit constituting the oblique passage portion has a top outer surface formed of an inclined surface and a bottom outer surface formed of a horizontal surface. Further, the unit constituting the ascending mouth portion has a top inner surface comprising a slope extending upward and a bottom inner surface comprising a horizontal surface, and the unit constituting the descending portion is formed on the top inner surface and bottom comprising a horizontal surface. And a staircase that is provided and extends downward.
[0007]
Of these units, a staircase and a drainage groove are provided at the bottom of the unit that constitutes the oblique corridor, and a drainage groove is provided along with the staircase at the bottom of each unit that constitutes the exit part. However, in any unit, the open surface of the drainage groove is at a level lower than the upper end of the staircase. For this reason, the outer surface of the bottom of the unit is a horizontal plane so as to define the drainage groove, and has a relatively thick thickness. The bottom unit having a large thickness is heavier than the horizontal unit and the rising unit, and is inconvenient to handle in the installation work on the concrete surface.
[0008]
In any of the units constituting the rising port portion and the falling port portion, the height dimension between the top inner surface and the bottom inner surface gradually decreases or gradually increases in the axial direction. In addition, these units are connected to the horizontal unit and the corridor unit, respectively, so that the height dimensions at both ends thereof are the height of the opening of the horizontal unit and the oblique unit. It must match the opening height of the corridor unit. From this, the width dimension in the axial direction of the unit of the ascending opening and the descending opening is naturally determined, and the dimensions cannot be arbitrarily determined. For this reason, there is a design limitation in determining the width dimension of other units so that a plurality of units including the constituent units of the rising port portion or the descending port portion are accommodated in the concrete placing section.
[0009]
The passage further has a crossing portion that intersects at a right angle, that is, a portion that branches at a right angle and a portion that bends at a right angle. The conventional intersection includes a plurality of deformation units obtained by deforming the constituent units of the horizontal portion and reinforcing reinforcing bars. That is, it has two deformation units formed by partially cutting off one end portion of the horizontal unit, and an open end portion projecting in a V shape, which is received in the cutouts of both the deformation units. Other deformation units orthogonal to the two deformation units, a plurality of reinforcing bars arranged on the tops thereof and extending in the axial direction of the two deformation units, and a plurality of reinforcing bars orthogonal to the reinforcing bars and extending in the axial direction of the other deformation units It consists of reinforcing bars.
[0010]
In the structure of this intersecting portion, the reinforcing reinforcing bars are not orthogonal to the joint surface between the two deformation units and the other deformation units. Does not make enough contributions.
[0011]
[Problems to be solved by the invention]
The purpose of the present invention is to To provide a convenient unit for handling. Furthermore, another object of the present invention is to arbitrarily determine the length dimension in the axial direction. Able to exit Is to provide units. Furthermore, the objective of this invention is providing the structure of a corridor crossing part with high isolation | separation resistance between units.
[0012]
[Means, actions and effects for solving the problems]
In the method for installing the unit on the concrete surface according to the present invention, a precast concrete unit having a plurality of vertically movable legs and a plurality of connected members such as eyebolts is mounted on the concrete surface. It arrange | positions through the said leg. Next, the unit is fixed to the concrete surface. The fixing is performed by connecting the anchor member implanted in the concrete and the connected member to each other via a turnbuckle.
[0013]
According to the present invention, it is possible to adjust the protrusion length of the leg from the unit by moving the leg up and down, thereby facilitating the horizontal installation of the unit on the concrete surface with no land. Can be done. Moreover, the unit can be easily fixed to the concrete surface by the interconnection of the anchor member of the concrete surface and the connected member of the unit via a turnbuckle.
[0014]
The leg attached to the unit having an annular shape or a cylindrical shape and having a top portion, a bottom portion, and two side portions connected to the top portion and the bottom portion is a hole provided in a plate member embedded in the bottom portion of the unit. It is possible to include a threaded reinforcing bar piece extending in the vertical direction and meshing with a pair of nuts that are passed through the plate member and disposed above and below the plate member. The leg may be formed of a male screw member that is embedded in the bottom portion and screwed into a female screw member that penetrates the bottom portion.
[0015]
The leg made of the threaded bar piece can be fixed to the unit by tightening both nuts to the plate member, and can be moved up and down relative to the unit by loosening one of the nuts. Can do. In the leg which consists of the said external thread member, it can be moved up and down by rotating the said external thread member with respect to the said internal thread member. The male screw member can be removed from the female screw member by separating it from the concrete by rotating it after being embedded in the concrete that is struck on the concrete surface in order to construct a dam body. . The removed male screw member can be reused.
[0016]
The unit has an outer surface whose bottom part is composed of two inclined surfaces inclined downward from both sides toward the other side, an inclined surface extending in the axial direction of the corridor, and the like. be able to. According to this, when the concrete for constructing the embankment is placed after the installation of the unit, the air contained in the concrete can move upward along the inclined surface of the bottom. Thus, it is possible to prevent bubbles from accumulating in the unit. The inclination direction, the inclination angle, the number of the inclined surfaces, and the like of the inclined surface can be arbitrarily set.
[0017]
Also, because the outer surface of the bottom is inclined Compared with a conventional unit in which the outer surface of the bottom is set to be a horizontal surface, the thickness of the bottom is small, and thus the weight of the unit is small. The unit can be easily handled by reducing the weight.
[0018]
The unit according to the present invention is The top has an inner surface composed of a horizontal surface and an inclined surface inclined downward from the horizontal surface, and a staircase extending downward Have .
[0019]
This unit is the exit It is a unit which constitutes. this The unit is disposed between the horizontal part of the passage and the oblique part. By the way, The height dimension of one end that comes into contact with the top is defined by the top inclined surface and the bottom step, and the height dimension between them is constant regardless of the length in the axial direction. From this, the length of the concrete placement area for building the embankment Depending on the exit part Therefore, it is not necessary to prepare different constituent length units for the horizontal part and the cloister part which occupy the majority.
[0020]
The structural unit of the exit part is Further, the drainage groove is provided at the bottom of the drainage groove, and the drainage groove has an open surface that opens at the height of the upper end of the staircase.
[0021]
By defining the drainage groove to be opened at the height position of the upper end of the stair lift, the height position of the bottom surface of the groove can be set higher than in the prior art. The thickness dimension of the bottom where the groove is provided can be made smaller, and the weight of the unit can be further reduced.
[0022]
The unit may include an annular body that is abutted with each other and an annular water stop plate that is embedded in both annular bodies and extends from one of the annular bodies to the other.
[0023]
This unit is particularly suitable as a unit arranged across the placement sections of the concrete for building a bank body. According to this, the water stop plate embedded in both annular bodies defining the unit prevents the infiltration of the water that exudes from between the placement sections into the unit.
[0024]
The passage has a branching path (T-shaped intersection) that intersects at right angles and an intersection (L-shaped intersection) such as a right-angled bend. The present invention provides this intersection structure.
[0025]
The intersection of the present invention includes a plurality of precast concrete units connected to each other. The plurality of units include first to third units or further a fourth unit. The first unit has a pair of openings opposed to each other in the axial direction thereof. The second unit has a pair of openings opposed to each other in the axial direction thereof, and an orthogonal opening that is continuous with these openings and orthogonal to the openings. The third unit has a pair of openings opposed to each other in the axial direction thereof, and an orthogonal opening that is continuous with one of these openings and is orthogonal to the one opening. The fourth unit has a single opening that opens in the axial direction thereof, and an orthogonal opening that is continuous with the opening and orthogonal to the opening. In the T-shaped intersection, the first unit is connected to the second and third units so that one opening thereof and the orthogonal openings of the second and third units are connected to each other, and the second unit These units are connected to each other, and the third unit is connected to the second unit so that these openings are connected. In the L-shaped intersection, the second unit, the third unit, and the fourth unit are arranged so that the first unit has one opening thereof and the orthogonal openings of the second, third, and fourth units. Connected to the unit, the second unit is connected to each other, and the third and fourth units are connected to the second unit so that their openings are connected.
[0026]
Therefore, in the T-shaped intersection, the interconnection surface between the first unit and the second and third units is orthogonal to the axis of the first unit, and the second and third units The interconnection surfaces of these units are orthogonal to these axes. Also in the L-shaped intersection, the interconnection surface between the first unit and the second, third and fourth units is orthogonal to the axis of the first unit, and the second and third And the interconnection surface of the fourth unit is orthogonal to these axes.
[0027]
At least one of the top and bottom of the first unit is embedded with a reinforcing bar connecting both joints facing each other in the axial direction of the unit, and at least one of the top and bottom of the second unit is the axis of the unit. Reinforcing bars that connect both joints that are opposite to each other in the direction and other joints that are orthogonal to the reinforcing bars are embedded, and at least one of the top and bottom of the third unit is opposed to each other in the axial direction of the unit Reinforcing bars that connect both joints and reinforcing bars that are connected to and perpendicular to the reinforcing bars are embedded, and at least one of the top and bottom of the fourth unit extends in the axial direction of the unit and is fixed to the joint Reinforcing bars are embedded.
[0028]
These embedded reinforcing bars enhance the unity between each unit and the joint, and are orthogonal to the connection surface between the units, so both units connected via the joint The separation resistance is increased. Instead of embedding reinforcing bars in each unit, a plurality of reinforcing bars orthogonal to each other can be arranged on at least one of the top and bottom of these units.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIGS. 1 and 2, the passageway provided in the dam body 10 of the gravity dam is generally indicated by reference numeral 12.
[0030]
The dam body 10 is composed of a plurality of blocks 13 that are in contact with each other in the horizontal direction, that is, in the lateral direction, and each block 13 is composed of concrete that is placed in multiple times in the vertical direction.
[0031]
The illustrated passage 12 includes a plurality of horizontal portions 14 that extend horizontally, and a slant portion 16 that extends between the horizontal portions 14 having different height positions, that is, levels, and that inclines from one horizontal portion toward the other horizontal portion. And an ascending mouth 18 between each horizontal portion 14 and the lower end of each ramp 16 and a descending portion 20 between each horizontal 14 and the upper end of each ramp 16.
[0032]
The passage 12 has an intersection or intersection where the two horizontal portions 14 intersect at right angles and communicate with each other. In the illustrated example, the intersecting portion forms a part of the horizontal portion 14 at the highest position. The intersection includes a T-shaped intersection 22 that intersects the T-shape and an L-shaped intersection 24 that intersects the L-shape when viewed in plan.
[0033]
Each horizontal portion 14 excluding the intersecting portions 22 and 24 and each oblique corridor portion 16 are connected in series with a plurality of units 26 or one unit 26 connected to each other in series, that is, in the axial direction. It comprises a plurality of units 28.
[0034]
The ascending mouth 18 and the descending mouth 20 are each composed of one unit 30 and one unit 32. The unit 30 of the ascending port 18 and the unit 32 of the descending port 20 are respectively connected to these units between the horizontal unit 26 and the ramp unit 28.
[0035]
Further, the T-shaped intersection 22 has a plurality of units (first units) 33 having the same shape as the unit 26, and a plurality of units (second units) 34 and units (which are different in shape from the unit 26). The L-shaped intersection 24 is composed of a plurality of units 33, 34, and 36 and another unit (fourth unit) 38 having a shape different from that of the unit 26. . The unit at the intersection will be described in detail later.
[0036]
3, FIG. 4, FIG. 5 and FIG. 6 show the unit 26 of the horizontal section 14, the unit 28 of the ramp section 16, the unit 30 of the rising section 18, and the unit 32 of the descending section 20, respectively. Each of these units 26 to 32 has a cylindrical or annular shape as a whole and has a substantially rectangular cross-sectional shape. Each of the units 26 to 32 includes a top portion (top wall) 40 and a bottom portion (bottom wall) 42 that face each other in the vertical direction, and a pair of sides that are continuous with both portions 40 and 42 and face each other in the horizontal direction. Part (side wall) 44. Therefore, each unit has inner and outer peripheral surfaces that define each part.
[0037]
One or more joints 46 for connecting the units to each other with bolts (not shown) are embedded in the top portion 40 and the side portions 44 of each unit 26 to 32. The illustrated joint 46 is made of a rectangular steel plate provided with bolt insertion holes, one surface of which is exposed at each open end surface of each unit, and the bolt insertion holes are opened. The bolts can be inserted from a maintenance space 48 provided in each unit and opened to the outer surface of the top portion 40 or the outer surface of each side portion 44, and can be inserted into the bolt insertion holes.
[0038]
Furthermore, a plurality of support plates 50 are embedded in the bottom portions 42 of the units 26 to 32 to support the post leg. In the illustrated example, support plates 50 that are four plate members are arranged at the four corners of the rectangular bottom surface of the bottom portion 42. The support plate 50 is similarly provided in units to be described later other than these units.
[0039]
Each support plate 50 is made of an L-shaped steel plate, and one piece and the other piece of the support plate 50 are exposed at the open end face of the unit and the outer face of the bottom 42, respectively. The support plate 50 is provided with a hole 52 (FIG. 23) through which a leg 51 for supporting the unit is opened, which opens to the outer surface of the bottom 42 of the unit. The unit is provided with a care space 54 (FIG. 23) that is open to each side surface 44 and communicates with the hole 52.
[0040]
Each leg 51 consists of a threaded bar piece having a helically extending thread. A pair of nuts 55 is screwed into the threaded reinforcing bar passed through the hole 52. Both nuts 55 are arranged above and below the support plate 50 and are in contact with the support plate, whereby the threaded joint bar 51 is fixed to the support plate 50. The screw joint reinforcing bar piece 51 can change and adjust the vertical position with respect to the support plate 50 by turning both nuts 55 to change the screwing position of the nuts 55 with respect to the screw joint reinforcing bar piece 51.
[0041]
A plurality of holes for passing the legs may be provided in the bottom portion 42 of the unit instead of the above example (FIG. 7).
[0042]
Referring to FIG. 7, a plurality (four in the illustrated example) of female screw members 56 penetrating the bottom portion 42 in the vertical direction are embedded. The female screw member 56 has a thread groove on its inner surface. Moreover, the said leg consists of the rod-shaped male screw member 58 which has a screw thread, By rotating the male screw member 58, the relative position regarding the up-down direction of the said male screw member 58 with respect to the bottom part 42 of a unit can be changed.
[0043]
The details of the female screw member 56 and the male screw member 58 are shown in FIG. The male screw member 58 includes three parts 58a, 58b, and 58c that are fixed to each other by welding. The thread is provided in the hollow intermediate portion 58b, and the female screw member 56 receives the lower portion of the intermediate portion 58b of the male screw member 58 and the upper portion of the lower portion 58c thereof. The lower portion 58c of the male screw member 58 has a tapered portion that tapers downward. The male screw member 58 further has an O-ring (water blocking ring) 57 surrounding the boundary between the tapered portion and the upper portion thereof. The water stop ring 57 is in contact with the inner peripheral surface of the female screw member 56 in a state where the male screw member 58 is screwed into the female screw member 56, and prevents concrete to be placed later from entering the screw groove of the female screw member 56. It works.
[0044]
The tapered male screw member 58 can be easily pulled out from the concrete solidified material surrounding the member. More specifically, when the male screw member 58 is rotated about its axis and extracted from the female screw member 56, it is easily separated from the concrete as compared with one having no tapered portion. The extracted male screw member 58 can be reused. In FIG. 27, reference numeral 59 indicates an anchor member for the female screw member 56 embedded in the bottom 42 of the unit.
[0045]
A drainage groove 60 that opens upward is provided in each of the units 26 to 32. The groove 60 is provided in the bottom portion 42 of each unit, is close to one side portion 44 and extends in the axial direction of each unit along the side portion. The groove 60 has a unit 26 in the horizontal part 14 and a unit 30 in the rising part 18. When In this case, the unit 28 of the ramp 16 and the unit 32 of the exit 20 are horizontally extended. When Is inclined.
[0046]
Further, the unit 26 of the horizontal portion 14 and the unit 30 of the rising port portion 18 When The flat passage 61 is provided in the bottom 42 between the groove 60 and the other side 44. On the other hand, the unit 28 of the ramp 16 and the bottom 42 of the unit 32 of the exit 20 are provided. When Is provided with a stairway 62 for passage between the groove 60 and the other side portion 44.
[0047]
By the way, in the units 28 and 32 of the ramp portion 16 and the descending port portion 20, the open surface that opens upward of the drainage groove 60 is open at the height position of the upper end of the raising 64 of the stairs 62. By setting the open surface of the groove 60 to the same level as the inclined surface including the upper end of the step-up kick 64, the level of the bottom surface of the groove 60 can be set to a higher position. For this reason, the thickness dimension of the bottom portion 42 is made smaller than that of the conventional unit in which the open surface of the groove is at a lower height than the upper end of the staircase kick-up. The outer surface can be an inclined surface parallel to the inclined surface including the upper end of the kick-up 64, whereby the weight of the unit can be reduced and the handling associated therewith can be facilitated. In the illustrated example, the outer surface of the bottom portion 42 of the unit 28 in the ramp portion 16 is inclined at the same angle as the outer surface of the top portion 40 (FIG. 4).
[0048]
Referring to FIG. 3 again, each unit is provided with a rectangular groove 66 that opens to each open end face. A sealing material (not shown) can be fitted into the groove 66 in order to prevent water from entering between the two units that are connected to each other while contacting the open end face.
[0049]
Next, referring to FIG. 5, the top portion 40 of the ascending-portion unit 30 has an inner surface composed of a horizontal plane 68 and an inclined plane 70 that is continuous with the horizontal plane and is inclined upward.
[0050]
In the unit 30, one open end surface of the unit 30 defined by the horizontal plane 68 abuts on the open end surface of the unit 26 in the horizontal portion, and the other open end surface defined by the inclined surface 70 is the unit 28 of the ramp portion 16. Are connected to the units 26 and 28 so as to be in contact with the open end surface of the unit.
[0051]
According to this, the distance between the horizontal surface 68 of the top 40 and the horizontal surface 61 of the bottom 42 that defines the height dimension of the one open end surface of the unit 30 is constant with respect to the axial direction of the unit 30. Accordingly, by changing the length in the axial direction of the horizontal planes 68 and 61, a predetermined lateral length can be obtained by using a plurality of units 26 and 28 that are set in advance to have a predetermined axial length. A predetermined length of corridor can be provided in the block 13.
[0052]
In addition, the height dimension of the other open end surface of the unit 30 varies with respect to the axial direction of the unit 30, and is set to the same height dimension between the top inner surface and the bottom inner surface that defines the open end surface of the unit 28 of the ramp. Has been.
[0053]
On the other hand, the unit 32 of the descending port 20 has an inner surface composed of a horizontal surface 72 and an inclined surface 74 that is continuous with the inclined surface and is inclined downward.
[0054]
In the unit 32, one open end surface of the unit 32 defined by the horizontal plane 72 abuts on the open end surface of the unit 26 in the horizontal portion, and the other open end surface defined by the inclined surface 74 is the unit 28 of the ramp portion 16. Are connected to the units 26 and 28 so as to be in contact with the open end surface of the unit.
[0055]
According to this, the inclined surface 74 of the top 40 that defines the height dimension of one open end surface of the unit 32, and the inclined surface of the rise 64 of the staircase 62 that defines the inner surface of the bottom 42. But Since they are parallel, the distance between the inclined surface and the inclined surface 74 is constant with respect to the axial direction of the unit 32. Therefore, by changing the axial lengths of the portions of the inclined surfaces, a predetermined lateral length can be obtained by using a plurality of units 26 and 28 that are set in advance to have a predetermined axial length. A corridor of a predetermined length can be provided in the block 13.
[0056]
The height dimension of the other open end surface of the unit 32 varies with respect to the axial direction of the unit 32, and is set to be the same as the height dimension between the top inner surface and the bottom inner surface that defines the open end surface of the unit 26 in the horizontal portion. ing.
[0057]
Next, referring to FIG. 8 and FIG. 9, a unit 75 suitable for being placed across the block 13 and the block 13 constituting the bank body 10 is shown.
[0058]
The unit 75 shown in FIG. 3 has substantially the same overall shape as the unit 26 in FIG. 3, and is used as a constituent unit of the horizontal portion 14 of the corridor (the horizontal portion 14 at the lowest position) (see FIG. 1 and FIG. 1). (See FIG. 2).
[0059]
The unit 75 includes a pair of annular bodies 76 and a band-shaped water stop plate 78 having an annular shape.
[0060]
Both annular bodies 76 are abutted against each other at their open end faces. The water stop plate 78 is embedded in both annular bodies 76 and straddles them. From this, the water stop plate 78 can prevent water from entering between the two annular bodies 76 into the passageway 12.
[0061]
It is desirable that the unit 75 be kept in a non-separated state for convenience in handling at the time of delivery to the site, installation, and the like. For this purpose, the illustrated example includes a plurality of auxiliary members 82 made of angle steel in contact with the inner surfaces of both annular members 76, and bolts 84 for fixing the auxiliary members 82 to the annular members 76. . The bolt 84 passes through the auxiliary member 82 and is screwed into a cap nut 86 embedded in each annular body 76. The bolt 84 and the auxiliary material 82 are removed after the unit 75 is installed.
[0062]
Referring to FIGS. 1 and 2, a unit 88 similar to the unit 75 is disposed as a constituent unit of the ramp 16 across the blocks 13. The unit 88 has a substantially same overall shape as the unit 28 shown in FIG. 4 and includes a pair of annular bodies 90 having the same structure as the both annular bodies 76 in the unit 75.
[0063]
Next, referring to FIGS. 10, 11, 12, and 13, the first unit 33, the second unit 34, and the third unit that are constituent units of the T-shaped intersection 22 and the L-shaped intersection 24. A unit 36 and a fourth unit 38 are shown, respectively.
[0064]
As shown in FIG. 10, the first unit 33 has substantially the same shape as the unit 26 shown in FIG. 3, and has two openings 33 a facing in the axial direction, like the unit 26.
[0065]
As shown in FIG. 11, the second unit 34 differs from the unit 26 in that it does not have one of the side portions 44. Therefore, the second unit 34 has two openings 34a opposite to each other in the axial direction, and another opening 34b connected to both the openings 34a and orthogonal to the two openings 34a (hereinafter referred to as "orthogonal opening") 34b. Have
[0066]
As shown in FIG. 12, the third unit 36 differs from the unit 26 in that it has a side portion 92 that is partially cut away. For this reason, the third unit 36 has, in addition to the two openings 36a facing each other in the axial direction, another opening 36b defined by the side portion 92. The opening 36b is orthogonal to one of the two openings in the axial direction (hereinafter, the opening 36b is referred to as “orthogonal opening”).
[0067]
Further, as shown in FIG. 13, the fourth unit 38 has a shape different from that of the unit 26 in that it does not have one of the openings facing in the axial direction and one of the side portions 44. Therefore, the fourth unit 38 has a single opening 38a orthogonal to the axis thereof and an opening (hereinafter referred to as "orthogonal opening") 38b orthogonal to the opening.
[0068]
The first, second, third, and fourth units 33, 34, 36, and 38 have more joints 46 than the unit 26 as a structural difference from the unit 26. More specifically, these units have a large number of joints 46 that are embedded in the top portion 40 and are exposed at each open end surface that defines an opening other than the orthogonal opening, and are also exposed at the bottom portion 42 at each open end surface. A plurality of joints 46 are embedded.
[0069]
The second unit 34 further includes a plurality of joints 46 embedded in the top 40 and the bottom 42, respectively, and exposed at their free end surfaces.
[0070]
The third unit 36 further includes a joint 46 embedded in the top 40 and exposed to the wall surface of one side wall 92. The fourth unit 38 also has a joint 46 embedded in the top 40 and exposed at the free end of the top.
[0071]
A pair of parallel reinforcing bars 94 are embedded in the top portions 40 of the first, second and third units 33, 34 and 36. Both reinforcing bars 94 extend in the axial direction of each unit, and both end portions thereof are welded to a pair of joints 46 facing each other in the axial direction.
[0072]
Further, in addition to the two reinforcing bars 94, another pair of parallel reinforcing bars 96 are embedded in the top portions 40 of the second and third units 34 and 36. These reinforcing bars 96 extend below the two reinforcing bars 94 at right angles to them, and only one end of both reinforcing bars 96 is welded to the other joint 46. The joint 46 is exposed at the free end of the top portion 40 in the second unit 34, and is exposed on the wall surface of one side wall 92 in the third unit 36.
[0073]
Furthermore, a reinforcing bar 96 extending in the axial direction of the unit is embedded in the top 40 of the fourth unit 38. These rebars 96 are welded to a joint 46 where only one end of the rebar is exposed at the open end face defining the opening 38a.
[0074]
As the unit constituting the intersection, a unit 98 shown in FIG. 14 and a cover plate 100 shown in FIG. 15 can be further used.
[0075]
The unit 98 has substantially the same shape as the unit 26 shown in FIG. 3, and a pair of reinforcing bars 96 extending in the axial direction are embedded in the top portion 40. Further, unlike the first unit 33, a large number of joints 46 are arranged only on one open end face side, and one joint 46 is provided on the other open end face side in the same manner as the unit 26. One end of each of the reinforcing bars 96 is welded to one of the multiple joints 46. The lid plate 100 is made of a precast concrete plate, has a rectangular planar shape, and has a plurality of joints 46 that are exposed on one surface thereof. The joint 46 is disposed along three sides of the four sides of the rectangle except for one side below.
[0076]
The reinforcing bars 94 and 96 can also be disposed in the bottom 42 in the same manner as in the top 40 of the unit. The reinforcing bars 94 and 96 enhance the resistance against the tensile force acting on the joint 46 whose ends are welded.
[0077]
Referring to FIGS. 1 and 2 again, the T-shaped intersection 22 is located at the intersection of the highest level horizontal portion 14 connected to the ramp 16 and the other horizontal portion 14a, and the L-shaped intersection 24 Is at the intersection of the horizontal portion 14 and the other horizontal portion 14b.
[0078]
The horizontal part 14 shown in the figure connected to the oblique corridor is in succession to the unit 26 shown in FIG. 3 in order, a unit 98 shown in FIG. 14, a third unit 36 shown in FIG. 12, and two second parts shown in FIG. The unit 34, the third unit 36, the two units 98, the third unit 36, the two second units 34, and the fourth unit 38 shown in FIG. 13 are arranged in series and connected to each other.
[0079]
These units are connected to each other through a joint 46 that is in contact with the open end face of each unit and exposed to the open end face.
[0080]
Further, the horizontal portion 14a orthogonal to the horizontal portion 14 includes a first unit 33 (FIG. 10) connected to two third units 36 in the horizontal portion 14 and two second units 34 between the units. The unit 98 and the plurality of units 26 are arranged in series and connected to each other.
[0081]
The first unit 33 and the unit 98 are in contact with these open end faces and are exposed to one open end face of the first unit 33, and the top joint 46 to which the reinforcing bar 96 of the unit 98 is connected. And a bottom joint 46. The first unit 33 and the second and third units 34 and 36 include the other open end surface of the first unit 33 and the free ends and the first ends of the top bottom portions 40 and 42 of the second unit. A joint 46 exposed to the other open end surface of the first unit 33, a joint 46 exposed to the free end of the top bottom of the second unit 34, The third unit 36 is connected via a joint 46 exposed to the side 92 of the top of the third unit 36.
[0082]
Further, the horizontal portion 14b is connected to one third unit 36 in the horizontal portion 14, two second units 34 connected to the unit, and a fourth unit 38 connected to the second unit. The first unit 33, the unit 98, and the unit 26 are arranged and connected in series.
[0083]
The unit in the horizontal portion 14 and the fourth unit 38 adjacent to the second unit are connected via a joint 46 that is in contact with these open end faces and exposed to these open end faces. In addition, the first unit 33 and the unit 98 in the horizontal portion 14b are in contact with the open end surface of the first unit 33, and the joint 46 exposed on one open end surface of the first unit 33 is connected to the reinforcing bar 96 of the unit 98. The top joint 46 and the bottom joint 46 are connected to each other. The first unit 33 and the second, third, and fourth units 34, 36, 38 include the other open end surface of the first unit 33 and the top bottom portions 40, 42 of the second unit. A joint that contacts the free end, the side 92 of the third unit, and the free ends of the top bottom portions 40 and 42 of the fourth unit 38, and is exposed to the other open end surface of the first unit 33. 46, the joint 46 exposed at the free end of the top bottom of the second unit 34, the joint 46 exposed on the side 92 of the top of the third unit 36, and the free end of the top of the fourth unit 38. It is connected via an exposed joint 46.
[0084]
The T-shaped intersection 22 includes two units 98 in the horizontal part 14, two third units 36 between the units, two second units 34 between the third units, and the horizontal part 14a. The first unit 33 and the unit 98 are included.
[0085]
As for the second and third units 34 and 36 in the T-shaped intersection 22, the openings 34 a and 36 a facing each other in the axial direction are connected to each other, and the orthogonal openings 34 b and 36 b are connected to each other. Each unit 98 in contact with each third unit 36 has one of the openings 98a facing each other in the axial direction. so It is lined up. Further, with respect to the first unit 33, one opening 33 a in the axial direction communicates with the orthogonal openings 34 b and 36 b of the second and third units 34 and 36. The other opening 33a of the first unit is connected to one of the openings 98a in the axial direction of the unit 98 in contact with the opening. Thereby, the horizontal part 14 and the horizontal part 14a are mutually connected.
[0086]
Further, the L-shaped intersection 24 is adjacent to the unit 98 in the T-shaped intersection 22, the unit 98 in the horizontal portion 14, the fourth unit 38, two second units 34 and one first unit between these units. 3 units 36, and the first unit 33 and the unit 98 in the horizontal portion 14b.
[0087]
As for the second, third and fourth units 34, 36, 38 in the L-shaped intersection 24, the openings 34a, 36a, 38a in the axial direction are connected to each other, and these orthogonal openings 34b, 36b, 38b are connected. Are connected to each other. Further, the unit 98 of the L-shaped intersection 22 contacting the third unit 36 and the unit 98 of the T-shaped intersection 22 has both openings 98a opposed to the axial direction of the unit 98 and the T-shape of the third unit 36, respectively. It continues to the opening 98a of the unit 98 at the intersection 22. Further, with respect to the first unit 33, one opening 33a in the axial direction communicates with the orthogonal openings 34b, 36b, 38b of the second, third, and fourth units 34, 36, 38. The other opening 33a of the first unit is connected to one of the openings 98a in the axial direction of the unit 98 in contact with the opening. Thereby, the horizontal part 14 or the T-shaped intersection part 22 and the horizontal part 14b communicate with each other. One opening of the unit 26 at the tip of the horizontal portion 14 b is covered with the cover plate 100. The unit 26 and the lid plate 100 are also connected to each other via a joint 46 exposed on their opposing surfaces.
[0088]
In any of the T-shaped intersection portion 22 and the L-shaped intersection portion 24, the mutual joint surfaces of the units constituting this are orthogonal to the axes of these units, and the reinforcing bars embedded in these component units 94 and 96 are orthogonal to the mutual joint surface. For this reason, at these intersecting portions, the resistance force to the external force in the axial direction of the units that separates the units from each other is high. For this reason, the intersection has a large structural strength.
[0089]
Referring to FIG. 16, instead of embedding the reinforcing bars 94 and 96 in the unit, two sets of a plurality of reinforcing bars 102 extending in the axial direction of the horizontal portion 14 above or below the constituent unit of the horizontal portion 14. Furthermore, a plurality of reinforcing bars 104, 106 extending in the axial direction thereof, that is, perpendicular to the reinforcing bars 102, may be arranged above or below the constituent units of the orthogonal horizontal portions 14a, 14b. . However, the shape of each unit constituting the T-shaped intersection 22 and the L-shaped intersection 24 is the same as described above. Further, the number of joints 46 provided in these units can be smaller than that in the aforementioned units.
[0090]
These reinforcing bars 102, 104, and 106 are buried in the concrete of the dam body 10, and serve to reinforce the mutual units at the intersections integrated with the concrete, that is, to increase the joint strength between the units.
[0091]
All the above-mentioned units can be installed on the block 13 which is a part of the embankment 10 under construction as follows.
[0092]
Referring to FIG. 17 to FIG. 21 showing the installation process of the unit 26 as a representative, after the legs 51 are attached to the support plate 50 (see FIG. 23) of the bottom portion 42 of the unit 26, the unit 26 is used with a crane (not shown). Is suspended and placed on the block 13 (FIGS. 17 and 18).
[0093]
The unit 26 placed on the block 13 via the plurality of legs 51 turns the nut 55 to change the screwing position between the nut and the leg 51 according to the degree of unevenness of the surface of the block 13. Thus, it can be maintained at a predetermined height position and horizontally. Reference numerals 108 and 110 denote a U-shaped jig used for hanging the unit 26 by the crane and a wire for hanging the jig. Prior to suspending, pins 112 passing through the jig 108 and holes (not shown) provided on both sides of the unit 26 are inserted.
[0094]
The unit 26 is disposed between two pairs of anchor members 114 previously implanted in the block 13. The anchor member 114 has an inverted U shape as a whole, and its curved portion protrudes above the block 13.
[0095]
Thereafter, a pair of eyebolts 116 that are members to be connected are screwed into a pair of inserts (not shown) embedded in advance in the respective side portions 44 of the unit 26 and attached to the unit 26. The eyebolt 116 may be attached before the unit 26 is placed on the block 13.
[0096]
Next, after removing the jig 108 and the wire 110, hooks at both ends of the turnbuckle 118 are hooked on each anchor member 114 and each eyebolt 116. The unit 26 is firmly fixed to the block 13 by the tightening operation of each turnbuckle 118. The pair of turnbuckles 118 are arranged so as to cross each other (see FIG. 22). Thereby, the movement to the horizontal direction of the unit 26 can be restrained. The turnbuckle 118 has a variable length and can be arranged in an attitude or angle according to the arrangement position of the anchor member 114 and the eyebolt 116, so that the unit 26 can be easily fixed to the block 13. And does not require an exact alignment of the anchor members 114, so that the anchor members 114 can be installed relatively easily.
[0097]
Thereafter, concrete 120 is placed under and around the unit 26. The concrete 120 struck on the block 13 is later solidified to form a part of the dam body 10.
[0098]
When the lower part 42 of the unit 26 is filled with the concrete 120, the upper part 124 having a hook hooked to the other part, that is, the eyebolt 116, leaving a part 122 of the turnbuckle 118 buried in the concrete 120; The intermediate part 126 screwed onto the upper part is removed. These other parts can be reused. Thereafter, concrete 128 is further placed on the concrete 120.
[0099]
Referring to FIGS. 24 and 25, the case where the component unit 28 of the ramp portion 18 is installed is shown.
[0100]
Since the outer surface of the bottom portion 42 of the unit 28 is inclined, the length of the leg 51 below the unit 28 is set to be long or short. Thereby, the unit 28 is maintained at a predetermined height position. In installing the unit 28, the anchor member 114 is implanted in the surrounding concrete 120 around the lower part of the unit 28 installed previously. The unit 28 is then installed on the block 13, more precisely on the concrete 120 as in the unit 26.
[0101]
Referring again to FIG. 3, the lower portion 42 of the unit 26 is preferably provided with a plurality of holes 130 for venting air in the cast concrete that wraps around the unit 26. Other units having a horizontal bottom outer surface can also be provided with such holes 130.
[0102]
Furthermore, a plurality of pipe members 132 are embedded in the lower part 42 of the unit so as to penetrate the lower part in the vertical direction. These pipe members 132 are used to construct a curtain grout from the inside of the corridor into the ground at the bottom of the dam after the corridor is installed. That is, it is possible to perform boring from the tube member 132 and to inject grout into the boring hole through the tube member 132 later. Details of the pipe member 132 are shown in FIG. The tube member 132 is made of steel, and a screw groove 134 is provided on the inner peripheral surface of the top portion. The top opening of the tube member 132 is closed by a plug 136 screwed into the thread groove 134. Reference numeral 138 denotes an anchor member for the tube member 132 that is embedded in the bottom 42 of the unit. By embedding the pipe member 132 in the bottom portion 42 in advance, the following advantages can be obtained compared to the case of non-embedding. In the case of non-embedding, the construction of the curtain grout is performed by making a hole in the bottom part 42 of the unit. At this time, the reinforcing bar in the unit is damaged or cut, which may cause a structural weak point. . By burying the tube member 132 in advance, such a structural weakness will not occur in the future.
[0103]
Referring to FIG. 3 again, it is preferable that an embedded metal 140 is embedded in the upper portion 40 of the unit. After the installation of the corridor is completed, the embedded metal fitting 140 is used to arrange a rail holding metal fitting for a monorail for moving people and goods inside the corridor in the corridor.
[0104]
Further, as shown in FIG. 26, the outer surface of the bottom portion 42 of the unit 26 is directed to one side differently from the both side portions 44 of the unit so that the air in the concrete 120 under the unit 26 can be guided upward. The two inclined surfaces 133 can be inclined downward. Instead of providing both inclined surfaces, for example, it can be a bottom outer surface composed of one inclined surface inclined with respect to the axial direction of the passageway.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a corridor in a bank body.
FIG. 2 is a schematic plan view of a corridor in a bank body.
FIG. 3 is a perspective view of a constituent unit of a horizontal part of a corridor.
FIG. 4 is a perspective view of a constituent unit of a ramp portion of a corridor.
FIG. 5 is a perspective view of a constituent unit of a rising part of a corridor.
FIG. 6 is a perspective view of a constituent unit of the exit part of the corridor.
FIG. 7 is a perspective view of another example of the horizontal unit.
FIG. 8 is a front view of a structural unit of a horizontal portion arranged across two blocks constituting the bank body.
FIG. 9 is a longitudinal sectional view taken along line 9-9 of FIG.
FIG. 10 is a perspective view of the first unit at the intersection of the corridor.
FIG. 11 is a perspective view of a second unit.
FIG. 12 is a perspective view of a third unit.
FIG. 13 is a perspective view of a fourth unit.
FIG. 14 is a perspective view of another unit suitable for placement at the intersection.
FIG. 15 is a perspective view of a cover plate used to form a dead end of a corridor.
FIG. 16 is a plan view of another example of an intersection.
FIG. 17 is an explanatory diagram showing a state in which the unit is suspended.
FIG. 18 is an explanatory diagram showing a state where a unit is placed on a block.
FIG. 19 is an explanatory diagram showing a state in which a unit is fixed to a block.
FIG. 20 is an explanatory view showing a state in which concrete is placed on a block.
FIG. 21 is an explanatory diagram showing a state in which a part of the unit is embedded in concrete.
FIG. 22 is a side view of the unit fixed to the block.
FIG. 23 is a partially enlarged side view of the bottom of the unit.
FIG. 24 is a perspective view showing a state in which the constituent unit of the ramp portion is suspended.
FIG. 25 is a perspective view showing a state in which the configuration unit of the ramp portion is placed on the block.
FIG. 26 is a front view of a unit having a bottom outer surface composed of two inclined surfaces.
FIG. 27 is an enlarged longitudinal sectional view of another example of the leg of the unit.
FIG. 28 is an enlarged perspective view of a pipe member embedded in the bottom of the unit.
[Explanation of symbols]
10 Embankment
12 corridors
13 blocks (Building dike)
14, 14a, 14b The horizontal part of the corridor
16, 18, 20 The corridor of the corridor, ascending and descending parts
22, 24 T-shaped intersection and L-shaped intersection
26, 28, 30, 32, 98 units
33, 34, 36, 38 First, second, third and fourth units at the intersection
40, 42, 44 Unit top, bottom and sides
46 fittings
50 Support plate
51,58 legs
60,62 Drainage grooves and stairs
76,90 ring
Reinforcing bars embedded in 94,96 units
114 Anchor member
116 eyebolt (member to be connected)
118 Turnbuckle

Claims (10)

A unit made of precast concrete used to form a corridor provided in a dam body of a concrete dam, wherein the top part, the bottom part, two side parts connected to the top part and the bottom part, and the bottom part move up and down. A plurality of legs attached to each other, and connected members attached to the respective sides;
The unit, wherein the top portion has an inner surface composed of a horizontal surface and an inclined surface inclined downward from the horizontal surface, and the bottom portion includes a staircase inclined downward.   The leg is composed of a threaded reinforcing bar piece extending in a vertical direction, which is passed through a hole provided in a plate member embedded in the bottom portion and meshes with a pair of nuts arranged above and below the plate member. The unit described in.   The unit according to claim 1, wherein the leg includes a male screw member that is embedded in the bottom portion and screwed into a female screw member that penetrates the bottom portion.   The unit of claim 1, wherein the bottom has an outer surface including an inclined surface.   2. The unit according to claim 1, comprising a drainage groove provided in the bottom, the drainage groove having an open surface that opens at a height position of an upper end of the staircase.   2. The unit according to claim 1, comprising: an annular body abutted against each other; and an annular water stop plate embedded in both annular bodies and extending from one of the annular bodies to the other.   A structure of a crossing portion of a corridor provided in a dam body of a concrete dam, including a plurality of precast concrete units having a plurality of joints and connected to each other through the joints, wherein the unit is in an axial direction A first unit having a pair of openings opposed to each other, a pair of openings opposed to each other in the axial direction, and a plurality of second units connected to both of the openings and orthogonal to each other And a plurality of third units having a pair of openings opposed to each other in the axial direction and a plurality of third units connected to one of the two openings and perpendicular to the one of the openings. Are connected to the second and third units so that the orthogonal openings of the second and third units are connected to each other, and the second and third units are connected to each other. These openings are connected to each other so as to communicate with each other, and the first unit includes a reinforcing bar that is embedded in at least one of the top and bottom of the unit and connects both joints facing each other in the axial direction of the unit. The second unit has a reinforcing bar that is embedded in at least one of its top and bottom and connects both joints facing each other in the axial direction of the unit, and a reinforcing bar that is fixed to another joint and orthogonal to the reinforcing bar, The third unit has a reinforcing bar that is embedded in at least one of the top and bottom of the unit and that connects the joints opposite to each other of the unit, and a reinforcing bar that is fixed to the other joint and orthogonal to the reinforcing bar. The structure of the intersection.   A structure of a crossing portion of a corridor provided in a dam body of a concrete dam, including a plurality of precast concrete units having a plurality of joints and connected to each other through the joints, wherein the unit is in an axial direction A first unit having a pair of openings opposed to each other, a pair of openings opposed to each other in the axial direction, and a plurality of second units connected to both of the openings and orthogonal to each other A third unit having a pair of openings facing each other and an orthogonal opening that is connected to one of the two openings and orthogonal to the one opening, a single opening that opens in the axial direction, and the opening A fourth unit having an orthogonal opening orthogonal to the opening, wherein the first unit includes one of the openings and the orthogonal openings of the second, third, and fourth units. The second unit is connected to the second unit, the third unit, and the fourth unit to be connected, the second unit is connected to each other, and the third unit is connected to the second unit, One unit has a reinforcing bar that is embedded in at least one of its top and bottom and connects both joints facing each other in the axial direction of the unit, and the second unit is embedded in at least one of its top and bottom The third unit has a reinforcing bar connecting the two joints facing each other in the axial direction of the unit and a reinforcing bar fixed to the other joint and perpendicular to the reinforcing bar, and the third unit is embedded in at least one of the top and bottom of the reinforcing bar. A reinforcing bar connecting the joints facing each other and a reinforcing bar fixed to the other joint and perpendicular to the reinforcing bar, and the fourth unit includes Parts and bottom of a rebar extending axially of the unit is fixed to the coupling of the embedded the unit to at least one, the structure of the intersection of the corridor.   A structure of a crossing part of a corridor provided in a dam body of a concrete dam, which is arranged on a plurality of precast concrete units connected to each other and at least one of the top and bottom of these units and orthogonal to each other The unit includes a plurality of reinforcing bars, and the unit includes a first unit having a pair of openings opposed to each other in the axial direction, a pair of openings opposed to each other in the axial direction, and both the openings, and orthogonal to the openings. A plurality of second units having orthogonal openings, and a plurality of third units having a pair of openings facing each other and one of these openings and having an orthogonal opening orthogonal to the one opening, The first unit is connected to the second and third units so that one opening thereof is connected to the orthogonal openings of the second and third units. Is sintered, also the second and third units, the openings are connected to each other so as to communicate, the structure of the intersection of the corridor.   A structure of a crossing part of a corridor provided in a dam body of a concrete dam, which is arranged on a plurality of precast concrete units connected to each other and at least one of the top and bottom of these units and orthogonal to each other The unit includes a plurality of reinforcing bars, and the unit includes a first unit having a pair of openings opposed to each other in the axial direction, a pair of openings opposed to each other in the axial direction, and both the openings, and orthogonal to the openings. A plurality of second units having orthogonal openings, a pair of openings opposed to each other in the axial direction, a third unit connected to one of these openings and orthogonal to the one opening, and the axial direction And a fourth unit having an orthogonal opening that is continuous with and orthogonal to the opening. Is connected to the second, third, and fourth units so that one opening thereof and the orthogonal openings of the second, third, and fourth units are connected to each other, and the second unit is connected to each other. And the structure of the intersection of the corridors, wherein the third and fourth units are connected to the second unit.

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