JP2009275359A - Box culvert with oblique angle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a box culvert with an oblique angle, which enables a uniform tension to be applied to an end surface of an anchoring portion, when it is tightened in a connecting direction, and which prevents an end surface of a joint of the box culvert from being displaced by sliding. <P>SOLUTION: This box culvert with the oblique angle is formed by inclining the end surface 10 of the joint with respect to an axis line (b) orthogonal to an connecting-direction axis line (a). Structurally, the end surface 8 of the anchoring portion, which is composed of a tendon including its sidewall 1, is formed as a vertical plane orthogonal to the direction of the arrangement of the tendon. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a bevel box culvert, and more particularly to an bevel box culvert that is optimal for use in constructing a bevel crossing bridge that obliquely intersects a waterway or road.

Conventionally, at construction sites where waterways and roads or roads and roads intersect three-dimensionally at right angles, normal plan view is installed with rectangular gate-shaped blocks or culvert blocks, and a right-angle straddling the lower waterways or roads at right angles A cross-link is formed.

However, as shown in FIG. 5, in the case of constructing an oblique crossing bridge S that obliquely intersects the direction of the existing waterway or road W on the extension line of the roads R ₁ and R ₂ , a normal plane A gate-shaped block or culvert block 20 having a rectangular shape is arranged along an axis a (hereinafter referred to as a horizontal axis a) in the connecting direction, and the left end and the right end are shown in FIGS. End surface 21 facing outward
A block 21 having an inclination angle θ with an axis b (hereinafter referred to as a vertical axis b) orthogonal to the horizontal axis a is formed by spot placement, or the partition plate is fixed at a predetermined inclination angle θ in advance. A block 21 formed by cutting a block formed by the above-mentioned mold or the rectangular block 20 in plan view with a wire saw or the like at an inclination angle θ is used.

At the time of construction, an intermediate portion of the bridge S crossing the oblique angle uses a gate-type block or a culvert block 20 having a rectangular shape in a normal plan view, and one end surface facing the outside at the left end portion and the right end portion is the vertical axis b.
And the blocks 21 having the inclined end faces 21a intersecting at the inclination angle θ, respectively. That is, at the construction site, a plurality of portal blocks or culvert blocks 20 are arranged in parallel, and the blocks 21 are respectively arranged on the left end side and the right end side thereof.

Next, the PC steel rod 11 is inserted into a through-hole along the horizontal axis a formed in the fixing portion of each of the blocks 20 and 21, and one end of the PC steel rod 11 is pulled with a jack or the like to apply a tension force. In this construction, the front and rear pair of L-shaped side walls 21A and 21B having different widths and a gate-shaped top plate are fixed. While it is necessary to use each block of 21C, the block 21 installed at the left end and the right end has various problems as described below in terms of structure and manufacturing.

That is, the end surfaces 21a of both blocks 21 and the end surfaces 22a, 22b of the L-shaped side walls 21A, 21B installed at the left end portion and the right end portion are not vertical surfaces orthogonal to the horizontal axis a in the block connecting direction. More specifically, the end surface 21a of the block 21 and the L-shaped side walls 21A, 2
The end faces 22a and 22b of 1B are respectively formed by inclined surfaces that form an inclination angle θ with the vertical axis b orthogonal to the horizontal axis a in the connecting direction. Therefore, when one end of the PC steel bar 11 is pulled and tensioned with a jack, it is difficult to take the reaction force of the jack with the inclined end surfaces 21a, 22a, and 22b, and an equal prestress is applied to the entire end surfaces of the blocks 21 and 20. Cannot be granted.

In order to cope with such problems, conventionally, the inclined end surfaces 21a and 22 of the block 21 are used.
A jack 22 is formed in a and 22b, and a jack perpendicular to the axis of the PC steel rod 11 (in the figure, the horizontal axis a in the connecting direction of the blocks) is formed at the bottom of the recess 23. Forming the vertical jack reaction force surface 23a for attachment is performed.

However, a vertical jack reaction force surface 23a orthogonal to the arrangement axis of the PC steel rod 11 is provided at the bottom of the recess 23 in this portion having a small width (the lower end portion or the lower end portion or the block 21 at the left end portion or the right end portion). In order to form this portion at the upper end portion and to make this portion the fixing portion 21b, the structural strength (small thickness,
There is a problem in terms of a small amount of internal reinforcement), and when the tension is applied to the PC steel rod 11 by the jack in the recess 23, there is a possibility that the fixing portion cracks from the periphery of the recess 23.

Further, as a manufacturing problem, there is a problem that, in order to form the block 21 by on-site placement, adjustment work at the site is difficult and work time becomes long. Such a problem is the same when the block 21 having a rectangular shape in plan view is obliquely cut with a wire saw or the like to form the block 21. Furthermore, there are many problems in designing and manufacturing management even when the partition plate is molded in advance by a mold frame fixed at a predetermined inclination angle θ.

Therefore, in order to solve the above-described problems, it is also conceivable to form a cross-bevel crossing bridge S by precasting all the constituent members and using only one type of bevel box culvert. For example, as shown in FIG. 7, the plan view formed by inclining (inclination angle θ) the left and right joint end faces 24a of the block 24 with respect to the axis b orthogonal to the axis a in the box culvert connection direction is a parallelogram. The bevel box culvert 24 of FIG.

By adopting the above configuration, there is an advantage that all the crossing bridges S of the bevel can be constructed with one kind of precast bevel box culvert 24. However, since the joining portion end surface 24a serving as the fixing portion made of the tension material including the side wall is inclined (inclination angle θ) with respect to the vertical axis b, the fixing portion 21b of the block 21 shown in FIGS. Similarly to the end surface 21b, a recess 23 for jack attachment is formed on the inclined end surface 24a of the block 24, and the bottom wall of the recess is orthogonal to the axis of the PC steel rod 11 (axis line a in the connecting direction). Reaction surface 2 for jack mounting
3a needs to be formed, and the conventional problems as described above remain.

Furthermore, in the case of using the blocks 24 and 24 having the above-described configuration to construct the crossing S crossing the oblique angle, it is possible to arrange a plurality of them in parallel while joining the joint end faces 24a. Further, when the PC steel rod 11 is inserted into a through hole formed in the fixing portion of each block 24 along the axis a in the connecting direction and one end of the PC steel rod 11 is pulled with a jack or the like to apply tension. ,
Since the joint portions of the respective blocks 24 and 24 face each other at the inclined end surface 24a, the joint portion end surfaces 24a and 24a slide and cause misalignment when it is difficult to apply equal tension to each other. There is a problem.

The present invention has been made to solve the conventional problems as described above, and is formed by forming the end face of the fixing portion including the side wall in a plane perpendicular to the connecting direction of the oblique box culvert. When tightening in the direction, even tension can be applied to the end face of the fixing part, and even when applying tension, the box culvert where the joint end face of the box culvert does not slide and shift. Is intended to provide.

In order to solve the above-mentioned object, the first invention according to claim 1 of the present application is an oblique box culvert formed by inclining a joint end face of a box culvert with respect to an axis perpendicular to the axis in the connecting direction, The end face of the fixing portion by the tension material including the side wall of the oblique box culvert,
It was formed in the perpendicular | vertical surface orthogonal to the arrangement | positioning direction of the said tension material.

In order to achieve the above object, according to a second aspect of the present invention, the oblique box culvert includes a pair of L-shaped side walls including a side wall portion and a bottom wall forming portion, and fixing in the vicinity of both end portions. It is characterized in that it is a split type consisting of a top plate of a top plate portion formed of a top plate portion formed between the center portion and both fixing portions and an end surface of the joint portion inclined with respect to an axis perpendicular to the axis of the box culvert in the connecting direction. To do.

Furthermore, in order to achieve the above object, the third invention of the present application is characterized in that a plurality of internal reinforcing bars protrude horizontally and parallel to the protruding side end surface of the bottom wall forming portion of the side wall, The fourth invention of the present application is characterized in that an inclination angle of an end face of the left and right joint portion with respect to an axis orthogonal to a connecting direction of a box culvert is within 30 degrees.

As described above, when the prestressed is introduced by pulling the PC steel rod through which the oblique box culvert is inserted into the through hole of the fixing unit, the end surface of the fixing unit including the side wall is Since it is formed with a surface perpendicular to the connecting direction of the oblique box culvert, the end surface of the joint portion of the box culvert slides in addition to being able to apply an even tension to the end surface of the fixing portion. A bevel box culvert that does not shift can be provided.

In addition, as described above, in the invention according to claim 2, the pair of L-shaped side walls that are installed facing each other in the front-rear direction are the width length and the oblique angle of the portal-type top plate that is installed thereon. Since it is not affected by the angle, it can be used as a common member between blocks installed in different places. And as mentioned above, by setting it as the invention which concerns on Claim 3, the integrity of the baseplate part and side wall which are hit in the field is securable.

Further, by defining the range of the angle of the intersection that can be normally constructed by setting the invention according to claim 4, in the form plate for the top plate described later, the movable cradle procured according to the oblique angle, Standardization of small-sized plates can be achieved.

Hereinafter, the present invention will be described in detail based on the embodiment shown in FIGS. 1 and 2
, A is an oblique box culvert having a frontal gait type, which is an L-shaped side wall 1, 1 that is opposed to the left and right sides, and the side wall 1 that is obliquely mounted on both side walls 1, 1. , 1 and a top plate 5 integrated therewith. The side wall 1 is composed of a side wall portion 2 which is a constituent part thereof, and a bottom wall forming portion 3 which horizontally protrudes inward from the lower end of the side wall portion 2, and from the protruding side end surface of the bottom wall forming portion 3. The tip of the reinforcing bar 4 disposed inside protrudes in a parallel state.

The top plate 5 is a portion that becomes a bridge S constructed on a waterway or a road W, a central top wall portion 6 that is a portion that crosses the water channel or the road W at an oblique angle, and a top wall portion 6 of the top wall portion 6. The joint portion end face 10 of the top wall portion 6 is connected to an axis a (hereinafter referred to as a horizontal line) in the connecting direction of the box culvert A, as shown in FIGS. An inclined surface inclined by a predetermined angle θ with respect to a vertical axis b (hereinafter referred to as a vertical axis b) orthogonal to the axis a), that is, an inclined surface in the same direction as the extended lines of the roads R ₁ and R ₂ It is formed with.

Reference numeral 8 denotes left and right end surfaces of the fixing unit 7, and the end surface 8 of the fixing unit 7 is a vertical axis perpendicular to the axis (horizontal axis) a in the connecting direction of the box culvert A, as shown in FIGS. (Vertical axis) When formed with a vertical plane in the same direction as b, that is, a vertical plane orthogonal to the arrangement direction of the PC steel rod 11 to be described later, it is continuous with the end surface 8 of the vertical fixing portion. The end surface 1A of the side wall 1 is also formed as a vertical surface in the same direction as the vertical axis b, similarly to the end surface 8 of the fixing unit 7. In the figure, reference numeral 12 denotes a through hole along the axis a in the connecting direction of the box culvert A.
Formed on the end surface 8 of the fixing portion of the top plate 5 and the end surface 1A of the fixing portion of the side wall 1, the PC steel rod 11 is inserted into the through hole 12.

Therefore, the gate-shaped oblique box culvert A having the integral structure shown in FIG. 2 is used, and the obliquely crossing bridge S that obliquely intersects the direction of the existing waterway or road W is set to the road R. ₁ ,
When building on the extension line of R ₂ , the bevel box culverts A are arranged in parallel by the number corresponding to the widths of the roads R ₁ and R ₂ , and the joint end faces 10 of the adjacent top walls 6 are arranged. 10 and the end surfaces 8 and 8 of the fixing unit 7 and the end surface 1A of the side wall 1 serving as the fixing unit are brought into contact with each other.

Next, a PC steel rod 11 is inserted into each through hole 12 along the axis a in the connecting direction of the box culvert A formed on the end surface 8 of the fixing portion of each block A, A and the left and right end surfaces 1A of the side wall 1. Then, one end of the PC steel bar 11 is pulled with a jack or the like to apply tension to the PC steel bar 11, whereby the entire blocks A and A are connected and fixed together via the PC steel bar 11.

As a result, as shown in FIG. 4, the top plate 5 is a bridge S constructed on a waterway or road W. Then, concrete is placed through a reinforcing bar (not shown) installed between the bottom wall forming portions 3 and 3 to form a bottom wall (not shown), and the upper surface of the bottom wall is used as a waterway or a road W. Will do.

Here, the end face 8 of the fixing portion 7 and the left and right end faces 1A of the side wall 1 that are jack reaction force surfaces when pulling one end of the PC steel rod 11 with a jack or the like are perpendicular to the connecting direction of the oblique box culvert A, respectively. Since it is formed by a surface, the joint end face 10 that is inclined even when a tension force is applied to the PC steel rod 11 is easily applied to the fixing part end faces 8 and 1A. , 10 do not slide and shift.

FIG. 3 shows another embodiment of a bevel box culvert according to the present invention, which is arranged at a pair of front and rear L-shaped side walls and the upper end portion of the L-shaped side walls, and is fixed integrally through a fixing member. This is a split bevel box culvert B composed of a top plate. More specifically, the split-type oblique box culvert B includes an L-shaped side wall 1, 1 including the side wall portion 2 and the bottom wall forming portion 3, and the pair of L
The mold side walls 1 and 1 are shifted in the left-right direction so as to face each other, and a gate-shaped top plate 5 is obliquely installed on the upper ends of the side wall parts 2 and 2. The hanging portion 5 a hanging from both ends of the top plate 5 and the upper end portions of the side wall portions 2 and 2 are integrally connected via a connecting member 13. About another structure and construction method, it is the same as that of the integral bevel box culvert A shown in the said FIG.

It is an explanatory top view which shows the construction state of the bridge | crosslinking of an oblique angle constructed | assembled using the oblique angle box culvert concerning this invention. It is a perspective view of the bevel box culvert. It is a perspective view of other embodiments of the bevel box culvert. It is a whole perspective view of bridge constructed using the bevel box culvert. It is a description top view which shows the construction state of the bridge | crosslinking of the oblique crossing constructed | assembled using the conventional box culvert. It is a description partial perspective view of bridge | crosslinking shown in FIG. It is an explanatory top view which shows the construction state of the bridge of the crossing bevel constructed entirely by the bevel box culvert.

Explanation of symbols

A. Integrated bevel box culvert B Separate-type bevel box culvert 1 Side wall 1A Side wall end face 2 Side wall part 3 Bottom wall forming part 4 Reinforcing bar 5 Top plate 6 Top wall part 7 Fixing part 8 Fixing part end face 10 Joining part end face 11 PC steel rod 12 Through hole a Axis of connection direction b Vertical axis perpendicular to the axis of connection direction

Claims (4)

  A bevel box culvert formed by inclining a joint end face of a box culvert with respect to an axis perpendicular to the axis of the connecting direction, wherein the end face of the fixing portion by a tension member including a side wall of the bevel box culvert is A bevel box culvert formed on a vertical plane perpendicular to the material arrangement direction.   The bevel box culvert is between a pair of L-shaped side walls composed of a side wall portion and a bottom wall forming portion, a fixing portion in the vicinity of both end portions, and both fixing portions, and an end surface of the joint portion is orthogonal to an axis in the connecting direction of the box culvert 2. The oblique box culvert according to claim 1, wherein the oblique box culvert is divided into a gate-shaped top plate formed of a top plate portion inclined with respect to the axis.   3. The oblique box culvert according to claim 2, wherein a plurality of internal reinforcing bars project horizontally and in parallel on the projecting side end face of the bottom wall forming portion of the side wall.   4. The oblique box culvert according to claim 1, wherein an inclination angle of a joint end face of the top plate portion is within 30 degrees.

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