JP2007231600A - Portal culvert - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portal culvert which can limit displacement of lower edges of respective side plates in a culvert span direction, and contributes to shortening of a construction period and reduction of labor. <P>SOLUTION: According to the structure of the portal culvert, piles 7 are driven into excavation target ground 6, and foundation concrete blocks 8 which are coupled to the piles 7 in a manner protruding heads 7a of the piles 7, respectively, are cast in place, followed by mounting precast concrete footing portions 4 of the portal culvert 1 on the foundation concrete blocks 8, respectively. Each footing portion 4 has a connection hole 5 bored therein, which has an inner dimension larger than the outer dimension of the head 7a of the pile 7, and the head 7a of the pile 7 is inserted into the pile connection hole 5, followed by filling a gap between the connection hole and the pile head with concrete or mortar 10 cast in place. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portal culvert used mainly for underground concrete structures such as road sewers, elevated railway sewers, underground passages and the like.

  As shown in FIG. 5 (a), a concrete box culvert 51 having a cross-sectional mouth structure is constructed on an existing river in order to install a bottom slab 52 below the river R when constructed on the river R. It is necessary to take measures such as turning R around.

  On the other hand, as shown in FIG. 5 (b), the concrete portal culvert 61 having a sectional portal structure does not have a bottom plate portion. It is a construction method that does not require cutting and is friendly to the natural environment. On the other hand, when the foundation of the portal culvert is not solid due to the structure without the bottom plate, the bottom end of both sides of the plate is in the culvert span direction (horizontal direction where they are separated from each other or close to each other) ) May be displaced. Therefore, the portal culvert needs to have a solid foundation. If the foundation is not solid, the member thickness of the portal culvert must be increased, which is uneconomical. In addition, depending on the conditions of the foundation, it may not be a portal type.

  The portal culvert 61 shown in FIG. 5B is an integral type made of cast-in-place concrete. That is, the pile 67 is driven into the excavated ground 66 and the foundation concrete 68 to be joined to the pile 67 is placed so that the head 67 a of the pile 67 protrudes, and the upper plate portion 62 and both sides are placed on the foundation concrete 68. A portal culvert 61 composed of a plate part 63 and both footing parts 64 is cast in-situ and integrally formed, and a head 67a of a pile 67 is embedded in the footing part 64 and constructed. In the portal culvert 61, the upper part of the side plate part 63 is integrated with the upper plate part 62, and the footing part 64 is integrated with the pile 67 and the foundation concrete 68. The displacement in the direction of the culvert between the parts can be limited. However, it takes a lot of work and labor to hit the portal culvert 61 on site.

  Therefore, in order to reduce the work period and labor, as in the split type portal culvert 71 shown in FIG. 5 (c), the upper plate portion 72 is made of precast concrete and is separated from the side plate portion 73 and The footing part 74 is made of separate left and right precast concrete, and the pile 77 is driven into the excavation ground 76, and the foundation concrete 78 joined to the pile 77 is placed so that the head of the pile 77 does not protrude. A construction method in which the footing part 74 is installed on the upper side and the upper plate part 72 is connected to the both side plate parts 73 can be considered. However, since the footing part 74, the pile 77, and the foundation concrete 78 are not integrated, the displacement in the culvert span direction cannot be limited.

Patent Document 1 discloses a split-type portal culvert 81 as shown in FIG. That is, the upper member 82 is made of precast concrete, separate from the two members 83 is made of precast concrete, both footing parts 84 are made of cast-in-place concrete, and a foundation pile 85 is buried below if necessary. An example has been described. According to this embodiment, the displacement in the culvert span direction can be limited to some extent, and the work period can be shortened somewhat, but it takes a work period and labor to hit both footings 84 in the field.
JP 2004-44300 A

  An object of the present invention is to provide a portal culvert that solves the above-described problems, can limit the displacement of the lower end portions of the both side plate portions in the culvert span direction, and can reduce the construction time and labor. is there.

  In order to solve the above-mentioned problems, the portal culvert of the present invention has a pile driven into the excavated ground and foundation concrete that is joined to the pile so as to project the head of the pile. A foot-shaped culvert footing part made of precast concrete is placed on the foundation concrete, and the head of the pile is inserted into a connecting hole penetrating through the footing part and connected thereto.

Here, the portal culvert may be any of the following modes.
(A) A mode in which the upper plate part, both side plate parts, and both footing parts are integrally formed of precast concrete (b) The upper plate part is made of precast concrete, and is separate from the side plate part and footing. Aspect that the part is made of separate left and right precast concrete

  Further, the footing part may extend horizontally from the lower end of the side plate part to the inside of the culvert, or may extend horizontally to the outside of the culvert.

  In terms of connection workability and strength, the connecting hole is formed with an inner dimension larger than the outer dimension of the head of the pile (during precast), and the gap between the connecting hole and the head of the pile (entering it) is concrete or It is preferable that the mortar is bonded in place. The shape of the connecting hole is not particularly limited, and may be a square hole or a round hole, for example. Moreover, although the inner surface of a connection hole may be flat, it is preferable to form the convex part or recessed part which engages with this concrete or mortar, and to prevent the concrete or mortar from coming off. The length of the head of the pile entering the connecting hole is not particularly limited, but is preferably 5 cm or more, and more preferably 10 cm or more.

  The usage of the portal culvert is not particularly limited, and examples thereof include various concrete structures such as a road sewer, an elevated railway sewer, and a pedestrian underground passage.

  As described in detail above, according to the portal culvert according to the present invention, it is possible to limit the displacement in the culvert span direction of the lower end portion of the both side plate portions, and it is possible to reduce the construction work period and labor. There is an effect.

  The pile 7 is driven into the excavated ground 6, and the foundation concrete 8 joined to the pile 7 so as to project the head 7 a of the pile 7 is cast in-situ. A concrete footing unit 4 is placed. The thickness of the footing in this example is 50 to 70 cm. The footing part 4 is provided with a connecting hole 5 having an inner dimension larger than the outer dimension of the head part 7a of the pile 7, and the head part 7a of the pile 7 enters the pile connecting hole 5 (about 10 to 40 cm in this example). Between them, the concrete or mortar 10 is bonded in place.

  1 and 2 show Embodiment 1 of the present invention. The portal culvert building is constructed by connecting the portal culverts as segments in the length direction thereof. In this embodiment, the portal culvert building is an underground concrete structure of the river R constructed under the road. .

  The portal culvert 1 as the segment is a split type, and the upper plate portion 2 is made of, for example, precast concrete with a built-in PC steel, and is separated from the side plate portion 3 and the footing portion 4 (both portions 3, 4). Are made of precast concrete with embedded left and right bars, for example. The upper plate portion 2 is formed in a shape including a beam and a column that continues to the upper end of the side plate portion 3. The side plate portion 3 is formed in a column shape. The footing portion 4 is formed in a short plate shape extending horizontally from the lower end of the side plate portion 3 to the inside of the culvert, and a connecting hole 5 penetrating vertically is formed at a substantially central portion thereof. The connecting hole 5 is formed to have an inner dimension larger than the outer dimension of the head of the pile described later, and may be, for example, a square hole or a round hole as described above. And each part 2, 3, and 4 is designed and shape | molded by the intensity | strength which can endure the cross-sectional force which acts on them.

  While the pile 7 is driven into the excavated ground 6, the foundation concrete 8 joined to the pile 7 so that the head 7 a of the pile 7 protrudes is punched in the field. Reference numeral 9 denotes a foundation crushed stone laid under the foundation concrete 8.

  The footing 4 of the portal culvert 1 is placed on the foundation concrete 8, and the head 7 a of the pile 7 enters the connecting hole 5 penetrating the footing 4, and the connecting hole 5 and the head of the pile 7 are inserted. 7a is connected with concrete or mortar 10 in place.

  And the upper plate part 2 is constructed by the upper end part of the both-sides plate part 3, and it connects with 1 or 2 (not shown) selected from connection members, such as a steel plate, PC steel material, a steel rod, a bolt, for example. . Thus, one portal culvert 1 is installed. By repeating this, a large number of portal culverts 1 are arranged in a line and connected in the axial direction of the building by a plurality of steel materials (not shown) provided on the upper plate portion 2 and the side plate portion 3.

According to the portal culvert 1 of the first embodiment, the following operational effects can be obtained.
(A) Since the pile 7 and the foundation concrete 8 are joined and the head 7a of the pile 7 is inserted into the connection hole 5 provided in the footing part 4 and joined, the foundation part is solid, and both side plates The displacement of the lower end portion of the portion 3 in the culvert span direction can be limited.

(B) The upper slab part 2 is made of precast concrete, the side slab part 3 and the footing part 4 are also made of precast concrete, and what is hit on-site is to join the connecting hole 5 of the footing part 4 and the head 7 of the pile 7. Since only a small amount of concrete is required, the construction period and labor of construction can be reduced.

(C) By burying a reinforcing bar so as to surround the connecting hole 5 in the footing part 4, the bonding strength between the footing part 4 and the pile 7 can be increased.

  3 and 4 show a second embodiment of the present invention. The portal culvert 21 is different from the second embodiment only in that the footing portion 4 extends horizontally from the lower end of the side plate portion 3 to the culvert outer side, and the same reference numerals are used for members common to the first embodiment. The description is omitted. According to the second embodiment, the same effects as those of the first embodiment can be obtained.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

It is a perspective view of the portal culvert of Example 1 of the present invention. (A) is a front view of the same type culvert, and (b) is a IIb-IIb sectional view. It is a perspective view of the portal culvert of Example 2 of the present invention. (A) is a front view of the same type culvert, and (b) is a IVb-IVb sectional view. It is a front view of a prior art example. It is a front view of another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portal culvert 2 Upper plate part 3 Side plate part 4 Footing part 5 Connection hole 6 Excavation ground 7 Pile 7a Head 8 Foundation concrete 9 Foundation crushed stone 10 Concrete or mortar

Claims (2)

While the pile is driven into the excavated ground, the foundation concrete that joins the pile so that the head of the pile protrudes is driven in the field,
A portal-type culvert in which a foot-shaped culvert footing part made of precast concrete is placed on the foundation concrete, and a head of the pile is inserted into a connecting hole penetrating the footing part.   2. The gate type according to claim 1, wherein the connection hole is formed to have an inner dimension larger than an outer dimension of the head portion of the pile, and the connection hole and the head portion of the pile are connected to each other by concrete or mortar. Calvert.

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