JP7456686B1 - How to join concrete parts - Google Patents

Abstract

[Problem] To prevent a wing connected to a culvert from shifting or tilting. [Solution] A concrete member joining method in which a wing 2 made of precast concrete is joined to the side surface of a culvert 1, in which first joining reinforcing bars 15 protruding laterally from the side surface are attached to the culvert 1 at intervals in the vertical direction. A plurality of second joint reinforcing bars 25 protruding rearward from the rear surface are installed on the wing 2 at intervals in the vertical direction so as to match the position of the first joining reinforcing bars 15 installed on the culvert 1. , a process of arranging the wings 2 on the side of the culvert 1 and arranging the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2 so as to intersect, and the first joining reinforcing bars 15 of the culvert 1 and the wing 2 This is a method for joining concrete members, which includes the step of pouring concrete vertically at the intersection with the second joining reinforcing bars 25 to form a cast-in-place concrete part. [Selection diagram] Figure 7

Description

The present invention relates to a concrete member joining method for joining two concrete members.

Conventionally, when constructing waterways, underground passages, etc., it has been known to use a box-shaped concrete culvert with an opening in the center. In other words, by laying multiple culverts side by side and connecting them at the construction site, it is possible to construct waterways, underground passages, etc.

When constructing waterways or underground passages using culverts, plate-shaped wings that project laterally may be attached to the sides of the culverts placed at one or both ends when multiple culverts are laid side by side. . By attaching these wings to the sides of the culvert, it is possible to prevent the earth and sand around the culvert from collapsing.

Wings have traditionally been made of cast-in-place concrete, but in order to shorten the construction period, there has been a demand for wings to be made of precast concrete, which is manufactured in advance at a factory. Therefore, to attach the wings to the culvert, a precast concrete wing is used, and this precast concrete wing is joined to the side of the culvert. When joining a wing to the side surface of a culvert, for example, it is known to join the wing to the side surface of the culvert using fixing means such as bolts and nuts or fixing fittings (Patent Document 1).

However, when wings made of precast concrete are used to join the wings to the side surfaces of the culvert, the joining force is weak when the wings are joined to the side surfaces of the culvert using fixing means such as bolts, nuts, and fixing fittings. Therefore, there is a problem in that the joined wings cannot withstand earth pressure and the like, causing the wings to shift or tilt.

Japanese Patent Application Publication No. 2001-81795

The present invention has been made in view of such problems, and its purpose is to prevent one of the joined first and second concrete members from shifting or becoming displaced even if the joined first and second concrete members are subjected to earth pressure or the like. The purpose is to prevent the device from tipping over.

The present invention is a method for joining a concrete member, in which a second concrete member made of precast concrete is joined to a side surface of a first concrete member. Install multiple joint reinforcing bars at intervals in the vertical direction, and align the rod-shaped second joint reinforcing bars that protrude straight from the rear surface of the second concrete member to the position of the first joining reinforcing bars installed in the first concrete member. A plurality of fixing bars are installed at intervals in the vertical direction as shown in FIG. A step of arranging a second concrete member on the side surface of the first concrete member and arranging the first joint reinforcing bar of the first concrete member and the second joining reinforcing bar of the second concrete member so as to intersect with each other; This is a method for joining concrete members, which includes the step of pouring concrete in the vertical direction at the intersection of the joining reinforcing bars and the second joining reinforcing bars of the second concrete member to form a cast-in-place concrete part.

According to the present invention, when the second concrete member is arranged on the side surface of the first concrete member, the first joint reinforcing bar installed in the first concrete member and the second joint reinforcing bar installed in the second concrete member are arranged so as to intersect with each other. By placing concrete in this area and forming a cast-in-place concrete part, it is possible to firmly connect the first concrete member and the second concrete member. It is possible to prevent either the first concrete member or the second concrete member from shifting or tilting.

It is a perspective view when a waterway, an underground passage, etc. are constructed using a culvert. It is a front view when a wing is attached to a culvert. This is a plan view of the culvert with wings attached. FIG. 4A is an enlarged view of the side surface of the culvert viewed from above, and FIG. 4B is an enlarged view of the side surface of the culvert viewed from behind. FIG. 5A is an enlarged view from above of the end side of the wing that is attached to the culvert, and FIG. 5B is an enlarged view of the end side of the wing that is attached to the culvert, seen from the side. . FIG. 6A is a diagram showing a process of a method for joining a culvert and a wing, and FIG. 6A is an enlarged view from above of a state where the first joint reinforcing bars of the culvert and the second joining reinforcing bars of the wing are arranged to intersect, FIG. 6B is an enlarged rear view of FIG. 6A. FIG. 7A is a diagram illustrating the process of joining a culvert and a wing, and FIG. 7A is a top view of hoop reinforcing bars and through reinforcing bars installed at the intersection of the first joining reinforcing bars of the culvert and the second joining reinforcing bars of the wing. FIG. 7B is an enlarged view of FIG. 7A viewed from the rear. FIG. 6 is an enlarged top view showing another shape of the hoop reinforcing bar; FIG. 9A is a diagram illustrating the process of joining a culvert and a wing, and FIG. 9A is an enlarged view from above of a concrete formwork assembled at the intersection of the first joint reinforcing bar of the culvert and the second joining reinforcing bar of the wing. FIG. 9B is an enlarged view of FIG. 9A viewed from the rear. FIG. 10A is a diagram showing the process of a method for joining a culvert and a wing, and FIG. 10A is a top view of a cast-in-place concrete section formed at the intersection of the first joint reinforcing bar of the culvert and the second joining reinforcing bar of the wing. FIG. 10B is an enlarged view of FIG. 10A viewed from the rear. It is a top view when a wing is inclined and joined to the side of a culvert. FIG. 12A is an enlarged view from above when the first joint reinforcing bars and second joining reinforcing bars are installed in two rows on the culvert and the wing, and FIG. 12B is an enlarged view from behind of FIG. 12A. . Fig. 13A is an enlarged view from above when spiral reinforcing bars are installed at the intersection of the first joint reinforcing bars of the culvert and the second joining reinforcing bars of the wing, and Fig. 13B is a view from the rear of Fig. 13A. This is an enlarged view.

An embodiment of the method for joining concrete members of the present invention will be described with reference to the drawings.
The method of joining concrete members according to this embodiment is a method of joining a second concrete member made of precast concrete to a side surface of a first concrete member made of cast-in-place concrete or precast concrete. Here, a method is used in which a wing (second concrete member) is joined to the side surface of a culvert (first concrete member) when constructing a waterway or an underground passage. However, the method of joining concrete members is not limited to joining a culvert and a wing, and may be a method of joining other concrete members.

FIG. 1 is a perspective view of a waterway, an underground passage, etc. constructed using the culvert 1.
When constructing a waterway or an underground passage using culverts 1, as shown in the figure, a plurality of culverts 1 are laid in a line to construct a waterway or an underground passage, and these are connected. This culvert 1 has a box-like shape with an opening extending from the front to the back in the center, and is made of precast concrete that is manufactured in advance at a factory or the like. Note that the culvert 1 is not limited to being made of precast concrete, but may be made of cast-in-place concrete that is formed by pouring concrete using a formwork at a construction site.

Next, the culvert 1 is extended laterally to the side of the culvert 1 placed at one end or both ends when a plurality of culverts 1 are laid side by side in the longitudinal direction (the culvert 1 located at the end when a plurality of culverts 1 are laid side by side). Attach plate-shaped wing 2. The wing 2 is made of precast concrete that is manufactured in advance at a factory or the like. Wing 2 is intended to prevent earth and sand from collapsing around the culvert. Furthermore, a raised portion 3 made of precast concrete or cast-in-place concrete is formed on the culvert 1 to which the wing 2 is attached. This raised portion 3 is also provided to prevent earth and sand from collapsing from the upper part of the culvert.

Next, the culvert 1 and the wing 2 will be explained.
FIG. 2 is a front view of the wing 2 attached to the culvert 1. FIG. 3 is a plan view of the wing 2 attached to the culvert 1. 4A is an enlarged view of the side surface of the culvert 1 viewed from above, and FIG. 4B is an enlarged view of the side surface of the culvert 1 viewed from behind. FIG. 5A is an enlarged view of the end of the wing 2 on the side attached to the culvert 1 viewed from above, and FIG. 5B is a side view of the end of the wing 2 on the side attached to the culvert 1. This is an enlarged view.
Note that although the terms "lateral" and "rear" are used in the description of this specification, "lateral" refers to the area indicated by arrow A in FIGS. 1, 2, 3, 4, and 5. The term "rear" refers to the rear in the front-rear direction indicated by arrow B in FIGS. 1, 3, 4, and 5. Furthermore, "front side" and "rear side" also refer to the front side and the rear side in the front-back direction. Note that arrows A, B, etc. in other drawings have the same meaning.

As shown in Figures 2 and 3, the culverts 1, which are laid in multiple rows in the longitudinal direction, are divided into upper and lower halves, an upper culvert 11 and a lower culvert 12, and are box-shaped in the center by combining the upper culvert 11 and the lower culvert 12. Shape it so that it opens across the front and back. Note that the culvert 1 is not limited to being divided into two parts vertically, but may be further divided into a plurality of parts, or may be made of one member without being divided.

When a plurality of culverts 1 are laid side by side in the front-rear direction, the culverts 1 are placed at one end or both ends, and as shown in FIGS. A plurality of one-joint reinforcing bars 15 are installed at intervals in the vertical direction. A plurality of first joint reinforcing bars 15 are installed on the side surface 13 of the culvert 1 over the entire length in the vertical direction. Furthermore, a fixing metal fitting 16 is provided at the tip of the first joining reinforcing bar 15 in order to ensure the fixing strength of the reinforcing bar.

Further, the wing 2 attached to the side surface of the culvert 1 is divided into upper and lower halves, an upper wing 21 and a lower wing 22, as shown in FIGS. 2 and 3, and the upper wing 21 and the lower wing 22 are combined. Note that the wing 2 is not limited to being divided into two parts, the upper wing 21 and the lower wing 22, but may be further divided into a plurality of parts, or it may be made of one member without being divided. It can be anything.

In the wing 2, as shown in FIGS. 5A and 5B, a plurality of second joint reinforcing bars 25 that project horizontally toward the rear are installed at intervals in the vertical direction on the rear surface 23 of the end side that is attached to the culvert 1. do. A plurality of second joint reinforcing bars 25 are installed on the rear surface 23 of the wing 2 over the entire length in the vertical direction, and are installed so as to match the positions of the plurality of first joining reinforcing bars 15 installed on the side surface 13 of the culvert 1. A fixing metal fitting 26 is also provided at the tip of the second joining reinforcing bar 25 in order to ensure the fixing strength of the reinforcing bar. In addition, in the wing 2, on the side surface 24 on the side to be attached to the culvert 1, a chamfered portion 27 is formed by cutting out the rear side, as shown in FIG. I try to stay in touch with

Next, a method for joining a culvert and a wing, which is a method for joining concrete members, will be explained.
FIG. 6A is an enlarged view from above of the state in which the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2 are arranged so as to intersect, and FIG. 6B is an enlarged view seen from the rear of FIG. 6A. This is an enlarged view. FIG. 7A is an enlarged top view of the hoop reinforcing bars 43 and through reinforcing bars 44 installed at the intersection of the first joining reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2, and FIG. 7B 7A is an enlarged view from the rear of FIG. 7A. FIG. 8 is a top view showing another shape of the hoop reinforcing bar. FIG. 9A is an enlarged view of the concrete formwork 45 assembled at the intersection of the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2, viewed from above. It is an enlarged view of 9A seen from the rear. FIG. 10A is an enlarged top view of the cast-in-place concrete section 40 formed at the intersection of the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2, and FIG. 10B is It is an enlarged view seen from the rear of FIG. 10A.

The method for joining the culvert 1 and the wings 2 includes a first step of arranging the wings 2 on the side surface 13 of the culvert 1 and arranging the first joining reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wings 2 so as to intersect with each other. and a second step of pouring concrete in the vertical direction at the intersection of the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2 to form a cast-in-place concrete section 40 (FIG. 10A). and has.

(First step)
In the first step, the wings 2 are arranged on the side surfaces 13 of the culvert 1 that has been laid, here, on both sides 13 in the left and right direction. At this time, as shown in FIGS. 6A and 6B, when the wings 2 are arranged on the side surface 13 of the culvert 1, the plurality of first joint reinforcing bars 15 installed on the side surface 13 of the culvert 1 and the rear surface 23 of the wing 2 The plurality of second joint reinforcing bars 25 are arranged so as to intersect with each other. The first joint reinforcing bars 15 and the second joining reinforcing bars 25 intersect at right angles.

Furthermore, when the wings 2 are arranged on the side surface 13 of the culvert 1, a plate-shaped packing 41 that is elongated in the vertical direction is arranged between the side surface 13 of the culvert 1 and the side surface 24 of the wing 2. As a result, the side surface 13 of the culvert 1 and the side surface 24 of the wing 2 come into contact with each other with the packing 41 interposed therebetween. Furthermore, a caulking material 42 is filled between the side surface 13 of the culvert 1 and the side surface 24 of the wing 2 in front of the packing 41.

Next, as shown in FIGS. 7A and 7B, annular hoop reinforcing bars 43 are placed at intervals in the vertical direction at the intersection of the first joining reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2. Install multiple. The hoop reinforcing bar 43 has a circular annular shape and is arranged horizontally. Subsequently, a plurality of vertically extending through reinforcing bars 44 are installed that come into contact with the hoop reinforcing bars 43 that are installed in the vertical direction. This through reinforcing bar 44 connects a plurality of hoop reinforcing bars 43 installed in the vertical direction. Although the hoop reinforcing bar 43 has a circular annular shape, it is not limited to this, and as shown in FIG. 8, it may have a square annular shape, or even a rectangular annular shape. But that's fine. In addition, regarding the plurality of hoop reinforcing bars 43 and through reinforcing bars 44, if the cast-in-place concrete part 40 formed in the second process described later has sufficient strength, it is not necessary to install the hoop reinforcing bars 43 and through reinforcing bars 44. good.

(Second process)
The second step is a step performed after the first step, and covers the intersection of the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2, as shown in FIGS. 9A and 9B. Assemble the concrete formwork 45 as follows. Subsequently, concrete is placed inside the concrete formwork 45. After the poured concrete has hardened, the concrete formwork 45 is removed. As a result, as shown in FIGS. 10A and 10B, a cast-in-place concrete portion 40 can be formed in the vertical direction at the intersection of the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2. can. In this way, the wing 2 is joined to the side surface 13 of the culvert 1.

As explained above, when the wings 2 are arranged on the side of the culvert 1, the plurality of first joint reinforcing bars 15 installed on the culvert 1 and the plurality of second joint reinforcing bars 25 installed on the wing 2 are arranged so as to intersect with each other. By placing concrete at the intersection of the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2 to form a cast-in-place concrete part 40, the culvert 1 and the wing 2 are can be firmly joined. Thereby, even if the wing 2 is affected by earth pressure or the like, the wing 2 can be prevented from shifting or leaning relative to the culvert 1.

Furthermore, inside the cast-in-place concrete section 40, a plurality of intersecting first joint reinforcing bars 15 of the culvert 1 and second joining reinforcing bars 25 of the wing 2 are installed in the vertical direction, and a plurality of hoop reinforcing bars 43 are installed in the vertical direction. By installing through reinforcing bars 44 that connect a plurality of hoop reinforcing bars 43 and arranging them so as to cross each other, the cast-in-place concrete part 40 itself can be made solid, and this makes it possible to strengthen the culvert 1 and the wing. 2 can be joined even more firmly.

Furthermore, since the plurality of first joint reinforcing bars 15 installed in the culvert 1 and the plurality of second joint reinforcing bars 25 installed in the wing 2 are in the shape of a single bar that protrudes horizontally toward the side or rear, this The work of installing the first joining reinforcing bars 15 and the second joining reinforcing bars 25 in the culvert 1 or the wing 2, and the work of arranging the first joining reinforcing bars 15 and the second joining reinforcing bars 25 so as to intersect, are extremely easy and efficient. It is possible to improve the workability.

Furthermore, when joining the wing 2 to the side surface of the culvert 1, the angle at which the first joining reinforcing bar 15 of the culvert 1 and the second joining reinforcing bar 25 of the wing 2 intersect can be changed arbitrarily. For example, as shown in FIG. 11, by arranging the first joint reinforcing bars 15 of the culvert 1 and the second joining reinforcing bars 25 of the wing 2 so as to diagonally cross each other, the wing 2 is tilted and joined to the side of the culvert 1. can do. That is, the angle between the culvert 1 and the wing 2 can be changed depending on each construction site, and the wing 2 can be joined to the side surface of the culvert 1 at an optimal angle. Therefore, in wing 2, there is no need to change the shape of wing 2 depending on the angle at which it joins to culvert 1, and as a result, the wing can be made into a ready-made product, and the manufacturing cost of wing 2 can be reduced. .

In the above embodiment, the multiple first connecting bars 15 installed on the side 13 of the culvert 1 and the multiple second connecting bars 25 installed on the rear surface 23 of the wing 2 are installed in a single row from top to bottom, but this is not limited to this. For example, as shown in Figures 12A and 12B, the first connecting bars 15 may be installed in multiple rows, such as two rows, from top to bottom on the side 13 of the culvert 1, and the second connecting bars 25 may be installed in multiple rows, such as two rows, from top to bottom on the rear surface 23 of the wing 2. By arranging the first connecting bars 15 of the culvert 1 and the second connecting bars 25 of the wing 2 in multiple rows, such as two rows, in this way, the culvert 1 and the wing 2 can be joined even more firmly.

Moreover, in the inside of the cast-in-place concrete part 40, that is, in the part where the first joint reinforcement 15 of the culvert 1 and the second joint reinforcement 25 of the wing 2 intersect, a plurality of hoop reinforcements 43 and a plurality of hoop reinforcements are arranged in the vertical direction. Although a through reinforcing bar 44 is installed to connect the reinforcing bars 43, the present invention is not limited to this. For example, as shown in FIG. 13, one spiral reinforcing bar 46 spiraling in the vertical direction may be installed. It's okay. Note that the number of spiral reinforcing bars 46 is not limited to one, and may be two or more.

1...Culvert, 2...Wing, 3...Elevated part, 11...Upper culvert, 12...Lower culvert, 13...Side surface, 15...First joint reinforcing bar, 16...Fixing hardware, 21...Upper wing, 22...Lower wing, 23 ...rear surface, 24...side surface, 25...second joint reinforcing bar, 26...fixing hardware, 27...chamfer, 40...cast-in-place concrete part, 41...packing, 42...caulking material, 43...hoop reinforcing bar, 44...through reinforcing bar, 45...Concrete formwork, 46...Spiral reinforcing bar.

Claims (3)

A concrete member joining method of joining a second concrete member made of precast concrete to a side surface of a first concrete member, the method comprising:
A plurality of rod-shaped first joint reinforcing bars that protrude straight laterally from the side surface are installed at intervals in the vertical direction on the first concrete member, and a second rod-shaped joint reinforcing bar that projects straight rearward from the rear surface is installed on the second concrete member. A plurality of reinforcing bars are installed at intervals in the vertical direction to match the position of the first joining reinforcing bars installed on the first concrete member, and the ends of the first joining reinforcing bars installed on the first concrete member and the second concrete member At the same time, fixing metal fittings are installed at the tips of the second joint reinforcing bars to be installed at the
arranging the second concrete member on the side surface of the first concrete member and arranging the first joint reinforcing bar of the first concrete member and the second joining reinforcing bar of the second concrete member so as to intersect;
pouring concrete in the vertical direction at the intersection of the first joint reinforcing bars of the first concrete member and the second joint reinforcing bars of the second concrete member to form a cast-in-place concrete part;
A method for joining concrete members, characterized by having the following. In the method for joining concrete members according to claim 1,
At the intersection of the first joint reinforcement of the first concrete member and the second joint reinforcement of the second concrete member, a plurality of annular hoop reinforcements are installed at intervals in the vertical direction, and through reinforcement bars are installed in the vertical direction. , A method for joining concrete members that attaches to multiple hoop reinforcing bars and connects multiple hoop reinforcing bars installed in the vertical direction. In the method for joining concrete members according to claim 1,
A method for joining concrete members in which a spiral reinforcing bar spiraling in the vertical direction is installed at the intersection of a first joining reinforcing bar of a first concrete member and a second joining reinforcing bar of a second concrete member.

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