JP3574512B2 - Flexible box culvert molding method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flexible box culvert forming method for forming a flexible box culvert formed so as to be able to cope with displacement due to uneven settlement of the ground or the like.
[0002]
[Prior art]
The box culvert is installed continuously in the ground, and water flows through the box culvert. Therefore, it is necessary that the joint portion is configured to be able to follow displacement due to uneven settlement of the ground.
[0003]
In response to this demand, the present applicant has developed a flexible box culvert as shown in FIGS. 7A and 7B (Japanese Patent Laid-Open No. 63-110327).
[0004]
In the figure, reference numerals 1a and 1b denote box culvert bodies which are formed of reinforced concrete into a rectangular cross section and are installed adjacent to each other in the axial direction. Between the end surfaces of the box culverts 1a and 1b, which are continuous between the two end surfaces and are embedded in both end surfaces. The flexible connecting member 3 for absorbing the displacement of the box culvert bodies 1a and 1b is located on both sides of the flexible connecting member 2 between the end faces of the box culvert bodies 1a and 1b, and the box culvert body 1a and The joint member is continuously interposed around the periphery of the box culvert 1b and blocks the space between the adjacent box culvert bodies 1a and 1b.
[0005]
Further, the applicant has subsequently developed and filed an application for a flexible box culvert molding method for molding the flexible box culvert (Japanese Patent Application Laid-Open No. Hei 2-164949). In this method, a formwork of one of the adjacent box culvert bodies 1a or 1b (hereinafter referred to as "box culvert body 1a") is assembled, a reinforcing bar (not shown) is arranged in the formwork, and The flexible connecting member 2 is temporarily attached to the upper end. Then, the box culvert main body 1a is formed by casting concrete into the mold.
[0006]
Next, joint members 3 are attached on both sides of the flexible connecting member 2 on the box culvert main body 1a, a formwork of the box culvert main body 1b is assembled, and reinforcing bars are arranged therein. Then, concrete is poured into the form and cured.
[0007]
The box culvert bodies 1a and 1b are formed by the above-described forming method, and at the same time, the flexible connecting member 2 is attached between the end faces of the box culvert bodies 1a and 1b. The flexible connecting member 2 is embedded and fixed in the concrete at the end faces of the box culvert bodies 1a and 1b.
[0008]
[Problems to be solved by the invention]
The conventional flexible box culvert is molded by the molding method as described above, but has a problem that it is difficult to firmly attach the flexible connecting member 2 to the end faces of the box culvert main bodies 1a and 1b due to the manufacturing method. .
[0009]
The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a flexible box culvert molding method capable of securely fixing a flexible connecting member to an end face of a box culvert main body. I do.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a method for forming a flexible box culvert in which a mold is assembled to mold one of the box culvert bodies adjacent in the axial direction, and a flexible is provided at a lower end of the mold. Temporarily attaching a connecting member, and casting concrete in the form to form one of the box culvert bodies, and simultaneously embed and fix one end of the flexible connecting member in concrete, After demolding, the box culvert body is placed on the box culvert body support base with the flexible connecting member facing upward, and the flexible connecting member is protruded from the end surface of the box culvert body and built. Assembling a formwork for molding the other of the flexible box culvert body on the box culvert body, and placing concrete in the formwork. Set to the other end of the other of the simultaneously formed the flexible connecting member of the flexible box culvert body, characterized in that fixing is embedded in the concrete.
[0011]
In the flexible box culvert molding method according to the second aspect of the present invention, after forming one of the adjacent box culvert main bodies in the preceding paragraph, the box culvert main body and the mold of the box culvert main body are turned over. And the flexible connecting member is made to protrude from an end face of the box culvert main body, and then the other of the flexible box culvert main body is formed on the box culvert main body. And forming the other part of the flexible box culvert main body at the same time as embedding concrete in the formwork and simultaneously embedding and fixing the other end of the flexible connecting member in the concrete. It is characterized by doing.
[0012]
Embodiment
Embodiment 1
FIGS. 1 to 4A and 4B show a flexible box culvert molding form (hereinafter, referred to as a "box culvert molding form") used in carrying out the flexible box culvert molding method according to the present invention. In the drawing, the same parts as those in the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.
[0013]
Reference numeral 4 denotes a bottom formwork that forms the bottom of the box culvert molding formwork, 5 denotes a formwork body that forms the body, 6 denotes a formwork that is installed on the formwork body 5 and casts concrete into the formwork body 5. And a reference numeral 7 denotes a box culvert main body support base for temporarily placing the formed box culvert main body 1a (or 1b).
[0014]
The bottom form 4 is formed in a rectangular ring shape, and a groove 4a for temporarily attaching the flexible connecting member 2 to the center thereof is continuous around the bottom form 4 and has a predetermined depth. (See FIGS. 2A and 2B). Further, the bottom form 4 is bolted or clipped so as to be easily assembled and disassembled.
[0015]
The formwork body 5 is provided with an outer formwork 5a and an inner formwork 5b which are provided upright on the outside and inside of the box culvert bodies 1a and 1b to be formed, respectively, and is formed in a tubular shape having a rectangular cross section (FIG. 1). The outer and inner mold frames 5a and 5b are bolted or clipped so as to be easily assembled and disassembled.
[0016]
Reference numeral 5c is a spacer attached to the inside of the lower end of the outer mold frame 5a to secure a space for attaching the steel collar 5d (see FIG. 6B).
[0017]
The steel collar 5d is formed in a ring shape having a rectangular shape, and is attached across both ends between the end portions of the box culvert bodies 1a and 1b, so that the shear displacement exceeds an allowable amount of the box culvert bodies 1a and 1b. This prevents the flexible connecting member 2 from being cut.
[0018]
The concrete casting hopper 6 is formed in a rectangular cross-sectional shape, and around the periphery of the formwork body 5, there is provided a concrete inlet 6 a around which the concrete is put between the outer formwork 5 a and the inner formwork 5 b of the formwork body 5. It is formed continuously. The bottom 6b has a slope inclined from the center toward the concrete inlet 6a, so that only the concrete is poured into the center of the concrete casting hopper 6 so that the entire concrete of the formwork body 5 is evenly distributed. Can be cast.
[0019]
The box culvert main body support pedestal 7 has a groove 7a for vertically embedding the formed box culvert main body 1a (or 1b) (see FIGS. 4 (a) and 4 (b)). A guide member 7b for positioning the box culvert main body 1a (or 1b) built in the groove portion 7a protrudes from the bottom.
[0020]
In such a configuration, a flexible box culvert molding method according to the present invention will now be described in order.
[0021]
(1) First, the bottom mold 4 is set, and the flexible connecting member 2 is temporarily attached to the groove 4a of the bottom mold 4 (see FIG. 5A).
[0022]
The flexible connecting member 2 is fixed by inserting one end 2a thereof into the groove 4a and filling the both sides thereof with a filler (not shown) such as a foaming material. And stick it out vertically. In addition, joint members 3 are mounted on the bottom form 4 on both sides of the flexible connecting member 2. Further, a reinforcing bar (not shown) of the box culvert main body 1a is arranged on the bottom formwork 4.
[0023]
(2) Next, the outer mold frame 5a and the inner mold frame 5b of the mold body 5 are erected so that the reinforcing bar of the box culvert body 1a is sandwiched between the outside and the inside of the bottom mold frame 4 (FIG. b) Refer to) and fix it with bolts or clips so that it does not fall down.
[0024]
(3) Next, the concrete casting hopper 6 is set on the formwork body 5, and between the outer formwork 5 a and the inner formwork 5 b of the formwork body 5 via the concrete hopper 6. Cast concrete evenly (see Fig. 5 (c)). Then, it is cured until the concrete develops sufficient strength.
[0025]
In the steps so far, the box culvert main body 1a is formed, and one end 2b of the flexible connecting member 2 is fixed to the end face of the box culvert main body 1a.
[0026]
(4) Next, when the concrete of the box culvert main body 1a develops sufficient strength, the outer mold 5a and the inner mold 5b of the mold body 5 are disassembled and removed.
[0027]
(5) Next, the box culvert main body 1a is repeatedly turned upside down, and the box culvert main body 1a is built into the groove-shaped portion 7a of the box culvert main body support pedestal 7. The temporary connection is performed with the flexible connecting member 2 facing upward (see FIG. 6A).
In this case, since the guide member 7b that determines the position of the box culvert main body 1a protrudes from the bottom of the groove-shaped portion 7a, the box culvert main body 1a can be temporarily placed at an accurate position, and the quality can be improved.
[0028]
(6) Next, a reinforcing bar (not shown) of the box culvert 1b is arranged on the formed box culvert main body 1a.
[0029]
(7) Next, a steel collar 5d is installed at the upper end of the box culvert body 1a, and the outer and inner forms 5a and 5b of the form body 5 are erected and bolted so as not to fall down. Fix it by stopping or clipping it (see FIG. 6B).
[0030]
(8) Next, the concrete casting hopper 6 is set on the formwork body 5 and concrete is uniformly cast into the formwork body 5 via the concrete casting hopper 6 (FIG. 6). (B)). Then, it is cured until the concrete develops sufficient strength.
[0031]
In the steps so far, the box culvert main body 1b is formed, and the other end 2a of the flexible connecting member 2 is fixed to the end face of the box culvert main body 1b. Therefore, the concrete placing hopper 6 is removed, By disassembling the mold body 5, the box culvert bodies 1a and 1b are connected to form a flexible box culvert.
[0032]
When carrying out and carrying the flexible box culvert formed in this way, the box culvert main bodies 1a and 1b are bridged between the box culvert main bodies 1a and 1b (the box culvert main bodies 1a and 1b). The left and right portions and the upper end portion) are connected to each other by a plurality of connecting members (not shown) which are bolted to each other. The connecting member carries the flexible box culvert to the site and removes it after installation in a predetermined position.
[0033]
Embodiment 2
In the first embodiment, after the box culvert main body 1a is formed, the mold body 5 is disassembled, the box culvert main body 1a is turned over, and the box culvert main body support base 7 is turned upside down with the flexible connecting member 2 up. After the box culvert main body 1b is molded after being temporarily placed on the box body, after the box culvert main body 1a is formed, the form culvert main body 5 is not disassembled, and the box culvert main body 1a is attached with the form main body 5 attached. The box culvert body 1b may be formed by assembling a mold body for forming the box culvert body 1b.
[0034]
According to this embodiment, since the form body 5 can be used as the box culvert body support base 7, there is an effect that the box culvert body support base 7 becomes unnecessary.
[0035]
【The invention's effect】
The flexible box culvert molding method according to claims 1 and 2 according to the present invention has the above-described configuration, and in particular, the flexible connecting member has a lower end portion of a mold for molding the box culvert main body. By attaching the flexible connecting member to the end face of the box culvert main body, the flexible connecting member can be buried and fixed in concrete of stable quality without separation of cement and aggregate. This has the effect that it can be firmly and firmly fixed. In addition, since the box culvert main body support base is used to temporarily place the box culvert main body, quality control is good and product accuracy can be improved.
[0036]
In the method for forming a flexible box culvert according to claim 1 of the present invention, one of the box culvert main bodies is formed, and after demolding, the box culvert main body is temporarily placed on a box culvert main body support base. Since the other part of the box culvert main body is molded, the formwork for molding the box culvert main body may be a single set. Therefore, the assembling and removing of the mold form can be efficiently performed, and the workability is extremely good. Very economical.
[0037]
In the method for forming a flexible box culvert according to claim 2 of the present invention, a mold body for molding the box culvert body is used as a support base for supporting the box culvert body. With two sets, there is an effect that a support base for supporting the box culvert main body is not required.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a flexible box culvert molding form.
FIG. 2A is a longitudinal sectional view of a bottom mold, and FIG. 2B is a partial plan view thereof.
3A is a longitudinal sectional view of a concrete casting hopper, and FIG. 3B is a partial plan view thereof.
4A is a longitudinal sectional view of a support base of the box culvert main body, and FIG. 4B is a partial plan view thereof.
5 (a), 5 (b) and 5 (c) are process diagrams showing a method for forming a flexible box culvert.
FIGS. 6A and 6B are process diagrams showing a method for forming a flexible box culvert.
7A and 7B are a longitudinal sectional view and a transverse sectional view of a joint portion of a flexible box culvert.
[Explanation of symbols]
1a, 1b ... box culvert body, 2 ... flexible connecting member, 3 ... joint member,
4: bottom formwork, 5: formwork body, 6: hopper for concrete casting
7: Box culvert body support base, 4a: Groove, 5a: Outer frame, 5b: Inner frame,
5c: spacer, 5d: steel collar, 6a: concrete inlet, 7a: grooved portion,
7b: Guide member.

Claims (2)

Assembling a form to form one of the adjacent box culvert bodies, temporarily attaching a flexible connecting member for connecting the box culvert bodies to the lower end of the form, and concrete in the form. And forming one of the box culvert bodies at the same time, one end of the flexible connecting member is buried and fixed in concrete, and then, after demolding, the box culvert body is mounted on the box culvert body support base. The flexible connecting member is erected on the upper side, and then a mold is assembled on the box culvert main body to form the other of the flexible box culvert main body, and concrete is embedded in the mold. To form the other side of the flexible box culvert main body and simultaneously connect the other end of the flexible connecting member to the concrete. Flexible box culverts molding method characterized by fixing embedded to. Assembling a form to form one of the adjacent box culvert bodies, temporarily attaching a flexible connecting member for connecting the box culvert bodies to the lower end of the form, and concrete in the form. At the same time as forming one of the box culvert bodies, simultaneously embedding and fixing one end of the flexible connecting member in concrete, and then turning over the box culvert body and the formwork to fix the flexible member. With the connecting member up, a formwork is assembled on the box culvert body to form the other of the flexible box culvert body, and concrete is poured into the formwork to form the flexible form. The other end of the flexible box culvert body is molded and simultaneously the other end of the flexible connecting member is embedded in concrete and fixed. That flexible box culvert molding method.

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