JP2002047738A - Construction method and structure for expansion joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for an expansion joint, allowing a frictional sound to be abated in an expansion joint part. SOLUTION: Styrofoam (R) 30 is disposed in a position (the expansion joint part (EJ pat) 3) adjacent to a first concrete structure 1. A plurality of projecting parts 30a are installed in the side surface abutting on the concrete structure 1 of the Styrofoam (R) 30. The side surface having the projecting parts 30a is disposed in such a manner as to abut on the concrete structure 1 for the purpose of enabling a reduction in the contact area of precast concrete 10 and the Styrofoam (R) 30 and suppression of the frictional sound. In addition, a post-cast separator 21 is detached after post-cast concrete 20 is placed to be able to eliminate the sound caused by friction with the Styrofoam (R) 30 in the EJ part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion joint method and an expansion joint structure in which a foamed resin plate is arranged adjacent to a first concrete structure to construct a second concrete structure.

[0002]

2. Description of the Related Art Conventionally, as one method of connecting structures, an expansion joint (hereinafter referred to as an EJ) is formed at a position adjacent to a first structure.
There is known a method of constructing a second structure via a part J. This construction method is based on the idea that the structures are physically separated so that the structures do not adversely affect each other mechanically. The EJ section absorbs expansion, contraction, and the like of the structure due to a temperature change to prevent cracking of the structure, or when connecting structures having different vibration cycles, vibrations due to an earthquake or the like. And acts to control the stress and deformation properties generated in the structure.

As disclosed in the prior art of Japanese Patent Application Laid-Open No. Hei 7-286374, when a conventional EJ portion is formed, a first concrete structure (preceding concrete) formed in advance by casting is used. At the position facing the joint end face,
A damping plate (form) is disposed on the opposite side of the first concrete structure with a buffering material such as styrene foam interposed therebetween, and a post-cast concrete is poured into the damping plate. To form a second concrete structure. Then, after the post-cast concrete is cured and hardened, the barrier plate is disassembled to obtain a structure having a target EJ portion.

[0004]

However, in a state where the cushioning material is present in the EJ portion, due to the temperature difference of the EJ portion and the like, the contact surface between the pre-cast concrete and the cushioning material in a dry state is not good. There is a problem in that friction is generated and a friction noise, which can be called abnormal noise, is generated. Also, when casting concrete, for example, a separator is provided to maintain a space between the formwork and the cushioning material. Even in a contact portion between the separator and the cushioning material, a temperature difference or the like in the EJ portion is required. Frictional noise is generated due to this.

Accordingly, the present invention provides an expansion joint method capable of reducing the friction noise in the EJ section.

[0006]

According to the first aspect of the present invention,
A pre-casting step (A) for constructing a first concrete structure (1), and after the pre-casting step, a foamed resin plate (styrofoam 3) is disposed adjacent to the first concrete structure.
0) and the second concrete structure (2) so that the foamed resin plate is sandwiched between the first concrete structure and the resin placement step (B) after the resin placement step. An expansion joint method including a post-casting step (C) for constructing, wherein a plurality of protrusions (30a) are provided on a side surface of the foamed resin plate that comes into contact with a first concrete structure. Features.

According to the first aspect of the present invention, a plurality of convex portions are provided on the side surface of the foamed resin plate, and the side surface having the convex portion comes in contact with the first concrete structure. The contact area between the plate and the first concrete structure can be reduced. As described above, in a state where the foamed resin plate is in contact with the first concrete structure, frictional noise is generated at these contact surfaces due to a temperature difference in the EJ section (3) and abnormal noise is generated. Cause. Therefore, by reducing the contact area of these contact surfaces, it is possible to suppress the friction noise that causes abnormal noise.

According to a second aspect of the present invention, there is provided a pre-casting step for constructing a first concrete structure, and after the pre-casting step, a resin foam plate is disposed adjacent to the first concrete structure. After the arranging step and the resin arranging step,
A post-casting step of constructing a second concrete structure, such that the foamed resin plate is sandwiched between the first concrete structure, and the post-casting step, A formwork (dam plate 22) is arranged at an interval for providing a second concrete structure adjacent to the foamed resin plate, and a separator (post-cut separator 21) is used to maintain the interval, After placing concrete between the foamed resin plate and the mold, the separator is removed.

According to the second aspect of the present invention, the separator is removed after casting concrete for constructing a second concrete structure, thereby avoiding contact between the separator and the foamed resin plate. it can. Therefore, the friction noise generated between the separator and the foamed resin plate can be eliminated, and abnormal noise caused by a temperature difference or the like in the EJ portion can be reduced.

The foamed resin plate is made of a material such as polystyrene foam or polystyrene foam, and functions sufficiently as a mold even when concrete is cast.

According to a third aspect of the present invention, in the expansion joint method according to the second aspect, a hollow pipe (23) is disposed in a portion where a second concrete structure is to be constructed, and the separator is provided in the hollow pipe. In the inserted state, concrete is poured into a portion where the second concrete structure is to be constructed.

According to the third aspect of the present invention, since the hollow pipe is disposed and the separator is inserted into the hollow pipe, the separator is easily removed after the post-cast concrete (20) is cast. be able to. That is, if concrete is poured in a state where the separator is inserted into the hollow pipe, the concrete does not come into contact with the separator, so that it can be easily removed even after the concrete is hardened. Accordingly, the effect of the invention described in claim 2 can be promoted.

The invention according to claim 4 is the invention according to claim 2 or 3.
In the expansion joint method according to the above description, in the pre-punching step, a pre-punching separator (pre-punching separator 11) for maintaining a space between molds is used, and the pre-punching separator has The first-placed separator is disposed so as to protrude from the first concrete structure toward the foamed resin plate so as to connect a separator (post-separated separator 21), and the first-placed separator is attached to the foamed resin plate. A notch (30b) is provided so that the protruding portion of the notch does not contact.

According to the fourth aspect of the present invention, since the notched portion is provided so that the precast concrete separator does not come into contact with the foamed resin plate, the notch between the precast concrete separator and the foamed resin plate can be prevented. No fricative noise occurs between them. That is, pre-cast concrete (10)
The precast concrete separator that maintains the mutual spacing of the opposing forms during casting is in a state of being buried in the concrete after the precast concrete is cast, and the tip end of the precast concrete separator is It protrudes so as to come into contact with the foamed resin plate arranged adjacent to the pour concrete portion. Therefore, when arranging the foamed resin plate, if a cutout portion is provided in the foamed resin plate so that the front end does not come into contact with the foamed resin plate, a friction sound may be generated between the precast concrete separator and the foamed resin plate. Absent.

According to a fifth aspect of the present invention, there is provided a first concrete structure, and a second concrete structure which is constructed close to the first concrete structure after constructing the first concrete structure. An expansion joint structure comprising a foamed resin plate sandwiched between the first concrete structure and the second concrete structure, wherein the foamed resin plate has the first structure. A plurality of protrusions are formed on a side surface that comes into contact with the concrete structure.

According to the fifth aspect of the invention, the same effects as those of the first aspect can be obtained. When constructing the expansion joint structure of the present invention, after placing and curing concrete of the first concrete structure, the foamed resin plate is arranged, and then the foamed resin plate is used as a part of the mold to form the second joint. Cast concrete to be a concrete structure. In this case, in the constructed expansion joint structure, between the foamed resin plate and the second concrete structure that are in contact before the concrete is hardened, the foamed resin plate and the first contacted after the concrete is hardened. Friction noise is more likely to be generated between the concrete structure and the first concrete structure. Therefore, the frictional sound can be efficiently suppressed by reducing the contact area between the foamed resin plate and the first concrete structure by the protrusions. Can be.

According to a sixth aspect of the present invention, there is provided a first concrete structure, and a second concrete structure which is constructed close to the first concrete structure after constructing the first concrete structure. An expansion joint structure comprising a foamed resin plate disposed between the first concrete structure and the second concrete structure, and constructing the first concrete structure. One end of a first separator (pre-separated separator 11) that keeps the space between the formwork is provided so as to protrude toward the foamed resin plate side, and when the second concrete structure is constructed, the space between the formwork is set. And a second cell, one end of which is connected to one end of the first separator, and which is arranged to penetrate the foamed resin plate and the second concrete structure. Aerator (post-deposited separator 2
1) is removed, and the foamed resin plate is provided with a notch so that one end of the first separator does not contact the foamed resin plate.

According to the sixth aspect of the present invention, since the foamed resin plate and the second separator disposed so as to penetrate the second concrete structure are removed, the second separator and the foamed resin plate are removed. Contact is avoided and no fricative noise is produced. In addition, since the cutout portion is provided in the foamed resin plate, one end of the first separator projecting toward the foamed resin plate does not come into contact with the foamed resin plate. Friction noise can be eliminated.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail. First, the structure of a portion to which the expansion joint method of the present invention is applied will be described. As shown in FIG. 1, a first concrete structure (hereinafter, referred to as a first structure) 1 is pre-cast with a second concrete structure (hereinafter, referred to as a second structure). 2) The post-cast concrete 20 is put in parallel with each other at the portion where the second construction is to be made. An expansion joint (hereinafter, referred to as an EJ) 3 is formed between the first structure 1 and the second structure 2.

The width of the EJ portion is such that the first structure 1 and the second structure 2 do not affect each other when the first structure 1 and the second structure 2 expand or contract due to a temperature change or vibrate due to an earthquake or the like. At the same time, the width is such that a styroform 30 (foam resin plate) to be described later is to be arranged.

In the EJ section, a styroform 30 is arranged so as to be sandwiched between the pre-cast concrete 10 and the post-cast concrete 20. Styrofoam 3
As shown in FIG. 2, reference numeral 0 denotes a plate-shaped expanded polystyrene having a thickness to be disposed in the EJ portion 3 and a plurality of substantially circular convex portions 30a provided on one side surface at predetermined intervals. Is provided. This styrofoam 30 is EJ part 3
In the state in which the projections 3 are provided, as shown in FIG.
The side having 0a is directed toward and comes into contact with the precast concrete 10 side. By arranging the protrusions 30a toward the precast concrete 10 in this manner, the contact area between the precast concrete 10 and the styroform 30 is reduced.

Also, the projection 30a of the styrofoam 30
A cutout portion 30b is provided on the side surface having the following. A cutout separator (separator, second separator) 21 is provided in the cutout portion 30b as described later on a first-run separator 11 (first-run separator, first separator). An attachment portion 31 for connecting and fixing is arranged. Since the attachment portion 31 is a member having a female screw portion (not shown),
A male thread (not shown) at one end of the separator is screwed to the female thread to fix the first-run separator 11 and the second-run separator 21.

The pre-cast separator 11 is a member which maintains the spacing of the formwork used when the pre-cast concrete 10 is cast. One end of the pre-cast separator 11 is on the outside of the pre-cast concrete 10 (on the side adjacent to the EJ section 3). Since it protrudes and has a male screw portion, it is in a state of being screwed into the female screw portion of the mounting portion 31 arranged in the cutout portion 30b described above.

On the other hand, the post-placed separator 21 is a member that maintains the mutual spacing of the formwork (the styroform 30 and the weir plate 22) used when placing the post-placed concrete 20. One end has a male thread and a styrofoam 3
It is screwed and fixed to the female screw portion of the mounting portion 31 in a state where it enters from the opposite side surface having the 0 convex portion 30 a, and the other end protrudes outside the weir plate 22.

Further, a portion penetrating the post-cast concrete 20 of the post-cast separator 21 is covered with a hollow tube 23, and the diameter of the hollow portion of the hollow tube 23 is slightly larger than the diameter of the post-cast separator 21. The end of the hollow tube 23 that contacts the styroform 30 is bent so as to be pushed outward along the surface that the styroform 30 contacts, so that the poured concrete does not enter this contact portion. I have.

Next, the expansion joint method of the present invention will be described in the order of steps. [Pre-strike process A] Reinforcing bars are laid to form the pre-cast concrete 10, and a formwork is arranged (not shown). In addition, a pre-separated separator 11 is also provided to maintain the interval between the opposing concrete forms, but at least the end protruding from the EJ section has a male thread, so that the outside of the form Then, it is fixed by screwing with a member having a female screw portion. The other end is fixed by some fixing means, and the mutual interval between the precast concrete forms is held by the preload separator 11.

A precast concrete 1 for constructing the first structure 1 in a formwork in which these reinforcing bars are arranged.
0 is cast. After curing and hardening the pre-cast concrete 10, the member having the female screw portion is removed and the mold is dismantled. It should be noted that the above-described pre-separated separator 1
No. 1 is in a state of being buried in the pre-cast concrete 10 without being removed after the pre-cast concrete 10 is cast.

[Resin Arrangement Step B] After the pre-strike step A, the styrofoam 30 is arranged at a position (the above-mentioned EJ section 3) adjacent to the pre-strength concrete 10 in a dry state (after curing and hardening). . The styrofoam 30 has a plurality of convex portions 30a on one side as shown in FIG.
This side face is arranged so as to abut against the pre-cast concrete 10. With this arrangement, the contact area between the precast concrete 10 and the styrofoam 30 can be reduced.

As shown in FIG. 1, a cut-out portion 30b is provided on the surface of the styroform 30 in contact with the precast concrete 10, so that a mounting portion 31 for fixing the separator is arranged. Has become. Since the mounting portion 31 has the female screw portion as described above, the male screw portion at the end of the pre-cast separator 11 protruding from the surface of the pre-cast concrete 10 which comes into contact with the styroform 30 is screwed.

[Post-Casting Step C] After the foamed resin arranging step B, a reinforcing bar for placing the post-cast concrete is arranged on the side opposite to the pre-cast concrete 10 (not shown). After arranging the reinforcing bars, weir plates 22 (forms supporting the post-cast concrete) are arranged at predetermined intervals according to the cover thickness for the post-cast concrete. Also,
In this case, the styroform 30 serves as a formwork for placing the post-cast concrete 20, and a hollow tube 23 is provided between the styroform 30 and the weir plate 22. Then, a post-placed separator 21 having a diameter slightly smaller than that of the hollow portion is inserted through the hollow tube 23. One end of the post-separated separator 21 through which the hollow tube 23 is inserted has a male screw portion, and enters the styroform 30 from the opposite side having the convex portion 30a of the styroform 30, and the female screw portion of the mounting portion 31 And fixed. The other end protrudes outside the weir plate 22 and is fixed by a bolt or the like (not shown).

When viewed in a plan view, the first-separated separator 11 and the second-separated separator 21 are positioned on the same straight line, and the female thread of the mounting portion 31 disposed in the notch 30b of the styroform 30 and the ends of these separators. Are fixed by screwing together with the external thread portion provided at (the attachment portion 31 connects and connects the post-punch separator 21 to the pre-punch separator 11).

As described above, the dam 22 and the post-separator 21 are arranged, and the post-cast concrete 20 is cast between the styroform 30 and the dam 22 (the portion where the second structure 2 is to be constructed). After curing and hardening the post-cast concrete 20, the weir plate 22 is dismantled and the post-cast separator 21 is turned (the screwed state is released).
Remove.

As described above, according to the expansion joint method of the present invention, a plurality of convex portions 30a are provided on the side surface of the styroform 30, and the side surface having the convex portion 30a comes into contact with the first structure 1. Contact area with the precast concrete 10 can be reduced. That is, by reducing the contact area, it is possible to suppress the friction noise in the EJ section 3 due to a temperature difference or the like.

The post-pumped separator 21 is a hollow tube 2
The post-cast concrete 20 is cast in a state where the post-cast concrete 20 is inserted, and after the post-cast concrete 20 is cured and hardened, it is removed, so that contact between the post-cast separator 21 and the styrofoam 30 can be avoided. Therefore, it is possible to eliminate the friction noise generated between the post-separated separator 21 and the styrofoam 30.

Further, the styrofoam 30 has a notch 3
Since 0b is provided, the end of the pre-separated separator 11 is fixed at the mounting part 31 so that it does not come into contact with the styroform 30, and no friction noise occurs between the pre-separated separator 11 and the styroform 30.

The present invention is not limited to the above embodiment, and various improvements and design changes may be made without departing from the gist of the present invention.

[0037]

According to the first aspect of the present invention, a plurality of convex portions are provided on the side surface of the foamed resin plate, and the side surface having the convex portion comes into contact with the first concrete structure. The contact area between the plate and the first concrete structure can be reduced. Therefore, by reducing the contact area of these contact surfaces, it is possible to suppress the friction noise that causes abnormal noise.

According to the second aspect of the present invention, the separator is removed after casting the concrete for constructing the second concrete structure, so that the contact between the separator and the foamed resin plate can be avoided. Therefore, it is possible to eliminate the friction noise generated between the separator and the foamed resin plate.

According to the third aspect of the present invention, since the separator is inserted into the hollow tube, the separator can be easily removed after placing the post-cast concrete.

According to the fourth aspect of the present invention, since the notched portion is provided so that the precast concrete separator does not contact the foamed resin plate, the gap between the precast concrete separator and the foamed resin plate is reduced. No fricative noise occurs.

According to the fifth aspect of the invention, the same effect as the first aspect can be obtained.

According to the sixth aspect of the present invention, contact between the second separator and the foamed resin plate is avoided, and no friction noise is generated. Further, the friction noise between the first separator and the foamed resin plate can be eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an expansion joint according to the present embodiment.

FIG. 2 is a perspective view showing a styrofoam arranged in the expansion joint.

[Explanation of symbols]

Reference Signs List A Pre-casting step B Resin placement step C Post-casting step 1 First concrete structure 2 Second concrete structure 3 Expansion joint 10 Pre-cast concrete 11 Pre-cast separator (pre-cast separator,
First separator) 20 Post-cast concrete 21 Post-cast separator (separator, second separator) 22 Weir plate (Form) 23 Hollow tube 30 Styrofoam (foam resin plate) 30a Convex portion 30b Notch

Claims (6)

[Claims] 1. A pre-casting step for constructing a first concrete structure; a resin disposing step for disposing a foamed resin plate adjacent to the first concrete structure after the pre-casting step; After the disposing step, a post-punching step of constructing a second concrete structure so as to sandwich the foamed resin plate between the first concrete structure and the first concrete structure. An expansion joint method, wherein a plurality of protrusions are provided on a side surface of the resin plate that contacts the first concrete structure. 2. A pre-casting step for constructing a first concrete structure; a resin disposing step for disposing a foamed resin plate adjacent to the first concrete structure after the pre-casting step; After the arranging step, a post-casting step of constructing a second concrete structure so as to sandwich the foamed resin plate between the first concrete structure and the first concrete structure. In the punching step, between the foamed resin plate, while disposing the formwork with an interval for providing a second concrete structure, using a separator to maintain the interval, the foamed resin plate and An expansion joint method, wherein the separator is removed after placing concrete between the mold and the mold. 3. The expansion joint method according to claim 2, wherein a hollow pipe is arranged in a portion where a second concrete structure is to be constructed, and the second concrete is inserted in a state where the separator is inserted into the hollow pipe. An expansion joint method in which concrete is poured into a part where a structure is to be constructed. 4. The expansion joint method according to claim 2 or 3, wherein in the pre-punching step, a pre-punching separator for maintaining an interval of a mold is used, and the pre-punching separator is used in a post-punching step. In order to connect a separator for post-implantation, the separator for pre-implantation is disposed so as to protrude from the first concrete structure toward the foamed resin plate side, and the foamed resin plate has a protrusion of the separator for pre-implantation. An expansion joint method, wherein a notch is provided so that parts do not contact each other. 5. A first concrete structure, a second concrete structure which is constructed in the vicinity of the first concrete structure after the first concrete structure is constructed, and the first concrete structure. An expansion joint structure including a foamed resin plate sandwiched between a structure and a second concrete structure, wherein the foamed resin plate abuts on the first concrete structure. An expansion joint structure, wherein a plurality of convex portions are formed on a side surface. 6. A first concrete structure, a second concrete structure that is constructed in the vicinity of the first concrete structure after the first concrete structure is constructed, and the first concrete structure. An expansion joint structure comprising a foamed resin plate disposed between the structure and the second concrete structure, wherein the space between the formwork when the first concrete structure is constructed One end of the first separator is provided to protrude toward the foamed resin plate side, and at the time of constructing the second concrete structure, the interval of the formwork is maintained, and one end is the first separator. The second separator connected to one end of the foamed resin plate and disposed so as to penetrate the foamed resin plate and the second concrete structure is removed. An expansion joint structure, wherein a notch is provided so that one end of the first separator does not contact the foamed resin plate.