JPH11172786A - Dry pressure bonding method of precast concrete member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry construction method where any filling material such as mortar is completely unnecessary by holding a plate with small unevenness on the surface between pressure bonding surfaces of precast concrete members to be pressure bonded with each other, and tightening the plate with a binding material arranged perpendicular to the pressure bonding surfaces. SOLUTION: A plate 4 on the surface of which a large number of small unevenness are formed, is held between precast concrete members 1, 1 to be pressure bonded against each other, and firmly bound by a binding material 2 arranged perpendicular the pressure bonding surfaces. The uneven plate 4 to be used in the pressure bonding construction method absorbs the irregularity of the pressure bonding surface of the precast concrete member 1, and is an element to perform the complete dry pressure bonding method, and functions as one kind of a linearly-elastic or non-linearly elastic filling material on the pressure bonding surface to mitigate the stress concentration on the pressure bonding surface. After the joining, the reduction of the tension introduced in the binding material 2 is suppressed to a certain degree through the elastic deformation of the unevenness. A dry construction method can be obtained where any filling material such as mortar is completely unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of constructing structures using precast concrete members, and more particularly to a technique for joining precast concrete members to each other by a completely dry crimping method.

[0002]

2. Description of the Related Art Conventionally, as a technique for prefabricating the construction of a reinforced concrete structure, a technique of constructing a structure by joining precast concrete members to each other has been widely practiced. As a technique for joining precast concrete members, in addition to a wet joining method generally used in the past, recently, a crimping joining method (hereinafter, simply referred to as a crimping method) which is almost dry has been adopted and implemented. .

[0003] The wet joining method is a method in which a protruding reinforcing bar is superimposed on the end of a precast concrete member, and concrete is poured into the rebar and solidified and joined. As described in, for example, Japanese Patent Application Laid-Open No. H8-82002 and the like, a crimping method is a method in which a tension steel material is passed through a precast concrete member to be joined, and the joining surface is strongly crimped and joined with the tension steel material. is there. The crimping method is a method premised on friction joining between precast concrete members, and compared to the wet joining method, it has been evaluated as a joining method with higher prefabrication properties, simpler, superior in quality accuracy, widely adopted, It has been implemented.

[0004]

[Problems to be solved by the present invention]
In the gap between the joint surfaces of the precast concrete members,
It can be said that dry bonding is a method such as a method of filling grout or mortar with small shrinkage on site and equalizing the surface pressure of crimping, or a method of applying epoxy resin between the crimping surfaces. There is no situation.

[0005] In the pressure bonding of the precast concrete member, a large surface pressure acts between the pressure bonding surfaces, so that a large stress concentration may occur due to irregularities in the pressure bonding surface of the precast concrete member. As a countermeasure, filling with mortar or the like or application of an epoxy resin is performed. At first glance, the method of applying epoxy resin to the pressure-bonded surface is simple, but it is necessary to finish the joint surface of the concrete member with extremely high precision.

As described above, a completely dry compression bonding method has not been developed. SUMMARY OF THE INVENTION An object of the present invention is to provide a complete dry pressure bonding method that does not require any filler such as mortar or epoxy resin in pressure bonding of precast concrete members.

[0007]

According to a first aspect of the present invention, there is provided a method for dry-pressing a precast concrete member according to the first aspect of the present invention. It is characterized in that a plate material having small irregularities on its surface is sandwiched between the crimping surfaces of the precast concrete members, and is tied with a tying member arranged in a direction perpendicular to the crimping surface.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The dry pressure bonding method for precast concrete members according to the first aspect of the present invention is suitably implemented in the form of a pressure bonding method between precast concrete members. A representative embodiment of the present invention is shown in FIGS. FIG. 1 shows an example in which two precast concretes 1 and 1 to be joined are strongly joined by a plurality of binding materials 2 via a vertical joining surface 3 and pressure-bonded. FIG. 2 shows an example in which two precast concretes 1 and 1 are strongly tied together by a plurality of tying members 2 via a bonding surface 3 including an inclined surface 3a inclined at an appropriate angle with respect to the longitudinal direction, and pressure-bonded. is there.

In both FIGS. 1 and 2, a precast concrete member 1, which is to be press-bonded, and a plate member 4 (hereinafter, referred to as a concavo-convex plate) having a large number of small irregularities formed between the press-bonded surfaces of the members. It is common to strongly tie with the tying member 2 arranged perpendicularly to the crimping surface. FIGS. 1 and 2 show a plurality of precast concrete member units constituting a column or a beam of a structure as a crimping method for completing a column or a beam, or a column or beam joint between precast concrete members corresponding to a column and a beam. 2 shows a basic example of an embodiment implemented as a crimping method performed on a part.

The uneven plate 4 used in the pressure bonding method of the present invention is an element for absorbing irregularities in the pressure bonding surface of the precast concrete member 1 and realizing a completely dry pressure bonding method. That is, the concavo-convex plate 4 acts as a kind of linearly elastic or non-linearly elastic filler on the pressure-bonding surface, and reduces stress concentration due to irregularity of the pressure-bonding surface. Further, even after joining, a decrease in the tension introduced into the binding material 2 due to creep of the concrete (a decrease in the crimping force).
Is also expected to be suppressed (prevented) to some extent by the unevenness of the uneven plate 4 being elastically deformed.

FIGS. 3 and 4 show an example of a specific structure and form of the concave-convex plate 4 which is expected to exert the above-mentioned effects. A circular dome-shaped unevenness 4a (a shape that is concave on one surface side and convex on the other surface side in this example so that FIG. 3B is easy to understand) is easy to manufacture. Alternatively, a concavo-convex plate in which waveforms are formed in a cross shape in two directions at right angles, and various other forms are conceivable. The thickness of the uneven plate 4, the height of the unevenness, the density, and the like can be changed according to the magnitude of the pressing force to be introduced into the binding material 2, and the unevenness can be applied to various joining portions of the precast concrete member. FIGS. 3 and 4 show a steel plate processed product, in which each unevenness 4a is a circular dome shape having a diameter of 25 mm and a depth of about 8 mm, and the center-to-center distance between adjacent unevennesses 4a is formed at a density of about 30 mm. An example is shown.

As the material of the uneven plate 4, a steel plate having unevenness is generally high in practical use as a material sandwiched between the pressure-bonded surfaces of the precast concrete member. Mixed or aramid fiber mixed) can be substituted. That is, any material having an alternative performance to steel can be used.

The above-mentioned binding material 2 is generally called a tensile steel material. As shown in FIG. 1, a PS cable, a PC steel bar, or the like is preferably used for a long-span connection, and a high-strength bolt or the like is preferably used for a relatively short-span connection as shown in FIG. Both ends of the binding material 2 maintain the introduced tension by a known fixing device 5. After introducing tension into the binder 2, a bonding method in which the holes are filled with grout and an unbonding method in which nothing is filled are appropriately selected and performed.

In the case of the present invention, the basic idea is that the above-mentioned uneven plate 4 is implemented as a sandwiching material completely independent from the crimping surface of the precast concrete member 1.
However, depending on the case, it is also carried out with a configuration in which one or both of the precast concrete members are previously mounted on the crimping surfaces.

[0015]

According to the dry pressing method for precast concrete members according to the present invention, the work of joining the precast concrete members to each other becomes simple, and cost reduction and shortening of the construction period can be expected.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a dry pressure bonding method for a precast concrete member according to the present invention.

FIG. 2 is a front view showing another embodiment of a dry pressure bonding method for a precast concrete member according to the present invention.

FIG. 3A is a partial cross-sectional view of an uneven plate, and FIG. 3B is a cross-sectional view showing a relationship with concrete.

FIG. 4 is a partial plan view showing an example of an uneven plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete member 4 Uneven plate 2 Tightening material

Claims (1)

[Claims] 1. A crimping method for a precast concrete member, wherein a plate member having small irregularities on its surface is sandwiched between the crimping surfaces of the precast concrete members to be crimped and joined, and is arranged in a direction perpendicular to the crimping surface. A dry compression bonding method for precast concrete members, characterized in that they are tied together.