JPH031923Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field of the invention> The present invention relates to a connection structure for precast reinforced concrete members, which connects precast reinforced concrete members such as wall panels and ceiling panels, or connects them to foundation concrete. It is.

[Prior art]

As a type of prefabricated building, buildings with a precast reinforced concrete structure, in which walls, ceiling panels, slabs, etc. made of reinforced concrete precast in a factory are joined on site, are widely used.

Figures 1 to 3 are cross-sectional views showing the joints of conventional buildings of this type; Figure 1 is a cross-sectional view of the joint between wall plates and foundation concrete using sleeves; 3 is a cross-sectional view of the joint between the wall plate and the foundation concrete without using a sleeve, and FIG. 3 is a cross-sectional view AA of FIG. 2. In FIG. 1, a foundation concrete 1 is provided at the site, in which foundation bolts 2 are buried and hollow tapered tubular sleeves 3 are buried in advance. On top of this foundation concrete 1 is a precast reinforced concrete wall plate 4 manufactured at the factory.
are stacked on top of each other and are buried in advance at the time of manufacture.
The main reinforcement 5 protruding from the sleeve 3 is inserted into the sleeve 3 and connected to the foundation bolt 2. A high-strength mortar 6 is filled around the main reinforcing bars 5 and the foundation bolts 2 in the sleeve 3. The main reinforcing bars 5 and the foundation bolts 2 are of irregular shape with a bulge on the outer periphery so as to provide resistance to adhesion to concrete. As the mortar 6 hardens, the wall plate 4 and the foundation concrete 1 are joined together.

In addition, in the case shown in Figs. 2 and 3, threaded foundation bolts 8 are buried in the foundation concrete 7 so as to protrude from the foundation surface by a predetermined length, and on the foundation concrete 7, vertical and horizontal main reinforcements are installed. Wall plates 10 made of precast reinforced concrete having 9 are stacked with foundation bolts 8 engaged with tapered bolt holes 11 drilled in advance at a factory. A high-strength mortar 12 is filled around the foundation bolt 8 in the bolt hole 11, and a nut 15 is screwed into the threaded portion of the foundation bolt 8 via washers 13 and 14. And mortar 12
The wall plate 10 and the foundation concrete 7 are joined by hardening and tightening of the nuts 15.

However, in the conventional joint structure constructed as described above, as shown in FIG. It is necessary to take some kind of reinforcing measures to prevent shaking due to the temporary construction work, which not only requires laborious temporary work and prolongs the construction period, but also requires reinforcing materials and expensive sleeves 3, which increases the construction cost. It was hot.

In addition, in the case shown in FIGS. 2 and 3, strong adhesive force between the inner surface of the bolt hole 11 and the mortar 12 cannot be expected, so sufficient rigidity is required to tighten the tensile force generated in the foundation bolt 8. Not only is it necessary to use a thick washer with a strong grip, but also because the main reinforcement 9 and the foundation bolt 8 are not integrated, when an external force such as an earthquake is applied,
There is a possibility that the rib portion of the wall plate 10 having the bolt hole 11 will be destroyed at an early stage. In this respect, the structure shown in FIG. 1 also has the same drawback because the main reinforcing bars 5 and the foundation bolts 2 are not integrated. Furthermore, other joining structures have been proposed, such as joining the main reinforcing bars with a coupler or arc welding, but none of these methods have been able to provide satisfactory strength.

[Summary of the idea]

The present invention was developed in view of the above points, and involves embedding a steel sleeve in a precast reinforced concrete member, which is substantially perpendicular to the joining surface thereof, by welding it to the main reinforcement of the concrete member, and screwing the steel sleeve through the steel sleeve. By connecting the concrete member and its mating member with a member and filling the steel sleeve with high-strength mortar, an extremely strong connection can be achieved in a short construction period without requiring on-site reinforcement measures. The present invention provides a joint structure for precast reinforced concrete members that makes it possible to Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

〔Example〕

Figures 4 to 6 show examples of the joint structure according to the present invention, and Figure 4 shows a second floor wall board implementing this,
FIG. 5 is a sectional view of the floor board and the first floor wall board; FIG. 5 is a sectional view of the wall board and foundation concrete; FIG. 6 is a BB sectional view of FIGS. 4 and 5. In FIGS. 4 and 6, the second floor wall plate 21 precast at the factory includes a plurality of main reinforcements 22, 23 and a main reinforcement 22.
An auxiliary reinforcing bar 22a integrally provided by welding is buried in the side surface of the joint surface 21a, and a cylindrical steel sleeve 24 is buried perpendicular to the joining surface 21a. It is integrated directly with the main reinforcement 23 and indirectly with the other main reinforcement 22 via the auxiliary reinforcement 22a by welding.
When precasting is performed in a factory, the inside of the sleeve 24 is hollow, and a countersink hole 25 is provided in the concrete portion at the opening thereof. Reference numeral 26 denotes a rectangular hole that is continuously provided in the wall plate 21 above the sleeve 24. During precasting at the factory, it is hollow and opens on the side of the wall plate 21 as shown in FIG. has been done.

That is, the upper end of the sleeve 24 is connected to this square hole 2.
6 and a countersunk hole 25 at the lower end.

Next, since the wall board 27 on the first floor is symmetrical with the wall board 21 on the second floor and has exactly the same structure, it will be given the same reference numeral and its explanation will be omitted. Note that the joint surface of the wall plate 27 is designated by the reference numeral 27a. Further, a steel sleeve 29 is embedded in the floor plate 28 precast at the factory, and when precast at the factory, the inside of the sleeve 29 is hollow and opens to the upper and lower joining surfaces 28a and 28b.

The upper and lower wall plates 21, 27 and the floor plate 28 are stacked with sleeves 24, 29 concentrically placed, and bolts 30 are passed through the sleeves 24, 29, with threaded portions at both ends that engage the square holes 26. A nut 32 is screwed together with a washer 31 interposed therebetween. Furthermore, high-strength mortar 33 with good fluidity is filled inside the sleeves 24, 29 and the countersunk hole 25, surrounding the bolt 30 from the upper square hole 26. Further, the square hole 26 is also filled with mortar or concrete 34. 35 is a locking member that prevents the bolt 30 from falling during assembly;
0 and supported by a sleeve 29.
Note that in order to obtain resistance to adhesion to the mortar 33, grooves with a depth of about 1 mm are provided on the inner circumferential surfaces of the sleeves 24 and 29, and the bolts 30 are irregularly shaped bolts with a recessed outer circumference. ing.

Next, the joint structure between the wall plate and the foundation concrete will be explained based on FIGS. 5 and 6. The structure of the wall plate 36 precast at the factory is the same as that of the wall plate 21,
Since it is exactly the same as No. 27, it will be given the same reference numeral and its explanation will be omitted. And foundation concrete 3
7, an anchor bolt 38 is erected at the same time as the foundation work, and this anchor bolt 38 is attached to the sleeve 2.
4, and a nut 32 is screwed into the threaded portion of the nut 32 with a washer 31 interposed therebetween. Mortar 33, 34
The filling is the same as that shown in FIG.

A construction method for the bonded structure configured as described above will be explained. In the factory, wall plates 21, 27, 3
6 and the floor plate 28 are manufactured by precasting, and in this case, the insides of the sleeves 24, 29, the countersunk hole 25, and the square hole 26 are hollow.
Additionally, foundation concrete work 37 is being constructed at the site, and anchor bolts 38 are being erected at the same time. When building the wall plate 36 on the foundation concrete 37, place the wall plate 36 on the foundation concrete 37 while engaging the sleeve 24 with the anchor bolt 38, and temporarily tighten the nuts 32 by inserting a wrench into the square hole 36. do. All wall boards 36
After temporarily assembling the nuts 32, a high-strength mortar 33 with good fluidity is poured into the sleeve 24 through the square hole 34, and the sleeve 24 and countersunk hole 25 are assembled.
Fill inside. After filling, the nuts 32 are tightened and the square holes 26 are backfilled with mortar or concrete 34, thereby completing the structure of the wall board 36.

Next, when assembling the wall plates 21, 27 and the floor plate 28 shown in FIG.
5 and the square hole 26 are left hollow. Then, as explained based on FIG. 5, after fixing the first floor wall plate 27 to the foundation concrete, the floor plate 2
8 and drop the bolt 30 into the sleeves 28 and 24, the bolt 30 will have its threaded part inserted into the lower square hole 2.
6, the locking member 35 prevents it from falling. Therefore, when the wall board 21 on the second floor is erected on the floor board 28 while the sleeve 24 is engaged with the bolt 30, the upper threaded part of the bolt 30 is inserted into the square hole 28.
Since it protrudes inward, the upper nut 32 is temporarily tightened and the lower nut 32 is fully tightened. After temporarily assembling all the wall plates 21 in this way, loosen the upper nuts 32 and pour high-strength mortar 33 with good fluidity into the sleeve 24 through the square hole 26, and from the upper sleeve 24 to the lower washer 31. Fill the space. After filling, the upper nut 32
The construction of the two-story outer wall is completed by tightening the holes 26 and backfilling the upper and lower square holes 26 with mortar or concrete 34.

In addition, in FIGS. 4 and 5, the mortar 33 is poured into the sleeve 2 without loosening the nut 32.
4 may be provided with an injection port on the side surface of the upper end, and injection may be made from there.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the joint structure of precast reinforced concrete members, a steel sleeve is welded to the main reinforcing bars of the concrete member and buried in the precast reinforced concrete member so as to be substantially orthogonal to the joining surface of the precast reinforced concrete member. Fastening the concrete member and its counterpart member with a screw member penetrating the steel sleeve,
By filling the steel sleeve with high-strength mortar, the main reinforcing bars of the precast reinforced concrete members to be joined and the joining bolts between this concrete member and other members can be placed inside the sleeve with sufficient anchorage length. Since they are integrated by adhesion, the rigidity of the joint can be ensured, and
Stress transmission between members becomes smoother and the structure becomes more stable.
In addition, since it is temporarily assembled with bolts, etc., and then filled with high-strength mortar and integrated, there is no need for reinforcing measures before or after filling the mortar, which simplifies the work and shortens the construction period. , construction costs are reduced because reinforcing materials and thick washers for tightening bolts are not required.

[Brief explanation of the drawing]

Figures 1 to 3 show the conventional connection structure of precast reinforced concrete members.
The figure is a cross-sectional view of the joint between the wall plate and the foundation concrete using a sleeve, Figure 2 is a cross-section of the joint between the wall plate and the foundation concrete without a sleeve, and Figure 3 is the AA section of Figure 2. 4 to 6 show examples of the joint structure of precast reinforced concrete members according to the present invention, and FIG.
The figure is also a cross-sectional view of the wall plate and foundation concrete,
FIG. 6 is a BB sectional view of FIGS. 4 and 5. 21, 27, 36...Wall plate, 21a, 27a,
28a... Connection surface, 23... Main reinforcement, 24, 29...
...Sleeve, 28...Floor plate, 30...Bolt, 3
1... washer, 32... nut, 33... mortar, 38... anchor bolt.

Claims (1)

[Scope of utility model registration request] A steel sleeve is welded to the main reinforcement and buried in the precast reinforced concrete member having the main reinforcement so as to be orthogonal to the joining surface thereof, and the precast reinforced concrete member and the mating member are connected by a screw member passing through the steel sleeve. At the same time, the steel sleeve is filled with high-strength mortar, and one end of the steel sleeve is opened on the joining surface side, and the other end is opened in a hole opened in the surface of the precast reinforced concrete member. The precast reinforced concrete member is fastened to the mating member by screwing a nut through a washer with the threaded portion of the screw member facing into the hole.