JP2000064551A - Connection structure of concrete member and its connection fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply connect a PC handrail to a PC treadboard at uniform precision by setting the PC handrail on the side of the PC treadboard having landings upward and downward, and screwing bolts from the PC treadboard to the PC handrail. SOLUTION: A PC treadboard 2 in which a fixing box 21 is buried is joined to a PC wall column by bolts inserted in the bolt insertion hole of a tread stage. Next, a PC handrail 3 is set on the side of the PC treadboard 2, and the set interval with the PC treadboard 2 is set by the screw spacer 25 of a fixing plate 22. Next, a joining bolt 23 is screwed to the insert 24 of the PC handrail 3, which is temporarily joined to the PC treadboard 2. In addition, the recess groove of the PC treadboard 2 is filled with shrinkage compensating mortar 28 to bury the fixing box 21. Furthermore, shrinkage compensating mortar 28 is filled between the side of the PC treadboard 2 and the opposite face thereof, and their circumference is sealed with seal materials 29, 29. As the result, the PC handrail 3 can be easily joined to the PC treadboard.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for concrete members and a joint fitting.

[0002]

2. Description of the Related Art Recently, assembling stairs and balconies made of concrete have been assembled from precast concrete members as shown in FIG. 14 because they can be easily constructed. Handrails 36 on these assembled stairs and balconies
The lower stepped portion 37 is fitted and joined to the receiving portion 39 on the stepped plate 38 side, or is joined by the L-shaped connecting member 40.

[0003]

However, the handrail shown in FIG. 14 (1) is troublesome because it requires a mold for forming the step. Further, the handrail (2) in the figure has a problem that since the connecting material is welded on site, uniform accuracy cannot be achieved, and the handrail and the step plate are cracked by the welding heat. Furthermore, the joining of the steps to the wall pillars was a major issue in the assembly stairs.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a joint structure for concrete members which can be easily constructed with uniform accuracy, and a joint fitting.

[0005]

According to the invention of claim 1, a concrete staircase for achieving the above object is characterized in that a precast concrete handrail is bolted to a side surface of a step plate having a landing on the upper and lower sides. And

According to the invention of claim 1, the precast concrete handrail can be easily joined to the step plate.

According to the second aspect of the present invention, the precast concrete handrail is joined to the side surface of the step plate having the landing on the upper and lower sides, the bolt is screwed from the step plate to the precast concrete handrail, and the shear reinforcement provided on the precast concrete handrail. The plate is embedded in the step plate.

According to the second aspect of the present invention, the bolts screwed into the precast concrete handrail from the step plate bear the tensile force for resisting bending stress, and the shear reinforcement plate of the precast concrete handrail bears the shear stress.

According to a third aspect of the present invention, in the second aspect, the shear reinforcing plate is provided with a height adjusting bolt.

According to the invention of claim 3, the mounting height of the precast concrete handrail is adjusted by the height adjusting bolt.

The invention of claim 4 relates to claim 1, 2, 3
In any one of the above, the bolt is screwed into a precast concrete handrail from a fixed box embedded in a step plate, and the fixed box is provided with a screw spacer for adjusting a joining interval with the precast concrete handrail. To do.

According to the fourth aspect of the present invention, when the precast concrete handrail is attached to the step plate, the attachment interval with the step plate can be adjusted by the screw spacer.

The invention of claim 5 is the same as that of claims 1, 2 and
In any one of 3 and 4, cotters are respectively formed on the side surface of the step plate and the precast concrete handrail facing the side surface, and mortar is filled between these cotters.

According to the fifth aspect of the invention, the shearing force is borne by the cotter formed on the step plate and the handrail.

The invention of claim 6 is the same as that of claims 1, 2 and
In any one of 3, 4, and 5, the step board is replaced with a floor board of the balcony.

According to the invention of claim 6, the precast concrete handrail can be easily joined to the floorboard of the balcony.

According to a seventh aspect of the present invention, there is provided a metal fitting for attaching a step plate in an assembly staircase to a wall pillar, the anchor body having a flat rectangular shape with openings at the top and bottom, and concrete injection holes provided on both side plates of the anchor body. An anchor bar extending downwardly from the both side plates, bolt insertion holes provided in the front and back plates of the anchor body, and a bolt protection tube connecting these bolt insertion holes, and the wall surface of the bolt insertion hole. Is a tapered surface.

According to the invention of claim 7, concrete easily flows into the anchor body through the concrete injection holes in both side plates of the anchor body. Moreover, since the wall surface of the bolt insertion hole is a tapered surface, the bolt can be easily inserted.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a joint structure for concrete members according to the present invention will be described below in detail with reference to the drawings. 1 to 3 show a joint structure of a precast concrete handrail and a step plate in an assembly staircase, (1) of FIG. 1 is a perspective view of the precast concrete handrail and the step plate, (2)
Is a cross-sectional view in which a precast concrete handrail is attached to the step plate, FIG. 2 is a plan view in which the precast concrete handrail is attached to the step plate, and FIG. 3 is a side view of the step plate.

The prefabricated concrete stairs (hereinafter referred to as PC stairs) 2, precast concrete handrails (hereinafter referred to as PC handrails) 3, and precast concrete wall columns (hereinafter referred to as PC wall columns) 4 and the like. It will be constructed as an outdoor staircase in an apartment by assembling concrete members on site.

PC step plate 2 used in the above-mentioned assembly stair 1
Has a landing 5 at the top and bottom, is attached to both side surfaces of the PC wall post 4 in different directions, and a PC handrail 3 is joined to the side surface of the PC step plate 2.

When joining the PC handrail 3, the mounting groove 6 is fitted into the PC wall post 4, and the bolt 9 inserted into the bolt insertion hole 8 of the step 7 is screwed into the joining metal fitting 10 of the PC wall post 4. Has been done.

As shown in FIG. 3, the joining metal fitting 10 is
Anchor body 11 having a quadrangular plane with open top and bottom, and a concrete injection hole 1 provided on both side plates 12 of the anchor body 11.
3 and anchor muscles 14 extending downward from the side plates 12
A bolt through hole 17 provided in the front plate 15 and the back plate 16 of the anchor body 11 and a protective tube 18 connecting the bolt through holes 17 to each other.
A work space 19 for tightening the bolt 9 is formed on the rear side of the back plate 16 so as to be buried in a state of being exposed from the side surface of the back plate 16.

When the joining metal fitting 10 is embedded in the PC wall pillar 4, the concrete 2 is inserted into the anchor body 11 through the concrete injection holes 13 in both side plates 12 of the anchor body 11.
0 flows in. The wall surface of the bolt through hole 17 is tapered so that the bolt 9 from the step 7 can be easily inserted into the joint fitting 10.

On the other hand, in the PC handrail 3, as shown in FIGS. 5 to 7, the joining bolts 23 from the fixed box 21 embedded in the PC step plate 2 are screwed into the inserts 24 of the PC handrail 3 so that the PC handrail 3 is inserted. It is joined to the plate 2. Fixed box 2
1 has an open upper surface, and the fixed plate 22 on the front surface is a PC
A screw spacer 25 for setting a joining interval with the handrail 3 is provided, and anchor ribs 26 are welded to the side surface and the bottom surface.

Further, a cotter 27 is provided on each of the PC step plate 2 on which the fixed box 21 is installed and the PC handrail 3, and non-shrink mortar 28 is filled between the cotters 27. It is sealed with a sealing material 29.

A method of joining the PC handrail 3 to the PC step plate 2 will be described below. First, the PC step plate 2 in which the fixing box 21 is embedded is joined to the PC wall column 4 with the bolt 9 inserted into the bolt insertion hole 8 of the step 7. At this time, the non-shrink mortar 2 is placed in the concave groove 30 in which the fixed box 21 is installed.
Since 8 is not filled, the joining bolt 23 on the fixing plate 22 can be operated.

Next, the PC handrail 3 is hoisted by a crane and installed on the side surface of the PC plate 2, and the screw spacer 25 of the fixed plate 22 sets the installation interval with the PC plate 2.
Since this installation interval is determined by the projecting length of the screw spacer 25, the projecting length is made constant in advance.
Finely adjust when installing the C-stage plate 2.

Next, the joining bolt 23 is screwed into the insert 24 of the PC handrail 3 to temporarily join the PC handrail 3 to the PC step plate 2.

Next, the non-shrink mortar 28 is filled in the concave groove 30 of the PC step plate 2 to bury the fixed box 21, and the non-shrink mortar 28 is also provided between the side surface and the facing surface of the PC step plate 2. Are filled and the periphery thereof is sealed with the sealing material 29, whereby the joining of the PC handrail 3 to the PC step plate 2 is completed.

When the PC handrail 3 is permanently joined to the PC step plate 2 in this manner, the joining bolt 23 bears the tensile force resisting the bending stress caused by the rotation of the PC handrail 3, and the cotter 27 applies the shear stress. bear.

8 to 11 show another joining structure of the PC handrail and the PC step plate. The PC handrail 3 is joined to the PC step plate 2 by the joining bolt 23 and the shear reinforcing plate 31. .

The joint bolt 23 is screwed into the insert 24 of the PC handrail 3 from the fixed box 21 in the same manner as described above. Further, as the shear reinforcing plate 31, an L-shaped plate 33 attached to the PC handrail 3 with a bolt 32 is installed in an installation groove 34 of the PC step plate 2 and covered with non-shrink mortar 28.

A height adjusting bolt 35 is attached to the shear reinforcing plate 31.
Is provided, and this sets the installation height with the PC step board 2. Therefore, the joining bolt 23 bears the tensile force that resists the bending stress caused by the rotation of the PC handrail 3, and
The shear reinforcing plate 31 bears shear stress. The joining bolts are provided at four locations and the shear reinforcing plates are provided at two locations, respectively, but the number is not limited to these numbers.

The method of joining the PC handrail and the PC step plate shown in FIG. 8 will be described below. First, the PC step plate 2 having the fixed box 21 installed is joined to the PC wall post 4 by the same method as described above. An installation groove 34 for the shear reinforcing plate 31 is formed on the PC step plate 2 adjacent to the fixed box 21 in the landing 5. On the other hand, the PC handrail 3 has a shear reinforcement plate 3
1 is previously bolted to 32.

Next, the shear reinforcing plate 31 is installed on the side surface of the PC step plate 2 so as to be inserted into the installation groove 34. At this time,
The screw spacer 25 sets the installation interval with the PC step plate 2, and the height adjustment bolt 35 sets the mounting height of the PC handrail 3.

Next, the joining bolt 23 is screwed into the insert 24 of the PC handrail 3 to temporarily join the PC handrail 3 to the PC step plate 2.

Next, the concave groove 30 and the installation groove 34 of the PC step plate 2
The non-shrink mortar 28 is filled with the fixed box 21 and the shear reinforcement plate 31 and the non-shrink mortar 28 is filled between the cotters 27 of the PC step plate 2 and the PC handrail 3 as well. Around the sealing material 29
Then, the PC handrail 3 is joined to the PC step plate 2 and sealed.

Although the present embodiment has been described with respect to the assembly stairs, the connection structure of the PC handrails on the balcony has the same structure as above, and the same connection metal fittings are used to perform the connection (FIG. (Not shown).

[0040]

The PC handrail can be easily joined to the PC step plate.

The shear force can be borne by the cotter formed on the PC step plate and the PC handrail.

When the PC handrail is attached to the PC step plate, the attachment interval with the PC step plate can be adjusted by the screw spacer.

The joining bolt can bear the tensile force that resists bending stress, and the shear reinforcement plate can bear the shear stress.

When the PC handrail is attached to the PC step plate, the installation interval with the PC step plate can be adjusted by the screw spacer.

The height of the PC handrail attached to the PC step plate can be adjusted with the height adjusting bolt.

It is possible to easily join the PC handrail to the floor plate of the balcony.

Since the wall surface of the bolt insertion hole is a tapered surface, the bolt can be easily inserted and the PC step plate can be easily attached to the PC wall pillar.

When burying the joint fitting in the PC wall pillar, concrete can flow into the anchor body from the concrete injection hole.

[Brief description of drawings]

FIG. 1 (1) is a perspective view of an assembly staircase, and FIG. 1 (2) is a sectional view of the same.

FIG. 2 is a plan view of an assembly staircase.

FIG. 3 (1) is a perspective view of a metal fitting, (2) is a side view of the same, and (3) is a sectional view of the same.

4 (1) and (2) are cross-sectional views of a joint portion between a PC wall column and a PC step plate.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a sectional view of a joint portion between a PC handrail and a PC step plate.

FIG. 7 is a sectional view of a joint portion between a PC handrail and a PC step plate.

8 (1) and (2) are sectional views taken along line BB in FIG. 7.

9 is a sectional view taken along line CC of FIG.

FIG. 10 is a side view of another PC step board.

FIG. 11 is a plan view of another assembly staircase.

FIG. 12 is a sectional view of a joint portion between a PC handrail and a PC step plate.

13 is a cross-sectional view taken along the line EE of FIG.

14 (1) and (2) are conventional PC handrails and PCs.
It is sectional drawing of the junction part of a step board.

[Explanation of symbols]

1 assembly stairs 2 PC step board 3 PC handrail 4 PC wall pillar 5 landings 6 mounting groove 7 steps 8 bolt insertion holes 9,32 bolt 10 joining metal fittings 11 anchor body 12 both sides 13 Concrete injection hole 14,26 Anchor muscle 15 front plate 16 backboard 17 bolt through hole 18 Protection tube 19 workspace 20 concrete 21 Fixed box 22 Fixed plate 23 Joint bolt 24 inserts 25 screw spacer 27 cotters 28 Non-shrink mortar 29 Seal material 30 groove 31 Shear reinforcement plate 33 L-shaped plate 34 Installation groove 35 Height adjustment bolt

Claims (7)

[Claims] 1. A joint structure for concrete members, characterized in that precast concrete handrails are joined by bolts to the side surfaces of a step plate having a landing at the top and bottom. 2. A precast concrete handrail is joined to the side surfaces of a step plate having upper and lower landings, bolts are screwed from the step plate to the precast concrete handrail, and a shear reinforcement plate provided on the precast concrete handrail is embedded in the step plate. The joining structure of concrete members characterized by being made. 3. The joint structure for concrete members according to claim 2, wherein the shear reinforcing plate is provided with a height adjusting bolt. 4. The bolt is screwed into a precast concrete handrail from a fixed box embedded in a step plate, and the fixed box is provided with a screw spacer for adjusting a joint interval with the precast concrete handrail. The joint structure for concrete members according to claim 1, 2, or 3. 5. A cotter is formed on each of a side surface of the step plate and a precast concrete handrail facing the side surface, and mortar is filled between the cotters. 3. The concrete member joining structure according to any one of 3, 4 above. 6. The joint structure for a concrete member according to claim 1, wherein the step plate is replaced with a floor plate of a balcony. 7. A metal fitting for attaching a step plate in an assembly staircase to a wall pillar, a flat rectangular anchor body having upper and lower openings, concrete injection holes provided in both side plates of the anchor body, and a downward direction from the both side plates. It consists of an anchor streak extending to the front, bolt insertion holes provided in the front plate and back plate of the anchor body, and a bolt protection tube connecting these bolt insertion holes, and the wall surface of the bolt insertion hole is a tapered surface. A fitting for joining concrete members.