JPH09316995A - Connection method of precast concrete cantilever floor and precast concrete handrail board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely support loads on handrail boards even when mortar is not charged between a cantilever floor and the underface of the handrail board and eliminate welding works for connection and simplify the construction. SOLUTION: Sleeves 3 of box-type containers are buried in a cantilever floor at every specified distance and wide flange shapes 5 are protruded at the lower face of a handrail board 2. The wide flange shape steel 5 has a sectional capacity to support the whole load acting on the handrail board 2. The wide flange shape steel 5 is inserted in the sleeve 3 and a grouting material 8 is charged through grouting holes 7. Post-cast mortar is placed in the clearances of joint faces but as it is not a structural member, only the outer peripheral part may be filled. By use of wide flange shapes 5 with a specified bending strength, the bending stresses or the like of the handrail board 2 can be transmitted without mortar between the handrail board 2 and the cantilever floor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete.

[0002]

2. Description of the Related Art When a handrail plate made of precast concrete is attached to a veranda, corridor, outdoor stairs, etc. of an apartment house, conventionally, a method of connecting a cantilever floor made of precast concrete and a handrail plate by welding or mortar filling The method of connecting the two by using the sleeve joint has been adopted.

FIG. 4 is an explanatory view for explaining the welding method. In the case of this type, the L-shaped steel 22 is buried in the cantilever floor 21 made of precast concrete and the handrail plate made of precast concrete is used. A steel plate 24 was also embedded at the lower end of 23. To join the handrail plate 23, a level adjusting thin plate (not shown) is set at a predetermined position on the cantilever floor 21, the handrail plate 23 is installed, positioned and held by a support. In this way, after the handrail plate 23 is erected at a predetermined position, the steel plate 24 and the L-shaped steel 22 are connected and fixed to each other by welding through the connecting steel plate 26, and then the mortar is attached to the cutout portion 25 and the cantilever floor. Handrail plate 2
The installation work of 3 was completed.

On the other hand, in the case of the sleeve joint system shown in FIG. 5, the joining rebar 32 is projected from the cantilever floor 31 made of precast concrete, and after the floor mortar 37 is provided,
Handrail plate 3 made of precast concrete with joint reinforcement 32
Handrail plate 3 made of precast concrete so that it can be inserted into a steel splice sleeve 34 embedded in 3.
3 was placed, and the inside of the sleeve was filled with non-shrink mortar 35 and connected to the reinforcing bar 36.

In this system, the handrail plate 3 is made up of the joint rebar 32 alone.
It is not a method for supporting the load acting on No. 3 but a method for exerting its supporting force only when the floor mortar 37 is filled between the cantilever floor 31 and the lower surface of the handrail plate 33 without a gap.

Therefore, according to this method, the floor mortar 37 needs to be filled without a gap between the cantilever floor 31 and the lower surface of the handrail plate 33, and the floor mortar 37 is laid before the handrail plate 33 is placed. After completing the placement, a method of further filling the mortar further from the side surface is generally performed at a portion where the filling of the floor mortar is insufficient.

[0007]

However, it is a difficult task to completely fill the gap with the floor mortar and the back-filled mortar. Therefore, the structure for reliably transmitting the bending moment of the handrail plate to the cantilever floor. Sufficient quality control was necessary to realize the conventional bonding method.

Further, in the case of the welding method, a notch for welding work is required, and mortar must be filled after welding, so that a series of joining work is troublesome, and a special work called a welder is required. There was a drawback.

In the case of the sleeve joint system,
There is a drawback that the splice sleeve has a special structure and is an expensive member.

Therefore, as shown in FIG. 6, the handrail plate 43
After the H-shaped steel 44 buried in the cantilever floor 41 is inserted and installed in the sleeve 42 buried in the cantilever floor 41, the grout material 45 is filled in the sleeve 42 to fix the H-shaped steel 44, and the handrail plate 43
Can be joined to the cantilever floor 41, and even if the mortar is not filled between the cantilever floor and the lower surface of the handrail plate, the load acting on the handrail plate 43 can be reliably supported, and welding work at the time of joining It becomes possible to simplify the work by eliminating.

By the way, even with this joining method, the handrail plate 43 is used.
Filling caulking material 46 between the cantilever floor 41 and
In the case of the construction method in which the tile 47 is pasted or the finishing material is sprayed on the spot, a scaffold for working is required.

As a construction method which does not require a scaffold, as shown in FIG. 7, a tile 58 is first attached, or a handrail plate 53 on which a finishing material is sprayed first is joined to the cantilever floor 51 to form a cantilever floor. There is one in which the outer side surface of the tip end portion 51a of 51 is covered by the cover portion 53a of the handrail plate 53, but the handrail plate 53 and the cantilever floor 51 are joined together in the same manner as that shown in FIG.
1, the L-shaped steel 52 is embedded, the steel plate 54 is also embedded in the lower end of the handrail plate 53, the handrail plate 53 is erected at a predetermined position, and then the steel plate 54 and the L-shaped steel 52 are connected to each other. It is connected and fixed by welding through 56, and then the notch 55 and the cantilever floor are filled with mortar 57 to finish. Therefore,
As described above, in the case of the welding method, a notch for welding work is required, and mortar filling must be performed after welding, so that a series of joining work is troublesome and a special work called a welder is required. In addition, the welding cost is high, the cost for backfilling the notch 55 for welding is high, and moreover, the backfill portion is prone to defects over time.

For this reason, for example, as shown in FIG. 8, the handrail plate 63 on which the tile 67 is pasted or the finishing material is sprayed first is joined to the cantilever floor 61 to form the cantilever floor 6
1. The outer surface of the tip portion 61a of No. 1 is covered with the handrail plate 63.
In the method of covering with a, H embedded in the handrail plate 63
After the shaped steel 64 is inserted and installed in the sleeve 62 embedded in the cantilever floor 61, the grout material 65 is filled in the sleeve 62 to fix the H-shaped steel 64, and the handrail plate 63 is joined to the cantilever floor 61. Although a method may be considered, the handrail plate 63 becomes thicker by the thickness of the cover portion 63a, and the weight and the cost increase accordingly.

The present invention has been made in view of the above point, and the invention according to claim 1 acts on the handrail plate even when the mortar is not filled between the cantilever floor and the lower surface of the handrail plate. An object of the present invention is to provide a joining method capable of reliably supporting a load and to eliminate welding work at the time of joining to simplify the work.

According to a second aspect of the present invention, in addition to the object of the first aspect, in the case of an outer wall finishing specification of tiling or spraying a finishing material, after mounting the handrail plate on the cantilever floor, the tile is used by using a scaffold. Instead of the method of pasting and spraying finishing materials,
It is an object of the present invention to provide a method of enabling a handrail plate with a tip of tiles or a spray of finish material to be attached to a cantilever floor without a scaffold, and moreover, to join the handrail plates without increasing the thickness of the handrail plate.

[0016]

In order to solve the above problems and to achieve the object, the invention according to claim 1 is a method for joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete, The shaped steel or steel pipe buried in the lower end of the handrail plate is inserted and installed in the sleeve buried in the cantilever floor, and then the grout material is filled into the sleeve to fix the shaped steel or steel pipe, and the handrail The load acting on the plate is supported solely by the shape steel or steel pipe,
It is characterized in that it has a support structure that does not require floor mortar or packed mortar.

As described above, it is necessary that the section steel or the steel pipe has a cross-sectional performance capable of supporting the load (bending moment, shearing force, axial force) acting on the handrail plate. Examples of the section steel include H-section steel, groove section steel, and L-section steel, and examples of the steel tube include square steel tube and circular steel tube.

According to a second aspect of the present invention, in a method for joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete, the handrail plate has a cover portion that covers an outer surface of the tip end portion of the cantilever floor. The shape steel or steel pipe embedded in the lower end of the handrail plate is bent in a direction away from the cover portion, and the shape steel or steel pipe is inserted and installed in the sleeve embedded in the cantilever floor. After that, the grout material was filled in the sleeve to fix the shaped steel or steel pipe, and the load acting on the handrail plate was solely supported by the shaped steel or steel pipe to form a supporting structure that did not require floor mortar or stuffed mortar. It is characterized by that.

As described above, by using the shaped steel or the steel pipe which is bent in the direction away from the cover portion of the handrail plate, the handrail plate on which the tile is first attached or the finishing material is sprayed first is used. The handrail plate can be joined to the cantilever floor by displacing it to the outer surface side of the tip end of the floor, which is also applicable to scaffolding-free construction. Further, the handrail plate can be joined to the cantilever floor without making the handrail plate thick, and the weight of the handrail plate can be reduced, resulting in low cost.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the accompanying drawings. First, the first embodiment is shown in FIGS. FIG. 1 is an explanatory view of a joining method of a cantilever floor made of precast concrete and a handrail plate made of precast concrete, and FIG. 2 is a perspective view of an H-shaped steel and a sleeve.

The cantilever floor 1 is a plate material made of precast concrete, and a handrail board 2 made of precast concrete.
The sleeve 3 is embedded at a predetermined interval in the place where the is installed.
The sleeve 3 is a box-shaped container made by bending and welding a steel plate as shown in FIG. 2, and the anchor bars 4 are welded to both side surfaces thereof.

The handrail plate 2 is also a plate material made of precast concrete, and an H-shaped steel 5 which is a joint member with the cantilever floor is projectingly provided on the lower surface thereof. The H-shaped steel 5 is a structural member, and the load acting on the handrail plate 2, that is, bending moment, shearing force,
It has a cross-sectional performance capable of independently supporting all axial forces. Also,
The H-shaped steel 5 has anchor bars 6, the upper half of the H-shaped steel 5 is embedded in the handrail plate 2, and a grout material injection hole 7 reaching the H-shaped steel 5 is formed in the lower surface of the handrail plate 2.

The H-shaped steel 5 is inserted and installed in the sleeve 3, the handrail plate 2 is set on the cantilever floor 1, and the grout material 8 is filled in the sleeve 3 through the grout material injection hole 7. Thereafter, mortar (not shown) is filled in the gap between the injection hole and the joint surface by backfilling for finishing, and the work of attaching the handrail plate 2 is completed.

Since the mortar used for this finishing is not a structural member, it may be filled only in the outer peripheral portion or may be replaced with another material. In this way, by using the H-shaped steel 5 having a predetermined bending strength and the like, a structure for transmitting bending stress of the handrail plate 2 is realized without applying mortar between the handrail plate 2 and the cantilever floor 1. can do.

Further, in this embodiment, the H type steel 5 is used as the type steel, but a groove type steel or an L type steel can also be used. Further, a steel pipe can be used instead of the shaped steel, and examples of the steel pipe include a square steel pipe and a circular steel pipe.

This shaped steel or steel pipe is required to have a sectional performance capable of supporting the load (bending moment, shearing force, axial force) acting on the handrail plate. In order to satisfy the same cross-sectional performance, a rebar with a very large diameter is required, which is difficult to obtain, and the weight becomes several times.

The comparison is exemplified below. The section modulus Z of the circular section can be obtained by the equation 1.

[0028]

(Equation 1)

Here, d: diameter of round steel.

Taking H-type steel as an example, Example 1 H-100 × 100 × 6 × 8 (Zx = 76.5c
m ³ ... Strong axis section modulus, w = 17.2 kg / m ..
・ Unit length weight) The diameter of round steel with the same section modulus is d = 92.0m
m, w = 52.2 kg / m. Example 2 H-100 × 50 × 5 × 7 (Zx = 37.5 cm
³ ... Strong axis section modulus, w = 9.30 kg / m ...
The diameter of the round steel with the same section modulus as the unit length weight) is d = 72.6 m
m and w = 32.5 kg / m.

By using the H-shaped steel as the joining structural member in this way, an efficient joining method becomes possible.

Next, a second embodiment of the present invention will be described with reference to FIG.
Shown in FIG. 3 is an explanatory view of a method of joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete. The handrail plate 12 has a cover portion 12a that covers the outer surface of the tip portion 11a of the cantilever floor 11, and the tile 19 is attached to the outer surface and the bottom surface first. The handrail plate 12 may be one in which a finishing material is first sprayed on the outer surface and the bottom surface.

An H-shaped steel 15 having anchor bars 16 is embedded in the handrail plate 12, and the H-shaped steel 15 is covered with the H-shaped steel 12.
What is bent in a direction away from a is used.
After the H-shaped steel 15 is inserted and installed in the sleeve 13 embedded in the cantilever floor 11, the grout material 18 is filled into the sleeve 13 to fix the H-shaped steel 15, and the load acting on the handrail plate 12 is applied to the H-shaped steel 15. It is independently supported by and has a support structure that does not require mortar or padded mortar.

As described above, by using the H-shaped steel 15 which is bent in the direction away from the cover portion of the handrail plate 12, the handrail plate 12 with the tile previously attached is attached to the tip portion 11a of the cantilever floor 11. Can be offset and joined to the outer side,
It can also be used for scaffold-free construction. Further, the handrail plate 12 can be joined to the cantilever floor 11 without making the handrail plate 12 thick, so that the weight of the handrail plate 12 can be reduced and the cost is low.

[0035]

As described above, according to the first aspect of the present invention, the shape steel or the steel pipe capable of supporting the load acting on the handrail plate made of precast concrete is used, and this is fixed by the grout material. Even when the mortar is not filled between the cantilever floor and the lower surface of the handrail plate, the load acting on the handrail plate can be reliably supported. Also,
Since the welding work is eliminated, no notch for welding or backfilling is required, and the connection work can be simplified.

According to the second aspect of the present invention, the shape steel or the steel pipe embedded in the lower end portion of the handrail plate is bent in a direction away from the cover portion of the handrail plate, so that the outer surface or the cantilever plate of the handrail plate is used. If the outer surface of the tip of the floor has an outer wall finish specification with tiled or sprayed finish material, after installing the handrail plate on the cantilever floor, use a scaffold to tile or spray finish material instead of the construction method. It is possible to attach a handrail plate with a tip of tiles or a spray of finishing material onto a cantilever floor without scaffolding. In addition, the handrail plate can be joined to the cantilever floor without increasing the thickness by offsetting and joining the handrail plate to the outer surface side of the tip portion of the cantilever floor, which enables weight reduction of the handrail plate. It is very low cost.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method of joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete showing a first embodiment.

FIG. 2 is a perspective view of an H-section steel and a sleeve.

FIG. 3 is an explanatory view of a method for joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete showing a second embodiment.

FIG. 4 is an explanatory diagram of a conventional welding-type joining method.

FIG. 5 is an explanatory diagram of a conventional sleeve joint type joining method.

FIG. 6 is an explanatory diagram of a joining method for joining a handrail plate with tiles attached in advance to a cantilever floor.

FIG. 7 is an explanatory view of another joining method for joining a handrail plate with tiles attached in advance to a cantilever floor.

FIG. 8 is an explanatory view of still another joining method of joining a handrail plate with tiles attached in advance to a cantilever floor.

[Explanation of symbols]

 1,11 Cantilever floor 2,12 Handrail plate 3,13 Sleeve 5,15 H type steel 8,18 Grout material

Claims (2)

[Claims] 1. A method of joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete, wherein a shaped steel or steel pipe embedded at a lower end portion of the handrail plate is placed in a sleeve embedded in the cantilever floor. After inserting and installing, grout material is filled in the sleeve to fix the shaped steel or steel pipe, and the load acting on the handrail plate is independently supported by the shaped steel or steel pipe, and the supporting structure does not require floor mortar or stuffed mortar. A method for joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete, characterized in that it is configured. 2. A method for joining a cantilever floor made of precast concrete and a handrail plate made of precast concrete, wherein the handrail plate has a cover portion for covering an outer surface of a tip end portion of the cantilever floor, and the handrail plate. Shaped steel or steel pipe embedded in the lower end of the, use the one bent in the direction away from the cover, after inserting this type steel or steel pipe into the sleeve embedded in the cantilever floor, grout material A precast, characterized in that it is filled in a sleeve to fix the shaped steel or steel pipe, and the load acting on the handrail plate is solely supported by the shaped steel or steel pipe, and the supporting structure does not require floor mortar or filled mortar. How to join a cantilever floor made of concrete and a handrail made of precast concrete.