JPH01239246A - Construction method for broken joint type masonry and spacer for longitudinal or transverse reinforcing bar used therein - Google Patents

Abstract

PURPOSE:To enhance the close contact of a cross bar and maintain the covering depth of a longitudinal bar by inserting the longitudinal bar equipped with longitudinal bar spacers at intervals mating with the cross bars into the cavity from the top of units stacked with cross bars interposed. CONSTITUTION:Masonry units 1 are placed side by side on a base, and cross bar spacers 4 are mounted on each unit 1, and a cross bar 6 is supported and fixed thereon. This procedure is repeated for each cross bar 6 on each stage, and the units 1 are stacked for one layer in the form of broken joint, and a longitudinal bar 9 equipped with longitudinal bar spacers 10 having leg at intervals mating with the cross bars is inserted in the cavity from the top of the stacked units 1. The cavity of the units 1 is filled with concrete or mortar. Thereby the cross bars 6 can be in close contact side by side in the cavity of units 1, and the covering depth of the longitudinal bars 9 with the inside surfaces of the cavity, which should accomplish a structure in sturdy masonry.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a tear-joint type & 11-ply construction method and spacers for vertical and horizontal reinforcing bars used in this construction method.

(Prior Art) Masonry has excellent durability, fire resistance, sound insulation, and heat insulation properties, and has been used worldwide as a construction method since ancient times. However, in Japan, there are some places that lack earthquake resistance, so the structure must be reinforced with steel bars due to legal regulations. Therefore, a structure is created in which cavities are created vertically and horizontally in concrete blocks, bricks, etc. (hereinafter referred to as masonry units), reinforcing bars are placed in the cavities, and mortar or concrete is filled in the cavities, which are then integrated with the masonry unit to obtain earthquake resistance. There is a need to.

In that case, there are two ways to lay the masonry units: the broken joint method (commonly known as brickwork) (Fig. 1a), in which the horizontal joints are laid in a straight line and the vertical joints are staggered for each unit, and the other is in which the vertical joints are laid in a straight line. There is a method of threading (Imo-joint method) (Figure 1b). The tear-joint method is a traditional method of stacking, which gives it an elegant appearance, and because the concentrated load P in the vertical direction is dispersed downward,
This is advantageous because uneven settlement of the foundation is less likely to occur, but in this case, the masonry units are stacked one by one, and the horizontal reinforcement is passed through the space inside the masonry unit, and the horizontal reinforcement is stacked from the top of the wall into the vertical cavity. Vertical reinforcements must be inserted and brought down to the lowest masonry unit. However, in the cavity of each stacked masonry unit, the vertical reinforcements cannot be bound to the horizontal reinforcements, so the vertical reinforcements contact the hole walls and it is not possible to ensure the covering thickness of the reinforcing bars. In general, reinforcing bars require a cover thickness of 1.25 times the coarse aggregate diameter and 20 mm or more between the inner surface of the cavity of the masonry unit for both strength and durability reasons. Inserting reinforcing bars using this method does not meet this condition, so we have no choice but to build by embedding vertical bars in the foundation first, and then use the potato joint method of stacking the masonry units in between. is the current situation. This potato-joint method of piling has the disadvantage that it lacks an elegant appearance and is prone to uneven settling of the foundation. As described above, the reason why reinforced masonry construction has not become widespread in Japan is thought to be largely due to the fact that it cannot be easily constructed using the tear-joint method.

Reinforced masonry construction can accommodate narrow urban sites, the broken-joint construction has an elegant appearance, and is an earthquake- and fire-resistant construction method with excellent sound and heat insulation properties. It is truly a waste that it is not adopted in this day and age.

(Objective of the Invention) Therefore, an object of the present invention is to create cracks that allow vertical reinforcements to be brought into close contact with each other horizontally within the cavity of stacked masonry units, and to ensure that the vertical reinforcements overlap with the inner surface of the cavity. The object of the present invention is to provide a construction method of earth-based masonry construction and a spacer for use in this construction method.

(Structure of the Invention) In order to achieve the above object, according to the present invention, masonry units are arranged horizontally on a foundation, a transverse reinforcement spacer is attached on top of the masonry unit, and the transverse reinforcement is placed at a predetermined position by the transverse reinforcement spacer. After repeating this process for each level of horizontal reinforcement to stack the masonry unit one layer in a tear-joint manner, install vertical reinforcement spacers at the intervals of the horizontal reinforcement and attach vertical reinforcement to the stacked assembly. It can be inserted into the cavity from the top of the masonry unit, brought into close contact with the transverse reinforcement with the help of longitudinal reinforcement spacers, and then the cavity of the masonry unit is filled with concrete or mortar.

In addition, the spacer used in the construction method of the present invention consists of a horizontal strip spacer and a vertical strip spacer, and the horizontal strip spacer is
consisting of bifurcated legs on both sides spanning the web shell of the masonry unit, and a transverse reinforcement support part connecting the legs on both sides and having at least one recess that engages with the transversal reinforcement,
The longitudinal strip spacer includes a longitudinal strip engaging portion having a recess that engages with the longitudinal strip, and a leg portion extending outward and diagonally downward from the longitudinal strip engaging portion.

(Effects of the Invention) In the masonry construction method of the present invention, the spacer is used as described above to perform tear-joint masonry construction, so even though it is a tear-joint method, it is difficult to assemble after masonry. By inserting the vertical reinforcement into the cavity from the top of the multilayer unit, it is possible to bring the horizontal reinforcement and the vertical reinforcement into close contact with each other, and to ensure that they overlap with the inner surface of the cavity.

Also, the transverse bar spacer of the present invention can be attached by its legs to the web shell of the masonry unit to support the transverse bar in the correct position, while the longitudinal bar spacer can be attached to the web shell of the masonry unit by its legs, while the longitudinal bar spacer can be attached within the cavity of the stacked masonry unit. When inserted, the legs that extend diagonally downward make it possible to draw the vertical bars into close contact with the horizontal bars that have already been fixed, and the tips of the legs cover the inner surface of the cavity of the masonry unit in a predetermined manner. thickness can be ensured.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings with regard to an example.

FIG. 2 shows a perspective view of the masonry unit. The masonry unit 1 consists of a face shell 2 forming both side faces and two web shells 3 connecting these face shells.

The structure of a spacer for carrying out the tear joint type masonry construction method according to the present invention using these masonry units 1 will be described. Figure 3.4.5 shows the transversal muscle spacer. This transverse bar spacer 4 has two bifurcated legs 5,5' each of which engages across the web shell 3 of the masonry unit 1, and which connects these legs and receives the transverse bar 6. Transverse reinforcement support part 8 having two recesses 7 for
It consists of.

The longitudinal spacer 10 is shown in FIGS. 6, 7, and 8.

The vertical bar spacer 10 includes a longitudinal bar engaging portion 13 having two arcuate portions 11 and 12 at both ends that engage with the longitudinal bar 9, and a longitudinal bar engaging portion 13 extending outward and diagonally downward from the lower end of the longitudinal bar engaging portion 13. It consists of two legs 14, 14'. The free ends of the legs 14, 14' are bent further downwards, and most of the legs are coated with anti-rust coating. In this embodiment, as is clear from FIG. 9, the vertical bar spacer 10 is made by continuously bending a single reinforcing bar.
3 is made by welding arc-shaped parts 11.12 to both ends of one reinforcing bar, and legs 14.14' are attached to the arc-shaped parts.
can also be welded.

Next, a construction method will be described in which vertical reinforcement and horizontal reinforcement spacer 4.10 of the above structure are used to arrange reinforcement and then pile up masonry units in a tear-joint manner.

In FIG. 10, the mortar 17 is laid on the foundation 16 and the masonry units 1 are stacked horizontally side by side on it, and the bifurcated legs 5.5' of the transverse reinforcement spacer 4 are connected to the masonry units 1. As shown in FIGS. 3 to 5, the web shell 3 is fitted over the upper end of the web shell 3, and the transverse strip 6 is placed in one recess 7 of the transverse strip support portion 8 of the transverse strip spacer 4, and fixed with a binding wire or the like. The position of the recess 7 of the horizontal strip spacer 4 is such that the horizontal strip 6 is located at a distance of more than half the diameter of the vertical strip 10 on either the left or right side from the center line of the wall thickness in each stage, and in the hollow part of the face shell 2. Provide a cover thickness that does not obstruct the passage of coarse aggregate from the inner surface, that is, 1°2 of the coarse aggregate diameter.
It must be determined to be fixed at a position five times or more away. Further, the intervals at which the transverse strip spacers 4 are attached depend on the size of the transverse strips 6, but they are attached at intervals (approximately 800 to 1200 v++) that will prevent the transverse strips 6 from being bent significantly. While repeating this process at each stage,
Stack the masonry units one layer at a time as shown in Figure 1.

Next, the arcuate portion 11 of the vertical strip spacer 10 is attached to the vertical strip 9.
12 and bind it to fix it (6th.
Figure 7). As shown in FIG. 14, the vertical strip spacers 10 are attached to the vertical strips 9 at intervals of several rows of horizontal strips.

If you look into the cavity from the top of the stacked masonry unit 1, you will see that the horizontal bars 6 overlap in a straight line at each level and are slightly eccentric to the width center of the cavity. Slowly insert the vertical muscle 9 with the muscle spacer 10 attached, with the legs 14 and 14' of the vertical muscle spacer 10 pointing toward the wider side opposite to the horizontal muscle 6, and horizontally at a position slightly higher than the predetermined position. Rotate 180 degrees and lower the vertical strip spacer 10 until the tips of the legs 14 and 14' are directly above the horizontal strips 6.

If you let go of your hand when the leg 14.14' hits the horizontal strip 6, the inclined leg 14.14' of the vertical strip spacer 10 will slide down on the horizontal strip 6 due to the weight of the vertical strip 9. , the vertical reinforcement 9 is drawn toward the horizontal reinforcement 6 and comes into close contact with it, and the joints of the deformed reinforcing bars engage and are fixed in both in-plane and out-of-plane directions. At this time, the lower end of the vertical reinforcement is integrated with the insert reinforcement 18 coming up from the foundation. Furthermore, the open legs 14, 14' of the longitudinal strip spacer 10 ensure a minimum cover thickness in the in-plane and out-of-plane directions of the longitudinal strips.

[Brief explanation of the drawing]

Figure 1a is an explanatory diagram showing how to stack masonry units using the tear joint method, Figure 1b is an explanatory diagram showing how the masonry units are stacked using the potato joint method, Figure 2 is a perspective view of the masonry unit, and Figure 3 4 is a side view of the horizontal spacer of the present invention, FIG. 4 is a side view of the horizontal spacer of FIG. 3, FIG. 5 is a plan view of the horizontal spacer of FIG. 3, and FIG. 6 is a front view of the vertical spacer of the present invention. Figure, 7th
The figure is a side view of the vertical bar spacer in Figure 6, Figure 8 is a plan view of the ■ bar spacer in Figure 6, Figure 9 is a perspective view of the vertical bar spacer, and Figure 10 is a masonry building of the present invention. Fig. 11 is a partial cross-sectional view showing the arrangement of horizontal reinforcements and insertion reinforcements in the construction method, and Fig. 11 is a partial cross-section diagram showing the arrangement of vertical reinforcements and horizontal reinforcements arranged using spacers using the tear-joint masonry construction method of the present invention. 12, taken along the line b-b' of FIG.
11 is a sectional view taken along line a-a' in FIG. 11, FIG. 13 is a horizontal sectional view taken along line c-c' in FIG. It is a figure which shows the vertical stripe with which the spacer was attached. 1...Masonry unit 2...Face shell 3...Web shell 4...Transverse bar spacer 5.5'...Bifurcated leg 6...Transverse bar 7...Indentation 8... Horizontal strip support portion 9... Vertical strip 10... Vertical strip spacer 11.12... (Indentation 13... Vertical strip engagement portion 14.14'... Leg portion

Claims (2)

[Claims] (1) Arrange the masonry units horizontally on the foundation, attach the horizontal reinforcement spacer on top of the masonry unit, support and fix the horizontal reinforcement in a predetermined position with the horizontal reinforcement spacer, and repeat this for each level of horizontal reinforcement. After stacking the masonry units in one layer using the tear-joint method, vertical reinforcements with vertical reinforcement spacers attached corresponding to the spacing of the horizontal reinforcements are inserted into the cavity from the top of the stacked masonry units to form the vertical reinforcements. A construction method of tear-joint masonry construction characterized by closely adhering to the horizontal reinforcement with the help of spacers and then filling the cavity of the masonry unit with concrete or mortar. (2) When carrying out the construction method of tear-joint masonry using a masonry unit consisting of face shells that form both sides and web shells that connect these face shells, it is necessary to properly install vertical and horizontal reinforcement bars. In the spacer for arranging reinforcement at a position, the spacer is composed of a horizontal reinforcement spacer and a vertical reinforcement spacer, and the horizontal reinforcement spacer connects bifurcated legs on both sides spanning the web shell of the masonry unit and legs on both sides. The vertical reinforcement spacer includes a horizontal reinforcement support part having at least one recess that engages with the longitudinal reinforcement, and a longitudinal reinforcement support part that has at least one recess that engages with the longitudinal reinforcement, and a longitudinal reinforcement support part that has at least one recess that engages with the longitudinal reinforcement. A spacer characterized by comprising a leg portion extending diagonally downward.