JP3101229B2 - Reinforced spacer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar spacer for properly arranging a reinforcing bar at a connecting portion of a precast concrete slab such as a bridge or a road pavement slab.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for bridges using high-strength and highly reliable precast concrete slabs as floor slabs manufactured in well-equipped factories. Precast concrete slabs are ideal for replacing slabs of aging steel bridges, and new bridges meet the demands of shortening the construction period and saving labor.

[0003] This precast concrete slab has the advantage of being manufactured in large quantities at a factory, but has to be limited to a limited size due to transportation regulations, requires connection work after laying, and is integrated. Linking was an issue. Therefore, various shapes of the connection end face and the shape of the connection reinforcement have been proposed, and as an example of the most reliable connection method, a closed-loop joint reinforcement is projected from an opposing precast concrete slab, and the joint reinforcements are mutually connected. In this connection, a connecting means having a loop has been adopted.

An example of a bridge using such a precast concrete slab is shown in FIGS. 8, 9 and 10. FIG. 8 is a perspective view showing two precast concrete slabs 1a, 1b, FIG. 9 is a plan view of many similar precast concrete slabs 1a, 1b, 1c.
FIG. 10 is a side view of FIG. 9. A large number of precast concrete slabs 1a, 1b, 1c,... Laid on the spar 4 are integrated with the adjacent concrete slabs at the connecting portions 3, respectively. As is clear from FIG. 8, the precast concrete slab 1
The semi-loop joint bar 2 protrudes from the joint end surfaces a and 1b, and the semi-loop joint bar 2 is combined with each other at the connecting portion 3 to form a closed loop 5.

FIGS. 6 and 7 are detailed views of the connecting portion, FIG. 6 is a plan view, and FIG. 7 is a sectional view taken along the line AA of FIG. 2 shows a state in which the through-bar 6 is arranged. Thereafter, the joint seal 7 on the bottom surface is applied, and the filling portion is filled with concrete to integrate the connecting portion. However, when the through-bar 6 is inserted, the joint bar 2 is closed.
Is formed, the reinforcing bars cannot be arranged from above the concrete slab, and are inserted from the end of the joint (connection portion) of the precast concrete slab. Further, it is necessary to bind and fix the inserted reinforcing bar 6 at a predetermined design position in the closed loop 5, but the distance W (about 10 cm) between the joint bars 2 shown in FIG. The reinforcing bar on the upper side of the concrete plate among the reinforcing bars 6 can be barely hung and fixed with a jig such as a reinforcing bar with a hook, but the lower reinforcing bar and the central reinforcing bar are accurate. It was difficult to fix to the position, and there was a risk that the position would move during the placement of the filled concrete.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention places a through-bar in a precise design position through a closed loop formed by a joint bar of a joint of a precast concrete slab such as a bridge or a road pavement slab. An object of the present invention is to provide a reinforcing bar spacer which can be arranged, does not need to be tied to a closed loop-shaped joint bar, and does not move the position of the reinforcing bar even when the concrete in the trace is buried. .

[0007]

SUMMARY OF THE INVENTION The present invention has been developed based on the above-mentioned demand, and the reinforcing spacer of the present invention has a connecting portion between a precast concrete plate and an adjacent plate of a precast concrete plate in which a closed loop-shaped joint bar protrudes from a connecting end face. A plate-like body having a profile substantially equal to the cross-sectional shape of the gap, characterized in that it has a gauge for defining an insertion position of a through-bar placed in the closed-loop joint bar.

The spacer may be made of any material as long as it has compatibility with concrete. However, in view of its properties and cost, the spacer is made of plate-like concrete or mortar or steel plate and has a through hole as a positioning gauge. Are preferred. In this case, it is preferable that the through-hole is a tapered hole so that the through-streak can be easily inserted. Further, a molded article obtained by combining the reinforcing bars defining the insertion position of the through rebar disposed within passage tesuji of precast concrete panel projecting from the closed loop-shaped joint rebar connecting end face and the adjacent plate, positioning the gauge If it is a net-like bar where the reinforcing bars are fixed vertically and horizontally by spot welding etc., it can be manufactured at low cost, and a hook is formed at the upper end of the vertical bar so that it can be locked to the loop bar. This is preferable because the installation of the reinforcing bar spacer is simple and accurate, and the difficulty in inserting the reinforcing bar is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. As an embodiment, an example in which the present invention is used for the connecting portion shown in FIGS. 6 and 7 will be described. The specifications of this example are precast concrete slab length 10m, width 2m, thickness 25c.
m, the joint fill interval 30 cm, joint diameter 19
mm, the spacing between joint muscles was W = 10 cm, and the spacing when adjacent joint muscles were combined and arranged was S = 5 cm.

FIGS. 1 and 2 show a first embodiment. FIG. 1 is a side view showing a state in which a spacer 10 made of a concrete block is installed in a gap between connecting portions 3 of prestressed concrete plates 1a and 1b. It is a perspective view of the concrete block spacer 10. This block spacer 10
It is a plate-like body having a profile 14 substantially equal to the gap of the connecting portion of the precast concrete slab, and is a concrete block spacer provided with positioning holes 11 and positioning grooves 12 for through-bars. The thickness was 40 mm, and the diameter of the positioning holes 11 was 40 mm. The positioning holes may be trumpet-shaped or tapered. The notch 13 contributes to the solid filling of the buried concrete.

For the installation of the spacers, precast concrete slabs are laid, and joint bars are combined in a loop shape, and then about 6 to 8 spacers are dropped into the gap of the connecting portion at an appropriate interval. As shown in FIG. 1, the spacer is engaged with the jaw in the gap between the connecting portions of the precast concrete slab, and the positioning holes 11 and the positioning grooves 12 secure the positions where the reinforcing bars 6 are provided. After that, insert the reinforcing bar 6 through the width direction end face,
By successively passing through the positioning holes 11 and the positioning grooves 12 of the spacer 10, the arrangement of the correctly positioned through-bar 6 is completed without the necessity of binding and fixing to the joint bar 2 or the like. Since the spacer 10 is made of concrete, the spacer 10 is integrated with the embedded concrete.

FIGS. 3 to 5 show a second embodiment.
FIG. 3 is a front view in which spacers 20 combined with reinforcing bars are arranged in the connecting portions 3 of the precast concrete slabs 1a and 1b,
FIG. 4 is a front view of the spacer 20 combined with a reinforcing bar, and FIG. 5 is a side view thereof. This spacer 20 is formed of a reinforcing bar. A bar 21 for securing a predetermined height and a lateral position is welded or bent, and a hook 22 for engaging with the joint bar 2 is formed. The method of use is to hook the hook 22 to the joint bar 2 at a desired position in the connecting portion 3 of the precast concrete slabs 1a and 1b as in the first embodiment,
The through-bar 6 is inserted and buried in the buried concrete.

In the above embodiment, the spacer made of concrete or reinforcing steel is exemplified. However, the present invention is not limited to this, and positioning holes, positioning bars and the like for defining the positions of a plurality of through reinforcing bars are formed in advance. Alternatively, an integral spacer in which a positioning pipe having a length of several centimeters or the like is attached by welding or the like may be used. Such a spacer does not require a work such as bundling or the like, and may be a spacer in which the reinforcing bar does not move even by the concrete placing operation, and is not limited to the above-described material and shape. For example, it goes without saying that a mortar block spacer, a steel plate spacer, a ceramic spacer, or a plastic spacer may be used.

In the above example, a floor slab of a bridge has been described. However, the present invention is not limited to this, and the present invention can be applied to a floor of a building, a pavement slab, and the like.

[0015]

According to the spacer of the present invention, a through-bar in a narrow closed loop is disposed at a predetermined design position simply by dropping it into the space between the joint bars of the precast concrete slab or by suspending the joint bar. It becomes possible to fix, it is not necessary to tie, and it is possible to save labor.

[Brief description of the drawings]

FIG. 1 is a front view showing an arrangement of spacers according to an embodiment.

FIG. 2 is a perspective view of a spacer according to the embodiment.

FIG. 3 is a front view showing an arrangement of spacers according to the embodiment.

FIG. 4 is a front view of the spacer of the embodiment.

FIG. 5 is a side view of the spacer of the embodiment.

FIG. 6 is a plan view of a joint of a precast concrete slab.

FIG. 7 is a front view of a joint of a precast concrete slab.

FIG. 8 is a perspective view showing connection of a precast concrete slab.

FIG. 9 is a plan view showing the connection of the precast concrete slab.

FIG. 10 is a front view showing the connection of a precast concrete slab.

[Explanation of symbols]

1, 1a, 1b, 1c,... Precast concrete plate 2 joint iron metal (joint reinforcing bar) (semi-loop shape) 3 connecting part 4 girder 5 closed loop 6 through reinforcing bar 7 joint seal 10 spacer 11 positioning hole 12 positioning groove 13 notch 14 profile 20 Spacer 21 Crosspiece 22 Hook

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04B 1/60 503 E04B 5/02

Claims (3)

(57) [Claims] 1. A plate-like body having a profile substantially equal to a cross-sectional shape of a connection gap between an adjacent slab and a precast concrete slab having a closed-loop joint reinforcing bar protruding from a connection end face thereof, wherein the closed-loop joint is provided. A reinforcing bar spacer having a gauge for defining an insertion position of a through reinforcing bar provided in the reinforcing bar. 2. A rebar spacer of claim 1, wherein the positioning gauge scan pacer is a concrete or mortar made or steel plate is a through hole. 3. A molded article obtained by combining the reinforcing bars defining the insertion position of the through rebar disposed in precast concrete panel the closed-loop joint reinforcement projecting from the connecting end face and the joint muscles adjacent plate A reinforcing bar spacer, characterized in that the positioning gauge is a reinforcing bar.