JPS6164934A - Connection of concrete member - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for connecting concrete members used for sewers, including box culverts.

(Prior art) When using PC steel rods to connect concrete members, usually several members are lined up, the steel rods are inserted through them, and the steel rods are connected using couplers, and then the steel rods are tensioned to integrate the members. The method will be adopted.

When connecting steel rods under tension, the steel rods may become misaligned due to an error between the sheath and the steel rod, making it difficult to connect them with a coupler. Steel rod ・7
- In the method of connecting through steel rods, it is difficult to align the axes of the steel rods, and accuracy is generally required in the manufacture of the members.

Furthermore, when several members are connected by a single steel rod, the degree of freedom of each member decreases, making it impossible to resist large uneven settlements.

Therefore, a method has been devised to deal with the misalignment of the steel rod by providing a connecting portion within the member and connecting with a coupler there. This is to accommodate not only the error between the base and the steel rod, but also the mismatch of the axes of the steel rod due to uneven settlement, but it does not allow for a large margin when connecting the members.

This invention was made for the purpose of eliminating the difficulty of work caused by mismatching of the axes of steel bars and resisting obstacles such as uneven settlement. The aim is to respond to changes in

(Means for solving the problem) In this construction method, PC steel rods are arranged within each member so that adjacent members can be connected.

The connection is made by a coupler that can be adjusted by one angle for each member, so that it is possible to deal with cases where misalignment of the axes occurs or when installing at an angle.

(Example) This method of connecting concrete members will be described below as an example based on a drawing showing a box culvert.

The concrete member 1 is an OPCPC steel rod 2 manufactured by arranging a PC steel rod 2 slightly shorter than the member length at each corner of the inner circumference of the member.
Use the one that has been unbonded.

In the member 1, a connecting portion 3 is provided by cutting out both ends of a steel rod for attaching the coupler.

The load receiving surface 4a of the coupler 4 is machined into a curved shape, and the surface of the washer 5 in contact with this is similarly machined so as to be pivotally connected to the coupler. Its shape is preferably cylindrical or spherical. It is preferable that the steel rod insertion hole 4b of the coupler be opened larger than the diameter of the steel rod, and particularly narrow on the washer side and shaped like a truncated cone.

Next, the construction procedure will be explained based on FIG. 2.

After laying the concrete member 1-1 manufactured as described above at a predetermined position, the steel bar end 2a on the already laid side and the steel bar end 2b of the already laid member 1-0 are tied together in the coupler 4. Then, connect the parts. Next, the steel rod 2b on the side in the direction in which the laying progresses is tightened and temporarily fixed to the connecting part side wall 3a with a Nantes. This steel rod end 2b is passed through the coupler insertion hole 4b, and the steel rod end 2a of the adjacent member 1-2 is also passed through the same coupler from the opposite side and tightened together with nuts to connect the members. Furthermore, the other end 2b of the steel rod is fixed to the connecting part side wall 3a under tension, and then the steel rod end 2a of the installed member is
Insert it into the coupler and tighten it. Repeat this procedure to connect the parts.

(Effects of the invention) In this construction method, PC steel bars are buried in individual members, and a coupler that can adjust the angle is used for connection, so even if misalignment of the axes occurs during installation, this will not be a problem. , it can fully cope with uneven subsidence. In other words, the load receiver of the coupler has a flat or curved shape, and the insertion hole is large, so that the connection between the members is balanced.

However, if the laying surface of the members is made trapezoidal, for example, as shown in FIG. 7, the members can be laid at any angle to each other, providing flexibility in construction. Layers can be installed to suit the conditions of the topography.

[Brief explanation of drawings]

FIG. 1 is a front view of the concrete member, and FIG. 2 is a cross-sectional view showing its connected state. FIGS. 3 and 4 are enlarged views of the connecting portion, and are a plan view and a vertical sectional view of the load receiver of the coupler having a cylindrical surface. FIGS. 5 and 6 are a plan view and a longitudinal cross-sectional view of a coupler having a spherical shape. FIG. 7 is a cross-sectional view showing a state in which the members are connected at an angle. 1: Concrete member, 2: PC steel bar, 3: Connection part, 4
: Coupler, 5: Washer. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] After placing a PC steel rod shorter than the length of the member at each corner of the inner periphery and laying a concrete member with connecting parts at both ends of the steel rod in the specified position, tension the steel rod on the side in the direction of progress of laying. At the connecting part, the tip is fixed with a nut, and then this tip and the end of the steel rod of the member installed adjacent to the connecting part are fixed with a nut in a coupler with a curved load-receiving surface and a large insertion hole. A method of connecting concrete members in which a large number of concrete members are connected by repeating the steps of tightening the steel rod, tightening the other end of the steel rod, fixing it with a nut, and laying the next member.