JP3021945U - Reinforcing bar support tool for secondary lining of shield tunnel - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rebar supporting tool for a secondary lining of a shield tunnel capable of restraining and supporting framed rebar by a simple work. [Structure] A support rod 2 is erected on a base member 1 so that the length thereof can be adjusted, and a front end of the support rod 2 has a substantially U-shaped front surface with both side plates 4.
4 is provided with a support member 3 provided with a notch 5 for receiving and locking the reinforcing bar, and the lower reinforcing bar 7 is inserted into the bottom side of the U-shaped portion of the supporting member 1, and the U-shaped both side plates Cutouts 4 and 5
The upper rebar 8 crossing the lower rebar 7 is hooked and supported, and the tip of the support rod 2 is advanced into the support member 3 to press the two rebars 7 and 8 against each other, and the base member 1 It was rotated to adjust the length of the entire supporting tool so that the reinforcing bar was held at a predetermined position between the surface of the shield tunnel T and the temporary frame for secondary lining.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reinforcing bar supporting tool for supporting reinforcing bars when constructing a secondary lining in a shield tunnel.

[0002]

[Prior art]

 The shield tunnel is sometimes used as it is after the tunnel is formed, but in many cases a secondary lining is applied on top of it to make it waterproof and to increase its strength. When constructing such a secondary lining, reinforcing bars are skeletonly intervened therein.

In the shield tunnel, various types of supporting tools for supporting framed reinforcing bars have been proposed and put to practical use in the past, but no sufficiently satisfactory one has yet appeared. That is, in the conventional supporting tool, the suspending bar is attached to the metal fitting installed in the segment, and the suspending bar simply suspends and supports the reinforcing bar from above. However, due to its own weight and the load applied when concrete is placed, it may be displaced forward or backward or left or right, and if so, the reinforcing bar placed earlier may be displaced downward from the center of the lining concrete layer. It will be.

[0004]

[Problems to be solved by the device]

 In view of the above-mentioned conventional techniques, the present invention aims to provide a reinforcing bar supporting tool for a secondary lining of a shield tunnel capable of restraining and supporting a framed reinforcing bar by a simple work. It is what

[0005]

[Means for Solving the Problems]

 The structure of the reinforcing bar supporting tool of the present invention made for the purpose of solving the above-mentioned problem is that a supporting rod is erected on a base member so that the length thereof can be adjusted, and the front end of the supporting rod is substantially U-shaped on both sides. A support member provided with a notch for receiving and locking the reinforcing bar is provided on the upper part of the plate, the lower reinforcing bar is inserted into the bottom side of the U-shaped part of the supporting member, and the U-shaped both side plates are provided with the above-mentioned notches. The upper rebar crossed with the lower rebar is hooked and supported, and the tip of the supporting rod is advanced into the support member so that both rebars are pressed against each other and the base member is rotated to lengthen the entire supporting tool. Is adjusted so that the rebar is held at a predetermined position between the surface of the shield tunnel and the temporary frame for the secondary lining.

According to the present invention, in the supporting tool having the above-mentioned structure, a concave receiving seat that is applied to the reinforcing bar may be provided at the tip of the supporting rod.

[0007]

[Action]

 The reinforcing bar supporting tool of the present invention is a supporting member having a U-shaped front surface and a notch for laterally receiving and locking the reinforcing bar at both ends of a supporting rod vertically erected on the base member. Since it is configured to be attached, the base member is fixed to the temporary frame, and the reinforcing rod of the supporting member is inserted through, for example, the reinforcing bar to be arranged in the length direction of the tunnel, and is arranged in the circumferential direction of the tunnel. By arranging the reinforcing bars in engagement with the notches and adjusting the length of the supporting rods so that the reinforcing bars are pressed against each other, a strong skeleton of the reinforcing bars can be easily formed.

[0008]

【Example】

 Next, an example of implementation of the present invention will be described with reference to the drawings. FIG. 1 is a front sectional view of a main part of a state in which a reinforcing bar is skeletonized using the reinforcing bar supporting tool of the present invention, FIG. 2 is a side sectional view of the same, FIG. 3 is a sectional view taken along the line AA of FIG. 1, and FIG. FIG. 6 is a front cross-sectional view showing a state in which the skeleton is completed, the secondary concrete is placed, and the temporary frame is removed.

In the figure, 1 is a base member, 2 is a support rod that is erected on the base member 1 so as to be adjustable in length. Here, a female screw 1a is provided on the base member 1, and the support rod 2 is the female rod. It is composed of a bolt rod that is screwed onto the screw 1a. Note that 1b is a lock nut. Reference numeral 3 denotes a support member which is fixed to the tip of the support rod 2 and which is attached by screwing in here and which has a substantially U-shaped front face. A notch 5 for locking is formed. Reference numeral 6 is a locking portion of the notch 5. At the upper end of the support rod 2 and on the inner side of the support member 3, there is rotatably mounted a recessed seat 2a that is applied to a reinforcing bar 7 described below from below. Further, the material of the base member 1 in the above may be an appropriate material such as synthetic resin, wood, or metal.

As shown in FIG. 1, the reinforcing bar supporting tool of the present invention constructed as described above is arranged so as to be suspended and supported by the suspending bar provided in each segment of the shield tunnel T. With respect to the iron metal (horizontal bar) 7 and the upper reinforcing bar (arch bar) 8 intersecting with the reinforcing bar 7, first, the lower reinforcing bar 7 is passed through the U-shaped portion of the supporting member 3 to The notch 5 formed on both side plates 4 and 4 is hooked on the upper rebar 7, and the base member 1 is rotated to rotate the support rod 2 with respect to the support member 3, thereby providing a seat provided at the tip of the support rod 2. 2a is brought into contact with the lower surface of the lower rebar 7, and the two crossed rebars 7 and 8 are fixed in pressure contact with each other between the seat 2a and the notch 5. After this fixing, the base member 1 is reversed with respect to the support rod 2 to adjust to a predetermined distance from the reinforcing bars 7 and 8 to the bottom surface of the base member 1, and the loosening nut 1b is tightened to fix the support tool of the present invention. The steel bars 7 and 8 are held in a suspended state. In this state, by setting the temporary frame K by means such as jacking up, the reinforcing bars 7 and 8 crossed by the supporting tool of the present invention are held at a predetermined position between the segment of the shield tunnel T and the temporary frame K. Will be done.

Therefore, in the reinforcing bar supporting tool of the present invention, the crossed reinforcing bars 7 and 8 arranged for the secondary lining of the shield tunnel T are firmly fixed at a predetermined position between the tunnel T and the temporary frame K. Therefore, even if the secondary concrete C is driven in the state shown in FIGS. 1 and 2, the reinforcing bars 7 and 8 are not displaced due to the weight of the driving concrete, etc. A secondary lining reinforced with reinforcing bars shown in Fig. 3 is formed.

[0012]

[Effect of device]

 The present invention is as described above, and by using the reinforcing bar supporting tool of the present invention, the reinforcing bar frame necessary for the secondary lining of the shield tunnel can be easily and firmly held in place, which is extremely good. A secondary lining can be applied. Further, the reinforcing bar supporting tool of the present invention has a simple structure and can be manufactured and provided at low cost.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view of a main part of a state in which a reinforcing bar is framed using a reinforcing bar supporting tool of the present invention.

FIG. 2 is a side cross-sectional view of a main part of a state in which a reinforcing bar is framed using the reinforcing bar supporting tool of the present invention.

FIG. 3 is a view on arrow AA of FIG.

FIG. 4 is a front cross-sectional view of a state where the frame of the reinforcing bar is completed and the secondary concrete is placed using the reinforcing bar supporting tool of the present invention.

[Explanation of symbols]

 1 member 1a female screw 1b lock nut 2 support rod 2a seat 3 support member 4 side plate of support member 5 notch 6 locking part 7,8 rebar

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinji Takeuchi Inventor Shinji Takezuuchi 3-4-2 Imazu Kita 3-chome, Tsurumi Ward, Osaka City, Osaka Prefecture (72) Inventor Toshio Shimoda Minamitsukaguchi, Amagasaki City, Hyogo Prefecture 3-12-1, Machi In the stock company Izumi

Claims (2)

[Scope of utility model registration request] 1. A support rod is erected on the base member so that its length can be adjusted, and a notch for receiving and locking a reinforcing bar is provided at an upper end of both side plates in a front end of the support rod in a substantially U-shape. A supporting member is provided, the lower reinforcing bar is inserted into the bottom side of the U-shaped portion of the supporting member, and the upper reinforcing bar crossing the lower reinforcing bar is hooked and supported by the notches of the U-shaped both side plates. By advancing the tip of the support rod into the support member, both rebars are pressed into contact with each other, and the base member is rotated to adjust the length of the entire support tool, and the rebar is covered with the shield tunnel surface and the secondary cover. A rebar supporting tool for secondary lining of a shield tunnel, characterized in that it is held at a predetermined position between temporary frames for construction. 2. The rebar supporting tool for the secondary lining of a shield tunnel according to claim 1, wherein a concave receiving seat which is applied to the rebar from below is provided at the tip of the supporting rod.